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op.c
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op.c
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/* op.c
*
* Copyright (c) 1991-2000, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* "You see: Mr. Drogo, he married poor Miss Primula Brandybuck. She was
* our Mr. Bilbo's first cousin on the mother's side (her mother being the
* youngest of the Old Took's daughters); and Mr. Drogo was his second
* cousin. So Mr. Frodo is his first *and* second cousin, once removed
* either way, as the saying is, if you follow me." --the Gaffer
*/
#include "EXTERN.h"
#define PERL_IN_OP_C
#include "perl.h"
#include "keywords.h"
/* #define PL_OP_SLAB_ALLOC */
#ifdef PL_OP_SLAB_ALLOC
#define SLAB_SIZE 8192
static char *PL_OpPtr = NULL;
static int PL_OpSpace = 0;
#define NewOp(m,var,c,type) do { if ((PL_OpSpace -= c*sizeof(type)) >= 0) \
var = (type *)(PL_OpPtr -= c*sizeof(type)); \
else \
var = (type *) Slab_Alloc(m,c*sizeof(type)); \
} while (0)
STATIC void *
S_Slab_Alloc(pTHX_ int m, size_t sz)
{
Newz(m,PL_OpPtr,SLAB_SIZE,char);
PL_OpSpace = SLAB_SIZE - sz;
return PL_OpPtr += PL_OpSpace;
}
#else
#define NewOp(m, var, c, type) Newz(m, var, c, type)
#endif
/*
* In the following definition, the ", Nullop" is just to make the compiler
* think the expression is of the right type: croak actually does a Siglongjmp.
*/
#define CHECKOP(type,o) \
((PL_op_mask && PL_op_mask[type]) \
? ( op_free((OP*)o), \
Perl_croak(aTHX_ "%s trapped by operation mask", PL_op_desc[type]), \
Nullop ) \
: CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))
#define PAD_MAX 999999999
STATIC char*
S_gv_ename(pTHX_ GV *gv)
{
STRLEN n_a;
SV* tmpsv = sv_newmortal();
gv_efullname3(tmpsv, gv, Nullch);
return SvPV(tmpsv,n_a);
}
STATIC OP *
S_no_fh_allowed(pTHX_ OP *o)
{
yyerror(Perl_form(aTHX_ "Missing comma after first argument to %s function",
PL_op_desc[o->op_type]));
return o;
}
STATIC OP *
S_too_few_arguments(pTHX_ OP *o, char *name)
{
yyerror(Perl_form(aTHX_ "Not enough arguments for %s", name));
return o;
}
STATIC OP *
S_too_many_arguments(pTHX_ OP *o, char *name)
{
yyerror(Perl_form(aTHX_ "Too many arguments for %s", name));
return o;
}
STATIC void
S_bad_type(pTHX_ I32 n, char *t, char *name, OP *kid)
{
yyerror(Perl_form(aTHX_ "Type of arg %d to %s must be %s (not %s)",
(int)n, name, t, PL_op_desc[kid->op_type]));
}
STATIC void
S_no_bareword_allowed(pTHX_ OP *o)
{
qerror(Perl_mess(aTHX_
"Bareword \"%s\" not allowed while \"strict subs\" in use",
SvPV_nolen(cSVOPo_sv)));
}
/* "register" allocation */
PADOFFSET
Perl_pad_allocmy(pTHX_ char *name)
{
dTHR;
PADOFFSET off;
SV *sv;
if (!(PL_in_my == KEY_our ||
isALPHA(name[1]) ||
(PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
(name[1] == '_' && (int)strlen(name) > 2)))
{
if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
/* 1999-02-27 [email protected] */
char *p;
p = strchr(name, '\0');
/* The next block assumes the buffer is at least 205 chars
long. At present, it's always at least 256 chars. */
if (p-name > 200) {
strcpy(name+200, "...");
p = name+199;
}
else {
p[1] = '\0';
}
/* Move everything else down one character */
for (; p-name > 2; p--)
*p = *(p-1);
name[2] = toCTRL(name[1]);
name[1] = '^';
}
yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
}
if (ckWARN(WARN_MISC) && AvFILLp(PL_comppad_name) >= 0) {
SV **svp = AvARRAY(PL_comppad_name);
HV *ourstash = (PL_curstash ? PL_curstash : PL_defstash);
PADOFFSET top = AvFILLp(PL_comppad_name);
for (off = top; off > PL_comppad_name_floor; off--) {
if ((sv = svp[off])
&& sv != &PL_sv_undef
&& (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
&& (PL_in_my != KEY_our
|| ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash))
&& strEQ(name, SvPVX(sv)))
{
Perl_warner(aTHX_ WARN_MISC,
"\"%s\" variable %s masks earlier declaration in same %s",
(PL_in_my == KEY_our ? "our" : "my"),
name,
(SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
--off;
break;
}
}
if (PL_in_my == KEY_our) {
do {
if ((sv = svp[off])
&& sv != &PL_sv_undef
&& (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
&& ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)
&& strEQ(name, SvPVX(sv)))
{
Perl_warner(aTHX_ WARN_MISC,
"\"our\" variable %s redeclared", name);
Perl_warner(aTHX_ WARN_MISC,
"\t(Did you mean \"local\" instead of \"our\"?)\n");
break;
}
} while ( off-- > 0 );
}
}
off = pad_alloc(OP_PADSV, SVs_PADMY);
sv = NEWSV(1102,0);
sv_upgrade(sv, SVt_PVNV);
sv_setpv(sv, name);
if (PL_in_my_stash) {
if (*name != '$')
yyerror(Perl_form(aTHX_ "Can't declare class for non-scalar %s in \"%s\"",
name, PL_in_my == KEY_our ? "our" : "my"));
SvOBJECT_on(sv);
(void)SvUPGRADE(sv, SVt_PVMG);
SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
PL_sv_objcount++;
}
if (PL_in_my == KEY_our) {
(void)SvUPGRADE(sv, SVt_PVGV);
GvSTASH(sv) = (HV*)SvREFCNT_inc(PL_curstash ? (SV*)PL_curstash : (SV*)PL_defstash);
SvFLAGS(sv) |= SVpad_OUR;
}
av_store(PL_comppad_name, off, sv);
SvNVX(sv) = (NV)PAD_MAX;
SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
if (!PL_min_intro_pending)
PL_min_intro_pending = off;
PL_max_intro_pending = off;
if (*name == '@')
av_store(PL_comppad, off, (SV*)newAV());
else if (*name == '%')
av_store(PL_comppad, off, (SV*)newHV());
SvPADMY_on(PL_curpad[off]);
return off;
}
STATIC PADOFFSET
S_pad_addlex(pTHX_ SV *proto_namesv)
{
SV *namesv = NEWSV(1103,0);
PADOFFSET newoff = pad_alloc(OP_PADSV, SVs_PADMY);
sv_upgrade(namesv, SVt_PVNV);
sv_setpv(namesv, SvPVX(proto_namesv));
av_store(PL_comppad_name, newoff, namesv);
SvNVX(namesv) = (NV)PL_curcop->cop_seq;
SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
SvFAKE_on(namesv); /* A ref, not a real var */
if (SvFLAGS(proto_namesv) & SVpad_OUR) { /* An "our" variable */
SvFLAGS(namesv) |= SVpad_OUR;
(void)SvUPGRADE(namesv, SVt_PVGV);
GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)GvSTASH(proto_namesv));
}
if (SvOBJECT(proto_namesv)) { /* A typed var */
SvOBJECT_on(namesv);
(void)SvUPGRADE(namesv, SVt_PVMG);
SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(proto_namesv));
PL_sv_objcount++;
}
return newoff;
}
#define FINDLEX_NOSEARCH 1 /* don't search outer contexts */
STATIC PADOFFSET
S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv,
I32 cx_ix, I32 saweval, U32 flags)
{
dTHR;
CV *cv;
I32 off;
SV *sv;
register I32 i;
register PERL_CONTEXT *cx;
for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
AV *curlist = CvPADLIST(cv);
SV **svp = av_fetch(curlist, 0, FALSE);
AV *curname;
if (!svp || *svp == &PL_sv_undef)
continue;
curname = (AV*)*svp;
svp = AvARRAY(curname);
for (off = AvFILLp(curname); off > 0; off--) {
if ((sv = svp[off]) &&
sv != &PL_sv_undef &&
seq <= SvIVX(sv) &&
seq > I_32(SvNVX(sv)) &&
strEQ(SvPVX(sv), name))
{
I32 depth;
AV *oldpad;
SV *oldsv;
depth = CvDEPTH(cv);
if (!depth) {
if (newoff) {
if (SvFAKE(sv))
continue;
return 0; /* don't clone from inactive stack frame */
}
depth = 1;
}
oldpad = (AV*)AvARRAY(curlist)[depth];
oldsv = *av_fetch(oldpad, off, TRUE);
if (!newoff) { /* Not a mere clone operation. */
newoff = pad_addlex(sv);
if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) {
/* "It's closures all the way down." */
CvCLONE_on(PL_compcv);
if (cv == startcv) {
if (CvANON(PL_compcv))
oldsv = Nullsv; /* no need to keep ref */
}
else {
CV *bcv;
for (bcv = startcv;
bcv && bcv != cv && !CvCLONE(bcv);
bcv = CvOUTSIDE(bcv))
{
if (CvANON(bcv)) {
/* install the missing pad entry in intervening
* nested subs and mark them cloneable.
* XXX fix pad_foo() to not use globals */
AV *ocomppad_name = PL_comppad_name;
AV *ocomppad = PL_comppad;
SV **ocurpad = PL_curpad;
AV *padlist = CvPADLIST(bcv);
PL_comppad_name = (AV*)AvARRAY(padlist)[0];
PL_comppad = (AV*)AvARRAY(padlist)[1];
PL_curpad = AvARRAY(PL_comppad);
pad_addlex(sv);
PL_comppad_name = ocomppad_name;
PL_comppad = ocomppad;
PL_curpad = ocurpad;
CvCLONE_on(bcv);
}
else {
if (ckWARN(WARN_CLOSURE)
&& !CvUNIQUE(bcv) && !CvUNIQUE(cv))
{
Perl_warner(aTHX_ WARN_CLOSURE,
"Variable \"%s\" may be unavailable",
name);
}
break;
}
}
}
}
else if (!CvUNIQUE(PL_compcv)) {
if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv)
&& !(SvFLAGS(sv) & SVpad_OUR))
{
Perl_warner(aTHX_ WARN_CLOSURE,
"Variable \"%s\" will not stay shared", name);
}
}
}
av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv));
return newoff;
}
}
}
if (flags & FINDLEX_NOSEARCH)
return 0;
/* Nothing in current lexical context--try eval's context, if any.
* This is necessary to let the perldb get at lexically scoped variables.
* XXX This will also probably interact badly with eval tree caching.
*/
for (i = cx_ix; i >= 0; i--) {
cx = &cxstack[i];
switch (CxTYPE(cx)) {
default:
if (i == 0 && saweval) {
seq = cxstack[saweval].blk_oldcop->cop_seq;
return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0);
}
break;
case CXt_EVAL:
switch (cx->blk_eval.old_op_type) {
case OP_ENTEREVAL:
if (CxREALEVAL(cx))
saweval = i;
break;
case OP_DOFILE:
case OP_REQUIRE:
/* require/do must have their own scope */
return 0;
}
break;
case CXt_FORMAT:
case CXt_SUB:
if (!saweval)
return 0;
cv = cx->blk_sub.cv;
if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */
saweval = i; /* so we know where we were called from */
continue;
}
seq = cxstack[saweval].blk_oldcop->cop_seq;
return pad_findlex(name, newoff, seq, cv, i-1, saweval,FINDLEX_NOSEARCH);
}
}
return 0;
}
PADOFFSET
Perl_pad_findmy(pTHX_ char *name)
{
dTHR;
I32 off;
I32 pendoff = 0;
SV *sv;
SV **svp = AvARRAY(PL_comppad_name);
U32 seq = PL_cop_seqmax;
PERL_CONTEXT *cx;
CV *outside;
#ifdef USE_THREADS
/*
* Special case to get lexical (and hence per-thread) @_.
* XXX I need to find out how to tell at parse-time whether use
* of @_ should refer to a lexical (from a sub) or defgv (global
* scope and maybe weird sub-ish things like formats). See
* startsub in perly.y. It's possible that @_ could be lexical
* (at least from subs) even in non-threaded perl.
*/
if (strEQ(name, "@_"))
return 0; /* success. (NOT_IN_PAD indicates failure) */
#endif /* USE_THREADS */
/* The one we're looking for is probably just before comppad_name_fill. */
for (off = AvFILLp(PL_comppad_name); off > 0; off--) {
if ((sv = svp[off]) &&
sv != &PL_sv_undef &&
(!SvIVX(sv) ||
(seq <= SvIVX(sv) &&
seq > I_32(SvNVX(sv)))) &&
strEQ(SvPVX(sv), name))
{
if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR)
return (PADOFFSET)off;
pendoff = off; /* this pending def. will override import */
}
}
outside = CvOUTSIDE(PL_compcv);
/* Check if if we're compiling an eval'', and adjust seq to be the
* eval's seq number. This depends on eval'' having a non-null
* CvOUTSIDE() while it is being compiled. The eval'' itself is
* identified by CvEVAL being true and CvGV being null. */
if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) {
cx = &cxstack[cxstack_ix];
if (CxREALEVAL(cx))
seq = cx->blk_oldcop->cop_seq;
}
/* See if it's in a nested scope */
off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0);
if (off) {
/* If there is a pending local definition, this new alias must die */
if (pendoff)
SvIVX(AvARRAY(PL_comppad_name)[off]) = seq;
return off; /* pad_findlex returns 0 for failure...*/
}
return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */
}
void
Perl_pad_leavemy(pTHX_ I32 fill)
{
dTHR;
I32 off;
SV **svp = AvARRAY(PL_comppad_name);
SV *sv;
if (PL_min_intro_pending && fill < PL_min_intro_pending) {
for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) {
if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL))
Perl_warner(aTHX_ WARN_INTERNAL, "%s never introduced", SvPVX(sv));
}
}
/* "Deintroduce" my variables that are leaving with this scope. */
for (off = AvFILLp(PL_comppad_name); off > fill; off--) {
if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX)
SvIVX(sv) = PL_cop_seqmax;
}
}
PADOFFSET
Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
{
dTHR;
SV *sv;
I32 retval;
if (AvARRAY(PL_comppad) != PL_curpad)
Perl_croak(aTHX_ "panic: pad_alloc");
if (PL_pad_reset_pending)
pad_reset();
if (tmptype & SVs_PADMY) {
do {
sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE);
} while (SvPADBUSY(sv)); /* need a fresh one */
retval = AvFILLp(PL_comppad);
}
else {
SV **names = AvARRAY(PL_comppad_name);
SSize_t names_fill = AvFILLp(PL_comppad_name);
for (;;) {
/*
* "foreach" index vars temporarily become aliases to non-"my"
* values. Thus we must skip, not just pad values that are
* marked as current pad values, but also those with names.
*/
if (++PL_padix <= names_fill &&
(sv = names[PL_padix]) && sv != &PL_sv_undef)
continue;
sv = *av_fetch(PL_comppad, PL_padix, TRUE);
if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)) && !IS_PADGV(sv))
break;
}
retval = PL_padix;
}
SvFLAGS(sv) |= tmptype;
PL_curpad = AvARRAY(PL_comppad);
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log,
"0x%"UVxf" Pad 0x%"UVxf" alloc %ld for %s\n",
PTR2UV(thr), PTR2UV(PL_curpad),
(long) retval, PL_op_name[optype]));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log,
"Pad 0x%"UVxf" alloc %ld for %s\n",
PTR2UV(PL_curpad),
(long) retval, PL_op_name[optype]));
#endif /* USE_THREADS */
return (PADOFFSET)retval;
}
SV *
Perl_pad_sv(pTHX_ PADOFFSET po)
{
dTHR;
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log,
"0x%"UVxf" Pad 0x%"UVxf" sv %"IVdf"\n",
PTR2UV(thr), PTR2UV(PL_curpad), (IV)po));
#else
if (!po)
Perl_croak(aTHX_ "panic: pad_sv po");
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" sv %"IVdf"\n",
PTR2UV(PL_curpad), (IV)po));
#endif /* USE_THREADS */
return PL_curpad[po]; /* eventually we'll turn this into a macro */
}
void
Perl_pad_free(pTHX_ PADOFFSET po)
{
dTHR;
if (!PL_curpad)
return;
if (AvARRAY(PL_comppad) != PL_curpad)
Perl_croak(aTHX_ "panic: pad_free curpad");
if (!po)
Perl_croak(aTHX_ "panic: pad_free po");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log,
"0x%"UVxf" Pad 0x%"UVxf" free %"IVdf"\n",
PTR2UV(thr), PTR2UV(PL_curpad), (IV)po));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" free %"IVdf"\n",
PTR2UV(PL_curpad), (IV)po));
#endif /* USE_THREADS */
if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) {
SvPADTMP_off(PL_curpad[po]);
#ifdef USE_ITHREADS
SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */
#endif
}
if ((I32)po < PL_padix)
PL_padix = po - 1;
}
void
Perl_pad_swipe(pTHX_ PADOFFSET po)
{
dTHR;
if (AvARRAY(PL_comppad) != PL_curpad)
Perl_croak(aTHX_ "panic: pad_swipe curpad");
if (!po)
Perl_croak(aTHX_ "panic: pad_swipe po");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log,
"0x%"UVxf" Pad 0x%"UVxf" swipe %"IVdf"\n",
PTR2UV(thr), PTR2UV(PL_curpad), (IV)po));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" swipe %"IVdf"\n",
PTR2UV(PL_curpad), (IV)po));
#endif /* USE_THREADS */
SvPADTMP_off(PL_curpad[po]);
PL_curpad[po] = NEWSV(1107,0);
SvPADTMP_on(PL_curpad[po]);
if ((I32)po < PL_padix)
PL_padix = po - 1;
}
/* XXX pad_reset() is currently disabled because it results in serious bugs.
* It causes pad temp TARGs to be shared between OPs. Since TARGs are pushed
* on the stack by OPs that use them, there are several ways to get an alias
* to a shared TARG. Such an alias will change randomly and unpredictably.
* We avoid doing this until we can think of a Better Way.
* GSAR 97-10-29 */
void
Perl_pad_reset(pTHX)
{
#ifdef USE_BROKEN_PAD_RESET
dTHR;
register I32 po;
if (AvARRAY(PL_comppad) != PL_curpad)
Perl_croak(aTHX_ "panic: pad_reset curpad");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log,
"0x%"UVxf" Pad 0x%"UVxf" reset\n",
PTR2UV(thr), PTR2UV(PL_curpad)));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" reset\n",
PTR2UV(PL_curpad)));
#endif /* USE_THREADS */
if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */
for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po]))
SvPADTMP_off(PL_curpad[po]);
}
PL_padix = PL_padix_floor;
}
#endif
PL_pad_reset_pending = FALSE;
}
#ifdef USE_THREADS
/* find_threadsv is not reentrant */
PADOFFSET
Perl_find_threadsv(pTHX_ const char *name)
{
dTHR;
char *p;
PADOFFSET key;
SV **svp;
/* We currently only handle names of a single character */
p = strchr(PL_threadsv_names, *name);
if (!p)
return NOT_IN_PAD;
key = p - PL_threadsv_names;
MUTEX_LOCK(&thr->mutex);
svp = av_fetch(thr->threadsv, key, FALSE);
if (svp)
MUTEX_UNLOCK(&thr->mutex);
else {
SV *sv = NEWSV(0, 0);
av_store(thr->threadsv, key, sv);
thr->threadsvp = AvARRAY(thr->threadsv);
MUTEX_UNLOCK(&thr->mutex);
/*
* Some magic variables used to be automagically initialised
* in gv_fetchpv. Those which are now per-thread magicals get
* initialised here instead.
*/
switch (*name) {
case '_':
break;
case ';':
sv_setpv(sv, "\034");
sv_magic(sv, 0, 0, name, 1);
break;
case '&':
case '`':
case '\'':
PL_sawampersand = TRUE;
/* FALL THROUGH */
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
SvREADONLY_on(sv);
/* FALL THROUGH */
/* XXX %! tied to Errno.pm needs to be added here.
* See gv_fetchpv(). */
/* case '!': */
default:
sv_magic(sv, 0, 0, name, 1);
}
DEBUG_S(PerlIO_printf(Perl_error_log,
"find_threadsv: new SV %p for $%s%c\n",
sv, (*name < 32) ? "^" : "",
(*name < 32) ? toCTRL(*name) : *name));
}
return key;
}
#endif /* USE_THREADS */
/* Destructor */
void
Perl_op_free(pTHX_ OP *o)
{
register OP *kid, *nextkid;
OPCODE type;
if (!o || o->op_seq == (U16)-1)
return;
if (o->op_private & OPpREFCOUNTED) {
switch (o->op_type) {
case OP_LEAVESUB:
case OP_LEAVESUBLV:
case OP_LEAVEEVAL:
case OP_LEAVE:
case OP_SCOPE:
case OP_LEAVEWRITE:
OP_REFCNT_LOCK;
if (OpREFCNT_dec(o)) {
OP_REFCNT_UNLOCK;
return;
}
OP_REFCNT_UNLOCK;
break;
default:
break;
}
}
if (o->op_flags & OPf_KIDS) {
for (kid = cUNOPo->op_first; kid; kid = nextkid) {
nextkid = kid->op_sibling; /* Get before next freeing kid */
op_free(kid);
}
}
type = o->op_type;
if (type == OP_NULL)
type = o->op_targ;
/* COP* is not cleared by op_clear() so that we may track line
* numbers etc even after null() */
if (type == OP_NEXTSTATE || type == OP_SETSTATE || type == OP_DBSTATE)
cop_free((COP*)o);
op_clear(o);
#ifdef PL_OP_SLAB_ALLOC
if ((char *) o == PL_OpPtr)
{
}
#else
Safefree(o);
#endif
}
STATIC void
S_op_clear(pTHX_ OP *o)
{
switch (o->op_type) {
case OP_NULL: /* Was holding old type, if any. */
case OP_ENTEREVAL: /* Was holding hints. */
#ifdef USE_THREADS
case OP_THREADSV: /* Was holding index into thr->threadsv AV. */
#endif
o->op_targ = 0;
break;
#ifdef USE_THREADS
case OP_ENTERITER:
if (!(o->op_flags & OPf_SPECIAL))
break;
/* FALL THROUGH */
#endif /* USE_THREADS */
default:
if (!(o->op_flags & OPf_REF)
|| (PL_check[o->op_type] != MEMBER_TO_FPTR(Perl_ck_ftst)))
break;
/* FALL THROUGH */
case OP_GVSV:
case OP_GV:
case OP_AELEMFAST:
#ifdef USE_ITHREADS
if (cPADOPo->op_padix > 0) {
if (PL_curpad) {
GV *gv = cGVOPo_gv;
pad_swipe(cPADOPo->op_padix);
/* No GvIN_PAD_off(gv) here, because other references may still
* exist on the pad */
SvREFCNT_dec(gv);
}
cPADOPo->op_padix = 0;
}
#else
SvREFCNT_dec(cSVOPo->op_sv);
cSVOPo->op_sv = Nullsv;
#endif
break;
case OP_METHOD_NAMED:
case OP_CONST:
SvREFCNT_dec(cSVOPo->op_sv);
cSVOPo->op_sv = Nullsv;
break;
case OP_GOTO:
case OP_NEXT:
case OP_LAST:
case OP_REDO:
if (o->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
break;
/* FALL THROUGH */
case OP_TRANS:
if (o->op_private & (OPpTRANS_FROM_UTF|OPpTRANS_TO_UTF)) {
SvREFCNT_dec(cSVOPo->op_sv);
cSVOPo->op_sv = Nullsv;
}
else {
Safefree(cPVOPo->op_pv);
cPVOPo->op_pv = Nullch;
}
break;
case OP_SUBST:
op_free(cPMOPo->op_pmreplroot);
goto clear_pmop;
case OP_PUSHRE:
#ifdef USE_ITHREADS
if ((PADOFFSET)cPMOPo->op_pmreplroot) {
if (PL_curpad) {
GV *gv = (GV*)PL_curpad[(PADOFFSET)cPMOPo->op_pmreplroot];
pad_swipe((PADOFFSET)cPMOPo->op_pmreplroot);
/* No GvIN_PAD_off(gv) here, because other references may still
* exist on the pad */
SvREFCNT_dec(gv);
}
}
#else
SvREFCNT_dec((SV*)cPMOPo->op_pmreplroot);
#endif
/* FALL THROUGH */
case OP_MATCH:
case OP_QR:
clear_pmop:
cPMOPo->op_pmreplroot = Nullop;
ReREFCNT_dec(cPMOPo->op_pmregexp);
cPMOPo->op_pmregexp = (REGEXP*)NULL;
break;
}
if (o->op_targ > 0) {
pad_free(o->op_targ);
o->op_targ = 0;
}
}
STATIC void
S_cop_free(pTHX_ COP* cop)
{
Safefree(cop->cop_label);
#ifdef USE_ITHREADS
Safefree(CopFILE(cop)); /* XXX share in a pvtable? */
Safefree(CopSTASHPV(cop)); /* XXX share in a pvtable? */
#else
/* NOTE: COP.cop_stash is not refcounted */
SvREFCNT_dec(CopFILEGV(cop));
#endif
if (! specialWARN(cop->cop_warnings))
SvREFCNT_dec(cop->cop_warnings);
}
STATIC void
S_null(pTHX_ OP *o)
{
if (o->op_type == OP_NULL)
return;
op_clear(o);
o->op_targ = o->op_type;
o->op_type = OP_NULL;
o->op_ppaddr = PL_ppaddr[OP_NULL];
}
/* Contextualizers */
#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
OP *
Perl_linklist(pTHX_ OP *o)
{
register OP *kid;
if (o->op_next)
return o->op_next;
/* establish postfix order */
if (cUNOPo->op_first) {
o->op_next = LINKLIST(cUNOPo->op_first);
for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling)
kid->op_next = LINKLIST(kid->op_sibling);
else
kid->op_next = o;
}
}
else
o->op_next = o;
return o->op_next;
}
OP *
Perl_scalarkids(pTHX_ OP *o)
{
OP *kid;
if (o && o->op_flags & OPf_KIDS) {
for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
scalar(kid);
}
return o;
}
STATIC OP *
S_scalarboolean(pTHX_ OP *o)
{
if (o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
dTHR;
if (ckWARN(WARN_SYNTAX)) {
line_t oldline = CopLINE(PL_curcop);
if (PL_copline != NOLINE)
CopLINE_set(PL_curcop, PL_copline);
Perl_warner(aTHX_ WARN_SYNTAX, "Found = in conditional, should be ==");
CopLINE_set(PL_curcop, oldline);
}
}
return scalar(o);
}
OP *
Perl_scalar(pTHX_ OP *o)
{
OP *kid;
/* assumes no premature commitment */
if (!o || (o->op_flags & OPf_WANT) || PL_error_count
|| o->op_type == OP_RETURN)
{
return o;
}
o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_SCALAR;
switch (o->op_type) {
case OP_REPEAT:
if (o->op_private & OPpREPEAT_DOLIST)
null(((LISTOP*)cBINOPo->op_first)->op_first);
scalar(cBINOPo->op_first);
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
scalar(kid);
break;
case OP_SPLIT:
if ((kid = cLISTOPo->op_first) && kid->op_type == OP_PUSHRE) {
if (!kPMOP->op_pmreplroot)
deprecate("implicit split to @_");
}
/* FALL THROUGH */
case OP_MATCH:
case OP_QR:
case OP_SUBST:
case OP_NULL:
default:
if (o->op_flags & OPf_KIDS) {
for (kid = cUNOPo->op_first; kid; kid = kid->op_sibling)
scalar(kid);
}
break;
case OP_LEAVE:
case OP_LEAVETRY:
kid = cLISTOPo->op_first;
scalar(kid);
while ((kid = kid->op_sibling)) {
if (kid->op_sibling)
scalarvoid(kid);
else
scalar(kid);
}
WITH_THR(PL_curcop = &PL_compiling);
break;
case OP_SCOPE:
case OP_LINESEQ:
case OP_LIST:
for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling)
scalarvoid(kid);
else
scalar(kid);
}
WITH_THR(PL_curcop = &PL_compiling);
break;
}
return o;
}
OP *
Perl_scalarvoid(pTHX_ OP *o)
{
OP *kid;
char* useless = 0;
SV* sv;
U8 want;