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22a52da1 | 1 | /* Copyright (C) 1995,1996,1998,2000,2001 Free Software Foundation, Inc. |
0f2d19dd JB |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of this library. | |
20 | * | |
21 | * The exception is that, if you link this library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking this library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by | |
31 | * Free Software Foundation as part of this library. If you copy | |
32 | * code from other releases distributed under the terms of the GPL into a copy of | |
33 | * this library, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from such code. | |
37 | * | |
38 | * If you write modifications of your own for this library, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 | 41 | |
1bbd0b84 | 42 | |
0f2d19dd | 43 | \f |
592996c9 | 44 | |
a0599745 MD |
45 | #include "libguile/_scm.h" |
46 | #include "libguile/vectors.h" | |
c96d76b8 | 47 | #include "libguile/lang.h" |
0f2d19dd | 48 | |
a0599745 MD |
49 | #include "libguile/validate.h" |
50 | #include "libguile/weaks.h" | |
0f2d19dd | 51 | |
592996c9 | 52 | \f |
0f2d19dd JB |
53 | |
54 | /* {Weak Vectors} | |
55 | */ | |
56 | ||
57 | ||
592996c9 DH |
58 | /* Allocate memory for a weak vector on behalf of the caller. The allocated |
59 | * vector will be of the given weak vector subtype. It will contain size | |
60 | * elements which are initialized with the 'fill' object, or, if 'fill' is | |
61 | * undefined, with an unspecified object. | |
62 | */ | |
63 | static SCM | |
64 | allocate_weak_vector (scm_t_bits type, SCM size, SCM fill, const char* caller) | |
65 | #define FUNC_NAME caller | |
66 | { | |
67 | if (SCM_INUMP (size)) | |
68 | { | |
69 | size_t c_size; | |
70 | SCM v; | |
71 | ||
72 | SCM_ASSERT_RANGE (1, size, SCM_INUM (size) >= 0); | |
73 | c_size = SCM_INUM (size); | |
74 | ||
592996c9 DH |
75 | if (c_size > 0) |
76 | { | |
77 | scm_t_bits *base; | |
78 | size_t j; | |
79 | ||
80 | if (SCM_UNBNDP (fill)) | |
81 | fill = SCM_UNSPECIFIED; | |
82 | ||
83 | SCM_ASSERT_RANGE (1, size, c_size <= SCM_VECTOR_MAX_LENGTH); | |
4c9419ac | 84 | base = scm_gc_malloc (c_size * sizeof (scm_t_bits), "weak vector"); |
592996c9 DH |
85 | for (j = 0; j != c_size; ++j) |
86 | base[j] = SCM_UNPACK (fill); | |
228a24ef DH |
87 | v = scm_double_cell (SCM_MAKE_VECTOR_TAG (c_size, scm_tc7_wvect), |
88 | (scm_t_bits) base, | |
89 | type, | |
90 | SCM_UNPACK (SCM_EOL)); | |
592996c9 DH |
91 | scm_remember_upto_here_1 (fill); |
92 | } | |
93 | else | |
94 | { | |
228a24ef DH |
95 | v = scm_double_cell (SCM_MAKE_VECTOR_TAG (0, scm_tc7_wvect), |
96 | (scm_t_bits) NULL, | |
97 | type, | |
98 | SCM_UNPACK (SCM_EOL)); | |
592996c9 DH |
99 | } |
100 | ||
101 | return v; | |
102 | } | |
103 | else if (SCM_BIGP (size)) | |
104 | SCM_OUT_OF_RANGE (1, size); | |
105 | else | |
106 | SCM_WRONG_TYPE_ARG (1, size); | |
107 | } | |
108 | #undef FUNC_NAME | |
109 | ||
110 | ||
3b3b36dd | 111 | SCM_DEFINE (scm_make_weak_vector, "make-weak-vector", 1, 1, 0, |
1e6808ea | 112 | (SCM size, SCM fill), |
b380b885 | 113 | "Return a weak vector with @var{size} elements. If the optional\n" |
1e6808ea MG |
114 | "argument @var{fill} is given, all entries in the vector will be\n" |
115 | "set to @var{fill}. The default value for @var{fill} is the\n" | |
116 | "empty list.") | |
1bbd0b84 | 117 | #define FUNC_NAME s_scm_make_weak_vector |
0f2d19dd | 118 | { |
592996c9 | 119 | return allocate_weak_vector (0, size, fill, FUNC_NAME); |
0f2d19dd | 120 | } |
1bbd0b84 | 121 | #undef FUNC_NAME |
0f2d19dd JB |
122 | |
123 | ||
1bbd0b84 | 124 | SCM_REGISTER_PROC(s_list_to_weak_vector, "list->weak-vector", 1, 0, 0, scm_weak_vector); |
1cc91f1b | 125 | |
3b3b36dd | 126 | SCM_DEFINE (scm_weak_vector, "weak-vector", 0, 0, 1, |
1bbd0b84 | 127 | (SCM l), |
8f85c0c6 | 128 | "@deffnx {Scheme Procedure} list->weak-vector l\n" |
1e6808ea MG |
129 | "Construct a weak vector from a list: @code{weak-vector} uses\n" |
130 | "the list of its arguments while @code{list->weak-vector} uses\n" | |
131 | "its only argument @var{l} (a list) to construct a weak vector\n" | |
132 | "the same way @code{list->vector} would.") | |
1bbd0b84 | 133 | #define FUNC_NAME s_scm_weak_vector |
0f2d19dd JB |
134 | { |
135 | SCM res; | |
22a52da1 | 136 | SCM *data; |
c014a02e | 137 | long i; |
0f2d19dd | 138 | |
22a52da1 DH |
139 | /* Dirk:FIXME:: In case of multiple threads, the list might get corrupted |
140 | while the vector is being created. */ | |
0f2d19dd | 141 | i = scm_ilength (l); |
1bbd0b84 | 142 | SCM_ASSERT (i >= 0, l, SCM_ARG1, FUNC_NAME); |
0f2d19dd | 143 | res = scm_make_weak_vector (SCM_MAKINUM (i), SCM_UNSPECIFIED); |
22a52da1 | 144 | |
34d19ef6 HWN |
145 | /* |
146 | no alloc, so this loop is safe. | |
147 | */ | |
148 | data = SCM_WRITABLE_VELTS (res); | |
c96d76b8 | 149 | while (!SCM_NULL_OR_NIL_P (l)) |
22a52da1 DH |
150 | { |
151 | *data++ = SCM_CAR (l); | |
152 | l = SCM_CDR (l); | |
153 | } | |
154 | ||
0f2d19dd JB |
155 | return res; |
156 | } | |
1bbd0b84 | 157 | #undef FUNC_NAME |
0f2d19dd JB |
158 | |
159 | ||
3b3b36dd | 160 | SCM_DEFINE (scm_weak_vector_p, "weak-vector?", 1, 0, 0, |
1e6808ea | 161 | (SCM obj), |
5352393c MG |
162 | "Return @code{#t} if @var{obj} is a weak vector. Note that all\n" |
163 | "weak hashes are also weak vectors.") | |
1bbd0b84 | 164 | #define FUNC_NAME s_scm_weak_vector_p |
0f2d19dd | 165 | { |
592996c9 | 166 | return SCM_BOOL (SCM_WVECTP (obj) && !SCM_IS_WHVEC (obj)); |
0f2d19dd | 167 | } |
1bbd0b84 | 168 | #undef FUNC_NAME |
0f2d19dd | 169 | |
0f2d19dd JB |
170 | \f |
171 | ||
3b3b36dd | 172 | SCM_DEFINE (scm_make_weak_key_hash_table, "make-weak-key-hash-table", 1, 0, 0, |
1e6808ea | 173 | (SCM size), |
8f85c0c6 NJ |
174 | "@deffnx {Scheme Procedure} make-weak-value-hash-table size\n" |
175 | "@deffnx {Scheme Procedure} make-doubly-weak-hash-table size\n" | |
1e6808ea MG |
176 | "Return a weak hash table with @var{size} buckets. As with any\n" |
177 | "hash table, choosing a good size for the table requires some\n" | |
178 | "caution.\n" | |
179 | "\n" | |
180 | "You can modify weak hash tables in exactly the same way you\n" | |
181 | "would modify regular hash tables. (@pxref{Hash Tables})") | |
1bbd0b84 | 182 | #define FUNC_NAME s_scm_make_weak_key_hash_table |
0f2d19dd | 183 | { |
592996c9 | 184 | return allocate_weak_vector (1, size, SCM_EOL, FUNC_NAME); |
0f2d19dd | 185 | } |
1bbd0b84 | 186 | #undef FUNC_NAME |
0f2d19dd JB |
187 | |
188 | ||
a1ec6916 | 189 | SCM_DEFINE (scm_make_weak_value_hash_table, "make-weak-value-hash-table", 1, 0, 0, |
1e6808ea | 190 | (SCM size), |
e3239868 DH |
191 | "Return a hash table with weak values with @var{size} buckets.\n" |
192 | "(@pxref{Hash Tables})") | |
1bbd0b84 | 193 | #define FUNC_NAME s_scm_make_weak_value_hash_table |
0f2d19dd | 194 | { |
592996c9 | 195 | return allocate_weak_vector (2, size, SCM_EOL, FUNC_NAME); |
0f2d19dd | 196 | } |
1bbd0b84 | 197 | #undef FUNC_NAME |
0f2d19dd JB |
198 | |
199 | ||
a1ec6916 | 200 | SCM_DEFINE (scm_make_doubly_weak_hash_table, "make-doubly-weak-hash-table", 1, 0, 0, |
1e6808ea | 201 | (SCM size), |
e3239868 DH |
202 | "Return a hash table with weak keys and values with @var{size}\n" |
203 | "buckets. (@pxref{Hash Tables})") | |
1bbd0b84 | 204 | #define FUNC_NAME s_scm_make_doubly_weak_hash_table |
0f2d19dd | 205 | { |
592996c9 | 206 | return allocate_weak_vector (3, size, SCM_EOL, FUNC_NAME); |
0f2d19dd | 207 | } |
1bbd0b84 | 208 | #undef FUNC_NAME |
0f2d19dd | 209 | |
592996c9 | 210 | |
3b3b36dd | 211 | SCM_DEFINE (scm_weak_key_hash_table_p, "weak-key-hash-table?", 1, 0, 0, |
1e6808ea | 212 | (SCM obj), |
8f85c0c6 NJ |
213 | "@deffnx {Scheme Procedure} weak-value-hash-table? obj\n" |
214 | "@deffnx {Scheme Procedure} doubly-weak-hash-table? obj\n" | |
5352393c MG |
215 | "Return @code{#t} if @var{obj} is the specified weak hash\n" |
216 | "table. Note that a doubly weak hash table is neither a weak key\n" | |
217 | "nor a weak value hash table.") | |
1bbd0b84 | 218 | #define FUNC_NAME s_scm_weak_key_hash_table_p |
0f2d19dd | 219 | { |
592996c9 | 220 | return SCM_BOOL (SCM_WVECTP (obj) && SCM_IS_WHVEC (obj)); |
0f2d19dd | 221 | } |
1bbd0b84 | 222 | #undef FUNC_NAME |
0f2d19dd JB |
223 | |
224 | ||
a1ec6916 | 225 | SCM_DEFINE (scm_weak_value_hash_table_p, "weak-value-hash-table?", 1, 0, 0, |
1e6808ea MG |
226 | (SCM obj), |
227 | "Return @code{#t} if @var{obj} is a weak value hash table.") | |
1bbd0b84 | 228 | #define FUNC_NAME s_scm_weak_value_hash_table_p |
0f2d19dd | 229 | { |
592996c9 | 230 | return SCM_BOOL (SCM_WVECTP (obj) && SCM_IS_WHVEC_V (obj)); |
0f2d19dd | 231 | } |
1bbd0b84 | 232 | #undef FUNC_NAME |
0f2d19dd JB |
233 | |
234 | ||
a1ec6916 | 235 | SCM_DEFINE (scm_doubly_weak_hash_table_p, "doubly-weak-hash-table?", 1, 0, 0, |
1e6808ea MG |
236 | (SCM obj), |
237 | "Return @code{#t} if @var{obj} is a doubly weak hash table.") | |
1bbd0b84 | 238 | #define FUNC_NAME s_scm_doubly_weak_hash_table_p |
0f2d19dd | 239 | { |
592996c9 | 240 | return SCM_BOOL (SCM_WVECTP (obj) && SCM_IS_WHVEC_B (obj)); |
0f2d19dd | 241 | } |
1bbd0b84 | 242 | #undef FUNC_NAME |
0f2d19dd | 243 | |
592996c9 | 244 | |
d662820a | 245 | static void * |
e81d98ec DH |
246 | scm_weak_vector_gc_init (void *dummy1 SCM_UNUSED, |
247 | void *dummy2 SCM_UNUSED, | |
248 | void *dummy3 SCM_UNUSED) | |
d662820a MD |
249 | { |
250 | scm_weak_vectors = SCM_EOL; | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
592996c9 | 255 | |
d662820a | 256 | static void * |
e81d98ec DH |
257 | scm_mark_weak_vector_spines (void *dummy1 SCM_UNUSED, |
258 | void *dummy2 SCM_UNUSED, | |
259 | void *dummy3 SCM_UNUSED) | |
d662820a MD |
260 | { |
261 | SCM w; | |
262 | ||
263 | for (w = scm_weak_vectors; !SCM_NULLP (w); w = SCM_WVECT_GC_CHAIN (w)) | |
264 | { | |
265 | if (SCM_IS_WHVEC_ANY (w)) | |
266 | { | |
34d19ef6 | 267 | SCM const *ptr; |
d662820a | 268 | SCM obj; |
c014a02e ML |
269 | long j; |
270 | long n; | |
d662820a MD |
271 | |
272 | obj = w; | |
273 | ptr = SCM_VELTS (w); | |
bfa974f0 | 274 | n = SCM_VECTOR_LENGTH (w); |
d662820a MD |
275 | for (j = 0; j < n; ++j) |
276 | { | |
277 | SCM alist; | |
278 | ||
279 | alist = ptr[j]; | |
280 | while ( SCM_CONSP (alist) | |
281 | && !SCM_GCMARKP (alist) | |
282 | && SCM_CONSP (SCM_CAR (alist))) | |
283 | { | |
284 | SCM_SETGCMARK (alist); | |
285 | SCM_SETGCMARK (SCM_CAR (alist)); | |
fd336365 | 286 | alist = SCM_CDR (alist); |
d662820a MD |
287 | } |
288 | } | |
289 | } | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
592996c9 | 295 | |
d662820a | 296 | static void * |
e81d98ec DH |
297 | scm_scan_weak_vectors (void *dummy1 SCM_UNUSED, |
298 | void *dummy2 SCM_UNUSED, | |
299 | void *dummy3 SCM_UNUSED) | |
d662820a MD |
300 | { |
301 | SCM *ptr, w; | |
302 | for (w = scm_weak_vectors; !SCM_NULLP (w); w = SCM_WVECT_GC_CHAIN (w)) | |
303 | { | |
304 | if (!SCM_IS_WHVEC_ANY (w)) | |
305 | { | |
306 | register long j, n; | |
307 | ||
34d19ef6 | 308 | ptr = SCM_GC_WRITABLE_VELTS (w); |
bfa974f0 | 309 | n = SCM_VECTOR_LENGTH (w); |
d662820a | 310 | for (j = 0; j < n; ++j) |
406c7d90 | 311 | if (SCM_FREE_CELL_P (ptr[j])) |
d662820a MD |
312 | ptr[j] = SCM_BOOL_F; |
313 | } | |
314 | else /* if (SCM_IS_WHVEC_ANY (scm_weak_vectors[i])) */ | |
315 | { | |
316 | SCM obj = w; | |
c014a02e ML |
317 | register long n = SCM_VECTOR_LENGTH (w); |
318 | register long j; | |
d9dcd933 ML |
319 | int weak_keys = SCM_IS_WHVEC (obj) || SCM_IS_WHVEC_B (obj); |
320 | int weak_values = SCM_IS_WHVEC_V (obj) || SCM_IS_WHVEC_B (obj); | |
d662820a | 321 | |
34d19ef6 | 322 | ptr = SCM_GC_WRITABLE_VELTS (w); |
d662820a MD |
323 | |
324 | for (j = 0; j < n; ++j) | |
325 | { | |
326 | SCM * fixup; | |
327 | SCM alist; | |
d662820a MD |
328 | |
329 | fixup = ptr + j; | |
330 | alist = *fixup; | |
331 | ||
332 | while ( SCM_CONSP (alist) | |
333 | && SCM_CONSP (SCM_CAR (alist))) | |
334 | { | |
335 | SCM key; | |
336 | SCM value; | |
337 | ||
338 | key = SCM_CAAR (alist); | |
339 | value = SCM_CDAR (alist); | |
406c7d90 DH |
340 | if ( (weak_keys && SCM_FREE_CELL_P (key)) |
341 | || (weak_values && SCM_FREE_CELL_P (value))) | |
d662820a MD |
342 | { |
343 | *fixup = SCM_CDR (alist); | |
344 | } | |
345 | else | |
346 | fixup = SCM_CDRLOC (alist); | |
347 | alist = SCM_CDR (alist); | |
348 | } | |
349 | } | |
350 | } | |
351 | } | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
0f2d19dd JB |
356 | \f |
357 | ||
d662820a MD |
358 | void |
359 | scm_weaks_prehistory () | |
360 | { | |
361 | scm_c_hook_add (&scm_before_mark_c_hook, scm_weak_vector_gc_init, 0, 0); | |
362 | scm_c_hook_add (&scm_before_sweep_c_hook, scm_mark_weak_vector_spines, 0, 0); | |
363 | scm_c_hook_add (&scm_after_sweep_c_hook, scm_scan_weak_vectors, 0, 0); | |
364 | } | |
365 | ||
592996c9 | 366 | |
0f2d19dd JB |
367 | void |
368 | scm_init_weaks () | |
0f2d19dd | 369 | { |
a0599745 | 370 | #include "libguile/weaks.x" |
0f2d19dd JB |
371 | } |
372 | ||
89e00824 ML |
373 | |
374 | /* | |
375 | Local Variables: | |
376 | c-file-style: "gnu" | |
377 | End: | |
378 | */ |