indirect.xs

   1 #define PERL_NO_GET_CONTEXT
   2 #include "EXTERN.h"
   3 #include "perl.h"
   4 #include "XSUB.h"
   5
   6 #ifndef SvPVX_const
   7 # define SvPVX_const SvPVX
   8 #endif
   9
  10 STATIC U32 indirect_initialized = 0;
  11 STATIC U32 indirect_hash = 0;
  12
  13 STATIC const char indirect_msg[] = "Indirect call of method \"%s\" on object \"%s\"";
  14
  15 STATIC HV *indirect_map = NULL;
  16 STATIC const char *indirect_linestr = NULL;
  17
  18 STATIC UV indirect_hint(pTHX) {
  19 #define indirect_hint() indirect_hint(aTHX)
  20  SV *id = Perl_refcounted_he_fetch(aTHX_ PL_curcop->cop_hints_hash,
  21                                          NULL,
  22                                          "indirect", 8,
  23                                          0,
  24                                          indirect_hash);
  25  return SvOK(id) ? SvUV(id) : 0;
  26 }
  27
  28 STATIC void indirect_map_store(pTHX_ const OP *o, const char *src, SV *sv) {
  29 #define indirect_map_store(O, S, N) indirect_map_store(aTHX_ (O), (S), (N))
  30  char buf[32];
  31  const char *pl_linestr;
  32  SV *val;
  33
  34  /* When lex_inwhat is set, we're in a quotelike environment (qq, qr, but not q)
  35   * In this case the linestr has temporarly changed, but the old buffer should
  36   * still be alive somewhere. */
  37
  38  if (!PL_parser->lex_inwhat) {
  39   pl_linestr = SvPVX_const(PL_parser->linestr);
  40   if (indirect_linestr != pl_linestr) {
  41    hv_clear(indirect_map);
  42    indirect_linestr = pl_linestr;
  43   }
  44  }
  45
  46  val = newSVsv(sv);
  47  SvUPGRADE(val, SVt_PVIV);
  48  SvUVX(val) = PTR2UV(src);
  49  if (!hv_store(indirect_map, buf, sprintf(buf, "%u", PTR2UV(o)), val, 0))
  50   SvREFCNT_dec(val);
  51 }
  52
  53 STATIC const char *indirect_map_fetch(pTHX_ const OP *o, SV ** const name) {
  54 #define indirect_map_fetch(O, S) indirect_map_fetch(aTHX_ (O), (S))
  55  char buf[32];
  56  SV **val;
  57
  58  if (indirect_linestr != SvPVX(PL_parser->linestr))
  59   return NULL;
  60
  61  val = hv_fetch(indirect_map, buf, sprintf(buf, "%u", PTR2UV(o)), 0);
  62  if (!val) {
  63   *name = NULL;
  64   return NULL;
  65  }
  66
  67  *name = *val;
  68  return INT2PTR(const char *, SvUVX(*val));
  69 }
  70
  71 STATIC const char *indirect_find(pTHX_ SV *sv, const char *s) {
  72 #define indirect_find(N, S) indirect_find(aTHX_ (N), (S))
  73  STRLEN len;
  74  const char *p = NULL, *r = SvPV_const(sv, len);
  75
  76  if (!len)
  77   return s;
  78
  79  p = strstr(s, r);
  80  while (p) {
  81   p += len;
  82   if (!isALNUM(*p))
  83    break;
  84   p = strstr(p + 1, r);
  85  }
  86
  87  return p;
  88 }
  89
  90 STATIC OP *(*indirect_old_ck_const)(pTHX_ OP *) = 0;
  91
  92 STATIC OP *indirect_ck_const(pTHX_ OP *o) {
  93  if (indirect_hint()) {
  94   SV *sv = cSVOPo_sv;
  95   if (SvPOK(sv) && (SvTYPE(sv) >= SVt_PV))
  96    indirect_map_store(o, indirect_find(sv, PL_parser->oldbufptr), sv);
  97  }
  98
  99  return CALL_FPTR(indirect_old_ck_const)(aTHX_ o);
 100 }
 101
 102 STATIC OP *(*indirect_old_ck_rv2sv)(pTHX_ OP *) = 0;
 103
 104 STATIC OP *indirect_ck_rv2sv(pTHX_ OP *o) {
 105  if (indirect_hint()) {
 106   OP *op = cUNOPo->op_first;
 107   SV *name = cSVOPx_sv(op);
 108   if (SvPOK(name) && (SvTYPE(name) >= SVt_PV)) {
 109    SV *sv = sv_2mortal(newSVpvn("$", 1));
 110    sv_catsv(sv, name);
 111    indirect_map_store(o, indirect_find(sv, PL_parser->oldbufptr), sv);
 112   }
 113  }
 114
 115  return CALL_FPTR(indirect_old_ck_rv2sv)(aTHX_ o);
 116 }
 117
 118 STATIC OP *(*indirect_old_ck_padany)(pTHX_ OP *) = 0;
 119
 120 STATIC OP *indirect_ck_padany(pTHX_ OP *o) {
 121  if (indirect_hint()) {
 122   SV *sv;
 123   const char *s = PL_parser->oldbufptr, *t = PL_parser->bufptr - 1;
 124
 125   while (s < t && isSPACE(*s)) ++s;
 126   while (t > s && isSPACE(*t)) --t;
 127   sv = sv_2mortal(newSVpvn(s, t - s + 1));
 128
 129   indirect_map_store(o, s, sv);
 130  }
 131
 132  return CALL_FPTR(indirect_old_ck_padany)(aTHX_ o);
 133 }
 134
 135 STATIC OP *(*indirect_old_ck_method)(pTHX_ OP *) = 0;
 136
 137 STATIC OP *indirect_ck_method(pTHX_ OP *o) {
 138  if (indirect_hint()) {
 139   OP *op = cUNOPo->op_first;
 140   SV *sv;
 141   const char *s = indirect_map_fetch(op, &sv);
 142   if (!s) {
 143    sv = cSVOPx_sv(op);
 144    if (!SvPOK(sv) || (SvTYPE(sv) < SVt_PV))
 145     goto done;
 146    sv = sv_mortalcopy(sv);
 147    s  = indirect_find(sv, PL_parser->oldbufptr);
 148   }
 149   o = CALL_FPTR(indirect_old_ck_method)(aTHX_ o);
 150   /* o may now be a method_named */
 151   indirect_map_store(o, s, sv);
 152   return o;
 153  }
 154
 155 done:
 156  return CALL_FPTR(indirect_old_ck_method)(aTHX_ o);
 157 }
 158
 159 STATIC OP *(*indirect_old_ck_entersub)(pTHX_ OP *) = 0;
 160
 161 STATIC OP *indirect_ck_entersub(pTHX_ OP *o) {
 162  LISTOP *op;
 163  OP *om, *oo;
 164  UV hint = indirect_hint();
 165
 166  if (hint) {
 167   const char *pm, *po;
 168   SV *svm, *svo;
 169   op = (LISTOP *) o;
 170   while (op->op_type != OP_PUSHMARK)
 171    op = (LISTOP *) op->op_first;
 172   oo = op->op_sibling;
 173   om = oo;
 174   while (om->op_sibling)
 175    om = om->op_sibling;
 176   if (om->op_type == OP_METHOD)
 177    om = cUNOPx(om)->op_first;
 178   else if (om->op_type != OP_METHOD_NAMED)
 179    goto done;
 180   pm = indirect_map_fetch(om, &svm);
 181   po = indirect_map_fetch(oo, &svo);
 182   if (pm && po && pm < po)
 183    ((hint == 2) ? croak : warn)(indirect_msg, SvPV_nolen(svm), SvPV_nolen(svo));
 184  }
 185
 186 done:
 187  return CALL_FPTR(indirect_old_ck_entersub)(aTHX_ o);
 188 }
 189
 190 MODULE = indirect      PACKAGE = indirect
 191
 192 PROTOTYPES: DISABLE
 193
 194 BOOT:
 195 {
 196  if (!indirect_initialized++) {
 197   PERL_HASH(indirect_hash, "indirect", 8);
 198   indirect_map = newHV();
 199   indirect_old_ck_const    = PL_check[OP_CONST];
 200   PL_check[OP_CONST]       = MEMBER_TO_FPTR(indirect_ck_const);
 201   indirect_old_ck_rv2sv    = PL_check[OP_RV2SV];
 202   PL_check[OP_RV2SV]       = MEMBER_TO_FPTR(indirect_ck_rv2sv);
 203   indirect_old_ck_padany   = PL_check[OP_PADANY];
 204   PL_check[OP_PADANY]      = MEMBER_TO_FPTR(indirect_ck_padany);
 205   indirect_old_ck_method   = PL_check[OP_METHOD];
 206   PL_check[OP_METHOD]      = MEMBER_TO_FPTR(indirect_ck_method);
 207   indirect_old_ck_entersub = PL_check[OP_ENTERSUB];
 208   PL_check[OP_ENTERSUB]    = MEMBER_TO_FPTR(indirect_ck_entersub);
 209  }
 210 }