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dd2155a4 DM |
1 | /* pad.h |
2 | * | |
2eee27d7 SS |
3 | * Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008, |
4 | * 2009, 2010, 2011 by Larry Wall and others | |
dd2155a4 DM |
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 | ||
cc76b5cc Z |
14 | /* |
15 | =head1 Pad Data Structures | |
16 | */ | |
dd2155a4 DM |
17 | |
18 | ||
19 | /* a padlist is currently just an AV; but that might change, | |
20 | * so hide the type. Ditto a pad. */ | |
21 | ||
22 | typedef AV PADLIST; | |
f3548bdc | 23 | typedef AV PAD; |
dd2155a4 DM |
24 | |
25 | ||
26 | /* offsets within a pad */ | |
27 | ||
28 | #if PTRSIZE == 4 | |
29 | typedef U32TYPE PADOFFSET; | |
30 | #else | |
31 | # if PTRSIZE == 8 | |
32 | typedef U64TYPE PADOFFSET; | |
33 | # endif | |
34 | #endif | |
35 | #define NOT_IN_PAD ((PADOFFSET) -1) | |
809abb02 | 36 | |
2df5bdd7 DM |
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 | |
39 | */ | |
40 | #define PERL_PADSEQ_INTRO U32_MAX | |
41 | ||
42 | ||
7948fc08 | 43 | /* B.xs needs these for the benefit of B::Deparse */ |
809abb02 | 44 | /* Low range end is exclusive (valid from the cop seq after this one) */ |
809abb02 | 45 | /* High range end is inclusive (valid up to this cop seq) */ |
809abb02 | 46 | |
3441fb63 NC |
47 | #if defined (DEBUGGING) && defined(__GNUC__) && !defined(PERL_GCC_BRACE_GROUPS_FORBIDDEN) |
48 | # define COP_SEQ_RANGE_LOW(sv) \ | |
b1bc3f34 | 49 | (({ const SV *const _sv_cop_seq_range_low = (const SV *) (sv); \ |
7948fc08 RU |
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)); \ | |
b1bc3f34 | 57 | ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_low)))->xnv_u.xpad_cop_seq.xlow; \ |
3441fb63 NC |
58 | })) |
59 | # define COP_SEQ_RANGE_HIGH(sv) \ | |
b1bc3f34 | 60 | (({ const SV *const _sv_cop_seq_range_high = (const SV *) (sv); \ |
7948fc08 RU |
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)); \ | |
b1bc3f34 | 68 | ((XPVNV*) MUTABLE_PTR(SvANY(_sv_cop_seq_range_high)))->xnv_u.xpad_cop_seq.xhigh; \ |
3441fb63 NC |
69 | })) |
70 | # define PARENT_PAD_INDEX(sv) \ | |
b1bc3f34 | 71 | (({ const SV *const _sv_parent_pad_index = (const SV *) (sv); \ |
7948fc08 RU |
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)); \ | |
b1bc3f34 | 79 | ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_pad_index)))->xnv_u.xpad_cop_seq.xlow; \ |
3441fb63 NC |
80 | })) |
81 | # define PARENT_FAKELEX_FLAGS(sv) \ | |
b1bc3f34 | 82 | (({ const SV *const _sv_parent_fakelex_flags = (const SV *) (sv); \ |
7948fc08 RU |
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)); \ | |
b1bc3f34 | 90 | ((XPVNV*) MUTABLE_PTR(SvANY(_sv_parent_fakelex_flags)))->xnv_u.xpad_cop_seq.xhigh; \ |
3441fb63 NC |
91 | })) |
92 | #else | |
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)) | |
97 | ||
98 | ||
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)) | |
103 | #endif | |
dd2155a4 | 104 | |
6c5e080d | 105 | /* Flags set in the SvIVX field of FAKE namesvs */ |
7948fc08 | 106 | |
6c5e080d NC |
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 */ | |
109 | ||
dd2155a4 DM |
110 | /* flags for the pad_new() function */ |
111 | ||
c7c737cb DM |
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 */ | |
dd2155a4 DM |
115 | |
116 | /* values for the pad_tidy() function */ | |
117 | ||
118 | typedef enum { | |
119 | padtidy_SUB, /* tidy up a pad for a sub, */ | |
120 | padtidy_SUBCLONE, /* a cloned sub, */ | |
121 | padtidy_FORMAT /* or a format */ | |
122 | } padtidy_type; | |
123 | ||
9f6ec8dd | 124 | /* flags for pad_add_name_pvn. */ |
35f82371 | 125 | |
9f6ec8dd BF |
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_UTF8_NAME SVf_UTF8 /* name is UTF-8 encoded. */ | |
35f82371 | 130 | |
f3548bdc DM |
131 | /* ASSERT_CURPAD_LEGAL and ASSERT_CURPAD_ACTIVE respectively determine |
132 | * whether PL_comppad and PL_curpad are consistent and whether they have | |
133 | * active values */ | |
dd2155a4 | 134 | |
1dba731d NC |
135 | #ifndef PERL_MAD |
136 | # define pad_peg(label) | |
137 | #endif | |
138 | ||
f3548bdc DM |
139 | #ifdef DEBUGGING |
140 | # define ASSERT_CURPAD_LEGAL(label) \ | |
1dba731d | 141 | pad_peg(label); \ |
f3548bdc DM |
142 | if (PL_comppad ? (AvARRAY(PL_comppad) != PL_curpad) : (PL_curpad != 0)) \ |
143 | Perl_croak(aTHX_ "panic: illegal pad in %s: 0x%"UVxf"[0x%"UVxf"]",\ | |
144 | label, PTR2UV(PL_comppad), PTR2UV(PL_curpad)); | |
145 | ||
146 | ||
147 | # define ASSERT_CURPAD_ACTIVE(label) \ | |
1dba731d | 148 | pad_peg(label); \ |
f3548bdc DM |
149 | if (!PL_comppad || (AvARRAY(PL_comppad) != PL_curpad)) \ |
150 | Perl_croak(aTHX_ "panic: invalid pad in %s: 0x%"UVxf"[0x%"UVxf"]",\ | |
151 | label, PTR2UV(PL_comppad), PTR2UV(PL_curpad)); | |
152 | #else | |
153 | # define ASSERT_CURPAD_LEGAL(label) | |
154 | # define ASSERT_CURPAD_ACTIVE(label) | |
155 | #endif | |
156 | ||
157 | ||
158 | ||
159 | /* Note: the following three macros are actually defined in scope.h, but | |
dd2155a4 DM |
160 | * they are documented here for completeness, since they directly or |
161 | * indirectly affect pads. | |
162 | ||
163 | =for apidoc m|void|SAVEPADSV |PADOFFSET po | |
164 | Save a pad slot (used to restore after an iteration) | |
165 | ||
f3548bdc | 166 | XXX DAPM it would make more sense to make the arg a PADOFFSET |
dd2155a4 | 167 | =for apidoc m|void|SAVECLEARSV |SV **svp |
eeb8d49e | 168 | Clear the pointed to pad value on scope exit. (i.e. the runtime action of 'my') |
dd2155a4 DM |
169 | |
170 | =for apidoc m|void|SAVECOMPPAD | |
171 | save PL_comppad and PL_curpad | |
172 | ||
dd2155a4 DM |
173 | |
174 | ||
175 | ||
176 | ||
177 | =for apidoc m|SV *|PAD_SETSV |PADOFFSET po|SV* sv | |
178 | Set the slot at offset C<po> in the current pad to C<sv> | |
179 | ||
180 | =for apidoc m|void|PAD_SV |PADOFFSET po | |
181 | Get the value at offset C<po> in the current pad | |
182 | ||
183 | =for apidoc m|SV *|PAD_SVl |PADOFFSET po | |
184 | Lightweight and lvalue version of C<PAD_SV>. | |
185 | Get or set the value at offset C<po> in the current pad. | |
186 | Unlike C<PAD_SV>, does not print diagnostics with -DX. | |
187 | For internal use only. | |
188 | ||
189 | =for apidoc m|SV *|PAD_BASE_SV |PADLIST padlist|PADOFFSET po | |
190 | Get the value from slot C<po> in the base (DEPTH=1) pad of a padlist | |
191 | ||
192 | =for apidoc m|void|PAD_SET_CUR |PADLIST padlist|I32 n | |
193 | Set the current pad to be pad C<n> in the padlist, saving | |
fd617465 DM |
194 | the previous current pad. NB currently this macro expands to a string too |
195 | long for some compilers, so it's best to replace it with | |
196 | ||
197 | SAVECOMPPAD(); | |
198 | PAD_SET_CUR_NOSAVE(padlist,n); | |
199 | ||
dd2155a4 | 200 | |
4e380990 DM |
201 | =for apidoc m|void|PAD_SET_CUR_NOSAVE |PADLIST padlist|I32 n |
202 | like PAD_SET_CUR, but without the save | |
203 | ||
dd2155a4 DM |
204 | =for apidoc m|void|PAD_SAVE_SETNULLPAD |
205 | Save the current pad then set it to null. | |
206 | ||
f3548bdc DM |
207 | =for apidoc m|void|PAD_SAVE_LOCAL|PAD *opad|PAD *npad |
208 | Save the current pad to the local variable opad, then make the | |
209 | current pad equal to npad | |
210 | ||
211 | =for apidoc m|void|PAD_RESTORE_LOCAL|PAD *opad | |
212 | Restore the old pad saved into the local variable opad by PAD_SAVE_LOCAL() | |
dd2155a4 DM |
213 | |
214 | =cut | |
215 | */ | |
216 | ||
217 | #ifdef DEBUGGING | |
218 | # define PAD_SV(po) pad_sv(po) | |
219 | # define PAD_SETSV(po,sv) pad_setsv(po,sv) | |
220 | #else | |
221 | # define PAD_SV(po) (PL_curpad[po]) | |
222 | # define PAD_SETSV(po,sv) PL_curpad[po] = (sv) | |
223 | #endif | |
224 | ||
225 | #define PAD_SVl(po) (PL_curpad[po]) | |
226 | ||
227 | #define PAD_BASE_SV(padlist, po) \ | |
228 | (AvARRAY(padlist)[1]) \ | |
a062e10d | 229 | ? AvARRAY(MUTABLE_AV((AvARRAY(padlist)[1])))[po] : NULL; |
7948fc08 | 230 | |
dd2155a4 | 231 | |
de5e01c2 JH |
232 | #define PAD_SET_CUR_NOSAVE(padlist,nth) \ |
233 | PL_comppad = (PAD*) (AvARRAY(padlist)[nth]); \ | |
f3548bdc DM |
234 | PL_curpad = AvARRAY(PL_comppad); \ |
235 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, \ | |
236 | "Pad 0x%"UVxf"[0x%"UVxf"] set_cur depth=%d\n", \ | |
de5e01c2 | 237 | PTR2UV(PL_comppad), PTR2UV(PL_curpad), (int)(nth))); |
f3548bdc DM |
238 | |
239 | ||
de5e01c2 | 240 | #define PAD_SET_CUR(padlist,nth) \ |
4e380990 | 241 | SAVECOMPPAD(); \ |
de5e01c2 | 242 | PAD_SET_CUR_NOSAVE(padlist,nth); |
4e380990 DM |
243 | |
244 | ||
f3548bdc | 245 | #define PAD_SAVE_SETNULLPAD() SAVECOMPPAD(); \ |
4608196e | 246 | PL_comppad = NULL; PL_curpad = NULL; \ |
f3548bdc DM |
247 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad set_null\n")); |
248 | ||
249 | #define PAD_SAVE_LOCAL(opad,npad) \ | |
250 | opad = PL_comppad; \ | |
251 | PL_comppad = (npad); \ | |
4608196e | 252 | PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \ |
f3548bdc DM |
253 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, \ |
254 | "Pad 0x%"UVxf"[0x%"UVxf"] save_local\n", \ | |
255 | PTR2UV(PL_comppad), PTR2UV(PL_curpad))); | |
256 | ||
257 | #define PAD_RESTORE_LOCAL(opad) \ | |
8c63ea58 GG |
258 | assert(!opad || !SvIS_FREED(opad)); \ |
259 | PL_comppad = opad; \ | |
4608196e | 260 | PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \ |
f3548bdc DM |
261 | DEBUG_Xv(PerlIO_printf(Perl_debug_log, \ |
262 | "Pad 0x%"UVxf"[0x%"UVxf"] restore_local\n", \ | |
263 | PTR2UV(PL_comppad), PTR2UV(PL_curpad))); | |
dd2155a4 DM |
264 | |
265 | ||
266 | /* | |
267 | =for apidoc m|void|CX_CURPAD_SAVE|struct context | |
268 | Save the current pad in the given context block structure. | |
269 | ||
f3548bdc | 270 | =for apidoc m|SV *|CX_CURPAD_SV|struct context|PADOFFSET po |
dd2155a4 DM |
271 | Access the SV at offset po in the saved current pad in the given |
272 | context block structure (can be used as an lvalue). | |
273 | ||
274 | =cut | |
275 | */ | |
276 | ||
f3548bdc | 277 | #define CX_CURPAD_SAVE(block) (block).oldcomppad = PL_comppad |
a062e10d | 278 | #define CX_CURPAD_SV(block,po) (AvARRAY(MUTABLE_AV(((block).oldcomppad)))[po]) |
dd2155a4 DM |
279 | |
280 | ||
281 | /* | |
282 | =for apidoc m|U32|PAD_COMPNAME_FLAGS|PADOFFSET po | |
283 | Return the flags for the current compiling pad name | |
284 | at offset C<po>. Assumes a valid slot entry. | |
285 | ||
286 | =for apidoc m|char *|PAD_COMPNAME_PV|PADOFFSET po | |
287 | Return the name of the current compiling pad name | |
288 | at offset C<po>. Assumes a valid slot entry. | |
289 | ||
290 | =for apidoc m|HV *|PAD_COMPNAME_TYPE|PADOFFSET po | |
291 | Return the type (stash) of the current compiling pad name at offset | |
292 | C<po>. Must be a valid name. Returns null if not typed. | |
293 | ||
294 | =for apidoc m|HV *|PAD_COMPNAME_OURSTASH|PADOFFSET po | |
295 | Return the stash associated with an C<our> variable. | |
296 | Assumes the slot entry is a valid C<our> lexical. | |
297 | ||
298 | =for apidoc m|STRLEN|PAD_COMPNAME_GEN|PADOFFSET po | |
299 | The generation number of the name at offset C<po> in the current | |
931b58fb | 300 | compiling pad (lvalue). Note that C<SvUVX> is hijacked for this purpose. |
dd2155a4 | 301 | |
b162af07 SP |
302 | =for apidoc m|STRLEN|PAD_COMPNAME_GEN_set|PADOFFSET po|int gen |
303 | Sets the generation number of the name at offset C<po> in the current | |
931b58fb | 304 | ling pad (lvalue) to C<gen>. Note that C<SvUV_set> is hijacked for this purpose. |
b162af07 | 305 | |
dd2155a4 | 306 | =cut |
b162af07 | 307 | |
dd2155a4 DM |
308 | */ |
309 | ||
f8503592 NC |
310 | #define PAD_COMPNAME_SV(po) (*av_fetch(PL_comppad_name, (po), FALSE)) |
311 | #define PAD_COMPNAME_FLAGS(po) SvFLAGS(PAD_COMPNAME_SV(po)) | |
1979170b | 312 | #define PAD_COMPNAME_FLAGS_isOUR(po) SvPAD_OUR(PAD_COMPNAME_SV(po)) |
f8503592 | 313 | #define PAD_COMPNAME_PV(po) SvPV_nolen(PAD_COMPNAME_SV(po)) |
dd2155a4 | 314 | |
b21dc031 | 315 | #define PAD_COMPNAME_TYPE(po) pad_compname_type(po) |
dd2155a4 DM |
316 | |
317 | #define PAD_COMPNAME_OURSTASH(po) \ | |
73d95100 | 318 | (SvOURSTASH(PAD_COMPNAME_SV(po))) |
dd2155a4 | 319 | |
931b58fb | 320 | #define PAD_COMPNAME_GEN(po) ((STRLEN)SvUVX(AvARRAY(PL_comppad_name)[po])) |
dd2155a4 | 321 | |
931b58fb | 322 | #define PAD_COMPNAME_GEN_set(po, gen) SvUV_set(AvARRAY(PL_comppad_name)[po], (UV)(gen)) |
dd2155a4 DM |
323 | |
324 | ||
325 | /* | |
d77cdebf | 326 | =for apidoc m|void|PAD_CLONE_VARS|PerlInterpreter *proto_perl|CLONE_PARAMS* param |
dd2155a4 DM |
327 | Clone the state variables associated with running and compiling pads. |
328 | ||
329 | =cut | |
330 | */ | |
331 | ||
c5ab0850 DM |
332 | /* NB - we set PL_comppad to null unless it points at a value that |
333 | * has already been dup'ed, ie it points to part of an active padlist. | |
334 | * Otherwise PL_comppad ends up being a leaked scalar in code like | |
335 | * the following: | |
336 | * threads->create(sub { threads->create(sub {...} ) } ); | |
337 | * where the second thread dups the outer sub's comppad but not the | |
338 | * sub's CV or padlist. */ | |
f3548bdc | 339 | |
dd2155a4 | 340 | #define PAD_CLONE_VARS(proto_perl, param) \ |
a062e10d | 341 | PL_comppad = MUTABLE_AV(ptr_table_fetch(PL_ptr_table, proto_perl->Icomppad)); \ |
4608196e | 342 | PL_curpad = PL_comppad ? AvARRAY(PL_comppad) : NULL; \ |
dd2155a4 DM |
343 | PL_comppad_name = av_dup(proto_perl->Icomppad_name, param); \ |
344 | PL_comppad_name_fill = proto_perl->Icomppad_name_fill; \ | |
345 | PL_comppad_name_floor = proto_perl->Icomppad_name_floor; \ | |
dd2155a4 DM |
346 | PL_min_intro_pending = proto_perl->Imin_intro_pending; \ |
347 | PL_max_intro_pending = proto_perl->Imax_intro_pending; \ | |
348 | PL_padix = proto_perl->Ipadix; \ | |
349 | PL_padix_floor = proto_perl->Ipadix_floor; \ | |
350 | PL_pad_reset_pending = proto_perl->Ipad_reset_pending; \ | |
351 | PL_cop_seqmax = proto_perl->Icop_seqmax; | |
e9a8c099 MHM |
352 | |
353 | /* | |
cc76b5cc Z |
354 | =for apidoc Am|PADOFFSET|pad_add_name_pvs|const char *name|U32 flags|HV *typestash|HV *ourstash |
355 | ||
356 | Exactly like L</pad_add_name_pvn>, but takes a literal string instead | |
357 | of a string/length pair. | |
358 | ||
359 | =cut | |
360 | */ | |
361 | ||
362 | #define pad_add_name_pvs(name,flags,typestash,ourstash) \ | |
363 | Perl_pad_add_name_pvn(aTHX_ STR_WITH_LEN(name), flags, typestash, ourstash) | |
364 | ||
365 | /* | |
366 | =for apidoc Am|PADOFFSET|pad_findmy_pvs|const char *name|U32 flags | |
367 | ||
368 | Exactly like L</pad_findmy_pvn>, but takes a literal string instead | |
369 | of a string/length pair. | |
370 | ||
371 | =cut | |
372 | */ | |
373 | ||
374 | #define pad_findmy_pvs(name,flags) \ | |
375 | Perl_pad_findmy_pvn(aTHX_ STR_WITH_LEN(name), flags) | |
376 | ||
377 | /* | |
e9a8c099 MHM |
378 | * Local variables: |
379 | * c-indentation-style: bsd | |
380 | * c-basic-offset: 4 | |
381 | * indent-tabs-mode: t | |
382 | * End: | |
383 | * | |
384 | * ex: set ts=8 sts=4 sw=4 noet: | |
385 | */ |