# define POSION_SV_HEAD(sv)
#endif
+/* Mark an SV head as unused, and add to free list.
+ *
+ * If SVf_BREAK is set, skip adding it to the free list, as this SV had
+ * its refcount artificially decremented during global destruction, so
+ * there may be dangling pointers to it. The last thing we want in that
+ * case is for it to be reused. */
+
#define plant_SV(p) \
STMT_START { \
+ const U32 old_flags = SvFLAGS(p); \
FREE_SV_DEBUG_FILE(p); \
POSION_SV_HEAD(p); \
- SvARENA_CHAIN(p) = (void *)PL_sv_root; \
SvFLAGS(p) = SVTYPEMASK; \
- PL_sv_root = (p); \
+ if (!(old_flags & SVf_BREAK)) { \
+ SvARENA_CHAIN(p) = (void *)PL_sv_root; \
+ PL_sv_root = (p); \
+ } \
--PL_sv_count; \
} STMT_END
SvREFCNT(sv) = 1;
SvFLAGS(sv) = 0;
sv->sv_debug_optype = PL_op ? PL_op->op_type : 0;
- sv->sv_debug_line = (U16) (PL_parser
- ? PL_parser->copline == NOLINE
- ? PL_curcop
+ sv->sv_debug_line = (U16) (PL_parser && PL_parser->copline != NOLINE
+ ? PL_parser->copline
+ : PL_curcop
? CopLINE(PL_curcop)
: 0
- : PL_parser->copline
- : 0);
+ );
sv->sv_debug_inpad = 0;
sv->sv_debug_cloned = 0;
sv->sv_debug_file = PL_curcop ? savepv(CopFILE(PL_curcop)): NULL;
do_clean_all(pTHX_ SV *const sv)
{
dVAR;
+ if (sv == (SV*) PL_fdpid || sv == (SV *)PL_strtab) {
+ /* don't clean pid table and strtab */
+ return;
+ }
DEBUG_D((PerlIO_printf(Perl_debug_log, "Cleaning loops: SV at 0x%"UVxf"\n", PTR2UV(sv)) ));
SvFLAGS(sv) |= SVf_BREAK;
SvREFCNT_dec(sv);
s = SvPVX_mutable(sv);
if (newlen > SvLEN(sv)) { /* need more room? */
-#ifndef MYMALLOC
+#ifndef Perl_safesysmalloc_size
newlen = PERL_STRLEN_ROUNDUP(newlen);
#endif
if (SvLEN(sv) && s) {
break;
case SVt_PVGV:
+ if (!isGV_with_GP(sv))
+ break;
case SVt_PVAV:
case SVt_PVHV:
case SVt_PVCV:
break;
case SVt_PVGV:
+ if (!isGV_with_GP(sv))
+ break;
case SVt_PVAV:
case SVt_PVHV:
case SVt_PVCV:
const U8 ch = *t++;
/* Check for hi bit */
if (!NATIVE_IS_INVARIANT(ch)) {
- STRLEN len = SvCUR(sv) + 1; /* Plus the \0 */
+ STRLEN len = SvCUR(sv);
+ /* *Currently* bytes_to_utf8() adds a '\0' after every string
+ it converts. This isn't documented. It's not clear if it's
+ a bad thing to be doing, and should be changed to do exactly
+ what the documentation says. If so, this code will have to
+ be changed.
+ As is, we mustn't rely on our incoming SV being well formed
+ and having a trailing '\0', as certain code in pp_formline
+ can send us partially built SVs. */
U8 * const recoded = bytes_to_utf8((U8*)s, &len);
SvPV_free(sv); /* No longer using what was there before. */
SvPV_set(sv, (char*)recoded);
- SvCUR_set(sv, len - 1);
- SvLEN_set(sv, len); /* No longer know the real size. */
+ SvCUR_set(sv, len);
+ SvLEN_set(sv, len + 1); /* No longer know the real size. */
break;
}
}
{
/* need to nuke the magic */
mg_free(dstr);
- SvRMAGICAL_off(dstr);
}
/* There's a lot of redundancy below but we're going for speed here */
Perl_croak(aTHX_ "Cannot copy to %s", type);
} else if (sflags & SVf_ROK) {
if (isGV_with_GP(dstr) && dtype == SVt_PVGV
- && SvTYPE(SvRV(sstr)) == SVt_PVGV) {
+ && SvTYPE(SvRV(sstr)) == SVt_PVGV && isGV_with_GP(SvRV(sstr))) {
sstr = SvRV(sstr);
if (sstr == dstr) {
if (GvIMPORTED(dstr) != GVf_IMPORTED
#ifdef DEBUGGING
const U8 *real_start;
#endif
+ STRLEN max_delta;
PERL_ARGS_ASSERT_SV_CHOP;
/* Nothing to do. */
return;
}
- assert(ptr > SvPVX_const(sv));
+ /* SvPVX(sv) may move in SV_CHECK_THINKFIRST(sv), but after this line,
+ nothing uses the value of ptr any more. */
+ max_delta = SvLEN(sv) ? SvLEN(sv) : SvCUR(sv);
+ if (ptr <= SvPVX_const(sv))
+ Perl_croak(aTHX_ "panic: sv_chop ptr=%p, start=%p, end=%p",
+ ptr, SvPVX_const(sv), SvPVX_const(sv) + max_delta);
SV_CHECK_THINKFIRST(sv);
+ if (delta > max_delta)
+ Perl_croak(aTHX_ "panic: sv_chop ptr=%p (was %p), start=%p, end=%p",
+ SvPVX_const(sv) + delta, ptr, SvPVX_const(sv),
+ SvPVX_const(sv) + max_delta);
if (!SvOOK(sv)) {
if (!SvLEN(sv)) { /* make copy of shared string */
* back-reference to sv onto the array associated with the backref magic.
*/
+/* A discussion about the backreferences array and its refcount:
+ *
+ * The AV holding the backreferences is pointed to either as the mg_obj of
+ * PERL_MAGIC_backref, or in the specific case of a HV that has the hv_aux
+ * structure, from the xhv_backreferences field. (A HV without hv_aux will
+ * have the standard magic instead.) The array is created with a refcount
+ * of 2. This means that if during global destruction the array gets
+ * picked on first to have its refcount decremented by the random zapper,
+ * it won't actually be freed, meaning it's still theere for when its
+ * parent gets freed.
+ * When the parent SV is freed, in the case of magic, the magic is freed,
+ * Perl_magic_killbackrefs is called which decrements one refcount, then
+ * mg_obj is freed which kills the second count.
+ * In the vase of a HV being freed, one ref is removed by
+ * Perl_hv_kill_backrefs, the other by Perl_sv_kill_backrefs, which it
+ * calls.
+ */
+
void
Perl_sv_add_backref(pTHX_ SV *const tsv, SV *const sv)
{
} else {
av = newAV();
AvREAL_off(av);
- SvREFCNT_inc_simple_void(av);
+ SvREFCNT_inc_simple_void(av); /* see discussion above */
}
*avp = av;
}
av = newAV();
AvREAL_off(av);
sv_magic(tsv, (SV*)av, PERL_MAGIC_backref, NULL, 0);
- /* av now has a refcnt of 2, which avoids it getting freed
- * before us during global cleanup. The extra ref is removed
- * by magic_killbackrefs() when tsv is being freed */
+ /* av now has a refcnt of 2; see discussion above */
}
}
if (AvFILLp(av) >= AvMAX(av)) {
if (mg)
av = (AV *)mg->mg_obj;
}
- if (!av) {
- if (PL_in_clean_all)
- return;
+
+ if (!av)
Perl_croak(aTHX_ "panic: del_backref");
- }
- if (SvIS_FREED(av))
- return;
+ assert(!SvIS_FREED(av));
svp = AvARRAY(av);
/* We shouldn't be in here more than once, but for paranoia reasons lets
PERL_ARGS_ASSERT_SV_KILL_BACKREFS;
PERL_UNUSED_ARG(sv);
- /* Not sure why the av can get freed ahead of its sv, but somehow it does
- in ext/B/t/bytecode.t test 15 (involving print <DATA>) */
- if (svp && !SvIS_FREED(av)) {
+ assert(!svp || !SvIS_FREED(av));
+ if (svp) {
SV *const *const last = svp + AvFILLp(av);
while (svp <= last) {
=for apidoc sv_insert
Inserts a string at the specified offset/length within the SV. Similar to
-the Perl substr() function.
+the Perl substr() function. Handles get magic.
+
+=for apidoc sv_insert_flags
+
+Same as C<sv_insert>, but the extra C<flags> are passed the C<SvPV_force_flags> that applies to C<bigstr>.
=cut
*/
void
-Perl_sv_insert(pTHX_ SV *const bigstr, const STRLEN offset, const STRLEN len,
- const char *const little, const STRLEN littlelen)
+Perl_sv_insert_flags(pTHX_ SV *const bigstr, const STRLEN offset, const STRLEN len, const char *const little, const STRLEN littlelen, const U32 flags)
{
dVAR;
register char *big;
register I32 i;
STRLEN curlen;
- PERL_ARGS_ASSERT_SV_INSERT;
+ PERL_ARGS_ASSERT_SV_INSERT_FLAGS;
if (!bigstr)
Perl_croak(aTHX_ "Can't modify non-existent substring");
- SvPV_force(bigstr, curlen);
+ SvPV_force_flags(bigstr, curlen, flags);
(void)SvPOK_only_UTF8(bigstr);
if (offset + len > curlen) {
SvGROW(bigstr, offset+len+1);
boffset = real_boffset;
}
- S_utf8_mg_pos_cache_update(aTHX_ sv, mgp, boffset, uoffset, send - start);
+ if (PL_utf8cache)
+ utf8_mg_pos_cache_update(sv, mgp, boffset, uoffset, send - start);
return boffset;
}
}
*offsetp = len;
- S_utf8_mg_pos_cache_update(aTHX_ sv, &mg, byte, len, blen);
+ if (PL_utf8cache)
+ utf8_mg_pos_cache_update(sv, &mg, byte, len, blen);
}
/*
I32 bytesread;
char *buffer;
U32 recsize;
+#ifdef VMS
+ int fd;
+#endif
/* Grab the size of the record we're getting */
recsize = SvUV(SvRV(PL_rs)); /* RsRECORD() guarantees > 0. */
/* doing, but we've got no other real choice - except avoid stdio
as implementation - perhaps write a :vms layer ?
*/
- bytesread = PerlLIO_read(PerlIO_fileno(fp), buffer, recsize);
+ fd = PerlIO_fileno(fp);
+ if (fd == -1) { /* in-memory file from PerlIO::Scalar */
+ bytesread = PerlIO_read(fp, buffer, recsize);
+ }
+ else {
+ bytesread = PerlLIO_read(fd, buffer, recsize);
+ }
#else
bytesread = PerlIO_read(fp, buffer, recsize);
#endif
if (bytesread < 0)
bytesread = 0;
- SvCUR_set(sv, bytesread += append);
+ SvCUR_set(sv, bytesread + append);
buffer[bytesread] = '\0';
goto return_string_or_null;
}
if (!hash)
PERL_HASH(hash, src, len);
new_SV(sv);
+ /* The logic for this is inlined in S_mro_get_linear_isa_dfs(), so if it
+ changes here, update it there too. */
sv_upgrade(sv, SVt_PV);
SvPV_set(sv, sharepvn(src, is_utf8?-len:len, hash));
SvCUR_set(sv, len);
io = (IO*)sv;
break;
case SVt_PVGV:
- gv = (GV*)sv;
- io = GvIO(gv);
- if (!io)
- Perl_croak(aTHX_ "Bad filehandle: %s", GvNAME(gv));
- break;
+ if (isGV_with_GP(sv)) {
+ gv = (GV*)sv;
+ io = GvIO(gv);
+ if (!io)
+ Perl_croak(aTHX_ "Bad filehandle: %s", GvNAME(gv));
+ break;
+ }
+ /* FALL THROUGH */
default:
if (!SvOK(sv))
Perl_croak(aTHX_ PL_no_usym, "filehandle");
*gvp = NULL;
return NULL;
case SVt_PVGV:
- gv = (GV*)sv;
- *gvp = gv;
- *st = GvESTASH(gv);
- goto fix_gv;
+ if (isGV_with_GP(sv)) {
+ gv = (GV*)sv;
+ *gvp = gv;
+ *st = GvESTASH(gv);
+ goto fix_gv;
+ }
+ /* FALL THROUGH */
default:
- SvGETMAGIC(sv);
if (SvROK(sv)) {
SV * const *sp = &sv; /* Used in tryAMAGICunDEREF macro. */
+ SvGETMAGIC(sv);
tryAMAGICunDEREF(to_cv);
sv = SvRV(sv);
*st = CvSTASH(cv);
return cv;
}
- else if(isGV(sv))
+ else if(isGV_with_GP(sv))
gv = (GV*)sv;
else
Perl_croak(aTHX_ "Not a subroutine reference");
}
- else if (isGV(sv))
+ else if (isGV_with_GP(sv)) {
+ SvGETMAGIC(sv);
gv = (GV*)sv;
+ }
else
- gv = gv_fetchsv(sv, lref, SVt_PVCV);
+ gv = gv_fetchsv(sv, lref, SVt_PVCV); /* Calls get magic */
*gvp = gv;
if (!gv) {
*st = NULL;
return NULL;
}
/* Some flags to gv_fetchsv mean don't really create the GV */
- if (SvTYPE(gv) != SVt_PVGV) {
+ if (!isGV_with_GP(gv)) {
*st = NULL;
return NULL;
}
LEAVE;
if (!GvCVu(gv))
Perl_croak(aTHX_ "Unable to create sub named \"%"SVf"\"",
- SVfARG(sv));
+ SVfARG(SvOK(sv) ? sv : &PL_sv_no));
}
return GvCVu(gv);
}
case SVt_PVAV: return "ARRAY";
case SVt_PVHV: return "HASH";
case SVt_PVCV: return "CODE";
- case SVt_PVGV: return "GLOB";
+ case SVt_PVGV: return (char *) (isGV_with_GP(sv)
+ ? "GLOB" : "SCALAR");
case SVt_PVFM: return "FORMAT";
case SVt_PVIO: return "IO";
case SVt_BIND: return "BIND";
/* duplicate a file handle */
PerlIO *
-Perl_fp_dup(pTHX_ PerlIO *fp, char type, CLONE_PARAMS *param)
+Perl_fp_dup(pTHX_ PerlIO *const fp, const char type, CLONE_PARAMS *const param)
{
PerlIO *ret;
/* map an existing pointer using a table */
STATIC PTR_TBL_ENT_t *
-S_ptr_table_find(PTR_TBL_t *tbl, const void *sv)
+S_ptr_table_find(PTR_TBL_t *const tbl, const void *const sv)
{
PTR_TBL_ENT_t *tblent;
const UV hash = PTR_TABLE_HASH(sv);
}
void *
-Perl_ptr_table_fetch(pTHX_ PTR_TBL_t *tbl, const void *sv)
+Perl_ptr_table_fetch(pTHX_ PTR_TBL_t *const tbl, const void *const sv)
{
PTR_TBL_ENT_t const *const tblent = ptr_table_find(tbl, sv);
/* add a new entry to a pointer-mapping table */
void
-Perl_ptr_table_store(pTHX_ PTR_TBL_t *tbl, const void *oldsv, void *newsv)
+Perl_ptr_table_store(pTHX_ PTR_TBL_t *const tbl, const void *const oldsv, void *const newsv)
{
PTR_TBL_ENT_t *tblent = ptr_table_find(tbl, oldsv);
/* double the hash bucket size of an existing ptr table */
void
-Perl_ptr_table_split(pTHX_ PTR_TBL_t *tbl)
+Perl_ptr_table_split(pTHX_ PTR_TBL_t *const tbl)
{
PTR_TBL_ENT_t **ary = tbl->tbl_ary;
const UV oldsize = tbl->tbl_max + 1;
/* remove all the entries from a ptr table */
void
-Perl_ptr_table_clear(pTHX_ PTR_TBL_t *tbl)
+Perl_ptr_table_clear(pTHX_ PTR_TBL_t *const tbl)
{
if (tbl && tbl->tbl_items) {
register PTR_TBL_ENT_t * const * const array = tbl->tbl_ary;
/* clear and free a ptr table */
void
-Perl_ptr_table_free(pTHX_ PTR_TBL_t *tbl)
+Perl_ptr_table_free(pTHX_ PTR_TBL_t *const tbl)
{
if (!tbl) {
return;
#if defined(USE_ITHREADS)
void
-Perl_rvpv_dup(pTHX_ SV *dstr, const SV *sstr, CLONE_PARAMS* param)
+Perl_rvpv_dup(pTHX_ SV *const dstr, const SV *const sstr, CLONE_PARAMS *const param)
{
PERL_ARGS_ASSERT_RVPV_DUP;
/* duplicate an SV of any type (including AV, HV etc) */
SV *
-Perl_sv_dup(pTHX_ const SV *sstr, CLONE_PARAMS* param)
+Perl_sv_dup(pTHX_ const SV *const sstr, CLONE_PARAMS *const param)
{
dVAR;
SV *dstr;
daux->xhv_eiter = saux->xhv_eiter
? he_dup(saux->xhv_eiter,
(bool)!!HvSHAREKEYS(sstr), param) : 0;
+ /* backref array needs refcnt=2; see sv_add_backref */
daux->xhv_backreferences =
saux->xhv_backreferences
? (AV*) SvREFCNT_inc(
- sv_dup((SV*)saux->xhv_backreferences, param))
+ sv_dup_inc((SV*)saux->xhv_backreferences, param))
: 0;
daux->xhv_mro_meta = saux->xhv_mro_meta
*SvPVX(name) = '$';
Perl_sv_catpvf(aTHX_ name, "[%"IVdf"]", (IV)aindex);
}
- else if (subscript_type == FUV_SUBSCRIPT_WITHIN)
- Perl_sv_insert(aTHX_ name, 0, 0, STR_WITH_LEN("within "));
+ else if (subscript_type == FUV_SUBSCRIPT_WITHIN) {
+ /* We know that name has no magic, so can use 0 instead of SV_GMAGIC */
+ Perl_sv_insert_flags(aTHX_ name, 0, 0, STR_WITH_LEN("within "), 0);
+ }
return name;
}
case OP_PRTF:
case OP_PRINT:
case OP_SAY:
+ match = 1; /* print etc can return undef on defined args */
/* skip filehandle as it can't produce 'undef' warning */
o = cUNOPx(obase)->op_first;
if ((obase->op_flags & OPf_STACKED) && o->op_type == OP_PUSHMARK)
case OP_ENTEREVAL: /* could be eval $undef or $x='$undef'; eval $x */
case OP_RV2SV:
- case OP_CUSTOM:
- match = 1; /* XS or custom code could trigger random warnings */
+ case OP_CUSTOM: /* XS or custom code could trigger random warnings */
+
+ /* the following ops are capable of returning PL_sv_undef even for
+ * defined arg(s) */
+
+ case OP_BACKTICK:
+ case OP_PIPE_OP:
+ case OP_FILENO:
+ case OP_BINMODE:
+ case OP_TIED:
+ case OP_GETC:
+ case OP_SYSREAD:
+ case OP_SEND:
+ case OP_IOCTL:
+ case OP_SOCKET:
+ case OP_SOCKPAIR:
+ case OP_BIND:
+ case OP_CONNECT:
+ case OP_LISTEN:
+ case OP_ACCEPT:
+ case OP_SHUTDOWN:
+ case OP_SSOCKOPT:
+ case OP_GETPEERNAME:
+ case OP_FTRREAD:
+ case OP_FTRWRITE:
+ case OP_FTREXEC:
+ case OP_FTROWNED:
+ case OP_FTEREAD:
+ case OP_FTEWRITE:
+ case OP_FTEEXEC:
+ case OP_FTEOWNED:
+ case OP_FTIS:
+ case OP_FTZERO:
+ case OP_FTSIZE:
+ case OP_FTFILE:
+ case OP_FTDIR:
+ case OP_FTLINK:
+ case OP_FTPIPE:
+ case OP_FTSOCK:
+ case OP_FTBLK:
+ case OP_FTCHR:
+ case OP_FTTTY:
+ case OP_FTSUID:
+ case OP_FTSGID:
+ case OP_FTSVTX:
+ case OP_FTTEXT:
+ case OP_FTBINARY:
+ case OP_FTMTIME:
+ case OP_FTATIME:
+ case OP_FTCTIME:
+ case OP_READLINK:
+ case OP_OPEN_DIR:
+ case OP_READDIR:
+ case OP_TELLDIR:
+ case OP_SEEKDIR:
+ case OP_REWINDDIR:
+ case OP_CLOSEDIR:
+ case OP_GMTIME:
+ case OP_ALARM:
+ case OP_SEMGET:
+ case OP_GETLOGIN:
+ case OP_UNDEF:
+ case OP_SUBSTR:
+ case OP_AEACH:
+ case OP_EACH:
+ case OP_SORT:
+ case OP_CALLER:
+ case OP_DOFILE:
+ case OP_PROTOTYPE:
+ case OP_NCMP:
+ case OP_SMARTMATCH:
+ case OP_UNPACK:
+ case OP_SYSOPEN:
+ case OP_SYSSEEK:
+ match = 1;
goto do_op;
case OP_ENTERSUB:
Need a better fix at dome point. DAPM 11/2007 */
break;
+
case OP_POS:
/* def-ness of rval pos() is independent of the def-ness of its arg */
if ( !(obase->op_flags & OPf_MOD))
https://perl5.git.perl.org / perl5.git / blobdiff