| 1 | /* cop.h |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 4 | * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, by Larry Wall and others |
| 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 | * |
| 9 | * Control ops (cops) are one of the three ops OP_NEXTSTATE, OP_DBSTATE, |
| 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, |
| 13 | * and thus can be used to determine our current state. |
| 14 | */ |
| 15 | |
| 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 | |
| 31 | struct 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 | |
| 38 | typedef 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", \ |
| 103 | (void*)&cur_env, (void*)PL_top_env)); \ |
| 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", \ |
| 116 | (void*)PL_top_env, (void*)cur_env.je_prev)); \ |
| 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) \ |
| 126 | PerlProc_exit(STATUS_EXIT); \ |
| 127 | PerlIO_printf(PerlIO_stderr(), "panic: top_env\n"); \ |
| 128 | PerlProc_exit(1); \ |
| 129 | } STMT_END |
| 130 | |
| 131 | #define CATCH_GET (PL_top_env->je_mustcatch) |
| 132 | #define CATCH_SET(v) (PL_top_env->je_mustcatch = (v)) |
| 133 | |
| 134 | |
| 135 | #include "mydtrace.h" |
| 136 | |
| 137 | struct cop { |
| 138 | BASEOP |
| 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 */ |
| 142 | char * cop_label; /* label for this construct */ |
| 143 | #ifdef USE_ITHREADS |
| 144 | char * cop_stashpv; /* package line was compiled in */ |
| 145 | char * cop_file; /* file name the following line # is from */ |
| 146 | #else |
| 147 | HV * cop_stash; /* package line was compiled in */ |
| 148 | GV * cop_filegv; /* file the following line # is from */ |
| 149 | #endif |
| 150 | U32 cop_hints; /* hints bits from pragmata */ |
| 151 | U32 cop_seq; /* parse sequence number */ |
| 152 | /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *: */ |
| 153 | STRLEN * cop_warnings; /* lexical warnings bitmask */ |
| 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. */ |
| 156 | struct refcounted_he * cop_hints_hash; |
| 157 | }; |
| 158 | |
| 159 | #ifdef USE_ITHREADS |
| 160 | # define CopFILE(c) ((c)->cop_file) |
| 161 | # define CopFILEGV(c) (CopFILE(c) \ |
| 162 | ? gv_fetchfile(CopFILE(c)) : NULL) |
| 163 | |
| 164 | # ifdef NETWARE |
| 165 | # define CopFILE_set(c,pv) ((c)->cop_file = savepv(pv)) |
| 166 | # define CopFILE_setn(c,pv,l) ((c)->cop_file = savepv((pv),(l))) |
| 167 | # else |
| 168 | # define CopFILE_set(c,pv) ((c)->cop_file = savesharedpv(pv)) |
| 169 | # define CopFILE_setn(c,pv,l) ((c)->cop_file = savesharedpvn((pv),(l))) |
| 170 | # endif |
| 171 | |
| 172 | # define CopFILESV(c) (CopFILE(c) \ |
| 173 | ? GvSV(gv_fetchfile(CopFILE(c))) : NULL) |
| 174 | # define CopFILEAV(c) (CopFILE(c) \ |
| 175 | ? GvAV(gv_fetchfile(CopFILE(c))) : NULL) |
| 176 | # ifdef DEBUGGING |
| 177 | # define CopFILEAVx(c) (assert(CopFILE(c)), \ |
| 178 | GvAV(gv_fetchfile(CopFILE(c)))) |
| 179 | # else |
| 180 | # define CopFILEAVx(c) (GvAV(gv_fetchfile(CopFILE(c)))) |
| 181 | # endif |
| 182 | # define CopSTASHPV(c) ((c)->cop_stashpv) |
| 183 | |
| 184 | # ifdef NETWARE |
| 185 | # define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = ((pv) ? savepv(pv) : NULL)) |
| 186 | # else |
| 187 | # define CopSTASHPV_set(c,pv) ((c)->cop_stashpv = savesharedpv(pv)) |
| 188 | # endif |
| 189 | |
| 190 | # define CopSTASH(c) (CopSTASHPV(c) \ |
| 191 | ? gv_stashpv(CopSTASHPV(c),GV_ADD) : NULL) |
| 192 | # define CopSTASH_set(c,hv) CopSTASHPV_set(c, (hv) ? HvNAME_get(hv) : NULL) |
| 193 | # define CopSTASH_eq(c,hv) ((hv) && stashpv_hvname_match(c,hv)) |
| 194 | # define CopLABEL(c) ((c)->cop_label) |
| 195 | # define CopLABEL_set(c,pv) (CopLABEL(c) = (pv)) |
| 196 | # ifdef NETWARE |
| 197 | # define CopSTASH_free(c) SAVECOPSTASH_FREE(c) |
| 198 | # define CopFILE_free(c) SAVECOPFILE_FREE(c) |
| 199 | # define CopLABEL_free(c) SAVECOPLABEL_FREE(c) |
| 200 | # define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL) |
| 201 | # else |
| 202 | # define CopSTASH_free(c) PerlMemShared_free(CopSTASHPV(c)) |
| 203 | # define CopFILE_free(c) (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL)) |
| 204 | # define CopLABEL_free(c) (PerlMemShared_free(CopLABEL(c)),(CopLABEL(c) = NULL)) |
| 205 | # define CopLABEL_alloc(pv) ((pv)?savesharedpv(pv):NULL) |
| 206 | # endif |
| 207 | #else |
| 208 | # define CopFILEGV(c) ((c)->cop_filegv) |
| 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)) |
| 211 | # define CopFILE_setn(c,pv,l) CopFILEGV_set((c), gv_fetchfile_flags((pv),(l),0)) |
| 212 | # define CopFILESV(c) (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL) |
| 213 | # define CopFILEAV(c) (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL) |
| 214 | # ifdef DEBUGGING |
| 215 | # define CopFILEAVx(c) (assert(CopFILEGV(c)), GvAV(CopFILEGV(c))) |
| 216 | # else |
| 217 | # define CopFILEAVx(c) (GvAV(CopFILEGV(c))) |
| 218 | # endif |
| 219 | # define CopFILE(c) (CopFILEGV(c) && GvSV(CopFILEGV(c)) \ |
| 220 | ? SvPVX(GvSV(CopFILEGV(c))) : NULL) |
| 221 | # define CopSTASH(c) ((c)->cop_stash) |
| 222 | # define CopLABEL(c) ((c)->cop_label) |
| 223 | # define CopSTASH_set(c,hv) ((c)->cop_stash = (hv)) |
| 224 | # define CopSTASHPV(c) (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL) |
| 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)) |
| 228 | # define CopLABEL_alloc(pv) ((pv)?savepv(pv):NULL) |
| 229 | # define CopLABEL_set(c,pv) (CopLABEL(c) = (pv)) |
| 230 | # define CopSTASH_free(c) |
| 231 | # define CopFILE_free(c) (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL)) |
| 232 | # define CopLABEL_free(c) (Safefree(CopLABEL(c)),(CopLABEL(c) = NULL)) |
| 233 | |
| 234 | #endif /* USE_ITHREADS */ |
| 235 | |
| 236 | #define CopSTASH_ne(c,hv) (!CopSTASH_eq(c,hv)) |
| 237 | #define CopLINE(c) ((c)->cop_line) |
| 238 | #define CopLINE_inc(c) (++CopLINE(c)) |
| 239 | #define CopLINE_dec(c) (--CopLINE(c)) |
| 240 | #define CopLINE_set(c,l) (CopLINE(c) = (l)) |
| 241 | |
| 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 | |
| 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 $[ is highly discouraged, no sane Perl code will be using it. */ |
| 253 | #define CopARYBASE_get(c) \ |
| 254 | ((CopHINTS_get(c) & HINT_ARYBASE) \ |
| 255 | ? SvIV(Perl_refcounted_he_fetch(aTHX_ (c)->cop_hints_hash, 0, \ |
| 256 | "$[", 2, 0, 0)) \ |
| 257 | : 0) |
| 258 | #define CopARYBASE_set(c, b) STMT_START { \ |
| 259 | if (b || ((c)->cop_hints & HINT_ARYBASE)) { \ |
| 260 | (c)->cop_hints |= HINT_ARYBASE; \ |
| 261 | if ((c) == &PL_compiling) \ |
| 262 | PL_hints |= HINT_LOCALIZE_HH | HINT_ARYBASE; \ |
| 263 | (c)->cop_hints_hash \ |
| 264 | = Perl_refcounted_he_new(aTHX_ (c)->cop_hints_hash, \ |
| 265 | newSVpvs_flags("$[", SVs_TEMP), \ |
| 266 | sv_2mortal(newSViv(b))); \ |
| 267 | } \ |
| 268 | } STMT_END |
| 269 | |
| 270 | /* FIXME NATIVE_HINTS if this is changed from op_private (see perl.h) */ |
| 271 | #define CopHINTS_get(c) ((c)->cop_hints + 0) |
| 272 | #define CopHINTS_set(c, h) STMT_START { \ |
| 273 | (c)->cop_hints = (h); \ |
| 274 | } STMT_END |
| 275 | |
| 276 | /* |
| 277 | * Here we have some enormously heavy (or at least ponderous) wizardry. |
| 278 | */ |
| 279 | |
| 280 | /* subroutine context */ |
| 281 | struct block_sub { |
| 282 | OP * retop; /* op to execute on exit from sub */ |
| 283 | /* Above here is the same for sub, format and eval. */ |
| 284 | CV * cv; |
| 285 | /* Above here is the same for sub and format. */ |
| 286 | AV * savearray; |
| 287 | AV * argarray; |
| 288 | I32 olddepth; |
| 289 | PAD *oldcomppad; |
| 290 | }; |
| 291 | |
| 292 | |
| 293 | /* format context */ |
| 294 | struct block_format { |
| 295 | OP * retop; /* op to execute on exit from sub */ |
| 296 | /* Above here is the same for sub, format and eval. */ |
| 297 | CV * cv; |
| 298 | /* Above here is the same for sub and format. */ |
| 299 | GV * gv; |
| 300 | GV * dfoutgv; |
| 301 | }; |
| 302 | |
| 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 | |
| 307 | #define PUSHSUB_BASE(cx) \ |
| 308 | ENTRY_PROBE(GvENAME(CvGV(cv)), \ |
| 309 | CopFILE((COP*)CvSTART(cv)), \ |
| 310 | CopLINE((COP*)CvSTART(cv))); \ |
| 311 | \ |
| 312 | cx->blk_sub.cv = cv; \ |
| 313 | cx->blk_sub.olddepth = CvDEPTH(cv); \ |
| 314 | cx->cx_type |= (hasargs) ? CXp_HASARGS : 0; \ |
| 315 | cx->blk_sub.retop = NULL; \ |
| 316 | if (!CvDEPTH(cv)) { \ |
| 317 | SvREFCNT_inc_simple_void_NN(cv); \ |
| 318 | SvREFCNT_inc_simple_void_NN(cv); \ |
| 319 | SAVEFREESV(cv); \ |
| 320 | } |
| 321 | |
| 322 | |
| 323 | #define PUSHSUB(cx) \ |
| 324 | PUSHSUB_BASE(cx) \ |
| 325 | cx->blk_u16 = PL_op->op_private & \ |
| 326 | (OPpLVAL_INTRO|OPpENTERSUB_INARGS); |
| 327 | |
| 328 | /* variant for use by OP_DBSTATE, where op_private holds hint bits */ |
| 329 | #define PUSHSUB_DB(cx) \ |
| 330 | PUSHSUB_BASE(cx) \ |
| 331 | cx->blk_u16 = 0; |
| 332 | |
| 333 | |
| 334 | #define PUSHFORMAT(cx, retop) \ |
| 335 | cx->blk_format.cv = cv; \ |
| 336 | cx->blk_format.gv = gv; \ |
| 337 | cx->blk_format.retop = (retop); \ |
| 338 | cx->blk_format.dfoutgv = PL_defoutgv; \ |
| 339 | SvREFCNT_inc_void(cx->blk_format.dfoutgv) |
| 340 | |
| 341 | #define POP_SAVEARRAY() \ |
| 342 | STMT_START { \ |
| 343 | SvREFCNT_dec(GvAV(PL_defgv)); \ |
| 344 | GvAV(PL_defgv) = cx->blk_sub.savearray; \ |
| 345 | } STMT_END |
| 346 | |
| 347 | /* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't |
| 348 | * leave any (a fast av_clear(ary), basically) */ |
| 349 | #define CLEAR_ARGARRAY(ary) \ |
| 350 | STMT_START { \ |
| 351 | AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary); \ |
| 352 | AvARRAY(ary) = AvALLOC(ary); \ |
| 353 | AvFILLp(ary) = -1; \ |
| 354 | } STMT_END |
| 355 | |
| 356 | #define POPSUB(cx,sv) \ |
| 357 | STMT_START { \ |
| 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 | \ |
| 362 | if (CxHASARGS(cx)) { \ |
| 363 | POP_SAVEARRAY(); \ |
| 364 | /* abandon @_ if it got reified */ \ |
| 365 | if (AvREAL(cx->blk_sub.argarray)) { \ |
| 366 | const SSize_t fill = AvFILLp(cx->blk_sub.argarray); \ |
| 367 | SvREFCNT_dec(cx->blk_sub.argarray); \ |
| 368 | cx->blk_sub.argarray = newAV(); \ |
| 369 | av_extend(cx->blk_sub.argarray, fill); \ |
| 370 | AvREIFY_only(cx->blk_sub.argarray); \ |
| 371 | CX_CURPAD_SV(cx->blk_sub, 0) = (SV*)cx->blk_sub.argarray; \ |
| 372 | } \ |
| 373 | else { \ |
| 374 | CLEAR_ARGARRAY(cx->blk_sub.argarray); \ |
| 375 | } \ |
| 376 | } \ |
| 377 | sv = (SV*)cx->blk_sub.cv; \ |
| 378 | if (sv && (CvDEPTH((CV*)sv) = cx->blk_sub.olddepth)) \ |
| 379 | sv = NULL; \ |
| 380 | } STMT_END |
| 381 | |
| 382 | #define LEAVESUB(sv) \ |
| 383 | STMT_START { \ |
| 384 | if (sv) \ |
| 385 | SvREFCNT_dec(sv); \ |
| 386 | } STMT_END |
| 387 | |
| 388 | #define POPFORMAT(cx) \ |
| 389 | setdefout(cx->blk_format.dfoutgv); \ |
| 390 | SvREFCNT_dec(cx->blk_format.dfoutgv); |
| 391 | |
| 392 | /* eval context */ |
| 393 | struct block_eval { |
| 394 | OP * retop; /* op to execute on exit from eval */ |
| 395 | /* Above here is the same for sub, format and eval. */ |
| 396 | SV * old_namesv; |
| 397 | OP * old_eval_root; |
| 398 | SV * cur_text; |
| 399 | CV * cv; |
| 400 | JMPENV * cur_top_env; /* value of PL_top_env when eval CX created */ |
| 401 | }; |
| 402 | |
| 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) |
| 409 | |
| 410 | #define PUSHEVAL(cx,n,fgv) \ |
| 411 | STMT_START { \ |
| 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); \ |
| 415 | cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL); \ |
| 416 | cx->blk_eval.old_eval_root = PL_eval_root; \ |
| 417 | cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL; \ |
| 418 | cx->blk_eval.cv = NULL; /* set by doeval(), as applicable */ \ |
| 419 | cx->blk_eval.retop = NULL; \ |
| 420 | cx->blk_eval.cur_top_env = PL_top_env; \ |
| 421 | } STMT_END |
| 422 | |
| 423 | #define POPEVAL(cx) \ |
| 424 | STMT_START { \ |
| 425 | PL_in_eval = CxOLD_IN_EVAL(cx); \ |
| 426 | optype = CxOLD_OP_TYPE(cx); \ |
| 427 | PL_eval_root = cx->blk_eval.old_eval_root; \ |
| 428 | if (cx->blk_eval.old_namesv) \ |
| 429 | sv_2mortal(cx->blk_eval.old_namesv); \ |
| 430 | } STMT_END |
| 431 | |
| 432 | /* loop context */ |
| 433 | struct block_loop { |
| 434 | I32 resetsp; |
| 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.) */ |
| 438 | #ifdef USE_ITHREADS |
| 439 | void * iterdata; |
| 440 | PAD *oldcomppad; |
| 441 | #else |
| 442 | OP * next_op; |
| 443 | SV ** itervar; |
| 444 | #endif |
| 445 | SV * itersave; |
| 446 | /* (from inspection of source code) for a .. range of strings this is the |
| 447 | current string. */ |
| 448 | SV * iterlval; |
| 449 | /* (from inspection of source code) for a foreach loop this is the array |
| 450 | being iterated over. For a .. range of numbers it's the current value. |
| 451 | A check is often made on the SvTYPE of iterary to determine whether |
| 452 | we are iterating over an array or a range. (numbers or strings) */ |
| 453 | AV * iterary; |
| 454 | IV iterix; |
| 455 | /* (from inspection of source code) for a .. range of numbers this is the |
| 456 | maximum value. */ |
| 457 | IV itermax; |
| 458 | }; |
| 459 | /* It might be possible to squeeze this structure further. As best I can tell |
| 460 | itermax and iterlval are never used at the same time, so it might be possible |
| 461 | to make them into a union. However, I'm not confident that there are enough |
| 462 | flag bits/NULLable pointers in this structure alone to encode which is |
| 463 | active. There is, however, U8 of space free in struct block, which could be |
| 464 | used. Right now it may not be worth squeezing this structure further, as it's |
| 465 | the largest part of struct block, and currently struct block is 64 bytes on |
| 466 | an ILP32 system, which will give good cache alignment. |
| 467 | */ |
| 468 | |
| 469 | #ifdef USE_ITHREADS |
| 470 | # define CxITERVAR(c) \ |
| 471 | ((c)->blk_loop.iterdata \ |
| 472 | ? (CxPADLOOP(cx) \ |
| 473 | ? &CX_CURPAD_SV( (c)->blk_loop, \ |
| 474 | INT2PTR(PADOFFSET, (c)->blk_loop.iterdata)) \ |
| 475 | : &GvSV((GV*)(c)->blk_loop.iterdata)) \ |
| 476 | : (SV**)NULL) |
| 477 | # define CX_ITERDATA_SET(cx,idata) \ |
| 478 | CX_CURPAD_SAVE(cx->blk_loop); \ |
| 479 | if ((cx->blk_loop.iterdata = (idata))) \ |
| 480 | cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \ |
| 481 | else \ |
| 482 | cx->blk_loop.itersave = NULL; |
| 483 | #else |
| 484 | # define CxITERVAR(c) ((c)->blk_loop.itervar) |
| 485 | # define CX_ITERDATA_SET(cx,ivar) \ |
| 486 | if ((cx->blk_loop.itervar = (SV**)(ivar))) \ |
| 487 | cx->blk_loop.itersave = SvREFCNT_inc(*CxITERVAR(cx)); \ |
| 488 | else \ |
| 489 | cx->blk_loop.itersave = NULL; |
| 490 | #endif |
| 491 | #define CxLABEL(c) (0 + (c)->blk_oldcop->cop_label) |
| 492 | #define CxHASARGS(c) (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS) |
| 493 | #define CxLVAL(c) (0 + (c)->blk_u16) |
| 494 | |
| 495 | #ifdef USE_ITHREADS |
| 496 | # define PUSHLOOP_OP_NEXT /* No need to do anything. */ |
| 497 | # define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.my_op->op_nextop + 0) |
| 498 | #else |
| 499 | # define PUSHLOOP_OP_NEXT cx->blk_loop.next_op = cLOOP->op_nextop |
| 500 | # define CX_LOOP_NEXTOP_GET(cx) ((cx)->blk_loop.next_op + 0) |
| 501 | #endif |
| 502 | |
| 503 | #define PUSHLOOP(cx, dat, s) \ |
| 504 | cx->blk_loop.resetsp = s - PL_stack_base; \ |
| 505 | cx->blk_loop.my_op = cLOOP; \ |
| 506 | PUSHLOOP_OP_NEXT; \ |
| 507 | cx->blk_loop.iterlval = NULL; \ |
| 508 | cx->blk_loop.iterary = NULL; \ |
| 509 | cx->blk_loop.iterix = -1; \ |
| 510 | CX_ITERDATA_SET(cx,dat); |
| 511 | |
| 512 | #define POPLOOP(cx) \ |
| 513 | SvREFCNT_dec(cx->blk_loop.iterlval); \ |
| 514 | if (CxITERVAR(cx)) { \ |
| 515 | if (SvPADMY(cx->blk_loop.itersave)) { \ |
| 516 | SV ** const s_v_p = CxITERVAR(cx); \ |
| 517 | sv_2mortal(*s_v_p); \ |
| 518 | *s_v_p = cx->blk_loop.itersave; \ |
| 519 | } \ |
| 520 | else { \ |
| 521 | SvREFCNT_dec(cx->blk_loop.itersave); \ |
| 522 | } \ |
| 523 | } \ |
| 524 | if (cx->blk_loop.iterary && cx->blk_loop.iterary != PL_curstack)\ |
| 525 | SvREFCNT_dec(cx->blk_loop.iterary); |
| 526 | |
| 527 | /* given/when context */ |
| 528 | struct block_givwhen { |
| 529 | OP *leave_op; |
| 530 | }; |
| 531 | |
| 532 | #define PUSHGIVEN(cx) \ |
| 533 | cx->blk_givwhen.leave_op = cLOGOP->op_other; |
| 534 | |
| 535 | #define PUSHWHEN PUSHGIVEN |
| 536 | |
| 537 | /* context common to subroutines, evals and loops */ |
| 538 | struct block { |
| 539 | U8 blku_type; /* what kind of context this is */ |
| 540 | U8 blku_gimme; /* is this block running in list context? */ |
| 541 | U16 blku_u16; /* used by block_sub and block_eval (so far) */ |
| 542 | I32 blku_oldsp; /* stack pointer to copy stuff down to */ |
| 543 | COP * blku_oldcop; /* old curcop pointer */ |
| 544 | I32 blku_oldmarksp; /* mark stack index */ |
| 545 | I32 blku_oldscopesp; /* scope stack index */ |
| 546 | PMOP * blku_oldpm; /* values of pattern match vars */ |
| 547 | |
| 548 | union { |
| 549 | struct block_sub blku_sub; |
| 550 | struct block_format blku_format; |
| 551 | struct block_eval blku_eval; |
| 552 | struct block_loop blku_loop; |
| 553 | struct block_givwhen blku_givwhen; |
| 554 | } blk_u; |
| 555 | }; |
| 556 | #define blk_oldsp cx_u.cx_blk.blku_oldsp |
| 557 | #define blk_oldcop cx_u.cx_blk.blku_oldcop |
| 558 | #define blk_oldmarksp cx_u.cx_blk.blku_oldmarksp |
| 559 | #define blk_oldscopesp cx_u.cx_blk.blku_oldscopesp |
| 560 | #define blk_oldpm cx_u.cx_blk.blku_oldpm |
| 561 | #define blk_gimme cx_u.cx_blk.blku_gimme |
| 562 | #define blk_u16 cx_u.cx_blk.blku_u16 |
| 563 | #define blk_sub cx_u.cx_blk.blk_u.blku_sub |
| 564 | #define blk_format cx_u.cx_blk.blk_u.blku_format |
| 565 | #define blk_eval cx_u.cx_blk.blk_u.blku_eval |
| 566 | #define blk_loop cx_u.cx_blk.blk_u.blku_loop |
| 567 | #define blk_givwhen cx_u.cx_blk.blk_u.blku_givwhen |
| 568 | |
| 569 | /* Enter a block. */ |
| 570 | #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix], \ |
| 571 | cx->cx_type = t, \ |
| 572 | cx->blk_oldsp = sp - PL_stack_base, \ |
| 573 | cx->blk_oldcop = PL_curcop, \ |
| 574 | cx->blk_oldmarksp = PL_markstack_ptr - PL_markstack, \ |
| 575 | cx->blk_oldscopesp = PL_scopestack_ix, \ |
| 576 | cx->blk_oldpm = PL_curpm, \ |
| 577 | cx->blk_gimme = (U8)gimme; \ |
| 578 | DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \ |
| 579 | (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); ) |
| 580 | |
| 581 | /* Exit a block (RETURN and LAST). */ |
| 582 | #define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--], \ |
| 583 | newsp = PL_stack_base + cx->blk_oldsp, \ |
| 584 | PL_curcop = cx->blk_oldcop, \ |
| 585 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \ |
| 586 | PL_scopestack_ix = cx->blk_oldscopesp, \ |
| 587 | pm = cx->blk_oldpm, \ |
| 588 | gimme = cx->blk_gimme; \ |
| 589 | DEBUG_SCOPE("POPBLOCK"); \ |
| 590 | DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n", \ |
| 591 | (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); ) |
| 592 | |
| 593 | /* Continue a block elsewhere (NEXT and REDO). */ |
| 594 | #define TOPBLOCK(cx) cx = &cxstack[cxstack_ix], \ |
| 595 | PL_stack_sp = PL_stack_base + cx->blk_oldsp, \ |
| 596 | PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp, \ |
| 597 | PL_scopestack_ix = cx->blk_oldscopesp, \ |
| 598 | PL_curpm = cx->blk_oldpm; \ |
| 599 | DEBUG_SCOPE("TOPBLOCK"); |
| 600 | |
| 601 | /* substitution context */ |
| 602 | struct subst { |
| 603 | U8 sbu_type; /* what kind of context this is */ |
| 604 | U8 sbu_rflags; |
| 605 | U16 sbu_rxtainted; /* matches struct block */ |
| 606 | I32 sbu_iters; |
| 607 | I32 sbu_maxiters; |
| 608 | I32 sbu_oldsave; |
| 609 | char * sbu_orig; |
| 610 | SV * sbu_dstr; |
| 611 | SV * sbu_targ; |
| 612 | char * sbu_s; |
| 613 | char * sbu_m; |
| 614 | char * sbu_strend; |
| 615 | void * sbu_rxres; |
| 616 | REGEXP * sbu_rx; |
| 617 | }; |
| 618 | #define sb_iters cx_u.cx_subst.sbu_iters |
| 619 | #define sb_maxiters cx_u.cx_subst.sbu_maxiters |
| 620 | #define sb_rflags cx_u.cx_subst.sbu_rflags |
| 621 | #define sb_oldsave cx_u.cx_subst.sbu_oldsave |
| 622 | #define sb_once cx_u.cx_subst.sbu_once |
| 623 | #define sb_rxtainted cx_u.cx_subst.sbu_rxtainted |
| 624 | #define sb_orig cx_u.cx_subst.sbu_orig |
| 625 | #define sb_dstr cx_u.cx_subst.sbu_dstr |
| 626 | #define sb_targ cx_u.cx_subst.sbu_targ |
| 627 | #define sb_s cx_u.cx_subst.sbu_s |
| 628 | #define sb_m cx_u.cx_subst.sbu_m |
| 629 | #define sb_strend cx_u.cx_subst.sbu_strend |
| 630 | #define sb_rxres cx_u.cx_subst.sbu_rxres |
| 631 | #define sb_rx cx_u.cx_subst.sbu_rx |
| 632 | |
| 633 | #define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix], \ |
| 634 | cx->sb_iters = iters, \ |
| 635 | cx->sb_maxiters = maxiters, \ |
| 636 | cx->sb_rflags = r_flags, \ |
| 637 | cx->sb_oldsave = oldsave, \ |
| 638 | cx->sb_rxtainted = rxtainted, \ |
| 639 | cx->sb_orig = orig, \ |
| 640 | cx->sb_dstr = dstr, \ |
| 641 | cx->sb_targ = targ, \ |
| 642 | cx->sb_s = s, \ |
| 643 | cx->sb_m = m, \ |
| 644 | cx->sb_strend = strend, \ |
| 645 | cx->sb_rxres = NULL, \ |
| 646 | cx->sb_rx = rx, \ |
| 647 | cx->cx_type = CXt_SUBST | (once ? CXp_ONCE : 0); \ |
| 648 | rxres_save(&cx->sb_rxres, rx); \ |
| 649 | (void)ReREFCNT_inc(rx) |
| 650 | |
| 651 | #define CxONCE(cx) ((cx)->cx_type & CXp_ONCE) |
| 652 | |
| 653 | #define POPSUBST(cx) cx = &cxstack[cxstack_ix--]; \ |
| 654 | rxres_free(&cx->sb_rxres); \ |
| 655 | ReREFCNT_dec(cx->sb_rx) |
| 656 | |
| 657 | struct context { |
| 658 | union { |
| 659 | struct block cx_blk; |
| 660 | struct subst cx_subst; |
| 661 | } cx_u; |
| 662 | }; |
| 663 | #define cx_type cx_u.cx_subst.sbu_type |
| 664 | |
| 665 | #define CXTYPEMASK 0xf |
| 666 | #define CXt_NULL 0 |
| 667 | #define CXt_SUB 1 |
| 668 | #define CXt_EVAL 2 |
| 669 | #define CXt_LOOP 3 |
| 670 | #define CXt_SUBST 4 |
| 671 | #define CXt_BLOCK 5 |
| 672 | #define CXt_FORMAT 6 |
| 673 | #define CXt_GIVEN 7 |
| 674 | #define CXt_WHEN 8 |
| 675 | |
| 676 | /* private flags for CXt_SUB and CXt_NULL |
| 677 | However, this is checked in many places which do not check the type, so |
| 678 | this bit needs to be kept clear for most everything else. For reasons I |
| 679 | haven't investigated, it can coexist with CXp_FOR_DEF */ |
| 680 | #define CXp_MULTICALL 0x10 /* part of a multicall (so don't |
| 681 | tear down context on exit). */ |
| 682 | |
| 683 | /* private flags for CXt_SUB and CXt_FORMAT */ |
| 684 | #define CXp_HASARGS 0x20 |
| 685 | |
| 686 | /* private flags for CXt_EVAL */ |
| 687 | #define CXp_REAL 0x20 /* truly eval'', not a lookalike */ |
| 688 | #define CXp_TRYBLOCK 0x40 /* eval{}, not eval'' or similar */ |
| 689 | |
| 690 | /* private flags for CXt_LOOP */ |
| 691 | #define CXp_FOR_DEF 0x10 /* foreach using $_ */ |
| 692 | #define CXp_FOREACH 0x20 /* a foreach loop */ |
| 693 | #ifdef USE_ITHREADS |
| 694 | # define CXp_PADVAR 0x40 /* itervar lives on pad, iterdata has pad |
| 695 | offset; if not set, iterdata holds GV* */ |
| 696 | # define CxPADLOOP(c) (((c)->cx_type & (CXt_LOOP|CXp_PADVAR)) \ |
| 697 | == (CXt_LOOP|CXp_PADVAR)) |
| 698 | #endif |
| 699 | /* private flags for CXt_SUBST */ |
| 700 | #define CXp_ONCE 0x10 /* What was sbu_once in struct subst */ |
| 701 | |
| 702 | #define CxTYPE(c) ((c)->cx_type & CXTYPEMASK) |
| 703 | #define CxMULTICALL(c) (((c)->cx_type & CXp_MULTICALL) \ |
| 704 | == CXp_MULTICALL) |
| 705 | #define CxREALEVAL(c) (((c)->cx_type & (CXTYPEMASK|CXp_REAL)) \ |
| 706 | == (CXt_EVAL|CXp_REAL)) |
| 707 | #define CxTRYBLOCK(c) (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK)) \ |
| 708 | == (CXt_EVAL|CXp_TRYBLOCK)) |
| 709 | #define CxFOREACH(c) (((c)->cx_type & (CXTYPEMASK|CXp_FOREACH)) \ |
| 710 | == (CXt_LOOP|CXp_FOREACH)) |
| 711 | #define CxFOREACHDEF(c) (((c)->cx_type & (CXTYPEMASK|CXp_FOREACH|CXp_FOR_DEF))\ |
| 712 | == (CXt_LOOP|CXp_FOREACH|CXp_FOR_DEF)) |
| 713 | |
| 714 | #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc())) |
| 715 | |
| 716 | /* |
| 717 | =head1 "Gimme" Values |
| 718 | */ |
| 719 | |
| 720 | /* |
| 721 | =for apidoc AmU||G_SCALAR |
| 722 | Used to indicate scalar context. See C<GIMME_V>, C<GIMME>, and |
| 723 | L<perlcall>. |
| 724 | |
| 725 | =for apidoc AmU||G_ARRAY |
| 726 | Used to indicate list context. See C<GIMME_V>, C<GIMME> and |
| 727 | L<perlcall>. |
| 728 | |
| 729 | =for apidoc AmU||G_VOID |
| 730 | Used to indicate void context. See C<GIMME_V> and L<perlcall>. |
| 731 | |
| 732 | =for apidoc AmU||G_DISCARD |
| 733 | Indicates that arguments returned from a callback should be discarded. See |
| 734 | L<perlcall>. |
| 735 | |
| 736 | =for apidoc AmU||G_EVAL |
| 737 | |
| 738 | Used to force a Perl C<eval> wrapper around a callback. See |
| 739 | L<perlcall>. |
| 740 | |
| 741 | =for apidoc AmU||G_NOARGS |
| 742 | |
| 743 | Indicates that no arguments are being sent to a callback. See |
| 744 | L<perlcall>. |
| 745 | |
| 746 | =cut |
| 747 | */ |
| 748 | |
| 749 | #define G_SCALAR 2 |
| 750 | #define G_ARRAY 3 |
| 751 | #define G_VOID 1 |
| 752 | #define G_WANT 3 |
| 753 | |
| 754 | /* extra flags for Perl_call_* routines */ |
| 755 | #define G_DISCARD 4 /* Call FREETMPS. |
| 756 | Don't change this without consulting the |
| 757 | hash actions codes defined in hv.h */ |
| 758 | #define G_EVAL 8 /* Assume eval {} around subroutine call. */ |
| 759 | #define G_NOARGS 16 /* Don't construct a @_ array. */ |
| 760 | #define G_KEEPERR 32 /* Append errors to $@, don't overwrite it */ |
| 761 | #define G_NODEBUG 64 /* Disable debugging at toplevel. */ |
| 762 | #define G_METHOD 128 /* Calling method. */ |
| 763 | #define G_FAKINGEVAL 256 /* Faking an eval context for call_sv or |
| 764 | fold_constants. */ |
| 765 | |
| 766 | /* flag bits for PL_in_eval */ |
| 767 | #define EVAL_NULL 0 /* not in an eval */ |
| 768 | #define EVAL_INEVAL 1 /* some enclosing scope is an eval */ |
| 769 | #define EVAL_WARNONLY 2 /* used by yywarn() when calling yyerror() */ |
| 770 | #define EVAL_KEEPERR 4 /* set by Perl_call_sv if G_KEEPERR */ |
| 771 | #define EVAL_INREQUIRE 8 /* The code is being required. */ |
| 772 | |
| 773 | /* Support for switching (stack and block) contexts. |
| 774 | * This ensures magic doesn't invalidate local stack and cx pointers. |
| 775 | */ |
| 776 | |
| 777 | #define PERLSI_UNKNOWN -1 |
| 778 | #define PERLSI_UNDEF 0 |
| 779 | #define PERLSI_MAIN 1 |
| 780 | #define PERLSI_MAGIC 2 |
| 781 | #define PERLSI_SORT 3 |
| 782 | #define PERLSI_SIGNAL 4 |
| 783 | #define PERLSI_OVERLOAD 5 |
| 784 | #define PERLSI_DESTROY 6 |
| 785 | #define PERLSI_WARNHOOK 7 |
| 786 | #define PERLSI_DIEHOOK 8 |
| 787 | #define PERLSI_REQUIRE 9 |
| 788 | |
| 789 | struct stackinfo { |
| 790 | AV * si_stack; /* stack for current runlevel */ |
| 791 | PERL_CONTEXT * si_cxstack; /* context stack for runlevel */ |
| 792 | struct stackinfo * si_prev; |
| 793 | struct stackinfo * si_next; |
| 794 | I32 si_cxix; /* current context index */ |
| 795 | I32 si_cxmax; /* maximum allocated index */ |
| 796 | I32 si_type; /* type of runlevel */ |
| 797 | I32 si_markoff; /* offset where markstack begins for us. |
| 798 | * currently used only with DEBUGGING, |
| 799 | * but not #ifdef-ed for bincompat */ |
| 800 | }; |
| 801 | |
| 802 | typedef struct stackinfo PERL_SI; |
| 803 | |
| 804 | #define cxstack (PL_curstackinfo->si_cxstack) |
| 805 | #define cxstack_ix (PL_curstackinfo->si_cxix) |
| 806 | #define cxstack_max (PL_curstackinfo->si_cxmax) |
| 807 | |
| 808 | #ifdef DEBUGGING |
| 809 | # define SET_MARK_OFFSET \ |
| 810 | PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack |
| 811 | #else |
| 812 | # define SET_MARK_OFFSET NOOP |
| 813 | #endif |
| 814 | |
| 815 | #define PUSHSTACKi(type) \ |
| 816 | STMT_START { \ |
| 817 | PERL_SI *next = PL_curstackinfo->si_next; \ |
| 818 | if (!next) { \ |
| 819 | next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1); \ |
| 820 | next->si_prev = PL_curstackinfo; \ |
| 821 | PL_curstackinfo->si_next = next; \ |
| 822 | } \ |
| 823 | next->si_type = type; \ |
| 824 | next->si_cxix = -1; \ |
| 825 | AvFILLp(next->si_stack) = 0; \ |
| 826 | SWITCHSTACK(PL_curstack,next->si_stack); \ |
| 827 | PL_curstackinfo = next; \ |
| 828 | SET_MARK_OFFSET; \ |
| 829 | } STMT_END |
| 830 | |
| 831 | #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN) |
| 832 | |
| 833 | /* POPSTACK works with PL_stack_sp, so it may need to be bracketed by |
| 834 | * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */ |
| 835 | #define POPSTACK \ |
| 836 | STMT_START { \ |
| 837 | dSP; \ |
| 838 | PERL_SI * const prev = PL_curstackinfo->si_prev; \ |
| 839 | if (!prev) { \ |
| 840 | PerlIO_printf(Perl_error_log, "panic: POPSTACK\n"); \ |
| 841 | my_exit(1); \ |
| 842 | } \ |
| 843 | SWITCHSTACK(PL_curstack,prev->si_stack); \ |
| 844 | /* don't free prev here, free them all at the END{} */ \ |
| 845 | PL_curstackinfo = prev; \ |
| 846 | } STMT_END |
| 847 | |
| 848 | #define POPSTACK_TO(s) \ |
| 849 | STMT_START { \ |
| 850 | while (PL_curstack != s) { \ |
| 851 | dounwind(-1); \ |
| 852 | POPSTACK; \ |
| 853 | } \ |
| 854 | } STMT_END |
| 855 | |
| 856 | #define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling) |
| 857 | #define IN_PERL_RUNTIME (PL_curcop != &PL_compiling) |
| 858 | |
| 859 | /* |
| 860 | =head1 Multicall Functions |
| 861 | |
| 862 | =for apidoc Ams||dMULTICALL |
| 863 | Declare local variables for a multicall. See L<perlcall/Lightweight Callbacks>. |
| 864 | |
| 865 | =for apidoc Ams||PUSH_MULTICALL |
| 866 | Opening bracket for a lightweight callback. |
| 867 | See L<perlcall/Lightweight Callbacks>. |
| 868 | |
| 869 | =for apidoc Ams||MULTICALL |
| 870 | Make a lightweight callback. See L<perlcall/Lightweight Callbacks>. |
| 871 | |
| 872 | =for apidoc Ams||POP_MULTICALL |
| 873 | Closing bracket for a lightweight callback. |
| 874 | See L<perlcall/Lightweight Callbacks>. |
| 875 | |
| 876 | =cut |
| 877 | */ |
| 878 | |
| 879 | #define dMULTICALL \ |
| 880 | SV **newsp; /* set by POPBLOCK */ \ |
| 881 | PERL_CONTEXT *cx; \ |
| 882 | CV *multicall_cv; \ |
| 883 | OP *multicall_cop; \ |
| 884 | bool multicall_oldcatch; \ |
| 885 | U8 hasargs = 0 /* used by PUSHSUB */ |
| 886 | |
| 887 | #define PUSH_MULTICALL(the_cv) \ |
| 888 | STMT_START { \ |
| 889 | CV * const _nOnclAshIngNamE_ = the_cv; \ |
| 890 | CV * const cv = _nOnclAshIngNamE_; \ |
| 891 | AV * const padlist = CvPADLIST(cv); \ |
| 892 | ENTER; \ |
| 893 | multicall_oldcatch = CATCH_GET; \ |
| 894 | SAVETMPS; SAVEVPTR(PL_op); \ |
| 895 | CATCH_SET(TRUE); \ |
| 896 | PUSHBLOCK(cx, CXt_SUB|CXp_MULTICALL, PL_stack_sp); \ |
| 897 | PUSHSUB(cx); \ |
| 898 | if (++CvDEPTH(cv) >= 2) { \ |
| 899 | PERL_STACK_OVERFLOW_CHECK(); \ |
| 900 | Perl_pad_push(aTHX_ padlist, CvDEPTH(cv)); \ |
| 901 | } \ |
| 902 | SAVECOMPPAD(); \ |
| 903 | PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv)); \ |
| 904 | multicall_cv = cv; \ |
| 905 | multicall_cop = CvSTART(cv); \ |
| 906 | } STMT_END |
| 907 | |
| 908 | #define MULTICALL \ |
| 909 | STMT_START { \ |
| 910 | PL_op = multicall_cop; \ |
| 911 | CALLRUNOPS(aTHX); \ |
| 912 | } STMT_END |
| 913 | |
| 914 | #define POP_MULTICALL \ |
| 915 | STMT_START { \ |
| 916 | LEAVESUB(multicall_cv); \ |
| 917 | CvDEPTH(multicall_cv)--; \ |
| 918 | POPBLOCK(cx,PL_curpm); \ |
| 919 | CATCH_SET(multicall_oldcatch); \ |
| 920 | LEAVE; \ |
| 921 | } STMT_END |
| 922 | |
| 923 | /* |
| 924 | * Local variables: |
| 925 | * c-indentation-style: bsd |
| 926 | * c-basic-offset: 4 |
| 927 | * indent-tabs-mode: t |
| 928 | * End: |
| 929 | * |
| 930 | * ex: set ts=8 sts=4 sw=4 noet: |
| 931 | */ |