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pp.c
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pp.c
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/* pp.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'It's a big house this, and very peculiar. Always a bit more
* to discover, and no knowing what you'll find round a corner.
* And Elves, sir!' --Samwise Gamgee
*
* [p.225 of _The Lord of the Rings_, II/i: "Many Meetings"]
*/
/* This file contains general pp ("push/pop") functions that execute the
* opcodes that make up a perl program. A typical pp function expects to
* find its arguments on the stack, and usually pushes its results onto
* the stack, hence the 'pp' terminology. Each OP structure contains
* a pointer to the relevant pp_foo() function.
*/
#include "EXTERN.h"
#define PERL_IN_PP_C
#include "perl.h"
#include "keywords.h"
#include "reentr.h"
#include "regcharclass.h"
static const STRLEN small_mu_len = sizeof(GREEK_SMALL_LETTER_MU_UTF8) - 1;
static const STRLEN capital_iota_len = sizeof(GREEK_CAPITAL_LETTER_IOTA_UTF8) - 1;
/* variations on pp_null */
PP(pp_stub)
{
dSP;
if (GIMME_V == G_SCALAR)
XPUSHs(&PL_sv_undef);
RETURN;
}
/* Pushy stuff. */
PP(pp_padcv)
{
dSP; dTARGET;
assert(SvTYPE(TARG) == SVt_PVCV);
XPUSHs(TARG);
RETURN;
}
PP(pp_introcv)
{
dTARGET;
SvPADSTALE_off(TARG);
return NORMAL;
}
PP(pp_clonecv)
{
dTARGET;
CV * const protocv = PadnamePROTOCV(
PadlistNAMESARRAY(CvPADLIST(find_runcv(NULL)))[ARGTARG]
);
assert(SvTYPE(TARG) == SVt_PVCV);
assert(protocv);
if (CvISXSUB(protocv)) { /* constant */
/* XXX Should we clone it here? */
/* If this changes to use SAVECLEARSV, we can move the SAVECLEARSV
to introcv and remove the SvPADSTALE_off. */
SAVEPADSVANDMORTALIZE(ARGTARG);
PAD_SVl(ARGTARG) = SvREFCNT_inc_simple_NN(protocv);
}
else {
if (CvROOT(protocv)) {
assert(CvCLONE(protocv));
assert(!CvCLONED(protocv));
}
cv_clone_into(protocv,(CV *)TARG);
SAVECLEARSV(PAD_SVl(ARGTARG));
}
return NORMAL;
}
/* Translations. */
/* In some cases this function inspects PL_op. If this function is called
for new op types, more bool parameters may need to be added in place of
the checks.
When noinit is true, the absence of a gv will cause a retval of undef.
This is unrelated to the cv-to-gv assignment case.
*/
static SV *
S_rv2gv(pTHX_ SV *sv, const bool vivify_sv, const bool strict,
const bool noinit)
{
if (!isGV(sv) || SvFAKE(sv)) SvGETMAGIC(sv);
if (SvROK(sv)) {
if (SvAMAGIC(sv)) {
sv = amagic_deref_call(sv, to_gv_amg);
}
wasref:
sv = SvRV(sv);
if (SvTYPE(sv) == SVt_PVIO) {
GV * const gv = MUTABLE_GV(sv_newmortal());
gv_init(gv, 0, "__ANONIO__", 10, 0);
GvIOp(gv) = MUTABLE_IO(sv);
SvREFCNT_inc_void_NN(sv);
sv = MUTABLE_SV(gv);
}
else if (!isGV_with_GP(sv)) {
Perl_die(aTHX_ "Not a GLOB reference");
}
}
else {
if (!isGV_with_GP(sv)) {
if (!SvOK(sv)) {
/* If this is a 'my' scalar and flag is set then vivify
* NI-S 1999/05/07
*/
if (vivify_sv && sv != &PL_sv_undef) {
GV *gv;
HV *stash;
if (SvREADONLY(sv))
Perl_croak_no_modify();
gv = MUTABLE_GV(newSV(0));
stash = CopSTASH(PL_curcop);
if (SvTYPE(stash) != SVt_PVHV) stash = NULL;
if (cUNOP->op_targ) {
SV * const namesv = PAD_SV(cUNOP->op_targ);
gv_init_sv(gv, stash, namesv, 0);
}
else {
gv_init_pv(gv, stash, "__ANONIO__", 0);
}
prepare_SV_for_RV(sv);
SvRV_set(sv, MUTABLE_SV(gv));
SvROK_on(sv);
SvSETMAGIC(sv);
goto wasref;
}
if (PL_op->op_flags & OPf_REF || strict) {
Perl_die(aTHX_ PL_no_usym, "a symbol");
}
if (ckWARN(WARN_UNINITIALIZED))
report_uninit(sv);
return &PL_sv_undef;
}
if (noinit)
{
if (!(sv = MUTABLE_SV(gv_fetchsv_nomg(
sv, GV_ADDMG, SVt_PVGV
))))
return &PL_sv_undef;
}
else {
if (strict) {
Perl_die(aTHX_
PL_no_symref_sv,
sv,
(SvPOKp(sv) && SvCUR(sv)>32 ? "..." : ""),
"a symbol"
);
}
if ((PL_op->op_private & (OPpLVAL_INTRO|OPpDONT_INIT_GV))
== OPpDONT_INIT_GV) {
/* We are the target of a coderef assignment. Return
the scalar unchanged, and let pp_sasssign deal with
things. */
return sv;
}
sv = MUTABLE_SV(gv_fetchsv_nomg(sv, GV_ADD, SVt_PVGV));
}
/* FAKE globs in the symbol table cause weird bugs (#77810) */
SvFAKE_off(sv);
}
}
if (SvFAKE(sv) && !(PL_op->op_private & OPpALLOW_FAKE)) {
SV *newsv = sv_newmortal();
sv_setsv_flags(newsv, sv, 0);
SvFAKE_off(newsv);
sv = newsv;
}
return sv;
}
PP(pp_rv2gv)
{
dSP; dTOPss;
sv = S_rv2gv(aTHX_
sv, PL_op->op_private & OPpDEREF,
PL_op->op_private & HINT_STRICT_REFS,
((PL_op->op_flags & OPf_SPECIAL) && !(PL_op->op_flags & OPf_MOD))
|| PL_op->op_type == OP_READLINE
);
if (PL_op->op_private & OPpLVAL_INTRO)
save_gp(MUTABLE_GV(sv), !(PL_op->op_flags & OPf_SPECIAL));
SETs(sv);
RETURN;
}
/* Helper function for pp_rv2sv and pp_rv2av */
GV *
Perl_softref2xv(pTHX_ SV *const sv, const char *const what,
const svtype type, SV ***spp)
{
GV *gv;
PERL_ARGS_ASSERT_SOFTREF2XV;
if (PL_op->op_private & HINT_STRICT_REFS) {
if (SvOK(sv))
Perl_die(aTHX_ PL_no_symref_sv, sv,
(SvPOKp(sv) && SvCUR(sv)>32 ? "..." : ""), what);
else
Perl_die(aTHX_ PL_no_usym, what);
}
if (!SvOK(sv)) {
if (
PL_op->op_flags & OPf_REF
)
Perl_die(aTHX_ PL_no_usym, what);
if (ckWARN(WARN_UNINITIALIZED))
report_uninit(sv);
if (type != SVt_PV && GIMME_V == G_ARRAY) {
(*spp)--;
return NULL;
}
**spp = &PL_sv_undef;
return NULL;
}
if ((PL_op->op_flags & OPf_SPECIAL) &&
!(PL_op->op_flags & OPf_MOD))
{
if (!(gv = gv_fetchsv_nomg(sv, GV_ADDMG, type)))
{
**spp = &PL_sv_undef;
return NULL;
}
}
else {
gv = gv_fetchsv_nomg(sv, GV_ADD, type);
}
return gv;
}
PP(pp_rv2sv)
{
dSP; dTOPss;
GV *gv = NULL;
SvGETMAGIC(sv);
if (SvROK(sv)) {
if (SvAMAGIC(sv)) {
sv = amagic_deref_call(sv, to_sv_amg);
}
sv = SvRV(sv);
if (SvTYPE(sv) >= SVt_PVAV)
DIE(aTHX_ "Not a SCALAR reference");
}
else {
gv = MUTABLE_GV(sv);
if (!isGV_with_GP(gv)) {
gv = Perl_softref2xv(aTHX_ sv, "a SCALAR", SVt_PV, &sp);
if (!gv)
RETURN;
}
sv = GvSVn(gv);
}
if (PL_op->op_flags & OPf_MOD) {
if (PL_op->op_private & OPpLVAL_INTRO) {
if (cUNOP->op_first->op_type == OP_NULL)
sv = save_scalar(MUTABLE_GV(TOPs));
else if (gv)
sv = save_scalar(gv);
else
Perl_croak(aTHX_ "%s", PL_no_localize_ref);
}
else if (PL_op->op_private & OPpDEREF)
sv = vivify_ref(sv, PL_op->op_private & OPpDEREF);
}
SPAGAIN; /* in case chasing soft refs reallocated the stack */
SETs(sv);
RETURN;
}
PP(pp_av2arylen)
{
dSP;
AV * const av = MUTABLE_AV(TOPs);
const I32 lvalue = PL_op->op_flags & OPf_MOD || LVRET;
if (lvalue) {
SV ** const svp = Perl_av_arylen_p(aTHX_ MUTABLE_AV(av));
if (!*svp) {
*svp = newSV_type(SVt_PVMG);
sv_magic(*svp, MUTABLE_SV(av), PERL_MAGIC_arylen, NULL, 0);
}
SETs(*svp);
} else {
SETs(sv_2mortal(newSViv(AvFILL(MUTABLE_AV(av)))));
}
RETURN;
}
PP(pp_pos)
{
dSP; dTOPss;
if (PL_op->op_flags & OPf_MOD || LVRET) {
SV * const ret = sv_2mortal(newSV_type(SVt_PVLV));/* Not TARG RT#67838 */
sv_magic(ret, NULL, PERL_MAGIC_pos, NULL, 0);
LvTYPE(ret) = '.';
LvTARG(ret) = SvREFCNT_inc_simple(sv);
SETs(ret); /* no SvSETMAGIC */
}
else {
const MAGIC * const mg = mg_find_mglob(sv);
if (mg && mg->mg_len != -1) {
STRLEN i = mg->mg_len;
if (PL_op->op_private & OPpTRUEBOOL)
SETs(i ? &PL_sv_yes : &PL_sv_zero);
else {
dTARGET;
if (mg->mg_flags & MGf_BYTES && DO_UTF8(sv))
i = sv_pos_b2u_flags(sv, i, SV_GMAGIC|SV_CONST_RETURN);
SETu(i);
}
return NORMAL;
}
SETs(&PL_sv_undef);
}
return NORMAL;
}
PP(pp_rv2cv)
{
dSP;
GV *gv;
HV *stash_unused;
const I32 flags = (PL_op->op_flags & OPf_SPECIAL)
? GV_ADDMG
: ((PL_op->op_private & (OPpLVAL_INTRO|OPpMAY_RETURN_CONSTANT))
== OPpMAY_RETURN_CONSTANT)
? GV_ADD|GV_NOEXPAND
: GV_ADD;
/* We usually try to add a non-existent subroutine in case of AUTOLOAD. */
/* (But not in defined().) */
CV *cv = sv_2cv(TOPs, &stash_unused, &gv, flags);
if (cv) NOOP;
else if ((flags == (GV_ADD|GV_NOEXPAND)) && gv && SvROK(gv)) {
cv = SvTYPE(SvRV(gv)) == SVt_PVCV
? MUTABLE_CV(SvRV(gv))
: MUTABLE_CV(gv);
}
else
cv = MUTABLE_CV(&PL_sv_undef);
SETs(MUTABLE_SV(cv));
return NORMAL;
}
PP(pp_prototype)
{
dSP;
CV *cv;
HV *stash;
GV *gv;
SV *ret = &PL_sv_undef;
if (SvGMAGICAL(TOPs)) SETs(sv_mortalcopy(TOPs));
if (SvPOK(TOPs) && SvCUR(TOPs) >= 7) {
const char * s = SvPVX_const(TOPs);
if (memBEGINs(s, SvCUR(TOPs), "CORE::")) {
const int code = keyword(s + 6, SvCUR(TOPs) - 6, 1);
if (!code)
DIE(aTHX_ "Can't find an opnumber for \"%" UTF8f "\"",
UTF8fARG(SvFLAGS(TOPs) & SVf_UTF8, SvCUR(TOPs)-6, s+6));
{
SV * const sv = core_prototype(NULL, s + 6, code, NULL);
if (sv) ret = sv;
}
goto set;
}
}
cv = sv_2cv(TOPs, &stash, &gv, 0);
if (cv && SvPOK(cv))
ret = newSVpvn_flags(
CvPROTO(cv), CvPROTOLEN(cv), SVs_TEMP | SvUTF8(cv)
);
set:
SETs(ret);
RETURN;
}
PP(pp_anoncode)
{
dSP;
CV *cv = MUTABLE_CV(PAD_SV(PL_op->op_targ));
if (CvCLONE(cv))
cv = MUTABLE_CV(sv_2mortal(MUTABLE_SV(cv_clone(cv))));
EXTEND(SP,1);
PUSHs(MUTABLE_SV(cv));
RETURN;
}
PP(pp_srefgen)
{
dSP;
*SP = refto(*SP);
return NORMAL;
}
PP(pp_refgen)
{
dSP; dMARK;
if (GIMME_V != G_ARRAY) {
if (++MARK <= SP)
*MARK = *SP;
else
{
MEXTEND(SP, 1);
*MARK = &PL_sv_undef;
}
*MARK = refto(*MARK);
SP = MARK;
RETURN;
}
EXTEND_MORTAL(SP - MARK);
while (++MARK <= SP)
*MARK = refto(*MARK);
RETURN;
}
STATIC SV*
S_refto(pTHX_ SV *sv)
{
SV* rv;
PERL_ARGS_ASSERT_REFTO;
if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
if (LvTARGLEN(sv))
vivify_defelem(sv);
if (!(sv = LvTARG(sv)))
sv = &PL_sv_undef;
else
SvREFCNT_inc_void_NN(sv);
}
else if (SvTYPE(sv) == SVt_PVAV) {
if (!AvREAL((const AV *)sv) && AvREIFY((const AV *)sv))
av_reify(MUTABLE_AV(sv));
SvTEMP_off(sv);
SvREFCNT_inc_void_NN(sv);
}
else if (SvPADTMP(sv)) {
sv = newSVsv(sv);
}
else if (UNLIKELY(SvSMAGICAL(sv) && mg_find(sv, PERL_MAGIC_nonelem)))
sv_unmagic(SvREFCNT_inc_simple_NN(sv), PERL_MAGIC_nonelem);
else {
SvTEMP_off(sv);
SvREFCNT_inc_void_NN(sv);
}
rv = sv_newmortal();
sv_upgrade(rv, SVt_IV);
SvRV_set(rv, sv);
SvROK_on(rv);
return rv;
}
PP(pp_ref)
{
dSP;
SV * const sv = TOPs;
SvGETMAGIC(sv);
if (!SvROK(sv)) {
SETs(&PL_sv_no);
return NORMAL;
}
/* op is in boolean context? */
if ( (PL_op->op_private & OPpTRUEBOOL)
|| ( (PL_op->op_private & OPpMAYBE_TRUEBOOL)
&& block_gimme() == G_VOID))
{
/* refs are always true - unless it's to an object blessed into a
* class with a false name, i.e. "0". So we have to check for
* that remote possibility. The following is is basically an
* unrolled SvTRUE(sv_reftype(rv)) */
SV * const rv = SvRV(sv);
if (SvOBJECT(rv)) {
HV *stash = SvSTASH(rv);
HEK *hek = HvNAME_HEK(stash);
if (hek) {
I32 len = HEK_LEN(hek);
/* bail out and do it the hard way? */
if (UNLIKELY(
len == HEf_SVKEY
|| (len == 1 && HEK_KEY(hek)[0] == '0')
))
goto do_sv_ref;
}
}
SETs(&PL_sv_yes);
return NORMAL;
}
do_sv_ref:
{
dTARGET;
SETs(TARG);
sv_ref(TARG, SvRV(sv), TRUE);
SvSETMAGIC(TARG);
return NORMAL;
}
}
PP(pp_bless)
{
dSP;
HV *stash;
if (MAXARG == 1)
{
curstash:
stash = CopSTASH(PL_curcop);
if (SvTYPE(stash) != SVt_PVHV)
Perl_croak(aTHX_ "Attempt to bless into a freed package");
}
else {
SV * const ssv = POPs;
STRLEN len;
const char *ptr;
if (!ssv) goto curstash;
SvGETMAGIC(ssv);
if (SvROK(ssv)) {
if (!SvAMAGIC(ssv)) {
frog:
Perl_croak(aTHX_ "Attempt to bless into a reference");
}
/* SvAMAGIC is on here, but it only means potentially overloaded,
so after stringification: */
ptr = SvPV_nomg_const(ssv,len);
/* We need to check the flag again: */
if (!SvAMAGIC(ssv)) goto frog;
}
else ptr = SvPV_nomg_const(ssv,len);
if (len == 0)
Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
"Explicit blessing to '' (assuming package main)");
stash = gv_stashpvn(ptr, len, GV_ADD|SvUTF8(ssv));
}
(void)sv_bless(TOPs, stash);
RETURN;
}
PP(pp_gelem)
{
dSP;
SV *sv = POPs;
STRLEN len;
const char * const elem = SvPV_const(sv, len);
GV * const gv = MUTABLE_GV(TOPs);
SV * tmpRef = NULL;
sv = NULL;
if (elem) {
/* elem will always be NUL terminated. */
switch (*elem) {
case 'A':
if (memEQs(elem, len, "ARRAY"))
{
tmpRef = MUTABLE_SV(GvAV(gv));
if (tmpRef && !AvREAL((const AV *)tmpRef)
&& AvREIFY((const AV *)tmpRef))
av_reify(MUTABLE_AV(tmpRef));
}
break;
case 'C':
if (memEQs(elem, len, "CODE"))
tmpRef = MUTABLE_SV(GvCVu(gv));
break;
case 'F':
if (memEQs(elem, len, "FILEHANDLE")) {
tmpRef = MUTABLE_SV(GvIOp(gv));
}
else
if (memEQs(elem, len, "FORMAT"))
tmpRef = MUTABLE_SV(GvFORM(gv));
break;
case 'G':
if (memEQs(elem, len, "GLOB"))
tmpRef = MUTABLE_SV(gv);
break;
case 'H':
if (memEQs(elem, len, "HASH"))
tmpRef = MUTABLE_SV(GvHV(gv));
break;
case 'I':
if (memEQs(elem, len, "IO"))
tmpRef = MUTABLE_SV(GvIOp(gv));
break;
case 'N':
if (memEQs(elem, len, "NAME"))
sv = newSVhek(GvNAME_HEK(gv));
break;
case 'P':
if (memEQs(elem, len, "PACKAGE")) {
const HV * const stash = GvSTASH(gv);
const HEK * const hek = stash ? HvNAME_HEK(stash) : NULL;
sv = hek ? newSVhek(hek) : newSVpvs("__ANON__");
}
break;
case 'S':
if (memEQs(elem, len, "SCALAR"))
tmpRef = GvSVn(gv);
break;
}
}
if (tmpRef)
sv = newRV(tmpRef);
if (sv)
sv_2mortal(sv);
else
sv = &PL_sv_undef;
SETs(sv);
RETURN;
}
/* Pattern matching */
PP(pp_study)
{
dSP; dTOPss;
STRLEN len;
(void)SvPV(sv, len);
if (len == 0 || len > I32_MAX || !SvPOK(sv) || SvUTF8(sv) || SvVALID(sv)) {
/* Historically, study was skipped in these cases. */
SETs(&PL_sv_no);
return NORMAL;
}
/* Make study a no-op. It's no longer useful and its existence
complicates matters elsewhere. */
SETs(&PL_sv_yes);
return NORMAL;
}
/* also used for: pp_transr() */
PP(pp_trans)
{
dSP;
SV *sv;
if (PL_op->op_flags & OPf_STACKED)
sv = POPs;
else {
EXTEND(SP,1);
if (ARGTARG)
sv = PAD_SV(ARGTARG);
else {
sv = DEFSV;
}
}
if(PL_op->op_type == OP_TRANSR) {
STRLEN len;
const char * const pv = SvPV(sv,len);
SV * const newsv = newSVpvn_flags(pv, len, SVs_TEMP|SvUTF8(sv));
do_trans(newsv);
PUSHs(newsv);
}
else {
Size_t i = do_trans(sv);
mPUSHi((UV)i);
}
RETURN;
}
/* Lvalue operators. */
static size_t
S_do_chomp(pTHX_ SV *retval, SV *sv, bool chomping)
{
STRLEN len;
char *s;
size_t count = 0;
PERL_ARGS_ASSERT_DO_CHOMP;
if (chomping && (RsSNARF(PL_rs) || RsRECORD(PL_rs)))
return 0;
if (SvTYPE(sv) == SVt_PVAV) {
I32 i;
AV *const av = MUTABLE_AV(sv);
const I32 max = AvFILL(av);
for (i = 0; i <= max; i++) {
sv = MUTABLE_SV(av_fetch(av, i, FALSE));
if (sv && ((sv = *(SV**)sv), sv != &PL_sv_undef))
count += do_chomp(retval, sv, chomping);
}
return count;
}
else if (SvTYPE(sv) == SVt_PVHV) {
HV* const hv = MUTABLE_HV(sv);
HE* entry;
(void)hv_iterinit(hv);
while ((entry = hv_iternext(hv)))
count += do_chomp(retval, hv_iterval(hv,entry), chomping);
return count;
}
else if (SvREADONLY(sv)) {
Perl_croak_no_modify();
}
s = SvPV(sv, len);
if (chomping) {
if (s && len) {
char *temp_buffer = NULL;
SV *svrecode = NULL;
s += --len;
if (RsPARA(PL_rs)) {
if (*s != '\n')
goto nope_free_nothing;
++count;
while (len && s[-1] == '\n') {
--len;
--s;
++count;
}
}
else {
STRLEN rslen, rs_charlen;
const char *rsptr = SvPV_const(PL_rs, rslen);
rs_charlen = SvUTF8(PL_rs)
? sv_len_utf8(PL_rs)
: rslen;
if (SvUTF8(PL_rs) != SvUTF8(sv)) {
/* Assumption is that rs is shorter than the scalar. */
if (SvUTF8(PL_rs)) {
/* RS is utf8, scalar is 8 bit. */
bool is_utf8 = TRUE;
temp_buffer = (char*)bytes_from_utf8((U8*)rsptr,
&rslen, &is_utf8);
if (is_utf8) {
/* Cannot downgrade, therefore cannot possibly match.
At this point, temp_buffer is not alloced, and
is the buffer inside PL_rs, so dont free it.
*/
assert (temp_buffer == rsptr);
goto nope_free_sv;
}
rsptr = temp_buffer;
}
else {
/* RS is 8 bit, scalar is utf8. */
temp_buffer = (char*)bytes_to_utf8((U8*)rsptr, &rslen);
rsptr = temp_buffer;
}
}
if (rslen == 1) {
if (*s != *rsptr)
goto nope_free_all;
++count;
}
else {
if (len < rslen - 1)
goto nope_free_all;
len -= rslen - 1;
s -= rslen - 1;
if (memNE(s, rsptr, rslen))
goto nope_free_all;
count += rs_charlen;
}
}
SvPV_force_nomg_nolen(sv);
SvCUR_set(sv, len);
*SvEND(sv) = '\0';
SvNIOK_off(sv);
SvSETMAGIC(sv);
nope_free_all:
Safefree(temp_buffer);
nope_free_sv:
SvREFCNT_dec(svrecode);
nope_free_nothing: ;
}
} else {
if (len && (!SvPOK(sv) || SvIsCOW(sv)))
s = SvPV_force_nomg(sv, len);
if (DO_UTF8(sv)) {
if (s && len) {
char * const send = s + len;
char * const start = s;
s = send - 1;
while (s > start && UTF8_IS_CONTINUATION(*s))
s--;
if (is_utf8_string((U8*)s, send - s)) {
sv_setpvn(retval, s, send - s);
*s = '\0';
SvCUR_set(sv, s - start);
SvNIOK_off(sv);
SvUTF8_on(retval);
}
}
else
SvPVCLEAR(retval);
}
else if (s && len) {
s += --len;
sv_setpvn(retval, s, 1);
*s = '\0';
SvCUR_set(sv, len);
SvUTF8_off(sv);
SvNIOK_off(sv);
}
else
SvPVCLEAR(retval);
SvSETMAGIC(sv);
}
return count;
}
/* also used for: pp_schomp() */
PP(pp_schop)
{
dSP; dTARGET;
const bool chomping = PL_op->op_type == OP_SCHOMP;
const size_t count = do_chomp(TARG, TOPs, chomping);
if (chomping)
sv_setiv(TARG, count);
SETTARG;
return NORMAL;
}
/* also used for: pp_chomp() */
PP(pp_chop)
{
dSP; dMARK; dTARGET; dORIGMARK;
const bool chomping = PL_op->op_type == OP_CHOMP;
size_t count = 0;
while (MARK < SP)
count += do_chomp(TARG, *++MARK, chomping);
if (chomping)
sv_setiv(TARG, count);
SP = ORIGMARK;
XPUSHTARG;
RETURN;
}
PP(pp_undef)
{
dSP;
SV *sv;
if (!PL_op->op_private) {
EXTEND(SP, 1);
RETPUSHUNDEF;
}
sv = TOPs;
if (!sv)
{
SETs(&PL_sv_undef);
return NORMAL;
}
if (SvTHINKFIRST(sv))
sv_force_normal_flags(sv, SV_COW_DROP_PV|SV_IMMEDIATE_UNREF);
switch (SvTYPE(sv)) {
case SVt_NULL:
break;
case SVt_PVAV:
av_undef(MUTABLE_AV(sv));
break;
case SVt_PVHV:
hv_undef(MUTABLE_HV(sv));
break;
case SVt_PVCV:
if (cv_const_sv((const CV *)sv))
Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
"Constant subroutine %" SVf " undefined",
SVfARG(CvANON((const CV *)sv)
? newSVpvs_flags("(anonymous)", SVs_TEMP)
: sv_2mortal(newSVhek(
CvNAMED(sv)
? CvNAME_HEK((CV *)sv)
: GvENAME_HEK(CvGV((const CV *)sv))
))
));
/* FALLTHROUGH */
case SVt_PVFM:
/* let user-undef'd sub keep its identity */
cv_undef_flags(MUTABLE_CV(sv), CV_UNDEF_KEEP_NAME);
break;
case SVt_PVGV:
assert(isGV_with_GP(sv));
assert(!SvFAKE(sv));
{
GP *gp;
HV *stash;
/* undef *Pkg::meth_name ... */
bool method_changed
= GvCVu((const GV *)sv) && (stash = GvSTASH((const GV *)sv))
&& HvENAME_get(stash);
/* undef *Foo:: */
if((stash = GvHV((const GV *)sv))) {
if(HvENAME_get(stash))
SvREFCNT_inc_simple_void_NN(sv_2mortal((SV *)stash));
else stash = NULL;
}
SvREFCNT_inc_simple_void_NN(sv_2mortal(sv));
gp_free(MUTABLE_GV(sv));
Newxz(gp, 1, GP);
GvGP_set(sv, gp_ref(gp));
#ifndef PERL_DONT_CREATE_GVSV
GvSV(sv) = newSV(0);
#endif
GvLINE(sv) = CopLINE(PL_curcop);
GvEGV(sv) = MUTABLE_GV(sv);
GvMULTI_on(sv);
if(stash)
mro_package_moved(NULL, stash, (const GV *)sv, 0);
stash = NULL;
/* undef *Foo::ISA */
if( strEQ(GvNAME((const GV *)sv), "ISA")
&& (stash = GvSTASH((const GV *)sv))
&& (method_changed || HvENAME(stash)) )
mro_isa_changed_in(stash);
else if(method_changed)
mro_method_changed_in(
GvSTASH((const GV *)sv)
);
break;
}
default:
if (SvTYPE(sv) >= SVt_PV && SvPVX_const(sv) && SvLEN(sv)) {
SvPV_free(sv);
SvPV_set(sv, NULL);
SvLEN_set(sv, 0);
}
SvOK_off(sv);
SvSETMAGIC(sv);
}
SETs(&PL_sv_undef);
return NORMAL;
}
/* common "slow" code for pp_postinc and pp_postdec */
static OP *
S_postincdec_common(pTHX_ SV *sv, SV *targ)
{
dSP;
const bool inc =
PL_op->op_type == OP_POSTINC || PL_op->op_type == OP_I_POSTINC;
if (SvROK(sv))
TARG = sv_newmortal();
sv_setsv(TARG, sv);
if (inc)
sv_inc_nomg(sv);
else
sv_dec_nomg(sv);