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
  91  hv_delete(indirect_map, buf, OP2STR(o), G_DISCARD);
  92 }
  93
  94 STATIC void indirect_map_clean(pTHX_ const OP *o) {
  95 #define indirect_map_clean(O) indirect_map_clean(aTHX_ (O))
  96  if (o->op_flags & OPf_KIDS) {
  97   const OP *kid = cUNOPo->op_first;
  98   for (; kid; kid = kid->op_sibling) {
  99    indirect_map_delete(kid);
 100    indirect_map_clean(kid);
 101   }
 102  } else {
 103   indirect_map_delete(o);
 104  }
 105 }
 106
 107 STATIC const char *indirect_find(pTHX_ SV *sv, const char *s) {
 108 #define indirect_find(N, S) indirect_find(aTHX_ (N), (S))
 109  STRLEN len;
 110  const char *p = NULL, *r = SvPV_const(sv, len);
 111
 112  if (!len)
 113   return s;
 114
 115  p = strstr(s, r);
 116  while (p) {
 117   p += len;
 118   if (!isALNUM(*p))
 119    break;
 120   p = strstr(p + 1, r);
 121  }
 122
 123  return p;
 124 }
 125
 126 /* ... ck_const ............................................................ */
 127
 128 STATIC OP *(*indirect_old_ck_const)(pTHX_ OP *) = 0;
 129
 130 STATIC OP *indirect_ck_const(pTHX_ OP *o) {
 131  o = CALL_FPTR(indirect_old_ck_const)(aTHX_ o);
 132
 133  if (indirect_hint()) {
 134   SV *sv = cSVOPo_sv;
 135   if (SvPOK(sv) && (SvTYPE(sv) >= SVt_PV))
 136    indirect_map_store(o, indirect_find(sv, PL_parser->oldbufptr), sv);
 137  }
 138
 139  return o;
 140 }
 141
 142 /* ... ck_rv2sv ............................................................ */
 143
 144 STATIC OP *(*indirect_old_ck_rv2sv)(pTHX_ OP *) = 0;
 145
 146 STATIC OP *indirect_ck_rv2sv(pTHX_ OP *o) {
 147  if (indirect_hint()) {
 148   OP *op = cUNOPo->op_first;
 149   SV *name = cSVOPx_sv(op);
 150   if (SvPOK(name) && (SvTYPE(name) >= SVt_PV)) {
 151    SV *sv = sv_2mortal(newSVpvn("$", 1));
 152    sv_catsv(sv, name);
 153    o = CALL_FPTR(indirect_old_ck_rv2sv)(aTHX_ o);
 154    indirect_map_store(o, indirect_find(sv, PL_parser->oldbufptr), sv);
 155    return o;
 156   }
 157  }
 158
 159  return CALL_FPTR(indirect_old_ck_rv2sv)(aTHX_ o);
 160 }
 161
 162 /* ... ck_padany ........................................................... */
 163
 164 STATIC OP *(*indirect_old_ck_padany)(pTHX_ OP *) = 0;
 165
 166 STATIC OP *indirect_ck_padany(pTHX_ OP *o) {
 167  o = CALL_FPTR(indirect_old_ck_padany)(aTHX_ o);
 168
 169  if (indirect_hint()) {
 170   SV *sv;
 171   const char *s = PL_parser->oldbufptr, *t = PL_parser->bufptr - 1;
 172
 173   while (s < t && isSPACE(*s)) ++s;
 174   while (t > s && isSPACE(*t)) --t;
 175   sv = sv_2mortal(newSVpvn(s, t - s + 1));
 176
 177   indirect_map_store(o, s, sv);
 178  }
 179
 180  return o;
 181 }
 182
 183 /* ... ck_method ........................................................... */
 184
 185 STATIC OP *(*indirect_old_ck_method)(pTHX_ OP *) = 0;
 186
 187 STATIC OP *indirect_ck_method(pTHX_ OP *o) {
 188  if (indirect_hint()) {
 189   OP *op = cUNOPo->op_first;
 190   SV *sv;
 191   const char *s = indirect_map_fetch(op, &sv);
 192   if (!s) {
 193    sv = cSVOPx_sv(op);
 194    if (!SvPOK(sv) || (SvTYPE(sv) < SVt_PV))
 195     goto done;
 196    sv = sv_mortalcopy(sv);
 197    s  = indirect_find(sv, PL_parser->oldbufptr);
 198   }
 199   o = CALL_FPTR(indirect_old_ck_method)(aTHX_ o);
 200   /* o may now be a method_named */
 201   indirect_map_store(o, s, sv);
 202   return o;
 203  }
 204
 205 done:
 206  return CALL_FPTR(indirect_old_ck_method)(aTHX_ o);
 207 }
 208
 209 /* ... ck_entersub ......................................................... */
 210
 211 STATIC const char indirect_msg[] = "Indirect call of method \"%s\" on object \"%s\"";
 212
 213 STATIC OP *(*indirect_old_ck_entersub)(pTHX_ OP *) = 0;
 214
 215 STATIC OP *indirect_ck_entersub(pTHX_ OP *o) {
 216  LISTOP *op;
 217  OP *om, *oo;
 218  IV hint = indirect_hint();
 219
 220  o = CALL_FPTR(indirect_old_ck_entersub)(aTHX_ o);
 221
 222  if (hint) {
 223   const char *pm, *po;
 224   SV *svm, *svo;
 225   oo = o;
 226   do {
 227    op = (LISTOP *) oo;
 228    if (!op->op_flags & OPf_KIDS)
 229     goto done;
 230    oo = op->op_first;
 231   } while (oo->op_type != OP_PUSHMARK);
 232   oo = oo->op_sibling;
 233   om = op->op_last;
 234   if (om->op_type == OP_METHOD)
 235    om = cUNOPx(om)->op_first;
 236   else if (om->op_type != OP_METHOD_NAMED)
 237    goto done;
 238   pm = indirect_map_fetch(om, &svm);
 239   po = indirect_map_fetch(oo, &svo);
 240   if (pm && po && pm < po) {
 241    const char *psvm = SvPV_nolen_const(svm), *psvo = SvPV_nolen_const(svo);
 242    if (hint == 2)
 243     croak(indirect_msg, psvm, psvo);
 244    else
 245     warn(indirect_msg, psvm, psvo);
 246   }
 247 done:
 248   indirect_map_clean(o);
 249  }
 250
 251  return o;
 252 }
 253
 254 STATIC U32 indirect_initialized = 0;
 255
 256 /* --- XS ------------------------------------------------------------------ */
 257
 258 MODULE = indirect      PACKAGE = indirect
 259
 260 PROTOTYPES: DISABLE
 261
 262 BOOT:
 263 {
 264  if (!indirect_initialized++) {
 265   PERL_HASH(indirect_hash, "indirect", 8);
 266   indirect_map = newHV();
 267   indirect_old_ck_const    = PL_check[OP_CONST];
 268   PL_check[OP_CONST]       = MEMBER_TO_FPTR(indirect_ck_const);
 269   indirect_old_ck_rv2sv    = PL_check[OP_RV2SV];
 270   PL_check[OP_RV2SV]       = MEMBER_TO_FPTR(indirect_ck_rv2sv);
 271   indirect_old_ck_padany   = PL_check[OP_PADANY];
 272   PL_check[OP_PADANY]      = MEMBER_TO_FPTR(indirect_ck_padany);
 273   indirect_old_ck_method   = PL_check[OP_METHOD];
 274   PL_check[OP_METHOD]      = MEMBER_TO_FPTR(indirect_ck_method);
 275   indirect_old_ck_entersub = PL_check[OP_ENTERSUB];
 276   PL_check[OP_ENTERSUB]    = MEMBER_TO_FPTR(indirect_ck_entersub);
 277  }
 278 }