Commit | Line | Data |
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f86f3b5b | 1 | /* Copyright (C) 1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e | 3 | * This library is free software; you can redistribute it and/or |
53befeb7 NJ |
4 | * modify it under the terms of the GNU Lesser General Public License |
5 | * as published by the Free Software Foundation; either version 3 of | |
6 | * the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
53befeb7 NJ |
8 | * This library is distributed in the hope that it will be useful, but |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
73be1d9e MV |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
53befeb7 NJ |
15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
16 | * 02110-1301 USA | |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
0f2d19dd | 19 | \f |
dbb605f5 | 20 | #ifdef HAVE_CONFIG_H |
a6f7f57d RB |
21 | # include <config.h> |
22 | #endif | |
0f2d19dd | 23 | |
66e78727 AW |
24 | #include <alloca.h> |
25 | ||
a0599745 | 26 | #include "libguile/_scm.h" |
4e047c3e | 27 | #include "libguile/async.h" |
a0599745 MD |
28 | #include "libguile/chars.h" |
29 | #include "libguile/eval.h" | |
30 | #include "libguile/alist.h" | |
31 | #include "libguile/weaks.h" | |
32 | #include "libguile/hashtab.h" | |
33 | #include "libguile/ports.h" | |
34 | #include "libguile/strings.h" | |
27646f41 | 35 | #include "libguile/srfi-13.h" |
a0599745 MD |
36 | |
37 | #include "libguile/validate.h" | |
38 | #include "libguile/struct.h" | |
0f2d19dd | 39 | |
d15ad007 LC |
40 | #include "libguile/eq.h" |
41 | ||
95b88819 GH |
42 | #ifdef HAVE_STRING_H |
43 | #include <string.h> | |
44 | #endif | |
45 | ||
1c44468d | 46 | #include "libguile/bdw-gc.h" |
5e67dc27 | 47 | |
0f2d19dd JB |
48 | \f |
49 | ||
b6cf4d02 AW |
50 | /* A needlessly obscure test. */ |
51 | #define SCM_LAYOUT_TAILP(X) (((X) & 32) == 0) /* R, W or O */ | |
52 | ||
0f2d19dd | 53 | static SCM required_vtable_fields = SCM_BOOL_F; |
b6cf4d02 AW |
54 | static SCM required_applicable_fields = SCM_BOOL_F; |
55 | static SCM required_applicable_with_setter_fields = SCM_BOOL_F; | |
56 | SCM scm_struct_table = SCM_BOOL_F; | |
0f2d19dd JB |
57 | |
58 | \f | |
a1ec6916 | 59 | SCM_DEFINE (scm_make_struct_layout, "make-struct-layout", 1, 0, 0, |
1bbd0b84 | 60 | (SCM fields), |
b380b885 | 61 | "Return a new structure layout object.\n\n" |
7c31152f | 62 | "@var{fields} must be a string made up of pairs of characters\n" |
b380b885 MD |
63 | "strung together. The first character of each pair describes a field\n" |
64 | "type, the second a field protection. Allowed types are 'p' for\n" | |
65 | "GC-protected Scheme data, 'u' for unprotected binary data, and 's' for\n" | |
04323af4 | 66 | "a field that points to the structure itself. Allowed protections\n" |
b6cf4d02 AW |
67 | "are 'w' for mutable fields, 'h' for hidden fields, 'r' for read-only\n" |
68 | "fields, and 'o' for opaque fields.\n\n" | |
69 | "Hidden fields are writable, but they will not consume an initializer arg\n" | |
70 | "passed to @code{make-struct}. They are useful to add slots to a struct\n" | |
71 | "in a way that preserves backward-compatibility with existing calls to\n" | |
72 | "@code{make-struct}, especially for derived vtables.\n\n" | |
73 | "The last field protection specification may be capitalized to indicate\n" | |
74 | "that the field is a tail-array.") | |
1bbd0b84 | 75 | #define FUNC_NAME s_scm_make_struct_layout |
0f2d19dd JB |
76 | { |
77 | SCM new_sym; | |
27646f41 | 78 | scm_t_wchar c; |
2ade72d7 | 79 | |
7f991c7d LC |
80 | SCM_VALIDATE_STRING (1, fields); |
81 | ||
1bbd0b84 | 82 | { /* scope */ |
1be6b49c | 83 | size_t len; |
0f2d19dd JB |
84 | int x; |
85 | ||
cc95e00a | 86 | len = scm_i_string_length (fields); |
2ade72d7 DH |
87 | if (len % 2 == 1) |
88 | SCM_MISC_ERROR ("odd length field specification: ~S", | |
1afff620 | 89 | scm_list_1 (fields)); |
2ade72d7 | 90 | |
0f2d19dd JB |
91 | for (x = 0; x < len; x += 2) |
92 | { | |
27646f41 | 93 | switch (c = scm_i_string_ref (fields, x)) |
0f2d19dd JB |
94 | { |
95 | case 'u': | |
96 | case 'p': | |
97 | #if 0 | |
98 | case 'i': | |
99 | case 'd': | |
100 | #endif | |
101 | case 's': | |
102 | break; | |
103 | default: | |
2ade72d7 | 104 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
27646f41 | 105 | scm_list_1 (SCM_MAKE_CHAR (c))); |
0f2d19dd JB |
106 | } |
107 | ||
27646f41 | 108 | switch (c = scm_i_string_ref (fields, x + 1)) |
0f2d19dd JB |
109 | { |
110 | case 'w': | |
b6cf4d02 | 111 | case 'h': |
27646f41 | 112 | if (scm_i_string_ref (fields, x) == 's') |
2ade72d7 | 113 | SCM_MISC_ERROR ("self fields not writable", SCM_EOL); |
0f2d19dd JB |
114 | case 'r': |
115 | case 'o': | |
116 | break; | |
2c36c351 MD |
117 | case 'R': |
118 | case 'W': | |
119 | case 'O': | |
27646f41 | 120 | if (scm_i_string_ref (fields, x) == 's') |
2ade72d7 DH |
121 | SCM_MISC_ERROR ("self fields not allowed in tail array", |
122 | SCM_EOL); | |
123 | if (x != len - 2) | |
124 | SCM_MISC_ERROR ("tail array field must be last field in layout", | |
125 | SCM_EOL); | |
2c36c351 | 126 | break; |
0f2d19dd | 127 | default: |
2ade72d7 | 128 | SCM_MISC_ERROR ("unrecognized ref specification: ~S", |
27646f41 | 129 | scm_list_1 (SCM_MAKE_CHAR (c))); |
0f2d19dd JB |
130 | } |
131 | #if 0 | |
27646f41 | 132 | if (scm_i_string_ref (fields, x, 'd')) |
0f2d19dd | 133 | { |
27646f41 | 134 | if (!scm_i_string_ref (fields, x+2, '-')) |
2ade72d7 | 135 | SCM_MISC_ERROR ("missing dash field at position ~A", |
e11e83f3 | 136 | scm_list_1 (scm_from_int (x / 2))); |
0f2d19dd JB |
137 | x += 2; |
138 | goto recheck_ref; | |
139 | } | |
140 | #endif | |
141 | } | |
cc95e00a | 142 | new_sym = scm_string_to_symbol (fields); |
0f2d19dd | 143 | } |
8824ac88 MV |
144 | scm_remember_upto_here_1 (fields); |
145 | return new_sym; | |
0f2d19dd | 146 | } |
1bbd0b84 | 147 | #undef FUNC_NAME |
0f2d19dd JB |
148 | |
149 | \f | |
150 | ||
51f66c91 AW |
151 | void |
152 | scm_i_struct_inherit_vtable_magic (SCM vtable, SCM obj) | |
153 | #define FUNC_NAME "%inherit-vtable-magic" | |
154 | { | |
155 | /* Verily, what is the deal here, you ask? Basically, we need to know a couple | |
156 | of properties of structures at runtime. For example, "is this structure a | |
157 | vtable of vtables (a metaclass)?"; also, "is this structure applicable?". | |
158 | Both of these questions also imply a certain layout of the structure. So | |
159 | instead of checking the layout at runtime, what we do is pre-verify the | |
160 | layout -- so that at runtime we can just check the applicable flag and | |
161 | dispatch directly to the Scheme procedure in slot 0. | |
162 | */ | |
163 | SCM olayout; | |
164 | ||
165 | /* verify that obj is a valid vtable */ | |
166 | if (scm_is_false (scm_symbol_p (SCM_VTABLE_LAYOUT (obj)))) | |
167 | scm_misc_error (FUNC_NAME, "invalid layout for new vtable", | |
168 | scm_list_1 (SCM_VTABLE_LAYOUT (obj))); | |
169 | ||
170 | /* if obj's vtable is compatible with the required vtable (class) layout, it | |
171 | is a metaclass */ | |
172 | olayout = scm_symbol_to_string (SCM_VTABLE_LAYOUT (obj)); | |
173 | if (scm_is_true (scm_leq_p (scm_string_length (required_vtable_fields), | |
174 | scm_string_length (olayout))) | |
175 | && scm_is_true (scm_string_eq (olayout, required_vtable_fields, | |
176 | scm_from_size_t (0), | |
177 | scm_string_length (required_vtable_fields), | |
178 | scm_from_size_t (0), | |
179 | scm_string_length (required_vtable_fields)))) | |
180 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VTABLE); | |
181 | ||
182 | /* finally if obj is an applicable class, verify that its vtable is | |
183 | compatible with the required applicable layout */ | |
184 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SETTER_VTABLE)) | |
185 | { | |
186 | if (scm_is_false (scm_string_eq (olayout, required_applicable_with_setter_fields, | |
187 | scm_from_size_t (0), | |
188 | scm_from_size_t (4), | |
189 | scm_from_size_t (0), | |
190 | scm_from_size_t (4)))) | |
191 | scm_misc_error (FUNC_NAME, "invalid applicable-with-setter struct layout", | |
192 | scm_list_1 (olayout)); | |
193 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE | SCM_VTABLE_FLAG_SETTER); | |
194 | } | |
195 | else if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_APPLICABLE_VTABLE)) | |
196 | { | |
197 | if (scm_is_false (scm_string_eq (olayout, required_applicable_fields, | |
198 | scm_from_size_t (0), | |
199 | scm_from_size_t (2), | |
200 | scm_from_size_t (0), | |
201 | scm_from_size_t (2)))) | |
202 | scm_misc_error (FUNC_NAME, "invalid applicable struct layout", | |
203 | scm_list_1 (olayout)); | |
204 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE); | |
205 | } | |
206 | } | |
207 | #undef FUNC_NAME | |
0f2d19dd | 208 | |
1cc91f1b | 209 | |
f7620510 | 210 | static void |
66e78727 AW |
211 | scm_struct_init (SCM handle, SCM layout, size_t n_tail, |
212 | size_t n_inits, scm_t_bits *inits) | |
0f2d19dd | 213 | { |
27646f41 | 214 | scm_t_wchar prot = 0; |
cc95e00a | 215 | int n_fields = scm_i_symbol_length (layout) / 2; |
2c36c351 | 216 | int tailp = 0; |
27646f41 | 217 | int i; |
66e78727 | 218 | size_t inits_idx = 0; |
b6cf4d02 | 219 | scm_t_bits *mem = SCM_STRUCT_DATA (handle); |
d8c40b9f | 220 | |
27646f41 | 221 | i = -2; |
0f2d19dd JB |
222 | while (n_fields) |
223 | { | |
2c36c351 MD |
224 | if (!tailp) |
225 | { | |
27646f41 MG |
226 | i += 2; |
227 | prot = scm_i_symbol_ref (layout, i+1); | |
2c36c351 MD |
228 | if (SCM_LAYOUT_TAILP (prot)) |
229 | { | |
230 | tailp = 1; | |
231 | prot = prot == 'R' ? 'r' : prot == 'W' ? 'w' : 'o'; | |
66e78727 AW |
232 | *mem++ = (scm_t_bits)n_tail; |
233 | n_fields += n_tail - 1; | |
2c36c351 MD |
234 | if (n_fields == 0) |
235 | break; | |
236 | } | |
237 | } | |
27646f41 | 238 | switch (scm_i_symbol_ref (layout, i)) |
0f2d19dd | 239 | { |
0f2d19dd | 240 | case 'u': |
66e78727 | 241 | if ((prot != 'r' && prot != 'w') || inits_idx == n_inits) |
0f2d19dd JB |
242 | *mem = 0; |
243 | else | |
244 | { | |
66e78727 AW |
245 | *mem = scm_to_ulong (SCM_PACK (inits[inits_idx])); |
246 | inits_idx++; | |
0f2d19dd JB |
247 | } |
248 | break; | |
249 | ||
250 | case 'p': | |
66e78727 | 251 | if ((prot != 'r' && prot != 'w') || inits_idx == n_inits) |
d8c40b9f | 252 | *mem = SCM_UNPACK (SCM_BOOL_F); |
0f2d19dd JB |
253 | else |
254 | { | |
66e78727 AW |
255 | *mem = inits[inits_idx]; |
256 | inits_idx++; | |
0f2d19dd JB |
257 | } |
258 | ||
259 | break; | |
260 | ||
0f2d19dd | 261 | case 's': |
d8c40b9f | 262 | *mem = SCM_UNPACK (handle); |
0f2d19dd JB |
263 | break; |
264 | } | |
265 | ||
0f2d19dd JB |
266 | n_fields--; |
267 | mem++; | |
268 | } | |
269 | } | |
270 | ||
271 | ||
a1ec6916 | 272 | SCM_DEFINE (scm_struct_p, "struct?", 1, 0, 0, |
1bbd0b84 | 273 | (SCM x), |
0233bfc1 | 274 | "Return @code{#t} iff @var{x} is a structure object, else\n" |
942e5b91 | 275 | "@code{#f}.") |
1bbd0b84 | 276 | #define FUNC_NAME s_scm_struct_p |
0f2d19dd | 277 | { |
7888309b | 278 | return scm_from_bool(SCM_STRUCTP (x)); |
0f2d19dd | 279 | } |
1bbd0b84 | 280 | #undef FUNC_NAME |
0f2d19dd | 281 | |
a1ec6916 | 282 | SCM_DEFINE (scm_struct_vtable_p, "struct-vtable?", 1, 0, 0, |
1bbd0b84 | 283 | (SCM x), |
0233bfc1 | 284 | "Return @code{#t} iff @var{x} is a vtable structure.") |
1bbd0b84 | 285 | #define FUNC_NAME s_scm_struct_vtable_p |
0f2d19dd | 286 | { |
b6cf4d02 AW |
287 | return scm_from_bool |
288 | (SCM_STRUCTP (x) | |
289 | && SCM_STRUCT_VTABLE_FLAG_IS_SET (x, SCM_VTABLE_FLAG_VTABLE)); | |
0f2d19dd | 290 | } |
1bbd0b84 | 291 | #undef FUNC_NAME |
0f2d19dd | 292 | |
14d1400f | 293 | |
51f66c91 AW |
294 | /* Finalization: invoke the finalizer of the struct pointed to by PTR. */ |
295 | static void | |
296 | struct_finalizer_trampoline (GC_PTR ptr, GC_PTR unused_data) | |
297 | { | |
298 | SCM obj = PTR2SCM (ptr); | |
299 | scm_t_struct_finalize finalize = SCM_STRUCT_FINALIZER (obj); | |
300 | ||
301 | if (finalize) | |
302 | finalize (obj); | |
303 | } | |
304 | ||
14d1400f JB |
305 | /* All struct data must be allocated at an address whose bottom three |
306 | bits are zero. This is because the tag for a struct lives in the | |
307 | bottom three bits of the struct's car, and the upper bits point to | |
308 | the data of its vtable, which is a struct itself. Thus, if the | |
309 | address of that data doesn't end in three zeros, tagging it will | |
310 | destroy the pointer. | |
311 | ||
b6cf4d02 AW |
312 | I suppose we should make it clear here that, the data must be 8-byte aligned, |
313 | *within* the struct, and the struct itself should be 8-byte aligned. In | |
314 | practice we ensure this because the data starts two words into a struct. | |
14d1400f | 315 | |
b6cf4d02 AW |
316 | This function allocates an 8-byte aligned block of memory, whose first word |
317 | points to the given vtable data, then a data pointer, then n_words of data. | |
318 | */ | |
319 | SCM | |
51f66c91 | 320 | scm_i_alloc_struct (scm_t_bits *vtable_data, int n_words, const char *what) |
14d1400f | 321 | { |
b6cf4d02 AW |
322 | scm_t_bits ret; |
323 | ret = (scm_t_bits)scm_gc_malloc (sizeof (scm_t_bits) * (n_words + 2), "struct"); | |
b6cf4d02 AW |
324 | SCM_SET_CELL_WORD_0 (SCM_PACK (ret), (scm_t_bits)vtable_data | scm_tc3_struct); |
325 | SCM_SET_CELL_WORD_1 (SCM_PACK (ret), | |
326 | (scm_t_bits)SCM_CELL_OBJECT_LOC (SCM_PACK (ret), 2)); | |
5e67dc27 | 327 | |
51f66c91 AW |
328 | /* vtable_data can be null when making a vtable vtable */ |
329 | if (vtable_data && vtable_data[scm_vtable_index_instance_finalize]) | |
330 | { | |
331 | /* Register a finalizer for the newly created instance. */ | |
332 | GC_finalization_proc prev_finalizer; | |
333 | GC_PTR prev_finalizer_data; | |
334 | GC_REGISTER_FINALIZER_NO_ORDER ((void*)ret, | |
335 | struct_finalizer_trampoline, | |
336 | NULL, | |
337 | &prev_finalizer, | |
338 | &prev_finalizer_data); | |
339 | } | |
5e67dc27 | 340 | |
51f66c91 | 341 | return SCM_PACK (ret); |
5e67dc27 LC |
342 | } |
343 | ||
5e67dc27 | 344 | \f |
66e78727 AW |
345 | SCM |
346 | scm_c_make_structv (SCM vtable, size_t n_tail, size_t n_init, scm_t_bits *init) | |
347 | #define FUNC_NAME "make-struct" | |
0f2d19dd JB |
348 | { |
349 | SCM layout; | |
a55c2b68 | 350 | size_t basic_size; |
b6cf4d02 | 351 | SCM obj; |
0f2d19dd | 352 | |
34d19ef6 | 353 | SCM_VALIDATE_VTABLE (1, vtable); |
0f2d19dd | 354 | |
b6cf4d02 | 355 | layout = SCM_VTABLE_LAYOUT (vtable); |
cc95e00a | 356 | basic_size = scm_i_symbol_length (layout) / 2; |
651f2cd2 | 357 | |
66e78727 | 358 | if (n_tail != 0) |
651f2cd2 KR |
359 | { |
360 | SCM layout_str, last_char; | |
361 | ||
362 | if (basic_size == 0) | |
363 | { | |
364 | bad_tail: | |
365 | SCM_MISC_ERROR ("tail array not allowed unless layout ends R, W, or O", SCM_EOL); | |
366 | } | |
367 | ||
368 | layout_str = scm_symbol_to_string (layout); | |
369 | last_char = scm_string_ref (layout_str, | |
370 | scm_from_size_t (2 * basic_size - 1)); | |
371 | if (! SCM_LAYOUT_TAILP (SCM_CHAR (last_char))) | |
372 | goto bad_tail; | |
373 | } | |
cb823e63 | 374 | |
66e78727 | 375 | obj = scm_i_alloc_struct (SCM_STRUCT_DATA (vtable), basic_size + n_tail, |
51f66c91 | 376 | "struct"); |
5e67dc27 | 377 | |
66e78727 | 378 | scm_struct_init (obj, layout, n_tail, n_init, init); |
b6cf4d02 | 379 | |
51f66c91 AW |
380 | /* only check things and inherit magic if the layout was passed as an initarg. |
381 | something of a hack, but it's for back-compatibility. */ | |
b6cf4d02 | 382 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_VTABLE) |
b6cf4d02 | 383 | && scm_is_true (SCM_VTABLE_LAYOUT (obj))) |
51f66c91 | 384 | scm_i_struct_inherit_vtable_magic (vtable, obj); |
651f2cd2 | 385 | |
b6cf4d02 | 386 | return obj; |
0f2d19dd | 387 | } |
1bbd0b84 | 388 | #undef FUNC_NAME |
0f2d19dd | 389 | |
66e78727 AW |
390 | SCM |
391 | scm_c_make_struct (SCM vtable, size_t n_tail, size_t n_init, scm_t_bits init, ...) | |
392 | { | |
393 | va_list foo; | |
394 | scm_t_bits *v; | |
395 | size_t i; | |
396 | ||
397 | v = alloca (sizeof (scm_t_bits) * n_init); | |
398 | ||
399 | va_start (foo, init); | |
400 | for (i = 0; i < n_init; i++) | |
401 | { | |
402 | v[i] = init; | |
403 | init = va_arg (foo, scm_t_bits); | |
404 | } | |
405 | va_end (foo); | |
406 | ||
407 | return scm_c_make_structv (vtable, n_tail, n_init, v); | |
408 | } | |
409 | ||
410 | SCM_DEFINE (scm_make_struct, "make-struct", 2, 0, 1, | |
411 | (SCM vtable, SCM tail_array_size, SCM init), | |
412 | "Create a new structure.\n\n" | |
413 | "@var{type} must be a vtable structure (@pxref{Vtables}).\n\n" | |
414 | "@var{tail-elts} must be a non-negative integer. If the layout\n" | |
415 | "specification indicated by @var{type} includes a tail-array,\n" | |
416 | "this is the number of elements allocated to that array.\n\n" | |
417 | "The @var{init1}, @dots{} are optional arguments describing how\n" | |
418 | "successive fields of the structure should be initialized. Only fields\n" | |
419 | "with protection 'r' or 'w' can be initialized, except for fields of\n" | |
420 | "type 's', which are automatically initialized to point to the new\n" | |
421 | "structure itself. Fields with protection 'o' can not be initialized by\n" | |
422 | "Scheme programs.\n\n" | |
423 | "If fewer optional arguments than initializable fields are supplied,\n" | |
424 | "fields of type 'p' get default value #f while fields of type 'u' are\n" | |
425 | "initialized to 0.\n\n" | |
426 | "For more information, see the documentation for @code{make-vtable-vtable}.") | |
427 | #define FUNC_NAME s_scm_make_struct | |
428 | { | |
429 | size_t i, n_init; | |
430 | long ilen; | |
431 | scm_t_bits *v; | |
432 | ||
433 | SCM_VALIDATE_VTABLE (1, vtable); | |
434 | ilen = scm_ilength (init); | |
435 | if (ilen < 0) | |
436 | SCM_MISC_ERROR ("Rest arguments do not form a proper list.", SCM_EOL); | |
437 | ||
438 | n_init = (size_t)ilen; | |
439 | ||
440 | /* best to use alloca, but init could be big, so hack to avoid a possible | |
441 | stack overflow */ | |
442 | if (n_init < 64) | |
443 | v = alloca (n_init * sizeof(scm_t_bits)); | |
444 | else | |
445 | v = scm_gc_malloc (n_init * sizeof(scm_t_bits), "struct"); | |
446 | ||
447 | for (i = 0; i < n_init; i++, init = SCM_CDR (init)) | |
448 | v[i] = SCM_UNPACK (SCM_CAR (init)); | |
449 | ||
450 | return scm_c_make_structv (vtable, scm_to_size_t (tail_array_size), n_init, v); | |
451 | } | |
452 | #undef FUNC_NAME | |
453 | ||
0f2d19dd JB |
454 | |
455 | ||
a1ec6916 | 456 | SCM_DEFINE (scm_make_vtable_vtable, "make-vtable-vtable", 2, 0, 1, |
04323af4 | 457 | (SCM user_fields, SCM tail_array_size, SCM init), |
b380b885 | 458 | "Return a new, self-describing vtable structure.\n\n" |
04323af4 MD |
459 | "@var{user-fields} is a string describing user defined fields of the\n" |
460 | "vtable beginning at index @code{vtable-offset-user}\n" | |
461 | "(see @code{make-struct-layout}).\n\n" | |
b380b885 MD |
462 | "@var{tail-size} specifies the size of the tail-array (if any) of\n" |
463 | "this vtable.\n\n" | |
6386e25c | 464 | "@var{init1}, @dots{} are the optional initializers for the fields of\n" |
04323af4 MD |
465 | "the vtable.\n\n" |
466 | "Vtables have one initializable system field---the struct printer.\n" | |
467 | "This field comes before the user fields in the initializers passed\n" | |
468 | "to @code{make-vtable-vtable} and @code{make-struct}, and thus works as\n" | |
469 | "a third optional argument to @code{make-vtable-vtable} and a fourth to\n" | |
470 | "@code{make-struct} when creating vtables:\n\n" | |
471 | "If the value is a procedure, it will be called instead of the standard\n" | |
472 | "printer whenever a struct described by this vtable is printed.\n" | |
473 | "The procedure will be called with arguments STRUCT and PORT.\n\n" | |
474 | "The structure of a struct is described by a vtable, so the vtable is\n" | |
475 | "in essence the type of the struct. The vtable is itself a struct with\n" | |
476 | "a vtable. This could go on forever if it weren't for the\n" | |
29b4f9fb | 477 | "vtable-vtables which are self-describing vtables, and thus terminate\n" |
04323af4 MD |
478 | "the chain.\n\n" |
479 | "There are several potential ways of using structs, but the standard\n" | |
480 | "one is to use three kinds of structs, together building up a type\n" | |
481 | "sub-system: one vtable-vtable working as the root and one or several\n" | |
482 | "\"types\", each with a set of \"instances\". (The vtable-vtable should be\n" | |
29b4f9fb | 483 | "compared to the class <class> which is the class of itself.)\n\n" |
1e6808ea | 484 | "@lisp\n" |
04323af4 MD |
485 | "(define ball-root (make-vtable-vtable \"pr\" 0))\n\n" |
486 | "(define (make-ball-type ball-color)\n" | |
487 | " (make-struct ball-root 0\n" | |
488 | " (make-struct-layout \"pw\")\n" | |
489 | " (lambda (ball port)\n" | |
490 | " (format port \"#<a ~A ball owned by ~A>\"\n" | |
491 | " (color ball)\n" | |
492 | " (owner ball)))\n" | |
493 | " ball-color))\n" | |
494 | "(define (color ball) (struct-ref (struct-vtable ball) vtable-offset-user))\n" | |
495 | "(define (owner ball) (struct-ref ball 0))\n\n" | |
496 | "(define red (make-ball-type 'red))\n" | |
497 | "(define green (make-ball-type 'green))\n\n" | |
498 | "(define (make-ball type owner) (make-struct type 0 owner))\n\n" | |
499 | "(define ball (make-ball green 'Nisse))\n" | |
500 | "ball @result{} #<a green ball owned by Nisse>\n" | |
9401323e | 501 | "@end lisp") |
1bbd0b84 | 502 | #define FUNC_NAME s_scm_make_vtable_vtable |
0f2d19dd JB |
503 | { |
504 | SCM fields; | |
505 | SCM layout; | |
a55c2b68 | 506 | size_t basic_size; |
66e78727 | 507 | size_t n_tail, i, n_init; |
b6cf4d02 | 508 | SCM obj; |
66e78727 AW |
509 | long ilen; |
510 | scm_t_bits *v; | |
0f2d19dd | 511 | |
d1ca2c64 | 512 | SCM_VALIDATE_STRING (1, user_fields); |
66e78727 AW |
513 | ilen = scm_ilength (init); |
514 | if (ilen < 0) | |
515 | SCM_MISC_ERROR ("Rest arguments do not form a proper list.", SCM_EOL); | |
516 | ||
517 | n_init = (size_t)ilen + 1; /* + 1 for the layout */ | |
518 | ||
519 | /* best to use alloca, but init could be big, so hack to avoid a possible | |
520 | stack overflow */ | |
521 | if (n_init < 64) | |
522 | v = alloca (n_init * sizeof(scm_t_bits)); | |
523 | else | |
524 | v = scm_gc_malloc (n_init * sizeof(scm_t_bits), "struct"); | |
0f2d19dd | 525 | |
1afff620 KN |
526 | fields = scm_string_append (scm_list_2 (required_vtable_fields, |
527 | user_fields)); | |
0f2d19dd | 528 | layout = scm_make_struct_layout (fields); |
cc95e00a | 529 | basic_size = scm_i_symbol_length (layout) / 2; |
66e78727 AW |
530 | n_tail = scm_to_size_t (tail_array_size); |
531 | ||
532 | i = 0; | |
533 | v[i++] = SCM_UNPACK (layout); | |
534 | for (; i < n_init; i++, init = SCM_CDR (init)) | |
535 | v[i] = SCM_UNPACK (SCM_CAR (init)); | |
536 | ||
9de87eea | 537 | SCM_CRITICAL_SECTION_START; |
66e78727 | 538 | obj = scm_i_alloc_struct (NULL, basic_size + n_tail, "struct"); |
b6cf4d02 AW |
539 | /* magic magic magic */ |
540 | SCM_SET_CELL_WORD_0 (obj, (scm_t_bits)SCM_STRUCT_DATA (obj) | scm_tc3_struct); | |
9de87eea | 541 | SCM_CRITICAL_SECTION_END; |
66e78727 | 542 | scm_struct_init (obj, layout, n_tail, n_init, v); |
b6cf4d02 AW |
543 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VTABLE); |
544 | return obj; | |
0f2d19dd | 545 | } |
1bbd0b84 | 546 | #undef FUNC_NAME |
0f2d19dd | 547 | |
d15ad007 | 548 | |
651f2cd2 KR |
549 | static SCM scm_i_vtable_vtable_no_extra_fields; |
550 | ||
551 | SCM_DEFINE (scm_make_vtable, "make-vtable", 1, 1, 0, | |
552 | (SCM fields, SCM printer), | |
553 | "Create a vtable, for creating structures with the given\n" | |
554 | "@var{fields}.\n" | |
555 | "\n" | |
556 | "The optional @var{printer} argument is a function to be called\n" | |
557 | "@code{(@var{printer} struct port)} on the structures created.\n" | |
558 | "It should look at @var{struct} and write to @var{port}.") | |
559 | #define FUNC_NAME s_scm_make_vtable | |
560 | { | |
561 | if (SCM_UNBNDP (printer)) | |
562 | printer = SCM_BOOL_F; | |
563 | ||
564 | return scm_make_struct (scm_i_vtable_vtable_no_extra_fields, SCM_INUM0, | |
565 | scm_list_2 (scm_make_struct_layout (fields), | |
566 | printer)); | |
567 | } | |
568 | #undef FUNC_NAME | |
569 | ||
570 | ||
d15ad007 LC |
571 | /* Return true if S1 and S2 are equal structures, i.e., if their vtable and |
572 | contents are the same. Field protections are honored. Thus, it is an | |
573 | error to test the equality of structures that contain opaque fields. */ | |
574 | SCM | |
575 | scm_i_struct_equalp (SCM s1, SCM s2) | |
576 | #define FUNC_NAME "scm_i_struct_equalp" | |
577 | { | |
578 | SCM vtable1, vtable2, layout; | |
579 | size_t struct_size, field_num; | |
580 | ||
581 | SCM_VALIDATE_STRUCT (1, s1); | |
582 | SCM_VALIDATE_STRUCT (2, s2); | |
583 | ||
584 | vtable1 = SCM_STRUCT_VTABLE (s1); | |
585 | vtable2 = SCM_STRUCT_VTABLE (s2); | |
586 | ||
587 | if (!scm_is_eq (vtable1, vtable2)) | |
588 | return SCM_BOOL_F; | |
589 | ||
590 | layout = SCM_STRUCT_LAYOUT (s1); | |
591 | struct_size = scm_i_symbol_length (layout) / 2; | |
592 | ||
593 | for (field_num = 0; field_num < struct_size; field_num++) | |
594 | { | |
595 | SCM s_field_num; | |
596 | SCM field1, field2; | |
597 | ||
598 | /* We have to use `scm_struct_ref ()' here so that fields are accessed | |
599 | consistently, notably wrt. field types and access rights. */ | |
600 | s_field_num = scm_from_size_t (field_num); | |
601 | field1 = scm_struct_ref (s1, s_field_num); | |
602 | field2 = scm_struct_ref (s2, s_field_num); | |
603 | ||
42ddb3cb LC |
604 | /* Self-referencing fields (type `s') must be skipped to avoid infinite |
605 | recursion. */ | |
606 | if (!(scm_is_eq (field1, s1) && (scm_is_eq (field2, s2)))) | |
607 | if (scm_is_false (scm_equal_p (field1, field2))) | |
608 | return SCM_BOOL_F; | |
d15ad007 LC |
609 | } |
610 | ||
42ddb3cb LC |
611 | /* FIXME: Tail elements should be tested for equality. */ |
612 | ||
d15ad007 LC |
613 | return SCM_BOOL_T; |
614 | } | |
615 | #undef FUNC_NAME | |
616 | ||
617 | ||
0f2d19dd JB |
618 | \f |
619 | ||
620 | ||
a1ec6916 | 621 | SCM_DEFINE (scm_struct_ref, "struct-ref", 2, 0, 0, |
1bbd0b84 | 622 | (SCM handle, SCM pos), |
b6cf4d02 | 623 | "Access the @var{n}th field of @var{struct}.\n\n" |
b380b885 MD |
624 | "If the field is of type 'p', then it can be set to an arbitrary value.\n\n" |
625 | "If the field is of type 'u', then it can only be set to a non-negative\n" | |
626 | "integer value small enough to fit in one machine word.") | |
1bbd0b84 | 627 | #define FUNC_NAME s_scm_struct_ref |
0f2d19dd | 628 | { |
5e840c2e | 629 | SCM answer = SCM_UNDEFINED; |
92c2555f | 630 | scm_t_bits * data; |
0f2d19dd | 631 | SCM layout; |
cc95e00a | 632 | size_t layout_len; |
a55c2b68 | 633 | size_t p; |
92c2555f | 634 | scm_t_bits n_fields; |
27646f41 | 635 | scm_t_wchar field_type = 0; |
0f2d19dd JB |
636 | |
637 | ||
34d19ef6 | 638 | SCM_VALIDATE_STRUCT (1, handle); |
0f2d19dd JB |
639 | |
640 | layout = SCM_STRUCT_LAYOUT (handle); | |
641 | data = SCM_STRUCT_DATA (handle); | |
a55c2b68 | 642 | p = scm_to_size_t (pos); |
0f2d19dd | 643 | |
cc95e00a | 644 | layout_len = scm_i_symbol_length (layout); |
b6cf4d02 AW |
645 | n_fields = layout_len / 2; |
646 | if (SCM_LAYOUT_TAILP (scm_i_symbol_ref (layout, layout_len - 1))) | |
647 | n_fields += data[n_fields - 1]; | |
2c36c351 | 648 | |
34d19ef6 | 649 | SCM_ASSERT_RANGE(1, pos, p < n_fields); |
0f2d19dd | 650 | |
cc95e00a | 651 | if (p * 2 < layout_len) |
2c36c351 | 652 | { |
27646f41 MG |
653 | scm_t_wchar ref; |
654 | field_type = scm_i_symbol_ref (layout, p * 2); | |
655 | ref = scm_i_symbol_ref (layout, p * 2 + 1); | |
b6cf4d02 | 656 | if ((ref != 'r') && (ref != 'w') && (ref != 'h')) |
2c36c351 MD |
657 | { |
658 | if ((ref == 'R') || (ref == 'W')) | |
659 | field_type = 'u'; | |
660 | else | |
1afff620 | 661 | SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos)); |
2c36c351 MD |
662 | } |
663 | } | |
27646f41 MG |
664 | else if (scm_i_symbol_ref (layout, layout_len - 1) != 'O') |
665 | field_type = scm_i_symbol_ref(layout, layout_len - 2); | |
2c36c351 | 666 | else |
1afff620 | 667 | SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos)); |
2c36c351 | 668 | |
0f2d19dd JB |
669 | switch (field_type) |
670 | { | |
671 | case 'u': | |
b9bd8526 | 672 | answer = scm_from_ulong (data[p]); |
0f2d19dd JB |
673 | break; |
674 | ||
675 | #if 0 | |
676 | case 'i': | |
b9bd8526 | 677 | answer = scm_from_long (data[p]); |
0f2d19dd JB |
678 | break; |
679 | ||
680 | case 'd': | |
f8de44c1 | 681 | answer = scm_make_real (*((double *)&(data[p]))); |
0f2d19dd JB |
682 | break; |
683 | #endif | |
684 | ||
685 | case 's': | |
686 | case 'p': | |
d8c40b9f | 687 | answer = SCM_PACK (data[p]); |
0f2d19dd JB |
688 | break; |
689 | ||
690 | ||
691 | default: | |
2ade72d7 | 692 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
1afff620 | 693 | scm_list_1 (SCM_MAKE_CHAR (field_type))); |
0f2d19dd JB |
694 | } |
695 | ||
696 | return answer; | |
697 | } | |
1bbd0b84 | 698 | #undef FUNC_NAME |
0f2d19dd JB |
699 | |
700 | ||
a1ec6916 | 701 | SCM_DEFINE (scm_struct_set_x, "struct-set!", 3, 0, 0, |
1bbd0b84 | 702 | (SCM handle, SCM pos, SCM val), |
e3239868 DH |
703 | "Set the slot of the structure @var{handle} with index @var{pos}\n" |
704 | "to @var{val}. Signal an error if the slot can not be written\n" | |
705 | "to.") | |
1bbd0b84 | 706 | #define FUNC_NAME s_scm_struct_set_x |
0f2d19dd | 707 | { |
92c2555f | 708 | scm_t_bits * data; |
0f2d19dd | 709 | SCM layout; |
cc95e00a | 710 | size_t layout_len; |
a55c2b68 | 711 | size_t p; |
0f2d19dd | 712 | int n_fields; |
27646f41 | 713 | scm_t_wchar field_type = 0; |
0f2d19dd | 714 | |
34d19ef6 | 715 | SCM_VALIDATE_STRUCT (1, handle); |
0f2d19dd JB |
716 | |
717 | layout = SCM_STRUCT_LAYOUT (handle); | |
718 | data = SCM_STRUCT_DATA (handle); | |
a55c2b68 | 719 | p = scm_to_size_t (pos); |
0f2d19dd | 720 | |
cc95e00a | 721 | layout_len = scm_i_symbol_length (layout); |
b6cf4d02 AW |
722 | n_fields = layout_len / 2; |
723 | if (SCM_LAYOUT_TAILP (scm_i_symbol_ref (layout, layout_len - 1))) | |
724 | n_fields += data[n_fields - 1]; | |
0f2d19dd | 725 | |
34d19ef6 | 726 | SCM_ASSERT_RANGE (1, pos, p < n_fields); |
0f2d19dd | 727 | |
cc95e00a | 728 | if (p * 2 < layout_len) |
2c36c351 | 729 | { |
e51fe79c | 730 | char set_x; |
27646f41 MG |
731 | field_type = scm_i_symbol_ref (layout, p * 2); |
732 | set_x = scm_i_symbol_ref (layout, p * 2 + 1); | |
b6cf4d02 | 733 | if (set_x != 'w' && set_x != 'h') |
1afff620 | 734 | SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos)); |
2c36c351 | 735 | } |
27646f41 MG |
736 | else if (scm_i_symbol_ref (layout, layout_len - 1) == 'W') |
737 | field_type = scm_i_symbol_ref (layout, layout_len - 2); | |
2c36c351 | 738 | else |
1afff620 | 739 | SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos)); |
2c36c351 | 740 | |
0f2d19dd JB |
741 | switch (field_type) |
742 | { | |
743 | case 'u': | |
d8c40b9f | 744 | data[p] = SCM_NUM2ULONG (3, val); |
0f2d19dd JB |
745 | break; |
746 | ||
747 | #if 0 | |
748 | case 'i': | |
e4b265d8 | 749 | data[p] = SCM_NUM2LONG (3, val); |
0f2d19dd JB |
750 | break; |
751 | ||
752 | case 'd': | |
753 | *((double *)&(data[p])) = scm_num2dbl (val, (char *)SCM_ARG3); | |
754 | break; | |
755 | #endif | |
756 | ||
757 | case 'p': | |
d8c40b9f | 758 | data[p] = SCM_UNPACK (val); |
0f2d19dd JB |
759 | break; |
760 | ||
761 | case 's': | |
2ade72d7 | 762 | SCM_MISC_ERROR ("self fields immutable", SCM_EOL); |
0f2d19dd JB |
763 | |
764 | default: | |
2ade72d7 | 765 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
1afff620 | 766 | scm_list_1 (SCM_MAKE_CHAR (field_type))); |
0f2d19dd JB |
767 | } |
768 | ||
769 | return val; | |
770 | } | |
1bbd0b84 | 771 | #undef FUNC_NAME |
0f2d19dd JB |
772 | |
773 | ||
a1ec6916 | 774 | SCM_DEFINE (scm_struct_vtable, "struct-vtable", 1, 0, 0, |
1bbd0b84 | 775 | (SCM handle), |
b380b885 | 776 | "Return the vtable structure that describes the type of @var{struct}.") |
1bbd0b84 | 777 | #define FUNC_NAME s_scm_struct_vtable |
0f2d19dd | 778 | { |
34d19ef6 | 779 | SCM_VALIDATE_STRUCT (1, handle); |
0f2d19dd JB |
780 | return SCM_STRUCT_VTABLE (handle); |
781 | } | |
1bbd0b84 | 782 | #undef FUNC_NAME |
0f2d19dd JB |
783 | |
784 | ||
a1ec6916 | 785 | SCM_DEFINE (scm_struct_vtable_tag, "struct-vtable-tag", 1, 0, 0, |
1bbd0b84 | 786 | (SCM handle), |
e3239868 | 787 | "Return the vtable tag of the structure @var{handle}.") |
1bbd0b84 | 788 | #define FUNC_NAME s_scm_struct_vtable_tag |
0f2d19dd | 789 | { |
34d19ef6 | 790 | SCM_VALIDATE_VTABLE (1, handle); |
b9bd8526 | 791 | return scm_from_ulong (((unsigned long)SCM_STRUCT_DATA (handle)) >> 3); |
98d5f601 | 792 | } |
1bbd0b84 | 793 | #undef FUNC_NAME |
98d5f601 MD |
794 | |
795 | /* {Associating names and classes with vtables} | |
796 | * | |
797 | * The name of a vtable should probably be stored as a slot. This is | |
798 | * a backward compatible solution until agreement has been achieved on | |
799 | * how to associate names with vtables. | |
800 | */ | |
801 | ||
c014a02e | 802 | unsigned long |
d587c9e8 | 803 | scm_struct_ihashq (SCM obj, unsigned long n, void *closure) |
98d5f601 | 804 | { |
ad196599 MD |
805 | /* The length of the hash table should be a relative prime it's not |
806 | necessary to shift down the address. */ | |
f1267706 | 807 | return SCM_UNPACK (obj) % n; |
98d5f601 MD |
808 | } |
809 | ||
810 | SCM | |
811 | scm_struct_create_handle (SCM obj) | |
812 | { | |
813 | SCM handle = scm_hash_fn_create_handle_x (scm_struct_table, | |
814 | obj, | |
815 | SCM_BOOL_F, | |
816 | scm_struct_ihashq, | |
d587c9e8 | 817 | (scm_t_assoc_fn) scm_sloppy_assq, |
98d5f601 | 818 | 0); |
7888309b | 819 | if (scm_is_false (SCM_CDR (handle))) |
98d5f601 MD |
820 | SCM_SETCDR (handle, scm_cons (SCM_BOOL_F, SCM_BOOL_F)); |
821 | return handle; | |
822 | } | |
823 | ||
a1ec6916 | 824 | SCM_DEFINE (scm_struct_vtable_name, "struct-vtable-name", 1, 0, 0, |
1bbd0b84 | 825 | (SCM vtable), |
e3239868 | 826 | "Return the name of the vtable @var{vtable}.") |
1bbd0b84 | 827 | #define FUNC_NAME s_scm_struct_vtable_name |
98d5f601 | 828 | { |
34d19ef6 | 829 | SCM_VALIDATE_VTABLE (1, vtable); |
98d5f601 MD |
830 | return SCM_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable))); |
831 | } | |
1bbd0b84 | 832 | #undef FUNC_NAME |
98d5f601 | 833 | |
a1ec6916 | 834 | SCM_DEFINE (scm_set_struct_vtable_name_x, "set-struct-vtable-name!", 2, 0, 0, |
1bbd0b84 | 835 | (SCM vtable, SCM name), |
e3239868 | 836 | "Set the name of the vtable @var{vtable} to @var{name}.") |
1bbd0b84 | 837 | #define FUNC_NAME s_scm_set_struct_vtable_name_x |
98d5f601 | 838 | { |
34d19ef6 HWN |
839 | SCM_VALIDATE_VTABLE (1, vtable); |
840 | SCM_VALIDATE_SYMBOL (2, name); | |
98d5f601 MD |
841 | SCM_SET_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable)), |
842 | name); | |
843 | return SCM_UNSPECIFIED; | |
0f2d19dd | 844 | } |
1bbd0b84 | 845 | #undef FUNC_NAME |
0f2d19dd JB |
846 | |
847 | ||
848 | \f | |
849 | ||
bafcafb2 | 850 | void |
1bbd0b84 | 851 | scm_print_struct (SCM exp, SCM port, scm_print_state *pstate) |
bafcafb2 | 852 | { |
7888309b | 853 | if (scm_is_true (scm_procedure_p (SCM_STRUCT_PRINTER (exp)))) |
4bfdf158 MD |
854 | scm_printer_apply (SCM_STRUCT_PRINTER (exp), exp, port, pstate); |
855 | else | |
bafcafb2 | 856 | { |
a1ae1799 MD |
857 | SCM vtable = SCM_STRUCT_VTABLE (exp); |
858 | SCM name = scm_struct_vtable_name (vtable); | |
859 | scm_puts ("#<", port); | |
7888309b | 860 | if (scm_is_true (name)) |
b6cf4d02 AW |
861 | { |
862 | scm_display (name, port); | |
863 | scm_putc (' ', port); | |
864 | } | |
a1ae1799 | 865 | else |
b6cf4d02 AW |
866 | { |
867 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_VTABLE)) | |
868 | scm_puts ("vtable:", port); | |
869 | else | |
870 | scm_puts ("struct:", port); | |
871 | scm_uintprint (SCM_UNPACK (vtable), 16, port); | |
872 | scm_putc (' ', port); | |
873 | scm_write (SCM_VTABLE_LAYOUT (vtable), port); | |
874 | scm_putc (' ', port); | |
875 | } | |
0345e278 | 876 | scm_uintprint (SCM_UNPACK (exp), 16, port); |
b6cf4d02 AW |
877 | /* hackety hack */ |
878 | if (SCM_STRUCT_APPLICABLE_P (exp)) | |
879 | { | |
880 | if (scm_is_true (SCM_STRUCT_PROCEDURE (exp))) | |
881 | { | |
882 | scm_puts (" proc: ", port); | |
883 | if (scm_is_true (scm_procedure_p (SCM_STRUCT_PROCEDURE (exp)))) | |
884 | scm_write (SCM_STRUCT_PROCEDURE (exp), port); | |
885 | else | |
886 | scm_puts ("(not a procedure?)", port); | |
887 | } | |
888 | if (SCM_STRUCT_SETTER_P (exp)) | |
889 | { | |
890 | scm_puts (" setter: ", port); | |
891 | scm_write (SCM_STRUCT_SETTER (exp), port); | |
892 | } | |
893 | } | |
b7f3516f | 894 | scm_putc ('>', port); |
bafcafb2 | 895 | } |
bafcafb2 | 896 | } |
1cc91f1b | 897 | |
0f2d19dd JB |
898 | void |
899 | scm_init_struct () | |
0f2d19dd | 900 | { |
b6cf4d02 AW |
901 | SCM scm_applicable_struct_vtable_vtable; |
902 | SCM scm_applicable_struct_with_setter_vtable_vtable; | |
903 | ||
904 | GC_REGISTER_DISPLACEMENT (2*sizeof(scm_t_bits)); /* for the self data pointer */ | |
905 | GC_REGISTER_DISPLACEMENT (2*sizeof(scm_t_bits) | |
906 | + scm_tc3_struct); /* for the vtable data pointer */ | |
907 | ||
908 | scm_struct_table = scm_make_weak_key_hash_table (scm_from_int (31)); | |
909 | required_vtable_fields = scm_from_locale_string (SCM_VTABLE_BASE_LAYOUT); | |
910 | required_applicable_fields = scm_from_locale_string (SCM_APPLICABLE_BASE_LAYOUT); | |
911 | required_applicable_with_setter_fields = scm_from_locale_string (SCM_APPLICABLE_WITH_SETTER_BASE_LAYOUT); | |
651f2cd2 KR |
912 | |
913 | scm_i_vtable_vtable_no_extra_fields = | |
b6cf4d02 AW |
914 | scm_make_vtable_vtable (scm_nullstr, SCM_INUM0, SCM_EOL); |
915 | ||
916 | scm_applicable_struct_vtable_vtable = | |
917 | scm_make_struct (scm_i_vtable_vtable_no_extra_fields, SCM_INUM0, | |
918 | scm_list_1 (scm_make_struct_layout (required_vtable_fields))); | |
919 | SCM_SET_VTABLE_FLAGS (scm_applicable_struct_vtable_vtable, | |
920 | SCM_VTABLE_FLAG_APPLICABLE_VTABLE); | |
921 | scm_c_define ("<applicable-struct-vtable>", scm_applicable_struct_vtable_vtable); | |
922 | ||
923 | scm_applicable_struct_with_setter_vtable_vtable = | |
924 | scm_make_struct (scm_i_vtable_vtable_no_extra_fields, SCM_INUM0, | |
925 | scm_list_1 (scm_make_struct_layout (required_vtable_fields))); | |
926 | SCM_SET_VTABLE_FLAGS (scm_applicable_struct_with_setter_vtable_vtable, | |
927 | SCM_VTABLE_FLAG_APPLICABLE_VTABLE | SCM_VTABLE_FLAG_SETTER_VTABLE); | |
928 | scm_c_define ("<applicable-struct-with-setter-vtable>", scm_applicable_struct_with_setter_vtable_vtable); | |
651f2cd2 | 929 | |
e11e83f3 | 930 | scm_c_define ("vtable-index-layout", scm_from_int (scm_vtable_index_layout)); |
86d31dfe | 931 | scm_c_define ("vtable-index-printer", |
b6cf4d02 | 932 | scm_from_int (scm_vtable_index_instance_printer)); |
e11e83f3 | 933 | scm_c_define ("vtable-offset-user", scm_from_int (scm_vtable_offset_user)); |
a0599745 | 934 | #include "libguile/struct.x" |
0f2d19dd | 935 | } |
89e00824 ML |
936 | |
937 | /* | |
938 | Local Variables: | |
939 | c-file-style: "gnu" | |
940 | End: | |
941 | */ |