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