| 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 | #define VECTOR_REF(v, i) (SCM_SIMPLE_VECTOR_REF (v, i)) |
| 58 | #define VECTOR_SET(v, i, x) (SCM_SIMPLE_VECTOR_SET (v, i, x)) |
| 59 | #define VECTOR_LENGTH(v) (SCM_SIMPLE_VECTOR_LENGTH (v)) |
| 60 | |
| 61 | SCM_SYMBOL (sym_case_lambda_star, "case-lambda*"); |
| 62 | |
| 63 | \f |
| 64 | |
| 65 | |
| 66 | /* Primitives not exposed to general Scheme. */ |
| 67 | static SCM wind; |
| 68 | static SCM unwind; |
| 69 | static SCM push_fluid; |
| 70 | static SCM pop_fluid; |
| 71 | |
| 72 | static SCM |
| 73 | do_wind (SCM in, SCM out) |
| 74 | { |
| 75 | scm_dynstack_push_dynwind (&SCM_I_CURRENT_THREAD->dynstack, in, out); |
| 76 | return SCM_UNSPECIFIED; |
| 77 | } |
| 78 | |
| 79 | static SCM |
| 80 | do_unwind (void) |
| 81 | { |
| 82 | scm_dynstack_pop (&SCM_I_CURRENT_THREAD->dynstack); |
| 83 | return SCM_UNSPECIFIED; |
| 84 | } |
| 85 | |
| 86 | static SCM |
| 87 | do_push_fluid (SCM fluid, SCM val) |
| 88 | { |
| 89 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
| 90 | scm_dynstack_push_fluid (&thread->dynstack, fluid, val, |
| 91 | thread->dynamic_state); |
| 92 | return SCM_UNSPECIFIED; |
| 93 | } |
| 94 | |
| 95 | static SCM |
| 96 | do_pop_fluid (void) |
| 97 | { |
| 98 | scm_i_thread *thread = SCM_I_CURRENT_THREAD; |
| 99 | scm_dynstack_unwind_fluid (&thread->dynstack, thread->dynamic_state); |
| 100 | return SCM_UNSPECIFIED; |
| 101 | } |
| 102 | |
| 103 | |
| 104 | \f |
| 105 | |
| 106 | /* {Evaluator memoized expressions} |
| 107 | */ |
| 108 | |
| 109 | scm_t_bits scm_tc16_memoized; |
| 110 | |
| 111 | #define MAKMEMO(n, args) \ |
| 112 | (scm_cons (SCM_I_MAKINUM (n), args)) |
| 113 | |
| 114 | #define MAKMEMO_SEQ(head,tail) \ |
| 115 | MAKMEMO (SCM_M_SEQ, scm_cons (head, tail)) |
| 116 | #define MAKMEMO_IF(test, then, else_) \ |
| 117 | MAKMEMO (SCM_M_IF, scm_cons (test, scm_cons (then, else_))) |
| 118 | #define FIXED_ARITY(nreq) \ |
| 119 | scm_list_1 (SCM_I_MAKINUM (nreq)) |
| 120 | #define REST_ARITY(nreq, rest) \ |
| 121 | scm_list_2 (SCM_I_MAKINUM (nreq), rest) |
| 122 | #define FULL_ARITY(nreq, rest, nopt, kw, inits, alt) \ |
| 123 | scm_list_n (SCM_I_MAKINUM (nreq), rest, SCM_I_MAKINUM (nopt), kw, inits, \ |
| 124 | alt, SCM_UNDEFINED) |
| 125 | #define MAKMEMO_LAMBDA(body, arity, meta) \ |
| 126 | MAKMEMO (SCM_M_LAMBDA, \ |
| 127 | scm_cons (body, scm_cons (meta, arity))) |
| 128 | #define MAKMEMO_LET(inits, body) \ |
| 129 | MAKMEMO (SCM_M_LET, scm_cons (inits, body)) |
| 130 | #define MAKMEMO_QUOTE(exp) \ |
| 131 | MAKMEMO (SCM_M_QUOTE, exp) |
| 132 | #define MAKMEMO_DEFINE(var, val) \ |
| 133 | MAKMEMO (SCM_M_DEFINE, scm_cons (var, val)) |
| 134 | #define MAKMEMO_CAPTURE_MODULE(exp) \ |
| 135 | MAKMEMO (SCM_M_CAPTURE_MODULE, exp) |
| 136 | #define MAKMEMO_APPLY(proc, args)\ |
| 137 | MAKMEMO (SCM_M_APPLY, scm_list_2 (proc, args)) |
| 138 | #define MAKMEMO_CONT(proc) \ |
| 139 | MAKMEMO (SCM_M_CONT, proc) |
| 140 | #define MAKMEMO_CALL_WITH_VALUES(prod, cons) \ |
| 141 | MAKMEMO (SCM_M_CALL_WITH_VALUES, scm_cons (prod, cons)) |
| 142 | #define MAKMEMO_CALL(proc, nargs, args) \ |
| 143 | MAKMEMO (SCM_M_CALL, scm_cons (proc, scm_cons (SCM_I_MAKINUM (nargs), args))) |
| 144 | #define MAKMEMO_LEX_REF(pos) \ |
| 145 | MAKMEMO (SCM_M_LEXICAL_REF, pos) |
| 146 | #define MAKMEMO_LEX_SET(pos, val) \ |
| 147 | MAKMEMO (SCM_M_LEXICAL_SET, scm_cons (pos, val)) |
| 148 | #define MAKMEMO_TOP_REF(var) \ |
| 149 | MAKMEMO (SCM_M_TOPLEVEL_REF, var) |
| 150 | #define MAKMEMO_TOP_SET(var, val) \ |
| 151 | MAKMEMO (SCM_M_TOPLEVEL_SET, scm_cons (var, val)) |
| 152 | #define MAKMEMO_MOD_REF(mod, var, public) \ |
| 153 | MAKMEMO (SCM_M_MODULE_REF, scm_cons (mod, scm_cons (var, public))) |
| 154 | #define MAKMEMO_MOD_SET(val, mod, var, public) \ |
| 155 | MAKMEMO (SCM_M_MODULE_SET, scm_cons (val, scm_cons (mod, scm_cons (var, public)))) |
| 156 | #define MAKMEMO_CALL_WITH_PROMPT(tag, thunk, handler) \ |
| 157 | MAKMEMO (SCM_M_CALL_WITH_PROMPT, scm_cons (tag, scm_cons (thunk, handler))) |
| 158 | |
| 159 | |
| 160 | \f |
| 161 | |
| 162 | /* This table must agree with the list of M_ constants in memoize.h */ |
| 163 | static const char *const memoized_tags[] = |
| 164 | { |
| 165 | "seq", |
| 166 | "if", |
| 167 | "lambda", |
| 168 | "let", |
| 169 | "quote", |
| 170 | "define", |
| 171 | "capture-module", |
| 172 | "apply", |
| 173 | "call/cc", |
| 174 | "call-with-values", |
| 175 | "call", |
| 176 | "lexical-ref", |
| 177 | "lexical-set!", |
| 178 | "toplevel-ref", |
| 179 | "toplevel-set!", |
| 180 | "module-ref", |
| 181 | "module-set!", |
| 182 | "call-with-prompt", |
| 183 | }; |
| 184 | |
| 185 | |
| 186 | \f |
| 187 | |
| 188 | |
| 189 | static int |
| 190 | try_lookup_rib (SCM x, SCM rib) |
| 191 | { |
| 192 | int idx = 0; |
| 193 | for (; idx < VECTOR_LENGTH (rib); idx++) |
| 194 | if (scm_is_eq (x, VECTOR_REF (rib, idx))) |
| 195 | return idx; /* bound */ |
| 196 | return -1; |
| 197 | } |
| 198 | |
| 199 | static int |
| 200 | lookup_rib (SCM x, SCM rib) |
| 201 | { |
| 202 | int idx = try_lookup_rib (x, rib); |
| 203 | if (idx < 0) |
| 204 | abort (); |
| 205 | return idx; |
| 206 | } |
| 207 | |
| 208 | static SCM |
| 209 | make_pos (int depth, int width) |
| 210 | { |
| 211 | return scm_cons (SCM_I_MAKINUM (depth), SCM_I_MAKINUM (width)); |
| 212 | } |
| 213 | |
| 214 | static SCM |
| 215 | lookup (SCM x, SCM env) |
| 216 | { |
| 217 | int d = 0; |
| 218 | for (; scm_is_pair (env); env = CDR (env), d++) |
| 219 | { |
| 220 | int w = try_lookup_rib (x, CAR (env)); |
| 221 | if (w < 0) |
| 222 | continue; |
| 223 | return make_pos (d, w); |
| 224 | } |
| 225 | abort (); |
| 226 | } |
| 227 | |
| 228 | /* Abbreviate SCM_EXPANDED_REF. Copied because I'm not sure about symbol pasting */ |
| 229 | #define REF(x,type,field) \ |
| 230 | (scm_struct_ref (x, SCM_I_MAKINUM (SCM_EXPANDED_##type##_##field))) |
| 231 | |
| 232 | static SCM list_of_guile = SCM_BOOL_F; |
| 233 | |
| 234 | static SCM memoize (SCM exp, SCM env); |
| 235 | |
| 236 | static SCM |
| 237 | memoize_exps (SCM exps, SCM env) |
| 238 | { |
| 239 | SCM ret; |
| 240 | for (ret = SCM_EOL; scm_is_pair (exps); exps = CDR (exps)) |
| 241 | ret = scm_cons (memoize (CAR (exps), env), ret); |
| 242 | return scm_reverse_x (ret, SCM_UNDEFINED); |
| 243 | } |
| 244 | |
| 245 | static SCM |
| 246 | capture_env (SCM env) |
| 247 | { |
| 248 | if (scm_is_false (env)) |
| 249 | return SCM_BOOL_T; |
| 250 | return env; |
| 251 | } |
| 252 | |
| 253 | static SCM |
| 254 | maybe_makmemo_capture_module (SCM exp, SCM env) |
| 255 | { |
| 256 | if (scm_is_false (env)) |
| 257 | return MAKMEMO_CAPTURE_MODULE (exp); |
| 258 | return exp; |
| 259 | } |
| 260 | |
| 261 | static SCM |
| 262 | memoize (SCM exp, SCM env) |
| 263 | { |
| 264 | if (!SCM_EXPANDED_P (exp)) |
| 265 | abort (); |
| 266 | |
| 267 | switch (SCM_EXPANDED_TYPE (exp)) |
| 268 | { |
| 269 | case SCM_EXPANDED_VOID: |
| 270 | return MAKMEMO_QUOTE (SCM_UNSPECIFIED); |
| 271 | |
| 272 | case SCM_EXPANDED_CONST: |
| 273 | return MAKMEMO_QUOTE (REF (exp, CONST, EXP)); |
| 274 | |
| 275 | case SCM_EXPANDED_PRIMITIVE_REF: |
| 276 | if (scm_is_eq (scm_current_module (), scm_the_root_module ())) |
| 277 | return maybe_makmemo_capture_module |
| 278 | (MAKMEMO_TOP_REF (REF (exp, PRIMITIVE_REF, NAME)), |
| 279 | env); |
| 280 | else |
| 281 | return MAKMEMO_MOD_REF (list_of_guile, REF (exp, PRIMITIVE_REF, NAME), |
| 282 | SCM_BOOL_F); |
| 283 | |
| 284 | case SCM_EXPANDED_LEXICAL_REF: |
| 285 | return MAKMEMO_LEX_REF (lookup (REF (exp, LEXICAL_REF, GENSYM), env)); |
| 286 | |
| 287 | case SCM_EXPANDED_LEXICAL_SET: |
| 288 | return MAKMEMO_LEX_SET (lookup (REF (exp, LEXICAL_SET, GENSYM), env), |
| 289 | memoize (REF (exp, LEXICAL_SET, EXP), env)); |
| 290 | |
| 291 | case SCM_EXPANDED_MODULE_REF: |
| 292 | return MAKMEMO_MOD_REF (REF (exp, MODULE_REF, MOD), |
| 293 | REF (exp, MODULE_REF, NAME), |
| 294 | REF (exp, MODULE_REF, PUBLIC)); |
| 295 | |
| 296 | case SCM_EXPANDED_MODULE_SET: |
| 297 | return MAKMEMO_MOD_SET (memoize (REF (exp, MODULE_SET, EXP), env), |
| 298 | REF (exp, MODULE_SET, MOD), |
| 299 | REF (exp, MODULE_SET, NAME), |
| 300 | REF (exp, MODULE_SET, PUBLIC)); |
| 301 | |
| 302 | case SCM_EXPANDED_TOPLEVEL_REF: |
| 303 | return maybe_makmemo_capture_module |
| 304 | (MAKMEMO_TOP_REF (REF (exp, TOPLEVEL_REF, NAME)), env); |
| 305 | |
| 306 | case SCM_EXPANDED_TOPLEVEL_SET: |
| 307 | return maybe_makmemo_capture_module |
| 308 | (MAKMEMO_TOP_SET (REF (exp, TOPLEVEL_SET, NAME), |
| 309 | memoize (REF (exp, TOPLEVEL_SET, EXP), |
| 310 | capture_env (env))), |
| 311 | env); |
| 312 | |
| 313 | case SCM_EXPANDED_TOPLEVEL_DEFINE: |
| 314 | return MAKMEMO_DEFINE (REF (exp, TOPLEVEL_DEFINE, NAME), |
| 315 | memoize (REF (exp, TOPLEVEL_DEFINE, EXP), env)); |
| 316 | |
| 317 | case SCM_EXPANDED_CONDITIONAL: |
| 318 | return MAKMEMO_IF (memoize (REF (exp, CONDITIONAL, TEST), env), |
| 319 | memoize (REF (exp, CONDITIONAL, CONSEQUENT), env), |
| 320 | memoize (REF (exp, CONDITIONAL, ALTERNATE), env)); |
| 321 | |
| 322 | case SCM_EXPANDED_CALL: |
| 323 | { |
| 324 | SCM proc, args; |
| 325 | |
| 326 | proc = REF (exp, CALL, PROC); |
| 327 | args = memoize_exps (REF (exp, CALL, ARGS), env); |
| 328 | |
| 329 | return MAKMEMO_CALL (memoize (proc, env), scm_ilength (args), args); |
| 330 | } |
| 331 | |
| 332 | case SCM_EXPANDED_PRIMCALL: |
| 333 | { |
| 334 | SCM name, args; |
| 335 | int nargs; |
| 336 | |
| 337 | name = REF (exp, PRIMCALL, NAME); |
| 338 | args = memoize_exps (REF (exp, PRIMCALL, ARGS), env); |
| 339 | nargs = scm_ilength (args); |
| 340 | |
| 341 | if (nargs == 3 |
| 342 | && scm_is_eq (name, scm_from_latin1_symbol ("call-with-prompt"))) |
| 343 | return MAKMEMO_CALL_WITH_PROMPT (CAR (args), |
| 344 | CADR (args), |
| 345 | CADDR (args)); |
| 346 | else if (nargs == 2 |
| 347 | && scm_is_eq (name, scm_from_latin1_symbol ("apply"))) |
| 348 | return MAKMEMO_APPLY (CAR (args), CADR (args)); |
| 349 | else if (nargs == 1 |
| 350 | && scm_is_eq (name, |
| 351 | scm_from_latin1_symbol |
| 352 | ("call-with-current-continuation"))) |
| 353 | return MAKMEMO_CONT (CAR (args)); |
| 354 | else if (nargs == 2 |
| 355 | && scm_is_eq (name, |
| 356 | scm_from_latin1_symbol ("call-with-values"))) |
| 357 | return MAKMEMO_CALL_WITH_VALUES (CAR (args), CADR (args)); |
| 358 | else if (nargs == 2 |
| 359 | && scm_is_eq (name, scm_from_latin1_symbol ("wind"))) |
| 360 | return MAKMEMO_CALL (MAKMEMO_QUOTE (wind), 2, args); |
| 361 | else if (nargs == 0 |
| 362 | && scm_is_eq (name, scm_from_latin1_symbol ("unwind"))) |
| 363 | return MAKMEMO_CALL (MAKMEMO_QUOTE (unwind), 0, SCM_EOL); |
| 364 | else if (nargs == 2 |
| 365 | && scm_is_eq (name, scm_from_latin1_symbol ("push-fluid"))) |
| 366 | return MAKMEMO_CALL (MAKMEMO_QUOTE (push_fluid), 2, args); |
| 367 | else if (nargs == 0 |
| 368 | && scm_is_eq (name, scm_from_latin1_symbol ("pop-fluid"))) |
| 369 | return MAKMEMO_CALL (MAKMEMO_QUOTE (pop_fluid), 0, SCM_EOL); |
| 370 | else if (scm_is_eq (scm_current_module (), scm_the_root_module ())) |
| 371 | return MAKMEMO_CALL (maybe_makmemo_capture_module |
| 372 | (MAKMEMO_TOP_REF (name), env), |
| 373 | nargs, args); |
| 374 | else |
| 375 | return MAKMEMO_CALL (MAKMEMO_MOD_REF (list_of_guile, name, |
| 376 | SCM_BOOL_F), |
| 377 | nargs, |
| 378 | args); |
| 379 | } |
| 380 | |
| 381 | case SCM_EXPANDED_SEQ: |
| 382 | return MAKMEMO_SEQ (memoize (REF (exp, SEQ, HEAD), env), |
| 383 | memoize (REF (exp, SEQ, TAIL), env)); |
| 384 | |
| 385 | case SCM_EXPANDED_LAMBDA: |
| 386 | /* The body will be a lambda-case or #f. */ |
| 387 | { |
| 388 | SCM meta, body, proc; |
| 389 | |
| 390 | meta = REF (exp, LAMBDA, META); |
| 391 | |
| 392 | body = REF (exp, LAMBDA, BODY); |
| 393 | if (scm_is_false (body)) |
| 394 | /* Give a body to case-lambda with no clauses. */ |
| 395 | proc = MAKMEMO_LAMBDA |
| 396 | (MAKMEMO_CALL |
| 397 | (MAKMEMO_MOD_REF (list_of_guile, |
| 398 | scm_from_latin1_symbol ("throw"), |
| 399 | SCM_BOOL_F), |
| 400 | 5, |
| 401 | scm_list_5 (MAKMEMO_QUOTE (scm_args_number_key), |
| 402 | MAKMEMO_QUOTE (SCM_BOOL_F), |
| 403 | MAKMEMO_QUOTE (scm_from_latin1_string |
| 404 | ("Wrong number of arguments")), |
| 405 | MAKMEMO_QUOTE (SCM_EOL), |
| 406 | MAKMEMO_QUOTE (SCM_BOOL_F))), |
| 407 | FIXED_ARITY (0), |
| 408 | meta); |
| 409 | else |
| 410 | { |
| 411 | proc = memoize (body, capture_env (env)); |
| 412 | SCM_SETCAR (SCM_CDR (SCM_MEMOIZED_ARGS (proc)), meta); |
| 413 | } |
| 414 | |
| 415 | return maybe_makmemo_capture_module (proc, env); |
| 416 | } |
| 417 | |
| 418 | case SCM_EXPANDED_LAMBDA_CASE: |
| 419 | { |
| 420 | SCM req, rest, opt, kw, inits, vars, body, alt; |
| 421 | SCM walk, minits, arity, rib, new_env; |
| 422 | int nreq, nopt; |
| 423 | |
| 424 | req = REF (exp, LAMBDA_CASE, REQ); |
| 425 | rest = scm_not (scm_not (REF (exp, LAMBDA_CASE, REST))); |
| 426 | opt = REF (exp, LAMBDA_CASE, OPT); |
| 427 | kw = REF (exp, LAMBDA_CASE, KW); |
| 428 | inits = REF (exp, LAMBDA_CASE, INITS); |
| 429 | vars = REF (exp, LAMBDA_CASE, GENSYMS); |
| 430 | body = REF (exp, LAMBDA_CASE, BODY); |
| 431 | alt = REF (exp, LAMBDA_CASE, ALTERNATE); |
| 432 | |
| 433 | nreq = scm_ilength (req); |
| 434 | nopt = scm_is_pair (opt) ? scm_ilength (opt) : 0; |
| 435 | |
| 436 | /* The vars are the gensyms, according to the divine plan. But we need |
| 437 | to memoize the inits within their appropriate environment, |
| 438 | complicating things. */ |
| 439 | rib = scm_vector (vars); |
| 440 | new_env = scm_cons (rib, env); |
| 441 | |
| 442 | minits = SCM_EOL; |
| 443 | for (walk = inits; scm_is_pair (walk); walk = CDR (walk)) |
| 444 | minits = scm_cons (memoize (CAR (walk), new_env), minits); |
| 445 | minits = scm_reverse_x (minits, SCM_UNDEFINED); |
| 446 | |
| 447 | if (scm_is_true (kw)) |
| 448 | { |
| 449 | /* (aok? (kw name sym) ...) -> (aok? (kw . index) ...) */ |
| 450 | SCM aok = CAR (kw), indices = SCM_EOL; |
| 451 | for (kw = CDR (kw); scm_is_pair (kw); kw = CDR (kw)) |
| 452 | { |
| 453 | SCM k; |
| 454 | int idx; |
| 455 | |
| 456 | k = CAR (CAR (kw)); |
| 457 | idx = lookup_rib (CADDR (CAR (kw)), rib); |
| 458 | indices = scm_acons (k, SCM_I_MAKINUM (idx), indices); |
| 459 | } |
| 460 | kw = scm_cons (aok, scm_reverse_x (indices, SCM_UNDEFINED)); |
| 461 | } |
| 462 | |
| 463 | if (scm_is_false (alt) && scm_is_false (kw) && scm_is_false (opt)) |
| 464 | { |
| 465 | if (scm_is_false (rest)) |
| 466 | arity = FIXED_ARITY (nreq); |
| 467 | else |
| 468 | arity = REST_ARITY (nreq, SCM_BOOL_T); |
| 469 | } |
| 470 | else if (scm_is_true (alt)) |
| 471 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, |
| 472 | SCM_MEMOIZED_ARGS (memoize (alt, env))); |
| 473 | else |
| 474 | arity = FULL_ARITY (nreq, rest, nopt, kw, minits, SCM_BOOL_F); |
| 475 | |
| 476 | return MAKMEMO_LAMBDA (memoize (body, new_env), arity, |
| 477 | SCM_BOOL_F /* meta, filled in later */); |
| 478 | } |
| 479 | |
| 480 | case SCM_EXPANDED_LET: |
| 481 | { |
| 482 | SCM vars, exps, body, varsv, inits, new_env; |
| 483 | int i; |
| 484 | |
| 485 | vars = REF (exp, LET, GENSYMS); |
| 486 | exps = REF (exp, LET, VALS); |
| 487 | body = REF (exp, LET, BODY); |
| 488 | |
| 489 | varsv = scm_vector (vars); |
| 490 | inits = scm_c_make_vector (VECTOR_LENGTH (varsv), |
| 491 | SCM_BOOL_F); |
| 492 | new_env = scm_cons (varsv, capture_env (env)); |
| 493 | for (i = 0; scm_is_pair (exps); exps = CDR (exps), i++) |
| 494 | VECTOR_SET (inits, i, memoize (CAR (exps), env)); |
| 495 | |
| 496 | return maybe_makmemo_capture_module |
| 497 | (MAKMEMO_LET (inits, memoize (body, new_env)), env); |
| 498 | } |
| 499 | |
| 500 | case SCM_EXPANDED_LETREC: |
| 501 | { |
| 502 | SCM vars, varsv, exps, expsv, body, undefs, new_env; |
| 503 | int i, nvars, in_order_p; |
| 504 | |
| 505 | vars = REF (exp, LETREC, GENSYMS); |
| 506 | exps = REF (exp, LETREC, VALS); |
| 507 | body = REF (exp, LETREC, BODY); |
| 508 | in_order_p = scm_is_true (REF (exp, LETREC, IN_ORDER_P)); |
| 509 | |
| 510 | varsv = scm_vector (vars); |
| 511 | nvars = VECTOR_LENGTH (varsv); |
| 512 | expsv = scm_vector (exps); |
| 513 | |
| 514 | undefs = scm_c_make_vector (nvars, MAKMEMO_QUOTE (SCM_UNDEFINED)); |
| 515 | new_env = scm_cons (varsv, capture_env (env)); |
| 516 | |
| 517 | if (in_order_p) |
| 518 | { |
| 519 | SCM body_exps = memoize (body, new_env); |
| 520 | for (i = nvars - 1; i >= 0; i--) |
| 521 | { |
| 522 | SCM init = memoize (VECTOR_REF (expsv, i), new_env); |
| 523 | body_exps = MAKMEMO_SEQ (MAKMEMO_LEX_SET (make_pos (0, i), init), |
| 524 | body_exps); |
| 525 | } |
| 526 | return maybe_makmemo_capture_module |
| 527 | (MAKMEMO_LET (undefs, body_exps), env); |
| 528 | } |
| 529 | else |
| 530 | { |
| 531 | SCM sets = SCM_BOOL_F, inits = scm_c_make_vector (nvars, SCM_BOOL_F); |
| 532 | for (i = nvars - 1; i >= 0; i--) |
| 533 | { |
| 534 | SCM init, set; |
| 535 | |
| 536 | init = memoize (VECTOR_REF (expsv, i), new_env); |
| 537 | VECTOR_SET (inits, i, init); |
| 538 | |
| 539 | set = MAKMEMO_LEX_SET (make_pos (1, i), |
| 540 | MAKMEMO_LEX_REF (make_pos (0, i))); |
| 541 | if (scm_is_false (sets)) |
| 542 | sets = set; |
| 543 | else |
| 544 | sets = MAKMEMO_SEQ (set, sets); |
| 545 | } |
| 546 | |
| 547 | if (scm_is_false (sets)) |
| 548 | return memoize (body, env); |
| 549 | |
| 550 | return maybe_makmemo_capture_module |
| 551 | (MAKMEMO_LET (undefs, |
| 552 | MAKMEMO_SEQ (MAKMEMO_LET (inits, sets), |
| 553 | memoize (body, new_env))), |
| 554 | env); |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | default: |
| 559 | abort (); |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | |
| 564 | \f |
| 565 | |
| 566 | SCM_DEFINE (scm_memoize_expression, "memoize-expression", 1, 0, 0, |
| 567 | (SCM exp), |
| 568 | "Memoize the expression @var{exp}.") |
| 569 | #define FUNC_NAME s_scm_memoize_expression |
| 570 | { |
| 571 | SCM_ASSERT_TYPE (SCM_EXPANDED_P (exp), exp, 1, FUNC_NAME, "expanded"); |
| 572 | return memoize (exp, SCM_BOOL_F); |
| 573 | } |
| 574 | #undef FUNC_NAME |
| 575 | |
| 576 | |
| 577 | \f |
| 578 | |
| 579 | SCM_SYMBOL (sym_placeholder, "_"); |
| 580 | |
| 581 | static SCM unmemoize (SCM expr); |
| 582 | |
| 583 | static SCM |
| 584 | unmemoize_exprs (SCM exprs) |
| 585 | { |
| 586 | SCM ret, tail; |
| 587 | if (scm_is_null (exprs)) |
| 588 | return SCM_EOL; |
| 589 | ret = scm_list_1 (unmemoize (CAR (exprs))); |
| 590 | tail = ret; |
| 591 | for (exprs = CDR (exprs); !scm_is_null (exprs); exprs = CDR (exprs)) |
| 592 | { |
| 593 | SCM_SETCDR (tail, scm_list_1 (unmemoize (CAR (exprs)))); |
| 594 | tail = CDR (tail); |
| 595 | } |
| 596 | return ret; |
| 597 | } |
| 598 | |
| 599 | static SCM |
| 600 | unmemoize_bindings (SCM inits) |
| 601 | { |
| 602 | SCM ret = SCM_EOL; |
| 603 | int n = scm_c_vector_length (inits); |
| 604 | |
| 605 | while (n--) |
| 606 | ret = scm_cons (unmemoize (scm_c_vector_ref (inits, n)), ret); |
| 607 | |
| 608 | return ret; |
| 609 | } |
| 610 | |
| 611 | static SCM |
| 612 | unmemoize_lexical (SCM n) |
| 613 | { |
| 614 | char buf[32]; |
| 615 | buf[31] = 0; |
| 616 | snprintf (buf, 31, "<%u,%u>", scm_to_uint32 (CAR (n)), |
| 617 | scm_to_uint32 (CDR (n))); |
| 618 | return scm_from_utf8_symbol (buf); |
| 619 | } |
| 620 | |
| 621 | static SCM |
| 622 | unmemoize (const SCM expr) |
| 623 | { |
| 624 | SCM args; |
| 625 | |
| 626 | args = SCM_MEMOIZED_ARGS (expr); |
| 627 | switch (SCM_MEMOIZED_TAG (expr)) |
| 628 | { |
| 629 | case SCM_M_APPLY: |
| 630 | return scm_cons (scm_from_latin1_symbol ("apply"), |
| 631 | unmemoize_exprs (args)); |
| 632 | case SCM_M_SEQ: |
| 633 | return scm_list_3 (scm_sym_begin, unmemoize (CAR (args)), |
| 634 | unmemoize (CDR (args))); |
| 635 | case SCM_M_CALL: |
| 636 | return scm_cons (unmemoize (CAR (args)), unmemoize_exprs (CDDR (args))); |
| 637 | case SCM_M_CONT: |
| 638 | return scm_list_2 (scm_from_latin1_symbol |
| 639 | ("call-with-current_continuation"), |
| 640 | unmemoize (args)); |
| 641 | case SCM_M_CALL_WITH_VALUES: |
| 642 | return scm_list_3 (scm_from_latin1_symbol ("call-with-values"), |
| 643 | unmemoize (CAR (args)), unmemoize (CDR (args))); |
| 644 | case SCM_M_DEFINE: |
| 645 | return scm_list_3 (scm_sym_define, CAR (args), unmemoize (CDR (args))); |
| 646 | case SCM_M_CAPTURE_MODULE: |
| 647 | return scm_list_2 (scm_from_latin1_symbol ("capture-module"), |
| 648 | unmemoize (args)); |
| 649 | case SCM_M_IF: |
| 650 | return scm_list_4 (scm_sym_if, unmemoize (scm_car (args)), |
| 651 | unmemoize (scm_cadr (args)), unmemoize (scm_cddr (args))); |
| 652 | case SCM_M_LAMBDA: |
| 653 | { |
| 654 | SCM body = CAR (args), spec = CDDR (args); |
| 655 | |
| 656 | if (scm_is_null (CDR (spec))) |
| 657 | return scm_list_3 (scm_sym_lambda, |
| 658 | scm_make_list (CAR (spec), sym_placeholder), |
| 659 | unmemoize (CAR (args))); |
| 660 | else if (scm_is_null (SCM_CDDR (spec))) |
| 661 | { |
| 662 | SCM formals = scm_make_list (CAR (spec), sym_placeholder); |
| 663 | return scm_list_3 (scm_sym_lambda, |
| 664 | scm_is_true (CADR (spec)) |
| 665 | ? scm_cons_star (sym_placeholder, formals) |
| 666 | : formals, |
| 667 | unmemoize (CAR (args))); |
| 668 | } |
| 669 | else |
| 670 | { |
| 671 | SCM alt, tail; |
| 672 | |
| 673 | alt = CADDR (CDDDR (spec)); |
| 674 | if (scm_is_true (alt)) |
| 675 | tail = CDR (unmemoize (alt)); |
| 676 | else |
| 677 | tail = SCM_EOL; |
| 678 | |
| 679 | return scm_cons |
| 680 | (sym_case_lambda_star, |
| 681 | scm_cons (scm_list_2 (scm_list_5 (CAR (spec), |
| 682 | CADR (spec), |
| 683 | CADDR (spec), |
| 684 | CADDDR (spec), |
| 685 | unmemoize_exprs (CADR (CDDDR (spec)))), |
| 686 | unmemoize (body)), |
| 687 | tail)); |
| 688 | } |
| 689 | } |
| 690 | case SCM_M_LET: |
| 691 | return scm_list_3 (scm_sym_let, |
| 692 | unmemoize_bindings (CAR (args)), |
| 693 | unmemoize (CDR (args))); |
| 694 | case SCM_M_QUOTE: |
| 695 | return scm_list_2 (scm_sym_quote, args); |
| 696 | case SCM_M_LEXICAL_REF: |
| 697 | return unmemoize_lexical (args); |
| 698 | case SCM_M_LEXICAL_SET: |
| 699 | return scm_list_3 (scm_sym_set_x, unmemoize_lexical (CAR (args)), |
| 700 | unmemoize (CDR (args))); |
| 701 | case SCM_M_TOPLEVEL_REF: |
| 702 | return args; |
| 703 | case SCM_M_TOPLEVEL_SET: |
| 704 | return scm_list_3 (scm_sym_set_x, CAR (args), unmemoize (CDR (args))); |
| 705 | case SCM_M_MODULE_REF: |
| 706 | return SCM_VARIABLEP (args) ? args |
| 707 | : scm_list_3 (scm_is_true (CDDR (args)) ? scm_sym_at : scm_sym_atat, |
| 708 | scm_i_finite_list_copy (CAR (args)), |
| 709 | CADR (args)); |
| 710 | case SCM_M_MODULE_SET: |
| 711 | return scm_list_3 (scm_sym_set_x, |
| 712 | SCM_VARIABLEP (CDR (args)) ? CDR (args) |
| 713 | : scm_list_3 (scm_is_true (CDDDR (args)) |
| 714 | ? scm_sym_at : scm_sym_atat, |
| 715 | scm_i_finite_list_copy (CADR (args)), |
| 716 | CADDR (args)), |
| 717 | unmemoize (CAR (args))); |
| 718 | case SCM_M_CALL_WITH_PROMPT: |
| 719 | return scm_list_4 (scm_from_latin1_symbol ("call-with-prompt"), |
| 720 | unmemoize (CAR (args)), |
| 721 | unmemoize (CADR (args)), |
| 722 | unmemoize (CDDR (args))); |
| 723 | default: |
| 724 | abort (); |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | |
| 729 | \f |
| 730 | |
| 731 | SCM_DEFINE (scm_unmemoize_expression, "unmemoize-expression", 1, 0, 0, |
| 732 | (SCM m), |
| 733 | "Unmemoize the memoized expression @var{m}.") |
| 734 | #define FUNC_NAME s_scm_unmemoize_expression |
| 735 | { |
| 736 | return unmemoize (m); |
| 737 | } |
| 738 | #undef FUNC_NAME |
| 739 | |
| 740 | SCM_DEFINE (scm_memoized_typecode, "memoized-typecode", 1, 0, 0, |
| 741 | (SCM sym), |
| 742 | "Return the memoized typecode corresponding to the symbol @var{sym}.") |
| 743 | #define FUNC_NAME s_scm_memoized_typecode |
| 744 | { |
| 745 | int i; |
| 746 | |
| 747 | SCM_VALIDATE_SYMBOL (1, sym); |
| 748 | |
| 749 | for (i = 0; i < sizeof(memoized_tags)/sizeof(const char*); i++) |
| 750 | if (strcmp (scm_i_symbol_chars (sym), memoized_tags[i]) == 0) |
| 751 | return scm_from_int32 (i); |
| 752 | |
| 753 | return SCM_BOOL_F; |
| 754 | } |
| 755 | #undef FUNC_NAME |
| 756 | |
| 757 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); |
| 758 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; |
| 759 | static void error_unbound_variable (SCM symbol) |
| 760 | { |
| 761 | scm_error (scm_unbound_variable_key, NULL, "Unbound variable: ~S", |
| 762 | scm_list_1 (symbol), SCM_BOOL_F); |
| 763 | } |
| 764 | |
| 765 | SCM_DEFINE (scm_memoize_variable_access_x, "memoize-variable-access!", 2, 0, 0, |
| 766 | (SCM m, SCM mod), |
| 767 | "Look up and cache the variable that @var{m} will access, returning the variable.") |
| 768 | #define FUNC_NAME s_scm_memoize_variable_access_x |
| 769 | { |
| 770 | SCM mx = SCM_MEMOIZED_ARGS (m); |
| 771 | |
| 772 | if (scm_is_false (mod)) |
| 773 | mod = scm_the_root_module (); |
| 774 | |
| 775 | switch (SCM_MEMOIZED_TAG (m)) |
| 776 | { |
| 777 | case SCM_M_TOPLEVEL_REF: |
| 778 | if (SCM_VARIABLEP (mx)) |
| 779 | return mx; |
| 780 | else |
| 781 | { |
| 782 | SCM var = scm_module_variable (mod, mx); |
| 783 | if (scm_is_false (var) || scm_is_false (scm_variable_bound_p (var))) |
| 784 | error_unbound_variable (mx); |
| 785 | SCM_SETCDR (m, var); |
| 786 | return var; |
| 787 | } |
| 788 | |
| 789 | case SCM_M_TOPLEVEL_SET: |
| 790 | { |
| 791 | SCM var = CAR (mx); |
| 792 | if (SCM_VARIABLEP (var)) |
| 793 | return var; |
| 794 | else |
| 795 | { |
| 796 | var = scm_module_variable (mod, var); |
| 797 | if (scm_is_false (var)) |
| 798 | error_unbound_variable (CAR (mx)); |
| 799 | SCM_SETCAR (mx, var); |
| 800 | return var; |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | case SCM_M_MODULE_REF: |
| 805 | if (SCM_VARIABLEP (mx)) |
| 806 | return mx; |
| 807 | else |
| 808 | { |
| 809 | SCM var; |
| 810 | mod = scm_resolve_module (CAR (mx)); |
| 811 | if (scm_is_true (CDDR (mx))) |
| 812 | mod = scm_module_public_interface (mod); |
| 813 | var = scm_module_lookup (mod, CADR (mx)); |
| 814 | if (scm_is_false (scm_variable_bound_p (var))) |
| 815 | error_unbound_variable (CADR (mx)); |
| 816 | SCM_SETCDR (m, var); |
| 817 | return var; |
| 818 | } |
| 819 | |
| 820 | case SCM_M_MODULE_SET: |
| 821 | /* FIXME: not quite threadsafe */ |
| 822 | if (SCM_VARIABLEP (CDR (mx))) |
| 823 | return CDR (mx); |
| 824 | else |
| 825 | { |
| 826 | SCM var; |
| 827 | mod = scm_resolve_module (CADR (mx)); |
| 828 | if (scm_is_true (CDDDR (mx))) |
| 829 | mod = scm_module_public_interface (mod); |
| 830 | var = scm_module_lookup (mod, CADDR (mx)); |
| 831 | SCM_SETCDR (mx, var); |
| 832 | return var; |
| 833 | } |
| 834 | |
| 835 | default: |
| 836 | scm_wrong_type_arg (FUNC_NAME, 1, m); |
| 837 | return SCM_BOOL_F; |
| 838 | } |
| 839 | } |
| 840 | #undef FUNC_NAME |
| 841 | |
| 842 | |
| 843 | \f |
| 844 | |
| 845 | void |
| 846 | scm_init_memoize () |
| 847 | { |
| 848 | #include "libguile/memoize.x" |
| 849 | |
| 850 | wind = scm_c_make_gsubr ("wind", 2, 0, 0, do_wind); |
| 851 | unwind = scm_c_make_gsubr ("unwind", 0, 0, 0, do_unwind); |
| 852 | push_fluid = scm_c_make_gsubr ("push-fluid", 2, 0, 0, do_push_fluid); |
| 853 | pop_fluid = scm_c_make_gsubr ("pop-fluid", 0, 0, 0, do_pop_fluid); |
| 854 | |
| 855 | list_of_guile = scm_list_1 (scm_from_latin1_symbol ("guile")); |
| 856 | } |
| 857 | |
| 858 | /* |
| 859 | Local Variables: |
| 860 | c-file-style: "gnu" |
| 861 | End: |
| 862 | */ |