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A macro used only once isn't a typing saving, and 3 macro definitions
[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
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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 *
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
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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 { \
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)); \
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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); \
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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
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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 */
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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
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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))
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196# ifdef NETWARE
197# define CopSTASH_free(c) SAVECOPSTASH_FREE(c)
7e4e8c89 198# define CopFILE_free(c) SAVECOPFILE_FREE(c)
06f53df5 199# define CopLABEL_free(c) SAVESHAREDPV(CopLABEL(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)
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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)
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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
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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)
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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
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234#endif /* USE_ITHREADS */
235
ed094faf 236#define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv))
cc49e20b 237#define CopLINE(c) ((c)->cop_line)
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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
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257 : 0)
258#define CopARYBASE_set(c, b) STMT_START { \
d5ec2987
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259 if (b || ((c)->cop_hints & HINT_ARYBASE)) { \
260 (c)->cop_hints |= HINT_ARYBASE; \
7b0bddfa
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261 if ((c) == &PL_compiling) \
262 PL_hints |= HINT_LOCALIZE_HH | HINT_ARYBASE; \
c28fe1ec
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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 285 /* Above here is the same for sub and format. */
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286 AV * savearray;
287 AV * argarray;
bb172083 288 I32 olddepth;
f3548bdc 289 PAD *oldcomppad;
f9c764c5
NC
290};
291
292
293/* format context */
294struct block_format {
f39bc417 295 OP * retop; /* op to execute on exit from sub */
8e663997
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296 /* Above here is the same for sub, format and eval. */
297 CV * cv;
f9c764c5
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298 /* Above here is the same for sub and format. */
299 GV * gv;
300 GV * dfoutgv;
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301};
302
b36bdeca
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303/* base for the next two macros. Don't use directly.
304 * Note that the refcnt of the cv is incremented twice; The CX one is
305 * decremented by LEAVESUB, the other by LEAVE. */
306
ee98a1d6 307#define PUSHSUB_BASE(cx) \
5ac1e9b2
AA
308 ENTRY_PROBE(GvENAME(CvGV(cv)), \
309 CopFILE((COP*)CvSTART(cv)), \
310 CopLINE((COP*)CvSTART(cv))); \
311 \
79072805 312 cx->blk_sub.cv = cv; \
b8f55b69 313 cx->blk_sub.olddepth = CvDEPTH(cv); \
ae423868 314 cx->cx_type |= (hasargs) ? CXp_HASARGS : 0; \
5f66b61c 315 cx->blk_sub.retop = NULL; \
b36bdeca 316 if (!CvDEPTH(cv)) { \
74c765eb
AL
317 SvREFCNT_inc_simple_void_NN(cv); \
318 SvREFCNT_inc_simple_void_NN(cv); \
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DM
319 SAVEFREESV(cv); \
320 }
321
ee98a1d6
DM
322
323#define PUSHSUB(cx) \
324 PUSHSUB_BASE(cx) \
446d0787 325 cx->blk_u16 = PL_op->op_private & \
cc8d50a7 326 (OPpLVAL_INTRO|OPpENTERSUB_INARGS);
79072805 327
ee98a1d6
DM
328/* variant for use by OP_DBSTATE, where op_private holds hint bits */
329#define PUSHSUB_DB(cx) \
330 PUSHSUB_BASE(cx) \
446d0787 331 cx->blk_u16 = 0;
ee98a1d6
DM
332
333
10067d9a 334#define PUSHFORMAT(cx, retop) \
f9c764c5
NC
335 cx->blk_format.cv = cv; \
336 cx->blk_format.gv = gv; \
337 cx->blk_format.retop = (retop); \
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338 cx->blk_format.dfoutgv = PL_defoutgv; \
339 SvREFCNT_inc_void(cx->blk_format.dfoutgv)
79072805 340
3db8f154 341#define POP_SAVEARRAY() \
6d4ff0d2 342 STMT_START { \
3280af22 343 SvREFCNT_dec(GvAV(PL_defgv)); \
a8bba7fa 344 GvAV(PL_defgv) = cx->blk_sub.savearray; \
6d4ff0d2 345 } STMT_END
6d4ff0d2 346
ecf8e9dd 347/* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
8e09340b
GS
348 * leave any (a fast av_clear(ary), basically) */
349#define CLEAR_ARGARRAY(ary) \
350 STMT_START { \
351 AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \
9c6bc640 352 AvARRAY(ary) = AvALLOC(ary); \
8e09340b
GS
353 AvFILLp(ary) = -1; \
354 } STMT_END
7766f137 355
b0d9ce38
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356#define POPSUB(cx,sv) \
357 STMT_START { \
5ac1e9b2
AA
358 RETURN_PROBE(GvENAME(CvGV((CV*)cx->blk_sub.cv)), \
359 CopFILE((COP*)CvSTART((CV*)cx->blk_sub.cv)), \
360 CopLINE((COP*)CvSTART((CV*)cx->blk_sub.cv))); \
361 \
bafb2adc 362 if (CxHASARGS(cx)) { \
7766f137 363 POP_SAVEARRAY(); \
d8b46c1b 364 /* abandon @_ if it got reified */ \
a8bba7fa 365 if (AvREAL(cx->blk_sub.argarray)) { \
e2d306cb 366 const SSize_t fill = AvFILLp(cx->blk_sub.argarray); \
a8bba7fa
GS
367 SvREFCNT_dec(cx->blk_sub.argarray); \
368 cx->blk_sub.argarray = newAV(); \
369 av_extend(cx->blk_sub.argarray, fill); \
11ca45c0 370 AvREIFY_only(cx->blk_sub.argarray); \
dd2155a4 371 CX_CURPAD_SV(cx->blk_sub, 0) = (SV*)cx->blk_sub.argarray; \
d8b46c1b 372 } \
7766f137 373 else { \
8e09340b 374 CLEAR_ARGARRAY(cx->blk_sub.argarray); \
7766f137 375 } \
79072805 376 } \
b0d9ce38
GS
377 sv = (SV*)cx->blk_sub.cv; \
378 if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \
a0714e2c 379 sv = NULL; \
b0d9ce38
GS
380 } STMT_END
381
382#define LEAVESUB(sv) \
383 STMT_START { \
384 if (sv) \
385 SvREFCNT_dec(sv); \
386 } STMT_END
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387
388#define POPFORMAT(cx) \
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389 setdefout(cx->blk_format.dfoutgv); \
390 SvREFCNT_dec(cx->blk_format.dfoutgv);
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391
392/* eval context */
393struct block_eval {
8e663997
NC
394 OP * retop; /* op to execute on exit from eval */
395 /* Above here is the same for sub, format and eval. */
0f79a09d 396 SV * old_namesv;
79072805 397 OP * old_eval_root;
748a9306 398 SV * cur_text;
2090ab20 399 CV * cv;
abd70938 400 JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
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401};
402
17347a51
NC
403/* If we ever need more than 512 op types, change the shift from 7.
404 blku_gimme is actually also only 2 bits, so could be merged with something.
405*/
406
407#define CxOLD_IN_EVAL(cx) (((cx)->blk_u16) & 0x7F)
408#define CxOLD_OP_TYPE(cx) (((cx)->blk_u16) >> 7)
85a64632 409
6b75f042 410#define PUSHEVAL(cx,n) \
0f79a09d 411 STMT_START { \
17347a51
NC
412 assert(!(PL_in_eval & ~0x7F)); \
413 assert(!(PL_op->op_type & ~0x1FF)); \
414 cx->blk_u16 = (PL_in_eval & 0x7F) | ((U16)PL_op->op_type << 7); \
a0714e2c 415 cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL); \
a8bba7fa 416 cx->blk_eval.old_eval_root = PL_eval_root; \
bdc0bf6f 417 cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL; \
601f1833 418 cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */ \
5f66b61c 419 cx->blk_eval.retop = NULL; \
abd70938 420 cx->blk_eval.cur_top_env = PL_top_env; \
0f79a09d 421 } STMT_END
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422
423#define POPEVAL(cx) \
0f79a09d 424 STMT_START { \
85a64632
NC
425 PL_in_eval = CxOLD_IN_EVAL(cx); \
426 optype = CxOLD_OP_TYPE(cx); \
7766f137 427 PL_eval_root = cx->blk_eval.old_eval_root; \
0f79a09d
GS
428 if (cx->blk_eval.old_namesv) \
429 sv_2mortal(cx->blk_eval.old_namesv); \
430 } STMT_END
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431
432/* loop context */
433struct block_loop {
79072805 434 I32 resetsp;
022eaa24
NC
435 LOOP * my_op; /* My op, that contains redo, next and last ops. */
436 /* (except for non_ithreads we need to modify next_op in pp_ctl.c, hence
437 why next_op is conditionally defined below.) */
7766f137 438#ifdef USE_ITHREADS
e846cb92
NC
439 PAD *oldcomppad; /* Also used for the GV, if targoffset is 0 */
440 /* This is also accesible via cx->blk_loop.my_op->op_targ */
441 PADOFFSET targoffset;
7766f137 442#else
022eaa24 443 OP * next_op;
79072805 444 SV ** itervar;
7766f137 445#endif
493b0a3c 446 union {
d01136d6
BS
447 struct { /* valid if type is LOOP_FOR or LOOP_PLAIN (but {NULL,0})*/
448 AV * ary; /* use the stack if this is NULL */
449 IV ix;
450 } ary;
451 struct { /* valid if type is LOOP_LAZYIV */
452 IV cur;
453 IV end;
454 } lazyiv;
455 struct { /* valid if type if LOOP_LAZYSV */
456 SV * cur;
457 SV * end; /* maxiumum value (or minimum in reverse) */
458 } lazysv;
459 } state_u;
79072805
LW
460};
461
7766f137
GS
462#ifdef USE_ITHREADS
463# define CxITERVAR(c) \
e846cb92
NC
464 ((c)->blk_loop.oldcomppad \
465 ? (CxPADLOOP(c) \
466 ? &CX_CURPAD_SV( (c)->blk_loop, (c)->blk_loop.targoffset ) \
467 : &GvSV((GV*)(c)->blk_loop.oldcomppad)) \
7766f137 468 : (SV**)NULL)
e846cb92
NC
469# define CX_ITERDATA_SET(cx,idata,o) \
470 if ((cx->blk_loop.targoffset = (o))) \
471 CX_CURPAD_SAVE(cx->blk_loop); \
472 else \
473 cx->blk_loop.oldcomppad = (idata);
7766f137
GS
474#else
475# define CxITERVAR(c) ((c)->blk_loop.itervar)
e846cb92 476# define CX_ITERDATA_SET(cx,ivar,o) \
09edbca0 477 cx->blk_loop.itervar = (SV**)(ivar);
7766f137 478#endif
a61a7064 479#define CxLABEL(c) (0 + (c)->blk_oldcop->cop_label)
ae423868 480#define CxHASARGS(c) (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
446d0787 481#define CxLVAL(c) (0 + (c)->blk_u16)
7766f137 482
022eaa24
NC
483#ifdef USE_ITHREADS
484# define PUSHLOOP_OP_NEXT /* No need to do anything. */
485# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.my_op->op_nextop + 0)
486#else
487# define PUSHLOOP_OP_NEXT cx->blk_loop.next_op = cLOOP->op_nextop
488# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.next_op + 0)
489#endif
490
3b719c58
NC
491#define PUSHLOOP_PLAIN(cx, s) \
492 cx->blk_loop.resetsp = s - PL_stack_base; \
493 cx->blk_loop.my_op = cLOOP; \
494 PUSHLOOP_OP_NEXT; \
d01136d6
BS
495 cx->blk_loop.state_u.ary.ary = NULL; \
496 cx->blk_loop.state_u.ary.ix = 0; \
e846cb92 497 CX_ITERDATA_SET(cx, NULL, 0);
3b719c58 498
e846cb92 499#define PUSHLOOP_FOR(cx, dat, s, offset) \
38a230cb 500 cx->blk_loop.resetsp = s - PL_stack_base; \
022eaa24
NC
501 cx->blk_loop.my_op = cLOOP; \
502 PUSHLOOP_OP_NEXT; \
d01136d6
BS
503 cx->blk_loop.state_u.ary.ary = NULL; \
504 cx->blk_loop.state_u.ary.ix = 0; \
e846cb92 505 CX_ITERDATA_SET(cx, dat, offset);
79072805
LW
506
507#define POPLOOP(cx) \
d01136d6
BS
508 if (CxTYPE(cx) == CXt_LOOP_LAZYSV) { \
509 SvREFCNT_dec(cx->blk_loop.state_u.lazysv.cur); \
510 SvREFCNT_dec(cx->blk_loop.state_u.lazysv.end); \
511 } \
d01136d6
BS
512 if (CxTYPE(cx) == CXt_LOOP_FOR) \
513 SvREFCNT_dec(cx->blk_loop.state_u.ary.ary);
79072805 514
0d863452
RH
515/* given/when context */
516struct block_givwhen {
517 OP *leave_op;
518};
519
520#define PUSHGIVEN(cx) \
521 cx->blk_givwhen.leave_op = cLOGOP->op_other;
522
523#define PUSHWHEN PUSHGIVEN
524
79072805
LW
525/* context common to subroutines, evals and loops */
526struct block {
446d0787 527 U8 blku_type; /* what kind of context this is */
2e0df0e8 528 U8 blku_gimme; /* is this block running in list context? */
17347a51 529 U16 blku_u16; /* used by block_sub and block_eval (so far) */
79072805
LW
530 I32 blku_oldsp; /* stack pointer to copy stuff down to */
531 COP * blku_oldcop; /* old curcop pointer */
79072805
LW
532 I32 blku_oldmarksp; /* mark stack index */
533 I32 blku_oldscopesp; /* scope stack index */
534 PMOP * blku_oldpm; /* values of pattern match vars */
79072805
LW
535
536 union {
537 struct block_sub blku_sub;
f9c764c5 538 struct block_format blku_format;
79072805
LW
539 struct block_eval blku_eval;
540 struct block_loop blku_loop;
0d863452 541 struct block_givwhen blku_givwhen;
79072805
LW
542 } blk_u;
543};
544#define blk_oldsp cx_u.cx_blk.blku_oldsp
545#define blk_oldcop cx_u.cx_blk.blku_oldcop
79072805
LW
546#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
547#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
548#define blk_oldpm cx_u.cx_blk.blku_oldpm
549#define blk_gimme cx_u.cx_blk.blku_gimme
446d0787 550#define blk_u16 cx_u.cx_blk.blku_u16
79072805 551#define blk_sub cx_u.cx_blk.blk_u.blku_sub
f9c764c5 552#define blk_format cx_u.cx_blk.blk_u.blku_format
79072805
LW
553#define blk_eval cx_u.cx_blk.blk_u.blku_eval
554#define blk_loop cx_u.cx_blk.blk_u.blku_loop
0d863452 555#define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen
79072805
LW
556
557/* Enter a block. */
8990e307 558#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805 559 cx->cx_type = t, \
3280af22
NIS
560 cx->blk_oldsp = sp - PL_stack_base, \
561 cx->blk_oldcop = PL_curcop, \
1aff0e91 562 cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
3280af22 563 cx->blk_oldscopesp = PL_scopestack_ix, \
3280af22 564 cx->blk_oldpm = PL_curpm, \
eb160463 565 cx->blk_gimme = (U8)gimme; \
bf49b057 566 DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
1aff0e91 567 (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
79072805
LW
568
569/* Exit a block (RETURN and LAST). */
a0d0e21e 570#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
1aff0e91 571 newsp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
572 PL_curcop = cx->blk_oldcop, \
573 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
574 PL_scopestack_ix = cx->blk_oldscopesp, \
3280af22
NIS
575 pm = cx->blk_oldpm, \
576 gimme = cx->blk_gimme; \
b4ab917c 577 DEBUG_SCOPE("POPBLOCK"); \
bf49b057 578 DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \
22c35a8c 579 (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
79072805
LW
580
581/* Continue a block elsewhere (NEXT and REDO). */
3280af22 582#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
1aff0e91 583 PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
584 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
585 PL_scopestack_ix = cx->blk_oldscopesp, \
b4ab917c
DM
586 PL_curpm = cx->blk_oldpm; \
587 DEBUG_SCOPE("TOPBLOCK");
79072805
LW
588
589/* substitution context */
590struct subst {
446d0787 591 U8 sbu_type; /* what kind of context this is */
1ed74d04 592 U8 sbu_rflags;
446d0787 593 U16 sbu_rxtainted; /* matches struct block */
79072805
LW
594 I32 sbu_iters;
595 I32 sbu_maxiters;
4633a7c4 596 I32 sbu_oldsave;
79072805
LW
597 char * sbu_orig;
598 SV * sbu_dstr;
599 SV * sbu_targ;
600 char * sbu_s;
601 char * sbu_m;
602 char * sbu_strend;
c90c0ff4 603 void * sbu_rxres;
c07a80fd 604 REGEXP * sbu_rx;
79072805
LW
605};
606#define sb_iters cx_u.cx_subst.sbu_iters
607#define sb_maxiters cx_u.cx_subst.sbu_maxiters
22e551b9 608#define sb_rflags cx_u.cx_subst.sbu_rflags
4633a7c4 609#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc
PP
610#define sb_once cx_u.cx_subst.sbu_once
611#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
79072805
LW
612#define sb_orig cx_u.cx_subst.sbu_orig
613#define sb_dstr cx_u.cx_subst.sbu_dstr
614#define sb_targ cx_u.cx_subst.sbu_targ
615#define sb_s cx_u.cx_subst.sbu_s
616#define sb_m cx_u.cx_subst.sbu_m
617#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4 618#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd 619#define sb_rx cx_u.cx_subst.sbu_rx
79072805
LW
620
621#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
622 cx->sb_iters = iters, \
623 cx->sb_maxiters = maxiters, \
22e551b9 624 cx->sb_rflags = r_flags, \
4633a7c4 625 cx->sb_oldsave = oldsave, \
71be2cbc 626 cx->sb_rxtainted = rxtainted, \
79072805
LW
627 cx->sb_orig = orig, \
628 cx->sb_dstr = dstr, \
629 cx->sb_targ = targ, \
630 cx->sb_s = s, \
631 cx->sb_m = m, \
632 cx->sb_strend = strend, \
4608196e 633 cx->sb_rxres = NULL, \
c07a80fd 634 cx->sb_rx = rx, \
1ed74d04 635 cx->cx_type = CXt_SUBST | (once ? CXp_ONCE : 0); \
e22ae1e2 636 rxres_save(&cx->sb_rxres, rx); \
b69b0499 637 (void)ReREFCNT_inc(rx)
79072805 638
1ed74d04 639#define CxONCE(cx) ((cx)->cx_type & CXp_ONCE)
c5bed6a7 640
c90c0ff4 641#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
e22ae1e2
DM
642 rxres_free(&cx->sb_rxres); \
643 ReREFCNT_dec(cx->sb_rx)
79072805
LW
644
645struct context {
79072805
LW
646 union {
647 struct block cx_blk;
648 struct subst cx_subst;
649 } cx_u;
650};
2e0df0e8 651#define cx_type cx_u.cx_subst.sbu_type
6b35e009 652
76753e7f
NC
653/* If you re-order these, there is also an array of uppercase names in perl.h
654 and a static array of context names in pp_ctl.c */
3701055e 655#define CXTYPEMASK 0xf
79072805 656#define CXt_NULL 0
76753e7f
NC
657#define CXt_WHEN 1
658#define CXt_BLOCK 2
659/* When micro-optimising :-) keep GIVEN next to the LOOPs, as these 5 share a
660 jump table in pp_ctl.c
661 The first 4 don't have a 'case' in at least one switch statement in pp_ctl.c
662*/
663#define CXt_GIVEN 3
c6fdafd0 664/* This is first so that CXt_LOOP_FOR|CXt_LOOP_LAZYIV is CXt_LOOP_LAZYIV */
76753e7f
NC
665#define CXt_LOOP_FOR 4
666#define CXt_LOOP_PLAIN 5
667#define CXt_LOOP_LAZYSV 6
668#define CXt_LOOP_LAZYIV 7
669#define CXt_SUB 8
670#define CXt_FORMAT 9
671#define CXt_EVAL 10
672#define CXt_SUBST 11
673/* SUBST doesn't feature in all switch statements. */
79072805 674
3701055e
NC
675/* private flags for CXt_SUB and CXt_NULL
676 However, this is checked in many places which do not check the type, so
677 this bit needs to be kept clear for most everything else. For reasons I
678 haven't investigated, it can coexist with CXp_FOR_DEF */
1f27d788
NC
679#define CXp_MULTICALL 0x10 /* part of a multicall (so don't
680 tear down context on exit). */
9850bf21 681
ae423868 682/* private flags for CXt_SUB and CXt_FORMAT */
1f27d788 683#define CXp_HASARGS 0x20
ae423868 684
6b35e009 685/* private flags for CXt_EVAL */
1f27d788
NC
686#define CXp_REAL 0x20 /* truly eval'', not a lookalike */
687#define CXp_TRYBLOCK 0x40 /* eval{}, not eval'' or similar */
6b35e009 688
7766f137 689/* private flags for CXt_LOOP */
1f27d788 690#define CXp_FOR_DEF 0x10 /* foreach using $_ */
0d863452 691#ifdef USE_ITHREADS
e846cb92 692# define CxPADLOOP(c) ((c)->blk_loop.targoffset)
7766f137 693#endif
e846cb92 694
1ed74d04
NC
695/* private flags for CXt_SUBST */
696#define CXp_ONCE 0x10 /* What was sbu_once in struct subst */
7766f137 697
6b35e009 698#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
76753e7f 699#define CxTYPE_is_LOOP(c) (((c)->cx_type & 0xC) == 0x4)
9850bf21
RH
700#define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
701 == CXp_MULTICALL)
0588a150 702#define CxREALEVAL(c) (((c)->cx_type & (CXTYPEMASK|CXp_REAL)) \
7766f137 703 == (CXt_EVAL|CXp_REAL))
0588a150 704#define CxTRYBLOCK(c) (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK)) \
1d76a5c3 705 == (CXt_EVAL|CXp_TRYBLOCK))
3b719c58
NC
706#define CxFOREACH(c) (CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN)
707#define CxFOREACHDEF(c) ((CxTYPE_is_LOOP(c) && CxTYPE(c) != CXt_LOOP_PLAIN) \
708 && ((c)->cx_type & CXp_FOR_DEF))
6b35e009 709
79072805
LW
710#define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
711
ccfc67b7
JH
712/*
713=head1 "Gimme" Values
714*/
954c1994
GS
715
716/*
717=for apidoc AmU||G_SCALAR
718Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and
719L<perlcall>.
720
721=for apidoc AmU||G_ARRAY
91e74348 722Used to indicate list context. See C<GIMME_V>, C<GIMME> and
954c1994
GS
723L<perlcall>.
724
725=for apidoc AmU||G_VOID
726Used to indicate void context. See C<GIMME_V> and L<perlcall>.
727
728=for apidoc AmU||G_DISCARD
729Indicates that arguments returned from a callback should be discarded. See
730L<perlcall>.
731
732=for apidoc AmU||G_EVAL
733
734Used to force a Perl C<eval> wrapper around a callback. See
735L<perlcall>.
736
737=for apidoc AmU||G_NOARGS
738
739Indicates that no arguments are being sent to a callback. See
740L<perlcall>.
741
742=cut
743*/
744
2f8edad0
NC
745#define G_SCALAR 2
746#define G_ARRAY 3
747#define G_VOID 1
748#define G_WANT 3
79072805 749
864dbfa3 750/* extra flags for Perl_call_* routines */
2f8edad0 751#define G_DISCARD 4 /* Call FREETMPS.
b54b4831
NC
752 Don't change this without consulting the
753 hash actions codes defined in hv.h */
2f8edad0
NC
754#define G_EVAL 8 /* Assume eval {} around subroutine call. */
755#define G_NOARGS 16 /* Don't construct a @_ array. */
756#define G_KEEPERR 32 /* Append errors to $@, don't overwrite it */
757#define G_NODEBUG 64 /* Disable debugging at toplevel. */
758#define G_METHOD 128 /* Calling method. */
c40f1585 759#define G_FAKINGEVAL 256 /* Faking an eval context for call_sv or
edb2152a 760 fold_constants. */
e336de0d 761
faef0170
HS
762/* flag bits for PL_in_eval */
763#define EVAL_NULL 0 /* not in an eval */
764#define EVAL_INEVAL 1 /* some enclosing scope is an eval */
765#define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */
864dbfa3 766#define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */
6dc8a9e4 767#define EVAL_INREQUIRE 8 /* The code is being required. */
faef0170 768
e336de0d
GS
769/* Support for switching (stack and block) contexts.
770 * This ensures magic doesn't invalidate local stack and cx pointers.
771 */
772
e788e7d3
GS
773#define PERLSI_UNKNOWN -1
774#define PERLSI_UNDEF 0
775#define PERLSI_MAIN 1
776#define PERLSI_MAGIC 2
777#define PERLSI_SORT 3
778#define PERLSI_SIGNAL 4
779#define PERLSI_OVERLOAD 5
780#define PERLSI_DESTROY 6
781#define PERLSI_WARNHOOK 7
782#define PERLSI_DIEHOOK 8
783#define PERLSI_REQUIRE 9
e336de0d
GS
784
785struct stackinfo {
786 AV * si_stack; /* stack for current runlevel */
787 PERL_CONTEXT * si_cxstack; /* context stack for runlevel */
9bd87817
NC
788 struct stackinfo * si_prev;
789 struct stackinfo * si_next;
e336de0d
GS
790 I32 si_cxix; /* current context index */
791 I32 si_cxmax; /* maximum allocated index */
792 I32 si_type; /* type of runlevel */
ce2f7c3b 793 I32 si_markoff; /* offset where markstack begins for us.
e336de0d
GS
794 * currently used only with DEBUGGING,
795 * but not #ifdef-ed for bincompat */
796};
797
798typedef struct stackinfo PERL_SI;
799
3280af22
NIS
800#define cxstack (PL_curstackinfo->si_cxstack)
801#define cxstack_ix (PL_curstackinfo->si_cxix)
802#define cxstack_max (PL_curstackinfo->si_cxmax)
e336de0d
GS
803
804#ifdef DEBUGGING
ce2f7c3b
GS
805# define SET_MARK_OFFSET \
806 PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
e336de0d 807#else
ce2f7c3b 808# define SET_MARK_OFFSET NOOP
e336de0d
GS
809#endif
810
d3acc0f7 811#define PUSHSTACKi(type) \
e336de0d 812 STMT_START { \
3280af22 813 PERL_SI *next = PL_curstackinfo->si_next; \
e336de0d
GS
814 if (!next) { \
815 next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \
3280af22
NIS
816 next->si_prev = PL_curstackinfo; \
817 PL_curstackinfo->si_next = next; \
e336de0d
GS
818 } \
819 next->si_type = type; \
820 next->si_cxix = -1; \
821 AvFILLp(next->si_stack) = 0; \
3280af22
NIS
822 SWITCHSTACK(PL_curstack,next->si_stack); \
823 PL_curstackinfo = next; \
ce2f7c3b 824 SET_MARK_OFFSET; \
e336de0d
GS
825 } STMT_END
826
e788e7d3 827#define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
d3acc0f7 828
3095d977
GS
829/* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
830 * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
d3acc0f7 831#define POPSTACK \
e336de0d 832 STMT_START { \
39644a26 833 dSP; \
c4420975 834 PERL_SI * const prev = PL_curstackinfo->si_prev; \
e336de0d 835 if (!prev) { \
bf49b057 836 PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \
e336de0d
GS
837 my_exit(1); \
838 } \
3280af22 839 SWITCHSTACK(PL_curstack,prev->si_stack); \
e336de0d 840 /* don't free prev here, free them all at the END{} */ \
3280af22 841 PL_curstackinfo = prev; \
e336de0d
GS
842 } STMT_END
843
844#define POPSTACK_TO(s) \
845 STMT_START { \
3280af22 846 while (PL_curstack != s) { \
bac4b2ad 847 dounwind(-1); \
d3acc0f7 848 POPSTACK; \
bac4b2ad 849 } \
e336de0d 850 } STMT_END
923e4eb5
JH
851
852#define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
853#define IN_PERL_RUNTIME (PL_curcop != &PL_compiling)
854
9850bf21
RH
855/*
856=head1 Multicall Functions
857
858=for apidoc Ams||dMULTICALL
859Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>.
860
861=for apidoc Ams||PUSH_MULTICALL
862Opening bracket for a lightweight callback.
863See L<perlcall/Lightweight Callbacks>.
864
865=for apidoc Ams||MULTICALL
866Make a lightweight callback. See L<perlcall/Lightweight Callbacks>.
867
868=for apidoc Ams||POP_MULTICALL
869Closing bracket for a lightweight callback.
870See L<perlcall/Lightweight Callbacks>.
871
872=cut
873*/
874
875#define dMULTICALL \
876 SV **newsp; /* set by POPBLOCK */ \
877 PERL_CONTEXT *cx; \
82f35e8b 878 CV *multicall_cv; \
9850bf21
RH
879 OP *multicall_cop; \
880 bool multicall_oldcatch; \
881 U8 hasargs = 0 /* used by PUSHSUB */
882
82f35e8b 883#define PUSH_MULTICALL(the_cv) \
9850bf21 884 STMT_START { \
0bcc34c2
AL
885 CV * const _nOnclAshIngNamE_ = the_cv; \
886 CV * const cv = _nOnclAshIngNamE_; \
887 AV * const padlist = CvPADLIST(cv); \
9850bf21
RH
888 ENTER; \
889 multicall_oldcatch = CATCH_GET; \
890 SAVETMPS; SAVEVPTR(PL_op); \
891 CATCH_SET(TRUE); \
892 PUSHBLOCK(cx, CXt_SUB|CXp_MULTICALL, PL_stack_sp); \
893 PUSHSUB(cx); \
894 if (++CvDEPTH(cv) >= 2) { \
895 PERL_STACK_OVERFLOW_CHECK(); \
896 Perl_pad_push(aTHX_ padlist, CvDEPTH(cv)); \
897 } \
898 SAVECOMPPAD(); \
899 PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv)); \
82f35e8b 900 multicall_cv = cv; \
9850bf21
RH
901 multicall_cop = CvSTART(cv); \
902 } STMT_END
903
904#define MULTICALL \
905 STMT_START { \
906 PL_op = multicall_cop; \
907 CALLRUNOPS(aTHX); \
908 } STMT_END
909
910#define POP_MULTICALL \
911 STMT_START { \
82f35e8b
RH
912 LEAVESUB(multicall_cv); \
913 CvDEPTH(multicall_cv)--; \
9850bf21
RH
914 POPBLOCK(cx,PL_curpm); \
915 CATCH_SET(multicall_oldcatch); \
916 LEAVE; \
917 } STMT_END
b3ca2e83
NC
918
919/*
920 * Local variables:
921 * c-indentation-style: bsd
922 * c-basic-offset: 4
923 * indent-tabs-mode: t
924 * End:
925 *
926 * ex: set ts=8 sts=4 sw=4 noet:
927 */