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bab98046 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010 |
b7742c6b AW |
2 | * Free Software Foundation, Inc. |
3 | * | |
4 | * This library is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public License | |
6 | * as published by the Free Software Foundation; either version 3 of | |
7 | * the License, or (at your option) any later version. | |
8 | * | |
9 | * This library is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU Lesser General Public | |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301 USA | |
18 | */ | |
19 | ||
20 | \f | |
21 | ||
22 | #ifdef HAVE_CONFIG_H | |
23 | # include <config.h> | |
24 | #endif | |
25 | ||
b7742c6b | 26 | #include "libguile/__scm.h" |
b7742c6b AW |
27 | #include "libguile/_scm.h" |
28 | #include "libguile/continuations.h" | |
29 | #include "libguile/eq.h" | |
dc3e203e | 30 | #include "libguile/expand.h" |
b7742c6b AW |
31 | #include "libguile/list.h" |
32 | #include "libguile/macros.h" | |
33 | #include "libguile/memoize.h" | |
34 | #include "libguile/modules.h" | |
35 | #include "libguile/srcprop.h" | |
36 | #include "libguile/ports.h" | |
37 | #include "libguile/print.h" | |
38 | #include "libguile/strings.h" | |
39 | #include "libguile/throw.h" | |
40 | #include "libguile/validate.h" | |
41 | ||
42 | ||
43 | \f | |
44 | ||
45 | ||
b7742c6b AW |
46 | #define CAR(x) SCM_CAR(x) |
47 | #define CDR(x) SCM_CDR(x) | |
48 | #define CAAR(x) SCM_CAAR(x) | |
49 | #define CADR(x) SCM_CADR(x) | |
50 | #define CDAR(x) SCM_CDAR(x) | |
51 | #define CDDR(x) SCM_CDDR(x) | |
52 | #define CADDR(x) SCM_CADDR(x) | |
53 | #define CDDDR(x) SCM_CDDDR(x) | |
b7ecadca | 54 | #define CADDDR(x) SCM_CADDDR(x) |
b7742c6b AW |
55 | |
56 | ||
dc3e203e | 57 | SCM_SYMBOL (sym_case_lambda_star, "case-lambda*"); |
b7742c6b AW |
58 | |
59 | \f | |
60 | ||
61 | ||
62 | /* {Evaluator memoized expressions} | |
63 | */ | |
64 | ||
65 | scm_t_bits scm_tc16_memoized; | |
66 | ||
67 | #define MAKMEMO(n, args) (scm_cell (scm_tc16_memoized | ((n) << 16), (scm_t_bits)(args))) | |
68 | ||
69 | #define MAKMEMO_BEGIN(exps) \ | |
70 | MAKMEMO (SCM_M_BEGIN, exps) | |
71 | #define MAKMEMO_IF(test, then, else_) \ | |
72 | MAKMEMO (SCM_M_IF, scm_cons (test, scm_cons (then, else_))) | |
8f9c5b58 AW |
73 | #define FIXED_ARITY(nreq) \ |
74 | scm_list_1 (SCM_I_MAKINUM (nreq)) | |
75 | #define REST_ARITY(nreq, rest) \ | |
76 | scm_list_2 (SCM_I_MAKINUM (nreq), rest) | |
9658182d AW |
77 | #define FULL_ARITY(nreq, rest, nopt, kw, inits, alt) \ |
78 | scm_list_n (SCM_I_MAKINUM (nreq), rest, SCM_I_MAKINUM (nopt), kw, inits, \ | |
79 | alt, SCM_UNDEFINED) | |
8f9c5b58 AW |
80 | #define MAKMEMO_LAMBDA(body, arity) \ |
81 | MAKMEMO (SCM_M_LAMBDA, (scm_cons (body, arity))) | |
b7742c6b AW |
82 | #define MAKMEMO_LET(inits, body) \ |
83 | MAKMEMO (SCM_M_LET, scm_cons (inits, body)) | |
84 | #define MAKMEMO_QUOTE(exp) \ | |
85 | MAKMEMO (SCM_M_QUOTE, exp) | |
86 | #define MAKMEMO_DEFINE(var, val) \ | |
87 | MAKMEMO (SCM_M_DEFINE, scm_cons (var, val)) | |
d69531e2 AW |
88 | #define MAKMEMO_DYNWIND(in, expr, out) \ |
89 | MAKMEMO (SCM_M_DYNWIND, scm_cons (in, scm_cons (expr, out))) | |
bb0229b5 AW |
90 | #define MAKMEMO_WITH_FLUIDS(fluids, vals, expr) \ |
91 | MAKMEMO (SCM_M_WITH_FLUIDS, scm_cons (fluids, scm_cons (vals, expr))) | |
2cd72a84 AW |
92 | #define MAKMEMO_APPLY(proc, args)\ |
93 | MAKMEMO (SCM_M_APPLY, scm_list_2 (proc, args)) | |
b7742c6b AW |
94 | #define MAKMEMO_CONT(proc) \ |
95 | MAKMEMO (SCM_M_CONT, proc) | |
96 | #define MAKMEMO_CALL_WITH_VALUES(prod, cons) \ | |
97 | MAKMEMO (SCM_M_CALL_WITH_VALUES, scm_cons (prod, cons)) | |
9331f91c AW |
98 | #define MAKMEMO_CALL(proc, nargs, args) \ |
99 | MAKMEMO (SCM_M_CALL, scm_cons (proc, scm_cons (SCM_I_MAKINUM (nargs), args))) | |
b7742c6b AW |
100 | #define MAKMEMO_LEX_REF(n) \ |
101 | MAKMEMO (SCM_M_LEXICAL_REF, SCM_I_MAKINUM (n)) | |
102 | #define MAKMEMO_LEX_SET(n, val) \ | |
103 | MAKMEMO (SCM_M_LEXICAL_SET, scm_cons (SCM_I_MAKINUM (n), val)) | |
104 | #define MAKMEMO_TOP_REF(var) \ | |
105 | MAKMEMO (SCM_M_TOPLEVEL_REF, var) | |
106 | #define MAKMEMO_TOP_SET(var, val) \ | |
107 | MAKMEMO (SCM_M_TOPLEVEL_SET, scm_cons (var, val)) | |
108 | #define MAKMEMO_MOD_REF(mod, var, public) \ | |
109 | MAKMEMO (SCM_M_MODULE_REF, scm_cons (mod, scm_cons (var, public))) | |
110 | #define MAKMEMO_MOD_SET(val, mod, var, public) \ | |
111 | MAKMEMO (SCM_M_MODULE_SET, scm_cons (val, scm_cons (mod, scm_cons (var, public)))) | |
747022e4 AW |
112 | #define MAKMEMO_PROMPT(tag, exp, handler) \ |
113 | MAKMEMO (SCM_M_PROMPT, scm_cons (tag, scm_cons (exp, handler))) | |
b7742c6b | 114 | |
2cd72a84 AW |
115 | |
116 | /* Primitives for the evaluator */ | |
117 | scm_t_bits scm_tc16_memoizer; | |
118 | #define SCM_MEMOIZER_P(x) (SCM_SMOB_PREDICATE (scm_tc16_memoizer, (x))) | |
119 | #define SCM_MEMOIZER(M) (SCM_SMOB_OBJECT_1 (M)) | |
120 | ||
b7742c6b AW |
121 | \f |
122 | ||
123 | /* This table must agree with the list of M_ constants in memoize.h */ | |
124 | static const char *const memoized_tags[] = | |
125 | { | |
126 | "begin", | |
127 | "if", | |
128 | "lambda", | |
129 | "let", | |
130 | "quote", | |
131 | "define", | |
d69531e2 | 132 | "dynwind", |
bb0229b5 | 133 | "with-fluids", |
b7742c6b | 134 | "apply", |
3149a5b6 | 135 | "call/cc", |
b7742c6b AW |
136 | "call-with-values", |
137 | "call", | |
138 | "lexical-ref", | |
139 | "lexical-set!", | |
140 | "toplevel-ref", | |
141 | "toplevel-set!", | |
142 | "module-ref", | |
3149a5b6 | 143 | "module-set!", |
747022e4 | 144 | "prompt", |
b7742c6b AW |
145 | }; |
146 | ||
147 | static int | |
148 | scm_print_memoized (SCM memoized, SCM port, scm_print_state *pstate) | |
149 | { | |
150 | scm_puts ("#<memoized ", port); | |
151 | scm_write (scm_unmemoize_expression (memoized), port); | |
152 | scm_puts (">", port); | |
153 | return 1; | |
154 | } | |
155 | ||
b7742c6b | 156 | |
b7742c6b AW |
157 | \f |
158 | ||
159 | ||
b7742c6b | 160 | static int |
dc3e203e | 161 | lookup (SCM x, SCM env) |
b7742c6b AW |
162 | { |
163 | int i = 0; | |
164 | for (; scm_is_pair (env); env = CDR (env), i++) | |
165 | if (scm_is_eq (x, CAR (env))) | |
166 | return i; /* bound */ | |
dc3e203e | 167 | abort (); |
b7742c6b AW |
168 | } |
169 | ||
b7742c6b | 170 | |
dc3e203e AW |
171 | /* Abbreviate SCM_EXPANDED_REF. Copied because I'm not sure about symbol pasting */ |
172 | #define REF(x,type,field) \ | |
173 | (scm_struct_ref (x, SCM_I_MAKINUM (SCM_EXPANDED_##type##_##field))) | |
b7742c6b | 174 | |
dc3e203e | 175 | static SCM list_of_guile = SCM_BOOL_F; |
b7742c6b | 176 | |
dc3e203e | 177 | static SCM memoize (SCM exp, SCM env); |
b7742c6b AW |
178 | |
179 | static SCM | |
dc3e203e | 180 | memoize_exps (SCM exps, SCM env) |
b7742c6b | 181 | { |
dc3e203e AW |
182 | SCM ret; |
183 | for (ret = SCM_EOL; scm_is_pair (exps); exps = CDR (exps)) | |
184 | ret = scm_cons (memoize (CAR (exps), env), ret); | |
185 | return scm_reverse_x (ret, SCM_UNDEFINED); | |
7572ee52 | 186 | } |
7572ee52 | 187 | |
7572ee52 | 188 | static SCM |
dc3e203e | 189 | memoize (SCM exp, SCM env) |
b7742c6b | 190 | { |
dc3e203e AW |
191 | if (!SCM_EXPANDED_P (exp)) |
192 | abort (); | |
b7742c6b | 193 | |
dc3e203e | 194 | switch (SCM_EXPANDED_TYPE (exp)) |
b7742c6b | 195 | { |
dc3e203e AW |
196 | case SCM_EXPANDED_VOID: |
197 | return MAKMEMO_QUOTE (SCM_UNSPECIFIED); | |
198 | ||
199 | case SCM_EXPANDED_CONST: | |
200 | return MAKMEMO_QUOTE (REF (exp, CONST, EXP)); | |
b7742c6b | 201 | |
dc3e203e AW |
202 | case SCM_EXPANDED_PRIMITIVE_REF: |
203 | if (scm_is_eq (scm_current_module (), scm_the_root_module ())) | |
204 | return MAKMEMO_TOP_REF (REF (exp, PRIMITIVE_REF, NAME)); | |
205 | else | |
206 | return MAKMEMO_MOD_REF (list_of_guile, REF (exp, PRIMITIVE_REF, NAME), | |
207 | SCM_BOOL_F); | |
208 | ||
209 | case SCM_EXPANDED_LEXICAL_REF: | |
210 | return MAKMEMO_LEX_REF (lookup (REF (exp, LEXICAL_REF, GENSYM), env)); | |
211 | ||
212 | case SCM_EXPANDED_LEXICAL_SET: | |
213 | return MAKMEMO_LEX_SET (lookup (REF (exp, LEXICAL_SET, GENSYM), env), | |
214 | memoize (REF (exp, LEXICAL_SET, EXP), env)); | |
215 | ||
216 | case SCM_EXPANDED_MODULE_REF: | |
217 | return MAKMEMO_MOD_REF (REF (exp, MODULE_REF, MOD), | |
218 | REF (exp, MODULE_REF, NAME), | |
219 | REF (exp, MODULE_REF, PUBLIC)); | |
220 | ||
221 | case SCM_EXPANDED_MODULE_SET: | |
222 | return MAKMEMO_MOD_SET (memoize (REF (exp, MODULE_SET, EXP), env), | |
223 | REF (exp, MODULE_SET, MOD), | |
224 | REF (exp, MODULE_SET, NAME), | |
225 | REF (exp, MODULE_SET, PUBLIC)); | |
226 | ||
227 | case SCM_EXPANDED_TOPLEVEL_REF: | |
228 | return MAKMEMO_TOP_REF (REF (exp, TOPLEVEL_REF, NAME)); | |
229 | ||
230 | case SCM_EXPANDED_TOPLEVEL_SET: | |
231 | return MAKMEMO_TOP_SET (REF (exp, TOPLEVEL_SET, NAME), | |
232 | memoize (REF (exp, TOPLEVEL_SET, EXP), env)); | |
233 | ||
234 | case SCM_EXPANDED_TOPLEVEL_DEFINE: | |
235 | return MAKMEMO_DEFINE (REF (exp, TOPLEVEL_DEFINE, NAME), | |
236 | memoize (REF (exp, TOPLEVEL_DEFINE, EXP), env)); | |
237 | ||
238 | case SCM_EXPANDED_CONDITIONAL: | |
239 | return MAKMEMO_IF (memoize (REF (exp, CONDITIONAL, TEST), env), | |
240 | memoize (REF (exp, CONDITIONAL, CONSEQUENT), env), | |
241 | memoize (REF (exp, CONDITIONAL, ALTERNATE), env)); | |
242 | ||
243 | case SCM_EXPANDED_APPLICATION: | |
244 | { | |
245 | SCM proc, args; | |
b7742c6b | 246 | |
dc3e203e | 247 | proc = REF (exp, APPLICATION, PROC); |
e1ca9100 | 248 | args = memoize_exps (REF (exp, APPLICATION, ARGS), env); |
b7742c6b | 249 | |
dc3e203e AW |
250 | if (SCM_EXPANDED_TYPE (proc) == SCM_EXPANDED_TOPLEVEL_REF) |
251 | { | |
252 | SCM var = scm_module_variable (scm_current_module (), | |
253 | REF (proc, TOPLEVEL_REF, NAME)); | |
254 | if (SCM_VARIABLEP (var)) | |
255 | { | |
256 | SCM val = SCM_VARIABLE_REF (var); | |
257 | if (SCM_MEMOIZER_P (val)) | |
258 | return scm_apply (SCM_SMOB_OBJECT_1 (val), args, SCM_EOL); | |
259 | } | |
260 | } | |
261 | /* otherwise we all fall down here */ | |
262 | return MAKMEMO_CALL (memoize (proc, env), scm_ilength (args), args); | |
263 | } | |
b7742c6b | 264 | |
dc3e203e AW |
265 | case SCM_EXPANDED_SEQUENCE: |
266 | return MAKMEMO_BEGIN (memoize_exps (REF (exp, SEQUENCE, EXPS), env)); | |
b7742c6b | 267 | |
dc3e203e AW |
268 | case SCM_EXPANDED_LAMBDA: |
269 | /* The body will be a lambda-case. */ | |
270 | return memoize (REF (exp, LAMBDA, BODY), env); | |
b7742c6b | 271 | |
dc3e203e AW |
272 | case SCM_EXPANDED_LAMBDA_CASE: |
273 | { | |
274 | SCM req, rest, opt, kw, inits, vars, body, alt; | |
275 | SCM walk, minits, arity, new_env; | |
632ddbf0 | 276 | int nreq, nopt, ntotal; |
dc3e203e AW |
277 | |
278 | req = REF (exp, LAMBDA_CASE, REQ); | |
279 | rest = REF (exp, LAMBDA_CASE, REST); | |
280 | opt = REF (exp, LAMBDA_CASE, OPT); | |
281 | kw = REF (exp, LAMBDA_CASE, KW); | |
282 | inits = REF (exp, LAMBDA_CASE, INITS); | |
283 | vars = REF (exp, LAMBDA_CASE, GENSYMS); | |
284 | body = REF (exp, LAMBDA_CASE, BODY); | |
285 | alt = REF (exp, LAMBDA_CASE, ALTERNATE); | |
286 | ||
287 | nreq = scm_ilength (req); | |
288 | nopt = scm_is_pair (opt) ? scm_ilength (opt) : 0; | |
632ddbf0 | 289 | ntotal = scm_ilength (vars); |
dc3e203e AW |
290 | |
291 | /* The vars are the gensyms, according to the divine plan. But we need | |
292 | to memoize the inits within their appropriate environment, | |
293 | complicating things. */ | |
294 | new_env = env; | |
295 | for (walk = req; scm_is_pair (walk); | |
296 | walk = CDR (walk), vars = CDR (vars)) | |
297 | new_env = scm_cons (CAR (vars), new_env); | |
298 | ||
299 | minits = SCM_EOL; | |
300 | for (walk = opt; scm_is_pair (walk); | |
301 | walk = CDR (walk), vars = CDR (vars), inits = CDR (inits)) | |
302 | { | |
303 | minits = scm_cons (memoize (CAR (inits), new_env), minits); | |
304 | new_env = scm_cons (CAR (vars), new_env); | |
305 | } | |
b7742c6b | 306 | |
dc3e203e AW |
307 | if (scm_is_true (rest)) |
308 | { | |
309 | new_env = scm_cons (CAR (vars), new_env); | |
310 | vars = CDR (vars); | |
311 | } | |
b7742c6b | 312 | |
dc3e203e AW |
313 | for (; scm_is_pair (inits); vars = CDR (vars), inits = CDR (inits)) |
314 | { | |
315 | minits = scm_cons (memoize (CAR (inits), new_env), minits); | |
316 | new_env = scm_cons (CAR (vars), new_env); | |
317 | } | |
318 | if (!scm_is_null (vars)) | |
319 | abort (); | |
b7742c6b | 320 | |
dc3e203e | 321 | minits = scm_reverse_x (minits, SCM_UNDEFINED); |
b7742c6b | 322 | |
632ddbf0 AW |
323 | if (scm_is_true (kw)) |
324 | { | |
325 | /* (aok? (kw name sym) ...) -> (aok? (kw . index) ...) */ | |
326 | SCM aok = CAR (kw), indices = SCM_EOL; | |
327 | for (kw = CDR (kw); scm_is_pair (kw); kw = CDR (kw)) | |
328 | { | |
329 | SCM k; | |
330 | int idx; | |
331 | ||
332 | k = CAR (CAR (kw)); | |
333 | idx = ntotal - 1 - lookup (CADDR (CAR (kw)), new_env); | |
334 | indices = scm_acons (k, SCM_I_MAKINUM (idx), indices); | |
335 | } | |
336 | kw = scm_cons (aok, scm_reverse_x (indices, SCM_UNDEFINED)); | |
337 | } | |
338 | ||
dc3e203e AW |
339 | if (scm_is_false (alt) && scm_is_false (kw) && scm_is_false (opt)) |
340 | { | |
341 | if (scm_is_false (rest)) | |
342 | arity = FIXED_ARITY (nreq); | |
343 | else | |
344 | arity = REST_ARITY (nreq, SCM_BOOL_T); | |
345 | } | |
346 | else if (scm_is_true (alt)) | |
347 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, | |
348 | SCM_MEMOIZED_ARGS (memoize (alt, env))); | |
349 | else | |
350 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, SCM_BOOL_F); | |
b7742c6b | 351 | |
dc3e203e AW |
352 | return MAKMEMO_LAMBDA (memoize (body, new_env), arity); |
353 | } | |
b7742c6b | 354 | |
dc3e203e AW |
355 | case SCM_EXPANDED_LET: |
356 | { | |
357 | SCM vars, exps, body, inits, new_env; | |
358 | ||
359 | vars = REF (exp, LET, GENSYMS); | |
360 | exps = REF (exp, LET, VALS); | |
361 | body = REF (exp, LET, BODY); | |
362 | ||
363 | inits = SCM_EOL; | |
364 | new_env = env; | |
365 | for (; scm_is_pair (vars); vars = CDR (vars), exps = CDR (exps)) | |
366 | { | |
367 | new_env = scm_cons (CAR (vars), new_env); | |
368 | inits = scm_cons (memoize (CAR (exps), env), inits); | |
369 | } | |
b7742c6b | 370 | |
dc3e203e AW |
371 | return MAKMEMO_LET (scm_reverse_x (inits, SCM_UNDEFINED), |
372 | memoize (body, new_env)); | |
373 | } | |
b7742c6b | 374 | |
dc3e203e AW |
375 | case SCM_EXPANDED_LETREC: |
376 | { | |
826373a2 AW |
377 | SCM vars, exps, body, undefs, new_env; |
378 | int i, nvars, in_order_p; | |
dc3e203e | 379 | |
f238862e AW |
380 | vars = REF (exp, LETREC, GENSYMS); |
381 | exps = REF (exp, LETREC, VALS); | |
382 | body = REF (exp, LETREC, BODY); | |
826373a2 | 383 | in_order_p = scm_is_true (REF (exp, LETREC, IN_ORDER_P)); |
dc3e203e | 384 | nvars = i = scm_ilength (vars); |
826373a2 | 385 | undefs = SCM_EOL; |
dc3e203e AW |
386 | new_env = env; |
387 | ||
826373a2 | 388 | for (; scm_is_pair (vars); vars = CDR (vars)) |
dc3e203e AW |
389 | { |
390 | new_env = scm_cons (CAR (vars), new_env); | |
391 | undefs = scm_cons (MAKMEMO_QUOTE (SCM_UNDEFINED), undefs); | |
dc3e203e | 392 | } |
b7742c6b | 393 | |
826373a2 AW |
394 | if (in_order_p) |
395 | { | |
396 | SCM body_exps = SCM_EOL; | |
397 | for (; scm_is_pair (exps); exps = CDR (exps), i--) | |
398 | body_exps = scm_cons (MAKMEMO_LEX_SET (i-1, | |
399 | memoize (CAR (exps), new_env)), | |
400 | body_exps); | |
401 | body_exps = scm_cons (memoize (body, new_env), body_exps); | |
402 | body_exps = scm_reverse_x (body_exps, SCM_UNDEFINED); | |
403 | return MAKMEMO_LET (undefs, MAKMEMO_BEGIN (body_exps)); | |
404 | } | |
405 | else | |
406 | { | |
407 | SCM sets = SCM_EOL, inits = SCM_EOL; | |
408 | for (; scm_is_pair (exps); exps = CDR (exps), i--) | |
409 | { | |
410 | sets = scm_cons (MAKMEMO_LEX_SET ((i-1) + nvars, | |
411 | MAKMEMO_LEX_REF (i-1)), | |
412 | sets); | |
413 | inits = scm_cons (memoize (CAR (exps), new_env), inits); | |
414 | } | |
415 | inits = scm_reverse_x (inits, SCM_UNDEFINED); | |
416 | return MAKMEMO_LET | |
417 | (undefs, | |
418 | MAKMEMO_BEGIN (scm_list_2 (MAKMEMO_LET (inits, MAKMEMO_BEGIN (sets)), | |
419 | memoize (body, new_env)))); | |
420 | } | |
dc3e203e | 421 | } |
b7742c6b | 422 | |
dc3e203e AW |
423 | case SCM_EXPANDED_DYNLET: |
424 | return MAKMEMO_WITH_FLUIDS (memoize_exps (REF (exp, DYNLET, FLUIDS), env), | |
425 | memoize_exps (REF (exp, DYNLET, VALS), env), | |
426 | memoize (REF (exp, DYNLET, BODY), env)); | |
b7742c6b | 427 | |
b7742c6b | 428 | default: |
dc3e203e | 429 | abort (); |
b7742c6b AW |
430 | } |
431 | } | |
432 | ||
433 | ||
434 | \f | |
435 | ||
436 | SCM_DEFINE (scm_memoize_expression, "memoize-expression", 1, 0, 0, | |
437 | (SCM exp), | |
438 | "Memoize the expression @var{exp}.") | |
439 | #define FUNC_NAME s_scm_memoize_expression | |
440 | { | |
a310a1d1 | 441 | SCM_ASSERT_TYPE (SCM_EXPANDED_P (exp), exp, 1, FUNC_NAME, "expanded"); |
b7742c6b AW |
442 | return memoize (exp, scm_current_module ()); |
443 | } | |
444 | #undef FUNC_NAME | |
445 | ||
2cd72a84 | 446 | |
b7742c6b AW |
447 | \f |
448 | ||
2cd72a84 AW |
449 | #define SCM_MAKE_MEMOIZER(STR, MEMOIZER, N) \ |
450 | (scm_cell (scm_tc16_memoizer, \ | |
451 | (scm_t_bits)(scm_c_make_gsubr (STR, N, 0, 0, MEMOIZER)))) | |
452 | #define SCM_DEFINE_MEMOIZER(STR, MEMOIZER, N) \ | |
453 | SCM_SNARF_INIT(scm_c_define (STR, SCM_MAKE_MEMOIZER (STR, MEMOIZER, N))) | |
454 | ||
455 | static SCM m_apply (SCM proc, SCM args); | |
456 | static SCM m_call_cc (SCM proc); | |
457 | static SCM m_call_values (SCM prod, SCM cons); | |
458 | static SCM m_dynamic_wind (SCM pre, SCM exp, SCM post); | |
459 | static SCM m_prompt (SCM tag, SCM exp, SCM handler); | |
460 | ||
461 | SCM_DEFINE_MEMOIZER ("@apply", m_apply, 2); | |
462 | SCM_DEFINE_MEMOIZER ("@call-with-current-continuation", m_call_cc, 1); | |
463 | SCM_DEFINE_MEMOIZER ("@call-with-values", m_call_values, 2); | |
464 | SCM_DEFINE_MEMOIZER ("@dynamic-wind", m_dynamic_wind, 3); | |
465 | SCM_DEFINE_MEMOIZER ("@prompt", m_prompt, 3); | |
466 | ||
467 | ||
468 | \f | |
469 | ||
470 | static SCM m_apply (SCM proc, SCM args) | |
471 | #define FUNC_NAME "@apply" | |
472 | { | |
473 | SCM_VALIDATE_MEMOIZED (1, proc); | |
474 | SCM_VALIDATE_MEMOIZED (2, args); | |
475 | return MAKMEMO_APPLY (proc, args); | |
476 | } | |
477 | #undef FUNC_NAME | |
478 | ||
479 | static SCM m_call_cc (SCM proc) | |
480 | #define FUNC_NAME "@call-with-current-continuation" | |
481 | { | |
482 | SCM_VALIDATE_MEMOIZED (1, proc); | |
483 | return MAKMEMO_CONT (proc); | |
484 | } | |
485 | #undef FUNC_NAME | |
486 | ||
487 | static SCM m_call_values (SCM prod, SCM cons) | |
488 | #define FUNC_NAME "@call-with-values" | |
489 | { | |
490 | SCM_VALIDATE_MEMOIZED (1, prod); | |
491 | SCM_VALIDATE_MEMOIZED (2, cons); | |
492 | return MAKMEMO_CALL_WITH_VALUES (prod, cons); | |
493 | } | |
494 | #undef FUNC_NAME | |
495 | ||
496 | static SCM m_dynamic_wind (SCM in, SCM expr, SCM out) | |
497 | #define FUNC_NAME "memoize-dynwind" | |
498 | { | |
499 | SCM_VALIDATE_MEMOIZED (1, in); | |
500 | SCM_VALIDATE_MEMOIZED (2, expr); | |
501 | SCM_VALIDATE_MEMOIZED (3, out); | |
502 | return MAKMEMO_DYNWIND (in, expr, out); | |
503 | } | |
504 | #undef FUNC_NAME | |
505 | ||
506 | static SCM m_prompt (SCM tag, SCM exp, SCM handler) | |
507 | #define FUNC_NAME "@prompt" | |
508 | { | |
509 | SCM_VALIDATE_MEMOIZED (1, tag); | |
510 | SCM_VALIDATE_MEMOIZED (2, exp); | |
511 | SCM_VALIDATE_MEMOIZED (3, handler); | |
512 | return MAKMEMO_PROMPT (tag, exp, handler); | |
513 | } | |
514 | #undef FUNC_NAME | |
515 | ||
2cd72a84 AW |
516 | |
517 | \f | |
b7742c6b AW |
518 | |
519 | SCM_SYMBOL (sym_placeholder, "_"); | |
520 | ||
521 | static SCM unmemoize (SCM expr); | |
522 | ||
523 | static SCM | |
524 | unmemoize_exprs (SCM exprs) | |
525 | { | |
526 | SCM ret, tail; | |
527 | if (scm_is_null (exprs)) | |
528 | return SCM_EOL; | |
529 | ret = scm_list_1 (unmemoize (CAR (exprs))); | |
530 | tail = ret; | |
531 | for (exprs = CDR (exprs); !scm_is_null (exprs); exprs = CDR (exprs)) | |
532 | { | |
533 | SCM_SETCDR (tail, scm_list_1 (unmemoize (CAR (exprs)))); | |
534 | tail = CDR (tail); | |
535 | } | |
536 | return ret; | |
537 | } | |
538 | ||
539 | static SCM | |
540 | unmemoize_bindings (SCM inits) | |
541 | { | |
542 | SCM ret, tail; | |
543 | if (scm_is_null (inits)) | |
544 | return SCM_EOL; | |
545 | ret = scm_list_1 (scm_list_2 (sym_placeholder, unmemoize (CAR (inits)))); | |
546 | tail = ret; | |
547 | for (inits = CDR (inits); !scm_is_null (inits); inits = CDR (inits)) | |
548 | { | |
549 | SCM_SETCDR (tail, scm_list_1 (scm_list_2 (sym_placeholder, | |
550 | unmemoize (CAR (inits))))); | |
551 | tail = CDR (tail); | |
552 | } | |
553 | return ret; | |
554 | } | |
555 | ||
556 | static SCM | |
557 | unmemoize_lexical (SCM n) | |
558 | { | |
559 | char buf[16]; | |
560 | buf[15] = 0; | |
561 | snprintf (buf, 15, "<%u>", scm_to_uint32 (n)); | |
562 | return scm_from_locale_symbol (buf); | |
563 | } | |
564 | ||
565 | static SCM | |
566 | unmemoize (const SCM expr) | |
567 | { | |
568 | SCM args; | |
569 | ||
570 | if (!SCM_MEMOIZED_P (expr)) | |
571 | abort (); | |
572 | ||
573 | args = SCM_MEMOIZED_ARGS (expr); | |
574 | switch (SCM_MEMOIZED_TAG (expr)) | |
575 | { | |
576 | case SCM_M_APPLY: | |
577 | return scm_cons (scm_sym_atapply, unmemoize_exprs (args)); | |
578 | case SCM_M_BEGIN: | |
579 | return scm_cons (scm_sym_begin, unmemoize_exprs (args)); | |
580 | case SCM_M_CALL: | |
9331f91c | 581 | return scm_cons (unmemoize (CAR (args)), unmemoize_exprs (CDDR (args))); |
b7742c6b AW |
582 | case SCM_M_CONT: |
583 | return scm_list_2 (scm_sym_atcall_cc, unmemoize (args)); | |
584 | case SCM_M_CALL_WITH_VALUES: | |
585 | return scm_list_3 (scm_sym_at_call_with_values, | |
586 | unmemoize (CAR (args)), unmemoize (CDR (args))); | |
587 | case SCM_M_DEFINE: | |
588 | return scm_list_3 (scm_sym_define, CAR (args), unmemoize (CDR (args))); | |
d69531e2 AW |
589 | case SCM_M_DYNWIND: |
590 | return scm_list_4 (scm_sym_at_dynamic_wind, | |
591 | unmemoize (CAR (args)), | |
592 | unmemoize (CADR (args)), | |
593 | unmemoize (CDDR (args))); | |
bb0229b5 AW |
594 | case SCM_M_WITH_FLUIDS: |
595 | { | |
596 | SCM binds = SCM_EOL, fluids, vals; | |
597 | for (fluids = CAR (args), vals = CADR (args); scm_is_pair (fluids); | |
598 | fluids = CDR (fluids), vals = CDR (vals)) | |
599 | binds = scm_cons (scm_list_2 (unmemoize (CAR (fluids)), | |
600 | unmemoize (CAR (vals))), | |
601 | binds); | |
602 | return scm_list_3 (scm_sym_with_fluids, | |
603 | scm_reverse_x (binds, SCM_UNDEFINED), | |
604 | unmemoize (CDDR (args))); | |
605 | } | |
b7742c6b AW |
606 | case SCM_M_IF: |
607 | return scm_list_4 (scm_sym_if, unmemoize (scm_car (args)), | |
608 | unmemoize (scm_cadr (args)), unmemoize (scm_cddr (args))); | |
609 | case SCM_M_LAMBDA: | |
8f9c5b58 AW |
610 | if (scm_is_null (CDDR (args))) |
611 | return scm_list_3 (scm_sym_lambda, | |
612 | scm_make_list (CADR (args), sym_placeholder), | |
613 | unmemoize (CAR (args))); | |
614 | else if (scm_is_null (CDDDR (args))) | |
615 | { | |
616 | SCM formals = scm_make_list (CADR (args), sym_placeholder); | |
617 | return scm_list_3 (scm_sym_lambda, | |
618 | scm_is_true (CADDR (args)) | |
619 | ? scm_cons_star (sym_placeholder, formals) | |
620 | : formals, | |
621 | unmemoize (CAR (args))); | |
622 | } | |
623 | else | |
9658182d | 624 | { |
7572ee52 | 625 | SCM body = CAR (args), spec = CDR (args), alt, tail; |
9658182d AW |
626 | |
627 | alt = CADDR (CDDDR (spec)); | |
628 | if (scm_is_true (alt)) | |
7572ee52 AW |
629 | tail = CDR (unmemoize (alt)); |
630 | else | |
631 | tail = SCM_EOL; | |
9658182d | 632 | |
7572ee52 AW |
633 | return scm_cons |
634 | (sym_case_lambda_star, | |
635 | scm_cons (scm_list_2 (scm_list_5 (CAR (spec), | |
636 | CADR (spec), | |
637 | CADDR (spec), | |
638 | CADDDR (spec), | |
639 | unmemoize_exprs (CADR (CDDDR (spec)))), | |
640 | unmemoize (body)), | |
641 | tail)); | |
9658182d | 642 | } |
b7742c6b AW |
643 | case SCM_M_LET: |
644 | return scm_list_3 (scm_sym_let, | |
645 | unmemoize_bindings (CAR (args)), | |
646 | unmemoize (CDR (args))); | |
647 | case SCM_M_QUOTE: | |
648 | return scm_list_2 (scm_sym_quote, args); | |
649 | case SCM_M_LEXICAL_REF: | |
650 | return unmemoize_lexical (args); | |
651 | case SCM_M_LEXICAL_SET: | |
652 | return scm_list_3 (scm_sym_set_x, unmemoize_lexical (CAR (args)), | |
653 | unmemoize (CDR (args))); | |
654 | case SCM_M_TOPLEVEL_REF: | |
655 | return args; | |
656 | case SCM_M_TOPLEVEL_SET: | |
657 | return scm_list_3 (scm_sym_set_x, CAR (args), unmemoize (CDR (args))); | |
658 | case SCM_M_MODULE_REF: | |
c08899ff AW |
659 | return SCM_VARIABLEP (args) ? args |
660 | : scm_list_3 (scm_is_true (CDDR (args)) ? scm_sym_at : scm_sym_atat, | |
661 | scm_i_finite_list_copy (CAR (args)), | |
662 | CADR (args)); | |
b7742c6b AW |
663 | case SCM_M_MODULE_SET: |
664 | return scm_list_3 (scm_sym_set_x, | |
c08899ff AW |
665 | SCM_VARIABLEP (CDR (args)) ? CDR (args) |
666 | : scm_list_3 (scm_is_true (CDDDR (args)) | |
667 | ? scm_sym_at : scm_sym_atat, | |
668 | scm_i_finite_list_copy (CADR (args)), | |
669 | CADDR (args)), | |
b7742c6b | 670 | unmemoize (CAR (args))); |
747022e4 AW |
671 | case SCM_M_PROMPT: |
672 | return scm_list_4 (scm_sym_at_prompt, | |
673 | unmemoize (CAR (args)), | |
674 | unmemoize (CADR (args)), | |
675 | unmemoize (CDDR (args))); | |
b7742c6b AW |
676 | default: |
677 | abort (); | |
678 | } | |
679 | } | |
680 | ||
2cd72a84 AW |
681 | |
682 | \f | |
683 | ||
b7742c6b AW |
684 | SCM_DEFINE (scm_memoized_p, "memoized?", 1, 0, 0, |
685 | (SCM obj), | |
686 | "Return @code{#t} if @var{obj} is memoized.") | |
687 | #define FUNC_NAME s_scm_memoized_p | |
688 | { | |
689 | return scm_from_bool (SCM_MEMOIZED_P (obj)); | |
690 | } | |
691 | #undef FUNC_NAME | |
692 | ||
693 | SCM_DEFINE (scm_unmemoize_expression, "unmemoize-expression", 1, 0, 0, | |
694 | (SCM m), | |
695 | "Unmemoize the memoized expression @var{m}.") | |
696 | #define FUNC_NAME s_scm_unmemoize_expression | |
697 | { | |
698 | SCM_VALIDATE_MEMOIZED (1, m); | |
699 | return unmemoize (m); | |
700 | } | |
701 | #undef FUNC_NAME | |
702 | ||
3149a5b6 AW |
703 | SCM_DEFINE (scm_memoized_expression_typecode, "memoized-expression-typecode", 1, 0, 0, |
704 | (SCM m), | |
705 | "Return the typecode from the memoized expression @var{m}.") | |
706 | #define FUNC_NAME s_scm_memoized_expression_typecode | |
707 | { | |
708 | SCM_VALIDATE_MEMOIZED (1, m); | |
b7ecadca LC |
709 | |
710 | /* The tag is a 16-bit integer so it fits in an inum. */ | |
711 | return SCM_I_MAKINUM (SCM_MEMOIZED_TAG (m)); | |
3149a5b6 AW |
712 | } |
713 | #undef FUNC_NAME | |
714 | ||
715 | SCM_DEFINE (scm_memoized_expression_data, "memoized-expression-data", 1, 0, 0, | |
716 | (SCM m), | |
717 | "Return the data from the memoized expression @var{m}.") | |
718 | #define FUNC_NAME s_scm_memoized_expression_data | |
719 | { | |
720 | SCM_VALIDATE_MEMOIZED (1, m); | |
721 | return SCM_MEMOIZED_ARGS (m); | |
722 | } | |
723 | #undef FUNC_NAME | |
724 | ||
725 | SCM_DEFINE (scm_memoized_typecode, "memoized-typecode", 1, 0, 0, | |
726 | (SCM sym), | |
727 | "Return the memoized typecode corresponding to the symbol @var{sym}.") | |
728 | #define FUNC_NAME s_scm_memoized_typecode | |
729 | { | |
730 | int i; | |
731 | ||
732 | SCM_VALIDATE_SYMBOL (1, sym); | |
733 | ||
734 | for (i = 0; i < sizeof(memoized_tags)/sizeof(const char*); i++) | |
735 | if (strcmp (scm_i_symbol_chars (sym), memoized_tags[i]) == 0) | |
736 | return scm_from_int32 (i); | |
737 | ||
738 | return SCM_BOOL_F; | |
739 | } | |
740 | #undef FUNC_NAME | |
741 | ||
742 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
743 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
744 | static void error_unbound_variable (SCM symbol) | |
745 | { | |
746 | scm_error (scm_unbound_variable_key, NULL, "Unbound variable: ~S", | |
747 | scm_list_1 (symbol), SCM_BOOL_F); | |
748 | } | |
749 | ||
750 | SCM_DEFINE (scm_memoize_variable_access_x, "memoize-variable-access!", 2, 0, 0, | |
751 | (SCM m, SCM mod), | |
752 | "Look up and cache the variable that @var{m} will access, returning the variable.") | |
7230aaf9 | 753 | #define FUNC_NAME s_scm_memoize_variable_access_x |
3149a5b6 AW |
754 | { |
755 | SCM mx; | |
756 | SCM_VALIDATE_MEMOIZED (1, m); | |
757 | mx = SCM_MEMOIZED_ARGS (m); | |
758 | switch (SCM_MEMOIZED_TAG (m)) | |
759 | { | |
760 | case SCM_M_TOPLEVEL_REF: | |
761 | if (SCM_VARIABLEP (mx)) | |
762 | return mx; | |
763 | else | |
764 | { | |
765 | SCM var = scm_module_variable (mod, mx); | |
766 | if (scm_is_false (var) || scm_is_false (scm_variable_bound_p (var))) | |
767 | error_unbound_variable (mx); | |
768 | SCM_SET_SMOB_OBJECT (m, var); | |
769 | return var; | |
770 | } | |
771 | ||
772 | case SCM_M_TOPLEVEL_SET: | |
773 | { | |
774 | SCM var = CAR (mx); | |
775 | if (SCM_VARIABLEP (var)) | |
776 | return var; | |
777 | else | |
778 | { | |
779 | var = scm_module_variable (mod, var); | |
780 | if (scm_is_false (var)) | |
781 | error_unbound_variable (CAR (mx)); | |
782 | SCM_SETCAR (mx, var); | |
783 | return var; | |
784 | } | |
785 | } | |
786 | ||
787 | case SCM_M_MODULE_REF: | |
788 | if (SCM_VARIABLEP (mx)) | |
789 | return mx; | |
790 | else | |
791 | { | |
792 | SCM var; | |
793 | mod = scm_resolve_module (CAR (mx)); | |
794 | if (scm_is_true (CDDR (mx))) | |
795 | mod = scm_module_public_interface (mod); | |
796 | var = scm_module_lookup (mod, CADR (mx)); | |
797 | if (scm_is_false (scm_variable_bound_p (var))) | |
798 | error_unbound_variable (CADR (mx)); | |
799 | SCM_SET_SMOB_OBJECT (m, var); | |
800 | return var; | |
801 | } | |
802 | ||
803 | case SCM_M_MODULE_SET: | |
804 | /* FIXME: not quite threadsafe */ | |
805 | if (SCM_VARIABLEP (CDR (mx))) | |
806 | return CDR (mx); | |
807 | else | |
808 | { | |
809 | SCM var; | |
810 | mod = scm_resolve_module (CADR (mx)); | |
811 | if (scm_is_true (CDDDR (mx))) | |
812 | mod = scm_module_public_interface (mod); | |
813 | var = scm_module_lookup (mod, CADDR (mx)); | |
814 | SCM_SETCDR (mx, var); | |
815 | return var; | |
816 | } | |
817 | ||
818 | default: | |
819 | scm_wrong_type_arg (FUNC_NAME, 1, m); | |
820 | return SCM_BOOL_F; | |
821 | } | |
822 | } | |
823 | #undef FUNC_NAME | |
824 | ||
b7742c6b AW |
825 | |
826 | \f | |
827 | ||
828 | void | |
829 | scm_init_memoize () | |
830 | { | |
831 | scm_tc16_memoized = scm_make_smob_type ("%memoized", 0); | |
832 | scm_set_smob_mark (scm_tc16_memoized, scm_markcdr); | |
833 | scm_set_smob_print (scm_tc16_memoized, scm_print_memoized); | |
834 | ||
2cd72a84 AW |
835 | scm_tc16_memoizer = scm_make_smob_type ("memoizer", 0); |
836 | ||
b7742c6b | 837 | #include "libguile/memoize.x" |
4f692ace | 838 | |
dc3e203e | 839 | list_of_guile = scm_list_1 (scm_from_locale_symbol ("guile")); |
b7742c6b AW |
840 | } |
841 | ||
842 | /* | |
843 | Local Variables: | |
844 | c-file-style: "gnu" | |
845 | End: | |
846 | */ |