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8dee1541 | 1 | /* Copyright (C) 1996, 97, 98, 99, 2000 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, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE 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 the GUILE 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 the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, 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 them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, 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 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd JB |
45 | \f |
46 | ||
47 | #include <stdio.h> | |
48 | #include "_scm.h" | |
20e6290e | 49 | #include "chars.h" |
bafcafb2 | 50 | #include "genio.h" |
916d65b1 | 51 | #include "eval.h" |
98d5f601 MD |
52 | #include "alist.h" |
53 | #include "weaks.h" | |
54 | #include "hashtab.h" | |
20e6290e | 55 | |
b6791b2e | 56 | #include "validate.h" |
20e6290e | 57 | #include "struct.h" |
0f2d19dd | 58 | |
95b88819 GH |
59 | #ifdef HAVE_STRING_H |
60 | #include <string.h> | |
61 | #endif | |
62 | ||
0f2d19dd JB |
63 | \f |
64 | ||
65 | static SCM required_vtable_fields = SCM_BOOL_F; | |
98d5f601 | 66 | SCM scm_struct_table; |
0f2d19dd JB |
67 | |
68 | \f | |
a1ec6916 | 69 | SCM_DEFINE (scm_make_struct_layout, "make-struct-layout", 1, 0, 0, |
1bbd0b84 | 70 | (SCM fields), |
b380b885 MD |
71 | "Return a new structure layout object.\n\n" |
72 | "@var{fields} must be a read-only string made up of pairs of characters\n" | |
73 | "strung together. The first character of each pair describes a field\n" | |
74 | "type, the second a field protection. Allowed types are 'p' for\n" | |
75 | "GC-protected Scheme data, 'u' for unprotected binary data, and 's' for\n" | |
76 | "fields that should point to the structure itself. Allowed protections\n" | |
77 | "are 'w' for mutable fields, 'r' for read-only fields, and 'o' for opaque \n" | |
78 | "fields. The last field protection specification may be capitalized to\n" | |
79 | "indicate that the field is a tail-array.") | |
1bbd0b84 | 80 | #define FUNC_NAME s_scm_make_struct_layout |
0f2d19dd JB |
81 | { |
82 | SCM new_sym; | |
3b3b36dd | 83 | SCM_VALIDATE_ROSTRING (1,fields); |
1bbd0b84 | 84 | { /* scope */ |
0f2d19dd JB |
85 | char * field_desc; |
86 | int len; | |
87 | int x; | |
88 | ||
89 | len = SCM_ROLENGTH (fields); | |
90 | field_desc = SCM_ROCHARS (fields); | |
1bbd0b84 | 91 | SCM_ASSERT (!(len & 1), fields, "odd length field specification", FUNC_NAME); |
0f2d19dd JB |
92 | |
93 | for (x = 0; x < len; x += 2) | |
94 | { | |
95 | switch (field_desc[x]) | |
96 | { | |
97 | case 'u': | |
98 | case 'p': | |
99 | #if 0 | |
100 | case 'i': | |
101 | case 'd': | |
102 | #endif | |
103 | case 's': | |
104 | break; | |
105 | default: | |
7866a09b | 106 | SCM_ASSERT (0, SCM_MAKE_CHAR (field_desc[x]) , "unrecognized field type", FUNC_NAME); |
0f2d19dd JB |
107 | } |
108 | ||
109 | switch (field_desc[x + 1]) | |
110 | { | |
111 | case 'w': | |
7866a09b | 112 | SCM_ASSERT (field_desc[x] != 's', SCM_MAKE_CHAR (field_desc[x + 1]), |
1bbd0b84 | 113 | "self fields not writable", FUNC_NAME); |
0f2d19dd JB |
114 | |
115 | case 'r': | |
116 | case 'o': | |
117 | break; | |
2c36c351 MD |
118 | case 'R': |
119 | case 'W': | |
120 | case 'O': | |
7866a09b | 121 | SCM_ASSERT (field_desc[x] != 's', SCM_MAKE_CHAR (field_desc[x + 1]), |
2c36c351 | 122 | "self fields not allowed in tail array", |
1bbd0b84 | 123 | FUNC_NAME); |
7866a09b | 124 | SCM_ASSERT (x == len - 2, SCM_MAKE_CHAR (field_desc[x + 1]), |
2c36c351 | 125 | "tail array field must be last field in layout", |
1bbd0b84 | 126 | FUNC_NAME); |
2c36c351 | 127 | break; |
0f2d19dd | 128 | default: |
7866a09b | 129 | SCM_ASSERT (0, SCM_MAKE_CHAR (field_desc[x]) , "unrecognized ref specification", FUNC_NAME); |
0f2d19dd JB |
130 | } |
131 | #if 0 | |
132 | if (field_desc[x] == 'd') | |
133 | { | |
1bbd0b84 | 134 | SCM_ASSERT (field_desc[x + 2] == '-', SCM_MAKINUM (x / 2), "missing dash field", FUNC_NAME); |
0f2d19dd JB |
135 | x += 2; |
136 | goto recheck_ref; | |
137 | } | |
138 | #endif | |
139 | } | |
140 | new_sym = SCM_CAR (scm_intern_obarray (field_desc, len, SCM_BOOL_F)); | |
141 | } | |
142 | return scm_return_first (new_sym, fields); | |
143 | } | |
1bbd0b84 | 144 | #undef FUNC_NAME |
0f2d19dd JB |
145 | |
146 | \f | |
147 | ||
148 | ||
1cc91f1b | 149 | |
a5bfe84d | 150 | void |
1bbd0b84 | 151 | scm_struct_init (SCM handle, int tail_elts, SCM inits) |
0f2d19dd JB |
152 | { |
153 | SCM layout; | |
154 | SCM * data; | |
155 | unsigned char * fields_desc; | |
35de7ebe | 156 | unsigned char prot = 0; |
0f2d19dd JB |
157 | int n_fields; |
158 | SCM * mem; | |
2c36c351 MD |
159 | int tailp = 0; |
160 | ||
0f2d19dd JB |
161 | layout = SCM_STRUCT_LAYOUT (handle); |
162 | data = SCM_STRUCT_DATA (handle); | |
2c36c351 | 163 | fields_desc = (unsigned char *) SCM_CHARS (layout) - 2; |
0f2d19dd JB |
164 | n_fields = SCM_LENGTH (layout) / 2; |
165 | mem = SCM_STRUCT_DATA (handle); | |
166 | while (n_fields) | |
167 | { | |
2c36c351 MD |
168 | if (!tailp) |
169 | { | |
170 | fields_desc += 2; | |
171 | prot = fields_desc[1]; | |
172 | if (SCM_LAYOUT_TAILP (prot)) | |
173 | { | |
174 | tailp = 1; | |
175 | prot = prot == 'R' ? 'r' : prot == 'W' ? 'w' : 'o'; | |
413cb56f | 176 | *mem++ = SCM_SCM (tail_elts); |
2c36c351 MD |
177 | n_fields += tail_elts - 1; |
178 | if (n_fields == 0) | |
179 | break; | |
180 | } | |
181 | } | |
182 | ||
0f2d19dd JB |
183 | switch (*fields_desc) |
184 | { | |
185 | #if 0 | |
186 | case 'i': | |
2c36c351 | 187 | if ((prot != 'r' && prot != 'w') || inits == SCM_EOL) |
0f2d19dd JB |
188 | *mem = 0; |
189 | else | |
190 | { | |
a5bfe84d | 191 | *mem = scm_num2long (SCM_CAR (inits), SCM_ARGn, "scm_struct_init"); |
0f2d19dd JB |
192 | inits = SCM_CDR (inits); |
193 | } | |
194 | break; | |
195 | #endif | |
196 | ||
197 | case 'u': | |
2c36c351 | 198 | if ((prot != 'r' && prot != 'w') || inits == SCM_EOL) |
0f2d19dd JB |
199 | *mem = 0; |
200 | else | |
201 | { | |
413cb56f | 202 | *mem = SCM_SCM (scm_num2ulong (SCM_CAR (inits), |
8dee1541 MD |
203 | SCM_ARGn, |
204 | "scm_struct_init")); | |
0f2d19dd JB |
205 | inits = SCM_CDR (inits); |
206 | } | |
207 | break; | |
208 | ||
209 | case 'p': | |
2c36c351 | 210 | if ((prot != 'r' && prot != 'w') || inits == SCM_EOL) |
916d65b1 | 211 | *mem = SCM_BOOL_F; |
0f2d19dd JB |
212 | else |
213 | { | |
214 | *mem = SCM_CAR (inits); | |
215 | inits = SCM_CDR (inits); | |
216 | } | |
217 | ||
218 | break; | |
219 | ||
220 | #if 0 | |
221 | case 'd': | |
2c36c351 | 222 | if ((prot != 'r' && prot != 'w') || inits == SCM_EOL) |
0f2d19dd JB |
223 | *((double *)mem) = 0.0; |
224 | else | |
225 | { | |
a5bfe84d | 226 | *mem = scm_num2dbl (SCM_CAR (inits), "scm_struct_init"); |
0f2d19dd JB |
227 | inits = SCM_CDR (inits); |
228 | } | |
229 | fields_desc += 2; | |
230 | break; | |
231 | #endif | |
232 | ||
233 | case 's': | |
234 | *mem = handle; | |
235 | break; | |
236 | } | |
237 | ||
0f2d19dd JB |
238 | n_fields--; |
239 | mem++; | |
240 | } | |
241 | } | |
242 | ||
243 | ||
a1ec6916 | 244 | SCM_DEFINE (scm_struct_p, "struct?", 1, 0, 0, |
1bbd0b84 | 245 | (SCM x), |
b380b885 | 246 | "Return #t iff @var{obj} is a structure object, else #f.") |
1bbd0b84 | 247 | #define FUNC_NAME s_scm_struct_p |
0f2d19dd | 248 | { |
0c95b57d | 249 | return SCM_BOOL(SCM_STRUCTP (x)); |
0f2d19dd | 250 | } |
1bbd0b84 | 251 | #undef FUNC_NAME |
0f2d19dd | 252 | |
a1ec6916 | 253 | SCM_DEFINE (scm_struct_vtable_p, "struct-vtable?", 1, 0, 0, |
1bbd0b84 | 254 | (SCM x), |
b380b885 | 255 | "Return #t iff obj is a vtable structure.") |
1bbd0b84 | 256 | #define FUNC_NAME s_scm_struct_vtable_p |
0f2d19dd JB |
257 | { |
258 | SCM layout; | |
259 | SCM * mem; | |
260 | ||
261 | if (SCM_IMP (x)) | |
262 | return SCM_BOOL_F; | |
263 | ||
264 | if (!SCM_STRUCTP (x)) | |
265 | return SCM_BOOL_F; | |
266 | ||
267 | layout = SCM_STRUCT_LAYOUT (x); | |
268 | ||
269 | if (SCM_LENGTH (layout) < SCM_LENGTH (required_vtable_fields)) | |
270 | return SCM_BOOL_F; | |
271 | ||
272 | if (strncmp (SCM_CHARS (layout), SCM_CHARS (required_vtable_fields), | |
273 | SCM_LENGTH (required_vtable_fields))) | |
274 | return SCM_BOOL_F; | |
275 | ||
276 | mem = SCM_STRUCT_DATA (x); | |
277 | ||
278 | if (mem[1] != 0) | |
279 | return SCM_BOOL_F; | |
280 | ||
281 | if (SCM_IMP (mem[0])) | |
282 | return SCM_BOOL_F; | |
283 | ||
1bbd0b84 | 284 | return SCM_BOOL(SCM_SYMBOLP (mem[0])); |
0f2d19dd | 285 | } |
1bbd0b84 | 286 | #undef FUNC_NAME |
0f2d19dd | 287 | |
14d1400f JB |
288 | |
289 | /* All struct data must be allocated at an address whose bottom three | |
290 | bits are zero. This is because the tag for a struct lives in the | |
291 | bottom three bits of the struct's car, and the upper bits point to | |
292 | the data of its vtable, which is a struct itself. Thus, if the | |
293 | address of that data doesn't end in three zeros, tagging it will | |
294 | destroy the pointer. | |
295 | ||
296 | This function allocates a block of memory, and returns a pointer at | |
297 | least scm_struct_n_extra_words words into the block. Furthermore, | |
298 | it guarantees that that pointer's least three significant bits are | |
299 | all zero. | |
300 | ||
301 | The argument n_words should be the number of words that should | |
302 | appear after the returned address. (That is, it shouldn't include | |
303 | scm_struct_n_extra_words.) | |
304 | ||
305 | This function initializes the following fields of the struct: | |
306 | ||
ad196599 | 307 | scm_struct_i_ptr --- the actual start of the block of memory; the |
14d1400f JB |
308 | address you should pass to 'free' to dispose of the block. |
309 | This field allows us to both guarantee that the returned | |
310 | address is divisible by eight, and allow the GC to free the | |
311 | block. | |
312 | ||
313 | scm_struct_i_n_words --- the number of words allocated to the | |
314 | block, including the extra fields. This is used by the GC. | |
315 | ||
14d1400f JB |
316 | Ugh. */ |
317 | ||
318 | ||
a5bfe84d MD |
319 | SCM * |
320 | scm_alloc_struct (int n_words, int n_extra, char *who) | |
14d1400f | 321 | { |
a5bfe84d | 322 | int size = sizeof (SCM) * (n_words + n_extra) + 7; |
14d1400f JB |
323 | SCM *block = (SCM *) scm_must_malloc (size, who); |
324 | ||
325 | /* Adjust the pointer to hide the extra words. */ | |
a5bfe84d | 326 | SCM *p = block + n_extra; |
14d1400f JB |
327 | |
328 | /* Adjust it even further so it's aligned on an eight-byte boundary. */ | |
4d45e7b6 | 329 | p = (SCM *) (((scm_bits_t) SCM_BITS (p) + 7) & ~7); |
14d1400f | 330 | |
ad196599 MD |
331 | /* Initialize a few fields as described above. */ |
332 | p[scm_struct_i_free] = (SCM) scm_struct_free_standard; | |
14d1400f | 333 | p[scm_struct_i_ptr] = (SCM) block; |
ad196599 MD |
334 | p[scm_struct_i_n_words] = (SCM) n_words; |
335 | p[scm_struct_i_flags] = 0; | |
14d1400f JB |
336 | |
337 | return p; | |
338 | } | |
339 | ||
97056309 | 340 | scm_sizet |
ad196599 MD |
341 | scm_struct_free_0 (SCM *vtable, SCM *data) |
342 | { | |
343 | return 0; | |
344 | } | |
345 | ||
97056309 | 346 | scm_sizet |
ad196599 MD |
347 | scm_struct_free_light (SCM *vtable, SCM *data) |
348 | { | |
349 | free (data); | |
413cb56f | 350 | return SCM_BITS (vtable[scm_struct_i_size]) & ~SCM_STRUCTF_MASK; |
ad196599 MD |
351 | } |
352 | ||
97056309 | 353 | scm_sizet |
ad196599 MD |
354 | scm_struct_free_standard (SCM *vtable, SCM *data) |
355 | { | |
413cb56f | 356 | size_t n = ((SCM_BITS (data[scm_struct_i_n_words]) + scm_struct_n_extra_words) |
ad196599 MD |
357 | * sizeof (SCM) + 7); |
358 | free ((void *) data[scm_struct_i_ptr]); | |
359 | return n; | |
360 | } | |
361 | ||
97056309 | 362 | scm_sizet |
ad196599 MD |
363 | scm_struct_free_entity (SCM *vtable, SCM *data) |
364 | { | |
413cb56f | 365 | size_t n = (SCM_BITS(data[scm_struct_i_n_words] + scm_struct_entity_n_extra_words) |
ad196599 MD |
366 | * sizeof (SCM) + 7); |
367 | free ((void *) data[scm_struct_i_ptr]); | |
368 | return n; | |
369 | } | |
14d1400f | 370 | |
a1ec6916 | 371 | SCM_DEFINE (scm_make_struct, "make-struct", 2, 0, 1, |
1bbd0b84 | 372 | (SCM vtable, SCM tail_array_size, SCM init), |
b380b885 MD |
373 | "Create a new structure.\n\n" |
374 | "@var{type} must be a vtable structure (@xref{Vtables}).\n\n" | |
375 | "@var{tail-elts} must be a non-negative integer. If the layout\n" | |
376 | "specification indicated by @var{type} includes a tail-array,\n" | |
377 | "this is the number of elements allocated to that array.\n\n" | |
378 | "The @var{inits} are optional arguments describing how successive fields\n" | |
379 | "of the structure should be initialized. Only fields with protection 'r'\n" | |
380 | "or 'w' can be initialized -- fields of protection 's' are automatically\n" | |
381 | "initialized to point to the new structure itself; fields of protection 'o'\n" | |
382 | "can not be initialized by Scheme programs.") | |
1bbd0b84 | 383 | #define FUNC_NAME s_scm_make_struct |
0f2d19dd JB |
384 | { |
385 | SCM layout; | |
386 | int basic_size; | |
387 | int tail_elts; | |
388 | SCM * data; | |
389 | SCM handle; | |
390 | ||
3b3b36dd GB |
391 | SCM_VALIDATE_VTABLE (1,vtable); |
392 | SCM_VALIDATE_INUM (2,tail_array_size); | |
0f2d19dd | 393 | |
4bfdf158 | 394 | layout = SCM_STRUCT_DATA (vtable)[scm_vtable_index_layout]; |
0f2d19dd JB |
395 | basic_size = SCM_LENGTH (layout) / 2; |
396 | tail_elts = SCM_INUM (tail_array_size); | |
397 | SCM_NEWCELL (handle); | |
398 | SCM_DEFER_INTS; | |
413cb56f | 399 | if (SCM_BITS (SCM_STRUCT_DATA (vtable)[scm_struct_i_flags]) & SCM_STRUCTF_ENTITY) |
a5bfe84d MD |
400 | { |
401 | data = scm_alloc_struct (basic_size + tail_elts, | |
98d5f601 | 402 | scm_struct_entity_n_extra_words, |
a5bfe84d | 403 | "make-struct"); |
2c53acd5 | 404 | data[scm_struct_i_procedure] = SCM_BOOL_F; |
25c94826 | 405 | data[scm_struct_i_setter] = SCM_BOOL_F; |
a5bfe84d MD |
406 | } |
407 | else | |
408 | data = scm_alloc_struct (basic_size + tail_elts, | |
409 | scm_struct_n_extra_words, | |
410 | "make-struct"); | |
0f2d19dd | 411 | SCM_SETCDR (handle, data); |
35457f1e | 412 | SCM_SETCAR (handle, ((SCM)SCM_STRUCT_DATA (vtable)) + scm_tc3_cons_gloc); |
a5bfe84d | 413 | scm_struct_init (handle, tail_elts, init); |
0f2d19dd JB |
414 | SCM_ALLOW_INTS; |
415 | return handle; | |
416 | } | |
1bbd0b84 | 417 | #undef FUNC_NAME |
0f2d19dd JB |
418 | |
419 | ||
420 | ||
a1ec6916 | 421 | SCM_DEFINE (scm_make_vtable_vtable, "make-vtable-vtable", 2, 0, 1, |
1bbd0b84 | 422 | (SCM extra_fields, SCM tail_array_size, SCM init), |
b380b885 MD |
423 | "Return a new, self-describing vtable structure.\n\n" |
424 | "@var{new-fields} is a layout specification describing fields\n" | |
425 | "of the resulting structure beginning at the position bound to\n" | |
426 | "@code{vtable-offset-user}.\n\n" | |
427 | "@var{tail-size} specifies the size of the tail-array (if any) of\n" | |
428 | "this vtable.\n\n" | |
429 | "@var{inits} initializes the fields of the vtable. Minimally, one\n" | |
430 | "initializer must be provided: the layout specification for instances\n" | |
431 | "of the type this vtable will describe. If a second initializer is\n" | |
432 | "provided, it will be interpreted as a print call-back function.\n\n" | |
433 | "@example\n" | |
434 | ";;; loading ,a...\n" | |
435 | "(define x\n" | |
436 | " (make-vtable-vtable (make-struct-layout (quote pw))\n" | |
437 | " 0\n" | |
438 | " 'foo))\n\n" | |
439 | "(struct? x)\n" | |
440 | "@result{} #t\n" | |
441 | "(struct-vtable? x)\n" | |
442 | "@result{} #t\n" | |
443 | "(eq? x (struct-vtable x))\n" | |
444 | "@result{} #t\n" | |
445 | "(struct-ref x vtable-offset-user)\n" | |
446 | "@result{} foo\n" | |
447 | "(struct-ref x 0)\n" | |
448 | "@result{} pruosrpwpw\n\n\n" | |
449 | "(define y\n" | |
450 | " (make-struct x\n" | |
451 | " 0\n" | |
452 | " (make-struct-layout (quote pwpwpw))\n" | |
453 | " 'bar))\n\n" | |
454 | "(struct? y)\n" | |
455 | "@result{} #t\n" | |
456 | "(struct-vtable? y)\n" | |
457 | "@result{} #t\n" | |
458 | "(eq? x y)\n" | |
459 | "@result{} ()\n" | |
460 | "(eq? x (struct-vtable y))\n" | |
461 | "@result{} #t\n" | |
462 | "(struct-ref y 0)\n" | |
463 | "@result{} pwpwpw\n" | |
464 | "(struct-ref y vtable-offset-user)\n" | |
465 | "@result{} bar\n\n\n" | |
466 | "(define z (make-struct y 0 'a 'b 'c))\n\n" | |
467 | "(struct? z)\n" | |
468 | "@result{} #t\n" | |
469 | "(struct-vtable? z)\n" | |
470 | "@result{} ()\n" | |
471 | "(eq? y (struct-vtable z))\n" | |
472 | "@result{} #t\n" | |
473 | "(map (lambda (n) (struct-ref z n)) '(0 1 2))\n" | |
474 | "@result{} (a b c)\n" | |
475 | "@end example\n" | |
476 | "") | |
1bbd0b84 | 477 | #define FUNC_NAME s_scm_make_vtable_vtable |
0f2d19dd JB |
478 | { |
479 | SCM fields; | |
480 | SCM layout; | |
481 | int basic_size; | |
482 | int tail_elts; | |
483 | SCM * data; | |
484 | SCM handle; | |
485 | ||
3b3b36dd GB |
486 | SCM_VALIDATE_ROSTRING (1,extra_fields); |
487 | SCM_VALIDATE_INUM (2,tail_array_size); | |
0f2d19dd JB |
488 | |
489 | fields = scm_string_append (scm_listify (required_vtable_fields, | |
490 | extra_fields, | |
491 | SCM_UNDEFINED)); | |
492 | layout = scm_make_struct_layout (fields); | |
493 | basic_size = SCM_LENGTH (layout) / 2; | |
494 | tail_elts = SCM_INUM (tail_array_size); | |
495 | SCM_NEWCELL (handle); | |
496 | SCM_DEFER_INTS; | |
a5bfe84d MD |
497 | data = scm_alloc_struct (basic_size + tail_elts, |
498 | scm_struct_n_extra_words, | |
499 | "make-vtable-vtable"); | |
0f2d19dd | 500 | SCM_SETCDR (handle, data); |
35457f1e | 501 | SCM_SETCAR (handle, ((SCM)data) + scm_tc3_cons_gloc); |
0f2d19dd | 502 | SCM_STRUCT_LAYOUT (handle) = layout; |
a5bfe84d | 503 | scm_struct_init (handle, tail_elts, scm_cons (layout, init)); |
0f2d19dd JB |
504 | SCM_ALLOW_INTS; |
505 | return handle; | |
506 | } | |
1bbd0b84 | 507 | #undef FUNC_NAME |
0f2d19dd JB |
508 | |
509 | \f | |
510 | ||
511 | ||
a1ec6916 | 512 | SCM_DEFINE (scm_struct_ref, "struct-ref", 2, 0, 0, |
1bbd0b84 | 513 | (SCM handle, SCM pos), |
b380b885 MD |
514 | "@deffnx primitive struct-set! struct n value\n" |
515 | "Access (or modify) the @var{n}th field of @var{struct}.\n\n" | |
516 | "If the field is of type 'p', then it can be set to an arbitrary value.\n\n" | |
517 | "If the field is of type 'u', then it can only be set to a non-negative\n" | |
518 | "integer value small enough to fit in one machine word.") | |
1bbd0b84 | 519 | #define FUNC_NAME s_scm_struct_ref |
0f2d19dd | 520 | { |
5e840c2e | 521 | SCM answer = SCM_UNDEFINED; |
0f2d19dd JB |
522 | SCM * data; |
523 | SCM layout; | |
524 | int p; | |
4d45e7b6 | 525 | scm_bits_t n_fields; |
0f2d19dd | 526 | unsigned char * fields_desc; |
f3667f52 | 527 | unsigned char field_type = 0; |
0f2d19dd JB |
528 | |
529 | ||
3b3b36dd GB |
530 | SCM_VALIDATE_STRUCT (1,handle); |
531 | SCM_VALIDATE_INUM (2,pos); | |
0f2d19dd JB |
532 | |
533 | layout = SCM_STRUCT_LAYOUT (handle); | |
534 | data = SCM_STRUCT_DATA (handle); | |
535 | p = SCM_INUM (pos); | |
536 | ||
ad196599 | 537 | fields_desc = (unsigned char *) SCM_CHARS (layout); |
413cb56f | 538 | n_fields = SCM_BITS (data[scm_struct_i_n_words]); |
2c36c351 | 539 | |
c751e5e3 | 540 | SCM_ASSERT_RANGE(1,pos, p < n_fields); |
0f2d19dd | 541 | |
2c36c351 MD |
542 | if (p * 2 < SCM_LENGTH (layout)) |
543 | { | |
544 | unsigned char ref; | |
545 | field_type = fields_desc[p * 2]; | |
546 | ref = fields_desc[p * 2 + 1]; | |
547 | if ((ref != 'r') && (ref != 'w')) | |
548 | { | |
549 | if ((ref == 'R') || (ref == 'W')) | |
550 | field_type = 'u'; | |
551 | else | |
1bbd0b84 | 552 | SCM_ASSERT (0, pos, "ref denied", FUNC_NAME); |
2c36c351 MD |
553 | } |
554 | } | |
555 | else if (fields_desc[SCM_LENGTH (layout) - 1] != 'O') | |
556 | field_type = fields_desc[SCM_LENGTH (layout) - 2]; | |
557 | else | |
558 | { | |
1bbd0b84 | 559 | SCM_ASSERT (0, pos, "ref denied", FUNC_NAME); |
35de7ebe | 560 | abort (); |
2c36c351 MD |
561 | } |
562 | ||
0f2d19dd JB |
563 | switch (field_type) |
564 | { | |
565 | case 'u': | |
413cb56f | 566 | answer = scm_ulong2num (SCM_BITS (data[p])); |
0f2d19dd JB |
567 | break; |
568 | ||
569 | #if 0 | |
570 | case 'i': | |
571 | answer = scm_long2num (data[p]); | |
572 | break; | |
573 | ||
574 | case 'd': | |
575 | answer = scm_makdbl (*((double *)&(data[p])), 0.0); | |
576 | break; | |
577 | #endif | |
578 | ||
579 | case 's': | |
580 | case 'p': | |
581 | answer = data[p]; | |
582 | break; | |
583 | ||
584 | ||
585 | default: | |
7866a09b | 586 | SCM_ASSERT (0, SCM_MAKE_CHAR (field_type), "unrecognized field type", FUNC_NAME); |
0f2d19dd JB |
587 | break; |
588 | } | |
589 | ||
590 | return answer; | |
591 | } | |
1bbd0b84 | 592 | #undef FUNC_NAME |
0f2d19dd JB |
593 | |
594 | ||
a1ec6916 | 595 | SCM_DEFINE (scm_struct_set_x, "struct-set!", 3, 0, 0, |
1bbd0b84 | 596 | (SCM handle, SCM pos, SCM val), |
b380b885 | 597 | "") |
1bbd0b84 | 598 | #define FUNC_NAME s_scm_struct_set_x |
0f2d19dd JB |
599 | { |
600 | SCM * data; | |
601 | SCM layout; | |
602 | int p; | |
603 | int n_fields; | |
604 | unsigned char * fields_desc; | |
f3667f52 | 605 | unsigned char field_type = 0; |
0f2d19dd | 606 | |
3b3b36dd GB |
607 | SCM_VALIDATE_STRUCT (1,handle); |
608 | SCM_VALIDATE_INUM (2,pos); | |
0f2d19dd JB |
609 | |
610 | layout = SCM_STRUCT_LAYOUT (handle); | |
611 | data = SCM_STRUCT_DATA (handle); | |
612 | p = SCM_INUM (pos); | |
613 | ||
614 | fields_desc = (unsigned char *)SCM_CHARS (layout); | |
413cb56f | 615 | n_fields = SCM_BITS (data[scm_struct_i_n_words]); |
0f2d19dd | 616 | |
c751e5e3 | 617 | SCM_ASSERT_RANGE (1,pos, p < n_fields); |
0f2d19dd | 618 | |
2c36c351 MD |
619 | if (p * 2 < SCM_LENGTH (layout)) |
620 | { | |
621 | unsigned char set_x; | |
622 | field_type = fields_desc[p * 2]; | |
623 | set_x = fields_desc [p * 2 + 1]; | |
624 | if (set_x != 'w') | |
1bbd0b84 | 625 | SCM_ASSERT (0, pos, "set_x denied", FUNC_NAME); |
2c36c351 MD |
626 | } |
627 | else if (fields_desc[SCM_LENGTH (layout) - 1] == 'W') | |
628 | field_type = fields_desc[SCM_LENGTH (layout) - 2]; | |
629 | else | |
630 | { | |
1bbd0b84 | 631 | SCM_ASSERT (0, pos, "set_x denied", FUNC_NAME); |
35de7ebe | 632 | abort (); |
2c36c351 MD |
633 | } |
634 | ||
0f2d19dd JB |
635 | switch (field_type) |
636 | { | |
637 | case 'u': | |
413cb56f | 638 | data[p] = SCM_SCM (SCM_NUM2ULONG (3, val)); |
0f2d19dd JB |
639 | break; |
640 | ||
641 | #if 0 | |
642 | case 'i': | |
1bbd0b84 | 643 | data[p] = SCM_NUM2LONG (3,val); |
0f2d19dd JB |
644 | break; |
645 | ||
646 | case 'd': | |
647 | *((double *)&(data[p])) = scm_num2dbl (val, (char *)SCM_ARG3); | |
648 | break; | |
649 | #endif | |
650 | ||
651 | case 'p': | |
652 | data[p] = val; | |
653 | break; | |
654 | ||
655 | case 's': | |
7866a09b | 656 | SCM_ASSERT (0, SCM_MAKE_CHAR (field_type), "self fields immutable", FUNC_NAME); |
0f2d19dd JB |
657 | break; |
658 | ||
659 | default: | |
7866a09b | 660 | SCM_ASSERT (0, SCM_MAKE_CHAR (field_type), "unrecognized field type", FUNC_NAME); |
0f2d19dd JB |
661 | break; |
662 | } | |
663 | ||
664 | return val; | |
665 | } | |
1bbd0b84 | 666 | #undef FUNC_NAME |
0f2d19dd JB |
667 | |
668 | ||
a1ec6916 | 669 | SCM_DEFINE (scm_struct_vtable, "struct-vtable", 1, 0, 0, |
1bbd0b84 | 670 | (SCM handle), |
b380b885 | 671 | "Return the vtable structure that describes the type of @var{struct}.") |
1bbd0b84 | 672 | #define FUNC_NAME s_scm_struct_vtable |
0f2d19dd | 673 | { |
3b3b36dd | 674 | SCM_VALIDATE_STRUCT (1,handle); |
0f2d19dd JB |
675 | return SCM_STRUCT_VTABLE (handle); |
676 | } | |
1bbd0b84 | 677 | #undef FUNC_NAME |
0f2d19dd JB |
678 | |
679 | ||
a1ec6916 | 680 | SCM_DEFINE (scm_struct_vtable_tag, "struct-vtable-tag", 1, 0, 0, |
1bbd0b84 | 681 | (SCM handle), |
b380b885 | 682 | "") |
1bbd0b84 | 683 | #define FUNC_NAME s_scm_struct_vtable_tag |
0f2d19dd | 684 | { |
3b3b36dd | 685 | SCM_VALIDATE_VTABLE (1,handle); |
ad196599 | 686 | return scm_long2num ((long) SCM_STRUCT_DATA (handle) >> 3); |
98d5f601 | 687 | } |
1bbd0b84 | 688 | #undef FUNC_NAME |
98d5f601 MD |
689 | |
690 | /* {Associating names and classes with vtables} | |
691 | * | |
692 | * The name of a vtable should probably be stored as a slot. This is | |
693 | * a backward compatible solution until agreement has been achieved on | |
694 | * how to associate names with vtables. | |
695 | */ | |
696 | ||
697 | unsigned int | |
698 | scm_struct_ihashq (SCM obj, unsigned int n) | |
699 | { | |
ad196599 MD |
700 | /* The length of the hash table should be a relative prime it's not |
701 | necessary to shift down the address. */ | |
413cb56f | 702 | return SCM_BITS (obj) % n; |
98d5f601 MD |
703 | } |
704 | ||
705 | SCM | |
706 | scm_struct_create_handle (SCM obj) | |
707 | { | |
708 | SCM handle = scm_hash_fn_create_handle_x (scm_struct_table, | |
709 | obj, | |
710 | SCM_BOOL_F, | |
711 | scm_struct_ihashq, | |
712 | scm_sloppy_assq, | |
713 | 0); | |
714 | if (SCM_FALSEP (SCM_CDR (handle))) | |
715 | SCM_SETCDR (handle, scm_cons (SCM_BOOL_F, SCM_BOOL_F)); | |
716 | return handle; | |
717 | } | |
718 | ||
a1ec6916 | 719 | SCM_DEFINE (scm_struct_vtable_name, "struct-vtable-name", 1, 0, 0, |
1bbd0b84 | 720 | (SCM vtable), |
b380b885 | 721 | "") |
1bbd0b84 | 722 | #define FUNC_NAME s_scm_struct_vtable_name |
98d5f601 | 723 | { |
3b3b36dd | 724 | SCM_VALIDATE_VTABLE (1,vtable); |
98d5f601 MD |
725 | return SCM_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable))); |
726 | } | |
1bbd0b84 | 727 | #undef FUNC_NAME |
98d5f601 | 728 | |
a1ec6916 | 729 | SCM_DEFINE (scm_set_struct_vtable_name_x, "set-struct-vtable-name!", 2, 0, 0, |
1bbd0b84 | 730 | (SCM vtable, SCM name), |
b380b885 | 731 | "") |
1bbd0b84 | 732 | #define FUNC_NAME s_scm_set_struct_vtable_name_x |
98d5f601 | 733 | { |
3b3b36dd GB |
734 | SCM_VALIDATE_VTABLE (1,vtable); |
735 | SCM_VALIDATE_SYMBOL (2,name); | |
98d5f601 MD |
736 | SCM_SET_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable)), |
737 | name); | |
738 | return SCM_UNSPECIFIED; | |
0f2d19dd | 739 | } |
1bbd0b84 | 740 | #undef FUNC_NAME |
0f2d19dd JB |
741 | |
742 | ||
743 | \f | |
744 | ||
bafcafb2 | 745 | void |
1bbd0b84 | 746 | scm_print_struct (SCM exp, SCM port, scm_print_state *pstate) |
bafcafb2 | 747 | { |
4bfdf158 MD |
748 | if (SCM_NFALSEP (scm_procedure_p (SCM_STRUCT_PRINTER (exp)))) |
749 | scm_printer_apply (SCM_STRUCT_PRINTER (exp), exp, port, pstate); | |
750 | else | |
bafcafb2 | 751 | { |
a1ae1799 MD |
752 | SCM vtable = SCM_STRUCT_VTABLE (exp); |
753 | SCM name = scm_struct_vtable_name (vtable); | |
754 | scm_puts ("#<", port); | |
755 | if (SCM_NFALSEP (name)) | |
756 | scm_display (name, port); | |
757 | else | |
758 | scm_puts ("struct", port); | |
759 | scm_putc (' ', port); | |
c209c88e | 760 | scm_intprint ((int) vtable, 16, port); |
b7f3516f | 761 | scm_putc (':', port); |
c209c88e | 762 | scm_intprint ((int)exp, 16, port); |
b7f3516f | 763 | scm_putc ('>', port); |
bafcafb2 | 764 | } |
bafcafb2 | 765 | } |
1cc91f1b | 766 | |
0f2d19dd JB |
767 | void |
768 | scm_init_struct () | |
0f2d19dd | 769 | { |
98d5f601 MD |
770 | scm_struct_table |
771 | = scm_permanent_object (scm_make_weak_key_hash_table (SCM_MAKINUM (31))); | |
4bfdf158 | 772 | required_vtable_fields = SCM_CAR (scm_intern_obarray ("pruosrpw", sizeof ("pruosrpw") - 1, SCM_BOOL_F)); |
0f2d19dd | 773 | scm_permanent_object (required_vtable_fields); |
4bfdf158 MD |
774 | scm_sysintern ("vtable-index-layout", SCM_MAKINUM (scm_vtable_index_layout)); |
775 | scm_sysintern ("vtable-index-vtable", SCM_MAKINUM (scm_vtable_index_vtable)); | |
776 | scm_sysintern ("vtable-index-printer", SCM_MAKINUM (scm_vtable_index_printer)); | |
777 | scm_sysintern ("vtable-offset-user", SCM_MAKINUM (scm_vtable_offset_user)); | |
0f2d19dd JB |
778 | #include "struct.x" |
779 | } |