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 #ifndef SvPV_const
  10 # define SvPV_const SvPV
  11 #endif
  12
  13 #ifndef SvPV_nolen_const
  14 # define SvPV_nolen_const SvPV_nolen
  15 #endif
  16
  17 #ifndef SvPVX_const
  18 # define SvPVX_const SvPVX
  19 #endif
  20
  21 /* ... Hints ............................................................... */
  22
  23 STATIC U32 indirect_hash = 0;
  24
  25 STATIC IV indirect_hint(pTHX) {
  26 #define indirect_hint() indirect_hint(aTHX)
  27  SV *id = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash,
  28                                          NULL,
  29                                          "indirect", 8,
  30                                          0,
  31                                          indirect_hash);
  32  return (id && SvOK(id) && SvIOK(id)) ? SvIV(id) : 0;
  33 }
  34
  35 /* ... op -> source position ............................................... */
  36
  37 STATIC HV *indirect_map = NULL;
  38 STATIC const char *indirect_linestr = NULL;
  39
  40 #define OP2STR(O) (sprintf(buf, "%u", PTR2UV(o)))
  41
  42 STATIC void indirect_map_store(pTHX_ const OP *o, const char *src, SV *sv) {
  43 #define indirect_map_store(O, S, N) indirect_map_store(aTHX_ (O), (S), (N))
  44  char buf[32];
  45  const char *pl_linestr;
  46  SV *val;
  47
  48  /* When lex_inwhat is set, we're in a quotelike environment (qq, qr, but not q)
  49   * In this case the linestr has temporarly changed, but the old buffer should
  50   * still be alive somewhere. */
  51
  52  if (!PL_parser->lex_inwhat) {
  53   pl_linestr = SvPVX_const(PL_parser->linestr);
  54   if (indirect_linestr != pl_linestr) {
  55    hv_clear(indirect_map);
  56    indirect_linestr = pl_linestr;
  57   }
  58  }
  59
  60  val = newSVsv(sv);
  61  SvUPGRADE(val, SVt_PVIV);
  62  SvUVX(val) = PTR2UV(src);
  63  SvIOK_on(val);
  64  SvIsUV_on(val);
  65  if (!hv_store(indirect_map, buf, OP2STR(o), val, 0))
  66   SvREFCNT_dec(val);
  67 }
  68
  69 STATIC const char *indirect_map_fetch(pTHX_ const OP *o, SV ** const name) {
  70 #define indirect_map_fetch(O, S) indirect_map_fetch(aTHX_ (O), (S))
  71  char buf[32];
  72  SV **val;
  73
  74  if (indirect_linestr != SvPVX_const(PL_parser->linestr))
  75   return NULL;
  76
  77  val = hv_fetch(indirect_map, buf, OP2STR(o), 0);
  78  if (!val) {
  79   *name = NULL;
  80   return NULL;
  81  }
  82
  83  *name = *val;
  84  return INT2PTR(const char *, SvUVX(*val));
  85 }
  86
  87 STATIC void indirect_map_delete(pTHX_ const OP *o) {
  88 #define indirect_map_delete(O) indirect_map_delete(aTHX_ (O))
  89  char buf[32];
  90  SV *val;
  91
  92  hv_delete(indirect_map, buf, OP2STR(o), G_DISCARD);
  93 }
  94
  95 STATIC void indirect_map_clean(pTHX_ const OP *o) {
  96 #define indirect_map_clean(O) indirect_map_clean(aTHX_ (O))
  97  if (o->op_flags & OPf_KIDS) {
  98   const OP *kid = cUNOPo->op_first;
  99   for (; kid; kid = kid->op_sibling) {
 100    indirect_map_delete(kid);
 101    indirect_map_clean(kid);
 102   }
 103  } else {
 104   indirect_map_delete(o);
 105  }
 106 }
 107
 108 STATIC const char *indirect_find(pTHX_ SV *sv, const char *s) {
 109 #define indirect_find(N, S) indirect_find(aTHX_ (N), (S))
 110  STRLEN len;
 111  const char *p = NULL, *r = SvPV_const(sv, len);
 112
 113  if (!len)
 114   return s;
 115
 116  p = strstr(s, r);
 117  while (p) {
 118   p += len;
 119   if (!isALNUM(*p))
 120    break;
 121   p = strstr(p + 1, r);
 122  }
 123
 124  return p;
 125 }
 126
 127 /* ... ck_const ............................................................ */
 128
 129 STATIC OP *(*indirect_old_ck_const)(pTHX_ OP *) = 0;
 130
 131 STATIC OP *indirect_ck_const(pTHX_ OP *o) {
 132  o = CALL_FPTR(indirect_old_ck_const)(aTHX_ o);
 133
 134  if (indirect_hint()) {
 135   SV *sv = cSVOPo_sv;
 136   if (SvPOK(sv) && (SvTYPE(sv) >= SVt_PV))
 137    indirect_map_store(o, indirect_find(sv, PL_parser->oldbufptr), sv);
 138  }
 139
 140  return o;
 141 }
 142
 143 /* ... ck_rv2sv ............................................................ */
 144
 145 STATIC OP *(*indirect_old_ck_rv2sv)(pTHX_ OP *) = 0;
 146
 147 STATIC OP *indirect_ck_rv2sv(pTHX_ OP *o) {
 148  if (indirect_hint()) {
 149   OP *op = cUNOPo->op_first;
 150   SV *name = cSVOPx_sv(op);
 151   if (SvPOK(name) && (SvTYPE(name) >= SVt_PV)) {
 152    SV *sv = sv_2mortal(newSVpvn("$", 1));
 153    sv_catsv(sv, name);
 154    indirect_map_store(o, indirect_find(sv, PL_parser->oldbufptr), sv);
 155   }
 156  }
 157
 158  return CALL_FPTR(indirect_old_ck_rv2sv)(aTHX_ o);
 159 }
 160
 161 /* ... ck_padany ........................................................... */
 162
 163 STATIC OP *(*indirect_old_ck_padany)(pTHX_ OP *) = 0;
 164
 165 STATIC OP *indirect_ck_padany(pTHX_ OP *o) {
 166  o = CALL_FPTR(indirect_old_ck_padany)(aTHX_ o);
 167
 168  if (indirect_hint()) {
 169   SV *sv;
 170   const char *s = PL_parser->oldbufptr, *t = PL_parser->bufptr - 1;
 171
 172   while (s < t && isSPACE(*s)) ++s;
 173   while (t > s && isSPACE(*t)) --t;
 174   sv = sv_2mortal(newSVpvn(s, t - s + 1));
 175
 176   indirect_map_store(o, s, sv);
 177  }
 178
 179  return o;
 180 }
 181
 182 /* ... ck_method ........................................................... */
 183
 184 STATIC OP *(*indirect_old_ck_method)(pTHX_ OP *) = 0;
 185
 186 STATIC OP *indirect_ck_method(pTHX_ OP *o) {
 187  if (indirect_hint()) {
 188   OP *op = cUNOPo->op_first;
 189   SV *sv;
 190   const char *s = indirect_map_fetch(op, &sv);
 191   if (!s) {
 192    sv = cSVOPx_sv(op);
 193    if (!SvPOK(sv) || (SvTYPE(sv) < SVt_PV))
 194     goto done;
 195    sv = sv_mortalcopy(sv);
 196    s  = indirect_find(sv, PL_parser->oldbufptr);
 197   }
 198   o = CALL_FPTR(indirect_old_ck_method)(aTHX_ o);
 199   /* o may now be a method_named */
 200   indirect_map_store(o, s, sv);
 201   return o;
 202  }
 203
 204 done:
 205  return CALL_FPTR(indirect_old_ck_method)(aTHX_ o);
 206 }
 207
 208 /* ... ck_entersub ......................................................... */
 209
 210 STATIC const char indirect_msg[] = "Indirect call of method \"%s\" on object \"%s\"";
 211
 212 STATIC OP *(*indirect_old_ck_entersub)(pTHX_ OP *) = 0;
 213
 214 STATIC OP *indirect_ck_entersub(pTHX_ OP *o) {
 215  LISTOP *op;
 216  OP *om, *oo;
 217  IV hint = indirect_hint();
 218
 219  o = CALL_FPTR(indirect_old_ck_entersub)(aTHX_ o);
 220
 221  if (hint) {
 222   const char *pm, *po;
 223   SV *svm, *svo;
 224   oo = o;
 225   do {
 226    op = (LISTOP *) oo;
 227    if (!op->op_flags & OPf_KIDS)
 228     goto done;
 229    oo = op->op_first;
 230   } while (oo->op_type != OP_PUSHMARK);
 231   oo = oo->op_sibling;
 232   om = op->op_last;
 233   if (om->op_type == OP_METHOD)
 234    om = cUNOPx(om)->op_first;
 235   else if (om->op_type != OP_METHOD_NAMED)
 236    goto done;
 237   pm = indirect_map_fetch(om, &svm);
 238   po = indirect_map_fetch(oo, &svo);
 239   if (pm && po && pm < po) {
 240    const char *psvm = SvPV_nolen_const(svm), *psvo = SvPV_nolen_const(svo);
 241    if (hint == 2)
 242     croak(indirect_msg, psvm, psvo);
 243    else
 244     warn(indirect_msg, psvm, psvo);
 245   }
 246 done:
 247   indirect_map_clean(o);
 248  }
 249
 250  return o;
 251 }
 252
 253 STATIC U32 indirect_initialized = 0;
 254
 255 /* --- XS ------------------------------------------------------------------ */
 256
 257 MODULE = indirect      PACKAGE = indirect
 258
 259 PROTOTYPES: DISABLE
 260
 261 BOOT:
 262 {
 263  if (!indirect_initialized++) {
 264   PERL_HASH(indirect_hash, "indirect", 8);
 265   indirect_map = newHV();
 266   indirect_old_ck_const    = PL_check[OP_CONST];
 267   PL_check[OP_CONST]       = MEMBER_TO_FPTR(indirect_ck_const);
 268   indirect_old_ck_rv2sv    = PL_check[OP_RV2SV];
 269   PL_check[OP_RV2SV]       = MEMBER_TO_FPTR(indirect_ck_rv2sv);
 270   indirect_old_ck_padany   = PL_check[OP_PADANY];
 271   PL_check[OP_PADANY]      = MEMBER_TO_FPTR(indirect_ck_padany);
 272   indirect_old_ck_method   = PL_check[OP_METHOD];
 273   PL_check[OP_METHOD]      = MEMBER_TO_FPTR(indirect_ck_method);
 274   indirect_old_ck_entersub = PL_check[OP_ENTERSUB];
 275   PL_check[OP_ENTERSUB]    = MEMBER_TO_FPTR(indirect_ck_entersub);
 276  }
 277 }