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In struct block_eval, access the members old_in_eval and old_op_type
[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)
6a3d5e3d 199# define CopLABEL_free(c) SAVECOPLABEL_FREE(c)
63031daf 200# define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL)
7e4e8c89 201# else
ed221c57 202# define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c))
bd61b366 203# define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
6a3d5e3d 204# define CopLABEL_free(c) (PerlMemShared_free(CopLABEL(c)),(CopLABEL(c) = NULL))
63031daf 205# define CopLABEL_alloc(pv) ((pv)?savesharedpv(pv):NULL)
7e4e8c89 206# endif
57843af0
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207#else
208# define CopFILEGV(c) ((c)->cop_filegv)
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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
RGS
219# define CopFILE(c) (CopFILEGV(c) && GvSV(CopFILEGV(c)) \
220 ? SvPVX(GvSV(CopFILEGV(c))) : NULL)
57843af0 221# define CopSTASH(c) ((c)->cop_stash)
6a3d5e3d 222# define CopLABEL(c) ((c)->cop_label)
f4dd75d9 223# define CopSTASH_set(c,hv) ((c)->cop_stash = (hv))
bd61b366 224# define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
f4dd75d9
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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
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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); \
b36bdeca
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); \
f9c764c5
NC
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
GS
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) \
f9c764c5
NC
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. */
31a3f62b
NC
396 U8 old_in_eval;
397 U16 old_op_type;
0f79a09d 398 SV * old_namesv;
79072805 399 OP * old_eval_root;
748a9306 400 SV * cur_text;
2090ab20 401 CV * cv;
abd70938 402 JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */
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403};
404
85a64632
NC
405#define CxOLD_IN_EVAL(cx) (0 + (cx)->blk_eval.old_in_eval)
406#define CxOLD_OP_TYPE(cx) (0 + (cx)->blk_eval.old_op_type)
407
8990e307 408#define PUSHEVAL(cx,n,fgv) \
0f79a09d 409 STMT_START { \
3280af22 410 cx->blk_eval.old_in_eval = PL_in_eval; \
a8bba7fa 411 cx->blk_eval.old_op_type = PL_op->op_type; \
a0714e2c 412 cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL); \
a8bba7fa 413 cx->blk_eval.old_eval_root = PL_eval_root; \
bdc0bf6f 414 cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL; \
601f1833 415 cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */ \
5f66b61c 416 cx->blk_eval.retop = NULL; \
abd70938 417 cx->blk_eval.cur_top_env = PL_top_env; \
0f79a09d 418 } STMT_END
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419
420#define POPEVAL(cx) \
0f79a09d 421 STMT_START { \
85a64632
NC
422 PL_in_eval = CxOLD_IN_EVAL(cx); \
423 optype = CxOLD_OP_TYPE(cx); \
7766f137 424 PL_eval_root = cx->blk_eval.old_eval_root; \
0f79a09d
GS
425 if (cx->blk_eval.old_namesv) \
426 sv_2mortal(cx->blk_eval.old_namesv); \
427 } STMT_END
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LW
428
429/* loop context */
430struct block_loop {
79072805 431 I32 resetsp;
022eaa24
NC
432 LOOP * my_op; /* My op, that contains redo, next and last ops. */
433 /* (except for non_ithreads we need to modify next_op in pp_ctl.c, hence
434 why next_op is conditionally defined below.) */
7766f137
GS
435#ifdef USE_ITHREADS
436 void * iterdata;
f3548bdc 437 PAD *oldcomppad;
7766f137 438#else
022eaa24 439 OP * next_op;
79072805 440 SV ** itervar;
7766f137 441#endif
79072805 442 SV * itersave;
0a498629
NC
443 /* (from inspection of source code) for a .. range of strings this is the
444 current string. */
5f05dabc 445 SV * iterlval;
0a498629
NC
446 /* (from inspection of source code) for a foreach loop this is the array
447 being iterated over. For a .. range of numbers it's the current value.
448 A check is often made on the SvTYPE of iterary to determine whether
449 we are iterating over an array or a range. (numbers or strings) */
79072805 450 AV * iterary;
89ea2908 451 IV iterix;
0a498629
NC
452 /* (from inspection of source code) for a .. range of numbers this is the
453 maximum value. */
89ea2908 454 IV itermax;
79072805 455};
0a498629
NC
456/* It might be possible to squeeze this structure further. As best I can tell
457 itermax and iterlval are never used at the same time, so it might be possible
458 to make them into a union. However, I'm not confident that there are enough
459 flag bits/NULLable pointers in this structure alone to encode which is
460 active. There is, however, U8 of space free in struct block, which could be
461 used. Right now it may not be worth squeezing this structure further, as it's
462 the largest part of struct block, and currently struct block is 64 bytes on
463 an ILP32 system, which will give good cache alignment.
464*/
79072805 465
7766f137
GS
466#ifdef USE_ITHREADS
467# define CxITERVAR(c) \
468 ((c)->blk_loop.iterdata \
469 ? (CxPADLOOP(cx) \
dd2155a4
DM
470 ? &CX_CURPAD_SV( (c)->blk_loop, \
471 INT2PTR(PADOFFSET, (c)->blk_loop.iterdata)) \
7766f137
GS
472 : &GvSV((GV*)(c)->blk_loop.iterdata)) \
473 : (SV**)NULL)
474# define CX_ITERDATA_SET(cx,idata) \
dd2155a4 475 CX_CURPAD_SAVE(cx->blk_loop); \
155aba94 476 if ((cx->blk_loop.iterdata = (idata))) \
d10edb75
KC
477 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
478 else \
a0714e2c 479 cx->blk_loop.itersave = NULL;
7766f137
GS
480#else
481# define CxITERVAR(c) ((c)->blk_loop.itervar)
482# define CX_ITERDATA_SET(cx,ivar) \
155aba94 483 if ((cx->blk_loop.itervar = (SV**)(ivar))) \
d10edb75
KC
484 cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \
485 else \
a0714e2c 486 cx->blk_loop.itersave = NULL;
7766f137 487#endif
a61a7064 488#define CxLABEL(c) (0 + (c)->blk_oldcop->cop_label)
ae423868 489#define CxHASARGS(c) (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
446d0787 490#define CxLVAL(c) (0 + (c)->blk_u16)
7766f137 491
022eaa24
NC
492#ifdef USE_ITHREADS
493# define PUSHLOOP_OP_NEXT /* No need to do anything. */
494# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.my_op->op_nextop + 0)
495#else
496# define PUSHLOOP_OP_NEXT cx->blk_loop.next_op = cLOOP->op_nextop
497# define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.next_op + 0)
498#endif
499
7766f137 500#define PUSHLOOP(cx, dat, s) \
38a230cb 501 cx->blk_loop.resetsp = s - PL_stack_base; \
022eaa24
NC
502 cx->blk_loop.my_op = cLOOP; \
503 PUSHLOOP_OP_NEXT; \
a0714e2c 504 cx->blk_loop.iterlval = NULL; \
7d49f689 505 cx->blk_loop.iterary = NULL; \
7766f137
GS
506 cx->blk_loop.iterix = -1; \
507 CX_ITERDATA_SET(cx,dat);
79072805
LW
508
509#define POPLOOP(cx) \
a8bba7fa 510 SvREFCNT_dec(cx->blk_loop.iterlval); \
7766f137 511 if (CxITERVAR(cx)) { \
21401c75 512 if (SvPADMY(cx->blk_loop.itersave)) { \
d4c19fe8 513 SV ** const s_v_p = CxITERVAR(cx); \
21401c75
CH
514 sv_2mortal(*s_v_p); \
515 *s_v_p = cx->blk_loop.itersave; \
516 } \
517 else { \
518 SvREFCNT_dec(cx->blk_loop.itersave); \
519 } \
44a8e56a 520 } \
a8bba7fa
GS
521 if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\
522 SvREFCNT_dec(cx->blk_loop.iterary);
79072805 523
0d863452
RH
524/* given/when context */
525struct block_givwhen {
526 OP *leave_op;
527};
528
529#define PUSHGIVEN(cx) \
530 cx->blk_givwhen.leave_op = cLOGOP->op_other;
531
532#define PUSHWHEN PUSHGIVEN
533
79072805
LW
534/* context common to subroutines, evals and loops */
535struct block {
446d0787 536 U8 blku_type; /* what kind of context this is */
2e0df0e8 537 U8 blku_gimme; /* is this block running in list context? */
446d0787 538 U16 blku_u16; /* U16 of space used by block_sub */
79072805
LW
539 I32 blku_oldsp; /* stack pointer to copy stuff down to */
540 COP * blku_oldcop; /* old curcop pointer */
79072805
LW
541 I32 blku_oldmarksp; /* mark stack index */
542 I32 blku_oldscopesp; /* scope stack index */
543 PMOP * blku_oldpm; /* values of pattern match vars */
79072805
LW
544
545 union {
546 struct block_sub blku_sub;
f9c764c5 547 struct block_format blku_format;
79072805
LW
548 struct block_eval blku_eval;
549 struct block_loop blku_loop;
0d863452 550 struct block_givwhen blku_givwhen;
79072805
LW
551 } blk_u;
552};
553#define blk_oldsp cx_u.cx_blk.blku_oldsp
554#define blk_oldcop cx_u.cx_blk.blku_oldcop
79072805
LW
555#define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp
556#define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp
557#define blk_oldpm cx_u.cx_blk.blku_oldpm
558#define blk_gimme cx_u.cx_blk.blku_gimme
446d0787 559#define blk_u16 cx_u.cx_blk.blku_u16
79072805 560#define blk_sub cx_u.cx_blk.blk_u.blku_sub
f9c764c5 561#define blk_format cx_u.cx_blk.blk_u.blku_format
79072805
LW
562#define blk_eval cx_u.cx_blk.blk_u.blku_eval
563#define blk_loop cx_u.cx_blk.blk_u.blku_loop
0d863452 564#define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen
79072805
LW
565
566/* Enter a block. */
8990e307 567#define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \
79072805 568 cx->cx_type = t, \
3280af22
NIS
569 cx->blk_oldsp = sp - PL_stack_base, \
570 cx->blk_oldcop = PL_curcop, \
1aff0e91 571 cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \
3280af22 572 cx->blk_oldscopesp = PL_scopestack_ix, \
3280af22 573 cx->blk_oldpm = PL_curpm, \
eb160463 574 cx->blk_gimme = (U8)gimme; \
bf49b057 575 DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
1aff0e91 576 (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
79072805
LW
577
578/* Exit a block (RETURN and LAST). */
a0d0e21e 579#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \
1aff0e91 580 newsp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
581 PL_curcop = cx->blk_oldcop, \
582 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
583 PL_scopestack_ix = cx->blk_oldscopesp, \
3280af22
NIS
584 pm = cx->blk_oldpm, \
585 gimme = cx->blk_gimme; \
b4ab917c 586 DEBUG_SCOPE("POPBLOCK"); \
bf49b057 587 DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \
22c35a8c 588 (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
79072805
LW
589
590/* Continue a block elsewhere (NEXT and REDO). */
3280af22 591#define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \
1aff0e91 592 PL_stack_sp = PL_stack_base + cx->blk_oldsp, \
3280af22
NIS
593 PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \
594 PL_scopestack_ix = cx->blk_oldscopesp, \
b4ab917c
DM
595 PL_curpm = cx->blk_oldpm; \
596 DEBUG_SCOPE("TOPBLOCK");
79072805
LW
597
598/* substitution context */
599struct subst {
446d0787
NC
600 U8 sbu_type; /* what kind of context this is */
601 U8 sbu_once; /* Actually both booleans, but U8/U16 */
602 U16 sbu_rxtainted; /* matches struct block */
79072805
LW
603 I32 sbu_iters;
604 I32 sbu_maxiters;
22e551b9 605 I32 sbu_rflags;
4633a7c4 606 I32 sbu_oldsave;
79072805
LW
607 char * sbu_orig;
608 SV * sbu_dstr;
609 SV * sbu_targ;
610 char * sbu_s;
611 char * sbu_m;
612 char * sbu_strend;
c90c0ff4 613 void * sbu_rxres;
c07a80fd 614 REGEXP * sbu_rx;
79072805
LW
615};
616#define sb_iters cx_u.cx_subst.sbu_iters
617#define sb_maxiters cx_u.cx_subst.sbu_maxiters
22e551b9 618#define sb_rflags cx_u.cx_subst.sbu_rflags
4633a7c4 619#define sb_oldsave cx_u.cx_subst.sbu_oldsave
71be2cbc
PP
620#define sb_once cx_u.cx_subst.sbu_once
621#define sb_rxtainted cx_u.cx_subst.sbu_rxtainted
79072805
LW
622#define sb_orig cx_u.cx_subst.sbu_orig
623#define sb_dstr cx_u.cx_subst.sbu_dstr
624#define sb_targ cx_u.cx_subst.sbu_targ
625#define sb_s cx_u.cx_subst.sbu_s
626#define sb_m cx_u.cx_subst.sbu_m
627#define sb_strend cx_u.cx_subst.sbu_strend
c90c0ff4 628#define sb_rxres cx_u.cx_subst.sbu_rxres
c07a80fd 629#define sb_rx cx_u.cx_subst.sbu_rx
79072805
LW
630
631#define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \
632 cx->sb_iters = iters, \
633 cx->sb_maxiters = maxiters, \
22e551b9 634 cx->sb_rflags = r_flags, \
4633a7c4 635 cx->sb_oldsave = oldsave, \
71be2cbc
PP
636 cx->sb_once = once, \
637 cx->sb_rxtainted = rxtainted, \
79072805
LW
638 cx->sb_orig = orig, \
639 cx->sb_dstr = dstr, \
640 cx->sb_targ = targ, \
641 cx->sb_s = s, \
642 cx->sb_m = m, \
643 cx->sb_strend = strend, \
4608196e 644 cx->sb_rxres = NULL, \
c07a80fd 645 cx->sb_rx = rx, \
c90c0ff4 646 cx->cx_type = CXt_SUBST; \
e22ae1e2 647 rxres_save(&cx->sb_rxres, rx); \
b69b0499 648 (void)ReREFCNT_inc(rx)
79072805 649
c90c0ff4 650#define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \
e22ae1e2
DM
651 rxres_free(&cx->sb_rxres); \
652 ReREFCNT_dec(cx->sb_rx)
79072805
LW
653
654struct context {
79072805
LW
655 union {
656 struct block cx_blk;
657 struct subst cx_subst;
658 } cx_u;
659};
2e0df0e8 660#define cx_type cx_u.cx_subst.sbu_type
6b35e009 661
3701055e 662#define CXTYPEMASK 0xf
79072805
LW
663#define CXt_NULL 0
664#define CXt_SUB 1
665#define CXt_EVAL 2
666#define CXt_LOOP 3
667#define CXt_SUBST 4
668#define CXt_BLOCK 5
7766f137 669#define CXt_FORMAT 6
0d863452
RH
670#define CXt_GIVEN 7
671#define CXt_WHEN 8
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 */
677#define CXp_MULTICALL 0x0000040 /* part of a multicall (so don't
9850bf21
RH
678 tear down context on exit). */
679
ae423868 680/* private flags for CXt_SUB and CXt_FORMAT */
3701055e 681#define CXp_HASARGS 0x00000020
ae423868 682
6b35e009 683/* private flags for CXt_EVAL */
3701055e
NC
684#define CXp_REAL 0x00000010 /* truly eval'', not a lookalike */
685#define CXp_TRYBLOCK 0x00000020 /* eval{}, not eval'' or similar */
6b35e009 686
7766f137 687/* private flags for CXt_LOOP */
3701055e
NC
688#define CXp_FOREACH 0x00000020 /* a foreach loop */
689#define CXp_FOR_DEF 0x00000040 /* foreach using $_ */
0d863452 690#ifdef USE_ITHREADS
3701055e 691# define CXp_PADVAR 0x00000010 /* itervar lives on pad, iterdata
7766f137
GS
692 has pad offset; if not set,
693 iterdata holds GV* */
694# define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \
695 == (CXt_LOOP|CXp_PADVAR))
696#endif
697
6b35e009 698#define CxTYPE(c) ((c)->cx_type & CXTYPEMASK)
9850bf21
RH
699#define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \
700 == CXp_MULTICALL)
0588a150 701#define CxREALEVAL(c) (((c)->cx_type & (CXTYPEMASK|CXp_REAL)) \
7766f137 702 == (CXt_EVAL|CXp_REAL))
0588a150 703#define CxTRYBLOCK(c) (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK)) \
1d76a5c3 704 == (CXt_EVAL|CXp_TRYBLOCK))
0588a150 705#define CxFOREACH(c) (((c)->cx_type & (CXTYPEMASK|CXp_FOREACH)) \
0d863452 706 == (CXt_LOOP|CXp_FOREACH))
0588a150 707#define CxFOREACHDEF(c) (((c)->cx_type & (CXTYPEMASK|CXp_FOREACH|CXp_FOR_DEF))\
0d863452 708 == (CXt_LOOP|CXp_FOREACH|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 */