Commit | Line | Data |
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2b829bbb | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006 |
434f2f7a | 2 | * Free Software Foundation, Inc. |
0f2d19dd | 3 | * |
73be1d9e MV |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 8 | * |
73be1d9e MV |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
0f2d19dd | 13 | * |
73be1d9e MV |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software | |
92205699 | 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 17 | */ |
1bbd0b84 | 18 | |
0f2d19dd JB |
19 | \f |
20 | ||
de527efb MV |
21 | #define _GNU_SOURCE |
22 | ||
434f2f7a DH |
23 | /* This file is read twice in order to produce debugging versions of ceval and |
24 | * scm_apply. These functions, deval and scm_dapply, are produced when we | |
25 | * define the preprocessor macro DEVAL. The file is divided into sections | |
26 | * which are treated differently with respect to DEVAL. The heads of these | |
27 | * sections are marked with the string "SECTION:". */ | |
6dbd0af5 | 28 | |
6dbd0af5 | 29 | /* SECTION: This code is compiled once. |
0f2d19dd JB |
30 | */ |
31 | ||
3d05f2e0 RB |
32 | #if HAVE_CONFIG_H |
33 | # include <config.h> | |
34 | #endif | |
0f2d19dd | 35 | |
3d05f2e0 RB |
36 | #include "libguile/__scm.h" |
37 | ||
38 | #ifndef DEVAL | |
d16332b3 | 39 | |
8ab3d8a0 KR |
40 | /* This blob per the Autoconf manual (under "Particular Functions"). */ |
41 | #if HAVE_ALLOCA_H | |
42 | # include <alloca.h> | |
43 | #elif defined __GNUC__ | |
44 | # define alloca __builtin_alloca | |
45 | #elif defined _AIX | |
46 | # define alloca __alloca | |
47 | #elif defined _MSC_VER | |
48 | # include <malloc.h> | |
49 | # define alloca _alloca | |
50 | #else | |
51 | # include <stddef.h> | |
52 | # ifdef __cplusplus | |
53 | extern "C" | |
48b96f4b | 54 | # endif |
8ab3d8a0 | 55 | void *alloca (size_t); |
23f2b9a3 | 56 | #endif |
48b96f4b | 57 | |
e7313a9d | 58 | #include <assert.h> |
a0599745 | 59 | #include "libguile/_scm.h" |
21628685 DH |
60 | #include "libguile/alist.h" |
61 | #include "libguile/async.h" | |
62 | #include "libguile/continuations.h" | |
a0599745 | 63 | #include "libguile/debug.h" |
328dc9a3 | 64 | #include "libguile/deprecation.h" |
09074dbf | 65 | #include "libguile/dynwind.h" |
a0599745 | 66 | #include "libguile/eq.h" |
21628685 DH |
67 | #include "libguile/feature.h" |
68 | #include "libguile/fluids.h" | |
756414cf | 69 | #include "libguile/futures.h" |
21628685 DH |
70 | #include "libguile/goops.h" |
71 | #include "libguile/hash.h" | |
72 | #include "libguile/hashtab.h" | |
73 | #include "libguile/lang.h" | |
4610b011 | 74 | #include "libguile/list.h" |
a0599745 | 75 | #include "libguile/macros.h" |
a0599745 | 76 | #include "libguile/modules.h" |
21628685 | 77 | #include "libguile/objects.h" |
a0599745 | 78 | #include "libguile/ports.h" |
7e6e6b37 | 79 | #include "libguile/print.h" |
21628685 | 80 | #include "libguile/procprop.h" |
a0599745 | 81 | #include "libguile/root.h" |
21628685 DH |
82 | #include "libguile/smob.h" |
83 | #include "libguile/srcprop.h" | |
84 | #include "libguile/stackchk.h" | |
85 | #include "libguile/strings.h" | |
9de87eea | 86 | #include "libguile/threads.h" |
21628685 DH |
87 | #include "libguile/throw.h" |
88 | #include "libguile/validate.h" | |
a513ead3 | 89 | #include "libguile/values.h" |
21628685 | 90 | #include "libguile/vectors.h" |
a0599745 | 91 | |
a0599745 | 92 | #include "libguile/eval.h" |
89efbff4 | 93 | |
0f2d19dd JB |
94 | \f |
95 | ||
212e58ed | 96 | static SCM unmemoize_exprs (SCM expr, SCM env); |
0f572ba7 | 97 | static SCM canonicalize_define (SCM expr); |
e5156567 | 98 | static SCM *scm_lookupcar1 (SCM vloc, SCM genv, int check); |
212e58ed | 99 | static SCM unmemoize_builtin_macro (SCM expr, SCM env); |
5defc05d | 100 | static void eval_letrec_inits (SCM env, SCM init_forms, SCM **init_values_eol); |
0f572ba7 DH |
101 | |
102 | \f | |
103 | ||
e6729603 DH |
104 | /* {Syntax Errors} |
105 | * | |
106 | * This section defines the message strings for the syntax errors that can be | |
107 | * detected during memoization and the functions and macros that shall be | |
108 | * called by the memoizer code to signal syntax errors. */ | |
109 | ||
110 | ||
111 | /* Syntax errors that can be detected during memoization: */ | |
112 | ||
113 | /* Circular or improper lists do not form valid scheme expressions. If a | |
114 | * circular list or an improper list is detected in a place where a scheme | |
115 | * expression is expected, a 'Bad expression' error is signalled. */ | |
116 | static const char s_bad_expression[] = "Bad expression"; | |
117 | ||
89bff2fc DH |
118 | /* If a form is detected that holds a different number of expressions than are |
119 | * required in that context, a 'Missing or extra expression' error is | |
120 | * signalled. */ | |
121 | static const char s_expression[] = "Missing or extra expression in"; | |
122 | ||
cc56ba80 | 123 | /* If a form is detected that holds less expressions than are required in that |
8ae95199 | 124 | * context, a 'Missing expression' error is signalled. */ |
cc56ba80 DH |
125 | static const char s_missing_expression[] = "Missing expression in"; |
126 | ||
609a8b86 | 127 | /* If a form is detected that holds more expressions than are allowed in that |
8ae95199 | 128 | * context, an 'Extra expression' error is signalled. */ |
609a8b86 DH |
129 | static const char s_extra_expression[] = "Extra expression in"; |
130 | ||
89bff2fc DH |
131 | /* The empty combination '()' is not allowed as an expression in scheme. If |
132 | * it is detected in a place where an expression is expected, an 'Illegal | |
133 | * empty combination' error is signalled. Note: If you encounter this error | |
134 | * message, it is very likely that you intended to denote the empty list. To | |
135 | * do so, you need to quote the empty list like (quote ()) or '(). */ | |
136 | static const char s_empty_combination[] = "Illegal empty combination"; | |
137 | ||
c86c440b DH |
138 | /* A body may hold an arbitrary number of internal defines, followed by a |
139 | * non-empty sequence of expressions. If a body with an empty sequence of | |
140 | * expressions is detected, a 'Missing body expression' error is signalled. | |
141 | */ | |
142 | static const char s_missing_body_expression[] = "Missing body expression in"; | |
143 | ||
144 | /* A body may hold an arbitrary number of internal defines, followed by a | |
145 | * non-empty sequence of expressions. Each the definitions and the | |
146 | * expressions may be grouped arbitraryly with begin, but it is not allowed to | |
147 | * mix definitions and expressions. If a define form in a body mixes | |
148 | * definitions and expressions, a 'Mixed definitions and expressions' error is | |
6bff1368 | 149 | * signalled. */ |
c86c440b | 150 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; |
6bff1368 DH |
151 | /* Definitions are only allowed on the top level and at the start of a body. |
152 | * If a definition is detected anywhere else, a 'Bad define placement' error | |
153 | * is signalled. */ | |
154 | static const char s_bad_define[] = "Bad define placement"; | |
c86c440b | 155 | |
2a6f7afe DH |
156 | /* Case or cond expressions must have at least one clause. If a case or cond |
157 | * expression without any clauses is detected, a 'Missing clauses' error is | |
158 | * signalled. */ | |
159 | static const char s_missing_clauses[] = "Missing clauses"; | |
160 | ||
609a8b86 DH |
161 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
162 | * last clause. If after the 'else' case clause further clauses are detected, | |
163 | * a 'Misplaced else clause' error is signalled. */ | |
164 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
165 | ||
2a6f7afe DH |
166 | /* If a case clause is detected that is not in the format |
167 | * (<label(s)> <expression1> <expression2> ...) | |
168 | * a 'Bad case clause' error is signalled. */ | |
169 | static const char s_bad_case_clause[] = "Bad case clause"; | |
170 | ||
2a6f7afe DH |
171 | /* If a case clause is detected where the <label(s)> element is neither a |
172 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
173 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
174 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
175 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
176 | * local or global environment, it is not considered a syntactic keyword, but | |
177 | * will be treated as any other variable. */ | |
178 | static const char s_bad_case_labels[] = "Bad case labels"; | |
179 | ||
180 | /* In a case statement all labels have to be distinct. If in a case statement | |
181 | * a label occurs more than once, a 'Duplicate case label' error is | |
182 | * signalled. */ | |
183 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
184 | ||
609a8b86 DH |
185 | /* If a cond clause is detected that is not in one of the formats |
186 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
187 | * a 'Bad cond clause' error is signalled. */ | |
188 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
189 | ||
190 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
191 | * not hold a recipient element for the test result, a 'Missing recipient' | |
192 | * error is signalled. */ | |
193 | static const char s_missing_recipient[] = "Missing recipient in"; | |
194 | ||
cc56ba80 DH |
195 | /* If in a position where a variable name is required some other object is |
196 | * detected, a 'Bad variable' error is signalled. */ | |
197 | static const char s_bad_variable[] = "Bad variable"; | |
198 | ||
a954ce1d DH |
199 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
200 | * possibly empty list. If any other object is detected in a place where a | |
201 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
202 | static const char s_bad_bindings[] = "Bad bindings"; | |
203 | ||
204 | /* Depending on the syntactic context, a binding has to be in the format | |
205 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
206 | * If anything else is detected in a place where a binding was expected, a | |
207 | * 'Bad binding' error is signalled. */ | |
208 | static const char s_bad_binding[] = "Bad binding"; | |
209 | ||
4610b011 DH |
210 | /* Some syntactic forms don't allow variable names to appear more than once in |
211 | * a list of bindings. If such a situation is nevertheless detected, a | |
212 | * 'Duplicate binding' error is signalled. */ | |
213 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
214 | ||
a954ce1d DH |
215 | /* If the exit form of a 'do' expression is not in the format |
216 | * (<test> <expression> ...) | |
217 | * a 'Bad exit clause' error is signalled. */ | |
218 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
219 | ||
03a3e941 DH |
220 | /* The formal function arguments of a lambda expression have to be either a |
221 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
222 | * error is signalled. */ | |
223 | static const char s_bad_formals[] = "Bad formals"; | |
224 | ||
225 | /* If in a lambda expression something else than a symbol is detected at a | |
226 | * place where a formal function argument is required, a 'Bad formal' error is | |
227 | * signalled. */ | |
228 | static const char s_bad_formal[] = "Bad formal"; | |
229 | ||
230 | /* If in the arguments list of a lambda expression an argument name occurs | |
231 | * more than once, a 'Duplicate formal' error is signalled. */ | |
232 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
233 | ||
6f81708a DH |
234 | /* If the evaluation of an unquote-splicing expression gives something else |
235 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
236 | * signalled. */ | |
237 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
238 | ||
9a848baf DH |
239 | /* If something else than an exact integer is detected as the argument for |
240 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
241 | static const char s_bad_slot_number[] = "Bad slot number"; | |
242 | ||
e6729603 DH |
243 | |
244 | /* Signal a syntax error. We distinguish between the form that caused the | |
245 | * error and the enclosing expression. The error message will print out as | |
246 | * shown in the following pattern. The file name and line number are only | |
247 | * given when they can be determined from the erroneous form or from the | |
248 | * enclosing expression. | |
249 | * | |
250 | * <filename>: In procedure memoization: | |
251 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
252 | ||
253 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
254 | ||
255 | /* The prototype is needed to indicate that the function does not return. */ | |
256 | static void | |
257 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
258 | ||
259 | static void | |
260 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
261 | { | |
cc95e00a | 262 | SCM msg_string = scm_from_locale_string (msg); |
e6729603 DH |
263 | SCM filename = SCM_BOOL_F; |
264 | SCM linenr = SCM_BOOL_F; | |
265 | const char *format; | |
266 | SCM args; | |
267 | ||
a61f4e0c | 268 | if (scm_is_pair (form)) |
e6729603 DH |
269 | { |
270 | filename = scm_source_property (form, scm_sym_filename); | |
271 | linenr = scm_source_property (form, scm_sym_line); | |
272 | } | |
273 | ||
a61f4e0c | 274 | if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr)) |
e6729603 DH |
275 | { |
276 | filename = scm_source_property (expr, scm_sym_filename); | |
277 | linenr = scm_source_property (expr, scm_sym_line); | |
278 | } | |
279 | ||
280 | if (!SCM_UNBNDP (expr)) | |
281 | { | |
7888309b | 282 | if (scm_is_true (filename)) |
e6729603 DH |
283 | { |
284 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
285 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
286 | } | |
7888309b | 287 | else if (scm_is_true (linenr)) |
e6729603 DH |
288 | { |
289 | format = "In line ~S: ~A ~S in expression ~S."; | |
290 | args = scm_list_4 (linenr, msg_string, form, expr); | |
291 | } | |
292 | else | |
293 | { | |
294 | format = "~A ~S in expression ~S."; | |
295 | args = scm_list_3 (msg_string, form, expr); | |
296 | } | |
297 | } | |
298 | else | |
299 | { | |
7888309b | 300 | if (scm_is_true (filename)) |
e6729603 DH |
301 | { |
302 | format = "In file ~S, line ~S: ~A ~S."; | |
303 | args = scm_list_4 (filename, linenr, msg_string, form); | |
304 | } | |
7888309b | 305 | else if (scm_is_true (linenr)) |
e6729603 DH |
306 | { |
307 | format = "In line ~S: ~A ~S."; | |
308 | args = scm_list_3 (linenr, msg_string, form); | |
309 | } | |
310 | else | |
311 | { | |
312 | format = "~A ~S."; | |
313 | args = scm_list_2 (msg_string, form); | |
314 | } | |
315 | } | |
316 | ||
317 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
318 | } | |
319 | ||
320 | ||
321 | /* Shortcut macros to simplify syntax error handling. */ | |
322 | #define ASSERT_SYNTAX(cond, message, form) \ | |
323 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
324 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
325 | { if (!(cond)) syntax_error (message, form, expr); } | |
326 | ||
327 | \f | |
328 | ||
d0624e39 DH |
329 | /* {Ilocs} |
330 | * | |
331 | * Ilocs are memoized references to variables in local environment frames. | |
332 | * They are represented as three values: The relative offset of the | |
333 | * environment frame, the number of the binding within that frame, and a | |
334 | * boolean value indicating whether the binding is the last binding in the | |
335 | * frame. | |
a55c2b68 MV |
336 | * |
337 | * Frame numbers have 11 bits, relative offsets have 12 bits. | |
d0624e39 | 338 | */ |
7e6e6b37 | 339 | |
d0624e39 | 340 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) |
7e6e6b37 DH |
341 | #define SCM_IFRINC (0x00000100L) |
342 | #define SCM_ICDR (0x00080000L) | |
d0624e39 | 343 | #define SCM_IDINC (0x00100000L) |
7e6e6b37 DH |
344 | #define SCM_IFRAME(n) ((long)((SCM_ICDR-SCM_IFRINC)>>8) \ |
345 | & (SCM_UNPACK (n) >> 8)) | |
346 | #define SCM_IDIST(n) (SCM_UNPACK (n) >> 20) | |
347 | #define SCM_ICDRP(n) (SCM_ICDR & SCM_UNPACK (n)) | |
d0624e39 | 348 | #define SCM_IDSTMSK (-SCM_IDINC) |
a55c2b68 MV |
349 | #define SCM_IFRAMEMAX ((1<<11)-1) |
350 | #define SCM_IDISTMAX ((1<<12)-1) | |
d0624e39 DH |
351 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ |
352 | SCM_PACK ( \ | |
353 | ((frame_nr) << 8) \ | |
354 | + ((binding_nr) << 20) \ | |
355 | + ((last_p) ? SCM_ICDR : 0) \ | |
356 | + scm_tc8_iloc ) | |
357 | ||
7e6e6b37 DH |
358 | void |
359 | scm_i_print_iloc (SCM iloc, SCM port) | |
360 | { | |
361 | scm_puts ("#@", port); | |
362 | scm_intprint ((long) SCM_IFRAME (iloc), 10, port); | |
363 | scm_putc (SCM_ICDRP (iloc) ? '-' : '+', port); | |
364 | scm_intprint ((long) SCM_IDIST (iloc), 10, port); | |
365 | } | |
366 | ||
d0624e39 DH |
367 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) |
368 | ||
369 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
90df793f | 370 | |
d0624e39 DH |
371 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, |
372 | (SCM frame, SCM binding, SCM cdrp), | |
373 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
374 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
375 | #define FUNC_NAME s_scm_dbg_make_iloc | |
376 | { | |
c3c97a34 KR |
377 | return SCM_MAKE_ILOC ((scm_t_bits) scm_to_unsigned_integer (frame, 0, SCM_IFRAMEMAX), |
378 | (scm_t_bits) scm_to_unsigned_integer (binding, 0, SCM_IDISTMAX), | |
7888309b | 379 | scm_is_true (cdrp)); |
d0624e39 DH |
380 | } |
381 | #undef FUNC_NAME | |
382 | ||
383 | SCM scm_dbg_iloc_p (SCM obj); | |
90df793f | 384 | |
d0624e39 DH |
385 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, |
386 | (SCM obj), | |
387 | "Return @code{#t} if @var{obj} is an iloc.") | |
388 | #define FUNC_NAME s_scm_dbg_iloc_p | |
389 | { | |
7888309b | 390 | return scm_from_bool (SCM_ILOCP (obj)); |
d0624e39 DH |
391 | } |
392 | #undef FUNC_NAME | |
393 | ||
394 | #endif | |
395 | ||
396 | \f | |
397 | ||
7e6e6b37 DH |
398 | /* {Evaluator byte codes (isyms)} |
399 | */ | |
400 | ||
401 | #define ISYMNUM(n) (SCM_ITAG8_DATA (n)) | |
402 | ||
403 | /* This table must agree with the list of SCM_IM_ constants in tags.h */ | |
404 | static const char *const isymnames[] = | |
405 | { | |
406 | "#@and", | |
407 | "#@begin", | |
408 | "#@case", | |
409 | "#@cond", | |
410 | "#@do", | |
411 | "#@if", | |
412 | "#@lambda", | |
413 | "#@let", | |
414 | "#@let*", | |
415 | "#@letrec", | |
416 | "#@or", | |
417 | "#@quote", | |
418 | "#@set!", | |
419 | "#@define", | |
420 | "#@apply", | |
421 | "#@call-with-current-continuation", | |
422 | "#@dispatch", | |
423 | "#@slot-ref", | |
424 | "#@slot-set!", | |
425 | "#@delay", | |
426 | "#@future", | |
427 | "#@call-with-values", | |
428 | "#@else", | |
429 | "#@arrow", | |
430 | "#@nil-cond", | |
431 | "#@bind" | |
432 | }; | |
433 | ||
434 | void | |
435 | scm_i_print_isym (SCM isym, SCM port) | |
436 | { | |
437 | const size_t isymnum = ISYMNUM (isym); | |
438 | if (isymnum < (sizeof isymnames / sizeof (char *))) | |
439 | scm_puts (isymnames[isymnum], port); | |
440 | else | |
441 | scm_ipruk ("isym", isym, port); | |
442 | } | |
443 | ||
444 | \f | |
445 | ||
e5156567 DH |
446 | /* The function lookup_symbol is used during memoization: Lookup the symbol in |
447 | * the environment. If there is no binding for the symbol, SCM_UNDEFINED is | |
57d23e25 DH |
448 | * returned. If the symbol is a global variable, the variable object to which |
449 | * the symbol is bound is returned. Finally, if the symbol is a local | |
450 | * variable the corresponding iloc object is returned. */ | |
6f81708a DH |
451 | |
452 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
453 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
57d23e25 DH |
454 | * is unbound and it returns a variable object if the symbol is a global |
455 | * variable. */ | |
6f81708a DH |
456 | static SCM |
457 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
458 | { | |
459 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
7888309b | 460 | if (scm_is_false (variable)) |
57d23e25 | 461 | return SCM_UNDEFINED; |
6f81708a | 462 | else |
57d23e25 | 463 | return variable; |
6f81708a DH |
464 | } |
465 | ||
466 | static SCM | |
467 | lookup_symbol (const SCM symbol, const SCM env) | |
468 | { | |
469 | SCM frame_idx; | |
470 | unsigned int frame_nr; | |
471 | ||
472 | for (frame_idx = env, frame_nr = 0; | |
a61f4e0c | 473 | !scm_is_null (frame_idx); |
6f81708a DH |
474 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) |
475 | { | |
476 | const SCM frame = SCM_CAR (frame_idx); | |
a61f4e0c | 477 | if (scm_is_pair (frame)) |
6f81708a DH |
478 | { |
479 | /* frame holds a local environment frame */ | |
480 | SCM symbol_idx; | |
481 | unsigned int symbol_nr; | |
482 | ||
483 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
a61f4e0c | 484 | scm_is_pair (symbol_idx); |
6f81708a DH |
485 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) |
486 | { | |
bc36d050 | 487 | if (scm_is_eq (SCM_CAR (symbol_idx), symbol)) |
6f81708a DH |
488 | /* found the symbol, therefore return the iloc */ |
489 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
490 | } | |
bc36d050 | 491 | if (scm_is_eq (symbol_idx, symbol)) |
6f81708a DH |
492 | /* found the symbol as the last element of the current frame */ |
493 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
494 | } | |
495 | else | |
496 | { | |
497 | /* no more local environment frames */ | |
498 | return lookup_global_symbol (symbol, frame); | |
499 | } | |
500 | } | |
501 | ||
502 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
503 | } | |
504 | ||
505 | ||
506 | /* Return true if the symbol is - from the point of view of a macro | |
507 | * transformer - a literal in the sense specified in chapter "pattern | |
508 | * language" of R5RS. In the code below, however, we don't match the | |
509 | * definition of R5RS exactly: It returns true if the identifier has no | |
510 | * binding or if it is a syntactic keyword. */ | |
511 | static int | |
512 | literal_p (const SCM symbol, const SCM env) | |
513 | { | |
57d23e25 DH |
514 | const SCM variable = lookup_symbol (symbol, env); |
515 | if (SCM_UNBNDP (variable)) | |
516 | return 1; | |
517 | if (SCM_VARIABLEP (variable) && SCM_MACROP (SCM_VARIABLE_REF (variable))) | |
6f81708a DH |
518 | return 1; |
519 | else | |
520 | return 0; | |
521 | } | |
17fa3fcf | 522 | |
5fb64383 DH |
523 | |
524 | /* Return true if the expression is self-quoting in the memoized code. Thus, | |
525 | * some other objects (like e. g. vectors) are reported as self-quoting, which | |
526 | * according to R5RS would need to be quoted. */ | |
527 | static int | |
528 | is_self_quoting_p (const SCM expr) | |
529 | { | |
a61f4e0c | 530 | if (scm_is_pair (expr)) |
5fb64383 | 531 | return 0; |
cc95e00a | 532 | else if (scm_is_symbol (expr)) |
5fb64383 | 533 | return 0; |
a61f4e0c | 534 | else if (scm_is_null (expr)) |
5fb64383 DH |
535 | return 0; |
536 | else return 1; | |
537 | } | |
538 | ||
0f2d19dd | 539 | |
212e58ed DH |
540 | SCM_SYMBOL (sym_three_question_marks, "???"); |
541 | ||
542 | static SCM | |
543 | unmemoize_expression (const SCM expr, const SCM env) | |
544 | { | |
545 | if (SCM_ILOCP (expr)) | |
546 | { | |
547 | SCM frame_idx; | |
548 | unsigned long int frame_nr; | |
549 | SCM symbol_idx; | |
550 | unsigned long int symbol_nr; | |
551 | ||
552 | for (frame_idx = env, frame_nr = SCM_IFRAME (expr); | |
553 | frame_nr != 0; | |
554 | frame_idx = SCM_CDR (frame_idx), --frame_nr) | |
555 | ; | |
556 | for (symbol_idx = SCM_CAAR (frame_idx), symbol_nr = SCM_IDIST (expr); | |
557 | symbol_nr != 0; | |
558 | symbol_idx = SCM_CDR (symbol_idx), --symbol_nr) | |
559 | ; | |
560 | return SCM_ICDRP (expr) ? symbol_idx : SCM_CAR (symbol_idx); | |
561 | } | |
562 | else if (SCM_VARIABLEP (expr)) | |
563 | { | |
564 | const SCM sym = scm_module_reverse_lookup (scm_env_module (env), expr); | |
7888309b | 565 | return scm_is_true (sym) ? sym : sym_three_question_marks; |
212e58ed | 566 | } |
4057a3e0 | 567 | else if (scm_is_simple_vector (expr)) |
212e58ed DH |
568 | { |
569 | return scm_list_2 (scm_sym_quote, expr); | |
570 | } | |
a61f4e0c | 571 | else if (!scm_is_pair (expr)) |
212e58ed DH |
572 | { |
573 | return expr; | |
574 | } | |
575 | else if (SCM_ISYMP (SCM_CAR (expr))) | |
576 | { | |
577 | return unmemoize_builtin_macro (expr, env); | |
578 | } | |
579 | else | |
580 | { | |
581 | return unmemoize_exprs (expr, env); | |
582 | } | |
583 | } | |
584 | ||
585 | ||
586 | static SCM | |
587 | unmemoize_exprs (const SCM exprs, const SCM env) | |
588 | { | |
90df793f | 589 | SCM r_result = SCM_EOL; |
9fcf3cbb | 590 | SCM expr_idx = exprs; |
90df793f DH |
591 | SCM um_expr; |
592 | ||
593 | /* Note that due to the current lazy memoizer we may find partially memoized | |
5fa0939c | 594 | * code during execution. In such code we have to expect improper lists of |
90df793f DH |
595 | * expressions: On the one hand, for such code syntax checks have not yet |
596 | * fully been performed, on the other hand, there may be even legal code | |
597 | * like '(a . b) appear as an improper list of expressions as long as the | |
598 | * quote expression is still in its unmemoized form. For this reason, the | |
599 | * following code handles improper lists of expressions until memoization | |
600 | * and execution have been completely separated. */ | |
a61f4e0c | 601 | for (; scm_is_pair (expr_idx); expr_idx = SCM_CDR (expr_idx)) |
212e58ed DH |
602 | { |
603 | const SCM expr = SCM_CAR (expr_idx); | |
5fa0939c DH |
604 | |
605 | /* In partially memoized code, lists of expressions that stem from a | |
606 | * body form may start with an ISYM if the body itself has not yet been | |
607 | * memoized. This isym is just an internal marker to indicate that the | |
608 | * body still needs to be memoized. An isym may occur at the very | |
609 | * beginning of the body or after one or more comment strings. It is | |
610 | * dropped during unmemoization. */ | |
611 | if (!SCM_ISYMP (expr)) | |
612 | { | |
613 | um_expr = unmemoize_expression (expr, env); | |
614 | r_result = scm_cons (um_expr, r_result); | |
615 | } | |
90df793f DH |
616 | } |
617 | um_expr = unmemoize_expression (expr_idx, env); | |
a61f4e0c | 618 | if (!scm_is_null (r_result)) |
90df793f DH |
619 | { |
620 | const SCM result = scm_reverse_x (r_result, SCM_UNDEFINED); | |
621 | SCM_SETCDR (r_result, um_expr); | |
622 | return result; | |
623 | } | |
624 | else | |
625 | { | |
626 | return um_expr; | |
212e58ed | 627 | } |
212e58ed DH |
628 | } |
629 | ||
630 | ||
34adf7ea DH |
631 | /* Rewrite the body (which is given as the list of expressions forming the |
632 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
633 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
634 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
635 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 636 | * SCM_IM_LET, etc. |
34adf7ea DH |
637 | * |
638 | * It is assumed that the calling expression has already made sure that the | |
639 | * body is a proper list. */ | |
26d5b9b4 | 640 | static SCM |
430b8401 | 641 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 642 | { |
26d5b9b4 | 643 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
644 | if (SCM_ISYMP (SCM_CAR (exprs))) |
645 | return exprs; | |
646 | else | |
647 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
648 | } |
649 | ||
1cc91f1b | 650 | |
57d23e25 DH |
651 | /* The function m_expand_body memoizes a proper list of expressions forming a |
652 | * body. This function takes care of dealing with internal defines and | |
653 | * transforming them into an equivalent letrec expression. The list of | |
654 | * expressions is rewritten in place. */ | |
910b5125 | 655 | |
57d23e25 DH |
656 | /* This is a helper function for m_expand_body. If the argument expression is |
657 | * a symbol that denotes a syntactic keyword, the corresponding macro object | |
658 | * is returned, in all other cases the function returns SCM_UNDEFINED. */ | |
910b5125 DH |
659 | static SCM |
660 | try_macro_lookup (const SCM expr, const SCM env) | |
661 | { | |
cc95e00a | 662 | if (scm_is_symbol (expr)) |
910b5125 | 663 | { |
57d23e25 DH |
664 | const SCM variable = lookup_symbol (expr, env); |
665 | if (SCM_VARIABLEP (variable)) | |
666 | { | |
667 | const SCM value = SCM_VARIABLE_REF (variable); | |
668 | if (SCM_MACROP (value)) | |
669 | return value; | |
670 | } | |
910b5125 | 671 | } |
57d23e25 DH |
672 | |
673 | return SCM_UNDEFINED; | |
910b5125 DH |
674 | } |
675 | ||
676 | /* This is a helper function for m_expand_body. It expands user macros, | |
677 | * because for the correct translation of a body we need to know whether they | |
678 | * expand to a definition. */ | |
679 | static SCM | |
680 | expand_user_macros (SCM expr, const SCM env) | |
681 | { | |
a61f4e0c | 682 | while (scm_is_pair (expr)) |
910b5125 DH |
683 | { |
684 | const SCM car_expr = SCM_CAR (expr); | |
685 | const SCM new_car = expand_user_macros (car_expr, env); | |
686 | const SCM value = try_macro_lookup (new_car, env); | |
687 | ||
688 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
689 | { | |
690 | /* User macros transform code into code. */ | |
691 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
692 | /* We need to reiterate on the transformed code. */ | |
693 | } | |
694 | else | |
695 | { | |
696 | /* No user macro: return. */ | |
697 | SCM_SETCAR (expr, new_car); | |
698 | return expr; | |
699 | } | |
700 | } | |
701 | ||
702 | return expr; | |
703 | } | |
704 | ||
705 | /* This is a helper function for m_expand_body. It determines if a given form | |
706 | * represents an application of a given built-in macro. The built-in macro to | |
707 | * check for is identified by its syntactic keyword. The form is an | |
708 | * application of the given macro if looking up the car of the form in the | |
709 | * given environment actually returns the built-in macro. */ | |
710 | static int | |
711 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
712 | { | |
a61f4e0c | 713 | if (scm_is_pair (form)) |
910b5125 DH |
714 | { |
715 | const SCM car_form = SCM_CAR (form); | |
716 | const SCM value = try_macro_lookup (car_form, env); | |
717 | if (SCM_BUILTIN_MACRO_P (value)) | |
718 | { | |
719 | const SCM macro_name = scm_macro_name (value); | |
bc36d050 | 720 | return scm_is_eq (macro_name, syntactic_keyword); |
910b5125 DH |
721 | } |
722 | } | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
9d4bf6d3 | 727 | static void |
910b5125 DH |
728 | m_expand_body (const SCM forms, const SCM env) |
729 | { | |
730 | /* The first body form can be skipped since it is known to be the ISYM that | |
731 | * was prepended to the body by m_body. */ | |
732 | SCM cdr_forms = SCM_CDR (forms); | |
733 | SCM form_idx = cdr_forms; | |
734 | SCM definitions = SCM_EOL; | |
735 | SCM sequence = SCM_EOL; | |
736 | ||
737 | /* According to R5RS, the list of body forms consists of two parts: a number | |
738 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
739 | * expressions. Each the definitions and the expressions may be grouped | |
740 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
741 | * expressions. The task of the following loop therefore is to split the | |
742 | * list of body forms into the list of definitions and the sequence of | |
743 | * expressions. */ | |
a61f4e0c | 744 | while (!scm_is_null (form_idx)) |
910b5125 DH |
745 | { |
746 | const SCM form = SCM_CAR (form_idx); | |
747 | const SCM new_form = expand_user_macros (form, env); | |
748 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
749 | { | |
750 | definitions = scm_cons (new_form, definitions); | |
751 | form_idx = SCM_CDR (form_idx); | |
752 | } | |
753 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
754 | { | |
755 | /* We have encountered a group of forms. This has to be either a | |
756 | * (possibly empty) group of (possibly further grouped) definitions, | |
757 | * or a non-empty group of (possibly further grouped) | |
758 | * expressions. */ | |
759 | const SCM grouped_forms = SCM_CDR (new_form); | |
760 | unsigned int found_definition = 0; | |
761 | unsigned int found_expression = 0; | |
762 | SCM grouped_form_idx = grouped_forms; | |
a61f4e0c | 763 | while (!found_expression && !scm_is_null (grouped_form_idx)) |
910b5125 DH |
764 | { |
765 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
766 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
767 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
768 | { | |
769 | found_definition = 1; | |
770 | definitions = scm_cons (new_inner_form, definitions); | |
771 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
772 | } | |
773 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
774 | { | |
775 | const SCM inner_group = SCM_CDR (new_inner_form); | |
776 | grouped_form_idx | |
777 | = scm_append (scm_list_2 (inner_group, | |
778 | SCM_CDR (grouped_form_idx))); | |
779 | } | |
780 | else | |
781 | { | |
782 | /* The group marks the start of the expressions of the body. | |
783 | * We have to make sure that within the same group we have | |
784 | * not encountered a definition before. */ | |
785 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
786 | found_expression = 1; | |
787 | grouped_form_idx = SCM_EOL; | |
788 | } | |
789 | } | |
790 | ||
791 | /* We have finished processing the group. If we have not yet | |
792 | * encountered an expression we continue processing the forms of the | |
793 | * body to collect further definition forms. Otherwise, the group | |
794 | * marks the start of the sequence of expressions of the body. */ | |
795 | if (!found_expression) | |
796 | { | |
797 | form_idx = SCM_CDR (form_idx); | |
798 | } | |
799 | else | |
800 | { | |
801 | sequence = form_idx; | |
802 | form_idx = SCM_EOL; | |
803 | } | |
804 | } | |
805 | else | |
806 | { | |
807 | /* We have detected a form which is no definition. This marks the | |
808 | * start of the sequence of expressions of the body. */ | |
809 | sequence = form_idx; | |
810 | form_idx = SCM_EOL; | |
811 | } | |
812 | } | |
813 | ||
814 | /* FIXME: forms does not hold information about the file location. */ | |
a61f4e0c | 815 | ASSERT_SYNTAX (scm_is_pair (sequence), s_missing_body_expression, cdr_forms); |
910b5125 | 816 | |
a61f4e0c | 817 | if (!scm_is_null (definitions)) |
910b5125 DH |
818 | { |
819 | SCM definition_idx; | |
820 | SCM letrec_tail; | |
821 | SCM letrec_expression; | |
822 | SCM new_letrec_expression; | |
910b5125 DH |
823 | |
824 | SCM bindings = SCM_EOL; | |
825 | for (definition_idx = definitions; | |
a61f4e0c | 826 | !scm_is_null (definition_idx); |
910b5125 DH |
827 | definition_idx = SCM_CDR (definition_idx)) |
828 | { | |
829 | const SCM definition = SCM_CAR (definition_idx); | |
830 | const SCM canonical_definition = canonicalize_define (definition); | |
831 | const SCM binding = SCM_CDR (canonical_definition); | |
832 | bindings = scm_cons (binding, bindings); | |
833 | }; | |
834 | ||
835 | letrec_tail = scm_cons (bindings, sequence); | |
836 | /* FIXME: forms does not hold information about the file location. */ | |
837 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
838 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
839 | SCM_SETCAR (forms, new_letrec_expression); |
840 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
841 | } |
842 | else | |
843 | { | |
844 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
845 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
846 | } |
847 | } | |
848 | ||
2b189e65 MV |
849 | static SCM |
850 | macroexp (SCM x, SCM env) | |
851 | { | |
852 | SCM res, proc, orig_sym; | |
853 | ||
854 | /* Don't bother to produce error messages here. We get them when we | |
855 | eventually execute the code for real. */ | |
856 | ||
857 | macro_tail: | |
858 | orig_sym = SCM_CAR (x); | |
cc95e00a | 859 | if (!scm_is_symbol (orig_sym)) |
2b189e65 MV |
860 | return x; |
861 | ||
862 | { | |
863 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
864 | if (proc_ptr == NULL) | |
865 | { | |
866 | /* We have lost the race. */ | |
867 | goto macro_tail; | |
868 | } | |
869 | proc = *proc_ptr; | |
870 | } | |
871 | ||
872 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
873 | special forms and should not be evaluated here. */ | |
874 | ||
875 | if (!SCM_MACROP (proc) | |
876 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
877 | return x; | |
878 | ||
879 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ | |
880 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); | |
881 | ||
882 | if (scm_ilength (res) <= 0) | |
883 | res = scm_list_2 (SCM_IM_BEGIN, res); | |
2b0fb0a5 NJ |
884 | |
885 | /* njrev: Several queries here: (1) I don't see how it can be | |
886 | correct that the SCM_SETCAR 2 lines below this comment needs | |
887 | protection, but the SCM_SETCAR 6 lines above does not, so | |
888 | something here is probably wrong. (2) macroexp() is now only | |
889 | used in one place - scm_m_generalized_set_x - whereas all other | |
890 | macro expansion happens through expand_user_macros. Therefore | |
891 | (2.1) perhaps macroexp() could be eliminated completely now? | |
892 | (2.2) Does expand_user_macros need any critical section | |
893 | protection? */ | |
894 | ||
9de87eea | 895 | SCM_CRITICAL_SECTION_START; |
2b189e65 MV |
896 | SCM_SETCAR (x, SCM_CAR (res)); |
897 | SCM_SETCDR (x, SCM_CDR (res)); | |
9de87eea | 898 | SCM_CRITICAL_SECTION_END; |
2b189e65 MV |
899 | |
900 | goto macro_tail; | |
901 | } | |
910b5125 | 902 | |
9fbee57e | 903 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
904 | |
905 | ||
3b88ed2a | 906 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 907 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 908 | |
8ea46249 | 909 | SCM |
e6729603 | 910 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 911 | { |
e6729603 DH |
912 | const SCM cdr_expr = SCM_CDR (expr); |
913 | const long length = scm_ilength (cdr_expr); | |
914 | ||
915 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
916 | ||
917 | if (length == 0) | |
918 | { | |
919 | /* Special case: (and) is replaced by #t. */ | |
920 | return SCM_BOOL_T; | |
921 | } | |
0f2d19dd | 922 | else |
e6729603 DH |
923 | { |
924 | SCM_SETCAR (expr, SCM_IM_AND); | |
925 | return expr; | |
926 | } | |
0f2d19dd JB |
927 | } |
928 | ||
212e58ed DH |
929 | static SCM |
930 | unmemoize_and (const SCM expr, const SCM env) | |
931 | { | |
932 | return scm_cons (scm_sym_and, unmemoize_exprs (SCM_CDR (expr), env)); | |
933 | } | |
934 | ||
1cc91f1b | 935 | |
3b88ed2a | 936 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 937 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
938 | |
939 | SCM | |
2a6f7afe | 940 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 941 | { |
2a6f7afe | 942 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
943 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
944 | * That means, there should be a distinction between uses of begin where an | |
945 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
946 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
947 | ||
948 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
949 | return expr; | |
0f2d19dd JB |
950 | } |
951 | ||
212e58ed DH |
952 | static SCM |
953 | unmemoize_begin (const SCM expr, const SCM env) | |
954 | { | |
955 | return scm_cons (scm_sym_begin, unmemoize_exprs (SCM_CDR (expr), env)); | |
956 | } | |
957 | ||
0f2d19dd | 958 | |
3b88ed2a | 959 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 960 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 961 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 962 | |
8ea46249 | 963 | SCM |
2a6f7afe | 964 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 965 | { |
8ea46249 | 966 | SCM clauses; |
2a6f7afe DH |
967 | SCM all_labels = SCM_EOL; |
968 | ||
969 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
970 | const int else_literal_p = literal_p (scm_sym_else, env); | |
971 | ||
972 | const SCM cdr_expr = SCM_CDR (expr); | |
973 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
974 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
975 | ||
976 | clauses = SCM_CDR (cdr_expr); | |
a61f4e0c | 977 | while (!scm_is_null (clauses)) |
0f2d19dd | 978 | { |
2a6f7afe DH |
979 | SCM labels; |
980 | ||
981 | const SCM clause = SCM_CAR (clauses); | |
982 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
983 | s_bad_case_clause, clause, expr); | |
984 | ||
985 | labels = SCM_CAR (clause); | |
a61f4e0c | 986 | if (scm_is_pair (labels)) |
2a6f7afe DH |
987 | { |
988 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
989 | s_bad_case_labels, labels, expr); | |
26ecfa39 | 990 | all_labels = scm_append (scm_list_2 (labels, all_labels)); |
2a6f7afe | 991 | } |
a61f4e0c | 992 | else if (scm_is_null (labels)) |
58a2510b DH |
993 | { |
994 | /* The list of labels is empty. According to R5RS this is allowed. | |
995 | * It means that the sequence of expressions will never be executed. | |
996 | * Therefore, as an optimization, we could remove the whole | |
997 | * clause. */ | |
998 | } | |
2a6f7afe DH |
999 | else |
1000 | { | |
bc36d050 | 1001 | ASSERT_SYNTAX_2 (scm_is_eq (labels, scm_sym_else) && else_literal_p, |
2a6f7afe | 1002 | s_bad_case_labels, labels, expr); |
a61f4e0c | 1003 | ASSERT_SYNTAX_2 (scm_is_null (SCM_CDR (clauses)), |
609a8b86 | 1004 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
1005 | } |
1006 | ||
1007 | /* build the new clause */ | |
bc36d050 | 1008 | if (scm_is_eq (labels, scm_sym_else)) |
2a6f7afe DH |
1009 | SCM_SETCAR (clause, SCM_IM_ELSE); |
1010 | ||
8ea46249 | 1011 | clauses = SCM_CDR (clauses); |
0f2d19dd | 1012 | } |
2a6f7afe DH |
1013 | |
1014 | /* Check whether all case labels are distinct. */ | |
a61f4e0c | 1015 | for (; !scm_is_null (all_labels); all_labels = SCM_CDR (all_labels)) |
2a6f7afe DH |
1016 | { |
1017 | const SCM label = SCM_CAR (all_labels); | |
7888309b | 1018 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (label, SCM_CDR (all_labels))), |
4610b011 | 1019 | s_duplicate_case_label, label, expr); |
2a6f7afe DH |
1020 | } |
1021 | ||
1022 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1023 | return expr; | |
0f2d19dd JB |
1024 | } |
1025 | ||
212e58ed DH |
1026 | static SCM |
1027 | unmemoize_case (const SCM expr, const SCM env) | |
1028 | { | |
1029 | const SCM um_key_expr = unmemoize_expression (SCM_CADR (expr), env); | |
1030 | SCM um_clauses = SCM_EOL; | |
1031 | SCM clause_idx; | |
1032 | ||
1033 | for (clause_idx = SCM_CDDR (expr); | |
a61f4e0c | 1034 | !scm_is_null (clause_idx); |
212e58ed DH |
1035 | clause_idx = SCM_CDR (clause_idx)) |
1036 | { | |
1037 | const SCM clause = SCM_CAR (clause_idx); | |
1038 | const SCM labels = SCM_CAR (clause); | |
1039 | const SCM exprs = SCM_CDR (clause); | |
1040 | ||
1041 | const SCM um_exprs = unmemoize_exprs (exprs, env); | |
bc36d050 | 1042 | const SCM um_labels = (scm_is_eq (labels, SCM_IM_ELSE)) |
212e58ed DH |
1043 | ? scm_sym_else |
1044 | : scm_i_finite_list_copy (labels); | |
1045 | const SCM um_clause = scm_cons (um_labels, um_exprs); | |
1046 | ||
1047 | um_clauses = scm_cons (um_clause, um_clauses); | |
1048 | } | |
1049 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1050 | ||
1051 | return scm_cons2 (scm_sym_case, um_key_expr, um_clauses); | |
1052 | } | |
1053 | ||
0f2d19dd | 1054 | |
3b88ed2a | 1055 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1056 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1057 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1058 | |
8ea46249 | 1059 | SCM |
609a8b86 | 1060 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1061 | { |
609a8b86 DH |
1062 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1063 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1064 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1065 | ||
1066 | const SCM clauses = SCM_CDR (expr); | |
1067 | SCM clause_idx; | |
1068 | ||
1069 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1070 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1071 | ||
1072 | for (clause_idx = clauses; | |
a61f4e0c | 1073 | !scm_is_null (clause_idx); |
609a8b86 | 1074 | clause_idx = SCM_CDR (clause_idx)) |
0f2d19dd | 1075 | { |
609a8b86 DH |
1076 | SCM test; |
1077 | ||
1078 | const SCM clause = SCM_CAR (clause_idx); | |
1079 | const long length = scm_ilength (clause); | |
1080 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1081 | ||
1082 | test = SCM_CAR (clause); | |
bc36d050 | 1083 | if (scm_is_eq (test, scm_sym_else) && else_literal_p) |
0f2d19dd | 1084 | { |
a61f4e0c | 1085 | const int last_clause_p = scm_is_null (SCM_CDR (clause_idx)); |
609a8b86 DH |
1086 | ASSERT_SYNTAX_2 (length >= 2, |
1087 | s_bad_cond_clause, clause, expr); | |
1088 | ASSERT_SYNTAX_2 (last_clause_p, | |
1089 | s_misplaced_else_clause, clause, expr); | |
1090 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1091 | } |
609a8b86 | 1092 | else if (length >= 2 |
bc36d050 | 1093 | && scm_is_eq (SCM_CADR (clause), scm_sym_arrow) |
609a8b86 DH |
1094 | && arrow_literal_p) |
1095 | { | |
1096 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1097 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1098 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1099 | } |
1fe1fc0a MV |
1100 | /* SRFI 61 extended cond */ |
1101 | else if (length >= 3 | |
1102 | && scm_is_eq (SCM_CADDR (clause), scm_sym_arrow) | |
1103 | && arrow_literal_p) | |
1104 | { | |
1105 | ASSERT_SYNTAX_2 (length > 3, s_missing_recipient, clause, expr); | |
1106 | ASSERT_SYNTAX_2 (length == 4, s_extra_expression, clause, expr); | |
1107 | SCM_SETCAR (SCM_CDDR (clause), SCM_IM_ARROW); | |
1108 | } | |
0f2d19dd | 1109 | } |
609a8b86 DH |
1110 | |
1111 | SCM_SETCAR (expr, SCM_IM_COND); | |
1112 | return expr; | |
0f2d19dd JB |
1113 | } |
1114 | ||
212e58ed DH |
1115 | static SCM |
1116 | unmemoize_cond (const SCM expr, const SCM env) | |
1117 | { | |
1118 | SCM um_clauses = SCM_EOL; | |
1119 | SCM clause_idx; | |
1120 | ||
1121 | for (clause_idx = SCM_CDR (expr); | |
a61f4e0c | 1122 | !scm_is_null (clause_idx); |
212e58ed DH |
1123 | clause_idx = SCM_CDR (clause_idx)) |
1124 | { | |
1125 | const SCM clause = SCM_CAR (clause_idx); | |
1126 | const SCM sequence = SCM_CDR (clause); | |
1127 | const SCM test = SCM_CAR (clause); | |
1128 | SCM um_test; | |
1129 | SCM um_sequence; | |
1130 | SCM um_clause; | |
1131 | ||
bc36d050 | 1132 | if (scm_is_eq (test, SCM_IM_ELSE)) |
212e58ed DH |
1133 | um_test = scm_sym_else; |
1134 | else | |
1135 | um_test = unmemoize_expression (test, env); | |
1136 | ||
a61f4e0c | 1137 | if (!scm_is_null (sequence) && scm_is_eq (SCM_CAR (sequence), |
bc36d050 | 1138 | SCM_IM_ARROW)) |
212e58ed DH |
1139 | { |
1140 | const SCM target = SCM_CADR (sequence); | |
1141 | const SCM um_target = unmemoize_expression (target, env); | |
1142 | um_sequence = scm_list_2 (scm_sym_arrow, um_target); | |
1143 | } | |
1144 | else | |
1145 | { | |
1146 | um_sequence = unmemoize_exprs (sequence, env); | |
1147 | } | |
1148 | ||
1149 | um_clause = scm_cons (um_test, um_sequence); | |
1150 | um_clauses = scm_cons (um_clause, um_clauses); | |
1151 | } | |
1152 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1153 | ||
1154 | return scm_cons (scm_sym_cond, um_clauses); | |
1155 | } | |
1156 | ||
1cc91f1b | 1157 | |
0f572ba7 DH |
1158 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1159 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1160 | |
9fbee57e DH |
1161 | /* Guile provides an extension to R5RS' define syntax to represent function |
1162 | * currying in a compact way. With this extension, it is allowed to write | |
1163 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1164 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1165 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1166 | * should be either a sequence of zero or more variables, or a sequence of one | |
1167 | * or more variables followed by a space-delimited period and another | |
1168 | * variable. Each level of argument nesting wraps the <body> within another | |
1169 | * lambda expression. For example, the following forms are allowed, each one | |
1170 | * followed by an equivalent, more explicit implementation. | |
1171 | * Example 1: | |
1172 | * (define ((a b . c) . d) <body>) is equivalent to | |
1173 | * (define a (lambda (b . c) (lambda d <body>))) | |
1174 | * Example 2: | |
1175 | * (define (((a) b) c . d) <body>) is equivalent to | |
1176 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1177 | */ | |
1178 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1179 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1180 | static SCM |
1181 | canonicalize_define (const SCM expr) | |
5280aaca | 1182 | { |
cc56ba80 DH |
1183 | SCM body; |
1184 | SCM variable; | |
1185 | ||
1186 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1187 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1188 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1189 | ||
1190 | body = SCM_CDR (cdr_expr); | |
1191 | variable = SCM_CAR (cdr_expr); | |
a61f4e0c | 1192 | while (scm_is_pair (variable)) |
5280aaca | 1193 | { |
cc56ba80 DH |
1194 | /* This while loop realizes function currying by variable nesting. |
1195 | * Variable is known to be a nested-variable. In every iteration of the | |
1196 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1197 | * innermost one. Note that we don't check for duplicate formals here: |
1198 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1199 | const SCM formals = SCM_CDR (variable); |
1200 | const SCM tail = scm_cons (formals, body); | |
1201 | ||
1202 | /* Add source properties to each new lambda expression: */ | |
1203 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1204 | ||
1205 | body = scm_list_1 (lambda); | |
1206 | variable = SCM_CAR (variable); | |
5280aaca | 1207 | } |
cc95e00a | 1208 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
cc56ba80 DH |
1209 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); |
1210 | ||
0f572ba7 DH |
1211 | SCM_SETCAR (cdr_expr, variable); |
1212 | SCM_SETCDR (cdr_expr, body); | |
1213 | return expr; | |
1214 | } | |
1215 | ||
36245b66 DH |
1216 | /* According to section 5.2.1 of R5RS we first have to make sure that the |
1217 | * variable is bound, and then perform the (set! variable expression) | |
1218 | * operation. This means, that within the expression we may already assign | |
1219 | * values to variable: (define foo (begin (set! foo 1) (+ foo 1))) */ | |
0f572ba7 DH |
1220 | SCM |
1221 | scm_m_define (SCM expr, SCM env) | |
1222 | { | |
6bff1368 | 1223 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 1224 | |
6bff1368 DH |
1225 | { |
1226 | const SCM canonical_definition = canonicalize_define (expr); | |
1227 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1228 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
36245b66 DH |
1229 | const SCM location |
1230 | = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); | |
1231 | const SCM value = scm_eval_car (SCM_CDR (cdr_canonical_definition), env); | |
6bff1368 | 1232 | |
6bff1368 DH |
1233 | if (SCM_REC_PROCNAMES_P) |
1234 | { | |
1235 | SCM tmp = value; | |
1236 | while (SCM_MACROP (tmp)) | |
1237 | tmp = SCM_MACRO_CODE (tmp); | |
23d72566 | 1238 | if (scm_is_true (scm_procedure_p (tmp)) |
6bff1368 | 1239 | /* Only the first definition determines the name. */ |
7888309b | 1240 | && scm_is_false (scm_procedure_property (tmp, scm_sym_name))) |
6bff1368 DH |
1241 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); |
1242 | } | |
0f572ba7 | 1243 | |
36245b66 | 1244 | SCM_VARIABLE_SET (location, value); |
6bff1368 DH |
1245 | |
1246 | return SCM_UNSPECIFIED; | |
1247 | } | |
0f2d19dd JB |
1248 | } |
1249 | ||
1250 | ||
8ae95199 DH |
1251 | /* This is a helper function for forms (<keyword> <expression>) that are |
1252 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1253 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1254 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1255 | static SCM | |
1256 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1257 | { | |
1258 | const SCM cdr_expr = SCM_CDR (expr); | |
1259 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1260 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1261 | ||
1262 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1263 | ||
1264 | return expr; | |
1265 | } | |
1266 | ||
1267 | ||
3b88ed2a | 1268 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1269 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1270 | |
9fbee57e DH |
1271 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1272 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1273 | * the empty list represents the empty parameter list. This representation | |
1274 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1275 | SCM |
8ae95199 | 1276 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1277 | { |
8ae95199 DH |
1278 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1279 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1280 | return new_expr; | |
0f2d19dd JB |
1281 | } |
1282 | ||
212e58ed DH |
1283 | static SCM |
1284 | unmemoize_delay (const SCM expr, const SCM env) | |
1285 | { | |
1286 | const SCM thunk_expr = SCM_CADDR (expr); | |
1287 | return scm_list_2 (scm_sym_delay, unmemoize_expression (thunk_expr, env)); | |
1288 | } | |
1289 | ||
8ea46249 | 1290 | |
a954ce1d DH |
1291 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1292 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1293 | ||
302c12b4 | 1294 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1295 | * reversed here. During the evaluation this allows for simple consing of the |
1296 | * results of the inits and steps: | |
302c12b4 | 1297 | |
0f2d19dd | 1298 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1299 | (<var2> <init2>) |
1300 | ... ) | |
1301 | (<test> <return>) | |
1302 | <body>) | |
302c12b4 | 1303 | |
0f2d19dd | 1304 | ;; becomes |
302c12b4 | 1305 | |
e681d187 | 1306 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1307 | (varn ... var2 var1) |
1308 | (<test> <return>) | |
1309 | (<body>) | |
1310 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1311 | */ |
0f2d19dd | 1312 | SCM |
a954ce1d | 1313 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1314 | { |
a954ce1d DH |
1315 | SCM variables = SCM_EOL; |
1316 | SCM init_forms = SCM_EOL; | |
1317 | SCM step_forms = SCM_EOL; | |
1318 | SCM binding_idx; | |
1319 | SCM cddr_expr; | |
1320 | SCM exit_clause; | |
1321 | SCM commands; | |
1322 | SCM tail; | |
1323 | ||
1324 | const SCM cdr_expr = SCM_CDR (expr); | |
1325 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1326 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1327 | ||
1328 | /* Collect variables, init and step forms. */ | |
1329 | binding_idx = SCM_CAR (cdr_expr); | |
1330 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1331 | s_bad_bindings, binding_idx, expr); | |
a61f4e0c | 1332 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1333 | { |
a954ce1d DH |
1334 | const SCM binding = SCM_CAR (binding_idx); |
1335 | const long length = scm_ilength (binding); | |
1336 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1337 | s_bad_binding, binding, expr); | |
1338 | ||
302c12b4 | 1339 | { |
a954ce1d DH |
1340 | const SCM name = SCM_CAR (binding); |
1341 | const SCM init = SCM_CADR (binding); | |
1342 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
cc95e00a | 1343 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
7888309b | 1344 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, variables)), |
4610b011 DH |
1345 | s_duplicate_binding, name, expr); |
1346 | ||
a954ce1d DH |
1347 | variables = scm_cons (name, variables); |
1348 | init_forms = scm_cons (init, init_forms); | |
1349 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1350 | } |
0f2d19dd | 1351 | } |
a954ce1d DH |
1352 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1353 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1354 | ||
1355 | /* Memoize the test form and the exit sequence. */ | |
1356 | cddr_expr = SCM_CDR (cdr_expr); | |
1357 | exit_clause = SCM_CAR (cddr_expr); | |
1358 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1359 | s_bad_exit_clause, exit_clause, expr); | |
1360 | ||
1361 | commands = SCM_CDR (cddr_expr); | |
1362 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1363 | tail = scm_cons2 (init_forms, variables, tail); | |
1364 | SCM_SETCAR (expr, SCM_IM_DO); | |
1365 | SCM_SETCDR (expr, tail); | |
1366 | return expr; | |
0f2d19dd JB |
1367 | } |
1368 | ||
212e58ed DH |
1369 | static SCM |
1370 | unmemoize_do (const SCM expr, const SCM env) | |
1371 | { | |
1372 | const SCM cdr_expr = SCM_CDR (expr); | |
1373 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1374 | const SCM rnames = SCM_CAR (cddr_expr); | |
1375 | const SCM extended_env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
1376 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1377 | const SCM exit_sequence = SCM_CAR (cdddr_expr); | |
1378 | const SCM um_exit_sequence = unmemoize_exprs (exit_sequence, extended_env); | |
1379 | const SCM cddddr_expr = SCM_CDR (cdddr_expr); | |
1380 | const SCM um_body = unmemoize_exprs (SCM_CAR (cddddr_expr), extended_env); | |
1381 | ||
1382 | /* build transformed binding list */ | |
1383 | SCM um_names = scm_reverse (rnames); | |
1384 | SCM um_inits = unmemoize_exprs (SCM_CAR (cdr_expr), env); | |
1385 | SCM um_steps = unmemoize_exprs (SCM_CDR (cddddr_expr), extended_env); | |
1386 | SCM um_bindings = SCM_EOL; | |
a61f4e0c | 1387 | while (!scm_is_null (um_names)) |
212e58ed DH |
1388 | { |
1389 | const SCM name = SCM_CAR (um_names); | |
1390 | const SCM init = SCM_CAR (um_inits); | |
1391 | SCM step = SCM_CAR (um_steps); | |
bc36d050 | 1392 | step = scm_is_eq (step, name) ? SCM_EOL : scm_list_1 (step); |
212e58ed DH |
1393 | |
1394 | um_bindings = scm_cons (scm_cons2 (name, init, step), um_bindings); | |
1395 | ||
1396 | um_names = SCM_CDR (um_names); | |
1397 | um_inits = SCM_CDR (um_inits); | |
1398 | um_steps = SCM_CDR (um_steps); | |
1399 | } | |
1400 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); | |
1401 | ||
1402 | return scm_cons (scm_sym_do, | |
1403 | scm_cons2 (um_bindings, um_exit_sequence, um_body)); | |
1404 | } | |
1405 | ||
b8229a3b | 1406 | |
3b88ed2a | 1407 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1408 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1409 | |
9fbee57e | 1410 | SCM |
4610b011 | 1411 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1412 | { |
4610b011 DH |
1413 | const SCM cdr_expr = SCM_CDR (expr); |
1414 | const long length = scm_ilength (cdr_expr); | |
1415 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1416 | SCM_SETCAR (expr, SCM_IM_IF); | |
1417 | return expr; | |
0f2d19dd JB |
1418 | } |
1419 | ||
212e58ed DH |
1420 | static SCM |
1421 | unmemoize_if (const SCM expr, const SCM env) | |
1422 | { | |
1423 | const SCM cdr_expr = SCM_CDR (expr); | |
1424 | const SCM um_condition = unmemoize_expression (SCM_CAR (cdr_expr), env); | |
1425 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1426 | const SCM um_then = unmemoize_expression (SCM_CAR (cddr_expr), env); | |
1427 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1428 | ||
a61f4e0c | 1429 | if (scm_is_null (cdddr_expr)) |
212e58ed DH |
1430 | { |
1431 | return scm_list_3 (scm_sym_if, um_condition, um_then); | |
1432 | } | |
1433 | else | |
1434 | { | |
1435 | const SCM um_else = unmemoize_expression (SCM_CAR (cdddr_expr), env); | |
1436 | return scm_list_4 (scm_sym_if, um_condition, um_then, um_else); | |
1437 | } | |
1438 | } | |
1439 | ||
302c12b4 | 1440 | |
3b88ed2a | 1441 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1442 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1443 | |
4610b011 DH |
1444 | /* A helper function for memoize_lambda to support checking for duplicate |
1445 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1446 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1447 | * forms that a formal argument can have: | |
1448 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1449 | static int |
4610b011 | 1450 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1451 | { |
a61f4e0c | 1452 | for (; scm_is_pair (list); list = SCM_CDR (list)) |
9fbee57e | 1453 | { |
bc36d050 | 1454 | if (scm_is_eq (SCM_CAR (list), obj)) |
4610b011 | 1455 | return 1; |
9fbee57e | 1456 | } |
bc36d050 | 1457 | return scm_is_eq (list, obj); |
5cb22e96 DH |
1458 | } |
1459 | ||
28d52ebb | 1460 | SCM |
03a3e941 | 1461 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1462 | { |
9fbee57e | 1463 | SCM formals; |
03a3e941 | 1464 | SCM formals_idx; |
34adf7ea DH |
1465 | SCM cddr_expr; |
1466 | int documentation; | |
1467 | SCM body; | |
1468 | SCM new_body; | |
03a3e941 DH |
1469 | |
1470 | const SCM cdr_expr = SCM_CDR (expr); | |
1471 | const long length = scm_ilength (cdr_expr); | |
1472 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1473 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1474 | |
03a3e941 DH |
1475 | /* Before iterating the list of formal arguments, make sure the formals |
1476 | * actually are given as either a symbol or a non-cyclic list. */ | |
1477 | formals = SCM_CAR (cdr_expr); | |
a61f4e0c | 1478 | if (scm_is_pair (formals)) |
03a3e941 DH |
1479 | { |
1480 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1481 | * detected, report a 'Bad formals' error. */ | |
1482 | } | |
1483 | else | |
1484 | { | |
a61f4e0c | 1485 | ASSERT_SYNTAX_2 (scm_is_symbol (formals) || scm_is_null (formals), |
03a3e941 DH |
1486 | s_bad_formals, formals, expr); |
1487 | } | |
1cc91f1b | 1488 | |
03a3e941 DH |
1489 | /* Now iterate the list of formal arguments to check if all formals are |
1490 | * symbols, and that there are no duplicates. */ | |
1491 | formals_idx = formals; | |
a61f4e0c | 1492 | while (scm_is_pair (formals_idx)) |
0f2d19dd | 1493 | { |
03a3e941 DH |
1494 | const SCM formal = SCM_CAR (formals_idx); |
1495 | const SCM next_idx = SCM_CDR (formals_idx); | |
cc95e00a | 1496 | ASSERT_SYNTAX_2 (scm_is_symbol (formal), s_bad_formal, formal, expr); |
03a3e941 DH |
1497 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), |
1498 | s_duplicate_formal, formal, expr); | |
1499 | formals_idx = next_idx; | |
0f2d19dd | 1500 | } |
a61f4e0c | 1501 | ASSERT_SYNTAX_2 (scm_is_null (formals_idx) || scm_is_symbol (formals_idx), |
03a3e941 | 1502 | s_bad_formal, formals_idx, expr); |
9fbee57e | 1503 | |
34adf7ea DH |
1504 | /* Memoize the body. Keep a potential documentation string. */ |
1505 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1506 | * some external database. Otherwise it will slow down execution, since | |
1507 | * the documentation string will have to be skipped with every execution | |
1508 | * of the closure. */ | |
1509 | cddr_expr = SCM_CDR (cdr_expr); | |
7f9994d9 | 1510 | documentation = (length >= 3 && scm_is_string (SCM_CAR (cddr_expr))); |
34adf7ea | 1511 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; |
430b8401 | 1512 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1513 | |
1514 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1515 | if (documentation) | |
1516 | SCM_SETCDR (cddr_expr, new_body); | |
1517 | else | |
1518 | SCM_SETCDR (cdr_expr, new_body); | |
1519 | return expr; | |
0f2d19dd | 1520 | } |
6dbd0af5 | 1521 | |
212e58ed DH |
1522 | static SCM |
1523 | unmemoize_lambda (const SCM expr, const SCM env) | |
1524 | { | |
1525 | const SCM formals = SCM_CADR (expr); | |
1526 | const SCM body = SCM_CDDR (expr); | |
1527 | ||
1528 | const SCM new_env = SCM_EXTEND_ENV (formals, SCM_EOL, env); | |
1529 | const SCM um_formals = scm_i_finite_list_copy (formals); | |
1530 | const SCM um_body = unmemoize_exprs (body, new_env); | |
1531 | ||
1532 | return scm_cons2 (scm_sym_lambda, um_formals, um_body); | |
1533 | } | |
1534 | ||
0f2d19dd | 1535 | |
d6754c23 | 1536 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1537 | static void |
d6754c23 | 1538 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1539 | { |
d6754c23 | 1540 | SCM binding_idx; |
302c12b4 | 1541 | |
d6754c23 DH |
1542 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1543 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1544 | |
d6754c23 | 1545 | binding_idx = bindings; |
a61f4e0c | 1546 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1547 | { |
d6754c23 DH |
1548 | SCM name; /* const */ |
1549 | ||
1550 | const SCM binding = SCM_CAR (binding_idx); | |
1551 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1552 | s_bad_binding, binding, expr); | |
1553 | ||
1554 | name = SCM_CAR (binding); | |
cc95e00a | 1555 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
0f2d19dd | 1556 | } |
d6754c23 | 1557 | } |
26d5b9b4 | 1558 | |
d6754c23 DH |
1559 | |
1560 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1561 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1562 | * variables are returned in a list with their order reversed, and the init | |
1563 | * forms are returned in a list in the same order as they are given in the | |
1564 | * bindings. If a duplicate variable name is detected, an error is | |
1565 | * signalled. */ | |
1566 | static void | |
1567 | transform_bindings ( | |
1568 | const SCM bindings, const SCM expr, | |
1569 | SCM *const rvarptr, SCM *const initptr ) | |
1570 | { | |
1571 | SCM rvariables = SCM_EOL; | |
1572 | SCM rinits = SCM_EOL; | |
1573 | SCM binding_idx = bindings; | |
a61f4e0c | 1574 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
d6754c23 DH |
1575 | { |
1576 | const SCM binding = SCM_CAR (binding_idx); | |
1577 | const SCM cdr_binding = SCM_CDR (binding); | |
1578 | const SCM name = SCM_CAR (binding); | |
7888309b | 1579 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rvariables)), |
d6754c23 DH |
1580 | s_duplicate_binding, name, expr); |
1581 | rvariables = scm_cons (name, rvariables); | |
1582 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1583 | } | |
1584 | *rvarptr = rvariables; | |
1585 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1586 | } |
1587 | ||
302c12b4 | 1588 | |
3b88ed2a | 1589 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1590 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1591 | |
d6754c23 DH |
1592 | /* This function is a helper function for memoize_let. It transforms |
1593 | * (let name ((var init) ...) body ...) into | |
1594 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1595 | * and memoizes the expression. It is assumed that the caller has checked | |
1596 | * that name is a symbol and that there are bindings and a body. */ | |
1597 | static SCM | |
1598 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1599 | { | |
1600 | SCM rvariables; | |
1601 | SCM variables; | |
1602 | SCM inits; | |
1603 | ||
1604 | const SCM cdr_expr = SCM_CDR (expr); | |
1605 | const SCM name = SCM_CAR (cdr_expr); | |
1606 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1607 | const SCM bindings = SCM_CAR (cddr_expr); | |
1608 | check_bindings (bindings, expr); | |
1609 | ||
1610 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1611 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1612 | ||
1613 | { | |
1614 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1615 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1616 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1617 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1618 | ||
1619 | const SCM rvar = scm_list_1 (name); | |
1620 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1621 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1622 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1623 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1624 | return scm_cons_source (expr, letrec_form, inits); | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1629 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1630 | SCM |
d6754c23 | 1631 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1632 | { |
d6754c23 DH |
1633 | SCM bindings; |
1634 | ||
1635 | const SCM cdr_expr = SCM_CDR (expr); | |
1636 | const long length = scm_ilength (cdr_expr); | |
1637 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1638 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1639 | |
d6754c23 | 1640 | bindings = SCM_CAR (cdr_expr); |
cc95e00a | 1641 | if (scm_is_symbol (bindings)) |
26d5b9b4 | 1642 | { |
d6754c23 DH |
1643 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1644 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1645 | } |
d6754c23 DH |
1646 | |
1647 | check_bindings (bindings, expr); | |
a61f4e0c | 1648 | if (scm_is_null (bindings) || scm_is_null (SCM_CDR (bindings))) |
26d5b9b4 | 1649 | { |
d6754c23 | 1650 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1651 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1652 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1653 | } |
302c12b4 DH |
1654 | else |
1655 | { | |
d6754c23 DH |
1656 | /* plain let */ |
1657 | SCM rvariables; | |
1658 | SCM inits; | |
1659 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1660 | |
302c12b4 | 1661 | { |
430b8401 | 1662 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1663 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1664 | SCM_SETCAR (expr, SCM_IM_LET); | |
1665 | SCM_SETCDR (expr, new_tail); | |
1666 | return expr; | |
302c12b4 DH |
1667 | } |
1668 | } | |
0f2d19dd JB |
1669 | } |
1670 | ||
212e58ed DH |
1671 | static SCM |
1672 | build_binding_list (SCM rnames, SCM rinits) | |
1673 | { | |
1674 | SCM bindings = SCM_EOL; | |
a61f4e0c | 1675 | while (!scm_is_null (rnames)) |
212e58ed DH |
1676 | { |
1677 | const SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); | |
1678 | bindings = scm_cons (binding, bindings); | |
1679 | rnames = SCM_CDR (rnames); | |
1680 | rinits = SCM_CDR (rinits); | |
1681 | } | |
1682 | return bindings; | |
1683 | } | |
1684 | ||
1685 | static SCM | |
1686 | unmemoize_let (const SCM expr, const SCM env) | |
1687 | { | |
1688 | const SCM cdr_expr = SCM_CDR (expr); | |
1689 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1690 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1691 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1692 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), env); | |
1693 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1694 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1695 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1696 | ||
1697 | return scm_cons2 (scm_sym_let, um_bindings, um_body); | |
1698 | } | |
1699 | ||
1700 | ||
1701 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); | |
1702 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); | |
1703 | ||
1704 | SCM | |
1705 | scm_m_letrec (SCM expr, SCM env) | |
1706 | { | |
1707 | SCM bindings; | |
1708 | ||
1709 | const SCM cdr_expr = SCM_CDR (expr); | |
1710 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1711 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1712 | ||
1713 | bindings = SCM_CAR (cdr_expr); | |
a61f4e0c | 1714 | if (scm_is_null (bindings)) |
212e58ed DH |
1715 | { |
1716 | /* no bindings, let* is executed faster */ | |
1717 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1718 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); | |
1719 | } | |
1720 | else | |
1721 | { | |
1722 | SCM rvariables; | |
1723 | SCM inits; | |
1724 | SCM new_body; | |
1725 | ||
1726 | check_bindings (bindings, expr); | |
1727 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1728 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1729 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); | |
1730 | } | |
1731 | } | |
1732 | ||
1733 | static SCM | |
1734 | unmemoize_letrec (const SCM expr, const SCM env) | |
1735 | { | |
1736 | const SCM cdr_expr = SCM_CDR (expr); | |
1737 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1738 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1739 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1740 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), extended_env); | |
1741 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1742 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1743 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1744 | ||
1745 | return scm_cons2 (scm_sym_letrec, um_bindings, um_body); | |
1746 | } | |
1747 | ||
1748 | ||
0f2d19dd | 1749 | |
3b88ed2a | 1750 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1751 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1752 | |
d6754c23 DH |
1753 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1754 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1755 | SCM |
d6754c23 | 1756 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1757 | { |
d6754c23 | 1758 | SCM binding_idx; |
d6754c23 | 1759 | SCM new_body; |
0f2d19dd | 1760 | |
d6754c23 DH |
1761 | const SCM cdr_expr = SCM_CDR (expr); |
1762 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1763 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1764 | |
d6754c23 DH |
1765 | binding_idx = SCM_CAR (cdr_expr); |
1766 | check_bindings (binding_idx, expr); | |
1767 | ||
461bffb1 DH |
1768 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1769 | * transformation is done in place. At the beginning of one iteration of | |
1770 | * the loop the variable binding_idx holds the form | |
1771 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1772 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1773 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1774 | * untouched. After the execution of the loop, P1 will hold | |
1775 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1776 | * and binding_idx will hold P3. */ | |
a61f4e0c | 1777 | while (!scm_is_null (binding_idx)) |
9fbee57e | 1778 | { |
461bffb1 | 1779 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1780 | const SCM binding = SCM_CAR (binding_idx); |
1781 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1782 | const SCM cdr_binding = SCM_CDR (binding); |
1783 | ||
1784 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1785 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1786 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1787 | ||
1788 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1789 | } |
1790 | ||
430b8401 | 1791 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1792 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1793 | /* the bindings have been changed in place */ | |
1794 | SCM_SETCDR (cdr_expr, new_body); | |
1795 | return expr; | |
9fbee57e | 1796 | } |
b8229a3b | 1797 | |
212e58ed DH |
1798 | static SCM |
1799 | unmemoize_letstar (const SCM expr, const SCM env) | |
0f2d19dd | 1800 | { |
d6754c23 | 1801 | const SCM cdr_expr = SCM_CDR (expr); |
212e58ed DH |
1802 | const SCM body = SCM_CDR (cdr_expr); |
1803 | SCM bindings = SCM_CAR (cdr_expr); | |
1804 | SCM um_bindings = SCM_EOL; | |
1805 | SCM extended_env = env; | |
1806 | SCM um_body; | |
d6754c23 | 1807 | |
a61f4e0c | 1808 | while (!scm_is_null (bindings)) |
9fbee57e | 1809 | { |
212e58ed DH |
1810 | const SCM variable = SCM_CAR (bindings); |
1811 | const SCM init = SCM_CADR (bindings); | |
1812 | const SCM um_init = unmemoize_expression (init, extended_env); | |
1813 | um_bindings = scm_cons (scm_list_2 (variable, um_init), um_bindings); | |
1814 | extended_env = SCM_EXTEND_ENV (variable, SCM_BOOL_F, extended_env); | |
1815 | bindings = SCM_CDDR (bindings); | |
9fbee57e | 1816 | } |
212e58ed | 1817 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); |
d6754c23 | 1818 | |
212e58ed DH |
1819 | um_body = unmemoize_exprs (body, extended_env); |
1820 | ||
1821 | return scm_cons2 (scm_sym_letstar, um_bindings, um_body); | |
0f2d19dd JB |
1822 | } |
1823 | ||
73b64342 | 1824 | |
3b88ed2a | 1825 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1826 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1827 | |
1828 | SCM | |
21628685 | 1829 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1830 | { |
21628685 DH |
1831 | const SCM cdr_expr = SCM_CDR (expr); |
1832 | const long length = scm_ilength (cdr_expr); | |
1833 | ||
1834 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1835 | ||
1836 | if (length == 0) | |
1837 | { | |
1838 | /* Special case: (or) is replaced by #f. */ | |
1839 | return SCM_BOOL_F; | |
1840 | } | |
9fbee57e | 1841 | else |
21628685 DH |
1842 | { |
1843 | SCM_SETCAR (expr, SCM_IM_OR); | |
1844 | return expr; | |
1845 | } | |
73b64342 MD |
1846 | } |
1847 | ||
212e58ed DH |
1848 | static SCM |
1849 | unmemoize_or (const SCM expr, const SCM env) | |
1850 | { | |
1851 | return scm_cons (scm_sym_or, unmemoize_exprs (SCM_CDR (expr), env)); | |
1852 | } | |
1853 | ||
73b64342 | 1854 | |
9fbee57e DH |
1855 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1856 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1857 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1858 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1859 | |
1860 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1861 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1862 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1863 | * nesting level and is known to be greater than zero. */ | |
1864 | static SCM | |
1865 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1866 | { |
a61f4e0c | 1867 | if (scm_is_pair (form)) |
c96d76b8 | 1868 | { |
21628685 | 1869 | const SCM tmp = SCM_CAR (form); |
bc36d050 | 1870 | if (scm_is_eq (tmp, scm_sym_quasiquote)) |
9fbee57e | 1871 | { |
21628685 DH |
1872 | const SCM args = SCM_CDR (form); |
1873 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1874 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1875 | } | |
bc36d050 | 1876 | else if (scm_is_eq (tmp, scm_sym_unquote)) |
9fbee57e | 1877 | { |
21628685 DH |
1878 | const SCM args = SCM_CDR (form); |
1879 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1880 | if (depth - 1 == 0) |
1881 | return scm_eval_car (args, env); | |
1882 | else | |
1883 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1884 | } | |
a61f4e0c | 1885 | else if (scm_is_pair (tmp) |
bc36d050 | 1886 | && scm_is_eq (SCM_CAR (tmp), scm_sym_uq_splicing)) |
9fbee57e | 1887 | { |
21628685 DH |
1888 | const SCM args = SCM_CDR (tmp); |
1889 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1890 | if (depth - 1 == 0) |
1891 | { | |
21628685 DH |
1892 | const SCM list = scm_eval_car (args, env); |
1893 | const SCM rest = SCM_CDR (form); | |
1894 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1895 | s_splicing, list, form); | |
9fbee57e DH |
1896 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1897 | } | |
1898 | else | |
1899 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1900 | iqq (SCM_CDR (form), env, depth)); | |
1901 | } | |
1902 | else | |
1903 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1904 | iqq (SCM_CDR (form), env, depth)); | |
1905 | } | |
4057a3e0 MV |
1906 | else if (scm_is_vector (form)) |
1907 | return scm_vector (iqq (scm_vector_to_list (form), env, depth)); | |
9fbee57e DH |
1908 | else |
1909 | return form; | |
1910 | } | |
1911 | ||
1912 | SCM | |
21628685 | 1913 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1914 | { |
21628685 DH |
1915 | const SCM cdr_expr = SCM_CDR (expr); |
1916 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1917 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1918 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1919 | } |
1920 | ||
1921 | ||
3b88ed2a | 1922 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1923 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1924 | ||
1925 | SCM | |
21628685 | 1926 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1927 | { |
21628685 DH |
1928 | SCM quotee; |
1929 | ||
1930 | const SCM cdr_expr = SCM_CDR (expr); | |
1931 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1932 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1933 | quotee = SCM_CAR (cdr_expr); | |
5fb64383 | 1934 | if (is_self_quoting_p (quotee)) |
21628685 | 1935 | return quotee; |
e7313a9d | 1936 | |
21628685 | 1937 | SCM_SETCAR (expr, SCM_IM_QUOTE); |
e7313a9d | 1938 | SCM_SETCDR (expr, quotee); |
21628685 | 1939 | return expr; |
9fbee57e DH |
1940 | } |
1941 | ||
e7313a9d DH |
1942 | static SCM |
1943 | unmemoize_quote (const SCM expr, const SCM env SCM_UNUSED) | |
1944 | { | |
1945 | return scm_list_2 (scm_sym_quote, SCM_CDR (expr)); | |
1946 | } | |
1947 | ||
9fbee57e DH |
1948 | |
1949 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1950 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1951 | static const char s_set_x[] = "set!"; |
1952 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1953 | ||
1954 | SCM | |
82b3e2c6 | 1955 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1956 | { |
82b3e2c6 | 1957 | SCM variable; |
36245b66 | 1958 | SCM new_variable; |
82b3e2c6 DH |
1959 | |
1960 | const SCM cdr_expr = SCM_CDR (expr); | |
1961 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1962 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1963 | variable = SCM_CAR (cdr_expr); | |
36245b66 DH |
1964 | |
1965 | /* Memoize the variable form. */ | |
cc95e00a | 1966 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
36245b66 | 1967 | new_variable = lookup_symbol (variable, env); |
36245b66 DH |
1968 | /* Leave the memoization of unbound symbols to lazy memoization: */ |
1969 | if (SCM_UNBNDP (new_variable)) | |
1970 | new_variable = variable; | |
82b3e2c6 DH |
1971 | |
1972 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
36245b66 | 1973 | SCM_SETCAR (cdr_expr, new_variable); |
82b3e2c6 | 1974 | return expr; |
9fbee57e DH |
1975 | } |
1976 | ||
212e58ed DH |
1977 | static SCM |
1978 | unmemoize_set_x (const SCM expr, const SCM env) | |
1979 | { | |
1980 | return scm_cons (scm_sym_set_x, unmemoize_exprs (SCM_CDR (expr), env)); | |
1981 | } | |
1982 | ||
9fbee57e DH |
1983 | |
1984 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1985 | ||
1986 | ||
3b88ed2a | 1987 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1988 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1989 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1990 | ||
1991 | SCM | |
82b3e2c6 | 1992 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1993 | { |
82b3e2c6 DH |
1994 | const SCM cdr_expr = SCM_CDR (expr); |
1995 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1996 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1997 | |
82b3e2c6 DH |
1998 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1999 | return expr; | |
2000 | } | |
2e171178 | 2001 | |
212e58ed DH |
2002 | static SCM |
2003 | unmemoize_apply (const SCM expr, const SCM env) | |
2004 | { | |
2005 | return scm_list_2 (scm_sym_atapply, unmemoize_exprs (SCM_CDR (expr), env)); | |
2006 | } | |
2007 | ||
2e171178 | 2008 | |
3b88ed2a | 2009 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 2010 | |
82b3e2c6 DH |
2011 | /* FIXME: The following explanation should go into the documentation: */ |
2012 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
2013 | * the global variables named by `var's (symbols, not evaluated), creating | |
2014 | * them if they don't exist, executes body, and then restores the previous | |
2015 | * values of the `var's. Additionally, whenever control leaves body, the | |
2016 | * values of the `var's are saved and restored when control returns. It is an | |
2017 | * error when a symbol appears more than once among the `var's. All `init's | |
2018 | * are evaluated before any `var' is set. | |
2019 | * | |
2020 | * Think of this as `let' for dynamic scope. | |
2021 | */ | |
2022 | ||
2023 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
2024 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
2025 | * | |
2026 | * FIXME - also implement `@bind*'. | |
2027 | */ | |
73b64342 | 2028 | SCM |
82b3e2c6 | 2029 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 2030 | { |
82b3e2c6 DH |
2031 | SCM bindings; |
2032 | SCM rvariables; | |
2033 | SCM inits; | |
2034 | SCM variable_idx; | |
2e171178 | 2035 | |
82b3e2c6 | 2036 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 2037 | |
82b3e2c6 DH |
2038 | const SCM cdr_expr = SCM_CDR (expr); |
2039 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2040 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
2041 | bindings = SCM_CAR (cdr_expr); | |
2042 | check_bindings (bindings, expr); | |
2043 | transform_bindings (bindings, expr, &rvariables, &inits); | |
2044 | ||
2045 | for (variable_idx = rvariables; | |
a61f4e0c | 2046 | !scm_is_null (variable_idx); |
82b3e2c6 | 2047 | variable_idx = SCM_CDR (variable_idx)) |
73b64342 | 2048 | { |
82b3e2c6 DH |
2049 | /* The first call to scm_sym2var will look beyond the current module, |
2050 | * while the second call wont. */ | |
2051 | const SCM variable = SCM_CAR (variable_idx); | |
2052 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
7888309b | 2053 | if (scm_is_false (new_variable)) |
82b3e2c6 DH |
2054 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); |
2055 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 2056 | } |
82b3e2c6 DH |
2057 | |
2058 | SCM_SETCAR (expr, SCM_IM_BIND); | |
2059 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
2060 | return expr; | |
73b64342 | 2061 | } |
73b64342 | 2062 | |
b0c5d67b | 2063 | |
3b88ed2a | 2064 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
2065 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
2066 | ||
9fbee57e | 2067 | SCM |
da48db62 | 2068 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2069 | { |
da48db62 DH |
2070 | const SCM cdr_expr = SCM_CDR (expr); |
2071 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2072 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2073 | ||
2074 | SCM_SETCAR (expr, SCM_IM_CONT); | |
2075 | return expr; | |
b0c5d67b | 2076 | } |
b0c5d67b | 2077 | |
212e58ed DH |
2078 | static SCM |
2079 | unmemoize_atcall_cc (const SCM expr, const SCM env) | |
2080 | { | |
2081 | return scm_list_2 (scm_sym_atcall_cc, unmemoize_exprs (SCM_CDR (expr), env)); | |
2082 | } | |
2083 | ||
b0c5d67b | 2084 | |
3b88ed2a | 2085 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 2086 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
2087 | |
2088 | SCM | |
da48db62 | 2089 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2090 | { |
da48db62 DH |
2091 | const SCM cdr_expr = SCM_CDR (expr); |
2092 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2093 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2094 | ||
2095 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
2096 | return expr; | |
b0c5d67b | 2097 | } |
b0c5d67b | 2098 | |
212e58ed DH |
2099 | static SCM |
2100 | unmemoize_at_call_with_values (const SCM expr, const SCM env) | |
2101 | { | |
2102 | return scm_list_2 (scm_sym_at_call_with_values, | |
2103 | unmemoize_exprs (SCM_CDR (expr), env)); | |
2104 | } | |
2105 | ||
2f263a6a MV |
2106 | #if 0 |
2107 | ||
2108 | /* See futures.h for a comment why futures are not enabled. | |
2109 | */ | |
b0c5d67b | 2110 | |
3b88ed2a | 2111 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 2112 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 2113 | |
9fbee57e DH |
2114 | /* Like promises, futures are implemented as closures with an empty |
2115 | * parameter list. Thus, (future <expression>) is transformed into | |
2116 | * (#@future '() <expression>), where the empty list represents the | |
2117 | * empty parameter list. This representation allows for easy creation | |
2118 | * of the closure during evaluation. */ | |
a513ead3 | 2119 | SCM |
8ae95199 | 2120 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 2121 | { |
8ae95199 DH |
2122 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
2123 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
2124 | return new_expr; | |
a513ead3 MV |
2125 | } |
2126 | ||
212e58ed DH |
2127 | static SCM |
2128 | unmemoize_future (const SCM expr, const SCM env) | |
2129 | { | |
2130 | const SCM thunk_expr = SCM_CADDR (expr); | |
2131 | return scm_list_2 (scm_sym_future, unmemoize_expression (thunk_expr, env)); | |
2132 | } | |
2133 | ||
2f263a6a | 2134 | #endif |
9fbee57e | 2135 | |
3b88ed2a | 2136 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
2137 | SCM_SYMBOL (scm_sym_setter, "setter"); |
2138 | ||
2139 | SCM | |
7893dbbf | 2140 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 2141 | { |
7893dbbf | 2142 | SCM target, exp_target; |
da48db62 DH |
2143 | |
2144 | const SCM cdr_expr = SCM_CDR (expr); | |
2145 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2146 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2147 | ||
2148 | target = SCM_CAR (cdr_expr); | |
a61f4e0c | 2149 | if (!scm_is_pair (target)) |
da48db62 DH |
2150 | { |
2151 | /* R5RS usage */ | |
2152 | return scm_m_set_x (expr, env); | |
2153 | } | |
9fbee57e | 2154 | else |
da48db62 DH |
2155 | { |
2156 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
2157 | /* Macroexpanding the target might return things of the form |
2158 | (begin <atom>). In that case, <atom> must be a symbol or a | |
2159 | variable and we memoize to (set! <atom> ...). | |
2160 | */ | |
2b189e65 | 2161 | exp_target = macroexp (target, env); |
bc36d050 | 2162 | if (scm_is_eq (SCM_CAR (exp_target), SCM_IM_BEGIN) |
a61f4e0c MV |
2163 | && !scm_is_null (SCM_CDR (exp_target)) |
2164 | && scm_is_null (SCM_CDDR (exp_target))) | |
7893dbbf MV |
2165 | { |
2166 | exp_target= SCM_CADR (exp_target); | |
cc95e00a | 2167 | ASSERT_SYNTAX_2 (scm_is_symbol (exp_target) |
6d1a2e9f MV |
2168 | || SCM_VARIABLEP (exp_target), |
2169 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
2170 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
2171 | SCM_CDR (cdr_expr))); | |
2172 | } | |
2173 | else | |
2174 | { | |
2175 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
2176 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
2177 | setter_proc_tail); | |
da48db62 | 2178 | |
7893dbbf MV |
2179 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
2180 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
2181 | cddr_expr)); | |
da48db62 | 2182 | |
7893dbbf MV |
2183 | SCM_SETCAR (expr, setter_proc); |
2184 | SCM_SETCDR (expr, setter_args); | |
2185 | return expr; | |
2186 | } | |
da48db62 | 2187 | } |
9fbee57e DH |
2188 | } |
2189 | ||
2190 | ||
a4aa2134 DH |
2191 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
2192 | * soon as the module system allows us to more freely create bindings in | |
2193 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2194 | * moved here. */ | |
212e58ed DH |
2195 | |
2196 | SCM_SYMBOL (sym_atslot_ref, "@slot-ref"); | |
2197 | ||
9fbee57e | 2198 | SCM |
9a848baf | 2199 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2200 | { |
9a848baf DH |
2201 | SCM slot_nr; |
2202 | ||
2203 | const SCM cdr_expr = SCM_CDR (expr); | |
2204 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2205 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2206 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2207 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9fbee57e | 2208 | |
9a848baf | 2209 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
e7313a9d | 2210 | SCM_SETCDR (cdr_expr, slot_nr); |
9a848baf DH |
2211 | return expr; |
2212 | } | |
9fbee57e | 2213 | |
212e58ed DH |
2214 | static SCM |
2215 | unmemoize_atslot_ref (const SCM expr, const SCM env) | |
2216 | { | |
2217 | const SCM instance = SCM_CADR (expr); | |
2218 | const SCM um_instance = unmemoize_expression (instance, env); | |
2219 | const SCM slot_nr = SCM_CDDR (expr); | |
2220 | return scm_list_3 (sym_atslot_ref, um_instance, slot_nr); | |
2221 | } | |
2222 | ||
9fbee57e | 2223 | |
a4aa2134 DH |
2224 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
2225 | * soon as the module system allows us to more freely create bindings in | |
2226 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2227 | * moved here. */ | |
212e58ed DH |
2228 | |
2229 | SCM_SYMBOL (sym_atslot_set_x, "@slot-set!"); | |
2230 | ||
9fbee57e | 2231 | SCM |
9a848baf | 2232 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2233 | { |
9a848baf DH |
2234 | SCM slot_nr; |
2235 | ||
2236 | const SCM cdr_expr = SCM_CDR (expr); | |
2237 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2238 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
2239 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2240 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9a848baf DH |
2241 | |
2242 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
2243 | return expr; | |
9fbee57e | 2244 | } |
9fbee57e | 2245 | |
212e58ed DH |
2246 | static SCM |
2247 | unmemoize_atslot_set_x (const SCM expr, const SCM env) | |
2248 | { | |
2249 | const SCM cdr_expr = SCM_CDR (expr); | |
2250 | const SCM instance = SCM_CAR (cdr_expr); | |
2251 | const SCM um_instance = unmemoize_expression (instance, env); | |
2252 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
2253 | const SCM slot_nr = SCM_CAR (cddr_expr); | |
2254 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
2255 | const SCM value = SCM_CAR (cdddr_expr); | |
2256 | const SCM um_value = unmemoize_expression (value, env); | |
2257 | return scm_list_4 (sym_atslot_set_x, um_instance, slot_nr, um_value); | |
2258 | } | |
2259 | ||
9fbee57e DH |
2260 | |
2261 | #if SCM_ENABLE_ELISP | |
2262 | ||
70c1c108 DH |
2263 | static const char s_defun[] = "Symbol's function definition is void"; |
2264 | ||
3b88ed2a | 2265 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 2266 | |
70c1c108 DH |
2267 | /* nil-cond expressions have the form |
2268 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 2269 | SCM |
70c1c108 | 2270 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2271 | { |
70c1c108 DH |
2272 | const long length = scm_ilength (SCM_CDR (expr)); |
2273 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
2274 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
2275 | ||
2276 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
2277 | return expr; | |
9fbee57e DH |
2278 | } |
2279 | ||
2280 | ||
3b88ed2a | 2281 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 2282 | |
70c1c108 DH |
2283 | /* The @fop-macro handles procedure and macro applications for elisp. The |
2284 | * input expression must have the form | |
2285 | * (@fop <var> (transformer-macro <expr> ...)) | |
2286 | * where <var> must be a symbol. The expression is transformed into the | |
2287 | * memoized form of either | |
2288 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
2289 | * if the value of var (across all aliasing) is not a macro, or | |
2290 | * (<un-aliased var> <expr> ...) | |
2291 | * if var is a macro. */ | |
9fbee57e | 2292 | SCM |
70c1c108 | 2293 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2294 | { |
70c1c108 DH |
2295 | SCM location; |
2296 | SCM symbol; | |
2297 | ||
2298 | const SCM cdr_expr = SCM_CDR (expr); | |
2299 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2300 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
2301 | ||
2302 | symbol = SCM_CAR (cdr_expr); | |
cc95e00a | 2303 | ASSERT_SYNTAX_2 (scm_is_symbol (symbol), s_bad_variable, symbol, expr); |
70c1c108 DH |
2304 | |
2305 | location = scm_symbol_fref (symbol); | |
2306 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
2307 | ||
2308 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
2309 | * look up such definitions, the chain of symbol definitions has to be | |
2310 | * followed up to the terminal symbol. */ | |
cc95e00a | 2311 | while (scm_is_symbol (SCM_VARIABLE_REF (location))) |
9fbee57e | 2312 | { |
70c1c108 DH |
2313 | const SCM alias = SCM_VARIABLE_REF (location); |
2314 | location = scm_symbol_fref (alias); | |
2315 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 2316 | } |
70c1c108 DH |
2317 | |
2318 | /* Memoize the value location belonging to the terminal symbol. */ | |
2319 | SCM_SETCAR (cdr_expr, location); | |
2320 | ||
2321 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2322 | { |
70c1c108 DH |
2323 | /* Since the location does not contain a macro, the form is a procedure |
2324 | * application. Replace `@fop' by `@apply' and transform the expression | |
2325 | * including the `transformer-macro'. */ | |
2326 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2327 | return expr; | |
2328 | } | |
2329 | else | |
2330 | { | |
2331 | /* Since the location contains a macro, the arguments should not be | |
2332 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2333 | * expression starts with the memoized variable, that is at the cdr of | |
2334 | * the input expression. */ | |
2335 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2336 | return cdr_expr; | |
9fbee57e | 2337 | } |
9fbee57e DH |
2338 | } |
2339 | ||
2340 | #endif /* SCM_ENABLE_ELISP */ | |
2341 | ||
2342 | ||
212e58ed DH |
2343 | static SCM |
2344 | unmemoize_builtin_macro (const SCM expr, const SCM env) | |
2345 | { | |
2346 | switch (ISYMNUM (SCM_CAR (expr))) | |
2347 | { | |
2348 | case (ISYMNUM (SCM_IM_AND)): | |
2349 | return unmemoize_and (expr, env); | |
2350 | ||
2351 | case (ISYMNUM (SCM_IM_BEGIN)): | |
2352 | return unmemoize_begin (expr, env); | |
2353 | ||
2354 | case (ISYMNUM (SCM_IM_CASE)): | |
2355 | return unmemoize_case (expr, env); | |
2356 | ||
2357 | case (ISYMNUM (SCM_IM_COND)): | |
2358 | return unmemoize_cond (expr, env); | |
2359 | ||
2360 | case (ISYMNUM (SCM_IM_DELAY)): | |
2361 | return unmemoize_delay (expr, env); | |
2362 | ||
2363 | case (ISYMNUM (SCM_IM_DO)): | |
2364 | return unmemoize_do (expr, env); | |
2365 | ||
2366 | case (ISYMNUM (SCM_IM_IF)): | |
2367 | return unmemoize_if (expr, env); | |
2368 | ||
2369 | case (ISYMNUM (SCM_IM_LAMBDA)): | |
2370 | return unmemoize_lambda (expr, env); | |
2371 | ||
2372 | case (ISYMNUM (SCM_IM_LET)): | |
2373 | return unmemoize_let (expr, env); | |
2374 | ||
2375 | case (ISYMNUM (SCM_IM_LETREC)): | |
2376 | return unmemoize_letrec (expr, env); | |
2377 | ||
2378 | case (ISYMNUM (SCM_IM_LETSTAR)): | |
2379 | return unmemoize_letstar (expr, env); | |
2380 | ||
2381 | case (ISYMNUM (SCM_IM_OR)): | |
2382 | return unmemoize_or (expr, env); | |
2383 | ||
2384 | case (ISYMNUM (SCM_IM_QUOTE)): | |
2385 | return unmemoize_quote (expr, env); | |
2386 | ||
2387 | case (ISYMNUM (SCM_IM_SET_X)): | |
2388 | return unmemoize_set_x (expr, env); | |
2389 | ||
2390 | case (ISYMNUM (SCM_IM_APPLY)): | |
2391 | return unmemoize_apply (expr, env); | |
2392 | ||
2393 | case (ISYMNUM (SCM_IM_BIND)): | |
2394 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2395 | ||
2396 | case (ISYMNUM (SCM_IM_CONT)): | |
2397 | return unmemoize_atcall_cc (expr, env); | |
2398 | ||
2399 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): | |
2400 | return unmemoize_at_call_with_values (expr, env); | |
2401 | ||
2f263a6a MV |
2402 | #if 0 |
2403 | /* See futures.h for a comment why futures are not enabled. | |
2404 | */ | |
212e58ed DH |
2405 | case (ISYMNUM (SCM_IM_FUTURE)): |
2406 | return unmemoize_future (expr, env); | |
2f263a6a | 2407 | #endif |
212e58ed DH |
2408 | |
2409 | case (ISYMNUM (SCM_IM_SLOT_REF)): | |
2410 | return unmemoize_atslot_ref (expr, env); | |
2411 | ||
2412 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): | |
2413 | return unmemoize_atslot_set_x (expr, env); | |
2414 | ||
2415 | case (ISYMNUM (SCM_IM_NIL_COND)): | |
2416 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2417 | ||
2418 | default: | |
2419 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2420 | } | |
2421 | } | |
2422 | ||
2423 | ||
9fcf3cbb DH |
2424 | /* scm_i_unmemocopy_expr and scm_i_unmemocopy_body take a memoized expression |
2425 | * respectively a memoized body together with its environment and rewrite it | |
2426 | * to its original form. Thus, these functions are the inversion of the | |
2427 | * rewrite rules above. The procedure is not optimized for speed. It's used | |
2428 | * in scm_i_unmemoize_expr, scm_procedure_source, macro_print and scm_iprin1. | |
212e58ed DH |
2429 | * |
2430 | * Unmemoizing is not a reliable process. You cannot in general expect to get | |
2431 | * the original source back. | |
2432 | * | |
2433 | * However, GOOPS currently relies on this for method compilation. This ought | |
2434 | * to change. */ | |
2435 | ||
2436 | SCM | |
9fcf3cbb DH |
2437 | scm_i_unmemocopy_expr (SCM expr, SCM env) |
2438 | { | |
2439 | const SCM source_properties = scm_whash_lookup (scm_source_whash, expr); | |
2440 | const SCM um_expr = unmemoize_expression (expr, env); | |
2441 | ||
7888309b | 2442 | if (scm_is_true (source_properties)) |
9fcf3cbb DH |
2443 | scm_whash_insert (scm_source_whash, um_expr, source_properties); |
2444 | ||
2445 | return um_expr; | |
2446 | } | |
2447 | ||
2448 | SCM | |
2449 | scm_i_unmemocopy_body (SCM forms, SCM env) | |
212e58ed DH |
2450 | { |
2451 | const SCM source_properties = scm_whash_lookup (scm_source_whash, forms); | |
2452 | const SCM um_forms = unmemoize_exprs (forms, env); | |
2453 | ||
7888309b | 2454 | if (scm_is_true (source_properties)) |
212e58ed DH |
2455 | scm_whash_insert (scm_source_whash, um_forms, source_properties); |
2456 | ||
2457 | return um_forms; | |
2458 | } | |
2459 | ||
2460 | ||
434f2f7a | 2461 | #if (SCM_ENABLE_DEPRECATED == 1) |
f58c472a | 2462 | |
434f2f7a DH |
2463 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ |
2464 | SCM | |
2465 | scm_m_expand_body (SCM exprs, SCM env) | |
2466 | { | |
2467 | scm_c_issue_deprecation_warning | |
2468 | ("`scm_m_expand_body' is deprecated."); | |
2469 | m_expand_body (exprs, env); | |
2470 | return exprs; | |
2471 | } | |
f58c472a | 2472 | |
f58c472a DH |
2473 | |
2474 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2475 | ||
2476 | SCM | |
70c1c108 | 2477 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2478 | { |
70c1c108 DH |
2479 | SCM variable; |
2480 | SCM location; | |
2481 | ||
2482 | const SCM cdr_expr = SCM_CDR (expr); | |
2483 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2484 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2485 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2486 | ||
2b189e65 MV |
2487 | scm_c_issue_deprecation_warning |
2488 | ("`undefine' is deprecated.\n"); | |
2489 | ||
70c1c108 | 2490 | variable = SCM_CAR (cdr_expr); |
cc95e00a | 2491 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
70c1c108 | 2492 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); |
7888309b | 2493 | ASSERT_SYNTAX_2 (scm_is_true (location) |
70c1c108 DH |
2494 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), |
2495 | "variable already unbound ", variable, expr); | |
2496 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2497 | return SCM_UNSPECIFIED; |
f58c472a DH |
2498 | } |
2499 | ||
26d5b9b4 MD |
2500 | SCM |
2501 | scm_macroexp (SCM x, SCM env) | |
2502 | { | |
2b189e65 MV |
2503 | scm_c_issue_deprecation_warning |
2504 | ("`scm_macroexp' is deprecated."); | |
2505 | return macroexp (x, env); | |
26d5b9b4 | 2506 | } |
73b64342 | 2507 | |
6f81708a DH |
2508 | #endif |
2509 | ||
60a49842 | 2510 | |
212e58ed | 2511 | #if (SCM_ENABLE_DEPRECATED == 1) |
26d5b9b4 | 2512 | |
212e58ed DH |
2513 | SCM |
2514 | scm_unmemocar (SCM form, SCM env) | |
8ea46249 | 2515 | { |
212e58ed DH |
2516 | scm_c_issue_deprecation_warning |
2517 | ("`scm_unmemocar' is deprecated."); | |
60a49842 | 2518 | |
a61f4e0c | 2519 | if (!scm_is_pair (form)) |
60a49842 DH |
2520 | return form; |
2521 | else | |
2522 | { | |
2523 | SCM c = SCM_CAR (form); | |
2524 | if (SCM_VARIABLEP (c)) | |
2525 | { | |
2526 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
7888309b | 2527 | if (scm_is_false (sym)) |
60a49842 DH |
2528 | sym = sym_three_question_marks; |
2529 | SCM_SETCAR (form, sym); | |
2530 | } | |
2531 | else if (SCM_ILOCP (c)) | |
2532 | { | |
2533 | unsigned long int ir; | |
2534 | ||
2535 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2536 | env = SCM_CDR (env); | |
2537 | env = SCM_CAAR (env); | |
2538 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2539 | env = SCM_CDR (env); | |
f62b9dff | 2540 | |
60a49842 DH |
2541 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2542 | } | |
2543 | return form; | |
2544 | } | |
2545 | } | |
2546 | ||
434f2f7a DH |
2547 | #endif |
2548 | ||
6f81708a DH |
2549 | /*****************************************************************************/ |
2550 | /*****************************************************************************/ | |
2551 | /* The definitions for execution start here. */ | |
2552 | /*****************************************************************************/ | |
2553 | /*****************************************************************************/ | |
2554 | ||
2555 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2556 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2557 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2558 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
7c9c0169 | 2559 | SCM_SYMBOL (sym_instead, "instead"); |
6f81708a DH |
2560 | |
2561 | /* A function object to implement "apply" for non-closure functions. */ | |
2562 | static SCM f_apply; | |
2563 | /* An endless list consisting of #<undefined> objects: */ | |
2564 | static SCM undefineds; | |
2565 | ||
2566 | ||
2567 | int | |
6e8d25a6 | 2568 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2569 | { |
a61f4e0c | 2570 | while (!scm_is_null (formals)) |
0f2d19dd | 2571 | { |
a61f4e0c | 2572 | if (!scm_is_pair (formals)) |
ff467021 | 2573 | return 0; |
a61f4e0c | 2574 | if (scm_is_null (args)) |
ff467021 | 2575 | return 1; |
0f2d19dd JB |
2576 | formals = SCM_CDR (formals); |
2577 | args = SCM_CDR (args); | |
2578 | } | |
a61f4e0c | 2579 | return !scm_is_null (args) ? 1 : 0; |
0f2d19dd | 2580 | } |
a392ee15 | 2581 | |
0f2d19dd | 2582 | \f |
62360b89 | 2583 | |
434f2f7a DH |
2584 | /* The evaluator contains a plethora of EVAL symbols. This is an attempt at |
2585 | * explanation. | |
62360b89 | 2586 | * |
434f2f7a DH |
2587 | * The following macros should be used in code which is read twice (where the |
2588 | * choice of evaluator is hard soldered): | |
62360b89 | 2589 | * |
434f2f7a DH |
2590 | * CEVAL is the symbol used within one evaluator to call itself. |
2591 | * Originally, it is defined to ceval, but is redefined to deval during the | |
2592 | * second pass. | |
62360b89 | 2593 | * |
385609b9 | 2594 | * SCM_I_EVALIM is used when it is known that the expression is an |
62360b89 | 2595 | * immediate. (This macro never calls an evaluator.) |
434f2f7a DH |
2596 | * |
2597 | * EVAL evaluates an expression that is expected to have its symbols already | |
2598 | * memoized. Expressions that are not of the form '(<form> <form> ...)' are | |
2599 | * evaluated inline without calling an evaluator. | |
2600 | * | |
2601 | * EVALCAR evaluates the car of an expression 'X:(Y:<form> <form> ...)', | |
2602 | * potentially replacing a symbol at the position Y:<form> by its memoized | |
2603 | * variable. If Y:<form> is not of the form '(<form> <form> ...)', the | |
2604 | * evaluation is performed inline without calling an evaluator. | |
62360b89 DH |
2605 | * |
2606 | * The following macros should be used in code which is read once | |
2607 | * (where the choice of evaluator is dynamic): | |
2608 | * | |
385609b9 | 2609 | * SCM_I_XEVAL corresponds to EVAL, but uses ceval *or* deval depending on the |
434f2f7a | 2610 | * debugging mode. |
62360b89 | 2611 | * |
385609b9 | 2612 | * SCM_I_XEVALCAR corresponds to EVALCAR, but uses ceval *or* deval depending |
434f2f7a | 2613 | * on the debugging mode. |
62360b89 DH |
2614 | * |
2615 | * The main motivation for keeping this plethora is efficiency | |
2616 | * together with maintainability (=> locality of code). | |
2617 | */ | |
2618 | ||
434f2f7a DH |
2619 | static SCM ceval (SCM x, SCM env); |
2620 | static SCM deval (SCM x, SCM env); | |
2621 | #define CEVAL ceval | |
2622 | ||
62360b89 | 2623 | |
385609b9 | 2624 | #define SCM_I_EVALIM2(x) \ |
bc36d050 | 2625 | ((scm_is_eq ((x), SCM_EOL) \ |
62360b89 DH |
2626 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ |
2627 | : 0), \ | |
2628 | (x)) | |
2629 | ||
385609b9 | 2630 | #define SCM_I_EVALIM(x, env) (SCM_ILOCP (x) \ |
434f2f7a | 2631 | ? *scm_ilookup ((x), (env)) \ |
385609b9 | 2632 | : SCM_I_EVALIM2(x)) |
62360b89 | 2633 | |
385609b9 | 2634 | #define SCM_I_XEVAL(x, env) \ |
434f2f7a | 2635 | (SCM_IMP (x) \ |
385609b9 | 2636 | ? SCM_I_EVALIM2 (x) \ |
434f2f7a DH |
2637 | : (SCM_VARIABLEP (x) \ |
2638 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2639 | : (scm_is_pair (x) \ |
434f2f7a DH |
2640 | ? (scm_debug_mode_p \ |
2641 | ? deval ((x), (env)) \ | |
2642 | : ceval ((x), (env))) \ | |
2643 | : (x)))) | |
2644 | ||
385609b9 | 2645 | #define SCM_I_XEVALCAR(x, env) \ |
434f2f7a | 2646 | (SCM_IMP (SCM_CAR (x)) \ |
385609b9 | 2647 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2648 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2649 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2650 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a DH |
2651 | ? (scm_debug_mode_p \ |
2652 | ? deval (SCM_CAR (x), (env)) \ | |
2653 | : ceval (SCM_CAR (x), (env))) \ | |
cc95e00a | 2654 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2655 | ? SCM_CAR (x) \ |
2656 | : *scm_lookupcar ((x), (env), 1))))) | |
2657 | ||
2658 | #define EVAL(x, env) \ | |
2659 | (SCM_IMP (x) \ | |
385609b9 | 2660 | ? SCM_I_EVALIM ((x), (env)) \ |
434f2f7a DH |
2661 | : (SCM_VARIABLEP (x) \ |
2662 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2663 | : (scm_is_pair (x) \ |
434f2f7a DH |
2664 | ? CEVAL ((x), (env)) \ |
2665 | : (x)))) | |
2666 | ||
2667 | #define EVALCAR(x, env) \ | |
2668 | (SCM_IMP (SCM_CAR (x)) \ | |
385609b9 | 2669 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2670 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2671 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2672 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a | 2673 | ? CEVAL (SCM_CAR (x), (env)) \ |
cc95e00a | 2674 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2675 | ? SCM_CAR (x) \ |
2676 | : *scm_lookupcar ((x), (env), 1))))) | |
62360b89 | 2677 | |
d1138028 | 2678 | scm_i_pthread_mutex_t source_mutex; |
62360b89 DH |
2679 | |
2680 | ||
e5156567 DH |
2681 | /* Lookup a given local variable in an environment. The local variable is |
2682 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
2683 | * indicates the relative number of the environment frame (counting upwards | |
2684 | * from the innermost environment frame), binding indicates the number of the | |
2685 | * binding within the frame, and last? (which is extracted from the iloc using | |
2686 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
2687 | * very end of the improper list of bindings. */ | |
2688 | SCM * | |
2689 | scm_ilookup (SCM iloc, SCM env) | |
2690 | { | |
2691 | unsigned int frame_nr = SCM_IFRAME (iloc); | |
2692 | unsigned int binding_nr = SCM_IDIST (iloc); | |
2693 | SCM frames = env; | |
2694 | SCM bindings; | |
2695 | ||
2696 | for (; 0 != frame_nr; --frame_nr) | |
2697 | frames = SCM_CDR (frames); | |
2698 | ||
2699 | bindings = SCM_CAR (frames); | |
2700 | for (; 0 != binding_nr; --binding_nr) | |
2701 | bindings = SCM_CDR (bindings); | |
2702 | ||
2703 | if (SCM_ICDRP (iloc)) | |
2704 | return SCM_CDRLOC (bindings); | |
2705 | return SCM_CARLOC (SCM_CDR (bindings)); | |
2706 | } | |
2707 | ||
2708 | ||
2709 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
2710 | ||
2711 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
2d0c133f MV |
2712 | static void error_defined_variable (SCM symbol) SCM_NORETURN; |
2713 | ||
2714 | /* Call this for variables that are unfound. | |
2715 | */ | |
e5156567 DH |
2716 | static void |
2717 | error_unbound_variable (SCM symbol) | |
2718 | { | |
2719 | scm_error (scm_unbound_variable_key, NULL, | |
2720 | "Unbound variable: ~S", | |
2721 | scm_list_1 (symbol), SCM_BOOL_F); | |
2722 | } | |
2723 | ||
2d0c133f MV |
2724 | /* Call this for variables that are found but contain SCM_UNDEFINED. |
2725 | */ | |
2726 | static void | |
2727 | error_defined_variable (SCM symbol) | |
2728 | { | |
2729 | /* We use the 'unbound-variable' key here as well, since it | |
2730 | basically is the same kind of error, with a slight variation in | |
2731 | the displayed message. | |
2732 | */ | |
2733 | scm_error (scm_unbound_variable_key, NULL, | |
a03bad87 | 2734 | "Variable used before given a value: ~S", |
2d0c133f MV |
2735 | scm_list_1 (symbol), SCM_BOOL_F); |
2736 | } | |
2737 | ||
e5156567 DH |
2738 | |
2739 | /* The Lookup Car Race | |
2740 | - by Eva Luator | |
2741 | ||
2742 | Memoization of variables and special forms is done while executing | |
2743 | the code for the first time. As long as there is only one thread | |
2744 | everything is fine, but as soon as two threads execute the same | |
2745 | code concurrently `for the first time' they can come into conflict. | |
2746 | ||
2747 | This memoization includes rewriting variable references into more | |
2748 | efficient forms and expanding macros. Furthermore, macro expansion | |
2749 | includes `compiling' special forms like `let', `cond', etc. into | |
2750 | tree-code instructions. | |
2751 | ||
2752 | There shouldn't normally be a problem with memoizing local and | |
2753 | global variable references (into ilocs and variables), because all | |
2754 | threads will mutate the code in *exactly* the same way and (if I | |
2755 | read the C code correctly) it is not possible to observe a half-way | |
2756 | mutated cons cell. The lookup procedure can handle this | |
2757 | transparently without any critical sections. | |
2758 | ||
2759 | It is different with macro expansion, because macro expansion | |
2760 | happens outside of the lookup procedure and can't be | |
2761 | undone. Therefore the lookup procedure can't cope with it. It has | |
2762 | to indicate failure when it detects a lost race and hope that the | |
2763 | caller can handle it. Luckily, it turns out that this is the case. | |
2764 | ||
2765 | An example to illustrate this: Suppose that the following form will | |
2766 | be memoized concurrently by two threads | |
2767 | ||
2768 | (let ((x 12)) x) | |
2769 | ||
2770 | Let's first examine the lookup of X in the body. The first thread | |
2771 | decides that it has to find the symbol "x" in the environment and | |
2772 | starts to scan it. Then the other thread takes over and actually | |
2773 | overtakes the first. It looks up "x" and substitutes an | |
2774 | appropriate iloc for it. Now the first thread continues and | |
2775 | completes its lookup. It comes to exactly the same conclusions as | |
2776 | the second one and could - without much ado - just overwrite the | |
2777 | iloc with the same iloc. | |
2778 | ||
2779 | But let's see what will happen when the race occurs while looking | |
2780 | up the symbol "let" at the start of the form. It could happen that | |
2781 | the second thread interrupts the lookup of the first thread and not | |
2782 | only substitutes a variable for it but goes right ahead and | |
2783 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
2784 | the first thread completes its lookup, it would replace the #@let* | |
2785 | with a variable containing the "let" binding, effectively reverting | |
2786 | the form to (let (x 12) x). This is wrong. It has to detect that | |
2787 | it has lost the race and the evaluator has to reconsider the | |
2788 | changed form completely. | |
2789 | ||
2790 | This race condition could be resolved with some kind of traffic | |
2791 | light (like mutexes) around scm_lookupcar, but I think that it is | |
2792 | best to avoid them in this case. They would serialize memoization | |
2793 | completely and because lookup involves calling arbitrary Scheme | |
2794 | code (via the lookup-thunk), threads could be blocked for an | |
2795 | arbitrary amount of time or even deadlock. But with the current | |
2796 | solution a lot of unnecessary work is potentially done. */ | |
2797 | ||
2798 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to | |
2799 | return NULL to indicate a failed lookup due to some race conditions | |
2800 | between threads. This only happens when VLOC is the first cell of | |
2801 | a special form that will eventually be memoized (like `let', etc.) | |
2802 | In that case the whole lookup is bogus and the caller has to | |
2803 | reconsider the complete special form. | |
2804 | ||
2805 | SCM_LOOKUPCAR is still there, of course. It just calls | |
2806 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR | |
2807 | should only be called when it is known that VLOC is not the first | |
2808 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
2809 | for NULL. I think I've found the only places where this | |
2810 | applies. */ | |
2811 | ||
2812 | static SCM * | |
2813 | scm_lookupcar1 (SCM vloc, SCM genv, int check) | |
2814 | { | |
2815 | SCM env = genv; | |
2816 | register SCM *al, fl, var = SCM_CAR (vloc); | |
2817 | register SCM iloc = SCM_ILOC00; | |
2818 | for (; SCM_NIMP (env); env = SCM_CDR (env)) | |
2819 | { | |
a61f4e0c | 2820 | if (!scm_is_pair (SCM_CAR (env))) |
e5156567 DH |
2821 | break; |
2822 | al = SCM_CARLOC (env); | |
2823 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) | |
2824 | { | |
a61f4e0c | 2825 | if (!scm_is_pair (fl)) |
e5156567 | 2826 | { |
bc36d050 | 2827 | if (scm_is_eq (fl, var)) |
e5156567 | 2828 | { |
bc36d050 | 2829 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2830 | goto race; |
2831 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); | |
2832 | return SCM_CDRLOC (*al); | |
2833 | } | |
2834 | else | |
2835 | break; | |
2836 | } | |
2837 | al = SCM_CDRLOC (*al); | |
bc36d050 | 2838 | if (scm_is_eq (SCM_CAR (fl), var)) |
e5156567 DH |
2839 | { |
2840 | if (SCM_UNBNDP (SCM_CAR (*al))) | |
2d0c133f | 2841 | error_defined_variable (var); |
bc36d050 | 2842 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2843 | goto race; |
2844 | SCM_SETCAR (vloc, iloc); | |
2845 | return SCM_CARLOC (*al); | |
2846 | } | |
2847 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); | |
2848 | } | |
2849 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); | |
2850 | } | |
2851 | { | |
2852 | SCM top_thunk, real_var; | |
2853 | if (SCM_NIMP (env)) | |
2854 | { | |
2855 | top_thunk = SCM_CAR (env); /* env now refers to a | |
2856 | top level env thunk */ | |
2857 | env = SCM_CDR (env); | |
2858 | } | |
2859 | else | |
2860 | top_thunk = SCM_BOOL_F; | |
2861 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); | |
7888309b | 2862 | if (scm_is_false (real_var)) |
e5156567 DH |
2863 | goto errout; |
2864 | ||
a61f4e0c | 2865 | if (!scm_is_null (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
e5156567 DH |
2866 | { |
2867 | errout: | |
2868 | if (check) | |
2869 | { | |
a61f4e0c | 2870 | if (scm_is_null (env)) |
e5156567 DH |
2871 | error_unbound_variable (var); |
2872 | else | |
2873 | scm_misc_error (NULL, "Damaged environment: ~S", | |
2874 | scm_list_1 (var)); | |
2875 | } | |
2876 | else | |
2877 | { | |
2878 | /* A variable could not be found, but we shall | |
2879 | not throw an error. */ | |
2880 | static SCM undef_object = SCM_UNDEFINED; | |
2881 | return &undef_object; | |
2882 | } | |
2883 | } | |
2884 | ||
bc36d050 | 2885 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2886 | { |
2887 | /* Some other thread has changed the very cell we are working | |
2888 | on. In effect, it must have done our job or messed it up | |
2889 | completely. */ | |
2890 | race: | |
2891 | var = SCM_CAR (vloc); | |
2892 | if (SCM_VARIABLEP (var)) | |
2893 | return SCM_VARIABLE_LOC (var); | |
2894 | if (SCM_ILOCP (var)) | |
2895 | return scm_ilookup (var, genv); | |
2896 | /* We can't cope with anything else than variables and ilocs. When | |
2897 | a special form has been memoized (i.e. `let' into `#@let') we | |
2898 | return NULL and expect the calling function to do the right | |
2899 | thing. For the evaluator, this means going back and redoing | |
2900 | the dispatch on the car of the form. */ | |
2901 | return NULL; | |
2902 | } | |
2903 | ||
2904 | SCM_SETCAR (vloc, real_var); | |
2905 | return SCM_VARIABLE_LOC (real_var); | |
2906 | } | |
2907 | } | |
2908 | ||
2909 | SCM * | |
2910 | scm_lookupcar (SCM vloc, SCM genv, int check) | |
2911 | { | |
2912 | SCM *loc = scm_lookupcar1 (vloc, genv, check); | |
2913 | if (loc == NULL) | |
2914 | abort (); | |
2915 | return loc; | |
2916 | } | |
2917 | ||
2918 | ||
36245b66 DH |
2919 | /* During execution, look up a symbol in the top level of the given local |
2920 | * environment and return the corresponding variable object. If no binding | |
2921 | * for the symbol can be found, an 'Unbound variable' error is signalled. */ | |
2922 | static SCM | |
2923 | lazy_memoize_variable (const SCM symbol, const SCM environment) | |
2924 | { | |
2925 | const SCM top_level = scm_env_top_level (environment); | |
2926 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
2927 | ||
7888309b | 2928 | if (scm_is_false (variable)) |
36245b66 DH |
2929 | error_unbound_variable (symbol); |
2930 | else | |
2931 | return variable; | |
2932 | } | |
2933 | ||
2934 | ||
62360b89 DH |
2935 | SCM |
2936 | scm_eval_car (SCM pair, SCM env) | |
2937 | { | |
385609b9 | 2938 | return SCM_I_XEVALCAR (pair, env); |
62360b89 DH |
2939 | } |
2940 | ||
2941 | ||
6dbd0af5 | 2942 | SCM |
6e8d25a6 | 2943 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2944 | { |
680ed4a8 | 2945 | SCM results = SCM_EOL, *lloc = &results, res; |
a61f4e0c | 2946 | while (scm_is_pair (l)) |
6dbd0af5 | 2947 | { |
680ed4a8 | 2948 | res = EVALCAR (l, env); |
904a077d | 2949 | |
8ea46249 | 2950 | *lloc = scm_list_1 (res); |
a23afe53 | 2951 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2952 | l = SCM_CDR (l); |
2953 | } | |
a61f4e0c | 2954 | if (!scm_is_null (l)) |
904a077d | 2955 | scm_wrong_num_args (proc); |
680ed4a8 | 2956 | return results; |
6dbd0af5 | 2957 | } |
c4ac4d88 | 2958 | |
d0b07b5d | 2959 | |
9de33deb MD |
2960 | SCM |
2961 | scm_eval_body (SCM code, SCM env) | |
2962 | { | |
2963 | SCM next; | |
434f2f7a | 2964 | |
9de33deb | 2965 | again: |
01f11e02 | 2966 | next = SCM_CDR (code); |
a61f4e0c | 2967 | while (!scm_is_null (next)) |
9de33deb MD |
2968 | { |
2969 | if (SCM_IMP (SCM_CAR (code))) | |
2970 | { | |
2971 | if (SCM_ISYMP (SCM_CAR (code))) | |
2972 | { | |
cce0e9c8 | 2973 | scm_dynwind_begin (0); |
2b829bbb | 2974 | scm_i_dynwind_pthread_mutex_lock (&source_mutex); |
9bc4701c MD |
2975 | /* check for race condition */ |
2976 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2977 | m_expand_body (code, env); |
cce0e9c8 | 2978 | scm_dynwind_end (); |
9de33deb MD |
2979 | goto again; |
2980 | } | |
2981 | } | |
2982 | else | |
385609b9 | 2983 | SCM_I_XEVAL (SCM_CAR (code), env); |
9de33deb | 2984 | code = next; |
01f11e02 | 2985 | next = SCM_CDR (code); |
9de33deb | 2986 | } |
385609b9 | 2987 | return SCM_I_XEVALCAR (code, env); |
9de33deb MD |
2988 | } |
2989 | ||
0f2d19dd JB |
2990 | #endif /* !DEVAL */ |
2991 | ||
6dbd0af5 MD |
2992 | |
2993 | /* SECTION: This code is specific for the debugging support. One | |
2994 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2995 | * defined. | |
2996 | */ | |
2997 | ||
2998 | #ifndef DEVAL | |
2999 | ||
3000 | #define SCM_APPLY scm_apply | |
3001 | #define PREP_APPLY(proc, args) | |
3002 | #define ENTER_APPLY | |
ddea3325 | 3003 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
3004 | #ifdef STACK_CHECKING |
3005 | #ifndef NO_CEVAL_STACK_CHECKING | |
3006 | #define EVAL_STACK_CHECKING | |
3007 | #endif | |
6dbd0af5 MD |
3008 | #endif |
3009 | ||
3010 | #else /* !DEVAL */ | |
3011 | ||
434f2f7a DH |
3012 | #undef CEVAL |
3013 | #define CEVAL deval /* Substitute all uses of ceval */ | |
3014 | ||
0f2d19dd JB |
3015 | #undef SCM_APPLY |
3016 | #define SCM_APPLY scm_dapply | |
434f2f7a | 3017 | |
6dbd0af5 MD |
3018 | #undef PREP_APPLY |
3019 | #define PREP_APPLY(p, l) \ | |
3020 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
434f2f7a | 3021 | |
6dbd0af5 MD |
3022 | #undef ENTER_APPLY |
3023 | #define ENTER_APPLY \ | |
d3a6bc94 | 3024 | do { \ |
b7ff98dd | 3025 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 3026 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b0763985 | 3027 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && SCM_PROCTRACEP (proc)))\ |
6dbd0af5 | 3028 | {\ |
7888309b | 3029 | SCM tmp, tail = scm_from_bool(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 3030 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 3031 | SCM_TRAPS_P = 0;\ |
7c9c0169 NJ |
3032 | tmp = scm_make_debugobj (&debug);\ |
3033 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ | |
d95c0b76 | 3034 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 3035 | }\ |
d3a6bc94 | 3036 | } while (0) |
434f2f7a | 3037 | |
0f2d19dd | 3038 | #undef RETURN |
ddea3325 | 3039 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
434f2f7a | 3040 | |
b7ff98dd MD |
3041 | #ifdef STACK_CHECKING |
3042 | #ifndef EVAL_STACK_CHECKING | |
3043 | #define EVAL_STACK_CHECKING | |
3044 | #endif | |
6dbd0af5 MD |
3045 | #endif |
3046 | ||
0f2d19dd | 3047 | |
434f2f7a DH |
3048 | /* scm_last_debug_frame contains a pointer to the last debugging information |
3049 | * stack frame. It is accessed very often from the debugging evaluator, so it | |
3050 | * should probably not be indirectly addressed. Better to save and restore it | |
3051 | * from the current root at any stack swaps. | |
6dbd0af5 MD |
3052 | */ |
3053 | ||
6dbd0af5 MD |
3054 | /* scm_debug_eframe_size is the number of slots available for pseudo |
3055 | * stack frames at each real stack frame. | |
3056 | */ | |
3057 | ||
c014a02e | 3058 | long scm_debug_eframe_size; |
6dbd0af5 | 3059 | |
434f2f7a DH |
3060 | int scm_debug_mode_p; |
3061 | int scm_check_entry_p; | |
3062 | int scm_check_apply_p; | |
3063 | int scm_check_exit_p; | |
6dbd0af5 | 3064 | |
c014a02e | 3065 | long scm_eval_stack; |
a74145b8 | 3066 | |
92c2555f | 3067 | scm_t_option scm_eval_opts[] = { |
62560650 HWN |
3068 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." }, |
3069 | { 0 } | |
33b97402 MD |
3070 | }; |
3071 | ||
92c2555f | 3072 | scm_t_option scm_debug_opts[] = { |
b7ff98dd | 3073 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
7c9c0169 | 3074 | "*This option is now obsolete. Setting it has no effect." }, |
b7ff98dd MD |
3075 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, |
3076 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
3077 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
3078 | "Record procedure names at definition." }, | |
3079 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
3080 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 3081 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
3082 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
3083 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 3084 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
3085 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
3086 | "Maximal number of stored backtrace frames." }, | |
3087 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
3088 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
3089 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 3090 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
65bc1f7a | 3091 | { 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."}, |
62560650 HWN |
3092 | { SCM_OPTION_BOOLEAN, "warn-deprecated", 0, "Warn when deprecated features are used." }, |
3093 | { 0 }, | |
6dbd0af5 MD |
3094 | }; |
3095 | ||
62560650 HWN |
3096 | |
3097 | ||
92c2555f | 3098 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 3099 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd | 3100 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
d95c0b76 | 3101 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, |
62560650 | 3102 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, |
d95c0b76 | 3103 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, |
62560650 HWN |
3104 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
3105 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." }, | |
3106 | { 0 } | |
6dbd0af5 MD |
3107 | }; |
3108 | ||
a1ec6916 | 3109 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 3110 | (SCM setting), |
b3f26b14 MG |
3111 | "Option interface for the evaluation options. Instead of using\n" |
3112 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 3113 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 3114 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
3115 | { |
3116 | SCM ans; | |
876099d4 | 3117 | |
661ae7ab MV |
3118 | scm_dynwind_begin (0); |
3119 | scm_dynwind_critical_section (SCM_BOOL_F); | |
33b97402 MD |
3120 | ans = scm_options (setting, |
3121 | scm_eval_opts, | |
1bbd0b84 | 3122 | FUNC_NAME); |
a74145b8 | 3123 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
661ae7ab | 3124 | scm_dynwind_end (); |
876099d4 | 3125 | |
33b97402 MD |
3126 | return ans; |
3127 | } | |
1bbd0b84 | 3128 | #undef FUNC_NAME |
33b97402 | 3129 | |
d0b07b5d | 3130 | |
a1ec6916 | 3131 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 3132 | (SCM setting), |
b3f26b14 | 3133 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 3134 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
3135 | { |
3136 | SCM ans; | |
9de87eea | 3137 | SCM_CRITICAL_SECTION_START; |
33b97402 MD |
3138 | ans = scm_options (setting, |
3139 | scm_evaluator_trap_table, | |
1bbd0b84 | 3140 | FUNC_NAME); |
2b0fb0a5 | 3141 | /* njrev: same again. */ |
33b97402 | 3142 | SCM_RESET_DEBUG_MODE; |
9de87eea | 3143 | SCM_CRITICAL_SECTION_END; |
33b97402 MD |
3144 | return ans; |
3145 | } | |
1bbd0b84 | 3146 | #undef FUNC_NAME |
33b97402 | 3147 | |
d0b07b5d | 3148 | |
24933780 | 3149 | static SCM |
a392ee15 | 3150 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 3151 | { |
b1cb24ff | 3152 | SCM *results = lloc; |
a61f4e0c | 3153 | while (scm_is_pair (l)) |
0f2d19dd | 3154 | { |
b1cb24ff | 3155 | const SCM res = EVALCAR (l, env); |
904a077d | 3156 | |
8ea46249 | 3157 | *lloc = scm_list_1 (res); |
a23afe53 | 3158 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
3159 | l = SCM_CDR (l); |
3160 | } | |
a61f4e0c | 3161 | if (!scm_is_null (l)) |
904a077d | 3162 | scm_wrong_num_args (proc); |
680ed4a8 | 3163 | return *results; |
0f2d19dd JB |
3164 | } |
3165 | ||
5defc05d NJ |
3166 | static void |
3167 | eval_letrec_inits (SCM env, SCM init_forms, SCM **init_values_eol) | |
3168 | { | |
3169 | SCM argv[10]; | |
3170 | int i = 0, imax = sizeof (argv) / sizeof (SCM); | |
3171 | ||
3172 | while (!scm_is_null (init_forms)) | |
3173 | { | |
3174 | if (imax == i) | |
3175 | { | |
3176 | eval_letrec_inits (env, init_forms, init_values_eol); | |
3177 | break; | |
3178 | } | |
3179 | argv[i++] = EVALCAR (init_forms, env); | |
3180 | init_forms = SCM_CDR (init_forms); | |
3181 | } | |
3182 | ||
3183 | for (i--; i >= 0; i--) | |
3184 | { | |
3185 | **init_values_eol = scm_list_1 (argv[i]); | |
3186 | *init_values_eol = SCM_CDRLOC (**init_values_eol); | |
3187 | } | |
3188 | } | |
3189 | ||
6dbd0af5 MD |
3190 | #endif /* !DEVAL */ |
3191 | ||
3192 | ||
a392ee15 | 3193 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
3194 | */ |
3195 | ||
a392ee15 | 3196 | |
d9d39d76 | 3197 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 3198 | * current module. */ |
d9d39d76 MV |
3199 | #define UPDATE_TOPLEVEL_ENV(env) \ |
3200 | do { \ | |
3201 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 3202 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
3203 | env = scm_top_level_env (p); \ |
3204 | } while (0) | |
3205 | ||
6dbd0af5 | 3206 | |
6f81708a | 3207 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
bc36d050 | 3208 | ASSERT_SYNTAX (!scm_is_eq ((x), SCM_EOL), s_empty_combination, x) |
6f81708a DH |
3209 | |
3210 | ||
a392ee15 DH |
3211 | /* This is the evaluator. Like any real monster, it has three heads: |
3212 | * | |
434f2f7a DH |
3213 | * ceval is the non-debugging evaluator, deval is the debugging version. Both |
3214 | * are implemented using a common code base, using the following mechanism: | |
3215 | * CEVAL is a macro, which is either defined to ceval or deval. Thus, there | |
3216 | * is no function CEVAL, but the code for CEVAL actually compiles to either | |
3217 | * ceval or deval. When CEVAL is defined to ceval, it is known that the macro | |
3218 | * DEVAL is not defined. When CEVAL is defined to deval, then the macro DEVAL | |
3219 | * is known to be defined. Thus, in CEVAL parts for the debugging evaluator | |
a392ee15 DH |
3220 | * are enclosed within #ifdef DEVAL ... #endif. |
3221 | * | |
434f2f7a DH |
3222 | * All three (ceval, deval and their common implementation CEVAL) take two |
3223 | * input parameters, x and env: x is a single expression to be evalutated. | |
3224 | * env is the environment in which bindings are searched. | |
a392ee15 | 3225 | * |
434f2f7a DH |
3226 | * x is known to be a pair. Since x is a single expression, it is necessarily |
3227 | * in a tail position. If x is just a call to another function like in the | |
3228 | * expression (foo exp1 exp2 ...), the realization of that call therefore | |
3229 | * _must_not_ increase stack usage (the evaluation of exp1, exp2 etc., | |
3230 | * however, may do so). This is realized by making extensive use of 'goto' | |
3231 | * statements within the evaluator: The gotos replace recursive calls to | |
3232 | * CEVAL, thus re-using the same stack frame that CEVAL was already using. | |
3233 | * If, however, x represents some form that requires to evaluate a sequence of | |
3234 | * expressions like (begin exp1 exp2 ...), then recursive calls to CEVAL are | |
3235 | * performed for all but the last expression of that sequence. */ | |
6dbd0af5 | 3236 | |
434f2f7a DH |
3237 | static SCM |
3238 | CEVAL (SCM x, SCM env) | |
0f2d19dd | 3239 | { |
42030fb2 | 3240 | SCM proc, arg1; |
6dbd0af5 | 3241 | #ifdef DEVAL |
92c2555f MV |
3242 | scm_t_debug_frame debug; |
3243 | scm_t_debug_info *debug_info_end; | |
9de87eea | 3244 | debug.prev = scm_i_last_debug_frame (); |
020c890c | 3245 | debug.status = 0; |
04b6c081 | 3246 | /* |
92c2555f | 3247 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
3248 | * user has specified with (debug-set! frames <n>). |
3249 | * | |
3250 | * Even frames are eval frames, odd frames are apply frames. | |
3251 | */ | |
92c2555f | 3252 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 3253 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
3254 | debug.info = debug.vect; |
3255 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
9de87eea | 3256 | scm_i_set_last_debug_frame (&debug); |
6dbd0af5 | 3257 | #endif |
b7ff98dd | 3258 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 3259 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 3260 | { |
b7ff98dd | 3261 | #ifdef DEVAL |
6dbd0af5 MD |
3262 | debug.info->e.exp = x; |
3263 | debug.info->e.env = env; | |
b7ff98dd | 3264 | #endif |
6dbd0af5 MD |
3265 | scm_report_stack_overflow (); |
3266 | } | |
3267 | #endif | |
6a0f6ff3 | 3268 | |
6dbd0af5 MD |
3269 | #ifdef DEVAL |
3270 | goto start; | |
3271 | #endif | |
6a0f6ff3 | 3272 | |
6dbd0af5 MD |
3273 | loop: |
3274 | #ifdef DEVAL | |
b7ff98dd MD |
3275 | SCM_CLEAR_ARGSREADY (debug); |
3276 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 3277 | --debug.info; |
04b6c081 MD |
3278 | /* |
3279 | * In theory, this should be the only place where it is necessary to | |
3280 | * check for space in debug.vect since both eval frames and | |
3281 | * available space are even. | |
3282 | * | |
3283 | * For this to be the case, however, it is necessary that primitive | |
3284 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 3285 | * label call PREP_APPLY. |
04b6c081 | 3286 | */ |
c0ab1b8d | 3287 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 3288 | { |
b7ff98dd | 3289 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
3290 | debug.info -= 2; |
3291 | } | |
6a0f6ff3 | 3292 | |
6dbd0af5 MD |
3293 | start: |
3294 | debug.info->e.exp = x; | |
3295 | debug.info->e.env = env; | |
5132eef0 DH |
3296 | if (scm_check_entry_p && SCM_TRAPS_P) |
3297 | { | |
bc76d628 DH |
3298 | if (SCM_ENTER_FRAME_P |
3299 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 3300 | { |
bc76d628 | 3301 | SCM stackrep; |
7888309b | 3302 | SCM tail = scm_from_bool (SCM_TAILRECP (debug)); |
5132eef0 | 3303 | SCM_SET_TAILREC (debug); |
7c9c0169 | 3304 | stackrep = scm_make_debugobj (&debug); |
5132eef0 | 3305 | SCM_TRAPS_P = 0; |
7c9c0169 NJ |
3306 | stackrep = scm_call_4 (SCM_ENTER_FRAME_HDLR, |
3307 | scm_sym_enter_frame, | |
3308 | stackrep, | |
3309 | tail, | |
3310 | unmemoize_expression (x, env)); | |
5132eef0 | 3311 | SCM_TRAPS_P = 1; |
7c9c0169 NJ |
3312 | if (scm_is_pair (stackrep) && |
3313 | scm_is_eq (SCM_CAR (stackrep), sym_instead)) | |
3314 | { | |
3315 | /* This gives the possibility for the debugger to modify | |
3316 | the source expression before evaluation. */ | |
3317 | x = SCM_CDR (stackrep); | |
3318 | if (SCM_IMP (x)) | |
3319 | RETURN (x); | |
3320 | } | |
5132eef0 DH |
3321 | } |
3322 | } | |
6dbd0af5 | 3323 | #endif |
f8769b1d | 3324 | dispatch: |
9cb5124f | 3325 | SCM_TICK; |
dec40cd2 | 3326 | if (SCM_ISYMP (SCM_CAR (x))) |
0f2d19dd | 3327 | { |
7e6e6b37 | 3328 | switch (ISYMNUM (SCM_CAR (x))) |
dec40cd2 | 3329 | { |
7e6e6b37 | 3330 | case (ISYMNUM (SCM_IM_AND)): |
dec40cd2 | 3331 | x = SCM_CDR (x); |
a61f4e0c | 3332 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3333 | { |
3334 | SCM test_result = EVALCAR (x, env); | |
7888309b | 3335 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3336 | RETURN (SCM_BOOL_F); |
3337 | else | |
3338 | x = SCM_CDR (x); | |
3339 | } | |
3340 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3341 | goto carloop; | |
0f2d19dd | 3342 | |
7e6e6b37 | 3343 | case (ISYMNUM (SCM_IM_BEGIN)): |
dec40cd2 | 3344 | x = SCM_CDR (x); |
a61f4e0c | 3345 | if (scm_is_null (x)) |
dec40cd2 | 3346 | RETURN (SCM_UNSPECIFIED); |
b8113bc8 | 3347 | |
dec40cd2 | 3348 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd | 3349 | |
dec40cd2 DH |
3350 | begin: |
3351 | /* If we are on toplevel with a lookup closure, we need to sync | |
3352 | with the current module. */ | |
a61f4e0c | 3353 | if (scm_is_pair (env) && !scm_is_pair (SCM_CAR (env))) |
dec40cd2 DH |
3354 | { |
3355 | UPDATE_TOPLEVEL_ENV (env); | |
a61f4e0c | 3356 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3357 | { |
3358 | EVALCAR (x, env); | |
3359 | UPDATE_TOPLEVEL_ENV (env); | |
3360 | x = SCM_CDR (x); | |
3361 | } | |
3362 | goto carloop; | |
3363 | } | |
3364 | else | |
3365 | goto nontoplevel_begin; | |
5280aaca | 3366 | |
dec40cd2 | 3367 | nontoplevel_begin: |
a61f4e0c | 3368 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 | 3369 | { |
b1cb24ff | 3370 | const SCM form = SCM_CAR (x); |
dec40cd2 DH |
3371 | if (SCM_IMP (form)) |
3372 | { | |
3373 | if (SCM_ISYMP (form)) | |
3374 | { | |
cce0e9c8 | 3375 | scm_dynwind_begin (0); |
2b829bbb | 3376 | scm_i_dynwind_pthread_mutex_lock (&source_mutex); |
dec40cd2 DH |
3377 | /* check for race condition */ |
3378 | if (SCM_ISYMP (SCM_CAR (x))) | |
3379 | m_expand_body (x, env); | |
cce0e9c8 | 3380 | scm_dynwind_end (); |
dec40cd2 DH |
3381 | goto nontoplevel_begin; |
3382 | } | |
3383 | else | |
3384 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); | |
3385 | } | |
3386 | else | |
b1cb24ff | 3387 | (void) EVAL (form, env); |
dec40cd2 DH |
3388 | x = SCM_CDR (x); |
3389 | } | |
b1cb24ff | 3390 | |
dec40cd2 DH |
3391 | carloop: |
3392 | { | |
3393 | /* scm_eval last form in list */ | |
b1cb24ff | 3394 | const SCM last_form = SCM_CAR (x); |
0f2d19dd | 3395 | |
a61f4e0c | 3396 | if (scm_is_pair (last_form)) |
dec40cd2 DH |
3397 | { |
3398 | /* This is by far the most frequent case. */ | |
3399 | x = last_form; | |
3400 | goto loop; /* tail recurse */ | |
3401 | } | |
3402 | else if (SCM_IMP (last_form)) | |
385609b9 | 3403 | RETURN (SCM_I_EVALIM (last_form, env)); |
dec40cd2 DH |
3404 | else if (SCM_VARIABLEP (last_form)) |
3405 | RETURN (SCM_VARIABLE_REF (last_form)); | |
cc95e00a | 3406 | else if (scm_is_symbol (last_form)) |
dec40cd2 DH |
3407 | RETURN (*scm_lookupcar (x, env, 1)); |
3408 | else | |
3409 | RETURN (last_form); | |
3410 | } | |
0f2d19dd JB |
3411 | |
3412 | ||
7e6e6b37 | 3413 | case (ISYMNUM (SCM_IM_CASE)): |
dec40cd2 DH |
3414 | x = SCM_CDR (x); |
3415 | { | |
b1cb24ff | 3416 | const SCM key = EVALCAR (x, env); |
dec40cd2 | 3417 | x = SCM_CDR (x); |
a61f4e0c | 3418 | while (!scm_is_null (x)) |
dec40cd2 | 3419 | { |
b1cb24ff | 3420 | const SCM clause = SCM_CAR (x); |
dec40cd2 | 3421 | SCM labels = SCM_CAR (clause); |
bc36d050 | 3422 | if (scm_is_eq (labels, SCM_IM_ELSE)) |
dec40cd2 DH |
3423 | { |
3424 | x = SCM_CDR (clause); | |
3425 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3426 | goto begin; | |
3427 | } | |
a61f4e0c | 3428 | while (!scm_is_null (labels)) |
dec40cd2 | 3429 | { |
b1cb24ff | 3430 | const SCM label = SCM_CAR (labels); |
bc36d050 | 3431 | if (scm_is_eq (label, key) |
7888309b | 3432 | || scm_is_true (scm_eqv_p (label, key))) |
dec40cd2 DH |
3433 | { |
3434 | x = SCM_CDR (clause); | |
3435 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3436 | goto begin; | |
3437 | } | |
3438 | labels = SCM_CDR (labels); | |
3439 | } | |
3440 | x = SCM_CDR (x); | |
3441 | } | |
3442 | } | |
3443 | RETURN (SCM_UNSPECIFIED); | |
0f2d19dd JB |
3444 | |
3445 | ||
7e6e6b37 | 3446 | case (ISYMNUM (SCM_IM_COND)): |
dec40cd2 | 3447 | x = SCM_CDR (x); |
a61f4e0c | 3448 | while (!scm_is_null (x)) |
dec40cd2 | 3449 | { |
b1cb24ff | 3450 | const SCM clause = SCM_CAR (x); |
bc36d050 | 3451 | if (scm_is_eq (SCM_CAR (clause), SCM_IM_ELSE)) |
dec40cd2 DH |
3452 | { |
3453 | x = SCM_CDR (clause); | |
3454 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3455 | goto begin; | |
3456 | } | |
3457 | else | |
3458 | { | |
3459 | arg1 = EVALCAR (clause, env); | |
1fe1fc0a MV |
3460 | /* SRFI 61 extended cond */ |
3461 | if (!scm_is_null (SCM_CDR (clause)) | |
3462 | && !scm_is_null (SCM_CDDR (clause)) | |
3463 | && scm_is_eq (SCM_CADDR (clause), SCM_IM_ARROW)) | |
3464 | { | |
3465 | SCM xx, guard_result; | |
3466 | if (SCM_VALUESP (arg1)) | |
3467 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3468 | else | |
3469 | arg1 = scm_list_1 (arg1); | |
3470 | xx = SCM_CDR (clause); | |
3471 | proc = EVALCAR (xx, env); | |
3472 | guard_result = SCM_APPLY (proc, arg1, SCM_EOL); | |
3473 | if (scm_is_true (guard_result) | |
3474 | && !SCM_NILP (guard_result)) | |
3475 | { | |
3476 | proc = SCM_CDDR (xx); | |
3477 | proc = EVALCAR (proc, env); | |
3478 | PREP_APPLY (proc, arg1); | |
3479 | goto apply_proc; | |
3480 | } | |
3481 | } | |
3482 | else if (scm_is_true (arg1) && !SCM_NILP (arg1)) | |
dec40cd2 DH |
3483 | { |
3484 | x = SCM_CDR (clause); | |
a61f4e0c | 3485 | if (scm_is_null (x)) |
dec40cd2 | 3486 | RETURN (arg1); |
bc36d050 | 3487 | else if (!scm_is_eq (SCM_CAR (x), SCM_IM_ARROW)) |
dec40cd2 DH |
3488 | { |
3489 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3490 | goto begin; | |
3491 | } | |
3492 | else | |
3493 | { | |
3494 | proc = SCM_CDR (x); | |
3495 | proc = EVALCAR (proc, env); | |
3496 | PREP_APPLY (proc, scm_list_1 (arg1)); | |
3497 | ENTER_APPLY; | |
3498 | goto evap1; | |
3499 | } | |
3500 | } | |
3501 | x = SCM_CDR (x); | |
3502 | } | |
3503 | } | |
3504 | RETURN (SCM_UNSPECIFIED); | |
e5cb71a0 | 3505 | |
e5cb71a0 | 3506 | |
7e6e6b37 | 3507 | case (ISYMNUM (SCM_IM_DO)): |
dec40cd2 DH |
3508 | x = SCM_CDR (x); |
3509 | { | |
3510 | /* Compute the initialization values and the initial environment. */ | |
3511 | SCM init_forms = SCM_CAR (x); | |
3512 | SCM init_values = SCM_EOL; | |
a61f4e0c | 3513 | while (!scm_is_null (init_forms)) |
dec40cd2 DH |
3514 | { |
3515 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3516 | init_forms = SCM_CDR (init_forms); | |
3517 | } | |
3518 | x = SCM_CDR (x); | |
3519 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3520 | } | |
3521 | x = SCM_CDR (x); | |
3522 | { | |
3523 | SCM test_form = SCM_CAR (x); | |
3524 | SCM body_forms = SCM_CADR (x); | |
3525 | SCM step_forms = SCM_CDDR (x); | |
e5cb71a0 | 3526 | |
dec40cd2 | 3527 | SCM test_result = EVALCAR (test_form, env); |
e5cb71a0 | 3528 | |
7888309b | 3529 | while (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3530 | { |
3531 | { | |
3532 | /* Evaluate body forms. */ | |
3533 | SCM temp_forms; | |
3534 | for (temp_forms = body_forms; | |
a61f4e0c | 3535 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3536 | temp_forms = SCM_CDR (temp_forms)) |
3537 | { | |
3538 | SCM form = SCM_CAR (temp_forms); | |
b1cb24ff DH |
3539 | /* Dirk:FIXME: We only need to eval forms that may have |
3540 | * a side effect here. This is only true for forms that | |
3541 | * start with a pair. All others are just constants. | |
3542 | * Since with the current memoizer 'form' may hold a | |
3543 | * constant, we call EVAL here to handle the constant | |
3544 | * cases. In the long run it would make sense to have | |
3545 | * the macro transformer of 'do' eliminate all forms | |
3546 | * that have no sideeffect. Then instead of EVAL we | |
3547 | * could call CEVAL directly here. */ | |
3548 | (void) EVAL (form, env); | |
dec40cd2 DH |
3549 | } |
3550 | } | |
0f2d19dd | 3551 | |
dec40cd2 DH |
3552 | { |
3553 | /* Evaluate the step expressions. */ | |
3554 | SCM temp_forms; | |
3555 | SCM step_values = SCM_EOL; | |
3556 | for (temp_forms = step_forms; | |
a61f4e0c | 3557 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3558 | temp_forms = SCM_CDR (temp_forms)) |
3559 | { | |
b1cb24ff | 3560 | const SCM value = EVALCAR (temp_forms, env); |
dec40cd2 DH |
3561 | step_values = scm_cons (value, step_values); |
3562 | } | |
3563 | env = SCM_EXTEND_ENV (SCM_CAAR (env), | |
3564 | step_values, | |
3565 | SCM_CDR (env)); | |
3566 | } | |
0f2d19dd | 3567 | |
dec40cd2 DH |
3568 | test_result = EVALCAR (test_form, env); |
3569 | } | |
3570 | } | |
3571 | x = SCM_CDAR (x); | |
a61f4e0c | 3572 | if (scm_is_null (x)) |
dec40cd2 DH |
3573 | RETURN (SCM_UNSPECIFIED); |
3574 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3575 | goto nontoplevel_begin; | |
0f2d19dd JB |
3576 | |
3577 | ||
7e6e6b37 | 3578 | case (ISYMNUM (SCM_IM_IF)): |
dec40cd2 DH |
3579 | x = SCM_CDR (x); |
3580 | { | |
3581 | SCM test_result = EVALCAR (x, env); | |
3582 | x = SCM_CDR (x); /* then expression */ | |
7888309b | 3583 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3584 | { |
3585 | x = SCM_CDR (x); /* else expression */ | |
a61f4e0c | 3586 | if (scm_is_null (x)) |
dec40cd2 DH |
3587 | RETURN (SCM_UNSPECIFIED); |
3588 | } | |
3589 | } | |
3590 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3591 | goto carloop; | |
0f2d19dd JB |
3592 | |
3593 | ||
7e6e6b37 | 3594 | case (ISYMNUM (SCM_IM_LET)): |
dec40cd2 DH |
3595 | x = SCM_CDR (x); |
3596 | { | |
3597 | SCM init_forms = SCM_CADR (x); | |
3598 | SCM init_values = SCM_EOL; | |
3599 | do | |
3600 | { | |
3601 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3602 | init_forms = SCM_CDR (init_forms); | |
3603 | } | |
a61f4e0c | 3604 | while (!scm_is_null (init_forms)); |
dec40cd2 DH |
3605 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
3606 | } | |
3607 | x = SCM_CDDR (x); | |
3608 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3609 | goto nontoplevel_begin; | |
0f2d19dd JB |
3610 | |
3611 | ||
7e6e6b37 | 3612 | case (ISYMNUM (SCM_IM_LETREC)): |
dec40cd2 DH |
3613 | x = SCM_CDR (x); |
3614 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); | |
3615 | x = SCM_CDR (x); | |
3616 | { | |
3617 | SCM init_forms = SCM_CAR (x); | |
5defc05d NJ |
3618 | SCM init_values = scm_list_1 (SCM_BOOL_T); |
3619 | SCM *init_values_eol = SCM_CDRLOC (init_values); | |
3620 | eval_letrec_inits (env, init_forms, &init_values_eol); | |
3621 | SCM_SETCDR (SCM_CAR (env), SCM_CDR (init_values)); | |
dec40cd2 DH |
3622 | } |
3623 | x = SCM_CDR (x); | |
3624 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3625 | goto nontoplevel_begin; | |
0f2d19dd | 3626 | |
302c12b4 | 3627 | |
7e6e6b37 | 3628 | case (ISYMNUM (SCM_IM_LETSTAR)): |
dec40cd2 DH |
3629 | x = SCM_CDR (x); |
3630 | { | |
3631 | SCM bindings = SCM_CAR (x); | |
a61f4e0c | 3632 | if (!scm_is_null (bindings)) |
dec40cd2 DH |
3633 | { |
3634 | do | |
3635 | { | |
3636 | SCM name = SCM_CAR (bindings); | |
3637 | SCM init = SCM_CDR (bindings); | |
3638 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); | |
3639 | bindings = SCM_CDR (init); | |
3640 | } | |
a61f4e0c | 3641 | while (!scm_is_null (bindings)); |
dec40cd2 DH |
3642 | } |
3643 | } | |
3644 | x = SCM_CDR (x); | |
3645 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3646 | goto nontoplevel_begin; | |
0f2d19dd JB |
3647 | |
3648 | ||
7e6e6b37 | 3649 | case (ISYMNUM (SCM_IM_OR)): |
dec40cd2 | 3650 | x = SCM_CDR (x); |
a61f4e0c | 3651 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3652 | { |
3653 | SCM val = EVALCAR (x, env); | |
7888309b | 3654 | if (scm_is_true (val) && !SCM_NILP (val)) |
dec40cd2 DH |
3655 | RETURN (val); |
3656 | else | |
3657 | x = SCM_CDR (x); | |
3658 | } | |
3659 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3660 | goto carloop; | |
0f2d19dd JB |
3661 | |
3662 | ||
7e6e6b37 | 3663 | case (ISYMNUM (SCM_IM_LAMBDA)): |
dec40cd2 | 3664 | RETURN (scm_closure (SCM_CDR (x), env)); |
0f2d19dd JB |
3665 | |
3666 | ||
7e6e6b37 | 3667 | case (ISYMNUM (SCM_IM_QUOTE)): |
e7313a9d | 3668 | RETURN (SCM_CDR (x)); |
0f2d19dd JB |
3669 | |
3670 | ||
7e6e6b37 | 3671 | case (ISYMNUM (SCM_IM_SET_X)): |
dec40cd2 DH |
3672 | x = SCM_CDR (x); |
3673 | { | |
3674 | SCM *location; | |
3675 | SCM variable = SCM_CAR (x); | |
3676 | if (SCM_ILOCP (variable)) | |
3677 | location = scm_ilookup (variable, env); | |
3678 | else if (SCM_VARIABLEP (variable)) | |
3679 | location = SCM_VARIABLE_LOC (variable); | |
36245b66 DH |
3680 | else |
3681 | { | |
cc95e00a | 3682 | /* (scm_is_symbol (variable)) is known to be true */ |
36245b66 DH |
3683 | variable = lazy_memoize_variable (variable, env); |
3684 | SCM_SETCAR (x, variable); | |
3685 | location = SCM_VARIABLE_LOC (variable); | |
3686 | } | |
dec40cd2 DH |
3687 | x = SCM_CDR (x); |
3688 | *location = EVALCAR (x, env); | |
3689 | } | |
3690 | RETURN (SCM_UNSPECIFIED); | |
3f04400d DH |
3691 | |
3692 | ||
7e6e6b37 | 3693 | case (ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3694 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3695 | x = SCM_CDR (x); |
3696 | proc = EVALCAR (x, env); | |
3697 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3698 | |
3699 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3700 | x = SCM_CDR (x); |
3701 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3702 | |
3703 | apply_proc: | |
3704 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3705 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3706 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3707 | if (SCM_CLOSUREP (proc)) |
3708 | { | |
9a069bdd | 3709 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3710 | #ifdef DEVAL |
9a069bdd | 3711 | debug.info->a.args = arg1; |
6dbd0af5 | 3712 | #endif |
9a069bdd DH |
3713 | if (scm_badargsp (formals, arg1)) |
3714 | scm_wrong_num_args (proc); | |
3715 | ENTER_APPLY; | |
3716 | /* Copy argument list */ | |
3717 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3718 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3719 | else | |
3720 | { | |
3721 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3722 | SCM tail = args; | |
3723 | arg1 = SCM_CDR (arg1); | |
3724 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3725 | { | |
3726 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3727 | SCM_SETCDR (tail, new_tail); | |
3728 | tail = new_tail; | |
3729 | arg1 = SCM_CDR (arg1); | |
3730 | } | |
3731 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3732 | } | |
3733 | ||
3734 | x = SCM_CLOSURE_BODY (proc); | |
3735 | goto nontoplevel_begin; | |
0f2d19dd | 3736 | } |
3f04400d DH |
3737 | else |
3738 | { | |
e910e9d2 DH |
3739 | ENTER_APPLY; |
3740 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3741 | } |
3742 | ||
0f2d19dd | 3743 | |
7e6e6b37 | 3744 | case (ISYMNUM (SCM_IM_CONT)): |
5f144b10 GH |
3745 | { |
3746 | int first; | |
3747 | SCM val = scm_make_continuation (&first); | |
3748 | ||
e050d4f8 | 3749 | if (!first) |
5f144b10 | 3750 | RETURN (val); |
e050d4f8 DH |
3751 | else |
3752 | { | |
3753 | arg1 = val; | |
3754 | proc = SCM_CDR (x); | |
6bff1368 | 3755 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3756 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3757 | ENTER_APPLY; | |
e050d4f8 DH |
3758 | goto evap1; |
3759 | } | |
5f144b10 | 3760 | } |
e050d4f8 | 3761 | |
0f2d19dd | 3762 | |
7e6e6b37 | 3763 | case (ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3764 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3765 | |
2f263a6a MV |
3766 | #if 0 |
3767 | /* See futures.h for a comment why futures are not enabled. | |
3768 | */ | |
7e6e6b37 | 3769 | case (ISYMNUM (SCM_IM_FUTURE)): |
28d52ebb | 3770 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); |
2f263a6a | 3771 | #endif |
28d52ebb | 3772 | |
7e6e6b37 DH |
3773 | /* PLACEHOLDER for case (ISYMNUM (SCM_IM_DISPATCH)): The following |
3774 | code (type_dispatch) is intended to be the tail of the case | |
3775 | clause for the internal macro SCM_IM_DISPATCH. Please don't | |
3776 | remove it from this location without discussing it with Mikael | |
c8e1d354 MD |
3777 | <djurfeldt@nada.kth.se> */ |
3778 | ||
f12745b6 DH |
3779 | /* The type dispatch code is duplicated below |
3780 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3781 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3782 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3783 | /* Type dispatch means to determine from the types of the function |
3784 | * arguments (i. e. the 'signature' of the call), which method from | |
3785 | * a generic function is to be called. This process of selecting | |
3786 | * the right method takes some time. To speed it up, guile uses | |
3787 | * caching: Together with the macro call to dispatch the signatures | |
3788 | * of some previous calls to that generic function from the same | |
3789 | * place are stored (in the code!) in a cache that we call the | |
3790 | * 'method cache'. This is done since it is likely, that | |
3791 | * consecutive calls to dispatch from that position in the code will | |
3792 | * have the same signature. Thus, the type dispatch works as | |
3793 | * follows: First, determine a hash value from the signature of the | |
3794 | * actual arguments. Second, use this hash value as an index to | |
3795 | * find that same signature in the method cache stored at this | |
3796 | * position in the code. If found, you have also found the | |
3797 | * corresponding method that belongs to that signature. If the | |
3798 | * signature is not found in the method cache, you have to perform a | |
3799 | * full search over all signatures stored with the generic | |
3800 | * function. */ | |
3801 | { | |
3802 | unsigned long int specializers; | |
3803 | unsigned long int hash_value; | |
3804 | unsigned long int cache_end_pos; | |
3805 | unsigned long int mask; | |
3806 | SCM method_cache; | |
3807 | ||
3808 | { | |
3809 | SCM z = SCM_CDDR (x); | |
3810 | SCM tmp = SCM_CADR (z); | |
e11e83f3 | 3811 | specializers = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3812 | |
3813 | /* Compute a hash value for searching the method cache. There | |
3814 | * are two variants for computing the hash value, a (rather) | |
3815 | * complicated one, and a simple one. For the complicated one | |
3816 | * explained below, tmp holds a number that is used in the | |
3817 | * computation. */ | |
4057a3e0 | 3818 | if (scm_is_simple_vector (tmp)) |
e11e83f3 MV |
3819 | { |
3820 | /* This method of determining the hash value is much | |
3821 | * simpler: Set the hash value to zero and just perform a | |
3822 | * linear search through the method cache. */ | |
3823 | method_cache = tmp; | |
3824 | mask = (unsigned long int) ((long) -1); | |
3825 | hash_value = 0; | |
4057a3e0 | 3826 | cache_end_pos = SCM_SIMPLE_VECTOR_LENGTH (method_cache); |
e11e83f3 MV |
3827 | } |
3828 | else | |
f12745b6 DH |
3829 | { |
3830 | /* Use the signature of the actual arguments to determine | |
3831 | * the hash value. This is done as follows: Each class has | |
3832 | * an array of random numbers, that are determined when the | |
3833 | * class is created. The integer 'hashset' is an index into | |
3834 | * that array of random numbers. Now, from all classes that | |
3835 | * are part of the signature of the actual arguments, the | |
3836 | * random numbers at index 'hashset' are taken and summed | |
3837 | * up, giving the hash value. The value of 'hashset' is | |
3838 | * stored at the call to dispatch. This allows to have | |
3839 | * different 'formulas' for calculating the hash value at | |
3840 | * different places where dispatch is called. This allows | |
3841 | * to optimize the hash formula at every individual place | |
3842 | * where dispatch is called, such that hopefully the hash | |
3843 | * value that is computed will directly point to the right | |
3844 | * method in the method cache. */ | |
e11e83f3 | 3845 | unsigned long int hashset = scm_to_ulong (tmp); |
f12745b6 | 3846 | unsigned long int counter = specializers + 1; |
dff98306 | 3847 | SCM tmp_arg = arg1; |
f12745b6 | 3848 | hash_value = 0; |
a61f4e0c | 3849 | while (!scm_is_null (tmp_arg) && counter != 0) |
61364ba6 | 3850 | { |
f12745b6 DH |
3851 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3852 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3853 | tmp_arg = SCM_CDR (tmp_arg); | |
3854 | counter--; | |
61364ba6 | 3855 | } |
f12745b6 DH |
3856 | z = SCM_CDDR (z); |
3857 | method_cache = SCM_CADR (z); | |
e11e83f3 | 3858 | mask = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3859 | hash_value &= mask; |
3860 | cache_end_pos = hash_value; | |
3861 | } | |
f12745b6 | 3862 | } |
61364ba6 | 3863 | |
f12745b6 DH |
3864 | { |
3865 | /* Search the method cache for a method with a matching | |
3866 | * signature. Start the search at position 'hash_value'. The | |
3867 | * hashing implementation uses linear probing for conflict | |
3868 | * resolution, that is, if the signature in question is not | |
3869 | * found at the starting index in the hash table, the next table | |
3870 | * entry is tried, and so on, until in the worst case the whole | |
3871 | * cache has been searched, but still the signature has not been | |
3872 | * found. */ | |
3873 | SCM z; | |
3874 | do | |
3875 | { | |
dff98306 | 3876 | SCM args = arg1; /* list of arguments */ |
4057a3e0 | 3877 | z = SCM_SIMPLE_VECTOR_REF (method_cache, hash_value); |
a61f4e0c | 3878 | while (!scm_is_null (args)) |
61364ba6 MD |
3879 | { |
3880 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 | 3881 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
bc36d050 | 3882 | if (!scm_is_eq (class_of_arg, SCM_CAR (z))) |
61364ba6 | 3883 | goto next_method; |
f12745b6 | 3884 | args = SCM_CDR (args); |
61364ba6 MD |
3885 | z = SCM_CDR (z); |
3886 | } | |
f12745b6 | 3887 | /* Fewer arguments than specifiers => CAR != ENV */ |
a61f4e0c | 3888 | if (scm_is_null (SCM_CAR (z)) || scm_is_pair (SCM_CAR (z))) |
f12745b6 DH |
3889 | goto apply_cmethod; |
3890 | next_method: | |
3891 | hash_value = (hash_value + 1) & mask; | |
3892 | } while (hash_value != cache_end_pos); | |
3893 | ||
3894 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3895 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3896 | |
dff98306 | 3897 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3898 | { |
3899 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3900 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3901 | x = SCM_CMETHOD_BODY (z); |
3902 | goto nontoplevel_begin; | |
3903 | } | |
3904 | } | |
61364ba6 | 3905 | } |
73b64342 | 3906 | |
1d15ecd3 | 3907 | |
7e6e6b37 | 3908 | case (ISYMNUM (SCM_IM_SLOT_REF)): |
ca4be6ea | 3909 | x = SCM_CDR (x); |
1d15ecd3 DH |
3910 | { |
3911 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3912 | unsigned long int slot = SCM_I_INUM (SCM_CDR (x)); |
1d15ecd3 DH |
3913 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); |
3914 | } | |
3915 | ||
3916 | ||
7e6e6b37 | 3917 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): |
ca4be6ea | 3918 | x = SCM_CDR (x); |
1d15ecd3 DH |
3919 | { |
3920 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3921 | unsigned long int slot = SCM_I_INUM (SCM_CADR (x)); |
1d15ecd3 DH |
3922 | SCM value = EVALCAR (SCM_CDDR (x), env); |
3923 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3924 | RETURN (SCM_UNSPECIFIED); | |
3925 | } | |
3926 | ||
c96d76b8 | 3927 | |
22721140 | 3928 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3929 | |
7e6e6b37 | 3930 | case (ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3931 | { |
3932 | SCM test_form = SCM_CDR (x); | |
3933 | x = SCM_CDR (test_form); | |
3934 | while (!SCM_NULL_OR_NIL_P (x)) | |
3935 | { | |
3936 | SCM test_result = EVALCAR (test_form, env); | |
7888309b | 3937 | if (!(scm_is_false (test_result) |
1d15ecd3 DH |
3938 | || SCM_NULL_OR_NIL_P (test_result))) |
3939 | { | |
bc36d050 | 3940 | if (scm_is_eq (SCM_CAR (x), SCM_UNSPECIFIED)) |
1d15ecd3 DH |
3941 | RETURN (test_result); |
3942 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3943 | goto carloop; | |
3944 | } | |
3945 | else | |
3946 | { | |
3947 | test_form = SCM_CDR (x); | |
3948 | x = SCM_CDR (test_form); | |
3949 | } | |
3950 | } | |
3951 | x = test_form; | |
3952 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3953 | goto carloop; | |
3954 | } | |
73b64342 | 3955 | |
c96d76b8 | 3956 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 | 3957 | |
7e6e6b37 | 3958 | case (ISYMNUM (SCM_IM_BIND)): |
2e171178 MV |
3959 | { |
3960 | SCM vars, exps, vals; | |
73b64342 | 3961 | |
2e171178 MV |
3962 | x = SCM_CDR (x); |
3963 | vars = SCM_CAAR (x); | |
3964 | exps = SCM_CDAR (x); | |
2e171178 | 3965 | vals = SCM_EOL; |
a61f4e0c | 3966 | while (!scm_is_null (exps)) |
2e171178 MV |
3967 | { |
3968 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3969 | exps = SCM_CDR (exps); | |
3970 | } | |
3971 | ||
3972 | scm_swap_bindings (vars, vals); | |
9de87eea | 3973 | scm_i_set_dynwinds (scm_acons (vars, vals, scm_i_dynwinds ())); |
1d15ecd3 DH |
3974 | |
3975 | /* Ignore all but the last evaluation result. */ | |
a61f4e0c | 3976 | for (x = SCM_CDR (x); !scm_is_null (SCM_CDR (x)); x = SCM_CDR (x)) |
2e171178 | 3977 | { |
a61f4e0c | 3978 | if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 3979 | CEVAL (SCM_CAR (x), env); |
2e171178 MV |
3980 | } |
3981 | proc = EVALCAR (x, env); | |
73b64342 | 3982 | |
9de87eea | 3983 | scm_i_set_dynwinds (SCM_CDR (scm_i_dynwinds ())); |
2e171178 | 3984 | scm_swap_bindings (vars, vals); |
73b64342 | 3985 | |
ddea3325 | 3986 | RETURN (proc); |
2e171178 | 3987 | } |
c96d76b8 | 3988 | |
1d15ecd3 | 3989 | |
7e6e6b37 | 3990 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 3991 | { |
9a069bdd DH |
3992 | SCM producer; |
3993 | ||
3994 | x = SCM_CDR (x); | |
3995 | producer = EVALCAR (x, env); | |
3996 | x = SCM_CDR (x); | |
3997 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3998 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3999 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
4000 | { |
4001 | /* The list of arguments is not copied. Rather, it is assumed | |
4002 | * that this has been done by the 'values' procedure. */ | |
4003 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
4004 | } | |
a513ead3 | 4005 | else |
82b3e2c6 DH |
4006 | { |
4007 | arg1 = scm_list_1 (arg1); | |
4008 | } | |
9a069bdd DH |
4009 | PREP_APPLY (proc, arg1); |
4010 | goto apply_proc; | |
a513ead3 MV |
4011 | } |
4012 | ||
b7798e10 | 4013 | |
0f2d19dd | 4014 | default: |
dec40cd2 | 4015 | break; |
0f2d19dd | 4016 | } |
dec40cd2 DH |
4017 | } |
4018 | else | |
4019 | { | |
434f2f7a DH |
4020 | if (SCM_VARIABLEP (SCM_CAR (x))) |
4021 | proc = SCM_VARIABLE_REF (SCM_CAR (x)); | |
f9986767 DH |
4022 | else if (SCM_ILOCP (SCM_CAR (x))) |
4023 | proc = *scm_ilookup (SCM_CAR (x), env); | |
a61f4e0c | 4024 | else if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 4025 | proc = CEVAL (SCM_CAR (x), env); |
cc95e00a | 4026 | else if (scm_is_symbol (SCM_CAR (x))) |
0f2d19dd | 4027 | { |
e050d4f8 | 4028 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
4029 | { |
4030 | SCM *location = scm_lookupcar1 (x, env, 1); | |
4031 | if (location == NULL) | |
4032 | { | |
4033 | /* we have lost the race, start again. */ | |
4034 | goto dispatch; | |
4035 | } | |
4036 | proc = *location; | |
4037 | } | |
f8769b1d | 4038 | |
22a52da1 | 4039 | if (SCM_MACROP (proc)) |
0f2d19dd | 4040 | { |
86d31dfe MV |
4041 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
4042 | lookupcar */ | |
e050d4f8 | 4043 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 4044 | #ifdef DEVAL |
7c354052 MD |
4045 | /* Set a flag during macro expansion so that macro |
4046 | application frames can be deleted from the backtrace. */ | |
4047 | SCM_SET_MACROEXP (debug); | |
368bf056 | 4048 | #endif |
dff98306 | 4049 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 4050 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
4051 | #ifdef DEVAL |
4052 | SCM_CLEAR_MACROEXP (debug); | |
4053 | #endif | |
22a52da1 | 4054 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 4055 | { |
3b88ed2a | 4056 | case 3: |
0f2d19dd | 4057 | case 2: |
a61f4e0c | 4058 | if (!scm_is_pair (arg1)) |
dff98306 | 4059 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); |
e7313a9d | 4060 | |
bc36d050 MV |
4061 | assert (!scm_is_eq (x, SCM_CAR (arg1)) |
4062 | && !scm_is_eq (x, SCM_CDR (arg1))); | |
e7313a9d | 4063 | |
6dbd0af5 | 4064 | #ifdef DEVAL |
22a52da1 | 4065 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 4066 | { |
9de87eea | 4067 | SCM_CRITICAL_SECTION_START; |
dff98306 DH |
4068 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4069 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
9de87eea | 4070 | SCM_CRITICAL_SECTION_END; |
6dbd0af5 MD |
4071 | goto dispatch; |
4072 | } | |
4073 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
4074 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
4075 | SCM_CAR (x), | |
4076 | SCM_CDR (x)); | |
6dbd0af5 | 4077 | #endif |
9de87eea | 4078 | SCM_CRITICAL_SECTION_START; |
dff98306 DH |
4079 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4080 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
9de87eea | 4081 | SCM_CRITICAL_SECTION_END; |
680516ba DH |
4082 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
4083 | goto loop; | |
3063e30a | 4084 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 4085 | case 1: |
680516ba DH |
4086 | x = arg1; |
4087 | if (SCM_NIMP (x)) | |
4088 | { | |
4089 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
4090 | goto loop; | |
4091 | } | |
4092 | else | |
4093 | RETURN (arg1); | |
3063e30a | 4094 | #endif |
0f2d19dd | 4095 | case 0: |
dff98306 | 4096 | RETURN (arg1); |
0f2d19dd JB |
4097 | } |
4098 | } | |
4099 | } | |
4100 | else | |
434f2f7a | 4101 | proc = SCM_CAR (x); |
bd987b8e | 4102 | |
ddd8f927 | 4103 | if (SCM_MACROP (proc)) |
0f2d19dd | 4104 | goto handle_a_macro; |
0f2d19dd JB |
4105 | } |
4106 | ||
4107 | ||
dec40cd2 DH |
4108 | /* When reaching this part of the code, the following is granted: Variable x |
4109 | * holds the first pair of an expression of the form (<function> arg ...). | |
4110 | * Variable proc holds the object that resulted from the evaluation of | |
4111 | * <function>. In the following, the arguments (if any) will be evaluated, | |
4112 | * and proc will be applied to them. If proc does not really hold a | |
4113 | * function object, this will be signalled as an error on the scheme | |
4114 | * level. If the number of arguments does not match the number of arguments | |
4115 | * that are allowed to be passed to proc, also an error on the scheme level | |
4116 | * will be signalled. */ | |
6dbd0af5 | 4117 | PREP_APPLY (proc, SCM_EOL); |
a61f4e0c | 4118 | if (scm_is_null (SCM_CDR (x))) { |
6dbd0af5 | 4119 | ENTER_APPLY; |
89efbff4 | 4120 | evap0: |
ddd8f927 | 4121 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
4122 | switch (SCM_TYP7 (proc)) |
4123 | { /* no arguments given */ | |
4124 | case scm_tc7_subr_0: | |
4125 | RETURN (SCM_SUBRF (proc) ()); | |
4126 | case scm_tc7_subr_1o: | |
4127 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
4128 | case scm_tc7_lsubr: | |
4129 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
4130 | case scm_tc7_rpsubr: | |
4131 | RETURN (SCM_BOOL_T); | |
4132 | case scm_tc7_asubr: | |
4133 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 4134 | case scm_tc7_smob: |
68b06924 | 4135 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4136 | goto badfun; |
68b06924 | 4137 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 4138 | case scm_tc7_cclo: |
dff98306 | 4139 | arg1 = proc; |
0f2d19dd | 4140 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
4141 | #ifdef DEVAL |
4142 | debug.info->a.proc = proc; | |
dff98306 | 4143 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4144 | #endif |
0f2d19dd | 4145 | goto evap1; |
89efbff4 MD |
4146 | case scm_tc7_pws: |
4147 | proc = SCM_PROCEDURE (proc); | |
4148 | #ifdef DEVAL | |
4149 | debug.info->a.proc = proc; | |
4150 | #endif | |
002f1a5d MD |
4151 | if (!SCM_CLOSUREP (proc)) |
4152 | goto evap0; | |
ddd8f927 | 4153 | /* fallthrough */ |
0f2d19dd | 4154 | case scm_tcs_closures: |
ddd8f927 DH |
4155 | { |
4156 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 4157 | if (scm_is_pair (formals)) |
212e58ed | 4158 | goto wrongnumargs; |
ddd8f927 DH |
4159 | x = SCM_CLOSURE_BODY (proc); |
4160 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
4161 | goto nontoplevel_begin; | |
4162 | } | |
904a077d | 4163 | case scm_tcs_struct: |
195847fa MD |
4164 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4165 | { | |
4166 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 4167 | arg1 = SCM_EOL; |
195847fa MD |
4168 | goto type_dispatch; |
4169 | } | |
2ca0d207 | 4170 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4171 | { |
dff98306 | 4172 | arg1 = proc; |
195847fa MD |
4173 | proc = (SCM_I_ENTITYP (proc) |
4174 | ? SCM_ENTITY_PROCEDURE (proc) | |
4175 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 4176 | #ifdef DEVAL |
195847fa | 4177 | debug.info->a.proc = proc; |
dff98306 | 4178 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 4179 | #endif |
ddd8f927 | 4180 | goto evap1; |
da7f71d7 | 4181 | } |
2ca0d207 DH |
4182 | else |
4183 | goto badfun; | |
0f2d19dd JB |
4184 | case scm_tc7_subr_1: |
4185 | case scm_tc7_subr_2: | |
4186 | case scm_tc7_subr_2o: | |
14b18ed6 | 4187 | case scm_tc7_dsubr: |
0f2d19dd JB |
4188 | case scm_tc7_cxr: |
4189 | case scm_tc7_subr_3: | |
4190 | case scm_tc7_lsubr_2: | |
212e58ed | 4191 | wrongnumargs: |
f5bf2977 | 4192 | scm_wrong_num_args (proc); |
0f2d19dd | 4193 | default: |
ddd8f927 DH |
4194 | badfun: |
4195 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 4196 | } |
6dbd0af5 | 4197 | } |
0f2d19dd JB |
4198 | |
4199 | /* must handle macros by here */ | |
4200 | x = SCM_CDR (x); | |
a61f4e0c | 4201 | if (scm_is_pair (x)) |
dff98306 | 4202 | arg1 = EVALCAR (x, env); |
680ed4a8 | 4203 | else |
ab1f1094 | 4204 | scm_wrong_num_args (proc); |
6dbd0af5 | 4205 | #ifdef DEVAL |
dff98306 | 4206 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4207 | #endif |
0f2d19dd | 4208 | x = SCM_CDR (x); |
42030fb2 DH |
4209 | { |
4210 | SCM arg2; | |
a61f4e0c | 4211 | if (scm_is_null (x)) |
42030fb2 DH |
4212 | { |
4213 | ENTER_APPLY; | |
4214 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 4215 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4216 | switch (SCM_TYP7 (proc)) |
4217 | { /* have one argument in arg1 */ | |
4218 | case scm_tc7_subr_2o: | |
4219 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4220 | case scm_tc7_subr_1: | |
4221 | case scm_tc7_subr_1o: | |
4222 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4223 | case scm_tc7_dsubr: |
e11e83f3 | 4224 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4225 | { |
d9a67fc4 | 4226 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4227 | } |
4228 | else if (SCM_REALP (arg1)) | |
4229 | { | |
d9a67fc4 | 4230 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4231 | } |
4232 | else if (SCM_BIGP (arg1)) | |
4233 | { | |
d9a67fc4 | 4234 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
14b18ed6 | 4235 | } |
f92e85f7 MV |
4236 | else if (SCM_FRACTIONP (arg1)) |
4237 | { | |
d9a67fc4 | 4238 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 MV |
4239 | } |
4240 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
cc95e00a MV |
4241 | SCM_ARG1, |
4242 | scm_i_symbol_chars (SCM_SNAME (proc))); | |
42030fb2 | 4243 | case scm_tc7_cxr: |
a61f4e0c | 4244 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
42030fb2 DH |
4245 | case scm_tc7_rpsubr: |
4246 | RETURN (SCM_BOOL_T); | |
4247 | case scm_tc7_asubr: | |
4248 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4249 | case scm_tc7_lsubr: | |
0f2d19dd | 4250 | #ifdef DEVAL |
42030fb2 | 4251 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 4252 | #else |
42030fb2 | 4253 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 4254 | #endif |
42030fb2 DH |
4255 | case scm_tc7_smob: |
4256 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4257 | goto badfun; | |
4258 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
4259 | case scm_tc7_cclo: | |
4260 | arg2 = arg1; | |
4261 | arg1 = proc; | |
4262 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4263 | #ifdef DEVAL |
42030fb2 DH |
4264 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4265 | debug.info->a.proc = proc; | |
6dbd0af5 | 4266 | #endif |
42030fb2 DH |
4267 | goto evap2; |
4268 | case scm_tc7_pws: | |
4269 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 4270 | #ifdef DEVAL |
42030fb2 | 4271 | debug.info->a.proc = proc; |
89efbff4 | 4272 | #endif |
42030fb2 DH |
4273 | if (!SCM_CLOSUREP (proc)) |
4274 | goto evap1; | |
ddd8f927 | 4275 | /* fallthrough */ |
42030fb2 | 4276 | case scm_tcs_closures: |
ddd8f927 DH |
4277 | { |
4278 | /* clos1: */ | |
4279 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4280 | if (scm_is_null (formals) |
4281 | || (scm_is_pair (formals) && scm_is_pair (SCM_CDR (formals)))) | |
212e58ed | 4282 | goto wrongnumargs; |
ddd8f927 | 4283 | x = SCM_CLOSURE_BODY (proc); |
0f2d19dd | 4284 | #ifdef DEVAL |
ddd8f927 DH |
4285 | env = SCM_EXTEND_ENV (formals, |
4286 | debug.info->a.args, | |
4287 | SCM_ENV (proc)); | |
0f2d19dd | 4288 | #else |
ddd8f927 DH |
4289 | env = SCM_EXTEND_ENV (formals, |
4290 | scm_list_1 (arg1), | |
4291 | SCM_ENV (proc)); | |
0f2d19dd | 4292 | #endif |
ddd8f927 DH |
4293 | goto nontoplevel_begin; |
4294 | } | |
42030fb2 DH |
4295 | case scm_tcs_struct: |
4296 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4297 | { | |
4298 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 4299 | #ifdef DEVAL |
42030fb2 | 4300 | arg1 = debug.info->a.args; |
f3d2630a | 4301 | #else |
42030fb2 | 4302 | arg1 = scm_list_1 (arg1); |
f3d2630a | 4303 | #endif |
42030fb2 DH |
4304 | goto type_dispatch; |
4305 | } | |
2ca0d207 | 4306 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4307 | { |
4308 | arg2 = arg1; | |
4309 | arg1 = proc; | |
4310 | proc = (SCM_I_ENTITYP (proc) | |
4311 | ? SCM_ENTITY_PROCEDURE (proc) | |
4312 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 4313 | #ifdef DEVAL |
42030fb2 DH |
4314 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4315 | debug.info->a.proc = proc; | |
0c32d76c | 4316 | #endif |
ddd8f927 | 4317 | goto evap2; |
42030fb2 | 4318 | } |
2ca0d207 DH |
4319 | else |
4320 | goto badfun; | |
42030fb2 DH |
4321 | case scm_tc7_subr_2: |
4322 | case scm_tc7_subr_0: | |
4323 | case scm_tc7_subr_3: | |
4324 | case scm_tc7_lsubr_2: | |
ab1f1094 | 4325 | scm_wrong_num_args (proc); |
42030fb2 DH |
4326 | default: |
4327 | goto badfun; | |
4328 | } | |
4329 | } | |
a61f4e0c | 4330 | if (scm_is_pair (x)) |
42030fb2 DH |
4331 | arg2 = EVALCAR (x, env); |
4332 | else | |
ab1f1094 | 4333 | scm_wrong_num_args (proc); |
bd987b8e | 4334 | |
42030fb2 | 4335 | { /* have two or more arguments */ |
6dbd0af5 | 4336 | #ifdef DEVAL |
42030fb2 | 4337 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 4338 | #endif |
42030fb2 | 4339 | x = SCM_CDR (x); |
a61f4e0c | 4340 | if (scm_is_null (x)) { |
42030fb2 DH |
4341 | ENTER_APPLY; |
4342 | evap2: | |
ddd8f927 | 4343 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4344 | switch (SCM_TYP7 (proc)) |
4345 | { /* have two arguments */ | |
4346 | case scm_tc7_subr_2: | |
4347 | case scm_tc7_subr_2o: | |
4348 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4349 | case scm_tc7_lsubr: | |
0f2d19dd | 4350 | #ifdef DEVAL |
42030fb2 | 4351 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 4352 | #else |
42030fb2 DH |
4353 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
4354 | #endif | |
4355 | case scm_tc7_lsubr_2: | |
4356 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
4357 | case scm_tc7_rpsubr: | |
4358 | case scm_tc7_asubr: | |
4359 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4360 | case scm_tc7_smob: | |
4361 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4362 | goto badfun; | |
4363 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
4364 | cclon: | |
4365 | case scm_tc7_cclo: | |
0f2d19dd | 4366 | #ifdef DEVAL |
42030fb2 DH |
4367 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4368 | scm_cons (proc, debug.info->a.args), | |
4369 | SCM_EOL)); | |
0f2d19dd | 4370 | #else |
42030fb2 DH |
4371 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4372 | scm_cons2 (proc, arg1, | |
4373 | scm_cons (arg2, | |
4374 | scm_eval_args (x, | |
4375 | env, | |
4376 | proc))), | |
4377 | SCM_EOL)); | |
4378 | #endif | |
4379 | case scm_tcs_struct: | |
4380 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4381 | { | |
4382 | x = SCM_ENTITY_PROCEDURE (proc); | |
4383 | #ifdef DEVAL | |
4384 | arg1 = debug.info->a.args; | |
4385 | #else | |
4386 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 4387 | #endif |
42030fb2 DH |
4388 | goto type_dispatch; |
4389 | } | |
2ca0d207 | 4390 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4391 | { |
4392 | operatorn: | |
f3d2630a | 4393 | #ifdef DEVAL |
42030fb2 DH |
4394 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4395 | ? SCM_ENTITY_PROCEDURE (proc) | |
4396 | : SCM_OPERATOR_PROCEDURE (proc), | |
4397 | scm_cons (proc, debug.info->a.args), | |
4398 | SCM_EOL)); | |
f3d2630a | 4399 | #else |
42030fb2 DH |
4400 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4401 | ? SCM_ENTITY_PROCEDURE (proc) | |
4402 | : SCM_OPERATOR_PROCEDURE (proc), | |
4403 | scm_cons2 (proc, arg1, | |
4404 | scm_cons (arg2, | |
4405 | scm_eval_args (x, | |
4406 | env, | |
4407 | proc))), | |
4408 | SCM_EOL)); | |
f3d2630a | 4409 | #endif |
42030fb2 | 4410 | } |
2ca0d207 DH |
4411 | else |
4412 | goto badfun; | |
42030fb2 | 4413 | case scm_tc7_subr_0: |
14b18ed6 | 4414 | case scm_tc7_dsubr: |
42030fb2 DH |
4415 | case scm_tc7_cxr: |
4416 | case scm_tc7_subr_1o: | |
4417 | case scm_tc7_subr_1: | |
4418 | case scm_tc7_subr_3: | |
ab1f1094 | 4419 | scm_wrong_num_args (proc); |
42030fb2 | 4420 | default: |
9b07e212 | 4421 | goto badfun; |
42030fb2 DH |
4422 | case scm_tc7_pws: |
4423 | proc = SCM_PROCEDURE (proc); | |
4424 | #ifdef DEVAL | |
4425 | debug.info->a.proc = proc; | |
4426 | #endif | |
4427 | if (!SCM_CLOSUREP (proc)) | |
4428 | goto evap2; | |
ddd8f927 | 4429 | /* fallthrough */ |
42030fb2 | 4430 | case scm_tcs_closures: |
ddd8f927 DH |
4431 | { |
4432 | /* clos2: */ | |
4433 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4434 | if (scm_is_null (formals) |
4435 | || (scm_is_pair (formals) | |
4436 | && (scm_is_null (SCM_CDR (formals)) | |
4437 | || (scm_is_pair (SCM_CDR (formals)) | |
4438 | && scm_is_pair (SCM_CDDR (formals)))))) | |
212e58ed | 4439 | goto wrongnumargs; |
0c32d76c | 4440 | #ifdef DEVAL |
ddd8f927 DH |
4441 | env = SCM_EXTEND_ENV (formals, |
4442 | debug.info->a.args, | |
4443 | SCM_ENV (proc)); | |
195847fa | 4444 | #else |
ddd8f927 DH |
4445 | env = SCM_EXTEND_ENV (formals, |
4446 | scm_list_2 (arg1, arg2), | |
4447 | SCM_ENV (proc)); | |
195847fa | 4448 | #endif |
ddd8f927 DH |
4449 | x = SCM_CLOSURE_BODY (proc); |
4450 | goto nontoplevel_begin; | |
4451 | } | |
42030fb2 DH |
4452 | } |
4453 | } | |
a61f4e0c | 4454 | if (!scm_is_pair (x)) |
ab1f1094 | 4455 | scm_wrong_num_args (proc); |
42030fb2 DH |
4456 | #ifdef DEVAL |
4457 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4458 | deval_args (x, env, proc, | |
4459 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4460 | #endif | |
4461 | ENTER_APPLY; | |
4462 | evap3: | |
ddd8f927 | 4463 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4464 | switch (SCM_TYP7 (proc)) |
4465 | { /* have 3 or more arguments */ | |
4466 | #ifdef DEVAL | |
6dbd0af5 | 4467 | case scm_tc7_subr_3: |
a61f4e0c | 4468 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4469 | scm_wrong_num_args (proc); |
4470 | else | |
4471 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4472 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4473 | case scm_tc7_asubr: |
4474 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4475 | arg2 = SCM_CDDR (debug.info->a.args); | |
4476 | do | |
4477 | { | |
4478 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4479 | arg2 = SCM_CDR (arg2); | |
4480 | } | |
4481 | while (SCM_NIMP (arg2)); | |
4482 | RETURN (arg1); | |
4483 | case scm_tc7_rpsubr: | |
7888309b | 4484 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4485 | RETURN (SCM_BOOL_F); |
4486 | arg1 = SCM_CDDR (debug.info->a.args); | |
4487 | do | |
4488 | { | |
7888309b | 4489 | if (scm_is_false (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) |
42030fb2 DH |
4490 | RETURN (SCM_BOOL_F); |
4491 | arg2 = SCM_CAR (arg1); | |
4492 | arg1 = SCM_CDR (arg1); | |
4493 | } | |
4494 | while (SCM_NIMP (arg1)); | |
4495 | RETURN (SCM_BOOL_T); | |
4496 | case scm_tc7_lsubr_2: | |
4497 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4498 | SCM_CDDR (debug.info->a.args))); | |
4499 | case scm_tc7_lsubr: | |
4500 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4501 | case scm_tc7_smob: | |
4502 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4503 | goto badfun; | |
4504 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4505 | SCM_CDDR (debug.info->a.args))); | |
4506 | case scm_tc7_cclo: | |
4507 | goto cclon; | |
002f1a5d MD |
4508 | case scm_tc7_pws: |
4509 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4510 | debug.info->a.proc = proc; |
002f1a5d | 4511 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4512 | goto evap3; |
ddd8f927 | 4513 | /* fallthrough */ |
6dbd0af5 | 4514 | case scm_tcs_closures: |
ddd8f927 DH |
4515 | { |
4516 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4517 | if (scm_is_null (formals) |
4518 | || (scm_is_pair (formals) | |
4519 | && (scm_is_null (SCM_CDR (formals)) | |
4520 | || (scm_is_pair (SCM_CDR (formals)) | |
ddd8f927 | 4521 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4522 | goto wrongnumargs; |
ddd8f927 DH |
4523 | SCM_SET_ARGSREADY (debug); |
4524 | env = SCM_EXTEND_ENV (formals, | |
4525 | debug.info->a.args, | |
4526 | SCM_ENV (proc)); | |
4527 | x = SCM_CLOSURE_BODY (proc); | |
4528 | goto nontoplevel_begin; | |
4529 | } | |
6dbd0af5 | 4530 | #else /* DEVAL */ |
42030fb2 | 4531 | case scm_tc7_subr_3: |
a61f4e0c | 4532 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4533 | scm_wrong_num_args (proc); |
4534 | else | |
4535 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4536 | case scm_tc7_asubr: |
4537 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4538 | do | |
4539 | { | |
4540 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4541 | x = SCM_CDR(x); | |
4542 | } | |
a61f4e0c | 4543 | while (!scm_is_null (x)); |
42030fb2 DH |
4544 | RETURN (arg1); |
4545 | case scm_tc7_rpsubr: | |
7888309b | 4546 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4547 | RETURN (SCM_BOOL_F); |
4548 | do | |
4549 | { | |
4550 | arg1 = EVALCAR (x, env); | |
7888309b | 4551 | if (scm_is_false (SCM_SUBRF (proc) (arg2, arg1))) |
42030fb2 DH |
4552 | RETURN (SCM_BOOL_F); |
4553 | arg2 = arg1; | |
4554 | x = SCM_CDR (x); | |
4555 | } | |
a61f4e0c | 4556 | while (!scm_is_null (x)); |
42030fb2 DH |
4557 | RETURN (SCM_BOOL_T); |
4558 | case scm_tc7_lsubr_2: | |
4559 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4560 | case scm_tc7_lsubr: | |
4561 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4562 | arg2, | |
4563 | scm_eval_args (x, env, proc)))); | |
4564 | case scm_tc7_smob: | |
4565 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4566 | goto badfun; | |
4567 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4568 | scm_eval_args (x, env, proc))); | |
4569 | case scm_tc7_cclo: | |
4570 | goto cclon; | |
4571 | case scm_tc7_pws: | |
4572 | proc = SCM_PROCEDURE (proc); | |
4573 | if (!SCM_CLOSUREP (proc)) | |
4574 | goto evap3; | |
ddd8f927 DH |
4575 | /* fallthrough */ |
4576 | case scm_tcs_closures: | |
da7f71d7 | 4577 | { |
ddd8f927 | 4578 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
a61f4e0c MV |
4579 | if (scm_is_null (formals) |
4580 | || (scm_is_pair (formals) | |
4581 | && (scm_is_null (SCM_CDR (formals)) | |
4582 | || (scm_is_pair (SCM_CDR (formals)) | |
42030fb2 | 4583 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4584 | goto wrongnumargs; |
ddd8f927 DH |
4585 | env = SCM_EXTEND_ENV (formals, |
4586 | scm_cons2 (arg1, | |
4587 | arg2, | |
4588 | scm_eval_args (x, env, proc)), | |
4589 | SCM_ENV (proc)); | |
4590 | x = SCM_CLOSURE_BODY (proc); | |
4591 | goto nontoplevel_begin; | |
da7f71d7 | 4592 | } |
0f2d19dd | 4593 | #endif /* DEVAL */ |
42030fb2 DH |
4594 | case scm_tcs_struct: |
4595 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4596 | { | |
f3d2630a | 4597 | #ifdef DEVAL |
42030fb2 | 4598 | arg1 = debug.info->a.args; |
f3d2630a | 4599 | #else |
42030fb2 | 4600 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4601 | #endif |
42030fb2 DH |
4602 | x = SCM_ENTITY_PROCEDURE (proc); |
4603 | goto type_dispatch; | |
4604 | } | |
2ca0d207 | 4605 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4606 | goto operatorn; |
2ca0d207 DH |
4607 | else |
4608 | goto badfun; | |
42030fb2 DH |
4609 | case scm_tc7_subr_2: |
4610 | case scm_tc7_subr_1o: | |
4611 | case scm_tc7_subr_2o: | |
4612 | case scm_tc7_subr_0: | |
14b18ed6 | 4613 | case scm_tc7_dsubr: |
42030fb2 DH |
4614 | case scm_tc7_cxr: |
4615 | case scm_tc7_subr_1: | |
ab1f1094 | 4616 | scm_wrong_num_args (proc); |
42030fb2 | 4617 | default: |
9b07e212 | 4618 | goto badfun; |
42030fb2 DH |
4619 | } |
4620 | } | |
0f2d19dd JB |
4621 | } |
4622 | #ifdef DEVAL | |
6dbd0af5 | 4623 | exit: |
5132eef0 | 4624 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4625 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4626 | { |
b7ff98dd | 4627 | SCM_CLEAR_TRACED_FRAME (debug); |
7c9c0169 | 4628 | arg1 = scm_make_debugobj (&debug); |
d95c0b76 | 4629 | SCM_TRAPS_P = 0; |
7c9c0169 | 4630 | arg1 = scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4631 | SCM_TRAPS_P = 1; |
7c9c0169 NJ |
4632 | if (scm_is_pair (arg1) && scm_is_eq (SCM_CAR (arg1), sym_instead)) |
4633 | proc = SCM_CDR (arg1); | |
6dbd0af5 | 4634 | } |
9de87eea | 4635 | scm_i_set_last_debug_frame (debug.prev); |
0f2d19dd JB |
4636 | return proc; |
4637 | #endif | |
4638 | } | |
4639 | ||
6dbd0af5 MD |
4640 | |
4641 | /* SECTION: This code is compiled once. | |
4642 | */ | |
4643 | ||
0f2d19dd JB |
4644 | #ifndef DEVAL |
4645 | ||
fdc28395 | 4646 | \f |
d0b07b5d | 4647 | |
fdc28395 KN |
4648 | /* Simple procedure calls |
4649 | */ | |
4650 | ||
4651 | SCM | |
4652 | scm_call_0 (SCM proc) | |
4653 | { | |
4654 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4655 | } | |
4656 | ||
4657 | SCM | |
4658 | scm_call_1 (SCM proc, SCM arg1) | |
4659 | { | |
4660 | return scm_apply (proc, arg1, scm_listofnull); | |
4661 | } | |
4662 | ||
4663 | SCM | |
4664 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4665 | { | |
4666 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4667 | } | |
4668 | ||
4669 | SCM | |
4670 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4671 | { | |
4672 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4673 | } | |
4674 | ||
d95c0b76 NJ |
4675 | SCM |
4676 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4677 | { | |
4678 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4679 | scm_cons (arg4, scm_listofnull))); | |
4680 | } | |
4681 | ||
fdc28395 KN |
4682 | /* Simple procedure applies |
4683 | */ | |
4684 | ||
4685 | SCM | |
4686 | scm_apply_0 (SCM proc, SCM args) | |
4687 | { | |
4688 | return scm_apply (proc, args, SCM_EOL); | |
4689 | } | |
4690 | ||
4691 | SCM | |
4692 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4693 | { | |
4694 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4695 | } | |
4696 | ||
4697 | SCM | |
4698 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4699 | { | |
4700 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4701 | } | |
4702 | ||
4703 | SCM | |
4704 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4705 | { | |
4706 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4707 | SCM_EOL); | |
4708 | } | |
4709 | ||
82a2622a | 4710 | /* This code processes the arguments to apply: |
b145c172 JB |
4711 | |
4712 | (apply PROC ARG1 ... ARGS) | |
4713 | ||
82a2622a JB |
4714 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4715 | ... arguments onto the front of ARGS, and returns the resulting | |
4716 | list. Note that ARGS is a list; thus, the argument to this | |
4717 | function is a list whose last element is a list. | |
4718 | ||
4719 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4720 | result. apply:nconc2last takes care of building the list of |
4721 | arguments, given (ARG1 ... ARGS). | |
4722 | ||
82a2622a JB |
4723 | Rather than do new consing, apply:nconc2last destroys its argument. |
4724 | On that topic, this code came into my care with the following | |
4725 | beautifully cryptic comment on that topic: "This will only screw | |
4726 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4727 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4728 | |
3b3b36dd | 4729 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4730 | (SCM lst), |
4731 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4732 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4733 | "@var{args}, and returns the resulting list. Note that\n" | |
4734 | "@var{args} is a list; thus, the argument to this function is\n" | |
4735 | "a list whose last element is a list.\n" | |
4736 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4737 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4738 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4739 | { |
4740 | SCM *lloc; | |
34d19ef6 | 4741 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4742 | lloc = &lst; |
a61f4e0c | 4743 | while (!scm_is_null (SCM_CDR (*lloc))) /* Perhaps should be |
c96d76b8 NJ |
4744 | SCM_NULL_OR_NIL_P, but not |
4745 | needed in 99.99% of cases, | |
4746 | and it could seriously hurt | |
4747 | performance. - Neil */ | |
a23afe53 | 4748 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4749 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4750 | *lloc = SCM_CAR (*lloc); |
4751 | return lst; | |
4752 | } | |
1bbd0b84 | 4753 | #undef FUNC_NAME |
0f2d19dd JB |
4754 | |
4755 | #endif /* !DEVAL */ | |
4756 | ||
6dbd0af5 MD |
4757 | |
4758 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4759 | * It is compiled twice. | |
4760 | */ | |
4761 | ||
0f2d19dd | 4762 | #if 0 |
0f2d19dd | 4763 | SCM |
6e8d25a6 | 4764 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4765 | {} |
4766 | #endif | |
4767 | ||
4768 | #if 0 | |
0f2d19dd | 4769 | SCM |
6e8d25a6 | 4770 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4771 | {} |
0f2d19dd JB |
4772 | #endif |
4773 | ||
1cc91f1b | 4774 | |
82a2622a JB |
4775 | /* Apply a function to a list of arguments. |
4776 | ||
4777 | This function is exported to the Scheme level as taking two | |
4778 | required arguments and a tail argument, as if it were: | |
4779 | (lambda (proc arg1 . args) ...) | |
4780 | Thus, if you just have a list of arguments to pass to a procedure, | |
4781 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4782 | args, pass the first as ARG1, then cons any remaining fixed args | |
4783 | onto the front of your argument list, and pass that as ARGS. */ | |
4784 | ||
0f2d19dd | 4785 | SCM |
1bbd0b84 | 4786 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4787 | { |
0f2d19dd | 4788 | #ifdef DEVAL |
92c2555f MV |
4789 | scm_t_debug_frame debug; |
4790 | scm_t_debug_info debug_vect_body; | |
9de87eea | 4791 | debug.prev = scm_i_last_debug_frame (); |
b7ff98dd | 4792 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4793 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4794 | debug.vect[0].a.proc = proc; |
4795 | debug.vect[0].a.args = SCM_EOL; | |
9de87eea | 4796 | scm_i_set_last_debug_frame (&debug); |
0f2d19dd | 4797 | #else |
434f2f7a | 4798 | if (scm_debug_mode_p) |
0f2d19dd | 4799 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4800 | #endif |
4801 | ||
4802 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4803 | |
4804 | /* If ARGS is the empty list, then we're calling apply with only two | |
4805 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4806 | the case, futz with things so that ARG1 is the first argument to | |
4807 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4808 | rest. |
4809 | ||
4810 | Setting the debug apply frame args this way is pretty messy. | |
4811 | Perhaps we should store arg1 and args directly in the frame as | |
4812 | received, and let scm_frame_arguments unpack them, because that's | |
4813 | a relatively rare operation. This works for now; if the Guile | |
4814 | developer archives are still around, see Mikael's post of | |
4815 | 11-Apr-97. */ | |
a61f4e0c | 4816 | if (scm_is_null (args)) |
0f2d19dd | 4817 | { |
a61f4e0c | 4818 | if (scm_is_null (arg1)) |
30000774 JB |
4819 | { |
4820 | arg1 = SCM_UNDEFINED; | |
4821 | #ifdef DEVAL | |
4822 | debug.vect[0].a.args = SCM_EOL; | |
4823 | #endif | |
4824 | } | |
0f2d19dd JB |
4825 | else |
4826 | { | |
30000774 JB |
4827 | #ifdef DEVAL |
4828 | debug.vect[0].a.args = arg1; | |
4829 | #endif | |
0f2d19dd JB |
4830 | args = SCM_CDR (arg1); |
4831 | arg1 = SCM_CAR (arg1); | |
4832 | } | |
4833 | } | |
4834 | else | |
4835 | { | |
0f2d19dd | 4836 | args = scm_nconc2last (args); |
30000774 JB |
4837 | #ifdef DEVAL |
4838 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4839 | #endif | |
0f2d19dd | 4840 | } |
0f2d19dd | 4841 | #ifdef DEVAL |
b6d75948 | 4842 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 | 4843 | { |
7c9c0169 | 4844 | SCM tmp = scm_make_debugobj (&debug); |
d95c0b76 NJ |
4845 | SCM_TRAPS_P = 0; |
4846 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4847 | SCM_TRAPS_P = 1; | |
6dbd0af5 | 4848 | } |
6dbd0af5 MD |
4849 | ENTER_APPLY; |
4850 | #endif | |
6dbd0af5 | 4851 | tail: |
0f2d19dd JB |
4852 | switch (SCM_TYP7 (proc)) |
4853 | { | |
4854 | case scm_tc7_subr_2o: | |
8ab3d8a0 KR |
4855 | if (SCM_UNBNDP (arg1)) |
4856 | scm_wrong_num_args (proc); | |
4857 | if (scm_is_null (args)) | |
4858 | args = SCM_UNDEFINED; | |
4859 | else | |
4860 | { | |
4861 | if (! scm_is_null (SCM_CDR (args))) | |
4862 | scm_wrong_num_args (proc); | |
4863 | args = SCM_CAR (args); | |
4864 | } | |
ddea3325 | 4865 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4866 | case scm_tc7_subr_2: |
a61f4e0c | 4867 | if (scm_is_null (args) || !scm_is_null (SCM_CDR (args))) |
ab1f1094 | 4868 | scm_wrong_num_args (proc); |
0f2d19dd | 4869 | args = SCM_CAR (args); |
ddea3325 | 4870 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4871 | case scm_tc7_subr_0: |
ab1f1094 DH |
4872 | if (!SCM_UNBNDP (arg1)) |
4873 | scm_wrong_num_args (proc); | |
4874 | else | |
4875 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4876 | case scm_tc7_subr_1: |
ab1f1094 DH |
4877 | if (SCM_UNBNDP (arg1)) |
4878 | scm_wrong_num_args (proc); | |
0f2d19dd | 4879 | case scm_tc7_subr_1o: |
a61f4e0c | 4880 | if (!scm_is_null (args)) |
ab1f1094 DH |
4881 | scm_wrong_num_args (proc); |
4882 | else | |
4883 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4884 | case scm_tc7_dsubr: |
a61f4e0c | 4885 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
14b18ed6 | 4886 | scm_wrong_num_args (proc); |
e11e83f3 | 4887 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4888 | { |
d9a67fc4 | 4889 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4890 | } |
4891 | else if (SCM_REALP (arg1)) | |
4892 | { | |
d9a67fc4 | 4893 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4894 | } |
4895 | else if (SCM_BIGP (arg1)) | |
f92e85f7 | 4896 | { |
d9a67fc4 | 4897 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
4898 | } |
4899 | else if (SCM_FRACTIONP (arg1)) | |
4900 | { | |
d9a67fc4 | 4901 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 4902 | } |
14b18ed6 | 4903 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 4904 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
0f2d19dd | 4905 | case scm_tc7_cxr: |
a61f4e0c | 4906 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
ab1f1094 | 4907 | scm_wrong_num_args (proc); |
a61f4e0c | 4908 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
0f2d19dd | 4909 | case scm_tc7_subr_3: |
a61f4e0c MV |
4910 | if (scm_is_null (args) |
4911 | || scm_is_null (SCM_CDR (args)) | |
4912 | || !scm_is_null (SCM_CDDR (args))) | |
ab1f1094 DH |
4913 | scm_wrong_num_args (proc); |
4914 | else | |
4915 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4916 | case scm_tc7_lsubr: |
4917 | #ifdef DEVAL | |
ddea3325 | 4918 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4919 | #else |
ddea3325 | 4920 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4921 | #endif |
4922 | case scm_tc7_lsubr_2: | |
a61f4e0c | 4923 | if (!scm_is_pair (args)) |
ab1f1094 DH |
4924 | scm_wrong_num_args (proc); |
4925 | else | |
4926 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd | 4927 | case scm_tc7_asubr: |
a61f4e0c | 4928 | if (scm_is_null (args)) |
ddea3325 | 4929 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4930 | while (SCM_NIMP (args)) |
4931 | { | |
a61f4e0c | 4932 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
0f2d19dd JB |
4933 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); |
4934 | args = SCM_CDR (args); | |
4935 | } | |
4936 | RETURN (arg1); | |
4937 | case scm_tc7_rpsubr: | |
a61f4e0c | 4938 | if (scm_is_null (args)) |
0f2d19dd JB |
4939 | RETURN (SCM_BOOL_T); |
4940 | while (SCM_NIMP (args)) | |
4941 | { | |
a61f4e0c | 4942 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
7888309b | 4943 | if (scm_is_false (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) |
0f2d19dd JB |
4944 | RETURN (SCM_BOOL_F); |
4945 | arg1 = SCM_CAR (args); | |
4946 | args = SCM_CDR (args); | |
4947 | } | |
4948 | RETURN (SCM_BOOL_T); | |
4949 | case scm_tcs_closures: | |
4950 | #ifdef DEVAL | |
6dbd0af5 | 4951 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4952 | #else |
4953 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4954 | #endif | |
726d810a | 4955 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4956 | scm_wrong_num_args (proc); |
1609038c MD |
4957 | |
4958 | /* Copy argument list */ | |
4959 | if (SCM_IMP (arg1)) | |
4960 | args = arg1; | |
4961 | else | |
4962 | { | |
4963 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
a61f4e0c | 4964 | for (arg1 = SCM_CDR (arg1); scm_is_pair (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4965 | { |
05b15362 | 4966 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4967 | tl = SCM_CDR (tl); |
4968 | } | |
4969 | SCM_SETCDR (tl, arg1); | |
4970 | } | |
4971 | ||
821f18a4 DH |
4972 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4973 | args, | |
4974 | SCM_ENV (proc)); | |
f9450cdb | 4975 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4976 | again: |
05b15362 | 4977 | arg1 = SCM_CDR (proc); |
a61f4e0c | 4978 | while (!scm_is_null (arg1)) |
2ddb0920 MD |
4979 | { |
4980 | if (SCM_IMP (SCM_CAR (proc))) | |
4981 | { | |
4982 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4983 | { | |
cce0e9c8 | 4984 | scm_dynwind_begin (0); |
2b829bbb | 4985 | scm_i_dynwind_pthread_mutex_lock (&source_mutex); |
9bc4701c MD |
4986 | /* check for race condition */ |
4987 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4988 | m_expand_body (proc, args); |
cce0e9c8 | 4989 | scm_dynwind_end (); |
e791c18f | 4990 | goto again; |
2ddb0920 | 4991 | } |
5280aaca | 4992 | else |
17fa3fcf | 4993 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4994 | } |
4995 | else | |
b1cb24ff | 4996 | (void) EVAL (SCM_CAR (proc), args); |
e791c18f | 4997 | proc = arg1; |
05b15362 | 4998 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4999 | } |
e791c18f | 5000 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 5001 | case scm_tc7_smob: |
68b06924 | 5002 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 5003 | goto badproc; |
afa38f6e | 5004 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 5005 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
a61f4e0c | 5006 | else if (scm_is_null (args)) |
ddea3325 | 5007 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
a61f4e0c | 5008 | else if (scm_is_null (SCM_CDR (args))) |
ddea3325 | 5009 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 5010 | else |
68b06924 | 5011 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
5012 | case scm_tc7_cclo: |
5013 | #ifdef DEVAL | |
6dbd0af5 MD |
5014 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
5015 | arg1 = proc; | |
5016 | proc = SCM_CCLO_SUBR (proc); | |
5017 | debug.vect[0].a.proc = proc; | |
5018 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
5019 | #else |
5020 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
5021 | arg1 = proc; |
5022 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 5023 | #endif |
0f2d19dd | 5024 | goto tail; |
89efbff4 MD |
5025 | case scm_tc7_pws: |
5026 | proc = SCM_PROCEDURE (proc); | |
5027 | #ifdef DEVAL | |
5028 | debug.vect[0].a.proc = proc; | |
5029 | #endif | |
5030 | goto tail; | |
904a077d | 5031 | case scm_tcs_struct: |
f3d2630a MD |
5032 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
5033 | { | |
5034 | #ifdef DEVAL | |
5035 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
5036 | #else | |
5037 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
5038 | #endif | |
195847fa | 5039 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 5040 | } |
2ca0d207 | 5041 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 5042 | { |
504d99c5 | 5043 | /* operator */ |
da7f71d7 MD |
5044 | #ifdef DEVAL |
5045 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
5046 | #else | |
5047 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
5048 | #endif | |
5049 | arg1 = proc; | |
195847fa MD |
5050 | proc = (SCM_I_ENTITYP (proc) |
5051 | ? SCM_ENTITY_PROCEDURE (proc) | |
5052 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
5053 | #ifdef DEVAL |
5054 | debug.vect[0].a.proc = proc; | |
5055 | debug.vect[0].a.args = scm_cons (arg1, args); | |
5056 | #endif | |
195847fa MD |
5057 | if (SCM_NIMP (proc)) |
5058 | goto tail; | |
5059 | else | |
5060 | goto badproc; | |
da7f71d7 | 5061 | } |
2ca0d207 DH |
5062 | else |
5063 | goto badproc; | |
0f2d19dd JB |
5064 | default: |
5065 | badproc: | |
db4b4ca6 | 5066 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
5067 | } |
5068 | #ifdef DEVAL | |
6dbd0af5 | 5069 | exit: |
5132eef0 | 5070 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 5071 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 5072 | { |
b7ff98dd | 5073 | SCM_CLEAR_TRACED_FRAME (debug); |
7c9c0169 | 5074 | arg1 = scm_make_debugobj (&debug); |
d95c0b76 | 5075 | SCM_TRAPS_P = 0; |
7c9c0169 | 5076 | arg1 = scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 5077 | SCM_TRAPS_P = 1; |
7c9c0169 NJ |
5078 | if (scm_is_pair (arg1) && scm_is_eq (SCM_CAR (arg1), sym_instead)) |
5079 | proc = SCM_CDR (arg1); | |
6dbd0af5 | 5080 | } |
9de87eea | 5081 | scm_i_set_last_debug_frame (debug.prev); |
0f2d19dd JB |
5082 | return proc; |
5083 | #endif | |
5084 | } | |
5085 | ||
6dbd0af5 MD |
5086 | |
5087 | /* SECTION: The rest of this file is only read once. | |
5088 | */ | |
5089 | ||
0f2d19dd JB |
5090 | #ifndef DEVAL |
5091 | ||
504d99c5 MD |
5092 | /* Trampolines |
5093 | * | |
5094 | * Trampolines make it possible to move procedure application dispatch | |
5095 | * outside inner loops. The motivation was clean implementation of | |
5096 | * efficient replacements of R5RS primitives in SRFI-1. | |
5097 | * | |
5098 | * The semantics is clear: scm_trampoline_N returns an optimized | |
5099 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
5100 | * on N args). | |
5101 | * | |
5102 | * Applying the optimization to map and for-each increased efficiency | |
5103 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
5104 | * before. | |
5105 | */ | |
5106 | ||
756414cf MD |
5107 | static SCM |
5108 | call_subr0_0 (SCM proc) | |
5109 | { | |
5110 | return SCM_SUBRF (proc) (); | |
5111 | } | |
5112 | ||
5113 | static SCM | |
5114 | call_subr1o_0 (SCM proc) | |
5115 | { | |
5116 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
5117 | } | |
5118 | ||
5119 | static SCM | |
5120 | call_lsubr_0 (SCM proc) | |
5121 | { | |
5122 | return SCM_SUBRF (proc) (SCM_EOL); | |
5123 | } | |
5124 | ||
5125 | SCM | |
5126 | scm_i_call_closure_0 (SCM proc) | |
5127 | { | |
6a3f13f0 DH |
5128 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5129 | SCM_EOL, | |
5130 | SCM_ENV (proc)); | |
5131 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5132 | return result; |
756414cf MD |
5133 | } |
5134 | ||
5135 | scm_t_trampoline_0 | |
5136 | scm_trampoline_0 (SCM proc) | |
5137 | { | |
2510c810 DH |
5138 | scm_t_trampoline_0 trampoline; |
5139 | ||
756414cf | 5140 | if (SCM_IMP (proc)) |
d0b07b5d | 5141 | return NULL; |
2510c810 | 5142 | |
756414cf MD |
5143 | switch (SCM_TYP7 (proc)) |
5144 | { | |
5145 | case scm_tc7_subr_0: | |
2510c810 DH |
5146 | trampoline = call_subr0_0; |
5147 | break; | |
756414cf | 5148 | case scm_tc7_subr_1o: |
2510c810 DH |
5149 | trampoline = call_subr1o_0; |
5150 | break; | |
756414cf | 5151 | case scm_tc7_lsubr: |
2510c810 DH |
5152 | trampoline = call_lsubr_0; |
5153 | break; | |
756414cf MD |
5154 | case scm_tcs_closures: |
5155 | { | |
5156 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 5157 | if (scm_is_null (formals) || !scm_is_pair (formals)) |
2510c810 | 5158 | trampoline = scm_i_call_closure_0; |
756414cf | 5159 | else |
d0b07b5d | 5160 | return NULL; |
2510c810 | 5161 | break; |
756414cf MD |
5162 | } |
5163 | case scm_tcs_struct: | |
5164 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5165 | trampoline = scm_call_generic_0; |
2ca0d207 | 5166 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5167 | trampoline = scm_call_0; |
5168 | else | |
5169 | return NULL; | |
5170 | break; | |
756414cf MD |
5171 | case scm_tc7_smob: |
5172 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5173 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 5174 | else |
d0b07b5d | 5175 | return NULL; |
2510c810 | 5176 | break; |
756414cf MD |
5177 | case scm_tc7_asubr: |
5178 | case scm_tc7_rpsubr: | |
5179 | case scm_tc7_cclo: | |
5180 | case scm_tc7_pws: | |
2510c810 DH |
5181 | trampoline = scm_call_0; |
5182 | break; | |
756414cf | 5183 | default: |
2510c810 | 5184 | return NULL; /* not applicable on zero arguments */ |
756414cf | 5185 | } |
2510c810 DH |
5186 | /* We only reach this point if a valid trampoline was determined. */ |
5187 | ||
5188 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5189 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
434f2f7a | 5190 | if (scm_debug_mode_p) |
2510c810 DH |
5191 | return scm_call_0; |
5192 | else | |
5193 | return trampoline; | |
756414cf MD |
5194 | } |
5195 | ||
504d99c5 MD |
5196 | static SCM |
5197 | call_subr1_1 (SCM proc, SCM arg1) | |
5198 | { | |
5199 | return SCM_SUBRF (proc) (arg1); | |
5200 | } | |
5201 | ||
9ed24633 MD |
5202 | static SCM |
5203 | call_subr2o_1 (SCM proc, SCM arg1) | |
5204 | { | |
5205 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
5206 | } | |
5207 | ||
504d99c5 MD |
5208 | static SCM |
5209 | call_lsubr_1 (SCM proc, SCM arg1) | |
5210 | { | |
5211 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
5212 | } | |
5213 | ||
5214 | static SCM | |
5215 | call_dsubr_1 (SCM proc, SCM arg1) | |
5216 | { | |
e11e83f3 | 5217 | if (SCM_I_INUMP (arg1)) |
504d99c5 | 5218 | { |
d9a67fc4 | 5219 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
504d99c5 MD |
5220 | } |
5221 | else if (SCM_REALP (arg1)) | |
5222 | { | |
d9a67fc4 | 5223 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
504d99c5 | 5224 | } |
504d99c5 | 5225 | else if (SCM_BIGP (arg1)) |
f92e85f7 | 5226 | { |
d9a67fc4 | 5227 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
5228 | } |
5229 | else if (SCM_FRACTIONP (arg1)) | |
5230 | { | |
d9a67fc4 | 5231 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 5232 | } |
504d99c5 | 5233 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 5234 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
504d99c5 MD |
5235 | } |
5236 | ||
5237 | static SCM | |
5238 | call_cxr_1 (SCM proc, SCM arg1) | |
5239 | { | |
a61f4e0c | 5240 | return scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc)); |
504d99c5 MD |
5241 | } |
5242 | ||
5243 | static SCM | |
5244 | call_closure_1 (SCM proc, SCM arg1) | |
5245 | { | |
6a3f13f0 DH |
5246 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5247 | scm_list_1 (arg1), | |
5248 | SCM_ENV (proc)); | |
5249 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5250 | return result; |
504d99c5 MD |
5251 | } |
5252 | ||
5253 | scm_t_trampoline_1 | |
5254 | scm_trampoline_1 (SCM proc) | |
5255 | { | |
2510c810 DH |
5256 | scm_t_trampoline_1 trampoline; |
5257 | ||
504d99c5 | 5258 | if (SCM_IMP (proc)) |
d0b07b5d | 5259 | return NULL; |
2510c810 | 5260 | |
504d99c5 MD |
5261 | switch (SCM_TYP7 (proc)) |
5262 | { | |
5263 | case scm_tc7_subr_1: | |
5264 | case scm_tc7_subr_1o: | |
2510c810 DH |
5265 | trampoline = call_subr1_1; |
5266 | break; | |
9ed24633 | 5267 | case scm_tc7_subr_2o: |
2510c810 DH |
5268 | trampoline = call_subr2o_1; |
5269 | break; | |
504d99c5 | 5270 | case scm_tc7_lsubr: |
2510c810 DH |
5271 | trampoline = call_lsubr_1; |
5272 | break; | |
14b18ed6 | 5273 | case scm_tc7_dsubr: |
2510c810 DH |
5274 | trampoline = call_dsubr_1; |
5275 | break; | |
504d99c5 | 5276 | case scm_tc7_cxr: |
2510c810 DH |
5277 | trampoline = call_cxr_1; |
5278 | break; | |
504d99c5 MD |
5279 | case scm_tcs_closures: |
5280 | { | |
5281 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5282 | if (!scm_is_null (formals) |
5283 | && (!scm_is_pair (formals) || !scm_is_pair (SCM_CDR (formals)))) | |
2510c810 | 5284 | trampoline = call_closure_1; |
504d99c5 | 5285 | else |
d0b07b5d | 5286 | return NULL; |
2510c810 | 5287 | break; |
504d99c5 MD |
5288 | } |
5289 | case scm_tcs_struct: | |
5290 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5291 | trampoline = scm_call_generic_1; |
2ca0d207 | 5292 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5293 | trampoline = scm_call_1; |
5294 | else | |
5295 | return NULL; | |
5296 | break; | |
504d99c5 MD |
5297 | case scm_tc7_smob: |
5298 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5299 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 5300 | else |
d0b07b5d | 5301 | return NULL; |
2510c810 | 5302 | break; |
504d99c5 MD |
5303 | case scm_tc7_asubr: |
5304 | case scm_tc7_rpsubr: | |
5305 | case scm_tc7_cclo: | |
5306 | case scm_tc7_pws: | |
2510c810 DH |
5307 | trampoline = scm_call_1; |
5308 | break; | |
504d99c5 | 5309 | default: |
d0b07b5d | 5310 | return NULL; /* not applicable on one arg */ |
504d99c5 | 5311 | } |
2510c810 DH |
5312 | /* We only reach this point if a valid trampoline was determined. */ |
5313 | ||
5314 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5315 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
434f2f7a | 5316 | if (scm_debug_mode_p) |
2510c810 DH |
5317 | return scm_call_1; |
5318 | else | |
5319 | return trampoline; | |
504d99c5 MD |
5320 | } |
5321 | ||
5322 | static SCM | |
5323 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5324 | { | |
5325 | return SCM_SUBRF (proc) (arg1, arg2); | |
5326 | } | |
5327 | ||
9ed24633 MD |
5328 | static SCM |
5329 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5330 | { | |
5331 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
5332 | } | |
5333 | ||
504d99c5 MD |
5334 | static SCM |
5335 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
5336 | { | |
5337 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
5338 | } | |
5339 | ||
5340 | static SCM | |
5341 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
5342 | { | |
6a3f13f0 DH |
5343 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5344 | scm_list_2 (arg1, arg2), | |
5345 | SCM_ENV (proc)); | |
5346 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5347 | return result; |
504d99c5 MD |
5348 | } |
5349 | ||
5350 | scm_t_trampoline_2 | |
5351 | scm_trampoline_2 (SCM proc) | |
5352 | { | |
2510c810 DH |
5353 | scm_t_trampoline_2 trampoline; |
5354 | ||
504d99c5 | 5355 | if (SCM_IMP (proc)) |
d0b07b5d | 5356 | return NULL; |
2510c810 | 5357 | |
504d99c5 MD |
5358 | switch (SCM_TYP7 (proc)) |
5359 | { | |
5360 | case scm_tc7_subr_2: | |
5361 | case scm_tc7_subr_2o: | |
5362 | case scm_tc7_rpsubr: | |
5363 | case scm_tc7_asubr: | |
2510c810 DH |
5364 | trampoline = call_subr2_2; |
5365 | break; | |
9ed24633 | 5366 | case scm_tc7_lsubr_2: |
2510c810 DH |
5367 | trampoline = call_lsubr2_2; |
5368 | break; | |
504d99c5 | 5369 | case scm_tc7_lsubr: |
2510c810 DH |
5370 | trampoline = call_lsubr_2; |
5371 | break; | |
504d99c5 MD |
5372 | case scm_tcs_closures: |
5373 | { | |
5374 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5375 | if (!scm_is_null (formals) |
5376 | && (!scm_is_pair (formals) | |
5377 | || (!scm_is_null (SCM_CDR (formals)) | |
5378 | && (!scm_is_pair (SCM_CDR (formals)) | |
5379 | || !scm_is_pair (SCM_CDDR (formals)))))) | |
2510c810 | 5380 | trampoline = call_closure_2; |
504d99c5 | 5381 | else |
d0b07b5d | 5382 | return NULL; |
2510c810 | 5383 | break; |
504d99c5 MD |
5384 | } |
5385 | case scm_tcs_struct: | |
5386 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5387 | trampoline = scm_call_generic_2; |
2ca0d207 | 5388 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5389 | trampoline = scm_call_2; |
5390 | else | |
5391 | return NULL; | |
5392 | break; | |
504d99c5 MD |
5393 | case scm_tc7_smob: |
5394 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5395 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5396 | else |
d0b07b5d | 5397 | return NULL; |
2510c810 | 5398 | break; |
504d99c5 MD |
5399 | case scm_tc7_cclo: |
5400 | case scm_tc7_pws: | |
2510c810 DH |
5401 | trampoline = scm_call_2; |
5402 | break; | |
504d99c5 | 5403 | default: |
d0b07b5d | 5404 | return NULL; /* not applicable on two args */ |
504d99c5 | 5405 | } |
2510c810 DH |
5406 | /* We only reach this point if a valid trampoline was determined. */ |
5407 | ||
5408 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5409 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
434f2f7a | 5410 | if (scm_debug_mode_p) |
2510c810 DH |
5411 | return scm_call_2; |
5412 | else | |
5413 | return trampoline; | |
504d99c5 MD |
5414 | } |
5415 | ||
d9c393f5 JB |
5416 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5417 | ||
47c3f06d | 5418 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5419 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5420 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5421 | static inline void |
47c3f06d | 5422 | check_map_args (SCM argv, |
c014a02e | 5423 | long len, |
47c3f06d MD |
5424 | SCM gf, |
5425 | SCM proc, | |
5426 | SCM args, | |
5427 | const char *who) | |
d9c393f5 | 5428 | { |
c014a02e | 5429 | long i; |
d9c393f5 | 5430 | |
4057a3e0 | 5431 | for (i = SCM_SIMPLE_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5432 | { |
4057a3e0 MV |
5433 | SCM elt = SCM_SIMPLE_VECTOR_REF (argv, i); |
5434 | long elt_len = scm_ilength (elt); | |
d9c393f5 JB |
5435 | |
5436 | if (elt_len < 0) | |
47c3f06d MD |
5437 | { |
5438 | if (gf) | |
5439 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5440 | else | |
4057a3e0 | 5441 | scm_wrong_type_arg (who, i + 2, elt); |
47c3f06d | 5442 | } |
d9c393f5 JB |
5443 | |
5444 | if (elt_len != len) | |
4057a3e0 | 5445 | scm_out_of_range_pos (who, elt, scm_from_long (i + 2)); |
d9c393f5 | 5446 | } |
d9c393f5 JB |
5447 | } |
5448 | ||
5449 | ||
47c3f06d | 5450 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5451 | |
368bf056 MD |
5452 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5453 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5454 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5455 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5456 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5457 | */ |
5458 | ||
0f2d19dd | 5459 | SCM |
1bbd0b84 | 5460 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5461 | #define FUNC_NAME s_map |
0f2d19dd | 5462 | { |
c014a02e | 5463 | long i, len; |
0f2d19dd JB |
5464 | SCM res = SCM_EOL; |
5465 | SCM *pres = &res; | |
0f2d19dd | 5466 | |
d9c393f5 | 5467 | len = scm_ilength (arg1); |
47c3f06d MD |
5468 | SCM_GASSERTn (len >= 0, |
5469 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5470 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5471 | if (scm_is_null (args)) |
0f2d19dd | 5472 | { |
504d99c5 MD |
5473 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5474 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5475 | while (SCM_NIMP (arg1)) | |
5476 | { | |
5477 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5478 | pres = SCM_CDRLOC (*pres); | |
5479 | arg1 = SCM_CDR (arg1); | |
5480 | } | |
5481 | return res; | |
5482 | } | |
a61f4e0c | 5483 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5484 | { |
5485 | SCM arg2 = SCM_CAR (args); | |
5486 | int len2 = scm_ilength (arg2); | |
5487 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5488 | SCM_GASSERTn (call, | |
5489 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5490 | SCM_GASSERTn (len2 >= 0, | |
5491 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5492 | if (len2 != len) | |
5493 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5494 | while (SCM_NIMP (arg1)) |
5495 | { | |
504d99c5 | 5496 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5497 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5498 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5499 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5500 | } |
5501 | return res; | |
5502 | } | |
05b15362 DH |
5503 | arg1 = scm_cons (arg1, args); |
5504 | args = scm_vector (arg1); | |
47c3f06d | 5505 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5506 | while (1) |
5507 | { | |
5508 | arg1 = SCM_EOL; | |
4057a3e0 | 5509 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5510 | { |
4057a3e0 MV |
5511 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5512 | if (SCM_IMP (elt)) | |
d9c393f5 | 5513 | return res; |
4057a3e0 MV |
5514 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5515 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd | 5516 | } |
8ea46249 | 5517 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5518 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5519 | } |
5520 | } | |
af45e3b0 | 5521 | #undef FUNC_NAME |
0f2d19dd JB |
5522 | |
5523 | ||
47c3f06d | 5524 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5525 | |
0f2d19dd | 5526 | SCM |
1bbd0b84 | 5527 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5528 | #define FUNC_NAME s_for_each |
0f2d19dd | 5529 | { |
c014a02e | 5530 | long i, len; |
d9c393f5 | 5531 | len = scm_ilength (arg1); |
47c3f06d MD |
5532 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5533 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5534 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5535 | if (scm_is_null (args)) |
0f2d19dd | 5536 | { |
504d99c5 MD |
5537 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5538 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5539 | while (SCM_NIMP (arg1)) | |
5540 | { | |
5541 | call (proc, SCM_CAR (arg1)); | |
5542 | arg1 = SCM_CDR (arg1); | |
5543 | } | |
5544 | return SCM_UNSPECIFIED; | |
5545 | } | |
a61f4e0c | 5546 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5547 | { |
5548 | SCM arg2 = SCM_CAR (args); | |
5549 | int len2 = scm_ilength (arg2); | |
5550 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5551 | SCM_GASSERTn (call, g_for_each, | |
5552 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5553 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5554 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5555 | if (len2 != len) | |
5556 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5557 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5558 | { |
504d99c5 | 5559 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5560 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5561 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5562 | } |
5563 | return SCM_UNSPECIFIED; | |
5564 | } | |
05b15362 DH |
5565 | arg1 = scm_cons (arg1, args); |
5566 | args = scm_vector (arg1); | |
47c3f06d | 5567 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5568 | while (1) |
5569 | { | |
5570 | arg1 = SCM_EOL; | |
4057a3e0 | 5571 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5572 | { |
4057a3e0 MV |
5573 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5574 | if (SCM_IMP (elt)) | |
c96d76b8 | 5575 | return SCM_UNSPECIFIED; |
4057a3e0 MV |
5576 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5577 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd JB |
5578 | } |
5579 | scm_apply (proc, arg1, SCM_EOL); | |
5580 | } | |
5581 | } | |
af45e3b0 | 5582 | #undef FUNC_NAME |
0f2d19dd | 5583 | |
1cc91f1b | 5584 | |
0f2d19dd | 5585 | SCM |
6e8d25a6 | 5586 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5587 | { |
16d4699b MV |
5588 | SCM z; |
5589 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5590 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5591 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5592 | return z; |
5593 | } | |
5594 | ||
5595 | ||
92c2555f | 5596 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5597 | |
0f2d19dd | 5598 | SCM |
6e8d25a6 | 5599 | scm_makprom (SCM code) |
0f2d19dd | 5600 | { |
28d52ebb MD |
5601 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5602 | SCM_UNPACK (code), | |
9de87eea MV |
5603 | scm_make_recursive_mutex ()); |
5604 | } | |
5605 | ||
5606 | static SCM | |
5607 | promise_mark (SCM promise) | |
5608 | { | |
5609 | scm_gc_mark (SCM_PROMISE_MUTEX (promise)); | |
5610 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd JB |
5611 | } |
5612 | ||
28d52ebb MD |
5613 | static size_t |
5614 | promise_free (SCM promise) | |
5615 | { | |
28d52ebb MD |
5616 | return 0; |
5617 | } | |
1cc91f1b | 5618 | |
0f2d19dd | 5619 | static int |
e841c3e0 | 5620 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5621 | { |
19402679 | 5622 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5623 | scm_puts ("#<promise ", port); |
19402679 | 5624 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5625 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5626 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5627 | scm_putc ('>', port); |
0f2d19dd JB |
5628 | return !0; |
5629 | } | |
5630 | ||
3b3b36dd | 5631 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5632 | (SCM promise), |
67e8151b MG |
5633 | "If the promise @var{x} has not been computed yet, compute and\n" |
5634 | "return @var{x}, otherwise just return the previously computed\n" | |
5635 | "value.") | |
1bbd0b84 | 5636 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5637 | { |
28d52ebb | 5638 | SCM_VALIDATE_SMOB (1, promise, promise); |
9de87eea | 5639 | scm_lock_mutex (SCM_PROMISE_MUTEX (promise)); |
28d52ebb | 5640 | if (!SCM_PROMISE_COMPUTED_P (promise)) |
0f2d19dd | 5641 | { |
28d52ebb MD |
5642 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5643 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5644 | { |
28d52ebb MD |
5645 | SCM_SET_PROMISE_DATA (promise, ans); |
5646 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5647 | } |
5648 | } | |
9de87eea | 5649 | scm_unlock_mutex (SCM_PROMISE_MUTEX (promise)); |
28d52ebb | 5650 | return SCM_PROMISE_DATA (promise); |
0f2d19dd | 5651 | } |
1bbd0b84 | 5652 | #undef FUNC_NAME |
0f2d19dd | 5653 | |
445f675c | 5654 | |
a1ec6916 | 5655 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5656 | (SCM obj), |
b380b885 | 5657 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5658 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5659 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5660 | { |
7888309b | 5661 | return scm_from_bool (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5662 | } |
1bbd0b84 | 5663 | #undef FUNC_NAME |
0f2d19dd | 5664 | |
445f675c | 5665 | |
a1ec6916 | 5666 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5667 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5668 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5669 | "Any source properties associated with @var{xorig} are also associated\n" | |
5670 | "with the new pair.") | |
1bbd0b84 | 5671 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5672 | { |
5673 | SCM p, z; | |
16d4699b | 5674 | z = scm_cons (x, y); |
26d5b9b4 MD |
5675 | /* Copy source properties possibly associated with xorig. */ |
5676 | p = scm_whash_lookup (scm_source_whash, xorig); | |
7888309b | 5677 | if (scm_is_true (p)) |
26d5b9b4 MD |
5678 | scm_whash_insert (scm_source_whash, z, p); |
5679 | return z; | |
5680 | } | |
1bbd0b84 | 5681 | #undef FUNC_NAME |
26d5b9b4 | 5682 | |
445f675c | 5683 | |
62360b89 DH |
5684 | /* The function scm_copy_tree is used to copy an expression tree to allow the |
5685 | * memoizer to modify the expression during memoization. scm_copy_tree | |
5686 | * creates deep copies of pairs and vectors, but not of any other data types, | |
5687 | * since only pairs and vectors will be parsed by the memoizer. | |
5688 | * | |
5689 | * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise | |
5690 | * pattern is used to detect cycles. In fact, the pattern is used in two | |
5691 | * dimensions, vertical (indicated in the code by the variable names 'hare' | |
5692 | * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both | |
5693 | * dimensions, the hare/rabbit will take two steps when the tortoise/turtle | |
5694 | * takes one. | |
5695 | * | |
5696 | * The vertical dimension corresponds to recursive calls to function | |
5697 | * copy_tree: This happens when descending into vector elements, into cars of | |
5698 | * lists and into the cdr of an improper list. In this dimension, the | |
5699 | * tortoise follows the hare by using the processor stack: Every stack frame | |
5700 | * will hold an instance of struct t_trace. These instances are connected in | |
5701 | * a way that represents the trace of the hare, which thus can be followed by | |
5702 | * the tortoise. The tortoise will always point to struct t_trace instances | |
5703 | * relating to SCM objects that have already been copied. Thus, a cycle is | |
5704 | * detected if the tortoise and the hare point to the same object, | |
5705 | * | |
5706 | * The horizontal dimension is within one execution of copy_tree, when the | |
5707 | * function cdr's along the pairs of a list. This is the standard | |
5708 | * hare-and-tortoise implementation, found several times in guile. */ | |
5709 | ||
5710 | struct t_trace { | |
2b829bbb KR |
5711 | struct t_trace *trace; /* These pointers form a trace along the stack. */ |
5712 | SCM obj; /* The object handled at the respective stack frame.*/ | |
62360b89 DH |
5713 | }; |
5714 | ||
5715 | static SCM | |
5716 | copy_tree ( | |
5717 | struct t_trace *const hare, | |
5718 | struct t_trace *tortoise, | |
5719 | unsigned int tortoise_delay ) | |
5720 | { | |
4057a3e0 | 5721 | if (!scm_is_pair (hare->obj) && !scm_is_simple_vector (hare->obj)) |
62360b89 DH |
5722 | { |
5723 | return hare->obj; | |
5724 | } | |
5725 | else | |
5726 | { | |
5727 | /* Prepare the trace along the stack. */ | |
5728 | struct t_trace new_hare; | |
5729 | hare->trace = &new_hare; | |
5730 | ||
5731 | /* The tortoise will make its step after the delay has elapsed. Note | |
5732 | * that in contrast to the typical hare-and-tortoise pattern, the step | |
5733 | * of the tortoise happens before the hare takes its steps. This is, in | |
5734 | * principle, no problem, except for the start of the algorithm: Then, | |
5fb64383 | 5735 | * it has to be made sure that the hare actually gets its advantage of |
62360b89 DH |
5736 | * two steps. */ |
5737 | if (tortoise_delay == 0) | |
5738 | { | |
5739 | tortoise_delay = 1; | |
5740 | tortoise = tortoise->trace; | |
bc36d050 | 5741 | ASSERT_SYNTAX (!scm_is_eq (hare->obj, tortoise->obj), |
62360b89 DH |
5742 | s_bad_expression, hare->obj); |
5743 | } | |
5744 | else | |
5745 | { | |
5746 | --tortoise_delay; | |
5747 | } | |
5748 | ||
4057a3e0 | 5749 | if (scm_is_simple_vector (hare->obj)) |
62360b89 | 5750 | { |
4057a3e0 MV |
5751 | size_t length = SCM_SIMPLE_VECTOR_LENGTH (hare->obj); |
5752 | SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED); | |
62360b89 DH |
5753 | |
5754 | /* Each vector element is copied by recursing into copy_tree, having | |
5755 | * the tortoise follow the hare into the depths of the stack. */ | |
5756 | unsigned long int i; | |
5757 | for (i = 0; i < length; ++i) | |
5758 | { | |
5759 | SCM new_element; | |
4057a3e0 | 5760 | new_hare.obj = SCM_SIMPLE_VECTOR_REF (hare->obj, i); |
62360b89 | 5761 | new_element = copy_tree (&new_hare, tortoise, tortoise_delay); |
4057a3e0 | 5762 | SCM_SIMPLE_VECTOR_SET (new_vector, i, new_element); |
62360b89 DH |
5763 | } |
5764 | ||
5765 | return new_vector; | |
5766 | } | |
2b829bbb | 5767 | else /* scm_is_pair (hare->obj) */ |
62360b89 DH |
5768 | { |
5769 | SCM result; | |
5770 | SCM tail; | |
5771 | ||
5772 | SCM rabbit = hare->obj; | |
5773 | SCM turtle = hare->obj; | |
5774 | ||
5775 | SCM copy; | |
5776 | ||
5777 | /* The first pair of the list is treated specially, in order to | |
5778 | * preserve a potential source code position. */ | |
5779 | result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL); | |
5780 | new_hare.obj = SCM_CAR (rabbit); | |
5781 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5782 | SCM_SETCAR (tail, copy); | |
5783 | ||
5784 | /* The remaining pairs of the list are copied by, horizontally, | |
5785 | * having the turtle follow the rabbit, and, vertically, having the | |
5786 | * tortoise follow the hare into the depths of the stack. */ | |
5787 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5788 | while (scm_is_pair (rabbit)) |
62360b89 DH |
5789 | { |
5790 | new_hare.obj = SCM_CAR (rabbit); | |
5791 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5792 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5793 | tail = SCM_CDR (tail); | |
5794 | ||
5795 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5796 | if (scm_is_pair (rabbit)) |
62360b89 DH |
5797 | { |
5798 | new_hare.obj = SCM_CAR (rabbit); | |
5799 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5800 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5801 | tail = SCM_CDR (tail); | |
5802 | rabbit = SCM_CDR (rabbit); | |
5803 | ||
5804 | turtle = SCM_CDR (turtle); | |
bc36d050 | 5805 | ASSERT_SYNTAX (!scm_is_eq (rabbit, turtle), |
62360b89 DH |
5806 | s_bad_expression, rabbit); |
5807 | } | |
5808 | } | |
5809 | ||
5810 | /* We have to recurse into copy_tree again for the last cdr, in | |
5811 | * order to handle the situation that it holds a vector. */ | |
5812 | new_hare.obj = rabbit; | |
5813 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5814 | SCM_SETCDR (tail, copy); | |
5815 | ||
5816 | return result; | |
5817 | } | |
5818 | } | |
5819 | } | |
5820 | ||
a1ec6916 | 5821 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5822 | (SCM obj), |
b380b885 | 5823 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
bfefbf18 | 5824 | "the new data structure. @code{copy-tree} recurses down the\n" |
b380b885 MD |
5825 | "contents of both pairs and vectors (since both cons cells and vector\n" |
5826 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5827 | "any other object.") | |
1bbd0b84 | 5828 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd | 5829 | { |
62360b89 DH |
5830 | /* Prepare the trace along the stack. */ |
5831 | struct t_trace trace; | |
5832 | trace.obj = obj; | |
5833 | ||
5834 | /* In function copy_tree, if the tortoise makes its step, it will do this | |
5835 | * before the hare has the chance to move. Thus, we have to make sure that | |
5836 | * the very first step of the tortoise will not happen after the hare has | |
5837 | * really made two steps. This is achieved by passing '2' as the initial | |
5838 | * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare | |
5839 | * a bigger advantage may improve performance slightly. */ | |
5840 | return copy_tree (&trace, &trace, 2); | |
0f2d19dd | 5841 | } |
1bbd0b84 | 5842 | #undef FUNC_NAME |
0f2d19dd | 5843 | |
1cc91f1b | 5844 | |
4163eb72 MV |
5845 | /* We have three levels of EVAL here: |
5846 | ||
5847 | - scm_i_eval (exp, env) | |
5848 | ||
5849 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5850 | structure as used by the actual tree code evaluator. When ENV is | |
5851 | a top-level environment, then changes to the current module are | |
a513ead3 | 5852 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5853 | the current module. |
5854 | ||
5855 | - scm_primitive_eval (exp) | |
5856 | ||
5857 | evaluates EXP in the top-level environment as determined by the | |
5858 | current module. This is done by constructing a suitable | |
5859 | environment and calling scm_i_eval. Thus, changes to the | |
5860 | top-level module are tracked normally. | |
5861 | ||
9de87eea | 5862 | - scm_eval (exp, mod_or_state) |
4163eb72 | 5863 | |
9de87eea MV |
5864 | evaluates EXP while MOD_OR_STATE is the current module or current |
5865 | dynamic state (as appropriate). This is done by setting the | |
5866 | current module (or dynamic state) to MOD_OR_STATE, invoking | |
5867 | scm_primitive_eval on EXP, and then restoring the current module | |
5868 | (or dynamic state) to the value it had previously. That is, | |
5869 | while EXP is evaluated, changes to the current module (or dynamic | |
5870 | state) are tracked, but these changes do not persist when | |
4163eb72 MV |
5871 | scm_eval returns. |
5872 | ||
5873 | For each level of evals, there are two variants, distinguished by a | |
5874 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5875 | variant can destructively modify EXP into something completely | |
5876 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5877 | _x variants should not ever be used again for anything. So when in | |
5878 | doubt, use the ordinary variant. | |
5879 | ||
5880 | */ | |
5881 | ||
0f2d19dd | 5882 | SCM |
68d8be66 | 5883 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5884 | { |
cc95e00a | 5885 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5886 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5887 | else | |
385609b9 | 5888 | return SCM_I_XEVAL (exp, env); |
0f2d19dd JB |
5889 | } |
5890 | ||
68d8be66 MD |
5891 | SCM |
5892 | scm_i_eval (SCM exp, SCM env) | |
5893 | { | |
26fb6390 | 5894 | exp = scm_copy_tree (exp); |
cc95e00a | 5895 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5896 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5897 | else | |
385609b9 | 5898 | return SCM_I_XEVAL (exp, env); |
68d8be66 MD |
5899 | } |
5900 | ||
5901 | SCM | |
4163eb72 | 5902 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5903 | { |
a513ead3 | 5904 | SCM env; |
bcdab802 | 5905 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5906 | if (SCM_NIMP (transformer)) |
fdc28395 | 5907 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5908 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5909 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5910 | } |
5911 | ||
4163eb72 MV |
5912 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5913 | (SCM exp), | |
2069af38 | 5914 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5915 | "the current module.") |
5916 | #define FUNC_NAME s_scm_primitive_eval | |
5917 | { | |
a513ead3 | 5918 | SCM env; |
bcdab802 | 5919 | SCM transformer = scm_current_module_transformer (); |
7888309b | 5920 | if (scm_is_true (transformer)) |
fdc28395 | 5921 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5922 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5923 | return scm_i_eval (exp, env); |
5924 | } | |
5925 | #undef FUNC_NAME | |
5926 | ||
6bff1368 | 5927 | |
68d8be66 MD |
5928 | /* Eval does not take the second arg optionally. This is intentional |
5929 | * in order to be R5RS compatible, and to prepare for the new module | |
5930 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5931 | * environment explicit. */ |
549e6ec6 | 5932 | |
4163eb72 | 5933 | SCM |
9de87eea | 5934 | scm_eval_x (SCM exp, SCM module_or_state) |
4163eb72 | 5935 | { |
9de87eea | 5936 | SCM res; |
4163eb72 | 5937 | |
661ae7ab | 5938 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
9de87eea | 5939 | if (scm_is_dynamic_state (module_or_state)) |
661ae7ab | 5940 | scm_dynwind_current_dynamic_state (module_or_state); |
9de87eea | 5941 | else |
661ae7ab | 5942 | scm_dynwind_current_module (module_or_state); |
4163eb72 | 5943 | |
9de87eea MV |
5944 | res = scm_primitive_eval_x (exp); |
5945 | ||
661ae7ab | 5946 | scm_dynwind_end (); |
9de87eea | 5947 | return res; |
4163eb72 | 5948 | } |
09074dbf | 5949 | |
68d8be66 | 5950 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
9de87eea | 5951 | (SCM exp, SCM module_or_state), |
4163eb72 | 5952 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" |
9de87eea MV |
5953 | "in the top-level environment specified by\n" |
5954 | "@var{module_or_state}.\n" | |
8f85c0c6 | 5955 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
9de87eea MV |
5956 | "@var{module_or_state} is made the current module when\n" |
5957 | "it is a module, or the current dynamic state when it is\n" | |
5958 | "a dynamic state." | |
6be1fab9 | 5959 | "Example: (eval '(+ 1 2) (interaction-environment))") |
1bbd0b84 | 5960 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5961 | { |
9de87eea MV |
5962 | SCM res; |
5963 | ||
661ae7ab | 5964 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
9de87eea | 5965 | if (scm_is_dynamic_state (module_or_state)) |
661ae7ab | 5966 | scm_dynwind_current_dynamic_state (module_or_state); |
9de87eea | 5967 | else |
661ae7ab | 5968 | scm_dynwind_current_module (module_or_state); |
9de87eea MV |
5969 | |
5970 | res = scm_primitive_eval (exp); | |
09074dbf | 5971 | |
661ae7ab | 5972 | scm_dynwind_end (); |
9de87eea | 5973 | return res; |
0f2d19dd | 5974 | } |
1bbd0b84 | 5975 | #undef FUNC_NAME |
0f2d19dd | 5976 | |
6dbd0af5 | 5977 | |
434f2f7a | 5978 | /* At this point, deval and scm_dapply are generated. |
6dbd0af5 MD |
5979 | */ |
5980 | ||
a44a9715 DH |
5981 | #define DEVAL |
5982 | #include "eval.c" | |
0f2d19dd | 5983 | |
1cc91f1b | 5984 | |
434f2f7a DH |
5985 | #if (SCM_ENABLE_DEPRECATED == 1) |
5986 | ||
5987 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5988 | SCM scm_ceval (SCM x, SCM env) | |
5989 | { | |
a61f4e0c | 5990 | if (scm_is_pair (x)) |
434f2f7a | 5991 | return ceval (x, env); |
cc95e00a | 5992 | else if (scm_is_symbol (x)) |
434f2f7a DH |
5993 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
5994 | else | |
385609b9 | 5995 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
5996 | } |
5997 | ||
5998 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5999 | SCM scm_deval (SCM x, SCM env) | |
6000 | { | |
a61f4e0c | 6001 | if (scm_is_pair (x)) |
434f2f7a | 6002 | return deval (x, env); |
cc95e00a | 6003 | else if (scm_is_symbol (x)) |
434f2f7a DH |
6004 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
6005 | else | |
385609b9 | 6006 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
6007 | } |
6008 | ||
6009 | static SCM | |
6010 | dispatching_eval (SCM x, SCM env) | |
6011 | { | |
6012 | if (scm_debug_mode_p) | |
6013 | return scm_deval (x, env); | |
6014 | else | |
6015 | return scm_ceval (x, env); | |
6016 | } | |
6017 | ||
6018 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
6019 | SCM (*scm_ceval_ptr) (SCM x, SCM env) = dispatching_eval; | |
6020 | ||
6021 | #endif | |
6022 | ||
6023 | ||
0f2d19dd JB |
6024 | void |
6025 | scm_init_eval () | |
0f2d19dd | 6026 | { |
d1138028 MV |
6027 | scm_i_pthread_mutex_init (&source_mutex, |
6028 | scm_i_pthread_mutexattr_recursive); | |
6029 | ||
33b97402 | 6030 | scm_init_opts (scm_evaluator_traps, |
62560650 | 6031 | scm_evaluator_trap_table); |
33b97402 | 6032 | scm_init_opts (scm_eval_options_interface, |
62560650 | 6033 | scm_eval_opts); |
33b97402 | 6034 | |
f99c9c28 | 6035 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
9de87eea | 6036 | scm_set_smob_mark (scm_tc16_promise, promise_mark); |
28d52ebb | 6037 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 6038 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 6039 | |
a44a9715 DH |
6040 | undefineds = scm_list_1 (SCM_UNDEFINED); |
6041 | SCM_SETCDR (undefineds, undefineds); | |
6042 | scm_permanent_object (undefineds); | |
7c33806a | 6043 | |
a44a9715 | 6044 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 6045 | |
a44a9715 DH |
6046 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
6047 | scm_permanent_object (f_apply); | |
86d31dfe | 6048 | |
a0599745 | 6049 | #include "libguile/eval.x" |
60a49842 | 6050 | |
25eaf21a | 6051 | scm_add_feature ("delay"); |
0f2d19dd | 6052 | } |
0f2d19dd | 6053 | |
6dbd0af5 | 6054 | #endif /* !DEVAL */ |
89e00824 ML |
6055 | |
6056 | /* | |
6057 | Local Variables: | |
6058 | c-file-style: "gnu" | |
6059 | End: | |
6060 | */ | |
62560650 | 6061 |