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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; | |
63 | ||
281004cc | 64 | static SCM the_root_module; |
c15c33ee | 65 | static SCM root_module_lookup_closure; |
281004cc MD |
66 | |
67 | SCM | |
68 | scm_the_root_module () | |
69 | { | |
70 | return SCM_CDR (the_root_module); | |
71 | } | |
72 | ||
1ffa265b MD |
73 | static SCM the_module; |
74 | ||
75 | SCM | |
aa767bc5 | 76 | scm_current_module () |
1ffa265b | 77 | { |
7f763132 | 78 | return scm_fluid_ref (SCM_CDR (the_module)); |
1ffa265b MD |
79 | } |
80 | ||
81 | static SCM set_current_module; | |
82 | ||
e3365c07 MD |
83 | /* This is the module selected during loading of code. Currently, |
84 | * this is the same as (interaction-environment), but need not be in | |
85 | * the future. | |
86 | */ | |
87 | ||
1ffa265b | 88 | SCM |
aa767bc5 | 89 | scm_set_current_module (SCM module) |
1ffa265b | 90 | { |
aa767bc5 | 91 | SCM old = scm_current_module (); |
1ffa265b MD |
92 | scm_apply (SCM_CDR (set_current_module), SCM_LIST1 (module), SCM_EOL); |
93 | return old; | |
94 | } | |
95 | ||
e3365c07 MD |
96 | SCM_DEFINE (scm_interaction_environment, "interaction-environment", 0, 0, 0, |
97 | (), | |
11768c04 NJ |
98 | "This procedure returns a specifier for the environment that contains\n" |
99 | "implementation-defined bindings, typically a superset of those listed in\n" | |
100 | "the report. The intent is that this procedure will return the\n" | |
101 | "environment in which the implementation would evaluate expressions\n" | |
102 | "dynamically typed by the user.") | |
e3365c07 MD |
103 | #define FUNC_NAME s_scm_interaction_environment |
104 | { | |
aa767bc5 | 105 | return scm_current_module (); |
e3365c07 MD |
106 | } |
107 | #undef FUNC_NAME | |
108 | ||
1ffa265b MD |
109 | SCM_SYMBOL (scm_sym_app, "app"); |
110 | SCM_SYMBOL (scm_sym_modules, "modules"); | |
111 | static SCM module_prefix; | |
112 | ||
113 | static SCM | |
114 | scm_module_full_name (SCM name) | |
115 | { | |
54778cd3 | 116 | if (SCM_EQ_P (SCM_CAR (name), scm_sym_app)) |
1ffa265b MD |
117 | return name; |
118 | else | |
119 | return scm_append (SCM_LIST2 (module_prefix, name)); | |
120 | } | |
121 | ||
122 | static SCM make_modules_in; | |
281004cc | 123 | static SCM beautify_user_module_x; |
1ffa265b MD |
124 | |
125 | SCM | |
126 | scm_make_module (SCM name) | |
127 | { | |
128 | return scm_apply (SCM_CDR (make_modules_in), | |
281004cc | 129 | SCM_LIST2 (scm_the_root_module (), |
1ffa265b MD |
130 | scm_module_full_name (name)), |
131 | SCM_EOL); | |
132 | } | |
133 | ||
281004cc MD |
134 | SCM |
135 | scm_ensure_user_module (SCM module) | |
136 | { | |
137 | scm_apply (SCM_CDR (beautify_user_module_x), SCM_LIST1 (module), SCM_EOL); | |
138 | return SCM_UNSPECIFIED; | |
139 | } | |
140 | ||
1ffa265b MD |
141 | SCM |
142 | scm_module_lookup_closure (SCM module) | |
143 | { | |
e3365c07 | 144 | return SCM_MODULE_EVAL_CLOSURE (module); |
1ffa265b MD |
145 | } |
146 | ||
9e57344b MV |
147 | SCM |
148 | scm_current_module_lookup_closure () | |
149 | { | |
150 | if (scm_module_system_booted_p) | |
151 | return scm_module_lookup_closure (scm_current_module ()); | |
152 | else | |
153 | return SCM_BOOL_F; | |
154 | } | |
155 | ||
90184345 MD |
156 | static SCM resolve_module; |
157 | ||
158 | SCM | |
159 | scm_resolve_module (SCM name) | |
160 | { | |
161 | return scm_apply (SCM_CDR (resolve_module), SCM_LIST1 (name), SCM_EOL); | |
162 | } | |
163 | ||
281004cc MD |
164 | static SCM try_module_autoload; |
165 | ||
166 | SCM | |
167 | scm_load_scheme_module (SCM name) | |
168 | { | |
169 | return scm_apply (SCM_CDR (try_module_autoload), SCM_LIST1 (name), SCM_EOL); | |
170 | } | |
171 | ||
e3365c07 | 172 | /* Environments */ |
d164a5af MD |
173 | |
174 | SCM | |
6e8d25a6 | 175 | scm_top_level_env (SCM thunk) |
d164a5af MD |
176 | { |
177 | if (SCM_IMP (thunk)) | |
178 | return SCM_EOL; | |
179 | else | |
180 | return scm_cons (thunk, SCM_EOL); | |
181 | } | |
182 | ||
183 | SCM | |
184 | scm_env_top_level (SCM env) | |
185 | { | |
186 | while (SCM_NIMP (env)) | |
187 | { | |
188 | if (!SCM_CONSP (SCM_CAR (env)) | |
189 | && SCM_NFALSEP (scm_procedure_p (SCM_CAR (env)))) | |
c15c33ee | 190 | return SCM_CAR (env); |
d164a5af MD |
191 | env = SCM_CDR (env); |
192 | } | |
193 | return SCM_BOOL_F; | |
194 | } | |
195 | ||
196 | ||
197 | SCM_SYMBOL (scm_sym_system_module, "system-module"); | |
198 | ||
199 | SCM | |
200 | scm_system_module_env_p (SCM env) | |
201 | { | |
202 | SCM proc = scm_env_top_level (env); | |
203 | if (SCM_FALSEP (proc)) | |
c15c33ee | 204 | proc = root_module_lookup_closure; |
d164a5af MD |
205 | return ((SCM_NFALSEP (scm_procedure_property (proc, |
206 | scm_sym_system_module))) | |
207 | ? SCM_BOOL_T | |
208 | : SCM_BOOL_F); | |
209 | } | |
210 | ||
152abe96 MD |
211 | /* |
212 | * C level implementation of the standard eval closure | |
213 | * | |
214 | * This increases loading speed substantially. | |
215 | * The code will be replaced by the low-level environments in next release. | |
216 | */ | |
217 | ||
152abe96 MD |
218 | static SCM module_make_local_var_x; |
219 | ||
220 | static SCM | |
221 | module_variable (SCM module, SCM sym) | |
222 | { | |
223 | /* 1. Check module obarray */ | |
e3365c07 | 224 | SCM b = scm_hashq_ref (SCM_MODULE_OBARRAY (module), sym, SCM_UNDEFINED); |
152abe96 MD |
225 | if (SCM_VARIABLEP (b)) |
226 | return b; | |
227 | { | |
e3365c07 | 228 | SCM binder = SCM_MODULE_BINDER (module); |
152abe96 MD |
229 | if (SCM_NFALSEP (binder)) |
230 | /* 2. Custom binder */ | |
231 | { | |
232 | b = scm_apply (binder, | |
233 | SCM_LIST3 (module, sym, SCM_BOOL_F), | |
234 | SCM_EOL); | |
235 | if (SCM_NFALSEP (b)) | |
236 | return b; | |
237 | } | |
238 | } | |
239 | { | |
240 | /* 3. Search the use list */ | |
e3365c07 | 241 | SCM uses = SCM_MODULE_USES (module); |
152abe96 MD |
242 | while (SCM_CONSP (uses)) |
243 | { | |
244 | b = module_variable (SCM_CAR (uses), sym); | |
245 | if (SCM_NFALSEP (b)) | |
246 | return b; | |
247 | uses = SCM_CDR (uses); | |
248 | } | |
249 | return SCM_BOOL_F; | |
250 | } | |
251 | } | |
252 | ||
e841c3e0 | 253 | scm_bits_t scm_tc16_eval_closure; |
152abe96 | 254 | |
fb43bf74 KN |
255 | /* NOTE: This function may be called by a smob application |
256 | or from another C function directly. */ | |
257 | SCM | |
258 | scm_eval_closure_lookup (SCM eclo, SCM sym, SCM definep) | |
152abe96 | 259 | { |
fb43bf74 | 260 | SCM module = SCM_PACK (SCM_SMOB_DATA (eclo)); |
152abe96 MD |
261 | if (SCM_NFALSEP (definep)) |
262 | return scm_apply (SCM_CDR (module_make_local_var_x), | |
263 | SCM_LIST2 (module, sym), | |
264 | SCM_EOL); | |
265 | else | |
266 | return module_variable (module, sym); | |
267 | } | |
268 | ||
269 | SCM_DEFINE (scm_standard_eval_closure, "standard-eval-closure", 1, 0, 0, | |
270 | (SCM module), | |
84526793 | 271 | "Return an eval closure for the module @var{module}.") |
152abe96 MD |
272 | #define FUNC_NAME s_scm_standard_eval_closure |
273 | { | |
e841c3e0 | 274 | SCM_RETURN_NEWSMOB (scm_tc16_eval_closure, SCM_UNPACK (module)); |
152abe96 MD |
275 | } |
276 | #undef FUNC_NAME | |
277 | ||
1ffa265b MD |
278 | void |
279 | scm_init_modules () | |
280 | { | |
8dc9439f | 281 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 282 | #include "libguile/modules.x" |
8dc9439f | 283 | #endif |
152abe96 MD |
284 | module_make_local_var_x = scm_sysintern ("module-make-local-var!", |
285 | SCM_UNDEFINED); | |
e841c3e0 KN |
286 | scm_tc16_eval_closure = scm_make_smob_type ("eval-closure", 0); |
287 | scm_set_smob_mark (scm_tc16_eval_closure, scm_markcdr); | |
288 | scm_set_smob_apply (scm_tc16_eval_closure, scm_eval_closure_lookup, 2, 0, 0); | |
1ffa265b MD |
289 | } |
290 | ||
291 | void | |
292 | scm_post_boot_init_modules () | |
293 | { | |
e3365c07 MD |
294 | scm_module_tag = (SCM_CELL_WORD_1 (SCM_CDR (scm_intern0 ("module-type"))) |
295 | + scm_tc3_cons_gloc); | |
281004cc | 296 | the_root_module = scm_intern0 ("the-root-module"); |
1ffa265b MD |
297 | the_module = scm_intern0 ("the-module"); |
298 | set_current_module = scm_intern0 ("set-current-module"); | |
299 | module_prefix = scm_permanent_object (SCM_LIST2 (scm_sym_app, | |
300 | scm_sym_modules)); | |
301 | make_modules_in = scm_intern0 ("make-modules-in"); | |
281004cc | 302 | beautify_user_module_x = scm_intern0 ("beautify-user-module!"); |
c15c33ee MD |
303 | root_module_lookup_closure = scm_permanent_object |
304 | (scm_module_lookup_closure (SCM_CDR (the_root_module))); | |
90184345 | 305 | resolve_module = scm_intern0 ("resolve-module"); |
281004cc | 306 | try_module_autoload = scm_intern0 ("try-module-autoload"); |
e3365c07 | 307 | scm_module_system_booted_p = 1; |
1ffa265b | 308 | } |
89e00824 ML |
309 | |
310 | /* | |
311 | Local Variables: | |
312 | c-file-style: "gnu" | |
313 | End: | |
314 | */ |