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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"
/* XXX I can't imagine anyone who doesn't have this actually _needs_
it, since pid_t is an integral type.
--AD 2/20/1998
*/
#ifdef NEED_GETPID_PROTO
extern Pid_t getpid (void);
#endif
/*
* Some BSDs and Cygwin default to POSIX math instead of IEEE.
* This switches them over to IEEE.
*/
#if defined(LIBM_LIB_VERSION)
_LIB_VERSION_TYPE _LIB_VERSION = _IEEE_;
#endif
/* variations on pp_null */
PP(pp_stub)
{
dVAR;
dSP;
if (GIMME_V == G_SCALAR)
XPUSHs(&PL_sv_undef);
RETURN;
}
/* Pushy stuff. */
PP(pp_padav)
{
dVAR; dSP; dTARGET;
I32 gimme;
assert(SvTYPE(TARG) == SVt_PVAV);
if (PL_op->op_private & OPpLVAL_INTRO)
if (!(PL_op->op_private & OPpPAD_STATE))
SAVECLEARSV(PAD_SVl(PL_op->op_targ));
EXTEND(SP, 1);
if (PL_op->op_flags & OPf_REF) {
PUSHs(TARG);
RETURN;
} else if (PL_op->op_private & OPpMAYBE_LVSUB) {
const I32 flags = is_lvalue_sub();
if (flags && !(flags & OPpENTERSUB_INARGS)) {
if (GIMME == G_SCALAR)
Perl_croak(aTHX_ "Can't return array to lvalue scalar context");
PUSHs(TARG);
RETURN;
}
}
gimme = GIMME_V;
if (gimme == G_ARRAY) {
const I32 maxarg = AvFILL(MUTABLE_AV(TARG)) + 1;
EXTEND(SP, maxarg);
if (SvMAGICAL(TARG)) {
U32 i;
for (i=0; i < (U32)maxarg; i++) {
SV * const * const svp = av_fetch(MUTABLE_AV(TARG), i, FALSE);
SP[i+1] = (svp) ? *svp : &PL_sv_undef;
}
}
else {
Copy(AvARRAY((const AV *)TARG), SP+1, maxarg, SV*);
}
SP += maxarg;
}
else if (gimme == G_SCALAR) {
SV* const sv = sv_newmortal();
const I32 maxarg = AvFILL(MUTABLE_AV(TARG)) + 1;
sv_setiv(sv, maxarg);
PUSHs(sv);
}
RETURN;
}
PP(pp_padhv)
{
dVAR; dSP; dTARGET;
I32 gimme;
assert(SvTYPE(TARG) == SVt_PVHV);
XPUSHs(TARG);
if (PL_op->op_private & OPpLVAL_INTRO)
if (!(PL_op->op_private & OPpPAD_STATE))
SAVECLEARSV(PAD_SVl(PL_op->op_targ));
if (PL_op->op_flags & OPf_REF)
RETURN;
else if (PL_op->op_private & OPpMAYBE_LVSUB) {
const I32 flags = is_lvalue_sub();
if (flags && !(flags & OPpENTERSUB_INARGS)) {
if (GIMME == G_SCALAR)
Perl_croak(aTHX_ "Can't return hash to lvalue scalar context");
RETURN;
}
}
gimme = GIMME_V;
if (gimme == G_ARRAY) {
RETURNOP(Perl_do_kv(aTHX));
}
else if (gimme == G_SCALAR) {
SV* const sv = Perl_hv_scalar(aTHX_ MUTABLE_HV(TARG));
SETs(sv);
}
RETURN;
}
/* Translations. */
static const char S_no_symref_sv[] =
"Can't use string (\"%" SVf32 "\"%s) as %s ref while \"strict refs\" in use";
/* 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)
{
dVAR;
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__", 11, 0);
GvIOp(gv) = MUTABLE_IO(sv);
SvREFCNT_inc_void_NN(sv);
sv = MUTABLE_SV(gv);
}
else if (!isGV_with_GP(sv))
return (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;
if (SvREADONLY(sv))
Perl_croak_no_modify(aTHX);
if (cUNOP->op_targ) {
SV * const namesv = PAD_SV(cUNOP->op_targ);
gv = MUTABLE_GV(newSV(0));
gv_init_sv(gv, CopSTASH(PL_curcop), namesv, 0);
}
else {
const char * const name = CopSTASHPV(PL_curcop);
gv = newGVgen_flags(name,
HvNAMEUTF8(CopSTASH(PL_curcop)) ? SVf_UTF8 : 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)
return (SV *)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)
return
(SV *)Perl_die(aTHX_
S_no_symref_sv,
sv,
(SvPOK(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)) {
SV *newsv = sv_newmortal();
sv_setsv_flags(newsv, sv, 0);
SvFAKE_off(newsv);
sv = newsv;
}
return sv;
}
PP(pp_rv2gv)
{
dVAR; 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)
{
dVAR;
GV *gv;
PERL_ARGS_ASSERT_SOFTREF2XV;
if (PL_op->op_private & HINT_STRICT_REFS) {
if (SvOK(sv))
Perl_die(aTHX_ S_no_symref_sv, sv, (SvPOK(sv) && SvCUR(sv)>32 ? "..." : ""), what);
else
Perl_die(aTHX_ PL_no_usym, what);
}
if (!SvOK(sv)) {
if (
PL_op->op_flags & OPf_REF &&
PL_op->op_next->op_type != OP_BOOLKEYS
)
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)
{
dVAR; dSP; dTOPss;
GV *gv = NULL;
SvGETMAGIC(sv);
if (SvROK(sv)) {
if (SvAMAGIC(sv)) {
sv = amagic_deref_call(sv, to_sv_amg);
}
sv = SvRV(sv);
switch (SvTYPE(sv)) {
case SVt_PVAV:
case SVt_PVHV:
case SVt_PVCV:
case SVt_PVFM:
case SVt_PVIO:
DIE(aTHX_ "Not a SCALAR reference");
default: NOOP;
}
}
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);
}
SETs(sv);
RETURN;
}
PP(pp_av2arylen)
{
dVAR; dSP;
AV * const av = MUTABLE_AV(TOPs);
const I32 lvalue = PL_op->op_flags & OPf_MOD || LVRET;
if (lvalue) {
SV ** const sv = Perl_av_arylen_p(aTHX_ MUTABLE_AV(av));
if (!*sv) {
*sv = newSV_type(SVt_PVMG);
sv_magic(*sv, MUTABLE_SV(av), PERL_MAGIC_arylen, NULL, 0);
}
SETs(*sv);
} else {
SETs(sv_2mortal(newSViv(AvFILL(MUTABLE_AV(av)))));
}
RETURN;
}
PP(pp_pos)
{
dVAR; dSP; dPOPss;
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);
PUSHs(ret); /* no SvSETMAGIC */
RETURN;
}
else {
if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
const MAGIC * const mg = mg_find(sv, PERL_MAGIC_regex_global);
if (mg && mg->mg_len >= 0) {
dTARGET;
I32 i = mg->mg_len;
if (DO_UTF8(sv))
sv_pos_b2u(sv, &i);
PUSHi(i);
RETURN;
}
}
RETPUSHUNDEF;
}
}
PP(pp_rv2cv)
{
dVAR; 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) {
if (CvCLONE(cv))
cv = MUTABLE_CV(sv_2mortal(MUTABLE_SV(cv_clone(cv))));
if ((PL_op->op_private & OPpLVAL_INTRO)) {
if (gv && GvCV(gv) == cv && (gv = gv_autoload_pvn(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv), GvNAMEUTF8(gv) ? SVf_UTF8 : 0)))
cv = GvCV(gv);
if (!CvLVALUE(cv))
DIE(aTHX_ "Can't modify non-lvalue subroutine call");
}
}
else if ((flags == (GV_ADD|GV_NOEXPAND)) && gv && SvROK(gv)) {
cv = MUTABLE_CV(gv);
}
else
cv = MUTABLE_CV(&PL_sv_undef);
SETs(MUTABLE_SV(cv));
RETURN;
}
PP(pp_prototype)
{
dVAR; dSP;
CV *cv;
HV *stash;
GV *gv;
SV *ret = &PL_sv_undef;
if (SvPOK(TOPs) && SvCUR(TOPs) >= 7) {
const char * s = SvPVX_const(TOPs);
if (strnEQ(s, "CORE::", 6)) {
const int code = keyword(s + 6, SvCUR(TOPs) - 6, 1);
if (!code || code == -KEY_CORE)
DIE(aTHX_ "Can't find an opnumber for \"%s\"", s+6);
if (code < 0) { /* Overridable. */
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)
{
dVAR; 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)
{
dVAR; dSP;
*SP = refto(*SP);
RETURN;
}
PP(pp_refgen)
{
dVAR; dSP; dMARK;
if (GIMME != G_ARRAY) {
if (++MARK <= SP)
*MARK = *SP;
else
*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)
{
dVAR;
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) && !IS_PADGV(sv))
sv = newSVsv(sv);
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)
{
dVAR; dSP; dTARGET;
SV * const sv = POPs;
if (sv)
SvGETMAGIC(sv);
if (!sv || !SvROK(sv))
RETPUSHNO;
(void)sv_ref(TARG,SvRV(sv),TRUE);
PUSHTARG;
RETURN;
}
PP(pp_bless)
{
dVAR; dSP;
HV *stash;
if (MAXARG == 1)
curstash:
stash = CopSTASH(PL_curcop);
else {
SV * const ssv = POPs;
STRLEN len;
const char *ptr;
if (!ssv) goto curstash;
if (!SvGMAGICAL(ssv) && !SvAMAGIC(ssv) && SvROK(ssv))
Perl_croak(aTHX_ "Attempt to bless into a reference");
ptr = SvPV_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)
{
dVAR; dSP;
SV *sv = POPs;
STRLEN len;
const char * const elem = SvPV_const(sv, len);
GV * const gv = MUTABLE_GV(POPs);
SV * tmpRef = NULL;
sv = NULL;
if (elem) {
/* elem will always be NUL terminated. */
const char * const second_letter = elem + 1;
switch (*elem) {
case 'A':
if (len == 5 && strEQ(second_letter, "RRAY"))
tmpRef = MUTABLE_SV(GvAV(gv));
break;
case 'C':
if (len == 4 && strEQ(second_letter, "ODE"))
tmpRef = MUTABLE_SV(GvCVu(gv));
break;
case 'F':
if (len == 10 && strEQ(second_letter, "ILEHANDLE")) {
/* finally deprecated in 5.8.0 */
deprecate("*glob{FILEHANDLE}");
tmpRef = MUTABLE_SV(GvIOp(gv));
}
else
if (len == 6 && strEQ(second_letter, "ORMAT"))
tmpRef = MUTABLE_SV(GvFORM(gv));
break;
case 'G':
if (len == 4 && strEQ(second_letter, "LOB"))
tmpRef = MUTABLE_SV(gv);
break;
case 'H':
if (len == 4 && strEQ(second_letter, "ASH"))
tmpRef = MUTABLE_SV(GvHV(gv));
break;
case 'I':
if (*second_letter == 'O' && !elem[2] && len == 2)
tmpRef = MUTABLE_SV(GvIOp(gv));
break;
case 'N':
if (len == 4 && strEQ(second_letter, "AME"))
sv = newSVhek(GvNAME_HEK(gv));
break;
case 'P':
if (len == 7 && strEQ(second_letter, "ACKAGE")) {
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 (len == 6 && strEQ(second_letter, "CALAR"))
tmpRef = GvSVn(gv);
break;
}
}
if (tmpRef)
sv = newRV(tmpRef);
if (sv)
sv_2mortal(sv);
else
sv = &PL_sv_undef;
XPUSHs(sv);
RETURN;
}
/* Pattern matching */
PP(pp_study)
{
dVAR; dSP; dPOPss;
register unsigned char *s;
char *sfirst_raw;
STRLEN len;
MAGIC *mg = SvMAGICAL(sv) ? mg_find(sv, PERL_MAGIC_study) : NULL;
U8 quanta;
STRLEN size;
if (mg && SvSCREAM(sv))
RETPUSHYES;
s = (unsigned char*)(SvPV(sv, len));
if (len == 0 || len > I32_MAX || !SvPOK(sv) || SvUTF8(sv) || SvVALID(sv)) {
/* No point in studying a zero length string, and not safe to study
anything that doesn't appear to be a simple scalar (and hence might
change between now and when the regexp engine runs without our set
magic ever running) such as a reference to an object with overloaded
stringification. Also refuse to study an FBM scalar, as this gives
more flexibility in SV flag usage. No real-world code would ever
end up studying an FBM scalar, so this isn't a real pessimisation.
Endemic use of I32 in Perl_screaminstr makes it hard to safely push
the study length limit from I32_MAX to U32_MAX - 1.
*/
RETPUSHNO;
}
if (len < 0xFF) {
quanta = 1;
} else if (len < 0xFFFF) {
quanta = 2;
} else
quanta = 4;
size = (256 + len) * quanta;
sfirst_raw = (char *)safemalloc(size);
if (!sfirst_raw)
DIE(aTHX_ "do_study: out of memory");
SvSCREAM_on(sv);
if (!mg)
mg = sv_magicext(sv, NULL, PERL_MAGIC_study, &PL_vtbl_regexp, NULL, 0);
mg->mg_ptr = sfirst_raw;
mg->mg_len = size;
mg->mg_private = quanta;
memset(sfirst_raw, ~0, 256 * quanta);
/* The assumption here is that most studied strings are fairly short, hence
the pain of the extra code is worth it, given the memory savings.
80 character string, 336 bytes as U8, down from 1344 as U32
800 character string, 2112 bytes as U16, down from 4224 as U32
*/
if (quanta == 1) {
U8 *const sfirst = (U8 *)sfirst_raw;
U8 *const snext = sfirst + 256;
while (len-- > 0) {
const U8 ch = s[len];
snext[len] = sfirst[ch];
sfirst[ch] = len;
}
} else if (quanta == 2) {
U16 *const sfirst = (U16 *)sfirst_raw;
U16 *const snext = sfirst + 256;
while (len-- > 0) {
const U8 ch = s[len];
snext[len] = sfirst[ch];
sfirst[ch] = len;
}
} else {
U32 *const sfirst = (U32 *)sfirst_raw;
U32 *const snext = sfirst + 256;
while (len-- > 0) {
const U8 ch = s[len];
snext[len] = sfirst[ch];
sfirst[ch] = len;
}
}
RETPUSHYES;
}
PP(pp_trans)
{
dVAR; dSP; dTARG;
SV *sv;
if (PL_op->op_flags & OPf_STACKED)
sv = POPs;
else if (PL_op->op_private & OPpTARGET_MY)
sv = GETTARGET;
else {
sv = DEFSV;
EXTEND(SP,1);
}
TARG = sv_newmortal();
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 PUSHi(do_trans(sv));
RETURN;
}
/* Lvalue operators. */
static void
S_do_chomp(pTHX_ SV *retval, SV *sv, bool chomping)
{
dVAR;
STRLEN len;
char *s;
PERL_ARGS_ASSERT_DO_CHOMP;
if (chomping && (RsSNARF(PL_rs) || RsRECORD(PL_rs)))
return;
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))
do_chomp(retval, sv, chomping);
}
return;
}
else if (SvTYPE(sv) == SVt_PVHV) {
HV* const hv = MUTABLE_HV(sv);
HE* entry;
(void)hv_iterinit(hv);
while ((entry = hv_iternext(hv)))
do_chomp(retval, hv_iterval(hv,entry), chomping);
return;
}
else if (SvREADONLY(sv)) {
if (SvFAKE(sv)) {
/* SV is copy-on-write */
sv_force_normal_flags(sv, 0);
}
else
Perl_croak_no_modify(aTHX);
}
if (PL_encoding) {
if (!SvUTF8(sv)) {
/* XXX, here sv is utf8-ized as a side-effect!
If encoding.pm is used properly, almost string-generating
operations, including literal strings, chr(), input data, etc.
should have been utf8-ized already, right?
*/
sv_recode_to_utf8(sv, PL_encoding);
}
}
s = SvPV(sv, len);
if (chomping) {
char *temp_buffer = NULL;
SV *svrecode = NULL;
if (s && len) {
s += --len;
if (RsPARA(PL_rs)) {
if (*s != '\n')
goto nope;
++SvIVX(retval);
while (len && s[-1] == '\n') {
--len;
--s;
++SvIVX(retval);
}
}
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
*/
assert (temp_buffer == rsptr);
temp_buffer = NULL;
goto nope;
}
rsptr = temp_buffer;
}
else if (PL_encoding) {
/* RS is 8 bit, encoding.pm is used.
* Do not recode PL_rs as a side-effect. */
svrecode = newSVpvn(rsptr, rslen);
sv_recode_to_utf8(svrecode, PL_encoding);
rsptr = SvPV_const(svrecode, rslen);
rs_charlen = sv_len_utf8(svrecode);
}
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;
++SvIVX(retval);
}
else {
if (len < rslen - 1)
goto nope;
len -= rslen - 1;
s -= rslen - 1;
if (memNE(s, rsptr, rslen))
goto nope;
SvIVX(retval) += rs_charlen;
}
}
s = SvPV_force_nomg_nolen(sv);
SvCUR_set(sv, len);
*SvEND(sv) = '\0';
SvNIOK_off(sv);
SvSETMAGIC(sv);
}
nope:
SvREFCNT_dec(svrecode);
Safefree(temp_buffer);
} else {
if (len && !SvPOK(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
sv_setpvs(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
sv_setpvs(retval, "");
SvSETMAGIC(sv);
}
}
PP(pp_schop)
{
dVAR; dSP; dTARGET;
const bool chomping = PL_op->op_type == OP_SCHOMP;
if (chomping)
sv_setiv(TARG, 0);
do_chomp(TARG, TOPs, chomping);
SETTARG;
RETURN;
}
PP(pp_chop)
{
dVAR; dSP; dMARK; dTARGET; dORIGMARK;
const bool chomping = PL_op->op_type == OP_CHOMP;
if (chomping)
sv_setiv(TARG, 0);
while (MARK < SP)
do_chomp(TARG, *++MARK, chomping);
SP = ORIGMARK;
XPUSHTARG;
RETURN;
}
PP(pp_undef)
{
dVAR; dSP;
SV *sv;
if (!PL_op->op_private) {
EXTEND(SP, 1);
RETPUSHUNDEF;
}
sv = POPs;
if (!sv)
RETPUSHUNDEF;
SV_CHECK_THINKFIRST_COW_DROP(sv);
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(GvENAME_HEK(CvGV((const CV *)sv))))));
/* FALLTHROUGH */
case SVt_PVFM:
{
/* let user-undef'd sub keep its identity */
GV* const gv = CvGV((const CV *)sv);
cv_undef(MUTABLE_CV(sv));
CvGV_set(MUTABLE_CV(sv), gv);
}
break;
case SVt_PVGV:
if (SvFAKE(sv)) {
SvSetMagicSV(sv, &PL_sv_undef);