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/* Copyright (C) 2003, 2004, 2007, 2008 Matthijs van Duin <xmath@cpan.org>
*
* You may distribute under the same terms as perl itself, which is either
* the GNU General Public License or the Artistic License.
*/
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifndef PERL_MAGIC_backref
#define PERL_MAGIC_backref '<'
#endif
#ifndef packWARN
#define packWARN(w) (w)
#endif
#ifndef SVs_PADSTALE
#define SVs_PADSTALE 0
#endif
#ifndef SVs_PADBUSY
#define SVs_PADBUSY 0
#endif
#define CONTAINER_FLAGS ( SVs_TEMP | SVf_BREAK | \
SVs_PADBUSY | SVs_PADTMP | SVs_PADMY | SVs_PADSTALE )
#ifdef PERL_OLD_COPY_ON_WRITE
#error "Data::Swap does not support PERL_OLD_COPY_ON_WRITE"
#endif
#ifndef PERL_COMBI_VERSION
#define PERL_COMBI_VERSION (PERL_REVISION * 1000000 + PERL_VERSION * 1000 + \
PERL_SUBVERSION)
#endif
#if (PERL_COMBI_VERSION >= 5009003)
#define custom_warn_uninit(opdesc) \
Perl_warner(aTHX_ packWARN(WARN_UNINITIALIZED), \
PL_warn_uninit, "", " in ", opdesc)
#define BACKREFS_IN_HV 1
#else
#define custom_warn_uninit(opdesc) \
Perl_warner(aTHX_ packWARN(WARN_UNINITIALIZED), \
PL_warn_uninit, " in ", opdesc)
#define BACKREFS_IN_HV 0
#endif
#if (PERL_COMBI_VERSION < 5009004)
#define DA_SWAP_OVERLOAD_ERR \
"Can't swap an overloaded object with a non-overloaded one"
#endif
#define DA_DEREF_ERR "Can't deref string (\"%.32s\")"
/* copied (and slightly simplified) from core because Perl_hv_backreferences_p
is hidden on all platforms since 5.38 */
STATIC AV **my_backreferences_p(pTHX_ HV *hv) {
if (!SvOOK(hv)) {
hv_iterinit(hv);
}
struct xpvhv_aux * const iter = HvAUX(hv);
return &(iter->xhv_backreferences);
}
STATIC AV *extract_backrefs(pTHX_ SV *sv) {
AV *av = NULL;
#if BACKREFS_IN_HV
if (SvTYPE(sv) == SVt_PVHV && SvOOK(sv)) {
AV **const avp = my_backreferences_p(aTHX_ (HV *) sv);
av = *avp;
*avp = NULL;
}
#endif
if (!av && SvRMAGICAL(sv)) {
MAGIC *const mg = mg_find(sv, PERL_MAGIC_backref);
if (mg) {
av = (AV *) mg->mg_obj;
mg->mg_obj = NULL;
mg->mg_virtual = NULL;
sv_unmagic(sv, PERL_MAGIC_backref);
}
}
return av;
}
STATIC void install_backrefs(pTHX_ SV *sv, AV *backrefs) {
if (!backrefs)
return;
#if BACKREFS_IN_HV
if (SvTYPE(sv) == SVt_PVHV) {
AV **const avp = my_backreferences_p(aTHX_ (HV *) sv);
*avp = backrefs;
return;
}
#endif
sv_magic(sv, (SV *) backrefs, PERL_MAGIC_backref, NULL, 0);
}
STATIC AV *sv_move(pTHX_ SV *dst, SV *src, AV *br)
{
AV *obr = extract_backrefs(aTHX_ src);
#if (PERL_COMBI_VERSION >= 5009003)
dst->sv_u = src->sv_u;
if (SvTYPE(src) == SVt_IV)
SvANY(dst) = (XPVIV *) ((char *) &dst->sv_u.svu_iv
- STRUCT_OFFSET(XPVIV, xiv_iv));
#if (PERL_COMBI_VERSION < 5011000)
else if (SvTYPE(src) == SVt_RV)
SvANY(dst) = &dst->sv_u.svu_rv;
#endif
else
#endif
SvANY(dst) = SvANY(src);
SvFLAGS(dst) = (SvFLAGS(dst) & CONTAINER_FLAGS) |
(SvFLAGS(src) & ~CONTAINER_FLAGS);
install_backrefs(aTHX_ dst, br);
return obr;
}
MODULE = Data::Swap PACKAGE = Data::Swap
PROTOTYPES: DISABLE
BOOT:
CvLVALUE_on(get_cv("Data::Swap::deref", TRUE));
void
deref(...)
PREINIT:
I32 i, n = 0;
I32 sref;
SV *sv;
PPCODE:
sref = (GIMME == G_SCALAR) && (PL_op->op_flags & OPf_MOD);
for (i = 0; i < items; i++) {
if (!SvROK(ST(i))) {
STRLEN z;
if (SvOK(ST(i)))
Perl_croak(aTHX_ DA_DEREF_ERR, SvPV(ST(i), z));
if (ckWARN(WARN_UNINITIALIZED))
custom_warn_uninit("deref");
if (sref)
return;
continue;
}
sv = SvRV(ST(i));
if (sref) {
PUSHs(sv);
PUTBACK;
return;
}
switch (SvTYPE(sv)) {
I32 x;
case SVt_PVAV:
if (!(x = av_len((AV *) sv) + 1))
continue;
SP += x;
break;
case SVt_PVHV:
if (!(x = HvKEYS(sv)))
continue;
SP += x * 2;
break;
case SVt_PVCV:
Perl_croak(aTHX_ "Can't deref subroutine reference");
case SVt_PVFM:
Perl_croak(aTHX_ "Can't deref format reference");
case SVt_PVIO:
Perl_croak(aTHX_ "Can't deref filehandle reference");
default:
SP++;
}
ST(n++) = ST(i);
}
EXTEND(SP, 0);
for (i = 0; n--; ) {
SV *sv = SvRV(ST(n));
I32 x = SvTYPE(sv);
if (x == SVt_PVAV) {
i -= x = AvFILL((AV *) sv) + 1;
Copy(AvARRAY((AV *) sv), SP + i + 1, x, SV *);
} else if (x == SVt_PVHV) {
HE *entry;
HV *hv = (HV *) sv;
i -= x = hv_iterinit(hv) * 2;
PUTBACK;
while ((entry = hv_iternext(hv))) {
sv = hv_iterkeysv(entry);
SPAGAIN;
SvREADONLY_on(sv);
SP[++i] = sv;
sv = hv_iterval(hv, entry);
SPAGAIN;
SP[++i] = sv;
}
i -= x;
} else {
SP[i--] = sv;
}
}
void
swap(r1, r2)
SV *r1
SV *r2
PREINIT:
AV *br;
SV t;
CODE:
#ifdef DA_SWAP_OVERLOAD_ERR
if (SvAMAGIC(r1) != SvAMAGIC(r2))
Perl_croak(aTHX_ DA_SWAP_OVERLOAD_ERR);
#endif
if (!SvROK(r1) || !(r1 = SvRV(r1)) || !SvROK(r2) || !(r2 = SvRV(r2)))
Perl_croak(aTHX_ "Not a reference");
if ((SvREADONLY(r1) && SvIMMORTAL(r1))
|| (SvREADONLY(r2) && SvIMMORTAL(r2)))
Perl_croak(aTHX_ "%s", PL_no_modify);
br = NULL;
br = sv_move(aTHX_ &t, r1, br);
br = sv_move(aTHX_ r1, r2, br);
br = sv_move(aTHX_ r2, &t, br);
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