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 | |
a0599745 | 24 | #include "libguile/_scm.h" |
4e047c3e | 25 | #include "libguile/async.h" |
a0599745 MD |
26 | #include "libguile/chars.h" |
27 | #include "libguile/eval.h" | |
28 | #include "libguile/alist.h" | |
29 | #include "libguile/weaks.h" | |
30 | #include "libguile/hashtab.h" | |
31 | #include "libguile/ports.h" | |
32 | #include "libguile/strings.h" | |
27646f41 | 33 | #include "libguile/srfi-13.h" |
a0599745 MD |
34 | |
35 | #include "libguile/validate.h" | |
36 | #include "libguile/struct.h" | |
0f2d19dd | 37 | |
d15ad007 LC |
38 | #include "libguile/eq.h" |
39 | ||
95b88819 GH |
40 | #ifdef HAVE_STRING_H |
41 | #include <string.h> | |
42 | #endif | |
43 | ||
1c44468d | 44 | #include "libguile/bdw-gc.h" |
5e67dc27 | 45 | |
0f2d19dd JB |
46 | \f |
47 | ||
b6cf4d02 AW |
48 | /* A needlessly obscure test. */ |
49 | #define SCM_LAYOUT_TAILP(X) (((X) & 32) == 0) /* R, W or O */ | |
50 | ||
0f2d19dd | 51 | static SCM required_vtable_fields = SCM_BOOL_F; |
b6cf4d02 AW |
52 | static SCM required_applicable_fields = SCM_BOOL_F; |
53 | static SCM required_applicable_with_setter_fields = SCM_BOOL_F; | |
54 | SCM scm_struct_table = SCM_BOOL_F; | |
0f2d19dd JB |
55 | |
56 | \f | |
a1ec6916 | 57 | SCM_DEFINE (scm_make_struct_layout, "make-struct-layout", 1, 0, 0, |
1bbd0b84 | 58 | (SCM fields), |
b380b885 | 59 | "Return a new structure layout object.\n\n" |
7c31152f | 60 | "@var{fields} must be a string made up of pairs of characters\n" |
b380b885 MD |
61 | "strung together. The first character of each pair describes a field\n" |
62 | "type, the second a field protection. Allowed types are 'p' for\n" | |
63 | "GC-protected Scheme data, 'u' for unprotected binary data, and 's' for\n" | |
04323af4 | 64 | "a field that points to the structure itself. Allowed protections\n" |
b6cf4d02 AW |
65 | "are 'w' for mutable fields, 'h' for hidden fields, 'r' for read-only\n" |
66 | "fields, and 'o' for opaque fields.\n\n" | |
67 | "Hidden fields are writable, but they will not consume an initializer arg\n" | |
68 | "passed to @code{make-struct}. They are useful to add slots to a struct\n" | |
69 | "in a way that preserves backward-compatibility with existing calls to\n" | |
70 | "@code{make-struct}, especially for derived vtables.\n\n" | |
71 | "The last field protection specification may be capitalized to indicate\n" | |
72 | "that the field is a tail-array.") | |
1bbd0b84 | 73 | #define FUNC_NAME s_scm_make_struct_layout |
0f2d19dd JB |
74 | { |
75 | SCM new_sym; | |
27646f41 | 76 | scm_t_wchar c; |
2ade72d7 | 77 | |
7f991c7d LC |
78 | SCM_VALIDATE_STRING (1, fields); |
79 | ||
1bbd0b84 | 80 | { /* scope */ |
1be6b49c | 81 | size_t len; |
0f2d19dd JB |
82 | int x; |
83 | ||
cc95e00a | 84 | len = scm_i_string_length (fields); |
2ade72d7 DH |
85 | if (len % 2 == 1) |
86 | SCM_MISC_ERROR ("odd length field specification: ~S", | |
1afff620 | 87 | scm_list_1 (fields)); |
2ade72d7 | 88 | |
0f2d19dd JB |
89 | for (x = 0; x < len; x += 2) |
90 | { | |
27646f41 | 91 | switch (c = scm_i_string_ref (fields, x)) |
0f2d19dd JB |
92 | { |
93 | case 'u': | |
94 | case 'p': | |
95 | #if 0 | |
96 | case 'i': | |
97 | case 'd': | |
98 | #endif | |
99 | case 's': | |
100 | break; | |
101 | default: | |
2ade72d7 | 102 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
27646f41 | 103 | scm_list_1 (SCM_MAKE_CHAR (c))); |
0f2d19dd JB |
104 | } |
105 | ||
27646f41 | 106 | switch (c = scm_i_string_ref (fields, x + 1)) |
0f2d19dd JB |
107 | { |
108 | case 'w': | |
b6cf4d02 | 109 | case 'h': |
27646f41 | 110 | if (scm_i_string_ref (fields, x) == 's') |
2ade72d7 | 111 | SCM_MISC_ERROR ("self fields not writable", SCM_EOL); |
0f2d19dd JB |
112 | case 'r': |
113 | case 'o': | |
114 | break; | |
2c36c351 MD |
115 | case 'R': |
116 | case 'W': | |
117 | case 'O': | |
27646f41 | 118 | if (scm_i_string_ref (fields, x) == 's') |
2ade72d7 DH |
119 | SCM_MISC_ERROR ("self fields not allowed in tail array", |
120 | SCM_EOL); | |
121 | if (x != len - 2) | |
122 | SCM_MISC_ERROR ("tail array field must be last field in layout", | |
123 | SCM_EOL); | |
2c36c351 | 124 | break; |
0f2d19dd | 125 | default: |
2ade72d7 | 126 | SCM_MISC_ERROR ("unrecognized ref specification: ~S", |
27646f41 | 127 | scm_list_1 (SCM_MAKE_CHAR (c))); |
0f2d19dd JB |
128 | } |
129 | #if 0 | |
27646f41 | 130 | if (scm_i_string_ref (fields, x, 'd')) |
0f2d19dd | 131 | { |
27646f41 | 132 | if (!scm_i_string_ref (fields, x+2, '-')) |
2ade72d7 | 133 | SCM_MISC_ERROR ("missing dash field at position ~A", |
e11e83f3 | 134 | scm_list_1 (scm_from_int (x / 2))); |
0f2d19dd JB |
135 | x += 2; |
136 | goto recheck_ref; | |
137 | } | |
138 | #endif | |
139 | } | |
cc95e00a | 140 | new_sym = scm_string_to_symbol (fields); |
0f2d19dd | 141 | } |
8824ac88 MV |
142 | scm_remember_upto_here_1 (fields); |
143 | return new_sym; | |
0f2d19dd | 144 | } |
1bbd0b84 | 145 | #undef FUNC_NAME |
0f2d19dd JB |
146 | |
147 | \f | |
148 | ||
51f66c91 AW |
149 | void |
150 | scm_i_struct_inherit_vtable_magic (SCM vtable, SCM obj) | |
151 | #define FUNC_NAME "%inherit-vtable-magic" | |
152 | { | |
153 | /* Verily, what is the deal here, you ask? Basically, we need to know a couple | |
154 | of properties of structures at runtime. For example, "is this structure a | |
155 | vtable of vtables (a metaclass)?"; also, "is this structure applicable?". | |
156 | Both of these questions also imply a certain layout of the structure. So | |
157 | instead of checking the layout at runtime, what we do is pre-verify the | |
158 | layout -- so that at runtime we can just check the applicable flag and | |
159 | dispatch directly to the Scheme procedure in slot 0. | |
160 | */ | |
161 | SCM olayout; | |
162 | ||
163 | /* verify that obj is a valid vtable */ | |
164 | if (scm_is_false (scm_symbol_p (SCM_VTABLE_LAYOUT (obj)))) | |
165 | scm_misc_error (FUNC_NAME, "invalid layout for new vtable", | |
166 | scm_list_1 (SCM_VTABLE_LAYOUT (obj))); | |
167 | ||
168 | /* if obj's vtable is compatible with the required vtable (class) layout, it | |
169 | is a metaclass */ | |
170 | olayout = scm_symbol_to_string (SCM_VTABLE_LAYOUT (obj)); | |
171 | if (scm_is_true (scm_leq_p (scm_string_length (required_vtable_fields), | |
172 | scm_string_length (olayout))) | |
173 | && scm_is_true (scm_string_eq (olayout, required_vtable_fields, | |
174 | scm_from_size_t (0), | |
175 | scm_string_length (required_vtable_fields), | |
176 | scm_from_size_t (0), | |
177 | scm_string_length (required_vtable_fields)))) | |
178 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VTABLE); | |
179 | ||
180 | /* finally if obj is an applicable class, verify that its vtable is | |
181 | compatible with the required applicable layout */ | |
182 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SETTER_VTABLE)) | |
183 | { | |
184 | if (scm_is_false (scm_string_eq (olayout, required_applicable_with_setter_fields, | |
185 | scm_from_size_t (0), | |
186 | scm_from_size_t (4), | |
187 | scm_from_size_t (0), | |
188 | scm_from_size_t (4)))) | |
189 | scm_misc_error (FUNC_NAME, "invalid applicable-with-setter struct layout", | |
190 | scm_list_1 (olayout)); | |
191 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE | SCM_VTABLE_FLAG_SETTER); | |
192 | } | |
193 | else if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_APPLICABLE_VTABLE)) | |
194 | { | |
195 | if (scm_is_false (scm_string_eq (olayout, required_applicable_fields, | |
196 | scm_from_size_t (0), | |
197 | scm_from_size_t (2), | |
198 | scm_from_size_t (0), | |
199 | scm_from_size_t (2)))) | |
200 | scm_misc_error (FUNC_NAME, "invalid applicable struct layout", | |
201 | scm_list_1 (olayout)); | |
202 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE); | |
203 | } | |
204 | } | |
205 | #undef FUNC_NAME | |
0f2d19dd | 206 | |
1cc91f1b | 207 | |
f7620510 | 208 | static void |
b6cf4d02 | 209 | scm_struct_init (SCM handle, SCM layout, int tail_elts, SCM inits) |
0f2d19dd | 210 | { |
27646f41 | 211 | scm_t_wchar prot = 0; |
cc95e00a | 212 | int n_fields = scm_i_symbol_length (layout) / 2; |
2c36c351 | 213 | int tailp = 0; |
27646f41 | 214 | int i; |
b6cf4d02 | 215 | scm_t_bits *mem = SCM_STRUCT_DATA (handle); |
d8c40b9f | 216 | |
27646f41 | 217 | i = -2; |
0f2d19dd JB |
218 | while (n_fields) |
219 | { | |
2c36c351 MD |
220 | if (!tailp) |
221 | { | |
27646f41 MG |
222 | i += 2; |
223 | prot = scm_i_symbol_ref (layout, i+1); | |
2c36c351 MD |
224 | if (SCM_LAYOUT_TAILP (prot)) |
225 | { | |
226 | tailp = 1; | |
227 | prot = prot == 'R' ? 'r' : prot == 'W' ? 'w' : 'o'; | |
d8c40b9f | 228 | *mem++ = tail_elts; |
2c36c351 MD |
229 | n_fields += tail_elts - 1; |
230 | if (n_fields == 0) | |
231 | break; | |
232 | } | |
233 | } | |
27646f41 | 234 | switch (scm_i_symbol_ref (layout, i)) |
0f2d19dd JB |
235 | { |
236 | #if 0 | |
237 | case 'i': | |
2c36c351 | 238 | if ((prot != 'r' && prot != 'w') || inits == SCM_EOL) |
0f2d19dd JB |
239 | *mem = 0; |
240 | else | |
241 | { | |
b9bd8526 | 242 | *mem = scm_to_long (SCM_CAR (inits)); |
0f2d19dd JB |
243 | inits = SCM_CDR (inits); |
244 | } | |
245 | break; | |
246 | #endif | |
247 | ||
248 | case 'u': | |
d2e53ed6 | 249 | if ((prot != 'r' && prot != 'w') || scm_is_null (inits)) |
0f2d19dd JB |
250 | *mem = 0; |
251 | else | |
252 | { | |
b9bd8526 | 253 | *mem = scm_to_ulong (SCM_CAR (inits)); |
0f2d19dd JB |
254 | inits = SCM_CDR (inits); |
255 | } | |
256 | break; | |
257 | ||
258 | case 'p': | |
d2e53ed6 | 259 | if ((prot != 'r' && prot != 'w') || scm_is_null (inits)) |
d8c40b9f | 260 | *mem = SCM_UNPACK (SCM_BOOL_F); |
0f2d19dd JB |
261 | else |
262 | { | |
d8c40b9f | 263 | *mem = SCM_UNPACK (SCM_CAR (inits)); |
0f2d19dd JB |
264 | inits = SCM_CDR (inits); |
265 | } | |
266 | ||
267 | break; | |
268 | ||
269 | #if 0 | |
270 | case 'd': | |
2c36c351 | 271 | if ((prot != 'r' && prot != 'w') || inits == SCM_EOL) |
0f2d19dd JB |
272 | *((double *)mem) = 0.0; |
273 | else | |
274 | { | |
a5bfe84d | 275 | *mem = scm_num2dbl (SCM_CAR (inits), "scm_struct_init"); |
0f2d19dd JB |
276 | inits = SCM_CDR (inits); |
277 | } | |
278 | fields_desc += 2; | |
279 | break; | |
280 | #endif | |
281 | ||
282 | case 's': | |
d8c40b9f | 283 | *mem = SCM_UNPACK (handle); |
0f2d19dd JB |
284 | break; |
285 | } | |
286 | ||
0f2d19dd JB |
287 | n_fields--; |
288 | mem++; | |
289 | } | |
290 | } | |
291 | ||
292 | ||
a1ec6916 | 293 | SCM_DEFINE (scm_struct_p, "struct?", 1, 0, 0, |
1bbd0b84 | 294 | (SCM x), |
0233bfc1 | 295 | "Return @code{#t} iff @var{x} is a structure object, else\n" |
942e5b91 | 296 | "@code{#f}.") |
1bbd0b84 | 297 | #define FUNC_NAME s_scm_struct_p |
0f2d19dd | 298 | { |
7888309b | 299 | return scm_from_bool(SCM_STRUCTP (x)); |
0f2d19dd | 300 | } |
1bbd0b84 | 301 | #undef FUNC_NAME |
0f2d19dd | 302 | |
a1ec6916 | 303 | SCM_DEFINE (scm_struct_vtable_p, "struct-vtable?", 1, 0, 0, |
1bbd0b84 | 304 | (SCM x), |
0233bfc1 | 305 | "Return @code{#t} iff @var{x} is a vtable structure.") |
1bbd0b84 | 306 | #define FUNC_NAME s_scm_struct_vtable_p |
0f2d19dd | 307 | { |
b6cf4d02 AW |
308 | return scm_from_bool |
309 | (SCM_STRUCTP (x) | |
310 | && SCM_STRUCT_VTABLE_FLAG_IS_SET (x, SCM_VTABLE_FLAG_VTABLE)); | |
0f2d19dd | 311 | } |
1bbd0b84 | 312 | #undef FUNC_NAME |
0f2d19dd | 313 | |
14d1400f | 314 | |
51f66c91 AW |
315 | /* Finalization: invoke the finalizer of the struct pointed to by PTR. */ |
316 | static void | |
317 | struct_finalizer_trampoline (GC_PTR ptr, GC_PTR unused_data) | |
318 | { | |
319 | SCM obj = PTR2SCM (ptr); | |
320 | scm_t_struct_finalize finalize = SCM_STRUCT_FINALIZER (obj); | |
321 | ||
322 | if (finalize) | |
323 | finalize (obj); | |
324 | } | |
325 | ||
14d1400f JB |
326 | /* All struct data must be allocated at an address whose bottom three |
327 | bits are zero. This is because the tag for a struct lives in the | |
328 | bottom three bits of the struct's car, and the upper bits point to | |
329 | the data of its vtable, which is a struct itself. Thus, if the | |
330 | address of that data doesn't end in three zeros, tagging it will | |
331 | destroy the pointer. | |
332 | ||
b6cf4d02 AW |
333 | I suppose we should make it clear here that, the data must be 8-byte aligned, |
334 | *within* the struct, and the struct itself should be 8-byte aligned. In | |
335 | practice we ensure this because the data starts two words into a struct. | |
14d1400f | 336 | |
b6cf4d02 AW |
337 | This function allocates an 8-byte aligned block of memory, whose first word |
338 | points to the given vtable data, then a data pointer, then n_words of data. | |
339 | */ | |
340 | SCM | |
51f66c91 | 341 | scm_i_alloc_struct (scm_t_bits *vtable_data, int n_words, const char *what) |
14d1400f | 342 | { |
b6cf4d02 AW |
343 | scm_t_bits ret; |
344 | ret = (scm_t_bits)scm_gc_malloc (sizeof (scm_t_bits) * (n_words + 2), "struct"); | |
b6cf4d02 AW |
345 | SCM_SET_CELL_WORD_0 (SCM_PACK (ret), (scm_t_bits)vtable_data | scm_tc3_struct); |
346 | SCM_SET_CELL_WORD_1 (SCM_PACK (ret), | |
347 | (scm_t_bits)SCM_CELL_OBJECT_LOC (SCM_PACK (ret), 2)); | |
5e67dc27 | 348 | |
51f66c91 AW |
349 | /* vtable_data can be null when making a vtable vtable */ |
350 | if (vtable_data && vtable_data[scm_vtable_index_instance_finalize]) | |
351 | { | |
352 | /* Register a finalizer for the newly created instance. */ | |
353 | GC_finalization_proc prev_finalizer; | |
354 | GC_PTR prev_finalizer_data; | |
355 | GC_REGISTER_FINALIZER_NO_ORDER ((void*)ret, | |
356 | struct_finalizer_trampoline, | |
357 | NULL, | |
358 | &prev_finalizer, | |
359 | &prev_finalizer_data); | |
360 | } | |
5e67dc27 | 361 | |
51f66c91 | 362 | return SCM_PACK (ret); |
5e67dc27 LC |
363 | } |
364 | ||
5e67dc27 | 365 | \f |
a1ec6916 | 366 | SCM_DEFINE (scm_make_struct, "make-struct", 2, 0, 1, |
1bbd0b84 | 367 | (SCM vtable, SCM tail_array_size, SCM init), |
b380b885 | 368 | "Create a new structure.\n\n" |
1bee0e70 | 369 | "@var{type} must be a vtable structure (@pxref{Vtables}).\n\n" |
b380b885 MD |
370 | "@var{tail-elts} must be a non-negative integer. If the layout\n" |
371 | "specification indicated by @var{type} includes a tail-array,\n" | |
372 | "this is the number of elements allocated to that array.\n\n" | |
6386e25c | 373 | "The @var{init1}, @dots{} are optional arguments describing how\n" |
04323af4 MD |
374 | "successive fields of the structure should be initialized. Only fields\n" |
375 | "with protection 'r' or 'w' can be initialized, except for fields of\n" | |
376 | "type 's', which are automatically initialized to point to the new\n" | |
b6cf4d02 | 377 | "structure itself. Fields with protection 'o' can not be initialized by\n" |
04323af4 MD |
378 | "Scheme programs.\n\n" |
379 | "If fewer optional arguments than initializable fields are supplied,\n" | |
380 | "fields of type 'p' get default value #f while fields of type 'u' are\n" | |
381 | "initialized to 0.\n\n" | |
6386e25c | 382 | "For more information, see the documentation for @code{make-vtable-vtable}.") |
1bbd0b84 | 383 | #define FUNC_NAME s_scm_make_struct |
0f2d19dd JB |
384 | { |
385 | SCM layout; | |
a55c2b68 MV |
386 | size_t basic_size; |
387 | size_t tail_elts; | |
b6cf4d02 | 388 | SCM obj; |
0f2d19dd | 389 | |
34d19ef6 | 390 | SCM_VALIDATE_VTABLE (1, vtable); |
af45e3b0 | 391 | SCM_VALIDATE_REST_ARGUMENT (init); |
0f2d19dd | 392 | |
b6cf4d02 | 393 | layout = SCM_VTABLE_LAYOUT (vtable); |
cc95e00a | 394 | basic_size = scm_i_symbol_length (layout) / 2; |
a55c2b68 | 395 | tail_elts = scm_to_size_t (tail_array_size); |
651f2cd2 KR |
396 | |
397 | /* A tail array is only allowed if the layout fields string ends in "R", | |
398 | "W" or "O". */ | |
399 | if (tail_elts != 0) | |
400 | { | |
401 | SCM layout_str, last_char; | |
402 | ||
403 | if (basic_size == 0) | |
404 | { | |
405 | bad_tail: | |
406 | SCM_MISC_ERROR ("tail array not allowed unless layout ends R, W, or O", SCM_EOL); | |
407 | } | |
408 | ||
409 | layout_str = scm_symbol_to_string (layout); | |
410 | last_char = scm_string_ref (layout_str, | |
411 | scm_from_size_t (2 * basic_size - 1)); | |
412 | if (! SCM_LAYOUT_TAILP (SCM_CHAR (last_char))) | |
413 | goto bad_tail; | |
414 | } | |
cb823e63 | 415 | |
51f66c91 AW |
416 | obj = scm_i_alloc_struct (SCM_STRUCT_DATA (vtable), basic_size + tail_elts, |
417 | "struct"); | |
5e67dc27 | 418 | |
b6cf4d02 AW |
419 | scm_struct_init (obj, layout, tail_elts, init); |
420 | ||
51f66c91 AW |
421 | /* only check things and inherit magic if the layout was passed as an initarg. |
422 | something of a hack, but it's for back-compatibility. */ | |
b6cf4d02 | 423 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_VTABLE) |
b6cf4d02 | 424 | && scm_is_true (SCM_VTABLE_LAYOUT (obj))) |
51f66c91 | 425 | scm_i_struct_inherit_vtable_magic (vtable, obj); |
651f2cd2 | 426 | |
b6cf4d02 | 427 | return obj; |
0f2d19dd | 428 | } |
1bbd0b84 | 429 | #undef FUNC_NAME |
0f2d19dd JB |
430 | |
431 | ||
432 | ||
a1ec6916 | 433 | SCM_DEFINE (scm_make_vtable_vtable, "make-vtable-vtable", 2, 0, 1, |
04323af4 | 434 | (SCM user_fields, SCM tail_array_size, SCM init), |
b380b885 | 435 | "Return a new, self-describing vtable structure.\n\n" |
04323af4 MD |
436 | "@var{user-fields} is a string describing user defined fields of the\n" |
437 | "vtable beginning at index @code{vtable-offset-user}\n" | |
438 | "(see @code{make-struct-layout}).\n\n" | |
b380b885 MD |
439 | "@var{tail-size} specifies the size of the tail-array (if any) of\n" |
440 | "this vtable.\n\n" | |
6386e25c | 441 | "@var{init1}, @dots{} are the optional initializers for the fields of\n" |
04323af4 MD |
442 | "the vtable.\n\n" |
443 | "Vtables have one initializable system field---the struct printer.\n" | |
444 | "This field comes before the user fields in the initializers passed\n" | |
445 | "to @code{make-vtable-vtable} and @code{make-struct}, and thus works as\n" | |
446 | "a third optional argument to @code{make-vtable-vtable} and a fourth to\n" | |
447 | "@code{make-struct} when creating vtables:\n\n" | |
448 | "If the value is a procedure, it will be called instead of the standard\n" | |
449 | "printer whenever a struct described by this vtable is printed.\n" | |
450 | "The procedure will be called with arguments STRUCT and PORT.\n\n" | |
451 | "The structure of a struct is described by a vtable, so the vtable is\n" | |
452 | "in essence the type of the struct. The vtable is itself a struct with\n" | |
453 | "a vtable. This could go on forever if it weren't for the\n" | |
29b4f9fb | 454 | "vtable-vtables which are self-describing vtables, and thus terminate\n" |
04323af4 MD |
455 | "the chain.\n\n" |
456 | "There are several potential ways of using structs, but the standard\n" | |
457 | "one is to use three kinds of structs, together building up a type\n" | |
458 | "sub-system: one vtable-vtable working as the root and one or several\n" | |
459 | "\"types\", each with a set of \"instances\". (The vtable-vtable should be\n" | |
29b4f9fb | 460 | "compared to the class <class> which is the class of itself.)\n\n" |
1e6808ea | 461 | "@lisp\n" |
04323af4 MD |
462 | "(define ball-root (make-vtable-vtable \"pr\" 0))\n\n" |
463 | "(define (make-ball-type ball-color)\n" | |
464 | " (make-struct ball-root 0\n" | |
465 | " (make-struct-layout \"pw\")\n" | |
466 | " (lambda (ball port)\n" | |
467 | " (format port \"#<a ~A ball owned by ~A>\"\n" | |
468 | " (color ball)\n" | |
469 | " (owner ball)))\n" | |
470 | " ball-color))\n" | |
471 | "(define (color ball) (struct-ref (struct-vtable ball) vtable-offset-user))\n" | |
472 | "(define (owner ball) (struct-ref ball 0))\n\n" | |
473 | "(define red (make-ball-type 'red))\n" | |
474 | "(define green (make-ball-type 'green))\n\n" | |
475 | "(define (make-ball type owner) (make-struct type 0 owner))\n\n" | |
476 | "(define ball (make-ball green 'Nisse))\n" | |
477 | "ball @result{} #<a green ball owned by Nisse>\n" | |
9401323e | 478 | "@end lisp") |
1bbd0b84 | 479 | #define FUNC_NAME s_scm_make_vtable_vtable |
0f2d19dd JB |
480 | { |
481 | SCM fields; | |
482 | SCM layout; | |
a55c2b68 MV |
483 | size_t basic_size; |
484 | size_t tail_elts; | |
b6cf4d02 | 485 | SCM obj; |
0f2d19dd | 486 | |
d1ca2c64 | 487 | SCM_VALIDATE_STRING (1, user_fields); |
af45e3b0 | 488 | SCM_VALIDATE_REST_ARGUMENT (init); |
0f2d19dd | 489 | |
1afff620 KN |
490 | fields = scm_string_append (scm_list_2 (required_vtable_fields, |
491 | user_fields)); | |
0f2d19dd | 492 | layout = scm_make_struct_layout (fields); |
cc95e00a | 493 | basic_size = scm_i_symbol_length (layout) / 2; |
a55c2b68 | 494 | tail_elts = scm_to_size_t (tail_array_size); |
9de87eea | 495 | SCM_CRITICAL_SECTION_START; |
51f66c91 | 496 | obj = scm_i_alloc_struct (NULL, basic_size + tail_elts, "struct"); |
b6cf4d02 AW |
497 | /* magic magic magic */ |
498 | SCM_SET_CELL_WORD_0 (obj, (scm_t_bits)SCM_STRUCT_DATA (obj) | scm_tc3_struct); | |
9de87eea | 499 | SCM_CRITICAL_SECTION_END; |
b6cf4d02 AW |
500 | scm_struct_init (obj, layout, tail_elts, scm_cons (layout, init)); |
501 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VTABLE); | |
502 | return obj; | |
0f2d19dd | 503 | } |
1bbd0b84 | 504 | #undef FUNC_NAME |
0f2d19dd | 505 | |
d15ad007 | 506 | |
651f2cd2 KR |
507 | static SCM scm_i_vtable_vtable_no_extra_fields; |
508 | ||
509 | SCM_DEFINE (scm_make_vtable, "make-vtable", 1, 1, 0, | |
510 | (SCM fields, SCM printer), | |
511 | "Create a vtable, for creating structures with the given\n" | |
512 | "@var{fields}.\n" | |
513 | "\n" | |
514 | "The optional @var{printer} argument is a function to be called\n" | |
515 | "@code{(@var{printer} struct port)} on the structures created.\n" | |
516 | "It should look at @var{struct} and write to @var{port}.") | |
517 | #define FUNC_NAME s_scm_make_vtable | |
518 | { | |
519 | if (SCM_UNBNDP (printer)) | |
520 | printer = SCM_BOOL_F; | |
521 | ||
522 | return scm_make_struct (scm_i_vtable_vtable_no_extra_fields, SCM_INUM0, | |
523 | scm_list_2 (scm_make_struct_layout (fields), | |
524 | printer)); | |
525 | } | |
526 | #undef FUNC_NAME | |
527 | ||
528 | ||
d15ad007 LC |
529 | /* Return true if S1 and S2 are equal structures, i.e., if their vtable and |
530 | contents are the same. Field protections are honored. Thus, it is an | |
531 | error to test the equality of structures that contain opaque fields. */ | |
532 | SCM | |
533 | scm_i_struct_equalp (SCM s1, SCM s2) | |
534 | #define FUNC_NAME "scm_i_struct_equalp" | |
535 | { | |
536 | SCM vtable1, vtable2, layout; | |
537 | size_t struct_size, field_num; | |
538 | ||
539 | SCM_VALIDATE_STRUCT (1, s1); | |
540 | SCM_VALIDATE_STRUCT (2, s2); | |
541 | ||
542 | vtable1 = SCM_STRUCT_VTABLE (s1); | |
543 | vtable2 = SCM_STRUCT_VTABLE (s2); | |
544 | ||
545 | if (!scm_is_eq (vtable1, vtable2)) | |
546 | return SCM_BOOL_F; | |
547 | ||
548 | layout = SCM_STRUCT_LAYOUT (s1); | |
549 | struct_size = scm_i_symbol_length (layout) / 2; | |
550 | ||
551 | for (field_num = 0; field_num < struct_size; field_num++) | |
552 | { | |
553 | SCM s_field_num; | |
554 | SCM field1, field2; | |
555 | ||
556 | /* We have to use `scm_struct_ref ()' here so that fields are accessed | |
557 | consistently, notably wrt. field types and access rights. */ | |
558 | s_field_num = scm_from_size_t (field_num); | |
559 | field1 = scm_struct_ref (s1, s_field_num); | |
560 | field2 = scm_struct_ref (s2, s_field_num); | |
561 | ||
42ddb3cb LC |
562 | /* Self-referencing fields (type `s') must be skipped to avoid infinite |
563 | recursion. */ | |
564 | if (!(scm_is_eq (field1, s1) && (scm_is_eq (field2, s2)))) | |
565 | if (scm_is_false (scm_equal_p (field1, field2))) | |
566 | return SCM_BOOL_F; | |
d15ad007 LC |
567 | } |
568 | ||
42ddb3cb LC |
569 | /* FIXME: Tail elements should be tested for equality. */ |
570 | ||
d15ad007 LC |
571 | return SCM_BOOL_T; |
572 | } | |
573 | #undef FUNC_NAME | |
574 | ||
575 | ||
0f2d19dd JB |
576 | \f |
577 | ||
578 | ||
a1ec6916 | 579 | SCM_DEFINE (scm_struct_ref, "struct-ref", 2, 0, 0, |
1bbd0b84 | 580 | (SCM handle, SCM pos), |
b6cf4d02 | 581 | "Access the @var{n}th field of @var{struct}.\n\n" |
b380b885 MD |
582 | "If the field is of type 'p', then it can be set to an arbitrary value.\n\n" |
583 | "If the field is of type 'u', then it can only be set to a non-negative\n" | |
584 | "integer value small enough to fit in one machine word.") | |
1bbd0b84 | 585 | #define FUNC_NAME s_scm_struct_ref |
0f2d19dd | 586 | { |
5e840c2e | 587 | SCM answer = SCM_UNDEFINED; |
92c2555f | 588 | scm_t_bits * data; |
0f2d19dd | 589 | SCM layout; |
cc95e00a | 590 | size_t layout_len; |
a55c2b68 | 591 | size_t p; |
92c2555f | 592 | scm_t_bits n_fields; |
27646f41 | 593 | scm_t_wchar field_type = 0; |
0f2d19dd JB |
594 | |
595 | ||
34d19ef6 | 596 | SCM_VALIDATE_STRUCT (1, handle); |
0f2d19dd JB |
597 | |
598 | layout = SCM_STRUCT_LAYOUT (handle); | |
599 | data = SCM_STRUCT_DATA (handle); | |
a55c2b68 | 600 | p = scm_to_size_t (pos); |
0f2d19dd | 601 | |
cc95e00a | 602 | layout_len = scm_i_symbol_length (layout); |
b6cf4d02 AW |
603 | n_fields = layout_len / 2; |
604 | if (SCM_LAYOUT_TAILP (scm_i_symbol_ref (layout, layout_len - 1))) | |
605 | n_fields += data[n_fields - 1]; | |
2c36c351 | 606 | |
34d19ef6 | 607 | SCM_ASSERT_RANGE(1, pos, p < n_fields); |
0f2d19dd | 608 | |
cc95e00a | 609 | if (p * 2 < layout_len) |
2c36c351 | 610 | { |
27646f41 MG |
611 | scm_t_wchar ref; |
612 | field_type = scm_i_symbol_ref (layout, p * 2); | |
613 | ref = scm_i_symbol_ref (layout, p * 2 + 1); | |
b6cf4d02 | 614 | if ((ref != 'r') && (ref != 'w') && (ref != 'h')) |
2c36c351 MD |
615 | { |
616 | if ((ref == 'R') || (ref == 'W')) | |
617 | field_type = 'u'; | |
618 | else | |
1afff620 | 619 | SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos)); |
2c36c351 MD |
620 | } |
621 | } | |
27646f41 MG |
622 | else if (scm_i_symbol_ref (layout, layout_len - 1) != 'O') |
623 | field_type = scm_i_symbol_ref(layout, layout_len - 2); | |
2c36c351 | 624 | else |
1afff620 | 625 | SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos)); |
2c36c351 | 626 | |
0f2d19dd JB |
627 | switch (field_type) |
628 | { | |
629 | case 'u': | |
b9bd8526 | 630 | answer = scm_from_ulong (data[p]); |
0f2d19dd JB |
631 | break; |
632 | ||
633 | #if 0 | |
634 | case 'i': | |
b9bd8526 | 635 | answer = scm_from_long (data[p]); |
0f2d19dd JB |
636 | break; |
637 | ||
638 | case 'd': | |
f8de44c1 | 639 | answer = scm_make_real (*((double *)&(data[p]))); |
0f2d19dd JB |
640 | break; |
641 | #endif | |
642 | ||
643 | case 's': | |
644 | case 'p': | |
d8c40b9f | 645 | answer = SCM_PACK (data[p]); |
0f2d19dd JB |
646 | break; |
647 | ||
648 | ||
649 | default: | |
2ade72d7 | 650 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
1afff620 | 651 | scm_list_1 (SCM_MAKE_CHAR (field_type))); |
0f2d19dd JB |
652 | } |
653 | ||
654 | return answer; | |
655 | } | |
1bbd0b84 | 656 | #undef FUNC_NAME |
0f2d19dd JB |
657 | |
658 | ||
a1ec6916 | 659 | SCM_DEFINE (scm_struct_set_x, "struct-set!", 3, 0, 0, |
1bbd0b84 | 660 | (SCM handle, SCM pos, SCM val), |
e3239868 DH |
661 | "Set the slot of the structure @var{handle} with index @var{pos}\n" |
662 | "to @var{val}. Signal an error if the slot can not be written\n" | |
663 | "to.") | |
1bbd0b84 | 664 | #define FUNC_NAME s_scm_struct_set_x |
0f2d19dd | 665 | { |
92c2555f | 666 | scm_t_bits * data; |
0f2d19dd | 667 | SCM layout; |
cc95e00a | 668 | size_t layout_len; |
a55c2b68 | 669 | size_t p; |
0f2d19dd | 670 | int n_fields; |
27646f41 | 671 | scm_t_wchar field_type = 0; |
0f2d19dd | 672 | |
34d19ef6 | 673 | SCM_VALIDATE_STRUCT (1, handle); |
0f2d19dd JB |
674 | |
675 | layout = SCM_STRUCT_LAYOUT (handle); | |
676 | data = SCM_STRUCT_DATA (handle); | |
a55c2b68 | 677 | p = scm_to_size_t (pos); |
0f2d19dd | 678 | |
cc95e00a | 679 | layout_len = scm_i_symbol_length (layout); |
b6cf4d02 AW |
680 | n_fields = layout_len / 2; |
681 | if (SCM_LAYOUT_TAILP (scm_i_symbol_ref (layout, layout_len - 1))) | |
682 | n_fields += data[n_fields - 1]; | |
0f2d19dd | 683 | |
34d19ef6 | 684 | SCM_ASSERT_RANGE (1, pos, p < n_fields); |
0f2d19dd | 685 | |
cc95e00a | 686 | if (p * 2 < layout_len) |
2c36c351 | 687 | { |
e51fe79c | 688 | char set_x; |
27646f41 MG |
689 | field_type = scm_i_symbol_ref (layout, p * 2); |
690 | set_x = scm_i_symbol_ref (layout, p * 2 + 1); | |
b6cf4d02 | 691 | if (set_x != 'w' && set_x != 'h') |
1afff620 | 692 | SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos)); |
2c36c351 | 693 | } |
27646f41 MG |
694 | else if (scm_i_symbol_ref (layout, layout_len - 1) == 'W') |
695 | field_type = scm_i_symbol_ref (layout, layout_len - 2); | |
2c36c351 | 696 | else |
1afff620 | 697 | SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos)); |
2c36c351 | 698 | |
0f2d19dd JB |
699 | switch (field_type) |
700 | { | |
701 | case 'u': | |
d8c40b9f | 702 | data[p] = SCM_NUM2ULONG (3, val); |
0f2d19dd JB |
703 | break; |
704 | ||
705 | #if 0 | |
706 | case 'i': | |
e4b265d8 | 707 | data[p] = SCM_NUM2LONG (3, val); |
0f2d19dd JB |
708 | break; |
709 | ||
710 | case 'd': | |
711 | *((double *)&(data[p])) = scm_num2dbl (val, (char *)SCM_ARG3); | |
712 | break; | |
713 | #endif | |
714 | ||
715 | case 'p': | |
d8c40b9f | 716 | data[p] = SCM_UNPACK (val); |
0f2d19dd JB |
717 | break; |
718 | ||
719 | case 's': | |
2ade72d7 | 720 | SCM_MISC_ERROR ("self fields immutable", SCM_EOL); |
0f2d19dd JB |
721 | |
722 | default: | |
2ade72d7 | 723 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
1afff620 | 724 | scm_list_1 (SCM_MAKE_CHAR (field_type))); |
0f2d19dd JB |
725 | } |
726 | ||
727 | return val; | |
728 | } | |
1bbd0b84 | 729 | #undef FUNC_NAME |
0f2d19dd JB |
730 | |
731 | ||
a1ec6916 | 732 | SCM_DEFINE (scm_struct_vtable, "struct-vtable", 1, 0, 0, |
1bbd0b84 | 733 | (SCM handle), |
b380b885 | 734 | "Return the vtable structure that describes the type of @var{struct}.") |
1bbd0b84 | 735 | #define FUNC_NAME s_scm_struct_vtable |
0f2d19dd | 736 | { |
34d19ef6 | 737 | SCM_VALIDATE_STRUCT (1, handle); |
0f2d19dd JB |
738 | return SCM_STRUCT_VTABLE (handle); |
739 | } | |
1bbd0b84 | 740 | #undef FUNC_NAME |
0f2d19dd JB |
741 | |
742 | ||
a1ec6916 | 743 | SCM_DEFINE (scm_struct_vtable_tag, "struct-vtable-tag", 1, 0, 0, |
1bbd0b84 | 744 | (SCM handle), |
e3239868 | 745 | "Return the vtable tag of the structure @var{handle}.") |
1bbd0b84 | 746 | #define FUNC_NAME s_scm_struct_vtable_tag |
0f2d19dd | 747 | { |
34d19ef6 | 748 | SCM_VALIDATE_VTABLE (1, handle); |
b9bd8526 | 749 | return scm_from_ulong (((unsigned long)SCM_STRUCT_DATA (handle)) >> 3); |
98d5f601 | 750 | } |
1bbd0b84 | 751 | #undef FUNC_NAME |
98d5f601 MD |
752 | |
753 | /* {Associating names and classes with vtables} | |
754 | * | |
755 | * The name of a vtable should probably be stored as a slot. This is | |
756 | * a backward compatible solution until agreement has been achieved on | |
757 | * how to associate names with vtables. | |
758 | */ | |
759 | ||
c014a02e | 760 | unsigned long |
d587c9e8 | 761 | scm_struct_ihashq (SCM obj, unsigned long n, void *closure) |
98d5f601 | 762 | { |
ad196599 MD |
763 | /* The length of the hash table should be a relative prime it's not |
764 | necessary to shift down the address. */ | |
f1267706 | 765 | return SCM_UNPACK (obj) % n; |
98d5f601 MD |
766 | } |
767 | ||
768 | SCM | |
769 | scm_struct_create_handle (SCM obj) | |
770 | { | |
771 | SCM handle = scm_hash_fn_create_handle_x (scm_struct_table, | |
772 | obj, | |
773 | SCM_BOOL_F, | |
774 | scm_struct_ihashq, | |
d587c9e8 | 775 | (scm_t_assoc_fn) scm_sloppy_assq, |
98d5f601 | 776 | 0); |
7888309b | 777 | if (scm_is_false (SCM_CDR (handle))) |
98d5f601 MD |
778 | SCM_SETCDR (handle, scm_cons (SCM_BOOL_F, SCM_BOOL_F)); |
779 | return handle; | |
780 | } | |
781 | ||
a1ec6916 | 782 | SCM_DEFINE (scm_struct_vtable_name, "struct-vtable-name", 1, 0, 0, |
1bbd0b84 | 783 | (SCM vtable), |
e3239868 | 784 | "Return the name of the vtable @var{vtable}.") |
1bbd0b84 | 785 | #define FUNC_NAME s_scm_struct_vtable_name |
98d5f601 | 786 | { |
34d19ef6 | 787 | SCM_VALIDATE_VTABLE (1, vtable); |
98d5f601 MD |
788 | return SCM_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable))); |
789 | } | |
1bbd0b84 | 790 | #undef FUNC_NAME |
98d5f601 | 791 | |
a1ec6916 | 792 | SCM_DEFINE (scm_set_struct_vtable_name_x, "set-struct-vtable-name!", 2, 0, 0, |
1bbd0b84 | 793 | (SCM vtable, SCM name), |
e3239868 | 794 | "Set the name of the vtable @var{vtable} to @var{name}.") |
1bbd0b84 | 795 | #define FUNC_NAME s_scm_set_struct_vtable_name_x |
98d5f601 | 796 | { |
34d19ef6 HWN |
797 | SCM_VALIDATE_VTABLE (1, vtable); |
798 | SCM_VALIDATE_SYMBOL (2, name); | |
98d5f601 MD |
799 | SCM_SET_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable)), |
800 | name); | |
801 | return SCM_UNSPECIFIED; | |
0f2d19dd | 802 | } |
1bbd0b84 | 803 | #undef FUNC_NAME |
0f2d19dd JB |
804 | |
805 | ||
806 | \f | |
807 | ||
bafcafb2 | 808 | void |
1bbd0b84 | 809 | scm_print_struct (SCM exp, SCM port, scm_print_state *pstate) |
bafcafb2 | 810 | { |
7888309b | 811 | if (scm_is_true (scm_procedure_p (SCM_STRUCT_PRINTER (exp)))) |
4bfdf158 MD |
812 | scm_printer_apply (SCM_STRUCT_PRINTER (exp), exp, port, pstate); |
813 | else | |
bafcafb2 | 814 | { |
a1ae1799 MD |
815 | SCM vtable = SCM_STRUCT_VTABLE (exp); |
816 | SCM name = scm_struct_vtable_name (vtable); | |
817 | scm_puts ("#<", port); | |
7888309b | 818 | if (scm_is_true (name)) |
b6cf4d02 AW |
819 | { |
820 | scm_display (name, port); | |
821 | scm_putc (' ', port); | |
822 | } | |
a1ae1799 | 823 | else |
b6cf4d02 AW |
824 | { |
825 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_VTABLE)) | |
826 | scm_puts ("vtable:", port); | |
827 | else | |
828 | scm_puts ("struct:", port); | |
829 | scm_uintprint (SCM_UNPACK (vtable), 16, port); | |
830 | scm_putc (' ', port); | |
831 | scm_write (SCM_VTABLE_LAYOUT (vtable), port); | |
832 | scm_putc (' ', port); | |
833 | } | |
0345e278 | 834 | scm_uintprint (SCM_UNPACK (exp), 16, port); |
b6cf4d02 AW |
835 | /* hackety hack */ |
836 | if (SCM_STRUCT_APPLICABLE_P (exp)) | |
837 | { | |
838 | if (scm_is_true (SCM_STRUCT_PROCEDURE (exp))) | |
839 | { | |
840 | scm_puts (" proc: ", port); | |
841 | if (scm_is_true (scm_procedure_p (SCM_STRUCT_PROCEDURE (exp)))) | |
842 | scm_write (SCM_STRUCT_PROCEDURE (exp), port); | |
843 | else | |
844 | scm_puts ("(not a procedure?)", port); | |
845 | } | |
846 | if (SCM_STRUCT_SETTER_P (exp)) | |
847 | { | |
848 | scm_puts (" setter: ", port); | |
849 | scm_write (SCM_STRUCT_SETTER (exp), port); | |
850 | } | |
851 | } | |
b7f3516f | 852 | scm_putc ('>', port); |
bafcafb2 | 853 | } |
bafcafb2 | 854 | } |
1cc91f1b | 855 | |
0f2d19dd JB |
856 | void |
857 | scm_init_struct () | |
0f2d19dd | 858 | { |
b6cf4d02 AW |
859 | SCM scm_applicable_struct_vtable_vtable; |
860 | SCM scm_applicable_struct_with_setter_vtable_vtable; | |
861 | ||
862 | GC_REGISTER_DISPLACEMENT (2*sizeof(scm_t_bits)); /* for the self data pointer */ | |
863 | GC_REGISTER_DISPLACEMENT (2*sizeof(scm_t_bits) | |
864 | + scm_tc3_struct); /* for the vtable data pointer */ | |
865 | ||
866 | scm_struct_table = scm_make_weak_key_hash_table (scm_from_int (31)); | |
867 | required_vtable_fields = scm_from_locale_string (SCM_VTABLE_BASE_LAYOUT); | |
868 | required_applicable_fields = scm_from_locale_string (SCM_APPLICABLE_BASE_LAYOUT); | |
869 | required_applicable_with_setter_fields = scm_from_locale_string (SCM_APPLICABLE_WITH_SETTER_BASE_LAYOUT); | |
651f2cd2 KR |
870 | |
871 | scm_i_vtable_vtable_no_extra_fields = | |
b6cf4d02 AW |
872 | scm_make_vtable_vtable (scm_nullstr, SCM_INUM0, SCM_EOL); |
873 | ||
874 | scm_applicable_struct_vtable_vtable = | |
875 | scm_make_struct (scm_i_vtable_vtable_no_extra_fields, SCM_INUM0, | |
876 | scm_list_1 (scm_make_struct_layout (required_vtable_fields))); | |
877 | SCM_SET_VTABLE_FLAGS (scm_applicable_struct_vtable_vtable, | |
878 | SCM_VTABLE_FLAG_APPLICABLE_VTABLE); | |
879 | scm_c_define ("<applicable-struct-vtable>", scm_applicable_struct_vtable_vtable); | |
880 | ||
881 | scm_applicable_struct_with_setter_vtable_vtable = | |
882 | scm_make_struct (scm_i_vtable_vtable_no_extra_fields, SCM_INUM0, | |
883 | scm_list_1 (scm_make_struct_layout (required_vtable_fields))); | |
884 | SCM_SET_VTABLE_FLAGS (scm_applicable_struct_with_setter_vtable_vtable, | |
885 | SCM_VTABLE_FLAG_APPLICABLE_VTABLE | SCM_VTABLE_FLAG_SETTER_VTABLE); | |
886 | scm_c_define ("<applicable-struct-with-setter-vtable>", scm_applicable_struct_with_setter_vtable_vtable); | |
651f2cd2 | 887 | |
e11e83f3 | 888 | scm_c_define ("vtable-index-layout", scm_from_int (scm_vtable_index_layout)); |
86d31dfe | 889 | scm_c_define ("vtable-index-printer", |
b6cf4d02 | 890 | scm_from_int (scm_vtable_index_instance_printer)); |
e11e83f3 | 891 | scm_c_define ("vtable-offset-user", scm_from_int (scm_vtable_offset_user)); |
a0599745 | 892 | #include "libguile/struct.x" |
0f2d19dd | 893 | } |
89e00824 ML |
894 | |
895 | /* | |
896 | Local Variables: | |
897 | c-file-style: "gnu" | |
898 | End: | |
899 | */ |