forked from schacon/perl
/
pp.c
6003 lines (5520 loc) · 144 KB
/
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 (LVRET) {
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 (LVRET) {
if (GIMME == G_SCALAR)
Perl_croak(aTHX_ "Can't return hash to lvalue scalar context");
RETURN;
}
gimme = GIMME_V;
if (gimme == G_ARRAY) {
RETURNOP(do_kv());
}
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";
PP(pp_rv2gv)
{
dVAR; dSP; dTOPss;
if (SvROK(sv)) {
wasref:
tryAMAGICunDEREF(to_gv);
sv = SvRV(sv);
if (SvTYPE(sv) == SVt_PVIO) {
GV * const gv = MUTABLE_GV(sv_newmortal());
gv_init(gv, 0, "", 0, 0);
GvIOp(gv) = MUTABLE_IO(sv);
SvREFCNT_inc_void_NN(sv);
sv = MUTABLE_SV(gv);
}
else if (!isGV_with_GP(sv))
DIE(aTHX_ "Not a GLOB reference");
}
else {
if (!isGV_with_GP(sv)) {
if (SvGMAGICAL(sv)) {
mg_get(sv);
if (SvROK(sv))
goto wasref;
}
if (!SvOK(sv) && sv != &PL_sv_undef) {
/* If this is a 'my' scalar and flag is set then vivify
* NI-S 1999/05/07
*/
if (SvREADONLY(sv))
Perl_croak(aTHX_ "%s", PL_no_modify);
if (PL_op->op_private & OPpDEREF) {
GV *gv;
if (cUNOP->op_targ) {
STRLEN len;
SV * const namesv = PAD_SV(cUNOP->op_targ);
const char * const name = SvPV(namesv, len);
gv = MUTABLE_GV(newSV(0));
gv_init(gv, CopSTASH(PL_curcop), name, len, 0);
}
else {
const char * const name = CopSTASHPV(PL_curcop);
gv = newGVgen(name);
}
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 ||
PL_op->op_private & HINT_STRICT_REFS)
DIE(aTHX_ PL_no_usym, "a symbol");
if (ckWARN(WARN_UNINITIALIZED))
report_uninit(sv);
RETSETUNDEF;
}
if ((PL_op->op_flags & OPf_SPECIAL) &&
!(PL_op->op_flags & OPf_MOD))
{
SV * const temp = MUTABLE_SV(gv_fetchsv(sv, 0, SVt_PVGV));
if (!temp
&& (!is_gv_magical_sv(sv,0)
|| !(sv = MUTABLE_SV(gv_fetchsv(sv, GV_ADD,
SVt_PVGV))))) {
RETSETUNDEF;
}
sv = temp;
}
else {
if (PL_op->op_private & HINT_STRICT_REFS)
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 = MUTABLE_SV(gv_fetchsv(sv, GV_ADD, SVt_PVGV));
}
}
}
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)
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))
{
gv = gv_fetchsv(sv, 0, type);
if (!gv
&& (!is_gv_magical_sv(sv,0)
|| !(gv = gv_fetchsv(sv, GV_ADD, type))))
{
**spp = &PL_sv_undef;
return NULL;
}
}
else {
gv = gv_fetchsv(sv, GV_ADD, type);
}
return gv;
}
PP(pp_rv2sv)
{
dVAR; dSP; dTOPss;
GV *gv = NULL;
if (SvROK(sv)) {
wasref:
tryAMAGICunDEREF(to_sv);
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)) {
if (SvGMAGICAL(sv)) {
mg_get(sv);
if (SvROK(sv))
goto wasref;
}
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)
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)) + CopARYBASE_get(PL_curcop)
)));
}
RETURN;
}
PP(pp_pos)
{
dVAR; dSP; dTARGET; dPOPss;
if (PL_op->op_flags & OPf_MOD || LVRET) {
if (SvTYPE(TARG) < SVt_PVLV) {
sv_upgrade(TARG, SVt_PVLV);
sv_magic(TARG, NULL, PERL_MAGIC_pos, NULL, 0);
}
LvTYPE(TARG) = '.';
if (LvTARG(TARG) != sv) {
SvREFCNT_dec(LvTARG(TARG));
LvTARG(TARG) = SvREFCNT_inc_simple(sv);
}
PUSHs(TARG); /* 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) {
I32 i = mg->mg_len;
if (DO_UTF8(sv))
sv_pos_b2u(sv, &i);
PUSHi(i + CopARYBASE_get(PL_curcop));
RETURN;
}
}
RETPUSHUNDEF;
}
}
PP(pp_rv2cv)
{
dVAR; dSP;
GV *gv;
HV *stash_unused;
const I32 flags = (PL_op->op_flags & OPf_SPECIAL)
? 0
: ((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_autoload4(GvSTASH(gv), GvNAME(gv), GvNAMELEN(gv), FALSE)))
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 < 0) { /* Overridable. */
#define MAX_ARGS_OP ((sizeof(I32) - 1) * 2)
int i = 0, n = 0, seen_question = 0, defgv = 0;
I32 oa;
char str[ MAX_ARGS_OP * 2 + 2 ]; /* One ';', one '\0' */
if (code == -KEY_chop || code == -KEY_chomp
|| code == -KEY_exec || code == -KEY_system)
goto set;
if (code == -KEY_mkdir) {
ret = newSVpvs_flags("_;$", SVs_TEMP);
goto set;
}
if (code == -KEY_keys || code == -KEY_values || code == -KEY_each) {
ret = newSVpvs_flags("\\[@%]", SVs_TEMP);
goto set;
}
if (code == -KEY_readpipe) {
s = "CORE::backtick";
}
while (i < MAXO) { /* The slow way. */
if (strEQ(s + 6, PL_op_name[i])
|| strEQ(s + 6, PL_op_desc[i]))
{
goto found;
}
i++;
}
goto nonesuch; /* Should not happen... */
found:
defgv = PL_opargs[i] & OA_DEFGV;
oa = PL_opargs[i] >> OASHIFT;
while (oa) {
if (oa & OA_OPTIONAL && !seen_question && !defgv) {
seen_question = 1;
str[n++] = ';';
}
if ((oa & (OA_OPTIONAL - 1)) >= OA_AVREF
&& (oa & (OA_OPTIONAL - 1)) <= OA_SCALARREF
/* But globs are already references (kinda) */
&& (oa & (OA_OPTIONAL - 1)) != OA_FILEREF
) {
str[n++] = '\\';
}
str[n++] = ("?$@@%&*$")[oa & (OA_OPTIONAL - 1)];
oa = oa >> 4;
}
if (defgv && str[n - 1] == '$')
str[n - 1] = '_';
str[n++] = '\0';
ret = newSVpvn_flags(str, n - 1, SVs_TEMP);
}
else if (code) /* Non-Overridable */
goto set;
else { /* None such */
nonesuch:
DIE(aTHX_ "Can't find an opnumber for \"%s\"", s+6);
}
}
}
cv = sv_2cv(TOPs, &stash, &gv, 0);
if (cv && SvPOK(cv))
ret = newSVpvn_flags(SvPVX_const(cv), SvCUR(cv), SVs_TEMP);
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;
const char *pv;
SV * const sv = POPs;
if (sv)
SvGETMAGIC(sv);
if (!sv || !SvROK(sv))
RETPUSHNO;
pv = sv_reftype(SvRV(sv),TRUE);
PUSHp(pv, strlen(pv));
RETURN;
}
PP(pp_bless)
{
dVAR; dSP;
HV *stash;
if (MAXARG == 1)
stash = CopSTASH(PL_curcop);
else {
SV * const ssv = POPs;
STRLEN len;
const char *ptr;
if (ssv && !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);
}
(void)sv_bless(TOPs, stash);
RETURN;
}
PP(pp_gelem)
{
dVAR; dSP;
SV *sv = POPs;
const char * const elem = SvPV_nolen_const(sv);
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 (strEQ(second_letter, "RRAY"))
tmpRef = MUTABLE_SV(GvAV(gv));
break;
case 'C':
if (strEQ(second_letter, "ODE"))
tmpRef = MUTABLE_SV(GvCVu(gv));
break;
case 'F':
if (strEQ(second_letter, "ILEHANDLE")) {
/* finally deprecated in 5.8.0 */
deprecate("*glob{FILEHANDLE}");
tmpRef = MUTABLE_SV(GvIOp(gv));
}
else
if (strEQ(second_letter, "ORMAT"))
tmpRef = MUTABLE_SV(GvFORM(gv));
break;
case 'G':
if (strEQ(second_letter, "LOB"))
tmpRef = MUTABLE_SV(gv);
break;
case 'H':
if (strEQ(second_letter, "ASH"))
tmpRef = MUTABLE_SV(GvHV(gv));
break;
case 'I':
if (*second_letter == 'O' && !elem[2])
tmpRef = MUTABLE_SV(GvIOp(gv));
break;
case 'N':
if (strEQ(second_letter, "AME"))
sv = newSVhek(GvNAME_HEK(gv));
break;
case 'P':
if (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 (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;
register I32 pos;
register I32 ch;
register I32 *sfirst;
register I32 *snext;
STRLEN len;
if (sv == PL_lastscream) {
if (SvSCREAM(sv))
RETPUSHYES;
}
s = (unsigned char*)(SvPV(sv, len));
pos = len;
if (pos <= 0 || !SvPOK(sv) || SvUTF8(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. */
RETPUSHNO;
}
if (PL_lastscream) {
SvSCREAM_off(PL_lastscream);
SvREFCNT_dec(PL_lastscream);
}
PL_lastscream = SvREFCNT_inc_simple(sv);
s = (unsigned char*)(SvPV(sv, len));
pos = len;
if (pos <= 0)
RETPUSHNO;
if (pos > PL_maxscream) {
if (PL_maxscream < 0) {
PL_maxscream = pos + 80;
Newx(PL_screamfirst, 256, I32);
Newx(PL_screamnext, PL_maxscream, I32);
}
else {
PL_maxscream = pos + pos / 4;
Renew(PL_screamnext, PL_maxscream, I32);
}
}
sfirst = PL_screamfirst;
snext = PL_screamnext;
if (!sfirst || !snext)
DIE(aTHX_ "do_study: out of memory");
for (ch = 256; ch; --ch)
*sfirst++ = -1;
sfirst -= 256;
while (--pos >= 0) {
register const I32 ch = s[pos];
if (sfirst[ch] >= 0)
snext[pos] = sfirst[ch] - pos;
else
snext[pos] = -pos;
sfirst[ch] = pos;
}
SvSCREAM_on(sv);
/* piggyback on m//g magic */
sv_magic(sv, NULL, PERL_MAGIC_regex_global, NULL, 0);
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();
PUSHi(do_trans(sv));
RETURN;
}
/* Lvalue operators. */
PP(pp_schop)
{
dVAR; dSP; dTARGET;
do_chop(TARG, TOPs);
SETTARG;
RETURN;
}
PP(pp_chop)
{
dVAR; dSP; dMARK; dTARGET; dORIGMARK;
while (MARK < SP)
do_chop(TARG, *++MARK);
SP = ORIGMARK;
XPUSHTARG;
RETURN;
}
PP(pp_schomp)
{
dVAR; dSP; dTARGET;
SETi(do_chomp(TOPs));
RETURN;
}
PP(pp_chomp)
{
dVAR; dSP; dMARK; dTARGET;
register I32 count = 0;
while (SP > MARK)
count += do_chomp(POPs);
XPUSHi(count);
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 %s undefined",
CvANON((const CV *)sv) ? "(anonymous)"
: GvENAME(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((const CV *)sv) = gv;
}
break;
case SVt_PVGV:
if (SvFAKE(sv)) {
SvSetMagicSV(sv, &PL_sv_undef);
break;
}
else if (isGV_with_GP(sv)) {
GP *gp;
HV *stash;
/* undef *Foo:: */
if((stash = GvHV((const GV *)sv)) && HvNAME_get(stash))
mro_isa_changed_in(stash);
/* undef *Pkg::meth_name ... */
else if(GvCVu((const GV *)sv) && (stash = GvSTASH((const GV *)sv))
&& HvNAME_get(stash))
mro_method_changed_in(stash);
gp_free(MUTABLE_GV(sv));
Newxz(gp, 1, GP);
GvGP(sv) = gp_ref(gp);
GvSV(sv) = newSV(0);
GvLINE(sv) = CopLINE(PL_curcop);
GvEGV(sv) = MUTABLE_GV(sv);
GvMULTI_on(sv);
break;
}
/* FALL THROUGH */
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);
}
RETPUSHUNDEF;
}
PP(pp_predec)
{
dVAR; dSP;
if (SvTYPE(TOPs) >= SVt_PVAV || isGV_with_GP(TOPs))
DIE(aTHX_ "%s", PL_no_modify);
if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
&& SvIVX(TOPs) != IV_MIN)
{
SvIV_set(TOPs, SvIVX(TOPs) - 1);
SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
}
else
sv_dec(TOPs);
SvSETMAGIC(TOPs);
return NORMAL;
}
PP(pp_postinc)
{
dVAR; dSP; dTARGET;
if (SvTYPE(TOPs) >= SVt_PVAV || isGV_with_GP(TOPs))
DIE(aTHX_ "%s", PL_no_modify);
sv_setsv(TARG, TOPs);
if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
&& SvIVX(TOPs) != IV_MAX)
{
SvIV_set(TOPs, SvIVX(TOPs) + 1);
SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
}
else
sv_inc(TOPs);
SvSETMAGIC(TOPs);
/* special case for undef: see thread at 2003-03/msg00536.html in archive */
if (!SvOK(TARG))
sv_setiv(TARG, 0);
SETs(TARG);
return NORMAL;
}
PP(pp_postdec)
{
dVAR; dSP; dTARGET;
if (SvTYPE(TOPs) >= SVt_PVAV || isGV_with_GP(TOPs))
DIE(aTHX_ "%s", PL_no_modify);
sv_setsv(TARG, TOPs);
if (!SvREADONLY(TOPs) && SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs)
&& SvIVX(TOPs) != IV_MIN)
{
SvIV_set(TOPs, SvIVX(TOPs) - 1);
SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
}
else
sv_dec(TOPs);
SvSETMAGIC(TOPs);
SETs(TARG);
return NORMAL;
}
/* Ordinary operators. */
PP(pp_pow)
{
dVAR; dSP; dATARGET; SV *svl, *svr;
#ifdef PERL_PRESERVE_IVUV
bool is_int = 0;
#endif
tryAMAGICbin(pow,opASSIGN);
svl = sv_2num(TOPm1s);
svr = sv_2num(TOPs);
#ifdef PERL_PRESERVE_IVUV
/* For integer to integer power, we do the calculation by hand wherever
we're sure it is safe; otherwise we call pow() and try to convert to
integer afterwards. */
{
SvIV_please(svr);
if (SvIOK(svr)) {
SvIV_please(svl);
if (SvIOK(svl)) {
UV power;
bool baseuok;
UV baseuv;
if (SvUOK(svr)) {
power = SvUVX(svr);
} else {
const IV iv = SvIVX(svr);
if (iv >= 0) {
power = iv;
} else {
goto float_it; /* Can't do negative powers this way. */
}
}
baseuok = SvUOK(svl);
if (baseuok) {
baseuv = SvUVX(svl);
} else {
const IV iv = SvIVX(svl);
if (iv >= 0) {
baseuv = iv;
baseuok = TRUE; /* effectively it's a UV now */
} else {
baseuv = -iv; /* abs, baseuok == false records sign */
}
}
/* now we have integer ** positive integer. */
is_int = 1;
/* foo & (foo - 1) is zero only for a power of 2. */
if (!(baseuv & (baseuv - 1))) {
/* We are raising power-of-2 to a positive integer.
The logic here will work for any base (even non-integer
bases) but it can be less accurate than
pow (base,power) or exp (power * log (base)) when the
intermediate values start to spill out of the mantissa.
With powers of 2 we know this can't happen.
And powers of 2 are the favourite thing for perl