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152abe96 | 1 | /* Copyright (C) 1998, 2000 Free Software Foundation, Inc. |
1ffa265b MD |
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. */ | |
6e8d25a6 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 | ||
1ffa265b MD |
45 | \f |
46 | ||
a0599745 | 47 | #include "libguile/_scm.h" |
1ffa265b | 48 | |
a0599745 | 49 | #include "libguile/eval.h" |
fb43bf74 | 50 | #include "libguile/smob.h" |
a0599745 | 51 | #include "libguile/procprop.h" |
152abe96 MD |
52 | #include "libguile/vectors.h" |
53 | #include "libguile/hashtab.h" | |
54 | #include "libguile/struct.h" | |
55 | #include "libguile/variable.h" | |
7f763132 | 56 | #include "libguile/fluids.h" |
1ffa265b | 57 | |
a0599745 | 58 | #include "libguile/modules.h" |
1ffa265b | 59 | |
e3365c07 MD |
60 | SCM scm_module_system_booted_p = 0; |
61 | ||
62 | SCM scm_module_tag; | |
55000e5f | 63 | SCM scm_module_type; |
e3365c07 | 64 | |
281004cc | 65 | static SCM the_root_module; |
c15c33ee | 66 | static SCM root_module_lookup_closure; |
281004cc MD |
67 | |
68 | SCM | |
69 | scm_the_root_module () | |
70 | { | |
71 | return SCM_CDR (the_root_module); | |
72 | } | |
73 | ||
1ffa265b MD |
74 | static SCM the_module; |
75 | ||
55000e5f MV |
76 | SCM_DEFINE (scm_current_module, "current-module", 0, 0, 0, |
77 | (), | |
78 | "Return the current module.") | |
79 | #define FUNC_NAME s_scm_current_module | |
1ffa265b | 80 | { |
55000e5f | 81 | return scm_fluid_ref (the_module); |
1ffa265b | 82 | } |
55000e5f | 83 | #undef FUNC_NAME |
1ffa265b | 84 | |
55000e5f MV |
85 | #define SCM_VALIDATE_STRUCT_TYPE(pos, v, type) \ |
86 | do { \ | |
87 | SCM_ASSERT (SCM_NIMP (v) && SCM_NFALSEP (SCM_STRUCTP (v)) \ | |
88 | && SCM_STRUCT_VTABLE (v) == (type), \ | |
89 | v, pos, FUNC_NAME); \ | |
90 | } while (0) | |
1ffa265b | 91 | |
55000e5f MV |
92 | SCM_DEFINE (scm_set_current_module, "set-current-module", 1, 0, 0, |
93 | (SCM module), | |
94 | "Set the current module to @var{module} and return" | |
95 | "the previous current module.") | |
96 | #define FUNC_NAME s_scm_set_current_module | |
1ffa265b | 97 | { |
55000e5f MV |
98 | SCM old; |
99 | ||
100 | /* XXX - we can not validate our argument when the module system | |
101 | hasn't been booted yet since we don't know the type. This | |
102 | should be fixed when we have a cleaner way of booting | |
103 | Guile. | |
104 | */ | |
105 | if (scm_module_system_booted_p) | |
106 | SCM_VALIDATE_STRUCT_TYPE (SCM_ARG1, module, scm_module_type); | |
107 | ||
108 | old = scm_current_module (); | |
109 | scm_fluid_set_x (the_module, module); | |
110 | ||
111 | #if SCM_DEBUG_DEPRECATED == 0 | |
112 | scm_fluid_set_x (SCM_CDR (scm_top_level_lookup_closure_var), | |
113 | scm_current_module_lookup_closure ()); | |
114 | scm_fluid_set_x (SCM_CDR (scm_system_transformer), | |
115 | scm_current_module_transformer ()); | |
116 | #endif | |
117 | ||
1ffa265b MD |
118 | return old; |
119 | } | |
55000e5f | 120 | #undef FUNC_NAME |
1ffa265b | 121 | |
e3365c07 MD |
122 | SCM_DEFINE (scm_interaction_environment, "interaction-environment", 0, 0, 0, |
123 | (), | |
1e6808ea MG |
124 | "Return a specifier for the environment that contains\n" |
125 | "implementation--defined bindings, typically a superset of those\n" | |
126 | "listed in the report. The intent is that this procedure will\n" | |
127 | "return the environment in which the implementation would\n" | |
128 | "evaluate expressions dynamically typed by the user.") | |
e3365c07 MD |
129 | #define FUNC_NAME s_scm_interaction_environment |
130 | { | |
aa767bc5 | 131 | return scm_current_module (); |
e3365c07 MD |
132 | } |
133 | #undef FUNC_NAME | |
134 | ||
1ffa265b MD |
135 | SCM_SYMBOL (scm_sym_app, "app"); |
136 | SCM_SYMBOL (scm_sym_modules, "modules"); | |
137 | static SCM module_prefix; | |
138 | ||
139 | static SCM | |
140 | scm_module_full_name (SCM name) | |
141 | { | |
54778cd3 | 142 | if (SCM_EQ_P (SCM_CAR (name), scm_sym_app)) |
1ffa265b MD |
143 | return name; |
144 | else | |
145 | return scm_append (SCM_LIST2 (module_prefix, name)); | |
146 | } | |
147 | ||
148 | static SCM make_modules_in; | |
281004cc | 149 | static SCM beautify_user_module_x; |
1ffa265b MD |
150 | |
151 | SCM | |
152 | scm_make_module (SCM name) | |
153 | { | |
154 | return scm_apply (SCM_CDR (make_modules_in), | |
281004cc | 155 | SCM_LIST2 (scm_the_root_module (), |
1ffa265b MD |
156 | scm_module_full_name (name)), |
157 | SCM_EOL); | |
158 | } | |
159 | ||
281004cc MD |
160 | SCM |
161 | scm_ensure_user_module (SCM module) | |
162 | { | |
163 | scm_apply (SCM_CDR (beautify_user_module_x), SCM_LIST1 (module), SCM_EOL); | |
164 | return SCM_UNSPECIFIED; | |
165 | } | |
166 | ||
1ffa265b MD |
167 | SCM |
168 | scm_module_lookup_closure (SCM module) | |
169 | { | |
e3365c07 | 170 | return SCM_MODULE_EVAL_CLOSURE (module); |
1ffa265b MD |
171 | } |
172 | ||
9e57344b MV |
173 | SCM |
174 | scm_current_module_lookup_closure () | |
175 | { | |
176 | if (scm_module_system_booted_p) | |
177 | return scm_module_lookup_closure (scm_current_module ()); | |
178 | else | |
179 | return SCM_BOOL_F; | |
180 | } | |
181 | ||
55000e5f MV |
182 | SCM |
183 | scm_module_transformer (SCM module) | |
184 | { | |
185 | return SCM_MODULE_TRANSFORMER (module); | |
186 | } | |
187 | ||
188 | SCM | |
189 | scm_current_module_transformer () | |
190 | { | |
191 | if (scm_module_system_booted_p) | |
192 | return scm_module_transformer (scm_current_module ()); | |
193 | else | |
194 | return SCM_BOOL_F; | |
195 | } | |
196 | ||
90184345 MD |
197 | static SCM resolve_module; |
198 | ||
199 | SCM | |
200 | scm_resolve_module (SCM name) | |
201 | { | |
202 | return scm_apply (SCM_CDR (resolve_module), SCM_LIST1 (name), SCM_EOL); | |
203 | } | |
204 | ||
281004cc MD |
205 | static SCM try_module_autoload; |
206 | ||
207 | SCM | |
208 | scm_load_scheme_module (SCM name) | |
209 | { | |
210 | return scm_apply (SCM_CDR (try_module_autoload), SCM_LIST1 (name), SCM_EOL); | |
211 | } | |
212 | ||
e3365c07 | 213 | /* Environments */ |
d164a5af MD |
214 | |
215 | SCM | |
6e8d25a6 | 216 | scm_top_level_env (SCM thunk) |
d164a5af MD |
217 | { |
218 | if (SCM_IMP (thunk)) | |
219 | return SCM_EOL; | |
220 | else | |
221 | return scm_cons (thunk, SCM_EOL); | |
222 | } | |
223 | ||
224 | SCM | |
225 | scm_env_top_level (SCM env) | |
226 | { | |
227 | while (SCM_NIMP (env)) | |
228 | { | |
229 | if (!SCM_CONSP (SCM_CAR (env)) | |
230 | && SCM_NFALSEP (scm_procedure_p (SCM_CAR (env)))) | |
c15c33ee | 231 | return SCM_CAR (env); |
d164a5af MD |
232 | env = SCM_CDR (env); |
233 | } | |
234 | return SCM_BOOL_F; | |
235 | } | |
236 | ||
237 | ||
238 | SCM_SYMBOL (scm_sym_system_module, "system-module"); | |
239 | ||
240 | SCM | |
241 | scm_system_module_env_p (SCM env) | |
242 | { | |
243 | SCM proc = scm_env_top_level (env); | |
244 | if (SCM_FALSEP (proc)) | |
c15c33ee | 245 | proc = root_module_lookup_closure; |
d164a5af MD |
246 | return ((SCM_NFALSEP (scm_procedure_property (proc, |
247 | scm_sym_system_module))) | |
248 | ? SCM_BOOL_T | |
249 | : SCM_BOOL_F); | |
250 | } | |
251 | ||
152abe96 MD |
252 | /* |
253 | * C level implementation of the standard eval closure | |
254 | * | |
255 | * This increases loading speed substantially. | |
256 | * The code will be replaced by the low-level environments in next release. | |
257 | */ | |
258 | ||
152abe96 MD |
259 | static SCM module_make_local_var_x; |
260 | ||
261 | static SCM | |
262 | module_variable (SCM module, SCM sym) | |
263 | { | |
264 | /* 1. Check module obarray */ | |
e3365c07 | 265 | SCM b = scm_hashq_ref (SCM_MODULE_OBARRAY (module), sym, SCM_UNDEFINED); |
152abe96 MD |
266 | if (SCM_VARIABLEP (b)) |
267 | return b; | |
268 | { | |
e3365c07 | 269 | SCM binder = SCM_MODULE_BINDER (module); |
152abe96 MD |
270 | if (SCM_NFALSEP (binder)) |
271 | /* 2. Custom binder */ | |
272 | { | |
273 | b = scm_apply (binder, | |
274 | SCM_LIST3 (module, sym, SCM_BOOL_F), | |
275 | SCM_EOL); | |
276 | if (SCM_NFALSEP (b)) | |
277 | return b; | |
278 | } | |
279 | } | |
280 | { | |
281 | /* 3. Search the use list */ | |
e3365c07 | 282 | SCM uses = SCM_MODULE_USES (module); |
152abe96 MD |
283 | while (SCM_CONSP (uses)) |
284 | { | |
285 | b = module_variable (SCM_CAR (uses), sym); | |
286 | if (SCM_NFALSEP (b)) | |
287 | return b; | |
288 | uses = SCM_CDR (uses); | |
289 | } | |
290 | return SCM_BOOL_F; | |
291 | } | |
292 | } | |
293 | ||
e841c3e0 | 294 | scm_bits_t scm_tc16_eval_closure; |
152abe96 | 295 | |
fb43bf74 KN |
296 | /* NOTE: This function may be called by a smob application |
297 | or from another C function directly. */ | |
298 | SCM | |
299 | scm_eval_closure_lookup (SCM eclo, SCM sym, SCM definep) | |
152abe96 | 300 | { |
fb43bf74 | 301 | SCM module = SCM_PACK (SCM_SMOB_DATA (eclo)); |
152abe96 MD |
302 | if (SCM_NFALSEP (definep)) |
303 | return scm_apply (SCM_CDR (module_make_local_var_x), | |
304 | SCM_LIST2 (module, sym), | |
305 | SCM_EOL); | |
306 | else | |
307 | return module_variable (module, sym); | |
308 | } | |
309 | ||
310 | SCM_DEFINE (scm_standard_eval_closure, "standard-eval-closure", 1, 0, 0, | |
311 | (SCM module), | |
84526793 | 312 | "Return an eval closure for the module @var{module}.") |
152abe96 MD |
313 | #define FUNC_NAME s_scm_standard_eval_closure |
314 | { | |
e841c3e0 | 315 | SCM_RETURN_NEWSMOB (scm_tc16_eval_closure, SCM_UNPACK (module)); |
152abe96 MD |
316 | } |
317 | #undef FUNC_NAME | |
318 | ||
1ffa265b MD |
319 | void |
320 | scm_init_modules () | |
321 | { | |
8dc9439f | 322 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 323 | #include "libguile/modules.x" |
8dc9439f | 324 | #endif |
152abe96 MD |
325 | module_make_local_var_x = scm_sysintern ("module-make-local-var!", |
326 | SCM_UNDEFINED); | |
e841c3e0 KN |
327 | scm_tc16_eval_closure = scm_make_smob_type ("eval-closure", 0); |
328 | scm_set_smob_mark (scm_tc16_eval_closure, scm_markcdr); | |
329 | scm_set_smob_apply (scm_tc16_eval_closure, scm_eval_closure_lookup, 2, 0, 0); | |
55000e5f MV |
330 | |
331 | the_module = scm_permanent_object (scm_make_fluid ()); | |
1ffa265b MD |
332 | } |
333 | ||
334 | void | |
335 | scm_post_boot_init_modules () | |
336 | { | |
55000e5f MV |
337 | scm_module_type = |
338 | scm_permanent_object (SCM_CDR (scm_intern0 ("module-type"))); | |
339 | scm_module_tag = (SCM_CELL_WORD_1 (scm_module_type) + scm_tc3_cons_gloc); | |
1ffa265b MD |
340 | module_prefix = scm_permanent_object (SCM_LIST2 (scm_sym_app, |
341 | scm_sym_modules)); | |
342 | make_modules_in = scm_intern0 ("make-modules-in"); | |
281004cc | 343 | beautify_user_module_x = scm_intern0 ("beautify-user-module!"); |
55000e5f | 344 | the_root_module = scm_intern0 ("the-root-module"); |
c15c33ee MD |
345 | root_module_lookup_closure = scm_permanent_object |
346 | (scm_module_lookup_closure (SCM_CDR (the_root_module))); | |
90184345 | 347 | resolve_module = scm_intern0 ("resolve-module"); |
281004cc | 348 | try_module_autoload = scm_intern0 ("try-module-autoload"); |
e3365c07 | 349 | scm_module_system_booted_p = 1; |
1ffa265b | 350 | } |
89e00824 ML |
351 | |
352 | /* | |
353 | Local Variables: | |
354 | c-file-style: "gnu" | |
355 | End: | |
356 | */ |