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[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,
acde74e1 4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006 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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DM
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
135
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136struct cop {
137 BASEOP
a0d0e21e 138 char * cop_label; /* label for this construct */
57843af0 139#ifdef USE_ITHREADS
11faa288 140 char * cop_stashpv; /* package line was compiled in */
57843af0
GS
141 char * cop_file; /* file name the following line # is from */
142#else
11faa288 143 HV * cop_stash; /* package line was compiled in */
79072805 144 GV * cop_filegv; /* file the following line # is from */
57843af0 145#endif
d5ec2987 146 U32 cop_hints; /* hints bits from pragmata */
a0d0e21e 147 U32 cop_seq; /* parse sequence number */
79072805 148 line_t cop_line; /* line # of this command */
72dc9ed5
NC
149 /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *: */
150 STRLEN * cop_warnings; /* lexical warnings bitmask */
b3ca2e83
NC
151 /* compile time state of %^H. See the comment in op.c for how this is
152 used to recreate a hash to return from caller. */
c28fe1ec 153 struct refcounted_he * cop_hints_hash;
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154};
155
57843af0
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156#ifdef USE_ITHREADS
157# define CopFILE(c) ((c)->cop_file)
158# define CopFILEGV(c) (CopFILE(c) \
a0714e2c 159 ? gv_fetchfile(CopFILE(c)) : NULL)
083fcd59 160
7e4e8c89
NC
161# ifdef NETWARE
162# define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv))
163# else
164# define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv))
165# endif
083fcd59 166
57843af0 167# define CopFILESV(c) (CopFILE(c) \
a0714e2c 168 ? GvSV(gv_fetchfile(CopFILE(c))) : NULL)
57843af0 169# define CopFILEAV(c) (CopFILE(c) \
7d49f689 170 ? GvAV(gv_fetchfile(CopFILE(c))) : NULL)
8688788e
SH
171# ifdef DEBUGGING
172# define CopFILEAVx(c) (assert(CopFILE(c)), \
36c7798d 173 GvAV(gv_fetchfile(CopFILE(c))))
8688788e
SH
174# else
175# define CopFILEAVx(c) (GvAV(gv_fetchfile(CopFILE(c))))
176# endif
57843af0 177# define CopSTASHPV(c) ((c)->cop_stashpv)
083fcd59 178
7e4e8c89 179# ifdef NETWARE
bd61b366 180# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : NULL))
7e4e8c89
NC
181# else
182# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv))
183# endif
083fcd59 184
11faa288 185# define CopSTASH(c) (CopSTASHPV(c) \
5c284bb0 186 ? gv_stashpv(CopSTASHPV(c),GV_ADD) : NULL)
bd61b366 187# define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME_get(hv) : NULL)
ed221c57 188# define CopSTASH_eq(c,hv) ((hv) && stashpv_hvname_match(c,hv))
7e4e8c89
NC
189# ifdef NETWARE
190# define CopSTASH_free(c) SAVECOPSTASH_FREE(c)
7e4e8c89
NC
191# define CopFILE_free(c) SAVECOPFILE_FREE(c)
192# else
ed221c57 193# define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c))
bd61b366 194# define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
7e4e8c89 195# endif
57843af0
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196#else
197# define CopFILEGV(c) ((c)->cop_filegv)
f4dd75d9
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198# define CopFILEGV_set(c,gv) ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv))
199# define CopFILE_set(c,pv) CopFILEGV_set((c), gv_fetchfile(pv))
a0714e2c 200# define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL)
7d49f689 201# define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL)
8688788e
SH
202# ifdef DEBUGGING
203# define CopFILEAVx(c) (assert(CopFILEGV(c)), GvAV(CopFILEGV(c)))
204# else
205# define CopFILEAVx(c) (GvAV(CopFILEGV(c)))
206# endif
bd61b366 207# define CopFILE(c) (CopFILESV(c) ? SvPVX(CopFILESV(c)) : NULL)
57843af0 208# define CopSTASH(c) ((c)->cop_stash)
f4dd75d9 209# define CopSTASH_set(c,hv) ((c)->cop_stash = (hv))
bd61b366 210# define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
f4dd75d9
GS
211 /* cop_stash is not refcounted */
212# define CopSTASHPV_set(c,pv) CopSTASH_set((c), gv_stashpv(pv,GV_ADD))
213# define CopSTASH_eq(c,hv) (CopSTASH(c) == (hv))
05ec9bb3 214# define CopSTASH_free(c)
a0714e2c 215# define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))
05ec9bb3 216
57843af0
GS
217#endif /* USE_ITHREADS */
218
ed094faf 219#define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv))
cc49e20b 220#define CopLINE(c) ((c)->cop_line)
57843af0
GS
221#define CopLINE_inc(c) (++CopLINE(c))
222#define CopLINE_dec(c) (--CopLINE(c))
223#define CopLINE_set(c,l) (CopLINE(c) = (l))
cc49e20b 224
248c2a4d
CN
225/* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */
226#ifdef MACOS_TRADITIONAL
227# define OutCopFILE(c) MacPerl_MPWFileName(CopFILE(c))
228#else
229# define OutCopFILE(c) CopFILE(c)
230#endif
231
7b0bddfa
NC
232/* If $[ is non-zero, it's stored in cop_hints under the key "$[", and
233 HINT_ARYBASE is set to indicate this.
234 Setting it is ineficient due to the need to create 2 mortal SVs, but as
235 using $[ is highly discouraged, no sane Perl code will be using it. */
236#define CopARYBASE_get(c) \
237 ((CopHINTS_get(c) & HINT_ARYBASE) \
c28fe1ec
NC
238 ? SvIV(Perl_refcounted_he_fetch(aTHX_ (c)->cop_hints_hash, 0, \
239 "$[", 2, 0, 0)) \
7b0bddfa
NC
240 : 0)
241#define CopARYBASE_set(c, b) STMT_START { \
d5ec2987
NC
242 if (b || ((c)->cop_hints & HINT_ARYBASE)) { \
243 (c)->cop_hints |= HINT_ARYBASE; \
7b0bddfa
NC
244 if ((c) == &PL_compiling) \
245 PL_hints |= HINT_LOCALIZE_HH | HINT_ARYBASE; \
c28fe1ec
NC
246 (c)->cop_hints_hash \
247 = Perl_refcounted_he_new(aTHX_ (c)->cop_hints_hash, \
7b0bddfa
NC
248 sv_2mortal(newSVpvs("$[")), \
249 sv_2mortal(newSViv(b))); \
250 } \
251 } STMT_END
fc15ae8f 252
623e6609 253/* FIXME NATIVE_HINTS if this is changed from op_private (see perl.h) */
d5ec2987 254#define CopHINTS_get(c) ((c)->cop_hints + 0)
623e6609 255#define CopHINTS_set(c, h) STMT_START { \
d5ec2987 256 (c)->cop_hints = (h); \
623e6609
NC
257 } STMT_END
258
79072805
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259/*
260 * Here we have some enormously heavy (or at least ponderous) wizardry.
261 */
262
263/* subroutine context */
264struct block_sub {
265 CV * cv;
266 GV * gv;
463ee0b2 267 GV * dfoutgv;
79072805
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268 AV * savearray;
269 AV * argarray;
bb172083 270 I32 olddepth;
2bce612f
NC
271 /* These are merged to to get struct context down to 64 bytes on ILP32. */
272 U8 hasargs_lval;
f3548bdc 273 PAD *oldcomppad;
f39bc417 274 OP * retop; /* op to execute on exit from sub */
79072805
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275};
276
2bce612f
NC
277#define CX_SUB_HASARGS_SET(cx, v) ((cx)->blk_sub.hasargs_lval = \
278 ((cx)->blk_sub.hasargs_lval & 0xFE) | ((v) ? 1 : 0))
279#define CX_SUB_HASARGS_GET(cx) ((cx)->blk_sub.hasargs_lval & 0x01)
1c75a43b 280
2bce612f
NC
281#define CX_SUB_LVAL_SET(cx, v) ((cx)->blk_sub.hasargs_lval = \
282 (((cx)->blk_sub.hasargs_lval & 0x01) | ((v) & (OPpLVAL_INTRO|OPpENTERSUB_INARGS))))
283#define CX_SUB_LVAL(cx) ((cx)->blk_sub.hasargs_lval & 0xFE)
284#define CX_SUB_LVAL_INARGS(cx) ((cx)->blk_sub.hasargs_lval & \
1c75a43b
NC
285 OPpENTERSUB_INARGS)
286
b36bdeca
DM
287/* base for the next two macros. Don't use directly.
288 * Note that the refcnt of the cv is incremented twice; The CX one is
289 * decremented by LEAVESUB, the other by LEAVE. */
290
ee98a1d6 291#define PUSHSUB_BASE(cx) \
79072805 292 cx->blk_sub.cv = cv; \
b8f55b69 293 cx->blk_sub.olddepth = CvDEPTH(cv); \
006bba40 294 CX_SUB_HASARGS_SET(cx, hasargs); \
5f66b61c 295 cx->blk_sub.retop = NULL; \
b36bdeca 296 if (!CvDEPTH(cv)) { \
74c765eb
AL
297 SvREFCNT_inc_simple_void_NN(cv); \
298 SvREFCNT_inc_simple_void_NN(cv); \
b36bdeca
DM
299 SAVEFREESV(cv); \
300 }
301
ee98a1d6
DM
302
303#define PUSHSUB(cx) \
304 PUSHSUB_BASE(cx) \
1c75a43b 305 CX_SUB_LVAL_SET(cx, PL_op->op_private)
79072805 306
ee98a1d6
DM
307/* variant for use by OP_DBSTATE, where op_private holds hint bits */
308#define PUSHSUB_DB(cx) \
309 PUSHSUB_BASE(cx) \
1c75a43b 310 CX_SUB_LVAL_SET(cx, 0)
ee98a1d6
DM
311
312
79072805
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313#define PUSHFORMAT(cx) \
314 cx->blk_sub.cv = cv; \
315 cx->blk_sub.gv = gv; \
5f66b61c 316 cx->blk_sub.retop = NULL; \
006bba40 317 CX_SUB_HASARGS_SET(cx, 0); \
3280af22 318 cx->blk_sub.dfoutgv = PL_defoutgv; \
b37c2d43 319 SvREFCNT_inc_void(cx->blk_sub.dfoutgv)
79072805 320
3db8f154 321#define POP_SAVEARRAY() \
6d4ff0d2 322 STMT_START { \
3280af22 323 SvREFCNT_dec(GvAV(PL_defgv)); \
a8bba7fa 324 GvAV(PL_defgv) = cx->blk_sub.savearray; \
6d4ff0d2 325 } STMT_END
6d4ff0d2 326
ecf8e9dd 327/* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
8e09340b
GS
328 * leave any (a fast av_clear(ary), basically) */
329#define CLEAR_ARGARRAY(ary) \
330 STMT_START { \
331 AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \
f880fe2f 332 SvPV_set(ary, (char*)AvALLOC(ary)); \
8e09340b
GS
333 AvFILLp(ary) = -1; \
334 } STMT_END
7766f137 335
b0d9ce38
GS
336#define POPSUB(cx,sv) \
337 STMT_START { \
006bba40 338 if (CX_SUB_HASARGS_GET(cx)) { \
7766f137 339 POP_SAVEARRAY(); \
d8b46c1b 340 /* abandon @_ if it got reified */ \
a8bba7fa 341 if (AvREAL(cx->blk_sub.argarray)) { \
e2d306cb 342 const SSize_t fill = AvFILLp(cx->blk_sub.argarray); \
a8bba7fa
GS
343 SvREFCNT_dec(cx->blk_sub.argarray); \
344 cx->blk_sub.argarray = newAV(); \
345 av_extend(cx->blk_sub.argarray, fill); \
11ca45c0 346 AvREIFY_only(cx->blk_sub.argarray); \
dd2155a4 347 CX_CURPAD_SV(cx->blk_sub, 0) = (SV*)cx->blk_sub.argarray; \
d8b46c1b 348 } \
7766f137 349 else { \
8e09340b 350 CLEAR_ARGARRAY(cx->blk_sub.argarray); \
7766f137 351 } \
79072805 352 } \
b0d9ce38
GS
353 sv = (SV*)cx->blk_sub.cv; \
354 if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \
a0714e2c 355 sv = NULL; \
b0d9ce38
GS
356 } STMT_END
357
358#define LEAVESUB(sv) \
359 STMT_START { \
360 if (sv) \
361 SvREFCNT_dec(sv); \
362 } STMT_END
79072805
LW
363
364#define POPFORMAT(cx) \
4633a7c4
LW
365 setdefout(cx->blk_sub.dfoutgv); \
366 SvREFCNT_dec(cx->blk_sub.dfoutgv);
79072805
LW
367
368/* eval context */
369struct block_eval {
370 I32 old_in_eval;
371 I32 old_op_type;
0f79a09d 372 SV * old_namesv;
79072805 373 OP * old_eval_root;
748a9306 374 SV * cur_text;
2090ab20 375 CV * cv;
f39bc417 376 OP * retop; /* op to execute on exit from eval */
abd70938 377 JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
79072805
LW
378};
379
8990e307 380#define PUSHEVAL(cx,n,fgv) \
0f79a09d 381 STMT_START { \
3280af22 382 cx->blk_eval.old_in_eval = PL_in_eval; \
a8bba7fa 383 cx->blk_eval.old_op_type = PL_op->op_type; \
a0714e2c 384 cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL); \
a8bba7fa 385 cx->blk_eval.old_eval_root = PL_eval_root; \
0f79a09d 386 cx->blk_eval.cur_text = PL_linestr; \
601f1833 387 cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */ \
5f66b61c 388 cx->blk_eval.retop = NULL; \
abd70938 389 cx->blk_eval.cur_top_env = PL_top_env; \
0f79a09d 390 } STMT_END
79072805
LW
391
392#define POPEVAL(cx) \
0f79a09d 393 STMT_START { \
3280af22 394 PL_in_eval = cx->blk_eval.old_in_eval; \
79072805 395 optype = cx->blk_eval.old_op_type; \
7766f137 396 PL_eval_root = cx->blk_eval.old_eval_root; \
0f79a09d
GS
397 if (cx->blk_eval.old_namesv) \
398 sv_2mortal(cx->blk_eval.old_namesv); \
399 } STMT_END
79072805
LW
400
401/* loop context */
402struct block_loop {
403 char * label;
404 I32 resetsp;
405 OP * redo_op;
406 OP * next_op;
407 OP * last_op;
7766f137
GS
408#ifdef USE_ITHREADS
409 void * iterdata;
f3548bdc 410 PAD *oldcomppad;
7766f137 411#else
79072805 412 SV ** itervar;
7766f137 413#endif
79072805 414 SV * itersave;
5f05dabc 415 SV * iterlval;
79072805 416 AV * iterary;
89ea2908
GA
417 IV iterix;
418 IV itermax;
79072805
LW
419};
420
7766f137
GS
421#ifdef USE_ITHREADS
422# define CxITERVAR(c) \
423 ((c)->blk_loop.iterdata \
424 ? (CxPADLOOP(cx) \
dd2155a4
DM
425 ? &CX_CURPAD_SV( (c)->blk_loop, \
426 INT2PTR(PADOFFSET, (c)->blk_loop.iterdata)) \
7766f137
GS
427 : &GvSV((GV*)(c)->blk_loop.iterdata)) \
428 : (SV**)NULL)
429# define CX_ITERDATA_SET(cx,idata) \
dd2155a4 430 CX_CURPAD_SAVE(cx->blk_loop); \
155aba94 431 if ((cx->blk_loop.iterdata = (idata))) \
d10edb75
KC
432 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
433 else \
a0714e2c 434 cx->blk_loop.itersave = NULL;
7766f137
GS
435#else
436# define CxITERVAR(c) ((c)->blk_loop.itervar)
437# define CX_ITERDATA_SET(cx,ivar) \
155aba94 438 if ((cx->blk_loop.itervar = (SV**)(ivar))) \
d10edb75
KC
439 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
440 else \
a0714e2c 441 cx->blk_loop.itersave = NULL;
7766f137
GS
442#endif
443
444#define PUSHLOOP(cx, dat, s) \
38a230cb
GS
445 cx->blk_loop.label = PL_curcop->cop_label; \
446 cx->blk_loop.resetsp = s - PL_stack_base; \
79072805
LW
447 cx->blk_loop.redo_op = cLOOP->op_redoop; \
448 cx->blk_loop.next_op = cLOOP->op_nextop; \
449 cx->blk_loop.last_op = cLOOP->op_lastop; \
a0714e2c 450 cx->blk_loop.iterlval = NULL; \
7d49f689 451 cx->blk_loop.iterary = NULL; \
7766f137
GS
452 cx->blk_loop.iterix = -1; \
453 CX_ITERDATA_SET(cx,dat);
79072805
LW
454
455#define POPLOOP(cx) \
a8bba7fa 456 SvREFCNT_dec(cx->blk_loop.iterlval); \
7766f137 457 if (CxITERVAR(cx)) { \
21401c75 458 if (SvPADMY(cx->blk_loop.itersave)) { \
d4c19fe8 459 SV ** const s_v_p = CxITERVAR(cx); \
21401c75
CH
460 sv_2mortal(*s_v_p); \
461 *s_v_p = cx->blk_loop.itersave; \
462 } \
463 else { \
464 SvREFCNT_dec(cx->blk_loop.itersave); \
465 } \
44a8e56a 466 } \
a8bba7fa
GS
467 if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\
468 SvREFCNT_dec(cx->blk_loop.iterary);
79072805 469
0d863452
RH
470/* given/when context */
471struct block_givwhen {
472 OP *leave_op;
473};
474
475#define PUSHGIVEN(cx) \
476 cx->blk_givwhen.leave_op = cLOGOP->op_other;
477
478#define PUSHWHEN PUSHGIVEN
479
79072805
LW
480/* context common to subroutines, evals and loops */
481struct block {
2e0df0e8
NC
482 U16 blku_type; /* what kind of context this is */
483 U8 blku_gimme; /* is this block running in list context? */
79072805
LW
484 I32 blku_oldsp; /* stack pointer to copy stuff down to */
485 COP * blku_oldcop; /* old curcop pointer */
79072805
LW
486 I32 blku_oldmarksp; /* mark stack index */
487 I32 blku_oldscopesp; /* scope stack index */
488 PMOP * blku_oldpm; /* values of pattern match vars */
79072805
LW
489
490 union {
491 struct block_sub blku_sub;
492 struct block_eval blku_eval;
493 struct block_loop blku_loop;
0d863452 494 struct block_givwhen blku_givwhen;
79072805
LW
495 } blk_u;
496};
497#define blk_oldsp cx_u.cx_blk.blku_oldsp
498#define blk_oldcop cx_u.cx_blk.blku_oldcop
79072805
LW
499#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
500#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
501#define blk_oldpm cx_u.cx_blk.blku_oldpm
502#define blk_gimme cx_u.cx_blk.blku_gimme
503#define blk_sub cx_u.cx_blk.blk_u.blku_sub
504#define blk_eval cx_u.cx_blk.blk_u.blku_eval
505#define blk_loop cx_u.cx_blk.blk_u.blku_loop
0d863452 506#define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen
79072805
LW
507
508/* Enter a block. */
8990e307 509#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805 510 cx->cx_type = t, \
3280af22
NIS
511 cx->blk_oldsp = sp - PL_stack_base, \
512 cx->blk_oldcop = PL_curcop, \
1aff0e91 513 cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
3280af22 514 cx->blk_oldscopesp = PL_scopestack_ix, \
3280af22 515 cx->blk_oldpm = PL_curpm, \
eb160463 516 cx->blk_gimme = (U8)gimme; \
bf49b057 517 DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
1aff0e91 518 (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
79072805
LW
519
520/* Exit a block (RETURN and LAST). */
a0d0e21e 521#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
1aff0e91 522 newsp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
523 PL_curcop = cx->blk_oldcop, \
524 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
525 PL_scopestack_ix = cx->blk_oldscopesp, \
3280af22
NIS
526 pm = cx->blk_oldpm, \
527 gimme = cx->blk_gimme; \
b4ab917c 528 DEBUG_SCOPE("POPBLOCK"); \
bf49b057 529 DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \
22c35a8c 530 (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
79072805
LW
531
532/* Continue a block elsewhere (NEXT and REDO). */
3280af22 533#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
1aff0e91 534 PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
535 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
536 PL_scopestack_ix = cx->blk_oldscopesp, \
b4ab917c
DM
537 PL_curpm = cx->blk_oldpm; \
538 DEBUG_SCOPE("TOPBLOCK");
79072805
LW
539
540/* substitution context */
541struct subst {
2e0df0e8
NC
542 U16 sbu_type; /* what kind of context this is */
543 bool sbu_once;
544 bool sbu_rxtainted;
79072805
LW
545 I32 sbu_iters;
546 I32 sbu_maxiters;
22e551b9 547 I32 sbu_rflags;
4633a7c4 548 I32 sbu_oldsave;
79072805
LW
549 char * sbu_orig;
550 SV * sbu_dstr;
551 SV * sbu_targ;
552 char * sbu_s;
553 char * sbu_m;
554 char * sbu_strend;
c90c0ff4 555 void * sbu_rxres;
c07a80fd 556 REGEXP * sbu_rx;
79072805
LW
557};
558#define sb_iters cx_u.cx_subst.sbu_iters
559#define sb_maxiters cx_u.cx_subst.sbu_maxiters
22e551b9 560#define sb_rflags cx_u.cx_subst.sbu_rflags
4633a7c4 561#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc
PP
562#define sb_once cx_u.cx_subst.sbu_once
563#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
79072805
LW
564#define sb_orig cx_u.cx_subst.sbu_orig
565#define sb_dstr cx_u.cx_subst.sbu_dstr
566#define sb_targ cx_u.cx_subst.sbu_targ
567#define sb_s cx_u.cx_subst.sbu_s
568#define sb_m cx_u.cx_subst.sbu_m
569#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4 570#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd 571#define sb_rx cx_u.cx_subst.sbu_rx
79072805
LW
572
573#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
574 cx->sb_iters = iters, \
575 cx->sb_maxiters = maxiters, \
22e551b9 576 cx->sb_rflags = r_flags, \
4633a7c4 577 cx->sb_oldsave = oldsave, \
71be2cbc
PP
578 cx->sb_once = once, \
579 cx->sb_rxtainted = rxtainted, \
79072805
LW
580 cx->sb_orig = orig, \
581 cx->sb_dstr = dstr, \
582 cx->sb_targ = targ, \
583 cx->sb_s = s, \
584 cx->sb_m = m, \
585 cx->sb_strend = strend, \
4608196e 586 cx->sb_rxres = NULL, \
c07a80fd 587 cx->sb_rx = rx, \
c90c0ff4 588 cx->cx_type = CXt_SUBST; \
e22ae1e2 589 rxres_save(&cx->sb_rxres, rx); \
b69b0499 590 (void)ReREFCNT_inc(rx)
79072805 591
c90c0ff4 592#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
e22ae1e2
DM
593 rxres_free(&cx->sb_rxres); \
594 ReREFCNT_dec(cx->sb_rx)
79072805
LW
595
596struct context {
79072805
LW
597 union {
598 struct block cx_blk;
599 struct subst cx_subst;
600 } cx_u;
601};
2e0df0e8 602#define cx_type cx_u.cx_subst.sbu_type
6b35e009
GS
603
604#define CXTYPEMASK 0xff
79072805
LW
605#define CXt_NULL 0
606#define CXt_SUB 1
607#define CXt_EVAL 2
608#define CXt_LOOP 3
609#define CXt_SUBST 4
610#define CXt_BLOCK 5
7766f137 611#define CXt_FORMAT 6
0d863452
RH
612#define CXt_GIVEN 7
613#define CXt_WHEN 8
79072805 614
9850bf21
RH
615/* private flags for CXt_SUB and CXt_NULL */
616#define CXp_MULTICALL 0x00000400 /* part of a multicall (so don't
617 tear down context on exit). */
618
6b35e009
GS
619/* private flags for CXt_EVAL */
620#define CXp_REAL 0x00000100 /* truly eval'', not a lookalike */
1d76a5c3 621#define CXp_TRYBLOCK 0x00000200 /* eval{}, not eval'' or similar */
6b35e009 622
7766f137 623/* private flags for CXt_LOOP */
0d863452
RH
624#define CXp_FOREACH 0x00000200 /* a foreach loop */
625#define CXp_FOR_DEF 0x00000400 /* foreach using $_ */
626#ifdef USE_ITHREADS
7766f137
GS
627# define CXp_PADVAR 0x00000100 /* itervar lives on pad, iterdata
628 has pad offset; if not set,
629 iterdata holds GV* */
630# define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \
631 == (CXt_LOOP|CXp_PADVAR))
632#endif
633
6b35e009 634#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
9850bf21
RH
635#define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
636 == CXp_MULTICALL)
7766f137
GS
637#define CxREALEVAL(c) (((c)->cx_type & (CXt_EVAL|CXp_REAL)) \
638 == (CXt_EVAL|CXp_REAL))
1d76a5c3
GS
639#define CxTRYBLOCK(c) (((c)->cx_type & (CXt_EVAL|CXp_TRYBLOCK)) \
640 == (CXt_EVAL|CXp_TRYBLOCK))
0d863452
RH
641#define CxFOREACH(c) (((c)->cx_type & (CXt_LOOP|CXp_FOREACH)) \
642 == (CXt_LOOP|CXp_FOREACH))
643#define CxFOREACHDEF(c) (((c)->cx_type & (CXt_LOOP|CXp_FOREACH|CXp_FOR_DEF))\
644 == (CXt_LOOP|CXp_FOREACH|CXp_FOR_DEF))
6b35e009 645
79072805
LW
646#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
647
ccfc67b7
JH
648/*
649=head1 "Gimme" Values
650*/
954c1994
GS
651
652/*
653=for apidoc AmU||G_SCALAR
654Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and
655L<perlcall>.
656
657=for apidoc AmU||G_ARRAY
91e74348 658Used to indicate list context. See C<GIMME_V>, C<GIMME> and
954c1994
GS
659L<perlcall>.
660
661=for apidoc AmU||G_VOID
662Used to indicate void context. See C<GIMME_V> and L<perlcall>.
663
664=for apidoc AmU||G_DISCARD
665Indicates that arguments returned from a callback should be discarded. See
666L<perlcall>.
667
668=for apidoc AmU||G_EVAL
669
670Used to force a Perl C<eval> wrapper around a callback. See
671L<perlcall>.
672
673=for apidoc AmU||G_NOARGS
674
675Indicates that no arguments are being sent to a callback. See
676L<perlcall>.
677
678=cut
679*/
680
a0d0e21e
LW
681#define G_SCALAR 0
682#define G_ARRAY 1
54310121 683#define G_VOID 128 /* skip this bit when adding flags below */
79072805 684
864dbfa3 685/* extra flags for Perl_call_* routines */
a0d0e21e
LW
686#define G_DISCARD 2 /* Call FREETMPS. */
687#define G_EVAL 4 /* Assume eval {} around subroutine call. */
688#define G_NOARGS 8 /* Don't construct a @_ array. */
54310121 689#define G_KEEPERR 16 /* Append errors to $@, don't overwrite it */
491527d0 690#define G_NODEBUG 32 /* Disable debugging at toplevel. */
968b3946 691#define G_METHOD 64 /* Calling method. */
edb2152a
NC
692#define G_FAKINGEVAL 256 /* Faking en eval context for call_sv or
693 fold_constants. */
e336de0d 694
faef0170
HS
695/* flag bits for PL_in_eval */
696#define EVAL_NULL 0 /* not in an eval */
697#define EVAL_INEVAL 1 /* some enclosing scope is an eval */
698#define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
864dbfa3 699#define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
6dc8a9e4 700#define EVAL_INREQUIRE 8 /* The code is being required. */
faef0170 701
e336de0d
GS
702/* Support for switching (stack and block) contexts.
703 * This ensures magic doesn't invalidate local stack and cx pointers.
704 */
705
e788e7d3
GS
706#define PERLSI_UNKNOWN -1
707#define PERLSI_UNDEF 0
708#define PERLSI_MAIN 1
709#define PERLSI_MAGIC 2
710#define PERLSI_SORT 3
711#define PERLSI_SIGNAL 4
712#define PERLSI_OVERLOAD 5
713#define PERLSI_DESTROY 6
714#define PERLSI_WARNHOOK 7
715#define PERLSI_DIEHOOK 8
716#define PERLSI_REQUIRE 9
e336de0d
GS
717
718struct stackinfo {
719 AV * si_stack; /* stack for current runlevel */
720 PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
721 I32 si_cxix; /* current context index */
722 I32 si_cxmax; /* maximum allocated index */
723 I32 si_type; /* type of runlevel */
724 struct stackinfo * si_prev;
725 struct stackinfo * si_next;
ce2f7c3b 726 I32 si_markoff; /* offset where markstack begins for us.
e336de0d
GS
727 * currently used only with DEBUGGING,
728 * but not #ifdef-ed for bincompat */
729};
730
731typedef struct stackinfo PERL_SI;
732
3280af22
NIS
733#define cxstack (PL_curstackinfo->si_cxstack)
734#define cxstack_ix (PL_curstackinfo->si_cxix)
735#define cxstack_max (PL_curstackinfo->si_cxmax)
e336de0d
GS
736
737#ifdef DEBUGGING
ce2f7c3b
GS
738# define SET_MARK_OFFSET \
739 PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
e336de0d 740#else
ce2f7c3b 741# define SET_MARK_OFFSET NOOP
e336de0d
GS
742#endif
743
d3acc0f7 744#define PUSHSTACKi(type) \
e336de0d 745 STMT_START { \
3280af22 746 PERL_SI *next = PL_curstackinfo->si_next; \
e336de0d
GS
747 if (!next) { \
748 next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
3280af22
NIS
749 next->si_prev = PL_curstackinfo; \
750 PL_curstackinfo->si_next = next; \
e336de0d
GS
751 } \
752 next->si_type = type; \
753 next->si_cxix = -1; \
754 AvFILLp(next->si_stack) = 0; \
3280af22
NIS
755 SWITCHSTACK(PL_curstack,next->si_stack); \
756 PL_curstackinfo = next; \
ce2f7c3b 757 SET_MARK_OFFSET; \
e336de0d
GS
758 } STMT_END
759
e788e7d3 760#define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
d3acc0f7 761
3095d977
GS
762/* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
763 * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
d3acc0f7 764#define POPSTACK \
e336de0d 765 STMT_START { \
39644a26 766 dSP; \
c4420975 767 PERL_SI * const prev = PL_curstackinfo->si_prev; \
e336de0d 768 if (!prev) { \
bf49b057 769 PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \
e336de0d
GS
770 my_exit(1); \
771 } \
3280af22 772 SWITCHSTACK(PL_curstack,prev->si_stack); \
e336de0d 773 /* don't free prev here, free them all at the END{} */ \
3280af22 774 PL_curstackinfo = prev; \
e336de0d
GS
775 } STMT_END
776
777#define POPSTACK_TO(s) \
778 STMT_START { \
3280af22 779 while (PL_curstack != s) { \
bac4b2ad 780 dounwind(-1); \
d3acc0f7 781 POPSTACK; \
bac4b2ad 782 } \
e336de0d 783 } STMT_END
923e4eb5
JH
784
785#define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
786#define IN_PERL_RUNTIME (PL_curcop != &PL_compiling)
787
9850bf21
RH
788/*
789=head1 Multicall Functions
790
791=for apidoc Ams||dMULTICALL
792Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>.
793
794=for apidoc Ams||PUSH_MULTICALL
795Opening bracket for a lightweight callback.
796See L<perlcall/Lightweight Callbacks>.
797
798=for apidoc Ams||MULTICALL
799Make a lightweight callback. See L<perlcall/Lightweight Callbacks>.
800
801=for apidoc Ams||POP_MULTICALL
802Closing bracket for a lightweight callback.
803See L<perlcall/Lightweight Callbacks>.
804
805=cut
806*/
807
808#define dMULTICALL \
809 SV **newsp; /* set by POPBLOCK */ \
810 PERL_CONTEXT *cx; \
82f35e8b 811 CV *multicall_cv; \
9850bf21
RH
812 OP *multicall_cop; \
813 bool multicall_oldcatch; \
814 U8 hasargs = 0 /* used by PUSHSUB */
815
82f35e8b 816#define PUSH_MULTICALL(the_cv) \
9850bf21 817 STMT_START { \
0bcc34c2
AL
818 CV * const _nOnclAshIngNamE_ = the_cv; \
819 CV * const cv = _nOnclAshIngNamE_; \
820 AV * const padlist = CvPADLIST(cv); \
9850bf21
RH
821 ENTER; \
822 multicall_oldcatch = CATCH_GET; \
823 SAVETMPS; SAVEVPTR(PL_op); \
824 CATCH_SET(TRUE); \
825 PUSHBLOCK(cx, CXt_SUB|CXp_MULTICALL, PL_stack_sp); \
826 PUSHSUB(cx); \
827 if (++CvDEPTH(cv) >= 2) { \
828 PERL_STACK_OVERFLOW_CHECK(); \
829 Perl_pad_push(aTHX_ padlist, CvDEPTH(cv)); \
830 } \
831 SAVECOMPPAD(); \
832 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv)); \
82f35e8b 833 multicall_cv = cv; \
9850bf21
RH
834 multicall_cop = CvSTART(cv); \
835 } STMT_END
836
837#define MULTICALL \
838 STMT_START { \
839 PL_op = multicall_cop; \
840 CALLRUNOPS(aTHX); \
841 } STMT_END
842
843#define POP_MULTICALL \
844 STMT_START { \
82f35e8b
RH
845 LEAVESUB(multicall_cv); \
846 CvDEPTH(multicall_cv)--; \
9850bf21
RH
847 POPBLOCK(cx,PL_curpm); \
848 CATCH_SET(multicall_oldcatch); \
849 LEAVE; \
850 } STMT_END
b3ca2e83
NC
851
852/*
853 * Local variables:
854 * c-indentation-style: bsd
855 * c-basic-offset: 4
856 * indent-tabs-mode: t
857 * End:
858 *
859 * ex: set ts=8 sts=4 sw=4 noet:
860 */