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pad.h
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pad.h
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/* 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;