3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
9 * Control ops (cops) are one of the two ops OP_NEXTSTATE and OP_DBSTATE,
10 * that (loosely speaking) are separate statements.
11 * They hold information important for lexical state and error reporting.
12 * At run time, PL_curcop is set to point to the most recently executed cop,
13 * and thus can be used to determine our current state.
16 /* A jmpenv packages the state required to perform a proper non-local jump.
17 * Note that there is a PL_start_env initialized when perl starts, and
18 * PL_top_env points to this initially, so PL_top_env should always be
21 * Existence of a non-null PL_top_env->je_prev implies it is valid to call
22 * longjmp() at that runlevel (we make sure PL_start_env.je_prev is always
23 * null to ensure this).
25 * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
26 * establish a local jmpenv to handle exception traps. Care must be taken
27 * to restore the previous value of je_mustcatch before exiting the
28 * stack frame iff JMPENV_PUSH was not called in that stack frame.
33 struct jmpenv * je_prev;
34 Sigjmp_buf je_buf; /* only for use if !je_throw */
35 int je_ret; /* last exception thrown */
36 bool je_mustcatch; /* need to call longjmp()? */
39 typedef struct jmpenv JMPENV;
42 #define OP_REG_TO_MEM PL_opsave = op
43 #define OP_MEM_TO_REG op = PL_opsave
45 #define OP_REG_TO_MEM NOOP
46 #define OP_MEM_TO_REG NOOP
50 * How to build the first jmpenv.
52 * top_env needs to be non-zero. It points to an area
53 * in which longjmp() stuff is stored, as C callstack
54 * info there at least is thread specific this has to
55 * be per-thread. Otherwise a 'die' in a thread gives
56 * that thread the C stack of last thread to do an eval {}!
59 #define JMPENV_BOOTSTRAP \
61 Zero(&PL_start_env, 1, JMPENV); \
62 PL_start_env.je_ret = -1; \
63 PL_start_env.je_mustcatch = TRUE; \
64 PL_top_env = &PL_start_env; \
68 * PERL_FLEXIBLE_EXCEPTIONS
70 * All the flexible exceptions code has been removed.
71 * See the following threads for details:
73 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-07/msg00378.html
75 * Joshua's original patches (which weren't applied) and discussion:
77 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01396.html
78 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01489.html
79 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01491.html
80 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01608.html
81 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02144.html
82 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02998.html
84 * Chip's reworked patch and discussion:
86 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1999-03/msg00520.html
88 * The flaw in these patches (which went unnoticed at the time) was
89 * that they moved some code that could potentially die() out of the
90 * region protected by the setjmp()s. This caused exceptions within
91 * END blocks and such to not be handled by the correct setjmp().
93 * The original patches that introduces flexible exceptions were:
95 * http://public.activestate.com/cgi-bin/perlbrowse?patch=3386
96 * http://public.activestate.com/cgi-bin/perlbrowse?patch=5162
99 #define dJMPENV JMPENV cur_env
101 #define JMPENV_PUSH(v) \
104 int i = 0; JMPENV *p = PL_top_env; \
105 while (p) { i++; p = p->je_prev; } \
106 Perl_deb(aTHX_ "JUMPENV_PUSH level=%d at %s:%d\n", \
107 i, __FILE__, __LINE__);}) \
108 cur_env.je_prev = PL_top_env; \
110 cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \
112 PL_top_env = &cur_env; \
113 cur_env.je_mustcatch = FALSE; \
114 (v) = cur_env.je_ret; \
120 int i = -1; JMPENV *p = PL_top_env; \
121 while (p) { i++; p = p->je_prev; } \
122 Perl_deb(aTHX_ "JUMPENV_POP level=%d at %s:%d\n", \
123 i, __FILE__, __LINE__);}) \
124 assert(PL_top_env == &cur_env); \
125 PL_top_env = cur_env.je_prev; \
128 #define JMPENV_JUMP(v) \
131 int i = -1; JMPENV *p = PL_top_env; \
132 while (p) { i++; p = p->je_prev; } \
133 Perl_deb(aTHX_ "JUMPENV_JUMP(%d) level=%d at %s:%d\n", \
134 (int)v, i, __FILE__, __LINE__);}) \
136 if (PL_top_env->je_prev) \
137 PerlProc_longjmp(PL_top_env->je_buf, (v)); \
139 PerlProc_exit(STATUS_EXIT); \
140 PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \
144 #define CATCH_GET (PL_top_env->je_mustcatch)
145 #define CATCH_SET(v) \
149 "JUMPLEVEL set catch %d => %d (for %p) at %s:%d\n", \
150 PL_top_env->je_mustcatch, v, (void*)PL_top_env, \
151 __FILE__, __LINE__);) \
152 PL_top_env->je_mustcatch = (v); \
156 =head1 COP Hint Hashes
159 typedef struct refcounted_he COPHH;
161 #define COPHH_KEY_UTF8 REFCOUNTED_HE_KEY_UTF8
164 =for apidoc Amx|SV *|cophh_fetch_pvn|const COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|U32 flags
166 Look up the entry in the cop hints hash I<cophh> with the key specified by
167 I<keypv> and I<keylen>. If I<flags> has the C<COPHH_KEY_UTF8> bit set,
168 the key octets are interpreted as UTF-8, otherwise they are interpreted
169 as Latin-1. I<hash> is a precomputed hash of the key string, or zero if
170 it has not been precomputed. Returns a mortal scalar copy of the value
171 associated with the key, or C<&PL_sv_placeholder> if there is no value
172 associated with the key.
177 #define cophh_fetch_pvn(cophh, keypv, keylen, hash, flags) \
178 Perl_refcounted_he_fetch_pvn(aTHX_ cophh, keypv, keylen, hash, flags)
181 =for apidoc Amx|SV *|cophh_fetch_pvs|const COPHH *cophh|const char *key|U32 flags
183 Like L</cophh_fetch_pvn>, but takes a literal string instead of a
184 string/length pair, and no precomputed hash.
189 #define cophh_fetch_pvs(cophh, key, flags) \
190 Perl_refcounted_he_fetch_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, flags)
193 =for apidoc Amx|SV *|cophh_fetch_pv|const COPHH *cophh|const char *key|U32 hash|U32 flags
195 Like L</cophh_fetch_pvn>, but takes a nul-terminated string instead of
196 a string/length pair.
201 #define cophh_fetch_pv(cophh, key, hash, flags) \
202 Perl_refcounted_he_fetch_pv(aTHX_ cophh, key, hash, flags)
205 =for apidoc Amx|SV *|cophh_fetch_sv|const COPHH *cophh|SV *key|U32 hash|U32 flags
207 Like L</cophh_fetch_pvn>, but takes a Perl scalar instead of a
213 #define cophh_fetch_sv(cophh, key, hash, flags) \
214 Perl_refcounted_he_fetch_sv(aTHX_ cophh, key, hash, flags)
217 =for apidoc Amx|HV *|cophh_2hv|const COPHH *cophh|U32 flags
219 Generates and returns a standard Perl hash representing the full set of
220 key/value pairs in the cop hints hash I<cophh>. I<flags> is currently
221 unused and must be zero.
226 #define cophh_2hv(cophh, flags) \
227 Perl_refcounted_he_chain_2hv(aTHX_ cophh, flags)
230 =for apidoc Amx|COPHH *|cophh_copy|COPHH *cophh
232 Make and return a complete copy of the cop hints hash I<cophh>.
237 #define cophh_copy(cophh) Perl_refcounted_he_inc(aTHX_ cophh)
240 =for apidoc Amx|void|cophh_free|COPHH *cophh
242 Discard the cop hints hash I<cophh>, freeing all resources associated
248 #define cophh_free(cophh) Perl_refcounted_he_free(aTHX_ cophh)
251 =for apidoc Amx|COPHH *|cophh_new_empty
253 Generate and return a fresh cop hints hash containing no entries.
258 #define cophh_new_empty() ((COPHH *)NULL)
261 =for apidoc Amx|COPHH *|cophh_store_pvn|COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|SV *value|U32 flags
263 Stores a value, associated with a key, in the cop hints hash I<cophh>,
264 and returns the modified hash. The returned hash pointer is in general
265 not the same as the hash pointer that was passed in. The input hash is
266 consumed by the function, and the pointer to it must not be subsequently
267 used. Use L</cophh_copy> if you need both hashes.
269 The key is specified by I<keypv> and I<keylen>. If I<flags> has the
270 C<COPHH_KEY_UTF8> bit set, the key octets are interpreted as UTF-8,
271 otherwise they are interpreted as Latin-1. I<hash> is a precomputed
272 hash of the key string, or zero if it has not been precomputed.
274 I<value> is the scalar value to store for this key. I<value> is copied
275 by this function, which thus does not take ownership of any reference
276 to it, and later changes to the scalar will not be reflected in the
277 value visible in the cop hints hash. Complex types of scalar will not
278 be stored with referential integrity, but will be coerced to strings.
283 #define cophh_store_pvn(cophh, keypv, keylen, hash, value, flags) \
284 Perl_refcounted_he_new_pvn(aTHX_ cophh, keypv, keylen, hash, value, flags)
287 =for apidoc Amx|COPHH *|cophh_store_pvs|const COPHH *cophh|const char *key|SV *value|U32 flags
289 Like L</cophh_store_pvn>, but takes a literal string instead of a
290 string/length pair, and no precomputed hash.
295 #define cophh_store_pvs(cophh, key, value, flags) \
296 Perl_refcounted_he_new_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, value, flags)
299 =for apidoc Amx|COPHH *|cophh_store_pv|const COPHH *cophh|const char *key|U32 hash|SV *value|U32 flags
301 Like L</cophh_store_pvn>, but takes a nul-terminated string instead of
302 a string/length pair.
307 #define cophh_store_pv(cophh, key, hash, value, flags) \
308 Perl_refcounted_he_new_pv(aTHX_ cophh, key, hash, value, flags)
311 =for apidoc Amx|COPHH *|cophh_store_sv|const COPHH *cophh|SV *key|U32 hash|SV *value|U32 flags
313 Like L</cophh_store_pvn>, but takes a Perl scalar instead of a
319 #define cophh_store_sv(cophh, key, hash, value, flags) \
320 Perl_refcounted_he_new_sv(aTHX_ cophh, key, hash, value, flags)
323 =for apidoc Amx|COPHH *|cophh_delete_pvn|COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|U32 flags
325 Delete a key and its associated value from the cop hints hash I<cophh>,
326 and returns the modified hash. The returned hash pointer is in general
327 not the same as the hash pointer that was passed in. The input hash is
328 consumed by the function, and the pointer to it must not be subsequently
329 used. Use L</cophh_copy> if you need both hashes.
331 The key is specified by I<keypv> and I<keylen>. If I<flags> has the
332 C<COPHH_KEY_UTF8> bit set, the key octets are interpreted as UTF-8,
333 otherwise they are interpreted as Latin-1. I<hash> is a precomputed
334 hash of the key string, or zero if it has not been precomputed.
339 #define cophh_delete_pvn(cophh, keypv, keylen, hash, flags) \
340 Perl_refcounted_he_new_pvn(aTHX_ cophh, keypv, keylen, hash, \
344 =for apidoc Amx|COPHH *|cophh_delete_pvs|const COPHH *cophh|const char *key|U32 flags
346 Like L</cophh_delete_pvn>, but takes a literal string instead of a
347 string/length pair, and no precomputed hash.
352 #define cophh_delete_pvs(cophh, key, flags) \
353 Perl_refcounted_he_new_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, \
357 =for apidoc Amx|COPHH *|cophh_delete_pv|const COPHH *cophh|const char *key|U32 hash|U32 flags
359 Like L</cophh_delete_pvn>, but takes a nul-terminated string instead of
360 a string/length pair.
365 #define cophh_delete_pv(cophh, key, hash, flags) \
366 Perl_refcounted_he_new_pv(aTHX_ cophh, key, hash, (SV *)NULL, flags)
369 =for apidoc Amx|COPHH *|cophh_delete_sv|const COPHH *cophh|SV *key|U32 hash|U32 flags
371 Like L</cophh_delete_pvn>, but takes a Perl scalar instead of a
377 #define cophh_delete_sv(cophh, key, hash, flags) \
378 Perl_refcounted_he_new_sv(aTHX_ cophh, key, hash, (SV *)NULL, flags)
380 #include "mydtrace.h"
384 /* On LP64 putting this here takes advantage of the fact that BASEOP isn't
385 an exact multiple of 8 bytes to save structure padding. */
386 line_t cop_line; /* line # of this command */
387 /* label for this construct is now stored in cop_hints_hash */
389 char * cop_stashpv; /* package line was compiled in */
390 char * cop_file; /* file name the following line # is from */
392 HV * cop_stash; /* package line was compiled in */
393 GV * cop_filegv; /* file the following line # is from */
395 U32 cop_hints; /* hints bits from pragmata */
396 U32 cop_seq; /* parse sequence number */
397 /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *: */
398 STRLEN * cop_warnings; /* lexical warnings bitmask */
399 /* compile time state of %^H. See the comment in op.c for how this is
400 used to recreate a hash to return from caller. */
401 COPHH * cop_hints_hash;
405 # define CopFILE(c) ((c)->cop_file)
406 # define CopFILEGV(c) (CopFILE(c) \
407 ? gv_fetchfile(CopFILE(c)) : NULL)
410 # define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv))
411 # define CopFILE_setn(c,pv,l) ((c)->cop_file = savepv((pv),(l)))
413 # define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv))
414 # define CopFILE_setn(c,pv,l) ((c)->cop_file = savesharedpvn((pv),(l)))
417 # define CopFILESV(c) (CopFILE(c) \
418 ? GvSV(gv_fetchfile(CopFILE(c))) : NULL)
419 # define CopFILEAV(c) (CopFILE(c) \
420 ? GvAV(gv_fetchfile(CopFILE(c))) : NULL)
422 # define CopFILEAVx(c) (assert(CopFILE(c)), \
423 GvAV(gv_fetchfile(CopFILE(c))))
425 # define CopFILEAVx(c) (GvAV(gv_fetchfile(CopFILE(c))))
427 # define CopSTASHPV(c) ((c)->cop_stashpv)
430 # define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : NULL))
432 # define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv))
435 # define CopSTASH(c) (CopSTASHPV(c) \
436 ? gv_stashpv(CopSTASHPV(c),GV_ADD) : NULL)
437 # define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME_get(hv) : NULL)
438 # define CopSTASH_eq(c,hv) ((hv) && stashpv_hvname_match(c,hv))
440 # define CopSTASH_free(c) SAVECOPSTASH_FREE(c)
441 # define CopFILE_free(c) SAVECOPFILE_FREE(c)
443 # define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c))
444 # define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
447 # define CopFILEGV(c) ((c)->cop_filegv)
448 # define CopFILEGV_set(c,gv) ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv))
449 # define CopFILE_set(c,pv) CopFILEGV_set((c), gv_fetchfile(pv))
450 # define CopFILE_setn(c,pv,l) CopFILEGV_set((c), gv_fetchfile_flags((pv),(l),0))
451 # define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL)
452 # define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL)
454 # define CopFILEAVx(c) (assert(CopFILEGV(c)), GvAV(CopFILEGV(c)))
456 # define CopFILEAVx(c) (GvAV(CopFILEGV(c)))
458 # define CopFILE(c) (CopFILEGV(c) && GvSV(CopFILEGV(c)) \
459 ? SvPVX(GvSV(CopFILEGV(c))) : NULL)
460 # define CopSTASH(c) ((c)->cop_stash)
461 # define CopSTASH_set(c,hv) ((c)->cop_stash = (hv))
462 # define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
463 /* cop_stash is not refcounted */
464 # define CopSTASHPV_set(c,pv) CopSTASH_set((c), gv_stashpv(pv,GV_ADD))
465 # define CopSTASH_eq(c,hv) (CopSTASH(c) == (hv))
466 # define CopSTASH_free(c)
467 # define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))
469 #endif /* USE_ITHREADS */
471 #define CopHINTHASH_get(c) ((COPHH*)((c)->cop_hints_hash))
472 #define CopHINTHASH_set(c,h) ((c)->cop_hints_hash = (h))
475 =head1 COP Hint Reading
479 =for apidoc Am|SV *|cop_hints_fetch_pvn|const COP *cop|const char *keypv|STRLEN keylen|U32 hash|U32 flags
481 Look up the hint entry in the cop I<cop> with the key specified by
482 I<keypv> and I<keylen>. If I<flags> has the C<COPHH_KEY_UTF8> bit set,
483 the key octets are interpreted as UTF-8, otherwise they are interpreted
484 as Latin-1. I<hash> is a precomputed hash of the key string, or zero if
485 it has not been precomputed. Returns a mortal scalar copy of the value
486 associated with the key, or C<&PL_sv_placeholder> if there is no value
487 associated with the key.
492 #define cop_hints_fetch_pvn(cop, keypv, keylen, hash, flags) \
493 cophh_fetch_pvn(CopHINTHASH_get(cop), keypv, keylen, hash, flags)
496 =for apidoc Am|SV *|cop_hints_fetch_pvs|const COP *cop|const char *key|U32 flags
498 Like L</cop_hints_fetch_pvn>, but takes a literal string instead of a
499 string/length pair, and no precomputed hash.
504 #define cop_hints_fetch_pvs(cop, key, flags) \
505 cophh_fetch_pvs(CopHINTHASH_get(cop), key, flags)
508 =for apidoc Am|SV *|cop_hints_fetch_pv|const COP *cop|const char *key|U32 hash|U32 flags
510 Like L</cop_hints_fetch_pvn>, but takes a nul-terminated string instead
511 of a string/length pair.
516 #define cop_hints_fetch_pv(cop, key, hash, flags) \
517 cophh_fetch_pv(CopHINTHASH_get(cop), key, hash, flags)
520 =for apidoc Am|SV *|cop_hints_fetch_sv|const COP *cop|SV *key|U32 hash|U32 flags
522 Like L</cop_hints_fetch_pvn>, but takes a Perl scalar instead of a
528 #define cop_hints_fetch_sv(cop, key, hash, flags) \
529 cophh_fetch_sv(CopHINTHASH_get(cop), key, hash, flags)
532 =for apidoc Am|HV *|cop_hints_2hv|const COP *cop|U32 flags
534 Generates and returns a standard Perl hash representing the full set of
535 hint entries in the cop I<cop>. I<flags> is currently unused and must
541 #define cop_hints_2hv(cop, flags) \
542 cophh_2hv(CopHINTHASH_get(cop), flags)
544 #define CopLABEL(c) Perl_fetch_cop_label(aTHX_ (c), NULL, NULL)
545 #define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)
547 #define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv))
548 #define CopLINE(c) ((c)->cop_line)
549 #define CopLINE_inc(c) (++CopLINE(c))
550 #define CopLINE_dec(c) (--CopLINE(c))
551 #define CopLINE_set(c,l) (CopLINE(c) = (l))
553 /* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */
554 #define OutCopFILE(c) CopFILE(c)
556 /* If $[ is non-zero, it's stored in cop_hints under the key "$[", and
557 HINT_ARYBASE is set to indicate this.
558 Setting it is ineficient due to the need to create 2 mortal SVs, but as
559 using $[ is highly discouraged, no sane Perl code will be using it. */
560 #define CopARYBASE_get(c) \
561 ((CopHINTS_get(c) & HINT_ARYBASE) \
562 ? SvIV(cop_hints_fetch_pvs((c), "$[", 0)) \
564 #define CopARYBASE_set(c, b) STMT_START { \
565 if (b || ((c)->cop_hints & HINT_ARYBASE)) { \
566 (c)->cop_hints |= HINT_ARYBASE; \
567 if ((c) == &PL_compiling) { \
568 SV *val = newSViv(b); \
569 (void)hv_stores(GvHV(PL_hintgv), "$[", val); \
571 PL_hints |= HINT_ARYBASE; \
573 CopHINTHASH_set((c), \
574 cophh_store_pvs(CopHINTHASH_get((c)), "$[", \
575 sv_2mortal(newSViv(b)), 0)); \
580 /* FIXME NATIVE_HINTS if this is changed from op_private (see perl.h) */
581 #define CopHINTS_get(c) ((c)->cop_hints + 0)
582 #define CopHINTS_set(c, h) STMT_START { \
583 (c)->cop_hints = (h); \
587 * Here we have some enormously heavy (or at least ponderous) wizardry.
590 /* subroutine context */
592 OP * retop; /* op to execute on exit from sub */
593 /* Above here is the same for sub, format and eval. */
595 /* Above here is the same for sub and format. */
604 struct block_format {
605 OP * retop; /* op to execute on exit from sub */
606 /* Above here is the same for sub, format and eval. */
608 /* Above here is the same for sub and format. */
613 /* base for the next two macros. Don't use directly.
614 * Note that the refcnt of the cv is incremented twice; The CX one is
615 * decremented by LEAVESUB, the other by LEAVE. */
617 #define PUSHSUB_BASE(cx) \
618 ENTRY_PROBE(GvENAME(CvGV(cv)), \
619 CopFILE((const COP *)CvSTART(cv)), \
620 CopLINE((const COP *)CvSTART(cv))); \
622 cx->blk_sub.cv = cv; \
623 cx->blk_sub.olddepth = CvDEPTH(cv); \
624 cx->cx_type |= (hasargs) ? CXp_HASARGS : 0; \
625 cx->blk_sub.retop = NULL; \
626 if (!CvDEPTH(cv)) { \
627 SvREFCNT_inc_simple_void_NN(cv); \
628 SvREFCNT_inc_simple_void_NN(cv); \
633 #define PUSHSUB(cx) \
635 cx->blk_u16 = PL_op->op_private & \
636 (OPpLVAL_INTRO|OPpENTERSUB_INARGS);
638 /* variant for use by OP_DBSTATE, where op_private holds hint bits */
639 #define PUSHSUB_DB(cx) \
644 #define PUSHFORMAT(cx, retop) \
645 cx->blk_format.cv = cv; \
646 cx->blk_format.gv = gv; \
647 cx->blk_format.retop = (retop); \
648 cx->blk_format.dfoutgv = PL_defoutgv; \
649 SvREFCNT_inc_void(cx->blk_format.dfoutgv)
651 #define POP_SAVEARRAY() \
653 SvREFCNT_dec(GvAV(PL_defgv)); \
654 GvAV(PL_defgv) = cx->blk_sub.savearray; \
657 /* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
658 * leave any (a fast av_clear(ary), basically) */
659 #define CLEAR_ARGARRAY(ary) \
661 AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \
662 AvARRAY(ary) = AvALLOC(ary); \
666 #define POPSUB(cx,sv) \
668 RETURN_PROBE(GvENAME(CvGV((const CV*)cx->blk_sub.cv)), \
669 CopFILE((COP*)CvSTART((const CV*)cx->blk_sub.cv)), \
670 CopLINE((COP*)CvSTART((const CV*)cx->blk_sub.cv))); \
672 if (CxHASARGS(cx)) { \
674 /* abandon @_ if it got reified */ \
675 if (AvREAL(cx->blk_sub.argarray)) { \
676 const SSize_t fill = AvFILLp(cx->blk_sub.argarray); \
677 SvREFCNT_dec(cx->blk_sub.argarray); \
678 cx->blk_sub.argarray = newAV(); \
679 av_extend(cx->blk_sub.argarray, fill); \
680 AvREIFY_only(cx->blk_sub.argarray); \
681 CX_CURPAD_SV(cx->blk_sub, 0) = MUTABLE_SV(cx->blk_sub.argarray); \
684 CLEAR_ARGARRAY(cx->blk_sub.argarray); \
687 sv = MUTABLE_SV(cx->blk_sub.cv); \
688 if (sv && (CvDEPTH((const CV*)sv) = cx->blk_sub.olddepth)) \
692 #define LEAVESUB(sv) \
698 #define POPFORMAT(cx) \
699 setdefout(cx->blk_format.dfoutgv); \
700 SvREFCNT_dec(cx->blk_format.dfoutgv);
704 OP * retop; /* op to execute on exit from eval */
705 /* Above here is the same for sub, format and eval. */
710 JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
713 /* If we ever need more than 512 op types, change the shift from 7.
714 blku_gimme is actually also only 2 bits, so could be merged with something.
717 #define CxOLD_IN_EVAL(cx) (((cx)->blk_u16) & 0x7F)
718 #define CxOLD_OP_TYPE(cx) (((cx)->blk_u16) >> 7)
720 #define PUSHEVAL(cx,n) \
722 assert(!(PL_in_eval & ~0x7F)); \
723 assert(!(PL_op->op_type & ~0x1FF)); \
724 cx->blk_u16 = (PL_in_eval & 0x7F) | ((U16)PL_op->op_type << 7); \
725 cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL); \
726 cx->blk_eval.old_eval_root = PL_eval_root; \
727 cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL; \
728 cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */ \
729 cx->blk_eval.retop = NULL; \
730 cx->blk_eval.cur_top_env = PL_top_env; \
733 #define POPEVAL(cx) \
735 PL_in_eval = CxOLD_IN_EVAL(cx); \
736 optype = CxOLD_OP_TYPE(cx); \
737 PL_eval_root = cx->blk_eval.old_eval_root; \
738 if (cx->blk_eval.old_namesv) \
739 sv_2mortal(cx->blk_eval.old_namesv); \
745 LOOP * my_op; /* My op, that contains redo, next and last ops. */
746 union { /* different ways of locating the iteration variable */
749 PAD *oldcomppad; /* only used in ITHREADS */
752 struct { /* valid if type is LOOP_FOR or LOOP_PLAIN (but {NULL,0})*/
753 AV * ary; /* use the stack if this is NULL */
756 struct { /* valid if type is LOOP_LAZYIV */
760 struct { /* valid if type if LOOP_LAZYSV */
762 SV * end; /* maxiumum value (or minimum in reverse) */
768 # define CxITERVAR_PADSV(c) \
769 &CX_CURPAD_SV( (c)->blk_loop.itervar_u, (c)->blk_loop.my_op->op_targ)
771 # define CxITERVAR_PADSV(c) ((c)->blk_loop.itervar_u.svp)
774 #define CxITERVAR(c) \
775 ((c)->blk_loop.itervar_u.oldcomppad \
777 ? CxITERVAR_PADSV(c) \
778 : &GvSV((c)->blk_loop.itervar_u.gv)) \
781 #define CxLABEL(c) (0 + CopLABEL((c)->blk_oldcop))
782 #define CxHASARGS(c) (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
783 #define CxLVAL(c) (0 + (c)->blk_u16)
785 #define PUSHLOOP_PLAIN(cx, s) \
786 cx->blk_loop.resetsp = s - PL_stack_base; \
787 cx->blk_loop.my_op = cLOOP; \
788 cx->blk_loop.state_u.ary.ary = NULL; \
789 cx->blk_loop.state_u.ary.ix = 0; \
790 cx->blk_loop.itervar_u.svp = NULL;
792 #define PUSHLOOP_FOR(cx, ivar, s) \
793 cx->blk_loop.resetsp = s - PL_stack_base; \
794 cx->blk_loop.my_op = cLOOP; \
795 cx->blk_loop.state_u.ary.ary = NULL; \
796 cx->blk_loop.state_u.ary.ix = 0; \
797 cx->blk_loop.itervar_u.svp = (SV**)(ivar);
799 #define POPLOOP(cx) \
800 if (CxTYPE(cx) == CXt_LOOP_LAZYSV) { \
801 SvREFCNT_dec(cx->blk_loop.state_u.lazysv.cur); \
802 SvREFCNT_dec(cx->blk_loop.state_u.lazysv.end); \
804 if (CxTYPE(cx) == CXt_LOOP_FOR) \
805 SvREFCNT_dec(cx->blk_loop.state_u.ary.ary);
807 /* given/when context */
808 struct block_givwhen {
812 #define PUSHGIVEN(cx) \
813 cx->blk_givwhen.leave_op = cLOGOP->op_other;
815 #define PUSHWHEN PUSHGIVEN
817 /* context common to subroutines, evals and loops */
819 U8 blku_type; /* what kind of context this is */
820 U8 blku_gimme; /* is this block running in list context? */
821 U16 blku_u16; /* used by block_sub and block_eval (so far) */
822 I32 blku_oldsp; /* stack pointer to copy stuff down to */
823 COP * blku_oldcop; /* old curcop pointer */
824 I32 blku_oldmarksp; /* mark stack index */
825 I32 blku_oldscopesp; /* scope stack index */
826 PMOP * blku_oldpm; /* values of pattern match vars */
829 struct block_sub blku_sub;
830 struct block_format blku_format;
831 struct block_eval blku_eval;
832 struct block_loop blku_loop;
833 struct block_givwhen blku_givwhen;
836 #define blk_oldsp cx_u.cx_blk.blku_oldsp
837 #define blk_oldcop cx_u.cx_blk.blku_oldcop
838 #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
839 #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
840 #define blk_oldpm cx_u.cx_blk.blku_oldpm
841 #define blk_gimme cx_u.cx_blk.blku_gimme
842 #define blk_u16 cx_u.cx_blk.blku_u16
843 #define blk_sub cx_u.cx_blk.blk_u.blku_sub
844 #define blk_format cx_u.cx_blk.blk_u.blku_format
845 #define blk_eval cx_u.cx_blk.blk_u.blku_eval
846 #define blk_loop cx_u.cx_blk.blk_u.blku_loop
847 #define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen
849 #define DEBUG_CX(action) \
851 Perl_deb(aTHX_ "CX %ld %s %s (scope %ld,%ld) at %s:%d\n", \
854 PL_block_type[CxTYPE(&cxstack[cxstack_ix])], \
855 (long)PL_scopestack_ix, \
856 (long)(cxstack[cxstack_ix].blk_oldscopesp), \
857 __FILE__, __LINE__));
860 #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
862 cx->blk_oldsp = sp - PL_stack_base, \
863 cx->blk_oldcop = PL_curcop, \
864 cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
865 cx->blk_oldscopesp = PL_scopestack_ix, \
866 cx->blk_oldpm = PL_curpm, \
867 cx->blk_gimme = (U8)gimme; \
870 /* Exit a block (RETURN and LAST). */
871 #define POPBLOCK(cx,pm) \
873 cx = &cxstack[cxstack_ix--], \
874 newsp = PL_stack_base + cx->blk_oldsp, \
875 PL_curcop = cx->blk_oldcop, \
876 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
877 PL_scopestack_ix = cx->blk_oldscopesp, \
878 pm = cx->blk_oldpm, \
879 gimme = cx->blk_gimme;
881 /* Continue a block elsewhere (NEXT and REDO). */
882 #define TOPBLOCK(cx) \
884 cx = &cxstack[cxstack_ix], \
885 PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
886 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
887 PL_scopestack_ix = cx->blk_oldscopesp, \
888 PL_curpm = cx->blk_oldpm;
890 /* substitution context */
892 U8 sbu_type; /* what kind of context this is */
894 U16 sbu_rxtainted; /* matches struct block */
907 #define sb_iters cx_u.cx_subst.sbu_iters
908 #define sb_maxiters cx_u.cx_subst.sbu_maxiters
909 #define sb_rflags cx_u.cx_subst.sbu_rflags
910 #define sb_oldsave cx_u.cx_subst.sbu_oldsave
911 #define sb_once cx_u.cx_subst.sbu_once
912 #define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
913 #define sb_orig cx_u.cx_subst.sbu_orig
914 #define sb_dstr cx_u.cx_subst.sbu_dstr
915 #define sb_targ cx_u.cx_subst.sbu_targ
916 #define sb_s cx_u.cx_subst.sbu_s
917 #define sb_m cx_u.cx_subst.sbu_m
918 #define sb_strend cx_u.cx_subst.sbu_strend
919 #define sb_rxres cx_u.cx_subst.sbu_rxres
920 #define sb_rx cx_u.cx_subst.sbu_rx
923 # define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
924 cx->sb_iters = iters, \
925 cx->sb_maxiters = maxiters, \
926 cx->sb_rflags = r_flags, \
927 cx->sb_oldsave = oldsave, \
928 cx->sb_rxtainted = rxtainted, \
929 cx->sb_orig = orig, \
930 cx->sb_dstr = dstr, \
931 cx->sb_targ = targ, \
934 cx->sb_strend = strend, \
935 cx->sb_rxres = NULL, \
937 cx->cx_type = CXt_SUBST | (once ? CXp_ONCE : 0); \
938 rxres_save(&cx->sb_rxres, rx); \
939 (void)ReREFCNT_inc(rx)
941 # define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
942 rxres_free(&cx->sb_rxres); \
943 ReREFCNT_dec(cx->sb_rx)
946 #define CxONCE(cx) ((cx)->cx_type & CXp_ONCE)
951 struct subst cx_subst;
954 #define cx_type cx_u.cx_subst.sbu_type
956 /* If you re-order these, there is also an array of uppercase names in perl.h
957 and a static array of context names in pp_ctl.c */
958 #define CXTYPEMASK 0xf
962 /* When micro-optimising :-) keep GIVEN next to the LOOPs, as these 5 share a
963 jump table in pp_ctl.c
964 The first 4 don't have a 'case' in at least one switch statement in pp_ctl.c
967 /* This is first so that CXt_LOOP_FOR|CXt_LOOP_LAZYIV is CXt_LOOP_LAZYIV */
968 #define CXt_LOOP_FOR 4
969 #define CXt_LOOP_PLAIN 5
970 #define CXt_LOOP_LAZYSV 6
971 #define CXt_LOOP_LAZYIV 7
976 /* SUBST doesn't feature in all switch statements. */
978 /* private flags for CXt_SUB and CXt_NULL
979 However, this is checked in many places which do not check the type, so
980 this bit needs to be kept clear for most everything else. For reasons I
981 haven't investigated, it can coexist with CXp_FOR_DEF */
982 #define CXp_MULTICALL 0x10 /* part of a multicall (so don't
983 tear down context on exit). */
985 /* private flags for CXt_SUB and CXt_FORMAT */
986 #define CXp_HASARGS 0x20
988 /* private flags for CXt_EVAL */
989 #define CXp_REAL 0x20 /* truly eval'', not a lookalike */
990 #define CXp_TRYBLOCK 0x40 /* eval{}, not eval'' or similar */
992 /* private flags for CXt_LOOP */
993 #define CXp_FOR_DEF 0x10 /* foreach using $_ */
994 #define CxPADLOOP(c) ((c)->blk_loop.my_op->op_targ)
996 /* private flags for CXt_SUBST */
997 #define CXp_ONCE 0x10 /* What was sbu_once in struct subst */
999 #define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
1000 #define CxTYPE_is_LOOP(c) (((c)->cx_type & 0xC) == 0x4)
1001 #define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
1003 #define CxREALEVAL(c) (((c)->cx_type & (CXTYPEMASK|CXp_REAL)) \
1004 == (CXt_EVAL|CXp_REAL))
1005 #define CxTRYBLOCK(c) (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK)) \
1006 == (CXt_EVAL|CXp_TRYBLOCK))
1007 #define CxFOREACH(c) (CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN)
1008 #define CxFOREACHDEF(c) ((CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN) \
1009 && ((c)->cx_type & CXp_FOR_DEF))
1011 #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
1014 =head1 "Gimme" Values
1018 =for apidoc AmU||G_SCALAR
1019 Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and
1022 =for apidoc AmU||G_ARRAY
1023 Used to indicate list context. See C<GIMME_V>, C<GIMME> and
1026 =for apidoc AmU||G_VOID
1027 Used to indicate void context. See C<GIMME_V> and L<perlcall>.
1029 =for apidoc AmU||G_DISCARD
1030 Indicates that arguments returned from a callback should be discarded. See
1033 =for apidoc AmU||G_EVAL
1035 Used to force a Perl C<eval> wrapper around a callback. See
1038 =for apidoc AmU||G_NOARGS
1040 Indicates that no arguments are being sent to a callback. See
1051 /* extra flags for Perl_call_* routines */
1052 #define G_DISCARD 4 /* Call FREETMPS.
1053 Don't change this without consulting the
1054 hash actions codes defined in hv.h */
1055 #define G_EVAL 8 /* Assume eval {} around subroutine call. */
1056 #define G_NOARGS 16 /* Don't construct a @_ array. */
1057 #define G_KEEPERR 32 /* Warn for errors, don't overwrite $@ */
1058 #define G_NODEBUG 64 /* Disable debugging at toplevel. */
1059 #define G_METHOD 128 /* Calling method. */
1060 #define G_FAKINGEVAL 256 /* Faking an eval context for call_sv or
1062 #define G_UNDEF_FILL 512 /* Fill the stack with &PL_sv_undef
1063 A special case for UNSHIFT in
1064 Perl_magic_methcall(). */
1066 /* flag bits for PL_in_eval */
1067 #define EVAL_NULL 0 /* not in an eval */
1068 #define EVAL_INEVAL 1 /* some enclosing scope is an eval */
1069 #define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
1070 #define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
1071 #define EVAL_INREQUIRE 8 /* The code is being required. */
1073 /* Support for switching (stack and block) contexts.
1074 * This ensures magic doesn't invalidate local stack and cx pointers.
1077 #define PERLSI_UNKNOWN -1
1078 #define PERLSI_UNDEF 0
1079 #define PERLSI_MAIN 1
1080 #define PERLSI_MAGIC 2
1081 #define PERLSI_SORT 3
1082 #define PERLSI_SIGNAL 4
1083 #define PERLSI_OVERLOAD 5
1084 #define PERLSI_DESTROY 6
1085 #define PERLSI_WARNHOOK 7
1086 #define PERLSI_DIEHOOK 8
1087 #define PERLSI_REQUIRE 9
1090 AV * si_stack; /* stack for current runlevel */
1091 PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
1092 struct stackinfo * si_prev;
1093 struct stackinfo * si_next;
1094 I32 si_cxix; /* current context index */
1095 I32 si_cxmax; /* maximum allocated index */
1096 I32 si_type; /* type of runlevel */
1097 I32 si_markoff; /* offset where markstack begins for us.
1098 * currently used only with DEBUGGING,
1099 * but not #ifdef-ed for bincompat */
1102 typedef struct stackinfo PERL_SI;
1104 #define cxstack (PL_curstackinfo->si_cxstack)
1105 #define cxstack_ix (PL_curstackinfo->si_cxix)
1106 #define cxstack_max (PL_curstackinfo->si_cxmax)
1109 # define SET_MARK_OFFSET \
1110 PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
1112 # define SET_MARK_OFFSET NOOP
1115 #define PUSHSTACKi(type) \
1117 PERL_SI *next = PL_curstackinfo->si_next; \
1119 int i = 0; PERL_SI *p = PL_curstackinfo; \
1120 while (p) { i++; p = p->si_prev; } \
1121 Perl_deb(aTHX_ "push STACKINFO %d at %s:%d\n", \
1122 i, __FILE__, __LINE__);}) \
1124 next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
1125 next->si_prev = PL_curstackinfo; \
1126 PL_curstackinfo->si_next = next; \
1128 next->si_type = type; \
1129 next->si_cxix = -1; \
1130 AvFILLp(next->si_stack) = 0; \
1131 SWITCHSTACK(PL_curstack,next->si_stack); \
1132 PL_curstackinfo = next; \
1136 #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
1138 /* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
1139 * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
1143 PERL_SI * const prev = PL_curstackinfo->si_prev; \
1145 int i = -1; PERL_SI *p = PL_curstackinfo; \
1146 while (p) { i++; p = p->si_prev; } \
1147 Perl_deb(aTHX_ "pop STACKINFO %d at %s:%d\n", \
1148 i, __FILE__, __LINE__);}) \
1150 PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \
1153 SWITCHSTACK(PL_curstack,prev->si_stack); \
1154 /* don't free prev here, free them all at the END{} */ \
1155 PL_curstackinfo = prev; \
1158 #define POPSTACK_TO(s) \
1160 while (PL_curstack != s) { \
1166 #define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
1167 #define IN_PERL_RUNTIME (PL_curcop != &PL_compiling)
1170 =head1 Multicall Functions
1172 =for apidoc Ams||dMULTICALL
1173 Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>.
1175 =for apidoc Ams||PUSH_MULTICALL
1176 Opening bracket for a lightweight callback.
1177 See L<perlcall/Lightweight Callbacks>.
1179 =for apidoc Ams||MULTICALL
1180 Make a lightweight callback. See L<perlcall/Lightweight Callbacks>.
1182 =for apidoc Ams||POP_MULTICALL
1183 Closing bracket for a lightweight callback.
1184 See L<perlcall/Lightweight Callbacks>.
1189 #define dMULTICALL \
1190 SV **newsp; /* set by POPBLOCK */ \
1193 OP *multicall_cop; \
1194 bool multicall_oldcatch; \
1195 U8 hasargs = 0 /* used by PUSHSUB */
1197 #define PUSH_MULTICALL(the_cv) \
1199 CV * const _nOnclAshIngNamE_ = the_cv; \
1200 CV * const cv = _nOnclAshIngNamE_; \
1201 AV * const padlist = CvPADLIST(cv); \
1203 multicall_oldcatch = CATCH_GET; \
1204 SAVETMPS; SAVEVPTR(PL_op); \
1206 PUSHSTACKi(PERLSI_SORT); \
1207 PUSHBLOCK(cx, CXt_SUB|CXp_MULTICALL, PL_stack_sp); \
1209 if (++CvDEPTH(cv) >= 2) { \
1210 PERL_STACK_OVERFLOW_CHECK(); \
1211 Perl_pad_push(aTHX_ padlist, CvDEPTH(cv)); \
1214 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv)); \
1215 multicall_cv = cv; \
1216 multicall_cop = CvSTART(cv); \
1221 PL_op = multicall_cop; \
1225 #define POP_MULTICALL \
1227 if (! --CvDEPTH(multicall_cv)) \
1228 LEAVESUB(multicall_cv); \
1229 POPBLOCK(cx,PL_curpm); \
1231 CATCH_SET(multicall_oldcatch); \
1238 * c-indentation-style: bsd
1240 * indent-tabs-mode: t
1243 * ex: set ts=8 sts=4 sw=4 noet: