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op.c
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op.c
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/* op.c
*
* Copyright (c) 1991-1999, 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"
#include "perl.h"
#ifdef PERL_OBJECT
#define CHECKCALL this->*check
#else
#define CHECKCALL *check
#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), \
croak("%s trapped by operation mask", op_desc[type]), \
Nullop ) \
: (CHECKCALL[type])((OP*)o))
#define PAD_MAX 999999999
static bool scalar_mod_type _((OP *o, I32 type));
#ifndef PERL_OBJECT
static I32 list_assignment _((OP *o));
static void bad_type _((I32 n, char *t, char *name, OP *kid));
static OP *modkids _((OP *o, I32 type));
static OP *no_fh_allowed _((OP *o));
static void no_bareword_allowed _((OP *o));
static OP *scalarboolean _((OP *o));
static OP *too_few_arguments _((OP *o, char* name));
static OP *too_many_arguments _((OP *o, char* name));
static void null _((OP* o));
static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
CV* startcv, I32 cx_ix, I32 saweval, U32 flags));
static OP *newDEFSVOP _((void));
static OP *new_logop _((I32 type, I32 flags, OP **firstp, OP **otherp));
#endif
STATIC char*
gv_ename(GV *gv)
{
SV* tmpsv = sv_newmortal();
STRLEN n_a;
gv_efullname3(tmpsv, gv, Nullch);
return SvPV(tmpsv,n_a);
}
STATIC OP *
no_fh_allowed(OP *o)
{
yyerror(form("Missing comma after first argument to %s function",
op_desc[o->op_type]));
return o;
}
STATIC OP *
too_few_arguments(OP *o, char *name)
{
yyerror(form("Not enough arguments for %s", name));
return o;
}
STATIC OP *
too_many_arguments(OP *o, char *name)
{
yyerror(form("Too many arguments for %s", name));
return o;
}
STATIC void
bad_type(I32 n, char *t, char *name, OP *kid)
{
yyerror(form("Type of arg %d to %s must be %s (not %s)",
(int)n, name, t, op_desc[kid->op_type]));
}
STATIC void
no_bareword_allowed(OP *o)
{
STRLEN n_a;
warn("Bareword \"%s\" not allowed while \"strict subs\" in use",
SvPV(cSVOPo->op_sv, n_a));
++PL_error_count;
}
void
assertref(OP *o)
{
int type = o->op_type;
if (type != OP_AELEM && type != OP_HELEM && type != OP_GELEM) {
yyerror(form("Can't use subscript on %s", op_desc[type]));
if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV) {
dTHR;
SV *msg = sv_2mortal(
newSVpvf("(Did you mean $ or @ instead of %c?)\n",
type == OP_ENTERSUB ? '&' : '%'));
if (PL_in_eval & 2)
warn("%_", msg);
else if (PL_in_eval)
sv_catsv(GvSV(PL_errgv), msg);
else
PerlIO_write(PerlIO_stderr(), SvPVX(msg), SvCUR(msg));
}
}
}
/* "register" allocation */
PADOFFSET
pad_allocmy(char *name)
{
dTHR;
PADOFFSET off;
SV *sv;
if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
if (!isPRINT(name[1])) {
name[3] = '\0';
name[2] = toCTRL(name[1]);
name[1] = '^';
}
yyerror(form("Can't use global %s in \"my\"",name));
}
if (PL_dowarn && AvFILLp(PL_comppad_name) >= 0) {
SV **svp = AvARRAY(PL_comppad_name);
for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_floor; off--) {
if ((sv = svp[off])
&& sv != &PL_sv_undef
&& (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0)
&& strEQ(name, SvPVX(sv)))
{
warn("\"my\" variable %s masks earlier declaration in same %s",
name, (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
break;
}
}
}
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(form("Can't declare class for non-scalar %s in \"my\"",
name));
SvOBJECT_on(sv);
(void)SvUPGRADE(sv, SVt_PVMG);
SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
PL_sv_objcount++;
}
av_store(PL_comppad_name, off, sv);
SvNVX(sv) = (double)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;
}
#define FINDLEX_NOSEARCH 1 /* don't search outer contexts */
STATIC PADOFFSET
pad_findlex(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*)*av_fetch(curlist, depth, FALSE);
oldsv = *av_fetch(oldpad, off, TRUE);
if (!newoff) { /* Not a mere clone operation. */
SV *namesv = NEWSV(1103,0);
newoff = pad_alloc(OP_PADSV, SVs_PADMY);
sv_upgrade(namesv, SVt_PVNV);
sv_setpv(namesv, name);
av_store(PL_comppad_name, newoff, namesv);
SvNVX(namesv) = (double)PL_curcop->cop_seq;
SvIVX(namesv) = PAD_MAX; /* A ref, intro immediately */
SvFAKE_on(namesv); /* A ref, not a real var */
if (SvOBJECT(svp[off])) { /* A typed var */
SvOBJECT_on(namesv);
(void)SvUPGRADE(namesv, SVt_PVMG);
SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*)SvSTASH(svp[off]));
PL_sv_objcount++;
}
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))
CvCLONE_on(bcv);
else {
if (PL_dowarn
&& !CvUNIQUE(bcv) && !CvUNIQUE(cv))
{
warn(
"Variable \"%s\" may be unavailable",
name);
}
break;
}
}
}
}
else if (!CvUNIQUE(PL_compcv)) {
if (PL_dowarn && !SvFAKE(sv) && !CvUNIQUE(cv))
warn("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_REQUIRE:
/* require must have its own scope */
return 0;
}
break;
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
pad_findmy(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))
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
pad_leavemy(I32 fill)
{
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)
warn("%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
pad_alloc(I32 optype, U32 tmptype)
{
dTHR;
SV *sv;
I32 retval;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("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)))
break;
}
retval = PL_padix;
}
SvFLAGS(sv) |= tmptype;
PL_curpad = AvARRAY(PL_comppad);
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
(unsigned long) thr, (unsigned long) PL_curpad,
(long) retval, op_name[optype]));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
(unsigned long) PL_curpad,
(long) retval, op_name[optype]));
#endif /* USE_THREADS */
return (PADOFFSET)retval;
}
SV *
pad_sv(PADOFFSET po)
{
dTHR;
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
(unsigned long) thr, (unsigned long) PL_curpad, po));
#else
if (!po)
croak("panic: pad_sv po");
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
(unsigned long) PL_curpad, po));
#endif /* USE_THREADS */
return PL_curpad[po]; /* eventually we'll turn this into a macro */
}
void
pad_free(PADOFFSET po)
{
dTHR;
if (!PL_curpad)
return;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("panic: pad_free curpad");
if (!po)
croak("panic: pad_free po");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
(unsigned long) thr, (unsigned long) PL_curpad, po));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
(unsigned long) PL_curpad, po));
#endif /* USE_THREADS */
if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
SvPADTMP_off(PL_curpad[po]);
if ((I32)po < PL_padix)
PL_padix = po - 1;
}
void
pad_swipe(PADOFFSET po)
{
dTHR;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("panic: pad_swipe curpad");
if (!po)
croak("panic: pad_swipe po");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
(unsigned long) thr, (unsigned long) PL_curpad, po));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
(unsigned long) PL_curpad, 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
pad_reset(void)
{
#ifdef USE_BROKEN_PAD_RESET
dTHR;
register I32 po;
if (AvARRAY(PL_comppad) != PL_curpad)
croak("panic: pad_reset curpad");
#ifdef USE_THREADS
DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
(unsigned long) thr, (unsigned long) PL_curpad));
#else
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
(unsigned long) 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
find_threadsv(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(PerlIO_stderr(),
"find_threadsv: new SV %p for $%s%c\n",
sv, (*name < 32) ? "^" : "",
(*name < 32) ? toCTRL(*name) : *name));
}
return key;
}
#endif /* USE_THREADS */
/* Destructor */
void
op_free(OP *o)
{
register OP *kid, *nextkid;
if (!o || o->op_seq == (U16)-1)
return;
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);
}
}
switch (o->op_type) {
case OP_NULL:
o->op_targ = 0; /* Was holding old type, if any. */
break;
case OP_ENTEREVAL:
o->op_targ = 0; /* Was holding hints. */
break;
#ifdef USE_THREADS
case OP_ENTERITER:
if (!(o->op_flags & OPf_SPECIAL))
break;
/* FALL THROUGH */
case OP_THREADSV:
o->op_targ = 0; /* Was holding index into thr->threadsv AV. */
break;
#endif /* USE_THREADS */
default:
if (!(o->op_flags & OPf_REF)
|| (check[o->op_type] != FUNC_NAME_TO_PTR(ck_ftst)))
break;
/* FALL THROUGH */
case OP_GVSV:
case OP_GV:
case OP_AELEMFAST:
SvREFCNT_dec(cGVOPo->op_gv);
break;
case OP_NEXTSTATE:
case OP_DBSTATE:
Safefree(cCOPo->cop_label);
SvREFCNT_dec(cCOPo->cop_filegv);
break;
case OP_CONST:
SvREFCNT_dec(cSVOPo->op_sv);
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:
Safefree(cPVOPo->op_pv);
break;
case OP_SUBST:
op_free(cPMOPo->op_pmreplroot);
/* FALL THROUGH */
case OP_PUSHRE:
case OP_MATCH:
case OP_QR:
ReREFCNT_dec(cPMOPo->op_pmregexp);
break;
}
if (o->op_targ > 0)
pad_free(o->op_targ);
Safefree(o);
}
STATIC void
null(OP *o)
{
if (o->op_type != OP_NULL && o->op_type != OP_THREADSV && o->op_targ > 0)
pad_free(o->op_targ);
o->op_targ = o->op_type;
o->op_type = OP_NULL;
o->op_ppaddr = ppaddr[OP_NULL];
}
/* Contextualizers */
#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
OP *
linklist(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 *
scalarkids(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 *
scalarboolean(OP *o)
{
if (PL_dowarn &&
o->op_type == OP_SASSIGN && cBINOPo->op_first->op_type == OP_CONST) {
dTHR;
line_t oldline = PL_curcop->cop_line;
if (PL_copline != NOLINE)
PL_curcop->cop_line = PL_copline;
warn("Found = in conditional, should be ==");
PL_curcop->cop_line = oldline;
}
return scalar(o);
}
OP *
scalar(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 *
scalarvoid(OP *o)
{
OP *kid;
char* useless = 0;
SV* sv;
/* assumes no premature commitment */
U8 want = o->op_flags & OPf_WANT;
if (!o || (want && want != OPf_WANT_SCALAR) || PL_error_count
|| o->op_type == OP_RETURN)
return o;
o->op_flags = (o->op_flags & ~OPf_WANT) | OPf_WANT_VOID;
switch (o->op_type) {
default:
if (!(opargs[o->op_type] & OA_FOLDCONST))
break;
/* FALL THROUGH */
case OP_REPEAT:
if (o->op_flags & OPf_STACKED)
break;
goto func_ops;
case OP_SUBSTR:
if (o->op_private == 4)
break;
/* FALL THROUGH */
case OP_GVSV:
case OP_WANTARRAY:
case OP_GV:
case OP_PADSV:
case OP_PADAV:
case OP_PADHV:
case OP_PADANY:
case OP_AV2ARYLEN:
case OP_REF:
case OP_REFGEN:
case OP_SREFGEN:
case OP_DEFINED:
case OP_HEX:
case OP_OCT:
case OP_LENGTH:
case OP_VEC:
case OP_INDEX:
case OP_RINDEX:
case OP_SPRINTF:
case OP_AELEM:
case OP_AELEMFAST:
case OP_ASLICE:
case OP_HELEM:
case OP_HSLICE:
case OP_UNPACK:
case OP_PACK:
case OP_JOIN:
case OP_LSLICE:
case OP_ANONLIST:
case OP_ANONHASH:
case OP_SORT:
case OP_REVERSE:
case OP_RANGE:
case OP_FLIP:
case OP_FLOP:
case OP_CALLER:
case OP_FILENO:
case OP_EOF:
case OP_TELL:
case OP_GETSOCKNAME:
case OP_GETPEERNAME:
case OP_READLINK:
case OP_TELLDIR:
case OP_GETPPID:
case OP_GETPGRP:
case OP_GETPRIORITY:
case OP_TIME:
case OP_TMS:
case OP_LOCALTIME:
case OP_GMTIME:
case OP_GHBYNAME:
case OP_GHBYADDR:
case OP_GHOSTENT:
case OP_GNBYNAME:
case OP_GNBYADDR:
case OP_GNETENT:
case OP_GPBYNAME:
case OP_GPBYNUMBER:
case OP_GPROTOENT:
case OP_GSBYNAME:
case OP_GSBYPORT:
case OP_GSERVENT:
case OP_GPWNAM:
case OP_GPWUID:
case OP_GGRNAM:
case OP_GGRGID:
case OP_GETLOGIN:
func_ops:
if (!(o->op_private & OPpLVAL_INTRO))
useless = op_desc[o->op_type];
break;
case OP_RV2GV:
case OP_RV2SV:
case OP_RV2AV:
case OP_RV2HV:
if (!(o->op_private & OPpLVAL_INTRO) &&
(!o->op_sibling || o->op_sibling->op_type != OP_READLINE))
useless = "a variable";
break;
case OP_NEXTSTATE:
case OP_DBSTATE:
WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
break;
case OP_CONST:
sv = cSVOPo->op_sv;
if (cSVOPo->op_private & OPpCONST_STRICT)
no_bareword_allowed(o);
else if (PL_dowarn) {
useless = "a constant";
if (SvNIOK(sv) && (SvNV(sv) == 0.0 || SvNV(sv) == 1.0))
useless = 0;
else if (SvPOK(sv)) {
if (strnEQ(SvPVX(sv), "di", 2) ||
strnEQ(SvPVX(sv), "ds", 2) ||
strnEQ(SvPVX(sv), "ig", 2))
useless = 0;
}
}
null(o); /* don't execute a constant */
SvREFCNT_dec(sv); /* don't even remember it */
break;
case OP_POSTINC:
o->op_type = OP_PREINC; /* pre-increment is faster */
o->op_ppaddr = ppaddr[OP_PREINC];
break;
case OP_POSTDEC:
o->op_type = OP_PREDEC; /* pre-decrement is faster */
o->op_ppaddr = ppaddr[OP_PREDEC];
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOPo->op_first->op_sibling; kid; kid = kid->op_sibling)
scalarvoid(kid);
break;
case OP_NULL:
if (o->op_targ == OP_NEXTSTATE || o->op_targ == OP_DBSTATE)
WITH_THR(PL_curcop = ((COP*)o)); /* for warning below */
if (o->op_flags & OPf_STACKED)
break;
/* FALL THROUGH */
case OP_ENTERTRY:
case OP_ENTER:
case OP_SCALAR:
if (!(o->op_flags & OPf_KIDS))
break;
/* FALL THROUGH */
case OP_SCOPE:
case OP_LEAVE:
case OP_LEAVETRY:
case OP_LEAVELOOP:
case OP_LINESEQ:
case OP_LIST:
for (kid = cLISTOPo->op_first; kid; kid = kid->op_sibling)
scalarvoid(kid);
break;
case OP_ENTEREVAL:
scalarkids(o);
break;