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d0b07b5d | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
73be1d9e MV |
8 | * This library 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 GNU | |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
1bbd0b84 | 17 | |
0f2d19dd JB |
18 | \f |
19 | ||
6dbd0af5 MD |
20 | /* This file is read twice in order to produce debugging versions of |
21 | * scm_ceval and scm_apply. These functions, scm_deval and | |
22 | * scm_dapply, are produced when we define the preprocessor macro | |
23 | * DEVAL. The file is divided into sections which are treated | |
24 | * differently with respect to DEVAL. The heads of these sections are | |
25 | * marked with the string "SECTION:". | |
26 | */ | |
27 | ||
6dbd0af5 | 28 | /* SECTION: This code is compiled once. |
0f2d19dd JB |
29 | */ |
30 | ||
3d05f2e0 RB |
31 | #if HAVE_CONFIG_H |
32 | # include <config.h> | |
33 | #endif | |
0f2d19dd | 34 | |
3d05f2e0 RB |
35 | #include "libguile/__scm.h" |
36 | ||
37 | #ifndef DEVAL | |
d16332b3 | 38 | |
48b96f4b JB |
39 | /* AIX requires this to be the first thing in the file. The #pragma |
40 | directive is indented so pre-ANSI compilers will ignore it, rather | |
41 | than choke on it. */ | |
5862b540 | 42 | #ifndef __GNUC__ |
48b96f4b JB |
43 | # if HAVE_ALLOCA_H |
44 | # include <alloca.h> | |
45 | # else | |
46 | # ifdef _AIX | |
ac13d9d2 | 47 | # pragma alloca |
48b96f4b JB |
48 | # else |
49 | # ifndef alloca /* predefined by HP cc +Olibcalls */ | |
50 | char *alloca (); | |
51 | # endif | |
52 | # endif | |
53 | # endif | |
54 | #endif | |
55 | ||
a0599745 MD |
56 | #include "libguile/_scm.h" |
57 | #include "libguile/debug.h" | |
09074dbf | 58 | #include "libguile/dynwind.h" |
a0599745 MD |
59 | #include "libguile/alist.h" |
60 | #include "libguile/eq.h" | |
61 | #include "libguile/continuations.h" | |
756414cf | 62 | #include "libguile/futures.h" |
e6729603 | 63 | #include "libguile/strings.h" |
a0599745 MD |
64 | #include "libguile/throw.h" |
65 | #include "libguile/smob.h" | |
66 | #include "libguile/macros.h" | |
67 | #include "libguile/procprop.h" | |
68 | #include "libguile/hashtab.h" | |
69 | #include "libguile/hash.h" | |
70 | #include "libguile/srcprop.h" | |
71 | #include "libguile/stackchk.h" | |
72 | #include "libguile/objects.h" | |
73 | #include "libguile/async.h" | |
74 | #include "libguile/feature.h" | |
75 | #include "libguile/modules.h" | |
76 | #include "libguile/ports.h" | |
77 | #include "libguile/root.h" | |
78 | #include "libguile/vectors.h" | |
549e6ec6 | 79 | #include "libguile/fluids.h" |
f12745b6 | 80 | #include "libguile/goops.h" |
a513ead3 | 81 | #include "libguile/values.h" |
a0599745 MD |
82 | |
83 | #include "libguile/validate.h" | |
84 | #include "libguile/eval.h" | |
c96d76b8 | 85 | #include "libguile/lang.h" |
89efbff4 | 86 | |
0f2d19dd JB |
87 | \f |
88 | ||
e6729603 DH |
89 | /* {Syntax Errors} |
90 | * | |
91 | * This section defines the message strings for the syntax errors that can be | |
92 | * detected during memoization and the functions and macros that shall be | |
93 | * called by the memoizer code to signal syntax errors. */ | |
94 | ||
95 | ||
96 | /* Syntax errors that can be detected during memoization: */ | |
97 | ||
98 | /* Circular or improper lists do not form valid scheme expressions. If a | |
99 | * circular list or an improper list is detected in a place where a scheme | |
100 | * expression is expected, a 'Bad expression' error is signalled. */ | |
101 | static const char s_bad_expression[] = "Bad expression"; | |
102 | ||
cc56ba80 | 103 | /* If a form is detected that holds less expressions than are required in that |
8ae95199 | 104 | * context, a 'Missing expression' error is signalled. */ |
cc56ba80 DH |
105 | static const char s_missing_expression[] = "Missing expression in"; |
106 | ||
609a8b86 | 107 | /* If a form is detected that holds more expressions than are allowed in that |
8ae95199 | 108 | * context, an 'Extra expression' error is signalled. */ |
609a8b86 DH |
109 | static const char s_extra_expression[] = "Extra expression in"; |
110 | ||
2a6f7afe DH |
111 | /* Case or cond expressions must have at least one clause. If a case or cond |
112 | * expression without any clauses is detected, a 'Missing clauses' error is | |
113 | * signalled. */ | |
114 | static const char s_missing_clauses[] = "Missing clauses"; | |
115 | ||
609a8b86 DH |
116 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
117 | * last clause. If after the 'else' case clause further clauses are detected, | |
118 | * a 'Misplaced else clause' error is signalled. */ | |
119 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
120 | ||
2a6f7afe DH |
121 | /* If a case clause is detected that is not in the format |
122 | * (<label(s)> <expression1> <expression2> ...) | |
123 | * a 'Bad case clause' error is signalled. */ | |
124 | static const char s_bad_case_clause[] = "Bad case clause"; | |
125 | ||
2a6f7afe DH |
126 | /* If a case clause is detected where the <label(s)> element is neither a |
127 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
128 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
129 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
130 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
131 | * local or global environment, it is not considered a syntactic keyword, but | |
132 | * will be treated as any other variable. */ | |
133 | static const char s_bad_case_labels[] = "Bad case labels"; | |
134 | ||
135 | /* In a case statement all labels have to be distinct. If in a case statement | |
136 | * a label occurs more than once, a 'Duplicate case label' error is | |
137 | * signalled. */ | |
138 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
139 | ||
609a8b86 DH |
140 | /* If a cond clause is detected that is not in one of the formats |
141 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
142 | * a 'Bad cond clause' error is signalled. */ | |
143 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
144 | ||
145 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
146 | * not hold a recipient element for the test result, a 'Missing recipient' | |
147 | * error is signalled. */ | |
148 | static const char s_missing_recipient[] = "Missing recipient in"; | |
149 | ||
cc56ba80 DH |
150 | /* If in a position where a variable name is required some other object is |
151 | * detected, a 'Bad variable' error is signalled. */ | |
152 | static const char s_bad_variable[] = "Bad variable"; | |
153 | ||
a954ce1d DH |
154 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
155 | * possibly empty list. If any other object is detected in a place where a | |
156 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
157 | static const char s_bad_bindings[] = "Bad bindings"; | |
158 | ||
159 | /* Depending on the syntactic context, a binding has to be in the format | |
160 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
161 | * If anything else is detected in a place where a binding was expected, a | |
162 | * 'Bad binding' error is signalled. */ | |
163 | static const char s_bad_binding[] = "Bad binding"; | |
164 | ||
165 | /* If the exit form of a 'do' expression is not in the format | |
166 | * (<test> <expression> ...) | |
167 | * a 'Bad exit clause' error is signalled. */ | |
168 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
169 | ||
e6729603 DH |
170 | |
171 | /* Signal a syntax error. We distinguish between the form that caused the | |
172 | * error and the enclosing expression. The error message will print out as | |
173 | * shown in the following pattern. The file name and line number are only | |
174 | * given when they can be determined from the erroneous form or from the | |
175 | * enclosing expression. | |
176 | * | |
177 | * <filename>: In procedure memoization: | |
178 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
179 | ||
180 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
181 | ||
182 | /* The prototype is needed to indicate that the function does not return. */ | |
183 | static void | |
184 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
185 | ||
186 | static void | |
187 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
188 | { | |
189 | const SCM msg_string = scm_makfrom0str (msg); | |
190 | SCM filename = SCM_BOOL_F; | |
191 | SCM linenr = SCM_BOOL_F; | |
192 | const char *format; | |
193 | SCM args; | |
194 | ||
195 | if (SCM_CONSP (form)) | |
196 | { | |
197 | filename = scm_source_property (form, scm_sym_filename); | |
198 | linenr = scm_source_property (form, scm_sym_line); | |
199 | } | |
200 | ||
201 | if (SCM_FALSEP (filename) && SCM_FALSEP (linenr) && SCM_CONSP (expr)) | |
202 | { | |
203 | filename = scm_source_property (expr, scm_sym_filename); | |
204 | linenr = scm_source_property (expr, scm_sym_line); | |
205 | } | |
206 | ||
207 | if (!SCM_UNBNDP (expr)) | |
208 | { | |
209 | if (!SCM_FALSEP (filename)) | |
210 | { | |
211 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
212 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
213 | } | |
214 | else if (!SCM_FALSEP (linenr)) | |
215 | { | |
216 | format = "In line ~S: ~A ~S in expression ~S."; | |
217 | args = scm_list_4 (linenr, msg_string, form, expr); | |
218 | } | |
219 | else | |
220 | { | |
221 | format = "~A ~S in expression ~S."; | |
222 | args = scm_list_3 (msg_string, form, expr); | |
223 | } | |
224 | } | |
225 | else | |
226 | { | |
227 | if (!SCM_FALSEP (filename)) | |
228 | { | |
229 | format = "In file ~S, line ~S: ~A ~S."; | |
230 | args = scm_list_4 (filename, linenr, msg_string, form); | |
231 | } | |
232 | else if (!SCM_FALSEP (linenr)) | |
233 | { | |
234 | format = "In line ~S: ~A ~S."; | |
235 | args = scm_list_3 (linenr, msg_string, form); | |
236 | } | |
237 | else | |
238 | { | |
239 | format = "~A ~S."; | |
240 | args = scm_list_2 (msg_string, form); | |
241 | } | |
242 | } | |
243 | ||
244 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
245 | } | |
246 | ||
247 | ||
248 | /* Shortcut macros to simplify syntax error handling. */ | |
249 | #define ASSERT_SYNTAX(cond, message, form) \ | |
250 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
251 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
252 | { if (!(cond)) syntax_error (message, form, expr); } | |
253 | ||
254 | \f | |
255 | ||
d0624e39 DH |
256 | /* {Ilocs} |
257 | * | |
258 | * Ilocs are memoized references to variables in local environment frames. | |
259 | * They are represented as three values: The relative offset of the | |
260 | * environment frame, the number of the binding within that frame, and a | |
261 | * boolean value indicating whether the binding is the last binding in the | |
262 | * frame. | |
263 | */ | |
264 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) | |
265 | #define SCM_IDINC (0x00100000L) | |
266 | #define SCM_IDSTMSK (-SCM_IDINC) | |
267 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ | |
268 | SCM_PACK ( \ | |
269 | ((frame_nr) << 8) \ | |
270 | + ((binding_nr) << 20) \ | |
271 | + ((last_p) ? SCM_ICDR : 0) \ | |
272 | + scm_tc8_iloc ) | |
273 | ||
274 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) | |
275 | ||
276 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
277 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, | |
278 | (SCM frame, SCM binding, SCM cdrp), | |
279 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
280 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
281 | #define FUNC_NAME s_scm_dbg_make_iloc | |
282 | { | |
283 | SCM_VALIDATE_INUM (1, frame); | |
284 | SCM_VALIDATE_INUM (2, binding); | |
285 | return SCM_MAKE_ILOC (SCM_INUM (frame), | |
286 | SCM_INUM (binding), | |
287 | !SCM_FALSEP (cdrp)); | |
288 | } | |
289 | #undef FUNC_NAME | |
290 | ||
291 | SCM scm_dbg_iloc_p (SCM obj); | |
292 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, | |
293 | (SCM obj), | |
294 | "Return @code{#t} if @var{obj} is an iloc.") | |
295 | #define FUNC_NAME s_scm_dbg_iloc_p | |
296 | { | |
297 | return SCM_BOOL (SCM_ILOCP (obj)); | |
298 | } | |
299 | #undef FUNC_NAME | |
300 | ||
301 | #endif | |
302 | ||
303 | \f | |
304 | ||
17fa3fcf DH |
305 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
306 | do { \ | |
307 | if (SCM_EQ_P ((x), SCM_EOL)) \ | |
e90c3a89 | 308 | scm_misc_error (NULL, s_expression, SCM_EOL); \ |
17fa3fcf DH |
309 | } while (0) |
310 | ||
311 | \f | |
312 | ||
6dbd0af5 MD |
313 | /* The evaluator contains a plethora of EVAL symbols. |
314 | * This is an attempt at explanation. | |
315 | * | |
316 | * The following macros should be used in code which is read twice | |
317 | * (where the choice of evaluator is hard soldered): | |
318 | * | |
319 | * SCM_CEVAL is the symbol used within one evaluator to call itself. | |
320 | * Originally, it is defined to scm_ceval, but is redefined to | |
321 | * scm_deval during the second pass. | |
322 | * | |
6cb702da | 323 | * SCM_EVALIM is used when it is known that the expression is an |
6dbd0af5 MD |
324 | * immediate. (This macro never calls an evaluator.) |
325 | * | |
326 | * EVALCAR evaluates the car of an expression. | |
327 | * | |
6dbd0af5 MD |
328 | * The following macros should be used in code which is read once |
329 | * (where the choice of evaluator is dynamic): | |
330 | * | |
6cb702da | 331 | * SCM_XEVAL takes care of immediates without calling an evaluator. It |
6dbd0af5 MD |
332 | * then calls scm_ceval *or* scm_deval, depending on the debugging |
333 | * mode. | |
334 | * | |
6cb702da | 335 | * SCM_XEVALCAR corresponds to EVALCAR, but uses scm_ceval *or* scm_deval |
6dbd0af5 MD |
336 | * depending on the debugging mode. |
337 | * | |
338 | * The main motivation for keeping this plethora is efficiency | |
339 | * together with maintainability (=> locality of code). | |
340 | */ | |
341 | ||
6cb702da | 342 | #define SCM_CEVAL scm_ceval |
0f2d19dd | 343 | |
e90c3a89 DH |
344 | #define SCM_EVALIM2(x) \ |
345 | ((SCM_EQ_P ((x), SCM_EOL) \ | |
346 | ? scm_misc_error (NULL, s_expression, SCM_EOL), 0 \ | |
347 | : 0), \ | |
348 | (x)) | |
349 | ||
350 | #define SCM_EVALIM(x, env) (SCM_ILOCP (x) \ | |
351 | ? *scm_ilookup ((x), env) \ | |
352 | : SCM_EVALIM2(x)) | |
353 | ||
354 | #define SCM_XEVAL(x, env) (SCM_IMP (x) \ | |
355 | ? SCM_EVALIM2(x) \ | |
356 | : (*scm_ceval_ptr) ((x), (env))) | |
357 | ||
358 | #define SCM_XEVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ | |
359 | ? SCM_EVALIM (SCM_CAR (x), env) \ | |
360 | : (SCM_SYMBOLP (SCM_CAR (x)) \ | |
361 | ? *scm_lookupcar (x, env, 1) \ | |
362 | : (*scm_ceval_ptr) (SCM_CAR (x), env))) | |
363 | ||
8c494e99 | 364 | #define EVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ |
904a077d | 365 | ? SCM_EVALIM (SCM_CAR (x), env) \ |
680516ba DH |
366 | : (SCM_SYMBOLP (SCM_CAR (x)) \ |
367 | ? *scm_lookupcar (x, env, 1) \ | |
368 | : SCM_CEVAL (SCM_CAR (x), env))) | |
0f2d19dd | 369 | |
28d52ebb | 370 | SCM_REC_MUTEX (source_mutex); |
9bc4701c | 371 | |
12841895 | 372 | |
e90c3a89 DH |
373 | static const char s_expression[] = "missing or extra expression"; |
374 | static const char s_test[] = "bad test"; | |
375 | static const char s_body[] = "bad body"; | |
376 | static const char s_bindings[] = "bad bindings"; | |
377 | static const char s_duplicate_bindings[] = "duplicate bindings"; | |
378 | static const char s_variable[] = "bad variable"; | |
379 | static const char s_clauses[] = "bad or missing clauses"; | |
380 | static const char s_formals[] = "bad formals"; | |
381 | static const char s_duplicate_formals[] = "duplicate formals"; | |
382 | static const char s_splicing[] = "bad (non-list) result for unquote-splicing"; | |
383 | ||
384 | ||
12841895 DH |
385 | /* Lookup a given local variable in an environment. The local variable is |
386 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
387 | * indicates the relative number of the environment frame (counting upwards | |
388 | * from the innermost environment frame), binding indicates the number of the | |
389 | * binding within the frame, and last? (which is extracted from the iloc using | |
390 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
391 | * very end of the improper list of bindings. */ | |
0f2d19dd | 392 | SCM * |
6e8d25a6 | 393 | scm_ilookup (SCM iloc, SCM env) |
0f2d19dd | 394 | { |
12841895 DH |
395 | unsigned int frame_nr = SCM_IFRAME (iloc); |
396 | unsigned int binding_nr = SCM_IDIST (iloc); | |
397 | SCM frames = env; | |
398 | SCM bindings; | |
399 | ||
400 | for (; 0 != frame_nr; --frame_nr) | |
401 | frames = SCM_CDR (frames); | |
402 | ||
403 | bindings = SCM_CAR (frames); | |
404 | for (; 0 != binding_nr; --binding_nr) | |
405 | bindings = SCM_CDR (bindings); | |
406 | ||
0f2d19dd | 407 | if (SCM_ICDRP (iloc)) |
12841895 DH |
408 | return SCM_CDRLOC (bindings); |
409 | return SCM_CARLOC (SCM_CDR (bindings)); | |
0f2d19dd | 410 | } |
0f2d19dd | 411 | |
12841895 | 412 | |
f8769b1d MV |
413 | /* The Lookup Car Race |
414 | - by Eva Luator | |
415 | ||
416 | Memoization of variables and special forms is done while executing | |
417 | the code for the first time. As long as there is only one thread | |
418 | everything is fine, but as soon as two threads execute the same | |
419 | code concurrently `for the first time' they can come into conflict. | |
420 | ||
421 | This memoization includes rewriting variable references into more | |
422 | efficient forms and expanding macros. Furthermore, macro expansion | |
423 | includes `compiling' special forms like `let', `cond', etc. into | |
424 | tree-code instructions. | |
425 | ||
426 | There shouldn't normally be a problem with memoizing local and | |
904a077d | 427 | global variable references (into ilocs and variables), because all |
f8769b1d MV |
428 | threads will mutate the code in *exactly* the same way and (if I |
429 | read the C code correctly) it is not possible to observe a half-way | |
430 | mutated cons cell. The lookup procedure can handle this | |
431 | transparently without any critical sections. | |
432 | ||
433 | It is different with macro expansion, because macro expansion | |
434 | happens outside of the lookup procedure and can't be | |
904a077d MV |
435 | undone. Therefore the lookup procedure can't cope with it. It has |
436 | to indicate failure when it detects a lost race and hope that the | |
437 | caller can handle it. Luckily, it turns out that this is the case. | |
f8769b1d | 438 | |
904a077d | 439 | An example to illustrate this: Suppose that the following form will |
f8769b1d MV |
440 | be memoized concurrently by two threads |
441 | ||
442 | (let ((x 12)) x) | |
443 | ||
444 | Let's first examine the lookup of X in the body. The first thread | |
445 | decides that it has to find the symbol "x" in the environment and | |
446 | starts to scan it. Then the other thread takes over and actually | |
447 | overtakes the first. It looks up "x" and substitutes an | |
448 | appropriate iloc for it. Now the first thread continues and | |
449 | completes its lookup. It comes to exactly the same conclusions as | |
450 | the second one and could - without much ado - just overwrite the | |
451 | iloc with the same iloc. | |
452 | ||
453 | But let's see what will happen when the race occurs while looking | |
454 | up the symbol "let" at the start of the form. It could happen that | |
455 | the second thread interrupts the lookup of the first thread and not | |
904a077d MV |
456 | only substitutes a variable for it but goes right ahead and |
457 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
458 | the first thread completes its lookup, it would replace the #@let* | |
459 | with a variable containing the "let" binding, effectively reverting | |
460 | the form to (let (x 12) x). This is wrong. It has to detect that | |
461 | it has lost the race and the evaluator has to reconsider the | |
462 | changed form completely. | |
f8769b1d MV |
463 | |
464 | This race condition could be resolved with some kind of traffic | |
465 | light (like mutexes) around scm_lookupcar, but I think that it is | |
466 | best to avoid them in this case. They would serialize memoization | |
467 | completely and because lookup involves calling arbitrary Scheme | |
468 | code (via the lookup-thunk), threads could be blocked for an | |
469 | arbitrary amount of time or even deadlock. But with the current | |
470 | solution a lot of unnecessary work is potentially done. */ | |
471 | ||
9aa82b39 | 472 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to |
f8769b1d MV |
473 | return NULL to indicate a failed lookup due to some race conditions |
474 | between threads. This only happens when VLOC is the first cell of | |
475 | a special form that will eventually be memoized (like `let', etc.) | |
476 | In that case the whole lookup is bogus and the caller has to | |
477 | reconsider the complete special form. | |
478 | ||
479 | SCM_LOOKUPCAR is still there, of course. It just calls | |
de513fa0 | 480 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR |
f8769b1d MV |
481 | should only be called when it is known that VLOC is not the first |
482 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
26d5b9b4 MD |
483 | for NULL. I think I've found the only places where this |
484 | applies. */ | |
f8769b1d | 485 | |
f25f761d GH |
486 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); |
487 | ||
8ecf1f13 | 488 | static SCM * |
26d5b9b4 | 489 | scm_lookupcar1 (SCM vloc, SCM genv, int check) |
0f2d19dd JB |
490 | { |
491 | SCM env = genv; | |
e3173f93 | 492 | register SCM *al, fl, var = SCM_CAR (vloc); |
0f2d19dd | 493 | register SCM iloc = SCM_ILOC00; |
0f2d19dd JB |
494 | for (; SCM_NIMP (env); env = SCM_CDR (env)) |
495 | { | |
790071cd | 496 | if (!SCM_CONSP (SCM_CAR (env))) |
0f2d19dd | 497 | break; |
a23afe53 | 498 | al = SCM_CARLOC (env); |
0f2d19dd JB |
499 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) |
500 | { | |
01f11e02 | 501 | if (!SCM_CONSP (fl)) |
33b97402 | 502 | { |
cf498326 | 503 | if (SCM_EQ_P (fl, var)) |
0f2d19dd | 504 | { |
cf498326 | 505 | if (! SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 506 | goto race; |
3201d763 | 507 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); |
a23afe53 | 508 | return SCM_CDRLOC (*al); |
0f2d19dd | 509 | } |
33b97402 MD |
510 | else |
511 | break; | |
512 | } | |
a23afe53 | 513 | al = SCM_CDRLOC (*al); |
cf498326 | 514 | if (SCM_EQ_P (SCM_CAR (fl), var)) |
0f2d19dd | 515 | { |
0f2d19dd JB |
516 | if (SCM_UNBNDP (SCM_CAR (*al))) |
517 | { | |
518 | env = SCM_EOL; | |
519 | goto errout; | |
520 | } | |
c6772927 | 521 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 522 | goto race; |
a23afe53 | 523 | SCM_SETCAR (vloc, iloc); |
a23afe53 | 524 | return SCM_CARLOC (*al); |
0f2d19dd | 525 | } |
3201d763 | 526 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); |
0f2d19dd | 527 | } |
3201d763 | 528 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); |
0f2d19dd JB |
529 | } |
530 | { | |
86d31dfe | 531 | SCM top_thunk, real_var; |
790071cd | 532 | if (SCM_NIMP (env)) |
0f2d19dd | 533 | { |
86d31dfe MV |
534 | top_thunk = SCM_CAR (env); /* env now refers to a |
535 | top level env thunk */ | |
0f2d19dd JB |
536 | env = SCM_CDR (env); |
537 | } | |
538 | else | |
539 | top_thunk = SCM_BOOL_F; | |
86d31dfe MV |
540 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); |
541 | if (SCM_FALSEP (real_var)) | |
0f2d19dd | 542 | goto errout; |
86d31dfe | 543 | |
01f11e02 | 544 | if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
86d31dfe MV |
545 | { |
546 | errout: | |
86d31dfe MV |
547 | if (check) |
548 | { | |
549 | if (SCM_NULLP (env)) | |
550 | scm_error (scm_unbound_variable_key, NULL, | |
551 | "Unbound variable: ~S", | |
8ea46249 | 552 | scm_list_1 (var), SCM_BOOL_F); |
86d31dfe MV |
553 | else |
554 | scm_misc_error (NULL, "Damaged environment: ~S", | |
8ea46249 | 555 | scm_list_1 (var)); |
86d31dfe MV |
556 | } |
557 | else | |
558 | { | |
559 | /* A variable could not be found, but we shall | |
560 | not throw an error. */ | |
561 | static SCM undef_object = SCM_UNDEFINED; | |
562 | return &undef_object; | |
563 | } | |
09e4d064 | 564 | } |
86d31dfe | 565 | |
c6772927 | 566 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
86d31dfe MV |
567 | { |
568 | /* Some other thread has changed the very cell we are working | |
569 | on. In effect, it must have done our job or messed it up | |
570 | completely. */ | |
571 | race: | |
572 | var = SCM_CAR (vloc); | |
d22a0ea1 MV |
573 | if (SCM_VARIABLEP (var)) |
574 | return SCM_VARIABLE_LOC (var); | |
86d31dfe MV |
575 | if (SCM_ITAG7 (var) == SCM_ITAG7 (SCM_ILOC00)) |
576 | return scm_ilookup (var, genv); | |
904a077d | 577 | /* We can't cope with anything else than variables and ilocs. When |
86d31dfe MV |
578 | a special form has been memoized (i.e. `let' into `#@let') we |
579 | return NULL and expect the calling function to do the right | |
580 | thing. For the evaluator, this means going back and redoing | |
581 | the dispatch on the car of the form. */ | |
582 | return NULL; | |
583 | } | |
f8769b1d | 584 | |
d22a0ea1 | 585 | SCM_SETCAR (vloc, real_var); |
86d31dfe MV |
586 | return SCM_VARIABLE_LOC (real_var); |
587 | } | |
0f2d19dd JB |
588 | } |
589 | ||
f8769b1d | 590 | SCM * |
6e8d25a6 | 591 | scm_lookupcar (SCM vloc, SCM genv, int check) |
f8769b1d | 592 | { |
26d5b9b4 | 593 | SCM *loc = scm_lookupcar1 (vloc, genv, check); |
f8769b1d MV |
594 | if (loc == NULL) |
595 | abort (); | |
596 | return loc; | |
597 | } | |
f8769b1d | 598 | |
2a6f7afe DH |
599 | /* Return true if the symbol is - from the point of view of a macro |
600 | * transformer - a literal in the sense specified in chapter "pattern | |
601 | * language" of R5RS. In the code below, however, we don't match the | |
602 | * definition of R5RS exactly: It returns true if the identifier has no | |
603 | * binding or if it is a syntactic keyword. */ | |
604 | static int | |
605 | literal_p (const SCM symbol, const SCM env) | |
606 | { | |
607 | const SCM x = scm_cons (symbol, SCM_UNDEFINED); | |
608 | const SCM value = *scm_lookupcar (x, env, 0); | |
609 | if (SCM_UNBNDP (value) || SCM_MACROP (value)) | |
610 | return 1; | |
611 | else | |
612 | return 0; | |
613 | } | |
614 | ||
0f2d19dd | 615 | #define unmemocar scm_unmemocar |
1cc91f1b | 616 | |
86d31dfe MV |
617 | SCM_SYMBOL (sym_three_question_marks, "???"); |
618 | ||
0f2d19dd | 619 | SCM |
6e8d25a6 | 620 | scm_unmemocar (SCM form, SCM env) |
0f2d19dd | 621 | { |
302c12b4 | 622 | if (!SCM_CONSP (form)) |
0f2d19dd | 623 | return form; |
302c12b4 | 624 | else |
d22a0ea1 | 625 | { |
302c12b4 DH |
626 | SCM c = SCM_CAR (form); |
627 | if (SCM_VARIABLEP (c)) | |
628 | { | |
629 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
630 | if (SCM_FALSEP (sym)) | |
631 | sym = sym_three_question_marks; | |
632 | SCM_SETCAR (form, sym); | |
633 | } | |
302c12b4 DH |
634 | else if (SCM_ILOCP (c)) |
635 | { | |
636 | unsigned long int ir; | |
637 | ||
638 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
639 | env = SCM_CDR (env); | |
640 | env = SCM_CAAR (env); | |
641 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
642 | env = SCM_CDR (env); | |
643 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); | |
644 | } | |
302c12b4 DH |
645 | return form; |
646 | } | |
0f2d19dd JB |
647 | } |
648 | ||
1cc91f1b | 649 | |
0f2d19dd | 650 | SCM |
6e8d25a6 | 651 | scm_eval_car (SCM pair, SCM env) |
0f2d19dd | 652 | { |
6cb702da | 653 | return SCM_XEVALCAR (pair, env); |
0f2d19dd JB |
654 | } |
655 | ||
656 | \f | |
657 | /* | |
658 | * The following rewrite expressions and | |
659 | * some memoized forms have different syntax | |
660 | */ | |
661 | ||
85db4a2c DH |
662 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
663 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); | |
664 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
81123e6d | 665 | |
85db4a2c DH |
666 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); |
667 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
668 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
669 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
0f2d19dd | 670 | |
0f2d19dd | 671 | |
26d5b9b4 MD |
672 | /* Check that the body denoted by XORIG is valid and rewrite it into |
673 | its internal form. The internal form of a body is just the body | |
674 | itself, but prefixed with an ISYM that denotes to what kind of | |
675 | outer construct this body belongs. A lambda body starts with | |
676 | SCM_IM_LAMBDA, for example, a body of a let starts with SCM_IM_LET, | |
677 | etc. The one exception is a body that belongs to a letrec that has | |
678 | been formed by rewriting internal defines: it starts with | |
679 | SCM_IM_DEFINE. */ | |
680 | ||
681 | /* XXX - Besides controlling the rewriting of internal defines, the | |
682 | additional ISYM could be used for improved error messages. | |
683 | This is not done yet. */ | |
684 | ||
685 | static SCM | |
6e8d25a6 | 686 | scm_m_body (SCM op, SCM xorig, const char *what) |
26d5b9b4 | 687 | { |
e90c3a89 | 688 | SCM_ASSYNT (scm_ilength (xorig) >= 1, s_body, what); |
26d5b9b4 MD |
689 | |
690 | /* Don't add another ISYM if one is present already. */ | |
691 | if (SCM_ISYMP (SCM_CAR (xorig))) | |
692 | return xorig; | |
693 | ||
694 | /* Retain possible doc string. */ | |
44d3cb0d | 695 | if (!SCM_CONSP (SCM_CAR (xorig))) |
26d5b9b4 | 696 | { |
8ea46249 | 697 | if (!SCM_NULLP (SCM_CDR (xorig))) |
26d5b9b4 | 698 | return scm_cons (SCM_CAR (xorig), |
8ea46249 | 699 | scm_m_body (op, SCM_CDR (xorig), what)); |
26d5b9b4 MD |
700 | return xorig; |
701 | } | |
702 | ||
ab66ae47 | 703 | return scm_cons (op, xorig); |
26d5b9b4 MD |
704 | } |
705 | ||
1cc91f1b | 706 | |
9fbee57e | 707 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
708 | |
709 | ||
3b88ed2a | 710 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 711 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 712 | |
8ea46249 | 713 | SCM |
e6729603 | 714 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 715 | { |
e6729603 DH |
716 | const SCM cdr_expr = SCM_CDR (expr); |
717 | const long length = scm_ilength (cdr_expr); | |
718 | ||
719 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
720 | ||
721 | if (length == 0) | |
722 | { | |
723 | /* Special case: (and) is replaced by #t. */ | |
724 | return SCM_BOOL_T; | |
725 | } | |
0f2d19dd | 726 | else |
e6729603 DH |
727 | { |
728 | SCM_SETCAR (expr, SCM_IM_AND); | |
729 | return expr; | |
730 | } | |
0f2d19dd JB |
731 | } |
732 | ||
1cc91f1b | 733 | |
3b88ed2a | 734 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 735 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
736 | |
737 | SCM | |
2a6f7afe | 738 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 739 | { |
2a6f7afe DH |
740 | const SCM cdr_expr = SCM_CDR (expr); |
741 | ||
742 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
743 | ||
744 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
745 | return expr; | |
0f2d19dd JB |
746 | } |
747 | ||
748 | ||
3b88ed2a | 749 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 750 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
1cc91f1b | 751 | |
8ea46249 | 752 | SCM |
2a6f7afe | 753 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 754 | { |
8ea46249 | 755 | SCM clauses; |
2a6f7afe DH |
756 | SCM all_labels = SCM_EOL; |
757 | ||
758 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
759 | const int else_literal_p = literal_p (scm_sym_else, env); | |
760 | ||
761 | const SCM cdr_expr = SCM_CDR (expr); | |
762 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
763 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
764 | ||
765 | clauses = SCM_CDR (cdr_expr); | |
8ea46249 | 766 | while (!SCM_NULLP (clauses)) |
0f2d19dd | 767 | { |
2a6f7afe DH |
768 | SCM labels; |
769 | ||
770 | const SCM clause = SCM_CAR (clauses); | |
771 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
772 | s_bad_case_clause, clause, expr); | |
773 | ||
774 | labels = SCM_CAR (clause); | |
775 | if (SCM_CONSP (labels)) | |
776 | { | |
777 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
778 | s_bad_case_labels, labels, expr); | |
779 | all_labels = scm_append_x (scm_list_2 (labels, all_labels)); | |
780 | } | |
58a2510b DH |
781 | else if (SCM_NULLP (labels)) |
782 | { | |
783 | /* The list of labels is empty. According to R5RS this is allowed. | |
784 | * It means that the sequence of expressions will never be executed. | |
785 | * Therefore, as an optimization, we could remove the whole | |
786 | * clause. */ | |
787 | } | |
2a6f7afe DH |
788 | else |
789 | { | |
790 | ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p, | |
791 | s_bad_case_labels, labels, expr); | |
792 | ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)), | |
609a8b86 | 793 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
794 | } |
795 | ||
796 | /* build the new clause */ | |
797 | if (SCM_EQ_P (labels, scm_sym_else)) | |
798 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
799 | ||
8ea46249 | 800 | clauses = SCM_CDR (clauses); |
0f2d19dd | 801 | } |
2a6f7afe DH |
802 | |
803 | /* Check whether all case labels are distinct. */ | |
804 | for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels)) | |
805 | { | |
806 | const SCM label = SCM_CAR (all_labels); | |
807 | SCM label_idx = SCM_CDR (all_labels); | |
808 | for (; !SCM_NULLP (label_idx); label_idx = SCM_CDR (label_idx)) | |
809 | { | |
810 | ASSERT_SYNTAX_2 (!SCM_EQ_P (SCM_CAR (label_idx), label), | |
811 | s_duplicate_case_label, label, expr); | |
812 | } | |
813 | } | |
814 | ||
815 | SCM_SETCAR (expr, SCM_IM_CASE); | |
816 | return expr; | |
0f2d19dd JB |
817 | } |
818 | ||
819 | ||
3b88ed2a | 820 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 821 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 822 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 823 | |
8ea46249 | 824 | SCM |
609a8b86 | 825 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 826 | { |
609a8b86 DH |
827 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
828 | const int else_literal_p = literal_p (scm_sym_else, env); | |
829 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
830 | ||
831 | const SCM clauses = SCM_CDR (expr); | |
832 | SCM clause_idx; | |
833 | ||
834 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
835 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
836 | ||
837 | for (clause_idx = clauses; | |
838 | !SCM_NULLP (clause_idx); | |
839 | clause_idx = SCM_CDR (clause_idx)) | |
0f2d19dd | 840 | { |
609a8b86 DH |
841 | SCM test; |
842 | ||
843 | const SCM clause = SCM_CAR (clause_idx); | |
844 | const long length = scm_ilength (clause); | |
845 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
846 | ||
847 | test = SCM_CAR (clause); | |
848 | if (SCM_EQ_P (test, scm_sym_else) && else_literal_p) | |
0f2d19dd | 849 | { |
609a8b86 DH |
850 | const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx)); |
851 | ASSERT_SYNTAX_2 (length >= 2, | |
852 | s_bad_cond_clause, clause, expr); | |
853 | ASSERT_SYNTAX_2 (last_clause_p, | |
854 | s_misplaced_else_clause, clause, expr); | |
855 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 856 | } |
609a8b86 DH |
857 | else if (length >= 2 |
858 | && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow) | |
859 | && arrow_literal_p) | |
860 | { | |
861 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
862 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
863 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 864 | } |
0f2d19dd | 865 | } |
609a8b86 DH |
866 | |
867 | SCM_SETCAR (expr, SCM_IM_COND); | |
868 | return expr; | |
0f2d19dd JB |
869 | } |
870 | ||
1cc91f1b | 871 | |
3b88ed2a | 872 | SCM_SYNTAX(s_define, "define", scm_i_makbimacro, scm_m_define); |
9fbee57e | 873 | SCM_GLOBAL_SYMBOL(scm_sym_define, s_define); |
5280aaca | 874 | |
9fbee57e DH |
875 | /* Guile provides an extension to R5RS' define syntax to represent function |
876 | * currying in a compact way. With this extension, it is allowed to write | |
877 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
878 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
879 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
880 | * should be either a sequence of zero or more variables, or a sequence of one | |
881 | * or more variables followed by a space-delimited period and another | |
882 | * variable. Each level of argument nesting wraps the <body> within another | |
883 | * lambda expression. For example, the following forms are allowed, each one | |
884 | * followed by an equivalent, more explicit implementation. | |
885 | * Example 1: | |
886 | * (define ((a b . c) . d) <body>) is equivalent to | |
887 | * (define a (lambda (b . c) (lambda d <body>))) | |
888 | * Example 2: | |
889 | * (define (((a) b) c . d) <body>) is equivalent to | |
890 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
891 | */ | |
892 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
893 | * module that does not implement this extension. */ | |
894 | SCM | |
cc56ba80 | 895 | scm_m_define (SCM expr, SCM env) |
5280aaca | 896 | { |
cc56ba80 DH |
897 | SCM body; |
898 | SCM variable; | |
899 | ||
900 | const SCM cdr_expr = SCM_CDR (expr); | |
901 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
902 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
903 | ||
904 | body = SCM_CDR (cdr_expr); | |
905 | variable = SCM_CAR (cdr_expr); | |
906 | while (SCM_CONSP (variable)) | |
5280aaca | 907 | { |
cc56ba80 DH |
908 | /* This while loop realizes function currying by variable nesting. |
909 | * Variable is known to be a nested-variable. In every iteration of the | |
910 | * loop another level of lambda expression is created, starting with the | |
911 | * innermost one. */ | |
912 | const SCM formals = SCM_CDR (variable); | |
913 | const SCM tail = scm_cons (formals, body); | |
914 | ||
915 | /* Add source properties to each new lambda expression: */ | |
916 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
917 | ||
918 | body = scm_list_1 (lambda); | |
919 | variable = SCM_CAR (variable); | |
5280aaca | 920 | } |
cc56ba80 DH |
921 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); |
922 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
923 | ||
9fbee57e | 924 | if (SCM_TOP_LEVEL (env)) |
0f2d19dd | 925 | { |
9fbee57e | 926 | SCM var; |
cc56ba80 | 927 | const SCM value = scm_eval_car (body, env); |
9fbee57e DH |
928 | if (SCM_REC_PROCNAMES_P) |
929 | { | |
cc56ba80 | 930 | SCM tmp = value; |
9fbee57e DH |
931 | while (SCM_MACROP (tmp)) |
932 | tmp = SCM_MACRO_CODE (tmp); | |
933 | if (SCM_CLOSUREP (tmp) | |
934 | /* Only the first definition determines the name. */ | |
935 | && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name))) | |
cc56ba80 | 936 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); |
9fbee57e | 937 | } |
cc56ba80 DH |
938 | var = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); |
939 | SCM_VARIABLE_SET (var, value); | |
9fbee57e | 940 | return SCM_UNSPECIFIED; |
26d5b9b4 | 941 | } |
9fbee57e | 942 | else |
cc56ba80 DH |
943 | { |
944 | SCM_SETCAR (expr, SCM_IM_DEFINE); | |
945 | SCM_SETCAR (cdr_expr, variable); | |
946 | SCM_SETCDR (cdr_expr, body); | |
947 | return expr; | |
948 | } | |
0f2d19dd JB |
949 | } |
950 | ||
951 | ||
8ae95199 DH |
952 | /* This is a helper function for forms (<keyword> <expression>) that are |
953 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
954 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
955 | * ('() <memoized_expression>) tail of the memoized form. */ | |
956 | static SCM | |
957 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
958 | { | |
959 | const SCM cdr_expr = SCM_CDR (expr); | |
960 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
961 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
962 | ||
963 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
964 | ||
965 | return expr; | |
966 | } | |
967 | ||
968 | ||
3b88ed2a | 969 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 970 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 971 | |
9fbee57e DH |
972 | /* Promises are implemented as closures with an empty parameter list. Thus, |
973 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
974 | * the empty list represents the empty parameter list. This representation | |
975 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 976 | SCM |
8ae95199 | 977 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 978 | { |
8ae95199 DH |
979 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
980 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
981 | return new_expr; | |
0f2d19dd JB |
982 | } |
983 | ||
8ea46249 | 984 | |
a954ce1d DH |
985 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
986 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
987 | ||
302c12b4 DH |
988 | /* DO gets the most radically altered syntax. The order of the vars is |
989 | * reversed here. In contrast, the order of the inits and steps is reversed | |
990 | * during the evaluation: | |
991 | ||
0f2d19dd | 992 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
993 | (<var2> <init2>) |
994 | ... ) | |
995 | (<test> <return>) | |
996 | <body>) | |
302c12b4 | 997 | |
0f2d19dd | 998 | ;; becomes |
302c12b4 | 999 | |
e681d187 | 1000 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1001 | (varn ... var2 var1) |
1002 | (<test> <return>) | |
1003 | (<body>) | |
1004 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1005 | */ |
0f2d19dd | 1006 | SCM |
a954ce1d | 1007 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1008 | { |
a954ce1d DH |
1009 | SCM variables = SCM_EOL; |
1010 | SCM init_forms = SCM_EOL; | |
1011 | SCM step_forms = SCM_EOL; | |
1012 | SCM binding_idx; | |
1013 | SCM cddr_expr; | |
1014 | SCM exit_clause; | |
1015 | SCM commands; | |
1016 | SCM tail; | |
1017 | ||
1018 | const SCM cdr_expr = SCM_CDR (expr); | |
1019 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1020 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1021 | ||
1022 | /* Collect variables, init and step forms. */ | |
1023 | binding_idx = SCM_CAR (cdr_expr); | |
1024 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1025 | s_bad_bindings, binding_idx, expr); | |
1026 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1027 | { |
a954ce1d DH |
1028 | const SCM binding = SCM_CAR (binding_idx); |
1029 | const long length = scm_ilength (binding); | |
1030 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1031 | s_bad_binding, binding, expr); | |
1032 | ||
302c12b4 | 1033 | { |
a954ce1d DH |
1034 | const SCM name = SCM_CAR (binding); |
1035 | const SCM init = SCM_CADR (binding); | |
1036 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
1037 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
1038 | variables = scm_cons (name, variables); | |
1039 | init_forms = scm_cons (init, init_forms); | |
1040 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1041 | } |
0f2d19dd | 1042 | } |
a954ce1d DH |
1043 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1044 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1045 | ||
1046 | /* Memoize the test form and the exit sequence. */ | |
1047 | cddr_expr = SCM_CDR (cdr_expr); | |
1048 | exit_clause = SCM_CAR (cddr_expr); | |
1049 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1050 | s_bad_exit_clause, exit_clause, expr); | |
1051 | ||
1052 | commands = SCM_CDR (cddr_expr); | |
1053 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1054 | tail = scm_cons2 (init_forms, variables, tail); | |
1055 | SCM_SETCAR (expr, SCM_IM_DO); | |
1056 | SCM_SETCDR (expr, tail); | |
1057 | return expr; | |
0f2d19dd JB |
1058 | } |
1059 | ||
b8229a3b | 1060 | |
3b88ed2a | 1061 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1062 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1063 | |
9fbee57e DH |
1064 | SCM |
1065 | scm_m_if (SCM xorig, SCM env SCM_UNUSED) | |
0f2d19dd | 1066 | { |
9fbee57e | 1067 | long len = scm_ilength (SCM_CDR (xorig)); |
e90c3a89 | 1068 | SCM_ASSYNT (len >= 2 && len <= 3, s_expression, s_if); |
9fbee57e | 1069 | return scm_cons (SCM_IM_IF, SCM_CDR (xorig)); |
0f2d19dd JB |
1070 | } |
1071 | ||
302c12b4 | 1072 | |
3b88ed2a | 1073 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1074 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1075 | |
9fbee57e DH |
1076 | /* Return true if OBJ is `eq?' to one of the elements of LIST or to the |
1077 | * cdr of the last cons. (Thus, LIST is not required to be a proper | |
1078 | * list and OBJ can also be found in the improper ending.) */ | |
1079 | static int | |
1080 | scm_c_improper_memq (SCM obj, SCM list) | |
5cb22e96 | 1081 | { |
9fbee57e DH |
1082 | for (; SCM_CONSP (list); list = SCM_CDR (list)) |
1083 | { | |
1084 | if (SCM_EQ_P (SCM_CAR (list), obj)) | |
1085 | return 1; | |
1086 | } | |
1087 | return SCM_EQ_P (list, obj); | |
5cb22e96 DH |
1088 | } |
1089 | ||
28d52ebb | 1090 | SCM |
9fbee57e | 1091 | scm_m_lambda (SCM xorig, SCM env SCM_UNUSED) |
28d52ebb | 1092 | { |
9fbee57e DH |
1093 | SCM formals; |
1094 | SCM x = SCM_CDR (xorig); | |
28d52ebb | 1095 | |
e90c3a89 | 1096 | SCM_ASSYNT (SCM_CONSP (x), s_formals, s_lambda); |
1cc91f1b | 1097 | |
9fbee57e DH |
1098 | formals = SCM_CAR (x); |
1099 | while (SCM_CONSP (formals)) | |
0f2d19dd | 1100 | { |
9fbee57e | 1101 | SCM formal = SCM_CAR (formals); |
e90c3a89 | 1102 | SCM_ASSYNT (SCM_SYMBOLP (formal), s_formals, s_lambda); |
9fbee57e | 1103 | if (scm_c_improper_memq (formal, SCM_CDR (formals))) |
e90c3a89 | 1104 | scm_misc_error (s_lambda, s_duplicate_formals, SCM_EOL); |
9fbee57e | 1105 | formals = SCM_CDR (formals); |
0f2d19dd | 1106 | } |
9fbee57e | 1107 | if (!SCM_NULLP (formals) && !SCM_SYMBOLP (formals)) |
e90c3a89 | 1108 | scm_misc_error (s_lambda, s_formals, SCM_EOL); |
9fbee57e DH |
1109 | |
1110 | return scm_cons2 (SCM_IM_LAMBDA, SCM_CAR (x), | |
1111 | scm_m_body (SCM_IM_LAMBDA, SCM_CDR (x), s_lambda)); | |
0f2d19dd | 1112 | } |
6dbd0af5 | 1113 | |
0f2d19dd | 1114 | |
302c12b4 DH |
1115 | /* The bindings ((v1 i1) (v2 i2) ... (vn in)) are transformed to the lists |
1116 | * (vn ... v2 v1) and (i1 i2 ... in). That is, the list of variables is | |
1117 | * reversed here, the list of inits gets reversed during evaluation. */ | |
1118 | static void | |
1119 | transform_bindings (SCM bindings, SCM *rvarloc, SCM *initloc, const char *what) | |
0f2d19dd | 1120 | { |
302c12b4 DH |
1121 | SCM rvars = SCM_EOL; |
1122 | *rvarloc = SCM_EOL; | |
1123 | *initloc = SCM_EOL; | |
1124 | ||
e90c3a89 | 1125 | SCM_ASSYNT (scm_ilength (bindings) >= 1, s_bindings, what); |
0f2d19dd | 1126 | |
0f2d19dd JB |
1127 | do |
1128 | { | |
302c12b4 | 1129 | SCM binding = SCM_CAR (bindings); |
e90c3a89 DH |
1130 | SCM_ASSYNT (scm_ilength (binding) == 2, s_bindings, what); |
1131 | SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding)), s_variable, what); | |
302c12b4 | 1132 | if (scm_c_improper_memq (SCM_CAR (binding), rvars)) |
e90c3a89 | 1133 | scm_misc_error (what, s_duplicate_bindings, SCM_EOL); |
302c12b4 DH |
1134 | rvars = scm_cons (SCM_CAR (binding), rvars); |
1135 | *initloc = scm_list_1 (SCM_CADR (binding)); | |
a23afe53 | 1136 | initloc = SCM_CDRLOC (*initloc); |
302c12b4 | 1137 | bindings = SCM_CDR (bindings); |
0f2d19dd | 1138 | } |
302c12b4 | 1139 | while (!SCM_NULLP (bindings)); |
26d5b9b4 | 1140 | |
302c12b4 | 1141 | *rvarloc = rvars; |
0f2d19dd JB |
1142 | } |
1143 | ||
302c12b4 | 1144 | |
3b88ed2a | 1145 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1146 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1147 | |
302c12b4 | 1148 | SCM |
6e8d25a6 | 1149 | scm_m_let (SCM xorig, SCM env) |
0f2d19dd | 1150 | { |
302c12b4 DH |
1151 | SCM x = SCM_CDR (xorig); |
1152 | SCM temp; | |
1153 | ||
e90c3a89 | 1154 | SCM_ASSYNT (SCM_CONSP (x), s_bindings, s_let); |
302c12b4 DH |
1155 | temp = SCM_CAR (x); |
1156 | if (SCM_NULLP (temp) | |
1157 | || (scm_ilength (temp) == 1 && SCM_CONSP (SCM_CAR (temp)))) | |
26d5b9b4 MD |
1158 | { |
1159 | /* null or single binding, let* is faster */ | |
3096b33f | 1160 | SCM bindings = temp; |
302c12b4 | 1161 | SCM body = scm_m_body (SCM_IM_LET, SCM_CDR (x), s_let); |
3096b33f | 1162 | return scm_m_letstar (scm_cons2 (SCM_CAR (xorig), bindings, body), env); |
26d5b9b4 | 1163 | } |
302c12b4 | 1164 | else if (SCM_CONSP (temp)) |
26d5b9b4 | 1165 | { |
3096b33f DH |
1166 | /* plain let */ |
1167 | SCM bindings = temp; | |
302c12b4 | 1168 | SCM rvars, inits, body; |
3096b33f | 1169 | transform_bindings (bindings, &rvars, &inits, "let"); |
302c12b4 DH |
1170 | body = scm_m_body (SCM_IM_LET, SCM_CDR (x), "let"); |
1171 | return scm_cons2 (SCM_IM_LET, rvars, scm_cons (inits, body)); | |
26d5b9b4 | 1172 | } |
302c12b4 DH |
1173 | else |
1174 | { | |
1175 | /* named let: Transform (let name ((var init) ...) body ...) into | |
1176 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) */ | |
26d5b9b4 | 1177 | |
302c12b4 DH |
1178 | SCM name = temp; |
1179 | SCM vars = SCM_EOL; | |
1180 | SCM *varloc = &vars; | |
1181 | SCM inits = SCM_EOL; | |
1182 | SCM *initloc = &inits; | |
1183 | SCM bindings; | |
1184 | ||
e90c3a89 | 1185 | SCM_ASSYNT (SCM_SYMBOLP (name), s_bindings, s_let); |
302c12b4 | 1186 | x = SCM_CDR (x); |
e90c3a89 | 1187 | SCM_ASSYNT (SCM_CONSP (x), s_bindings, s_let); |
302c12b4 | 1188 | bindings = SCM_CAR (x); |
e90c3a89 | 1189 | SCM_ASSYNT (scm_ilength (bindings) >= 0, s_bindings, s_let); |
302c12b4 DH |
1190 | while (!SCM_NULLP (bindings)) |
1191 | { /* vars and inits both in order */ | |
1192 | SCM binding = SCM_CAR (bindings); | |
e90c3a89 DH |
1193 | SCM_ASSYNT (scm_ilength (binding) == 2, s_bindings, s_let); |
1194 | SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding)), s_variable, s_let); | |
302c12b4 DH |
1195 | *varloc = scm_list_1 (SCM_CAR (binding)); |
1196 | varloc = SCM_CDRLOC (*varloc); | |
1197 | *initloc = scm_list_1 (SCM_CADR (binding)); | |
1198 | initloc = SCM_CDRLOC (*initloc); | |
1199 | bindings = SCM_CDR (bindings); | |
1200 | } | |
26d5b9b4 | 1201 | |
302c12b4 DH |
1202 | { |
1203 | SCM lambda_body = scm_m_body (SCM_IM_LET, SCM_CDR (x), "let"); | |
1204 | SCM lambda_form = scm_cons2 (scm_sym_lambda, vars, lambda_body); | |
1205 | SCM rvar = scm_list_1 (name); | |
1206 | SCM init = scm_list_1 (lambda_form); | |
1207 | SCM body = scm_m_body (SCM_IM_LET, scm_list_1 (name), "let"); | |
1208 | SCM letrec = scm_cons2 (SCM_IM_LETREC, rvar, scm_cons (init, body)); | |
1209 | return scm_cons (letrec, inits); | |
1210 | } | |
1211 | } | |
0f2d19dd JB |
1212 | } |
1213 | ||
1214 | ||
3b88ed2a | 1215 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1216 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1217 | |
9fbee57e DH |
1218 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vk and initializers |
1219 | * i1 .. ik is transformed into the form (#@let* (v1 i1 v2 i2 ...) body*). */ | |
1220 | SCM | |
1221 | scm_m_letstar (SCM xorig, SCM env SCM_UNUSED) | |
0f2d19dd | 1222 | { |
9fbee57e DH |
1223 | SCM bindings; |
1224 | SCM x = SCM_CDR (xorig); | |
1225 | SCM vars = SCM_EOL; | |
1226 | SCM *varloc = &vars; | |
0f2d19dd | 1227 | |
e90c3a89 | 1228 | SCM_ASSYNT (SCM_CONSP (x), s_bindings, s_letstar); |
9fbee57e DH |
1229 | |
1230 | bindings = SCM_CAR (x); | |
e90c3a89 | 1231 | SCM_ASSYNT (scm_ilength (bindings) >= 0, s_bindings, s_letstar); |
9fbee57e DH |
1232 | while (!SCM_NULLP (bindings)) |
1233 | { | |
1234 | SCM binding = SCM_CAR (bindings); | |
e90c3a89 DH |
1235 | SCM_ASSYNT (scm_ilength (binding) == 2, s_bindings, s_letstar); |
1236 | SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (binding)), s_variable, s_letstar); | |
9fbee57e DH |
1237 | *varloc = scm_list_2 (SCM_CAR (binding), SCM_CADR (binding)); |
1238 | varloc = SCM_CDRLOC (SCM_CDR (*varloc)); | |
1239 | bindings = SCM_CDR (bindings); | |
1240 | } | |
1241 | ||
1242 | return scm_cons2 (SCM_IM_LETSTAR, vars, | |
1243 | scm_m_body (SCM_IM_LETSTAR, SCM_CDR (x), s_letstar)); | |
1244 | } | |
b8229a3b | 1245 | |
0f2d19dd | 1246 | |
3b88ed2a | 1247 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); |
9fbee57e | 1248 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); |
1cc91f1b | 1249 | |
0f2d19dd | 1250 | SCM |
9fbee57e | 1251 | scm_m_letrec (SCM xorig, SCM env) |
0f2d19dd | 1252 | { |
9fbee57e | 1253 | SCM x = SCM_CDR (xorig); |
e90c3a89 | 1254 | SCM_ASSYNT (SCM_CONSP (x), s_bindings, s_letrec); |
9fbee57e DH |
1255 | |
1256 | if (SCM_NULLP (SCM_CAR (x))) | |
1257 | { | |
1258 | /* null binding, let* faster */ | |
1259 | SCM body = scm_m_body (SCM_IM_LETREC, SCM_CDR (x), s_letrec); | |
1260 | return scm_m_letstar (scm_cons2 (SCM_CAR (xorig), SCM_EOL, body), env); | |
1261 | } | |
1262 | else | |
1263 | { | |
1264 | SCM rvars, inits, body; | |
1265 | transform_bindings (SCM_CAR (x), &rvars, &inits, "letrec"); | |
1266 | body = scm_m_body (SCM_IM_LETREC, SCM_CDR (x), "letrec"); | |
1267 | return scm_cons2 (SCM_IM_LETREC, rvars, scm_cons (inits, body)); | |
1268 | } | |
0f2d19dd JB |
1269 | } |
1270 | ||
73b64342 | 1271 | |
3b88ed2a | 1272 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1273 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1274 | |
1275 | SCM | |
9fbee57e | 1276 | scm_m_or (SCM xorig, SCM env SCM_UNUSED) |
73b64342 | 1277 | { |
c014a02e | 1278 | long len = scm_ilength (SCM_CDR (xorig)); |
e90c3a89 | 1279 | SCM_ASSYNT (len >= 0, s_test, s_or); |
9fbee57e DH |
1280 | if (len >= 1) |
1281 | return scm_cons (SCM_IM_OR, SCM_CDR (xorig)); | |
1282 | else | |
1283 | return SCM_BOOL_F; | |
73b64342 MD |
1284 | } |
1285 | ||
73b64342 | 1286 | |
9fbee57e DH |
1287 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1288 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
1289 | ||
1290 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1291 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1292 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1293 | * nesting level and is known to be greater than zero. */ | |
1294 | static SCM | |
1295 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1296 | { |
9fbee57e | 1297 | if (SCM_CONSP (form)) |
c96d76b8 | 1298 | { |
9fbee57e DH |
1299 | SCM tmp = SCM_CAR (form); |
1300 | if (SCM_EQ_P (tmp, scm_sym_quasiquote)) | |
1301 | { | |
1302 | SCM args = SCM_CDR (form); | |
e90c3a89 | 1303 | SCM_ASSYNT (scm_ilength (args) == 1, s_expression, s_quasiquote); |
9fbee57e DH |
1304 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1305 | } | |
1306 | else if (SCM_EQ_P (tmp, scm_sym_unquote)) | |
1307 | { | |
1308 | SCM args = SCM_CDR (form); | |
e90c3a89 | 1309 | SCM_ASSYNT (scm_ilength (args) == 1, s_expression, s_quasiquote); |
9fbee57e DH |
1310 | if (depth - 1 == 0) |
1311 | return scm_eval_car (args, env); | |
1312 | else | |
1313 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1314 | } | |
1315 | else if (SCM_CONSP (tmp) | |
1316 | && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing)) | |
1317 | { | |
1318 | SCM args = SCM_CDR (tmp); | |
e90c3a89 | 1319 | SCM_ASSYNT (scm_ilength (args) == 1, s_expression, s_quasiquote); |
9fbee57e DH |
1320 | if (depth - 1 == 0) |
1321 | { | |
1322 | SCM list = scm_eval_car (args, env); | |
1323 | SCM rest = SCM_CDR (form); | |
1324 | SCM_ASSYNT (scm_ilength (list) >= 0, s_splicing, s_quasiquote); | |
1325 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); | |
1326 | } | |
1327 | else | |
1328 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1329 | iqq (SCM_CDR (form), env, depth)); | |
1330 | } | |
1331 | else | |
1332 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1333 | iqq (SCM_CDR (form), env, depth)); | |
1334 | } | |
1335 | else if (SCM_VECTORP (form)) | |
c96d76b8 | 1336 | { |
9fbee57e DH |
1337 | size_t i = SCM_VECTOR_LENGTH (form); |
1338 | SCM const *const data = SCM_VELTS (form); | |
1339 | SCM tmp = SCM_EOL; | |
1340 | while (i != 0) | |
1341 | tmp = scm_cons (data[--i], tmp); | |
1342 | scm_remember_upto_here_1 (form); | |
1343 | return scm_vector (iqq (tmp, env, depth)); | |
c96d76b8 | 1344 | } |
9fbee57e DH |
1345 | else |
1346 | return form; | |
1347 | } | |
1348 | ||
1349 | SCM | |
1350 | scm_m_quasiquote (SCM xorig, SCM env) | |
1351 | { | |
1352 | SCM x = SCM_CDR (xorig); | |
e90c3a89 | 1353 | SCM_ASSYNT (scm_ilength (x) == 1, s_expression, s_quasiquote); |
9fbee57e DH |
1354 | return iqq (SCM_CAR (x), env, 1); |
1355 | } | |
1356 | ||
1357 | ||
3b88ed2a | 1358 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1359 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1360 | ||
1361 | SCM | |
1362 | scm_m_quote (SCM xorig, SCM env SCM_UNUSED) | |
1363 | { | |
e90c3a89 | 1364 | SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1, s_expression, s_quote); |
9fbee57e DH |
1365 | return scm_cons (SCM_IM_QUOTE, SCM_CDR (xorig)); |
1366 | } | |
1367 | ||
1368 | ||
1369 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1370 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1371 | static const char s_set_x[] = "set!"; |
1372 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1373 | ||
1374 | SCM | |
1375 | scm_m_set_x (SCM xorig, SCM env SCM_UNUSED) | |
1376 | { | |
1377 | SCM x = SCM_CDR (xorig); | |
e90c3a89 DH |
1378 | SCM_ASSYNT (scm_ilength (x) == 2, s_expression, s_set_x); |
1379 | SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (x)), s_variable, s_set_x); | |
9fbee57e DH |
1380 | return scm_cons (SCM_IM_SET_X, x); |
1381 | } | |
1382 | ||
1383 | ||
1384 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1385 | ||
1386 | ||
3b88ed2a | 1387 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1388 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1389 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1390 | ||
1391 | SCM | |
1392 | scm_m_apply (SCM xorig, SCM env SCM_UNUSED) | |
1393 | { | |
e90c3a89 | 1394 | SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2, s_expression, s_atapply); |
9fbee57e | 1395 | return scm_cons (SCM_IM_APPLY, SCM_CDR (xorig)); |
73b64342 MD |
1396 | } |
1397 | ||
c96d76b8 | 1398 | |
2e171178 MV |
1399 | /* (@bind ((var exp) ...) body ...) |
1400 | ||
1401 | This will assign the values of the `exp's to the global variables | |
1402 | named by `var's (symbols, not evaluated), creating them if they | |
1403 | don't exist, executes body, and then restores the previous values of | |
1404 | the `var's. Additionally, whenever control leaves body, the values | |
1405 | of the `var's are saved and restored when control returns. It is an | |
1406 | error when a symbol appears more than once among the `var's. | |
1407 | All `exp's are evaluated before any `var' is set. | |
1408 | ||
c96d76b8 | 1409 | Think of this as `let' for dynamic scope. |
2e171178 MV |
1410 | |
1411 | It is memoized into (#@bind ((var ...) . (reversed-val ...)) body ...). | |
1412 | ||
1413 | XXX - also implement `@bind*'. | |
1414 | */ | |
1415 | ||
3b88ed2a | 1416 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 MD |
1417 | |
1418 | SCM | |
1419 | scm_m_atbind (SCM xorig, SCM env) | |
1420 | { | |
1421 | SCM x = SCM_CDR (xorig); | |
2e171178 | 1422 | SCM top_level = scm_env_top_level (env); |
311f6782 | 1423 | SCM vars = SCM_EOL, var; |
2e171178 MV |
1424 | SCM exps = SCM_EOL; |
1425 | ||
e90c3a89 | 1426 | SCM_ASSYNT (scm_ilength (x) > 1, s_expression, s_atbind); |
73b64342 | 1427 | |
73b64342 MD |
1428 | x = SCM_CAR (x); |
1429 | while (SCM_NIMP (x)) | |
1430 | { | |
2e171178 MV |
1431 | SCM rest; |
1432 | SCM sym_exp = SCM_CAR (x); | |
e90c3a89 DH |
1433 | SCM_ASSYNT (scm_ilength (sym_exp) == 2, s_bindings, s_atbind); |
1434 | SCM_ASSYNT (SCM_SYMBOLP (SCM_CAR (sym_exp)), s_bindings, s_atbind); | |
73b64342 | 1435 | x = SCM_CDR (x); |
2e171178 | 1436 | for (rest = x; SCM_NIMP (rest); rest = SCM_CDR (rest)) |
8ea46249 | 1437 | if (SCM_EQ_P (SCM_CAR (sym_exp), SCM_CAAR (rest))) |
e90c3a89 | 1438 | scm_misc_error (s_atbind, s_duplicate_bindings, SCM_EOL); |
311f6782 MV |
1439 | /* The first call to scm_sym2var will look beyond the current |
1440 | module, while the second call wont. */ | |
1441 | var = scm_sym2var (SCM_CAR (sym_exp), top_level, SCM_BOOL_F); | |
1442 | if (SCM_FALSEP (var)) | |
1443 | var = scm_sym2var (SCM_CAR (sym_exp), top_level, SCM_BOOL_T); | |
1444 | vars = scm_cons (var, vars); | |
2e171178 | 1445 | exps = scm_cons (SCM_CADR (sym_exp), exps); |
73b64342 | 1446 | } |
2e171178 MV |
1447 | return scm_cons (SCM_IM_BIND, |
1448 | scm_cons (scm_cons (scm_reverse_x (vars, SCM_EOL), exps), | |
1449 | SCM_CDDR (xorig))); | |
73b64342 | 1450 | } |
73b64342 | 1451 | |
b0c5d67b | 1452 | |
3b88ed2a | 1453 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
1454 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
1455 | ||
1456 | ||
1457 | SCM | |
1458 | scm_m_cont (SCM xorig, SCM env SCM_UNUSED) | |
b0c5d67b | 1459 | { |
9fbee57e | 1460 | SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1, |
e90c3a89 | 1461 | s_expression, s_atcall_cc); |
9fbee57e | 1462 | return scm_cons (SCM_IM_CONT, SCM_CDR (xorig)); |
b0c5d67b | 1463 | } |
b0c5d67b DH |
1464 | |
1465 | ||
3b88ed2a | 1466 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 1467 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
1468 | |
1469 | SCM | |
9fbee57e | 1470 | scm_m_at_call_with_values (SCM xorig, SCM env SCM_UNUSED) |
b0c5d67b | 1471 | { |
9fbee57e | 1472 | SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2, |
e90c3a89 | 1473 | s_expression, s_at_call_with_values); |
9fbee57e | 1474 | return scm_cons (SCM_IM_CALL_WITH_VALUES, SCM_CDR (xorig)); |
b0c5d67b | 1475 | } |
b0c5d67b DH |
1476 | |
1477 | ||
3b88ed2a | 1478 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 1479 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 1480 | |
9fbee57e DH |
1481 | /* Like promises, futures are implemented as closures with an empty |
1482 | * parameter list. Thus, (future <expression>) is transformed into | |
1483 | * (#@future '() <expression>), where the empty list represents the | |
1484 | * empty parameter list. This representation allows for easy creation | |
1485 | * of the closure during evaluation. */ | |
a513ead3 | 1486 | SCM |
8ae95199 | 1487 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 1488 | { |
8ae95199 DH |
1489 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1490 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
1491 | return new_expr; | |
a513ead3 MV |
1492 | } |
1493 | ||
9fbee57e | 1494 | |
3b88ed2a | 1495 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
1496 | SCM_SYMBOL (scm_sym_setter, "setter"); |
1497 | ||
1498 | SCM | |
1499 | scm_m_generalized_set_x (SCM xorig, SCM env SCM_UNUSED) | |
1500 | { | |
1501 | SCM x = SCM_CDR (xorig); | |
e90c3a89 | 1502 | SCM_ASSYNT (2 == scm_ilength (x), s_expression, s_set_x); |
9fbee57e DH |
1503 | if (SCM_SYMBOLP (SCM_CAR (x))) |
1504 | return scm_cons (SCM_IM_SET_X, x); | |
1505 | else if (SCM_CONSP (SCM_CAR (x))) | |
1506 | return scm_cons (scm_list_2 (scm_sym_setter, SCM_CAAR (x)), | |
1507 | scm_append (scm_list_2 (SCM_CDAR (x), SCM_CDR (x)))); | |
1508 | else | |
e90c3a89 | 1509 | scm_misc_error (s_set_x, s_variable, SCM_EOL); |
9fbee57e DH |
1510 | } |
1511 | ||
1512 | ||
a4aa2134 | 1513 | static const char* s_atslot_ref = "@slot-ref"; |
9fbee57e | 1514 | |
a4aa2134 DH |
1515 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
1516 | * soon as the module system allows us to more freely create bindings in | |
1517 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1518 | * moved here. */ | |
9fbee57e DH |
1519 | SCM |
1520 | scm_m_atslot_ref (SCM xorig, SCM env SCM_UNUSED) | |
1521 | #define FUNC_NAME s_atslot_ref | |
1522 | { | |
1523 | SCM x = SCM_CDR (xorig); | |
e90c3a89 | 1524 | SCM_ASSYNT (scm_ilength (x) == 2, s_expression, FUNC_NAME); |
9fbee57e DH |
1525 | SCM_VALIDATE_INUM (SCM_ARG2, SCM_CADR (x)); |
1526 | return scm_cons (SCM_IM_SLOT_REF, x); | |
1527 | } | |
1528 | #undef FUNC_NAME | |
1529 | ||
1530 | ||
a4aa2134 | 1531 | static const char* s_atslot_set_x = "@slot-set!"; |
9fbee57e | 1532 | |
a4aa2134 DH |
1533 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
1534 | * soon as the module system allows us to more freely create bindings in | |
1535 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1536 | * moved here. */ | |
9fbee57e DH |
1537 | SCM |
1538 | scm_m_atslot_set_x (SCM xorig, SCM env SCM_UNUSED) | |
1539 | #define FUNC_NAME s_atslot_set_x | |
1540 | { | |
1541 | SCM x = SCM_CDR (xorig); | |
e90c3a89 | 1542 | SCM_ASSYNT (scm_ilength (x) == 3, s_expression, FUNC_NAME); |
9fbee57e DH |
1543 | SCM_VALIDATE_INUM (SCM_ARG2, SCM_CADR (x)); |
1544 | return scm_cons (SCM_IM_SLOT_SET_X, x); | |
1545 | } | |
1546 | #undef FUNC_NAME | |
1547 | ||
1548 | ||
1549 | #if SCM_ENABLE_ELISP | |
1550 | ||
3b88ed2a | 1551 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e DH |
1552 | |
1553 | SCM | |
1554 | scm_m_nil_cond (SCM xorig, SCM env SCM_UNUSED) | |
1555 | { | |
1556 | long len = scm_ilength (SCM_CDR (xorig)); | |
e90c3a89 | 1557 | SCM_ASSYNT (len >= 1 && (len & 1) == 1, s_expression, "nil-cond"); |
9fbee57e DH |
1558 | return scm_cons (SCM_IM_NIL_COND, SCM_CDR (xorig)); |
1559 | } | |
1560 | ||
1561 | ||
3b88ed2a | 1562 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e DH |
1563 | |
1564 | SCM | |
1565 | scm_m_atfop (SCM xorig, SCM env SCM_UNUSED) | |
1566 | { | |
1567 | SCM x = SCM_CDR (xorig), var; | |
e90c3a89 | 1568 | SCM_ASSYNT (scm_ilength (x) >= 1, s_expression, "@fop"); |
9fbee57e DH |
1569 | var = scm_symbol_fref (SCM_CAR (x)); |
1570 | /* Passing the symbol name as the `subr' arg here isn't really | |
1571 | right, but without it it can be very difficult to work out from | |
1572 | the error message which function definition was missing. In any | |
1573 | case, we shouldn't really use SCM_ASSYNT here at all, but instead | |
1574 | something equivalent to (signal void-function (list SYM)) in | |
1575 | Elisp. */ | |
1576 | SCM_ASSYNT (SCM_VARIABLEP (var), | |
1577 | "Symbol's function definition is void", | |
1578 | SCM_SYMBOL_CHARS (SCM_CAR (x))); | |
1579 | /* Support `defalias'. */ | |
1580 | while (SCM_SYMBOLP (SCM_VARIABLE_REF (var))) | |
1581 | { | |
1582 | var = scm_symbol_fref (SCM_VARIABLE_REF (var)); | |
1583 | SCM_ASSYNT (SCM_VARIABLEP (var), | |
1584 | "Symbol's function definition is void", | |
1585 | SCM_SYMBOL_CHARS (SCM_CAR (x))); | |
1586 | } | |
1587 | /* Use `var' here rather than `SCM_VARIABLE_REF (var)' because the | |
1588 | former allows for automatically picking up redefinitions of the | |
1589 | corresponding symbol. */ | |
1590 | SCM_SETCAR (x, var); | |
1591 | /* If the variable contains a procedure, leave the | |
1592 | `transformer-macro' in place so that the procedure's arguments | |
1593 | get properly transformed, and change the initial @fop to | |
1594 | SCM_IM_APPLY. */ | |
1595 | if (!SCM_MACROP (SCM_VARIABLE_REF (var))) | |
1596 | { | |
1597 | SCM_SETCAR (xorig, SCM_IM_APPLY); | |
1598 | return xorig; | |
1599 | } | |
1600 | /* Otherwise (the variable contains a macro), the arguments should | |
1601 | not be transformed, so cut the `transformer-macro' out and return | |
1602 | the resulting expression starting with the variable. */ | |
1603 | SCM_SETCDR (x, SCM_CDADR (x)); | |
1604 | return x; | |
1605 | } | |
1606 | ||
1607 | #endif /* SCM_ENABLE_ELISP */ | |
1608 | ||
1609 | ||
f58c472a DH |
1610 | /* Start of the memoizers for deprecated macros. */ |
1611 | ||
1612 | ||
1613 | #if (SCM_ENABLE_DEPRECATED == 1) | |
1614 | ||
1615 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
1616 | ||
1617 | SCM | |
1618 | scm_m_undefine (SCM x, SCM env) | |
1619 | { | |
1620 | SCM arg1 = x; | |
1621 | x = SCM_CDR (x); | |
1622 | SCM_ASSYNT (SCM_TOP_LEVEL (env), "bad placement ", s_undefine); | |
1623 | SCM_ASSYNT (SCM_CONSP (x) && SCM_NULLP (SCM_CDR (x)), | |
e90c3a89 | 1624 | s_expression, s_undefine); |
f58c472a | 1625 | x = SCM_CAR (x); |
e90c3a89 | 1626 | SCM_ASSYNT (SCM_SYMBOLP (x), s_variable, s_undefine); |
f58c472a DH |
1627 | arg1 = scm_sym2var (x, scm_env_top_level (env), SCM_BOOL_F); |
1628 | SCM_ASSYNT (!SCM_FALSEP (arg1) && !SCM_UNBNDP (SCM_VARIABLE_REF (arg1)), | |
1629 | "variable already unbound ", s_undefine); | |
1630 | SCM_VARIABLE_SET (arg1, SCM_UNDEFINED); | |
1631 | #ifdef SICP | |
1632 | return x; | |
1633 | #else | |
1634 | return SCM_UNSPECIFIED; | |
1635 | #endif | |
1636 | } | |
1637 | ||
1638 | #endif | |
1639 | ||
1640 | ||
26d5b9b4 MD |
1641 | SCM |
1642 | scm_m_expand_body (SCM xorig, SCM env) | |
1643 | { | |
22a52da1 | 1644 | SCM x = SCM_CDR (xorig), defs = SCM_EOL; |
26d5b9b4 MD |
1645 | char *what = SCM_ISYMCHARS (SCM_CAR (xorig)) + 2; |
1646 | ||
1647 | while (SCM_NIMP (x)) | |
1648 | { | |
22a52da1 DH |
1649 | SCM form = SCM_CAR (x); |
1650 | if (!SCM_CONSP (form)) | |
26d5b9b4 MD |
1651 | break; |
1652 | if (!SCM_SYMBOLP (SCM_CAR (form))) | |
1653 | break; | |
22a52da1 | 1654 | |
3a3111a8 MD |
1655 | form = scm_macroexp (scm_cons_source (form, |
1656 | SCM_CAR (form), | |
1657 | SCM_CDR (form)), | |
1658 | env); | |
26d5b9b4 | 1659 | |
cf498326 | 1660 | if (SCM_EQ_P (SCM_IM_DEFINE, SCM_CAR (form))) |
26d5b9b4 MD |
1661 | { |
1662 | defs = scm_cons (SCM_CDR (form), defs); | |
22a52da1 | 1663 | x = SCM_CDR (x); |
26d5b9b4 | 1664 | } |
22a52da1 | 1665 | else if (!SCM_IMP (defs)) |
26d5b9b4 MD |
1666 | { |
1667 | break; | |
1668 | } | |
cf498326 | 1669 | else if (SCM_EQ_P (SCM_IM_BEGIN, SCM_CAR (form))) |
26d5b9b4 | 1670 | { |
8ea46249 | 1671 | x = scm_append (scm_list_2 (SCM_CDR (form), SCM_CDR (x))); |
26d5b9b4 MD |
1672 | } |
1673 | else | |
1674 | { | |
22a52da1 | 1675 | x = scm_cons (form, SCM_CDR (x)); |
26d5b9b4 MD |
1676 | break; |
1677 | } | |
1678 | } | |
1679 | ||
302c12b4 | 1680 | if (!SCM_NULLP (defs)) |
26d5b9b4 | 1681 | { |
302c12b4 DH |
1682 | SCM rvars, inits, body, letrec; |
1683 | transform_bindings (defs, &rvars, &inits, what); | |
1684 | body = scm_m_body (SCM_IM_DEFINE, x, what); | |
1685 | letrec = scm_cons2 (SCM_IM_LETREC, rvars, scm_cons (inits, body)); | |
1686 | SCM_SETCAR (xorig, letrec); | |
1687 | SCM_SETCDR (xorig, SCM_EOL); | |
1688 | } | |
1689 | else | |
1690 | { | |
e90c3a89 | 1691 | SCM_ASSYNT (SCM_CONSP (x), s_body, what); |
302c12b4 DH |
1692 | SCM_SETCAR (xorig, SCM_CAR (x)); |
1693 | SCM_SETCDR (xorig, SCM_CDR (x)); | |
26d5b9b4 | 1694 | } |
26d5b9b4 MD |
1695 | |
1696 | return xorig; | |
1697 | } | |
1698 | ||
1699 | SCM | |
1700 | scm_macroexp (SCM x, SCM env) | |
1701 | { | |
86d31dfe | 1702 | SCM res, proc, orig_sym; |
26d5b9b4 MD |
1703 | |
1704 | /* Don't bother to produce error messages here. We get them when we | |
1705 | eventually execute the code for real. */ | |
1706 | ||
1707 | macro_tail: | |
86d31dfe MV |
1708 | orig_sym = SCM_CAR (x); |
1709 | if (!SCM_SYMBOLP (orig_sym)) | |
26d5b9b4 MD |
1710 | return x; |
1711 | ||
26d5b9b4 MD |
1712 | { |
1713 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
1714 | if (proc_ptr == NULL) | |
1715 | { | |
1716 | /* We have lost the race. */ | |
1717 | goto macro_tail; | |
1718 | } | |
1719 | proc = *proc_ptr; | |
1720 | } | |
26d5b9b4 MD |
1721 | |
1722 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
1723 | special forms and should not be evaluated here. */ | |
1724 | ||
3b88ed2a DH |
1725 | if (!SCM_MACROP (proc) |
1726 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
26d5b9b4 MD |
1727 | return x; |
1728 | ||
86d31dfe | 1729 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ |
fdc28395 | 1730 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); |
26d5b9b4 MD |
1731 | |
1732 | if (scm_ilength (res) <= 0) | |
8ea46249 | 1733 | res = scm_list_2 (SCM_IM_BEGIN, res); |
26d5b9b4 | 1734 | |
26d5b9b4 MD |
1735 | SCM_DEFER_INTS; |
1736 | SCM_SETCAR (x, SCM_CAR (res)); | |
1737 | SCM_SETCDR (x, SCM_CDR (res)); | |
1738 | SCM_ALLOW_INTS; | |
1739 | ||
1740 | goto macro_tail; | |
1741 | } | |
73b64342 | 1742 | |
a44a9715 DH |
1743 | #define SCM_BIT7(x) (127 & SCM_UNPACK (x)) |
1744 | ||
1745 | /* A function object to implement "apply" for non-closure functions. */ | |
1746 | static SCM f_apply; | |
1747 | /* An endless list consisting of #<undefined> objects: */ | |
1748 | static SCM undefineds; | |
1749 | ||
6dbd0af5 MD |
1750 | /* scm_unmemocopy takes a memoized expression together with its |
1751 | * environment and rewrites it to its original form. Thus, it is the | |
1752 | * inversion of the rewrite rules above. The procedure is not | |
1753 | * optimized for speed. It's used in scm_iprin1 when printing the | |
220ff1eb MD |
1754 | * code of a closure, in scm_procedure_source, in display_frame when |
1755 | * generating the source for a stackframe in a backtrace, and in | |
1756 | * display_expression. | |
86d31dfe | 1757 | * |
c96d76b8 | 1758 | * Unmemoizing is not a reliable process. You cannot in general |
86d31dfe MV |
1759 | * expect to get the original source back. |
1760 | * | |
1761 | * However, GOOPS currently relies on this for method compilation. | |
1762 | * This ought to change. | |
26d5b9b4 MD |
1763 | */ |
1764 | ||
8ea46249 DH |
1765 | static SCM |
1766 | build_binding_list (SCM names, SCM inits) | |
1767 | { | |
1768 | SCM bindings = SCM_EOL; | |
1769 | while (!SCM_NULLP (names)) | |
1770 | { | |
1771 | SCM binding = scm_list_2 (SCM_CAR (names), SCM_CAR (inits)); | |
1772 | bindings = scm_cons (binding, bindings); | |
1773 | names = SCM_CDR (names); | |
1774 | inits = SCM_CDR (inits); | |
1775 | } | |
1776 | return bindings; | |
1777 | } | |
1778 | ||
6dbd0af5 | 1779 | static SCM |
1bbd0b84 | 1780 | unmemocopy (SCM x, SCM env) |
6dbd0af5 MD |
1781 | { |
1782 | SCM ls, z; | |
6dbd0af5 | 1783 | SCM p; |
8c494e99 | 1784 | if (!SCM_CONSP (x)) |
6dbd0af5 | 1785 | return x; |
6dbd0af5 | 1786 | p = scm_whash_lookup (scm_source_whash, x); |
8ea46249 | 1787 | switch (SCM_ITAG7 (SCM_CAR (x))) |
6dbd0af5 | 1788 | { |
1b43d24c | 1789 | case SCM_BIT7 (SCM_IM_AND): |
2f0d1375 | 1790 | ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED); |
6dbd0af5 | 1791 | break; |
1b43d24c | 1792 | case SCM_BIT7 (SCM_IM_BEGIN): |
2f0d1375 | 1793 | ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED); |
6dbd0af5 | 1794 | break; |
1b43d24c | 1795 | case SCM_BIT7 (SCM_IM_CASE): |
2f0d1375 | 1796 | ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED); |
6dbd0af5 | 1797 | break; |
1b43d24c | 1798 | case SCM_BIT7 (SCM_IM_COND): |
2f0d1375 | 1799 | ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED); |
6dbd0af5 | 1800 | break; |
1b43d24c | 1801 | case SCM_BIT7 (SCM_IM_DO): |
6dbd0af5 | 1802 | { |
e681d187 DH |
1803 | /* format: (#@do (i1 ... ik) (nk nk-1 ...) (test) (body) s1 ... sk), |
1804 | * where ix is an initializer for a local variable, nx is the name of | |
8ea46249 DH |
1805 | * the local variable, test is the test clause of the do loop, body is |
1806 | * the body of the do loop and sx are the step clauses for the local | |
1807 | * variables. */ | |
1808 | SCM names, inits, test, memoized_body, steps, bindings; | |
1809 | ||
6dbd0af5 | 1810 | x = SCM_CDR (x); |
8ea46249 | 1811 | inits = scm_reverse (unmemocopy (SCM_CAR (x), env)); |
e681d187 DH |
1812 | x = SCM_CDR (x); |
1813 | names = SCM_CAR (x); | |
821f18a4 | 1814 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); |
6dbd0af5 | 1815 | x = SCM_CDR (x); |
8ea46249 DH |
1816 | test = unmemocopy (SCM_CAR (x), env); |
1817 | x = SCM_CDR (x); | |
1818 | memoized_body = SCM_CAR (x); | |
1819 | x = SCM_CDR (x); | |
1820 | steps = scm_reverse (unmemocopy (x, env)); | |
1821 | ||
26d5b9b4 | 1822 | /* build transformed binding list */ |
8ea46249 DH |
1823 | bindings = SCM_EOL; |
1824 | while (!SCM_NULLP (names)) | |
6dbd0af5 | 1825 | { |
8ea46249 DH |
1826 | SCM name = SCM_CAR (names); |
1827 | SCM init = SCM_CAR (inits); | |
1828 | SCM step = SCM_CAR (steps); | |
1829 | step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step); | |
1830 | ||
1831 | bindings = scm_cons (scm_cons2 (name, init, step), bindings); | |
1832 | ||
1833 | names = SCM_CDR (names); | |
1834 | inits = SCM_CDR (inits); | |
1835 | steps = SCM_CDR (steps); | |
6dbd0af5 | 1836 | } |
8ea46249 DH |
1837 | z = scm_cons (test, SCM_UNSPECIFIED); |
1838 | ls = scm_cons2 (scm_sym_do, bindings, z); | |
1839 | ||
1840 | x = scm_cons (SCM_BOOL_F, memoized_body); | |
1841 | break; | |
1842 | } | |
1b43d24c | 1843 | case SCM_BIT7 (SCM_IM_IF): |
8ea46249 DH |
1844 | ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED); |
1845 | break; | |
1b43d24c | 1846 | case SCM_BIT7 (SCM_IM_LET): |
8ea46249 DH |
1847 | { |
1848 | /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...), | |
1849 | * where nx is the name of a local variable, ix is an initializer for | |
1850 | * the local variable and by are the body clauses. */ | |
1851 | SCM names, inits, bindings; | |
1852 | ||
1853 | x = SCM_CDR (x); | |
1854 | names = SCM_CAR (x); | |
1855 | x = SCM_CDR (x); | |
1856 | inits = scm_reverse (unmemocopy (SCM_CAR (x), env)); | |
821f18a4 | 1857 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); |
8ea46249 DH |
1858 | |
1859 | bindings = build_binding_list (names, inits); | |
1860 | z = scm_cons (bindings, SCM_UNSPECIFIED); | |
1861 | ls = scm_cons (scm_sym_let, z); | |
1862 | break; | |
1863 | } | |
1b43d24c | 1864 | case SCM_BIT7 (SCM_IM_LETREC): |
8ea46249 DH |
1865 | { |
1866 | /* format: (#@letrec (nk nk-1 ...) (i1 ... ik) b1 ...), | |
1867 | * where nx is the name of a local variable, ix is an initializer for | |
1868 | * the local variable and by are the body clauses. */ | |
1869 | SCM names, inits, bindings; | |
1870 | ||
1871 | x = SCM_CDR (x); | |
1872 | names = SCM_CAR (x); | |
821f18a4 | 1873 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); |
8ea46249 DH |
1874 | x = SCM_CDR (x); |
1875 | inits = scm_reverse (unmemocopy (SCM_CAR (x), env)); | |
1876 | ||
1877 | bindings = build_binding_list (names, inits); | |
1878 | z = scm_cons (bindings, SCM_UNSPECIFIED); | |
1879 | ls = scm_cons (scm_sym_letrec, z); | |
6dbd0af5 MD |
1880 | break; |
1881 | } | |
1b43d24c | 1882 | case SCM_BIT7 (SCM_IM_LETSTAR): |
6dbd0af5 MD |
1883 | { |
1884 | SCM b, y; | |
1885 | x = SCM_CDR (x); | |
1886 | b = SCM_CAR (x); | |
1887 | y = SCM_EOL; | |
1888 | if SCM_IMP (b) | |
1889 | { | |
821f18a4 | 1890 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
6dbd0af5 MD |
1891 | goto letstar; |
1892 | } | |
1893 | y = z = scm_acons (SCM_CAR (b), | |
1894 | unmemocar ( | |
8ea46249 | 1895 | scm_cons (unmemocopy (SCM_CADR (b), env), SCM_EOL), env), |
6dbd0af5 | 1896 | SCM_UNSPECIFIED); |
821f18a4 | 1897 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 1898 | b = SCM_CDDR (b); |
6dbd0af5 MD |
1899 | if (SCM_IMP (b)) |
1900 | { | |
1901 | SCM_SETCDR (y, SCM_EOL); | |
05b15362 DH |
1902 | z = scm_cons (y, SCM_UNSPECIFIED); |
1903 | ls = scm_cons (scm_sym_let, z); | |
6dbd0af5 MD |
1904 | break; |
1905 | } | |
1906 | do | |
1907 | { | |
a23afe53 MD |
1908 | SCM_SETCDR (z, scm_acons (SCM_CAR (b), |
1909 | unmemocar ( | |
8ea46249 | 1910 | scm_list_1 (unmemocopy (SCM_CADR (b), env)), env), |
a23afe53 MD |
1911 | SCM_UNSPECIFIED)); |
1912 | z = SCM_CDR (z); | |
821f18a4 | 1913 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 1914 | b = SCM_CDDR (b); |
6dbd0af5 | 1915 | } |
ff467021 | 1916 | while (SCM_NIMP (b)); |
a23afe53 | 1917 | SCM_SETCDR (z, SCM_EOL); |
6dbd0af5 | 1918 | letstar: |
05b15362 DH |
1919 | z = scm_cons (y, SCM_UNSPECIFIED); |
1920 | ls = scm_cons (scm_sym_letstar, z); | |
6dbd0af5 MD |
1921 | break; |
1922 | } | |
1b43d24c | 1923 | case SCM_BIT7 (SCM_IM_OR): |
2f0d1375 | 1924 | ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED); |
6dbd0af5 | 1925 | break; |
1b43d24c | 1926 | case SCM_BIT7 (SCM_IM_LAMBDA): |
6dbd0af5 | 1927 | x = SCM_CDR (x); |
8ea46249 DH |
1928 | z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED); |
1929 | ls = scm_cons (scm_sym_lambda, z); | |
821f18a4 | 1930 | env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env); |
6dbd0af5 | 1931 | break; |
1b43d24c | 1932 | case SCM_BIT7 (SCM_IM_QUOTE): |
2f0d1375 | 1933 | ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED); |
6dbd0af5 | 1934 | break; |
1b43d24c | 1935 | case SCM_BIT7 (SCM_IM_SET_X): |
89efbff4 | 1936 | ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED); |
6dbd0af5 | 1937 | break; |
1b43d24c | 1938 | case SCM_BIT7 (SCM_MAKISYM (0)): |
6dbd0af5 | 1939 | z = SCM_CAR (x); |
ff467021 | 1940 | switch (SCM_ISYMNUM (z)) |
6dbd0af5 | 1941 | { |
22f2cf2d DH |
1942 | case (SCM_ISYMNUM (SCM_IM_DEFINE)): |
1943 | { | |
1944 | SCM n; | |
1945 | x = SCM_CDR (x); | |
1946 | n = SCM_CAR (x); | |
1947 | z = scm_cons (n, SCM_UNSPECIFIED); | |
1948 | ls = scm_cons (scm_sym_define, z); | |
1949 | if (!SCM_NULLP (env)) | |
1950 | env = scm_cons (scm_cons (scm_cons (n, SCM_CAAR (env)), | |
1951 | SCM_CDAR (env)), | |
1952 | SCM_CDR (env)); | |
1953 | break; | |
1954 | } | |
6dbd0af5 | 1955 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
2f0d1375 | 1956 | ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED); |
6dbd0af5 MD |
1957 | goto loop; |
1958 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
2f0d1375 | 1959 | ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED); |
6dbd0af5 | 1960 | goto loop; |
a570e93a MD |
1961 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
1962 | ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED); | |
1963 | x = SCM_CDR (x); | |
1964 | goto loop; | |
28d52ebb | 1965 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
ebf9b47c | 1966 | ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED); |
28d52ebb MD |
1967 | x = SCM_CDR (x); |
1968 | goto loop; | |
a513ead3 MV |
1969 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
1970 | ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED); | |
1971 | goto loop; | |
2a6f7afe DH |
1972 | case (SCM_ISYMNUM (SCM_IM_ELSE)): |
1973 | ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED); | |
1974 | goto loop; | |
6dbd0af5 | 1975 | default: |
fa888178 | 1976 | /* appease the Sun compiler god: */ ; |
6dbd0af5 | 1977 | } |
6dbd0af5 MD |
1978 | default: |
1979 | ls = z = unmemocar (scm_cons (unmemocopy (SCM_CAR (x), env), | |
1980 | SCM_UNSPECIFIED), | |
1981 | env); | |
1982 | } | |
1983 | loop: | |
8c494e99 DH |
1984 | x = SCM_CDR (x); |
1985 | while (SCM_CONSP (x)) | |
a23afe53 | 1986 | { |
8c494e99 DH |
1987 | SCM form = SCM_CAR (x); |
1988 | if (!SCM_ISYMP (form)) | |
1989 | { | |
1990 | SCM copy = scm_cons (unmemocopy (form, env), SCM_UNSPECIFIED); | |
1991 | SCM_SETCDR (z, unmemocar (copy, env)); | |
1992 | z = SCM_CDR (z); | |
1993 | } | |
609a8b86 DH |
1994 | else if (SCM_EQ_P (form, SCM_IM_ARROW)) |
1995 | { | |
1996 | SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED)); | |
1997 | z = SCM_CDR (z); | |
1998 | } | |
8c494e99 | 1999 | x = SCM_CDR (x); |
a23afe53 MD |
2000 | } |
2001 | SCM_SETCDR (z, x); | |
01f11e02 | 2002 | if (!SCM_FALSEP (p)) |
6dbd0af5 | 2003 | scm_whash_insert (scm_source_whash, ls, p); |
6dbd0af5 MD |
2004 | return ls; |
2005 | } | |
2006 | ||
1cc91f1b | 2007 | |
6dbd0af5 | 2008 | SCM |
6e8d25a6 | 2009 | scm_unmemocopy (SCM x, SCM env) |
6dbd0af5 | 2010 | { |
01f11e02 | 2011 | if (!SCM_NULLP (env)) |
6dbd0af5 MD |
2012 | /* Make a copy of the lowest frame to protect it from |
2013 | modifications by SCM_IM_DEFINE */ | |
2014 | return unmemocopy (x, scm_cons (SCM_CAR (env), SCM_CDR (env))); | |
2015 | else | |
2016 | return unmemocopy (x, env); | |
2017 | } | |
2018 | ||
1cc91f1b | 2019 | |
0f2d19dd | 2020 | int |
6e8d25a6 | 2021 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2022 | { |
6a0f6ff3 | 2023 | while (!SCM_NULLP (formals)) |
0f2d19dd | 2024 | { |
01f11e02 | 2025 | if (!SCM_CONSP (formals)) |
ff467021 | 2026 | return 0; |
6a0f6ff3 | 2027 | if (SCM_NULLP (args)) |
ff467021 | 2028 | return 1; |
0f2d19dd JB |
2029 | formals = SCM_CDR (formals); |
2030 | args = SCM_CDR (args); | |
2031 | } | |
01f11e02 | 2032 | return !SCM_NULLP (args) ? 1 : 0; |
0f2d19dd | 2033 | } |
a392ee15 | 2034 | |
0f2d19dd | 2035 | \f |
6dbd0af5 | 2036 | SCM |
6e8d25a6 | 2037 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2038 | { |
680ed4a8 | 2039 | SCM results = SCM_EOL, *lloc = &results, res; |
904a077d | 2040 | while (SCM_CONSP (l)) |
6dbd0af5 | 2041 | { |
680ed4a8 | 2042 | res = EVALCAR (l, env); |
904a077d | 2043 | |
8ea46249 | 2044 | *lloc = scm_list_1 (res); |
a23afe53 | 2045 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2046 | l = SCM_CDR (l); |
2047 | } | |
22a52da1 | 2048 | if (!SCM_NULLP (l)) |
904a077d | 2049 | scm_wrong_num_args (proc); |
680ed4a8 | 2050 | return results; |
6dbd0af5 | 2051 | } |
c4ac4d88 | 2052 | |
d0b07b5d | 2053 | |
9de33deb MD |
2054 | SCM |
2055 | scm_eval_body (SCM code, SCM env) | |
2056 | { | |
2057 | SCM next; | |
2058 | again: | |
01f11e02 DH |
2059 | next = SCM_CDR (code); |
2060 | while (!SCM_NULLP (next)) | |
9de33deb MD |
2061 | { |
2062 | if (SCM_IMP (SCM_CAR (code))) | |
2063 | { | |
2064 | if (SCM_ISYMP (SCM_CAR (code))) | |
2065 | { | |
28d52ebb | 2066 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2067 | /* check for race condition */ |
2068 | if (SCM_ISYMP (SCM_CAR (code))) | |
2069 | code = scm_m_expand_body (code, env); | |
28d52ebb | 2070 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2071 | goto again; |
2072 | } | |
2073 | } | |
2074 | else | |
2075 | SCM_XEVAL (SCM_CAR (code), env); | |
2076 | code = next; | |
01f11e02 | 2077 | next = SCM_CDR (code); |
9de33deb MD |
2078 | } |
2079 | return SCM_XEVALCAR (code, env); | |
2080 | } | |
2081 | ||
0f2d19dd JB |
2082 | #endif /* !DEVAL */ |
2083 | ||
6dbd0af5 MD |
2084 | |
2085 | /* SECTION: This code is specific for the debugging support. One | |
2086 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2087 | * defined. | |
2088 | */ | |
2089 | ||
2090 | #ifndef DEVAL | |
2091 | ||
2092 | #define SCM_APPLY scm_apply | |
2093 | #define PREP_APPLY(proc, args) | |
2094 | #define ENTER_APPLY | |
ddea3325 | 2095 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2096 | #ifdef STACK_CHECKING |
2097 | #ifndef NO_CEVAL_STACK_CHECKING | |
2098 | #define EVAL_STACK_CHECKING | |
2099 | #endif | |
6dbd0af5 MD |
2100 | #endif |
2101 | ||
2102 | #else /* !DEVAL */ | |
2103 | ||
0f2d19dd JB |
2104 | #undef SCM_CEVAL |
2105 | #define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */ | |
2106 | #undef SCM_APPLY | |
2107 | #define SCM_APPLY scm_dapply | |
6dbd0af5 MD |
2108 | #undef PREP_APPLY |
2109 | #define PREP_APPLY(p, l) \ | |
2110 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
2111 | #undef ENTER_APPLY | |
2112 | #define ENTER_APPLY \ | |
d3a6bc94 | 2113 | do { \ |
b7ff98dd | 2114 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2115 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2116 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2117 | {\ |
156dcb09 | 2118 | SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2119 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2120 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2121 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2122 | {\ |
c0ab1b8d | 2123 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 2124 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 2125 | }\ |
6dbd0af5 MD |
2126 | else\ |
2127 | {\ | |
5f144b10 GH |
2128 | int first;\ |
2129 | tmp = scm_make_continuation (&first);\ | |
2130 | if (first)\ | |
d95c0b76 | 2131 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 2132 | }\ |
d95c0b76 | 2133 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 2134 | }\ |
d3a6bc94 | 2135 | } while (0) |
0f2d19dd | 2136 | #undef RETURN |
ddea3325 | 2137 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
b7ff98dd MD |
2138 | #ifdef STACK_CHECKING |
2139 | #ifndef EVAL_STACK_CHECKING | |
2140 | #define EVAL_STACK_CHECKING | |
2141 | #endif | |
6dbd0af5 MD |
2142 | #endif |
2143 | ||
2144 | /* scm_ceval_ptr points to the currently selected evaluator. | |
2145 | * *fixme*: Although efficiency is important here, this state variable | |
2146 | * should probably not be a global. It should be related to the | |
2147 | * current repl. | |
2148 | */ | |
2149 | ||
1cc91f1b | 2150 | |
1bbd0b84 | 2151 | SCM (*scm_ceval_ptr) (SCM x, SCM env); |
0f2d19dd | 2152 | |
1646d37b | 2153 | /* scm_last_debug_frame contains a pointer to the last debugging |
6dbd0af5 MD |
2154 | * information stack frame. It is accessed very often from the |
2155 | * debugging evaluator, so it should probably not be indirectly | |
2156 | * addressed. Better to save and restore it from the current root at | |
2157 | * any stack swaps. | |
2158 | */ | |
2159 | ||
6dbd0af5 MD |
2160 | /* scm_debug_eframe_size is the number of slots available for pseudo |
2161 | * stack frames at each real stack frame. | |
2162 | */ | |
2163 | ||
c014a02e | 2164 | long scm_debug_eframe_size; |
6dbd0af5 | 2165 | |
b7ff98dd | 2166 | int scm_debug_mode, scm_check_entry_p, scm_check_apply_p, scm_check_exit_p; |
6dbd0af5 | 2167 | |
c014a02e | 2168 | long scm_eval_stack; |
a74145b8 | 2169 | |
92c2555f | 2170 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 2171 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
2172 | }; |
2173 | ||
92c2555f | 2174 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
2175 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
2176 | "*Flyweight representation of the stack at traps." }, | |
2177 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
2178 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
2179 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
2180 | "Record procedure names at definition." }, | |
2181 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
2182 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 2183 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
2184 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
2185 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 2186 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
2187 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
2188 | "Maximal number of stored backtrace frames." }, | |
2189 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
2190 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
2191 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 2192 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 2193 | { 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."} |
6dbd0af5 MD |
2194 | }; |
2195 | ||
92c2555f | 2196 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 2197 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
2198 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
2199 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
2200 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
2201 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
2202 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
2203 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
2204 | }; |
2205 | ||
a1ec6916 | 2206 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 2207 | (SCM setting), |
b3f26b14 MG |
2208 | "Option interface for the evaluation options. Instead of using\n" |
2209 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 2210 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 2211 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
2212 | { |
2213 | SCM ans; | |
2214 | SCM_DEFER_INTS; | |
2215 | ans = scm_options (setting, | |
2216 | scm_eval_opts, | |
2217 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 2218 | FUNC_NAME); |
a74145b8 | 2219 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
2220 | SCM_ALLOW_INTS; |
2221 | return ans; | |
2222 | } | |
1bbd0b84 | 2223 | #undef FUNC_NAME |
33b97402 | 2224 | |
d0b07b5d | 2225 | |
a1ec6916 | 2226 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 2227 | (SCM setting), |
b3f26b14 | 2228 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 2229 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
2230 | { |
2231 | SCM ans; | |
2232 | SCM_DEFER_INTS; | |
2233 | ans = scm_options (setting, | |
2234 | scm_evaluator_trap_table, | |
2235 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 2236 | FUNC_NAME); |
33b97402 | 2237 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 2238 | SCM_ALLOW_INTS; |
33b97402 MD |
2239 | return ans; |
2240 | } | |
1bbd0b84 | 2241 | #undef FUNC_NAME |
33b97402 | 2242 | |
d0b07b5d | 2243 | |
24933780 | 2244 | static SCM |
a392ee15 | 2245 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 2246 | { |
680ed4a8 | 2247 | SCM *results = lloc, res; |
904a077d | 2248 | while (SCM_CONSP (l)) |
0f2d19dd | 2249 | { |
680ed4a8 | 2250 | res = EVALCAR (l, env); |
904a077d | 2251 | |
8ea46249 | 2252 | *lloc = scm_list_1 (res); |
a23afe53 | 2253 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
2254 | l = SCM_CDR (l); |
2255 | } | |
22a52da1 | 2256 | if (!SCM_NULLP (l)) |
904a077d | 2257 | scm_wrong_num_args (proc); |
680ed4a8 | 2258 | return *results; |
0f2d19dd JB |
2259 | } |
2260 | ||
6dbd0af5 MD |
2261 | #endif /* !DEVAL */ |
2262 | ||
2263 | ||
a392ee15 | 2264 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
2265 | */ |
2266 | ||
a392ee15 | 2267 | |
d9d39d76 | 2268 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 2269 | * current module. */ |
d9d39d76 MV |
2270 | #define UPDATE_TOPLEVEL_ENV(env) \ |
2271 | do { \ | |
2272 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 2273 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
2274 | env = scm_top_level_env (p); \ |
2275 | } while (0) | |
2276 | ||
6dbd0af5 | 2277 | |
a392ee15 DH |
2278 | /* This is the evaluator. Like any real monster, it has three heads: |
2279 | * | |
2280 | * scm_ceval is the non-debugging evaluator, scm_deval is the debugging | |
2281 | * version. Both are implemented using a common code base, using the | |
2282 | * following mechanism: SCM_CEVAL is a macro, which is either defined to | |
2283 | * scm_ceval or scm_deval. Thus, there is no function SCM_CEVAL, but the code | |
2284 | * for SCM_CEVAL actually compiles to either scm_ceval or scm_deval. When | |
2285 | * SCM_CEVAL is defined to scm_ceval, it is known that the macro DEVAL is not | |
2286 | * defined. When SCM_CEVAL is defined to scm_deval, then the macro DEVAL is | |
2287 | * known to be defined. Thus, in SCM_CEVAL parts for the debugging evaluator | |
2288 | * are enclosed within #ifdef DEVAL ... #endif. | |
2289 | * | |
2290 | * All three (scm_ceval, scm_deval and their common implementation SCM_CEVAL) | |
2291 | * take two input parameters, x and env: x is a single expression to be | |
2292 | * evalutated. env is the environment in which bindings are searched. | |
2293 | * | |
2294 | * x is known to be a cell (i. e. a pair or any other non-immediate). Since x | |
2295 | * is a single expression, it is necessarily in a tail position. If x is just | |
2296 | * a call to another function like in the expression (foo exp1 exp2 ...), the | |
2297 | * realization of that call therefore _must_not_ increase stack usage (the | |
2298 | * evaluation of exp1, exp2 etc., however, may do so). This is realized by | |
2299 | * making extensive use of 'goto' statements within the evaluator: The gotos | |
2300 | * replace recursive calls to SCM_CEVAL, thus re-using the same stack frame | |
2301 | * that SCM_CEVAL was already using. If, however, x represents some form that | |
2302 | * requires to evaluate a sequence of expressions like (begin exp1 exp2 ...), | |
2303 | * then recursive calls to SCM_CEVAL are performed for all but the last | |
2304 | * expression of that sequence. */ | |
6dbd0af5 | 2305 | |
0f2d19dd | 2306 | #if 0 |
0f2d19dd | 2307 | SCM |
1bbd0b84 | 2308 | scm_ceval (SCM x, SCM env) |
0f2d19dd JB |
2309 | {} |
2310 | #endif | |
1cc91f1b | 2311 | |
a392ee15 | 2312 | #if 0 |
0f2d19dd | 2313 | SCM |
1bbd0b84 | 2314 | scm_deval (SCM x, SCM env) |
0f2d19dd JB |
2315 | {} |
2316 | #endif | |
2317 | ||
6dbd0af5 | 2318 | SCM |
1bbd0b84 | 2319 | SCM_CEVAL (SCM x, SCM env) |
0f2d19dd | 2320 | { |
42030fb2 | 2321 | SCM proc, arg1; |
6dbd0af5 | 2322 | #ifdef DEVAL |
92c2555f MV |
2323 | scm_t_debug_frame debug; |
2324 | scm_t_debug_info *debug_info_end; | |
1646d37b | 2325 | debug.prev = scm_last_debug_frame; |
020c890c | 2326 | debug.status = 0; |
04b6c081 | 2327 | /* |
92c2555f | 2328 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
2329 | * user has specified with (debug-set! frames <n>). |
2330 | * | |
2331 | * Even frames are eval frames, odd frames are apply frames. | |
2332 | */ | |
92c2555f | 2333 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 2334 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
2335 | debug.info = debug.vect; |
2336 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
2337 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 2338 | #endif |
b7ff98dd | 2339 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 2340 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 2341 | { |
b7ff98dd | 2342 | #ifdef DEVAL |
6dbd0af5 MD |
2343 | debug.info->e.exp = x; |
2344 | debug.info->e.env = env; | |
b7ff98dd | 2345 | #endif |
6dbd0af5 MD |
2346 | scm_report_stack_overflow (); |
2347 | } | |
2348 | #endif | |
6a0f6ff3 | 2349 | |
6dbd0af5 MD |
2350 | #ifdef DEVAL |
2351 | goto start; | |
2352 | #endif | |
6a0f6ff3 | 2353 | |
6dbd0af5 MD |
2354 | loop: |
2355 | #ifdef DEVAL | |
b7ff98dd MD |
2356 | SCM_CLEAR_ARGSREADY (debug); |
2357 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 2358 | --debug.info; |
04b6c081 MD |
2359 | /* |
2360 | * In theory, this should be the only place where it is necessary to | |
2361 | * check for space in debug.vect since both eval frames and | |
2362 | * available space are even. | |
2363 | * | |
2364 | * For this to be the case, however, it is necessary that primitive | |
2365 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 2366 | * label call PREP_APPLY. |
04b6c081 | 2367 | */ |
c0ab1b8d | 2368 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 2369 | { |
b7ff98dd | 2370 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
2371 | debug.info -= 2; |
2372 | } | |
6a0f6ff3 | 2373 | |
6dbd0af5 MD |
2374 | start: |
2375 | debug.info->e.exp = x; | |
2376 | debug.info->e.env = env; | |
5132eef0 DH |
2377 | if (scm_check_entry_p && SCM_TRAPS_P) |
2378 | { | |
bc76d628 DH |
2379 | if (SCM_ENTER_FRAME_P |
2380 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 2381 | { |
bc76d628 DH |
2382 | SCM stackrep; |
2383 | SCM tail = SCM_BOOL (SCM_TAILRECP (debug)); | |
5132eef0 DH |
2384 | SCM_SET_TAILREC (debug); |
2385 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 2386 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
2387 | else |
2388 | { | |
2389 | int first; | |
2390 | SCM val = scm_make_continuation (&first); | |
2391 | ||
2392 | if (first) | |
bc76d628 | 2393 | stackrep = val; |
5132eef0 DH |
2394 | else |
2395 | { | |
2396 | x = val; | |
2397 | if (SCM_IMP (x)) | |
2398 | RETURN (x); | |
2399 | else | |
2400 | /* This gives the possibility for the debugger to | |
2401 | modify the source expression before evaluation. */ | |
2402 | goto dispatch; | |
2403 | } | |
2404 | } | |
2405 | SCM_TRAPS_P = 0; | |
2406 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
2407 | scm_sym_enter_frame, | |
bc76d628 | 2408 | stackrep, |
5132eef0 DH |
2409 | tail, |
2410 | scm_unmemocopy (x, env)); | |
2411 | SCM_TRAPS_P = 1; | |
2412 | } | |
2413 | } | |
6dbd0af5 | 2414 | #endif |
f8769b1d | 2415 | dispatch: |
9cb5124f | 2416 | SCM_TICK; |
0f2d19dd JB |
2417 | switch (SCM_TYP7 (x)) |
2418 | { | |
28b06554 | 2419 | case scm_tc7_symbol: |
a392ee15 | 2420 | /* Only happens when called at top level. */ |
0f2d19dd | 2421 | x = scm_cons (x, SCM_UNDEFINED); |
ddea3325 | 2422 | RETURN (*scm_lookupcar (x, env, 1)); |
0f2d19dd | 2423 | |
1b43d24c | 2424 | case SCM_BIT7 (SCM_IM_AND): |
0f2d19dd | 2425 | x = SCM_CDR (x); |
302c12b4 DH |
2426 | while (!SCM_NULLP (SCM_CDR (x))) |
2427 | { | |
38ace99e DH |
2428 | SCM test_result = EVALCAR (x, env); |
2429 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
0f2d19dd | 2430 | RETURN (SCM_BOOL_F); |
302c12b4 DH |
2431 | else |
2432 | x = SCM_CDR (x); | |
2433 | } | |
6dbd0af5 | 2434 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2435 | goto carloop; |
2436 | ||
1b43d24c | 2437 | case SCM_BIT7 (SCM_IM_BEGIN): |
e050d4f8 DH |
2438 | x = SCM_CDR (x); |
2439 | if (SCM_NULLP (x)) | |
b8113bc8 MV |
2440 | RETURN (SCM_UNSPECIFIED); |
2441 | ||
6dbd0af5 | 2442 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2443 | |
2444 | begin: | |
4163eb72 MV |
2445 | /* If we are on toplevel with a lookup closure, we need to sync |
2446 | with the current module. */ | |
22a52da1 | 2447 | if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env))) |
4163eb72 | 2448 | { |
d9d39d76 | 2449 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2450 | while (!SCM_NULLP (SCM_CDR (x))) |
4163eb72 | 2451 | { |
5280aaca | 2452 | EVALCAR (x, env); |
d9d39d76 | 2453 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2454 | x = SCM_CDR (x); |
4163eb72 | 2455 | } |
5280aaca | 2456 | goto carloop; |
4163eb72 MV |
2457 | } |
2458 | else | |
5280aaca MV |
2459 | goto nontoplevel_begin; |
2460 | ||
5280aaca | 2461 | nontoplevel_begin: |
302c12b4 | 2462 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 2463 | { |
6a0f6ff3 DH |
2464 | SCM form = SCM_CAR (x); |
2465 | if (SCM_IMP (form)) | |
26d5b9b4 | 2466 | { |
6a0f6ff3 | 2467 | if (SCM_ISYMP (form)) |
26d5b9b4 | 2468 | { |
28d52ebb | 2469 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2470 | /* check for race condition */ |
2471 | if (SCM_ISYMP (SCM_CAR (x))) | |
2472 | x = scm_m_expand_body (x, env); | |
28d52ebb | 2473 | scm_rec_mutex_unlock (&source_mutex); |
5280aaca | 2474 | goto nontoplevel_begin; |
26d5b9b4 | 2475 | } |
4163eb72 | 2476 | else |
6a0f6ff3 | 2477 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); |
26d5b9b4 | 2478 | } |
5280aaca | 2479 | else |
6a0f6ff3 | 2480 | SCM_CEVAL (form, env); |
302c12b4 | 2481 | x = SCM_CDR (x); |
0f2d19dd | 2482 | } |
5280aaca | 2483 | |
6a0f6ff3 DH |
2484 | carloop: |
2485 | { | |
2486 | /* scm_eval last form in list */ | |
2487 | SCM last_form = SCM_CAR (x); | |
0f2d19dd | 2488 | |
6a0f6ff3 DH |
2489 | if (SCM_CONSP (last_form)) |
2490 | { | |
2491 | /* This is by far the most frequent case. */ | |
2492 | x = last_form; | |
2493 | goto loop; /* tail recurse */ | |
2494 | } | |
2495 | else if (SCM_IMP (last_form)) | |
2496 | RETURN (SCM_EVALIM (last_form, env)); | |
2497 | else if (SCM_VARIABLEP (last_form)) | |
2498 | RETURN (SCM_VARIABLE_REF (last_form)); | |
2499 | else if (SCM_SYMBOLP (last_form)) | |
2500 | RETURN (*scm_lookupcar (x, env, 1)); | |
2501 | else | |
2502 | RETURN (last_form); | |
2503 | } | |
0f2d19dd JB |
2504 | |
2505 | ||
1b43d24c | 2506 | case SCM_BIT7 (SCM_IM_CASE): |
0f2d19dd | 2507 | x = SCM_CDR (x); |
6a0f6ff3 DH |
2508 | { |
2509 | SCM key = EVALCAR (x, env); | |
2510 | x = SCM_CDR (x); | |
2511 | while (!SCM_NULLP (x)) | |
2512 | { | |
2513 | SCM clause = SCM_CAR (x); | |
2514 | SCM labels = SCM_CAR (clause); | |
2a6f7afe | 2515 | if (SCM_EQ_P (labels, SCM_IM_ELSE)) |
6a0f6ff3 DH |
2516 | { |
2517 | x = SCM_CDR (clause); | |
2518 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2519 | goto begin; | |
2520 | } | |
2521 | while (!SCM_NULLP (labels)) | |
2522 | { | |
2523 | SCM label = SCM_CAR (labels); | |
2524 | if (SCM_EQ_P (label, key) || !SCM_FALSEP (scm_eqv_p (label, key))) | |
2525 | { | |
2526 | x = SCM_CDR (clause); | |
2527 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2528 | goto begin; | |
2529 | } | |
2530 | labels = SCM_CDR (labels); | |
2531 | } | |
2532 | x = SCM_CDR (x); | |
2533 | } | |
2534 | } | |
ddea3325 | 2535 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
2536 | |
2537 | ||
1b43d24c | 2538 | case SCM_BIT7 (SCM_IM_COND): |
8ea46249 DH |
2539 | x = SCM_CDR (x); |
2540 | while (!SCM_NULLP (x)) | |
0f2d19dd | 2541 | { |
e5cb71a0 | 2542 | SCM clause = SCM_CAR (x); |
609a8b86 | 2543 | if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE)) |
8ea46249 | 2544 | { |
e5cb71a0 | 2545 | x = SCM_CDR (clause); |
8ea46249 DH |
2546 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
2547 | goto begin; | |
2548 | } | |
e5cb71a0 | 2549 | else |
0f2d19dd | 2550 | { |
dff98306 DH |
2551 | arg1 = EVALCAR (clause, env); |
2552 | if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1)) | |
6dbd0af5 | 2553 | { |
e5cb71a0 DH |
2554 | x = SCM_CDR (clause); |
2555 | if (SCM_NULLP (x)) | |
dff98306 | 2556 | RETURN (arg1); |
609a8b86 | 2557 | else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW)) |
e5cb71a0 DH |
2558 | { |
2559 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2560 | goto begin; | |
2561 | } | |
2562 | else | |
2563 | { | |
2564 | proc = SCM_CDR (x); | |
2565 | proc = EVALCAR (proc, env); | |
dff98306 | 2566 | PREP_APPLY (proc, scm_list_1 (arg1)); |
e5cb71a0 | 2567 | ENTER_APPLY; |
ddd8f927 | 2568 | goto evap1; |
e5cb71a0 | 2569 | } |
6dbd0af5 | 2570 | } |
e5cb71a0 | 2571 | x = SCM_CDR (x); |
0f2d19dd JB |
2572 | } |
2573 | } | |
ddea3325 | 2574 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
2575 | |
2576 | ||
1b43d24c | 2577 | case SCM_BIT7 (SCM_IM_DO): |
0f2d19dd | 2578 | x = SCM_CDR (x); |
e5cb71a0 DH |
2579 | { |
2580 | /* Compute the initialization values and the initial environment. */ | |
e681d187 | 2581 | SCM init_forms = SCM_CAR (x); |
e5cb71a0 DH |
2582 | SCM init_values = SCM_EOL; |
2583 | while (!SCM_NULLP (init_forms)) | |
2584 | { | |
2585 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
2586 | init_forms = SCM_CDR (init_forms); | |
2587 | } | |
e681d187 | 2588 | x = SCM_CDR (x); |
821f18a4 | 2589 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
e5cb71a0 | 2590 | } |
e681d187 | 2591 | x = SCM_CDR (x); |
e5cb71a0 DH |
2592 | { |
2593 | SCM test_form = SCM_CAR (x); | |
2594 | SCM body_forms = SCM_CADR (x); | |
2595 | SCM step_forms = SCM_CDDR (x); | |
2596 | ||
2597 | SCM test_result = EVALCAR (test_form, env); | |
2598 | ||
2599 | while (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
2600 | { | |
0f2d19dd | 2601 | { |
e5cb71a0 DH |
2602 | /* Evaluate body forms. */ |
2603 | SCM temp_forms; | |
2604 | for (temp_forms = body_forms; | |
2605 | !SCM_NULLP (temp_forms); | |
2606 | temp_forms = SCM_CDR (temp_forms)) | |
2607 | { | |
2608 | SCM form = SCM_CAR (temp_forms); | |
2609 | /* Dirk:FIXME: We only need to eval forms, that may have a | |
2610 | * side effect here. This is only true for forms that start | |
2611 | * with a pair. All others are just constants. However, | |
2612 | * since in the common case there is no constant expression | |
2613 | * in a body of a do form, we just check for immediates here | |
2614 | * and have SCM_CEVAL take care of other cases. In the long | |
2615 | * run it would make sense to get rid of this test and have | |
2616 | * the macro transformer of 'do' eliminate all forms that | |
2617 | * have no sideeffect. */ | |
2618 | if (!SCM_IMP (form)) | |
2619 | SCM_CEVAL (form, env); | |
2620 | } | |
0f2d19dd | 2621 | } |
e5cb71a0 DH |
2622 | |
2623 | { | |
2624 | /* Evaluate the step expressions. */ | |
2625 | SCM temp_forms; | |
2626 | SCM step_values = SCM_EOL; | |
2627 | for (temp_forms = step_forms; | |
2628 | !SCM_NULLP (temp_forms); | |
2629 | temp_forms = SCM_CDR (temp_forms)) | |
2630 | { | |
2631 | SCM value = EVALCAR (temp_forms, env); | |
2632 | step_values = scm_cons (value, step_values); | |
2633 | } | |
821f18a4 DH |
2634 | env = SCM_EXTEND_ENV (SCM_CAAR (env), |
2635 | step_values, | |
2636 | SCM_CDR (env)); | |
e5cb71a0 DH |
2637 | } |
2638 | ||
2639 | test_result = EVALCAR (test_form, env); | |
2640 | } | |
2641 | } | |
2642 | x = SCM_CDAR (x); | |
0f2d19dd | 2643 | if (SCM_NULLP (x)) |
6dbd0af5 MD |
2644 | RETURN (SCM_UNSPECIFIED); |
2645 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
5280aaca | 2646 | goto nontoplevel_begin; |
0f2d19dd JB |
2647 | |
2648 | ||
1b43d24c | 2649 | case SCM_BIT7 (SCM_IM_IF): |
0f2d19dd | 2650 | x = SCM_CDR (x); |
38ace99e DH |
2651 | { |
2652 | SCM test_result = EVALCAR (x, env); | |
2653 | if (!SCM_FALSEP (test_result) && !SCM_NILP (test_result)) | |
2654 | x = SCM_CDR (x); | |
2655 | else | |
2656 | { | |
2657 | x = SCM_CDDR (x); | |
2658 | if (SCM_NULLP (x)) | |
2659 | RETURN (SCM_UNSPECIFIED); | |
2660 | } | |
2661 | } | |
6dbd0af5 | 2662 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2663 | goto carloop; |
2664 | ||
2665 | ||
1b43d24c | 2666 | case SCM_BIT7 (SCM_IM_LET): |
0f2d19dd | 2667 | x = SCM_CDR (x); |
38ace99e DH |
2668 | { |
2669 | SCM init_forms = SCM_CADR (x); | |
2670 | SCM init_values = SCM_EOL; | |
2671 | do | |
2672 | { | |
2673 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
2674 | init_forms = SCM_CDR (init_forms); | |
2675 | } | |
2676 | while (!SCM_NULLP (init_forms)); | |
821f18a4 | 2677 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
38ace99e | 2678 | } |
e050d4f8 DH |
2679 | x = SCM_CDDR (x); |
2680 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2681 | goto nontoplevel_begin; | |
0f2d19dd JB |
2682 | |
2683 | ||
1b43d24c | 2684 | case SCM_BIT7 (SCM_IM_LETREC): |
0f2d19dd | 2685 | x = SCM_CDR (x); |
821f18a4 | 2686 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); |
0f2d19dd | 2687 | x = SCM_CDR (x); |
38ace99e DH |
2688 | { |
2689 | SCM init_forms = SCM_CAR (x); | |
2690 | SCM init_values = SCM_EOL; | |
2691 | do | |
2692 | { | |
2693 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
2694 | init_forms = SCM_CDR (init_forms); | |
2695 | } | |
2696 | while (!SCM_NULLP (init_forms)); | |
2697 | SCM_SETCDR (SCM_CAR (env), init_values); | |
2698 | } | |
e050d4f8 DH |
2699 | x = SCM_CDR (x); |
2700 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2701 | goto nontoplevel_begin; | |
0f2d19dd JB |
2702 | |
2703 | ||
1b43d24c | 2704 | case SCM_BIT7 (SCM_IM_LETSTAR): |
0f2d19dd | 2705 | x = SCM_CDR (x); |
302c12b4 DH |
2706 | { |
2707 | SCM bindings = SCM_CAR (x); | |
2708 | if (SCM_NULLP (bindings)) | |
821f18a4 | 2709 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
302c12b4 DH |
2710 | else |
2711 | { | |
2712 | do | |
2713 | { | |
2714 | SCM name = SCM_CAR (bindings); | |
2715 | SCM init = SCM_CDR (bindings); | |
821f18a4 | 2716 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); |
302c12b4 DH |
2717 | bindings = SCM_CDR (init); |
2718 | } | |
2719 | while (!SCM_NULLP (bindings)); | |
2720 | } | |
2721 | } | |
e050d4f8 DH |
2722 | x = SCM_CDR (x); |
2723 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2724 | goto nontoplevel_begin; | |
0f2d19dd | 2725 | |
302c12b4 | 2726 | |
1b43d24c | 2727 | case SCM_BIT7 (SCM_IM_OR): |
0f2d19dd | 2728 | x = SCM_CDR (x); |
302c12b4 | 2729 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 2730 | { |
302c12b4 | 2731 | SCM val = EVALCAR (x, env); |
c96d76b8 | 2732 | if (!SCM_FALSEP (val) && !SCM_NILP (val)) |
302c12b4 DH |
2733 | RETURN (val); |
2734 | else | |
2735 | x = SCM_CDR (x); | |
0f2d19dd | 2736 | } |
6dbd0af5 | 2737 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2738 | goto carloop; |
2739 | ||
2740 | ||
1b43d24c | 2741 | case SCM_BIT7 (SCM_IM_LAMBDA): |
0f2d19dd JB |
2742 | RETURN (scm_closure (SCM_CDR (x), env)); |
2743 | ||
2744 | ||
1b43d24c | 2745 | case SCM_BIT7 (SCM_IM_QUOTE): |
8ea46249 | 2746 | RETURN (SCM_CADR (x)); |
0f2d19dd JB |
2747 | |
2748 | ||
1b43d24c | 2749 | case SCM_BIT7 (SCM_IM_SET_X): |
0f2d19dd | 2750 | x = SCM_CDR (x); |
38ace99e DH |
2751 | { |
2752 | SCM *location; | |
2753 | SCM variable = SCM_CAR (x); | |
e050d4f8 | 2754 | if (SCM_ILOCP (variable)) |
38ace99e | 2755 | location = scm_ilookup (variable, env); |
3063e30a | 2756 | else if (SCM_VARIABLEP (variable)) |
e050d4f8 | 2757 | location = SCM_VARIABLE_LOC (variable); |
38ace99e DH |
2758 | else /* (SCM_SYMBOLP (variable)) is known to be true */ |
2759 | location = scm_lookupcar (x, env, 1); | |
2760 | x = SCM_CDR (x); | |
2761 | *location = EVALCAR (x, env); | |
2762 | } | |
0f2d19dd | 2763 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
2764 | |
2765 | ||
0f2d19dd | 2766 | /* new syntactic forms go here. */ |
1b43d24c | 2767 | case SCM_BIT7 (SCM_MAKISYM (0)): |
0f2d19dd | 2768 | proc = SCM_CAR (x); |
a392ee15 | 2769 | switch (SCM_ISYMNUM (proc)) |
0f2d19dd | 2770 | { |
3f04400d DH |
2771 | |
2772 | ||
22f2cf2d DH |
2773 | case (SCM_ISYMNUM (SCM_IM_DEFINE)): |
2774 | /* Top level defines are handled directly by the memoizer and thus | |
2775 | * will never generate memoized code with SCM_IM_DEFINE. Internal | |
2776 | * defines which occur at valid positions will be transformed into | |
2777 | * letrec expressions. Thus, whenever the executor detects | |
2778 | * SCM_IM_DEFINE, this must come from an internal definition at an | |
2779 | * illegal position. */ | |
2780 | scm_misc_error (NULL, "Bad define placement", SCM_EOL); | |
2781 | ||
2782 | ||
0f2d19dd | 2783 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
e910e9d2 DH |
2784 | x = SCM_CDR (x); |
2785 | proc = EVALCAR (x, env); | |
2786 | PREP_APPLY (proc, SCM_EOL); | |
2787 | x = SCM_CDR (x); | |
2788 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
2789 | |
2790 | apply_proc: | |
2791 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
2792 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
2793 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
2794 | if (SCM_CLOSUREP (proc)) |
2795 | { | |
9a069bdd | 2796 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 2797 | #ifdef DEVAL |
9a069bdd | 2798 | debug.info->a.args = arg1; |
6dbd0af5 | 2799 | #endif |
9a069bdd DH |
2800 | if (scm_badargsp (formals, arg1)) |
2801 | scm_wrong_num_args (proc); | |
2802 | ENTER_APPLY; | |
2803 | /* Copy argument list */ | |
2804 | if (SCM_NULL_OR_NIL_P (arg1)) | |
2805 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
2806 | else | |
2807 | { | |
2808 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
2809 | SCM tail = args; | |
2810 | arg1 = SCM_CDR (arg1); | |
2811 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
2812 | { | |
2813 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
2814 | SCM_SETCDR (tail, new_tail); | |
2815 | tail = new_tail; | |
2816 | arg1 = SCM_CDR (arg1); | |
2817 | } | |
2818 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
2819 | } | |
2820 | ||
2821 | x = SCM_CLOSURE_BODY (proc); | |
2822 | goto nontoplevel_begin; | |
0f2d19dd | 2823 | } |
3f04400d DH |
2824 | else |
2825 | { | |
e910e9d2 DH |
2826 | ENTER_APPLY; |
2827 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
2828 | } |
2829 | ||
0f2d19dd JB |
2830 | |
2831 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
5f144b10 GH |
2832 | { |
2833 | int first; | |
2834 | SCM val = scm_make_continuation (&first); | |
2835 | ||
e050d4f8 | 2836 | if (!first) |
5f144b10 | 2837 | RETURN (val); |
e050d4f8 DH |
2838 | else |
2839 | { | |
2840 | arg1 = val; | |
2841 | proc = SCM_CDR (x); | |
2842 | proc = scm_eval_car (proc, env); | |
e050d4f8 DH |
2843 | PREP_APPLY (proc, scm_list_1 (arg1)); |
2844 | ENTER_APPLY; | |
e050d4f8 DH |
2845 | goto evap1; |
2846 | } | |
5f144b10 | 2847 | } |
e050d4f8 | 2848 | |
0f2d19dd | 2849 | |
a570e93a | 2850 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 2851 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 2852 | |
e050d4f8 | 2853 | |
28d52ebb MD |
2854 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
2855 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); | |
2856 | ||
2857 | ||
c8e1d354 MD |
2858 | /* PLACEHOLDER for case (SCM_ISYMNUM (SCM_IM_DISPATCH)): The |
2859 | following code (type_dispatch) is intended to be the tail | |
2860 | of the case clause for the internal macro | |
2861 | SCM_IM_DISPATCH. Please don't remove it from this | |
2862 | location without discussing it with Mikael | |
2863 | <djurfeldt@nada.kth.se> */ | |
2864 | ||
f12745b6 DH |
2865 | /* The type dispatch code is duplicated below |
2866 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
2867 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 2868 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
2869 | /* Type dispatch means to determine from the types of the function |
2870 | * arguments (i. e. the 'signature' of the call), which method from | |
2871 | * a generic function is to be called. This process of selecting | |
2872 | * the right method takes some time. To speed it up, guile uses | |
2873 | * caching: Together with the macro call to dispatch the signatures | |
2874 | * of some previous calls to that generic function from the same | |
2875 | * place are stored (in the code!) in a cache that we call the | |
2876 | * 'method cache'. This is done since it is likely, that | |
2877 | * consecutive calls to dispatch from that position in the code will | |
2878 | * have the same signature. Thus, the type dispatch works as | |
2879 | * follows: First, determine a hash value from the signature of the | |
2880 | * actual arguments. Second, use this hash value as an index to | |
2881 | * find that same signature in the method cache stored at this | |
2882 | * position in the code. If found, you have also found the | |
2883 | * corresponding method that belongs to that signature. If the | |
2884 | * signature is not found in the method cache, you have to perform a | |
2885 | * full search over all signatures stored with the generic | |
2886 | * function. */ | |
2887 | { | |
2888 | unsigned long int specializers; | |
2889 | unsigned long int hash_value; | |
2890 | unsigned long int cache_end_pos; | |
2891 | unsigned long int mask; | |
2892 | SCM method_cache; | |
2893 | ||
2894 | { | |
2895 | SCM z = SCM_CDDR (x); | |
2896 | SCM tmp = SCM_CADR (z); | |
2897 | specializers = SCM_INUM (SCM_CAR (z)); | |
2898 | ||
2899 | /* Compute a hash value for searching the method cache. There | |
2900 | * are two variants for computing the hash value, a (rather) | |
2901 | * complicated one, and a simple one. For the complicated one | |
2902 | * explained below, tmp holds a number that is used in the | |
2903 | * computation. */ | |
2904 | if (SCM_INUMP (tmp)) | |
2905 | { | |
2906 | /* Use the signature of the actual arguments to determine | |
2907 | * the hash value. This is done as follows: Each class has | |
2908 | * an array of random numbers, that are determined when the | |
2909 | * class is created. The integer 'hashset' is an index into | |
2910 | * that array of random numbers. Now, from all classes that | |
2911 | * are part of the signature of the actual arguments, the | |
2912 | * random numbers at index 'hashset' are taken and summed | |
2913 | * up, giving the hash value. The value of 'hashset' is | |
2914 | * stored at the call to dispatch. This allows to have | |
2915 | * different 'formulas' for calculating the hash value at | |
2916 | * different places where dispatch is called. This allows | |
2917 | * to optimize the hash formula at every individual place | |
2918 | * where dispatch is called, such that hopefully the hash | |
2919 | * value that is computed will directly point to the right | |
2920 | * method in the method cache. */ | |
2921 | unsigned long int hashset = SCM_INUM (tmp); | |
2922 | unsigned long int counter = specializers + 1; | |
dff98306 | 2923 | SCM tmp_arg = arg1; |
f12745b6 DH |
2924 | hash_value = 0; |
2925 | while (!SCM_NULLP (tmp_arg) && counter != 0) | |
61364ba6 | 2926 | { |
f12745b6 DH |
2927 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
2928 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
2929 | tmp_arg = SCM_CDR (tmp_arg); | |
2930 | counter--; | |
61364ba6 | 2931 | } |
f12745b6 DH |
2932 | z = SCM_CDDR (z); |
2933 | method_cache = SCM_CADR (z); | |
2934 | mask = SCM_INUM (SCM_CAR (z)); | |
2935 | hash_value &= mask; | |
2936 | cache_end_pos = hash_value; | |
2937 | } | |
2938 | else | |
2939 | { | |
2940 | /* This method of determining the hash value is much | |
2941 | * simpler: Set the hash value to zero and just perform a | |
2942 | * linear search through the method cache. */ | |
2943 | method_cache = tmp; | |
2944 | mask = (unsigned long int) ((long) -1); | |
2945 | hash_value = 0; | |
2946 | cache_end_pos = SCM_VECTOR_LENGTH (method_cache); | |
2947 | } | |
2948 | } | |
61364ba6 | 2949 | |
f12745b6 DH |
2950 | { |
2951 | /* Search the method cache for a method with a matching | |
2952 | * signature. Start the search at position 'hash_value'. The | |
2953 | * hashing implementation uses linear probing for conflict | |
2954 | * resolution, that is, if the signature in question is not | |
2955 | * found at the starting index in the hash table, the next table | |
2956 | * entry is tried, and so on, until in the worst case the whole | |
2957 | * cache has been searched, but still the signature has not been | |
2958 | * found. */ | |
2959 | SCM z; | |
2960 | do | |
2961 | { | |
dff98306 | 2962 | SCM args = arg1; /* list of arguments */ |
f12745b6 DH |
2963 | z = SCM_VELTS (method_cache)[hash_value]; |
2964 | while (!SCM_NULLP (args)) | |
61364ba6 MD |
2965 | { |
2966 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 DH |
2967 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
2968 | if (!SCM_EQ_P (class_of_arg, SCM_CAR (z))) | |
61364ba6 | 2969 | goto next_method; |
f12745b6 | 2970 | args = SCM_CDR (args); |
61364ba6 MD |
2971 | z = SCM_CDR (z); |
2972 | } | |
f12745b6 DH |
2973 | /* Fewer arguments than specifiers => CAR != ENV */ |
2974 | if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))) | |
2975 | goto apply_cmethod; | |
2976 | next_method: | |
2977 | hash_value = (hash_value + 1) & mask; | |
2978 | } while (hash_value != cache_end_pos); | |
2979 | ||
2980 | /* No appropriate method was found in the cache. */ | |
dff98306 | 2981 | z = scm_memoize_method (x, arg1); |
f12745b6 | 2982 | |
dff98306 | 2983 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
2984 | { |
2985 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 2986 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
2987 | x = SCM_CMETHOD_BODY (z); |
2988 | goto nontoplevel_begin; | |
2989 | } | |
2990 | } | |
61364ba6 | 2991 | } |
73b64342 | 2992 | |
1d15ecd3 | 2993 | |
ca4be6ea MD |
2994 | case (SCM_ISYMNUM (SCM_IM_SLOT_REF)): |
2995 | x = SCM_CDR (x); | |
1d15ecd3 DH |
2996 | { |
2997 | SCM instance = EVALCAR (x, env); | |
2998 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
2999 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); | |
3000 | } | |
3001 | ||
3002 | ||
ca4be6ea MD |
3003 | case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X)): |
3004 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3005 | { |
3006 | SCM instance = EVALCAR (x, env); | |
3007 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3008 | SCM value = EVALCAR (SCM_CDDR (x), env); | |
3009 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3010 | RETURN (SCM_UNSPECIFIED); | |
3011 | } | |
3012 | ||
c96d76b8 | 3013 | |
22721140 | 3014 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3015 | |
73b64342 | 3016 | case (SCM_ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3017 | { |
3018 | SCM test_form = SCM_CDR (x); | |
3019 | x = SCM_CDR (test_form); | |
3020 | while (!SCM_NULL_OR_NIL_P (x)) | |
3021 | { | |
3022 | SCM test_result = EVALCAR (test_form, env); | |
3023 | if (!(SCM_FALSEP (test_result) | |
3024 | || SCM_NULL_OR_NIL_P (test_result))) | |
3025 | { | |
3026 | if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED)) | |
3027 | RETURN (test_result); | |
3028 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3029 | goto carloop; | |
3030 | } | |
3031 | else | |
3032 | { | |
3033 | test_form = SCM_CDR (x); | |
3034 | x = SCM_CDR (test_form); | |
3035 | } | |
3036 | } | |
3037 | x = test_form; | |
3038 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3039 | goto carloop; | |
3040 | } | |
73b64342 | 3041 | |
c96d76b8 | 3042 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 MD |
3043 | |
3044 | case (SCM_ISYMNUM (SCM_IM_BIND)): | |
2e171178 MV |
3045 | { |
3046 | SCM vars, exps, vals; | |
73b64342 | 3047 | |
2e171178 MV |
3048 | x = SCM_CDR (x); |
3049 | vars = SCM_CAAR (x); | |
3050 | exps = SCM_CDAR (x); | |
3051 | ||
3052 | vals = SCM_EOL; | |
3053 | ||
3054 | while (SCM_NIMP (exps)) | |
3055 | { | |
3056 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3057 | exps = SCM_CDR (exps); | |
3058 | } | |
3059 | ||
3060 | scm_swap_bindings (vars, vals); | |
3061 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3062 | |
3063 | /* Ignore all but the last evaluation result. */ | |
3064 | for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x)) | |
2e171178 | 3065 | { |
1d15ecd3 DH |
3066 | if (SCM_CONSP (SCM_CAR (x))) |
3067 | SCM_CEVAL (SCM_CAR (x), env); | |
2e171178 MV |
3068 | } |
3069 | proc = EVALCAR (x, env); | |
73b64342 | 3070 | |
2e171178 MV |
3071 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3072 | scm_swap_bindings (vars, vals); | |
73b64342 | 3073 | |
ddea3325 | 3074 | RETURN (proc); |
2e171178 | 3075 | } |
c96d76b8 | 3076 | |
1d15ecd3 | 3077 | |
a513ead3 MV |
3078 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
3079 | { | |
9a069bdd DH |
3080 | SCM producer; |
3081 | ||
3082 | x = SCM_CDR (x); | |
3083 | producer = EVALCAR (x, env); | |
3084 | x = SCM_CDR (x); | |
3085 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3086 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 DH |
3087 | if (SCM_VALUESP (arg1)) |
3088 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
a513ead3 | 3089 | else |
dff98306 | 3090 | arg1 = scm_list_1 (arg1); |
9a069bdd DH |
3091 | PREP_APPLY (proc, arg1); |
3092 | goto apply_proc; | |
a513ead3 MV |
3093 | } |
3094 | ||
b7798e10 | 3095 | |
0f2d19dd | 3096 | default: |
ddd8f927 | 3097 | goto evapply; |
0f2d19dd JB |
3098 | } |
3099 | ||
3100 | default: | |
3101 | proc = x; | |
ddd8f927 | 3102 | goto evapply; |
0f2d19dd JB |
3103 | case scm_tc7_vector: |
3104 | case scm_tc7_wvect: | |
22721140 | 3105 | #if SCM_HAVE_ARRAYS |
0f2d19dd JB |
3106 | case scm_tc7_bvect: |
3107 | case scm_tc7_byvect: | |
3108 | case scm_tc7_svect: | |
3109 | case scm_tc7_ivect: | |
3110 | case scm_tc7_uvect: | |
3111 | case scm_tc7_fvect: | |
3112 | case scm_tc7_dvect: | |
3113 | case scm_tc7_cvect: | |
3d05f2e0 | 3114 | #if SCM_SIZEOF_LONG_LONG != 0 |
0f2d19dd | 3115 | case scm_tc7_llvect: |
afe5177e | 3116 | #endif |
0f2d19dd | 3117 | #endif |
534c55a9 | 3118 | case scm_tc7_number: |
0f2d19dd | 3119 | case scm_tc7_string: |
0f2d19dd JB |
3120 | case scm_tc7_smob: |
3121 | case scm_tcs_closures: | |
224822be | 3122 | case scm_tc7_cclo: |
89efbff4 | 3123 | case scm_tc7_pws: |
0f2d19dd | 3124 | case scm_tcs_subrs: |
904a077d | 3125 | case scm_tcs_struct: |
0f2d19dd JB |
3126 | RETURN (x); |
3127 | ||
d22a0ea1 | 3128 | case scm_tc7_variable: |
a130e982 | 3129 | RETURN (SCM_VARIABLE_REF(x)); |
d22a0ea1 | 3130 | |
1b43d24c | 3131 | case SCM_BIT7 (SCM_ILOC00): |
0f2d19dd | 3132 | proc = *scm_ilookup (SCM_CAR (x), env); |
ddd8f927 | 3133 | goto checkmacro; |
b7798e10 | 3134 | |
0f2d19dd | 3135 | case scm_tcs_cons_nimcar: |
e050d4f8 | 3136 | if (SCM_SYMBOLP (SCM_CAR (x))) |
0f2d19dd | 3137 | { |
e050d4f8 | 3138 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3139 | { |
3140 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3141 | if (location == NULL) | |
3142 | { | |
3143 | /* we have lost the race, start again. */ | |
3144 | goto dispatch; | |
3145 | } | |
3146 | proc = *location; | |
3147 | } | |
f8769b1d | 3148 | |
22a52da1 | 3149 | if (SCM_MACROP (proc)) |
0f2d19dd | 3150 | { |
86d31dfe MV |
3151 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3152 | lookupcar */ | |
e050d4f8 | 3153 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3154 | #ifdef DEVAL |
7c354052 MD |
3155 | /* Set a flag during macro expansion so that macro |
3156 | application frames can be deleted from the backtrace. */ | |
3157 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3158 | #endif |
dff98306 | 3159 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
f8769b1d MV |
3160 | scm_cons (env, scm_listofnull)); |
3161 | ||
7c354052 MD |
3162 | #ifdef DEVAL |
3163 | SCM_CLEAR_MACROEXP (debug); | |
3164 | #endif | |
22a52da1 | 3165 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3166 | { |
3b88ed2a | 3167 | case 3: |
0f2d19dd | 3168 | case 2: |
dff98306 DH |
3169 | if (scm_ilength (arg1) <= 0) |
3170 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); | |
6dbd0af5 | 3171 | #ifdef DEVAL |
22a52da1 | 3172 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3173 | { |
6dbd0af5 | 3174 | SCM_DEFER_INTS; |
dff98306 DH |
3175 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3176 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
3177 | SCM_ALLOW_INTS; |
3178 | goto dispatch; | |
3179 | } | |
3180 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
3181 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
3182 | SCM_CAR (x), | |
3183 | SCM_CDR (x)); | |
6dbd0af5 | 3184 | #endif |
0f2d19dd | 3185 | SCM_DEFER_INTS; |
dff98306 DH |
3186 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3187 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 3188 | SCM_ALLOW_INTS; |
680516ba DH |
3189 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3190 | goto loop; | |
3063e30a | 3191 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 3192 | case 1: |
680516ba DH |
3193 | x = arg1; |
3194 | if (SCM_NIMP (x)) | |
3195 | { | |
3196 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3197 | goto loop; | |
3198 | } | |
3199 | else | |
3200 | RETURN (arg1); | |
3063e30a | 3201 | #endif |
0f2d19dd | 3202 | case 0: |
dff98306 | 3203 | RETURN (arg1); |
0f2d19dd JB |
3204 | } |
3205 | } | |
3206 | } | |
3207 | else | |
3208 | proc = SCM_CEVAL (SCM_CAR (x), env); | |
bd987b8e | 3209 | |
ddd8f927 DH |
3210 | checkmacro: |
3211 | if (SCM_MACROP (proc)) | |
0f2d19dd | 3212 | goto handle_a_macro; |
0f2d19dd JB |
3213 | } |
3214 | ||
3215 | ||
e050d4f8 | 3216 | evapply: /* inputs: x, proc */ |
6dbd0af5 MD |
3217 | PREP_APPLY (proc, SCM_EOL); |
3218 | if (SCM_NULLP (SCM_CDR (x))) { | |
3219 | ENTER_APPLY; | |
89efbff4 | 3220 | evap0: |
ddd8f927 | 3221 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
3222 | switch (SCM_TYP7 (proc)) |
3223 | { /* no arguments given */ | |
3224 | case scm_tc7_subr_0: | |
3225 | RETURN (SCM_SUBRF (proc) ()); | |
3226 | case scm_tc7_subr_1o: | |
3227 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
3228 | case scm_tc7_lsubr: | |
3229 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
3230 | case scm_tc7_rpsubr: | |
3231 | RETURN (SCM_BOOL_T); | |
3232 | case scm_tc7_asubr: | |
3233 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 3234 | case scm_tc7_smob: |
68b06924 | 3235 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 3236 | goto badfun; |
68b06924 | 3237 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 3238 | case scm_tc7_cclo: |
dff98306 | 3239 | arg1 = proc; |
0f2d19dd | 3240 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
3241 | #ifdef DEVAL |
3242 | debug.info->a.proc = proc; | |
dff98306 | 3243 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3244 | #endif |
0f2d19dd | 3245 | goto evap1; |
89efbff4 MD |
3246 | case scm_tc7_pws: |
3247 | proc = SCM_PROCEDURE (proc); | |
3248 | #ifdef DEVAL | |
3249 | debug.info->a.proc = proc; | |
3250 | #endif | |
002f1a5d MD |
3251 | if (!SCM_CLOSUREP (proc)) |
3252 | goto evap0; | |
ddd8f927 | 3253 | /* fallthrough */ |
0f2d19dd | 3254 | case scm_tcs_closures: |
ddd8f927 DH |
3255 | { |
3256 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3257 | if (SCM_CONSP (formals)) | |
3258 | goto umwrongnumargs; | |
3259 | x = SCM_CLOSURE_BODY (proc); | |
3260 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3261 | goto nontoplevel_begin; | |
3262 | } | |
904a077d | 3263 | case scm_tcs_struct: |
195847fa MD |
3264 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
3265 | { | |
3266 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 3267 | arg1 = SCM_EOL; |
195847fa MD |
3268 | goto type_dispatch; |
3269 | } | |
2ca0d207 | 3270 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 3271 | { |
dff98306 | 3272 | arg1 = proc; |
195847fa MD |
3273 | proc = (SCM_I_ENTITYP (proc) |
3274 | ? SCM_ENTITY_PROCEDURE (proc) | |
3275 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 3276 | #ifdef DEVAL |
195847fa | 3277 | debug.info->a.proc = proc; |
dff98306 | 3278 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 3279 | #endif |
ddd8f927 | 3280 | goto evap1; |
da7f71d7 | 3281 | } |
2ca0d207 DH |
3282 | else |
3283 | goto badfun; | |
0f2d19dd JB |
3284 | case scm_tc7_subr_1: |
3285 | case scm_tc7_subr_2: | |
3286 | case scm_tc7_subr_2o: | |
14b18ed6 | 3287 | case scm_tc7_dsubr: |
0f2d19dd JB |
3288 | case scm_tc7_cxr: |
3289 | case scm_tc7_subr_3: | |
3290 | case scm_tc7_lsubr_2: | |
3291 | umwrongnumargs: | |
3292 | unmemocar (x, env); | |
f5bf2977 | 3293 | scm_wrong_num_args (proc); |
0f2d19dd | 3294 | default: |
ddd8f927 DH |
3295 | badfun: |
3296 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 3297 | } |
6dbd0af5 | 3298 | } |
0f2d19dd JB |
3299 | |
3300 | /* must handle macros by here */ | |
3301 | x = SCM_CDR (x); | |
dff98306 DH |
3302 | if (SCM_CONSP (x)) |
3303 | arg1 = EVALCAR (x, env); | |
680ed4a8 | 3304 | else |
ab1f1094 | 3305 | scm_wrong_num_args (proc); |
6dbd0af5 | 3306 | #ifdef DEVAL |
dff98306 | 3307 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3308 | #endif |
0f2d19dd | 3309 | x = SCM_CDR (x); |
42030fb2 DH |
3310 | { |
3311 | SCM arg2; | |
3312 | if (SCM_NULLP (x)) | |
3313 | { | |
3314 | ENTER_APPLY; | |
3315 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 3316 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3317 | switch (SCM_TYP7 (proc)) |
3318 | { /* have one argument in arg1 */ | |
3319 | case scm_tc7_subr_2o: | |
3320 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3321 | case scm_tc7_subr_1: | |
3322 | case scm_tc7_subr_1o: | |
3323 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
3324 | case scm_tc7_dsubr: |
3325 | if (SCM_INUMP (arg1)) | |
3326 | { | |
3327 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
3328 | } | |
3329 | else if (SCM_REALP (arg1)) | |
3330 | { | |
3331 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
3332 | } | |
3333 | else if (SCM_BIGP (arg1)) | |
3334 | { | |
3335 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
3336 | } | |
3337 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
3338 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
42030fb2 | 3339 | case scm_tc7_cxr: |
42030fb2 | 3340 | { |
14b18ed6 DH |
3341 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
3342 | do | |
3343 | { | |
3344 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
3345 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
3346 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
3347 | pattern >>= 2; | |
3348 | } while (pattern); | |
42030fb2 | 3349 | RETURN (arg1); |
0f2d19dd | 3350 | } |
42030fb2 DH |
3351 | case scm_tc7_rpsubr: |
3352 | RETURN (SCM_BOOL_T); | |
3353 | case scm_tc7_asubr: | |
3354 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3355 | case scm_tc7_lsubr: | |
0f2d19dd | 3356 | #ifdef DEVAL |
42030fb2 | 3357 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 3358 | #else |
42030fb2 | 3359 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 3360 | #endif |
42030fb2 DH |
3361 | case scm_tc7_smob: |
3362 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3363 | goto badfun; | |
3364 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
3365 | case scm_tc7_cclo: | |
3366 | arg2 = arg1; | |
3367 | arg1 = proc; | |
3368 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 3369 | #ifdef DEVAL |
42030fb2 DH |
3370 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3371 | debug.info->a.proc = proc; | |
6dbd0af5 | 3372 | #endif |
42030fb2 DH |
3373 | goto evap2; |
3374 | case scm_tc7_pws: | |
3375 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 3376 | #ifdef DEVAL |
42030fb2 | 3377 | debug.info->a.proc = proc; |
89efbff4 | 3378 | #endif |
42030fb2 DH |
3379 | if (!SCM_CLOSUREP (proc)) |
3380 | goto evap1; | |
ddd8f927 | 3381 | /* fallthrough */ |
42030fb2 | 3382 | case scm_tcs_closures: |
ddd8f927 DH |
3383 | { |
3384 | /* clos1: */ | |
3385 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3386 | if (SCM_NULLP (formals) | |
3387 | || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals)))) | |
3388 | goto umwrongnumargs; | |
3389 | x = SCM_CLOSURE_BODY (proc); | |
0f2d19dd | 3390 | #ifdef DEVAL |
ddd8f927 DH |
3391 | env = SCM_EXTEND_ENV (formals, |
3392 | debug.info->a.args, | |
3393 | SCM_ENV (proc)); | |
0f2d19dd | 3394 | #else |
ddd8f927 DH |
3395 | env = SCM_EXTEND_ENV (formals, |
3396 | scm_list_1 (arg1), | |
3397 | SCM_ENV (proc)); | |
0f2d19dd | 3398 | #endif |
ddd8f927 DH |
3399 | goto nontoplevel_begin; |
3400 | } | |
42030fb2 DH |
3401 | case scm_tcs_struct: |
3402 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3403 | { | |
3404 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 3405 | #ifdef DEVAL |
42030fb2 | 3406 | arg1 = debug.info->a.args; |
f3d2630a | 3407 | #else |
42030fb2 | 3408 | arg1 = scm_list_1 (arg1); |
f3d2630a | 3409 | #endif |
42030fb2 DH |
3410 | goto type_dispatch; |
3411 | } | |
2ca0d207 | 3412 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3413 | { |
3414 | arg2 = arg1; | |
3415 | arg1 = proc; | |
3416 | proc = (SCM_I_ENTITYP (proc) | |
3417 | ? SCM_ENTITY_PROCEDURE (proc) | |
3418 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 3419 | #ifdef DEVAL |
42030fb2 DH |
3420 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3421 | debug.info->a.proc = proc; | |
0c32d76c | 3422 | #endif |
ddd8f927 | 3423 | goto evap2; |
42030fb2 | 3424 | } |
2ca0d207 DH |
3425 | else |
3426 | goto badfun; | |
42030fb2 DH |
3427 | case scm_tc7_subr_2: |
3428 | case scm_tc7_subr_0: | |
3429 | case scm_tc7_subr_3: | |
3430 | case scm_tc7_lsubr_2: | |
ab1f1094 | 3431 | scm_wrong_num_args (proc); |
42030fb2 DH |
3432 | default: |
3433 | goto badfun; | |
3434 | } | |
3435 | } | |
42030fb2 DH |
3436 | if (SCM_CONSP (x)) |
3437 | arg2 = EVALCAR (x, env); | |
3438 | else | |
ab1f1094 | 3439 | scm_wrong_num_args (proc); |
bd987b8e | 3440 | |
42030fb2 | 3441 | { /* have two or more arguments */ |
6dbd0af5 | 3442 | #ifdef DEVAL |
42030fb2 | 3443 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 3444 | #endif |
42030fb2 DH |
3445 | x = SCM_CDR (x); |
3446 | if (SCM_NULLP (x)) { | |
3447 | ENTER_APPLY; | |
3448 | evap2: | |
ddd8f927 | 3449 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3450 | switch (SCM_TYP7 (proc)) |
3451 | { /* have two arguments */ | |
3452 | case scm_tc7_subr_2: | |
3453 | case scm_tc7_subr_2o: | |
3454 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3455 | case scm_tc7_lsubr: | |
0f2d19dd | 3456 | #ifdef DEVAL |
42030fb2 | 3457 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 3458 | #else |
42030fb2 DH |
3459 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
3460 | #endif | |
3461 | case scm_tc7_lsubr_2: | |
3462 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
3463 | case scm_tc7_rpsubr: | |
3464 | case scm_tc7_asubr: | |
3465 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3466 | case scm_tc7_smob: | |
3467 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3468 | goto badfun; | |
3469 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
3470 | cclon: | |
3471 | case scm_tc7_cclo: | |
0f2d19dd | 3472 | #ifdef DEVAL |
42030fb2 DH |
3473 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3474 | scm_cons (proc, debug.info->a.args), | |
3475 | SCM_EOL)); | |
0f2d19dd | 3476 | #else |
42030fb2 DH |
3477 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3478 | scm_cons2 (proc, arg1, | |
3479 | scm_cons (arg2, | |
3480 | scm_eval_args (x, | |
3481 | env, | |
3482 | proc))), | |
3483 | SCM_EOL)); | |
3484 | #endif | |
3485 | case scm_tcs_struct: | |
3486 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3487 | { | |
3488 | x = SCM_ENTITY_PROCEDURE (proc); | |
3489 | #ifdef DEVAL | |
3490 | arg1 = debug.info->a.args; | |
3491 | #else | |
3492 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 3493 | #endif |
42030fb2 DH |
3494 | goto type_dispatch; |
3495 | } | |
2ca0d207 | 3496 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3497 | { |
3498 | operatorn: | |
f3d2630a | 3499 | #ifdef DEVAL |
42030fb2 DH |
3500 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3501 | ? SCM_ENTITY_PROCEDURE (proc) | |
3502 | : SCM_OPERATOR_PROCEDURE (proc), | |
3503 | scm_cons (proc, debug.info->a.args), | |
3504 | SCM_EOL)); | |
f3d2630a | 3505 | #else |
42030fb2 DH |
3506 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3507 | ? SCM_ENTITY_PROCEDURE (proc) | |
3508 | : SCM_OPERATOR_PROCEDURE (proc), | |
3509 | scm_cons2 (proc, arg1, | |
3510 | scm_cons (arg2, | |
3511 | scm_eval_args (x, | |
3512 | env, | |
3513 | proc))), | |
3514 | SCM_EOL)); | |
f3d2630a | 3515 | #endif |
42030fb2 | 3516 | } |
2ca0d207 DH |
3517 | else |
3518 | goto badfun; | |
42030fb2 | 3519 | case scm_tc7_subr_0: |
14b18ed6 | 3520 | case scm_tc7_dsubr: |
42030fb2 DH |
3521 | case scm_tc7_cxr: |
3522 | case scm_tc7_subr_1o: | |
3523 | case scm_tc7_subr_1: | |
3524 | case scm_tc7_subr_3: | |
ab1f1094 | 3525 | scm_wrong_num_args (proc); |
42030fb2 | 3526 | default: |
9b07e212 | 3527 | goto badfun; |
42030fb2 DH |
3528 | case scm_tc7_pws: |
3529 | proc = SCM_PROCEDURE (proc); | |
3530 | #ifdef DEVAL | |
3531 | debug.info->a.proc = proc; | |
3532 | #endif | |
3533 | if (!SCM_CLOSUREP (proc)) | |
3534 | goto evap2; | |
ddd8f927 | 3535 | /* fallthrough */ |
42030fb2 | 3536 | case scm_tcs_closures: |
ddd8f927 DH |
3537 | { |
3538 | /* clos2: */ | |
3539 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3540 | if (SCM_NULLP (formals) | |
3541 | || (SCM_CONSP (formals) | |
3542 | && (SCM_NULLP (SCM_CDR (formals)) | |
3543 | || (SCM_CONSP (SCM_CDR (formals)) | |
3544 | && SCM_CONSP (SCM_CDDR (formals)))))) | |
3545 | goto umwrongnumargs; | |
0c32d76c | 3546 | #ifdef DEVAL |
ddd8f927 DH |
3547 | env = SCM_EXTEND_ENV (formals, |
3548 | debug.info->a.args, | |
3549 | SCM_ENV (proc)); | |
195847fa | 3550 | #else |
ddd8f927 DH |
3551 | env = SCM_EXTEND_ENV (formals, |
3552 | scm_list_2 (arg1, arg2), | |
3553 | SCM_ENV (proc)); | |
195847fa | 3554 | #endif |
ddd8f927 DH |
3555 | x = SCM_CLOSURE_BODY (proc); |
3556 | goto nontoplevel_begin; | |
3557 | } | |
42030fb2 DH |
3558 | } |
3559 | } | |
42030fb2 | 3560 | if (!SCM_CONSP (x)) |
ab1f1094 | 3561 | scm_wrong_num_args (proc); |
42030fb2 DH |
3562 | #ifdef DEVAL |
3563 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
3564 | deval_args (x, env, proc, | |
3565 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
3566 | #endif | |
3567 | ENTER_APPLY; | |
3568 | evap3: | |
ddd8f927 | 3569 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3570 | switch (SCM_TYP7 (proc)) |
3571 | { /* have 3 or more arguments */ | |
3572 | #ifdef DEVAL | |
6dbd0af5 | 3573 | case scm_tc7_subr_3: |
ab1f1094 DH |
3574 | if (!SCM_NULLP (SCM_CDR (x))) |
3575 | scm_wrong_num_args (proc); | |
3576 | else | |
3577 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
3578 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
3579 | case scm_tc7_asubr: |
3580 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
3581 | arg2 = SCM_CDDR (debug.info->a.args); | |
3582 | do | |
3583 | { | |
3584 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
3585 | arg2 = SCM_CDR (arg2); | |
3586 | } | |
3587 | while (SCM_NIMP (arg2)); | |
3588 | RETURN (arg1); | |
3589 | case scm_tc7_rpsubr: | |
3590 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
3591 | RETURN (SCM_BOOL_F); | |
3592 | arg1 = SCM_CDDR (debug.info->a.args); | |
3593 | do | |
3594 | { | |
3595 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) | |
3596 | RETURN (SCM_BOOL_F); | |
3597 | arg2 = SCM_CAR (arg1); | |
3598 | arg1 = SCM_CDR (arg1); | |
3599 | } | |
3600 | while (SCM_NIMP (arg1)); | |
3601 | RETURN (SCM_BOOL_T); | |
3602 | case scm_tc7_lsubr_2: | |
3603 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
3604 | SCM_CDDR (debug.info->a.args))); | |
3605 | case scm_tc7_lsubr: | |
3606 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
3607 | case scm_tc7_smob: | |
3608 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3609 | goto badfun; | |
3610 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
3611 | SCM_CDDR (debug.info->a.args))); | |
3612 | case scm_tc7_cclo: | |
3613 | goto cclon; | |
002f1a5d MD |
3614 | case scm_tc7_pws: |
3615 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 3616 | debug.info->a.proc = proc; |
002f1a5d | 3617 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 3618 | goto evap3; |
ddd8f927 | 3619 | /* fallthrough */ |
6dbd0af5 | 3620 | case scm_tcs_closures: |
ddd8f927 DH |
3621 | { |
3622 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3623 | if (SCM_NULLP (formals) | |
3624 | || (SCM_CONSP (formals) | |
3625 | && (SCM_NULLP (SCM_CDR (formals)) | |
3626 | || (SCM_CONSP (SCM_CDR (formals)) | |
3627 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
3628 | goto umwrongnumargs; | |
3629 | SCM_SET_ARGSREADY (debug); | |
3630 | env = SCM_EXTEND_ENV (formals, | |
3631 | debug.info->a.args, | |
3632 | SCM_ENV (proc)); | |
3633 | x = SCM_CLOSURE_BODY (proc); | |
3634 | goto nontoplevel_begin; | |
3635 | } | |
6dbd0af5 | 3636 | #else /* DEVAL */ |
42030fb2 | 3637 | case scm_tc7_subr_3: |
ab1f1094 DH |
3638 | if (!SCM_NULLP (SCM_CDR (x))) |
3639 | scm_wrong_num_args (proc); | |
3640 | else | |
3641 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
3642 | case scm_tc7_asubr: |
3643 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
3644 | do | |
3645 | { | |
3646 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
3647 | x = SCM_CDR(x); | |
3648 | } | |
3649 | while (SCM_NIMP (x)); | |
3650 | RETURN (arg1); | |
3651 | case scm_tc7_rpsubr: | |
3652 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
3653 | RETURN (SCM_BOOL_F); | |
3654 | do | |
3655 | { | |
3656 | arg1 = EVALCAR (x, env); | |
3657 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1))) | |
3658 | RETURN (SCM_BOOL_F); | |
3659 | arg2 = arg1; | |
3660 | x = SCM_CDR (x); | |
3661 | } | |
3662 | while (SCM_NIMP (x)); | |
3663 | RETURN (SCM_BOOL_T); | |
3664 | case scm_tc7_lsubr_2: | |
3665 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
3666 | case scm_tc7_lsubr: | |
3667 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
3668 | arg2, | |
3669 | scm_eval_args (x, env, proc)))); | |
3670 | case scm_tc7_smob: | |
3671 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3672 | goto badfun; | |
3673 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
3674 | scm_eval_args (x, env, proc))); | |
3675 | case scm_tc7_cclo: | |
3676 | goto cclon; | |
3677 | case scm_tc7_pws: | |
3678 | proc = SCM_PROCEDURE (proc); | |
3679 | if (!SCM_CLOSUREP (proc)) | |
3680 | goto evap3; | |
ddd8f927 DH |
3681 | /* fallthrough */ |
3682 | case scm_tcs_closures: | |
da7f71d7 | 3683 | { |
ddd8f927 | 3684 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
42030fb2 DH |
3685 | if (SCM_NULLP (formals) |
3686 | || (SCM_CONSP (formals) | |
3687 | && (SCM_NULLP (SCM_CDR (formals)) | |
3688 | || (SCM_CONSP (SCM_CDR (formals)) | |
3689 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
3690 | goto umwrongnumargs; | |
ddd8f927 DH |
3691 | env = SCM_EXTEND_ENV (formals, |
3692 | scm_cons2 (arg1, | |
3693 | arg2, | |
3694 | scm_eval_args (x, env, proc)), | |
3695 | SCM_ENV (proc)); | |
3696 | x = SCM_CLOSURE_BODY (proc); | |
3697 | goto nontoplevel_begin; | |
da7f71d7 | 3698 | } |
0f2d19dd | 3699 | #endif /* DEVAL */ |
42030fb2 DH |
3700 | case scm_tcs_struct: |
3701 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3702 | { | |
f3d2630a | 3703 | #ifdef DEVAL |
42030fb2 | 3704 | arg1 = debug.info->a.args; |
f3d2630a | 3705 | #else |
42030fb2 | 3706 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 3707 | #endif |
42030fb2 DH |
3708 | x = SCM_ENTITY_PROCEDURE (proc); |
3709 | goto type_dispatch; | |
3710 | } | |
2ca0d207 | 3711 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 3712 | goto operatorn; |
2ca0d207 DH |
3713 | else |
3714 | goto badfun; | |
42030fb2 DH |
3715 | case scm_tc7_subr_2: |
3716 | case scm_tc7_subr_1o: | |
3717 | case scm_tc7_subr_2o: | |
3718 | case scm_tc7_subr_0: | |
14b18ed6 | 3719 | case scm_tc7_dsubr: |
42030fb2 DH |
3720 | case scm_tc7_cxr: |
3721 | case scm_tc7_subr_1: | |
ab1f1094 | 3722 | scm_wrong_num_args (proc); |
42030fb2 | 3723 | default: |
9b07e212 | 3724 | goto badfun; |
42030fb2 DH |
3725 | } |
3726 | } | |
0f2d19dd JB |
3727 | } |
3728 | #ifdef DEVAL | |
6dbd0af5 | 3729 | exit: |
5132eef0 | 3730 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 3731 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 3732 | { |
b7ff98dd MD |
3733 | SCM_CLEAR_TRACED_FRAME (debug); |
3734 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 3735 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
3736 | else |
3737 | { | |
5f144b10 GH |
3738 | int first; |
3739 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 3740 | |
5f144b10 | 3741 | if (first) |
dff98306 | 3742 | arg1 = val; |
5f144b10 | 3743 | else |
6dbd0af5 | 3744 | { |
5f144b10 | 3745 | proc = val; |
6dbd0af5 MD |
3746 | goto ret; |
3747 | } | |
3748 | } | |
d95c0b76 | 3749 | SCM_TRAPS_P = 0; |
dff98306 | 3750 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 3751 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
3752 | } |
3753 | ret: | |
1646d37b | 3754 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
3755 | return proc; |
3756 | #endif | |
3757 | } | |
3758 | ||
6dbd0af5 MD |
3759 | |
3760 | /* SECTION: This code is compiled once. | |
3761 | */ | |
3762 | ||
0f2d19dd JB |
3763 | #ifndef DEVAL |
3764 | ||
fdc28395 | 3765 | \f |
d0b07b5d | 3766 | |
fdc28395 KN |
3767 | /* Simple procedure calls |
3768 | */ | |
3769 | ||
3770 | SCM | |
3771 | scm_call_0 (SCM proc) | |
3772 | { | |
3773 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
3774 | } | |
3775 | ||
3776 | SCM | |
3777 | scm_call_1 (SCM proc, SCM arg1) | |
3778 | { | |
3779 | return scm_apply (proc, arg1, scm_listofnull); | |
3780 | } | |
3781 | ||
3782 | SCM | |
3783 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
3784 | { | |
3785 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
3786 | } | |
3787 | ||
3788 | SCM | |
3789 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
3790 | { | |
3791 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
3792 | } | |
3793 | ||
d95c0b76 NJ |
3794 | SCM |
3795 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
3796 | { | |
3797 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
3798 | scm_cons (arg4, scm_listofnull))); | |
3799 | } | |
3800 | ||
fdc28395 KN |
3801 | /* Simple procedure applies |
3802 | */ | |
3803 | ||
3804 | SCM | |
3805 | scm_apply_0 (SCM proc, SCM args) | |
3806 | { | |
3807 | return scm_apply (proc, args, SCM_EOL); | |
3808 | } | |
3809 | ||
3810 | SCM | |
3811 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
3812 | { | |
3813 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
3814 | } | |
3815 | ||
3816 | SCM | |
3817 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
3818 | { | |
3819 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
3820 | } | |
3821 | ||
3822 | SCM | |
3823 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
3824 | { | |
3825 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
3826 | SCM_EOL); | |
3827 | } | |
3828 | ||
82a2622a | 3829 | /* This code processes the arguments to apply: |
b145c172 JB |
3830 | |
3831 | (apply PROC ARG1 ... ARGS) | |
3832 | ||
82a2622a JB |
3833 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
3834 | ... arguments onto the front of ARGS, and returns the resulting | |
3835 | list. Note that ARGS is a list; thus, the argument to this | |
3836 | function is a list whose last element is a list. | |
3837 | ||
3838 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
3839 | result. apply:nconc2last takes care of building the list of |
3840 | arguments, given (ARG1 ... ARGS). | |
3841 | ||
82a2622a JB |
3842 | Rather than do new consing, apply:nconc2last destroys its argument. |
3843 | On that topic, this code came into my care with the following | |
3844 | beautifully cryptic comment on that topic: "This will only screw | |
3845 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
3846 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 3847 | |
3b3b36dd | 3848 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
3849 | (SCM lst), |
3850 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
3851 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
3852 | "@var{args}, and returns the resulting list. Note that\n" | |
3853 | "@var{args} is a list; thus, the argument to this function is\n" | |
3854 | "a list whose last element is a list.\n" | |
3855 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
3856 | "destroys its argument, so use with care.") | |
1bbd0b84 | 3857 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
3858 | { |
3859 | SCM *lloc; | |
34d19ef6 | 3860 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 3861 | lloc = &lst; |
c96d76b8 NJ |
3862 | while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be |
3863 | SCM_NULL_OR_NIL_P, but not | |
3864 | needed in 99.99% of cases, | |
3865 | and it could seriously hurt | |
3866 | performance. - Neil */ | |
a23afe53 | 3867 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 3868 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
3869 | *lloc = SCM_CAR (*lloc); |
3870 | return lst; | |
3871 | } | |
1bbd0b84 | 3872 | #undef FUNC_NAME |
0f2d19dd JB |
3873 | |
3874 | #endif /* !DEVAL */ | |
3875 | ||
6dbd0af5 MD |
3876 | |
3877 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
3878 | * It is compiled twice. | |
3879 | */ | |
3880 | ||
0f2d19dd | 3881 | #if 0 |
0f2d19dd | 3882 | SCM |
6e8d25a6 | 3883 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
3884 | {} |
3885 | #endif | |
3886 | ||
3887 | #if 0 | |
0f2d19dd | 3888 | SCM |
6e8d25a6 | 3889 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 3890 | {} |
0f2d19dd JB |
3891 | #endif |
3892 | ||
1cc91f1b | 3893 | |
82a2622a JB |
3894 | /* Apply a function to a list of arguments. |
3895 | ||
3896 | This function is exported to the Scheme level as taking two | |
3897 | required arguments and a tail argument, as if it were: | |
3898 | (lambda (proc arg1 . args) ...) | |
3899 | Thus, if you just have a list of arguments to pass to a procedure, | |
3900 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
3901 | args, pass the first as ARG1, then cons any remaining fixed args | |
3902 | onto the front of your argument list, and pass that as ARGS. */ | |
3903 | ||
0f2d19dd | 3904 | SCM |
1bbd0b84 | 3905 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 3906 | { |
0f2d19dd | 3907 | #ifdef DEVAL |
92c2555f MV |
3908 | scm_t_debug_frame debug; |
3909 | scm_t_debug_info debug_vect_body; | |
1646d37b | 3910 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 3911 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 3912 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
3913 | debug.vect[0].a.proc = proc; |
3914 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 3915 | scm_last_debug_frame = &debug; |
0f2d19dd | 3916 | #else |
b7ff98dd | 3917 | if (SCM_DEBUGGINGP) |
0f2d19dd | 3918 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
3919 | #endif |
3920 | ||
3921 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
3922 | |
3923 | /* If ARGS is the empty list, then we're calling apply with only two | |
3924 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
3925 | the case, futz with things so that ARG1 is the first argument to | |
3926 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
3927 | rest. |
3928 | ||
3929 | Setting the debug apply frame args this way is pretty messy. | |
3930 | Perhaps we should store arg1 and args directly in the frame as | |
3931 | received, and let scm_frame_arguments unpack them, because that's | |
3932 | a relatively rare operation. This works for now; if the Guile | |
3933 | developer archives are still around, see Mikael's post of | |
3934 | 11-Apr-97. */ | |
0f2d19dd JB |
3935 | if (SCM_NULLP (args)) |
3936 | { | |
3937 | if (SCM_NULLP (arg1)) | |
30000774 JB |
3938 | { |
3939 | arg1 = SCM_UNDEFINED; | |
3940 | #ifdef DEVAL | |
3941 | debug.vect[0].a.args = SCM_EOL; | |
3942 | #endif | |
3943 | } | |
0f2d19dd JB |
3944 | else |
3945 | { | |
30000774 JB |
3946 | #ifdef DEVAL |
3947 | debug.vect[0].a.args = arg1; | |
3948 | #endif | |
0f2d19dd JB |
3949 | args = SCM_CDR (arg1); |
3950 | arg1 = SCM_CAR (arg1); | |
3951 | } | |
3952 | } | |
3953 | else | |
3954 | { | |
0f2d19dd | 3955 | args = scm_nconc2last (args); |
30000774 JB |
3956 | #ifdef DEVAL |
3957 | debug.vect[0].a.args = scm_cons (arg1, args); | |
3958 | #endif | |
0f2d19dd | 3959 | } |
0f2d19dd | 3960 | #ifdef DEVAL |
b6d75948 | 3961 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
3962 | { |
3963 | SCM tmp; | |
b7ff98dd | 3964 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 3965 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
3966 | else |
3967 | { | |
5f144b10 GH |
3968 | int first; |
3969 | ||
3970 | tmp = scm_make_continuation (&first); | |
3971 | if (!first) | |
6dbd0af5 MD |
3972 | goto entap; |
3973 | } | |
d95c0b76 NJ |
3974 | SCM_TRAPS_P = 0; |
3975 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
3976 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
3977 | } |
3978 | entap: | |
3979 | ENTER_APPLY; | |
3980 | #endif | |
6dbd0af5 | 3981 | tail: |
0f2d19dd JB |
3982 | switch (SCM_TYP7 (proc)) |
3983 | { | |
3984 | case scm_tc7_subr_2o: | |
3985 | args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args); | |
ddea3325 | 3986 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 3987 | case scm_tc7_subr_2: |
ab1f1094 DH |
3988 | if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args))) |
3989 | scm_wrong_num_args (proc); | |
0f2d19dd | 3990 | args = SCM_CAR (args); |
ddea3325 | 3991 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 3992 | case scm_tc7_subr_0: |
ab1f1094 DH |
3993 | if (!SCM_UNBNDP (arg1)) |
3994 | scm_wrong_num_args (proc); | |
3995 | else | |
3996 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 3997 | case scm_tc7_subr_1: |
ab1f1094 DH |
3998 | if (SCM_UNBNDP (arg1)) |
3999 | scm_wrong_num_args (proc); | |
0f2d19dd | 4000 | case scm_tc7_subr_1o: |
ab1f1094 DH |
4001 | if (!SCM_NULLP (args)) |
4002 | scm_wrong_num_args (proc); | |
4003 | else | |
4004 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
4005 | case scm_tc7_dsubr: |
4006 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) | |
4007 | scm_wrong_num_args (proc); | |
4008 | if (SCM_INUMP (arg1)) | |
4009 | { | |
4010 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4011 | } | |
4012 | else if (SCM_REALP (arg1)) | |
4013 | { | |
4014 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4015 | } | |
4016 | else if (SCM_BIGP (arg1)) | |
4017 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4018 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
4019 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
0f2d19dd | 4020 | case scm_tc7_cxr: |
ab1f1094 DH |
4021 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) |
4022 | scm_wrong_num_args (proc); | |
0f2d19dd | 4023 | { |
14b18ed6 DH |
4024 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4025 | do | |
4026 | { | |
4027 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4028 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4029 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4030 | pattern >>= 2; | |
4031 | } while (pattern); | |
4032 | RETURN (arg1); | |
0f2d19dd JB |
4033 | } |
4034 | case scm_tc7_subr_3: | |
ab1f1094 DH |
4035 | if (SCM_NULLP (args) |
4036 | || SCM_NULLP (SCM_CDR (args)) | |
4037 | || !SCM_NULLP (SCM_CDDR (args))) | |
4038 | scm_wrong_num_args (proc); | |
4039 | else | |
4040 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4041 | case scm_tc7_lsubr: |
4042 | #ifdef DEVAL | |
ddea3325 | 4043 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4044 | #else |
ddea3325 | 4045 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4046 | #endif |
4047 | case scm_tc7_lsubr_2: | |
ab1f1094 DH |
4048 | if (!SCM_CONSP (args)) |
4049 | scm_wrong_num_args (proc); | |
4050 | else | |
4051 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd JB |
4052 | case scm_tc7_asubr: |
4053 | if (SCM_NULLP (args)) | |
ddea3325 | 4054 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4055 | while (SCM_NIMP (args)) |
4056 | { | |
4057 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4058 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); | |
4059 | args = SCM_CDR (args); | |
4060 | } | |
4061 | RETURN (arg1); | |
4062 | case scm_tc7_rpsubr: | |
4063 | if (SCM_NULLP (args)) | |
4064 | RETURN (SCM_BOOL_T); | |
4065 | while (SCM_NIMP (args)) | |
4066 | { | |
4067 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4068 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) | |
4069 | RETURN (SCM_BOOL_F); | |
4070 | arg1 = SCM_CAR (args); | |
4071 | args = SCM_CDR (args); | |
4072 | } | |
4073 | RETURN (SCM_BOOL_T); | |
4074 | case scm_tcs_closures: | |
4075 | #ifdef DEVAL | |
6dbd0af5 | 4076 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4077 | #else |
4078 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4079 | #endif | |
726d810a | 4080 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4081 | scm_wrong_num_args (proc); |
1609038c MD |
4082 | |
4083 | /* Copy argument list */ | |
4084 | if (SCM_IMP (arg1)) | |
4085 | args = arg1; | |
4086 | else | |
4087 | { | |
4088 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
05b15362 | 4089 | for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4090 | { |
05b15362 | 4091 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4092 | tl = SCM_CDR (tl); |
4093 | } | |
4094 | SCM_SETCDR (tl, arg1); | |
4095 | } | |
4096 | ||
821f18a4 DH |
4097 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4098 | args, | |
4099 | SCM_ENV (proc)); | |
f9450cdb | 4100 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4101 | again: |
05b15362 DH |
4102 | arg1 = SCM_CDR (proc); |
4103 | while (!SCM_NULLP (arg1)) | |
2ddb0920 MD |
4104 | { |
4105 | if (SCM_IMP (SCM_CAR (proc))) | |
4106 | { | |
4107 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4108 | { | |
28d52ebb | 4109 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4110 | /* check for race condition */ |
4111 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4112 | proc = scm_m_expand_body (proc, args); | |
28d52ebb | 4113 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4114 | goto again; |
2ddb0920 | 4115 | } |
5280aaca | 4116 | else |
17fa3fcf | 4117 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4118 | } |
4119 | else | |
e791c18f MD |
4120 | SCM_CEVAL (SCM_CAR (proc), args); |
4121 | proc = arg1; | |
05b15362 | 4122 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4123 | } |
e791c18f | 4124 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4125 | case scm_tc7_smob: |
68b06924 | 4126 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4127 | goto badproc; |
afa38f6e | 4128 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4129 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
afa38f6e | 4130 | else if (SCM_NULLP (args)) |
ddea3325 | 4131 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
0717dfd8 | 4132 | else if (SCM_NULLP (SCM_CDR (args))) |
ddea3325 | 4133 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4134 | else |
68b06924 | 4135 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4136 | case scm_tc7_cclo: |
4137 | #ifdef DEVAL | |
6dbd0af5 MD |
4138 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4139 | arg1 = proc; | |
4140 | proc = SCM_CCLO_SUBR (proc); | |
4141 | debug.vect[0].a.proc = proc; | |
4142 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4143 | #else |
4144 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4145 | arg1 = proc; |
4146 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4147 | #endif |
0f2d19dd | 4148 | goto tail; |
89efbff4 MD |
4149 | case scm_tc7_pws: |
4150 | proc = SCM_PROCEDURE (proc); | |
4151 | #ifdef DEVAL | |
4152 | debug.vect[0].a.proc = proc; | |
4153 | #endif | |
4154 | goto tail; | |
904a077d | 4155 | case scm_tcs_struct: |
f3d2630a MD |
4156 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4157 | { | |
4158 | #ifdef DEVAL | |
4159 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4160 | #else | |
4161 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4162 | #endif | |
195847fa | 4163 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4164 | } |
2ca0d207 | 4165 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4166 | { |
504d99c5 | 4167 | /* operator */ |
da7f71d7 MD |
4168 | #ifdef DEVAL |
4169 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4170 | #else | |
4171 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4172 | #endif | |
4173 | arg1 = proc; | |
195847fa MD |
4174 | proc = (SCM_I_ENTITYP (proc) |
4175 | ? SCM_ENTITY_PROCEDURE (proc) | |
4176 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4177 | #ifdef DEVAL |
4178 | debug.vect[0].a.proc = proc; | |
4179 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4180 | #endif | |
195847fa MD |
4181 | if (SCM_NIMP (proc)) |
4182 | goto tail; | |
4183 | else | |
4184 | goto badproc; | |
da7f71d7 | 4185 | } |
2ca0d207 DH |
4186 | else |
4187 | goto badproc; | |
0f2d19dd JB |
4188 | default: |
4189 | badproc: | |
db4b4ca6 | 4190 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
4191 | } |
4192 | #ifdef DEVAL | |
6dbd0af5 | 4193 | exit: |
5132eef0 | 4194 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4195 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4196 | { |
b7ff98dd MD |
4197 | SCM_CLEAR_TRACED_FRAME (debug); |
4198 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 4199 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4200 | else |
4201 | { | |
5f144b10 GH |
4202 | int first; |
4203 | SCM val = scm_make_continuation (&first); | |
4204 | ||
4205 | if (first) | |
4206 | arg1 = val; | |
4207 | else | |
6dbd0af5 | 4208 | { |
5f144b10 | 4209 | proc = val; |
6dbd0af5 MD |
4210 | goto ret; |
4211 | } | |
4212 | } | |
d95c0b76 NJ |
4213 | SCM_TRAPS_P = 0; |
4214 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
4215 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4216 | } |
4217 | ret: | |
1646d37b | 4218 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4219 | return proc; |
4220 | #endif | |
4221 | } | |
4222 | ||
6dbd0af5 MD |
4223 | |
4224 | /* SECTION: The rest of this file is only read once. | |
4225 | */ | |
4226 | ||
0f2d19dd JB |
4227 | #ifndef DEVAL |
4228 | ||
504d99c5 MD |
4229 | /* Trampolines |
4230 | * | |
4231 | * Trampolines make it possible to move procedure application dispatch | |
4232 | * outside inner loops. The motivation was clean implementation of | |
4233 | * efficient replacements of R5RS primitives in SRFI-1. | |
4234 | * | |
4235 | * The semantics is clear: scm_trampoline_N returns an optimized | |
4236 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
4237 | * on N args). | |
4238 | * | |
4239 | * Applying the optimization to map and for-each increased efficiency | |
4240 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
4241 | * before. | |
4242 | */ | |
4243 | ||
756414cf MD |
4244 | static SCM |
4245 | call_subr0_0 (SCM proc) | |
4246 | { | |
4247 | return SCM_SUBRF (proc) (); | |
4248 | } | |
4249 | ||
4250 | static SCM | |
4251 | call_subr1o_0 (SCM proc) | |
4252 | { | |
4253 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
4254 | } | |
4255 | ||
4256 | static SCM | |
4257 | call_lsubr_0 (SCM proc) | |
4258 | { | |
4259 | return SCM_SUBRF (proc) (SCM_EOL); | |
4260 | } | |
4261 | ||
4262 | SCM | |
4263 | scm_i_call_closure_0 (SCM proc) | |
4264 | { | |
6a3f13f0 DH |
4265 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4266 | SCM_EOL, | |
4267 | SCM_ENV (proc)); | |
4268 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4269 | return result; |
756414cf MD |
4270 | } |
4271 | ||
4272 | scm_t_trampoline_0 | |
4273 | scm_trampoline_0 (SCM proc) | |
4274 | { | |
4275 | if (SCM_IMP (proc)) | |
d0b07b5d | 4276 | return NULL; |
756414cf MD |
4277 | if (SCM_DEBUGGINGP) |
4278 | return scm_call_0; | |
4279 | switch (SCM_TYP7 (proc)) | |
4280 | { | |
4281 | case scm_tc7_subr_0: | |
4282 | return call_subr0_0; | |
4283 | case scm_tc7_subr_1o: | |
4284 | return call_subr1o_0; | |
4285 | case scm_tc7_lsubr: | |
4286 | return call_lsubr_0; | |
4287 | case scm_tcs_closures: | |
4288 | { | |
4289 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b | 4290 | if (SCM_NULLP (formals) || !SCM_CONSP (formals)) |
756414cf MD |
4291 | return scm_i_call_closure_0; |
4292 | else | |
d0b07b5d | 4293 | return NULL; |
756414cf MD |
4294 | } |
4295 | case scm_tcs_struct: | |
4296 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4297 | return scm_call_generic_0; | |
2ca0d207 DH |
4298 | else if (SCM_I_OPERATORP (proc)) |
4299 | return scm_call_0; | |
4300 | return NULL; | |
756414cf MD |
4301 | case scm_tc7_smob: |
4302 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
4303 | return SCM_SMOB_DESCRIPTOR (proc).apply_0; | |
4304 | else | |
d0b07b5d | 4305 | return NULL; |
756414cf MD |
4306 | case scm_tc7_asubr: |
4307 | case scm_tc7_rpsubr: | |
4308 | case scm_tc7_cclo: | |
4309 | case scm_tc7_pws: | |
4310 | return scm_call_0; | |
4311 | default: | |
d0b07b5d | 4312 | return NULL; /* not applicable on one arg */ |
756414cf MD |
4313 | } |
4314 | } | |
4315 | ||
504d99c5 MD |
4316 | static SCM |
4317 | call_subr1_1 (SCM proc, SCM arg1) | |
4318 | { | |
4319 | return SCM_SUBRF (proc) (arg1); | |
4320 | } | |
4321 | ||
9ed24633 MD |
4322 | static SCM |
4323 | call_subr2o_1 (SCM proc, SCM arg1) | |
4324 | { | |
4325 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
4326 | } | |
4327 | ||
504d99c5 MD |
4328 | static SCM |
4329 | call_lsubr_1 (SCM proc, SCM arg1) | |
4330 | { | |
4331 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
4332 | } | |
4333 | ||
4334 | static SCM | |
4335 | call_dsubr_1 (SCM proc, SCM arg1) | |
4336 | { | |
4337 | if (SCM_INUMP (arg1)) | |
4338 | { | |
4339 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4340 | } | |
4341 | else if (SCM_REALP (arg1)) | |
4342 | { | |
4343 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4344 | } | |
504d99c5 MD |
4345 | else if (SCM_BIGP (arg1)) |
4346 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
504d99c5 MD |
4347 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4348 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4349 | } | |
4350 | ||
4351 | static SCM | |
4352 | call_cxr_1 (SCM proc, SCM arg1) | |
4353 | { | |
14b18ed6 DH |
4354 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4355 | do | |
4356 | { | |
4357 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4358 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4359 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4360 | pattern >>= 2; | |
4361 | } while (pattern); | |
4362 | return arg1; | |
504d99c5 MD |
4363 | } |
4364 | ||
4365 | static SCM | |
4366 | call_closure_1 (SCM proc, SCM arg1) | |
4367 | { | |
6a3f13f0 DH |
4368 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4369 | scm_list_1 (arg1), | |
4370 | SCM_ENV (proc)); | |
4371 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4372 | return result; |
504d99c5 MD |
4373 | } |
4374 | ||
4375 | scm_t_trampoline_1 | |
4376 | scm_trampoline_1 (SCM proc) | |
4377 | { | |
4378 | if (SCM_IMP (proc)) | |
d0b07b5d | 4379 | return NULL; |
504d99c5 MD |
4380 | if (SCM_DEBUGGINGP) |
4381 | return scm_call_1; | |
4382 | switch (SCM_TYP7 (proc)) | |
4383 | { | |
4384 | case scm_tc7_subr_1: | |
4385 | case scm_tc7_subr_1o: | |
4386 | return call_subr1_1; | |
9ed24633 MD |
4387 | case scm_tc7_subr_2o: |
4388 | return call_subr2o_1; | |
504d99c5 MD |
4389 | case scm_tc7_lsubr: |
4390 | return call_lsubr_1; | |
14b18ed6 DH |
4391 | case scm_tc7_dsubr: |
4392 | return call_dsubr_1; | |
504d99c5 | 4393 | case scm_tc7_cxr: |
14b18ed6 | 4394 | return call_cxr_1; |
504d99c5 MD |
4395 | case scm_tcs_closures: |
4396 | { | |
4397 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4398 | if (!SCM_NULLP (formals) |
4399 | && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals)))) | |
504d99c5 MD |
4400 | return call_closure_1; |
4401 | else | |
d0b07b5d | 4402 | return NULL; |
504d99c5 MD |
4403 | } |
4404 | case scm_tcs_struct: | |
4405 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4406 | return scm_call_generic_1; | |
2ca0d207 DH |
4407 | else if (SCM_I_OPERATORP (proc)) |
4408 | return scm_call_1; | |
4409 | return NULL; | |
504d99c5 MD |
4410 | case scm_tc7_smob: |
4411 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
4412 | return SCM_SMOB_DESCRIPTOR (proc).apply_1; | |
4413 | else | |
d0b07b5d | 4414 | return NULL; |
504d99c5 MD |
4415 | case scm_tc7_asubr: |
4416 | case scm_tc7_rpsubr: | |
4417 | case scm_tc7_cclo: | |
4418 | case scm_tc7_pws: | |
4419 | return scm_call_1; | |
4420 | default: | |
d0b07b5d | 4421 | return NULL; /* not applicable on one arg */ |
504d99c5 MD |
4422 | } |
4423 | } | |
4424 | ||
4425 | static SCM | |
4426 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4427 | { | |
4428 | return SCM_SUBRF (proc) (arg1, arg2); | |
4429 | } | |
4430 | ||
9ed24633 MD |
4431 | static SCM |
4432 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4433 | { | |
4434 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
4435 | } | |
4436 | ||
504d99c5 MD |
4437 | static SCM |
4438 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
4439 | { | |
4440 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
4441 | } | |
4442 | ||
4443 | static SCM | |
4444 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
4445 | { | |
6a3f13f0 DH |
4446 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4447 | scm_list_2 (arg1, arg2), | |
4448 | SCM_ENV (proc)); | |
4449 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4450 | return result; |
504d99c5 MD |
4451 | } |
4452 | ||
4453 | scm_t_trampoline_2 | |
4454 | scm_trampoline_2 (SCM proc) | |
4455 | { | |
4456 | if (SCM_IMP (proc)) | |
d0b07b5d | 4457 | return NULL; |
504d99c5 MD |
4458 | if (SCM_DEBUGGINGP) |
4459 | return scm_call_2; | |
4460 | switch (SCM_TYP7 (proc)) | |
4461 | { | |
4462 | case scm_tc7_subr_2: | |
4463 | case scm_tc7_subr_2o: | |
4464 | case scm_tc7_rpsubr: | |
4465 | case scm_tc7_asubr: | |
4466 | return call_subr2_2; | |
9ed24633 MD |
4467 | case scm_tc7_lsubr_2: |
4468 | return call_lsubr2_2; | |
504d99c5 MD |
4469 | case scm_tc7_lsubr: |
4470 | return call_lsubr_2; | |
4471 | case scm_tcs_closures: | |
4472 | { | |
4473 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4474 | if (!SCM_NULLP (formals) |
4475 | && (!SCM_CONSP (formals) | |
4476 | || (!SCM_NULLP (SCM_CDR (formals)) | |
4477 | && (!SCM_CONSP (SCM_CDR (formals)) | |
4478 | || !SCM_CONSP (SCM_CDDR (formals)))))) | |
504d99c5 MD |
4479 | return call_closure_2; |
4480 | else | |
d0b07b5d | 4481 | return NULL; |
504d99c5 MD |
4482 | } |
4483 | case scm_tcs_struct: | |
4484 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4485 | return scm_call_generic_2; | |
2ca0d207 DH |
4486 | else if (SCM_I_OPERATORP (proc)) |
4487 | return scm_call_2; | |
4488 | return NULL; | |
504d99c5 MD |
4489 | case scm_tc7_smob: |
4490 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
4491 | return SCM_SMOB_DESCRIPTOR (proc).apply_2; | |
4492 | else | |
d0b07b5d | 4493 | return NULL; |
504d99c5 MD |
4494 | case scm_tc7_cclo: |
4495 | case scm_tc7_pws: | |
4496 | return scm_call_2; | |
4497 | default: | |
d0b07b5d | 4498 | return NULL; /* not applicable on two args */ |
504d99c5 MD |
4499 | } |
4500 | } | |
4501 | ||
d9c393f5 JB |
4502 | /* Typechecking for multi-argument MAP and FOR-EACH. |
4503 | ||
47c3f06d | 4504 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 4505 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 4506 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 4507 | static inline void |
47c3f06d | 4508 | check_map_args (SCM argv, |
c014a02e | 4509 | long len, |
47c3f06d MD |
4510 | SCM gf, |
4511 | SCM proc, | |
4512 | SCM args, | |
4513 | const char *who) | |
d9c393f5 | 4514 | { |
34d19ef6 | 4515 | SCM const *ve = SCM_VELTS (argv); |
c014a02e | 4516 | long i; |
d9c393f5 | 4517 | |
b5c2579a | 4518 | for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 4519 | { |
c014a02e | 4520 | long elt_len = scm_ilength (ve[i]); |
d9c393f5 JB |
4521 | |
4522 | if (elt_len < 0) | |
47c3f06d MD |
4523 | { |
4524 | if (gf) | |
4525 | scm_apply_generic (gf, scm_cons (proc, args)); | |
4526 | else | |
4527 | scm_wrong_type_arg (who, i + 2, ve[i]); | |
4528 | } | |
d9c393f5 JB |
4529 | |
4530 | if (elt_len != len) | |
504d99c5 | 4531 | scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2)); |
d9c393f5 JB |
4532 | } |
4533 | ||
5d2b97cd | 4534 | scm_remember_upto_here_1 (argv); |
d9c393f5 JB |
4535 | } |
4536 | ||
4537 | ||
47c3f06d | 4538 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 4539 | |
368bf056 MD |
4540 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
4541 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 4542 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 4543 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 4544 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
4545 | */ |
4546 | ||
0f2d19dd | 4547 | SCM |
1bbd0b84 | 4548 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 4549 | #define FUNC_NAME s_map |
0f2d19dd | 4550 | { |
c014a02e | 4551 | long i, len; |
0f2d19dd JB |
4552 | SCM res = SCM_EOL; |
4553 | SCM *pres = &res; | |
34d19ef6 | 4554 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
0f2d19dd | 4555 | |
d9c393f5 | 4556 | len = scm_ilength (arg1); |
47c3f06d MD |
4557 | SCM_GASSERTn (len >= 0, |
4558 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 4559 | SCM_VALIDATE_REST_ARGUMENT (args); |
0f2d19dd JB |
4560 | if (SCM_NULLP (args)) |
4561 | { | |
504d99c5 MD |
4562 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
4563 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
4564 | while (SCM_NIMP (arg1)) | |
4565 | { | |
4566 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
4567 | pres = SCM_CDRLOC (*pres); | |
4568 | arg1 = SCM_CDR (arg1); | |
4569 | } | |
4570 | return res; | |
4571 | } | |
4572 | if (SCM_NULLP (SCM_CDR (args))) | |
4573 | { | |
4574 | SCM arg2 = SCM_CAR (args); | |
4575 | int len2 = scm_ilength (arg2); | |
4576 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
4577 | SCM_GASSERTn (call, | |
4578 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
4579 | SCM_GASSERTn (len2 >= 0, | |
4580 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
4581 | if (len2 != len) | |
4582 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
4583 | while (SCM_NIMP (arg1)) |
4584 | { | |
504d99c5 | 4585 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 4586 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 4587 | arg1 = SCM_CDR (arg1); |
504d99c5 | 4588 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
4589 | } |
4590 | return res; | |
4591 | } | |
05b15362 DH |
4592 | arg1 = scm_cons (arg1, args); |
4593 | args = scm_vector (arg1); | |
0f2d19dd | 4594 | ve = SCM_VELTS (args); |
47c3f06d | 4595 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
4596 | while (1) |
4597 | { | |
4598 | arg1 = SCM_EOL; | |
b5c2579a | 4599 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 4600 | { |
d9c393f5 JB |
4601 | if (SCM_IMP (ve[i])) |
4602 | return res; | |
0f2d19dd | 4603 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 4604 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd | 4605 | } |
8ea46249 | 4606 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 4607 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
4608 | } |
4609 | } | |
af45e3b0 | 4610 | #undef FUNC_NAME |
0f2d19dd JB |
4611 | |
4612 | ||
47c3f06d | 4613 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 4614 | |
0f2d19dd | 4615 | SCM |
1bbd0b84 | 4616 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 4617 | #define FUNC_NAME s_for_each |
0f2d19dd | 4618 | { |
34d19ef6 | 4619 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
c014a02e | 4620 | long i, len; |
d9c393f5 | 4621 | len = scm_ilength (arg1); |
47c3f06d MD |
4622 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
4623 | SCM_ARG2, s_for_each); | |
af45e3b0 | 4624 | SCM_VALIDATE_REST_ARGUMENT (args); |
c96d76b8 | 4625 | if (SCM_NULLP (args)) |
0f2d19dd | 4626 | { |
504d99c5 MD |
4627 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
4628 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
4629 | while (SCM_NIMP (arg1)) | |
4630 | { | |
4631 | call (proc, SCM_CAR (arg1)); | |
4632 | arg1 = SCM_CDR (arg1); | |
4633 | } | |
4634 | return SCM_UNSPECIFIED; | |
4635 | } | |
4636 | if (SCM_NULLP (SCM_CDR (args))) | |
4637 | { | |
4638 | SCM arg2 = SCM_CAR (args); | |
4639 | int len2 = scm_ilength (arg2); | |
4640 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
4641 | SCM_GASSERTn (call, g_for_each, | |
4642 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
4643 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
4644 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
4645 | if (len2 != len) | |
4646 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 4647 | while (SCM_NIMP (arg1)) |
0f2d19dd | 4648 | { |
504d99c5 | 4649 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 4650 | arg1 = SCM_CDR (arg1); |
504d99c5 | 4651 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
4652 | } |
4653 | return SCM_UNSPECIFIED; | |
4654 | } | |
05b15362 DH |
4655 | arg1 = scm_cons (arg1, args); |
4656 | args = scm_vector (arg1); | |
0f2d19dd | 4657 | ve = SCM_VELTS (args); |
47c3f06d | 4658 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
4659 | while (1) |
4660 | { | |
4661 | arg1 = SCM_EOL; | |
b5c2579a | 4662 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 4663 | { |
c96d76b8 NJ |
4664 | if (SCM_IMP (ve[i])) |
4665 | return SCM_UNSPECIFIED; | |
0f2d19dd | 4666 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 4667 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd JB |
4668 | } |
4669 | scm_apply (proc, arg1, SCM_EOL); | |
4670 | } | |
4671 | } | |
af45e3b0 | 4672 | #undef FUNC_NAME |
0f2d19dd | 4673 | |
1cc91f1b | 4674 | |
0f2d19dd | 4675 | SCM |
6e8d25a6 | 4676 | scm_closure (SCM code, SCM env) |
0f2d19dd | 4677 | { |
16d4699b MV |
4678 | SCM z; |
4679 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 4680 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 4681 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
4682 | return z; |
4683 | } | |
4684 | ||
4685 | ||
92c2555f | 4686 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 4687 | |
0f2d19dd | 4688 | SCM |
6e8d25a6 | 4689 | scm_makprom (SCM code) |
0f2d19dd | 4690 | { |
28d52ebb MD |
4691 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
4692 | SCM_UNPACK (code), | |
4693 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
4694 | } |
4695 | ||
28d52ebb MD |
4696 | static size_t |
4697 | promise_free (SCM promise) | |
4698 | { | |
4699 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
4700 | return 0; | |
4701 | } | |
1cc91f1b | 4702 | |
0f2d19dd | 4703 | static int |
e841c3e0 | 4704 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 4705 | { |
19402679 | 4706 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 4707 | scm_puts ("#<promise ", port); |
19402679 | 4708 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 4709 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 4710 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 4711 | scm_putc ('>', port); |
0f2d19dd JB |
4712 | return !0; |
4713 | } | |
4714 | ||
3b3b36dd | 4715 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 4716 | (SCM promise), |
67e8151b MG |
4717 | "If the promise @var{x} has not been computed yet, compute and\n" |
4718 | "return @var{x}, otherwise just return the previously computed\n" | |
4719 | "value.") | |
1bbd0b84 | 4720 | #define FUNC_NAME s_scm_force |
0f2d19dd | 4721 | { |
28d52ebb MD |
4722 | SCM_VALIDATE_SMOB (1, promise, promise); |
4723 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
4724 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 4725 | { |
28d52ebb MD |
4726 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
4727 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 4728 | { |
28d52ebb MD |
4729 | SCM_SET_PROMISE_DATA (promise, ans); |
4730 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
4731 | } |
4732 | } | |
28d52ebb MD |
4733 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
4734 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 4735 | } |
1bbd0b84 | 4736 | #undef FUNC_NAME |
0f2d19dd | 4737 | |
445f675c | 4738 | |
a1ec6916 | 4739 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 4740 | (SCM obj), |
b380b885 | 4741 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 4742 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 4743 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 4744 | { |
67e8151b | 4745 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 4746 | } |
1bbd0b84 | 4747 | #undef FUNC_NAME |
0f2d19dd | 4748 | |
445f675c | 4749 | |
a1ec6916 | 4750 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 4751 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
4752 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
4753 | "Any source properties associated with @var{xorig} are also associated\n" | |
4754 | "with the new pair.") | |
1bbd0b84 | 4755 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
4756 | { |
4757 | SCM p, z; | |
16d4699b | 4758 | z = scm_cons (x, y); |
26d5b9b4 MD |
4759 | /* Copy source properties possibly associated with xorig. */ |
4760 | p = scm_whash_lookup (scm_source_whash, xorig); | |
445f675c | 4761 | if (!SCM_IMP (p)) |
26d5b9b4 MD |
4762 | scm_whash_insert (scm_source_whash, z, p); |
4763 | return z; | |
4764 | } | |
1bbd0b84 | 4765 | #undef FUNC_NAME |
26d5b9b4 | 4766 | |
445f675c | 4767 | |
a1ec6916 | 4768 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 4769 | (SCM obj), |
b380b885 MD |
4770 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
4771 | "pointer to the new data structure. @code{copy-tree} recurses down the\n" | |
4772 | "contents of both pairs and vectors (since both cons cells and vector\n" | |
4773 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
4774 | "any other object.") | |
1bbd0b84 | 4775 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd JB |
4776 | { |
4777 | SCM ans, tl; | |
26d5b9b4 | 4778 | if (SCM_IMP (obj)) |
ff467021 | 4779 | return obj; |
3910272e MD |
4780 | if (SCM_VECTORP (obj)) |
4781 | { | |
c014a02e | 4782 | unsigned long i = SCM_VECTOR_LENGTH (obj); |
00ffa0e7 | 4783 | ans = scm_c_make_vector (i, SCM_UNSPECIFIED); |
3910272e | 4784 | while (i--) |
34d19ef6 | 4785 | SCM_VECTOR_SET (ans, i, scm_copy_tree (SCM_VELTS (obj)[i])); |
3910272e MD |
4786 | return ans; |
4787 | } | |
01f11e02 | 4788 | if (!SCM_CONSP (obj)) |
0f2d19dd | 4789 | return obj; |
26d5b9b4 MD |
4790 | ans = tl = scm_cons_source (obj, |
4791 | scm_copy_tree (SCM_CAR (obj)), | |
4792 | SCM_UNSPECIFIED); | |
05b15362 | 4793 | for (obj = SCM_CDR (obj); SCM_CONSP (obj); obj = SCM_CDR (obj)) |
a23afe53 MD |
4794 | { |
4795 | SCM_SETCDR (tl, scm_cons (scm_copy_tree (SCM_CAR (obj)), | |
4796 | SCM_UNSPECIFIED)); | |
4797 | tl = SCM_CDR (tl); | |
4798 | } | |
4799 | SCM_SETCDR (tl, obj); | |
0f2d19dd JB |
4800 | return ans; |
4801 | } | |
1bbd0b84 | 4802 | #undef FUNC_NAME |
0f2d19dd | 4803 | |
1cc91f1b | 4804 | |
4163eb72 MV |
4805 | /* We have three levels of EVAL here: |
4806 | ||
4807 | - scm_i_eval (exp, env) | |
4808 | ||
4809 | evaluates EXP in environment ENV. ENV is a lexical environment | |
4810 | structure as used by the actual tree code evaluator. When ENV is | |
4811 | a top-level environment, then changes to the current module are | |
a513ead3 | 4812 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
4813 | the current module. |
4814 | ||
4815 | - scm_primitive_eval (exp) | |
4816 | ||
4817 | evaluates EXP in the top-level environment as determined by the | |
4818 | current module. This is done by constructing a suitable | |
4819 | environment and calling scm_i_eval. Thus, changes to the | |
4820 | top-level module are tracked normally. | |
4821 | ||
4822 | - scm_eval (exp, mod) | |
4823 | ||
a513ead3 | 4824 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
4825 | setting the current module to MOD, invoking scm_primitive_eval on |
4826 | EXP, and then restoring the current module to the value it had | |
4827 | previously. That is, while EXP is evaluated, changes to the | |
4828 | current module are tracked, but these changes do not persist when | |
4829 | scm_eval returns. | |
4830 | ||
4831 | For each level of evals, there are two variants, distinguished by a | |
4832 | _x suffix: the ordinary variant does not modify EXP while the _x | |
4833 | variant can destructively modify EXP into something completely | |
4834 | unintelligible. A Scheme data structure passed as EXP to one of the | |
4835 | _x variants should not ever be used again for anything. So when in | |
4836 | doubt, use the ordinary variant. | |
4837 | ||
4838 | */ | |
4839 | ||
0f2d19dd | 4840 | SCM |
68d8be66 | 4841 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 4842 | { |
68d8be66 | 4843 | return SCM_XEVAL (exp, env); |
0f2d19dd JB |
4844 | } |
4845 | ||
68d8be66 MD |
4846 | SCM |
4847 | scm_i_eval (SCM exp, SCM env) | |
4848 | { | |
26fb6390 | 4849 | exp = scm_copy_tree (exp); |
e37a4fba | 4850 | return SCM_XEVAL (exp, env); |
68d8be66 MD |
4851 | } |
4852 | ||
4853 | SCM | |
4163eb72 | 4854 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 4855 | { |
a513ead3 | 4856 | SCM env; |
bcdab802 | 4857 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 4858 | if (SCM_NIMP (transformer)) |
fdc28395 | 4859 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 4860 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 4861 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
4862 | } |
4863 | ||
4163eb72 MV |
4864 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
4865 | (SCM exp), | |
2069af38 | 4866 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
4867 | "the current module.") |
4868 | #define FUNC_NAME s_scm_primitive_eval | |
4869 | { | |
a513ead3 | 4870 | SCM env; |
bcdab802 | 4871 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 4872 | if (SCM_NIMP (transformer)) |
fdc28395 | 4873 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 4874 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
4875 | return scm_i_eval (exp, env); |
4876 | } | |
4877 | #undef FUNC_NAME | |
4878 | ||
68d8be66 MD |
4879 | /* Eval does not take the second arg optionally. This is intentional |
4880 | * in order to be R5RS compatible, and to prepare for the new module | |
4881 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 4882 | * environment explicit. */ |
549e6ec6 | 4883 | |
09074dbf DH |
4884 | static void |
4885 | change_environment (void *data) | |
4886 | { | |
4887 | SCM pair = SCM_PACK (data); | |
4888 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 4889 | SCM old_module = scm_current_module (); |
09074dbf | 4890 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 4891 | scm_set_current_module (new_module); |
09074dbf DH |
4892 | } |
4893 | ||
4894 | ||
09074dbf DH |
4895 | static void |
4896 | restore_environment (void *data) | |
4897 | { | |
4898 | SCM pair = SCM_PACK (data); | |
4899 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 4900 | SCM new_module = scm_current_module (); |
2e9c835d | 4901 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 4902 | scm_set_current_module (old_module); |
09074dbf DH |
4903 | } |
4904 | ||
4163eb72 MV |
4905 | static SCM |
4906 | inner_eval_x (void *data) | |
4907 | { | |
4908 | return scm_primitive_eval_x (SCM_PACK(data)); | |
4909 | } | |
4910 | ||
4911 | SCM | |
4912 | scm_eval_x (SCM exp, SCM module) | |
4913 | #define FUNC_NAME "eval!" | |
4914 | { | |
4915 | SCM_VALIDATE_MODULE (2, module); | |
4916 | ||
4917 | return scm_internal_dynamic_wind | |
4918 | (change_environment, inner_eval_x, restore_environment, | |
4919 | (void *) SCM_UNPACK (exp), | |
4920 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
4921 | } | |
4922 | #undef FUNC_NAME | |
4923 | ||
4924 | static SCM | |
4925 | inner_eval (void *data) | |
4926 | { | |
4927 | return scm_primitive_eval (SCM_PACK(data)); | |
4928 | } | |
09074dbf | 4929 | |
68d8be66 | 4930 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
4931 | (SCM exp, SCM module), |
4932 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
4933 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 4934 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
4935 | "@var{module} is made the current module. The current module\n" |
4936 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 4937 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 4938 | { |
4163eb72 | 4939 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
4940 | |
4941 | return scm_internal_dynamic_wind | |
4942 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
4943 | (void *) SCM_UNPACK (exp), |
4944 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 4945 | } |
1bbd0b84 | 4946 | #undef FUNC_NAME |
0f2d19dd | 4947 | |
6dbd0af5 MD |
4948 | |
4949 | /* At this point, scm_deval and scm_dapply are generated. | |
4950 | */ | |
4951 | ||
a44a9715 DH |
4952 | #define DEVAL |
4953 | #include "eval.c" | |
0f2d19dd | 4954 | |
1cc91f1b | 4955 | |
0f2d19dd JB |
4956 | void |
4957 | scm_init_eval () | |
0f2d19dd | 4958 | { |
33b97402 MD |
4959 | scm_init_opts (scm_evaluator_traps, |
4960 | scm_evaluator_trap_table, | |
4961 | SCM_N_EVALUATOR_TRAPS); | |
4962 | scm_init_opts (scm_eval_options_interface, | |
4963 | scm_eval_opts, | |
4964 | SCM_N_EVAL_OPTIONS); | |
4965 | ||
f99c9c28 MD |
4966 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
4967 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 4968 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 4969 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 4970 | |
a44a9715 DH |
4971 | undefineds = scm_list_1 (SCM_UNDEFINED); |
4972 | SCM_SETCDR (undefineds, undefineds); | |
4973 | scm_permanent_object (undefineds); | |
7c33806a | 4974 | |
a44a9715 | 4975 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 4976 | |
a44a9715 DH |
4977 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
4978 | scm_permanent_object (f_apply); | |
86d31dfe | 4979 | |
a0599745 | 4980 | #include "libguile/eval.x" |
86d31dfe | 4981 | |
25eaf21a | 4982 | scm_add_feature ("delay"); |
0f2d19dd | 4983 | } |
0f2d19dd | 4984 | |
6dbd0af5 | 4985 | #endif /* !DEVAL */ |
89e00824 ML |
4986 | |
4987 | /* | |
4988 | Local Variables: | |
4989 | c-file-style: "gnu" | |
4990 | End: | |
4991 | */ |