STRLEN len;
STRLEN rarest = 0;
U32 frequency = 256;
+ MAGIC *mg;
PERL_ARGS_ASSERT_FBM_COMPILE;
if (SvSCREAM(sv))
return;
+ if (SvVALID(sv))
+ return;
+
if (flags & FBMcf_TAIL) {
MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ? mg_find(sv, PERL_MAGIC_utf8) : NULL;
sv_catpvs(sv, "\n"); /* Taken into account in fbm_instr() */
s = (U8*)SvPV_force_mutable(sv, len);
if (len == 0) /* TAIL might be on a zero-length string. */
return;
- SvUPGRADE(sv, SVt_PVGV);
+ SvUPGRADE(sv, SVt_PVMG);
SvIOK_off(sv);
SvNOK_off(sv);
SvVALID_on(sv);
+
+ /* "deep magic", the comment used to add. The use of MAGIC itself isn't
+ really. MAGIC was originally added in 79072805bf63abe5 (perl 5.0 alpha 2)
+ to call SvVALID_off() if the scalar was assigned to.
+
+ The comment itself (and "deeper magic" below) date back to
+ 378cc40b38293ffc (perl 2.0). "deep magic" was an annotation on
+ str->str_pok |= 2;
+ where the magic (presumably) was that the scalar had a BM table hidden
+ inside itself.
+
+ As MAGIC is always present on BMs [in Perl 5 :-)], we can use it to store
+ the table instead of the previous (somewhat hacky) approach of co-opting
+ the string buffer and storing it after the string. */
+
+ assert(!mg_find(sv, PERL_MAGIC_bm));
+ mg = sv_magicext(sv, NULL, PERL_MAGIC_bm, &PL_vtbl_bm, NULL, 0);
+ assert(mg);
+
if (len > 2) {
- const unsigned char *sb;
+ /* Shorter strings are special-cased in Perl_fbm_instr(), and don't use
+ the BM table. */
const U8 mlen = (len>255) ? 255 : (U8)len;
+ const unsigned char *const sb = s + len - mlen; /* first char (maybe) */
register U8 *table;
- Sv_Grow(sv, len + 256 + PERL_FBM_TABLE_OFFSET);
- table
- = (unsigned char*)(SvPVX_mutable(sv) + len + PERL_FBM_TABLE_OFFSET);
- s = table - 1 - PERL_FBM_TABLE_OFFSET; /* last char */
+ Newx(table, 256, U8);
memset((void*)table, mlen, 256);
+ mg->mg_ptr = (char *)table;
+ mg->mg_len = 256;
+
+ s += len - 1; /* last char */
i = 0;
- sb = s - mlen + 1; /* first char (maybe) */
while (s >= sb) {
if (table[*s] == mlen)
table[*s] = (U8)i;
s--, i++;
}
- } else {
- Sv_Grow(sv, len + PERL_FBM_TABLE_OFFSET);
}
- sv_magic(sv, NULL, PERL_MAGIC_bm, NULL, 0); /* deep magic */
s = (const unsigned char*)(SvPVX_const(sv)); /* deeper magic */
for (i = 0; i < len; i++) {
return NULL;
}
- if (littlelen <= 2) { /* Special-cased */
-
- if (littlelen == 1) {
+ switch (littlelen) { /* Special cases for 0, 1 and 2 */
+ case 0:
+ return (char*)big; /* Cannot be SvTAIL! */
+ case 1:
if (SvTAIL(littlestr) && !multiline) { /* Anchor only! */
/* Know that bigend != big. */
if (bigend[-1] == '\n')
if (SvTAIL(littlestr))
return (char *) bigend;
return NULL;
- }
- if (!littlelen)
- return (char*)big; /* Cannot be SvTAIL! */
-
- /* littlelen is 2 */
+ case 2:
if (SvTAIL(littlestr) && !multiline) {
if (bigend[-1] == '\n' && bigend[-2] == *little)
return (char*)bigend - 2;
if (SvTAIL(littlestr) && (*bigend == *little))
return (char *)bigend; /* bigend is already decremented. */
return NULL;
+ default:
+ break; /* Only lengths 0 1 and 2 have special-case code. */
}
+
if (SvTAIL(littlestr) && !multiline) { /* tail anchored? */
s = bigend - littlelen;
if (s >= big && bigend[-1] == '\n' && *s == *little
return NULL;
{
- register const unsigned char * const table
- = little + littlelen + PERL_FBM_TABLE_OFFSET;
+ const MAGIC *const mg = mg_find(littlestr, PERL_MAGIC_bm);
+ const unsigned char * const table = (const unsigned char *) mg->mg_ptr;
register const unsigned char *oldlittle;
--littlelen; /* Last char found by table lookup */
PERL_ARGS_ASSERT_SCREAMINSTR;
- assert(SvTYPE(littlestr) == SVt_PVGV);
+ assert(SvTYPE(littlestr) == SVt_PVMG);
assert(SvVALID(littlestr));
if (*old_posp == -1
MGVTBL*
Perl_get_vtbl(pTHX_ int vtbl_id)
{
- const MGVTBL* result;
PERL_UNUSED_CONTEXT;
- switch(vtbl_id) {
- case want_vtbl_sv:
- result = &PL_vtbl_sv;
- break;
- case want_vtbl_env:
- result = &PL_vtbl_env;
- break;
- case want_vtbl_envelem:
- result = &PL_vtbl_envelem;
- break;
- case want_vtbl_sig:
- result = &PL_vtbl_sig;
- break;
- case want_vtbl_sigelem:
- result = &PL_vtbl_sigelem;
- break;
- case want_vtbl_pack:
- result = &PL_vtbl_pack;
- break;
- case want_vtbl_packelem:
- result = &PL_vtbl_packelem;
- break;
- case want_vtbl_dbline:
- result = &PL_vtbl_dbline;
- break;
- case want_vtbl_isa:
- result = &PL_vtbl_isa;
- break;
- case want_vtbl_isaelem:
- result = &PL_vtbl_isaelem;
- break;
- case want_vtbl_arylen:
- result = &PL_vtbl_arylen;
- break;
- case want_vtbl_mglob:
- result = &PL_vtbl_mglob;
- break;
- case want_vtbl_nkeys:
- result = &PL_vtbl_nkeys;
- break;
- case want_vtbl_taint:
- result = &PL_vtbl_taint;
- break;
- case want_vtbl_substr:
- result = &PL_vtbl_substr;
- break;
- case want_vtbl_vec:
- result = &PL_vtbl_vec;
- break;
- case want_vtbl_pos:
- result = &PL_vtbl_pos;
- break;
- case want_vtbl_bm:
- result = &PL_vtbl_bm;
- break;
- case want_vtbl_fm:
- result = &PL_vtbl_fm;
- break;
- case want_vtbl_uvar:
- result = &PL_vtbl_uvar;
- break;
- case want_vtbl_defelem:
- result = &PL_vtbl_defelem;
- break;
- case want_vtbl_regexp:
- result = &PL_vtbl_regexp;
- break;
- case want_vtbl_regdata:
- result = &PL_vtbl_regdata;
- break;
- case want_vtbl_regdatum:
- result = &PL_vtbl_regdatum;
- break;
-#ifdef USE_LOCALE_COLLATE
- case want_vtbl_collxfrm:
- result = &PL_vtbl_collxfrm;
- break;
-#endif
- case want_vtbl_amagic:
- result = &PL_vtbl_amagic;
- break;
- case want_vtbl_amagicelem:
- result = &PL_vtbl_amagicelem;
- break;
- case want_vtbl_backref:
- result = &PL_vtbl_backref;
- break;
- case want_vtbl_utf8:
- result = &PL_vtbl_utf8;
- break;
- default:
- result = NULL;
- break;
- }
- return (MGVTBL*)result;
+ return (vtbl_id < 0 || vtbl_id >= magic_vtable_max)
+ ? NULL : PL_magic_vtables + vtbl_id;
}
I32
https://perl5.git.perl.org / perl5.git / blobdiff