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4a655e50 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2011 |
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 | ||
b2b33168 AW |
67 | #define MAKMEMO(n, args) \ |
68 | (scm_cell (scm_tc16_memoized | ((n) << 16), SCM_UNPACK (args))) | |
b7742c6b AW |
69 | |
70 | #define MAKMEMO_BEGIN(exps) \ | |
71 | MAKMEMO (SCM_M_BEGIN, exps) | |
72 | #define MAKMEMO_IF(test, then, else_) \ | |
73 | MAKMEMO (SCM_M_IF, scm_cons (test, scm_cons (then, else_))) | |
8f9c5b58 AW |
74 | #define FIXED_ARITY(nreq) \ |
75 | scm_list_1 (SCM_I_MAKINUM (nreq)) | |
76 | #define REST_ARITY(nreq, rest) \ | |
77 | scm_list_2 (SCM_I_MAKINUM (nreq), rest) | |
9658182d AW |
78 | #define FULL_ARITY(nreq, rest, nopt, kw, inits, alt) \ |
79 | scm_list_n (SCM_I_MAKINUM (nreq), rest, SCM_I_MAKINUM (nopt), kw, inits, \ | |
80 | alt, SCM_UNDEFINED) | |
8f9c5b58 AW |
81 | #define MAKMEMO_LAMBDA(body, arity) \ |
82 | MAKMEMO (SCM_M_LAMBDA, (scm_cons (body, arity))) | |
b7742c6b AW |
83 | #define MAKMEMO_LET(inits, body) \ |
84 | MAKMEMO (SCM_M_LET, scm_cons (inits, body)) | |
85 | #define MAKMEMO_QUOTE(exp) \ | |
86 | MAKMEMO (SCM_M_QUOTE, exp) | |
87 | #define MAKMEMO_DEFINE(var, val) \ | |
88 | MAKMEMO (SCM_M_DEFINE, scm_cons (var, val)) | |
d69531e2 AW |
89 | #define MAKMEMO_DYNWIND(in, expr, out) \ |
90 | MAKMEMO (SCM_M_DYNWIND, scm_cons (in, scm_cons (expr, out))) | |
bb0229b5 AW |
91 | #define MAKMEMO_WITH_FLUIDS(fluids, vals, expr) \ |
92 | MAKMEMO (SCM_M_WITH_FLUIDS, scm_cons (fluids, scm_cons (vals, expr))) | |
2cd72a84 AW |
93 | #define MAKMEMO_APPLY(proc, args)\ |
94 | MAKMEMO (SCM_M_APPLY, scm_list_2 (proc, args)) | |
b7742c6b AW |
95 | #define MAKMEMO_CONT(proc) \ |
96 | MAKMEMO (SCM_M_CONT, proc) | |
97 | #define MAKMEMO_CALL_WITH_VALUES(prod, cons) \ | |
98 | MAKMEMO (SCM_M_CALL_WITH_VALUES, scm_cons (prod, cons)) | |
9331f91c AW |
99 | #define MAKMEMO_CALL(proc, nargs, args) \ |
100 | MAKMEMO (SCM_M_CALL, scm_cons (proc, scm_cons (SCM_I_MAKINUM (nargs), args))) | |
b7742c6b AW |
101 | #define MAKMEMO_LEX_REF(n) \ |
102 | MAKMEMO (SCM_M_LEXICAL_REF, SCM_I_MAKINUM (n)) | |
103 | #define MAKMEMO_LEX_SET(n, val) \ | |
104 | MAKMEMO (SCM_M_LEXICAL_SET, scm_cons (SCM_I_MAKINUM (n), val)) | |
105 | #define MAKMEMO_TOP_REF(var) \ | |
106 | MAKMEMO (SCM_M_TOPLEVEL_REF, var) | |
107 | #define MAKMEMO_TOP_SET(var, val) \ | |
108 | MAKMEMO (SCM_M_TOPLEVEL_SET, scm_cons (var, val)) | |
109 | #define MAKMEMO_MOD_REF(mod, var, public) \ | |
110 | MAKMEMO (SCM_M_MODULE_REF, scm_cons (mod, scm_cons (var, public))) | |
111 | #define MAKMEMO_MOD_SET(val, mod, var, public) \ | |
112 | MAKMEMO (SCM_M_MODULE_SET, scm_cons (val, scm_cons (mod, scm_cons (var, public)))) | |
747022e4 AW |
113 | #define MAKMEMO_PROMPT(tag, exp, handler) \ |
114 | MAKMEMO (SCM_M_PROMPT, scm_cons (tag, scm_cons (exp, handler))) | |
b7742c6b | 115 | |
2cd72a84 AW |
116 | |
117 | /* Primitives for the evaluator */ | |
118 | scm_t_bits scm_tc16_memoizer; | |
119 | #define SCM_MEMOIZER_P(x) (SCM_SMOB_PREDICATE (scm_tc16_memoizer, (x))) | |
120 | #define SCM_MEMOIZER(M) (SCM_SMOB_OBJECT_1 (M)) | |
121 | ||
b7742c6b AW |
122 | \f |
123 | ||
124 | /* This table must agree with the list of M_ constants in memoize.h */ | |
125 | static const char *const memoized_tags[] = | |
126 | { | |
127 | "begin", | |
128 | "if", | |
129 | "lambda", | |
130 | "let", | |
131 | "quote", | |
132 | "define", | |
d69531e2 | 133 | "dynwind", |
bb0229b5 | 134 | "with-fluids", |
b7742c6b | 135 | "apply", |
3149a5b6 | 136 | "call/cc", |
b7742c6b AW |
137 | "call-with-values", |
138 | "call", | |
139 | "lexical-ref", | |
140 | "lexical-set!", | |
141 | "toplevel-ref", | |
142 | "toplevel-set!", | |
143 | "module-ref", | |
3149a5b6 | 144 | "module-set!", |
747022e4 | 145 | "prompt", |
b7742c6b AW |
146 | }; |
147 | ||
148 | static int | |
149 | scm_print_memoized (SCM memoized, SCM port, scm_print_state *pstate) | |
150 | { | |
151 | scm_puts ("#<memoized ", port); | |
152 | scm_write (scm_unmemoize_expression (memoized), port); | |
153 | scm_puts (">", port); | |
154 | return 1; | |
155 | } | |
156 | ||
b7742c6b | 157 | |
b7742c6b AW |
158 | \f |
159 | ||
160 | ||
b7742c6b | 161 | static int |
dc3e203e | 162 | lookup (SCM x, SCM env) |
b7742c6b AW |
163 | { |
164 | int i = 0; | |
165 | for (; scm_is_pair (env); env = CDR (env), i++) | |
166 | if (scm_is_eq (x, CAR (env))) | |
167 | return i; /* bound */ | |
dc3e203e | 168 | abort (); |
b7742c6b AW |
169 | } |
170 | ||
b7742c6b | 171 | |
dc3e203e AW |
172 | /* Abbreviate SCM_EXPANDED_REF. Copied because I'm not sure about symbol pasting */ |
173 | #define REF(x,type,field) \ | |
174 | (scm_struct_ref (x, SCM_I_MAKINUM (SCM_EXPANDED_##type##_##field))) | |
b7742c6b | 175 | |
dc3e203e | 176 | static SCM list_of_guile = SCM_BOOL_F; |
b7742c6b | 177 | |
dc3e203e | 178 | static SCM memoize (SCM exp, SCM env); |
b7742c6b AW |
179 | |
180 | static SCM | |
dc3e203e | 181 | memoize_exps (SCM exps, SCM env) |
b7742c6b | 182 | { |
dc3e203e AW |
183 | SCM ret; |
184 | for (ret = SCM_EOL; scm_is_pair (exps); exps = CDR (exps)) | |
185 | ret = scm_cons (memoize (CAR (exps), env), ret); | |
186 | return scm_reverse_x (ret, SCM_UNDEFINED); | |
7572ee52 | 187 | } |
7572ee52 | 188 | |
7572ee52 | 189 | static SCM |
dc3e203e | 190 | memoize (SCM exp, SCM env) |
b7742c6b | 191 | { |
dc3e203e AW |
192 | if (!SCM_EXPANDED_P (exp)) |
193 | abort (); | |
b7742c6b | 194 | |
dc3e203e | 195 | switch (SCM_EXPANDED_TYPE (exp)) |
b7742c6b | 196 | { |
dc3e203e AW |
197 | case SCM_EXPANDED_VOID: |
198 | return MAKMEMO_QUOTE (SCM_UNSPECIFIED); | |
199 | ||
200 | case SCM_EXPANDED_CONST: | |
201 | return MAKMEMO_QUOTE (REF (exp, CONST, EXP)); | |
b7742c6b | 202 | |
dc3e203e AW |
203 | case SCM_EXPANDED_PRIMITIVE_REF: |
204 | if (scm_is_eq (scm_current_module (), scm_the_root_module ())) | |
205 | return MAKMEMO_TOP_REF (REF (exp, PRIMITIVE_REF, NAME)); | |
206 | else | |
207 | return MAKMEMO_MOD_REF (list_of_guile, REF (exp, PRIMITIVE_REF, NAME), | |
208 | SCM_BOOL_F); | |
209 | ||
210 | case SCM_EXPANDED_LEXICAL_REF: | |
211 | return MAKMEMO_LEX_REF (lookup (REF (exp, LEXICAL_REF, GENSYM), env)); | |
212 | ||
213 | case SCM_EXPANDED_LEXICAL_SET: | |
214 | return MAKMEMO_LEX_SET (lookup (REF (exp, LEXICAL_SET, GENSYM), env), | |
215 | memoize (REF (exp, LEXICAL_SET, EXP), env)); | |
216 | ||
217 | case SCM_EXPANDED_MODULE_REF: | |
218 | return MAKMEMO_MOD_REF (REF (exp, MODULE_REF, MOD), | |
219 | REF (exp, MODULE_REF, NAME), | |
220 | REF (exp, MODULE_REF, PUBLIC)); | |
221 | ||
222 | case SCM_EXPANDED_MODULE_SET: | |
223 | return MAKMEMO_MOD_SET (memoize (REF (exp, MODULE_SET, EXP), env), | |
224 | REF (exp, MODULE_SET, MOD), | |
225 | REF (exp, MODULE_SET, NAME), | |
226 | REF (exp, MODULE_SET, PUBLIC)); | |
227 | ||
228 | case SCM_EXPANDED_TOPLEVEL_REF: | |
229 | return MAKMEMO_TOP_REF (REF (exp, TOPLEVEL_REF, NAME)); | |
230 | ||
231 | case SCM_EXPANDED_TOPLEVEL_SET: | |
232 | return MAKMEMO_TOP_SET (REF (exp, TOPLEVEL_SET, NAME), | |
233 | memoize (REF (exp, TOPLEVEL_SET, EXP), env)); | |
234 | ||
235 | case SCM_EXPANDED_TOPLEVEL_DEFINE: | |
236 | return MAKMEMO_DEFINE (REF (exp, TOPLEVEL_DEFINE, NAME), | |
237 | memoize (REF (exp, TOPLEVEL_DEFINE, EXP), env)); | |
238 | ||
239 | case SCM_EXPANDED_CONDITIONAL: | |
240 | return MAKMEMO_IF (memoize (REF (exp, CONDITIONAL, TEST), env), | |
241 | memoize (REF (exp, CONDITIONAL, CONSEQUENT), env), | |
242 | memoize (REF (exp, CONDITIONAL, ALTERNATE), env)); | |
243 | ||
7081d4f9 | 244 | case SCM_EXPANDED_CALL: |
dc3e203e AW |
245 | { |
246 | SCM proc, args; | |
b7742c6b | 247 | |
7081d4f9 AW |
248 | proc = REF (exp, CALL, PROC); |
249 | args = memoize_exps (REF (exp, CALL, ARGS), env); | |
b7742c6b | 250 | |
dc3e203e AW |
251 | if (SCM_EXPANDED_TYPE (proc) == SCM_EXPANDED_TOPLEVEL_REF) |
252 | { | |
253 | SCM var = scm_module_variable (scm_current_module (), | |
254 | REF (proc, TOPLEVEL_REF, NAME)); | |
255 | if (SCM_VARIABLEP (var)) | |
256 | { | |
257 | SCM val = SCM_VARIABLE_REF (var); | |
258 | if (SCM_MEMOIZER_P (val)) | |
259 | return scm_apply (SCM_SMOB_OBJECT_1 (val), args, SCM_EOL); | |
260 | } | |
261 | } | |
262 | /* otherwise we all fall down here */ | |
263 | return MAKMEMO_CALL (memoize (proc, env), scm_ilength (args), args); | |
264 | } | |
b7742c6b | 265 | |
dc3e203e AW |
266 | case SCM_EXPANDED_SEQUENCE: |
267 | return MAKMEMO_BEGIN (memoize_exps (REF (exp, SEQUENCE, EXPS), env)); | |
b7742c6b | 268 | |
dc3e203e AW |
269 | case SCM_EXPANDED_LAMBDA: |
270 | /* The body will be a lambda-case. */ | |
271 | return memoize (REF (exp, LAMBDA, BODY), env); | |
b7742c6b | 272 | |
dc3e203e AW |
273 | case SCM_EXPANDED_LAMBDA_CASE: |
274 | { | |
275 | SCM req, rest, opt, kw, inits, vars, body, alt; | |
276 | SCM walk, minits, arity, new_env; | |
632ddbf0 | 277 | int nreq, nopt, ntotal; |
dc3e203e AW |
278 | |
279 | req = REF (exp, LAMBDA_CASE, REQ); | |
280 | rest = REF (exp, LAMBDA_CASE, REST); | |
281 | opt = REF (exp, LAMBDA_CASE, OPT); | |
282 | kw = REF (exp, LAMBDA_CASE, KW); | |
283 | inits = REF (exp, LAMBDA_CASE, INITS); | |
284 | vars = REF (exp, LAMBDA_CASE, GENSYMS); | |
285 | body = REF (exp, LAMBDA_CASE, BODY); | |
286 | alt = REF (exp, LAMBDA_CASE, ALTERNATE); | |
287 | ||
288 | nreq = scm_ilength (req); | |
289 | nopt = scm_is_pair (opt) ? scm_ilength (opt) : 0; | |
632ddbf0 | 290 | ntotal = scm_ilength (vars); |
dc3e203e AW |
291 | |
292 | /* The vars are the gensyms, according to the divine plan. But we need | |
293 | to memoize the inits within their appropriate environment, | |
294 | complicating things. */ | |
295 | new_env = env; | |
296 | for (walk = req; scm_is_pair (walk); | |
297 | walk = CDR (walk), vars = CDR (vars)) | |
298 | new_env = scm_cons (CAR (vars), new_env); | |
299 | ||
300 | minits = SCM_EOL; | |
301 | for (walk = opt; scm_is_pair (walk); | |
302 | walk = CDR (walk), vars = CDR (vars), inits = CDR (inits)) | |
303 | { | |
304 | minits = scm_cons (memoize (CAR (inits), new_env), minits); | |
305 | new_env = scm_cons (CAR (vars), new_env); | |
306 | } | |
b7742c6b | 307 | |
dc3e203e AW |
308 | if (scm_is_true (rest)) |
309 | { | |
310 | new_env = scm_cons (CAR (vars), new_env); | |
311 | vars = CDR (vars); | |
312 | } | |
b7742c6b | 313 | |
dc3e203e AW |
314 | for (; scm_is_pair (inits); vars = CDR (vars), inits = CDR (inits)) |
315 | { | |
316 | minits = scm_cons (memoize (CAR (inits), new_env), minits); | |
317 | new_env = scm_cons (CAR (vars), new_env); | |
318 | } | |
319 | if (!scm_is_null (vars)) | |
320 | abort (); | |
b7742c6b | 321 | |
dc3e203e | 322 | minits = scm_reverse_x (minits, SCM_UNDEFINED); |
b7742c6b | 323 | |
632ddbf0 AW |
324 | if (scm_is_true (kw)) |
325 | { | |
326 | /* (aok? (kw name sym) ...) -> (aok? (kw . index) ...) */ | |
327 | SCM aok = CAR (kw), indices = SCM_EOL; | |
328 | for (kw = CDR (kw); scm_is_pair (kw); kw = CDR (kw)) | |
329 | { | |
330 | SCM k; | |
331 | int idx; | |
332 | ||
333 | k = CAR (CAR (kw)); | |
334 | idx = ntotal - 1 - lookup (CADDR (CAR (kw)), new_env); | |
335 | indices = scm_acons (k, SCM_I_MAKINUM (idx), indices); | |
336 | } | |
337 | kw = scm_cons (aok, scm_reverse_x (indices, SCM_UNDEFINED)); | |
338 | } | |
339 | ||
dc3e203e AW |
340 | if (scm_is_false (alt) && scm_is_false (kw) && scm_is_false (opt)) |
341 | { | |
342 | if (scm_is_false (rest)) | |
343 | arity = FIXED_ARITY (nreq); | |
344 | else | |
345 | arity = REST_ARITY (nreq, SCM_BOOL_T); | |
346 | } | |
347 | else if (scm_is_true (alt)) | |
348 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, | |
349 | SCM_MEMOIZED_ARGS (memoize (alt, env))); | |
350 | else | |
351 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, SCM_BOOL_F); | |
b7742c6b | 352 | |
dc3e203e AW |
353 | return MAKMEMO_LAMBDA (memoize (body, new_env), arity); |
354 | } | |
b7742c6b | 355 | |
dc3e203e AW |
356 | case SCM_EXPANDED_LET: |
357 | { | |
358 | SCM vars, exps, body, inits, new_env; | |
359 | ||
360 | vars = REF (exp, LET, GENSYMS); | |
361 | exps = REF (exp, LET, VALS); | |
362 | body = REF (exp, LET, BODY); | |
363 | ||
364 | inits = SCM_EOL; | |
365 | new_env = env; | |
366 | for (; scm_is_pair (vars); vars = CDR (vars), exps = CDR (exps)) | |
367 | { | |
368 | new_env = scm_cons (CAR (vars), new_env); | |
369 | inits = scm_cons (memoize (CAR (exps), env), inits); | |
370 | } | |
b7742c6b | 371 | |
dc3e203e AW |
372 | return MAKMEMO_LET (scm_reverse_x (inits, SCM_UNDEFINED), |
373 | memoize (body, new_env)); | |
374 | } | |
b7742c6b | 375 | |
dc3e203e AW |
376 | case SCM_EXPANDED_LETREC: |
377 | { | |
826373a2 AW |
378 | SCM vars, exps, body, undefs, new_env; |
379 | int i, nvars, in_order_p; | |
dc3e203e | 380 | |
f238862e AW |
381 | vars = REF (exp, LETREC, GENSYMS); |
382 | exps = REF (exp, LETREC, VALS); | |
383 | body = REF (exp, LETREC, BODY); | |
826373a2 | 384 | in_order_p = scm_is_true (REF (exp, LETREC, IN_ORDER_P)); |
dc3e203e | 385 | nvars = i = scm_ilength (vars); |
826373a2 | 386 | undefs = SCM_EOL; |
dc3e203e AW |
387 | new_env = env; |
388 | ||
826373a2 | 389 | for (; scm_is_pair (vars); vars = CDR (vars)) |
dc3e203e AW |
390 | { |
391 | new_env = scm_cons (CAR (vars), new_env); | |
392 | undefs = scm_cons (MAKMEMO_QUOTE (SCM_UNDEFINED), undefs); | |
dc3e203e | 393 | } |
b7742c6b | 394 | |
826373a2 AW |
395 | if (in_order_p) |
396 | { | |
397 | SCM body_exps = SCM_EOL; | |
398 | for (; scm_is_pair (exps); exps = CDR (exps), i--) | |
399 | body_exps = scm_cons (MAKMEMO_LEX_SET (i-1, | |
400 | memoize (CAR (exps), new_env)), | |
401 | body_exps); | |
402 | body_exps = scm_cons (memoize (body, new_env), body_exps); | |
403 | body_exps = scm_reverse_x (body_exps, SCM_UNDEFINED); | |
404 | return MAKMEMO_LET (undefs, MAKMEMO_BEGIN (body_exps)); | |
405 | } | |
406 | else | |
407 | { | |
408 | SCM sets = SCM_EOL, inits = SCM_EOL; | |
409 | for (; scm_is_pair (exps); exps = CDR (exps), i--) | |
410 | { | |
411 | sets = scm_cons (MAKMEMO_LEX_SET ((i-1) + nvars, | |
412 | MAKMEMO_LEX_REF (i-1)), | |
413 | sets); | |
414 | inits = scm_cons (memoize (CAR (exps), new_env), inits); | |
415 | } | |
416 | inits = scm_reverse_x (inits, SCM_UNDEFINED); | |
417 | return MAKMEMO_LET | |
418 | (undefs, | |
419 | MAKMEMO_BEGIN (scm_list_2 (MAKMEMO_LET (inits, MAKMEMO_BEGIN (sets)), | |
420 | memoize (body, new_env)))); | |
421 | } | |
dc3e203e | 422 | } |
b7742c6b | 423 | |
dc3e203e AW |
424 | case SCM_EXPANDED_DYNLET: |
425 | return MAKMEMO_WITH_FLUIDS (memoize_exps (REF (exp, DYNLET, FLUIDS), env), | |
426 | memoize_exps (REF (exp, DYNLET, VALS), env), | |
427 | memoize (REF (exp, DYNLET, BODY), env)); | |
b7742c6b | 428 | |
b7742c6b | 429 | default: |
dc3e203e | 430 | abort (); |
b7742c6b AW |
431 | } |
432 | } | |
433 | ||
434 | ||
435 | \f | |
436 | ||
437 | SCM_DEFINE (scm_memoize_expression, "memoize-expression", 1, 0, 0, | |
438 | (SCM exp), | |
439 | "Memoize the expression @var{exp}.") | |
440 | #define FUNC_NAME s_scm_memoize_expression | |
441 | { | |
a310a1d1 | 442 | SCM_ASSERT_TYPE (SCM_EXPANDED_P (exp), exp, 1, FUNC_NAME, "expanded"); |
b7742c6b AW |
443 | return memoize (exp, scm_current_module ()); |
444 | } | |
445 | #undef FUNC_NAME | |
446 | ||
2cd72a84 | 447 | |
b7742c6b AW |
448 | \f |
449 | ||
2cd72a84 AW |
450 | #define SCM_MAKE_MEMOIZER(STR, MEMOIZER, N) \ |
451 | (scm_cell (scm_tc16_memoizer, \ | |
b2b33168 | 452 | SCM_UNPACK (scm_c_make_gsubr (STR, N, 0, 0, MEMOIZER)))) |
2cd72a84 AW |
453 | #define SCM_DEFINE_MEMOIZER(STR, MEMOIZER, N) \ |
454 | SCM_SNARF_INIT(scm_c_define (STR, SCM_MAKE_MEMOIZER (STR, MEMOIZER, N))) | |
455 | ||
efa360af AW |
456 | #define SCM_MAKE_REST_MEMOIZER(STR, MEMOIZER, N) \ |
457 | (scm_cell (scm_tc16_memoizer, \ | |
b2b33168 | 458 | SCM_UNPACK ((scm_c_make_gsubr (STR, N, 0, 1, MEMOIZER))))) |
efa360af AW |
459 | #define SCM_DEFINE_REST_MEMOIZER(STR, MEMOIZER, N) \ |
460 | SCM_SNARF_INIT(scm_c_define (STR, SCM_MAKE_REST_MEMOIZER (STR, MEMOIZER, N))) | |
461 | ||
462 | static SCM m_apply (SCM proc, SCM arg, SCM rest); | |
2cd72a84 AW |
463 | static SCM m_call_cc (SCM proc); |
464 | static SCM m_call_values (SCM prod, SCM cons); | |
465 | static SCM m_dynamic_wind (SCM pre, SCM exp, SCM post); | |
466 | static SCM m_prompt (SCM tag, SCM exp, SCM handler); | |
467 | ||
efa360af | 468 | SCM_DEFINE_REST_MEMOIZER ("@apply", m_apply, 2); |
2cd72a84 AW |
469 | SCM_DEFINE_MEMOIZER ("@call-with-current-continuation", m_call_cc, 1); |
470 | SCM_DEFINE_MEMOIZER ("@call-with-values", m_call_values, 2); | |
471 | SCM_DEFINE_MEMOIZER ("@dynamic-wind", m_dynamic_wind, 3); | |
472 | SCM_DEFINE_MEMOIZER ("@prompt", m_prompt, 3); | |
473 | ||
474 | ||
475 | \f | |
476 | ||
efa360af | 477 | static SCM m_apply (SCM proc, SCM arg, SCM rest) |
2cd72a84 AW |
478 | #define FUNC_NAME "@apply" |
479 | { | |
efa360af AW |
480 | long len; |
481 | ||
2cd72a84 | 482 | SCM_VALIDATE_MEMOIZED (1, proc); |
efa360af AW |
483 | SCM_VALIDATE_MEMOIZED (2, arg); |
484 | len = scm_ilength (rest); | |
485 | if (len < 0) | |
486 | abort (); | |
487 | else if (len == 0) | |
488 | return MAKMEMO_APPLY (proc, arg); | |
489 | else | |
490 | { | |
491 | SCM tail; | |
492 | ||
493 | rest = scm_reverse (rest); | |
494 | tail = scm_car (rest); | |
495 | rest = scm_cdr (rest); | |
496 | len--; | |
497 | ||
498 | while (scm_is_pair (rest)) | |
499 | { | |
4a655e50 AW |
500 | tail = MAKMEMO_CALL (MAKMEMO_MOD_REF (scm_list_1 (scm_from_latin1_symbol ("guile")), |
501 | scm_from_latin1_symbol ("cons"), | |
efa360af AW |
502 | SCM_BOOL_F), |
503 | 2, | |
504 | scm_list_2 (scm_car (rest), tail)); | |
505 | rest = scm_cdr (rest); | |
506 | } | |
507 | return MAKMEMO_APPLY (proc, tail); | |
508 | } | |
2cd72a84 AW |
509 | } |
510 | #undef FUNC_NAME | |
511 | ||
512 | static SCM m_call_cc (SCM proc) | |
513 | #define FUNC_NAME "@call-with-current-continuation" | |
514 | { | |
515 | SCM_VALIDATE_MEMOIZED (1, proc); | |
516 | return MAKMEMO_CONT (proc); | |
517 | } | |
518 | #undef FUNC_NAME | |
519 | ||
520 | static SCM m_call_values (SCM prod, SCM cons) | |
521 | #define FUNC_NAME "@call-with-values" | |
522 | { | |
523 | SCM_VALIDATE_MEMOIZED (1, prod); | |
524 | SCM_VALIDATE_MEMOIZED (2, cons); | |
525 | return MAKMEMO_CALL_WITH_VALUES (prod, cons); | |
526 | } | |
527 | #undef FUNC_NAME | |
528 | ||
529 | static SCM m_dynamic_wind (SCM in, SCM expr, SCM out) | |
530 | #define FUNC_NAME "memoize-dynwind" | |
531 | { | |
532 | SCM_VALIDATE_MEMOIZED (1, in); | |
533 | SCM_VALIDATE_MEMOIZED (2, expr); | |
534 | SCM_VALIDATE_MEMOIZED (3, out); | |
535 | return MAKMEMO_DYNWIND (in, expr, out); | |
536 | } | |
537 | #undef FUNC_NAME | |
538 | ||
539 | static SCM m_prompt (SCM tag, SCM exp, SCM handler) | |
540 | #define FUNC_NAME "@prompt" | |
541 | { | |
542 | SCM_VALIDATE_MEMOIZED (1, tag); | |
543 | SCM_VALIDATE_MEMOIZED (2, exp); | |
544 | SCM_VALIDATE_MEMOIZED (3, handler); | |
545 | return MAKMEMO_PROMPT (tag, exp, handler); | |
546 | } | |
547 | #undef FUNC_NAME | |
548 | ||
2cd72a84 AW |
549 | |
550 | \f | |
b7742c6b AW |
551 | |
552 | SCM_SYMBOL (sym_placeholder, "_"); | |
553 | ||
554 | static SCM unmemoize (SCM expr); | |
555 | ||
556 | static SCM | |
557 | unmemoize_exprs (SCM exprs) | |
558 | { | |
559 | SCM ret, tail; | |
560 | if (scm_is_null (exprs)) | |
561 | return SCM_EOL; | |
562 | ret = scm_list_1 (unmemoize (CAR (exprs))); | |
563 | tail = ret; | |
564 | for (exprs = CDR (exprs); !scm_is_null (exprs); exprs = CDR (exprs)) | |
565 | { | |
566 | SCM_SETCDR (tail, scm_list_1 (unmemoize (CAR (exprs)))); | |
567 | tail = CDR (tail); | |
568 | } | |
569 | return ret; | |
570 | } | |
571 | ||
572 | static SCM | |
573 | unmemoize_bindings (SCM inits) | |
574 | { | |
575 | SCM ret, tail; | |
576 | if (scm_is_null (inits)) | |
577 | return SCM_EOL; | |
578 | ret = scm_list_1 (scm_list_2 (sym_placeholder, unmemoize (CAR (inits)))); | |
579 | tail = ret; | |
580 | for (inits = CDR (inits); !scm_is_null (inits); inits = CDR (inits)) | |
581 | { | |
582 | SCM_SETCDR (tail, scm_list_1 (scm_list_2 (sym_placeholder, | |
583 | unmemoize (CAR (inits))))); | |
584 | tail = CDR (tail); | |
585 | } | |
586 | return ret; | |
587 | } | |
588 | ||
589 | static SCM | |
590 | unmemoize_lexical (SCM n) | |
591 | { | |
592 | char buf[16]; | |
593 | buf[15] = 0; | |
594 | snprintf (buf, 15, "<%u>", scm_to_uint32 (n)); | |
595 | return scm_from_locale_symbol (buf); | |
596 | } | |
597 | ||
598 | static SCM | |
599 | unmemoize (const SCM expr) | |
600 | { | |
601 | SCM args; | |
602 | ||
603 | if (!SCM_MEMOIZED_P (expr)) | |
604 | abort (); | |
605 | ||
606 | args = SCM_MEMOIZED_ARGS (expr); | |
607 | switch (SCM_MEMOIZED_TAG (expr)) | |
608 | { | |
609 | case SCM_M_APPLY: | |
610 | return scm_cons (scm_sym_atapply, unmemoize_exprs (args)); | |
611 | case SCM_M_BEGIN: | |
612 | return scm_cons (scm_sym_begin, unmemoize_exprs (args)); | |
613 | case SCM_M_CALL: | |
9331f91c | 614 | return scm_cons (unmemoize (CAR (args)), unmemoize_exprs (CDDR (args))); |
b7742c6b AW |
615 | case SCM_M_CONT: |
616 | return scm_list_2 (scm_sym_atcall_cc, unmemoize (args)); | |
617 | case SCM_M_CALL_WITH_VALUES: | |
618 | return scm_list_3 (scm_sym_at_call_with_values, | |
619 | unmemoize (CAR (args)), unmemoize (CDR (args))); | |
620 | case SCM_M_DEFINE: | |
621 | return scm_list_3 (scm_sym_define, CAR (args), unmemoize (CDR (args))); | |
d69531e2 AW |
622 | case SCM_M_DYNWIND: |
623 | return scm_list_4 (scm_sym_at_dynamic_wind, | |
624 | unmemoize (CAR (args)), | |
625 | unmemoize (CADR (args)), | |
626 | unmemoize (CDDR (args))); | |
bb0229b5 AW |
627 | case SCM_M_WITH_FLUIDS: |
628 | { | |
629 | SCM binds = SCM_EOL, fluids, vals; | |
630 | for (fluids = CAR (args), vals = CADR (args); scm_is_pair (fluids); | |
631 | fluids = CDR (fluids), vals = CDR (vals)) | |
632 | binds = scm_cons (scm_list_2 (unmemoize (CAR (fluids)), | |
633 | unmemoize (CAR (vals))), | |
634 | binds); | |
635 | return scm_list_3 (scm_sym_with_fluids, | |
636 | scm_reverse_x (binds, SCM_UNDEFINED), | |
637 | unmemoize (CDDR (args))); | |
638 | } | |
b7742c6b AW |
639 | case SCM_M_IF: |
640 | return scm_list_4 (scm_sym_if, unmemoize (scm_car (args)), | |
641 | unmemoize (scm_cadr (args)), unmemoize (scm_cddr (args))); | |
642 | case SCM_M_LAMBDA: | |
8f9c5b58 AW |
643 | if (scm_is_null (CDDR (args))) |
644 | return scm_list_3 (scm_sym_lambda, | |
645 | scm_make_list (CADR (args), sym_placeholder), | |
646 | unmemoize (CAR (args))); | |
647 | else if (scm_is_null (CDDDR (args))) | |
648 | { | |
649 | SCM formals = scm_make_list (CADR (args), sym_placeholder); | |
650 | return scm_list_3 (scm_sym_lambda, | |
651 | scm_is_true (CADDR (args)) | |
652 | ? scm_cons_star (sym_placeholder, formals) | |
653 | : formals, | |
654 | unmemoize (CAR (args))); | |
655 | } | |
656 | else | |
9658182d | 657 | { |
7572ee52 | 658 | SCM body = CAR (args), spec = CDR (args), alt, tail; |
9658182d AW |
659 | |
660 | alt = CADDR (CDDDR (spec)); | |
661 | if (scm_is_true (alt)) | |
7572ee52 AW |
662 | tail = CDR (unmemoize (alt)); |
663 | else | |
664 | tail = SCM_EOL; | |
9658182d | 665 | |
7572ee52 AW |
666 | return scm_cons |
667 | (sym_case_lambda_star, | |
668 | scm_cons (scm_list_2 (scm_list_5 (CAR (spec), | |
669 | CADR (spec), | |
670 | CADDR (spec), | |
671 | CADDDR (spec), | |
672 | unmemoize_exprs (CADR (CDDDR (spec)))), | |
673 | unmemoize (body)), | |
674 | tail)); | |
9658182d | 675 | } |
b7742c6b AW |
676 | case SCM_M_LET: |
677 | return scm_list_3 (scm_sym_let, | |
678 | unmemoize_bindings (CAR (args)), | |
679 | unmemoize (CDR (args))); | |
680 | case SCM_M_QUOTE: | |
681 | return scm_list_2 (scm_sym_quote, args); | |
682 | case SCM_M_LEXICAL_REF: | |
683 | return unmemoize_lexical (args); | |
684 | case SCM_M_LEXICAL_SET: | |
685 | return scm_list_3 (scm_sym_set_x, unmemoize_lexical (CAR (args)), | |
686 | unmemoize (CDR (args))); | |
687 | case SCM_M_TOPLEVEL_REF: | |
688 | return args; | |
689 | case SCM_M_TOPLEVEL_SET: | |
690 | return scm_list_3 (scm_sym_set_x, CAR (args), unmemoize (CDR (args))); | |
691 | case SCM_M_MODULE_REF: | |
c08899ff AW |
692 | return SCM_VARIABLEP (args) ? args |
693 | : scm_list_3 (scm_is_true (CDDR (args)) ? scm_sym_at : scm_sym_atat, | |
694 | scm_i_finite_list_copy (CAR (args)), | |
695 | CADR (args)); | |
b7742c6b AW |
696 | case SCM_M_MODULE_SET: |
697 | return scm_list_3 (scm_sym_set_x, | |
c08899ff AW |
698 | SCM_VARIABLEP (CDR (args)) ? CDR (args) |
699 | : scm_list_3 (scm_is_true (CDDDR (args)) | |
700 | ? scm_sym_at : scm_sym_atat, | |
701 | scm_i_finite_list_copy (CADR (args)), | |
702 | CADDR (args)), | |
b7742c6b | 703 | unmemoize (CAR (args))); |
747022e4 AW |
704 | case SCM_M_PROMPT: |
705 | return scm_list_4 (scm_sym_at_prompt, | |
706 | unmemoize (CAR (args)), | |
707 | unmemoize (CADR (args)), | |
708 | unmemoize (CDDR (args))); | |
b7742c6b AW |
709 | default: |
710 | abort (); | |
711 | } | |
712 | } | |
713 | ||
2cd72a84 AW |
714 | |
715 | \f | |
716 | ||
b7742c6b AW |
717 | SCM_DEFINE (scm_memoized_p, "memoized?", 1, 0, 0, |
718 | (SCM obj), | |
719 | "Return @code{#t} if @var{obj} is memoized.") | |
720 | #define FUNC_NAME s_scm_memoized_p | |
721 | { | |
722 | return scm_from_bool (SCM_MEMOIZED_P (obj)); | |
723 | } | |
724 | #undef FUNC_NAME | |
725 | ||
726 | SCM_DEFINE (scm_unmemoize_expression, "unmemoize-expression", 1, 0, 0, | |
727 | (SCM m), | |
728 | "Unmemoize the memoized expression @var{m}.") | |
729 | #define FUNC_NAME s_scm_unmemoize_expression | |
730 | { | |
731 | SCM_VALIDATE_MEMOIZED (1, m); | |
732 | return unmemoize (m); | |
733 | } | |
734 | #undef FUNC_NAME | |
735 | ||
3149a5b6 AW |
736 | SCM_DEFINE (scm_memoized_expression_typecode, "memoized-expression-typecode", 1, 0, 0, |
737 | (SCM m), | |
738 | "Return the typecode from the memoized expression @var{m}.") | |
739 | #define FUNC_NAME s_scm_memoized_expression_typecode | |
740 | { | |
741 | SCM_VALIDATE_MEMOIZED (1, m); | |
b7ecadca LC |
742 | |
743 | /* The tag is a 16-bit integer so it fits in an inum. */ | |
744 | return SCM_I_MAKINUM (SCM_MEMOIZED_TAG (m)); | |
3149a5b6 AW |
745 | } |
746 | #undef FUNC_NAME | |
747 | ||
748 | SCM_DEFINE (scm_memoized_expression_data, "memoized-expression-data", 1, 0, 0, | |
749 | (SCM m), | |
750 | "Return the data from the memoized expression @var{m}.") | |
751 | #define FUNC_NAME s_scm_memoized_expression_data | |
752 | { | |
753 | SCM_VALIDATE_MEMOIZED (1, m); | |
754 | return SCM_MEMOIZED_ARGS (m); | |
755 | } | |
756 | #undef FUNC_NAME | |
757 | ||
758 | SCM_DEFINE (scm_memoized_typecode, "memoized-typecode", 1, 0, 0, | |
759 | (SCM sym), | |
760 | "Return the memoized typecode corresponding to the symbol @var{sym}.") | |
761 | #define FUNC_NAME s_scm_memoized_typecode | |
762 | { | |
763 | int i; | |
764 | ||
765 | SCM_VALIDATE_SYMBOL (1, sym); | |
766 | ||
767 | for (i = 0; i < sizeof(memoized_tags)/sizeof(const char*); i++) | |
768 | if (strcmp (scm_i_symbol_chars (sym), memoized_tags[i]) == 0) | |
769 | return scm_from_int32 (i); | |
770 | ||
771 | return SCM_BOOL_F; | |
772 | } | |
773 | #undef FUNC_NAME | |
774 | ||
775 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
776 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
777 | static void error_unbound_variable (SCM symbol) | |
778 | { | |
779 | scm_error (scm_unbound_variable_key, NULL, "Unbound variable: ~S", | |
780 | scm_list_1 (symbol), SCM_BOOL_F); | |
781 | } | |
782 | ||
783 | SCM_DEFINE (scm_memoize_variable_access_x, "memoize-variable-access!", 2, 0, 0, | |
784 | (SCM m, SCM mod), | |
785 | "Look up and cache the variable that @var{m} will access, returning the variable.") | |
7230aaf9 | 786 | #define FUNC_NAME s_scm_memoize_variable_access_x |
3149a5b6 AW |
787 | { |
788 | SCM mx; | |
789 | SCM_VALIDATE_MEMOIZED (1, m); | |
790 | mx = SCM_MEMOIZED_ARGS (m); | |
791 | switch (SCM_MEMOIZED_TAG (m)) | |
792 | { | |
793 | case SCM_M_TOPLEVEL_REF: | |
794 | if (SCM_VARIABLEP (mx)) | |
795 | return mx; | |
796 | else | |
797 | { | |
798 | SCM var = scm_module_variable (mod, mx); | |
799 | if (scm_is_false (var) || scm_is_false (scm_variable_bound_p (var))) | |
800 | error_unbound_variable (mx); | |
801 | SCM_SET_SMOB_OBJECT (m, var); | |
802 | return var; | |
803 | } | |
804 | ||
805 | case SCM_M_TOPLEVEL_SET: | |
806 | { | |
807 | SCM var = CAR (mx); | |
808 | if (SCM_VARIABLEP (var)) | |
809 | return var; | |
810 | else | |
811 | { | |
812 | var = scm_module_variable (mod, var); | |
813 | if (scm_is_false (var)) | |
814 | error_unbound_variable (CAR (mx)); | |
815 | SCM_SETCAR (mx, var); | |
816 | return var; | |
817 | } | |
818 | } | |
819 | ||
820 | case SCM_M_MODULE_REF: | |
821 | if (SCM_VARIABLEP (mx)) | |
822 | return mx; | |
823 | else | |
824 | { | |
825 | SCM var; | |
826 | mod = scm_resolve_module (CAR (mx)); | |
827 | if (scm_is_true (CDDR (mx))) | |
828 | mod = scm_module_public_interface (mod); | |
829 | var = scm_module_lookup (mod, CADR (mx)); | |
830 | if (scm_is_false (scm_variable_bound_p (var))) | |
831 | error_unbound_variable (CADR (mx)); | |
832 | SCM_SET_SMOB_OBJECT (m, var); | |
833 | return var; | |
834 | } | |
835 | ||
836 | case SCM_M_MODULE_SET: | |
837 | /* FIXME: not quite threadsafe */ | |
838 | if (SCM_VARIABLEP (CDR (mx))) | |
839 | return CDR (mx); | |
840 | else | |
841 | { | |
842 | SCM var; | |
843 | mod = scm_resolve_module (CADR (mx)); | |
844 | if (scm_is_true (CDDDR (mx))) | |
845 | mod = scm_module_public_interface (mod); | |
846 | var = scm_module_lookup (mod, CADDR (mx)); | |
847 | SCM_SETCDR (mx, var); | |
848 | return var; | |
849 | } | |
850 | ||
851 | default: | |
852 | scm_wrong_type_arg (FUNC_NAME, 1, m); | |
853 | return SCM_BOOL_F; | |
854 | } | |
855 | } | |
856 | #undef FUNC_NAME | |
857 | ||
b7742c6b AW |
858 | |
859 | \f | |
860 | ||
861 | void | |
862 | scm_init_memoize () | |
863 | { | |
864 | scm_tc16_memoized = scm_make_smob_type ("%memoized", 0); | |
865 | scm_set_smob_mark (scm_tc16_memoized, scm_markcdr); | |
866 | scm_set_smob_print (scm_tc16_memoized, scm_print_memoized); | |
867 | ||
2cd72a84 AW |
868 | scm_tc16_memoizer = scm_make_smob_type ("memoizer", 0); |
869 | ||
b7742c6b | 870 | #include "libguile/memoize.x" |
4f692ace | 871 | |
4a655e50 | 872 | list_of_guile = scm_list_1 (scm_from_latin1_symbol ("guile")); |
b7742c6b AW |
873 | } |
874 | ||
875 | /* | |
876 | Local Variables: | |
877 | c-file-style: "gnu" | |
878 | End: | |
879 | */ |