Commit | Line | Data |
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1d9ee7c7 MD |
1 | /* Copyright (C) 1995,1996 Free Software Foundation, Inc. |
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 | |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | * Boston, MA 02111-1307 USA | |
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. | |
40 | * If you do not wish that, delete this exception notice. */ | |
41 | \f | |
42 | ||
da7f71d7 MD |
43 | /* This file and objects.h contains those minimal pieces of the Guile |
44 | * Object Oriented Programming System which need to be included in | |
45 | * libguile. See the comments in objects.h. | |
1d9ee7c7 MD |
46 | */ |
47 | ||
48 | #include "_scm.h" | |
49 | ||
50 | #include "struct.h" | |
47b21050 | 51 | #include "procprop.h" |
ab7288bc MD |
52 | #include "chars.h" |
53 | #include "kw.h" | |
ed6e0c83 | 54 | #include "smob.h" |
1d9ee7c7 MD |
55 | |
56 | #include "objects.h" | |
57 | \f | |
58 | ||
59 | SCM scm_metaclass_standard; | |
da7f71d7 | 60 | SCM scm_metaclass_operator; |
1d9ee7c7 | 61 | |
ab7288bc MD |
62 | /* These variables are filled in by the object system when loaded. */ |
63 | SCM scm_class_boolean, scm_class_char, scm_class_pair; | |
64 | SCM scm_class_procedure, scm_class_string, scm_class_symbol; | |
65 | SCM scm_class_procedure_with_setter; | |
66 | SCM scm_class_vector, scm_class_null; | |
ed6e0c83 MD |
67 | SCM scm_class_integer, scm_class_real, scm_class_complex; |
68 | SCM scm_class_unknown; | |
ab7288bc | 69 | |
ed6e0c83 MD |
70 | SCM *scm_smob_class = 0; |
71 | ||
72 | SCM (*scm_make_extended_class) (char *type_name); | |
ab7288bc MD |
73 | void (*scm_change_object_class) (SCM, SCM, SCM); |
74 | ||
75 | /* This function is used for efficient type dispatch. */ | |
76 | SCM | |
77 | scm_class_of (SCM x) | |
78 | { | |
79 | switch (SCM_ITAG3 (x)) | |
80 | { | |
81 | case scm_tc3_int_1: | |
82 | case scm_tc3_int_2: | |
83 | return scm_class_integer; | |
84 | ||
85 | case scm_tc3_imm24: | |
86 | if (SCM_ICHRP (x)) | |
87 | return scm_class_char; | |
88 | else | |
89 | { | |
90 | switch (SCM_ISYMNUM (x)) | |
91 | { | |
92 | case SCM_ISYMNUM (SCM_BOOL_F): | |
93 | case SCM_ISYMNUM (SCM_BOOL_T): | |
94 | return scm_class_boolean; | |
95 | case SCM_ISYMNUM (SCM_EOL): | |
96 | return scm_class_null; | |
97 | default: | |
98 | return scm_class_unknown; | |
99 | } | |
100 | } | |
101 | ||
102 | case scm_tc3_cons: | |
103 | switch (SCM_TYP7 (x)) | |
104 | { | |
105 | case scm_tcs_cons_nimcar: | |
106 | return scm_class_pair; | |
107 | case scm_tcs_closures: | |
108 | return scm_class_procedure; | |
109 | case scm_tcs_symbols: | |
110 | return scm_class_symbol; | |
111 | case scm_tc7_vector: | |
112 | case scm_tc7_wvect: | |
113 | case scm_tc7_bvect: | |
114 | case scm_tc7_byvect: | |
115 | case scm_tc7_svect: | |
116 | case scm_tc7_ivect: | |
117 | case scm_tc7_uvect: | |
118 | case scm_tc7_fvect: | |
119 | case scm_tc7_dvect: | |
120 | case scm_tc7_cvect: | |
121 | return scm_class_vector; | |
122 | case scm_tc7_string: | |
123 | case scm_tc7_substring: | |
124 | return scm_class_string; | |
125 | case scm_tc7_asubr: | |
126 | case scm_tc7_subr_0: | |
127 | case scm_tc7_subr_1: | |
128 | case scm_tc7_cxr: | |
129 | case scm_tc7_subr_3: | |
130 | case scm_tc7_subr_2: | |
131 | case scm_tc7_rpsubr: | |
132 | case scm_tc7_subr_1o: | |
133 | case scm_tc7_subr_2o: | |
134 | case scm_tc7_lsubr_2: | |
135 | case scm_tc7_lsubr: | |
ed6e0c83 | 136 | case scm_tc7_cclo: |
ab7288bc MD |
137 | return scm_class_procedure; |
138 | case scm_tc7_pws: | |
139 | return scm_class_procedure_with_setter; | |
140 | ||
141 | case scm_tc7_port: | |
142 | return scm_class_unknown; | |
143 | case scm_tc7_smob: | |
144 | { | |
145 | SCM type = SCM_TYP16 (x); | |
146 | if (type == scm_tc16_flo) | |
147 | { | |
148 | if (SCM_CAR (x) & SCM_IMAG_PART) | |
149 | return scm_class_complex; | |
150 | else | |
151 | return scm_class_real; | |
152 | } | |
ab7288bc | 153 | else |
ed6e0c83 | 154 | return scm_smob_class[SCM_TC2SMOBNUM (type)]; |
ab7288bc MD |
155 | } |
156 | case scm_tcs_cons_gloc: | |
157 | /* must be a struct */ | |
158 | if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS) | |
ed6e0c83 MD |
159 | { |
160 | /* Goops object */ | |
161 | if (SCM_OBJ_CLASS_REDEF (x) != SCM_BOOL_F) | |
162 | scm_change_object_class (x, | |
163 | SCM_CLASS_OF (x), /* old */ | |
164 | SCM_OBJ_CLASS_REDEF (x)); /* new */ | |
165 | return SCM_CLASS_OF (x); | |
166 | } | |
167 | else | |
168 | { | |
169 | /* ordinary struct */ | |
170 | SCM handle = scm_struct_create_handle (SCM_STRUCT_VTABLE (x)); | |
171 | if (SCM_NFALSEP (SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle)))) | |
172 | return SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle)); | |
173 | else | |
174 | { | |
175 | SCM name = SCM_STRUCT_TABLE_NAME (SCM_CDR (handle)); | |
176 | SCM class = scm_make_extended_class (SCM_NFALSEP (name) | |
177 | ? SCM_ROCHARS (name) | |
178 | : 0); | |
179 | SCM_SET_STRUCT_TABLE_CLASS (handle, class); | |
180 | return class; | |
181 | } | |
182 | } | |
ab7288bc MD |
183 | default: |
184 | if (SCM_CONSP (x)) | |
185 | return scm_class_pair; | |
186 | else | |
187 | return scm_class_unknown; | |
188 | } | |
189 | ||
190 | case scm_tc3_cons_gloc: | |
191 | case scm_tc3_tc7_1: | |
192 | case scm_tc3_tc7_2: | |
193 | case scm_tc3_closure: | |
194 | /* Never reached */ | |
195 | break; | |
196 | } | |
197 | return scm_class_unknown; | |
198 | } | |
199 | ||
19c0dec2 MD |
200 | SCM_PROC (s_entity_p, "entity?", 1, 0, 0, scm_entity_p); |
201 | ||
202 | SCM | |
203 | scm_entity_p (SCM obj) | |
204 | { | |
205 | return (SCM_NIMP (obj) && SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj) | |
206 | ? SCM_BOOL_T | |
207 | : SCM_BOOL_F); | |
208 | } | |
209 | ||
47b21050 MD |
210 | SCM_PROC (s_set_object_procedure_x, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x); |
211 | ||
212 | SCM | |
213 | scm_set_object_procedure_x (SCM obj, SCM procs) | |
214 | { | |
215 | SCM proc[4], *pp, p, setp, arity; | |
216 | int i, a, r; | |
217 | SCM_ASSERT (SCM_NIMP (obj) && SCM_STRUCTP (obj) | |
3b7284cd | 218 | && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR) |
47b21050 MD |
219 | || SCM_I_ENTITYP (obj)), |
220 | obj, | |
221 | SCM_ARG1, | |
222 | s_set_object_procedure_x); | |
223 | for (i = 0; i < 4; ++i) | |
224 | proc[i] = SCM_BOOL_F; | |
225 | i = 0; | |
226 | while (SCM_NIMP (procs)) | |
227 | { | |
228 | if (i == 4) | |
229 | scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x)); | |
230 | p = SCM_CAR (procs); | |
231 | setp = 0; | |
232 | SCM_ASSERT (SCM_NIMP (p), p, SCM_ARG2 + i, s_set_object_procedure_x); | |
233 | if (SCM_CLOSUREP (p)) | |
234 | { | |
235 | arity = scm_procedure_property (p, scm_sym_arity); | |
236 | a = SCM_INUM (SCM_CAR (arity)); | |
237 | /* Closures have zero optional args */ | |
238 | r = SCM_NFALSEP (SCM_CADDR (arity)); | |
239 | if (a == 1 || (a <= 1 && r)) | |
240 | { | |
241 | if (SCM_NFALSEP (proc[0])) | |
242 | goto ambiguous; | |
243 | proc[0] = setp = p; | |
244 | } | |
245 | if (a == 2 || (a <= 2 && r)) | |
246 | { | |
247 | if (SCM_NFALSEP (proc[1])) | |
248 | goto ambiguous; | |
249 | proc[1] = setp = p; | |
250 | } | |
251 | if (a == 3 || (a <= 3 && r)) | |
252 | { | |
253 | if (SCM_NFALSEP (proc[2])) | |
254 | goto ambiguous; | |
255 | proc[2] = setp = p; | |
256 | } | |
257 | if (a <= 4 && r) | |
258 | { | |
259 | if (SCM_NFALSEP (proc[3])) | |
260 | goto ambiguous; | |
261 | proc[3] = setp = p; | |
262 | } | |
263 | } | |
264 | else if (SCM_TYP7 (p) == scm_tc7_subr_1) | |
265 | { | |
266 | if (SCM_NFALSEP (proc[0])) | |
267 | goto ambiguous; | |
268 | proc[0] = setp = p; | |
269 | } | |
270 | else if (SCM_TYP7 (p) == scm_tc7_subr_2) | |
271 | { | |
272 | if (SCM_NFALSEP (proc[1])) | |
273 | goto ambiguous; | |
274 | proc[1] = setp = p; | |
275 | } | |
276 | else if (SCM_TYP7 (p) == scm_tc7_subr_3) | |
277 | { | |
278 | if (SCM_NFALSEP (proc[2])) | |
279 | goto ambiguous; | |
280 | proc[2] = setp = p; | |
281 | } | |
282 | else if (SCM_TYP7 (p) == scm_tc7_lsubr_2) | |
283 | { | |
284 | if (SCM_NFALSEP (proc[3])) | |
285 | { | |
286 | ambiguous: | |
287 | SCM_ASSERT (0, p, "Ambiguous procedure arities", | |
288 | s_set_object_procedure_x); | |
289 | } | |
290 | proc[3] = setp = p; | |
291 | } | |
292 | SCM_ASSERT (setp, p, SCM_ARG2 + i, s_set_object_procedure_x); | |
293 | ++i; | |
294 | procs = SCM_CDR (procs); | |
295 | } | |
296 | pp = (SCM_I_ENTITYP (obj) | |
297 | ? &SCM_ENTITY_PROC_0 (obj) | |
298 | : &SCM_OPERATOR_CLASS (obj)->proc0); | |
299 | for (i = 0; i < 4; ++i) | |
300 | *pp++ = proc[i]; | |
301 | return SCM_UNSPECIFIED; | |
302 | } | |
303 | ||
ed6e0c83 MD |
304 | /* The following procedures are not a part of Goops but a minimal |
305 | * object system built upon structs. They are here for those who | |
306 | * want to implement their own object system. | |
307 | */ | |
308 | ||
036737fc MD |
309 | SCM |
310 | scm_i_make_class_object (SCM meta, | |
311 | SCM layout_string, | |
312 | unsigned long flags) | |
47b21050 MD |
313 | { |
314 | SCM c; | |
036737fc | 315 | SCM layout = scm_make_struct_layout (layout_string); |
47b21050 MD |
316 | c = scm_make_struct (meta, |
317 | SCM_INUM0, | |
318 | SCM_LIST4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL)); | |
319 | SCM_SET_CLASS_FLAGS (c, flags); | |
320 | return c; | |
321 | } | |
322 | ||
323 | SCM_PROC (s_make_class_object, "make-class-object", 2, 0, 0, scm_make_class_object); | |
324 | ||
325 | SCM | |
326 | scm_make_class_object (SCM metaclass, SCM layout) | |
327 | { | |
328 | unsigned long flags = 0; | |
036737fc MD |
329 | SCM_ASSERT (SCM_NIMP (metaclass) && SCM_STRUCTP (metaclass), |
330 | metaclass, SCM_ARG1, s_make_class_object); | |
331 | SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout), | |
332 | layout, SCM_ARG2, s_make_class_object); | |
47b21050 MD |
333 | if (metaclass == scm_metaclass_operator) |
334 | flags = SCM_CLASSF_OPERATOR; | |
036737fc | 335 | return scm_i_make_class_object (metaclass, layout, flags); |
47b21050 MD |
336 | } |
337 | ||
338 | SCM_PROC (s_make_subclass_object, "make-subclass-object", 2, 0, 0, scm_make_subclass_object); | |
339 | ||
340 | SCM | |
341 | scm_make_subclass_object (SCM class, SCM layout) | |
342 | { | |
343 | SCM pl; | |
344 | SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class), | |
345 | class, | |
346 | SCM_ARG1, | |
347 | s_make_subclass_object); | |
036737fc MD |
348 | SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout), |
349 | layout, | |
350 | SCM_ARG2, | |
351 | s_make_subclass_object); | |
47b21050 | 352 | pl = SCM_STRUCT_DATA (class)[scm_vtable_index_layout]; |
036737fc | 353 | /* Convert symbol->string */ |
47b21050 | 354 | pl = scm_makfromstr (SCM_CHARS (pl), (scm_sizet) SCM_LENGTH (pl), 0); |
036737fc MD |
355 | return scm_i_make_class_object (SCM_STRUCT_VTABLE (class), |
356 | scm_string_append (SCM_LIST2 (pl, layout)), | |
357 | SCM_CLASS_FLAGS (class)); | |
47b21050 MD |
358 | } |
359 | ||
1d9ee7c7 MD |
360 | void |
361 | scm_init_objects () | |
362 | { | |
363 | SCM ms = scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT); | |
364 | SCM ml = scm_make_struct_layout (ms); | |
365 | SCM mt = scm_make_vtable_vtable (ml, SCM_INUM0, | |
366 | SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL)); | |
367 | ||
da7f71d7 MD |
368 | SCM os = scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT); |
369 | SCM ol = scm_make_struct_layout (os); | |
370 | SCM ot = scm_make_vtable_vtable (ol, SCM_INUM0, | |
371 | SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL)); | |
372 | ||
1d9ee7c7 MD |
373 | SCM es = scm_makfrom0str (SCM_ENTITY_LAYOUT); |
374 | SCM el = scm_make_struct_layout (es); | |
375 | SCM et = scm_make_struct (mt, SCM_INUM0, | |
376 | SCM_LIST4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL)); | |
377 | ||
19c0dec2 | 378 | scm_sysintern ("<class>", mt); |
1d9ee7c7 | 379 | scm_metaclass_standard = mt; |
af3645c5 | 380 | scm_sysintern ("<operator-class>", ot); |
da7f71d7 MD |
381 | scm_metaclass_operator = ot; |
382 | SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY); | |
af3645c5 | 383 | scm_sysintern ("<entity>", et); |
47b21050 MD |
384 | |
385 | #include "objects.x" | |
1d9ee7c7 | 386 | } |