+++ /dev/null
-/* regexec.c
- */
-
-/*
- * One Ring to rule them all, One Ring to find them
- &
- * [p.v of _The Lord of the Rings_, opening poem]
- * [p.50 of _The Lord of the Rings_, I/iii: "The Shadow of the Past"]
- * [p.254 of _The Lord of the Rings_, II/ii: "The Council of Elrond"]
- */
-
-/* This file contains functions for executing a regular expression. See
- * also regcomp.c which funnily enough, contains functions for compiling
- * a regular expression.
- *
- * This file is also copied at build time to ext/re/re_exec.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_REGEXEC_C
-#include "perl.h"
-#include "re_defs.h"
-
-#ifdef PERL_IN_XSUB_RE
-# include "re_comp.h"
-#else
-# include "regcomp.h"
-#endif
-
-#include "inline_invlist.c"
-#include "unicode_constants.h"
-
-#ifdef DEBUGGING
-/* At least one required character in the target string is expressible only in
- * UTF-8. */
-static const char* const non_utf8_target_but_utf8_required
- = "Can't match, because target string needs to be in UTF-8\n";
-#endif
-
-#define NON_UTF8_TARGET_BUT_UTF8_REQUIRED(target) STMT_START { \
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s", non_utf8_target_but_utf8_required));\
- goto target; \
-} STMT_END
-
-#define HAS_NONLATIN1_FOLD_CLOSURE(i) _HAS_NONLATIN1_FOLD_CLOSURE_ONLY_FOR_USE_BY_REGCOMP_DOT_C_AND_REGEXEC_DOT_C(i)
-
-#ifndef STATIC
-#define STATIC static
-#endif
-
-/* Valid only for non-utf8 strings: avoids the reginclass
- * call if there are no complications: i.e., if everything matchable is
- * straight forward in the bitmap */
-#define REGINCLASS(prog,p,c) (ANYOF_FLAGS(p) ? reginclass(prog,p,c,c+1,0) \
- : ANYOF_BITMAP_TEST(p,*(c)))
-
-/*
- * Forwards.
- */
-
-#define CHR_SVLEN(sv) (utf8_target ? sv_len_utf8(sv) : SvCUR(sv))
-#define CHR_DIST(a,b) (reginfo->is_utf8_target ? utf8_distance(a,b) : a - b)
-
-#define HOPc(pos,off) \
- (char *)(reginfo->is_utf8_target \
- ? reghop3((U8*)pos, off, \
- (U8*)(off >= 0 ? reginfo->strend : reginfo->strbeg)) \
- : (U8*)(pos + off))
-
-#define HOPBACKc(pos, off) \
- (char*)(reginfo->is_utf8_target \
- ? reghopmaybe3((U8*)pos, -off, (U8*)(reginfo->strbeg)) \
- : (pos - off >= reginfo->strbeg) \
- ? (U8*)pos - off \
- : NULL)
-
-#define HOP3(pos,off,lim) (reginfo->is_utf8_target ? reghop3((U8*)(pos), off, (U8*)(lim)) : (U8*)(pos + off))
-#define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim))
-
-/* lim must be +ve. Returns NULL on overshoot */
-#define HOPMAYBE3(pos,off,lim) \
- (reginfo->is_utf8_target \
- ? reghopmaybe3((U8*)pos, off, (U8*)(lim)) \
- : ((U8*)pos + off <= lim) \
- ? (U8*)pos + off \
- : NULL)
-
-/* like HOP3, but limits the result to <= lim even for the non-utf8 case.
- * off must be >=0; args should be vars rather than expressions */
-#define HOP3lim(pos,off,lim) (reginfo->is_utf8_target \
- ? reghop3((U8*)(pos), off, (U8*)(lim)) \
- : (U8*)((pos + off) > lim ? lim : (pos + off)))
-
-#define HOP4(pos,off,llim, rlim) (reginfo->is_utf8_target \
- ? reghop4((U8*)(pos), off, (U8*)(llim), (U8*)(rlim)) \
- : (U8*)(pos + off))
-#define HOP4c(pos,off,llim, rlim) ((char*)HOP4(pos,off,llim, rlim))
-
-#define NEXTCHR_EOS -10 /* nextchr has fallen off the end */
-#define NEXTCHR_IS_EOS (nextchr < 0)
-
-#define SET_nextchr \
- nextchr = ((locinput < reginfo->strend) ? UCHARAT(locinput) : NEXTCHR_EOS)
-
-#define SET_locinput(p) \
- locinput = (p); \
- SET_nextchr
-
-
-#define LOAD_UTF8_CHARCLASS(swash_ptr, property_name, invlist) STMT_START { \
- if (!swash_ptr) { \
- U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST; \
- swash_ptr = _core_swash_init("utf8", property_name, &PL_sv_undef, \
- 1, 0, invlist, &flags); \
- assert(swash_ptr); \
- } \
- } STMT_END
-
-/* If in debug mode, we test that a known character properly matches */
-#ifdef DEBUGGING
-# define LOAD_UTF8_CHARCLASS_DEBUG_TEST(swash_ptr, \
- property_name, \
- invlist, \
- utf8_char_in_property) \
- LOAD_UTF8_CHARCLASS(swash_ptr, property_name, invlist); \
- assert(swash_fetch(swash_ptr, (U8 *) utf8_char_in_property, TRUE));
-#else
-# define LOAD_UTF8_CHARCLASS_DEBUG_TEST(swash_ptr, \
- property_name, \
- invlist, \
- utf8_char_in_property) \
- LOAD_UTF8_CHARCLASS(swash_ptr, property_name, invlist)
-#endif
-
-#define LOAD_UTF8_CHARCLASS_ALNUM() LOAD_UTF8_CHARCLASS_DEBUG_TEST( \
- PL_utf8_swash_ptrs[_CC_WORDCHAR], \
- "", \
- PL_XPosix_ptrs[_CC_WORDCHAR], \
- LATIN_CAPITAL_LETTER_SHARP_S_UTF8);
-
-#define LOAD_UTF8_CHARCLASS_GCB() /* Grapheme cluster boundaries */ \
- STMT_START { \
- LOAD_UTF8_CHARCLASS_DEBUG_TEST(PL_utf8_X_regular_begin, \
- "_X_regular_begin", \
- NULL, \
- LATIN_CAPITAL_LETTER_SHARP_S_UTF8); \
- LOAD_UTF8_CHARCLASS_DEBUG_TEST(PL_utf8_X_extend, \
- "_X_extend", \
- NULL, \
- COMBINING_GRAVE_ACCENT_UTF8); \
- } STMT_END
-
-#define PLACEHOLDER /* Something for the preprocessor to grab onto */
-/* TODO: Combine JUMPABLE and HAS_TEXT to cache OP(rn) */
-
-/* for use after a quantifier and before an EXACT-like node -- japhy */
-/* it would be nice to rework regcomp.sym to generate this stuff. sigh
- *
- * NOTE that *nothing* that affects backtracking should be in here, specifically
- * VERBS must NOT be included. JUMPABLE is used to determine if we can ignore a
- * node that is in between two EXACT like nodes when ascertaining what the required
- * "follow" character is. This should probably be moved to regex compile time
- * although it may be done at run time beause of the REF possibility - more
- * investigation required. -- demerphq
-*/
-#define JUMPABLE(rn) ( \
- OP(rn) == OPEN || \
- (OP(rn) == CLOSE && (!cur_eval || cur_eval->u.eval.close_paren != ARG(rn))) || \
- OP(rn) == EVAL || \
- OP(rn) == SUSPEND || OP(rn) == IFMATCH || \
- OP(rn) == PLUS || OP(rn) == MINMOD || \
- OP(rn) == KEEPS || \
- (PL_regkind[OP(rn)] == CURLY && ARG1(rn) > 0) \
-)
-#define IS_EXACT(rn) (PL_regkind[OP(rn)] == EXACT)
-
-#define HAS_TEXT(rn) ( IS_EXACT(rn) || PL_regkind[OP(rn)] == REF )
-
-#if 0
-/* Currently these are only used when PL_regkind[OP(rn)] == EXACT so
- we don't need this definition. */
-#define IS_TEXT(rn) ( OP(rn)==EXACT || OP(rn)==REF || OP(rn)==NREF )
-#define IS_TEXTF(rn) ( OP(rn)==EXACTFU || OP(rn)==EXACTFU_SS || OP(rn)==EXACTFA || OP(rn)==EXACTFA_NO_TRIE || OP(rn)==EXACTF || OP(rn)==REFF || OP(rn)==NREFF )
-#define IS_TEXTFL(rn) ( OP(rn)==EXACTFL || OP(rn)==REFFL || OP(rn)==NREFFL )
-
-#else
-/* ... so we use this as its faster. */
-#define IS_TEXT(rn) ( OP(rn)==EXACT )
-#define IS_TEXTFU(rn) ( OP(rn)==EXACTFU || OP(rn)==EXACTFU_SS || OP(rn) == EXACTFA || OP(rn) == EXACTFA_NO_TRIE)
-#define IS_TEXTF(rn) ( OP(rn)==EXACTF )
-#define IS_TEXTFL(rn) ( OP(rn)==EXACTFL )
-
-#endif
-
-/*
- Search for mandatory following text node; for lookahead, the text must
- follow but for lookbehind (rn->flags != 0) we skip to the next step.
-*/
-#define FIND_NEXT_IMPT(rn) STMT_START { \
- while (JUMPABLE(rn)) { \
- const OPCODE type = OP(rn); \
- if (type == SUSPEND || PL_regkind[type] == CURLY) \
- rn = NEXTOPER(NEXTOPER(rn)); \
- else if (type == PLUS) \
- rn = NEXTOPER(rn); \
- else if (type == IFMATCH) \
- rn = (rn->flags == 0) ? NEXTOPER(NEXTOPER(rn)) : rn + ARG(rn); \
- else rn += NEXT_OFF(rn); \
- } \
-} STMT_END
-
-/* These constants are for finding GCB=LV and GCB=LVT in the CLUMP regnode.
- * These are for the pre-composed Hangul syllables, which are all in a
- * contiguous block and arranged there in such a way so as to facilitate
- * alorithmic determination of their characteristics. As such, they don't need
- * a swash, but can be determined by simple arithmetic. Almost all are
- * GCB=LVT, but every 28th one is a GCB=LV */
-#define SBASE 0xAC00 /* Start of block */
-#define SCount 11172 /* Length of block */
-#define TCount 28
-
-#define SLAB_FIRST(s) (&(s)->states[0])
-#define SLAB_LAST(s) (&(s)->states[PERL_REGMATCH_SLAB_SLOTS-1])
-
-static void S_setup_eval_state(pTHX_ regmatch_info *const reginfo);
-static void S_cleanup_regmatch_info_aux(pTHX_ void *arg);
-static regmatch_state * S_push_slab(pTHX);
-
-#define REGCP_PAREN_ELEMS 3
-#define REGCP_OTHER_ELEMS 3
-#define REGCP_FRAME_ELEMS 1
-/* REGCP_FRAME_ELEMS are not part of the REGCP_OTHER_ELEMS and
- * are needed for the regexp context stack bookkeeping. */
-
-STATIC CHECKPOINT
-S_regcppush(pTHX_ const regexp *rex, I32 parenfloor, U32 maxopenparen)
-{
- dVAR;
- const int retval = PL_savestack_ix;
- const int paren_elems_to_push =
- (maxopenparen - parenfloor) * REGCP_PAREN_ELEMS;
- const UV total_elems = paren_elems_to_push + REGCP_OTHER_ELEMS;
- const UV elems_shifted = total_elems << SAVE_TIGHT_SHIFT;
- I32 p;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGCPPUSH;
-
- if (paren_elems_to_push < 0)
- Perl_croak(aTHX_ "panic: paren_elems_to_push, %i < 0, maxopenparen: %i parenfloor: %i REGCP_PAREN_ELEMS: %u",
- (int)paren_elems_to_push, (int)maxopenparen,
- (int)parenfloor, (unsigned)REGCP_PAREN_ELEMS);
-
- if ((elems_shifted >> SAVE_TIGHT_SHIFT) != total_elems)
- Perl_croak(aTHX_ "panic: paren_elems_to_push offset %"UVuf
- " out of range (%lu-%ld)",
- total_elems,
- (unsigned long)maxopenparen,
- (long)parenfloor);
-
- SSGROW(total_elems + REGCP_FRAME_ELEMS);
-
- DEBUG_BUFFERS_r(
- if ((int)maxopenparen > (int)parenfloor)
- PerlIO_printf(Perl_debug_log,
- "rex=0x%"UVxf" offs=0x%"UVxf": saving capture indices:\n",
- PTR2UV(rex),
- PTR2UV(rex->offs)
- );
- );
- for (p = parenfloor+1; p <= (I32)maxopenparen; p++) {
-/* REGCP_PARENS_ELEMS are pushed per pairs of parentheses. */
- SSPUSHIV(rex->offs[p].end);
- SSPUSHIV(rex->offs[p].start);
- SSPUSHINT(rex->offs[p].start_tmp);
- DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log,
- " \\%"UVuf": %"IVdf"(%"IVdf")..%"IVdf"\n",
- (UV)p,
- (IV)rex->offs[p].start,
- (IV)rex->offs[p].start_tmp,
- (IV)rex->offs[p].end
- ));
- }
-/* REGCP_OTHER_ELEMS are pushed in any case, parentheses or no. */
- SSPUSHINT(maxopenparen);
- SSPUSHINT(rex->lastparen);
- SSPUSHINT(rex->lastcloseparen);
- SSPUSHUV(SAVEt_REGCONTEXT | elems_shifted); /* Magic cookie. */
-
- return retval;
-}
-
-/* These are needed since we do not localize EVAL nodes: */
-#define REGCP_SET(cp) \
- DEBUG_STATE_r( \
- PerlIO_printf(Perl_debug_log, \
- " Setting an EVAL scope, savestack=%"IVdf"\n", \
- (IV)PL_savestack_ix)); \
- cp = PL_savestack_ix
-
-#define REGCP_UNWIND(cp) \
- DEBUG_STATE_r( \
- if (cp != PL_savestack_ix) \
- PerlIO_printf(Perl_debug_log, \
- " Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \
- (IV)(cp), (IV)PL_savestack_ix)); \
- regcpblow(cp)
-
-#define UNWIND_PAREN(lp, lcp) \
- for (n = rex->lastparen; n > lp; n--) \
- rex->offs[n].end = -1; \
- rex->lastparen = n; \
- rex->lastcloseparen = lcp;
-
-
-STATIC void
-S_regcppop(pTHX_ regexp *rex, U32 *maxopenparen_p)
-{
- dVAR;
- UV i;
- U32 paren;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGCPPOP;
-
- /* Pop REGCP_OTHER_ELEMS before the parentheses loop starts. */
- i = SSPOPUV;
- assert((i & SAVE_MASK) == SAVEt_REGCONTEXT); /* Check that the magic cookie is there. */
- i >>= SAVE_TIGHT_SHIFT; /* Parentheses elements to pop. */
- rex->lastcloseparen = SSPOPINT;
- rex->lastparen = SSPOPINT;
- *maxopenparen_p = SSPOPINT;
-
- i -= REGCP_OTHER_ELEMS;
- /* Now restore the parentheses context. */
- DEBUG_BUFFERS_r(
- if (i || rex->lastparen + 1 <= rex->nparens)
- PerlIO_printf(Perl_debug_log,
- "rex=0x%"UVxf" offs=0x%"UVxf": restoring capture indices to:\n",
- PTR2UV(rex),
- PTR2UV(rex->offs)
- );
- );
- paren = *maxopenparen_p;
- for ( ; i > 0; i -= REGCP_PAREN_ELEMS) {
- SSize_t tmps;
- rex->offs[paren].start_tmp = SSPOPINT;
- rex->offs[paren].start = SSPOPIV;
- tmps = SSPOPIV;
- if (paren <= rex->lastparen)
- rex->offs[paren].end = tmps;
- DEBUG_BUFFERS_r( PerlIO_printf(Perl_debug_log,
- " \\%"UVuf": %"IVdf"(%"IVdf")..%"IVdf"%s\n",
- (UV)paren,
- (IV)rex->offs[paren].start,
- (IV)rex->offs[paren].start_tmp,
- (IV)rex->offs[paren].end,
- (paren > rex->lastparen ? "(skipped)" : ""));
- );
- paren--;
- }
-#if 1
- /* It would seem that the similar code in regtry()
- * already takes care of this, and in fact it is in
- * a better location to since this code can #if 0-ed out
- * but the code in regtry() is needed or otherwise tests
- * requiring null fields (pat.t#187 and split.t#{13,14}
- * (as of patchlevel 7877) will fail. Then again,
- * this code seems to be necessary or otherwise
- * this erroneously leaves $1 defined: "1" =~ /^(?:(\d)x)?\d$/
- * --jhi updated by dapm */
- for (i = rex->lastparen + 1; i <= rex->nparens; i++) {
- if (i > *maxopenparen_p)
- rex->offs[i].start = -1;
- rex->offs[i].end = -1;
- DEBUG_BUFFERS_r( PerlIO_printf(Perl_debug_log,
- " \\%"UVuf": %s ..-1 undeffing\n",
- (UV)i,
- (i > *maxopenparen_p) ? "-1" : " "
- ));
- }
-#endif
-}
-
-/* restore the parens and associated vars at savestack position ix,
- * but without popping the stack */
-
-STATIC void
-S_regcp_restore(pTHX_ regexp *rex, I32 ix, U32 *maxopenparen_p)
-{
- I32 tmpix = PL_savestack_ix;
- PL_savestack_ix = ix;
- regcppop(rex, maxopenparen_p);
- PL_savestack_ix = tmpix;
-}
-
-#define regcpblow(cp) LEAVE_SCOPE(cp) /* Ignores regcppush()ed data. */
-
-STATIC bool
-S_isFOO_lc(pTHX_ const U8 classnum, const U8 character)
-{
- /* Returns a boolean as to whether or not 'character' is a member of the
- * Posix character class given by 'classnum' that should be equivalent to a
- * value in the typedef '_char_class_number'.
- *
- * Ideally this could be replaced by a just an array of function pointers
- * to the C library functions that implement the macros this calls.
- * However, to compile, the precise function signatures are required, and
- * these may vary from platform to to platform. To avoid having to figure
- * out what those all are on each platform, I (khw) am using this method,
- * which adds an extra layer of function call overhead (unless the C
- * optimizer strips it away). But we don't particularly care about
- * performance with locales anyway. */
-
- switch ((_char_class_number) classnum) {
- case _CC_ENUM_ALPHANUMERIC: return isALPHANUMERIC_LC(character);
- case _CC_ENUM_ALPHA: return isALPHA_LC(character);
- case _CC_ENUM_ASCII: return isASCII_LC(character);
- case _CC_ENUM_BLANK: return isBLANK_LC(character);
- case _CC_ENUM_CASED: return isLOWER_LC(character)
- || isUPPER_LC(character);
- case _CC_ENUM_CNTRL: return isCNTRL_LC(character);
- case _CC_ENUM_DIGIT: return isDIGIT_LC(character);
- case _CC_ENUM_GRAPH: return isGRAPH_LC(character);
- case _CC_ENUM_LOWER: return isLOWER_LC(character);
- case _CC_ENUM_PRINT: return isPRINT_LC(character);
- case _CC_ENUM_PSXSPC: return isPSXSPC_LC(character);
- case _CC_ENUM_PUNCT: return isPUNCT_LC(character);
- case _CC_ENUM_SPACE: return isSPACE_LC(character);
- case _CC_ENUM_UPPER: return isUPPER_LC(character);
- case _CC_ENUM_WORDCHAR: return isWORDCHAR_LC(character);
- case _CC_ENUM_XDIGIT: return isXDIGIT_LC(character);
- default: /* VERTSPACE should never occur in locales */
- Perl_croak(aTHX_ "panic: isFOO_lc() has an unexpected character class '%d'", classnum);
- }
-
- assert(0); /* NOTREACHED */
- return FALSE;
-}
-
-STATIC bool
-S_isFOO_utf8_lc(pTHX_ const U8 classnum, const U8* character)
-{
- /* Returns a boolean as to whether or not the (well-formed) UTF-8-encoded
- * 'character' is a member of the Posix character class given by 'classnum'
- * that should be equivalent to a value in the typedef
- * '_char_class_number'.
- *
- * This just calls isFOO_lc on the code point for the character if it is in
- * the range 0-255. Outside that range, all characters avoid Unicode
- * rules, ignoring any locale. So use the Unicode function if this class
- * requires a swash, and use the Unicode macro otherwise. */
-
- PERL_ARGS_ASSERT_ISFOO_UTF8_LC;
-
- if (UTF8_IS_INVARIANT(*character)) {
- return isFOO_lc(classnum, *character);
- }
- else if (UTF8_IS_DOWNGRADEABLE_START(*character)) {
- return isFOO_lc(classnum,
- TWO_BYTE_UTF8_TO_NATIVE(*character, *(character + 1)));
- }
-
- if (classnum < _FIRST_NON_SWASH_CC) {
-
- /* Initialize the swash unless done already */
- if (! PL_utf8_swash_ptrs[classnum]) {
- U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
- PL_utf8_swash_ptrs[classnum] =
- _core_swash_init("utf8",
- "",
- &PL_sv_undef, 1, 0,
- PL_XPosix_ptrs[classnum], &flags);
- }
-
- return cBOOL(swash_fetch(PL_utf8_swash_ptrs[classnum], (U8 *)
- character,
- TRUE /* is UTF */ ));
- }
-
- switch ((_char_class_number) classnum) {
- case _CC_ENUM_SPACE:
- case _CC_ENUM_PSXSPC: return is_XPERLSPACE_high(character);
-
- case _CC_ENUM_BLANK: return is_HORIZWS_high(character);
- case _CC_ENUM_XDIGIT: return is_XDIGIT_high(character);
- case _CC_ENUM_VERTSPACE: return is_VERTWS_high(character);
- default: return 0; /* Things like CNTRL are always
- below 256 */
- }
-
- assert(0); /* NOTREACHED */
- return FALSE;
-}
-
-/*
- * pregexec and friends
- */
-
-#ifndef PERL_IN_XSUB_RE
-/*
- - pregexec - match a regexp against a string
- */
-I32
-Perl_pregexec(pTHX_ REGEXP * const prog, char* stringarg, char *strend,
- char *strbeg, SSize_t minend, SV *screamer, U32 nosave)
-/* stringarg: the point in the string at which to begin matching */
-/* strend: pointer to null at end of string */
-/* strbeg: real beginning of string */
-/* minend: end of match must be >= minend bytes after stringarg. */
-/* screamer: SV being matched: only used for utf8 flag, pos() etc; string
- * itself is accessed via the pointers above */
-/* nosave: For optimizations. */
-{
- PERL_ARGS_ASSERT_PREGEXEC;
-
- return
- regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL,
- nosave ? 0 : REXEC_COPY_STR);
-}
-#endif
-
-
-
-/* re_intuit_start():
- *
- * Based on some optimiser hints, try to find the earliest position in the
- * string where the regex could match.
- *
- * rx: the regex to match against
- * sv: the SV being matched: only used for utf8 flag; the string
- * itself is accessed via the pointers below. Note that on
- * something like an overloaded SV, SvPOK(sv) may be false
- * and the string pointers may point to something unrelated to
- * the SV itself.
- * strbeg: real beginning of string
- * strpos: the point in the string at which to begin matching
- * strend: pointer to the byte following the last char of the string
- * flags currently unused; set to 0
- * data: currently unused; set to NULL
- *
- * The basic idea of re_intuit_start() is to use some known information
- * about the pattern, namely:
- *
- * a) the longest known anchored substring (i.e. one that's at a
- * constant offset from the beginning of the pattern; but not
- * necessarily at a fixed offset from the beginning of the
- * string);
- * b) the longest floating substring (i.e. one that's not at a constant
- * offset from the beginning of the pattern);
- * c) Whether the pattern is anchored to the string; either
- * an absolute anchor: /^../, or anchored to \n: /^.../m,
- * or anchored to pos(): /\G/;
- * d) A start class: a real or synthetic character class which
- * represents which characters are legal at the start of the pattern;
- *
- * to either quickly reject the match, or to find the earliest position
- * within the string at which the pattern might match, thus avoiding
- * running the full NFA engine at those earlier locations, only to
- * eventually fail and retry further along.
- *
- * Returns NULL if the pattern can't match, or returns the address within
- * the string which is the earliest place the match could occur.
- *
- * The longest of the anchored and floating substrings is called 'check'
- * and is checked first. The other is called 'other' and is checked
- * second. The 'other' substring may not be present. For example,
- *
- * /(abc|xyz)ABC\d{0,3}DEFG/
- *
- * will have
- *
- * check substr (float) = "DEFG", offset 6..9 chars
- * other substr (anchored) = "ABC", offset 3..3 chars
- * stclass = [ax]
- *
- * Be aware that during the course of this function, sometimes 'anchored'
- * refers to a substring being anchored relative to the start of the
- * pattern, and sometimes to the pattern itself being anchored relative to
- * the string. For example:
- *
- * /\dabc/: "abc" is anchored to the pattern;
- * /^\dabc/: "abc" is anchored to the pattern and the string;
- * /\d+abc/: "abc" is anchored to neither the pattern nor the string;
- * /^\d+abc/: "abc" is anchored to neither the pattern nor the string,
- * but the pattern is anchored to the string.
- */
-
-char *
-Perl_re_intuit_start(pTHX_
- REGEXP * const rx,
- SV *sv,
- const char * const strbeg,
- char *strpos,
- char *strend,
- const U32 flags,
- re_scream_pos_data *data)
-{
- dVAR;
- struct regexp *const prog = ReANY(rx);
- SSize_t start_shift = prog->check_offset_min;
- /* Should be nonnegative! */
- SSize_t end_shift = 0;
- /* current lowest pos in string where the regex can start matching */
- char *rx_origin = strpos;
- SV *check;
- const bool utf8_target = (sv && SvUTF8(sv)) ? 1 : 0; /* if no sv we have to assume bytes */
- U8 other_ix = 1 - prog->substrs->check_ix;
- bool ml_anch = 0;
- char *other_last = strpos;/* latest pos 'other' substr already checked to */
- char *check_at = NULL; /* check substr found at this pos */
- const I32 multiline = prog->extflags & RXf_PMf_MULTILINE;
- RXi_GET_DECL(prog,progi);
- regmatch_info reginfo_buf; /* create some info to pass to find_byclass */
- regmatch_info *const reginfo = ®info_buf;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_RE_INTUIT_START;
- PERL_UNUSED_ARG(flags);
- PERL_UNUSED_ARG(data);
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "Intuit: trying to determine minimum start position...\n"));
-
- /* for now, assume that all substr offsets are positive. If at some point
- * in the future someone wants to do clever things with look-behind and
- * -ve offsets, they'll need to fix up any code in this function
- * which uses these offsets. See the thread beginning
- * <20140113145929.GF27210@iabyn.com>
- */
- assert(prog->substrs->data[0].min_offset >= 0);
- assert(prog->substrs->data[0].max_offset >= 0);
- assert(prog->substrs->data[1].min_offset >= 0);
- assert(prog->substrs->data[1].max_offset >= 0);
- assert(prog->substrs->data[2].min_offset >= 0);
- assert(prog->substrs->data[2].max_offset >= 0);
-
- /* for now, assume that if both present, that the floating substring
- * doesn't start before the anchored substring.
- * If you break this assumption (e.g. doing better optimisations
- * with lookahead/behind), then you'll need to audit the code in this
- * function carefully first
- */
- assert(
- ! ( (prog->anchored_utf8 || prog->anchored_substr)
- && (prog->float_utf8 || prog->float_substr))
- || (prog->float_min_offset >= prog->anchored_offset));
-
- /* byte rather than char calculation for efficiency. It fails
- * to quickly reject some cases that can't match, but will reject
- * them later after doing full char arithmetic */
- if (prog->minlen > strend - strpos) {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " String too short...\n"));
- goto fail;
- }
-
- reginfo->is_utf8_target = cBOOL(utf8_target);
- reginfo->info_aux = NULL;
- reginfo->strbeg = strbeg;
- reginfo->strend = strend;
- reginfo->is_utf8_pat = cBOOL(RX_UTF8(rx));
- reginfo->intuit = 1;
- /* not actually used within intuit, but zero for safety anyway */
- reginfo->poscache_maxiter = 0;
-
- if (utf8_target) {
- if (!prog->check_utf8 && prog->check_substr)
- to_utf8_substr(prog);
- check = prog->check_utf8;
- } else {
- if (!prog->check_substr && prog->check_utf8) {
- if (! to_byte_substr(prog)) {
- NON_UTF8_TARGET_BUT_UTF8_REQUIRED(fail);
- }
- }
- check = prog->check_substr;
- }
-
- /* dump the various substring data */
- DEBUG_OPTIMISE_MORE_r({
- int i;
- for (i=0; i<=2; i++) {
- SV *sv = (utf8_target ? prog->substrs->data[i].utf8_substr
- : prog->substrs->data[i].substr);
- if (!sv)
- continue;
-
- PerlIO_printf(Perl_debug_log,
- " substrs[%d]: min=%"IVdf" max=%"IVdf" end shift=%"IVdf
- " useful=%"IVdf" utf8=%d [%s]\n",
- i,
- (IV)prog->substrs->data[i].min_offset,
- (IV)prog->substrs->data[i].max_offset,
- (IV)prog->substrs->data[i].end_shift,
- BmUSEFUL(sv),
- utf8_target ? 1 : 0,
- SvPEEK(sv));
- }
- });
-
- if (prog->intflags & PREGf_ANCH) { /* Match at \G, beg-of-str or after \n */
-
- /* ml_anch: check after \n?
- *
- * A note about IMPLICIT: on an un-anchored pattern beginning
- * with /.*.../, these flags will have been added by the
- * compiler:
- * /.*abc/, /.*abc/m: PREGf_IMPLICIT | PREGf_ANCH_MBOL
- * /.*abc/s: PREGf_IMPLICIT | PREGf_ANCH_SBOL
- */
- ml_anch = (prog->intflags & PREGf_ANCH_MBOL)
- && !(prog->intflags & PREGf_IMPLICIT);
-
- if (!ml_anch && !(prog->intflags & PREGf_IMPLICIT)) {
- /* we are only allowed to match at BOS or \G */
-
- /* trivially reject if there's a BOS anchor and we're not at BOS.
- *
- * Note that we don't try to do a similar quick reject for
- * \G, since generally the caller will have calculated strpos
- * based on pos() and gofs, so the string is already correctly
- * anchored by definition; and handling the exceptions would
- * be too fiddly (e.g. REXEC_IGNOREPOS).
- */
- if ( strpos != strbeg
- && (prog->intflags & (PREGf_ANCH_BOL|PREGf_ANCH_SBOL)))
- {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " Not at start...\n"));
- goto fail;
- }
-
- /* in the presence of an anchor, the anchored (relative to the
- * start of the regex) substr must also be anchored relative
- * to strpos. So quickly reject if substr isn't found there.
- * This works for \G too, because the caller will already have
- * subtracted gofs from pos, and gofs is the offset from the
- * \G to the start of the regex. For example, in /.abc\Gdef/,
- * where substr="abcdef", pos()=3, gofs=4, offset_min=1:
- * caller will have set strpos=pos()-4; we look for the substr
- * at position pos()-4+1, which lines up with the "a" */
-
- if (prog->check_offset_min == prog->check_offset_max
- && !(prog->intflags & PREGf_CANY_SEEN))
- {
- /* Substring at constant offset from beg-of-str... */
- SSize_t slen = SvCUR(check);
- char *s = HOP3c(strpos, prog->check_offset_min, strend);
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " Looking for check substr at fixed offset %"IVdf"...\n",
- (IV)prog->check_offset_min));
-
- if (SvTAIL(check)) {
- /* In this case, the regex is anchored at the end too.
- * Unless it's a multiline match, the lengths must match
- * exactly, give or take a \n. NB: slen >= 1 since
- * the last char of check is \n */
- if (!multiline
- && ( strend - s > slen
- || strend - s < slen - 1
- || (strend - s == slen && strend[-1] != '\n')))
- {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " String too long...\n"));
- goto fail_finish;
- }
- /* Now should match s[0..slen-2] */
- slen--;
- }
- if (slen && (*SvPVX_const(check) != *s
- || (slen > 1 && memNE(SvPVX_const(check), s, slen))))
- {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " String not equal...\n"));
- goto fail_finish;
- }
-
- check_at = s;
- goto success_at_start;
- }
- }
- }
-
- end_shift = prog->check_end_shift;
-
-#ifdef DEBUGGING /* 7/99: reports of failure (with the older version) */
- if (end_shift < 0)
- Perl_croak(aTHX_ "panic: end_shift: %"IVdf" pattern:\n%s\n ",
- (IV)end_shift, RX_PRECOMP(prog));
-#endif
-
- restart:
-
- /* This is the (re)entry point of the main loop in this function.
- * The goal of this loop is to:
- * 1) find the "check" substring in the region rx_origin..strend
- * (adjusted by start_shift / end_shift). If not found, reject
- * immediately.
- * 2) If it exists, look for the "other" substr too if defined; for
- * example, if the check substr maps to the anchored substr, then
- * check the floating substr, and vice-versa. If not found, go
- * back to (1) with rx_origin suitably incremented.
- * 3) If we find an rx_origin position that doesn't contradict
- * either of the substrings, then check the possible additional
- * constraints on rx_origin of /^.../m or a known start class.
- * If these fail, then depending on which constraints fail, jump
- * back to here, or to various other re-entry points further along
- * that skip some of the first steps.
- * 4) If we pass all those tests, update the BmUSEFUL() count on the
- * substring. If the start position was determined to be at the
- * beginning of the string - so, not rejected, but not optimised,
- * since we have to run regmatch from position 0 - decrement the
- * BmUSEFUL() count. Otherwise increment it.
- */
-
-
- /* first, look for the 'check' substring */
-
- {
- U8* start_point;
- U8* end_point;
-
- DEBUG_OPTIMISE_MORE_r({
- PerlIO_printf(Perl_debug_log,
- " At restart: rx_origin=%"IVdf" Check offset min: %"IVdf
- " Start shift: %"IVdf" End shift %"IVdf
- " Real end Shift: %"IVdf"\n",
- (IV)(rx_origin - strpos),
- (IV)prog->check_offset_min,
- (IV)start_shift,
- (IV)end_shift,
- (IV)prog->check_end_shift);
- });
-
- if (prog->intflags & PREGf_CANY_SEEN) {
- start_point= (U8*)(rx_origin + start_shift);
- end_point= (U8*)(strend - end_shift);
- if (start_point > end_point)
- goto fail_finish;
- } else {
- end_point = HOP3(strend, -end_shift, strbeg);
- start_point = HOPMAYBE3(rx_origin, start_shift, end_point);
- if (!start_point)
- goto fail_finish;
- }
-
-
- /* If the regex is absolutely anchored to either the start of the
- * string (BOL,SBOL) or to pos() (ANCH_GPOS), then
- * check_offset_max represents an upper bound on the string where
- * the substr could start. For the ANCH_GPOS case, we assume that
- * the caller of intuit will have already set strpos to
- * pos()-gofs, so in this case strpos + offset_max will still be
- * an upper bound on the substr.
- */
- if (!ml_anch
- && prog->intflags & PREGf_ANCH
- && prog->check_offset_max != SSize_t_MAX)
- {
- SSize_t len = SvCUR(check) - !!SvTAIL(check);
- const char * const anchor =
- (prog->intflags & PREGf_ANCH_GPOS ? strpos : strbeg);
-
- /* do a bytes rather than chars comparison. It's conservative;
- * so it skips doing the HOP if the result can't possibly end
- * up earlier than the old value of end_point.
- */
- if ((char*)end_point - anchor > prog->check_offset_max) {
- end_point = HOP3lim((U8*)anchor,
- prog->check_offset_max,
- end_point -len)
- + len;
- }
- }
-
- DEBUG_OPTIMISE_MORE_r({
- PerlIO_printf(Perl_debug_log, " fbm_instr len=%d str=<%.*s>\n",
- (int)(end_point - start_point),
- (int)(end_point - start_point) > 20 ? 20 : (int)(end_point - start_point),
- start_point);
- });
-
- check_at = fbm_instr( start_point, end_point,
- check, multiline ? FBMrf_MULTILINE : 0);
-
- /* Update the count-of-usability, remove useless subpatterns,
- unshift s. */
-
- DEBUG_EXECUTE_r({
- RE_PV_QUOTED_DECL(quoted, utf8_target, PERL_DEBUG_PAD_ZERO(0),
- SvPVX_const(check), RE_SV_DUMPLEN(check), 30);
- PerlIO_printf(Perl_debug_log, " %s %s substr %s%s%s",
- (check_at ? "Found" : "Did not find"),
- (check == (utf8_target ? prog->anchored_utf8 : prog->anchored_substr)
- ? "anchored" : "floating"),
- quoted,
- RE_SV_TAIL(check),
- (check_at ? " at offset " : "...\n") );
- });
-
- if (!check_at)
- goto fail_finish;
- /* Finish the diagnostic message */
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%ld...\n", (long)(check_at - strpos)) );
-
- /* set rx_origin to the minimum position where the regex could start
- * matching, given the constraint of the just-matched check substring.
- * But don't set it lower than previously.
- */
-
- if (check_at - rx_origin > prog->check_offset_max)
- rx_origin = HOP3c(check_at, -prog->check_offset_max, rx_origin);
- }
-
-
- /* now look for the 'other' substring if defined */
-
- if (utf8_target ? prog->substrs->data[other_ix].utf8_substr
- : prog->substrs->data[other_ix].substr)
- {
- /* Take into account the "other" substring. */
- char *last, *last1;
- char *s;
- SV* must;
- struct reg_substr_datum *other;
-
- do_other_substr:
- other = &prog->substrs->data[other_ix];
-
- /* if "other" is anchored:
- * we've previously found a floating substr starting at check_at.
- * This means that the regex origin must lie somewhere
- * between min (rx_origin): HOP3(check_at, -check_offset_max)
- * and max: HOP3(check_at, -check_offset_min)
- * (except that min will be >= strpos)
- * So the fixed substr must lie somewhere between
- * HOP3(min, anchored_offset)
- * HOP3(max, anchored_offset) + SvCUR(substr)
- */
-
- /* if "other" is floating
- * Calculate last1, the absolute latest point where the
- * floating substr could start in the string, ignoring any
- * constraints from the earlier fixed match. It is calculated
- * as follows:
- *
- * strend - prog->minlen (in chars) is the absolute latest
- * position within the string where the origin of the regex
- * could appear. The latest start point for the floating
- * substr is float_min_offset(*) on from the start of the
- * regex. last1 simply combines thee two offsets.
- *
- * (*) You might think the latest start point should be
- * float_max_offset from the regex origin, and technically
- * you'd be correct. However, consider
- * /a\d{2,4}bcd\w/
- * Here, float min, max are 3,5 and minlen is 7.
- * This can match either
- * /a\d\dbcd\w/
- * /a\d\d\dbcd\w/
- * /a\d\d\d\dbcd\w/
- * In the first case, the regex matches minlen chars; in the
- * second, minlen+1, in the third, minlen+2.
- * In the first case, the floating offset is 3 (which equals
- * float_min), in the second, 4, and in the third, 5 (which
- * equals float_max). In all cases, the floating string bcd
- * can never start more than 4 chars from the end of the
- * string, which equals minlen - float_min. As the substring
- * starts to match more than float_min from the start of the
- * regex, it makes the regex match more than minlen chars,
- * and the two cancel each other out. So we can always use
- * float_min - minlen, rather than float_max - minlen for the
- * latest position in the string.
- *
- * Note that -minlen + float_min_offset is equivalent (AFAIKT)
- * to CHR_SVLEN(must) - !!SvTAIL(must) + prog->float_end_shift
- */
-
- assert(prog->minlen >= other->min_offset);
- last1 = HOP3c(strend,
- other->min_offset - prog->minlen, strbeg);
-
- if (other_ix) {/* i.e. if (other-is-float) */
- /* last is the latest point where the floating substr could
- * start, *given* any constraints from the earlier fixed
- * match. This constraint is that the floating string starts
- * <= float_max_offset chars from the regex origin (rx_origin).
- * If this value is less than last1, use it instead.
- */
- assert(rx_origin <= last1);
- last =
- /* this condition handles the offset==infinity case, and
- * is a short-cut otherwise. Although it's comparing a
- * byte offset to a char length, it does so in a safe way,
- * since 1 char always occupies 1 or more bytes,
- * so if a string range is (last1 - rx_origin) bytes,
- * it will be less than or equal to (last1 - rx_origin)
- * chars; meaning it errs towards doing the accurate HOP3
- * rather than just using last1 as a short-cut */
- (last1 - rx_origin) < other->max_offset
- ? last1
- : (char*)HOP3lim(rx_origin, other->max_offset, last1);
- }
- else {
- assert(strpos + start_shift <= check_at);
- last = HOP4c(check_at, other->min_offset - start_shift,
- strbeg, strend);
- }
-
- s = HOP3c(rx_origin, other->min_offset, strend);
- if (s < other_last) /* These positions already checked */
- s = other_last;
-
- must = utf8_target ? other->utf8_substr : other->substr;
- assert(SvPOK(must));
- s = fbm_instr(
- (unsigned char*)s,
- (unsigned char*)last + SvCUR(must) - (SvTAIL(must)!=0),
- must,
- multiline ? FBMrf_MULTILINE : 0
- );
- DEBUG_EXECUTE_r({
- RE_PV_QUOTED_DECL(quoted, utf8_target, PERL_DEBUG_PAD_ZERO(0),
- SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
- PerlIO_printf(Perl_debug_log, " %s %s substr %s%s",
- s ? "Found" : "Contradicts",
- other_ix ? "floating" : "anchored",
- quoted, RE_SV_TAIL(must));
- });
-
-
- if (!s) {
- /* last1 is latest possible substr location. If we didn't
- * find it before there, we never will */
- if (last >= last1) {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- ", giving up...\n"));
- goto fail_finish;
- }
-
- /* try to find the check substr again at a later
- * position. Maybe next time we'll find the "other" substr
- * in range too */
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- ", trying %s at offset %ld...\n",
- (other_ix ? "floating" : "anchored"),
- (long)(HOP3c(check_at, 1, strend) - strpos)));
-
- other_last = HOP3c(last, 1, strend) /* highest failure */;
- rx_origin =
- other_ix /* i.e. if other-is-float */
- ? HOP3c(rx_origin, 1, strend)
- : HOP4c(last, 1 - other->min_offset, strbeg, strend);
- goto restart;
- }
- else {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n",
- (long)(s - strpos)));
-
- if (other_ix) { /* if (other-is-float) */
- /* other_last is set to s, not s+1, since its possible for
- * a floating substr to fail first time, then succeed
- * second time at the same floating position; e.g.:
- * "-AB--AABZ" =~ /\wAB\d*Z/
- * The first time round, anchored and float match at
- * "-(AB)--AAB(Z)" then fail on the initial \w character
- * class. Second time round, they match at "-AB--A(AB)(Z)".
- */
- other_last = s;
- }
- else {
- rx_origin = HOP3c(s, -other->min_offset, strbeg);
- other_last = HOP3c(s, 1, strend);
- }
- }
- }
- else {
- DEBUG_OPTIMISE_MORE_r(
- PerlIO_printf(Perl_debug_log,
- " Check-only match: offset min:%"IVdf" max:%"IVdf
- " check_at:%"IVdf" rx_origin:%"IVdf" rx_origin-check_at:%"IVdf
- " strend-strpos:%"IVdf"\n",
- (IV)prog->check_offset_min,
- (IV)prog->check_offset_max,
- (IV)(check_at-strpos),
- (IV)(rx_origin-strpos),
- (IV)(rx_origin-check_at),
- (IV)(strend-strpos)
- )
- );
- }
-
- postprocess_substr_matches:
-
- /* handle the extra constraint of /^.../m if present */
-
- if (ml_anch && rx_origin != strbeg && rx_origin[-1] != '\n') {
- char *s;
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " looking for /^/m anchor"));
-
- /* we have failed the constraint of a \n before rx_origin.
- * Find the next \n, if any, even if it's beyond the current
- * anchored and/or floating substrings. Whether we should be
- * scanning ahead for the next \n or the next substr is debatable.
- * On the one hand you'd expect rare substrings to appear less
- * often than \n's. On the other hand, searching for \n means
- * we're effectively flipping been check_substr and "\n" on each
- * iteration as the current "rarest" string candidate, which
- * means for example that we'll quickly reject the whole string if
- * hasn't got a \n, rather than trying every substr position
- * first
- */
-
- s = HOP3c(strend, - prog->minlen, strpos);
- if (s <= rx_origin ||
- ! ( rx_origin = (char *)memchr(rx_origin, '\n', s - rx_origin)))
- {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " Did not find /%s^%s/m...\n",
- PL_colors[0], PL_colors[1]));
- goto fail_finish;
- }
-
- /* earliest possible origin is 1 char after the \n.
- * (since *rx_origin == '\n', it's safe to ++ here rather than
- * HOP(rx_origin, 1)) */
- rx_origin++;
-
- if (prog->substrs->check_ix == 0 /* check is anchored */
- || rx_origin >= HOP3c(check_at, - prog->check_offset_min, strpos))
- {
- /* Position contradicts check-string; either because
- * check was anchored (and thus has no wiggle room),
- * or check was float and rx_origin is above the float range */
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " Found /%s^%s/m, restarting lookup for check-string at offset %ld...\n",
- PL_colors[0], PL_colors[1], (long)(rx_origin - strpos)));
- goto restart;
- }
-
- /* if we get here, the check substr must have been float,
- * is in range, and we may or may not have had an anchored
- * "other" substr which still contradicts */
- assert(prog->substrs->check_ix); /* check is float */
-
- if (utf8_target ? prog->anchored_utf8 : prog->anchored_substr) {
- /* whoops, the anchored "other" substr exists, so we still
- * contradict. On the other hand, the float "check" substr
- * didn't contradict, so just retry the anchored "other"
- * substr */
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " Found /%s^%s/m at offset %ld, rescanning for anchored from offset %ld...\n",
- PL_colors[0], PL_colors[1],
- (long)(rx_origin - strpos),
- (long)(rx_origin - strpos + prog->anchored_offset)));
- goto do_other_substr;
- }
-
- /* success: we don't contradict the found floating substring
- * (and there's no anchored substr). */
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " Found /%s^%s/m at offset %ld...\n",
- PL_colors[0], PL_colors[1], (long)(rx_origin - strpos)));
- }
- else {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " (multiline anchor test skipped)\n"));
- }
-
- success_at_start:
-
-
- /* if we have a starting character class, then test that extra constraint.
- * (trie stclasses are too expensive to use here, we are better off to
- * leave it to regmatch itself) */
-
- if (progi->regstclass && PL_regkind[OP(progi->regstclass)]!=TRIE) {
- const U8* const str = (U8*)STRING(progi->regstclass);
-
- /* XXX this value could be pre-computed */
- const int cl_l = (PL_regkind[OP(progi->regstclass)] == EXACT
- ? (reginfo->is_utf8_pat
- ? utf8_distance(str + STR_LEN(progi->regstclass), str)
- : STR_LEN(progi->regstclass))
- : 1);
- char * endpos;
- char *s;
- /* latest pos that a matching float substr constrains rx start to */
- char *rx_max_float = NULL;
-
- /* if the current rx_origin is anchored, either by satisfying an
- * anchored substring constraint, or a /^.../m constraint, then we
- * can reject the current origin if the start class isn't found
- * at the current position. If we have a float-only match, then
- * rx_origin is constrained to a range; so look for the start class
- * in that range. if neither, then look for the start class in the
- * whole rest of the string */
-
- /* XXX DAPM it's not clear what the minlen test is for, and why
- * it's not used in the floating case. Nothing in the test suite
- * causes minlen == 0 here. See <20140313134639.GS12844@iabyn.com>.
- * Here are some old comments, which may or may not be correct:
- *
- * minlen == 0 is possible if regstclass is \b or \B,
- * and the fixed substr is ''$.
- * Since minlen is already taken into account, rx_origin+1 is
- * before strend; accidentally, minlen >= 1 guaranties no false
- * positives at rx_origin + 1 even for \b or \B. But (minlen? 1 :
- * 0) below assumes that regstclass does not come from lookahead...
- * If regstclass takes bytelength more than 1: If charlength==1, OK.
- * This leaves EXACTF-ish only, which are dealt with in
- * find_byclass().
- */
-
- if (prog->anchored_substr || prog->anchored_utf8 || ml_anch)
- endpos= HOP3c(rx_origin, (prog->minlen ? cl_l : 0), strend);
- else if (prog->float_substr || prog->float_utf8) {
- rx_max_float = HOP3c(check_at, -start_shift, strbeg);
- endpos= HOP3c(rx_max_float, cl_l, strend);
- }
- else
- endpos= strend;
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " looking for class: start_shift: %"IVdf" check_at: %"IVdf
- " rx_origin: %"IVdf" endpos: %"IVdf"\n",
- (IV)start_shift, (IV)(check_at - strbeg),
- (IV)(rx_origin - strbeg), (IV)(endpos - strbeg)));
-
- s = find_byclass(prog, progi->regstclass, rx_origin, endpos,
- reginfo);
- if (!s) {
- if (endpos == strend) {
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- " Could not match STCLASS...\n") );
- goto fail;
- }
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- " This position contradicts STCLASS...\n") );
- if ((prog->intflags & PREGf_ANCH) && !ml_anch
- && !(prog->intflags & PREGf_IMPLICIT))
- goto fail;
-
- /* Contradict one of substrings */
- if (prog->anchored_substr || prog->anchored_utf8) {
- if (prog->substrs->check_ix == 1) { /* check is float */
- /* Have both, check_string is floating */
- assert(rx_origin + start_shift <= check_at);
- if (rx_origin + start_shift != check_at) {
- /* not at latest position float substr could match:
- * Recheck anchored substring, but not floating.
- * The condition above is in bytes rather than
- * chars for efficiency. It's conservative, in
- * that it errs on the side of doing 'goto
- * do_other_substr', where a more accurate
- * char-based calculation will be done */
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- " Looking for anchored substr starting at offset %ld...\n",
- (long)(other_last - strpos)) );
- goto do_other_substr;
- }
- }
- }
- else {
- /* float-only */
-
- if (ml_anch) {
- /* In the presence of ml_anch, we might be able to
- * find another \n without breaking the current float
- * constraint. */
-
- /* strictly speaking this should be HOP3c(..., 1, ...),
- * but since we goto a block of code that's going to
- * search for the next \n if any, its safe here */
- rx_origin++;
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- " Looking for /%s^%s/m starting at offset %ld...\n",
- PL_colors[0], PL_colors[1],
- (long)(rx_origin - strpos)) );
- goto postprocess_substr_matches;
- }
-
- /* strictly speaking this can never be true; but might
- * be if we ever allow intuit without substrings */
- if (!(utf8_target ? prog->float_utf8 : prog->float_substr))
- goto fail;
-
- rx_origin = rx_max_float;
- }
-
- /* at this point, any matching substrings have been
- * contradicted. Start again... */
-
- rx_origin = HOP3c(rx_origin, 1, strend);
-
- /* uses bytes rather than char calculations for efficiency.
- * It's conservative: it errs on the side of doing 'goto restart',
- * where there is code that does a proper char-based test */
- if (rx_origin + start_shift + end_shift > strend) {
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- " Could not match STCLASS...\n") );
- goto fail;
- }
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- " Looking for %s substr starting at offset %ld...\n",
- (prog->substrs->check_ix ? "floating" : "anchored"),
- (long)(rx_origin + start_shift - strpos)) );
- goto restart;
- }
-
- /* Success !!! */
-
- if (rx_origin != s) {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " By STCLASS: moving %ld --> %ld\n",
- (long)(rx_origin - strpos), (long)(s - strpos))
- );
- }
- else {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- " Does not contradict STCLASS...\n");
- );
- }
- }
-
- /* Decide whether using the substrings helped */
-
- if (rx_origin != strpos) {
- /* Fixed substring is found far enough so that the match
- cannot start at strpos. */
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " try at offset...\n"));
- ++BmUSEFUL(utf8_target ? prog->check_utf8 : prog->check_substr); /* hooray/5 */
- }
- else {
- /* The found rx_origin position does not prohibit matching at
- * strpos, so calling intuit didn't gain us anything. Decrement
- * the BmUSEFUL() count on the check substring, and if we reach
- * zero, free it. */
- if (!(prog->intflags & PREGf_NAUGHTY)
- && (utf8_target ? (
- prog->check_utf8 /* Could be deleted already */
- && --BmUSEFUL(prog->check_utf8) < 0
- && (prog->check_utf8 == prog->float_utf8)
- ) : (
- prog->check_substr /* Could be deleted already */
- && --BmUSEFUL(prog->check_substr) < 0
- && (prog->check_substr == prog->float_substr)
- )))
- {
- /* If flags & SOMETHING - do not do it many times on the same match */
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, " ... Disabling check substring...\n"));
- /* XXX Does the destruction order has to change with utf8_target? */
- SvREFCNT_dec(utf8_target ? prog->check_utf8 : prog->check_substr);
- SvREFCNT_dec(utf8_target ? prog->check_substr : prog->check_utf8);
- prog->check_substr = prog->check_utf8 = NULL; /* disable */
- prog->float_substr = prog->float_utf8 = NULL; /* clear */
- check = NULL; /* abort */
- /* XXXX This is a remnant of the old implementation. It
- looks wasteful, since now INTUIT can use many
- other heuristics. */
- prog->extflags &= ~RXf_USE_INTUIT;
- }
- }
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "Intuit: %sSuccessfully guessed:%s match at offset %ld\n",
- PL_colors[4], PL_colors[5], (long)(rx_origin - strpos)) );
-
- return rx_origin;
-
- fail_finish: /* Substring not found */
- if (prog->check_substr || prog->check_utf8) /* could be removed already */
- BmUSEFUL(utf8_target ? prog->check_utf8 : prog->check_substr) += 5; /* hooray */
- fail:
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch rejected by optimizer%s\n",
- PL_colors[4], PL_colors[5]));
- return NULL;
-}
-
-
-#define DECL_TRIE_TYPE(scan) \
- const enum { trie_plain, trie_utf8, trie_utf8_fold, trie_latin_utf8_fold, \
- trie_utf8_exactfa_fold, trie_latin_utf8_exactfa_fold } \
- trie_type = ((scan->flags == EXACT) \
- ? (utf8_target ? trie_utf8 : trie_plain) \
- : (scan->flags == EXACTFA) \
- ? (utf8_target ? trie_utf8_exactfa_fold : trie_latin_utf8_exactfa_fold) \
- : (utf8_target ? trie_utf8_fold : trie_latin_utf8_fold))
-
-#define REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc, uscan, len, uvc, charid, foldlen, foldbuf, uniflags) \
-STMT_START { \
- STRLEN skiplen; \
- U8 flags = FOLD_FLAGS_FULL; \
- switch (trie_type) { \
- case trie_utf8_exactfa_fold: \
- flags |= FOLD_FLAGS_NOMIX_ASCII; \
- /* FALLTHROUGH */ \
- case trie_utf8_fold: \
- if ( foldlen>0 ) { \
- uvc = utf8n_to_uvchr( (const U8*) uscan, UTF8_MAXLEN, &len, uniflags ); \
- foldlen -= len; \
- uscan += len; \
- len=0; \
- } else { \
- uvc = _to_utf8_fold_flags( (const U8*) uc, foldbuf, &foldlen, flags); \
- len = UTF8SKIP(uc); \
- skiplen = UNISKIP( uvc ); \
- foldlen -= skiplen; \
- uscan = foldbuf + skiplen; \
- } \
- break; \
- case trie_latin_utf8_exactfa_fold: \
- flags |= FOLD_FLAGS_NOMIX_ASCII; \
- /* FALLTHROUGH */ \
- case trie_latin_utf8_fold: \
- if ( foldlen>0 ) { \
- uvc = utf8n_to_uvchr( (const U8*) uscan, UTF8_MAXLEN, &len, uniflags ); \
- foldlen -= len; \
- uscan += len; \
- len=0; \
- } else { \
- len = 1; \
- uvc = _to_fold_latin1( (U8) *uc, foldbuf, &foldlen, flags); \
- skiplen = UNISKIP( uvc ); \
- foldlen -= skiplen; \
- uscan = foldbuf + skiplen; \
- } \
- break; \
- case trie_utf8: \
- uvc = utf8n_to_uvchr( (const U8*) uc, UTF8_MAXLEN, &len, uniflags ); \
- break; \
- case trie_plain: \
- uvc = (UV)*uc; \
- len = 1; \
- } \
- if (uvc < 256) { \
- charid = trie->charmap[ uvc ]; \
- } \
- else { \
- charid = 0; \
- if (widecharmap) { \
- SV** const svpp = hv_fetch(widecharmap, \
- (char*)&uvc, sizeof(UV), 0); \
- if (svpp) \
- charid = (U16)SvIV(*svpp); \
- } \
- } \
-} STMT_END
-
-#define REXEC_FBC_EXACTISH_SCAN(CoNd) \
-STMT_START { \
- while (s <= e) { \
- if ( (CoNd) \
- && (ln == 1 || folder(s, pat_string, ln)) \
- && (reginfo->intuit || regtry(reginfo, &s)) )\
- goto got_it; \
- s++; \
- } \
-} STMT_END
-
-#define REXEC_FBC_UTF8_SCAN(CoDe) \
-STMT_START { \
- while (s < strend) { \
- CoDe \
- s += UTF8SKIP(s); \
- } \
-} STMT_END
-
-#define REXEC_FBC_SCAN(CoDe) \
-STMT_START { \
- while (s < strend) { \
- CoDe \
- s++; \
- } \
-} STMT_END
-
-#define REXEC_FBC_UTF8_CLASS_SCAN(CoNd) \
-REXEC_FBC_UTF8_SCAN( \
- if (CoNd) { \
- if (tmp && (reginfo->intuit || regtry(reginfo, &s))) \
- goto got_it; \
- else \
- tmp = doevery; \
- } \
- else \
- tmp = 1; \
-)
-
-#define REXEC_FBC_CLASS_SCAN(CoNd) \
-REXEC_FBC_SCAN( \
- if (CoNd) { \
- if (tmp && (reginfo->intuit || regtry(reginfo, &s))) \
- goto got_it; \
- else \
- tmp = doevery; \
- } \
- else \
- tmp = 1; \
-)
-
-#define REXEC_FBC_TRYIT \
-if ((reginfo->intuit || regtry(reginfo, &s))) \
- goto got_it
-
-#define REXEC_FBC_CSCAN(CoNdUtF8,CoNd) \
- if (utf8_target) { \
- REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8); \
- } \
- else { \
- REXEC_FBC_CLASS_SCAN(CoNd); \
- }
-
-#define DUMP_EXEC_POS(li,s,doutf8) \
- dump_exec_pos(li,s,(reginfo->strend),(reginfo->strbeg), \
- startpos, doutf8)
-
-
-#define UTF8_NOLOAD(TEST_NON_UTF8, IF_SUCCESS, IF_FAIL) \
- tmp = (s != reginfo->strbeg) ? UCHARAT(s - 1) : '\n'; \
- tmp = TEST_NON_UTF8(tmp); \
- REXEC_FBC_UTF8_SCAN( \
- if (tmp == ! TEST_NON_UTF8((U8) *s)) { \
- tmp = !tmp; \
- IF_SUCCESS; \
- } \
- else { \
- IF_FAIL; \
- } \
- ); \
-
-#define UTF8_LOAD(TeSt1_UtF8, TeSt2_UtF8, IF_SUCCESS, IF_FAIL) \
- if (s == reginfo->strbeg) { \
- tmp = '\n'; \
- } \
- else { \
- U8 * const r = reghop3((U8*)s, -1, (U8*)reginfo->strbeg); \
- tmp = utf8n_to_uvchr(r, (U8*) reginfo->strend - r, \
- 0, UTF8_ALLOW_DEFAULT); \
- } \
- tmp = TeSt1_UtF8; \
- LOAD_UTF8_CHARCLASS_ALNUM(); \
- REXEC_FBC_UTF8_SCAN( \
- if (tmp == ! (TeSt2_UtF8)) { \
- tmp = !tmp; \
- IF_SUCCESS; \
- } \
- else { \
- IF_FAIL; \
- } \
- ); \
-
-/* The only difference between the BOUND and NBOUND cases is that
- * REXEC_FBC_TRYIT is called when matched in BOUND, and when non-matched in
- * NBOUND. This is accomplished by passing it in either the if or else clause,
- * with the other one being empty */
-#define FBC_BOUND(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
- FBC_BOUND_COMMON(UTF8_LOAD(TEST1_UTF8, TEST2_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER), TEST_NON_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER)
-
-#define FBC_BOUND_NOLOAD(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
- FBC_BOUND_COMMON(UTF8_NOLOAD(TEST_NON_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER), TEST_NON_UTF8, REXEC_FBC_TRYIT, PLACEHOLDER)
-
-#define FBC_NBOUND(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
- FBC_BOUND_COMMON(UTF8_LOAD(TEST1_UTF8, TEST2_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT), TEST_NON_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT)
-
-#define FBC_NBOUND_NOLOAD(TEST_NON_UTF8, TEST1_UTF8, TEST2_UTF8) \
- FBC_BOUND_COMMON(UTF8_NOLOAD(TEST_NON_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT), TEST_NON_UTF8, PLACEHOLDER, REXEC_FBC_TRYIT)
-
-
-/* Common to the BOUND and NBOUND cases. Unfortunately the UTF8 tests need to
- * be passed in completely with the variable name being tested, which isn't
- * such a clean interface, but this is easier to read than it was before. We
- * are looking for the boundary (or non-boundary between a word and non-word
- * character. The utf8 and non-utf8 cases have the same logic, but the details
- * must be different. Find the "wordness" of the character just prior to this
- * one, and compare it with the wordness of this one. If they differ, we have
- * a boundary. At the beginning of the string, pretend that the previous
- * character was a new-line */
-#define FBC_BOUND_COMMON(UTF8_CODE, TEST_NON_UTF8, IF_SUCCESS, IF_FAIL) \
- if (utf8_target) { \
- UTF8_CODE \
- } \
- else { /* Not utf8 */ \
- tmp = (s != reginfo->strbeg) ? UCHARAT(s - 1) : '\n'; \
- tmp = TEST_NON_UTF8(tmp); \
- REXEC_FBC_SCAN( \
- if (tmp == ! TEST_NON_UTF8((U8) *s)) { \
- tmp = !tmp; \
- IF_SUCCESS; \
- } \
- else { \
- IF_FAIL; \
- } \
- ); \
- } \
- if ((!prog->minlen && tmp) && (reginfo->intuit || regtry(reginfo, &s))) \
- goto got_it;
-
-/* We know what class REx starts with. Try to find this position... */
-/* if reginfo->intuit, its a dryrun */
-/* annoyingly all the vars in this routine have different names from their counterparts
- in regmatch. /grrr */
-
-STATIC char *
-S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
- const char *strend, regmatch_info *reginfo)
-{
- dVAR;
- const I32 doevery = (prog->intflags & PREGf_SKIP) == 0;
- char *pat_string; /* The pattern's exactish string */
- char *pat_end; /* ptr to end char of pat_string */
- re_fold_t folder; /* Function for computing non-utf8 folds */
- const U8 *fold_array; /* array for folding ords < 256 */
- STRLEN ln;
- STRLEN lnc;
- U8 c1;
- U8 c2;
- char *e;
- I32 tmp = 1; /* Scratch variable? */
- const bool utf8_target = reginfo->is_utf8_target;
- UV utf8_fold_flags = 0;
- const bool is_utf8_pat = reginfo->is_utf8_pat;
- bool to_complement = FALSE; /* Invert the result? Taking the xor of this
- with a result inverts that result, as 0^1 =
- 1 and 1^1 = 0 */
- _char_class_number classnum;
-
- RXi_GET_DECL(prog,progi);
-
- PERL_ARGS_ASSERT_FIND_BYCLASS;
-
- /* We know what class it must start with. */
- switch (OP(c)) {
- case ANYOF:
- if (utf8_target) {
- REXEC_FBC_UTF8_CLASS_SCAN(
- reginclass(prog, c, (U8*)s, (U8*) strend, utf8_target));
- }
- else {
- REXEC_FBC_CLASS_SCAN(REGINCLASS(prog, c, (U8*)s));
- }
- break;
- case CANY:
- REXEC_FBC_SCAN(
- if (tmp && (reginfo->intuit || regtry(reginfo, &s)))
- goto got_it;
- else
- tmp = doevery;
- );
- break;
-
- case EXACTFA_NO_TRIE: /* This node only generated for non-utf8 patterns */
- assert(! is_utf8_pat);
- /* FALLTHROUGH */
- case EXACTFA:
- if (is_utf8_pat || utf8_target) {
- utf8_fold_flags = FOLDEQ_UTF8_NOMIX_ASCII;
- goto do_exactf_utf8;
- }
- fold_array = PL_fold_latin1; /* Latin1 folds are not affected by */
- folder = foldEQ_latin1; /* /a, except the sharp s one which */
- goto do_exactf_non_utf8; /* isn't dealt with by these */
-
- case EXACTF: /* This node only generated for non-utf8 patterns */
- assert(! is_utf8_pat);
- if (utf8_target) {
- utf8_fold_flags = 0;
- goto do_exactf_utf8;
- }
- fold_array = PL_fold;
- folder = foldEQ;
- goto do_exactf_non_utf8;
-
- case EXACTFL:
- if (is_utf8_pat || utf8_target || IN_UTF8_CTYPE_LOCALE) {
- utf8_fold_flags = FOLDEQ_LOCALE;
- goto do_exactf_utf8;
- }
- fold_array = PL_fold_locale;
- folder = foldEQ_locale;
- goto do_exactf_non_utf8;
-
- case EXACTFU_SS:
- if (is_utf8_pat) {
- utf8_fold_flags = FOLDEQ_S2_ALREADY_FOLDED;
- }
- goto do_exactf_utf8;
-
- case EXACTFU:
- if (is_utf8_pat || utf8_target) {
- utf8_fold_flags = is_utf8_pat ? FOLDEQ_S2_ALREADY_FOLDED : 0;
- goto do_exactf_utf8;
- }
-
- /* Any 'ss' in the pattern should have been replaced by regcomp,
- * so we don't have to worry here about this single special case
- * in the Latin1 range */
- fold_array = PL_fold_latin1;
- folder = foldEQ_latin1;
-
- /* FALLTHROUGH */
-
- do_exactf_non_utf8: /* Neither pattern nor string are UTF8, and there
- are no glitches with fold-length differences
- between the target string and pattern */
-
- /* The idea in the non-utf8 EXACTF* cases is to first find the
- * first character of the EXACTF* node and then, if necessary,
- * case-insensitively compare the full text of the node. c1 is the
- * first character. c2 is its fold. This logic will not work for
- * Unicode semantics and the german sharp ss, which hence should
- * not be compiled into a node that gets here. */
- pat_string = STRING(c);
- ln = STR_LEN(c); /* length to match in octets/bytes */
-
- /* We know that we have to match at least 'ln' bytes (which is the
- * same as characters, since not utf8). If we have to match 3
- * characters, and there are only 2 availabe, we know without
- * trying that it will fail; so don't start a match past the
- * required minimum number from the far end */
- e = HOP3c(strend, -((SSize_t)ln), s);
-
- if (reginfo->intuit && e < s) {
- e = s; /* Due to minlen logic of intuit() */
- }
-
- c1 = *pat_string;
- c2 = fold_array[c1];
- if (c1 == c2) { /* If char and fold are the same */
- REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1);
- }
- else {
- REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1 || *(U8*)s == c2);
- }
- break;
-
- do_exactf_utf8:
- {
- unsigned expansion;
-
- /* If one of the operands is in utf8, we can't use the simpler folding
- * above, due to the fact that many different characters can have the
- * same fold, or portion of a fold, or different- length fold */
- pat_string = STRING(c);
- ln = STR_LEN(c); /* length to match in octets/bytes */
- pat_end = pat_string + ln;
- lnc = is_utf8_pat /* length to match in characters */
- ? utf8_length((U8 *) pat_string, (U8 *) pat_end)
- : ln;
-
- /* We have 'lnc' characters to match in the pattern, but because of
- * multi-character folding, each character in the target can match
- * up to 3 characters (Unicode guarantees it will never exceed
- * this) if it is utf8-encoded; and up to 2 if not (based on the
- * fact that the Latin 1 folds are already determined, and the
- * only multi-char fold in that range is the sharp-s folding to
- * 'ss'. Thus, a pattern character can match as little as 1/3 of a
- * string character. Adjust lnc accordingly, rounding up, so that
- * if we need to match at least 4+1/3 chars, that really is 5. */
- expansion = (utf8_target) ? UTF8_MAX_FOLD_CHAR_EXPAND : 2;
- lnc = (lnc + expansion - 1) / expansion;
-
- /* As in the non-UTF8 case, if we have to match 3 characters, and
- * only 2 are left, it's guaranteed to fail, so don't start a
- * match that would require us to go beyond the end of the string
- */
- e = HOP3c(strend, -((SSize_t)lnc), s);
-
- if (reginfo->intuit && e < s) {
- e = s; /* Due to minlen logic of intuit() */
- }
-
- /* XXX Note that we could recalculate e to stop the loop earlier,
- * as the worst case expansion above will rarely be met, and as we
- * go along we would usually find that e moves further to the left.
- * This would happen only after we reached the point in the loop
- * where if there were no expansion we should fail. Unclear if
- * worth the expense */
-
- while (s <= e) {
- char *my_strend= (char *)strend;
- if (foldEQ_utf8_flags(s, &my_strend, 0, utf8_target,
- pat_string, NULL, ln, is_utf8_pat, utf8_fold_flags)
- && (reginfo->intuit || regtry(reginfo, &s)) )
- {
- goto got_it;
- }
- s += (utf8_target) ? UTF8SKIP(s) : 1;
- }
- break;
- }
- case BOUNDL:
- FBC_BOUND(isWORDCHAR_LC,
- isWORDCHAR_LC_uvchr(tmp),
- isWORDCHAR_LC_utf8((U8*)s));
- break;
- case NBOUNDL:
- FBC_NBOUND(isWORDCHAR_LC,
- isWORDCHAR_LC_uvchr(tmp),
- isWORDCHAR_LC_utf8((U8*)s));
- break;
- case BOUND:
- FBC_BOUND(isWORDCHAR,
- isWORDCHAR_uni(tmp),
- cBOOL(swash_fetch(PL_utf8_swash_ptrs[_CC_WORDCHAR], (U8*)s, utf8_target)));
- break;
- case BOUNDA:
- FBC_BOUND_NOLOAD(isWORDCHAR_A,
- isWORDCHAR_A(tmp),
- isWORDCHAR_A((U8*)s));
- break;
- case NBOUND:
- FBC_NBOUND(isWORDCHAR,
- isWORDCHAR_uni(tmp),
- cBOOL(swash_fetch(PL_utf8_swash_ptrs[_CC_WORDCHAR], (U8*)s, utf8_target)));
- break;
- case NBOUNDA:
- FBC_NBOUND_NOLOAD(isWORDCHAR_A,
- isWORDCHAR_A(tmp),
- isWORDCHAR_A((U8*)s));
- break;
- case BOUNDU:
- FBC_BOUND(isWORDCHAR_L1,
- isWORDCHAR_uni(tmp),
- cBOOL(swash_fetch(PL_utf8_swash_ptrs[_CC_WORDCHAR], (U8*)s, utf8_target)));
- break;
- case NBOUNDU:
- FBC_NBOUND(isWORDCHAR_L1,
- isWORDCHAR_uni(tmp),
- cBOOL(swash_fetch(PL_utf8_swash_ptrs[_CC_WORDCHAR], (U8*)s, utf8_target)));
- break;
- case LNBREAK:
- REXEC_FBC_CSCAN(is_LNBREAK_utf8_safe(s, strend),
- is_LNBREAK_latin1_safe(s, strend)
- );
- break;
-
- /* The argument to all the POSIX node types is the class number to pass to
- * _generic_isCC() to build a mask for searching in PL_charclass[] */
-
- case NPOSIXL:
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXL:
- REXEC_FBC_CSCAN(to_complement ^ cBOOL(isFOO_utf8_lc(FLAGS(c), (U8 *) s)),
- to_complement ^ cBOOL(isFOO_lc(FLAGS(c), *s)));
- break;
-
- case NPOSIXD:
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXD:
- if (utf8_target) {
- goto posix_utf8;
- }
- goto posixa;
-
- case NPOSIXA:
- if (utf8_target) {
- /* The complement of something that matches only ASCII matches all
- * non-ASCII, plus everything in ASCII that isn't in the class. */
- REXEC_FBC_UTF8_CLASS_SCAN(! isASCII_utf8(s)
- || ! _generic_isCC_A(*s, FLAGS(c)));
- break;
- }
-
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXA:
- posixa:
- /* Don't need to worry about utf8, as it can match only a single
- * byte invariant character. */
- REXEC_FBC_CLASS_SCAN(
- to_complement ^ cBOOL(_generic_isCC_A(*s, FLAGS(c))));
- break;
-
- case NPOSIXU:
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXU:
- if (! utf8_target) {
- REXEC_FBC_CLASS_SCAN(to_complement ^ cBOOL(_generic_isCC(*s,
- FLAGS(c))));
- }
- else {
-
- posix_utf8:
- classnum = (_char_class_number) FLAGS(c);
- if (classnum < _FIRST_NON_SWASH_CC) {
- while (s < strend) {
-
- /* We avoid loading in the swash as long as possible, but
- * should we have to, we jump to a separate loop. This
- * extra 'if' statement is what keeps this code from being
- * just a call to REXEC_FBC_UTF8_CLASS_SCAN() */
- if (UTF8_IS_ABOVE_LATIN1(*s)) {
- goto found_above_latin1;
- }
- if ((UTF8_IS_INVARIANT(*s)
- && to_complement ^ cBOOL(_generic_isCC((U8) *s,
- classnum)))
- || (UTF8_IS_DOWNGRADEABLE_START(*s)
- && to_complement ^ cBOOL(
- _generic_isCC(TWO_BYTE_UTF8_TO_NATIVE(*s,
- *(s + 1)),
- classnum))))
- {
- if (tmp && (reginfo->intuit || regtry(reginfo, &s)))
- goto got_it;
- else {
- tmp = doevery;
- }
- }
- else {
- tmp = 1;
- }
- s += UTF8SKIP(s);
- }
- }
- else switch (classnum) { /* These classes are implemented as
- macros */
- case _CC_ENUM_SPACE: /* XXX would require separate code if we
- revert the change of \v matching this */
- /* FALLTHROUGH */
-
- case _CC_ENUM_PSXSPC:
- REXEC_FBC_UTF8_CLASS_SCAN(
- to_complement ^ cBOOL(isSPACE_utf8(s)));
- break;
-
- case _CC_ENUM_BLANK:
- REXEC_FBC_UTF8_CLASS_SCAN(
- to_complement ^ cBOOL(isBLANK_utf8(s)));
- break;
-
- case _CC_ENUM_XDIGIT:
- REXEC_FBC_UTF8_CLASS_SCAN(
- to_complement ^ cBOOL(isXDIGIT_utf8(s)));
- break;
-
- case _CC_ENUM_VERTSPACE:
- REXEC_FBC_UTF8_CLASS_SCAN(
- to_complement ^ cBOOL(isVERTWS_utf8(s)));
- break;
-
- case _CC_ENUM_CNTRL:
- REXEC_FBC_UTF8_CLASS_SCAN(
- to_complement ^ cBOOL(isCNTRL_utf8(s)));
- break;
-
- default:
- Perl_croak(aTHX_ "panic: find_byclass() node %d='%s' has an unexpected character class '%d'", OP(c), PL_reg_name[OP(c)], classnum);
- assert(0); /* NOTREACHED */
- }
- }
- break;
-
- found_above_latin1: /* Here we have to load a swash to get the result
- for the current code point */
- if (! PL_utf8_swash_ptrs[classnum]) {
- U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
- PL_utf8_swash_ptrs[classnum] =
- _core_swash_init("utf8",
- "",
- &PL_sv_undef, 1, 0,
- PL_XPosix_ptrs[classnum], &flags);
- }
-
- /* This is a copy of the loop above for swash classes, though using the
- * FBC macro instead of being expanded out. Since we've loaded the
- * swash, we don't have to check for that each time through the loop */
- REXEC_FBC_UTF8_CLASS_SCAN(
- to_complement ^ cBOOL(_generic_utf8(
- classnum,
- s,
- swash_fetch(PL_utf8_swash_ptrs[classnum],
- (U8 *) s, TRUE))));
- break;
-
- case AHOCORASICKC:
- case AHOCORASICK:
- {
- DECL_TRIE_TYPE(c);
- /* what trie are we using right now */
- reg_ac_data *aho = (reg_ac_data*)progi->data->data[ ARG( c ) ];
- reg_trie_data *trie = (reg_trie_data*)progi->data->data[ aho->trie ];
- HV *widecharmap = MUTABLE_HV(progi->data->data[ aho->trie + 1 ]);
-
- const char *last_start = strend - trie->minlen;
-#ifdef DEBUGGING
- const char *real_start = s;
-#endif
- STRLEN maxlen = trie->maxlen;
- SV *sv_points;
- U8 **points; /* map of where we were in the input string
- when reading a given char. For ASCII this
- is unnecessary overhead as the relationship
- is always 1:1, but for Unicode, especially
- case folded Unicode this is not true. */
- U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
- U8 *bitmap=NULL;
-
-
- GET_RE_DEBUG_FLAGS_DECL;
-
- /* We can't just allocate points here. We need to wrap it in
- * an SV so it gets freed properly if there is a croak while
- * running the match */
- ENTER;
- SAVETMPS;
- sv_points=newSV(maxlen * sizeof(U8 *));
- SvCUR_set(sv_points,
- maxlen * sizeof(U8 *));
- SvPOK_on(sv_points);
- sv_2mortal(sv_points);
- points=(U8**)SvPV_nolen(sv_points );
- if ( trie_type != trie_utf8_fold
- && (trie->bitmap || OP(c)==AHOCORASICKC) )
- {
- if (trie->bitmap)
- bitmap=(U8*)trie->bitmap;
- else
- bitmap=(U8*)ANYOF_BITMAP(c);
- }
- /* this is the Aho-Corasick algorithm modified a touch
- to include special handling for long "unknown char" sequences.
- The basic idea being that we use AC as long as we are dealing
- with a possible matching char, when we encounter an unknown char
- (and we have not encountered an accepting state) we scan forward
- until we find a legal starting char.
- AC matching is basically that of trie matching, except that when
- we encounter a failing transition, we fall back to the current
- states "fail state", and try the current char again, a process
- we repeat until we reach the root state, state 1, or a legal
- transition. If we fail on the root state then we can either
- terminate if we have reached an accepting state previously, or
- restart the entire process from the beginning if we have not.
-
- */
- while (s <= last_start) {
- const U32 uniflags = UTF8_ALLOW_DEFAULT;
- U8 *uc = (U8*)s;
- U16 charid = 0;
- U32 base = 1;
- U32 state = 1;
- UV uvc = 0;
- STRLEN len = 0;
- STRLEN foldlen = 0;
- U8 *uscan = (U8*)NULL;
- U8 *leftmost = NULL;
-#ifdef DEBUGGING
- U32 accepted_word= 0;
-#endif
- U32 pointpos = 0;
-
- while ( state && uc <= (U8*)strend ) {
- int failed=0;
- U32 word = aho->states[ state ].wordnum;
-
- if( state==1 ) {
- if ( bitmap ) {
- DEBUG_TRIE_EXECUTE_r(
- if ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
- dump_exec_pos( (char *)uc, c, strend, real_start,
- (char *)uc, utf8_target );
- PerlIO_printf( Perl_debug_log,
- " Scanning for legal start char...\n");
- }
- );
- if (utf8_target) {
- while ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
- uc += UTF8SKIP(uc);
- }
- } else {
- while ( uc <= (U8*)last_start && !BITMAP_TEST(bitmap,*uc) ) {
- uc++;
- }
- }
- s= (char *)uc;
- }
- if (uc >(U8*)last_start) break;
- }
-
- if ( word ) {
- U8 *lpos= points[ (pointpos - trie->wordinfo[word].len) % maxlen ];
- if (!leftmost || lpos < leftmost) {
- DEBUG_r(accepted_word=word);
- leftmost= lpos;
- }
- if (base==0) break;
-
- }
- points[pointpos++ % maxlen]= uc;
- if (foldlen || uc < (U8*)strend) {
- REXEC_TRIE_READ_CHAR(trie_type, trie,
- widecharmap, uc,
- uscan, len, uvc, charid, foldlen,
- foldbuf, uniflags);
- DEBUG_TRIE_EXECUTE_r({
- dump_exec_pos( (char *)uc, c, strend,
- real_start, s, utf8_target);
- PerlIO_printf(Perl_debug_log,
- " Charid:%3u CP:%4"UVxf" ",
- charid, uvc);
- });
- }
- else {
- len = 0;
- charid = 0;
- }
-
-
- do {
-#ifdef DEBUGGING
- word = aho->states[ state ].wordnum;
-#endif
- base = aho->states[ state ].trans.base;
-
- DEBUG_TRIE_EXECUTE_r({
- if (failed)
- dump_exec_pos( (char *)uc, c, strend, real_start,
- s, utf8_target );
- PerlIO_printf( Perl_debug_log,
- "%sState: %4"UVxf", word=%"UVxf,
- failed ? " Fail transition to " : "",
- (UV)state, (UV)word);
- });
- if ( base ) {
- U32 tmp;
- I32 offset;
- if (charid &&
- ( ((offset = base + charid
- - 1 - trie->uniquecharcount)) >= 0)
- && ((U32)offset < trie->lasttrans)
- && trie->trans[offset].check == state
- && (tmp=trie->trans[offset].next))
- {
- DEBUG_TRIE_EXECUTE_r(
- PerlIO_printf( Perl_debug_log," - legal\n"));
- state = tmp;
- break;
- }
- else {
- DEBUG_TRIE_EXECUTE_r(
- PerlIO_printf( Perl_debug_log," - fail\n"));
- failed = 1;
- state = aho->fail[state];
- }
- }
- else {
- /* we must be accepting here */
- DEBUG_TRIE_EXECUTE_r(
- PerlIO_printf( Perl_debug_log," - accepting\n"));
- failed = 1;
- break;
- }
- } while(state);
- uc += len;
- if (failed) {
- if (leftmost)
- break;
- if (!state) state = 1;
- }
- }
- if ( aho->states[ state ].wordnum ) {
- U8 *lpos = points[ (pointpos - trie->wordinfo[aho->states[ state ].wordnum].len) % maxlen ];
- if (!leftmost || lpos < leftmost) {
- DEBUG_r(accepted_word=aho->states[ state ].wordnum);
- leftmost = lpos;
- }
- }
- if (leftmost) {
- s = (char*)leftmost;
- DEBUG_TRIE_EXECUTE_r({
- PerlIO_printf(
- Perl_debug_log,"Matches word #%"UVxf" at position %"IVdf". Trying full pattern...\n",
- (UV)accepted_word, (IV)(s - real_start)
- );
- });
- if (reginfo->intuit || regtry(reginfo, &s)) {
- FREETMPS;
- LEAVE;
- goto got_it;
- }
- s = HOPc(s,1);
- DEBUG_TRIE_EXECUTE_r({
- PerlIO_printf( Perl_debug_log,"Pattern failed. Looking for new start point...\n");
- });
- } else {
- DEBUG_TRIE_EXECUTE_r(
- PerlIO_printf( Perl_debug_log,"No match.\n"));
- break;
- }
- }
- FREETMPS;
- LEAVE;
- }
- break;
- default:
- Perl_croak(aTHX_ "panic: unknown regstclass %d", (int)OP(c));
- }
- return 0;
- got_it:
- return s;
-}
-
-/* set RX_SAVED_COPY, RX_SUBBEG etc.
- * flags have same meanings as with regexec_flags() */
-
-static void
-S_reg_set_capture_string(pTHX_ REGEXP * const rx,
- char *strbeg,
- char *strend,
- SV *sv,
- U32 flags,
- bool utf8_target)
-{
- struct regexp *const prog = ReANY(rx);
-
- if (flags & REXEC_COPY_STR) {
-#ifdef PERL_ANY_COW
- if (SvCANCOW(sv)) {
- if (DEBUG_C_TEST) {
- PerlIO_printf(Perl_debug_log,
- "Copy on write: regexp capture, type %d\n",
- (int) SvTYPE(sv));
- }
- /* Create a new COW SV to share the match string and store
- * in saved_copy, unless the current COW SV in saved_copy
- * is valid and suitable for our purpose */
- if (( prog->saved_copy
- && SvIsCOW(prog->saved_copy)
- && SvPOKp(prog->saved_copy)
- && SvIsCOW(sv)
- && SvPOKp(sv)
- && SvPVX(sv) == SvPVX(prog->saved_copy)))
- {
- /* just reuse saved_copy SV */
- if (RXp_MATCH_COPIED(prog)) {
- Safefree(prog->subbeg);
- RXp_MATCH_COPIED_off(prog);
- }
- }
- else {
- /* create new COW SV to share string */
- RX_MATCH_COPY_FREE(rx);
- prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv);
- }
- prog->subbeg = (char *)SvPVX_const(prog->saved_copy);
- assert (SvPOKp(prog->saved_copy));
- prog->sublen = strend - strbeg;
- prog->suboffset = 0;
- prog->subcoffset = 0;
- } else
-#endif
- {
- SSize_t min = 0;
- SSize_t max = strend - strbeg;
- SSize_t sublen;
-
- if ( (flags & REXEC_COPY_SKIP_POST)
- && !(prog->extflags & RXf_PMf_KEEPCOPY) /* //p */
- && !(PL_sawampersand & SAWAMPERSAND_RIGHT)
- ) { /* don't copy $' part of string */
- U32 n = 0;
- max = -1;
- /* calculate the right-most part of the string covered
- * by a capture. Due to look-ahead, this may be to
- * the right of $&, so we have to scan all captures */
- while (n <= prog->lastparen) {
- if (prog->offs[n].end > max)
- max = prog->offs[n].end;
- n++;
- }
- if (max == -1)
- max = (PL_sawampersand & SAWAMPERSAND_LEFT)
- ? prog->offs[0].start
- : 0;
- assert(max >= 0 && max <= strend - strbeg);
- }
-
- if ( (flags & REXEC_COPY_SKIP_PRE)
- && !(prog->extflags & RXf_PMf_KEEPCOPY) /* //p */
- && !(PL_sawampersand & SAWAMPERSAND_LEFT)
- ) { /* don't copy $` part of string */
- U32 n = 0;
- min = max;
- /* calculate the left-most part of the string covered
- * by a capture. Due to look-behind, this may be to
- * the left of $&, so we have to scan all captures */
- while (min && n <= prog->lastparen) {
- if ( prog->offs[n].start != -1
- && prog->offs[n].start < min)
- {
- min = prog->offs[n].start;
- }
- n++;
- }
- if ((PL_sawampersand & SAWAMPERSAND_RIGHT)
- && min > prog->offs[0].end
- )
- min = prog->offs[0].end;
-
- }
-
- assert(min >= 0 && min <= max && min <= strend - strbeg);
- sublen = max - min;
-
- if (RX_MATCH_COPIED(rx)) {
- if (sublen > prog->sublen)
- prog->subbeg =
- (char*)saferealloc(prog->subbeg, sublen+1);
- }
- else
- prog->subbeg = (char*)safemalloc(sublen+1);
- Copy(strbeg + min, prog->subbeg, sublen, char);
- prog->subbeg[sublen] = '\0';
- prog->suboffset = min;
- prog->sublen = sublen;
- RX_MATCH_COPIED_on(rx);
- }
- prog->subcoffset = prog->suboffset;
- if (prog->suboffset && utf8_target) {
- /* Convert byte offset to chars.
- * XXX ideally should only compute this if @-/@+
- * has been seen, a la PL_sawampersand ??? */
-
- /* If there's a direct correspondence between the
- * string which we're matching and the original SV,
- * then we can use the utf8 len cache associated with
- * the SV. In particular, it means that under //g,
- * sv_pos_b2u() will use the previously cached
- * position to speed up working out the new length of
- * subcoffset, rather than counting from the start of
- * the string each time. This stops
- * $x = "\x{100}" x 1E6; 1 while $x =~ /(.)/g;
- * from going quadratic */
- if (SvPOKp(sv) && SvPVX(sv) == strbeg)
- prog->subcoffset = sv_pos_b2u_flags(sv, prog->subcoffset,
- SV_GMAGIC|SV_CONST_RETURN);
- else
- prog->subcoffset = utf8_length((U8*)strbeg,
- (U8*)(strbeg+prog->suboffset));
- }
- }
- else {
- RX_MATCH_COPY_FREE(rx);
- prog->subbeg = strbeg;
- prog->suboffset = 0;
- prog->subcoffset = 0;
- prog->sublen = strend - strbeg;
- }
-}
-
-
-
-
-/*
- - regexec_flags - match a regexp against a string
- */
-I32
-Perl_regexec_flags(pTHX_ REGEXP * const rx, char *stringarg, char *strend,
- char *strbeg, SSize_t minend, SV *sv, void *data, U32 flags)
-/* stringarg: the point in the string at which to begin matching */
-/* strend: pointer to null at end of string */
-/* strbeg: real beginning of string */
-/* minend: end of match must be >= minend bytes after stringarg. */
-/* sv: SV being matched: only used for utf8 flag, pos() etc; string
- * itself is accessed via the pointers above */
-/* data: May be used for some additional optimizations.
- Currently unused. */
-/* flags: For optimizations. See REXEC_* in regexp.h */
-
-{
- dVAR;
- struct regexp *const prog = ReANY(rx);
- char *s;
- regnode *c;
- char *startpos;
- SSize_t minlen; /* must match at least this many chars */
- SSize_t dontbother = 0; /* how many characters not to try at end */
- const bool utf8_target = cBOOL(DO_UTF8(sv));
- I32 multiline;
- RXi_GET_DECL(prog,progi);
- regmatch_info reginfo_buf; /* create some info to pass to regtry etc */
- regmatch_info *const reginfo = ®info_buf;
- regexp_paren_pair *swap = NULL;
- I32 oldsave;
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGEXEC_FLAGS;
- PERL_UNUSED_ARG(data);
-
- /* Be paranoid... */
- if (prog == NULL || stringarg == NULL) {
- Perl_croak(aTHX_ "NULL regexp parameter");
- }
-
- DEBUG_EXECUTE_r(
- debug_start_match(rx, utf8_target, stringarg, strend,
- "Matching");
- );
-
- startpos = stringarg;
-
- if (prog->intflags & PREGf_GPOS_SEEN) {
- MAGIC *mg;
-
- /* set reginfo->ganch, the position where \G can match */
-
- reginfo->ganch =
- (flags & REXEC_IGNOREPOS)
- ? stringarg /* use start pos rather than pos() */
- : (sv && (mg = mg_find_mglob(sv)) && mg->mg_len >= 0)
- /* Defined pos(): */
- ? strbeg + MgBYTEPOS(mg, sv, strbeg, strend-strbeg)
- : strbeg; /* pos() not defined; use start of string */
-
- DEBUG_GPOS_r(PerlIO_printf(Perl_debug_log,
- "GPOS ganch set to strbeg[%"IVdf"]\n", (IV)(reginfo->ganch - strbeg)));
-
- /* in the presence of \G, we may need to start looking earlier in
- * the string than the suggested start point of stringarg:
- * if prog->gofs is set, then that's a known, fixed minimum
- * offset, such as
- * /..\G/: gofs = 2
- * /ab|c\G/: gofs = 1
- * or if the minimum offset isn't known, then we have to go back
- * to the start of the string, e.g. /w+\G/
- */
-
- if (prog->intflags & PREGf_ANCH_GPOS) {
- startpos = reginfo->ganch - prog->gofs;
- if (startpos <
- ((flags & REXEC_FAIL_ON_UNDERFLOW) ? stringarg : strbeg))
- {
- DEBUG_r(PerlIO_printf(Perl_debug_log,
- "fail: ganch-gofs before earliest possible start\n"));
- return 0;
- }
- }
- else if (prog->gofs) {
- if (startpos - prog->gofs < strbeg)
- startpos = strbeg;
- else
- startpos -= prog->gofs;
- }
- else if (prog->intflags & PREGf_GPOS_FLOAT)
- startpos = strbeg;
- }
-
- minlen = prog->minlen;
- if ((startpos + minlen) > strend || startpos < strbeg) {
- DEBUG_r(PerlIO_printf(Perl_debug_log,
- "Regex match can't succeed, so not even tried\n"));
- return 0;
- }
-
- /* at the end of this function, we'll do a LEAVE_SCOPE(oldsave),
- * which will call destuctors to reset PL_regmatch_state, free higher
- * PL_regmatch_slabs, and clean up regmatch_info_aux and
- * regmatch_info_aux_eval */
-
- oldsave = PL_savestack_ix;
-
- s = startpos;
-
- if ((prog->extflags & RXf_USE_INTUIT)
- && !(flags & REXEC_CHECKED))
- {
- s = re_intuit_start(rx, sv, strbeg, startpos, strend,
- flags, NULL);
- if (!s)
- return 0;
-
- if (prog->extflags & RXf_CHECK_ALL) {
- /* we can match based purely on the result of INTUIT.
- * Set up captures etc just for $& and $-[0]
- * (an intuit-only match wont have $1,$2,..) */
- assert(!prog->nparens);
-
- /* s/// doesn't like it if $& is earlier than where we asked it to
- * start searching (which can happen on something like /.\G/) */
- if ( (flags & REXEC_FAIL_ON_UNDERFLOW)
- && (s < stringarg))
- {
- /* this should only be possible under \G */
- assert(prog->intflags & PREGf_GPOS_SEEN);
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "matched, but failing for REXEC_FAIL_ON_UNDERFLOW\n"));
- goto phooey;
- }
-
- /* match via INTUIT shouldn't have any captures.
- * Let @-, @+, $^N know */
- prog->lastparen = prog->lastcloseparen = 0;
- RX_MATCH_UTF8_set(rx, utf8_target);
- prog->offs[0].start = s - strbeg;
- prog->offs[0].end = utf8_target
- ? (char*)utf8_hop((U8*)s, prog->minlenret) - strbeg
- : s - strbeg + prog->minlenret;
- if ( !(flags & REXEC_NOT_FIRST) )
- S_reg_set_capture_string(aTHX_ rx,
- strbeg, strend,
- sv, flags, utf8_target);
-
- return 1;
- }
- }
-
- multiline = prog->extflags & RXf_PMf_MULTILINE;
-
- if (strend - s < (minlen+(prog->check_offset_min<0?prog->check_offset_min:0))) {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "String too short [regexec_flags]...\n"));
- goto phooey;
- }
-
- /* Check validity of program. */
- if (UCHARAT(progi->program) != REG_MAGIC) {
- Perl_croak(aTHX_ "corrupted regexp program");
- }
-
- RX_MATCH_TAINTED_off(rx);
-
- reginfo->prog = rx; /* Yes, sorry that this is confusing. */
- reginfo->intuit = 0;
- reginfo->is_utf8_target = cBOOL(utf8_target);
- reginfo->is_utf8_pat = cBOOL(RX_UTF8(rx));
- reginfo->warned = FALSE;
- reginfo->strbeg = strbeg;
- reginfo->sv = sv;
- reginfo->poscache_maxiter = 0; /* not yet started a countdown */
- reginfo->strend = strend;
- /* see how far we have to get to not match where we matched before */
- reginfo->till = stringarg + minend;
-
- if (prog->extflags & RXf_EVAL_SEEN && SvPADTMP(sv)) {
- /* SAVEFREESV, not sv_mortalcopy, as this SV must last until after
- S_cleanup_regmatch_info_aux has executed (registered by
- SAVEDESTRUCTOR_X below). S_cleanup_regmatch_info_aux modifies
- magic belonging to this SV.
- Not newSVsv, either, as it does not COW.
- */
- assert(!IS_PADGV(sv));
- reginfo->sv = newSV(0);
- SvSetSV_nosteal(reginfo->sv, sv);
- SAVEFREESV(reginfo->sv);
- }
-
- /* reserve next 2 or 3 slots in PL_regmatch_state:
- * slot N+0: may currently be in use: skip it
- * slot N+1: use for regmatch_info_aux struct
- * slot N+2: use for regmatch_info_aux_eval struct if we have (?{})'s
- * slot N+3: ready for use by regmatch()
- */
-
- {
- regmatch_state *old_regmatch_state;
- regmatch_slab *old_regmatch_slab;
- int i, max = (prog->extflags & RXf_EVAL_SEEN) ? 2 : 1;
-
- /* on first ever match, allocate first slab */
- if (!PL_regmatch_slab) {
- Newx(PL_regmatch_slab, 1, regmatch_slab);
- PL_regmatch_slab->prev = NULL;
- PL_regmatch_slab->next = NULL;
- PL_regmatch_state = SLAB_FIRST(PL_regmatch_slab);
- }
-
- old_regmatch_state = PL_regmatch_state;
- old_regmatch_slab = PL_regmatch_slab;
-
- for (i=0; i <= max; i++) {
- if (i == 1)
- reginfo->info_aux = &(PL_regmatch_state->u.info_aux);
- else if (i ==2)
- reginfo->info_aux_eval =
- reginfo->info_aux->info_aux_eval =
- &(PL_regmatch_state->u.info_aux_eval);
-
- if (++PL_regmatch_state > SLAB_LAST(PL_regmatch_slab))
- PL_regmatch_state = S_push_slab(aTHX);
- }
-
- /* note initial PL_regmatch_state position; at end of match we'll
- * pop back to there and free any higher slabs */
-
- reginfo->info_aux->old_regmatch_state = old_regmatch_state;
- reginfo->info_aux->old_regmatch_slab = old_regmatch_slab;
- reginfo->info_aux->poscache = NULL;
-
- SAVEDESTRUCTOR_X(S_cleanup_regmatch_info_aux, reginfo->info_aux);
-
- if ((prog->extflags & RXf_EVAL_SEEN))
- S_setup_eval_state(aTHX_ reginfo);
- else
- reginfo->info_aux_eval = reginfo->info_aux->info_aux_eval = NULL;
- }
-
- /* If there is a "must appear" string, look for it. */
-
- if (PL_curpm && (PM_GETRE(PL_curpm) == rx)) {
- /* We have to be careful. If the previous successful match
- was from this regex we don't want a subsequent partially
- successful match to clobber the old results.
- So when we detect this possibility we add a swap buffer
- to the re, and switch the buffer each match. If we fail,
- we switch it back; otherwise we leave it swapped.
- */
- swap = prog->offs;
- /* do we need a save destructor here for eval dies? */
- Newxz(prog->offs, (prog->nparens + 1), regexp_paren_pair);
- DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log,
- "rex=0x%"UVxf" saving offs: orig=0x%"UVxf" new=0x%"UVxf"\n",
- PTR2UV(prog),
- PTR2UV(swap),
- PTR2UV(prog->offs)
- ));
- }
-
- /* Simplest case: anchored match need be tried only once. */
- /* [unless only anchor is BOL and multiline is set] */
- if (prog->intflags & (PREGf_ANCH & ~PREGf_ANCH_GPOS)) {
- if (s == startpos && regtry(reginfo, &s))
- goto got_it;
- else if (multiline || (prog->intflags & (PREGf_IMPLICIT | PREGf_ANCH_MBOL))) /* XXXX SBOL? */
- {
- char *end;
-
- if (minlen)
- dontbother = minlen - 1;
- end = HOP3c(strend, -dontbother, strbeg) - 1;
- /* for multiline we only have to try after newlines */
- if (prog->check_substr || prog->check_utf8) {
- /* because of the goto we can not easily reuse the macros for bifurcating the
- unicode/non-unicode match modes here like we do elsewhere - demerphq */
- if (utf8_target) {
- if (s == startpos)
- goto after_try_utf8;
- while (1) {
- if (regtry(reginfo, &s)) {
- goto got_it;
- }
- after_try_utf8:
- if (s > end) {
- goto phooey;
- }
- if (prog->extflags & RXf_USE_INTUIT) {
- s = re_intuit_start(rx, sv, strbeg,
- s + UTF8SKIP(s), strend, flags, NULL);
- if (!s) {
- goto phooey;
- }
- }
- else {
- s += UTF8SKIP(s);
- }
- }
- } /* end search for check string in unicode */
- else {
- if (s == startpos) {
- goto after_try_latin;
- }
- while (1) {
- if (regtry(reginfo, &s)) {
- goto got_it;
- }
- after_try_latin:
- if (s > end) {
- goto phooey;
- }
- if (prog->extflags & RXf_USE_INTUIT) {
- s = re_intuit_start(rx, sv, strbeg,
- s + 1, strend, flags, NULL);
- if (!s) {
- goto phooey;
- }
- }
- else {
- s++;
- }
- }
- } /* end search for check string in latin*/
- } /* end search for check string */
- else { /* search for newline */
- if (s > startpos) {
- /*XXX: The s-- is almost definitely wrong here under unicode - demeprhq*/
- s--;
- }
- /* We can use a more efficient search as newlines are the same in unicode as they are in latin */
- while (s <= end) { /* note it could be possible to match at the end of the string */
- if (*s++ == '\n') { /* don't need PL_utf8skip here */
- if (regtry(reginfo, &s))
- goto got_it;
- }
- }
- } /* end search for newline */
- } /* end anchored/multiline check string search */
- goto phooey;
- } else if (prog->intflags & PREGf_ANCH_GPOS)
- {
- /* PREGf_ANCH_GPOS should never be true if PREGf_GPOS_SEEN is not true */
- assert(prog->intflags & PREGf_GPOS_SEEN);
- /* For anchored \G, the only position it can match from is
- * (ganch-gofs); we already set startpos to this above; if intuit
- * moved us on from there, we can't possibly succeed */
- assert(startpos == reginfo->ganch - prog->gofs);
- if (s == startpos && regtry(reginfo, &s))
- goto got_it;
- goto phooey;
- }
-
- /* Messy cases: unanchored match. */
- if ((prog->anchored_substr || prog->anchored_utf8) && prog->intflags & PREGf_SKIP) {
- /* we have /x+whatever/ */
- /* it must be a one character string (XXXX Except is_utf8_pat?) */
- char ch;
-#ifdef DEBUGGING
- int did_match = 0;
-#endif
- if (utf8_target) {
- if (! prog->anchored_utf8) {
- to_utf8_substr(prog);
- }
- ch = SvPVX_const(prog->anchored_utf8)[0];
- REXEC_FBC_SCAN(
- if (*s == ch) {
- DEBUG_EXECUTE_r( did_match = 1 );
- if (regtry(reginfo, &s)) goto got_it;
- s += UTF8SKIP(s);
- while (s < strend && *s == ch)
- s += UTF8SKIP(s);
- }
- );
-
- }
- else {
- if (! prog->anchored_substr) {
- if (! to_byte_substr(prog)) {
- NON_UTF8_TARGET_BUT_UTF8_REQUIRED(phooey);
- }
- }
- ch = SvPVX_const(prog->anchored_substr)[0];
- REXEC_FBC_SCAN(
- if (*s == ch) {
- DEBUG_EXECUTE_r( did_match = 1 );
- if (regtry(reginfo, &s)) goto got_it;
- s++;
- while (s < strend && *s == ch)
- s++;
- }
- );
- }
- DEBUG_EXECUTE_r(if (!did_match)
- PerlIO_printf(Perl_debug_log,
- "Did not find anchored character...\n")
- );
- }
- else if (prog->anchored_substr != NULL
- || prog->anchored_utf8 != NULL
- || ((prog->float_substr != NULL || prog->float_utf8 != NULL)
- && prog->float_max_offset < strend - s)) {
- SV *must;
- SSize_t back_max;
- SSize_t back_min;
- char *last;
- char *last1; /* Last position checked before */
-#ifdef DEBUGGING
- int did_match = 0;
-#endif
- if (prog->anchored_substr || prog->anchored_utf8) {
- if (utf8_target) {
- if (! prog->anchored_utf8) {
- to_utf8_substr(prog);
- }
- must = prog->anchored_utf8;
- }
- else {
- if (! prog->anchored_substr) {
- if (! to_byte_substr(prog)) {
- NON_UTF8_TARGET_BUT_UTF8_REQUIRED(phooey);
- }
- }
- must = prog->anchored_substr;
- }
- back_max = back_min = prog->anchored_offset;
- } else {
- if (utf8_target) {
- if (! prog->float_utf8) {
- to_utf8_substr(prog);
- }
- must = prog->float_utf8;
- }
- else {
- if (! prog->float_substr) {
- if (! to_byte_substr(prog)) {
- NON_UTF8_TARGET_BUT_UTF8_REQUIRED(phooey);
- }
- }
- must = prog->float_substr;
- }
- back_max = prog->float_max_offset;
- back_min = prog->float_min_offset;
- }
-
- if (back_min<0) {
- last = strend;
- } else {
- last = HOP3c(strend, /* Cannot start after this */
- -(SSize_t)(CHR_SVLEN(must)
- - (SvTAIL(must) != 0) + back_min), strbeg);
- }
- if (s > reginfo->strbeg)
- last1 = HOPc(s, -1);
- else
- last1 = s - 1; /* bogus */
-
- /* XXXX check_substr already used to find "s", can optimize if
- check_substr==must. */
- dontbother = 0;
- strend = HOPc(strend, -dontbother);
- while ( (s <= last) &&
- (s = fbm_instr((unsigned char*)HOP4c(s, back_min, strbeg, strend),
- (unsigned char*)strend, must,
- multiline ? FBMrf_MULTILINE : 0)) ) {
- DEBUG_EXECUTE_r( did_match = 1 );
- if (HOPc(s, -back_max) > last1) {
- last1 = HOPc(s, -back_min);
- s = HOPc(s, -back_max);
- }
- else {
- char * const t = (last1 >= reginfo->strbeg)
- ? HOPc(last1, 1) : last1 + 1;
-
- last1 = HOPc(s, -back_min);
- s = t;
- }
- if (utf8_target) {
- while (s <= last1) {
- if (regtry(reginfo, &s))
- goto got_it;
- if (s >= last1) {
- s++; /* to break out of outer loop */
- break;
- }
- s += UTF8SKIP(s);
- }
- }
- else {
- while (s <= last1) {
- if (regtry(reginfo, &s))
- goto got_it;
- s++;
- }
- }
- }
- DEBUG_EXECUTE_r(if (!did_match) {
- RE_PV_QUOTED_DECL(quoted, utf8_target, PERL_DEBUG_PAD_ZERO(0),
- SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
- PerlIO_printf(Perl_debug_log, "Did not find %s substr %s%s...\n",
- ((must == prog->anchored_substr || must == prog->anchored_utf8)
- ? "anchored" : "floating"),
- quoted, RE_SV_TAIL(must));
- });
- goto phooey;
- }
- else if ( (c = progi->regstclass) ) {
- if (minlen) {
- const OPCODE op = OP(progi->regstclass);
- /* don't bother with what can't match */
- if (PL_regkind[op] != EXACT && op != CANY && PL_regkind[op] != TRIE)
- strend = HOPc(strend, -(minlen - 1));
- }
- DEBUG_EXECUTE_r({
- SV * const prop = sv_newmortal();
- regprop(prog, prop, c, reginfo);
- {
- RE_PV_QUOTED_DECL(quoted,utf8_target,PERL_DEBUG_PAD_ZERO(1),
- s,strend-s,60);
- PerlIO_printf(Perl_debug_log,
- "Matching stclass %.*s against %s (%d bytes)\n",
- (int)SvCUR(prop), SvPVX_const(prop),
- quoted, (int)(strend - s));
- }
- });
- if (find_byclass(prog, c, s, strend, reginfo))
- goto got_it;
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Contradicts stclass... [regexec_flags]\n"));
- }
- else {
- dontbother = 0;
- if (prog->float_substr != NULL || prog->float_utf8 != NULL) {
- /* Trim the end. */
- char *last= NULL;
- SV* float_real;
- STRLEN len;
- const char *little;
-
- if (utf8_target) {
- if (! prog->float_utf8) {
- to_utf8_substr(prog);
- }
- float_real = prog->float_utf8;
- }
- else {
- if (! prog->float_substr) {
- if (! to_byte_substr(prog)) {
- NON_UTF8_TARGET_BUT_UTF8_REQUIRED(phooey);
- }
- }
- float_real = prog->float_substr;
- }
-
- little = SvPV_const(float_real, len);
- if (SvTAIL(float_real)) {
- /* This means that float_real contains an artificial \n on
- * the end due to the presence of something like this:
- * /foo$/ where we can match both "foo" and "foo\n" at the
- * end of the string. So we have to compare the end of the
- * string first against the float_real without the \n and
- * then against the full float_real with the string. We
- * have to watch out for cases where the string might be
- * smaller than the float_real or the float_real without
- * the \n. */
- char *checkpos= strend - len;
- DEBUG_OPTIMISE_r(
- PerlIO_printf(Perl_debug_log,
- "%sChecking for float_real.%s\n",
- PL_colors[4], PL_colors[5]));
- if (checkpos + 1 < strbeg) {
- /* can't match, even if we remove the trailing \n
- * string is too short to match */
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%sString shorter than required trailing substring, cannot match.%s\n",
- PL_colors[4], PL_colors[5]));
- goto phooey;
- } else if (memEQ(checkpos + 1, little, len - 1)) {
- /* can match, the end of the string matches without the
- * "\n" */
- last = checkpos + 1;
- } else if (checkpos < strbeg) {
- /* cant match, string is too short when the "\n" is
- * included */
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%sString does not contain required trailing substring, cannot match.%s\n",
- PL_colors[4], PL_colors[5]));
- goto phooey;
- } else if (!multiline) {
- /* non multiline match, so compare with the "\n" at the
- * end of the string */
- if (memEQ(checkpos, little, len)) {
- last= checkpos;
- } else {
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%sString does not contain required trailing substring, cannot match.%s\n",
- PL_colors[4], PL_colors[5]));
- goto phooey;
- }
- } else {
- /* multiline match, so we have to search for a place
- * where the full string is located */
- goto find_last;
- }
- } else {
- find_last:
- if (len)
- last = rninstr(s, strend, little, little + len);
- else
- last = strend; /* matching "$" */
- }
- if (!last) {
- /* at one point this block contained a comment which was
- * probably incorrect, which said that this was a "should not
- * happen" case. Even if it was true when it was written I am
- * pretty sure it is not anymore, so I have removed the comment
- * and replaced it with this one. Yves */
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "String does not contain required substring, cannot match.\n"
- ));
- goto phooey;
- }
- dontbother = strend - last + prog->float_min_offset;
- }
- if (minlen && (dontbother < minlen))
- dontbother = minlen - 1;
- strend -= dontbother; /* this one's always in bytes! */
- /* We don't know much -- general case. */
- if (utf8_target) {
- for (;;) {
- if (regtry(reginfo, &s))
- goto got_it;
- if (s >= strend)
- break;
- s += UTF8SKIP(s);
- };
- }
- else {
- do {
- if (regtry(reginfo, &s))
- goto got_it;
- } while (s++ < strend);
- }
- }
-
- /* Failure. */
- goto phooey;
-
-got_it:
- /* s/// doesn't like it if $& is earlier than where we asked it to
- * start searching (which can happen on something like /.\G/) */
- if ( (flags & REXEC_FAIL_ON_UNDERFLOW)
- && (prog->offs[0].start < stringarg - strbeg))
- {
- /* this should only be possible under \G */
- assert(prog->intflags & PREGf_GPOS_SEEN);
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "matched, but failing for REXEC_FAIL_ON_UNDERFLOW\n"));
- goto phooey;
- }
-
- DEBUG_BUFFERS_r(
- if (swap)
- PerlIO_printf(Perl_debug_log,
- "rex=0x%"UVxf" freeing offs: 0x%"UVxf"\n",
- PTR2UV(prog),
- PTR2UV(swap)
- );
- );
- Safefree(swap);
-
- /* clean up; this will trigger destructors that will free all slabs
- * above the current one, and cleanup the regmatch_info_aux
- * and regmatch_info_aux_eval sructs */
-
- LEAVE_SCOPE(oldsave);
-
- if (RXp_PAREN_NAMES(prog))
- (void)hv_iterinit(RXp_PAREN_NAMES(prog));
-
- RX_MATCH_UTF8_set(rx, utf8_target);
-
- /* make sure $`, $&, $', and $digit will work later */
- if ( !(flags & REXEC_NOT_FIRST) )
- S_reg_set_capture_string(aTHX_ rx,
- strbeg, reginfo->strend,
- sv, flags, utf8_target);
-
- return 1;
-
-phooey:
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch failed%s\n",
- PL_colors[4], PL_colors[5]));
-
- /* clean up; this will trigger destructors that will free all slabs
- * above the current one, and cleanup the regmatch_info_aux
- * and regmatch_info_aux_eval sructs */
-
- LEAVE_SCOPE(oldsave);
-
- if (swap) {
- /* we failed :-( roll it back */
- DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log,
- "rex=0x%"UVxf" rolling back offs: freeing=0x%"UVxf" restoring=0x%"UVxf"\n",
- PTR2UV(prog),
- PTR2UV(prog->offs),
- PTR2UV(swap)
- ));
- Safefree(prog->offs);
- prog->offs = swap;
- }
- return 0;
-}
-
-
-/* Set which rex is pointed to by PL_reg_curpm, handling ref counting.
- * Do inc before dec, in case old and new rex are the same */
-#define SET_reg_curpm(Re2) \
- if (reginfo->info_aux_eval) { \
- (void)ReREFCNT_inc(Re2); \
- ReREFCNT_dec(PM_GETRE(PL_reg_curpm)); \
- PM_SETRE((PL_reg_curpm), (Re2)); \
- }
-
-
-/*
- - regtry - try match at specific point
- */
-STATIC I32 /* 0 failure, 1 success */
-S_regtry(pTHX_ regmatch_info *reginfo, char **startposp)
-{
- dVAR;
- CHECKPOINT lastcp;
- REGEXP *const rx = reginfo->prog;
- regexp *const prog = ReANY(rx);
- SSize_t result;
- RXi_GET_DECL(prog,progi);
- GET_RE_DEBUG_FLAGS_DECL;
-
- PERL_ARGS_ASSERT_REGTRY;
-
- reginfo->cutpoint=NULL;
-
- prog->offs[0].start = *startposp - reginfo->strbeg;
- prog->lastparen = 0;
- prog->lastcloseparen = 0;
-
- /* XXXX What this code is doing here?!!! There should be no need
- to do this again and again, prog->lastparen should take care of
- this! --ilya*/
-
- /* Tests pat.t#187 and split.t#{13,14} seem to depend on this code.
- * Actually, the code in regcppop() (which Ilya may be meaning by
- * prog->lastparen), is not needed at all by the test suite
- * (op/regexp, op/pat, op/split), but that code is needed otherwise
- * this erroneously leaves $1 defined: "1" =~ /^(?:(\d)x)?\d$/
- * Meanwhile, this code *is* needed for the
- * above-mentioned test suite tests to succeed. The common theme
- * on those tests seems to be returning null fields from matches.
- * --jhi updated by dapm */
-#if 1
- if (prog->nparens) {
- regexp_paren_pair *pp = prog->offs;
- I32 i;
- for (i = prog->nparens; i > (I32)prog->lastparen; i--) {
- ++pp;
- pp->start = -1;
- pp->end = -1;
- }
- }
-#endif
- REGCP_SET(lastcp);
- result = regmatch(reginfo, *startposp, progi->program + 1);
- if (result != -1) {
- prog->offs[0].end = result;
- return 1;
- }
- if (reginfo->cutpoint)
- *startposp= reginfo->cutpoint;
- REGCP_UNWIND(lastcp);
- return 0;
-}
-
-
-#define sayYES goto yes
-#define sayNO goto no
-#define sayNO_SILENT goto no_silent
-
-/* we dont use STMT_START/END here because it leads to
- "unreachable code" warnings, which are bogus, but distracting. */
-#define CACHEsayNO \
- if (ST.cache_mask) \
- reginfo->info_aux->poscache[ST.cache_offset] |= ST.cache_mask; \
- sayNO
-
-/* this is used to determine how far from the left messages like
- 'failed...' are printed. It should be set such that messages
- are inline with the regop output that created them.
-*/
-#define REPORT_CODE_OFF 32
-
-
-#define CHRTEST_UNINIT -1001 /* c1/c2 haven't been calculated yet */
-#define CHRTEST_VOID -1000 /* the c1/c2 "next char" test should be skipped */
-#define CHRTEST_NOT_A_CP_1 -999
-#define CHRTEST_NOT_A_CP_2 -998
-
-/* grab a new slab and return the first slot in it */
-
-STATIC regmatch_state *
-S_push_slab(pTHX)
-{
-#if PERL_VERSION < 9 && !defined(PERL_CORE)
- dMY_CXT;
-#endif
- regmatch_slab *s = PL_regmatch_slab->next;
- if (!s) {
- Newx(s, 1, regmatch_slab);
- s->prev = PL_regmatch_slab;
- s->next = NULL;
- PL_regmatch_slab->next = s;
- }
- PL_regmatch_slab = s;
- return SLAB_FIRST(s);
-}
-
-
-/* push a new state then goto it */
-
-#define PUSH_STATE_GOTO(state, node, input) \
- pushinput = input; \
- scan = node; \
- st->resume_state = state; \
- goto push_state;
-
-/* push a new state with success backtracking, then goto it */
-
-#define PUSH_YES_STATE_GOTO(state, node, input) \
- pushinput = input; \
- scan = node; \
- st->resume_state = state; \
- goto push_yes_state;
-
-
-
-
-/*
-
-regmatch() - main matching routine
-
-This is basically one big switch statement in a loop. We execute an op,
-set 'next' to point the next op, and continue. If we come to a point which
-we may need to backtrack to on failure such as (A|B|C), we push a
-backtrack state onto the backtrack stack. On failure, we pop the top
-state, and re-enter the loop at the state indicated. If there are no more
-states to pop, we return failure.
-
-Sometimes we also need to backtrack on success; for example /A+/, where
-after successfully matching one A, we need to go back and try to
-match another one; similarly for lookahead assertions: if the assertion
-completes successfully, we backtrack to the state just before the assertion
-and then carry on. In these cases, the pushed state is marked as
-'backtrack on success too'. This marking is in fact done by a chain of
-pointers, each pointing to the previous 'yes' state. On success, we pop to
-the nearest yes state, discarding any intermediate failure-only states.
-Sometimes a yes state is pushed just to force some cleanup code to be
-called at the end of a successful match or submatch; e.g. (??{$re}) uses
-it to free the inner regex.
-
-Note that failure backtracking rewinds the cursor position, while
-success backtracking leaves it alone.
-
-A pattern is complete when the END op is executed, while a subpattern
-such as (?=foo) is complete when the SUCCESS op is executed. Both of these
-ops trigger the "pop to last yes state if any, otherwise return true"
-behaviour.
-
-A common convention in this function is to use A and B to refer to the two
-subpatterns (or to the first nodes thereof) in patterns like /A*B/: so A is
-the subpattern to be matched possibly multiple times, while B is the entire
-rest of the pattern. Variable and state names reflect this convention.
-
-The states in the main switch are the union of ops and failure/success of
-substates associated with with that op. For example, IFMATCH is the op
-that does lookahead assertions /(?=A)B/ and so the IFMATCH state means
-'execute IFMATCH'; while IFMATCH_A is a state saying that we have just
-successfully matched A and IFMATCH_A_fail is a state saying that we have
-just failed to match A. Resume states always come in pairs. The backtrack
-state we push is marked as 'IFMATCH_A', but when that is popped, we resume
-at IFMATCH_A or IFMATCH_A_fail, depending on whether we are backtracking
-on success or failure.
-
-The struct that holds a backtracking state is actually a big union, with
-one variant for each major type of op. The variable st points to the
-top-most backtrack struct. To make the code clearer, within each
-block of code we #define ST to alias the relevant union.
-
-Here's a concrete example of a (vastly oversimplified) IFMATCH
-implementation:
-
- switch (state) {
- ....
-
-#define ST st->u.ifmatch
-
- case IFMATCH: // we are executing the IFMATCH op, (?=A)B
- ST.foo = ...; // some state we wish to save
- ...
- // push a yes backtrack state with a resume value of
- // IFMATCH_A/IFMATCH_A_fail, then continue execution at the
- // first node of A:
- PUSH_YES_STATE_GOTO(IFMATCH_A, A, newinput);
- // NOTREACHED
-
- case IFMATCH_A: // we have successfully executed A; now continue with B
- next = B;
- bar = ST.foo; // do something with the preserved value
- break;
-
- case IFMATCH_A_fail: // A failed, so the assertion failed
- ...; // do some housekeeping, then ...
- sayNO; // propagate the failure
-
-#undef ST
-
- ...
- }
-
-For any old-timers reading this who are familiar with the old recursive
-approach, the code above is equivalent to:
-
- case IFMATCH: // we are executing the IFMATCH op, (?=A)B
- {
- int foo = ...
- ...
- if (regmatch(A)) {
- next = B;
- bar = foo;
- break;
- }
- ...; // do some housekeeping, then ...
- sayNO; // propagate the failure
- }
-
-The topmost backtrack state, pointed to by st, is usually free. If you
-want to claim it, populate any ST.foo fields in it with values you wish to
-save, then do one of
-
- PUSH_STATE_GOTO(resume_state, node, newinput);
- PUSH_YES_STATE_GOTO(resume_state, node, newinput);
-
-which sets that backtrack state's resume value to 'resume_state', pushes a
-new free entry to the top of the backtrack stack, then goes to 'node'.
-On backtracking, the free slot is popped, and the saved state becomes the
-new free state. An ST.foo field in this new top state can be temporarily
-accessed to retrieve values, but once the main loop is re-entered, it
-becomes available for reuse.
-
-Note that the depth of the backtrack stack constantly increases during the
-left-to-right execution of the pattern, rather than going up and down with
-the pattern nesting. For example the stack is at its maximum at Z at the
-end of the pattern, rather than at X in the following:
-
- /(((X)+)+)+....(Y)+....Z/
-
-The only exceptions to this are lookahead/behind assertions and the cut,
-(?>A), which pop all the backtrack states associated with A before
-continuing.
-
-Backtrack state structs are allocated in slabs of about 4K in size.
-PL_regmatch_state and st always point to the currently active state,
-and PL_regmatch_slab points to the slab currently containing
-PL_regmatch_state. The first time regmatch() is called, the first slab is
-allocated, and is never freed until interpreter destruction. When the slab
-is full, a new one is allocated and chained to the end. At exit from
-regmatch(), slabs allocated since entry are freed.
-
-*/
-
-
-#define DEBUG_STATE_pp(pp) \
- DEBUG_STATE_r({ \
- DUMP_EXEC_POS(locinput, scan, utf8_target); \
- PerlIO_printf(Perl_debug_log, \
- " %*s"pp" %s%s%s%s%s\n", \
- depth*2, "", \
- PL_reg_name[st->resume_state], \
- ((st==yes_state||st==mark_state) ? "[" : ""), \
- ((st==yes_state) ? "Y" : ""), \
- ((st==mark_state) ? "M" : ""), \
- ((st==yes_state||st==mark_state) ? "]" : "") \
- ); \
- });
-
-
-#define REG_NODE_NUM(x) ((x) ? (int)((x)-prog) : -1)
-
-#ifdef DEBUGGING
-
-STATIC void
-S_debug_start_match(pTHX_ const REGEXP *prog, const bool utf8_target,
- const char *start, const char *end, const char *blurb)
-{
- const bool utf8_pat = RX_UTF8(prog) ? 1 : 0;
-
- PERL_ARGS_ASSERT_DEBUG_START_MATCH;
-
- if (!PL_colorset)
- reginitcolors();
- {
- RE_PV_QUOTED_DECL(s0, utf8_pat, PERL_DEBUG_PAD_ZERO(0),
- RX_PRECOMP_const(prog), RX_PRELEN(prog), 60);
-
- RE_PV_QUOTED_DECL(s1, utf8_target, PERL_DEBUG_PAD_ZERO(1),
- start, end - start, 60);
-
- PerlIO_printf(Perl_debug_log,
- "%s%s REx%s %s against %s\n",
- PL_colors[4], blurb, PL_colors[5], s0, s1);
-
- if (utf8_target||utf8_pat)
- PerlIO_printf(Perl_debug_log, "UTF-8 %s%s%s...\n",
- utf8_pat ? "pattern" : "",
- utf8_pat && utf8_target ? " and " : "",
- utf8_target ? "string" : ""
- );
- }
-}
-
-STATIC void
-S_dump_exec_pos(pTHX_ const char *locinput,
- const regnode *scan,
- const char *loc_regeol,
- const char *loc_bostr,
- const char *loc_reg_starttry,
- const bool utf8_target)
-{
- const int docolor = *PL_colors[0] || *PL_colors[2] || *PL_colors[4];
- const int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */
- int l = (loc_regeol - locinput) > taill ? taill : (loc_regeol - locinput);
- /* The part of the string before starttry has one color
- (pref0_len chars), between starttry and current
- position another one (pref_len - pref0_len chars),
- after the current position the third one.
- We assume that pref0_len <= pref_len, otherwise we
- decrease pref0_len. */
- int pref_len = (locinput - loc_bostr) > (5 + taill) - l
- ? (5 + taill) - l : locinput - loc_bostr;
- int pref0_len;
-
- PERL_ARGS_ASSERT_DUMP_EXEC_POS;
-
- while (utf8_target && UTF8_IS_CONTINUATION(*(U8*)(locinput - pref_len)))
- pref_len++;
- pref0_len = pref_len - (locinput - loc_reg_starttry);
- if (l + pref_len < (5 + taill) && l < loc_regeol - locinput)
- l = ( loc_regeol - locinput > (5 + taill) - pref_len
- ? (5 + taill) - pref_len : loc_regeol - locinput);
- while (utf8_target && UTF8_IS_CONTINUATION(*(U8*)(locinput + l)))
- l--;
- if (pref0_len < 0)
- pref0_len = 0;
- if (pref0_len > pref_len)
- pref0_len = pref_len;
- {
- const int is_uni = (utf8_target && OP(scan) != CANY) ? 1 : 0;
-
- RE_PV_COLOR_DECL(s0,len0,is_uni,PERL_DEBUG_PAD(0),
- (locinput - pref_len),pref0_len, 60, 4, 5);
-
- RE_PV_COLOR_DECL(s1,len1,is_uni,PERL_DEBUG_PAD(1),
- (locinput - pref_len + pref0_len),
- pref_len - pref0_len, 60, 2, 3);
-
- RE_PV_COLOR_DECL(s2,len2,is_uni,PERL_DEBUG_PAD(2),
- locinput, loc_regeol - locinput, 10, 0, 1);
-
- const STRLEN tlen=len0+len1+len2;
- PerlIO_printf(Perl_debug_log,
- "%4"IVdf" <%.*s%.*s%s%.*s>%*s|",
- (IV)(locinput - loc_bostr),
- len0, s0,
- len1, s1,
- (docolor ? "" : "> <"),
- len2, s2,
- (int)(tlen > 19 ? 0 : 19 - tlen),
- "");
- }
-}
-
-#endif
-
-/* reg_check_named_buff_matched()
- * Checks to see if a named buffer has matched. The data array of
- * buffer numbers corresponding to the buffer is expected to reside
- * in the regexp->data->data array in the slot stored in the ARG() of
- * node involved. Note that this routine doesn't actually care about the
- * name, that information is not preserved from compilation to execution.
- * Returns the index of the leftmost defined buffer with the given name
- * or 0 if non of the buffers matched.
- */
-STATIC I32
-S_reg_check_named_buff_matched(const regexp *rex, const regnode *scan)
-{
- I32 n;
- RXi_GET_DECL(rex,rexi);
- SV *sv_dat= MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
- I32 *nums=(I32*)SvPVX(sv_dat);
-
- PERL_ARGS_ASSERT_REG_CHECK_NAMED_BUFF_MATCHED;
-
- for ( n=0; n<SvIVX(sv_dat); n++ ) {
- if ((I32)rex->lastparen >= nums[n] &&
- rex->offs[nums[n]].end != -1)
- {
- return nums[n];
- }
- }
- return 0;
-}
-
-
-static bool
-S_setup_EXACTISH_ST_c1_c2(pTHX_ const regnode * const text_node, int *c1p,
- U8* c1_utf8, int *c2p, U8* c2_utf8, regmatch_info *reginfo)
-{
- /* This function determines if there are one or two characters that match
- * the first character of the passed-in EXACTish node <text_node>, and if
- * so, returns them in the passed-in pointers.
- *
- * If it determines that no possible character in the target string can
- * match, it returns FALSE; otherwise TRUE. (The FALSE situation occurs if
- * the first character in <text_node> requires UTF-8 to represent, and the
- * target string isn't in UTF-8.)
- *
- * If there are more than two characters that could match the beginning of
- * <text_node>, or if more context is required to determine a match or not,
- * it sets both *<c1p> and *<c2p> to CHRTEST_VOID.
- *
- * The motiviation behind this function is to allow the caller to set up
- * tight loops for matching. If <text_node> is of type EXACT, there is
- * only one possible character that can match its first character, and so
- * the situation is quite simple. But things get much more complicated if
- * folding is involved. It may be that the first character of an EXACTFish
- * node doesn't participate in any possible fold, e.g., punctuation, so it
- * can be matched only by itself. The vast majority of characters that are
- * in folds match just two things, their lower and upper-case equivalents.
- * But not all are like that; some have multiple possible matches, or match
- * sequences of more than one character. This function sorts all that out.
- *
- * Consider the patterns A*B or A*?B where A and B are arbitrary. In a
- * loop of trying to match A*, we know we can't exit where the thing
- * following it isn't a B. And something can't be a B unless it is the
- * beginning of B. By putting a quick test for that beginning in a tight
- * loop, we can rule out things that can't possibly be B without having to
- * break out of the loop, thus avoiding work. Similarly, if A is a single
- * character, we can make a tight loop matching A*, using the outputs of
- * this function.
- *
- * If the target string to match isn't in UTF-8, and there aren't
- * complications which require CHRTEST_VOID, *<c1p> and *<c2p> are set to
- * the one or two possible octets (which are characters in this situation)
- * that can match. In all cases, if there is only one character that can
- * match, *<c1p> and *<c2p> will be identical.
- *
- * If the target string is in UTF-8, the buffers pointed to by <c1_utf8>
- * and <c2_utf8> will contain the one or two UTF-8 sequences of bytes that
- * can match the beginning of <text_node>. They should be declared with at
- * least length UTF8_MAXBYTES+1. (If the target string isn't in UTF-8, it is
- * undefined what these contain.) If one or both of the buffers are
- * invariant under UTF-8, *<c1p>, and *<c2p> will also be set to the
- * corresponding invariant. If variant, the corresponding *<c1p> and/or
- * *<c2p> will be set to a negative number(s) that shouldn't match any code
- * point (unless inappropriately coerced to unsigned). *<c1p> will equal
- * *<c2p> if and only if <c1_utf8> and <c2_utf8> are the same. */
-
- const bool utf8_target = reginfo->is_utf8_target;
-
- UV c1 = CHRTEST_NOT_A_CP_1;
- UV c2 = CHRTEST_NOT_A_CP_2;
- bool use_chrtest_void = FALSE;
- const bool is_utf8_pat = reginfo->is_utf8_pat;
-
- /* Used when we have both utf8 input and utf8 output, to avoid converting
- * to/from code points */
- bool utf8_has_been_setup = FALSE;
-
- dVAR;
-
- U8 *pat = (U8*)STRING(text_node);
- U8 folded[UTF8_MAX_FOLD_CHAR_EXPAND * UTF8_MAXBYTES_CASE + 1] = { '\0' };
-
- if (OP(text_node) == EXACT) {
-
- /* In an exact node, only one thing can be matched, that first
- * character. If both the pat and the target are UTF-8, we can just
- * copy the input to the output, avoiding finding the code point of
- * that character */
- if (!is_utf8_pat) {
- c2 = c1 = *pat;
- }
- else if (utf8_target) {
- Copy(pat, c1_utf8, UTF8SKIP(pat), U8);
- Copy(pat, c2_utf8, UTF8SKIP(pat), U8);
- utf8_has_been_setup = TRUE;
- }
- else {
- c2 = c1 = valid_utf8_to_uvchr(pat, NULL);
- }
- }
- else { /* an EXACTFish node */
- U8 *pat_end = pat + STR_LEN(text_node);
-
- /* An EXACTFL node has at least some characters unfolded, because what
- * they match is not known until now. So, now is the time to fold
- * the first few of them, as many as are needed to determine 'c1' and
- * 'c2' later in the routine. If the pattern isn't UTF-8, we only need
- * to fold if in a UTF-8 locale, and then only the Sharp S; everything
- * else is 1-1 and isn't assumed to be folded. In a UTF-8 pattern, we
- * need to fold as many characters as a single character can fold to,
- * so that later we can check if the first ones are such a multi-char
- * fold. But, in such a pattern only locale-problematic characters
- * aren't folded, so we can skip this completely if the first character
- * in the node isn't one of the tricky ones */
- if (OP(text_node) == EXACTFL) {
-
- if (! is_utf8_pat) {
- if (IN_UTF8_CTYPE_LOCALE && *pat == LATIN_SMALL_LETTER_SHARP_S)
- {
- folded[0] = folded[1] = 's';
- pat = folded;
- pat_end = folded + 2;
- }
- }
- else if (is_PROBLEMATIC_LOCALE_FOLDEDS_START_utf8(pat)) {
- U8 *s = pat;
- U8 *d = folded;
- int i;
-
- for (i = 0; i < UTF8_MAX_FOLD_CHAR_EXPAND && s < pat_end; i++) {
- if (isASCII(*s)) {
- *(d++) = (U8) toFOLD_LC(*s);
- s++;
- }
- else {
- STRLEN len;
- _to_utf8_fold_flags(s,
- d,
- &len,
- FOLD_FLAGS_FULL | FOLD_FLAGS_LOCALE);
- d += len;
- s += UTF8SKIP(s);
- }
- }
-
- pat = folded;
- pat_end = d;
- }
- }
-
- if ((is_utf8_pat && is_MULTI_CHAR_FOLD_utf8_safe(pat, pat_end))
- || (!is_utf8_pat && is_MULTI_CHAR_FOLD_latin1_safe(pat, pat_end)))
- {
- /* Multi-character folds require more context to sort out. Also
- * PL_utf8_foldclosures used below doesn't handle them, so have to
- * be handled outside this routine */
- use_chrtest_void = TRUE;
- }
- else { /* an EXACTFish node which doesn't begin with a multi-char fold */
- c1 = is_utf8_pat ? valid_utf8_to_uvchr(pat, NULL) : *pat;
- if (c1 > 255) {
- /* Load the folds hash, if not already done */
- SV** listp;
- if (! PL_utf8_foldclosures) {
- _load_PL_utf8_foldclosures();
- }
-
- /* 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 *) pat,
- UTF8SKIP(pat),
- FALSE))))
- {
- /* Not found in the hash, therefore there are no folds
- * containing it, so there is only a single character that
- * could match */
- c2 = c1;
- }
- else { /* Does participate in folds */
- AV* list = (AV*) *listp;
- if (av_tindex(list) != 1) {
-
- /* If there aren't exactly two folds to this, it is
- * outside the scope of this function */
- use_chrtest_void = TRUE;
- }
- else { /* There are two. Get them */
- SV** c_p = av_fetch(list, 0, FALSE);
- if (c_p == NULL) {
- Perl_croak(aTHX_ "panic: invalid PL_utf8_foldclosures structure");
- }
- c1 = SvUV(*c_p);
-
- c_p = av_fetch(list, 1, FALSE);
- if (c_p == NULL) {
- Perl_croak(aTHX_ "panic: invalid PL_utf8_foldclosures structure");
- }
- c2 = SvUV(*c_p);
-
- /* Folds that cross the 255/256 boundary are forbidden
- * if EXACTFL (and isnt a UTF8 locale), or EXACTFA and
- * one is ASCIII. Since the pattern character is above
- * 255, and its only other match is below 256, the only
- * legal match will be to itself. We have thrown away
- * the original, so have to compute which is the one
- * above 255. */
- if ((c1 < 256) != (c2 < 256)) {
- if ((OP(text_node) == EXACTFL
- && ! IN_UTF8_CTYPE_LOCALE)
- || ((OP(text_node) == EXACTFA
- || OP(text_node) == EXACTFA_NO_TRIE)
- && (isASCII(c1) || isASCII(c2))))
- {
- if (c1 < 256) {
- c1 = c2;
- }
- else {
- c2 = c1;
- }
- }
- }
- }
- }
- }
- else /* Here, c1 is <= 255 */
- if (utf8_target
- && HAS_NONLATIN1_FOLD_CLOSURE(c1)
- && ( ! (OP(text_node) == EXACTFL && ! IN_UTF8_CTYPE_LOCALE))
- && ((OP(text_node) != EXACTFA
- && OP(text_node) != EXACTFA_NO_TRIE)
- || ! isASCII(c1)))
- {
- /* Here, there could be something above Latin1 in the target
- * which folds to this character in the pattern. All such
- * cases except LATIN SMALL LETTER Y WITH DIAERESIS have more
- * than two characters involved in their folds, so are outside
- * the scope of this function */
- if (UNLIKELY(c1 == LATIN_SMALL_LETTER_Y_WITH_DIAERESIS)) {
- c2 = LATIN_CAPITAL_LETTER_Y_WITH_DIAERESIS;
- }
- else {
- use_chrtest_void = TRUE;
- }
- }
- else { /* Here nothing above Latin1 can fold to the pattern
- character */
- switch (OP(text_node)) {
-
- case EXACTFL: /* /l rules */
- c2 = PL_fold_locale[c1];
- break;
-
- case EXACTF: /* This node only generated for non-utf8
- patterns */
- assert(! is_utf8_pat);
- if (! utf8_target) { /* /d rules */
- c2 = PL_fold[c1];
- break;
- }
- /* FALLTHROUGH */
- /* /u rules for all these. This happens to work for
- * EXACTFA as nothing in Latin1 folds to ASCII */
- case EXACTFA_NO_TRIE: /* This node only generated for
- non-utf8 patterns */
- assert(! is_utf8_pat);
- /* FALLTHROUGH */
- case EXACTFA:
- case EXACTFU_SS:
- case EXACTFU:
- c2 = PL_fold_latin1[c1];
- break;
-
- default:
- Perl_croak(aTHX_ "panic: Unexpected op %u", OP(text_node));
- assert(0); /* NOTREACHED */
- }
- }
- }
- }
-
- /* Here have figured things out. Set up the returns */
- if (use_chrtest_void) {
- *c2p = *c1p = CHRTEST_VOID;
- }
- else if (utf8_target) {
- if (! utf8_has_been_setup) { /* Don't have the utf8; must get it */
- uvchr_to_utf8(c1_utf8, c1);
- uvchr_to_utf8(c2_utf8, c2);
- }
-
- /* Invariants are stored in both the utf8 and byte outputs; Use
- * negative numbers otherwise for the byte ones. Make sure that the
- * byte ones are the same iff the utf8 ones are the same */
- *c1p = (UTF8_IS_INVARIANT(*c1_utf8)) ? *c1_utf8 : CHRTEST_NOT_A_CP_1;
- *c2p = (UTF8_IS_INVARIANT(*c2_utf8))
- ? *c2_utf8
- : (c1 == c2)
- ? CHRTEST_NOT_A_CP_1
- : CHRTEST_NOT_A_CP_2;
- }
- else if (c1 > 255) {
- if (c2 > 255) { /* both possibilities are above what a non-utf8 string
- can represent */
- return FALSE;
- }
-
- *c1p = *c2p = c2; /* c2 is the only representable value */
- }
- else { /* c1 is representable; see about c2 */
- *c1p = c1;
- *c2p = (c2 < 256) ? c2 : c1;
- }
-
- return TRUE;
-}
-
-/* returns -1 on failure, $+[0] on success */
-STATIC SSize_t
-S_regmatch(pTHX_ regmatch_info *reginfo, char *startpos, regnode *prog)
-{
-#if PERL_VERSION < 9 && !defined(PERL_CORE)
- dMY_CXT;
-#endif
- dVAR;
- const bool utf8_target = reginfo->is_utf8_target;
- const U32 uniflags = UTF8_ALLOW_DEFAULT;
- REGEXP *rex_sv = reginfo->prog;
- regexp *rex = ReANY(rex_sv);
- RXi_GET_DECL(rex,rexi);
- /* the current state. This is a cached copy of PL_regmatch_state */
- regmatch_state *st;
- /* cache heavy used fields of st in registers */
- regnode *scan;
- regnode *next;
- U32 n = 0; /* general value; init to avoid compiler warning */
- SSize_t ln = 0; /* len or last; init to avoid compiler warning */
- char *locinput = startpos;
- char *pushinput; /* where to continue after a PUSH */
- I32 nextchr; /* is always set to UCHARAT(locinput) */
-
- bool result = 0; /* return value of S_regmatch */
- int depth = 0; /* depth of backtrack stack */
- U32 nochange_depth = 0; /* depth of GOSUB recursion with nochange */
- const U32 max_nochange_depth =
- (3 * rex->nparens > MAX_RECURSE_EVAL_NOCHANGE_DEPTH) ?
- 3 * rex->nparens : MAX_RECURSE_EVAL_NOCHANGE_DEPTH;
- regmatch_state *yes_state = NULL; /* state to pop to on success of
- subpattern */
- /* mark_state piggy backs on the yes_state logic so that when we unwind
- the stack on success we can update the mark_state as we go */
- regmatch_state *mark_state = NULL; /* last mark state we have seen */
- regmatch_state *cur_eval = NULL; /* most recent EVAL_AB state */
- struct regmatch_state *cur_curlyx = NULL; /* most recent curlyx */
- U32 state_num;
- bool no_final = 0; /* prevent failure from backtracking? */
- bool do_cutgroup = 0; /* no_final only until next branch/trie entry */
- char *startpoint = locinput;
- SV *popmark = NULL; /* are we looking for a mark? */
- SV *sv_commit = NULL; /* last mark name seen in failure */
- SV *sv_yes_mark = NULL; /* last mark name we have seen
- during a successful match */
- U32 lastopen = 0; /* last open we saw */
- bool has_cutgroup = RX_HAS_CUTGROUP(rex) ? 1 : 0;
- SV* const oreplsv = GvSVn(PL_replgv);
- /* these three flags are set by various ops to signal information to
- * the very next op. They have a useful lifetime of exactly one loop
- * iteration, and are not preserved or restored by state pushes/pops
- */
- bool sw = 0; /* the condition value in (?(cond)a|b) */
- bool minmod = 0; /* the next "{n,m}" is a "{n,m}?" */
- int logical = 0; /* the following EVAL is:
- 0: (?{...})
- 1: (?(?{...})X|Y)
- 2: (??{...})
- or the following IFMATCH/UNLESSM is:
- false: plain (?=foo)
- true: used as a condition: (?(?=foo))
- */
- PAD* last_pad = NULL;
- dMULTICALL;
- I32 gimme = G_SCALAR;
- CV *caller_cv = NULL; /* who called us */
- CV *last_pushed_cv = NULL; /* most recently called (?{}) CV */
- CHECKPOINT runops_cp; /* savestack position before executing EVAL */
- U32 maxopenparen = 0; /* max '(' index seen so far */
- int to_complement; /* Invert the result? */
- _char_class_number classnum;
- bool is_utf8_pat = reginfo->is_utf8_pat;
-
-#ifdef DEBUGGING
- GET_RE_DEBUG_FLAGS_DECL;
-#endif
-
- /* protect against undef(*^R) */
- SAVEFREESV(SvREFCNT_inc_simple_NN(oreplsv));
-
- /* shut up 'may be used uninitialized' compiler warnings for dMULTICALL */
- multicall_oldcatch = 0;
- multicall_cv = NULL;
- cx = NULL;
- PERL_UNUSED_VAR(multicall_cop);
- PERL_UNUSED_VAR(newsp);
-
-
- PERL_ARGS_ASSERT_REGMATCH;
-
- DEBUG_OPTIMISE_r( DEBUG_EXECUTE_r({
- PerlIO_printf(Perl_debug_log,"regmatch start\n");
- }));
-
- st = PL_regmatch_state;
-
- /* Note that nextchr is a byte even in UTF */
- SET_nextchr;
- scan = prog;
- while (scan != NULL) {
-
- DEBUG_EXECUTE_r( {
- SV * const prop = sv_newmortal();
- regnode *rnext=regnext(scan);
- DUMP_EXEC_POS( locinput, scan, utf8_target );
- regprop(rex, prop, scan, reginfo);
-
- PerlIO_printf(Perl_debug_log,
- "%3"IVdf":%*s%s(%"IVdf")\n",
- (IV)(scan - rexi->program), depth*2, "",
- SvPVX_const(prop),
- (PL_regkind[OP(scan)] == END || !rnext) ?
- 0 : (IV)(rnext - rexi->program));
- });
-
- next = scan + NEXT_OFF(scan);
- if (next == scan)
- next = NULL;
- state_num = OP(scan);
-
- REH_CALL_EXEC_NODE_HOOK(rex, scan, reginfo, st);
- reenter_switch:
- to_complement = 0;
-
- SET_nextchr;
- assert(nextchr < 256 && (nextchr >= 0 || nextchr == NEXTCHR_EOS));
-
- switch (state_num) {
- case BOL: /* /^../ */
- case SBOL: /* /^../s */
- if (locinput == reginfo->strbeg)
- break;
- sayNO;
-
- case MBOL: /* /^../m */
- if (locinput == reginfo->strbeg ||
- (!NEXTCHR_IS_EOS && locinput[-1] == '\n'))
- {
- break;
- }
- sayNO;
-
- case GPOS: /* \G */
- if (locinput == reginfo->ganch)
- break;
- sayNO;
-
- case KEEPS: /* \K */
- /* update the startpoint */
- st->u.keeper.val = rex->offs[0].start;
- rex->offs[0].start = locinput - reginfo->strbeg;
- PUSH_STATE_GOTO(KEEPS_next, next, locinput);
- assert(0); /*NOTREACHED*/
- case KEEPS_next_fail:
- /* rollback the start point change */
- rex->offs[0].start = st->u.keeper.val;
- sayNO_SILENT;
- assert(0); /*NOTREACHED*/
-
- case MEOL: /* /..$/m */
- if (!NEXTCHR_IS_EOS && nextchr != '\n')
- sayNO;
- break;
-
- case EOL: /* /..$/ */
- /* FALLTHROUGH */
- case SEOL: /* /..$/s */
- if (!NEXTCHR_IS_EOS && nextchr != '\n')
- sayNO;
- if (reginfo->strend - locinput > 1)
- sayNO;
- break;
-
- case EOS: /* \z */
- if (!NEXTCHR_IS_EOS)
- sayNO;
- break;
-
- case SANY: /* /./s */
- if (NEXTCHR_IS_EOS)
- sayNO;
- goto increment_locinput;
-
- case CANY: /* \C */
- if (NEXTCHR_IS_EOS)
- sayNO;
- locinput++;
- break;
-
- case REG_ANY: /* /./ */
- if ((NEXTCHR_IS_EOS) || nextchr == '\n')
- sayNO;
- goto increment_locinput;
-
-
-#undef ST
-#define ST st->u.trie
- case TRIEC: /* (ab|cd) with known charclass */
- /* In this case the charclass data is available inline so
- we can fail fast without a lot of extra overhead.
- */
- if(!NEXTCHR_IS_EOS && !ANYOF_BITMAP_TEST(scan, nextchr)) {
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s %sfailed to match trie start class...%s\n",
- REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
- );
- sayNO_SILENT;
- assert(0); /* NOTREACHED */
- }
- /* FALLTHROUGH */
- case TRIE: /* (ab|cd) */
- /* the basic plan of execution of the trie is:
- * At the beginning, run though all the states, and
- * find the longest-matching word. Also remember the position
- * of the shortest matching word. For example, this pattern:
- * 1 2 3 4 5
- * ab|a|x|abcd|abc
- * when matched against the string "abcde", will generate
- * accept states for all words except 3, with the longest
- * matching word being 4, and the shortest being 2 (with
- * the position being after char 1 of the string).
- *
- * Then for each matching word, in word order (i.e. 1,2,4,5),
- * we run the remainder of the pattern; on each try setting
- * the current position to the character following the word,
- * returning to try the next word on failure.
- *
- * We avoid having to build a list of words at runtime by
- * using a compile-time structure, wordinfo[].prev, which
- * gives, for each word, the previous accepting word (if any).
- * In the case above it would contain the mappings 1->2, 2->0,
- * 3->0, 4->5, 5->1. We can use this table to generate, from
- * the longest word (4 above), a list of all words, by
- * following the list of prev pointers; this gives us the
- * unordered list 4,5,1,2. Then given the current word we have
- * just tried, we can go through the list and find the
- * next-biggest word to try (so if we just failed on word 2,
- * the next in the list is 4).
- *
- * Since at runtime we don't record the matching position in
- * the string for each word, we have to work that out for
- * each word we're about to process. The wordinfo table holds
- * the character length of each word; given that we recorded
- * at the start: the position of the shortest word and its
- * length in chars, we just need to move the pointer the
- * difference between the two char lengths. Depending on
- * Unicode status and folding, that's cheap or expensive.
- *
- * This algorithm is optimised for the case where are only a
- * small number of accept states, i.e. 0,1, or maybe 2.
- * With lots of accepts states, and having to try all of them,
- * it becomes quadratic on number of accept states to find all
- * the next words.
- */
-
- {
- /* what type of TRIE am I? (utf8 makes this contextual) */
- DECL_TRIE_TYPE(scan);
-
- /* what trie are we using right now */
- reg_trie_data * const trie
- = (reg_trie_data*)rexi->data->data[ ARG( scan ) ];
- HV * widecharmap = MUTABLE_HV(rexi->data->data[ ARG( scan ) + 1 ]);
- U32 state = trie->startstate;
-
- if ( trie->bitmap
- && (NEXTCHR_IS_EOS || !TRIE_BITMAP_TEST(trie, nextchr)))
- {
- if (trie->states[ state ].wordnum) {
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s %smatched empty string...%s\n",
- REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
- );
- if (!trie->jump)
- break;
- } else {
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s %sfailed to match trie start class...%s\n",
- REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5])
- );
- sayNO_SILENT;
- }
- }
-
- {
- U8 *uc = ( U8* )locinput;
-
- STRLEN len = 0;
- STRLEN foldlen = 0;
- U8 *uscan = (U8*)NULL;
- U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
- U32 charcount = 0; /* how many input chars we have matched */
- U32 accepted = 0; /* have we seen any accepting states? */
-
- ST.jump = trie->jump;
- ST.me = scan;
- ST.firstpos = NULL;
- ST.longfold = FALSE; /* char longer if folded => it's harder */
- ST.nextword = 0;
-
- /* fully traverse the TRIE; note the position of the
- shortest accept state and the wordnum of the longest
- accept state */
-
- while ( state && uc <= (U8*)(reginfo->strend) ) {
- U32 base = trie->states[ state ].trans.base;
- UV uvc = 0;
- U16 charid = 0;
- U16 wordnum;
- wordnum = trie->states[ state ].wordnum;
-
- if (wordnum) { /* it's an accept state */
- if (!accepted) {
- accepted = 1;
- /* record first match position */
- if (ST.longfold) {
- ST.firstpos = (U8*)locinput;
- ST.firstchars = 0;
- }
- else {
- ST.firstpos = uc;
- ST.firstchars = charcount;
- }
- }
- if (!ST.nextword || wordnum < ST.nextword)
- ST.nextword = wordnum;
- ST.topword = wordnum;
- }
-
- DEBUG_TRIE_EXECUTE_r({
- DUMP_EXEC_POS( (char *)uc, scan, utf8_target );
- PerlIO_printf( Perl_debug_log,
- "%*s %sState: %4"UVxf" Accepted: %c ",
- 2+depth * 2, "", PL_colors[4],
- (UV)state, (accepted ? 'Y' : 'N'));
- });
-
- /* read a char and goto next state */
- if ( base && (foldlen || uc < (U8*)(reginfo->strend))) {
- I32 offset;
- REXEC_TRIE_READ_CHAR(trie_type, trie, widecharmap, uc,
- uscan, len, uvc, charid, foldlen,
- foldbuf, uniflags);
- charcount++;
- if (foldlen>0)
- ST.longfold = TRUE;
- if (charid &&
- ( ((offset =
- base + charid - 1 - trie->uniquecharcount)) >= 0)
-
- && ((U32)offset < trie->lasttrans)
- && trie->trans[offset].check == state)
- {
- state = trie->trans[offset].next;
- }
- else {
- state = 0;
- }
- uc += len;
-
- }
- else {
- state = 0;
- }
- DEBUG_TRIE_EXECUTE_r(
- PerlIO_printf( Perl_debug_log,
- "Charid:%3x CP:%4"UVxf" After State: %4"UVxf"%s\n",
- charid, uvc, (UV)state, PL_colors[5] );
- );
- }
- if (!accepted)
- sayNO;
-
- /* calculate total number of accept states */
- {
- U16 w = ST.topword;
- accepted = 0;
- while (w) {
- w = trie->wordinfo[w].prev;
- accepted++;
- }
- ST.accepted = accepted;
- }
-
- DEBUG_EXECUTE_r(
- PerlIO_printf( Perl_debug_log,
- "%*s %sgot %"IVdf" possible matches%s\n",
- REPORT_CODE_OFF + depth * 2, "",
- PL_colors[4], (IV)ST.accepted, PL_colors[5] );
- );
- goto trie_first_try; /* jump into the fail handler */
- }}
- assert(0); /* NOTREACHED */
-
- case TRIE_next_fail: /* we failed - try next alternative */
- {
- U8 *uc;
- if ( ST.jump) {
- REGCP_UNWIND(ST.cp);
- UNWIND_PAREN(ST.lastparen, ST.lastcloseparen);
- }
- if (!--ST.accepted) {
- DEBUG_EXECUTE_r({
- PerlIO_printf( Perl_debug_log,
- "%*s %sTRIE failed...%s\n",
- REPORT_CODE_OFF+depth*2, "",
- PL_colors[4],
- PL_colors[5] );
- });
- sayNO_SILENT;
- }
- {
- /* Find next-highest word to process. Note that this code
- * is O(N^2) per trie run (O(N) per branch), so keep tight */
- U16 min = 0;
- U16 word;
- U16 const nextword = ST.nextword;
- reg_trie_wordinfo * const wordinfo
- = ((reg_trie_data*)rexi->data->data[ARG(ST.me)])->wordinfo;
- for (word=ST.topword; word; word=wordinfo[word].prev) {
- if (word > nextword && (!min || word < min))
- min = word;
- }
- ST.nextword = min;
- }
-
- trie_first_try:
- if (do_cutgroup) {
- do_cutgroup = 0;
- no_final = 0;
- }
-
- if ( ST.jump) {
- ST.lastparen = rex->lastparen;
- ST.lastcloseparen = rex->lastcloseparen;
- REGCP_SET(ST.cp);
- }
-
- /* find start char of end of current word */
- {
- U32 chars; /* how many chars to skip */
- reg_trie_data * const trie
- = (reg_trie_data*)rexi->data->data[ARG(ST.me)];
-
- assert((trie->wordinfo[ST.nextword].len - trie->prefixlen)
- >= ST.firstchars);
- chars = (trie->wordinfo[ST.nextword].len - trie->prefixlen)
- - ST.firstchars;
- uc = ST.firstpos;
-
- if (ST.longfold) {
- /* the hard option - fold each char in turn and find
- * its folded length (which may be different */
- U8 foldbuf[UTF8_MAXBYTES_CASE + 1];
- STRLEN foldlen;
- STRLEN len;
- UV uvc;
- U8 *uscan;
-
- while (chars) {
- if (utf8_target) {
- uvc = utf8n_to_uvchr((U8*)uc, UTF8_MAXLEN, &len,
- uniflags);
- uc += len;
- }
- else {
- uvc = *uc;
- uc++;
- }
- uvc = to_uni_fold(uvc, foldbuf, &foldlen);
- uscan = foldbuf;
- while (foldlen) {
- if (!--chars)
- break;
- uvc = utf8n_to_uvchr(uscan, UTF8_MAXLEN, &len,
- uniflags);
- uscan += len;
- foldlen -= len;
- }
- }
- }
- else {
- if (utf8_target)
- while (chars--)
- uc += UTF8SKIP(uc);
- else
- uc += chars;
- }
- }
-
- scan = ST.me + ((ST.jump && ST.jump[ST.nextword])
- ? ST.jump[ST.nextword]
- : NEXT_OFF(ST.me));
-
- DEBUG_EXECUTE_r({
- PerlIO_printf( Perl_debug_log,
- "%*s %sTRIE matched word #%d, continuing%s\n",
- REPORT_CODE_OFF+depth*2, "",
- PL_colors[4],
- ST.nextword,
- PL_colors[5]
- );
- });
-
- if (ST.accepted > 1 || has_cutgroup) {
- PUSH_STATE_GOTO(TRIE_next, scan, (char*)uc);
- assert(0); /* NOTREACHED */
- }
- /* only one choice left - just continue */
- DEBUG_EXECUTE_r({
- AV *const trie_words
- = MUTABLE_AV(rexi->data->data[ARG(ST.me)+TRIE_WORDS_OFFSET]);
- SV ** const tmp = av_fetch( trie_words,
- ST.nextword-1, 0 );
- SV *sv= tmp ? sv_newmortal() : NULL;
-
- PerlIO_printf( Perl_debug_log,
- "%*s %sonly one match left, short-circuiting: #%d <%s>%s\n",
- REPORT_CODE_OFF+depth*2, "", PL_colors[4],
- ST.nextword,
- tmp ? pv_pretty(sv, SvPV_nolen_const(*tmp), SvCUR(*tmp), 0,
- PL_colors[0], PL_colors[1],
- (SvUTF8(*tmp) ? PERL_PV_ESCAPE_UNI : 0)|PERL_PV_ESCAPE_NONASCII
- )
- : "not compiled under -Dr",
- PL_colors[5] );
- });
-
- locinput = (char*)uc;
- continue; /* execute rest of RE */
- assert(0); /* NOTREACHED */
- }
-#undef ST
-
- case EXACT: { /* /abc/ */
- char *s = STRING(scan);
- ln = STR_LEN(scan);
- if (utf8_target != is_utf8_pat) {
- /* The target and the pattern have differing utf8ness. */
- char *l = locinput;
- const char * const e = s + ln;
-
- if (utf8_target) {
- /* The target is utf8, the pattern is not utf8.
- * Above-Latin1 code points can't match the pattern;
- * invariants match exactly, and the other Latin1 ones need
- * to be downgraded to a single byte in order to do the
- * comparison. (If we could be confident that the target
- * is not malformed, this could be refactored to have fewer
- * tests by just assuming that if the first bytes match, it
- * is an invariant, but there are tests in the test suite
- * dealing with (??{...}) which violate this) */
- while (s < e) {
- if (l >= reginfo->strend
- || UTF8_IS_ABOVE_LATIN1(* (U8*) l))
- {
- sayNO;
- }
- if (UTF8_IS_INVARIANT(*(U8*)l)) {
- if (*l != *s) {
- sayNO;
- }
- l++;
- }
- else {
- if (TWO_BYTE_UTF8_TO_NATIVE(*l, *(l+1)) != * (U8*) s)
- {
- sayNO;
- }
- l += 2;
- }
- s++;
- }
- }
- else {
- /* The target is not utf8, the pattern is utf8. */
- while (s < e) {
- if (l >= reginfo->strend
- || UTF8_IS_ABOVE_LATIN1(* (U8*) s))
- {
- sayNO;
- }
- if (UTF8_IS_INVARIANT(*(U8*)s)) {
- if (*s != *l) {
- sayNO;
- }
- s++;
- }
- else {
- if (TWO_BYTE_UTF8_TO_NATIVE(*s, *(s+1)) != * (U8*) l)
- {
- sayNO;
- }
- s += 2;
- }
- l++;
- }
- }
- locinput = l;
- }
- else {
- /* The target and the pattern have the same utf8ness. */
- /* Inline the first character, for speed. */
- if (reginfo->strend - locinput < ln
- || UCHARAT(s) != nextchr
- || (ln > 1 && memNE(s, locinput, ln)))
- {
- sayNO;
- }
- locinput += ln;
- }
- break;
- }
-
- case EXACTFL: { /* /abc/il */
- re_fold_t folder;
- const U8 * fold_array;
- const char * s;
- U32 fold_utf8_flags;
-
- folder = foldEQ_locale;
- fold_array = PL_fold_locale;
- fold_utf8_flags = FOLDEQ_LOCALE;
- goto do_exactf;
-
- case EXACTFU_SS: /* /\x{df}/iu */
- case EXACTFU: /* /abc/iu */
- folder = foldEQ_latin1;
- fold_array = PL_fold_latin1;
- fold_utf8_flags = is_utf8_pat ? FOLDEQ_S1_ALREADY_FOLDED : 0;
- goto do_exactf;
-
- case EXACTFA_NO_TRIE: /* This node only generated for non-utf8
- patterns */
- assert(! is_utf8_pat);
- /* FALLTHROUGH */
- case EXACTFA: /* /abc/iaa */
- folder = foldEQ_latin1;
- fold_array = PL_fold_latin1;
- fold_utf8_flags = FOLDEQ_UTF8_NOMIX_ASCII;
- goto do_exactf;
-
- case EXACTF: /* /abc/i This node only generated for
- non-utf8 patterns */
- assert(! is_utf8_pat);
- folder = foldEQ;
- fold_array = PL_fold;
- fold_utf8_flags = 0;
-
- do_exactf:
- s = STRING(scan);
- ln = STR_LEN(scan);
-
- if (utf8_target
- || is_utf8_pat
- || state_num == EXACTFU_SS
- || (state_num == EXACTFL && IN_UTF8_CTYPE_LOCALE))
- {
- /* Either target or the pattern are utf8, or has the issue where
- * the fold lengths may differ. */
- const char * const l = locinput;
- char *e = reginfo->strend;
-
- if (! foldEQ_utf8_flags(s, 0, ln, is_utf8_pat,
- l, &e, 0, utf8_target, fold_utf8_flags))
- {
- sayNO;
- }
- locinput = e;
- break;
- }
-
- /* Neither the target nor the pattern are utf8 */
- if (UCHARAT(s) != nextchr
- && !NEXTCHR_IS_EOS
- && UCHARAT(s) != fold_array[nextchr])
- {
- sayNO;
- }
- if (reginfo->strend - locinput < ln)
- sayNO;
- if (ln > 1 && ! folder(s, locinput, ln))
- sayNO;
- locinput += ln;
- break;
- }
-
- /* XXX Could improve efficiency by separating these all out using a
- * macro or in-line function. At that point regcomp.c would no longer
- * have to set the FLAGS fields of these */
- case BOUNDL: /* /\b/l */
- case NBOUNDL: /* /\B/l */
- case BOUND: /* /\b/ */
- case BOUNDU: /* /\b/u */
- case BOUNDA: /* /\b/a */
- case NBOUND: /* /\B/ */
- case NBOUNDU: /* /\B/u */
- case NBOUNDA: /* /\B/a */
- /* was last char in word? */
- if (utf8_target
- && FLAGS(scan) != REGEX_ASCII_RESTRICTED_CHARSET
- && FLAGS(scan) != REGEX_ASCII_MORE_RESTRICTED_CHARSET)
- {
- if (locinput == reginfo->strbeg)
- ln = '\n';
- else {
- const U8 * const r =
- reghop3((U8*)locinput, -1, (U8*)(reginfo->strbeg));
-
- ln = utf8n_to_uvchr(r, (U8*) reginfo->strend - r,
- 0, uniflags);
- }
- if (FLAGS(scan) != REGEX_LOCALE_CHARSET) {
- ln = isWORDCHAR_uni(ln);
- if (NEXTCHR_IS_EOS)
- n = 0;
- else {
- LOAD_UTF8_CHARCLASS_ALNUM();
- n = swash_fetch(PL_utf8_swash_ptrs[_CC_WORDCHAR], (U8*)locinput,
- utf8_target);
- }
- }
- else {
- ln = isWORDCHAR_LC_uvchr(ln);
- n = NEXTCHR_IS_EOS ? 0 : isWORDCHAR_LC_utf8((U8*)locinput);
- }
- }
- else {
-
- /* Here the string isn't utf8, or is utf8 and only ascii
- * characters are to match \w. In the latter case looking at
- * the byte just prior to the current one may be just the final
- * byte of a multi-byte character. This is ok. There are two
- * cases:
- * 1) it is a single byte character, and then the test is doing
- * just what it's supposed to.
- * 2) it is a multi-byte character, in which case the final
- * byte is never mistakable for ASCII, and so the test
- * will say it is not a word character, which is the
- * correct answer. */
- ln = (locinput != reginfo->strbeg) ?
- UCHARAT(locinput - 1) : '\n';
- switch (FLAGS(scan)) {
- case REGEX_UNICODE_CHARSET:
- ln = isWORDCHAR_L1(ln);
- n = NEXTCHR_IS_EOS ? 0 : isWORDCHAR_L1(nextchr);
- break;
- case REGEX_LOCALE_CHARSET:
- ln = isWORDCHAR_LC(ln);
- n = NEXTCHR_IS_EOS ? 0 : isWORDCHAR_LC(nextchr);
- break;
- case REGEX_DEPENDS_CHARSET:
- ln = isWORDCHAR(ln);
- n = NEXTCHR_IS_EOS ? 0 : isWORDCHAR(nextchr);
- break;
- case REGEX_ASCII_RESTRICTED_CHARSET:
- case REGEX_ASCII_MORE_RESTRICTED_CHARSET:
- ln = isWORDCHAR_A(ln);
- n = NEXTCHR_IS_EOS ? 0 : isWORDCHAR_A(nextchr);
- break;
- default:
- Perl_croak(aTHX_ "panic: Unexpected FLAGS %u in op %u", FLAGS(scan), OP(scan));
- }
- }
- /* Note requires that all BOUNDs be lower than all NBOUNDs in
- * regcomp.sym */
- if (((!ln) == (!n)) == (OP(scan) < NBOUND))
- sayNO;
- break;
-
- case ANYOF: /* /[abc]/ */
- if (NEXTCHR_IS_EOS)
- sayNO;
- if (utf8_target) {
- if (!reginclass(rex, scan, (U8*)locinput, (U8*)reginfo->strend,
- utf8_target))
- sayNO;
- locinput += UTF8SKIP(locinput);
- }
- else {
- if (!REGINCLASS(rex, scan, (U8*)locinput))
- sayNO;
- locinput++;
- }
- break;
-
- /* The argument (FLAGS) to all the POSIX node types is the class number
- * */
-
- case NPOSIXL: /* \W or [:^punct:] etc. under /l */
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXL: /* \w or [:punct:] etc. under /l */
- if (NEXTCHR_IS_EOS)
- sayNO;
-
- /* Use isFOO_lc() for characters within Latin1. (Note that
- * UTF8_IS_INVARIANT works even on non-UTF-8 strings, or else
- * wouldn't be invariant) */
- if (UTF8_IS_INVARIANT(nextchr) || ! utf8_target) {
- if (! (to_complement ^ cBOOL(isFOO_lc(FLAGS(scan), (U8) nextchr)))) {
- sayNO;
- }
- }
- else if (UTF8_IS_DOWNGRADEABLE_START(nextchr)) {
- if (! (to_complement ^ cBOOL(isFOO_lc(FLAGS(scan),
- (U8) TWO_BYTE_UTF8_TO_NATIVE(nextchr,
- *(locinput + 1))))))
- {
- sayNO;
- }
- }
- else { /* Here, must be an above Latin-1 code point */
- goto utf8_posix_not_eos;
- }
-
- /* Here, must be utf8 */
- locinput += UTF8SKIP(locinput);
- break;
-
- case NPOSIXD: /* \W or [:^punct:] etc. under /d */
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXD: /* \w or [:punct:] etc. under /d */
- if (utf8_target) {
- goto utf8_posix;
- }
- goto posixa;
-
- case NPOSIXA: /* \W or [:^punct:] etc. under /a */
-
- if (NEXTCHR_IS_EOS) {
- sayNO;
- }
-
- /* All UTF-8 variants match */
- if (! UTF8_IS_INVARIANT(nextchr)) {
- goto increment_locinput;
- }
-
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXA: /* \w or [:punct:] etc. under /a */
-
- posixa:
- /* We get here through POSIXD, NPOSIXD, and NPOSIXA when not in
- * UTF-8, and also from NPOSIXA even in UTF-8 when the current
- * character is a single byte */
-
- if (NEXTCHR_IS_EOS
- || ! (to_complement ^ cBOOL(_generic_isCC_A(nextchr,
- FLAGS(scan)))))
- {
- sayNO;
- }
-
- /* Here we are either not in utf8, or we matched a utf8-invariant,
- * so the next char is the next byte */
- locinput++;
- break;
-
- case NPOSIXU: /* \W or [:^punct:] etc. under /u */
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXU: /* \w or [:punct:] etc. under /u */
- utf8_posix:
- if (NEXTCHR_IS_EOS) {
- sayNO;
- }
- utf8_posix_not_eos:
-
- /* Use _generic_isCC() for characters within Latin1. (Note that
- * UTF8_IS_INVARIANT works even on non-UTF-8 strings, or else
- * wouldn't be invariant) */
- if (UTF8_IS_INVARIANT(nextchr) || ! utf8_target) {
- if (! (to_complement ^ cBOOL(_generic_isCC(nextchr,
- FLAGS(scan)))))
- {
- sayNO;
- }
- locinput++;
- }
- else if (UTF8_IS_DOWNGRADEABLE_START(nextchr)) {
- if (! (to_complement
- ^ cBOOL(_generic_isCC(TWO_BYTE_UTF8_TO_NATIVE(nextchr,
- *(locinput + 1)),
- FLAGS(scan)))))
- {
- sayNO;
- }
- locinput += 2;
- }
- else { /* Handle above Latin-1 code points */
- classnum = (_char_class_number) FLAGS(scan);
- if (classnum < _FIRST_NON_SWASH_CC) {
-
- /* Here, uses a swash to find such code points. Load if if
- * not done already */
- if (! PL_utf8_swash_ptrs[classnum]) {
- U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
- PL_utf8_swash_ptrs[classnum]
- = _core_swash_init("utf8",
- "",
- &PL_sv_undef, 1, 0,
- PL_XPosix_ptrs[classnum], &flags);
- }
- if (! (to_complement
- ^ cBOOL(swash_fetch(PL_utf8_swash_ptrs[classnum],
- (U8 *) locinput, TRUE))))
- {
- sayNO;
- }
- }
- else { /* Here, uses macros to find above Latin-1 code points */
- switch (classnum) {
- case _CC_ENUM_SPACE: /* XXX would require separate
- code if we revert the change
- of \v matching this */
- case _CC_ENUM_PSXSPC:
- if (! (to_complement
- ^ cBOOL(is_XPERLSPACE_high(locinput))))
- {
- sayNO;
- }
- break;
- case _CC_ENUM_BLANK:
- if (! (to_complement
- ^ cBOOL(is_HORIZWS_high(locinput))))
- {
- sayNO;
- }
- break;
- case _CC_ENUM_XDIGIT:
- if (! (to_complement
- ^ cBOOL(is_XDIGIT_high(locinput))))
- {
- sayNO;
- }
- break;
- case _CC_ENUM_VERTSPACE:
- if (! (to_complement
- ^ cBOOL(is_VERTWS_high(locinput))))
- {
- sayNO;
- }
- break;
- default: /* The rest, e.g. [:cntrl:], can't match
- above Latin1 */
- if (! to_complement) {
- sayNO;
- }
- break;
- }
- }
- locinput += UTF8SKIP(locinput);
- }
- break;
-
- case CLUMP: /* Match \X: logical Unicode character. This is defined as
- a Unicode extended Grapheme Cluster */
- /* From http://www.unicode.org/reports/tr29 (5.2 version). An
- extended Grapheme Cluster is:
-
- CR LF
- | Prepend* Begin Extend*
- | .
-
- Begin is: ( Special_Begin | ! Control )
- Special_Begin is: ( Regional-Indicator+ | Hangul-syllable )
- Extend is: ( Grapheme_Extend | Spacing_Mark )
- Control is: [ GCB_Control | CR | LF ]
- Hangul-syllable is: ( T+ | ( L* ( L | ( LVT | ( V | LV ) V* ) T* ) ))
-
- If we create a 'Regular_Begin' = Begin - Special_Begin, then
- we can rewrite
-
- Begin is ( Regular_Begin + Special Begin )
-
- It turns out that 98.4% of all Unicode code points match
- Regular_Begin. Doing it this way eliminates a table match in
- the previous implementation for almost all Unicode code points.
-
- There is a subtlety with Prepend* which showed up in testing.
- Note that the Begin, and only the Begin is required in:
- | Prepend* Begin Extend*
- Also, Begin contains '! Control'. A Prepend must be a
- '! Control', which means it must also be a Begin. What it
- comes down to is that if we match Prepend* and then find no
- suitable Begin afterwards, that if we backtrack the last
- Prepend, that one will be a suitable Begin.
- */
-
- if (NEXTCHR_IS_EOS)
- sayNO;
- if (! utf8_target) {
-
- /* Match either CR LF or '.', as all the other possibilities
- * require utf8 */
- locinput++; /* Match the . or CR */
- if (nextchr == '\r' /* And if it was CR, and the next is LF,
- match the LF */
- && locinput < reginfo->strend
- && UCHARAT(locinput) == '\n')
- {
- locinput++;
- }
- }
- else {
-
- /* Utf8: See if is ( CR LF ); already know that locinput <
- * reginfo->strend, so locinput+1 is in bounds */
- if ( nextchr == '\r' && locinput+1 < reginfo->strend
- && UCHARAT(locinput + 1) == '\n')
- {
- locinput += 2;
- }
- else {
- STRLEN len;
-
- /* In case have to backtrack to beginning, then match '.' */
- char *starting = locinput;
-
- /* In case have to backtrack the last prepend */
- char *previous_prepend = NULL;
-
- LOAD_UTF8_CHARCLASS_GCB();
-
- /* Match (prepend)* */
- while (locinput < reginfo->strend
- && (len = is_GCB_Prepend_utf8(locinput)))
- {
- previous_prepend = locinput;
- locinput += len;
- }
-
- /* As noted above, if we matched a prepend character, but
- * the next thing won't match, back off the last prepend we
- * matched, as it is guaranteed to match the begin */
- if (previous_prepend
- && (locinput >= reginfo->strend
- || (! swash_fetch(PL_utf8_X_regular_begin,
- (U8*)locinput, utf8_target)
- && ! is_GCB_SPECIAL_BEGIN_START_utf8(locinput)))
- )
- {
- locinput = previous_prepend;
- }
-
- /* Note that here we know reginfo->strend > locinput, as we
- * tested that upon input to this switch case, and if we
- * moved locinput forward, we tested the result just above
- * and it either passed, or we backed off so that it will
- * now pass */
- if (swash_fetch(PL_utf8_X_regular_begin,
- (U8*)locinput, utf8_target)) {
- locinput += UTF8SKIP(locinput);
- }
- else if (! is_GCB_SPECIAL_BEGIN_START_utf8(locinput)) {
-
- /* Here did not match the required 'Begin' in the
- * second term. So just match the very first
- * character, the '.' of the final term of the regex */
- locinput = starting + UTF8SKIP(starting);
- goto exit_utf8;
- } else {
-
- /* Here is a special begin. It can be composed of
- * several individual characters. One possibility is
- * RI+ */
- if ((len = is_GCB_RI_utf8(locinput))) {
- locinput += len;
- while (locinput < reginfo->strend
- && (len = is_GCB_RI_utf8(locinput)))
- {
- locinput += len;
- }
- } else if ((len = is_GCB_T_utf8(locinput))) {
- /* Another possibility is T+ */
- locinput += len;
- while (locinput < reginfo->strend
- && (len = is_GCB_T_utf8(locinput)))
- {
- locinput += len;
- }
- } else {
-
- /* Here, neither RI+ nor T+; must be some other
- * Hangul. That means it is one of the others: L,
- * LV, LVT or V, and matches:
- * L* (L | LVT T* | V * V* T* | LV V* T*) */
-
- /* Match L* */
- while (locinput < reginfo->strend
- && (len = is_GCB_L_utf8(locinput)))
- {
- locinput += len;
- }
-
- /* Here, have exhausted L*. If the next character
- * is not an LV, LVT nor V, it means we had to have
- * at least one L, so matches L+ in the original
- * equation, we have a complete hangul syllable.
- * Are done. */
-
- if (locinput < reginfo->strend
- && is_GCB_LV_LVT_V_utf8(locinput))
- {
- /* Otherwise keep going. Must be LV, LVT or V.
- * See if LVT, by first ruling out V, then LV */
- if (! is_GCB_V_utf8(locinput)
- /* All but every TCount one is LV */
- && (valid_utf8_to_uvchr((U8 *) locinput,
- NULL)
- - SBASE)
- % TCount != 0)
- {
- locinput += UTF8SKIP(locinput);
- } else {
-
- /* Must be V or LV. Take it, then match
- * V* */
- locinput += UTF8SKIP(locinput);
- while (locinput < reginfo->strend
- && (len = is_GCB_V_utf8(locinput)))
- {
- locinput += len;
- }
- }
-
- /* And any of LV, LVT, or V can be followed
- * by T* */
- while (locinput < reginfo->strend
- && (len = is_GCB_T_utf8(locinput)))
- {
- locinput += len;
- }
- }
- }
- }
-
- /* Match any extender */
- while (locinput < reginfo->strend
- && swash_fetch(PL_utf8_X_extend,
- (U8*)locinput, utf8_target))
- {
- locinput += UTF8SKIP(locinput);
- }
- }
- exit_utf8:
- if (locinput > reginfo->strend) sayNO;
- }
- break;
-
- case NREFFL: /* /\g{name}/il */
- { /* The capture buffer cases. The ones beginning with N for the
- named buffers just convert to the equivalent numbered and
- pretend they were called as the corresponding numbered buffer
- op. */
- /* don't initialize these in the declaration, it makes C++
- unhappy */
- const char *s;
- char type;
- re_fold_t folder;
- const U8 *fold_array;
- UV utf8_fold_flags;
-
- folder = foldEQ_locale;
- fold_array = PL_fold_locale;
- type = REFFL;
- utf8_fold_flags = FOLDEQ_LOCALE;
- goto do_nref;
-
- case NREFFA: /* /\g{name}/iaa */
- folder = foldEQ_latin1;
- fold_array = PL_fold_latin1;
- type = REFFA;
- utf8_fold_flags = FOLDEQ_UTF8_NOMIX_ASCII;
- goto do_nref;
-
- case NREFFU: /* /\g{name}/iu */
- folder = foldEQ_latin1;
- fold_array = PL_fold_latin1;
- type = REFFU;
- utf8_fold_flags = 0;
- goto do_nref;
-
- case NREFF: /* /\g{name}/i */
- folder = foldEQ;
- fold_array = PL_fold;
- type = REFF;
- utf8_fold_flags = 0;
- goto do_nref;
-
- case NREF: /* /\g{name}/ */
- type = REF;
- folder = NULL;
- fold_array = NULL;
- utf8_fold_flags = 0;
- do_nref:
-
- /* For the named back references, find the corresponding buffer
- * number */
- n = reg_check_named_buff_matched(rex,scan);
-
- if ( ! n ) {
- sayNO;
- }
- goto do_nref_ref_common;
-
- case REFFL: /* /\1/il */
- folder = foldEQ_locale;
- fold_array = PL_fold_locale;
- utf8_fold_flags = FOLDEQ_LOCALE;
- goto do_ref;
-
- case REFFA: /* /\1/iaa */
- folder = foldEQ_latin1;
- fold_array = PL_fold_latin1;
- utf8_fold_flags = FOLDEQ_UTF8_NOMIX_ASCII;
- goto do_ref;
-
- case REFFU: /* /\1/iu */
- folder = foldEQ_latin1;
- fold_array = PL_fold_latin1;
- utf8_fold_flags = 0;
- goto do_ref;
-
- case REFF: /* /\1/i */
- folder = foldEQ;
- fold_array = PL_fold;
- utf8_fold_flags = 0;
- goto do_ref;
-
- case REF: /* /\1/ */
- folder = NULL;
- fold_array = NULL;
- utf8_fold_flags = 0;
-
- do_ref:
- type = OP(scan);
- n = ARG(scan); /* which paren pair */
-
- do_nref_ref_common:
- ln = rex->offs[n].start;
- reginfo->poscache_iter = reginfo->poscache_maxiter; /* Void cache */
- if (rex->lastparen < n || ln == -1)
- sayNO; /* Do not match unless seen CLOSEn. */
- if (ln == rex->offs[n].end)
- break;
-
- s = reginfo->strbeg + ln;
- if (type != REF /* REF can do byte comparison */
- && (utf8_target || type == REFFU || type == REFFL))
- {
- char * limit = reginfo->strend;
-
- /* This call case insensitively compares the entire buffer
- * at s, with the current input starting at locinput, but
- * not going off the end given by reginfo->strend, and
- * returns in <limit> upon success, how much of the
- * current input was matched */
- if (! foldEQ_utf8_flags(s, NULL, rex->offs[n].end - ln, utf8_target,
- locinput, &limit, 0, utf8_target, utf8_fold_flags))
- {
- sayNO;
- }
- locinput = limit;
- break;
- }
-
- /* Not utf8: Inline the first character, for speed. */
- if (!NEXTCHR_IS_EOS &&
- UCHARAT(s) != nextchr &&
- (type == REF ||
- UCHARAT(s) != fold_array[nextchr]))
- sayNO;
- ln = rex->offs[n].end - ln;
- if (locinput + ln > reginfo->strend)
- sayNO;
- if (ln > 1 && (type == REF
- ? memNE(s, locinput, ln)
- : ! folder(s, locinput, ln)))
- sayNO;
- locinput += ln;
- break;
- }
-
- case NOTHING: /* null op; e.g. the 'nothing' following
- * the '*' in m{(a+|b)*}' */
- break;
- case TAIL: /* placeholder while compiling (A|B|C) */
- break;
-
- case BACK: /* ??? doesn't appear to be used ??? */
- break;
-
-#undef ST
-#define ST st->u.eval
- {
- SV *ret;
- REGEXP *re_sv;
- regexp *re;
- regexp_internal *rei;
- regnode *startpoint;
-
- case GOSTART: /* (?R) */
- case GOSUB: /* /(...(?1))/ /(...(?&foo))/ */
- if (cur_eval && cur_eval->locinput==locinput) {
- if (cur_eval->u.eval.close_paren == (U32)ARG(scan))
- Perl_croak(aTHX_ "Infinite recursion in regex");
- if ( ++nochange_depth > max_nochange_depth )
- Perl_croak(aTHX_
- "Pattern subroutine nesting without pos change"
- " exceeded limit in regex");
- } else {
- nochange_depth = 0;
- }
- re_sv = rex_sv;
- re = rex;
- rei = rexi;
- if (OP(scan)==GOSUB) {
- startpoint = scan + ARG2L(scan);
- ST.close_paren = ARG(scan);
- } else {
- startpoint = rei->program+1;
- ST.close_paren = 0;
- }
-
- /* Save all the positions seen so far. */
- ST.cp = regcppush(rex, 0, maxopenparen);
- REGCP_SET(ST.lastcp);
-
- /* and then jump to the code we share with EVAL */
- goto eval_recurse_doit;
-
- assert(0); /* NOTREACHED */
-
- case EVAL: /* /(?{A})B/ /(??{A})B/ and /(?(?{A})X|Y)B/ */
- if (cur_eval && cur_eval->locinput==locinput) {
- if ( ++nochange_depth > max_nochange_depth )
- Perl_croak(aTHX_ "EVAL without pos change exceeded limit in regex");
- } else {
- nochange_depth = 0;
- }
- {
- /* execute the code in the {...} */
-
- dSP;
- IV before;
- OP * const oop = PL_op;
- COP * const ocurcop = PL_curcop;
- OP *nop;
- CV *newcv;
-
- /* save *all* paren positions */
- regcppush(rex, 0, maxopenparen);
- REGCP_SET(runops_cp);
-
- if (!caller_cv)
- caller_cv = find_runcv(NULL);
-
- n = ARG(scan);
-
- if (rexi->data->what[n] == 'r') { /* code from an external qr */
- newcv = (ReANY(
- (REGEXP*)(rexi->data->data[n])
- ))->qr_anoncv
- ;
- nop = (OP*)rexi->data->data[n+1];
- }
- else if (rexi->data->what[n] == 'l') { /* literal code */
- newcv = caller_cv;
- nop = (OP*)rexi->data->data[n];
- assert(CvDEPTH(newcv));
- }
- else {
- /* literal with own CV */
- assert(rexi->data->what[n] == 'L');
- newcv = rex->qr_anoncv;
- nop = (OP*)rexi->data->data[n];
- }
-
- /* normally if we're about to execute code from the same
- * CV that we used previously, we just use the existing
- * CX stack entry. However, its possible that in the
- * meantime we may have backtracked, popped from the save
- * stack, and undone the SAVECOMPPAD(s) associated with
- * PUSH_MULTICALL; in which case PL_comppad no longer
- * points to newcv's pad. */
- if (newcv != last_pushed_cv || PL_comppad != last_pad)
- {
- U8 flags = (CXp_SUB_RE |
- ((newcv == caller_cv) ? CXp_SUB_RE_FAKE : 0));
- if (last_pushed_cv) {
- CHANGE_MULTICALL_FLAGS(newcv, flags);
- }
- else {
- PUSH_MULTICALL_FLAGS(newcv, flags);
- }
- last_pushed_cv = newcv;
- }
- else {
- /* these assignments are just to silence compiler
- * warnings */
- multicall_cop = NULL;
- newsp = NULL;
- }
- last_pad = PL_comppad;
-
- /* the initial nextstate you would normally execute
- * at the start of an eval (which would cause error
- * messages to come from the eval), may be optimised
- * away from the execution path in the regex code blocks;
- * so manually set PL_curcop to it initially */
- {
- OP *o = cUNOPx(nop)->op_first;
- assert(o->op_type == OP_NULL);
- if (o->op_targ == OP_SCOPE) {
- o = cUNOPo->op_first;
- }
- else {
- assert(o->op_targ == OP_LEAVE);
- o = cUNOPo->op_first;
- assert(o->op_type == OP_ENTER);
- o = o->op_sibling;
- }
-
- if (o->op_type != OP_STUB) {
- assert( o->op_type == OP_NEXTSTATE
- || o->op_type == OP_DBSTATE
- || (o->op_type == OP_NULL
- && ( o->op_targ == OP_NEXTSTATE
- || o->op_targ == OP_DBSTATE
- )
- )
- );
- PL_curcop = (COP*)o;
- }
- }
- nop = nop->op_next;
-
- DEBUG_STATE_r( PerlIO_printf(Perl_debug_log,
- " re EVAL PL_op=0x%"UVxf"\n", PTR2UV(nop)) );
-
- rex->offs[0].end = locinput - reginfo->strbeg;
- if (reginfo->info_aux_eval->pos_magic)
- MgBYTEPOS_set(reginfo->info_aux_eval->pos_magic,
- reginfo->sv, reginfo->strbeg,
- locinput - reginfo->strbeg);
-
- if (sv_yes_mark) {
- SV *sv_mrk = get_sv("REGMARK", 1);
- sv_setsv(sv_mrk, sv_yes_mark);
- }
-
- /* we don't use MULTICALL here as we want to call the
- * first op of the block of interest, rather than the
- * first op of the sub */
- before = (IV)(SP-PL_stack_base);
- PL_op = nop;
- CALLRUNOPS(aTHX); /* Scalar context. */
- SPAGAIN;
- if ((IV)(SP-PL_stack_base) == before)
- ret = &PL_sv_undef; /* protect against empty (?{}) blocks. */
- else {
- ret = POPs;
- PUTBACK;
- }
-
- /* before restoring everything, evaluate the returned
- * value, so that 'uninit' warnings don't use the wrong
- * PL_op or pad. Also need to process any magic vars
- * (e.g. $1) *before* parentheses are restored */
-
- PL_op = NULL;
-
- re_sv = NULL;
- if (logical == 0) /* (?{})/ */
- sv_setsv(save_scalar(PL_replgv), ret); /* $^R */
- else if (logical == 1) { /* /(?(?{...})X|Y)/ */
- sw = cBOOL(SvTRUE(ret));
- logical = 0;
- }
- else { /* /(??{}) */
- /* if its overloaded, let the regex compiler handle
- * it; otherwise extract regex, or stringify */
- if (SvGMAGICAL(ret))
- ret = sv_mortalcopy(ret);
- if (!SvAMAGIC(ret)) {
- SV *sv = ret;
- if (SvROK(sv))
- sv = SvRV(sv);
- if (SvTYPE(sv) == SVt_REGEXP)
- re_sv = (REGEXP*) sv;
- else if (SvSMAGICAL(ret)) {
- MAGIC *mg = mg_find(ret, PERL_MAGIC_qr);
- if (mg)
- re_sv = (REGEXP *) mg->mg_obj;
- }
-
- /* force any undef warnings here */
- if (!re_sv && !SvPOK(ret) && !SvNIOK(ret)) {
- ret = sv_mortalcopy(ret);
- (void) SvPV_force_nolen(ret);
- }
- }
-
- }
-
- /* *** Note that at this point we don't restore
- * PL_comppad, (or pop the CxSUB) on the assumption it may
- * be used again soon. This is safe as long as nothing
- * in the regexp code uses the pad ! */
- PL_op = oop;
- PL_curcop = ocurcop;
- S_regcp_restore(aTHX_ rex, runops_cp, &maxopenparen);
- PL_curpm = PL_reg_curpm;
-
- if (logical != 2)
- break;
- }
-
- /* only /(??{})/ from now on */
- logical = 0;
- {
- /* extract RE object from returned value; compiling if
- * necessary */
-
- if (re_sv) {
- re_sv = reg_temp_copy(NULL, re_sv);
- }
- else {
- U32 pm_flags = 0;
-
- if (SvUTF8(ret) && IN_BYTES) {
- /* In use 'bytes': make a copy of the octet
- * sequence, but without the flag on */
- STRLEN len;
- const char *const p = SvPV(ret, len);
- ret = newSVpvn_flags(p, len, SVs_TEMP);
- }
- if (rex->intflags & PREGf_USE_RE_EVAL)
- pm_flags |= PMf_USE_RE_EVAL;
-
- /* if we got here, it should be an engine which
- * supports compiling code blocks and stuff */
- assert(rex->engine && rex->engine->op_comp);
- assert(!(scan->flags & ~RXf_PMf_COMPILETIME));
- re_sv = rex->engine->op_comp(aTHX_ &ret, 1, NULL,
- rex->engine, NULL, NULL,
- /* copy /msix etc to inner pattern */
- scan->flags,
- pm_flags);
-
- if (!(SvFLAGS(ret)
- & (SVs_TEMP | SVs_GMG | SVf_ROK))
- && (!SvPADTMP(ret) || SvREADONLY(ret))) {
- /* This isn't a first class regexp. Instead, it's
- caching a regexp onto an existing, Perl visible
- scalar. */
- sv_magic(ret, MUTABLE_SV(re_sv), PERL_MAGIC_qr, 0, 0);
- }
- }
- SAVEFREESV(re_sv);
- re = ReANY(re_sv);
- }
- RXp_MATCH_COPIED_off(re);
- re->subbeg = rex->subbeg;
- re->sublen = rex->sublen;
- re->suboffset = rex->suboffset;
- re->subcoffset = rex->subcoffset;
- re->lastparen = 0;
- re->lastcloseparen = 0;
- rei = RXi_GET(re);
- DEBUG_EXECUTE_r(
- debug_start_match(re_sv, utf8_target, locinput,
- reginfo->strend, "Matching embedded");
- );
- startpoint = rei->program + 1;
- ST.close_paren = 0; /* only used for GOSUB */
- /* Save all the seen positions so far. */
- ST.cp = regcppush(rex, 0, maxopenparen);
- REGCP_SET(ST.lastcp);
- /* and set maxopenparen to 0, since we are starting a "fresh" match */
- maxopenparen = 0;
- /* run the pattern returned from (??{...}) */
-
- eval_recurse_doit: /* Share code with GOSUB below this line
- * At this point we expect the stack context to be
- * set up correctly */
-
- /* invalidate the S-L poscache. We're now executing a
- * different set of WHILEM ops (and their associated
- * indexes) against the same string, so the bits in the
- * cache are meaningless. Setting maxiter to zero forces
- * the cache to be invalidated and zeroed before reuse.
- * XXX This is too dramatic a measure. Ideally we should
- * save the old cache and restore when running the outer
- * pattern again */
- reginfo->poscache_maxiter = 0;
-
- /* the new regexp might have a different is_utf8_pat than we do */
- is_utf8_pat = reginfo->is_utf8_pat = cBOOL(RX_UTF8(re_sv));
-
- ST.prev_rex = rex_sv;
- ST.prev_curlyx = cur_curlyx;
- rex_sv = re_sv;
- SET_reg_curpm(rex_sv);
- rex = re;
- rexi = rei;
- cur_curlyx = NULL;
- ST.B = next;
- ST.prev_eval = cur_eval;
- cur_eval = st;
- /* now continue from first node in postoned RE */
- PUSH_YES_STATE_GOTO(EVAL_AB, startpoint, locinput);
- assert(0); /* NOTREACHED */
- }
-
- case EVAL_AB: /* cleanup after a successful (??{A})B */
- /* note: this is called twice; first after popping B, then A */
- rex_sv = ST.prev_rex;
- is_utf8_pat = reginfo->is_utf8_pat = cBOOL(RX_UTF8(rex_sv));
- SET_reg_curpm(rex_sv);
- rex = ReANY(rex_sv);
- rexi = RXi_GET(rex);
- {
- /* preserve $^R across LEAVE's. See Bug 121070. */
- SV *save_sv= GvSV(PL_replgv);
- SvREFCNT_inc(save_sv);
- regcpblow(ST.cp); /* LEAVE in disguise */
- sv_setsv(GvSV(PL_replgv), save_sv);
- SvREFCNT_dec(save_sv);
- }
- cur_eval = ST.prev_eval;
- cur_curlyx = ST.prev_curlyx;
-
- /* Invalidate cache. See "invalidate" comment above. */
- reginfo->poscache_maxiter = 0;
- if ( nochange_depth )
- nochange_depth--;
- sayYES;
-
-
- case EVAL_AB_fail: /* unsuccessfully ran A or B in (??{A})B */
- /* note: this is called twice; first after popping B, then A */
- rex_sv = ST.prev_rex;
- is_utf8_pat = reginfo->is_utf8_pat = cBOOL(RX_UTF8(rex_sv));
- SET_reg_curpm(rex_sv);
- rex = ReANY(rex_sv);
- rexi = RXi_GET(rex);
-
- REGCP_UNWIND(ST.lastcp);
- regcppop(rex, &maxopenparen);
- cur_eval = ST.prev_eval;
- cur_curlyx = ST.prev_curlyx;
- /* Invalidate cache. See "invalidate" comment above. */
- reginfo->poscache_maxiter = 0;
- if ( nochange_depth )
- nochange_depth--;
- sayNO_SILENT;
-#undef ST
-
- case OPEN: /* ( */
- n = ARG(scan); /* which paren pair */
- rex->offs[n].start_tmp = locinput - reginfo->strbeg;
- if (n > maxopenparen)
- maxopenparen = n;
- DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log,
- "rex=0x%"UVxf" offs=0x%"UVxf": \\%"UVuf": set %"IVdf" tmp; maxopenparen=%"UVuf"\n",
- PTR2UV(rex),
- PTR2UV(rex->offs),
- (UV)n,
- (IV)rex->offs[n].start_tmp,
- (UV)maxopenparen
- ));
- lastopen = n;
- break;
-
-/* XXX really need to log other places start/end are set too */
-#define CLOSE_CAPTURE \
- rex->offs[n].start = rex->offs[n].start_tmp; \
- rex->offs[n].end = locinput - reginfo->strbeg; \
- DEBUG_BUFFERS_r(PerlIO_printf(Perl_debug_log, \
- "rex=0x%"UVxf" offs=0x%"UVxf": \\%"UVuf": set %"IVdf"..%"IVdf"\n", \
- PTR2UV(rex), \
- PTR2UV(rex->offs), \
- (UV)n, \
- (IV)rex->offs[n].start, \
- (IV)rex->offs[n].end \
- ))
-
- case CLOSE: /* ) */
- n = ARG(scan); /* which paren pair */
- CLOSE_CAPTURE;
- if (n > rex->lastparen)
- rex->lastparen = n;
- rex->lastcloseparen = n;
- if (cur_eval && cur_eval->u.eval.close_paren == n) {
- goto fake_end;
- }
- break;
-
- case ACCEPT: /* (*ACCEPT) */
- if (ARG(scan)){
- regnode *cursor;
- for (cursor=scan;
- cursor && OP(cursor)!=END;
- cursor=regnext(cursor))
- {
- if ( OP(cursor)==CLOSE ){
- n = ARG(cursor);
- if ( n <= lastopen ) {
- CLOSE_CAPTURE;
- if (n > rex->lastparen)
- rex->lastparen = n;
- rex->lastcloseparen = n;
- if ( n == ARG(scan) || (cur_eval &&
- cur_eval->u.eval.close_paren == n))
- break;
- }
- }
- }
- }
- goto fake_end;
- /*NOTREACHED*/
-
- case GROUPP: /* (?(1)) */
- n = ARG(scan); /* which paren pair */
- sw = cBOOL(rex->lastparen >= n && rex->offs[n].end != -1);
- break;
-
- case NGROUPP: /* (?(<name>)) */
- /* reg_check_named_buff_matched returns 0 for no match */
- sw = cBOOL(0 < reg_check_named_buff_matched(rex,scan));
- break;
-
- case INSUBP: /* (?(R)) */
- n = ARG(scan);
- sw = (cur_eval && (!n || cur_eval->u.eval.close_paren == n));
- break;
-
- case DEFINEP: /* (?(DEFINE)) */
- sw = 0;
- break;
-
- case IFTHEN: /* (?(cond)A|B) */
- reginfo->poscache_iter = reginfo->poscache_maxiter; /* Void cache */
- if (sw)
- next = NEXTOPER(NEXTOPER(scan));
- else {
- next = scan + ARG(scan);
- if (OP(next) == IFTHEN) /* Fake one. */
- next = NEXTOPER(NEXTOPER(next));
- }
- break;
-
- case LOGICAL: /* modifier for EVAL and IFMATCH */
- logical = scan->flags;
- break;
-
-/*******************************************************************
-
-The CURLYX/WHILEM pair of ops handle the most generic case of the /A*B/
-pattern, where A and B are subpatterns. (For simple A, CURLYM or
-STAR/PLUS/CURLY/CURLYN are used instead.)
-
-A*B is compiled as <CURLYX><A><WHILEM><B>
-
-On entry to the subpattern, CURLYX is called. This pushes a CURLYX
-state, which contains the current count, initialised to -1. It also sets
-cur_curlyx to point to this state, with any previous value saved in the
-state block.
-
-CURLYX then jumps straight to the WHILEM op, rather than executing A,
-since the pattern may possibly match zero times (i.e. it's a while {} loop
-rather than a do {} while loop).
-
-Each entry to WHILEM represents a successful match of A. The count in the
-CURLYX block is incremented, another WHILEM state is pushed, and execution
-passes to A or B depending on greediness and the current count.
-
-For example, if matching against the string a1a2a3b (where the aN are
-substrings that match /A/), then the match progresses as follows: (the
-pushed states are interspersed with the bits of strings matched so far):
-
- <CURLYX cnt=-1>
- <CURLYX cnt=0><WHILEM>
- <CURLYX cnt=1><WHILEM> a1 <WHILEM>
- <CURLYX cnt=2><WHILEM> a1 <WHILEM> a2 <WHILEM>
- <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM>
- <CURLYX cnt=3><WHILEM> a1 <WHILEM> a2 <WHILEM> a3 <WHILEM> b
-
-(Contrast this with something like CURLYM, which maintains only a single
-backtrack state:
-
- <CURLYM cnt=0> a1
- a1 <CURLYM cnt=1> a2
- a1 a2 <CURLYM cnt=2> a3
- a1 a2 a3 <CURLYM cnt=3> b
-)
-
-Each WHILEM state block marks a point to backtrack to upon partial failure
-of A or B, and also contains some minor state data related to that
-iteration. The CURLYX block, pointed to by cur_curlyx, contains the
-overall state, such as the count, and pointers to the A and B ops.
-
-This is complicated slightly by nested CURLYX/WHILEM's. Since cur_curlyx
-must always point to the *current* CURLYX block, the rules are:
-
-When executing CURLYX, save the old cur_curlyx in the CURLYX state block,
-and set cur_curlyx to point the new block.
-
-When popping the CURLYX block after a successful or unsuccessful match,
-restore the previous cur_curlyx.
-
-When WHILEM is about to execute B, save the current cur_curlyx, and set it
-to the outer one saved in the CURLYX block.
-
-When popping the WHILEM block after a successful or unsuccessful B match,
-restore the previous cur_curlyx.
-
-Here's an example for the pattern (AI* BI)*BO
-I and O refer to inner and outer, C and W refer to CURLYX and WHILEM:
-
-cur_
-curlyx backtrack stack
------- ---------------
-NULL
-CO <CO prev=NULL> <WO>
-CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai
-CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi
-NULL <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi <WO prev=CO> bo
-
-At this point the pattern succeeds, and we work back down the stack to
-clean up, restoring as we go:
-
-CO <CO prev=NULL> <WO> <CI prev=CO> <WI> ai <WI prev=CI> bi
-CI <CO prev=NULL> <WO> <CI prev=CO> <WI> ai
-CO <CO prev=NULL> <WO>
-NULL
-
-*******************************************************************/
-
-#define ST st->u.curlyx
-
- case CURLYX: /* start of /A*B/ (for complex A) */
- {
- /* No need to save/restore up to this paren */
- I32 parenfloor = scan->flags;
-
- assert(next); /* keep Coverity happy */
- if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */
- next += ARG(next);
-
- /* XXXX Probably it is better to teach regpush to support
- parenfloor > maxopenparen ... */
- if (parenfloor > (I32)rex->lastparen)
- parenfloor = rex->lastparen; /* Pessimization... */
-
- ST.prev_curlyx= cur_curlyx;
- cur_curlyx = st;
- ST.cp = PL_savestack_ix;
-
- /* these fields contain the state of the current curly.
- * they are accessed by subsequent WHILEMs */
- ST.parenfloor = parenfloor;
- ST.me = scan;
- ST.B = next;
- ST.minmod = minmod;
- minmod = 0;
- ST.count = -1; /* this will be updated by WHILEM */
- ST.lastloc = NULL; /* this will be updated by WHILEM */
-
- PUSH_YES_STATE_GOTO(CURLYX_end, PREVOPER(next), locinput);
- assert(0); /* NOTREACHED */
- }
-
- case CURLYX_end: /* just finished matching all of A*B */
- cur_curlyx = ST.prev_curlyx;
- sayYES;
- assert(0); /* NOTREACHED */
-
- case CURLYX_end_fail: /* just failed to match all of A*B */
- regcpblow(ST.cp);
- cur_curlyx = ST.prev_curlyx;
- sayNO;
- assert(0); /* NOTREACHED */
-
-
-#undef ST
-#define ST st->u.whilem
-
- case WHILEM: /* just matched an A in /A*B/ (for complex A) */
- {
- /* see the discussion above about CURLYX/WHILEM */
- I32 n;
- int min = ARG1(cur_curlyx->u.curlyx.me);
- int max = ARG2(cur_curlyx->u.curlyx.me);
- regnode *A = NEXTOPER(cur_curlyx->u.curlyx.me) + EXTRA_STEP_2ARGS;
-
- assert(cur_curlyx); /* keep Coverity happy */
- n = ++cur_curlyx->u.curlyx.count; /* how many A's matched */
- ST.save_lastloc = cur_curlyx->u.curlyx.lastloc;
- ST.cache_offset = 0;
- ST.cache_mask = 0;
-
-
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- "%*s whilem: matched %ld out of %d..%d\n",
- REPORT_CODE_OFF+depth*2, "", (long)n, min, max)
- );
-
- /* First just match a string of min A's. */
-
- if (n < min) {
- ST.cp = regcppush(rex, cur_curlyx->u.curlyx.parenfloor,
- maxopenparen);
- cur_curlyx->u.curlyx.lastloc = locinput;
- REGCP_SET(ST.lastcp);
-
- PUSH_STATE_GOTO(WHILEM_A_pre, A, locinput);
- assert(0); /* NOTREACHED */
- }
-
- /* If degenerate A matches "", assume A done. */
-
- if (locinput == cur_curlyx->u.curlyx.lastloc) {
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- "%*s whilem: empty match detected, trying continuation...\n",
- REPORT_CODE_OFF+depth*2, "")
- );
- goto do_whilem_B_max;
- }
-
- /* super-linear cache processing.
- *
- * The idea here is that for certain types of CURLYX/WHILEM -
- * principally those whose upper bound is infinity (and
- * excluding regexes that have things like \1 and other very
- * non-regular expresssiony things), then if a pattern like
- * /....A*.../ fails and we backtrack to the WHILEM, then we
- * make a note that this particular WHILEM op was at string
- * position 47 (say) when the rest of pattern failed. Then, if
- * we ever find ourselves back at that WHILEM, and at string
- * position 47 again, we can just fail immediately rather than
- * running the rest of the pattern again.
- *
- * This is very handy when patterns start to go
- * 'super-linear', like in (a+)*(a+)*(a+)*, where you end up
- * with a combinatorial explosion of backtracking.
- *
- * The cache is implemented as a bit array, with one bit per
- * string byte position per WHILEM op (up to 16) - so its
- * between 0.25 and 2x the string size.
- *
- * To avoid allocating a poscache buffer every time, we do an
- * initially countdown; only after we have executed a WHILEM
- * op (string-length x #WHILEMs) times do we allocate the
- * cache.
- *
- * The top 4 bits of scan->flags byte say how many different
- * relevant CURLLYX/WHILEM op pairs there are, while the
- * bottom 4-bits is the identifying index number of this
- * WHILEM.
- */
-
- if (scan->flags) {
-
- if (!reginfo->poscache_maxiter) {
- /* start the countdown: Postpone detection until we
- * know the match is not *that* much linear. */
- reginfo->poscache_maxiter
- = (reginfo->strend - reginfo->strbeg + 1)
- * (scan->flags>>4);
- /* possible overflow for long strings and many CURLYX's */
- if (reginfo->poscache_maxiter < 0)
- reginfo->poscache_maxiter = I32_MAX;
- reginfo->poscache_iter = reginfo->poscache_maxiter;
- }
-
- if (reginfo->poscache_iter-- == 0) {
- /* initialise cache */
- const SSize_t size = (reginfo->poscache_maxiter + 7)/8;
- regmatch_info_aux *const aux = reginfo->info_aux;
- if (aux->poscache) {
- if ((SSize_t)reginfo->poscache_size < size) {
- Renew(aux->poscache, size, char);
- reginfo->poscache_size = size;
- }
- Zero(aux->poscache, size, char);
- }
- else {
- reginfo->poscache_size = size;
- Newxz(aux->poscache, size, char);
- }
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- "%swhilem: Detected a super-linear match, switching on caching%s...\n",
- PL_colors[4], PL_colors[5])
- );
- }
-
- if (reginfo->poscache_iter < 0) {
- /* have we already failed at this position? */
- SSize_t offset, mask;
-
- reginfo->poscache_iter = -1; /* stop eventual underflow */
- offset = (scan->flags & 0xf) - 1
- + (locinput - reginfo->strbeg)
- * (scan->flags>>4);
- mask = 1 << (offset % 8);
- offset /= 8;
- if (reginfo->info_aux->poscache[offset] & mask) {
- DEBUG_EXECUTE_r( PerlIO_printf(Perl_debug_log,
- "%*s whilem: (cache) already tried at this position...\n",
- REPORT_CODE_OFF+depth*2, "")
- );
- sayNO; /* cache records failure */
- }
- ST.cache_offset = offset;
- ST.cache_mask = mask;
- }
- }
-
- /* Prefer B over A for minimal matching. */
-
- if (cur_curlyx->u.curlyx.minmod) {
- ST.save_curlyx = cur_curlyx;
- cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx;
- ST.cp = regcppush(rex, ST.save_curlyx->u.curlyx.parenfloor,
- maxopenparen);
- REGCP_SET(ST.lastcp);
- PUSH_YES_STATE_GOTO(WHILEM_B_min, ST.save_curlyx->u.curlyx.B,
- locinput);
- assert(0); /* NOTREACHED */
- }
-
- /* Prefer A over B for maximal matching. */
-
- if (n < max) { /* More greed allowed? */
- ST.cp = regcppush(rex, cur_curlyx->u.curlyx.parenfloor,
- maxopenparen);
- cur_curlyx->u.curlyx.lastloc = locinput;
- REGCP_SET(ST.lastcp);
- PUSH_STATE_GOTO(WHILEM_A_max, A, locinput);
- assert(0); /* NOTREACHED */
- }
- goto do_whilem_B_max;
- }
- assert(0); /* NOTREACHED */
-
- case WHILEM_B_min: /* just matched B in a minimal match */
- case WHILEM_B_max: /* just matched B in a maximal match */
- cur_curlyx = ST.save_curlyx;
- sayYES;
- assert(0); /* NOTREACHED */
-
- case WHILEM_B_max_fail: /* just failed to match B in a maximal match */
- cur_curlyx = ST.save_curlyx;
- cur_curlyx->u.curlyx.lastloc = ST.save_lastloc;
- cur_curlyx->u.curlyx.count--;
- CACHEsayNO;
- assert(0); /* NOTREACHED */
-
- case WHILEM_A_min_fail: /* just failed to match A in a minimal match */
- /* FALLTHROUGH */
- case WHILEM_A_pre_fail: /* just failed to match even minimal A */
- REGCP_UNWIND(ST.lastcp);
- regcppop(rex, &maxopenparen);
- cur_curlyx->u.curlyx.lastloc = ST.save_lastloc;
- cur_curlyx->u.curlyx.count--;
- CACHEsayNO;
- assert(0); /* NOTREACHED */
-
- case WHILEM_A_max_fail: /* just failed to match A in a maximal match */
- REGCP_UNWIND(ST.lastcp);
- regcppop(rex, &maxopenparen); /* Restore some previous $<digit>s? */
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "%*s whilem: failed, trying continuation...\n",
- REPORT_CODE_OFF+depth*2, "")
- );
- do_whilem_B_max:
- if (cur_curlyx->u.curlyx.count >= REG_INFTY
- && ckWARN(WARN_REGEXP)
- && !reginfo->warned)
- {
- reginfo->warned = TRUE;
- Perl_warner(aTHX_ packWARN(WARN_REGEXP),
- "Complex regular subexpression recursion limit (%d) "
- "exceeded",
- REG_INFTY - 1);
- }
-
- /* now try B */
- ST.save_curlyx = cur_curlyx;
- cur_curlyx = cur_curlyx->u.curlyx.prev_curlyx;
- PUSH_YES_STATE_GOTO(WHILEM_B_max, ST.save_curlyx->u.curlyx.B,
- locinput);
- assert(0); /* NOTREACHED */
-
- case WHILEM_B_min_fail: /* just failed to match B in a minimal match */
- cur_curlyx = ST.save_curlyx;
- REGCP_UNWIND(ST.lastcp);
- regcppop(rex, &maxopenparen);
-
- if (cur_curlyx->u.curlyx.count >= /*max*/ARG2(cur_curlyx->u.curlyx.me)) {
- /* Maximum greed exceeded */
- if (cur_curlyx->u.curlyx.count >= REG_INFTY
- && ckWARN(WARN_REGEXP)
- && !reginfo->warned)
- {
- reginfo->warned = TRUE;
- Perl_warner(aTHX_ packWARN(WARN_REGEXP),
- "Complex regular subexpression recursion "
- "limit (%d) exceeded",
- REG_INFTY - 1);
- }
- cur_curlyx->u.curlyx.count--;
- CACHEsayNO;
- }
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "%*s trying longer...\n", REPORT_CODE_OFF+depth*2, "")
- );
- /* Try grabbing another A and see if it helps. */
- cur_curlyx->u.curlyx.lastloc = locinput;
- ST.cp = regcppush(rex, cur_curlyx->u.curlyx.parenfloor,
- maxopenparen);
- REGCP_SET(ST.lastcp);
- PUSH_STATE_GOTO(WHILEM_A_min,
- /*A*/ NEXTOPER(ST.save_curlyx->u.curlyx.me) + EXTRA_STEP_2ARGS,
- locinput);
- assert(0); /* NOTREACHED */
-
-#undef ST
-#define ST st->u.branch
-
- case BRANCHJ: /* /(...|A|...)/ with long next pointer */
- next = scan + ARG(scan);
- if (next == scan)
- next = NULL;
- scan = NEXTOPER(scan);
- /* FALLTHROUGH */
-
- case BRANCH: /* /(...|A|...)/ */
- scan = NEXTOPER(scan); /* scan now points to inner node */
- ST.lastparen = rex->lastparen;
- ST.lastcloseparen = rex->lastcloseparen;
- ST.next_branch = next;
- REGCP_SET(ST.cp);
-
- /* Now go into the branch */
- if (has_cutgroup) {
- PUSH_YES_STATE_GOTO(BRANCH_next, scan, locinput);
- } else {
- PUSH_STATE_GOTO(BRANCH_next, scan, locinput);
- }
- assert(0); /* NOTREACHED */
-
- case CUTGROUP: /* /(*THEN)/ */
- sv_yes_mark = st->u.mark.mark_name = scan->flags ? NULL :
- MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
- PUSH_STATE_GOTO(CUTGROUP_next, next, locinput);
- assert(0); /* NOTREACHED */
-
- case CUTGROUP_next_fail:
- do_cutgroup = 1;
- no_final = 1;
- if (st->u.mark.mark_name)
- sv_commit = st->u.mark.mark_name;
- sayNO;
- assert(0); /* NOTREACHED */
-
- case BRANCH_next:
- sayYES;
- assert(0); /* NOTREACHED */
-
- case BRANCH_next_fail: /* that branch failed; try the next, if any */
- if (do_cutgroup) {
- do_cutgroup = 0;
- no_final = 0;
- }
- REGCP_UNWIND(ST.cp);
- UNWIND_PAREN(ST.lastparen, ST.lastcloseparen);
- scan = ST.next_branch;
- /* no more branches? */
- if (!scan || (OP(scan) != BRANCH && OP(scan) != BRANCHJ)) {
- DEBUG_EXECUTE_r({
- PerlIO_printf( Perl_debug_log,
- "%*s %sBRANCH failed...%s\n",
- REPORT_CODE_OFF+depth*2, "",
- PL_colors[4],
- PL_colors[5] );
- });
- sayNO_SILENT;
- }
- continue; /* execute next BRANCH[J] op */
- assert(0); /* NOTREACHED */
-
- case MINMOD: /* next op will be non-greedy, e.g. A*? */
- minmod = 1;
- break;
-
-#undef ST
-#define ST st->u.curlym
-
- case CURLYM: /* /A{m,n}B/ where A is fixed-length */
-
- /* This is an optimisation of CURLYX that enables us to push
- * only a single backtracking state, no matter how many matches
- * there are in {m,n}. It relies on the pattern being constant
- * length, with no parens to influence future backrefs
- */
-
- ST.me = scan;
- scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
-
- ST.lastparen = rex->lastparen;
- ST.lastcloseparen = rex->lastcloseparen;
-
- /* if paren positive, emulate an OPEN/CLOSE around A */
- if (ST.me->flags) {
- U32 paren = ST.me->flags;
- if (paren > maxopenparen)
- maxopenparen = paren;
- scan += NEXT_OFF(scan); /* Skip former OPEN. */
- }
- ST.A = scan;
- ST.B = next;
- ST.alen = 0;
- ST.count = 0;
- ST.minmod = minmod;
- minmod = 0;
- ST.c1 = CHRTEST_UNINIT;
- REGCP_SET(ST.cp);
-
- if (!(ST.minmod ? ARG1(ST.me) : ARG2(ST.me))) /* min/max */
- goto curlym_do_B;
-
- curlym_do_A: /* execute the A in /A{m,n}B/ */
- PUSH_YES_STATE_GOTO(CURLYM_A, ST.A, locinput); /* match A */
- assert(0); /* NOTREACHED */
-
- case CURLYM_A: /* we've just matched an A */
- ST.count++;
- /* after first match, determine A's length: u.curlym.alen */
- if (ST.count == 1) {
- if (reginfo->is_utf8_target) {
- char *s = st->locinput;
- while (s < locinput) {
- ST.alen++;
- s += UTF8SKIP(s);
- }
- }
- else {
- ST.alen = locinput - st->locinput;
- }
- if (ST.alen == 0)
- ST.count = ST.minmod ? ARG1(ST.me) : ARG2(ST.me);
- }
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s CURLYM now matched %"IVdf" times, len=%"IVdf"...\n",
- (int)(REPORT_CODE_OFF+(depth*2)), "",
- (IV) ST.count, (IV)ST.alen)
- );
-
- if (cur_eval && cur_eval->u.eval.close_paren &&
- cur_eval->u.eval.close_paren == (U32)ST.me->flags)
- goto fake_end;
-
- {
- I32 max = (ST.minmod ? ARG1(ST.me) : ARG2(ST.me));
- if ( max == REG_INFTY || ST.count < max )
- goto curlym_do_A; /* try to match another A */
- }
- goto curlym_do_B; /* try to match B */
-
- case CURLYM_A_fail: /* just failed to match an A */
- REGCP_UNWIND(ST.cp);
-
- if (ST.minmod || ST.count < ARG1(ST.me) /* min*/
- || (cur_eval && cur_eval->u.eval.close_paren &&
- cur_eval->u.eval.close_paren == (U32)ST.me->flags))
- sayNO;
-
- curlym_do_B: /* execute the B in /A{m,n}B/ */
- if (ST.c1 == CHRTEST_UNINIT) {
- /* calculate c1 and c2 for possible match of 1st char
- * following curly */
- ST.c1 = ST.c2 = CHRTEST_VOID;
- if (HAS_TEXT(ST.B) || JUMPABLE(ST.B)) {
- regnode *text_node = ST.B;
- if (! HAS_TEXT(text_node))
- FIND_NEXT_IMPT(text_node);
- /* this used to be
-
- (HAS_TEXT(text_node) && PL_regkind[OP(text_node)] == EXACT)
-
- But the former is redundant in light of the latter.
-
- if this changes back then the macro for
- IS_TEXT and friends need to change.
- */
- if (PL_regkind[OP(text_node)] == EXACT) {
- if (! S_setup_EXACTISH_ST_c1_c2(aTHX_
- text_node, &ST.c1, ST.c1_utf8, &ST.c2, ST.c2_utf8,
- reginfo))
- {
- sayNO;
- }
- }
- }
- }
-
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s CURLYM trying tail with matches=%"IVdf"...\n",
- (int)(REPORT_CODE_OFF+(depth*2)),
- "", (IV)ST.count)
- );
- if (! NEXTCHR_IS_EOS && ST.c1 != CHRTEST_VOID) {
- if (! UTF8_IS_INVARIANT(nextchr) && utf8_target) {
- if (memNE(locinput, ST.c1_utf8, UTF8SKIP(locinput))
- && memNE(locinput, ST.c2_utf8, UTF8SKIP(locinput)))
- {
- /* simulate B failing */
- DEBUG_OPTIMISE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s CURLYM Fast bail next target=0x%"UVXf" c1=0x%"UVXf" c2=0x%"UVXf"\n",
- (int)(REPORT_CODE_OFF+(depth*2)),"",
- valid_utf8_to_uvchr((U8 *) locinput, NULL),
- valid_utf8_to_uvchr(ST.c1_utf8, NULL),
- valid_utf8_to_uvchr(ST.c2_utf8, NULL))
- );
- state_num = CURLYM_B_fail;
- goto reenter_switch;
- }
- }
- else if (nextchr != ST.c1 && nextchr != ST.c2) {
- /* simulate B failing */
- DEBUG_OPTIMISE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s CURLYM Fast bail next target=0x%X c1=0x%X c2=0x%X\n",
- (int)(REPORT_CODE_OFF+(depth*2)),"",
- (int) nextchr, ST.c1, ST.c2)
- );
- state_num = CURLYM_B_fail;
- goto reenter_switch;
- }
- }
-
- if (ST.me->flags) {
- /* emulate CLOSE: mark current A as captured */
- I32 paren = ST.me->flags;
- if (ST.count) {
- rex->offs[paren].start
- = HOPc(locinput, -ST.alen) - reginfo->strbeg;
- rex->offs[paren].end = locinput - reginfo->strbeg;
- if ((U32)paren > rex->lastparen)
- rex->lastparen = paren;
- rex->lastcloseparen = paren;
- }
- else
- rex->offs[paren].end = -1;
- if (cur_eval && cur_eval->u.eval.close_paren &&
- cur_eval->u.eval.close_paren == (U32)ST.me->flags)
- {
- if (ST.count)
- goto fake_end;
- else
- sayNO;
- }
- }
-
- PUSH_STATE_GOTO(CURLYM_B, ST.B, locinput); /* match B */
- assert(0); /* NOTREACHED */
-
- case CURLYM_B_fail: /* just failed to match a B */
- REGCP_UNWIND(ST.cp);
- UNWIND_PAREN(ST.lastparen, ST.lastcloseparen);
- if (ST.minmod) {
- I32 max = ARG2(ST.me);
- if (max != REG_INFTY && ST.count == max)
- sayNO;
- goto curlym_do_A; /* try to match a further A */
- }
- /* backtrack one A */
- if (ST.count == ARG1(ST.me) /* min */)
- sayNO;
- ST.count--;
- SET_locinput(HOPc(locinput, -ST.alen));
- goto curlym_do_B; /* try to match B */
-
-#undef ST
-#define ST st->u.curly
-
-#define CURLY_SETPAREN(paren, success) \
- if (paren) { \
- if (success) { \
- rex->offs[paren].start = HOPc(locinput, -1) - reginfo->strbeg; \
- rex->offs[paren].end = locinput - reginfo->strbeg; \
- if (paren > rex->lastparen) \
- rex->lastparen = paren; \
- rex->lastcloseparen = paren; \
- } \
- else { \
- rex->offs[paren].end = -1; \
- rex->lastparen = ST.lastparen; \
- rex->lastcloseparen = ST.lastcloseparen; \
- } \
- }
-
- case STAR: /* /A*B/ where A is width 1 char */
- ST.paren = 0;
- ST.min = 0;
- ST.max = REG_INFTY;
- scan = NEXTOPER(scan);
- goto repeat;
-
- case PLUS: /* /A+B/ where A is width 1 char */
- ST.paren = 0;
- ST.min = 1;
- ST.max = REG_INFTY;
- scan = NEXTOPER(scan);
- goto repeat;
-
- case CURLYN: /* /(A){m,n}B/ where A is width 1 char */
- ST.paren = scan->flags; /* Which paren to set */
- ST.lastparen = rex->lastparen;
- ST.lastcloseparen = rex->lastcloseparen;
- if (ST.paren > maxopenparen)
- maxopenparen = ST.paren;
- ST.min = ARG1(scan); /* min to match */
- ST.max = ARG2(scan); /* max to match */
- if (cur_eval && cur_eval->u.eval.close_paren &&
- cur_eval->u.eval.close_paren == (U32)ST.paren) {
- ST.min=1;
- ST.max=1;
- }
- scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE);
- goto repeat;
-
- case CURLY: /* /A{m,n}B/ where A is width 1 char */
- ST.paren = 0;
- ST.min = ARG1(scan); /* min to match */
- ST.max = ARG2(scan); /* max to match */
- scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
- repeat:
- /*
- * Lookahead to avoid useless match attempts
- * when we know what character comes next.
- *
- * Used to only do .*x and .*?x, but now it allows
- * for )'s, ('s and (?{ ... })'s to be in the way
- * of the quantifier and the EXACT-like node. -- japhy
- */
-
- assert(ST.min <= ST.max);
- if (! HAS_TEXT(next) && ! JUMPABLE(next)) {
- ST.c1 = ST.c2 = CHRTEST_VOID;
- }
- else {
- regnode *text_node = next;
-
- if (! HAS_TEXT(text_node))
- FIND_NEXT_IMPT(text_node);
-
- if (! HAS_TEXT(text_node))
- ST.c1 = ST.c2 = CHRTEST_VOID;
- else {
- if ( PL_regkind[OP(text_node)] != EXACT ) {
- ST.c1 = ST.c2 = CHRTEST_VOID;
- }
- else {
-
- /* Currently we only get here when
-
- PL_rekind[OP(text_node)] == EXACT
-
- if this changes back then the macro for IS_TEXT and
- friends need to change. */
- if (! S_setup_EXACTISH_ST_c1_c2(aTHX_
- text_node, &ST.c1, ST.c1_utf8, &ST.c2, ST.c2_utf8,
- reginfo))
- {
- sayNO;
- }
- }
- }
- }
-
- ST.A = scan;
- ST.B = next;
- if (minmod) {
- char *li = locinput;
- minmod = 0;
- if (ST.min &&
- regrepeat(rex, &li, ST.A, reginfo, ST.min, depth)
- < ST.min)
- sayNO;
- SET_locinput(li);
- ST.count = ST.min;
- REGCP_SET(ST.cp);
- if (ST.c1 == CHRTEST_VOID)
- goto curly_try_B_min;
-
- ST.oldloc = locinput;
-
- /* set ST.maxpos to the furthest point along the
- * string that could possibly match */
- if (ST.max == REG_INFTY) {
- ST.maxpos = reginfo->strend - 1;
- if (utf8_target)
- while (UTF8_IS_CONTINUATION(*(U8*)ST.maxpos))
- ST.maxpos--;
- }
- else if (utf8_target) {
- int m = ST.max - ST.min;
- for (ST.maxpos = locinput;
- m >0 && ST.maxpos < reginfo->strend; m--)
- ST.maxpos += UTF8SKIP(ST.maxpos);
- }
- else {
- ST.maxpos = locinput + ST.max - ST.min;
- if (ST.maxpos >= reginfo->strend)
- ST.maxpos = reginfo->strend - 1;
- }
- goto curly_try_B_min_known;
-
- }
- else {
- /* avoid taking address of locinput, so it can remain
- * a register var */
- char *li = locinput;
- ST.count = regrepeat(rex, &li, ST.A, reginfo, ST.max, depth);
- if (ST.count < ST.min)
- sayNO;
- SET_locinput(li);
- if ((ST.count > ST.min)
- && (PL_regkind[OP(ST.B)] == EOL) && (OP(ST.B) != MEOL))
- {
- /* A{m,n} must come at the end of the string, there's
- * no point in backing off ... */
- ST.min = ST.count;
- /* ...except that $ and \Z can match before *and* after
- newline at the end. Consider "\n\n" =~ /\n+\Z\n/.
- We may back off by one in this case. */
- if (UCHARAT(locinput - 1) == '\n' && OP(ST.B) != EOS)
- ST.min--;
- }
- REGCP_SET(ST.cp);
- goto curly_try_B_max;
- }
- assert(0); /* NOTREACHED */
-
-
- case CURLY_B_min_known_fail:
- /* failed to find B in a non-greedy match where c1,c2 valid */
-
- REGCP_UNWIND(ST.cp);
- if (ST.paren) {
- UNWIND_PAREN(ST.lastparen, ST.lastcloseparen);
- }
- /* Couldn't or didn't -- move forward. */
- ST.oldloc = locinput;
- if (utf8_target)
- locinput += UTF8SKIP(locinput);
- else
- locinput++;
- ST.count++;
- curly_try_B_min_known:
- /* find the next place where 'B' could work, then call B */
- {
- int n;
- if (utf8_target) {
- n = (ST.oldloc == locinput) ? 0 : 1;
- if (ST.c1 == ST.c2) {
- /* set n to utf8_distance(oldloc, locinput) */
- while (locinput <= ST.maxpos
- && memNE(locinput, ST.c1_utf8, UTF8SKIP(locinput)))
- {
- locinput += UTF8SKIP(locinput);
- n++;
- }
- }
- else {
- /* set n to utf8_distance(oldloc, locinput) */
- while (locinput <= ST.maxpos
- && memNE(locinput, ST.c1_utf8, UTF8SKIP(locinput))
- && memNE(locinput, ST.c2_utf8, UTF8SKIP(locinput)))
- {
- locinput += UTF8SKIP(locinput);
- n++;
- }
- }
- }
- else { /* Not utf8_target */
- if (ST.c1 == ST.c2) {
- while (locinput <= ST.maxpos &&
- UCHARAT(locinput) != ST.c1)
- locinput++;
- }
- else {
- while (locinput <= ST.maxpos
- && UCHARAT(locinput) != ST.c1
- && UCHARAT(locinput) != ST.c2)
- locinput++;
- }
- n = locinput - ST.oldloc;
- }
- if (locinput > ST.maxpos)
- sayNO;
- if (n) {
- /* In /a{m,n}b/, ST.oldloc is at "a" x m, locinput is
- * at b; check that everything between oldloc and
- * locinput matches */
- char *li = ST.oldloc;
- ST.count += n;
- if (regrepeat(rex, &li, ST.A, reginfo, n, depth) < n)
- sayNO;
- assert(n == REG_INFTY || locinput == li);
- }
- CURLY_SETPAREN(ST.paren, ST.count);
- if (cur_eval && cur_eval->u.eval.close_paren &&
- cur_eval->u.eval.close_paren == (U32)ST.paren) {
- goto fake_end;
- }
- PUSH_STATE_GOTO(CURLY_B_min_known, ST.B, locinput);
- }
- assert(0); /* NOTREACHED */
-
-
- case CURLY_B_min_fail:
- /* failed to find B in a non-greedy match where c1,c2 invalid */
-
- REGCP_UNWIND(ST.cp);
- if (ST.paren) {
- UNWIND_PAREN(ST.lastparen, ST.lastcloseparen);
- }
- /* failed -- move forward one */
- {
- char *li = locinput;
- if (!regrepeat(rex, &li, ST.A, reginfo, 1, depth)) {
- sayNO;
- }
- locinput = li;
- }
- {
- ST.count++;
- if (ST.count <= ST.max || (ST.max == REG_INFTY &&
- ST.count > 0)) /* count overflow ? */
- {
- curly_try_B_min:
- CURLY_SETPAREN(ST.paren, ST.count);
- if (cur_eval && cur_eval->u.eval.close_paren &&
- cur_eval->u.eval.close_paren == (U32)ST.paren) {
- goto fake_end;
- }
- PUSH_STATE_GOTO(CURLY_B_min, ST.B, locinput);
- }
- }
- sayNO;
- assert(0); /* NOTREACHED */
-
-
- curly_try_B_max:
- /* a successful greedy match: now try to match B */
- if (cur_eval && cur_eval->u.eval.close_paren &&
- cur_eval->u.eval.close_paren == (U32)ST.paren) {
- goto fake_end;
- }
- {
- bool could_match = locinput < reginfo->strend;
-
- /* If it could work, try it. */
- if (ST.c1 != CHRTEST_VOID && could_match) {
- if (! UTF8_IS_INVARIANT(UCHARAT(locinput)) && utf8_target)
- {
- could_match = memEQ(locinput,
- ST.c1_utf8,
- UTF8SKIP(locinput))
- || memEQ(locinput,
- ST.c2_utf8,
- UTF8SKIP(locinput));
- }
- else {
- could_match = UCHARAT(locinput) == ST.c1
- || UCHARAT(locinput) == ST.c2;
- }
- }
- if (ST.c1 == CHRTEST_VOID || could_match) {
- CURLY_SETPAREN(ST.paren, ST.count);
- PUSH_STATE_GOTO(CURLY_B_max, ST.B, locinput);
- assert(0); /* NOTREACHED */
- }
- }
- /* FALLTHROUGH */
-
- case CURLY_B_max_fail:
- /* failed to find B in a greedy match */
-
- REGCP_UNWIND(ST.cp);
- if (ST.paren) {
- UNWIND_PAREN(ST.lastparen, ST.lastcloseparen);
- }
- /* back up. */
- if (--ST.count < ST.min)
- sayNO;
- locinput = HOPc(locinput, -1);
- goto curly_try_B_max;
-
-#undef ST
-
- case END: /* last op of main pattern */
- fake_end:
- if (cur_eval) {
- /* we've just finished A in /(??{A})B/; now continue with B */
-
- st->u.eval.prev_rex = rex_sv; /* inner */
-
- /* Save *all* the positions. */
- st->u.eval.cp = regcppush(rex, 0, maxopenparen);
- rex_sv = cur_eval->u.eval.prev_rex;
- is_utf8_pat = reginfo->is_utf8_pat = cBOOL(RX_UTF8(rex_sv));
- SET_reg_curpm(rex_sv);
- rex = ReANY(rex_sv);
- rexi = RXi_GET(rex);
- cur_curlyx = cur_eval->u.eval.prev_curlyx;
-
- REGCP_SET(st->u.eval.lastcp);
-
- /* Restore parens of the outer rex without popping the
- * savestack */
- S_regcp_restore(aTHX_ rex, cur_eval->u.eval.lastcp,
- &maxopenparen);
-
- st->u.eval.prev_eval = cur_eval;
- cur_eval = cur_eval->u.eval.prev_eval;
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log, "%*s EVAL trying tail ... %"UVxf"\n",
- REPORT_CODE_OFF+depth*2, "",PTR2UV(cur_eval)););
- if ( nochange_depth )
- nochange_depth--;
-
- PUSH_YES_STATE_GOTO(EVAL_AB, st->u.eval.prev_eval->u.eval.B,
- locinput); /* match B */
- }
-
- if (locinput < reginfo->till) {
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
- "%sMatch possible, but length=%ld is smaller than requested=%ld, failing!%s\n",
- PL_colors[4],
- (long)(locinput - startpos),
- (long)(reginfo->till - startpos),
- PL_colors[5]));
-
- sayNO_SILENT; /* Cannot match: too short. */
- }
- sayYES; /* Success! */
-
- case SUCCEED: /* successful SUSPEND/UNLESSM/IFMATCH/CURLYM */
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s %ssubpattern success...%s\n",
- REPORT_CODE_OFF+depth*2, "", PL_colors[4], PL_colors[5]));
- sayYES; /* Success! */
-
-#undef ST
-#define ST st->u.ifmatch
-
- {
- char *newstart;
-
- case SUSPEND: /* (?>A) */
- ST.wanted = 1;
- newstart = locinput;
- goto do_ifmatch;
-
- case UNLESSM: /* -ve lookaround: (?!A), or with flags, (?<!A) */
- ST.wanted = 0;
- goto ifmatch_trivial_fail_test;
-
- case IFMATCH: /* +ve lookaround: (?=A), or with flags, (?<=A) */
- ST.wanted = 1;
- ifmatch_trivial_fail_test:
- if (scan->flags) {
- char * const s = HOPBACKc(locinput, scan->flags);
- if (!s) {
- /* trivial fail */
- if (logical) {
- logical = 0;
- sw = 1 - cBOOL(ST.wanted);
- }
- else if (ST.wanted)
- sayNO;
- next = scan + ARG(scan);
- if (next == scan)
- next = NULL;
- break;
- }
- newstart = s;
- }
- else
- newstart = locinput;
-
- do_ifmatch:
- ST.me = scan;
- ST.logical = logical;
- logical = 0; /* XXX: reset state of logical once it has been saved into ST */
-
- /* execute body of (?...A) */
- PUSH_YES_STATE_GOTO(IFMATCH_A, NEXTOPER(NEXTOPER(scan)), newstart);
- assert(0); /* NOTREACHED */
- }
-
- case IFMATCH_A_fail: /* body of (?...A) failed */
- ST.wanted = !ST.wanted;
- /* FALLTHROUGH */
-
- case IFMATCH_A: /* body of (?...A) succeeded */
- if (ST.logical) {
- sw = cBOOL(ST.wanted);
- }
- else if (!ST.wanted)
- sayNO;
-
- if (OP(ST.me) != SUSPEND) {
- /* restore old position except for (?>...) */
- locinput = st->locinput;
- }
- scan = ST.me + ARG(ST.me);
- if (scan == ST.me)
- scan = NULL;
- continue; /* execute B */
-
-#undef ST
-
- case LONGJMP: /* alternative with many branches compiles to
- * (BRANCHJ; EXACT ...; LONGJMP ) x N */
- next = scan + ARG(scan);
- if (next == scan)
- next = NULL;
- break;
-
- case COMMIT: /* (*COMMIT) */
- reginfo->cutpoint = reginfo->strend;
- /* FALLTHROUGH */
-
- case PRUNE: /* (*PRUNE) */
- if (!scan->flags)
- sv_yes_mark = sv_commit = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
- PUSH_STATE_GOTO(COMMIT_next, next, locinput);
- assert(0); /* NOTREACHED */
-
- case COMMIT_next_fail:
- no_final = 1;
- /* FALLTHROUGH */
-
- case OPFAIL: /* (*FAIL) */
- sayNO;
- assert(0); /* NOTREACHED */
-
-#define ST st->u.mark
- case MARKPOINT: /* (*MARK:foo) */
- ST.prev_mark = mark_state;
- ST.mark_name = sv_commit = sv_yes_mark
- = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
- mark_state = st;
- ST.mark_loc = locinput;
- PUSH_YES_STATE_GOTO(MARKPOINT_next, next, locinput);
- assert(0); /* NOTREACHED */
-
- case MARKPOINT_next:
- mark_state = ST.prev_mark;
- sayYES;
- assert(0); /* NOTREACHED */
-
- case MARKPOINT_next_fail:
- if (popmark && sv_eq(ST.mark_name,popmark))
- {
- if (ST.mark_loc > startpoint)
- reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1);
- popmark = NULL; /* we found our mark */
- sv_commit = ST.mark_name;
-
- DEBUG_EXECUTE_r({
- PerlIO_printf(Perl_debug_log,
- "%*s %ssetting cutpoint to mark:%"SVf"...%s\n",
- REPORT_CODE_OFF+depth*2, "",
- PL_colors[4], SVfARG(sv_commit), PL_colors[5]);
- });
- }
- mark_state = ST.prev_mark;
- sv_yes_mark = mark_state ?
- mark_state->u.mark.mark_name : NULL;
- sayNO;
- assert(0); /* NOTREACHED */
-
- case SKIP: /* (*SKIP) */
- if (scan->flags) {
- /* (*SKIP) : if we fail we cut here*/
- ST.mark_name = NULL;
- ST.mark_loc = locinput;
- PUSH_STATE_GOTO(SKIP_next,next, locinput);
- } else {
- /* (*SKIP:NAME) : if there is a (*MARK:NAME) fail where it was,
- otherwise do nothing. Meaning we need to scan
- */
- regmatch_state *cur = mark_state;
- SV *find = MUTABLE_SV(rexi->data->data[ ARG( scan ) ]);
-
- while (cur) {
- if ( sv_eq( cur->u.mark.mark_name,
- find ) )
- {
- ST.mark_name = find;
- PUSH_STATE_GOTO( SKIP_next, next, locinput);
- }
- cur = cur->u.mark.prev_mark;
- }
- }
- /* Didn't find our (*MARK:NAME) so ignore this (*SKIP:NAME) */
- break;
-
- case SKIP_next_fail:
- if (ST.mark_name) {
- /* (*CUT:NAME) - Set up to search for the name as we
- collapse the stack*/
- popmark = ST.mark_name;
- } else {
- /* (*CUT) - No name, we cut here.*/
- if (ST.mark_loc > startpoint)
- reginfo->cutpoint = HOPBACKc(ST.mark_loc, 1);
- /* but we set sv_commit to latest mark_name if there
- is one so they can test to see how things lead to this
- cut */
- if (mark_state)
- sv_commit=mark_state->u.mark.mark_name;
- }
- no_final = 1;
- sayNO;
- assert(0); /* NOTREACHED */
-#undef ST
-
- case LNBREAK: /* \R */
- if ((n=is_LNBREAK_safe(locinput, reginfo->strend, utf8_target))) {
- locinput += n;
- } else
- sayNO;
- break;
-
- default:
- PerlIO_printf(Perl_error_log, "%"UVxf" %d\n",
- PTR2UV(scan), OP(scan));
- Perl_croak(aTHX_ "regexp memory corruption");
-
- /* this is a point to jump to in order to increment
- * locinput by one character */
- increment_locinput:
- assert(!NEXTCHR_IS_EOS);
- if (utf8_target) {
- locinput += PL_utf8skip[nextchr];
- /* locinput is allowed to go 1 char off the end, but not 2+ */
- if (locinput > reginfo->strend)
- sayNO;
- }
- else
- locinput++;
- break;
-
- } /* end switch */
-
- /* switch break jumps here */
- scan = next; /* prepare to execute the next op and ... */
- continue; /* ... jump back to the top, reusing st */
- assert(0); /* NOTREACHED */
-
- push_yes_state:
- /* push a state that backtracks on success */
- st->u.yes.prev_yes_state = yes_state;
- yes_state = st;
- /* FALLTHROUGH */
- push_state:
- /* push a new regex state, then continue at scan */
- {
- regmatch_state *newst;
-
- DEBUG_STACK_r({
- regmatch_state *cur = st;
- regmatch_state *curyes = yes_state;
- int curd = depth;
- regmatch_slab *slab = PL_regmatch_slab;
- for (;curd > -1;cur--,curd--) {
- if (cur < SLAB_FIRST(slab)) {
- slab = slab->prev;
- cur = SLAB_LAST(slab);
- }
- PerlIO_printf(Perl_error_log, "%*s#%-3d %-10s %s\n",
- REPORT_CODE_OFF + 2 + depth * 2,"",
- curd, PL_reg_name[cur->resume_state],
- (curyes == cur) ? "yes" : ""
- );
- if (curyes == cur)
- curyes = cur->u.yes.prev_yes_state;
- }
- } else
- DEBUG_STATE_pp("push")
- );
- depth++;
- st->locinput = locinput;
- newst = st+1;
- if (newst > SLAB_LAST(PL_regmatch_slab))
- newst = S_push_slab(aTHX);
- PL_regmatch_state = newst;
-
- locinput = pushinput;
- st = newst;
- continue;
- assert(0); /* NOTREACHED */
- }
- }
-
- /*
- * We get here only if there's trouble -- normally "case END" is
- * the terminating point.
- */
- Perl_croak(aTHX_ "corrupted regexp pointers");
- /*NOTREACHED*/
- sayNO;
-
-yes:
- if (yes_state) {
- /* we have successfully completed a subexpression, but we must now
- * pop to the state marked by yes_state and continue from there */
- assert(st != yes_state);
-#ifdef DEBUGGING
- while (st != yes_state) {
- st--;
- if (st < SLAB_FIRST(PL_regmatch_slab)) {
- PL_regmatch_slab = PL_regmatch_slab->prev;
- st = SLAB_LAST(PL_regmatch_slab);
- }
- DEBUG_STATE_r({
- if (no_final) {
- DEBUG_STATE_pp("pop (no final)");
- } else {
- DEBUG_STATE_pp("pop (yes)");
- }
- });
- depth--;
- }
-#else
- while (yes_state < SLAB_FIRST(PL_regmatch_slab)
- || yes_state > SLAB_LAST(PL_regmatch_slab))
- {
- /* not in this slab, pop slab */
- depth -= (st - SLAB_FIRST(PL_regmatch_slab) + 1);
- PL_regmatch_slab = PL_regmatch_slab->prev;
- st = SLAB_LAST(PL_regmatch_slab);
- }
- depth -= (st - yes_state);
-#endif
- st = yes_state;
- yes_state = st->u.yes.prev_yes_state;
- PL_regmatch_state = st;
-
- if (no_final)
- locinput= st->locinput;
- state_num = st->resume_state + no_final;
- goto reenter_switch;
- }
-
- DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%sMatch successful!%s\n",
- PL_colors[4], PL_colors[5]));
-
- if (reginfo->info_aux_eval) {
- /* each successfully executed (?{...}) block does the equivalent of
- * local $^R = do {...}
- * When popping the save stack, all these locals would be undone;
- * bypass this by setting the outermost saved $^R to the latest
- * value */
- /* I dont know if this is needed or works properly now.
- * see code related to PL_replgv elsewhere in this file.
- * Yves
- */
- if (oreplsv != GvSV(PL_replgv))
- sv_setsv(oreplsv, GvSV(PL_replgv));
- }
- result = 1;
- goto final_exit;
-
-no:
- DEBUG_EXECUTE_r(
- PerlIO_printf(Perl_debug_log,
- "%*s %sfailed...%s\n",
- REPORT_CODE_OFF+depth*2, "",
- PL_colors[4], PL_colors[5])
- );
-
-no_silent:
- if (no_final) {
- if (yes_state) {
- goto yes;
- } else {
- goto final_exit;
- }
- }
- if (depth) {
- /* there's a previous state to backtrack to */
- st--;
- if (st < SLAB_FIRST(PL_regmatch_slab)) {
- PL_regmatch_slab = PL_regmatch_slab->prev;
- st = SLAB_LAST(PL_regmatch_slab);
- }
- PL_regmatch_state = st;
- locinput= st->locinput;
-
- DEBUG_STATE_pp("pop");
- depth--;
- if (yes_state == st)
- yes_state = st->u.yes.prev_yes_state;
-
- state_num = st->resume_state + 1; /* failure = success + 1 */
- goto reenter_switch;
- }
- result = 0;
-
- final_exit:
- if (rex->intflags & PREGf_VERBARG_SEEN) {
- SV *sv_err = get_sv("REGERROR", 1);
- SV *sv_mrk = get_sv("REGMARK", 1);
- if (result) {
- sv_commit = &PL_sv_no;
- if (!sv_yes_mark)
- sv_yes_mark = &PL_sv_yes;
- } else {
- if (!sv_commit)
- sv_commit = &PL_sv_yes;
- sv_yes_mark = &PL_sv_no;
- }
- assert(sv_err);
- assert(sv_mrk);
- sv_setsv(sv_err, sv_commit);
- sv_setsv(sv_mrk, sv_yes_mark);
- }
-
-
- if (last_pushed_cv) {
- dSP;
- POP_MULTICALL;
- PERL_UNUSED_VAR(SP);
- }
-
- assert(!result || locinput - reginfo->strbeg >= 0);
- return result ? locinput - reginfo->strbeg : -1;
-}
-
-/*
- - regrepeat - repeatedly match something simple, report how many
- *
- * What 'simple' means is a node which can be the operand of a quantifier like
- * '+', or {1,3}
- *
- * startposp - pointer a pointer to the start position. This is updated
- * to point to the byte following the highest successful
- * match.
- * p - the regnode to be repeatedly matched against.
- * reginfo - struct holding match state, such as strend
- * max - maximum number of things to match.
- * depth - (for debugging) backtracking depth.
- */
-STATIC I32
-S_regrepeat(pTHX_ regexp *prog, char **startposp, const regnode *p,
- regmatch_info *const reginfo, I32 max, int depth)
-{
- dVAR;
- char *scan; /* Pointer to current position in target string */
- I32 c;
- char *loceol = reginfo->strend; /* local version */
- I32 hardcount = 0; /* How many matches so far */
- bool utf8_target = reginfo->is_utf8_target;
- int to_complement = 0; /* Invert the result? */
- UV utf8_flags;
- _char_class_number classnum;
-#ifndef DEBUGGING
- PERL_UNUSED_ARG(depth);
-#endif
-
- PERL_ARGS_ASSERT_REGREPEAT;
-
- scan = *startposp;
- if (max == REG_INFTY)
- max = I32_MAX;
- else if (! utf8_target && loceol - scan > max)
- loceol = scan + max;
-
- /* Here, for the case of a non-UTF-8 target we have adjusted <loceol> down
- * to the maximum of how far we should go in it (leaving it set to the real
- * end, if the maximum permissible would take us beyond that). This allows
- * us to make the loop exit condition that we haven't gone past <loceol> to
- * also mean that we haven't exceeded the max permissible count, saving a
- * test each time through the loop. But it assumes that the OP matches a
- * single byte, which is true for most of the OPs below when applied to a
- * non-UTF-8 target. Those relatively few OPs that don't have this
- * characteristic will have to compensate.
- *
- * There is no adjustment for UTF-8 targets, as the number of bytes per
- * character varies. OPs will have to test both that the count is less
- * than the max permissible (using <hardcount> to keep track), and that we
- * are still within the bounds of the string (using <loceol>. A few OPs
- * match a single byte no matter what the encoding. They can omit the max
- * test if, for the UTF-8 case, they do the adjustment that was skipped
- * above.
- *
- * Thus, the code above sets things up for the common case; and exceptional
- * cases need extra work; the common case is to make sure <scan> doesn't
- * go past <loceol>, and for UTF-8 to also use <hardcount> to make sure the
- * count doesn't exceed the maximum permissible */
-
- switch (OP(p)) {
- case REG_ANY:
- if (utf8_target) {
- while (scan < loceol && hardcount < max && *scan != '\n') {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- } else {
- while (scan < loceol && *scan != '\n')
- scan++;
- }
- break;
- case SANY:
- if (utf8_target) {
- while (scan < loceol && hardcount < max) {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- }
- else
- scan = loceol;
- break;
- case CANY: /* Move <scan> forward <max> bytes, unless goes off end */
- if (utf8_target && loceol - scan > max) {
-
- /* <loceol> hadn't been adjusted in the UTF-8 case */
- scan += max;
- }
- else {
- scan = loceol;
- }
- break;
- case EXACT:
- assert(STR_LEN(p) == reginfo->is_utf8_pat ? UTF8SKIP(STRING(p)) : 1);
-
- c = (U8)*STRING(p);
-
- /* Can use a simple loop if the pattern char to match on is invariant
- * under UTF-8, or both target and pattern aren't UTF-8. Note that we
- * can use UTF8_IS_INVARIANT() even if the pattern isn't UTF-8, as it's
- * true iff it doesn't matter if the argument is in UTF-8 or not */
- if (UTF8_IS_INVARIANT(c) || (! utf8_target && ! reginfo->is_utf8_pat)) {
- if (utf8_target && loceol - scan > max) {
- /* We didn't adjust <loceol> because is UTF-8, but ok to do so,
- * since here, to match at all, 1 char == 1 byte */
- loceol = scan + max;
- }
- while (scan < loceol && UCHARAT(scan) == c) {
- scan++;
- }
- }
- else if (reginfo->is_utf8_pat) {
- if (utf8_target) {
- STRLEN scan_char_len;
-
- /* When both target and pattern are UTF-8, we have to do
- * string EQ */
- while (hardcount < max
- && scan < loceol
- && (scan_char_len = UTF8SKIP(scan)) <= STR_LEN(p)
- && memEQ(scan, STRING(p), scan_char_len))
- {
- scan += scan_char_len;
- hardcount++;
- }
- }
- else if (! UTF8_IS_ABOVE_LATIN1(c)) {
-
- /* Target isn't utf8; convert the character in the UTF-8
- * pattern to non-UTF8, and do a simple loop */
- c = TWO_BYTE_UTF8_TO_NATIVE(c, *(STRING(p) + 1));
- while (scan < loceol && UCHARAT(scan) == c) {
- scan++;
- }
- } /* else pattern char is above Latin1, can't possibly match the
- non-UTF-8 target */
- }
- else {
-
- /* Here, the string must be utf8; pattern isn't, and <c> is
- * different in utf8 than not, so can't compare them directly.
- * Outside the loop, find the two utf8 bytes that represent c, and
- * then look for those in sequence in the utf8 string */
- U8 high = UTF8_TWO_BYTE_HI(c);
- U8 low = UTF8_TWO_BYTE_LO(c);
-
- while (hardcount < max
- && scan + 1 < loceol
- && UCHARAT(scan) == high
- && UCHARAT(scan + 1) == low)
- {
- scan += 2;
- hardcount++;
- }
- }
- break;
-
- case EXACTFA_NO_TRIE: /* This node only generated for non-utf8 patterns */
- assert(! reginfo->is_utf8_pat);
- /* FALLTHROUGH */
- case EXACTFA:
- utf8_flags = FOLDEQ_UTF8_NOMIX_ASCII;
- goto do_exactf;
-
- case EXACTFL:
- utf8_flags = FOLDEQ_LOCALE;
- goto do_exactf;
-
- case EXACTF: /* This node only generated for non-utf8 patterns */
- assert(! reginfo->is_utf8_pat);
- utf8_flags = 0;
- goto do_exactf;
-
- case EXACTFU_SS:
- case EXACTFU:
- utf8_flags = reginfo->is_utf8_pat ? FOLDEQ_S2_ALREADY_FOLDED : 0;
-
- do_exactf: {
- int c1, c2;
- U8 c1_utf8[UTF8_MAXBYTES+1], c2_utf8[UTF8_MAXBYTES+1];
-
- assert(STR_LEN(p) == reginfo->is_utf8_pat ? UTF8SKIP(STRING(p)) : 1);
-
- if (S_setup_EXACTISH_ST_c1_c2(aTHX_ p, &c1, c1_utf8, &c2, c2_utf8,
- reginfo))
- {
- if (c1 == CHRTEST_VOID) {
- /* Use full Unicode fold matching */
- char *tmpeol = reginfo->strend;
- STRLEN pat_len = reginfo->is_utf8_pat ? UTF8SKIP(STRING(p)) : 1;
- while (hardcount < max
- && foldEQ_utf8_flags(scan, &tmpeol, 0, utf8_target,
- STRING(p), NULL, pat_len,
- reginfo->is_utf8_pat, utf8_flags))
- {
- scan = tmpeol;
- tmpeol = reginfo->strend;
- hardcount++;
- }
- }
- else if (utf8_target) {
- if (c1 == c2) {
- while (scan < loceol
- && hardcount < max
- && memEQ(scan, c1_utf8, UTF8SKIP(scan)))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- }
- else {
- while (scan < loceol
- && hardcount < max
- && (memEQ(scan, c1_utf8, UTF8SKIP(scan))
- || memEQ(scan, c2_utf8, UTF8SKIP(scan))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- }
- }
- else if (c1 == c2) {
- while (scan < loceol && UCHARAT(scan) == c1) {
- scan++;
- }
- }
- else {
- while (scan < loceol &&
- (UCHARAT(scan) == c1 || UCHARAT(scan) == c2))
- {
- scan++;
- }
- }
- }
- break;
- }
- case ANYOF:
- if (utf8_target) {
- while (hardcount < max
- && scan < loceol
- && reginclass(prog, p, (U8*)scan, (U8*) loceol, utf8_target))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- } else {
- while (scan < loceol && REGINCLASS(prog, p, (U8*)scan))
- scan++;
- }
- break;
-
- /* The argument (FLAGS) to all the POSIX node types is the class number */
-
- case NPOSIXL:
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXL:
- if (! utf8_target) {
- while (scan < loceol && to_complement ^ cBOOL(isFOO_lc(FLAGS(p),
- *scan)))
- {
- scan++;
- }
- } else {
- while (hardcount < max && scan < loceol
- && to_complement ^ cBOOL(isFOO_utf8_lc(FLAGS(p),
- (U8 *) scan)))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- }
- break;
-
- case POSIXD:
- if (utf8_target) {
- goto utf8_posix;
- }
- /* FALLTHROUGH */
-
- case POSIXA:
- if (utf8_target && loceol - scan > max) {
-
- /* We didn't adjust <loceol> at the beginning of this routine
- * because is UTF-8, but it is actually ok to do so, since here, to
- * match, 1 char == 1 byte. */
- loceol = scan + max;
- }
- while (scan < loceol && _generic_isCC_A((U8) *scan, FLAGS(p))) {
- scan++;
- }
- break;
-
- case NPOSIXD:
- if (utf8_target) {
- to_complement = 1;
- goto utf8_posix;
- }
- /* FALLTHROUGH */
-
- case NPOSIXA:
- if (! utf8_target) {
- while (scan < loceol && ! _generic_isCC_A((U8) *scan, FLAGS(p))) {
- scan++;
- }
- }
- else {
-
- /* The complement of something that matches only ASCII matches all
- * non-ASCII, plus everything in ASCII that isn't in the class. */
- while (hardcount < max && scan < loceol
- && (! isASCII_utf8(scan)
- || ! _generic_isCC_A((U8) *scan, FLAGS(p))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- }
- break;
-
- case NPOSIXU:
- to_complement = 1;
- /* FALLTHROUGH */
-
- case POSIXU:
- if (! utf8_target) {
- while (scan < loceol && to_complement
- ^ cBOOL(_generic_isCC((U8) *scan, FLAGS(p))))
- {
- scan++;
- }
- }
- else {
- utf8_posix:
- classnum = (_char_class_number) FLAGS(p);
- if (classnum < _FIRST_NON_SWASH_CC) {
-
- /* Here, a swash is needed for above-Latin1 code points.
- * Process as many Latin1 code points using the built-in rules.
- * Go to another loop to finish processing upon encountering
- * the first Latin1 code point. We could do that in this loop
- * as well, but the other way saves having to test if the swash
- * has been loaded every time through the loop: extra space to
- * save a test. */
- while (hardcount < max && scan < loceol) {
- if (UTF8_IS_INVARIANT(*scan)) {
- if (! (to_complement ^ cBOOL(_generic_isCC((U8) *scan,
- classnum))))
- {
- break;
- }
- scan++;
- }
- else if (UTF8_IS_DOWNGRADEABLE_START(*scan)) {
- if (! (to_complement
- ^ cBOOL(_generic_isCC(TWO_BYTE_UTF8_TO_NATIVE(*scan,
- *(scan + 1)),
- classnum))))
- {
- break;
- }
- scan += 2;
- }
- else {
- goto found_above_latin1;
- }
-
- hardcount++;
- }
- }
- else {
- /* For these character classes, the knowledge of how to handle
- * every code point is compiled in to Perl via a macro. This
- * code is written for making the loops as tight as possible.
- * It could be refactored to save space instead */
- switch (classnum) {
- case _CC_ENUM_SPACE: /* XXX would require separate code
- if we revert the change of \v
- matching this */
- /* FALLTHROUGH */
- case _CC_ENUM_PSXSPC:
- while (hardcount < max
- && scan < loceol
- && (to_complement ^ cBOOL(isSPACE_utf8(scan))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- break;
- case _CC_ENUM_BLANK:
- while (hardcount < max
- && scan < loceol
- && (to_complement ^ cBOOL(isBLANK_utf8(scan))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- break;
- case _CC_ENUM_XDIGIT:
- while (hardcount < max
- && scan < loceol
- && (to_complement ^ cBOOL(isXDIGIT_utf8(scan))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- break;
- case _CC_ENUM_VERTSPACE:
- while (hardcount < max
- && scan < loceol
- && (to_complement ^ cBOOL(isVERTWS_utf8(scan))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- break;
- case _CC_ENUM_CNTRL:
- while (hardcount < max
- && scan < loceol
- && (to_complement ^ cBOOL(isCNTRL_utf8(scan))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- break;
- default:
- Perl_croak(aTHX_ "panic: regrepeat() node %d='%s' has an unexpected character class '%d'", OP(p), PL_reg_name[OP(p)], classnum);
- }
- }
- }
- break;
-
- found_above_latin1: /* Continuation of POSIXU and NPOSIXU */
-
- /* Load the swash if not already present */
- if (! PL_utf8_swash_ptrs[classnum]) {
- U8 flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
- PL_utf8_swash_ptrs[classnum] = _core_swash_init(
- "utf8",
- "",
- &PL_sv_undef, 1, 0,
- PL_XPosix_ptrs[classnum], &flags);
- }
-
- while (hardcount < max && scan < loceol
- && to_complement ^ cBOOL(_generic_utf8(
- classnum,
- scan,
- swash_fetch(PL_utf8_swash_ptrs[classnum],
- (U8 *) scan,
- TRUE))))
- {
- scan += UTF8SKIP(scan);
- hardcount++;
- }
- break;
-
- case LNBREAK:
- if (utf8_target) {
- while (hardcount < max && scan < loceol &&
- (c=is_LNBREAK_utf8_safe(scan, loceol))) {
- scan += c;
- hardcount++;
- }
- } else {
- /* LNBREAK can match one or two latin chars, which is ok, but we
- * have to use hardcount in this situation, and throw away the
- * adjustment to <loceol> done before the switch statement */
- loceol = reginfo->strend;
- while (scan < loceol && (c=is_LNBREAK_latin1_safe(scan, loceol))) {
- scan+=c;
- hardcount++;
- }
- }
- break;
-
- case BOUND:
- case BOUNDA:
- case BOUNDL:
- case BOUNDU:
- case EOS:
- case GPOS:
- case KEEPS:
- case NBOUND:
- case NBOUNDA:
- case NBOUNDL:
- case NBOUNDU:
- case OPFAIL:
- case SBOL:
- case SEOL:
- /* These are all 0 width, so match right here or not at all. */
- break;
-
- default:
- Perl_croak(aTHX_ "panic: regrepeat() called with unrecognized node type %d='%s'", OP(p), PL_reg_name[OP(p)]);
- assert(0); /* NOTREACHED */
-
- }
-
- if (hardcount)
- c = hardcount;
- else
- c = scan - *startposp;
- *startposp = scan;
-
- DEBUG_r({
- GET_RE_DEBUG_FLAGS_DECL;
- DEBUG_EXECUTE_r({
- SV * const prop = sv_newmortal();
- regprop(prog, prop, p, reginfo);
- PerlIO_printf(Perl_debug_log,
- "%*s %s can match %"IVdf" times out of %"IVdf"...\n",
- REPORT_CODE_OFF + depth*2, "", SvPVX_const(prop),(IV)c,(IV)max);
- });
- });
-
- return(c);
-}
-
-
-#if !defined(PERL_IN_XSUB_RE) || defined(PLUGGABLE_RE_EXTENSION)
-/*
-- regclass_swash - prepare the utf8 swash. Wraps the shared core version to
-create a copy so that changes the caller makes won't change the shared one.
-If <altsvp> is non-null, will return NULL in it, for back-compat.
- */
-SV *
-Perl_regclass_swash(pTHX_ const regexp *prog, const regnode* node, bool doinit, SV** listsvp, SV **altsvp)
-{
- PERL_ARGS_ASSERT_REGCLASS_SWASH;
-
- if (altsvp) {
- *altsvp = NULL;
- }
-
- return newSVsv(_get_regclass_nonbitmap_data(prog, node, doinit, listsvp, NULL));
-}
-
-SV *
-Perl__get_regclass_nonbitmap_data(pTHX_ const regexp *prog,
- const regnode* node,
- bool doinit,
- SV** listsvp,
- SV** only_utf8_locale_ptr)
-{
- /* For internal core use only.
- * Returns the swash for the input 'node' in the regex 'prog'.
- * If <doinit> is 'true', will attempt to create the swash if not already
- * done.
- * If <listsvp> is non-null, will return the printable contents of the
- * swash. This can be used to get debugging information even before the
- * swash exists, by calling this function with 'doinit' set to false, in
- * which case the components that will be used to eventually create the
- * swash are returned (in a printable form).
- * Tied intimately to how regcomp.c sets up the data structure */
-
- dVAR;
- SV *sw = NULL;
- SV *si = NULL; /* Input swash initialization string */
- SV* invlist = NULL;
-
- RXi_GET_DECL(prog,progi);
- const struct reg_data * const data = prog ? progi->data : NULL;
-
- PERL_ARGS_ASSERT__GET_REGCLASS_NONBITMAP_DATA;
-
- assert(ANYOF_FLAGS(node)
- & (ANYOF_UTF8|ANYOF_NONBITMAP_NON_UTF8|ANYOF_LOC_FOLD));
-
- if (data && data->count) {
- const U32 n = ARG(node);
-
- if (data->what[n] == 's') {
- SV * const rv = MUTABLE_SV(data->data[n]);
- AV * const av = MUTABLE_AV(SvRV(rv));
- SV **const ary = AvARRAY(av);
- U8 swash_init_flags = _CORE_SWASH_INIT_ACCEPT_INVLIST;
-
- si = *ary; /* ary[0] = the string to initialize the swash with */
-
- /* Elements 3 and 4 are either both present or both absent. [3] is
- * any inversion list generated at compile time; [4] indicates if
- * that inversion list has any user-defined properties in it. */
- if (av_tindex(av) >= 2) {
- if (only_utf8_locale_ptr
- && ary[2]
- && ary[2] != &PL_sv_undef)
- {
- *only_utf8_locale_ptr = ary[2];
- }
- else {
- assert(only_utf8_locale_ptr);
- *only_utf8_locale_ptr = NULL;
- }
-
- if (av_tindex(av) >= 3) {
- invlist = ary[3];
- if (SvUV(ary[4])) {
- swash_init_flags |= _CORE_SWASH_INIT_USER_DEFINED_PROPERTY;
- }
- }
- else {
- invlist = NULL;
- }
- }
-
- /* Element [1] is reserved for the set-up swash. If already there,
- * return it; if not, create it and store it there */
- if (ary[1] && SvROK(ary[1])) {
- sw = ary[1];
- }
- else if (doinit && ((si && si != &PL_sv_undef)
- || (invlist && invlist != &PL_sv_undef))) {
- assert(si);
- sw = _core_swash_init("utf8", /* the utf8 package */
- "", /* nameless */
- si,
- 1, /* binary */
- 0, /* not from tr/// */
- invlist,
- &swash_init_flags);
- (void)av_store(av, 1, sw);
- }
- }
- }
-
- /* If requested, return a printable version of what this swash matches */
- if (listsvp) {
- SV* matches_string = newSVpvs("");
-
- /* The swash should be used, if possible, to get the data, as it
- * contains the resolved data. But this function can be called at
- * compile-time, before everything gets resolved, in which case we
- * return the currently best available information, which is the string
- * that will eventually be used to do that resolving, 'si' */
- if ((! sw || (invlist = _get_swash_invlist(sw)) == NULL)
- && (si && si != &PL_sv_undef))
- {
- sv_catsv(matches_string, si);
- }
-
- /* Add the inversion list to whatever we have. This may have come from
- * the swash, or from an input parameter */
- if (invlist) {
- sv_catsv(matches_string, _invlist_contents(invlist));
- }
- *listsvp = matches_string;
- }
-
- return sw;
-}
-#endif /* !defined(PERL_IN_XSUB_RE) || defined(PLUGGABLE_RE_EXTENSION) */
-
-/*
- - reginclass - determine if a character falls into a character class
-
- n is the ANYOF regnode
- p is the target string
- p_end points to one byte beyond the end of the target string
- utf8_target tells whether p is in UTF-8.
-
- Returns true if matched; false otherwise.
-
- Note that this can be a synthetic start class, a combination of various
- nodes, so things you think might be mutually exclusive, such as locale,
- aren't. It can match both locale and non-locale
-
- */
-
-STATIC bool
-S_reginclass(pTHX_ regexp * const prog, const regnode * const n, const U8* const p, const U8* const p_end, const bool utf8_target)
-{
- dVAR;
- const char flags = ANYOF_FLAGS(n);
- bool match = FALSE;
- UV c = *p;
-
- PERL_ARGS_ASSERT_REGINCLASS;
-
- /* If c is not already the code point, get it. Note that
- * UTF8_IS_INVARIANT() works even if not in UTF-8 */
- if (! UTF8_IS_INVARIANT(c) && utf8_target) {
- STRLEN c_len = 0;
- c = utf8n_to_uvchr(p, p_end - p, &c_len,
- (UTF8_ALLOW_DEFAULT & UTF8_ALLOW_ANYUV)
- | UTF8_ALLOW_FFFF | UTF8_CHECK_ONLY);
- /* see [perl #37836] for UTF8_ALLOW_ANYUV; [perl #38293] for
- * UTF8_ALLOW_FFFF */
- if (c_len == (STRLEN)-1)
- Perl_croak(aTHX_ "Malformed UTF-8 character (fatal)");
- }
-
- /* If this character is potentially in the bitmap, check it */
- if (c < 256) {
- if (ANYOF_BITMAP_TEST(n, c))
- match = TRUE;
- else if (flags & ANYOF_NON_UTF8_NON_ASCII_ALL
- && ! utf8_target
- && ! isASCII(c))
- {
- match = TRUE;
- }
- else if (flags & ANYOF_LOCALE_FLAGS) {
- if (flags & ANYOF_LOC_FOLD) {
- if (ANYOF_BITMAP_TEST(n, PL_fold_locale[c])) {
- match = TRUE;
- }
- }
- if (! match && ANYOF_POSIXL_TEST_ANY_SET(n)) {
-
- /* The data structure is arranged so bits 0, 2, 4, ... are set
- * if the class includes the Posix character class given by
- * bit/2; and 1, 3, 5, ... are set if the class includes the
- * complemented Posix class given by int(bit/2). So we loop
- * through the bits, each time changing whether we complement
- * the result or not. Suppose for the sake of illustration
- * that bits 0-3 mean respectively, \w, \W, \s, \S. If bit 0
- * is set, it means there is a match for this ANYOF node if the
- * character is in the class given by the expression (0 / 2 = 0
- * = \w). If it is in that class, isFOO_lc() will return 1,
- * and since 'to_complement' is 0, the result will stay TRUE,
- * and we exit the loop. Suppose instead that bit 0 is 0, but
- * bit 1 is 1. That means there is a match if the character
- * matches \W. We won't bother to call isFOO_lc() on bit 0,
- * but will on bit 1. On the second iteration 'to_complement'
- * will be 1, so the exclusive or will reverse things, so we
- * are testing for \W. On the third iteration, 'to_complement'
- * will be 0, and we would be testing for \s; the fourth
- * iteration would test for \S, etc.
- *
- * Note that this code assumes that all the classes are closed
- * under folding. For example, if a character matches \w, then
- * its fold does too; and vice versa. This should be true for
- * any well-behaved locale for all the currently defined Posix
- * classes, except for :lower: and :upper:, which are handled
- * by the pseudo-class :cased: which matches if either of the
- * other two does. To get rid of this assumption, an outer
- * loop could be used below to iterate over both the source
- * character, and its fold (if different) */
-
- int count = 0;
- int to_complement = 0;
-
- while (count < ANYOF_MAX) {
- if (ANYOF_POSIXL_TEST(n, count)
- && to_complement ^ cBOOL(isFOO_lc(count/2, (U8) c)))
- {
- match = TRUE;
- break;
- }
- count++;
- to_complement ^= 1;
- }
- }
- }
- }
-
-
- /* If the bitmap didn't (or couldn't) match, and something outside the
- * bitmap could match, try that. */
- if (!match) {
- if (c >= 256 && (flags & ANYOF_ABOVE_LATIN1_ALL)) {
- match = TRUE; /* Everything above 255 matches */
- }
- else if ((flags & ANYOF_NONBITMAP_NON_UTF8)
- || (utf8_target && (flags & ANYOF_UTF8))
- || ((flags & ANYOF_LOC_FOLD)
- && IN_UTF8_CTYPE_LOCALE
- && ARG(n) != ANYOF_NONBITMAP_EMPTY))
- {
- SV* only_utf8_locale = NULL;
- SV * const sw = _get_regclass_nonbitmap_data(prog, n, TRUE, 0,
- &only_utf8_locale);
- if (sw) {
- U8 utf8_buffer[2];
- U8 * utf8_p;
- if (utf8_target) {
- utf8_p = (U8 *) p;
- } else { /* Convert to utf8 */
- utf8_p = utf8_buffer;
- append_utf8_from_native_byte(*p, &utf8_p);
- utf8_p = utf8_buffer;
- }
-
- if (swash_fetch(sw, utf8_p, TRUE)) {
- match = TRUE;
- }
- }
- if (! match && only_utf8_locale && IN_UTF8_CTYPE_LOCALE) {
- match = _invlist_contains_cp(only_utf8_locale, c);
- }
- }
-
- if (UNICODE_IS_SUPER(c)
- && (flags & ANYOF_WARN_SUPER)
- && ckWARN_d(WARN_NON_UNICODE))
- {
- Perl_warner(aTHX_ packWARN(WARN_NON_UNICODE),
- "Matched non-Unicode code point 0x%04"UVXf" against Unicode property; may not be portable", c);
- }
- }
-
-#if ANYOF_INVERT != 1
- /* Depending on compiler optimization cBOOL takes time, so if don't have to
- * use it, don't */
-# error ANYOF_INVERT needs to be set to 1, or guarded with cBOOL below,
-#endif
-
- /* The xor complements the return if to invert: 1^1 = 0, 1^0 = 1 */
- return (flags & ANYOF_INVERT) ^ match;
-}
-
-STATIC U8 *
-S_reghop3(U8 *s, SSize_t off, const U8* lim)
-{
- /* return the position 'off' UTF-8 characters away from 's', forward if
- * 'off' >= 0, backwards if negative. But don't go outside of position
- * 'lim', which better be < s if off < 0 */
-
- dVAR;
-
- PERL_ARGS_ASSERT_REGHOP3;
-
- if (off >= 0) {
- while (off-- && s < lim) {
- /* XXX could check well-formedness here */
- s += UTF8SKIP(s);
- }
- }
- else {
- while (off++ && s > lim) {
- s--;
- if (UTF8_IS_CONTINUED(*s)) {
- while (s > lim && UTF8_IS_CONTINUATION(*s))
- s--;
- }
- /* XXX could check well-formedness here */
- }
- }
- return s;
-}
-
-STATIC U8 *
-S_reghop4(U8 *s, SSize_t off, const U8* llim, const U8* rlim)
-{
- dVAR;
-
- PERL_ARGS_ASSERT_REGHOP4;
-
- if (off >= 0) {
- while (off-- && s < rlim) {
- /* XXX could check well-formedness here */
- s += UTF8SKIP(s);
- }
- }
- else {
- while (off++ && s > llim) {
- s--;
- if (UTF8_IS_CONTINUED(*s)) {
- while (s > llim && UTF8_IS_CONTINUATION(*s))
- s--;
- }
- /* XXX could check well-formedness here */
- }
- }
- return s;
-}
-
-/* like reghop3, but returns NULL on overrun, rather than returning last
- * char pos */
-
-STATIC U8 *
-S_reghopmaybe3(U8* s, SSize_t off, const U8* lim)
-{
- dVAR;
-
- PERL_ARGS_ASSERT_REGHOPMAYBE3;
-
- if (off >= 0) {
- while (off-- && s < lim) {
- /* XXX could check well-formedness here */
- s += UTF8SKIP(s);
- }
- if (off >= 0)
- return NULL;
- }
- else {
- while (off++ && s > lim) {
- s--;
- if (UTF8_IS_CONTINUED(*s)) {
- while (s > lim && UTF8_IS_CONTINUATION(*s))
- s--;
- }
- /* XXX could check well-formedness here */
- }
- if (off <= 0)
- return NULL;
- }
- return s;
-}
-
-
-/* when executing a regex that may have (?{}), extra stuff needs setting
- up that will be visible to the called code, even before the current
- match has finished. In particular:
-
- * $_ is localised to the SV currently being matched;
- * pos($_) is created if necessary, ready to be updated on each call-out
- to code;
- * a fake PMOP is created that can be set to PL_curpm (normally PL_curpm
- isn't set until the current pattern is successfully finished), so that
- $1 etc of the match-so-far can be seen;
- * save the old values of subbeg etc of the current regex, and set then
- to the current string (again, this is normally only done at the end
- of execution)
-*/
-
-static void
-S_setup_eval_state(pTHX_ regmatch_info *const reginfo)
-{
- MAGIC *mg;
- regexp *const rex = ReANY(reginfo->prog);
- regmatch_info_aux_eval *eval_state = reginfo->info_aux_eval;
-
- eval_state->rex = rex;
-
- if (reginfo->sv) {
- /* Make $_ available to executed code. */
- if (reginfo->sv != DEFSV) {
- SAVE_DEFSV;
- DEFSV_set(reginfo->sv);
- }
-
- if (!(mg = mg_find_mglob(reginfo->sv))) {
- /* prepare for quick setting of pos */
- mg = sv_magicext_mglob(reginfo->sv);
- mg->mg_len = -1;
- }
- eval_state->pos_magic = mg;
- eval_state->pos = mg->mg_len;
- eval_state->pos_flags = mg->mg_flags;
- }
- else
- eval_state->pos_magic = NULL;
-
- if (!PL_reg_curpm) {
- /* PL_reg_curpm is a fake PMOP that we can attach the current
- * regex to and point PL_curpm at, so that $1 et al are visible
- * within a /(?{})/. It's just allocated once per interpreter the
- * first time its needed */
- Newxz(PL_reg_curpm, 1, PMOP);
-#ifdef USE_ITHREADS
- {
- SV* const repointer = &PL_sv_undef;
- /* this regexp is also owned by the new PL_reg_curpm, which
- will try to free it. */
- av_push(PL_regex_padav, repointer);
- PL_reg_curpm->op_pmoffset = av_tindex(PL_regex_padav);
- PL_regex_pad = AvARRAY(PL_regex_padav);
- }
-#endif
- }
- SET_reg_curpm(reginfo->prog);
- eval_state->curpm = PL_curpm;
- PL_curpm = PL_reg_curpm;
- if (RXp_MATCH_COPIED(rex)) {
- /* Here is a serious problem: we cannot rewrite subbeg,
- since it may be needed if this match fails. Thus
- $` inside (?{}) could fail... */
- eval_state->subbeg = rex->subbeg;
- eval_state->sublen = rex->sublen;
- eval_state->suboffset = rex->suboffset;
- eval_state->subcoffset = rex->subcoffset;
-#ifdef PERL_ANY_COW
- eval_state->saved_copy = rex->saved_copy;
-#endif
- RXp_MATCH_COPIED_off(rex);
- }
- else
- eval_state->subbeg = NULL;
- rex->subbeg = (char *)reginfo->strbeg;
- rex->suboffset = 0;
- rex->subcoffset = 0;
- rex->sublen = reginfo->strend - reginfo->strbeg;
-}
-
-
-/* destructor to clear up regmatch_info_aux and regmatch_info_aux_eval */
-
-static void
-S_cleanup_regmatch_info_aux(pTHX_ void *arg)
-{
- dVAR;
- regmatch_info_aux *aux = (regmatch_info_aux *) arg;
- regmatch_info_aux_eval *eval_state = aux->info_aux_eval;
- regmatch_slab *s;
-
- Safefree(aux->poscache);
-
- if (eval_state) {
-
- /* undo the effects of S_setup_eval_state() */
-
- if (eval_state->subbeg) {
- regexp * const rex = eval_state->rex;
- rex->subbeg = eval_state->subbeg;
- rex->sublen = eval_state->sublen;
- rex->suboffset = eval_state->suboffset;
- rex->subcoffset = eval_state->subcoffset;
-#ifdef PERL_ANY_COW
- rex->saved_copy = eval_state->saved_copy;
-#endif
- RXp_MATCH_COPIED_on(rex);
- }
- if (eval_state->pos_magic)
- {
- eval_state->pos_magic->mg_len = eval_state->pos;
- eval_state->pos_magic->mg_flags =
- (eval_state->pos_magic->mg_flags & ~MGf_BYTES)
- | (eval_state->pos_flags & MGf_BYTES);
- }
-
- PL_curpm = eval_state->curpm;
- }
-
- PL_regmatch_state = aux->old_regmatch_state;
- PL_regmatch_slab = aux->old_regmatch_slab;
-
- /* free all slabs above current one - this must be the last action
- * of this function, as aux and eval_state are allocated within
- * slabs and may be freed here */
-
- s = PL_regmatch_slab->next;
- if (s) {
- PL_regmatch_slab->next = NULL;
- while (s) {
- regmatch_slab * const osl = s;
- s = s->next;
- Safefree(osl);
- }
- }
-}
-
-
-STATIC void
-S_to_utf8_substr(pTHX_ regexp *prog)
-{
- /* Converts substr fields in prog from bytes to UTF-8, calling fbm_compile
- * on the converted value */
-
- int i = 1;
-
- PERL_ARGS_ASSERT_TO_UTF8_SUBSTR;
-
- do {
- if (prog->substrs->data[i].substr
- && !prog->substrs->data[i].utf8_substr) {
- SV* const sv = newSVsv(prog->substrs->data[i].substr);
- prog->substrs->data[i].utf8_substr = sv;
- sv_utf8_upgrade(sv);
- if (SvVALID(prog->substrs->data[i].substr)) {
- if (SvTAIL(prog->substrs->data[i].substr)) {
- /* Trim the trailing \n that fbm_compile added last
- time. */
- SvCUR_set(sv, SvCUR(sv) - 1);
- /* Whilst this makes the SV technically "invalid" (as its
- buffer is no longer followed by "\0") when fbm_compile()
- adds the "\n" back, a "\0" is restored. */
- fbm_compile(sv, FBMcf_TAIL);
- } else
- fbm_compile(sv, 0);
- }
- if (prog->substrs->data[i].substr == prog->check_substr)
- prog->check_utf8 = sv;
- }
- } while (i--);
-}
-
-STATIC bool
-S_to_byte_substr(pTHX_ regexp *prog)
-{
- /* Converts substr fields in prog from UTF-8 to bytes, calling fbm_compile
- * on the converted value; returns FALSE if can't be converted. */
-
- dVAR;
- int i = 1;
-
- PERL_ARGS_ASSERT_TO_BYTE_SUBSTR;
-
- do {
- if (prog->substrs->data[i].utf8_substr
- && !prog->substrs->data[i].substr) {
- SV* sv = newSVsv(prog->substrs->data[i].utf8_substr);
- if (! sv_utf8_downgrade(sv, TRUE)) {
- return FALSE;
- }
- if (SvVALID(prog->substrs->data[i].utf8_substr)) {
- if (SvTAIL(prog->substrs->data[i].utf8_substr)) {
- /* Trim the trailing \n that fbm_compile added last
- time. */
- SvCUR_set(sv, SvCUR(sv) - 1);
- fbm_compile(sv, FBMcf_TAIL);
- } else
- fbm_compile(sv, 0);
- }
- prog->substrs->data[i].substr = sv;
- if (prog->substrs->data[i].utf8_substr == prog->check_utf8)
- prog->check_substr = sv;
- }
- } while (i--);
-
- return TRUE;
-}
-
-/*
- * 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