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[perl5.git] / pad.h
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1/* pad.h
2 *
1129b882 3 * Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008 by Larry Wall and others
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4 *
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.
7 *
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.
11 */
12
13
14
15
16/* a padlist is currently just an AV; but that might change,
17 * so hide the type. Ditto a pad. */
18
19typedef AV PADLIST;
f3548bdc 20typedef AV PAD;
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21
22
23/* offsets within a pad */
24
25#if PTRSIZE == 4
26typedef U32TYPE PADOFFSET;
27#else
28# if PTRSIZE == 8
29typedef U64TYPE PADOFFSET;
30# endif
31#endif
32#define NOT_IN_PAD ((PADOFFSET) -1)
809abb02 33
7948fc08 34/* B.xs needs these for the benefit of B::Deparse */
809abb02 35/* Low range end is exclusive (valid from the cop seq after this one) */
809abb02 36/* High range end is inclusive (valid up to this cop seq) */
809abb02 37
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38#if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
39# define COP_SEQ_RANGE_LOW(sv) \
b1bc3f34 40 (({ const SV *const _sv_cop_seq_range_low = (const SV *) (sv); \
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41 assert(SvTYPE(_sv_cop_seq_range_low) == SVt_NV \
42 || SvTYPE(_sv_cop_seq_range_low) >= SVt_PVNV); \
43 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVAV); \
44 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVHV); \
45 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVCV); \
46 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVFM); \
47 assert(!isGV_with_GP(_sv_cop_seq_range_low)); \
b1bc3f34 48 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_low)))->xnv_u.xpad_cop_seq.xlow; \
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49 }))
50# define COP_SEQ_RANGE_HIGH(sv) \
b1bc3f34 51 (({ const SV *const _sv_cop_seq_range_high = (const SV *) (sv); \
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52 assert(SvTYPE(_sv_cop_seq_range_high) == SVt_NV \
53 || SvTYPE(_sv_cop_seq_range_high) >= SVt_PVNV); \
54 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVAV); \
55 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVHV); \
56 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVCV); \
57 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVFM); \
58 assert(!isGV_with_GP(_sv_cop_seq_range_high)); \
b1bc3f34 59 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_high)))->xnv_u.xpad_cop_seq.xhigh; \
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60 }))
61# define PARENT_PAD_INDEX(sv) \
b1bc3f34 62 (({ const SV *const _sv_parent_pad_index = (const SV *) (sv); \
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63 assert(SvTYPE(_sv_parent_pad_index) == SVt_NV \
64 || SvTYPE(_sv_parent_pad_index) >= SVt_PVNV); \
65 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVAV); \
66 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVHV); \
67 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVCV); \
68 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVFM); \
69 assert(!isGV_with_GP(_sv_parent_pad_index)); \
b1bc3f34 70 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_pad_index)))->xnv_u.xpad_cop_seq.xlow; \
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71 }))
72# define PARENT_FAKELEX_FLAGS(sv) \
b1bc3f34 73 (({ const SV *const _sv_parent_fakelex_flags = (const SV *) (sv); \
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74 assert(SvTYPE(_sv_parent_fakelex_flags) == SVt_NV \
75 || SvTYPE(_sv_parent_fakelex_flags) >= SVt_PVNV); \
76 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVAV); \
77 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVHV); \
78 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVCV); \
79 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVFM); \
80 assert(!isGV_with_GP(_sv_parent_fakelex_flags)); \
b1bc3f34 81 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_fakelex_flags)))->xnv_u.xpad_cop_seq.xhigh; \
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82 }))
83#else
84# define COP_SEQ_RANGE_LOW(sv) \
85 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
86# define COP_SEQ_RANGE_HIGH(sv) \
87 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
88
89
90# define PARENT_PAD_INDEX(sv) \
91 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
92# define PARENT_FAKELEX_FLAGS(sv) \
93 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
94#endif
dd2155a4 95
6c5e080d 96/* Flags set in the SvIVX field of FAKE namesvs */
7948fc08 97
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98#define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
99#define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
100
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101/* flags for the pad_new() function */
102
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103#define padnew_CLONE 1 /* this pad is for a cloned CV */
104#define padnew_SAVE 2 /* save old globals */
105#define padnew_SAVESUB 4 /* also save extra stuff for start of sub */
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106
107/* values for the pad_tidy() function */
108
109typedef enum {
110 padtidy_SUB, /* tidy up a pad for a sub, */
111 padtidy_SUBCLONE, /* a cloned sub, */
112 padtidy_FORMAT /* or a format */
113} padtidy_type;
114
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115#ifdef PERL_CORE
116
73b81b14 117/* flags for pad_add_name. SVf_UTF8 will also be valid in the future. */
35f82371 118
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119# define padadd_OUR 0x01 /* our declaration. */
120# define padadd_STATE 0x02 /* state declaration. */
121# define padadd_NO_DUP_CHECK 0x04 /* skip warning on dups. */
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122
123#endif
124
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125/* ASSERT_CURPAD_LEGAL and ASSERT_CURPAD_ACTIVE respectively determine
126 * whether PL_comppad and PL_curpad are consistent and whether they have
127 * active values */
dd2155a4 128
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129#ifndef PERL_MAD
130# define pad_peg(label)
131#endif
132
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133#ifdef DEBUGGING
134# define ASSERT_CURPAD_LEGAL(label) \
1dba731d 135 pad_peg(label); \
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136 if (PL_comppad ? (AvARRAY(PL_comppad) != PL_curpad) : (PL_curpad != 0)) \
137 Perl_croak(aTHX_ "panic: illegal pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
138 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
139
140
141# define ASSERT_CURPAD_ACTIVE(label) \
1dba731d 142 pad_peg(label); \
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143 if (!PL_comppad || (AvARRAY(PL_comppad) != PL_curpad)) \
144 Perl_croak(aTHX_ "panic: invalid pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
145 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
146#else
147# define ASSERT_CURPAD_LEGAL(label)
148# define ASSERT_CURPAD_ACTIVE(label)
149#endif
150
151
152
153/* Note: the following three macros are actually defined in scope.h, but
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154 * they are documented here for completeness, since they directly or
155 * indirectly affect pads.
156
157=for apidoc m|void|SAVEPADSV |PADOFFSET po
158Save a pad slot (used to restore after an iteration)
159
f3548bdc 160XXX DAPM it would make more sense to make the arg a PADOFFSET
dd2155a4 161=for apidoc m|void|SAVECLEARSV |SV **svp
eeb8d49e 162Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')
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163
164=for apidoc m|void|SAVECOMPPAD
165save PL_comppad and PL_curpad
166
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167
168
169
170
171=for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv
172Set the slot at offset C<po> in the current pad to C<sv>
173
174=for apidoc m|void|PAD_SV |PADOFFSET po
175Get the value at offset C<po> in the current pad
176
177=for apidoc m|SV *|PAD_SVl |PADOFFSET po
178Lightweight and lvalue version of C<PAD_SV>.
179Get or set the value at offset C<po> in the current pad.
180Unlike C<PAD_SV>, does not print diagnostics with -DX.
181For internal use only.
182
183=for apidoc m|SV *|PAD_BASE_SV |PADLIST padlist|PADOFFSET po
184Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
185
186=for apidoc m|void|PAD_SET_CUR |PADLIST padlist|I32 n
187Set the current pad to be pad C<n> in the padlist, saving
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188the previous current pad. NB currently this macro expands to a string too
189long for some compilers, so it's best to replace it with
190
191 SAVECOMPPAD();
192 PAD_SET_CUR_NOSAVE(padlist,n);
193
dd2155a4 194
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195=for apidoc m|void|PAD_SET_CUR_NOSAVE |PADLIST padlist|I32 n
196like PAD_SET_CUR, but without the save
197
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198=for apidoc m|void|PAD_SAVE_SETNULLPAD
199Save the current pad then set it to null.
200
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201=for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad
202Save the current pad to the local variable opad, then make the
203current pad equal to npad
204
205=for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad
206Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
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207
208=cut
209*/
210
211#ifdef DEBUGGING
212# define PAD_SV(po) pad_sv(po)
213# define PAD_SETSV(po,sv) pad_setsv(po,sv)
214#else
215# define PAD_SV(po) (PL_curpad[po])
216# define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
217#endif
218
219#define PAD_SVl(po) (PL_curpad[po])
220
221#define PAD_BASE_SV(padlist, po) \
222 (AvARRAY(padlist)[1]) \
a062e10d 223 ? AvARRAY(MUTABLE_AV((AvARRAY(padlist)[1])))[po] : NULL;
7948fc08 224
dd2155a4 225
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226#define PAD_SET_CUR_NOSAVE(padlist,nth) \
227 PL_comppad = (PAD*) (AvARRAY(padlist)[nth]); \
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228 PL_curpad = AvARRAY(PL_comppad); \
229 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
230 "Pad 0x%"UVxf"[0x%"UVxf"] set_cur depth=%d\n", \
de5e01c2 231 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));
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232
233
de5e01c2 234#define PAD_SET_CUR(padlist,nth) \
4e380990 235 SAVECOMPPAD(); \
de5e01c2 236 PAD_SET_CUR_NOSAVE(padlist,nth);
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237
238
f3548bdc 239#define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
4608196e 240 PL_comppad = NULL; PL_curpad = NULL; \
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241 DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
242
243#define PAD_SAVE_LOCAL(opad,npad) \
244 opad = PL_comppad; \
245 PL_comppad = (npad); \
4608196e 246 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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247 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
248 "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n", \
249 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
250
251#define PAD_RESTORE_LOCAL(opad) \
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252 assert(!opad || !SvIS_FREED(opad)); \
253 PL_comppad = opad; \
4608196e 254 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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255 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
256 "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n", \
257 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
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258
259
260/*
261=for apidoc m|void|CX_CURPAD_SAVE|struct context
262Save the current pad in the given context block structure.
263
f3548bdc 264=for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po
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265Access the SV at offset po in the saved current pad in the given
266context block structure (can be used as an lvalue).
267
268=cut
269*/
270
f3548bdc 271#define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
a062e10d 272#define CX_CURPAD_SV(block,po) (AvARRAY(MUTABLE_AV(((block).oldcomppad)))[po])
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273
274
275/*
276=for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po
277Return the flags for the current compiling pad name
278at offset C<po>. Assumes a valid slot entry.
279
280=for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po
281Return the name of the current compiling pad name
282at offset C<po>. Assumes a valid slot entry.
283
284=for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po
285Return the type (stash) of the current compiling pad name at offset
286C<po>. Must be a valid name. Returns null if not typed.
287
288=for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po
289Return the stash associated with an C<our> variable.
290Assumes the slot entry is a valid C<our> lexical.
291
292=for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po
293The generation number of the name at offset C<po> in the current
931b58fb 294compiling pad (lvalue). Note that C<SvUVX> is hijacked for this purpose.
dd2155a4 295
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296=for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen
297Sets the generation number of the name at offset C<po> in the current
931b58fb 298ling pad (lvalue) to C<gen>. Note that C<SvUV_set> is hijacked for this purpose.
b162af07 299
dd2155a4 300=cut
b162af07 301
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302*/
303
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304#define PAD_COMPNAME_SV(po) (*av_fetch(PL_comppad_name, (po), FALSE))
305#define PAD_COMPNAME_FLAGS(po) SvFLAGS(PAD_COMPNAME_SV(po))
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306#define PAD_COMPNAME_FLAGS_isOUR(po) \
307 ((PAD_COMPNAME_FLAGS(po) & (SVpad_NAME|SVpad_OUR)) == (SVpad_NAME|SVpad_OUR))
f8503592 308#define PAD_COMPNAME_PV(po) SvPV_nolen(PAD_COMPNAME_SV(po))
dd2155a4 309
b21dc031 310#define PAD_COMPNAME_TYPE(po) pad_compname_type(po)
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311
312#define PAD_COMPNAME_OURSTASH(po) \
73d95100 313 (SvOURSTASH(PAD_COMPNAME_SV(po)))
dd2155a4 314
931b58fb 315#define PAD_COMPNAME_GEN(po) ((STRLEN)SvUVX(AvARRAY(PL_comppad_name)[po]))
dd2155a4 316
931b58fb 317#define PAD_COMPNAME_GEN_set(po, gen) SvUV_set(AvARRAY(PL_comppad_name)[po], (UV)(gen))
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318
319
320/*
321=for apidoc m|void|PAD_DUP|PADLIST dstpad|PADLIST srcpad|CLONE_PARAMS* param
322Clone a padlist.
323
d77cdebf 324=for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl|CLONE_PARAMS* param
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325Clone the state variables associated with running and compiling pads.
326
327=cut
328*/
329
330
331#define PAD_DUP(dstpad, srcpad, param) \
332 if ((srcpad) && !AvREAL(srcpad)) { \
333 /* XXX padlists are real, but pretend to be not */ \
334 AvREAL_on(srcpad); \
335 (dstpad) = av_dup_inc((srcpad), param); \
336 AvREAL_off(srcpad); \
337 AvREAL_off(dstpad); \
338 } \
339 else \
340 (dstpad) = av_dup_inc((srcpad), param);
341
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342/* NB - we set PL_comppad to null unless it points at a value that
343 * has already been dup'ed, ie it points to part of an active padlist.
344 * Otherwise PL_comppad ends up being a leaked scalar in code like
345 * the following:
346 * threads->create(sub { threads->create(sub {...} ) } );
347 * where the second thread dups the outer sub's comppad but not the
348 * sub's CV or padlist. */
f3548bdc 349
dd2155a4 350#define PAD_CLONE_VARS(proto_perl, param) \
a062e10d 351 PL_comppad = MUTABLE_AV(ptr_table_fetch(PL_ptr_table, proto_perl->Icomppad)); \
4608196e 352 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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353 PL_comppad_name = av_dup(proto_perl->Icomppad_name, param); \
354 PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \
355 PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \
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356 PL_min_intro_pending = proto_perl->Imin_intro_pending; \
357 PL_max_intro_pending = proto_perl->Imax_intro_pending; \
358 PL_padix = proto_perl->Ipadix; \
359 PL_padix_floor = proto_perl->Ipadix_floor; \
360 PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \
361 PL_cop_seqmax = proto_perl->Icop_seqmax;
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362
363/*
364 * Local variables:
365 * c-indentation-style: bsd
366 * c-basic-offset: 4
367 * indent-tabs-mode: t
368 * End:
369 *
370 * ex: set ts=8 sts=4 sw=4 noet:
371 */