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2b829bbb | 1 | /* Copyright (C) 1995,1996,1998,2000,2001, 2003, 2006 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 | |
92205699 MV |
15 | * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
16 | * Boston, MA 02110-1301 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 | |
06c1d900 MV |
45 | #include <stdio.h> |
46 | ||
a0599745 MD |
47 | #include "libguile/_scm.h" |
48 | #include "libguile/vectors.h" | |
c96d76b8 | 49 | #include "libguile/lang.h" |
f59a096e | 50 | #include "libguile/hashtab.h" |
0f2d19dd | 51 | |
a0599745 MD |
52 | #include "libguile/validate.h" |
53 | #include "libguile/weaks.h" | |
0f2d19dd | 54 | |
592996c9 | 55 | \f |
0f2d19dd | 56 | |
c35738c1 MD |
57 | /* 1. The current hash table implementation in hashtab.c uses weak alist |
58 | * vectors (formerly called weak hash tables) internally. | |
59 | * | |
60 | * 2. All hash table operations still work on alist vectors. | |
61 | * | |
62 | * 3. The weak vector and alist vector Scheme API is accessed through | |
63 | * the module (ice-9 weak-vector). | |
64 | */ | |
65 | ||
66 | ||
0f2d19dd JB |
67 | /* {Weak Vectors} |
68 | */ | |
69 | ||
70 | ||
3b3b36dd | 71 | SCM_DEFINE (scm_make_weak_vector, "make-weak-vector", 1, 1, 0, |
1e6808ea | 72 | (SCM size, SCM fill), |
b380b885 | 73 | "Return a weak vector with @var{size} elements. If the optional\n" |
1e6808ea MG |
74 | "argument @var{fill} is given, all entries in the vector will be\n" |
75 | "set to @var{fill}. The default value for @var{fill} is the\n" | |
76 | "empty list.") | |
1bbd0b84 | 77 | #define FUNC_NAME s_scm_make_weak_vector |
0f2d19dd | 78 | { |
6e708ef2 | 79 | return scm_i_allocate_weak_vector (0, size, fill); |
0f2d19dd | 80 | } |
1bbd0b84 | 81 | #undef FUNC_NAME |
0f2d19dd JB |
82 | |
83 | ||
1bbd0b84 | 84 | SCM_REGISTER_PROC(s_list_to_weak_vector, "list->weak-vector", 1, 0, 0, scm_weak_vector); |
1cc91f1b | 85 | |
3b3b36dd | 86 | SCM_DEFINE (scm_weak_vector, "weak-vector", 0, 0, 1, |
1bbd0b84 | 87 | (SCM l), |
8f85c0c6 | 88 | "@deffnx {Scheme Procedure} list->weak-vector l\n" |
1e6808ea MG |
89 | "Construct a weak vector from a list: @code{weak-vector} uses\n" |
90 | "the list of its arguments while @code{list->weak-vector} uses\n" | |
91 | "its only argument @var{l} (a list) to construct a weak vector\n" | |
92 | "the same way @code{list->vector} would.") | |
1bbd0b84 | 93 | #define FUNC_NAME s_scm_weak_vector |
0f2d19dd | 94 | { |
6e708ef2 MV |
95 | scm_t_array_handle handle; |
96 | SCM res, *data; | |
c014a02e | 97 | long i; |
0f2d19dd JB |
98 | |
99 | i = scm_ilength (l); | |
1bbd0b84 | 100 | SCM_ASSERT (i >= 0, l, SCM_ARG1, FUNC_NAME); |
6e708ef2 | 101 | |
e11e83f3 | 102 | res = scm_make_weak_vector (scm_from_int (i), SCM_UNSPECIFIED); |
6e708ef2 | 103 | data = scm_vector_writable_elements (res, &handle, NULL, NULL); |
22a52da1 | 104 | |
6e708ef2 | 105 | while (scm_is_pair (l) && i > 0) |
22a52da1 DH |
106 | { |
107 | *data++ = SCM_CAR (l); | |
108 | l = SCM_CDR (l); | |
6e708ef2 | 109 | i--; |
22a52da1 DH |
110 | } |
111 | ||
c8857a4d MV |
112 | scm_array_handle_release (&handle); |
113 | ||
0f2d19dd JB |
114 | return res; |
115 | } | |
1bbd0b84 | 116 | #undef FUNC_NAME |
0f2d19dd JB |
117 | |
118 | ||
3b3b36dd | 119 | SCM_DEFINE (scm_weak_vector_p, "weak-vector?", 1, 0, 0, |
1e6808ea | 120 | (SCM obj), |
5352393c MG |
121 | "Return @code{#t} if @var{obj} is a weak vector. Note that all\n" |
122 | "weak hashes are also weak vectors.") | |
1bbd0b84 | 123 | #define FUNC_NAME s_scm_weak_vector_p |
0f2d19dd | 124 | { |
6e708ef2 | 125 | return scm_from_bool (SCM_I_WVECTP (obj) && !SCM_IS_WHVEC (obj)); |
0f2d19dd | 126 | } |
1bbd0b84 | 127 | #undef FUNC_NAME |
0f2d19dd | 128 | |
0f2d19dd | 129 | \f |
3a2de079 LC |
130 | /* Weak alist vectors, i.e., vectors of alists. |
131 | ||
132 | The alist vector themselves are _not_ weak. The `car' (or `cdr', or both) | |
133 | of the pairs within it are weak. See `hashtab.c' for details. */ | |
0f2d19dd | 134 | |
c35738c1 | 135 | SCM_DEFINE (scm_make_weak_key_alist_vector, "make-weak-key-alist-vector", 0, 1, 0, |
1e6808ea | 136 | (SCM size), |
c35738c1 MD |
137 | "@deffnx {Scheme Procedure} make-weak-value-alist-vector size\n" |
138 | "@deffnx {Scheme Procedure} make-doubly-weak-alist-vector size\n" | |
1e6808ea MG |
139 | "Return a weak hash table with @var{size} buckets. As with any\n" |
140 | "hash table, choosing a good size for the table requires some\n" | |
141 | "caution.\n" | |
142 | "\n" | |
143 | "You can modify weak hash tables in exactly the same way you\n" | |
144 | "would modify regular hash tables. (@pxref{Hash Tables})") | |
c35738c1 | 145 | #define FUNC_NAME s_scm_make_weak_key_alist_vector |
0f2d19dd | 146 | { |
3a2de079 | 147 | return scm_make_vector (size, SCM_EOL); |
0f2d19dd | 148 | } |
1bbd0b84 | 149 | #undef FUNC_NAME |
0f2d19dd JB |
150 | |
151 | ||
c35738c1 | 152 | SCM_DEFINE (scm_make_weak_value_alist_vector, "make-weak-value-alist-vector", 0, 1, 0, |
1e6808ea | 153 | (SCM size), |
e3239868 DH |
154 | "Return a hash table with weak values with @var{size} buckets.\n" |
155 | "(@pxref{Hash Tables})") | |
c35738c1 | 156 | #define FUNC_NAME s_scm_make_weak_value_alist_vector |
0f2d19dd | 157 | { |
3a2de079 | 158 | return scm_make_vector (size, SCM_EOL); |
0f2d19dd | 159 | } |
1bbd0b84 | 160 | #undef FUNC_NAME |
0f2d19dd JB |
161 | |
162 | ||
c35738c1 | 163 | SCM_DEFINE (scm_make_doubly_weak_alist_vector, "make-doubly-weak-alist-vector", 1, 0, 0, |
1e6808ea | 164 | (SCM size), |
e3239868 DH |
165 | "Return a hash table with weak keys and values with @var{size}\n" |
166 | "buckets. (@pxref{Hash Tables})") | |
c35738c1 | 167 | #define FUNC_NAME s_scm_make_doubly_weak_alist_vector |
0f2d19dd | 168 | { |
3a2de079 | 169 | return scm_make_vector (size, SCM_EOL); |
0f2d19dd | 170 | } |
1bbd0b84 | 171 | #undef FUNC_NAME |
0f2d19dd | 172 | |
592996c9 | 173 | |
c35738c1 | 174 | SCM_DEFINE (scm_weak_key_alist_vector_p, "weak-key-alist-vector?", 1, 0, 0, |
1e6808ea | 175 | (SCM obj), |
c35738c1 MD |
176 | "@deffnx {Scheme Procedure} weak-value-alist-vector? obj\n" |
177 | "@deffnx {Scheme Procedure} doubly-weak-alist-vector? obj\n" | |
5352393c MG |
178 | "Return @code{#t} if @var{obj} is the specified weak hash\n" |
179 | "table. Note that a doubly weak hash table is neither a weak key\n" | |
180 | "nor a weak value hash table.") | |
c35738c1 | 181 | #define FUNC_NAME s_scm_weak_key_alist_vector_p |
0f2d19dd | 182 | { |
6e708ef2 | 183 | return scm_from_bool (SCM_I_WVECTP (obj) && SCM_IS_WHVEC (obj)); |
0f2d19dd | 184 | } |
1bbd0b84 | 185 | #undef FUNC_NAME |
0f2d19dd JB |
186 | |
187 | ||
c35738c1 | 188 | SCM_DEFINE (scm_weak_value_alist_vector_p, "weak-value-alist-vector?", 1, 0, 0, |
1e6808ea MG |
189 | (SCM obj), |
190 | "Return @code{#t} if @var{obj} is a weak value hash table.") | |
c35738c1 | 191 | #define FUNC_NAME s_scm_weak_value_alist_vector_p |
0f2d19dd | 192 | { |
6e708ef2 | 193 | return scm_from_bool (SCM_I_WVECTP (obj) && SCM_IS_WHVEC_V (obj)); |
0f2d19dd | 194 | } |
1bbd0b84 | 195 | #undef FUNC_NAME |
0f2d19dd JB |
196 | |
197 | ||
c35738c1 | 198 | SCM_DEFINE (scm_doubly_weak_alist_vector_p, "doubly-weak-alist-vector?", 1, 0, 0, |
1e6808ea MG |
199 | (SCM obj), |
200 | "Return @code{#t} if @var{obj} is a doubly weak hash table.") | |
c35738c1 | 201 | #define FUNC_NAME s_scm_doubly_weak_alist_vector_p |
0f2d19dd | 202 | { |
6e708ef2 | 203 | return scm_from_bool (SCM_I_WVECTP (obj) && SCM_IS_WHVEC_B (obj)); |
0f2d19dd | 204 | } |
1bbd0b84 | 205 | #undef FUNC_NAME |
0f2d19dd | 206 | |
26224b3f LC |
207 | #define UNMARKED_CELL_P(x) 1 /* (SCM_NIMP(x) && !SCM_GC_MARK_P (x)) *//* |
208 | FIXME */ | |
592996c9 | 209 | |
592996c9 | 210 | |
06c1d900 MV |
211 | static void |
212 | scm_i_remove_weaks (SCM w) | |
d662820a | 213 | { |
26224b3f LC |
214 | return; /* FIXME */ |
215 | #if 0 | |
06c1d900 MV |
216 | SCM *ptr = SCM_I_WVECT_GC_WVELTS (w); |
217 | size_t n = SCM_I_WVECT_LENGTH (w); | |
218 | size_t i; | |
219 | ||
220 | if (!SCM_IS_WHVEC_ANY (w)) | |
d662820a | 221 | { |
06c1d900 MV |
222 | for (i = 0; i < n; ++i) |
223 | if (UNMARKED_CELL_P (ptr[i])) | |
224 | ptr[i] = SCM_BOOL_F; | |
225 | } | |
226 | else | |
227 | { | |
228 | size_t delta = 0; | |
d662820a | 229 | |
06c1d900 | 230 | for (i = 0; i < n; ++i) |
d662820a | 231 | { |
06c1d900 | 232 | SCM alist, *fixup; |
d662820a | 233 | |
06c1d900 MV |
234 | fixup = ptr + i; |
235 | alist = *fixup; | |
236 | while (scm_is_pair (alist) && !SCM_GC_MARK_P (alist)) | |
d662820a | 237 | { |
06c1d900 | 238 | if (UNMARKED_CELL_P (SCM_CAR (alist))) |
d662820a | 239 | { |
06c1d900 MV |
240 | *fixup = SCM_CDR (alist); |
241 | delta++; | |
242 | } | |
243 | else | |
244 | { | |
245 | SCM_SET_GC_MARK (alist); | |
246 | fixup = SCM_CDRLOC (alist); | |
d662820a | 247 | } |
06c1d900 | 248 | alist = *fixup; |
d662820a MD |
249 | } |
250 | } | |
06c1d900 MV |
251 | #if 0 |
252 | if (delta) | |
253 | fprintf (stderr, "vector %p, delta %d\n", w, delta); | |
254 | #endif | |
255 | SCM_I_SET_WVECT_DELTA (w, delta); | |
d662820a | 256 | } |
26224b3f | 257 | #endif |
d662820a MD |
258 | } |
259 | ||
3a2de079 | 260 | #if 0 |
d662820a | 261 | void |
06c1d900 | 262 | scm_i_remove_weaks_from_weak_vectors () |
d662820a | 263 | { |
06c1d900 MV |
264 | SCM w = weak_vectors; |
265 | while (!scm_is_null (w)) | |
266 | { | |
267 | scm_i_remove_weaks (w); | |
268 | w = SCM_I_WVECT_GC_CHAIN (w); | |
269 | } | |
d662820a | 270 | } |
3a2de079 | 271 | #endif |
d662820a | 272 | |
06c1d900 | 273 | \f |
592996c9 | 274 | |
c35738c1 MD |
275 | SCM |
276 | scm_init_weaks_builtins () | |
277 | { | |
278 | #include "libguile/weaks.x" | |
279 | return SCM_UNSPECIFIED; | |
280 | } | |
281 | ||
0f2d19dd JB |
282 | void |
283 | scm_init_weaks () | |
0f2d19dd | 284 | { |
c35738c1 MD |
285 | scm_c_define_gsubr ("%init-weaks-builtins", 0, 0, 0, |
286 | scm_init_weaks_builtins); | |
0f2d19dd JB |
287 | } |
288 | ||
89e00824 ML |
289 | |
290 | /* | |
291 | Local Variables: | |
292 | c-file-style: "gnu" | |
293 | End: | |
294 | */ |