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  SvREFCNT_inc(h2->code);
 257 #if I_WORKAROUND_REQUIRE_PROPAGATION
 258  h2->require_tag = PTR2IV(indirect_clone(INT2PTR(SV *, h1->require_tag),
 259                                          ud->owner));
 260 #endif
 261
 262 #else  /*  I_HINT_STRUCT */
 263
 264  h2 = indirect_clone(h1, ud->owner);
 265  SvREFCNT_inc(h2);
 266
 267 #endif /* !I_HINT_STRUCT */
 268
 269  ptable_hints_store(ud->tbl, ent->key, h2);
 270 }
 271
 272 #include "reap.h"
 273
 274 STATIC void indirect_thread_cleanup(pTHX_ void *ud) {
 275  dMY_CXT;
 276
 277  ptable_free(MY_CXT.map);
 278  ptable_hints_free(MY_CXT.tbl);
 279 }
 280
 281 #endif /* I_THREADSAFE */
 282
 283 #if I_WORKAROUND_REQUIRE_PROPAGATION
 284 STATIC IV indirect_require_tag(pTHX) {
 285 #define indirect_require_tag() indirect_require_tag(aTHX)
 286  const CV *cv, *outside;
 287
 288  cv = PL_compcv;
 289
 290  if (!cv) {
 291   /* If for some reason the pragma is operational at run-time, try to discover
 292    * the current cv in use. */
 293   const PERL_SI *si;
 294
 295   for (si = PL_curstackinfo; si; si = si->si_prev) {
 296    I32 cxix;
 297
 298    for (cxix = si->si_cxix; cxix >= 0; --cxix) {
 299     const PERL_CONTEXT *cx = si->si_cxstack + cxix;
 300
 301     switch (CxTYPE(cx)) {
 302      case CXt_SUB:
 303      case CXt_FORMAT:
 304       /* The propagation workaround is only needed up to 5.10.0 and at that
 305        * time format and sub contexts were still identical. And even later the
 306        * cv members offsets should have been kept the same. */
 307       cv = cx->blk_sub.cv;
 308       goto get_enclosing_cv;
 309      case CXt_EVAL:
 310       cv = cx->blk_eval.cv;
 311       goto get_enclosing_cv;
 312      default:
 313       break;
 314     }
 315    }
 316   }
 317
 318   cv = PL_main_cv;
 319  }
 320
 321 get_enclosing_cv:
 322  for (outside = CvOUTSIDE(cv); outside; outside = CvOUTSIDE(cv))
 323   cv = outside;
 324
 325  return PTR2IV(cv);
 326 }
 327 #endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
 328
 329 STATIC SV *indirect_tag(pTHX_ SV *value) {
 330 #define indirect_tag(V) indirect_tag(aTHX_ (V))
 331  indirect_hint_t *h;
 332  SV *code = NULL;
 333
 334  if (SvROK(value)) {
 335   value = SvRV(value);
 336   if (SvTYPE(value) >= SVt_PVCV) {
 337    code = value;
 338    SvREFCNT_inc_simple_NN(code);
 339   }
 340  }
 341
 342 #if I_HINT_STRUCT
 343  h = PerlMemShared_malloc(sizeof *h);
 344  h->code        = code;
 345 # if I_WORKAROUND_REQUIRE_PROPAGATION
 346  h->require_tag = indirect_require_tag();
 347 # endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
 348 #else  /*  I_HINT_STRUCT */
 349  h = code;
 350 #endif /* !I_HINT_STRUCT */
 351
 352 #if I_THREADSAFE
 353  {
 354   dMY_CXT;
 355   /* We only need for the key to be an unique tag for looking up the value later
 356    * Allocated memory provides convenient unique identifiers, so that's why we
 357    * use the hint as the key itself. */
 358   ptable_hints_store(MY_CXT.tbl, h, h);
 359  }
 360 #endif /* I_THREADSAFE */
 361
 362  return newSViv(PTR2IV(h));
 363 }
 364
 365 STATIC SV *indirect_detag(pTHX_ const SV *hint) {
 366 #define indirect_detag(H) indirect_detag(aTHX_ (H))
 367  indirect_hint_t *h;
 368
 369  if (!(hint && SvIOK(hint)))
 370   return NULL;
 371
 372  h = INT2PTR(indirect_hint_t *, SvIVX(hint));
 373 #if I_THREADSAFE
 374  {
 375   dMY_CXT;
 376   h = ptable_fetch(MY_CXT.tbl, h);
 377  }
 378 #endif /* I_THREADSAFE */
 379
 380 #if I_WORKAROUND_REQUIRE_PROPAGATION
 381  if (indirect_require_tag() != h->require_tag)
 382   return NULL;
 383 #endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
 384
 385  return I_HINT_CODE(h);
 386 }
 387
 388 STATIC U32 indirect_hash = 0;
 389
 390 STATIC SV *indirect_hint(pTHX) {
 391 #define indirect_hint() indirect_hint(aTHX)
 392  SV *hint;
 393
 394  if (IN_PERL_RUNTIME)
 395   return NULL;
 396
 397 #ifdef cop_hints_fetch_pvn
 398  hint = cop_hints_fetch_pvn(PL_curcop, __PACKAGE__, __PACKAGE_LEN__,
 399                                                               indirect_hash, 0);
 400 #elif I_HAS_PERL(5, 9, 5)
 401  hint = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash,
 402                                        NULL,
 403                                        __PACKAGE__, __PACKAGE_LEN__,
 404                                        0,
 405                                        indirect_hash);
 406 #else
 407  {
 408   SV **val = hv_fetch(GvHV(PL_hintgv), __PACKAGE__, __PACKAGE_LEN__,
 409                                                                  indirect_hash);
 410   if (!val)
 411    return 0;
 412   hint = *val;
 413  }
 414 #endif
 415
 416  return indirect_detag(hint);
 417 }
 418
 419 /* ... op -> source position ............................................... */
 420
 421 STATIC void indirect_map_store(pTHX_ const OP *o, STRLEN pos, SV *sv, line_t line) {
 422 #define indirect_map_store(O, P, N, L) indirect_map_store(aTHX_ (O), (P), (N), (L))
 423  indirect_op_info_t *oi;
 424  const char *s;
 425  STRLEN len;
 426  dMY_CXT;
 427
 428  if (!(oi = ptable_fetch(MY_CXT.map, o))) {
 429   Newx(oi, 1, indirect_op_info_t);
 430   ptable_store(MY_CXT.map, o, oi);
 431   oi->buf  = NULL;
 432   oi->size = 0;
 433  }
 434
 435  if (sv) {
 436   s = SvPV_const(sv, len);
 437  } else {
 438   s   = "{";
 439   len = 1;
 440  }
 441
 442  if (len > oi->size) {
 443   Safefree(oi->buf);
 444   Newx(oi->buf, len, char);
 445   oi->size = len;
 446  }
 447  Copy(s, oi->buf, len, char);
 448
 449  oi->len  = len;
 450  oi->pos  = pos;
 451  oi->line = line;
 452 }
 453
 454 STATIC const indirect_op_info_t *indirect_map_fetch(pTHX_ const OP *o) {
 455 #define indirect_map_fetch(O) indirect_map_fetch(aTHX_ (O))
 456  dMY_CXT;
 457
 458  return ptable_fetch(MY_CXT.map, o);
 459 }
 460
 461 STATIC void indirect_map_delete(pTHX_ const OP *o) {
 462 #define indirect_map_delete(O) indirect_map_delete(aTHX_ (O))
 463  dMY_CXT;
 464
 465  ptable_delete(MY_CXT.map, o);
 466 }
 467
 468 /* --- Check functions ----------------------------------------------------- */
 469
 470 STATIC int indirect_find(pTHX_ SV *sv, const char *s, STRLEN *pos) {
 471 #define indirect_find(N, S, P) indirect_find(aTHX_ (N), (S), (P))
 472  STRLEN len;
 473  const char *p, *r = SvPV_const(sv, len);
 474
 475  if (len >= 1 && *r == '$') {
 476   ++r;
 477   --len;
 478   s = strchr(s, '$');
 479   if (!s)
 480    return 0;
 481  }
 482
 483  p = s;
 484  while (1) {
 485   p = strstr(p, r);
 486   if (!p)
 487    return 0;
 488   if (!isALNUM(p[len]))
 489    break;
 490   /* p points to a word that has r as prefix, skip the rest of the word */
 491   p += len + 1;
 492   while (isALNUM(*p))
 493    ++p;
 494  }
 495
 496  *pos = p - SvPVX_const(PL_linestr);
 497
 498  return 1;
 499 }
 500
 501 /* ... ck_const ............................................................ */
 502
 503 STATIC OP *(*indirect_old_ck_const)(pTHX_ OP *) = 0;
 504
 505 STATIC OP *indirect_ck_const(pTHX_ OP *o) {
 506  o = indirect_old_ck_const(aTHX_ o);
 507
 508  if (indirect_hint()) {
 509   SV *sv = cSVOPo_sv;
 510
 511   if (SvPOK(sv) && (SvTYPE(sv) >= SVt_PV)) {
 512    STRLEN pos;
 513
 514    if (indirect_find(sv, PL_oldbufptr, &pos)) {
 515     indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
 516     return o;
 517    }
 518   }
 519  }
 520
 521  indirect_map_delete(o);
 522  return o;
 523 }
 524
 525 /* ... ck_rv2sv ............................................................ */
 526
 527 STATIC OP *(*indirect_old_ck_rv2sv)(pTHX_ OP *) = 0;
 528
 529 STATIC OP *indirect_ck_rv2sv(pTHX_ OP *o) {
 530  if (indirect_hint()) {
 531   OP *op = cUNOPo->op_first;
 532   SV *sv;
 533   const char *name = NULL;
 534   STRLEN pos, len;
 535   OPCODE type = (OPCODE) op->op_type;
 536
 537   switch (type) {
 538    case OP_GV:
 539    case OP_GVSV: {
 540     GV *gv = cGVOPx_gv(op);
 541     name = GvNAME(gv);
 542     len  = GvNAMELEN(gv);
 543     break;
 544    }
 545    default:
 546     if ((PL_opargs[type] & OA_CLASS_MASK) == OA_SVOP) {
 547      SV *nsv = cSVOPx_sv(op);
 548      if (SvPOK(nsv) && (SvTYPE(nsv) >= SVt_PV))
 549       name = SvPV_const(nsv, len);
 550     }
 551   }
 552   if (!name)
 553    goto done;
 554
 555   sv = sv_2mortal(newSVpvn("$", 1));
 556   sv_catpvn_nomg(sv, name, len);
 557   if (!indirect_find(sv, PL_oldbufptr, &pos)) {
 558    /* If it failed, retry without the current stash */
 559    const char *stash = HvNAME_get(PL_curstash);
 560    STRLEN stashlen = HvNAMELEN_get(PL_curstash);
 561
 562    if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
 563        || name[stashlen] != ':' || name[stashlen+1] != ':') {
 564     /* Failed again ? Try to remove main */
 565     stash = "main";
 566     stashlen = 4;
 567     if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
 568         || name[stashlen] != ':' || name[stashlen+1] != ':')
 569      goto done;
 570    }
 571
 572    sv_setpvn(sv, "$", 1);
 573    stashlen += 2;
 574    sv_catpvn_nomg(sv, name + stashlen, len - stashlen);
 575    if (!indirect_find(sv, PL_oldbufptr, &pos))
 576     goto done;
 577   }
 578
 579   o = indirect_old_ck_rv2sv(aTHX_ o);
 580
 581   indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
 582   return o;
 583  }
 584
 585 done:
 586  o = indirect_old_ck_rv2sv(aTHX_ o);
 587
 588  indirect_map_delete(o);
 589  return o;
 590 }
 591
 592 /* ... ck_padany ........................................................... */
 593
 594 STATIC OP *(*indirect_old_ck_padany)(pTHX_ OP *) = 0;
 595
 596 STATIC OP *indirect_ck_padany(pTHX_ OP *o) {
 597  o = indirect_old_ck_padany(aTHX_ o);
 598
 599  if (indirect_hint()) {
 600   SV *sv;
 601   const char *s = PL_oldbufptr, *t = PL_bufptr - 1;
 602
 603   while (s < t && isSPACE(*s)) ++s;
 604   if (*s == '$' && ++s <= t) {
 605    while (s < t && isSPACE(*s)) ++s;
 606    while (s < t && isSPACE(*t)) --t;
 607    sv = sv_2mortal(newSVpvn("$", 1));
 608    sv_catpvn_nomg(sv, s, t - s + 1);
 609    indirect_map_store(o, s - SvPVX_const(PL_linestr),
 610                          sv, CopLINE(&PL_compiling));
 611    return o;
 612   }
 613  }
 614
 615  indirect_map_delete(o);
 616  return o;
 617 }
 618
 619 /* ... ck_scope ............................................................ */
 620
 621 STATIC OP *(*indirect_old_ck_scope)  (pTHX_ OP *) = 0;
 622 STATIC OP *(*indirect_old_ck_lineseq)(pTHX_ OP *) = 0;
 623
 624 STATIC OP *indirect_ck_scope(pTHX_ OP *o) {
 625  OP *(*old_ck)(pTHX_ OP *) = 0;
 626
 627  switch (o->op_type) {
 628   case OP_SCOPE:   old_ck = indirect_old_ck_scope;   break;
 629   case OP_LINESEQ: old_ck = indirect_old_ck_lineseq; break;
 630  }
 631  o = old_ck(aTHX_ o);
 632
 633  if (indirect_hint()) {
 634   indirect_map_store(o, PL_oldbufptr - SvPVX_const(PL_linestr),
 635                         NULL, CopLINE(&PL_compiling));
 636   return o;
 637  }
 638
 639  indirect_map_delete(o);
 640  return o;
 641 }
 642
 643 /* We don't need to clean the map entries for leave ops because they can only
 644  * be created by mutating from a lineseq. */
 645
 646 /* ... ck_method ........................................................... */
 647
 648 STATIC OP *(*indirect_old_ck_method)(pTHX_ OP *) = 0;
 649
 650 STATIC OP *indirect_ck_method(pTHX_ OP *o) {
 651  if (indirect_hint()) {
 652   OP *op = cUNOPo->op_first;
 653
 654   /* Indirect method call is only possible when the method is a bareword, so
 655    * don't trip up on $obj->$meth. */
 656   if (op && op->op_type == OP_CONST) {
 657    const indirect_op_info_t *oi = indirect_map_fetch(op);
 658    STRLEN pos;
 659    line_t line;
 660    SV *sv;
 661
 662    if (!oi)
 663     goto done;
 664
 665    sv   = sv_2mortal(newSVpvn(oi->buf, oi->len));
 666    pos  = oi->pos;
 667    /* Keep the old line so that we really point to the first line of the
 668     * expression. */
 669    line = oi->line;
 670
 671    o = indirect_old_ck_method(aTHX_ o);
 672    /* o may now be a method_named */
 673
 674    indirect_map_store(o, pos, sv, line);
 675    return o;
 676   }
 677  }
 678
 679 done:
 680  o = indirect_old_ck_method(aTHX_ o);
 681
 682  indirect_map_delete(o);
 683  return o;
 684 }
 685
 686 /* ... ck_method_named ..................................................... */
 687
 688 /* "use foo/no foo" compiles its call to import/unimport directly to a
 689  * method_named op. */
 690
 691 STATIC OP *(*indirect_old_ck_method_named)(pTHX_ OP *) = 0;
 692
 693 STATIC OP *indirect_ck_method_named(pTHX_ OP *o) {
 694  if (indirect_hint()) {
 695   STRLEN pos;
 696   line_t line;
 697   SV *sv;
 698
 699   sv = cSVOPo_sv;
 700   if (!SvPOK(sv) || (SvTYPE(sv) < SVt_PV))
 701    goto done;
 702   sv = sv_mortalcopy(sv);
 703
 704   if (!indirect_find(sv, PL_oldbufptr, &pos))
 705    goto done;
 706   line = CopLINE(&PL_compiling);
 707
 708   o = indirect_old_ck_method_named(aTHX_ o);
 709
 710   indirect_map_store(o, pos, sv, line);
 711   return o;
 712  }
 713
 714 done:
 715  o = indirect_old_ck_method_named(aTHX_ o);
 716
 717  indirect_map_delete(o);
 718  return o;
 719 }
 720
 721 /* ... ck_entersub ......................................................... */
 722
 723 STATIC OP *(*indirect_old_ck_entersub)(pTHX_ OP *) = 0;
 724
 725 STATIC OP *indirect_ck_entersub(pTHX_ OP *o) {
 726  SV *code = indirect_hint();
 727
 728  o = indirect_old_ck_entersub(aTHX_ o);
 729
 730  if (code) {
 731   const indirect_op_info_t *moi, *ooi;
 732   OP     *mop, *oop;
 733   LISTOP *lop;
 734
 735   oop = o;
 736   do {
 737    lop = (LISTOP *) oop;
 738    if (!(lop->op_flags & OPf_KIDS))
 739     goto done;
 740    oop = lop->op_first;
 741   } while (oop->op_type != OP_PUSHMARK);
 742   oop = oop->op_sibling;
 743   mop = lop->op_last;
 744
 745   if (!oop)
 746    goto done;
 747
 748   switch (oop->op_type) {
 749    case OP_CONST:
 750    case OP_RV2SV:
 751    case OP_PADSV:
 752    case OP_SCOPE:
 753    case OP_LEAVE:
 754     break;
 755    default:
 756     goto done;
 757   }
 758
 759   if (mop->op_type == OP_METHOD)
 760    mop = cUNOPx(mop)->op_first;
 761   else if (mop->op_type != OP_METHOD_NAMED)
 762    goto done;
 763
 764   moi = indirect_map_fetch(mop);
 765   if (!moi)
 766    goto done;
 767
 768   ooi = indirect_map_fetch(oop);
 769   if (!ooi)
 770    goto done;
 771
 772   /* When positions are identical, the method and the object must have the
 773    * same name. But it also means that it is an indirect call, as "foo->foo"
 774    * results in different positions. */
 775   if (moi->pos <= ooi->pos) {
 776    SV *file;
 777    dSP;
 778
 779    ENTER;
 780    SAVETMPS;
 781
 782 #ifdef USE_ITHREADS
 783    file = sv_2mortal(newSVpv(CopFILE(&PL_compiling), 0));
 784 #else
 785    file = sv_mortalcopy(CopFILESV(&PL_compiling));
 786 #endif
 787
 788    PUSHMARK(SP);
 789    EXTEND(SP, 4);
 790    mPUSHp(ooi->buf, ooi->len);
 791    mPUSHp(moi->buf, moi->len);
 792    PUSHs(file);
 793    mPUSHu(moi->line);
 794    PUTBACK;
 795
 796    call_sv(code, G_VOID);
 797
 798    PUTBACK;
 799
 800    FREETMPS;
 801    LEAVE;
 802   }
 803  }
 804
 805 done:
 806  return o;
 807 }
 808
 809 STATIC U32 indirect_initialized = 0;
 810
 811 STATIC void indirect_teardown(pTHX_ void *root) {
 812  if (!indirect_initialized)
 813   return;
 814
 815 #if I_MULTIPLICITY
 816  if (aTHX != root)
 817   return;
 818 #endif
 819
 820  {
 821   dMY_CXT;
 822   ptable_free(MY_CXT.map);
 823 #if I_THREADSAFE
 824   ptable_hints_free(MY_CXT.tbl);
 825 #endif
 826  }
 827
 828  PL_check[OP_CONST]           = MEMBER_TO_FPTR(indirect_old_ck_const);
 829  indirect_old_ck_const        = 0;
 830  PL_check[OP_RV2SV]           = MEMBER_TO_FPTR(indirect_old_ck_rv2sv);
 831  indirect_old_ck_rv2sv        = 0;
 832  PL_check[OP_PADANY]          = MEMBER_TO_FPTR(indirect_old_ck_padany);
 833  indirect_old_ck_padany       = 0;
 834  PL_check[OP_SCOPE]           = MEMBER_TO_FPTR(indirect_old_ck_scope);
 835  indirect_old_ck_scope        = 0;
 836  PL_check[OP_LINESEQ]         = MEMBER_TO_FPTR(indirect_old_ck_lineseq);
 837  indirect_old_ck_lineseq      = 0;
 838
 839  PL_check[OP_METHOD]          = MEMBER_TO_FPTR(indirect_old_ck_method);
 840  indirect_old_ck_method       = 0;
 841  PL_check[OP_METHOD_NAMED]    = MEMBER_TO_FPTR(indirect_old_ck_method_named);
 842  indirect_old_ck_method_named = 0;
 843  PL_check[OP_ENTERSUB]        = MEMBER_TO_FPTR(indirect_old_ck_entersub);
 844  indirect_old_ck_entersub     = 0;
 845
 846  indirect_initialized = 0;
 847 }
 848
 849 STATIC void indirect_setup(pTHX) {
 850 #define indirect_setup() indirect_setup(aTHX)
 851  if (indirect_initialized)
 852   return;
 853
 854  {
 855   MY_CXT_INIT;
 856 #if I_THREADSAFE
 857   MY_CXT.tbl   = ptable_new();
 858   MY_CXT.owner = aTHX;
 859 #endif
 860   MY_CXT.map   = ptable_new();
 861  }
 862
 863  indirect_old_ck_const        = PL_check[OP_CONST];
 864  PL_check[OP_CONST]           = MEMBER_TO_FPTR(indirect_ck_const);
 865  indirect_old_ck_rv2sv        = PL_check[OP_RV2SV];
 866  PL_check[OP_RV2SV]           = MEMBER_TO_FPTR(indirect_ck_rv2sv);
 867  indirect_old_ck_padany       = PL_check[OP_PADANY];
 868  PL_check[OP_PADANY]          = MEMBER_TO_FPTR(indirect_ck_padany);
 869  indirect_old_ck_scope        = PL_check[OP_SCOPE];
 870  PL_check[OP_SCOPE]           = MEMBER_TO_FPTR(indirect_ck_scope);
 871  indirect_old_ck_lineseq      = PL_check[OP_LINESEQ];
 872  PL_check[OP_LINESEQ]         = MEMBER_TO_FPTR(indirect_ck_scope);
 873
 874  indirect_old_ck_method       = PL_check[OP_METHOD];
 875  PL_check[OP_METHOD]          = MEMBER_TO_FPTR(indirect_ck_method);
 876  indirect_old_ck_method_named = PL_check[OP_METHOD_NAMED];
 877  PL_check[OP_METHOD_NAMED]    = MEMBER_TO_FPTR(indirect_ck_method_named);
 878  indirect_old_ck_entersub     = PL_check[OP_ENTERSUB];
 879  PL_check[OP_ENTERSUB]        = MEMBER_TO_FPTR(indirect_ck_entersub);
 880
 881 #if I_MULTIPLICITY
 882  call_atexit(indirect_teardown, aTHX);
 883 #else
 884  call_atexit(indirect_teardown, NULL);
 885 #endif
 886
 887  indirect_initialized = 1;
 888 }
 889
 890 STATIC U32 indirect_booted = 0;
 891
 892 /* --- XS ------------------------------------------------------------------ */
 893
 894 MODULE = indirect      PACKAGE = indirect
 895
 896 PROTOTYPES: ENABLE
 897
 898 BOOT:
 899 {
 900  if (!indirect_booted++) {
 901   HV *stash;
 902
 903   PERL_HASH(indirect_hash, __PACKAGE__, __PACKAGE_LEN__);
 904
 905   stash = gv_stashpvn(__PACKAGE__, __PACKAGE_LEN__, 1);
 906   newCONSTSUB(stash, "I_THREADSAFE", newSVuv(I_THREADSAFE));
 907   newCONSTSUB(stash, "I_FORKSAFE",   newSVuv(I_FORKSAFE));
 908  }
 909
 910  indirect_setup();
 911 }
 912
 913 #if I_THREADSAFE
 914
 915 void
 916 CLONE(...)
 917 PROTOTYPE: DISABLE
 918 PREINIT:
 919  ptable *t;
 920 PPCODE:
 921  {
 922   my_cxt_t ud;
 923   dMY_CXT;
 924   ud.tbl   = t = ptable_new();
 925   ud.owner = MY_CXT.owner;
 926   ptable_walk(MY_CXT.tbl, indirect_ptable_clone, &ud);
 927  }
 928  {
 929   MY_CXT_CLONE;
 930   MY_CXT.map   = ptable_new();
 931   MY_CXT.tbl   = t;
 932   MY_CXT.owner = aTHX;
 933  }
 934  reap(3, indirect_thread_cleanup, NULL);
 935  XSRETURN(0);
 936
 937 #endif
 938
 939 SV *
 940 _tag(SV *value)
 941 PROTOTYPE: $
 942 CODE:
 943  RETVAL = indirect_tag(value);
 944 OUTPUT:
 945  RETVAL