cop.h

   1 /*    cop.h
   2  *
   3  *    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   4  *    2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 two ops OP_NEXTSTATE and OP_DBSTATE,
  10  * that (loosely speaking) are statement separators.
  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 PL_start_env initialized when perl starts, and
  18  * PL_top_env points to this initially, so PL_top_env should always be
  19  * non-null.
  20  *
  21  * Existence of a non-null PL_top_env->je_prev implies it is valid to call
  22  * longjmp() at that runlevel (we make sure PL_start_env.je_prev is always
  23  * null to ensure this).
  24  *
  25  * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
  26  * establish a local jmpenv to handle exception traps.  Care must be taken
  27  * to restore the previous value of je_mustcatch before exiting the
  28  * stack frame iff JMPENV_PUSH was not called in that stack frame.
  29  * GSAR 97-03-27
  30  */
  31
  32 struct jmpenv {
  33     struct jmpenv *     je_prev;
  34     Sigjmp_buf          je_buf;         /* uninit if je_prev is NULL */
  35     int                 je_ret;         /* last exception thrown */
  36     bool                je_mustcatch;   /* need to call longjmp()? */
  37     U16                 je_old_delaymagic; /* saved PL_delaymagic */
  38 };
  39
  40 typedef struct jmpenv JMPENV;
  41
  42 /*
  43  * How to build the first jmpenv.
  44  *
  45  * top_env needs to be non-zero. It points to an area
  46  * in which longjmp() stuff is stored, as C callstack
  47  * info there at least is thread specific this has to
  48  * be per-thread. Otherwise a 'die' in a thread gives
  49  * that thread the C stack of last thread to do an eval {}!
  50  */
  51
  52 #define JMPENV_BOOTSTRAP \
  53     STMT_START {                                \
  54         PERL_POISON_EXPR(PoisonNew(&PL_start_env, 1, JMPENV));\
  55         PL_top_env = &PL_start_env;             \
  56         PL_start_env.je_prev = NULL;            \
  57         PL_start_env.je_ret = -1;               \
  58         PL_start_env.je_mustcatch = TRUE;       \
  59         PL_start_env.je_old_delaymagic = 0;     \
  60     } STMT_END
  61
  62 /*
  63  *   PERL_FLEXIBLE_EXCEPTIONS
  64  *
  65  * All the flexible exceptions code has been removed.
  66  * See the following threads for details:
  67  *
  68  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-07/msg00378.html
  69  *
  70  * Joshua's original patches (which weren't applied) and discussion:
  71  *
  72  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01396.html
  73  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01489.html
  74  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01491.html
  75  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg01608.html
  76  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02144.html
  77  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1998-02/msg02998.html
  78  *
  79  * Chip's reworked patch and discussion:
  80  *
  81  *   http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/1999-03/msg00520.html
  82  *
  83  * The flaw in these patches (which went unnoticed at the time) was
  84  * that they moved some code that could potentially die() out of the
  85  * region protected by the setjmp()s.  This caused exceptions within
  86  * END blocks and such to not be handled by the correct setjmp().
  87  *
  88  * The original patches that introduces flexible exceptions were:
  89  *
  90  * http://perl5.git.perl.org/perl.git/commit/312caa8e97f1c7ee342a9895c2f0e749625b4929
  91  * http://perl5.git.perl.org/perl.git/commit/14dd3ad8c9bf82cf09798a22cc89a9862dfd6d1a
  92  *
  93  */
  94
  95 #define dJMPENV         JMPENV cur_env
  96
  97 #define JMPENV_PUSH(v) \
  98     STMT_START {                                                        \
  99         DEBUG_l({                                                       \
 100             int i = 0; JMPENV *p = PL_top_env;                          \
 101             while (p) { i++; p = p->je_prev; }                          \
 102             Perl_deb(aTHX_ "JUMPENV_PUSH level=%d at %s:%d\n",          \
 103                          i,  __FILE__, __LINE__);})                     \
 104         cur_env.je_prev = PL_top_env;                                   \
 105         cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK);              \
 106         PL_top_env = &cur_env;                                          \
 107         cur_env.je_mustcatch = FALSE;                                   \
 108         cur_env.je_old_delaymagic = PL_delaymagic;                      \
 109         (v) = cur_env.je_ret;                                           \
 110     } STMT_END
 111
 112 #define JMPENV_POP \
 113     STMT_START {                                                        \
 114         DEBUG_l({                                                       \
 115             int i = -1; JMPENV *p = PL_top_env;                         \
 116             while (p) { i++; p = p->je_prev; }                          \
 117             Perl_deb(aTHX_ "JUMPENV_POP level=%d at %s:%d\n",           \
 118                          i, __FILE__, __LINE__);})                      \
 119         assert(PL_top_env == &cur_env);                                 \
 120         PL_delaymagic = cur_env.je_old_delaymagic;                      \
 121         PL_top_env = cur_env.je_prev;                                   \
 122     } STMT_END
 123
 124 #define JMPENV_JUMP(v) \
 125     STMT_START {                                                \
 126         DEBUG_l({                                               \
 127             int i = -1; JMPENV *p = PL_top_env;                 \
 128             while (p) { i++; p = p->je_prev; }                  \
 129             Perl_deb(aTHX_ "JUMPENV_JUMP(%d) level=%d at %s:%d\n", \
 130                          (int)v, i, __FILE__, __LINE__);})      \
 131         if (PL_top_env->je_prev)                                \
 132             PerlProc_longjmp(PL_top_env->je_buf, (v));          \
 133         if ((v) == 2)                                           \
 134             PerlProc_exit(STATUS_EXIT);                         \
 135         PerlIO_printf(PerlIO_stderr(), "panic: top_env, v=%d\n", (int)v); \
 136         PerlProc_exit(1);                                       \
 137     } STMT_END
 138
 139 #define CATCH_GET               (PL_top_env->je_mustcatch)
 140 #define CATCH_SET(v) \
 141     STMT_START {                                                        \
 142         DEBUG_l(                                                        \
 143             Perl_deb(aTHX_                                              \
 144                 "JUMPLEVEL set catch %d => %d (for %p) at %s:%d\n",     \
 145                  PL_top_env->je_mustcatch, v, (void*)PL_top_env,        \
 146                  __FILE__, __LINE__);)                                  \
 147         PL_top_env->je_mustcatch = (v);                                 \
 148     } STMT_END
 149
 150 /*
 151 =head1 COP Hint Hashes
 152 */
 153
 154 typedef struct refcounted_he COPHH;
 155
 156 #define COPHH_KEY_UTF8 REFCOUNTED_HE_KEY_UTF8
 157
 158 /*
 159 =for apidoc Amx|SV *|cophh_fetch_pvn|const COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|U32 flags
 160
 161 Look up the entry in the cop hints hash C<cophh> with the key specified by
 162 C<keypv> and C<keylen>.  If C<flags> has the C<COPHH_KEY_UTF8> bit set,
 163 the key octets are interpreted as UTF-8, otherwise they are interpreted
 164 as Latin-1.  C<hash> is a precomputed hash of the key string, or zero if
 165 it has not been precomputed.  Returns a mortal scalar copy of the value
 166 associated with the key, or C<&PL_sv_placeholder> if there is no value
 167 associated with the key.
 168
 169 =cut
 170 */
 171
 172 #define cophh_fetch_pvn(cophh, keypv, keylen, hash, flags) \
 173     Perl_refcounted_he_fetch_pvn(aTHX_ cophh, keypv, keylen, hash, flags)
 174
 175 /*
 176 =for apidoc Amx|SV *|cophh_fetch_pvs|const COPHH *cophh|const char *key|U32 flags
 177
 178 Like L</cophh_fetch_pvn>, but takes a literal string instead of a
 179 string/length pair, and no precomputed hash.
 180
 181 =cut
 182 */
 183
 184 #define cophh_fetch_pvs(cophh, key, flags) \
 185     Perl_refcounted_he_fetch_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, flags)
 186
 187 /*
 188 =for apidoc Amx|SV *|cophh_fetch_pv|const COPHH *cophh|const char *key|U32 hash|U32 flags
 189
 190 Like L</cophh_fetch_pvn>, but takes a nul-terminated string instead of
 191 a string/length pair.
 192
 193 =cut
 194 */
 195
 196 #define cophh_fetch_pv(cophh, key, hash, flags) \
 197     Perl_refcounted_he_fetch_pv(aTHX_ cophh, key, hash, flags)
 198
 199 /*
 200 =for apidoc Amx|SV *|cophh_fetch_sv|const COPHH *cophh|SV *key|U32 hash|U32 flags
 201
 202 Like L</cophh_fetch_pvn>, but takes a Perl scalar instead of a
 203 string/length pair.
 204
 205 =cut
 206 */
 207
 208 #define cophh_fetch_sv(cophh, key, hash, flags) \
 209     Perl_refcounted_he_fetch_sv(aTHX_ cophh, key, hash, flags)
 210
 211 /*
 212 =for apidoc Amx|HV *|cophh_2hv|const COPHH *cophh|U32 flags
 213
 214 Generates and returns a standard Perl hash representing the full set of
 215 key/value pairs in the cop hints hash C<cophh>.  C<flags> is currently
 216 unused and must be zero.
 217
 218 =cut
 219 */
 220
 221 #define cophh_2hv(cophh, flags) \
 222     Perl_refcounted_he_chain_2hv(aTHX_ cophh, flags)
 223
 224 /*
 225 =for apidoc Amx|COPHH *|cophh_copy|COPHH *cophh
 226
 227 Make and return a complete copy of the cop hints hash C<cophh>.
 228
 229 =cut
 230 */
 231
 232 #define cophh_copy(cophh) Perl_refcounted_he_inc(aTHX_ cophh)
 233
 234 /*
 235 =for apidoc Amx|void|cophh_free|COPHH *cophh
 236
 237 Discard the cop hints hash C<cophh>, freeing all resources associated
 238 with it.
 239
 240 =cut
 241 */
 242
 243 #define cophh_free(cophh) Perl_refcounted_he_free(aTHX_ cophh)
 244
 245 /*
 246 =for apidoc Amx|COPHH *|cophh_new_empty
 247
 248 Generate and return a fresh cop hints hash containing no entries.
 249
 250 =cut
 251 */
 252
 253 #define cophh_new_empty() ((COPHH *)NULL)
 254
 255 /*
 256 =for apidoc Amx|COPHH *|cophh_store_pvn|COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|SV *value|U32 flags
 257
 258 Stores a value, associated with a key, in the cop hints hash C<cophh>,
 259 and returns the modified hash.  The returned hash pointer is in general
 260 not the same as the hash pointer that was passed in.  The input hash is
 261 consumed by the function, and the pointer to it must not be subsequently
 262 used.  Use L</cophh_copy> if you need both hashes.
 263
 264 The key is specified by C<keypv> and C<keylen>.  If C<flags> has the
 265 C<COPHH_KEY_UTF8> bit set, the key octets are interpreted as UTF-8,
 266 otherwise they are interpreted as Latin-1.  C<hash> is a precomputed
 267 hash of the key string, or zero if it has not been precomputed.
 268
 269 C<value> is the scalar value to store for this key.  C<value> is copied
 270 by this function, which thus does not take ownership of any reference
 271 to it, and later changes to the scalar will not be reflected in the
 272 value visible in the cop hints hash.  Complex types of scalar will not
 273 be stored with referential integrity, but will be coerced to strings.
 274
 275 =cut
 276 */
 277
 278 #define cophh_store_pvn(cophh, keypv, keylen, hash, value, flags) \
 279     Perl_refcounted_he_new_pvn(aTHX_ cophh, keypv, keylen, hash, value, flags)
 280
 281 /*
 282 =for apidoc Amx|COPHH *|cophh_store_pvs|const COPHH *cophh|const char *key|SV *value|U32 flags
 283
 284 Like L</cophh_store_pvn>, but takes a literal string instead of a
 285 string/length pair, and no precomputed hash.
 286
 287 =cut
 288 */
 289
 290 #define cophh_store_pvs(cophh, key, value, flags) \
 291     Perl_refcounted_he_new_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, value, flags)
 292
 293 /*
 294 =for apidoc Amx|COPHH *|cophh_store_pv|const COPHH *cophh|const char *key|U32 hash|SV *value|U32 flags
 295
 296 Like L</cophh_store_pvn>, but takes a nul-terminated string instead of
 297 a string/length pair.
 298
 299 =cut
 300 */
 301
 302 #define cophh_store_pv(cophh, key, hash, value, flags) \
 303     Perl_refcounted_he_new_pv(aTHX_ cophh, key, hash, value, flags)
 304
 305 /*
 306 =for apidoc Amx|COPHH *|cophh_store_sv|const COPHH *cophh|SV *key|U32 hash|SV *value|U32 flags
 307
 308 Like L</cophh_store_pvn>, but takes a Perl scalar instead of a
 309 string/length pair.
 310
 311 =cut
 312 */
 313
 314 #define cophh_store_sv(cophh, key, hash, value, flags) \
 315     Perl_refcounted_he_new_sv(aTHX_ cophh, key, hash, value, flags)
 316
 317 /*
 318 =for apidoc Amx|COPHH *|cophh_delete_pvn|COPHH *cophh|const char *keypv|STRLEN keylen|U32 hash|U32 flags
 319
 320 Delete a key and its associated value from the cop hints hash C<cophh>,
 321 and returns the modified hash.  The returned hash pointer is in general
 322 not the same as the hash pointer that was passed in.  The input hash is
 323 consumed by the function, and the pointer to it must not be subsequently
 324 used.  Use L</cophh_copy> if you need both hashes.
 325
 326 The key is specified by C<keypv> and C<keylen>.  If C<flags> has the
 327 C<COPHH_KEY_UTF8> bit set, the key octets are interpreted as UTF-8,
 328 otherwise they are interpreted as Latin-1.  C<hash> is a precomputed
 329 hash of the key string, or zero if it has not been precomputed.
 330
 331 =cut
 332 */
 333
 334 #define cophh_delete_pvn(cophh, keypv, keylen, hash, flags) \
 335     Perl_refcounted_he_new_pvn(aTHX_ cophh, keypv, keylen, hash, \
 336         (SV *)NULL, flags)
 337
 338 /*
 339 =for apidoc Amx|COPHH *|cophh_delete_pvs|const COPHH *cophh|const char *key|U32 flags
 340
 341 Like L</cophh_delete_pvn>, but takes a literal string instead of a
 342 string/length pair, and no precomputed hash.
 343
 344 =cut
 345 */
 346
 347 #define cophh_delete_pvs(cophh, key, flags) \
 348     Perl_refcounted_he_new_pvn(aTHX_ cophh, STR_WITH_LEN(key), 0, \
 349         (SV *)NULL, flags)
 350
 351 /*
 352 =for apidoc Amx|COPHH *|cophh_delete_pv|const COPHH *cophh|const char *key|U32 hash|U32 flags
 353
 354 Like L</cophh_delete_pvn>, but takes a nul-terminated string instead of
 355 a string/length pair.
 356
 357 =cut
 358 */
 359
 360 #define cophh_delete_pv(cophh, key, hash, flags) \
 361     Perl_refcounted_he_new_pv(aTHX_ cophh, key, hash, (SV *)NULL, flags)
 362
 363 /*
 364 =for apidoc Amx|COPHH *|cophh_delete_sv|const COPHH *cophh|SV *key|U32 hash|U32 flags
 365
 366 Like L</cophh_delete_pvn>, but takes a Perl scalar instead of a
 367 string/length pair.
 368
 369 =cut
 370 */
 371
 372 #define cophh_delete_sv(cophh, key, hash, flags) \
 373     Perl_refcounted_he_new_sv(aTHX_ cophh, key, hash, (SV *)NULL, flags)
 374
 375 #include "mydtrace.h"
 376
 377 struct cop {
 378     BASEOP
 379     /* On LP64 putting this here takes advantage of the fact that BASEOP isn't
 380        an exact multiple of 8 bytes to save structure padding.  */
 381     line_t      cop_line;       /* line # of this command */
 382     /* label for this construct is now stored in cop_hints_hash */
 383 #ifdef USE_ITHREADS
 384     PADOFFSET   cop_stashoff;   /* offset into PL_stashpad, for the
 385                                    package the line was compiled in */
 386     char *      cop_file;       /* file name the following line # is from */
 387 #else
 388     HV *        cop_stash;      /* package line was compiled in */
 389     GV *        cop_filegv;     /* file the following line # is from */
 390 #endif
 391     U32         cop_hints;      /* hints bits from pragmata */
 392     U32         cop_seq;        /* parse sequence number */
 393     /* Beware. mg.c and warnings.pl assume the type of this is STRLEN *:  */
 394     STRLEN *    cop_warnings;   /* lexical warnings bitmask */
 395     /* compile time state of %^H.  See the comment in op.c for how this is
 396        used to recreate a hash to return from caller.  */
 397     COPHH *     cop_hints_hash;
 398 };
 399
 400 #ifdef USE_ITHREADS
 401 #  define CopFILE(c)            ((c)->cop_file)
 402 #  define CopFILEGV(c)          (CopFILE(c) \
 403                                  ? gv_fetchfile(CopFILE(c)) : NULL)
 404
 405 #  ifdef NETWARE
 406 #    define CopFILE_set(c,pv)   ((c)->cop_file = savepv(pv))
 407 #    define CopFILE_setn(c,pv,l)  ((c)->cop_file = savepvn((pv),(l)))
 408 #  else
 409 #    define CopFILE_set(c,pv)   ((c)->cop_file = savesharedpv(pv))
 410 #    define CopFILE_setn(c,pv,l)  ((c)->cop_file = savesharedpvn((pv),(l)))
 411 #  endif
 412
 413 #  define CopFILESV(c)          (CopFILE(c) \
 414                                  ? GvSV(gv_fetchfile(CopFILE(c))) : NULL)
 415 #  define CopFILEAV(c)          (CopFILE(c) \
 416                                  ? GvAV(gv_fetchfile(CopFILE(c))) : NULL)
 417 #  define CopFILEAVx(c)         (assert_(CopFILE(c)) \
 418                                    GvAV(gv_fetchfile(CopFILE(c))))
 419
 420 #  define CopSTASH(c)           PL_stashpad[(c)->cop_stashoff]
 421 #  define CopSTASH_set(c,hv)    ((c)->cop_stashoff = (hv)               \
 422                                     ? alloccopstash(hv)                 \
 423                                     : 0)
 424 #  ifdef NETWARE
 425 #    define CopFILE_free(c) SAVECOPFILE_FREE(c)
 426 #  else
 427 #    define CopFILE_free(c)     (PerlMemShared_free(CopFILE(c)),(CopFILE(c) = NULL))
 428 #  endif
 429 #else
 430 #  define CopFILEGV(c)          ((c)->cop_filegv)
 431 #  define CopFILEGV_set(c,gv)   ((c)->cop_filegv = (GV*)SvREFCNT_inc(gv))
 432 #  define CopFILE_set(c,pv)     CopFILEGV_set((c), gv_fetchfile(pv))
 433 #  define CopFILE_setn(c,pv,l)  CopFILEGV_set((c), gv_fetchfile_flags((pv),(l),0))
 434 #  define CopFILESV(c)          (CopFILEGV(c) ? GvSV(CopFILEGV(c)) : NULL)
 435 #  define CopFILEAV(c)          (CopFILEGV(c) ? GvAV(CopFILEGV(c)) : NULL)
 436 #  ifdef DEBUGGING
 437 #    define CopFILEAVx(c)       (assert(CopFILEGV(c)), GvAV(CopFILEGV(c)))
 438 #  else
 439 #    define CopFILEAVx(c)       (GvAV(CopFILEGV(c)))
 440 # endif
 441 #  define CopFILE(c)            (CopFILEGV(c) \
 442                                     ? GvNAME(CopFILEGV(c))+2 : NULL)
 443 #  define CopSTASH(c)           ((c)->cop_stash)
 444 #  define CopSTASH_set(c,hv)    ((c)->cop_stash = (hv))
 445 #  define CopFILE_free(c)       (SvREFCNT_dec(CopFILEGV(c)),(CopFILEGV(c) = NULL))
 446
 447 #endif /* USE_ITHREADS */
 448
 449 #define CopSTASHPV(c)           (CopSTASH(c) ? HvNAME_get(CopSTASH(c)) : NULL)
 450    /* cop_stash is not refcounted */
 451 #define CopSTASHPV_set(c,pv)    CopSTASH_set((c), gv_stashpv(pv,GV_ADD))
 452 #define CopSTASH_eq(c,hv)       (CopSTASH(c) == (hv))
 453
 454 #define CopHINTHASH_get(c)      ((COPHH*)((c)->cop_hints_hash))
 455 #define CopHINTHASH_set(c,h)    ((c)->cop_hints_hash = (h))
 456
 457 /*
 458 =head1 COP Hint Reading
 459 */
 460
 461 /*
 462 =for apidoc Am|SV *|cop_hints_fetch_pvn|const COP *cop|const char *keypv|STRLEN keylen|U32 hash|U32 flags
 463
 464 Look up the hint entry in the cop C<cop> with the key specified by
 465 C<keypv> and C<keylen>.  If C<flags> has the C<COPHH_KEY_UTF8> bit set,
 466 the key octets are interpreted as UTF-8, otherwise they are interpreted
 467 as Latin-1.  C<hash> is a precomputed hash of the key string, or zero if
 468 it has not been precomputed.  Returns a mortal scalar copy of the value
 469 associated with the key, or C<&PL_sv_placeholder> if there is no value
 470 associated with the key.
 471
 472 =cut
 473 */
 474
 475 #define cop_hints_fetch_pvn(cop, keypv, keylen, hash, flags) \
 476     cophh_fetch_pvn(CopHINTHASH_get(cop), keypv, keylen, hash, flags)
 477
 478 /*
 479 =for apidoc Am|SV *|cop_hints_fetch_pvs|const COP *cop|const char *key|U32 flags
 480
 481 Like L</cop_hints_fetch_pvn>, but takes a literal string instead of a
 482 string/length pair, and no precomputed hash.
 483
 484 =cut
 485 */
 486
 487 #define cop_hints_fetch_pvs(cop, key, flags) \
 488     cophh_fetch_pvs(CopHINTHASH_get(cop), key, flags)
 489
 490 /*
 491 =for apidoc Am|SV *|cop_hints_fetch_pv|const COP *cop|const char *key|U32 hash|U32 flags
 492
 493 Like L</cop_hints_fetch_pvn>, but takes a nul-terminated string instead
 494 of a string/length pair.
 495
 496 =cut
 497 */
 498
 499 #define cop_hints_fetch_pv(cop, key, hash, flags) \
 500     cophh_fetch_pv(CopHINTHASH_get(cop), key, hash, flags)
 501
 502 /*
 503 =for apidoc Am|SV *|cop_hints_fetch_sv|const COP *cop|SV *key|U32 hash|U32 flags
 504
 505 Like L</cop_hints_fetch_pvn>, but takes a Perl scalar instead of a
 506 string/length pair.
 507
 508 =cut
 509 */
 510
 511 #define cop_hints_fetch_sv(cop, key, hash, flags) \
 512     cophh_fetch_sv(CopHINTHASH_get(cop), key, hash, flags)
 513
 514 /*
 515 =for apidoc Am|HV *|cop_hints_2hv|const COP *cop|U32 flags
 516
 517 Generates and returns a standard Perl hash representing the full set of
 518 hint entries in the cop C<cop>.  C<flags> is currently unused and must
 519 be zero.
 520
 521 =cut
 522 */
 523
 524 #define cop_hints_2hv(cop, flags) \
 525     cophh_2hv(CopHINTHASH_get(cop), flags)
 526
 527 #define CopLABEL(c)  Perl_cop_fetch_label(aTHX_ (c), NULL, NULL)
 528 #define CopLABEL_len(c,len)  Perl_cop_fetch_label(aTHX_ (c), len, NULL)
 529 #define CopLABEL_len_flags(c,len,flags)  Perl_cop_fetch_label(aTHX_ (c), len, flags)
 530 #define CopLABEL_alloc(pv)      ((pv)?savepv(pv):NULL)
 531
 532 #define CopSTASH_ne(c,hv)       (!CopSTASH_eq(c,hv))
 533 #define CopLINE(c)              ((c)->cop_line)
 534 #define CopLINE_inc(c)          (++CopLINE(c))
 535 #define CopLINE_dec(c)          (--CopLINE(c))
 536 #define CopLINE_set(c,l)        (CopLINE(c) = (l))
 537
 538 /* OutCopFILE() is CopFILE for output (caller, die, warn, etc.) */
 539 #define OutCopFILE(c) CopFILE(c)
 540
 541 #define CopHINTS_get(c)         ((c)->cop_hints + 0)
 542 #define CopHINTS_set(c, h)      STMT_START {                            \
 543                                     (c)->cop_hints = (h);               \
 544                                 } STMT_END
 545
 546 /*
 547  * Here we have some enormously heavy (or at least ponderous) wizardry.
 548  */
 549
 550 /* subroutine context */
 551 struct block_sub {
 552     OP *        retop;  /* op to execute on exit from sub */
 553     /* Above here is the same for sub, format and eval.  */
 554     PAD         *prevcomppad; /* the caller's PL_comppad */
 555     CV *        cv;
 556     /* Above here is the same for sub and format.  */
 557     I32         olddepth;
 558     AV          *savearray;
 559 };
 560
 561
 562 /* format context */
 563 struct block_format {
 564     OP *        retop;  /* op to execute on exit from sub */
 565     /* Above here is the same for sub, format and eval.  */
 566     PAD         *prevcomppad; /* the caller's PL_comppad */
 567     CV *        cv;
 568     /* Above here is the same for sub and format.  */
 569     GV *        gv;
 570     GV *        dfoutgv;
 571 };
 572
 573 /* free all savestack items back to the watermark of the specified context */
 574
 575 #define CX_LEAVE_SCOPE(cx) LEAVE_SCOPE(cx->blk_oldsaveix)
 576
 577 #ifdef DEBUGGING
 578 /* on debugging builds, poison cx afterwards so we know no code
 579  * uses it - because after doing cxstack_ix--, any ties, exceptions etc
 580  * may overwrite the current stack frame */
 581 #  define CX_POP(cx)                                                   \
 582         assert(&cxstack[cxstack_ix] == cx);                            \
 583         cxstack_ix--;                                                  \
 584         cx = NULL;
 585 #else
 586 #  define CX_POP(cx) cxstack_ix--;
 587 #endif
 588
 589
 590 /* base for the next two macros. Don't use directly.
 591  * The context frame holds a reference to the CV so that it can't be
 592  * freed while we're executing it */
 593
 594 #define PUSHSUB_BASE(cx)                                                \
 595         ENTRY_PROBE(CvNAMED(cv)                                         \
 596                         ? HEK_KEY(CvNAME_HEK(cv))                       \
 597                         : GvENAME(CvGV(cv)),                            \
 598                 CopFILE((const COP *)CvSTART(cv)),                      \
 599                 CopLINE((const COP *)CvSTART(cv)),                      \
 600                 CopSTASHPV((const COP *)CvSTART(cv)));                  \
 601                                                                         \
 602         cx->blk_sub.cv = cv;                                            \
 603         cx->blk_sub.olddepth = CvDEPTH(cv);                             \
 604         cx->blk_sub.prevcomppad = PL_comppad;                           \
 605         cx->cx_type |= (hasargs) ? CXp_HASARGS : 0;                     \
 606         cx->blk_sub.retop = NULL;                                       \
 607         SvREFCNT_inc_simple_void_NN(cv);
 608
 609 #define PUSHSUB_GET_LVALUE_MASK(func) \
 610         /* If the context is indeterminate, then only the lvalue */     \
 611         /* flags that the caller also has are applicable.        */     \
 612         (                                                               \
 613            (PL_op->op_flags & OPf_WANT)                                 \
 614                ? OPpENTERSUB_LVAL_MASK                                  \
 615                : !(PL_op->op_private & OPpENTERSUB_LVAL_MASK)           \
 616                    ? 0 : (U8)func(aTHX)                                 \
 617         )
 618
 619 #define PUSHSUB(cx)                                                     \
 620     {                                                                   \
 621         U8 phlags = PUSHSUB_GET_LVALUE_MASK(Perl_was_lvalue_sub);       \
 622         PUSHSUB_BASE(cx)                                                \
 623         cx->blk_u16 = PL_op->op_private &                               \
 624                           (phlags|OPpDEREF);                            \
 625     }
 626
 627 /* variant for use by OP_DBSTATE, where op_private holds hint bits */
 628 #define PUSHSUB_DB(cx)                                                  \
 629         PUSHSUB_BASE(cx)                                                \
 630         cx->blk_u16 = 0;
 631
 632
 633 #define PUSHFORMAT(cx, retop)                                           \
 634         cx->blk_format.cv = cv;                                         \
 635         cx->blk_format.gv = gv;                                         \
 636         cx->blk_format.retop = (retop);                                 \
 637         cx->blk_format.dfoutgv = PL_defoutgv;                           \
 638         cx->blk_format.prevcomppad = PL_comppad;                        \
 639         cx->blk_u16 = 0;                                                \
 640         cx->blk_oldsaveix = PL_savestack_ix;                            \
 641         SvREFCNT_inc_simple_void_NN(cv);                                \
 642         CvDEPTH(cv)++;                                                  \
 643         SvREFCNT_inc_void(cx->blk_format.dfoutgv)
 644
 645 /* Restore old @_ */
 646 #define POP_SAVEARRAY()                                         \
 647     STMT_START {                                                        \
 648         AV *av = GvAV(PL_defgv);                                        \
 649         GvAV(PL_defgv) = cx->blk_sub.savearray;                         \
 650         cx->blk_sub.savearray = NULL;                                   \
 651         SvREFCNT_dec(av);                                               \
 652     } STMT_END
 653
 654 /* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
 655  * leave any (a fast av_clear(ary), basically) */
 656 #define CLEAR_ARGARRAY(ary) \
 657     STMT_START {                                                        \
 658         AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary);                      \
 659         AvARRAY(ary) = AvALLOC(ary);                                    \
 660         AvFILLp(ary) = -1;                                              \
 661     } STMT_END
 662
 663
 664 /* subsets of POPSUB */
 665
 666 #define POPSUB_COMMON(cx) \
 667     STMT_START {                                                        \
 668         CV *cv;                                                         \
 669         PL_comppad = cx->blk_sub.prevcomppad;                           \
 670         PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;    \
 671         cv = cx->blk_sub.cv;                                            \
 672         CvDEPTH(cv) = cx->blk_sub.olddepth;                             \
 673         cx->blk_sub.cv = NULL;                                          \
 674         SvREFCNT_dec(cv);                                               \
 675     } STMT_END
 676
 677 /* handle the @_ part of leaving a sub */
 678
 679 #define POPSUB_ARGS(cx) \
 680     STMT_START {                                                        \
 681         AV *av;                                                         \
 682         assert(AvARRAY(MUTABLE_AV(                                      \
 683             PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[                    \
 684                     CvDEPTH(cx->blk_sub.cv)])) == PL_curpad);           \
 685         POP_SAVEARRAY();                                                \
 686         /* abandon @_ if it got reified */                              \
 687         av = MUTABLE_AV(PAD_SVl(0));                                    \
 688         if (UNLIKELY(AvREAL(av)))                                       \
 689             clear_defarray(av, 0);                                      \
 690         else {                                                          \
 691             CLEAR_ARGARRAY(av);                                         \
 692         }                                                               \
 693     } STMT_END
 694
 695 #define POPSUB(cx)                                                      \
 696     STMT_START {                                                        \
 697         RETURN_PROBE(CvNAMED(cx->blk_sub.cv)                            \
 698                         ? HEK_KEY(CvNAME_HEK(cx->blk_sub.cv))           \
 699                         : GvENAME(CvGV(cx->blk_sub.cv)),                \
 700                 CopFILE((COP*)CvSTART((const CV*)cx->blk_sub.cv)),      \
 701                 CopLINE((COP*)CvSTART((const CV*)cx->blk_sub.cv)),      \
 702                 CopSTASHPV((COP*)CvSTART((const CV*)cx->blk_sub.cv)));  \
 703                                                                         \
 704         if (CxHASARGS(cx)) {                                            \
 705             POPSUB_ARGS(cx);                                            \
 706         }                                                               \
 707         POPSUB_COMMON(cx);                                              \
 708     } STMT_END
 709
 710 #define POPFORMAT(cx)                                                   \
 711     STMT_START {                                                        \
 712         CV *cv;                                                         \
 713         GV * const dfout = cx->blk_format.dfoutgv;                      \
 714         setdefout(dfout);                                               \
 715         cx->blk_format.dfoutgv = NULL;                                  \
 716         SvREFCNT_dec_NN(dfout); /* the cx->defoutgv ref */              \
 717         PL_comppad = cx->blk_format.prevcomppad;                        \
 718         PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;    \
 719         cv = cx->blk_format.cv;                                         \
 720         cx->blk_format.cv = NULL;;                                      \
 721         --CvDEPTH(cv);                                                  \
 722         SvREFCNT_dec_NN(cv);                                            \
 723     } STMT_END
 724
 725 /* eval context */
 726 struct block_eval {
 727     OP *        retop;  /* op to execute on exit from eval */
 728     /* Above here is the same for sub, format and eval.  */
 729     SV *        old_namesv;
 730     OP *        old_eval_root;
 731     SV *        cur_text;
 732     CV *        cv;
 733     JMPENV *    cur_top_env; /* value of PL_top_env when eval CX created */
 734 };
 735
 736 /* If we ever need more than 512 op types, change the shift from 7.
 737    blku_gimme is actually also only 2 bits, so could be merged with something.
 738 */
 739
 740 #define CxOLD_IN_EVAL(cx)       (((cx)->blk_u16) & 0x7F)
 741 #define CxOLD_OP_TYPE(cx)       (((cx)->blk_u16) >> 7)
 742
 743 #define PUSHEVAL(cx,n)                                                  \
 744     STMT_START {                                                        \
 745         assert(!(PL_in_eval & ~0x7F));                                  \
 746         assert(!(PL_op->op_type & ~0x1FF));                             \
 747         cx->blk_u16 = (PL_in_eval & 0x7F) | ((U16)PL_op->op_type << 7); \
 748         cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL);            \
 749         cx->blk_eval.old_eval_root = PL_eval_root;                      \
 750         cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL;  \
 751         cx->blk_eval.cv = NULL; /* set by doeval_compile() as applicable */ \
 752         cx->blk_eval.retop = NULL;                                      \
 753         cx->blk_eval.cur_top_env = PL_top_env;                          \
 754     } STMT_END
 755
 756 #define POPEVAL(cx)                                                     \
 757     STMT_START {                                                        \
 758         SV *sv;                                                         \
 759         PL_in_eval = CxOLD_IN_EVAL(cx);                                 \
 760         PL_eval_root = cx->blk_eval.old_eval_root;                      \
 761         sv = cx->blk_eval.cur_text;                                     \
 762         if (sv && SvSCREAM(sv)) {                                       \
 763             cx->blk_eval.cur_text = NULL;                               \
 764             SvREFCNT_dec_NN(sv);                                        \
 765         }                                                               \
 766         sv = cx->blk_eval.old_namesv;                                   \
 767         if (sv && !SvTEMP(sv))/* TEMP => POPEVAL re-entrantly called */ \
 768             sv_2mortal(sv);                                             \
 769     } STMT_END
 770
 771 /* loop context */
 772 struct block_loop {
 773     LOOP *      my_op;  /* My op, that contains redo, next and last ops.  */
 774     union {     /* different ways of locating the iteration variable */
 775         SV      **svp; /* for lexicals: address of pad slot */
 776         GV      *gv;   /* for package vars */
 777     } itervar_u;
 778     SV          *itersave; /* the original iteration var */
 779     union {
 780         struct { /* CXt_LOOP_ARY, C<for (@ary)>  */
 781             AV *ary; /* array being iterated over */
 782             IV  ix;   /* index relative to base of array */
 783         } ary;
 784         struct { /* CXt_LOOP_LIST, C<for (list)> */
 785             I32 basesp; /* first element of list on stack */
 786             IV  ix;      /* index relative to basesp */
 787         } stack;
 788         struct { /* CXt_LOOP_LAZYIV, C<for (1..9)> */
 789             IV cur;
 790             IV end;
 791         } lazyiv;
 792         struct { /* CXt_LOOP_LAZYSV C<for ('a'..'z')> */
 793             SV * cur;
 794             SV * end; /* maxiumum value (or minimum in reverse) */
 795         } lazysv;
 796     } state_u;
 797 #ifdef USE_ITHREADS
 798     PAD *oldcomppad; /* needed to map itervar_u.svp during thread clone */
 799 #endif
 800 };
 801
 802 #define CxITERVAR(c)                                    \
 803         (CxPADLOOP(c)                                   \
 804             ? (c)->blk_loop.itervar_u.svp               \
 805             : ((c)->cx_type & CXp_FOR_GV)               \
 806                 ? &GvSV((c)->blk_loop.itervar_u.gv)     \
 807                 : (SV **)&(c)->blk_loop.itervar_u.gv)
 808
 809 #define CxLABEL(c)      (0 + CopLABEL((c)->blk_oldcop))
 810 #define CxLABEL_len(c,len)      (0 + CopLABEL_len((c)->blk_oldcop, len))
 811 #define CxLABEL_len_flags(c,len,flags)  (0 + CopLABEL_len_flags((c)->blk_oldcop, len, flags))
 812 #define CxHASARGS(c)    (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
 813 #define CxLVAL(c)       (0 + ((c)->blk_u16 & 0xff))
 814
 815
 816 #define PUSHLOOP_PLAIN(cx)                                              \
 817         cx->blk_loop.my_op = cLOOP;                                     \
 818         cx->blk_oldsaveix = PL_savestack_ix;
 819
 820 #ifdef USE_ITHREADS
 821 #  define PUSHLOOP_FOR_setpad(c) (c)->blk_loop.oldcomppad = PL_comppad
 822 #else
 823 #  define PUSHLOOP_FOR_setpad(c) NOOP
 824 #endif
 825
 826 #define PUSHLOOP_FOR(cx, ivar, isave)                                   \
 827         cx->blk_loop.my_op = cLOOP;                                     \
 828         cx->blk_loop.itervar_u.svp = (SV**)(ivar);                      \
 829         cx->blk_oldsaveix = PL_savestack_ix;                                \
 830         cx->blk_loop.itersave = isave;                                  \
 831         PUSHLOOP_FOR_setpad(cx);
 832
 833 #define POPLOOP(cx)                                                     \
 834         if (CxTYPE(cx) == CXt_LOOP_LAZYSV) {                            \
 835             SvREFCNT_dec_NN(cx->blk_loop.state_u.lazysv.cur);           \
 836             SvREFCNT_dec_NN(cx->blk_loop.state_u.lazysv.end);           \
 837         }                                                               \
 838         else if (CxTYPE(cx) == CXt_LOOP_ARY)                            \
 839             SvREFCNT_dec(cx->blk_loop.state_u.ary.ary);                 \
 840         if (cx->cx_type & (CXp_FOR_PAD|CXp_FOR_GV)) {                   \
 841             SV *cursv;                                                  \
 842             SV **svp = (cx)->blk_loop.itervar_u.svp;                    \
 843             if ((cx->cx_type & CXp_FOR_GV))                             \
 844                 svp = &GvSV((GV*)svp);                                  \
 845             cursv = *svp;                                               \
 846             *svp = cx->blk_loop.itersave;                               \
 847             SvREFCNT_dec(cursv);                                        \
 848         }
 849
 850 /* given/when context */
 851 struct block_givwhen {
 852         OP *leave_op;
 853         SV *defsv_save; /* the original $_ */
 854 };
 855
 856 #define PUSHWHEN(cx)                                                    \
 857         cx->blk_oldsaveix = PL_savestack_ix;                            \
 858         cx->blk_givwhen.leave_op = cLOGOP->op_other;
 859
 860 #define PUSHGIVEN(cx, orig_var)                                         \
 861         PUSHWHEN(cx);                                                   \
 862         cx->blk_givwhen.defsv_save = orig_var;
 863
 864 #define POPWHEN(cx)                                                     \
 865         NOOP;
 866
 867 #define POPGIVEN(cx)                                                    \
 868         SvREFCNT_dec(GvSV(PL_defgv));                                   \
 869         GvSV(PL_defgv) = cx->blk_givwhen.defsv_save;
 870
 871
 872 /* basic block, i.e. pp_enter/leave */
 873
 874 #define PUSHBASICBLK(cx)                                                \
 875         cx->blk_oldsaveix = PL_savestack_ix;
 876
 877 #define POPBASICBLK(cx)                                                 \
 878         NOOP;
 879
 880
 881 /* context common to subroutines, evals and loops */
 882 struct block {
 883     U8          blku_type;      /* what kind of context this is */
 884     U8          blku_gimme;     /* is this block running in list context? */
 885     U16         blku_u16;       /* used by block_sub and block_eval (so far) */
 886     I32         blku_oldsaveix; /* saved PL_savestack_ix */
 887     /* all the fields above must be aligned with same-sized fields as sbu */
 888     I32         blku_oldsp;     /* current sp floor: where nextstate pops to */
 889     I32         blku_oldmarksp; /* mark stack index */
 890     COP *       blku_oldcop;    /* old curcop pointer */
 891     PMOP *      blku_oldpm;     /* values of pattern match vars */
 892     SSize_t     blku_old_tmpsfloor;     /* saved PL_tmps_floor */
 893     I32         blku_oldscopesp;        /* scope stack index */
 894
 895     union {
 896         struct block_sub        blku_sub;
 897         struct block_format     blku_format;
 898         struct block_eval       blku_eval;
 899         struct block_loop       blku_loop;
 900         struct block_givwhen    blku_givwhen;
 901     } blk_u;
 902 };
 903 #define blk_oldsp       cx_u.cx_blk.blku_oldsp
 904 #define blk_oldcop      cx_u.cx_blk.blku_oldcop
 905 #define blk_oldmarksp   cx_u.cx_blk.blku_oldmarksp
 906 #define blk_oldscopesp  cx_u.cx_blk.blku_oldscopesp
 907 #define blk_oldpm       cx_u.cx_blk.blku_oldpm
 908 #define blk_gimme       cx_u.cx_blk.blku_gimme
 909 #define blk_u16         cx_u.cx_blk.blku_u16
 910 #define blk_oldsaveix   cx_u.cx_blk.blku_oldsaveix
 911 #define blk_sub         cx_u.cx_blk.blk_u.blku_sub
 912 #define blk_format      cx_u.cx_blk.blk_u.blku_format
 913 #define blk_eval        cx_u.cx_blk.blk_u.blku_eval
 914 #define blk_loop        cx_u.cx_blk.blk_u.blku_loop
 915 #define blk_givwhen     cx_u.cx_blk.blk_u.blku_givwhen
 916
 917 #define DEBUG_CX(action)                                                \
 918     DEBUG_l(                                                            \
 919         Perl_deb(aTHX_ "CX %ld %s %s (scope %ld,%ld) (save %ld,%ld) at %s:%d\n",\
 920                     (long)cxstack_ix,                                   \
 921                     action,                                             \
 922                     PL_block_type[CxTYPE(&cxstack[cxstack_ix])],        \
 923                     (long)PL_scopestack_ix,                             \
 924                     (long)(cxstack[cxstack_ix].blk_oldscopesp),         \
 925                     (long)PL_savestack_ix,                              \
 926                     (long)(cxstack[cxstack_ix].blk_oldsaveix),          \
 927                     __FILE__, __LINE__));
 928
 929 /* Enter a block. */
 930 #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix],            \
 931         cx->cx_type             = t,                                    \
 932         cx->blk_oldsp           = sp - PL_stack_base,                   \
 933         cx->blk_oldcop          = PL_curcop,                            \
 934         cx->blk_oldmarksp       = PL_markstack_ptr - PL_markstack,      \
 935         cx->blk_oldscopesp      = PL_scopestack_ix,                     \
 936         cx->blk_oldpm           = PL_curpm,                             \
 937         cx->blk_gimme           = (U8)gimme;                            \
 938         cx->cx_u.cx_blk.blku_old_tmpsfloor = PL_tmps_floor;             \
 939         PL_tmps_floor           = PL_tmps_ix;                           \
 940         DEBUG_CX("PUSH");
 941
 942 /* Exit a block (RETURN and LAST). */
 943 #define POPBLOCK(cx)                                                    \
 944         DEBUG_CX("POP");                                                \
 945         PL_curcop        = cx->blk_oldcop,                              \
 946         PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
 947         PL_scopestack_ix = cx->blk_oldscopesp,                          \
 948         /* LEAVE_SCOPE() should have made this true. /(?{})/ cheats
 949          * and leaves a CX entry lying around for repeated use, so
 950          * skip for multicall */                  \
 951         assert(   (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx))            \
 952                 || PL_savestack_ix == cx->blk_oldsaveix);               \
 953         PL_tmps_floor = cx->cx_u.cx_blk.blku_old_tmpsfloor;             \
 954         PL_curpm         = cx->blk_oldpm;
 955
 956 /* Continue a block elsewhere (NEXT and REDO). */
 957 #define TOPBLOCK(cx)                                                    \
 958         DEBUG_CX("TOP");                                                \
 959         cx  = &cxstack[cxstack_ix],                                     \
 960         PL_stack_sp      = PL_stack_base + cx->blk_oldsp,               \
 961         PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
 962         PL_scopestack_ix = cx->blk_oldscopesp,                          \
 963         PL_curpm         = cx->blk_oldpm;
 964
 965 /* substitution context */
 966 struct subst {
 967     U8          sbu_type;       /* same as blku_type */
 968     U8          sbu_rflags;
 969     U16         sbu_rxtainted;
 970     I32         sbu_oldsaveix; /* same as blku_oldsaveix */
 971     /* all the fields above must be aligned with same-sized fields as blku * */
 972     SSize_t     sbu_iters;
 973     SSize_t     sbu_maxiters;
 974     char *      sbu_orig;
 975     SV *        sbu_dstr;
 976     SV *        sbu_targ;
 977     char *      sbu_s;
 978     char *      sbu_m;
 979     char *      sbu_strend;
 980     void *      sbu_rxres;
 981     REGEXP *    sbu_rx;
 982 };
 983 #define sb_iters        cx_u.cx_subst.sbu_iters
 984 #define sb_maxiters     cx_u.cx_subst.sbu_maxiters
 985 #define sb_rflags       cx_u.cx_subst.sbu_rflags
 986 #define sb_rxtainted    cx_u.cx_subst.sbu_rxtainted
 987 #define sb_orig         cx_u.cx_subst.sbu_orig
 988 #define sb_dstr         cx_u.cx_subst.sbu_dstr
 989 #define sb_targ         cx_u.cx_subst.sbu_targ
 990 #define sb_s            cx_u.cx_subst.sbu_s
 991 #define sb_m            cx_u.cx_subst.sbu_m
 992 #define sb_strend       cx_u.cx_subst.sbu_strend
 993 #define sb_rxres        cx_u.cx_subst.sbu_rxres
 994 #define sb_rx           cx_u.cx_subst.sbu_rx
 995
 996 #ifdef PERL_CORE
 997 #  define PUSHSUBST(cx) CXINC, cx = &cxstack[cxstack_ix],               \
 998         cx->blk_oldsaveix = oldsave,                                    \
 999         cx->sb_iters            = iters,                                \
1000         cx->sb_maxiters         = maxiters,                             \
1001         cx->sb_rflags           = r_flags,                              \
1002         cx->sb_rxtainted        = rxtainted,                            \
1003         cx->sb_orig             = orig,                                 \
1004         cx->sb_dstr             = dstr,                                 \
1005         cx->sb_targ             = targ,                                 \
1006         cx->sb_s                = s,                                    \
1007         cx->sb_m                = m,                                    \
1008         cx->sb_strend           = strend,                               \
1009         cx->sb_rxres            = NULL,                                 \
1010         cx->sb_rx               = rx,                                   \
1011         cx->cx_type             = CXt_SUBST | (once ? CXp_ONCE : 0);    \
1012         rxres_save(&cx->sb_rxres, rx);                                  \
1013         (void)ReREFCNT_inc(rx);                                         \
1014         SvREFCNT_inc_void_NN(targ)
1015
1016 #  define POPSUBST(cx) \
1017         rxres_free(&cx->sb_rxres);                                      \
1018         ReREFCNT_dec(cx->sb_rx);                                        \
1019         SvREFCNT_dec_NN(cx->sb_targ)
1020 #endif
1021
1022 #define CxONCE(cx)              ((cx)->cx_type & CXp_ONCE)
1023
1024 struct context {
1025     union {
1026         struct block    cx_blk;
1027         struct subst    cx_subst;
1028     } cx_u;
1029 };
1030 #define cx_type cx_u.cx_subst.sbu_type
1031
1032 /* If you re-order these, there is also an array of uppercase names in perl.h
1033    and a static array of context names in pp_ctl.c  */
1034 #define CXTYPEMASK      0xf
1035 #define CXt_NULL        0 /* currently only used for sort BLOCK */
1036 #define CXt_WHEN        1
1037 #define CXt_BLOCK       2
1038 /* When micro-optimising :-) keep GIVEN next to the LOOPs, as these 5 share a
1039    jump table in pp_ctl.c
1040    The first 4 don't have a 'case' in at least one switch statement in pp_ctl.c
1041 */
1042 #define CXt_GIVEN       3
1043
1044 /* be careful of the ordering of these five. Macros like CxTYPE_is_LOOP,
1045  * CxFOREACH compare ranges */
1046 #define CXt_LOOP_PLAIN  4 /*                {} */
1047 #define CXt_LOOP_LAZYIV 5 /* for (1..9)     {} */
1048 #define CXt_LOOP_LAZYSV 6 /* for ('a'..'z') {} */
1049 #define CXt_LOOP_LIST   7 /* for (1,2,3)    {} */
1050 #define CXt_LOOP_ARY    8 /* for (@ary)     {} */
1051
1052 #define CXt_SUB         9
1053 #define CXt_FORMAT     10
1054 #define CXt_EVAL       11
1055 #define CXt_SUBST      12
1056 /* SUBST doesn't feature in all switch statements.  */
1057
1058 /* private flags for CXt_SUB and CXt_FORMAT */
1059 #define CXp_MULTICALL   0x10    /* part of a multicall (so don't tear down
1060                                    context on exit). (not CXt_FORMAT) */
1061 #define CXp_HASARGS     0x20
1062 #define CXp_SUB_RE      0x40    /* code called within regex, i.e. (?{}) */
1063 #define CXp_SUB_RE_FAKE 0x80    /* fake sub CX for (?{}) in current scope */
1064
1065 /* private flags for CXt_EVAL */
1066 #define CXp_REAL        0x20    /* truly eval'', not a lookalike */
1067 #define CXp_TRYBLOCK    0x40    /* eval{}, not eval'' or similar */
1068
1069 /* private flags for CXt_LOOP */
1070 #define CXp_FOR_DEF     0x10    /* foreach using $_ */
1071 #define CXp_FOR_LVREF   0x20    /* foreach using \$var */
1072 #define CXp_FOR_GV      0x40    /* foreach using package var */
1073 #define CXp_FOR_PAD     0x80    /* foreach using lexical var */
1074 #define CxPADLOOP(c)    ((c)->cx_type & CXp_FOR_PAD)
1075
1076 /* private flags for CXt_SUBST */
1077 #define CXp_ONCE        0x10    /* What was sbu_once in struct subst */
1078
1079 #define CxTYPE(c)       ((c)->cx_type & CXTYPEMASK)
1080 #define CxTYPE_is_LOOP(c) (   CxTYPE(cx) >= CXt_LOOP_PLAIN              \
1081                            && CxTYPE(cx) <= CXt_LOOP_ARY)
1082 #define CxMULTICALL(c)  ((c)->cx_type & CXp_MULTICALL)
1083 #define CxREALEVAL(c)   (((c)->cx_type & (CXTYPEMASK|CXp_REAL))         \
1084                          == (CXt_EVAL|CXp_REAL))
1085 #define CxTRYBLOCK(c)   (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK))     \
1086                          == (CXt_EVAL|CXp_TRYBLOCK))
1087 #define CxFOREACH(c)    (   CxTYPE(cx) >= CXt_LOOP_LAZYSV               \
1088                          && CxTYPE(cx) <= CXt_LOOP_ARY)
1089
1090 #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
1091
1092 /*
1093 =head1 "Gimme" Values
1094 */
1095
1096 /*
1097 =for apidoc AmU||G_SCALAR
1098 Used to indicate scalar context.  See C<L</GIMME_V>>, C<L</GIMME>>, and
1099 L<perlcall>.
1100
1101 =for apidoc AmU||G_ARRAY
1102 Used to indicate list context.  See C<L</GIMME_V>>, C<L</GIMME>> and
1103 L<perlcall>.
1104
1105 =for apidoc AmU||G_VOID
1106 Used to indicate void context.  See C<L</GIMME_V>> and L<perlcall>.
1107
1108 =for apidoc AmU||G_DISCARD
1109 Indicates that arguments returned from a callback should be discarded.  See
1110 L<perlcall>.
1111
1112 =for apidoc AmU||G_EVAL
1113
1114 Used to force a Perl C<eval> wrapper around a callback.  See
1115 L<perlcall>.
1116
1117 =for apidoc AmU||G_NOARGS
1118
1119 Indicates that no arguments are being sent to a callback.  See
1120 L<perlcall>.
1121
1122 =cut
1123 */
1124
1125 #define G_SCALAR        2
1126 #define G_ARRAY         3
1127 #define G_VOID          1
1128 #define G_WANT          3
1129
1130 /* extra flags for Perl_call_* routines */
1131 #define G_DISCARD       4       /* Call FREETMPS.
1132                                    Don't change this without consulting the
1133                                    hash actions codes defined in hv.h */
1134 #define G_EVAL          8       /* Assume eval {} around subroutine call. */
1135 #define G_NOARGS       16       /* Don't construct a @_ array. */
1136 #define G_KEEPERR      32       /* Warn for errors, don't overwrite $@ */
1137 #define G_NODEBUG      64       /* Disable debugging at toplevel.  */
1138 #define G_METHOD      128       /* Calling method. */
1139 #define G_FAKINGEVAL  256       /* Faking an eval context for call_sv or
1140                                    fold_constants. */
1141 #define G_UNDEF_FILL  512       /* Fill the stack with &PL_sv_undef
1142                                    A special case for UNSHIFT in
1143                                    Perl_magic_methcall().  */
1144 #define G_WRITING_TO_STDERR 1024 /* Perl_write_to_stderr() is calling
1145                                     Perl_magic_methcall().  */
1146 #define G_RE_REPARSING 0x800     /* compiling a run-time /(?{..})/ */
1147 #define G_METHOD_NAMED 4096     /* calling named method, eg without :: or ' */
1148
1149 /* flag bits for PL_in_eval */
1150 #define EVAL_NULL       0       /* not in an eval */
1151 #define EVAL_INEVAL     1       /* some enclosing scope is an eval */
1152 #define EVAL_WARNONLY   2       /* used by yywarn() when calling yyerror() */
1153 #define EVAL_KEEPERR    4       /* set by Perl_call_sv if G_KEEPERR */
1154 #define EVAL_INREQUIRE  8       /* The code is being required. */
1155 #define EVAL_RE_REPARSING 0x10  /* eval_sv() called with G_RE_REPARSING */
1156
1157 /* Support for switching (stack and block) contexts.
1158  * This ensures magic doesn't invalidate local stack and cx pointers.
1159  */
1160
1161 #define PERLSI_UNKNOWN          -1
1162 #define PERLSI_UNDEF            0
1163 #define PERLSI_MAIN             1
1164 #define PERLSI_MAGIC            2
1165 #define PERLSI_SORT             3
1166 #define PERLSI_SIGNAL           4
1167 #define PERLSI_OVERLOAD         5
1168 #define PERLSI_DESTROY          6
1169 #define PERLSI_WARNHOOK         7
1170 #define PERLSI_DIEHOOK          8
1171 #define PERLSI_REQUIRE          9
1172 #define PERLSI_MULTICALL       10
1173
1174 struct stackinfo {
1175     AV *                si_stack;       /* stack for current runlevel */
1176     PERL_CONTEXT *      si_cxstack;     /* context stack for runlevel */
1177     struct stackinfo *  si_prev;
1178     struct stackinfo *  si_next;
1179     I32                 si_cxix;        /* current context index */
1180     I32                 si_cxmax;       /* maximum allocated index */
1181     I32                 si_type;        /* type of runlevel */
1182     I32                 si_markoff;     /* offset where markstack begins for us.
1183                                          * currently used only with DEBUGGING,
1184                                          * but not #ifdef-ed for bincompat */
1185 };
1186
1187 typedef struct stackinfo PERL_SI;
1188
1189 #define cxstack         (PL_curstackinfo->si_cxstack)
1190 #define cxstack_ix      (PL_curstackinfo->si_cxix)
1191 #define cxstack_max     (PL_curstackinfo->si_cxmax)
1192
1193 #ifdef DEBUGGING
1194 #  define       SET_MARK_OFFSET \
1195     PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
1196 #else
1197 #  define       SET_MARK_OFFSET NOOP
1198 #endif
1199
1200 #define PUSHSTACKi(type) \
1201     STMT_START {                                                        \
1202         PERL_SI *next = PL_curstackinfo->si_next;                       \
1203         DEBUG_l({                                                       \
1204             int i = 0; PERL_SI *p = PL_curstackinfo;                    \
1205             while (p) { i++; p = p->si_prev; }                          \
1206             Perl_deb(aTHX_ "push STACKINFO %d at %s:%d\n",              \
1207                          i, __FILE__, __LINE__);})                      \
1208         if (!next) {                                                    \
1209             next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1);    \
1210             next->si_prev = PL_curstackinfo;                            \
1211             PL_curstackinfo->si_next = next;                            \
1212         }                                                               \
1213         next->si_type = type;                                           \
1214         next->si_cxix = -1;                                             \
1215         AvFILLp(next->si_stack) = 0;                                    \
1216         SWITCHSTACK(PL_curstack,next->si_stack);                        \
1217         PL_curstackinfo = next;                                         \
1218         SET_MARK_OFFSET;                                                \
1219     } STMT_END
1220
1221 #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
1222
1223 /* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
1224  * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
1225 #define POPSTACK \
1226     STMT_START {                                                        \
1227         dSP;                                                            \
1228         PERL_SI * const prev = PL_curstackinfo->si_prev;                \
1229         DEBUG_l({                                                       \
1230             int i = -1; PERL_SI *p = PL_curstackinfo;                   \
1231             while (p) { i++; p = p->si_prev; }                          \
1232             Perl_deb(aTHX_ "pop  STACKINFO %d at %s:%d\n",              \
1233                          i, __FILE__, __LINE__);})                      \
1234         if (!prev) {                                                    \
1235             Perl_croak_popstack();                                      \
1236         }                                                               \
1237         SWITCHSTACK(PL_curstack,prev->si_stack);                        \
1238         /* don't free prev here, free them all at the END{} */          \
1239         PL_curstackinfo = prev;                                         \
1240     } STMT_END
1241
1242 #define POPSTACK_TO(s) \
1243     STMT_START {                                                        \
1244         while (PL_curstack != s) {                                      \
1245             dounwind(-1);                                               \
1246             POPSTACK;                                                   \
1247         }                                                               \
1248     } STMT_END
1249
1250 #define IN_PERL_COMPILETIME     (PL_curcop == &PL_compiling)
1251 #define IN_PERL_RUNTIME         (PL_curcop != &PL_compiling)
1252
1253 /*
1254 =head1 Multicall Functions
1255
1256 =for apidoc Ams||dMULTICALL
1257 Declare local variables for a multicall.  See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1258
1259 =for apidoc Ams||PUSH_MULTICALL
1260 Opening bracket for a lightweight callback.
1261 See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1262
1263 =for apidoc Ams||MULTICALL
1264 Make a lightweight callback.  See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1265
1266 =for apidoc Ams||POP_MULTICALL
1267 Closing bracket for a lightweight callback.
1268 See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1269
1270 =cut
1271 */
1272
1273 #define dMULTICALL \
1274     SV **newsp;                 /* set by POPBLOCK */                   \
1275     PERL_CONTEXT *cx;                                                   \
1276     CV *multicall_cv;                                                   \
1277     OP *multicall_cop;                                                  \
1278     bool multicall_oldcatch;                                            \
1279     U8 hasargs = 0              /* used by PUSHSUB */
1280
1281 #define PUSH_MULTICALL(the_cv) \
1282     PUSH_MULTICALL_FLAGS(the_cv, 0)
1283
1284 /* Like PUSH_MULTICALL, but allows you to specify extra flags
1285  * for the CX stack entry (this isn't part of the public API) */
1286
1287 #define PUSH_MULTICALL_FLAGS(the_cv, flags) \
1288     STMT_START {                                                        \
1289         CV * const _nOnclAshIngNamE_ = the_cv;                          \
1290         CV * const cv = _nOnclAshIngNamE_;                              \
1291         PADLIST * const padlist = CvPADLIST(cv);                        \
1292         multicall_oldcatch = CATCH_GET;                                 \
1293         CATCH_SET(TRUE);                                                \
1294         PUSHSTACKi(PERLSI_MULTICALL);                                   \
1295         PUSHBLOCK(cx, (CXt_SUB|CXp_MULTICALL|flags), PL_stack_sp);      \
1296         PUSHSUB(cx);                                                    \
1297         cx->blk_oldsaveix = PL_savestack_ix;                            \
1298         SAVEVPTR(PL_op);                                                \
1299         if (!(flags & CXp_SUB_RE_FAKE))                                 \
1300             CvDEPTH(cv)++;                                              \
1301         if (CvDEPTH(cv) >= 2) {                                         \
1302             PERL_STACK_OVERFLOW_CHECK();                                \
1303             Perl_pad_push(aTHX_ padlist, CvDEPTH(cv));                  \
1304         }                                                               \
1305         PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));                       \
1306         multicall_cv = cv;                                              \
1307         PERL_UNUSED_VAR(multicall_cv); /* for API */                    \
1308         multicall_cop = CvSTART(cv);                                    \
1309     } STMT_END
1310
1311 #define MULTICALL \
1312     STMT_START {                                                        \
1313         PL_op = multicall_cop;                                          \
1314         CALLRUNOPS(aTHX);                                               \
1315     } STMT_END
1316
1317 #define POP_MULTICALL \
1318     STMT_START {                                                        \
1319         cx = &cxstack[cxstack_ix];                                      \
1320         CX_LEAVE_SCOPE(cx);                                             \
1321         POPSUB_COMMON(cx);                                              \
1322         newsp = PL_stack_base + cx->blk_oldsp;                          \
1323         gimme = cx->blk_gimme;                                          \
1324         PERL_UNUSED_VAR(newsp); /* for API */                           \
1325         PERL_UNUSED_VAR(gimme); /* for API */                           \
1326         POPBLOCK(cx);                                                   \
1327         CX_POP(cx);                                                     \
1328         POPSTACK;                                                       \
1329         CATCH_SET(multicall_oldcatch);                                  \
1330         SPAGAIN;                                                        \
1331     } STMT_END
1332
1333 /* Change the CV of an already-pushed MULTICALL CxSUB block.
1334  * (this isn't part of the public API) */
1335
1336 #define CHANGE_MULTICALL_FLAGS(the_cv, flags) \
1337     STMT_START {                                                        \
1338         CV * const _nOnclAshIngNamE_ = the_cv;                          \
1339         CV * const cv = _nOnclAshIngNamE_;                              \
1340         PADLIST * const padlist = CvPADLIST(cv);                        \
1341         cx = &cxstack[cxstack_ix];                                      \
1342         assert(CxMULTICALL(cx));                                        \
1343         POPSUB_COMMON(cx);                                              \
1344         cx->cx_type = (CXt_SUB|CXp_MULTICALL|flags);                    \
1345         PUSHSUB(cx);                                                    \
1346         if (!(flags & CXp_SUB_RE_FAKE))                                 \
1347             CvDEPTH(cv)++;                                              \
1348         if (CvDEPTH(cv) >= 2) {                                         \
1349             PERL_STACK_OVERFLOW_CHECK();                                \
1350             Perl_pad_push(aTHX_ padlist, CvDEPTH(cv));                  \
1351         }                                                               \
1352         PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));                       \
1353         multicall_cv = cv;                                              \
1354         multicall_cop = CvSTART(cv);                                    \
1355     } STMT_END
1356 /*
1357  * ex: set ts=8 sts=4 sw=4 et:
1358  */