| 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, |
| 2 | * 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 |
| 3 | * Free Software Foundation, Inc. |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public License |
| 7 | * as published by the Free Software Foundation; either version 3 of |
| 8 | * the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 18 | * 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | \f |
| 22 | |
| 23 | #ifdef HAVE_CONFIG_H |
| 24 | # include <config.h> |
| 25 | #endif |
| 26 | |
| 27 | #include "libguile/__scm.h" |
| 28 | #include "libguile/_scm.h" |
| 29 | #include "libguile/continuations.h" |
| 30 | #include "libguile/eq.h" |
| 31 | #include "libguile/expand.h" |
| 32 | #include "libguile/list.h" |
| 33 | #include "libguile/macros.h" |
| 34 | #include "libguile/memoize.h" |
| 35 | #include "libguile/modules.h" |
| 36 | #include "libguile/srcprop.h" |
| 37 | #include "libguile/ports.h" |
| 38 | #include "libguile/print.h" |
| 39 | #include "libguile/strings.h" |
| 40 | #include "libguile/throw.h" |
| 41 | #include "libguile/validate.h" |
| 42 | |
| 43 | |
| 44 | \f |
| 45 | |
| 46 | |
| 47 | #define CAR(x) SCM_CAR(x) |
| 48 | #define CDR(x) SCM_CDR(x) |
| 49 | #define CAAR(x) SCM_CAAR(x) |
| 50 | #define CADR(x) SCM_CADR(x) |
| 51 | #define CDAR(x) SCM_CDAR(x) |
| 52 | #define CDDR(x) SCM_CDDR(x) |
| 53 | #define CADDR(x) SCM_CADDR(x) |
| 54 | #define CDDDR(x) SCM_CDDDR(x) |
| 55 | #define CADDDR(x) SCM_CADDDR(x) |
| 56 | |
| 57 | |
| 58 | SCM_SYMBOL (sym_case_lambda_star, "case-lambda*"); |
| 59 | |
| 60 | \f |
| 61 | |
| 62 | |
| 63 | /* {Evaluator memoized expressions} |
| 64 | */ |
| 65 | |
| 66 | scm_t_bits scm_tc16_memoized; |
| 67 | |
| 68 | #define MAKMEMO(n, args) \ |
| 69 | (scm_cell (scm_tc16_memoized | ((n) << 16), SCM_UNPACK (args))) |
| 70 | |
| 71 | #define MAKMEMO_BEGIN(exps) \ |
| 72 | MAKMEMO (SCM_M_BEGIN, exps) |
| 73 | #define MAKMEMO_IF(test, then, else_) \ |
| 74 | MAKMEMO (SCM_M_IF, scm_cons (test, scm_cons (then, else_))) |
| 75 | #define FIXED_ARITY(nreq) \ |
| 76 | scm_list_1 (SCM_I_MAKINUM (nreq)) |
| 77 | #define REST_ARITY(nreq, rest) \ |
| 78 | scm_list_2 (SCM_I_MAKINUM (nreq), rest) |
| 79 | #define FULL_ARITY(nreq, rest, nopt, kw, inits, alt) \ |
| 80 | scm_list_n (SCM_I_MAKINUM (nreq), rest, SCM_I_MAKINUM (nopt), kw, inits, \ |
| 81 | alt, SCM_UNDEFINED) |
| 82 | #define MAKMEMO_LAMBDA(body, arity, docstring) \ |
| 83 | MAKMEMO (SCM_M_LAMBDA, \ |
| 84 | scm_cons (body, scm_cons (docstring, arity))) |
| 85 | #define MAKMEMO_LET(inits, body) \ |
| 86 | MAKMEMO (SCM_M_LET, scm_cons (inits, body)) |
| 87 | #define MAKMEMO_QUOTE(exp) \ |
| 88 | MAKMEMO (SCM_M_QUOTE, exp) |
| 89 | #define MAKMEMO_DEFINE(var, val) \ |
| 90 | MAKMEMO (SCM_M_DEFINE, scm_cons (var, val)) |
| 91 | #define MAKMEMO_DYNWIND(in, expr, out) \ |
| 92 | MAKMEMO (SCM_M_DYNWIND, scm_cons (in, scm_cons (expr, out))) |
| 93 | #define MAKMEMO_WITH_FLUIDS(fluids, vals, expr) \ |
| 94 | MAKMEMO (SCM_M_WITH_FLUIDS, scm_cons (fluids, scm_cons (vals, expr))) |
| 95 | #define MAKMEMO_APPLY(proc, args)\ |
| 96 | MAKMEMO (SCM_M_APPLY, scm_list_2 (proc, args)) |
| 97 | #define MAKMEMO_CONT(proc) \ |
| 98 | MAKMEMO (SCM_M_CONT, proc) |
| 99 | #define MAKMEMO_CALL_WITH_VALUES(prod, cons) \ |
| 100 | MAKMEMO (SCM_M_CALL_WITH_VALUES, scm_cons (prod, cons)) |
| 101 | #define MAKMEMO_CALL(proc, nargs, args) \ |
| 102 | MAKMEMO (SCM_M_CALL, scm_cons (proc, scm_cons (SCM_I_MAKINUM (nargs), args))) |
| 103 | #define MAKMEMO_LEX_REF(n) \ |
| 104 | MAKMEMO (SCM_M_LEXICAL_REF, SCM_I_MAKINUM (n)) |
| 105 | #define MAKMEMO_LEX_SET(n, val) \ |
| 106 | MAKMEMO (SCM_M_LEXICAL_SET, scm_cons (SCM_I_MAKINUM (n), val)) |
| 107 | #define MAKMEMO_TOP_REF(var) \ |
| 108 | MAKMEMO (SCM_M_TOPLEVEL_REF, var) |
| 109 | #define MAKMEMO_TOP_SET(var, val) \ |
| 110 | MAKMEMO (SCM_M_TOPLEVEL_SET, scm_cons (var, val)) |
| 111 | #define MAKMEMO_MOD_REF(mod, var, public) \ |
| 112 | MAKMEMO (SCM_M_MODULE_REF, scm_cons (mod, scm_cons (var, public))) |
| 113 | #define MAKMEMO_MOD_SET(val, mod, var, public) \ |
| 114 | MAKMEMO (SCM_M_MODULE_SET, scm_cons (val, scm_cons (mod, scm_cons (var, public)))) |
| 115 | #define MAKMEMO_PROMPT(tag, exp, handler) \ |
| 116 | MAKMEMO (SCM_M_PROMPT, scm_cons (tag, scm_cons (exp, handler))) |
| 117 | |
| 118 | |
| 119 | /* Primitives for the evaluator */ |
| 120 | scm_t_bits scm_tc16_memoizer; |
| 121 | #define SCM_MEMOIZER_P(x) (SCM_SMOB_PREDICATE (scm_tc16_memoizer, (x))) |
| 122 | #define SCM_MEMOIZER(M) (SCM_SMOB_OBJECT_1 (M)) |
| 123 | |
| 124 | \f |
| 125 | |
| 126 | /* This table must agree with the list of M_ constants in memoize.h */ |
| 127 | static const char *const memoized_tags[] = |
| 128 | { |
| 129 | "begin", |
| 130 | "if", |
| 131 | "lambda", |
| 132 | "let", |
| 133 | "quote", |
| 134 | "define", |
| 135 | "dynwind", |
| 136 | "with-fluids", |
| 137 | "apply", |
| 138 | "call/cc", |
| 139 | "call-with-values", |
| 140 | "call", |
| 141 | "lexical-ref", |
| 142 | "lexical-set!", |
| 143 | "toplevel-ref", |
| 144 | "toplevel-set!", |
| 145 | "module-ref", |
| 146 | "module-set!", |
| 147 | "prompt", |
| 148 | }; |
| 149 | |
| 150 | static int |
| 151 | scm_print_memoized (SCM memoized, SCM port, scm_print_state *pstate) |
| 152 | { |
| 153 | scm_puts ("#<memoized ", port); |
| 154 | scm_write (scm_unmemoize_expression (memoized), port); |
| 155 | scm_puts (">", port); |
| 156 | return 1; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | \f |
| 161 | |
| 162 | |
| 163 | static int |
| 164 | lookup (SCM x, SCM env) |
| 165 | { |
| 166 | int i = 0; |
| 167 | for (; scm_is_pair (env); env = CDR (env), i++) |
| 168 | if (scm_is_eq (x, CAR (env))) |
| 169 | return i; /* bound */ |
| 170 | abort (); |
| 171 | } |
| 172 | |
| 173 | |
| 174 | /* Abbreviate SCM_EXPANDED_REF. Copied because I'm not sure about symbol pasting */ |
| 175 | #define REF(x,type,field) \ |
| 176 | (scm_struct_ref (x, SCM_I_MAKINUM (SCM_EXPANDED_##type##_##field))) |
| 177 | |
| 178 | static SCM list_of_guile = SCM_BOOL_F; |
| 179 | |
| 180 | static SCM memoize (SCM exp, SCM env); |
| 181 | |
| 182 | static SCM |
| 183 | memoize_exps (SCM exps, SCM env) |
| 184 | { |
| 185 | SCM ret; |
| 186 | for (ret = SCM_EOL; scm_is_pair (exps); exps = CDR (exps)) |
| 187 | ret = scm_cons (memoize (CAR (exps), env), ret); |
| 188 | return scm_reverse_x (ret, SCM_UNDEFINED); |
| 189 | } |
| 190 | |
| 191 | static SCM |
| 192 | memoize (SCM exp, SCM env) |
| 193 | { |
| 194 | if (!SCM_EXPANDED_P (exp)) |
| 195 | abort (); |
| 196 | |
| 197 | switch (SCM_EXPANDED_TYPE (exp)) |
| 198 | { |
| 199 | case SCM_EXPANDED_VOID: |
| 200 | return MAKMEMO_QUOTE (SCM_UNSPECIFIED); |
| 201 | |
| 202 | case SCM_EXPANDED_CONST: |
| 203 | return MAKMEMO_QUOTE (REF (exp, CONST, EXP)); |
| 204 | |
| 205 | case SCM_EXPANDED_PRIMITIVE_REF: |
| 206 | if (scm_is_eq (scm_current_module (), scm_the_root_module ())) |
| 207 | return MAKMEMO_TOP_REF (REF (exp, PRIMITIVE_REF, NAME)); |
| 208 | else |
| 209 | return MAKMEMO_MOD_REF (list_of_guile, REF (exp, PRIMITIVE_REF, NAME), |
| 210 | SCM_BOOL_F); |
| 211 | |
| 212 | case SCM_EXPANDED_LEXICAL_REF: |
| 213 | return MAKMEMO_LEX_REF (lookup (REF (exp, LEXICAL_REF, GENSYM), env)); |
| 214 | |
| 215 | case SCM_EXPANDED_LEXICAL_SET: |
| 216 | return MAKMEMO_LEX_SET (lookup (REF (exp, LEXICAL_SET, GENSYM), env), |
| 217 | memoize (REF (exp, LEXICAL_SET, EXP), env)); |
| 218 | |
| 219 | case SCM_EXPANDED_MODULE_REF: |
| 220 | return MAKMEMO_MOD_REF (REF (exp, MODULE_REF, MOD), |
| 221 | REF (exp, MODULE_REF, NAME), |
| 222 | REF (exp, MODULE_REF, PUBLIC)); |
| 223 | |
| 224 | case SCM_EXPANDED_MODULE_SET: |
| 225 | return MAKMEMO_MOD_SET (memoize (REF (exp, MODULE_SET, EXP), env), |
| 226 | REF (exp, MODULE_SET, MOD), |
| 227 | REF (exp, MODULE_SET, NAME), |
| 228 | REF (exp, MODULE_SET, PUBLIC)); |
| 229 | |
| 230 | case SCM_EXPANDED_TOPLEVEL_REF: |
| 231 | return MAKMEMO_TOP_REF (REF (exp, TOPLEVEL_REF, NAME)); |
| 232 | |
| 233 | case SCM_EXPANDED_TOPLEVEL_SET: |
| 234 | return MAKMEMO_TOP_SET (REF (exp, TOPLEVEL_SET, NAME), |
| 235 | memoize (REF (exp, TOPLEVEL_SET, EXP), env)); |
| 236 | |
| 237 | case SCM_EXPANDED_TOPLEVEL_DEFINE: |
| 238 | return MAKMEMO_DEFINE (REF (exp, TOPLEVEL_DEFINE, NAME), |
| 239 | memoize (REF (exp, TOPLEVEL_DEFINE, EXP), env)); |
| 240 | |
| 241 | case SCM_EXPANDED_CONDITIONAL: |
| 242 | return MAKMEMO_IF (memoize (REF (exp, CONDITIONAL, TEST), env), |
| 243 | memoize (REF (exp, CONDITIONAL, CONSEQUENT), env), |
| 244 | memoize (REF (exp, CONDITIONAL, ALTERNATE), env)); |
| 245 | |
| 246 | case SCM_EXPANDED_APPLICATION: |
| 247 | { |
| 248 | SCM proc, args; |
| 249 | |
| 250 | proc = REF (exp, APPLICATION, PROC); |
| 251 | args = memoize_exps (REF (exp, APPLICATION, ARGS), env); |
| 252 | |
| 253 | if (SCM_EXPANDED_TYPE (proc) == SCM_EXPANDED_TOPLEVEL_REF) |
| 254 | { |
| 255 | SCM var = scm_module_variable (scm_current_module (), |
| 256 | REF (proc, TOPLEVEL_REF, NAME)); |
| 257 | if (SCM_VARIABLEP (var)) |
| 258 | { |
| 259 | SCM val = SCM_VARIABLE_REF (var); |
| 260 | if (SCM_MEMOIZER_P (val)) |
| 261 | return scm_apply (SCM_SMOB_OBJECT_1 (val), args, SCM_EOL); |
| 262 | } |
| 263 | } |
| 264 | /* otherwise we all fall down here */ |
| 265 | return MAKMEMO_CALL (memoize (proc, env), scm_ilength (args), args); |
| 266 | } |
| 267 | |
| 268 | case SCM_EXPANDED_SEQUENCE: |
| 269 | return MAKMEMO_BEGIN (memoize_exps (REF (exp, SEQUENCE, EXPS), env)); |
| 270 | |
| 271 | case SCM_EXPANDED_LAMBDA: |
| 272 | /* The body will be a lambda-case or #f. */ |
| 273 | { |
| 274 | SCM meta, docstring, body, proc; |
| 275 | |
| 276 | meta = REF (exp, LAMBDA, META); |
| 277 | docstring = scm_assoc_ref (meta, scm_sym_documentation); |
| 278 | |
| 279 | body = REF (exp, LAMBDA, BODY); |
| 280 | if (scm_is_false (body)) |
| 281 | /* Give a body to case-lambda with no clauses. */ |
| 282 | proc = MAKMEMO_LAMBDA |
| 283 | (MAKMEMO_CALL |
| 284 | (MAKMEMO_MOD_REF (list_of_guile, |
| 285 | scm_from_latin1_symbol ("throw"), |
| 286 | SCM_BOOL_F), |
| 287 | 5, |
| 288 | scm_list_5 (MAKMEMO_QUOTE (scm_args_number_key), |
| 289 | MAKMEMO_QUOTE (SCM_BOOL_F), |
| 290 | MAKMEMO_QUOTE (scm_from_latin1_string |
| 291 | ("Wrong number of arguments")), |
| 292 | MAKMEMO_QUOTE (SCM_EOL), |
| 293 | MAKMEMO_QUOTE (SCM_BOOL_F))), |
| 294 | FIXED_ARITY (0), |
| 295 | SCM_BOOL_F /* docstring */); |
| 296 | else |
| 297 | proc = memoize (body, env); |
| 298 | |
| 299 | if (scm_is_string (docstring)) |
| 300 | { |
| 301 | SCM args = SCM_MEMOIZED_ARGS (proc); |
| 302 | SCM_SETCAR (SCM_CDR (args), docstring); |
| 303 | } |
| 304 | |
| 305 | return proc; |
| 306 | } |
| 307 | |
| 308 | case SCM_EXPANDED_LAMBDA_CASE: |
| 309 | { |
| 310 | SCM req, rest, opt, kw, inits, vars, body, alt; |
| 311 | SCM walk, minits, arity, new_env; |
| 312 | int nreq, nopt, ntotal; |
| 313 | |
| 314 | req = REF (exp, LAMBDA_CASE, REQ); |
| 315 | rest = scm_not (scm_not (REF (exp, LAMBDA_CASE, REST))); |
| 316 | opt = REF (exp, LAMBDA_CASE, OPT); |
| 317 | kw = REF (exp, LAMBDA_CASE, KW); |
| 318 | inits = REF (exp, LAMBDA_CASE, INITS); |
| 319 | vars = REF (exp, LAMBDA_CASE, GENSYMS); |
| 320 | body = REF (exp, LAMBDA_CASE, BODY); |
| 321 | alt = REF (exp, LAMBDA_CASE, ALTERNATE); |
| 322 | |
| 323 | nreq = scm_ilength (req); |
| 324 | nopt = scm_is_pair (opt) ? scm_ilength (opt) : 0; |
| 325 | ntotal = scm_ilength (vars); |
| 326 | |
| 327 | /* The vars are the gensyms, according to the divine plan. But we need |
| 328 | to memoize the inits within their appropriate environment, |
| 329 | complicating things. */ |
| 330 | new_env = env; |
| 331 | for (walk = req; scm_is_pair (walk); |
| 332 | walk = CDR (walk), vars = CDR (vars)) |
| 333 | new_env = scm_cons (CAR (vars), new_env); |
| 334 | |
| 335 | minits = SCM_EOL; |
| 336 | for (walk = opt; scm_is_pair (walk); |
| 337 | walk = CDR (walk), vars = CDR (vars), inits = CDR (inits)) |
| 338 | { |
| 339 | minits = scm_cons (memoize (CAR (inits), new_env), minits); |
| 340 | new_env = scm_cons (CAR (vars), new_env); |
| 341 | } |
| 342 | |
| 343 | if (scm_is_true (rest)) |
| 344 | { |
| 345 | new_env = scm_cons (CAR (vars), new_env); |
| 346 | vars = CDR (vars); |
| 347 | } |
| 348 | |
| 349 | for (; scm_is_pair (inits); vars = CDR (vars), inits = CDR (inits)) |
| 350 | { |
| 351 | minits = scm_cons (memoize (CAR (inits), new_env), minits); |
| 352 | new_env = scm_cons (CAR (vars), new_env); |
| 353 | } |
| 354 | if (!scm_is_null (vars)) |
| 355 | abort (); |
| 356 | |
| 357 | minits = scm_reverse_x (minits, SCM_UNDEFINED); |
| 358 | |
| 359 | if (scm_is_true (kw)) |
| 360 | { |
| 361 | /* (aok? (kw name sym) ...) -> (aok? (kw . index) ...) */ |
| 362 | SCM aok = CAR (kw), indices = SCM_EOL; |
| 363 | for (kw = CDR (kw); scm_is_pair (kw); kw = CDR (kw)) |
| 364 | { |
| 365 | SCM k; |
| 366 | int idx; |
| 367 | |
| 368 | k = CAR (CAR (kw)); |
| 369 | idx = ntotal - 1 - lookup (CADDR (CAR (kw)), new_env); |
| 370 | indices = scm_acons (k, SCM_I_MAKINUM (idx), indices); |
| 371 | } |
| 372 | kw = scm_cons (aok, scm_reverse_x (indices, SCM_UNDEFINED)); |
| 373 | } |
| 374 | |
| 375 | if (scm_is_false (alt) && scm_is_false (kw) && scm_is_false (opt)) |
| 376 | { |
| 377 | if (scm_is_false (rest)) |
| 378 | arity = FIXED_ARITY (nreq); |
| 379 | else |
| 380 | arity = REST_ARITY (nreq, SCM_BOOL_T); |
| 381 | } |
| 382 | else if (scm_is_true (alt)) |
| 383 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, |
| 384 | SCM_MEMOIZED_ARGS (memoize (alt, env))); |
| 385 | else |
| 386 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, SCM_BOOL_F); |
| 387 | |
| 388 | return MAKMEMO_LAMBDA (memoize (body, new_env), arity, |
| 389 | SCM_BOOL_F /* docstring */); |
| 390 | } |
| 391 | |
| 392 | case SCM_EXPANDED_LET: |
| 393 | { |
| 394 | SCM vars, exps, body, inits, new_env; |
| 395 | |
| 396 | vars = REF (exp, LET, GENSYMS); |
| 397 | exps = REF (exp, LET, VALS); |
| 398 | body = REF (exp, LET, BODY); |
| 399 | |
| 400 | inits = SCM_EOL; |
| 401 | new_env = env; |
| 402 | for (; scm_is_pair (vars); vars = CDR (vars), exps = CDR (exps)) |
| 403 | { |
| 404 | new_env = scm_cons (CAR (vars), new_env); |
| 405 | inits = scm_cons (memoize (CAR (exps), env), inits); |
| 406 | } |
| 407 | |
| 408 | return MAKMEMO_LET (scm_reverse_x (inits, SCM_UNDEFINED), |
| 409 | memoize (body, new_env)); |
| 410 | } |
| 411 | |
| 412 | case SCM_EXPANDED_LETREC: |
| 413 | { |
| 414 | SCM vars, exps, body, undefs, new_env; |
| 415 | int i, nvars, in_order_p; |
| 416 | |
| 417 | vars = REF (exp, LETREC, GENSYMS); |
| 418 | exps = REF (exp, LETREC, VALS); |
| 419 | body = REF (exp, LETREC, BODY); |
| 420 | in_order_p = scm_is_true (REF (exp, LETREC, IN_ORDER_P)); |
| 421 | nvars = i = scm_ilength (vars); |
| 422 | undefs = SCM_EOL; |
| 423 | new_env = env; |
| 424 | |
| 425 | for (; scm_is_pair (vars); vars = CDR (vars)) |
| 426 | { |
| 427 | new_env = scm_cons (CAR (vars), new_env); |
| 428 | undefs = scm_cons (MAKMEMO_QUOTE (SCM_UNDEFINED), undefs); |
| 429 | } |
| 430 | |
| 431 | if (in_order_p) |
| 432 | { |
| 433 | SCM body_exps = SCM_EOL; |
| 434 | for (; scm_is_pair (exps); exps = CDR (exps), i--) |
| 435 | body_exps = scm_cons (MAKMEMO_LEX_SET (i-1, |
| 436 | memoize (CAR (exps), new_env)), |
| 437 | body_exps); |
| 438 | body_exps = scm_cons (memoize (body, new_env), body_exps); |
| 439 | body_exps = scm_reverse_x (body_exps, SCM_UNDEFINED); |
| 440 | return MAKMEMO_LET (undefs, MAKMEMO_BEGIN (body_exps)); |
| 441 | } |
| 442 | else |
| 443 | { |
| 444 | SCM sets = SCM_EOL, inits = SCM_EOL; |
| 445 | for (; scm_is_pair (exps); exps = CDR (exps), i--) |
| 446 | { |
| 447 | sets = scm_cons (MAKMEMO_LEX_SET ((i-1) + nvars, |
| 448 | MAKMEMO_LEX_REF (i-1)), |
| 449 | sets); |
| 450 | inits = scm_cons (memoize (CAR (exps), new_env), inits); |
| 451 | } |
| 452 | inits = scm_reverse_x (inits, SCM_UNDEFINED); |
| 453 | return MAKMEMO_LET |
| 454 | (undefs, |
| 455 | MAKMEMO_BEGIN (scm_list_2 (MAKMEMO_LET (inits, MAKMEMO_BEGIN (sets)), |
| 456 | memoize (body, new_env)))); |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | case SCM_EXPANDED_DYNLET: |
| 461 | return MAKMEMO_WITH_FLUIDS (memoize_exps (REF (exp, DYNLET, FLUIDS), env), |
| 462 | memoize_exps (REF (exp, DYNLET, VALS), env), |
| 463 | memoize (REF (exp, DYNLET, BODY), env)); |
| 464 | |
| 465 | default: |
| 466 | abort (); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | |
| 471 | \f |
| 472 | |
| 473 | SCM_DEFINE (scm_memoize_expression, "memoize-expression", 1, 0, 0, |
| 474 | (SCM exp), |
| 475 | "Memoize the expression @var{exp}.") |
| 476 | #define FUNC_NAME s_scm_memoize_expression |
| 477 | { |
| 478 | SCM_ASSERT_TYPE (SCM_EXPANDED_P (exp), exp, 1, FUNC_NAME, "expanded"); |
| 479 | return memoize (exp, scm_current_module ()); |
| 480 | } |
| 481 | #undef FUNC_NAME |
| 482 | |
| 483 | |
| 484 | \f |
| 485 | |
| 486 | #define SCM_MAKE_MEMOIZER(STR, MEMOIZER, N) \ |
| 487 | (scm_cell (scm_tc16_memoizer, \ |
| 488 | SCM_UNPACK (scm_c_make_gsubr (STR, N, 0, 0, MEMOIZER)))) |
| 489 | #define SCM_DEFINE_MEMOIZER(STR, MEMOIZER, N) \ |
| 490 | SCM_SNARF_INIT(scm_c_define (STR, SCM_MAKE_MEMOIZER (STR, MEMOIZER, N))) |
| 491 | |
| 492 | #define SCM_MAKE_REST_MEMOIZER(STR, MEMOIZER, N) \ |
| 493 | (scm_cell (scm_tc16_memoizer, \ |
| 494 | SCM_UNPACK ((scm_c_make_gsubr (STR, N, 0, 1, MEMOIZER))))) |
| 495 | #define SCM_DEFINE_REST_MEMOIZER(STR, MEMOIZER, N) \ |
| 496 | SCM_SNARF_INIT(scm_c_define (STR, SCM_MAKE_REST_MEMOIZER (STR, MEMOIZER, N))) |
| 497 | |
| 498 | static SCM m_apply (SCM proc, SCM arg, SCM rest); |
| 499 | static SCM m_call_cc (SCM proc); |
| 500 | static SCM m_call_values (SCM prod, SCM cons); |
| 501 | static SCM m_dynamic_wind (SCM pre, SCM exp, SCM post); |
| 502 | static SCM m_prompt (SCM tag, SCM exp, SCM handler); |
| 503 | |
| 504 | SCM_DEFINE_REST_MEMOIZER ("@apply", m_apply, 2); |
| 505 | SCM_DEFINE_MEMOIZER ("@call-with-current-continuation", m_call_cc, 1); |
| 506 | SCM_DEFINE_MEMOIZER ("@call-with-values", m_call_values, 2); |
| 507 | SCM_DEFINE_MEMOIZER ("@dynamic-wind", m_dynamic_wind, 3); |
| 508 | SCM_DEFINE_MEMOIZER ("@prompt", m_prompt, 3); |
| 509 | |
| 510 | |
| 511 | \f |
| 512 | |
| 513 | static SCM m_apply (SCM proc, SCM arg, SCM rest) |
| 514 | #define FUNC_NAME "@apply" |
| 515 | { |
| 516 | long len; |
| 517 | |
| 518 | SCM_VALIDATE_MEMOIZED (1, proc); |
| 519 | SCM_VALIDATE_MEMOIZED (2, arg); |
| 520 | len = scm_ilength (rest); |
| 521 | if (len < 0) |
| 522 | abort (); |
| 523 | else if (len == 0) |
| 524 | return MAKMEMO_APPLY (proc, arg); |
| 525 | else |
| 526 | { |
| 527 | SCM tail; |
| 528 | |
| 529 | rest = scm_reverse (rest); |
| 530 | tail = scm_car (rest); |
| 531 | rest = scm_cdr (rest); |
| 532 | len--; |
| 533 | |
| 534 | while (scm_is_pair (rest)) |
| 535 | { |
| 536 | tail = MAKMEMO_CALL (MAKMEMO_MOD_REF (scm_list_1 (scm_from_latin1_symbol ("guile")), |
| 537 | scm_from_latin1_symbol ("cons"), |
| 538 | SCM_BOOL_F), |
| 539 | 2, |
| 540 | scm_list_2 (scm_car (rest), tail)); |
| 541 | rest = scm_cdr (rest); |
| 542 | } |
| 543 | return MAKMEMO_APPLY (proc, tail); |
| 544 | } |
| 545 | } |
| 546 | #undef FUNC_NAME |
| 547 | |
| 548 | static SCM m_call_cc (SCM proc) |
| 549 | #define FUNC_NAME "@call-with-current-continuation" |
| 550 | { |
| 551 | SCM_VALIDATE_MEMOIZED (1, proc); |
| 552 | return MAKMEMO_CONT (proc); |
| 553 | } |
| 554 | #undef FUNC_NAME |
| 555 | |
| 556 | static SCM m_call_values (SCM prod, SCM cons) |
| 557 | #define FUNC_NAME "@call-with-values" |
| 558 | { |
| 559 | SCM_VALIDATE_MEMOIZED (1, prod); |
| 560 | SCM_VALIDATE_MEMOIZED (2, cons); |
| 561 | return MAKMEMO_CALL_WITH_VALUES (prod, cons); |
| 562 | } |
| 563 | #undef FUNC_NAME |
| 564 | |
| 565 | static SCM m_dynamic_wind (SCM in, SCM expr, SCM out) |
| 566 | #define FUNC_NAME "memoize-dynwind" |
| 567 | { |
| 568 | SCM_VALIDATE_MEMOIZED (1, in); |
| 569 | SCM_VALIDATE_MEMOIZED (2, expr); |
| 570 | SCM_VALIDATE_MEMOIZED (3, out); |
| 571 | return MAKMEMO_DYNWIND (in, expr, out); |
| 572 | } |
| 573 | #undef FUNC_NAME |
| 574 | |
| 575 | static SCM m_prompt (SCM tag, SCM exp, SCM handler) |
| 576 | #define FUNC_NAME "@prompt" |
| 577 | { |
| 578 | SCM_VALIDATE_MEMOIZED (1, tag); |
| 579 | SCM_VALIDATE_MEMOIZED (2, exp); |
| 580 | SCM_VALIDATE_MEMOIZED (3, handler); |
| 581 | return MAKMEMO_PROMPT (tag, exp, handler); |
| 582 | } |
| 583 | #undef FUNC_NAME |
| 584 | |
| 585 | |
| 586 | \f |
| 587 | |
| 588 | SCM_SYMBOL (sym_placeholder, "_"); |
| 589 | |
| 590 | static SCM unmemoize (SCM expr); |
| 591 | |
| 592 | static SCM |
| 593 | unmemoize_exprs (SCM exprs) |
| 594 | { |
| 595 | SCM ret, tail; |
| 596 | if (scm_is_null (exprs)) |
| 597 | return SCM_EOL; |
| 598 | ret = scm_list_1 (unmemoize (CAR (exprs))); |
| 599 | tail = ret; |
| 600 | for (exprs = CDR (exprs); !scm_is_null (exprs); exprs = CDR (exprs)) |
| 601 | { |
| 602 | SCM_SETCDR (tail, scm_list_1 (unmemoize (CAR (exprs)))); |
| 603 | tail = CDR (tail); |
| 604 | } |
| 605 | return ret; |
| 606 | } |
| 607 | |
| 608 | static SCM |
| 609 | unmemoize_bindings (SCM inits) |
| 610 | { |
| 611 | SCM ret, tail; |
| 612 | if (scm_is_null (inits)) |
| 613 | return SCM_EOL; |
| 614 | ret = scm_list_1 (scm_list_2 (sym_placeholder, unmemoize (CAR (inits)))); |
| 615 | tail = ret; |
| 616 | for (inits = CDR (inits); !scm_is_null (inits); inits = CDR (inits)) |
| 617 | { |
| 618 | SCM_SETCDR (tail, scm_list_1 (scm_list_2 (sym_placeholder, |
| 619 | unmemoize (CAR (inits))))); |
| 620 | tail = CDR (tail); |
| 621 | } |
| 622 | return ret; |
| 623 | } |
| 624 | |
| 625 | static SCM |
| 626 | unmemoize_lexical (SCM n) |
| 627 | { |
| 628 | char buf[16]; |
| 629 | buf[15] = 0; |
| 630 | snprintf (buf, 15, "<%u>", scm_to_uint32 (n)); |
| 631 | return scm_from_locale_symbol (buf); |
| 632 | } |
| 633 | |
| 634 | static SCM |
| 635 | unmemoize (const SCM expr) |
| 636 | { |
| 637 | SCM args; |
| 638 | |
| 639 | if (!SCM_MEMOIZED_P (expr)) |
| 640 | abort (); |
| 641 | |
| 642 | args = SCM_MEMOIZED_ARGS (expr); |
| 643 | switch (SCM_MEMOIZED_TAG (expr)) |
| 644 | { |
| 645 | case SCM_M_APPLY: |
| 646 | return scm_cons (scm_sym_atapply, unmemoize_exprs (args)); |
| 647 | case SCM_M_BEGIN: |
| 648 | return scm_cons (scm_sym_begin, unmemoize_exprs (args)); |
| 649 | case SCM_M_CALL: |
| 650 | return scm_cons (unmemoize (CAR (args)), unmemoize_exprs (CDDR (args))); |
| 651 | case SCM_M_CONT: |
| 652 | return scm_list_2 (scm_sym_atcall_cc, unmemoize (args)); |
| 653 | case SCM_M_CALL_WITH_VALUES: |
| 654 | return scm_list_3 (scm_sym_at_call_with_values, |
| 655 | unmemoize (CAR (args)), unmemoize (CDR (args))); |
| 656 | case SCM_M_DEFINE: |
| 657 | return scm_list_3 (scm_sym_define, CAR (args), unmemoize (CDR (args))); |
| 658 | case SCM_M_DYNWIND: |
| 659 | return scm_list_4 (scm_sym_at_dynamic_wind, |
| 660 | unmemoize (CAR (args)), |
| 661 | unmemoize (CADR (args)), |
| 662 | unmemoize (CDDR (args))); |
| 663 | case SCM_M_WITH_FLUIDS: |
| 664 | { |
| 665 | SCM binds = SCM_EOL, fluids, vals; |
| 666 | for (fluids = CAR (args), vals = CADR (args); scm_is_pair (fluids); |
| 667 | fluids = CDR (fluids), vals = CDR (vals)) |
| 668 | binds = scm_cons (scm_list_2 (unmemoize (CAR (fluids)), |
| 669 | unmemoize (CAR (vals))), |
| 670 | binds); |
| 671 | return scm_list_3 (scm_sym_with_fluids, |
| 672 | scm_reverse_x (binds, SCM_UNDEFINED), |
| 673 | unmemoize (CDDR (args))); |
| 674 | } |
| 675 | case SCM_M_IF: |
| 676 | return scm_list_4 (scm_sym_if, unmemoize (scm_car (args)), |
| 677 | unmemoize (scm_cadr (args)), unmemoize (scm_cddr (args))); |
| 678 | case SCM_M_LAMBDA: |
| 679 | { |
| 680 | SCM body = CAR (args), spec = CDDR (args); |
| 681 | |
| 682 | if (scm_is_null (CDR (spec))) |
| 683 | return scm_list_3 (scm_sym_lambda, |
| 684 | scm_make_list (CAR (spec), sym_placeholder), |
| 685 | unmemoize (CAR (args))); |
| 686 | else if (scm_is_null (SCM_CDDR (spec))) |
| 687 | { |
| 688 | SCM formals = scm_make_list (CAR (spec), sym_placeholder); |
| 689 | return scm_list_3 (scm_sym_lambda, |
| 690 | scm_is_true (CADR (spec)) |
| 691 | ? scm_cons_star (sym_placeholder, formals) |
| 692 | : formals, |
| 693 | unmemoize (CAR (args))); |
| 694 | } |
| 695 | else |
| 696 | { |
| 697 | SCM alt, tail; |
| 698 | |
| 699 | alt = CADDR (CDDDR (spec)); |
| 700 | if (scm_is_true (alt)) |
| 701 | tail = CDR (unmemoize (alt)); |
| 702 | else |
| 703 | tail = SCM_EOL; |
| 704 | |
| 705 | return scm_cons |
| 706 | (sym_case_lambda_star, |
| 707 | scm_cons (scm_list_2 (scm_list_5 (CAR (spec), |
| 708 | CADR (spec), |
| 709 | CADDR (spec), |
| 710 | CADDDR (spec), |
| 711 | unmemoize_exprs (CADR (CDDDR (spec)))), |
| 712 | unmemoize (body)), |
| 713 | tail)); |
| 714 | } |
| 715 | } |
| 716 | case SCM_M_LET: |
| 717 | return scm_list_3 (scm_sym_let, |
| 718 | unmemoize_bindings (CAR (args)), |
| 719 | unmemoize (CDR (args))); |
| 720 | case SCM_M_QUOTE: |
| 721 | return scm_list_2 (scm_sym_quote, args); |
| 722 | case SCM_M_LEXICAL_REF: |
| 723 | return unmemoize_lexical (args); |
| 724 | case SCM_M_LEXICAL_SET: |
| 725 | return scm_list_3 (scm_sym_set_x, unmemoize_lexical (CAR (args)), |
| 726 | unmemoize (CDR (args))); |
| 727 | case SCM_M_TOPLEVEL_REF: |
| 728 | return args; |
| 729 | case SCM_M_TOPLEVEL_SET: |
| 730 | return scm_list_3 (scm_sym_set_x, CAR (args), unmemoize (CDR (args))); |
| 731 | case SCM_M_MODULE_REF: |
| 732 | return SCM_VARIABLEP (args) ? args |
| 733 | : scm_list_3 (scm_is_true (CDDR (args)) ? scm_sym_at : scm_sym_atat, |
| 734 | scm_i_finite_list_copy (CAR (args)), |
| 735 | CADR (args)); |
| 736 | case SCM_M_MODULE_SET: |
| 737 | return scm_list_3 (scm_sym_set_x, |
| 738 | SCM_VARIABLEP (CDR (args)) ? CDR (args) |
| 739 | : scm_list_3 (scm_is_true (CDDDR (args)) |
| 740 | ? scm_sym_at : scm_sym_atat, |
| 741 | scm_i_finite_list_copy (CADR (args)), |
| 742 | CADDR (args)), |
| 743 | unmemoize (CAR (args))); |
| 744 | case SCM_M_PROMPT: |
| 745 | return scm_list_4 (scm_sym_at_prompt, |
| 746 | unmemoize (CAR (args)), |
| 747 | unmemoize (CADR (args)), |
| 748 | unmemoize (CDDR (args))); |
| 749 | default: |
| 750 | abort (); |
| 751 | } |
| 752 | } |
| 753 | |
| 754 | |
| 755 | \f |
| 756 | |
| 757 | SCM_DEFINE (scm_memoized_p, "memoized?", 1, 0, 0, |
| 758 | (SCM obj), |
| 759 | "Return @code{#t} if @var{obj} is memoized.") |
| 760 | #define FUNC_NAME s_scm_memoized_p |
| 761 | { |
| 762 | return scm_from_bool (SCM_MEMOIZED_P (obj)); |
| 763 | } |
| 764 | #undef FUNC_NAME |
| 765 | |
| 766 | SCM_DEFINE (scm_unmemoize_expression, "unmemoize-expression", 1, 0, 0, |
| 767 | (SCM m), |
| 768 | "Unmemoize the memoized expression @var{m}.") |
| 769 | #define FUNC_NAME s_scm_unmemoize_expression |
| 770 | { |
| 771 | SCM_VALIDATE_MEMOIZED (1, m); |
| 772 | return unmemoize (m); |
| 773 | } |
| 774 | #undef FUNC_NAME |
| 775 | |
| 776 | SCM_DEFINE (scm_memoized_expression_typecode, "memoized-expression-typecode", 1, 0, 0, |
| 777 | (SCM m), |
| 778 | "Return the typecode from the memoized expression @var{m}.") |
| 779 | #define FUNC_NAME s_scm_memoized_expression_typecode |
| 780 | { |
| 781 | SCM_VALIDATE_MEMOIZED (1, m); |
| 782 | |
| 783 | /* The tag is a 16-bit integer so it fits in an inum. */ |
| 784 | return SCM_I_MAKINUM (SCM_MEMOIZED_TAG (m)); |
| 785 | } |
| 786 | #undef FUNC_NAME |
| 787 | |
| 788 | SCM_DEFINE (scm_memoized_expression_data, "memoized-expression-data", 1, 0, 0, |
| 789 | (SCM m), |
| 790 | "Return the data from the memoized expression @var{m}.") |
| 791 | #define FUNC_NAME s_scm_memoized_expression_data |
| 792 | { |
| 793 | SCM_VALIDATE_MEMOIZED (1, m); |
| 794 | return SCM_MEMOIZED_ARGS (m); |
| 795 | } |
| 796 | #undef FUNC_NAME |
| 797 | |
| 798 | SCM_DEFINE (scm_memoized_typecode, "memoized-typecode", 1, 0, 0, |
| 799 | (SCM sym), |
| 800 | "Return the memoized typecode corresponding to the symbol @var{sym}.") |
| 801 | #define FUNC_NAME s_scm_memoized_typecode |
| 802 | { |
| 803 | int i; |
| 804 | |
| 805 | SCM_VALIDATE_SYMBOL (1, sym); |
| 806 | |
| 807 | for (i = 0; i < sizeof(memoized_tags)/sizeof(const char*); i++) |
| 808 | if (strcmp (scm_i_symbol_chars (sym), memoized_tags[i]) == 0) |
| 809 | return scm_from_int32 (i); |
| 810 | |
| 811 | return SCM_BOOL_F; |
| 812 | } |
| 813 | #undef FUNC_NAME |
| 814 | |
| 815 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); |
| 816 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; |
| 817 | static void error_unbound_variable (SCM symbol) |
| 818 | { |
| 819 | scm_error (scm_unbound_variable_key, NULL, "Unbound variable: ~S", |
| 820 | scm_list_1 (symbol), SCM_BOOL_F); |
| 821 | } |
| 822 | |
| 823 | SCM_DEFINE (scm_memoize_variable_access_x, "memoize-variable-access!", 2, 0, 0, |
| 824 | (SCM m, SCM mod), |
| 825 | "Look up and cache the variable that @var{m} will access, returning the variable.") |
| 826 | #define FUNC_NAME s_scm_memoize_variable_access_x |
| 827 | { |
| 828 | SCM mx; |
| 829 | SCM_VALIDATE_MEMOIZED (1, m); |
| 830 | mx = SCM_MEMOIZED_ARGS (m); |
| 831 | switch (SCM_MEMOIZED_TAG (m)) |
| 832 | { |
| 833 | case SCM_M_TOPLEVEL_REF: |
| 834 | if (SCM_VARIABLEP (mx)) |
| 835 | return mx; |
| 836 | else |
| 837 | { |
| 838 | SCM var = scm_module_variable (mod, mx); |
| 839 | if (scm_is_false (var) || scm_is_false (scm_variable_bound_p (var))) |
| 840 | error_unbound_variable (mx); |
| 841 | SCM_SET_SMOB_OBJECT (m, var); |
| 842 | return var; |
| 843 | } |
| 844 | |
| 845 | case SCM_M_TOPLEVEL_SET: |
| 846 | { |
| 847 | SCM var = CAR (mx); |
| 848 | if (SCM_VARIABLEP (var)) |
| 849 | return var; |
| 850 | else |
| 851 | { |
| 852 | var = scm_module_variable (mod, var); |
| 853 | if (scm_is_false (var)) |
| 854 | error_unbound_variable (CAR (mx)); |
| 855 | SCM_SETCAR (mx, var); |
| 856 | return var; |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | case SCM_M_MODULE_REF: |
| 861 | if (SCM_VARIABLEP (mx)) |
| 862 | return mx; |
| 863 | else |
| 864 | { |
| 865 | SCM var; |
| 866 | mod = scm_resolve_module (CAR (mx)); |
| 867 | if (scm_is_true (CDDR (mx))) |
| 868 | mod = scm_module_public_interface (mod); |
| 869 | var = scm_module_lookup (mod, CADR (mx)); |
| 870 | if (scm_is_false (scm_variable_bound_p (var))) |
| 871 | error_unbound_variable (CADR (mx)); |
| 872 | SCM_SET_SMOB_OBJECT (m, var); |
| 873 | return var; |
| 874 | } |
| 875 | |
| 876 | case SCM_M_MODULE_SET: |
| 877 | /* FIXME: not quite threadsafe */ |
| 878 | if (SCM_VARIABLEP (CDR (mx))) |
| 879 | return CDR (mx); |
| 880 | else |
| 881 | { |
| 882 | SCM var; |
| 883 | mod = scm_resolve_module (CADR (mx)); |
| 884 | if (scm_is_true (CDDDR (mx))) |
| 885 | mod = scm_module_public_interface (mod); |
| 886 | var = scm_module_lookup (mod, CADDR (mx)); |
| 887 | SCM_SETCDR (mx, var); |
| 888 | return var; |
| 889 | } |
| 890 | |
| 891 | default: |
| 892 | scm_wrong_type_arg (FUNC_NAME, 1, m); |
| 893 | return SCM_BOOL_F; |
| 894 | } |
| 895 | } |
| 896 | #undef FUNC_NAME |
| 897 | |
| 898 | |
| 899 | \f |
| 900 | |
| 901 | void |
| 902 | scm_init_memoize () |
| 903 | { |
| 904 | scm_tc16_memoized = scm_make_smob_type ("%memoized", 0); |
| 905 | scm_set_smob_print (scm_tc16_memoized, scm_print_memoized); |
| 906 | |
| 907 | scm_tc16_memoizer = scm_make_smob_type ("memoizer", 0); |
| 908 | |
| 909 | #include "libguile/memoize.x" |
| 910 | |
| 911 | list_of_guile = scm_list_1 (scm_from_latin1_symbol ("guile")); |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | Local Variables: |
| 916 | c-file-style: "gnu" |
| 917 | End: |
| 918 | */ |