[p5sagit/p5-mst-13.2.git] / pad.h

/*    pad.h
 *
 *    Copyright (C) 2002, 2003, 2005, 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.
 *
 * This file defines the types and macros associated with the API for
 * manipulating scratchpads, which are used by perl to store lexical
 * variables, op targets and constants.
 */


/* a padlist is currently just an AV; but that might change,
 * so hide the type. Ditto a pad.  */

typedef AV PADLIST;
typedef AV PAD;


/* offsets within a pad */

#if PTRSIZE == 4
typedef U32TYPE PADOFFSET;
#else
#   if PTRSIZE == 8
typedef U64TYPE PADOFFSET;
#   endif
#endif
#define NOT_IN_PAD ((PADOFFSET) -1)
 

/* flags for the pad_new() function */

#define padnew_CLONE	1	/* this pad is for a cloned CV */
#define padnew_SAVE	2	/* save old globals */
#define padnew_SAVESUB	4	/* also save extra stuff for start of sub */

/* values for the pad_tidy() function */

typedef enum {
	padtidy_SUB,		/* tidy up a pad for a sub, */
	padtidy_SUBCLONE,	/* a cloned sub, */
	padtidy_FORMAT		/* or a format */
} padtidy_type;

/* ASSERT_CURPAD_LEGAL and ASSERT_CURPAD_ACTIVE respectively determine
 * whether PL_comppad and PL_curpad are consistent and whether they have
 * active values */

#ifndef PERL_MAD
#  define pad_peg(label)
#endif

#ifdef DEBUGGING
#  define ASSERT_CURPAD_LEGAL(label) \
    pad_peg(label); \
    if (PL_comppad ? (AvARRAY(PL_comppad) != PL_curpad) : (PL_curpad != 0))  \
	Perl_croak(aTHX_ "panic: illegal pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
	    label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));


#  define ASSERT_CURPAD_ACTIVE(label) \
    pad_peg(label); \
    if (!PL_comppad || (AvARRAY(PL_comppad) != PL_curpad))		  \
	Perl_croak(aTHX_ "panic: invalid pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
	    label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
#else
#  define ASSERT_CURPAD_LEGAL(label)
#  define ASSERT_CURPAD_ACTIVE(label)
#endif


/* Note: the following three macros are actually defined in scope.h, but
 * they are documented here for completeness, since they directly or
 * indirectly affect pads.

=for apidoc m|void|SAVEPADSV	|PADOFFSET po
Save a pad slot (used to restore after an iteration)

XXX DAPM it would make more sense to make the arg a PADOFFSET
=for apidoc m|void|SAVECLEARSV	|SV **svp
Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')

=for apidoc m|void|SAVECOMPPAD
save PL_comppad and PL_curpad


=for apidoc m|SV *|PAD_SETSV	|PADOFFSET po|SV* sv
Set the slot at offset C<po> in the current pad to C<sv>

=for apidoc m|void|PAD_SV	|PADOFFSET po
Get the value at offset C<po> in the current pad

=for apidoc m|SV *|PAD_SVl	|PADOFFSET po
Lightweight and lvalue version of C<PAD_SV>.
Get or set the value at offset C<po> in the current pad.
Unlike C<PAD_SV>, does not print diagnostics with -DX.
For internal use only.

=for apidoc m|SV *|PAD_BASE_SV	|PADLIST padlist|PADOFFSET po
Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist

=for apidoc m|void|PAD_SET_CUR	|PADLIST padlist|I32 n
Set the current pad to be pad C<n> in the padlist, saving
the previous current pad. NB currently this macro expands to a string too
long for some compilers, so it's best to replace it with

    SAVECOMPPAD();
    PAD_SET_CUR_NOSAVE(padlist,n);


=for apidoc m|void|PAD_SET_CUR_NOSAVE	|PADLIST padlist|I32 n
like PAD_SET_CUR, but without the save

=for apidoc m|void|PAD_SAVE_SETNULLPAD
Save the current pad then set it to null.

=for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad
Save the current pad to the local variable opad, then make the
current pad equal to npad

=for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad
Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()

=cut
*/

#ifdef DEBUGGING
#  define PAD_SV(po)	   pad_sv(po)
#  define PAD_SETSV(po,sv) pad_setsv(po,sv)
#else
#  define PAD_SV(po)       (PL_curpad[po])
#  define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
#endif

#define PAD_SVl(po)       (PL_curpad[po])

#define PAD_BASE_SV(padlist, po) \
	(AvARRAY(padlist)[1]) 	\
	    ? AvARRAY((AV*)(AvARRAY(padlist)[1]))[po] : NULL;
    

#define PAD_SET_CUR_NOSAVE(padlist,nth) \
	PL_comppad = (PAD*) (AvARRAY(padlist)[nth]);		\
	PL_curpad = AvARRAY(PL_comppad);			\
	DEBUG_Xv(PerlIO_printf(Perl_debug_log,			\
	      "Pad 0x%"UVxf"[0x%"UVxf"] set_cur    depth=%d\n",	\
	      PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));


#define PAD_SET_CUR(padlist,nth) \
	SAVECOMPPAD();						\
	PAD_SET_CUR_NOSAVE(padlist,nth);


#define PAD_SAVE_SETNULLPAD()	SAVECOMPPAD(); \
	PL_comppad = NULL; PL_curpad = NULL;	\
	DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));

#define PAD_SAVE_LOCAL(opad,npad) \
	opad = PL_comppad;					\
	PL_comppad = (npad);					\
	PL_curpad =  PL_comppad ? AvARRAY(PL_comppad) : NULL;	\
	DEBUG_Xv(PerlIO_printf(Perl_debug_log,			\
	      "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n",		\
	      PTR2UV(PL_comppad), PTR2UV(PL_curpad)));

#define PAD_RESTORE_LOCAL(opad) \
	PL_comppad = opad;					\
	PL_curpad =  PL_comppad ? AvARRAY(PL_comppad) : NULL;	\
	DEBUG_Xv(PerlIO_printf(Perl_debug_log,			\
	      "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n",	\
	      PTR2UV(PL_comppad), PTR2UV(PL_curpad)));


/*
=for apidoc m|void|CX_CURPAD_SAVE|struct context
Save the current pad in the given context block structure.

=for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po
Access the SV at offset po in the saved current pad in the given
context block structure (can be used as an lvalue).

=cut
*/

#define CX_CURPAD_SAVE(block)  (block).oldcomppad = PL_comppad
#define CX_CURPAD_SV(block,po) (AvARRAY((AV*)((block).oldcomppad))[po])


/*
=for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po
Return the flags for the current compiling pad name
at offset C<po>. Assumes a valid slot entry.

=for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po
Return the name of the current compiling pad name
at offset C<po>. Assumes a valid slot entry.

=for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po
Return the type (stash) of the current compiling pad name at offset
C<po>. Must be a valid name. Returns null if not typed.

=for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po
Return the stash associated with an C<our> variable.
Assumes the slot entry is a valid C<our> lexical.

=for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po
The generation number of the name at offset C<po> in the current
compiling pad (lvalue). Note that C<SvCUR> is hijacked for this purpose.

=for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen
Sets the generation number of the name at offset C<po> in the current
ling pad (lvalue) to C<gen>.  Note that C<SvCUR_set> is hijacked for this purpose.

=cut

*/

#define PAD_COMPNAME_FLAGS(po) SvFLAGS(*av_fetch(PL_comppad_name, (po), FALSE))
#define PAD_COMPNAME_FLAGS_isOUR(po) \
  ((PAD_COMPNAME_FLAGS(po) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
#define PAD_COMPNAME_PV(po) SvPV_nolen(*av_fetch(PL_comppad_name, (po), FALSE))

#define PAD_COMPNAME_TYPE(po) pad_compname_type(po)

#define PAD_COMPNAME_OURSTASH(po) \
    (OURSTASH(*av_fetch(PL_comppad_name, (po), FALSE)))

#define PAD_COMPNAME_GEN(po) SvCUR(AvARRAY(PL_comppad_name)[po])

#define PAD_COMPNAME_GEN_set(po, gen) SvCUR_set(AvARRAY(PL_comppad_name)[po], gen)


/*
=for apidoc m|void|PAD_DUP|PADLIST dstpad|PADLIST srcpad|CLONE_PARAMS* param
Clone a padlist.

=for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl \
|CLONE_PARAMS* param
Clone the state variables associated with running and compiling pads.

=cut
*/


#define PAD_DUP(dstpad, srcpad, param)				\
    if ((srcpad) && !AvREAL(srcpad)) {				\
	/* XXX padlists are real, but pretend to be not */ 	\
	AvREAL_on(srcpad);					\
	(dstpad) = av_dup_inc((srcpad), param);			\
	AvREAL_off(srcpad);					\
	AvREAL_off(dstpad);					\
    }								\
    else							\
	(dstpad) = av_dup_inc((srcpad), param);			

/* NB - we set PL_comppad to null unless it points at a value that
 * has already been dup'ed, ie it points to part of an active padlist.
 * Otherwise PL_comppad ends up being a leaked scalar in code like
 * the following:
 *     threads->create(sub { threads->create(sub {...} ) } );
 * where the second thread dups the outer sub's comppad but not the
 * sub's CV or padlist. */

#define PAD_CLONE_VARS(proto_perl, param)				\
    PL_comppad = (AV *) ptr_table_fetch(PL_ptr_table, proto_perl->Icomppad); \
    PL_curpad = PL_comppad ?  AvARRAY(PL_comppad) : NULL;		\
    PL_comppad_name		= av_dup(proto_perl->Icomppad_name, param); \
    PL_comppad_name_fill	= proto_perl->Icomppad_name_fill;	\
    PL_comppad_name_floor	= proto_perl->Icomppad_name_floor;	\
    PL_min_intro_pending	= proto_perl->Imin_intro_pending;	\
    PL_max_intro_pending	= proto_perl->Imax_intro_pending;	\
    PL_padix			= proto_perl->Ipadix;			\
    PL_padix_floor		= proto_perl->Ipadix_floor;		\
    PL_pad_reset_pending	= proto_perl->Ipad_reset_pending;	\
    PL_cop_seqmax		= proto_perl->Icop_seqmax;
Commit	Line	Data
dd2155a4	1	/* pad.h
dd2155a4	2	*
45ca242c	3	* Copyright (C) 2002, 2003, 2005, by Larry Wall and others
dd2155a4	4	*
	5	* You may distribute under the terms of either the GNU General Public
	6	* License or the Artistic License, as specified in the README file.
	7	*
	8	* This file defines the types and macros associated with the API for
	9	* manipulating scratchpads, which are used by perl to store lexical
	10	* variables, op targets and constants.
	11	*/
	12
	13
	14
	15
	16	/* a padlist is currently just an AV; but that might change,
	17	* so hide the type. Ditto a pad. */
	18
	19	typedef AV PADLIST;
f3548bdc	20	typedef AV PAD;
dd2155a4	21
	22
	23	/* offsets within a pad */
	24
	25	#if PTRSIZE == 4
	26	typedef U32TYPE PADOFFSET;
	27	#else
	28	# if PTRSIZE == 8
	29	typedef U64TYPE PADOFFSET;
	30	# endif
	31	#endif
	32	#define NOT_IN_PAD ((PADOFFSET) -1)
	33
	34
	35	/* flags for the pad_new() function */
	36
c7c737cb	37	#define padnew_CLONE 1 /* this pad is for a cloned CV */
	38	#define padnew_SAVE 2 /* save old globals */
	39	#define padnew_SAVESUB 4 /* also save extra stuff for start of sub */
dd2155a4	40
	41	/* values for the pad_tidy() function */
	42
	43	typedef enum {
	44	padtidy_SUB, /* tidy up a pad for a sub, */
	45	padtidy_SUBCLONE, /* a cloned sub, */
	46	padtidy_FORMAT /* or a format */
	47	} padtidy_type;
	48
f3548bdc	49	/* ASSERT_CURPAD_LEGAL and ASSERT_CURPAD_ACTIVE respectively determine
	50	* whether PL_comppad and PL_curpad are consistent and whether they have
	51	* active values */
dd2155a4	52
1dba731d	53	#ifndef PERL_MAD
	54	# define pad_peg(label)
	55	#endif
	56
f3548bdc	57	#ifdef DEBUGGING
f3548bdc	58	# define ASSERT_CURPAD_LEGAL(label) \
1dba731d	59	pad_peg(label); \
f3548bdc	60	if (PL_comppad ? (AvARRAY(PL_comppad) != PL_curpad) : (PL_curpad != 0)) \
	61	Perl_croak(aTHX_ "panic: illegal pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
	62	label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
	63
	64
	65	# define ASSERT_CURPAD_ACTIVE(label) \
1dba731d	66	pad_peg(label); \
f3548bdc	67	if (!PL_comppad \|\| (AvARRAY(PL_comppad) != PL_curpad)) \
	68	Perl_croak(aTHX_ "panic: invalid pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
	69	label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
	70	#else
	71	# define ASSERT_CURPAD_LEGAL(label)
	72	# define ASSERT_CURPAD_ACTIVE(label)
	73	#endif
	74
	75
	76
	77	/* Note: the following three macros are actually defined in scope.h, but
dd2155a4	78	* they are documented here for completeness, since they directly or
	79	* indirectly affect pads.
	80
	81	=for apidoc m\|void\|SAVEPADSV \|PADOFFSET po
	82	Save a pad slot (used to restore after an iteration)
	83
f3548bdc	84	XXX DAPM it would make more sense to make the arg a PADOFFSET
dd2155a4	85	=for apidoc m\|void\|SAVECLEARSV \|SV **svp
eeb8d49e	86	Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')
dd2155a4	87
	88	=for apidoc m\|void\|SAVECOMPPAD
	89	save PL_comppad and PL_curpad
	90
dd2155a4	91
	92
	93
	94
	95	=for apidoc m\|SV \|PAD_SETSV \|PADOFFSET po\|SV sv
	96	Set the slot at offset C<po> in the current pad to C<sv>
	97
	98	=for apidoc m\|void\|PAD_SV \|PADOFFSET po
	99	Get the value at offset C<po> in the current pad
	100
	101	=for apidoc m\|SV *\|PAD_SVl \|PADOFFSET po
	102	Lightweight and lvalue version of C<PAD_SV>.
	103	Get or set the value at offset C<po> in the current pad.
	104	Unlike C<PAD_SV>, does not print diagnostics with -DX.
	105	For internal use only.
	106
	107	=for apidoc m\|SV *\|PAD_BASE_SV \|PADLIST padlist\|PADOFFSET po
	108	Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
	109
	110	=for apidoc m\|void\|PAD_SET_CUR \|PADLIST padlist\|I32 n
	111	Set the current pad to be pad C<n> in the padlist, saving
fd617465	112	the previous current pad. NB currently this macro expands to a string too
	113	long for some compilers, so it's best to replace it with
	114
	115	SAVECOMPPAD();
	116	PAD_SET_CUR_NOSAVE(padlist,n);
	117
dd2155a4	118
4e380990	119	=for apidoc m\|void\|PAD_SET_CUR_NOSAVE \|PADLIST padlist\|I32 n
	120	like PAD_SET_CUR, but without the save
	121
dd2155a4	122	=for apidoc m\|void\|PAD_SAVE_SETNULLPAD
	123	Save the current pad then set it to null.
	124
f3548bdc	125	=for apidoc m\|void\|PAD_SAVE_LOCAL\|PAD opad\|PAD npad
	126	Save the current pad to the local variable opad, then make the
	127	current pad equal to npad
	128
	129	=for apidoc m\|void\|PAD_RESTORE_LOCAL\|PAD *opad
	130	Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
dd2155a4	131
	132	=cut
	133	*/
	134
	135	#ifdef DEBUGGING
	136	# define PAD_SV(po) pad_sv(po)
	137	# define PAD_SETSV(po,sv) pad_setsv(po,sv)
	138	#else
	139	# define PAD_SV(po) (PL_curpad[po])
	140	# define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
	141	#endif
	142
	143	#define PAD_SVl(po) (PL_curpad[po])
	144
	145	#define PAD_BASE_SV(padlist, po) \
	146	(AvARRAY(padlist)[1]) \
a0714e2c	147	? AvARRAY((AV*)(AvARRAY(padlist)[1]))[po] : NULL;
dd2155a4	148
dd2155a4	149
de5e01c2	150	#define PAD_SET_CUR_NOSAVE(padlist,nth) \
de5e01c2	151	PL_comppad = (PAD*) (AvARRAY(padlist)[nth]); \
f3548bdc	152	PL_curpad = AvARRAY(PL_comppad); \
	153	DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
	154	"Pad 0x%"UVxf"[0x%"UVxf"] set_cur depth=%d\n", \
de5e01c2	155	PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));
f3548bdc	156
f3548bdc	157
de5e01c2	158	#define PAD_SET_CUR(padlist,nth) \
4e380990	159	SAVECOMPPAD(); \
de5e01c2	160	PAD_SET_CUR_NOSAVE(padlist,nth);
4e380990	161
4e380990	162
f3548bdc	163	#define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
4608196e	164	PL_comppad = NULL; PL_curpad = NULL; \
f3548bdc	165	DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
	166
	167	#define PAD_SAVE_LOCAL(opad,npad) \
	168	opad = PL_comppad; \
	169	PL_comppad = (npad); \
4608196e	170	PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
f3548bdc	171	DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
	172	"Pad 0x%"UVxf"[0x%"UVxf"] save_local\n", \
	173	PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
	174
	175	#define PAD_RESTORE_LOCAL(opad) \
	176	PL_comppad = opad; \
4608196e	177	PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
f3548bdc	178	DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
	179	"Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n", \
	180	PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
dd2155a4	181
	182
	183	/*
	184	=for apidoc m\|void\|CX_CURPAD_SAVE\|struct context
	185	Save the current pad in the given context block structure.
	186
f3548bdc	187	=for apidoc m\|SV *\|CX_CURPAD_SV\|struct context\|PADOFFSET po
dd2155a4	188	Access the SV at offset po in the saved current pad in the given
	189	context block structure (can be used as an lvalue).
	190
	191	=cut
	192	*/
	193
f3548bdc	194	#define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
f3548bdc	195	#define CX_CURPAD_SV(block,po) (AvARRAY((AV*)((block).oldcomppad))[po])
dd2155a4	196
	197
	198	/*
	199	=for apidoc m\|U32\|PAD_COMPNAME_FLAGS\|PADOFFSET po
	200	Return the flags for the current compiling pad name
	201	at offset C<po>. Assumes a valid slot entry.
	202
	203	=for apidoc m\|char *\|PAD_COMPNAME_PV\|PADOFFSET po
	204	Return the name of the current compiling pad name
	205	at offset C<po>. Assumes a valid slot entry.
	206
	207	=for apidoc m\|HV *\|PAD_COMPNAME_TYPE\|PADOFFSET po
	208	Return the type (stash) of the current compiling pad name at offset
	209	C<po>. Must be a valid name. Returns null if not typed.
	210
	211	=for apidoc m\|HV *\|PAD_COMPNAME_OURSTASH\|PADOFFSET po
	212	Return the stash associated with an C<our> variable.
	213	Assumes the slot entry is a valid C<our> lexical.
	214
	215	=for apidoc m\|STRLEN\|PAD_COMPNAME_GEN\|PADOFFSET po
	216	The generation number of the name at offset C<po> in the current
	217	compiling pad (lvalue). Note that C<SvCUR> is hijacked for this purpose.
	218
b162af07	219	=for apidoc m\|STRLEN\|PAD_COMPNAME_GEN_set\|PADOFFSET po\|int gen
	220	Sets the generation number of the name at offset C<po> in the current
	221	ling pad (lvalue) to C<gen>. Note that C<SvCUR_set> is hijacked for this purpose.
	222
dd2155a4	223	=cut
b162af07	224
dd2155a4	225	*/
	226
	227	#define PAD_COMPNAME_FLAGS(po) SvFLAGS(*av_fetch(PL_comppad_name, (po), FALSE))
1e7f542f	228	#define PAD_COMPNAME_FLAGS_isOUR(po) \
1e7f542f	229	((PAD_COMPNAME_FLAGS(po) & (SVpad_NAME\|SVpad_OUR)) == (SVpad_NAME\|SVpad_OUR))
dd2155a4	230	#define PAD_COMPNAME_PV(po) SvPV_nolen(*av_fetch(PL_comppad_name, (po), FALSE))
dd2155a4	231
b21dc031	232	#define PAD_COMPNAME_TYPE(po) pad_compname_type(po)
dd2155a4	233
dd2155a4	234	#define PAD_COMPNAME_OURSTASH(po) \
035dab74	235	(OURSTASH(*av_fetch(PL_comppad_name, (po), FALSE)))
dd2155a4	236
	237	#define PAD_COMPNAME_GEN(po) SvCUR(AvARRAY(PL_comppad_name)[po])
	238
b162af07	239	#define PAD_COMPNAME_GEN_set(po, gen) SvCUR_set(AvARRAY(PL_comppad_name)[po], gen)
dd2155a4	240
	241
	242	/*
	243	=for apidoc m\|void\|PAD_DUP\|PADLIST dstpad\|PADLIST srcpad\|CLONE_PARAMS* param
	244	Clone a padlist.
	245
	246	=for apidoc m\|void\|PAD_CLONE_VARS\|PerlInterpreter *proto_perl \
	247	\|CLONE_PARAMS* param
	248	Clone the state variables associated with running and compiling pads.
	249
	250	=cut
	251	*/
	252
	253
	254	#define PAD_DUP(dstpad, srcpad, param) \
	255	if ((srcpad) && !AvREAL(srcpad)) { \
	256	/* XXX padlists are real, but pretend to be not */ \
	257	AvREAL_on(srcpad); \
	258	(dstpad) = av_dup_inc((srcpad), param); \
	259	AvREAL_off(srcpad); \
	260	AvREAL_off(dstpad); \
	261	} \
	262	else \
	263	(dstpad) = av_dup_inc((srcpad), param);
	264
c5ab0850	265	/* NB - we set PL_comppad to null unless it points at a value that
	266	* has already been dup'ed, ie it points to part of an active padlist.
	267	* Otherwise PL_comppad ends up being a leaked scalar in code like
	268	* the following:
	269	* threads->create(sub { threads->create(sub {...} ) } );
	270	* where the second thread dups the outer sub's comppad but not the
	271	* sub's CV or padlist. */
f3548bdc	272
dd2155a4	273	#define PAD_CLONE_VARS(proto_perl, param) \
8f77bfdb	274	PL_comppad = (AV *) ptr_table_fetch(PL_ptr_table, proto_perl->Icomppad); \
4608196e	275	PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
dd2155a4	276	PL_comppad_name = av_dup(proto_perl->Icomppad_name, param); \
	277	PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \
	278	PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \
dd2155a4	279	PL_min_intro_pending = proto_perl->Imin_intro_pending; \
	280	PL_max_intro_pending = proto_perl->Imax_intro_pending; \
	281	PL_padix = proto_perl->Ipadix; \
	282	PL_padix_floor = proto_perl->Ipadix_floor; \
	283	PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \
	284	PL_cop_seqmax = proto_perl->Icop_seqmax;