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ListUtilXS.xs
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/* Copyright (c) 1997-2000 Graham Barr <[email protected]>. All rights reserved.
* This program is free software; you can redistribute it and/or
* modify it under the same terms as Perl itself.
*/
#define PERL_NO_GET_CONTEXT /* we want efficiency */
#include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>
#define NEED_sv_2pv_flags 1
#include "ppport.h"
#if PERL_BCDVERSION >= 0x5006000
# include "multicall.h"
#endif
#if PERL_BCDVERSION < 0x5023008
# define UNUSED_VAR_newsp PERL_UNUSED_VAR(newsp)
#else
# define UNUSED_VAR_newsp NOOP
#endif
#ifndef CvISXSUB
# define CvISXSUB(cv) CvXSUB(cv)
#endif
#ifdef SVf_IVisUV
# define slu_sv_value(sv) (SvIOK(sv)) ? (SvIOK_UV(sv)) ? (NV)(SvUVX(sv)) : (NV)(SvIVX(sv)) : (SvNV(sv))
#else
# define slu_sv_value(sv) (SvIOK(sv)) ? (NV)(SvIVX(sv)) : (SvNV(sv))
#endif
#if PERL_VERSION < 13 || (PERL_VERSION == 13 && PERL_SUBVERSION < 9)
# define PERL_HAS_BAD_MULTICALL_REFCOUNT
#endif
enum slu_accum {
ACC_IV,
ACC_NV,
ACC_SV,
};
static enum slu_accum accum_type(SV *sv) {
if(SvAMAGIC(sv))
return ACC_SV;
if(SvIOK(sv) && !SvNOK(sv) && !SvUOK(sv))
return ACC_IV;
return ACC_NV;
}
MODULE=List::Util::XS PACKAGE=List::Util::XS
void
min(...)
PROTOTYPE: @
ALIAS:
min = 0
max = 1
CODE:
{
int index;
NV retval = 0.0; /* avoid 'uninit var' warning */
SV *retsv;
int magic;
if(!items)
XSRETURN_UNDEF;
retsv = ST(0);
magic = SvAMAGIC(retsv);
if(!magic)
retval = slu_sv_value(retsv);
for(index = 1 ; index < items ; index++) {
SV *stacksv = ST(index);
SV *tmpsv;
if((magic || SvAMAGIC(stacksv)) && (tmpsv = amagic_call(retsv, stacksv, gt_amg, 0))) {
if(SvTRUE(tmpsv) ? !ix : ix) {
retsv = stacksv;
magic = SvAMAGIC(retsv);
if(!magic) {
retval = slu_sv_value(retsv);
}
}
}
else {
NV val = slu_sv_value(stacksv);
if(magic) {
retval = slu_sv_value(retsv);
magic = 0;
}
if(val < retval ? !ix : ix) {
retsv = stacksv;
retval = val;
}
}
}
ST(0) = retsv;
XSRETURN(1);
}
void
sum(...)
PROTOTYPE: @
ALIAS:
sum = 0
sum0 = 1
product = 2
CODE:
{
dXSTARG;
SV *sv;
IV retiv = 0;
NV retnv = 0.0;
SV *retsv = NULL;
int index;
enum slu_accum accum;
int is_product = (ix == 2);
SV *tmpsv;
if(!items)
switch(ix) {
case 0: XSRETURN_UNDEF;
case 1: ST(0) = newSViv(0); XSRETURN(1);
case 2: ST(0) = newSViv(1); XSRETURN(1);
}
sv = ST(0);
switch((accum = accum_type(sv))) {
case ACC_SV:
retsv = TARG;
sv_setsv(retsv, sv);
break;
case ACC_IV:
retiv = SvIV(sv);
break;
case ACC_NV:
retnv = slu_sv_value(sv);
break;
}
for(index = 1 ; index < items ; index++) {
sv = ST(index);
if(accum < ACC_SV && SvAMAGIC(sv)){
if(!retsv)
retsv = TARG;
sv_setnv(retsv, accum == ACC_NV ? retnv : retiv);
accum = ACC_SV;
}
switch(accum) {
case ACC_SV:
tmpsv = amagic_call(retsv, sv,
is_product ? mult_amg : add_amg,
SvAMAGIC(retsv) ? AMGf_assign : 0);
if(tmpsv) {
switch((accum = accum_type(tmpsv))) {
case ACC_SV:
retsv = tmpsv;
break;
case ACC_IV:
retiv = SvIV(tmpsv);
break;
case ACC_NV:
retnv = slu_sv_value(tmpsv);
break;
}
}
else {
/* fall back to default */
accum = ACC_NV;
is_product ? (retnv = SvNV(retsv) * SvNV(sv))
: (retnv = SvNV(retsv) + SvNV(sv));
}
break;
case ACC_IV:
if(is_product) {
/* TODO: Consider if product() should shortcircuit the moment its
* accumulator becomes zero
*/
/* XXX testing flags before running get_magic may
* cause some valid tied values to fallback to the NV path
* - DAPM */
if(!SvNOK(sv) && SvIOK(sv)) {
IV i = SvIV(sv);
if (retiv == 0) /* avoid later division by zero */
break;
if (retiv < 0) {
if (i < 0) {
if (i >= IV_MAX / retiv) {
retiv *= i;
break;
}
}
else {
if (i <= IV_MIN / retiv) {
retiv *= i;
break;
}
}
}
else {
if (i < 0) {
if (i >= IV_MIN / retiv) {
retiv *= i;
break;
}
}
else {
if (i <= IV_MAX / retiv) {
retiv *= i;
break;
}
}
}
}
/* else fallthrough */
}
else {
/* XXX testing flags before running get_magic may
* cause some valid tied values to fallback to the NV path
* - DAPM */
if(!SvNOK(sv) && SvIOK(sv)) {
IV i = SvIV(sv);
if (retiv >= 0 && i >= 0) {
if (retiv <= IV_MAX - i) {
retiv += i;
break;
}
/* else fallthrough */
}
else if (retiv < 0 && i < 0) {
if (retiv >= IV_MIN - i) {
retiv += i;
break;
}
/* else fallthrough */
}
else {
/* mixed signs can't overflow */
retiv += i;
break;
}
}
/* else fallthrough */
}
/* fallthrough to NV now */
retnv = retiv;
accum = ACC_NV;
case ACC_NV:
is_product ? (retnv *= slu_sv_value(sv))
: (retnv += slu_sv_value(sv));
break;
}
}
if(!retsv)
retsv = TARG;
switch(accum) {
case ACC_SV: /* nothing to do */
break;
case ACC_IV:
sv_setiv(retsv, retiv);
break;
case ACC_NV:
sv_setnv(retsv, retnv);
break;
}
ST(0) = retsv;
XSRETURN(1);
}
#define SLU_CMP_LARGER 1
#define SLU_CMP_SMALLER -1
void
minstr(...)
PROTOTYPE: @
ALIAS:
minstr = SLU_CMP_LARGER
maxstr = SLU_CMP_SMALLER
CODE:
{
SV *left;
int index;
if(!items)
XSRETURN_UNDEF;
left = ST(0);
#ifdef OPpLOCALE
if(MAXARG & OPpLOCALE) {
for(index = 1 ; index < items ; index++) {
SV *right = ST(index);
if(sv_cmp_locale(left, right) == ix)
left = right;
}
}
else {
#endif
for(index = 1 ; index < items ; index++) {
SV *right = ST(index);
if(sv_cmp(left, right) == ix)
left = right;
}
#ifdef OPpLOCALE
}
#endif
ST(0) = left;
XSRETURN(1);
}
void
reduce(block,...)
SV *block
PROTOTYPE: &@
CODE:
{
SV *ret = sv_newmortal();
int index;
GV *agv,*bgv,*gv;
HV *stash;
SV **args = &PL_stack_base[ax];
CV *cv = sv_2cv(block, &stash, &gv, 0);
if(cv == Nullcv)
croak("Not a subroutine reference");
if(items <= 1)
XSRETURN_UNDEF;
agv = gv_fetchpv("a", GV_ADD, SVt_PV);
bgv = gv_fetchpv("b", GV_ADD, SVt_PV);
SAVESPTR(GvSV(agv));
SAVESPTR(GvSV(bgv));
GvSV(agv) = ret;
SvSetMagicSV(ret, args[1]);
#ifdef dMULTICALL
if(!CvISXSUB(cv)) {
dMULTICALL;
I32 gimme = G_SCALAR;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(index = 2 ; index < items ; index++) {
GvSV(bgv) = args[index];
MULTICALL;
SvSetMagicSV(ret, *PL_stack_sp);
}
# ifdef PERL_HAS_BAD_MULTICALL_REFCOUNT
if(CvDEPTH(multicall_cv) > 1)
SvREFCNT_inc_simple_void_NN(multicall_cv);
# endif
POP_MULTICALL;
}
else
#endif
{
for(index = 2 ; index < items ; index++) {
dSP;
GvSV(bgv) = args[index];
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
SvSetMagicSV(ret, *PL_stack_sp);
}
}
ST(0) = ret;
XSRETURN(1);
}
void
first(block,...)
SV *block
PROTOTYPE: &@
CODE:
{
int index;
GV *gv;
HV *stash;
SV **args = &PL_stack_base[ax];
CV *cv = sv_2cv(block, &stash, &gv, 0);
if(cv == Nullcv)
croak("Not a subroutine reference");
if(items <= 1)
XSRETURN_UNDEF;
SAVESPTR(GvSV(PL_defgv));
#ifdef dMULTICALL
if(!CvISXSUB(cv)) {
dMULTICALL;
I32 gimme = G_SCALAR;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(index = 1 ; index < items ; index++) {
SV *def_sv = GvSV(PL_defgv) = args[index];
# ifdef SvTEMP_off
SvTEMP_off(def_sv);
# endif
MULTICALL;
if(SvTRUEx(*PL_stack_sp)) {
# ifdef PERL_HAS_BAD_MULTICALL_REFCOUNT
if(CvDEPTH(multicall_cv) > 1)
SvREFCNT_inc_simple_void_NN(multicall_cv);
# endif
POP_MULTICALL;
ST(0) = ST(index);
XSRETURN(1);
}
}
# ifdef PERL_HAS_BAD_MULTICALL_REFCOUNT
if(CvDEPTH(multicall_cv) > 1)
SvREFCNT_inc_simple_void_NN(multicall_cv);
# endif
POP_MULTICALL;
}
else
#endif
{
for(index = 1 ; index < items ; index++) {
dSP;
GvSV(PL_defgv) = args[index];
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
if(SvTRUEx(*PL_stack_sp)) {
ST(0) = ST(index);
XSRETURN(1);
}
}
}
XSRETURN_UNDEF;
}
void
any(block,...)
SV *block
ALIAS:
none = 0
all = 1
any = 2
notall = 3
PROTOTYPE: &@
PPCODE:
{
int ret_true = !(ix & 2); /* return true at end of loop for none/all; false for any/notall */
int invert = (ix & 1); /* invert block test for all/notall */
GV *gv;
HV *stash;
SV **args = &PL_stack_base[ax];
CV *cv = sv_2cv(block, &stash, &gv, 0);
if(cv == Nullcv)
croak("Not a subroutine reference");
SAVESPTR(GvSV(PL_defgv));
#ifdef dMULTICALL
if(!CvISXSUB(cv)) {
dMULTICALL;
I32 gimme = G_SCALAR;
int index;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(index = 1; index < items; index++) {
SV *def_sv = GvSV(PL_defgv) = args[index];
# ifdef SvTEMP_off
SvTEMP_off(def_sv);
# endif
MULTICALL;
if(SvTRUEx(*PL_stack_sp) ^ invert) {
POP_MULTICALL;
ST(0) = ret_true ? &PL_sv_no : &PL_sv_yes;
XSRETURN(1);
}
}
POP_MULTICALL;
}
else
#endif
{
int index;
for(index = 1; index < items; index++) {
dSP;
GvSV(PL_defgv) = args[index];
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
if(SvTRUEx(*PL_stack_sp) ^ invert) {
ST(0) = ret_true ? &PL_sv_no : &PL_sv_yes;
XSRETURN(1);
}
}
}
ST(0) = ret_true ? &PL_sv_yes : &PL_sv_no;
XSRETURN(1);
}
void
pairs(...)
PROTOTYPE: @
PPCODE:
{
int argi = 0;
int reti = 0;
HV *pairstash = get_hv("List::Util::XS::_Pair::", GV_ADD);
if(items % 2 && ckWARN(WARN_MISC))
warn("Odd number of elements in pairs");
{
for(; argi < items; argi += 2) {
SV *a = ST(argi);
SV *b = argi < items-1 ? ST(argi+1) : &PL_sv_undef;
AV *av = newAV();
av_push(av, newSVsv(a));
av_push(av, newSVsv(b));
ST(reti) = sv_2mortal(newRV_noinc((SV *)av));
sv_bless(ST(reti), pairstash);
reti++;
}
}
XSRETURN(reti);
}
void
unpairs(...)
PROTOTYPE: @
PPCODE:
{
/* Unlike pairs(), we're going to trash the input values on the stack
* almost as soon as we start generating output. So clone them first
*/
int i;
SV **args_copy;
Newx(args_copy, items, SV *);
SAVEFREEPV(args_copy);
Copy(&ST(0), args_copy, items, SV *);
for(i = 0; i < items; i++) {
SV *pair = args_copy[i];
AV *pairav;
SvGETMAGIC(pair);
if(SvTYPE(pair) != SVt_RV)
croak("Not a reference at List::Util::XS::unpairs() argument %d", i);
if(SvTYPE(SvRV(pair)) != SVt_PVAV)
croak("Not an ARRAY reference at List::Util::XS::unpairs() argument %d", i);
/* TODO: assert pair is an ARRAY ref */
pairav = (AV *)SvRV(pair);
EXTEND(SP, 2);
if(AvFILL(pairav) >= 0)
mPUSHs(newSVsv(AvARRAY(pairav)[0]));
else
PUSHs(&PL_sv_undef);
if(AvFILL(pairav) >= 1)
mPUSHs(newSVsv(AvARRAY(pairav)[1]));
else
PUSHs(&PL_sv_undef);
}
XSRETURN(items * 2);
}
void
pairkeys(...)
PROTOTYPE: @
PPCODE:
{
int argi = 0;
int reti = 0;
if(items % 2 && ckWARN(WARN_MISC))
warn("Odd number of elements in pairkeys");
{
for(; argi < items; argi += 2) {
SV *a = ST(argi);
ST(reti++) = sv_2mortal(newSVsv(a));
}
}
XSRETURN(reti);
}
void
pairvalues(...)
PROTOTYPE: @
PPCODE:
{
int argi = 0;
int reti = 0;
if(items % 2 && ckWARN(WARN_MISC))
warn("Odd number of elements in pairvalues");
{
for(; argi < items; argi += 2) {
SV *b = argi < items-1 ? ST(argi+1) : &PL_sv_undef;
ST(reti++) = sv_2mortal(newSVsv(b));
}
}
XSRETURN(reti);
}
void
pairfirst(block,...)
SV *block
PROTOTYPE: &@
PPCODE:
{
GV *agv,*bgv,*gv;
HV *stash;
CV *cv = sv_2cv(block, &stash, &gv, 0);
I32 ret_gimme = GIMME_V;
int argi = 1; /* "shift" the block */
if(!(items % 2) && ckWARN(WARN_MISC))
warn("Odd number of elements in pairfirst");
agv = gv_fetchpv("a", GV_ADD, SVt_PV);
bgv = gv_fetchpv("b", GV_ADD, SVt_PV);
SAVESPTR(GvSV(agv));
SAVESPTR(GvSV(bgv));
#ifdef dMULTICALL
if(!CvISXSUB(cv)) {
/* Since MULTICALL is about to move it */
SV **stack = PL_stack_base + ax;
dMULTICALL;
I32 gimme = G_SCALAR;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(; argi < items; argi += 2) {
SV *a = GvSV(agv) = stack[argi];
SV *b = GvSV(bgv) = argi < items-1 ? stack[argi+1] : &PL_sv_undef;
MULTICALL;
if(!SvTRUEx(*PL_stack_sp))
continue;
POP_MULTICALL;
if(ret_gimme == G_ARRAY) {
ST(0) = sv_mortalcopy(a);
ST(1) = sv_mortalcopy(b);
XSRETURN(2);
}
else
XSRETURN_YES;
}
POP_MULTICALL;
XSRETURN(0);
}
else
#endif
{
for(; argi < items; argi += 2) {
dSP;
SV *a = GvSV(agv) = ST(argi);
SV *b = GvSV(bgv) = argi < items-1 ? ST(argi+1) : &PL_sv_undef;
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
SPAGAIN;
if(!SvTRUEx(*PL_stack_sp))
continue;
if(ret_gimme == G_ARRAY) {
ST(0) = sv_mortalcopy(a);
ST(1) = sv_mortalcopy(b);
XSRETURN(2);
}
else
XSRETURN_YES;
}
}
XSRETURN(0);
}
void
pairgrep(block,...)
SV *block
PROTOTYPE: &@
PPCODE:
{
GV *agv,*bgv,*gv;
HV *stash;
CV *cv = sv_2cv(block, &stash, &gv, 0);
I32 ret_gimme = GIMME_V;
/* This function never returns more than it consumed in arguments. So we
* can build the results "live", behind the arguments
*/
int argi = 1; /* "shift" the block */
int reti = 0;
if(!(items % 2) && ckWARN(WARN_MISC))
warn("Odd number of elements in pairgrep");
agv = gv_fetchpv("a", GV_ADD, SVt_PV);
bgv = gv_fetchpv("b", GV_ADD, SVt_PV);
SAVESPTR(GvSV(agv));
SAVESPTR(GvSV(bgv));
#ifdef dMULTICALL
if(!CvISXSUB(cv)) {
/* Since MULTICALL is about to move it */
SV **stack = PL_stack_base + ax;
int i;
dMULTICALL;
I32 gimme = G_SCALAR;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(; argi < items; argi += 2) {
SV *a = GvSV(agv) = stack[argi];
SV *b = GvSV(bgv) = argi < items-1 ? stack[argi+1] : &PL_sv_undef;
MULTICALL;
if(SvTRUEx(*PL_stack_sp)) {
if(ret_gimme == G_ARRAY) {
/* We can't mortalise yet or they'd be mortal too early */
stack[reti++] = newSVsv(a);
stack[reti++] = newSVsv(b);
}
else if(ret_gimme == G_SCALAR)
reti++;
}
}
POP_MULTICALL;
if(ret_gimme == G_ARRAY)
for(i = 0; i < reti; i++)
sv_2mortal(stack[i]);
}
else
#endif
{
for(; argi < items; argi += 2) {
dSP;
SV *a = GvSV(agv) = ST(argi);
SV *b = GvSV(bgv) = argi < items-1 ? ST(argi+1) : &PL_sv_undef;
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
SPAGAIN;
if(SvTRUEx(*PL_stack_sp)) {
if(ret_gimme == G_ARRAY) {
ST(reti++) = sv_mortalcopy(a);
ST(reti++) = sv_mortalcopy(b);
}
else if(ret_gimme == G_SCALAR)
reti++;
}
}
}
if(ret_gimme == G_ARRAY)
XSRETURN(reti);
else if(ret_gimme == G_SCALAR) {
ST(0) = newSViv(reti);
XSRETURN(1);
}
}
void
pairmap(block,...)
SV *block
PROTOTYPE: &@
PPCODE:
{
GV *agv,*bgv,*gv;
HV *stash;
CV *cv = sv_2cv(block, &stash, &gv, 0);
SV **args_copy = NULL;
I32 ret_gimme = GIMME_V;
int argi = 1; /* "shift" the block */
int reti = 0;
if(!(items % 2) && ckWARN(WARN_MISC))
warn("Odd number of elements in pairmap");
agv = gv_fetchpv("a", GV_ADD, SVt_PV);
bgv = gv_fetchpv("b", GV_ADD, SVt_PV);
SAVESPTR(GvSV(agv));
SAVESPTR(GvSV(bgv));
/* This MULTICALL-based code appears to fail on perl 5.10.0 and 5.8.9
* Skip it on those versions (RT#87857)
*/
#if defined(dMULTICALL) && (PERL_BCDVERSION > 0x5010000 || PERL_BCDVERSION < 0x5008009)
if(!CvISXSUB(cv)) {
/* Since MULTICALL is about to move it */
SV **stack = PL_stack_base + ax;
I32 ret_gimme = GIMME_V;
int i;
dMULTICALL;
I32 gimme = G_ARRAY;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(; argi < items; argi += 2) {
int count;
GvSV(agv) = args_copy ? args_copy[argi] : stack[argi];
GvSV(bgv) = argi < items-1 ?
(args_copy ? args_copy[argi+1] : stack[argi+1]) :
&PL_sv_undef;
MULTICALL;
count = PL_stack_sp - PL_stack_base;
if(count > 2 && !args_copy) {
/* We can't return more than 2 results for a given input pair
* without trashing the remaining argmuents on the stack still
* to be processed. So, we'll copy them out to a temporary
* buffer and work from there instead.
* We didn't do this initially because in the common case, most
* code blocks will return only 1 or 2 items so it won't be
* necessary
*/
int n_args = items - argi;
Newx(args_copy, n_args, SV *);
SAVEFREEPV(args_copy);
Copy(stack + argi, args_copy, n_args, SV *);
argi = 0;
items = n_args;
}
for(i = 0; i < count; i++)
stack[reti++] = newSVsv(PL_stack_sp[i - count + 1]);
}
POP_MULTICALL;
if(ret_gimme == G_ARRAY)
for(i = 0; i < reti; i++)
sv_2mortal(stack[i]);
}
else
#endif
{
for(; argi < items; argi += 2) {
dSP;
int count;
int i;
GvSV(agv) = args_copy ? args_copy[argi] : ST(argi);
GvSV(bgv) = argi < items-1 ?
(args_copy ? args_copy[argi+1] : ST(argi+1)) :
&PL_sv_undef;
PUSHMARK(SP);
count = call_sv((SV*)cv, G_ARRAY);
SPAGAIN;
if(count > 2 && !args_copy && ret_gimme == G_ARRAY) {
int n_args = items - argi;
Newx(args_copy, n_args, SV *);
SAVEFREEPV(args_copy);
Copy(&ST(argi), args_copy, n_args, SV *);
argi = 0;
items = n_args;
}
if(ret_gimme == G_ARRAY)
for(i = 0; i < count; i++)
ST(reti++) = sv_mortalcopy(SP[i - count + 1]);
else
reti += count;
PUTBACK;
}
}
if(ret_gimme == G_ARRAY)
XSRETURN(reti);
ST(0) = sv_2mortal(newSViv(reti));
XSRETURN(1);
}
void
shuffle(...)
PROTOTYPE: @
CODE:
{
int index;
#if (PERL_VERSION < 9)
struct op dmy_op;
struct op *old_op = PL_op;
/* We call pp_rand here so that Drand01 get initialized if rand()
or srand() has not already been called
*/
memzero((char*)(&dmy_op), sizeof(struct op));
/* we let pp_rand() borrow the TARG allocated for this XS sub */
dmy_op.op_targ = PL_op->op_targ;
PL_op = &dmy_op;
(void)*(PL_ppaddr[OP_RAND])(aTHX);
PL_op = old_op;
#else
/* Initialize Drand01 if rand() or srand() has
not already been called
*/
if(!PL_srand_called) {
(void)seedDrand01((Rand_seed_t)Perl_seed(aTHX));
PL_srand_called = TRUE;
}
#endif
for (index = items ; index > 1 ; ) {
int swap = (int)(Drand01() * (double)(index--));
SV *tmp = ST(swap);
ST(swap) = ST(index);
ST(index) = tmp;
}
XSRETURN(items);
}
void
uniq(...)
PROTOTYPE: @
ALIAS:
uniqnum = 0
uniqstr = 1
uniq = 2
CODE:
{
int retcount = 0;
int index;
SV **args = &PL_stack_base[ax];
HV *seen;
#ifdef HV_FETCH_EMPTY_HE
HE *he;
#endif
if(items == 0 || (items == 1 && !SvGAMAGIC(args[0]) && SvOK(args[0]))) {
/* Optimise for the case of the empty list or a defined nonmagic
* singleton. Leave a singleton magical||undef for the regular case */
retcount = items;
goto finish;
}
sv_2mortal((SV *)(seen = newHV()));
if(ix == 0) {
/* uniqnum */
/* A temporary buffer for number stringification */
SV *keysv = sv_newmortal();
for(index = 0 ; index < items ; index++) {
SV *arg = args[index];
if(SvGAMAGIC(arg))
/* clone the value so we don't invoke magic again */