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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 "invlist_inline.h"
#include "reentr.h"
#include "regcharclass.h"
/* variations on pp_null */
PP(pp_stub)
{
if (GIMME_V == G_SCALAR)
rpp_xpush_IMM(&PL_sv_undef);
return NORMAL;
}
/* Pushy stuff. */
PP(pp_padcv)
{
dTARGET;
assert(SvTYPE(TARG) == SVt_PVCV);
rpp_xpush_1(TARG);
return NORMAL;
}
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_type(SVt_NULL));
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);
}
sv_setrv_noinc_mg(sv, MUTABLE_SV(gv));
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_mortalcopy_flags(sv, 0);
SvFAKE_off(newsv);
sv = newsv;
}
return sv;
}
PP(pp_rv2gv)
{
SV *sv = *PL_stack_sp;
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));
rpp_replace_1_1_NN(sv);
return NORMAL;
}
/* Helper function for pp_rv2sv and pp_rv2av/hv.
*
* Return a GV based on the value of sv, using symbolic references etc.
* On success: leaves argument on stack and returns gv.
* On failure: pops one item off stack;
* then unless (list context and not rv2sv), also pushes undef;
* then returns NULL.
*/
GV *
Perl_softref2xv(pTHX_ SV *const sv, const char *const what,
const svtype type)
{
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_LIST) {
rpp_popfree_1_NN();
return NULL;
}
rpp_replace_1_IMM_NN(&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)))
{
rpp_replace_1_IMM_NN(&PL_sv_undef);
return NULL;
}
}
else {
gv = gv_fetchsv_nomg(sv, GV_ADD, type);
}
return gv;
}
PP(pp_rv2sv)
{
SV *sv = *PL_stack_sp;
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);
if (!gv)
return NORMAL;
}
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(*PL_stack_sp));
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);
}
rpp_replace_1_1_NN(sv);
return NORMAL;
}
PP(pp_av2arylen)
{
AV * const av = MUTABLE_AV(*PL_stack_sp);
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);
}
SV *sv_al = *svp; /* the temporary SV with arylen magic */
#ifdef PERL_RC_STACK
if (SvREFCNT(av) == 1) {
/* At this point there are two SVs pointing at each other,
* av and sv_al. av -> sv_al is strong (MGf_REFCOUNTED),
* while sv_al -> av is weak, to avoid a leaking loop.
*
* The only thing keeping av alive right now is the ref from
* the stack. We want to swap av and sv_al on the stack, but
* that would trigger freeing av. So keep the ref counts and
* just swap the strong/weak pointer settings.
*
* XXX perhaps this should be done even for SvREFCNT(av)>1 ?
*/
MAGIC *mg_av = mg_find((const SV *)av, PERL_MAGIC_arylen_p);
MAGIC *mg_al = mg_find(sv_al, PERL_MAGIC_arylen);
assert(mg_av);
assert(mg_al);
assert( mg_av->mg_flags & MGf_REFCOUNTED);
assert(!(mg_al->mg_flags & MGf_REFCOUNTED));
mg_av->mg_flags &= ~MGf_REFCOUNTED;
mg_al->mg_flags |= MGf_REFCOUNTED;
*PL_stack_sp = sv_al;
}
else
#endif
rpp_replace_1_1_NN(sv_al);
} else {
SV *sv = newSViv(AvFILL(MUTABLE_AV(av)));
rpp_popfree_1();
rpp_push_1_norc(sv);
}
return NORMAL;
}
PP(pp_pos)
{
SV *sv = *PL_stack_sp;
if (PL_op->op_flags & OPf_MOD || LVRET) {
SV * const ret = newSV_type_mortal(SVt_PVLV);/* Not TARG RT#67838 */
sv_magic(ret, NULL, PERL_MAGIC_pos, NULL, 0);
LvTYPE(ret) = '.';
LvTARG(ret) = SvREFCNT_inc_simple(sv);
rpp_replace_1_1_NN(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)
rpp_replace_1_IMM_NN(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);
TARGu(i,1);
rpp_replace_1_1_NN(targ);
}
return NORMAL;
}
rpp_replace_1_IMM_NN(&PL_sv_undef);
}
return NORMAL;
}
PP(pp_rv2cv)
{
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(*PL_stack_sp, &stash_unused, &gv, flags);
if (cv) NOOP;
else if ((flags == (GV_ADD|GV_NOEXPAND)) && gv && SvROK(gv)) {
cv = SvTYPE(SvRV(gv)) == SVt_PVCV
? CV_FROM_REF((SV *)gv)
: MUTABLE_CV(gv);
}
else
cv = MUTABLE_CV(&PL_sv_undef);
rpp_replace_1_1_NN(MUTABLE_SV(cv));
return NORMAL;
}
PP(pp_prototype)
{
CV *cv;
HV *stash;
GV *gv;
SV *ret = &PL_sv_undef;
SV *fn = *PL_stack_sp;
if (SvGMAGICAL(fn))
fn = sv_mortalcopy(fn);
if (SvPOK(fn) && SvCUR(fn) >= 7) {
const char * s = SvPVX_const(fn);
if (memBEGINs(s, SvCUR(fn), "CORE::")) {
const int code = keyword(s + 6, SvCUR(fn) - 6, 1);
if (!code)
DIE(aTHX_ "Can't find an opnumber for \"%" UTF8f "\"",
UTF8fARG(SvFLAGS(fn) & SVf_UTF8, SvCUR(fn)-6, s+6));
{
SV * const sv = core_prototype(NULL, s + 6, code, NULL);
if (sv) ret = sv;
}
goto set;
}
}
cv = sv_2cv(fn, &stash, &gv, 0);
if (cv && SvPOK(cv))
ret = newSVpvn_flags(
CvPROTO(cv), CvPROTOLEN(cv), SVs_TEMP | SvUTF8(cv)
);
set:
rpp_replace_1_1_NN(ret);
return NORMAL;
}
PP(pp_anoncode)
{
CV *cv = MUTABLE_CV(PAD_SV(PL_op->op_targ));
if (CvCLONE(cv))
cv = MUTABLE_CV(sv_2mortal(MUTABLE_SV(cv_clone(cv))));
SV* sv = MUTABLE_SV(cv);
if (LIKELY(PL_op->op_flags & OPf_REF)) {
sv = refto(sv);
}
rpp_xpush_1(sv);
return NORMAL;
}
PP(pp_srefgen)
{
rpp_replace_1_1_NN(refto(*PL_stack_sp));
return NORMAL;
}
/* \( ... list ... ) */
PP(pp_refgen)
{
const U8 gimme = GIMME_V;
dMARK;
if (gimme == G_VOID)
rpp_popfree_to_NN(mark);
else if (gimme == G_SCALAR) {
if (++mark < PL_stack_sp) {
/* 2+ args on stack: free all except top one */
SV *topsv = *PL_stack_sp;
*PL_stack_sp = *mark;
*mark = topsv;
rpp_popfree_to_NN(mark);
}
else if (mark > PL_stack_sp) {
/* 0 args on stack */
rpp_xpush_IMM(&PL_sv_undef);
}
rpp_replace_1_1_NN(refto(*PL_stack_sp));
}
else {
/* G_LIST */
EXTEND_MORTAL(PL_stack_sp - MARK); /* refto() creates mortals */
while (++MARK <= PL_stack_sp) {
SV *sv = *MARK;
SV *rv = refto(sv);
#ifdef PERL_RC_STACK
SvREFCNT_dec(sv);
SvREFCNT_inc(rv);
#endif
*MARK = rv;
}
}
return NORMAL;
}
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 = newSV_type_mortal(SVt_IV);
sv_setrv_noinc(rv, sv);
return rv;
}
PP(pp_ref)
{
SV * const sv = *PL_stack_sp;
SvGETMAGIC(sv);
if (!SvROK(sv)) {
rpp_replace_1_IMM_NN(&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;
}
}
rpp_replace_1_IMM_NN(&PL_sv_yes);
return NORMAL;
}
do_sv_ref:
{
dTARGET;
sv_ref(TARG, SvRV(sv), TRUE);
rpp_replace_1_1_NN(TARG);
SvSETMAGIC(TARG);
return NORMAL;
}
}
PP(pp_bless)
{
HV *stash;
SV **sp = PL_stack_sp;
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 = *sp--;
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(*sp, stash);
if (PL_stack_sp > sp)
rpp_popfree_1();
return NORMAL;
}
PP(pp_gelem)
{
SV *sv = PL_stack_sp[0];
STRLEN len;
const char * const elem = SvPV_const(sv, len);
GV * const gv = MUTABLE_GV(PL_stack_sp[-1]);
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;
rpp_replace_2_1_NN(sv);
return NORMAL;
}
/* Pattern matching */
PP(pp_study)
{
SV *sv = *PL_stack_sp;
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. */
rpp_replace_1_IMM_NN(&PL_sv_no);
return NORMAL;
}
/* Make study a no-op. It's no longer useful and its existence
complicates matters elsewhere. */
rpp_replace_1_IMM_NN(&PL_sv_yes);
return NORMAL;
}
/* also used for: pp_transr() */
PP_wrapped(pp_trans, ((PL_op->op_flags & OPf_STACKED) ? 1 : 0), 0)
{
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) {
SSize_t i;
AV *const av = MUTABLE_AV(sv);
const SSize_t 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;
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 don't free it.
*/
assert (temp_buffer == rsptr);
goto nope_free_nothing;
}
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_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 = (char *) utf8_hop_back((U8 *) send, -1, (U8 *) start);
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)
{
dTARGET;
const bool chomping = PL_op->op_type == OP_SCHOMP;
const size_t count = do_chomp(TARG, *PL_stack_sp, chomping);
if (chomping)
sv_setiv(TARG, count);
SvSETMAGIC(TARG);
rpp_replace_1_1_NN(TARG);
return NORMAL;
}
/* also used for: pp_chomp() */
PP_wrapped(pp_chop, 0, 1)
{
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)
{
SV *sv;
if (!PL_op->op_private) {
rpp_xpush_IMM(&PL_sv_undef);
return NORMAL;
}
if (PL_op->op_private & OPpTARGET_MY) {
/* $lex = undef, or undef $lex */
SV** const padentry = &PAD_SVl(PL_op->op_targ);
sv = *padentry;
if (UNLIKELY((PL_op->op_flags & OPf_WANT) != OPf_WANT_VOID))
rpp_xpush_1(sv);
if ((PL_op->op_private & (OPpLVAL_INTRO|OPpPAD_STATE))
== OPpLVAL_INTRO)
{
save_clearsv(padentry);
}
} else {
sv = *PL_stack_sp;
if (!sv) {
/* sv is NULL when pp_undef is invoked like this:
* *myundef = \&CORE::undef; &myundef();
*/
*PL_stack_sp = &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)
: newSVhek_mortal(
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;