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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
9c47725a 175save PL_comppad and PL_curpad
dd2155a4 176
dd2155a4 177
86d2498c 178=for apidoc Amx|PAD **|PadlistARRAY|PADLIST padlist
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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
86d2498c 182=for apidoc Amx|SSize_t|PadlistMAX|PADLIST padlist
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183The index of the last pad in the padlist.
184
86d2498c 185=for apidoc Amx|PADNAMELIST *|PadlistNAMES|PADLIST padlist
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186The names associated with pad entries.
187
86d2498c 188=for apidoc Amx|PADNAME **|PadlistNAMESARRAY|PADLIST padlist
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189The C array of pad names.
190
86d2498c 191=for apidoc Amx|SSize_t|PadlistNAMESMAX|PADLIST padlist
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192The index of the last pad name.
193
86d2498c 194=for apidoc Amx|U32|PadlistREFCNT|PADLIST padlist
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195The reference count of the padlist. Currently this is always 1.
196
86d2498c 197=for apidoc Amx|PADNAME **|PadnamelistARRAY|PADNAMELIST pnl
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198The C array of pad names.
199
86d2498c 200=for apidoc Amx|SSize_t|PadnamelistMAX|PADNAMELIST pnl
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201The index of the last pad name.
202
86d2498c 203=for apidoc Amx|SV **|PadARRAY|PAD pad
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204The C array of pad entries.
205
86d2498c 206=for apidoc Amx|SSize_t|PadMAX|PAD pad
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207The index of the last pad entry.
208
86d2498c 209=for apidoc Amx|char *|PadnamePV|PADNAME pn
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210The name stored in the pad name struct. This returns NULL for a target or
211GV slot.
35e035cc 212
86d2498c 213=for apidoc Amx|STRLEN|PadnameLEN|PADNAME pn
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214The length of the name.
215
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216=for apidoc Amx|bool|PadnameUTF8|PADNAME pn
217Whether PadnamePV is in UTF8.
35e035cc 218
86d2498c 219=for apidoc Amx|SV *|PadnameSV|PADNAME pn
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220Returns the pad name as an SV. This is currently just C<pn>. It will
221begin returning a new mortal SV if pad names ever stop being SVs.
222
86d2498c 223=for apidoc m|bool|PadnameIsOUR|PADNAME pn
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224Whether this is an "our" variable.
225
86d2498c 226=for apidoc m|HV *|PadnameOURSTASH
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227The stash in which this "our" variable was declared.
228
86d2498c 229=for apidoc m|bool|PadnameOUTER|PADNAME pn
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230Whether this entry belongs to an outer pad.
231
3f6a9d3a 232=for apidoc m|bool|PadnameIsSTATE|PADNAME pn
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233Whether this is a "state" variable.
234
86d2498c 235=for apidoc m|HV *|PadnameTYPE|PADNAME pn
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236The stash associated with a typed lexical. This returns the %Foo:: hash
237for C<my Foo $bar>.
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238
239
240=for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv
241Set the slot at offset C<po> in the current pad to C<sv>
242
243=for apidoc m|void|PAD_SV |PADOFFSET po
244Get the value at offset C<po> in the current pad
245
246=for apidoc m|SV *|PAD_SVl |PADOFFSET po
247Lightweight and lvalue version of C<PAD_SV>.
248Get or set the value at offset C<po> in the current pad.
249Unlike C<PAD_SV>, does not print diagnostics with -DX.
250For internal use only.
251
252=for apidoc m|SV *|PAD_BASE_SV |PADLIST padlist|PADOFFSET po
253Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist
254
255=for apidoc m|void|PAD_SET_CUR |PADLIST padlist|I32 n
256Set the current pad to be pad C<n> in the padlist, saving
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257the previous current pad. NB currently this macro expands to a string too
258long for some compilers, so it's best to replace it with
259
260 SAVECOMPPAD();
261 PAD_SET_CUR_NOSAVE(padlist,n);
262
dd2155a4 263
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264=for apidoc m|void|PAD_SET_CUR_NOSAVE |PADLIST padlist|I32 n
265like PAD_SET_CUR, but without the save
266
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267=for apidoc m|void|PAD_SAVE_SETNULLPAD
268Save the current pad then set it to null.
269
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270=for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad
271Save the current pad to the local variable opad, then make the
272current pad equal to npad
273
274=for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad
275Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL()
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276
277=cut
278*/
279
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280#define PadlistARRAY(pl) (pl)->xpadl_alloc
281#define PadlistMAX(pl) (pl)->xpadl_max
282#define PadlistNAMES(pl) (*PadlistARRAY(pl))
283#define PadlistNAMESARRAY(pl) PadnamelistARRAY(PadlistNAMES(pl))
284#define PadlistNAMESMAX(pl) PadnamelistMAX(PadlistNAMES(pl))
285#define PadlistREFCNT(pl) 1 /* reserved for future use */
7261499d 286
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287#define PadnamelistARRAY(pnl) AvARRAY(pnl)
288#define PadnamelistMAX(pnl) AvFILLp(pnl)
35e035cc 289
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290#define PadARRAY(pad) AvARRAY(pad)
291#define PadMAX(pad) AvFILLp(pad)
35e035cc 292
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293#define PadnamePV(pn) (SvPOKp(pn) ? SvPVX(pn) : NULL)
294#define PadnameLEN(pn) SvCUR(pn)
295#define PadnameUTF8(pn) !!SvUTF8(pn)
296#define PadnameSV(pn) pn
297#define PadnameIsOUR(pn) !!SvPAD_OUR(pn)
298#define PadnameOURSTASH(pn) SvOURSTASH(pn)
299#define PadnameOUTER(pn) !!SvFAKE(pn)
3f6a9d3a 300#define PadnameIsSTATE(pn) !!SvPAD_STATE(pn)
86d2498c 301#define PadnameTYPE(pn) (SvPAD_TYPED(pn) ? SvSTASH(pn) : NULL)
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302
303
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304#ifdef DEBUGGING
305# define PAD_SV(po) pad_sv(po)
306# define PAD_SETSV(po,sv) pad_setsv(po,sv)
307#else
308# define PAD_SV(po) (PL_curpad[po])
309# define PAD_SETSV(po,sv) PL_curpad[po] = (sv)
310#endif
311
312#define PAD_SVl(po) (PL_curpad[po])
313
314#define PAD_BASE_SV(padlist, po) \
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315 (PadlistARRAY(padlist)[1]) \
316 ? AvARRAY(MUTABLE_AV((PadlistARRAY(padlist)[1])))[po] \
7261499d 317 : NULL;
7948fc08 318
dd2155a4 319
de5e01c2 320#define PAD_SET_CUR_NOSAVE(padlist,nth) \
86d2498c 321 PL_comppad = (PAD*) (PadlistARRAY(padlist)[nth]); \
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322 PL_curpad = AvARRAY(PL_comppad); \
323 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
324 "Pad 0x%"UVxf"[0x%"UVxf"] set_cur depth=%d\n", \
de5e01c2 325 PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth)));
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326
327
de5e01c2 328#define PAD_SET_CUR(padlist,nth) \
4e380990 329 SAVECOMPPAD(); \
de5e01c2 330 PAD_SET_CUR_NOSAVE(padlist,nth);
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331
332
f3548bdc 333#define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \
4608196e 334 PL_comppad = NULL; PL_curpad = NULL; \
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335 DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n"));
336
337#define PAD_SAVE_LOCAL(opad,npad) \
338 opad = PL_comppad; \
339 PL_comppad = (npad); \
4608196e 340 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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341 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
342 "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n", \
343 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
344
345#define PAD_RESTORE_LOCAL(opad) \
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346 assert(!opad || !SvIS_FREED(opad)); \
347 PL_comppad = opad; \
4608196e 348 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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349 DEBUG_Xv(PerlIO_printf(Perl_debug_log, \
350 "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n", \
351 PTR2UV(PL_comppad), PTR2UV(PL_curpad)));
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352
353
354/*
355=for apidoc m|void|CX_CURPAD_SAVE|struct context
356Save the current pad in the given context block structure.
357
f3548bdc 358=for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po
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359Access the SV at offset po in the saved current pad in the given
360context block structure (can be used as an lvalue).
361
362=cut
363*/
364
f3548bdc 365#define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad
a062e10d 366#define CX_CURPAD_SV(block,po) (AvARRAY(MUTABLE_AV(((block).oldcomppad)))[po])
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367
368
369/*
370=for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po
371Return the flags for the current compiling pad name
372at offset C<po>. Assumes a valid slot entry.
373
374=for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po
375Return the name of the current compiling pad name
376at offset C<po>. Assumes a valid slot entry.
377
378=for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po
379Return the type (stash) of the current compiling pad name at offset
380C<po>. Must be a valid name. Returns null if not typed.
381
382=for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po
383Return the stash associated with an C<our> variable.
384Assumes the slot entry is a valid C<our> lexical.
385
386=for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po
387The generation number of the name at offset C<po> in the current
931b58fb 388compiling pad (lvalue). Note that C<SvUVX> is hijacked for this purpose.
dd2155a4 389
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390=for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen
391Sets the generation number of the name at offset C<po> in the current
931b58fb 392ling pad (lvalue) to C<gen>. Note that C<SvUV_set> is hijacked for this purpose.
b162af07 393
dd2155a4 394=cut
b162af07 395
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396*/
397
35e035cc 398#define PAD_COMPNAME(po) PAD_COMPNAME_SV(po)
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399#define PAD_COMPNAME_SV(po) (*av_fetch(PL_comppad_name, (po), FALSE))
400#define PAD_COMPNAME_FLAGS(po) SvFLAGS(PAD_COMPNAME_SV(po))
1979170b 401#define PAD_COMPNAME_FLAGS_isOUR(po) SvPAD_OUR(PAD_COMPNAME_SV(po))
f8503592 402#define PAD_COMPNAME_PV(po) SvPV_nolen(PAD_COMPNAME_SV(po))
dd2155a4 403
b21dc031 404#define PAD_COMPNAME_TYPE(po) pad_compname_type(po)
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405
406#define PAD_COMPNAME_OURSTASH(po) \
73d95100 407 (SvOURSTASH(PAD_COMPNAME_SV(po)))
dd2155a4 408
931b58fb 409#define PAD_COMPNAME_GEN(po) ((STRLEN)SvUVX(AvARRAY(PL_comppad_name)[po]))
dd2155a4 410
931b58fb 411#define PAD_COMPNAME_GEN_set(po, gen) SvUV_set(AvARRAY(PL_comppad_name)[po], (UV)(gen))
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412
413
414/*
d77cdebf 415=for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl|CLONE_PARAMS* param
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416Clone the state variables associated with running and compiling pads.
417
418=cut
419*/
420
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421/* NB - we set PL_comppad to null unless it points at a value that
422 * has already been dup'ed, ie it points to part of an active padlist.
423 * Otherwise PL_comppad ends up being a leaked scalar in code like
424 * the following:
425 * threads->create(sub { threads->create(sub {...} ) } );
426 * where the second thread dups the outer sub's comppad but not the
427 * sub's CV or padlist. */
f3548bdc 428
dd2155a4 429#define PAD_CLONE_VARS(proto_perl, param) \
253649d9 430 PL_comppad = av_dup(proto_perl->Icomppad, param); \
4608196e 431 PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \
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432 PL_comppad_name = av_dup(proto_perl->Icomppad_name, param); \
433 PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \
434 PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \
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435 PL_min_intro_pending = proto_perl->Imin_intro_pending; \
436 PL_max_intro_pending = proto_perl->Imax_intro_pending; \
437 PL_padix = proto_perl->Ipadix; \
438 PL_padix_floor = proto_perl->Ipadix_floor; \
439 PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \
440 PL_cop_seqmax = proto_perl->Icop_seqmax;
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441
442/*
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443=for apidoc Am|PADOFFSET|pad_add_name_pvs|const char *name|U32 flags|HV *typestash|HV *ourstash
444
445Exactly like L</pad_add_name_pvn>, but takes a literal string instead
446of a string/length pair.
447
448=cut
449*/
450
451#define pad_add_name_pvs(name,flags,typestash,ourstash) \
452 Perl_pad_add_name_pvn(aTHX_ STR_WITH_LEN(name), flags, typestash, ourstash)
453
454/*
455=for apidoc Am|PADOFFSET|pad_findmy_pvs|const char *name|U32 flags
456
457Exactly like L</pad_findmy_pvn>, but takes a literal string instead
458of a string/length pair.
459
460=cut
461*/
462
463#define pad_findmy_pvs(name,flags) \
464 Perl_pad_findmy_pvn(aTHX_ STR_WITH_LEN(name), flags)
465
466/*
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467 * Local variables:
468 * c-indentation-style: bsd
469 * c-basic-offset: 4
14d04a33 470 * indent-tabs-mode: nil
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471 * End:
472 *
14d04a33 473 * ex: set ts=8 sts=4 sw=4 et:
e9a8c099 474 */