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/* pad.h * * Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008, * 2009, 2010, 2011 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. */ /* =head1 Pad Data Structures */ /* 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) /* a value that PL_cop_seqmax is guaranteed never to be, * flagging that a lexical is being introduced, or has not yet left scope */ #define PERL_PADSEQ_INTRO U32_MAX /* 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) \ (({ const SV *const _sv_cop_seq_range_low = (const SV *) (sv); \ assert(SvTYPE(_sv_cop_seq_range_low) == SVt_NV \ || SvTYPE(_sv_cop_seq_range_low) >= SVt_PVNV); \ assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVAV); \ assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVHV); \ assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVCV); \ assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVFM); \ assert(!isGV_with_GP(_sv_cop_seq_range_low)); \ ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_low)))->xnv_u.xpad_cop_seq.xlow; \ })) # define COP_SEQ_RANGE_HIGH(sv) \ (({ const SV *const _sv_cop_seq_range_high = (const SV *) (sv); \ assert(SvTYPE(_sv_cop_seq_range_high) == SVt_NV \ || SvTYPE(_sv_cop_seq_range_high) >= SVt_PVNV); \ assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVAV); \ assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVHV); \ assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVCV); \ assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVFM); \ assert(!isGV_with_GP(_sv_cop_seq_range_high)); \ ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_high)))->xnv_u.xpad_cop_seq.xhigh; \ })) # define PARENT_PAD_INDEX(sv) \ (({ const SV *const _sv_parent_pad_index = (const SV *) (sv); \ assert(SvTYPE(_sv_parent_pad_index) == SVt_NV \ || SvTYPE(_sv_parent_pad_index) >= SVt_PVNV); \ assert(SvTYPE(_sv_parent_pad_index) != SVt_PVAV); \ assert(SvTYPE(_sv_parent_pad_index) != SVt_PVHV); \ assert(SvTYPE(_sv_parent_pad_index) != SVt_PVCV); \ assert(SvTYPE(_sv_parent_pad_index) != SVt_PVFM); \ assert(!isGV_with_GP(_sv_parent_pad_index)); \ ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_pad_index)))->xnv_u.xpad_cop_seq.xlow; \ })) # define PARENT_FAKELEX_FLAGS(sv) \ (({ const SV *const _sv_parent_fakelex_flags = (const SV *) (sv); \ assert(SvTYPE(_sv_parent_fakelex_flags) == SVt_NV \ || SvTYPE(_sv_parent_fakelex_flags) >= SVt_PVNV); \ assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVAV); \ assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVHV); \ assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVCV); \ assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVFM); \ assert(!isGV_with_GP(_sv_parent_fakelex_flags)); \ ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_fakelex_flags)))->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 */ #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; /* flags for pad_add_name_pvn. */ #define padadd_OUR 0x01 /* our declaration. */ #define padadd_STATE 0x02 /* state declaration. */ #define padadd_NO_DUP_CHECK 0x04 /* skip warning on dups. */ #define padadd_UTF8_NAME SVf_UTF8 /* name is UTF-8 encoded. */ /* 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(MUTABLE_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) \ assert(!opad || !SvIS_FREED(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(MUTABLE_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<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_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) SvPAD_OUR(PAD_COMPNAME_SV(po)) #define PAD_COMPNAME_PV(po) SvPV_nolen(PAD_COMPNAME_SV(po)) #define PAD_COMPNAME_TYPE(po) pad_compname_type(po) #define PAD_COMPNAME_OURSTASH(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)) /* =for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl|CLONE_PARAMS* param Clone the state variables associated with running and compiling pads. =cut */ /* 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_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; /* =for apidoc Am|PADOFFSET|pad_add_name_pvs|const char *name|U32 flags|HV *typestash|HV *ourstash Exactly like L</pad_add_name_pvn>, but takes a literal string instead of a string/length pair. =cut */ #define pad_add_name_pvs(name,flags,typestash,ourstash) \ Perl_pad_add_name_pvn(aTHX_ STR_WITH_LEN(name), flags, typestash, ourstash) /* =for apidoc Am|PADOFFSET|pad_findmy_pvs|const char *name|U32 flags Exactly like L</pad_findmy_pvn>, but takes a literal string instead of a string/length pair. =cut */ #define pad_findmy_pvs(name,flags) \ Perl_pad_findmy_pvn(aTHX_ STR_WITH_LEN(name), flags) /* * Local variables: * c-indentation-style: bsd * c-basic-offset: 4 * indent-tabs-mode: t * End: * * ex: set ts=8 sts=4 sw=4 noet: */