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pad.h: PADNAME_SV
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1/* pad.h
2 *
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3 * Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008,
4 * 2009, 2010, 2011 by Larry Wall and others
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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 */
13
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14/*
15=head1 Pad Data Structures
16*/
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17
18
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19/* offsets within a pad */
20
21#if PTRSIZE == 4
22typedef U32TYPE PADOFFSET;
23#else
24# if PTRSIZE == 8
25typedef U64TYPE PADOFFSET;
26# endif
27#endif
28#define NOT_IN_PAD ((PADOFFSET) -1)
809abb02 29
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30
31struct padlist {
32 SSize_t xpadl_max; /* max index for which array has space */
33 PAD ** xpadl_alloc; /* pointer to beginning of array of AVs */
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34 U32 xpadl_id; /* Semi-unique ID, shared between clones */
35 U32 xpadl_outid; /* ID of outer pad */
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36};
37
38
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39/* a value that PL_cop_seqmax is guaranteed never to be,
40 * flagging that a lexical is being introduced, or has not yet left scope
41 */
42#define PERL_PADSEQ_INTRO U32_MAX
43
44
7948fc08 45/* B.xs needs these for the benefit of B::Deparse */
809abb02 46/* Low range end is exclusive (valid from the cop seq after this one) */
809abb02 47/* High range end is inclusive (valid up to this cop seq) */
809abb02 48
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49#if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN)
50# define COP_SEQ_RANGE_LOW(sv) \
b1bc3f34 51 (({ const SV *const _sv_cop_seq_range_low = (const SV *) (sv); \
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52 assert(SvTYPE(_sv_cop_seq_range_low) == SVt_NV \
53 || SvTYPE(_sv_cop_seq_range_low) >= SVt_PVNV); \
54 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVAV); \
55 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVHV); \
56 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVCV); \
57 assert(SvTYPE(_sv_cop_seq_range_low) != SVt_PVFM); \
58 assert(!isGV_with_GP(_sv_cop_seq_range_low)); \
b1bc3f34 59 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_low)))->xnv_u.xpad_cop_seq.xlow; \
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60 }))
61# define COP_SEQ_RANGE_HIGH(sv) \
b1bc3f34 62 (({ const SV *const _sv_cop_seq_range_high = (const SV *) (sv); \
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63 assert(SvTYPE(_sv_cop_seq_range_high) == SVt_NV \
64 || SvTYPE(_sv_cop_seq_range_high) >= SVt_PVNV); \
65 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVAV); \
66 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVHV); \
67 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVCV); \
68 assert(SvTYPE(_sv_cop_seq_range_high) != SVt_PVFM); \
69 assert(!isGV_with_GP(_sv_cop_seq_range_high)); \
b1bc3f34 70 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_high)))->xnv_u.xpad_cop_seq.xhigh; \
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71 }))
72# define PARENT_PAD_INDEX(sv) \
b1bc3f34 73 (({ const SV *const _sv_parent_pad_index = (const SV *) (sv); \
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74 assert(SvTYPE(_sv_parent_pad_index) == SVt_NV \
75 || SvTYPE(_sv_parent_pad_index) >= SVt_PVNV); \
76 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVAV); \
77 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVHV); \
78 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVCV); \
79 assert(SvTYPE(_sv_parent_pad_index) != SVt_PVFM); \
80 assert(!isGV_with_GP(_sv_parent_pad_index)); \
b1bc3f34 81 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_pad_index)))->xnv_u.xpad_cop_seq.xlow; \
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82 }))
83# define PARENT_FAKELEX_FLAGS(sv) \
b1bc3f34 84 (({ const SV *const _sv_parent_fakelex_flags = (const SV *) (sv); \
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85 assert(SvTYPE(_sv_parent_fakelex_flags) == SVt_NV \
86 || SvTYPE(_sv_parent_fakelex_flags) >= SVt_PVNV); \
87 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVAV); \
88 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVHV); \
89 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVCV); \
90 assert(SvTYPE(_sv_parent_fakelex_flags) != SVt_PVFM); \
91 assert(!isGV_with_GP(_sv_parent_fakelex_flags)); \
b1bc3f34 92 ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_fakelex_flags)))->xnv_u.xpad_cop_seq.xhigh; \
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93 }))
94#else
95# define COP_SEQ_RANGE_LOW(sv) \
96 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
97# define COP_SEQ_RANGE_HIGH(sv) \
98 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
99
100
101# define PARENT_PAD_INDEX(sv) \
102 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xlow))
103# define PARENT_FAKELEX_FLAGS(sv) \
104 (0 + (((XPVNV*) SvANY(sv))->xnv_u.xpad_cop_seq.xhigh))
105#endif
dd2155a4 106
6c5e080d 107/* Flags set in the SvIVX field of FAKE namesvs */
7948fc08 108
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109#define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */
110#define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */
111
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112/* flags for the pad_new() function */
113
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114#define padnew_CLONE 1 /* this pad is for a cloned CV */
115#define padnew_SAVE 2 /* save old globals */
116#define padnew_SAVESUB 4 /* also save extra stuff for start of sub */
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117
118/* values for the pad_tidy() function */
119
120typedef enum {
121 padtidy_SUB, /* tidy up a pad for a sub, */
122 padtidy_SUBCLONE, /* a cloned sub, */
123 padtidy_FORMAT /* or a format */
124} padtidy_type;
125
9f6ec8dd 126/* flags for pad_add_name_pvn. */
35f82371 127
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128#define padadd_OUR 0x01 /* our declaration. */
129#define padadd_STATE 0x02 /* state declaration. */
130#define padadd_NO_DUP_CHECK 0x04 /* skip warning on dups. */
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131#define padadd_STALEOK 0x08 /* allow stale lexical in active
132 * sub, but only one level up */
9f6ec8dd 133#define padadd_UTF8_NAME SVf_UTF8 /* name is UTF-8 encoded. */
35f82371 134
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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 */
dd2155a4 138
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139#ifndef PERL_MAD
140# define pad_peg(label)
141#endif
142
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143#ifdef DEBUGGING
144# define ASSERT_CURPAD_LEGAL(label) \
1dba731d 145 pad_peg(label); \
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146 if (PL_comppad ? (AvARRAY(PL_comppad) != PL_curpad) : (PL_curpad != 0)) \
147 Perl_croak(aTHX_ "panic: illegal pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
148 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
149
150
151# define ASSERT_CURPAD_ACTIVE(label) \
1dba731d 152 pad_peg(label); \
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153 if (!PL_comppad || (AvARRAY(PL_comppad) != PL_curpad)) \
154 Perl_croak(aTHX_ "panic: invalid pad in %s: 0x%"UVxf"[0x%"UVxf"]",\
155 label, PTR2UV(PL_comppad), PTR2UV(PL_curpad));
156#else
157# define ASSERT_CURPAD_LEGAL(label)
158# define ASSERT_CURPAD_ACTIVE(label)
159#endif
160
161
162
163/* Note: the following three macros are actually defined in scope.h, but
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164 * they are documented here for completeness, since they directly or
165 * indirectly affect pads.
166
167=for apidoc m|void|SAVEPADSV |PADOFFSET po
168Save a pad slot (used to restore after an iteration)
169
f3548bdc 170XXX DAPM it would make more sense to make the arg a PADOFFSET
dd2155a4 171=for apidoc m|void|SAVECLEARSV |SV **svp
eeb8d49e 172Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my')
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173
174=for apidoc m|void|SAVECOMPPAD
175save PL_comppad and PL_curpad
176
dd2155a4 177
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178=for apidoc Amx|PAD **|PADLIST_ARRAY|PADLIST padlist
179The C array of a padlist, containing the pads. Only subscript it with
180numbers >= 1, as the 0th entry is not guaranteed to remain usable.
dd2155a4 181
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182=for apidoc Amx|SSize_t|PADLIST_MAX|PADLIST padlist
183The index of the last pad in the padlist.
184
185=for apidoc Amx|PADNAMELIST *|PADLIST_NAMES|PADLIST padlist
186The names associated with pad entries.
187
188=for apidoc Amx|PADNAME **|PADLIST_NAMESARRAY|PADLIST padlist
189The C array of pad names.
190
191=for apidoc Amx|SSize_t|PADLIST_NAMESMAX|PADLIST padlist
192The index of the last pad name.
193
194=for apidoc Amx|U32|PADLIST_REFCNT|PADLIST padlist
195The reference count of the padlist. Currently this is always 1.
196
197=for apidoc Amx|PADNAME **|PADNAMELIST_ARRAY|PADNAMELIST pnl
198The C array of pad names.
199
200=for apidoc Amx|SSize_t|PADNAMELIST_MAX|PADNAMELIST pnl
201The index of the last pad name.
202
203=for apidoc Amx|SV **|PAD_ARRAY|PAD pad
204The C array of pad entries.
205
206=for apidoc Amx|SSize_t|PAD_MAX|PAD pad
207The index of the last pad entry.
208
209=for apidoc Amx|char *|PADNAME_PV|PADNAME pn
210The name stored in the pad name struct.
211
212=for apidoc Amx|STRLEN|PADNAME_LEN|PADNAME pn
213The length of the name.
214
215=for apidoc Amx|bool|PADNAME_UTF8|PADNAME pn
216Whether PADNAME_PV is in UTF8.
217
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218=for apidoc Amx|SV *|PADNAME_SV|PADNAME pn
219Returns the pad name as an SV. This is currently just C<pn>. It will
220begin returning a new mortal SV if pad names ever stop being SVs.
221
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222=for apidoc m|bool|PADNAME_isOUR|PADNAME pn
223Whether this is an "our" variable.
224
225=for apidoc m|HV *|PADNAME_OURSTASH
226The stash in which this "our" variable was declared.
227
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228=for apidoc m|bool|PADNAME_OUTER|PADNAME pn
229Whether this entry belongs to an outer pad.
230
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231=for apidoc m|HV *|PADNAME_TYPE|PADNAME pn
232The stash associated with a typed lexical. This returns the %Foo:: hash
233for C<my Foo $bar>.
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234
235
236=for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv
237Set the slot at offset C<po> in the current pad to C<sv>
238
239=for apidoc m|void|PAD_SV |PADOFFSET po
240Get the value at offset C<po> in the current pad
241
242=for apidoc m|SV *|PAD_SVl |PADOFFSET po
243Lightweight and lvalue version of C<PAD_SV>.
244Get or set the value at offset C<po> in the current pad.
245Unlike C<PAD_SV>, does not print diagnostics with -DX.
246For internal use only.
247
248=for apidoc m|SV *|PAD_BASE_SV |PADLIST padlist|PADOFFSET po
249Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
250
251=for apidoc m|void|PAD_SET_CUR |PADLIST padlist|I32 n
252Set the current pad to be pad C<n> in the padlist, saving
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253the previous current pad. NB currently this macro expands to a string too
254long for some compilers, so it's best to replace it with
255
256 SAVECOMPPAD();
257 PAD_SET_CUR_NOSAVE(padlist,n);
258
dd2155a4 259
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260=for apidoc m|void|PAD_SET_CUR_NOSAVE |PADLIST padlist|I32 n
261like PAD_SET_CUR, but without the save
262
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263=for apidoc m|void|PAD_SAVE_SETNULLPAD
264Save the current pad then set it to null.
265
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266=for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad
267Save the current pad to the local variable opad, then make the
268current pad equal to npad
269
270=for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad
271Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
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272
273=cut
274*/
275
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276#define PADLIST_ARRAY(pl) (pl)->xpadl_alloc
277#define PADLIST_MAX(pl) (pl)->xpadl_max
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278#define PADLIST_NAMES(pl) (*PADLIST_ARRAY(pl))
279#define PADLIST_NAMESARRAY(pl) PADNAMELIST_ARRAY(PADLIST_NAMES(pl))
280#define PADLIST_NAMESMAX(pl) PADNAMELIST_MAX(PADLIST_NAMES(pl))
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281#define PADLIST_REFCNT(pl) 1 /* reserved for future use */
282
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283#define PADNAMELIST_ARRAY(pnl) AvARRAY(pnl)
284#define PADNAMELIST_MAX(pnl) AvFILLp(pnl)
285
286#define PAD_ARRAY(pad) AvARRAY(pad)
287#define PAD_MAX(pad) AvFILLp(pad)
288
289#define PADNAME_PV(pn) SvPV_nolen(pn)
290#define PADNAME_LEN(pn) SvCUR(pn)
291#define PADNAME_UTF8(pn) !!SvUTF8(pn)
97dad6bd 292#define PADNAME_SV(pn) pn
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293#define PADNAME_isOUR(pn) !!SvPAD_OUR(pn)
294#define PADNAME_OURSTASH SvOURSTASH(pn)
c44737a2 295#define PADNAME_OUTER !!SvFAKE(pn)
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296#define PADNAME_TYPE(pn) (SvPAD_TYPED(pn) ? SvSTASH(pn) : NULL)
297
298
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299#ifdef DEBUGGING
300# define PAD_SV(po) pad_sv(po)
301# define PAD_SETSV(po,sv) pad_setsv(po,sv)
302#else
303# define PAD_SV(po) (PL_curpad[po])
304# define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
305#endif
306
307#define PAD_SVl(po) (PL_curpad[po])
308
309#define PAD_BASE_SV(padlist, po) \
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310 (PADLIST_ARRAY(padlist)[1]) \
311 ? AvARRAY(MUTABLE_AV((PADLIST_ARRAY(padlist)[1])))[po] \
312 : NULL;
7948fc08 313
dd2155a4 314
de5e01c2 315#define PAD_SET_CUR_NOSAVE(padlist,nth) \
7261499d 316 PL_comppad = (PAD*) (PADLIST_ARRAY(padlist)[nth]); \
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317 PL_curpad = AvARRAY(PL_comppad); \
318 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
319 "Pad 0x%"UVxf"[0x%"UVxf"] set_cur depth=%d\n", \
de5e01c2 320 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));
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321
322
de5e01c2 323#define PAD_SET_CUR(padlist,nth) \
4e380990 324 SAVECOMPPAD(); \
de5e01c2 325 PAD_SET_CUR_NOSAVE(padlist,nth);
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326
327
f3548bdc 328#define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
4608196e 329 PL_comppad = NULL; PL_curpad = NULL; \
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330 DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
331
332#define PAD_SAVE_LOCAL(opad,npad) \
333 opad = PL_comppad; \
334 PL_comppad = (npad); \
4608196e 335 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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336 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
337 "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n", \
338 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
339
340#define PAD_RESTORE_LOCAL(opad) \
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341 assert(!opad || !SvIS_FREED(opad)); \
342 PL_comppad = opad; \
4608196e 343 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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344 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
345 "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n", \
346 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
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347
348
349/*
350=for apidoc m|void|CX_CURPAD_SAVE|struct context
351Save the current pad in the given context block structure.
352
f3548bdc 353=for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po
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354Access the SV at offset po in the saved current pad in the given
355context block structure (can be used as an lvalue).
356
357=cut
358*/
359
f3548bdc 360#define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
a062e10d 361#define CX_CURPAD_SV(block,po) (AvARRAY(MUTABLE_AV(((block).oldcomppad)))[po])
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362
363
364/*
365=for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po
366Return the flags for the current compiling pad name
367at offset C<po>. Assumes a valid slot entry.
368
369=for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po
370Return the name of the current compiling pad name
371at offset C<po>. Assumes a valid slot entry.
372
373=for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po
374Return the type (stash) of the current compiling pad name at offset
375C<po>. Must be a valid name. Returns null if not typed.
376
377=for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po
378Return the stash associated with an C<our> variable.
379Assumes the slot entry is a valid C<our> lexical.
380
381=for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po
382The generation number of the name at offset C<po> in the current
931b58fb 383compiling pad (lvalue). Note that C<SvUVX> is hijacked for this purpose.
dd2155a4 384
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385=for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen
386Sets the generation number of the name at offset C<po> in the current
931b58fb 387ling pad (lvalue) to C<gen>. Note that C<SvUV_set> is hijacked for this purpose.
b162af07 388
dd2155a4 389=cut
b162af07 390
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391*/
392
35e035cc 393#define PAD_COMPNAME(po) PAD_COMPNAME_SV(po)
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394#define PAD_COMPNAME_SV(po) (*av_fetch(PL_comppad_name, (po), FALSE))
395#define PAD_COMPNAME_FLAGS(po) SvFLAGS(PAD_COMPNAME_SV(po))
1979170b 396#define PAD_COMPNAME_FLAGS_isOUR(po) SvPAD_OUR(PAD_COMPNAME_SV(po))
f8503592 397#define PAD_COMPNAME_PV(po) SvPV_nolen(PAD_COMPNAME_SV(po))
dd2155a4 398
b21dc031 399#define PAD_COMPNAME_TYPE(po) pad_compname_type(po)
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400
401#define PAD_COMPNAME_OURSTASH(po) \
73d95100 402 (SvOURSTASH(PAD_COMPNAME_SV(po)))
dd2155a4 403
931b58fb 404#define PAD_COMPNAME_GEN(po) ((STRLEN)SvUVX(AvARRAY(PL_comppad_name)[po]))
dd2155a4 405
931b58fb 406#define PAD_COMPNAME_GEN_set(po, gen) SvUV_set(AvARRAY(PL_comppad_name)[po], (UV)(gen))
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407
408
409/*
d77cdebf 410=for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl|CLONE_PARAMS* param
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411Clone the state variables associated with running and compiling pads.
412
413=cut
414*/
415
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416/* NB - we set PL_comppad to null unless it points at a value that
417 * has already been dup'ed, ie it points to part of an active padlist.
418 * Otherwise PL_comppad ends up being a leaked scalar in code like
419 * the following:
420 * threads->create(sub { threads->create(sub {...} ) } );
421 * where the second thread dups the outer sub's comppad but not the
422 * sub's CV or padlist. */
f3548bdc 423
dd2155a4 424#define PAD_CLONE_VARS(proto_perl, param) \
253649d9 425 PL_comppad = av_dup(proto_perl->Icomppad, param); \
4608196e 426 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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427 PL_comppad_name = av_dup(proto_perl->Icomppad_name, param); \
428 PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \
429 PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \
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430 PL_min_intro_pending = proto_perl->Imin_intro_pending; \
431 PL_max_intro_pending = proto_perl->Imax_intro_pending; \
432 PL_padix = proto_perl->Ipadix; \
433 PL_padix_floor = proto_perl->Ipadix_floor; \
434 PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \
435 PL_cop_seqmax = proto_perl->Icop_seqmax;
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436
437/*
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438=for apidoc Am|PADOFFSET|pad_add_name_pvs|const char *name|U32 flags|HV *typestash|HV *ourstash
439
440Exactly like L</pad_add_name_pvn>, but takes a literal string instead
441of a string/length pair.
442
443=cut
444*/
445
446#define pad_add_name_pvs(name,flags,typestash,ourstash) \
447 Perl_pad_add_name_pvn(aTHX_ STR_WITH_LEN(name), flags, typestash, ourstash)
448
449/*
450=for apidoc Am|PADOFFSET|pad_findmy_pvs|const char *name|U32 flags
451
452Exactly like L</pad_findmy_pvn>, but takes a literal string instead
453of a string/length pair.
454
455=cut
456*/
457
458#define pad_findmy_pvs(name,flags) \
459 Perl_pad_findmy_pvn(aTHX_ STR_WITH_LEN(name), flags)
460
461/*
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462 * Local variables:
463 * c-indentation-style: bsd
464 * c-basic-offset: 4
14d04a33 465 * indent-tabs-mode: nil
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466 * End:
467 *
14d04a33 468 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 469 */