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- /* pad.h
- *
- * 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.
- *
- * 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 */
-
- #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 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|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.
-
- =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] : 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) \
- 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_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_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|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.
-
- =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_OURSTASH(po) \
- (GvSTASH(*av_fetch(PL_comppad_name, (po), FALSE)))
-
- #define PAD_COMPNAME_GEN(po) SvCUR(AvARRAY(PL_comppad_name)[po])
-
-
-
-
- /*
- =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 = ptr_table_fetch(PL_ptr_table, proto_perl->Tcomppad); \
- 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_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;
-