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_c_vm_run (scm_the_vm (), 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
);
450 vp
= SCM_VM_DATA (scm_the_vm ());
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. */
466 vp
= SCM_VM_DATA (scm_the_vm ());
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_c_vm_run (scm_the_vm (), proc
, NULL
, 0);
493 scm_call_1 (SCM proc
, SCM arg1
)
495 return scm_c_vm_run (scm_the_vm (), proc
, &arg1
, 1);
499 scm_call_2 (SCM proc
, SCM arg1
, SCM arg2
)
501 SCM args
[] = { arg1
, arg2
};
502 return scm_c_vm_run (scm_the_vm (), proc
, args
, 2);
506 scm_call_3 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
)
508 SCM args
[] = { arg1
, arg2
, arg3
};
509 return scm_c_vm_run (scm_the_vm (), 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_c_vm_run (scm_the_vm (), 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_c_vm_run (scm_the_vm (), 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_c_vm_run (scm_the_vm (), 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_c_vm_run (scm_the_vm (), 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_c_vm_run (scm_the_vm (), 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_c_vm_run (scm_the_vm (), proc
, args
, 9);
559 scm_call_n (SCM proc
, SCM
*argv
, size_t nargs
)
561 return scm_c_vm_run (scm_the_vm (), proc
, argv
, nargs
);
565 scm_call (SCM proc
, ...)
571 va_start (argp
, proc
);
572 while (!SCM_UNBNDP (va_arg (argp
, SCM
)))
576 argv
= alloca (nargs
* sizeof (SCM
));
577 va_start (argp
, proc
);
578 for (i
= 0; i
< nargs
; i
++)
579 argv
[i
] = va_arg (argp
, SCM
);
582 return scm_c_vm_run (scm_the_vm (), proc
, argv
, nargs
);
585 /* Simple procedure applies
589 scm_apply_0 (SCM proc
, SCM args
)
594 nargs
= scm_ilength (args
);
595 if (SCM_UNLIKELY (nargs
< 0))
596 scm_wrong_type_arg_msg ("apply", 2, args
, "list");
598 /* FIXME: Use vm_builtin_apply instead of alloca. */
599 argv
= alloca (nargs
* sizeof(SCM
));
600 for (i
= 0; i
< nargs
; i
++)
602 argv
[i
] = SCM_CAR (args
);
603 args
= SCM_CDR (args
);
606 return scm_c_vm_run (scm_the_vm (), proc
, argv
, nargs
);
610 scm_apply_1 (SCM proc
, SCM arg1
, SCM args
)
612 return scm_apply_0 (proc
, scm_cons (arg1
, args
));
616 scm_apply_2 (SCM proc
, SCM arg1
, SCM arg2
, SCM args
)
618 return scm_apply_0 (proc
, scm_cons2 (arg1
, arg2
, args
));
622 scm_apply_3 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM args
)
624 return scm_apply_0 (proc
, scm_cons (arg1
, scm_cons2 (arg2
, arg3
, args
)));
629 scm_map (SCM proc
, SCM arg1
, SCM args
)
631 static SCM var
= SCM_BOOL_F
;
633 if (scm_is_false (var
))
634 var
= scm_private_variable (scm_the_root_module (),
635 scm_from_latin1_symbol ("map"));
637 return scm_apply_0 (scm_variable_ref (var
),
638 scm_cons (proc
, scm_cons (arg1
, args
)));
642 scm_for_each (SCM proc
, SCM arg1
, SCM args
)
644 static SCM var
= SCM_BOOL_F
;
646 if (scm_is_false (var
))
647 var
= scm_private_variable (scm_the_root_module (),
648 scm_from_latin1_symbol ("for-each"));
650 return scm_apply_0 (scm_variable_ref (var
),
651 scm_cons (proc
, scm_cons (arg1
, args
)));
656 scm_c_primitive_eval (SCM exp
)
658 if (!SCM_EXPANDED_P (exp
))
659 exp
= scm_call_1 (scm_current_module_transformer (), exp
);
660 return eval (scm_memoize_expression (exp
), SCM_BOOL_F
);
663 static SCM var_primitive_eval
;
665 scm_primitive_eval (SCM exp
)
667 return scm_c_vm_run (scm_the_vm (), scm_variable_ref (var_primitive_eval
),
672 /* Eval does not take the second arg optionally. This is intentional
673 * in order to be R5RS compatible, and to prepare for the new module
674 * system, where we would like to make the choice of evaluation
675 * environment explicit. */
677 SCM_DEFINE (scm_eval
, "eval", 2, 0, 0,
678 (SCM exp
, SCM module_or_state
),
679 "Evaluate @var{exp}, a list representing a Scheme expression,\n"
680 "in the top-level environment specified by\n"
681 "@var{module_or_state}.\n"
682 "While @var{exp} is evaluated (using @code{primitive-eval}),\n"
683 "@var{module_or_state} is made the current module when\n"
684 "it is a module, or the current dynamic state when it is\n"
686 "Example: (eval '(+ 1 2) (interaction-environment))")
687 #define FUNC_NAME s_scm_eval
691 scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE
);
692 if (scm_is_dynamic_state (module_or_state
))
693 scm_dynwind_current_dynamic_state (module_or_state
);
694 else if (scm_module_system_booted_p
)
696 SCM_VALIDATE_MODULE (2, module_or_state
);
697 scm_dynwind_current_module (module_or_state
);
699 /* otherwise if the module system isn't booted, ignore the module arg */
701 res
= scm_primitive_eval (exp
);
711 /* Apply a function to a list of arguments.
713 This function's interface is a bit wonly. It takes two required
714 arguments and a tail argument, as if it were:
716 (lambda (proc arg1 . args) ...)
718 Usually you want to use scm_apply_0 or one of its cousins. */
721 scm_apply (SCM proc
, SCM arg1
, SCM args
)
723 return scm_apply_0 (proc
,
724 scm_is_null (args
) ? arg1
: scm_cons_star (arg1
, args
));
728 prepare_boot_closure_env_for_apply (SCM proc
, SCM args
,
729 SCM
*out_body
, SCM
*out_env
)
731 int nreq
= BOOT_CLOSURE_NUM_REQUIRED_ARGS (proc
);
732 SCM env
= BOOT_CLOSURE_ENV (proc
);
735 if (BOOT_CLOSURE_IS_FIXED (proc
)
736 || (BOOT_CLOSURE_IS_REST (proc
)
737 && !BOOT_CLOSURE_HAS_REST_ARGS (proc
)))
739 if (SCM_UNLIKELY (scm_ilength (args
) != nreq
))
740 scm_wrong_num_args (proc
);
742 env
= make_env (nreq
, SCM_UNDEFINED
, env
);
743 for (i
= 0; i
< nreq
; args
= CDR (args
), i
++)
744 env_set (env
, 0, i
, CAR (args
));
745 *out_body
= BOOT_CLOSURE_BODY (proc
);
748 else if (BOOT_CLOSURE_IS_REST (proc
))
750 if (SCM_UNLIKELY (scm_ilength (args
) < nreq
))
751 scm_wrong_num_args (proc
);
753 env
= make_env (nreq
+ 1, SCM_UNDEFINED
, env
);
754 for (i
= 0; i
< nreq
; args
= CDR (args
), i
++)
755 env_set (env
, 0, i
, CAR (args
));
756 env_set (env
, 0, i
++, args
);
758 *out_body
= BOOT_CLOSURE_BODY (proc
);
763 int i
, argc
, nreq
, nopt
, nenv
;
764 SCM body
, rest
, kw
, inits
, alt
;
765 SCM mx
= BOOT_CLOSURE_CODE (proc
);
768 BOOT_CLOSURE_PARSE_FULL (mx
, body
, nargs
, rest
, nopt
, kw
, inits
, alt
);
770 argc
= scm_ilength (args
);
773 if (scm_is_true (alt
))
779 scm_wrong_num_args (proc
);
781 if (scm_is_false (kw
) && argc
> nreq
+ nopt
&& scm_is_false (rest
))
783 if (scm_is_true (alt
))
789 scm_wrong_num_args (proc
);
791 if (scm_is_true (kw
) && scm_is_false (rest
))
795 for (walk
= args
; scm_is_pair (walk
); walk
= CDR (walk
), npos
++)
796 if (npos
>= nreq
&& scm_is_keyword (CAR (walk
)))
799 if (npos
> nreq
+ nopt
)
801 /* Too many positional args and no rest arg. */
802 if (scm_is_true (alt
))
808 scm_wrong_num_args (proc
);
812 /* At this point we are committed to the chosen clause. */
813 nenv
= nreq
+ (scm_is_true (rest
) ? 1 : 0) + scm_ilength (inits
);
814 env
= make_env (nenv
, SCM_UNDEFINED
, env
);
816 for (i
= 0; i
< nreq
; i
++, args
= CDR (args
))
817 env_set (env
, 0, i
, CAR (args
));
819 if (scm_is_false (kw
))
821 /* Optional args (possibly), but no keyword args. */
822 for (; i
< argc
&& i
< nreq
+ nopt
;
823 i
++, args
= CDR (args
), inits
= CDR (inits
))
824 env_set (env
, 0, i
, CAR (args
));
826 for (; i
< nreq
+ nopt
; i
++, inits
= CDR (inits
))
827 env_set (env
, 0, i
, EVAL1 (CAR (inits
), env
));
829 if (scm_is_true (rest
))
830 env_set (env
, 0, i
++, args
);
839 /* Optional args. As before, but stop at the first keyword. */
840 for (; i
< argc
&& i
< nreq
+ nopt
&& !scm_is_keyword (CAR (args
));
841 i
++, args
= CDR (args
), inits
= CDR (inits
))
842 env_set (env
, 0, i
, CAR (args
));
844 for (; i
< nreq
+ nopt
; i
++, inits
= CDR (inits
))
845 env_set (env
, 0, i
, EVAL1 (CAR (inits
), env
));
847 if (scm_is_true (rest
))
848 env_set (env
, 0, i
++, args
);
850 /* Parse keyword args. */
852 int kw_start_idx
= i
;
855 if (scm_is_pair (args
) && scm_is_pair (CDR (args
)))
856 for (; scm_is_pair (args
) && scm_is_pair (CDR (args
));
859 SCM k
= CAR (args
), v
= CADR (args
);
860 if (!scm_is_keyword (k
))
862 if (scm_is_true (rest
))
867 for (walk
= kw
; scm_is_pair (walk
); walk
= CDR (walk
))
868 if (scm_is_eq (k
, CAAR (walk
)))
870 env_set (env
, 0, SCM_I_INUM (CDAR (walk
)), v
);
874 if (scm_is_null (walk
) && scm_is_false (aok
))
875 error_unrecognized_keyword (proc
, k
);
877 if (scm_is_pair (args
) && scm_is_false (rest
))
878 error_invalid_keyword (proc
, CAR (args
));
880 /* Now fill in unbound values, evaluating init expressions in their
881 appropriate environment. */
882 for (i
= kw_start_idx
; scm_is_pair (inits
); i
++, inits
= CDR (inits
))
883 if (SCM_UNBNDP (env_ref (env
, 0, i
)))
884 env_set (env
, 0, i
, EVAL1 (CAR (inits
), env
));
888 if (!scm_is_null (inits
))
899 prepare_boot_closure_env_for_eval (SCM proc
, unsigned int argc
,
900 SCM exps
, SCM
*out_body
, SCM
*inout_env
)
902 int nreq
= BOOT_CLOSURE_NUM_REQUIRED_ARGS (proc
);
903 SCM new_env
= BOOT_CLOSURE_ENV (proc
);
904 if ((BOOT_CLOSURE_IS_FIXED (proc
)
905 || (BOOT_CLOSURE_IS_REST (proc
)
906 && !BOOT_CLOSURE_HAS_REST_ARGS (proc
)))
911 new_env
= make_env (nreq
, SCM_UNDEFINED
, new_env
);
912 for (i
= 0; i
< nreq
; exps
= CDR (exps
), i
++)
913 env_set (new_env
, 0, i
, EVAL1 (CAR (exps
), *inout_env
));
915 *out_body
= BOOT_CLOSURE_BODY (proc
);
916 *inout_env
= new_env
;
918 else if (BOOT_CLOSURE_IS_REST (proc
) && argc
>= nreq
)
923 new_env
= make_env (nreq
+ 1, SCM_UNDEFINED
, new_env
);
924 for (i
= 0; i
< nreq
; exps
= CDR (exps
), i
++)
925 env_set (new_env
, 0, i
, EVAL1 (CAR (exps
), *inout_env
));
926 for (rest
= SCM_EOL
; scm_is_pair (exps
); exps
= CDR (exps
))
927 rest
= scm_cons (EVAL1 (CAR (exps
), *inout_env
), rest
);
928 env_set (new_env
, 0, i
++, scm_reverse_x (rest
, SCM_UNDEFINED
));
930 *out_body
= BOOT_CLOSURE_BODY (proc
);
931 *inout_env
= new_env
;
936 for (; scm_is_pair (exps
); exps
= CDR (exps
))
937 args
= scm_cons (EVAL1 (CAR (exps
), *inout_env
), args
);
938 args
= scm_reverse_x (args
, SCM_UNDEFINED
);
939 prepare_boot_closure_env_for_apply (proc
, args
, out_body
, inout_env
);
944 boot_closure_apply (SCM closure
, SCM args
)
947 prepare_boot_closure_env_for_apply (closure
, args
, &body
, &env
);
948 return eval (body
, env
);
952 boot_closure_print (SCM closure
, SCM port
, scm_print_state
*pstate
)
955 scm_puts_unlocked ("#<boot-closure ", port
);
956 scm_uintprint (SCM_UNPACK (closure
), 16, port
);
957 scm_putc_unlocked (' ', port
);
958 args
= scm_make_list (scm_from_int (BOOT_CLOSURE_NUM_REQUIRED_ARGS (closure
)),
959 scm_from_latin1_symbol ("_"));
960 if (!BOOT_CLOSURE_IS_FIXED (closure
) && BOOT_CLOSURE_HAS_REST_ARGS (closure
))
961 args
= scm_cons_star (scm_from_latin1_symbol ("_"), args
);
962 /* FIXME: optionals and rests */
963 scm_display (args
, port
);
964 scm_putc_unlocked ('>', port
);
973 f_apply
= scm_c_define_gsubr ("apply", 2, 0, 1, scm_apply
);
975 scm_tc16_boot_closure
= scm_make_smob_type ("boot-closure", 0);
976 scm_set_smob_apply (scm_tc16_boot_closure
, boot_closure_apply
, 0, 0, 1);
977 scm_set_smob_print (scm_tc16_boot_closure
, boot_closure_print
);
979 primitive_eval
= scm_c_make_gsubr ("primitive-eval", 1, 0, 0,
980 scm_c_primitive_eval
);
981 var_primitive_eval
= scm_define (SCM_SUBR_NAME (primitive_eval
),
984 #include "libguile/eval.x"