Name.xs

   1 /* Copyright (C) 2004, 2008  Matthijs van Duin.  All rights reserved.
   2  * Copyright (C) 2014, cPanel Inc.  All rights reserved.
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the same terms as Perl itself.
   5  */
   6
   7 #include "EXTERN.h"
   8 #include "perl.h"
   9 #include "XSUB.h"
  10 #define NEED_sv_2pv_flags
  11 #define NEED_newSVpvn_flags
  12 #define NEED_gv_fetchpvn_flags
  13 #include "ppport.h"
  14
  15 static MGVTBL subname_vtbl;
  16
  17 #ifndef PERL_MAGIC_ext
  18 # define PERL_MAGIC_ext '~'
  19 #endif
  20
  21 #ifndef SvMAGIC_set
  22 #define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
  23 #endif
  24
  25 #ifndef Newxz
  26 #define Newxz(ptr, num, type)   Newz(0, ptr, num, type)
  27 #endif
  28
  29 #ifndef HvNAMELEN_get
  30 #define HvNAMELEN_get(stash) strlen(HvNAME(stash))
  31 #endif
  32
  33 #ifndef HvNAMEUTF8
  34 #define HvNAMEUTF8(stash) 0
  35 #endif
  36
  37 #ifndef GvNAMEUTF8
  38 #ifdef GvNAME_HEK
  39 #define GvNAMEUTF8(gv) HEK_UTF8(GvNAME_HEK(gv))
  40 #else
  41 #define GvNAMEUTF8(gv) 0
  42 #endif
  43 #endif
  44
  45 #ifndef SV_CATUTF8
  46 #define SV_CATUTF8 0
  47 #endif
  48
  49 #ifndef SV_CATBYTES
  50 #define SV_CATBYTES 0
  51 #endif
  52
  53 MODULE = Sub::Name  PACKAGE = Sub::Name
  54
  55 PROTOTYPES: DISABLE
  56
  57 void
  58 subname(name, sub)
  59         SV *name
  60         SV *sub
  61     PREINIT:
  62         CV *cv = NULL;
  63         GV *gv;
  64         HV *stash = CopSTASH(PL_curcop);
  65         const char *s, *end = NULL, *begin = NULL;
  66         MAGIC *mg;
  67         STRLEN namelen;
  68         const char* nameptr = SvPV(name, namelen);
  69         int utf8flag = SvUTF8(name);
  70         int seen_quote = 0, need_subst = 0;
  71     PPCODE:
  72         if (!SvROK(sub) && SvGMAGICAL(sub))
  73                 mg_get(sub);
  74         if (SvROK(sub))
  75                 cv = (CV *) SvRV(sub);
  76         else if (SvTYPE(sub) == SVt_PVGV)
  77                 cv = GvCVu(sub);
  78         else if (!SvOK(sub))
  79                 croak(PL_no_usym, "a subroutine");
  80         else if (PL_op->op_private & HINT_STRICT_REFS)
  81                 croak("Can't use string (\"%.32s\") as %s ref while \"strict refs\" in use",
  82                       SvPV_nolen(sub), "a subroutine");
  83         else if ((gv = gv_fetchsv(sub, FALSE, SVt_PVCV)))
  84                 cv = GvCVu(gv);
  85         if (!cv)
  86                 croak("Undefined subroutine %s", SvPV_nolen(sub));
  87         if (SvTYPE(cv) != SVt_PVCV && SvTYPE(cv) != SVt_PVFM)
  88                 croak("Not a subroutine reference");
  89
  90         for (s = nameptr; s <= nameptr + namelen; s++) {
  91                 if (s > nameptr && *s == ':' && s[-1] == ':') {
  92                         end = s - 1;
  93                         begin = ++s;
  94                         if (seen_quote)
  95                                 need_subst++;
  96                 }
  97                 else if (s > nameptr && *s != '\0' && s[-1] == '\'') {
  98                         end = s - 1;
  99                         begin = s;
 100                         if (seen_quote++)
 101                                 need_subst++;
 102                 }
 103         }
 104         s--;
 105         if (end) {
 106                 SV* tmp;
 107                 if (need_subst) {
 108                         STRLEN length = end - nameptr + seen_quote - (*end == '\'' ? 1 : 0);
 109                         char* left;
 110                         int i, j;
 111                         tmp = newSV(length);
 112                         left = SvPVX(tmp);
 113                         for (i = 0, j = 0; j < end - nameptr; ++i, ++j) {
 114                                 if (nameptr[j] == '\'') {
 115                                         left[i] = ':';
 116                                         left[++i] = ':';
 117                                 }
 118                                 else {
 119                                         left[i] = nameptr[j];
 120                                 }
 121                         }
 122                         stash = gv_stashpvn(left, length, GV_ADD | utf8flag);
 123                         SvREFCNT_dec(tmp);
 124                 }
 125                 else
 126                         stash = gv_stashpvn(nameptr, end - nameptr, GV_ADD | utf8flag);
 127                 nameptr = begin;
 128                 namelen -= begin - nameptr;
 129         }
 130
 131         /* under debugger, provide information about sub location */
 132         if (PL_DBsub && CvGV(cv)) {
 133                 HV* DBsub = GvHV(PL_DBsub);
 134                 HE* old_data;
 135
 136                 GV* oldgv = CvGV(cv);
 137                 HV* oldhv = GvSTASH(oldgv);
 138                 SV* old_full_name = newSVpvn_flags(HvNAME(oldhv), HvNAMELEN_get(oldhv), HvNAMEUTF8(oldhv) ? SVf_UTF8 : 0);
 139                 sv_catpvn(old_full_name, "::", 2);
 140                 sv_catpvn_flags(old_full_name, GvNAME(oldgv), GvNAMELEN(oldgv), GvNAMEUTF8(oldgv) ? SV_CATUTF8 : SV_CATBYTES);
 141
 142                 old_data = hv_fetch_ent(DBsub, old_full_name, 0, 0);
 143
 144                 SvREFCNT_dec(old_full_name);
 145
 146                 if (old_data && HeVAL(old_data)) {
 147                         SV* new_full_name = newSVpvn_flags(HvNAME(stash), HvNAMELEN_get(stash), HvNAMEUTF8(stash) ? SVf_UTF8 : 0);
 148                         sv_catpvn(new_full_name, "::", 2);
 149                         sv_catpvn_flags(new_full_name, nameptr, s - nameptr, utf8flag ? SV_CATUTF8 : SV_CATBYTES);
 150                         SvREFCNT_inc(HeVAL(old_data));
 151                         if (hv_store_ent(DBsub, new_full_name, HeVAL(old_data), 0) != NULL)
 152                                 SvREFCNT_inc(HeVAL(old_data));
 153                         SvREFCNT_dec(new_full_name);
 154                 }
 155         }
 156
 157         gv = (GV *) newSV(0);
 158         gv_init_pvn(gv, stash, nameptr, s - nameptr, GV_ADDMULTI | utf8flag);
 159
 160         mg = SvMAGIC(cv);
 161         while (mg && mg->mg_virtual != &subname_vtbl)
 162                 mg = mg->mg_moremagic;
 163         if (!mg) {
 164                 Newxz(mg, 1, MAGIC);
 165                 mg->mg_moremagic = SvMAGIC(cv);
 166                 mg->mg_type = PERL_MAGIC_ext;
 167                 mg->mg_virtual = &subname_vtbl;
 168                 SvMAGIC_set(cv, mg);
 169         }
 170         if (mg->mg_flags & MGf_REFCOUNTED)
 171                 SvREFCNT_dec(mg->mg_obj);
 172         mg->mg_flags |= MGf_REFCOUNTED;
 173         mg->mg_obj = (SV *) gv;
 174         SvRMAGICAL_on(cv);
 175         CvANON_off(cv);
 176 #ifndef CvGV_set
 177         CvGV(cv) = gv;
 178 #else
 179         CvGV_set(cv, gv);
 180 #endif
 181         PUSHs(sub);