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perl5.git.perl.org Git - perl5.git/blob - pad.h
1 /* pad.h
2 *
3 * Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008,
4 * 2009, 2010, 2011 by Larry Wall and others
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
9 * This file defines the types and macros associated with the API for
10 * manipulating scratchpads, which are used by perl to store lexical
11 * variables, op targets and constants.
12 */
14 /* offsets within a pad */
16 typedef SSize_t PADOFFSET; /* signed so that -1 is a valid value */
17 #define NOT_IN_PAD ((PADOFFSET) -1)
19 /* B.xs expects the first members of these two structs to line up
20 (xpadl_max with xpadnl_fill).
21 */
23 struct padlist {
24 SSize_t xpadl_max; /* max index for which array has space */
25 union {
26 PAD ** xpadlarr_alloc; /* Pointer to beginning of array of AVs.
27 index 0 is a padnamelist * */
28 struct {
29 PADNAMELIST * padnl;
30 PAD * pad_1; /* this slice of PAD * array always alloced */
31 PAD * pad_2; /* maybe unalloced */
32 } * xpadlarr_dbg; /* for use with a C debugger only */
33 } xpadl_arr;
34 U32 xpadl_id; /* Semi-unique ID, shared between clones */
35 U32 xpadl_outid; /* ID of outer pad */
36 };
38 struct padnamelist {
39 SSize_t xpadnl_fill; /* max index in use */
40 PADNAME ** xpadnl_alloc; /* pointer to beginning of array */
41 SSize_t xpadnl_max; /* max index for which array has space */
42 PADOFFSET xpadnl_max_named; /* highest index with len > 0 */
43 U32 xpadnl_refcnt;
44 };
46 /* PERL_PADNAME_MINIMAL uses less memory, but on some platforms
47 PERL_PADNAME_ALIGNED may be faster, so platform-specific hints can
48 define one or the other. */
49 #if defined(PERL_PADNAME_MINIMAL) && defined (PERL_PADNAME_ALIGNED)
50 # error PERL_PADNAME_MINIMAL and PERL_PADNAME_ALIGNED are exclusive
51 #endif
53 #if !defined(PERL_PADNAME_MINIMAL) && !defined(PERL_PADNAME_ALIGNED)
54 # define PERL_PADNAME_MINIMAL
55 #endif
57 #define _PADNAME_BASE \
58 char * xpadn_pv; \
59 HV * xpadn_ourstash; \
60 union { \
61 HV * xpadn_typestash; \
62 CV * xpadn_protocv; \
63 } xpadn_type_u; \
64 U32 xpadn_low; \
65 U32 xpadn_high; \
66 U32 xpadn_refcnt; \
67 int xpadn_gen; \
68 U8 xpadn_len; \
69 U8 xpadn_flags
71 struct padname {
72 _PADNAME_BASE;
73 };
75 struct padname_with_str {
76 #ifdef PERL_PADNAME_MINIMAL
77 _PADNAME_BASE;
78 #else
79 struct padname xpadn_padname;
80 #endif
81 char xpadn_str[1];
82 };
84 #undef _PADNAME_BASE
86 #define PADNAME_FROM_PV(s) \
87 ((PADNAME *)((s) - STRUCT_OFFSET(struct padname_with_str, xpadn_str)))
90 /* a value that PL_cop_seqmax is guaranteed never to be,
91 * flagging that a lexical is being introduced, or has not yet left scope
92 */
93 #define PERL_PADSEQ_INTRO U32_MAX
94 #define COP_SEQMAX_INC \
95 (PL_cop_seqmax++, \
96 (void)(PL_cop_seqmax == PERL_PADSEQ_INTRO && PL_cop_seqmax++))
99 /* B.xs needs these for the benefit of B::Deparse */
100 /* Low range end is exclusive (valid from the cop seq after this one) */
101 /* High range end is inclusive (valid up to this cop seq) */
103 #define COP_SEQ_RANGE_LOW(pn) (pn)->xpadn_low
104 #define COP_SEQ_RANGE_HIGH(pn) (pn)->xpadn_high
105 #define PARENT_PAD_INDEX(pn) (pn)->xpadn_low
106 #define PARENT_FAKELEX_FLAGS(pn) (pn)->xpadn_high
108 /* Flags set in the SvIVX field of FAKE namesvs */
110 #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
111 #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
113 /* flags for the pad_new() function */
115 #define padnew_CLONE 1 /* this pad is for a cloned CV */
116 #define padnew_SAVE 2 /* save old globals */
117 #define padnew_SAVESUB 4 /* also save extra stuff for start of sub */
119 /* values for the pad_tidy() function */
121 typedef enum {
122 padtidy_SUB, /* tidy up a pad for a sub, */
123 padtidy_SUBCLONE, /* a cloned sub, */
124 padtidy_FORMAT /* or a format */
125 } padtidy_type;
127 /* flags for pad_add_name_pvn. */
129 #define padadd_OUR 0x01 /* our declaration. */
130 #define padadd_STATE 0x02 /* state declaration. */
131 #define padadd_NO_DUP_CHECK 0x04 /* skip warning on dups. */
132 #define padadd_STALEOK 0x08 /* allow stale lexical in active
133 * sub, but only one level up */
135 /* ASSERT_CURPAD_LEGAL and ASSERT_CURPAD_ACTIVE respectively determine
136 * whether PL_comppad and PL_curpad are consistent and whether they have
137 * active values */
139 # define pad_peg(label)
141 #ifdef DEBUGGING
142 # define ASSERT_CURPAD_LEGAL(label) \
143 pad_peg(label); \
144 if (PL_comppad ? (AvARRAY(PL_comppad) != PL_curpad) : (PL_curpad != 0)) \
145 Perl_croak(aTHX_ "panic: illegal pad in %s: 0x%" UVxf "[0x%" UVxf "]",\
146 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
149 # define ASSERT_CURPAD_ACTIVE(label) \
150 pad_peg(label); \
151 if (!PL_comppad || (AvARRAY(PL_comppad) != PL_curpad)) \
152 Perl_croak(aTHX_ "panic: invalid pad in %s: 0x%" UVxf "[0x%" UVxf "]",\
153 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
154 #else
155 # define ASSERT_CURPAD_LEGAL(label)
156 # define ASSERT_CURPAD_ACTIVE(label)
157 #endif
161 /* Note: the following three macros are actually defined in scope.h, but
162 * they are documented here for completeness, since they directly or
163 * indirectly affect pads.
165 =for apidoc m|void|SAVEPADSV |PADOFFSET po
166 Save a pad slot (used to restore after an iteration)
168 =cut
170 XXX DAPM it would make more sense to make the arg a PADOFFSET
172 =for apidoc m|void|SAVECLEARSV |SV **svp
173 Clear the pointed to pad value on scope exit. (i.e. the runtime action of
174 C<my>)
176 =for apidoc m|void|SAVECOMPPAD
177 save C<PL_comppad> and C<PL_curpad>
180 =for apidoc Amx|PAD **|PadlistARRAY|PADLIST * padlist
181 The C array of a padlist, containing the pads. Only subscript it with
182 numbers >= 1, as the 0th entry is not guaranteed to remain usable.
184 =for apidoc Amx|SSize_t|PadlistMAX|PADLIST * padlist
185 The index of the last allocated space in the padlist. Note that the last
186 pad may be in an earlier slot. Any entries following it will be C<NULL> in
187 that case.
189 =for apidoc Amx|PADNAMELIST *|PadlistNAMES|PADLIST * padlist
190 The names associated with pad entries.
192 =for apidoc Amx|PADNAME **|PadlistNAMESARRAY|PADLIST * padlist
193 The C array of pad names.
195 =for apidoc Amx|SSize_t|PadlistNAMESMAX|PADLIST * padlist
196 The index of the last pad name.
198 =for apidoc Amx|U32|PadlistREFCNT|PADLIST * padlist
199 The reference count of the padlist. Currently this is always 1.
201 =for apidoc Amx|PADNAME **|PadnamelistARRAY|PADNAMELIST * pnl
202 The C array of pad names.
204 =for apidoc Amx|SSize_t|PadnamelistMAX|PADNAMELIST * pnl
205 The index of the last pad name.
207 =for apidoc Amx|SSize_t|PadnamelistREFCNT|PADNAMELIST * pnl
208 The reference count of the pad name list.
210 =for apidoc Amx|void|PadnamelistREFCNT_dec|PADNAMELIST * pnl
211 Lowers the reference count of the pad name list.
213 =for apidoc Amx|SV **|PadARRAY|PAD * pad
214 The C array of pad entries.
216 =for apidoc Amx|SSize_t|PadMAX|PAD * pad
217 The index of the last pad entry.
219 =for apidoc Amx|char *|PadnamePV|PADNAME * pn
220 The name stored in the pad name struct. This returns C<NULL> for a target
221 slot.
223 =for apidoc Amx|STRLEN|PadnameLEN|PADNAME * pn
224 The length of the name.
226 =for apidoc Amx|bool|PadnameUTF8|PADNAME * pn
227 Whether PadnamePV is in UTF-8. Currently, this is always true.
229 =for apidoc Amx|SV *|PadnameSV|PADNAME * pn
230 Returns the pad name as a mortal SV.
232 =for apidoc m|bool|PadnameIsOUR|PADNAME * pn
233 Whether this is an "our" variable.
235 =for apidoc m|HV *|PadnameOURSTASH|PADNAME * pn
236 The stash in which this "our" variable was declared.
238 =for apidoc m|bool|PadnameOUTER|PADNAME * pn
239 Whether this entry belongs to an outer pad. Entries for which this is true
240 are often referred to as 'fake'.
242 =for apidoc m|bool|PadnameIsSTATE|PADNAME * pn
243 Whether this is a "state" variable.
245 =for apidoc m|HV *|PadnameTYPE|PADNAME * pn
246 The stash associated with a typed lexical. This returns the C<%Foo::> hash
247 for C<my Foo $bar>.
249 =for apidoc Amx|SSize_t|PadnameREFCNT|PADNAME * pn
250 The reference count of the pad name.
252 =for apidoc Amx|void|PadnameREFCNT_dec|PADNAME * pn
253 Lowers the reference count of the pad name.
256 =for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv
257 Set the slot at offset C<po> in the current pad to C<sv>
259 =for apidoc m|SV *|PAD_SV |PADOFFSET po
260 Get the value at offset C<po> in the current pad
262 =for apidoc m|SV *|PAD_SVl |PADOFFSET po
263 Lightweight and lvalue version of C<PAD_SV>.
264 Get or set the value at offset C<po> in the current pad.
265 Unlike C<PAD_SV>, does not print diagnostics with -DX.
266 For internal use only.
268 =for apidoc m|SV *|PAD_BASE_SV |PADLIST padlist|PADOFFSET po
269 Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
271 =for apidoc m|void|PAD_SET_CUR |PADLIST padlist|I32 n
272 Set the current pad to be pad C<n> in the padlist, saving
273 the previous current pad. NB currently this macro expands to a string too
274 long for some compilers, so it's best to replace it with
276 SAVECOMPPAD();
277 PAD_SET_CUR_NOSAVE(padlist,n);
280 =for apidoc m|void|PAD_SET_CUR_NOSAVE |PADLIST padlist|I32 n
281 like PAD_SET_CUR, but without the save
283 =for apidoc m|void|PAD_SAVE_SETNULLPAD
284 Save the current pad then set it to null.
286 =for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad
287 Save the current pad to the local variable C<opad>, then make the
288 current pad equal to C<npad>
290 =for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad
291 Restore the old pad saved into the local variable C<opad> by C<PAD_SAVE_LOCAL()>
293 =cut
294 */
296 #define PadlistARRAY(pl) (pl)->xpadl_arr.xpadlarr_alloc
297 #define PadlistMAX(pl) (pl)->xpadl_max
298 #define PadlistNAMES(pl) *((PADNAMELIST **)PadlistARRAY(pl))
299 #define PadlistNAMESARRAY(pl) PadnamelistARRAY(PadlistNAMES(pl))
300 #define PadlistNAMESMAX(pl) PadnamelistMAX(PadlistNAMES(pl))
301 #define PadlistREFCNT(pl) 1 /* reserved for future use */
303 #define PadnamelistARRAY(pnl) (pnl)->xpadnl_alloc
304 #define PadnamelistMAX(pnl) (pnl)->xpadnl_fill
305 #define PadnamelistMAXNAMED(pnl) (pnl)->xpadnl_max_named
306 #define PadnamelistREFCNT(pnl) (pnl)->xpadnl_refcnt
307 #define PadnamelistREFCNT_dec(pnl) Perl_padnamelist_free(aTHX_ pnl)
309 #define PadARRAY(pad) AvARRAY(pad)
310 #define PadMAX(pad) AvFILLp(pad)
312 #define PadnamePV(pn) (pn)->xpadn_pv
313 #define PadnameLEN(pn) (pn)->xpadn_len
314 #define PadnameUTF8(pn) 1
315 #define PadnameSV(pn) \
316 newSVpvn_flags(PadnamePV(pn), PadnameLEN(pn), SVs_TEMP|SVf_UTF8)
317 #define PadnameFLAGS(pn) (pn)->xpadn_flags
318 #define PadnameIsOUR(pn) (!!(pn)->xpadn_ourstash)
319 #define PadnameOURSTASH(pn) (pn)->xpadn_ourstash
320 #define PadnameTYPE(pn) (pn)->xpadn_type_u.xpadn_typestash
321 #define PadnamePROTOCV(pn) (pn)->xpadn_type_u.xpadn_protocv
322 #define PadnameREFCNT(pn) (pn)->xpadn_refcnt
323 #define PadnameREFCNT_dec(pn) Perl_padname_free(aTHX_ pn)
324 #define PadnameOURSTASH_set(pn,s) (PadnameOURSTASH(pn) = (s))
325 #define PadnameTYPE_set(pn,s) (PadnameTYPE(pn) = (s))
326 #define PadnameOUTER(pn) (PadnameFLAGS(pn) & PADNAMEt_OUTER)
327 #define PadnameIsSTATE(pn) (PadnameFLAGS(pn) & PADNAMEt_STATE)
328 #define PadnameLVALUE(pn) (PadnameFLAGS(pn) & PADNAMEt_LVALUE)
330 #define PadnameLVALUE_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_LVALUE)
331 #define PadnameIsSTATE_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_STATE)
333 #define PADNAMEt_OUTER 1 /* outer lexical var */
334 #define PADNAMEt_STATE 2 /* state var */
335 #define PADNAMEt_LVALUE 4 /* used as lvalue */
336 #define PADNAMEt_TYPED 8 /* for B; unused by core */
337 #define PADNAMEt_OUR 16 /* for B; unused by core */
339 /* backward compatibility */
340 #define SvPAD_STATE PadnameIsSTATE
341 #define SvPAD_TYPED(pn) (!!PadnameTYPE(pn))
342 #define SvPAD_OUR(pn) (!!PadnameOURSTASH(pn))
343 #define SvPAD_STATE_on PadnameIsSTATE_on
344 #define SvPAD_TYPED_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_TYPED)
345 #define SvPAD_OUR_on(pn) (PadnameFLAGS(pn) |= PADNAMEt_OUR)
346 #define SvOURSTASH PadnameOURSTASH
347 #define SvOURSTASH_set PadnameOURSTASH_set
348 #define SVpad_STATE PADNAMEt_STATE
349 #define SVpad_TYPED PADNAMEt_TYPED
350 #define SVpad_OUR PADNAMEt_OUR
352 #ifdef DEBUGGING
353 # define PAD_SV(po) pad_sv(po)
354 # define PAD_SETSV(po,sv) pad_setsv(po,sv)
355 #else
356 # define PAD_SV(po) (PL_curpad[po])
357 # define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
358 #endif
360 #define PAD_SVl(po) (PL_curpad[po])
362 #define PAD_BASE_SV(padlist, po) \
363 (PadlistARRAY(padlist)[1]) \
364 ? AvARRAY(MUTABLE_AV((PadlistARRAY(padlist)[1])))[po] \
365 : NULL;
368 #define PAD_SET_CUR_NOSAVE(padlist,nth) \
369 PL_comppad = (PAD*) (PadlistARRAY(padlist)[nth]); \
370 PL_curpad = AvARRAY(PL_comppad); \
371 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
372 "Pad 0x%" UVxf "[0x%" UVxf "] set_cur depth=%d\n", \
373 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));
376 #define PAD_SET_CUR(padlist,nth) \
377 SAVECOMPPAD(); \
378 PAD_SET_CUR_NOSAVE(padlist,nth);
381 #define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
382 PL_comppad = NULL; PL_curpad = NULL; \
383 DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
385 #define PAD_SAVE_LOCAL(opad,npad) \
386 opad = PL_comppad; \
387 PL_comppad = (npad); \
388 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
389 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
390 "Pad 0x%" UVxf "[0x%" UVxf "] save_local\n", \
391 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
393 #define PAD_RESTORE_LOCAL(opad) \
394 assert(!opad || !SvIS_FREED(opad)); \
395 PL_comppad = opad; \
396 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
397 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
398 "Pad 0x%" UVxf "[0x%" UVxf "] restore_local\n", \
399 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
402 /*
403 =for apidoc m|void|CX_CURPAD_SAVE|struct context
404 Save the current pad in the given context block structure.
406 =for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po
407 Access the SV at offset C<po> in the saved current pad in the given
408 context block structure (can be used as an lvalue).
410 =cut
411 */
413 #define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
414 #define CX_CURPAD_SV(block,po) (AvARRAY(MUTABLE_AV(((block).oldcomppad)))[po])
417 /*
418 =for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po
419 Return the flags for the current compiling pad name
420 at offset C<po>. Assumes a valid slot entry.
422 =for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po
423 Return the name of the current compiling pad name
424 at offset C<po>. Assumes a valid slot entry.
426 =for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po
427 Return the type (stash) of the current compiling pad name at offset
428 C<po>. Must be a valid name. Returns null if not typed.
430 =for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po
431 Return the stash associated with an C<our> variable.
432 Assumes the slot entry is a valid C<our> lexical.
434 =for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po
435 The generation number of the name at offset C<po> in the current
436 compiling pad (lvalue).
438 =for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen
439 Sets the generation number of the name at offset C<po> in the current
440 ling pad (lvalue) to C<gen>.
441 =cut
443 */
445 #define PAD_COMPNAME(po) PAD_COMPNAME_SV(po)
446 #define PAD_COMPNAME_SV(po) (PadnamelistARRAY(PL_comppad_name)[(po)])
447 #define PAD_COMPNAME_FLAGS(po) PadnameFLAGS(PAD_COMPNAME(po))
448 #define PAD_COMPNAME_FLAGS_isOUR(po) SvPAD_OUR(PAD_COMPNAME_SV(po))
449 #define PAD_COMPNAME_PV(po) PadnamePV(PAD_COMPNAME(po))
451 #define PAD_COMPNAME_TYPE(po) PadnameTYPE(PAD_COMPNAME(po))
453 #define PAD_COMPNAME_OURSTASH(po) \
454 (SvOURSTASH(PAD_COMPNAME_SV(po)))
456 #define PAD_COMPNAME_GEN(po) \
457 ((STRLEN)PadnamelistARRAY(PL_comppad_name)[po]->xpadn_gen)
459 #define PAD_COMPNAME_GEN_set(po, gen) \
460 (PadnamelistARRAY(PL_comppad_name)[po]->xpadn_gen = (gen))
463 /*
464 =for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl|CLONE_PARAMS* param
465 Clone the state variables associated with running and compiling pads.
467 =cut
468 */
470 /* NB - we set PL_comppad to null unless it points at a value that
471 * has already been dup'ed, ie it points to part of an active padlist.
472 * Otherwise PL_comppad ends up being a leaked scalar in code like
473 * the following:
474 * threads->create(sub { threads->create(sub {...} ) } );
475 * where the second thread dups the outer sub's comppad but not the
476 * sub's CV or padlist. */
478 #define PAD_CLONE_VARS(proto_perl, param) \
479 PL_comppad = av_dup(proto_perl->Icomppad, param); \
480 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
481 PL_comppad_name = \
482 padnamelist_dup(proto_perl->Icomppad_name, param); \
483 PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \
484 PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \
485 PL_min_intro_pending = proto_perl->Imin_intro_pending; \
486 PL_max_intro_pending = proto_perl->Imax_intro_pending; \
487 PL_padix = proto_perl->Ipadix; \
488 PL_padix_floor = proto_perl->Ipadix_floor; \
489 PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \
490 PL_cop_seqmax = proto_perl->Icop_seqmax;
492 /*
493 =for apidoc Am|PADOFFSET|pad_add_name_pvs|"name"|U32 flags|HV *typestash|HV *ourstash
495 Exactly like L</pad_add_name_pvn>, but takes a literal string
496 instead of a string/length pair.
498 =cut
499 */
501 #define pad_add_name_pvs(name,flags,typestash,ourstash) \
502 Perl_pad_add_name_pvn(aTHX_ STR_WITH_LEN(name), flags, typestash, ourstash)
504 /*
505 =for apidoc Am|PADOFFSET|pad_findmy_pvs|"name"|U32 flags
507 Exactly like L</pad_findmy_pvn>, but takes a literal string
508 instead of a string/length pair.
510 =cut
511 */
513 #define pad_findmy_pvs(name,flags) \
514 Perl_pad_findmy_pvn(aTHX_ STR_WITH_LEN(name), flags)
516 /*
517 * ex: set ts=8 sts=4 sw=4 et:
518 */