forked from schacon/perl
/
op.c
4506 lines (4072 loc) · 95.6 KB
/
op.c
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/* op.c
*
* Copyright (c) 1991-1994, 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"
#define USE_OP_MASK /* Turned on by default in 5.002beta1h */
#ifdef USE_OP_MASK
/*
* In the following definition, the ", (OP *) op" is just to make the compiler
* think the expression is of the right type: croak actually does a Siglongjmp.
*/
#define CHECKOP(type,op) \
((op_mask && op_mask[type]) \
? ( op_free((OP*)op), \
croak("%s trapped by operation mask", op_desc[type]), \
Nullop ) \
: (*check[type])((OP*)op))
#else
#define CHECKOP(type,op) (*check[type])(op)
#endif /* USE_OP_MASK */
static I32 list_assignment _((OP *op));
static OP *bad_type _((I32 n, char *t, char *name, OP *kid));
static OP *modkids _((OP *op, I32 type));
static OP *no_fh_allowed _((OP *op));
static OP *scalarboolean _((OP *op));
static OP *too_few_arguments _((OP *op, char* name));
static OP *too_many_arguments _((OP *op, char* name));
static void null _((OP* op));
static PADOFFSET pad_findlex _((char* name, PADOFFSET newoff, U32 seq,
CV* startcv, I32 cx_ix));
static char*
CvNAME(cv)
CV* cv;
{
SV* tmpsv = sv_newmortal();
gv_efullname3(tmpsv, CvGV(cv), Nullch);
return SvPV(tmpsv,na);
}
static OP *
no_fh_allowed(op)
OP *op;
{
sprintf(tokenbuf,"Missing comma after first argument to %s function",
op_desc[op->op_type]);
yyerror(tokenbuf);
return op;
}
static OP *
too_few_arguments(op, name)
OP* op;
char* name;
{
sprintf(tokenbuf,"Not enough arguments for %s", name);
yyerror(tokenbuf);
return op;
}
static OP *
too_many_arguments(op, name)
OP *op;
char* name;
{
sprintf(tokenbuf,"Too many arguments for %s", name);
yyerror(tokenbuf);
return op;
}
static OP *
bad_type(n, t, name, kid)
I32 n;
char *t;
char *name;
OP *kid;
{
sprintf(tokenbuf, "Type of arg %d to %s must be %s (not %s)",
(int) n, name, t, op_desc[kid->op_type]);
yyerror(tokenbuf);
return op;
}
void
assertref(op)
OP *op;
{
int type = op->op_type;
if (type != OP_AELEM && type != OP_HELEM) {
sprintf(tokenbuf, "Can't use subscript on %s", op_desc[type]);
yyerror(tokenbuf);
if (type == OP_ENTERSUB || type == OP_RV2HV || type == OP_PADHV)
warn("(Did you mean $ or @ instead of %c?)\n",
type == OP_ENTERSUB ? '&' : '%');
}
}
/* "register" allocation */
PADOFFSET
pad_allocmy(name)
char *name;
{
PADOFFSET off;
SV *sv;
if (!(isALPHA(name[1]) || name[1] == '_' && (int)strlen(name) > 2)) {
if (!isPRINT(name[1]))
sprintf(name+1, "^%c", toCTRL(name[1])); /* XXX tokenbuf, really */
croak("Can't use global %s in \"my\"",name);
}
if (AvFILL(comppad_name) >= 0) {
SV **svp = AvARRAY(comppad_name);
for (off = AvFILL(comppad_name); off > comppad_name_floor; off--) {
if ((sv = svp[off])
&& sv != &sv_undef
&& SvIVX(sv) == 999999999 /* var is in open scope */
&& strEQ(name, SvPVX(sv)))
{
warn("\"my\" variable %s masks earlier declaration in same scope", name);
break;
}
}
}
off = pad_alloc(OP_PADSV, SVs_PADMY);
sv = NEWSV(1102,0);
sv_upgrade(sv, SVt_PVNV);
sv_setpv(sv, name);
av_store(comppad_name, off, sv);
SvNVX(sv) = (double)999999999;
SvIVX(sv) = 0; /* Not yet introduced--see newSTATEOP */
if (!min_intro_pending)
min_intro_pending = off;
max_intro_pending = off;
if (*name == '@')
av_store(comppad, off, (SV*)newAV());
else if (*name == '%')
av_store(comppad, off, (SV*)newHV());
SvPADMY_on(curpad[off]);
return off;
}
static PADOFFSET
#ifndef CAN_PROTOTYPE
pad_findlex(name, newoff, seq, startcv, cx_ix)
char *name;
PADOFFSET newoff;
U32 seq;
CV* startcv;
I32 cx_ix;
#else
pad_findlex(char *name, PADOFFSET newoff, U32 seq, CV* startcv, I32 cx_ix)
#endif
{
CV *cv;
I32 off;
SV *sv;
register I32 i;
register CONTEXT *cx;
int saweval;
for (cv = startcv; cv; cv = CvOUTSIDE(cv)) {
AV* curlist = CvPADLIST(cv);
SV** svp = av_fetch(curlist, 0, FALSE);
AV *curname;
if (!svp || *svp == &sv_undef)
continue;
curname = (AV*)*svp;
svp = AvARRAY(curname);
for (off = AvFILL(curname); off > 0; off--) {
if ((sv = svp[off]) &&
sv != &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 && !CvUNIQUE(cv))
return 0; /* don't clone inactive sub's 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 *sv = NEWSV(1103,0);
newoff = pad_alloc(OP_PADSV, SVs_PADMY);
sv_upgrade(sv, SVt_PVNV);
sv_setpv(sv, name);
av_store(comppad_name, newoff, sv);
SvNVX(sv) = (double)curcop->cop_seq;
SvIVX(sv) = 999999999; /* A ref, intro immediately */
SvFLAGS(sv) |= SVf_FAKE;
if (CvANON(compcv)) {
/* "It's closures all the way down." */
CvCLONE_on(compcv);
if (cv != startcv) {
CV *bcv;
for (bcv = startcv;
bcv && bcv != cv && !CvCLONE(bcv);
bcv = CvOUTSIDE(bcv)) {
if (CvANON(bcv))
CvCLONE_on(bcv);
else {
if (dowarn)
warn("Value of %s may be unavailable",
name);
break;
}
}
}
}
else {
if (dowarn && !CvUNIQUE(cv))
warn("Value of %s will not stay shared", name);
}
}
av_store(comppad, newoff, SvREFCNT_inc(oldsv));
return newoff;
}
}
}
/* 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.
*/
saweval = 0;
for (i = cx_ix; i >= 0; i--) {
cx = &cxstack[i];
switch (cx->cx_type) {
default:
if (i == 0 && saweval) {
seq = cxstack[saweval].blk_oldcop->cop_seq;
return pad_findlex(name, newoff, seq, main_cv, 0);
}
break;
case CXt_EVAL:
if (cx->blk_eval.old_op_type != OP_ENTEREVAL &&
cx->blk_eval.old_op_type != OP_ENTERTRY)
return 0; /* require must have its own scope */
saweval = i;
break;
case CXt_SUB:
if (!saweval)
return 0;
cv = cx->blk_sub.cv;
if (debstash && CvSTASH(cv) == 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);
}
}
return 0;
}
PADOFFSET
pad_findmy(name)
char *name;
{
I32 off;
SV *sv;
SV **svp = AvARRAY(comppad_name);
U32 seq = cop_seqmax;
/* The one we're looking for is probably just before comppad_name_fill. */
for (off = AvFILL(comppad_name); off > 0; off--) {
if ((sv = svp[off]) &&
sv != &sv_undef &&
seq <= SvIVX(sv) &&
seq > I_32(SvNVX(sv)) &&
strEQ(SvPVX(sv), name))
{
return (PADOFFSET)off;
}
}
/* See if it's in a nested scope */
off = pad_findlex(name, 0, seq, CvOUTSIDE(compcv), cxstack_ix);
if (off)
return off;
return 0;
}
void
pad_leavemy(fill)
I32 fill;
{
I32 off;
SV **svp = AvARRAY(comppad_name);
SV *sv;
if (min_intro_pending && fill < min_intro_pending) {
for (off = max_intro_pending; off >= min_intro_pending; off--) {
if ((sv = svp[off]) && sv != &sv_undef)
warn("%s never introduced", SvPVX(sv));
}
}
/* "Deintroduce" my variables that are leaving with this scope. */
for (off = AvFILL(comppad_name); off > fill; off--) {
if ((sv = svp[off]) && sv != &sv_undef && SvIVX(sv) == 999999999)
SvIVX(sv) = cop_seqmax;
}
}
PADOFFSET
pad_alloc(optype,tmptype)
I32 optype;
U32 tmptype;
{
SV *sv;
I32 retval;
if (AvARRAY(comppad) != curpad)
croak("panic: pad_alloc");
if (pad_reset_pending)
pad_reset();
if (tmptype & SVs_PADMY) {
do {
sv = *av_fetch(comppad, AvFILL(comppad) + 1, TRUE);
} while (SvPADBUSY(sv)); /* need a fresh one */
retval = AvFILL(comppad);
}
else {
SV **names = AvARRAY(comppad_name);
SSize_t names_fill = AvFILL(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 (++padix <= names_fill &&
(sv = names[padix]) && sv != &sv_undef)
continue;
sv = *av_fetch(comppad, padix, TRUE);
if (!(SvFLAGS(sv) & (SVs_PADTMP|SVs_PADMY)))
break;
}
retval = padix;
}
SvFLAGS(sv) |= tmptype;
curpad = AvARRAY(comppad);
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad alloc %ld for %s\n", (long) retval, op_name[optype]));
return (PADOFFSET)retval;
}
SV *
#ifndef CAN_PROTOTYPE
pad_sv(po)
PADOFFSET po;
#else
pad_sv(PADOFFSET po)
#endif /* CAN_PROTOTYPE */
{
if (!po)
croak("panic: pad_sv po");
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad sv %d\n", po));
return curpad[po]; /* eventually we'll turn this into a macro */
}
void
#ifndef CAN_PROTOTYPE
pad_free(po)
PADOFFSET po;
#else
pad_free(PADOFFSET po)
#endif /* CAN_PROTOTYPE */
{
if (!curpad)
return;
if (AvARRAY(comppad) != curpad)
croak("panic: pad_free curpad");
if (!po)
croak("panic: pad_free po");
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad free %d\n", po));
if (curpad[po] && curpad[po] != &sv_undef)
SvPADTMP_off(curpad[po]);
if ((I32)po < padix)
padix = po - 1;
}
void
#ifndef CAN_PROTOTYPE
pad_swipe(po)
PADOFFSET po;
#else
pad_swipe(PADOFFSET po)
#endif /* CAN_PROTOTYPE */
{
if (AvARRAY(comppad) != curpad)
croak("panic: pad_swipe curpad");
if (!po)
croak("panic: pad_swipe po");
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad swipe %d\n", po));
SvPADTMP_off(curpad[po]);
curpad[po] = NEWSV(1107,0);
SvPADTMP_on(curpad[po]);
if ((I32)po < padix)
padix = po - 1;
}
void
pad_reset()
{
register I32 po;
if (AvARRAY(comppad) != curpad)
croak("panic: pad_reset curpad");
DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad reset\n"));
if (!tainting) { /* Can't mix tainted and non-tainted temporaries. */
for (po = AvMAX(comppad); po > padix_floor; po--) {
if (curpad[po] && curpad[po] != &sv_undef)
SvPADTMP_off(curpad[po]);
}
padix = padix_floor;
}
pad_reset_pending = FALSE;
}
/* Destructor */
void
op_free(op)
OP *op;
{
register OP *kid, *nextkid;
if (!op || op->op_seq == (U16)-1)
return;
if (op->op_flags & OPf_KIDS) {
for (kid = cUNOP->op_first; kid; kid = nextkid) {
nextkid = kid->op_sibling; /* Get before next freeing kid */
op_free(kid);
}
}
switch (op->op_type) {
case OP_NULL:
op->op_targ = 0; /* Was holding old type, if any. */
break;
case OP_ENTEREVAL:
op->op_targ = 0; /* Was holding hints. */
break;
default:
if (!(op->op_flags & OPf_REF) || (check[op->op_type] != ck_ftst))
break;
/* FALL THROUGH */
case OP_GVSV:
case OP_GV:
case OP_AELEMFAST:
SvREFCNT_dec(cGVOP->op_gv);
break;
case OP_NEXTSTATE:
case OP_DBSTATE:
Safefree(cCOP->cop_label);
SvREFCNT_dec(cCOP->cop_filegv);
break;
case OP_CONST:
SvREFCNT_dec(cSVOP->op_sv);
break;
case OP_GOTO:
case OP_NEXT:
case OP_LAST:
case OP_REDO:
if (op->op_flags & (OPf_SPECIAL|OPf_STACKED|OPf_KIDS))
break;
/* FALL THROUGH */
case OP_TRANS:
Safefree(cPVOP->op_pv);
break;
case OP_SUBST:
op_free(cPMOP->op_pmreplroot);
/* FALL THROUGH */
case OP_PUSHRE:
case OP_MATCH:
pregfree(cPMOP->op_pmregexp);
SvREFCNT_dec(cPMOP->op_pmshort);
break;
}
if (op->op_targ > 0)
pad_free(op->op_targ);
Safefree(op);
}
static void
null(op)
OP* op;
{
if (op->op_type != OP_NULL && op->op_targ > 0)
pad_free(op->op_targ);
op->op_targ = op->op_type;
op->op_type = OP_NULL;
op->op_ppaddr = ppaddr[OP_NULL];
}
/* Contextualizers */
#define LINKLIST(o) ((o)->op_next ? (o)->op_next : linklist((OP*)o))
OP *
linklist(op)
OP *op;
{
register OP *kid;
if (op->op_next)
return op->op_next;
/* establish postfix order */
if (cUNOP->op_first) {
op->op_next = LINKLIST(cUNOP->op_first);
for (kid = cUNOP->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling)
kid->op_next = LINKLIST(kid->op_sibling);
else
kid->op_next = op;
}
}
else
op->op_next = op;
return op->op_next;
}
OP *
scalarkids(op)
OP *op;
{
OP *kid;
if (op && op->op_flags & OPf_KIDS) {
for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
scalar(kid);
}
return op;
}
static OP *
scalarboolean(op)
OP *op;
{
if (dowarn &&
op->op_type == OP_SASSIGN && cBINOP->op_first->op_type == OP_CONST) {
line_t oldline = curcop->cop_line;
if (copline != NOLINE)
curcop->cop_line = copline;
warn("Found = in conditional, should be ==");
curcop->cop_line = oldline;
}
return scalar(op);
}
OP *
scalar(op)
OP *op;
{
OP *kid;
/* assumes no premature commitment */
if (!op || (op->op_flags & OPf_KNOW) || op->op_type == OP_RETURN
|| error_count)
return op;
op->op_flags &= ~OPf_LIST;
op->op_flags |= OPf_KNOW;
switch (op->op_type) {
case OP_REPEAT:
if (op->op_private & OPpREPEAT_DOLIST)
null(((LISTOP*)cBINOP->op_first)->op_first);
scalar(cBINOP->op_first);
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
scalar(kid);
break;
case OP_SPLIT:
if ((kid = ((LISTOP*)op)->op_first) && kid->op_type == OP_PUSHRE) {
if (!kPMOP->op_pmreplroot)
deprecate("implicit split to @_");
}
/* FALL THROUGH */
case OP_MATCH:
case OP_SUBST:
case OP_NULL:
default:
if (op->op_flags & OPf_KIDS) {
for (kid = cUNOP->op_first; kid; kid = kid->op_sibling)
scalar(kid);
}
break;
case OP_LEAVE:
case OP_LEAVETRY:
scalar(cLISTOP->op_first);
/* FALL THROUGH */
case OP_SCOPE:
case OP_LINESEQ:
case OP_LIST:
for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling)
scalarvoid(kid);
else
scalar(kid);
}
curcop = &compiling;
break;
}
return op;
}
OP *
scalarvoid(op)
OP *op;
{
OP *kid;
char* useless = 0;
SV* sv;
if (!op || error_count)
return op;
if (op->op_flags & OPf_LIST)
return op;
op->op_flags |= OPf_KNOW;
switch (op->op_type) {
default:
if (!(opargs[op->op_type] & OA_FOLDCONST))
break;
/* FALL THROUGH */
case OP_REPEAT:
if (op->op_flags & OPf_STACKED)
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_SUBSTR:
case OP_VEC:
case OP_INDEX:
case OP_RINDEX:
case OP_SPRINTF:
case OP_AELEM:
case OP_AELEMFAST:
case OP_ASLICE:
case OP_VALUES:
case OP_KEYS:
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:
if (!(op->op_private & OPpLVAL_INTRO))
useless = op_desc[op->op_type];
break;
case OP_RV2GV:
case OP_RV2SV:
case OP_RV2AV:
case OP_RV2HV:
if (!(op->op_private & OPpLVAL_INTRO) &&
(!op->op_sibling || op->op_sibling->op_type != OP_READLINE))
useless = "a variable";
break;
case OP_NEXTSTATE:
case OP_DBSTATE:
curcop = ((COP*)op); /* for warning below */
break;
case OP_CONST:
sv = cSVOP->op_sv;
if (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(op); /* don't execute a constant */
SvREFCNT_dec(sv); /* don't even remember it */
break;
case OP_POSTINC:
op->op_type = OP_PREINC; /* pre-increment is faster */
op->op_ppaddr = ppaddr[OP_PREINC];
break;
case OP_POSTDEC:
op->op_type = OP_PREDEC; /* pre-decrement is faster */
op->op_ppaddr = ppaddr[OP_PREDEC];
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
scalarvoid(kid);
break;
case OP_NULL:
if (op->op_targ == OP_NEXTSTATE || op->op_targ == OP_DBSTATE)
curcop = ((COP*)op); /* for warning below */
if (op->op_flags & OPf_STACKED)
break;
case OP_ENTERTRY:
case OP_ENTER:
case OP_SCALAR:
if (!(op->op_flags & OPf_KIDS))
break;
case OP_SCOPE:
case OP_LEAVE:
case OP_LEAVETRY:
case OP_LEAVELOOP:
op->op_private |= OPpLEAVE_VOID;
case OP_LINESEQ:
case OP_LIST:
for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
scalarvoid(kid);
break;
case OP_SPLIT:
if ((kid = ((LISTOP*)op)->op_first) && kid->op_type == OP_PUSHRE) {
if (!kPMOP->op_pmreplroot)
deprecate("implicit split to @_");
}
break;
case OP_DELETE:
op->op_private |= OPpLEAVE_VOID;
break;
}
if (useless && dowarn)
warn("Useless use of %s in void context", useless);
return op;
}
OP *
listkids(op)
OP *op;
{
OP *kid;
if (op && op->op_flags & OPf_KIDS) {
for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
list(kid);
}
return op;
}
OP *
list(op)
OP *op;
{
OP *kid;
/* assumes no premature commitment */
if (!op || (op->op_flags & OPf_KNOW) || op->op_type == OP_RETURN
|| error_count)
return op;
op->op_flags |= (OPf_KNOW | OPf_LIST);
switch (op->op_type) {
case OP_FLOP:
case OP_REPEAT:
list(cBINOP->op_first);
break;
case OP_OR:
case OP_AND:
case OP_COND_EXPR:
for (kid = cUNOP->op_first->op_sibling; kid; kid = kid->op_sibling)
list(kid);
break;
default:
case OP_MATCH:
case OP_SUBST:
case OP_NULL:
if (!(op->op_flags & OPf_KIDS))
break;
if (!op->op_next && cUNOP->op_first->op_type == OP_FLOP) {
list(cBINOP->op_first);
return gen_constant_list(op);
}
case OP_LIST:
listkids(op);
break;
case OP_LEAVE:
case OP_LEAVETRY:
list(cLISTOP->op_first);
/* FALL THROUGH */
case OP_SCOPE:
case OP_LINESEQ:
for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling)
scalarvoid(kid);
else
list(kid);
}
curcop = &compiling;
break;
}
return op;
}
OP *
scalarseq(op)
OP *op;
{
OP *kid;
if (op) {
if (op->op_type == OP_LINESEQ ||
op->op_type == OP_SCOPE ||
op->op_type == OP_LEAVE ||
op->op_type == OP_LEAVETRY)
{
for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling) {
if (kid->op_sibling) {
scalarvoid(kid);
}
}
curcop = &compiling;
}
op->op_flags &= ~OPf_PARENS;
if (hints & HINT_BLOCK_SCOPE)
op->op_flags |= OPf_PARENS;
}
else
op = newOP(OP_STUB, 0);
return op;
}
static OP *
modkids(op, type)
OP *op;
I32 type;
{
OP *kid;
if (op && op->op_flags & OPf_KIDS) {
for (kid = cLISTOP->op_first; kid; kid = kid->op_sibling)
mod(kid, type);
}
return op;
}
static I32 modcount;
OP *
mod(op, type)
OP *op;
I32 type;
{
OP *kid;
SV *sv;
if (!op || error_count)
return op;
switch (op->op_type) {
case OP_CONST:
if (!(op->op_private & (OPpCONST_ARYBASE)))
goto nomod;
if (eval_start && eval_start->op_type == OP_CONST) {
compiling.cop_arybase = (I32)SvIV(((SVOP*)eval_start)->op_sv);
eval_start = 0;
}
else if (!type) {
SAVEI32(compiling.cop_arybase);
compiling.cop_arybase = 0;
}
else if (type == OP_REFGEN)
goto nomod;
else
croak("That use of $[ is unsupported");
break;
case OP_STUB:
if (op->op_flags & OPf_PARENS)
break;
goto nomod;
case OP_ENTERSUB:
if ((type == OP_UNDEF || type == OP_REFGEN) &&
!(op->op_flags & OPf_STACKED)) {
op->op_type = OP_RV2CV; /* entersub => rv2cv */
op->op_ppaddr = ppaddr[OP_RV2CV];
assert(cUNOP->op_first->op_type == OP_NULL);
null(((LISTOP*)cUNOP->op_first)->op_first); /* disable pushmark */
break;
}
/* FALL THROUGH */
default:
nomod:
/* grep, foreach, subcalls, refgen */
if (type == OP_GREPSTART || type == OP_ENTERSUB || type == OP_REFGEN)
break;
sprintf(tokenbuf, "Can't modify %s in %s",
op_desc[op->op_type],
type ? op_desc[type] : "local");
yyerror(tokenbuf);
return op;
case OP_PREINC:
case OP_PREDEC:
case OP_POW:
case OP_MULTIPLY:
case OP_DIVIDE:
case OP_MODULO:
case OP_REPEAT:
case OP_ADD:
case OP_SUBTRACT:
case OP_CONCAT:
case OP_LEFT_SHIFT:
case OP_RIGHT_SHIFT:
case OP_BIT_AND:
case OP_BIT_XOR:
case OP_BIT_OR:
case OP_I_MULTIPLY: