/* pad.h
*
- * Copyright (c) 2002, Larry Wall
+ * Copyright (C) 2002, 2003, 2005, 2006, 2007 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.
* so hide the type. Ditto a pad. */
typedef AV PADLIST;
-typedef SV** PAD;
+typedef AV PAD;
/* offsets within a pad */
# endif
#endif
#define NOT_IN_PAD ((PADOFFSET) -1)
-
+
+/* B.xs needs these for the benefit of B::Deparse */
+/* Low range end is exclusive (valid from the cop seq after this one) */
+/* High range end is inclusive (valid up to this cop seq) */
+
+#if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
+# define COP_SEQ_RANGE_LOW(sv) \
+ (({ SV *const _svi = (SV *) (sv); \
+ assert(SvTYPE(_svi) == SVt_NV || SvTYPE(_svi) >= SVt_PVNV); \
+ assert(SvTYPE(_svi) != SVt_PVAV); \
+ assert(SvTYPE(_svi) != SVt_PVHV); \
+ assert(SvTYPE(_svi) != SVt_PVCV); \
+ assert(SvTYPE(_svi) != SVt_PVFM); \
+ assert(!isGV_with_GP(_svi)); \
+ ((XPVNV*) SvANY(_svi))->xnv_u.xpad_cop_seq.xlow; \
+ }))
+# define COP_SEQ_RANGE_HIGH(sv) \
+ (({ SV *const _svi = (SV *) (sv); \
+ assert(SvTYPE(_svi) == SVt_NV || SvTYPE(_svi) >= SVt_PVNV); \
+ assert(SvTYPE(_svi) != SVt_PVAV); \
+ assert(SvTYPE(_svi) != SVt_PVHV); \
+ assert(SvTYPE(_svi) != SVt_PVCV); \
+ assert(SvTYPE(_svi) != SVt_PVFM); \
+ assert(!isGV_with_GP(_svi)); \
+ ((XPVNV*) SvANY(_svi))->xnv_u.xpad_cop_seq.xhigh; \
+ }))
+# define PARENT_PAD_INDEX(sv) \
+ (({ SV *const _svi = (SV *) (sv); \
+ assert(SvTYPE(_svi) == SVt_NV || SvTYPE(_svi) >= SVt_PVNV); \
+ assert(SvTYPE(_svi) != SVt_PVAV); \
+ assert(SvTYPE(_svi) != SVt_PVHV); \
+ assert(SvTYPE(_svi) != SVt_PVCV); \
+ assert(SvTYPE(_svi) != SVt_PVFM); \
+ assert(!isGV_with_GP(_svi)); \
+ ((XPVNV*) SvANY(_svi))->xnv_u.xpad_cop_seq.xlow; \
+ }))
+# define PARENT_FAKELEX_FLAGS(sv) \
+ (({ SV *const _svi = (SV *) (sv); \
+ assert(SvTYPE(_svi) == SVt_NV || SvTYPE(_svi) >= SVt_PVNV); \
+ assert(SvTYPE(_svi) != SVt_PVAV); \
+ assert(SvTYPE(_svi) != SVt_PVHV); \
+ assert(SvTYPE(_svi) != SVt_PVCV); \
+ assert(SvTYPE(_svi) != SVt_PVFM); \
+ assert(!isGV_with_GP(_svi)); \
+ ((XPVNV*) SvANY(_svi))->xnv_u.xpad_cop_seq.xhigh; \
+ }))
+#else
+# define COP_SEQ_RANGE_LOW(sv) \
+ (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
+# define COP_SEQ_RANGE_HIGH(sv) \
+ (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
+
+
+# define PARENT_PAD_INDEX(sv) \
+ (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
+# define PARENT_FAKELEX_FLAGS(sv) \
+ (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
+#endif
+
+/* Flags set in the SvIVX field of FAKE namesvs */
+
+#define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
+#define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
/* flags for the pad_new() function */
-typedef enum {
- padnew_CLONE = 1, /* this pad is for a cloned CV */
- padnew_SAVE = 2, /* save old globals */
- padnew_SAVESUB = 4 /* also save extra stuff for start of sub */
-} padnew_flags;
+#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 */
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 four macros are actually defined in scope.h, but
+/* 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. (ie the runtime action of 'my')
+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|void|SAVEFREEOP |OP *o
-Free the op on scope exit. At the same time, reset PL_curpad
=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.
+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_UPDATE_CURPAD
-Set PL_curpad from the value of PL_comppad.
+=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
*/
#define PAD_BASE_SV(padlist, po) \
(AvARRAY(padlist)[1]) \
- ? AvARRAY((AV*)(AvARRAY(padlist)[1]))[po] : Nullsv;
+ ? AvARRAY((AV*)(AvARRAY(padlist)[1]))[po] : NULL;
-#define PAD_SET_CUR(padlist,n) \
- SAVEVPTR(PL_curpad); \
- PL_curpad = AvARRAY((AV*)*av_fetch((padlist),(n),FALSE))
+#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_SETNULLPAD SAVEVPTR(PL_curpad); PL_curpad = 0;
+#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_UPDATE_CURPAD \
- PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : Null(PAD)
+#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|PAD *|CX_CURPAD_SV|struct context|PADOFFSET po
+=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).oldcurpad = PL_curpad
-#define CX_CURPAD_SV(block,po) ((block).oldcurpad[po])
+#define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
+#define CX_CURPAD_SV(block,po) (AvARRAY((AV*)((block).oldcomppad))[po])
/*
=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.
+compiling pad (lvalue). Note that C<SvUVX> 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<SvUV_set> is hijacked for this purpose.
=cut
+
*/
-#define PAD_COMPNAME_FLAGS(po) SvFLAGS(*av_fetch(PL_comppad_name, (po), FALSE))
-#define PAD_COMPNAME_PV(po) SvPV_nolen(*av_fetch(PL_comppad_name, (po), FALSE))
+#define PAD_COMPNAME_SV(po) (*av_fetch(PL_comppad_name, (po), FALSE))
+#define PAD_COMPNAME_FLAGS(po) SvFLAGS(PAD_COMPNAME_SV(po))
+#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(PAD_COMPNAME_SV(po))
-/* XXX DAPM yuk - using av_fetch twice. Is there a better way? */
-#define PAD_COMPNAME_TYPE(po) \
- ((SvFLAGS(*av_fetch(PL_comppad_name, (po), FALSE)) & SVpad_TYPED) \
- ? (SvSTASH(*av_fetch(PL_comppad_name, (po), FALSE))) : Nullhv)
+#define PAD_COMPNAME_TYPE(po) pad_compname_type(po)
#define PAD_COMPNAME_OURSTASH(po) \
- (GvSTASH(*av_fetch(PL_comppad_name, (po), FALSE)))
-
-#define PAD_COMPNAME_GEN(po) SvCUR(AvARRAY(PL_comppad_name)[po])
+ (SvOURSTASH(PAD_COMPNAME_SV(po)))
+#define PAD_COMPNAME_GEN(po) ((STRLEN)SvUVX(AvARRAY(PL_comppad_name)[po]))
+#define PAD_COMPNAME_GEN_set(po, gen) SvUV_set(AvARRAY(PL_comppad_name)[po], (UV)(gen))
/*
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_dup(proto_perl->Icomppad, 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_curpad = (SV**)ptr_table_fetch(PL_ptr_table, \
- proto_perl->Tcurpad); \
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;
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */