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.
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.
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.
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
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"
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)
58 SCM_SYMBOL (sym_case_lambda_star
, "case-lambda*");
63 /* Primitives not exposed to general Scheme. */
68 do_wind (SCM in
, SCM out
)
70 scm_dynstack_push_dynwind (&SCM_I_CURRENT_THREAD
->dynstack
, in
, out
);
71 return SCM_UNSPECIFIED
;
77 scm_dynstack_pop (&SCM_I_CURRENT_THREAD
->dynstack
);
78 return SCM_UNSPECIFIED
;
84 /* {Evaluator memoized expressions}
87 scm_t_bits scm_tc16_memoized
;
89 #define MAKMEMO(n, args) \
90 (scm_cell (scm_tc16_memoized | ((n) << 16), SCM_UNPACK (args)))
92 #define MAKMEMO_SEQ(head,tail) \
93 MAKMEMO (SCM_M_SEQ, scm_cons (head, tail))
94 #define MAKMEMO_IF(test, then, else_) \
95 MAKMEMO (SCM_M_IF, scm_cons (test, scm_cons (then, else_)))
96 #define FIXED_ARITY(nreq) \
97 scm_list_1 (SCM_I_MAKINUM (nreq))
98 #define REST_ARITY(nreq, rest) \
99 scm_list_2 (SCM_I_MAKINUM (nreq), rest)
100 #define FULL_ARITY(nreq, rest, nopt, kw, inits, alt) \
101 scm_list_n (SCM_I_MAKINUM (nreq), rest, SCM_I_MAKINUM (nopt), kw, inits, \
103 #define MAKMEMO_LAMBDA(body, arity, docstring) \
104 MAKMEMO (SCM_M_LAMBDA, \
105 scm_cons (body, scm_cons (docstring, arity)))
106 #define MAKMEMO_LET(inits, body) \
107 MAKMEMO (SCM_M_LET, scm_cons (inits, body))
108 #define MAKMEMO_QUOTE(exp) \
109 MAKMEMO (SCM_M_QUOTE, exp)
110 #define MAKMEMO_DEFINE(var, val) \
111 MAKMEMO (SCM_M_DEFINE, scm_cons (var, val))
112 #define MAKMEMO_WITH_FLUIDS(fluids, vals, expr) \
113 MAKMEMO (SCM_M_WITH_FLUIDS, scm_cons (fluids, scm_cons (vals, expr)))
114 #define MAKMEMO_APPLY(proc, args)\
115 MAKMEMO (SCM_M_APPLY, scm_list_2 (proc, args))
116 #define MAKMEMO_CONT(proc) \
117 MAKMEMO (SCM_M_CONT, proc)
118 #define MAKMEMO_CALL_WITH_VALUES(prod, cons) \
119 MAKMEMO (SCM_M_CALL_WITH_VALUES, scm_cons (prod, cons))
120 #define MAKMEMO_CALL(proc, nargs, args) \
121 MAKMEMO (SCM_M_CALL, scm_cons (proc, scm_cons (SCM_I_MAKINUM (nargs), args)))
122 #define MAKMEMO_LEX_REF(n) \
123 MAKMEMO (SCM_M_LEXICAL_REF, SCM_I_MAKINUM (n))
124 #define MAKMEMO_LEX_SET(n, val) \
125 MAKMEMO (SCM_M_LEXICAL_SET, scm_cons (SCM_I_MAKINUM (n), val))
126 #define MAKMEMO_TOP_REF(var) \
127 MAKMEMO (SCM_M_TOPLEVEL_REF, var)
128 #define MAKMEMO_TOP_SET(var, val) \
129 MAKMEMO (SCM_M_TOPLEVEL_SET, scm_cons (var, val))
130 #define MAKMEMO_MOD_REF(mod, var, public) \
131 MAKMEMO (SCM_M_MODULE_REF, scm_cons (mod, scm_cons (var, public)))
132 #define MAKMEMO_MOD_SET(val, mod, var, public) \
133 MAKMEMO (SCM_M_MODULE_SET, scm_cons (val, scm_cons (mod, scm_cons (var, public))))
134 #define MAKMEMO_CALL_WITH_PROMPT(tag, thunk, handler) \
135 MAKMEMO (SCM_M_CALL_WITH_PROMPT, scm_cons (tag, scm_cons (thunk, handler)))
140 /* This table must agree with the list of M_ constants in memoize.h */
141 static const char *const memoized_tags
[] =
164 scm_print_memoized (SCM memoized
, SCM port
, scm_print_state
*pstate
)
166 scm_puts_unlocked ("#<memoized ", port
);
167 scm_write (scm_unmemoize_expression (memoized
), port
);
168 scm_puts_unlocked (">", port
);
177 lookup (SCM x
, SCM env
)
180 for (; scm_is_pair (env
); env
= CDR (env
), i
++)
181 if (scm_is_eq (x
, CAR (env
)))
182 return i
; /* bound */
187 /* Abbreviate SCM_EXPANDED_REF. Copied because I'm not sure about symbol pasting */
188 #define REF(x,type,field) \
189 (scm_struct_ref (x, SCM_I_MAKINUM (SCM_EXPANDED_##type##_##field)))
191 static SCM list_of_guile
= SCM_BOOL_F
;
193 static SCM
memoize (SCM exp
, SCM env
);
196 memoize_exps (SCM exps
, SCM env
)
199 for (ret
= SCM_EOL
; scm_is_pair (exps
); exps
= CDR (exps
))
200 ret
= scm_cons (memoize (CAR (exps
), env
), ret
);
201 return scm_reverse_x (ret
, SCM_UNDEFINED
);
205 memoize (SCM exp
, SCM env
)
207 if (!SCM_EXPANDED_P (exp
))
210 switch (SCM_EXPANDED_TYPE (exp
))
212 case SCM_EXPANDED_VOID
:
213 return MAKMEMO_QUOTE (SCM_UNSPECIFIED
);
215 case SCM_EXPANDED_CONST
:
216 return MAKMEMO_QUOTE (REF (exp
, CONST
, EXP
));
218 case SCM_EXPANDED_PRIMITIVE_REF
:
219 if (scm_is_eq (scm_current_module (), scm_the_root_module ()))
220 return MAKMEMO_TOP_REF (REF (exp
, PRIMITIVE_REF
, NAME
));
222 return MAKMEMO_MOD_REF (list_of_guile
, REF (exp
, PRIMITIVE_REF
, NAME
),
225 case SCM_EXPANDED_LEXICAL_REF
:
226 return MAKMEMO_LEX_REF (lookup (REF (exp
, LEXICAL_REF
, GENSYM
), env
));
228 case SCM_EXPANDED_LEXICAL_SET
:
229 return MAKMEMO_LEX_SET (lookup (REF (exp
, LEXICAL_SET
, GENSYM
), env
),
230 memoize (REF (exp
, LEXICAL_SET
, EXP
), env
));
232 case SCM_EXPANDED_MODULE_REF
:
233 return MAKMEMO_MOD_REF (REF (exp
, MODULE_REF
, MOD
),
234 REF (exp
, MODULE_REF
, NAME
),
235 REF (exp
, MODULE_REF
, PUBLIC
));
237 case SCM_EXPANDED_MODULE_SET
:
238 return MAKMEMO_MOD_SET (memoize (REF (exp
, MODULE_SET
, EXP
), env
),
239 REF (exp
, MODULE_SET
, MOD
),
240 REF (exp
, MODULE_SET
, NAME
),
241 REF (exp
, MODULE_SET
, PUBLIC
));
243 case SCM_EXPANDED_TOPLEVEL_REF
:
244 return MAKMEMO_TOP_REF (REF (exp
, TOPLEVEL_REF
, NAME
));
246 case SCM_EXPANDED_TOPLEVEL_SET
:
247 return MAKMEMO_TOP_SET (REF (exp
, TOPLEVEL_SET
, NAME
),
248 memoize (REF (exp
, TOPLEVEL_SET
, EXP
), env
));
250 case SCM_EXPANDED_TOPLEVEL_DEFINE
:
251 return MAKMEMO_DEFINE (REF (exp
, TOPLEVEL_DEFINE
, NAME
),
252 memoize (REF (exp
, TOPLEVEL_DEFINE
, EXP
), env
));
254 case SCM_EXPANDED_CONDITIONAL
:
255 return MAKMEMO_IF (memoize (REF (exp
, CONDITIONAL
, TEST
), env
),
256 memoize (REF (exp
, CONDITIONAL
, CONSEQUENT
), env
),
257 memoize (REF (exp
, CONDITIONAL
, ALTERNATE
), env
));
259 case SCM_EXPANDED_CALL
:
263 proc
= REF (exp
, CALL
, PROC
);
264 args
= memoize_exps (REF (exp
, CALL
, ARGS
), env
);
266 return MAKMEMO_CALL (memoize (proc
, env
), scm_ilength (args
), args
);
269 case SCM_EXPANDED_PRIMCALL
:
274 name
= REF (exp
, PRIMCALL
, NAME
);
275 args
= memoize_exps (REF (exp
, PRIMCALL
, ARGS
), env
);
276 nargs
= scm_ilength (args
);
279 && scm_is_eq (name
, scm_from_latin1_symbol ("call-with-prompt")))
280 return MAKMEMO_CALL_WITH_PROMPT (CAR (args
),
284 && scm_is_eq (name
, scm_from_latin1_symbol ("apply")))
285 return MAKMEMO_APPLY (CAR (args
), CADR (args
));
288 scm_from_latin1_symbol
289 ("call-with-current-continuation")))
290 return MAKMEMO_CONT (CAR (args
));
293 scm_from_latin1_symbol ("call-with-values")))
294 return MAKMEMO_CALL_WITH_VALUES (CAR (args
), CADR (args
));
296 && scm_is_eq (name
, scm_from_latin1_symbol ("wind")))
297 return MAKMEMO_CALL (MAKMEMO_QUOTE (wind
), 2, args
);
299 && scm_is_eq (name
, scm_from_latin1_symbol ("unwind")))
300 return MAKMEMO_CALL (MAKMEMO_QUOTE (unwind
), 0, SCM_EOL
);
301 else if (scm_is_eq (scm_current_module (), scm_the_root_module ()))
302 return MAKMEMO_CALL (MAKMEMO_TOP_REF (name
), nargs
, args
);
304 return MAKMEMO_CALL (MAKMEMO_MOD_REF (list_of_guile
, name
,
310 case SCM_EXPANDED_SEQ
:
311 return MAKMEMO_SEQ (memoize (REF (exp
, SEQ
, HEAD
), env
),
312 memoize (REF (exp
, SEQ
, TAIL
), env
));
314 case SCM_EXPANDED_LAMBDA
:
315 /* The body will be a lambda-case or #f. */
317 SCM meta
, docstring
, body
, proc
;
319 meta
= REF (exp
, LAMBDA
, META
);
320 docstring
= scm_assoc_ref (meta
, scm_sym_documentation
);
322 body
= REF (exp
, LAMBDA
, BODY
);
323 if (scm_is_false (body
))
324 /* Give a body to case-lambda with no clauses. */
325 proc
= MAKMEMO_LAMBDA
327 (MAKMEMO_MOD_REF (list_of_guile
,
328 scm_from_latin1_symbol ("throw"),
331 scm_list_5 (MAKMEMO_QUOTE (scm_args_number_key
),
332 MAKMEMO_QUOTE (SCM_BOOL_F
),
333 MAKMEMO_QUOTE (scm_from_latin1_string
334 ("Wrong number of arguments")),
335 MAKMEMO_QUOTE (SCM_EOL
),
336 MAKMEMO_QUOTE (SCM_BOOL_F
))),
338 SCM_BOOL_F
/* docstring */);
340 proc
= memoize (body
, env
);
342 if (scm_is_string (docstring
))
344 SCM args
= SCM_MEMOIZED_ARGS (proc
);
345 SCM_SETCAR (SCM_CDR (args
), docstring
);
351 case SCM_EXPANDED_LAMBDA_CASE
:
353 SCM req
, rest
, opt
, kw
, inits
, vars
, body
, alt
;
354 SCM walk
, minits
, arity
, new_env
;
355 int nreq
, nopt
, ntotal
;
357 req
= REF (exp
, LAMBDA_CASE
, REQ
);
358 rest
= scm_not (scm_not (REF (exp
, LAMBDA_CASE
, REST
)));
359 opt
= REF (exp
, LAMBDA_CASE
, OPT
);
360 kw
= REF (exp
, LAMBDA_CASE
, KW
);
361 inits
= REF (exp
, LAMBDA_CASE
, INITS
);
362 vars
= REF (exp
, LAMBDA_CASE
, GENSYMS
);
363 body
= REF (exp
, LAMBDA_CASE
, BODY
);
364 alt
= REF (exp
, LAMBDA_CASE
, ALTERNATE
);
366 nreq
= scm_ilength (req
);
367 nopt
= scm_is_pair (opt
) ? scm_ilength (opt
) : 0;
368 ntotal
= scm_ilength (vars
);
370 /* The vars are the gensyms, according to the divine plan. But we need
371 to memoize the inits within their appropriate environment,
372 complicating things. */
374 for (walk
= req
; scm_is_pair (walk
);
375 walk
= CDR (walk
), vars
= CDR (vars
))
376 new_env
= scm_cons (CAR (vars
), new_env
);
379 for (walk
= opt
; scm_is_pair (walk
);
380 walk
= CDR (walk
), vars
= CDR (vars
), inits
= CDR (inits
))
382 minits
= scm_cons (memoize (CAR (inits
), new_env
), minits
);
383 new_env
= scm_cons (CAR (vars
), new_env
);
386 if (scm_is_true (rest
))
388 new_env
= scm_cons (CAR (vars
), new_env
);
392 for (; scm_is_pair (inits
); vars
= CDR (vars
), inits
= CDR (inits
))
394 minits
= scm_cons (memoize (CAR (inits
), new_env
), minits
);
395 new_env
= scm_cons (CAR (vars
), new_env
);
397 if (!scm_is_null (vars
))
400 minits
= scm_reverse_x (minits
, SCM_UNDEFINED
);
402 if (scm_is_true (kw
))
404 /* (aok? (kw name sym) ...) -> (aok? (kw . index) ...) */
405 SCM aok
= CAR (kw
), indices
= SCM_EOL
;
406 for (kw
= CDR (kw
); scm_is_pair (kw
); kw
= CDR (kw
))
412 idx
= ntotal
- 1 - lookup (CADDR (CAR (kw
)), new_env
);
413 indices
= scm_acons (k
, SCM_I_MAKINUM (idx
), indices
);
415 kw
= scm_cons (aok
, scm_reverse_x (indices
, SCM_UNDEFINED
));
418 if (scm_is_false (alt
) && scm_is_false (kw
) && scm_is_false (opt
))
420 if (scm_is_false (rest
))
421 arity
= FIXED_ARITY (nreq
);
423 arity
= REST_ARITY (nreq
, SCM_BOOL_T
);
425 else if (scm_is_true (alt
))
426 arity
= FULL_ARITY (nreq
, rest
, nopt
, kw
, minits
,
427 SCM_MEMOIZED_ARGS (memoize (alt
, env
)));
429 arity
= FULL_ARITY (nreq
, rest
, nopt
, kw
, minits
, SCM_BOOL_F
);
431 return MAKMEMO_LAMBDA (memoize (body
, new_env
), arity
,
432 SCM_BOOL_F
/* docstring */);
435 case SCM_EXPANDED_LET
:
437 SCM vars
, exps
, body
, inits
, new_env
;
439 vars
= REF (exp
, LET
, GENSYMS
);
440 exps
= REF (exp
, LET
, VALS
);
441 body
= REF (exp
, LET
, BODY
);
445 for (; scm_is_pair (vars
); vars
= CDR (vars
), exps
= CDR (exps
))
447 new_env
= scm_cons (CAR (vars
), new_env
);
448 inits
= scm_cons (memoize (CAR (exps
), env
), inits
);
451 return MAKMEMO_LET (scm_reverse_x (inits
, SCM_UNDEFINED
),
452 memoize (body
, new_env
));
455 case SCM_EXPANDED_LETREC
:
457 SCM vars
, exps
, body
, undefs
, new_env
;
458 int i
, nvars
, in_order_p
;
460 vars
= REF (exp
, LETREC
, GENSYMS
);
461 exps
= REF (exp
, LETREC
, VALS
);
462 body
= REF (exp
, LETREC
, BODY
);
463 in_order_p
= scm_is_true (REF (exp
, LETREC
, IN_ORDER_P
));
464 nvars
= i
= scm_ilength (vars
);
468 for (; scm_is_pair (vars
); vars
= CDR (vars
))
470 new_env
= scm_cons (CAR (vars
), new_env
);
471 undefs
= scm_cons (MAKMEMO_QUOTE (SCM_UNDEFINED
), undefs
);
476 SCM body_exps
= SCM_EOL
, seq
;
477 for (; scm_is_pair (exps
); exps
= CDR (exps
), i
--)
478 body_exps
= scm_cons (MAKMEMO_LEX_SET (i
-1,
479 memoize (CAR (exps
), new_env
)),
482 seq
= memoize (body
, new_env
);
483 for (; scm_is_pair (body_exps
); body_exps
= CDR (body_exps
))
484 seq
= MAKMEMO_SEQ (CAR (body_exps
), seq
);
486 return MAKMEMO_LET (undefs
, seq
);
490 SCM sets
= SCM_EOL
, inits
= SCM_EOL
, set_seq
;
491 for (; scm_is_pair (exps
); exps
= CDR (exps
), i
--)
493 sets
= scm_cons (MAKMEMO_LEX_SET ((i
-1) + nvars
,
494 MAKMEMO_LEX_REF (i
-1)),
496 inits
= scm_cons (memoize (CAR (exps
), new_env
), inits
);
498 inits
= scm_reverse_x (inits
, SCM_UNDEFINED
);
500 sets
= scm_reverse_x (sets
, SCM_UNDEFINED
);
501 if (scm_is_null (sets
))
502 return memoize (body
, env
);
504 for (set_seq
= CAR (sets
), sets
= CDR (sets
); scm_is_pair (sets
);
506 set_seq
= MAKMEMO_SEQ (CAR (sets
), set_seq
);
508 return MAKMEMO_LET (undefs
,
509 MAKMEMO_SEQ (MAKMEMO_LET (inits
, set_seq
),
510 memoize (body
, new_env
)));
514 case SCM_EXPANDED_DYNLET
:
515 return MAKMEMO_WITH_FLUIDS (memoize_exps (REF (exp
, DYNLET
, FLUIDS
), env
),
516 memoize_exps (REF (exp
, DYNLET
, VALS
), env
),
517 memoize (REF (exp
, DYNLET
, BODY
), env
));
527 SCM_DEFINE (scm_memoize_expression
, "memoize-expression", 1, 0, 0,
529 "Memoize the expression @var{exp}.")
530 #define FUNC_NAME s_scm_memoize_expression
532 SCM_ASSERT_TYPE (SCM_EXPANDED_P (exp
), exp
, 1, FUNC_NAME
, "expanded");
533 return memoize (exp
, scm_current_module ());
540 SCM_SYMBOL (sym_placeholder
, "_");
542 static SCM
unmemoize (SCM expr
);
545 unmemoize_exprs (SCM exprs
)
548 if (scm_is_null (exprs
))
550 ret
= scm_list_1 (unmemoize (CAR (exprs
)));
552 for (exprs
= CDR (exprs
); !scm_is_null (exprs
); exprs
= CDR (exprs
))
554 SCM_SETCDR (tail
, scm_list_1 (unmemoize (CAR (exprs
))));
561 unmemoize_bindings (SCM inits
)
564 if (scm_is_null (inits
))
566 ret
= scm_list_1 (scm_list_2 (sym_placeholder
, unmemoize (CAR (inits
))));
568 for (inits
= CDR (inits
); !scm_is_null (inits
); inits
= CDR (inits
))
570 SCM_SETCDR (tail
, scm_list_1 (scm_list_2 (sym_placeholder
,
571 unmemoize (CAR (inits
)))));
578 unmemoize_lexical (SCM n
)
582 snprintf (buf
, 15, "<%u>", scm_to_uint32 (n
));
583 return scm_from_utf8_symbol (buf
);
587 unmemoize (const SCM expr
)
591 if (!SCM_MEMOIZED_P (expr
))
594 args
= SCM_MEMOIZED_ARGS (expr
);
595 switch (SCM_MEMOIZED_TAG (expr
))
598 return scm_cons (scm_from_latin1_symbol ("apply"),
599 unmemoize_exprs (args
));
601 return scm_list_3 (scm_sym_begin
, unmemoize (CAR (args
)),
602 unmemoize (CDR (args
)));
604 return scm_cons (unmemoize (CAR (args
)), unmemoize_exprs (CDDR (args
)));
606 return scm_list_2 (scm_from_latin1_symbol
607 ("call-with-current_continuation"),
609 case SCM_M_CALL_WITH_VALUES
:
610 return scm_list_3 (scm_from_latin1_symbol ("call-with-values"),
611 unmemoize (CAR (args
)), unmemoize (CDR (args
)));
613 return scm_list_3 (scm_sym_define
, CAR (args
), unmemoize (CDR (args
)));
614 case SCM_M_WITH_FLUIDS
:
616 SCM binds
= SCM_EOL
, fluids
, vals
;
617 for (fluids
= CAR (args
), vals
= CADR (args
); scm_is_pair (fluids
);
618 fluids
= CDR (fluids
), vals
= CDR (vals
))
619 binds
= scm_cons (scm_list_2 (unmemoize (CAR (fluids
)),
620 unmemoize (CAR (vals
))),
622 return scm_list_3 (scm_sym_with_fluids
,
623 scm_reverse_x (binds
, SCM_UNDEFINED
),
624 unmemoize (CDDR (args
)));
627 return scm_list_4 (scm_sym_if
, unmemoize (scm_car (args
)),
628 unmemoize (scm_cadr (args
)), unmemoize (scm_cddr (args
)));
631 SCM body
= CAR (args
), spec
= CDDR (args
);
633 if (scm_is_null (CDR (spec
)))
634 return scm_list_3 (scm_sym_lambda
,
635 scm_make_list (CAR (spec
), sym_placeholder
),
636 unmemoize (CAR (args
)));
637 else if (scm_is_null (SCM_CDDR (spec
)))
639 SCM formals
= scm_make_list (CAR (spec
), sym_placeholder
);
640 return scm_list_3 (scm_sym_lambda
,
641 scm_is_true (CADR (spec
))
642 ? scm_cons_star (sym_placeholder
, formals
)
644 unmemoize (CAR (args
)));
650 alt
= CADDR (CDDDR (spec
));
651 if (scm_is_true (alt
))
652 tail
= CDR (unmemoize (alt
));
657 (sym_case_lambda_star
,
658 scm_cons (scm_list_2 (scm_list_5 (CAR (spec
),
662 unmemoize_exprs (CADR (CDDDR (spec
)))),
668 return scm_list_3 (scm_sym_let
,
669 unmemoize_bindings (CAR (args
)),
670 unmemoize (CDR (args
)));
672 return scm_list_2 (scm_sym_quote
, args
);
673 case SCM_M_LEXICAL_REF
:
674 return unmemoize_lexical (args
);
675 case SCM_M_LEXICAL_SET
:
676 return scm_list_3 (scm_sym_set_x
, unmemoize_lexical (CAR (args
)),
677 unmemoize (CDR (args
)));
678 case SCM_M_TOPLEVEL_REF
:
680 case SCM_M_TOPLEVEL_SET
:
681 return scm_list_3 (scm_sym_set_x
, CAR (args
), unmemoize (CDR (args
)));
682 case SCM_M_MODULE_REF
:
683 return SCM_VARIABLEP (args
) ? args
684 : scm_list_3 (scm_is_true (CDDR (args
)) ? scm_sym_at
: scm_sym_atat
,
685 scm_i_finite_list_copy (CAR (args
)),
687 case SCM_M_MODULE_SET
:
688 return scm_list_3 (scm_sym_set_x
,
689 SCM_VARIABLEP (CDR (args
)) ? CDR (args
)
690 : scm_list_3 (scm_is_true (CDDDR (args
))
691 ? scm_sym_at
: scm_sym_atat
,
692 scm_i_finite_list_copy (CADR (args
)),
694 unmemoize (CAR (args
)));
695 case SCM_M_CALL_WITH_PROMPT
:
696 return scm_list_4 (scm_from_latin1_symbol ("call-with-prompt"),
697 unmemoize (CAR (args
)),
698 unmemoize (CADR (args
)),
699 unmemoize (CDDR (args
)));
708 SCM_DEFINE (scm_memoized_p
, "memoized?", 1, 0, 0,
710 "Return @code{#t} if @var{obj} is memoized.")
711 #define FUNC_NAME s_scm_memoized_p
713 return scm_from_bool (SCM_MEMOIZED_P (obj
));
717 SCM_DEFINE (scm_unmemoize_expression
, "unmemoize-expression", 1, 0, 0,
719 "Unmemoize the memoized expression @var{m}.")
720 #define FUNC_NAME s_scm_unmemoize_expression
722 SCM_VALIDATE_MEMOIZED (1, m
);
723 return unmemoize (m
);
727 SCM_DEFINE (scm_memoized_expression_typecode
, "memoized-expression-typecode", 1, 0, 0,
729 "Return the typecode from the memoized expression @var{m}.")
730 #define FUNC_NAME s_scm_memoized_expression_typecode
732 SCM_VALIDATE_MEMOIZED (1, m
);
734 /* The tag is a 16-bit integer so it fits in an inum. */
735 return SCM_I_MAKINUM (SCM_MEMOIZED_TAG (m
));
739 SCM_DEFINE (scm_memoized_expression_data
, "memoized-expression-data", 1, 0, 0,
741 "Return the data from the memoized expression @var{m}.")
742 #define FUNC_NAME s_scm_memoized_expression_data
744 SCM_VALIDATE_MEMOIZED (1, m
);
745 return SCM_MEMOIZED_ARGS (m
);
749 SCM_DEFINE (scm_memoized_typecode
, "memoized-typecode", 1, 0, 0,
751 "Return the memoized typecode corresponding to the symbol @var{sym}.")
752 #define FUNC_NAME s_scm_memoized_typecode
756 SCM_VALIDATE_SYMBOL (1, sym
);
758 for (i
= 0; i
< sizeof(memoized_tags
)/sizeof(const char*); i
++)
759 if (strcmp (scm_i_symbol_chars (sym
), memoized_tags
[i
]) == 0)
760 return scm_from_int32 (i
);
766 SCM_SYMBOL (scm_unbound_variable_key
, "unbound-variable");
767 static void error_unbound_variable (SCM symbol
) SCM_NORETURN
;
768 static void error_unbound_variable (SCM symbol
)
770 scm_error (scm_unbound_variable_key
, NULL
, "Unbound variable: ~S",
771 scm_list_1 (symbol
), SCM_BOOL_F
);
774 SCM_DEFINE (scm_memoize_variable_access_x
, "memoize-variable-access!", 2, 0, 0,
776 "Look up and cache the variable that @var{m} will access, returning the variable.")
777 #define FUNC_NAME s_scm_memoize_variable_access_x
780 SCM_VALIDATE_MEMOIZED (1, m
);
781 mx
= SCM_MEMOIZED_ARGS (m
);
782 switch (SCM_MEMOIZED_TAG (m
))
784 case SCM_M_TOPLEVEL_REF
:
785 if (SCM_VARIABLEP (mx
))
789 SCM var
= scm_module_variable (mod
, mx
);
790 if (scm_is_false (var
) || scm_is_false (scm_variable_bound_p (var
)))
791 error_unbound_variable (mx
);
792 SCM_SET_SMOB_OBJECT (m
, var
);
796 case SCM_M_TOPLEVEL_SET
:
799 if (SCM_VARIABLEP (var
))
803 var
= scm_module_variable (mod
, var
);
804 if (scm_is_false (var
))
805 error_unbound_variable (CAR (mx
));
806 SCM_SETCAR (mx
, var
);
811 case SCM_M_MODULE_REF
:
812 if (SCM_VARIABLEP (mx
))
817 mod
= scm_resolve_module (CAR (mx
));
818 if (scm_is_true (CDDR (mx
)))
819 mod
= scm_module_public_interface (mod
);
820 var
= scm_module_lookup (mod
, CADR (mx
));
821 if (scm_is_false (scm_variable_bound_p (var
)))
822 error_unbound_variable (CADR (mx
));
823 SCM_SET_SMOB_OBJECT (m
, var
);
827 case SCM_M_MODULE_SET
:
828 /* FIXME: not quite threadsafe */
829 if (SCM_VARIABLEP (CDR (mx
)))
834 mod
= scm_resolve_module (CADR (mx
));
835 if (scm_is_true (CDDDR (mx
)))
836 mod
= scm_module_public_interface (mod
);
837 var
= scm_module_lookup (mod
, CADDR (mx
));
838 SCM_SETCDR (mx
, var
);
843 scm_wrong_type_arg (FUNC_NAME
, 1, m
);
855 scm_tc16_memoized
= scm_make_smob_type ("%memoized", 0);
856 scm_set_smob_print (scm_tc16_memoized
, scm_print_memoized
);
858 #include "libguile/memoize.x"
860 wind
= scm_c_make_gsubr ("wind", 2, 0, 0, do_wind
);
861 unwind
= scm_c_make_gsubr ("unwind", 0, 0, 0, do_unwind
);
863 list_of_guile
= scm_list_1 (scm_from_latin1_symbol ("guile"));