3 * Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008,
4 * 2009, 2010, 2011 by Larry Wall and others
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.
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.
15 =head1 Pad Data Structures
19 /* a padlist is currently just an AV; but that might change,
20 * so hide the type. Ditto a pad. */
26 /* offsets within a pad */
29 typedef U32TYPE PADOFFSET;
32 typedef U64TYPE PADOFFSET;
35 #define NOT_IN_PAD ((PADOFFSET) -1)
37 /* a value that PL_cop_seqmax is guaranteed never to be,
38 * flagging that a lexical is being introduced, or has not yet left scope
40 #define PERL_PADSEQ_INTRO U32_MAX
43 /* B.xs needs these for the benefit of B::Deparse */
44 /* Low range end is exclusive (valid from the cop seq after this one) */
45 /* High range end is inclusive (valid up to this cop seq) */
47 #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
48 # define COP_SEQ_RANGE_LOW(sv) \
49 (({ const SV *const _sv_cop_seq_range_low = (const SV *) (sv); \
50 assert(SvTYPE(_sv_cop_seq_range_low) == SVt_NV \
51 || SvTYPE(_sv_cop_seq_range_low) >= SVt_PVNV); \
52 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVAV); \
53 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVHV); \
54 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVCV); \
55 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVFM); \
56 assert(!isGV_with_GP(_sv_cop_seq_range_low)); \
57 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_low)))->xnv_u.xpad_cop_seq.xlow; \
59 # define COP_SEQ_RANGE_HIGH(sv) \
60 (({ const SV *const _sv_cop_seq_range_high = (const SV *) (sv); \
61 assert(SvTYPE(_sv_cop_seq_range_high) == SVt_NV \
62 || SvTYPE(_sv_cop_seq_range_high) >= SVt_PVNV); \
63 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVAV); \
64 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVHV); \
65 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVCV); \
66 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVFM); \
67 assert(!isGV_with_GP(_sv_cop_seq_range_high)); \
68 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_high)))->xnv_u.xpad_cop_seq.xhigh; \
70 # define PARENT_PAD_INDEX(sv) \
71 (({ const SV *const _sv_parent_pad_index = (const SV *) (sv); \
72 assert(SvTYPE(_sv_parent_pad_index) == SVt_NV \
73 || SvTYPE(_sv_parent_pad_index) >= SVt_PVNV); \
74 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVAV); \
75 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVHV); \
76 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVCV); \
77 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVFM); \
78 assert(!isGV_with_GP(_sv_parent_pad_index)); \
79 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_pad_index)))->xnv_u.xpad_cop_seq.xlow; \
81 # define PARENT_FAKELEX_FLAGS(sv) \
82 (({ const SV *const _sv_parent_fakelex_flags = (const SV *) (sv); \
83 assert(SvTYPE(_sv_parent_fakelex_flags) == SVt_NV \
84 || SvTYPE(_sv_parent_fakelex_flags) >= SVt_PVNV); \
85 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVAV); \
86 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVHV); \
87 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVCV); \
88 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVFM); \
89 assert(!isGV_with_GP(_sv_parent_fakelex_flags)); \
90 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_fakelex_flags)))->xnv_u.xpad_cop_seq.xhigh; \
93 # define COP_SEQ_RANGE_LOW(sv) \
94 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
95 # define COP_SEQ_RANGE_HIGH(sv) \
96 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
99 # define PARENT_PAD_INDEX(sv) \
100 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
101 # define PARENT_FAKELEX_FLAGS(sv) \
102 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
105 /* Flags set in the SvIVX field of FAKE namesvs */
107 #define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
108 #define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
110 /* flags for the pad_new() function */
112 #define padnew_CLONE 1 /* this pad is for a cloned CV */
113 #define padnew_SAVE 2 /* save old globals */
114 #define padnew_SAVESUB 4 /* also save extra stuff for start of sub */
116 /* values for the pad_tidy() function */
119 padtidy_SUB, /* tidy up a pad for a sub, */
120 padtidy_SUBCLONE, /* a cloned sub, */
121 padtidy_FORMAT /* or a format */
124 /* flags for pad_add_name_pvn. */
126 #define padadd_OUR 0x01 /* our declaration. */
127 #define padadd_STATE 0x02 /* state declaration. */
128 #define padadd_NO_DUP_CHECK 0x04 /* skip warning on dups. */
129 #define padadd_STALEOK 0x08 /* allow stale lexical in active
130 * sub, but only one level up */
131 #define padadd_UTF8_NAME SVf_UTF8 /* name is UTF-8 encoded. */
133 /* ASSERT_CURPAD_LEGAL and ASSERT_CURPAD_ACTIVE respectively determine
134 * whether PL_comppad and PL_curpad are consistent and whether they have
138 # define pad_peg(label)
142 # define ASSERT_CURPAD_LEGAL(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) \
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));
155 # define ASSERT_CURPAD_LEGAL(label)
156 # define ASSERT_CURPAD_ACTIVE(label)
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 XXX DAPM it would make more sense to make the arg a PADOFFSET
169 =for apidoc m|void|SAVECLEARSV |SV **svp
170 Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')
172 =for apidoc m|void|SAVECOMPPAD
173 save PL_comppad and PL_curpad
179 =for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv
180 Set the slot at offset C<po> in the current pad to C<sv>
182 =for apidoc m|void|PAD_SV |PADOFFSET po
183 Get the value at offset C<po> in the current pad
185 =for apidoc m|SV *|PAD_SVl |PADOFFSET po
186 Lightweight and lvalue version of C<PAD_SV>.
187 Get or set the value at offset C<po> in the current pad.
188 Unlike C<PAD_SV>, does not print diagnostics with -DX.
189 For internal use only.
191 =for apidoc m|SV *|PAD_BASE_SV |PADLIST padlist|PADOFFSET po
192 Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
194 =for apidoc m|void|PAD_SET_CUR |PADLIST padlist|I32 n
195 Set the current pad to be pad C<n> in the padlist, saving
196 the previous current pad. NB currently this macro expands to a string too
197 long for some compilers, so it's best to replace it with
200 PAD_SET_CUR_NOSAVE(padlist,n);
203 =for apidoc m|void|PAD_SET_CUR_NOSAVE |PADLIST padlist|I32 n
204 like PAD_SET_CUR, but without the save
206 =for apidoc m|void|PAD_SAVE_SETNULLPAD
207 Save the current pad then set it to null.
209 =for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad
210 Save the current pad to the local variable opad, then make the
211 current pad equal to npad
213 =for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad
214 Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
220 # define PAD_SV(po) pad_sv(po)
221 # define PAD_SETSV(po,sv) pad_setsv(po,sv)
223 # define PAD_SV(po) (PL_curpad[po])
224 # define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
227 #define PAD_SVl(po) (PL_curpad[po])
229 #define PAD_BASE_SV(padlist, po) \
230 (AvARRAY(padlist)[1]) \
231 ? AvARRAY(MUTABLE_AV((AvARRAY(padlist)[1])))[po] : NULL;
234 #define PAD_SET_CUR_NOSAVE(padlist,nth) \
235 PL_comppad = (PAD*) (AvARRAY(padlist)[nth]); \
236 PL_curpad = AvARRAY(PL_comppad); \
237 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
238 "Pad 0x%"UVxf"[0x%"UVxf"] set_cur depth=%d\n", \
239 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));
242 #define PAD_SET_CUR(padlist,nth) \
244 PAD_SET_CUR_NOSAVE(padlist,nth);
247 #define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
248 PL_comppad = NULL; PL_curpad = NULL; \
249 DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
251 #define PAD_SAVE_LOCAL(opad,npad) \
253 PL_comppad = (npad); \
254 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
255 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
256 "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n", \
257 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
259 #define PAD_RESTORE_LOCAL(opad) \
260 assert(!opad || !SvIS_FREED(opad)); \
262 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
263 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
264 "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n", \
265 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
269 =for apidoc m|void|CX_CURPAD_SAVE|struct context
270 Save the current pad in the given context block structure.
272 =for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po
273 Access the SV at offset po in the saved current pad in the given
274 context block structure (can be used as an lvalue).
279 #define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
280 #define CX_CURPAD_SV(block,po) (AvARRAY(MUTABLE_AV(((block).oldcomppad)))[po])
284 =for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po
285 Return the flags for the current compiling pad name
286 at offset C<po>. Assumes a valid slot entry.
288 =for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po
289 Return the name of the current compiling pad name
290 at offset C<po>. Assumes a valid slot entry.
292 =for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po
293 Return the type (stash) of the current compiling pad name at offset
294 C<po>. Must be a valid name. Returns null if not typed.
296 =for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po
297 Return the stash associated with an C<our> variable.
298 Assumes the slot entry is a valid C<our> lexical.
300 =for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po
301 The generation number of the name at offset C<po> in the current
302 compiling pad (lvalue). Note that C<SvUVX> is hijacked for this purpose.
304 =for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen
305 Sets the generation number of the name at offset C<po> in the current
306 ling pad (lvalue) to C<gen>. Note that C<SvUV_set> is hijacked for this purpose.
312 #define PAD_COMPNAME_SV(po) (*av_fetch(PL_comppad_name, (po), FALSE))
313 #define PAD_COMPNAME_FLAGS(po) SvFLAGS(PAD_COMPNAME_SV(po))
314 #define PAD_COMPNAME_FLAGS_isOUR(po) SvPAD_OUR(PAD_COMPNAME_SV(po))
315 #define PAD_COMPNAME_PV(po) SvPV_nolen(PAD_COMPNAME_SV(po))
317 #define PAD_COMPNAME_TYPE(po) pad_compname_type(po)
319 #define PAD_COMPNAME_OURSTASH(po) \
320 (SvOURSTASH(PAD_COMPNAME_SV(po)))
322 #define PAD_COMPNAME_GEN(po) ((STRLEN)SvUVX(AvARRAY(PL_comppad_name)[po]))
324 #define PAD_COMPNAME_GEN_set(po, gen) SvUV_set(AvARRAY(PL_comppad_name)[po], (UV)(gen))
328 =for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl|CLONE_PARAMS* param
329 Clone the state variables associated with running and compiling pads.
334 /* NB - we set PL_comppad to null unless it points at a value that
335 * has already been dup'ed, ie it points to part of an active padlist.
336 * Otherwise PL_comppad ends up being a leaked scalar in code like
338 * threads->create(sub { threads->create(sub {...} ) } );
339 * where the second thread dups the outer sub's comppad but not the
340 * sub's CV or padlist. */
342 #define PAD_CLONE_VARS(proto_perl, param) \
343 PL_comppad = av_dup(proto_perl->Icomppad, param); \
344 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
345 PL_comppad_name = av_dup(proto_perl->Icomppad_name, param); \
346 PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \
347 PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \
348 PL_min_intro_pending = proto_perl->Imin_intro_pending; \
349 PL_max_intro_pending = proto_perl->Imax_intro_pending; \
350 PL_padix = proto_perl->Ipadix; \
351 PL_padix_floor = proto_perl->Ipadix_floor; \
352 PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \
353 PL_cop_seqmax = proto_perl->Icop_seqmax;
356 =for apidoc Am|PADOFFSET|pad_add_name_pvs|const char *name|U32 flags|HV *typestash|HV *ourstash
358 Exactly like L</pad_add_name_pvn>, but takes a literal string instead
359 of a string/length pair.
364 #define pad_add_name_pvs(name,flags,typestash,ourstash) \
365 Perl_pad_add_name_pvn(aTHX_ STR_WITH_LEN(name), flags, typestash, ourstash)
368 =for apidoc Am|PADOFFSET|pad_findmy_pvs|const char *name|U32 flags
370 Exactly like L</pad_findmy_pvn>, but takes a literal string instead
371 of a string/length pair.
376 #define pad_findmy_pvs(name,flags) \
377 Perl_pad_findmy_pvn(aTHX_ STR_WITH_LEN(name), flags)
381 * c-indentation-style: bsd
383 * indent-tabs-mode: nil
386 * ex: set ts=8 sts=4 sw=4 et: