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pad.h
/* 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 */ typedef SSize_t PADOFFSET; /* signed so that -1 is a valid value */ #define NOT_IN_PAD ((PADOFFSET) -1) /* B.xs expects the first members of these two structs to line up (xpadl_max with xpadnl_fill). */ struct padlist { SSize_t xpadl_max; /* max index for which array has space */ union { PAD ** xpadlarr_alloc; /* Pointer to beginning of array of AVs. index 0 is a padnamelist * */ struct { PADNAMELIST * padnl; PAD * pad_1; /* this slice of PAD * array always alloced */ PAD * pad_2; /* maybe unalloced */ } * xpadlarr_dbg; /* for use with a C debugger only */ } xpadl_arr; U32 xpadl_id; /* Semi-unique ID, shared between clones */ U32 xpadl_outid; /* ID of outer pad */ }; struct padnamelist { SSize_t xpadnl_fill; /* max index in use */ PADNAME ** xpadnl_alloc; /* pointer to beginning of array */ SSize_t xpadnl_max; /* max index for which array has space */ PADOFFSET xpadnl_max_named; /* highest index with len > 0 */ U32 xpadnl_refcnt; }; /* PERL_PADNAME_MINIMAL uses less memory, but on some platforms PERL_PADNAME_ALIGNED may be faster, so platform-specific hints can define one or the other. */ #if defined(PERL_PADNAME_MINIMAL) && defined (PERL_PADNAME_ALIGNED) # error PERL_PADNAME_MINIMAL and PERL_PADNAME_ALIGNED are exclusive #endif #if !defined(PERL_PADNAME_MINIMAL) && !defined(PERL_PADNAME_ALIGNED) # define PERL_PADNAME_MINIMAL #endif #define _PADNAME_BASE \ char * xpadn_pv; \ HV * xpadn_ourstash; \ union { \ HV * xpadn_typestash; \ CV * xpadn_protocv; \ } xpadn_type_u; \ U32 xpadn_low; \ U32 xpadn_high; \ U32 xpadn_refcnt; \ int xpadn_gen; \ U8 xpadn_len; \ U8 xpadn_flags struct padname { _PADNAME_BASE; }; struct padname_with_str { #ifdef PERL_PADNAME_MINIMAL _PADNAME_BASE; #else struct padname xpadn_padname; #endif char xpadn_str[1]; }; #undef _PADNAME_BASE #define PADNAME_FROM_PV(s) \ ((PADNAME *)((s) - STRUCT_OFFSET(struct padname_with_str, xpadn_str))) /* 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 #define COP_SEQMAX_INC \ (PL_cop_seqmax++, \ (void)(PL_cop_seqmax == PERL_PADSEQ_INTRO && PL_cop_seqmax++)) /* 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) */ #define COP_SEQ_RANGE_LOW(pn) (pn)->xpadn_low #define COP_SEQ_RANGE_HIGH(pn) (pn)->xpadn_high #define PARENT_PAD_INDEX(pn) (pn)->xpadn_low #define PARENT_FAKELEX_FLAGS(pn) (pn)->xpadn_high /* 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 */ /* 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 C<my>) =for apidoc m|void|SAVECOMPPAD save C<PL_comppad> and C<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 C<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|SSize_t|PadnamelistREFCNT|PADNAMELIST pnl The reference count of the pad name list. =for apidoc Amx|void|PadnamelistREFCNT_dec|PADNAMELIST pnl Lowers the reference count of the pad name list. =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 C<NULL> for a target slot. =for apidoc Amx|STRLEN|PadnameLEN|PADNAME pn The length of the name. =for apidoc Amx|bool|PadnameUTF8|PADNAME pn Whether PadnamePV is in UTF-8. Currently, this is always true. =for apidoc Amx|SV *|PadnameSV|PADNAME pn Returns the pad name as a mortal SV. =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. Entries for which this is true are often referred to as 'fake'. =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 C<%Foo::> hash for C<my Foo $bar>. =for apidoc Amx|SSize_t|PadnameREFCNT|PADNAME pn The reference count of the pad name. =for apidoc Amx|void|PadnameREFCNT_dec|PADNAME pn Lowers the reference count of the pad name. =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|SV *|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 C<opad>, then make the current pad equal to C<npad> =for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad Restore the old pad saved into the local variable C<opad> by C<PAD_SAVE_LOCAL()> =cut */ #define PadlistARRAY(pl) (pl)->xpadl_arr.xpadlarr_alloc #define PadlistMAX(pl) (pl)->xpadl_max #define PadlistNAMES(pl) *((PADNAMELIST **)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) (pnl)->xpadnl_alloc #define PadnamelistMAX(pnl) (pnl)->xpadnl_fill #define PadnamelistMAXNAMED(pnl) (pnl)->xpadnl_max_named #define PadnamelistREFCNT(pnl) (pnl)->xpadnl_refcnt #define PadnamelistREFCNT_dec(pnl) Perl_padnamelist_free(aTHX_ pnl) #define PadARRAY(pad) AvARRAY(pad) #define PadMAX(pad) AvFILLp(pad) #define PadnamePV(pn) (pn)->xpadn_pv #define PadnameLEN(pn) (pn)->xpadn_len #define PadnameUTF8(pn) 1 #define PadnameSV(pn) \ newSVpvn_flags(PadnamePV(pn), PadnameLEN(pn), SVs_TEMP|SVf_UTF8) #define PadnameFLAGS(pn) (pn)->xpadn_flags #define PadnameIsOUR(pn) (!!(pn)->xpadn_ourstash) #define PadnameOURSTASH(pn) (pn)->xpadn_ourstash #define PadnameTYPE(pn) (pn)->xpadn_type_u.xpadn_typestash #define PadnamePROTOCV(pn) (pn)->xpadn_type_u.xpadn_protocv #define PadnameREFCNT(pn) (pn)->xpadn_refcnt #define PadnameREFCNT_dec(pn) Perl_padname_free(aTHX_ pn) #define PadnameOURSTASH_set(pn,s) (PadnameOURSTASH(pn) = (s)) #define PadnameTYPE_set(pn,s) (PadnameTYPE(pn) = (s)) #define PadnameOUTER(pn) (PadnameFLAGS(pn) & PADNAMEt_OUTER) #define PadnameIsSTATE(pn) (PadnameFLAGS(pn) & PADNAMEt_STATE) #define PadnameLVALUE(pn) (PadnameFLAGS(pn) & PADNAMEt_LVALUE) #define PadnameLVALUE_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_LVALUE) #define PadnameIsSTATE_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_STATE) #define PADNAMEt_OUTER 1 /* outer lexical var */ #define PADNAMEt_STATE 2 /* state var */ #define PADNAMEt_LVALUE 4 /* used as lvalue */ #define PADNAMEt_TYPED 8 /* for B; unused by core */ #define PADNAMEt_OUR 16 /* for B; unused by core */ /* backward compatibility */ #define SvPAD_STATE PadnameIsSTATE #define SvPAD_TYPED(pn) (!!PadnameTYPE(pn)) #define SvPAD_OUR(pn) (!!PadnameOURSTASH(pn)) #define SvPAD_STATE_on PadnameIsSTATE_on #define SvPAD_TYPED_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_TYPED) #define SvPAD_OUR_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_OUR) #define SvOURSTASH PadnameOURSTASH #define SvOURSTASH_set PadnameOURSTASH_set #define SVpad_STATE PADNAMEt_STATE #define SVpad_TYPED PADNAMEt_TYPED #define SVpad_OUR PADNAMEt_OUR #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 C<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). =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>. =cut */ #define PAD_COMPNAME(po) PAD_COMPNAME_SV(po) #define PAD_COMPNAME_SV(po) (PadnamelistARRAY(PL_comppad_name)[(po)]) #define PAD_COMPNAME_FLAGS(po) PadnameFLAGS(PAD_COMPNAME(po)) #define PAD_COMPNAME_FLAGS_isOUR(po) SvPAD_OUR(PAD_COMPNAME_SV(po)) #define PAD_COMPNAME_PV(po) PadnamePV(PAD_COMPNAME(po)) #define PAD_COMPNAME_TYPE(po) PadnameTYPE(PAD_COMPNAME(po)) #define PAD_COMPNAME_OURSTASH(po) \ (SvOURSTASH(PAD_COMPNAME_SV(po))) #define PAD_COMPNAME_GEN(po) \ ((STRLEN)PadnamelistARRAY(PL_comppad_name)[po]->xpadn_gen) #define PAD_COMPNAME_GEN_set(po, gen) \ (PadnamelistARRAY(PL_comppad_name)[po]->xpadn_gen = (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 = \ padnamelist_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 C<NUL>-terminated 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 C<NUL>-terminated 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) /* * ex: set ts=8 sts=4 sw=4 et: */
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