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Add a flag G_WANT, as a mask for the bits G_SCALAR, G_ARRAY and G_VOID.
[perl5.git] / cop.h
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a0d0e21e 1/* cop.h
79072805 2 *
4bb101f2 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
663f364b 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, by Larry Wall and others
79072805
LW
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 *
a3985cdc 9 * Control ops (cops) are one of the three ops OP_NEXTSTATE, OP_DBSTATE,
3ffa1527
JH
10 * and OP_SETSTATE 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,
a3985cdc 13 * and thus can be used to determine our current state.
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14 */
15
0d2925a6
DM
16/* A jmpenv packages the state required to perform a proper non-local jump.
17 * Note that there is a start_env initialized when perl starts, and top_env
18 * points to this initially, so top_env should always be non-null.
19 *
20 * Existence of a non-null top_env->je_prev implies it is valid to call
21 * longjmp() at that runlevel (we make sure start_env.je_prev is always
22 * null to ensure this).
23 *
24 * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
25 * establish a local jmpenv to handle exception traps. Care must be taken
26 * to restore the previous value of je_mustcatch before exiting the
27 * stack frame iff JMPENV_PUSH was not called in that stack frame.
28 * GSAR 97-03-27
29 */
30
31struct jmpenv {
32 struct jmpenv * je_prev;
33 Sigjmp_buf je_buf; /* only for use if !je_throw */
34 int je_ret; /* last exception thrown */
35 bool je_mustcatch; /* need to call longjmp()? */
36};
37
38typedef struct jmpenv JMPENV;
39
40#ifdef OP_IN_REGISTER
41#define OP_REG_TO_MEM PL_opsave = op
42#define OP_MEM_TO_REG op = PL_opsave
43#else
44#define OP_REG_TO_MEM NOOP
45#define OP_MEM_TO_REG NOOP
46#endif
47
48/*
49 * How to build the first jmpenv.
50 *
51 * top_env needs to be non-zero. It points to an area
52 * in which longjmp() stuff is stored, as C callstack
53 * info there at least is thread specific this has to
54 * be per-thread. Otherwise a 'die' in a thread gives
55 * that thread the C stack of last thread to do an eval {}!
56 */
57
58#define JMPENV_BOOTSTRAP \
59 STMT_START { \
60 Zero(&PL_start_env, 1, JMPENV); \
61 PL_start_env.je_ret = -1; \
62 PL_start_env.je_mustcatch = TRUE; \
63 PL_top_env = &PL_start_env; \
64 } STMT_END
65
66/*
67 * PERL_FLEXIBLE_EXCEPTIONS
68 *
69 * All the flexible exceptions code has been removed.
70 * See the following threads for details:
71 *
72 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-07/msg00378.html
73 *
74 * Joshua's original patches (which weren't applied) and discussion:
75 *
76 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01396.html
77 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01489.html
78 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01491.html
79 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01608.html
80 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02144.html
81 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02998.html
82 *
83 * Chip's reworked patch and discussion:
84 *
85 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1999-03/msg00520.html
86 *
87 * The flaw in these patches (which went unnoticed at the time) was
88 * that they moved some code that could potentially die() out of the
89 * region protected by the setjmp()s. This caused exceptions within
90 * END blocks and such to not be handled by the correct setjmp().
91 *
92 * The original patches that introduces flexible exceptions were:
93 *
94 * http://public.activestate.com/cgi-bin/perlbrowse?patch=3386
95 * http://public.activestate.com/cgi-bin/perlbrowse?patch=5162
96 */
97
98#define dJMPENV JMPENV cur_env
99
100#define JMPENV_PUSH(v) \
101 STMT_START { \
102 DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p\n", \
ca0270c4 103 (void*)&cur_env, (void*)PL_top_env)); \
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104 cur_env.je_prev = PL_top_env; \
105 OP_REG_TO_MEM; \
106 cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \
107 OP_MEM_TO_REG; \
108 PL_top_env = &cur_env; \
109 cur_env.je_mustcatch = FALSE; \
110 (v) = cur_env.je_ret; \
111 } STMT_END
112
113#define JMPENV_POP \
114 STMT_START { \
115 DEBUG_l(Perl_deb(aTHX_ "popping jumplevel was %p, now %p\n", \
ca0270c4 116 (void*)PL_top_env, (void*)cur_env.je_prev)); \
0d2925a6
DM
117 PL_top_env = cur_env.je_prev; \
118 } STMT_END
119
120#define JMPENV_JUMP(v) \
121 STMT_START { \
122 OP_REG_TO_MEM; \
123 if (PL_top_env->je_prev) \
124 PerlProc_longjmp(PL_top_env->je_buf, (v)); \
125 if ((v) == 2) \
37038d91 126 PerlProc_exit(STATUS_EXIT); \
0d2925a6
DM
127 PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \
128 PerlProc_exit(1); \
129 } STMT_END
130
131#define CATCH_GET (PL_top_env->je_mustcatch)
132#define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))
133
134
5ac1e9b2 135#include "mydtrace.h"
0d2925a6 136
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137struct cop {
138 BASEOP
d7f23a06
NC
139 /* On LP64 putting this here takes advantage of the fact that BASEOP isn't
140 an exact multiple of 8 bytes to save structure padding. */
141 line_t cop_line; /* line # of this command */
a0d0e21e 142 char * cop_label; /* label for this construct */
57843af0 143#ifdef USE_ITHREADS
11faa288 144 char * cop_stashpv; /* package line was compiled in */
57843af0
GS
145 char * cop_file; /* file name the following line # is from */
146#else
11faa288 147 HV * cop_stash; /* package line was compiled in */
79072805 148 GV * cop_filegv; /* file the following line # is from */
57843af0 149#endif
d5ec2987 150 U32 cop_hints; /* hints bits from pragmata */
a0d0e21e 151 U32 cop_seq; /* parse sequence number */
72dc9ed5
NC
152 /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *: */
153 STRLEN * cop_warnings; /* lexical warnings bitmask */
b3ca2e83
NC
154 /* compile time state of %^H. See the comment in op.c for how this is
155 used to recreate a hash to return from caller. */
c28fe1ec 156 struct refcounted_he * cop_hints_hash;
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157};
158
57843af0
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159#ifdef USE_ITHREADS
160# define CopFILE(c) ((c)->cop_file)
161# define CopFILEGV(c) (CopFILE(c) \
a0714e2c 162 ? gv_fetchfile(CopFILE(c)) : NULL)
083fcd59 163
7e4e8c89
NC
164# ifdef NETWARE
165# define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv))
d9095cec 166# define CopFILE_setn(c,pv,l) ((c)->cop_file = savepv((pv),(l)))
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167# else
168# define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv))
d9095cec 169# define CopFILE_setn(c,pv,l) ((c)->cop_file = savesharedpvn((pv),(l)))
7e4e8c89 170# endif
083fcd59 171
57843af0 172# define CopFILESV(c) (CopFILE(c) \
a0714e2c 173 ? GvSV(gv_fetchfile(CopFILE(c))) : NULL)
57843af0 174# define CopFILEAV(c) (CopFILE(c) \
7d49f689 175 ? GvAV(gv_fetchfile(CopFILE(c))) : NULL)
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176# ifdef DEBUGGING
177# define CopFILEAVx(c) (assert(CopFILE(c)), \
36c7798d 178 GvAV(gv_fetchfile(CopFILE(c))))
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179# else
180# define CopFILEAVx(c) (GvAV(gv_fetchfile(CopFILE(c))))
181# endif
57843af0 182# define CopSTASHPV(c) ((c)->cop_stashpv)
083fcd59 183
7e4e8c89 184# ifdef NETWARE
bd61b366 185# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : NULL))
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186# else
187# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv))
188# endif
083fcd59 189
11faa288 190# define CopSTASH(c) (CopSTASHPV(c) \
5c284bb0 191 ? gv_stashpv(CopSTASHPV(c),GV_ADD) : NULL)
bd61b366 192# define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME_get(hv) : NULL)
ed221c57 193# define CopSTASH_eq(c,hv) ((hv) && stashpv_hvname_match(c,hv))
6a3d5e3d 194# define CopLABEL(c) ((c)->cop_label)
63031daf 195# define CopLABEL_set(c,pv) (CopLABEL(c) = (pv))
7e4e8c89
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196# ifdef NETWARE
197# define CopSTASH_free(c) SAVECOPSTASH_FREE(c)
7e4e8c89 198# define CopFILE_free(c) SAVECOPFILE_FREE(c)
6a3d5e3d 199# define CopLABEL_free(c) SAVECOPLABEL_FREE(c)
63031daf 200# define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)
7e4e8c89 201# else
ed221c57 202# define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c))
bd61b366 203# define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
6a3d5e3d 204# define CopLABEL_free(c) (PerlMemShared_free(CopLABEL(c)),(CopLABEL(c) = NULL))
63031daf 205# define CopLABEL_alloc(pv) ((pv)?savesharedpv(pv):NULL)
7e4e8c89 206# endif
57843af0
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207#else
208# define CopFILEGV(c) ((c)->cop_filegv)
f4dd75d9
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209# define CopFILEGV_set(c,gv) ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv))
210# define CopFILE_set(c,pv) CopFILEGV_set((c), gv_fetchfile(pv))
d9095cec 211# define CopFILE_setn(c,pv,l) CopFILEGV_set((c), gv_fetchfile_flags((pv),(l),0))
a0714e2c 212# define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL)
7d49f689 213# define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL)
8688788e
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214# ifdef DEBUGGING
215# define CopFILEAVx(c) (assert(CopFILEGV(c)), GvAV(CopFILEGV(c)))
216# else
217# define CopFILEAVx(c) (GvAV(CopFILEGV(c)))
218# endif
be46dfad
RGS
219# define CopFILE(c) (CopFILEGV(c) && GvSV(CopFILEGV(c)) \
220 ? SvPVX(GvSV(CopFILEGV(c))) : NULL)
57843af0 221# define CopSTASH(c) ((c)->cop_stash)
6a3d5e3d 222# define CopLABEL(c) ((c)->cop_label)
f4dd75d9 223# define CopSTASH_set(c,hv) ((c)->cop_stash = (hv))
bd61b366 224# define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
f4dd75d9
GS
225 /* cop_stash is not refcounted */
226# define CopSTASHPV_set(c,pv) CopSTASH_set((c), gv_stashpv(pv,GV_ADD))
227# define CopSTASH_eq(c,hv) (CopSTASH(c) == (hv))
63031daf 228# define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)
6a3d5e3d 229# define CopLABEL_set(c,pv) (CopLABEL(c) = (pv))
05ec9bb3 230# define CopSTASH_free(c)
a0714e2c 231# define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))
63031daf 232# define CopLABEL_free(c) (Safefree(CopLABEL(c)),(CopLABEL(c) = NULL))
05ec9bb3 233
57843af0
GS
234#endif /* USE_ITHREADS */
235
ed094faf 236#define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv))
cc49e20b 237#define CopLINE(c) ((c)->cop_line)
57843af0
GS
238#define CopLINE_inc(c) (++CopLINE(c))
239#define CopLINE_dec(c) (--CopLINE(c))
240#define CopLINE_set(c,l) (CopLINE(c) = (l))
cc49e20b 241
248c2a4d
CN
242/* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */
243#ifdef MACOS_TRADITIONAL
244# define OutCopFILE(c) MacPerl_MPWFileName(CopFILE(c))
245#else
246# define OutCopFILE(c) CopFILE(c)
247#endif
248
7b0bddfa
NC
249/* If $[ is non-zero, it's stored in cop_hints under the key "$[", and
250 HINT_ARYBASE is set to indicate this.
251 Setting it is ineficient due to the need to create 2 mortal SVs, but as
252 using $[ is highly discouraged, no sane Perl code will be using it. */
253#define CopARYBASE_get(c) \
254 ((CopHINTS_get(c) & HINT_ARYBASE) \
c28fe1ec
NC
255 ? SvIV(Perl_refcounted_he_fetch(aTHX_ (c)->cop_hints_hash, 0, \
256 "$[", 2, 0, 0)) \
7b0bddfa
NC
257 : 0)
258#define CopARYBASE_set(c, b) STMT_START { \
d5ec2987
NC
259 if (b || ((c)->cop_hints & HINT_ARYBASE)) { \
260 (c)->cop_hints |= HINT_ARYBASE; \
7b0bddfa
NC
261 if ((c) == &PL_compiling) \
262 PL_hints |= HINT_LOCALIZE_HH | HINT_ARYBASE; \
c28fe1ec
NC
263 (c)->cop_hints_hash \
264 = Perl_refcounted_he_new(aTHX_ (c)->cop_hints_hash, \
84bafc02 265 newSVpvs_flags("$[", SVs_TEMP), \
7b0bddfa
NC
266 sv_2mortal(newSViv(b))); \
267 } \
268 } STMT_END
fc15ae8f 269
623e6609 270/* FIXME NATIVE_HINTS if this is changed from op_private (see perl.h) */
d5ec2987 271#define CopHINTS_get(c) ((c)->cop_hints + 0)
623e6609 272#define CopHINTS_set(c, h) STMT_START { \
d5ec2987 273 (c)->cop_hints = (h); \
623e6609
NC
274 } STMT_END
275
79072805
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276/*
277 * Here we have some enormously heavy (or at least ponderous) wizardry.
278 */
279
280/* subroutine context */
281struct block_sub {
f9c764c5 282 OP * retop; /* op to execute on exit from sub */
8e663997
NC
283 /* Above here is the same for sub, format and eval. */
284 CV * cv;
f9c764c5
NC
285 U8 lval; /* XXX merge lval and hasargs? */
286 /* Above here is the same for sub and format. */
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287 AV * savearray;
288 AV * argarray;
bb172083 289 I32 olddepth;
f3548bdc 290 PAD *oldcomppad;
f9c764c5
NC
291};
292
293
294/* format context */
295struct block_format {
f39bc417 296 OP * retop; /* op to execute on exit from sub */
8e663997
NC
297 /* Above here is the same for sub, format and eval. */
298 CV * cv;
f9c764c5
NC
299 U8 lval; /* XXX merge lval and hasargs? */
300 /* Above here is the same for sub and format. */
301 GV * gv;
302 GV * dfoutgv;
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303};
304
b36bdeca
DM
305/* base for the next two macros. Don't use directly.
306 * Note that the refcnt of the cv is incremented twice; The CX one is
307 * decremented by LEAVESUB, the other by LEAVE. */
308
ee98a1d6 309#define PUSHSUB_BASE(cx) \
5ac1e9b2
AA
310 ENTRY_PROBE(GvENAME(CvGV(cv)), \
311 CopFILE((COP*)CvSTART(cv)), \
312 CopLINE((COP*)CvSTART(cv))); \
313 \
79072805 314 cx->blk_sub.cv = cv; \
b8f55b69 315 cx->blk_sub.olddepth = CvDEPTH(cv); \
ae423868 316 cx->cx_type |= (hasargs) ? CXp_HASARGS : 0; \
5f66b61c 317 cx->blk_sub.retop = NULL; \
b36bdeca 318 if (!CvDEPTH(cv)) { \
74c765eb
AL
319 SvREFCNT_inc_simple_void_NN(cv); \
320 SvREFCNT_inc_simple_void_NN(cv); \
b36bdeca
DM
321 SAVEFREESV(cv); \
322 }
323
ee98a1d6
DM
324
325#define PUSHSUB(cx) \
326 PUSHSUB_BASE(cx) \
cc8d50a7
NC
327 cx->blk_sub.lval = PL_op->op_private & \
328 (OPpLVAL_INTRO|OPpENTERSUB_INARGS);
79072805 329
ee98a1d6
DM
330/* variant for use by OP_DBSTATE, where op_private holds hint bits */
331#define PUSHSUB_DB(cx) \
332 PUSHSUB_BASE(cx) \
cc8d50a7 333 cx->blk_sub.lval = 0;
ee98a1d6
DM
334
335
10067d9a 336#define PUSHFORMAT(cx, retop) \
f9c764c5
NC
337 cx->blk_format.cv = cv; \
338 cx->blk_format.gv = gv; \
339 cx->blk_format.retop = (retop); \
f9c764c5
NC
340 cx->blk_format.dfoutgv = PL_defoutgv; \
341 SvREFCNT_inc_void(cx->blk_format.dfoutgv)
79072805 342
3db8f154 343#define POP_SAVEARRAY() \
6d4ff0d2 344 STMT_START { \
3280af22 345 SvREFCNT_dec(GvAV(PL_defgv)); \
a8bba7fa 346 GvAV(PL_defgv) = cx->blk_sub.savearray; \
6d4ff0d2 347 } STMT_END
6d4ff0d2 348
ecf8e9dd 349/* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
8e09340b
GS
350 * leave any (a fast av_clear(ary), basically) */
351#define CLEAR_ARGARRAY(ary) \
352 STMT_START { \
353 AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \
9c6bc640 354 AvARRAY(ary) = AvALLOC(ary); \
8e09340b
GS
355 AvFILLp(ary) = -1; \
356 } STMT_END
7766f137 357
b0d9ce38
GS
358#define POPSUB(cx,sv) \
359 STMT_START { \
5ac1e9b2
AA
360 RETURN_PROBE(GvENAME(CvGV((CV*)cx->blk_sub.cv)), \
361 CopFILE((COP*)CvSTART((CV*)cx->blk_sub.cv)), \
362 CopLINE((COP*)CvSTART((CV*)cx->blk_sub.cv))); \
363 \
bafb2adc 364 if (CxHASARGS(cx)) { \
7766f137 365 POP_SAVEARRAY(); \
d8b46c1b 366 /* abandon @_ if it got reified */ \
a8bba7fa 367 if (AvREAL(cx->blk_sub.argarray)) { \
e2d306cb 368 const SSize_t fill = AvFILLp(cx->blk_sub.argarray); \
a8bba7fa
GS
369 SvREFCNT_dec(cx->blk_sub.argarray); \
370 cx->blk_sub.argarray = newAV(); \
371 av_extend(cx->blk_sub.argarray, fill); \
11ca45c0 372 AvREIFY_only(cx->blk_sub.argarray); \
dd2155a4 373 CX_CURPAD_SV(cx->blk_sub, 0) = (SV*)cx->blk_sub.argarray; \
d8b46c1b 374 } \
7766f137 375 else { \
8e09340b 376 CLEAR_ARGARRAY(cx->blk_sub.argarray); \
7766f137 377 } \
79072805 378 } \
b0d9ce38
GS
379 sv = (SV*)cx->blk_sub.cv; \
380 if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \
a0714e2c 381 sv = NULL; \
b0d9ce38
GS
382 } STMT_END
383
384#define LEAVESUB(sv) \
385 STMT_START { \
386 if (sv) \
387 SvREFCNT_dec(sv); \
388 } STMT_END
79072805
LW
389
390#define POPFORMAT(cx) \
f9c764c5
NC
391 setdefout(cx->blk_format.dfoutgv); \
392 SvREFCNT_dec(cx->blk_format.dfoutgv);
79072805
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393
394/* eval context */
395struct block_eval {
8e663997
NC
396 OP * retop; /* op to execute on exit from eval */
397 /* Above here is the same for sub, format and eval. */
31a3f62b
NC
398 U8 old_in_eval;
399 U16 old_op_type;
0f79a09d 400 SV * old_namesv;
79072805 401 OP * old_eval_root;
748a9306 402 SV * cur_text;
2090ab20 403 CV * cv;
abd70938 404 JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
79072805
LW
405};
406
8990e307 407#define PUSHEVAL(cx,n,fgv) \
0f79a09d 408 STMT_START { \
3280af22 409 cx->blk_eval.old_in_eval = PL_in_eval; \
a8bba7fa 410 cx->blk_eval.old_op_type = PL_op->op_type; \
a0714e2c 411 cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL); \
a8bba7fa 412 cx->blk_eval.old_eval_root = PL_eval_root; \
bdc0bf6f 413 cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL; \
601f1833 414 cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */ \
5f66b61c 415 cx->blk_eval.retop = NULL; \
abd70938 416 cx->blk_eval.cur_top_env = PL_top_env; \
0f79a09d 417 } STMT_END
79072805
LW
418
419#define POPEVAL(cx) \
0f79a09d 420 STMT_START { \
3280af22 421 PL_in_eval = cx->blk_eval.old_in_eval; \
79072805 422 optype = cx->blk_eval.old_op_type; \
7766f137 423 PL_eval_root = cx->blk_eval.old_eval_root; \
0f79a09d
GS
424 if (cx->blk_eval.old_namesv) \
425 sv_2mortal(cx->blk_eval.old_namesv); \
426 } STMT_END
79072805
LW
427
428/* loop context */
429struct block_loop {
79072805 430 I32 resetsp;
022eaa24
NC
431 LOOP * my_op; /* My op, that contains redo, next and last ops. */
432 /* (except for non_ithreads we need to modify next_op in pp_ctl.c, hence
433 why next_op is conditionally defined below.) */
7766f137
GS
434#ifdef USE_ITHREADS
435 void * iterdata;
f3548bdc 436 PAD *oldcomppad;
7766f137 437#else
022eaa24 438 OP * next_op;
79072805 439 SV ** itervar;
7766f137 440#endif
79072805 441 SV * itersave;
0a498629
NC
442 /* (from inspection of source code) for a .. range of strings this is the
443 current string. */
5f05dabc 444 SV * iterlval;
0a498629
NC
445 /* (from inspection of source code) for a foreach loop this is the array
446 being iterated over. For a .. range of numbers it's the current value.
447 A check is often made on the SvTYPE of iterary to determine whether
448 we are iterating over an array or a range. (numbers or strings) */
79072805 449 AV * iterary;
89ea2908 450 IV iterix;
0a498629
NC
451 /* (from inspection of source code) for a .. range of numbers this is the
452 maximum value. */
89ea2908 453 IV itermax;
79072805 454};
0a498629
NC
455/* It might be possible to squeeze this structure further. As best I can tell
456 itermax and iterlval are never used at the same time, so it might be possible
457 to make them into a union. However, I'm not confident that there are enough
458 flag bits/NULLable pointers in this structure alone to encode which is
459 active. There is, however, U8 of space free in struct block, which could be
460 used. Right now it may not be worth squeezing this structure further, as it's
461 the largest part of struct block, and currently struct block is 64 bytes on
462 an ILP32 system, which will give good cache alignment.
463*/
79072805 464
7766f137
GS
465#ifdef USE_ITHREADS
466# define CxITERVAR(c) \
467 ((c)->blk_loop.iterdata \
468 ? (CxPADLOOP(cx) \
dd2155a4
DM
469 ? &CX_CURPAD_SV( (c)->blk_loop, \
470 INT2PTR(PADOFFSET, (c)->blk_loop.iterdata)) \
7766f137
GS
471 : &GvSV((GV*)(c)->blk_loop.iterdata)) \
472 : (SV**)NULL)
473# define CX_ITERDATA_SET(cx,idata) \
dd2155a4 474 CX_CURPAD_SAVE(cx->blk_loop); \
155aba94 475 if ((cx->blk_loop.iterdata = (idata))) \
d10edb75
KC
476 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
477 else \
a0714e2c 478 cx->blk_loop.itersave = NULL;
7766f137
GS
479#else
480# define CxITERVAR(c) ((c)->blk_loop.itervar)
481# define CX_ITERDATA_SET(cx,ivar) \
155aba94 482 if ((cx->blk_loop.itervar = (SV**)(ivar))) \
d10edb75
KC
483 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
484 else \
a0714e2c 485 cx->blk_loop.itersave = NULL;
7766f137 486#endif
a61a7064 487#define CxLABEL(c) (0 + (c)->blk_oldcop->cop_label)
ae423868 488#define CxHASARGS(c) (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
bafb2adc 489#define CxLVAL(c) (0 + (c)->blk_sub.lval)
7766f137 490
022eaa24
NC
491#ifdef USE_ITHREADS
492# define PUSHLOOP_OP_NEXT /* No need to do anything. */
493# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.my_op->op_nextop + 0)
494#else
495# define PUSHLOOP_OP_NEXT cx->blk_loop.next_op = cLOOP->op_nextop
496# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.next_op + 0)
497#endif
498
7766f137 499#define PUSHLOOP(cx, dat, s) \
38a230cb 500 cx->blk_loop.resetsp = s - PL_stack_base; \
022eaa24
NC
501 cx->blk_loop.my_op = cLOOP; \
502 PUSHLOOP_OP_NEXT; \
a0714e2c 503 cx->blk_loop.iterlval = NULL; \
7d49f689 504 cx->blk_loop.iterary = NULL; \
7766f137
GS
505 cx->blk_loop.iterix = -1; \
506 CX_ITERDATA_SET(cx,dat);
79072805
LW
507
508#define POPLOOP(cx) \
a8bba7fa 509 SvREFCNT_dec(cx->blk_loop.iterlval); \
7766f137 510 if (CxITERVAR(cx)) { \
21401c75 511 if (SvPADMY(cx->blk_loop.itersave)) { \
d4c19fe8 512 SV ** const s_v_p = CxITERVAR(cx); \
21401c75
CH
513 sv_2mortal(*s_v_p); \
514 *s_v_p = cx->blk_loop.itersave; \
515 } \
516 else { \
517 SvREFCNT_dec(cx->blk_loop.itersave); \
518 } \
44a8e56a 519 } \
a8bba7fa
GS
520 if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\
521 SvREFCNT_dec(cx->blk_loop.iterary);
79072805 522
0d863452
RH
523/* given/when context */
524struct block_givwhen {
525 OP *leave_op;
526};
527
528#define PUSHGIVEN(cx) \
529 cx->blk_givwhen.leave_op = cLOGOP->op_other;
530
531#define PUSHWHEN PUSHGIVEN
532
79072805
LW
533/* context common to subroutines, evals and loops */
534struct block {
2e0df0e8
NC
535 U16 blku_type; /* what kind of context this is */
536 U8 blku_gimme; /* is this block running in list context? */
1be1929d 537 U8 blku_spare; /* Padding to match with struct subst */
79072805
LW
538 I32 blku_oldsp; /* stack pointer to copy stuff down to */
539 COP * blku_oldcop; /* old curcop pointer */
79072805
LW
540 I32 blku_oldmarksp; /* mark stack index */
541 I32 blku_oldscopesp; /* scope stack index */
542 PMOP * blku_oldpm; /* values of pattern match vars */
79072805
LW
543
544 union {
545 struct block_sub blku_sub;
f9c764c5 546 struct block_format blku_format;
79072805
LW
547 struct block_eval blku_eval;
548 struct block_loop blku_loop;
0d863452 549 struct block_givwhen blku_givwhen;
79072805
LW
550 } blk_u;
551};
552#define blk_oldsp cx_u.cx_blk.blku_oldsp
553#define blk_oldcop cx_u.cx_blk.blku_oldcop
79072805
LW
554#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
555#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
556#define blk_oldpm cx_u.cx_blk.blku_oldpm
557#define blk_gimme cx_u.cx_blk.blku_gimme
558#define blk_sub cx_u.cx_blk.blk_u.blku_sub
f9c764c5 559#define blk_format cx_u.cx_blk.blk_u.blku_format
79072805
LW
560#define blk_eval cx_u.cx_blk.blk_u.blku_eval
561#define blk_loop cx_u.cx_blk.blk_u.blku_loop
0d863452 562#define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen
79072805
LW
563
564/* Enter a block. */
8990e307 565#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805 566 cx->cx_type = t, \
3280af22
NIS
567 cx->blk_oldsp = sp - PL_stack_base, \
568 cx->blk_oldcop = PL_curcop, \
1aff0e91 569 cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
3280af22 570 cx->blk_oldscopesp = PL_scopestack_ix, \
3280af22 571 cx->blk_oldpm = PL_curpm, \
eb160463 572 cx->blk_gimme = (U8)gimme; \
bf49b057 573 DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
1aff0e91 574 (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
79072805
LW
575
576/* Exit a block (RETURN and LAST). */
a0d0e21e 577#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
1aff0e91 578 newsp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
579 PL_curcop = cx->blk_oldcop, \
580 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
581 PL_scopestack_ix = cx->blk_oldscopesp, \
3280af22
NIS
582 pm = cx->blk_oldpm, \
583 gimme = cx->blk_gimme; \
b4ab917c 584 DEBUG_SCOPE("POPBLOCK"); \
bf49b057 585 DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \
22c35a8c 586 (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
79072805
LW
587
588/* Continue a block elsewhere (NEXT and REDO). */
3280af22 589#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
1aff0e91 590 PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
591 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
592 PL_scopestack_ix = cx->blk_oldscopesp, \
b4ab917c
DM
593 PL_curpm = cx->blk_oldpm; \
594 DEBUG_SCOPE("TOPBLOCK");
79072805
LW
595
596/* substitution context */
597struct subst {
2e0df0e8 598 U16 sbu_type; /* what kind of context this is */
1be1929d
NC
599 U8 sbu_once; /* Actually both booleans, but U8 to matches */
600 U8 sbu_rxtainted; /* struct block */
79072805
LW
601 I32 sbu_iters;
602 I32 sbu_maxiters;
22e551b9 603 I32 sbu_rflags;
4633a7c4 604 I32 sbu_oldsave;
79072805
LW
605 char * sbu_orig;
606 SV * sbu_dstr;
607 SV * sbu_targ;
608 char * sbu_s;
609 char * sbu_m;
610 char * sbu_strend;
c90c0ff4 611 void * sbu_rxres;
c07a80fd 612 REGEXP * sbu_rx;
79072805
LW
613};
614#define sb_iters cx_u.cx_subst.sbu_iters
615#define sb_maxiters cx_u.cx_subst.sbu_maxiters
22e551b9 616#define sb_rflags cx_u.cx_subst.sbu_rflags
4633a7c4 617#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc
PP
618#define sb_once cx_u.cx_subst.sbu_once
619#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
79072805
LW
620#define sb_orig cx_u.cx_subst.sbu_orig
621#define sb_dstr cx_u.cx_subst.sbu_dstr
622#define sb_targ cx_u.cx_subst.sbu_targ
623#define sb_s cx_u.cx_subst.sbu_s
624#define sb_m cx_u.cx_subst.sbu_m
625#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4 626#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd 627#define sb_rx cx_u.cx_subst.sbu_rx
79072805
LW
628
629#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
630 cx->sb_iters = iters, \
631 cx->sb_maxiters = maxiters, \
22e551b9 632 cx->sb_rflags = r_flags, \
4633a7c4 633 cx->sb_oldsave = oldsave, \
71be2cbc
PP
634 cx->sb_once = once, \
635 cx->sb_rxtainted = rxtainted, \
79072805
LW
636 cx->sb_orig = orig, \
637 cx->sb_dstr = dstr, \
638 cx->sb_targ = targ, \
639 cx->sb_s = s, \
640 cx->sb_m = m, \
641 cx->sb_strend = strend, \
4608196e 642 cx->sb_rxres = NULL, \
c07a80fd 643 cx->sb_rx = rx, \
c90c0ff4 644 cx->cx_type = CXt_SUBST; \
e22ae1e2 645 rxres_save(&cx->sb_rxres, rx); \
b69b0499 646 (void)ReREFCNT_inc(rx)
79072805 647
c90c0ff4 648#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
e22ae1e2
DM
649 rxres_free(&cx->sb_rxres); \
650 ReREFCNT_dec(cx->sb_rx)
79072805
LW
651
652struct context {
79072805
LW
653 union {
654 struct block cx_blk;
655 struct subst cx_subst;
656 } cx_u;
657};
2e0df0e8 658#define cx_type cx_u.cx_subst.sbu_type
6b35e009
GS
659
660#define CXTYPEMASK 0xff
79072805
LW
661#define CXt_NULL 0
662#define CXt_SUB 1
663#define CXt_EVAL 2
664#define CXt_LOOP 3
665#define CXt_SUBST 4
666#define CXt_BLOCK 5
7766f137 667#define CXt_FORMAT 6
0d863452
RH
668#define CXt_GIVEN 7
669#define CXt_WHEN 8
79072805 670
9850bf21
RH
671/* private flags for CXt_SUB and CXt_NULL */
672#define CXp_MULTICALL 0x00000400 /* part of a multicall (so don't
673 tear down context on exit). */
674
ae423868
NC
675/* private flags for CXt_SUB and CXt_FORMAT */
676#define CXp_HASARGS 0x00000200
677
6b35e009
GS
678/* private flags for CXt_EVAL */
679#define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */
1d76a5c3 680#define CXp_TRYBLOCK 0x00000200 /* eval{}, not eval'' or similar */
6b35e009 681
7766f137 682/* private flags for CXt_LOOP */
0d863452
RH
683#define CXp_FOREACH 0x00000200 /* a foreach loop */
684#define CXp_FOR_DEF 0x00000400 /* foreach using $_ */
685#ifdef USE_ITHREADS
7766f137
GS
686# define CXp_PADVAR 0x00000100 /* itervar lives on pad, iterdata
687 has pad offset; if not set,
688 iterdata holds GV* */
689# define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \
690 == (CXt_LOOP|CXp_PADVAR))
691#endif
692
6b35e009 693#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
9850bf21
RH
694#define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
695 == CXp_MULTICALL)
0588a150 696#define CxREALEVAL(c) (((c)->cx_type & (CXTYPEMASK|CXp_REAL)) \
7766f137 697 == (CXt_EVAL|CXp_REAL))
0588a150 698#define CxTRYBLOCK(c) (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK)) \
1d76a5c3 699 == (CXt_EVAL|CXp_TRYBLOCK))
0588a150 700#define CxFOREACH(c) (((c)->cx_type & (CXTYPEMASK|CXp_FOREACH)) \
0d863452 701 == (CXt_LOOP|CXp_FOREACH))
0588a150 702#define CxFOREACHDEF(c) (((c)->cx_type & (CXTYPEMASK|CXp_FOREACH|CXp_FOR_DEF))\
0d863452 703 == (CXt_LOOP|CXp_FOREACH|CXp_FOR_DEF))
6b35e009 704
79072805
LW
705#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
706
ccfc67b7
JH
707/*
708=head1 "Gimme" Values
709*/
954c1994
GS
710
711/*
712=for apidoc AmU||G_SCALAR
713Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and
714L<perlcall>.
715
716=for apidoc AmU||G_ARRAY
91e74348 717Used to indicate list context. See C<GIMME_V>, C<GIMME> and
954c1994
GS
718L<perlcall>.
719
720=for apidoc AmU||G_VOID
721Used to indicate void context. See C<GIMME_V> and L<perlcall>.
722
723=for apidoc AmU||G_DISCARD
724Indicates that arguments returned from a callback should be discarded. See
725L<perlcall>.
726
727=for apidoc AmU||G_EVAL
728
729Used to force a Perl C<eval> wrapper around a callback. See
730L<perlcall>.
731
732=for apidoc AmU||G_NOARGS
733
734Indicates that no arguments are being sent to a callback. See
735L<perlcall>.
736
737=cut
738*/
739
a0d0e21e
LW
740#define G_SCALAR 0
741#define G_ARRAY 1
54310121 742#define G_VOID 128 /* skip this bit when adding flags below */
51ce5529 743#define G_WANT (128|1)
79072805 744
864dbfa3 745/* extra flags for Perl_call_* routines */
b54b4831
NC
746#define G_DISCARD 2 /* Call FREETMPS.
747 Don't change this without consulting the
748 hash actions codes defined in hv.h */
a0d0e21e
LW
749#define G_EVAL 4 /* Assume eval {} around subroutine call. */
750#define G_NOARGS 8 /* Don't construct a @_ array. */
54310121 751#define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */
491527d0 752#define G_NODEBUG 32 /* Disable debugging at toplevel. */
968b3946 753#define G_METHOD 64 /* Calling method. */
c40f1585 754#define G_FAKINGEVAL 256 /* Faking an eval context for call_sv or
edb2152a 755 fold_constants. */
e336de0d 756
faef0170
HS
757/* flag bits for PL_in_eval */
758#define EVAL_NULL 0 /* not in an eval */
759#define EVAL_INEVAL 1 /* some enclosing scope is an eval */
760#define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
864dbfa3 761#define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
6dc8a9e4 762#define EVAL_INREQUIRE 8 /* The code is being required. */
faef0170 763
e336de0d
GS
764/* Support for switching (stack and block) contexts.
765 * This ensures magic doesn't invalidate local stack and cx pointers.
766 */
767
e788e7d3
GS
768#define PERLSI_UNKNOWN -1
769#define PERLSI_UNDEF 0
770#define PERLSI_MAIN 1
771#define PERLSI_MAGIC 2
772#define PERLSI_SORT 3
773#define PERLSI_SIGNAL 4
774#define PERLSI_OVERLOAD 5
775#define PERLSI_DESTROY 6
776#define PERLSI_WARNHOOK 7
777#define PERLSI_DIEHOOK 8
778#define PERLSI_REQUIRE 9
e336de0d
GS
779
780struct stackinfo {
781 AV * si_stack; /* stack for current runlevel */
782 PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
9bd87817
NC
783 struct stackinfo * si_prev;
784 struct stackinfo * si_next;
e336de0d
GS
785 I32 si_cxix; /* current context index */
786 I32 si_cxmax; /* maximum allocated index */
787 I32 si_type; /* type of runlevel */
ce2f7c3b 788 I32 si_markoff; /* offset where markstack begins for us.
e336de0d
GS
789 * currently used only with DEBUGGING,
790 * but not #ifdef-ed for bincompat */
791};
792
793typedef struct stackinfo PERL_SI;
794
3280af22
NIS
795#define cxstack (PL_curstackinfo->si_cxstack)
796#define cxstack_ix (PL_curstackinfo->si_cxix)
797#define cxstack_max (PL_curstackinfo->si_cxmax)
e336de0d
GS
798
799#ifdef DEBUGGING
ce2f7c3b
GS
800# define SET_MARK_OFFSET \
801 PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
e336de0d 802#else
ce2f7c3b 803# define SET_MARK_OFFSET NOOP
e336de0d
GS
804#endif
805
d3acc0f7 806#define PUSHSTACKi(type) \
e336de0d 807 STMT_START { \
3280af22 808 PERL_SI *next = PL_curstackinfo->si_next; \
e336de0d
GS
809 if (!next) { \
810 next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
3280af22
NIS
811 next->si_prev = PL_curstackinfo; \
812 PL_curstackinfo->si_next = next; \
e336de0d
GS
813 } \
814 next->si_type = type; \
815 next->si_cxix = -1; \
816 AvFILLp(next->si_stack) = 0; \
3280af22
NIS
817 SWITCHSTACK(PL_curstack,next->si_stack); \
818 PL_curstackinfo = next; \
ce2f7c3b 819 SET_MARK_OFFSET; \
e336de0d
GS
820 } STMT_END
821
e788e7d3 822#define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
d3acc0f7 823
3095d977
GS
824/* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
825 * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
d3acc0f7 826#define POPSTACK \
e336de0d 827 STMT_START { \
39644a26 828 dSP; \
c4420975 829 PERL_SI * const prev = PL_curstackinfo->si_prev; \
e336de0d 830 if (!prev) { \
bf49b057 831 PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \
e336de0d
GS
832 my_exit(1); \
833 } \
3280af22 834 SWITCHSTACK(PL_curstack,prev->si_stack); \
e336de0d 835 /* don't free prev here, free them all at the END{} */ \
3280af22 836 PL_curstackinfo = prev; \
e336de0d
GS
837 } STMT_END
838
839#define POPSTACK_TO(s) \
840 STMT_START { \
3280af22 841 while (PL_curstack != s) { \
bac4b2ad 842 dounwind(-1); \
d3acc0f7 843 POPSTACK; \
bac4b2ad 844 } \
e336de0d 845 } STMT_END
923e4eb5
JH
846
847#define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
848#define IN_PERL_RUNTIME (PL_curcop != &PL_compiling)
849
9850bf21
RH
850/*
851=head1 Multicall Functions
852
853=for apidoc Ams||dMULTICALL
854Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>.
855
856=for apidoc Ams||PUSH_MULTICALL
857Opening bracket for a lightweight callback.
858See L<perlcall/Lightweight Callbacks>.
859
860=for apidoc Ams||MULTICALL
861Make a lightweight callback. See L<perlcall/Lightweight Callbacks>.
862
863=for apidoc Ams||POP_MULTICALL
864Closing bracket for a lightweight callback.
865See L<perlcall/Lightweight Callbacks>.
866
867=cut
868*/
869
870#define dMULTICALL \
871 SV **newsp; /* set by POPBLOCK */ \
872 PERL_CONTEXT *cx; \
82f35e8b 873 CV *multicall_cv; \
9850bf21
RH
874 OP *multicall_cop; \
875 bool multicall_oldcatch; \
876 U8 hasargs = 0 /* used by PUSHSUB */
877
82f35e8b 878#define PUSH_MULTICALL(the_cv) \
9850bf21 879 STMT_START { \
0bcc34c2
AL
880 CV * const _nOnclAshIngNamE_ = the_cv; \
881 CV * const cv = _nOnclAshIngNamE_; \
882 AV * const padlist = CvPADLIST(cv); \
9850bf21
RH
883 ENTER; \
884 multicall_oldcatch = CATCH_GET; \
885 SAVETMPS; SAVEVPTR(PL_op); \
886 CATCH_SET(TRUE); \
887 PUSHBLOCK(cx, CXt_SUB|CXp_MULTICALL, PL_stack_sp); \
888 PUSHSUB(cx); \
889 if (++CvDEPTH(cv) >= 2) { \
890 PERL_STACK_OVERFLOW_CHECK(); \
891 Perl_pad_push(aTHX_ padlist, CvDEPTH(cv)); \
892 } \
893 SAVECOMPPAD(); \
894 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv)); \
82f35e8b 895 multicall_cv = cv; \
9850bf21
RH
896 multicall_cop = CvSTART(cv); \
897 } STMT_END
898
899#define MULTICALL \
900 STMT_START { \
901 PL_op = multicall_cop; \
902 CALLRUNOPS(aTHX); \
903 } STMT_END
904
905#define POP_MULTICALL \
906 STMT_START { \
82f35e8b
RH
907 LEAVESUB(multicall_cv); \
908 CvDEPTH(multicall_cv)--; \
9850bf21
RH
909 POPBLOCK(cx,PL_curpm); \
910 CATCH_SET(multicall_oldcatch); \
911 LEAVE; \
912 } STMT_END
b3ca2e83
NC
913
914/*
915 * Local variables:
916 * c-indentation-style: bsd
917 * c-basic-offset: 4
918 * indent-tabs-mode: t
919 * End:
920 *
921 * ex: set ts=8 sts=4 sw=4 noet:
922 */