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executable file 348 lines (304 sloc) 9.435 kb
#include <assert.h>
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#define CLONE_KEY(x) ((char *) &x)
#define CLONE_STORE(x,y) \
do { \
if (!hv_store(hseen, CLONE_KEY(x), PTRSIZE, SvREFCNT_inc(y), 0)) { \
SvREFCNT_dec(y); /* Restore the refcount */ \
croak("Can't store clone in seen hash (hseen)"); \
} \
else { \
TRACEME(("storing ref = 0x%x clone = 0x%x\n", ref, clone)); \
TRACEME(("clone = 0x%x(%d)\n", clone, SvREFCNT(clone))); \
TRACEME(("ref = 0x%x(%d)\n", ref, SvREFCNT(ref))); \
} \
} while (0)
#define CLONE_FETCH(x) (hv_fetch(hseen, CLONE_KEY(x), PTRSIZE, 0))
static SV *hv_clone (SV *, SV *, HV *, int);
static SV *av_clone (SV *, SV *, HV *, int);
static SV *sv_clone (SV *, HV *, int);
static SV *rv_clone (SV *, HV *, int);
static void _sv_string_to_bytes(SV *);
#ifdef DEBUG_CLONE
#define TRACEME(a) printf("%s:%d: ",__FUNCTION__, __LINE__) && printf a;
#else
#define TRACEME(a)
#endif
static void _sv_string_to_bytes(SV* sv) {
TRACEME(("_sv_string_to_bytes called\n"));
/* if this actually contains a string */
if (SvPOK(sv)) {
TRACEME(("Turning scalar string into bytes!\n"));
/* if this doesn't have the utf-8 flag on already then we need to
upgrade this in place so that the internal byte representation of
this string is in UTF-8. */
if (!SvUTF8(sv))
sv_utf8_upgrade(sv);
/* flipping the flag off will turn the internal utf-8 bytes that
make up the string into first class characters, turning the string
into bytes. */
SvUTF8_off(sv);
}
}
static SV *
hv_clone (SV * ref, SV * target, HV* hseen, int depth)
{
HV *clone = (HV *) target;
HV *self = (HV *) ref;
HE *next = NULL;
int recur = depth ? depth - 1 : 0;
assert(SvTYPE(ref) == SVt_PVHV);
TRACEME(("ref = 0x%x(%d)\n", ref, SvREFCNT(ref)));
hv_iterinit (self);
while ((next = hv_iternext (self)))
{
SV *key = hv_iterkeysv (next);
TRACEME(("clone item %s\n", SvPV_nolen(key) ));
_sv_string_to_bytes(key);
hv_store_ent (clone, key,
sv_clone (hv_iterval (self, next), hseen, recur), 0);
}
TRACEME(("clone = 0x%x(%d)\n", clone, SvREFCNT(clone)));
return (SV *) clone;
}
static SV *
av_clone (SV * ref, SV * target, HV* hseen, int depth)
{
AV *clone = (AV *) target;
AV *self = (AV *) ref;
SV **svp;
SV *val = NULL;
I32 arrlen = 0;
int i = 0;
int recur = depth ? depth - 1 : 0;
assert(SvTYPE(ref) == SVt_PVAV);
TRACEME(("ref = 0x%x(%d)\n", ref, SvREFCNT(ref)));
/* The following is a holdover from a very old version */
/* possible cause of memory leaks */
/* if ( (SvREFCNT(ref) > 1) ) */
/* CLONE_STORE(ref, (SV *)clone); */
arrlen = av_len (self);
av_extend (clone, arrlen);
for (i = 0; i <= arrlen; i++)
{
svp = av_fetch (self, i, 0);
if (svp)
av_store (clone, i, sv_clone (*svp, hseen, recur));
}
TRACEME(("clone = 0x%x(%d)\n", clone, SvREFCNT(clone)));
return (SV *) clone;
}
static SV *
rv_clone (SV * ref, HV* hseen, int depth)
{
SV *clone = NULL;
SV *rv = NULL;
assert(SvROK(ref));
TRACEME(("ref = 0x%x(%d)\n", ref, SvREFCNT(ref)));
if (!SvROK (ref))
return NULL;
if (sv_isobject (ref))
{
clone = newRV_noinc(sv_clone (SvRV(ref), hseen, depth));
sv_2mortal (sv_bless (clone, SvSTASH (SvRV (ref))));
}
else
clone = newRV_inc(sv_clone (SvRV(ref), hseen, depth));
TRACEME(("clone = 0x%x(%d)\n", clone, SvREFCNT(clone)));
return clone;
}
static SV *
sv_clone (SV * ref, HV* hseen, int depth)
{
SV *clone = ref;
SV **seen = NULL;
#if PERL_REVISION >= 5 && PERL_VERSION > 8
/* This is a hack for perl 5.9.*, save everything */
/* until I find out why mg_find is no longer working */
UV visible = 1;
#else
UV visible = (SvREFCNT(ref) > 1) || (SvMAGICAL(ref) && mg_find(ref, '<'));
#endif
int magic_ref = 0;
TRACEME(("ref = 0x%x(%d)\n", ref, SvREFCNT(ref)));
if (depth == 0)
return SvREFCNT_inc(ref);
if (visible && (seen = CLONE_FETCH(ref)))
{
TRACEME(("fetch ref (0x%x)\n", ref));
return SvREFCNT_inc(*seen);
}
TRACEME(("switch: (0x%x)\n", ref));
switch (SvTYPE (ref))
{
case SVt_NULL: /* 0 */
TRACEME(("sv_null\n"));
clone = newSVsv (ref);
break;
case SVt_IV: /* 1 */
TRACEME(("int scalar\n"));
case SVt_NV: /* 2 */
TRACEME(("double scalar\n"));
clone = newSVsv (ref);
break;
#if PERL_VERSION <= 10
case SVt_RV: /* 3 */
TRACEME(("ref scalar\n"));
clone = newSVsv (ref);
break;
#endif
case SVt_PV: /* 4 */
TRACEME(("string scalar\n"));
clone = newSVsv (ref);
_sv_string_to_bytes(clone);
break;
case SVt_PVIV: /* 5 */
TRACEME (("PVIV double-type\n"));
case SVt_PVNV: /* 6 */
TRACEME (("PVNV double-type\n"));
clone = newSVsv (ref);
break;
case SVt_PVMG: /* 7 */
TRACEME(("magic scalar\n"));
clone = newSVsv (ref);
break;
case SVt_PVAV: /* 10 */
TRACEME (("PVAV\n"));
clone = (SV *) newAV();
break;
case SVt_PVHV: /* 11 */
TRACEME (("PVHV\n"));
clone = (SV *) newHV();
break;
#if PERL_VERSION <= 8
case SVt_PVBM: /* 8 */
#elif PERL_VERSION >= 11
case SVt_REGEXP: /* 8 */
#endif
case SVt_PVLV: /* 9 */
case SVt_PVCV: /* 12 */
case SVt_PVGV: /* 13 */
case SVt_PVFM: /* 14 */
case SVt_PVIO: /* 15 */
TRACEME(("default: type = 0x%x\n", SvTYPE (ref)));
clone = SvREFCNT_inc(ref); /* just return the ref */
break;
default:
croak("unknown type: 0x%x", SvTYPE(ref));
}
/**
* It is *vital* that this is performed *before* recursion,
* to properly handle circular references. cb 2001-02-06
*/
if ( visible )
CLONE_STORE(ref,clone);
/*
* We'll assume (in the absence of evidence to the contrary) that A) a
* tied hash/array doesn't store its elements in the usual way (i.e.
* the mg->mg_object(s) take full responsibility for them) and B) that
* references aren't tied.
*
* If theses assumptions hold, the three options below are mutually
* exclusive.
*
* More precisely: 1 & 2 are probably mutually exclusive; 2 & 3 are
* definitely mutually exclusive; we have to test 1 before giving 2
* a chance; and we'll assume that 1 & 3 are mutually exclusive unless
* and until we can be test-cased out of our delusion.
*
* chocolateboy: 2001-05-29
*/
/* 1: TIED */
if (SvMAGICAL(ref) )
{
MAGIC* mg;
MGVTBL *vtable = 0;
for (mg = SvMAGIC(ref); mg; mg = mg->mg_moremagic)
{
SV *obj = (SV *) NULL;
/* we don't want to clone a qr (regexp) object */
/* there are probably other types as well ... */
TRACEME(("magic type: %c\n", mg->mg_type));
/* Some mg_obj's can be null, don't bother cloning */
if ( mg->mg_obj != NULL )
{
switch (mg->mg_type)
{
case 'r': /* PERL_MAGIC_qr */
obj = mg->mg_obj;
break;
case 't': /* PERL_MAGIC_taint */
continue;
break;
case '<': /* PERL_MAGIC_backref */
continue;
break;
case '@': /* PERL_MAGIC_arylen_p */
continue;
break;
case 'P': /* PERL_MAGIC_tied */
case 'p': /* PERL_MAGIC_tiedelem */
case 'q': /* PERL_MAGIC_tiedscalar */
magic_ref++;
/* fall through */
default:
obj = sv_clone(mg->mg_obj, hseen, -1);
}
} else {
TRACEME(("magic object for type %c in NULL\n", mg->mg_type));
}
/* this is plain old magic, so do the same thing */
sv_magic(clone,
obj,
mg->mg_type,
mg->mg_ptr,
mg->mg_len);
}
/* major kludge - why does the vtable for a qr type need to be null? */
if (( mg = mg_find(clone, 'r') ))
mg->mg_virtual = (MGVTBL *) NULL;
}
/* 2: HASH/ARRAY - (with 'internal' elements) */
if ( magic_ref )
{
;;
}
else if ( SvTYPE(ref) == SVt_PVHV )
clone = hv_clone (ref, clone, hseen, depth);
else if ( SvTYPE(ref) == SVt_PVAV )
clone = av_clone (ref, clone, hseen, depth);
/* 3: REFERENCE (inlined for speed) */
else if (SvROK (ref))
{
TRACEME(("clone = 0x%x(%d)\n", clone, SvREFCNT(clone)));
SvREFCNT_dec(SvRV(clone));
SvRV(clone) = sv_clone (SvRV(ref), hseen, depth); /* Clone the referent */
if (sv_isobject (ref))
{
sv_bless (clone, SvSTASH (SvRV (ref)));
}
if (SvWEAKREF(ref)) {
sv_rvweaken(clone);
}
}
TRACEME(("clone = 0x%x(%d)\n", clone, SvREFCNT(clone)));
return clone;
}
MODULE = Clone::AsUTF8Bytes PACKAGE = Clone::AsUTF8Bytes
PROTOTYPES: ENABLE
void
clone_as_utf8_bytes(self, depth=-1)
SV *self
int depth
PREINIT:
SV *clone = &PL_sv_undef;
HV *hseen = newHV();
PPCODE:
TRACEME(("ref = 0x%x\n", self));
clone = sv_clone(self, hseen, depth);
hv_clear(hseen); /* Free HV */
SvREFCNT_dec((SV *)hseen);
EXTEND(SP,1);
PUSHs(sv_2mortal(clone));
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