1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,
2 * 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
30 #include "libguile/__scm.h"
32 #include "libguile/_scm.h"
33 #include "libguile/alist.h"
34 #include "libguile/async.h"
35 #include "libguile/continuations.h"
36 #include "libguile/control.h"
37 #include "libguile/debug.h"
38 #include "libguile/deprecation.h"
39 #include "libguile/dynwind.h"
40 #include "libguile/eq.h"
41 #include "libguile/expand.h"
42 #include "libguile/feature.h"
43 #include "libguile/goops.h"
44 #include "libguile/hash.h"
45 #include "libguile/hashtab.h"
46 #include "libguile/list.h"
47 #include "libguile/macros.h"
48 #include "libguile/memoize.h"
49 #include "libguile/modules.h"
50 #include "libguile/ports.h"
51 #include "libguile/print.h"
52 #include "libguile/procprop.h"
53 #include "libguile/programs.h"
54 #include "libguile/root.h"
55 #include "libguile/smob.h"
56 #include "libguile/srcprop.h"
57 #include "libguile/stackchk.h"
58 #include "libguile/strings.h"
59 #include "libguile/threads.h"
60 #include "libguile/throw.h"
61 #include "libguile/validate.h"
62 #include "libguile/values.h"
63 #include "libguile/vectors.h"
64 #include "libguile/vm.h"
66 #include "libguile/eval.h"
67 #include "libguile/private-options.h"
72 /* We have three levels of EVAL here:
76 evaluates EXP in environment ENV. ENV is a lexical environment
77 structure as used by the actual tree code evaluator. When ENV is
78 a top-level environment, then changes to the current module are
79 tracked by updating ENV so that it continues to be in sync with
82 - scm_primitive_eval (exp)
84 evaluates EXP in the top-level environment as determined by the
85 current module. This is done by constructing a suitable
86 environment and calling eval. Thus, changes to the
87 top-level module are tracked normally.
91 evaluates EXP while MOD is the current module. This is done
92 by setting the current module to MOD_OR_STATE, invoking
93 scm_primitive_eval on EXP, and then restoring the current module
94 to the value it had previously. That is, while EXP is evaluated,
95 changes to the current module (or dynamic state) are tracked,
96 but these changes do not persist when scm_eval returns.
101 /* Boot closures. We only see these when compiling eval.scm, because once
102 eval.scm is in the house, closures are standard VM closures.
105 static scm_t_bits scm_tc16_boot_closure
;
106 #define RETURN_BOOT_CLOSURE(code, env) \
107 SCM_RETURN_NEWSMOB2 (scm_tc16_boot_closure, SCM_UNPACK (code), SCM_UNPACK (env))
108 #define BOOT_CLOSURE_P(obj) SCM_TYP16_PREDICATE (scm_tc16_boot_closure, (obj))
109 #define BOOT_CLOSURE_CODE(x) SCM_SMOB_OBJECT (x)
110 #define BOOT_CLOSURE_ENV(x) SCM_SMOB_OBJECT_2 (x)
111 #define BOOT_CLOSURE_BODY(x) CAR (BOOT_CLOSURE_CODE (x))
112 #define BOOT_CLOSURE_NUM_REQUIRED_ARGS(x) (SCM_I_INUM (CADDR (BOOT_CLOSURE_CODE (x))))
113 #define BOOT_CLOSURE_IS_FIXED(x) (scm_is_null (CDDDR (BOOT_CLOSURE_CODE (x))))
114 /* NB: One may only call the following accessors if the closure is not FIXED. */
115 #define BOOT_CLOSURE_HAS_REST_ARGS(x) scm_is_true (CADDR (SCM_CDR (BOOT_CLOSURE_CODE (x))))
116 #define BOOT_CLOSURE_IS_REST(x) scm_is_null (SCM_CDR (CDDDR (BOOT_CLOSURE_CODE (x))))
117 /* NB: One may only call the following accessors if the closure is not REST. */
118 #define BOOT_CLOSURE_IS_FULL(x) (1)
119 #define BOOT_CLOSURE_PARSE_FULL(fu_,body,nargs,rest,nopt,kw,inits,alt) \
121 body = CAR (fu); fu = CDDR (fu); \
123 rest = kw = alt = SCM_BOOL_F; \
127 nreq = SCM_I_INUM (CAR (fu)); fu = CDR (fu); \
128 if (scm_is_pair (fu)) \
130 rest = CAR (fu); fu = CDR (fu); \
131 if (scm_is_pair (fu)) \
133 nopt = SCM_I_INUM (CAR (fu)); fu = CDR (fu); \
134 kw = CAR (fu); fu = CDR (fu); \
135 inits = CAR (fu); fu = CDR (fu); \
140 static void prepare_boot_closure_env_for_apply (SCM proc
, SCM args
,
141 SCM
*out_body
, SCM
*out_env
);
142 static void prepare_boot_closure_env_for_eval (SCM proc
, unsigned int argc
,
143 SCM exps
, SCM
*out_body
,
147 #define CAR(x) SCM_CAR(x)
148 #define CDR(x) SCM_CDR(x)
149 #define CAAR(x) SCM_CAAR(x)
150 #define CADR(x) SCM_CADR(x)
151 #define CDAR(x) SCM_CDAR(x)
152 #define CDDR(x) SCM_CDDR(x)
153 #define CADDR(x) SCM_CADDR(x)
154 #define CDDDR(x) SCM_CDDDR(x)
156 #define VECTOR_REF(v, i) (SCM_SIMPLE_VECTOR_REF (v, i))
157 #define VECTOR_SET(v, i, x) (SCM_SIMPLE_VECTOR_SET (v, i, x))
158 #define VECTOR_LENGTH(v) (SCM_SIMPLE_VECTOR_LENGTH (v))
161 make_env (int n
, SCM init
, SCM next
)
163 SCM env
= scm_c_make_vector (n
+ 1, init
);
164 VECTOR_SET (env
, 0, next
);
171 return VECTOR_REF (env
, 0);
177 while (SCM_I_IS_VECTOR (env
))
178 env
= next_rib (env
);
183 env_ref (SCM env
, int depth
, int width
)
186 env
= next_rib (env
);
187 return VECTOR_REF (env
, width
+ 1);
191 env_set (SCM env
, int depth
, int width
, SCM val
)
194 env
= next_rib (env
);
195 VECTOR_SET (env
, width
+ 1, val
);
199 SCM_SYMBOL (scm_unbound_variable_key
, "unbound-variable");
201 static void error_used_before_defined (void)
203 scm_error (scm_unbound_variable_key
, NULL
,
204 "Variable used before given a value", SCM_EOL
, SCM_BOOL_F
);
207 static void error_invalid_keyword (SCM proc
, SCM obj
)
209 scm_error_scm (scm_from_latin1_symbol ("keyword-argument-error"), proc
,
210 scm_from_locale_string ("Invalid keyword"), SCM_EOL
,
214 static void error_unrecognized_keyword (SCM proc
, SCM kw
)
216 scm_error_scm (scm_from_latin1_symbol ("keyword-argument-error"), proc
,
217 scm_from_locale_string ("Unrecognized keyword"), SCM_EOL
,
222 /* Multiple values truncation. */
224 truncate_values (SCM x
)
226 if (SCM_LIKELY (!SCM_VALUESP (x
)))
230 SCM l
= scm_struct_ref (x
, SCM_INUM0
);
231 if (SCM_LIKELY (scm_is_pair (l
)))
235 scm_ithrow (scm_from_latin1_symbol ("vm-run"),
236 scm_list_3 (scm_from_latin1_symbol ("vm-run"),
237 scm_from_locale_string
238 ("Too few values returned to continuation"),
246 #define EVAL1(x, env) (truncate_values (eval ((x), (env))))
249 eval (SCM x
, SCM env
)
252 SCM proc
= SCM_UNDEFINED
, args
= SCM_EOL
;
258 mx
= SCM_MEMOIZED_ARGS (x
);
259 switch (SCM_I_INUM (SCM_CAR (x
)))
262 eval (CAR (mx
), env
);
267 if (scm_is_true (EVAL1 (CAR (mx
), env
)))
275 SCM inits
= CAR (mx
);
279 new_env
= make_env (VECTOR_LENGTH (inits
), SCM_UNDEFINED
, env
);
280 for (i
= 0; i
< VECTOR_LENGTH (inits
); i
++)
281 env_set (new_env
, 0, i
, EVAL1 (VECTOR_REF (inits
, i
), env
));
288 RETURN_BOOT_CLOSURE (mx
, env
);
294 scm_define (CAR (mx
), EVAL1 (CDR (mx
), env
));
295 return SCM_UNSPECIFIED
;
297 case SCM_M_CAPTURE_MODULE
:
298 return eval (mx
, scm_current_module ());
301 /* Evaluate the procedure to be applied. */
302 proc
= EVAL1 (CAR (mx
), env
);
303 /* Evaluate the argument holding the list of arguments */
304 args
= EVAL1 (CADR (mx
), env
);
307 /* Go here to tail-apply a procedure. PROC is the procedure and
308 * ARGS is the list of arguments. */
309 if (BOOT_CLOSURE_P (proc
))
311 prepare_boot_closure_env_for_apply (proc
, args
, &x
, &env
);
315 return scm_apply_0 (proc
, args
);
318 /* Evaluate the procedure to be applied. */
319 proc
= EVAL1 (CAR (mx
), env
);
320 argc
= SCM_I_INUM (CADR (mx
));
323 if (BOOT_CLOSURE_P (proc
))
325 prepare_boot_closure_env_for_eval (proc
, argc
, mx
, &x
, &env
);
333 argv
= alloca (argc
* sizeof (SCM
));
334 for (i
= 0; i
< argc
; i
++, mx
= CDR (mx
))
335 argv
[i
] = EVAL1 (CAR (mx
), env
);
337 return scm_call_n (proc
, argv
, argc
);
341 return scm_i_call_with_current_continuation (EVAL1 (mx
, env
));
343 case SCM_M_CALL_WITH_VALUES
:
348 producer
= EVAL1 (CAR (mx
), env
);
349 /* `proc' is the consumer. */
350 proc
= EVAL1 (CDR (mx
), env
);
351 v
= scm_call_0 (producer
);
353 args
= scm_struct_ref (v
, SCM_INUM0
);
355 args
= scm_list_1 (v
);
359 case SCM_M_LEXICAL_REF
:
365 depth
= SCM_I_INUM (CAR (pos
));
366 width
= SCM_I_INUM (CDR (pos
));
368 ret
= env_ref (env
, depth
, width
);
370 if (SCM_UNLIKELY (SCM_UNBNDP (ret
)))
371 /* we don't know what variable, though, because we don't have its
373 error_used_before_defined ();
377 case SCM_M_LEXICAL_SET
:
381 SCM val
= EVAL1 (CDR (mx
), env
);
384 depth
= SCM_I_INUM (CAR (pos
));
385 width
= SCM_I_INUM (CDR (pos
));
387 env_set (env
, depth
, width
, val
);
389 return SCM_UNSPECIFIED
;
392 case SCM_M_TOPLEVEL_REF
:
393 if (SCM_VARIABLEP (mx
))
394 return SCM_VARIABLE_REF (mx
);
397 env
= env_tail (env
);
398 return SCM_VARIABLE_REF (scm_memoize_variable_access_x (x
, env
));
401 case SCM_M_TOPLEVEL_SET
:
404 SCM val
= EVAL1 (CDR (mx
), env
);
405 if (SCM_VARIABLEP (var
))
407 SCM_VARIABLE_SET (var
, val
);
408 return SCM_UNSPECIFIED
;
412 env
= env_tail (env
);
413 SCM_VARIABLE_SET (scm_memoize_variable_access_x (x
, env
), val
);
414 return SCM_UNSPECIFIED
;
418 case SCM_M_MODULE_REF
:
419 if (SCM_VARIABLEP (mx
))
420 return SCM_VARIABLE_REF (mx
);
422 return SCM_VARIABLE_REF
423 (scm_memoize_variable_access_x (x
, SCM_BOOL_F
));
425 case SCM_M_MODULE_SET
:
426 if (SCM_VARIABLEP (CDR (mx
)))
428 SCM_VARIABLE_SET (CDR (mx
), EVAL1 (CAR (mx
), env
));
429 return SCM_UNSPECIFIED
;
434 (scm_memoize_variable_access_x (x
, SCM_BOOL_F
),
435 EVAL1 (CAR (mx
), env
));
436 return SCM_UNSPECIFIED
;
439 case SCM_M_CALL_WITH_PROMPT
:
443 scm_i_jmp_buf registers
;
444 /* We need the handler after nonlocal return to the setjmp, so
445 make sure it is volatile. */
446 volatile SCM handler
;
448 k
= EVAL1 (CAR (mx
), env
);
449 handler
= EVAL1 (CDDR (mx
), env
);
452 /* Push the prompt onto the dynamic stack. */
453 scm_dynstack_push_prompt (&SCM_I_CURRENT_THREAD
->dynstack
,
454 SCM_F_DYNSTACK_PROMPT_ESCAPE_ONLY
455 | SCM_F_DYNSTACK_PROMPT_PUSH_NARGS
,
457 vp
->fp
- vp
->stack_base
,
458 vp
->sp
- vp
->stack_base
,
462 if (SCM_I_SETJMP (registers
))
464 /* The prompt exited nonlocally. */
467 args
= scm_i_prompt_pop_abort_args_x (vp
);
471 res
= scm_call_0 (eval (CADR (mx
), env
));
472 scm_dynstack_pop (&SCM_I_CURRENT_THREAD
->dynstack
);
483 /* Simple procedure calls
487 scm_call_0 (SCM proc
)
489 return scm_call_n (proc
, NULL
, 0);
493 scm_call_1 (SCM proc
, SCM arg1
)
495 return scm_call_n (proc
, &arg1
, 1);
499 scm_call_2 (SCM proc
, SCM arg1
, SCM arg2
)
501 SCM args
[] = { arg1
, arg2
};
502 return scm_call_n (proc
, args
, 2);
506 scm_call_3 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
)
508 SCM args
[] = { arg1
, arg2
, arg3
};
509 return scm_call_n (proc
, args
, 3);
513 scm_call_4 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM arg4
)
515 SCM args
[] = { arg1
, arg2
, arg3
, arg4
};
516 return scm_call_n (proc
, args
, 4);
520 scm_call_5 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM arg4
, SCM arg5
)
522 SCM args
[] = { arg1
, arg2
, arg3
, arg4
, arg5
};
523 return scm_call_n (proc
, args
, 5);
527 scm_call_6 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM arg4
, SCM arg5
,
530 SCM args
[] = { arg1
, arg2
, arg3
, arg4
, arg5
, arg6
};
531 return scm_call_n (proc
, args
, 6);
535 scm_call_7 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM arg4
, SCM arg5
,
538 SCM args
[] = { arg1
, arg2
, arg3
, arg4
, arg5
, arg6
, arg7
};
539 return scm_call_n (proc
, args
, 7);
543 scm_call_8 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM arg4
, SCM arg5
,
544 SCM arg6
, SCM arg7
, SCM arg8
)
546 SCM args
[] = { arg1
, arg2
, arg3
, arg4
, arg5
, arg6
, arg7
, arg8
};
547 return scm_call_n (proc
, args
, 8);
551 scm_call_9 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM arg4
, SCM arg5
,
552 SCM arg6
, SCM arg7
, SCM arg8
, SCM arg9
)
554 SCM args
[] = { arg1
, arg2
, arg3
, arg4
, arg5
, arg6
, arg7
, arg8
, arg9
};
555 return scm_call_n (proc
, args
, 9);
558 /* scm_call_n defined in vm.c */
561 scm_call (SCM proc
, ...)
567 va_start (argp
, proc
);
568 while (!SCM_UNBNDP (va_arg (argp
, SCM
)))
572 argv
= alloca (nargs
* sizeof (SCM
));
573 va_start (argp
, proc
);
574 for (i
= 0; i
< nargs
; i
++)
575 argv
[i
] = va_arg (argp
, SCM
);
578 return scm_call_n (proc
, argv
, nargs
);
581 /* Simple procedure applies
585 scm_apply_0 (SCM proc
, SCM args
)
590 nargs
= scm_ilength (args
);
591 if (SCM_UNLIKELY (nargs
< 0))
592 scm_wrong_type_arg_msg ("apply", 2, args
, "list");
594 /* FIXME: Use vm_builtin_apply instead of alloca. */
595 argv
= alloca (nargs
* sizeof(SCM
));
596 for (i
= 0; i
< nargs
; i
++)
598 argv
[i
] = SCM_CAR (args
);
599 args
= SCM_CDR (args
);
602 return scm_call_n (proc
, argv
, nargs
);
606 scm_apply_1 (SCM proc
, SCM arg1
, SCM args
)
608 return scm_apply_0 (proc
, scm_cons (arg1
, args
));
612 scm_apply_2 (SCM proc
, SCM arg1
, SCM arg2
, SCM args
)
614 return scm_apply_0 (proc
, scm_cons2 (arg1
, arg2
, args
));
618 scm_apply_3 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM args
)
620 return scm_apply_0 (proc
, scm_cons (arg1
, scm_cons2 (arg2
, arg3
, args
)));
625 scm_map (SCM proc
, SCM arg1
, SCM args
)
627 static SCM var
= SCM_BOOL_F
;
629 if (scm_is_false (var
))
630 var
= scm_private_variable (scm_the_root_module (),
631 scm_from_latin1_symbol ("map"));
633 return scm_apply_0 (scm_variable_ref (var
),
634 scm_cons (proc
, scm_cons (arg1
, args
)));
638 scm_for_each (SCM proc
, SCM arg1
, SCM args
)
640 static SCM var
= SCM_BOOL_F
;
642 if (scm_is_false (var
))
643 var
= scm_private_variable (scm_the_root_module (),
644 scm_from_latin1_symbol ("for-each"));
646 return scm_apply_0 (scm_variable_ref (var
),
647 scm_cons (proc
, scm_cons (arg1
, args
)));
652 scm_c_primitive_eval (SCM exp
)
654 if (!SCM_EXPANDED_P (exp
))
655 exp
= scm_call_1 (scm_current_module_transformer (), exp
);
656 return eval (scm_memoize_expression (exp
), SCM_BOOL_F
);
659 static SCM var_primitive_eval
;
661 scm_primitive_eval (SCM exp
)
663 return scm_call_n (scm_variable_ref (var_primitive_eval
),
668 /* Eval does not take the second arg optionally. This is intentional
669 * in order to be R5RS compatible, and to prepare for the new module
670 * system, where we would like to make the choice of evaluation
671 * environment explicit. */
673 SCM_DEFINE (scm_eval
, "eval", 2, 0, 0,
674 (SCM exp
, SCM module_or_state
),
675 "Evaluate @var{exp}, a list representing a Scheme expression,\n"
676 "in the top-level environment specified by\n"
677 "@var{module_or_state}.\n"
678 "While @var{exp} is evaluated (using @code{primitive-eval}),\n"
679 "@var{module_or_state} is made the current module when\n"
680 "it is a module, or the current dynamic state when it is\n"
682 "Example: (eval '(+ 1 2) (interaction-environment))")
683 #define FUNC_NAME s_scm_eval
687 scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE
);
688 if (scm_is_dynamic_state (module_or_state
))
689 scm_dynwind_current_dynamic_state (module_or_state
);
690 else if (scm_module_system_booted_p
)
692 SCM_VALIDATE_MODULE (2, module_or_state
);
693 scm_dynwind_current_module (module_or_state
);
695 /* otherwise if the module system isn't booted, ignore the module arg */
697 res
= scm_primitive_eval (exp
);
707 /* Apply a function to a list of arguments.
709 This function's interface is a bit wonly. It takes two required
710 arguments and a tail argument, as if it were:
712 (lambda (proc arg1 . args) ...)
714 Usually you want to use scm_apply_0 or one of its cousins. */
717 scm_apply (SCM proc
, SCM arg1
, SCM args
)
719 return scm_apply_0 (proc
,
720 scm_is_null (args
) ? arg1
: scm_cons_star (arg1
, args
));
724 prepare_boot_closure_env_for_apply (SCM proc
, SCM args
,
725 SCM
*out_body
, SCM
*out_env
)
727 int nreq
= BOOT_CLOSURE_NUM_REQUIRED_ARGS (proc
);
728 SCM env
= BOOT_CLOSURE_ENV (proc
);
731 if (BOOT_CLOSURE_IS_FIXED (proc
)
732 || (BOOT_CLOSURE_IS_REST (proc
)
733 && !BOOT_CLOSURE_HAS_REST_ARGS (proc
)))
735 if (SCM_UNLIKELY (scm_ilength (args
) != nreq
))
736 scm_wrong_num_args (proc
);
738 env
= make_env (nreq
, SCM_UNDEFINED
, env
);
739 for (i
= 0; i
< nreq
; args
= CDR (args
), i
++)
740 env_set (env
, 0, i
, CAR (args
));
741 *out_body
= BOOT_CLOSURE_BODY (proc
);
744 else if (BOOT_CLOSURE_IS_REST (proc
))
746 if (SCM_UNLIKELY (scm_ilength (args
) < nreq
))
747 scm_wrong_num_args (proc
);
749 env
= make_env (nreq
+ 1, SCM_UNDEFINED
, env
);
750 for (i
= 0; i
< nreq
; args
= CDR (args
), i
++)
751 env_set (env
, 0, i
, CAR (args
));
752 env_set (env
, 0, i
++, args
);
754 *out_body
= BOOT_CLOSURE_BODY (proc
);
759 int i
, argc
, nreq
, nopt
, nenv
;
760 SCM body
, rest
, kw
, inits
, alt
;
761 SCM mx
= BOOT_CLOSURE_CODE (proc
);
764 BOOT_CLOSURE_PARSE_FULL (mx
, body
, nargs
, rest
, nopt
, kw
, inits
, alt
);
766 argc
= scm_ilength (args
);
769 if (scm_is_true (alt
))
775 scm_wrong_num_args (proc
);
777 if (scm_is_false (kw
) && argc
> nreq
+ nopt
&& scm_is_false (rest
))
779 if (scm_is_true (alt
))
785 scm_wrong_num_args (proc
);
787 if (scm_is_true (kw
) && scm_is_false (rest
))
791 for (walk
= args
; scm_is_pair (walk
); walk
= CDR (walk
), npos
++)
792 if (npos
>= nreq
&& scm_is_keyword (CAR (walk
)))
795 if (npos
> nreq
+ nopt
)
797 /* Too many positional args and no rest arg. */
798 if (scm_is_true (alt
))
804 scm_wrong_num_args (proc
);
808 /* At this point we are committed to the chosen clause. */
809 nenv
= nreq
+ (scm_is_true (rest
) ? 1 : 0) + scm_ilength (inits
);
810 env
= make_env (nenv
, SCM_UNDEFINED
, env
);
812 for (i
= 0; i
< nreq
; i
++, args
= CDR (args
))
813 env_set (env
, 0, i
, CAR (args
));
815 if (scm_is_false (kw
))
817 /* Optional args (possibly), but no keyword args. */
818 for (; i
< argc
&& i
< nreq
+ nopt
;
819 i
++, args
= CDR (args
), inits
= CDR (inits
))
820 env_set (env
, 0, i
, CAR (args
));
822 for (; i
< nreq
+ nopt
; i
++, inits
= CDR (inits
))
823 env_set (env
, 0, i
, EVAL1 (CAR (inits
), env
));
825 if (scm_is_true (rest
))
826 env_set (env
, 0, i
++, args
);
835 /* Optional args. As before, but stop at the first keyword. */
836 for (; i
< argc
&& i
< nreq
+ nopt
&& !scm_is_keyword (CAR (args
));
837 i
++, args
= CDR (args
), inits
= CDR (inits
))
838 env_set (env
, 0, i
, CAR (args
));
840 for (; i
< nreq
+ nopt
; i
++, inits
= CDR (inits
))
841 env_set (env
, 0, i
, EVAL1 (CAR (inits
), env
));
843 if (scm_is_true (rest
))
844 env_set (env
, 0, i
++, args
);
846 /* Parse keyword args. */
848 int kw_start_idx
= i
;
851 if (scm_is_pair (args
) && scm_is_pair (CDR (args
)))
852 for (; scm_is_pair (args
) && scm_is_pair (CDR (args
));
855 SCM k
= CAR (args
), v
= CADR (args
);
856 if (!scm_is_keyword (k
))
858 if (scm_is_true (rest
))
863 for (walk
= kw
; scm_is_pair (walk
); walk
= CDR (walk
))
864 if (scm_is_eq (k
, CAAR (walk
)))
866 env_set (env
, 0, SCM_I_INUM (CDAR (walk
)), v
);
870 if (scm_is_null (walk
) && scm_is_false (aok
))
871 error_unrecognized_keyword (proc
, k
);
873 if (scm_is_pair (args
) && scm_is_false (rest
))
874 error_invalid_keyword (proc
, CAR (args
));
876 /* Now fill in unbound values, evaluating init expressions in their
877 appropriate environment. */
878 for (i
= kw_start_idx
; scm_is_pair (inits
); i
++, inits
= CDR (inits
))
879 if (SCM_UNBNDP (env_ref (env
, 0, i
)))
880 env_set (env
, 0, i
, EVAL1 (CAR (inits
), env
));
884 if (!scm_is_null (inits
))
895 prepare_boot_closure_env_for_eval (SCM proc
, unsigned int argc
,
896 SCM exps
, SCM
*out_body
, SCM
*inout_env
)
898 int nreq
= BOOT_CLOSURE_NUM_REQUIRED_ARGS (proc
);
899 SCM new_env
= BOOT_CLOSURE_ENV (proc
);
900 if ((BOOT_CLOSURE_IS_FIXED (proc
)
901 || (BOOT_CLOSURE_IS_REST (proc
)
902 && !BOOT_CLOSURE_HAS_REST_ARGS (proc
)))
907 new_env
= make_env (nreq
, SCM_UNDEFINED
, new_env
);
908 for (i
= 0; i
< nreq
; exps
= CDR (exps
), i
++)
909 env_set (new_env
, 0, i
, EVAL1 (CAR (exps
), *inout_env
));
911 *out_body
= BOOT_CLOSURE_BODY (proc
);
912 *inout_env
= new_env
;
914 else if (BOOT_CLOSURE_IS_REST (proc
) && argc
>= nreq
)
919 new_env
= make_env (nreq
+ 1, SCM_UNDEFINED
, new_env
);
920 for (i
= 0; i
< nreq
; exps
= CDR (exps
), i
++)
921 env_set (new_env
, 0, i
, EVAL1 (CAR (exps
), *inout_env
));
922 for (rest
= SCM_EOL
; scm_is_pair (exps
); exps
= CDR (exps
))
923 rest
= scm_cons (EVAL1 (CAR (exps
), *inout_env
), rest
);
924 env_set (new_env
, 0, i
++, scm_reverse_x (rest
, SCM_UNDEFINED
));
926 *out_body
= BOOT_CLOSURE_BODY (proc
);
927 *inout_env
= new_env
;
932 for (; scm_is_pair (exps
); exps
= CDR (exps
))
933 args
= scm_cons (EVAL1 (CAR (exps
), *inout_env
), args
);
934 args
= scm_reverse_x (args
, SCM_UNDEFINED
);
935 prepare_boot_closure_env_for_apply (proc
, args
, out_body
, inout_env
);
940 boot_closure_apply (SCM closure
, SCM args
)
943 prepare_boot_closure_env_for_apply (closure
, args
, &body
, &env
);
944 return eval (body
, env
);
948 boot_closure_print (SCM closure
, SCM port
, scm_print_state
*pstate
)
951 scm_puts_unlocked ("#<boot-closure ", port
);
952 scm_uintprint (SCM_UNPACK (closure
), 16, port
);
953 scm_putc_unlocked (' ', port
);
954 args
= scm_make_list (scm_from_int (BOOT_CLOSURE_NUM_REQUIRED_ARGS (closure
)),
955 scm_from_latin1_symbol ("_"));
956 if (!BOOT_CLOSURE_IS_FIXED (closure
) && BOOT_CLOSURE_HAS_REST_ARGS (closure
))
957 args
= scm_cons_star (scm_from_latin1_symbol ("_"), args
);
958 /* FIXME: optionals and rests */
959 scm_display (args
, port
);
960 scm_putc_unlocked ('>', port
);
969 f_apply
= scm_c_define_gsubr ("apply", 2, 0, 1, scm_apply
);
971 scm_tc16_boot_closure
= scm_make_smob_type ("boot-closure", 0);
972 scm_set_smob_apply (scm_tc16_boot_closure
, boot_closure_apply
, 0, 0, 1);
973 scm_set_smob_print (scm_tc16_boot_closure
, boot_closure_print
);
975 primitive_eval
= scm_c_make_gsubr ("primitive-eval", 1, 0, 0,
976 scm_c_primitive_eval
);
977 var_primitive_eval
= scm_define (SCM_SUBR_NAME (primitive_eval
),
980 #include "libguile/eval.x"