/* 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 */ /* 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) struct padlist { SSize_t xpadl_max; /* max index for which array has space */ PAD ** xpadl_alloc; /* pointer to beginning of array of AVs */ PADNAMELIST*xpadl_outid; /* Padnamelist of outer pad; used as ID */ }; /* 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_STALEOK 0x08 /* allow stale lexical in active * sub, but only one level up */ #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 */ # define pad_peg(label) #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 Amx|PAD **|PadlistARRAY|PADLIST padlist The C array of a padlist, containing the pads. Only subscript it with numbers >= 1, as the 0th entry is not guaranteed to remain usable. =for apidoc Amx|SSize_t|PadlistMAX|PADLIST padlist The index of the last allocated space in the padlist. Note that the last pad may be in an earlier slot. Any entries following it will be NULL in that case. =for apidoc Amx|PADNAMELIST *|PadlistNAMES|PADLIST padlist The names associated with pad entries. =for apidoc Amx|PADNAME **|PadlistNAMESARRAY|PADLIST padlist The C array of pad names. =for apidoc Amx|SSize_t|PadlistNAMESMAX|PADLIST padlist The index of the last pad name. =for apidoc Amx|U32|PadlistREFCNT|PADLIST padlist The reference count of the padlist. Currently this is always 1. =for apidoc Amx|PADNAME **|PadnamelistARRAY|PADNAMELIST pnl The C array of pad names. =for apidoc Amx|SSize_t|PadnamelistMAX|PADNAMELIST pnl The index of the last pad name. =for apidoc Amx|SV **|PadARRAY|PAD pad The C array of pad entries. =for apidoc Amx|SSize_t|PadMAX|PAD pad The index of the last pad entry. =for apidoc Amx|char *|PadnamePV|PADNAME pn The name stored in the pad name struct. This returns NULL for a target or GV slot. =for apidoc Amx|STRLEN|PadnameLEN|PADNAME pn The length of the name. =for apidoc Amx|bool|PadnameUTF8|PADNAME pn Whether PadnamePV is in UTF8. =for apidoc Amx|SV *|PadnameSV|PADNAME pn Returns the pad name as an SV. This is currently just C. It will begin returning a new mortal SV if pad names ever stop being SVs. =for apidoc m|bool|PadnameIsOUR|PADNAME pn Whether this is an "our" variable. =for apidoc m|HV *|PadnameOURSTASH The stash in which this "our" variable was declared. =for apidoc m|bool|PadnameOUTER|PADNAME pn Whether this entry belongs to an outer pad. =for apidoc m|bool|PadnameIsSTATE|PADNAME pn Whether this is a "state" variable. =for apidoc m|HV *|PadnameTYPE|PADNAME pn The stash associated with a typed lexical. This returns the %Foo:: hash for C. =for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv Set the slot at offset C in the current pad to C =for apidoc m|SV *|PAD_SV |PADOFFSET po Get the value at offset C in the current pad =for apidoc m|SV *|PAD_SVl |PADOFFSET po Lightweight and lvalue version of C. Get or set the value at offset C in the current pad. Unlike C, 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 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 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 */ #define PadlistARRAY(pl) (pl)->xpadl_alloc #define PadlistMAX(pl) (pl)->xpadl_max #define PadlistNAMES(pl) (*PadlistARRAY(pl)) #define PadlistNAMESARRAY(pl) PadnamelistARRAY(PadlistNAMES(pl)) #define PadlistNAMESMAX(pl) PadnamelistMAX(PadlistNAMES(pl)) #define PadlistREFCNT(pl) 1 /* reserved for future use */ #define PadnamelistARRAY(pnl) AvARRAY(pnl) #define PadnamelistMAX(pnl) AvFILLp(pnl) #define PadnamelistMAXNAMED(pnl) \ ((XPVAV*) SvANY(pnl))->xmg_u.xmg_hash_index #define PadARRAY(pad) AvARRAY(pad) #define PadMAX(pad) AvFILLp(pad) #define PadnamePV(pn) (SvPOKp(pn) ? SvPVX(pn) : NULL) #define PadnameLEN(pn) ((pn) == &PL_sv_undef ? 0 : SvCUR(pn)) #define PadnameUTF8(pn) !!SvUTF8(pn) #define PadnameSV(pn) pn #define PadnameIsOUR(pn) !!SvPAD_OUR(pn) #define PadnameOURSTASH(pn) SvOURSTASH(pn) #define PadnameOUTER(pn) !!SvFAKE(pn) #define PadnameIsSTATE(pn) !!SvPAD_STATE(pn) #define PadnameTYPE(pn) (SvPAD_TYPED(pn) ? SvSTASH(pn) : NULL) #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) \ (PadlistARRAY(padlist)[1]) \ ? AvARRAY(MUTABLE_AV((PadlistARRAY(padlist)[1])))[po] \ : NULL; #define PAD_SET_CUR_NOSAVE(padlist,nth) \ PL_comppad = (PAD*) (PadlistARRAY(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. 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. 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. 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 variable. Assumes the slot entry is a valid C lexical. =for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po The generation number of the name at offset C in the current compiling pad (lvalue). Note that C 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 in the current ling pad (lvalue) to C. Note that C is hijacked for this purpose. =cut */ #define PAD_COMPNAME(po) PAD_COMPNAME_SV(po) #define PAD_COMPNAME_SV(po) (AvARRAY(PL_comppad_name)[(po)]) #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, 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, 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: nil * End: * * ex: set ts=8 sts=4 sw=4 et: */