indirect.xs

   1 /* This file is part of the indirect Perl module.
   2  * See http://search.cpan.org/dist/indirect/ */
   3
   4 #define PERL_NO_GET_CONTEXT
   5 #include "EXTERN.h"
   6 #include "perl.h"
   7 #include "XSUB.h"
   8
   9 #define __PACKAGE__     "indirect"
  10 #define __PACKAGE_LEN__ (sizeof(__PACKAGE__)-1)
  11
  12 /* --- Compatibility wrappers ---------------------------------------------- */
  13
  14 #ifndef NOOP
  15 # define NOOP
  16 #endif
  17
  18 #ifndef dNOOP
  19 # define dNOOP
  20 #endif
  21
  22 #ifndef Newx
  23 # define Newx(v, n, c) New(0, v, n, c)
  24 #endif
  25
  26 #ifndef SvPV_const
  27 # define SvPV_const SvPV
  28 #endif
  29
  30 #ifndef SvPV_nolen_const
  31 # define SvPV_nolen_const SvPV_nolen
  32 #endif
  33
  34 #ifndef SvPVX_const
  35 # define SvPVX_const SvPVX
  36 #endif
  37
  38 #ifndef SvREFCNT_inc_simple_void_NN
  39 # ifdef SvREFCNT_inc_simple_NN
  40 #  define SvREFCNT_inc_simple_void_NN SvREFCNT_inc_simple_NN
  41 # else
  42 #  define SvREFCNT_inc_simple_void_NN SvREFCNT_inc
  43 # endif
  44 #endif
  45
  46 #ifndef sv_catpvn_nomg
  47 # define sv_catpvn_nomg sv_catpvn
  48 #endif
  49
  50 #ifndef mPUSHp
  51 # define mPUSHp(P, L) PUSHs(sv_2mortal(newSVpvn((P), (L))))
  52 #endif
  53
  54 #ifndef mPUSHu
  55 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
  56 #endif
  57
  58 #ifndef HvNAME_get
  59 # define HvNAME_get(H) HvNAME(H)
  60 #endif
  61
  62 #ifndef HvNAMELEN_get
  63 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
  64 #endif
  65
  66 #define I_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
  67
  68 #if I_HAS_PERL(5, 10, 0) || defined(PL_parser)
  69 # ifndef PL_linestr
  70 #  define PL_linestr PL_parser->linestr
  71 # endif
  72 # ifndef PL_bufptr
  73 #  define PL_bufptr PL_parser->bufptr
  74 # endif
  75 # ifndef PL_oldbufptr
  76 #  define PL_oldbufptr PL_parser->oldbufptr
  77 # endif
  78 #else
  79 # ifndef PL_linestr
  80 #  define PL_linestr PL_Ilinestr
  81 # endif
  82 # ifndef PL_bufptr
  83 #  define PL_bufptr PL_Ibufptr
  84 # endif
  85 # ifndef PL_oldbufptr
  86 #  define PL_oldbufptr PL_Ioldbufptr
  87 # endif
  88 #endif
  89
  90 #ifndef I_WORKAROUND_REQUIRE_PROPAGATION
  91 # define I_WORKAROUND_REQUIRE_PROPAGATION !I_HAS_PERL(5, 10, 1)
  92 #endif
  93
  94 /* ... Thread safety and multiplicity ...................................... */
  95
  96 /* Safe unless stated otherwise in Makefile.PL */
  97 #ifndef I_FORKSAFE
  98 # define I_FORKSAFE 1
  99 #endif
 100
 101 #ifndef I_MULTIPLICITY
 102 # if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
 103 #  define I_MULTIPLICITY 1
 104 # else
 105 #  define I_MULTIPLICITY 0
 106 # endif
 107 #endif
 108 #if I_MULTIPLICITY && !defined(tTHX)
 109 # define tTHX PerlInterpreter*
 110 #endif
 111
 112 #if I_MULTIPLICITY && defined(USE_ITHREADS) && defined(dMY_CXT) && defined(MY_CXT) && defined(START_MY_CXT) && defined(MY_CXT_INIT) && (defined(MY_CXT_CLONE) || defined(dMY_CXT_SV))
 113 # define I_THREADSAFE 1
 114 # ifndef MY_CXT_CLONE
 115 #  define MY_CXT_CLONE \
 116     dMY_CXT_SV;                                                      \
 117     my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
 118     Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
 119     sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
 120 # endif
 121 #else
 122 # define I_THREADSAFE 0
 123 # undef  dMY_CXT
 124 # define dMY_CXT      dNOOP
 125 # undef  MY_CXT
 126 # define MY_CXT       indirect_globaldata
 127 # undef  START_MY_CXT
 128 # define START_MY_CXT STATIC my_cxt_t MY_CXT;
 129 # undef  MY_CXT_INIT
 130 # define MY_CXT_INIT  NOOP
 131 # undef  MY_CXT_CLONE
 132 # define MY_CXT_CLONE NOOP
 133 #endif
 134
 135 /* --- Helpers ------------------------------------------------------------- */
 136
 137 /* ... Thread-safe hints ................................................... */
 138
 139 #if I_WORKAROUND_REQUIRE_PROPAGATION
 140
 141 typedef struct {
 142  SV *code;
 143  IV  require_tag;
 144 } indirect_hint_t;
 145
 146 #define I_HINT_STRUCT 1
 147
 148 #define I_HINT_CODE(H) ((H)->code)
 149
 150 #define I_HINT_FREE(H) {   \
 151  indirect_hint_t *h = (H); \
 152  SvREFCNT_dec(h->code);    \
 153  PerlMemShared_free(h);    \
 154 }
 155
 156 #else  /*  I_WORKAROUND_REQUIRE_PROPAGATION */
 157
 158 typedef SV indirect_hint_t;
 159
 160 #define I_HINT_STRUCT 0
 161
 162 #define I_HINT_CODE(H) (H)
 163
 164 #define I_HINT_FREE(H) SvREFCNT_dec(H);
 165
 166 #endif /* !I_WORKAROUND_REQUIRE_PROPAGATION */
 167
 168 #if I_THREADSAFE
 169
 170 #define PTABLE_NAME        ptable_hints
 171 #define PTABLE_VAL_FREE(V) I_HINT_FREE(V)
 172
 173 #define pPTBL  pTHX
 174 #define pPTBL_ pTHX_
 175 #define aPTBL  aTHX
 176 #define aPTBL_ aTHX_
 177
 178 #include "ptable.h"
 179
 180 #define ptable_hints_store(T, K, V) ptable_hints_store(aTHX_ (T), (K), (V))
 181 #define ptable_hints_free(T)        ptable_hints_free(aTHX_ (T))
 182
 183 #endif /* I_THREADSAFE */
 184
 185 /* Define the op->str ptable here because we need to be able to clean it during
 186  * thread cleanup. */
 187
 188 typedef struct {
 189  char   *buf;
 190  STRLEN  pos;
 191  STRLEN  size;
 192  STRLEN  len;
 193  line_t  line;
 194 } indirect_op_info_t;
 195
 196 #define PTABLE_NAME        ptable
 197 #define PTABLE_VAL_FREE(V) if (V) { Safefree(((indirect_op_info_t *) (V))->buf); Safefree(V); }
 198
 199 #define pPTBL  pTHX
 200 #define pPTBL_ pTHX_
 201 #define aPTBL  aTHX
 202 #define aPTBL_ aTHX_
 203
 204 #include "ptable.h"
 205
 206 #define ptable_store(T, K, V) ptable_store(aTHX_ (T), (K), (V))
 207 #define ptable_delete(T, K)   ptable_delete(aTHX_ (T), (K))
 208 #define ptable_clear(T)       ptable_clear(aTHX_ (T))
 209 #define ptable_free(T)        ptable_free(aTHX_ (T))
 210
 211 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
 212
 213 typedef struct {
 214 #if I_THREADSAFE
 215  ptable *tbl; /* It really is a ptable_hints */
 216  tTHX    owner;
 217 #endif
 218  ptable *map;
 219  SV     *global_code;
 220 } my_cxt_t;
 221
 222 START_MY_CXT
 223
 224 #if I_THREADSAFE
 225
 226 STATIC SV *indirect_clone(pTHX_ SV *sv, tTHX owner) {
 227 #define indirect_clone(S, O) indirect_clone(aTHX_ (S), (O))
 228  CLONE_PARAMS  param;
 229  AV           *stashes = NULL;
 230  SV           *dupsv;
 231
 232  if (!sv)
 233   return NULL;
 234
 235  if (SvTYPE(sv) == SVt_PVHV && HvNAME_get(sv))
 236   stashes = newAV();
 237
 238  param.stashes    = stashes;
 239  param.flags      = 0;
 240  param.proto_perl = owner;
 241
 242  dupsv = sv_dup(sv, &param);
 243
 244  if (stashes) {
 245   av_undef(stashes);
 246   SvREFCNT_dec(stashes);
 247  }
 248
 249  return SvREFCNT_inc(dupsv);
 250 }
 251
 252 STATIC void indirect_ptable_clone(pTHX_ ptable_ent *ent, void *ud_) {
 253  my_cxt_t        *ud = ud_;
 254  indirect_hint_t *h1 = ent->val;
 255  indirect_hint_t *h2;
 256
 257  if (ud->owner == aTHX)
 258   return;
 259
 260 #if I_HINT_STRUCT
 261
 262  h2       = PerlMemShared_malloc(sizeof *h2);
 263  h2->code = indirect_clone(h1->code, ud->owner);
 264 #if I_WORKAROUND_REQUIRE_PROPAGATION
 265  h2->require_tag = PTR2IV(indirect_clone(INT2PTR(SV *, h1->require_tag),
 266                                          ud->owner));
 267 #endif
 268
 269 #else  /*  I_HINT_STRUCT */
 270
 271  h2 = indirect_clone(h1, ud->owner);
 272
 273 #endif /* !I_HINT_STRUCT */
 274
 275  ptable_hints_store(ud->tbl, ent->key, h2);
 276 }
 277
 278 #include "reap.h"
 279
 280 STATIC void indirect_thread_cleanup(pTHX_ void *ud) {
 281  dMY_CXT;
 282
 283  SvREFCNT_dec(MY_CXT.global_code);
 284  ptable_free(MY_CXT.map);
 285  ptable_hints_free(MY_CXT.tbl);
 286 }
 287
 288 #endif /* I_THREADSAFE */
 289
 290 #if I_WORKAROUND_REQUIRE_PROPAGATION
 291 STATIC IV indirect_require_tag(pTHX) {
 292 #define indirect_require_tag() indirect_require_tag(aTHX)
 293  const CV *cv, *outside;
 294
 295  cv = PL_compcv;
 296
 297  if (!cv) {
 298   /* If for some reason the pragma is operational at run-time, try to discover
 299    * the current cv in use. */
 300   const PERL_SI *si;
 301
 302   for (si = PL_curstackinfo; si; si = si->si_prev) {
 303    I32 cxix;
 304
 305    for (cxix = si->si_cxix; cxix >= 0; --cxix) {
 306     const PERL_CONTEXT *cx = si->si_cxstack + cxix;
 307
 308     switch (CxTYPE(cx)) {
 309      case CXt_SUB:
 310      case CXt_FORMAT:
 311       /* The propagation workaround is only needed up to 5.10.0 and at that
 312        * time format and sub contexts were still identical. And even later the
 313        * cv members offsets should have been kept the same. */
 314       cv = cx->blk_sub.cv;
 315       goto get_enclosing_cv;
 316      case CXt_EVAL:
 317       cv = cx->blk_eval.cv;
 318       goto get_enclosing_cv;
 319      default:
 320       break;
 321     }
 322    }
 323   }
 324
 325   cv = PL_main_cv;
 326  }
 327
 328 get_enclosing_cv:
 329  for (outside = CvOUTSIDE(cv); outside; outside = CvOUTSIDE(cv))
 330   cv = outside;
 331
 332  return PTR2IV(cv);
 333 }
 334 #endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
 335
 336 STATIC SV *indirect_tag(pTHX_ SV *value) {
 337 #define indirect_tag(V) indirect_tag(aTHX_ (V))
 338  indirect_hint_t *h;
 339  SV *code = NULL;
 340
 341  if (SvROK(value)) {
 342   value = SvRV(value);
 343   if (SvTYPE(value) >= SVt_PVCV) {
 344    code = value;
 345    SvREFCNT_inc_simple_void_NN(code);
 346   }
 347  }
 348
 349 #if I_HINT_STRUCT
 350  h = PerlMemShared_malloc(sizeof *h);
 351  h->code        = code;
 352 # if I_WORKAROUND_REQUIRE_PROPAGATION
 353  h->require_tag = indirect_require_tag();
 354 # endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
 355 #else  /*  I_HINT_STRUCT */
 356  h = code;
 357 #endif /* !I_HINT_STRUCT */
 358
 359 #if I_THREADSAFE
 360  {
 361   dMY_CXT;
 362   /* We only need for the key to be an unique tag for looking up the value later
 363    * Allocated memory provides convenient unique identifiers, so that's why we
 364    * use the hint as the key itself. */
 365   ptable_hints_store(MY_CXT.tbl, h, h);
 366  }
 367 #endif /* I_THREADSAFE */
 368
 369  return newSViv(PTR2IV(h));
 370 }
 371
 372 STATIC SV *indirect_detag(pTHX_ const SV *hint) {
 373 #define indirect_detag(H) indirect_detag(aTHX_ (H))
 374  indirect_hint_t *h;
 375 #if I_THREADSAFE || I_WORKAROUND_REQUIRE_PROPAGATION
 376  dMY_CXT;
 377 #endif
 378
 379  h = INT2PTR(indirect_hint_t *, SvIVX(hint));
 380 #if I_THREADSAFE
 381  h = ptable_fetch(MY_CXT.tbl, h);
 382 #endif /* I_THREADSAFE */
 383
 384 #if I_WORKAROUND_REQUIRE_PROPAGATION
 385  if (indirect_require_tag() != h->require_tag)
 386   return MY_CXT.global_code;
 387 #endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
 388
 389  return I_HINT_CODE(h);
 390 }
 391
 392 STATIC U32 indirect_hash = 0;
 393
 394 STATIC SV *indirect_hint(pTHX) {
 395 #define indirect_hint() indirect_hint(aTHX)
 396  SV *hint = NULL;
 397
 398  if (IN_PERL_RUNTIME)
 399   return NULL;
 400
 401 #if I_HAS_PERL(5, 10, 0) || defined(PL_parser)
 402  if (!PL_parser)
 403   return NULL;
 404 #endif
 405
 406 #ifdef cop_hints_fetch_pvn
 407  hint = cop_hints_fetch_pvn(PL_curcop, __PACKAGE__, __PACKAGE_LEN__,
 408                                                               indirect_hash, 0);
 409 #elif I_HAS_PERL(5, 9, 5)
 410  hint = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash,
 411                                        NULL,
 412                                        __PACKAGE__, __PACKAGE_LEN__,
 413                                        0,
 414                                        indirect_hash);
 415 #else
 416  {
 417   SV **val = hv_fetch(GvHV(PL_hintgv), __PACKAGE__, __PACKAGE_LEN__, 0);
 418   if (val)
 419    hint = *val;
 420  }
 421 #endif
 422
 423  if (hint && SvIOK(hint))
 424   return indirect_detag(hint);
 425  else {
 426   dMY_CXT;
 427   return MY_CXT.global_code;
 428  }
 429 }
 430
 431 /* ... op -> source position ............................................... */
 432
 433 STATIC void indirect_map_store(pTHX_ const OP *o, STRLEN pos, SV *sv, line_t line) {
 434 #define indirect_map_store(O, P, N, L) indirect_map_store(aTHX_ (O), (P), (N), (L))
 435  indirect_op_info_t *oi;
 436  const char *s;
 437  STRLEN len;
 438  dMY_CXT;
 439
 440  if (!(oi = ptable_fetch(MY_CXT.map, o))) {
 441   Newx(oi, 1, indirect_op_info_t);
 442   ptable_store(MY_CXT.map, o, oi);
 443   oi->buf  = NULL;
 444   oi->size = 0;
 445  }
 446
 447  if (sv) {
 448   s = SvPV_const(sv, len);
 449  } else {
 450   s   = "{";
 451   len = 1;
 452  }
 453
 454  if (len > oi->size) {
 455   Safefree(oi->buf);
 456   Newx(oi->buf, len, char);
 457   oi->size = len;
 458  }
 459  Copy(s, oi->buf, len, char);
 460
 461  oi->len  = len;
 462  oi->pos  = pos;
 463  oi->line = line;
 464 }
 465
 466 STATIC const indirect_op_info_t *indirect_map_fetch(pTHX_ const OP *o) {
 467 #define indirect_map_fetch(O) indirect_map_fetch(aTHX_ (O))
 468  dMY_CXT;
 469
 470  return ptable_fetch(MY_CXT.map, o);
 471 }
 472
 473 STATIC void indirect_map_delete(pTHX_ const OP *o) {
 474 #define indirect_map_delete(O) indirect_map_delete(aTHX_ (O))
 475  dMY_CXT;
 476
 477  ptable_delete(MY_CXT.map, o);
 478 }
 479
 480 /* --- Check functions ----------------------------------------------------- */
 481
 482 STATIC int indirect_find(pTHX_ SV *sv, const char *s, STRLEN *pos) {
 483 #define indirect_find(N, S, P) indirect_find(aTHX_ (N), (S), (P))
 484  STRLEN len;
 485  const char *p, *r = SvPV_const(sv, len);
 486
 487  if (len >= 1 && *r == '$') {
 488   ++r;
 489   --len;
 490   s = strchr(s, '$');
 491   if (!s)
 492    return 0;
 493  }
 494
 495  p = s;
 496  while (1) {
 497   p = strstr(p, r);
 498   if (!p)
 499    return 0;
 500   if (!isALNUM(p[len]))
 501    break;
 502   /* p points to a word that has r as prefix, skip the rest of the word */
 503   p += len + 1;
 504   while (isALNUM(*p))
 505    ++p;
 506  }
 507
 508  *pos = p - SvPVX_const(PL_linestr);
 509
 510  return 1;
 511 }
 512
 513 /* ... ck_const ............................................................ */
 514
 515 STATIC OP *(*indirect_old_ck_const)(pTHX_ OP *) = 0;
 516
 517 STATIC OP *indirect_ck_const(pTHX_ OP *o) {
 518  o = indirect_old_ck_const(aTHX_ o);
 519
 520  if (indirect_hint()) {
 521   SV *sv = cSVOPo_sv;
 522
 523   if (SvPOK(sv) && (SvTYPE(sv) >= SVt_PV)) {
 524    STRLEN pos;
 525
 526    if (indirect_find(sv, PL_oldbufptr, &pos)) {
 527     indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
 528     return o;
 529    }
 530   }
 531  }
 532
 533  indirect_map_delete(o);
 534  return o;
 535 }
 536
 537 /* ... ck_rv2sv ............................................................ */
 538
 539 STATIC OP *(*indirect_old_ck_rv2sv)(pTHX_ OP *) = 0;
 540
 541 STATIC OP *indirect_ck_rv2sv(pTHX_ OP *o) {
 542  if (indirect_hint()) {
 543   OP *op = cUNOPo->op_first;
 544   SV *sv;
 545   const char *name = NULL;
 546   STRLEN pos, len;
 547   OPCODE type = (OPCODE) op->op_type;
 548
 549   switch (type) {
 550    case OP_GV:
 551    case OP_GVSV: {
 552     GV *gv = cGVOPx_gv(op);
 553     name = GvNAME(gv);
 554     len  = GvNAMELEN(gv);
 555     break;
 556    }
 557    default:
 558     if ((PL_opargs[type] & OA_CLASS_MASK) == OA_SVOP) {
 559      SV *nsv = cSVOPx_sv(op);
 560      if (SvPOK(nsv) && (SvTYPE(nsv) >= SVt_PV))
 561       name = SvPV_const(nsv, len);
 562     }
 563   }
 564   if (!name)
 565    goto done;
 566
 567   sv = sv_2mortal(newSVpvn("$", 1));
 568   sv_catpvn_nomg(sv, name, len);
 569   if (!indirect_find(sv, PL_oldbufptr, &pos)) {
 570    /* If it failed, retry without the current stash */
 571    const char *stash = HvNAME_get(PL_curstash);
 572    STRLEN stashlen = HvNAMELEN_get(PL_curstash);
 573
 574    if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
 575        || name[stashlen] != ':' || name[stashlen+1] != ':') {
 576     /* Failed again ? Try to remove main */
 577     stash = "main";
 578     stashlen = 4;
 579     if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
 580         || name[stashlen] != ':' || name[stashlen+1] != ':')
 581      goto done;
 582    }
 583
 584    sv_setpvn(sv, "$", 1);
 585    stashlen += 2;
 586    sv_catpvn_nomg(sv, name + stashlen, len - stashlen);
 587    if (!indirect_find(sv, PL_oldbufptr, &pos))
 588     goto done;
 589   }
 590
 591   o = indirect_old_ck_rv2sv(aTHX_ o);
 592
 593   indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
 594   return o;
 595  }
 596
 597 done:
 598  o = indirect_old_ck_rv2sv(aTHX_ o);
 599
 600  indirect_map_delete(o);
 601  return o;
 602 }
 603
 604 /* ... ck_padany ........................................................... */
 605
 606 STATIC OP *(*indirect_old_ck_padany)(pTHX_ OP *) = 0;
 607
 608 STATIC OP *indirect_ck_padany(pTHX_ OP *o) {
 609  o = indirect_old_ck_padany(aTHX_ o);
 610
 611  if (indirect_hint()) {
 612   SV *sv;
 613   const char *s = PL_oldbufptr, *t = PL_bufptr - 1;
 614
 615   while (s < t && isSPACE(*s)) ++s;
 616   if (*s == '$' && ++s <= t) {
 617    while (s < t && isSPACE(*s)) ++s;
 618    while (s < t && isSPACE(*t)) --t;
 619    sv = sv_2mortal(newSVpvn("$", 1));
 620    sv_catpvn_nomg(sv, s, t - s + 1);
 621    indirect_map_store(o, s - SvPVX_const(PL_linestr),
 622                          sv, CopLINE(&PL_compiling));
 623    return o;
 624   }
 625  }
 626
 627  indirect_map_delete(o);
 628  return o;
 629 }
 630
 631 /* ... ck_scope ............................................................ */
 632
 633 STATIC OP *(*indirect_old_ck_scope)  (pTHX_ OP *) = 0;
 634 STATIC OP *(*indirect_old_ck_lineseq)(pTHX_ OP *) = 0;
 635
 636 STATIC OP *indirect_ck_scope(pTHX_ OP *o) {
 637  OP *(*old_ck)(pTHX_ OP *) = 0;
 638
 639  switch (o->op_type) {
 640   case OP_SCOPE:   old_ck = indirect_old_ck_scope;   break;
 641   case OP_LINESEQ: old_ck = indirect_old_ck_lineseq; break;
 642  }
 643  o = old_ck(aTHX_ o);
 644
 645  if (indirect_hint()) {
 646   indirect_map_store(o, PL_oldbufptr - SvPVX_const(PL_linestr),
 647                         NULL, CopLINE(&PL_compiling));
 648   return o;
 649  }
 650
 651  indirect_map_delete(o);
 652  return o;
 653 }
 654
 655 /* We don't need to clean the map entries for leave ops because they can only
 656  * be created by mutating from a lineseq. */
 657
 658 /* ... ck_method ........................................................... */
 659
 660 STATIC OP *(*indirect_old_ck_method)(pTHX_ OP *) = 0;
 661
 662 STATIC OP *indirect_ck_method(pTHX_ OP *o) {
 663  if (indirect_hint()) {
 664   OP *op = cUNOPo->op_first;
 665
 666   /* Indirect method call is only possible when the method is a bareword, so
 667    * don't trip up on $obj->$meth. */
 668   if (op && op->op_type == OP_CONST) {
 669    const indirect_op_info_t *oi = indirect_map_fetch(op);
 670    STRLEN pos;
 671    line_t line;
 672    SV *sv;
 673
 674    if (!oi)
 675     goto done;
 676
 677    sv   = sv_2mortal(newSVpvn(oi->buf, oi->len));
 678    pos  = oi->pos;
 679    /* Keep the old line so that we really point to the first line of the
 680     * expression. */
 681    line = oi->line;
 682
 683    o = indirect_old_ck_method(aTHX_ o);
 684    /* o may now be a method_named */
 685
 686    indirect_map_store(o, pos, sv, line);
 687    return o;
 688   }
 689  }
 690
 691 done:
 692  o = indirect_old_ck_method(aTHX_ o);
 693
 694  indirect_map_delete(o);
 695  return o;
 696 }
 697
 698 /* ... ck_method_named ..................................................... */
 699
 700 /* "use foo/no foo" compiles its call to import/unimport directly to a
 701  * method_named op. */
 702
 703 STATIC OP *(*indirect_old_ck_method_named)(pTHX_ OP *) = 0;
 704
 705 STATIC OP *indirect_ck_method_named(pTHX_ OP *o) {
 706  if (indirect_hint()) {
 707   STRLEN pos;
 708   line_t line;
 709   SV *sv;
 710
 711   sv = cSVOPo_sv;
 712   if (!SvPOK(sv) || (SvTYPE(sv) < SVt_PV))
 713    goto done;
 714   sv = sv_mortalcopy(sv);
 715
 716   if (!indirect_find(sv, PL_oldbufptr, &pos))
 717    goto done;
 718   line = CopLINE(&PL_compiling);
 719
 720   o = indirect_old_ck_method_named(aTHX_ o);
 721
 722   indirect_map_store(o, pos, sv, line);
 723   return o;
 724  }
 725
 726 done:
 727  o = indirect_old_ck_method_named(aTHX_ o);
 728
 729  indirect_map_delete(o);
 730  return o;
 731 }
 732
 733 /* ... ck_entersub ......................................................... */
 734
 735 STATIC OP *(*indirect_old_ck_entersub)(pTHX_ OP *) = 0;
 736
 737 STATIC OP *indirect_ck_entersub(pTHX_ OP *o) {
 738  SV *code = indirect_hint();
 739
 740  o = indirect_old_ck_entersub(aTHX_ o);
 741
 742  if (code) {
 743   const indirect_op_info_t *moi, *ooi;
 744   OP     *mop, *oop;
 745   LISTOP *lop;
 746
 747   oop = o;
 748   do {
 749    lop = (LISTOP *) oop;
 750    if (!(lop->op_flags & OPf_KIDS))
 751     goto done;
 752    oop = lop->op_first;
 753   } while (oop->op_type != OP_PUSHMARK);
 754   oop = oop->op_sibling;
 755   mop = lop->op_last;
 756
 757   if (!oop)
 758    goto done;
 759
 760   switch (oop->op_type) {
 761    case OP_CONST:
 762    case OP_RV2SV:
 763    case OP_PADSV:
 764    case OP_SCOPE:
 765    case OP_LEAVE:
 766     break;
 767    default:
 768     goto done;
 769   }
 770
 771   if (mop->op_type == OP_METHOD)
 772    mop = cUNOPx(mop)->op_first;
 773   else if (mop->op_type != OP_METHOD_NAMED)
 774    goto done;
 775
 776   moi = indirect_map_fetch(mop);
 777   if (!moi)
 778    goto done;
 779
 780   ooi = indirect_map_fetch(oop);
 781   if (!ooi)
 782    goto done;
 783
 784   /* When positions are identical, the method and the object must have the
 785    * same name. But it also means that it is an indirect call, as "foo->foo"
 786    * results in different positions. */
 787   if (moi->pos <= ooi->pos) {
 788    SV *file;
 789    dSP;
 790
 791    ENTER;
 792    SAVETMPS;
 793
 794 #ifdef USE_ITHREADS
 795    file = sv_2mortal(newSVpv(CopFILE(&PL_compiling), 0));
 796 #else
 797    file = sv_mortalcopy(CopFILESV(&PL_compiling));
 798 #endif
 799
 800    PUSHMARK(SP);
 801    EXTEND(SP, 4);
 802    mPUSHp(ooi->buf, ooi->len);
 803    mPUSHp(moi->buf, moi->len);
 804    PUSHs(file);
 805    mPUSHu(moi->line);
 806    PUTBACK;
 807
 808    call_sv(code, G_VOID);
 809
 810    PUTBACK;
 811
 812    FREETMPS;
 813    LEAVE;
 814   }
 815  }
 816
 817 done:
 818  return o;
 819 }
 820
 821 STATIC U32 indirect_initialized = 0;
 822
 823 STATIC void indirect_teardown(pTHX_ void *root) {
 824  if (!indirect_initialized)
 825   return;
 826
 827 #if I_MULTIPLICITY
 828  if (aTHX != root)
 829   return;
 830 #endif
 831
 832  {
 833   dMY_CXT;
 834   ptable_free(MY_CXT.map);
 835 #if I_THREADSAFE
 836   ptable_hints_free(MY_CXT.tbl);
 837 #endif
 838  }
 839
 840  PL_check[OP_CONST]           = MEMBER_TO_FPTR(indirect_old_ck_const);
 841  indirect_old_ck_const        = 0;
 842  PL_check[OP_RV2SV]           = MEMBER_TO_FPTR(indirect_old_ck_rv2sv);
 843  indirect_old_ck_rv2sv        = 0;
 844  PL_check[OP_PADANY]          = MEMBER_TO_FPTR(indirect_old_ck_padany);
 845  indirect_old_ck_padany       = 0;
 846  PL_check[OP_SCOPE]           = MEMBER_TO_FPTR(indirect_old_ck_scope);
 847  indirect_old_ck_scope        = 0;
 848  PL_check[OP_LINESEQ]         = MEMBER_TO_FPTR(indirect_old_ck_lineseq);
 849  indirect_old_ck_lineseq      = 0;
 850
 851  PL_check[OP_METHOD]          = MEMBER_TO_FPTR(indirect_old_ck_method);
 852  indirect_old_ck_method       = 0;
 853  PL_check[OP_METHOD_NAMED]    = MEMBER_TO_FPTR(indirect_old_ck_method_named);
 854  indirect_old_ck_method_named = 0;
 855  PL_check[OP_ENTERSUB]        = MEMBER_TO_FPTR(indirect_old_ck_entersub);
 856  indirect_old_ck_entersub     = 0;
 857
 858  indirect_initialized = 0;
 859 }
 860
 861 STATIC void indirect_setup(pTHX) {
 862 #define indirect_setup() indirect_setup(aTHX)
 863  if (indirect_initialized)
 864   return;
 865
 866  {
 867   MY_CXT_INIT;
 868 #if I_THREADSAFE
 869   MY_CXT.tbl         = ptable_new();
 870   MY_CXT.owner       = aTHX;
 871 #endif
 872   MY_CXT.map         = ptable_new();
 873   MY_CXT.global_code = NULL;
 874  }
 875
 876  indirect_old_ck_const        = PL_check[OP_CONST];
 877  PL_check[OP_CONST]           = MEMBER_TO_FPTR(indirect_ck_const);
 878  indirect_old_ck_rv2sv        = PL_check[OP_RV2SV];
 879  PL_check[OP_RV2SV]           = MEMBER_TO_FPTR(indirect_ck_rv2sv);
 880  indirect_old_ck_padany       = PL_check[OP_PADANY];
 881  PL_check[OP_PADANY]          = MEMBER_TO_FPTR(indirect_ck_padany);
 882  indirect_old_ck_scope        = PL_check[OP_SCOPE];
 883  PL_check[OP_SCOPE]           = MEMBER_TO_FPTR(indirect_ck_scope);
 884  indirect_old_ck_lineseq      = PL_check[OP_LINESEQ];
 885  PL_check[OP_LINESEQ]         = MEMBER_TO_FPTR(indirect_ck_scope);
 886
 887  indirect_old_ck_method       = PL_check[OP_METHOD];
 888  PL_check[OP_METHOD]          = MEMBER_TO_FPTR(indirect_ck_method);
 889  indirect_old_ck_method_named = PL_check[OP_METHOD_NAMED];
 890  PL_check[OP_METHOD_NAMED]    = MEMBER_TO_FPTR(indirect_ck_method_named);
 891  indirect_old_ck_entersub     = PL_check[OP_ENTERSUB];
 892  PL_check[OP_ENTERSUB]        = MEMBER_TO_FPTR(indirect_ck_entersub);
 893
 894 #if I_MULTIPLICITY
 895  call_atexit(indirect_teardown, aTHX);
 896 #else
 897  call_atexit(indirect_teardown, NULL);
 898 #endif
 899
 900  indirect_initialized = 1;
 901 }
 902
 903 STATIC U32 indirect_booted = 0;
 904
 905 /* --- XS ------------------------------------------------------------------ */
 906
 907 MODULE = indirect      PACKAGE = indirect
 908
 909 PROTOTYPES: ENABLE
 910
 911 BOOT:
 912 {
 913  if (!indirect_booted++) {
 914   HV *stash;
 915
 916   PERL_HASH(indirect_hash, __PACKAGE__, __PACKAGE_LEN__);
 917
 918   stash = gv_stashpvn(__PACKAGE__, __PACKAGE_LEN__, 1);
 919   newCONSTSUB(stash, "I_THREADSAFE", newSVuv(I_THREADSAFE));
 920   newCONSTSUB(stash, "I_FORKSAFE",   newSVuv(I_FORKSAFE));
 921  }
 922
 923  indirect_setup();
 924 }
 925
 926 #if I_THREADSAFE
 927
 928 void
 929 CLONE(...)
 930 PROTOTYPE: DISABLE
 931 PREINIT:
 932  ptable *t;
 933  SV     *global_code_dup;
 934 PPCODE:
 935  {
 936   my_cxt_t ud;
 937   dMY_CXT;
 938   ud.tbl   = t = ptable_new();
 939   ud.owner = MY_CXT.owner;
 940   ptable_walk(MY_CXT.tbl, indirect_ptable_clone, &ud);
 941   global_code_dup = indirect_clone(MY_CXT.global_code, MY_CXT.owner);
 942  }
 943  {
 944   MY_CXT_CLONE;
 945   MY_CXT.map         = ptable_new();
 946   MY_CXT.tbl         = t;
 947   MY_CXT.owner       = aTHX;
 948   MY_CXT.global_code = global_code_dup;
 949  }
 950  reap(3, indirect_thread_cleanup, NULL);
 951  XSRETURN(0);
 952
 953 #endif
 954
 955 SV *
 956 _tag(SV *value)
 957 PROTOTYPE: $
 958 CODE:
 959  RETVAL = indirect_tag(value);
 960 OUTPUT:
 961  RETVAL
 962
 963 void
 964 _global(SV *code)
 965 PROTOTYPE: $
 966 PPCODE:
 967  if (!SvOK(code))
 968   code = NULL;
 969  else if (SvROK(code))
 970   code = SvRV(code);
 971  {
 972   dMY_CXT;
 973   SvREFCNT_dec(MY_CXT.global_code);
 974   MY_CXT.global_code = SvREFCNT_inc(code);
 975  }
 976  XSRETURN(0);