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[perl5.git] / cop.h
1 /*    cop.h
2  *
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
5  *
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.
8  *
9  * Control ops (cops) are one of the two ops OP_NEXTSTATE and OP_DBSTATE,
10  * that (loosely speaking) are statement separators.
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.
14  */
15
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
19  * non-null.
20  *
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).
24  *
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.
29  * GSAR 97-03-27
30  */
31
32 struct jmpenv {
33     struct jmpenv *     je_prev;
34     Sigjmp_buf          je_buf;         /* uninit if je_prev is NULL */
35     int                 je_ret;         /* last exception thrown */
36     bool                je_mustcatch;   /* need to call longjmp()? */
37     U16                 je_old_delaymagic; /* saved PL_delaymagic */
38 };
39
40 typedef struct jmpenv JMPENV;
41
42 /*
43  * How to build the first jmpenv.
44  *
45  * top_env needs to be non-zero. It points to an area
46  * in which longjmp() stuff is stored, as C callstack
47  * info there at least is thread specific this has to
48  * be per-thread. Otherwise a 'die' in a thread gives
49  * that thread the C stack of last thread to do an eval {}!
50  */
51
52 #define JMPENV_BOOTSTRAP \
53     STMT_START {                                \
54         PERL_POISON_EXPR(PoisonNew(&PL_start_env, 1, JMPENV));\
55         PL_top_env = &PL_start_env;             \
56         PL_start_env.je_prev = NULL;            \
57         PL_start_env.je_ret = -1;               \
58         PL_start_env.je_mustcatch = TRUE;       \
59         PL_start_env.je_old_delaymagic = 0;     \
60     } STMT_END
61
62 /*
63  *   PERL_FLEXIBLE_EXCEPTIONS
64  * 
65  * All the flexible exceptions code has been removed.
66  * See the following threads for details:
67  *
68  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-07/msg00378.html
69  * 
70  * Joshua's original patches (which weren't applied) and discussion:
71  * 
72  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01396.html
73  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01489.html
74  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01491.html
75  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01608.html
76  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02144.html
77  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02998.html
78  * 
79  * Chip's reworked patch and discussion:
80  * 
81  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1999-03/msg00520.html
82  * 
83  * The flaw in these patches (which went unnoticed at the time) was
84  * that they moved some code that could potentially die() out of the
85  * region protected by the setjmp()s.  This caused exceptions within
86  * END blocks and such to not be handled by the correct setjmp().
87  * 
88  * The original patches that introduces flexible exceptions were:
89  *
90  * http://perl5.git.perl.org/perl.git/commit/312caa8e97f1c7ee342a9895c2f0e749625b4929
91  * http://perl5.git.perl.org/perl.git/commit/14dd3ad8c9bf82cf09798a22cc89a9862dfd6d1a                                        
92  *  
93  */
94
95 #define dJMPENV         JMPENV cur_env
96
97 #define JMPENV_PUSH(v) \
98     STMT_START {                                                        \
99         DEBUG_l({                                                       \
100             int i = 0; JMPENV *p = PL_top_env;                          \
101             while (p) { i++; p = p->je_prev; }                          \
102             Perl_deb(aTHX_ "JUMPENV_PUSH level=%d at %s:%d\n",          \
103                          i,  __FILE__, __LINE__);})                     \
104         cur_env.je_prev = PL_top_env;                                   \
105         cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK);              \
106         PL_top_env = &cur_env;                                          \
107         cur_env.je_mustcatch = FALSE;                                   \
108         cur_env.je_old_delaymagic = PL_delaymagic;                      \
109         (v) = cur_env.je_ret;                                           \
110     } STMT_END
111
112 #define JMPENV_POP \
113     STMT_START {                                                        \
114         DEBUG_l({                                                       \
115             int i = -1; JMPENV *p = PL_top_env;                         \
116             while (p) { i++; p = p->je_prev; }                          \
117             Perl_deb(aTHX_ "JUMPENV_POP level=%d at %s:%d\n",           \
118                          i, __FILE__, __LINE__);})                      \
119         assert(PL_top_env == &cur_env);                                 \
120         PL_delaymagic = cur_env.je_old_delaymagic;                      \
121         PL_top_env = cur_env.je_prev;                                   \
122     } STMT_END
123
124 #define JMPENV_JUMP(v) \
125     STMT_START {                                                \
126         DEBUG_l({                                               \
127             int i = -1; JMPENV *p = PL_top_env;                 \
128             while (p) { i++; p = p->je_prev; }                  \
129             Perl_deb(aTHX_ "JUMPENV_JUMP(%d) level=%d at %s:%d\n", \
130                          (int)v, i, __FILE__, __LINE__);})      \
131         if (PL_top_env->je_prev)                                \
132             PerlProc_longjmp(PL_top_env->je_buf, (v));          \
133         if ((v) == 2)                                           \
134             PerlProc_exit(STATUS_EXIT);                         \
135         PerlIO_printf(PerlIO_stderr(), "panic: top_env, v=%d\n", (int)v); \
136         PerlProc_exit(1);                                       \
137     } STMT_END
138
139 #define CATCH_GET               (PL_top_env->je_mustcatch)
140 #define CATCH_SET(v) \
141     STMT_START {                                                        \
142         DEBUG_l(                                                        \
143             Perl_deb(aTHX_                                              \
144                 "JUMPLEVEL set catch %d => %d (for %p) at %s:%d\n",     \
145                  PL_top_env->je_mustcatch, v, (void*)PL_top_env,        \
146                  __FILE__, __LINE__);)                                  \
147         PL_top_env->je_mustcatch = (v);                                 \
148     } STMT_END
149
150 /*
151 =head1 COP Hint Hashes
152 */
153
154 typedef struct refcounted_he COPHH;
155
156 #define COPHH_KEY_UTF8 REFCOUNTED_HE_KEY_UTF8
157
158 /*
159 =for apidoc Amx|SV *|cophh_fetch_pvn|const COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|U32 flags
160
161 Look up the entry in the cop hints hash C<cophh> with the key specified by
162 C<keypv> and C<keylen>.  If C<flags> has the C<COPHH_KEY_UTF8> bit set,
163 the key octets are interpreted as UTF-8, otherwise they are interpreted
164 as Latin-1.  C<hash> is a precomputed hash of the key string, or zero if
165 it has not been precomputed.  Returns a mortal scalar copy of the value
166 associated with the key, or C<&PL_sv_placeholder> if there is no value
167 associated with the key.
168
169 =cut
170 */
171
172 #define cophh_fetch_pvn(cophh, keypv, keylen, hash, flags) \
173     Perl_refcounted_he_fetch_pvn(aTHX_ cophh, keypv, keylen, hash, flags)
174
175 /*
176 =for apidoc Amx|SV *|cophh_fetch_pvs|const COPHH *cophh|const char *key|U32 flags
177
178 Like L</cophh_fetch_pvn>, but takes a literal string instead of a
179 string/length pair, and no precomputed hash.
180
181 =cut
182 */
183
184 #define cophh_fetch_pvs(cophh, key, flags) \
185     Perl_refcounted_he_fetch_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, flags)
186
187 /*
188 =for apidoc Amx|SV *|cophh_fetch_pv|const COPHH *cophh|const char *key|U32 hash|U32 flags
189
190 Like L</cophh_fetch_pvn>, but takes a nul-terminated string instead of
191 a string/length pair.
192
193 =cut
194 */
195
196 #define cophh_fetch_pv(cophh, key, hash, flags) \
197     Perl_refcounted_he_fetch_pv(aTHX_ cophh, key, hash, flags)
198
199 /*
200 =for apidoc Amx|SV *|cophh_fetch_sv|const COPHH *cophh|SV *key|U32 hash|U32 flags
201
202 Like L</cophh_fetch_pvn>, but takes a Perl scalar instead of a
203 string/length pair.
204
205 =cut
206 */
207
208 #define cophh_fetch_sv(cophh, key, hash, flags) \
209     Perl_refcounted_he_fetch_sv(aTHX_ cophh, key, hash, flags)
210
211 /*
212 =for apidoc Amx|HV *|cophh_2hv|const COPHH *cophh|U32 flags
213
214 Generates and returns a standard Perl hash representing the full set of
215 key/value pairs in the cop hints hash C<cophh>.  C<flags> is currently
216 unused and must be zero.
217
218 =cut
219 */
220
221 #define cophh_2hv(cophh, flags) \
222     Perl_refcounted_he_chain_2hv(aTHX_ cophh, flags)
223
224 /*
225 =for apidoc Amx|COPHH *|cophh_copy|COPHH *cophh
226
227 Make and return a complete copy of the cop hints hash C<cophh>.
228
229 =cut
230 */
231
232 #define cophh_copy(cophh) Perl_refcounted_he_inc(aTHX_ cophh)
233
234 /*
235 =for apidoc Amx|void|cophh_free|COPHH *cophh
236
237 Discard the cop hints hash C<cophh>, freeing all resources associated
238 with it.
239
240 =cut
241 */
242
243 #define cophh_free(cophh) Perl_refcounted_he_free(aTHX_ cophh)
244
245 /*
246 =for apidoc Amx|COPHH *|cophh_new_empty
247
248 Generate and return a fresh cop hints hash containing no entries.
249
250 =cut
251 */
252
253 #define cophh_new_empty() ((COPHH *)NULL)
254
255 /*
256 =for apidoc Amx|COPHH *|cophh_store_pvn|COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|SV *value|U32 flags
257
258 Stores a value, associated with a key, in the cop hints hash C<cophh>,
259 and returns the modified hash.  The returned hash pointer is in general
260 not the same as the hash pointer that was passed in.  The input hash is
261 consumed by the function, and the pointer to it must not be subsequently
262 used.  Use L</cophh_copy> if you need both hashes.
263
264 The key is specified by C<keypv> and C<keylen>.  If C<flags> has the
265 C<COPHH_KEY_UTF8> bit set, the key octets are interpreted as UTF-8,
266 otherwise they are interpreted as Latin-1.  C<hash> is a precomputed
267 hash of the key string, or zero if it has not been precomputed.
268
269 C<value> is the scalar value to store for this key.  C<value> is copied
270 by this function, which thus does not take ownership of any reference
271 to it, and later changes to the scalar will not be reflected in the
272 value visible in the cop hints hash.  Complex types of scalar will not
273 be stored with referential integrity, but will be coerced to strings.
274
275 =cut
276 */
277
278 #define cophh_store_pvn(cophh, keypv, keylen, hash, value, flags) \
279     Perl_refcounted_he_new_pvn(aTHX_ cophh, keypv, keylen, hash, value, flags)
280
281 /*
282 =for apidoc Amx|COPHH *|cophh_store_pvs|const COPHH *cophh|const char *key|SV *value|U32 flags
283
284 Like L</cophh_store_pvn>, but takes a literal string instead of a
285 string/length pair, and no precomputed hash.
286
287 =cut
288 */
289
290 #define cophh_store_pvs(cophh, key, value, flags) \
291     Perl_refcounted_he_new_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, value, flags)
292
293 /*
294 =for apidoc Amx|COPHH *|cophh_store_pv|const COPHH *cophh|const char *key|U32 hash|SV *value|U32 flags
295
296 Like L</cophh_store_pvn>, but takes a nul-terminated string instead of
297 a string/length pair.
298
299 =cut
300 */
301
302 #define cophh_store_pv(cophh, key, hash, value, flags) \
303     Perl_refcounted_he_new_pv(aTHX_ cophh, key, hash, value, flags)
304
305 /*
306 =for apidoc Amx|COPHH *|cophh_store_sv|const COPHH *cophh|SV *key|U32 hash|SV *value|U32 flags
307
308 Like L</cophh_store_pvn>, but takes a Perl scalar instead of a
309 string/length pair.
310
311 =cut
312 */
313
314 #define cophh_store_sv(cophh, key, hash, value, flags) \
315     Perl_refcounted_he_new_sv(aTHX_ cophh, key, hash, value, flags)
316
317 /*
318 =for apidoc Amx|COPHH *|cophh_delete_pvn|COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|U32 flags
319
320 Delete a key and its associated value from the cop hints hash C<cophh>,
321 and returns the modified hash.  The returned hash pointer is in general
322 not the same as the hash pointer that was passed in.  The input hash is
323 consumed by the function, and the pointer to it must not be subsequently
324 used.  Use L</cophh_copy> if you need both hashes.
325
326 The key is specified by C<keypv> and C<keylen>.  If C<flags> has the
327 C<COPHH_KEY_UTF8> bit set, the key octets are interpreted as UTF-8,
328 otherwise they are interpreted as Latin-1.  C<hash> is a precomputed
329 hash of the key string, or zero if it has not been precomputed.
330
331 =cut
332 */
333
334 #define cophh_delete_pvn(cophh, keypv, keylen, hash, flags) \
335     Perl_refcounted_he_new_pvn(aTHX_ cophh, keypv, keylen, hash, \
336         (SV *)NULL, flags)
337
338 /*
339 =for apidoc Amx|COPHH *|cophh_delete_pvs|const COPHH *cophh|const char *key|U32 flags
340
341 Like L</cophh_delete_pvn>, but takes a literal string instead of a
342 string/length pair, and no precomputed hash.
343
344 =cut
345 */
346
347 #define cophh_delete_pvs(cophh, key, flags) \
348     Perl_refcounted_he_new_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, \
349         (SV *)NULL, flags)
350
351 /*
352 =for apidoc Amx|COPHH *|cophh_delete_pv|const COPHH *cophh|const char *key|U32 hash|U32 flags
353
354 Like L</cophh_delete_pvn>, but takes a nul-terminated string instead of
355 a string/length pair.
356
357 =cut
358 */
359
360 #define cophh_delete_pv(cophh, key, hash, flags) \
361     Perl_refcounted_he_new_pv(aTHX_ cophh, key, hash, (SV *)NULL, flags)
362
363 /*
364 =for apidoc Amx|COPHH *|cophh_delete_sv|const COPHH *cophh|SV *key|U32 hash|U32 flags
365
366 Like L</cophh_delete_pvn>, but takes a Perl scalar instead of a
367 string/length pair.
368
369 =cut
370 */
371
372 #define cophh_delete_sv(cophh, key, hash, flags) \
373     Perl_refcounted_he_new_sv(aTHX_ cophh, key, hash, (SV *)NULL, flags)
374
375 #include "mydtrace.h"
376
377 struct cop {
378     BASEOP
379     /* On LP64 putting this here takes advantage of the fact that BASEOP isn't
380        an exact multiple of 8 bytes to save structure padding.  */
381     line_t      cop_line;       /* line # of this command */
382     /* label for this construct is now stored in cop_hints_hash */
383 #ifdef USE_ITHREADS
384     PADOFFSET   cop_stashoff;   /* offset into PL_stashpad, for the
385                                    package the line was compiled in */
386     char *      cop_file;       /* file name the following line # is from */
387 #else
388     HV *        cop_stash;      /* package line was compiled in */
389     GV *        cop_filegv;     /* file the following line # is from */
390 #endif
391     U32         cop_hints;      /* hints bits from pragmata */
392     U32         cop_seq;        /* parse sequence number */
393     /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *:  */
394     STRLEN *    cop_warnings;   /* lexical warnings bitmask */
395     /* compile time state of %^H.  See the comment in op.c for how this is
396        used to recreate a hash to return from caller.  */
397     COPHH *     cop_hints_hash;
398 };
399
400 #ifdef USE_ITHREADS
401 #  define CopFILE(c)            ((c)->cop_file)
402 #  define CopFILEGV(c)          (CopFILE(c) \
403                                  ? gv_fetchfile(CopFILE(c)) : NULL)
404                                  
405 #  ifdef NETWARE
406 #    define CopFILE_set(c,pv)   ((c)->cop_file = savepv(pv))
407 #    define CopFILE_setn(c,pv,l)  ((c)->cop_file = savepvn((pv),(l)))
408 #  else
409 #    define CopFILE_set(c,pv)   ((c)->cop_file = savesharedpv(pv))
410 #    define CopFILE_setn(c,pv,l)  ((c)->cop_file = savesharedpvn((pv),(l)))
411 #  endif
412
413 #  define CopFILESV(c)          (CopFILE(c) \
414                                  ? GvSV(gv_fetchfile(CopFILE(c))) : NULL)
415 #  define CopFILEAV(c)          (CopFILE(c) \
416                                  ? GvAV(gv_fetchfile(CopFILE(c))) : NULL)
417 #  define CopFILEAVx(c)         (assert_(CopFILE(c)) \
418                                    GvAV(gv_fetchfile(CopFILE(c))))
419
420 #  define CopSTASH(c)           PL_stashpad[(c)->cop_stashoff]
421 #  define CopSTASH_set(c,hv)    ((c)->cop_stashoff = (hv)               \
422                                     ? alloccopstash(hv)                 \
423                                     : 0)
424 #  ifdef NETWARE
425 #    define CopFILE_free(c) SAVECOPFILE_FREE(c)
426 #  else
427 #    define CopFILE_free(c)     (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
428 #  endif
429 #else
430 #  define CopFILEGV(c)          ((c)->cop_filegv)
431 #  define CopFILEGV_set(c,gv)   ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv))
432 #  define CopFILE_set(c,pv)     CopFILEGV_set((c), gv_fetchfile(pv))
433 #  define CopFILE_setn(c,pv,l)  CopFILEGV_set((c), gv_fetchfile_flags((pv),(l),0))
434 #  define CopFILESV(c)          (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL)
435 #  define CopFILEAV(c)          (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL)
436 #  ifdef DEBUGGING
437 #    define CopFILEAVx(c)       (assert(CopFILEGV(c)), GvAV(CopFILEGV(c)))
438 #  else
439 #    define CopFILEAVx(c)       (GvAV(CopFILEGV(c)))
440 # endif
441 #  define CopFILE(c)            (CopFILEGV(c) \
442                                     ? GvNAME(CopFILEGV(c))+2 : NULL)
443 #  define CopSTASH(c)           ((c)->cop_stash)
444 #  define CopSTASH_set(c,hv)    ((c)->cop_stash = (hv))
445 #  define CopFILE_free(c)       (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))
446
447 #endif /* USE_ITHREADS */
448
449 #define CopSTASHPV(c)           (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
450    /* cop_stash is not refcounted */
451 #define CopSTASHPV_set(c,pv)    CopSTASH_set((c), gv_stashpv(pv,GV_ADD))
452 #define CopSTASH_eq(c,hv)       (CopSTASH(c) == (hv))
453
454 #define CopHINTHASH_get(c)      ((COPHH*)((c)->cop_hints_hash))
455 #define CopHINTHASH_set(c,h)    ((c)->cop_hints_hash = (h))
456
457 /*
458 =head1 COP Hint Reading
459 */
460
461 /*
462 =for apidoc Am|SV *|cop_hints_fetch_pvn|const COP *cop|const char *keypv|STRLEN keylen|U32 hash|U32 flags
463
464 Look up the hint entry in the cop C<cop> with the key specified by
465 C<keypv> and C<keylen>.  If C<flags> has the C<COPHH_KEY_UTF8> bit set,
466 the key octets are interpreted as UTF-8, otherwise they are interpreted
467 as Latin-1.  C<hash> is a precomputed hash of the key string, or zero if
468 it has not been precomputed.  Returns a mortal scalar copy of the value
469 associated with the key, or C<&PL_sv_placeholder> if there is no value
470 associated with the key.
471
472 =cut
473 */
474
475 #define cop_hints_fetch_pvn(cop, keypv, keylen, hash, flags) \
476     cophh_fetch_pvn(CopHINTHASH_get(cop), keypv, keylen, hash, flags)
477
478 /*
479 =for apidoc Am|SV *|cop_hints_fetch_pvs|const COP *cop|const char *key|U32 flags
480
481 Like L</cop_hints_fetch_pvn>, but takes a literal string instead of a
482 string/length pair, and no precomputed hash.
483
484 =cut
485 */
486
487 #define cop_hints_fetch_pvs(cop, key, flags) \
488     cophh_fetch_pvs(CopHINTHASH_get(cop), key, flags)
489
490 /*
491 =for apidoc Am|SV *|cop_hints_fetch_pv|const COP *cop|const char *key|U32 hash|U32 flags
492
493 Like L</cop_hints_fetch_pvn>, but takes a nul-terminated string instead
494 of a string/length pair.
495
496 =cut
497 */
498
499 #define cop_hints_fetch_pv(cop, key, hash, flags) \
500     cophh_fetch_pv(CopHINTHASH_get(cop), key, hash, flags)
501
502 /*
503 =for apidoc Am|SV *|cop_hints_fetch_sv|const COP *cop|SV *key|U32 hash|U32 flags
504
505 Like L</cop_hints_fetch_pvn>, but takes a Perl scalar instead of a
506 string/length pair.
507
508 =cut
509 */
510
511 #define cop_hints_fetch_sv(cop, key, hash, flags) \
512     cophh_fetch_sv(CopHINTHASH_get(cop), key, hash, flags)
513
514 /*
515 =for apidoc Am|HV *|cop_hints_2hv|const COP *cop|U32 flags
516
517 Generates and returns a standard Perl hash representing the full set of
518 hint entries in the cop C<cop>.  C<flags> is currently unused and must
519 be zero.
520
521 =cut
522 */
523
524 #define cop_hints_2hv(cop, flags) \
525     cophh_2hv(CopHINTHASH_get(cop), flags)
526
527 #define CopLABEL(c)  Perl_cop_fetch_label(aTHX_ (c), NULL, NULL)
528 #define CopLABEL_len(c,len)  Perl_cop_fetch_label(aTHX_ (c), len, NULL)
529 #define CopLABEL_len_flags(c,len,flags)  Perl_cop_fetch_label(aTHX_ (c), len, flags)
530 #define CopLABEL_alloc(pv)      ((pv)?savepv(pv):NULL)
531
532 #define CopSTASH_ne(c,hv)       (!CopSTASH_eq(c,hv))
533 #define CopLINE(c)              ((c)->cop_line)
534 #define CopLINE_inc(c)          (++CopLINE(c))
535 #define CopLINE_dec(c)          (--CopLINE(c))
536 #define CopLINE_set(c,l)        (CopLINE(c) = (l))
537
538 /* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */
539 #define OutCopFILE(c) CopFILE(c)
540
541 #define CopHINTS_get(c)         ((c)->cop_hints + 0)
542 #define CopHINTS_set(c, h)      STMT_START {                            \
543                                     (c)->cop_hints = (h);               \
544                                 } STMT_END
545
546 /*
547  * Here we have some enormously heavy (or at least ponderous) wizardry.
548  */
549
550 /* subroutine context */
551 struct block_sub {
552     OP *        retop;  /* op to execute on exit from sub */
553     /* Above here is the same for sub, format and eval.  */
554     CV *        cv;
555     /* Above here is the same for sub and format.  */
556     AV *        savearray;
557     AV *        argarray;
558     I32         olddepth;
559     PAD         *oldcomppad;
560 };
561
562
563 /* format context */
564 struct block_format {
565     OP *        retop;  /* op to execute on exit from sub */
566     /* Above here is the same for sub, format and eval.  */
567     CV *        cv;
568     /* Above here is the same for sub and format.  */
569     GV *        gv;
570     GV *        dfoutgv;
571 };
572
573 /* base for the next two macros. Don't use directly.
574  * The context frame holds a reference to the CV so that it can't be
575  * freed while we're executing it */
576
577 #define PUSHSUB_BASE(cx)                                                \
578         ENTRY_PROBE(CvNAMED(cv)                                         \
579                         ? HEK_KEY(CvNAME_HEK(cv))                       \
580                         : GvENAME(CvGV(cv)),                            \
581                 CopFILE((const COP *)CvSTART(cv)),                      \
582                 CopLINE((const COP *)CvSTART(cv)),                      \
583                 CopSTASHPV((const COP *)CvSTART(cv)));                  \
584                                                                         \
585         cx->blk_sub.cv = cv;                                            \
586         cx->blk_sub.olddepth = CvDEPTH(cv);                             \
587         cx->cx_type |= (hasargs) ? CXp_HASARGS : 0;                     \
588         cx->blk_sub.retop = NULL;                                       \
589         if (!CvDEPTH(cv))                                               \
590             SvREFCNT_inc_simple_void_NN(cv);
591
592 #define PUSHSUB_GET_LVALUE_MASK(func) \
593         /* If the context is indeterminate, then only the lvalue */     \
594         /* flags that the caller also has are applicable.        */     \
595         (                                                               \
596            (PL_op->op_flags & OPf_WANT)                                 \
597                ? OPpENTERSUB_LVAL_MASK                                  \
598                : !(PL_op->op_private & OPpENTERSUB_LVAL_MASK)           \
599                    ? 0 : (U8)func(aTHX)                                 \
600         )
601
602 #define PUSHSUB(cx)                                                     \
603     {                                                                   \
604         U8 phlags = PUSHSUB_GET_LVALUE_MASK(Perl_was_lvalue_sub);       \
605         PUSHSUB_BASE(cx)                                                \
606         cx->blk_u16 = PL_op->op_private &                               \
607                           (phlags|OPpDEREF);                            \
608     }
609
610 /* variant for use by OP_DBSTATE, where op_private holds hint bits */
611 #define PUSHSUB_DB(cx)                                                  \
612         PUSHSUB_BASE(cx)                                                \
613         cx->blk_u16 = 0;
614
615
616 #define PUSHFORMAT(cx, retop)                                           \
617         cx->blk_format.cv = cv;                                         \
618         cx->blk_format.gv = gv;                                         \
619         cx->blk_format.retop = (retop);                                 \
620         cx->blk_format.dfoutgv = PL_defoutgv;                           \
621         cx->blk_u16 = 0;                                                \
622         if (!CvDEPTH(cv)) SvREFCNT_inc_simple_void_NN(cv);              \
623         CvDEPTH(cv)++;                                                  \
624         SvREFCNT_inc_void(cx->blk_format.dfoutgv)
625
626 #define POP_SAVEARRAY()                                         \
627     STMT_START {                                                        \
628         SvREFCNT_dec(GvAV(PL_defgv));                                   \
629         GvAV(PL_defgv) = cx->blk_sub.savearray;                         \
630     } STMT_END
631
632 /* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
633  * leave any (a fast av_clear(ary), basically) */
634 #define CLEAR_ARGARRAY(ary) \
635     STMT_START {                                                        \
636         AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary);                      \
637         AvARRAY(ary) = AvALLOC(ary);                                    \
638         AvFILLp(ary) = -1;                                              \
639     } STMT_END
640
641 #define POPSUB(cx,sv)                                                   \
642     STMT_START {                                                        \
643         const I32 olddepth = cx->blk_sub.olddepth;                      \
644         if (!(cx->blk_u16 & CxPOPSUB_DONE)) {                           \
645         cx->blk_u16 |= CxPOPSUB_DONE;                                   \
646         RETURN_PROBE(CvNAMED(cx->blk_sub.cv)                            \
647                         ? HEK_KEY(CvNAME_HEK(cx->blk_sub.cv))           \
648                         : GvENAME(CvGV(cx->blk_sub.cv)),                \
649                 CopFILE((COP*)CvSTART((const CV*)cx->blk_sub.cv)),      \
650                 CopLINE((COP*)CvSTART((const CV*)cx->blk_sub.cv)),      \
651                 CopSTASHPV((COP*)CvSTART((const CV*)cx->blk_sub.cv)));  \
652                                                                         \
653         if (CxHASARGS(cx)) {                                            \
654             POP_SAVEARRAY();                                            \
655             /* abandon @_ if it got reified */                          \
656             if (AvREAL(cx->blk_sub.argarray)) {                         \
657                 const SSize_t fill = AvFILLp(cx->blk_sub.argarray);     \
658                 SvREFCNT_dec_NN(cx->blk_sub.argarray);                  \
659                 cx->blk_sub.argarray = newAV();                         \
660                 av_extend(cx->blk_sub.argarray, fill);                  \
661                 AvREIFY_only(cx->blk_sub.argarray);                     \
662                 CX_CURPAD_SV(cx->blk_sub, 0) = MUTABLE_SV(cx->blk_sub.argarray); \
663             }                                                           \
664             else {                                                      \
665                 CLEAR_ARGARRAY(cx->blk_sub.argarray);                   \
666             }                                                           \
667         }                                                               \
668         }                                                               \
669         sv = MUTABLE_SV(cx->blk_sub.cv);                                \
670         LEAVE_SCOPE(PL_scopestack[cx->blk_oldscopesp-1]);               \
671         if (sv && (CvDEPTH((const CV*)sv) = olddepth))                  \
672             sv = NULL;                                          \
673     } STMT_END
674
675 #define LEAVESUB(sv)                                                    \
676     STMT_START {                                                        \
677         SvREFCNT_dec(sv);                                               \
678     } STMT_END
679
680 #define POPFORMAT(cx)                                                   \
681     STMT_START {                                                        \
682         if (!(cx->blk_u16 & CxPOPSUB_DONE)) {                           \
683         CV * const cv = cx->blk_format.cv;                              \
684         GV * const dfuot = cx->blk_format.dfoutgv;                      \
685         cx->blk_u16 |= CxPOPSUB_DONE;                                   \
686         setdefout(dfuot);                                               \
687         LEAVE_SCOPE(PL_scopestack[cx->blk_oldscopesp-1]);               \
688         if (!--CvDEPTH(cv))                                             \
689             SvREFCNT_dec_NN(cx->blk_format.cv);                         \
690         SvREFCNT_dec_NN(dfuot);                                         \
691         }                                                               \
692     } STMT_END
693
694 /* eval context */
695 struct block_eval {
696     OP *        retop;  /* op to execute on exit from eval */
697     /* Above here is the same for sub, format and eval.  */
698     SV *        old_namesv;
699     OP *        old_eval_root;
700     SV *        cur_text;
701     CV *        cv;
702     JMPENV *    cur_top_env; /* value of PL_top_env when eval CX created */
703 };
704
705 /* If we ever need more than 512 op types, change the shift from 7.
706    blku_gimme is actually also only 2 bits, so could be merged with something.
707 */
708
709 #define CxOLD_IN_EVAL(cx)       (((cx)->blk_u16) & 0x7F)
710 #define CxOLD_OP_TYPE(cx)       (((cx)->blk_u16) >> 7)
711
712 #define PUSHEVAL(cx,n)                                                  \
713     STMT_START {                                                        \
714         assert(!(PL_in_eval & ~0x7F));                                  \
715         assert(!(PL_op->op_type & ~0x1FF));                             \
716         cx->blk_u16 = (PL_in_eval & 0x7F) | ((U16)PL_op->op_type << 7); \
717         cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL);            \
718         cx->blk_eval.old_eval_root = PL_eval_root;                      \
719         cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL;  \
720         cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */    \
721         cx->blk_eval.retop = NULL;                                      \
722         cx->blk_eval.cur_top_env = PL_top_env;                          \
723     } STMT_END
724
725 #define POPEVAL(cx)                                                     \
726     STMT_START {                                                        \
727         PL_in_eval = CxOLD_IN_EVAL(cx);                                 \
728         optype = CxOLD_OP_TYPE(cx);                                     \
729         PL_eval_root = cx->blk_eval.old_eval_root;                      \
730         if (cx->blk_eval.cur_text && SvSCREAM(cx->blk_eval.cur_text))   \
731             SvREFCNT_dec_NN(cx->blk_eval.cur_text);                     \
732         if (cx->blk_eval.old_namesv)                                    \
733             sv_2mortal(cx->blk_eval.old_namesv);                        \
734     } STMT_END
735
736 /* loop context */
737 struct block_loop {
738     I32         resetsp;
739     LOOP *      my_op;  /* My op, that contains redo, next and last ops.  */
740     union {     /* different ways of locating the iteration variable */
741         SV      **svp;
742         GV      *gv;
743         PAD     *oldcomppad; /* only used in ITHREADS */
744     } itervar_u;
745     union {
746         struct { /* valid if type is LOOP_FOR or LOOP_PLAIN (but {NULL,0})*/
747             AV * ary; /* use the stack if this is NULL */
748             IV ix;
749         } ary;
750         struct { /* valid if type is LOOP_LAZYIV */
751             IV cur;
752             IV end;
753         } lazyiv;
754         struct { /* valid if type if LOOP_LAZYSV */
755             SV * cur;
756             SV * end; /* maxiumum value (or minimum in reverse) */
757         } lazysv;
758     } state_u;
759 };
760
761 #ifdef USE_ITHREADS
762 #  define CxITERVAR_PADSV(c) \
763         &CX_CURPAD_SV( (c)->blk_loop.itervar_u, (c)->blk_loop.my_op->op_targ)
764 #else
765 #  define CxITERVAR_PADSV(c) ((c)->blk_loop.itervar_u.svp)
766 #endif
767
768 #define CxITERVAR(c)                                                    \
769         ((c)->blk_loop.itervar_u.oldcomppad                             \
770          ? (CxPADLOOP(c)                                                \
771             ? CxITERVAR_PADSV(c)                                        \
772             : isGV((c)->blk_loop.itervar_u.gv)                          \
773                 ? &GvSV((c)->blk_loop.itervar_u.gv)                     \
774                 : (SV **)&(c)->blk_loop.itervar_u.gv)                   \
775          : (SV**)NULL)
776
777 #define CxLABEL(c)      (0 + CopLABEL((c)->blk_oldcop))
778 #define CxLABEL_len(c,len)      (0 + CopLABEL_len((c)->blk_oldcop, len))
779 #define CxLABEL_len_flags(c,len,flags)  (0 + CopLABEL_len_flags((c)->blk_oldcop, len, flags))
780 #define CxHASARGS(c)    (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
781 #define CxLVAL(c)       (0 + ((c)->blk_u16 & 0xff))
782 /* POPSUB has already been performed on this context frame */
783 #define CxPOPSUB_DONE 0x100
784
785
786 #define PUSHLOOP_PLAIN(cx, s)                                           \
787         cx->blk_loop.resetsp = s - PL_stack_base;                       \
788         cx->blk_loop.my_op = cLOOP;                                     \
789         cx->blk_loop.state_u.ary.ary = NULL;                            \
790         cx->blk_loop.state_u.ary.ix = 0;                                \
791         cx->blk_loop.itervar_u.svp = NULL;
792
793 #define PUSHLOOP_FOR(cx, ivar, s)                                       \
794         cx->blk_loop.resetsp = s - PL_stack_base;                       \
795         cx->blk_loop.my_op = cLOOP;                                     \
796         cx->blk_loop.state_u.ary.ary = NULL;                            \
797         cx->blk_loop.state_u.ary.ix = 0;                                \
798         cx->blk_loop.itervar_u.svp = (SV**)(ivar);
799
800 #define POPLOOP(cx)                                                     \
801         if (CxTYPE(cx) == CXt_LOOP_LAZYSV) {                            \
802             SvREFCNT_dec_NN(cx->blk_loop.state_u.lazysv.cur);           \
803             SvREFCNT_dec_NN(cx->blk_loop.state_u.lazysv.end);           \
804         }                                                               \
805         if (CxTYPE(cx) == CXt_LOOP_FOR)                                 \
806             SvREFCNT_dec(cx->blk_loop.state_u.ary.ary);
807
808 /* given/when context */
809 struct block_givwhen {
810         OP *leave_op;
811 };
812
813 #define PUSHGIVEN(cx)                                                   \
814         cx->blk_givwhen.leave_op = cLOGOP->op_other;
815
816 #define PUSHWHEN PUSHGIVEN
817
818 /* context common to subroutines, evals and loops */
819 struct block {
820     U8          blku_type;      /* what kind of context this is */
821     U8          blku_gimme;     /* is this block running in list context? */
822     U16         blku_u16;       /* used by block_sub and block_eval (so far) */
823     I32         blku_oldsp;     /* stack pointer to copy stuff down to */
824     COP *       blku_oldcop;    /* old curcop pointer */
825     I32         blku_oldmarksp; /* mark stack index */
826     I32         blku_oldscopesp;        /* scope stack index */
827     PMOP *      blku_oldpm;     /* values of pattern match vars */
828
829     union {
830         struct block_sub        blku_sub;
831         struct block_format     blku_format;
832         struct block_eval       blku_eval;
833         struct block_loop       blku_loop;
834         struct block_givwhen    blku_givwhen;
835     } blk_u;
836 };
837 #define blk_oldsp       cx_u.cx_blk.blku_oldsp
838 #define blk_oldcop      cx_u.cx_blk.blku_oldcop
839 #define blk_oldmarksp   cx_u.cx_blk.blku_oldmarksp
840 #define blk_oldscopesp  cx_u.cx_blk.blku_oldscopesp
841 #define blk_oldpm       cx_u.cx_blk.blku_oldpm
842 #define blk_gimme       cx_u.cx_blk.blku_gimme
843 #define blk_u16         cx_u.cx_blk.blku_u16
844 #define blk_sub         cx_u.cx_blk.blk_u.blku_sub
845 #define blk_format      cx_u.cx_blk.blk_u.blku_format
846 #define blk_eval        cx_u.cx_blk.blk_u.blku_eval
847 #define blk_loop        cx_u.cx_blk.blk_u.blku_loop
848 #define blk_givwhen     cx_u.cx_blk.blk_u.blku_givwhen
849
850 #define DEBUG_CX(action)                                                \
851     DEBUG_l(                                                            \
852         Perl_deb(aTHX_ "CX %ld %s %s (scope %ld,%ld) at %s:%d\n",       \
853                     (long)cxstack_ix,                                   \
854                     action,                                             \
855                     PL_block_type[CxTYPE(&cxstack[cxstack_ix])],        \
856                     (long)PL_scopestack_ix,                             \
857                     (long)(cxstack[cxstack_ix].blk_oldscopesp),         \
858                     __FILE__, __LINE__));
859
860 /* Enter a block. */
861 #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix],            \
862         cx->cx_type             = t,                                    \
863         cx->blk_oldsp           = sp - PL_stack_base,                   \
864         cx->blk_oldcop          = PL_curcop,                            \
865         cx->blk_oldmarksp       = PL_markstack_ptr - PL_markstack,      \
866         cx->blk_oldscopesp      = PL_scopestack_ix,                     \
867         cx->blk_oldpm           = PL_curpm,                             \
868         cx->blk_gimme           = (U8)gimme;                            \
869         DEBUG_CX("PUSH");
870
871 /* Exit a block (RETURN and LAST). */
872 #define POPBLOCK(cx,pm)                                                 \
873         DEBUG_CX("POP");                                                \
874         cx = &cxstack[cxstack_ix--],                                    \
875         newsp            = PL_stack_base + cx->blk_oldsp,               \
876         PL_curcop        = cx->blk_oldcop,                              \
877         PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
878         PL_scopestack_ix = cx->blk_oldscopesp,                          \
879         pm               = cx->blk_oldpm,                               \
880         gimme            = cx->blk_gimme;
881
882 /* Continue a block elsewhere (NEXT and REDO). */
883 #define TOPBLOCK(cx)                                                    \
884         DEBUG_CX("TOP");                                                \
885         cx  = &cxstack[cxstack_ix],                                     \
886         PL_stack_sp      = PL_stack_base + cx->blk_oldsp,               \
887         PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
888         PL_scopestack_ix = cx->blk_oldscopesp,                          \
889         PL_curpm         = cx->blk_oldpm;
890
891 /* substitution context */
892 struct subst {
893     U8          sbu_type;       /* what kind of context this is */
894     U8          sbu_rflags;
895     U16         sbu_rxtainted;  /* matches struct block */
896     I32         sbu_oldsave;
897     SSize_t     sbu_iters;
898     SSize_t     sbu_maxiters;
899     char *      sbu_orig;
900     SV *        sbu_dstr;
901     SV *        sbu_targ;
902     char *      sbu_s;
903     char *      sbu_m;
904     char *      sbu_strend;
905     void *      sbu_rxres;
906     REGEXP *    sbu_rx;
907 };
908 #define sb_iters        cx_u.cx_subst.sbu_iters
909 #define sb_maxiters     cx_u.cx_subst.sbu_maxiters
910 #define sb_rflags       cx_u.cx_subst.sbu_rflags
911 #define sb_oldsave      cx_u.cx_subst.sbu_oldsave
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
921
922 #ifdef PERL_CORE
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,                                 \
932         cx->sb_s                = s,                                    \
933         cx->sb_m                = m,                                    \
934         cx->sb_strend           = strend,                               \
935         cx->sb_rxres            = NULL,                                 \
936         cx->sb_rx               = rx,                                   \
937         cx->cx_type             = CXt_SUBST | (once ? CXp_ONCE : 0);    \
938         rxres_save(&cx->sb_rxres, rx);                                  \
939         (void)ReREFCNT_inc(rx);                                         \
940         SvREFCNT_inc_void_NN(targ)
941
942 #  define POPSUBST(cx) cx = &cxstack[cxstack_ix--];                     \
943         rxres_free(&cx->sb_rxres);                                      \
944         ReREFCNT_dec(cx->sb_rx);                                        \
945         SvREFCNT_dec_NN(cx->sb_targ)
946 #endif
947
948 #define CxONCE(cx)              ((cx)->cx_type & CXp_ONCE)
949
950 struct context {
951     union {
952         struct block    cx_blk;
953         struct subst    cx_subst;
954     } cx_u;
955 };
956 #define cx_type cx_u.cx_subst.sbu_type
957
958 /* If you re-order these, there is also an array of uppercase names in perl.h
959    and a static array of context names in pp_ctl.c  */
960 #define CXTYPEMASK      0xf
961 #define CXt_NULL        0
962 #define CXt_WHEN        1
963 #define CXt_BLOCK       2
964 /* When micro-optimising :-) keep GIVEN next to the LOOPs, as these 5 share a
965    jump table in pp_ctl.c
966    The first 4 don't have a 'case' in at least one switch statement in pp_ctl.c
967 */
968 #define CXt_GIVEN       3
969 /* This is first so that CXt_LOOP_FOR|CXt_LOOP_LAZYIV is CXt_LOOP_LAZYIV */
970 #define CXt_LOOP_FOR    4
971 #define CXt_LOOP_PLAIN  5
972 #define CXt_LOOP_LAZYSV 6
973 #define CXt_LOOP_LAZYIV 7
974 #define CXt_SUB         8
975 #define CXt_FORMAT      9
976 #define CXt_EVAL       10
977 #define CXt_SUBST      11
978 /* SUBST doesn't feature in all switch statements.  */
979
980 /* private flags for CXt_SUB and CXt_NULL
981    However, this is checked in many places which do not check the type, so
982    this bit needs to be kept clear for most everything else. For reasons I
983    haven't investigated, it can coexist with CXp_FOR_DEF */
984 #define CXp_MULTICALL   0x10    /* part of a multicall (so don't
985                                    tear down context on exit). */ 
986
987 /* private flags for CXt_SUB and CXt_FORMAT */
988 #define CXp_HASARGS     0x20
989 #define CXp_SUB_RE      0x40    /* code called within regex, i.e. (?{}) */
990 #define CXp_SUB_RE_FAKE 0x80    /* fake sub CX for (?{}) in current scope */
991
992 /* private flags for CXt_EVAL */
993 #define CXp_REAL        0x20    /* truly eval'', not a lookalike */
994 #define CXp_TRYBLOCK    0x40    /* eval{}, not eval'' or similar */
995
996 /* private flags for CXt_LOOP */
997 #define CXp_FOR_DEF     0x10    /* foreach using $_ */
998 #define CXp_FOR_LVREF   0x20    /* foreach using \$var */
999 #define CxPADLOOP(c)    ((c)->blk_loop.my_op->op_targ)
1000
1001 /* private flags for CXt_SUBST */
1002 #define CXp_ONCE        0x10    /* What was sbu_once in struct subst */
1003
1004 #define CxTYPE(c)       ((c)->cx_type & CXTYPEMASK)
1005 #define CxTYPE_is_LOOP(c)       (((c)->cx_type & 0xC) == 0x4)
1006 #define CxMULTICALL(c)  (((c)->cx_type & CXp_MULTICALL)                 \
1007                          == CXp_MULTICALL)
1008 #define CxREALEVAL(c)   (((c)->cx_type & (CXTYPEMASK|CXp_REAL))         \
1009                          == (CXt_EVAL|CXp_REAL))
1010 #define CxTRYBLOCK(c)   (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK))     \
1011                          == (CXt_EVAL|CXp_TRYBLOCK))
1012 #define CxFOREACH(c)    (CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN)
1013 #define CxFOREACHDEF(c) ((CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN) \
1014                          && ((c)->cx_type & CXp_FOR_DEF))
1015
1016 #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
1017
1018 /* 
1019 =head1 "Gimme" Values
1020 */
1021
1022 /*
1023 =for apidoc AmU||G_SCALAR
1024 Used to indicate scalar context.  See C<L</GIMME_V>>, C<L</GIMME>>, and
1025 L<perlcall>.
1026
1027 =for apidoc AmU||G_ARRAY
1028 Used to indicate list context.  See C<L</GIMME_V>>, C<L</GIMME>> and
1029 L<perlcall>.
1030
1031 =for apidoc AmU||G_VOID
1032 Used to indicate void context.  See C<L</GIMME_V>> and L<perlcall>.
1033
1034 =for apidoc AmU||G_DISCARD
1035 Indicates that arguments returned from a callback should be discarded.  See
1036 L<perlcall>.
1037
1038 =for apidoc AmU||G_EVAL
1039
1040 Used to force a Perl C<eval> wrapper around a callback.  See
1041 L<perlcall>.
1042
1043 =for apidoc AmU||G_NOARGS
1044
1045 Indicates that no arguments are being sent to a callback.  See
1046 L<perlcall>.
1047
1048 =cut
1049 */
1050
1051 #define G_SCALAR        2
1052 #define G_ARRAY         3
1053 #define G_VOID          1
1054 #define G_WANT          3
1055
1056 /* extra flags for Perl_call_* routines */
1057 #define G_DISCARD       4       /* Call FREETMPS.
1058                                    Don't change this without consulting the
1059                                    hash actions codes defined in hv.h */
1060 #define G_EVAL          8       /* Assume eval {} around subroutine call. */
1061 #define G_NOARGS       16       /* Don't construct a @_ array. */
1062 #define G_KEEPERR      32       /* Warn for errors, don't overwrite $@ */
1063 #define G_NODEBUG      64       /* Disable debugging at toplevel.  */
1064 #define G_METHOD      128       /* Calling method. */
1065 #define G_FAKINGEVAL  256       /* Faking an eval context for call_sv or
1066                                    fold_constants. */
1067 #define G_UNDEF_FILL  512       /* Fill the stack with &PL_sv_undef
1068                                    A special case for UNSHIFT in
1069                                    Perl_magic_methcall().  */
1070 #define G_WRITING_TO_STDERR 1024 /* Perl_write_to_stderr() is calling
1071                                     Perl_magic_methcall().  */
1072 #define G_RE_REPARSING 0x800     /* compiling a run-time /(?{..})/ */
1073 #define G_METHOD_NAMED 4096     /* calling named method, eg without :: or ' */
1074
1075 /* flag bits for PL_in_eval */
1076 #define EVAL_NULL       0       /* not in an eval */
1077 #define EVAL_INEVAL     1       /* some enclosing scope is an eval */
1078 #define EVAL_WARNONLY   2       /* used by yywarn() when calling yyerror() */
1079 #define EVAL_KEEPERR    4       /* set by Perl_call_sv if G_KEEPERR */
1080 #define EVAL_INREQUIRE  8       /* The code is being required. */
1081 #define EVAL_RE_REPARSING 0x10  /* eval_sv() called with G_RE_REPARSING */
1082
1083 /* Support for switching (stack and block) contexts.
1084  * This ensures magic doesn't invalidate local stack and cx pointers.
1085  */
1086
1087 #define PERLSI_UNKNOWN          -1
1088 #define PERLSI_UNDEF            0
1089 #define PERLSI_MAIN             1
1090 #define PERLSI_MAGIC            2
1091 #define PERLSI_SORT             3
1092 #define PERLSI_SIGNAL           4
1093 #define PERLSI_OVERLOAD         5
1094 #define PERLSI_DESTROY          6
1095 #define PERLSI_WARNHOOK         7
1096 #define PERLSI_DIEHOOK          8
1097 #define PERLSI_REQUIRE          9
1098 #define PERLSI_MULTICALL       10
1099
1100 struct stackinfo {
1101     AV *                si_stack;       /* stack for current runlevel */
1102     PERL_CONTEXT *      si_cxstack;     /* context stack for runlevel */
1103     struct stackinfo *  si_prev;
1104     struct stackinfo *  si_next;
1105     I32                 si_cxix;        /* current context index */
1106     I32                 si_cxmax;       /* maximum allocated index */
1107     I32                 si_type;        /* type of runlevel */
1108     I32                 si_markoff;     /* offset where markstack begins for us.
1109                                          * currently used only with DEBUGGING,
1110                                          * but not #ifdef-ed for bincompat */
1111 };
1112
1113 typedef struct stackinfo PERL_SI;
1114
1115 #define cxstack         (PL_curstackinfo->si_cxstack)
1116 #define cxstack_ix      (PL_curstackinfo->si_cxix)
1117 #define cxstack_max     (PL_curstackinfo->si_cxmax)
1118
1119 #ifdef DEBUGGING
1120 #  define       SET_MARK_OFFSET \
1121     PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
1122 #else
1123 #  define       SET_MARK_OFFSET NOOP
1124 #endif
1125
1126 #define PUSHSTACKi(type) \
1127     STMT_START {                                                        \
1128         PERL_SI *next = PL_curstackinfo->si_next;                       \
1129         DEBUG_l({                                                       \
1130             int i = 0; PERL_SI *p = PL_curstackinfo;                    \
1131             while (p) { i++; p = p->si_prev; }                          \
1132             Perl_deb(aTHX_ "push STACKINFO %d at %s:%d\n",              \
1133                          i, __FILE__, __LINE__);})                      \
1134         if (!next) {                                                    \
1135             next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1);    \
1136             next->si_prev = PL_curstackinfo;                            \
1137             PL_curstackinfo->si_next = next;                            \
1138         }                                                               \
1139         next->si_type = type;                                           \
1140         next->si_cxix = -1;                                             \
1141         AvFILLp(next->si_stack) = 0;                                    \
1142         SWITCHSTACK(PL_curstack,next->si_stack);                        \
1143         PL_curstackinfo = next;                                         \
1144         SET_MARK_OFFSET;                                                \
1145     } STMT_END
1146
1147 #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
1148
1149 /* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
1150  * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
1151 #define POPSTACK \
1152     STMT_START {                                                        \
1153         dSP;                                                            \
1154         PERL_SI * const prev = PL_curstackinfo->si_prev;                \
1155         DEBUG_l({                                                       \
1156             int i = -1; PERL_SI *p = PL_curstackinfo;                   \
1157             while (p) { i++; p = p->si_prev; }                          \
1158             Perl_deb(aTHX_ "pop  STACKINFO %d at %s:%d\n",              \
1159                          i, __FILE__, __LINE__);})                      \
1160         if (!prev) {                                                    \
1161             Perl_croak_popstack();                                      \
1162         }                                                               \
1163         SWITCHSTACK(PL_curstack,prev->si_stack);                        \
1164         /* don't free prev here, free them all at the END{} */          \
1165         PL_curstackinfo = prev;                                         \
1166     } STMT_END
1167
1168 #define POPSTACK_TO(s) \
1169     STMT_START {                                                        \
1170         while (PL_curstack != s) {                                      \
1171             dounwind(-1);                                               \
1172             POPSTACK;                                                   \
1173         }                                                               \
1174     } STMT_END
1175
1176 #define IN_PERL_COMPILETIME     (PL_curcop == &PL_compiling)
1177 #define IN_PERL_RUNTIME         (PL_curcop != &PL_compiling)
1178
1179 /*
1180 =head1 Multicall Functions
1181
1182 =for apidoc Ams||dMULTICALL
1183 Declare local variables for a multicall.  See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1184
1185 =for apidoc Ams||PUSH_MULTICALL
1186 Opening bracket for a lightweight callback.
1187 See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1188
1189 =for apidoc Ams||MULTICALL
1190 Make a lightweight callback.  See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1191
1192 =for apidoc Ams||POP_MULTICALL
1193 Closing bracket for a lightweight callback.
1194 See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1195
1196 =cut
1197 */
1198
1199 #define dMULTICALL \
1200     SV **newsp;                 /* set by POPBLOCK */                   \
1201     PERL_CONTEXT *cx;                                                   \
1202     CV *multicall_cv;                                                   \
1203     OP *multicall_cop;                                                  \
1204     bool multicall_oldcatch;                                            \
1205     U8 hasargs = 0              /* used by PUSHSUB */
1206
1207 #define PUSH_MULTICALL(the_cv) \
1208     PUSH_MULTICALL_FLAGS(the_cv, 0)
1209
1210 /* Like PUSH_MULTICALL, but allows you to specify extra flags
1211  * for the CX stack entry (this isn't part of the public API) */
1212
1213 #define PUSH_MULTICALL_FLAGS(the_cv, flags) \
1214     STMT_START {                                                        \
1215         CV * const _nOnclAshIngNamE_ = the_cv;                          \
1216         CV * const cv = _nOnclAshIngNamE_;                              \
1217         PADLIST * const padlist = CvPADLIST(cv);                        \
1218         ENTER;                                                          \
1219         multicall_oldcatch = CATCH_GET;                                 \
1220         SAVETMPS; SAVEVPTR(PL_op);                                      \
1221         CATCH_SET(TRUE);                                                \
1222         PUSHSTACKi(PERLSI_MULTICALL);                                   \
1223         PUSHBLOCK(cx, (CXt_SUB|CXp_MULTICALL|flags), PL_stack_sp);      \
1224         PUSHSUB(cx);                                                    \
1225         if (!(flags & CXp_SUB_RE_FAKE))                                 \
1226             CvDEPTH(cv)++;                                              \
1227         if (CvDEPTH(cv) >= 2) {                                         \
1228             PERL_STACK_OVERFLOW_CHECK();                                \
1229             Perl_pad_push(aTHX_ padlist, CvDEPTH(cv));                  \
1230         }                                                               \
1231         SAVECOMPPAD();                                                  \
1232         PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));                       \
1233         multicall_cv = cv;                                              \
1234         multicall_cop = CvSTART(cv);                                    \
1235     } STMT_END
1236
1237 #define MULTICALL \
1238     STMT_START {                                                        \
1239         PL_op = multicall_cop;                                          \
1240         CALLRUNOPS(aTHX);                                               \
1241     } STMT_END
1242
1243 #define POP_MULTICALL \
1244     STMT_START {                                                        \
1245         cx = &cxstack[cxstack_ix];                                      \
1246         if (! ((CvDEPTH(multicall_cv) = cx->blk_sub.olddepth)) ) {      \
1247                 LEAVESUB(multicall_cv);                                 \
1248         }                                                               \
1249         POPBLOCK(cx,PL_curpm);                                          \
1250         POPSTACK;                                                       \
1251         CATCH_SET(multicall_oldcatch);                                  \
1252         LEAVE;                                                          \
1253         SPAGAIN;                                                        \
1254     } STMT_END
1255
1256 /* Change the CV of an already-pushed MULTICALL CxSUB block.
1257  * (this isn't part of the public API) */
1258
1259 #define CHANGE_MULTICALL_FLAGS(the_cv, flags) \
1260     STMT_START {                                                        \
1261         CV * const _nOnclAshIngNamE_ = the_cv;                          \
1262         CV * const cv = _nOnclAshIngNamE_;                              \
1263         PADLIST * const padlist = CvPADLIST(cv);                        \
1264         cx = &cxstack[cxstack_ix];                                      \
1265         assert(cx->cx_type & CXp_MULTICALL);                            \
1266         if (! ((CvDEPTH(multicall_cv) = cx->blk_sub.olddepth)) ) {      \
1267                 LEAVESUB(multicall_cv);                                 \
1268         }                                                               \
1269         cx->cx_type = (CXt_SUB|CXp_MULTICALL|flags);                    \
1270         PUSHSUB(cx);                                                    \
1271         if (!(flags & CXp_SUB_RE_FAKE))                                 \
1272             CvDEPTH(cv)++;                                              \
1273         if (CvDEPTH(cv) >= 2) {                                         \
1274             PERL_STACK_OVERFLOW_CHECK();                                \
1275             Perl_pad_push(aTHX_ padlist, CvDEPTH(cv));                  \
1276         }                                                               \
1277         SAVECOMPPAD();                                                  \
1278         PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));                       \
1279         multicall_cv = cv;                                              \
1280         multicall_cop = CvSTART(cv);                                    \
1281     } STMT_END
1282 /*
1283  * ex: set ts=8 sts=4 sw=4 et:
1284  */