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pp_hot.c
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pp_hot.c
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/* pp_hot.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.
*
*/
/*
* Then he heard Merry change the note, and up went the Horn-cry of Buckland,
* shaking the air.
*
* Awake! Awake! Fear, Fire, Foes! Awake!
* Fire, Foes! Awake!
*
* [p.1007 of _The Lord of the Rings_, VI/viii: "The Scouring of the Shire"]
*/
/* This file contains 'hot' 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.
*
* By 'hot', we mean common ops whose execution speed is critical.
* By gathering them together into a single file, we encourage
* CPU cache hits on hot code. Also it could be taken as a warning not to
* change any code in this file unless you're sure it won't affect
* performance.
*/
#include "EXTERN.h"
#define PERL_IN_PP_HOT_C
#include "perl.h"
/* Hot code. */
PP(pp_const)
{
dVAR;
dSP;
XPUSHs(cSVOP_sv);
RETURN;
}
PP(pp_nextstate)
{
dVAR;
PL_curcop = (COP*)PL_op;
TAINT_NOT; /* Each statement is presumed innocent */
PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
FREETMPS;
PERL_ASYNC_CHECK();
return NORMAL;
}
PP(pp_gvsv)
{
dVAR;
dSP;
EXTEND(SP,1);
if (PL_op->op_private & OPpLVAL_INTRO)
PUSHs(save_scalar(cGVOP_gv));
else
PUSHs(GvSVn(cGVOP_gv));
RETURN;
}
PP(pp_null)
{
dVAR;
return NORMAL;
}
PP(pp_pushmark)
{
dVAR;
PUSHMARK(PL_stack_sp);
return NORMAL;
}
PP(pp_stringify)
{
dVAR; dSP; dTARGET;
sv_copypv(TARG,TOPs);
SETTARG;
RETURN;
}
PP(pp_gv)
{
dVAR; dSP;
XPUSHs(MUTABLE_SV(cGVOP_gv));
RETURN;
}
PP(pp_and)
{
dVAR; dSP;
PERL_ASYNC_CHECK();
if (!SvTRUE(TOPs))
RETURN;
else {
if (PL_op->op_type == OP_AND)
--SP;
RETURNOP(cLOGOP->op_other);
}
}
PP(pp_sassign)
{
dVAR; dSP; dPOPTOPssrl;
if (PL_op->op_private & OPpASSIGN_BACKWARDS) {
SV * const temp = left;
left = right; right = temp;
}
if (PL_tainting && PL_tainted && !SvTAINTED(left))
TAINT_NOT;
if (PL_op->op_private & OPpASSIGN_CV_TO_GV) {
SV * const cv = SvRV(left);
const U32 cv_type = SvTYPE(cv);
const U32 gv_type = SvTYPE(right);
const bool got_coderef = cv_type == SVt_PVCV || cv_type == SVt_PVFM;
if (!got_coderef) {
assert(SvROK(cv));
}
/* Can do the optimisation if right (LVALUE) is not a typeglob,
left (RVALUE) is a reference to something, and we're in void
context. */
if (!got_coderef && gv_type != SVt_PVGV && GIMME_V == G_VOID) {
/* Is the target symbol table currently empty? */
GV * const gv = gv_fetchsv(right, GV_NOINIT, SVt_PVGV);
if (SvTYPE(gv) != SVt_PVGV && !SvOK(gv)) {
/* Good. Create a new proxy constant subroutine in the target.
The gv becomes a(nother) reference to the constant. */
SV *const value = SvRV(cv);
SvUPGRADE(MUTABLE_SV(gv), SVt_IV);
SvPCS_IMPORTED_on(gv);
SvRV_set(gv, value);
SvREFCNT_inc_simple_void(value);
SETs(right);
RETURN;
}
}
/* Need to fix things up. */
if (gv_type != SVt_PVGV) {
/* Need to fix GV. */
right = MUTABLE_SV(gv_fetchsv(right, GV_ADD, SVt_PVGV));
}
if (!got_coderef) {
/* We've been returned a constant rather than a full subroutine,
but they expect a subroutine reference to apply. */
if (SvROK(cv)) {
ENTER_with_name("sassign_coderef");
SvREFCNT_inc_void(SvRV(cv));
/* newCONSTSUB takes a reference count on the passed in SV
from us. We set the name to NULL, otherwise we get into
all sorts of fun as the reference to our new sub is
donated to the GV that we're about to assign to.
*/
SvRV_set(left, MUTABLE_SV(newCONSTSUB(GvSTASH(right), NULL,
SvRV(cv))));
SvREFCNT_dec(cv);
LEAVE_with_name("sassign_coderef");
} else {
/* What can happen for the corner case *{"BONK"} = \&{"BONK"};
is that
First: ops for \&{"BONK"}; return us the constant in the
symbol table
Second: ops for *{"BONK"} cause that symbol table entry
(and our reference to it) to be upgraded from RV
to typeblob)
Thirdly: We get here. cv is actually PVGV now, and its
GvCV() is actually the subroutine we're looking for
So change the reference so that it points to the subroutine
of that typeglob, as that's what they were after all along.
*/
GV *const upgraded = MUTABLE_GV(cv);
CV *const source = GvCV(upgraded);
assert(source);
assert(CvFLAGS(source) & CVf_CONST);
SvREFCNT_inc_void(source);
SvREFCNT_dec(upgraded);
SvRV_set(left, MUTABLE_SV(source));
}
}
}
SvSetMagicSV(right, left);
SETs(right);
RETURN;
}
PP(pp_cond_expr)
{
dVAR; dSP;
PERL_ASYNC_CHECK();
if (SvTRUEx(POPs))
RETURNOP(cLOGOP->op_other);
else
RETURNOP(cLOGOP->op_next);
}
PP(pp_unstack)
{
dVAR;
I32 oldsave;
PERL_ASYNC_CHECK();
TAINT_NOT; /* Each statement is presumed innocent */
PL_stack_sp = PL_stack_base + cxstack[cxstack_ix].blk_oldsp;
FREETMPS;
oldsave = PL_scopestack[PL_scopestack_ix - 1];
LEAVE_SCOPE(oldsave);
return NORMAL;
}
PP(pp_concat)
{
dVAR; dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
{
dPOPTOPssrl;
bool lbyte;
STRLEN rlen;
const char *rpv = NULL;
bool rbyte = FALSE;
bool rcopied = FALSE;
if (TARG == right && right != left) {
/* mg_get(right) may happen here ... */
rpv = SvPV_const(right, rlen);
rbyte = !DO_UTF8(right);
right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
rpv = SvPV_const(right, rlen); /* no point setting UTF-8 here */
rcopied = TRUE;
}
if (TARG != left) {
STRLEN llen;
const char* const lpv = SvPV_const(left, llen); /* mg_get(left) may happen here */
lbyte = !DO_UTF8(left);
sv_setpvn(TARG, lpv, llen);
if (!lbyte)
SvUTF8_on(TARG);
else
SvUTF8_off(TARG);
}
else { /* TARG == left */
STRLEN llen;
SvGETMAGIC(left); /* or mg_get(left) may happen here */
if (!SvOK(TARG)) {
if (left == right && ckWARN(WARN_UNINITIALIZED))
report_uninit(right);
sv_setpvs(left, "");
}
(void)SvPV_nomg_const(left, llen); /* Needed to set UTF8 flag */
lbyte = !DO_UTF8(left);
if (IN_BYTES)
SvUTF8_off(TARG);
}
/* or mg_get(right) may happen here */
if (!rcopied) {
rpv = SvPV_const(right, rlen);
rbyte = !DO_UTF8(right);
}
if (lbyte != rbyte) {
if (lbyte)
sv_utf8_upgrade_nomg(TARG);
else {
if (!rcopied)
right = newSVpvn_flags(rpv, rlen, SVs_TEMP);
sv_utf8_upgrade_nomg(right);
rpv = SvPV_const(right, rlen);
}
}
sv_catpvn_nomg(TARG, rpv, rlen);
SETTARG;
RETURN;
}
}
PP(pp_padsv)
{
dVAR; dSP; dTARGET;
XPUSHs(TARG);
if (PL_op->op_flags & OPf_MOD) {
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_private & OPpDEREF) {
PUTBACK;
vivify_ref(PAD_SVl(PL_op->op_targ), PL_op->op_private & OPpDEREF);
SPAGAIN;
}
}
RETURN;
}
PP(pp_readline)
{
dVAR;
tryAMAGICunTARGET(iter, 0);
PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
if (!isGV_with_GP(PL_last_in_gv)) {
if (SvROK(PL_last_in_gv) && isGV_with_GP(SvRV(PL_last_in_gv)))
PL_last_in_gv = MUTABLE_GV(SvRV(PL_last_in_gv));
else {
dSP;
XPUSHs(MUTABLE_SV(PL_last_in_gv));
PUTBACK;
pp_rv2gv();
PL_last_in_gv = MUTABLE_GV(*PL_stack_sp--);
}
}
return do_readline();
}
PP(pp_eq)
{
dVAR; dSP; tryAMAGICbinSET(eq,0);
#ifndef NV_PRESERVES_UV
if (SvROK(TOPs) && !SvAMAGIC(TOPs) && SvROK(TOPm1s) && !SvAMAGIC(TOPm1s)) {
SP--;
SETs(boolSV(SvRV(TOPs) == SvRV(TOPp1s)));
RETURN;
}
#endif
#ifdef PERL_PRESERVE_IVUV
SvIV_please(TOPs);
if (SvIOK(TOPs)) {
/* Unless the left argument is integer in range we are going
to have to use NV maths. Hence only attempt to coerce the
right argument if we know the left is integer. */
SvIV_please(TOPm1s);
if (SvIOK(TOPm1s)) {
const bool auvok = SvUOK(TOPm1s);
const bool buvok = SvUOK(TOPs);
if (auvok == buvok) { /* ## IV == IV or UV == UV ## */
/* Casting IV to UV before comparison isn't going to matter
on 2s complement. On 1s complement or sign&magnitude
(if we have any of them) it could to make negative zero
differ from normal zero. As I understand it. (Need to
check - is negative zero implementation defined behaviour
anyway?). NWC */
const UV buv = SvUVX(POPs);
const UV auv = SvUVX(TOPs);
SETs(boolSV(auv == buv));
RETURN;
}
{ /* ## Mixed IV,UV ## */
SV *ivp, *uvp;
IV iv;
/* == is commutative so doesn't matter which is left or right */
if (auvok) {
/* top of stack (b) is the iv */
ivp = *SP;
uvp = *--SP;
} else {
uvp = *SP;
ivp = *--SP;
}
iv = SvIVX(ivp);
if (iv < 0)
/* As uv is a UV, it's >0, so it cannot be == */
SETs(&PL_sv_no);
else
/* we know iv is >= 0 */
SETs(boolSV((UV)iv == SvUVX(uvp)));
RETURN;
}
}
}
#endif
{
#if defined(NAN_COMPARE_BROKEN) && defined(Perl_isnan)
dPOPTOPnnrl;
if (Perl_isnan(left) || Perl_isnan(right))
RETSETNO;
SETs(boolSV(left == right));
#else
dPOPnv;
SETs(boolSV(TOPn == value));
#endif
RETURN;
}
}
PP(pp_preinc)
{
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_MAX)
{
SvIV_set(TOPs, SvIVX(TOPs) + 1);
SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
}
else /* Do all the PERL_PRESERVE_IVUV conditionals in sv_inc */
sv_inc(TOPs);
SvSETMAGIC(TOPs);
return NORMAL;
}
PP(pp_or)
{
dVAR; dSP;
PERL_ASYNC_CHECK();
if (SvTRUE(TOPs))
RETURN;
else {
if (PL_op->op_type == OP_OR)
--SP;
RETURNOP(cLOGOP->op_other);
}
}
PP(pp_defined)
{
dVAR; dSP;
register SV* sv;
bool defined;
const int op_type = PL_op->op_type;
const bool is_dor = (op_type == OP_DOR || op_type == OP_DORASSIGN);
if (is_dor) {
PERL_ASYNC_CHECK();
sv = TOPs;
if (!sv || !SvANY(sv)) {
if (op_type == OP_DOR)
--SP;
RETURNOP(cLOGOP->op_other);
}
}
else {
/* OP_DEFINED */
sv = POPs;
if (!sv || !SvANY(sv))
RETPUSHNO;
}
defined = FALSE;
switch (SvTYPE(sv)) {
case SVt_PVAV:
if (AvMAX(sv) >= 0 || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
defined = TRUE;
break;
case SVt_PVHV:
if (HvARRAY(sv) || SvGMAGICAL(sv) || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
defined = TRUE;
break;
case SVt_PVCV:
if (CvROOT(sv) || CvXSUB(sv))
defined = TRUE;
break;
default:
SvGETMAGIC(sv);
if (SvOK(sv))
defined = TRUE;
break;
}
if (is_dor) {
if(defined)
RETURN;
if(op_type == OP_DOR)
--SP;
RETURNOP(cLOGOP->op_other);
}
/* assuming OP_DEFINED */
if(defined)
RETPUSHYES;
RETPUSHNO;
}
PP(pp_add)
{
dVAR; dSP; dATARGET; bool useleft; SV *svl, *svr;
tryAMAGICbin(add,opASSIGN);
svl = sv_2num(TOPm1s);
svr = sv_2num(TOPs);
useleft = USE_LEFT(svl);
#ifdef PERL_PRESERVE_IVUV
/* We must see if we can perform the addition with integers if possible,
as the integer code detects overflow while the NV code doesn't.
If either argument hasn't had a numeric conversion yet attempt to get
the IV. It's important to do this now, rather than just assuming that
it's not IOK as a PV of "9223372036854775806" may not take well to NV
addition, and an SV which is NOK, NV=6.0 ought to be coerced to
integer in case the second argument is IV=9223372036854775806
We can (now) rely on sv_2iv to do the right thing, only setting the
public IOK flag if the value in the NV (or PV) slot is truly integer.
A side effect is that this also aggressively prefers integer maths over
fp maths for integer values.
How to detect overflow?
C 99 section 6.2.6.1 says
The range of nonnegative values of a signed integer type is a subrange
of the corresponding unsigned integer type, and the representation of
the same value in each type is the same. A computation involving
unsigned operands can never overflow, because a result that cannot be
represented by the resulting unsigned integer type is reduced modulo
the number that is one greater than the largest value that can be
represented by the resulting type.
(the 9th paragraph)
which I read as "unsigned ints wrap."
signed integer overflow seems to be classed as "exception condition"
If an exceptional condition occurs during the evaluation of an
expression (that is, if the result is not mathematically defined or not
in the range of representable values for its type), the behavior is
undefined.
(6.5, the 5th paragraph)
I had assumed that on 2s complement machines signed arithmetic would
wrap, hence coded pp_add and pp_subtract on the assumption that
everything perl builds on would be happy. After much wailing and
gnashing of teeth it would seem that irix64 knows its ANSI spec well,
knows that it doesn't need to, and doesn't. Bah. Anyway, the all-
unsigned code below is actually shorter than the old code. :-)
*/
SvIV_please(svr);
if (SvIOK(svr)) {
/* Unless the left argument is integer in range we are going to have to
use NV maths. Hence only attempt to coerce the right argument if
we know the left is integer. */
register UV auv = 0;
bool auvok = FALSE;
bool a_valid = 0;
if (!useleft) {
auv = 0;
a_valid = auvok = 1;
/* left operand is undef, treat as zero. + 0 is identity,
Could SETi or SETu right now, but space optimise by not adding
lots of code to speed up what is probably a rarish case. */
} else {
/* Left operand is defined, so is it IV? */
SvIV_please(svl);
if (SvIOK(svl)) {
if ((auvok = SvUOK(svl)))
auv = SvUVX(svl);
else {
register const IV aiv = SvIVX(svl);
if (aiv >= 0) {
auv = aiv;
auvok = 1; /* Now acting as a sign flag. */
} else { /* 2s complement assumption for IV_MIN */
auv = (UV)-aiv;
}
}
a_valid = 1;
}
}
if (a_valid) {
bool result_good = 0;
UV result;
register UV buv;
bool buvok = SvUOK(svr);
if (buvok)
buv = SvUVX(svr);
else {
register const IV biv = SvIVX(svr);
if (biv >= 0) {
buv = biv;
buvok = 1;
} else
buv = (UV)-biv;
}
/* ?uvok if value is >= 0. basically, flagged as UV if it's +ve,
else "IV" now, independent of how it came in.
if a, b represents positive, A, B negative, a maps to -A etc
a + b => (a + b)
A + b => -(a - b)
a + B => (a - b)
A + B => -(a + b)
all UV maths. negate result if A negative.
add if signs same, subtract if signs differ. */
if (auvok ^ buvok) {
/* Signs differ. */
if (auv >= buv) {
result = auv - buv;
/* Must get smaller */
if (result <= auv)
result_good = 1;
} else {
result = buv - auv;
if (result <= buv) {
/* result really should be -(auv-buv). as its negation
of true value, need to swap our result flag */
auvok = !auvok;
result_good = 1;
}
}
} else {
/* Signs same */
result = auv + buv;
if (result >= auv)
result_good = 1;
}
if (result_good) {
SP--;
if (auvok)
SETu( result );
else {
/* Negate result */
if (result <= (UV)IV_MIN)
SETi( -(IV)result );
else {
/* result valid, but out of range for IV. */
SETn( -(NV)result );
}
}
RETURN;
} /* Overflow, drop through to NVs. */
}
}
#endif
{
NV value = SvNV(svr);
(void)POPs;
if (!useleft) {
/* left operand is undef, treat as zero. + 0.0 is identity. */
SETn(value);
RETURN;
}
SETn( value + SvNV(svl) );
RETURN;
}
}
PP(pp_aelemfast)
{
dVAR; dSP;
AV * const av = PL_op->op_flags & OPf_SPECIAL
? MUTABLE_AV(PAD_SV(PL_op->op_targ)) : GvAV(cGVOP_gv);
const U32 lval = PL_op->op_flags & OPf_MOD;
SV** const svp = av_fetch(av, PL_op->op_private, lval);
SV *sv = (svp ? *svp : &PL_sv_undef);
EXTEND(SP, 1);
if (!lval && SvRMAGICAL(av) && SvGMAGICAL(sv)) /* see note in pp_helem() */
mg_get(sv);
PUSHs(sv);
RETURN;
}
PP(pp_join)
{
dVAR; dSP; dMARK; dTARGET;
MARK++;
do_join(TARG, *MARK, MARK, SP);
SP = MARK;
SETs(TARG);
RETURN;
}
PP(pp_pushre)
{
dVAR; dSP;
#ifdef DEBUGGING
/*
* We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
* will be enough to hold an OP*.
*/
SV* const sv = sv_newmortal();
sv_upgrade(sv, SVt_PVLV);
LvTYPE(sv) = '/';
Copy(&PL_op, &LvTARGOFF(sv), 1, OP*);
XPUSHs(sv);
#else
XPUSHs(MUTABLE_SV(PL_op));
#endif
RETURN;
}
/* Oversized hot code. */
PP(pp_print)
{
dVAR; dSP; dMARK; dORIGMARK;
IO *io;
register PerlIO *fp;
MAGIC *mg;
GV * const gv
= (PL_op->op_flags & OPf_STACKED) ? MUTABLE_GV(*++MARK) : PL_defoutgv;
if (gv && (io = GvIO(gv))
&& (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
{
had_magic:
if (MARK == ORIGMARK) {
/* If using default handle then we need to make space to
* pass object as 1st arg, so move other args up ...
*/
MEXTEND(SP, 1);
++MARK;
Move(MARK, MARK + 1, (SP - MARK) + 1, SV*);
++SP;
}
PUSHMARK(MARK - 1);
*MARK = SvTIED_obj(MUTABLE_SV(io), mg);
PUTBACK;
ENTER_with_name("call_PRINT");
if( PL_op->op_type == OP_SAY ) {
/* local $\ = "\n" */
SAVEGENERICSV(PL_ors_sv);
PL_ors_sv = newSVpvs("\n");
}
call_method("PRINT", G_SCALAR);
LEAVE_with_name("call_PRINT");
SPAGAIN;
MARK = ORIGMARK + 1;
*MARK = *SP;
SP = MARK;
RETURN;
}
if (!(io = GvIO(gv))) {
if ((GvEGVx(gv)) && (io = GvIO(GvEGV(gv)))
&& (mg = SvTIED_mg((const SV *)io, PERL_MAGIC_tiedscalar)))
goto had_magic;
if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
report_evil_fh(gv, io, PL_op->op_type);
SETERRNO(EBADF,RMS_IFI);
goto just_say_no;
}
else if (!(fp = IoOFP(io))) {
if (ckWARN2(WARN_CLOSED, WARN_IO)) {
if (IoIFP(io))
report_evil_fh(gv, io, OP_phoney_INPUT_ONLY);
else if (ckWARN2(WARN_UNOPENED,WARN_CLOSED))
report_evil_fh(gv, io, PL_op->op_type);
}
SETERRNO(EBADF,IoIFP(io)?RMS_FAC:RMS_IFI);
goto just_say_no;
}
else {
SV * const ofs = GvSV(PL_ofsgv); /* $, */
MARK++;
if (ofs && (SvGMAGICAL(ofs) || SvOK(ofs))) {
while (MARK <= SP) {
if (!do_print(*MARK, fp))
break;
MARK++;
if (MARK <= SP) {
/* don't use 'ofs' here - it may be invalidated by magic callbacks */
if (!do_print(GvSV(PL_ofsgv), fp)) {
MARK--;
break;
}
}
}
}
else {
while (MARK <= SP) {
if (!do_print(*MARK, fp))
break;
MARK++;
}
}
if (MARK <= SP)
goto just_say_no;
else {
if (PL_op->op_type == OP_SAY) {
if (PerlIO_write(fp, "\n", 1) == 0 || PerlIO_error(fp))
goto just_say_no;
}
else if (PL_ors_sv && SvOK(PL_ors_sv))
if (!do_print(PL_ors_sv, fp)) /* $\ */
goto just_say_no;
if (IoFLAGS(io) & IOf_FLUSH)
if (PerlIO_flush(fp) == EOF)
goto just_say_no;
}
}
SP = ORIGMARK;
XPUSHs(&PL_sv_yes);
RETURN;
just_say_no:
SP = ORIGMARK;
XPUSHs(&PL_sv_undef);
RETURN;
}
PP(pp_rv2av)
{
dVAR; dSP; dTOPss;
const I32 gimme = GIMME_V;
static const char an_array[] = "an ARRAY";
static const char a_hash[] = "a HASH";
const bool is_pp_rv2av = PL_op->op_type == OP_RV2AV;
const svtype type = is_pp_rv2av ? SVt_PVAV : SVt_PVHV;
if (SvROK(sv)) {
wasref:
tryAMAGICunDEREF_var(is_pp_rv2av ? to_av_amg : to_hv_amg);
sv = SvRV(sv);
if (SvTYPE(sv) != type)
DIE(aTHX_ "Not %s reference", is_pp_rv2av ? an_array : a_hash);
if (PL_op->op_flags & OPf_REF) {
SETs(sv);
RETURN;
}
else if (LVRET) {
if (gimme != G_ARRAY)
goto croak_cant_return;
SETs(sv);
RETURN;
}
else if (PL_op->op_flags & OPf_MOD
&& PL_op->op_private & OPpLVAL_INTRO)
Perl_croak(aTHX_ "%s", PL_no_localize_ref);
}
else {
if (SvTYPE(sv) == type) {
if (PL_op->op_flags & OPf_REF) {
SETs(sv);
RETURN;
}
else if (LVRET) {
if (gimme != G_ARRAY)
goto croak_cant_return;
SETs(sv);
RETURN;
}
}
else {
GV *gv;
if (!isGV_with_GP(sv)) {
if (SvGMAGICAL(sv)) {
mg_get(sv);
if (SvROK(sv))
goto wasref;
}
gv = Perl_softref2xv(aTHX_ sv, is_pp_rv2av ? an_array : a_hash,
type, &sp);
if (!gv)
RETURN;
}
else {
gv = MUTABLE_GV(sv);
}
sv = is_pp_rv2av ? MUTABLE_SV(GvAVn(gv)) : MUTABLE_SV(GvHVn(gv));
if (PL_op->op_private & OPpLVAL_INTRO)
sv = is_pp_rv2av ? MUTABLE_SV(save_ary(gv)) : MUTABLE_SV(save_hash(gv));
if (PL_op->op_flags & OPf_REF) {
SETs(sv);
RETURN;
}
else if (LVRET) {
if (gimme != G_ARRAY)
goto croak_cant_return;
SETs(sv);
RETURN;
}
}
}
if (is_pp_rv2av) {
AV *const av = MUTABLE_AV(sv);
/* The guts of pp_rv2av, with no intenting change to preserve history
(until such time as we get tools that can do blame annotation across
whitespace changes. */
if (gimme == G_ARRAY) {
const I32 maxarg = AvFILL(av) + 1;
(void)POPs; /* XXXX May be optimized away? */
EXTEND(SP, maxarg);
if (SvRMAGICAL(av)) {
U32 i;
for (i=0; i < (U32)maxarg; i++) {
SV ** const svp = av_fetch(av, i, FALSE);
/* See note in pp_helem, and bug id #27839 */
SP[i+1] = svp
? SvGMAGICAL(*svp) ? (mg_get(*svp), *svp) : *svp
: &PL_sv_undef;
}
}
else {
Copy(AvARRAY(av), SP+1, maxarg, SV*);
}
SP += maxarg;
}
else if (gimme == G_SCALAR) {
dTARGET;
const I32 maxarg = AvFILL(av) + 1;
SETi(maxarg);
}
} else {
/* The guts of pp_rv2hv */
if (gimme == G_ARRAY) { /* array wanted */
*PL_stack_sp = sv;
return do_kv();
}
else if (gimme == G_SCALAR) {
dTARGET;
TARG = Perl_hv_scalar(aTHX_ MUTABLE_HV(sv));
SPAGAIN;
SETTARG;
}
}
RETURN;
croak_cant_return:
Perl_croak(aTHX_ "Can't return %s to lvalue scalar context",
is_pp_rv2av ? "array" : "hash");
RETURN;
}
STATIC void
S_do_oddball(pTHX_ HV *hash, SV **relem, SV **firstrelem)
{
dVAR;
PERL_ARGS_ASSERT_DO_ODDBALL;
if (*relem) {
SV *tmpstr;
const HE *didstore;
if (ckWARN(WARN_MISC)) {
const char *err;
if (relem == firstrelem &&
SvROK(*relem) &&
(SvTYPE(SvRV(*relem)) == SVt_PVAV ||
SvTYPE(SvRV(*relem)) == SVt_PVHV))
{
err = "Reference found where even-sized list expected";
}
else
err = "Odd number of elements in hash assignment";
Perl_warner(aTHX_ packWARN(WARN_MISC), "%s", err);
}
tmpstr = newSV(0);
didstore = hv_store_ent(hash,*relem,tmpstr,0);
if (SvMAGICAL(hash)) {
if (SvSMAGICAL(tmpstr))
mg_set(tmpstr);
if (!didstore)
sv_2mortal(tmpstr);
}
TAINT_NOT;
}
}
PP(pp_aassign)
{
dVAR; dSP;
SV **lastlelem = PL_stack_sp;
SV **lastrelem = PL_stack_base + POPMARK;
SV **firstrelem = PL_stack_base + POPMARK + 1;
SV **firstlelem = lastrelem + 1;
register SV **relem;
register SV **lelem;
register SV *sv;
register AV *ary;
I32 gimme;
HV *hash;
I32 i;
int magic;
int duplicates = 0;
SV **firsthashrelem = NULL; /* "= 0" keeps gcc 2.95 quiet */
PL_delaymagic = DM_DELAY; /* catch simultaneous items */
gimme = GIMME_V;
/* If there's a common identifier on both sides we have to take
* special care that assigning the identifier on the left doesn't
* clobber a value on the right that's used later in the list.