1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2, or (at your option)
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this software; see the file COPYING. If not, write to
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
21 * The exception is that, if you link the GUILE library with other files
22 * to produce an executable, this does not by itself cause the
23 * resulting executable to be covered by the GNU General Public License.
24 * Your use of that executable is in no way restricted on account of
25 * linking the GUILE library code into it.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
30 * This exception applies only to the code released by the
31 * Free Software Foundation under the name GUILE. If you copy
32 * code from other Free Software Foundation releases into a copy of
33 * GUILE, as the General Public License permits, the exception does
34 * not apply to the code that you add in this way. To avoid misleading
35 * anyone as to the status of such modified files, you must delete
36 * this exception notice from them.
38 * If you write modifications of your own for GUILE, it is your choice
39 * whether to permit this exception to apply to your modifications.
40 * If you do not wish that, delete this exception notice. */
44 /* This file is read twice in order to produce debugging versions of
45 * scm_ceval and scm_apply. These functions, scm_deval and
46 * scm_dapply, are produced when we define the preprocessor macro
47 * DEVAL. The file is divided into sections which are treated
48 * differently with respect to DEVAL. The heads of these sections are
49 * marked with the string "SECTION:".
52 /* SECTION: This code is compiled once.
57 /* We need this to get the definitions for HAVE_ALLOCA_H, etc. */
58 #include "libguile/scmconfig.h"
60 /* AIX requires this to be the first thing in the file. The #pragma
61 directive is indented so pre-ANSI compilers will ignore it, rather
70 # ifndef alloca /* predefined by HP cc +Olibcalls */
77 #include "libguile/_scm.h"
78 #include "libguile/debug.h"
79 #include "libguile/dynwind.h"
80 #include "libguile/alist.h"
81 #include "libguile/eq.h"
82 #include "libguile/continuations.h"
83 #include "libguile/throw.h"
84 #include "libguile/smob.h"
85 #include "libguile/macros.h"
86 #include "libguile/procprop.h"
87 #include "libguile/hashtab.h"
88 #include "libguile/hash.h"
89 #include "libguile/srcprop.h"
90 #include "libguile/stackchk.h"
91 #include "libguile/objects.h"
92 #include "libguile/async.h"
93 #include "libguile/feature.h"
94 #include "libguile/modules.h"
95 #include "libguile/ports.h"
96 #include "libguile/root.h"
97 #include "libguile/vectors.h"
98 #include "libguile/fluids.h"
99 #include "libguile/values.h"
101 #include "libguile/validate.h"
102 #include "libguile/eval.h"
103 #include "libguile/lang.h"
107 #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \
109 if (SCM_EQ_P ((x), SCM_EOL)) \
110 scm_misc_error (NULL, scm_s_expression, SCM_EOL); \
115 /* The evaluator contains a plethora of EVAL symbols.
116 * This is an attempt at explanation.
118 * The following macros should be used in code which is read twice
119 * (where the choice of evaluator is hard soldered):
121 * SCM_CEVAL is the symbol used within one evaluator to call itself.
122 * Originally, it is defined to scm_ceval, but is redefined to
123 * scm_deval during the second pass.
125 * SIDEVAL corresponds to SCM_CEVAL, but is used in situations where
126 * only side effects of expressions matter. All immediates are
129 * SCM_EVALIM is used when it is known that the expression is an
130 * immediate. (This macro never calls an evaluator.)
132 * EVALCAR evaluates the car of an expression.
134 * EVALCELLCAR is like EVALCAR, but is used when it is known that the
135 * car is a lisp cell.
137 * The following macros should be used in code which is read once
138 * (where the choice of evaluator is dynamic):
140 * SCM_XEVAL takes care of immediates without calling an evaluator. It
141 * then calls scm_ceval *or* scm_deval, depending on the debugging
144 * SCM_XEVALCAR corresponds to EVALCAR, but uses scm_ceval *or* scm_deval
145 * depending on the debugging mode.
147 * The main motivation for keeping this plethora is efficiency
148 * together with maintainability (=> locality of code).
151 #define SCM_CEVAL scm_ceval
152 #define SIDEVAL(x, env) if (SCM_NIMP (x)) SCM_CEVAL((x), (env))
154 #define EVALCELLCAR(x, env) (SCM_SYMBOLP (SCM_CAR (x)) \
155 ? *scm_lookupcar (x, env, 1) \
156 : SCM_CEVAL (SCM_CAR (x), env))
158 #define EVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \
159 ? SCM_EVALIM (SCM_CAR (x), env) \
160 : EVALCELLCAR (x, env))
162 #define EXTEND_ENV SCM_EXTEND_ENV
164 #ifdef MEMOIZE_LOCALS
167 scm_ilookup (SCM iloc
, SCM env
)
169 register long ir
= SCM_IFRAME (iloc
);
170 register SCM er
= env
;
171 for (; 0 != ir
; --ir
)
174 for (ir
= SCM_IDIST (iloc
); 0 != ir
; --ir
)
176 if (SCM_ICDRP (iloc
))
177 return SCM_CDRLOC (er
);
178 return SCM_CARLOC (SCM_CDR (er
));
184 /* The Lookup Car Race
187 Memoization of variables and special forms is done while executing
188 the code for the first time. As long as there is only one thread
189 everything is fine, but as soon as two threads execute the same
190 code concurrently `for the first time' they can come into conflict.
192 This memoization includes rewriting variable references into more
193 efficient forms and expanding macros. Furthermore, macro expansion
194 includes `compiling' special forms like `let', `cond', etc. into
195 tree-code instructions.
197 There shouldn't normally be a problem with memoizing local and
198 global variable references (into ilocs and variables), because all
199 threads will mutate the code in *exactly* the same way and (if I
200 read the C code correctly) it is not possible to observe a half-way
201 mutated cons cell. The lookup procedure can handle this
202 transparently without any critical sections.
204 It is different with macro expansion, because macro expansion
205 happens outside of the lookup procedure and can't be
206 undone. Therefore the lookup procedure can't cope with it. It has
207 to indicate failure when it detects a lost race and hope that the
208 caller can handle it. Luckily, it turns out that this is the case.
210 An example to illustrate this: Suppose that the following form will
211 be memoized concurrently by two threads
215 Let's first examine the lookup of X in the body. The first thread
216 decides that it has to find the symbol "x" in the environment and
217 starts to scan it. Then the other thread takes over and actually
218 overtakes the first. It looks up "x" and substitutes an
219 appropriate iloc for it. Now the first thread continues and
220 completes its lookup. It comes to exactly the same conclusions as
221 the second one and could - without much ado - just overwrite the
222 iloc with the same iloc.
224 But let's see what will happen when the race occurs while looking
225 up the symbol "let" at the start of the form. It could happen that
226 the second thread interrupts the lookup of the first thread and not
227 only substitutes a variable for it but goes right ahead and
228 replaces it with the compiled form (#@let* (x 12) x). Now, when
229 the first thread completes its lookup, it would replace the #@let*
230 with a variable containing the "let" binding, effectively reverting
231 the form to (let (x 12) x). This is wrong. It has to detect that
232 it has lost the race and the evaluator has to reconsider the
233 changed form completely.
235 This race condition could be resolved with some kind of traffic
236 light (like mutexes) around scm_lookupcar, but I think that it is
237 best to avoid them in this case. They would serialize memoization
238 completely and because lookup involves calling arbitrary Scheme
239 code (via the lookup-thunk), threads could be blocked for an
240 arbitrary amount of time or even deadlock. But with the current
241 solution a lot of unnecessary work is potentially done. */
243 /* SCM_LOOKUPCAR1 is was SCM_LOOKUPCAR used to be but is allowed to
244 return NULL to indicate a failed lookup due to some race conditions
245 between threads. This only happens when VLOC is the first cell of
246 a special form that will eventually be memoized (like `let', etc.)
247 In that case the whole lookup is bogus and the caller has to
248 reconsider the complete special form.
250 SCM_LOOKUPCAR is still there, of course. It just calls
251 SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR
252 should only be called when it is known that VLOC is not the first
253 pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check
254 for NULL. I think I've found the only places where this
257 #endif /* USE_THREADS */
259 SCM_SYMBOL (scm_unbound_variable_key
, "unbound-variable");
263 scm_lookupcar1 (SCM vloc
, SCM genv
, int check
)
266 scm_lookupcar (SCM vloc
, SCM genv
, int check
)
270 register SCM
*al
, fl
, var
= SCM_CAR (vloc
);
271 #ifdef MEMOIZE_LOCALS
272 register SCM iloc
= SCM_ILOC00
;
274 for (; SCM_NIMP (env
); env
= SCM_CDR (env
))
276 if (!SCM_CONSP (SCM_CAR (env
)))
278 al
= SCM_CARLOC (env
);
279 for (fl
= SCM_CAR (*al
); SCM_NIMP (fl
); fl
= SCM_CDR (fl
))
283 if (SCM_EQ_P (fl
, var
))
285 #ifdef MEMOIZE_LOCALS
287 if (! SCM_EQ_P (SCM_CAR (vloc
), var
))
290 SCM_SET_CELL_WORD_0 (vloc
, SCM_UNPACK (iloc
) + SCM_ICDR
);
292 return SCM_CDRLOC (*al
);
297 al
= SCM_CDRLOC (*al
);
298 if (SCM_EQ_P (SCM_CAR (fl
), var
))
300 #ifdef MEMOIZE_LOCALS
301 #ifndef SCM_RECKLESS /* letrec inits to SCM_UNDEFINED */
302 if (SCM_UNBNDP (SCM_CAR (*al
)))
309 if (!SCM_EQ_P (SCM_CAR (vloc
), var
))
312 SCM_SETCAR (vloc
, iloc
);
314 return SCM_CARLOC (*al
);
316 #ifdef MEMOIZE_LOCALS
317 iloc
= SCM_PACK (SCM_UNPACK (iloc
) + SCM_IDINC
);
320 #ifdef MEMOIZE_LOCALS
321 iloc
= SCM_PACK ((~SCM_IDSTMSK
) & (SCM_UNPACK(iloc
) + SCM_IFRINC
));
325 SCM top_thunk
, real_var
;
328 top_thunk
= SCM_CAR (env
); /* env now refers to a
329 top level env thunk */
333 top_thunk
= SCM_BOOL_F
;
334 real_var
= scm_sym2var (var
, top_thunk
, SCM_BOOL_F
);
335 if (SCM_FALSEP (real_var
))
339 if (!SCM_NULLP (env
) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var
)))
345 scm_error (scm_unbound_variable_key
, NULL
,
346 "Unbound variable: ~S",
347 scm_list_1 (var
), SCM_BOOL_F
);
349 scm_misc_error (NULL
, "Damaged environment: ~S",
354 /* A variable could not be found, but we shall
355 not throw an error. */
356 static SCM undef_object
= SCM_UNDEFINED
;
357 return &undef_object
;
363 if (!SCM_EQ_P (SCM_CAR (vloc
), var
))
365 /* Some other thread has changed the very cell we are working
366 on. In effect, it must have done our job or messed it up
369 var
= SCM_CAR (vloc
);
370 if (SCM_VARIABLEP (var
))
371 return SCM_VARIABLE_LOC (var
);
372 #ifdef MEMOIZE_LOCALS
373 if (SCM_ITAG7 (var
) == SCM_ITAG7 (SCM_ILOC00
))
374 return scm_ilookup (var
, genv
);
376 /* We can't cope with anything else than variables and ilocs. When
377 a special form has been memoized (i.e. `let' into `#@let') we
378 return NULL and expect the calling function to do the right
379 thing. For the evaluator, this means going back and redoing
380 the dispatch on the car of the form. */
383 #endif /* USE_THREADS */
385 SCM_SETCAR (vloc
, real_var
);
386 return SCM_VARIABLE_LOC (real_var
);
392 scm_lookupcar (SCM vloc
, SCM genv
, int check
)
394 SCM
*loc
= scm_lookupcar1 (vloc
, genv
, check
);
401 #define unmemocar scm_unmemocar
403 SCM_SYMBOL (sym_three_question_marks
, "???");
406 scm_unmemocar (SCM form
, SCM env
)
408 if (!SCM_CONSP (form
))
412 SCM c
= SCM_CAR (form
);
413 if (SCM_VARIABLEP (c
))
415 SCM sym
= scm_module_reverse_lookup (scm_env_module (env
), c
);
416 if (SCM_FALSEP (sym
))
417 sym
= sym_three_question_marks
;
418 SCM_SETCAR (form
, sym
);
420 #ifdef MEMOIZE_LOCALS
421 else if (SCM_ILOCP (c
))
423 unsigned long int ir
;
425 for (ir
= SCM_IFRAME (c
); ir
!= 0; --ir
)
427 env
= SCM_CAAR (env
);
428 for (ir
= SCM_IDIST (c
); ir
!= 0; --ir
)
430 SCM_SETCAR (form
, SCM_ICDRP (c
) ? env
: SCM_CAR (env
));
439 scm_eval_car (SCM pair
, SCM env
)
441 return SCM_XEVALCAR (pair
, env
);
446 * The following rewrite expressions and
447 * some memoized forms have different syntax
450 const char scm_s_expression
[] = "missing or extra expression";
451 const char scm_s_test
[] = "bad test";
452 const char scm_s_body
[] = "bad body";
453 const char scm_s_bindings
[] = "bad bindings";
454 const char scm_s_duplicate_bindings
[] = "duplicate bindings";
455 const char scm_s_variable
[] = "bad variable";
456 const char scm_s_clauses
[] = "bad or missing clauses";
457 const char scm_s_formals
[] = "bad formals";
458 const char scm_s_duplicate_formals
[] = "duplicate formals";
459 static const char s_splicing
[] = "bad (non-list) result for unquote-splicing";
461 SCM_GLOBAL_SYMBOL (scm_sym_dot
, ".");
462 SCM_GLOBAL_SYMBOL (scm_sym_arrow
, "=>");
463 SCM_GLOBAL_SYMBOL (scm_sym_else
, "else");
464 SCM_GLOBAL_SYMBOL (scm_sym_unquote
, "unquote");
465 SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing
, "unquote-splicing");
469 #ifdef DEBUG_EXTENSIONS
470 SCM_GLOBAL_SYMBOL (scm_sym_enter_frame
, "enter-frame");
471 SCM_GLOBAL_SYMBOL (scm_sym_apply_frame
, "apply-frame");
472 SCM_GLOBAL_SYMBOL (scm_sym_exit_frame
, "exit-frame");
473 SCM_GLOBAL_SYMBOL (scm_sym_trace
, "trace");
477 /* Check that the body denoted by XORIG is valid and rewrite it into
478 its internal form. The internal form of a body is just the body
479 itself, but prefixed with an ISYM that denotes to what kind of
480 outer construct this body belongs. A lambda body starts with
481 SCM_IM_LAMBDA, for example, a body of a let starts with SCM_IM_LET,
482 etc. The one exception is a body that belongs to a letrec that has
483 been formed by rewriting internal defines: it starts with
486 /* XXX - Besides controlling the rewriting of internal defines, the
487 additional ISYM could be used for improved error messages.
488 This is not done yet. */
491 scm_m_body (SCM op
, SCM xorig
, const char *what
)
493 SCM_ASSYNT (scm_ilength (xorig
) >= 1, scm_s_body
, what
);
495 /* Don't add another ISYM if one is present already. */
496 if (SCM_ISYMP (SCM_CAR (xorig
)))
499 /* Retain possible doc string. */
500 if (!SCM_CONSP (SCM_CAR (xorig
)))
502 if (!SCM_NULLP (SCM_CDR (xorig
)))
503 return scm_cons (SCM_CAR (xorig
),
504 scm_m_body (op
, SCM_CDR (xorig
), what
));
508 return scm_cons (op
, xorig
);
512 SCM_SYNTAX (s_quote
, "quote", scm_makmmacro
, scm_m_quote
);
513 SCM_GLOBAL_SYMBOL (scm_sym_quote
, s_quote
);
516 scm_m_quote (SCM xorig
, SCM env SCM_UNUSED
)
518 SCM_ASSYNT (scm_ilength (SCM_CDR (xorig
)) == 1, scm_s_expression
, s_quote
);
519 return scm_cons (SCM_IM_QUOTE
, SCM_CDR (xorig
));
523 SCM_SYNTAX (s_begin
, "begin", scm_makmmacro
, scm_m_begin
);
524 SCM_GLOBAL_SYMBOL (scm_sym_begin
, s_begin
);
527 scm_m_begin (SCM xorig
, SCM env SCM_UNUSED
)
529 SCM_ASSYNT (scm_ilength (SCM_CDR (xorig
)) >= 0, scm_s_expression
, s_begin
);
530 return scm_cons (SCM_IM_BEGIN
, SCM_CDR (xorig
));
534 SCM_SYNTAX (s_if
, "if", scm_makmmacro
, scm_m_if
);
535 SCM_GLOBAL_SYMBOL (scm_sym_if
, s_if
);
538 scm_m_if (SCM xorig
, SCM env SCM_UNUSED
)
540 long len
= scm_ilength (SCM_CDR (xorig
));
541 SCM_ASSYNT (len
>= 2 && len
<= 3, scm_s_expression
, s_if
);
542 return scm_cons (SCM_IM_IF
, SCM_CDR (xorig
));
546 /* Will go into the RnRS module when Guile is factorized.
547 SCM_SYNTAX (scm_s_set_x,"set!", scm_makmmacro, scm_m_set_x); */
548 const char scm_s_set_x
[] = "set!";
549 SCM_GLOBAL_SYMBOL (scm_sym_set_x
, scm_s_set_x
);
552 scm_m_set_x (SCM xorig
, SCM env SCM_UNUSED
)
554 SCM x
= SCM_CDR (xorig
);
555 SCM_ASSYNT (scm_ilength (x
) == 2, scm_s_expression
, scm_s_set_x
);
556 SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (x
)), scm_s_variable
, scm_s_set_x
);
557 return scm_cons (SCM_IM_SET_X
, x
);
561 SCM_SYNTAX (s_and
, "and", scm_makmmacro
, scm_m_and
);
562 SCM_GLOBAL_SYMBOL (scm_sym_and
, s_and
);
565 scm_m_and (SCM xorig
, SCM env SCM_UNUSED
)
567 long len
= scm_ilength (SCM_CDR (xorig
));
568 SCM_ASSYNT (len
>= 0, scm_s_test
, s_and
);
570 return scm_cons (SCM_IM_AND
, SCM_CDR (xorig
));
576 SCM_SYNTAX (s_or
, "or", scm_makmmacro
, scm_m_or
);
577 SCM_GLOBAL_SYMBOL (scm_sym_or
, s_or
);
580 scm_m_or (SCM xorig
, SCM env SCM_UNUSED
)
582 long len
= scm_ilength (SCM_CDR (xorig
));
583 SCM_ASSYNT (len
>= 0, scm_s_test
, s_or
);
585 return scm_cons (SCM_IM_OR
, SCM_CDR (xorig
));
591 SCM_SYNTAX (s_case
, "case", scm_makmmacro
, scm_m_case
);
592 SCM_GLOBAL_SYMBOL (scm_sym_case
, s_case
);
595 scm_m_case (SCM xorig
, SCM env SCM_UNUSED
)
598 SCM cdrx
= SCM_CDR (xorig
);
599 SCM_ASSYNT (scm_ilength (cdrx
) >= 2, scm_s_clauses
, s_case
);
600 clauses
= SCM_CDR (cdrx
);
601 while (!SCM_NULLP (clauses
))
603 SCM clause
= SCM_CAR (clauses
);
604 SCM_ASSYNT (scm_ilength (clause
) >= 2, scm_s_clauses
, s_case
);
605 SCM_ASSYNT (scm_ilength (SCM_CAR (clause
)) >= 0
606 || (SCM_EQ_P (scm_sym_else
, SCM_CAR (clause
))
607 && SCM_NULLP (SCM_CDR (clauses
))),
608 scm_s_clauses
, s_case
);
609 clauses
= SCM_CDR (clauses
);
611 return scm_cons (SCM_IM_CASE
, cdrx
);
615 SCM_SYNTAX (s_cond
, "cond", scm_makmmacro
, scm_m_cond
);
616 SCM_GLOBAL_SYMBOL (scm_sym_cond
, s_cond
);
619 scm_m_cond (SCM xorig
, SCM env SCM_UNUSED
)
621 SCM cdrx
= SCM_CDR (xorig
);
623 SCM_ASSYNT (scm_ilength (clauses
) >= 1, scm_s_clauses
, s_cond
);
624 while (!SCM_NULLP (clauses
))
626 SCM clause
= SCM_CAR (clauses
);
627 long len
= scm_ilength (clause
);
628 SCM_ASSYNT (len
>= 1, scm_s_clauses
, s_cond
);
629 if (SCM_EQ_P (scm_sym_else
, SCM_CAR (clause
)))
631 int last_clause_p
= SCM_NULLP (SCM_CDR (clauses
));
632 SCM_ASSYNT (len
>= 2 && last_clause_p
, "bad ELSE clause", s_cond
);
634 else if (len
>= 2 && SCM_EQ_P (scm_sym_arrow
, SCM_CADR (clause
)))
636 SCM_ASSYNT (len
> 2, "missing recipient", s_cond
);
637 SCM_ASSYNT (len
== 3, "bad recipient", s_cond
);
639 clauses
= SCM_CDR (clauses
);
641 return scm_cons (SCM_IM_COND
, cdrx
);
645 SCM_SYNTAX (s_lambda
, "lambda", scm_makmmacro
, scm_m_lambda
);
646 SCM_GLOBAL_SYMBOL (scm_sym_lambda
, s_lambda
);
648 /* Return true if OBJ is `eq?' to one of the elements of LIST or to the
649 * cdr of the last cons. (Thus, LIST is not required to be a proper
650 * list and OBJ can also be found in the improper ending.) */
652 scm_c_improper_memq (SCM obj
, SCM list
)
654 for (; SCM_CONSP (list
); list
= SCM_CDR (list
))
656 if (SCM_EQ_P (SCM_CAR (list
), obj
))
659 return SCM_EQ_P (list
, obj
);
663 scm_m_lambda (SCM xorig
, SCM env SCM_UNUSED
)
666 SCM x
= SCM_CDR (xorig
);
668 SCM_ASSYNT (SCM_CONSP (x
), scm_s_formals
, s_lambda
);
670 formals
= SCM_CAR (x
);
671 while (SCM_CONSP (formals
))
673 SCM formal
= SCM_CAR (formals
);
674 SCM_ASSYNT (SCM_SYMBOLP (formal
), scm_s_formals
, s_lambda
);
675 if (scm_c_improper_memq (formal
, SCM_CDR (formals
)))
676 scm_misc_error (s_lambda
, scm_s_duplicate_formals
, SCM_EOL
);
677 formals
= SCM_CDR (formals
);
679 if (!SCM_NULLP (formals
) && !SCM_SYMBOLP (formals
))
680 scm_misc_error (s_lambda
, scm_s_formals
, SCM_EOL
);
682 return scm_cons2 (SCM_IM_LAMBDA
, SCM_CAR (x
),
683 scm_m_body (SCM_IM_LAMBDA
, SCM_CDR (x
), s_lambda
));
687 SCM_SYNTAX (s_letstar
, "let*", scm_makmmacro
, scm_m_letstar
);
688 SCM_GLOBAL_SYMBOL (scm_sym_letstar
, s_letstar
);
690 /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vk and initializers
691 * i1 .. ik is transformed into the form (#@let* (v1 i1 v2 i2 ...) body*). */
693 scm_m_letstar (SCM xorig
, SCM env SCM_UNUSED
)
696 SCM x
= SCM_CDR (xorig
);
700 SCM_ASSYNT (SCM_CONSP (x
), scm_s_bindings
, s_letstar
);
702 bindings
= SCM_CAR (x
);
703 SCM_ASSYNT (scm_ilength (bindings
) >= 0, scm_s_bindings
, s_letstar
);
704 while (!SCM_NULLP (bindings
))
706 SCM binding
= SCM_CAR (bindings
);
707 SCM_ASSYNT (scm_ilength (binding
) == 2, scm_s_bindings
, s_letstar
);
708 SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding
)), scm_s_variable
, s_letstar
);
709 *varloc
= scm_list_2 (SCM_CAR (binding
), SCM_CADR (binding
));
710 varloc
= SCM_CDRLOC (SCM_CDR (*varloc
));
711 bindings
= SCM_CDR (bindings
);
714 return scm_cons2 (SCM_IM_LETSTAR
, vars
,
715 scm_m_body (SCM_IM_LETSTAR
, SCM_CDR (x
), s_letstar
));
719 /* DO gets the most radically altered syntax. The order of the vars is
720 * reversed here. In contrast, the order of the inits and steps is reversed
721 * during the evaluation:
723 (do ((<var1> <init1> <step1>)
731 (#@do (varn ... var2 var1)
732 (<init1> <init2> ... <initn>)
735 <step1> <step2> ... <stepn>) ;; missing steps replaced by var
738 SCM_SYNTAX(s_do
, "do", scm_makmmacro
, scm_m_do
);
739 SCM_GLOBAL_SYMBOL(scm_sym_do
, s_do
);
742 scm_m_do (SCM xorig
, SCM env SCM_UNUSED
)
745 SCM x
= SCM_CDR (xorig
);
748 SCM
*initloc
= &inits
;
750 SCM
*steploc
= &steps
;
751 SCM_ASSYNT (scm_ilength (x
) >= 2, scm_s_test
, "do");
752 bindings
= SCM_CAR (x
);
753 SCM_ASSYNT (scm_ilength (bindings
) >= 0, scm_s_bindings
, "do");
754 while (!SCM_NULLP (bindings
))
756 SCM binding
= SCM_CAR (bindings
);
757 long len
= scm_ilength (binding
);
758 SCM_ASSYNT (len
== 2 || len
== 3, scm_s_bindings
, "do");
760 SCM name
= SCM_CAR (binding
);
761 SCM init
= SCM_CADR (binding
);
762 SCM step
= (len
== 2) ? name
: SCM_CADDR (binding
);
763 SCM_ASSYNT (SCM_SYMBOLP (name
), scm_s_variable
, "do");
764 vars
= scm_cons (name
, vars
);
765 *initloc
= scm_list_1 (init
);
766 initloc
= SCM_CDRLOC (*initloc
);
767 *steploc
= scm_list_1 (step
);
768 steploc
= SCM_CDRLOC (*steploc
);
769 bindings
= SCM_CDR (bindings
);
773 SCM_ASSYNT (scm_ilength (SCM_CAR (x
)) >= 1, scm_s_test
, "do");
774 x
= scm_cons2 (SCM_CAR (x
), SCM_CDR (x
), steps
);
775 x
= scm_cons2 (vars
, inits
, x
);
776 return scm_cons (SCM_IM_DO
, x
);
780 SCM_SYNTAX (s_quasiquote
, "quasiquote", scm_makacro
, scm_m_quasiquote
);
781 SCM_GLOBAL_SYMBOL (scm_sym_quasiquote
, s_quasiquote
);
783 /* Internal function to handle a quasiquotation: 'form' is the parameter in
784 * the call (quasiquotation form), 'env' is the environment where unquoted
785 * expressions will be evaluated, and 'depth' is the current quasiquotation
786 * nesting level and is known to be greater than zero. */
788 iqq (SCM form
, SCM env
, unsigned long int depth
)
790 if (SCM_CONSP (form
))
792 SCM tmp
= SCM_CAR (form
);
793 if (SCM_EQ_P (tmp
, scm_sym_quasiquote
))
795 SCM args
= SCM_CDR (form
);
796 SCM_ASSYNT (scm_ilength (args
) == 1, scm_s_expression
, s_quasiquote
);
797 return scm_list_2 (tmp
, iqq (SCM_CAR (args
), env
, depth
+ 1));
799 else if (SCM_EQ_P (tmp
, scm_sym_unquote
))
801 SCM args
= SCM_CDR (form
);
802 SCM_ASSYNT (scm_ilength (args
) == 1, scm_s_expression
, s_quasiquote
);
804 return scm_eval_car (args
, env
);
806 return scm_list_2 (tmp
, iqq (SCM_CAR (args
), env
, depth
- 1));
808 else if (SCM_CONSP (tmp
)
809 && SCM_EQ_P (SCM_CAR (tmp
), scm_sym_uq_splicing
))
811 SCM args
= SCM_CDR (tmp
);
812 SCM_ASSYNT (scm_ilength (args
) == 1, scm_s_expression
, s_quasiquote
);
815 SCM list
= scm_eval_car (args
, env
);
816 SCM rest
= SCM_CDR (form
);
817 SCM_ASSYNT (scm_ilength (list
) >= 0, s_splicing
, s_quasiquote
);
818 return scm_append (scm_list_2 (list
, iqq (rest
, env
, depth
)));
821 return scm_cons (iqq (SCM_CAR (form
), env
, depth
- 1),
822 iqq (SCM_CDR (form
), env
, depth
));
825 return scm_cons (iqq (SCM_CAR (form
), env
, depth
),
826 iqq (SCM_CDR (form
), env
, depth
));
828 else if (SCM_VECTORP (form
))
830 size_t i
= SCM_VECTOR_LENGTH (form
);
831 SCM
*data
= SCM_VELTS (form
);
834 tmp
= scm_cons (data
[--i
], tmp
);
835 scm_remember_upto_here_1 (form
);
836 return scm_vector (iqq (tmp
, env
, depth
));
843 scm_m_quasiquote (SCM xorig
, SCM env
)
845 SCM x
= SCM_CDR (xorig
);
846 SCM_ASSYNT (scm_ilength (x
) == 1, scm_s_expression
, s_quasiquote
);
847 return iqq (SCM_CAR (x
), env
, 1);
851 SCM_SYNTAX (s_delay
, "delay", scm_makmmacro
, scm_m_delay
);
852 SCM_GLOBAL_SYMBOL (scm_sym_delay
, s_delay
);
854 /* Promises are implemented as closures with an empty parameter list. Thus,
855 * (delay <expression>) is transformed into (#@delay '() <expression>), where
856 * the empty list represents the empty parameter list. This representation
857 * allows for easy creation of the closure during evaluation. */
859 scm_m_delay (SCM xorig
, SCM env SCM_UNUSED
)
861 SCM_ASSYNT (scm_ilength (xorig
) == 2, scm_s_expression
, s_delay
);
862 return scm_cons2 (SCM_IM_DELAY
, SCM_EOL
, SCM_CDR (xorig
));
866 SCM_SYNTAX(s_define
, "define", scm_makmmacro
, scm_m_define
);
867 SCM_GLOBAL_SYMBOL(scm_sym_define
, s_define
);
869 /* Guile provides an extension to R5RS' define syntax to represent function
870 * currying in a compact way. With this extension, it is allowed to write
871 * (define <nested-variable> <body>), where <nested-variable> has of one of
872 * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>),
873 * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals>
874 * should be either a sequence of zero or more variables, or a sequence of one
875 * or more variables followed by a space-delimited period and another
876 * variable. Each level of argument nesting wraps the <body> within another
877 * lambda expression. For example, the following forms are allowed, each one
878 * followed by an equivalent, more explicit implementation.
880 * (define ((a b . c) . d) <body>) is equivalent to
881 * (define a (lambda (b . c) (lambda d <body>)))
883 * (define (((a) b) c . d) <body>) is equivalent to
884 * (define a (lambda () (lambda (b) (lambda (c . d) <body>))))
886 /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS
887 * module that does not implement this extension. */
889 scm_m_define (SCM x
, SCM env
)
893 SCM_ASSYNT (scm_ilength (x
) >= 2, scm_s_expression
, s_define
);
896 while (SCM_CONSP (name
))
898 /* This while loop realizes function currying by variable nesting. */
899 SCM formals
= SCM_CDR (name
);
900 x
= scm_list_1 (scm_cons2 (scm_sym_lambda
, formals
, x
));
901 name
= SCM_CAR (name
);
903 SCM_ASSYNT (SCM_SYMBOLP (name
), scm_s_variable
, s_define
);
904 SCM_ASSYNT (scm_ilength (x
) == 1, scm_s_expression
, s_define
);
905 if (SCM_TOP_LEVEL (env
))
908 x
= scm_eval_car (x
, env
);
909 if (SCM_REC_PROCNAMES_P
)
912 while (SCM_MACROP (tmp
))
913 tmp
= SCM_MACRO_CODE (tmp
);
914 if (SCM_CLOSUREP (tmp
)
915 /* Only the first definition determines the name. */
916 && SCM_FALSEP (scm_procedure_property (tmp
, scm_sym_name
)))
917 scm_set_procedure_property_x (tmp
, scm_sym_name
, name
);
919 var
= scm_sym2var (name
, scm_env_top_level (env
), SCM_BOOL_T
);
920 SCM_VARIABLE_SET (var
, x
);
921 return SCM_UNSPECIFIED
;
924 return scm_cons2 (SCM_IM_DEFINE
, name
, x
);
928 /* The bindings ((v1 i1) (v2 i2) ... (vn in)) are transformed to the lists
929 * (vn ... v2 v1) and (i1 i2 ... in). That is, the list of variables is
930 * reversed here, the list of inits gets reversed during evaluation. */
932 transform_bindings (SCM bindings
, SCM
*rvarloc
, SCM
*initloc
, const char *what
)
938 SCM_ASSYNT (scm_ilength (bindings
) >= 1, scm_s_bindings
, what
);
942 SCM binding
= SCM_CAR (bindings
);
943 SCM_ASSYNT (scm_ilength (binding
) == 2, scm_s_bindings
, what
);
944 SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding
)), scm_s_variable
, what
);
945 if (scm_c_improper_memq (SCM_CAR (binding
), rvars
))
946 scm_misc_error (what
, scm_s_duplicate_bindings
, SCM_EOL
);
947 rvars
= scm_cons (SCM_CAR (binding
), rvars
);
948 *initloc
= scm_list_1 (SCM_CADR (binding
));
949 initloc
= SCM_CDRLOC (*initloc
);
950 bindings
= SCM_CDR (bindings
);
952 while (!SCM_NULLP (bindings
));
958 SCM_SYNTAX(s_letrec
, "letrec", scm_makmmacro
, scm_m_letrec
);
959 SCM_GLOBAL_SYMBOL(scm_sym_letrec
, s_letrec
);
962 scm_m_letrec (SCM xorig
, SCM env
)
964 SCM x
= SCM_CDR (xorig
);
965 SCM_ASSYNT (SCM_CONSP (x
), scm_s_bindings
, s_letrec
);
967 if (SCM_NULLP (SCM_CAR (x
)))
969 /* null binding, let* faster */
970 SCM body
= scm_m_body (SCM_IM_LETREC
, SCM_CDR (x
), s_letrec
);
971 return scm_m_letstar (scm_cons2 (SCM_CAR (xorig
), SCM_EOL
, body
), env
);
975 SCM rvars
, inits
, body
;
976 transform_bindings (SCM_CAR (x
), &rvars
, &inits
, "letrec");
977 body
= scm_m_body (SCM_IM_LETREC
, SCM_CDR (x
), "letrec");
978 return scm_cons2 (SCM_IM_LETREC
, rvars
, scm_cons (inits
, body
));
983 SCM_SYNTAX(s_let
, "let", scm_makmmacro
, scm_m_let
);
984 SCM_GLOBAL_SYMBOL(scm_sym_let
, s_let
);
987 scm_m_let (SCM xorig
, SCM env
)
989 SCM x
= SCM_CDR (xorig
);
992 SCM_ASSYNT (SCM_CONSP (x
), scm_s_bindings
, s_let
);
995 || (scm_ilength (temp
) == 1 && SCM_CONSP (SCM_CAR (temp
))))
997 /* null or single binding, let* is faster */
999 SCM body
= scm_m_body (SCM_IM_LET
, SCM_CDR (x
), s_let
);
1000 return scm_m_letstar (scm_cons2 (SCM_CAR (xorig
), bindings
, body
), env
);
1002 else if (SCM_CONSP (temp
))
1005 SCM bindings
= temp
;
1006 SCM rvars
, inits
, body
;
1007 transform_bindings (bindings
, &rvars
, &inits
, "let");
1008 body
= scm_m_body (SCM_IM_LET
, SCM_CDR (x
), "let");
1009 return scm_cons2 (SCM_IM_LET
, rvars
, scm_cons (inits
, body
));
1013 /* named let: Transform (let name ((var init) ...) body ...) into
1014 * ((letrec ((name (lambda (var ...) body ...))) name) init ...) */
1018 SCM
*varloc
= &vars
;
1019 SCM inits
= SCM_EOL
;
1020 SCM
*initloc
= &inits
;
1023 SCM_ASSYNT (SCM_SYMBOLP (name
), scm_s_bindings
, s_let
);
1025 SCM_ASSYNT (SCM_CONSP (x
), scm_s_bindings
, s_let
);
1026 bindings
= SCM_CAR (x
);
1027 SCM_ASSYNT (scm_ilength (bindings
) >= 0, scm_s_bindings
, s_let
);
1028 while (!SCM_NULLP (bindings
))
1029 { /* vars and inits both in order */
1030 SCM binding
= SCM_CAR (bindings
);
1031 SCM_ASSYNT (scm_ilength (binding
) == 2, scm_s_bindings
, s_let
);
1032 SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding
)), scm_s_variable
, s_let
);
1033 *varloc
= scm_list_1 (SCM_CAR (binding
));
1034 varloc
= SCM_CDRLOC (*varloc
);
1035 *initloc
= scm_list_1 (SCM_CADR (binding
));
1036 initloc
= SCM_CDRLOC (*initloc
);
1037 bindings
= SCM_CDR (bindings
);
1041 SCM lambda_body
= scm_m_body (SCM_IM_LET
, SCM_CDR (x
), "let");
1042 SCM lambda_form
= scm_cons2 (scm_sym_lambda
, vars
, lambda_body
);
1043 SCM rvar
= scm_list_1 (name
);
1044 SCM init
= scm_list_1 (lambda_form
);
1045 SCM body
= scm_m_body (SCM_IM_LET
, scm_list_1 (name
), "let");
1046 SCM letrec
= scm_cons2 (SCM_IM_LETREC
, rvar
, scm_cons (init
, body
));
1047 return scm_cons (letrec
, inits
);
1053 SCM_SYNTAX (s_atapply
,"@apply", scm_makmmacro
, scm_m_apply
);
1054 SCM_GLOBAL_SYMBOL (scm_sym_atapply
, s_atapply
);
1055 SCM_GLOBAL_SYMBOL (scm_sym_apply
, s_atapply
+ 1);
1058 scm_m_apply (SCM xorig
, SCM env SCM_UNUSED
)
1060 SCM_ASSYNT (scm_ilength (SCM_CDR (xorig
)) == 2, scm_s_expression
, s_atapply
);
1061 return scm_cons (SCM_IM_APPLY
, SCM_CDR (xorig
));
1065 SCM_SYNTAX(s_atcall_cc
,"@call-with-current-continuation", scm_makmmacro
, scm_m_cont
);
1066 SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc
,s_atcall_cc
);
1070 scm_m_cont (SCM xorig
, SCM env SCM_UNUSED
)
1072 SCM_ASSYNT (scm_ilength (SCM_CDR (xorig
)) == 1,
1073 scm_s_expression
, s_atcall_cc
);
1074 return scm_cons (SCM_IM_CONT
, SCM_CDR (xorig
));
1077 #ifdef SCM_ENABLE_ELISP
1079 SCM_SYNTAX (s_nil_cond
, "nil-cond", scm_makmmacro
, scm_m_nil_cond
);
1082 scm_m_nil_cond (SCM xorig
, SCM env SCM_UNUSED
)
1084 long len
= scm_ilength (SCM_CDR (xorig
));
1085 SCM_ASSYNT (len
>= 1 && (len
& 1) == 1, scm_s_expression
, "nil-cond");
1086 return scm_cons (SCM_IM_NIL_COND
, SCM_CDR (xorig
));
1089 SCM_SYNTAX (s_atfop
, "@fop", scm_makmmacro
, scm_m_atfop
);
1092 scm_m_atfop (SCM xorig
, SCM env SCM_UNUSED
)
1094 SCM x
= SCM_CDR (xorig
), var
;
1095 SCM_ASSYNT (scm_ilength (x
) >= 1, scm_s_expression
, "@fop");
1096 var
= scm_symbol_fref (SCM_CAR (x
));
1097 /* Passing the symbol name as the `subr' arg here isn't really
1098 right, but without it it can be very difficult to work out from
1099 the error message which function definition was missing. In any
1100 case, we shouldn't really use SCM_ASSYNT here at all, but instead
1101 something equivalent to (signal void-function (list SYM)) in
1103 SCM_ASSYNT (SCM_VARIABLEP (var
),
1104 "Symbol's function definition is void",
1105 SCM_SYMBOL_CHARS (SCM_CAR (x
)));
1106 /* Support `defalias'. */
1107 while (SCM_SYMBOLP (SCM_VARIABLE_REF (var
)))
1109 var
= scm_symbol_fref (SCM_VARIABLE_REF (var
));
1110 SCM_ASSYNT (SCM_VARIABLEP (var
),
1111 "Symbol's function definition is void",
1112 SCM_SYMBOL_CHARS (SCM_CAR (x
)));
1114 /* Use `var' here rather than `SCM_VARIABLE_REF (var)' because the
1115 former allows for automatically picking up redefinitions of the
1116 corresponding symbol. */
1117 SCM_SETCAR (x
, var
);
1118 /* If the variable contains a procedure, leave the
1119 `transformer-macro' in place so that the procedure's arguments
1120 get properly transformed, and change the initial @fop to
1122 if (!SCM_MACROP (SCM_VARIABLE_REF (var
)))
1124 SCM_SETCAR (xorig
, SCM_IM_APPLY
);
1127 /* Otherwise (the variable contains a macro), the arguments should
1128 not be transformed, so cut the `transformer-macro' out and return
1129 the resulting expression starting with the variable. */
1130 SCM_SETCDR (x
, SCM_CDADR (x
));
1134 #endif /* SCM_ENABLE_ELISP */
1136 /* (@bind ((var exp) ...) body ...)
1138 This will assign the values of the `exp's to the global variables
1139 named by `var's (symbols, not evaluated), creating them if they
1140 don't exist, executes body, and then restores the previous values of
1141 the `var's. Additionally, whenever control leaves body, the values
1142 of the `var's are saved and restored when control returns. It is an
1143 error when a symbol appears more than once among the `var's.
1144 All `exp's are evaluated before any `var' is set.
1146 Think of this as `let' for dynamic scope.
1148 It is memoized into (#@bind ((var ...) . (reversed-val ...)) body ...).
1150 XXX - also implement `@bind*'.
1153 SCM_SYNTAX (s_atbind
, "@bind", scm_makmmacro
, scm_m_atbind
);
1156 scm_m_atbind (SCM xorig
, SCM env
)
1158 SCM x
= SCM_CDR (xorig
);
1159 SCM top_level
= scm_env_top_level (env
);
1160 SCM vars
= SCM_EOL
, var
;
1163 SCM_ASSYNT (scm_ilength (x
) > 1, scm_s_expression
, s_atbind
);
1166 while (SCM_NIMP (x
))
1169 SCM sym_exp
= SCM_CAR (x
);
1170 SCM_ASSYNT (scm_ilength (sym_exp
) == 2, scm_s_bindings
, s_atbind
);
1171 SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (sym_exp
)), scm_s_bindings
, s_atbind
);
1173 for (rest
= x
; SCM_NIMP (rest
); rest
= SCM_CDR (rest
))
1174 if (SCM_EQ_P (SCM_CAR (sym_exp
), SCM_CAAR (rest
)))
1175 scm_misc_error (s_atbind
, scm_s_duplicate_bindings
, SCM_EOL
);
1176 /* The first call to scm_sym2var will look beyond the current
1177 module, while the second call wont. */
1178 var
= scm_sym2var (SCM_CAR (sym_exp
), top_level
, SCM_BOOL_F
);
1179 if (SCM_FALSEP (var
))
1180 var
= scm_sym2var (SCM_CAR (sym_exp
), top_level
, SCM_BOOL_T
);
1181 vars
= scm_cons (var
, vars
);
1182 exps
= scm_cons (SCM_CADR (sym_exp
), exps
);
1184 return scm_cons (SCM_IM_BIND
,
1185 scm_cons (scm_cons (scm_reverse_x (vars
, SCM_EOL
), exps
),
1189 SCM_SYNTAX (s_at_call_with_values
, "@call-with-values", scm_makmmacro
, scm_m_at_call_with_values
);
1190 SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values
, s_at_call_with_values
);
1193 scm_m_at_call_with_values (SCM xorig
, SCM env SCM_UNUSED
)
1195 SCM_ASSYNT (scm_ilength (SCM_CDR (xorig
)) == 2,
1196 scm_s_expression
, s_at_call_with_values
);
1197 return scm_cons (SCM_IM_CALL_WITH_VALUES
, SCM_CDR (xorig
));
1201 scm_m_expand_body (SCM xorig
, SCM env
)
1203 SCM x
= SCM_CDR (xorig
), defs
= SCM_EOL
;
1204 char *what
= SCM_ISYMCHARS (SCM_CAR (xorig
)) + 2;
1206 while (SCM_NIMP (x
))
1208 SCM form
= SCM_CAR (x
);
1209 if (!SCM_CONSP (form
))
1211 if (!SCM_SYMBOLP (SCM_CAR (form
)))
1214 form
= scm_macroexp (scm_cons_source (form
,
1219 if (SCM_EQ_P (SCM_IM_DEFINE
, SCM_CAR (form
)))
1221 defs
= scm_cons (SCM_CDR (form
), defs
);
1224 else if (!SCM_IMP (defs
))
1228 else if (SCM_EQ_P (SCM_IM_BEGIN
, SCM_CAR (form
)))
1230 x
= scm_append (scm_list_2 (SCM_CDR (form
), SCM_CDR (x
)));
1234 x
= scm_cons (form
, SCM_CDR (x
));
1239 if (!SCM_NULLP (defs
))
1241 SCM rvars
, inits
, body
, letrec
;
1242 transform_bindings (defs
, &rvars
, &inits
, what
);
1243 body
= scm_m_body (SCM_IM_DEFINE
, x
, what
);
1244 letrec
= scm_cons2 (SCM_IM_LETREC
, rvars
, scm_cons (inits
, body
));
1245 SCM_SETCAR (xorig
, letrec
);
1246 SCM_SETCDR (xorig
, SCM_EOL
);
1250 SCM_ASSYNT (SCM_CONSP (x
), scm_s_body
, what
);
1251 SCM_SETCAR (xorig
, SCM_CAR (x
));
1252 SCM_SETCDR (xorig
, SCM_CDR (x
));
1259 scm_macroexp (SCM x
, SCM env
)
1261 SCM res
, proc
, orig_sym
;
1263 /* Don't bother to produce error messages here. We get them when we
1264 eventually execute the code for real. */
1267 orig_sym
= SCM_CAR (x
);
1268 if (!SCM_SYMBOLP (orig_sym
))
1273 SCM
*proc_ptr
= scm_lookupcar1 (x
, env
, 0);
1274 if (proc_ptr
== NULL
)
1276 /* We have lost the race. */
1282 proc
= *scm_lookupcar (x
, env
, 0);
1285 /* Only handle memoizing macros. `Acros' and `macros' are really
1286 special forms and should not be evaluated here. */
1288 if (!SCM_MACROP (proc
) || SCM_MACRO_TYPE (proc
) != 2)
1291 SCM_SETCAR (x
, orig_sym
); /* Undo memoizing effect of lookupcar */
1292 res
= scm_call_2 (SCM_MACRO_CODE (proc
), x
, env
);
1294 if (scm_ilength (res
) <= 0)
1295 res
= scm_list_2 (SCM_IM_BEGIN
, res
);
1298 SCM_SETCAR (x
, SCM_CAR (res
));
1299 SCM_SETCDR (x
, SCM_CDR (res
));
1305 /* scm_unmemocopy takes a memoized expression together with its
1306 * environment and rewrites it to its original form. Thus, it is the
1307 * inversion of the rewrite rules above. The procedure is not
1308 * optimized for speed. It's used in scm_iprin1 when printing the
1309 * code of a closure, in scm_procedure_source, in display_frame when
1310 * generating the source for a stackframe in a backtrace, and in
1311 * display_expression.
1313 * Unmemoizing is not a reliable process. You cannot in general
1314 * expect to get the original source back.
1316 * However, GOOPS currently relies on this for method compilation.
1317 * This ought to change.
1320 #define SCM_BIT8(x) (127 & SCM_UNPACK (x))
1323 build_binding_list (SCM names
, SCM inits
)
1325 SCM bindings
= SCM_EOL
;
1326 while (!SCM_NULLP (names
))
1328 SCM binding
= scm_list_2 (SCM_CAR (names
), SCM_CAR (inits
));
1329 bindings
= scm_cons (binding
, bindings
);
1330 names
= SCM_CDR (names
);
1331 inits
= SCM_CDR (inits
);
1337 unmemocopy (SCM x
, SCM env
)
1340 #ifdef DEBUG_EXTENSIONS
1345 #ifdef DEBUG_EXTENSIONS
1346 p
= scm_whash_lookup (scm_source_whash
, x
);
1348 switch (SCM_ITAG7 (SCM_CAR (x
)))
1350 case SCM_BIT8(SCM_IM_AND
):
1351 ls
= z
= scm_cons (scm_sym_and
, SCM_UNSPECIFIED
);
1353 case SCM_BIT8(SCM_IM_BEGIN
):
1354 ls
= z
= scm_cons (scm_sym_begin
, SCM_UNSPECIFIED
);
1356 case SCM_BIT8(SCM_IM_CASE
):
1357 ls
= z
= scm_cons (scm_sym_case
, SCM_UNSPECIFIED
);
1359 case SCM_BIT8(SCM_IM_COND
):
1360 ls
= z
= scm_cons (scm_sym_cond
, SCM_UNSPECIFIED
);
1362 case SCM_BIT8 (SCM_IM_DO
):
1364 /* format: (#@do (nk nk-1 ...) (i1 ... ik) (test) (body) s1 ... sk),
1365 * where nx is the name of a local variable, ix is an initializer for
1366 * the local variable, test is the test clause of the do loop, body is
1367 * the body of the do loop and sx are the step clauses for the local
1369 SCM names
, inits
, test
, memoized_body
, steps
, bindings
;
1372 names
= SCM_CAR (x
);
1374 inits
= scm_reverse (unmemocopy (SCM_CAR (x
), env
));
1375 env
= EXTEND_ENV (names
, SCM_EOL
, env
);
1377 test
= unmemocopy (SCM_CAR (x
), env
);
1379 memoized_body
= SCM_CAR (x
);
1381 steps
= scm_reverse (unmemocopy (x
, env
));
1383 /* build transformed binding list */
1385 while (!SCM_NULLP (names
))
1387 SCM name
= SCM_CAR (names
);
1388 SCM init
= SCM_CAR (inits
);
1389 SCM step
= SCM_CAR (steps
);
1390 step
= SCM_EQ_P (step
, name
) ? SCM_EOL
: scm_list_1 (step
);
1392 bindings
= scm_cons (scm_cons2 (name
, init
, step
), bindings
);
1394 names
= SCM_CDR (names
);
1395 inits
= SCM_CDR (inits
);
1396 steps
= SCM_CDR (steps
);
1398 z
= scm_cons (test
, SCM_UNSPECIFIED
);
1399 ls
= scm_cons2 (scm_sym_do
, bindings
, z
);
1401 x
= scm_cons (SCM_BOOL_F
, memoized_body
);
1404 case SCM_BIT8(SCM_IM_IF
):
1405 ls
= z
= scm_cons (scm_sym_if
, SCM_UNSPECIFIED
);
1407 case SCM_BIT8 (SCM_IM_LET
):
1409 /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...),
1410 * where nx is the name of a local variable, ix is an initializer for
1411 * the local variable and by are the body clauses. */
1412 SCM names
, inits
, bindings
;
1415 names
= SCM_CAR (x
);
1417 inits
= scm_reverse (unmemocopy (SCM_CAR (x
), env
));
1418 env
= EXTEND_ENV (names
, SCM_EOL
, env
);
1420 bindings
= build_binding_list (names
, inits
);
1421 z
= scm_cons (bindings
, SCM_UNSPECIFIED
);
1422 ls
= scm_cons (scm_sym_let
, z
);
1425 case SCM_BIT8 (SCM_IM_LETREC
):
1427 /* format: (#@letrec (nk nk-1 ...) (i1 ... ik) b1 ...),
1428 * where nx is the name of a local variable, ix is an initializer for
1429 * the local variable and by are the body clauses. */
1430 SCM names
, inits
, bindings
;
1433 names
= SCM_CAR (x
);
1434 env
= EXTEND_ENV (names
, SCM_EOL
, env
);
1436 inits
= scm_reverse (unmemocopy (SCM_CAR (x
), env
));
1438 bindings
= build_binding_list (names
, inits
);
1439 z
= scm_cons (bindings
, SCM_UNSPECIFIED
);
1440 ls
= scm_cons (scm_sym_letrec
, z
);
1443 case SCM_BIT8(SCM_IM_LETSTAR
):
1451 env
= EXTEND_ENV (SCM_EOL
, SCM_EOL
, env
);
1454 y
= z
= scm_acons (SCM_CAR (b
),
1456 scm_cons (unmemocopy (SCM_CADR (b
), env
), SCM_EOL
), env
),
1458 env
= EXTEND_ENV (SCM_CAR (b
), SCM_BOOL_F
, env
);
1462 SCM_SETCDR (y
, SCM_EOL
);
1463 ls
= scm_cons (scm_sym_let
, z
= scm_cons (y
, SCM_UNSPECIFIED
));
1468 SCM_SETCDR (z
, scm_acons (SCM_CAR (b
),
1470 scm_list_1 (unmemocopy (SCM_CADR (b
), env
)), env
),
1473 env
= EXTEND_ENV (SCM_CAR (b
), SCM_BOOL_F
, env
);
1476 while (SCM_NIMP (b
));
1477 SCM_SETCDR (z
, SCM_EOL
);
1479 ls
= scm_cons (scm_sym_letstar
, z
= scm_cons (y
, SCM_UNSPECIFIED
));
1482 case SCM_BIT8(SCM_IM_OR
):
1483 ls
= z
= scm_cons (scm_sym_or
, SCM_UNSPECIFIED
);
1485 case SCM_BIT8(SCM_IM_LAMBDA
):
1487 z
= scm_cons (SCM_CAR (x
), SCM_UNSPECIFIED
);
1488 ls
= scm_cons (scm_sym_lambda
, z
);
1489 env
= EXTEND_ENV (SCM_CAR (x
), SCM_EOL
, env
);
1491 case SCM_BIT8(SCM_IM_QUOTE
):
1492 ls
= z
= scm_cons (scm_sym_quote
, SCM_UNSPECIFIED
);
1494 case SCM_BIT8(SCM_IM_SET_X
):
1495 ls
= z
= scm_cons (scm_sym_set_x
, SCM_UNSPECIFIED
);
1497 case SCM_BIT8(SCM_IM_DEFINE
):
1502 z
= scm_cons (n
, SCM_UNSPECIFIED
);
1503 ls
= scm_cons (scm_sym_define
, z
);
1504 if (!SCM_NULLP (env
))
1505 SCM_SETCAR (SCM_CAR (env
), scm_cons (n
, SCM_CAAR (env
)));
1508 case SCM_BIT8(SCM_MAKISYM (0)):
1512 switch (SCM_ISYMNUM (z
))
1514 case (SCM_ISYMNUM (SCM_IM_APPLY
)):
1515 ls
= z
= scm_cons (scm_sym_atapply
, SCM_UNSPECIFIED
);
1517 case (SCM_ISYMNUM (SCM_IM_CONT
)):
1518 ls
= z
= scm_cons (scm_sym_atcall_cc
, SCM_UNSPECIFIED
);
1520 case (SCM_ISYMNUM (SCM_IM_DELAY
)):
1521 ls
= z
= scm_cons (scm_sym_delay
, SCM_UNSPECIFIED
);
1524 case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES
)):
1525 ls
= z
= scm_cons (scm_sym_at_call_with_values
, SCM_UNSPECIFIED
);
1528 /* appease the Sun compiler god: */ ;
1532 ls
= z
= unmemocar (scm_cons (unmemocopy (SCM_CAR (x
), env
),
1538 while (SCM_CONSP (x
))
1540 SCM form
= SCM_CAR (x
);
1541 if (!SCM_ISYMP (form
))
1543 SCM copy
= scm_cons (unmemocopy (form
, env
), SCM_UNSPECIFIED
);
1544 SCM_SETCDR (z
, unmemocar (copy
, env
));
1550 #ifdef DEBUG_EXTENSIONS
1551 if (!SCM_FALSEP (p
))
1552 scm_whash_insert (scm_source_whash
, ls
, p
);
1559 scm_unmemocopy (SCM x
, SCM env
)
1561 if (!SCM_NULLP (env
))
1562 /* Make a copy of the lowest frame to protect it from
1563 modifications by SCM_IM_DEFINE */
1564 return unmemocopy (x
, scm_cons (SCM_CAR (env
), SCM_CDR (env
)));
1566 return unmemocopy (x
, env
);
1569 #ifndef SCM_RECKLESS
1572 scm_badargsp (SCM formals
, SCM args
)
1574 while (SCM_NIMP (formals
))
1576 if (!SCM_CONSP (formals
))
1580 formals
= SCM_CDR (formals
);
1581 args
= SCM_CDR (args
);
1583 return !SCM_NULLP (args
) ? 1 : 0;
1589 scm_badformalsp (SCM closure
, int n
)
1591 SCM formals
= SCM_CLOSURE_FORMALS (closure
);
1592 while (!SCM_NULLP (formals
))
1594 if (!SCM_CONSP (formals
))
1599 formals
= SCM_CDR (formals
);
1606 scm_eval_args (SCM l
, SCM env
, SCM proc
)
1608 SCM results
= SCM_EOL
, *lloc
= &results
, res
;
1609 while (SCM_CONSP (l
))
1611 res
= EVALCAR (l
, env
);
1613 *lloc
= scm_list_1 (res
);
1614 lloc
= SCM_CDRLOC (*lloc
);
1619 scm_wrong_num_args (proc
);
1625 scm_eval_body (SCM code
, SCM env
)
1629 next
= SCM_CDR (code
);
1630 while (!SCM_NULLP (next
))
1632 if (SCM_IMP (SCM_CAR (code
)))
1634 if (SCM_ISYMP (SCM_CAR (code
)))
1636 code
= scm_m_expand_body (code
, env
);
1641 SCM_XEVAL (SCM_CAR (code
), env
);
1643 next
= SCM_CDR (code
);
1645 return SCM_XEVALCAR (code
, env
);
1652 /* SECTION: This code is specific for the debugging support. One
1653 * branch is read when DEVAL isn't defined, the other when DEVAL is
1659 #define SCM_APPLY scm_apply
1660 #define PREP_APPLY(proc, args)
1662 #define RETURN(x) do { return x; } while (0)
1663 #ifdef STACK_CHECKING
1664 #ifndef NO_CEVAL_STACK_CHECKING
1665 #define EVAL_STACK_CHECKING
1672 #define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */
1674 #define SCM_APPLY scm_dapply
1676 #define PREP_APPLY(p, l) \
1677 { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; }
1679 #define ENTER_APPLY \
1681 SCM_SET_ARGSREADY (debug);\
1682 if (CHECK_APPLY && SCM_TRAPS_P)\
1683 if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\
1685 SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \
1686 SCM_SET_TRACED_FRAME (debug); \
1688 if (SCM_CHEAPTRAPS_P)\
1690 tmp = scm_make_debugobj (&debug);\
1691 scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\
1696 tmp = scm_make_continuation (&first);\
1698 scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\
1704 #define RETURN(e) do { proc = (e); goto exit; } while (0)
1705 #ifdef STACK_CHECKING
1706 #ifndef EVAL_STACK_CHECKING
1707 #define EVAL_STACK_CHECKING
1711 /* scm_ceval_ptr points to the currently selected evaluator.
1712 * *fixme*: Although efficiency is important here, this state variable
1713 * should probably not be a global. It should be related to the
1718 SCM (*scm_ceval_ptr
) (SCM x
, SCM env
);
1720 /* scm_last_debug_frame contains a pointer to the last debugging
1721 * information stack frame. It is accessed very often from the
1722 * debugging evaluator, so it should probably not be indirectly
1723 * addressed. Better to save and restore it from the current root at
1728 scm_t_debug_frame
*scm_last_debug_frame
;
1731 /* scm_debug_eframe_size is the number of slots available for pseudo
1732 * stack frames at each real stack frame.
1735 long scm_debug_eframe_size
;
1737 int scm_debug_mode
, scm_check_entry_p
, scm_check_apply_p
, scm_check_exit_p
;
1739 long scm_eval_stack
;
1741 scm_t_option scm_eval_opts
[] = {
1742 { SCM_OPTION_INTEGER
, "stack", 22000, "Size of thread stacks (in machine words)." }
1745 scm_t_option scm_debug_opts
[] = {
1746 { SCM_OPTION_BOOLEAN
, "cheap", 1,
1747 "*Flyweight representation of the stack at traps." },
1748 { SCM_OPTION_BOOLEAN
, "breakpoints", 0, "*Check for breakpoints." },
1749 { SCM_OPTION_BOOLEAN
, "trace", 0, "*Trace mode." },
1750 { SCM_OPTION_BOOLEAN
, "procnames", 1,
1751 "Record procedure names at definition." },
1752 { SCM_OPTION_BOOLEAN
, "backwards", 0,
1753 "Display backtrace in anti-chronological order." },
1754 { SCM_OPTION_INTEGER
, "width", 79, "Maximal width of backtrace." },
1755 { SCM_OPTION_INTEGER
, "indent", 10, "Maximal indentation in backtrace." },
1756 { SCM_OPTION_INTEGER
, "frames", 3,
1757 "Maximum number of tail-recursive frames in backtrace." },
1758 { SCM_OPTION_INTEGER
, "maxdepth", 1000,
1759 "Maximal number of stored backtrace frames." },
1760 { SCM_OPTION_INTEGER
, "depth", 20, "Maximal length of printed backtrace." },
1761 { SCM_OPTION_BOOLEAN
, "backtrace", 0, "Show backtrace on error." },
1762 { SCM_OPTION_BOOLEAN
, "debug", 0, "Use the debugging evaluator." },
1763 { SCM_OPTION_INTEGER
, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." },
1764 { SCM_OPTION_SCM
, "show-file-name", (unsigned long)SCM_BOOL_T
, "Show file names and line numbers in backtraces when not `#f'. A value of `base' displays only base names, while `#t' displays full names."}
1767 scm_t_option scm_evaluator_trap_table
[] = {
1768 { SCM_OPTION_BOOLEAN
, "traps", 0, "Enable evaluator traps." },
1769 { SCM_OPTION_BOOLEAN
, "enter-frame", 0, "Trap when eval enters new frame." },
1770 { SCM_OPTION_BOOLEAN
, "apply-frame", 0, "Trap when entering apply." },
1771 { SCM_OPTION_BOOLEAN
, "exit-frame", 0, "Trap when exiting eval or apply." },
1772 { SCM_OPTION_SCM
, "enter-frame-handler", (unsigned long)SCM_BOOL_F
, "Handler for enter-frame traps." },
1773 { SCM_OPTION_SCM
, "apply-frame-handler", (unsigned long)SCM_BOOL_F
, "Handler for apply-frame traps." },
1774 { SCM_OPTION_SCM
, "exit-frame-handler", (unsigned long)SCM_BOOL_F
, "Handler for exit-frame traps." }
1777 SCM_DEFINE (scm_eval_options_interface
, "eval-options-interface", 0, 1, 0,
1779 "Option interface for the evaluation options. Instead of using\n"
1780 "this procedure directly, use the procedures @code{eval-enable},\n"
1781 "@code{eval-disable}, @code{eval-set!} and @var{eval-options}.")
1782 #define FUNC_NAME s_scm_eval_options_interface
1786 ans
= scm_options (setting
,
1790 scm_eval_stack
= SCM_EVAL_STACK
* sizeof (void *);
1796 SCM_DEFINE (scm_evaluator_traps
, "evaluator-traps-interface", 0, 1, 0,
1798 "Option interface for the evaluator trap options.")
1799 #define FUNC_NAME s_scm_evaluator_traps
1803 ans
= scm_options (setting
,
1804 scm_evaluator_trap_table
,
1805 SCM_N_EVALUATOR_TRAPS
,
1807 SCM_RESET_DEBUG_MODE
;
1814 deval_args (SCM l
, SCM env
, SCM proc
, SCM
*lloc
)
1816 SCM
*results
= lloc
, res
;
1817 while (SCM_CONSP (l
))
1819 res
= EVALCAR (l
, env
);
1821 *lloc
= scm_list_1 (res
);
1822 lloc
= SCM_CDRLOC (*lloc
);
1827 scm_wrong_num_args (proc
);
1835 /* SECTION: This code is compiled twice.
1839 /* Update the toplevel environment frame ENV so that it refers to the
1840 * current module. */
1841 #define UPDATE_TOPLEVEL_ENV(env) \
1843 SCM p = scm_current_module_lookup_closure (); \
1844 if (p != SCM_CAR(env)) \
1845 env = scm_top_level_env (p); \
1849 #define CHECK_EQVISH(A,B) (SCM_EQ_P ((A), (B)) || (!SCM_FALSEP (scm_eqv_p ((A), (B)))))
1852 /* This is the evaluator. Like any real monster, it has three heads:
1854 * scm_ceval is the non-debugging evaluator, scm_deval is the debugging
1855 * version. Both are implemented using a common code base, using the
1856 * following mechanism: SCM_CEVAL is a macro, which is either defined to
1857 * scm_ceval or scm_deval. Thus, there is no function SCM_CEVAL, but the code
1858 * for SCM_CEVAL actually compiles to either scm_ceval or scm_deval. When
1859 * SCM_CEVAL is defined to scm_ceval, it is known that the macro DEVAL is not
1860 * defined. When SCM_CEVAL is defined to scm_deval, then the macro DEVAL is
1861 * known to be defined. Thus, in SCM_CEVAL parts for the debugging evaluator
1862 * are enclosed within #ifdef DEVAL ... #endif.
1864 * All three (scm_ceval, scm_deval and their common implementation SCM_CEVAL)
1865 * take two input parameters, x and env: x is a single expression to be
1866 * evalutated. env is the environment in which bindings are searched.
1868 * x is known to be a cell (i. e. a pair or any other non-immediate). Since x
1869 * is a single expression, it is necessarily in a tail position. If x is just
1870 * a call to another function like in the expression (foo exp1 exp2 ...), the
1871 * realization of that call therefore _must_not_ increase stack usage (the
1872 * evaluation of exp1, exp2 etc., however, may do so). This is realized by
1873 * making extensive use of 'goto' statements within the evaluator: The gotos
1874 * replace recursive calls to SCM_CEVAL, thus re-using the same stack frame
1875 * that SCM_CEVAL was already using. If, however, x represents some form that
1876 * requires to evaluate a sequence of expressions like (begin exp1 exp2 ...),
1877 * then recursive calls to SCM_CEVAL are performed for all but the last
1878 * expression of that sequence. */
1882 scm_ceval (SCM x
, SCM env
)
1888 scm_deval (SCM x
, SCM env
)
1893 SCM_CEVAL (SCM x
, SCM env
)
1900 SCM proc
, arg2
, orig_sym
;
1902 scm_t_debug_frame debug
;
1903 scm_t_debug_info
*debug_info_end
;
1904 debug
.prev
= scm_last_debug_frame
;
1905 debug
.status
= scm_debug_eframe_size
;
1907 * The debug.vect contains twice as much scm_t_debug_info frames as the
1908 * user has specified with (debug-set! frames <n>).
1910 * Even frames are eval frames, odd frames are apply frames.
1912 debug
.vect
= (scm_t_debug_info
*) alloca (scm_debug_eframe_size
1913 * sizeof (scm_t_debug_info
));
1914 debug
.info
= debug
.vect
;
1915 debug_info_end
= debug
.vect
+ scm_debug_eframe_size
;
1916 scm_last_debug_frame
= &debug
;
1918 #ifdef EVAL_STACK_CHECKING
1919 if (scm_stack_checking_enabled_p
1920 && SCM_STACK_OVERFLOW_P ((SCM_STACKITEM
*) &proc
))
1923 debug
.info
->e
.exp
= x
;
1924 debug
.info
->e
.env
= env
;
1926 scm_report_stack_overflow ();
1933 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
1936 SCM_CLEAR_ARGSREADY (debug
);
1937 if (SCM_OVERFLOWP (debug
))
1940 * In theory, this should be the only place where it is necessary to
1941 * check for space in debug.vect since both eval frames and
1942 * available space are even.
1944 * For this to be the case, however, it is necessary that primitive
1945 * special forms which jump back to `loop', `begin' or some similar
1946 * label call PREP_APPLY. A convenient way to do this is to jump to
1947 * `loopnoap' or `cdrxnoap'.
1949 else if (++debug
.info
>= debug_info_end
)
1951 SCM_SET_OVERFLOW (debug
);
1955 debug
.info
->e
.exp
= x
;
1956 debug
.info
->e
.env
= env
;
1957 if (CHECK_ENTRY
&& SCM_TRAPS_P
)
1958 if (SCM_ENTER_FRAME_P
|| (SCM_BREAKPOINTS_P
&& SRCBRKP (x
)))
1960 SCM tail
= SCM_BOOL(SCM_TAILRECP (debug
));
1961 SCM_SET_TAILREC (debug
);
1962 if (SCM_CHEAPTRAPS_P
)
1963 t
.arg1
= scm_make_debugobj (&debug
);
1967 SCM val
= scm_make_continuation (&first
);
1977 /* This gives the possibility for the debugger to
1978 modify the source expression before evaluation. */
1983 scm_call_4 (SCM_ENTER_FRAME_HDLR
,
1984 scm_sym_enter_frame
,
1987 scm_unmemocopy (x
, env
));
1991 #if defined (USE_THREADS) || defined (DEVAL)
1995 switch (SCM_TYP7 (x
))
1997 case scm_tc7_symbol
:
1998 /* Only happens when called at top level. */
1999 x
= scm_cons (x
, SCM_UNDEFINED
);
2000 RETURN (*scm_lookupcar (x
, env
, 1));
2002 case SCM_BIT8(SCM_IM_AND
):
2004 while (!SCM_NULLP (SCM_CDR (x
)))
2006 if (SCM_FALSEP (t
.arg1
= EVALCAR (x
, env
)) || SCM_NILP (t
.arg1
))
2007 RETURN (SCM_BOOL_F
);
2011 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2014 case SCM_BIT8(SCM_IM_BEGIN
):
2015 if (SCM_NULLP (SCM_CDR (x
)))
2016 RETURN (SCM_UNSPECIFIED
);
2018 /* (currently unused)
2020 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2021 /* (currently unused)
2026 /* If we are on toplevel with a lookup closure, we need to sync
2027 with the current module. */
2028 if (SCM_CONSP (env
) && !SCM_CONSP (SCM_CAR (env
)))
2030 UPDATE_TOPLEVEL_ENV (env
);
2031 while (!SCM_NULLP (SCM_CDR (x
)))
2034 UPDATE_TOPLEVEL_ENV (env
);
2040 goto nontoplevel_begin
;
2042 nontoplevel_cdrxnoap
:
2043 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2044 nontoplevel_cdrxbegin
:
2047 while (!SCM_NULLP (SCM_CDR (x
)))
2049 if (SCM_IMP (SCM_CAR (x
)))
2051 if (SCM_ISYMP (SCM_CAR (x
)))
2053 x
= scm_m_expand_body (x
, env
);
2054 goto nontoplevel_begin
;
2057 SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (x
));
2060 SCM_CEVAL (SCM_CAR (x
), env
);
2064 carloop
: /* scm_eval car of last form in list */
2065 if (SCM_IMP (SCM_CAR (x
)))
2068 RETURN (SCM_EVALIM (x
, env
));
2071 if (SCM_SYMBOLP (SCM_CAR (x
)))
2072 RETURN (*scm_lookupcar (x
, env
, 1));
2075 goto loop
; /* tail recurse */
2078 case SCM_BIT8(SCM_IM_CASE
):
2080 t
.arg1
= EVALCAR (x
, env
);
2081 while (SCM_NIMP (x
= SCM_CDR (x
)))
2084 if (SCM_EQ_P (scm_sym_else
, SCM_CAR (proc
)))
2087 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2090 proc
= SCM_CAR (proc
);
2091 while (SCM_NIMP (proc
))
2093 if (CHECK_EQVISH (SCM_CAR (proc
), t
.arg1
))
2096 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2099 proc
= SCM_CDR (proc
);
2102 RETURN (SCM_UNSPECIFIED
);
2105 case SCM_BIT8 (SCM_IM_COND
):
2107 while (!SCM_NULLP (x
))
2110 if (SCM_EQ_P (SCM_CAR (proc
), scm_sym_else
))
2113 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2116 t
.arg1
= EVALCAR (proc
, env
);
2117 if (!SCM_FALSEP (t
.arg1
) && !SCM_NILP (t
.arg1
))
2122 if (!SCM_EQ_P (scm_sym_arrow
, SCM_CAR (x
)))
2124 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2128 proc
= EVALCAR (proc
, env
);
2129 SCM_ASRTGO (SCM_NIMP (proc
), badfun
);
2130 PREP_APPLY (proc
, scm_list_1 (t
.arg1
));
2132 if (SCM_CLOSUREP(proc
) && scm_badformalsp (proc
, 1))
2133 goto umwrongnumargs
;
2138 RETURN (SCM_UNSPECIFIED
);
2141 case SCM_BIT8(SCM_IM_DO
):
2143 proc
= SCM_CADR (x
); /* inits */
2144 t
.arg1
= SCM_EOL
; /* values */
2145 while (SCM_NIMP (proc
))
2147 t
.arg1
= scm_cons (EVALCAR (proc
, env
), t
.arg1
);
2148 proc
= SCM_CDR (proc
);
2150 env
= EXTEND_ENV (SCM_CAR (x
), t
.arg1
, env
);
2152 while (proc
= SCM_CAR (x
),
2153 SCM_FALSEP (t
.arg1
= EVALCAR (proc
, env
)) || SCM_NILP (t
.arg1
))
2155 for (proc
= SCM_CADR (x
); SCM_NIMP (proc
); proc
= SCM_CDR (proc
))
2157 t
.arg1
= SCM_CAR (proc
); /* body */
2158 SIDEVAL (t
.arg1
, env
);
2160 for (t
.arg1
= SCM_EOL
, proc
= SCM_CDDR (x
);
2162 proc
= SCM_CDR (proc
))
2163 t
.arg1
= scm_cons (EVALCAR (proc
, env
), t
.arg1
); /* steps */
2164 env
= EXTEND_ENV (SCM_CAAR (env
), t
.arg1
, SCM_CDR (env
));
2168 RETURN (SCM_UNSPECIFIED
);
2169 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2170 goto nontoplevel_begin
;
2173 case SCM_BIT8(SCM_IM_IF
):
2175 if (!SCM_FALSEP (t
.arg1
= EVALCAR (x
, env
)) && !SCM_NILP (t
.arg1
))
2177 else if (SCM_IMP (x
= SCM_CDDR (x
)))
2178 RETURN (SCM_UNSPECIFIED
);
2179 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2183 case SCM_BIT8(SCM_IM_LET
):
2185 proc
= SCM_CADR (x
);
2189 t
.arg1
= scm_cons (EVALCAR (proc
, env
), t
.arg1
);
2191 while (SCM_NIMP (proc
= SCM_CDR (proc
)));
2192 env
= EXTEND_ENV (SCM_CAR (x
), t
.arg1
, env
);
2194 goto nontoplevel_cdrxnoap
;
2197 case SCM_BIT8(SCM_IM_LETREC
):
2199 env
= EXTEND_ENV (SCM_CAR (x
), scm_undefineds
, env
);
2205 t
.arg1
= scm_cons (EVALCAR (proc
, env
), t
.arg1
);
2207 while (SCM_NIMP (proc
= SCM_CDR (proc
)));
2208 SCM_SETCDR (SCM_CAR (env
), t
.arg1
);
2209 goto nontoplevel_cdrxnoap
;
2212 case SCM_BIT8(SCM_IM_LETSTAR
):
2215 SCM bindings
= SCM_CAR (x
);
2216 if (SCM_NULLP (bindings
))
2217 env
= EXTEND_ENV (SCM_EOL
, SCM_EOL
, env
);
2222 SCM name
= SCM_CAR (bindings
);
2223 SCM init
= SCM_CDR (bindings
);
2224 env
= EXTEND_ENV (name
, EVALCAR (init
, env
), env
);
2225 bindings
= SCM_CDR (init
);
2227 while (!SCM_NULLP (bindings
));
2230 goto nontoplevel_cdrxnoap
;
2233 case SCM_BIT8(SCM_IM_OR
):
2235 while (!SCM_NULLP (SCM_CDR (x
)))
2237 SCM val
= EVALCAR (x
, env
);
2238 if (!SCM_FALSEP (val
) && !SCM_NILP (val
))
2243 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2247 case SCM_BIT8(SCM_IM_LAMBDA
):
2248 RETURN (scm_closure (SCM_CDR (x
), env
));
2251 case SCM_BIT8(SCM_IM_QUOTE
):
2252 RETURN (SCM_CADR (x
));
2255 case SCM_BIT8(SCM_IM_SET_X
):
2258 switch (SCM_ITAG3 (proc
))
2261 if (SCM_VARIABLEP (proc
))
2262 t
.lloc
= SCM_VARIABLE_LOC (proc
);
2264 t
.lloc
= scm_lookupcar (x
, env
, 1);
2266 #ifdef MEMOIZE_LOCALS
2268 t
.lloc
= scm_ilookup (proc
, env
);
2273 *t
.lloc
= EVALCAR (x
, env
);
2277 RETURN (SCM_UNSPECIFIED
);
2281 case SCM_BIT8(SCM_IM_DEFINE
): /* only for internal defines */
2282 scm_misc_error (NULL
, "Bad define placement", SCM_EOL
);
2284 /* new syntactic forms go here. */
2285 case SCM_BIT8(SCM_MAKISYM (0)):
2287 SCM_ASRTGO (SCM_ISYMP (proc
), badfun
);
2288 switch (SCM_ISYMNUM (proc
))
2290 case (SCM_ISYMNUM (SCM_IM_APPLY
)):
2292 proc
= EVALCAR (proc
, env
);
2293 SCM_ASRTGO (SCM_NIMP (proc
), badfun
);
2294 if (SCM_CLOSUREP (proc
))
2297 PREP_APPLY (proc
, SCM_EOL
);
2298 t
.arg1
= SCM_CDDR (x
);
2299 t
.arg1
= EVALCAR (t
.arg1
, env
);
2301 /* Go here to tail-call a closure. PROC is the closure
2302 and T.ARG1 is the list of arguments. Do not forget to
2305 debug
.info
->a
.args
= t
.arg1
;
2307 #ifndef SCM_RECKLESS
2308 if (scm_badargsp (SCM_CLOSURE_FORMALS (proc
), t
.arg1
))
2312 /* Copy argument list */
2313 if (SCM_IMP (t
.arg1
))
2317 argl
= tl
= scm_cons (SCM_CAR (t
.arg1
), SCM_UNSPECIFIED
);
2318 while (SCM_NIMP (t
.arg1
= SCM_CDR (t
.arg1
))
2319 && SCM_CONSP (t
.arg1
))
2321 SCM_SETCDR (tl
, scm_cons (SCM_CAR (t
.arg1
),
2325 SCM_SETCDR (tl
, t
.arg1
);
2328 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
), argl
, SCM_ENV (proc
));
2329 x
= SCM_CLOSURE_BODY (proc
);
2330 goto nontoplevel_begin
;
2335 case (SCM_ISYMNUM (SCM_IM_CONT
)):
2338 SCM val
= scm_make_continuation (&first
);
2346 proc
= scm_eval_car (proc
, env
);
2347 SCM_ASRTGO (SCM_NIMP (proc
), badfun
);
2348 PREP_APPLY (proc
, scm_list_1 (t
.arg1
));
2350 if (SCM_CLOSUREP(proc
) && scm_badformalsp (proc
, 1))
2351 goto umwrongnumargs
;
2354 case (SCM_ISYMNUM (SCM_IM_DELAY
)):
2355 RETURN (scm_makprom (scm_closure (SCM_CDR (x
), env
)));
2357 case (SCM_ISYMNUM (SCM_IM_DISPATCH
)):
2358 proc
= SCM_CADR (x
); /* unevaluated operands */
2359 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2361 arg2
= *scm_ilookup (proc
, env
);
2362 else if (!SCM_CONSP (proc
))
2364 if (SCM_VARIABLEP (proc
))
2365 arg2
= SCM_VARIABLE_REF (proc
);
2367 arg2
= *scm_lookupcar (SCM_CDR (x
), env
, 1);
2371 arg2
= scm_list_1 (EVALCAR (proc
, env
));
2372 t
.lloc
= SCM_CDRLOC (arg2
);
2373 while (SCM_NIMP (proc
= SCM_CDR (proc
)))
2375 *t
.lloc
= scm_list_1 (EVALCAR (proc
, env
));
2376 t
.lloc
= SCM_CDRLOC (*t
.lloc
);
2381 /* The type dispatch code is duplicated here
2382 * (c.f. objects.c:scm_mcache_compute_cmethod) since that
2383 * cuts down execution time for type dispatch to 50%.
2386 long i
, n
, end
, mask
;
2387 SCM z
= SCM_CDDR (x
);
2388 n
= SCM_INUM (SCM_CAR (z
)); /* maximum number of specializers */
2389 proc
= SCM_CADR (z
);
2391 if (SCM_NIMP (proc
))
2393 /* Prepare for linear search */
2396 end
= SCM_VECTOR_LENGTH (proc
);
2400 /* Compute a hash value */
2401 long hashset
= SCM_INUM (proc
);
2404 mask
= SCM_INUM (SCM_CAR (z
));
2405 proc
= SCM_CADR (z
);
2408 if (SCM_NIMP (t
.arg1
))
2411 i
+= SCM_STRUCT_DATA (scm_class_of (SCM_CAR (t
.arg1
)))
2412 [scm_si_hashsets
+ hashset
];
2413 t
.arg1
= SCM_CDR (t
.arg1
);
2415 while (j
-- && SCM_NIMP (t
.arg1
));
2420 /* Search for match */
2424 z
= SCM_VELTS (proc
)[i
];
2425 t
.arg1
= arg2
; /* list of arguments */
2426 if (SCM_NIMP (t
.arg1
))
2429 /* More arguments than specifiers => CLASS != ENV */
2430 if (! SCM_EQ_P (scm_class_of (SCM_CAR (t
.arg1
)), SCM_CAR (z
)))
2432 t
.arg1
= SCM_CDR (t
.arg1
);
2435 while (j
-- && SCM_NIMP (t
.arg1
));
2436 /* Fewer arguments than specifiers => CAR != ENV */
2437 if (!(SCM_IMP (SCM_CAR (z
)) || SCM_CONSP (SCM_CAR (z
))))
2440 env
= EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (z
)),
2442 SCM_CMETHOD_ENV (z
));
2443 x
= SCM_CMETHOD_CODE (z
);
2444 goto nontoplevel_cdrxbegin
;
2449 z
= scm_memoize_method (x
, arg2
);
2453 case (SCM_ISYMNUM (SCM_IM_SLOT_REF
)):
2455 t
.arg1
= EVALCAR (x
, env
);
2456 RETURN (SCM_PACK (SCM_STRUCT_DATA (t
.arg1
) [SCM_INUM (SCM_CADR (x
))]));
2458 case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X
)):
2460 t
.arg1
= EVALCAR (x
, env
);
2463 SCM_STRUCT_DATA (t
.arg1
) [SCM_INUM (SCM_CAR (x
))]
2464 = SCM_UNPACK (EVALCAR (proc
, env
));
2465 RETURN (SCM_UNSPECIFIED
);
2467 #ifdef SCM_ENABLE_ELISP
2469 case (SCM_ISYMNUM (SCM_IM_NIL_COND
)):
2471 while (SCM_NIMP (x
= SCM_CDR (proc
)))
2473 if (!(SCM_FALSEP (t
.arg1
= EVALCAR (proc
, env
))
2474 || SCM_NILP (t
.arg1
)
2475 || SCM_NULLP (t
.arg1
)))
2477 if (SCM_EQ_P (SCM_CAR (x
), SCM_UNSPECIFIED
))
2479 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2485 PREP_APPLY (SCM_UNDEFINED
, SCM_EOL
);
2488 #endif /* SCM_ENABLE_ELISP */
2490 case (SCM_ISYMNUM (SCM_IM_BIND
)):
2492 SCM vars
, exps
, vals
;
2495 vars
= SCM_CAAR (x
);
2496 exps
= SCM_CDAR (x
);
2500 while (SCM_NIMP (exps
))
2502 vals
= scm_cons (EVALCAR (exps
, env
), vals
);
2503 exps
= SCM_CDR (exps
);
2506 scm_swap_bindings (vars
, vals
);
2507 scm_dynwinds
= scm_acons (vars
, vals
, scm_dynwinds
);
2509 arg2
= x
= SCM_CDR (x
);
2510 while (!SCM_NULLP (arg2
= SCM_CDR (arg2
)))
2512 SIDEVAL (SCM_CAR (x
), env
);
2515 proc
= EVALCAR (x
, env
);
2517 scm_dynwinds
= SCM_CDR (scm_dynwinds
);
2518 scm_swap_bindings (vars
, vals
);
2523 case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES
)):
2526 x
= EVALCAR (proc
, env
);
2527 proc
= SCM_CDR (proc
);
2528 proc
= EVALCAR (proc
, env
);
2529 t
.arg1
= SCM_APPLY (x
, SCM_EOL
, SCM_EOL
);
2530 if (SCM_VALUESP (t
.arg1
))
2531 t
.arg1
= scm_struct_ref (t
.arg1
, SCM_INUM0
);
2533 t
.arg1
= scm_list_1 (t
.arg1
);
2534 if (SCM_CLOSUREP (proc
))
2536 PREP_APPLY (proc
, t
.arg1
);
2539 return SCM_APPLY (proc
, t
.arg1
, SCM_EOL
);
2549 scm_misc_error (NULL
, "Wrong type to apply: ~S", scm_list_1 (proc
));
2550 case scm_tc7_vector
:
2554 case scm_tc7_byvect
:
2561 #ifdef HAVE_LONG_LONGS
2562 case scm_tc7_llvect
:
2565 case scm_tc7_string
:
2567 case scm_tcs_closures
:
2571 case scm_tcs_struct
:
2574 case scm_tc7_variable
:
2575 RETURN (SCM_VARIABLE_REF(x
));
2577 #ifdef MEMOIZE_LOCALS
2578 case SCM_BIT8(SCM_ILOC00
):
2579 proc
= *scm_ilookup (SCM_CAR (x
), env
);
2580 SCM_ASRTGO (SCM_NIMP (proc
), badfun
);
2581 #ifndef SCM_RECKLESS
2587 #endif /* ifdef MEMOIZE_LOCALS */
2589 case scm_tcs_cons_nimcar
:
2590 orig_sym
= SCM_CAR (x
);
2591 if (SCM_SYMBOLP (orig_sym
))
2594 t
.lloc
= scm_lookupcar1 (x
, env
, 1);
2597 /* we have lost the race, start again. */
2602 proc
= *scm_lookupcar (x
, env
, 1);
2607 SCM_SETCAR (x
, orig_sym
); /* Undo memoizing effect of
2611 if (SCM_MACROP (proc
))
2613 SCM_SETCAR (x
, orig_sym
); /* Undo memoizing effect of
2617 /* Set a flag during macro expansion so that macro
2618 application frames can be deleted from the backtrace. */
2619 SCM_SET_MACROEXP (debug
);
2621 t
.arg1
= SCM_APPLY (SCM_MACRO_CODE (proc
), x
,
2622 scm_cons (env
, scm_listofnull
));
2625 SCM_CLEAR_MACROEXP (debug
);
2627 switch (SCM_MACRO_TYPE (proc
))
2630 if (scm_ilength (t
.arg1
) <= 0)
2631 t
.arg1
= scm_list_2 (SCM_IM_BEGIN
, t
.arg1
);
2633 if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc
)))
2636 SCM_SETCAR (x
, SCM_CAR (t
.arg1
));
2637 SCM_SETCDR (x
, SCM_CDR (t
.arg1
));
2641 /* Prevent memoizing of debug info expression. */
2642 debug
.info
->e
.exp
= scm_cons_source (debug
.info
->e
.exp
,
2647 SCM_SETCAR (x
, SCM_CAR (t
.arg1
));
2648 SCM_SETCDR (x
, SCM_CDR (t
.arg1
));
2652 if (SCM_NIMP (x
= t
.arg1
))
2660 proc
= SCM_CEVAL (SCM_CAR (x
), env
);
2661 SCM_ASRTGO (!SCM_IMP (proc
), badfun
);
2662 #ifndef SCM_RECKLESS
2666 if (SCM_CLOSUREP (proc
))
2668 arg2
= SCM_CLOSURE_FORMALS (proc
);
2669 t
.arg1
= SCM_CDR (x
);
2670 while (!SCM_NULLP (arg2
))
2672 if (!SCM_CONSP (arg2
))
2674 if (SCM_IMP (t
.arg1
))
2675 goto umwrongnumargs
;
2676 arg2
= SCM_CDR (arg2
);
2677 t
.arg1
= SCM_CDR (t
.arg1
);
2679 if (!SCM_NULLP (t
.arg1
))
2680 goto umwrongnumargs
;
2682 else if (SCM_MACROP (proc
))
2683 goto handle_a_macro
;
2689 PREP_APPLY (proc
, SCM_EOL
);
2690 if (SCM_NULLP (SCM_CDR (x
))) {
2693 switch (SCM_TYP7 (proc
))
2694 { /* no arguments given */
2695 case scm_tc7_subr_0
:
2696 RETURN (SCM_SUBRF (proc
) ());
2697 case scm_tc7_subr_1o
:
2698 RETURN (SCM_SUBRF (proc
) (SCM_UNDEFINED
));
2700 RETURN (SCM_SUBRF (proc
) (SCM_EOL
));
2701 case scm_tc7_rpsubr
:
2702 RETURN (SCM_BOOL_T
);
2704 RETURN (SCM_SUBRF (proc
) (SCM_UNDEFINED
, SCM_UNDEFINED
));
2706 if (!SCM_SMOB_APPLICABLE_P (proc
))
2708 RETURN (SCM_SMOB_APPLY_0 (proc
));
2711 proc
= SCM_CCLO_SUBR (proc
);
2713 debug
.info
->a
.proc
= proc
;
2714 debug
.info
->a
.args
= scm_list_1 (t
.arg1
);
2718 proc
= SCM_PROCEDURE (proc
);
2720 debug
.info
->a
.proc
= proc
;
2722 if (!SCM_CLOSUREP (proc
))
2724 if (scm_badformalsp (proc
, 0))
2725 goto umwrongnumargs
;
2726 case scm_tcs_closures
:
2727 x
= SCM_CLOSURE_BODY (proc
);
2728 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
), SCM_EOL
, SCM_ENV (proc
));
2729 goto nontoplevel_begin
;
2730 case scm_tcs_struct
:
2731 if (SCM_OBJ_CLASS_FLAGS (proc
) & SCM_CLASSF_PURE_GENERIC
)
2733 x
= SCM_ENTITY_PROCEDURE (proc
);
2737 else if (!SCM_I_OPERATORP (proc
))
2742 proc
= (SCM_I_ENTITYP (proc
)
2743 ? SCM_ENTITY_PROCEDURE (proc
)
2744 : SCM_OPERATOR_PROCEDURE (proc
));
2746 debug
.info
->a
.proc
= proc
;
2747 debug
.info
->a
.args
= scm_list_1 (t
.arg1
);
2749 if (SCM_NIMP (proc
))
2754 case scm_tc7_subr_1
:
2755 case scm_tc7_subr_2
:
2756 case scm_tc7_subr_2o
:
2758 case scm_tc7_subr_3
:
2759 case scm_tc7_lsubr_2
:
2763 scm_wrong_num_args (proc
);
2765 /* handle macros here */
2770 /* must handle macros by here */
2775 else if (SCM_CONSP (x
))
2777 if (SCM_IMP (SCM_CAR (x
)))
2778 t
.arg1
= SCM_EVALIM (SCM_CAR (x
), env
);
2780 t
.arg1
= EVALCELLCAR (x
, env
);
2785 t
.arg1
= EVALCAR (x
, env
);
2788 debug
.info
->a
.args
= scm_list_1 (t
.arg1
);
2795 switch (SCM_TYP7 (proc
))
2796 { /* have one argument in t.arg1 */
2797 case scm_tc7_subr_2o
:
2798 RETURN (SCM_SUBRF (proc
) (t
.arg1
, SCM_UNDEFINED
));
2799 case scm_tc7_subr_1
:
2800 case scm_tc7_subr_1o
:
2801 RETURN (SCM_SUBRF (proc
) (t
.arg1
));
2803 if (SCM_SUBRF (proc
))
2805 if (SCM_INUMP (t
.arg1
))
2807 RETURN (scm_make_real (SCM_DSUBRF (proc
) ((double) SCM_INUM (t
.arg1
))));
2809 else if (SCM_REALP (t
.arg1
))
2811 RETURN (scm_make_real (SCM_DSUBRF (proc
) (SCM_REAL_VALUE (t
.arg1
))));
2814 else if (SCM_BIGP (t
.arg1
))
2816 RETURN (scm_make_real (SCM_DSUBRF (proc
) (scm_i_big2dbl (t
.arg1
))));
2819 SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc
), t
.arg1
,
2820 SCM_ARG1
, SCM_SYMBOL_CHARS (SCM_SNAME (proc
)));
2822 proc
= SCM_SNAME (proc
);
2824 char *chrs
= SCM_SYMBOL_CHARS (proc
) + SCM_SYMBOL_LENGTH (proc
) - 1;
2825 while ('c' != *--chrs
)
2827 SCM_ASSERT (SCM_CONSP (t
.arg1
),
2828 t
.arg1
, SCM_ARG1
, SCM_SYMBOL_CHARS (proc
));
2829 t
.arg1
= ('a' == *chrs
) ? SCM_CAR (t
.arg1
) : SCM_CDR (t
.arg1
);
2833 case scm_tc7_rpsubr
:
2834 RETURN (SCM_BOOL_T
);
2836 RETURN (SCM_SUBRF (proc
) (t
.arg1
, SCM_UNDEFINED
));
2839 RETURN (SCM_SUBRF (proc
) (debug
.info
->a
.args
));
2841 RETURN (SCM_SUBRF (proc
) (scm_list_1 (t
.arg1
)));
2844 if (!SCM_SMOB_APPLICABLE_P (proc
))
2846 RETURN (SCM_SMOB_APPLY_1 (proc
, t
.arg1
));
2850 proc
= SCM_CCLO_SUBR (proc
);
2852 debug
.info
->a
.args
= scm_cons (t
.arg1
, debug
.info
->a
.args
);
2853 debug
.info
->a
.proc
= proc
;
2857 proc
= SCM_PROCEDURE (proc
);
2859 debug
.info
->a
.proc
= proc
;
2861 if (!SCM_CLOSUREP (proc
))
2863 if (scm_badformalsp (proc
, 1))
2864 goto umwrongnumargs
;
2865 case scm_tcs_closures
:
2867 x
= SCM_CLOSURE_BODY (proc
);
2869 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
), debug
.info
->a
.args
, SCM_ENV (proc
));
2871 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
), scm_list_1 (t
.arg1
), SCM_ENV (proc
));
2873 goto nontoplevel_begin
;
2874 case scm_tcs_struct
:
2875 if (SCM_OBJ_CLASS_FLAGS (proc
) & SCM_CLASSF_PURE_GENERIC
)
2877 x
= SCM_ENTITY_PROCEDURE (proc
);
2879 arg2
= debug
.info
->a
.args
;
2881 arg2
= scm_list_1 (t
.arg1
);
2885 else if (!SCM_I_OPERATORP (proc
))
2891 proc
= (SCM_I_ENTITYP (proc
)
2892 ? SCM_ENTITY_PROCEDURE (proc
)
2893 : SCM_OPERATOR_PROCEDURE (proc
));
2895 debug
.info
->a
.args
= scm_cons (t
.arg1
, debug
.info
->a
.args
);
2896 debug
.info
->a
.proc
= proc
;
2898 if (SCM_NIMP (proc
))
2903 case scm_tc7_subr_2
:
2904 case scm_tc7_subr_0
:
2905 case scm_tc7_subr_3
:
2906 case scm_tc7_lsubr_2
:
2915 else if (SCM_CONSP (x
))
2917 if (SCM_IMP (SCM_CAR (x
)))
2918 arg2
= SCM_EVALIM (SCM_CAR (x
), env
);
2920 arg2
= EVALCELLCAR (x
, env
);
2925 arg2
= EVALCAR (x
, env
);
2927 { /* have two or more arguments */
2929 debug
.info
->a
.args
= scm_list_2 (t
.arg1
, arg2
);
2932 if (SCM_NULLP (x
)) {
2935 switch (SCM_TYP7 (proc
))
2936 { /* have two arguments */
2937 case scm_tc7_subr_2
:
2938 case scm_tc7_subr_2o
:
2939 RETURN (SCM_SUBRF (proc
) (t
.arg1
, arg2
));
2942 RETURN (SCM_SUBRF (proc
) (debug
.info
->a
.args
));
2944 RETURN (SCM_SUBRF (proc
) (scm_list_2 (t
.arg1
, arg2
)));
2946 case scm_tc7_lsubr_2
:
2947 RETURN (SCM_SUBRF (proc
) (t
.arg1
, arg2
, SCM_EOL
));
2948 case scm_tc7_rpsubr
:
2950 RETURN (SCM_SUBRF (proc
) (t
.arg1
, arg2
));
2952 if (!SCM_SMOB_APPLICABLE_P (proc
))
2954 RETURN (SCM_SMOB_APPLY_2 (proc
, t
.arg1
, arg2
));
2958 RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc
),
2959 scm_cons (proc
, debug
.info
->a
.args
),
2962 RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc
),
2963 scm_cons2 (proc
, t
.arg1
,
2970 case scm_tcs_struct
:
2971 if (SCM_OBJ_CLASS_FLAGS (proc
) & SCM_CLASSF_PURE_GENERIC
)
2973 x
= SCM_ENTITY_PROCEDURE (proc
);
2975 arg2
= debug
.info
->a
.args
;
2977 arg2
= scm_list_2 (t
.arg1
, arg2
);
2981 else if (!SCM_I_OPERATORP (proc
))
2987 RETURN (SCM_APPLY (SCM_I_ENTITYP (proc
)
2988 ? SCM_ENTITY_PROCEDURE (proc
)
2989 : SCM_OPERATOR_PROCEDURE (proc
),
2990 scm_cons (proc
, debug
.info
->a
.args
),
2993 RETURN (SCM_APPLY (SCM_I_ENTITYP (proc
)
2994 ? SCM_ENTITY_PROCEDURE (proc
)
2995 : SCM_OPERATOR_PROCEDURE (proc
),
2996 scm_cons2 (proc
, t
.arg1
,
3004 case scm_tc7_subr_0
:
3006 case scm_tc7_subr_1o
:
3007 case scm_tc7_subr_1
:
3008 case scm_tc7_subr_3
:
3013 proc
= SCM_PROCEDURE (proc
);
3015 debug
.info
->a
.proc
= proc
;
3017 if (!SCM_CLOSUREP (proc
))
3019 if (scm_badformalsp (proc
, 2))
3020 goto umwrongnumargs
;
3021 case scm_tcs_closures
:
3024 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
),
3028 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
),
3029 scm_list_2 (t
.arg1
, arg2
), SCM_ENV (proc
));
3031 x
= SCM_CLOSURE_BODY (proc
);
3032 goto nontoplevel_begin
;
3036 if (SCM_IMP (x
) || !SCM_CONSP (x
))
3040 debug
.info
->a
.args
= scm_cons2 (t
.arg1
, arg2
,
3041 deval_args (x
, env
, proc
, SCM_CDRLOC (SCM_CDR (debug
.info
->a
.args
))));
3045 switch (SCM_TYP7 (proc
))
3046 { /* have 3 or more arguments */
3048 case scm_tc7_subr_3
:
3049 SCM_ASRTGO (SCM_NULLP (SCM_CDR (x
)), wrongnumargs
);
3050 RETURN (SCM_SUBRF (proc
) (t
.arg1
, arg2
,
3051 SCM_CADDR (debug
.info
->a
.args
)));
3053 #ifdef BUILTIN_RPASUBR
3054 t
.arg1
= SCM_SUBRF(proc
)(t
.arg1
, arg2
);
3055 arg2
= SCM_CDDR (debug
.info
->a
.args
);
3058 t
.arg1
= SCM_SUBRF(proc
)(t
.arg1
, SCM_CAR (arg2
));
3059 arg2
= SCM_CDR (arg2
);
3061 while (SCM_NIMP (arg2
));
3063 #endif /* BUILTIN_RPASUBR */
3064 case scm_tc7_rpsubr
:
3065 #ifdef BUILTIN_RPASUBR
3066 if (SCM_FALSEP (SCM_SUBRF (proc
) (t
.arg1
, arg2
)))
3067 RETURN (SCM_BOOL_F
);
3068 t
.arg1
= SCM_CDDR (debug
.info
->a
.args
);
3071 if (SCM_FALSEP (SCM_SUBRF (proc
) (arg2
, SCM_CAR (t
.arg1
))))
3072 RETURN (SCM_BOOL_F
);
3073 arg2
= SCM_CAR (t
.arg1
);
3074 t
.arg1
= SCM_CDR (t
.arg1
);
3076 while (SCM_NIMP (t
.arg1
));
3077 RETURN (SCM_BOOL_T
);
3078 #else /* BUILTIN_RPASUBR */
3079 RETURN (SCM_APPLY (proc
, t
.arg1
,
3081 SCM_CDDR (debug
.info
->a
.args
),
3083 #endif /* BUILTIN_RPASUBR */
3084 case scm_tc7_lsubr_2
:
3085 RETURN (SCM_SUBRF (proc
) (t
.arg1
, arg2
,
3086 SCM_CDDR (debug
.info
->a
.args
)));
3088 RETURN (SCM_SUBRF (proc
) (debug
.info
->a
.args
));
3090 if (!SCM_SMOB_APPLICABLE_P (proc
))
3092 RETURN (SCM_SMOB_APPLY_3 (proc
, t
.arg1
, arg2
,
3093 SCM_CDDR (debug
.info
->a
.args
)));
3097 proc
= SCM_PROCEDURE (proc
);
3098 debug
.info
->a
.proc
= proc
;
3099 if (!SCM_CLOSUREP (proc
))
3101 if (scm_badargsp (SCM_CLOSURE_FORMALS (proc
), debug
.info
->a
.args
))
3102 goto umwrongnumargs
;
3103 case scm_tcs_closures
:
3104 SCM_SET_ARGSREADY (debug
);
3105 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
),
3108 x
= SCM_CLOSURE_BODY (proc
);
3109 goto nontoplevel_begin
;
3111 case scm_tc7_subr_3
:
3112 SCM_ASRTGO (SCM_NULLP (SCM_CDR (x
)), wrongnumargs
);
3113 RETURN (SCM_SUBRF (proc
) (t
.arg1
, arg2
, EVALCAR (x
, env
)));
3115 #ifdef BUILTIN_RPASUBR
3116 t
.arg1
= SCM_SUBRF (proc
) (t
.arg1
, arg2
);
3119 t
.arg1
= SCM_SUBRF(proc
)(t
.arg1
, EVALCAR(x
, env
));
3122 while (SCM_NIMP (x
));
3124 #endif /* BUILTIN_RPASUBR */
3125 case scm_tc7_rpsubr
:
3126 #ifdef BUILTIN_RPASUBR
3127 if (SCM_FALSEP (SCM_SUBRF (proc
) (t
.arg1
, arg2
)))
3128 RETURN (SCM_BOOL_F
);
3131 t
.arg1
= EVALCAR (x
, env
);
3132 if (SCM_FALSEP (SCM_SUBRF (proc
) (arg2
, t
.arg1
)))
3133 RETURN (SCM_BOOL_F
);
3137 while (SCM_NIMP (x
));
3138 RETURN (SCM_BOOL_T
);
3139 #else /* BUILTIN_RPASUBR */
3140 RETURN (SCM_APPLY (proc
, t
.arg1
,
3142 scm_eval_args (x
, env
, proc
),
3144 #endif /* BUILTIN_RPASUBR */
3145 case scm_tc7_lsubr_2
:
3146 RETURN (SCM_SUBRF (proc
) (t
.arg1
, arg2
, scm_eval_args (x
, env
, proc
)));
3148 RETURN (SCM_SUBRF (proc
) (scm_cons2 (t
.arg1
,
3150 scm_eval_args (x
, env
, proc
))));
3152 if (!SCM_SMOB_APPLICABLE_P (proc
))
3154 RETURN (SCM_SMOB_APPLY_3 (proc
, t
.arg1
, arg2
,
3155 scm_eval_args (x
, env
, proc
)));
3159 proc
= SCM_PROCEDURE (proc
);
3160 if (!SCM_CLOSUREP (proc
))
3163 SCM formals
= SCM_CLOSURE_FORMALS (proc
);
3164 if (SCM_NULLP (formals
)
3165 || (SCM_CONSP (formals
)
3166 && (SCM_NULLP (SCM_CDR (formals
))
3167 || (SCM_CONSP (SCM_CDR (formals
))
3168 && scm_badargsp (SCM_CDDR (formals
), x
)))))
3169 goto umwrongnumargs
;
3171 case scm_tcs_closures
:
3173 SCM_SET_ARGSREADY (debug
);
3175 env
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
),
3178 scm_eval_args (x
, env
, proc
)),
3180 x
= SCM_CLOSURE_BODY (proc
);
3181 goto nontoplevel_begin
;
3183 case scm_tcs_struct
:
3184 if (SCM_OBJ_CLASS_FLAGS (proc
) & SCM_CLASSF_PURE_GENERIC
)
3187 arg2
= debug
.info
->a
.args
;
3189 arg2
= scm_cons2 (t
.arg1
, arg2
, scm_eval_args (x
, env
, proc
));
3191 x
= SCM_ENTITY_PROCEDURE (proc
);
3194 else if (!SCM_I_OPERATORP (proc
))
3198 case scm_tc7_subr_2
:
3199 case scm_tc7_subr_1o
:
3200 case scm_tc7_subr_2o
:
3201 case scm_tc7_subr_0
:
3203 case scm_tc7_subr_1
:
3211 if (CHECK_EXIT
&& SCM_TRAPS_P
)
3212 if (SCM_EXIT_FRAME_P
|| (SCM_TRACE_P
&& SCM_TRACED_FRAME_P (debug
)))
3214 SCM_CLEAR_TRACED_FRAME (debug
);
3215 if (SCM_CHEAPTRAPS_P
)
3216 t
.arg1
= scm_make_debugobj (&debug
);
3220 SCM val
= scm_make_continuation (&first
);
3231 scm_call_3 (SCM_EXIT_FRAME_HDLR
, scm_sym_exit_frame
, t
.arg1
, proc
);
3235 scm_last_debug_frame
= debug
.prev
;
3241 /* SECTION: This code is compiled once.
3247 /* Simple procedure calls
3251 scm_call_0 (SCM proc
)
3253 return scm_apply (proc
, SCM_EOL
, SCM_EOL
);
3257 scm_call_1 (SCM proc
, SCM arg1
)
3259 return scm_apply (proc
, arg1
, scm_listofnull
);
3263 scm_call_2 (SCM proc
, SCM arg1
, SCM arg2
)
3265 return scm_apply (proc
, arg1
, scm_cons (arg2
, scm_listofnull
));
3269 scm_call_3 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
)
3271 return scm_apply (proc
, arg1
, scm_cons2 (arg2
, arg3
, scm_listofnull
));
3275 scm_call_4 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM arg4
)
3277 return scm_apply (proc
, arg1
, scm_cons2 (arg2
, arg3
,
3278 scm_cons (arg4
, scm_listofnull
)));
3281 /* Simple procedure applies
3285 scm_apply_0 (SCM proc
, SCM args
)
3287 return scm_apply (proc
, args
, SCM_EOL
);
3291 scm_apply_1 (SCM proc
, SCM arg1
, SCM args
)
3293 return scm_apply (proc
, scm_cons (arg1
, args
), SCM_EOL
);
3297 scm_apply_2 (SCM proc
, SCM arg1
, SCM arg2
, SCM args
)
3299 return scm_apply (proc
, scm_cons2 (arg1
, arg2
, args
), SCM_EOL
);
3303 scm_apply_3 (SCM proc
, SCM arg1
, SCM arg2
, SCM arg3
, SCM args
)
3305 return scm_apply (proc
, scm_cons (arg1
, scm_cons2 (arg2
, arg3
, args
)),
3309 /* This code processes the arguments to apply:
3311 (apply PROC ARG1 ... ARGS)
3313 Given a list (ARG1 ... ARGS), this function conses the ARG1
3314 ... arguments onto the front of ARGS, and returns the resulting
3315 list. Note that ARGS is a list; thus, the argument to this
3316 function is a list whose last element is a list.
3318 Apply calls this function, and applies PROC to the elements of the
3319 result. apply:nconc2last takes care of building the list of
3320 arguments, given (ARG1 ... ARGS).
3322 Rather than do new consing, apply:nconc2last destroys its argument.
3323 On that topic, this code came into my care with the following
3324 beautifully cryptic comment on that topic: "This will only screw
3325 you if you do (scm_apply scm_apply '( ... ))" If you know what
3326 they're referring to, send me a patch to this comment. */
3328 SCM_DEFINE (scm_nconc2last
, "apply:nconc2last", 1, 0, 0,
3330 "Given a list (@var{arg1} @dots{} @var{args}), this function\n"
3331 "conses the @var{arg1} @dots{} arguments onto the front of\n"
3332 "@var{args}, and returns the resulting list. Note that\n"
3333 "@var{args} is a list; thus, the argument to this function is\n"
3334 "a list whose last element is a list.\n"
3335 "Note: Rather than do new consing, @code{apply:nconc2last}\n"
3336 "destroys its argument, so use with care.")
3337 #define FUNC_NAME s_scm_nconc2last
3340 SCM_VALIDATE_NONEMPTYLIST (1,lst
);
3342 while (!SCM_NULLP (SCM_CDR (*lloc
))) /* Perhaps should be
3343 SCM_NULL_OR_NIL_P, but not
3344 needed in 99.99% of cases,
3345 and it could seriously hurt
3346 performance. - Neil */
3347 lloc
= SCM_CDRLOC (*lloc
);
3348 SCM_ASSERT (scm_ilength (SCM_CAR (*lloc
)) >= 0, lst
, SCM_ARG1
, FUNC_NAME
);
3349 *lloc
= SCM_CAR (*lloc
);
3357 /* SECTION: When DEVAL is defined this code yields scm_dapply.
3358 * It is compiled twice.
3363 scm_apply (SCM proc
, SCM arg1
, SCM args
)
3369 scm_dapply (SCM proc
, SCM arg1
, SCM args
)
3374 /* Apply a function to a list of arguments.
3376 This function is exported to the Scheme level as taking two
3377 required arguments and a tail argument, as if it were:
3378 (lambda (proc arg1 . args) ...)
3379 Thus, if you just have a list of arguments to pass to a procedure,
3380 pass the list as ARG1, and '() for ARGS. If you have some fixed
3381 args, pass the first as ARG1, then cons any remaining fixed args
3382 onto the front of your argument list, and pass that as ARGS. */
3385 SCM_APPLY (SCM proc
, SCM arg1
, SCM args
)
3387 #ifdef DEBUG_EXTENSIONS
3389 scm_t_debug_frame debug
;
3390 scm_t_debug_info debug_vect_body
;
3391 debug
.prev
= scm_last_debug_frame
;
3392 debug
.status
= SCM_APPLYFRAME
;
3393 debug
.vect
= &debug_vect_body
;
3394 debug
.vect
[0].a
.proc
= proc
;
3395 debug
.vect
[0].a
.args
= SCM_EOL
;
3396 scm_last_debug_frame
= &debug
;
3399 return scm_dapply (proc
, arg1
, args
);
3403 SCM_ASRTGO (SCM_NIMP (proc
), badproc
);
3405 /* If ARGS is the empty list, then we're calling apply with only two
3406 arguments --- ARG1 is the list of arguments for PROC. Whatever
3407 the case, futz with things so that ARG1 is the first argument to
3408 give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the
3411 Setting the debug apply frame args this way is pretty messy.
3412 Perhaps we should store arg1 and args directly in the frame as
3413 received, and let scm_frame_arguments unpack them, because that's
3414 a relatively rare operation. This works for now; if the Guile
3415 developer archives are still around, see Mikael's post of
3417 if (SCM_NULLP (args
))
3419 if (SCM_NULLP (arg1
))
3421 arg1
= SCM_UNDEFINED
;
3423 debug
.vect
[0].a
.args
= SCM_EOL
;
3429 debug
.vect
[0].a
.args
= arg1
;
3431 args
= SCM_CDR (arg1
);
3432 arg1
= SCM_CAR (arg1
);
3437 args
= scm_nconc2last (args
);
3439 debug
.vect
[0].a
.args
= scm_cons (arg1
, args
);
3443 if (SCM_ENTER_FRAME_P
&& SCM_TRAPS_P
)
3446 if (SCM_CHEAPTRAPS_P
)
3447 tmp
= scm_make_debugobj (&debug
);
3452 tmp
= scm_make_continuation (&first
);
3457 scm_call_2 (SCM_ENTER_FRAME_HDLR
, scm_sym_enter_frame
, tmp
);
3464 switch (SCM_TYP7 (proc
))
3466 case scm_tc7_subr_2o
:
3467 args
= SCM_NULLP (args
) ? SCM_UNDEFINED
: SCM_CAR (args
);
3468 RETURN (SCM_SUBRF (proc
) (arg1
, args
));
3469 case scm_tc7_subr_2
:
3470 SCM_ASRTGO (!SCM_NULLP (args
) && SCM_NULLP (SCM_CDR (args
)),
3472 args
= SCM_CAR (args
);
3473 RETURN (SCM_SUBRF (proc
) (arg1
, args
));
3474 case scm_tc7_subr_0
:
3475 SCM_ASRTGO (SCM_UNBNDP (arg1
), wrongnumargs
);
3476 RETURN (SCM_SUBRF (proc
) ());
3477 case scm_tc7_subr_1
:
3478 SCM_ASRTGO (!SCM_UNBNDP (arg1
), wrongnumargs
);
3479 case scm_tc7_subr_1o
:
3480 SCM_ASRTGO (SCM_NULLP (args
), wrongnumargs
);
3481 RETURN (SCM_SUBRF (proc
) (arg1
));
3483 SCM_ASRTGO (!SCM_UNBNDP (arg1
) && SCM_NULLP (args
), wrongnumargs
);
3484 if (SCM_SUBRF (proc
))
3486 if (SCM_INUMP (arg1
))
3488 RETURN (scm_make_real (SCM_DSUBRF (proc
) ((double) SCM_INUM (arg1
))));
3490 else if (SCM_REALP (arg1
))
3492 RETURN (scm_make_real (SCM_DSUBRF (proc
) (SCM_REAL_VALUE (arg1
))));
3495 else if (SCM_BIGP (arg1
))
3496 RETURN (scm_make_real (SCM_DSUBRF (proc
) (scm_i_big2dbl (arg1
))));
3498 SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc
), arg1
,
3499 SCM_ARG1
, SCM_SYMBOL_CHARS (SCM_SNAME (proc
)));
3501 proc
= SCM_SNAME (proc
);
3503 char *chrs
= SCM_SYMBOL_CHARS (proc
) + SCM_SYMBOL_LENGTH (proc
) - 1;
3504 while ('c' != *--chrs
)
3506 SCM_ASSERT (SCM_CONSP (arg1
),
3507 arg1
, SCM_ARG1
, SCM_SYMBOL_CHARS (proc
));
3508 arg1
= ('a' == *chrs
) ? SCM_CAR (arg1
) : SCM_CDR (arg1
);
3512 case scm_tc7_subr_3
:
3513 SCM_ASRTGO (!SCM_NULLP (args
)
3514 && !SCM_NULLP (SCM_CDR (args
))
3515 && SCM_NULLP (SCM_CDDR (args
)),
3517 RETURN (SCM_SUBRF (proc
) (arg1
, SCM_CAR (args
), SCM_CADR (args
)));
3520 RETURN (SCM_SUBRF (proc
) (SCM_UNBNDP (arg1
) ? SCM_EOL
: debug
.vect
[0].a
.args
));
3522 RETURN (SCM_SUBRF (proc
) (SCM_UNBNDP (arg1
) ? SCM_EOL
: scm_cons (arg1
, args
)));
3524 case scm_tc7_lsubr_2
:
3525 SCM_ASRTGO (SCM_CONSP (args
), wrongnumargs
);
3526 RETURN (SCM_SUBRF (proc
) (arg1
, SCM_CAR (args
), SCM_CDR (args
)));
3528 if (SCM_NULLP (args
))
3529 RETURN (SCM_SUBRF (proc
) (arg1
, SCM_UNDEFINED
));
3530 while (SCM_NIMP (args
))
3532 SCM_ASSERT (SCM_CONSP (args
), args
, SCM_ARG2
, "apply");
3533 arg1
= SCM_SUBRF (proc
) (arg1
, SCM_CAR (args
));
3534 args
= SCM_CDR (args
);
3537 case scm_tc7_rpsubr
:
3538 if (SCM_NULLP (args
))
3539 RETURN (SCM_BOOL_T
);
3540 while (SCM_NIMP (args
))
3542 SCM_ASSERT (SCM_CONSP (args
), args
, SCM_ARG2
, "apply");
3543 if (SCM_FALSEP (SCM_SUBRF (proc
) (arg1
, SCM_CAR (args
))))
3544 RETURN (SCM_BOOL_F
);
3545 arg1
= SCM_CAR (args
);
3546 args
= SCM_CDR (args
);
3548 RETURN (SCM_BOOL_T
);
3549 case scm_tcs_closures
:
3551 arg1
= (SCM_UNBNDP (arg1
) ? SCM_EOL
: debug
.vect
[0].a
.args
);
3553 arg1
= (SCM_UNBNDP (arg1
) ? SCM_EOL
: scm_cons (arg1
, args
));
3555 #ifndef SCM_RECKLESS
3556 if (scm_badargsp (SCM_CLOSURE_FORMALS (proc
), arg1
))
3560 /* Copy argument list */
3565 SCM tl
= args
= scm_cons (SCM_CAR (arg1
), SCM_UNSPECIFIED
);
3566 while (arg1
= SCM_CDR (arg1
), SCM_CONSP (arg1
))
3568 SCM_SETCDR (tl
, scm_cons (SCM_CAR (arg1
),
3572 SCM_SETCDR (tl
, arg1
);
3575 args
= EXTEND_ENV (SCM_CLOSURE_FORMALS (proc
), args
, SCM_ENV (proc
));
3576 proc
= SCM_CLOSURE_BODY (proc
);
3579 while (!SCM_NULLP (arg1
= SCM_CDR (arg1
)))
3581 if (SCM_IMP (SCM_CAR (proc
)))
3583 if (SCM_ISYMP (SCM_CAR (proc
)))
3585 proc
= scm_m_expand_body (proc
, args
);
3589 SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc
));
3592 SCM_CEVAL (SCM_CAR (proc
), args
);
3595 RETURN (EVALCAR (proc
, args
));
3597 if (!SCM_SMOB_APPLICABLE_P (proc
))
3599 if (SCM_UNBNDP (arg1
))
3600 RETURN (SCM_SMOB_APPLY_0 (proc
));
3601 else if (SCM_NULLP (args
))
3602 RETURN (SCM_SMOB_APPLY_1 (proc
, arg1
));
3603 else if (SCM_NULLP (SCM_CDR (args
)))
3604 RETURN (SCM_SMOB_APPLY_2 (proc
, arg1
, SCM_CAR (args
)));
3606 RETURN (SCM_SMOB_APPLY_3 (proc
, arg1
, SCM_CAR (args
), SCM_CDR (args
)));
3609 args
= (SCM_UNBNDP(arg1
) ? SCM_EOL
: debug
.vect
[0].a
.args
);
3611 proc
= SCM_CCLO_SUBR (proc
);
3612 debug
.vect
[0].a
.proc
= proc
;
3613 debug
.vect
[0].a
.args
= scm_cons (arg1
, args
);
3615 args
= (SCM_UNBNDP(arg1
) ? SCM_EOL
: scm_cons (arg1
, args
));
3617 proc
= SCM_CCLO_SUBR (proc
);
3621 proc
= SCM_PROCEDURE (proc
);
3623 debug
.vect
[0].a
.proc
= proc
;
3626 case scm_tcs_struct
:
3627 if (SCM_OBJ_CLASS_FLAGS (proc
) & SCM_CLASSF_PURE_GENERIC
)
3630 args
= (SCM_UNBNDP(arg1
) ? SCM_EOL
: debug
.vect
[0].a
.args
);
3632 args
= (SCM_UNBNDP(arg1
) ? SCM_EOL
: scm_cons (arg1
, args
));
3634 RETURN (scm_apply_generic (proc
, args
));
3636 else if (!SCM_I_OPERATORP (proc
))
3641 args
= (SCM_UNBNDP(arg1
) ? SCM_EOL
: debug
.vect
[0].a
.args
);
3643 args
= (SCM_UNBNDP(arg1
) ? SCM_EOL
: scm_cons (arg1
, args
));
3646 proc
= (SCM_I_ENTITYP (proc
)
3647 ? SCM_ENTITY_PROCEDURE (proc
)
3648 : SCM_OPERATOR_PROCEDURE (proc
));
3650 debug
.vect
[0].a
.proc
= proc
;
3651 debug
.vect
[0].a
.args
= scm_cons (arg1
, args
);
3653 if (SCM_NIMP (proc
))
3659 scm_wrong_num_args (proc
);
3662 scm_wrong_type_arg ("apply", SCM_ARG1
, proc
);
3667 if (CHECK_EXIT
&& SCM_TRAPS_P
)
3668 if (SCM_EXIT_FRAME_P
|| (SCM_TRACE_P
&& SCM_TRACED_FRAME_P (debug
)))
3670 SCM_CLEAR_TRACED_FRAME (debug
);
3671 if (SCM_CHEAPTRAPS_P
)
3672 arg1
= scm_make_debugobj (&debug
);
3676 SCM val
= scm_make_continuation (&first
);
3687 scm_call_3 (SCM_EXIT_FRAME_HDLR
, scm_sym_exit_frame
, arg1
, proc
);
3691 scm_last_debug_frame
= debug
.prev
;
3697 /* SECTION: The rest of this file is only read once.
3702 /* Typechecking for multi-argument MAP and FOR-EACH.
3704 Verify that each element of the vector ARGV, except for the first,
3705 is a proper list whose length is LEN. Attribute errors to WHO,
3706 and claim that the i'th element of ARGV is WHO's i+2'th argument. */
3708 check_map_args (SCM argv
,
3715 SCM
*ve
= SCM_VELTS (argv
);
3718 for (i
= SCM_VECTOR_LENGTH (argv
) - 1; i
>= 1; i
--)
3720 long elt_len
= scm_ilength (ve
[i
]);
3725 scm_apply_generic (gf
, scm_cons (proc
, args
));
3727 scm_wrong_type_arg (who
, i
+ 2, ve
[i
]);
3731 scm_out_of_range (who
, ve
[i
]);
3734 scm_remember_upto_here_1 (argv
);
3738 SCM_GPROC (s_map
, "map", 2, 0, 1, scm_map
, g_map
);
3740 /* Note: Currently, scm_map applies PROC to the argument list(s)
3741 sequentially, starting with the first element(s). This is used in
3742 evalext.c where the Scheme procedure `map-in-order', which guarantees
3743 sequential behaviour, is implemented using scm_map. If the
3744 behaviour changes, we need to update `map-in-order'.
3748 scm_map (SCM proc
, SCM arg1
, SCM args
)
3749 #define FUNC_NAME s_map
3754 SCM
*ve
= &args
; /* Keep args from being optimized away. */
3756 len
= scm_ilength (arg1
);
3757 SCM_GASSERTn (len
>= 0,
3758 g_map
, scm_cons2 (proc
, arg1
, args
), SCM_ARG2
, s_map
);
3759 SCM_VALIDATE_REST_ARGUMENT (args
);
3760 if (SCM_NULLP (args
))
3762 while (SCM_NIMP (arg1
))
3764 *pres
= scm_list_1 (scm_apply (proc
, SCM_CAR (arg1
), scm_listofnull
));
3765 pres
= SCM_CDRLOC (*pres
);
3766 arg1
= SCM_CDR (arg1
);
3770 args
= scm_vector (arg1
= scm_cons (arg1
, args
));
3771 ve
= SCM_VELTS (args
);
3772 #ifndef SCM_RECKLESS
3773 check_map_args (args
, len
, g_map
, proc
, arg1
, s_map
);
3778 for (i
= SCM_VECTOR_LENGTH (args
) - 1; i
>= 0; i
--)
3780 if (SCM_IMP (ve
[i
]))
3782 arg1
= scm_cons (SCM_CAR (ve
[i
]), arg1
);
3783 ve
[i
] = SCM_CDR (ve
[i
]);
3785 *pres
= scm_list_1 (scm_apply (proc
, arg1
, SCM_EOL
));
3786 pres
= SCM_CDRLOC (*pres
);
3792 SCM_GPROC (s_for_each
, "for-each", 2, 0, 1, scm_for_each
, g_for_each
);
3795 scm_for_each (SCM proc
, SCM arg1
, SCM args
)
3796 #define FUNC_NAME s_for_each
3798 SCM
*ve
= &args
; /* Keep args from being optimized away. */
3800 len
= scm_ilength (arg1
);
3801 SCM_GASSERTn (len
>= 0, g_for_each
, scm_cons2 (proc
, arg1
, args
),
3802 SCM_ARG2
, s_for_each
);
3803 SCM_VALIDATE_REST_ARGUMENT (args
);
3804 if (SCM_NULLP (args
))
3806 while (SCM_NIMP (arg1
))
3808 scm_apply (proc
, SCM_CAR (arg1
), scm_listofnull
);
3809 arg1
= SCM_CDR (arg1
);
3811 return SCM_UNSPECIFIED
;
3813 args
= scm_vector (arg1
= scm_cons (arg1
, args
));
3814 ve
= SCM_VELTS (args
);
3815 #ifndef SCM_RECKLESS
3816 check_map_args (args
, len
, g_for_each
, proc
, arg1
, s_for_each
);
3821 for (i
= SCM_VECTOR_LENGTH (args
) - 1; i
>= 0; i
--)
3823 if (SCM_IMP (ve
[i
]))
3824 return SCM_UNSPECIFIED
;
3825 arg1
= scm_cons (SCM_CAR (ve
[i
]), arg1
);
3826 ve
[i
] = SCM_CDR (ve
[i
]);
3828 scm_apply (proc
, arg1
, SCM_EOL
);
3835 scm_closure (SCM code
, SCM env
)
3838 SCM closcar
= scm_cons (code
, SCM_EOL
);
3839 z
= scm_alloc_cell (SCM_UNPACK (closcar
) + scm_tc3_closure
,
3841 scm_remember_upto_here (closcar
);
3846 scm_t_bits scm_tc16_promise
;
3849 scm_makprom (SCM code
)
3851 SCM_RETURN_NEWSMOB (scm_tc16_promise
, SCM_UNPACK (code
));
3857 promise_print (SCM exp
, SCM port
, scm_print_state
*pstate
)
3859 int writingp
= SCM_WRITINGP (pstate
);
3860 scm_puts ("#<promise ", port
);
3861 SCM_SET_WRITINGP (pstate
, 1);
3862 scm_iprin1 (SCM_CELL_OBJECT_1 (exp
), port
, pstate
);
3863 SCM_SET_WRITINGP (pstate
, writingp
);
3864 scm_putc ('>', port
);
3869 SCM_DEFINE (scm_force
, "force", 1, 0, 0,
3871 "If the promise @var{x} has not been computed yet, compute and\n"
3872 "return @var{x}, otherwise just return the previously computed\n"
3874 #define FUNC_NAME s_scm_force
3876 SCM_VALIDATE_SMOB (1, x
, promise
);
3877 if (!((1L << 16) & SCM_CELL_WORD_0 (x
)))
3879 SCM ans
= scm_call_0 (SCM_CELL_OBJECT_1 (x
));
3880 if (!((1L << 16) & SCM_CELL_WORD_0 (x
)))
3883 SCM_SET_CELL_OBJECT_1 (x
, ans
);
3884 SCM_SET_CELL_WORD_0 (x
, SCM_CELL_WORD_0 (x
) | (1L << 16));
3888 return SCM_CELL_OBJECT_1 (x
);
3893 SCM_DEFINE (scm_promise_p
, "promise?", 1, 0, 0,
3895 "Return true if @var{obj} is a promise, i.e. a delayed computation\n"
3896 "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).")
3897 #define FUNC_NAME s_scm_promise_p
3899 return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise
, obj
));
3904 SCM_DEFINE (scm_cons_source
, "cons-source", 3, 0, 0,
3905 (SCM xorig
, SCM x
, SCM y
),
3906 "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n"
3907 "Any source properties associated with @var{xorig} are also associated\n"
3908 "with the new pair.")
3909 #define FUNC_NAME s_scm_cons_source
3912 z
= scm_cons (x
, y
);
3913 /* Copy source properties possibly associated with xorig. */
3914 p
= scm_whash_lookup (scm_source_whash
, xorig
);
3916 scm_whash_insert (scm_source_whash
, z
, p
);
3922 SCM_DEFINE (scm_copy_tree
, "copy-tree", 1, 0, 0,
3924 "Recursively copy the data tree that is bound to @var{obj}, and return a\n"
3925 "pointer to the new data structure. @code{copy-tree} recurses down the\n"
3926 "contents of both pairs and vectors (since both cons cells and vector\n"
3927 "cells may point to arbitrary objects), and stops recursing when it hits\n"
3928 "any other object.")
3929 #define FUNC_NAME s_scm_copy_tree
3934 if (SCM_VECTORP (obj
))
3936 unsigned long i
= SCM_VECTOR_LENGTH (obj
);
3937 ans
= scm_c_make_vector (i
, SCM_UNSPECIFIED
);
3939 SCM_VELTS (ans
)[i
] = scm_copy_tree (SCM_VELTS (obj
)[i
]);
3942 if (!SCM_CONSP (obj
))
3944 ans
= tl
= scm_cons_source (obj
,
3945 scm_copy_tree (SCM_CAR (obj
)),
3947 while (obj
= SCM_CDR (obj
), SCM_CONSP (obj
))
3949 SCM_SETCDR (tl
, scm_cons (scm_copy_tree (SCM_CAR (obj
)),
3953 SCM_SETCDR (tl
, obj
);
3959 /* We have three levels of EVAL here:
3961 - scm_i_eval (exp, env)
3963 evaluates EXP in environment ENV. ENV is a lexical environment
3964 structure as used by the actual tree code evaluator. When ENV is
3965 a top-level environment, then changes to the current module are
3966 tracked by updating ENV so that it continues to be in sync with
3969 - scm_primitive_eval (exp)
3971 evaluates EXP in the top-level environment as determined by the
3972 current module. This is done by constructing a suitable
3973 environment and calling scm_i_eval. Thus, changes to the
3974 top-level module are tracked normally.
3976 - scm_eval (exp, mod)
3978 evaluates EXP while MOD is the current module. This is done by
3979 setting the current module to MOD, invoking scm_primitive_eval on
3980 EXP, and then restoring the current module to the value it had
3981 previously. That is, while EXP is evaluated, changes to the
3982 current module are tracked, but these changes do not persist when
3985 For each level of evals, there are two variants, distinguished by a
3986 _x suffix: the ordinary variant does not modify EXP while the _x
3987 variant can destructively modify EXP into something completely
3988 unintelligible. A Scheme data structure passed as EXP to one of the
3989 _x variants should not ever be used again for anything. So when in
3990 doubt, use the ordinary variant.
3995 scm_i_eval_x (SCM exp
, SCM env
)
3997 return SCM_XEVAL (exp
, env
);
4001 scm_i_eval (SCM exp
, SCM env
)
4003 exp
= scm_copy_tree (exp
);
4004 return SCM_XEVAL (exp
, env
);
4008 scm_primitive_eval_x (SCM exp
)
4011 SCM transformer
= scm_current_module_transformer ();
4012 if (SCM_NIMP (transformer
))
4013 exp
= scm_call_1 (transformer
, exp
);
4014 env
= scm_top_level_env (scm_current_module_lookup_closure ());
4015 return scm_i_eval_x (exp
, env
);
4018 SCM_DEFINE (scm_primitive_eval
, "primitive-eval", 1, 0, 0,
4020 "Evaluate @var{exp} in the top-level environment specified by\n"
4021 "the current module.")
4022 #define FUNC_NAME s_scm_primitive_eval
4025 SCM transformer
= scm_current_module_transformer ();
4026 if (SCM_NIMP (transformer
))
4027 exp
= scm_call_1 (transformer
, exp
);
4028 env
= scm_top_level_env (scm_current_module_lookup_closure ());
4029 return scm_i_eval (exp
, env
);
4033 /* Eval does not take the second arg optionally. This is intentional
4034 * in order to be R5RS compatible, and to prepare for the new module
4035 * system, where we would like to make the choice of evaluation
4036 * environment explicit. */
4039 change_environment (void *data
)
4041 SCM pair
= SCM_PACK (data
);
4042 SCM new_module
= SCM_CAR (pair
);
4043 SCM old_module
= scm_current_module ();
4044 SCM_SETCDR (pair
, old_module
);
4045 scm_set_current_module (new_module
);
4050 restore_environment (void *data
)
4052 SCM pair
= SCM_PACK (data
);
4053 SCM old_module
= SCM_CDR (pair
);
4054 SCM new_module
= scm_current_module ();
4055 SCM_SETCAR (pair
, new_module
);
4056 scm_set_current_module (old_module
);
4060 inner_eval_x (void *data
)
4062 return scm_primitive_eval_x (SCM_PACK(data
));
4066 scm_eval_x (SCM exp
, SCM module
)
4067 #define FUNC_NAME "eval!"
4069 SCM_VALIDATE_MODULE (2, module
);
4071 return scm_internal_dynamic_wind
4072 (change_environment
, inner_eval_x
, restore_environment
,
4073 (void *) SCM_UNPACK (exp
),
4074 (void *) SCM_UNPACK (scm_cons (module
, SCM_BOOL_F
)));
4079 inner_eval (void *data
)
4081 return scm_primitive_eval (SCM_PACK(data
));
4084 SCM_DEFINE (scm_eval
, "eval", 2, 0, 0,
4085 (SCM exp
, SCM module
),
4086 "Evaluate @var{exp}, a list representing a Scheme expression,\n"
4087 "in the top-level environment specified by @var{module}.\n"
4088 "While @var{exp} is evaluated (using @code{primitive-eval}),\n"
4089 "@var{module} is made the current module. The current module\n"
4090 "is reset to its previous value when @var{eval} returns.")
4091 #define FUNC_NAME s_scm_eval
4093 SCM_VALIDATE_MODULE (2, module
);
4095 return scm_internal_dynamic_wind
4096 (change_environment
, inner_eval
, restore_environment
,
4097 (void *) SCM_UNPACK (exp
),
4098 (void *) SCM_UNPACK (scm_cons (module
, SCM_BOOL_F
)));
4103 /* At this point, scm_deval and scm_dapply are generated.
4106 #ifdef DEBUG_EXTENSIONS
4116 scm_init_opts (scm_evaluator_traps
,
4117 scm_evaluator_trap_table
,
4118 SCM_N_EVALUATOR_TRAPS
);
4119 scm_init_opts (scm_eval_options_interface
,
4121 SCM_N_EVAL_OPTIONS
);
4123 scm_tc16_promise
= scm_make_smob_type ("promise", 0);
4124 scm_set_smob_mark (scm_tc16_promise
, scm_markcdr
);
4125 scm_set_smob_print (scm_tc16_promise
, promise_print
);
4127 /* Dirk:Fixme:: make scm_undefineds local to eval.c: it's only used here. */
4128 scm_undefineds
= scm_list_1 (SCM_UNDEFINED
);
4129 SCM_SETCDR (scm_undefineds
, scm_undefineds
);
4130 scm_listofnull
= scm_list_1 (SCM_EOL
);
4132 scm_f_apply
= scm_c_define_subr ("apply", scm_tc7_lsubr_2
, scm_apply
);
4137 #ifndef SCM_MAGIC_SNARFER
4138 #include "libguile/eval.x"
4141 scm_add_feature ("delay");