1 /* This file is part of the indirect Perl module.
2 * See http://search.cpan.org/dist/indirect/ */
4 #define PERL_NO_GET_CONTEXT
9 /* --- XS helpers ---------------------------------------------------------- */
11 #define XSH_PACKAGE "indirect"
18 /* ... op => source position map ........................................... */
28 #define PTABLE_NAME ptable
29 #define PTABLE_VAL_FREE(V) if (V) { indirect_op_info_t *oi = (V); XSH_LOCAL_FREE(oi->buf, oi->size, char); XSH_LOCAL_FREE(oi, 1, indirect_op_info_t); }
30 #define PTABLE_NEED_DELETE 1
31 #define PTABLE_NEED_WALK 0
33 #include "xsh/ptable.h"
35 /* XSH_LOCAL_FREE() always need aTHX */
36 #define ptable_store(T, K, V) ptable_store(aTHX_ (T), (K), (V))
37 #define ptable_delete(T, K) ptable_delete(aTHX_ (T), (K))
38 #define ptable_clear(T) ptable_clear(aTHX_ (T))
39 #define ptable_free(T) ptable_free(aTHX_ (T))
41 /* ... Lexical hints ....................................................... */
43 #define XSH_HINTS_TYPE_SV 1
45 #include "xsh/hints.h"
47 /* ... Thread-local storage ................................................ */
54 #define XSH_THREADS_USER_CONTEXT 1
55 #define XSH_THREADS_USER_CLONE_NEEDS_DUP 1
56 #define XSH_THREADS_COMPILE_TIME_PROTECTION 1
60 static void xsh_user_clone(pTHX_ const xsh_user_cxt_t *old_cxt, xsh_user_cxt_t *new_cxt, CLONE_PARAMS *params) {
61 new_cxt->map = ptable_new(32);
62 new_cxt->global_code = xsh_dup_inc(old_cxt->global_code, params);
67 #endif /* XSH_THREADSAFE */
69 #include "xsh/threads.h"
71 /* ... Lexical hints, continued ............................................ */
73 static SV *indirect_hint(pTHX) {
74 #define indirect_hint() indirect_hint(aTHX)
77 #if XSH_HAS_PERL(5, 10, 0) || defined(PL_parser)
82 hint = xsh_hints_fetch();
83 if (hint && SvOK(hint)) {
84 return xsh_hints_detag(hint);
87 if (xsh_is_loaded(&XSH_CXT))
88 return XSH_CXT.global_code;
94 /* --- Compatibility wrappers ---------------------------------------------- */
97 # define SvPV_const SvPV
100 #ifndef SvPV_nolen_const
101 # define SvPV_nolen_const SvPV_nolen
105 # define SvPVX_const SvPVX
108 #ifndef SvREFCNT_inc_simple_void_NN
109 # ifdef SvREFCNT_inc_simple_NN
110 # define SvREFCNT_inc_simple_void_NN SvREFCNT_inc_simple_NN
112 # define SvREFCNT_inc_simple_void_NN SvREFCNT_inc
116 #ifndef sv_catpvn_nomg
117 # define sv_catpvn_nomg sv_catpvn
121 # define mPUSHp(P, L) PUSHs(sv_2mortal(newSVpvn((P), (L))))
125 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
129 # define HvNAME_get(H) HvNAME(H)
132 #ifndef HvNAMELEN_get
133 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
136 #if XSH_HAS_PERL(5, 10, 0) || defined(PL_parser)
138 # define PL_linestr PL_parser->linestr
141 # define PL_bufptr PL_parser->bufptr
143 # ifndef PL_oldbufptr
144 # define PL_oldbufptr PL_parser->oldbufptr
146 # ifndef PL_lex_inwhat
147 # define PL_lex_inwhat PL_parser->lex_inwhat
151 # define PL_linestr PL_Ilinestr
154 # define PL_bufptr PL_Ibufptr
156 # ifndef PL_oldbufptr
157 # define PL_oldbufptr PL_Ioldbufptr
159 # ifndef PL_lex_inwhat
160 # define PL_lex_inwhat PL_Ilex_inwhat
164 /* ... Safe version of call_sv() ........................................... */
166 static I32 indirect_call_sv(pTHX_ SV *sv, I32 flags) {
167 #define indirect_call_sv(S, F) indirect_call_sv(aTHX_ (S), (F))
169 PERL_CONTEXT saved_cx;
170 SV *saved_errsv = NULL;
173 if (IN_PERL_COMPILETIME && PL_errors)
174 sv_catsv(PL_errors, ERRSV);
176 saved_errsv = newSVsv(ERRSV);
180 cxix = (cxstack_ix < cxstack_max) ? (cxstack_ix + 1) : Perl_cxinc(aTHX);
181 /* The last popped context will be reused by call_sv(), but our callers may
182 * still need its previous value. Back it up so that it isn't clobbered. */
183 saved_cx = cxstack[cxix];
185 ret = call_sv(sv, flags | G_EVAL);
187 cxstack[cxix] = saved_cx;
190 /* Discard the old ERRSV, and reuse the variable to temporarily store the
193 sv_setsv(saved_errsv, ERRSV);
195 saved_errsv = newSVsv(ERRSV);
197 /* Immediately flush all errors. */
198 if (IN_PERL_COMPILETIME) {
199 #if XSH_HAS_PERL(5, 10, 0) || defined(PL_parser)
201 ++PL_parser->error_count;
202 #elif defined(PL_error_count)
208 sv_setsv(ERRSV, PL_errors);
209 SvCUR_set(PL_errors, 0);
212 sv_catsv(ERRSV, saved_errsv);
213 SvREFCNT_dec(saved_errsv);
215 } else if (saved_errsv) {
216 /* If IN_PERL_COMPILETIME && PL_errors, then the old ERRSV has already been
217 * added to PL_errors. Otherwise, just restore it to ERRSV, as if no eval
218 * block has ever been executed. */
219 sv_setsv(ERRSV, saved_errsv);
220 SvREFCNT_dec(saved_errsv);
226 /* --- Check functions ----------------------------------------------------- */
228 /* ... op => source position map, continued ................................ */
230 static void indirect_map_store(pTHX_ const OP *o, STRLEN pos, SV *sv, line_t line) {
231 #define indirect_map_store(O, P, N, L) indirect_map_store(aTHX_ (O), (P), (N), (L))
232 indirect_op_info_t *oi;
237 /* No need to check for XSH_CXT.map != NULL because this code path is always
238 * guarded by indirect_hint(). */
240 if (!(oi = ptable_fetch(XSH_CXT.map, o))) {
241 XSH_LOCAL_ALLOC(oi, 1, indirect_op_info_t);
242 ptable_store(XSH_CXT.map, o, oi);
248 s = SvPV_const(sv, len);
254 if (len > oi->size) {
255 XSH_LOCAL_REALLOC(oi->buf, oi->size, len, char);
258 Copy(s, oi->buf, len, char);
265 static const indirect_op_info_t *indirect_map_fetch(pTHX_ const OP *o) {
266 #define indirect_map_fetch(O) indirect_map_fetch(aTHX_ (O))
269 /* No need to check for XSH_CXT.map != NULL because this code path is always
270 * guarded by indirect_hint(). */
272 return ptable_fetch(XSH_CXT.map, o);
275 static void indirect_map_delete(pTHX_ const OP *o) {
276 #define indirect_map_delete(O) indirect_map_delete(aTHX_ (O))
279 if (xsh_is_loaded(&XSH_CXT) && XSH_CXT.map)
280 ptable_delete(XSH_CXT.map, o);
283 /* ... Heuristics for finding a string in the source buffer ................ */
285 static int indirect_find(pTHX_ SV *name_sv, const char *line_bufptr, STRLEN *name_pos) {
286 #define indirect_find(NSV, LBP, NP) indirect_find(aTHX_ (NSV), (LBP), (NP))
287 STRLEN name_len, line_len;
288 const char *name, *name_end;
289 const char *line, *line_end;
292 line = SvPV_const(PL_linestr, line_len);
293 line_end = line + line_len;
295 name = SvPV_const(name_sv, name_len);
296 if (name_len >= 1 && *name == '$') {
299 while (line_bufptr < line_end && *line_bufptr != '$')
301 if (line_bufptr >= line_end)
304 name_end = name + name_len;
308 p = ninstr(p, line_end, name, name_end);
311 if (!isALNUM(p[name_len]))
313 /* p points to a word that has name as prefix, skip the rest of the word */
319 *name_pos = p - line;
324 /* ... ck_const ............................................................ */
326 static OP *(*indirect_old_ck_const)(pTHX_ OP *) = 0;
328 static OP *indirect_ck_const(pTHX_ OP *o) {
329 o = indirect_old_ck_const(aTHX_ o);
331 if (indirect_hint()) {
334 if (SvPOK(sv) && (SvTYPE(sv) >= SVt_PV)) {
337 if (indirect_find(sv, PL_oldbufptr, &pos)) {
340 /* If the constant is equal to the current package name, try to look for
341 * a "__PACKAGE__" coming before what we got. We only need to check this
342 * when we already had a match because __PACKAGE__ can only appear in
343 * direct method calls ("new __PACKAGE__" is a syntax error). */
346 && len == (STRLEN) HvNAMELEN_get(PL_curstash)
347 && memcmp(SvPVX(sv), HvNAME_get(PL_curstash), len) == 0) {
349 SV *pkg = sv_newmortal();
350 sv_setpvn(pkg, "__PACKAGE__", sizeof("__PACKAGE__")-1);
352 if (indirect_find(pkg, PL_oldbufptr, &pos_pkg) && pos_pkg < pos) {
358 indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
364 indirect_map_delete(o);
368 /* ... ck_rv2sv ............................................................ */
370 static OP *(*indirect_old_ck_rv2sv)(pTHX_ OP *) = 0;
372 static OP *indirect_ck_rv2sv(pTHX_ OP *o) {
373 if (indirect_hint()) {
374 OP *op = cUNOPo->op_first;
376 const char *name = NULL;
378 OPCODE type = (OPCODE) op->op_type;
383 GV *gv = cGVOPx_gv(op);
389 if ((PL_opargs[type] & OA_CLASS_MASK) == OA_SVOP) {
390 SV *nsv = cSVOPx_sv(op);
391 if (SvPOK(nsv) && (SvTYPE(nsv) >= SVt_PV))
392 name = SvPV_const(nsv, len);
398 sv = sv_2mortal(newSVpvn("$", 1));
399 sv_catpvn_nomg(sv, name, len);
400 if (!indirect_find(sv, PL_oldbufptr, &pos)) {
401 /* If it failed, retry without the current stash */
402 const char *stash = HvNAME_get(PL_curstash);
403 STRLEN stashlen = HvNAMELEN_get(PL_curstash);
405 if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
406 || name[stashlen] != ':' || name[stashlen+1] != ':') {
407 /* Failed again ? Try to remove main */
410 if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
411 || name[stashlen] != ':' || name[stashlen+1] != ':')
415 sv_setpvn(sv, "$", 1);
417 sv_catpvn_nomg(sv, name + stashlen, len - stashlen);
418 if (!indirect_find(sv, PL_oldbufptr, &pos))
422 o = indirect_old_ck_rv2sv(aTHX_ o);
424 indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
429 o = indirect_old_ck_rv2sv(aTHX_ o);
431 indirect_map_delete(o);
435 /* ... ck_padany ........................................................... */
437 static OP *(*indirect_old_ck_padany)(pTHX_ OP *) = 0;
439 static OP *indirect_ck_padany(pTHX_ OP *o) {
440 o = indirect_old_ck_padany(aTHX_ o);
442 if (indirect_hint()) {
444 const char *s = PL_oldbufptr, *t = PL_bufptr - 1;
446 while (s < t && isSPACE(*s)) ++s;
447 if (*s == '$' && ++s <= t) {
448 while (s < t && isSPACE(*s)) ++s;
449 while (s < t && isSPACE(*t)) --t;
450 sv = sv_2mortal(newSVpvn("$", 1));
451 sv_catpvn_nomg(sv, s, t - s + 1);
452 indirect_map_store(o, s - SvPVX_const(PL_linestr),
453 sv, CopLINE(&PL_compiling));
458 indirect_map_delete(o);
462 /* ... ck_scope ............................................................ */
464 static OP *(*indirect_old_ck_scope) (pTHX_ OP *) = 0;
465 static OP *(*indirect_old_ck_lineseq)(pTHX_ OP *) = 0;
467 static OP *indirect_ck_scope(pTHX_ OP *o) {
468 OP *(*old_ck)(pTHX_ OP *) = 0;
470 switch (o->op_type) {
471 case OP_SCOPE: old_ck = indirect_old_ck_scope; break;
472 case OP_LINESEQ: old_ck = indirect_old_ck_lineseq; break;
476 if (indirect_hint()) {
477 indirect_map_store(o, PL_oldbufptr - SvPVX_const(PL_linestr),
478 NULL, CopLINE(&PL_compiling));
482 indirect_map_delete(o);
486 /* We don't need to clean the map entries for leave ops because they can only
487 * be created by mutating from a lineseq. */
489 /* ... ck_method ........................................................... */
491 static OP *(*indirect_old_ck_method)(pTHX_ OP *) = 0;
493 static OP *indirect_ck_method(pTHX_ OP *o) {
494 if (indirect_hint()) {
495 OP *op = cUNOPo->op_first;
497 /* Indirect method call is only possible when the method is a bareword, so
498 * don't trip up on $obj->$meth. */
499 if (op && op->op_type == OP_CONST) {
500 const indirect_op_info_t *oi = indirect_map_fetch(op);
508 sv = sv_2mortal(newSVpvn(oi->buf, oi->len));
510 /* Keep the old line so that we really point to the first line of the
514 o = indirect_old_ck_method(aTHX_ o);
515 /* o may now be a method_named */
517 indirect_map_store(o, pos, sv, line);
523 o = indirect_old_ck_method(aTHX_ o);
525 indirect_map_delete(o);
529 /* ... ck_method_named ..................................................... */
531 /* "use foo/no foo" compiles its call to import/unimport directly to a
532 * method_named op. */
534 static OP *(*indirect_old_ck_method_named)(pTHX_ OP *) = 0;
536 static OP *indirect_ck_method_named(pTHX_ OP *o) {
537 if (indirect_hint()) {
543 if (!SvPOK(sv) || (SvTYPE(sv) < SVt_PV))
545 sv = sv_mortalcopy(sv);
547 if (!indirect_find(sv, PL_oldbufptr, &pos))
549 line = CopLINE(&PL_compiling);
551 o = indirect_old_ck_method_named(aTHX_ o);
553 indirect_map_store(o, pos, sv, line);
558 o = indirect_old_ck_method_named(aTHX_ o);
560 indirect_map_delete(o);
564 /* ... ck_entersub ......................................................... */
566 static OP *(*indirect_old_ck_entersub)(pTHX_ OP *) = 0;
568 static OP *indirect_ck_entersub(pTHX_ OP *o) {
569 SV *code = indirect_hint();
571 o = indirect_old_ck_entersub(aTHX_ o);
574 const indirect_op_info_t *moi, *ooi;
580 lop = (LISTOP *) oop;
581 if (!(lop->op_flags & OPf_KIDS))
584 } while (oop->op_type != OP_PUSHMARK);
585 oop = OpSIBLING(oop);
591 switch (oop->op_type) {
602 if (mop->op_type == OP_METHOD)
603 mop = cUNOPx(mop)->op_first;
604 else if (mop->op_type != OP_METHOD_NAMED)
607 moi = indirect_map_fetch(mop);
611 ooi = indirect_map_fetch(oop);
615 /* When positions are identical, the method and the object must have the
616 * same name. But it also means that it is an indirect call, as "foo->foo"
617 * results in different positions. */
618 if ( moi->line < ooi->line
619 || (moi->line == ooi->line && moi->pos <= ooi->pos)) {
627 file = sv_2mortal(newSVpv(CopFILE(&PL_compiling), 0));
629 file = sv_mortalcopy(CopFILESV(&PL_compiling));
634 mPUSHp(ooi->buf, ooi->len);
635 mPUSHp(moi->buf, moi->len);
640 indirect_call_sv(code, G_VOID);
653 /* --- Module setup/teardown ----------------------------------------------- */
655 static void xsh_user_global_setup(pTHX) {
656 xsh_ck_replace(OP_CONST, indirect_ck_const, &indirect_old_ck_const);
657 xsh_ck_replace(OP_RV2SV, indirect_ck_rv2sv, &indirect_old_ck_rv2sv);
658 xsh_ck_replace(OP_PADANY, indirect_ck_padany, &indirect_old_ck_padany);
659 xsh_ck_replace(OP_SCOPE, indirect_ck_scope, &indirect_old_ck_scope);
660 xsh_ck_replace(OP_LINESEQ, indirect_ck_scope, &indirect_old_ck_lineseq);
662 xsh_ck_replace(OP_METHOD, indirect_ck_method,
663 &indirect_old_ck_method);
664 xsh_ck_replace(OP_METHOD_NAMED, indirect_ck_method_named,
665 &indirect_old_ck_method_named);
666 xsh_ck_replace(OP_ENTERSUB, indirect_ck_entersub,
667 &indirect_old_ck_entersub);
672 static void xsh_user_local_setup(pTHX_ xsh_user_cxt_t *cxt) {
675 stash = gv_stashpvn(XSH_PACKAGE, XSH_PACKAGE_LEN, 1);
676 newCONSTSUB(stash, "I_THREADSAFE", newSVuv(XSH_THREADSAFE));
677 newCONSTSUB(stash, "I_FORKSAFE", newSVuv(XSH_FORKSAFE));
679 cxt->map = ptable_new(32);
680 cxt->global_code = NULL;
685 static void xsh_user_local_teardown(pTHX_ xsh_user_cxt_t *cxt) {
686 SvREFCNT_dec(cxt->global_code);
687 cxt->global_code = NULL;
689 ptable_free(cxt->map);
695 static void xsh_user_global_teardown(pTHX) {
696 xsh_ck_restore(OP_CONST, &indirect_old_ck_const);
697 xsh_ck_restore(OP_RV2SV, &indirect_old_ck_rv2sv);
698 xsh_ck_restore(OP_PADANY, &indirect_old_ck_padany);
699 xsh_ck_restore(OP_SCOPE, &indirect_old_ck_scope);
700 xsh_ck_restore(OP_LINESEQ, &indirect_old_ck_lineseq);
702 xsh_ck_restore(OP_METHOD, &indirect_old_ck_method);
703 xsh_ck_restore(OP_METHOD_NAMED, &indirect_old_ck_method_named);
704 xsh_ck_restore(OP_ENTERSUB, &indirect_old_ck_entersub);
709 /* --- XS ------------------------------------------------------------------ */
711 MODULE = indirect PACKAGE = indirect
729 #endif /* XSH_THREADSAFE */
737 else if (SvROK(code))
739 RETVAL = xsh_hints_tag(code);
749 else if (SvROK(code))
753 SvREFCNT_dec(XSH_CXT.global_code);
754 XSH_CXT.global_code = SvREFCNT_inc(code);