/* pad.h
*
- * Copyright (c) 2002, Larry Wall
+ * Copyright (C) 2002, 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 */
/* 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 */
+
+#ifdef DEBUGGING
+# define ASSERT_CURPAD_LEGAL(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) \
+ 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')
=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
Set the current pad to be pad C<n> in the padlist, saving
the previous current pad.
+=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
*/
? AvARRAY((AV*)(AvARRAY(padlist)[1]))[po] : Nullsv;
+#define PAD_SET_CUR_NOSAVE(padlist,n) \
+ PL_comppad = (PAD*) (AvARRAY(padlist)[n]); \
+ 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)(n)));
+
+
#define PAD_SET_CUR(padlist,n) \
- SAVEVPTR(PL_curpad); \
- PL_curpad = AvARRAY((AV*)*av_fetch((padlist),(n),FALSE))
+ SAVECOMPPAD(); \
+ PAD_SET_CUR_NOSAVE(padlist,n);
+
+
+#define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
+ PL_comppad = Null(PAD*); PL_curpad = Null(SV**); \
+ 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(SV**); \
+ 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(SV**); \
+ 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])
/*
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_PV(po) SvPV_nolen(*av_fetch(PL_comppad_name, (po), FALSE))
-/* 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])
-
+#define PAD_COMPNAME_GEN_set(po, gen) SvCUR_set(AvARRAY(PL_comppad_name)[po], 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(SV**); \
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; \
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