+++ /dev/null
-/* regcomp.c
- */
-
-/*
- * 'A fair jaw-cracker dwarf-language must be.' --Samwise Gamgee
- *
- * [p.285 of _The Lord of the Rings_, II/iii: "The Ring Goes South"]
- */
-
-/* This file contains functions for compiling a regular expression. See
- * also regexec.c which funnily enough, contains functions for executing
- * a regular expression.
- *
- * This file is also copied at build time to ext/re/re_comp.c, where
- * it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT.
- * This causes the main functions to be compiled under new names and with
- * debugging support added, which makes "use re 'debug'" work.
- */
-
-/* NOTE: this is derived from Henry Spencer's regexp code, and should not
- * confused with the original package (see point 3 below). Thanks, Henry!
- */
-
-/* Additional note: this code is very heavily munged from Henry's version
- * in places. In some spots I've traded clarity for efficiency, so don't
- * blame Henry for some of the lack of readability.
- */
-
-/* The names of the functions have been changed from regcomp and
- * regexec to pregcomp and pregexec in order to avoid conflicts
- * with the POSIX routines of the same names.
-*/
-
-#ifdef PERL_EXT_RE_BUILD
-#include "re_top.h"
-#endif
-
-/*
- * pregcomp and pregexec -- regsub and regerror are not used in perl
- *
- * Copyright (c) 1986 by University of Toronto.
- * Written by Henry Spencer. Not derived from licensed software.
- *
- * Permission is granted to anyone to use this software for any
- * purpose on any computer system, and to redistribute it freely,
- * subject to the following restrictions:
- *
- * 1. The author is not responsible for the consequences of use of
- * this software, no matter how awful, even if they arise
- * from defects in it.
- *
- * 2. The origin of this software must not be misrepresented, either
- * by explicit claim or by omission.
- *
- * 3. Altered versions must be plainly marked as such, and must not
- * be misrepresented as being the original software.
- *
- *
- **** Alterations to Henry's code are...
- ****
- **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- **** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
- **** by Larry Wall and others
- ****
- **** You may distribute under the terms of either the GNU General Public
- **** License or the Artistic License, as specified in the README file.
-
- *
- * Beware that some of this code is subtly aware of the way operator
- * precedence is structured in regular expressions. Serious changes in
- * regular-expression syntax might require a total rethink.
- */
-#include "EXTERN.h"
-#define PERL_IN_REGCOMP_C
-#include "perl.h"
-
-#ifndef PERL_IN_XSUB_RE
-#include "re_defs.h"
-#endif
-
-#define REG_COMP_C
-#ifdef PERL_IN_XSUB_RE
-# include "re_comp.h"
-EXTERN_C const struct regexp_engine my_reg_engine;
-#else
-# include "regcomp.h"
-#endif
-
-#include "dquote_static.c"
-#include "charclass_invlists.h"
-#include "inline_invlist.c"
-#include "unicode_constants.h"
-
-#define HAS_NONLATIN1_FOLD_CLOSURE(i) \
- _HAS_NONLATIN1_FOLD_CLOSURE_ONLY_FOR_USE_BY_REGCOMP_DOT_C_AND_REGEXEC_DOT_C(i)
-#define HAS_NONLATIN1_SIMPLE_FOLD_CLOSURE(i) \
- _HAS_NONLATIN1_SIMPLE_FOLD_CLOSURE_ONLY_FOR_USE_BY_REGCOMP_DOT_C_AND_REGEXEC_DOT_C(i)
-#define IS_NON_FINAL_FOLD(c) _IS_NON_FINAL_FOLD_ONLY_FOR_USE_BY_REGCOMP_DOT_C(c)
-#define IS_IN_SOME_FOLD_L1(c) _IS_IN_SOME_FOLD_ONLY_FOR_USE_BY_REGCOMP_DOT_C(c)
-
-#ifndef STATIC
-#define STATIC static
-#endif
-
-
-struct RExC_state_t {
- U32 flags; /* RXf_* are we folding, multilining? */
- U32 pm_flags; /* PMf_* stuff from the calling PMOP */
- char *precomp; /* uncompiled string. */
- REGEXP *rx_sv; /* The SV that is the regexp. */
- regexp *rx; /* perl core regexp structure */
- regexp_internal *rxi; /* internal data for regexp object
- pprivate field */
- char *start; /* Start of input for compile */
- char *end; /* End of input for compile */
- char *parse; /* Input-scan pointer. */
- SSize_t whilem_seen; /* number of WHILEM in this expr */
- regnode *emit_start; /* Start of emitted-code area */
- regnode *emit_bound; /* First regnode outside of the
- allocated space */
- regnode *emit; /* Code-emit pointer; if = &emit_dummy,
- implies compiling, so don't emit */
- regnode_ssc emit_dummy; /* placeholder for emit to point to;
- large enough for the largest
- non-EXACTish node, so can use it as
- scratch in pass1 */
- I32 naughty; /* How bad is this pattern? */
- I32 sawback; /* Did we see \1, ...? */
- U32 seen;
- SSize_t size; /* Code size. */
- I32 npar; /* Capture buffer count, (OPEN) plus
- one. ("par" 0 is the whole
- pattern)*/
- I32 nestroot; /* root parens we are in - used by
- accept */
- I32 extralen;
- I32 seen_zerolen;
- regnode **open_parens; /* pointers to open parens */
- regnode **close_parens; /* pointers to close parens */
- regnode *opend; /* END node in program */
- I32 utf8; /* whether the pattern is utf8 or not */
- I32 orig_utf8; /* whether the pattern was originally in utf8 */
- /* XXX use this for future optimisation of case
- * where pattern must be upgraded to utf8. */
- I32 uni_semantics; /* If a d charset modifier should use unicode
- rules, even if the pattern is not in
- utf8 */
- HV *paren_names; /* Paren names */
-
- regnode **recurse; /* Recurse regops */
- I32 recurse_count; /* Number of recurse regops */
- U8 *study_chunk_recursed; /* bitmap of which parens we have moved
- through */
- U32 study_chunk_recursed_bytes; /* bytes in bitmap */
- I32 in_lookbehind;
- I32 contains_locale;
- I32 contains_i;
- I32 override_recoding;
- I32 in_multi_char_class;
- struct reg_code_block *code_blocks; /* positions of literal (?{})
- within pattern */
- int num_code_blocks; /* size of code_blocks[] */
- int code_index; /* next code_blocks[] slot */
- SSize_t maxlen; /* mininum possible number of chars in string to match */
-#ifdef ADD_TO_REGEXEC
- char *starttry; /* -Dr: where regtry was called. */
-#define RExC_starttry (pRExC_state->starttry)
-#endif
- SV *runtime_code_qr; /* qr with the runtime code blocks */
-#ifdef DEBUGGING
- const char *lastparse;
- I32 lastnum;
- AV *paren_name_list; /* idx -> name */
-#define RExC_lastparse (pRExC_state->lastparse)
-#define RExC_lastnum (pRExC_state->lastnum)
-#define RExC_paren_name_list (pRExC_state->paren_name_list)
-#endif
-};
-
-#define RExC_flags (pRExC_state->flags)
-#define RExC_pm_flags (pRExC_state->pm_flags)
-#define RExC_precomp (pRExC_state->precomp)
-#define RExC_rx_sv (pRExC_state->rx_sv)
-#define RExC_rx (pRExC_state->rx)
-#define RExC_rxi (pRExC_state->rxi)
-#define RExC_start (pRExC_state->start)
-#define RExC_end (pRExC_state->end)
-#define RExC_parse (pRExC_state->parse)
-#define RExC_whilem_seen (pRExC_state->whilem_seen)
-#ifdef RE_TRACK_PATTERN_OFFSETS
-#define RExC_offsets (pRExC_state->rxi->u.offsets) /* I am not like the
- others */
-#endif
-#define RExC_emit (pRExC_state->emit)
-#define RExC_emit_dummy (pRExC_state->emit_dummy)
-#define RExC_emit_start (pRExC_state->emit_start)
-#define RExC_emit_bound (pRExC_state->emit_bound)
-#define RExC_naughty (pRExC_state->naughty)
-#define RExC_sawback (pRExC_state->sawback)
-#define RExC_seen (pRExC_state->seen)
-#define RExC_size (pRExC_state->size)
-#define RExC_maxlen (pRExC_state->maxlen)
-#define RExC_npar (pRExC_state->npar)
-#define RExC_nestroot (pRExC_state->nestroot)
-#define RExC_extralen (pRExC_state->extralen)
-#define RExC_seen_zerolen (pRExC_state->seen_zerolen)
-#define RExC_utf8 (pRExC_state->utf8)
-#define RExC_uni_semantics (pRExC_state->uni_semantics)
-#define RExC_orig_utf8 (pRExC_state->orig_utf8)
-#define RExC_open_parens (pRExC_state->open_parens)
-#define RExC_close_parens (pRExC_state->close_parens)
-#define RExC_opend (pRExC_state->opend)
-#define RExC_paren_names (pRExC_state->paren_names)
-#define RExC_recurse (pRExC_state->recurse)
-#define RExC_recurse_count (pRExC_state->recurse_count)
-#define RExC_study_chunk_recursed (pRExC_state->study_chunk_recursed)
-#define RExC_study_chunk_recursed_bytes \
- (pRExC_state->study_chunk_recursed_bytes)
-#define RExC_in_lookbehind (pRExC_state->in_lookbehind)
-#define RExC_contains_locale (pRExC_state->contains_locale)
-#define RExC_contains_i (pRExC_state->contains_i)
-#define RExC_override_recoding (pRExC_state->override_recoding)
-#define RExC_in_multi_char_class (pRExC_state->in_multi_char_class)
-
-
-#define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
-#define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
- ((*s) == '{' && regcurly(s)))
-
-/*
- * Flags to be passed up and down.
- */
-#define WORST 0 /* Worst case. */
-#define HASWIDTH 0x01 /* Known to match non-null strings. */
-
-/* Simple enough to be STAR/PLUS operand; in an EXACTish node must be a single
- * character. (There needs to be a case: in the switch statement in regexec.c
- * for any node marked SIMPLE.) Note that this is not the same thing as
- * REGNODE_SIMPLE */
-#define SIMPLE 0x02
-#define SPSTART 0x04 /* Starts with * or + */
-#define POSTPONED 0x08 /* (?1),(?&name), (??{...}) or similar */
-#define TRYAGAIN 0x10 /* Weeded out a declaration. */
-#define RESTART_UTF8 0x20 /* Restart, need to calcuate sizes as UTF-8 */
-
-#define REG_NODE_NUM(x) ((x) ? (int)((x)-RExC_emit_start) : -1)
-
-/* whether trie related optimizations are enabled */
-#if PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION
-#define TRIE_STUDY_OPT
-#define FULL_TRIE_STUDY
-#define TRIE_STCLASS
-#endif
-
-
-
-#define PBYTE(u8str,paren) ((U8*)(u8str))[(paren) >> 3]
-#define PBITVAL(paren) (1 << ((paren) & 7))
-#define PAREN_TEST(u8str,paren) ( PBYTE(u8str,paren) & PBITVAL(paren))
-#define PAREN_SET(u8str,paren) PBYTE(u8str,paren) |= PBITVAL(paren)
-#define PAREN_UNSET(u8str,paren) PBYTE(u8str,paren) &= (~PBITVAL(paren))
-
-#define REQUIRE_UTF8 STMT_START { \
- if (!UTF) { \
- *flagp = RESTART_UTF8; \
- return NULL; \
- } \
- } STMT_END
-
-/* This converts the named class defined in regcomp.h to its equivalent class
- * number defined in handy.h. */
-#define namedclass_to_classnum(class) ((int) ((class) / 2))
-#define classnum_to_namedclass(classnum) ((classnum) * 2)
-
-#define _invlist_union_complement_2nd(a, b, output) \
- _invlist_union_maybe_complement_2nd(a, b, TRUE, output)
-#define _invlist_intersection_complement_2nd(a, b, output) \
- _invlist_intersection_maybe_complement_2nd(a, b, TRUE, output)
-
-/* About scan_data_t.
-
- During optimisation we recurse through the regexp program performing
- various inplace (keyhole style) optimisations. In addition study_chunk
- and scan_commit populate this data structure with information about
- what strings MUST appear in the pattern. We look for the longest
- string that must appear at a fixed location, and we look for the
- longest string that may appear at a floating location. So for instance
- in the pattern:
-
- /FOO[xX]A.*B[xX]BAR/
-
- Both 'FOO' and 'A' are fixed strings. Both 'B' and 'BAR' are floating
- strings (because they follow a .* construct). study_chunk will identify
- both FOO and BAR as being the longest fixed and floating strings respectively.
-
- The strings can be composites, for instance
-
- /(f)(o)(o)/
-
- will result in a composite fixed substring 'foo'.
-
- For each string some basic information is maintained:
-
- - offset or min_offset
- This is the position the string must appear at, or not before.
- It also implicitly (when combined with minlenp) tells us how many
- characters must match before the string we are searching for.
- Likewise when combined with minlenp and the length of the string it
- tells us how many characters must appear after the string we have
- found.
-
- - max_offset
- Only used for floating strings. This is the rightmost point that
- the string can appear at. If set to SSize_t_MAX it indicates that the
- string can occur infinitely far to the right.
-
- - minlenp
- A pointer to the minimum number of characters of the pattern that the
- string was found inside. This is important as in the case of positive
- lookahead or positive lookbehind we can have multiple patterns
- involved. Consider
-
- /(?=FOO).*F/
-
- The minimum length of the pattern overall is 3, the minimum length
- of the lookahead part is 3, but the minimum length of the part that
- will actually match is 1. So 'FOO's minimum length is 3, but the
- minimum length for the F is 1. This is important as the minimum length
- is used to determine offsets in front of and behind the string being
- looked for. Since strings can be composites this is the length of the
- pattern at the time it was committed with a scan_commit. Note that
- the length is calculated by study_chunk, so that the minimum lengths
- are not known until the full pattern has been compiled, thus the
- pointer to the value.
-
- - lookbehind
-
- In the case of lookbehind the string being searched for can be
- offset past the start point of the final matching string.
- If this value was just blithely removed from the min_offset it would
- invalidate some of the calculations for how many chars must match
- before or after (as they are derived from min_offset and minlen and
- the length of the string being searched for).
- When the final pattern is compiled and the data is moved from the
- scan_data_t structure into the regexp structure the information
- about lookbehind is factored in, with the information that would
- have been lost precalculated in the end_shift field for the
- associated string.
-
- The fields pos_min and pos_delta are used to store the minimum offset
- and the delta to the maximum offset at the current point in the pattern.
-
-*/
-
-typedef struct scan_data_t {
- /*I32 len_min; unused */
- /*I32 len_delta; unused */
- SSize_t pos_min;
- SSize_t pos_delta;
- SV *last_found;
- SSize_t last_end; /* min value, <0 unless valid. */
- SSize_t last_start_min;
- SSize_t last_start_max;
- SV **longest; /* Either &l_fixed, or &l_float. */
- SV *longest_fixed; /* longest fixed string found in pattern */
- SSize_t offset_fixed; /* offset where it starts */
- SSize_t *minlen_fixed; /* pointer to the minlen relevant to the string */
- I32 lookbehind_fixed; /* is the position of the string modfied by LB */
- SV *longest_float; /* longest floating string found in pattern */
- SSize_t offset_float_min; /* earliest point in string it can appear */
- SSize_t offset_float_max; /* latest point in string it can appear */
- SSize_t *minlen_float; /* pointer to the minlen relevant to the string */
- SSize_t lookbehind_float; /* is the pos of the string modified by LB */
- I32 flags;
- I32 whilem_c;
- SSize_t *last_closep;
- regnode_ssc *start_class;
-} scan_data_t;
-
-/* The below is perhaps overboard, but this allows us to save a test at the
- * expense of a mask. This is because on both EBCDIC and ASCII machines, 'A'
- * and 'a' differ by a single bit; the same with the upper and lower case of
- * all other ASCII-range alphabetics. On ASCII platforms, they are 32 apart;
- * on EBCDIC, they are 64. This uses an exclusive 'or' to find that bit and
- * then inverts it to form a mask, with just a single 0, in the bit position
- * where the upper- and lowercase differ. XXX There are about 40 other
- * instances in the Perl core where this micro-optimization could be used.
- * Should decide if maintenance cost is worse, before changing those
- *
- * Returns a boolean as to whether or not 'v' is either a lowercase or
- * uppercase instance of 'c', where 'c' is in [A-Za-z]. If 'c' is a
- * compile-time constant, the generated code is better than some optimizing
- * compilers figure out, amounting to a mask and test. The results are
- * meaningless if 'c' is not one of [A-Za-z] */
-#define isARG2_lower_or_UPPER_ARG1(c, v) \
- (((v) & ~('A' ^ 'a')) == ((c) & ~('A' ^ 'a')))
-
-/*
- * Forward declarations for pregcomp()'s friends.
- */
-
-static const scan_data_t zero_scan_data =
- { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
-
-#define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
-#define SF_BEFORE_SEOL 0x0001
-#define SF_BEFORE_MEOL 0x0002
-#define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
-#define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
-
-#define SF_FIX_SHIFT_EOL (+2)
-#define SF_FL_SHIFT_EOL (+4)
-
-#define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
-#define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
-
-#define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
-#define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
-#define SF_IS_INF 0x0040
-#define SF_HAS_PAR 0x0080
-#define SF_IN_PAR 0x0100
-#define SF_HAS_EVAL 0x0200
-#define SCF_DO_SUBSTR 0x0400
-#define SCF_DO_STCLASS_AND 0x0800
-#define SCF_DO_STCLASS_OR 0x1000
-#define SCF_DO_STCLASS (SCF_DO_STCLASS_AND|SCF_DO_STCLASS_OR)
-#define SCF_WHILEM_VISITED_POS 0x2000
-
-#define SCF_TRIE_RESTUDY 0x4000 /* Do restudy? */
-#define SCF_SEEN_ACCEPT 0x8000
-#define SCF_TRIE_DOING_RESTUDY 0x10000
-
-#define UTF cBOOL(RExC_utf8)
-
-/* The enums for all these are ordered so things work out correctly */
-#define LOC (get_regex_charset(RExC_flags) == REGEX_LOCALE_CHARSET)
-#define DEPENDS_SEMANTICS (get_regex_charset(RExC_flags) \
- == REGEX_DEPENDS_CHARSET)
-#define UNI_SEMANTICS (get_regex_charset(RExC_flags) == REGEX_UNICODE_CHARSET)
-#define AT_LEAST_UNI_SEMANTICS (get_regex_charset(RExC_flags) \
- >= REGEX_UNICODE_CHARSET)
-#define ASCII_RESTRICTED (get_regex_charset(RExC_flags) \
- == REGEX_ASCII_RESTRICTED_CHARSET)
-#define AT_LEAST_ASCII_RESTRICTED (get_regex_charset(RExC_flags) \
- >= REGEX_ASCII_RESTRICTED_CHARSET)
-#define ASCII_FOLD_RESTRICTED (get_regex_charset(RExC_flags) \
- == REGEX_ASCII_MORE_RESTRICTED_CHARSET)
-
-#define FOLD cBOOL(RExC_flags & RXf_PMf_FOLD)
-
-/* For programs that want to be strictly Unicode compatible by dying if any
- * attempt is made to match a non-Unicode code point against a Unicode
- * property. */
-#define ALWAYS_WARN_SUPER ckDEAD(packWARN(WARN_NON_UNICODE))
-
-#define OOB_NAMEDCLASS -1
-
-/* There is no code point that is out-of-bounds, so this is problematic. But
- * its only current use is to initialize a variable that is always set before
- * looked at. */
-#define OOB_UNICODE 0xDEADBEEF
-
-#define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
-#define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
-
-
-/* length of regex to show in messages that don't mark a position within */
-#define RegexLengthToShowInErrorMessages 127
-
-/*
- * If MARKER[12] are adjusted, be sure to adjust the constants at the top
- * of t/op/regmesg.t, the tests in t/op/re_tests, and those in
- * op/pragma/warn/regcomp.
- */
-#define MARKER1 "<-- HERE" /* marker as it appears in the description */
-#define MARKER2 " <-- HERE " /* marker as it appears within the regex */
-
-#define REPORT_LOCATION " in regex; marked by " MARKER1 \
- " in m/%"UTF8f MARKER2 "%"UTF8f"/"
-
-#define REPORT_LOCATION_ARGS(offset) \
- UTF8fARG(UTF, offset, RExC_precomp), \
- UTF8fARG(UTF, RExC_end - RExC_precomp - offset, RExC_precomp + offset)
-
-/*
- * Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
- * arg. Show regex, up to a maximum length. If it's too long, chop and add
- * "...".
- */
-#define _FAIL(code) STMT_START { \
- const char *ellipses = ""; \
- IV len = RExC_end - RExC_precomp; \
- \
- if (!SIZE_ONLY) \
- SAVEFREESV(RExC_rx_sv); \
- if (len > RegexLengthToShowInErrorMessages) { \
- /* chop 10 shorter than the max, to ensure meaning of "..." */ \
- len = RegexLengthToShowInErrorMessages - 10; \
- ellipses = "..."; \
- } \
- code; \
-} STMT_END
-
-#define FAIL(msg) _FAIL( \
- Perl_croak(aTHX_ "%s in regex m/%"UTF8f"%s/", \
- msg, UTF8fARG(UTF, len, RExC_precomp), ellipses))
-
-#define FAIL2(msg,arg) _FAIL( \
- Perl_croak(aTHX_ msg " in regex m/%"UTF8f"%s/", \
- arg, UTF8fARG(UTF, len, RExC_precomp), ellipses))
-
-/*
- * Simple_vFAIL -- like FAIL, but marks the current location in the scan
- */
-#define Simple_vFAIL(m) STMT_START { \
- const IV offset = RExC_parse - RExC_precomp; \
- Perl_croak(aTHX_ "%s" REPORT_LOCATION, \
- m, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-/*
- * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL()
- */
-#define vFAIL(m) STMT_START { \
- if (!SIZE_ONLY) \
- SAVEFREESV(RExC_rx_sv); \
- Simple_vFAIL(m); \
-} STMT_END
-
-/*
- * Like Simple_vFAIL(), but accepts two arguments.
- */
-#define Simple_vFAIL2(m,a1) STMT_START { \
- const IV offset = RExC_parse - RExC_precomp; \
- S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-/*
- * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL2().
- */
-#define vFAIL2(m,a1) STMT_START { \
- if (!SIZE_ONLY) \
- SAVEFREESV(RExC_rx_sv); \
- Simple_vFAIL2(m, a1); \
-} STMT_END
-
-
-/*
- * Like Simple_vFAIL(), but accepts three arguments.
- */
-#define Simple_vFAIL3(m, a1, a2) STMT_START { \
- const IV offset = RExC_parse - RExC_precomp; \
- S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, a2, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-/*
- * Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL3().
- */
-#define vFAIL3(m,a1,a2) STMT_START { \
- if (!SIZE_ONLY) \
- SAVEFREESV(RExC_rx_sv); \
- Simple_vFAIL3(m, a1, a2); \
-} STMT_END
-
-/*
- * Like Simple_vFAIL(), but accepts four arguments.
- */
-#define Simple_vFAIL4(m, a1, a2, a3) STMT_START { \
- const IV offset = RExC_parse - RExC_precomp; \
- S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, a2, a3, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define vFAIL4(m,a1,a2,a3) STMT_START { \
- if (!SIZE_ONLY) \
- SAVEFREESV(RExC_rx_sv); \
- Simple_vFAIL4(m, a1, a2, a3); \
-} STMT_END
-
-/* A specialized version of vFAIL2 that works with UTF8f */
-#define vFAIL2utf8f(m, a1) STMT_START { \
- const IV offset = RExC_parse - RExC_precomp; \
- if (!SIZE_ONLY) \
- SAVEFREESV(RExC_rx_sv); \
- S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-
-/* m is not necessarily a "literal string", in this macro */
-#define reg_warn_non_literal_string(loc, m) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s" REPORT_LOCATION, \
- m, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define ckWARNreg(loc,m) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define vWARN_dep(loc, m) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_warner(aTHX_ packWARN(WARN_DEPRECATED), m REPORT_LOCATION, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define ckWARNdep(loc,m) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED), \
- m REPORT_LOCATION, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define ckWARNregdep(loc,m) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_REGEXP), \
- m REPORT_LOCATION, \
- REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define ckWARN2reg_d(loc,m, a1) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_ck_warner_d(aTHX_ packWARN(WARN_REGEXP), \
- m REPORT_LOCATION, \
- a1, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define ckWARN2reg(loc, m, a1) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
- a1, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define vWARN3(loc, m, a1, a2) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
- a1, a2, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define ckWARN3reg(loc, m, a1, a2) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
- a1, a2, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define vWARN4(loc, m, a1, a2, a3) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
- a1, a2, a3, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define ckWARN4reg(loc, m, a1, a2, a3) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
- a1, a2, a3, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-#define vWARN5(loc, m, a1, a2, a3, a4) STMT_START { \
- const IV offset = loc - RExC_precomp; \
- Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
- a1, a2, a3, a4, REPORT_LOCATION_ARGS(offset)); \
-} STMT_END
-
-
-/* Allow for side effects in s */
-#define REGC(c,s) STMT_START { \
- if (!SIZE_ONLY) *(s) = (c); else (void)(s); \
-} STMT_END
-
-/* Macros for recording node offsets. 20001227 mjd@plover.com
- * Nodes are numbered 1, 2, 3, 4. Node #n's position is recorded in
- * element 2*n-1 of the array. Element #2n holds the byte length node #n.
- * Element 0 holds the number n.
- * Position is 1 indexed.
- */
-#ifndef RE_TRACK_PATTERN_OFFSETS
-#define Set_Node_Offset_To_R(node,byte)
-#define Set_Node_Offset(node,byte)
-#define Set_Cur_Node_Offset
-#define Set_Node_Length_To_R(node,len)
-#define Set_Node_Length(node,len)
-#define Set_Node_Cur_Length(node,start)
-#define Node_Offset(n)
-#define Node_Length(n)
-#define Set_Node_Offset_Length(node,offset,len)
-#define ProgLen(ri) ri->u.proglen
-#define SetProgLen(ri,x) ri->u.proglen = x
-#else
-#define ProgLen(ri) ri->u.offsets[0]
-#define SetProgLen(ri,x) ri->u.offsets[0] = x
-#define Set_Node_Offset_To_R(node,byte) STMT_START { \
- if (! SIZE_ONLY) { \
- MJD_OFFSET_DEBUG(("** (%d) offset of node %d is %d.\n", \
- __LINE__, (int)(node), (int)(byte))); \
- if((node) < 0) { \
- Perl_croak(aTHX_ "value of node is %d in Offset macro", \
- (int)(node)); \
- } else { \
- RExC_offsets[2*(node)-1] = (byte); \
- } \
- } \
-} STMT_END
-
-#define Set_Node_Offset(node,byte) \
- Set_Node_Offset_To_R((node)-RExC_emit_start, (byte)-RExC_start)
-#define Set_Cur_Node_Offset Set_Node_Offset(RExC_emit, RExC_parse)
-
-#define Set_Node_Length_To_R(node,len) STMT_START { \
- if (! SIZE_ONLY) { \
- MJD_OFFSET_DEBUG(("** (%d) size of node %d is %d.\n", \
- __LINE__, (int)(node), (int)(len))); \
- if((node) < 0) { \
- Perl_croak(aTHX_ "value of node is %d in Length macro", \
- (int)(node)); \
- } else { \
- RExC_offsets[2*(node)] = (len); \
- } \
- } \
-} STMT_END
-
-#define Set_Node_Length(node,len) \
- Set_Node_Length_To_R((node)-RExC_emit_start, len)
-#define Set_Node_Cur_Length(node, start) \
- Set_Node_Length(node, RExC_parse - start)
-
-/* Get offsets and lengths */
-#define Node_Offset(n) (RExC_offsets[2*((n)-RExC_emit_start)-1])
-#define Node_Length(n) (RExC_offsets[2*((n)-RExC_emit_start)])
-
-#define Set_Node_Offset_Length(node,offset,len) STMT_START { \
- Set_Node_Offset_To_R((node)-RExC_emit_start, (offset)); \
- Set_Node_Length_To_R((node)-RExC_emit_start, (len)); \
-} STMT_END
-#endif
-
-#if PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS
-#define EXPERIMENTAL_INPLACESCAN
-#endif /*PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS*/
-
-#define DEBUG_RExC_seen() \
- DEBUG_OPTIMISE_MORE_r({ \
- PerlIO_printf(Perl_debug_log,"RExC_seen: "); \
- \
- if (RExC_seen & REG_ZERO_LEN_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_ZERO_LEN_SEEN "); \
- \
- if (RExC_seen & REG_LOOKBEHIND_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_LOOKBEHIND_SEEN "); \
- \
- if (RExC_seen & REG_GPOS_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_GPOS_SEEN "); \
- \
- if (RExC_seen & REG_CANY_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_CANY_SEEN "); \
- \
- if (RExC_seen & REG_RECURSE_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_RECURSE_SEEN "); \
- \
- if (RExC_seen & REG_TOP_LEVEL_BRANCHES_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_TOP_LEVEL_BRANCHES_SEEN "); \
- \
- if (RExC_seen & REG_VERBARG_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_VERBARG_SEEN "); \
- \
- if (RExC_seen & REG_CUTGROUP_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_CUTGROUP_SEEN "); \
- \
- if (RExC_seen & REG_RUN_ON_COMMENT_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_RUN_ON_COMMENT_SEEN "); \
- \
- if (RExC_seen & REG_UNFOLDED_MULTI_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_UNFOLDED_MULTI_SEEN "); \
- \
- if (RExC_seen & REG_GOSTART_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_GOSTART_SEEN "); \
- \
- if (RExC_seen & REG_UNBOUNDED_QUANTIFIER_SEEN) \
- PerlIO_printf(Perl_debug_log,"REG_UNBOUNDED_QUANTIFIER_SEEN "); \
- \
- PerlIO_printf(Perl_debug_log,"\n"); \
- });
-
-#define DEBUG_STUDYDATA(str,data,depth) \
-DEBUG_OPTIMISE_MORE_r(if(data){ \
- PerlIO_printf(Perl_debug_log, \
- "%*s" str "Pos:%"IVdf"/%"IVdf \
- " Flags: 0x%"UVXf" Whilem_c: %"IVdf" Lcp: %"IVdf" %s", \
- (int)(depth)*2, "", \
- (IV)((data)->pos_min), \
- (IV)((data)->pos_delta), \
- (UV)((data)->flags), \
- (IV)((data)->whilem_c), \
- (IV)((data)->last_closep ? *((data)->last_closep) : -1), \
- is_inf ? "INF " : "" \
- ); \
- if ((data)->last_found) \
- PerlIO_printf(Perl_debug_log, \
- "Last:'%s' %"IVdf":%"IVdf"/%"IVdf" %sFixed:'%s' @ %"IVdf \
- " %sFloat: '%s' @ %"IVdf"/%"IVdf"", \
- SvPVX_const((data)->last_found), \
- (IV)((data)->last_end), \
- (IV)((data)->last_start_min), \
- (IV)((data)->last_start_max), \
- ((data)->longest && \
- (data)->longest==&((data)->longest_fixed)) ? "*" : "", \
- SvPVX_const((data)->longest_fixed), \
- (IV)((data)->offset_fixed), \
- ((data)->longest && \
- (data)->longest==&((data)->longest_float)) ? "*" : "", \
- SvPVX_const((data)->longest_float), \
- (IV)((data)->offset_float_min), \
- (IV)((data)->offset_float_max) \
- ); \
- PerlIO_printf(Perl_debug_log,"\n"); \
-});
-
-/* Mark that we cannot extend a found fixed substring at this point.
- Update the longest found anchored substring and the longest found
- floating substrings if needed. */
-
-STATIC void
-S_scan_commit(pTHX_ const RExC_state_t *pRExC_state, scan_data_t *data,
- SSize_t *minlenp, int is_inf)
-{
- const STRLEN l = CHR_SVLEN(data->last_found);
- const STRLEN old_l = CHR_SVLEN(*data->longest);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_SCAN_COMMIT;
-
- if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
- SvSetMagicSV(*data->longest, data->last_found);
- if (*data->longest == data->longest_fixed) {
- data->offset_fixed = l ? data->last_start_min : data->pos_min;
- if (data->flags & SF_BEFORE_EOL)
- data->flags
- |= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
- else
- data->flags &= ~SF_FIX_BEFORE_EOL;
- data->minlen_fixed=minlenp;
- data->lookbehind_fixed=0;
- }
- else { /* *data->longest == data->longest_float */
- data->offset_float_min = l ? data->last_start_min : data->pos_min;
- data->offset_float_max = (l
- ? data->last_start_max
- : (data->pos_delta == SSize_t_MAX
- ? SSize_t_MAX
- : data->pos_min + data->pos_delta));
- if (is_inf
- || (STRLEN)data->offset_float_max > (STRLEN)SSize_t_MAX)
- data->offset_float_max = SSize_t_MAX;
- if (data->flags & SF_BEFORE_EOL)
- data->flags
- |= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
- else
- data->flags &= ~SF_FL_BEFORE_EOL;
- data->minlen_float=minlenp;
- data->lookbehind_float=0;
- }
- }
- SvCUR_set(data->last_found, 0);
- {
- SV * const sv = data->last_found;
- if (SvUTF8(sv) && SvMAGICAL(sv)) {
- MAGIC * const mg = mg_find(sv, PERL_MAGIC_utf8);
- if (mg)
- mg->mg_len = 0;
- }
- }
- data->last_end = -1;
- data->flags &= ~SF_BEFORE_EOL;
- DEBUG_STUDYDATA("commit: ",data,0);
-}
-
-/* An SSC is just a regnode_charclass_posix with an extra field: the inversion
- * list that describes which code points it matches */
-
-STATIC void
-S_ssc_anything(pTHX_ regnode_ssc *ssc)
-{
- /* Set the SSC 'ssc' to match an empty string or any code point */
-
- PERL_ARGS_ASSERT_SSC_ANYTHING;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- ssc->invlist = sv_2mortal(_new_invlist(2)); /* mortalize so won't leak */
- _append_range_to_invlist(ssc->invlist, 0, UV_MAX);
- ANYOF_FLAGS(ssc) |= ANYOF_EMPTY_STRING; /* Plus match empty string */
-}
-
-STATIC int
-S_ssc_is_anything(const regnode_ssc *ssc)
-{
- /* Returns TRUE if the SSC 'ssc' can match the empty string and any code
- * point; FALSE otherwise. Thus, this is used to see if using 'ssc' buys
- * us anything: if the function returns TRUE, 'ssc' hasn't been restricted
- * in any way, so there's no point in using it */
-
- UV start, end;
- bool ret;
-
- PERL_ARGS_ASSERT_SSC_IS_ANYTHING;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- if (! (ANYOF_FLAGS(ssc) & ANYOF_EMPTY_STRING)) {
- return FALSE;
- }
-
- /* See if the list consists solely of the range 0 - Infinity */
- invlist_iterinit(ssc->invlist);
- ret = invlist_iternext(ssc->invlist, &start, &end)
- && start == 0
- && end == UV_MAX;
-
- invlist_iterfinish(ssc->invlist);
-
- if (ret) {
- return TRUE;
- }
-
- /* If e.g., both \w and \W are set, matches everything */
- if (ANYOF_POSIXL_SSC_TEST_ANY_SET(ssc)) {
- int i;
- for (i = 0; i < ANYOF_POSIXL_MAX; i += 2) {
- if (ANYOF_POSIXL_TEST(ssc, i) && ANYOF_POSIXL_TEST(ssc, i+1)) {
- return TRUE;
- }
- }
- }
-
- return FALSE;
-}
-
-STATIC void
-S_ssc_init(pTHX_ const RExC_state_t *pRExC_state, regnode_ssc *ssc)
-{
- /* Initializes the SSC 'ssc'. This includes setting it to match an empty
- * string, any code point, or any posix class under locale */
-
- PERL_ARGS_ASSERT_SSC_INIT;
-
- Zero(ssc, 1, regnode_ssc);
- set_ANYOF_SYNTHETIC(ssc);
- ARG_SET(ssc, ANYOF_NONBITMAP_EMPTY);
- ssc_anything(ssc);
-
- /* If any portion of the regex is to operate under locale rules,
- * initialization includes it. The reason this isn't done for all regexes
- * is that the optimizer was written under the assumption that locale was
- * all-or-nothing. Given the complexity and lack of documentation in the
- * optimizer, and that there are inadequate test cases for locale, many
- * parts of it may not work properly, it is safest to avoid locale unless
- * necessary. */
- if (RExC_contains_locale) {
- ANYOF_POSIXL_SETALL(ssc);
- }
- else {
- ANYOF_POSIXL_ZERO(ssc);
- }
-}
-
-STATIC int
-S_ssc_is_cp_posixl_init(const RExC_state_t *pRExC_state,
- const regnode_ssc *ssc)
-{
- /* Returns TRUE if the SSC 'ssc' is in its initial state with regard only
- * to the list of code points matched, and locale posix classes; hence does
- * not check its flags) */
-
- UV start, end;
- bool ret;
-
- PERL_ARGS_ASSERT_SSC_IS_CP_POSIXL_INIT;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- invlist_iterinit(ssc->invlist);
- ret = invlist_iternext(ssc->invlist, &start, &end)
- && start == 0
- && end == UV_MAX;
-
- invlist_iterfinish(ssc->invlist);
-
- if (! ret) {
- return FALSE;
- }
-
- if (RExC_contains_locale && ! ANYOF_POSIXL_SSC_TEST_ALL_SET(ssc)) {
- return FALSE;
- }
-
- return TRUE;
-}
-
-STATIC SV*
-S_get_ANYOF_cp_list_for_ssc(pTHX_ const RExC_state_t *pRExC_state,
- const regnode_charclass* const node)
-{
- /* Returns a mortal inversion list defining which code points are matched
- * by 'node', which is of type ANYOF. Handles complementing the result if
- * appropriate. If some code points aren't knowable at this time, the
- * returned list must, and will, contain every code point that is a
- * possibility. */
-
- SV* invlist = sv_2mortal(_new_invlist(0));
- SV* only_utf8_locale_invlist = NULL;
- unsigned int i;
- const U32 n = ARG(node);
- bool new_node_has_latin1 = FALSE;
-
- PERL_ARGS_ASSERT_GET_ANYOF_CP_LIST_FOR_SSC;
-
- /* Look at the data structure created by S_set_ANYOF_arg() */
- if (n != ANYOF_NONBITMAP_EMPTY) {
- SV * const rv = MUTABLE_SV(RExC_rxi->data->data[n]);
- AV * const av = MUTABLE_AV(SvRV(rv));
- SV **const ary = AvARRAY(av);
- assert(RExC_rxi->data->what[n] == 's');
-
- if (ary[1] && ary[1] != &PL_sv_undef) { /* Has compile-time swash */
- invlist = sv_2mortal(invlist_clone(_get_swash_invlist(ary[1])));
- }
- else if (ary[0] && ary[0] != &PL_sv_undef) {
-
- /* Here, no compile-time swash, and there are things that won't be
- * known until runtime -- we have to assume it could be anything */
- return _add_range_to_invlist(invlist, 0, UV_MAX);
- }
- else if (ary[3] && ary[3] != &PL_sv_undef) {
-
- /* Here no compile-time swash, and no run-time only data. Use the
- * node's inversion list */
- invlist = sv_2mortal(invlist_clone(ary[3]));
- }
-
- /* Get the code points valid only under UTF-8 locales */
- if ((ANYOF_FLAGS(node) & ANYOF_LOC_FOLD)
- && ary[2] && ary[2] != &PL_sv_undef)
- {
- only_utf8_locale_invlist = ary[2];
- }
- }
-
- /* An ANYOF node contains a bitmap for the first 256 code points, and an
- * inversion list for the others, but if there are code points that should
- * match only conditionally on the target string being UTF-8, those are
- * placed in the inversion list, and not the bitmap. Since there are
- * circumstances under which they could match, they are included in the
- * SSC. But if the ANYOF node is to be inverted, we have to exclude them
- * here, so that when we invert below, the end result actually does include
- * them. (Think about "\xe0" =~ /[^\xc0]/di;). We have to do this here
- * before we add the unconditionally matched code points */
- if (ANYOF_FLAGS(node) & ANYOF_INVERT) {
- _invlist_intersection_complement_2nd(invlist,
- PL_UpperLatin1,
- &invlist);
- }
-
- /* Add in the points from the bit map */
- for (i = 0; i < 256; i++) {
- if (ANYOF_BITMAP_TEST(node, i)) {
- invlist = add_cp_to_invlist(invlist, i);
- new_node_has_latin1 = TRUE;
- }
- }
-
- /* If this can match all upper Latin1 code points, have to add them
- * as well */
- if (ANYOF_FLAGS(node) & ANYOF_NON_UTF8_NON_ASCII_ALL) {
- _invlist_union(invlist, PL_UpperLatin1, &invlist);
- }
-
- /* Similarly for these */
- if (ANYOF_FLAGS(node) & ANYOF_ABOVE_LATIN1_ALL) {
- invlist = _add_range_to_invlist(invlist, 256, UV_MAX);
- }
-
- if (ANYOF_FLAGS(node) & ANYOF_INVERT) {
- _invlist_invert(invlist);
- }
- else if (new_node_has_latin1 && ANYOF_FLAGS(node) & ANYOF_LOC_FOLD) {
-
- /* Under /li, any 0-255 could fold to any other 0-255, depending on the
- * locale. We can skip this if there are no 0-255 at all. */
- _invlist_union(invlist, PL_Latin1, &invlist);
- }
-
- /* Similarly add the UTF-8 locale possible matches. These have to be
- * deferred until after the non-UTF-8 locale ones are taken care of just
- * above, or it leads to wrong results under ANYOF_INVERT */
- if (only_utf8_locale_invlist) {
- _invlist_union_maybe_complement_2nd(invlist,
- only_utf8_locale_invlist,
- ANYOF_FLAGS(node) & ANYOF_INVERT,
- &invlist);
- }
-
- return invlist;
-}
-
-/* These two functions currently do the exact same thing */
-#define ssc_init_zero ssc_init
-
-#define ssc_add_cp(ssc, cp) ssc_add_range((ssc), (cp), (cp))
-#define ssc_match_all_cp(ssc) ssc_add_range(ssc, 0, UV_MAX)
-
-/* 'AND' a given class with another one. Can create false positives. 'ssc'
- * should not be inverted. 'and_with->flags & ANYOF_POSIXL' should be 0 if
- * 'and_with' is a regnode_charclass instead of a regnode_ssc. */
-
-STATIC void
-S_ssc_and(pTHX_ const RExC_state_t *pRExC_state, regnode_ssc *ssc,
- const regnode_charclass *and_with)
-{
- /* Accumulate into SSC 'ssc' its 'AND' with 'and_with', which is either
- * another SSC or a regular ANYOF class. Can create false positives. */
-
- SV* anded_cp_list;
- U8 anded_flags;
-
- PERL_ARGS_ASSERT_SSC_AND;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- /* 'and_with' is used as-is if it too is an SSC; otherwise have to extract
- * the code point inversion list and just the relevant flags */
- if (is_ANYOF_SYNTHETIC(and_with)) {
- anded_cp_list = ((regnode_ssc *)and_with)->invlist;
- anded_flags = ANYOF_FLAGS(and_with);
-
- /* XXX This is a kludge around what appears to be deficiencies in the
- * optimizer. If we make S_ssc_anything() add in the WARN_SUPER flag,
- * there are paths through the optimizer where it doesn't get weeded
- * out when it should. And if we don't make some extra provision for
- * it like the code just below, it doesn't get added when it should.
- * This solution is to add it only when AND'ing, which is here, and
- * only when what is being AND'ed is the pristine, original node
- * matching anything. Thus it is like adding it to ssc_anything() but
- * only when the result is to be AND'ed. Probably the same solution
- * could be adopted for the same problem we have with /l matching,
- * which is solved differently in S_ssc_init(), and that would lead to
- * fewer false positives than that solution has. But if this solution
- * creates bugs, the consequences are only that a warning isn't raised
- * that should be; while the consequences for having /l bugs is
- * incorrect matches */
- if (ssc_is_anything((regnode_ssc *)and_with)) {
- anded_flags |= ANYOF_WARN_SUPER;
- }
- }
- else {
- anded_cp_list = get_ANYOF_cp_list_for_ssc(pRExC_state, and_with);
- anded_flags = ANYOF_FLAGS(and_with) & ANYOF_COMMON_FLAGS;
- }
-
- ANYOF_FLAGS(ssc) &= anded_flags;
-
- /* Below, C1 is the list of code points in 'ssc'; P1, its posix classes.
- * C2 is the list of code points in 'and-with'; P2, its posix classes.
- * 'and_with' may be inverted. When not inverted, we have the situation of
- * computing:
- * (C1 | P1) & (C2 | P2)
- * = (C1 & (C2 | P2)) | (P1 & (C2 | P2))
- * = ((C1 & C2) | (C1 & P2)) | ((P1 & C2) | (P1 & P2))
- * <= ((C1 & C2) | P2)) | ( P1 | (P1 & P2))
- * <= ((C1 & C2) | P1 | P2)
- * Alternatively, the last few steps could be:
- * = ((C1 & C2) | (C1 & P2)) | ((P1 & C2) | (P1 & P2))
- * <= ((C1 & C2) | C1 ) | ( C2 | (P1 & P2))
- * <= (C1 | C2 | (P1 & P2))
- * We favor the second approach if either P1 or P2 is non-empty. This is
- * because these components are a barrier to doing optimizations, as what
- * they match cannot be known until the moment of matching as they are
- * dependent on the current locale, 'AND"ing them likely will reduce or
- * eliminate them.
- * But we can do better if we know that C1,P1 are in their initial state (a
- * frequent occurrence), each matching everything:
- * (<everything>) & (C2 | P2) = C2 | P2
- * Similarly, if C2,P2 are in their initial state (again a frequent
- * occurrence), the result is a no-op
- * (C1 | P1) & (<everything>) = C1 | P1
- *
- * Inverted, we have
- * (C1 | P1) & ~(C2 | P2) = (C1 | P1) & (~C2 & ~P2)
- * = (C1 & (~C2 & ~P2)) | (P1 & (~C2 & ~P2))
- * <= (C1 & ~C2) | (P1 & ~P2)
- * */
-
- if ((ANYOF_FLAGS(and_with) & ANYOF_INVERT)
- && ! is_ANYOF_SYNTHETIC(and_with))
- {
- unsigned int i;
-
- ssc_intersection(ssc,
- anded_cp_list,
- FALSE /* Has already been inverted */
- );
-
- /* If either P1 or P2 is empty, the intersection will be also; can skip
- * the loop */
- if (! (ANYOF_FLAGS(and_with) & ANYOF_POSIXL)) {
- ANYOF_POSIXL_ZERO(ssc);
- }
- else if (ANYOF_POSIXL_SSC_TEST_ANY_SET(ssc)) {
-
- /* Note that the Posix class component P from 'and_with' actually
- * looks like:
- * P = Pa | Pb | ... | Pn
- * where each component is one posix class, such as in [\w\s].
- * Thus
- * ~P = ~(Pa | Pb | ... | Pn)
- * = ~Pa & ~Pb & ... & ~Pn
- * <= ~Pa | ~Pb | ... | ~Pn
- * The last is something we can easily calculate, but unfortunately
- * is likely to have many false positives. We could do better
- * in some (but certainly not all) instances if two classes in
- * P have known relationships. For example
- * :lower: <= :alpha: <= :alnum: <= \w <= :graph: <= :print:
- * So
- * :lower: & :print: = :lower:
- * And similarly for classes that must be disjoint. For example,
- * since \s and \w can have no elements in common based on rules in
- * the POSIX standard,
- * \w & ^\S = nothing
- * Unfortunately, some vendor locales do not meet the Posix
- * standard, in particular almost everything by Microsoft.
- * The loop below just changes e.g., \w into \W and vice versa */
-
- regnode_charclass_posixl temp;
- int add = 1; /* To calculate the index of the complement */
-
- ANYOF_POSIXL_ZERO(&temp);
- for (i = 0; i < ANYOF_MAX; i++) {
- assert(i % 2 != 0
- || ! ANYOF_POSIXL_TEST((regnode_charclass_posixl*) and_with, i)
- || ! ANYOF_POSIXL_TEST((regnode_charclass_posixl*) and_with, i + 1));
-
- if (ANYOF_POSIXL_TEST((regnode_charclass_posixl*) and_with, i)) {
- ANYOF_POSIXL_SET(&temp, i + add);
- }
- add = 0 - add; /* 1 goes to -1; -1 goes to 1 */
- }
- ANYOF_POSIXL_AND(&temp, ssc);
-
- } /* else ssc already has no posixes */
- } /* else: Not inverted. This routine is a no-op if 'and_with' is an SSC
- in its initial state */
- else if (! is_ANYOF_SYNTHETIC(and_with)
- || ! ssc_is_cp_posixl_init(pRExC_state, (regnode_ssc *)and_with))
- {
- /* But if 'ssc' is in its initial state, the result is just 'and_with';
- * copy it over 'ssc' */
- if (ssc_is_cp_posixl_init(pRExC_state, ssc)) {
- if (is_ANYOF_SYNTHETIC(and_with)) {
- StructCopy(and_with, ssc, regnode_ssc);
- }
- else {
- ssc->invlist = anded_cp_list;
- ANYOF_POSIXL_ZERO(ssc);
- if (ANYOF_FLAGS(and_with) & ANYOF_POSIXL) {
- ANYOF_POSIXL_OR((regnode_charclass_posixl*) and_with, ssc);
- }
- }
- }
- else if (ANYOF_POSIXL_SSC_TEST_ANY_SET(ssc)
- || (ANYOF_FLAGS(and_with) & ANYOF_POSIXL))
- {
- /* One or the other of P1, P2 is non-empty. */
- if (ANYOF_FLAGS(and_with) & ANYOF_POSIXL) {
- ANYOF_POSIXL_AND((regnode_charclass_posixl*) and_with, ssc);
- }
- ssc_union(ssc, anded_cp_list, FALSE);
- }
- else { /* P1 = P2 = empty */
- ssc_intersection(ssc, anded_cp_list, FALSE);
- }
- }
-}
-
-STATIC void
-S_ssc_or(pTHX_ const RExC_state_t *pRExC_state, regnode_ssc *ssc,
- const regnode_charclass *or_with)
-{
- /* Accumulate into SSC 'ssc' its 'OR' with 'or_with', which is either
- * another SSC or a regular ANYOF class. Can create false positives if
- * 'or_with' is to be inverted. */
-
- SV* ored_cp_list;
- U8 ored_flags;
-
- PERL_ARGS_ASSERT_SSC_OR;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- /* 'or_with' is used as-is if it too is an SSC; otherwise have to extract
- * the code point inversion list and just the relevant flags */
- if (is_ANYOF_SYNTHETIC(or_with)) {
- ored_cp_list = ((regnode_ssc*) or_with)->invlist;
- ored_flags = ANYOF_FLAGS(or_with);
- }
- else {
- ored_cp_list = get_ANYOF_cp_list_for_ssc(pRExC_state, or_with);
- ored_flags = ANYOF_FLAGS(or_with) & ANYOF_COMMON_FLAGS;
- }
-
- ANYOF_FLAGS(ssc) |= ored_flags;
-
- /* Below, C1 is the list of code points in 'ssc'; P1, its posix classes.
- * C2 is the list of code points in 'or-with'; P2, its posix classes.
- * 'or_with' may be inverted. When not inverted, we have the simple
- * situation of computing:
- * (C1 | P1) | (C2 | P2) = (C1 | C2) | (P1 | P2)
- * If P1|P2 yields a situation with both a class and its complement are
- * set, like having both \w and \W, this matches all code points, and we
- * can delete these from the P component of the ssc going forward. XXX We
- * might be able to delete all the P components, but I (khw) am not certain
- * about this, and it is better to be safe.
- *
- * Inverted, we have
- * (C1 | P1) | ~(C2 | P2) = (C1 | P1) | (~C2 & ~P2)
- * <= (C1 | P1) | ~C2
- * <= (C1 | ~C2) | P1
- * (which results in actually simpler code than the non-inverted case)
- * */
-
- if ((ANYOF_FLAGS(or_with) & ANYOF_INVERT)
- && ! is_ANYOF_SYNTHETIC(or_with))
- {
- /* We ignore P2, leaving P1 going forward */
- } /* else Not inverted */
- else if (ANYOF_FLAGS(or_with) & ANYOF_POSIXL) {
- ANYOF_POSIXL_OR((regnode_charclass_posixl*)or_with, ssc);
- if (ANYOF_POSIXL_SSC_TEST_ANY_SET(ssc)) {
- unsigned int i;
- for (i = 0; i < ANYOF_MAX; i += 2) {
- if (ANYOF_POSIXL_TEST(ssc, i) && ANYOF_POSIXL_TEST(ssc, i + 1))
- {
- ssc_match_all_cp(ssc);
- ANYOF_POSIXL_CLEAR(ssc, i);
- ANYOF_POSIXL_CLEAR(ssc, i+1);
- }
- }
- }
- }
-
- ssc_union(ssc,
- ored_cp_list,
- FALSE /* Already has been inverted */
- );
-}
-
-PERL_STATIC_INLINE void
-S_ssc_union(pTHX_ regnode_ssc *ssc, SV* const invlist, const bool invert2nd)
-{
- PERL_ARGS_ASSERT_SSC_UNION;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- _invlist_union_maybe_complement_2nd(ssc->invlist,
- invlist,
- invert2nd,
- &ssc->invlist);
-}
-
-PERL_STATIC_INLINE void
-S_ssc_intersection(pTHX_ regnode_ssc *ssc,
- SV* const invlist,
- const bool invert2nd)
-{
- PERL_ARGS_ASSERT_SSC_INTERSECTION;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- _invlist_intersection_maybe_complement_2nd(ssc->invlist,
- invlist,
- invert2nd,
- &ssc->invlist);
-}
-
-PERL_STATIC_INLINE void
-S_ssc_add_range(pTHX_ regnode_ssc *ssc, const UV start, const UV end)
-{
- PERL_ARGS_ASSERT_SSC_ADD_RANGE;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- ssc->invlist = _add_range_to_invlist(ssc->invlist, start, end);
-}
-
-PERL_STATIC_INLINE void
-S_ssc_cp_and(pTHX_ regnode_ssc *ssc, const UV cp)
-{
- /* AND just the single code point 'cp' into the SSC 'ssc' */
-
- SV* cp_list = _new_invlist(2);
-
- PERL_ARGS_ASSERT_SSC_CP_AND;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- cp_list = add_cp_to_invlist(cp_list, cp);
- ssc_intersection(ssc, cp_list,
- FALSE /* Not inverted */
- );
- SvREFCNT_dec_NN(cp_list);
-}
-
-PERL_STATIC_INLINE void
-S_ssc_clear_locale(regnode_ssc *ssc)
-{
- /* Set the SSC 'ssc' to not match any locale things */
- PERL_ARGS_ASSERT_SSC_CLEAR_LOCALE;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- ANYOF_POSIXL_ZERO(ssc);
- ANYOF_FLAGS(ssc) &= ~ANYOF_LOCALE_FLAGS;
-}
-
-STATIC void
-S_ssc_finalize(pTHX_ RExC_state_t *pRExC_state, regnode_ssc *ssc)
-{
- /* The inversion list in the SSC is marked mortal; now we need a more
- * permanent copy, which is stored the same way that is done in a regular
- * ANYOF node, with the first 256 code points in a bit map */
-
- SV* invlist = invlist_clone(ssc->invlist);
-
- PERL_ARGS_ASSERT_SSC_FINALIZE;
-
- assert(is_ANYOF_SYNTHETIC(ssc));
-
- /* The code in this file assumes that all but these flags aren't relevant
- * to the SSC, except ANYOF_EMPTY_STRING, which should be cleared by the
- * time we reach here */
- assert(! (ANYOF_FLAGS(ssc) & ~ANYOF_COMMON_FLAGS));
-
- populate_ANYOF_from_invlist( (regnode *) ssc, &invlist);
-
- set_ANYOF_arg(pRExC_state, (regnode *) ssc, invlist,
- NULL, NULL, NULL, FALSE);
-
- /* Make sure is clone-safe */
- ssc->invlist = NULL;
-
- if (ANYOF_POSIXL_SSC_TEST_ANY_SET(ssc)) {
- ANYOF_FLAGS(ssc) |= ANYOF_POSIXL;
- }
-
- assert(! (ANYOF_FLAGS(ssc) & ANYOF_LOCALE_FLAGS) || RExC_contains_locale);
-}
-
-#define TRIE_LIST_ITEM(state,idx) (trie->states[state].trans.list)[ idx ]
-#define TRIE_LIST_CUR(state) ( TRIE_LIST_ITEM( state, 0 ).forid )
-#define TRIE_LIST_LEN(state) ( TRIE_LIST_ITEM( state, 0 ).newstate )
-#define TRIE_LIST_USED(idx) ( trie->states[state].trans.list \
- ? (TRIE_LIST_CUR( idx ) - 1) \
- : 0 )
-
-
-#ifdef DEBUGGING
-/*
- dump_trie(trie,widecharmap,revcharmap)
- dump_trie_interim_list(trie,widecharmap,revcharmap,next_alloc)
- dump_trie_interim_table(trie,widecharmap,revcharmap,next_alloc)
-
- These routines dump out a trie in a somewhat readable format.
- The _interim_ variants are used for debugging the interim
- tables that are used to generate the final compressed
- representation which is what dump_trie expects.
-
- Part of the reason for their existence is to provide a form
- of documentation as to how the different representations function.
-
-*/
-
-/*
- Dumps the final compressed table form of the trie to Perl_debug_log.
- Used for debugging make_trie().
-*/
-
-STATIC void
-S_dump_trie(pTHX_ const struct _reg_trie_data *trie, HV *widecharmap,
- AV *revcharmap, U32 depth)
-{
- U32 state;
- SV *sv=sv_newmortal();
- int colwidth= widecharmap ? 6 : 4;
- U16 word;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_DUMP_TRIE;
-
- PerlIO_printf( Perl_debug_log, "%*sChar : %-6s%-6s%-4s ",
- (int)depth * 2 + 2,"",
- "Match","Base","Ofs" );
-
- for( state = 0 ; state < trie->uniquecharcount ; state++ ) {
- SV ** const tmp = av_fetch( revcharmap, state, 0);
- if ( tmp ) {
- PerlIO_printf( Perl_debug_log, "%*s",
- colwidth,
- pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
- PL_colors[0], PL_colors[1],
- (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
- PERL_PV_ESCAPE_FIRSTCHAR
- )
- );
- }
- }
- PerlIO_printf( Perl_debug_log, "\n%*sState|-----------------------",
- (int)depth * 2 + 2,"");
-
- for( state = 0 ; state < trie->uniquecharcount ; state++ )
- PerlIO_printf( Perl_debug_log, "%.*s", colwidth, "--------");
- PerlIO_printf( Perl_debug_log, "\n");
-
- for( state = 1 ; state < trie->statecount ; state++ ) {
- const U32 base = trie->states[ state ].trans.base;
-
- PerlIO_printf( Perl_debug_log, "%*s#%4"UVXf"|",
- (int)depth * 2 + 2,"", (UV)state);
-
- if ( trie->states[ state ].wordnum ) {
- PerlIO_printf( Perl_debug_log, " W%4X",
- trie->states[ state ].wordnum );
- } else {
- PerlIO_printf( Perl_debug_log, "%6s", "" );
- }
-
- PerlIO_printf( Perl_debug_log, " @%4"UVXf" ", (UV)base );
-
- if ( base ) {
- U32 ofs = 0;
-
- while( ( base + ofs < trie->uniquecharcount ) ||
- ( base + ofs - trie->uniquecharcount < trie->lasttrans
- && trie->trans[ base + ofs - trie->uniquecharcount ].check
- != state))
- ofs++;
-
- PerlIO_printf( Perl_debug_log, "+%2"UVXf"[ ", (UV)ofs);
-
- for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
- if ( ( base + ofs >= trie->uniquecharcount )
- && ( base + ofs - trie->uniquecharcount
- < trie->lasttrans )
- && trie->trans[ base + ofs
- - trie->uniquecharcount ].check == state )
- {
- PerlIO_printf( Perl_debug_log, "%*"UVXf,
- colwidth,
- (UV)trie->trans[ base + ofs
- - trie->uniquecharcount ].next );
- } else {
- PerlIO_printf( Perl_debug_log, "%*s",colwidth," ." );
- }
- }
-
- PerlIO_printf( Perl_debug_log, "]");
-
- }
- PerlIO_printf( Perl_debug_log, "\n" );
- }
- PerlIO_printf(Perl_debug_log, "%*sword_info N:(prev,len)=",
- (int)depth*2, "");
- for (word=1; word <= trie->wordcount; word++) {
- PerlIO_printf(Perl_debug_log, " %d:(%d,%d)",
- (int)word, (int)(trie->wordinfo[word].prev),
- (int)(trie->wordinfo[word].len));
- }
- PerlIO_printf(Perl_debug_log, "\n" );
-}
-/*
- Dumps a fully constructed but uncompressed trie in list form.
- List tries normally only are used for construction when the number of
- possible chars (trie->uniquecharcount) is very high.
- Used for debugging make_trie().
-*/
-STATIC void
-S_dump_trie_interim_list(pTHX_ const struct _reg_trie_data *trie,
- HV *widecharmap, AV *revcharmap, U32 next_alloc,
- U32 depth)
-{
- U32 state;
- SV *sv=sv_newmortal();
- int colwidth= widecharmap ? 6 : 4;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_DUMP_TRIE_INTERIM_LIST;
-
- /* print out the table precompression. */
- PerlIO_printf( Perl_debug_log, "%*sState :Word | Transition Data\n%*s%s",
- (int)depth * 2 + 2,"", (int)depth * 2 + 2,"",
- "------:-----+-----------------\n" );
-
- for( state=1 ; state < next_alloc ; state ++ ) {
- U16 charid;
-
- PerlIO_printf( Perl_debug_log, "%*s %4"UVXf" :",
- (int)depth * 2 + 2,"", (UV)state );
- if ( ! trie->states[ state ].wordnum ) {
- PerlIO_printf( Perl_debug_log, "%5s| ","");
- } else {
- PerlIO_printf( Perl_debug_log, "W%4x| ",
- trie->states[ state ].wordnum
- );
- }
- for( charid = 1 ; charid <= TRIE_LIST_USED( state ) ; charid++ ) {
- SV ** const tmp = av_fetch( revcharmap,
- TRIE_LIST_ITEM(state,charid).forid, 0);
- if ( tmp ) {
- PerlIO_printf( Perl_debug_log, "%*s:%3X=%4"UVXf" | ",
- colwidth,
- pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp),
- colwidth,
- PL_colors[0], PL_colors[1],
- (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0)
- | PERL_PV_ESCAPE_FIRSTCHAR
- ) ,
- TRIE_LIST_ITEM(state,charid).forid,
- (UV)TRIE_LIST_ITEM(state,charid).newstate
- );
- if (!(charid % 10))
- PerlIO_printf(Perl_debug_log, "\n%*s| ",
- (int)((depth * 2) + 14), "");
- }
- }
- PerlIO_printf( Perl_debug_log, "\n");
- }
-}
-
-/*
- Dumps a fully constructed but uncompressed trie in table form.
- This is the normal DFA style state transition table, with a few
- twists to facilitate compression later.
- Used for debugging make_trie().
-*/
-STATIC void
-S_dump_trie_interim_table(pTHX_ const struct _reg_trie_data *trie,
- HV *widecharmap, AV *revcharmap, U32 next_alloc,
- U32 depth)
-{
- U32 state;
- U16 charid;
- SV *sv=sv_newmortal();
- int colwidth= widecharmap ? 6 : 4;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_DUMP_TRIE_INTERIM_TABLE;
-
- /*
- print out the table precompression so that we can do a visual check
- that they are identical.
- */
-
- PerlIO_printf( Perl_debug_log, "%*sChar : ",(int)depth * 2 + 2,"" );
-
- for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
- SV ** const tmp = av_fetch( revcharmap, charid, 0);
- if ( tmp ) {
- PerlIO_printf( Perl_debug_log, "%*s",
- colwidth,
- pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), colwidth,
- PL_colors[0], PL_colors[1],
- (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
- PERL_PV_ESCAPE_FIRSTCHAR
- )
- );
- }
- }
-
- PerlIO_printf( Perl_debug_log, "\n%*sState+-",(int)depth * 2 + 2,"" );
-
- for( charid=0 ; charid < trie->uniquecharcount ; charid++ ) {
- PerlIO_printf( Perl_debug_log, "%.*s", colwidth,"--------");
- }
-
- PerlIO_printf( Perl_debug_log, "\n" );
-
- for( state=1 ; state < next_alloc ; state += trie->uniquecharcount ) {
-
- PerlIO_printf( Perl_debug_log, "%*s%4"UVXf" : ",
- (int)depth * 2 + 2,"",
- (UV)TRIE_NODENUM( state ) );
-
- for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
- UV v=(UV)SAFE_TRIE_NODENUM( trie->trans[ state + charid ].next );
- if (v)
- PerlIO_printf( Perl_debug_log, "%*"UVXf, colwidth, v );
- else
- PerlIO_printf( Perl_debug_log, "%*s", colwidth, "." );
- }
- if ( ! trie->states[ TRIE_NODENUM( state ) ].wordnum ) {
- PerlIO_printf( Perl_debug_log, " (%4"UVXf")\n",
- (UV)trie->trans[ state ].check );
- } else {
- PerlIO_printf( Perl_debug_log, " (%4"UVXf") W%4X\n",
- (UV)trie->trans[ state ].check,
- trie->states[ TRIE_NODENUM( state ) ].wordnum );
- }
- }
-}
-
-#endif
-
-
-/* make_trie(startbranch,first,last,tail,word_count,flags,depth)
- startbranch: the first branch in the whole branch sequence
- first : start branch of sequence of branch-exact nodes.
- May be the same as startbranch
- last : Thing following the last branch.
- May be the same as tail.
- tail : item following the branch sequence
- count : words in the sequence
- flags : currently the OP() type we will be building one of /EXACT(|F|FA|FU|FU_SS)/
- depth : indent depth
-
-Inplace optimizes a sequence of 2 or more Branch-Exact nodes into a TRIE node.
-
-A trie is an N'ary tree where the branches are determined by digital
-decomposition of the key. IE, at the root node you look up the 1st character and
-follow that branch repeat until you find the end of the branches. Nodes can be
-marked as "accepting" meaning they represent a complete word. Eg:
-
- /he|she|his|hers/
-
-would convert into the following structure. Numbers represent states, letters
-following numbers represent valid transitions on the letter from that state, if
-the number is in square brackets it represents an accepting state, otherwise it
-will be in parenthesis.
-
- +-h->+-e->[3]-+-r->(8)-+-s->[9]
- | |
- | (2)
- | |
- (1) +-i->(6)-+-s->[7]
- |
- +-s->(3)-+-h->(4)-+-e->[5]
-
- Accept Word Mapping: 3=>1 (he),5=>2 (she), 7=>3 (his), 9=>4 (hers)
-
-This shows that when matching against the string 'hers' we will begin at state 1
-read 'h' and move to state 2, read 'e' and move to state 3 which is accepting,
-then read 'r' and go to state 8 followed by 's' which takes us to state 9 which
-is also accepting. Thus we know that we can match both 'he' and 'hers' with a
-single traverse. We store a mapping from accepting to state to which word was
-matched, and then when we have multiple possibilities we try to complete the
-rest of the regex in the order in which they occured in the alternation.
-
-The only prior NFA like behaviour that would be changed by the TRIE support is
-the silent ignoring of duplicate alternations which are of the form:
-
- / (DUPE|DUPE) X? (?{ ... }) Y /x
-
-Thus EVAL blocks following a trie may be called a different number of times with
-and without the optimisation. With the optimisations dupes will be silently
-ignored. This inconsistent behaviour of EVAL type nodes is well established as
-the following demonstrates:
-
- 'words'=~/(word|word|word)(?{ print $1 })[xyz]/
-
-which prints out 'word' three times, but
-
- 'words'=~/(word|word|word)(?{ print $1 })S/
-
-which doesnt print it out at all. This is due to other optimisations kicking in.
-
-Example of what happens on a structural level:
-
-The regexp /(ac|ad|ab)+/ will produce the following debug output:
-
- 1: CURLYM[1] {1,32767}(18)
- 5: BRANCH(8)
- 6: EXACT <ac>(16)
- 8: BRANCH(11)
- 9: EXACT <ad>(16)
- 11: BRANCH(14)
- 12: EXACT <ab>(16)
- 16: SUCCEED(0)
- 17: NOTHING(18)
- 18: END(0)
-
-This would be optimizable with startbranch=5, first=5, last=16, tail=16
-and should turn into:
-
- 1: CURLYM[1] {1,32767}(18)
- 5: TRIE(16)
- [Words:3 Chars Stored:6 Unique Chars:4 States:5 NCP:1]
- <ac>
- <ad>
- <ab>
- 16: SUCCEED(0)
- 17: NOTHING(18)
- 18: END(0)
-
-Cases where tail != last would be like /(?foo|bar)baz/:
-
- 1: BRANCH(4)
- 2: EXACT <foo>(8)
- 4: BRANCH(7)
- 5: EXACT <bar>(8)
- 7: TAIL(8)
- 8: EXACT <baz>(10)
- 10: END(0)
-
-which would be optimizable with startbranch=1, first=1, last=7, tail=8
-and would end up looking like:
-
- 1: TRIE(8)
- [Words:2 Chars Stored:6 Unique Chars:5 States:7 NCP:1]
- <foo>
- <bar>
- 7: TAIL(8)
- 8: EXACT <baz>(10)
- 10: END(0)
-
- d = uvchr_to_utf8_flags(d, uv, 0);
-
-is the recommended Unicode-aware way of saying
-
- *(d++) = uv;
-*/
-
-#define TRIE_STORE_REVCHAR(val) \
- STMT_START { \
- if (UTF) { \
- SV *zlopp = newSV(7); /* XXX: optimize me */ \
- unsigned char *flrbbbbb = (unsigned char *) SvPVX(zlopp); \
- unsigned const char *const kapow = uvchr_to_utf8(flrbbbbb, val); \
- SvCUR_set(zlopp, kapow - flrbbbbb); \
- SvPOK_on(zlopp); \
- SvUTF8_on(zlopp); \
- av_push(revcharmap, zlopp); \
- } else { \
- char ooooff = (char)val; \
- av_push(revcharmap, newSVpvn(&ooooff, 1)); \
- } \
- } STMT_END
-
-/* This gets the next character from the input, folding it if not already
- * folded. */
-#define TRIE_READ_CHAR STMT_START { \
- wordlen++; \
- if ( UTF ) { \
- /* if it is UTF then it is either already folded, or does not need \
- * folding */ \
- uvc = valid_utf8_to_uvchr( (const U8*) uc, &len); \
- } \
- else if (folder == PL_fold_latin1) { \
- /* This folder implies Unicode rules, which in the range expressible \
- * by not UTF is the lower case, with the two exceptions, one of \
- * which should have been taken care of before calling this */ \
- assert(*uc != LATIN_SMALL_LETTER_SHARP_S); \
- uvc = toLOWER_L1(*uc); \
- if (UNLIKELY(uvc == MICRO_SIGN)) uvc = GREEK_SMALL_LETTER_MU; \
- len = 1; \
- } else { \
- /* raw data, will be folded later if needed */ \
- uvc = (U32)*uc; \
- len = 1; \
- } \
-} STMT_END
-
-
-
-#define TRIE_LIST_PUSH(state,fid,ns) STMT_START { \
- if ( TRIE_LIST_CUR( state ) >=TRIE_LIST_LEN( state ) ) { \
- U32 ging = TRIE_LIST_LEN( state ) *= 2; \
- Renew( trie->states[ state ].trans.list, ging, reg_trie_trans_le ); \
- } \
- TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).forid = fid; \
- TRIE_LIST_ITEM( state, TRIE_LIST_CUR( state ) ).newstate = ns; \
- TRIE_LIST_CUR( state )++; \
-} STMT_END
-
-#define TRIE_LIST_NEW(state) STMT_START { \
- Newxz( trie->states[ state ].trans.list, \
- 4, reg_trie_trans_le ); \
- TRIE_LIST_CUR( state ) = 1; \
- TRIE_LIST_LEN( state ) = 4; \
-} STMT_END
-
-#define TRIE_HANDLE_WORD(state) STMT_START { \
- U16 dupe= trie->states[ state ].wordnum; \
- regnode * const noper_next = regnext( noper ); \
- \
- DEBUG_r({ \
- /* store the word for dumping */ \
- SV* tmp; \
- if (OP(noper) != NOTHING) \
- tmp = newSVpvn_utf8(STRING(noper), STR_LEN(noper), UTF); \
- else \
- tmp = newSVpvn_utf8( "", 0, UTF ); \
- av_push( trie_words, tmp ); \
- }); \
- \
- curword++; \
- trie->wordinfo[curword].prev = 0; \
- trie->wordinfo[curword].len = wordlen; \
- trie->wordinfo[curword].accept = state; \
- \
- if ( noper_next < tail ) { \
- if (!trie->jump) \
- trie->jump = (U16 *) PerlMemShared_calloc( word_count + 1, \
- sizeof(U16) ); \
- trie->jump[curword] = (U16)(noper_next - convert); \
- if (!jumper) \
- jumper = noper_next; \
- if (!nextbranch) \
- nextbranch= regnext(cur); \
- } \
- \
- if ( dupe ) { \
- /* It's a dupe. Pre-insert into the wordinfo[].prev */\
- /* chain, so that when the bits of chain are later */\
- /* linked together, the dups appear in the chain */\
- trie->wordinfo[curword].prev = trie->wordinfo[dupe].prev; \
- trie->wordinfo[dupe].prev = curword; \
- } else { \
- /* we haven't inserted this word yet. */ \
- trie->states[ state ].wordnum = curword; \
- } \
-} STMT_END
-
-
-#define TRIE_TRANS_STATE(state,base,ucharcount,charid,special) \
- ( ( base + charid >= ucharcount \
- && base + charid < ubound \
- && state == trie->trans[ base - ucharcount + charid ].check \
- && trie->trans[ base - ucharcount + charid ].next ) \
- ? trie->trans[ base - ucharcount + charid ].next \
- : ( state==1 ? special : 0 ) \
- )
-
-#define MADE_TRIE 1
-#define MADE_JUMP_TRIE 2
-#define MADE_EXACT_TRIE 4
-
-STATIC I32
-S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch,
- regnode *first, regnode *last, regnode *tail,
- U32 word_count, U32 flags, U32 depth)
-{
- /* first pass, loop through and scan words */
- reg_trie_data *trie;
- HV *widecharmap = NULL;
- AV *revcharmap = newAV();
- regnode *cur;
- STRLEN len = 0;
- UV uvc = 0;
- U16 curword = 0;
- U32 next_alloc = 0;
- regnode *jumper = NULL;
- regnode *nextbranch = NULL;
- regnode *convert = NULL;
- U32 *prev_states; /* temp array mapping each state to previous one */
- /* we just use folder as a flag in utf8 */
- const U8 * folder = NULL;
-
-#ifdef DEBUGGING
- const U32 data_slot = add_data( pRExC_state, STR_WITH_LEN("tuuu"));
- AV *trie_words = NULL;
- /* along with revcharmap, this only used during construction but both are
- * useful during debugging so we store them in the struct when debugging.
- */
-#else
- const U32 data_slot = add_data( pRExC_state, STR_WITH_LEN("tu"));
- STRLEN trie_charcount=0;
-#endif
- SV *re_trie_maxbuff;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_MAKE_TRIE;
-#ifndef DEBUGGING
- PERL_UNUSED_ARG(depth);
-#endif
-
- switch (flags) {
- case EXACT: break;
- case EXACTFA:
- case EXACTFU_SS:
- case EXACTFU: folder = PL_fold_latin1; break;
- case EXACTF: folder = PL_fold; break;
- default: Perl_croak( aTHX_ "panic! In trie construction, unknown node type %u %s", (unsigned) flags, PL_reg_name[flags] );
- }
-
- trie = (reg_trie_data *) PerlMemShared_calloc( 1, sizeof(reg_trie_data) );
- trie->refcount = 1;
- trie->startstate = 1;
- trie->wordcount = word_count;
- RExC_rxi->data->data[ data_slot ] = (void*)trie;
- trie->charmap = (U16 *) PerlMemShared_calloc( 256, sizeof(U16) );
- if (flags == EXACT)
- trie->bitmap = (char *) PerlMemShared_calloc( ANYOF_BITMAP_SIZE, 1 );
- trie->wordinfo = (reg_trie_wordinfo *) PerlMemShared_calloc(
- trie->wordcount+1, sizeof(reg_trie_wordinfo));
-
- DEBUG_r({
- trie_words = newAV();
- });
-
- re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
- assert(re_trie_maxbuff);
- if (!SvIOK(re_trie_maxbuff)) {
- sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
- }
- DEBUG_TRIE_COMPILE_r({
- PerlIO_printf( Perl_debug_log,
- "%*smake_trie start==%d, first==%d, last==%d, tail==%d depth=%d\n",
- (int)depth * 2 + 2, "",
- REG_NODE_NUM(startbranch),REG_NODE_NUM(first),
- REG_NODE_NUM(last), REG_NODE_NUM(tail), (int)depth);
- });
-
- /* Find the node we are going to overwrite */
- if ( first == startbranch && OP( last ) != BRANCH ) {
- /* whole branch chain */
- convert = first;
- } else {
- /* branch sub-chain */
- convert = NEXTOPER( first );
- }
-
- /* -- First loop and Setup --
-
- We first traverse the branches and scan each word to determine if it
- contains widechars, and how many unique chars there are, this is
- important as we have to build a table with at least as many columns as we
- have unique chars.
-
- We use an array of integers to represent the character codes 0..255
- (trie->charmap) and we use a an HV* to store Unicode characters. We use
- the native representation of the character value as the key and IV's for
- the coded index.
-
- *TODO* If we keep track of how many times each character is used we can
- remap the columns so that the table compression later on is more
- efficient in terms of memory by ensuring the most common value is in the
- middle and the least common are on the outside. IMO this would be better
- than a most to least common mapping as theres a decent chance the most
- common letter will share a node with the least common, meaning the node
- will not be compressible. With a middle is most common approach the worst
- case is when we have the least common nodes twice.
-
- */
-
- for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
- regnode *noper = NEXTOPER( cur );
- const U8 *uc = (U8*)STRING( noper );
- const U8 *e = uc + STR_LEN( noper );
- int foldlen = 0;
- U32 wordlen = 0; /* required init */
- STRLEN minchars = 0;
- STRLEN maxchars = 0;
- bool set_bit = trie->bitmap ? 1 : 0; /*store the first char in the
- bitmap?*/
-
- if (OP(noper) == NOTHING) {
- regnode *noper_next= regnext(noper);
- if (noper_next != tail && OP(noper_next) == flags) {
- noper = noper_next;
- uc= (U8*)STRING(noper);
- e= uc + STR_LEN(noper);
- trie->minlen= STR_LEN(noper);
- } else {
- trie->minlen= 0;
- continue;
- }
- }
-
- if ( set_bit ) { /* bitmap only alloced when !(UTF&&Folding) */
- TRIE_BITMAP_SET(trie,*uc); /* store the raw first byte
- regardless of encoding */
- if (OP( noper ) == EXACTFU_SS) {
- /* false positives are ok, so just set this */
- TRIE_BITMAP_SET(trie, LATIN_SMALL_LETTER_SHARP_S);
- }
- }
- for ( ; uc < e ; uc += len ) { /* Look at each char in the current
- branch */
- TRIE_CHARCOUNT(trie)++;
- TRIE_READ_CHAR;
-
- /* TRIE_READ_CHAR returns the current character, or its fold if /i
- * is in effect. Under /i, this character can match itself, or
- * anything that folds to it. If not under /i, it can match just
- * itself. Most folds are 1-1, for example k, K, and KELVIN SIGN
- * all fold to k, and all are single characters. But some folds
- * expand to more than one character, so for example LATIN SMALL
- * LIGATURE FFI folds to the three character sequence 'ffi'. If
- * the string beginning at 'uc' is 'ffi', it could be matched by
- * three characters, or just by the one ligature character. (It
- * could also be matched by two characters: LATIN SMALL LIGATURE FF
- * followed by 'i', or by 'f' followed by LATIN SMALL LIGATURE FI).
- * (Of course 'I' and/or 'F' instead of 'i' and 'f' can also
- * match.) The trie needs to know the minimum and maximum number
- * of characters that could match so that it can use size alone to
- * quickly reject many match attempts. The max is simple: it is
- * the number of folded characters in this branch (since a fold is
- * never shorter than what folds to it. */
-
- maxchars++;
-
- /* And the min is equal to the max if not under /i (indicated by
- * 'folder' being NULL), or there are no multi-character folds. If
- * there is a multi-character fold, the min is incremented just
- * once, for the character that folds to the sequence. Each
- * character in the sequence needs to be added to the list below of
- * characters in the trie, but we count only the first towards the
- * min number of characters needed. This is done through the
- * variable 'foldlen', which is returned by the macros that look
- * for these sequences as the number of bytes the sequence
- * occupies. Each time through the loop, we decrement 'foldlen' by
- * how many bytes the current char occupies. Only when it reaches
- * 0 do we increment 'minchars' or look for another multi-character
- * sequence. */
- if (folder == NULL) {
- minchars++;
- }
- else if (foldlen > 0) {
- foldlen -= (UTF) ? UTF8SKIP(uc) : 1;
- }
- else {
- minchars++;
-
- /* See if *uc is the beginning of a multi-character fold. If
- * so, we decrement the length remaining to look at, to account
- * for the current character this iteration. (We can use 'uc'
- * instead of the fold returned by TRIE_READ_CHAR because for
- * non-UTF, the latin1_safe macro is smart enough to account
- * for all the unfolded characters, and because for UTF, the
- * string will already have been folded earlier in the
- * compilation process */
- if (UTF) {
- if ((foldlen = is_MULTI_CHAR_FOLD_utf8_safe(uc, e))) {
- foldlen -= UTF8SKIP(uc);
- }
- }
- else if ((foldlen = is_MULTI_CHAR_FOLD_latin1_safe(uc, e))) {
- foldlen--;
- }
- }
-
- /* The current character (and any potential folds) should be added
- * to the possible matching characters for this position in this
- * branch */
- if ( uvc < 256 ) {
- if ( folder ) {
- U8 folded= folder[ (U8) uvc ];
- if ( !trie->charmap[ folded ] ) {
- trie->charmap[ folded ]=( ++trie->uniquecharcount );
- TRIE_STORE_REVCHAR( folded );
- }
- }
- if ( !trie->charmap[ uvc ] ) {
- trie->charmap[ uvc ]=( ++trie->uniquecharcount );
- TRIE_STORE_REVCHAR( uvc );
- }
- if ( set_bit ) {
- /* store the codepoint in the bitmap, and its folded
- * equivalent. */
- TRIE_BITMAP_SET(trie, uvc);
-
- /* store the folded codepoint */
- if ( folder ) TRIE_BITMAP_SET(trie, folder[(U8) uvc ]);
-
- if ( !UTF ) {
- /* store first byte of utf8 representation of
- variant codepoints */
- if (! UVCHR_IS_INVARIANT(uvc)) {
- TRIE_BITMAP_SET(trie, UTF8_TWO_BYTE_HI(uvc));
- }
- }
- set_bit = 0; /* We've done our bit :-) */
- }
- } else {
-
- /* XXX We could come up with the list of code points that fold
- * to this using PL_utf8_foldclosures, except not for
- * multi-char folds, as there may be multiple combinations
- * there that could work, which needs to wait until runtime to
- * resolve (The comment about LIGATURE FFI above is such an
- * example */
-
- SV** svpp;
- if ( !widecharmap )
- widecharmap = newHV();
-
- svpp = hv_fetch( widecharmap, (char*)&uvc, sizeof( UV ), 1 );
-
- if ( !svpp )
- Perl_croak( aTHX_ "error creating/fetching widecharmap entry for 0x%"UVXf, uvc );
-
- if ( !SvTRUE( *svpp ) ) {
- sv_setiv( *svpp, ++trie->uniquecharcount );
- TRIE_STORE_REVCHAR(uvc);
- }
- }
- } /* end loop through characters in this branch of the trie */
-
- /* We take the min and max for this branch and combine to find the min
- * and max for all branches processed so far */
- if( cur == first ) {
- trie->minlen = minchars;
- trie->maxlen = maxchars;
- } else if (minchars < trie->minlen) {
- trie->minlen = minchars;
- } else if (maxchars > trie->maxlen) {
- trie->maxlen = maxchars;
- }
- } /* end first pass */
- DEBUG_TRIE_COMPILE_r(
- PerlIO_printf( Perl_debug_log,
- "%*sTRIE(%s): W:%d C:%d Uq:%d Min:%d Max:%d\n",
- (int)depth * 2 + 2,"",
- ( widecharmap ? "UTF8" : "NATIVE" ), (int)word_count,
- (int)TRIE_CHARCOUNT(trie), trie->uniquecharcount,
- (int)trie->minlen, (int)trie->maxlen )
- );
-
- /*
- We now know what we are dealing with in terms of unique chars and
- string sizes so we can calculate how much memory a naive
- representation using a flat table will take. If it's over a reasonable
- limit (as specified by ${^RE_TRIE_MAXBUF}) we use a more memory
- conservative but potentially much slower representation using an array
- of lists.
-
- At the end we convert both representations into the same compressed
- form that will be used in regexec.c for matching with. The latter
- is a form that cannot be used to construct with but has memory
- properties similar to the list form and access properties similar
- to the table form making it both suitable for fast searches and
- small enough that its feasable to store for the duration of a program.
-
- See the comment in the code where the compressed table is produced
- inplace from the flat tabe representation for an explanation of how
- the compression works.
-
- */
-
-
- Newx(prev_states, TRIE_CHARCOUNT(trie) + 2, U32);
- prev_states[1] = 0;
-
- if ( (IV)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount + 1)
- > SvIV(re_trie_maxbuff) )
- {
- /*
- Second Pass -- Array Of Lists Representation
-
- Each state will be represented by a list of charid:state records
- (reg_trie_trans_le) the first such element holds the CUR and LEN
- points of the allocated array. (See defines above).
-
- We build the initial structure using the lists, and then convert
- it into the compressed table form which allows faster lookups
- (but cant be modified once converted).
- */
-
- STRLEN transcount = 1;
-
- DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
- "%*sCompiling trie using list compiler\n",
- (int)depth * 2 + 2, ""));
-
- trie->states = (reg_trie_state *)
- PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
- sizeof(reg_trie_state) );
- TRIE_LIST_NEW(1);
- next_alloc = 2;
-
- for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
-
- regnode *noper = NEXTOPER( cur );
- U8 *uc = (U8*)STRING( noper );
- const U8 *e = uc + STR_LEN( noper );
- U32 state = 1; /* required init */
- U16 charid = 0; /* sanity init */
- U32 wordlen = 0; /* required init */
-
- if (OP(noper) == NOTHING) {
- regnode *noper_next= regnext(noper);
- if (noper_next != tail && OP(noper_next) == flags) {
- noper = noper_next;
- uc= (U8*)STRING(noper);
- e= uc + STR_LEN(noper);
- }
- }
-
- if (OP(noper) != NOTHING) {
- for ( ; uc < e ; uc += len ) {
-
- TRIE_READ_CHAR;
-
- if ( uvc < 256 ) {
- charid = trie->charmap[ uvc ];
- } else {
- SV** const svpp = hv_fetch( widecharmap,
- (char*)&uvc,
- sizeof( UV ),
- 0);
- if ( !svpp ) {
- charid = 0;
- } else {
- charid=(U16)SvIV( *svpp );
- }
- }
- /* charid is now 0 if we dont know the char read, or
- * nonzero if we do */
- if ( charid ) {
-
- U16 check;
- U32 newstate = 0;
-
- charid--;
- if ( !trie->states[ state ].trans.list ) {
- TRIE_LIST_NEW( state );
- }
- for ( check = 1;
- check <= TRIE_LIST_USED( state );
- check++ )
- {
- if ( TRIE_LIST_ITEM( state, check ).forid
- == charid )
- {
- newstate = TRIE_LIST_ITEM( state, check ).newstate;
- break;
- }
- }
- if ( ! newstate ) {
- newstate = next_alloc++;
- prev_states[newstate] = state;
- TRIE_LIST_PUSH( state, charid, newstate );
- transcount++;
- }
- state = newstate;
- } else {
- Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
- }
- }
- }
- TRIE_HANDLE_WORD(state);
-
- } /* end second pass */
-
- /* next alloc is the NEXT state to be allocated */
- trie->statecount = next_alloc;
- trie->states = (reg_trie_state *)
- PerlMemShared_realloc( trie->states,
- next_alloc
- * sizeof(reg_trie_state) );
-
- /* and now dump it out before we compress it */
- DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_list(trie, widecharmap,
- revcharmap, next_alloc,
- depth+1)
- );
-
- trie->trans = (reg_trie_trans *)
- PerlMemShared_calloc( transcount, sizeof(reg_trie_trans) );
- {
- U32 state;
- U32 tp = 0;
- U32 zp = 0;
-
-
- for( state=1 ; state < next_alloc ; state ++ ) {
- U32 base=0;
-
- /*
- DEBUG_TRIE_COMPILE_MORE_r(
- PerlIO_printf( Perl_debug_log, "tp: %d zp: %d ",tp,zp)
- );
- */
-
- if (trie->states[state].trans.list) {
- U16 minid=TRIE_LIST_ITEM( state, 1).forid;
- U16 maxid=minid;
- U16 idx;
-
- for( idx = 2 ; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
- const U16 forid = TRIE_LIST_ITEM( state, idx).forid;
- if ( forid < minid ) {
- minid=forid;
- } else if ( forid > maxid ) {
- maxid=forid;
- }
- }
- if ( transcount < tp + maxid - minid + 1) {
- transcount *= 2;
- trie->trans = (reg_trie_trans *)
- PerlMemShared_realloc( trie->trans,
- transcount
- * sizeof(reg_trie_trans) );
- Zero( trie->trans + (transcount / 2),
- transcount / 2,
- reg_trie_trans );
- }
- base = trie->uniquecharcount + tp - minid;
- if ( maxid == minid ) {
- U32 set = 0;
- for ( ; zp < tp ; zp++ ) {
- if ( ! trie->trans[ zp ].next ) {
- base = trie->uniquecharcount + zp - minid;
- trie->trans[ zp ].next = TRIE_LIST_ITEM( state,
- 1).newstate;
- trie->trans[ zp ].check = state;
- set = 1;
- break;
- }
- }
- if ( !set ) {
- trie->trans[ tp ].next = TRIE_LIST_ITEM( state,
- 1).newstate;
- trie->trans[ tp ].check = state;
- tp++;
- zp = tp;
- }
- } else {
- for ( idx=1; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
- const U32 tid = base
- - trie->uniquecharcount
- + TRIE_LIST_ITEM( state, idx ).forid;
- trie->trans[ tid ].next = TRIE_LIST_ITEM( state,
- idx ).newstate;
- trie->trans[ tid ].check = state;
- }
- tp += ( maxid - minid + 1 );
- }
- Safefree(trie->states[ state ].trans.list);
- }
- /*
- DEBUG_TRIE_COMPILE_MORE_r(
- PerlIO_printf( Perl_debug_log, " base: %d\n",base);
- );
- */
- trie->states[ state ].trans.base=base;
- }
- trie->lasttrans = tp + 1;
- }
- } else {
- /*
- Second Pass -- Flat Table Representation.
-
- we dont use the 0 slot of either trans[] or states[] so we add 1 to
- each. We know that we will need Charcount+1 trans at most to store
- the data (one row per char at worst case) So we preallocate both
- structures assuming worst case.
-
- We then construct the trie using only the .next slots of the entry
- structs.
-
- We use the .check field of the first entry of the node temporarily
- to make compression both faster and easier by keeping track of how
- many non zero fields are in the node.
-
- Since trans are numbered from 1 any 0 pointer in the table is a FAIL
- transition.
-
- There are two terms at use here: state as a TRIE_NODEIDX() which is
- a number representing the first entry of the node, and state as a
- TRIE_NODENUM() which is the trans number. state 1 is TRIE_NODEIDX(1)
- and TRIE_NODENUM(1), state 2 is TRIE_NODEIDX(2) and TRIE_NODENUM(3)
- if there are 2 entrys per node. eg:
-
- A B A B
- 1. 2 4 1. 3 7
- 2. 0 3 3. 0 5
- 3. 0 0 5. 0 0
- 4. 0 0 7. 0 0
-
- The table is internally in the right hand, idx form. However as we
- also have to deal with the states array which is indexed by nodenum
- we have to use TRIE_NODENUM() to convert.
-
- */
- DEBUG_TRIE_COMPILE_MORE_r( PerlIO_printf( Perl_debug_log,
- "%*sCompiling trie using table compiler\n",
- (int)depth * 2 + 2, ""));
-
- trie->trans = (reg_trie_trans *)
- PerlMemShared_calloc( ( TRIE_CHARCOUNT(trie) + 1 )
- * trie->uniquecharcount + 1,
- sizeof(reg_trie_trans) );
- trie->states = (reg_trie_state *)
- PerlMemShared_calloc( TRIE_CHARCOUNT(trie) + 2,
- sizeof(reg_trie_state) );
- next_alloc = trie->uniquecharcount + 1;
-
-
- for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
-
- regnode *noper = NEXTOPER( cur );
- const U8 *uc = (U8*)STRING( noper );
- const U8 *e = uc + STR_LEN( noper );
-
- U32 state = 1; /* required init */
-
- U16 charid = 0; /* sanity init */
- U32 accept_state = 0; /* sanity init */
-
- U32 wordlen = 0; /* required init */
-
- if (OP(noper) == NOTHING) {
- regnode *noper_next= regnext(noper);
- if (noper_next != tail && OP(noper_next) == flags) {
- noper = noper_next;
- uc= (U8*)STRING(noper);
- e= uc + STR_LEN(noper);
- }
- }
-
- if ( OP(noper) != NOTHING ) {
- for ( ; uc < e ; uc += len ) {
-
- TRIE_READ_CHAR;
-
- if ( uvc < 256 ) {
- charid = trie->charmap[ uvc ];
- } else {
- SV* const * const svpp = hv_fetch( widecharmap,
- (char*)&uvc,
- sizeof( UV ),
- 0);
- charid = svpp ? (U16)SvIV(*svpp) : 0;
- }
- if ( charid ) {
- charid--;
- if ( !trie->trans[ state + charid ].next ) {
- trie->trans[ state + charid ].next = next_alloc;
- trie->trans[ state ].check++;
- prev_states[TRIE_NODENUM(next_alloc)]
- = TRIE_NODENUM(state);
- next_alloc += trie->uniquecharcount;
- }
- state = trie->trans[ state + charid ].next;
- } else {
- Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
- }
- /* charid is now 0 if we dont know the char read, or
- * nonzero if we do */
- }
- }
- accept_state = TRIE_NODENUM( state );
- TRIE_HANDLE_WORD(accept_state);
-
- } /* end second pass */
-
- /* and now dump it out before we compress it */
- DEBUG_TRIE_COMPILE_MORE_r(dump_trie_interim_table(trie, widecharmap,
- revcharmap,
- next_alloc, depth+1));
-
- {
- /*
- * Inplace compress the table.*
-
- For sparse data sets the table constructed by the trie algorithm will
- be mostly 0/FAIL transitions or to put it another way mostly empty.
- (Note that leaf nodes will not contain any transitions.)
-
- This algorithm compresses the tables by eliminating most such
- transitions, at the cost of a modest bit of extra work during lookup:
-
- - Each states[] entry contains a .base field which indicates the
- index in the state[] array wheres its transition data is stored.
-
- - If .base is 0 there are no valid transitions from that node.
-
- - If .base is nonzero then charid is added to it to find an entry in
- the trans array.
-
- -If trans[states[state].base+charid].check!=state then the
- transition is taken to be a 0/Fail transition. Thus if there are fail
- transitions at the front of the node then the .base offset will point
- somewhere inside the previous nodes data (or maybe even into a node
- even earlier), but the .check field determines if the transition is
- valid.
-
- XXX - wrong maybe?
- The following process inplace converts the table to the compressed
- table: We first do not compress the root node 1,and mark all its
- .check pointers as 1 and set its .base pointer as 1 as well. This
- allows us to do a DFA construction from the compressed table later,
- and ensures that any .base pointers we calculate later are greater
- than 0.
-
- - We set 'pos' to indicate the first entry of the second node.
-
- - We then iterate over the columns of the node, finding the first and
- last used entry at l and m. We then copy l..m into pos..(pos+m-l),
- and set the .check pointers accordingly, and advance pos
- appropriately and repreat for the next node. Note that when we copy
- the next pointers we have to convert them from the original
- NODEIDX form to NODENUM form as the former is not valid post
- compression.
-
- - If a node has no transitions used we mark its base as 0 and do not
- advance the pos pointer.
-
- - If a node only has one transition we use a second pointer into the
- structure to fill in allocated fail transitions from other states.
- This pointer is independent of the main pointer and scans forward
- looking for null transitions that are allocated to a state. When it
- finds one it writes the single transition into the "hole". If the
- pointer doesnt find one the single transition is appended as normal.
-
- - Once compressed we can Renew/realloc the structures to release the
- excess space.
-
- See "Table-Compression Methods" in sec 3.9 of the Red Dragon,
- specifically Fig 3.47 and the associated pseudocode.
-
- demq
- */
- const U32 laststate = TRIE_NODENUM( next_alloc );
- U32 state, charid;
- U32 pos = 0, zp=0;
- trie->statecount = laststate;
-
- for ( state = 1 ; state < laststate ; state++ ) {
- U8 flag = 0;
- const U32 stateidx = TRIE_NODEIDX( state );
- const U32 o_used = trie->trans[ stateidx ].check;
- U32 used = trie->trans[ stateidx ].check;
- trie->trans[ stateidx ].check = 0;
-
- for ( charid = 0;
- used && charid < trie->uniquecharcount;
- charid++ )
- {
- if ( flag || trie->trans[ stateidx + charid ].next ) {
- if ( trie->trans[ stateidx + charid ].next ) {
- if (o_used == 1) {
- for ( ; zp < pos ; zp++ ) {
- if ( ! trie->trans[ zp ].next ) {
- break;
- }
- }
- trie->states[ state ].trans.base
- = zp
- + trie->uniquecharcount
- - charid ;
- trie->trans[ zp ].next
- = SAFE_TRIE_NODENUM( trie->trans[ stateidx
- + charid ].next );
- trie->trans[ zp ].check = state;
- if ( ++zp > pos ) pos = zp;
- break;
- }
- used--;
- }
- if ( !flag ) {
- flag = 1;
- trie->states[ state ].trans.base
- = pos + trie->uniquecharcount - charid ;
- }
- trie->trans[ pos ].next
- = SAFE_TRIE_NODENUM(
- trie->trans[ stateidx + charid ].next );
- trie->trans[ pos ].check = state;
- pos++;
- }
- }
- }
- trie->lasttrans = pos + 1;
- trie->states = (reg_trie_state *)
- PerlMemShared_realloc( trie->states, laststate
- * sizeof(reg_trie_state) );
- DEBUG_TRIE_COMPILE_MORE_r(
- PerlIO_printf( Perl_debug_log,
- "%*sAlloc: %d Orig: %"IVdf" elements, Final:%"IVdf". Savings of %%%5.2f\n",
- (int)depth * 2 + 2,"",
- (int)( ( TRIE_CHARCOUNT(trie) + 1 ) * trie->uniquecharcount
- + 1 ),
- (IV)next_alloc,
- (IV)pos,
- ( ( next_alloc - pos ) * 100 ) / (double)next_alloc );
- );
-
- } /* end table compress */
- }
- DEBUG_TRIE_COMPILE_MORE_r(
- PerlIO_printf(Perl_debug_log,
- "%*sStatecount:%"UVxf" Lasttrans:%"UVxf"\n",
- (int)depth * 2 + 2, "",
- (UV)trie->statecount,
- (UV)trie->lasttrans)
- );
- /* resize the trans array to remove unused space */
- trie->trans = (reg_trie_trans *)
- PerlMemShared_realloc( trie->trans, trie->lasttrans
- * sizeof(reg_trie_trans) );
-
- { /* Modify the program and insert the new TRIE node */
- U8 nodetype =(U8)(flags & 0xFF);
- char *str=NULL;
-
-#ifdef DEBUGGING
- regnode *optimize = NULL;
-#ifdef RE_TRACK_PATTERN_OFFSETS
-
- U32 mjd_offset = 0;
- U32 mjd_nodelen = 0;
-#endif /* RE_TRACK_PATTERN_OFFSETS */
-#endif /* DEBUGGING */
- /*
- This means we convert either the first branch or the first Exact,
- depending on whether the thing following (in 'last') is a branch
- or not and whther first is the startbranch (ie is it a sub part of
- the alternation or is it the whole thing.)
- Assuming its a sub part we convert the EXACT otherwise we convert
- the whole branch sequence, including the first.
- */
- /* Find the node we are going to overwrite */
- if ( first != startbranch || OP( last ) == BRANCH ) {
- /* branch sub-chain */
- NEXT_OFF( first ) = (U16)(last - first);
-#ifdef RE_TRACK_PATTERN_OFFSETS
- DEBUG_r({
- mjd_offset= Node_Offset((convert));
- mjd_nodelen= Node_Length((convert));
- });
-#endif
- /* whole branch chain */
- }
-#ifdef RE_TRACK_PATTERN_OFFSETS
- else {
- DEBUG_r({
- const regnode *nop = NEXTOPER( convert );
- mjd_offset= Node_Offset((nop));
- mjd_nodelen= Node_Length((nop));
- });
- }
- DEBUG_OPTIMISE_r(
- PerlIO_printf(Perl_debug_log,
- "%*sMJD offset:%"UVuf" MJD length:%"UVuf"\n",
- (int)depth * 2 + 2, "",
- (UV)mjd_offset, (UV)mjd_nodelen)
- );
-#endif
- /* But first we check to see if there is a common prefix we can
- split out as an EXACT and put in front of the TRIE node. */
- trie->startstate= 1;
- if ( trie->bitmap && !widecharmap && !trie->jump ) {
- U32 state;
- for ( state = 1 ; state < trie->statecount-1 ; state++ ) {
- U32 ofs = 0;
- I32 idx = -1;
- U32 count = 0;
- const U32 base = trie->states[ state ].trans.base;
-
- if ( trie->states[state].wordnum )
- count = 1;
-
- for ( ofs = 0 ; ofs < trie->uniquecharcount ; ofs++ ) {
- if ( ( base + ofs >= trie->uniquecharcount ) &&
- ( base + ofs - trie->uniquecharcount < trie->lasttrans ) &&
- trie->trans[ base + ofs - trie->uniquecharcount ].check == state )
- {
- if ( ++count > 1 ) {
- SV **tmp = av_fetch( revcharmap, ofs, 0);
- const U8 *ch = (U8*)SvPV_nolen_const( *tmp );
- if ( state == 1 ) break;
- if ( count == 2 ) {
- Zero(trie->bitmap, ANYOF_BITMAP_SIZE, char);
- DEBUG_OPTIMISE_r(
- PerlIO_printf(Perl_debug_log,
- "%*sNew Start State=%"UVuf" Class: [",
- (int)depth * 2 + 2, "",
- (UV)state));
- if (idx >= 0) {
- SV ** const tmp = av_fetch( revcharmap, idx, 0);
- const U8 * const ch = (U8*)SvPV_nolen_const( *tmp );
-
- TRIE_BITMAP_SET(trie,*ch);
- if ( folder )
- TRIE_BITMAP_SET(trie, folder[ *ch ]);
- DEBUG_OPTIMISE_r(
- PerlIO_printf(Perl_debug_log, "%s", (char*)ch)
- );
- }
- }
- TRIE_BITMAP_SET(trie,*ch);
- if ( folder )
- TRIE_BITMAP_SET(trie,folder[ *ch ]);
- DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"%s", ch));
- }
- idx = ofs;
- }
- }
- if ( count == 1 ) {
- SV **tmp = av_fetch( revcharmap, idx, 0);
- STRLEN len;
- char *ch = SvPV( *tmp, len );
- DEBUG_OPTIMISE_r({
- SV *sv=sv_newmortal();
- PerlIO_printf( Perl_debug_log,
- "%*sPrefix State: %"UVuf" Idx:%"UVuf" Char='%s'\n",
- (int)depth * 2 + 2, "",
- (UV)state, (UV)idx,
- pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 6,
- PL_colors[0], PL_colors[1],
- (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0) |
- PERL_PV_ESCAPE_FIRSTCHAR
- )
- );
- });
- if ( state==1 ) {
- OP( convert ) = nodetype;
- str=STRING(convert);
- STR_LEN(convert)=0;
- }
- STR_LEN(convert) += len;
- while (len--)
- *str++ = *ch++;
- } else {
-#ifdef DEBUGGING
- if (state>1)
- DEBUG_OPTIMISE_r(PerlIO_printf( Perl_debug_log,"]\n"));
-#endif
- break;
- }
- }
- trie->prefixlen = (state-1);
- if (str) {
- regnode *n = convert+NODE_SZ_STR(convert);
- NEXT_OFF(convert) = NODE_SZ_STR(convert);
- trie->startstate = state;
- trie->minlen -= (state - 1);
- trie->maxlen -= (state - 1);
-#ifdef DEBUGGING
- /* At least the UNICOS C compiler choked on this
- * being argument to DEBUG_r(), so let's just have
- * it right here. */
- if (
-#ifdef PERL_EXT_RE_BUILD
- 1
-#else
- DEBUG_r_TEST
-#endif
- ) {
- regnode *fix = convert;
- U32 word = trie->wordcount;
- mjd_nodelen++;
- Set_Node_Offset_Length(convert, mjd_offset, state - 1);
- while( ++fix < n ) {
- Set_Node_Offset_Length(fix, 0, 0);
- }
- while (word--) {
- SV ** const tmp = av_fetch( trie_words, word, 0 );
- if (tmp) {
- if ( STR_LEN(convert) <= SvCUR(*tmp) )
- sv_chop(*tmp, SvPV_nolen(*tmp) + STR_LEN(convert));
- else
- sv_chop(*tmp, SvPV_nolen(*tmp) + SvCUR(*tmp));
- }
- }
- }
-#endif
- if (trie->maxlen) {
- convert = n;
- } else {
- NEXT_OFF(convert) = (U16)(tail - convert);
- DEBUG_r(optimize= n);
- }
- }
- }
- if (!jumper)
- jumper = last;
- if ( trie->maxlen ) {
- NEXT_OFF( convert ) = (U16)(tail - convert);
- ARG_SET( convert, data_slot );
- /* Store the offset to the first unabsorbed branch in
- jump[0], which is otherwise unused by the jump logic.
- We use this when dumping a trie and during optimisation. */
- if (trie->jump)
- trie->jump[0] = (U16)(nextbranch - convert);
-
- /* If the start state is not accepting (meaning there is no empty string/NOTHING)
- * and there is a bitmap
- * and the first "jump target" node we found leaves enough room
- * then convert the TRIE node into a TRIEC node, with the bitmap
- * embedded inline in the opcode - this is hypothetically faster.
- */
- if ( !trie->states[trie->startstate].wordnum
- && trie->bitmap
- && ( (char *)jumper - (char *)convert) >= (int)sizeof(struct regnode_charclass) )
- {
- OP( convert ) = TRIEC;
- Copy(trie->bitmap, ((struct regnode_charclass *)convert)->bitmap, ANYOF_BITMAP_SIZE, char);
- PerlMemShared_free(trie->bitmap);
- trie->bitmap= NULL;
- } else
- OP( convert ) = TRIE;
-
- /* store the type in the flags */
- convert->flags = nodetype;
- DEBUG_r({
- optimize = convert
- + NODE_STEP_REGNODE
- + regarglen[ OP( convert ) ];
- });
- /* XXX We really should free up the resource in trie now,
- as we won't use them - (which resources?) dmq */
- }
- /* needed for dumping*/
- DEBUG_r(if (optimize) {
- regnode *opt = convert;
-
- while ( ++opt < optimize) {
- Set_Node_Offset_Length(opt,0,0);
- }
- /*
- Try to clean up some of the debris left after the
- optimisation.
- */
- while( optimize < jumper ) {
- mjd_nodelen += Node_Length((optimize));
- OP( optimize ) = OPTIMIZED;
- Set_Node_Offset_Length(optimize,0,0);
- optimize++;
- }
- Set_Node_Offset_Length(convert,mjd_offset,mjd_nodelen);
- });
- } /* end node insert */
- REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, convert);
-
- /* Finish populating the prev field of the wordinfo array. Walk back
- * from each accept state until we find another accept state, and if
- * so, point the first word's .prev field at the second word. If the
- * second already has a .prev field set, stop now. This will be the
- * case either if we've already processed that word's accept state,
- * or that state had multiple words, and the overspill words were
- * already linked up earlier.
- */
- {
- U16 word;
- U32 state;
- U16 prev;
-
- for (word=1; word <= trie->wordcount; word++) {
- prev = 0;
- if (trie->wordinfo[word].prev)
- continue;
- state = trie->wordinfo[word].accept;
- while (state) {
- state = prev_states[state];
- if (!state)
- break;
- prev = trie->states[state].wordnum;
- if (prev)
- break;
- }
- trie->wordinfo[word].prev = prev;
- }
- Safefree(prev_states);
- }
-
-
- /* and now dump out the compressed format */
- DEBUG_TRIE_COMPILE_r(dump_trie(trie, widecharmap, revcharmap, depth+1));
-
- RExC_rxi->data->data[ data_slot + 1 ] = (void*)widecharmap;
-#ifdef DEBUGGING
- RExC_rxi->data->data[ data_slot + TRIE_WORDS_OFFSET ] = (void*)trie_words;
- RExC_rxi->data->data[ data_slot + 3 ] = (void*)revcharmap;
-#else
- SvREFCNT_dec_NN(revcharmap);
-#endif
- return trie->jump
- ? MADE_JUMP_TRIE
- : trie->startstate>1
- ? MADE_EXACT_TRIE
- : MADE_TRIE;
-}
-
-STATIC regnode *
-S_construct_ahocorasick_from_trie(pTHX_ RExC_state_t *pRExC_state, regnode *source, U32 depth)
-{
-/* The Trie is constructed and compressed now so we can build a fail array if
- * it's needed
-
- This is basically the Aho-Corasick algorithm. Its from exercise 3.31 and
- 3.32 in the
- "Red Dragon" -- Compilers, principles, techniques, and tools. Aho, Sethi,
- Ullman 1985/88
- ISBN 0-201-10088-6
-
- We find the fail state for each state in the trie, this state is the longest
- proper suffix of the current state's 'word' that is also a proper prefix of
- another word in our trie. State 1 represents the word '' and is thus the
- default fail state. This allows the DFA not to have to restart after its
- tried and failed a word at a given point, it simply continues as though it
- had been matching the other word in the first place.
- Consider
- 'abcdgu'=~/abcdefg|cdgu/
- When we get to 'd' we are still matching the first word, we would encounter
- 'g' which would fail, which would bring us to the state representing 'd' in
- the second word where we would try 'g' and succeed, proceeding to match
- 'cdgu'.
- */
- /* add a fail transition */
- const U32 trie_offset = ARG(source);
- reg_trie_data *trie=(reg_trie_data *)RExC_rxi->data->data[trie_offset];
- U32 *q;
- const U32 ucharcount = trie->uniquecharcount;
- const U32 numstates = trie->statecount;
- const U32 ubound = trie->lasttrans + ucharcount;
- U32 q_read = 0;
- U32 q_write = 0;
- U32 charid;
- U32 base = trie->states[ 1 ].trans.base;
- U32 *fail;
- reg_ac_data *aho;
- const U32 data_slot = add_data( pRExC_state, STR_WITH_LEN("T"));
- regnode *stclass;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_CONSTRUCT_AHOCORASICK_FROM_TRIE;
- PERL_UNUSED_CONTEXT;
-#ifndef DEBUGGING
- PERL_UNUSED_ARG(depth);
-#endif
-
- if ( OP(source) == TRIE ) {
- struct regnode_1 *op = (struct regnode_1 *)
- PerlMemShared_calloc(1, sizeof(struct regnode_1));
- StructCopy(source,op,struct regnode_1);
- stclass = (regnode *)op;
- } else {
- struct regnode_charclass *op = (struct regnode_charclass *)
- PerlMemShared_calloc(1, sizeof(struct regnode_charclass));
- StructCopy(source,op,struct regnode_charclass);
- stclass = (regnode *)op;
- }
- OP(stclass)+=2; /* covert the TRIE type to its AHO-CORASICK equivalent */
-
- ARG_SET( stclass, data_slot );
- aho = (reg_ac_data *) PerlMemShared_calloc( 1, sizeof(reg_ac_data) );
- RExC_rxi->data->data[ data_slot ] = (void*)aho;
- aho->trie=trie_offset;
- aho->states=(reg_trie_state *)PerlMemShared_malloc( numstates * sizeof(reg_trie_state) );
- Copy( trie->states, aho->states, numstates, reg_trie_state );
- Newxz( q, numstates, U32);
- aho->fail = (U32 *) PerlMemShared_calloc( numstates, sizeof(U32) );
- aho->refcount = 1;
- fail = aho->fail;
- /* initialize fail[0..1] to be 1 so that we always have
- a valid final fail state */
- fail[ 0 ] = fail[ 1 ] = 1;
-
- for ( charid = 0; charid < ucharcount ; charid++ ) {
- const U32 newstate = TRIE_TRANS_STATE( 1, base, ucharcount, charid, 0 );
- if ( newstate ) {
- q[ q_write ] = newstate;
- /* set to point at the root */
- fail[ q[ q_write++ ] ]=1;
- }
- }
- while ( q_read < q_write) {
- const U32 cur = q[ q_read++ % numstates ];
- base = trie->states[ cur ].trans.base;
-
- for ( charid = 0 ; charid < ucharcount ; charid++ ) {
- const U32 ch_state = TRIE_TRANS_STATE( cur, base, ucharcount, charid, 1 );
- if (ch_state) {
- U32 fail_state = cur;
- U32 fail_base;
- do {
- fail_state = fail[ fail_state ];
- fail_base = aho->states[ fail_state ].trans.base;
- } while ( !TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 ) );
-
- fail_state = TRIE_TRANS_STATE( fail_state, fail_base, ucharcount, charid, 1 );
- fail[ ch_state ] = fail_state;
- if ( !aho->states[ ch_state ].wordnum && aho->states[ fail_state ].wordnum )
- {
- aho->states[ ch_state ].wordnum = aho->states[ fail_state ].wordnum;
- }
- q[ q_write++ % numstates] = ch_state;
- }
- }
- }
- /* restore fail[0..1] to 0 so that we "fall out" of the AC loop
- when we fail in state 1, this allows us to use the
- charclass scan to find a valid start char. This is based on the principle
- that theres a good chance the string being searched contains lots of stuff
- that cant be a start char.
- */
- fail[ 0 ] = fail[ 1 ] = 0;
- DEBUG_TRIE_COMPILE_r({
- PerlIO_printf(Perl_debug_log,
- "%*sStclass Failtable (%"UVuf" states): 0",
- (int)(depth * 2), "", (UV)numstates
- );
- for( q_read=1; q_read<numstates; q_read++ ) {
- PerlIO_printf(Perl_debug_log, ", %"UVuf, (UV)fail[q_read]);
- }
- PerlIO_printf(Perl_debug_log, "\n");
- });
- Safefree(q);
- /*RExC_seen |= REG_TRIEDFA_SEEN;*/
- return stclass;
-}
-
-
-#define DEBUG_PEEP(str,scan,depth) \
- DEBUG_OPTIMISE_r({if (scan){ \
- SV * const mysv=sv_newmortal(); \
- regnode *Next = regnext(scan); \
- regprop(RExC_rx, mysv, scan, NULL); \
- PerlIO_printf(Perl_debug_log, "%*s" str ">%3d: %s (%d)\n", \
- (int)depth*2, "", REG_NODE_NUM(scan), SvPV_nolen_const(mysv),\
- Next ? (REG_NODE_NUM(Next)) : 0 ); \
- }});
-
-
-/* The below joins as many adjacent EXACTish nodes as possible into a single
- * one. The regop may be changed if the node(s) contain certain sequences that
- * require special handling. The joining is only done if:
- * 1) there is room in the current conglomerated node to entirely contain the
- * next one.
- * 2) they are the exact same node type
- *
- * The adjacent nodes actually may be separated by NOTHING-kind nodes, and
- * these get optimized out
- *
- * If a node is to match under /i (folded), the number of characters it matches
- * can be different than its character length if it contains a multi-character
- * fold. *min_subtract is set to the total delta number of characters of the
- * input nodes.
- *
- * And *unfolded_multi_char is set to indicate whether or not the node contains
- * an unfolded multi-char fold. This happens when whether the fold is valid or
- * not won't be known until runtime; namely for EXACTF nodes that contain LATIN
- * SMALL LETTER SHARP S, as only if the target string being matched against
- * turns out to be UTF-8 is that fold valid; and also for EXACTFL nodes whose
- * folding rules depend on the locale in force at runtime. (Multi-char folds
- * whose components are all above the Latin1 range are not run-time locale
- * dependent, and have already been folded by the time this function is
- * called.)
- *
- * This is as good a place as any to discuss the design of handling these
- * multi-character fold sequences. It's been wrong in Perl for a very long
- * time. There are three code points in Unicode whose multi-character folds
- * were long ago discovered to mess things up. The previous designs for
- * dealing with these involved assigning a special node for them. This
- * approach doesn't always work, as evidenced by this example:
- * "\xDFs" =~ /s\xDF/ui # Used to fail before these patches
- * Both sides fold to "sss", but if the pattern is parsed to create a node that
- * would match just the \xDF, it won't be able to handle the case where a
- * successful match would have to cross the node's boundary. The new approach
- * that hopefully generally solves the problem generates an EXACTFU_SS node
- * that is "sss" in this case.
- *
- * It turns out that there are problems with all multi-character folds, and not
- * just these three. Now the code is general, for all such cases. The
- * approach taken is:
- * 1) This routine examines each EXACTFish node that could contain multi-
- * character folded sequences. Since a single character can fold into
- * such a sequence, the minimum match length for this node is less than
- * the number of characters in the node. This routine returns in
- * *min_subtract how many characters to subtract from the the actual
- * length of the string to get a real minimum match length; it is 0 if
- * there are no multi-char foldeds. This delta is used by the caller to
- * adjust the min length of the match, and the delta between min and max,
- * so that the optimizer doesn't reject these possibilities based on size
- * constraints.
- * 2) For the sequence involving the Sharp s (\xDF), the node type EXACTFU_SS
- * is used for an EXACTFU node that contains at least one "ss" sequence in
- * it. For non-UTF-8 patterns and strings, this is the only case where
- * there is a possible fold length change. That means that a regular
- * EXACTFU node without UTF-8 involvement doesn't have to concern itself
- * with length changes, and so can be processed faster. regexec.c takes
- * advantage of this. Generally, an EXACTFish node that is in UTF-8 is
- * pre-folded by regcomp.c (except EXACTFL, some of whose folds aren't
- * known until runtime). This saves effort in regex matching. However,
- * the pre-folding isn't done for non-UTF8 patterns because the fold of
- * the MICRO SIGN requires UTF-8, and we don't want to slow things down by
- * forcing the pattern into UTF8 unless necessary. Also what EXACTF (and,
- * again, EXACTFL) nodes fold to isn't known until runtime. The fold
- * possibilities for the non-UTF8 patterns are quite simple, except for
- * the sharp s. All the ones that don't involve a UTF-8 target string are
- * members of a fold-pair, and arrays are set up for all of them so that
- * the other member of the pair can be found quickly. Code elsewhere in
- * this file makes sure that in EXACTFU nodes, the sharp s gets folded to
- * 'ss', even if the pattern isn't UTF-8. This avoids the issues
- * described in the next item.
- * 3) A problem remains for unfolded multi-char folds. (These occur when the
- * validity of the fold won't be known until runtime, and so must remain
- * unfolded for now. This happens for the sharp s in EXACTF and EXACTFA
- * nodes when the pattern isn't in UTF-8. (Note, BTW, that there cannot
- * be an EXACTF node with a UTF-8 pattern.) They also occur for various
- * folds in EXACTFL nodes, regardless of the UTF-ness of the pattern.)
- * The reason this is a problem is that the optimizer part of regexec.c
- * (probably unwittingly, in Perl_regexec_flags()) makes an assumption
- * that a character in the pattern corresponds to at most a single
- * character in the target string. (And I do mean character, and not byte
- * here, unlike other parts of the documentation that have never been
- * updated to account for multibyte Unicode.) sharp s in EXACTF and
- * EXACTFL nodes can match the two character string 'ss'; in EXACTFA nodes
- * it can match "\x{17F}\x{17F}". These, along with other ones in EXACTFL
- * nodes, violate the assumption, and they are the only instances where it
- * is violated. I'm reluctant to try to change the assumption, as the
- * code involved is impenetrable to me (khw), so instead the code here
- * punts. This routine examines EXACTFL nodes, and (when the pattern
- * isn't UTF-8) EXACTF and EXACTFA for such unfolded folds, and returns a
- * boolean indicating whether or not the node contains such a fold. When
- * it is true, the caller sets a flag that later causes the optimizer in
- * this file to not set values for the floating and fixed string lengths,
- * and thus avoids the optimizer code in regexec.c that makes the invalid
- * assumption. Thus, there is no optimization based on string lengths for
- * EXACTFL nodes that contain these few folds, nor for non-UTF8-pattern
- * EXACTF and EXACTFA nodes that contain the sharp s. (The reason the
- * assumption is wrong only in these cases is that all other non-UTF-8
- * folds are 1-1; and, for UTF-8 patterns, we pre-fold all other folds to
- * their expanded versions. (Again, we can't prefold sharp s to 'ss' in
- * EXACTF nodes because we don't know at compile time if it actually
- * matches 'ss' or not. For EXACTF nodes it will match iff the target
- * string is in UTF-8. This is in contrast to EXACTFU nodes, where it
- * always matches; and EXACTFA where it never does. In an EXACTFA node in
- * a UTF-8 pattern, sharp s is folded to "\x{17F}\x{17F}, avoiding the
- * problem; but in a non-UTF8 pattern, folding it to that above-Latin1
- * string would require the pattern to be forced into UTF-8, the overhead
- * of which we want to avoid. Similarly the unfolded multi-char folds in
- * EXACTFL nodes will match iff the locale at the time of match is a UTF-8
- * locale.)
- *
- * Similarly, the code that generates tries doesn't currently handle
- * not-already-folded multi-char folds, and it looks like a pain to change
- * that. Therefore, trie generation of EXACTFA nodes with the sharp s
- * doesn't work. Instead, such an EXACTFA is turned into a new regnode,
- * EXACTFA_NO_TRIE, which the trie code knows not to handle. Most people
- * using /iaa matching will be doing so almost entirely with ASCII
- * strings, so this should rarely be encountered in practice */
-
-#define JOIN_EXACT(scan,min_subtract,unfolded_multi_char, flags) \
- if (PL_regkind[OP(scan)] == EXACT) \
- join_exact(pRExC_state,(scan),(min_subtract),unfolded_multi_char, (flags),NULL,depth+1)
-
-STATIC U32
-S_join_exact(pTHX_ RExC_state_t *pRExC_state, regnode *scan,
- UV *min_subtract, bool *unfolded_multi_char,
- U32 flags,regnode *val, U32 depth)
-{
- /* Merge several consecutive EXACTish nodes into one. */
- regnode *n = regnext(scan);
- U32 stringok = 1;
- regnode *next = scan + NODE_SZ_STR(scan);
- U32 merged = 0;
- U32 stopnow = 0;
-#ifdef DEBUGGING
- regnode *stop = scan;
- GET_RE_DEBUG_FLAGS_DECL;
-#else
- PERL_UNUSED_ARG(depth);
-#endif
-
- PERL_ARGS_ASSERT_JOIN_EXACT;
-#ifndef EXPERIMENTAL_INPLACESCAN
- PERL_UNUSED_ARG(flags);
- PERL_UNUSED_ARG(val);
-#endif
- DEBUG_PEEP("join",scan,depth);
-
- /* Look through the subsequent nodes in the chain. Skip NOTHING, merge
- * EXACT ones that are mergeable to the current one. */
- while (n
- && (PL_regkind[OP(n)] == NOTHING
- || (stringok && OP(n) == OP(scan)))
- && NEXT_OFF(n)
- && NEXT_OFF(scan) + NEXT_OFF(n) < I16_MAX)
- {
-
- if (OP(n) == TAIL || n > next)
- stringok = 0;
- if (PL_regkind[OP(n)] == NOTHING) {
- DEBUG_PEEP("skip:",n,depth);
- NEXT_OFF(scan) += NEXT_OFF(n);
- next = n + NODE_STEP_REGNODE;
-#ifdef DEBUGGING
- if (stringok)
- stop = n;
-#endif
- n = regnext(n);
- }
- else if (stringok) {
- const unsigned int oldl = STR_LEN(scan);
- regnode * const nnext = regnext(n);
-
- /* XXX I (khw) kind of doubt that this works on platforms (should
- * Perl ever run on one) where U8_MAX is above 255 because of lots
- * of other assumptions */
- /* Don't join if the sum can't fit into a single node */
- if (oldl + STR_LEN(n) > U8_MAX)
- break;
-
- DEBUG_PEEP("merg",n,depth);
- merged++;
-
- NEXT_OFF(scan) += NEXT_OFF(n);
- STR_LEN(scan) += STR_LEN(n);
- next = n + NODE_SZ_STR(n);
- /* Now we can overwrite *n : */
- Move(STRING(n), STRING(scan) + oldl, STR_LEN(n), char);
-#ifdef DEBUGGING
- stop = next - 1;
-#endif
- n = nnext;
- if (stopnow) break;
- }
-
-#ifdef EXPERIMENTAL_INPLACESCAN
- if (flags && !NEXT_OFF(n)) {
- DEBUG_PEEP("atch", val, depth);
- if (reg_off_by_arg[OP(n)]) {
- ARG_SET(n, val - n);
- }
- else {
- NEXT_OFF(n) = val - n;
- }
- stopnow = 1;
- }
-#endif
- }
-
- *min_subtract = 0;
- *unfolded_multi_char = FALSE;
-
- /* Here, all the adjacent mergeable EXACTish nodes have been merged. We
- * can now analyze for sequences of problematic code points. (Prior to
- * this final joining, sequences could have been split over boundaries, and
- * hence missed). The sequences only happen in folding, hence for any
- * non-EXACT EXACTish node */
- if (OP(scan) != EXACT) {
- U8* s0 = (U8*) STRING(scan);
- U8* s = s0;
- U8* s_end = s0 + STR_LEN(scan);
-
- int total_count_delta = 0; /* Total delta number of characters that
- multi-char folds expand to */
-
- /* One pass is made over the node's string looking for all the
- * possibilities. To avoid some tests in the loop, there are two main
- * cases, for UTF-8 patterns (which can't have EXACTF nodes) and
- * non-UTF-8 */
- if (UTF) {
- U8* folded = NULL;
-
- if (OP(scan) == EXACTFL) {
- U8 *d;
-
- /* An EXACTFL node would already have been changed to another
- * node type unless there is at least one character in it that
- * is problematic; likely a character whose fold definition
- * won't be known until runtime, and so has yet to be folded.
- * For all but the UTF-8 locale, folds are 1-1 in length, but
- * to handle the UTF-8 case, we need to create a temporary
- * folded copy using UTF-8 locale rules in order to analyze it.
- * This is because our macros that look to see if a sequence is
- * a multi-char fold assume everything is folded (otherwise the
- * tests in those macros would be too complicated and slow).
- * Note that here, the non-problematic folds will have already
- * been done, so we can just copy such characters. We actually
- * don't completely fold the EXACTFL string. We skip the
- * unfolded multi-char folds, as that would just create work
- * below to figure out the size they already are */
-
- Newx(folded, UTF8_MAX_FOLD_CHAR_EXPAND * STR_LEN(scan) + 1, U8);
- d = folded;
- while (s < s_end) {
- STRLEN s_len = UTF8SKIP(s);
- if (! is_PROBLEMATIC_LOCALE_FOLD_utf8(s)) {
- Copy(s, d, s_len, U8);
- d += s_len;
- }
- else if (is_FOLDS_TO_MULTI_utf8(s)) {
- *unfolded_multi_char = TRUE;
- Copy(s, d, s_len, U8);
- d += s_len;
- }
- else if (isASCII(*s)) {
- *(d++) = toFOLD(*s);
- }
- else {
- STRLEN len;
- _to_utf8_fold_flags(s, d, &len, FOLD_FLAGS_FULL);
- d += len;
- }
- s += s_len;
- }
-
- /* Point the remainder of the routine to look at our temporary
- * folded copy */
- s = folded;
- s_end = d;
- } /* End of creating folded copy of EXACTFL string */
-
- /* Examine the string for a multi-character fold sequence. UTF-8
- * patterns have all characters pre-folded by the time this code is
- * executed */
- while (s < s_end - 1) /* Can stop 1 before the end, as minimum
- length sequence we are looking for is 2 */
- {
- int count = 0; /* How many characters in a multi-char fold */
- int len = is_MULTI_CHAR_FOLD_utf8_safe(s, s_end);
- if (! len) { /* Not a multi-char fold: get next char */
- s += UTF8SKIP(s);
- continue;
- }
-
- /* Nodes with 'ss' require special handling, except for
- * EXACTFA-ish for which there is no multi-char fold to this */
- if (len == 2 && *s == 's' && *(s+1) == 's'
- && OP(scan) != EXACTFA
- && OP(scan) != EXACTFA_NO_TRIE)
- {
- count = 2;
- if (OP(scan) != EXACTFL) {
- OP(scan) = EXACTFU_SS;
- }
- s += 2;
- }
- else { /* Here is a generic multi-char fold. */
- U8* multi_end = s + len;
-
- /* Count how many characters are in it. In the case of
- * /aa, no folds which contain ASCII code points are
- * allowed, so check for those, and skip if found. */
- if (OP(scan) != EXACTFA && OP(scan) != EXACTFA_NO_TRIE) {
- count = utf8_length(s, multi_end);
- s = multi_end;
- }
- else {
- while (s < multi_end) {
- if (isASCII(*s)) {
- s++;
- goto next_iteration;
- }
- else {
- s += UTF8SKIP(s);
- }
- count++;
- }
- }
- }
-
- /* The delta is how long the sequence is minus 1 (1 is how long
- * the character that folds to the sequence is) */
- total_count_delta += count - 1;
- next_iteration: ;
- }
-
- /* We created a temporary folded copy of the string in EXACTFL
- * nodes. Therefore we need to be sure it doesn't go below zero,
- * as the real string could be shorter */
- if (OP(scan) == EXACTFL) {
- int total_chars = utf8_length((U8*) STRING(scan),
- (U8*) STRING(scan) + STR_LEN(scan));
- if (total_count_delta > total_chars) {
- total_count_delta = total_chars;
- }
- }
-
- *min_subtract += total_count_delta;
- Safefree(folded);
- }
- else if (OP(scan) == EXACTFA) {
-
- /* Non-UTF-8 pattern, EXACTFA node. There can't be a multi-char
- * fold to the ASCII range (and there are no existing ones in the
- * upper latin1 range). But, as outlined in the comments preceding
- * this function, we need to flag any occurrences of the sharp s.
- * This character forbids trie formation (because of added
- * complexity) */
- while (s < s_end) {
- if (*s == LATIN_SMALL_LETTER_SHARP_S) {
- OP(scan) = EXACTFA_NO_TRIE;
- *unfolded_multi_char = TRUE;
- break;
- }
- s++;
- continue;
- }
- }
- else {
-
- /* Non-UTF-8 pattern, not EXACTFA node. Look for the multi-char
- * folds that are all Latin1. As explained in the comments
- * preceding this function, we look also for the sharp s in EXACTF
- * and EXACTFL nodes; it can be in the final position. Otherwise
- * we can stop looking 1 byte earlier because have to find at least
- * two characters for a multi-fold */
- const U8* upper = (OP(scan) == EXACTF || OP(scan) == EXACTFL)
- ? s_end
- : s_end -1;
-
- while (s < upper) {
- int len = is_MULTI_CHAR_FOLD_latin1_safe(s, s_end);
- if (! len) { /* Not a multi-char fold. */
- if (*s == LATIN_SMALL_LETTER_SHARP_S
- && (OP(scan) == EXACTF || OP(scan) == EXACTFL))
- {
- *unfolded_multi_char = TRUE;
- }
- s++;
- continue;
- }
-
- if (len == 2
- && isARG2_lower_or_UPPER_ARG1('s', *s)
- && isARG2_lower_or_UPPER_ARG1('s', *(s+1)))
- {
-
- /* EXACTF nodes need to know that the minimum length
- * changed so that a sharp s in the string can match this
- * ss in the pattern, but they remain EXACTF nodes, as they
- * won't match this unless the target string is is UTF-8,
- * which we don't know until runtime. EXACTFL nodes can't
- * transform into EXACTFU nodes */
- if (OP(scan) != EXACTF && OP(scan) != EXACTFL) {
- OP(scan) = EXACTFU_SS;
- }
- }
-
- *min_subtract += len - 1;
- s += len;
- }
- }
- }
-
-#ifdef DEBUGGING
- /* Allow dumping but overwriting the collection of skipped
- * ops and/or strings with fake optimized ops */
- n = scan + NODE_SZ_STR(scan);
- while (n <= stop) {
- OP(n) = OPTIMIZED;
- FLAGS(n) = 0;
- NEXT_OFF(n) = 0;
- n++;
- }
-#endif
- DEBUG_OPTIMISE_r(if (merged){DEBUG_PEEP("finl",scan,depth)});
- return stopnow;
-}
-
-/* REx optimizer. Converts nodes into quicker variants "in place".
- Finds fixed substrings. */
-
-/* Stops at toplevel WHILEM as well as at "last". At end *scanp is set
- to the position after last scanned or to NULL. */
-
-#define INIT_AND_WITHP \
- assert(!and_withp); \
- Newx(and_withp,1, regnode_ssc); \
- SAVEFREEPV(and_withp)
-
-/* this is a chain of data about sub patterns we are processing that
- need to be handled separately/specially in study_chunk. Its so
- we can simulate recursion without losing state. */
-struct scan_frame;
-typedef struct scan_frame {
- regnode *last; /* last node to process in this frame */
- regnode *next; /* next node to process when last is reached */
- struct scan_frame *prev; /*previous frame*/
- U32 prev_recursed_depth;
- I32 stop; /* what stopparen do we use */
-} scan_frame;
-
-
-STATIC SSize_t
-S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp,
- SSize_t *minlenp, SSize_t *deltap,
- regnode *last,
- scan_data_t *data,
- I32 stopparen,
- U32 recursed_depth,
- regnode_ssc *and_withp,
- U32 flags, U32 depth)
- /* scanp: Start here (read-write). */
- /* deltap: Write maxlen-minlen here. */
- /* last: Stop before this one. */
- /* data: string data about the pattern */
- /* stopparen: treat close N as END */
- /* recursed: which subroutines have we recursed into */
- /* and_withp: Valid if flags & SCF_DO_STCLASS_OR */
-{
- /* There must be at least this number of characters to match */
- SSize_t min = 0;
- I32 pars = 0, code;
- regnode *scan = *scanp, *next;
- SSize_t delta = 0;
- int is_inf = (flags & SCF_DO_SUBSTR) && (data->flags & SF_IS_INF);
- int is_inf_internal = 0; /* The studied chunk is infinite */
- I32 is_par = OP(scan) == OPEN ? ARG(scan) : 0;
- scan_data_t data_fake;
- SV *re_trie_maxbuff = NULL;
- regnode *first_non_open = scan;
- SSize_t stopmin = SSize_t_MAX;
- scan_frame *frame = NULL;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_STUDY_CHUNK;
-
-#ifdef DEBUGGING
- StructCopy(&zero_scan_data, &data_fake, scan_data_t);
-#endif
- if ( depth == 0 ) {
- while (first_non_open && OP(first_non_open) == OPEN)
- first_non_open=regnext(first_non_open);
- }
-
-
- fake_study_recurse:
- while ( scan && OP(scan) != END && scan < last ){
- UV min_subtract = 0; /* How mmany chars to subtract from the minimum
- node length to get a real minimum (because
- the folded version may be shorter) */
- bool unfolded_multi_char = FALSE;
- /* Peephole optimizer: */
- DEBUG_OPTIMISE_MORE_r(
- {
- PerlIO_printf(Perl_debug_log,
- "%*sstudy_chunk stopparen=%ld depth=%lu recursed_depth=%lu ",
- ((int) depth*2), "", (long)stopparen,
- (unsigned long)depth, (unsigned long)recursed_depth);
- if (recursed_depth) {
- U32 i;
- U32 j;
- for ( j = 0 ; j < recursed_depth ; j++ ) {
- PerlIO_printf(Perl_debug_log,"[");
- for ( i = 0 ; i < (U32)RExC_npar ; i++ )
- PerlIO_printf(Perl_debug_log,"%d",
- PAREN_TEST(RExC_study_chunk_recursed +
- (j * RExC_study_chunk_recursed_bytes), i)
- ? 1 : 0
- );
- PerlIO_printf(Perl_debug_log,"]");
- }
- }
- PerlIO_printf(Perl_debug_log,"\n");
- }
- );
- DEBUG_STUDYDATA("Peep:", data, depth);
- DEBUG_PEEP("Peep", scan, depth);
-
-
- /* The reason we do this here we need to deal with things like /(?:f)(?:o)(?:o)/
- * which cant be dealt with by the normal EXACT parsing code, as each (?:..) is handled
- * by a different invocation of reg() -- Yves
- */
- JOIN_EXACT(scan,&min_subtract, &unfolded_multi_char, 0);
-
- /* Follow the next-chain of the current node and optimize
- away all the NOTHINGs from it. */
- if (OP(scan) != CURLYX) {
- const int max = (reg_off_by_arg[OP(scan)]
- ? I32_MAX
- /* I32 may be smaller than U16 on CRAYs! */
- : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
- int off = (reg_off_by_arg[OP(scan)] ? ARG(scan) : NEXT_OFF(scan));
- int noff;
- regnode *n = scan;
-
- /* Skip NOTHING and LONGJMP. */
- while ((n = regnext(n))
- && ((PL_regkind[OP(n)] == NOTHING && (noff = NEXT_OFF(n)))
- || ((OP(n) == LONGJMP) && (noff = ARG(n))))
- && off + noff < max)
- off += noff;
- if (reg_off_by_arg[OP(scan)])
- ARG(scan) = off;
- else
- NEXT_OFF(scan) = off;
- }
-
-
-
- /* The principal pseudo-switch. Cannot be a switch, since we
- look into several different things. */
- if (OP(scan) == BRANCH || OP(scan) == BRANCHJ
- || OP(scan) == IFTHEN) {
- next = regnext(scan);
- code = OP(scan);
- /* demq: the op(next)==code check is to see if we have
- * "branch-branch" AFAICT */
-
- if (OP(next) == code || code == IFTHEN) {
- /* NOTE - There is similar code to this block below for
- * handling TRIE nodes on a re-study. If you change stuff here
- * check there too. */
- SSize_t max1 = 0, min1 = SSize_t_MAX, num = 0;
- regnode_ssc accum;
- regnode * const startbranch=scan;
-
- if (flags & SCF_DO_SUBSTR) {
- /* Cannot merge strings after this. */
- scan_commit(pRExC_state, data, minlenp, is_inf);
- }
-
- if (flags & SCF_DO_STCLASS)
- ssc_init_zero(pRExC_state, &accum);
-
- while (OP(scan) == code) {
- SSize_t deltanext, minnext, fake;
- I32 f = 0;
- regnode_ssc this_class;
-
- num++;
- data_fake.flags = 0;
- if (data) {
- data_fake.whilem_c = data->whilem_c;
- data_fake.last_closep = data->last_closep;
- }
- else
- data_fake.last_closep = &fake;
-
- data_fake.pos_delta = delta;
- next = regnext(scan);
- scan = NEXTOPER(scan);
- if (code != BRANCH)
- scan = NEXTOPER(scan);
- if (flags & SCF_DO_STCLASS) {
- ssc_init(pRExC_state, &this_class);
- data_fake.start_class = &this_class;
- f = SCF_DO_STCLASS_AND;
- }
- if (flags & SCF_WHILEM_VISITED_POS)
- f |= SCF_WHILEM_VISITED_POS;
-
- /* we suppose the run is continuous, last=next...*/
- minnext = study_chunk(pRExC_state, &scan, minlenp,
- &deltanext, next, &data_fake, stopparen,
- recursed_depth, NULL, f,depth+1);
- if (min1 > minnext)
- min1 = minnext;
- if (deltanext == SSize_t_MAX) {
- is_inf = is_inf_internal = 1;
- max1 = SSize_t_MAX;
- } else if (max1 < minnext + deltanext)
- max1 = minnext + deltanext;
- scan = next;
- if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
- pars++;
- if (data_fake.flags & SCF_SEEN_ACCEPT) {
- if ( stopmin > minnext)
- stopmin = min + min1;
- flags &= ~SCF_DO_SUBSTR;
- if (data)
- data->flags |= SCF_SEEN_ACCEPT;
- }
- if (data) {
- if (data_fake.flags & SF_HAS_EVAL)
- data->flags |= SF_HAS_EVAL;
- data->whilem_c = data_fake.whilem_c;
- }
- if (flags & SCF_DO_STCLASS)
- ssc_or(pRExC_state, &accum, (regnode_charclass*)&this_class);
- }
- if (code == IFTHEN && num < 2) /* Empty ELSE branch */
- min1 = 0;
- if (flags & SCF_DO_SUBSTR) {
- data->pos_min += min1;
- if (data->pos_delta >= SSize_t_MAX - (max1 - min1))
- data->pos_delta = SSize_t_MAX;
- else
- data->pos_delta += max1 - min1;
- if (max1 != min1 || is_inf)
- data->longest = &(data->longest_float);
- }
- min += min1;
- if (delta == SSize_t_MAX
- || SSize_t_MAX - delta - (max1 - min1) < 0)
- delta = SSize_t_MAX;
- else
- delta += max1 - min1;
- if (flags & SCF_DO_STCLASS_OR) {
- ssc_or(pRExC_state, data->start_class, (regnode_charclass*) &accum);
- if (min1) {
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
- flags &= ~SCF_DO_STCLASS;
- }
- }
- else if (flags & SCF_DO_STCLASS_AND) {
- if (min1) {
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) &accum);
- flags &= ~SCF_DO_STCLASS;
- }
- else {
- /* Switch to OR mode: cache the old value of
- * data->start_class */
- INIT_AND_WITHP;
- StructCopy(data->start_class, and_withp, regnode_ssc);
- flags &= ~SCF_DO_STCLASS_AND;
- StructCopy(&accum, data->start_class, regnode_ssc);
- flags |= SCF_DO_STCLASS_OR;
- }
- }
-
- if (PERL_ENABLE_TRIE_OPTIMISATION &&
- OP( startbranch ) == BRANCH )
- {
- /* demq.
-
- Assuming this was/is a branch we are dealing with: 'scan'
- now points at the item that follows the branch sequence,
- whatever it is. We now start at the beginning of the
- sequence and look for subsequences of
-
- BRANCH->EXACT=>x1
- BRANCH->EXACT=>x2
- tail
-
- which would be constructed from a pattern like
- /A|LIST|OF|WORDS/
-
- If we can find such a subsequence we need to turn the first
- element into a trie and then add the subsequent branch exact
- strings to the trie.
-
- We have two cases
-
- 1. patterns where the whole set of branches can be
- converted.
-
- 2. patterns where only a subset can be converted.
-
- In case 1 we can replace the whole set with a single regop
- for the trie. In case 2 we need to keep the start and end
- branches so
-
- 'BRANCH EXACT; BRANCH EXACT; BRANCH X'
- becomes BRANCH TRIE; BRANCH X;
-
- There is an additional case, that being where there is a
- common prefix, which gets split out into an EXACT like node
- preceding the TRIE node.
-
- If x(1..n)==tail then we can do a simple trie, if not we make
- a "jump" trie, such that when we match the appropriate word
- we "jump" to the appropriate tail node. Essentially we turn
- a nested if into a case structure of sorts.
-
- */
-
- int made=0;
- if (!re_trie_maxbuff) {
- re_trie_maxbuff = get_sv(RE_TRIE_MAXBUF_NAME, 1);
- if (!SvIOK(re_trie_maxbuff))
- sv_setiv(re_trie_maxbuff, RE_TRIE_MAXBUF_INIT);
- }
- if ( SvIV(re_trie_maxbuff)>=0 ) {
- regnode *cur;
- regnode *first = (regnode *)NULL;
- regnode *last = (regnode *)NULL;
- regnode *tail = scan;
- U8 trietype = 0;
- U32 count=0;
-
-#ifdef DEBUGGING
- SV * const mysv = sv_newmortal(); /* for dumping */
-#endif
- /* var tail is used because there may be a TAIL
- regop in the way. Ie, the exacts will point to the
- thing following the TAIL, but the last branch will
- point at the TAIL. So we advance tail. If we
- have nested (?:) we may have to move through several
- tails.
- */
-
- while ( OP( tail ) == TAIL ) {
- /* this is the TAIL generated by (?:) */
- tail = regnext( tail );
- }
-
-
- DEBUG_TRIE_COMPILE_r({
- regprop(RExC_rx, mysv, tail, NULL);
- PerlIO_printf( Perl_debug_log, "%*s%s%s\n",
- (int)depth * 2 + 2, "",
- "Looking for TRIE'able sequences. Tail node is: ",
- SvPV_nolen_const( mysv )
- );
- });
-
- /*
-
- Step through the branches
- cur represents each branch,
- noper is the first thing to be matched as part
- of that branch
- noper_next is the regnext() of that node.
-
- We normally handle a case like this
- /FOO[xyz]|BAR[pqr]/ via a "jump trie" but we also
- support building with NOJUMPTRIE, which restricts
- the trie logic to structures like /FOO|BAR/.
-
- If noper is a trieable nodetype then the branch is
- a possible optimization target. If we are building
- under NOJUMPTRIE then we require that noper_next is
- the same as scan (our current position in the regex
- program).
-
- Once we have two or more consecutive such branches
- we can create a trie of the EXACT's contents and
- stitch it in place into the program.
-
- If the sequence represents all of the branches in
- the alternation we replace the entire thing with a
- single TRIE node.
-
- Otherwise when it is a subsequence we need to
- stitch it in place and replace only the relevant
- branches. This means the first branch has to remain
- as it is used by the alternation logic, and its
- next pointer, and needs to be repointed at the item
- on the branch chain following the last branch we
- have optimized away.
-
- This could be either a BRANCH, in which case the
- subsequence is internal, or it could be the item
- following the branch sequence in which case the
- subsequence is at the end (which does not
- necessarily mean the first node is the start of the
- alternation).
-
- TRIE_TYPE(X) is a define which maps the optype to a
- trietype.
-
- optype | trietype
- ----------------+-----------
- NOTHING | NOTHING
- EXACT | EXACT
- EXACTFU | EXACTFU
- EXACTFU_SS | EXACTFU
- EXACTFA | EXACTFA
-
-
- */
-#define TRIE_TYPE(X) ( ( NOTHING == (X) ) ? NOTHING : \
- ( EXACT == (X) ) ? EXACT : \
- ( EXACTFU == (X) || EXACTFU_SS == (X) ) ? EXACTFU : \
- ( EXACTFA == (X) ) ? EXACTFA : \
- 0 )
-
- /* dont use tail as the end marker for this traverse */
- for ( cur = startbranch ; cur != scan ; cur = regnext( cur ) ) {
- regnode * const noper = NEXTOPER( cur );
- U8 noper_type = OP( noper );
- U8 noper_trietype = TRIE_TYPE( noper_type );
-#if defined(DEBUGGING) || defined(NOJUMPTRIE)
- regnode * const noper_next = regnext( noper );
- U8 noper_next_type = (noper_next && noper_next != tail) ? OP(noper_next) : 0;
- U8 noper_next_trietype = (noper_next && noper_next != tail) ? TRIE_TYPE( noper_next_type ) :0;
-#endif
-
- DEBUG_TRIE_COMPILE_r({
- regprop(RExC_rx, mysv, cur, NULL);
- PerlIO_printf( Perl_debug_log, "%*s- %s (%d)",
- (int)depth * 2 + 2,"", SvPV_nolen_const( mysv ), REG_NODE_NUM(cur) );
-
- regprop(RExC_rx, mysv, noper, NULL);
- PerlIO_printf( Perl_debug_log, " -> %s",
- SvPV_nolen_const(mysv));
-
- if ( noper_next ) {
- regprop(RExC_rx, mysv, noper_next, NULL);
- PerlIO_printf( Perl_debug_log,"\t=> %s\t",
- SvPV_nolen_const(mysv));
- }
- PerlIO_printf( Perl_debug_log, "(First==%d,Last==%d,Cur==%d,tt==%s,nt==%s,nnt==%s)\n",
- REG_NODE_NUM(first), REG_NODE_NUM(last), REG_NODE_NUM(cur),
- PL_reg_name[trietype], PL_reg_name[noper_trietype], PL_reg_name[noper_next_trietype]
- );
- });
-
- /* Is noper a trieable nodetype that can be merged
- * with the current trie (if there is one)? */
- if ( noper_trietype
- &&
- (
- ( noper_trietype == NOTHING)
- || ( trietype == NOTHING )
- || ( trietype == noper_trietype )
- )
-#ifdef NOJUMPTRIE
- && noper_next == tail
-#endif
- && count < U16_MAX)
- {
- /* Handle mergable triable node Either we are
- * the first node in a new trieable sequence,
- * in which case we do some bookkeeping,
- * otherwise we update the end pointer. */
- if ( !first ) {
- first = cur;
- if ( noper_trietype == NOTHING ) {
-#if !defined(DEBUGGING) && !defined(NOJUMPTRIE)
- regnode * const noper_next = regnext( noper );
- U8 noper_next_type = (noper_next && noper_next!=tail) ? OP(noper_next) : 0;
- U8 noper_next_trietype = noper_next_type ? TRIE_TYPE( noper_next_type ) :0;
-#endif
-
- if ( noper_next_trietype ) {
- trietype = noper_next_trietype;
- } else if (noper_next_type) {
- /* a NOTHING regop is 1 regop wide.
- * We need at least two for a trie
- * so we can't merge this in */
- first = NULL;
- }
- } else {
- trietype = noper_trietype;
- }
- } else {
- if ( trietype == NOTHING )
- trietype = noper_trietype;
- last = cur;
- }
- if (first)
- count++;
- } /* end handle mergable triable node */
- else {
- /* handle unmergable node -
- * noper may either be a triable node which can
- * not be tried together with the current trie,
- * or a non triable node */
- if ( last ) {
- /* If last is set and trietype is not
- * NOTHING then we have found at least two
- * triable branch sequences in a row of a
- * similar trietype so we can turn them
- * into a trie. If/when we allow NOTHING to
- * start a trie sequence this condition
- * will be required, and it isn't expensive
- * so we leave it in for now. */
- if ( trietype && trietype != NOTHING )
- make_trie( pRExC_state,
- startbranch, first, cur, tail,
- count, trietype, depth+1 );
- last = NULL; /* note: we clear/update
- first, trietype etc below,
- so we dont do it here */
- }
- if ( noper_trietype
-#ifdef NOJUMPTRIE
- && noper_next == tail
-#endif
- ){
- /* noper is triable, so we can start a new
- * trie sequence */
- count = 1;
- first = cur;
- trietype = noper_trietype;
- } else if (first) {
- /* if we already saw a first but the
- * current node is not triable then we have
- * to reset the first information. */
- count = 0;
- first = NULL;
- trietype = 0;
- }
- } /* end handle unmergable node */
- } /* loop over branches */
- DEBUG_TRIE_COMPILE_r({
- regprop(RExC_rx, mysv, cur, NULL);
- PerlIO_printf( Perl_debug_log,
- "%*s- %s (%d) <SCAN FINISHED>\n",
- (int)depth * 2 + 2,
- "", SvPV_nolen_const( mysv ),REG_NODE_NUM(cur));
-
- });
- if ( last && trietype ) {
- if ( trietype != NOTHING ) {
- /* the last branch of the sequence was part of
- * a trie, so we have to construct it here
- * outside of the loop */
- made= make_trie( pRExC_state, startbranch,
- first, scan, tail, count,
- trietype, depth+1 );
-#ifdef TRIE_STUDY_OPT
- if ( ((made == MADE_EXACT_TRIE &&
- startbranch == first)
- || ( first_non_open == first )) &&
- depth==0 ) {
- flags |= SCF_TRIE_RESTUDY;
- if ( startbranch == first
- && scan == tail )
- {
- RExC_seen &=~REG_TOP_LEVEL_BRANCHES_SEEN;
- }
- }
-#endif
- } else {
- /* at this point we know whatever we have is a
- * NOTHING sequence/branch AND if 'startbranch'
- * is 'first' then we can turn the whole thing
- * into a NOTHING
- */
- if ( startbranch == first ) {
- regnode *opt;
- /* the entire thing is a NOTHING sequence,
- * something like this: (?:|) So we can
- * turn it into a plain NOTHING op. */
- DEBUG_TRIE_COMPILE_r({
- regprop(RExC_rx, mysv, cur, NULL);
- PerlIO_printf( Perl_debug_log,
- "%*s- %s (%d) <NOTHING BRANCH SEQUENCE>\n", (int)depth * 2 + 2,
- "", SvPV_nolen_const( mysv ),REG_NODE_NUM(cur));
-
- });
- OP(startbranch)= NOTHING;
- NEXT_OFF(startbranch)= tail - startbranch;
- for ( opt= startbranch + 1; opt < tail ; opt++ )
- OP(opt)= OPTIMIZED;
- }
- }
- } /* end if ( last) */
- } /* TRIE_MAXBUF is non zero */
-
- } /* do trie */
-
- }
- else if ( code == BRANCHJ ) { /* single branch is optimized. */
- scan = NEXTOPER(NEXTOPER(scan));
- } else /* single branch is optimized. */
- scan = NEXTOPER(scan);
- continue;
- } else if (OP(scan) == SUSPEND || OP(scan) == GOSUB || OP(scan) == GOSTART) {
- scan_frame *newframe = NULL;
- I32 paren;
- regnode *start;
- regnode *end;
- U32 my_recursed_depth= recursed_depth;
-
- if (OP(scan) != SUSPEND) {
- /* set the pointer */
- if (OP(scan) == GOSUB) {
- paren = ARG(scan);
- RExC_recurse[ARG2L(scan)] = scan;
- start = RExC_open_parens[paren-1];
- end = RExC_close_parens[paren-1];
- } else {
- paren = 0;
- start = RExC_rxi->program + 1;
- end = RExC_opend;
- }
- if (!recursed_depth
- ||
- !PAREN_TEST(RExC_study_chunk_recursed + ((recursed_depth-1) * RExC_study_chunk_recursed_bytes), paren)
- ) {
- if (!recursed_depth) {
- Zero(RExC_study_chunk_recursed, RExC_study_chunk_recursed_bytes, U8);
- } else {
- Copy(RExC_study_chunk_recursed + ((recursed_depth-1) * RExC_study_chunk_recursed_bytes),
- RExC_study_chunk_recursed + (recursed_depth * RExC_study_chunk_recursed_bytes),
- RExC_study_chunk_recursed_bytes, U8);
- }
- /* we havent recursed into this paren yet, so recurse into it */
- DEBUG_STUDYDATA("set:", data,depth);
- PAREN_SET(RExC_study_chunk_recursed + (recursed_depth * RExC_study_chunk_recursed_bytes), paren);
- my_recursed_depth= recursed_depth + 1;
- Newx(newframe,1,scan_frame);
- } else {
- DEBUG_STUDYDATA("inf:", data,depth);
- /* some form of infinite recursion, assume infinite length
- * */
- if (flags & SCF_DO_SUBSTR) {
- scan_commit(pRExC_state, data, minlenp, is_inf);
- data->longest = &(data->longest_float);
- }
- is_inf = is_inf_internal = 1;
- if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
- ssc_anything(data->start_class);
- flags &= ~SCF_DO_STCLASS;
- }
- } else {
- Newx(newframe,1,scan_frame);
- paren = stopparen;
- start = scan+2;
- end = regnext(scan);
- }
- if (newframe) {
- assert(start);
- assert(end);
- SAVEFREEPV(newframe);
- newframe->next = regnext(scan);
- newframe->last = last;
- newframe->stop = stopparen;
- newframe->prev = frame;
- newframe->prev_recursed_depth = recursed_depth;
-
- DEBUG_STUDYDATA("frame-new:",data,depth);
- DEBUG_PEEP("fnew", scan, depth);
-
- frame = newframe;
- scan = start;
- stopparen = paren;
- last = end;
- depth = depth + 1;
- recursed_depth= my_recursed_depth;
-
- continue;
- }
- }
- else if (OP(scan) == EXACT) {
- SSize_t l = STR_LEN(scan);
- UV uc;
- if (UTF) {
- const U8 * const s = (U8*)STRING(scan);
- uc = utf8_to_uvchr_buf(s, s + l, NULL);
- l = utf8_length(s, s + l);
- } else {
- uc = *((U8*)STRING(scan));
- }
- min += l;
- if (flags & SCF_DO_SUBSTR) { /* Update longest substr. */
- /* The code below prefers earlier match for fixed
- offset, later match for variable offset. */
- if (data->last_end == -1) { /* Update the start info. */
- data->last_start_min = data->pos_min;
- data->last_start_max = is_inf
- ? SSize_t_MAX : data->pos_min + data->pos_delta;
- }
- sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
- if (UTF)
- SvUTF8_on(data->last_found);
- {
- SV * const sv = data->last_found;
- MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
- mg_find(sv, PERL_MAGIC_utf8) : NULL;
- if (mg && mg->mg_len >= 0)
- mg->mg_len += utf8_length((U8*)STRING(scan),
- (U8*)STRING(scan)+STR_LEN(scan));
- }
- data->last_end = data->pos_min + l;
- data->pos_min += l; /* As in the first entry. */
- data->flags &= ~SF_BEFORE_EOL;
- }
-
- /* ANDing the code point leaves at most it, and not in locale, and
- * can't match null string */
- if (flags & SCF_DO_STCLASS_AND) {
- ssc_cp_and(data->start_class, uc);
- ANYOF_FLAGS(data->start_class) &= ~ANYOF_EMPTY_STRING;
- ssc_clear_locale(data->start_class);
- }
- else if (flags & SCF_DO_STCLASS_OR) {
- ssc_add_cp(data->start_class, uc);
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
-
- /* See commit msg 749e076fceedeb708a624933726e7989f2302f6a */
- ANYOF_FLAGS(data->start_class) &= ~ANYOF_EMPTY_STRING;
- }
- flags &= ~SCF_DO_STCLASS;
- }
- else if (PL_regkind[OP(scan)] == EXACT) { /* But OP != EXACT!, so is
- EXACTFish */
- SSize_t l = STR_LEN(scan);
- UV uc = *((U8*)STRING(scan));
- SV* EXACTF_invlist = _new_invlist(4); /* Start out big enough for 2
- separate code points */
- const U8 * s = (U8*)STRING(scan);
-
- /* Search for fixed substrings supports EXACT only. */
- if (flags & SCF_DO_SUBSTR) {
- assert(data);
- scan_commit(pRExC_state, data, minlenp, is_inf);
- }
- if (UTF) {
- uc = utf8_to_uvchr_buf(s, s + l, NULL);
- l = utf8_length(s, s + l);
- }
- if (unfolded_multi_char) {
- RExC_seen |= REG_UNFOLDED_MULTI_SEEN;
- }
- min += l - min_subtract;
- assert (min >= 0);
- delta += min_subtract;
- if (flags & SCF_DO_SUBSTR) {
- data->pos_min += l - min_subtract;
- if (data->pos_min < 0) {
- data->pos_min = 0;
- }
- data->pos_delta += min_subtract;
- if (min_subtract) {
- data->longest = &(data->longest_float);
- }
- }
-
- if (OP(scan) != EXACTFL && flags & SCF_DO_STCLASS_AND) {
- ssc_clear_locale(data->start_class);
- }
-
- if (! UTF) {
-
- /* We punt and assume can match anything if the node begins
- * with a multi-character fold. Things are complicated. For
- * example, /ffi/i could match any of:
- * "\N{LATIN SMALL LIGATURE FFI}"
- * "\N{LATIN SMALL LIGATURE FF}I"
- * "F\N{LATIN SMALL LIGATURE FI}"
- * plus several other things; and making sure we have all the
- * possibilities is hard. */
- if (is_MULTI_CHAR_FOLD_latin1_safe(s, s + STR_LEN(scan))) {
- EXACTF_invlist =
- _add_range_to_invlist(EXACTF_invlist, 0, UV_MAX);
- }
- else {
-
- /* Any Latin1 range character can potentially match any
- * other depending on the locale */
- if (OP(scan) == EXACTFL) {
- _invlist_union(EXACTF_invlist, PL_Latin1,
- &EXACTF_invlist);
- }
- else {
- /* But otherwise, it matches at least itself. We can
- * quickly tell if it has a distinct fold, and if so,
- * it matches that as well */
- EXACTF_invlist = add_cp_to_invlist(EXACTF_invlist, uc);
- if (IS_IN_SOME_FOLD_L1(uc)) {
- EXACTF_invlist = add_cp_to_invlist(EXACTF_invlist,
- PL_fold_latin1[uc]);
- }
- }
-
- /* Some characters match above-Latin1 ones under /i. This
- * is true of EXACTFL ones when the locale is UTF-8 */
- if (HAS_NONLATIN1_SIMPLE_FOLD_CLOSURE(uc)
- && (! isASCII(uc) || (OP(scan) != EXACTFA
- && OP(scan) != EXACTFA_NO_TRIE)))
- {
- add_above_Latin1_folds(pRExC_state,
- (U8) uc,
- &EXACTF_invlist);
- }
- }
- }
- else { /* Pattern is UTF-8 */
- U8 folded[UTF8_MAX_FOLD_CHAR_EXPAND * UTF8_MAXBYTES_CASE + 1] = { '\0' };
- STRLEN foldlen = UTF8SKIP(s);
- const U8* e = s + STR_LEN(scan);
- SV** listp;
-
- /* The only code points that aren't folded in a UTF EXACTFish
- * node are are the problematic ones in EXACTFL nodes */
- if (OP(scan) == EXACTFL
- && is_PROBLEMATIC_LOCALE_FOLDEDS_START_cp(uc))
- {
- /* We need to check for the possibility that this EXACTFL
- * node begins with a multi-char fold. Therefore we fold
- * the first few characters of it so that we can make that
- * check */
- U8 *d = folded;
- int i;
-
- for (i = 0; i < UTF8_MAX_FOLD_CHAR_EXPAND && s < e; i++) {
- if (isASCII(*s)) {
- *(d++) = (U8) toFOLD(*s);
- s++;
- }
- else {
- STRLEN len;
- to_utf8_fold(s, d, &len);
- d += len;
- s += UTF8SKIP(s);
- }
- }
-
- /* And set up so the code below that looks in this folded
- * buffer instead of the node's string */
- e = d;
- foldlen = UTF8SKIP(folded);
- s = folded;
- }
-
- /* When we reach here 's' points to the fold of the first
- * character(s) of the node; and 'e' points to far enough along
- * the folded string to be just past any possible multi-char
- * fold. 'foldlen' is the length in bytes of the first
- * character in 's'
- *
- * Unlike the non-UTF-8 case, the macro for determining if a
- * string is a multi-char fold requires all the characters to
- * already be folded. This is because of all the complications
- * if not. Note that they are folded anyway, except in EXACTFL
- * nodes. Like the non-UTF case above, we punt if the node
- * begins with a multi-char fold */
-
- if (is_MULTI_CHAR_FOLD_utf8_safe(s, e)) {
- EXACTF_invlist =
- _add_range_to_invlist(EXACTF_invlist, 0, UV_MAX);
- }
- else { /* Single char fold */
-
- /* It matches all the things that fold to it, which are
- * found in PL_utf8_foldclosures (including itself) */
- EXACTF_invlist = add_cp_to_invlist(EXACTF_invlist, uc);
- if (! PL_utf8_foldclosures) {
- _load_PL_utf8_foldclosures();
- }
- if ((listp = hv_fetch(PL_utf8_foldclosures,
- (char *) s, foldlen, FALSE)))
- {
- AV* list = (AV*) *listp;
- IV k;
- for (k = 0; k <= av_tindex(list); k++) {
- SV** c_p = av_fetch(list, k, FALSE);
- UV c;
- assert(c_p);
-
- c = SvUV(*c_p);
-
- /* /aa doesn't allow folds between ASCII and non- */
- if ((OP(scan) == EXACTFA || OP(scan) == EXACTFA_NO_TRIE)
- && isASCII(c) != isASCII(uc))
- {
- continue;
- }
-
- EXACTF_invlist = add_cp_to_invlist(EXACTF_invlist, c);
- }
- }
- }
- }
- if (flags & SCF_DO_STCLASS_AND) {
- ANYOF_FLAGS(data->start_class) &= ~ANYOF_EMPTY_STRING;
- ANYOF_POSIXL_ZERO(data->start_class);
- ssc_intersection(data->start_class, EXACTF_invlist, FALSE);
- }
- else if (flags & SCF_DO_STCLASS_OR) {
- ssc_union(data->start_class, EXACTF_invlist, FALSE);
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
-
- /* See commit msg 749e076fceedeb708a624933726e7989f2302f6a */
- ANYOF_FLAGS(data->start_class) &= ~ANYOF_EMPTY_STRING;
- }
- flags &= ~SCF_DO_STCLASS;
- SvREFCNT_dec(EXACTF_invlist);
- }
- else if (REGNODE_VARIES(OP(scan))) {
- SSize_t mincount, maxcount, minnext, deltanext, pos_before = 0;
- I32 fl = 0, f = flags;
- regnode * const oscan = scan;
- regnode_ssc this_class;
- regnode_ssc *oclass = NULL;
- I32 next_is_eval = 0;
-
- switch (PL_regkind[OP(scan)]) {
- case WHILEM: /* End of (?:...)* . */
- scan = NEXTOPER(scan);
- goto finish;
- case PLUS:
- if (flags & (SCF_DO_SUBSTR | SCF_DO_STCLASS)) {
- next = NEXTOPER(scan);
- if (OP(next) == EXACT || (flags & SCF_DO_STCLASS)) {
- mincount = 1;
- maxcount = REG_INFTY;
- next = regnext(scan);
- scan = NEXTOPER(scan);
- goto do_curly;
- }
- }
- if (flags & SCF_DO_SUBSTR)
- data->pos_min++;
- min++;
- /* FALLTHROUGH */
- case STAR:
- if (flags & SCF_DO_STCLASS) {
- mincount = 0;
- maxcount = REG_INFTY;
- next = regnext(scan);
- scan = NEXTOPER(scan);
- goto do_curly;
- }
- if (flags & SCF_DO_SUBSTR) {
- scan_commit(pRExC_state, data, minlenp, is_inf);
- /* Cannot extend fixed substrings */
- data->longest = &(data->longest_float);
- }
- is_inf = is_inf_internal = 1;
- scan = regnext(scan);
- goto optimize_curly_tail;
- case CURLY:
- if (stopparen>0 && (OP(scan)==CURLYN || OP(scan)==CURLYM)
- && (scan->flags == stopparen))
- {
- mincount = 1;
- maxcount = 1;
- } else {
- mincount = ARG1(scan);
- maxcount = ARG2(scan);
- }
- next = regnext(scan);
- if (OP(scan) == CURLYX) {
- I32 lp = (data ? *(data->last_closep) : 0);
- scan->flags = ((lp <= (I32)U8_MAX) ? (U8)lp : U8_MAX);
- }
- scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
- next_is_eval = (OP(scan) == EVAL);
- do_curly:
- if (flags & SCF_DO_SUBSTR) {
- if (mincount == 0)
- scan_commit(pRExC_state, data, minlenp, is_inf);
- /* Cannot extend fixed substrings */
- pos_before = data->pos_min;
- }
- if (data) {
- fl = data->flags;
- data->flags &= ~(SF_HAS_PAR|SF_IN_PAR|SF_HAS_EVAL);
- if (is_inf)
- data->flags |= SF_IS_INF;
- }
- if (flags & SCF_DO_STCLASS) {
- ssc_init(pRExC_state, &this_class);
- oclass = data->start_class;
- data->start_class = &this_class;
- f |= SCF_DO_STCLASS_AND;
- f &= ~SCF_DO_STCLASS_OR;
- }
- /* Exclude from super-linear cache processing any {n,m}
- regops for which the combination of input pos and regex
- pos is not enough information to determine if a match
- will be possible.
-
- For example, in the regex /foo(bar\s*){4,8}baz/ with the
- regex pos at the \s*, the prospects for a match depend not
- only on the input position but also on how many (bar\s*)
- repeats into the {4,8} we are. */
- if ((mincount > 1) || (maxcount > 1 && maxcount != REG_INFTY))
- f &= ~SCF_WHILEM_VISITED_POS;
-
- /* This will finish on WHILEM, setting scan, or on NULL: */
- minnext = study_chunk(pRExC_state, &scan, minlenp, &deltanext,
- last, data, stopparen, recursed_depth, NULL,
- (mincount == 0
- ? (f & ~SCF_DO_SUBSTR)
- : f)
- ,depth+1);
-
- if (flags & SCF_DO_STCLASS)
- data->start_class = oclass;
- if (mincount == 0 || minnext == 0) {
- if (flags & SCF_DO_STCLASS_OR) {
- ssc_or(pRExC_state, data->start_class, (regnode_charclass *) &this_class);
- }
- else if (flags & SCF_DO_STCLASS_AND) {
- /* Switch to OR mode: cache the old value of
- * data->start_class */
- INIT_AND_WITHP;
- StructCopy(data->start_class, and_withp, regnode_ssc);
- flags &= ~SCF_DO_STCLASS_AND;
- StructCopy(&this_class, data->start_class, regnode_ssc);
- flags |= SCF_DO_STCLASS_OR;
- ANYOF_FLAGS(data->start_class) |= ANYOF_EMPTY_STRING;
- }
- } else { /* Non-zero len */
- if (flags & SCF_DO_STCLASS_OR) {
- ssc_or(pRExC_state, data->start_class, (regnode_charclass *) &this_class);
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
- }
- else if (flags & SCF_DO_STCLASS_AND)
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) &this_class);
- flags &= ~SCF_DO_STCLASS;
- }
- if (!scan) /* It was not CURLYX, but CURLY. */
- scan = next;
- if (!(flags & SCF_TRIE_DOING_RESTUDY)
- /* ? quantifier ok, except for (?{ ... }) */
- && (next_is_eval || !(mincount == 0 && maxcount == 1))
- && (minnext == 0) && (deltanext == 0)
- && data && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
- && maxcount <= REG_INFTY/3) /* Complement check for big
- count */
- {
- /* Fatal warnings may leak the regexp without this: */
- SAVEFREESV(RExC_rx_sv);
- ckWARNreg(RExC_parse,
- "Quantifier unexpected on zero-length expression");
- (void)ReREFCNT_inc(RExC_rx_sv);
- }
-
- min += minnext * mincount;
- is_inf_internal |= deltanext == SSize_t_MAX
- || (maxcount == REG_INFTY && minnext + deltanext > 0);
- is_inf |= is_inf_internal;
- if (is_inf) {
- delta = SSize_t_MAX;
- } else {
- delta += (minnext + deltanext) * maxcount
- - minnext * mincount;
- }
- /* Try powerful optimization CURLYX => CURLYN. */
- if ( OP(oscan) == CURLYX && data
- && data->flags & SF_IN_PAR
- && !(data->flags & SF_HAS_EVAL)
- && !deltanext && minnext == 1 ) {
- /* Try to optimize to CURLYN. */
- regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS;
- regnode * const nxt1 = nxt;
-#ifdef DEBUGGING
- regnode *nxt2;
-#endif
-
- /* Skip open. */
- nxt = regnext(nxt);
- if (!REGNODE_SIMPLE(OP(nxt))
- && !(PL_regkind[OP(nxt)] == EXACT
- && STR_LEN(nxt) == 1))
- goto nogo;
-#ifdef DEBUGGING
- nxt2 = nxt;
-#endif
- nxt = regnext(nxt);
- if (OP(nxt) != CLOSE)
- goto nogo;
- if (RExC_open_parens) {
- RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
- RExC_close_parens[ARG(nxt1)-1]=nxt+2; /*close->while*/
- }
- /* Now we know that nxt2 is the only contents: */
- oscan->flags = (U8)ARG(nxt);
- OP(oscan) = CURLYN;
- OP(nxt1) = NOTHING; /* was OPEN. */
-
-#ifdef DEBUGGING
- OP(nxt1 + 1) = OPTIMIZED; /* was count. */
- NEXT_OFF(nxt1+ 1) = 0; /* just for consistency. */
- NEXT_OFF(nxt2) = 0; /* just for consistency with CURLY. */
- OP(nxt) = OPTIMIZED; /* was CLOSE. */
- OP(nxt + 1) = OPTIMIZED; /* was count. */
- NEXT_OFF(nxt+ 1) = 0; /* just for consistency. */
-#endif
- }
- nogo:
-
- /* Try optimization CURLYX => CURLYM. */
- if ( OP(oscan) == CURLYX && data
- && !(data->flags & SF_HAS_PAR)
- && !(data->flags & SF_HAS_EVAL)
- && !deltanext /* atom is fixed width */
- && minnext != 0 /* CURLYM can't handle zero width */
-
- /* Nor characters whose fold at run-time may be
- * multi-character */
- && ! (RExC_seen & REG_UNFOLDED_MULTI_SEEN)
- ) {
- /* XXXX How to optimize if data == 0? */
- /* Optimize to a simpler form. */
- regnode *nxt = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN */
- regnode *nxt2;
-
- OP(oscan) = CURLYM;
- while ( (nxt2 = regnext(nxt)) /* skip over embedded stuff*/
- && (OP(nxt2) != WHILEM))
- nxt = nxt2;
- OP(nxt2) = SUCCEED; /* Whas WHILEM */
- /* Need to optimize away parenths. */
- if ((data->flags & SF_IN_PAR) && OP(nxt) == CLOSE) {
- /* Set the parenth number. */
- regnode *nxt1 = NEXTOPER(oscan) + EXTRA_STEP_2ARGS; /* OPEN*/
-
- oscan->flags = (U8)ARG(nxt);
- if (RExC_open_parens) {
- RExC_open_parens[ARG(nxt1)-1]=oscan; /*open->CURLYM*/
- RExC_close_parens[ARG(nxt1)-1]=nxt2+1; /*close->NOTHING*/
- }
- OP(nxt1) = OPTIMIZED; /* was OPEN. */
- OP(nxt) = OPTIMIZED; /* was CLOSE. */
-
-#ifdef DEBUGGING
- OP(nxt1 + 1) = OPTIMIZED; /* was count. */
- OP(nxt + 1) = OPTIMIZED; /* was count. */
- NEXT_OFF(nxt1 + 1) = 0; /* just for consistency. */
- NEXT_OFF(nxt + 1) = 0; /* just for consistency. */
-#endif
-#if 0
- while ( nxt1 && (OP(nxt1) != WHILEM)) {
- regnode *nnxt = regnext(nxt1);
- if (nnxt == nxt) {
- if (reg_off_by_arg[OP(nxt1)])
- ARG_SET(nxt1, nxt2 - nxt1);
- else if (nxt2 - nxt1 < U16_MAX)
- NEXT_OFF(nxt1) = nxt2 - nxt1;
- else
- OP(nxt) = NOTHING; /* Cannot beautify */
- }
- nxt1 = nnxt;
- }
-#endif
- /* Optimize again: */
- study_chunk(pRExC_state, &nxt1, minlenp, &deltanext, nxt,
- NULL, stopparen, recursed_depth, NULL, 0,depth+1);
- }
- else
- oscan->flags = 0;
- }
- else if ((OP(oscan) == CURLYX)
- && (flags & SCF_WHILEM_VISITED_POS)
- /* See the comment on a similar expression above.
- However, this time it's not a subexpression
- we care about, but the expression itself. */
- && (maxcount == REG_INFTY)
- && data && ++data->whilem_c < 16) {
- /* This stays as CURLYX, we can put the count/of pair. */
- /* Find WHILEM (as in regexec.c) */
- regnode *nxt = oscan + NEXT_OFF(oscan);
-
- if (OP(PREVOPER(nxt)) == NOTHING) /* LONGJMP */
- nxt += ARG(nxt);
- PREVOPER(nxt)->flags = (U8)(data->whilem_c
- | (RExC_whilem_seen << 4)); /* On WHILEM */
- }
- if (data && fl & (SF_HAS_PAR|SF_IN_PAR))
- pars++;
- if (flags & SCF_DO_SUBSTR) {
- SV *last_str = NULL;
- STRLEN last_chrs = 0;
- int counted = mincount != 0;
-
- if (data->last_end > 0 && mincount != 0) { /* Ends with a
- string. */
- SSize_t b = pos_before >= data->last_start_min
- ? pos_before : data->last_start_min;
- STRLEN l;
- const char * const s = SvPV_const(data->last_found, l);
- SSize_t old = b - data->last_start_min;
-
- if (UTF)
- old = utf8_hop((U8*)s, old) - (U8*)s;
- l -= old;
- /* Get the added string: */
- last_str = newSVpvn_utf8(s + old, l, UTF);
- last_chrs = UTF ? utf8_length((U8*)(s + old),
- (U8*)(s + old + l)) : l;
- if (deltanext == 0 && pos_before == b) {
- /* What was added is a constant string */
- if (mincount > 1) {
-
- SvGROW(last_str, (mincount * l) + 1);
- repeatcpy(SvPVX(last_str) + l,
- SvPVX_const(last_str), l,
- mincount - 1);
- SvCUR_set(last_str, SvCUR(last_str) * mincount);
- /* Add additional parts. */
- SvCUR_set(data->last_found,
- SvCUR(data->last_found) - l);
- sv_catsv(data->last_found, last_str);
- {
- SV * sv = data->last_found;
- MAGIC *mg =
- SvUTF8(sv) && SvMAGICAL(sv) ?
- mg_find(sv, PERL_MAGIC_utf8) : NULL;
- if (mg && mg->mg_len >= 0)
- mg->mg_len += last_chrs * (mincount-1);
- }
- last_chrs *= mincount;
- data->last_end += l * (mincount - 1);
- }
- } else {
- /* start offset must point into the last copy */
- data->last_start_min += minnext * (mincount - 1);
- data->last_start_max += is_inf ? SSize_t_MAX
- : (maxcount - 1) * (minnext + data->pos_delta);
- }
- }
- /* It is counted once already... */
- data->pos_min += minnext * (mincount - counted);
-#if 0
-PerlIO_printf(Perl_debug_log, "counted=%"UVuf" deltanext=%"UVuf
- " SSize_t_MAX=%"UVuf" minnext=%"UVuf
- " maxcount=%"UVuf" mincount=%"UVuf"\n",
- (UV)counted, (UV)deltanext, (UV)SSize_t_MAX, (UV)minnext, (UV)maxcount,
- (UV)mincount);
-if (deltanext != SSize_t_MAX)
-PerlIO_printf(Perl_debug_log, "LHS=%"UVuf" RHS=%"UVuf"\n",
- (UV)(-counted * deltanext + (minnext + deltanext) * maxcount
- - minnext * mincount), (UV)(SSize_t_MAX - data->pos_delta));
-#endif
- if (deltanext == SSize_t_MAX
- || -counted * deltanext + (minnext + deltanext) * maxcount - minnext * mincount >= SSize_t_MAX - data->pos_delta)
- data->pos_delta = SSize_t_MAX;
- else
- data->pos_delta += - counted * deltanext +
- (minnext + deltanext) * maxcount - minnext * mincount;
- if (mincount != maxcount) {
- /* Cannot extend fixed substrings found inside
- the group. */
- scan_commit(pRExC_state, data, minlenp, is_inf);
- if (mincount && last_str) {
- SV * const sv = data->last_found;
- MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
- mg_find(sv, PERL_MAGIC_utf8) : NULL;
-
- if (mg)
- mg->mg_len = -1;
- sv_setsv(sv, last_str);
- data->last_end = data->pos_min;
- data->last_start_min = data->pos_min - last_chrs;
- data->last_start_max = is_inf
- ? SSize_t_MAX
- : data->pos_min + data->pos_delta - last_chrs;
- }
- data->longest = &(data->longest_float);
- }
- SvREFCNT_dec(last_str);
- }
- if (data && (fl & SF_HAS_EVAL))
- data->flags |= SF_HAS_EVAL;
- optimize_curly_tail:
- if (OP(oscan) != CURLYX) {
- while (PL_regkind[OP(next = regnext(oscan))] == NOTHING
- && NEXT_OFF(next))
- NEXT_OFF(oscan) += NEXT_OFF(next);
- }
- continue;
-
- default:
-#ifdef DEBUGGING
- Perl_croak(aTHX_ "panic: unexpected varying REx opcode %d",
- OP(scan));
-#endif
- case REF:
- case CLUMP:
- if (flags & SCF_DO_SUBSTR) {
- /* Cannot expect anything... */
- scan_commit(pRExC_state, data, minlenp, is_inf);
- data->longest = &(data->longest_float);
- }
- is_inf = is_inf_internal = 1;
- if (flags & SCF_DO_STCLASS_OR) {
- if (OP(scan) == CLUMP) {
- /* Actually is any start char, but very few code points
- * aren't start characters */
- ssc_match_all_cp(data->start_class);
- }
- else {
- ssc_anything(data->start_class);
- }
- }
- flags &= ~SCF_DO_STCLASS;
- break;
- }
- }
- else if (OP(scan) == LNBREAK) {
- if (flags & SCF_DO_STCLASS) {
- if (flags & SCF_DO_STCLASS_AND) {
- ssc_intersection(data->start_class,
- PL_XPosix_ptrs[_CC_VERTSPACE], FALSE);
- ssc_clear_locale(data->start_class);
- ANYOF_FLAGS(data->start_class) &= ~ANYOF_EMPTY_STRING;
- }
- else if (flags & SCF_DO_STCLASS_OR) {
- ssc_union(data->start_class,
- PL_XPosix_ptrs[_CC_VERTSPACE],
- FALSE);
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
-
- /* See commit msg for
- * 749e076fceedeb708a624933726e7989f2302f6a */
- ANYOF_FLAGS(data->start_class) &= ~ANYOF_EMPTY_STRING;
- }
- flags &= ~SCF_DO_STCLASS;
- }
- min++;
- delta++; /* Because of the 2 char string cr-lf */
- if (flags & SCF_DO_SUBSTR) {
- /* Cannot expect anything... */
- scan_commit(pRExC_state, data, minlenp, is_inf);
- data->pos_min += 1;
- data->pos_delta += 1;
- data->longest = &(data->longest_float);
- }
- }
- else if (REGNODE_SIMPLE(OP(scan))) {
-
- if (flags & SCF_DO_SUBSTR) {
- scan_commit(pRExC_state, data, minlenp, is_inf);
- data->pos_min++;
- }
- min++;
- if (flags & SCF_DO_STCLASS) {
- bool invert = 0;
- SV* my_invlist = sv_2mortal(_new_invlist(0));
- U8 namedclass;
-
- /* See commit msg 749e076fceedeb708a624933726e7989f2302f6a */
- ANYOF_FLAGS(data->start_class) &= ~ANYOF_EMPTY_STRING;
-
- /* Some of the logic below assumes that switching
- locale on will only add false positives. */
- switch (OP(scan)) {
-
- default:
-#ifdef DEBUGGING
- Perl_croak(aTHX_ "panic: unexpected simple REx opcode %d",
- OP(scan));
-#endif
- case CANY:
- case SANY:
- if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
- ssc_match_all_cp(data->start_class);
- break;
-
- case REG_ANY:
- {
- SV* REG_ANY_invlist = _new_invlist(2);
- REG_ANY_invlist = add_cp_to_invlist(REG_ANY_invlist,
- '\n');
- if (flags & SCF_DO_STCLASS_OR) {
- ssc_union(data->start_class,
- REG_ANY_invlist,
- TRUE /* TRUE => invert, hence all but \n
- */
- );
- }
- else if (flags & SCF_DO_STCLASS_AND) {
- ssc_intersection(data->start_class,
- REG_ANY_invlist,
- TRUE /* TRUE => invert */
- );
- ssc_clear_locale(data->start_class);
- }
- SvREFCNT_dec_NN(REG_ANY_invlist);
- }
- break;
-
- case ANYOF:
- if (flags & SCF_DO_STCLASS_AND)
- ssc_and(pRExC_state, data->start_class,
- (regnode_charclass *) scan);
- else
- ssc_or(pRExC_state, data->start_class,
- (regnode_charclass *) scan);
- break;
-
- case NPOSIXL:
- invert = 1;
- /* FALLTHROUGH */
-
- case POSIXL:
- namedclass = classnum_to_namedclass(FLAGS(scan)) + invert;
- if (flags & SCF_DO_STCLASS_AND) {
- bool was_there = cBOOL(
- ANYOF_POSIXL_TEST(data->start_class,
- namedclass));
- ANYOF_POSIXL_ZERO(data->start_class);
- if (was_there) { /* Do an AND */
- ANYOF_POSIXL_SET(data->start_class, namedclass);
- }
- /* No individual code points can now match */
- data->start_class->invlist
- = sv_2mortal(_new_invlist(0));
- }
- else {
- int complement = namedclass + ((invert) ? -1 : 1);
-
- assert(flags & SCF_DO_STCLASS_OR);
-
- /* If the complement of this class was already there,
- * the result is that they match all code points,
- * (\d + \D == everything). Remove the classes from
- * future consideration. Locale is not relevant in
- * this case */
- if (ANYOF_POSIXL_TEST(data->start_class, complement)) {
- ssc_match_all_cp(data->start_class);
- ANYOF_POSIXL_CLEAR(data->start_class, namedclass);
- ANYOF_POSIXL_CLEAR(data->start_class, complement);
- }
- else { /* The usual case; just add this class to the
- existing set */
- ANYOF_POSIXL_SET(data->start_class, namedclass);
- }
- }
- break;
-
- case NPOSIXA: /* For these, we always know the exact set of
- what's matched */
- invert = 1;
- /* FALLTHROUGH */
- case POSIXA:
- if (FLAGS(scan) == _CC_ASCII) {
- my_invlist = PL_XPosix_ptrs[_CC_ASCII];
- }
- else {
- _invlist_intersection(PL_XPosix_ptrs[FLAGS(scan)],
- PL_XPosix_ptrs[_CC_ASCII],
- &my_invlist);
- }
- goto join_posix;
-
- case NPOSIXD:
- case NPOSIXU:
- invert = 1;
- /* FALLTHROUGH */
- case POSIXD:
- case POSIXU:
- my_invlist = invlist_clone(PL_XPosix_ptrs[FLAGS(scan)]);
-
- /* NPOSIXD matches all upper Latin1 code points unless the
- * target string being matched is UTF-8, which is
- * unknowable until match time. Since we are going to
- * invert, we want to get rid of all of them so that the
- * inversion will match all */
- if (OP(scan) == NPOSIXD) {
- _invlist_subtract(my_invlist, PL_UpperLatin1,
- &my_invlist);
- }
-
- join_posix:
-
- if (flags & SCF_DO_STCLASS_AND) {
- ssc_intersection(data->start_class, my_invlist, invert);
- ssc_clear_locale(data->start_class);
- }
- else {
- assert(flags & SCF_DO_STCLASS_OR);
- ssc_union(data->start_class, my_invlist, invert);
- }
- }
- if (flags & SCF_DO_STCLASS_OR)
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
- flags &= ~SCF_DO_STCLASS;
- }
- }
- else if (PL_regkind[OP(scan)] == EOL && flags & SCF_DO_SUBSTR) {
- data->flags |= (OP(scan) == MEOL
- ? SF_BEFORE_MEOL
- : SF_BEFORE_SEOL);
- scan_commit(pRExC_state, data, minlenp, is_inf);
-
- }
- else if ( PL_regkind[OP(scan)] == BRANCHJ
- /* Lookbehind, or need to calculate parens/evals/stclass: */
- && (scan->flags || data || (flags & SCF_DO_STCLASS))
- && (OP(scan) == IFMATCH || OP(scan) == UNLESSM))
- {
- if ( OP(scan) == UNLESSM &&
- scan->flags == 0 &&
- OP(NEXTOPER(NEXTOPER(scan))) == NOTHING &&
- OP(regnext(NEXTOPER(NEXTOPER(scan)))) == SUCCEED
- ) {
- regnode *opt;
- regnode *upto= regnext(scan);
- DEBUG_PARSE_r({
- SV * const mysv_val=sv_newmortal();
- DEBUG_STUDYDATA("OPFAIL",data,depth);
-
- /*DEBUG_PARSE_MSG("opfail");*/
- regprop(RExC_rx, mysv_val, upto, NULL);
- PerlIO_printf(Perl_debug_log,
- "~ replace with OPFAIL pointed at %s (%"IVdf") offset %"IVdf"\n",
- SvPV_nolen_const(mysv_val),
- (IV)REG_NODE_NUM(upto),
- (IV)(upto - scan)
- );
- });
- OP(scan) = OPFAIL;
- NEXT_OFF(scan) = upto - scan;
- for (opt= scan + 1; opt < upto ; opt++)
- OP(opt) = OPTIMIZED;
- scan= upto;
- continue;
- }
- if ( !PERL_ENABLE_POSITIVE_ASSERTION_STUDY
- || OP(scan) == UNLESSM )
- {
- /* Negative Lookahead/lookbehind
- In this case we can't do fixed string optimisation.
- */
-
- SSize_t deltanext, minnext, fake = 0;
- regnode *nscan;
- regnode_ssc intrnl;
- int f = 0;
-
- data_fake.flags = 0;
- if (data) {
- data_fake.whilem_c = data->whilem_c;
- data_fake.last_closep = data->last_closep;
- }
- else
- data_fake.last_closep = &fake;
- data_fake.pos_delta = delta;
- if ( flags & SCF_DO_STCLASS && !scan->flags
- && OP(scan) == IFMATCH ) { /* Lookahead */
- ssc_init(pRExC_state, &intrnl);
- data_fake.start_class = &intrnl;
- f |= SCF_DO_STCLASS_AND;
- }
- if (flags & SCF_WHILEM_VISITED_POS)
- f |= SCF_WHILEM_VISITED_POS;
- next = regnext(scan);
- nscan = NEXTOPER(NEXTOPER(scan));
- minnext = study_chunk(pRExC_state, &nscan, minlenp, &deltanext,
- last, &data_fake, stopparen,
- recursed_depth, NULL, f, depth+1);
- if (scan->flags) {
- if (deltanext) {
- FAIL("Variable length lookbehind not implemented");
- }
- else if (minnext > (I32)U8_MAX) {
- FAIL2("Lookbehind longer than %"UVuf" not implemented",
- (UV)U8_MAX);
- }
- scan->flags = (U8)minnext;
- }
- if (data) {
- if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
- pars++;
- if (data_fake.flags & SF_HAS_EVAL)
- data->flags |= SF_HAS_EVAL;
- data->whilem_c = data_fake.whilem_c;
- }
- if (f & SCF_DO_STCLASS_AND) {
- if (flags & SCF_DO_STCLASS_OR) {
- /* OR before, AND after: ideally we would recurse with
- * data_fake to get the AND applied by study of the
- * remainder of the pattern, and then derecurse;
- * *** HACK *** for now just treat as "no information".
- * See [perl #56690].
- */
- ssc_init(pRExC_state, data->start_class);
- } else {
- /* AND before and after: combine and continue. These
- * assertions are zero-length, so can match an EMPTY
- * string */
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) &intrnl);
- ANYOF_FLAGS(data->start_class) |= ANYOF_EMPTY_STRING;
- }
- }
- }
-#if PERL_ENABLE_POSITIVE_ASSERTION_STUDY
- else {
- /* Positive Lookahead/lookbehind
- In this case we can do fixed string optimisation,
- but we must be careful about it. Note in the case of
- lookbehind the positions will be offset by the minimum
- length of the pattern, something we won't know about
- until after the recurse.
- */
- SSize_t deltanext, fake = 0;
- regnode *nscan;
- regnode_ssc intrnl;
- int f = 0;
- /* We use SAVEFREEPV so that when the full compile
- is finished perl will clean up the allocated
- minlens when it's all done. This way we don't
- have to worry about freeing them when we know
- they wont be used, which would be a pain.
- */
- SSize_t *minnextp;
- Newx( minnextp, 1, SSize_t );
- SAVEFREEPV(minnextp);
-
- if (data) {
- StructCopy(data, &data_fake, scan_data_t);
- if ((flags & SCF_DO_SUBSTR) && data->last_found) {
- f |= SCF_DO_SUBSTR;
- if (scan->flags)
- scan_commit(pRExC_state, &data_fake, minlenp, is_inf);
- data_fake.last_found=newSVsv(data->last_found);
- }
- }
- else
- data_fake.last_closep = &fake;
- data_fake.flags = 0;
- data_fake.pos_delta = delta;
- if (is_inf)
- data_fake.flags |= SF_IS_INF;
- if ( flags & SCF_DO_STCLASS && !scan->flags
- && OP(scan) == IFMATCH ) { /* Lookahead */
- ssc_init(pRExC_state, &intrnl);
- data_fake.start_class = &intrnl;
- f |= SCF_DO_STCLASS_AND;
- }
- if (flags & SCF_WHILEM_VISITED_POS)
- f |= SCF_WHILEM_VISITED_POS;
- next = regnext(scan);
- nscan = NEXTOPER(NEXTOPER(scan));
-
- *minnextp = study_chunk(pRExC_state, &nscan, minnextp,
- &deltanext, last, &data_fake,
- stopparen, recursed_depth, NULL,
- f,depth+1);
- if (scan->flags) {
- if (deltanext) {
- FAIL("Variable length lookbehind not implemented");
- }
- else if (*minnextp > (I32)U8_MAX) {
- FAIL2("Lookbehind longer than %"UVuf" not implemented",
- (UV)U8_MAX);
- }
- scan->flags = (U8)*minnextp;
- }
-
- *minnextp += min;
-
- if (f & SCF_DO_STCLASS_AND) {
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) &intrnl);
- ANYOF_FLAGS(data->start_class) |= ANYOF_EMPTY_STRING;
- }
- if (data) {
- if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
- pars++;
- if (data_fake.flags & SF_HAS_EVAL)
- data->flags |= SF_HAS_EVAL;
- data->whilem_c = data_fake.whilem_c;
- if ((flags & SCF_DO_SUBSTR) && data_fake.last_found) {
- if (RExC_rx->minlen<*minnextp)
- RExC_rx->minlen=*minnextp;
- scan_commit(pRExC_state, &data_fake, minnextp, is_inf);
- SvREFCNT_dec_NN(data_fake.last_found);
-
- if ( data_fake.minlen_fixed != minlenp )
- {
- data->offset_fixed= data_fake.offset_fixed;
- data->minlen_fixed= data_fake.minlen_fixed;
- data->lookbehind_fixed+= scan->flags;
- }
- if ( data_fake.minlen_float != minlenp )
- {
- data->minlen_float= data_fake.minlen_float;
- data->offset_float_min=data_fake.offset_float_min;
- data->offset_float_max=data_fake.offset_float_max;
- data->lookbehind_float+= scan->flags;
- }
- }
- }
- }
-#endif
- }
- else if (OP(scan) == OPEN) {
- if (stopparen != (I32)ARG(scan))
- pars++;
- }
- else if (OP(scan) == CLOSE) {
- if (stopparen == (I32)ARG(scan)) {
- break;
- }
- if ((I32)ARG(scan) == is_par) {
- next = regnext(scan);
-
- if ( next && (OP(next) != WHILEM) && next < last)
- is_par = 0; /* Disable optimization */
- }
- if (data)
- *(data->last_closep) = ARG(scan);
- }
- else if (OP(scan) == EVAL) {
- if (data)
- data->flags |= SF_HAS_EVAL;
- }
- else if ( PL_regkind[OP(scan)] == ENDLIKE ) {
- if (flags & SCF_DO_SUBSTR) {
- scan_commit(pRExC_state, data, minlenp, is_inf);
- flags &= ~SCF_DO_SUBSTR;
- }
- if (data && OP(scan)==ACCEPT) {
- data->flags |= SCF_SEEN_ACCEPT;
- if (stopmin > min)
- stopmin = min;
- }
- }
- else if (OP(scan) == LOGICAL && scan->flags == 2) /* Embedded follows */
- {
- if (flags & SCF_DO_SUBSTR) {
- scan_commit(pRExC_state, data, minlenp, is_inf);
- data->longest = &(data->longest_float);
- }
- is_inf = is_inf_internal = 1;
- if (flags & SCF_DO_STCLASS_OR) /* Allow everything */
- ssc_anything(data->start_class);
- flags &= ~SCF_DO_STCLASS;
- }
- else if (OP(scan) == GPOS) {
- if (!(RExC_rx->intflags & PREGf_GPOS_FLOAT) &&
- !(delta || is_inf || (data && data->pos_delta)))
- {
- if (!(RExC_rx->intflags & PREGf_ANCH) && (flags & SCF_DO_SUBSTR))
- RExC_rx->intflags |= PREGf_ANCH_GPOS;
- if (RExC_rx->gofs < (STRLEN)min)
- RExC_rx->gofs = min;
- } else {
- RExC_rx->intflags |= PREGf_GPOS_FLOAT;
- RExC_rx->gofs = 0;
- }
- }
-#ifdef TRIE_STUDY_OPT
-#ifdef FULL_TRIE_STUDY
- else if (PL_regkind[OP(scan)] == TRIE) {
- /* NOTE - There is similar code to this block above for handling
- BRANCH nodes on the initial study. If you change stuff here
- check there too. */
- regnode *trie_node= scan;
- regnode *tail= regnext(scan);
- reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
- SSize_t max1 = 0, min1 = SSize_t_MAX;
- regnode_ssc accum;
-
- if (flags & SCF_DO_SUBSTR) { /* XXXX Add !SUSPEND? */
- /* Cannot merge strings after this. */
- scan_commit(pRExC_state, data, minlenp, is_inf);
- }
- if (flags & SCF_DO_STCLASS)
- ssc_init_zero(pRExC_state, &accum);
-
- if (!trie->jump) {
- min1= trie->minlen;
- max1= trie->maxlen;
- } else {
- const regnode *nextbranch= NULL;
- U32 word;
-
- for ( word=1 ; word <= trie->wordcount ; word++)
- {
- SSize_t deltanext=0, minnext=0, f = 0, fake;
- regnode_ssc this_class;
-
- data_fake.flags = 0;
- if (data) {
- data_fake.whilem_c = data->whilem_c;
- data_fake.last_closep = data->last_closep;
- }
- else
- data_fake.last_closep = &fake;
- data_fake.pos_delta = delta;
- if (flags & SCF_DO_STCLASS) {
- ssc_init(pRExC_state, &this_class);
- data_fake.start_class = &this_class;
- f = SCF_DO_STCLASS_AND;
- }
- if (flags & SCF_WHILEM_VISITED_POS)
- f |= SCF_WHILEM_VISITED_POS;
-
- if (trie->jump[word]) {
- if (!nextbranch)
- nextbranch = trie_node + trie->jump[0];
- scan= trie_node + trie->jump[word];
- /* We go from the jump point to the branch that follows
- it. Note this means we need the vestigal unused
- branches even though they arent otherwise used. */
- minnext = study_chunk(pRExC_state, &scan, minlenp,
- &deltanext, (regnode *)nextbranch, &data_fake,
- stopparen, recursed_depth, NULL, f,depth+1);
- }
- if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
- nextbranch= regnext((regnode*)nextbranch);
-
- if (min1 > (SSize_t)(minnext + trie->minlen))
- min1 = minnext + trie->minlen;
- if (deltanext == SSize_t_MAX) {
- is_inf = is_inf_internal = 1;
- max1 = SSize_t_MAX;
- } else if (max1 < (SSize_t)(minnext + deltanext + trie->maxlen))
- max1 = minnext + deltanext + trie->maxlen;
-
- if (data_fake.flags & (SF_HAS_PAR|SF_IN_PAR))
- pars++;
- if (data_fake.flags & SCF_SEEN_ACCEPT) {
- if ( stopmin > min + min1)
- stopmin = min + min1;
- flags &= ~SCF_DO_SUBSTR;
- if (data)
- data->flags |= SCF_SEEN_ACCEPT;
- }
- if (data) {
- if (data_fake.flags & SF_HAS_EVAL)
- data->flags |= SF_HAS_EVAL;
- data->whilem_c = data_fake.whilem_c;
- }
- if (flags & SCF_DO_STCLASS)
- ssc_or(pRExC_state, &accum, (regnode_charclass *) &this_class);
- }
- }
- if (flags & SCF_DO_SUBSTR) {
- data->pos_min += min1;
- data->pos_delta += max1 - min1;
- if (max1 != min1 || is_inf)
- data->longest = &(data->longest_float);
- }
- min += min1;
- delta += max1 - min1;
- if (flags & SCF_DO_STCLASS_OR) {
- ssc_or(pRExC_state, data->start_class, (regnode_charclass *) &accum);
- if (min1) {
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
- flags &= ~SCF_DO_STCLASS;
- }
- }
- else if (flags & SCF_DO_STCLASS_AND) {
- if (min1) {
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) &accum);
- flags &= ~SCF_DO_STCLASS;
- }
- else {
- /* Switch to OR mode: cache the old value of
- * data->start_class */
- INIT_AND_WITHP;
- StructCopy(data->start_class, and_withp, regnode_ssc);
- flags &= ~SCF_DO_STCLASS_AND;
- StructCopy(&accum, data->start_class, regnode_ssc);
- flags |= SCF_DO_STCLASS_OR;
- }
- }
- scan= tail;
- continue;
- }
-#else
- else if (PL_regkind[OP(scan)] == TRIE) {
- reg_trie_data *trie = (reg_trie_data*)RExC_rxi->data->data[ ARG(scan) ];
- U8*bang=NULL;
-
- min += trie->minlen;
- delta += (trie->maxlen - trie->minlen);
- flags &= ~SCF_DO_STCLASS; /* xxx */
- if (flags & SCF_DO_SUBSTR) {
- /* Cannot expect anything... */
- scan_commit(pRExC_state, data, minlenp, is_inf);
- data->pos_min += trie->minlen;
- data->pos_delta += (trie->maxlen - trie->minlen);
- if (trie->maxlen != trie->minlen)
- data->longest = &(data->longest_float);
- }
- if (trie->jump) /* no more substrings -- for now /grr*/
- flags &= ~SCF_DO_SUBSTR;
- }
-#endif /* old or new */
-#endif /* TRIE_STUDY_OPT */
-
- /* Else: zero-length, ignore. */
- scan = regnext(scan);
- }
- /* If we are exiting a recursion we can unset its recursed bit
- * and allow ourselves to enter it again - no danger of an
- * infinite loop there.
- if (stopparen > -1 && recursed) {
- DEBUG_STUDYDATA("unset:", data,depth);
- PAREN_UNSET( recursed, stopparen);
- }
- */
- if (frame) {
- DEBUG_STUDYDATA("frame-end:",data,depth);
- DEBUG_PEEP("fend", scan, depth);
- /* restore previous context */
- last = frame->last;
- scan = frame->next;
- stopparen = frame->stop;
- recursed_depth = frame->prev_recursed_depth;
- depth = depth - 1;
-
- frame = frame->prev;
- goto fake_study_recurse;
- }
-
- finish:
- assert(!frame);
- DEBUG_STUDYDATA("pre-fin:",data,depth);
-
- *scanp = scan;
- *deltap = is_inf_internal ? SSize_t_MAX : delta;
-
- if (flags & SCF_DO_SUBSTR && is_inf)
- data->pos_delta = SSize_t_MAX - data->pos_min;
- if (is_par > (I32)U8_MAX)
- is_par = 0;
- if (is_par && pars==1 && data) {
- data->flags |= SF_IN_PAR;
- data->flags &= ~SF_HAS_PAR;
- }
- else if (pars && data) {
- data->flags |= SF_HAS_PAR;
- data->flags &= ~SF_IN_PAR;
- }
- if (flags & SCF_DO_STCLASS_OR)
- ssc_and(pRExC_state, data->start_class, (regnode_charclass *) and_withp);
- if (flags & SCF_TRIE_RESTUDY)
- data->flags |= SCF_TRIE_RESTUDY;
-
- DEBUG_STUDYDATA("post-fin:",data,depth);
-
- {
- SSize_t final_minlen= min < stopmin ? min : stopmin;
-
- if (!(RExC_seen & REG_UNBOUNDED_QUANTIFIER_SEEN) && (RExC_maxlen < final_minlen + delta)) {
- RExC_maxlen = final_minlen + delta;
- }
- return final_minlen;
- }
- /* not-reached */
-}
-
-STATIC U32
-S_add_data(RExC_state_t* const pRExC_state, const char* const s, const U32 n)
-{
- U32 count = RExC_rxi->data ? RExC_rxi->data->count : 0;
-
- PERL_ARGS_ASSERT_ADD_DATA;
-
- Renewc(RExC_rxi->data,
- sizeof(*RExC_rxi->data) + sizeof(void*) * (count + n - 1),
- char, struct reg_data);
- if(count)
- Renew(RExC_rxi->data->what, count + n, U8);
- else
- Newx(RExC_rxi->data->what, n, U8);
- RExC_rxi->data->count = count + n;
- Copy(s, RExC_rxi->data->what + count, n, U8);
- return count;
-}
-
-/*XXX: todo make this not included in a non debugging perl, but appears to be
- * used anyway there, in 'use re' */
-#ifndef PERL_IN_XSUB_RE
-void
-Perl_reginitcolors(pTHX)
-{
- const char * const s = PerlEnv_getenv("PERL_RE_COLORS");
- if (s) {
- char *t = savepv(s);
- int i = 0;
- PL_colors[0] = t;
- while (++i < 6) {
- t = strchr(t, '\t');
- if (t) {
- *t = '\0';
- PL_colors[i] = ++t;
- }
- else
- PL_colors[i] = t = (char *)"";
- }
- } else {
- int i = 0;
- while (i < 6)
- PL_colors[i++] = (char *)"";
- }
- PL_colorset = 1;
-}
-#endif
-
-
-#ifdef TRIE_STUDY_OPT
-#define CHECK_RESTUDY_GOTO_butfirst(dOsomething) \
- STMT_START { \
- if ( \
- (data.flags & SCF_TRIE_RESTUDY) \
- && ! restudied++ \
- ) { \
- dOsomething; \
- goto reStudy; \
- } \
- } STMT_END
-#else
-#define CHECK_RESTUDY_GOTO_butfirst
-#endif
-
-/*
- * pregcomp - compile a regular expression into internal code
- *
- * Decides which engine's compiler to call based on the hint currently in
- * scope
- */
-
-#ifndef PERL_IN_XSUB_RE
-
-/* return the currently in-scope regex engine (or the default if none) */
-
-regexp_engine const *
-Perl_current_re_engine(pTHX)
-{
- if (IN_PERL_COMPILETIME) {
- HV * const table = GvHV(PL_hintgv);
- SV **ptr;
-
- if (!table || !(PL_hints & HINT_LOCALIZE_HH))
- return &reh_regexp_engine;
- ptr = hv_fetchs(table, "regcomp", FALSE);
- if ( !(ptr && SvIOK(*ptr) && SvIV(*ptr)))
- return &reh_regexp_engine;
- return INT2PTR(regexp_engine*,SvIV(*ptr));
- }
- else {
- SV *ptr;
- if (!PL_curcop->cop_hints_hash)
- return &reh_regexp_engine;
- ptr = cop_hints_fetch_pvs(PL_curcop, "regcomp", 0);
- if ( !(ptr && SvIOK(ptr) && SvIV(ptr)))
- return &reh_regexp_engine;
- return INT2PTR(regexp_engine*,SvIV(ptr));
- }
-}
-
-
-REGEXP *
-Perl_pregcomp(pTHX_ SV * const pattern, const U32 flags)
-{
- regexp_engine const *eng = current_re_engine();
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_PREGCOMP;
-
- /* Dispatch a request to compile a regexp to correct regexp engine. */
- DEBUG_COMPILE_r({
- PerlIO_printf(Perl_debug_log, "Using engine %"UVxf"\n",
- PTR2UV(eng));
- });
- return CALLREGCOMP_ENG(eng, pattern, flags);
-}
-#endif
-
-/* public(ish) entry point for the perl core's own regex compiling code.
- * It's actually a wrapper for Perl_re_op_compile that only takes an SV
- * pattern rather than a list of OPs, and uses the internal engine rather
- * than the current one */
-
-REGEXP *
-Perl_re_compile(pTHX_ SV * const pattern, U32 rx_flags)
-{
- SV *pat = pattern; /* defeat constness! */
- PERL_ARGS_ASSERT_RE_COMPILE;
- return Perl_re_op_compile(aTHX_ &pat, 1, NULL,
-#ifdef PERL_IN_XSUB_RE
- &my_reg_engine,
-#else
- &reh_regexp_engine,
-#endif
- NULL, NULL, rx_flags, 0);
-}
-
-
-/* upgrade pattern pat_p of length plen_p to UTF8, and if there are code
- * blocks, recalculate the indices. Update pat_p and plen_p in-place to
- * point to the realloced string and length.
- *
- * This is essentially a copy of Perl_bytes_to_utf8() with the code index
- * stuff added */
-
-static void
-S_pat_upgrade_to_utf8(pTHX_ RExC_state_t * const pRExC_state,
- char **pat_p, STRLEN *plen_p, int num_code_blocks)
-{
- U8 *const src = (U8*)*pat_p;
- U8 *dst;
- int n=0;
- STRLEN s = 0, d = 0;
- bool do_end = 0;
- GET_RE_DEBUG_FLAGS_DECL;
-
- DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log,
- "UTF8 mismatch! Converting to utf8 for resizing and compile\n"));
-
- Newx(dst, *plen_p * 2 + 1, U8);
-
- while (s < *plen_p) {
- if (NATIVE_BYTE_IS_INVARIANT(src[s]))
- dst[d] = src[s];
- else {
- dst[d++] = UTF8_EIGHT_BIT_HI(src[s]);
- dst[d] = UTF8_EIGHT_BIT_LO(src[s]);
- }
- if (n < num_code_blocks) {
- if (!do_end && pRExC_state->code_blocks[n].start == s) {
- pRExC_state->code_blocks[n].start = d;
- assert(dst[d] == '(');
- do_end = 1;
- }
- else if (do_end && pRExC_state->code_blocks[n].end == s) {
- pRExC_state->code_blocks[n].end = d;
- assert(dst[d] == ')');
- do_end = 0;
- n++;
- }
- }
- s++;
- d++;
- }
- dst[d] = '\0';
- *plen_p = d;
- *pat_p = (char*) dst;
- SAVEFREEPV(*pat_p);
- RExC_orig_utf8 = RExC_utf8 = 1;
-}
-
-
-
-/* S_concat_pat(): concatenate a list of args to the pattern string pat,
- * while recording any code block indices, and handling overloading,
- * nested qr// objects etc. If pat is null, it will allocate a new
- * string, or just return the first arg, if there's only one.
- *
- * Returns the malloced/updated pat.
- * patternp and pat_count is the array of SVs to be concatted;
- * oplist is the optional list of ops that generated the SVs;
- * recompile_p is a pointer to a boolean that will be set if
- * the regex will need to be recompiled.
- * delim, if non-null is an SV that will be inserted between each element
- */
-
-static SV*
-S_concat_pat(pTHX_ RExC_state_t * const pRExC_state,
- SV *pat, SV ** const patternp, int pat_count,
- OP *oplist, bool *recompile_p, SV *delim)
-{
- SV **svp;
- int n = 0;
- bool use_delim = FALSE;
- bool alloced = FALSE;
-
- /* if we know we have at least two args, create an empty string,
- * then concatenate args to that. For no args, return an empty string */
- if (!pat && pat_count != 1) {
- pat = newSVpvs("");
- SAVEFREESV(pat);
- alloced = TRUE;
- }
-
- for (svp = patternp; svp < patternp + pat_count; svp++) {
- SV *sv;
- SV *rx = NULL;
- STRLEN orig_patlen = 0;
- bool code = 0;
- SV *msv = use_delim ? delim : *svp;
- if (!msv) msv = &PL_sv_undef;
-
- /* if we've got a delimiter, we go round the loop twice for each
- * svp slot (except the last), using the delimiter the second
- * time round */
- if (use_delim) {
- svp--;
- use_delim = FALSE;
- }
- else if (delim)
- use_delim = TRUE;
-
- if (SvTYPE(msv) == SVt_PVAV) {
- /* we've encountered an interpolated array within
- * the pattern, e.g. /...@a..../. Expand the list of elements,
- * then recursively append elements.
- * The code in this block is based on S_pushav() */
-
- AV *const av = (AV*)msv;
- const SSize_t maxarg = AvFILL(av) + 1;
- SV **array;
-
- if (oplist) {
- assert(oplist->op_type == OP_PADAV
- || oplist->op_type == OP_RV2AV);
- oplist = OP_SIBLING(oplist);
- }
-
- if (SvRMAGICAL(av)) {
- SSize_t i;
-
- Newx(array, maxarg, SV*);
- SAVEFREEPV(array);
- for (i=0; i < maxarg; i++) {
- SV ** const svp = av_fetch(av, i, FALSE);
- array[i] = svp ? *svp : &PL_sv_undef;
- }
- }
- else
- array = AvARRAY(av);
-
- pat = S_concat_pat(aTHX_ pRExC_state, pat,
- array, maxarg, NULL, recompile_p,
- /* $" */
- GvSV((gv_fetchpvs("\"", GV_ADDMULTI, SVt_PV))));
-
- continue;
- }
-
-
- /* we make the assumption here that each op in the list of
- * op_siblings maps to one SV pushed onto the stack,
- * except for code blocks, with have both an OP_NULL and
- * and OP_CONST.
- * This allows us to match up the list of SVs against the
- * list of OPs to find the next code block.
- *
- * Note that PUSHMARK PADSV PADSV ..
- * is optimised to
- * PADRANGE PADSV PADSV ..
- * so the alignment still works. */
-
- if (oplist) {
- if (oplist->op_type == OP_NULL
- && (oplist->op_flags & OPf_SPECIAL))
- {
- assert(n < pRExC_state->num_code_blocks);
- pRExC_state->code_blocks[n].start = pat ? SvCUR(pat) : 0;
- pRExC_state->code_blocks[n].block = oplist;
- pRExC_state->code_blocks[n].src_regex = NULL;
- n++;
- code = 1;
- oplist = OP_SIBLING(oplist); /* skip CONST */
- assert(oplist);
- }
- oplist = OP_SIBLING(oplist);;
- }
-
- /* apply magic and QR overloading to arg */
-
- SvGETMAGIC(msv);
- if (SvROK(msv) && SvAMAGIC(msv)) {
- SV *sv = AMG_CALLunary(msv, regexp_amg);
- if (sv) {
- if (SvROK(sv))
- sv = SvRV(sv);
- if (SvTYPE(sv) != SVt_REGEXP)
- Perl_croak(aTHX_ "Overloaded qr did not return a REGEXP");
- msv = sv;
- }
- }
-
- /* try concatenation overload ... */
- if (pat && (SvAMAGIC(pat) || SvAMAGIC(msv)) &&
- (sv = amagic_call(pat, msv, concat_amg, AMGf_assign)))
- {
- sv_setsv(pat, sv);
- /* overloading involved: all bets are off over literal
- * code. Pretend we haven't seen it */
- pRExC_state->num_code_blocks -= n;
- n = 0;
- }
- else {
- /* ... or failing that, try "" overload */
- while (SvAMAGIC(msv)
- && (sv = AMG_CALLunary(msv, string_amg))
- && sv != msv
- && !( SvROK(msv)
- && SvROK(sv)
- && SvRV(msv) == SvRV(sv))
- ) {
- msv = sv;
- SvGETMAGIC(msv);
- }
- if (SvROK(msv) && SvTYPE(SvRV(msv)) == SVt_REGEXP)
- msv = SvRV(msv);
-
- if (pat) {
- /* this is a partially unrolled
- * sv_catsv_nomg(pat, msv);
- * that allows us to adjust code block indices if
- * needed */
- STRLEN dlen;
- char *dst = SvPV_force_nomg(pat, dlen);
- orig_patlen = dlen;
- if (SvUTF8(msv) && !SvUTF8(pat)) {
- S_pat_upgrade_to_utf8(aTHX_ pRExC_state, &dst, &dlen, n);
- sv_setpvn(pat, dst, dlen);
- SvUTF8_on(pat);
- }
- sv_catsv_nomg(pat, msv);
- rx = msv;
- }
- else
- pat = msv;
-
- if (code)
- pRExC_state->code_blocks[n-1].end = SvCUR(pat)-1;
- }
-
- /* extract any code blocks within any embedded qr//'s */
- if (rx && SvTYPE(rx) == SVt_REGEXP
- && RX_ENGINE((REGEXP*)rx)->op_comp)
- {
-
- RXi_GET_DECL(ReANY((REGEXP *)rx), ri);
- if (ri->num_code_blocks) {
- int i;
- /* the presence of an embedded qr// with code means
- * we should always recompile: the text of the
- * qr// may not have changed, but it may be a
- * different closure than last time */
- *recompile_p = 1;
- Renew(pRExC_state->code_blocks,
- pRExC_state->num_code_blocks + ri->num_code_blocks,
- struct reg_code_block);
- pRExC_state->num_code_blocks += ri->num_code_blocks;
-
- for (i=0; i < ri->num_code_blocks; i++) {
- struct reg_code_block *src, *dst;
- STRLEN offset = orig_patlen
- + ReANY((REGEXP *)rx)->pre_prefix;
- assert(n < pRExC_state->num_code_blocks);
- src = &ri->code_blocks[i];
- dst = &pRExC_state->code_blocks[n];
- dst->start = src->start + offset;
- dst->end = src->end + offset;
- dst->block = src->block;
- dst->src_regex = (REGEXP*) SvREFCNT_inc( (SV*)
- src->src_regex
- ? src->src_regex
- : (REGEXP*)rx);
- n++;
- }
- }
- }
- }
- /* avoid calling magic multiple times on a single element e.g. =~ $qr */
- if (alloced)
- SvSETMAGIC(pat);
-
- return pat;
-}
-
-
-
-/* see if there are any run-time code blocks in the pattern.
- * False positives are allowed */
-
-static bool
-S_has_runtime_code(pTHX_ RExC_state_t * const pRExC_state,
- char *pat, STRLEN plen)
-{
- int n = 0;
- STRLEN s;
-
- PERL_UNUSED_CONTEXT;
-
- for (s = 0; s < plen; s++) {
- if (n < pRExC_state->num_code_blocks
- && s == pRExC_state->code_blocks[n].start)
- {
- s = pRExC_state->code_blocks[n].end;
- n++;
- continue;
- }
- /* TODO ideally should handle [..], (#..), /#.../x to reduce false
- * positives here */
- if (pat[s] == '(' && s+2 <= plen && pat[s+1] == '?' &&
- (pat[s+2] == '{'
- || (s + 2 <= plen && pat[s+2] == '?' && pat[s+3] == '{'))
- )
- return 1;
- }
- return 0;
-}
-
-/* Handle run-time code blocks. We will already have compiled any direct
- * or indirect literal code blocks. Now, take the pattern 'pat' and make a
- * copy of it, but with any literal code blocks blanked out and
- * appropriate chars escaped; then feed it into
- *
- * eval "qr'modified_pattern'"
- *
- * For example,
- *
- * a\bc(?{"this was literal"})def'ghi\\jkl(?{"this is runtime"})mno
- *
- * becomes
- *
- * qr'a\\bc_______________________def\'ghi\\\\jkl(?{"this is runtime"})mno'
- *
- * After eval_sv()-ing that, grab any new code blocks from the returned qr
- * and merge them with any code blocks of the original regexp.
- *
- * If the pat is non-UTF8, while the evalled qr is UTF8, don't merge;
- * instead, just save the qr and return FALSE; this tells our caller that
- * the original pattern needs upgrading to utf8.
- */
-
-static bool
-S_compile_runtime_code(pTHX_ RExC_state_t * const pRExC_state,
- char *pat, STRLEN plen)
-{
- SV *qr;
-
- GET_RE_DEBUG_FLAGS_DECL;
-
- if (pRExC_state->runtime_code_qr) {
- /* this is the second time we've been called; this should
- * only happen if the main pattern got upgraded to utf8
- * during compilation; re-use the qr we compiled first time
- * round (which should be utf8 too)
- */
- qr = pRExC_state->runtime_code_qr;
- pRExC_state->runtime_code_qr = NULL;
- assert(RExC_utf8 && SvUTF8(qr));
- }
- else {
- int n = 0;
- STRLEN s;
- char *p, *newpat;
- int newlen = plen + 6; /* allow for "qr''x\0" extra chars */
- SV *sv, *qr_ref;
- dSP;
-
- /* determine how many extra chars we need for ' and \ escaping */
- for (s = 0; s < plen; s++) {
- if (pat[s] == '\'' || pat[s] == '\\')
- newlen++;
- }
-
- Newx(newpat, newlen, char);
- p = newpat;
- *p++ = 'q'; *p++ = 'r'; *p++ = '\'';
-
- for (s = 0; s < plen; s++) {
- if (n < pRExC_state->num_code_blocks
- && s == pRExC_state->code_blocks[n].start)
- {
- /* blank out literal code block */
- assert(pat[s] == '(');
- while (s <= pRExC_state->code_blocks[n].end) {
- *p++ = '_';
- s++;
- }
- s--;
- n++;
- continue;
- }
- if (pat[s] == '\'' || pat[s] == '\\')
- *p++ = '\\';
- *p++ = pat[s];
- }
- *p++ = '\'';
- if (pRExC_state->pm_flags & RXf_PMf_EXTENDED)
- *p++ = 'x';
- *p++ = '\0';
- DEBUG_COMPILE_r({
- PerlIO_printf(Perl_debug_log,
- "%sre-parsing pattern for runtime code:%s %s\n",
- PL_colors[4],PL_colors[5],newpat);
- });
-
- sv = newSVpvn_flags(newpat, p-newpat-1, RExC_utf8 ? SVf_UTF8 : 0);
- Safefree(newpat);
-
- ENTER;
- SAVETMPS;
- save_re_context();
- PUSHSTACKi(PERLSI_REQUIRE);
- /* G_RE_REPARSING causes the toker to collapse \\ into \ when
- * parsing qr''; normally only q'' does this. It also alters
- * hints handling */
- eval_sv(sv, G_SCALAR|G_RE_REPARSING);
- SvREFCNT_dec_NN(sv);
- SPAGAIN;
- qr_ref = POPs;
- PUTBACK;
- {
- SV * const errsv = ERRSV;
- if (SvTRUE_NN(errsv))
- {
- Safefree(pRExC_state->code_blocks);
- /* use croak_sv ? */
- Perl_croak_nocontext("%"SVf, SVfARG(errsv));
- }
- }
- assert(SvROK(qr_ref));
- qr = SvRV(qr_ref);
- assert(SvTYPE(qr) == SVt_REGEXP && RX_ENGINE((REGEXP*)qr)->op_comp);
- /* the leaving below frees the tmp qr_ref.
- * Give qr a life of its own */
- SvREFCNT_inc(qr);
- POPSTACK;
- FREETMPS;
- LEAVE;
-
- }
-
- if (!RExC_utf8 && SvUTF8(qr)) {
- /* first time through; the pattern got upgraded; save the
- * qr for the next time through */
- assert(!pRExC_state->runtime_code_qr);
- pRExC_state->runtime_code_qr = qr;
- return 0;
- }
-
-
- /* extract any code blocks within the returned qr// */
-
-
- /* merge the main (r1) and run-time (r2) code blocks into one */
- {
- RXi_GET_DECL(ReANY((REGEXP *)qr), r2);
- struct reg_code_block *new_block, *dst;
- RExC_state_t * const r1 = pRExC_state; /* convenient alias */
- int i1 = 0, i2 = 0;
-
- if (!r2->num_code_blocks) /* we guessed wrong */
- {
- SvREFCNT_dec_NN(qr);
- return 1;
- }
-
- Newx(new_block,
- r1->num_code_blocks + r2->num_code_blocks,
- struct reg_code_block);
- dst = new_block;
-
- while ( i1 < r1->num_code_blocks
- || i2 < r2->num_code_blocks)
- {
- struct reg_code_block *src;
- bool is_qr = 0;
-
- if (i1 == r1->num_code_blocks) {
- src = &r2->code_blocks[i2++];
- is_qr = 1;
- }
- else if (i2 == r2->num_code_blocks)
- src = &r1->code_blocks[i1++];
- else if ( r1->code_blocks[i1].start
- < r2->code_blocks[i2].start)
- {
- src = &r1->code_blocks[i1++];
- assert(src->end < r2->code_blocks[i2].start);
- }
- else {
- assert( r1->code_blocks[i1].start
- > r2->code_blocks[i2].start);
- src = &r2->code_blocks[i2++];
- is_qr = 1;
- assert(src->end < r1->code_blocks[i1].start);
- }
-
- assert(pat[src->start] == '(');
- assert(pat[src->end] == ')');
- dst->start = src->start;
- dst->end = src->end;
- dst->block = src->block;
- dst->src_regex = is_qr ? (REGEXP*) SvREFCNT_inc( (SV*) qr)
- : src->src_regex;
- dst++;
- }
- r1->num_code_blocks += r2->num_code_blocks;
- Safefree(r1->code_blocks);
- r1->code_blocks = new_block;
- }
-
- SvREFCNT_dec_NN(qr);
- return 1;
-}
-
-
-STATIC bool
-S_setup_longest(pTHX_ RExC_state_t *pRExC_state, SV* sv_longest,
- SV** rx_utf8, SV** rx_substr, SSize_t* rx_end_shift,
- SSize_t lookbehind, SSize_t offset, SSize_t *minlen,
- STRLEN longest_length, bool eol, bool meol)
-{
- /* This is the common code for setting up the floating and fixed length
- * string data extracted from Perl_re_op_compile() below. Returns a boolean
- * as to whether succeeded or not */
-
- I32 t;
- SSize_t ml;
-
- if (! (longest_length
- || (eol /* Can't have SEOL and MULTI */
- && (! meol || (RExC_flags & RXf_PMf_MULTILINE)))
- )
- /* See comments for join_exact for why REG_UNFOLDED_MULTI_SEEN */
- || (RExC_seen & REG_UNFOLDED_MULTI_SEEN))
- {
- return FALSE;
- }
-
- /* copy the information about the longest from the reg_scan_data
- over to the program. */
- if (SvUTF8(sv_longest)) {
- *rx_utf8 = sv_longest;
- *rx_substr = NULL;
- } else {
- *rx_substr = sv_longest;
- *rx_utf8 = NULL;
- }
- /* end_shift is how many chars that must be matched that
- follow this item. We calculate it ahead of time as once the
- lookbehind offset is added in we lose the ability to correctly
- calculate it.*/
- ml = minlen ? *(minlen) : (SSize_t)longest_length;
- *rx_end_shift = ml - offset
- - longest_length + (SvTAIL(sv_longest) != 0)
- + lookbehind;
-
- t = (eol/* Can't have SEOL and MULTI */
- && (! meol || (RExC_flags & RXf_PMf_MULTILINE)));
- fbm_compile(sv_longest, t ? FBMcf_TAIL : 0);
-
- return TRUE;
-}
-
-/*
- * Perl_re_op_compile - the perl internal RE engine's function to compile a
- * regular expression into internal code.
- * The pattern may be passed either as:
- * a list of SVs (patternp plus pat_count)
- * a list of OPs (expr)
- * If both are passed, the SV list is used, but the OP list indicates
- * which SVs are actually pre-compiled code blocks
- *
- * The SVs in the list have magic and qr overloading applied to them (and
- * the list may be modified in-place with replacement SVs in the latter
- * case).
- *
- * If the pattern hasn't changed from old_re, then old_re will be
- * returned.
- *
- * eng is the current engine. If that engine has an op_comp method, then
- * handle directly (i.e. we assume that op_comp was us); otherwise, just
- * do the initial concatenation of arguments and pass on to the external
- * engine.
- *
- * If is_bare_re is not null, set it to a boolean indicating whether the
- * arg list reduced (after overloading) to a single bare regex which has
- * been returned (i.e. /$qr/).
- *
- * orig_rx_flags contains RXf_* flags. See perlreapi.pod for more details.
- *
- * pm_flags contains the PMf_* flags, typically based on those from the
- * pm_flags field of the related PMOP. Currently we're only interested in
- * PMf_HAS_CV, PMf_IS_QR, PMf_USE_RE_EVAL.
- *
- * We can't allocate space until we know how big the compiled form will be,
- * but we can't compile it (and thus know how big it is) until we've got a
- * place to put the code. So we cheat: we compile it twice, once with code
- * generation turned off and size counting turned on, and once "for real".
- * This also means that we don't allocate space until we are sure that the
- * thing really will compile successfully, and we never have to move the
- * code and thus invalidate pointers into it. (Note that it has to be in
- * one piece because free() must be able to free it all.) [NB: not true in perl]
- *
- * Beware that the optimization-preparation code in here knows about some
- * of the structure of the compiled regexp. [I'll say.]
- */
-
-REGEXP *
-Perl_re_op_compile(pTHX_ SV ** const patternp, int pat_count,
- OP *expr, const regexp_engine* eng, REGEXP *old_re,
- bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags)
-{
- REGEXP *rx;
- struct regexp *r;
- regexp_internal *ri;
- STRLEN plen;
- char *exp;
- regnode *scan;
- I32 flags;
- SSize_t minlen = 0;
- U32 rx_flags;
- SV *pat;
- SV *code_blocksv = NULL;
- SV** new_patternp = patternp;
-
- /* these are all flags - maybe they should be turned
- * into a single int with different bit masks */
- I32 sawlookahead = 0;
- I32 sawplus = 0;
- I32 sawopen = 0;
- I32 sawminmod = 0;
-
- regex_charset initial_charset = get_regex_charset(orig_rx_flags);
- bool recompile = 0;
- bool runtime_code = 0;
- scan_data_t data;
- RExC_state_t RExC_state;
- RExC_state_t * const pRExC_state = &RExC_state;
-#ifdef TRIE_STUDY_OPT
- int restudied = 0;
- RExC_state_t copyRExC_state;
-#endif
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_RE_OP_COMPILE;
-
- DEBUG_r(if (!PL_colorset) reginitcolors());
-
-#ifndef PERL_IN_XSUB_RE
- /* Initialize these here instead of as-needed, as is quick and avoids
- * having to test them each time otherwise */
- if (! PL_AboveLatin1) {
- PL_AboveLatin1 = _new_invlist_C_array(AboveLatin1_invlist);
- PL_Latin1 = _new_invlist_C_array(Latin1_invlist);
- PL_UpperLatin1 = _new_invlist_C_array(UpperLatin1_invlist);
- PL_utf8_foldable = _new_invlist_C_array(_Perl_Any_Folds_invlist);
- PL_HasMultiCharFold =
- _new_invlist_C_array(_Perl_Folds_To_Multi_Char_invlist);
- }
-#endif
-
- pRExC_state->code_blocks = NULL;
- pRExC_state->num_code_blocks = 0;
-
- if (is_bare_re)
- *is_bare_re = FALSE;
-
- if (expr && (expr->op_type == OP_LIST ||
- (expr->op_type == OP_NULL && expr->op_targ == OP_LIST))) {
- /* allocate code_blocks if needed */
- OP *o;
- int ncode = 0;
-
- for (o = cLISTOPx(expr)->op_first; o; o = OP_SIBLING(o))
- if (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL))
- ncode++; /* count of DO blocks */
- if (ncode) {
- pRExC_state->num_code_blocks = ncode;
- Newx(pRExC_state->code_blocks, ncode, struct reg_code_block);
- }
- }
-
- if (!pat_count) {
- /* compile-time pattern with just OP_CONSTs and DO blocks */
-
- int n;
- OP *o;
-
- /* find how many CONSTs there are */
- assert(expr);
- n = 0;
- if (expr->op_type == OP_CONST)
- n = 1;
- else
- for (o = cLISTOPx(expr)->op_first; o; o = OP_SIBLING(o)) {
- if (o->op_type == OP_CONST)
- n++;
- }
-
- /* fake up an SV array */
-
- assert(!new_patternp);
- Newx(new_patternp, n, SV*);
- SAVEFREEPV(new_patternp);
- pat_count = n;
-
- n = 0;
- if (expr->op_type == OP_CONST)
- new_patternp[n] = cSVOPx_sv(expr);
- else
- for (o = cLISTOPx(expr)->op_first; o; o = OP_SIBLING(o)) {
- if (o->op_type == OP_CONST)
- new_patternp[n++] = cSVOPo_sv;
- }
-
- }
-
- DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log,
- "Assembling pattern from %d elements%s\n", pat_count,
- orig_rx_flags & RXf_SPLIT ? " for split" : ""));
-
- /* set expr to the first arg op */
-
- if (pRExC_state->num_code_blocks
- && expr->op_type != OP_CONST)
- {
- expr = cLISTOPx(expr)->op_first;
- assert( expr->op_type == OP_PUSHMARK
- || (expr->op_type == OP_NULL && expr->op_targ == OP_PUSHMARK)
- || expr->op_type == OP_PADRANGE);
- expr = OP_SIBLING(expr);
- }
-
- pat = S_concat_pat(aTHX_ pRExC_state, NULL, new_patternp, pat_count,
- expr, &recompile, NULL);
-
- /* handle bare (possibly after overloading) regex: foo =~ $re */
- {
- SV *re = pat;
- if (SvROK(re))
- re = SvRV(re);
- if (SvTYPE(re) == SVt_REGEXP) {
- if (is_bare_re)
- *is_bare_re = TRUE;
- SvREFCNT_inc(re);
- Safefree(pRExC_state->code_blocks);
- DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log,
- "Precompiled pattern%s\n",
- orig_rx_flags & RXf_SPLIT ? " for split" : ""));
-
- return (REGEXP*)re;
- }
- }
-
- exp = SvPV_nomg(pat, plen);
-
- if (!eng->op_comp) {
- if ((SvUTF8(pat) && IN_BYTES)
- || SvGMAGICAL(pat) || SvAMAGIC(pat))
- {
- /* make a temporary copy; either to convert to bytes,
- * or to avoid repeating get-magic / overloaded stringify */
- pat = newSVpvn_flags(exp, plen, SVs_TEMP |
- (IN_BYTES ? 0 : SvUTF8(pat)));
- }
- Safefree(pRExC_state->code_blocks);
- return CALLREGCOMP_ENG(eng, pat, orig_rx_flags);
- }
-
- /* ignore the utf8ness if the pattern is 0 length */
- RExC_utf8 = RExC_orig_utf8 = (plen == 0 || IN_BYTES) ? 0 : SvUTF8(pat);
- RExC_uni_semantics = 0;
- RExC_contains_locale = 0;
- RExC_contains_i = 0;
- pRExC_state->runtime_code_qr = NULL;
-
- DEBUG_COMPILE_r({
- SV *dsv= sv_newmortal();
- RE_PV_QUOTED_DECL(s, RExC_utf8, dsv, exp, plen, 60);
- PerlIO_printf(Perl_debug_log, "%sCompiling REx%s %s\n",
- PL_colors[4],PL_colors[5],s);
- });
-
- redo_first_pass:
- /* we jump here if we upgrade the pattern to utf8 and have to
- * recompile */
-
- if ((pm_flags & PMf_USE_RE_EVAL)
- /* this second condition covers the non-regex literal case,
- * i.e. $foo =~ '(?{})'. */
- || (IN_PERL_COMPILETIME && (PL_hints & HINT_RE_EVAL))
- )
- runtime_code = S_has_runtime_code(aTHX_ pRExC_state, exp, plen);
-
- /* return old regex if pattern hasn't changed */
- /* XXX: note in the below we have to check the flags as well as the
- * pattern.
- *
- * Things get a touch tricky as we have to compare the utf8 flag
- * independently from the compile flags. */
-
- if ( old_re
- && !recompile
- && !!RX_UTF8(old_re) == !!RExC_utf8
- && ( RX_COMPFLAGS(old_re) == ( orig_rx_flags & RXf_PMf_FLAGCOPYMASK ) )
- && RX_PRECOMP(old_re)
- && RX_PRELEN(old_re) == plen
- && memEQ(RX_PRECOMP(old_re), exp, plen)
- && !runtime_code /* with runtime code, always recompile */ )
- {
- Safefree(pRExC_state->code_blocks);
- return old_re;
- }
-
- rx_flags = orig_rx_flags;
-
- if (rx_flags & PMf_FOLD) {
- RExC_contains_i = 1;
- }
- if (RExC_utf8 && initial_charset == REGEX_DEPENDS_CHARSET) {
-
- /* Set to use unicode semantics if the pattern is in utf8 and has the
- * 'depends' charset specified, as it means unicode when utf8 */
- set_regex_charset(&rx_flags, REGEX_UNICODE_CHARSET);
- }
-
- RExC_precomp = exp;
- RExC_flags = rx_flags;
- RExC_pm_flags = pm_flags;
-
- if (runtime_code) {
- if (TAINTING_get && TAINT_get)
- Perl_croak(aTHX_ "Eval-group in insecure regular expression");
-
- if (!S_compile_runtime_code(aTHX_ pRExC_state, exp, plen)) {
- /* whoops, we have a non-utf8 pattern, whilst run-time code
- * got compiled as utf8. Try again with a utf8 pattern */
- S_pat_upgrade_to_utf8(aTHX_ pRExC_state, &exp, &plen,
- pRExC_state->num_code_blocks);
- goto redo_first_pass;
- }
- }
- assert(!pRExC_state->runtime_code_qr);
-
- RExC_sawback = 0;
-
- RExC_seen = 0;
- RExC_maxlen = 0;
- RExC_in_lookbehind = 0;
- RExC_seen_zerolen = *exp == '^' ? -1 : 0;
- RExC_extralen = 0;
- RExC_override_recoding = 0;
- RExC_in_multi_char_class = 0;
-
- /* First pass: determine size, legality. */
- RExC_parse = exp;
- RExC_start = exp;
- RExC_end = exp + plen;
- RExC_naughty = 0;
- RExC_npar = 1;
- RExC_nestroot = 0;
- RExC_size = 0L;
- RExC_emit = (regnode *) &RExC_emit_dummy;
- RExC_whilem_seen = 0;
- RExC_open_parens = NULL;
- RExC_close_parens = NULL;
- RExC_opend = NULL;
- RExC_paren_names = NULL;
-#ifdef DEBUGGING
- RExC_paren_name_list = NULL;
-#endif
- RExC_recurse = NULL;
- RExC_study_chunk_recursed = NULL;
- RExC_study_chunk_recursed_bytes= 0;
- RExC_recurse_count = 0;
- pRExC_state->code_index = 0;
-
-#if 0 /* REGC() is (currently) a NOP at the first pass.
- * Clever compilers notice this and complain. --jhi */
- REGC((U8)REG_MAGIC, (char*)RExC_emit);
-#endif
- DEBUG_PARSE_r(
- PerlIO_printf(Perl_debug_log, "Starting first pass (sizing)\n");
- RExC_lastnum=0;
- RExC_lastparse=NULL;
- );
- /* reg may croak on us, not giving us a chance to free
- pRExC_state->code_blocks. We cannot SAVEFREEPV it now, as we may
- need it to survive as long as the regexp (qr/(?{})/).
- We must check that code_blocksv is not already set, because we may
- have jumped back to restart the sizing pass. */
- if (pRExC_state->code_blocks && !code_blocksv) {
- code_blocksv = newSV_type(SVt_PV);
- SAVEFREESV(code_blocksv);
- SvPV_set(code_blocksv, (char *)pRExC_state->code_blocks);
- SvLEN_set(code_blocksv, 1); /*sufficient to make sv_clear free it*/
- }
- if (reg(pRExC_state, 0, &flags,1) == NULL) {
- /* It's possible to write a regexp in ascii that represents Unicode
- codepoints outside of the byte range, such as via \x{100}. If we
- detect such a sequence we have to convert the entire pattern to utf8
- and then recompile, as our sizing calculation will have been based
- on 1 byte == 1 character, but we will need to use utf8 to encode
- at least some part of the pattern, and therefore must convert the whole
- thing.
- -- dmq */
- if (flags & RESTART_UTF8) {
- S_pat_upgrade_to_utf8(aTHX_ pRExC_state, &exp, &plen,
- pRExC_state->num_code_blocks);
- goto redo_first_pass;
- }
- Perl_croak(aTHX_ "panic: reg returned NULL to re_op_compile for sizing pass, flags=%#"UVxf"", (UV) flags);
- }
- if (code_blocksv)
- SvLEN_set(code_blocksv,0); /* no you can't have it, sv_clear */
-
- DEBUG_PARSE_r({
- PerlIO_printf(Perl_debug_log,
- "Required size %"IVdf" nodes\n"
- "Starting second pass (creation)\n",
- (IV)RExC_size);
- RExC_lastnum=0;
- RExC_lastparse=NULL;
- });
-
- /* The first pass could have found things that force Unicode semantics */
- if ((RExC_utf8 || RExC_uni_semantics)
- && get_regex_charset(rx_flags) == REGEX_DEPENDS_CHARSET)
- {
- set_regex_charset(&rx_flags, REGEX_UNICODE_CHARSET);
- }
-
- /* Small enough for pointer-storage convention?
- If extralen==0, this means that we will not need long jumps. */
- if (RExC_size >= 0x10000L && RExC_extralen)
- RExC_size += RExC_extralen;
- else
- RExC_extralen = 0;
- if (RExC_whilem_seen > 15)
- RExC_whilem_seen = 15;
-
- /* Allocate space and zero-initialize. Note, the two step process
- of zeroing when in debug mode, thus anything assigned has to
- happen after that */
- rx = (REGEXP*) newSV_type(SVt_REGEXP);
- r = ReANY(rx);
- Newxc(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode),
- char, regexp_internal);
- if ( r == NULL || ri == NULL )
- FAIL("Regexp out of space");
-#ifdef DEBUGGING
- /* avoid reading uninitialized memory in DEBUGGING code in study_chunk() */
- Zero(ri, sizeof(regexp_internal) + (unsigned)RExC_size * sizeof(regnode),
- char);
-#else
- /* bulk initialize base fields with 0. */
- Zero(ri, sizeof(regexp_internal), char);
-#endif
-
- /* non-zero initialization begins here */
- RXi_SET( r, ri );
- r->engine= eng;
- r->extflags = rx_flags;
- RXp_COMPFLAGS(r) = orig_rx_flags & RXf_PMf_FLAGCOPYMASK;
-
- if (pm_flags & PMf_IS_QR) {
- ri->code_blocks = pRExC_state->code_blocks;
- ri->num_code_blocks = pRExC_state->num_code_blocks;
- }
- else
- {
- int n;
- for (n = 0; n < pRExC_state->num_code_blocks; n++)
- if (pRExC_state->code_blocks[n].src_regex)
- SAVEFREESV(pRExC_state->code_blocks[n].src_regex);
- SAVEFREEPV(pRExC_state->code_blocks);
- }
-
- {
- bool has_p = ((r->extflags & RXf_PMf_KEEPCOPY) == RXf_PMf_KEEPCOPY);
- bool has_charset = (get_regex_charset(r->extflags)
- != REGEX_DEPENDS_CHARSET);
-
- /* The caret is output if there are any defaults: if not all the STD
- * flags are set, or if no character set specifier is needed */
- bool has_default =
- (((r->extflags & RXf_PMf_STD_PMMOD) != RXf_PMf_STD_PMMOD)
- || ! has_charset);
- bool has_runon = ((RExC_seen & REG_RUN_ON_COMMENT_SEEN)
- == REG_RUN_ON_COMMENT_SEEN);
- U16 reganch = (U16)((r->extflags & RXf_PMf_STD_PMMOD)
- >> RXf_PMf_STD_PMMOD_SHIFT);
- const char *fptr = STD_PAT_MODS; /*"msix"*/
- char *p;
- /* Allocate for the worst case, which is all the std flags are turned
- * on. If more precision is desired, we could do a population count of
- * the flags set. This could be done with a small lookup table, or by
- * shifting, masking and adding, or even, when available, assembly
- * language for a machine-language population count.
- * We never output a minus, as all those are defaults, so are
- * covered by the caret */
- const STRLEN wraplen = plen + has_p + has_runon
- + has_default /* If needs a caret */
-
- /* If needs a character set specifier */
- + ((has_charset) ? MAX_CHARSET_NAME_LENGTH : 0)
- + (sizeof(STD_PAT_MODS) - 1)
- + (sizeof("(?:)") - 1);
-
- Newx(p, wraplen + 1, char); /* +1 for the ending NUL */
- r->xpv_len_u.xpvlenu_pv = p;
- if (RExC_utf8)
- SvFLAGS(rx) |= SVf_UTF8;
- *p++='('; *p++='?';
-
- /* If a default, cover it using the caret */
- if (has_default) {
- *p++= DEFAULT_PAT_MOD;
- }
- if (has_charset) {
- STRLEN len;
- const char* const name = get_regex_charset_name(r->extflags, &len);
- Copy(name, p, len, char);
- p += len;
- }
- if (has_p)
- *p++ = KEEPCOPY_PAT_MOD; /*'p'*/
- {
- char ch;
- while((ch = *fptr++)) {
- if(reganch & 1)
- *p++ = ch;
- reganch >>= 1;
- }
- }
-
- *p++ = ':';
- Copy(RExC_precomp, p, plen, char);
- assert ((RX_WRAPPED(rx) - p) < 16);
- r->pre_prefix = p - RX_WRAPPED(rx);
- p += plen;
- if (has_runon)
- *p++ = '\n';
- *p++ = ')';
- *p = 0;
- SvCUR_set(rx, p - RX_WRAPPED(rx));
- }
-
- r->intflags = 0;
- r->nparens = RExC_npar - 1; /* set early to validate backrefs */
-
- /* setup various meta data about recursion, this all requires
- * RExC_npar to be correctly set, and a bit later on we clear it */
- if (RExC_seen & REG_RECURSE_SEEN) {
- Newxz(RExC_open_parens, RExC_npar,regnode *);
- SAVEFREEPV(RExC_open_parens);
- Newxz(RExC_close_parens,RExC_npar,regnode *);
- SAVEFREEPV(RExC_close_parens);
- }
- if (RExC_seen & (REG_RECURSE_SEEN | REG_GOSTART_SEEN)) {
- /* Note, RExC_npar is 1 + the number of parens in a pattern.
- * So its 1 if there are no parens. */
- RExC_study_chunk_recursed_bytes= (RExC_npar >> 3) +
- ((RExC_npar & 0x07) != 0);
- Newx(RExC_study_chunk_recursed,
- RExC_study_chunk_recursed_bytes * RExC_npar, U8);
- SAVEFREEPV(RExC_study_chunk_recursed);
- }
-
- /* Useful during FAIL. */
-#ifdef RE_TRACK_PATTERN_OFFSETS
- Newxz(ri->u.offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
- DEBUG_OFFSETS_r(PerlIO_printf(Perl_debug_log,
- "%s %"UVuf" bytes for offset annotations.\n",
- ri->u.offsets ? "Got" : "Couldn't get",
- (UV)((2*RExC_size+1) * sizeof(U32))));
-#endif
- SetProgLen(ri,RExC_size);
- RExC_rx_sv = rx;
- RExC_rx = r;
- RExC_rxi = ri;
- REH_CALL_COMP_BEGIN_HOOK(pRExC_state->rx);
-
- /* Second pass: emit code. */
- RExC_flags = rx_flags; /* don't let top level (?i) bleed */
- RExC_pm_flags = pm_flags;
- RExC_parse = exp;
- RExC_end = exp + plen;
- RExC_naughty = 0;
- RExC_npar = 1;
- RExC_emit_start = ri->program;
- RExC_emit = ri->program;
- RExC_emit_bound = ri->program + RExC_size + 1;
- pRExC_state->code_index = 0;
-
- REGC((U8)REG_MAGIC, (char*) RExC_emit++);
- if (reg(pRExC_state, 0, &flags,1) == NULL) {
- ReREFCNT_dec(rx);
- Perl_croak(aTHX_ "panic: reg returned NULL to re_op_compile for generation pass, flags=%#"UVxf"", (UV) flags);
- }
- /* XXXX To minimize changes to RE engine we always allocate
- 3-units-long substrs field. */
- Newx(r->substrs, 1, struct reg_substr_data);
- if (RExC_recurse_count) {
- Newxz(RExC_recurse,RExC_recurse_count,regnode *);
- SAVEFREEPV(RExC_recurse);
- }
-
-reStudy:
- r->minlen = minlen = sawlookahead = sawplus = sawopen = sawminmod = 0;
- Zero(r->substrs, 1, struct reg_substr_data);
- if (RExC_study_chunk_recursed)
- Zero(RExC_study_chunk_recursed,
- RExC_study_chunk_recursed_bytes * RExC_npar, U8);
-
-#ifdef TRIE_STUDY_OPT
- if (!restudied) {
- StructCopy(&zero_scan_data, &data, scan_data_t);
- copyRExC_state = RExC_state;
- } else {
- U32 seen=RExC_seen;
- DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log,"Restudying\n"));
-
- RExC_state = copyRExC_state;
- if (seen & REG_TOP_LEVEL_BRANCHES_SEEN)
- RExC_seen |= REG_TOP_LEVEL_BRANCHES_SEEN;
- else
- RExC_seen &= ~REG_TOP_LEVEL_BRANCHES_SEEN;
- StructCopy(&zero_scan_data, &data, scan_data_t);
- }
-#else
- StructCopy(&zero_scan_data, &data, scan_data_t);
-#endif
-
- /* Dig out information for optimizations. */
- r->extflags = RExC_flags; /* was pm_op */
- /*dmq: removed as part of de-PMOP: pm->op_pmflags = RExC_flags; */
-
- if (UTF)
- SvUTF8_on(rx); /* Unicode in it? */
- ri->regstclass = NULL;
- if (RExC_naughty >= 10) /* Probably an expensive pattern. */
- r->intflags |= PREGf_NAUGHTY;
- scan = ri->program + 1; /* First BRANCH. */
-
- /* testing for BRANCH here tells us whether there is "must appear"
- data in the pattern. If there is then we can use it for optimisations */
- if (!(RExC_seen & REG_TOP_LEVEL_BRANCHES_SEEN)) { /* Only one top-level choice.
- */
- SSize_t fake;
- STRLEN longest_float_length, longest_fixed_length;
- regnode_ssc ch_class; /* pointed to by data */
- int stclass_flag;
- SSize_t last_close = 0; /* pointed to by data */
- regnode *first= scan;
- regnode *first_next= regnext(first);
- /*
- * Skip introductions and multiplicators >= 1
- * so that we can extract the 'meat' of the pattern that must
- * match in the large if() sequence following.
- * NOTE that EXACT is NOT covered here, as it is normally
- * picked up by the optimiser separately.
- *
- * This is unfortunate as the optimiser isnt handling lookahead
- * properly currently.
- *
- */
- while ((OP(first) == OPEN && (sawopen = 1)) ||
- /* An OR of *one* alternative - should not happen now. */
- (OP(first) == BRANCH && OP(first_next) != BRANCH) ||
- /* for now we can't handle lookbehind IFMATCH*/
- (OP(first) == IFMATCH && !first->flags && (sawlookahead = 1)) ||
- (OP(first) == PLUS) ||
- (OP(first) == MINMOD) ||
- /* An {n,m} with n>0 */
- (PL_regkind[OP(first)] == CURLY && ARG1(first) > 0) ||
- (OP(first) == NOTHING && PL_regkind[OP(first_next)] != END ))
- {
- /*
- * the only op that could be a regnode is PLUS, all the rest
- * will be regnode_1 or regnode_2.
- *
- * (yves doesn't think this is true)
- */
- if (OP(first) == PLUS)
- sawplus = 1;
- else {
- if (OP(first) == MINMOD)
- sawminmod = 1;
- first += regarglen[OP(first)];
- }
- first = NEXTOPER(first);
- first_next= regnext(first);
- }
-
- /* Starting-point info. */
- again:
- DEBUG_PEEP("first:",first,0);
- /* Ignore EXACT as we deal with it later. */
- if (PL_regkind[OP(first)] == EXACT) {
- if (OP(first) == EXACT)
- NOOP; /* Empty, get anchored substr later. */
- else
- ri->regstclass = first;
- }
-#ifdef TRIE_STCLASS
- else if (PL_regkind[OP(first)] == TRIE &&
- ((reg_trie_data *)ri->data->data[ ARG(first) ])->minlen>0)
- {
- /* this can happen only on restudy */
- ri->regstclass = construct_ahocorasick_from_trie(pRExC_state, (regnode *)first, 0);
- }
-#endif
- else if (REGNODE_SIMPLE(OP(first)))
- ri->regstclass = first;
- else if (PL_regkind[OP(first)] == BOUND ||
- PL_regkind[OP(first)] == NBOUND)
- ri->regstclass = first;
- else if (PL_regkind[OP(first)] == BOL) {
- r->intflags |= (OP(first) == MBOL
- ? PREGf_ANCH_MBOL
- : (OP(first) == SBOL
- ? PREGf_ANCH_SBOL
- : PREGf_ANCH_BOL));
- first = NEXTOPER(first);
- goto again;
- }
- else if (OP(first) == GPOS) {
- r->intflags |= PREGf_ANCH_GPOS;
- first = NEXTOPER(first);
- goto again;
- }
- else if ((!sawopen || !RExC_sawback) &&
- !sawlookahead &&
- (OP(first) == STAR &&
- PL_regkind[OP(NEXTOPER(first))] == REG_ANY) &&
- !(r->intflags & PREGf_ANCH) && !pRExC_state->num_code_blocks)
- {
- /* turn .* into ^.* with an implied $*=1 */
- const int type =
- (OP(NEXTOPER(first)) == REG_ANY)
- ? PREGf_ANCH_MBOL
- : PREGf_ANCH_SBOL;
- r->intflags |= (type | PREGf_IMPLICIT);
- first = NEXTOPER(first);
- goto again;
- }
- if (sawplus && !sawminmod && !sawlookahead
- && (!sawopen || !RExC_sawback)
- && !pRExC_state->num_code_blocks) /* May examine pos and $& */
- /* x+ must match at the 1st pos of run of x's */
- r->intflags |= PREGf_SKIP;
-
- /* Scan is after the zeroth branch, first is atomic matcher. */
-#ifdef TRIE_STUDY_OPT
- DEBUG_PARSE_r(
- if (!restudied)
- PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
- (IV)(first - scan + 1))
- );
-#else
- DEBUG_PARSE_r(
- PerlIO_printf(Perl_debug_log, "first at %"IVdf"\n",
- (IV)(first - scan + 1))
- );
-#endif
-
-
- /*
- * If there's something expensive in the r.e., find the
- * longest literal string that must appear and make it the
- * regmust. Resolve ties in favor of later strings, since
- * the regstart check works with the beginning of the r.e.
- * and avoiding duplication strengthens checking. Not a
- * strong reason, but sufficient in the absence of others.
- * [Now we resolve ties in favor of the earlier string if
- * it happens that c_offset_min has been invalidated, since the
- * earlier string may buy us something the later one won't.]
- */
-
- data.longest_fixed = newSVpvs("");
- data.longest_float = newSVpvs("");
- data.last_found = newSVpvs("");
- data.longest = &(data.longest_fixed);
- ENTER_with_name("study_chunk");
- SAVEFREESV(data.longest_fixed);
- SAVEFREESV(data.longest_float);
- SAVEFREESV(data.last_found);
- first = scan;
- if (!ri->regstclass) {
- ssc_init(pRExC_state, &ch_class);
- data.start_class = &ch_class;
- stclass_flag = SCF_DO_STCLASS_AND;
- } else /* XXXX Check for BOUND? */
- stclass_flag = 0;
- data.last_closep = &last_close;
-
- DEBUG_RExC_seen();
- minlen = study_chunk(pRExC_state, &first, &minlen, &fake,
- scan + RExC_size, /* Up to end */
- &data, -1, 0, NULL,
- SCF_DO_SUBSTR | SCF_WHILEM_VISITED_POS | stclass_flag
- | (restudied ? SCF_TRIE_DOING_RESTUDY : 0),
- 0);
-
-
- CHECK_RESTUDY_GOTO_butfirst(LEAVE_with_name("study_chunk"));
-
-
- if ( RExC_npar == 1 && data.longest == &(data.longest_fixed)
- && data.last_start_min == 0 && data.last_end > 0
- && !RExC_seen_zerolen
- && !(RExC_seen & REG_VERBARG_SEEN)
- && !(RExC_seen & REG_GPOS_SEEN)
- ){
- r->extflags |= RXf_CHECK_ALL;
- }
- scan_commit(pRExC_state, &data,&minlen,0);
-
- longest_float_length = CHR_SVLEN(data.longest_float);
-
- if (! ((SvCUR(data.longest_fixed) /* ok to leave SvCUR */
- && data.offset_fixed == data.offset_float_min
- && SvCUR(data.longest_fixed) == SvCUR(data.longest_float)))
- && S_setup_longest (aTHX_ pRExC_state,
- data.longest_float,
- &(r->float_utf8),
- &(r->float_substr),
- &(r->float_end_shift),
- data.lookbehind_float,
- data.offset_float_min,
- data.minlen_float,
- longest_float_length,
- cBOOL(data.flags & SF_FL_BEFORE_EOL),
- cBOOL(data.flags & SF_FL_BEFORE_MEOL)))
- {
- r->float_min_offset = data.offset_float_min - data.lookbehind_float;
- r->float_max_offset = data.offset_float_max;
- if (data.offset_float_max < SSize_t_MAX) /* Don't offset infinity */
- r->float_max_offset -= data.lookbehind_float;
- SvREFCNT_inc_simple_void_NN(data.longest_float);
- }
- else {
- r->float_substr = r->float_utf8 = NULL;
- longest_float_length = 0;
- }
-
- longest_fixed_length = CHR_SVLEN(data.longest_fixed);
-
- if (S_setup_longest (aTHX_ pRExC_state,
- data.longest_fixed,
- &(r->anchored_utf8),
- &(r->anchored_substr),
- &(r->anchored_end_shift),
- data.lookbehind_fixed,
- data.offset_fixed,
- data.minlen_fixed,
- longest_fixed_length,
- cBOOL(data.flags & SF_FIX_BEFORE_EOL),
- cBOOL(data.flags & SF_FIX_BEFORE_MEOL)))
- {
- r->anchored_offset = data.offset_fixed - data.lookbehind_fixed;
- SvREFCNT_inc_simple_void_NN(data.longest_fixed);
- }
- else {
- r->anchored_substr = r->anchored_utf8 = NULL;
- longest_fixed_length = 0;
- }
- LEAVE_with_name("study_chunk");
-
- if (ri->regstclass
- && (OP(ri->regstclass) == REG_ANY || OP(ri->regstclass) == SANY))
- ri->regstclass = NULL;
-
- if ((!(r->anchored_substr || r->anchored_utf8) || r->anchored_offset)
- && stclass_flag
- && ! (ANYOF_FLAGS(data.start_class) & ANYOF_EMPTY_STRING)
- && !ssc_is_anything(data.start_class))
- {
- const U32 n = add_data(pRExC_state, STR_WITH_LEN("f"));
-
- ssc_finalize(pRExC_state, data.start_class);
-
- Newx(RExC_rxi->data->data[n], 1, regnode_ssc);
- StructCopy(data.start_class,
- (regnode_ssc*)RExC_rxi->data->data[n],
- regnode_ssc);
- ri->regstclass = (regnode*)RExC_rxi->data->data[n];
- r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
- DEBUG_COMPILE_r({ SV *sv = sv_newmortal();
- regprop(r, sv, (regnode*)data.start_class, NULL);
- PerlIO_printf(Perl_debug_log,
- "synthetic stclass \"%s\".\n",
- SvPVX_const(sv));});
- data.start_class = NULL;
- }
-
- /* A temporary algorithm prefers floated substr to fixed one to dig
- * more info. */
- if (longest_fixed_length > longest_float_length) {
- r->substrs->check_ix = 0;
- r->check_end_shift = r->anchored_end_shift;
- r->check_substr = r->anchored_substr;
- r->check_utf8 = r->anchored_utf8;
- r->check_offset_min = r->check_offset_max = r->anchored_offset;
- if (r->intflags & (PREGf_ANCH_SBOL|PREGf_ANCH_GPOS))
- r->intflags |= PREGf_NOSCAN;
- }
- else {
- r->substrs->check_ix = 1;
- r->check_end_shift = r->float_end_shift;
- r->check_substr = r->float_substr;
- r->check_utf8 = r->float_utf8;
- r->check_offset_min = r->float_min_offset;
- r->check_offset_max = r->float_max_offset;
- }
- if ((r->check_substr || r->check_utf8) ) {
- r->extflags |= RXf_USE_INTUIT;
- if (SvTAIL(r->check_substr ? r->check_substr : r->check_utf8))
- r->extflags |= RXf_INTUIT_TAIL;
- }
- r->substrs->data[0].max_offset = r->substrs->data[0].min_offset;
-
- /* XXX Unneeded? dmq (shouldn't as this is handled elsewhere)
- if ( (STRLEN)minlen < longest_float_length )
- minlen= longest_float_length;
- if ( (STRLEN)minlen < longest_fixed_length )
- minlen= longest_fixed_length;
- */
- }
- else {
- /* Several toplevels. Best we can is to set minlen. */
- SSize_t fake;
- regnode_ssc ch_class;
- SSize_t last_close = 0;
-
- DEBUG_PARSE_r(PerlIO_printf(Perl_debug_log, "\nMulti Top Level\n"));
-
- scan = ri->program + 1;
- ssc_init(pRExC_state, &ch_class);
- data.start_class = &ch_class;
- data.last_closep = &last_close;
-
- DEBUG_RExC_seen();
- minlen = study_chunk(pRExC_state,
- &scan, &minlen, &fake, scan + RExC_size, &data, -1, 0, NULL,
- SCF_DO_STCLASS_AND|SCF_WHILEM_VISITED_POS|(restudied
- ? SCF_TRIE_DOING_RESTUDY
- : 0),
- 0);
-
- CHECK_RESTUDY_GOTO_butfirst(NOOP);
-
- r->check_substr = r->check_utf8 = r->anchored_substr = r->anchored_utf8
- = r->float_substr = r->float_utf8 = NULL;
-
- if (! (ANYOF_FLAGS(data.start_class) & ANYOF_EMPTY_STRING)
- && ! ssc_is_anything(data.start_class))
- {
- const U32 n = add_data(pRExC_state, STR_WITH_LEN("f"));
-
- ssc_finalize(pRExC_state, data.start_class);
-
- Newx(RExC_rxi->data->data[n], 1, regnode_ssc);
- StructCopy(data.start_class,
- (regnode_ssc*)RExC_rxi->data->data[n],
- regnode_ssc);
- ri->regstclass = (regnode*)RExC_rxi->data->data[n];
- r->intflags &= ~PREGf_SKIP; /* Used in find_byclass(). */
- DEBUG_COMPILE_r({ SV* sv = sv_newmortal();
- regprop(r, sv, (regnode*)data.start_class, NULL);
- PerlIO_printf(Perl_debug_log,
- "synthetic stclass \"%s\".\n",
- SvPVX_const(sv));});
- data.start_class = NULL;
- }
- }
-
- if (RExC_seen & REG_UNBOUNDED_QUANTIFIER_SEEN) {
- r->extflags |= RXf_UNBOUNDED_QUANTIFIER_SEEN;
- r->maxlen = REG_INFTY;
- }
- else {
- r->maxlen = RExC_maxlen;
- }
-
- /* Guard against an embedded (?=) or (?<=) with a longer minlen than
- the "real" pattern. */
- DEBUG_OPTIMISE_r({
- PerlIO_printf(Perl_debug_log,"minlen: %"IVdf" r->minlen:%"IVdf" maxlen:%ld\n",
- (IV)minlen, (IV)r->minlen, RExC_maxlen);
- });
- r->minlenret = minlen;
- if (r->minlen < minlen)
- r->minlen = minlen;
-
- if (RExC_seen & REG_GPOS_SEEN)
- r->intflags |= PREGf_GPOS_SEEN;
- if (RExC_seen & REG_LOOKBEHIND_SEEN)
- r->extflags |= RXf_NO_INPLACE_SUBST; /* inplace might break the
- lookbehind */
- if (pRExC_state->num_code_blocks)
- r->extflags |= RXf_EVAL_SEEN;
- if (RExC_seen & REG_CANY_SEEN)
- r->intflags |= PREGf_CANY_SEEN;
- if (RExC_seen & REG_VERBARG_SEEN)
- {
- r->intflags |= PREGf_VERBARG_SEEN;
- r->extflags |= RXf_NO_INPLACE_SUBST; /* don't understand this! Yves */
- }
- if (RExC_seen & REG_CUTGROUP_SEEN)
- r->intflags |= PREGf_CUTGROUP_SEEN;
- if (pm_flags & PMf_USE_RE_EVAL)
- r->intflags |= PREGf_USE_RE_EVAL;
- if (RExC_paren_names)
- RXp_PAREN_NAMES(r) = MUTABLE_HV(SvREFCNT_inc(RExC_paren_names));
- else
- RXp_PAREN_NAMES(r) = NULL;
-
- /* If we have seen an anchor in our pattern then we set the extflag RXf_IS_ANCHORED
- * so it can be used in pp.c */
- if (r->intflags & PREGf_ANCH)
- r->extflags |= RXf_IS_ANCHORED;
-
-
- {
- /* this is used to identify "special" patterns that might result
- * in Perl NOT calling the regex engine and instead doing the match "itself",
- * particularly special cases in split//. By having the regex compiler
- * do this pattern matching at a regop level (instead of by inspecting the pattern)
- * we avoid weird issues with equivalent patterns resulting in different behavior,
- * AND we allow non Perl engines to get the same optimizations by the setting the
- * flags appropriately - Yves */
- regnode *first = ri->program + 1;
- U8 fop = OP(first);
- regnode *next = NEXTOPER(first);
- U8 nop = OP(next);
-
- if (PL_regkind[fop] == NOTHING && nop == END)
- r->extflags |= RXf_NULL;
- else if (PL_regkind[fop] == BOL && nop == END)
- r->extflags |= RXf_START_ONLY;
- else if (fop == PLUS
- && PL_regkind[nop] == POSIXD && FLAGS(next) == _CC_SPACE
- && OP(regnext(first)) == END)
- r->extflags |= RXf_WHITE;
- else if ( r->extflags & RXf_SPLIT
- && fop == EXACT
- && STR_LEN(first) == 1
- && *(STRING(first)) == ' '
- && OP(regnext(first)) == END )
- r->extflags |= (RXf_SKIPWHITE|RXf_WHITE);
-
- }
-
- if (RExC_contains_locale) {
- RXp_EXTFLAGS(r) |= RXf_TAINTED;
- }
-
-#ifdef DEBUGGING
- if (RExC_paren_names) {
- ri->name_list_idx = add_data( pRExC_state, STR_WITH_LEN("a"));
- ri->data->data[ri->name_list_idx]
- = (void*)SvREFCNT_inc(RExC_paren_name_list);
- } else
-#endif
- ri->name_list_idx = 0;
-
- if (RExC_recurse_count) {
- for ( ; RExC_recurse_count ; RExC_recurse_count-- ) {
- const regnode *scan = RExC_recurse[RExC_recurse_count-1];
- ARG2L_SET( scan, RExC_open_parens[ARG(scan)-1] - scan );
- }
- }
- Newxz(r->offs, RExC_npar, regexp_paren_pair);
- /* assume we don't need to swap parens around before we match */
-
- DEBUG_DUMP_r({
- DEBUG_RExC_seen();
- PerlIO_printf(Perl_debug_log,"Final program:\n");
- regdump(r);
- });
-#ifdef RE_TRACK_PATTERN_OFFSETS
- DEBUG_OFFSETS_r(if (ri->u.offsets) {
- const STRLEN len = ri->u.offsets[0];
- STRLEN i;
- GET_RE_DEBUG_FLAGS_DECL;
- PerlIO_printf(Perl_debug_log,
- "Offsets: [%"UVuf"]\n\t", (UV)ri->u.offsets[0]);
- for (i = 1; i <= len; i++) {
- if (ri->u.offsets[i*2-1] || ri->u.offsets[i*2])
- PerlIO_printf(Perl_debug_log, "%"UVuf":%"UVuf"[%"UVuf"] ",
- (UV)i, (UV)ri->u.offsets[i*2-1], (UV)ri->u.offsets[i*2]);
- }
- PerlIO_printf(Perl_debug_log, "\n");
- });
-#endif
-
-#ifdef USE_ITHREADS
- /* under ithreads the ?pat? PMf_USED flag on the pmop is simulated
- * by setting the regexp SV to readonly-only instead. If the
- * pattern's been recompiled, the USEDness should remain. */
- if (old_re && SvREADONLY(old_re))
- SvREADONLY_on(rx);
-#endif
- return rx;
-}
-
-
-SV*
-Perl_reg_named_buff(pTHX_ REGEXP * const rx, SV * const key, SV * const value,
- const U32 flags)
-{
- PERL_ARGS_ASSERT_REG_NAMED_BUFF;
-
- PERL_UNUSED_ARG(value);
-
- if (flags & RXapif_FETCH) {
- return reg_named_buff_fetch(rx, key, flags);
- } else if (flags & (RXapif_STORE | RXapif_DELETE | RXapif_CLEAR)) {
- Perl_croak_no_modify();
- return NULL;
- } else if (flags & RXapif_EXISTS) {
- return reg_named_buff_exists(rx, key, flags)
- ? &PL_sv_yes
- : &PL_sv_no;
- } else if (flags & RXapif_REGNAMES) {
- return reg_named_buff_all(rx, flags);
- } else if (flags & (RXapif_SCALAR | RXapif_REGNAMES_COUNT)) {
- return reg_named_buff_scalar(rx, flags);
- } else {
- Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff", (int)flags);
- return NULL;
- }
-}
-
-SV*
-Perl_reg_named_buff_iter(pTHX_ REGEXP * const rx, const SV * const lastkey,
- const U32 flags)
-{
- PERL_ARGS_ASSERT_REG_NAMED_BUFF_ITER;
- PERL_UNUSED_ARG(lastkey);
-
- if (flags & RXapif_FIRSTKEY)
- return reg_named_buff_firstkey(rx, flags);
- else if (flags & RXapif_NEXTKEY)
- return reg_named_buff_nextkey(rx, flags);
- else {
- Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff_iter",
- (int)flags);
- return NULL;
- }
-}
-
-SV*
-Perl_reg_named_buff_fetch(pTHX_ REGEXP * const r, SV * const namesv,
- const U32 flags)
-{
- AV *retarray = NULL;
- SV *ret;
- struct regexp *const rx = ReANY(r);
-
- PERL_ARGS_ASSERT_REG_NAMED_BUFF_FETCH;
-
- if (flags & RXapif_ALL)
- retarray=newAV();
-
- if (rx && RXp_PAREN_NAMES(rx)) {
- HE *he_str = hv_fetch_ent( RXp_PAREN_NAMES(rx), namesv, 0, 0 );
- if (he_str) {
- IV i;
- SV* sv_dat=HeVAL(he_str);
- I32 *nums=(I32*)SvPVX(sv_dat);
- for ( i=0; i<SvIVX(sv_dat); i++ ) {
- if ((I32)(rx->nparens) >= nums[i]
- && rx->offs[nums[i]].start != -1
- && rx->offs[nums[i]].end != -1)
- {
- ret = newSVpvs("");
- CALLREG_NUMBUF_FETCH(r,nums[i],ret);
- if (!retarray)
- return ret;
- } else {
- if (retarray)
- ret = newSVsv(&PL_sv_undef);
- }
- if (retarray)
- av_push(retarray, ret);
- }
- if (retarray)
- return newRV_noinc(MUTABLE_SV(retarray));
- }
- }
- return NULL;
-}
-
-bool
-Perl_reg_named_buff_exists(pTHX_ REGEXP * const r, SV * const key,
- const U32 flags)
-{
- struct regexp *const rx = ReANY(r);
-
- PERL_ARGS_ASSERT_REG_NAMED_BUFF_EXISTS;
-
- if (rx && RXp_PAREN_NAMES(rx)) {
- if (flags & RXapif_ALL) {
- return hv_exists_ent(RXp_PAREN_NAMES(rx), key, 0);
- } else {
- SV *sv = CALLREG_NAMED_BUFF_FETCH(r, key, flags);
- if (sv) {
- SvREFCNT_dec_NN(sv);
- return TRUE;
- } else {
- return FALSE;
- }
- }
- } else {
- return FALSE;
- }
-}
-
-SV*
-Perl_reg_named_buff_firstkey(pTHX_ REGEXP * const r, const U32 flags)
-{
- struct regexp *const rx = ReANY(r);
-
- PERL_ARGS_ASSERT_REG_NAMED_BUFF_FIRSTKEY;
-
- if ( rx && RXp_PAREN_NAMES(rx) ) {
- (void)hv_iterinit(RXp_PAREN_NAMES(rx));
-
- return CALLREG_NAMED_BUFF_NEXTKEY(r, NULL, flags & ~RXapif_FIRSTKEY);
- } else {
- return FALSE;
- }
-}
-
-SV*
-Perl_reg_named_buff_nextkey(pTHX_ REGEXP * const r, const U32 flags)
-{
- struct regexp *const rx = ReANY(r);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REG_NAMED_BUFF_NEXTKEY;
-
- if (rx && RXp_PAREN_NAMES(rx)) {
- HV *hv = RXp_PAREN_NAMES(rx);
- HE *temphe;
- while ( (temphe = hv_iternext_flags(hv,0)) ) {
- IV i;
- IV parno = 0;
- SV* sv_dat = HeVAL(temphe);
- I32 *nums = (I32*)SvPVX(sv_dat);
- for ( i = 0; i < SvIVX(sv_dat); i++ ) {
- if ((I32)(rx->lastparen) >= nums[i] &&
- rx->offs[nums[i]].start != -1 &&
- rx->offs[nums[i]].end != -1)
- {
- parno = nums[i];
- break;
- }
- }
- if (parno || flags & RXapif_ALL) {
- return newSVhek(HeKEY_hek(temphe));
- }
- }
- }
- return NULL;
-}
-
-SV*
-Perl_reg_named_buff_scalar(pTHX_ REGEXP * const r, const U32 flags)
-{
- SV *ret;
- AV *av;
- SSize_t length;
- struct regexp *const rx = ReANY(r);
-
- PERL_ARGS_ASSERT_REG_NAMED_BUFF_SCALAR;
-
- if (rx && RXp_PAREN_NAMES(rx)) {
- if (flags & (RXapif_ALL | RXapif_REGNAMES_COUNT)) {
- return newSViv(HvTOTALKEYS(RXp_PAREN_NAMES(rx)));
- } else if (flags & RXapif_ONE) {
- ret = CALLREG_NAMED_BUFF_ALL(r, (flags | RXapif_REGNAMES));
- av = MUTABLE_AV(SvRV(ret));
- length = av_tindex(av);
- SvREFCNT_dec_NN(ret);
- return newSViv(length + 1);
- } else {
- Perl_croak(aTHX_ "panic: Unknown flags %d in named_buff_scalar",
- (int)flags);
- return NULL;
- }
- }
- return &PL_sv_undef;
-}
-
-SV*
-Perl_reg_named_buff_all(pTHX_ REGEXP * const r, const U32 flags)
-{
- struct regexp *const rx = ReANY(r);
- AV *av = newAV();
-
- PERL_ARGS_ASSERT_REG_NAMED_BUFF_ALL;
-
- if (rx && RXp_PAREN_NAMES(rx)) {
- HV *hv= RXp_PAREN_NAMES(rx);
- HE *temphe;
- (void)hv_iterinit(hv);
- while ( (temphe = hv_iternext_flags(hv,0)) ) {
- IV i;
- IV parno = 0;
- SV* sv_dat = HeVAL(temphe);
- I32 *nums = (I32*)SvPVX(sv_dat);
- for ( i = 0; i < SvIVX(sv_dat); i++ ) {
- if ((I32)(rx->lastparen) >= nums[i] &&
- rx->offs[nums[i]].start != -1 &&
- rx->offs[nums[i]].end != -1)
- {
- parno = nums[i];
- break;
- }
- }
- if (parno || flags & RXapif_ALL) {
- av_push(av, newSVhek(HeKEY_hek(temphe)));
- }
- }
- }
-
- return newRV_noinc(MUTABLE_SV(av));
-}
-
-void
-Perl_reg_numbered_buff_fetch(pTHX_ REGEXP * const r, const I32 paren,
- SV * const sv)
-{
- struct regexp *const rx = ReANY(r);
- char *s = NULL;
- SSize_t i = 0;
- SSize_t s1, t1;
- I32 n = paren;
-
- PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_FETCH;
-
- if ( n == RX_BUFF_IDX_CARET_PREMATCH
- || n == RX_BUFF_IDX_CARET_FULLMATCH
- || n == RX_BUFF_IDX_CARET_POSTMATCH
- )
- {
- bool keepcopy = cBOOL(rx->extflags & RXf_PMf_KEEPCOPY);
- if (!keepcopy) {
- /* on something like
- * $r = qr/.../;
- * /$qr/p;
- * the KEEPCOPY is set on the PMOP rather than the regex */
- if (PL_curpm && r == PM_GETRE(PL_curpm))
- keepcopy = cBOOL(PL_curpm->op_pmflags & PMf_KEEPCOPY);
- }
- if (!keepcopy)
- goto ret_undef;
- }
-
- if (!rx->subbeg)
- goto ret_undef;
-
- if (n == RX_BUFF_IDX_CARET_FULLMATCH)
- /* no need to distinguish between them any more */
- n = RX_BUFF_IDX_FULLMATCH;
-
- if ((n == RX_BUFF_IDX_PREMATCH || n == RX_BUFF_IDX_CARET_PREMATCH)
- && rx->offs[0].start != -1)
- {
- /* $`, ${^PREMATCH} */
- i = rx->offs[0].start;
- s = rx->subbeg;
- }
- else
- if ((n == RX_BUFF_IDX_POSTMATCH || n == RX_BUFF_IDX_CARET_POSTMATCH)
- && rx->offs[0].end != -1)
- {
- /* $', ${^POSTMATCH} */
- s = rx->subbeg - rx->suboffset + rx->offs[0].end;
- i = rx->sublen + rx->suboffset - rx->offs[0].end;
- }
- else
- if ( 0 <= n && n <= (I32)rx->nparens &&
- (s1 = rx->offs[n].start) != -1 &&
- (t1 = rx->offs[n].end) != -1)
- {
- /* $&, ${^MATCH}, $1 ... */
- i = t1 - s1;
- s = rx->subbeg + s1 - rx->suboffset;
- } else {
- goto ret_undef;
- }
-
- assert(s >= rx->subbeg);
- assert((STRLEN)rx->sublen >= (STRLEN)((s - rx->subbeg) + i) );
- if (i >= 0) {
-#ifdef NO_TAINT_SUPPORT
- sv_setpvn(sv, s, i);
-#else
- const int oldtainted = TAINT_get;
- TAINT_NOT;
- sv_setpvn(sv, s, i);
- TAINT_set(oldtainted);
-#endif
- if ( (rx->intflags & PREGf_CANY_SEEN)
- ? (RXp_MATCH_UTF8(rx)
- && (!i || is_utf8_string((U8*)s, i)))
- : (RXp_MATCH_UTF8(rx)) )
- {
- SvUTF8_on(sv);
- }
- else
- SvUTF8_off(sv);
- if (TAINTING_get) {
- if (RXp_MATCH_TAINTED(rx)) {
- if (SvTYPE(sv) >= SVt_PVMG) {
- MAGIC* const mg = SvMAGIC(sv);
- MAGIC* mgt;
- TAINT;
- SvMAGIC_set(sv, mg->mg_moremagic);
- SvTAINT(sv);
- if ((mgt = SvMAGIC(sv))) {
- mg->mg_moremagic = mgt;
- SvMAGIC_set(sv, mg);
- }
- } else {
- TAINT;
- SvTAINT(sv);
- }
- } else
- SvTAINTED_off(sv);
- }
- } else {
- ret_undef:
- sv_setsv(sv,&PL_sv_undef);
- return;
- }
-}
-
-void
-Perl_reg_numbered_buff_store(pTHX_ REGEXP * const rx, const I32 paren,
- SV const * const value)
-{
- PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_STORE;
-
- PERL_UNUSED_ARG(rx);
- PERL_UNUSED_ARG(paren);
- PERL_UNUSED_ARG(value);
-
- if (!PL_localizing)
- Perl_croak_no_modify();
-}
-
-I32
-Perl_reg_numbered_buff_length(pTHX_ REGEXP * const r, const SV * const sv,
- const I32 paren)
-{
- struct regexp *const rx = ReANY(r);
- I32 i;
- I32 s1, t1;
-
- PERL_ARGS_ASSERT_REG_NUMBERED_BUFF_LENGTH;
-
- if ( paren == RX_BUFF_IDX_CARET_PREMATCH
- || paren == RX_BUFF_IDX_CARET_FULLMATCH
- || paren == RX_BUFF_IDX_CARET_POSTMATCH
- )
- {
- bool keepcopy = cBOOL(rx->extflags & RXf_PMf_KEEPCOPY);
- if (!keepcopy) {
- /* on something like
- * $r = qr/.../;
- * /$qr/p;
- * the KEEPCOPY is set on the PMOP rather than the regex */
- if (PL_curpm && r == PM_GETRE(PL_curpm))
- keepcopy = cBOOL(PL_curpm->op_pmflags & PMf_KEEPCOPY);
- }
- if (!keepcopy)
- goto warn_undef;
- }
-
- /* Some of this code was originally in C<Perl_magic_len> in F<mg.c> */
- switch (paren) {
- case RX_BUFF_IDX_CARET_PREMATCH: /* ${^PREMATCH} */
- case RX_BUFF_IDX_PREMATCH: /* $` */
- if (rx->offs[0].start != -1) {
- i = rx->offs[0].start;
- if (i > 0) {
- s1 = 0;
- t1 = i;
- goto getlen;
- }
- }
- return 0;
-
- case RX_BUFF_IDX_CARET_POSTMATCH: /* ${^POSTMATCH} */
- case RX_BUFF_IDX_POSTMATCH: /* $' */
- if (rx->offs[0].end != -1) {
- i = rx->sublen - rx->offs[0].end;
- if (i > 0) {
- s1 = rx->offs[0].end;
- t1 = rx->sublen;
- goto getlen;
- }
- }
- return 0;
-
- default: /* $& / ${^MATCH}, $1, $2, ... */
- if (paren <= (I32)rx->nparens &&
- (s1 = rx->offs[paren].start) != -1 &&
- (t1 = rx->offs[paren].end) != -1)
- {
- i = t1 - s1;
- goto getlen;
- } else {
- warn_undef:
- if (ckWARN(WARN_UNINITIALIZED))
- report_uninit((const SV *)sv);
- return 0;
- }
- }
- getlen:
- if (i > 0 && RXp_MATCH_UTF8(rx)) {
- const char * const s = rx->subbeg - rx->suboffset + s1;
- const U8 *ep;
- STRLEN el;
-
- i = t1 - s1;
- if (is_utf8_string_loclen((U8*)s, i, &ep, &el))
- i = el;
- }
- return i;
-}
-
-SV*
-Perl_reg_qr_package(pTHX_ REGEXP * const rx)
-{
- PERL_ARGS_ASSERT_REG_QR_PACKAGE;
- PERL_UNUSED_ARG(rx);
- if (0)
- return NULL;
- else
- return newSVpvs("Regexp");
-}
-
-/* Scans the name of a named buffer from the pattern.
- * If flags is REG_RSN_RETURN_NULL returns null.
- * If flags is REG_RSN_RETURN_NAME returns an SV* containing the name
- * If flags is REG_RSN_RETURN_DATA returns the data SV* corresponding
- * to the parsed name as looked up in the RExC_paren_names hash.
- * If there is an error throws a vFAIL().. type exception.
- */
-
-#define REG_RSN_RETURN_NULL 0
-#define REG_RSN_RETURN_NAME 1
-#define REG_RSN_RETURN_DATA 2
-
-STATIC SV*
-S_reg_scan_name(pTHX_ RExC_state_t *pRExC_state, U32 flags)
-{
- char *name_start = RExC_parse;
-
- PERL_ARGS_ASSERT_REG_SCAN_NAME;
-
- assert (RExC_parse <= RExC_end);
- if (RExC_parse == RExC_end) NOOP;
- else if (isIDFIRST_lazy_if(RExC_parse, UTF)) {
- /* skip IDFIRST by using do...while */
- if (UTF)
- do {
- RExC_parse += UTF8SKIP(RExC_parse);
- } while (isWORDCHAR_utf8((U8*)RExC_parse));
- else
- do {
- RExC_parse++;
- } while (isWORDCHAR(*RExC_parse));
- } else {
- RExC_parse++; /* so the <- from the vFAIL is after the offending
- character */
- vFAIL("Group name must start with a non-digit word character");
- }
- if ( flags ) {
- SV* sv_name
- = newSVpvn_flags(name_start, (int)(RExC_parse - name_start),
- SVs_TEMP | (UTF ? SVf_UTF8 : 0));
- if ( flags == REG_RSN_RETURN_NAME)
- return sv_name;
- else if (flags==REG_RSN_RETURN_DATA) {
- HE *he_str = NULL;
- SV *sv_dat = NULL;
- if ( ! sv_name ) /* should not happen*/
- Perl_croak(aTHX_ "panic: no svname in reg_scan_name");
- if (RExC_paren_names)
- he_str = hv_fetch_ent( RExC_paren_names, sv_name, 0, 0 );
- if ( he_str )
- sv_dat = HeVAL(he_str);
- if ( ! sv_dat )
- vFAIL("Reference to nonexistent named group");
- return sv_dat;
- }
- else {
- Perl_croak(aTHX_ "panic: bad flag %lx in reg_scan_name",
- (unsigned long) flags);
- }
- assert(0); /* NOT REACHED */
- }
- return NULL;
-}
-
-#define DEBUG_PARSE_MSG(funcname) DEBUG_PARSE_r({ \
- int rem=(int)(RExC_end - RExC_parse); \
- int cut; \
- int num; \
- int iscut=0; \
- if (rem>10) { \
- rem=10; \
- iscut=1; \
- } \
- cut=10-rem; \
- if (RExC_lastparse!=RExC_parse) \
- PerlIO_printf(Perl_debug_log," >%.*s%-*s", \
- rem, RExC_parse, \
- cut + 4, \
- iscut ? "..." : "<" \
- ); \
- else \
- PerlIO_printf(Perl_debug_log,"%16s",""); \
- \
- if (SIZE_ONLY) \
- num = RExC_size + 1; \
- else \
- num=REG_NODE_NUM(RExC_emit); \
- if (RExC_lastnum!=num) \
- PerlIO_printf(Perl_debug_log,"|%4d",num); \
- else \
- PerlIO_printf(Perl_debug_log,"|%4s",""); \
- PerlIO_printf(Perl_debug_log,"|%*s%-4s", \
- (int)((depth*2)), "", \
- (funcname) \
- ); \
- RExC_lastnum=num; \
- RExC_lastparse=RExC_parse; \
-})
-
-
-
-#define DEBUG_PARSE(funcname) DEBUG_PARSE_r({ \
- DEBUG_PARSE_MSG((funcname)); \
- PerlIO_printf(Perl_debug_log,"%4s","\n"); \
-})
-#define DEBUG_PARSE_FMT(funcname,fmt,args) DEBUG_PARSE_r({ \
- DEBUG_PARSE_MSG((funcname)); \
- PerlIO_printf(Perl_debug_log,fmt "\n",args); \
-})
-
-/* This section of code defines the inversion list object and its methods. The
- * interfaces are highly subject to change, so as much as possible is static to
- * this file. An inversion list is here implemented as a malloc'd C UV array
- * as an SVt_INVLIST scalar.
- *
- * An inversion list for Unicode is an array of code points, sorted by ordinal
- * number. The zeroth element is the first code point in the list. The 1th
- * element is the first element beyond that not in the list. In other words,
- * the first range is
- * invlist[0]..(invlist[1]-1)
- * The other ranges follow. Thus every element whose index is divisible by two
- * marks the beginning of a range that is in the list, and every element not
- * divisible by two marks the beginning of a range not in the list. A single
- * element inversion list that contains the single code point N generally
- * consists of two elements
- * invlist[0] == N
- * invlist[1] == N+1
- * (The exception is when N is the highest representable value on the
- * machine, in which case the list containing just it would be a single
- * element, itself. By extension, if the last range in the list extends to
- * infinity, then the first element of that range will be in the inversion list
- * at a position that is divisible by two, and is the final element in the
- * list.)
- * Taking the complement (inverting) an inversion list is quite simple, if the
- * first element is 0, remove it; otherwise add a 0 element at the beginning.
- * This implementation reserves an element at the beginning of each inversion
- * list to always contain 0; there is an additional flag in the header which
- * indicates if the list begins at the 0, or is offset to begin at the next
- * element.
- *
- * More about inversion lists can be found in "Unicode Demystified"
- * Chapter 13 by Richard Gillam, published by Addison-Wesley.
- * More will be coming when functionality is added later.
- *
- * The inversion list data structure is currently implemented as an SV pointing
- * to an array of UVs that the SV thinks are bytes. This allows us to have an
- * array of UV whose memory management is automatically handled by the existing
- * facilities for SV's.
- *
- * Some of the methods should always be private to the implementation, and some
- * should eventually be made public */
-
-/* The header definitions are in F<inline_invlist.c> */
-
-PERL_STATIC_INLINE UV*
-S__invlist_array_init(SV* const invlist, const bool will_have_0)
-{
- /* Returns a pointer to the first element in the inversion list's array.
- * This is called upon initialization of an inversion list. Where the
- * array begins depends on whether the list has the code point U+0000 in it
- * or not. The other parameter tells it whether the code that follows this
- * call is about to put a 0 in the inversion list or not. The first
- * element is either the element reserved for 0, if TRUE, or the element
- * after it, if FALSE */
-
- bool* offset = get_invlist_offset_addr(invlist);
- UV* zero_addr = (UV *) SvPVX(invlist);
-
- PERL_ARGS_ASSERT__INVLIST_ARRAY_INIT;
-
- /* Must be empty */
- assert(! _invlist_len(invlist));
-
- *zero_addr = 0;
-
- /* 1^1 = 0; 1^0 = 1 */
- *offset = 1 ^ will_have_0;
- return zero_addr + *offset;
-}
-
-PERL_STATIC_INLINE UV*
-S_invlist_array(SV* const invlist)
-{
- /* Returns the pointer to the inversion list's array. Every time the
- * length changes, this needs to be called in case malloc or realloc moved
- * it */
-
- PERL_ARGS_ASSERT_INVLIST_ARRAY;
-
- /* Must not be empty. If these fail, you probably didn't check for <len>
- * being non-zero before trying to get the array */
- assert(_invlist_len(invlist));
-
- /* The very first element always contains zero, The array begins either
- * there, or if the inversion list is offset, at the element after it.
- * The offset header field determines which; it contains 0 or 1 to indicate
- * how much additionally to add */
- assert(0 == *(SvPVX(invlist)));
- return ((UV *) SvPVX(invlist) + *get_invlist_offset_addr(invlist));
-}
-
-PERL_STATIC_INLINE void
-S_invlist_set_len(pTHX_ SV* const invlist, const UV len, const bool offset)
-{
- /* Sets the current number of elements stored in the inversion list.
- * Updates SvCUR correspondingly */
- PERL_UNUSED_CONTEXT;
- PERL_ARGS_ASSERT_INVLIST_SET_LEN;
-
- assert(SvTYPE(invlist) == SVt_INVLIST);
-
- SvCUR_set(invlist,
- (len == 0)
- ? 0
- : TO_INTERNAL_SIZE(len + offset));
- assert(SvLEN(invlist) == 0 || SvCUR(invlist) <= SvLEN(invlist));
-}
-
-PERL_STATIC_INLINE IV*
-S_get_invlist_previous_index_addr(SV* invlist)
-{
- /* Return the address of the IV that is reserved to hold the cached index
- * */
- PERL_ARGS_ASSERT_GET_INVLIST_PREVIOUS_INDEX_ADDR;
-
- assert(SvTYPE(invlist) == SVt_INVLIST);
-
- return &(((XINVLIST*) SvANY(invlist))->prev_index);
-}
-
-PERL_STATIC_INLINE IV
-S_invlist_previous_index(SV* const invlist)
-{
- /* Returns cached index of previous search */
-
- PERL_ARGS_ASSERT_INVLIST_PREVIOUS_INDEX;
-
- return *get_invlist_previous_index_addr(invlist);
-}
-
-PERL_STATIC_INLINE void
-S_invlist_set_previous_index(SV* const invlist, const IV index)
-{
- /* Caches <index> for later retrieval */
-
- PERL_ARGS_ASSERT_INVLIST_SET_PREVIOUS_INDEX;
-
- assert(index == 0 || index < (int) _invlist_len(invlist));
-
- *get_invlist_previous_index_addr(invlist) = index;
-}
-
-PERL_STATIC_INLINE UV
-S_invlist_max(SV* const invlist)
-{
- /* Returns the maximum number of elements storable in the inversion list's
- * array, without having to realloc() */
-
- PERL_ARGS_ASSERT_INVLIST_MAX;
-
- assert(SvTYPE(invlist) == SVt_INVLIST);
-
- /* Assumes worst case, in which the 0 element is not counted in the
- * inversion list, so subtracts 1 for that */
- return SvLEN(invlist) == 0 /* This happens under _new_invlist_C_array */
- ? FROM_INTERNAL_SIZE(SvCUR(invlist)) - 1
- : FROM_INTERNAL_SIZE(SvLEN(invlist)) - 1;
-}
-
-#ifndef PERL_IN_XSUB_RE
-SV*
-Perl__new_invlist(pTHX_ IV initial_size)
-{
-
- /* Return a pointer to a newly constructed inversion list, with enough
- * space to store 'initial_size' elements. If that number is negative, a
- * system default is used instead */
-
- SV* new_list;
-
- if (initial_size < 0) {
- initial_size = 10;
- }
-
- /* Allocate the initial space */
- new_list = newSV_type(SVt_INVLIST);
-
- /* First 1 is in case the zero element isn't in the list; second 1 is for
- * trailing NUL */
- SvGROW(new_list, TO_INTERNAL_SIZE(initial_size + 1) + 1);
- invlist_set_len(new_list, 0, 0);
-
- /* Force iterinit() to be used to get iteration to work */
- *get_invlist_iter_addr(new_list) = (STRLEN) UV_MAX;
-
- *get_invlist_previous_index_addr(new_list) = 0;
-
- return new_list;
-}
-
-SV*
-Perl__new_invlist_C_array(pTHX_ const UV* const list)
-{
- /* Return a pointer to a newly constructed inversion list, initialized to
- * point to <list>, which has to be in the exact correct inversion list
- * form, including internal fields. Thus this is a dangerous routine that
- * should not be used in the wrong hands. The passed in 'list' contains
- * several header fields at the beginning that are not part of the
- * inversion list body proper */
-
- const STRLEN length = (STRLEN) list[0];
- const UV version_id = list[1];
- const bool offset = cBOOL(list[2]);
-#define HEADER_LENGTH 3
- /* If any of the above changes in any way, you must change HEADER_LENGTH
- * (if appropriate) and regenerate INVLIST_VERSION_ID by running
- * perl -E 'say int(rand 2**31-1)'
- */
-#define INVLIST_VERSION_ID 148565664 /* This is a combination of a version and
- data structure type, so that one being
- passed in can be validated to be an
- inversion list of the correct vintage.
- */
-
- SV* invlist = newSV_type(SVt_INVLIST);
-
- PERL_ARGS_ASSERT__NEW_INVLIST_C_ARRAY;
-
- if (version_id != INVLIST_VERSION_ID) {
- Perl_croak(aTHX_ "panic: Incorrect version for previously generated inversion list");
- }
-
- /* The generated array passed in includes header elements that aren't part
- * of the list proper, so start it just after them */
- SvPV_set(invlist, (char *) (list + HEADER_LENGTH));
-
- SvLEN_set(invlist, 0); /* Means we own the contents, and the system
- shouldn't touch it */
-
- *(get_invlist_offset_addr(invlist)) = offset;
-
- /* The 'length' passed to us is the physical number of elements in the
- * inversion list. But if there is an offset the logical number is one
- * less than that */
- invlist_set_len(invlist, length - offset, offset);
-
- invlist_set_previous_index(invlist, 0);
-
- /* Initialize the iteration pointer. */
- invlist_iterfinish(invlist);
-
- SvREADONLY_on(invlist);
-
- return invlist;
-}
-#endif /* ifndef PERL_IN_XSUB_RE */
-
-STATIC void
-S_invlist_extend(pTHX_ SV* const invlist, const UV new_max)
-{
- /* Grow the maximum size of an inversion list */
-
- PERL_ARGS_ASSERT_INVLIST_EXTEND;
-
- assert(SvTYPE(invlist) == SVt_INVLIST);
-
- /* Add one to account for the zero element at the beginning which may not
- * be counted by the calling parameters */
- SvGROW((SV *)invlist, TO_INTERNAL_SIZE(new_max + 1));
-}
-
-PERL_STATIC_INLINE void
-S_invlist_trim(SV* const invlist)
-{
- PERL_ARGS_ASSERT_INVLIST_TRIM;
-
- assert(SvTYPE(invlist) == SVt_INVLIST);
-
- /* Change the length of the inversion list to how many entries it currently
- * has */
- SvPV_shrink_to_cur((SV *) invlist);
-}
-
-STATIC void
-S__append_range_to_invlist(pTHX_ SV* const invlist,
- const UV start, const UV end)
-{
- /* Subject to change or removal. Append the range from 'start' to 'end' at
- * the end of the inversion list. The range must be above any existing
- * ones. */
-
- UV* array;
- UV max = invlist_max(invlist);
- UV len = _invlist_len(invlist);
- bool offset;
-
- PERL_ARGS_ASSERT__APPEND_RANGE_TO_INVLIST;
-
- if (len == 0) { /* Empty lists must be initialized */
- offset = start != 0;
- array = _invlist_array_init(invlist, ! offset);
- }
- else {
- /* Here, the existing list is non-empty. The current max entry in the
- * list is generally the first value not in the set, except when the
- * set extends to the end of permissible values, in which case it is
- * the first entry in that final set, and so this call is an attempt to
- * append out-of-order */
-
- UV final_element = len - 1;
- array = invlist_array(invlist);
- if (array[final_element] > start
- || ELEMENT_RANGE_MATCHES_INVLIST(final_element))
- {
- Perl_croak(aTHX_ "panic: attempting to append to an inversion list, but wasn't at the end of the list, final=%"UVuf", start=%"UVuf", match=%c",
- array[final_element], start,
- ELEMENT_RANGE_MATCHES_INVLIST(final_element) ? 't' : 'f');
- }
-
- /* Here, it is a legal append. If the new range begins with the first
- * value not in the set, it is extending the set, so the new first
- * value not in the set is one greater than the newly extended range.
- * */
- offset = *get_invlist_offset_addr(invlist);
- if (array[final_element] == start) {
- if (end != UV_MAX) {
- array[final_element] = end + 1;
- }
- else {
- /* But if the end is the maximum representable on the machine,
- * just let the range that this would extend to have no end */
- invlist_set_len(invlist, len - 1, offset);
- }
- return;
- }
- }
-
- /* Here the new range doesn't extend any existing set. Add it */
-
- len += 2; /* Includes an element each for the start and end of range */
-
- /* If wll overflow the existing space, extend, which may cause the array to
- * be moved */
- if (max < len) {
- invlist_extend(invlist, len);
-
- /* Have to set len here to avoid assert failure in invlist_array() */
- invlist_set_len(invlist, len, offset);
-
- array = invlist_array(invlist);
- }
- else {
- invlist_set_len(invlist, len, offset);
- }
-
- /* The next item on the list starts the range, the one after that is
- * one past the new range. */
- array[len - 2] = start;
- if (end != UV_MAX) {
- array[len - 1] = end + 1;
- }
- else {
- /* But if the end is the maximum representable on the machine, just let
- * the range have no end */
- invlist_set_len(invlist, len - 1, offset);
- }
-}
-
-#ifndef PERL_IN_XSUB_RE
-
-IV
-Perl__invlist_search(SV* const invlist, const UV cp)
-{
- /* Searches the inversion list for the entry that contains the input code
- * point <cp>. If <cp> is not in the list, -1 is returned. Otherwise, the
- * return value is the index into the list's array of the range that
- * contains <cp> */
-
- IV low = 0;
- IV mid;
- IV high = _invlist_len(invlist);
- const IV highest_element = high - 1;
- const UV* array;
-
- PERL_ARGS_ASSERT__INVLIST_SEARCH;
-
- /* If list is empty, return failure. */
- if (high == 0) {
- return -1;
- }
-
- /* (We can't get the array unless we know the list is non-empty) */
- array = invlist_array(invlist);
-
- mid = invlist_previous_index(invlist);
- assert(mid >=0 && mid <= highest_element);
-
- /* <mid> contains the cache of the result of the previous call to this
- * function (0 the first time). See if this call is for the same result,
- * or if it is for mid-1. This is under the theory that calls to this
- * function will often be for related code points that are near each other.
- * And benchmarks show that caching gives better results. We also test
- * here if the code point is within the bounds of the list. These tests
- * replace others that would have had to be made anyway to make sure that
- * the array bounds were not exceeded, and these give us extra information
- * at the same time */
- if (cp >= array[mid]) {
- if (cp >= array[highest_element]) {
- return highest_element;
- }
-
- /* Here, array[mid] <= cp < array[highest_element]. This means that
- * the final element is not the answer, so can exclude it; it also
- * means that <mid> is not the final element, so can refer to 'mid + 1'
- * safely */
- if (cp < array[mid + 1]) {
- return mid;
- }
- high--;
- low = mid + 1;
- }
- else { /* cp < aray[mid] */
- if (cp < array[0]) { /* Fail if outside the array */
- return -1;
- }
- high = mid;
- if (cp >= array[mid - 1]) {
- goto found_entry;
- }
- }
-
- /* Binary search. What we are looking for is <i> such that
- * array[i] <= cp < array[i+1]
- * The loop below converges on the i+1. Note that there may not be an
- * (i+1)th element in the array, and things work nonetheless */
- while (low < high) {
- mid = (low + high) / 2;
- assert(mid <= highest_element);
- if (array[mid] <= cp) { /* cp >= array[mid] */
- low = mid + 1;
-
- /* We could do this extra test to exit the loop early.
- if (cp < array[low]) {
- return mid;
- }
- */
- }
- else { /* cp < array[mid] */
- high = mid;
- }
- }
-
- found_entry:
- high--;
- invlist_set_previous_index(invlist, high);
- return high;
-}
-
-void
-Perl__invlist_populate_swatch(SV* const invlist,
- const UV start, const UV end, U8* swatch)
-{
- /* populates a swatch of a swash the same way swatch_get() does in utf8.c,
- * but is used when the swash has an inversion list. This makes this much
- * faster, as it uses a binary search instead of a linear one. This is
- * intimately tied to that function, and perhaps should be in utf8.c,
- * except it is intimately tied to inversion lists as well. It assumes
- * that <swatch> is all 0's on input */
-
- UV current = start;
- const IV len = _invlist_len(invlist);
- IV i;
- const UV * array;
-
- PERL_ARGS_ASSERT__INVLIST_POPULATE_SWATCH;
-
- if (len == 0) { /* Empty inversion list */
- return;
- }
-
- array = invlist_array(invlist);
-
- /* Find which element it is */
- i = _invlist_search(invlist, start);
-
- /* We populate from <start> to <end> */
- while (current < end) {
- UV upper;
-
- /* The inversion list gives the results for every possible code point
- * after the first one in the list. Only those ranges whose index is
- * even are ones that the inversion list matches. For the odd ones,
- * and if the initial code point is not in the list, we have to skip
- * forward to the next element */
- if (i == -1 || ! ELEMENT_RANGE_MATCHES_INVLIST(i)) {
- i++;
- if (i >= len) { /* Finished if beyond the end of the array */
- return;
- }
- current = array[i];
- if (current >= end) { /* Finished if beyond the end of what we
- are populating */
- if (LIKELY(end < UV_MAX)) {
- return;
- }
-
- /* We get here when the upper bound is the maximum
- * representable on the machine, and we are looking for just
- * that code point. Have to special case it */
- i = len;
- goto join_end_of_list;
- }
- }
- assert(current >= start);
-
- /* The current range ends one below the next one, except don't go past
- * <end> */
- i++;
- upper = (i < len && array[i] < end) ? array[i] : end;
-
- /* Here we are in a range that matches. Populate a bit in the 3-bit U8
- * for each code point in it */
- for (; current < upper; current++) {
- const STRLEN offset = (STRLEN)(current - start);
- swatch[offset >> 3] |= 1 << (offset & 7);
- }
-
- join_end_of_list:
-
- /* Quit if at the end of the list */
- if (i >= len) {
-
- /* But first, have to deal with the highest possible code point on
- * the platform. The previous code assumes that <end> is one
- * beyond where we want to populate, but that is impossible at the
- * platform's infinity, so have to handle it specially */
- if (UNLIKELY(end == UV_MAX && ELEMENT_RANGE_MATCHES_INVLIST(len-1)))
- {
- const STRLEN offset = (STRLEN)(end - start);
- swatch[offset >> 3] |= 1 << (offset & 7);
- }
- return;
- }
-
- /* Advance to the next range, which will be for code points not in the
- * inversion list */
- current = array[i];
- }
-
- return;
-}
-
-void
-Perl__invlist_union_maybe_complement_2nd(pTHX_ SV* const a, SV* const b,
- const bool complement_b, SV** output)
-{
- /* Take the union of two inversion lists and point <output> to it. *output
- * SHOULD BE DEFINED upon input, and if it points to one of the two lists,
- * the reference count to that list will be decremented if not already a
- * temporary (mortal); otherwise *output will be made correspondingly
- * mortal. The first list, <a>, may be NULL, in which case a copy of the
- * second list is returned. If <complement_b> is TRUE, the union is taken
- * of the complement (inversion) of <b> instead of b itself.
- *
- * The basis for this comes from "Unicode Demystified" Chapter 13 by
- * Richard Gillam, published by Addison-Wesley, and explained at some
- * length there. The preface says to incorporate its examples into your
- * code at your own risk.
- *
- * The algorithm is like a merge sort.
- *
- * XXX A potential performance improvement is to keep track as we go along
- * if only one of the inputs contributes to the result, meaning the other
- * is a subset of that one. In that case, we can skip the final copy and
- * return the larger of the input lists, but then outside code might need
- * to keep track of whether to free the input list or not */
-
- const UV* array_a; /* a's array */
- const UV* array_b;
- UV len_a; /* length of a's array */
- UV len_b;
-
- SV* u; /* the resulting union */
- UV* array_u;
- UV len_u;
-
- UV i_a = 0; /* current index into a's array */
- UV i_b = 0;
- UV i_u = 0;
-
- /* running count, as explained in the algorithm source book; items are
- * stopped accumulating and are output when the count changes to/from 0.
- * The count is incremented when we start a range that's in the set, and
- * decremented when we start a range that's not in the set. So its range
- * is 0 to 2. Only when the count is zero is something not in the set.
- */
- UV count = 0;
-
- PERL_ARGS_ASSERT__INVLIST_UNION_MAYBE_COMPLEMENT_2ND;
- assert(a != b);
-
- /* If either one is empty, the union is the other one */
- if (a == NULL || ((len_a = _invlist_len(a)) == 0)) {
- bool make_temp = FALSE; /* Should we mortalize the result? */
-
- if (*output == a) {
- if (a != NULL) {
- if (! (make_temp = cBOOL(SvTEMP(a)))) {
- SvREFCNT_dec_NN(a);
- }
- }
- }
- if (*output != b) {
- *output = invlist_clone(b);
- if (complement_b) {
- _invlist_invert(*output);
- }
- } /* else *output already = b; */
-
- if (make_temp) {
- sv_2mortal(*output);
- }
- return;
- }
- else if ((len_b = _invlist_len(b)) == 0) {
- bool make_temp = FALSE;
- if (*output == b) {
- if (! (make_temp = cBOOL(SvTEMP(b)))) {
- SvREFCNT_dec_NN(b);
- }
- }
-
- /* The complement of an empty list is a list that has everything in it,
- * so the union with <a> includes everything too */
- if (complement_b) {
- if (a == *output) {
- if (! (make_temp = cBOOL(SvTEMP(a)))) {
- SvREFCNT_dec_NN(a);
- }
- }
- *output = _new_invlist(1);
- _append_range_to_invlist(*output, 0, UV_MAX);
- }
- else if (*output != a) {
- *output = invlist_clone(a);
- }
- /* else *output already = a; */
-
- if (make_temp) {
- sv_2mortal(*output);
- }
- return;
- }
-
- /* Here both lists exist and are non-empty */
- array_a = invlist_array(a);
- array_b = invlist_array(b);
-
- /* If are to take the union of 'a' with the complement of b, set it
- * up so are looking at b's complement. */
- if (complement_b) {
-
- /* To complement, we invert: if the first element is 0, remove it. To
- * do this, we just pretend the array starts one later */
- if (array_b[0] == 0) {
- array_b++;
- len_b--;
- }
- else {
-
- /* But if the first element is not zero, we pretend the list starts
- * at the 0 that is always stored immediately before the array. */
- array_b--;
- len_b++;
- }
- }
-
- /* Size the union for the worst case: that the sets are completely
- * disjoint */
- u = _new_invlist(len_a + len_b);
-
- /* Will contain U+0000 if either component does */
- array_u = _invlist_array_init(u, (len_a > 0 && array_a[0] == 0)
- || (len_b > 0 && array_b[0] == 0));
-
- /* Go through each list item by item, stopping when exhausted one of
- * them */
- while (i_a < len_a && i_b < len_b) {
- UV cp; /* The element to potentially add to the union's array */
- bool cp_in_set; /* is it in the the input list's set or not */
-
- /* We need to take one or the other of the two inputs for the union.
- * Since we are merging two sorted lists, we take the smaller of the
- * next items. In case of a tie, we take the one that is in its set
- * first. If we took one not in the set first, it would decrement the
- * count, possibly to 0 which would cause it to be output as ending the
- * range, and the next time through we would take the same number, and
- * output it again as beginning the next range. By doing it the
- * opposite way, there is no possibility that the count will be
- * momentarily decremented to 0, and thus the two adjoining ranges will
- * be seamlessly merged. (In a tie and both are in the set or both not
- * in the set, it doesn't matter which we take first.) */
- if (array_a[i_a] < array_b[i_b]
- || (array_a[i_a] == array_b[i_b]
- && ELEMENT_RANGE_MATCHES_INVLIST(i_a)))
- {
- cp_in_set = ELEMENT_RANGE_MATCHES_INVLIST(i_a);
- cp= array_a[i_a++];
- }
- else {
- cp_in_set = ELEMENT_RANGE_MATCHES_INVLIST(i_b);
- cp = array_b[i_b++];
- }
-
- /* Here, have chosen which of the two inputs to look at. Only output
- * if the running count changes to/from 0, which marks the
- * beginning/end of a range in that's in the set */
- if (cp_in_set) {
- if (count == 0) {
- array_u[i_u++] = cp;
- }
- count++;
- }
- else {
- count--;
- if (count == 0) {
- array_u[i_u++] = cp;
- }
- }
- }
-
- /* Here, we are finished going through at least one of the lists, which
- * means there is something remaining in at most one. We check if the list
- * that hasn't been exhausted is positioned such that we are in the middle
- * of a range in its set or not. (i_a and i_b point to the element beyond
- * the one we care about.) If in the set, we decrement 'count'; if 0, there
- * is potentially more to output.
- * There are four cases:
- * 1) Both weren't in their sets, count is 0, and remains 0. What's left
- * in the union is entirely from the non-exhausted set.
- * 2) Both were in their sets, count is 2. Nothing further should
- * be output, as everything that remains will be in the exhausted
- * list's set, hence in the union; decrementing to 1 but not 0 insures
- * that
- * 3) the exhausted was in its set, non-exhausted isn't, count is 1.
- * Nothing further should be output because the union includes
- * everything from the exhausted set. Not decrementing ensures that.
- * 4) the exhausted wasn't in its set, non-exhausted is, count is 1;
- * decrementing to 0 insures that we look at the remainder of the
- * non-exhausted set */
- if ((i_a != len_a && PREV_RANGE_MATCHES_INVLIST(i_a))
- || (i_b != len_b && PREV_RANGE_MATCHES_INVLIST(i_b)))
- {
- count--;
- }
-
- /* The final length is what we've output so far, plus what else is about to
- * be output. (If 'count' is non-zero, then the input list we exhausted
- * has everything remaining up to the machine's limit in its set, and hence
- * in the union, so there will be no further output. */
- len_u = i_u;
- if (count == 0) {
- /* At most one of the subexpressions will be non-zero */
- len_u += (len_a - i_a) + (len_b - i_b);
- }
-
- /* Set result to final length, which can change the pointer to array_u, so
- * re-find it */
- if (len_u != _invlist_len(u)) {
- invlist_set_len(u, len_u, *get_invlist_offset_addr(u));
- invlist_trim(u);
- array_u = invlist_array(u);
- }
-
- /* When 'count' is 0, the list that was exhausted (if one was shorter than
- * the other) ended with everything above it not in its set. That means
- * that the remaining part of the union is precisely the same as the
- * non-exhausted list, so can just copy it unchanged. (If both list were
- * exhausted at the same time, then the operations below will be both 0.)
- */
- if (count == 0) {
- IV copy_count; /* At most one will have a non-zero copy count */
- if ((copy_count = len_a - i_a) > 0) {
- Copy(array_a + i_a, array_u + i_u, copy_count, UV);
- }
- else if ((copy_count = len_b - i_b) > 0) {
- Copy(array_b + i_b, array_u + i_u, copy_count, UV);
- }
- }
-
- /* We may be removing a reference to one of the inputs. If so, the output
- * is made mortal if the input was. (Mortal SVs shouldn't have their ref
- * count decremented) */
- if (a == *output || b == *output) {
- assert(! invlist_is_iterating(*output));
- if ((SvTEMP(*output))) {
- sv_2mortal(u);
- }
- else {
- SvREFCNT_dec_NN(*output);
- }
- }
-
- *output = u;
-
- return;
-}
-
-void
-Perl__invlist_intersection_maybe_complement_2nd(pTHX_ SV* const a, SV* const b,
- const bool complement_b, SV** i)
-{
- /* Take the intersection of two inversion lists and point <i> to it. *i
- * SHOULD BE DEFINED upon input, and if it points to one of the two lists,
- * the reference count to that list will be decremented if not already a
- * temporary (mortal); otherwise *i will be made correspondingly mortal.
- * The first list, <a>, may be NULL, in which case an empty list is
- * returned. If <complement_b> is TRUE, the result will be the
- * intersection of <a> and the complement (or inversion) of <b> instead of
- * <b> directly.
- *
- * The basis for this comes from "Unicode Demystified" Chapter 13 by
- * Richard Gillam, published by Addison-Wesley, and explained at some
- * length there. The preface says to incorporate its examples into your
- * code at your own risk. In fact, it had bugs
- *
- * The algorithm is like a merge sort, and is essentially the same as the
- * union above
- */
-
- const UV* array_a; /* a's array */
- const UV* array_b;
- UV len_a; /* length of a's array */
- UV len_b;
-
- SV* r; /* the resulting intersection */
- UV* array_r;
- UV len_r;
-
- UV i_a = 0; /* current index into a's array */
- UV i_b = 0;
- UV i_r = 0;
-
- /* running count, as explained in the algorithm source book; items are
- * stopped accumulating and are output when the count changes to/from 2.
- * The count is incremented when we start a range that's in the set, and
- * decremented when we start a range that's not in the set. So its range
- * is 0 to 2. Only when the count is 2 is something in the intersection.
- */
- UV count = 0;
-
- PERL_ARGS_ASSERT__INVLIST_INTERSECTION_MAYBE_COMPLEMENT_2ND;
- assert(a != b);
-
- /* Special case if either one is empty */
- len_a = (a == NULL) ? 0 : _invlist_len(a);
- if ((len_a == 0) || ((len_b = _invlist_len(b)) == 0)) {
- bool make_temp = FALSE;
-
- if (len_a != 0 && complement_b) {
-
- /* Here, 'a' is not empty, therefore from the above 'if', 'b' must
- * be empty. Here, also we are using 'b's complement, which hence
- * must be every possible code point. Thus the intersection is
- * simply 'a'. */
- if (*i != a) {
- if (*i == b) {
- if (! (make_temp = cBOOL(SvTEMP(b)))) {
- SvREFCNT_dec_NN(b);
- }
- }
-
- *i = invlist_clone(a);
- }
- /* else *i is already 'a' */
-
- if (make_temp) {
- sv_2mortal(*i);
- }
- return;
- }
-
- /* Here, 'a' or 'b' is empty and not using the complement of 'b'. The
- * intersection must be empty */
- if (*i == a) {
- if (! (make_temp = cBOOL(SvTEMP(a)))) {
- SvREFCNT_dec_NN(a);
- }
- }
- else if (*i == b) {
- if (! (make_temp = cBOOL(SvTEMP(b)))) {
- SvREFCNT_dec_NN(b);
- }
- }
- *i = _new_invlist(0);
- if (make_temp) {
- sv_2mortal(*i);
- }
-
- return;
- }
-
- /* Here both lists exist and are non-empty */
- array_a = invlist_array(a);
- array_b = invlist_array(b);
-
- /* If are to take the intersection of 'a' with the complement of b, set it
- * up so are looking at b's complement. */
- if (complement_b) {
-
- /* To complement, we invert: if the first element is 0, remove it. To
- * do this, we just pretend the array starts one later */
- if (array_b[0] == 0) {
- array_b++;
- len_b--;
- }
- else {
-
- /* But if the first element is not zero, we pretend the list starts
- * at the 0 that is always stored immediately before the array. */
- array_b--;
- len_b++;
- }
- }
-
- /* Size the intersection for the worst case: that the intersection ends up
- * fragmenting everything to be completely disjoint */
- r= _new_invlist(len_a + len_b);
-
- /* Will contain U+0000 iff both components do */
- array_r = _invlist_array_init(r, len_a > 0 && array_a[0] == 0
- && len_b > 0 && array_b[0] == 0);
-
- /* Go through each list item by item, stopping when exhausted one of
- * them */
- while (i_a < len_a && i_b < len_b) {
- UV cp; /* The element to potentially add to the intersection's
- array */
- bool cp_in_set; /* Is it in the input list's set or not */
-
- /* We need to take one or the other of the two inputs for the
- * intersection. Since we are merging two sorted lists, we take the
- * smaller of the next items. In case of a tie, we take the one that
- * is not in its set first (a difference from the union algorithm). If
- * we took one in the set first, it would increment the count, possibly
- * to 2 which would cause it to be output as starting a range in the
- * intersection, and the next time through we would take that same
- * number, and output it again as ending the set. By doing it the
- * opposite of this, there is no possibility that the count will be
- * momentarily incremented to 2. (In a tie and both are in the set or
- * both not in the set, it doesn't matter which we take first.) */
- if (array_a[i_a] < array_b[i_b]
- || (array_a[i_a] == array_b[i_b]
- && ! ELEMENT_RANGE_MATCHES_INVLIST(i_a)))
- {
- cp_in_set = ELEMENT_RANGE_MATCHES_INVLIST(i_a);
- cp= array_a[i_a++];
- }
- else {
- cp_in_set = ELEMENT_RANGE_MATCHES_INVLIST(i_b);
- cp= array_b[i_b++];
- }
-
- /* Here, have chosen which of the two inputs to look at. Only output
- * if the running count changes to/from 2, which marks the
- * beginning/end of a range that's in the intersection */
- if (cp_in_set) {
- count++;
- if (count == 2) {
- array_r[i_r++] = cp;
- }
- }
- else {
- if (count == 2) {
- array_r[i_r++] = cp;
- }
- count--;
- }
- }
-
- /* Here, we are finished going through at least one of the lists, which
- * means there is something remaining in at most one. We check if the list
- * that has been exhausted is positioned such that we are in the middle
- * of a range in its set or not. (i_a and i_b point to elements 1 beyond
- * the ones we care about.) There are four cases:
- * 1) Both weren't in their sets, count is 0, and remains 0. There's
- * nothing left in the intersection.
- * 2) Both were in their sets, count is 2 and perhaps is incremented to
- * above 2. What should be output is exactly that which is in the
- * non-exhausted set, as everything it has is also in the intersection
- * set, and everything it doesn't have can't be in the intersection
- * 3) The exhausted was in its set, non-exhausted isn't, count is 1, and
- * gets incremented to 2. Like the previous case, the intersection is
- * everything that remains in the non-exhausted set.
- * 4) the exhausted wasn't in its set, non-exhausted is, count is 1, and
- * remains 1. And the intersection has nothing more. */
- if ((i_a == len_a && PREV_RANGE_MATCHES_INVLIST(i_a))
- || (i_b == len_b && PREV_RANGE_MATCHES_INVLIST(i_b)))
- {
- count++;
- }
-
- /* The final length is what we've output so far plus what else is in the
- * intersection. At most one of the subexpressions below will be non-zero
- * */
- len_r = i_r;
- if (count >= 2) {
- len_r += (len_a - i_a) + (len_b - i_b);
- }
-
- /* Set result to final length, which can change the pointer to array_r, so
- * re-find it */
- if (len_r != _invlist_len(r)) {
- invlist_set_len(r, len_r, *get_invlist_offset_addr(r));
- invlist_trim(r);
- array_r = invlist_array(r);
- }
-
- /* Finish outputting any remaining */
- if (count >= 2) { /* At most one will have a non-zero copy count */
- IV copy_count;
- if ((copy_count = len_a - i_a) > 0) {
- Copy(array_a + i_a, array_r + i_r, copy_count, UV);
- }
- else if ((copy_count = len_b - i_b) > 0) {
- Copy(array_b + i_b, array_r + i_r, copy_count, UV);
- }
- }
-
- /* We may be removing a reference to one of the inputs. If so, the output
- * is made mortal if the input was. (Mortal SVs shouldn't have their ref
- * count decremented) */
- if (a == *i || b == *i) {
- assert(! invlist_is_iterating(*i));
- if (SvTEMP(*i)) {
- sv_2mortal(r);
- }
- else {
- SvREFCNT_dec_NN(*i);
- }
- }
-
- *i = r;
-
- return;
-}
-
-SV*
-Perl__add_range_to_invlist(pTHX_ SV* invlist, const UV start, const UV end)
-{
- /* Add the range from 'start' to 'end' inclusive to the inversion list's
- * set. A pointer to the inversion list is returned. This may actually be
- * a new list, in which case the passed in one has been destroyed. The
- * passed in inversion list can be NULL, in which case a new one is created
- * with just the one range in it */
-
- SV* range_invlist;
- UV len;
-
- if (invlist == NULL) {
- invlist = _new_invlist(2);
- len = 0;
- }
- else {
- len = _invlist_len(invlist);
- }
-
- /* If comes after the final entry actually in the list, can just append it
- * to the end, */
- if (len == 0
- || (! ELEMENT_RANGE_MATCHES_INVLIST(len - 1)
- && start >= invlist_array(invlist)[len - 1]))
- {
- _append_range_to_invlist(invlist, start, end);
- return invlist;
- }
-
- /* Here, can't just append things, create and return a new inversion list
- * which is the union of this range and the existing inversion list */
- range_invlist = _new_invlist(2);
- _append_range_to_invlist(range_invlist, start, end);
-
- _invlist_union(invlist, range_invlist, &invlist);
-
- /* The temporary can be freed */
- SvREFCNT_dec_NN(range_invlist);
-
- return invlist;
-}
-
-SV*
-Perl__setup_canned_invlist(pTHX_ const STRLEN size, const UV element0,
- UV** other_elements_ptr)
-{
- /* Create and return an inversion list whose contents are to be populated
- * by the caller. The caller gives the number of elements (in 'size') and
- * the very first element ('element0'). This function will set
- * '*other_elements_ptr' to an array of UVs, where the remaining elements
- * are to be placed.
- *
- * Obviously there is some trust involved that the caller will properly
- * fill in the other elements of the array.
- *
- * (The first element needs to be passed in, as the underlying code does
- * things differently depending on whether it is zero or non-zero) */
-
- SV* invlist = _new_invlist(size);
- bool offset;
-
- PERL_ARGS_ASSERT__SETUP_CANNED_INVLIST;
-
- _append_range_to_invlist(invlist, element0, element0);
- offset = *get_invlist_offset_addr(invlist);
-
- invlist_set_len(invlist, size, offset);
- *other_elements_ptr = invlist_array(invlist) + 1;
- return invlist;
-}
-
-#endif
-
-PERL_STATIC_INLINE SV*
-S_add_cp_to_invlist(pTHX_ SV* invlist, const UV cp) {
- return _add_range_to_invlist(invlist, cp, cp);
-}
-
-#ifndef PERL_IN_XSUB_RE
-void
-Perl__invlist_invert(pTHX_ SV* const invlist)
-{
- /* Complement the input inversion list. This adds a 0 if the list didn't
- * have a zero; removes it otherwise. As described above, the data
- * structure is set up so that this is very efficient */
-
- PERL_ARGS_ASSERT__INVLIST_INVERT;
-
- assert(! invlist_is_iterating(invlist));
-
- /* The inverse of matching nothing is matching everything */
- if (_invlist_len(invlist) == 0) {
- _append_range_to_invlist(invlist, 0, UV_MAX);
- return;
- }
-
- *get_invlist_offset_addr(invlist) = ! *get_invlist_offset_addr(invlist);
-}
-
-#endif
-
-PERL_STATIC_INLINE SV*
-S_invlist_clone(pTHX_ SV* const invlist)
-{
-
- /* Return a new inversion list that is a copy of the input one, which is
- * unchanged. The new list will not be mortal even if the old one was. */
-
- /* Need to allocate extra space to accommodate Perl's addition of a
- * trailing NUL to SvPV's, since it thinks they are always strings */
- SV* new_invlist = _new_invlist(_invlist_len(invlist) + 1);
- STRLEN physical_length = SvCUR(invlist);
- bool offset = *(get_invlist_offset_addr(invlist));
-
- PERL_ARGS_ASSERT_INVLIST_CLONE;
-
- *(get_invlist_offset_addr(new_invlist)) = offset;
- invlist_set_len(new_invlist, _invlist_len(invlist), offset);
- Copy(SvPVX(invlist), SvPVX(new_invlist), physical_length, char);
-
- return new_invlist;
-}
-
-PERL_STATIC_INLINE STRLEN*
-S_get_invlist_iter_addr(SV* invlist)
-{
- /* Return the address of the UV that contains the current iteration
- * position */
-
- PERL_ARGS_ASSERT_GET_INVLIST_ITER_ADDR;
-
- assert(SvTYPE(invlist) == SVt_INVLIST);
-
- return &(((XINVLIST*) SvANY(invlist))->iterator);
-}
-
-PERL_STATIC_INLINE void
-S_invlist_iterinit(SV* invlist) /* Initialize iterator for invlist */
-{
- PERL_ARGS_ASSERT_INVLIST_ITERINIT;
-
- *get_invlist_iter_addr(invlist) = 0;
-}
-
-PERL_STATIC_INLINE void
-S_invlist_iterfinish(SV* invlist)
-{
- /* Terminate iterator for invlist. This is to catch development errors.
- * Any iteration that is interrupted before completed should call this
- * function. Functions that add code points anywhere else but to the end
- * of an inversion list assert that they are not in the middle of an
- * iteration. If they were, the addition would make the iteration
- * problematical: if the iteration hadn't reached the place where things
- * were being added, it would be ok */
-
- PERL_ARGS_ASSERT_INVLIST_ITERFINISH;
-
- *get_invlist_iter_addr(invlist) = (STRLEN) UV_MAX;
-}
-
-STATIC bool
-S_invlist_iternext(SV* invlist, UV* start, UV* end)
-{
- /* An C<invlist_iterinit> call on <invlist> must be used to set this up.
- * This call sets in <*start> and <*end>, the next range in <invlist>.
- * Returns <TRUE> if successful and the next call will return the next
- * range; <FALSE> if was already at the end of the list. If the latter,
- * <*start> and <*end> are unchanged, and the next call to this function
- * will start over at the beginning of the list */
-
- STRLEN* pos = get_invlist_iter_addr(invlist);
- UV len = _invlist_len(invlist);
- UV *array;
-
- PERL_ARGS_ASSERT_INVLIST_ITERNEXT;
-
- if (*pos >= len) {
- *pos = (STRLEN) UV_MAX; /* Force iterinit() to be required next time */
- return FALSE;
- }
-
- array = invlist_array(invlist);
-
- *start = array[(*pos)++];
-
- if (*pos >= len) {
- *end = UV_MAX;
- }
- else {
- *end = array[(*pos)++] - 1;
- }
-
- return TRUE;
-}
-
-PERL_STATIC_INLINE bool
-S_invlist_is_iterating(SV* const invlist)
-{
- PERL_ARGS_ASSERT_INVLIST_IS_ITERATING;
-
- return *(get_invlist_iter_addr(invlist)) < (STRLEN) UV_MAX;
-}
-
-PERL_STATIC_INLINE UV
-S_invlist_highest(SV* const invlist)
-{
- /* Returns the highest code point that matches an inversion list. This API
- * has an ambiguity, as it returns 0 under either the highest is actually
- * 0, or if the list is empty. If this distinction matters to you, check
- * for emptiness before calling this function */
-
- UV len = _invlist_len(invlist);
- UV *array;
-
- PERL_ARGS_ASSERT_INVLIST_HIGHEST;
-
- if (len == 0) {
- return 0;
- }
-
- array = invlist_array(invlist);
-
- /* The last element in the array in the inversion list always starts a
- * range that goes to infinity. That range may be for code points that are
- * matched in the inversion list, or it may be for ones that aren't
- * matched. In the latter case, the highest code point in the set is one
- * less than the beginning of this range; otherwise it is the final element
- * of this range: infinity */
- return (ELEMENT_RANGE_MATCHES_INVLIST(len - 1))
- ? UV_MAX
- : array[len - 1] - 1;
-}
-
-#ifndef PERL_IN_XSUB_RE
-SV *
-Perl__invlist_contents(pTHX_ SV* const invlist)
-{
- /* Get the contents of an inversion list into a string SV so that they can
- * be printed out. It uses the format traditionally done for debug tracing
- */
-
- UV start, end;
- SV* output = newSVpvs("\n");
-
- PERL_ARGS_ASSERT__INVLIST_CONTENTS;
-
- assert(! invlist_is_iterating(invlist));
-
- invlist_iterinit(invlist);
- while (invlist_iternext(invlist, &start, &end)) {
- if (end == UV_MAX) {
- Perl_sv_catpvf(aTHX_ output, "%04"UVXf"\tINFINITY\n", start);
- }
- else if (end != start) {
- Perl_sv_catpvf(aTHX_ output, "%04"UVXf"\t%04"UVXf"\n",
- start, end);
- }
- else {
- Perl_sv_catpvf(aTHX_ output, "%04"UVXf"\n", start);
- }
- }
-
- return output;
-}
-#endif
-
-#ifndef PERL_IN_XSUB_RE
-void
-Perl__invlist_dump(pTHX_ PerlIO *file, I32 level,
- const char * const indent, SV* const invlist)
-{
- /* Designed to be called only by do_sv_dump(). Dumps out the ranges of the
- * inversion list 'invlist' to 'file' at 'level' Each line is prefixed by
- * the string 'indent'. The output looks like this:
- [0] 0x000A .. 0x000D
- [2] 0x0085
- [4] 0x2028 .. 0x2029
- [6] 0x3104 .. INFINITY
- * This means that the first range of code points matched by the list are
- * 0xA through 0xD; the second range contains only the single code point
- * 0x85, etc. An inversion list is an array of UVs. Two array elements
- * are used to define each range (except if the final range extends to
- * infinity, only a single element is needed). The array index of the
- * first element for the corresponding range is given in brackets. */
-
- UV start, end;
- STRLEN count = 0;
-
- PERL_ARGS_ASSERT__INVLIST_DUMP;
-
- if (invlist_is_iterating(invlist)) {
- Perl_dump_indent(aTHX_ level, file,
- "%sCan't dump inversion list because is in middle of iterating\n",
- indent);
- return;
- }
-
- invlist_iterinit(invlist);
- while (invlist_iternext(invlist, &start, &end)) {
- if (end == UV_MAX) {
- Perl_dump_indent(aTHX_ level, file,
- "%s[%"UVuf"] 0x%04"UVXf" .. INFINITY\n",
- indent, (UV)count, start);
- }
- else if (end != start) {
- Perl_dump_indent(aTHX_ level, file,
- "%s[%"UVuf"] 0x%04"UVXf" .. 0x%04"UVXf"\n",
- indent, (UV)count, start, end);
- }
- else {
- Perl_dump_indent(aTHX_ level, file, "%s[%"UVuf"] 0x%04"UVXf"\n",
- indent, (UV)count, start);
- }
- count += 2;
- }
-}
-
-void
-Perl__load_PL_utf8_foldclosures (pTHX)
-{
- assert(! PL_utf8_foldclosures);
-
- /* If the folds haven't been read in, call a fold function
- * to force that */
- if (! PL_utf8_tofold) {
- U8 dummy[UTF8_MAXBYTES_CASE+1];
-
- /* This string is just a short named one above \xff */
- to_utf8_fold((U8*) HYPHEN_UTF8, dummy, NULL);
- assert(PL_utf8_tofold); /* Verify that worked */
- }
- PL_utf8_foldclosures = _swash_inversion_hash(PL_utf8_tofold);
-}
-#endif
-
-#ifdef PERL_ARGS_ASSERT__INVLISTEQ
-bool
-S__invlistEQ(pTHX_ SV* const a, SV* const b, const bool complement_b)
-{
- /* Return a boolean as to if the two passed in inversion lists are
- * identical. The final argument, if TRUE, says to take the complement of
- * the second inversion list before doing the comparison */
-
- const UV* array_a = invlist_array(a);
- const UV* array_b = invlist_array(b);
- UV len_a = _invlist_len(a);
- UV len_b = _invlist_len(b);
-
- UV i = 0; /* current index into the arrays */
- bool retval = TRUE; /* Assume are identical until proven otherwise */
-
- PERL_ARGS_ASSERT__INVLISTEQ;
-
- /* If are to compare 'a' with the complement of b, set it
- * up so are looking at b's complement. */
- if (complement_b) {
-
- /* The complement of nothing is everything, so <a> would have to have
- * just one element, starting at zero (ending at infinity) */
- if (len_b == 0) {
- return (len_a == 1 && array_a[0] == 0);
- }
- else if (array_b[0] == 0) {
-
- /* Otherwise, to complement, we invert. Here, the first element is
- * 0, just remove it. To do this, we just pretend the array starts
- * one later */
-
- array_b++;
- len_b--;
- }
- else {
-
- /* But if the first element is not zero, we pretend the list starts
- * at the 0 that is always stored immediately before the array. */
- array_b--;
- len_b++;
- }
- }
-
- /* Make sure that the lengths are the same, as well as the final element
- * before looping through the remainder. (Thus we test the length, final,
- * and first elements right off the bat) */
- if (len_a != len_b || array_a[len_a-1] != array_b[len_a-1]) {
- retval = FALSE;
- }
- else for (i = 0; i < len_a - 1; i++) {
- if (array_a[i] != array_b[i]) {
- retval = FALSE;
- break;
- }
- }
-
- return retval;
-}
-#endif
-
-#undef HEADER_LENGTH
-#undef TO_INTERNAL_SIZE
-#undef FROM_INTERNAL_SIZE
-#undef INVLIST_VERSION_ID
-
-/* End of inversion list object */
-
-STATIC void
-S_parse_lparen_question_flags(pTHX_ RExC_state_t *pRExC_state)
-{
- /* This parses the flags that are in either the '(?foo)' or '(?foo:bar)'
- * constructs, and updates RExC_flags with them. On input, RExC_parse
- * should point to the first flag; it is updated on output to point to the
- * final ')' or ':'. There needs to be at least one flag, or this will
- * abort */
-
- /* for (?g), (?gc), and (?o) warnings; warning
- about (?c) will warn about (?g) -- japhy */
-
-#define WASTED_O 0x01
-#define WASTED_G 0x02
-#define WASTED_C 0x04
-#define WASTED_GC (WASTED_G|WASTED_C)
- I32 wastedflags = 0x00;
- U32 posflags = 0, negflags = 0;
- U32 *flagsp = &posflags;
- char has_charset_modifier = '\0';
- regex_charset cs;
- bool has_use_defaults = FALSE;
- const char* const seqstart = RExC_parse - 1; /* Point to the '?' */
-
- PERL_ARGS_ASSERT_PARSE_LPAREN_QUESTION_FLAGS;
-
- /* '^' as an initial flag sets certain defaults */
- if (UCHARAT(RExC_parse) == '^') {
- RExC_parse++;
- has_use_defaults = TRUE;
- STD_PMMOD_FLAGS_CLEAR(&RExC_flags);
- set_regex_charset(&RExC_flags, (RExC_utf8 || RExC_uni_semantics)
- ? REGEX_UNICODE_CHARSET
- : REGEX_DEPENDS_CHARSET);
- }
-
- cs = get_regex_charset(RExC_flags);
- if (cs == REGEX_DEPENDS_CHARSET
- && (RExC_utf8 || RExC_uni_semantics))
- {
- cs = REGEX_UNICODE_CHARSET;
- }
-
- while (*RExC_parse) {
- /* && strchr("iogcmsx", *RExC_parse) */
- /* (?g), (?gc) and (?o) are useless here
- and must be globally applied -- japhy */
- switch (*RExC_parse) {
-
- /* Code for the imsx flags */
- CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp);
-
- case LOCALE_PAT_MOD:
- if (has_charset_modifier) {
- goto excess_modifier;
- }
- else if (flagsp == &negflags) {
- goto neg_modifier;
- }
- cs = REGEX_LOCALE_CHARSET;
- has_charset_modifier = LOCALE_PAT_MOD;
- break;
- case UNICODE_PAT_MOD:
- if (has_charset_modifier) {
- goto excess_modifier;
- }
- else if (flagsp == &negflags) {
- goto neg_modifier;
- }
- cs = REGEX_UNICODE_CHARSET;
- has_charset_modifier = UNICODE_PAT_MOD;
- break;
- case ASCII_RESTRICT_PAT_MOD:
- if (flagsp == &negflags) {
- goto neg_modifier;
- }
- if (has_charset_modifier) {
- if (cs != REGEX_ASCII_RESTRICTED_CHARSET) {
- goto excess_modifier;
- }
- /* Doubled modifier implies more restricted */
- cs = REGEX_ASCII_MORE_RESTRICTED_CHARSET;
- }
- else {
- cs = REGEX_ASCII_RESTRICTED_CHARSET;
- }
- has_charset_modifier = ASCII_RESTRICT_PAT_MOD;
- break;
- case DEPENDS_PAT_MOD:
- if (has_use_defaults) {
- goto fail_modifiers;
- }
- else if (flagsp == &negflags) {
- goto neg_modifier;
- }
- else if (has_charset_modifier) {
- goto excess_modifier;
- }
-
- /* The dual charset means unicode semantics if the
- * pattern (or target, not known until runtime) are
- * utf8, or something in the pattern indicates unicode
- * semantics */
- cs = (RExC_utf8 || RExC_uni_semantics)
- ? REGEX_UNICODE_CHARSET
- : REGEX_DEPENDS_CHARSET;
- has_charset_modifier = DEPENDS_PAT_MOD;
- break;
- excess_modifier:
- RExC_parse++;
- if (has_charset_modifier == ASCII_RESTRICT_PAT_MOD) {
- vFAIL2("Regexp modifier \"%c\" may appear a maximum of twice", ASCII_RESTRICT_PAT_MOD);
- }
- else if (has_charset_modifier == *(RExC_parse - 1)) {
- vFAIL2("Regexp modifier \"%c\" may not appear twice",
- *(RExC_parse - 1));
- }
- else {
- vFAIL3("Regexp modifiers \"%c\" and \"%c\" are mutually exclusive", has_charset_modifier, *(RExC_parse - 1));
- }
- /*NOTREACHED*/
- neg_modifier:
- RExC_parse++;
- vFAIL2("Regexp modifier \"%c\" may not appear after the \"-\"",
- *(RExC_parse - 1));
- /*NOTREACHED*/
- case ONCE_PAT_MOD: /* 'o' */
- case GLOBAL_PAT_MOD: /* 'g' */
- if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
- const I32 wflagbit = *RExC_parse == 'o'
- ? WASTED_O
- : WASTED_G;
- if (! (wastedflags & wflagbit) ) {
- wastedflags |= wflagbit;
- /* diag_listed_as: Useless (?-%s) - don't use /%s modifier in regex; marked by <-- HERE in m/%s/ */
- vWARN5(
- RExC_parse + 1,
- "Useless (%s%c) - %suse /%c modifier",
- flagsp == &negflags ? "?-" : "?",
- *RExC_parse,
- flagsp == &negflags ? "don't " : "",
- *RExC_parse
- );
- }
- }
- break;
-
- case CONTINUE_PAT_MOD: /* 'c' */
- if (SIZE_ONLY && ckWARN(WARN_REGEXP)) {
- if (! (wastedflags & WASTED_C) ) {
- wastedflags |= WASTED_GC;
- /* diag_listed_as: Useless (?-%s) - don't use /%s modifier in regex; marked by <-- HERE in m/%s/ */
- vWARN3(
- RExC_parse + 1,
- "Useless (%sc) - %suse /gc modifier",
- flagsp == &negflags ? "?-" : "?",
- flagsp == &negflags ? "don't " : ""
- );
- }
- }
- break;
- case KEEPCOPY_PAT_MOD: /* 'p' */
- if (flagsp == &negflags) {
- if (SIZE_ONLY)
- ckWARNreg(RExC_parse + 1,"Useless use of (?-p)");
- } else {
- *flagsp |= RXf_PMf_KEEPCOPY;
- }
- break;
- case '-':
- /* A flag is a default iff it is following a minus, so
- * if there is a minus, it means will be trying to
- * re-specify a default which is an error */
- if (has_use_defaults || flagsp == &negflags) {
- goto fail_modifiers;
- }
- flagsp = &negflags;
- wastedflags = 0; /* reset so (?g-c) warns twice */
- break;
- case ':':
- case ')':
- RExC_flags |= posflags;
- RExC_flags &= ~negflags;
- set_regex_charset(&RExC_flags, cs);
- if (RExC_flags & RXf_PMf_FOLD) {
- RExC_contains_i = 1;
- }
- return;
- /*NOTREACHED*/
- default:
- fail_modifiers:
- RExC_parse += UTF ? UTF8SKIP(RExC_parse) : 1;
- /* diag_listed_as: Sequence (?%s...) not recognized in regex; marked by <-- HERE in m/%s/ */
- vFAIL2utf8f("Sequence (%"UTF8f"...) not recognized",
- UTF8fARG(UTF, RExC_parse-seqstart, seqstart));
- /*NOTREACHED*/
- }
-
- ++RExC_parse;
- }
-}
-
-/*
- - reg - regular expression, i.e. main body or parenthesized thing
- *
- * Caller must absorb opening parenthesis.
- *
- * Combining parenthesis handling with the base level of regular expression
- * is a trifle forced, but the need to tie the tails of the branches to what
- * follows makes it hard to avoid.
- */
-#define REGTAIL(x,y,z) regtail((x),(y),(z),depth+1)
-#ifdef DEBUGGING
-#define REGTAIL_STUDY(x,y,z) regtail_study((x),(y),(z),depth+1)
-#else
-#define REGTAIL_STUDY(x,y,z) regtail((x),(y),(z),depth+1)
-#endif
-
-/* Returns NULL, setting *flagp to TRYAGAIN at the end of (?) that only sets
- flags. Returns NULL, setting *flagp to RESTART_UTF8 if the sizing scan
- needs to be restarted.
- Otherwise would only return NULL if regbranch() returns NULL, which
- cannot happen. */
-STATIC regnode *
-S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp,U32 depth)
- /* paren: Parenthesized? 0=top; 1,2=inside '(': changed to letter.
- * 2 is like 1, but indicates that nextchar() has been called to advance
- * RExC_parse beyond the '('. Things like '(?' are indivisible tokens, and
- * this flag alerts us to the need to check for that */
-{
- regnode *ret; /* Will be the head of the group. */
- regnode *br;
- regnode *lastbr;
- regnode *ender = NULL;
- I32 parno = 0;
- I32 flags;
- U32 oregflags = RExC_flags;
- bool have_branch = 0;
- bool is_open = 0;
- I32 freeze_paren = 0;
- I32 after_freeze = 0;
- I32 num; /* numeric backreferences */
-
- char * parse_start = RExC_parse; /* MJD */
- char * const oregcomp_parse = RExC_parse;
-
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REG;
- DEBUG_PARSE("reg ");
-
- *flagp = 0; /* Tentatively. */
-
-
- /* Make an OPEN node, if parenthesized. */
- if (paren) {
-
- /* Under /x, space and comments can be gobbled up between the '(' and
- * here (if paren ==2). The forms '(*VERB' and '(?...' disallow such
- * intervening space, as the sequence is a token, and a token should be
- * indivisible */
- bool has_intervening_patws = paren == 2 && *(RExC_parse - 1) != '(';
-
- if ( *RExC_parse == '*') { /* (*VERB:ARG) */
- char *start_verb = RExC_parse;
- STRLEN verb_len = 0;
- char *start_arg = NULL;
- unsigned char op = 0;
- int argok = 1;
- int internal_argval = 0; /* internal_argval is only useful if
- !argok */
-
- if (has_intervening_patws) {
- RExC_parse++;
- vFAIL("In '(*VERB...)', the '(' and '*' must be adjacent");
- }
- while ( *RExC_parse && *RExC_parse != ')' ) {
- if ( *RExC_parse == ':' ) {
- start_arg = RExC_parse + 1;
- break;
- }
- RExC_parse++;
- }
- ++start_verb;
- verb_len = RExC_parse - start_verb;
- if ( start_arg ) {
- RExC_parse++;
- while ( *RExC_parse && *RExC_parse != ')' )
- RExC_parse++;
- if ( *RExC_parse != ')' )
- vFAIL("Unterminated verb pattern argument");
- if ( RExC_parse == start_arg )
- start_arg = NULL;
- } else {
- if ( *RExC_parse != ')' )
- vFAIL("Unterminated verb pattern");
- }
-
- switch ( *start_verb ) {
- case 'A': /* (*ACCEPT) */
- if ( memEQs(start_verb,verb_len,"ACCEPT") ) {
- op = ACCEPT;
- internal_argval = RExC_nestroot;
- }
- break;
- case 'C': /* (*COMMIT) */
- if ( memEQs(start_verb,verb_len,"COMMIT") )
- op = COMMIT;
- break;
- case 'F': /* (*FAIL) */
- if ( verb_len==1 || memEQs(start_verb,verb_len,"FAIL") ) {
- op = OPFAIL;
- argok = 0;
- }
- break;
- case ':': /* (*:NAME) */
- case 'M': /* (*MARK:NAME) */
- if ( verb_len==0 || memEQs(start_verb,verb_len,"MARK") ) {
- op = MARKPOINT;
- argok = -1;
- }
- break;
- case 'P': /* (*PRUNE) */
- if ( memEQs(start_verb,verb_len,"PRUNE") )
- op = PRUNE;
- break;
- case 'S': /* (*SKIP) */
- if ( memEQs(start_verb,verb_len,"SKIP") )
- op = SKIP;
- break;
- case 'T': /* (*THEN) */
- /* [19:06] <TimToady> :: is then */
- if ( memEQs(start_verb,verb_len,"THEN") ) {
- op = CUTGROUP;
- RExC_seen |= REG_CUTGROUP_SEEN;
- }
- break;
- }
- if ( ! op ) {
- RExC_parse += UTF ? UTF8SKIP(RExC_parse) : 1;
- vFAIL2utf8f(
- "Unknown verb pattern '%"UTF8f"'",
- UTF8fARG(UTF, verb_len, start_verb));
- }
- if ( argok ) {
- if ( start_arg && internal_argval ) {
- vFAIL3("Verb pattern '%.*s' may not have an argument",
- verb_len, start_verb);
- } else if ( argok < 0 && !start_arg ) {
- vFAIL3("Verb pattern '%.*s' has a mandatory argument",
- verb_len, start_verb);
- } else {
- ret = reganode(pRExC_state, op, internal_argval);
- if ( ! internal_argval && ! SIZE_ONLY ) {
- if (start_arg) {
- SV *sv = newSVpvn( start_arg,
- RExC_parse - start_arg);
- ARG(ret) = add_data( pRExC_state,
- STR_WITH_LEN("S"));
- RExC_rxi->data->data[ARG(ret)]=(void*)sv;
- ret->flags = 0;
- } else {
- ret->flags = 1;
- }
- }
- }
- if (!internal_argval)
- RExC_seen |= REG_VERBARG_SEEN;
- } else if ( start_arg ) {
- vFAIL3("Verb pattern '%.*s' may not have an argument",
- verb_len, start_verb);
- } else {
- ret = reg_node(pRExC_state, op);
- }
- nextchar(pRExC_state);
- return ret;
- }
- else if (*RExC_parse == '?') { /* (?...) */
- bool is_logical = 0;
- const char * const seqstart = RExC_parse;
- const char * endptr;
- if (has_intervening_patws) {
- RExC_parse++;
- vFAIL("In '(?...)', the '(' and '?' must be adjacent");
- }
-
- RExC_parse++;
- paren = *RExC_parse++;
- ret = NULL; /* For look-ahead/behind. */
- switch (paren) {
-
- case 'P': /* (?P...) variants for those used to PCRE/Python */
- paren = *RExC_parse++;
- if ( paren == '<') /* (?P<...>) named capture */
- goto named_capture;
- else if (paren == '>') { /* (?P>name) named recursion */
- goto named_recursion;
- }
- else if (paren == '=') { /* (?P=...) named backref */
- /* this pretty much dupes the code for \k<NAME> in
- * regatom(), if you change this make sure you change that
- * */
- char* name_start = RExC_parse;
- U32 num = 0;
- SV *sv_dat = reg_scan_name(pRExC_state,
- SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
- if (RExC_parse == name_start || *RExC_parse != ')')
- /* diag_listed_as: Sequence ?P=... not terminated in regex; marked by <-- HERE in m/%s/ */
- vFAIL2("Sequence %.3s... not terminated",parse_start);
-
- if (!SIZE_ONLY) {
- num = add_data( pRExC_state, STR_WITH_LEN("S"));
- RExC_rxi->data->data[num]=(void*)sv_dat;
- SvREFCNT_inc_simple_void(sv_dat);
- }
- RExC_sawback = 1;
- ret = reganode(pRExC_state,
- ((! FOLD)
- ? NREF
- : (ASCII_FOLD_RESTRICTED)
- ? NREFFA
- : (AT_LEAST_UNI_SEMANTICS)
- ? NREFFU
- : (LOC)
- ? NREFFL
- : NREFF),
- num);
- *flagp |= HASWIDTH;
-
- Set_Node_Offset(ret, parse_start+1);
- Set_Node_Cur_Length(ret, parse_start);
-
- nextchar(pRExC_state);
- return ret;
- }
- RExC_parse++;
- /* diag_listed_as: Sequence (?%s...) not recognized in regex; marked by <-- HERE in m/%s/ */
- vFAIL3("Sequence (%.*s...) not recognized",
- RExC_parse-seqstart, seqstart);
- /*NOTREACHED*/
- case '<': /* (?<...) */
- if (*RExC_parse == '!')
- paren = ',';
- else if (*RExC_parse != '=')
- named_capture:
- { /* (?<...>) */
- char *name_start;
- SV *svname;
- paren= '>';
- case '\'': /* (?'...') */
- name_start= RExC_parse;
- svname = reg_scan_name(pRExC_state,
- SIZE_ONLY /* reverse test from the others */
- ? REG_RSN_RETURN_NAME
- : REG_RSN_RETURN_NULL);
- if (RExC_parse == name_start || *RExC_parse != paren)
- vFAIL2("Sequence (?%c... not terminated",
- paren=='>' ? '<' : paren);
- if (SIZE_ONLY) {
- HE *he_str;
- SV *sv_dat = NULL;
- if (!svname) /* shouldn't happen */
- Perl_croak(aTHX_
- "panic: reg_scan_name returned NULL");
- if (!RExC_paren_names) {
- RExC_paren_names= newHV();
- sv_2mortal(MUTABLE_SV(RExC_paren_names));
-#ifdef DEBUGGING
- RExC_paren_name_list= newAV();
- sv_2mortal(MUTABLE_SV(RExC_paren_name_list));
-#endif
- }
- he_str = hv_fetch_ent( RExC_paren_names, svname, 1, 0 );
- if ( he_str )
- sv_dat = HeVAL(he_str);
- if ( ! sv_dat ) {
- /* croak baby croak */
- Perl_croak(aTHX_
- "panic: paren_name hash element allocation failed");
- } else if ( SvPOK(sv_dat) ) {
- /* (?|...) can mean we have dupes so scan to check
- its already been stored. Maybe a flag indicating
- we are inside such a construct would be useful,
- but the arrays are likely to be quite small, so
- for now we punt -- dmq */
- IV count = SvIV(sv_dat);
- I32 *pv = (I32*)SvPVX(sv_dat);
- IV i;
- for ( i = 0 ; i < count ; i++ ) {
- if ( pv[i] == RExC_npar ) {
- count = 0;
- break;
- }
- }
- if ( count ) {
- pv = (I32*)SvGROW(sv_dat,
- SvCUR(sv_dat) + sizeof(I32)+1);
- SvCUR_set(sv_dat, SvCUR(sv_dat) + sizeof(I32));
- pv[count] = RExC_npar;
- SvIV_set(sv_dat, SvIVX(sv_dat) + 1);
- }
- } else {
- (void)SvUPGRADE(sv_dat,SVt_PVNV);
- sv_setpvn(sv_dat, (char *)&(RExC_npar),
- sizeof(I32));
- SvIOK_on(sv_dat);
- SvIV_set(sv_dat, 1);
- }
-#ifdef DEBUGGING
- /* Yes this does cause a memory leak in debugging Perls
- * */
- if (!av_store(RExC_paren_name_list,
- RExC_npar, SvREFCNT_inc(svname)))
- SvREFCNT_dec_NN(svname);
-#endif
-
- /*sv_dump(sv_dat);*/
- }
- nextchar(pRExC_state);
- paren = 1;
- goto capturing_parens;
- }
- RExC_seen |= REG_LOOKBEHIND_SEEN;
- RExC_in_lookbehind++;
- RExC_parse++;
- /* FALLTHROUGH */
- case '=': /* (?=...) */
- RExC_seen_zerolen++;
- break;
- case '!': /* (?!...) */
- RExC_seen_zerolen++;
- if (*RExC_parse == ')') {
- ret=reg_node(pRExC_state, OPFAIL);
- nextchar(pRExC_state);
- return ret;
- }
- break;
- case '|': /* (?|...) */
- /* branch reset, behave like a (?:...) except that
- buffers in alternations share the same numbers */
- paren = ':';
- after_freeze = freeze_paren = RExC_npar;
- break;
- case ':': /* (?:...) */
- case '>': /* (?>...) */
- break;
- case '$': /* (?$...) */
- case '@': /* (?@...) */
- vFAIL2("Sequence (?%c...) not implemented", (int)paren);
- break;
- case '0' : /* (?0) */
- case 'R' : /* (?R) */
- if (*RExC_parse != ')')
- FAIL("Sequence (?R) not terminated");
- ret = reg_node(pRExC_state, GOSTART);
- RExC_seen |= REG_GOSTART_SEEN;
- *flagp |= POSTPONED;
- nextchar(pRExC_state);
- return ret;
- /*notreached*/
- /* named and numeric backreferences */
- case '&': /* (?&NAME) */
- parse_start = RExC_parse - 1;
- named_recursion:
- {
- SV *sv_dat = reg_scan_name(pRExC_state,
- SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
- num = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
- }
- if (RExC_parse == RExC_end || *RExC_parse != ')')
- vFAIL("Sequence (?&... not terminated");
- goto gen_recurse_regop;
- assert(0); /* NOT REACHED */
- case '+':
- if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
- RExC_parse++;
- vFAIL("Illegal pattern");
- }
- goto parse_recursion;
- /* NOT REACHED*/
- case '-': /* (?-1) */
- if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
- RExC_parse--; /* rewind to let it be handled later */
- goto parse_flags;
- }
- /* FALLTHROUGH */
- case '1': case '2': case '3': case '4': /* (?1) */
- case '5': case '6': case '7': case '8': case '9':
- RExC_parse--;
- parse_recursion:
- {
- bool is_neg = FALSE;
- parse_start = RExC_parse - 1; /* MJD */
- if (*RExC_parse == '-') {
- RExC_parse++;
- is_neg = TRUE;
- }
- num = grok_atou(RExC_parse, &endptr);
- if (endptr)
- RExC_parse = (char*)endptr;
- if (is_neg) {
- /* Some limit for num? */
- num = -num;
- }
- }
- if (*RExC_parse!=')')
- vFAIL("Expecting close bracket");
-
- gen_recurse_regop:
- if ( paren == '-' ) {
- /*
- Diagram of capture buffer numbering.
- Top line is the normal capture buffer numbers
- Bottom line is the negative indexing as from
- the X (the (?-2))
-
- + 1 2 3 4 5 X 6 7
- /(a(x)y)(a(b(c(?-2)d)e)f)(g(h))/
- - 5 4 3 2 1 X x x
-
- */
- num = RExC_npar + num;
- if (num < 1) {
- RExC_parse++;
- vFAIL("Reference to nonexistent group");
- }
- } else if ( paren == '+' ) {
- num = RExC_npar + num - 1;
- }
-
- ret = reganode(pRExC_state, GOSUB, num);
- if (!SIZE_ONLY) {
- if (num > (I32)RExC_rx->nparens) {
- RExC_parse++;
- vFAIL("Reference to nonexistent group");
- }
- ARG2L_SET( ret, RExC_recurse_count++);
- RExC_emit++;
- DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
- "Recurse #%"UVuf" to %"IVdf"\n",
- (UV)ARG(ret), (IV)ARG2L(ret)));
- } else {
- RExC_size++;
- }
- RExC_seen |= REG_RECURSE_SEEN;
- Set_Node_Length(ret, 1 + regarglen[OP(ret)]); /* MJD */
- Set_Node_Offset(ret, parse_start); /* MJD */
-
- *flagp |= POSTPONED;
- nextchar(pRExC_state);
- return ret;
-
- assert(0); /* NOT REACHED */
-
- case '?': /* (??...) */
- is_logical = 1;
- if (*RExC_parse != '{') {
- RExC_parse++;
- /* diag_listed_as: Sequence (?%s...) not recognized in regex; marked by <-- HERE in m/%s/ */
- vFAIL2utf8f(
- "Sequence (%"UTF8f"...) not recognized",
- UTF8fARG(UTF, RExC_parse-seqstart, seqstart));
- /*NOTREACHED*/
- }
- *flagp |= POSTPONED;
- paren = *RExC_parse++;
- /* FALLTHROUGH */
- case '{': /* (?{...}) */
- {
- U32 n = 0;
- struct reg_code_block *cb;
-
- RExC_seen_zerolen++;
-
- if ( !pRExC_state->num_code_blocks
- || pRExC_state->code_index >= pRExC_state->num_code_blocks
- || pRExC_state->code_blocks[pRExC_state->code_index].start
- != (STRLEN)((RExC_parse -3 - (is_logical ? 1 : 0))
- - RExC_start)
- ) {
- if (RExC_pm_flags & PMf_USE_RE_EVAL)
- FAIL("panic: Sequence (?{...}): no code block found\n");
- FAIL("Eval-group not allowed at runtime, use re 'eval'");
- }
- /* this is a pre-compiled code block (?{...}) */
- cb = &pRExC_state->code_blocks[pRExC_state->code_index];
- RExC_parse = RExC_start + cb->end;
- if (!SIZE_ONLY) {
- OP *o = cb->block;
- if (cb->src_regex) {
- n = add_data(pRExC_state, STR_WITH_LEN("rl"));
- RExC_rxi->data->data[n] =
- (void*)SvREFCNT_inc((SV*)cb->src_regex);
- RExC_rxi->data->data[n+1] = (void*)o;
- }
- else {
- n = add_data(pRExC_state,
- (RExC_pm_flags & PMf_HAS_CV) ? "L" : "l", 1);
- RExC_rxi->data->data[n] = (void*)o;
- }
- }
- pRExC_state->code_index++;
- nextchar(pRExC_state);
-
- if (is_logical) {
- regnode *eval;
- ret = reg_node(pRExC_state, LOGICAL);
- eval = reganode(pRExC_state, EVAL, n);
- if (!SIZE_ONLY) {
- ret->flags = 2;
- /* for later propagation into (??{}) return value */
- eval->flags = (U8) (RExC_flags & RXf_PMf_COMPILETIME);
- }
- REGTAIL(pRExC_state, ret, eval);
- /* deal with the length of this later - MJD */
- return ret;
- }
- ret = reganode(pRExC_state, EVAL, n);
- Set_Node_Length(ret, RExC_parse - parse_start + 1);
- Set_Node_Offset(ret, parse_start);
- return ret;
- }
- case '(': /* (?(?{...})...) and (?(?=...)...) */
- {
- int is_define= 0;
- if (RExC_parse[0] == '?') { /* (?(?...)) */
- if (RExC_parse[1] == '=' || RExC_parse[1] == '!'
- || RExC_parse[1] == '<'
- || RExC_parse[1] == '{') { /* Lookahead or eval. */
- I32 flag;
- regnode *tail;
-
- ret = reg_node(pRExC_state, LOGICAL);
- if (!SIZE_ONLY)
- ret->flags = 1;
-
- tail = reg(pRExC_state, 1, &flag, depth+1);
- if (flag & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return NULL;
- }
- REGTAIL(pRExC_state, ret, tail);
- goto insert_if;
- }
- /* Fall through to ‘Unknown switch condition’ at the
- end of the if/else chain. */
- }
- else if ( RExC_parse[0] == '<' /* (?(<NAME>)...) */
- || RExC_parse[0] == '\'' ) /* (?('NAME')...) */
- {
- char ch = RExC_parse[0] == '<' ? '>' : '\'';
- char *name_start= RExC_parse++;
- U32 num = 0;
- SV *sv_dat=reg_scan_name(pRExC_state,
- SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
- if (RExC_parse == name_start || *RExC_parse != ch)
- vFAIL2("Sequence (?(%c... not terminated",
- (ch == '>' ? '<' : ch));
- RExC_parse++;
- if (!SIZE_ONLY) {
- num = add_data( pRExC_state, STR_WITH_LEN("S"));
- RExC_rxi->data->data[num]=(void*)sv_dat;
- SvREFCNT_inc_simple_void(sv_dat);
- }
- ret = reganode(pRExC_state,NGROUPP,num);
- goto insert_if_check_paren;
- }
- else if (RExC_parse[0] == 'D' &&
- RExC_parse[1] == 'E' &&
- RExC_parse[2] == 'F' &&
- RExC_parse[3] == 'I' &&
- RExC_parse[4] == 'N' &&
- RExC_parse[5] == 'E')
- {
- ret = reganode(pRExC_state,DEFINEP,0);
- RExC_parse +=6 ;
- is_define = 1;
- goto insert_if_check_paren;
- }
- else if (RExC_parse[0] == 'R') {
- RExC_parse++;
- parno = 0;
- if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
- parno = grok_atou(RExC_parse, &endptr);
- if (endptr)
- RExC_parse = (char*)endptr;
- } else if (RExC_parse[0] == '&') {
- SV *sv_dat;
- RExC_parse++;
- sv_dat = reg_scan_name(pRExC_state,
- SIZE_ONLY
- ? REG_RSN_RETURN_NULL
- : REG_RSN_RETURN_DATA);
- parno = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
- }
- ret = reganode(pRExC_state,INSUBP,parno);
- goto insert_if_check_paren;
- }
- else if (RExC_parse[0] >= '1' && RExC_parse[0] <= '9' ) {
- /* (?(1)...) */
- char c;
- char *tmp;
- parno = grok_atou(RExC_parse, &endptr);
- if (endptr)
- RExC_parse = (char*)endptr;
- ret = reganode(pRExC_state, GROUPP, parno);
-
- insert_if_check_paren:
- if (*(tmp = nextchar(pRExC_state)) != ')') {
- /* nextchar also skips comments, so undo its work
- * and skip over the the next character.
- */
- RExC_parse = tmp;
- RExC_parse += UTF ? UTF8SKIP(RExC_parse) : 1;
- vFAIL("Switch condition not recognized");
- }
- insert_if:
- REGTAIL(pRExC_state, ret, reganode(pRExC_state, IFTHEN, 0));
- br = regbranch(pRExC_state, &flags, 1,depth+1);
- if (br == NULL) {
- if (flags & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return NULL;
- }
- FAIL2("panic: regbranch returned NULL, flags=%#"UVxf"",
- (UV) flags);
- } else
- REGTAIL(pRExC_state, br, reganode(pRExC_state,
- LONGJMP, 0));
- c = *nextchar(pRExC_state);
- if (flags&HASWIDTH)
- *flagp |= HASWIDTH;
- if (c == '|') {
- if (is_define)
- vFAIL("(?(DEFINE)....) does not allow branches");
-
- /* Fake one for optimizer. */
- lastbr = reganode(pRExC_state, IFTHEN, 0);
-
- if (!regbranch(pRExC_state, &flags, 1,depth+1)) {
- if (flags & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return NULL;
- }
- FAIL2("panic: regbranch returned NULL, flags=%#"UVxf"",
- (UV) flags);
- }
- REGTAIL(pRExC_state, ret, lastbr);
- if (flags&HASWIDTH)
- *flagp |= HASWIDTH;
- c = *nextchar(pRExC_state);
- }
- else
- lastbr = NULL;
- if (c != ')')
- vFAIL("Switch (?(condition)... contains too many branches");
- ender = reg_node(pRExC_state, TAIL);
- REGTAIL(pRExC_state, br, ender);
- if (lastbr) {
- REGTAIL(pRExC_state, lastbr, ender);
- REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender);
- }
- else
- REGTAIL(pRExC_state, ret, ender);
- RExC_size++; /* XXX WHY do we need this?!!
- For large programs it seems to be required
- but I can't figure out why. -- dmq*/
- return ret;
- }
- RExC_parse += UTF ? UTF8SKIP(RExC_parse) : 1;
- vFAIL("Unknown switch condition (?(...))");
- }
- case '[': /* (?[ ... ]) */
- return handle_regex_sets(pRExC_state, NULL, flagp, depth,
- oregcomp_parse);
- case 0:
- RExC_parse--; /* for vFAIL to print correctly */
- vFAIL("Sequence (? incomplete");
- break;
- default: /* e.g., (?i) */
- --RExC_parse;
- parse_flags:
- parse_lparen_question_flags(pRExC_state);
- if (UCHARAT(RExC_parse) != ':') {
- nextchar(pRExC_state);
- *flagp = TRYAGAIN;
- return NULL;
- }
- paren = ':';
- nextchar(pRExC_state);
- ret = NULL;
- goto parse_rest;
- } /* end switch */
- }
- else { /* (...) */
- capturing_parens:
- parno = RExC_npar;
- RExC_npar++;
-
- ret = reganode(pRExC_state, OPEN, parno);
- if (!SIZE_ONLY ){
- if (!RExC_nestroot)
- RExC_nestroot = parno;
- if (RExC_seen & REG_RECURSE_SEEN
- && !RExC_open_parens[parno-1])
- {
- DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
- "Setting open paren #%"IVdf" to %d\n",
- (IV)parno, REG_NODE_NUM(ret)));
- RExC_open_parens[parno-1]= ret;
- }
- }
- Set_Node_Length(ret, 1); /* MJD */
- Set_Node_Offset(ret, RExC_parse); /* MJD */
- is_open = 1;
- }
- }
- else /* ! paren */
- ret = NULL;
-
- parse_rest:
- /* Pick up the branches, linking them together. */
- parse_start = RExC_parse; /* MJD */
- br = regbranch(pRExC_state, &flags, 1,depth+1);
-
- /* branch_len = (paren != 0); */
-
- if (br == NULL) {
- if (flags & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return NULL;
- }
- FAIL2("panic: regbranch returned NULL, flags=%#"UVxf"", (UV) flags);
- }
- if (*RExC_parse == '|') {
- if (!SIZE_ONLY && RExC_extralen) {
- reginsert(pRExC_state, BRANCHJ, br, depth+1);
- }
- else { /* MJD */
- reginsert(pRExC_state, BRANCH, br, depth+1);
- Set_Node_Length(br, paren != 0);
- Set_Node_Offset_To_R(br-RExC_emit_start, parse_start-RExC_start);
- }
- have_branch = 1;
- if (SIZE_ONLY)
- RExC_extralen += 1; /* For BRANCHJ-BRANCH. */
- }
- else if (paren == ':') {
- *flagp |= flags&SIMPLE;
- }
- if (is_open) { /* Starts with OPEN. */
- REGTAIL(pRExC_state, ret, br); /* OPEN -> first. */
- }
- else if (paren != '?') /* Not Conditional */
- ret = br;
- *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
- lastbr = br;
- while (*RExC_parse == '|') {
- if (!SIZE_ONLY && RExC_extralen) {
- ender = reganode(pRExC_state, LONGJMP,0);
-
- /* Append to the previous. */
- REGTAIL(pRExC_state, NEXTOPER(NEXTOPER(lastbr)), ender);
- }
- if (SIZE_ONLY)
- RExC_extralen += 2; /* Account for LONGJMP. */
- nextchar(pRExC_state);
- if (freeze_paren) {
- if (RExC_npar > after_freeze)
- after_freeze = RExC_npar;
- RExC_npar = freeze_paren;
- }
- br = regbranch(pRExC_state, &flags, 0, depth+1);
-
- if (br == NULL) {
- if (flags & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return NULL;
- }
- FAIL2("panic: regbranch returned NULL, flags=%#"UVxf"", (UV) flags);
- }
- REGTAIL(pRExC_state, lastbr, br); /* BRANCH -> BRANCH. */
- lastbr = br;
- *flagp |= flags & (SPSTART | HASWIDTH | POSTPONED);
- }
-
- if (have_branch || paren != ':') {
- /* Make a closing node, and hook it on the end. */
- switch (paren) {
- case ':':
- ender = reg_node(pRExC_state, TAIL);
- break;
- case 1: case 2:
- ender = reganode(pRExC_state, CLOSE, parno);
- if (!SIZE_ONLY && RExC_seen & REG_RECURSE_SEEN) {
- DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
- "Setting close paren #%"IVdf" to %d\n",
- (IV)parno, REG_NODE_NUM(ender)));
- RExC_close_parens[parno-1]= ender;
- if (RExC_nestroot == parno)
- RExC_nestroot = 0;
- }
- Set_Node_Offset(ender,RExC_parse+1); /* MJD */
- Set_Node_Length(ender,1); /* MJD */
- break;
- case '<':
- case ',':
- case '=':
- case '!':
- *flagp &= ~HASWIDTH;
- /* FALLTHROUGH */
- case '>':
- ender = reg_node(pRExC_state, SUCCEED);
- break;
- case 0:
- ender = reg_node(pRExC_state, END);
- if (!SIZE_ONLY) {
- assert(!RExC_opend); /* there can only be one! */
- RExC_opend = ender;
- }
- break;
- }
- DEBUG_PARSE_r(if (!SIZE_ONLY) {
- SV * const mysv_val1=sv_newmortal();
- SV * const mysv_val2=sv_newmortal();
- DEBUG_PARSE_MSG("lsbr");
- regprop(RExC_rx, mysv_val1, lastbr, NULL);
- regprop(RExC_rx, mysv_val2, ender, NULL);
- PerlIO_printf(Perl_debug_log, "~ tying lastbr %s (%"IVdf") to ender %s (%"IVdf") offset %"IVdf"\n",
- SvPV_nolen_const(mysv_val1),
- (IV)REG_NODE_NUM(lastbr),
- SvPV_nolen_const(mysv_val2),
- (IV)REG_NODE_NUM(ender),
- (IV)(ender - lastbr)
- );
- });
- REGTAIL(pRExC_state, lastbr, ender);
-
- if (have_branch && !SIZE_ONLY) {
- char is_nothing= 1;
- if (depth==1)
- RExC_seen |= REG_TOP_LEVEL_BRANCHES_SEEN;
-
- /* Hook the tails of the branches to the closing node. */
- for (br = ret; br; br = regnext(br)) {
- const U8 op = PL_regkind[OP(br)];
- if (op == BRANCH) {
- REGTAIL_STUDY(pRExC_state, NEXTOPER(br), ender);
- if ( OP(NEXTOPER(br)) != NOTHING
- || regnext(NEXTOPER(br)) != ender)
- is_nothing= 0;
- }
- else if (op == BRANCHJ) {
- REGTAIL_STUDY(pRExC_state, NEXTOPER(NEXTOPER(br)), ender);
- /* for now we always disable this optimisation * /
- if ( OP(NEXTOPER(NEXTOPER(br))) != NOTHING
- || regnext(NEXTOPER(NEXTOPER(br))) != ender)
- */
- is_nothing= 0;
- }
- }
- if (is_nothing) {
- br= PL_regkind[OP(ret)] != BRANCH ? regnext(ret) : ret;
- DEBUG_PARSE_r(if (!SIZE_ONLY) {
- SV * const mysv_val1=sv_newmortal();
- SV * const mysv_val2=sv_newmortal();
- DEBUG_PARSE_MSG("NADA");
- regprop(RExC_rx, mysv_val1, ret, NULL);
- regprop(RExC_rx, mysv_val2, ender, NULL);
- PerlIO_printf(Perl_debug_log, "~ converting ret %s (%"IVdf") to ender %s (%"IVdf") offset %"IVdf"\n",
- SvPV_nolen_const(mysv_val1),
- (IV)REG_NODE_NUM(ret),
- SvPV_nolen_const(mysv_val2),
- (IV)REG_NODE_NUM(ender),
- (IV)(ender - ret)
- );
- });
- OP(br)= NOTHING;
- if (OP(ender) == TAIL) {
- NEXT_OFF(br)= 0;
- RExC_emit= br + 1;
- } else {
- regnode *opt;
- for ( opt= br + 1; opt < ender ; opt++ )
- OP(opt)= OPTIMIZED;
- NEXT_OFF(br)= ender - br;
- }
- }
- }
- }
-
- {
- const char *p;
- static const char parens[] = "=!<,>";
-
- if (paren && (p = strchr(parens, paren))) {
- U8 node = ((p - parens) % 2) ? UNLESSM : IFMATCH;
- int flag = (p - parens) > 1;
-
- if (paren == '>')
- node = SUSPEND, flag = 0;
- reginsert(pRExC_state, node,ret, depth+1);
- Set_Node_Cur_Length(ret, parse_start);
- Set_Node_Offset(ret, parse_start + 1);
- ret->flags = flag;
- REGTAIL_STUDY(pRExC_state, ret, reg_node(pRExC_state, TAIL));
- }
- }
-
- /* Check for proper termination. */
- if (paren) {
- /* restore original flags, but keep (?p) */
- RExC_flags = oregflags | (RExC_flags & RXf_PMf_KEEPCOPY);
- if (RExC_parse >= RExC_end || *nextchar(pRExC_state) != ')') {
- RExC_parse = oregcomp_parse;
- vFAIL("Unmatched (");
- }
- }
- else if (!paren && RExC_parse < RExC_end) {
- if (*RExC_parse == ')') {
- RExC_parse++;
- vFAIL("Unmatched )");
- }
- else
- FAIL("Junk on end of regexp"); /* "Can't happen". */
- assert(0); /* NOTREACHED */
- }
-
- if (RExC_in_lookbehind) {
- RExC_in_lookbehind--;
- }
- if (after_freeze > RExC_npar)
- RExC_npar = after_freeze;
- return(ret);
-}
-
-/*
- - regbranch - one alternative of an | operator
- *
- * Implements the concatenation operator.
- *
- * Returns NULL, setting *flagp to RESTART_UTF8 if the sizing scan needs to be
- * restarted.
- */
-STATIC regnode *
-S_regbranch(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, I32 first, U32 depth)
-{
- regnode *ret;
- regnode *chain = NULL;
- regnode *latest;
- I32 flags = 0, c = 0;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGBRANCH;
-
- DEBUG_PARSE("brnc");
-
- if (first)
- ret = NULL;
- else {
- if (!SIZE_ONLY && RExC_extralen)
- ret = reganode(pRExC_state, BRANCHJ,0);
- else {
- ret = reg_node(pRExC_state, BRANCH);
- Set_Node_Length(ret, 1);
- }
- }
-
- if (!first && SIZE_ONLY)
- RExC_extralen += 1; /* BRANCHJ */
-
- *flagp = WORST; /* Tentatively. */
-
- RExC_parse--;
- nextchar(pRExC_state);
- while (RExC_parse < RExC_end && *RExC_parse != '|' && *RExC_parse != ')') {
- flags &= ~TRYAGAIN;
- latest = regpiece(pRExC_state, &flags,depth+1);
- if (latest == NULL) {
- if (flags & TRYAGAIN)
- continue;
- if (flags & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return NULL;
- }
- FAIL2("panic: regpiece returned NULL, flags=%#"UVxf"", (UV) flags);
- }
- else if (ret == NULL)
- ret = latest;
- *flagp |= flags&(HASWIDTH|POSTPONED);
- if (chain == NULL) /* First piece. */
- *flagp |= flags&SPSTART;
- else {
- RExC_naughty++;
- REGTAIL(pRExC_state, chain, latest);
- }
- chain = latest;
- c++;
- }
- if (chain == NULL) { /* Loop ran zero times. */
- chain = reg_node(pRExC_state, NOTHING);
- if (ret == NULL)
- ret = chain;
- }
- if (c == 1) {
- *flagp |= flags&SIMPLE;
- }
-
- return ret;
-}
-
-/*
- - regpiece - something followed by possible [*+?]
- *
- * Note that the branching code sequences used for ? and the general cases
- * of * and + are somewhat optimized: they use the same NOTHING node as
- * both the endmarker for their branch list and the body of the last branch.
- * It might seem that this node could be dispensed with entirely, but the
- * endmarker role is not redundant.
- *
- * Returns NULL, setting *flagp to TRYAGAIN if regatom() returns NULL with
- * TRYAGAIN.
- * Returns NULL, setting *flagp to RESTART_UTF8 if the sizing scan needs to be
- * restarted.
- */
-STATIC regnode *
-S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
-{
- regnode *ret;
- char op;
- char *next;
- I32 flags;
- const char * const origparse = RExC_parse;
- I32 min;
- I32 max = REG_INFTY;
-#ifdef RE_TRACK_PATTERN_OFFSETS
- char *parse_start;
-#endif
- const char *maxpos = NULL;
-
- /* Save the original in case we change the emitted regop to a FAIL. */
- regnode * const orig_emit = RExC_emit;
-
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGPIECE;
-
- DEBUG_PARSE("piec");
-
- ret = regatom(pRExC_state, &flags,depth+1);
- if (ret == NULL) {
- if (flags & (TRYAGAIN|RESTART_UTF8))
- *flagp |= flags & (TRYAGAIN|RESTART_UTF8);
- else
- FAIL2("panic: regatom returned NULL, flags=%#"UVxf"", (UV) flags);
- return(NULL);
- }
-
- op = *RExC_parse;
-
- if (op == '{' && regcurly(RExC_parse)) {
- maxpos = NULL;
-#ifdef RE_TRACK_PATTERN_OFFSETS
- parse_start = RExC_parse; /* MJD */
-#endif
- next = RExC_parse + 1;
- while (isDIGIT(*next) || *next == ',') {
- if (*next == ',') {
- if (maxpos)
- break;
- else
- maxpos = next;
- }
- next++;
- }
- if (*next == '}') { /* got one */
- const char* endptr;
- if (!maxpos)
- maxpos = next;
- RExC_parse++;
- min = grok_atou(RExC_parse, &endptr);
- if (*maxpos == ',')
- maxpos++;
- else
- maxpos = RExC_parse;
- max = grok_atou(maxpos, &endptr);
- if (!max && *maxpos != '0')
- max = REG_INFTY; /* meaning "infinity" */
- else if (max >= REG_INFTY)
- vFAIL2("Quantifier in {,} bigger than %d", REG_INFTY - 1);
- RExC_parse = next;
- nextchar(pRExC_state);
- if (max < min) { /* If can't match, warn and optimize to fail
- unconditionally */
- if (SIZE_ONLY) {
- ckWARNreg(RExC_parse, "Quantifier {n,m} with n > m can't match");
-
- /* We can't back off the size because we have to reserve
- * enough space for all the things we are about to throw
- * away, but we can shrink it by the ammount we are about
- * to re-use here */
- RExC_size = PREVOPER(RExC_size) - regarglen[(U8)OPFAIL];
- }
- else {
- RExC_emit = orig_emit;
- }
- ret = reg_node(pRExC_state, OPFAIL);
- return ret;
- }
- else if (min == max
- && RExC_parse < RExC_end
- && (*RExC_parse == '?' || *RExC_parse == '+'))
- {
- if (SIZE_ONLY) {
- ckWARN2reg(RExC_parse + 1,
- "Useless use of greediness modifier '%c'",
- *RExC_parse);
- }
- /* Absorb the modifier, so later code doesn't see nor use
- * it */
- nextchar(pRExC_state);
- }
-
- do_curly:
- if ((flags&SIMPLE)) {
- RExC_naughty += 2 + RExC_naughty / 2;
- reginsert(pRExC_state, CURLY, ret, depth+1);
- Set_Node_Offset(ret, parse_start+1); /* MJD */
- Set_Node_Cur_Length(ret, parse_start);
- }
- else {
- regnode * const w = reg_node(pRExC_state, WHILEM);
-
- w->flags = 0;
- REGTAIL(pRExC_state, ret, w);
- if (!SIZE_ONLY && RExC_extralen) {
- reginsert(pRExC_state, LONGJMP,ret, depth+1);
- reginsert(pRExC_state, NOTHING,ret, depth+1);
- NEXT_OFF(ret) = 3; /* Go over LONGJMP. */
- }
- reginsert(pRExC_state, CURLYX,ret, depth+1);
- /* MJD hk */
- Set_Node_Offset(ret, parse_start+1);
- Set_Node_Length(ret,
- op == '{' ? (RExC_parse - parse_start) : 1);
-
- if (!SIZE_ONLY && RExC_extralen)
- NEXT_OFF(ret) = 3; /* Go over NOTHING to LONGJMP. */
- REGTAIL(pRExC_state, ret, reg_node(pRExC_state, NOTHING));
- if (SIZE_ONLY)
- RExC_whilem_seen++, RExC_extralen += 3;
- RExC_naughty += 4 + RExC_naughty; /* compound interest */
- }
- ret->flags = 0;
-
- if (min > 0)
- *flagp = WORST;
- if (max > 0)
- *flagp |= HASWIDTH;
- if (!SIZE_ONLY) {
- ARG1_SET(ret, (U16)min);
- ARG2_SET(ret, (U16)max);
- }
- if (max == REG_INFTY)
- RExC_seen |= REG_UNBOUNDED_QUANTIFIER_SEEN;
-
- goto nest_check;
- }
- }
-
- if (!ISMULT1(op)) {
- *flagp = flags;
- return(ret);
- }
-
-#if 0 /* Now runtime fix should be reliable. */
-
- /* if this is reinstated, don't forget to put this back into perldiag:
-
- =item Regexp *+ operand could be empty at {#} in regex m/%s/
-
- (F) The part of the regexp subject to either the * or + quantifier
- could match an empty string. The {#} shows in the regular
- expression about where the problem was discovered.
-
- */
-
- if (!(flags&HASWIDTH) && op != '?')
- vFAIL("Regexp *+ operand could be empty");
-#endif
-
-#ifdef RE_TRACK_PATTERN_OFFSETS
- parse_start = RExC_parse;
-#endif
- nextchar(pRExC_state);
-
- *flagp = (op != '+') ? (WORST|SPSTART|HASWIDTH) : (WORST|HASWIDTH);
-
- if (op == '*' && (flags&SIMPLE)) {
- reginsert(pRExC_state, STAR, ret, depth+1);
- ret->flags = 0;
- RExC_naughty += 4;
- RExC_seen |= REG_UNBOUNDED_QUANTIFIER_SEEN;
- }
- else if (op == '*') {
- min = 0;
- goto do_curly;
- }
- else if (op == '+' && (flags&SIMPLE)) {
- reginsert(pRExC_state, PLUS, ret, depth+1);
- ret->flags = 0;
- RExC_naughty += 3;
- RExC_seen |= REG_UNBOUNDED_QUANTIFIER_SEEN;
- }
- else if (op == '+') {
- min = 1;
- goto do_curly;
- }
- else if (op == '?') {
- min = 0; max = 1;
- goto do_curly;
- }
- nest_check:
- if (!SIZE_ONLY && !(flags&(HASWIDTH|POSTPONED)) && max > REG_INFTY/3) {
- SAVEFREESV(RExC_rx_sv); /* in case of fatal warnings */
- ckWARN2reg(RExC_parse,
- "%"UTF8f" matches null string many times",
- UTF8fARG(UTF, (RExC_parse >= origparse
- ? RExC_parse - origparse
- : 0),
- origparse));
- (void)ReREFCNT_inc(RExC_rx_sv);
- }
-
- if (RExC_parse < RExC_end && *RExC_parse == '?') {
- nextchar(pRExC_state);
- reginsert(pRExC_state, MINMOD, ret, depth+1);
- REGTAIL(pRExC_state, ret, ret + NODE_STEP_REGNODE);
- }
- else
- if (RExC_parse < RExC_end && *RExC_parse == '+') {
- regnode *ender;
- nextchar(pRExC_state);
- ender = reg_node(pRExC_state, SUCCEED);
- REGTAIL(pRExC_state, ret, ender);
- reginsert(pRExC_state, SUSPEND, ret, depth+1);
- ret->flags = 0;
- ender = reg_node(pRExC_state, TAIL);
- REGTAIL(pRExC_state, ret, ender);
- }
-
- if (RExC_parse < RExC_end && ISMULT2(RExC_parse)) {
- RExC_parse++;
- vFAIL("Nested quantifiers");
- }
-
- return(ret);
-}
-
-STATIC bool
-S_grok_bslash_N(pTHX_ RExC_state_t *pRExC_state, regnode** node_p,
- UV *valuep, I32 *flagp, U32 depth, bool in_char_class,
- const bool strict /* Apply stricter parsing rules? */
- )
-{
-
- /* This is expected to be called by a parser routine that has recognized '\N'
- and needs to handle the rest. RExC_parse is expected to point at the first
- char following the N at the time of the call. On successful return,
- RExC_parse has been updated to point to just after the sequence identified
- by this routine, and <*flagp> has been updated.
-
- The \N may be inside (indicated by the boolean <in_char_class>) or outside a
- character class.
-
- \N may begin either a named sequence, or if outside a character class, mean
- to match a non-newline. For non single-quoted regexes, the tokenizer has
- attempted to decide which, and in the case of a named sequence, converted it
- into one of the forms: \N{} (if the sequence is null), or \N{U+c1.c2...},
- where c1... are the characters in the sequence. For single-quoted regexes,
- the tokenizer passes the \N sequence through unchanged; this code will not
- attempt to determine this nor expand those, instead raising a syntax error.
- The net effect is that if the beginning of the passed-in pattern isn't '{U+'
- or there is no '}', it signals that this \N occurrence means to match a
- non-newline.
-
- Only the \N{U+...} form should occur in a character class, for the same
- reason that '.' inside a character class means to just match a period: it
- just doesn't make sense.
-
- The function raises an error (via vFAIL), and doesn't return for various
- syntax errors. Otherwise it returns TRUE and sets <node_p> or <valuep> on
- success; it returns FALSE otherwise. Returns FALSE, setting *flagp to
- RESTART_UTF8 if the sizing scan needs to be restarted. Such a restart is
- only possible if node_p is non-NULL.
-
-
- If <valuep> is non-null, it means the caller can accept an input sequence
- consisting of a just a single code point; <*valuep> is set to that value
- if the input is such.
-
- If <node_p> is non-null it signifies that the caller can accept any other
- legal sequence (i.e., one that isn't just a single code point). <*node_p>
- is set as follows:
- 1) \N means not-a-NL: points to a newly created REG_ANY node;
- 2) \N{}: points to a new NOTHING node;
- 3) otherwise: points to a new EXACT node containing the resolved
- string.
- Note that FALSE is returned for single code point sequences if <valuep> is
- null.
- */
-
- char * endbrace; /* '}' following the name */
- char* p;
- char *endchar; /* Points to '.' or '}' ending cur char in the input
- stream */
- bool has_multiple_chars; /* true if the input stream contains a sequence of
- more than one character */
-
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_GROK_BSLASH_N;
-
- GET_RE_DEBUG_FLAGS;
-
- assert(cBOOL(node_p) ^ cBOOL(valuep)); /* Exactly one should be set */
-
- /* The [^\n] meaning of \N ignores spaces and comments under the /x
- * modifier. The other meaning does not, so use a temporary until we find
- * out which we are being called with */
- p = (RExC_flags & RXf_PMf_EXTENDED)
- ? regpatws(pRExC_state, RExC_parse,
- TRUE) /* means recognize comments */
- : RExC_parse;
-
- /* Disambiguate between \N meaning a named character versus \N meaning
- * [^\n]. The former is assumed when it can't be the latter. */
- if (*p != '{' || regcurly(p)) {
- RExC_parse = p;
- if (! node_p) {
- /* no bare \N allowed in a charclass */
- if (in_char_class) {
- vFAIL("\\N in a character class must be a named character: \\N{...}");
- }
- return FALSE;
- }
- RExC_parse--; /* Need to back off so nextchar() doesn't skip the
- current char */
- nextchar(pRExC_state);
- *node_p = reg_node(pRExC_state, REG_ANY);
- *flagp |= HASWIDTH|SIMPLE;
- RExC_naughty++;
- Set_Node_Length(*node_p, 1); /* MJD */
- return TRUE;
- }
-
- /* Here, we have decided it should be a named character or sequence */
-
- /* The test above made sure that the next real character is a '{', but
- * under the /x modifier, it could be separated by space (or a comment and
- * \n) and this is not allowed (for consistency with \x{...} and the
- * tokenizer handling of \N{NAME}). */
- if (*RExC_parse != '{') {
- vFAIL("Missing braces on \\N{}");
- }
-
- RExC_parse++; /* Skip past the '{' */
-
- if (! (endbrace = strchr(RExC_parse, '}')) /* no trailing brace */
- || ! (endbrace == RExC_parse /* nothing between the {} */
- || (endbrace - RExC_parse >= 2 /* U+ (bad hex is checked below
- */
- && strnEQ(RExC_parse, "U+", 2)))) /* for a better error msg)
- */
- {
- if (endbrace) RExC_parse = endbrace; /* position msg's '<--HERE' */
- vFAIL("\\N{NAME} must be resolved by the lexer");
- }
-
- if (endbrace == RExC_parse) { /* empty: \N{} */
- bool ret = TRUE;
- if (node_p) {
- *node_p = reg_node(pRExC_state,NOTHING);
- }
- else if (in_char_class) {
- if (SIZE_ONLY && in_char_class) {
- if (strict) {
- RExC_parse++; /* Position after the "}" */
- vFAIL("Zero length \\N{}");
- }
- else {
- ckWARNreg(RExC_parse,
- "Ignoring zero length \\N{} in character class");
- }
- }
- ret = FALSE;
- }
- else {
- return FALSE;
- }
- nextchar(pRExC_state);
- return ret;
- }
-
- RExC_uni_semantics = 1; /* Unicode named chars imply Unicode semantics */
- RExC_parse += 2; /* Skip past the 'U+' */
-
- endchar = RExC_parse + strcspn(RExC_parse, ".}");
-
- /* Code points are separated by dots. If none, there is only one code
- * point, and is terminated by the brace */
- has_multiple_chars = (endchar < endbrace);
-
- if (valuep && (! has_multiple_chars || in_char_class)) {
- /* We only pay attention to the first char of
- multichar strings being returned in char classes. I kinda wonder
- if this makes sense as it does change the behaviour
- from earlier versions, OTOH that behaviour was broken
- as well. XXX Solution is to recharacterize as
- [rest-of-class]|multi1|multi2... */
-
- STRLEN length_of_hex = (STRLEN)(endchar - RExC_parse);
- I32 grok_hex_flags = PERL_SCAN_ALLOW_UNDERSCORES
- | PERL_SCAN_DISALLOW_PREFIX
- | (SIZE_ONLY ? PERL_SCAN_SILENT_ILLDIGIT : 0);
-
- *valuep = grok_hex(RExC_parse, &length_of_hex, &grok_hex_flags, NULL);
-
- /* The tokenizer should have guaranteed validity, but it's possible to
- * bypass it by using single quoting, so check */
- if (length_of_hex == 0
- || length_of_hex != (STRLEN)(endchar - RExC_parse) )
- {
- RExC_parse += length_of_hex; /* Includes all the valid */
- RExC_parse += (RExC_orig_utf8) /* point to after 1st invalid */
- ? UTF8SKIP(RExC_parse)
- : 1;
- /* Guard against malformed utf8 */
- if (RExC_parse >= endchar) {
- RExC_parse = endchar;
- }
- vFAIL("Invalid hexadecimal number in \\N{U+...}");
- }
-
- if (in_char_class && has_multiple_chars) {
- if (strict) {
- RExC_parse = endbrace;
- vFAIL("\\N{} in character class restricted to one character");
- }
- else {
- ckWARNreg(endchar, "Using just the first character returned by \\N{} in character class");
- }
- }
-
- RExC_parse = endbrace + 1;
- }
- else if (! node_p || ! has_multiple_chars) {
-
- /* Here, the input is legal, but not according to the caller's
- * options. We fail without advancing the parse, so that the
- * caller can try again */
- RExC_parse = p;
- return FALSE;
- }
- else {
-
- /* What is done here is to convert this to a sub-pattern of the form
- * (?:\x{char1}\x{char2}...)
- * and then call reg recursively. That way, it retains its atomicness,
- * while not having to worry about special handling that some code
- * points may have. toke.c has converted the original Unicode values
- * to native, so that we can just pass on the hex values unchanged. We
- * do have to set a flag to keep recoding from happening in the
- * recursion */
-
- SV * substitute_parse = newSVpvn_flags("?:", 2, SVf_UTF8|SVs_TEMP);
- STRLEN len;
- char *orig_end = RExC_end;
- I32 flags;
-
- while (RExC_parse < endbrace) {
-
- /* Convert to notation the rest of the code understands */
- sv_catpv(substitute_parse, "\\x{");
- sv_catpvn(substitute_parse, RExC_parse, endchar - RExC_parse);
- sv_catpv(substitute_parse, "}");
-
- /* Point to the beginning of the next character in the sequence. */
- RExC_parse = endchar + 1;
- endchar = RExC_parse + strcspn(RExC_parse, ".}");
- }
- sv_catpv(substitute_parse, ")");
-
- RExC_parse = SvPV(substitute_parse, len);
-
- /* Don't allow empty number */
- if (len < 8) {
- vFAIL("Invalid hexadecimal number in \\N{U+...}");
- }
- RExC_end = RExC_parse + len;
-
- /* The values are Unicode, and therefore not subject to recoding */
- RExC_override_recoding = 1;
-
- if (!(*node_p = reg(pRExC_state, 1, &flags, depth+1))) {
- if (flags & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return FALSE;
- }
- FAIL2("panic: reg returned NULL to grok_bslash_N, flags=%#"UVxf"",
- (UV) flags);
- }
- *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE|POSTPONED);
-
- RExC_parse = endbrace;
- RExC_end = orig_end;
- RExC_override_recoding = 0;
-
- nextchar(pRExC_state);
- }
-
- return TRUE;
-}
-
-
-/*
- * reg_recode
- *
- * It returns the code point in utf8 for the value in *encp.
- * value: a code value in the source encoding
- * encp: a pointer to an Encode object
- *
- * If the result from Encode is not a single character,
- * it returns U+FFFD (Replacement character) and sets *encp to NULL.
- */
-STATIC UV
-S_reg_recode(pTHX_ const char value, SV **encp)
-{
- STRLEN numlen = 1;
- SV * const sv = newSVpvn_flags(&value, numlen, SVs_TEMP);
- const char * const s = *encp ? sv_recode_to_utf8(sv, *encp) : SvPVX(sv);
- const STRLEN newlen = SvCUR(sv);
- UV uv = UNICODE_REPLACEMENT;
-
- PERL_ARGS_ASSERT_REG_RECODE;
-
- if (newlen)
- uv = SvUTF8(sv)
- ? utf8n_to_uvchr((U8*)s, newlen, &numlen, UTF8_ALLOW_DEFAULT)
- : *(U8*)s;
-
- if (!newlen || numlen != newlen) {
- uv = UNICODE_REPLACEMENT;
- *encp = NULL;
- }
- return uv;
-}
-
-PERL_STATIC_INLINE U8
-S_compute_EXACTish(RExC_state_t *pRExC_state)
-{
- U8 op;
-
- PERL_ARGS_ASSERT_COMPUTE_EXACTISH;
-
- if (! FOLD) {
- return EXACT;
- }
-
- op = get_regex_charset(RExC_flags);
- if (op >= REGEX_ASCII_RESTRICTED_CHARSET) {
- op--; /* /a is same as /u, and map /aa's offset to what /a's would have
- been, so there is no hole */
- }
-
- return op + EXACTF;
-}
-
-PERL_STATIC_INLINE void
-S_alloc_maybe_populate_EXACT(pTHX_ RExC_state_t *pRExC_state,
- regnode *node, I32* flagp, STRLEN len, UV code_point,
- bool downgradable)
-{
- /* This knows the details about sizing an EXACTish node, setting flags for
- * it (by setting <*flagp>, and potentially populating it with a single
- * character.
- *
- * If <len> (the length in bytes) is non-zero, this function assumes that
- * the node has already been populated, and just does the sizing. In this
- * case <code_point> should be the final code point that has already been
- * placed into the node. This value will be ignored except that under some
- * circumstances <*flagp> is set based on it.
- *
- * If <len> is zero, the function assumes that the node is to contain only
- * the single character given by <code_point> and calculates what <len>
- * should be. In pass 1, it sizes the node appropriately. In pass 2, it
- * additionally will populate the node's STRING with <code_point> or its
- * fold if folding.
- *
- * In both cases <*flagp> is appropriately set
- *
- * It knows that under FOLD, the Latin Sharp S and UTF characters above
- * 255, must be folded (the former only when the rules indicate it can
- * match 'ss')
- *
- * When it does the populating, it looks at the flag 'downgradable'. If
- * true with a node that folds, it checks if the single code point
- * participates in a fold, and if not downgrades the node to an EXACT.
- * This helps the optimizer */
-
- bool len_passed_in = cBOOL(len != 0);
- U8 character[UTF8_MAXBYTES_CASE+1];
-
- PERL_ARGS_ASSERT_ALLOC_MAYBE_POPULATE_EXACT;
-
- /* Don't bother to check for downgrading in PASS1, as it doesn't make any
- * sizing difference, and is extra work that is thrown away */
- if (downgradable && ! PASS2) {
- downgradable = FALSE;
- }
-
- if (! len_passed_in) {
- if (UTF) {
- if (UNI_IS_INVARIANT(code_point)) {
- if (LOC || ! FOLD) { /* /l defers folding until runtime */
- *character = (U8) code_point;
- }
- else { /* Here is /i and not /l (toFOLD() is defined on just
- ASCII, which isn't the same thing as INVARIANT on
- EBCDIC, but it works there, as the extra invariants
- fold to themselves) */
- *character = toFOLD((U8) code_point);
- if (downgradable
- && *character == code_point
- && ! HAS_NONLATIN1_FOLD_CLOSURE(code_point))
- {
- OP(node) = EXACT;
- }
- }
- len = 1;
- }
- else if (FOLD && (! LOC
- || ! is_PROBLEMATIC_LOCALE_FOLD_cp(code_point)))
- { /* Folding, and ok to do so now */
- UV folded = _to_uni_fold_flags(
- code_point,
- character,
- &len,
- FOLD_FLAGS_FULL | ((ASCII_FOLD_RESTRICTED)
- ? FOLD_FLAGS_NOMIX_ASCII
- : 0));
- if (downgradable
- && folded == code_point
- && ! _invlist_contains_cp(PL_utf8_foldable, code_point))
- {
- OP(node) = EXACT;
- }
- }
- else if (code_point <= MAX_UTF8_TWO_BYTE) {
-
- /* Not folding this cp, and can output it directly */
- *character = UTF8_TWO_BYTE_HI(code_point);
- *(character + 1) = UTF8_TWO_BYTE_LO(code_point);
- len = 2;
- }
- else {
- uvchr_to_utf8( character, code_point);
- len = UTF8SKIP(character);
- }
- } /* Else pattern isn't UTF8. */
- else if (! FOLD) {
- *character = (U8) code_point;
- len = 1;
- } /* Else is folded non-UTF8 */
- else if (LIKELY(code_point != LATIN_SMALL_LETTER_SHARP_S)) {
-
- /* We don't fold any non-UTF8 except possibly the Sharp s (see
- * comments at join_exact()); */
- *character = (U8) code_point;
- len = 1;
-
- /* Can turn into an EXACT node if we know the fold at compile time,
- * and it folds to itself and doesn't particpate in other folds */
- if (downgradable
- && ! LOC
- && PL_fold_latin1[code_point] == code_point
- && (! HAS_NONLATIN1_FOLD_CLOSURE(code_point)
- || (isASCII(code_point) && ASCII_FOLD_RESTRICTED)))
- {
- OP(node) = EXACT;
- }
- } /* else is Sharp s. May need to fold it */
- else if (AT_LEAST_UNI_SEMANTICS && ! ASCII_FOLD_RESTRICTED) {
- *character = 's';
- *(character + 1) = 's';
- len = 2;
- }
- else {
- *character = LATIN_SMALL_LETTER_SHARP_S;
- len = 1;
- }
- }
-
- if (SIZE_ONLY) {
- RExC_size += STR_SZ(len);
- }
- else {
- RExC_emit += STR_SZ(len);
- STR_LEN(node) = len;
- if (! len_passed_in) {
- Copy((char *) character, STRING(node), len, char);
- }
- }
-
- *flagp |= HASWIDTH;
-
- /* A single character node is SIMPLE, except for the special-cased SHARP S
- * under /di. */
- if ((len == 1 || (UTF && len == UNISKIP(code_point)))
- && (code_point != LATIN_SMALL_LETTER_SHARP_S
- || ! FOLD || ! DEPENDS_SEMANTICS))
- {
- *flagp |= SIMPLE;
- }
-
- /* The OP may not be well defined in PASS1 */
- if (PASS2 && OP(node) == EXACTFL) {
- RExC_contains_locale = 1;
- }
-}
-
-
-/* Parse backref decimal value, unless it's too big to sensibly be a backref,
- * in which case return I32_MAX (rather than possibly 32-bit wrapping) */
-
-static I32
-S_backref_value(char *p)
-{
- const char* endptr;
- UV val = grok_atou(p, &endptr);
- if (endptr == p || endptr == NULL || val > I32_MAX)
- return I32_MAX;
- return (I32)val;
-}
-
-
-/*
- - regatom - the lowest level
-
- Try to identify anything special at the start of the pattern. If there
- is, then handle it as required. This may involve generating a single regop,
- such as for an assertion; or it may involve recursing, such as to
- handle a () structure.
-
- If the string doesn't start with something special then we gobble up
- as much literal text as we can.
-
- Once we have been able to handle whatever type of thing started the
- sequence, we return.
-
- Note: we have to be careful with escapes, as they can be both literal
- and special, and in the case of \10 and friends, context determines which.
-
- A summary of the code structure is:
-
- switch (first_byte) {
- cases for each special:
- handle this special;
- break;
- case '\\':
- switch (2nd byte) {
- cases for each unambiguous special:
- handle this special;
- break;
- cases for each ambigous special/literal:
- disambiguate;
- if (special) handle here
- else goto defchar;
- default: // unambiguously literal:
- goto defchar;
- }
- default: // is a literal char
- // FALL THROUGH
- defchar:
- create EXACTish node for literal;
- while (more input and node isn't full) {
- switch (input_byte) {
- cases for each special;
- make sure parse pointer is set so that the next call to
- regatom will see this special first
- goto loopdone; // EXACTish node terminated by prev. char
- default:
- append char to EXACTISH node;
- }
- get next input byte;
- }
- loopdone:
- }
- return the generated node;
-
- Specifically there are two separate switches for handling
- escape sequences, with the one for handling literal escapes requiring
- a dummy entry for all of the special escapes that are actually handled
- by the other.
-
- Returns NULL, setting *flagp to TRYAGAIN if reg() returns NULL with
- TRYAGAIN.
- Returns NULL, setting *flagp to RESTART_UTF8 if the sizing scan needs to be
- restarted.
- Otherwise does not return NULL.
-*/
-
-STATIC regnode *
-S_regatom(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth)
-{
- regnode *ret = NULL;
- I32 flags = 0;
- char *parse_start = RExC_parse;
- U8 op;
- int invert = 0;
- U8 arg;
-
- GET_RE_DEBUG_FLAGS_DECL;
-
- *flagp = WORST; /* Tentatively. */
-
- DEBUG_PARSE("atom");
-
- PERL_ARGS_ASSERT_REGATOM;
-
-tryagain:
- switch ((U8)*RExC_parse) {
- case '^':
- RExC_seen_zerolen++;
- nextchar(pRExC_state);
- if (RExC_flags & RXf_PMf_MULTILINE)
- ret = reg_node(pRExC_state, MBOL);
- else if (RExC_flags & RXf_PMf_SINGLELINE)
- ret = reg_node(pRExC_state, SBOL);
- else
- ret = reg_node(pRExC_state, BOL);
- Set_Node_Length(ret, 1); /* MJD */
- break;
- case '$':
- nextchar(pRExC_state);
- if (*RExC_parse)
- RExC_seen_zerolen++;
- if (RExC_flags & RXf_PMf_MULTILINE)
- ret = reg_node(pRExC_state, MEOL);
- else if (RExC_flags & RXf_PMf_SINGLELINE)
- ret = reg_node(pRExC_state, SEOL);
- else
- ret = reg_node(pRExC_state, EOL);
- Set_Node_Length(ret, 1); /* MJD */
- break;
- case '.':
- nextchar(pRExC_state);
- if (RExC_flags & RXf_PMf_SINGLELINE)
- ret = reg_node(pRExC_state, SANY);
- else
- ret = reg_node(pRExC_state, REG_ANY);
- *flagp |= HASWIDTH|SIMPLE;
- RExC_naughty++;
- Set_Node_Length(ret, 1); /* MJD */
- break;
- case '[':
- {
- char * const oregcomp_parse = ++RExC_parse;
- ret = regclass(pRExC_state, flagp,depth+1,
- FALSE, /* means parse the whole char class */
- TRUE, /* allow multi-char folds */
- FALSE, /* don't silence non-portable warnings. */
- NULL);
- if (*RExC_parse != ']') {
- RExC_parse = oregcomp_parse;
- vFAIL("Unmatched [");
- }
- if (ret == NULL) {
- if (*flagp & RESTART_UTF8)
- return NULL;
- FAIL2("panic: regclass returned NULL to regatom, flags=%#"UVxf"",
- (UV) *flagp);
- }
- nextchar(pRExC_state);
- Set_Node_Length(ret, RExC_parse - oregcomp_parse + 1); /* MJD */
- break;
- }
- case '(':
- nextchar(pRExC_state);
- ret = reg(pRExC_state, 2, &flags,depth+1);
- if (ret == NULL) {
- if (flags & TRYAGAIN) {
- if (RExC_parse == RExC_end) {
- /* Make parent create an empty node if needed. */
- *flagp |= TRYAGAIN;
- return(NULL);
- }
- goto tryagain;
- }
- if (flags & RESTART_UTF8) {
- *flagp = RESTART_UTF8;
- return NULL;
- }
- FAIL2("panic: reg returned NULL to regatom, flags=%#"UVxf"",
- (UV) flags);
- }
- *flagp |= flags&(HASWIDTH|SPSTART|SIMPLE|POSTPONED);
- break;
- case '|':
- case ')':
- if (flags & TRYAGAIN) {
- *flagp |= TRYAGAIN;
- return NULL;
- }
- vFAIL("Internal urp");
- /* Supposed to be caught earlier. */
- break;
- case '?':
- case '+':
- case '*':
- RExC_parse++;
- vFAIL("Quantifier follows nothing");
- break;
- case '\\':
- /* Special Escapes
-
- This switch handles escape sequences that resolve to some kind
- of special regop and not to literal text. Escape sequnces that
- resolve to literal text are handled below in the switch marked
- "Literal Escapes".
-
- Every entry in this switch *must* have a corresponding entry
- in the literal escape switch. However, the opposite is not
- required, as the default for this switch is to jump to the
- literal text handling code.
- */
- switch ((U8)*++RExC_parse) {
- /* Special Escapes */
- case 'A':
- RExC_seen_zerolen++;
- ret = reg_node(pRExC_state, SBOL);
- *flagp |= SIMPLE;
- goto finish_meta_pat;
- case 'G':
- ret = reg_node(pRExC_state, GPOS);
- RExC_seen |= REG_GPOS_SEEN;
- *flagp |= SIMPLE;
- goto finish_meta_pat;
- case 'K':
- RExC_seen_zerolen++;
- ret = reg_node(pRExC_state, KEEPS);
- *flagp |= SIMPLE;
- /* XXX:dmq : disabling in-place substitution seems to
- * be necessary here to avoid cases of memory corruption, as
- * with: C<$_="x" x 80; s/x\K/y/> -- rgs
- */
- RExC_seen |= REG_LOOKBEHIND_SEEN;
- goto finish_meta_pat;
- case 'Z':
- ret = reg_node(pRExC_state, SEOL);
- *flagp |= SIMPLE;
- RExC_seen_zerolen++; /* Do not optimize RE away */
- goto finish_meta_pat;
- case 'z':
- ret = reg_node(pRExC_state, EOS);
- *flagp |= SIMPLE;
- RExC_seen_zerolen++; /* Do not optimize RE away */
- goto finish_meta_pat;
- case 'C':
- ret = reg_node(pRExC_state, CANY);
- RExC_seen |= REG_CANY_SEEN;
- *flagp |= HASWIDTH|SIMPLE;
- if (SIZE_ONLY) {
- ckWARNdep(RExC_parse+1, "\\C is deprecated");
- }
- goto finish_meta_pat;
- case 'X':
- ret = reg_node(pRExC_state, CLUMP);
- *flagp |= HASWIDTH;
- goto finish_meta_pat;
-
- case 'W':
- invert = 1;
- /* FALLTHROUGH */
- case 'w':
- arg = ANYOF_WORDCHAR;
- goto join_posix;
-
- case 'b':
- RExC_seen_zerolen++;
- RExC_seen |= REG_LOOKBEHIND_SEEN;
- op = BOUND + get_regex_charset(RExC_flags);
- if (op > BOUNDA) { /* /aa is same as /a */
- op = BOUNDA;
- }
- else if (op == BOUNDL) {
- RExC_contains_locale = 1;
- }
- ret = reg_node(pRExC_state, op);
- FLAGS(ret) = get_regex_charset(RExC_flags);
- *flagp |= SIMPLE;
- if (! SIZE_ONLY && (U8) *(RExC_parse + 1) == '{') {
- /* diag_listed_as: Use "%s" instead of "%s" */
- vFAIL("Use \"\\b\\{\" instead of \"\\b{\"");
- }
- goto finish_meta_pat;
- case 'B':
- RExC_seen_zerolen++;
- RExC_seen |= REG_LOOKBEHIND_SEEN;
- op = NBOUND + get_regex_charset(RExC_flags);
- if (op > NBOUNDA) { /* /aa is same as /a */
- op = NBOUNDA;
- }
- else if (op == NBOUNDL) {
- RExC_contains_locale = 1;
- }
- ret = reg_node(pRExC_state, op);
- FLAGS(ret) = get_regex_charset(RExC_flags);
- *flagp |= SIMPLE;
- if (! SIZE_ONLY && (U8) *(RExC_parse + 1) == '{') {
- /* diag_listed_as: Use "%s" instead of "%s" */
- vFAIL("Use \"\\B\\{\" instead of \"\\B{\"");
- }
- goto finish_meta_pat;
-
- case 'D':
- invert = 1;
- /* FALLTHROUGH */
- case 'd':
- arg = ANYOF_DIGIT;
- goto join_posix;
-
- case 'R':
- ret = reg_node(pRExC_state, LNBREAK);
- *flagp |= HASWIDTH|SIMPLE;
- goto finish_meta_pat;
-
- case 'H':
- invert = 1;
- /* FALLTHROUGH */
- case 'h':
- arg = ANYOF_BLANK;
- op = POSIXU;
- goto join_posix_op_known;
-
- case 'V':
- invert = 1;
- /* FALLTHROUGH */
- case 'v':
- arg = ANYOF_VERTWS;
- op = POSIXU;
- goto join_posix_op_known;
-
- case 'S':
- invert = 1;
- /* FALLTHROUGH */
- case 's':
- arg = ANYOF_SPACE;
-
- join_posix:
-
- op = POSIXD + get_regex_charset(RExC_flags);
- if (op > POSIXA) { /* /aa is same as /a */
- op = POSIXA;
- }
- else if (op == POSIXL) {
- RExC_contains_locale = 1;
- }
-
- join_posix_op_known:
-
- if (invert) {
- op += NPOSIXD - POSIXD;
- }
-
- ret = reg_node(pRExC_state, op);
- if (! SIZE_ONLY) {
- FLAGS(ret) = namedclass_to_classnum(arg);
- }
-
- *flagp |= HASWIDTH|SIMPLE;
- /* FALLTHROUGH */
-
- finish_meta_pat:
- nextchar(pRExC_state);
- Set_Node_Length(ret, 2); /* MJD */
- break;
- case 'p':
- case 'P':
- {
-#ifdef DEBUGGING
- char* parse_start = RExC_parse - 2;
-#endif
-
- RExC_parse--;
-
- ret = regclass(pRExC_state, flagp,depth+1,
- TRUE, /* means just parse this element */
- FALSE, /* don't allow multi-char folds */
- FALSE, /* don't silence non-portable warnings.
- It would be a bug if these returned
- non-portables */
- NULL);
- /* regclass() can only return RESTART_UTF8 if multi-char folds
- are allowed. */
- if (!ret)
- FAIL2("panic: regclass returned NULL to regatom, flags=%#"UVxf"",
- (UV) *flagp);
-
- RExC_parse--;
-
- Set_Node_Offset(ret, parse_start + 2);
- Set_Node_Cur_Length(ret, parse_start);
- nextchar(pRExC_state);
- }
- break;
- case 'N':
- /* Handle \N and \N{NAME} with multiple code points here and not
- * below because it can be multicharacter. join_exact() will join
- * them up later on. Also this makes sure that things like
- * /\N{BLAH}+/ and \N{BLAH} being multi char Just Happen. dmq.
- * The options to the grok function call causes it to fail if the
- * sequence is just a single code point. We then go treat it as
- * just another character in the current EXACT node, and hence it
- * gets uniform treatment with all the other characters. The
- * special treatment for quantifiers is not needed for such single
- * character sequences */
- ++RExC_parse;
- if (! grok_bslash_N(pRExC_state, &ret, NULL, flagp, depth, FALSE,
- FALSE /* not strict */ )) {
- if (*flagp & RESTART_UTF8)
- return NULL;
- RExC_parse--;
- goto defchar;
- }
- break;
- case 'k': /* Handle \k<NAME> and \k'NAME' */
- parse_named_seq:
- {
- char ch= RExC_parse[1];
- if (ch != '<' && ch != '\'' && ch != '{') {
- RExC_parse++;
- /* diag_listed_as: Sequence \%s... not terminated in regex; marked by <-- HERE in m/%s/ */
- vFAIL2("Sequence %.2s... not terminated",parse_start);
- } else {
- /* this pretty much dupes the code for (?P=...) in reg(), if
- you change this make sure you change that */
- char* name_start = (RExC_parse += 2);
- U32 num = 0;
- SV *sv_dat = reg_scan_name(pRExC_state,
- SIZE_ONLY ? REG_RSN_RETURN_NULL : REG_RSN_RETURN_DATA);
- ch= (ch == '<') ? '>' : (ch == '{') ? '}' : '\'';
- if (RExC_parse == name_start || *RExC_parse != ch)
- /* diag_listed_as: Sequence \%s... not terminated in regex; marked by <-- HERE in m/%s/ */
- vFAIL2("Sequence %.3s... not terminated",parse_start);
-
- if (!SIZE_ONLY) {
- num = add_data( pRExC_state, STR_WITH_LEN("S"));
- RExC_rxi->data->data[num]=(void*)sv_dat;
- SvREFCNT_inc_simple_void(sv_dat);
- }
-
- RExC_sawback = 1;
- ret = reganode(pRExC_state,
- ((! FOLD)
- ? NREF
- : (ASCII_FOLD_RESTRICTED)
- ? NREFFA
- : (AT_LEAST_UNI_SEMANTICS)
- ? NREFFU
- : (LOC)
- ? NREFFL
- : NREFF),
- num);
- *flagp |= HASWIDTH;
-
- /* override incorrect value set in reganode MJD */
- Set_Node_Offset(ret, parse_start+1);
- Set_Node_Cur_Length(ret, parse_start);
- nextchar(pRExC_state);
-
- }
- break;
- }
- case 'g':
- case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- {
- I32 num;
- bool hasbrace = 0;
-
- if (*RExC_parse == 'g') {
- bool isrel = 0;
-
- RExC_parse++;
- if (*RExC_parse == '{') {
- RExC_parse++;
- hasbrace = 1;
- }
- if (*RExC_parse == '-') {
- RExC_parse++;
- isrel = 1;
- }
- if (hasbrace && !isDIGIT(*RExC_parse)) {
- if (isrel) RExC_parse--;
- RExC_parse -= 2;
- goto parse_named_seq;
- }
-
- num = S_backref_value(RExC_parse);
- if (num == 0)
- vFAIL("Reference to invalid group 0");
- else if (num == I32_MAX) {
- if (isDIGIT(*RExC_parse))
- vFAIL("Reference to nonexistent group");
- else
- vFAIL("Unterminated \\g... pattern");
- }
-
- if (isrel) {
- num = RExC_npar - num;
- if (num < 1)
- vFAIL("Reference to nonexistent or unclosed group");
- }
- }
- else {
- num = S_backref_value(RExC_parse);
- /* bare \NNN might be backref or octal - if it is larger than or equal
- * RExC_npar then it is assumed to be and octal escape.
- * Note RExC_npar is +1 from the actual number of parens*/
- if (num == I32_MAX || (num > 9 && num >= RExC_npar
- && *RExC_parse != '8' && *RExC_parse != '9'))
- {
- /* Probably a character specified in octal, e.g. \35 */
- goto defchar;
- }
- }
-
- /* at this point RExC_parse definitely points to a backref
- * number */
- {
-#ifdef RE_TRACK_PATTERN_OFFSETS
- char * const parse_start = RExC_parse - 1; /* MJD */
-#endif
- while (isDIGIT(*RExC_parse))
- RExC_parse++;
- if (hasbrace) {
- if (*RExC_parse != '}')
- vFAIL("Unterminated \\g{...} pattern");
- RExC_parse++;
- }
- if (!SIZE_ONLY) {
- if (num > (I32)RExC_rx->nparens)
- vFAIL("Reference to nonexistent group");
- }
- RExC_sawback = 1;
- ret = reganode(pRExC_state,
- ((! FOLD)
- ? REF
- : (ASCII_FOLD_RESTRICTED)
- ? REFFA
- : (AT_LEAST_UNI_SEMANTICS)
- ? REFFU
- : (LOC)
- ? REFFL
- : REFF),
- num);
- *flagp |= HASWIDTH;
-
- /* override incorrect value set in reganode MJD */
- Set_Node_Offset(ret, parse_start+1);
- Set_Node_Cur_Length(ret, parse_start);
- RExC_parse--;
- nextchar(pRExC_state);
- }
- }
- break;
- case '\0':
- if (RExC_parse >= RExC_end)
- FAIL("Trailing \\");
- /* FALLTHROUGH */
- default:
- /* Do not generate "unrecognized" warnings here, we fall
- back into the quick-grab loop below */
- parse_start--;
- goto defchar;
- }
- break;
-
- case '#':
- if (RExC_flags & RXf_PMf_EXTENDED) {
- RExC_parse = reg_skipcomment( pRExC_state, RExC_parse );
- if (RExC_parse < RExC_end)
- goto tryagain;
- }
- /* FALLTHROUGH */
-
- default:
-
- parse_start = RExC_parse - 1;
-
- RExC_parse++;
-
- defchar: {
- STRLEN len = 0;
- UV ender = 0;
- char *p;
- char *s;
-#define MAX_NODE_STRING_SIZE 127
- char foldbuf[MAX_NODE_STRING_SIZE+UTF8_MAXBYTES_CASE];
- char *s0;
- U8 upper_parse = MAX_NODE_STRING_SIZE;
- U8 node_type = compute_EXACTish(pRExC_state);
- bool next_is_quantifier;
- char * oldp = NULL;
-
- /* We can convert EXACTF nodes to EXACTFU if they contain only
- * characters that match identically regardless of the target
- * string's UTF8ness. The reason to do this is that EXACTF is not
- * trie-able, EXACTFU is.
- *
- * Similarly, we can convert EXACTFL nodes to EXACTFU if they
- * contain only above-Latin1 characters (hence must be in UTF8),
- * which don't participate in folds with Latin1-range characters,
- * as the latter's folds aren't known until runtime. (We don't
- * need to figure this out until pass 2) */
- bool maybe_exactfu = PASS2
- && (node_type == EXACTF || node_type == EXACTFL);
-
- /* If a folding node contains only code points that don't
- * participate in folds, it can be changed into an EXACT node,
- * which allows the optimizer more things to look for */
- bool maybe_exact;
-
- ret = reg_node(pRExC_state, node_type);
-
- /* In pass1, folded, we use a temporary buffer instead of the
- * actual node, as the node doesn't exist yet */
- s = (SIZE_ONLY && FOLD) ? foldbuf : STRING(ret);
-
- s0 = s;
-
- reparse:
-
- /* We do the EXACTFish to EXACT node only if folding. (And we
- * don't need to figure this out until pass 2) */
- maybe_exact = FOLD && PASS2;
-
- /* XXX The node can hold up to 255 bytes, yet this only goes to
- * 127. I (khw) do not know why. Keeping it somewhat less than
- * 255 allows us to not have to worry about overflow due to
- * converting to utf8 and fold expansion, but that value is
- * 255-UTF8_MAXBYTES_CASE. join_exact() may join adjacent nodes
- * split up by this limit into a single one using the real max of
- * 255. Even at 127, this breaks under rare circumstances. If
- * folding, we do not want to split a node at a character that is a
- * non-final in a multi-char fold, as an input string could just
- * happen to want to match across the node boundary. The join
- * would solve that problem if the join actually happens. But a
- * series of more than two nodes in a row each of 127 would cause
- * the first join to succeed to get to 254, but then there wouldn't
- * be room for the next one, which could at be one of those split
- * multi-char folds. I don't know of any fool-proof solution. One
- * could back off to end with only a code point that isn't such a
- * non-final, but it is possible for there not to be any in the
- * entire node. */
- for (p = RExC_parse - 1;
- len < upper_parse && p < RExC_end;
- len++)
- {
- oldp = p;
-
- if (RExC_flags & RXf_PMf_EXTENDED)
- p = regpatws(pRExC_state, p,
- TRUE); /* means recognize comments */
- switch ((U8)*p) {
- case '^':
- case '$':
- case '.':
- case '[':
- case '(':
- case ')':
- case '|':
- goto loopdone;
- case '\\':
- /* Literal Escapes Switch
-
- This switch is meant to handle escape sequences that
- resolve to a literal character.
-
- Every escape sequence that represents something
- else, like an assertion or a char class, is handled
- in the switch marked 'Special Escapes' above in this
- routine, but also has an entry here as anything that
- isn't explicitly mentioned here will be treated as
- an unescaped equivalent literal.
- */
-
- switch ((U8)*++p) {
- /* These are all the special escapes. */
- case 'A': /* Start assertion */
- case 'b': case 'B': /* Word-boundary assertion*/
- case 'C': /* Single char !DANGEROUS! */
- case 'd': case 'D': /* digit class */
- case 'g': case 'G': /* generic-backref, pos assertion */
- case 'h': case 'H': /* HORIZWS */
- case 'k': case 'K': /* named backref, keep marker */
- case 'p': case 'P': /* Unicode property */
- case 'R': /* LNBREAK */
- case 's': case 'S': /* space class */
- case 'v': case 'V': /* VERTWS */
- case 'w': case 'W': /* word class */
- case 'X': /* eXtended Unicode "combining
- character sequence" */
- case 'z': case 'Z': /* End of line/string assertion */
- --p;
- goto loopdone;
-
- /* Anything after here is an escape that resolves to a
- literal. (Except digits, which may or may not)
- */
- case 'n':
- ender = '\n';
- p++;
- break;
- case 'N': /* Handle a single-code point named character. */
- /* The options cause it to fail if a multiple code
- * point sequence. Handle those in the switch() above
- * */
- RExC_parse = p + 1;
- if (! grok_bslash_N(pRExC_state, NULL, &ender,
- flagp, depth, FALSE,
- FALSE /* not strict */ ))
- {
- if (*flagp & RESTART_UTF8)
- FAIL("panic: grok_bslash_N set RESTART_UTF8");
- RExC_parse = p = oldp;
- goto loopdone;
- }
- p = RExC_parse;
- if (ender > 0xff) {
- REQUIRE_UTF8;
- }
- break;
- case 'r':
- ender = '\r';
- p++;
- break;
- case 't':
- ender = '\t';
- p++;
- break;
- case 'f':
- ender = '\f';
- p++;
- break;
- case 'e':
- ender = ASCII_TO_NATIVE('\033');
- p++;
- break;
- case 'a':
- ender = '\a';
- p++;
- break;
- case 'o':
- {
- UV result;
- const char* error_msg;
-
- bool valid = grok_bslash_o(&p,
- &result,
- &error_msg,
- TRUE, /* out warnings */
- FALSE, /* not strict */
- TRUE, /* Output warnings
- for non-
- portables */
- UTF);
- if (! valid) {
- RExC_parse = p; /* going to die anyway; point
- to exact spot of failure */
- vFAIL(error_msg);
- }
- ender = result;
- if (PL_encoding && ender < 0x100) {
- goto recode_encoding;
- }
- if (ender > 0xff) {
- REQUIRE_UTF8;
- }
- break;
- }
- case 'x':
- {
- UV result = UV_MAX; /* initialize to erroneous
- value */
- const char* error_msg;
-
- bool valid = grok_bslash_x(&p,
- &result,
- &error_msg,
- TRUE, /* out warnings */
- FALSE, /* not strict */
- TRUE, /* Output warnings
- for non-
- portables */
- UTF);
- if (! valid) {
- RExC_parse = p; /* going to die anyway; point
- to exact spot of failure */
- vFAIL(error_msg);
- }
- ender = result;
-
- if (PL_encoding && ender < 0x100) {
- goto recode_encoding;
- }
- if (ender > 0xff) {
- REQUIRE_UTF8;
- }
- break;
- }
- case 'c':
- p++;
- ender = grok_bslash_c(*p++, SIZE_ONLY);
- break;
- case '8': case '9': /* must be a backreference */
- --p;
- goto loopdone;
- case '1': case '2': case '3':case '4':
- case '5': case '6': case '7':
- /* When we parse backslash escapes there is ambiguity
- * between backreferences and octal escapes. Any escape
- * from \1 - \9 is a backreference, any multi-digit
- * escape which does not start with 0 and which when
- * evaluated as decimal could refer to an already
- * parsed capture buffer is a backslash. Anything else
- * is octal.
- *
- * Note this implies that \118 could be interpreted as
- * 118 OR as "\11" . "8" depending on whether there
- * were 118 capture buffers defined already in the
- * pattern. */
-
- /* NOTE, RExC_npar is 1 more than the actual number of
- * parens we have seen so far, hence the < RExC_npar below. */
-
- if ( !isDIGIT(p[1]) || S_backref_value(p) < RExC_npar)
- { /* Not to be treated as an octal constant, go
- find backref */
- --p;
- goto loopdone;
- }
- /* FALLTHROUGH */
- case '0':
- {
- I32 flags = PERL_SCAN_SILENT_ILLDIGIT;
- STRLEN numlen = 3;
- ender = grok_oct(p, &numlen, &flags, NULL);
- if (ender > 0xff) {
- REQUIRE_UTF8;
- }
- p += numlen;
- if (SIZE_ONLY /* like \08, \178 */
- && numlen < 3
- && p < RExC_end
- && isDIGIT(*p) && ckWARN(WARN_REGEXP))
- {
- reg_warn_non_literal_string(
- p + 1,
- form_short_octal_warning(p, numlen));
- }
- }
- if (PL_encoding && ender < 0x100)
- goto recode_encoding;
- break;
- recode_encoding:
- if (! RExC_override_recoding) {
- SV* enc = PL_encoding;
- ender = reg_recode((const char)(U8)ender, &enc);
- if (!enc && SIZE_ONLY)
- ckWARNreg(p, "Invalid escape in the specified encoding");
- REQUIRE_UTF8;
- }
- break;
- case '\0':
- if (p >= RExC_end)
- FAIL("Trailing \\");
- /* FALLTHROUGH */
- default:
- if (!SIZE_ONLY&& isALPHANUMERIC(*p)) {
- /* Include any { following the alpha to emphasize
- * that it could be part of an escape at some point
- * in the future */
- int len = (isALPHA(*p) && *(p + 1) == '{') ? 2 : 1;
- ckWARN3reg(p + len, "Unrecognized escape \\%.*s passed through", len, p);
- }
- goto normal_default;
- } /* End of switch on '\' */
- break;
- case '{':
- /* Currently we don't warn when the lbrace is at the start
- * of a construct. This catches it in the middle of a
- * literal string, or when its the first thing after
- * something like "\b" */
- if (! SIZE_ONLY
- && (len || (p > RExC_start && isALPHA_A(*(p -1)))))
- {
- ckWARNregdep(p + 1, "Unescaped left brace in regex is deprecated, passed through");
- }
- /*FALLTHROUGH*/
- default: /* A literal character */
- normal_default:
- if (UTF8_IS_START(*p) && UTF) {
- STRLEN numlen;
- ender = utf8n_to_uvchr((U8*)p, RExC_end - p,
- &numlen, UTF8_ALLOW_DEFAULT);
- p += numlen;
- }
- else
- ender = (U8) *p++;
- break;
- } /* End of switch on the literal */
-
- /* Here, have looked at the literal character and <ender>
- * contains its ordinal, <p> points to the character after it
- */
-
- if ( RExC_flags & RXf_PMf_EXTENDED)
- p = regpatws(pRExC_state, p,
- TRUE); /* means recognize comments */
-
- /* If the next thing is a quantifier, it applies to this
- * character only, which means that this character has to be in
- * its own node and can't just be appended to the string in an
- * existing node, so if there are already other characters in
- * the node, close the node with just them, and set up to do
- * this character again next time through, when it will be the
- * only thing in its new node */
- if ((next_is_quantifier = (p < RExC_end && ISMULT2(p))) && len)
- {
- p = oldp;
- goto loopdone;
- }
-
- if (! FOLD /* The simple case, just append the literal */
- || (LOC /* Also don't fold for tricky chars under /l */
- && is_PROBLEMATIC_LOCALE_FOLD_cp(ender)))
- {
- if (UTF) {
- const STRLEN unilen = reguni(pRExC_state, ender, s);
- if (unilen > 0) {
- s += unilen;
- len += unilen;
- }
-
- /* The loop increments <len> each time, as all but this
- * path (and one other) through it add a single byte to
- * the EXACTish node. But this one has changed len to
- * be the correct final value, so subtract one to
- * cancel out the increment that follows */
- len--;
- }
- else {
- REGC((char)ender, s++);
- }
-
- /* Can get here if folding only if is one of the /l
- * characters whose fold depends on the locale. The
- * occurrence of any of these indicate that we can't
- * simplify things */
- if (FOLD) {
- maybe_exact = FALSE;
- maybe_exactfu = FALSE;
- }
- }
- else /* FOLD */
- if (! ( UTF
- /* See comments for join_exact() as to why we fold this
- * non-UTF at compile time */
- || (node_type == EXACTFU
- && ender == LATIN_SMALL_LETTER_SHARP_S)))
- {
- /* Here, are folding and are not UTF-8 encoded; therefore
- * the character must be in the range 0-255, and is not /l
- * (Not /l because we already handled these under /l in
- * is_PROBLEMATIC_LOCALE_FOLD_cp */
- if (IS_IN_SOME_FOLD_L1(ender)) {
- maybe_exact = FALSE;
-
- /* See if the character's fold differs between /d and
- * /u. This includes the multi-char fold SHARP S to
- * 'ss' */
- if (maybe_exactfu
- && (PL_fold[ender] != PL_fold_latin1[ender]
- || ender == LATIN_SMALL_LETTER_SHARP_S
- || (len > 0
- && isARG2_lower_or_UPPER_ARG1('s', ender)
- && isARG2_lower_or_UPPER_ARG1('s',
- *(s-1)))))
- {
- maybe_exactfu = FALSE;
- }
- }
-
- /* Even when folding, we store just the input character, as
- * we have an array that finds its fold quickly */
- *(s++) = (char) ender;
- }
- else { /* FOLD and UTF */
- /* Unlike the non-fold case, we do actually have to
- * calculate the results here in pass 1. This is for two
- * reasons, the folded length may be longer than the
- * unfolded, and we have to calculate how many EXACTish
- * nodes it will take; and we may run out of room in a node
- * in the middle of a potential multi-char fold, and have
- * to back off accordingly. (Hence we can't use REGC for
- * the simple case just below.) */
-
- UV folded;
- if (isASCII(ender)) {
- folded = toFOLD(ender);
- *(s)++ = (U8) folded;
- }
- else {
- STRLEN foldlen;
-
- folded = _to_uni_fold_flags(
- ender,
- (U8 *) s,
- &foldlen,
- FOLD_FLAGS_FULL | ((ASCII_FOLD_RESTRICTED)
- ? FOLD_FLAGS_NOMIX_ASCII
- : 0));
- s += foldlen;
-
- /* The loop increments <len> each time, as all but this
- * path (and one other) through it add a single byte to
- * the EXACTish node. But this one has changed len to
- * be the correct final value, so subtract one to
- * cancel out the increment that follows */
- len += foldlen - 1;
- }
- /* If this node only contains non-folding code points so
- * far, see if this new one is also non-folding */
- if (maybe_exact) {
- if (folded != ender) {
- maybe_exact = FALSE;
- }
- else {
- /* Here the fold is the original; we have to check
- * further to see if anything folds to it */
- if (_invlist_contains_cp(PL_utf8_foldable,
- ender))
- {
- maybe_exact = FALSE;
- }
- }
- }
- ender = folded;
- }
-
- if (next_is_quantifier) {
-
- /* Here, the next input is a quantifier, and to get here,
- * the current character is the only one in the node.
- * Also, here <len> doesn't include the final byte for this
- * character */
- len++;
- goto loopdone;
- }
-
- } /* End of loop through literal characters */
-
- /* Here we have either exhausted the input or ran out of room in
- * the node. (If we encountered a character that can't be in the
- * node, transfer is made directly to <loopdone>, and so we
- * wouldn't have fallen off the end of the loop.) In the latter
- * case, we artificially have to split the node into two, because
- * we just don't have enough space to hold everything. This
- * creates a problem if the final character participates in a
- * multi-character fold in the non-final position, as a match that
- * should have occurred won't, due to the way nodes are matched,
- * and our artificial boundary. So back off until we find a non-
- * problematic character -- one that isn't at the beginning or
- * middle of such a fold. (Either it doesn't participate in any
- * folds, or appears only in the final position of all the folds it
- * does participate in.) A better solution with far fewer false
- * positives, and that would fill the nodes more completely, would
- * be to actually have available all the multi-character folds to
- * test against, and to back-off only far enough to be sure that
- * this node isn't ending with a partial one. <upper_parse> is set
- * further below (if we need to reparse the node) to include just
- * up through that final non-problematic character that this code
- * identifies, so when it is set to less than the full node, we can
- * skip the rest of this */
- if (FOLD && p < RExC_end && upper_parse == MAX_NODE_STRING_SIZE) {
-
- const STRLEN full_len = len;
-
- assert(len >= MAX_NODE_STRING_SIZE);
-
- /* Here, <s> points to the final byte of the final character.
- * Look backwards through the string until find a non-
- * problematic character */
-
- if (! UTF) {
-
- /* This has no multi-char folds to non-UTF characters */
- if (ASCII_FOLD_RESTRICTED) {
- goto loopdone;
- }
-
- while (--s >= s0 && IS_NON_FINAL_FOLD(*s)) { }
- len = s - s0 + 1;
- }
- else {
- if (! PL_NonL1NonFinalFold) {
- PL_NonL1NonFinalFold = _new_invlist_C_array(
- NonL1_Perl_Non_Final_Folds_invlist);
- }
-
- /* Point to the first byte of the final character */
- s = (char *) utf8_hop((U8 *) s, -1);
-
- while (s >= s0) { /* Search backwards until find
- non-problematic char */
- if (UTF8_IS_INVARIANT(*s)) {
-
- /* There are no ascii characters that participate
- * in multi-char folds under /aa. In EBCDIC, the
- * non-ascii invariants are all control characters,
- * so don't ever participate in any folds. */
- if (ASCII_FOLD_RESTRICTED
- || ! IS_NON_FINAL_FOLD(*s))
- {
- break;
- }
- }
- else if (UTF8_IS_DOWNGRADEABLE_START(*s)) {
- if (! IS_NON_FINAL_FOLD(TWO_BYTE_UTF8_TO_NATIVE(
- *s, *(s+1))))
- {
- break;
- }
- }
- else if (! _invlist_contains_cp(
- PL_NonL1NonFinalFold,
- valid_utf8_to_uvchr((U8 *) s, NULL)))
- {
- break;
- }
-
- /* Here, the current character is problematic in that
- * it does occur in the non-final position of some
- * fold, so try the character before it, but have to
- * special case the very first byte in the string, so
- * we don't read outside the string */
- s = (s == s0) ? s -1 : (char *) utf8_hop((U8 *) s, -1);
- } /* End of loop backwards through the string */
-
- /* If there were only problematic characters in the string,
- * <s> will point to before s0, in which case the length
- * should be 0, otherwise include the length of the
- * non-problematic character just found */
- len = (s < s0) ? 0 : s - s0 + UTF8SKIP(s);
- }
-
- /* Here, have found the final character, if any, that is
- * non-problematic as far as ending the node without splitting
- * it across a potential multi-char fold. <len> contains the
- * number of bytes in the node up-to and including that
- * character, or is 0 if there is no such character, meaning
- * the whole node contains only problematic characters. In
- * this case, give up and just take the node as-is. We can't
- * do any better */
- if (len == 0) {
- len = full_len;
-
- /* If the node ends in an 's' we make sure it stays EXACTF,
- * as if it turns into an EXACTFU, it could later get
- * joined with another 's' that would then wrongly match
- * the sharp s */
- if (maybe_exactfu && isARG2_lower_or_UPPER_ARG1('s', ender))
- {
- maybe_exactfu = FALSE;
- }
- } else {
-
- /* Here, the node does contain some characters that aren't
- * problematic. If one such is the final character in the
- * node, we are done */
- if (len == full_len) {
- goto loopdone;
- }
- else if (len + ((UTF) ? UTF8SKIP(s) : 1) == full_len) {
-
- /* If the final character is problematic, but the
- * penultimate is not, back-off that last character to
- * later start a new node with it */
- p = oldp;
- goto loopdone;
- }
-
- /* Here, the final non-problematic character is earlier
- * in the input than the penultimate character. What we do
- * is reparse from the beginning, going up only as far as
- * this final ok one, thus guaranteeing that the node ends
- * in an acceptable character. The reason we reparse is
- * that we know how far in the character is, but we don't
- * know how to correlate its position with the input parse.
- * An alternate implementation would be to build that
- * correlation as we go along during the original parse,
- * but that would entail extra work for every node, whereas
- * this code gets executed only when the string is too
- * large for the node, and the final two characters are
- * problematic, an infrequent occurrence. Yet another
- * possible strategy would be to save the tail of the
- * string, and the next time regatom is called, initialize
- * with that. The problem with this is that unless you
- * back off one more character, you won't be guaranteed
- * regatom will get called again, unless regbranch,
- * regpiece ... are also changed. If you do back off that
- * extra character, so that there is input guaranteed to
- * force calling regatom, you can't handle the case where
- * just the first character in the node is acceptable. I
- * (khw) decided to try this method which doesn't have that
- * pitfall; if performance issues are found, we can do a
- * combination of the current approach plus that one */
- upper_parse = len;
- len = 0;
- s = s0;
- goto reparse;
- }
- } /* End of verifying node ends with an appropriate char */
-
- loopdone: /* Jumped to when encounters something that shouldn't be in
- the node */
-
- /* I (khw) don't know if you can get here with zero length, but the
- * old code handled this situation by creating a zero-length EXACT
- * node. Might as well be NOTHING instead */
- if (len == 0) {
- OP(ret) = NOTHING;
- }
- else {
- if (FOLD) {
- /* If 'maybe_exact' is still set here, means there are no
- * code points in the node that participate in folds;
- * similarly for 'maybe_exactfu' and code points that match
- * differently depending on UTF8ness of the target string
- * (for /u), or depending on locale for /l */
- if (maybe_exact) {
- OP(ret) = EXACT;
- }
- else if (maybe_exactfu) {
- OP(ret) = EXACTFU;
- }
- }
- alloc_maybe_populate_EXACT(pRExC_state, ret, flagp, len, ender,
- FALSE /* Don't look to see if could
- be turned into an EXACT
- node, as we have already
- computed that */
- );
- }
-
- RExC_parse = p - 1;
- Set_Node_Cur_Length(ret, parse_start);
- nextchar(pRExC_state);
- {
- /* len is STRLEN which is unsigned, need to copy to signed */
- IV iv = len;
- if (iv < 0)
- vFAIL("Internal disaster");
- }
-
- } /* End of label 'defchar:' */
- break;
- } /* End of giant switch on input character */
-
- return(ret);
-}
-
-STATIC char *
-S_regpatws(RExC_state_t *pRExC_state, char *p , const bool recognize_comment )
-{
- /* Returns the next non-pattern-white space, non-comment character (the
- * latter only if 'recognize_comment is true) in the string p, which is
- * ended by RExC_end. See also reg_skipcomment */
- const char *e = RExC_end;
-
- PERL_ARGS_ASSERT_REGPATWS;
-
- while (p < e) {
- STRLEN len;
- if ((len = is_PATWS_safe(p, e, UTF))) {
- p += len;
- }
- else if (recognize_comment && *p == '#') {
- p = reg_skipcomment(pRExC_state, p);
- }
- else
- break;
- }
- return p;
-}
-
-STATIC void
-S_populate_ANYOF_from_invlist(pTHX_ regnode *node, SV** invlist_ptr)
-{
- /* Uses the inversion list '*invlist_ptr' to populate the ANYOF 'node'. It
- * sets up the bitmap and any flags, removing those code points from the
- * inversion list, setting it to NULL should it become completely empty */
-
- PERL_ARGS_ASSERT_POPULATE_ANYOF_FROM_INVLIST;
- assert(PL_regkind[OP(node)] == ANYOF);
-
- ANYOF_BITMAP_ZERO(node);
- if (*invlist_ptr) {
-
- /* This gets set if we actually need to modify things */
- bool change_invlist = FALSE;
-
- UV start, end;
-
- /* Start looking through *invlist_ptr */
- invlist_iterinit(*invlist_ptr);
- while (invlist_iternext(*invlist_ptr, &start, &end)) {
- UV high;
- int i;
-
- if (end == UV_MAX && start <= 256) {
- ANYOF_FLAGS(node) |= ANYOF_ABOVE_LATIN1_ALL;
- }
- else if (end >= 256) {
- ANYOF_FLAGS(node) |= ANYOF_UTF8;
- }
-
- /* Quit if are above what we should change */
- if (start > 255) {
- break;
- }
-
- change_invlist = TRUE;
-
- /* Set all the bits in the range, up to the max that we are doing */
- high = (end < 255) ? end : 255;
- for (i = start; i <= (int) high; i++) {
- if (! ANYOF_BITMAP_TEST(node, i)) {
- ANYOF_BITMAP_SET(node, i);
- }
- }
- }
- invlist_iterfinish(*invlist_ptr);
-
- /* Done with loop; remove any code points that are in the bitmap from
- * *invlist_ptr; similarly for code points above latin1 if we have a
- * flag to match all of them anyways */
- if (change_invlist) {
- _invlist_subtract(*invlist_ptr, PL_Latin1, invlist_ptr);
- }
- if (ANYOF_FLAGS(node) & ANYOF_ABOVE_LATIN1_ALL) {
- _invlist_intersection(*invlist_ptr, PL_Latin1, invlist_ptr);
- }
-
- /* If have completely emptied it, remove it completely */
- if (_invlist_len(*invlist_ptr) == 0) {
- SvREFCNT_dec_NN(*invlist_ptr);
- *invlist_ptr = NULL;
- }
- }
-}
-
-/* Parse POSIX character classes: [[:foo:]], [[=foo=]], [[.foo.]].
- Character classes ([:foo:]) can also be negated ([:^foo:]).
- Returns a named class id (ANYOF_XXX) if successful, -1 otherwise.
- Equivalence classes ([=foo=]) and composites ([.foo.]) are parsed,
- but trigger failures because they are currently unimplemented. */
-
-#define POSIXCC_DONE(c) ((c) == ':')
-#define POSIXCC_NOTYET(c) ((c) == '=' || (c) == '.')
-#define POSIXCC(c) (POSIXCC_DONE(c) || POSIXCC_NOTYET(c))
-
-PERL_STATIC_INLINE I32
-S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value, const bool strict)
-{
- I32 namedclass = OOB_NAMEDCLASS;
-
- PERL_ARGS_ASSERT_REGPPOSIXCC;
-
- if (value == '[' && RExC_parse + 1 < RExC_end &&
- /* I smell either [: or [= or [. -- POSIX has been here, right? */
- POSIXCC(UCHARAT(RExC_parse)))
- {
- const char c = UCHARAT(RExC_parse);
- char* const s = RExC_parse++;
-
- while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != c)
- RExC_parse++;
- if (RExC_parse == RExC_end) {
- if (strict) {
-
- /* Try to give a better location for the error (than the end of
- * the string) by looking for the matching ']' */
- RExC_parse = s;
- while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != ']') {
- RExC_parse++;
- }
- vFAIL2("Unmatched '%c' in POSIX class", c);
- }
- /* Grandfather lone [:, [=, [. */
- RExC_parse = s;
- }
- else {
- const char* const t = RExC_parse++; /* skip over the c */
- assert(*t == c);
-
- if (UCHARAT(RExC_parse) == ']') {
- const char *posixcc = s + 1;
- RExC_parse++; /* skip over the ending ] */
-
- if (*s == ':') {
- const I32 complement = *posixcc == '^' ? *posixcc++ : 0;
- const I32 skip = t - posixcc;
-
- /* Initially switch on the length of the name. */
- switch (skip) {
- case 4:
- if (memEQ(posixcc, "word", 4)) /* this is not POSIX,
- this is the Perl \w
- */
- namedclass = ANYOF_WORDCHAR;
- break;
- case 5:
- /* Names all of length 5. */
- /* alnum alpha ascii blank cntrl digit graph lower
- print punct space upper */
- /* Offset 4 gives the best switch position. */
- switch (posixcc[4]) {
- case 'a':
- if (memEQ(posixcc, "alph", 4)) /* alpha */
- namedclass = ANYOF_ALPHA;
- break;
- case 'e':
- if (memEQ(posixcc, "spac", 4)) /* space */
- namedclass = ANYOF_PSXSPC;
- break;
- case 'h':
- if (memEQ(posixcc, "grap", 4)) /* graph */
- namedclass = ANYOF_GRAPH;
- break;
- case 'i':
- if (memEQ(posixcc, "asci", 4)) /* ascii */
- namedclass = ANYOF_ASCII;
- break;
- case 'k':
- if (memEQ(posixcc, "blan", 4)) /* blank */
- namedclass = ANYOF_BLANK;
- break;
- case 'l':
- if (memEQ(posixcc, "cntr", 4)) /* cntrl */
- namedclass = ANYOF_CNTRL;
- break;
- case 'm':
- if (memEQ(posixcc, "alnu", 4)) /* alnum */
- namedclass = ANYOF_ALPHANUMERIC;
- break;
- case 'r':
- if (memEQ(posixcc, "lowe", 4)) /* lower */
- namedclass = (FOLD) ? ANYOF_CASED : ANYOF_LOWER;
- else if (memEQ(posixcc, "uppe", 4)) /* upper */
- namedclass = (FOLD) ? ANYOF_CASED : ANYOF_UPPER;
- break;
- case 't':
- if (memEQ(posixcc, "digi", 4)) /* digit */
- namedclass = ANYOF_DIGIT;
- else if (memEQ(posixcc, "prin", 4)) /* print */
- namedclass = ANYOF_PRINT;
- else if (memEQ(posixcc, "punc", 4)) /* punct */
- namedclass = ANYOF_PUNCT;
- break;
- }
- break;
- case 6:
- if (memEQ(posixcc, "xdigit", 6))
- namedclass = ANYOF_XDIGIT;
- break;
- }
-
- if (namedclass == OOB_NAMEDCLASS)
- vFAIL2utf8f(
- "POSIX class [:%"UTF8f":] unknown",
- UTF8fARG(UTF, t - s - 1, s + 1));
-
- /* The #defines are structured so each complement is +1 to
- * the normal one */
- if (complement) {
- namedclass++;
- }
- assert (posixcc[skip] == ':');
- assert (posixcc[skip+1] == ']');
- } else if (!SIZE_ONLY) {
- /* [[=foo=]] and [[.foo.]] are still future. */
-
- /* adjust RExC_parse so the warning shows after
- the class closes */
- while (UCHARAT(RExC_parse) && UCHARAT(RExC_parse) != ']')
- RExC_parse++;
- vFAIL3("POSIX syntax [%c %c] is reserved for future extensions", c, c);
- }
- } else {
- /* Maternal grandfather:
- * "[:" ending in ":" but not in ":]" */
- if (strict) {
- vFAIL("Unmatched '[' in POSIX class");
- }
-
- /* Grandfather lone [:, [=, [. */
- RExC_parse = s;
- }
- }
- }
-
- return namedclass;
-}
-
-STATIC bool
-S_could_it_be_a_POSIX_class(RExC_state_t *pRExC_state)
-{
- /* This applies some heuristics at the current parse position (which should
- * be at a '[') to see if what follows might be intended to be a [:posix:]
- * class. It returns true if it really is a posix class, of course, but it
- * also can return true if it thinks that what was intended was a posix
- * class that didn't quite make it.
- *
- * It will return true for
- * [:alphanumerics:
- * [:alphanumerics] (as long as the ] isn't followed immediately by a
- * ')' indicating the end of the (?[
- * [:any garbage including %^&$ punctuation:]
- *
- * This is designed to be called only from S_handle_regex_sets; it could be
- * easily adapted to be called from the spot at the beginning of regclass()
- * that checks to see in a normal bracketed class if the surrounding []
- * have been omitted ([:word:] instead of [[:word:]]). But doing so would
- * change long-standing behavior, so I (khw) didn't do that */
- char* p = RExC_parse + 1;
- char first_char = *p;
-
- PERL_ARGS_ASSERT_COULD_IT_BE_A_POSIX_CLASS;
-
- assert(*(p - 1) == '[');
-
- if (! POSIXCC(first_char)) {
- return FALSE;
- }
-
- p++;
- while (p < RExC_end && isWORDCHAR(*p)) p++;
-
- if (p >= RExC_end) {
- return FALSE;
- }
-
- if (p - RExC_parse > 2 /* Got at least 1 word character */
- && (*p == first_char
- || (*p == ']' && p + 1 < RExC_end && *(p + 1) != ')')))
- {
- return TRUE;
- }
-
- p = (char *) memchr(RExC_parse, ']', RExC_end - RExC_parse);
-
- return (p
- && p - RExC_parse > 2 /* [:] evaluates to colon;
- [::] is a bad posix class. */
- && first_char == *(p - 1));
-}
-
-STATIC regnode *
-S_handle_regex_sets(pTHX_ RExC_state_t *pRExC_state, SV** return_invlist,
- I32 *flagp, U32 depth,
- char * const oregcomp_parse)
-{
- /* Handle the (?[...]) construct to do set operations */
-
- U8 curchar;
- UV start, end; /* End points of code point ranges */
- SV* result_string;
- char *save_end, *save_parse;
- SV* final;
- STRLEN len;
- regnode* node;
- AV* stack;
- const bool save_fold = FOLD;
-
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_HANDLE_REGEX_SETS;
-
- if (LOC) {
- vFAIL("(?[...]) not valid in locale");
- }
- RExC_uni_semantics = 1;
-
- /* This will return only an ANYOF regnode, or (unlikely) something smaller
- * (such as EXACT). Thus we can skip most everything if just sizing. We
- * call regclass to handle '[]' so as to not have to reinvent its parsing
- * rules here (throwing away the size it computes each time). And, we exit
- * upon an unescaped ']' that isn't one ending a regclass. To do both
- * these things, we need to realize that something preceded by a backslash
- * is escaped, so we have to keep track of backslashes */
- if (SIZE_ONLY) {
- UV depth = 0; /* how many nested (?[...]) constructs */
-
- Perl_ck_warner_d(aTHX_
- packWARN(WARN_EXPERIMENTAL__REGEX_SETS),
- "The regex_sets feature is experimental" REPORT_LOCATION,
- UTF8fARG(UTF, (RExC_parse - RExC_precomp), RExC_precomp),
- UTF8fARG(UTF,
- RExC_end - RExC_start - (RExC_parse - RExC_precomp),
- RExC_precomp + (RExC_parse - RExC_precomp)));
-
- while (RExC_parse < RExC_end) {
- SV* current = NULL;
- RExC_parse = regpatws(pRExC_state, RExC_parse,
- TRUE); /* means recognize comments */
- switch (*RExC_parse) {
- case '?':
- if (RExC_parse[1] == '[') depth++, RExC_parse++;
- /* FALLTHROUGH */
- default:
- break;
- case '\\':
- /* Skip the next byte (which could cause us to end up in
- * the middle of a UTF-8 character, but since none of those
- * are confusable with anything we currently handle in this
- * switch (invariants all), it's safe. We'll just hit the
- * default: case next time and keep on incrementing until
- * we find one of the invariants we do handle. */
- RExC_parse++;
- break;
- case '[':
- {
- /* If this looks like it is a [:posix:] class, leave the
- * parse pointer at the '[' to fool regclass() into
- * thinking it is part of a '[[:posix:]]'. That function
- * will use strict checking to force a syntax error if it
- * doesn't work out to a legitimate class */
- bool is_posix_class
- = could_it_be_a_POSIX_class(pRExC_state);
- if (! is_posix_class) {
- RExC_parse++;
- }
-
- /* regclass() can only return RESTART_UTF8 if multi-char
- folds are allowed. */
- if (!regclass(pRExC_state, flagp,depth+1,
- is_posix_class, /* parse the whole char
- class only if not a
- posix class */
- FALSE, /* don't allow multi-char folds */
- TRUE, /* silence non-portable warnings. */
- ¤t))
- FAIL2("panic: regclass returned NULL to handle_sets, flags=%#"UVxf"",
- (UV) *flagp);
-
- /* function call leaves parse pointing to the ']', except
- * if we faked it */
- if (is_posix_class) {
- RExC_parse--;
- }
-
- SvREFCNT_dec(current); /* In case it returned something */
- break;
- }
-
- case ']':
- if (depth--) break;
- RExC_parse++;
- if (RExC_parse < RExC_end
- && *RExC_parse == ')')
- {
- node = reganode(pRExC_state, ANYOF, 0);
- RExC_size += ANYOF_SKIP;
- nextchar(pRExC_state);
- Set_Node_Length(node,
- RExC_parse - oregcomp_parse + 1); /* MJD */
- return node;
- }
- goto no_close;
- }
- RExC_parse++;
- }
-
- no_close:
- FAIL("Syntax error in (?[...])");
- }
-
- /* Pass 2 only after this. Everything in this construct is a
- * metacharacter. Operands begin with either a '\' (for an escape
- * sequence), or a '[' for a bracketed character class. Any other
- * character should be an operator, or parenthesis for grouping. Both
- * types of operands are handled by calling regclass() to parse them. It
- * is called with a parameter to indicate to return the computed inversion
- * list. The parsing here is implemented via a stack. Each entry on the
- * stack is a single character representing one of the operators, or the
- * '('; or else a pointer to an operand inversion list. */
-
-#define IS_OPERAND(a) (! SvIOK(a))
-
- /* The stack starts empty. It is a syntax error if the first thing parsed
- * is a binary operator; everything else is pushed on the stack. When an
- * operand is parsed, the top of the stack is examined. If it is a binary
- * operator, the item before it should be an operand, and both are replaced
- * by the result of doing that operation on the new operand and the one on
- * the stack. Thus a sequence of binary operands is reduced to a single
- * one before the next one is parsed.
- *
- * A unary operator may immediately follow a binary in the input, for
- * example
- * [a] + ! [b]
- * When an operand is parsed and the top of the stack is a unary operator,
- * the operation is performed, and then the stack is rechecked to see if
- * this new operand is part of a binary operation; if so, it is handled as
- * above.
- *
- * A '(' is simply pushed on the stack; it is valid only if the stack is
- * empty, or the top element of the stack is an operator or another '('
- * (for which the parenthesized expression will become an operand). By the
- * time the corresponding ')' is parsed everything in between should have
- * been parsed and evaluated to a single operand (or else is a syntax
- * error), and is handled as a regular operand */
-
- sv_2mortal((SV *)(stack = newAV()));
-
- while (RExC_parse < RExC_end) {
- I32 top_index = av_tindex(stack);
- SV** top_ptr;
- SV* current = NULL;
-
- /* Skip white space */
- RExC_parse = regpatws(pRExC_state, RExC_parse,
- TRUE /* means recognize comments */ );
- if (RExC_parse >= RExC_end) {
- Perl_croak(aTHX_ "panic: Read past end of '(?[ ])'");
- }
- if ((curchar = UCHARAT(RExC_parse)) == ']') {
- break;
- }
-
- switch (curchar) {
-
- case '?':
- if (av_tindex(stack) >= 0 /* This makes sure that we can
- safely subtract 1 from
- RExC_parse in the next clause.
- If we have something on the
- stack, we have parsed something
- */
- && UCHARAT(RExC_parse - 1) == '('
- && RExC_parse < RExC_end)
- {
- /* If is a '(?', could be an embedded '(?flags:(?[...])'.
- * This happens when we have some thing like
- *
- * my $thai_or_lao = qr/(?[ \p{Thai} + \p{Lao} ])/;
- * ...
- * qr/(?[ \p{Digit} & $thai_or_lao ])/;
- *
- * Here we would be handling the interpolated
- * '$thai_or_lao'. We handle this by a recursive call to
- * ourselves which returns the inversion list the
- * interpolated expression evaluates to. We use the flags
- * from the interpolated pattern. */
- U32 save_flags = RExC_flags;
- const char * const save_parse = ++RExC_parse;
-
- parse_lparen_question_flags(pRExC_state);
-
- if (RExC_parse == save_parse /* Makes sure there was at
- least one flag (or this
- embedding wasn't compiled)
- */
- || RExC_parse >= RExC_end - 4
- || UCHARAT(RExC_parse) != ':'
- || UCHARAT(++RExC_parse) != '('
- || UCHARAT(++RExC_parse) != '?'
- || UCHARAT(++RExC_parse) != '[')
- {
-
- /* In combination with the above, this moves the
- * pointer to the point just after the first erroneous
- * character (or if there are no flags, to where they
- * should have been) */
- if (RExC_parse >= RExC_end - 4) {
- RExC_parse = RExC_end;
- }
- else if (RExC_parse != save_parse) {
- RExC_parse += (UTF) ? UTF8SKIP(RExC_parse) : 1;
- }
- vFAIL("Expecting '(?flags:(?[...'");
- }
- RExC_parse++;
- (void) handle_regex_sets(pRExC_state, ¤t, flagp,
- depth+1, oregcomp_parse);
-
- /* Here, 'current' contains the embedded expression's
- * inversion list, and RExC_parse points to the trailing
- * ']'; the next character should be the ')' which will be
- * paired with the '(' that has been put on the stack, so
- * the whole embedded expression reduces to '(operand)' */
- RExC_parse++;
-
- RExC_flags = save_flags;
- goto handle_operand;
- }
- /* FALLTHROUGH */
-
- default:
- RExC_parse += (UTF) ? UTF8SKIP(RExC_parse) : 1;
- vFAIL("Unexpected character");
-
- case '\\':
- /* regclass() can only return RESTART_UTF8 if multi-char
- folds are allowed. */
- if (!regclass(pRExC_state, flagp,depth+1,
- TRUE, /* means parse just the next thing */
- FALSE, /* don't allow multi-char folds */
- FALSE, /* don't silence non-portable warnings. */
- ¤t))
- FAIL2("panic: regclass returned NULL to handle_sets, flags=%#"UVxf"",
- (UV) *flagp);
- /* regclass() will return with parsing just the \ sequence,
- * leaving the parse pointer at the next thing to parse */
- RExC_parse--;
- goto handle_operand;
-
- case '[': /* Is a bracketed character class */
- {
- bool is_posix_class = could_it_be_a_POSIX_class(pRExC_state);
-
- if (! is_posix_class) {
- RExC_parse++;
- }
-
- /* regclass() can only return RESTART_UTF8 if multi-char
- folds are allowed. */
- if(!regclass(pRExC_state, flagp,depth+1,
- is_posix_class, /* parse the whole char class
- only if not a posix class */
- FALSE, /* don't allow multi-char folds */
- FALSE, /* don't silence non-portable warnings. */
- ¤t))
- FAIL2("panic: regclass returned NULL to handle_sets, flags=%#"UVxf"",
- (UV) *flagp);
- /* function call leaves parse pointing to the ']', except if we
- * faked it */
- if (is_posix_class) {
- RExC_parse--;
- }
-
- goto handle_operand;
- }
-
- case '&':
- case '|':
- case '+':
- case '-':
- case '^':
- if (top_index < 0
- || ( ! (top_ptr = av_fetch(stack, top_index, FALSE)))
- || ! IS_OPERAND(*top_ptr))
- {
- RExC_parse++;
- vFAIL2("Unexpected binary operator '%c' with no preceding operand", curchar);
- }
- av_push(stack, newSVuv(curchar));
- break;
-
- case '!':
- av_push(stack, newSVuv(curchar));
- break;
-
- case '(':
- if (top_index >= 0) {
- top_ptr = av_fetch(stack, top_index, FALSE);
- assert(top_ptr);
- if (IS_OPERAND(*top_ptr)) {
- RExC_parse++;
- vFAIL("Unexpected '(' with no preceding operator");
- }
- }
- av_push(stack, newSVuv(curchar));
- break;
-
- case ')':
- {
- SV* lparen;
- if (top_index < 1
- || ! (current = av_pop(stack))
- || ! IS_OPERAND(current)
- || ! (lparen = av_pop(stack))
- || IS_OPERAND(lparen)
- || SvUV(lparen) != '(')
- {
- SvREFCNT_dec(current);
- RExC_parse++;
- vFAIL("Unexpected ')'");
- }
- top_index -= 2;
- SvREFCNT_dec_NN(lparen);
-
- /* FALLTHROUGH */
- }
-
- handle_operand:
-
- /* Here, we have an operand to process, in 'current' */
-
- if (top_index < 0) { /* Just push if stack is empty */
- av_push(stack, current);
- }
- else {
- SV* top = av_pop(stack);
- SV *prev = NULL;
- char current_operator;
-
- if (IS_OPERAND(top)) {
- SvREFCNT_dec_NN(top);
- SvREFCNT_dec_NN(current);
- vFAIL("Operand with no preceding operator");
- }
- current_operator = (char) SvUV(top);
- switch (current_operator) {
- case '(': /* Push the '(' back on followed by the new
- operand */
- av_push(stack, top);
- av_push(stack, current);
- SvREFCNT_inc(top); /* Counters the '_dec' done
- just after the 'break', so
- it doesn't get wrongly freed
- */
- break;
-
- case '!':
- _invlist_invert(current);
-
- /* Unlike binary operators, the top of the stack,
- * now that this unary one has been popped off, may
- * legally be an operator, and we now have operand
- * for it. */
- top_index--;
- SvREFCNT_dec_NN(top);
- goto handle_operand;
-
- case '&':
- prev = av_pop(stack);
- _invlist_intersection(prev,
- current,
- ¤t);
- av_push(stack, current);
- break;
-
- case '|':
- case '+':
- prev = av_pop(stack);
- _invlist_union(prev, current, ¤t);
- av_push(stack, current);
- break;
-
- case '-':
- prev = av_pop(stack);;
- _invlist_subtract(prev, current, ¤t);
- av_push(stack, current);
- break;
-
- case '^': /* The union minus the intersection */
- {
- SV* i = NULL;
- SV* u = NULL;
- SV* element;
-
- prev = av_pop(stack);
- _invlist_union(prev, current, &u);
- _invlist_intersection(prev, current, &i);
- /* _invlist_subtract will overwrite current
- without freeing what it already contains */
- element = current;
- _invlist_subtract(u, i, ¤t);
- av_push(stack, current);
- SvREFCNT_dec_NN(i);
- SvREFCNT_dec_NN(u);
- SvREFCNT_dec_NN(element);
- break;
- }
-
- default:
- Perl_croak(aTHX_ "panic: Unexpected item on '(?[ ])' stack");
- }
- SvREFCNT_dec_NN(top);
- SvREFCNT_dec(prev);
- }
- }
-
- RExC_parse += (UTF) ? UTF8SKIP(RExC_parse) : 1;
- }
-
- if (av_tindex(stack) < 0 /* Was empty */
- || ((final = av_pop(stack)) == NULL)
- || ! IS_OPERAND(final)
- || av_tindex(stack) >= 0) /* More left on stack */
- {
- vFAIL("Incomplete expression within '(?[ ])'");
- }
-
- /* Here, 'final' is the resultant inversion list from evaluating the
- * expression. Return it if so requested */
- if (return_invlist) {
- *return_invlist = final;
- return END;
- }
-
- /* Otherwise generate a resultant node, based on 'final'. regclass() is
- * expecting a string of ranges and individual code points */
- invlist_iterinit(final);
- result_string = newSVpvs("");
- while (invlist_iternext(final, &start, &end)) {
- if (start == end) {
- Perl_sv_catpvf(aTHX_ result_string, "\\x{%"UVXf"}", start);
- }
- else {
- Perl_sv_catpvf(aTHX_ result_string, "\\x{%"UVXf"}-\\x{%"UVXf"}",
- start, end);
- }
- }
-
- save_parse = RExC_parse;
- RExC_parse = SvPV(result_string, len);
- save_end = RExC_end;
- RExC_end = RExC_parse + len;
-
- /* We turn off folding around the call, as the class we have constructed
- * already has all folding taken into consideration, and we don't want
- * regclass() to add to that */
- RExC_flags &= ~RXf_PMf_FOLD;
- /* regclass() can only return RESTART_UTF8 if multi-char folds are allowed.
- */
- node = regclass(pRExC_state, flagp,depth+1,
- FALSE, /* means parse the whole char class */
- FALSE, /* don't allow multi-char folds */
- TRUE, /* silence non-portable warnings. The above may very
- well have generated non-portable code points, but
- they're valid on this machine */
- NULL);
- if (!node)
- FAIL2("panic: regclass returned NULL to handle_sets, flags=%#"UVxf,
- PTR2UV(flagp));
- if (save_fold) {
- RExC_flags |= RXf_PMf_FOLD;
- }
- RExC_parse = save_parse + 1;
- RExC_end = save_end;
- SvREFCNT_dec_NN(final);
- SvREFCNT_dec_NN(result_string);
-
- nextchar(pRExC_state);
- Set_Node_Length(node, RExC_parse - oregcomp_parse + 1); /* MJD */
- return node;
-}
-#undef IS_OPERAND
-
-STATIC void
-S_add_above_Latin1_folds(pTHX_ RExC_state_t *pRExC_state, const U8 cp, SV** invlist)
-{
- /* This hard-codes the Latin1/above-Latin1 folding rules, so that an
- * innocent-looking character class, like /[ks]/i won't have to go out to
- * disk to find the possible matches.
- *
- * This should be called only for a Latin1-range code points, cp, which is
- * known to be involved in a simple fold with other code points above
- * Latin1. It would give false results if /aa has been specified.
- * Multi-char folds are outside the scope of this, and must be handled
- * specially.
- *
- * XXX It would be better to generate these via regen, in case a new
- * version of the Unicode standard adds new mappings, though that is not
- * really likely, and may be caught by the default: case of the switch
- * below. */
-
- PERL_ARGS_ASSERT_ADD_ABOVE_LATIN1_FOLDS;
-
- assert(HAS_NONLATIN1_SIMPLE_FOLD_CLOSURE(cp));
-
- switch (cp) {
- case 'k':
- case 'K':
- *invlist =
- add_cp_to_invlist(*invlist, KELVIN_SIGN);
- break;
- case 's':
- case 'S':
- *invlist = add_cp_to_invlist(*invlist, LATIN_SMALL_LETTER_LONG_S);
- break;
- case MICRO_SIGN:
- *invlist = add_cp_to_invlist(*invlist, GREEK_CAPITAL_LETTER_MU);
- *invlist = add_cp_to_invlist(*invlist, GREEK_SMALL_LETTER_MU);
- break;
- case LATIN_CAPITAL_LETTER_A_WITH_RING_ABOVE:
- case LATIN_SMALL_LETTER_A_WITH_RING_ABOVE:
- *invlist = add_cp_to_invlist(*invlist, ANGSTROM_SIGN);
- break;
- case LATIN_SMALL_LETTER_Y_WITH_DIAERESIS:
- *invlist = add_cp_to_invlist(*invlist,
- LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS);
- break;
- case LATIN_SMALL_LETTER_SHARP_S:
- *invlist = add_cp_to_invlist(*invlist, LATIN_CAPITAL_LETTER_SHARP_S);
- break;
- default:
- /* Use deprecated warning to increase the chances of this being
- * output */
- ckWARN2reg_d(RExC_parse, "Perl folding rules are not up-to-date for 0x%02X; please use the perlbug utility to report;", cp);
- break;
- }
-}
-
-/* The names of properties whose definitions are not known at compile time are
- * stored in this SV, after a constant heading. So if the length has been
- * changed since initialization, then there is a run-time definition. */
-#define HAS_NONLOCALE_RUNTIME_PROPERTY_DEFINITION \
- (SvCUR(listsv) != initial_listsv_len)
-
-STATIC regnode *
-S_regclass(pTHX_ RExC_state_t *pRExC_state, I32 *flagp, U32 depth,
- const bool stop_at_1, /* Just parse the next thing, don't
- look for a full character class */
- bool allow_multi_folds,
- const bool silence_non_portable, /* Don't output warnings
- about too large
- characters */
- SV** ret_invlist) /* Return an inversion list, not a node */
-{
- /* parse a bracketed class specification. Most of these will produce an
- * ANYOF node; but something like [a] will produce an EXACT node; [aA], an
- * EXACTFish node; [[:ascii:]], a POSIXA node; etc. It is more complex
- * under /i with multi-character folds: it will be rewritten following the
- * paradigm of this example, where the <multi-fold>s are characters which
- * fold to multiple character sequences:
- * /[abc\x{multi-fold1}def\x{multi-fold2}ghi]/i
- * gets effectively rewritten as:
- * /(?:\x{multi-fold1}|\x{multi-fold2}|[abcdefghi]/i
- * reg() gets called (recursively) on the rewritten version, and this
- * function will return what it constructs. (Actually the <multi-fold>s
- * aren't physically removed from the [abcdefghi], it's just that they are
- * ignored in the recursion by means of a flag:
- * <RExC_in_multi_char_class>.)
- *
- * ANYOF nodes contain a bit map for the first 256 characters, with the
- * corresponding bit set if that character is in the list. For characters
- * above 255, a range list or swash is used. There are extra bits for \w,
- * etc. in locale ANYOFs, as what these match is not determinable at
- * compile time
- *
- * Returns NULL, setting *flagp to RESTART_UTF8 if the sizing scan needs
- * to be restarted. This can only happen if ret_invlist is non-NULL.
- */
-
- UV prevvalue = OOB_UNICODE, save_prevvalue = OOB_UNICODE;
- IV range = 0;
- UV value = OOB_UNICODE, save_value = OOB_UNICODE;
- regnode *ret;
- STRLEN numlen;
- IV namedclass = OOB_NAMEDCLASS;
- char *rangebegin = NULL;
- bool need_class = 0;
- SV *listsv = NULL;
- STRLEN initial_listsv_len = 0; /* Kind of a kludge to see if it is more
- than just initialized. */
- SV* properties = NULL; /* Code points that match \p{} \P{} */
- SV* posixes = NULL; /* Code points that match classes like [:word:],
- extended beyond the Latin1 range. These have to
- be kept separate from other code points for much
- of this function because their handling is
- different under /i, and for most classes under
- /d as well */
- SV* nposixes = NULL; /* Similarly for [:^word:]. These are kept
- separate for a while from the non-complemented
- versions because of complications with /d
- matching */
- UV element_count = 0; /* Number of distinct elements in the class.
- Optimizations may be possible if this is tiny */
- AV * multi_char_matches = NULL; /* Code points that fold to more than one
- character; used under /i */
- UV n;
- char * stop_ptr = RExC_end; /* where to stop parsing */
- const bool skip_white = cBOOL(ret_invlist); /* ignore unescaped white
- space? */
- const bool strict = cBOOL(ret_invlist); /* Apply strict parsing rules? */
-
- /* Unicode properties are stored in a swash; this holds the current one
- * being parsed. If this swash is the only above-latin1 component of the
- * character class, an optimization is to pass it directly on to the
- * execution engine. Otherwise, it is set to NULL to indicate that there
- * are other things in the class that have to be dealt with at execution
- * time */
- SV* swash = NULL; /* Code points that match \p{} \P{} */
-
- /* Set if a component of this character class is user-defined; just passed
- * on to the engine */
- bool has_user_defined_property = FALSE;
-
- /* inversion list of code points this node matches only when the target
- * string is in UTF-8. (Because is under /d) */
- SV* depends_list = NULL;
-
- /* Inversion list of code points this node matches regardless of things
- * like locale, folding, utf8ness of the target string */
- SV* cp_list = NULL;
-
- /* Like cp_list, but code points on this list need to be checked for things
- * that fold to/from them under /i */
- SV* cp_foldable_list = NULL;
-
- /* Like cp_list, but code points on this list are valid only when the
- * runtime locale is UTF-8 */
- SV* only_utf8_locale_list = NULL;
-
-#ifdef EBCDIC
- /* In a range, counts how many 0-2 of the ends of it came from literals,
- * not escapes. Thus we can tell if 'A' was input vs \x{C1} */
- UV literal_endpoint = 0;
-#endif
- bool invert = FALSE; /* Is this class to be complemented */
-
- bool warn_super = ALWAYS_WARN_SUPER;
-
- regnode * const orig_emit = RExC_emit; /* Save the original RExC_emit in
- case we need to change the emitted regop to an EXACT. */
- const char * orig_parse = RExC_parse;
- const SSize_t orig_size = RExC_size;
- bool posixl_matches_all = FALSE; /* Does /l class have both e.g. \W,\w ? */
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGCLASS;
-#ifndef DEBUGGING
- PERL_UNUSED_ARG(depth);
-#endif
-
- DEBUG_PARSE("clas");
-
- /* Assume we are going to generate an ANYOF node. */
- ret = reganode(pRExC_state, ANYOF, 0);
-
- if (SIZE_ONLY) {
- RExC_size += ANYOF_SKIP;
- listsv = &PL_sv_undef; /* For code scanners: listsv always non-NULL. */
- }
- else {
- ANYOF_FLAGS(ret) = 0;
-
- RExC_emit += ANYOF_SKIP;
- listsv = newSVpvs_flags("# comment\n", SVs_TEMP);
- initial_listsv_len = SvCUR(listsv);
- SvTEMP_off(listsv); /* Grr, TEMPs and mortals are conflated. */
- }
-
- if (skip_white) {
- RExC_parse = regpatws(pRExC_state, RExC_parse,
- FALSE /* means don't recognize comments */ );
- }
-
- if (UCHARAT(RExC_parse) == '^') { /* Complement of range. */
- RExC_parse++;
- invert = TRUE;
- allow_multi_folds = FALSE;
- RExC_naughty++;
- if (skip_white) {
- RExC_parse = regpatws(pRExC_state, RExC_parse,
- FALSE /* means don't recognize comments */ );
- }
- }
-
- /* Check that they didn't say [:posix:] instead of [[:posix:]] */
- if (!SIZE_ONLY && RExC_parse < RExC_end && POSIXCC(UCHARAT(RExC_parse))) {
- const char *s = RExC_parse;
- const char c = *s++;
-
- while (isWORDCHAR(*s))
- s++;
- if (*s && c == *s && s[1] == ']') {
- SAVEFREESV(RExC_rx_sv);
- ckWARN3reg(s+2,
- "POSIX syntax [%c %c] belongs inside character classes",
- c, c);
- (void)ReREFCNT_inc(RExC_rx_sv);
- }
- }
-
- /* If the caller wants us to just parse a single element, accomplish this
- * by faking the loop ending condition */
- if (stop_at_1 && RExC_end > RExC_parse) {
- stop_ptr = RExC_parse + 1;
- }
-
- /* allow 1st char to be ']' (allowing it to be '-' is dealt with later) */
- if (UCHARAT(RExC_parse) == ']')
- goto charclassloop;
-
-parseit:
- while (1) {
- if (RExC_parse >= stop_ptr) {
- break;
- }
-
- if (skip_white) {
- RExC_parse = regpatws(pRExC_state, RExC_parse,
- FALSE /* means don't recognize comments */ );
- }
-
- if (UCHARAT(RExC_parse) == ']') {
- break;
- }
-
- charclassloop:
-
- namedclass = OOB_NAMEDCLASS; /* initialize as illegal */
- save_value = value;
- save_prevvalue = prevvalue;
-
- if (!range) {
- rangebegin = RExC_parse;
- element_count++;
- }
- if (UTF) {
- value = utf8n_to_uvchr((U8*)RExC_parse,
- RExC_end - RExC_parse,
- &numlen, UTF8_ALLOW_DEFAULT);
- RExC_parse += numlen;
- }
- else
- value = UCHARAT(RExC_parse++);
-
- if (value == '['
- && RExC_parse < RExC_end
- && POSIXCC(UCHARAT(RExC_parse)))
- {
- namedclass = regpposixcc(pRExC_state, value, strict);
- }
- else if (value == '\\') {
- if (UTF) {
- value = utf8n_to_uvchr((U8*)RExC_parse,
- RExC_end - RExC_parse,
- &numlen, UTF8_ALLOW_DEFAULT);
- RExC_parse += numlen;
- }
- else
- value = UCHARAT(RExC_parse++);
-
- /* Some compilers cannot handle switching on 64-bit integer
- * values, therefore value cannot be an UV. Yes, this will
- * be a problem later if we want switch on Unicode.
- * A similar issue a little bit later when switching on
- * namedclass. --jhi */
-
- /* If the \ is escaping white space when white space is being
- * skipped, it means that that white space is wanted literally, and
- * is already in 'value'. Otherwise, need to translate the escape
- * into what it signifies. */
- if (! skip_white || ! is_PATWS_cp(value)) switch ((I32)value) {
-
- case 'w': namedclass = ANYOF_WORDCHAR; break;
- case 'W': namedclass = ANYOF_NWORDCHAR; break;
- case 's': namedclass = ANYOF_SPACE; break;
- case 'S': namedclass = ANYOF_NSPACE; break;
- case 'd': namedclass = ANYOF_DIGIT; break;
- case 'D': namedclass = ANYOF_NDIGIT; break;
- case 'v': namedclass = ANYOF_VERTWS; break;
- case 'V': namedclass = ANYOF_NVERTWS; break;
- case 'h': namedclass = ANYOF_HORIZWS; break;
- case 'H': namedclass = ANYOF_NHORIZWS; break;
- case 'N': /* Handle \N{NAME} in class */
- {
- /* We only pay attention to the first char of
- multichar strings being returned. I kinda wonder
- if this makes sense as it does change the behaviour
- from earlier versions, OTOH that behaviour was broken
- as well. */
- if (! grok_bslash_N(pRExC_state, NULL, &value, flagp, depth,
- TRUE, /* => charclass */
- strict))
- {
- if (*flagp & RESTART_UTF8)
- FAIL("panic: grok_bslash_N set RESTART_UTF8");
- goto parseit;
- }
- }
- break;
- case 'p':
- case 'P':
- {
- char *e;
-
- /* We will handle any undefined properties ourselves */
- U8 swash_init_flags = _CORE_SWASH_INIT_RETURN_IF_UNDEF
- /* And we actually would prefer to get
- * the straight inversion list of the
- * swash, since we will be accessing it
- * anyway, to save a little time */
- |_CORE_SWASH_INIT_ACCEPT_INVLIST;
-
- if (RExC_parse >= RExC_end)
- vFAIL2("Empty \\%c{}", (U8)value);
- if (*RExC_parse == '{') {
- const U8 c = (U8)value;
- e = strchr(RExC_parse++, '}');
- if (!e)
- vFAIL2("Missing right brace on \\%c{}", c);
- while (isSPACE(*RExC_parse))
- RExC_parse++;
- if (e == RExC_parse)
- vFAIL2("Empty \\%c{}", c);
- n = e - RExC_parse;
- while (isSPACE(*(RExC_parse + n - 1)))
- n--;
- }
- else {
- e = RExC_parse;
- n = 1;
- }
- if (!SIZE_ONLY) {
- SV* invlist;
- char* name;
-
- if (UCHARAT(RExC_parse) == '^') {
- RExC_parse++;
- n--;
- /* toggle. (The rhs xor gets the single bit that
- * differs between P and p; the other xor inverts just
- * that bit) */
- value ^= 'P' ^ 'p';
-
- while (isSPACE(*RExC_parse)) {
- RExC_parse++;
- n--;
- }
- }
- /* Try to get the definition of the property into
- * <invlist>. If /i is in effect, the effective property
- * will have its name be <__NAME_i>. The design is
- * discussed in commit
- * 2f833f5208e26b208886e51e09e2c072b5eabb46 */
- name = savepv(Perl_form(aTHX_
- "%s%.*s%s\n",
- (FOLD) ? "__" : "",
- (int)n,
- RExC_parse,
- (FOLD) ? "_i" : ""
- ));
-
- /* Look up the property name, and get its swash and
- * inversion list, if the property is found */
- if (swash) {
- SvREFCNT_dec_NN(swash);
- }
- swash = _core_swash_init("utf8", name, &PL_sv_undef,
- 1, /* binary */
- 0, /* not tr/// */
- NULL, /* No inversion list */
- &swash_init_flags
- );
- if (! swash || ! (invlist = _get_swash_invlist(swash))) {
- HV* curpkg = (IN_PERL_COMPILETIME)
- ? PL_curstash
- : CopSTASH(PL_curcop);
- if (swash) {
- SvREFCNT_dec_NN(swash);
- swash = NULL;
- }
-
- /* Here didn't find it. It could be a user-defined
- * property that will be available at run-time. If we
- * accept only compile-time properties, is an error;
- * otherwise add it to the list for run-time look up */
- if (ret_invlist) {
- RExC_parse = e + 1;
- vFAIL2utf8f(
- "Property '%"UTF8f"' is unknown",
- UTF8fARG(UTF, n, name));
- }
-
- /* If the property name doesn't already have a package
- * name, add the current one to it so that it can be
- * referred to outside it. [perl #121777] */
- if (curpkg && ! instr(name, "::")) {
- char* pkgname = HvNAME(curpkg);
- if (strNE(pkgname, "main")) {
- char* full_name = Perl_form(aTHX_
- "%s::%s",
- pkgname,
- name);
- n = strlen(full_name);
- Safefree(name);
- name = savepvn(full_name, n);
- }
- }
- Perl_sv_catpvf(aTHX_ listsv, "%cutf8::%"UTF8f"\n",
- (value == 'p' ? '+' : '!'),
- UTF8fARG(UTF, n, name));
- has_user_defined_property = TRUE;
-
- /* We don't know yet, so have to assume that the
- * property could match something in the Latin1 range,
- * hence something that isn't utf8. Note that this
- * would cause things in <depends_list> to match
- * inappropriately, except that any \p{}, including
- * this one forces Unicode semantics, which means there
- * is no <depends_list> */
- ANYOF_FLAGS(ret) |= ANYOF_NONBITMAP_NON_UTF8;
- }
- else {
-
- /* Here, did get the swash and its inversion list. If
- * the swash is from a user-defined property, then this
- * whole character class should be regarded as such */
- if (swash_init_flags
- & _CORE_SWASH_INIT_USER_DEFINED_PROPERTY)
- {
- has_user_defined_property = TRUE;
- }
- else if
- /* We warn on matching an above-Unicode code point
- * if the match would return true, except don't
- * warn for \p{All}, which has exactly one element
- * = 0 */
- (_invlist_contains_cp(invlist, 0x110000)
- && (! (_invlist_len(invlist) == 1
- && *invlist_array(invlist) == 0)))
- {
- warn_super = TRUE;
- }
-
-
- /* Invert if asking for the complement */
- if (value == 'P') {
- _invlist_union_complement_2nd(properties,
- invlist,
- &properties);
-
- /* The swash can't be used as-is, because we've
- * inverted things; delay removing it to here after
- * have copied its invlist above */
- SvREFCNT_dec_NN(swash);
- swash = NULL;
- }
- else {
- _invlist_union(properties, invlist, &properties);
- }
- }
- Safefree(name);
- }
- RExC_parse = e + 1;
- namedclass = ANYOF_UNIPROP; /* no official name, but it's
- named */
-
- /* \p means they want Unicode semantics */
- RExC_uni_semantics = 1;
- }
- break;
- case 'n': value = '\n'; break;
- case 'r': value = '\r'; break;
- case 't': value = '\t'; break;
- case 'f': value = '\f'; break;
- case 'b': value = '\b'; break;
- case 'e': value = ASCII_TO_NATIVE('\033');break;
- case 'a': value = '\a'; break;
- case 'o':
- RExC_parse--; /* function expects to be pointed at the 'o' */
- {
- const char* error_msg;
- bool valid = grok_bslash_o(&RExC_parse,
- &value,
- &error_msg,
- SIZE_ONLY, /* warnings in pass
- 1 only */
- strict,
- silence_non_portable,
- UTF);
- if (! valid) {
- vFAIL(error_msg);
- }
- }
- if (PL_encoding && value < 0x100) {
- goto recode_encoding;
- }
- break;
- case 'x':
- RExC_parse--; /* function expects to be pointed at the 'x' */
- {
- const char* error_msg;
- bool valid = grok_bslash_x(&RExC_parse,
- &value,
- &error_msg,
- TRUE, /* Output warnings */
- strict,
- silence_non_portable,
- UTF);
- if (! valid) {
- vFAIL(error_msg);
- }
- }
- if (PL_encoding && value < 0x100)
- goto recode_encoding;
- break;
- case 'c':
- value = grok_bslash_c(*RExC_parse++, SIZE_ONLY);
- break;
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7':
- {
- /* Take 1-3 octal digits */
- I32 flags = PERL_SCAN_SILENT_ILLDIGIT;
- numlen = (strict) ? 4 : 3;
- value = grok_oct(--RExC_parse, &numlen, &flags, NULL);
- RExC_parse += numlen;
- if (numlen != 3) {
- if (strict) {
- RExC_parse += (UTF) ? UTF8SKIP(RExC_parse) : 1;
- vFAIL("Need exactly 3 octal digits");
- }
- else if (! SIZE_ONLY /* like \08, \178 */
- && numlen < 3
- && RExC_parse < RExC_end
- && isDIGIT(*RExC_parse)
- && ckWARN(WARN_REGEXP))
- {
- SAVEFREESV(RExC_rx_sv);
- reg_warn_non_literal_string(
- RExC_parse + 1,
- form_short_octal_warning(RExC_parse, numlen));
- (void)ReREFCNT_inc(RExC_rx_sv);
- }
- }
- if (PL_encoding && value < 0x100)
- goto recode_encoding;
- break;
- }
- recode_encoding:
- if (! RExC_override_recoding) {
- SV* enc = PL_encoding;
- value = reg_recode((const char)(U8)value, &enc);
- if (!enc) {
- if (strict) {
- vFAIL("Invalid escape in the specified encoding");
- }
- else if (SIZE_ONLY) {
- ckWARNreg(RExC_parse,
- "Invalid escape in the specified encoding");
- }
- }
- break;
- }
- default:
- /* Allow \_ to not give an error */
- if (!SIZE_ONLY && isWORDCHAR(value) && value != '_') {
- if (strict) {
- vFAIL2("Unrecognized escape \\%c in character class",
- (int)value);
- }
- else {
- SAVEFREESV(RExC_rx_sv);
- ckWARN2reg(RExC_parse,
- "Unrecognized escape \\%c in character class passed through",
- (int)value);
- (void)ReREFCNT_inc(RExC_rx_sv);
- }
- }
- break;
- } /* End of switch on char following backslash */
- } /* end of handling backslash escape sequences */
-#ifdef EBCDIC
- else
- literal_endpoint++;
-#endif
-
- /* Here, we have the current token in 'value' */
-
- if (namedclass > OOB_NAMEDCLASS) { /* this is a named class \blah */
- U8 classnum;
-
- /* a bad range like a-\d, a-[:digit:]. The '-' is taken as a
- * literal, as is the character that began the false range, i.e.
- * the 'a' in the examples */
- if (range) {
- if (!SIZE_ONLY) {
- const int w = (RExC_parse >= rangebegin)
- ? RExC_parse - rangebegin
- : 0;
- if (strict) {
- vFAIL2utf8f(
- "False [] range \"%"UTF8f"\"",
- UTF8fARG(UTF, w, rangebegin));
- }
- else {
- SAVEFREESV(RExC_rx_sv); /* in case of fatal warnings */
- ckWARN2reg(RExC_parse,
- "False [] range \"%"UTF8f"\"",
- UTF8fARG(UTF, w, rangebegin));
- (void)ReREFCNT_inc(RExC_rx_sv);
- cp_list = add_cp_to_invlist(cp_list, '-');
- cp_foldable_list = add_cp_to_invlist(cp_foldable_list,
- prevvalue);
- }
- }
-
- range = 0; /* this was not a true range */
- element_count += 2; /* So counts for three values */
- }
-
- classnum = namedclass_to_classnum(namedclass);
-
- if (LOC && namedclass < ANYOF_POSIXL_MAX
-#ifndef HAS_ISASCII
- && classnum != _CC_ASCII
-#endif
- ) {
- /* What the Posix classes (like \w, [:space:]) match in locale
- * isn't knowable under locale until actual match time. Room
- * must be reserved (one time per outer bracketed class) to
- * store such classes. The space will contain a bit for each
- * named class that is to be matched against. This isn't
- * needed for \p{} and pseudo-classes, as they are not affected
- * by locale, and hence are dealt with separately */
- if (! need_class) {
- need_class = 1;
- if (SIZE_ONLY) {
- RExC_size += ANYOF_POSIXL_SKIP - ANYOF_SKIP;
- }
- else {
- RExC_emit += ANYOF_POSIXL_SKIP - ANYOF_SKIP;
- }
- ANYOF_FLAGS(ret) |= ANYOF_POSIXL;
- ANYOF_POSIXL_ZERO(ret);
- }
-
- /* Coverity thinks it is possible for this to be negative; both
- * jhi and khw think it's not, but be safer */
- assert(! (ANYOF_FLAGS(ret) & ANYOF_POSIXL)
- || (namedclass + ((namedclass % 2) ? -1 : 1)) >= 0);
-
- /* See if it already matches the complement of this POSIX
- * class */
- if ((ANYOF_FLAGS(ret) & ANYOF_POSIXL)
- && ANYOF_POSIXL_TEST(ret, namedclass + ((namedclass % 2)
- ? -1
- : 1)))
- {
- posixl_matches_all = TRUE;
- break; /* No need to continue. Since it matches both
- e.g., \w and \W, it matches everything, and the
- bracketed class can be optimized into qr/./s */
- }
-
- /* Add this class to those that should be checked at runtime */
- ANYOF_POSIXL_SET(ret, namedclass);
-
- /* The above-Latin1 characters are not subject to locale rules.
- * Just add them, in the second pass, to the
- * unconditionally-matched list */
- if (! SIZE_ONLY) {
- SV* scratch_list = NULL;
-
- /* Get the list of the above-Latin1 code points this
- * matches */
- _invlist_intersection_maybe_complement_2nd(PL_AboveLatin1,
- PL_XPosix_ptrs[classnum],
-
- /* Odd numbers are complements, like
- * NDIGIT, NASCII, ... */
- namedclass % 2 != 0,
- &scratch_list);
- /* Checking if 'cp_list' is NULL first saves an extra
- * clone. Its reference count will be decremented at the
- * next union, etc, or if this is the only instance, at the
- * end of the routine */
- if (! cp_list) {
- cp_list = scratch_list;
- }
- else {
- _invlist_union(cp_list, scratch_list, &cp_list);
- SvREFCNT_dec_NN(scratch_list);
- }
- continue; /* Go get next character */
- }
- }
- else if (! SIZE_ONLY) {
-
- /* Here, not in pass1 (in that pass we skip calculating the
- * contents of this class), and is /l, or is a POSIX class for
- * which /l doesn't matter (or is a Unicode property, which is
- * skipped here). */
- if (namedclass >= ANYOF_POSIXL_MAX) { /* If a special class */
- if (namedclass != ANYOF_UNIPROP) { /* UNIPROP = \p and \P */
-
- /* Here, should be \h, \H, \v, or \V. None of /d, /i
- * nor /l make a difference in what these match,
- * therefore we just add what they match to cp_list. */
- if (classnum != _CC_VERTSPACE) {
- assert( namedclass == ANYOF_HORIZWS
- || namedclass == ANYOF_NHORIZWS);
-
- /* It turns out that \h is just a synonym for
- * XPosixBlank */
- classnum = _CC_BLANK;
- }
-
- _invlist_union_maybe_complement_2nd(
- cp_list,
- PL_XPosix_ptrs[classnum],
- namedclass % 2 != 0, /* Complement if odd
- (NHORIZWS, NVERTWS)
- */
- &cp_list);
- }
- }
- else { /* Garden variety class. If is NASCII, NDIGIT, ...
- complement and use nposixes */
- SV** posixes_ptr = namedclass % 2 == 0
- ? &posixes
- : &nposixes;
- SV** source_ptr = &PL_XPosix_ptrs[classnum];
- _invlist_union_maybe_complement_2nd(
- *posixes_ptr,
- *source_ptr,
- namedclass % 2 != 0,
- posixes_ptr);
- }
- continue; /* Go get next character */
- }
- } /* end of namedclass \blah */
-
- /* Here, we have a single value. If 'range' is set, it is the ending
- * of a range--check its validity. Later, we will handle each
- * individual code point in the range. If 'range' isn't set, this
- * could be the beginning of a range, so check for that by looking
- * ahead to see if the next real character to be processed is the range
- * indicator--the minus sign */
-
- if (skip_white) {
- RExC_parse = regpatws(pRExC_state, RExC_parse,
- FALSE /* means don't recognize comments */ );
- }
-
- if (range) {
- if (prevvalue > value) /* b-a */ {
- const int w = RExC_parse - rangebegin;
- vFAIL2utf8f(
- "Invalid [] range \"%"UTF8f"\"",
- UTF8fARG(UTF, w, rangebegin));
- range = 0; /* not a valid range */
- }
- }
- else {
- prevvalue = value; /* save the beginning of the potential range */
- if (! stop_at_1 /* Can't be a range if parsing just one thing */
- && *RExC_parse == '-')
- {
- char* next_char_ptr = RExC_parse + 1;
- if (skip_white) { /* Get the next real char after the '-' */
- next_char_ptr = regpatws(pRExC_state,
- RExC_parse + 1,
- FALSE); /* means don't recognize
- comments */
- }
-
- /* If the '-' is at the end of the class (just before the ']',
- * it is a literal minus; otherwise it is a range */
- if (next_char_ptr < RExC_end && *next_char_ptr != ']') {
- RExC_parse = next_char_ptr;
-
- /* a bad range like \w-, [:word:]- ? */
- if (namedclass > OOB_NAMEDCLASS) {
- if (strict || ckWARN(WARN_REGEXP)) {
- const int w =
- RExC_parse >= rangebegin ?
- RExC_parse - rangebegin : 0;
- if (strict) {
- vFAIL4("False [] range \"%*.*s\"",
- w, w, rangebegin);
- }
- else {
- vWARN4(RExC_parse,
- "False [] range \"%*.*s\"",
- w, w, rangebegin);
- }
- }
- if (!SIZE_ONLY) {
- cp_list = add_cp_to_invlist(cp_list, '-');
- }
- element_count++;
- } else
- range = 1; /* yeah, it's a range! */
- continue; /* but do it the next time */
- }
- }
- }
-
- /* Here, <prevvalue> is the beginning of the range, if any; or <value>
- * if not */
-
- /* non-Latin1 code point implies unicode semantics. Must be set in
- * pass1 so is there for the whole of pass 2 */
- if (value > 255) {
- RExC_uni_semantics = 1;
- }
-
- /* Ready to process either the single value, or the completed range.
- * For single-valued non-inverted ranges, we consider the possibility
- * of multi-char folds. (We made a conscious decision to not do this
- * for the other cases because it can often lead to non-intuitive
- * results. For example, you have the peculiar case that:
- * "s s" =~ /^[^\xDF]+$/i => Y
- * "ss" =~ /^[^\xDF]+$/i => N
- *
- * See [perl #89750] */
- if (FOLD && allow_multi_folds && value == prevvalue) {
- if (value == LATIN_SMALL_LETTER_SHARP_S
- || (value > 255 && _invlist_contains_cp(PL_HasMultiCharFold,
- value)))
- {
- /* Here <value> is indeed a multi-char fold. Get what it is */
-
- U8 foldbuf[UTF8_MAXBYTES_CASE];
- STRLEN foldlen;
-
- UV folded = _to_uni_fold_flags(
- value,
- foldbuf,
- &foldlen,
- FOLD_FLAGS_FULL | (ASCII_FOLD_RESTRICTED
- ? FOLD_FLAGS_NOMIX_ASCII
- : 0)
- );
-
- /* Here, <folded> should be the first character of the
- * multi-char fold of <value>, with <foldbuf> containing the
- * whole thing. But, if this fold is not allowed (because of
- * the flags), <fold> will be the same as <value>, and should
- * be processed like any other character, so skip the special
- * handling */
- if (folded != value) {
-
- /* Skip if we are recursed, currently parsing the class
- * again. Otherwise add this character to the list of
- * multi-char folds. */
- if (! RExC_in_multi_char_class) {
- AV** this_array_ptr;
- AV* this_array;
- STRLEN cp_count = utf8_length(foldbuf,
- foldbuf + foldlen);
- SV* multi_fold = sv_2mortal(newSVpvs(""));
-
- Perl_sv_catpvf(aTHX_ multi_fold, "\\x{%"UVXf"}", value);
-
-
- if (! multi_char_matches) {
- multi_char_matches = newAV();
- }
-
- /* <multi_char_matches> is actually an array of arrays.
- * There will be one or two top-level elements: [2],
- * and/or [3]. The [2] element is an array, each
- * element thereof is a character which folds to TWO
- * characters; [3] is for folds to THREE characters.
- * (Unicode guarantees a maximum of 3 characters in any
- * fold.) When we rewrite the character class below,
- * we will do so such that the longest folds are
- * written first, so that it prefers the longest
- * matching strings first. This is done even if it
- * turns out that any quantifier is non-greedy, out of
- * programmer laziness. Tom Christiansen has agreed
- * that this is ok. This makes the test for the
- * ligature 'ffi' come before the test for 'ff' */
- if (av_exists(multi_char_matches, cp_count)) {
- this_array_ptr = (AV**) av_fetch(multi_char_matches,
- cp_count, FALSE);
- this_array = *this_array_ptr;
- }
- else {
- this_array = newAV();
- av_store(multi_char_matches, cp_count,
- (SV*) this_array);
- }
- av_push(this_array, multi_fold);
- }
-
- /* This element should not be processed further in this
- * class */
- element_count--;
- value = save_value;
- prevvalue = save_prevvalue;
- continue;
- }
- }
- }
-
- /* Deal with this element of the class */
- if (! SIZE_ONLY) {
-#ifndef EBCDIC
- cp_foldable_list = _add_range_to_invlist(cp_foldable_list,
- prevvalue, value);
-#else
- SV* this_range = _new_invlist(1);
- _append_range_to_invlist(this_range, prevvalue, value);
-
- /* In EBCDIC, the ranges 'A-Z' and 'a-z' are each not contiguous.
- * If this range was specified using something like 'i-j', we want
- * to include only the 'i' and the 'j', and not anything in
- * between, so exclude non-ASCII, non-alphabetics from it.
- * However, if the range was specified with something like
- * [\x89-\x91] or [\x89-j], all code points within it should be
- * included. literal_endpoint==2 means both ends of the range used
- * a literal character, not \x{foo} */
- if (literal_endpoint == 2
- && ((prevvalue >= 'a' && value <= 'z')
- || (prevvalue >= 'A' && value <= 'Z')))
- {
- _invlist_intersection(this_range, PL_XPosix_ptrs[_CC_ASCII],
- &this_range);
-
- /* Since this above only contains ascii, the intersection of it
- * with anything will still yield only ascii */
- _invlist_intersection(this_range, PL_XPosix_ptrs[_CC_ALPHA],
- &this_range);
- }
- _invlist_union(cp_foldable_list, this_range, &cp_foldable_list);
- literal_endpoint = 0;
-#endif
- }
-
- range = 0; /* this range (if it was one) is done now */
- } /* End of loop through all the text within the brackets */
-
- /* If anything in the class expands to more than one character, we have to
- * deal with them by building up a substitute parse string, and recursively
- * calling reg() on it, instead of proceeding */
- if (multi_char_matches) {
- SV * substitute_parse = newSVpvn_flags("?:", 2, SVs_TEMP);
- I32 cp_count;
- STRLEN len;
- char *save_end = RExC_end;
- char *save_parse = RExC_parse;
- bool first_time = TRUE; /* First multi-char occurrence doesn't get
- a "|" */
- I32 reg_flags;
-
- assert(! invert);
-#if 0 /* Have decided not to deal with multi-char folds in inverted classes,
- because too confusing */
- if (invert) {
- sv_catpv(substitute_parse, "(?:");
- }
-#endif
-
- /* Look at the longest folds first */
- for (cp_count = av_tindex(multi_char_matches); cp_count > 0; cp_count--) {
-
- if (av_exists(multi_char_matches, cp_count)) {
- AV** this_array_ptr;
- SV* this_sequence;
-
- this_array_ptr = (AV**) av_fetch(multi_char_matches,
- cp_count, FALSE);
- while ((this_sequence = av_pop(*this_array_ptr)) !=
- &PL_sv_undef)
- {
- if (! first_time) {
- sv_catpv(substitute_parse, "|");
- }
- first_time = FALSE;
-
- sv_catpv(substitute_parse, SvPVX(this_sequence));
- }
- }
- }
-
- /* If the character class contains anything else besides these
- * multi-character folds, have to include it in recursive parsing */
- if (element_count) {
- sv_catpv(substitute_parse, "|[");
- sv_catpvn(substitute_parse, orig_parse, RExC_parse - orig_parse);
- sv_catpv(substitute_parse, "]");
- }
-
- sv_catpv(substitute_parse, ")");
-#if 0
- if (invert) {
- /* This is a way to get the parse to skip forward a whole named
- * sequence instead of matching the 2nd character when it fails the
- * first */
- sv_catpv(substitute_parse, "(*THEN)(*SKIP)(*FAIL)|.)");
- }
-#endif
-
- RExC_parse = SvPV(substitute_parse, len);
- RExC_end = RExC_parse + len;
- RExC_in_multi_char_class = 1;
- RExC_emit = (regnode *)orig_emit;
-
- ret = reg(pRExC_state, 1, ®_flags, depth+1);
-
- *flagp |= reg_flags&(HASWIDTH|SIMPLE|SPSTART|POSTPONED|RESTART_UTF8);
-
- RExC_parse = save_parse;
- RExC_end = save_end;
- RExC_in_multi_char_class = 0;
- SvREFCNT_dec_NN(multi_char_matches);
- return ret;
- }
-
- /* Here, we've gone through the entire class and dealt with multi-char
- * folds. We are now in a position that we can do some checks to see if we
- * can optimize this ANYOF node into a simpler one, even in Pass 1.
- * Currently we only do two checks:
- * 1) is in the unlikely event that the user has specified both, eg. \w and
- * \W under /l, then the class matches everything. (This optimization
- * is done only to make the optimizer code run later work.)
- * 2) if the character class contains only a single element (including a
- * single range), we see if there is an equivalent node for it.
- * Other checks are possible */
- if (! ret_invlist /* Can't optimize if returning the constructed
- inversion list */
- && (UNLIKELY(posixl_matches_all) || element_count == 1))
- {
- U8 op = END;
- U8 arg = 0;
-
- if (UNLIKELY(posixl_matches_all)) {
- op = SANY;
- }
- else if (namedclass > OOB_NAMEDCLASS) { /* this is a named class, like
- \w or [:digit:] or \p{foo}
- */
-
- /* All named classes are mapped into POSIXish nodes, with its FLAG
- * argument giving which class it is */
- switch ((I32)namedclass) {
- case ANYOF_UNIPROP:
- break;
-
- /* These don't depend on the charset modifiers. They always
- * match under /u rules */
- case ANYOF_NHORIZWS:
- case ANYOF_HORIZWS:
- namedclass = ANYOF_BLANK + namedclass - ANYOF_HORIZWS;
- /* FALLTHROUGH */
-
- case ANYOF_NVERTWS:
- case ANYOF_VERTWS:
- op = POSIXU;
- goto join_posix;
-
- /* The actual POSIXish node for all the rest depends on the
- * charset modifier. The ones in the first set depend only on
- * ASCII or, if available on this platform, locale */
- case ANYOF_ASCII:
- case ANYOF_NASCII:
-#ifdef HAS_ISASCII
- op = (LOC) ? POSIXL : POSIXA;
-#else
- op = POSIXA;
-#endif
- goto join_posix;
-
- case ANYOF_NCASED:
- case ANYOF_LOWER:
- case ANYOF_NLOWER:
- case ANYOF_UPPER:
- case ANYOF_NUPPER:
- /* under /a could be alpha */
- if (FOLD) {
- if (ASCII_RESTRICTED) {
- namedclass = ANYOF_ALPHA + (namedclass % 2);
- }
- else if (! LOC) {
- break;
- }
- }
- /* FALLTHROUGH */
-
- /* The rest have more possibilities depending on the charset.
- * We take advantage of the enum ordering of the charset
- * modifiers to get the exact node type, */
- default:
- op = POSIXD + get_regex_charset(RExC_flags);
- if (op > POSIXA) { /* /aa is same as /a */
- op = POSIXA;
- }
-
- join_posix:
- /* The odd numbered ones are the complements of the
- * next-lower even number one */
- if (namedclass % 2 == 1) {
- invert = ! invert;
- namedclass--;
- }
- arg = namedclass_to_classnum(namedclass);
- break;
- }
- }
- else if (value == prevvalue) {
-
- /* Here, the class consists of just a single code point */
-
- if (invert) {
- if (! LOC && value == '\n') {
- op = REG_ANY; /* Optimize [^\n] */
- *flagp |= HASWIDTH|SIMPLE;
- RExC_naughty++;
- }
- }
- else if (value < 256 || UTF) {
-
- /* Optimize a single value into an EXACTish node, but not if it
- * would require converting the pattern to UTF-8. */
- op = compute_EXACTish(pRExC_state);
- }
- } /* Otherwise is a range */
- else if (! LOC) { /* locale could vary these */
- if (prevvalue == '0') {
- if (value == '9') {
- arg = _CC_DIGIT;
- op = POSIXA;
- }
- }
- else if (prevvalue == 'A') {
- if (value == 'Z'
-#ifdef EBCDIC
- && literal_endpoint == 2
-#endif
- ) {
- arg = (FOLD) ? _CC_ALPHA : _CC_UPPER;
- op = POSIXA;
- }
- }
- else if (prevvalue == 'a') {
- if (value == 'z'
-#ifdef EBCDIC
- && literal_endpoint == 2
-#endif
- ) {
- arg = (FOLD) ? _CC_ALPHA : _CC_LOWER;
- op = POSIXA;
- }
- }
- }
-
- /* Here, we have changed <op> away from its initial value iff we found
- * an optimization */
- if (op != END) {
-
- /* Throw away this ANYOF regnode, and emit the calculated one,
- * which should correspond to the beginning, not current, state of
- * the parse */
- const char * cur_parse = RExC_parse;
- RExC_parse = (char *)orig_parse;
- if ( SIZE_ONLY) {
- if (! LOC) {
-
- /* To get locale nodes to not use the full ANYOF size would
- * require moving the code above that writes the portions
- * of it that aren't in other nodes to after this point.
- * e.g. ANYOF_POSIXL_SET */
- RExC_size = orig_size;
- }
- }
- else {
- RExC_emit = (regnode *)orig_emit;
- if (PL_regkind[op] == POSIXD) {
- if (op == POSIXL) {
- RExC_contains_locale = 1;
- }
- if (invert) {
- op += NPOSIXD - POSIXD;
- }
- }
- }
-
- ret = reg_node(pRExC_state, op);
-
- if (PL_regkind[op] == POSIXD || PL_regkind[op] == NPOSIXD) {
- if (! SIZE_ONLY) {
- FLAGS(ret) = arg;
- }
- *flagp |= HASWIDTH|SIMPLE;
- }
- else if (PL_regkind[op] == EXACT) {
- alloc_maybe_populate_EXACT(pRExC_state, ret, flagp, 0, value,
- TRUE /* downgradable to EXACT */
- );
- }
-
- RExC_parse = (char *) cur_parse;
-
- SvREFCNT_dec(posixes);
- SvREFCNT_dec(nposixes);
- SvREFCNT_dec(cp_list);
- SvREFCNT_dec(cp_foldable_list);
- return ret;
- }
- }
-
- if (SIZE_ONLY)
- return ret;
- /****** !SIZE_ONLY (Pass 2) AFTER HERE *********/
-
- /* If folding, we calculate all characters that could fold to or from the
- * ones already on the list */
- if (cp_foldable_list) {
- if (FOLD) {
- UV start, end; /* End points of code point ranges */
-
- SV* fold_intersection = NULL;
- SV** use_list;
-
- /* Our calculated list will be for Unicode rules. For locale
- * matching, we have to keep a separate list that is consulted at
- * runtime only when the locale indicates Unicode rules. For
- * non-locale, we just use to the general list */
- if (LOC) {
- use_list = &only_utf8_locale_list;
- }
- else {
- use_list = &cp_list;
- }
-
- /* Only the characters in this class that participate in folds need
- * be checked. Get the intersection of this class and all the
- * possible characters that are foldable. This can quickly narrow
- * down a large class */
- _invlist_intersection(PL_utf8_foldable, cp_foldable_list,
- &fold_intersection);
-
- /* The folds for all the Latin1 characters are hard-coded into this
- * program, but we have to go out to disk to get the others. */
- if (invlist_highest(cp_foldable_list) >= 256) {
-
- /* This is a hash that for a particular fold gives all
- * characters that are involved in it */
- if (! PL_utf8_foldclosures) {
- _load_PL_utf8_foldclosures();
- }
- }
-
- /* Now look at the foldable characters in this class individually */
- invlist_iterinit(fold_intersection);
- while (invlist_iternext(fold_intersection, &start, &end)) {
- UV j;
-
- /* Look at every character in the range */
- for (j = start; j <= end; j++) {
- U8 foldbuf[UTF8_MAXBYTES_CASE+1];
- STRLEN foldlen;
- SV** listp;
-
- if (j < 256) {
-
- if (IS_IN_SOME_FOLD_L1(j)) {
-
- /* ASCII is always matched; non-ASCII is matched
- * only under Unicode rules (which could happen
- * under /l if the locale is a UTF-8 one */
- if (isASCII(j) || ! DEPENDS_SEMANTICS) {
- *use_list = add_cp_to_invlist(*use_list,
- PL_fold_latin1[j]);
- }
- else {
- depends_list =
- add_cp_to_invlist(depends_list,
- PL_fold_latin1[j]);
- }
- }
-
- if (HAS_NONLATIN1_SIMPLE_FOLD_CLOSURE(j)
- && (! isASCII(j) || ! ASCII_FOLD_RESTRICTED))
- {
- add_above_Latin1_folds(pRExC_state,
- (U8) j,
- use_list);
- }
- continue;
- }
-
- /* Here is an above Latin1 character. We don't have the
- * rules hard-coded for it. First, get its fold. This is
- * the simple fold, as the multi-character folds have been
- * handled earlier and separated out */
- _to_uni_fold_flags(j, foldbuf, &foldlen,
- (ASCII_FOLD_RESTRICTED)
- ? FOLD_FLAGS_NOMIX_ASCII
- : 0);
-
- /* Single character fold of above Latin1. Add everything in
- * its fold closure to the list that this node should match.
- * The fold closures data structure is a hash with the keys
- * being the UTF-8 of every character that is folded to, like
- * 'k', and the values each an array of all code points that
- * fold to its key. e.g. [ 'k', 'K', KELVIN_SIGN ].
- * Multi-character folds are not included */
- if ((listp = hv_fetch(PL_utf8_foldclosures,
- (char *) foldbuf, foldlen, FALSE)))
- {
- AV* list = (AV*) *listp;
- IV k;
- for (k = 0; k <= av_tindex(list); k++) {
- SV** c_p = av_fetch(list, k, FALSE);
- UV c;
- assert(c_p);
-
- c = SvUV(*c_p);
-
- /* /aa doesn't allow folds between ASCII and non- */
- if ((ASCII_FOLD_RESTRICTED
- && (isASCII(c) != isASCII(j))))
- {
- continue;
- }
-
- /* Folds under /l which cross the 255/256 boundary
- * are added to a separate list. (These are valid
- * only when the locale is UTF-8.) */
- if (c < 256 && LOC) {
- *use_list = add_cp_to_invlist(*use_list, c);
- continue;
- }
-
- if (isASCII(c) || c > 255 || AT_LEAST_UNI_SEMANTICS)
- {
- cp_list = add_cp_to_invlist(cp_list, c);
- }
- else {
- /* Similarly folds involving non-ascii Latin1
- * characters under /d are added to their list */
- depends_list = add_cp_to_invlist(depends_list,
- c);
- }
- }
- }
- }
- }
- SvREFCNT_dec_NN(fold_intersection);
- }
-
- /* Now that we have finished adding all the folds, there is no reason
- * to keep the foldable list separate */
- _invlist_union(cp_list, cp_foldable_list, &cp_list);
- SvREFCNT_dec_NN(cp_foldable_list);
- }
-
- /* And combine the result (if any) with any inversion list from posix
- * classes. The lists are kept separate up to now because we don't want to
- * fold the classes (folding of those is automatically handled by the swash
- * fetching code) */
- if (posixes || nposixes) {
- if (posixes && AT_LEAST_ASCII_RESTRICTED) {
- /* Under /a and /aa, nothing above ASCII matches these */
- _invlist_intersection(posixes,
- PL_XPosix_ptrs[_CC_ASCII],
- &posixes);
- }
- if (nposixes) {
- if (DEPENDS_SEMANTICS) {
- /* Under /d, everything in the upper half of the Latin1 range
- * matches these complements */
- ANYOF_FLAGS(ret) |= ANYOF_NON_UTF8_NON_ASCII_ALL;
- }
- else if (AT_LEAST_ASCII_RESTRICTED) {
- /* Under /a and /aa, everything above ASCII matches these
- * complements */
- _invlist_union_complement_2nd(nposixes,
- PL_XPosix_ptrs[_CC_ASCII],
- &nposixes);
- }
- if (posixes) {
- _invlist_union(posixes, nposixes, &posixes);
- SvREFCNT_dec_NN(nposixes);
- }
- else {
- posixes = nposixes;
- }
- }
- if (! DEPENDS_SEMANTICS) {
- if (cp_list) {
- _invlist_union(cp_list, posixes, &cp_list);
- SvREFCNT_dec_NN(posixes);
- }
- else {
- cp_list = posixes;
- }
- }
- else {
- /* Under /d, we put into a separate list the Latin1 things that
- * match only when the target string is utf8 */
- SV* nonascii_but_latin1_properties = NULL;
- _invlist_intersection(posixes, PL_UpperLatin1,
- &nonascii_but_latin1_properties);
- _invlist_subtract(posixes, nonascii_but_latin1_properties,
- &posixes);
- if (cp_list) {
- _invlist_union(cp_list, posixes, &cp_list);
- SvREFCNT_dec_NN(posixes);
- }
- else {
- cp_list = posixes;
- }
-
- if (depends_list) {
- _invlist_union(depends_list, nonascii_but_latin1_properties,
- &depends_list);
- SvREFCNT_dec_NN(nonascii_but_latin1_properties);
- }
- else {
- depends_list = nonascii_but_latin1_properties;
- }
- }
- }
-
- /* And combine the result (if any) with any inversion list from properties.
- * The lists are kept separate up to now so that we can distinguish the two
- * in regards to matching above-Unicode. A run-time warning is generated
- * if a Unicode property is matched against a non-Unicode code point. But,
- * we allow user-defined properties to match anything, without any warning,
- * and we also suppress the warning if there is a portion of the character
- * class that isn't a Unicode property, and which matches above Unicode, \W
- * or [\x{110000}] for example.
- * (Note that in this case, unlike the Posix one above, there is no
- * <depends_list>, because having a Unicode property forces Unicode
- * semantics */
- if (properties) {
- if (cp_list) {
-
- /* If it matters to the final outcome, see if a non-property
- * component of the class matches above Unicode. If so, the
- * warning gets suppressed. This is true even if just a single
- * such code point is specified, as though not strictly correct if
- * another such code point is matched against, the fact that they
- * are using above-Unicode code points indicates they should know
- * the issues involved */
- if (warn_super) {
- warn_super = ! (invert
- ^ (invlist_highest(cp_list) > PERL_UNICODE_MAX));
- }
-
- _invlist_union(properties, cp_list, &cp_list);
- SvREFCNT_dec_NN(properties);
- }
- else {
- cp_list = properties;
- }
-
- if (warn_super) {
- ANYOF_FLAGS(ret) |= ANYOF_WARN_SUPER;
- }
- }
-
- /* Here, we have calculated what code points should be in the character
- * class.
- *
- * Now we can see about various optimizations. Fold calculation (which we
- * did above) needs to take place before inversion. Otherwise /[^k]/i
- * would invert to include K, which under /i would match k, which it
- * shouldn't. Therefore we can't invert folded locale now, as it won't be
- * folded until runtime */
-
- /* If we didn't do folding, it's because some information isn't available
- * until runtime; set the run-time fold flag for these. (We don't have to
- * worry about properties folding, as that is taken care of by the swash
- * fetching). We know to set the flag if we have a non-NULL list for UTF-8
- * locales, or the class matches at least one 0-255 range code point */
- if (LOC && FOLD) {
- if (only_utf8_locale_list) {
- ANYOF_FLAGS(ret) |= ANYOF_LOC_FOLD;
- }
- else if (cp_list) { /* Look to see if there a 0-255 code point is in
- the list */
- UV start, end;
- invlist_iterinit(cp_list);
- if (invlist_iternext(cp_list, &start, &end) && start < 256) {
- ANYOF_FLAGS(ret) |= ANYOF_LOC_FOLD;
- }
- invlist_iterfinish(cp_list);
- }
- }
-
- /* Optimize inverted simple patterns (e.g. [^a-z]) when everything is known
- * at compile time. Besides not inverting folded locale now, we can't
- * invert if there are things such as \w, which aren't known until runtime
- * */
- if (cp_list
- && invert
- && ! (ANYOF_FLAGS(ret) & (ANYOF_LOCALE_FLAGS))
- && ! depends_list
- && ! HAS_NONLOCALE_RUNTIME_PROPERTY_DEFINITION)
- {
- _invlist_invert(cp_list);
-
- /* Any swash can't be used as-is, because we've inverted things */
- if (swash) {
- SvREFCNT_dec_NN(swash);
- swash = NULL;
- }
-
- /* Clear the invert flag since have just done it here */
- invert = FALSE;
- }
-
- if (ret_invlist) {
- *ret_invlist = cp_list;
- SvREFCNT_dec(swash);
-
- /* Discard the generated node */
- if (SIZE_ONLY) {
- RExC_size = orig_size;
- }
- else {
- RExC_emit = orig_emit;
- }
- return orig_emit;
- }
-
- /* Some character classes are equivalent to other nodes. Such nodes take
- * up less room and generally fewer operations to execute than ANYOF nodes.
- * Above, we checked for and optimized into some such equivalents for
- * certain common classes that are easy to test. Getting to this point in
- * the code means that the class didn't get optimized there. Since this
- * code is only executed in Pass 2, it is too late to save space--it has
- * been allocated in Pass 1, and currently isn't given back. But turning
- * things into an EXACTish node can allow the optimizer to join it to any
- * adjacent such nodes. And if the class is equivalent to things like /./,
- * expensive run-time swashes can be avoided. Now that we have more
- * complete information, we can find things necessarily missed by the
- * earlier code. I (khw) am not sure how much to look for here. It would
- * be easy, but perhaps too slow, to check any candidates against all the
- * node types they could possibly match using _invlistEQ(). */
-
- if (cp_list
- && ! invert
- && ! depends_list
- && ! (ANYOF_FLAGS(ret) & (ANYOF_LOCALE_FLAGS))
- && ! HAS_NONLOCALE_RUNTIME_PROPERTY_DEFINITION
-
- /* We don't optimize if we are supposed to make sure all non-Unicode
- * code points raise a warning, as only ANYOF nodes have this check.
- * */
- && ! ((ANYOF_FLAGS(ret) & ANYOF_WARN_SUPER) && ALWAYS_WARN_SUPER))
- {
- UV start, end;
- U8 op = END; /* The optimzation node-type */
- const char * cur_parse= RExC_parse;
-
- invlist_iterinit(cp_list);
- if (! invlist_iternext(cp_list, &start, &end)) {
-
- /* Here, the list is empty. This happens, for example, when a
- * Unicode property is the only thing in the character class, and
- * it doesn't match anything. (perluniprops.pod notes such
- * properties) */
- op = OPFAIL;
- *flagp |= HASWIDTH|SIMPLE;
- }
- else if (start == end) { /* The range is a single code point */
- if (! invlist_iternext(cp_list, &start, &end)
-
- /* Don't do this optimization if it would require changing
- * the pattern to UTF-8 */
- && (start < 256 || UTF))
- {
- /* Here, the list contains a single code point. Can optimize
- * into an EXACTish node */
-
- value = start;
-
- if (! FOLD) {
- op = EXACT;
- }
- else if (LOC) {
-
- /* A locale node under folding with one code point can be
- * an EXACTFL, as its fold won't be calculated until
- * runtime */
- op = EXACTFL;
- }
- else {
-
- /* Here, we are generally folding, but there is only one
- * code point to match. If we have to, we use an EXACT
- * node, but it would be better for joining with adjacent
- * nodes in the optimization pass if we used the same
- * EXACTFish node that any such are likely to be. We can
- * do this iff the code point doesn't participate in any
- * folds. For example, an EXACTF of a colon is the same as
- * an EXACT one, since nothing folds to or from a colon. */
- if (value < 256) {
- if (IS_IN_SOME_FOLD_L1(value)) {
- op = EXACT;
- }
- }
- else {
- if (_invlist_contains_cp(PL_utf8_foldable, value)) {
- op = EXACT;
- }
- }
-
- /* If we haven't found the node type, above, it means we
- * can use the prevailing one */
- if (op == END) {
- op = compute_EXACTish(pRExC_state);
- }
- }
- }
- }
- else if (start == 0) {
- if (end == UV_MAX) {
- op = SANY;
- *flagp |= HASWIDTH|SIMPLE;
- RExC_naughty++;
- }
- else if (end == '\n' - 1
- && invlist_iternext(cp_list, &start, &end)
- && start == '\n' + 1 && end == UV_MAX)
- {
- op = REG_ANY;
- *flagp |= HASWIDTH|SIMPLE;
- RExC_naughty++;
- }
- }
- invlist_iterfinish(cp_list);
-
- if (op != END) {
- RExC_parse = (char *)orig_parse;
- RExC_emit = (regnode *)orig_emit;
-
- ret = reg_node(pRExC_state, op);
-
- RExC_parse = (char *)cur_parse;
-
- if (PL_regkind[op] == EXACT) {
- alloc_maybe_populate_EXACT(pRExC_state, ret, flagp, 0, value,
- TRUE /* downgradable to EXACT */
- );
- }
-
- SvREFCNT_dec_NN(cp_list);
- return ret;
- }
- }
-
- /* Here, <cp_list> contains all the code points we can determine at
- * compile time that match under all conditions. Go through it, and
- * for things that belong in the bitmap, put them there, and delete from
- * <cp_list>. While we are at it, see if everything above 255 is in the
- * list, and if so, set a flag to speed up execution */
-
- populate_ANYOF_from_invlist(ret, &cp_list);
-
- if (invert) {
- ANYOF_FLAGS(ret) |= ANYOF_INVERT;
- }
-
- /* Here, the bitmap has been populated with all the Latin1 code points that
- * always match. Can now add to the overall list those that match only
- * when the target string is UTF-8 (<depends_list>). */
- if (depends_list) {
- if (cp_list) {
- _invlist_union(cp_list, depends_list, &cp_list);
- SvREFCNT_dec_NN(depends_list);
- }
- else {
- cp_list = depends_list;
- }
- ANYOF_FLAGS(ret) |= ANYOF_UTF8;
- }
-
- /* If there is a swash and more than one element, we can't use the swash in
- * the optimization below. */
- if (swash && element_count > 1) {
- SvREFCNT_dec_NN(swash);
- swash = NULL;
- }
-
- set_ANYOF_arg(pRExC_state, ret, cp_list,
- (HAS_NONLOCALE_RUNTIME_PROPERTY_DEFINITION)
- ? listsv : NULL,
- only_utf8_locale_list,
- swash, has_user_defined_property);
-
- *flagp |= HASWIDTH|SIMPLE;
-
- if (ANYOF_FLAGS(ret) & ANYOF_LOCALE_FLAGS) {
- RExC_contains_locale = 1;
- }
-
- return ret;
-}
-
-#undef HAS_NONLOCALE_RUNTIME_PROPERTY_DEFINITION
-
-STATIC void
-S_set_ANYOF_arg(pTHX_ RExC_state_t* const pRExC_state,
- regnode* const node,
- SV* const cp_list,
- SV* const runtime_defns,
- SV* const only_utf8_locale_list,
- SV* const swash,
- const bool has_user_defined_property)
-{
- /* Sets the arg field of an ANYOF-type node 'node', using information about
- * the node passed-in. If there is nothing outside the node's bitmap, the
- * arg is set to ANYOF_NONBITMAP_EMPTY. Otherwise, it sets the argument to
- * the count returned by add_data(), having allocated and stored an array,
- * av, that that count references, as follows:
- * av[0] stores the character class description in its textual form.
- * This is used later (regexec.c:Perl_regclass_swash()) to
- * initialize the appropriate swash, and is also useful for dumping
- * the regnode. This is set to &PL_sv_undef if the textual
- * description is not needed at run-time (as happens if the other
- * elements completely define the class)
- * av[1] if &PL_sv_undef, is a placeholder to later contain the swash
- * computed from av[0]. But if no further computation need be done,
- * the swash is stored here now (and av[0] is &PL_sv_undef).
- * av[2] stores the inversion list of code points that match only if the
- * current locale is UTF-8
- * av[3] stores the cp_list inversion list for use in addition or instead
- * of av[0]; used only if cp_list exists and av[1] is &PL_sv_undef.
- * (Otherwise everything needed is already in av[0] and av[1])
- * av[4] is set if any component of the class is from a user-defined
- * property; used only if av[3] exists */
-
- UV n;
-
- PERL_ARGS_ASSERT_SET_ANYOF_ARG;
-
- if (! cp_list && ! runtime_defns && ! only_utf8_locale_list) {
- assert(! (ANYOF_FLAGS(node)
- & (ANYOF_UTF8|ANYOF_NONBITMAP_NON_UTF8)));
- ARG_SET(node, ANYOF_NONBITMAP_EMPTY);
- }
- else {
- AV * const av = newAV();
- SV *rv;
-
- assert(ANYOF_FLAGS(node)
- & (ANYOF_UTF8|ANYOF_NONBITMAP_NON_UTF8|ANYOF_LOC_FOLD));
-
- av_store(av, 0, (runtime_defns)
- ? SvREFCNT_inc(runtime_defns) : &PL_sv_undef);
- if (swash) {
- assert(cp_list);
- av_store(av, 1, swash);
- SvREFCNT_dec_NN(cp_list);
- }
- else {
- av_store(av, 1, &PL_sv_undef);
- if (cp_list) {
- av_store(av, 3, cp_list);
- av_store(av, 4, newSVuv(has_user_defined_property));
- }
- }
-
- if (only_utf8_locale_list) {
- av_store(av, 2, only_utf8_locale_list);
- }
- else {
- av_store(av, 2, &PL_sv_undef);
- }
-
- rv = newRV_noinc(MUTABLE_SV(av));
- n = add_data(pRExC_state, STR_WITH_LEN("s"));
- RExC_rxi->data->data[n] = (void*)rv;
- ARG_SET(node, n);
- }
-}
-
-
-/* reg_skipcomment()
-
- Absorbs an /x style # comment from the input stream,
- returning a pointer to the first character beyond the comment, or if the
- comment terminates the pattern without anything following it, this returns
- one past the final character of the pattern (in other words, RExC_end) and
- sets the REG_RUN_ON_COMMENT_SEEN flag.
-
- Note it's the callers responsibility to ensure that we are
- actually in /x mode
-
-*/
-
-PERL_STATIC_INLINE char*
-S_reg_skipcomment(RExC_state_t *pRExC_state, char* p)
-{
- PERL_ARGS_ASSERT_REG_SKIPCOMMENT;
-
- assert(*p == '#');
-
- while (p < RExC_end) {
- if (*(++p) == '\n') {
- return p+1;
- }
- }
-
- /* we ran off the end of the pattern without ending the comment, so we have
- * to add an \n when wrapping */
- RExC_seen |= REG_RUN_ON_COMMENT_SEEN;
- return p;
-}
-
-/* nextchar()
-
- Advances the parse position, and optionally absorbs
- "whitespace" from the inputstream.
-
- Without /x "whitespace" means (?#...) style comments only,
- with /x this means (?#...) and # comments and whitespace proper.
-
- Returns the RExC_parse point from BEFORE the scan occurs.
-
- This is the /x friendly way of saying RExC_parse++.
-*/
-
-STATIC char*
-S_nextchar(pTHX_ RExC_state_t *pRExC_state)
-{
- char* const retval = RExC_parse++;
-
- PERL_ARGS_ASSERT_NEXTCHAR;
-
- for (;;) {
- if (RExC_end - RExC_parse >= 3
- && *RExC_parse == '('
- && RExC_parse[1] == '?'
- && RExC_parse[2] == '#')
- {
- while (*RExC_parse != ')') {
- if (RExC_parse == RExC_end)
- FAIL("Sequence (?#... not terminated");
- RExC_parse++;
- }
- RExC_parse++;
- continue;
- }
- if (RExC_flags & RXf_PMf_EXTENDED) {
- char * p = regpatws(pRExC_state, RExC_parse,
- TRUE); /* means recognize comments */
- if (p != RExC_parse) {
- RExC_parse = p;
- continue;
- }
- }
- return retval;
- }
-}
-
-/*
-- reg_node - emit a node
-*/
-STATIC regnode * /* Location. */
-S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
-{
- regnode *ptr;
- regnode * const ret = RExC_emit;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REG_NODE;
-
- if (SIZE_ONLY) {
- SIZE_ALIGN(RExC_size);
- RExC_size += 1;
- return(ret);
- }
- if (RExC_emit >= RExC_emit_bound)
- Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d, %p>=%p",
- op, (void*)RExC_emit, (void*)RExC_emit_bound);
-
- NODE_ALIGN_FILL(ret);
- ptr = ret;
- FILL_ADVANCE_NODE(ptr, op);
- REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, (ptr) - 1);
-#ifdef RE_TRACK_PATTERN_OFFSETS
- if (RExC_offsets) { /* MJD */
- MJD_OFFSET_DEBUG(
- ("%s:%d: (op %s) %s %"UVuf" (len %"UVuf") (max %"UVuf").\n",
- "reg_node", __LINE__,
- PL_reg_name[op],
- (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0]
- ? "Overwriting end of array!\n" : "OK",
- (UV)(RExC_emit - RExC_emit_start),
- (UV)(RExC_parse - RExC_start),
- (UV)RExC_offsets[0]));
- Set_Node_Offset(RExC_emit, RExC_parse + (op == END));
- }
-#endif
- RExC_emit = ptr;
- return(ret);
-}
-
-/*
-- reganode - emit a node with an argument
-*/
-STATIC regnode * /* Location. */
-S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
-{
- regnode *ptr;
- regnode * const ret = RExC_emit;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGANODE;
-
- if (SIZE_ONLY) {
- SIZE_ALIGN(RExC_size);
- RExC_size += 2;
- /*
- We can't do this:
-
- assert(2==regarglen[op]+1);
-
- Anything larger than this has to allocate the extra amount.
- If we changed this to be:
-
- RExC_size += (1 + regarglen[op]);
-
- then it wouldn't matter. Its not clear what side effect
- might come from that so its not done so far.
- -- dmq
- */
- return(ret);
- }
- if (RExC_emit >= RExC_emit_bound)
- Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d, %p>=%p",
- op, (void*)RExC_emit, (void*)RExC_emit_bound);
-
- NODE_ALIGN_FILL(ret);
- ptr = ret;
- FILL_ADVANCE_NODE_ARG(ptr, op, arg);
- REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, (ptr) - 2);
-#ifdef RE_TRACK_PATTERN_OFFSETS
- if (RExC_offsets) { /* MJD */
- MJD_OFFSET_DEBUG(
- ("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
- "reganode",
- __LINE__,
- PL_reg_name[op],
- (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0] ?
- "Overwriting end of array!\n" : "OK",
- (UV)(RExC_emit - RExC_emit_start),
- (UV)(RExC_parse - RExC_start),
- (UV)RExC_offsets[0]));
- Set_Cur_Node_Offset;
- }
-#endif
- RExC_emit = ptr;
- return(ret);
-}
-
-/*
-- reguni - emit (if appropriate) a Unicode character
-*/
-PERL_STATIC_INLINE STRLEN
-S_reguni(pTHX_ const RExC_state_t *pRExC_state, UV uv, char* s)
-{
- PERL_ARGS_ASSERT_REGUNI;
-
- return SIZE_ONLY ? UNISKIP(uv) : (uvchr_to_utf8((U8*)s, uv) - (U8*)s);
-}
-
-/*
-- reginsert - insert an operator in front of already-emitted operand
-*
-* Means relocating the operand.
-*/
-STATIC void
-S_reginsert(pTHX_ RExC_state_t *pRExC_state, U8 op, regnode *opnd, U32 depth)
-{
- regnode *src;
- regnode *dst;
- regnode *place;
- const int offset = regarglen[(U8)op];
- const int size = NODE_STEP_REGNODE + offset;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGINSERT;
- PERL_UNUSED_CONTEXT;
- PERL_UNUSED_ARG(depth);
-/* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
- DEBUG_PARSE_FMT("inst"," - %s",PL_reg_name[op]);
- if (SIZE_ONLY) {
- RExC_size += size;
- return;
- }
-
- src = RExC_emit;
- RExC_emit += size;
- dst = RExC_emit;
- if (RExC_open_parens) {
- int paren;
- /*DEBUG_PARSE_FMT("inst"," - %"IVdf, (IV)RExC_npar);*/
- for ( paren=0 ; paren < RExC_npar ; paren++ ) {
- if ( RExC_open_parens[paren] >= opnd ) {
- /*DEBUG_PARSE_FMT("open"," - %d",size);*/
- RExC_open_parens[paren] += size;
- } else {
- /*DEBUG_PARSE_FMT("open"," - %s","ok");*/
- }
- if ( RExC_close_parens[paren] >= opnd ) {
- /*DEBUG_PARSE_FMT("close"," - %d",size);*/
- RExC_close_parens[paren] += size;
- } else {
- /*DEBUG_PARSE_FMT("close"," - %s","ok");*/
- }
- }
- }
-
- while (src > opnd) {
- StructCopy(--src, --dst, regnode);
-#ifdef RE_TRACK_PATTERN_OFFSETS
- if (RExC_offsets) { /* MJD 20010112 */
- MJD_OFFSET_DEBUG(
- ("%s(%d): (op %s) %s copy %"UVuf" -> %"UVuf" (max %"UVuf").\n",
- "reg_insert",
- __LINE__,
- PL_reg_name[op],
- (UV)(dst - RExC_emit_start) > RExC_offsets[0]
- ? "Overwriting end of array!\n" : "OK",
- (UV)(src - RExC_emit_start),
- (UV)(dst - RExC_emit_start),
- (UV)RExC_offsets[0]));
- Set_Node_Offset_To_R(dst-RExC_emit_start, Node_Offset(src));
- Set_Node_Length_To_R(dst-RExC_emit_start, Node_Length(src));
- }
-#endif
- }
-
-
- place = opnd; /* Op node, where operand used to be. */
-#ifdef RE_TRACK_PATTERN_OFFSETS
- if (RExC_offsets) { /* MJD */
- MJD_OFFSET_DEBUG(
- ("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
- "reginsert",
- __LINE__,
- PL_reg_name[op],
- (UV)(place - RExC_emit_start) > RExC_offsets[0]
- ? "Overwriting end of array!\n" : "OK",
- (UV)(place - RExC_emit_start),
- (UV)(RExC_parse - RExC_start),
- (UV)RExC_offsets[0]));
- Set_Node_Offset(place, RExC_parse);
- Set_Node_Length(place, 1);
- }
-#endif
- src = NEXTOPER(place);
- FILL_ADVANCE_NODE(place, op);
- REH_CALL_COMP_NODE_HOOK(pRExC_state->rx, (place) - 1);
- Zero(src, offset, regnode);
-}
-
-/*
-- regtail - set the next-pointer at the end of a node chain of p to val.
-- SEE ALSO: regtail_study
-*/
-/* TODO: All three parms should be const */
-STATIC void
-S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p,
- const regnode *val,U32 depth)
-{
- regnode *scan;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGTAIL;
-#ifndef DEBUGGING
- PERL_UNUSED_ARG(depth);
-#endif
-
- if (SIZE_ONLY)
- return;
-
- /* Find last node. */
- scan = p;
- for (;;) {
- regnode * const temp = regnext(scan);
- DEBUG_PARSE_r({
- SV * const mysv=sv_newmortal();
- DEBUG_PARSE_MSG((scan==p ? "tail" : ""));
- regprop(RExC_rx, mysv, scan, NULL);
- PerlIO_printf(Perl_debug_log, "~ %s (%d) %s %s\n",
- SvPV_nolen_const(mysv), REG_NODE_NUM(scan),
- (temp == NULL ? "->" : ""),
- (temp == NULL ? PL_reg_name[OP(val)] : "")
- );
- });
- if (temp == NULL)
- break;
- scan = temp;
- }
-
- if (reg_off_by_arg[OP(scan)]) {
- ARG_SET(scan, val - scan);
- }
- else {
- NEXT_OFF(scan) = val - scan;
- }
-}
-
-#ifdef DEBUGGING
-/*
-- regtail_study - set the next-pointer at the end of a node chain of p to val.
-- Look for optimizable sequences at the same time.
-- currently only looks for EXACT chains.
-
-This is experimental code. The idea is to use this routine to perform
-in place optimizations on branches and groups as they are constructed,
-with the long term intention of removing optimization from study_chunk so
-that it is purely analytical.
-
-Currently only used when in DEBUG mode. The macro REGTAIL_STUDY() is used
-to control which is which.
-
-*/
-/* TODO: All four parms should be const */
-
-STATIC U8
-S_regtail_study(pTHX_ RExC_state_t *pRExC_state, regnode *p,
- const regnode *val,U32 depth)
-{
- regnode *scan;
- U8 exact = PSEUDO;
-#ifdef EXPERIMENTAL_INPLACESCAN
- I32 min = 0;
-#endif
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGTAIL_STUDY;
-
-
- if (SIZE_ONLY)
- return exact;
-
- /* Find last node. */
-
- scan = p;
- for (;;) {
- regnode * const temp = regnext(scan);
-#ifdef EXPERIMENTAL_INPLACESCAN
- if (PL_regkind[OP(scan)] == EXACT) {
- bool unfolded_multi_char; /* Unexamined in this routine */
- if (join_exact(pRExC_state, scan, &min,
- &unfolded_multi_char, 1, val, depth+1))
- return EXACT;
- }
-#endif
- if ( exact ) {
- switch (OP(scan)) {
- case EXACT:
- case EXACTF:
- case EXACTFA_NO_TRIE:
- case EXACTFA:
- case EXACTFU:
- case EXACTFU_SS:
- case EXACTFL:
- if( exact == PSEUDO )
- exact= OP(scan);
- else if ( exact != OP(scan) )
- exact= 0;
- case NOTHING:
- break;
- default:
- exact= 0;
- }
- }
- DEBUG_PARSE_r({
- SV * const mysv=sv_newmortal();
- DEBUG_PARSE_MSG((scan==p ? "tsdy" : ""));
- regprop(RExC_rx, mysv, scan, NULL);
- PerlIO_printf(Perl_debug_log, "~ %s (%d) -> %s\n",
- SvPV_nolen_const(mysv),
- REG_NODE_NUM(scan),
- PL_reg_name[exact]);
- });
- if (temp == NULL)
- break;
- scan = temp;
- }
- DEBUG_PARSE_r({
- SV * const mysv_val=sv_newmortal();
- DEBUG_PARSE_MSG("");
- regprop(RExC_rx, mysv_val, val, NULL);
- PerlIO_printf(Perl_debug_log,
- "~ attach to %s (%"IVdf") offset to %"IVdf"\n",
- SvPV_nolen_const(mysv_val),
- (IV)REG_NODE_NUM(val),
- (IV)(val - scan)
- );
- });
- if (reg_off_by_arg[OP(scan)]) {
- ARG_SET(scan, val - scan);
- }
- else {
- NEXT_OFF(scan) = val - scan;
- }
-
- return exact;
-}
-#endif
-
-/*
- - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
- */
-#ifdef DEBUGGING
-
-static void
-S_regdump_intflags(pTHX_ const char *lead, const U32 flags)
-{
- int bit;
- int set=0;
-
- ASSUME(REG_INTFLAGS_NAME_SIZE <= sizeof(flags)*8);
-
- for (bit=0; bit<REG_INTFLAGS_NAME_SIZE; bit++) {
- if (flags & (1<<bit)) {
- if (!set++ && lead)
- PerlIO_printf(Perl_debug_log, "%s",lead);
- PerlIO_printf(Perl_debug_log, "%s ",PL_reg_intflags_name[bit]);
- }
- }
- if (lead) {
- if (set)
- PerlIO_printf(Perl_debug_log, "\n");
- else
- PerlIO_printf(Perl_debug_log, "%s[none-set]\n",lead);
- }
-}
-
-static void
-S_regdump_extflags(pTHX_ const char *lead, const U32 flags)
-{
- int bit;
- int set=0;
- regex_charset cs;
-
- ASSUME(REG_EXTFLAGS_NAME_SIZE <= sizeof(flags)*8);
-
- for (bit=0; bit<REG_EXTFLAGS_NAME_SIZE; bit++) {
- if (flags & (1<<bit)) {
- if ((1<<bit) & RXf_PMf_CHARSET) { /* Output separately, below */
- continue;
- }
- if (!set++ && lead)
- PerlIO_printf(Perl_debug_log, "%s",lead);
- PerlIO_printf(Perl_debug_log, "%s ",PL_reg_extflags_name[bit]);
- }
- }
- if ((cs = get_regex_charset(flags)) != REGEX_DEPENDS_CHARSET) {
- if (!set++ && lead) {
- PerlIO_printf(Perl_debug_log, "%s",lead);
- }
- switch (cs) {
- case REGEX_UNICODE_CHARSET:
- PerlIO_printf(Perl_debug_log, "UNICODE");
- break;
- case REGEX_LOCALE_CHARSET:
- PerlIO_printf(Perl_debug_log, "LOCALE");
- break;
- case REGEX_ASCII_RESTRICTED_CHARSET:
- PerlIO_printf(Perl_debug_log, "ASCII-RESTRICTED");
- break;
- case REGEX_ASCII_MORE_RESTRICTED_CHARSET:
- PerlIO_printf(Perl_debug_log, "ASCII-MORE_RESTRICTED");
- break;
- default:
- PerlIO_printf(Perl_debug_log, "UNKNOWN CHARACTER SET");
- break;
- }
- }
- if (lead) {
- if (set)
- PerlIO_printf(Perl_debug_log, "\n");
- else
- PerlIO_printf(Perl_debug_log, "%s[none-set]\n",lead);
- }
-}
-#endif
-
-void
-Perl_regdump(pTHX_ const regexp *r)
-{
-#ifdef DEBUGGING
- SV * const sv = sv_newmortal();
- SV *dsv= sv_newmortal();
- RXi_GET_DECL(r,ri);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGDUMP;
-
- (void)dumpuntil(r, ri->program, ri->program + 1, NULL, NULL, sv, 0, 0);
-
- /* Header fields of interest. */
- if (r->anchored_substr) {
- RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->anchored_substr),
- RE_SV_DUMPLEN(r->anchored_substr), 30);
- PerlIO_printf(Perl_debug_log,
- "anchored %s%s at %"IVdf" ",
- s, RE_SV_TAIL(r->anchored_substr),
- (IV)r->anchored_offset);
- } else if (r->anchored_utf8) {
- RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->anchored_utf8),
- RE_SV_DUMPLEN(r->anchored_utf8), 30);
- PerlIO_printf(Perl_debug_log,
- "anchored utf8 %s%s at %"IVdf" ",
- s, RE_SV_TAIL(r->anchored_utf8),
- (IV)r->anchored_offset);
- }
- if (r->float_substr) {
- RE_PV_QUOTED_DECL(s, 0, dsv, SvPVX_const(r->float_substr),
- RE_SV_DUMPLEN(r->float_substr), 30);
- PerlIO_printf(Perl_debug_log,
- "floating %s%s at %"IVdf"..%"UVuf" ",
- s, RE_SV_TAIL(r->float_substr),
- (IV)r->float_min_offset, (UV)r->float_max_offset);
- } else if (r->float_utf8) {
- RE_PV_QUOTED_DECL(s, 1, dsv, SvPVX_const(r->float_utf8),
- RE_SV_DUMPLEN(r->float_utf8), 30);
- PerlIO_printf(Perl_debug_log,
- "floating utf8 %s%s at %"IVdf"..%"UVuf" ",
- s, RE_SV_TAIL(r->float_utf8),
- (IV)r->float_min_offset, (UV)r->float_max_offset);
- }
- if (r->check_substr || r->check_utf8)
- PerlIO_printf(Perl_debug_log,
- (const char *)
- (r->check_substr == r->float_substr
- && r->check_utf8 == r->float_utf8
- ? "(checking floating" : "(checking anchored"));
- if (r->intflags & PREGf_NOSCAN)
- PerlIO_printf(Perl_debug_log, " noscan");
- if (r->extflags & RXf_CHECK_ALL)
- PerlIO_printf(Perl_debug_log, " isall");
- if (r->check_substr || r->check_utf8)
- PerlIO_printf(Perl_debug_log, ") ");
-
- if (ri->regstclass) {
- regprop(r, sv, ri->regstclass, NULL);
- PerlIO_printf(Perl_debug_log, "stclass %s ", SvPVX_const(sv));
- }
- if (r->intflags & PREGf_ANCH) {
- PerlIO_printf(Perl_debug_log, "anchored");
- if (r->intflags & PREGf_ANCH_BOL)
- PerlIO_printf(Perl_debug_log, "(BOL)");
- if (r->intflags & PREGf_ANCH_MBOL)
- PerlIO_printf(Perl_debug_log, "(MBOL)");
- if (r->intflags & PREGf_ANCH_SBOL)
- PerlIO_printf(Perl_debug_log, "(SBOL)");
- if (r->intflags & PREGf_ANCH_GPOS)
- PerlIO_printf(Perl_debug_log, "(GPOS)");
- PerlIO_putc(Perl_debug_log, ' ');
- }
- if (r->intflags & PREGf_GPOS_SEEN)
- PerlIO_printf(Perl_debug_log, "GPOS:%"UVuf" ", (UV)r->gofs);
- if (r->intflags & PREGf_SKIP)
- PerlIO_printf(Perl_debug_log, "plus ");
- if (r->intflags & PREGf_IMPLICIT)
- PerlIO_printf(Perl_debug_log, "implicit ");
- PerlIO_printf(Perl_debug_log, "minlen %"IVdf" ", (IV)r->minlen);
- if (r->extflags & RXf_EVAL_SEEN)
- PerlIO_printf(Perl_debug_log, "with eval ");
- PerlIO_printf(Perl_debug_log, "\n");
- DEBUG_FLAGS_r({
- regdump_extflags("r->extflags: ",r->extflags);
- regdump_intflags("r->intflags: ",r->intflags);
- });
-#else
- PERL_ARGS_ASSERT_REGDUMP;
- PERL_UNUSED_CONTEXT;
- PERL_UNUSED_ARG(r);
-#endif /* DEBUGGING */
-}
-
-/*
-- regprop - printable representation of opcode, with run time support
-*/
-
-void
-Perl_regprop(pTHX_ const regexp *prog, SV *sv, const regnode *o, const regmatch_info *reginfo)
-{
-#ifdef DEBUGGING
- int k;
-
- /* Should be synchronized with * ANYOF_ #xdefines in regcomp.h */
- static const char * const anyofs[] = {
-#if _CC_WORDCHAR != 0 || _CC_DIGIT != 1 || _CC_ALPHA != 2 || _CC_LOWER != 3 \
- || _CC_UPPER != 4 || _CC_PUNCT != 5 || _CC_PRINT != 6 \
- || _CC_ALPHANUMERIC != 7 || _CC_GRAPH != 8 || _CC_CASED != 9 \
- || _CC_SPACE != 10 || _CC_BLANK != 11 || _CC_XDIGIT != 12 \
- || _CC_PSXSPC != 13 || _CC_CNTRL != 14 || _CC_ASCII != 15 \
- || _CC_VERTSPACE != 16
- #error Need to adjust order of anyofs[]
-#endif
- "\\w",
- "\\W",
- "\\d",
- "\\D",
- "[:alpha:]",
- "[:^alpha:]",
- "[:lower:]",
- "[:^lower:]",
- "[:upper:]",
- "[:^upper:]",
- "[:punct:]",
- "[:^punct:]",
- "[:print:]",
- "[:^print:]",
- "[:alnum:]",
- "[:^alnum:]",
- "[:graph:]",
- "[:^graph:]",
- "[:cased:]",
- "[:^cased:]",
- "\\s",
- "\\S",
- "[:blank:]",
- "[:^blank:]",
- "[:xdigit:]",
- "[:^xdigit:]",
- "[:space:]",
- "[:^space:]",
- "[:cntrl:]",
- "[:^cntrl:]",
- "[:ascii:]",
- "[:^ascii:]",
- "\\v",
- "\\V"
- };
- RXi_GET_DECL(prog,progi);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGPROP;
-
- sv_setpvs(sv, "");
-
- if (OP(o) > REGNODE_MAX) /* regnode.type is unsigned */
- /* It would be nice to FAIL() here, but this may be called from
- regexec.c, and it would be hard to supply pRExC_state. */
- Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d",
- (int)OP(o), (int)REGNODE_MAX);
- sv_catpv(sv, PL_reg_name[OP(o)]); /* Take off const! */
-
- k = PL_regkind[OP(o)];
-
- if (k == EXACT) {
- sv_catpvs(sv, " ");
- /* Using is_utf8_string() (via PERL_PV_UNI_DETECT)
- * is a crude hack but it may be the best for now since
- * we have no flag "this EXACTish node was UTF-8"
- * --jhi */
- pv_pretty(sv, STRING(o), STR_LEN(o), 60, PL_colors[0], PL_colors[1],
- PERL_PV_ESCAPE_UNI_DETECT |
- PERL_PV_ESCAPE_NONASCII |
- PERL_PV_PRETTY_ELLIPSES |
- PERL_PV_PRETTY_LTGT |
- PERL_PV_PRETTY_NOCLEAR
- );
- } else if (k == TRIE) {
- /* print the details of the trie in dumpuntil instead, as
- * progi->data isn't available here */
- const char op = OP(o);
- const U32 n = ARG(o);
- const reg_ac_data * const ac = IS_TRIE_AC(op) ?
- (reg_ac_data *)progi->data->data[n] :
- NULL;
- const reg_trie_data * const trie
- = (reg_trie_data*)progi->data->data[!IS_TRIE_AC(op) ? n : ac->trie];
-
- Perl_sv_catpvf(aTHX_ sv, "-%s",PL_reg_name[o->flags]);
- DEBUG_TRIE_COMPILE_r(
- Perl_sv_catpvf(aTHX_ sv,
- "<S:%"UVuf"/%"IVdf" W:%"UVuf" L:%"UVuf"/%"UVuf" C:%"UVuf"/%"UVuf">",
- (UV)trie->startstate,
- (IV)trie->statecount-1, /* -1 because of the unused 0 element */
- (UV)trie->wordcount,
- (UV)trie->minlen,
- (UV)trie->maxlen,
- (UV)TRIE_CHARCOUNT(trie),
- (UV)trie->uniquecharcount
- );
- );
- if ( IS_ANYOF_TRIE(op) || trie->bitmap ) {
- sv_catpvs(sv, "[");
- (void) put_latin1_charclass_innards(sv, IS_ANYOF_TRIE(op)
- ? ANYOF_BITMAP(o)
- : TRIE_BITMAP(trie));
- sv_catpvs(sv, "]");
- }
-
- } else if (k == CURLY) {
- if (OP(o) == CURLYM || OP(o) == CURLYN || OP(o) == CURLYX)
- Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags); /* Parenth number */
- Perl_sv_catpvf(aTHX_ sv, " {%d,%d}", ARG1(o), ARG2(o));
- }
- else if (k == WHILEM && o->flags) /* Ordinal/of */
- Perl_sv_catpvf(aTHX_ sv, "[%d/%d]", o->flags & 0xf, o->flags>>4);
- else if (k == REF || k == OPEN || k == CLOSE
- || k == GROUPP || OP(o)==ACCEPT)
- {
- Perl_sv_catpvf(aTHX_ sv, "%d", (int)ARG(o)); /* Parenth number */
- if ( RXp_PAREN_NAMES(prog) ) {
- if ( k != REF || (OP(o) < NREF)) {
- AV *list= MUTABLE_AV(progi->data->data[progi->name_list_idx]);
- SV **name= av_fetch(list, ARG(o), 0 );
- if (name)
- Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
- }
- else {
- AV *list= MUTABLE_AV(progi->data->data[ progi->name_list_idx ]);
- SV *sv_dat= MUTABLE_SV(progi->data->data[ ARG( o ) ]);
- I32 *nums=(I32*)SvPVX(sv_dat);
- SV **name= av_fetch(list, nums[0], 0 );
- I32 n;
- if (name) {
- for ( n=0; n<SvIVX(sv_dat); n++ ) {
- Perl_sv_catpvf(aTHX_ sv, "%s%"IVdf,
- (n ? "," : ""), (IV)nums[n]);
- }
- Perl_sv_catpvf(aTHX_ sv, " '%"SVf"'", SVfARG(*name));
- }
- }
- }
- if ( k == REF && reginfo) {
- U32 n = ARG(o); /* which paren pair */
- I32 ln = prog->offs[n].start;
- if (prog->lastparen < n || ln == -1)
- Perl_sv_catpvf(aTHX_ sv, ": FAIL");
- else if (ln == prog->offs[n].end)
- Perl_sv_catpvf(aTHX_ sv, ": ACCEPT - EMPTY STRING");
- else {
- const char *s = reginfo->strbeg + ln;
- Perl_sv_catpvf(aTHX_ sv, ": ");
- Perl_pv_pretty( aTHX_ sv, s, prog->offs[n].end - prog->offs[n].start, 32, 0, 0,
- PERL_PV_ESCAPE_UNI_DETECT|PERL_PV_PRETTY_NOCLEAR|PERL_PV_PRETTY_ELLIPSES|PERL_PV_PRETTY_QUOTE );
- }
- }
- } else if (k == GOSUB)
- /* Paren and offset */
- Perl_sv_catpvf(aTHX_ sv, "%d[%+d]", (int)ARG(o),(int)ARG2L(o));
- else if (k == VERB) {
- if (!o->flags)
- Perl_sv_catpvf(aTHX_ sv, ":%"SVf,
- SVfARG((MUTABLE_SV(progi->data->data[ ARG( o ) ]))));
- } else if (k == LOGICAL)
- /* 2: embedded, otherwise 1 */
- Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags);
- else if (k == ANYOF) {
- const U8 flags = ANYOF_FLAGS(o);
- int do_sep = 0;
-
-
- if (flags & ANYOF_LOCALE_FLAGS)
- sv_catpvs(sv, "{loc}");
- if (flags & ANYOF_LOC_FOLD)
- sv_catpvs(sv, "{i}");
- Perl_sv_catpvf(aTHX_ sv, "[%s", PL_colors[0]);
- if (flags & ANYOF_INVERT)
- sv_catpvs(sv, "^");
-
- /* output what the standard cp 0-255 bitmap matches */
- do_sep = put_latin1_charclass_innards(sv, ANYOF_BITMAP(o));
-
- /* output any special charclass tests (used entirely under use
- * locale) * */
- if (ANYOF_POSIXL_TEST_ANY_SET(o)) {
- int i;
- for (i = 0; i < ANYOF_POSIXL_MAX; i++) {
- if (ANYOF_POSIXL_TEST(o,i)) {
- sv_catpv(sv, anyofs[i]);
- do_sep = 1;
- }
- }
- }
-
- if ((flags & (ANYOF_ABOVE_LATIN1_ALL
- |ANYOF_UTF8
- |ANYOF_NONBITMAP_NON_UTF8
- |ANYOF_LOC_FOLD)))
- {
- if (do_sep) {
- Perl_sv_catpvf(aTHX_ sv,"%s][%s",PL_colors[1],PL_colors[0]);
- if (flags & ANYOF_INVERT)
- /*make sure the invert info is in each */
- sv_catpvs(sv, "^");
- }
-
- if (flags & ANYOF_NON_UTF8_NON_ASCII_ALL) {
- sv_catpvs(sv, "{non-utf8-latin1-all}");
- }
-
- /* output information about the unicode matching */
- if (flags & ANYOF_ABOVE_LATIN1_ALL)
- sv_catpvs(sv, "{unicode_all}");
- else if (ARG(o) != ANYOF_NONBITMAP_EMPTY) {
- SV *lv; /* Set if there is something outside the bit map. */
- bool byte_output = FALSE; /* If something in the bitmap has
- been output */
- SV *only_utf8_locale;
-
- /* Get the stuff that wasn't in the bitmap */
- (void) _get_regclass_nonbitmap_data(prog, o, FALSE,
- &lv, &only_utf8_locale);
- if (lv && lv != &PL_sv_undef) {
- char *s = savesvpv(lv);
- char * const origs = s;
-
- while (*s && *s != '\n')
- s++;
-
- if (*s == '\n') {
- const char * const t = ++s;
-
- if (flags & ANYOF_NONBITMAP_NON_UTF8) {
- sv_catpvs(sv, "{outside bitmap}");
- }
- else {
- sv_catpvs(sv, "{utf8}");
- }
-
- if (byte_output) {
- sv_catpvs(sv, " ");
- }
-
- while (*s) {
- if (*s == '\n') {
-
- /* Truncate very long output */
- if (s - origs > 256) {
- Perl_sv_catpvf(aTHX_ sv,
- "%.*s...",
- (int) (s - origs - 1),
- t);
- goto out_dump;
- }
- *s = ' ';
- }
- else if (*s == '\t') {
- *s = '-';
- }
- s++;
- }
- if (s[-1] == ' ')
- s[-1] = 0;
-
- sv_catpv(sv, t);
- }
-
- out_dump:
-
- Safefree(origs);
- SvREFCNT_dec_NN(lv);
- }
-
- if ((flags & ANYOF_LOC_FOLD)
- && only_utf8_locale
- && only_utf8_locale != &PL_sv_undef)
- {
- UV start, end;
- int max_entries = 256;
-
- sv_catpvs(sv, "{utf8 locale}");
- invlist_iterinit(only_utf8_locale);
- while (invlist_iternext(only_utf8_locale,
- &start, &end)) {
- put_range(sv, start, end);
- max_entries --;
- if (max_entries < 0) {
- sv_catpvs(sv, "...");
- break;
- }
- }
- invlist_iterfinish(only_utf8_locale);
- }
- }
- }
-
- Perl_sv_catpvf(aTHX_ sv, "%s]", PL_colors[1]);
- }
- else if (k == POSIXD || k == NPOSIXD) {
- U8 index = FLAGS(o) * 2;
- if (index < C_ARRAY_LENGTH(anyofs)) {
- if (*anyofs[index] != '[') {
- sv_catpv(sv, "[");
- }
- sv_catpv(sv, anyofs[index]);
- if (*anyofs[index] != '[') {
- sv_catpv(sv, "]");
- }
- }
- else {
- Perl_sv_catpvf(aTHX_ sv, "[illegal type=%d])", index);
- }
- }
- else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
- Perl_sv_catpvf(aTHX_ sv, "[%d]", -(o->flags));
-#else
- PERL_UNUSED_CONTEXT;
- PERL_UNUSED_ARG(sv);
- PERL_UNUSED_ARG(o);
- PERL_UNUSED_ARG(prog);
- PERL_UNUSED_ARG(reginfo);
-#endif /* DEBUGGING */
-}
-
-
-
-SV *
-Perl_re_intuit_string(pTHX_ REGEXP * const r)
-{ /* Assume that RE_INTUIT is set */
- struct regexp *const prog = ReANY(r);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_RE_INTUIT_STRING;
- PERL_UNUSED_CONTEXT;
-
- DEBUG_COMPILE_r(
- {
- const char * const s = SvPV_nolen_const(prog->check_substr
- ? prog->check_substr : prog->check_utf8);
-
- if (!PL_colorset) reginitcolors();
- PerlIO_printf(Perl_debug_log,
- "%sUsing REx %ssubstr:%s \"%s%.60s%s%s\"\n",
- PL_colors[4],
- prog->check_substr ? "" : "utf8 ",
- PL_colors[5],PL_colors[0],
- s,
- PL_colors[1],
- (strlen(s) > 60 ? "..." : ""));
- } );
-
- return prog->check_substr ? prog->check_substr : prog->check_utf8;
-}
-
-/*
- pregfree()
-
- handles refcounting and freeing the perl core regexp structure. When
- it is necessary to actually free the structure the first thing it
- does is call the 'free' method of the regexp_engine associated to
- the regexp, allowing the handling of the void *pprivate; member
- first. (This routine is not overridable by extensions, which is why
- the extensions free is called first.)
-
- See regdupe and regdupe_internal if you change anything here.
-*/
-#ifndef PERL_IN_XSUB_RE
-void
-Perl_pregfree(pTHX_ REGEXP *r)
-{
- SvREFCNT_dec(r);
-}
-
-void
-Perl_pregfree2(pTHX_ REGEXP *rx)
-{
- struct regexp *const r = ReANY(rx);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_PREGFREE2;
-
- if (r->mother_re) {
- ReREFCNT_dec(r->mother_re);
- } else {
- CALLREGFREE_PVT(rx); /* free the private data */
- SvREFCNT_dec(RXp_PAREN_NAMES(r));
- Safefree(r->xpv_len_u.xpvlenu_pv);
- }
- if (r->substrs) {
- SvREFCNT_dec(r->anchored_substr);
- SvREFCNT_dec(r->anchored_utf8);
- SvREFCNT_dec(r->float_substr);
- SvREFCNT_dec(r->float_utf8);
- Safefree(r->substrs);
- }
- RX_MATCH_COPY_FREE(rx);
-#ifdef PERL_ANY_COW
- SvREFCNT_dec(r->saved_copy);
-#endif
- Safefree(r->offs);
- SvREFCNT_dec(r->qr_anoncv);
- rx->sv_u.svu_rx = 0;
-}
-
-/* reg_temp_copy()
-
- This is a hacky workaround to the structural issue of match results
- being stored in the regexp structure which is in turn stored in
- PL_curpm/PL_reg_curpm. The problem is that due to qr// the pattern
- could be PL_curpm in multiple contexts, and could require multiple
- result sets being associated with the pattern simultaneously, such
- as when doing a recursive match with (??{$qr})
-
- The solution is to make a lightweight copy of the regexp structure
- when a qr// is returned from the code executed by (??{$qr}) this
- lightweight copy doesn't actually own any of its data except for
- the starp/end and the actual regexp structure itself.
-
-*/
-
-
-REGEXP *
-Perl_reg_temp_copy (pTHX_ REGEXP *ret_x, REGEXP *rx)
-{
- struct regexp *ret;
- struct regexp *const r = ReANY(rx);
- const bool islv = ret_x && SvTYPE(ret_x) == SVt_PVLV;
-
- PERL_ARGS_ASSERT_REG_TEMP_COPY;
-
- if (!ret_x)
- ret_x = (REGEXP*) newSV_type(SVt_REGEXP);
- else {
- SvOK_off((SV *)ret_x);
- if (islv) {
- /* For PVLVs, SvANY points to the xpvlv body while sv_u points
- to the regexp. (For SVt_REGEXPs, sv_upgrade has already
- made both spots point to the same regexp body.) */
- REGEXP *temp = (REGEXP *)newSV_type(SVt_REGEXP);
- assert(!SvPVX(ret_x));
- ret_x->sv_u.svu_rx = temp->sv_any;
- temp->sv_any = NULL;
- SvFLAGS(temp) = (SvFLAGS(temp) & ~SVTYPEMASK) | SVt_NULL;
- SvREFCNT_dec_NN(temp);
- /* SvCUR still resides in the xpvlv struct, so the regexp copy-
- ing below will not set it. */
- SvCUR_set(ret_x, SvCUR(rx));
- }
- }
- /* This ensures that SvTHINKFIRST(sv) is true, and hence that
- sv_force_normal(sv) is called. */
- SvFAKE_on(ret_x);
- ret = ReANY(ret_x);
-
- SvFLAGS(ret_x) |= SvUTF8(rx);
- /* We share the same string buffer as the original regexp, on which we
- hold a reference count, incremented when mother_re is set below.
- The string pointer is copied here, being part of the regexp struct.
- */
- memcpy(&(ret->xpv_cur), &(r->xpv_cur),
- sizeof(regexp) - STRUCT_OFFSET(regexp, xpv_cur));
- if (r->offs) {
- const I32 npar = r->nparens+1;
- Newx(ret->offs, npar, regexp_paren_pair);
- Copy(r->offs, ret->offs, npar, regexp_paren_pair);
- }
- if (r->substrs) {
- Newx(ret->substrs, 1, struct reg_substr_data);
- StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
-
- SvREFCNT_inc_void(ret->anchored_substr);
- SvREFCNT_inc_void(ret->anchored_utf8);
- SvREFCNT_inc_void(ret->float_substr);
- SvREFCNT_inc_void(ret->float_utf8);
-
- /* check_substr and check_utf8, if non-NULL, point to either their
- anchored or float namesakes, and don't hold a second reference. */
- }
- RX_MATCH_COPIED_off(ret_x);
-#ifdef PERL_ANY_COW
- ret->saved_copy = NULL;
-#endif
- ret->mother_re = ReREFCNT_inc(r->mother_re ? r->mother_re : rx);
- SvREFCNT_inc_void(ret->qr_anoncv);
-
- return ret_x;
-}
-#endif
-
-/* regfree_internal()
-
- Free the private data in a regexp. This is overloadable by
- extensions. Perl takes care of the regexp structure in pregfree(),
- this covers the *pprivate pointer which technically perl doesn't
- know about, however of course we have to handle the
- regexp_internal structure when no extension is in use.
-
- Note this is called before freeing anything in the regexp
- structure.
- */
-
-void
-Perl_regfree_internal(pTHX_ REGEXP * const rx)
-{
- struct regexp *const r = ReANY(rx);
- RXi_GET_DECL(r,ri);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGFREE_INTERNAL;
-
- DEBUG_COMPILE_r({
- if (!PL_colorset)
- reginitcolors();
- {
- SV *dsv= sv_newmortal();
- RE_PV_QUOTED_DECL(s, RX_UTF8(rx),
- dsv, RX_PRECOMP(rx), RX_PRELEN(rx), 60);
- PerlIO_printf(Perl_debug_log,"%sFreeing REx:%s %s\n",
- PL_colors[4],PL_colors[5],s);
- }
- });
-#ifdef RE_TRACK_PATTERN_OFFSETS
- if (ri->u.offsets)
- Safefree(ri->u.offsets); /* 20010421 MJD */
-#endif
- if (ri->code_blocks) {
- int n;
- for (n = 0; n < ri->num_code_blocks; n++)
- SvREFCNT_dec(ri->code_blocks[n].src_regex);
- Safefree(ri->code_blocks);
- }
-
- if (ri->data) {
- int n = ri->data->count;
-
- while (--n >= 0) {
- /* If you add a ->what type here, update the comment in regcomp.h */
- switch (ri->data->what[n]) {
- case 'a':
- case 'r':
- case 's':
- case 'S':
- case 'u':
- SvREFCNT_dec(MUTABLE_SV(ri->data->data[n]));
- break;
- case 'f':
- Safefree(ri->data->data[n]);
- break;
- case 'l':
- case 'L':
- break;
- case 'T':
- { /* Aho Corasick add-on structure for a trie node.
- Used in stclass optimization only */
- U32 refcount;
- reg_ac_data *aho=(reg_ac_data*)ri->data->data[n];
-#ifdef USE_ITHREADS
- dVAR;
-#endif
- OP_REFCNT_LOCK;
- refcount = --aho->refcount;
- OP_REFCNT_UNLOCK;
- if ( !refcount ) {
- PerlMemShared_free(aho->states);
- PerlMemShared_free(aho->fail);
- /* do this last!!!! */
- PerlMemShared_free(ri->data->data[n]);
- /* we should only ever get called once, so
- * assert as much, and also guard the free
- * which /might/ happen twice. At the least
- * it will make code anlyzers happy and it
- * doesn't cost much. - Yves */
- assert(ri->regstclass);
- if (ri->regstclass) {
- PerlMemShared_free(ri->regstclass);
- ri->regstclass = 0;
- }
- }
- }
- break;
- case 't':
- {
- /* trie structure. */
- U32 refcount;
- reg_trie_data *trie=(reg_trie_data*)ri->data->data[n];
-#ifdef USE_ITHREADS
- dVAR;
-#endif
- OP_REFCNT_LOCK;
- refcount = --trie->refcount;
- OP_REFCNT_UNLOCK;
- if ( !refcount ) {
- PerlMemShared_free(trie->charmap);
- PerlMemShared_free(trie->states);
- PerlMemShared_free(trie->trans);
- if (trie->bitmap)
- PerlMemShared_free(trie->bitmap);
- if (trie->jump)
- PerlMemShared_free(trie->jump);
- PerlMemShared_free(trie->wordinfo);
- /* do this last!!!! */
- PerlMemShared_free(ri->data->data[n]);
- }
- }
- break;
- default:
- Perl_croak(aTHX_ "panic: regfree data code '%c'",
- ri->data->what[n]);
- }
- }
- Safefree(ri->data->what);
- Safefree(ri->data);
- }
-
- Safefree(ri);
-}
-
-#define av_dup_inc(s,t) MUTABLE_AV(sv_dup_inc((const SV *)s,t))
-#define hv_dup_inc(s,t) MUTABLE_HV(sv_dup_inc((const SV *)s,t))
-#define SAVEPVN(p,n) ((p) ? savepvn(p,n) : NULL)
-
-/*
- re_dup - duplicate a regexp.
-
- This routine is expected to clone a given regexp structure. It is only
- compiled under USE_ITHREADS.
-
- After all of the core data stored in struct regexp is duplicated
- the regexp_engine.dupe method is used to copy any private data
- stored in the *pprivate pointer. This allows extensions to handle
- any duplication it needs to do.
-
- See pregfree() and regfree_internal() if you change anything here.
-*/
-#if defined(USE_ITHREADS)
-#ifndef PERL_IN_XSUB_RE
-void
-Perl_re_dup_guts(pTHX_ const REGEXP *sstr, REGEXP *dstr, CLONE_PARAMS *param)
-{
- dVAR;
- I32 npar;
- const struct regexp *r = ReANY(sstr);
- struct regexp *ret = ReANY(dstr);
-
- PERL_ARGS_ASSERT_RE_DUP_GUTS;
-
- npar = r->nparens+1;
- Newx(ret->offs, npar, regexp_paren_pair);
- Copy(r->offs, ret->offs, npar, regexp_paren_pair);
-
- if (ret->substrs) {
- /* Do it this way to avoid reading from *r after the StructCopy().
- That way, if any of the sv_dup_inc()s dislodge *r from the L1
- cache, it doesn't matter. */
- const bool anchored = r->check_substr
- ? r->check_substr == r->anchored_substr
- : r->check_utf8 == r->anchored_utf8;
- Newx(ret->substrs, 1, struct reg_substr_data);
- StructCopy(r->substrs, ret->substrs, struct reg_substr_data);
-
- ret->anchored_substr = sv_dup_inc(ret->anchored_substr, param);
- ret->anchored_utf8 = sv_dup_inc(ret->anchored_utf8, param);
- ret->float_substr = sv_dup_inc(ret->float_substr, param);
- ret->float_utf8 = sv_dup_inc(ret->float_utf8, param);
-
- /* check_substr and check_utf8, if non-NULL, point to either their
- anchored or float namesakes, and don't hold a second reference. */
-
- if (ret->check_substr) {
- if (anchored) {
- assert(r->check_utf8 == r->anchored_utf8);
- ret->check_substr = ret->anchored_substr;
- ret->check_utf8 = ret->anchored_utf8;
- } else {
- assert(r->check_substr == r->float_substr);
- assert(r->check_utf8 == r->float_utf8);
- ret->check_substr = ret->float_substr;
- ret->check_utf8 = ret->float_utf8;
- }
- } else if (ret->check_utf8) {
- if (anchored) {
- ret->check_utf8 = ret->anchored_utf8;
- } else {
- ret->check_utf8 = ret->float_utf8;
- }
- }
- }
-
- RXp_PAREN_NAMES(ret) = hv_dup_inc(RXp_PAREN_NAMES(ret), param);
- ret->qr_anoncv = MUTABLE_CV(sv_dup_inc((const SV *)ret->qr_anoncv, param));
-
- if (ret->pprivate)
- RXi_SET(ret,CALLREGDUPE_PVT(dstr,param));
-
- if (RX_MATCH_COPIED(dstr))
- ret->subbeg = SAVEPVN(ret->subbeg, ret->sublen);
- else
- ret->subbeg = NULL;
-#ifdef PERL_ANY_COW
- ret->saved_copy = NULL;
-#endif
-
- /* Whether mother_re be set or no, we need to copy the string. We
- cannot refrain from copying it when the storage points directly to
- our mother regexp, because that's
- 1: a buffer in a different thread
- 2: something we no longer hold a reference on
- so we need to copy it locally. */
- RX_WRAPPED(dstr) = SAVEPVN(RX_WRAPPED(sstr), SvCUR(sstr)+1);
- ret->mother_re = NULL;
-}
-#endif /* PERL_IN_XSUB_RE */
-
-/*
- regdupe_internal()
-
- This is the internal complement to regdupe() which is used to copy
- the structure pointed to by the *pprivate pointer in the regexp.
- This is the core version of the extension overridable cloning hook.
- The regexp structure being duplicated will be copied by perl prior
- to this and will be provided as the regexp *r argument, however
- with the /old/ structures pprivate pointer value. Thus this routine
- may override any copying normally done by perl.
-
- It returns a pointer to the new regexp_internal structure.
-*/
-
-void *
-Perl_regdupe_internal(pTHX_ REGEXP * const rx, CLONE_PARAMS *param)
-{
- dVAR;
- struct regexp *const r = ReANY(rx);
- regexp_internal *reti;
- int len;
- RXi_GET_DECL(r,ri);
-
- PERL_ARGS_ASSERT_REGDUPE_INTERNAL;
-
- len = ProgLen(ri);
-
- Newxc(reti, sizeof(regexp_internal) + len*sizeof(regnode),
- char, regexp_internal);
- Copy(ri->program, reti->program, len+1, regnode);
-
- reti->num_code_blocks = ri->num_code_blocks;
- if (ri->code_blocks) {
- int n;
- Newxc(reti->code_blocks, ri->num_code_blocks, struct reg_code_block,
- struct reg_code_block);
- Copy(ri->code_blocks, reti->code_blocks, ri->num_code_blocks,
- struct reg_code_block);
- for (n = 0; n < ri->num_code_blocks; n++)
- reti->code_blocks[n].src_regex = (REGEXP*)
- sv_dup_inc((SV*)(ri->code_blocks[n].src_regex), param);
- }
- else
- reti->code_blocks = NULL;
-
- reti->regstclass = NULL;
-
- if (ri->data) {
- struct reg_data *d;
- const int count = ri->data->count;
- int i;
-
- Newxc(d, sizeof(struct reg_data) + count*sizeof(void *),
- char, struct reg_data);
- Newx(d->what, count, U8);
-
- d->count = count;
- for (i = 0; i < count; i++) {
- d->what[i] = ri->data->what[i];
- switch (d->what[i]) {
- /* see also regcomp.h and regfree_internal() */
- case 'a': /* actually an AV, but the dup function is identical. */
- case 'r':
- case 's':
- case 'S':
- case 'u': /* actually an HV, but the dup function is identical. */
- d->data[i] = sv_dup_inc((const SV *)ri->data->data[i], param);
- break;
- case 'f':
- /* This is cheating. */
- Newx(d->data[i], 1, regnode_ssc);
- StructCopy(ri->data->data[i], d->data[i], regnode_ssc);
- reti->regstclass = (regnode*)d->data[i];
- break;
- case 'T':
- /* Trie stclasses are readonly and can thus be shared
- * without duplication. We free the stclass in pregfree
- * when the corresponding reg_ac_data struct is freed.
- */
- reti->regstclass= ri->regstclass;
- /* FALLTHROUGH */
- case 't':
- OP_REFCNT_LOCK;
- ((reg_trie_data*)ri->data->data[i])->refcount++;
- OP_REFCNT_UNLOCK;
- /* FALLTHROUGH */
- case 'l':
- case 'L':
- d->data[i] = ri->data->data[i];
- break;
- default:
- Perl_croak(aTHX_ "panic: re_dup unknown data code '%c'",
- ri->data->what[i]);
- }
- }
-
- reti->data = d;
- }
- else
- reti->data = NULL;
-
- reti->name_list_idx = ri->name_list_idx;
-
-#ifdef RE_TRACK_PATTERN_OFFSETS
- if (ri->u.offsets) {
- Newx(reti->u.offsets, 2*len+1, U32);
- Copy(ri->u.offsets, reti->u.offsets, 2*len+1, U32);
- }
-#else
- SetProgLen(reti,len);
-#endif
-
- return (void*)reti;
-}
-
-#endif /* USE_ITHREADS */
-
-#ifndef PERL_IN_XSUB_RE
-
-/*
- - regnext - dig the "next" pointer out of a node
- */
-regnode *
-Perl_regnext(pTHX_ regnode *p)
-{
- I32 offset;
-
- if (!p)
- return(NULL);
-
- if (OP(p) > REGNODE_MAX) { /* regnode.type is unsigned */
- Perl_croak(aTHX_ "Corrupted regexp opcode %d > %d",
- (int)OP(p), (int)REGNODE_MAX);
- }
-
- offset = (reg_off_by_arg[OP(p)] ? ARG(p) : NEXT_OFF(p));
- if (offset == 0)
- return(NULL);
-
- return(p+offset);
-}
-#endif
-
-STATIC void
-S_re_croak2(pTHX_ bool utf8, const char* pat1,const char* pat2,...)
-{
- va_list args;
- STRLEN l1 = strlen(pat1);
- STRLEN l2 = strlen(pat2);
- char buf[512];
- SV *msv;
- const char *message;
-
- PERL_ARGS_ASSERT_RE_CROAK2;
-
- if (l1 > 510)
- l1 = 510;
- if (l1 + l2 > 510)
- l2 = 510 - l1;
- Copy(pat1, buf, l1 , char);
- Copy(pat2, buf + l1, l2 , char);
- buf[l1 + l2] = '\n';
- buf[l1 + l2 + 1] = '\0';
- va_start(args, pat2);
- msv = vmess(buf, &args);
- va_end(args);
- message = SvPV_const(msv,l1);
- if (l1 > 512)
- l1 = 512;
- Copy(message, buf, l1 , char);
- /* l1-1 to avoid \n */
- Perl_croak(aTHX_ "%"UTF8f, UTF8fARG(utf8, l1-1, buf));
-}
-
-/* XXX Here's a total kludge. But we need to re-enter for swash routines. */
-
-#ifndef PERL_IN_XSUB_RE
-void
-Perl_save_re_context(pTHX)
-{
- /* Save $1..$n (#18107: UTF-8 s/(\w+)/uc($1)/e); AMS 20021106. */
- if (PL_curpm) {
- const REGEXP * const rx = PM_GETRE(PL_curpm);
- if (rx) {
- U32 i;
- for (i = 1; i <= RX_NPARENS(rx); i++) {
- char digits[TYPE_CHARS(long)];
- const STRLEN len = my_snprintf(digits, sizeof(digits),
- "%lu", (long)i);
- GV *const *const gvp
- = (GV**)hv_fetch(PL_defstash, digits, len, 0);
-
- if (gvp) {
- GV * const gv = *gvp;
- if (SvTYPE(gv) == SVt_PVGV && GvSV(gv))
- save_scalar(gv);
- }
- }
- }
- }
-}
-#endif
-
-#ifdef DEBUGGING
-
-STATIC void
-S_put_byte(pTHX_ SV *sv, int c)
-{
- PERL_ARGS_ASSERT_PUT_BYTE;
-
- if (!isPRINT(c)) {
- switch (c) {
- case '\r': Perl_sv_catpvf(aTHX_ sv, "\\r"); break;
- case '\n': Perl_sv_catpvf(aTHX_ sv, "\\n"); break;
- case '\t': Perl_sv_catpvf(aTHX_ sv, "\\t"); break;
- case '\f': Perl_sv_catpvf(aTHX_ sv, "\\f"); break;
- case '\a': Perl_sv_catpvf(aTHX_ sv, "\\a"); break;
-
- default:
- Perl_sv_catpvf(aTHX_ sv, "\\x{%x}", c);
- break;
- }
- }
- else {
- const char string = c;
- if (c == '-' || c == ']' || c == '\\' || c == '^')
- sv_catpvs(sv, "\\");
- sv_catpvn(sv, &string, 1);
- }
-}
-
-STATIC void
-S_put_range(pTHX_ SV *sv, UV start, UV end)
-{
-
- /* Appends to 'sv' a displayable version of the range of code points from
- * 'start' to 'end'. It assumes that only ASCII printables are displayable
- * as-is (though some of these will be escaped by put_byte()). For the
- * time being, this subroutine only works for latin1 (< 256) code points */
-
- assert(start <= end);
-
- PERL_ARGS_ASSERT_PUT_RANGE;
-
- while (start <= end) {
- if (end - start < 3) { /* Individual chars in short ranges */
- for (; start <= end; start++) {
- put_byte(sv, start);
- }
- break;
- }
-
- /* For small ranges that include printable ASCII characters, it's more
- * legible to print those characters rather than hex values. For
- * larger ranges that include more than printables, it's probably
- * clearer to just give the start and end points of the range in hex,
- * and that's all we can do if there aren't any printables within the
- * range
- *
- * On ASCII platforms the range of printables is contiguous. If the
- * entire range is printable, we print each character as such. If the
- * range is partially printable and partially not, it's less likely
- * that the individual printables are meaningful, especially if all or
- * almost all of them are in the range. But we err on the side of the
- * individual printables being meaningful by using the hex only if the
- * range contains all but 2 of the printables.
- *
- * On EBCDIC platforms, the printables are scattered around so that the
- * maximum range length containing only them is about 10. Anything
- * longer we treat as hex; otherwise we examine the range character by
- * character to see */
-#ifdef EBCDIC
- if (start < 256 && (((end < 255) ? end : 255) - start <= 10))
-#else
- if ((isPRINT_A(start) && isPRINT_A(end))
- || (end >= 0x7F && (isPRINT_A(start) && start > 0x21))
- || ((end < 0x7D && isPRINT_A(end)) && start < 0x20))
-#endif
- {
- /* If the range beginning isn't an ASCII printable, we find the
- * last such in the range, then split the output, so all the
- * non-printables are in one subrange; then process the remaining
- * portion as usual. If the entire range isn't printables, we
- * don't split, but drop down to print as hex */
- if (! isPRINT_A(start)) {
- UV temp_end = start + 1;
- while (temp_end <= end && ! isPRINT_A(temp_end)) {
- temp_end++;
- }
- if (temp_end <= end) {
- put_range(sv, start, temp_end - 1);
- start = temp_end;
- continue;
- }
- }
-
- /* If the range beginning is a digit, output a subrange of just the
- * digits, then process the remaining portion as usual */
- if (isDIGIT_A(start)) {
- put_byte(sv, start);
- sv_catpvs(sv, "-");
- while (start <= end && isDIGIT_A(start)) start++;
- put_byte(sv, start - 1);
- continue;
- }
-
- /* Similarly for alphabetics. Because in both ASCII and EBCDIC,
- * the code points for upper and lower A-Z and a-z aren't
- * intermixed, the resulting subrange will consist solely of either
- * upper- or lower- alphabetics */
- if (isALPHA_A(start)) {
- put_byte(sv, start);
- sv_catpvs(sv, "-");
- while (start <= end && isALPHA_A(start)) start++;
- put_byte(sv, start - 1);
- continue;
- }
-
- /* We output any remaining printables as individual characters */
- if (isPUNCT_A(start) || isSPACE_A(start)) {
- while (start <= end && (isPUNCT_A(start) || isSPACE_A(start))) {
- put_byte(sv, start);
- start++;
- }
- continue;
- }
- }
-
- /* Here is a control or non-ascii. Output the range or subrange as
- * hex. */
- Perl_sv_catpvf(aTHX_ sv, "\\x{%02" UVXf "}-\\x{%02" UVXf "}",
- start,
- (end < 256) ? end : 255);
- break;
- }
-}
-
-STATIC bool
-S_put_latin1_charclass_innards(pTHX_ SV *sv, char *bitmap)
-{
- /* Appends to 'sv' a displayable version of the innards of the bracketed
- * character class whose bitmap is 'bitmap'; Returns 'TRUE' if it actually
- * output anything */
-
- int i;
- bool has_output_anything = FALSE;
-
- PERL_ARGS_ASSERT_PUT_LATIN1_CHARCLASS_INNARDS;
-
- for (i = 0; i < 256; i++) {
- if (BITMAP_TEST((U8 *) bitmap,i)) {
-
- /* The character at index i should be output. Find the next
- * character that should NOT be output */
- int j;
- for (j = i + 1; j < 256; j++) {
- if (! BITMAP_TEST((U8 *) bitmap, j)) {
- break;
- }
- }
-
- /* Everything between them is a single range that should be output
- * */
- put_range(sv, i, j - 1);
- has_output_anything = TRUE;
- i = j;
- }
- }
-
- return has_output_anything;
-}
-
-#define CLEAR_OPTSTART \
- if (optstart) STMT_START { \
- DEBUG_OPTIMISE_r(PerlIO_printf(Perl_debug_log, \
- " (%"IVdf" nodes)\n", (IV)(node - optstart))); \
- optstart=NULL; \
- } STMT_END
-
-#define DUMPUNTIL(b,e) \
- CLEAR_OPTSTART; \
- node=dumpuntil(r,start,(b),(e),last,sv,indent+1,depth+1);
-
-STATIC const regnode *
-S_dumpuntil(pTHX_ const regexp *r, const regnode *start, const regnode *node,
- const regnode *last, const regnode *plast,
- SV* sv, I32 indent, U32 depth)
-{
- U8 op = PSEUDO; /* Arbitrary non-END op. */
- const regnode *next;
- const regnode *optstart= NULL;
-
- RXi_GET_DECL(r,ri);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_DUMPUNTIL;
-
-#ifdef DEBUG_DUMPUNTIL
- PerlIO_printf(Perl_debug_log, "--- %d : %d - %d - %d\n",indent,node-start,
- last ? last-start : 0,plast ? plast-start : 0);
-#endif
-
- if (plast && plast < last)
- last= plast;
-
- while (PL_regkind[op] != END && (!last || node < last)) {
- assert(node);
- /* While that wasn't END last time... */
- NODE_ALIGN(node);
- op = OP(node);
- if (op == CLOSE || op == WHILEM)
- indent--;
- next = regnext((regnode *)node);
-
- /* Where, what. */
- if (OP(node) == OPTIMIZED) {
- if (!optstart && RE_DEBUG_FLAG(RE_DEBUG_COMPILE_OPTIMISE))
- optstart = node;
- else
- goto after_print;
- } else
- CLEAR_OPTSTART;
-
- regprop(r, sv, node, NULL);
- PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
- (int)(2*indent + 1), "", SvPVX_const(sv));
-
- if (OP(node) != OPTIMIZED) {
- if (next == NULL) /* Next ptr. */
- PerlIO_printf(Perl_debug_log, " (0)");
- else if (PL_regkind[(U8)op] == BRANCH
- && PL_regkind[OP(next)] != BRANCH )
- PerlIO_printf(Perl_debug_log, " (FAIL)");
- else
- PerlIO_printf(Perl_debug_log, " (%"IVdf")", (IV)(next - start));
- (void)PerlIO_putc(Perl_debug_log, '\n');
- }
-
- after_print:
- if (PL_regkind[(U8)op] == BRANCHJ) {
- assert(next);
- {
- const regnode *nnode = (OP(next) == LONGJMP
- ? regnext((regnode *)next)
- : next);
- if (last && nnode > last)
- nnode = last;
- DUMPUNTIL(NEXTOPER(NEXTOPER(node)), nnode);
- }
- }
- else if (PL_regkind[(U8)op] == BRANCH) {
- assert(next);
- DUMPUNTIL(NEXTOPER(node), next);
- }
- else if ( PL_regkind[(U8)op] == TRIE ) {
- const regnode *this_trie = node;
- const char op = OP(node);
- const U32 n = ARG(node);
- const reg_ac_data * const ac = op>=AHOCORASICK ?
- (reg_ac_data *)ri->data->data[n] :
- NULL;
- const reg_trie_data * const trie =
- (reg_trie_data*)ri->data->data[op<AHOCORASICK ? n : ac->trie];
-#ifdef DEBUGGING
- AV *const trie_words
- = MUTABLE_AV(ri->data->data[n + TRIE_WORDS_OFFSET]);
-#endif
- const regnode *nextbranch= NULL;
- I32 word_idx;
- sv_setpvs(sv, "");
- for (word_idx= 0; word_idx < (I32)trie->wordcount; word_idx++) {
- SV ** const elem_ptr = av_fetch(trie_words,word_idx,0);
-
- PerlIO_printf(Perl_debug_log, "%*s%s ",
- (int)(2*(indent+3)), "",
- elem_ptr
- ? pv_pretty(sv, SvPV_nolen_const(*elem_ptr),
- SvCUR(*elem_ptr), 60,
- PL_colors[0], PL_colors[1],
- (SvUTF8(*elem_ptr)
- ? PERL_PV_ESCAPE_UNI
- : 0)
- | PERL_PV_PRETTY_ELLIPSES
- | PERL_PV_PRETTY_LTGT
- )
- : "???"
- );
- if (trie->jump) {
- U16 dist= trie->jump[word_idx+1];
- PerlIO_printf(Perl_debug_log, "(%"UVuf")\n",
- (UV)((dist ? this_trie + dist : next) - start));
- if (dist) {
- if (!nextbranch)
- nextbranch= this_trie + trie->jump[0];
- DUMPUNTIL(this_trie + dist, nextbranch);
- }
- if (nextbranch && PL_regkind[OP(nextbranch)]==BRANCH)
- nextbranch= regnext((regnode *)nextbranch);
- } else {
- PerlIO_printf(Perl_debug_log, "\n");
- }
- }
- if (last && next > last)
- node= last;
- else
- node= next;
- }
- else if ( op == CURLY ) { /* "next" might be very big: optimizer */
- DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS,
- NEXTOPER(node) + EXTRA_STEP_2ARGS + 1);
- }
- else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
- assert(next);
- DUMPUNTIL(NEXTOPER(node) + EXTRA_STEP_2ARGS, next);
- }
- else if ( op == PLUS || op == STAR) {
- DUMPUNTIL(NEXTOPER(node), NEXTOPER(node) + 1);
- }
- else if (PL_regkind[(U8)op] == ANYOF) {
- /* arglen 1 + class block */
- node += 1 + ((ANYOF_FLAGS(node) & ANYOF_POSIXL)
- ? ANYOF_POSIXL_SKIP
- : ANYOF_SKIP);
- node = NEXTOPER(node);
- }
- else if (PL_regkind[(U8)op] == EXACT) {
- /* Literal string, where present. */
- node += NODE_SZ_STR(node) - 1;
- node = NEXTOPER(node);
- }
- else {
- node = NEXTOPER(node);
- node += regarglen[(U8)op];
- }
- if (op == CURLYX || op == OPEN)
- indent++;
- }
- CLEAR_OPTSTART;
-#ifdef DEBUG_DUMPUNTIL
- PerlIO_printf(Perl_debug_log, "--- %d\n", (int)indent);
-#endif
- return node;
-}
-
-#endif /* DEBUGGING */
-
-/*
- * Local variables:
- * c-indentation-style: bsd
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- *
- * ex: set ts=8 sts=4 sw=4 et:
- */
projects / perl / modules / re-engine-Hooks.git / blobdiff