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PL_defoutgv isn't always a GV.
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a0d0e21e 1/* cop.h
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
8622e0e2 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
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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 *
8622e0e2
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9 * Control ops (cops) are one of the two ops OP_NEXTSTATE and OP_DBSTATE,
10 * that (loosely speaking) are separate statements.
3ffa1527
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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
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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 { \
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102 DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p at %s:%d\n", \
103 (void*)&cur_env, (void*)PL_top_env, \
104 __FILE__, __LINE__)); \
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105 cur_env.je_prev = PL_top_env; \
106 OP_REG_TO_MEM; \
107 cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK); \
108 OP_MEM_TO_REG; \
109 PL_top_env = &cur_env; \
110 cur_env.je_mustcatch = FALSE; \
111 (v) = cur_env.je_ret; \
112 } STMT_END
113
114#define JMPENV_POP \
115 STMT_START { \
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116 DEBUG_l(Perl_deb(aTHX_ "popping jumplevel was %p, now %p at %s:%d\n", \
117 (void*)PL_top_env, (void*)cur_env.je_prev, \
118 __FILE__, __LINE__)); \
d3ab86be 119 assert(PL_top_env == &cur_env); \
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120 PL_top_env = cur_env.je_prev; \
121 } STMT_END
122
123#define JMPENV_JUMP(v) \
124 STMT_START { \
125 OP_REG_TO_MEM; \
126 if (PL_top_env->je_prev) \
127 PerlProc_longjmp(PL_top_env->je_buf, (v)); \
128 if ((v) == 2) \
37038d91 129 PerlProc_exit(STATUS_EXIT); \
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130 PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \
131 PerlProc_exit(1); \
132 } STMT_END
133
134#define CATCH_GET (PL_top_env->je_mustcatch)
135#define CATCH_SET(v) (PL_top_env->je_mustcatch = (v))
136
137
5ac1e9b2 138#include "mydtrace.h"
0d2925a6 139
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140struct cop {
141 BASEOP
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142 /* On LP64 putting this here takes advantage of the fact that BASEOP isn't
143 an exact multiple of 8 bytes to save structure padding. */
144 line_t cop_line; /* line # of this command */
dca6062a 145 /* label for this construct is now stored in cop_hints_hash */
57843af0 146#ifdef USE_ITHREADS
11faa288 147 char * cop_stashpv; /* package line was compiled in */
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148 char * cop_file; /* file name the following line # is from */
149#else
11faa288 150 HV * cop_stash; /* package line was compiled in */
79072805 151 GV * cop_filegv; /* file the following line # is from */
57843af0 152#endif
d5ec2987 153 U32 cop_hints; /* hints bits from pragmata */
a0d0e21e 154 U32 cop_seq; /* parse sequence number */
72dc9ed5
NC
155 /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *: */
156 STRLEN * cop_warnings; /* lexical warnings bitmask */
b3ca2e83
NC
157 /* compile time state of %^H. See the comment in op.c for how this is
158 used to recreate a hash to return from caller. */
c28fe1ec 159 struct refcounted_he * cop_hints_hash;
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160};
161
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162#ifdef USE_ITHREADS
163# define CopFILE(c) ((c)->cop_file)
164# define CopFILEGV(c) (CopFILE(c) \
a0714e2c 165 ? gv_fetchfile(CopFILE(c)) : NULL)
083fcd59 166
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167# ifdef NETWARE
168# define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv))
d9095cec 169# define CopFILE_setn(c,pv,l) ((c)->cop_file = savepv((pv),(l)))
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170# else
171# define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv))
d9095cec 172# define CopFILE_setn(c,pv,l) ((c)->cop_file = savesharedpvn((pv),(l)))
7e4e8c89 173# endif
083fcd59 174
57843af0 175# define CopFILESV(c) (CopFILE(c) \
a0714e2c 176 ? GvSV(gv_fetchfile(CopFILE(c))) : NULL)
57843af0 177# define CopFILEAV(c) (CopFILE(c) \
7d49f689 178 ? GvAV(gv_fetchfile(CopFILE(c))) : NULL)
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179# ifdef DEBUGGING
180# define CopFILEAVx(c) (assert(CopFILE(c)), \
36c7798d 181 GvAV(gv_fetchfile(CopFILE(c))))
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182# else
183# define CopFILEAVx(c) (GvAV(gv_fetchfile(CopFILE(c))))
184# endif
57843af0 185# define CopSTASHPV(c) ((c)->cop_stashpv)
083fcd59 186
7e4e8c89 187# ifdef NETWARE
bd61b366 188# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : NULL))
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189# else
190# define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv))
191# endif
083fcd59 192
11faa288 193# define CopSTASH(c) (CopSTASHPV(c) \
5c284bb0 194 ? gv_stashpv(CopSTASHPV(c),GV_ADD) : NULL)
bd61b366 195# define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME_get(hv) : NULL)
ed221c57 196# define CopSTASH_eq(c,hv) ((hv) && stashpv_hvname_match(c,hv))
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197# ifdef NETWARE
198# define CopSTASH_free(c) SAVECOPSTASH_FREE(c)
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199# define CopFILE_free(c) SAVECOPFILE_FREE(c)
200# else
ed221c57 201# define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c))
bd61b366 202# define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
7e4e8c89 203# endif
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204#else
205# define CopFILEGV(c) ((c)->cop_filegv)
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206# define CopFILEGV_set(c,gv) ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv))
207# define CopFILE_set(c,pv) CopFILEGV_set((c), gv_fetchfile(pv))
d9095cec 208# define CopFILE_setn(c,pv,l) CopFILEGV_set((c), gv_fetchfile_flags((pv),(l),0))
a0714e2c 209# define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL)
7d49f689 210# define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL)
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211# ifdef DEBUGGING
212# define CopFILEAVx(c) (assert(CopFILEGV(c)), GvAV(CopFILEGV(c)))
213# else
214# define CopFILEAVx(c) (GvAV(CopFILEGV(c)))
215# endif
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216# define CopFILE(c) (CopFILEGV(c) && GvSV(CopFILEGV(c)) \
217 ? SvPVX(GvSV(CopFILEGV(c))) : NULL)
57843af0 218# define CopSTASH(c) ((c)->cop_stash)
f4dd75d9 219# define CopSTASH_set(c,hv) ((c)->cop_stash = (hv))
bd61b366 220# define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
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221 /* cop_stash is not refcounted */
222# define CopSTASHPV_set(c,pv) CopSTASH_set((c), gv_stashpv(pv,GV_ADD))
223# define CopSTASH_eq(c,hv) (CopSTASH(c) == (hv))
05ec9bb3 224# define CopSTASH_free(c)
a0714e2c 225# define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))
05ec9bb3 226
57843af0 227#endif /* USE_ITHREADS */
dca6062a
NC
228#define CopLABEL(c) Perl_fetch_cop_label(aTHX_ (c)->cop_hints_hash, NULL, NULL)
229#define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)
57843af0 230
ed094faf 231#define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv))
cc49e20b 232#define CopLINE(c) ((c)->cop_line)
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233#define CopLINE_inc(c) (++CopLINE(c))
234#define CopLINE_dec(c) (--CopLINE(c))
235#define CopLINE_set(c,l) (CopLINE(c) = (l))
cc49e20b 236
248c2a4d 237/* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */
e37778c2 238#define OutCopFILE(c) CopFILE(c)
248c2a4d 239
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NC
240/* If $[ is non-zero, it's stored in cop_hints under the key "$[", and
241 HINT_ARYBASE is set to indicate this.
242 Setting it is ineficient due to the need to create 2 mortal SVs, but as
243 using $[ is highly discouraged, no sane Perl code will be using it. */
244#define CopARYBASE_get(c) \
245 ((CopHINTS_get(c) & HINT_ARYBASE) \
c28fe1ec
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246 ? SvIV(Perl_refcounted_he_fetch(aTHX_ (c)->cop_hints_hash, 0, \
247 "$[", 2, 0, 0)) \
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248 : 0)
249#define CopARYBASE_set(c, b) STMT_START { \
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250 if (b || ((c)->cop_hints & HINT_ARYBASE)) { \
251 (c)->cop_hints |= HINT_ARYBASE; \
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252 if ((c) == &PL_compiling) { \
253 SV *val = newSViv(b); \
254 (void)hv_stores(GvHV(PL_hintgv), "$[", val); \
255 mg_set(val); \
256 PL_hints |= HINT_ARYBASE; \
257 } else { \
258 (c)->cop_hints_hash \
259 = Perl_refcounted_he_new(aTHX_ (c)->cop_hints_hash, \
84bafc02 260 newSVpvs_flags("$[", SVs_TEMP), \
7b0bddfa 261 sv_2mortal(newSViv(b))); \
f747ebd6 262 } \
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NC
263 } \
264 } STMT_END
fc15ae8f 265
623e6609 266/* FIXME NATIVE_HINTS if this is changed from op_private (see perl.h) */
d5ec2987 267#define CopHINTS_get(c) ((c)->cop_hints + 0)
623e6609 268#define CopHINTS_set(c, h) STMT_START { \
d5ec2987 269 (c)->cop_hints = (h); \
623e6609
NC
270 } STMT_END
271
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272/*
273 * Here we have some enormously heavy (or at least ponderous) wizardry.
274 */
275
276/* subroutine context */
277struct block_sub {
f9c764c5 278 OP * retop; /* op to execute on exit from sub */
8e663997
NC
279 /* Above here is the same for sub, format and eval. */
280 CV * cv;
f9c764c5 281 /* Above here is the same for sub and format. */
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282 AV * savearray;
283 AV * argarray;
bb172083 284 I32 olddepth;
f3548bdc 285 PAD *oldcomppad;
f9c764c5
NC
286};
287
288
289/* format context */
290struct block_format {
f39bc417 291 OP * retop; /* op to execute on exit from sub */
8e663997
NC
292 /* Above here is the same for sub, format and eval. */
293 CV * cv;
f9c764c5
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294 /* Above here is the same for sub and format. */
295 GV * gv;
296 GV * dfoutgv;
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297};
298
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DM
299/* base for the next two macros. Don't use directly.
300 * Note that the refcnt of the cv is incremented twice; The CX one is
301 * decremented by LEAVESUB, the other by LEAVE. */
302
ee98a1d6 303#define PUSHSUB_BASE(cx) \
5ac1e9b2 304 ENTRY_PROBE(GvENAME(CvGV(cv)), \
c6903450
NC
305 CopFILE((const COP *)CvSTART(cv)), \
306 CopLINE((const COP *)CvSTART(cv))); \
5ac1e9b2 307 \
79072805 308 cx->blk_sub.cv = cv; \
b8f55b69 309 cx->blk_sub.olddepth = CvDEPTH(cv); \
ae423868 310 cx->cx_type |= (hasargs) ? CXp_HASARGS : 0; \
5f66b61c 311 cx->blk_sub.retop = NULL; \
b36bdeca 312 if (!CvDEPTH(cv)) { \
74c765eb
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313 SvREFCNT_inc_simple_void_NN(cv); \
314 SvREFCNT_inc_simple_void_NN(cv); \
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DM
315 SAVEFREESV(cv); \
316 }
317
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DM
318
319#define PUSHSUB(cx) \
320 PUSHSUB_BASE(cx) \
446d0787 321 cx->blk_u16 = PL_op->op_private & \
cc8d50a7 322 (OPpLVAL_INTRO|OPpENTERSUB_INARGS);
79072805 323
ee98a1d6
DM
324/* variant for use by OP_DBSTATE, where op_private holds hint bits */
325#define PUSHSUB_DB(cx) \
326 PUSHSUB_BASE(cx) \
446d0787 327 cx->blk_u16 = 0;
ee98a1d6
DM
328
329
10067d9a 330#define PUSHFORMAT(cx, retop) \
f9c764c5
NC
331 cx->blk_format.cv = cv; \
332 cx->blk_format.gv = gv; \
333 cx->blk_format.retop = (retop); \
f9c764c5
NC
334 cx->blk_format.dfoutgv = PL_defoutgv; \
335 SvREFCNT_inc_void(cx->blk_format.dfoutgv)
79072805 336
3db8f154 337#define POP_SAVEARRAY() \
6d4ff0d2 338 STMT_START { \
3280af22 339 SvREFCNT_dec(GvAV(PL_defgv)); \
a8bba7fa 340 GvAV(PL_defgv) = cx->blk_sub.savearray; \
6d4ff0d2 341 } STMT_END
6d4ff0d2 342
ecf8e9dd 343/* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
8e09340b
GS
344 * leave any (a fast av_clear(ary), basically) */
345#define CLEAR_ARGARRAY(ary) \
346 STMT_START { \
347 AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \
9c6bc640 348 AvARRAY(ary) = AvALLOC(ary); \
8e09340b
GS
349 AvFILLp(ary) = -1; \
350 } STMT_END
7766f137 351
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GS
352#define POPSUB(cx,sv) \
353 STMT_START { \
8f629a87
NC
354 RETURN_PROBE(GvENAME(CvGV((const CV*)cx->blk_sub.cv)), \
355 CopFILE((COP*)CvSTART((const CV*)cx->blk_sub.cv)), \
356 CopLINE((COP*)CvSTART((const CV*)cx->blk_sub.cv))); \
5ac1e9b2 357 \
bafb2adc 358 if (CxHASARGS(cx)) { \
7766f137 359 POP_SAVEARRAY(); \
d8b46c1b 360 /* abandon @_ if it got reified */ \
a8bba7fa 361 if (AvREAL(cx->blk_sub.argarray)) { \
e2d306cb 362 const SSize_t fill = AvFILLp(cx->blk_sub.argarray); \
a8bba7fa
GS
363 SvREFCNT_dec(cx->blk_sub.argarray); \
364 cx->blk_sub.argarray = newAV(); \
365 av_extend(cx->blk_sub.argarray, fill); \
11ca45c0 366 AvREIFY_only(cx->blk_sub.argarray); \
b1bc3f34 367 CX_CURPAD_SV(cx->blk_sub, 0) = MUTABLE_SV(cx->blk_sub.argarray); \
d8b46c1b 368 } \
7766f137 369 else { \
8e09340b 370 CLEAR_ARGARRAY(cx->blk_sub.argarray); \
7766f137 371 } \
79072805 372 } \
b1bc3f34 373 sv = MUTABLE_SV(cx->blk_sub.cv); \
8f629a87 374 if (sv && (CvDEPTH((const CV*)sv) = cx->blk_sub.olddepth)) \
a0714e2c 375 sv = NULL; \
b0d9ce38
GS
376 } STMT_END
377
378#define LEAVESUB(sv) \
379 STMT_START { \
380 if (sv) \
381 SvREFCNT_dec(sv); \
382 } STMT_END
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383
384#define POPFORMAT(cx) \
f9c764c5
NC
385 setdefout(cx->blk_format.dfoutgv); \
386 SvREFCNT_dec(cx->blk_format.dfoutgv);
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387
388/* eval context */
389struct block_eval {
8e663997
NC
390 OP * retop; /* op to execute on exit from eval */
391 /* Above here is the same for sub, format and eval. */
0f79a09d 392 SV * old_namesv;
79072805 393 OP * old_eval_root;
748a9306 394 SV * cur_text;
2090ab20 395 CV * cv;
abd70938 396 JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
79072805
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397};
398
17347a51
NC
399/* If we ever need more than 512 op types, change the shift from 7.
400 blku_gimme is actually also only 2 bits, so could be merged with something.
401*/
402
403#define CxOLD_IN_EVAL(cx) (((cx)->blk_u16) & 0x7F)
404#define CxOLD_OP_TYPE(cx) (((cx)->blk_u16) >> 7)
85a64632 405
6b75f042 406#define PUSHEVAL(cx,n) \
0f79a09d 407 STMT_START { \
17347a51
NC
408 assert(!(PL_in_eval & ~0x7F)); \
409 assert(!(PL_op->op_type & ~0x1FF)); \
410 cx->blk_u16 = (PL_in_eval & 0x7F) | ((U16)PL_op->op_type << 7); \
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
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418
419#define POPEVAL(cx) \
0f79a09d 420 STMT_START { \
85a64632
NC
421 PL_in_eval = CxOLD_IN_EVAL(cx); \
422 optype = CxOLD_OP_TYPE(cx); \
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 434#ifdef USE_ITHREADS
e846cb92
NC
435 PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
436 /* This is also accesible via cx->blk_loop.my_op->op_targ */
437 PADOFFSET targoffset;
7766f137 438#else
022eaa24 439 OP * next_op;
79072805 440 SV ** itervar;
7766f137 441#endif
493b0a3c 442 union {
d01136d6
BS
443 struct { /* valid if type is LOOP_FOR or LOOP_PLAIN (but {NULL,0})*/
444 AV * ary; /* use the stack if this is NULL */
445 IV ix;
446 } ary;
447 struct { /* valid if type is LOOP_LAZYIV */
448 IV cur;
449 IV end;
450 } lazyiv;
451 struct { /* valid if type if LOOP_LAZYSV */
452 SV * cur;
453 SV * end; /* maxiumum value (or minimum in reverse) */
454 } lazysv;
455 } state_u;
79072805
LW
456};
457
7766f137
GS
458#ifdef USE_ITHREADS
459# define CxITERVAR(c) \
e846cb92
NC
460 ((c)->blk_loop.oldcomppad \
461 ? (CxPADLOOP(c) \
462 ? &CX_CURPAD_SV( (c)->blk_loop, (c)->blk_loop.targoffset ) \
463 : &GvSV((GV*)(c)->blk_loop.oldcomppad)) \
7766f137 464 : (SV**)NULL)
e846cb92
NC
465# define CX_ITERDATA_SET(cx,idata,o) \
466 if ((cx->blk_loop.targoffset = (o))) \
467 CX_CURPAD_SAVE(cx->blk_loop); \
468 else \
469 cx->blk_loop.oldcomppad = (idata);
7766f137
GS
470#else
471# define CxITERVAR(c) ((c)->blk_loop.itervar)
e846cb92 472# define CX_ITERDATA_SET(cx,ivar,o) \
09edbca0 473 cx->blk_loop.itervar = (SV**)(ivar);
7766f137 474#endif
b1cf8b36 475#define CxLABEL(c) (0 + CopLABEL((c)->blk_oldcop))
ae423868 476#define CxHASARGS(c) (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
446d0787 477#define CxLVAL(c) (0 + (c)->blk_u16)
7766f137 478
022eaa24
NC
479#ifdef USE_ITHREADS
480# define PUSHLOOP_OP_NEXT /* No need to do anything. */
481# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.my_op->op_nextop + 0)
482#else
483# define PUSHLOOP_OP_NEXT cx->blk_loop.next_op = cLOOP->op_nextop
484# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.next_op + 0)
485#endif
486
3b719c58
NC
487#define PUSHLOOP_PLAIN(cx, s) \
488 cx->blk_loop.resetsp = s - PL_stack_base; \
489 cx->blk_loop.my_op = cLOOP; \
490 PUSHLOOP_OP_NEXT; \
d01136d6
BS
491 cx->blk_loop.state_u.ary.ary = NULL; \
492 cx->blk_loop.state_u.ary.ix = 0; \
e846cb92 493 CX_ITERDATA_SET(cx, NULL, 0);
3b719c58 494
e846cb92 495#define PUSHLOOP_FOR(cx, dat, s, offset) \
38a230cb 496 cx->blk_loop.resetsp = s - PL_stack_base; \
022eaa24
NC
497 cx->blk_loop.my_op = cLOOP; \
498 PUSHLOOP_OP_NEXT; \
d01136d6
BS
499 cx->blk_loop.state_u.ary.ary = NULL; \
500 cx->blk_loop.state_u.ary.ix = 0; \
e846cb92 501 CX_ITERDATA_SET(cx, dat, offset);
79072805
LW
502
503#define POPLOOP(cx) \
d01136d6
BS
504 if (CxTYPE(cx) == CXt_LOOP_LAZYSV) { \
505 SvREFCNT_dec(cx->blk_loop.state_u.lazysv.cur); \
506 SvREFCNT_dec(cx->blk_loop.state_u.lazysv.end); \
507 } \
d01136d6
BS
508 if (CxTYPE(cx) == CXt_LOOP_FOR) \
509 SvREFCNT_dec(cx->blk_loop.state_u.ary.ary);
79072805 510
0d863452
RH
511/* given/when context */
512struct block_givwhen {
513 OP *leave_op;
514};
515
516#define PUSHGIVEN(cx) \
517 cx->blk_givwhen.leave_op = cLOGOP->op_other;
518
519#define PUSHWHEN PUSHGIVEN
520
79072805
LW
521/* context common to subroutines, evals and loops */
522struct block {
446d0787 523 U8 blku_type; /* what kind of context this is */
2e0df0e8 524 U8 blku_gimme; /* is this block running in list context? */
17347a51 525 U16 blku_u16; /* used by block_sub and block_eval (so far) */
79072805
LW
526 I32 blku_oldsp; /* stack pointer to copy stuff down to */
527 COP * blku_oldcop; /* old curcop pointer */
79072805
LW
528 I32 blku_oldmarksp; /* mark stack index */
529 I32 blku_oldscopesp; /* scope stack index */
530 PMOP * blku_oldpm; /* values of pattern match vars */
79072805
LW
531
532 union {
533 struct block_sub blku_sub;
f9c764c5 534 struct block_format blku_format;
79072805
LW
535 struct block_eval blku_eval;
536 struct block_loop blku_loop;
0d863452 537 struct block_givwhen blku_givwhen;
79072805
LW
538 } blk_u;
539};
540#define blk_oldsp cx_u.cx_blk.blku_oldsp
541#define blk_oldcop cx_u.cx_blk.blku_oldcop
79072805
LW
542#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
543#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
544#define blk_oldpm cx_u.cx_blk.blku_oldpm
545#define blk_gimme cx_u.cx_blk.blku_gimme
446d0787 546#define blk_u16 cx_u.cx_blk.blku_u16
79072805 547#define blk_sub cx_u.cx_blk.blk_u.blku_sub
f9c764c5 548#define blk_format cx_u.cx_blk.blk_u.blku_format
79072805
LW
549#define blk_eval cx_u.cx_blk.blk_u.blku_eval
550#define blk_loop cx_u.cx_blk.blk_u.blku_loop
0d863452 551#define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen
79072805
LW
552
553/* Enter a block. */
8990e307 554#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805 555 cx->cx_type = t, \
3280af22
NIS
556 cx->blk_oldsp = sp - PL_stack_base, \
557 cx->blk_oldcop = PL_curcop, \
1aff0e91 558 cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
3280af22 559 cx->blk_oldscopesp = PL_scopestack_ix, \
3280af22 560 cx->blk_oldpm = PL_curpm, \
eb160463 561 cx->blk_gimme = (U8)gimme; \
bf49b057 562 DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
1aff0e91 563 (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
79072805
LW
564
565/* Exit a block (RETURN and LAST). */
a0d0e21e 566#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
1aff0e91 567 newsp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
568 PL_curcop = cx->blk_oldcop, \
569 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
570 PL_scopestack_ix = cx->blk_oldscopesp, \
3280af22
NIS
571 pm = cx->blk_oldpm, \
572 gimme = cx->blk_gimme; \
b4ab917c 573 DEBUG_SCOPE("POPBLOCK"); \
bf49b057 574 DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \
22c35a8c 575 (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
79072805
LW
576
577/* Continue a block elsewhere (NEXT and REDO). */
3280af22 578#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
1aff0e91 579 PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
580 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
581 PL_scopestack_ix = cx->blk_oldscopesp, \
b4ab917c
DM
582 PL_curpm = cx->blk_oldpm; \
583 DEBUG_SCOPE("TOPBLOCK");
79072805
LW
584
585/* substitution context */
586struct subst {
446d0787 587 U8 sbu_type; /* what kind of context this is */
1ed74d04 588 U8 sbu_rflags;
446d0787 589 U16 sbu_rxtainted; /* matches struct block */
79072805
LW
590 I32 sbu_iters;
591 I32 sbu_maxiters;
4633a7c4 592 I32 sbu_oldsave;
79072805
LW
593 char * sbu_orig;
594 SV * sbu_dstr;
595 SV * sbu_targ;
596 char * sbu_s;
597 char * sbu_m;
598 char * sbu_strend;
c90c0ff4 599 void * sbu_rxres;
c07a80fd 600 REGEXP * sbu_rx;
79072805
LW
601};
602#define sb_iters cx_u.cx_subst.sbu_iters
603#define sb_maxiters cx_u.cx_subst.sbu_maxiters
22e551b9 604#define sb_rflags cx_u.cx_subst.sbu_rflags
4633a7c4 605#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc
PP
606#define sb_once cx_u.cx_subst.sbu_once
607#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
79072805
LW
608#define sb_orig cx_u.cx_subst.sbu_orig
609#define sb_dstr cx_u.cx_subst.sbu_dstr
610#define sb_targ cx_u.cx_subst.sbu_targ
611#define sb_s cx_u.cx_subst.sbu_s
612#define sb_m cx_u.cx_subst.sbu_m
613#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4 614#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd 615#define sb_rx cx_u.cx_subst.sbu_rx
79072805 616
9c105995
NC
617#ifdef PERL_CORE
618# define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
79072805
LW
619 cx->sb_iters = iters, \
620 cx->sb_maxiters = maxiters, \
22e551b9 621 cx->sb_rflags = r_flags, \
4633a7c4 622 cx->sb_oldsave = oldsave, \
71be2cbc 623 cx->sb_rxtainted = rxtainted, \
79072805
LW
624 cx->sb_orig = orig, \
625 cx->sb_dstr = dstr, \
626 cx->sb_targ = targ, \
627 cx->sb_s = s, \
628 cx->sb_m = m, \
629 cx->sb_strend = strend, \
4608196e 630 cx->sb_rxres = NULL, \
c07a80fd 631 cx->sb_rx = rx, \
1ed74d04 632 cx->cx_type = CXt_SUBST | (once ? CXp_ONCE : 0); \
e22ae1e2 633 rxres_save(&cx->sb_rxres, rx); \
b69b0499 634 (void)ReREFCNT_inc(rx)
79072805 635
9c105995 636# define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
e22ae1e2
DM
637 rxres_free(&cx->sb_rxres); \
638 ReREFCNT_dec(cx->sb_rx)
9c105995
NC
639#endif
640
641#define CxONCE(cx) ((cx)->cx_type & CXp_ONCE)
79072805
LW
642
643struct context {
79072805
LW
644 union {
645 struct block cx_blk;
646 struct subst cx_subst;
647 } cx_u;
648};
2e0df0e8 649#define cx_type cx_u.cx_subst.sbu_type
6b35e009 650
76753e7f
NC
651/* If you re-order these, there is also an array of uppercase names in perl.h
652 and a static array of context names in pp_ctl.c */
3701055e 653#define CXTYPEMASK 0xf
79072805 654#define CXt_NULL 0
76753e7f
NC
655#define CXt_WHEN 1
656#define CXt_BLOCK 2
657/* When micro-optimising :-) keep GIVEN next to the LOOPs, as these 5 share a
658 jump table in pp_ctl.c
659 The first 4 don't have a 'case' in at least one switch statement in pp_ctl.c
660*/
661#define CXt_GIVEN 3
c6fdafd0 662/* This is first so that CXt_LOOP_FOR|CXt_LOOP_LAZYIV is CXt_LOOP_LAZYIV */
76753e7f
NC
663#define CXt_LOOP_FOR 4
664#define CXt_LOOP_PLAIN 5
665#define CXt_LOOP_LAZYSV 6
666#define CXt_LOOP_LAZYIV 7
667#define CXt_SUB 8
668#define CXt_FORMAT 9
669#define CXt_EVAL 10
670#define CXt_SUBST 11
671/* SUBST doesn't feature in all switch statements. */
79072805 672
3701055e
NC
673/* private flags for CXt_SUB and CXt_NULL
674 However, this is checked in many places which do not check the type, so
675 this bit needs to be kept clear for most everything else. For reasons I
676 haven't investigated, it can coexist with CXp_FOR_DEF */
1f27d788
NC
677#define CXp_MULTICALL 0x10 /* part of a multicall (so don't
678 tear down context on exit). */
9850bf21 679
ae423868 680/* private flags for CXt_SUB and CXt_FORMAT */
1f27d788 681#define CXp_HASARGS 0x20
ae423868 682
6b35e009 683/* private flags for CXt_EVAL */
1f27d788
NC
684#define CXp_REAL 0x20 /* truly eval'', not a lookalike */
685#define CXp_TRYBLOCK 0x40 /* eval{}, not eval'' or similar */
6b35e009 686
7766f137 687/* private flags for CXt_LOOP */
1f27d788 688#define CXp_FOR_DEF 0x10 /* foreach using $_ */
0d863452 689#ifdef USE_ITHREADS
e846cb92 690# define CxPADLOOP(c) ((c)->blk_loop.targoffset)
7766f137 691#endif
e846cb92 692
1ed74d04
NC
693/* private flags for CXt_SUBST */
694#define CXp_ONCE 0x10 /* What was sbu_once in struct subst */
7766f137 695
6b35e009 696#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
76753e7f 697#define CxTYPE_is_LOOP(c) (((c)->cx_type & 0xC) == 0x4)
9850bf21
RH
698#define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
699 == CXp_MULTICALL)
0588a150 700#define CxREALEVAL(c) (((c)->cx_type & (CXTYPEMASK|CXp_REAL)) \
7766f137 701 == (CXt_EVAL|CXp_REAL))
0588a150 702#define CxTRYBLOCK(c) (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK)) \
1d76a5c3 703 == (CXt_EVAL|CXp_TRYBLOCK))
3b719c58
NC
704#define CxFOREACH(c) (CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN)
705#define CxFOREACHDEF(c) ((CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN) \
706 && ((c)->cx_type & CXp_FOR_DEF))
6b35e009 707
79072805
LW
708#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
709
ccfc67b7
JH
710/*
711=head1 "Gimme" Values
712*/
954c1994
GS
713
714/*
715=for apidoc AmU||G_SCALAR
716Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and
717L<perlcall>.
718
719=for apidoc AmU||G_ARRAY
91e74348 720Used to indicate list context. See C<GIMME_V>, C<GIMME> and
954c1994
GS
721L<perlcall>.
722
723=for apidoc AmU||G_VOID
724Used to indicate void context. See C<GIMME_V> and L<perlcall>.
725
726=for apidoc AmU||G_DISCARD
727Indicates that arguments returned from a callback should be discarded. See
728L<perlcall>.
729
730=for apidoc AmU||G_EVAL
731
732Used to force a Perl C<eval> wrapper around a callback. See
733L<perlcall>.
734
735=for apidoc AmU||G_NOARGS
736
737Indicates that no arguments are being sent to a callback. See
738L<perlcall>.
739
740=cut
741*/
742
2f8edad0
NC
743#define G_SCALAR 2
744#define G_ARRAY 3
745#define G_VOID 1
746#define G_WANT 3
79072805 747
864dbfa3 748/* extra flags for Perl_call_* routines */
2f8edad0 749#define G_DISCARD 4 /* Call FREETMPS.
b54b4831
NC
750 Don't change this without consulting the
751 hash actions codes defined in hv.h */
2f8edad0
NC
752#define G_EVAL 8 /* Assume eval {} around subroutine call. */
753#define G_NOARGS 16 /* Don't construct a @_ array. */
754#define G_KEEPERR 32 /* Append errors to $@, don't overwrite it */
755#define G_NODEBUG 64 /* Disable debugging at toplevel. */
756#define G_METHOD 128 /* Calling method. */
c40f1585 757#define G_FAKINGEVAL 256 /* Faking an eval context for call_sv or
edb2152a 758 fold_constants. */
e336de0d 759
faef0170
HS
760/* flag bits for PL_in_eval */
761#define EVAL_NULL 0 /* not in an eval */
762#define EVAL_INEVAL 1 /* some enclosing scope is an eval */
763#define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
864dbfa3 764#define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
6dc8a9e4 765#define EVAL_INREQUIRE 8 /* The code is being required. */
faef0170 766
e336de0d
GS
767/* Support for switching (stack and block) contexts.
768 * This ensures magic doesn't invalidate local stack and cx pointers.
769 */
770
e788e7d3
GS
771#define PERLSI_UNKNOWN -1
772#define PERLSI_UNDEF 0
773#define PERLSI_MAIN 1
774#define PERLSI_MAGIC 2
775#define PERLSI_SORT 3
776#define PERLSI_SIGNAL 4
777#define PERLSI_OVERLOAD 5
778#define PERLSI_DESTROY 6
779#define PERLSI_WARNHOOK 7
780#define PERLSI_DIEHOOK 8
781#define PERLSI_REQUIRE 9
e336de0d
GS
782
783struct stackinfo {
784 AV * si_stack; /* stack for current runlevel */
785 PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
9bd87817
NC
786 struct stackinfo * si_prev;
787 struct stackinfo * si_next;
e336de0d
GS
788 I32 si_cxix; /* current context index */
789 I32 si_cxmax; /* maximum allocated index */
790 I32 si_type; /* type of runlevel */
ce2f7c3b 791 I32 si_markoff; /* offset where markstack begins for us.
e336de0d
GS
792 * currently used only with DEBUGGING,
793 * but not #ifdef-ed for bincompat */
794};
795
796typedef struct stackinfo PERL_SI;
797
3280af22
NIS
798#define cxstack (PL_curstackinfo->si_cxstack)
799#define cxstack_ix (PL_curstackinfo->si_cxix)
800#define cxstack_max (PL_curstackinfo->si_cxmax)
e336de0d
GS
801
802#ifdef DEBUGGING
ce2f7c3b
GS
803# define SET_MARK_OFFSET \
804 PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
e336de0d 805#else
ce2f7c3b 806# define SET_MARK_OFFSET NOOP
e336de0d
GS
807#endif
808
d3acc0f7 809#define PUSHSTACKi(type) \
e336de0d 810 STMT_START { \
3280af22 811 PERL_SI *next = PL_curstackinfo->si_next; \
e336de0d
GS
812 if (!next) { \
813 next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
3280af22
NIS
814 next->si_prev = PL_curstackinfo; \
815 PL_curstackinfo->si_next = next; \
e336de0d
GS
816 } \
817 next->si_type = type; \
818 next->si_cxix = -1; \
819 AvFILLp(next->si_stack) = 0; \
3280af22
NIS
820 SWITCHSTACK(PL_curstack,next->si_stack); \
821 PL_curstackinfo = next; \
ce2f7c3b 822 SET_MARK_OFFSET; \
e336de0d
GS
823 } STMT_END
824
e788e7d3 825#define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
d3acc0f7 826
3095d977
GS
827/* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
828 * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
d3acc0f7 829#define POPSTACK \
e336de0d 830 STMT_START { \
39644a26 831 dSP; \
c4420975 832 PERL_SI * const prev = PL_curstackinfo->si_prev; \
e336de0d 833 if (!prev) { \
bf49b057 834 PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \
e336de0d
GS
835 my_exit(1); \
836 } \
3280af22 837 SWITCHSTACK(PL_curstack,prev->si_stack); \
e336de0d 838 /* don't free prev here, free them all at the END{} */ \
3280af22 839 PL_curstackinfo = prev; \
e336de0d
GS
840 } STMT_END
841
842#define POPSTACK_TO(s) \
843 STMT_START { \
3280af22 844 while (PL_curstack != s) { \
bac4b2ad 845 dounwind(-1); \
d3acc0f7 846 POPSTACK; \
bac4b2ad 847 } \
e336de0d 848 } STMT_END
923e4eb5
JH
849
850#define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
851#define IN_PERL_RUNTIME (PL_curcop != &PL_compiling)
852
9850bf21
RH
853/*
854=head1 Multicall Functions
855
856=for apidoc Ams||dMULTICALL
857Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>.
858
859=for apidoc Ams||PUSH_MULTICALL
860Opening bracket for a lightweight callback.
861See L<perlcall/Lightweight Callbacks>.
862
863=for apidoc Ams||MULTICALL
864Make a lightweight callback. See L<perlcall/Lightweight Callbacks>.
865
866=for apidoc Ams||POP_MULTICALL
867Closing bracket for a lightweight callback.
868See L<perlcall/Lightweight Callbacks>.
869
870=cut
871*/
872
873#define dMULTICALL \
874 SV **newsp; /* set by POPBLOCK */ \
875 PERL_CONTEXT *cx; \
82f35e8b 876 CV *multicall_cv; \
9850bf21
RH
877 OP *multicall_cop; \
878 bool multicall_oldcatch; \
879 U8 hasargs = 0 /* used by PUSHSUB */
880
82f35e8b 881#define PUSH_MULTICALL(the_cv) \
9850bf21 882 STMT_START { \
0bcc34c2
AL
883 CV * const _nOnclAshIngNamE_ = the_cv; \
884 CV * const cv = _nOnclAshIngNamE_; \
885 AV * const padlist = CvPADLIST(cv); \
9850bf21
RH
886 ENTER; \
887 multicall_oldcatch = CATCH_GET; \
888 SAVETMPS; SAVEVPTR(PL_op); \
889 CATCH_SET(TRUE); \
1bbbfc50 890 PUSHSTACKi(PERLSI_SORT); \
9850bf21
RH
891 PUSHBLOCK(cx, CXt_SUB|CXp_MULTICALL, PL_stack_sp); \
892 PUSHSUB(cx); \
893 if (++CvDEPTH(cv) >= 2) { \
894 PERL_STACK_OVERFLOW_CHECK(); \
895 Perl_pad_push(aTHX_ padlist, CvDEPTH(cv)); \
896 } \
897 SAVECOMPPAD(); \
898 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv)); \
82f35e8b 899 multicall_cv = cv; \
9850bf21
RH
900 multicall_cop = CvSTART(cv); \
901 } STMT_END
902
903#define MULTICALL \
904 STMT_START { \
905 PL_op = multicall_cop; \
906 CALLRUNOPS(aTHX); \
907 } STMT_END
908
909#define POP_MULTICALL \
910 STMT_START { \
82f35e8b
RH
911 LEAVESUB(multicall_cv); \
912 CvDEPTH(multicall_cv)--; \
9850bf21 913 POPBLOCK(cx,PL_curpm); \
1bbbfc50 914 POPSTACK; \
9850bf21
RH
915 CATCH_SET(multicall_oldcatch); \
916 LEAVE; \
1bbbfc50 917 SPAGAIN; \
9850bf21 918 } STMT_END
b3ca2e83
NC
919
920/*
921 * Local variables:
922 * c-indentation-style: bsd
923 * c-basic-offset: 4
924 * indent-tabs-mode: t
925 * End:
926 *
927 * ex: set ts=8 sts=4 sw=4 noet:
928 */