3 * Copyright (C) 2002, 2003, 2005, by Larry Wall and others
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
8 * This file defines the types and macros associated with the API for
9 * manipulating scratchpads, which are used by perl to store lexical
10 * variables, op targets and constants.
16 /* a padlist is currently just an AV; but that might change,
17 * so hide the type. Ditto a pad. */
23 /* offsets within a pad */
26 typedef U32TYPE PADOFFSET;
29 typedef U64TYPE PADOFFSET;
32 #define NOT_IN_PAD ((PADOFFSET) -1)
34 /* B.xs needs these for the benefit of B::Deparse */
35 /* Low range end is exclusive (valid from the cop seq after this one) */
36 #define COP_SEQ_RANGE_LOW(sv) U_32(SvNVX(sv))
37 /* High range end is inclusive (valid up to this cop seq) */
38 #define COP_SEQ_RANGE_HIGH(sv) U_32(SvUVX(sv))
40 #define PARENT_PAD_INDEX(sv) U_32(SvNVX(sv))
41 #define PARENT_FAKELEX_FLAGS(sv) U_32(SvUVX(sv))
43 /* Flags set in the SvIVX field of FAKE namesvs */
45 #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
46 #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
48 /* flags for the pad_new() function */
50 #define padnew_CLONE 1 /* this pad is for a cloned CV */
51 #define padnew_SAVE 2 /* save old globals */
52 #define padnew_SAVESUB 4 /* also save extra stuff for start of sub */
54 /* values for the pad_tidy() function */
57 padtidy_SUB, /* tidy up a pad for a sub, */
58 padtidy_SUBCLONE, /* a cloned sub, */
59 padtidy_FORMAT /* or a format */
62 /* ASSERT_CURPAD_LEGAL and ASSERT_CURPAD_ACTIVE respectively determine
63 * whether PL_comppad and PL_curpad are consistent and whether they have
67 # define ASSERT_CURPAD_LEGAL(label) \
68 if (PL_comppad ? (AvARRAY(PL_comppad) != PL_curpad) : (PL_curpad != 0)) \
69 Perl_croak(aTHX_ "panic: illegal pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
70 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
73 # define ASSERT_CURPAD_ACTIVE(label) \
74 if (!PL_comppad || (AvARRAY(PL_comppad) != PL_curpad)) \
75 Perl_croak(aTHX_ "panic: invalid pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
76 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
78 # define ASSERT_CURPAD_LEGAL(label)
79 # define ASSERT_CURPAD_ACTIVE(label)
84 /* Note: the following three macros are actually defined in scope.h, but
85 * they are documented here for completeness, since they directly or
86 * indirectly affect pads.
88 =for apidoc m|void|SAVEPADSV |PADOFFSET po
89 Save a pad slot (used to restore after an iteration)
91 XXX DAPM it would make more sense to make the arg a PADOFFSET
92 =for apidoc m|void|SAVECLEARSV |SV **svp
93 Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')
95 =for apidoc m|void|SAVECOMPPAD
96 save PL_comppad and PL_curpad
102 =for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv
103 Set the slot at offset C<po> in the current pad to C<sv>
105 =for apidoc m|void|PAD_SV |PADOFFSET po
106 Get the value at offset C<po> in the current pad
108 =for apidoc m|SV *|PAD_SVl |PADOFFSET po
109 Lightweight and lvalue version of C<PAD_SV>.
110 Get or set the value at offset C<po> in the current pad.
111 Unlike C<PAD_SV>, does not print diagnostics with -DX.
112 For internal use only.
114 =for apidoc m|SV *|PAD_BASE_SV |PADLIST padlist|PADOFFSET po
115 Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
117 =for apidoc m|void|PAD_SET_CUR |PADLIST padlist|I32 n
118 Set the current pad to be pad C<n> in the padlist, saving
119 the previous current pad. NB currently this macro expands to a string too
120 long for some compilers, so it's best to replace it with
123 PAD_SET_CUR_NOSAVE(padlist,n);
126 =for apidoc m|void|PAD_SET_CUR_NOSAVE |PADLIST padlist|I32 n
127 like PAD_SET_CUR, but without the save
129 =for apidoc m|void|PAD_SAVE_SETNULLPAD
130 Save the current pad then set it to null.
132 =for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad
133 Save the current pad to the local variable opad, then make the
134 current pad equal to npad
136 =for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad
137 Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
143 # define PAD_SV(po) pad_sv(po)
144 # define PAD_SETSV(po,sv) pad_setsv(po,sv)
146 # define PAD_SV(po) (PL_curpad[po])
147 # define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
150 #define PAD_SVl(po) (PL_curpad[po])
152 #define PAD_BASE_SV(padlist, po) \
153 (AvARRAY(padlist)[1]) \
154 ? AvARRAY((AV*)(AvARRAY(padlist)[1]))[po] : NULL;
157 #define PAD_SET_CUR_NOSAVE(padlist,nth) \
158 PL_comppad = (PAD*) (AvARRAY(padlist)[nth]); \
159 PL_curpad = AvARRAY(PL_comppad); \
160 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
161 "Pad 0x%"UVxf"[0x%"UVxf"] set_cur depth=%d\n", \
162 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));
165 #define PAD_SET_CUR(padlist,nth) \
167 PAD_SET_CUR_NOSAVE(padlist,nth);
170 #define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
171 PL_comppad = NULL; PL_curpad = NULL; \
172 DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
174 #define PAD_SAVE_LOCAL(opad,npad) \
176 PL_comppad = (npad); \
177 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
178 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
179 "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n", \
180 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
182 #define PAD_RESTORE_LOCAL(opad) \
184 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
185 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
186 "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n", \
187 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
191 =for apidoc m|void|CX_CURPAD_SAVE|struct context
192 Save the current pad in the given context block structure.
194 =for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po
195 Access the SV at offset po in the saved current pad in the given
196 context block structure (can be used as an lvalue).
201 #define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
202 #define CX_CURPAD_SV(block,po) (AvARRAY((AV*)((block).oldcomppad))[po])
206 =for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po
207 Return the flags for the current compiling pad name
208 at offset C<po>. Assumes a valid slot entry.
210 =for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po
211 Return the name of the current compiling pad name
212 at offset C<po>. Assumes a valid slot entry.
214 =for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po
215 Return the type (stash) of the current compiling pad name at offset
216 C<po>. Must be a valid name. Returns null if not typed.
218 =for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po
219 Return the stash associated with an C<our> variable.
220 Assumes the slot entry is a valid C<our> lexical.
222 =for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po
223 The generation number of the name at offset C<po> in the current
224 compiling pad (lvalue). Note that C<SvCUR> is hijacked for this purpose.
226 =for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen
227 Sets the generation number of the name at offset C<po> in the current
228 ling pad (lvalue) to C<gen>. Note that C<SvCUR_set> is hijacked for this purpose.
234 #define PAD_COMPNAME_SV(po) (*av_fetch(PL_comppad_name, (po), FALSE))
235 #define PAD_COMPNAME_FLAGS(po) SvFLAGS(PAD_COMPNAME_SV(po))
236 #define PAD_COMPNAME_FLAGS_isOUR(po) (PAD_COMPNAME_FLAGS(po) & SVpad_OUR)
237 #define PAD_COMPNAME_PV(po) SvPV_nolen(PAD_COMPNAME_SV(po))
239 #define PAD_COMPNAME_TYPE(po) pad_compname_type(po)
241 #define PAD_COMPNAME_OURSTASH(po) \
242 (SvOURSTASH(PAD_COMPNAME_SV(po)))
244 #define PAD_COMPNAME_GEN(po) SvCUR(AvARRAY(PL_comppad_name)[po])
246 #define PAD_COMPNAME_GEN_set(po, gen) SvCUR_set(AvARRAY(PL_comppad_name)[po], gen)
250 =for apidoc m|void|PAD_DUP|PADLIST dstpad|PADLIST srcpad|CLONE_PARAMS* param
253 =for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl \
255 Clone the state variables associated with running and compiling pads.
261 #define PAD_DUP(dstpad, srcpad, param) \
262 if ((srcpad) && !AvREAL(srcpad)) { \
263 /* XXX padlists are real, but pretend to be not */ \
265 (dstpad) = av_dup_inc((srcpad), param); \
266 AvREAL_off(srcpad); \
267 AvREAL_off(dstpad); \
270 (dstpad) = av_dup_inc((srcpad), param);
272 /* NB - we set PL_comppad to null unless it points at a value that
273 * has already been dup'ed, ie it points to part of an active padlist.
274 * Otherwise PL_comppad ends up being a leaked scalar in code like
276 * threads->create(sub { threads->create(sub {...} ) } );
277 * where the second thread dups the outer sub's comppad but not the
278 * sub's CV or padlist. */
280 #define PAD_CLONE_VARS(proto_perl, param) \
281 PL_comppad = ptr_table_fetch(PL_ptr_table, proto_perl->Tcomppad); \
282 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
283 PL_comppad_name = av_dup(proto_perl->Icomppad_name, param); \
284 PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \
285 PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \
286 PL_min_intro_pending = proto_perl->Imin_intro_pending; \
287 PL_max_intro_pending = proto_perl->Imax_intro_pending; \
288 PL_padix = proto_perl->Ipadix; \
289 PL_padix_floor = proto_perl->Ipadix_floor; \
290 PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \
291 PL_cop_seqmax = proto_perl->Icop_seqmax;