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 /* return a pointer to the current context */
 574
 575 #define CX_CUR() (&cxstack[cxstack_ix])
 576
 577 /* free all savestack items back to the watermark of the specified context */
 578
 579 #define CX_LEAVE_SCOPE(cx) LEAVE_SCOPE(cx->blk_oldsaveix)
 580
 581 #ifdef DEBUGGING
 582 /* on debugging builds, poison cx afterwards so we know no code
 583  * uses it - because after doing cxstack_ix--, any ties, exceptions etc
 584  * may overwrite the current stack frame */
 585 #  define CX_POP(cx)                                                   \
 586         assert(CX_CUR() == cx);                                        \
 587         cxstack_ix--;                                                  \
 588         cx = NULL;
 589 #else
 590 #  define CX_POP(cx) cxstack_ix--;
 591 #endif
 592
 593
 594 /* base for the next two macros. Don't use directly.
 595  * The context frame holds a reference to the CV so that it can't be
 596  * freed while we're executing it */
 597
 598 #define PUSHSUB_BASE(cx)                                                \
 599         ENTRY_PROBE(CvNAMED(cv)                                         \
 600                         ? HEK_KEY(CvNAME_HEK(cv))                       \
 601                         : GvENAME(CvGV(cv)),                            \
 602                 CopFILE((const COP *)CvSTART(cv)),                      \
 603                 CopLINE((const COP *)CvSTART(cv)),                      \
 604                 CopSTASHPV((const COP *)CvSTART(cv)));                  \
 605                                                                         \
 606         cx->blk_sub.cv = cv;                                            \
 607         cx->blk_sub.olddepth = CvDEPTH(cv);                             \
 608         cx->blk_sub.prevcomppad = PL_comppad;                           \
 609         cx->cx_type |= (hasargs) ? CXp_HASARGS : 0;                     \
 610         cx->blk_sub.retop = NULL;                                       \
 611         SvREFCNT_inc_simple_void_NN(cv);
 612
 613 #define PUSHSUB_GET_LVALUE_MASK(func) \
 614         /* If the context is indeterminate, then only the lvalue */     \
 615         /* flags that the caller also has are applicable.        */     \
 616         (                                                               \
 617            (PL_op->op_flags & OPf_WANT)                                 \
 618                ? OPpENTERSUB_LVAL_MASK                                  \
 619                : !(PL_op->op_private & OPpENTERSUB_LVAL_MASK)           \
 620                    ? 0 : (U8)func(aTHX)                                 \
 621         )
 622
 623 #define PUSHSUB(cx)                                                     \
 624     {                                                                   \
 625         U8 phlags = PUSHSUB_GET_LVALUE_MASK(Perl_was_lvalue_sub);       \
 626         PUSHSUB_BASE(cx)                                                \
 627         cx->blk_u16 = PL_op->op_private &                               \
 628                           (phlags|OPpDEREF);                            \
 629     }
 630
 631 /* variant for use by OP_DBSTATE, where op_private holds hint bits */
 632 #define PUSHSUB_DB(cx)                                                  \
 633         PUSHSUB_BASE(cx)                                                \
 634         cx->blk_u16 = 0;
 635
 636
 637 #define PUSHFORMAT(cx, retop)                                           \
 638         cx->blk_format.cv = cv;                                         \
 639         cx->blk_format.gv = gv;                                         \
 640         cx->blk_format.retop = (retop);                                 \
 641         cx->blk_format.dfoutgv = PL_defoutgv;                           \
 642         cx->blk_format.prevcomppad = PL_comppad;                        \
 643         cx->blk_u16 = 0;                                                \
 644         cx->blk_oldsaveix = PL_savestack_ix;                            \
 645         SvREFCNT_inc_simple_void_NN(cv);                                \
 646         CvDEPTH(cv)++;                                                  \
 647         SvREFCNT_inc_void(cx->blk_format.dfoutgv)
 648
 649 /* Restore old @_ */
 650 #define POP_SAVEARRAY()                                         \
 651     STMT_START {                                                        \
 652         AV *av = GvAV(PL_defgv);                                        \
 653         GvAV(PL_defgv) = cx->blk_sub.savearray;                         \
 654         cx->blk_sub.savearray = NULL;                                   \
 655         SvREFCNT_dec(av);                                               \
 656     } STMT_END
 657
 658 /* junk in @_ spells trouble when cloning CVs and in pp_caller(), so don't
 659  * leave any (a fast av_clear(ary), basically) */
 660 #define CLEAR_ARGARRAY(ary) \
 661     STMT_START {                                                        \
 662         AvMAX(ary) += AvARRAY(ary) - AvALLOC(ary);                      \
 663         AvARRAY(ary) = AvALLOC(ary);                                    \
 664         AvFILLp(ary) = -1;                                              \
 665     } STMT_END
 666
 667
 668 /* subsets of POPSUB */
 669
 670 #define POPSUB_COMMON(cx) \
 671     STMT_START {                                                        \
 672         CV *cv;                                                         \
 673         PL_comppad = cx->blk_sub.prevcomppad;                           \
 674         PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;    \
 675         cv = cx->blk_sub.cv;                                            \
 676         CvDEPTH(cv) = cx->blk_sub.olddepth;                             \
 677         cx->blk_sub.cv = NULL;                                          \
 678         SvREFCNT_dec(cv);                                               \
 679     } STMT_END
 680
 681 /* handle the @_ part of leaving a sub */
 682
 683 #define POPSUB_ARGS(cx) \
 684     STMT_START {                                                        \
 685         AV *av;                                                         \
 686         assert(AvARRAY(MUTABLE_AV(                                      \
 687             PadlistARRAY(CvPADLIST(cx->blk_sub.cv))[                    \
 688                     CvDEPTH(cx->blk_sub.cv)])) == PL_curpad);           \
 689         POP_SAVEARRAY();                                                \
 690         /* abandon @_ if it got reified */                              \
 691         av = MUTABLE_AV(PAD_SVl(0));                                    \
 692         if (UNLIKELY(AvREAL(av)))                                       \
 693             clear_defarray(av, 0);                                      \
 694         else {                                                          \
 695             CLEAR_ARGARRAY(av);                                         \
 696         }                                                               \
 697     } STMT_END
 698
 699 #define POPSUB(cx)                                                      \
 700     STMT_START {                                                        \
 701         RETURN_PROBE(CvNAMED(cx->blk_sub.cv)                            \
 702                         ? HEK_KEY(CvNAME_HEK(cx->blk_sub.cv))           \
 703                         : GvENAME(CvGV(cx->blk_sub.cv)),                \
 704                 CopFILE((COP*)CvSTART((const CV*)cx->blk_sub.cv)),      \
 705                 CopLINE((COP*)CvSTART((const CV*)cx->blk_sub.cv)),      \
 706                 CopSTASHPV((COP*)CvSTART((const CV*)cx->blk_sub.cv)));  \
 707                                                                         \
 708         if (CxHASARGS(cx)) {                                            \
 709             POPSUB_ARGS(cx);                                            \
 710         }                                                               \
 711         POPSUB_COMMON(cx);                                              \
 712     } STMT_END
 713
 714 #define POPFORMAT(cx)                                                   \
 715     STMT_START {                                                        \
 716         CV *cv;                                                         \
 717         GV * const dfout = cx->blk_format.dfoutgv;                      \
 718         setdefout(dfout);                                               \
 719         cx->blk_format.dfoutgv = NULL;                                  \
 720         SvREFCNT_dec_NN(dfout); /* the cx->defoutgv ref */              \
 721         PL_comppad = cx->blk_format.prevcomppad;                        \
 722         PL_curpad = LIKELY(PL_comppad) ? AvARRAY(PL_comppad) : NULL;    \
 723         cv = cx->blk_format.cv;                                         \
 724         cx->blk_format.cv = NULL;;                                      \
 725         --CvDEPTH(cv);                                                  \
 726         SvREFCNT_dec_NN(cv);                                            \
 727     } STMT_END
 728
 729 /* eval context */
 730 struct block_eval {
 731     OP *        retop;  /* op to execute on exit from eval */
 732     /* Above here is the same for sub, format and eval.  */
 733     SV *        old_namesv;
 734     OP *        old_eval_root;
 735     SV *        cur_text;
 736     CV *        cv;
 737     JMPENV *    cur_top_env; /* value of PL_top_env when eval CX created */
 738 };
 739
 740 /* If we ever need more than 512 op types, change the shift from 7.
 741    blku_gimme is actually also only 2 bits, so could be merged with something.
 742 */
 743
 744 #define CxOLD_IN_EVAL(cx)       (((cx)->blk_u16) & 0x7F)
 745 #define CxOLD_OP_TYPE(cx)       (((cx)->blk_u16) >> 7)
 746
 747 #define PUSHEVAL(cx,n)                                                  \
 748     STMT_START {                                                        \
 749         assert(!(PL_in_eval & ~0x7F));                                  \
 750         assert(!(PL_op->op_type & ~0x1FF));                             \
 751         cx->blk_u16 = (PL_in_eval & 0x7F) | ((U16)PL_op->op_type << 7); \
 752         cx->blk_eval.old_namesv = (n ? newSVpv(n,0) : NULL);            \
 753         cx->blk_eval.old_eval_root = PL_eval_root;                      \
 754         cx->blk_eval.cur_text = PL_parser ? PL_parser->linestr : NULL;  \
 755         cx->blk_eval.cv = NULL; /* set by doeval_compile() as applicable */ \
 756         cx->blk_eval.retop = NULL;                                      \
 757         cx->blk_eval.cur_top_env = PL_top_env;                          \
 758     } STMT_END
 759
 760 #define POPEVAL(cx)                                                     \
 761     STMT_START {                                                        \
 762         SV *sv;                                                         \
 763         PL_in_eval = CxOLD_IN_EVAL(cx);                                 \
 764         PL_eval_root = cx->blk_eval.old_eval_root;                      \
 765         sv = cx->blk_eval.cur_text;                                     \
 766         if (sv && SvSCREAM(sv)) {                                       \
 767             cx->blk_eval.cur_text = NULL;                               \
 768             SvREFCNT_dec_NN(sv);                                        \
 769         }                                                               \
 770         sv = cx->blk_eval.old_namesv;                                   \
 771         if (sv && !SvTEMP(sv))/* TEMP => POPEVAL re-entrantly called */ \
 772             sv_2mortal(sv);                                             \
 773     } STMT_END
 774
 775 /* loop context */
 776 struct block_loop {
 777     LOOP *      my_op;  /* My op, that contains redo, next and last ops.  */
 778     union {     /* different ways of locating the iteration variable */
 779         SV      **svp; /* for lexicals: address of pad slot */
 780         GV      *gv;   /* for package vars */
 781     } itervar_u;
 782     SV          *itersave; /* the original iteration var */
 783     union {
 784         struct { /* CXt_LOOP_ARY, C<for (@ary)>  */
 785             AV *ary; /* array being iterated over */
 786             IV  ix;   /* index relative to base of array */
 787         } ary;
 788         struct { /* CXt_LOOP_LIST, C<for (list)> */
 789             I32 basesp; /* first element of list on stack */
 790             IV  ix;      /* index relative to basesp */
 791         } stack;
 792         struct { /* CXt_LOOP_LAZYIV, C<for (1..9)> */
 793             IV cur;
 794             IV end;
 795         } lazyiv;
 796         struct { /* CXt_LOOP_LAZYSV C<for ('a'..'z')> */
 797             SV * cur;
 798             SV * end; /* maxiumum value (or minimum in reverse) */
 799         } lazysv;
 800     } state_u;
 801 #ifdef USE_ITHREADS
 802     PAD *oldcomppad; /* needed to map itervar_u.svp during thread clone */
 803 #endif
 804 };
 805
 806 #define CxITERVAR(c)                                    \
 807         (CxPADLOOP(c)                                   \
 808             ? (c)->blk_loop.itervar_u.svp               \
 809             : ((c)->cx_type & CXp_FOR_GV)               \
 810                 ? &GvSV((c)->blk_loop.itervar_u.gv)     \
 811                 : (SV **)&(c)->blk_loop.itervar_u.gv)
 812
 813 #define CxLABEL(c)      (0 + CopLABEL((c)->blk_oldcop))
 814 #define CxLABEL_len(c,len)      (0 + CopLABEL_len((c)->blk_oldcop, len))
 815 #define CxLABEL_len_flags(c,len,flags)  (0 + CopLABEL_len_flags((c)->blk_oldcop, len, flags))
 816 #define CxHASARGS(c)    (((c)->cx_type & CXp_HASARGS) == CXp_HASARGS)
 817 #define CxLVAL(c)       (0 + ((c)->blk_u16 & 0xff))
 818
 819
 820 #define PUSHLOOP_PLAIN(cx)                                              \
 821         cx->blk_loop.my_op = cLOOP;                                     \
 822         cx->blk_oldsaveix = PL_savestack_ix;
 823
 824 #ifdef USE_ITHREADS
 825 #  define PUSHLOOP_FOR_setpad(c) (c)->blk_loop.oldcomppad = PL_comppad
 826 #else
 827 #  define PUSHLOOP_FOR_setpad(c) NOOP
 828 #endif
 829
 830 #define PUSHLOOP_FOR(cx, ivar, isave)                                   \
 831         cx->blk_loop.my_op = cLOOP;                                     \
 832         cx->blk_loop.itervar_u.svp = (SV**)(ivar);                      \
 833         cx->blk_oldsaveix = PL_savestack_ix;                                \
 834         cx->blk_loop.itersave = isave;                                  \
 835         PUSHLOOP_FOR_setpad(cx);
 836
 837 #define POPLOOP(cx)                                                     \
 838         if (CxTYPE(cx) == CXt_LOOP_LAZYSV) {                            \
 839             SV *sv = cx->blk_loop.state_u.lazysv.cur;                   \
 840             cx->blk_loop.state_u.lazysv.cur = NULL;                     \
 841             SvREFCNT_dec_NN(sv);                                        \
 842             sv = cx->blk_loop.state_u.lazysv.end;                       \
 843             cx->blk_loop.state_u.lazysv.end = NULL;                     \
 844             SvREFCNT_dec_NN(sv);                                        \
 845         }                                                               \
 846         else if (CxTYPE(cx) == CXt_LOOP_ARY) {                          \
 847             AV *av = cx->blk_loop.state_u.ary.ary;                      \
 848             cx->blk_loop.state_u.ary.ary = NULL;                        \
 849             SvREFCNT_dec(av);                                           \
 850         }                                                               \
 851         if (cx->cx_type & (CXp_FOR_PAD|CXp_FOR_GV)) {                   \
 852             SV *cursv;                                                  \
 853             SV **svp = (cx)->blk_loop.itervar_u.svp;                    \
 854             if ((cx->cx_type & CXp_FOR_GV))                             \
 855                 svp = &GvSV((GV*)svp);                                  \
 856             cursv = *svp;                                               \
 857             *svp = cx->blk_loop.itersave;                               \
 858             cx->blk_loop.itersave = NULL;                               \
 859             SvREFCNT_dec(cursv);                                        \
 860         }
 861
 862 /* given/when context */
 863 struct block_givwhen {
 864         OP *leave_op;
 865         SV *defsv_save; /* the original $_ */
 866 };
 867
 868 #define PUSHWHEN(cx)                                                    \
 869         cx->blk_oldsaveix = PL_savestack_ix;                            \
 870         cx->blk_givwhen.leave_op = cLOGOP->op_other;
 871
 872 #define PUSHGIVEN(cx, orig_var)                                         \
 873         PUSHWHEN(cx);                                                   \
 874         cx->blk_givwhen.defsv_save = orig_var;
 875
 876 #define POPWHEN(cx)                                                     \
 877         NOOP;
 878
 879 #define POPGIVEN(cx)                                                    \
 880     STMT_START {                                                        \
 881         SV *sv = GvSV(PL_defgv);                                        \
 882         GvSV(PL_defgv) = cx->blk_givwhen.defsv_save;                    \
 883         cx->blk_givwhen.defsv_save = NULL;                              \
 884         SvREFCNT_dec(sv);                                               \
 885     } STMT_END
 886
 887
 888 /* basic block, i.e. pp_enter/leave */
 889
 890 #define PUSHBASICBLK(cx)                                                \
 891         cx->blk_oldsaveix = PL_savestack_ix;
 892
 893 #define POPBASICBLK(cx)                                                 \
 894         NOOP;
 895
 896
 897 /* context common to subroutines, evals and loops */
 898 struct block {
 899     U8          blku_type;      /* what kind of context this is */
 900     U8          blku_gimme;     /* is this block running in list context? */
 901     U16         blku_u16;       /* used by block_sub and block_eval (so far) */
 902     I32         blku_oldsaveix; /* saved PL_savestack_ix */
 903     /* all the fields above must be aligned with same-sized fields as sbu */
 904     I32         blku_oldsp;     /* current sp floor: where nextstate pops to */
 905     I32         blku_oldmarksp; /* mark stack index */
 906     COP *       blku_oldcop;    /* old curcop pointer */
 907     PMOP *      blku_oldpm;     /* values of pattern match vars */
 908     SSize_t     blku_old_tmpsfloor;     /* saved PL_tmps_floor */
 909     I32         blku_oldscopesp;        /* scope stack index */
 910
 911     union {
 912         struct block_sub        blku_sub;
 913         struct block_format     blku_format;
 914         struct block_eval       blku_eval;
 915         struct block_loop       blku_loop;
 916         struct block_givwhen    blku_givwhen;
 917     } blk_u;
 918 };
 919 #define blk_oldsp       cx_u.cx_blk.blku_oldsp
 920 #define blk_oldcop      cx_u.cx_blk.blku_oldcop
 921 #define blk_oldmarksp   cx_u.cx_blk.blku_oldmarksp
 922 #define blk_oldscopesp  cx_u.cx_blk.blku_oldscopesp
 923 #define blk_oldpm       cx_u.cx_blk.blku_oldpm
 924 #define blk_gimme       cx_u.cx_blk.blku_gimme
 925 #define blk_u16         cx_u.cx_blk.blku_u16
 926 #define blk_oldsaveix   cx_u.cx_blk.blku_oldsaveix
 927 #define blk_sub         cx_u.cx_blk.blk_u.blku_sub
 928 #define blk_format      cx_u.cx_blk.blk_u.blku_format
 929 #define blk_eval        cx_u.cx_blk.blk_u.blku_eval
 930 #define blk_loop        cx_u.cx_blk.blk_u.blku_loop
 931 #define blk_givwhen     cx_u.cx_blk.blk_u.blku_givwhen
 932
 933 #define DEBUG_CX(action)                                                \
 934     DEBUG_l(                                                            \
 935         Perl_deb(aTHX_ "CX %ld %s %s (scope %ld,%ld) (save %ld,%ld) at %s:%d\n",\
 936                     (long)cxstack_ix,                                   \
 937                     action,                                             \
 938                     PL_block_type[CxTYPE(CX_CUR())],                    \
 939                     (long)PL_scopestack_ix,                             \
 940                     (long)(CX_CUR()->blk_oldscopesp),                   \
 941                     (long)PL_savestack_ix,                              \
 942                     (long)(CX_CUR()->blk_oldsaveix),                    \
 943                     __FILE__, __LINE__));
 944
 945 /* Enter a block. */
 946 #define PUSHBLOCK(cx,t,sp) CXINC, cx = CX_CUR(),                        \
 947         cx->cx_type             = t,                                    \
 948         cx->blk_oldsp           = sp - PL_stack_base,                   \
 949         cx->blk_oldcop          = PL_curcop,                            \
 950         cx->blk_oldmarksp       = PL_markstack_ptr - PL_markstack,      \
 951         cx->blk_oldscopesp      = PL_scopestack_ix,                     \
 952         cx->blk_oldpm           = PL_curpm,                             \
 953         cx->blk_gimme           = (U8)gimme;                            \
 954         cx->cx_u.cx_blk.blku_old_tmpsfloor = PL_tmps_floor;             \
 955         PL_tmps_floor           = PL_tmps_ix;                           \
 956         DEBUG_CX("PUSH");
 957
 958 /* Exit a block (RETURN and LAST). */
 959 #define POPBLOCK(cx)                                                    \
 960         DEBUG_CX("POP");                                                \
 961         PL_curcop        = cx->blk_oldcop,                              \
 962         PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
 963         PL_scopestack_ix = cx->blk_oldscopesp,                          \
 964         /* LEAVE_SCOPE() should have made this true. /(?{})/ cheats
 965          * and leaves a CX entry lying around for repeated use, so
 966          * skip for multicall */                  \
 967         assert(   (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx))            \
 968                 || PL_savestack_ix == cx->blk_oldsaveix);               \
 969         PL_tmps_floor = cx->cx_u.cx_blk.blku_old_tmpsfloor;             \
 970         PL_curpm         = cx->blk_oldpm;
 971
 972 /* Continue a block elsewhere (NEXT and REDO). */
 973 #define TOPBLOCK(cx)                                                    \
 974         DEBUG_CX("TOP");                                                \
 975         cx = CX_CUR(),                                                  \
 976         PL_stack_sp      = PL_stack_base + cx->blk_oldsp,               \
 977         PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
 978         PL_scopestack_ix = cx->blk_oldscopesp,                          \
 979         PL_curpm         = cx->blk_oldpm;
 980
 981 /* substitution context */
 982 struct subst {
 983     U8          sbu_type;       /* same as blku_type */
 984     U8          sbu_rflags;
 985     U16         sbu_rxtainted;
 986     I32         sbu_oldsaveix; /* same as blku_oldsaveix */
 987     /* all the fields above must be aligned with same-sized fields as blku * */
 988     SSize_t     sbu_iters;
 989     SSize_t     sbu_maxiters;
 990     char *      sbu_orig;
 991     SV *        sbu_dstr;
 992     SV *        sbu_targ;
 993     char *      sbu_s;
 994     char *      sbu_m;
 995     char *      sbu_strend;
 996     void *      sbu_rxres;
 997     REGEXP *    sbu_rx;
 998 };
 999 #define sb_iters        cx_u.cx_subst.sbu_iters
1000 #define sb_maxiters     cx_u.cx_subst.sbu_maxiters
1001 #define sb_rflags       cx_u.cx_subst.sbu_rflags
1002 #define sb_rxtainted    cx_u.cx_subst.sbu_rxtainted
1003 #define sb_orig         cx_u.cx_subst.sbu_orig
1004 #define sb_dstr         cx_u.cx_subst.sbu_dstr
1005 #define sb_targ         cx_u.cx_subst.sbu_targ
1006 #define sb_s            cx_u.cx_subst.sbu_s
1007 #define sb_m            cx_u.cx_subst.sbu_m
1008 #define sb_strend       cx_u.cx_subst.sbu_strend
1009 #define sb_rxres        cx_u.cx_subst.sbu_rxres
1010 #define sb_rx           cx_u.cx_subst.sbu_rx
1011
1012 #ifdef PERL_CORE
1013 #  define PUSHSUBST(cx) CXINC, cx = CX_CUR(),                           \
1014         cx->blk_oldsaveix = oldsave,                                    \
1015         cx->sb_iters            = iters,                                \
1016         cx->sb_maxiters         = maxiters,                             \
1017         cx->sb_rflags           = r_flags,                              \
1018         cx->sb_rxtainted        = rxtainted,                            \
1019         cx->sb_orig             = orig,                                 \
1020         cx->sb_dstr             = dstr,                                 \
1021         cx->sb_targ             = targ,                                 \
1022         cx->sb_s                = s,                                    \
1023         cx->sb_m                = m,                                    \
1024         cx->sb_strend           = strend,                               \
1025         cx->sb_rxres            = NULL,                                 \
1026         cx->sb_rx               = rx,                                   \
1027         cx->cx_type             = CXt_SUBST | (once ? CXp_ONCE : 0);    \
1028         rxres_save(&cx->sb_rxres, rx);                                  \
1029         (void)ReREFCNT_inc(rx);                                         \
1030         SvREFCNT_inc_void_NN(targ)
1031
1032 #  define POPSUBST(cx) \
1033     STMT_START {                                                        \
1034         REGEXP *re;                                                     \
1035         rxres_free(&cx->sb_rxres);                                      \
1036         re = cx->sb_rx;                                                 \
1037         cx->sb_rx = NULL;                                               \
1038         ReREFCNT_dec(re);                                               \
1039         SvREFCNT_dec_NN(cx->sb_targ);                                   \
1040     } STMT_END
1041 #endif
1042
1043 #define CxONCE(cx)              ((cx)->cx_type & CXp_ONCE)
1044
1045 struct context {
1046     union {
1047         struct block    cx_blk;
1048         struct subst    cx_subst;
1049     } cx_u;
1050 };
1051 #define cx_type cx_u.cx_subst.sbu_type
1052
1053 /* If you re-order these, there is also an array of uppercase names in perl.h
1054    and a static array of context names in pp_ctl.c  */
1055 #define CXTYPEMASK      0xf
1056 #define CXt_NULL        0 /* currently only used for sort BLOCK */
1057 #define CXt_WHEN        1
1058 #define CXt_BLOCK       2
1059 /* When micro-optimising :-) keep GIVEN next to the LOOPs, as these 5 share a
1060    jump table in pp_ctl.c
1061    The first 4 don't have a 'case' in at least one switch statement in pp_ctl.c
1062 */
1063 #define CXt_GIVEN       3
1064
1065 /* be careful of the ordering of these five. Macros like CxTYPE_is_LOOP,
1066  * CxFOREACH compare ranges */
1067 #define CXt_LOOP_PLAIN  4 /*                {} */
1068 #define CXt_LOOP_LAZYIV 5 /* for (1..9)     {} */
1069 #define CXt_LOOP_LAZYSV 6 /* for ('a'..'z') {} */
1070 #define CXt_LOOP_LIST   7 /* for (1,2,3)    {} */
1071 #define CXt_LOOP_ARY    8 /* for (@ary)     {} */
1072
1073 #define CXt_SUB         9
1074 #define CXt_FORMAT     10
1075 #define CXt_EVAL       11
1076 #define CXt_SUBST      12
1077 /* SUBST doesn't feature in all switch statements.  */
1078
1079 /* private flags for CXt_SUB and CXt_FORMAT */
1080 #define CXp_MULTICALL   0x10    /* part of a multicall (so don't tear down
1081                                    context on exit). (not CXt_FORMAT) */
1082 #define CXp_HASARGS     0x20
1083 #define CXp_SUB_RE      0x40    /* code called within regex, i.e. (?{}) */
1084 #define CXp_SUB_RE_FAKE 0x80    /* fake sub CX for (?{}) in current scope */
1085
1086 /* private flags for CXt_EVAL */
1087 #define CXp_REAL        0x20    /* truly eval'', not a lookalike */
1088 #define CXp_TRYBLOCK    0x40    /* eval{}, not eval'' or similar */
1089
1090 /* private flags for CXt_LOOP */
1091 #define CXp_FOR_DEF     0x10    /* foreach using $_ */
1092 #define CXp_FOR_LVREF   0x20    /* foreach using \$var */
1093 #define CXp_FOR_GV      0x40    /* foreach using package var */
1094 #define CXp_FOR_PAD     0x80    /* foreach using lexical var */
1095 #define CxPADLOOP(c)    ((c)->cx_type & CXp_FOR_PAD)
1096
1097 /* private flags for CXt_SUBST */
1098 #define CXp_ONCE        0x10    /* What was sbu_once in struct subst */
1099
1100 #define CxTYPE(c)       ((c)->cx_type & CXTYPEMASK)
1101 #define CxTYPE_is_LOOP(c) (   CxTYPE(cx) >= CXt_LOOP_PLAIN              \
1102                            && CxTYPE(cx) <= CXt_LOOP_ARY)
1103 #define CxMULTICALL(c)  ((c)->cx_type & CXp_MULTICALL)
1104 #define CxREALEVAL(c)   (((c)->cx_type & (CXTYPEMASK|CXp_REAL))         \
1105                          == (CXt_EVAL|CXp_REAL))
1106 #define CxTRYBLOCK(c)   (((c)->cx_type & (CXTYPEMASK|CXp_TRYBLOCK))     \
1107                          == (CXt_EVAL|CXp_TRYBLOCK))
1108 #define CxFOREACH(c)    (   CxTYPE(cx) >= CXt_LOOP_LAZYSV               \
1109                          && CxTYPE(cx) <= CXt_LOOP_ARY)
1110
1111 #define CXINC (cxstack_ix < cxstack_max ? ++cxstack_ix : (cxstack_ix = cxinc()))
1112
1113 /*
1114 =head1 "Gimme" Values
1115 */
1116
1117 /*
1118 =for apidoc AmU||G_SCALAR
1119 Used to indicate scalar context.  See C<L</GIMME_V>>, C<L</GIMME>>, and
1120 L<perlcall>.
1121
1122 =for apidoc AmU||G_ARRAY
1123 Used to indicate list context.  See C<L</GIMME_V>>, C<L</GIMME>> and
1124 L<perlcall>.
1125
1126 =for apidoc AmU||G_VOID
1127 Used to indicate void context.  See C<L</GIMME_V>> and L<perlcall>.
1128
1129 =for apidoc AmU||G_DISCARD
1130 Indicates that arguments returned from a callback should be discarded.  See
1131 L<perlcall>.
1132
1133 =for apidoc AmU||G_EVAL
1134
1135 Used to force a Perl C<eval> wrapper around a callback.  See
1136 L<perlcall>.
1137
1138 =for apidoc AmU||G_NOARGS
1139
1140 Indicates that no arguments are being sent to a callback.  See
1141 L<perlcall>.
1142
1143 =cut
1144 */
1145
1146 #define G_SCALAR        2
1147 #define G_ARRAY         3
1148 #define G_VOID          1
1149 #define G_WANT          3
1150
1151 /* extra flags for Perl_call_* routines */
1152 #define G_DISCARD       4       /* Call FREETMPS.
1153                                    Don't change this without consulting the
1154                                    hash actions codes defined in hv.h */
1155 #define G_EVAL          8       /* Assume eval {} around subroutine call. */
1156 #define G_NOARGS       16       /* Don't construct a @_ array. */
1157 #define G_KEEPERR      32       /* Warn for errors, don't overwrite $@ */
1158 #define G_NODEBUG      64       /* Disable debugging at toplevel.  */
1159 #define G_METHOD      128       /* Calling method. */
1160 #define G_FAKINGEVAL  256       /* Faking an eval context for call_sv or
1161                                    fold_constants. */
1162 #define G_UNDEF_FILL  512       /* Fill the stack with &PL_sv_undef
1163                                    A special case for UNSHIFT in
1164                                    Perl_magic_methcall().  */
1165 #define G_WRITING_TO_STDERR 1024 /* Perl_write_to_stderr() is calling
1166                                     Perl_magic_methcall().  */
1167 #define G_RE_REPARSING 0x800     /* compiling a run-time /(?{..})/ */
1168 #define G_METHOD_NAMED 4096     /* calling named method, eg without :: or ' */
1169
1170 /* flag bits for PL_in_eval */
1171 #define EVAL_NULL       0       /* not in an eval */
1172 #define EVAL_INEVAL     1       /* some enclosing scope is an eval */
1173 #define EVAL_WARNONLY   2       /* used by yywarn() when calling yyerror() */
1174 #define EVAL_KEEPERR    4       /* set by Perl_call_sv if G_KEEPERR */
1175 #define EVAL_INREQUIRE  8       /* The code is being required. */
1176 #define EVAL_RE_REPARSING 0x10  /* eval_sv() called with G_RE_REPARSING */
1177
1178 /* Support for switching (stack and block) contexts.
1179  * This ensures magic doesn't invalidate local stack and cx pointers.
1180  */
1181
1182 #define PERLSI_UNKNOWN          -1
1183 #define PERLSI_UNDEF            0
1184 #define PERLSI_MAIN             1
1185 #define PERLSI_MAGIC            2
1186 #define PERLSI_SORT             3
1187 #define PERLSI_SIGNAL           4
1188 #define PERLSI_OVERLOAD         5
1189 #define PERLSI_DESTROY          6
1190 #define PERLSI_WARNHOOK         7
1191 #define PERLSI_DIEHOOK          8
1192 #define PERLSI_REQUIRE          9
1193 #define PERLSI_MULTICALL       10
1194
1195 struct stackinfo {
1196     AV *                si_stack;       /* stack for current runlevel */
1197     PERL_CONTEXT *      si_cxstack;     /* context stack for runlevel */
1198     struct stackinfo *  si_prev;
1199     struct stackinfo *  si_next;
1200     I32                 si_cxix;        /* current context index */
1201     I32                 si_cxmax;       /* maximum allocated index */
1202     I32                 si_type;        /* type of runlevel */
1203     I32                 si_markoff;     /* offset where markstack begins for us.
1204                                          * currently used only with DEBUGGING,
1205                                          * but not #ifdef-ed for bincompat */
1206 };
1207
1208 typedef struct stackinfo PERL_SI;
1209
1210 #define cxstack         (PL_curstackinfo->si_cxstack)
1211 #define cxstack_ix      (PL_curstackinfo->si_cxix)
1212 #define cxstack_max     (PL_curstackinfo->si_cxmax)
1213
1214 #ifdef DEBUGGING
1215 #  define       SET_MARK_OFFSET \
1216     PL_curstackinfo->si_markoff = PL_markstack_ptr - PL_markstack
1217 #else
1218 #  define       SET_MARK_OFFSET NOOP
1219 #endif
1220
1221 #define PUSHSTACKi(type) \
1222     STMT_START {                                                        \
1223         PERL_SI *next = PL_curstackinfo->si_next;                       \
1224         DEBUG_l({                                                       \
1225             int i = 0; PERL_SI *p = PL_curstackinfo;                    \
1226             while (p) { i++; p = p->si_prev; }                          \
1227             Perl_deb(aTHX_ "push STACKINFO %d at %s:%d\n",              \
1228                          i, __FILE__, __LINE__);})                      \
1229         if (!next) {                                                    \
1230             next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1);    \
1231             next->si_prev = PL_curstackinfo;                            \
1232             PL_curstackinfo->si_next = next;                            \
1233         }                                                               \
1234         next->si_type = type;                                           \
1235         next->si_cxix = -1;                                             \
1236         AvFILLp(next->si_stack) = 0;                                    \
1237         SWITCHSTACK(PL_curstack,next->si_stack);                        \
1238         PL_curstackinfo = next;                                         \
1239         SET_MARK_OFFSET;                                                \
1240     } STMT_END
1241
1242 #define PUSHSTACK PUSHSTACKi(PERLSI_UNKNOWN)
1243
1244 /* POPSTACK works with PL_stack_sp, so it may need to be bracketed by
1245  * PUTBACK/SPAGAIN to flush/refresh any local SP that may be active */
1246 #define POPSTACK \
1247     STMT_START {                                                        \
1248         dSP;                                                            \
1249         PERL_SI * const prev = PL_curstackinfo->si_prev;                \
1250         DEBUG_l({                                                       \
1251             int i = -1; PERL_SI *p = PL_curstackinfo;                   \
1252             while (p) { i++; p = p->si_prev; }                          \
1253             Perl_deb(aTHX_ "pop  STACKINFO %d at %s:%d\n",              \
1254                          i, __FILE__, __LINE__);})                      \
1255         if (!prev) {                                                    \
1256             Perl_croak_popstack();                                      \
1257         }                                                               \
1258         SWITCHSTACK(PL_curstack,prev->si_stack);                        \
1259         /* don't free prev here, free them all at the END{} */          \
1260         PL_curstackinfo = prev;                                         \
1261     } STMT_END
1262
1263 #define POPSTACK_TO(s) \
1264     STMT_START {                                                        \
1265         while (PL_curstack != s) {                                      \
1266             dounwind(-1);                                               \
1267             POPSTACK;                                                   \
1268         }                                                               \
1269     } STMT_END
1270
1271 #define IN_PERL_COMPILETIME     (PL_curcop == &PL_compiling)
1272 #define IN_PERL_RUNTIME         (PL_curcop != &PL_compiling)
1273
1274 /*
1275 =head1 Multicall Functions
1276
1277 =for apidoc Ams||dMULTICALL
1278 Declare local variables for a multicall.  See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1279
1280 =for apidoc Ams||PUSH_MULTICALL
1281 Opening bracket for a lightweight callback.
1282 See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1283
1284 =for apidoc Ams||MULTICALL
1285 Make a lightweight callback.  See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1286
1287 =for apidoc Ams||POP_MULTICALL
1288 Closing bracket for a lightweight callback.
1289 See L<perlcall/LIGHTWEIGHT CALLBACKS>.
1290
1291 =cut
1292 */
1293
1294 #define dMULTICALL \
1295     SV **newsp;                 /* set by POPBLOCK */                   \
1296     PERL_CONTEXT *cx;                                                   \
1297     CV *multicall_cv;                                                   \
1298     OP *multicall_cop;                                                  \
1299     bool multicall_oldcatch;                                            \
1300     U8 hasargs = 0              /* used by PUSHSUB */
1301
1302 #define PUSH_MULTICALL(the_cv) \
1303     PUSH_MULTICALL_FLAGS(the_cv, 0)
1304
1305 /* Like PUSH_MULTICALL, but allows you to specify extra flags
1306  * for the CX stack entry (this isn't part of the public API) */
1307
1308 #define PUSH_MULTICALL_FLAGS(the_cv, flags) \
1309     STMT_START {                                                        \
1310         CV * const _nOnclAshIngNamE_ = the_cv;                          \
1311         CV * const cv = _nOnclAshIngNamE_;                              \
1312         PADLIST * const padlist = CvPADLIST(cv);                        \
1313         multicall_oldcatch = CATCH_GET;                                 \
1314         CATCH_SET(TRUE);                                                \
1315         PUSHSTACKi(PERLSI_MULTICALL);                                   \
1316         PUSHBLOCK(cx, (CXt_SUB|CXp_MULTICALL|flags), PL_stack_sp);      \
1317         PUSHSUB(cx);                                                    \
1318         cx->blk_oldsaveix = PL_savestack_ix;                            \
1319         SAVEVPTR(PL_op);                                                \
1320         if (!(flags & CXp_SUB_RE_FAKE))                                 \
1321             CvDEPTH(cv)++;                                              \
1322         if (CvDEPTH(cv) >= 2) {                                         \
1323             PERL_STACK_OVERFLOW_CHECK();                                \
1324             Perl_pad_push(aTHX_ padlist, CvDEPTH(cv));                  \
1325         }                                                               \
1326         PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));                       \
1327         multicall_cv = cv;                                              \
1328         PERL_UNUSED_VAR(multicall_cv); /* for API */                    \
1329         multicall_cop = CvSTART(cv);                                    \
1330     } STMT_END
1331
1332 #define MULTICALL \
1333     STMT_START {                                                        \
1334         PL_op = multicall_cop;                                          \
1335         CALLRUNOPS(aTHX);                                               \
1336     } STMT_END
1337
1338 #define POP_MULTICALL \
1339     STMT_START {                                                        \
1340         cx = CX_CUR();                                                  \
1341         CX_LEAVE_SCOPE(cx);                                             \
1342         POPSUB_COMMON(cx);                                              \
1343         newsp = PL_stack_base + cx->blk_oldsp;                          \
1344         gimme = cx->blk_gimme;                                          \
1345         PERL_UNUSED_VAR(newsp); /* for API */                           \
1346         PERL_UNUSED_VAR(gimme); /* for API */                           \
1347         POPBLOCK(cx);                                                   \
1348         CX_POP(cx);                                                     \
1349         POPSTACK;                                                       \
1350         CATCH_SET(multicall_oldcatch);                                  \
1351         SPAGAIN;                                                        \
1352     } STMT_END
1353
1354 /* Change the CV of an already-pushed MULTICALL CxSUB block.
1355  * (this isn't part of the public API) */
1356
1357 #define CHANGE_MULTICALL_FLAGS(the_cv, flags) \
1358     STMT_START {                                                        \
1359         CV * const _nOnclAshIngNamE_ = the_cv;                          \
1360         CV * const cv = _nOnclAshIngNamE_;                              \
1361         PADLIST * const padlist = CvPADLIST(cv);                        \
1362         cx = CX_CUR();                                                  \
1363         assert(CxMULTICALL(cx));                                        \
1364         POPSUB_COMMON(cx);                                              \
1365         cx->cx_type = (CXt_SUB|CXp_MULTICALL|flags);                    \
1366         PUSHSUB(cx);                                                    \
1367         if (!(flags & CXp_SUB_RE_FAKE))                                 \
1368             CvDEPTH(cv)++;                                              \
1369         if (CvDEPTH(cv) >= 2) {                                         \
1370             PERL_STACK_OVERFLOW_CHECK();                                \
1371             Perl_pad_push(aTHX_ padlist, CvDEPTH(cv));                  \
1372         }                                                               \
1373         PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));                       \
1374         multicall_cv = cv;                                              \
1375         multicall_cop = CvSTART(cv);                                    \
1376     } STMT_END
1377 /*
1378  * ex: set ts=8 sts=4 sw=4 et:
1379  */