Commit | Line | Data |
---|---|---|
c3c97a34 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005 |
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 | |
48b96f4b JB |
40 | /* AIX requires this to be the first thing in the file. The #pragma |
41 | directive is indented so pre-ANSI compilers will ignore it, rather | |
42 | than choke on it. */ | |
5862b540 | 43 | #ifndef __GNUC__ |
48b96f4b JB |
44 | # if HAVE_ALLOCA_H |
45 | # include <alloca.h> | |
46 | # else | |
47 | # ifdef _AIX | |
ac13d9d2 | 48 | # pragma alloca |
48b96f4b JB |
49 | # else |
50 | # ifndef alloca /* predefined by HP cc +Olibcalls */ | |
51 | char *alloca (); | |
52 | # endif | |
53 | # endif | |
54 | # endif | |
55 | #endif | |
56 | ||
e7313a9d | 57 | #include <assert.h> |
a0599745 | 58 | #include "libguile/_scm.h" |
21628685 DH |
59 | #include "libguile/alist.h" |
60 | #include "libguile/async.h" | |
61 | #include "libguile/continuations.h" | |
a0599745 | 62 | #include "libguile/debug.h" |
328dc9a3 | 63 | #include "libguile/deprecation.h" |
09074dbf | 64 | #include "libguile/dynwind.h" |
a0599745 | 65 | #include "libguile/eq.h" |
21628685 DH |
66 | #include "libguile/feature.h" |
67 | #include "libguile/fluids.h" | |
756414cf | 68 | #include "libguile/futures.h" |
21628685 DH |
69 | #include "libguile/goops.h" |
70 | #include "libguile/hash.h" | |
71 | #include "libguile/hashtab.h" | |
72 | #include "libguile/lang.h" | |
4610b011 | 73 | #include "libguile/list.h" |
a0599745 | 74 | #include "libguile/macros.h" |
a0599745 | 75 | #include "libguile/modules.h" |
21628685 | 76 | #include "libguile/objects.h" |
a0599745 | 77 | #include "libguile/ports.h" |
7e6e6b37 | 78 | #include "libguile/print.h" |
21628685 | 79 | #include "libguile/procprop.h" |
a0599745 | 80 | #include "libguile/root.h" |
21628685 DH |
81 | #include "libguile/smob.h" |
82 | #include "libguile/srcprop.h" | |
83 | #include "libguile/stackchk.h" | |
84 | #include "libguile/strings.h" | |
9de87eea | 85 | #include "libguile/threads.h" |
21628685 DH |
86 | #include "libguile/throw.h" |
87 | #include "libguile/validate.h" | |
a513ead3 | 88 | #include "libguile/values.h" |
21628685 | 89 | #include "libguile/vectors.h" |
a0599745 | 90 | |
a0599745 | 91 | #include "libguile/eval.h" |
89efbff4 | 92 | |
0f2d19dd JB |
93 | \f |
94 | ||
212e58ed | 95 | static SCM unmemoize_exprs (SCM expr, SCM env); |
0f572ba7 | 96 | static SCM canonicalize_define (SCM expr); |
e5156567 | 97 | static SCM *scm_lookupcar1 (SCM vloc, SCM genv, int check); |
212e58ed | 98 | static SCM unmemoize_builtin_macro (SCM expr, SCM env); |
5defc05d | 99 | static void eval_letrec_inits (SCM env, SCM init_forms, SCM **init_values_eol); |
0f572ba7 DH |
100 | |
101 | \f | |
102 | ||
e6729603 DH |
103 | /* {Syntax Errors} |
104 | * | |
105 | * This section defines the message strings for the syntax errors that can be | |
106 | * detected during memoization and the functions and macros that shall be | |
107 | * called by the memoizer code to signal syntax errors. */ | |
108 | ||
109 | ||
110 | /* Syntax errors that can be detected during memoization: */ | |
111 | ||
112 | /* Circular or improper lists do not form valid scheme expressions. If a | |
113 | * circular list or an improper list is detected in a place where a scheme | |
114 | * expression is expected, a 'Bad expression' error is signalled. */ | |
115 | static const char s_bad_expression[] = "Bad expression"; | |
116 | ||
89bff2fc DH |
117 | /* If a form is detected that holds a different number of expressions than are |
118 | * required in that context, a 'Missing or extra expression' error is | |
119 | * signalled. */ | |
120 | static const char s_expression[] = "Missing or extra expression in"; | |
121 | ||
cc56ba80 | 122 | /* If a form is detected that holds less expressions than are required in that |
8ae95199 | 123 | * context, a 'Missing expression' error is signalled. */ |
cc56ba80 DH |
124 | static const char s_missing_expression[] = "Missing expression in"; |
125 | ||
609a8b86 | 126 | /* If a form is detected that holds more expressions than are allowed in that |
8ae95199 | 127 | * context, an 'Extra expression' error is signalled. */ |
609a8b86 DH |
128 | static const char s_extra_expression[] = "Extra expression in"; |
129 | ||
89bff2fc DH |
130 | /* The empty combination '()' is not allowed as an expression in scheme. If |
131 | * it is detected in a place where an expression is expected, an 'Illegal | |
132 | * empty combination' error is signalled. Note: If you encounter this error | |
133 | * message, it is very likely that you intended to denote the empty list. To | |
134 | * do so, you need to quote the empty list like (quote ()) or '(). */ | |
135 | static const char s_empty_combination[] = "Illegal empty combination"; | |
136 | ||
c86c440b DH |
137 | /* A body may hold an arbitrary number of internal defines, followed by a |
138 | * non-empty sequence of expressions. If a body with an empty sequence of | |
139 | * expressions is detected, a 'Missing body expression' error is signalled. | |
140 | */ | |
141 | static const char s_missing_body_expression[] = "Missing body expression in"; | |
142 | ||
143 | /* A body may hold an arbitrary number of internal defines, followed by a | |
144 | * non-empty sequence of expressions. Each the definitions and the | |
145 | * expressions may be grouped arbitraryly with begin, but it is not allowed to | |
146 | * mix definitions and expressions. If a define form in a body mixes | |
147 | * definitions and expressions, a 'Mixed definitions and expressions' error is | |
6bff1368 | 148 | * signalled. */ |
c86c440b | 149 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; |
6bff1368 DH |
150 | /* Definitions are only allowed on the top level and at the start of a body. |
151 | * If a definition is detected anywhere else, a 'Bad define placement' error | |
152 | * is signalled. */ | |
153 | static const char s_bad_define[] = "Bad define placement"; | |
c86c440b | 154 | |
2a6f7afe DH |
155 | /* Case or cond expressions must have at least one clause. If a case or cond |
156 | * expression without any clauses is detected, a 'Missing clauses' error is | |
157 | * signalled. */ | |
158 | static const char s_missing_clauses[] = "Missing clauses"; | |
159 | ||
609a8b86 DH |
160 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
161 | * last clause. If after the 'else' case clause further clauses are detected, | |
162 | * a 'Misplaced else clause' error is signalled. */ | |
163 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
164 | ||
2a6f7afe DH |
165 | /* If a case clause is detected that is not in the format |
166 | * (<label(s)> <expression1> <expression2> ...) | |
167 | * a 'Bad case clause' error is signalled. */ | |
168 | static const char s_bad_case_clause[] = "Bad case clause"; | |
169 | ||
2a6f7afe DH |
170 | /* If a case clause is detected where the <label(s)> element is neither a |
171 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
172 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
173 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
174 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
175 | * local or global environment, it is not considered a syntactic keyword, but | |
176 | * will be treated as any other variable. */ | |
177 | static const char s_bad_case_labels[] = "Bad case labels"; | |
178 | ||
179 | /* In a case statement all labels have to be distinct. If in a case statement | |
180 | * a label occurs more than once, a 'Duplicate case label' error is | |
181 | * signalled. */ | |
182 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
183 | ||
609a8b86 DH |
184 | /* If a cond clause is detected that is not in one of the formats |
185 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
186 | * a 'Bad cond clause' error is signalled. */ | |
187 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
188 | ||
189 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
190 | * not hold a recipient element for the test result, a 'Missing recipient' | |
191 | * error is signalled. */ | |
192 | static const char s_missing_recipient[] = "Missing recipient in"; | |
193 | ||
cc56ba80 DH |
194 | /* If in a position where a variable name is required some other object is |
195 | * detected, a 'Bad variable' error is signalled. */ | |
196 | static const char s_bad_variable[] = "Bad variable"; | |
197 | ||
a954ce1d DH |
198 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
199 | * possibly empty list. If any other object is detected in a place where a | |
200 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
201 | static const char s_bad_bindings[] = "Bad bindings"; | |
202 | ||
203 | /* Depending on the syntactic context, a binding has to be in the format | |
204 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
205 | * If anything else is detected in a place where a binding was expected, a | |
206 | * 'Bad binding' error is signalled. */ | |
207 | static const char s_bad_binding[] = "Bad binding"; | |
208 | ||
4610b011 DH |
209 | /* Some syntactic forms don't allow variable names to appear more than once in |
210 | * a list of bindings. If such a situation is nevertheless detected, a | |
211 | * 'Duplicate binding' error is signalled. */ | |
212 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
213 | ||
a954ce1d DH |
214 | /* If the exit form of a 'do' expression is not in the format |
215 | * (<test> <expression> ...) | |
216 | * a 'Bad exit clause' error is signalled. */ | |
217 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
218 | ||
03a3e941 DH |
219 | /* The formal function arguments of a lambda expression have to be either a |
220 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
221 | * error is signalled. */ | |
222 | static const char s_bad_formals[] = "Bad formals"; | |
223 | ||
224 | /* If in a lambda expression something else than a symbol is detected at a | |
225 | * place where a formal function argument is required, a 'Bad formal' error is | |
226 | * signalled. */ | |
227 | static const char s_bad_formal[] = "Bad formal"; | |
228 | ||
229 | /* If in the arguments list of a lambda expression an argument name occurs | |
230 | * more than once, a 'Duplicate formal' error is signalled. */ | |
231 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
232 | ||
6f81708a DH |
233 | /* If the evaluation of an unquote-splicing expression gives something else |
234 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
235 | * signalled. */ | |
236 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
237 | ||
9a848baf DH |
238 | /* If something else than an exact integer is detected as the argument for |
239 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
240 | static const char s_bad_slot_number[] = "Bad slot number"; | |
241 | ||
e6729603 DH |
242 | |
243 | /* Signal a syntax error. We distinguish between the form that caused the | |
244 | * error and the enclosing expression. The error message will print out as | |
245 | * shown in the following pattern. The file name and line number are only | |
246 | * given when they can be determined from the erroneous form or from the | |
247 | * enclosing expression. | |
248 | * | |
249 | * <filename>: In procedure memoization: | |
250 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
251 | ||
252 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
253 | ||
254 | /* The prototype is needed to indicate that the function does not return. */ | |
255 | static void | |
256 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
257 | ||
258 | static void | |
259 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
260 | { | |
cc95e00a | 261 | SCM msg_string = scm_from_locale_string (msg); |
e6729603 DH |
262 | SCM filename = SCM_BOOL_F; |
263 | SCM linenr = SCM_BOOL_F; | |
264 | const char *format; | |
265 | SCM args; | |
266 | ||
a61f4e0c | 267 | if (scm_is_pair (form)) |
e6729603 DH |
268 | { |
269 | filename = scm_source_property (form, scm_sym_filename); | |
270 | linenr = scm_source_property (form, scm_sym_line); | |
271 | } | |
272 | ||
a61f4e0c | 273 | if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr)) |
e6729603 DH |
274 | { |
275 | filename = scm_source_property (expr, scm_sym_filename); | |
276 | linenr = scm_source_property (expr, scm_sym_line); | |
277 | } | |
278 | ||
279 | if (!SCM_UNBNDP (expr)) | |
280 | { | |
7888309b | 281 | if (scm_is_true (filename)) |
e6729603 DH |
282 | { |
283 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
284 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
285 | } | |
7888309b | 286 | else if (scm_is_true (linenr)) |
e6729603 DH |
287 | { |
288 | format = "In line ~S: ~A ~S in expression ~S."; | |
289 | args = scm_list_4 (linenr, msg_string, form, expr); | |
290 | } | |
291 | else | |
292 | { | |
293 | format = "~A ~S in expression ~S."; | |
294 | args = scm_list_3 (msg_string, form, expr); | |
295 | } | |
296 | } | |
297 | else | |
298 | { | |
7888309b | 299 | if (scm_is_true (filename)) |
e6729603 DH |
300 | { |
301 | format = "In file ~S, line ~S: ~A ~S."; | |
302 | args = scm_list_4 (filename, linenr, msg_string, form); | |
303 | } | |
7888309b | 304 | else if (scm_is_true (linenr)) |
e6729603 DH |
305 | { |
306 | format = "In line ~S: ~A ~S."; | |
307 | args = scm_list_3 (linenr, msg_string, form); | |
308 | } | |
309 | else | |
310 | { | |
311 | format = "~A ~S."; | |
312 | args = scm_list_2 (msg_string, form); | |
313 | } | |
314 | } | |
315 | ||
316 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
317 | } | |
318 | ||
319 | ||
320 | /* Shortcut macros to simplify syntax error handling. */ | |
321 | #define ASSERT_SYNTAX(cond, message, form) \ | |
322 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
323 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
324 | { if (!(cond)) syntax_error (message, form, expr); } | |
325 | ||
326 | \f | |
327 | ||
d0624e39 DH |
328 | /* {Ilocs} |
329 | * | |
330 | * Ilocs are memoized references to variables in local environment frames. | |
331 | * They are represented as three values: The relative offset of the | |
332 | * environment frame, the number of the binding within that frame, and a | |
333 | * boolean value indicating whether the binding is the last binding in the | |
334 | * frame. | |
a55c2b68 MV |
335 | * |
336 | * Frame numbers have 11 bits, relative offsets have 12 bits. | |
d0624e39 | 337 | */ |
7e6e6b37 | 338 | |
d0624e39 | 339 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) |
7e6e6b37 DH |
340 | #define SCM_IFRINC (0x00000100L) |
341 | #define SCM_ICDR (0x00080000L) | |
d0624e39 | 342 | #define SCM_IDINC (0x00100000L) |
7e6e6b37 DH |
343 | #define SCM_IFRAME(n) ((long)((SCM_ICDR-SCM_IFRINC)>>8) \ |
344 | & (SCM_UNPACK (n) >> 8)) | |
345 | #define SCM_IDIST(n) (SCM_UNPACK (n) >> 20) | |
346 | #define SCM_ICDRP(n) (SCM_ICDR & SCM_UNPACK (n)) | |
d0624e39 | 347 | #define SCM_IDSTMSK (-SCM_IDINC) |
a55c2b68 MV |
348 | #define SCM_IFRAMEMAX ((1<<11)-1) |
349 | #define SCM_IDISTMAX ((1<<12)-1) | |
d0624e39 DH |
350 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ |
351 | SCM_PACK ( \ | |
352 | ((frame_nr) << 8) \ | |
353 | + ((binding_nr) << 20) \ | |
354 | + ((last_p) ? SCM_ICDR : 0) \ | |
355 | + scm_tc8_iloc ) | |
356 | ||
7e6e6b37 DH |
357 | void |
358 | scm_i_print_iloc (SCM iloc, SCM port) | |
359 | { | |
360 | scm_puts ("#@", port); | |
361 | scm_intprint ((long) SCM_IFRAME (iloc), 10, port); | |
362 | scm_putc (SCM_ICDRP (iloc) ? '-' : '+', port); | |
363 | scm_intprint ((long) SCM_IDIST (iloc), 10, port); | |
364 | } | |
365 | ||
d0624e39 DH |
366 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) |
367 | ||
368 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
90df793f | 369 | |
d0624e39 DH |
370 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, |
371 | (SCM frame, SCM binding, SCM cdrp), | |
372 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
373 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
374 | #define FUNC_NAME s_scm_dbg_make_iloc | |
375 | { | |
c3c97a34 KR |
376 | return SCM_MAKE_ILOC ((scm_t_bits) scm_to_unsigned_integer (frame, 0, SCM_IFRAMEMAX), |
377 | (scm_t_bits) scm_to_unsigned_integer (binding, 0, SCM_IDISTMAX), | |
7888309b | 378 | scm_is_true (cdrp)); |
d0624e39 DH |
379 | } |
380 | #undef FUNC_NAME | |
381 | ||
382 | SCM scm_dbg_iloc_p (SCM obj); | |
90df793f | 383 | |
d0624e39 DH |
384 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, |
385 | (SCM obj), | |
386 | "Return @code{#t} if @var{obj} is an iloc.") | |
387 | #define FUNC_NAME s_scm_dbg_iloc_p | |
388 | { | |
7888309b | 389 | return scm_from_bool (SCM_ILOCP (obj)); |
d0624e39 DH |
390 | } |
391 | #undef FUNC_NAME | |
392 | ||
393 | #endif | |
394 | ||
395 | \f | |
396 | ||
7e6e6b37 DH |
397 | /* {Evaluator byte codes (isyms)} |
398 | */ | |
399 | ||
400 | #define ISYMNUM(n) (SCM_ITAG8_DATA (n)) | |
401 | ||
402 | /* This table must agree with the list of SCM_IM_ constants in tags.h */ | |
403 | static const char *const isymnames[] = | |
404 | { | |
405 | "#@and", | |
406 | "#@begin", | |
407 | "#@case", | |
408 | "#@cond", | |
409 | "#@do", | |
410 | "#@if", | |
411 | "#@lambda", | |
412 | "#@let", | |
413 | "#@let*", | |
414 | "#@letrec", | |
415 | "#@or", | |
416 | "#@quote", | |
417 | "#@set!", | |
418 | "#@define", | |
419 | "#@apply", | |
420 | "#@call-with-current-continuation", | |
421 | "#@dispatch", | |
422 | "#@slot-ref", | |
423 | "#@slot-set!", | |
424 | "#@delay", | |
425 | "#@future", | |
426 | "#@call-with-values", | |
427 | "#@else", | |
428 | "#@arrow", | |
429 | "#@nil-cond", | |
430 | "#@bind" | |
431 | }; | |
432 | ||
433 | void | |
434 | scm_i_print_isym (SCM isym, SCM port) | |
435 | { | |
436 | const size_t isymnum = ISYMNUM (isym); | |
437 | if (isymnum < (sizeof isymnames / sizeof (char *))) | |
438 | scm_puts (isymnames[isymnum], port); | |
439 | else | |
440 | scm_ipruk ("isym", isym, port); | |
441 | } | |
442 | ||
443 | \f | |
444 | ||
e5156567 DH |
445 | /* The function lookup_symbol is used during memoization: Lookup the symbol in |
446 | * the environment. If there is no binding for the symbol, SCM_UNDEFINED is | |
57d23e25 DH |
447 | * returned. If the symbol is a global variable, the variable object to which |
448 | * the symbol is bound is returned. Finally, if the symbol is a local | |
449 | * variable the corresponding iloc object is returned. */ | |
6f81708a DH |
450 | |
451 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
452 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
57d23e25 DH |
453 | * is unbound and it returns a variable object if the symbol is a global |
454 | * variable. */ | |
6f81708a DH |
455 | static SCM |
456 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
457 | { | |
458 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
7888309b | 459 | if (scm_is_false (variable)) |
57d23e25 | 460 | return SCM_UNDEFINED; |
6f81708a | 461 | else |
57d23e25 | 462 | return variable; |
6f81708a DH |
463 | } |
464 | ||
465 | static SCM | |
466 | lookup_symbol (const SCM symbol, const SCM env) | |
467 | { | |
468 | SCM frame_idx; | |
469 | unsigned int frame_nr; | |
470 | ||
471 | for (frame_idx = env, frame_nr = 0; | |
a61f4e0c | 472 | !scm_is_null (frame_idx); |
6f81708a DH |
473 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) |
474 | { | |
475 | const SCM frame = SCM_CAR (frame_idx); | |
a61f4e0c | 476 | if (scm_is_pair (frame)) |
6f81708a DH |
477 | { |
478 | /* frame holds a local environment frame */ | |
479 | SCM symbol_idx; | |
480 | unsigned int symbol_nr; | |
481 | ||
482 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
a61f4e0c | 483 | scm_is_pair (symbol_idx); |
6f81708a DH |
484 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) |
485 | { | |
bc36d050 | 486 | if (scm_is_eq (SCM_CAR (symbol_idx), symbol)) |
6f81708a DH |
487 | /* found the symbol, therefore return the iloc */ |
488 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
489 | } | |
bc36d050 | 490 | if (scm_is_eq (symbol_idx, symbol)) |
6f81708a DH |
491 | /* found the symbol as the last element of the current frame */ |
492 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
493 | } | |
494 | else | |
495 | { | |
496 | /* no more local environment frames */ | |
497 | return lookup_global_symbol (symbol, frame); | |
498 | } | |
499 | } | |
500 | ||
501 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
502 | } | |
503 | ||
504 | ||
505 | /* Return true if the symbol is - from the point of view of a macro | |
506 | * transformer - a literal in the sense specified in chapter "pattern | |
507 | * language" of R5RS. In the code below, however, we don't match the | |
508 | * definition of R5RS exactly: It returns true if the identifier has no | |
509 | * binding or if it is a syntactic keyword. */ | |
510 | static int | |
511 | literal_p (const SCM symbol, const SCM env) | |
512 | { | |
57d23e25 DH |
513 | const SCM variable = lookup_symbol (symbol, env); |
514 | if (SCM_UNBNDP (variable)) | |
515 | return 1; | |
516 | if (SCM_VARIABLEP (variable) && SCM_MACROP (SCM_VARIABLE_REF (variable))) | |
6f81708a DH |
517 | return 1; |
518 | else | |
519 | return 0; | |
520 | } | |
17fa3fcf | 521 | |
5fb64383 DH |
522 | |
523 | /* Return true if the expression is self-quoting in the memoized code. Thus, | |
524 | * some other objects (like e. g. vectors) are reported as self-quoting, which | |
525 | * according to R5RS would need to be quoted. */ | |
526 | static int | |
527 | is_self_quoting_p (const SCM expr) | |
528 | { | |
a61f4e0c | 529 | if (scm_is_pair (expr)) |
5fb64383 | 530 | return 0; |
cc95e00a | 531 | else if (scm_is_symbol (expr)) |
5fb64383 | 532 | return 0; |
a61f4e0c | 533 | else if (scm_is_null (expr)) |
5fb64383 DH |
534 | return 0; |
535 | else return 1; | |
536 | } | |
537 | ||
0f2d19dd | 538 | |
212e58ed DH |
539 | SCM_SYMBOL (sym_three_question_marks, "???"); |
540 | ||
541 | static SCM | |
542 | unmemoize_expression (const SCM expr, const SCM env) | |
543 | { | |
544 | if (SCM_ILOCP (expr)) | |
545 | { | |
546 | SCM frame_idx; | |
547 | unsigned long int frame_nr; | |
548 | SCM symbol_idx; | |
549 | unsigned long int symbol_nr; | |
550 | ||
551 | for (frame_idx = env, frame_nr = SCM_IFRAME (expr); | |
552 | frame_nr != 0; | |
553 | frame_idx = SCM_CDR (frame_idx), --frame_nr) | |
554 | ; | |
555 | for (symbol_idx = SCM_CAAR (frame_idx), symbol_nr = SCM_IDIST (expr); | |
556 | symbol_nr != 0; | |
557 | symbol_idx = SCM_CDR (symbol_idx), --symbol_nr) | |
558 | ; | |
559 | return SCM_ICDRP (expr) ? symbol_idx : SCM_CAR (symbol_idx); | |
560 | } | |
561 | else if (SCM_VARIABLEP (expr)) | |
562 | { | |
563 | const SCM sym = scm_module_reverse_lookup (scm_env_module (env), expr); | |
7888309b | 564 | return scm_is_true (sym) ? sym : sym_three_question_marks; |
212e58ed | 565 | } |
4057a3e0 | 566 | else if (scm_is_simple_vector (expr)) |
212e58ed DH |
567 | { |
568 | return scm_list_2 (scm_sym_quote, expr); | |
569 | } | |
a61f4e0c | 570 | else if (!scm_is_pair (expr)) |
212e58ed DH |
571 | { |
572 | return expr; | |
573 | } | |
574 | else if (SCM_ISYMP (SCM_CAR (expr))) | |
575 | { | |
576 | return unmemoize_builtin_macro (expr, env); | |
577 | } | |
578 | else | |
579 | { | |
580 | return unmemoize_exprs (expr, env); | |
581 | } | |
582 | } | |
583 | ||
584 | ||
585 | static SCM | |
586 | unmemoize_exprs (const SCM exprs, const SCM env) | |
587 | { | |
90df793f | 588 | SCM r_result = SCM_EOL; |
9fcf3cbb | 589 | SCM expr_idx = exprs; |
90df793f DH |
590 | SCM um_expr; |
591 | ||
592 | /* Note that due to the current lazy memoizer we may find partially memoized | |
5fa0939c | 593 | * code during execution. In such code we have to expect improper lists of |
90df793f DH |
594 | * expressions: On the one hand, for such code syntax checks have not yet |
595 | * fully been performed, on the other hand, there may be even legal code | |
596 | * like '(a . b) appear as an improper list of expressions as long as the | |
597 | * quote expression is still in its unmemoized form. For this reason, the | |
598 | * following code handles improper lists of expressions until memoization | |
599 | * and execution have been completely separated. */ | |
a61f4e0c | 600 | for (; scm_is_pair (expr_idx); expr_idx = SCM_CDR (expr_idx)) |
212e58ed DH |
601 | { |
602 | const SCM expr = SCM_CAR (expr_idx); | |
5fa0939c DH |
603 | |
604 | /* In partially memoized code, lists of expressions that stem from a | |
605 | * body form may start with an ISYM if the body itself has not yet been | |
606 | * memoized. This isym is just an internal marker to indicate that the | |
607 | * body still needs to be memoized. An isym may occur at the very | |
608 | * beginning of the body or after one or more comment strings. It is | |
609 | * dropped during unmemoization. */ | |
610 | if (!SCM_ISYMP (expr)) | |
611 | { | |
612 | um_expr = unmemoize_expression (expr, env); | |
613 | r_result = scm_cons (um_expr, r_result); | |
614 | } | |
90df793f DH |
615 | } |
616 | um_expr = unmemoize_expression (expr_idx, env); | |
a61f4e0c | 617 | if (!scm_is_null (r_result)) |
90df793f DH |
618 | { |
619 | const SCM result = scm_reverse_x (r_result, SCM_UNDEFINED); | |
620 | SCM_SETCDR (r_result, um_expr); | |
621 | return result; | |
622 | } | |
623 | else | |
624 | { | |
625 | return um_expr; | |
212e58ed | 626 | } |
212e58ed DH |
627 | } |
628 | ||
629 | ||
34adf7ea DH |
630 | /* Rewrite the body (which is given as the list of expressions forming the |
631 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
632 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
633 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
634 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 635 | * SCM_IM_LET, etc. |
34adf7ea DH |
636 | * |
637 | * It is assumed that the calling expression has already made sure that the | |
638 | * body is a proper list. */ | |
26d5b9b4 | 639 | static SCM |
430b8401 | 640 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 641 | { |
26d5b9b4 | 642 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
643 | if (SCM_ISYMP (SCM_CAR (exprs))) |
644 | return exprs; | |
645 | else | |
646 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
647 | } |
648 | ||
1cc91f1b | 649 | |
57d23e25 DH |
650 | /* The function m_expand_body memoizes a proper list of expressions forming a |
651 | * body. This function takes care of dealing with internal defines and | |
652 | * transforming them into an equivalent letrec expression. The list of | |
653 | * expressions is rewritten in place. */ | |
910b5125 | 654 | |
57d23e25 DH |
655 | /* This is a helper function for m_expand_body. If the argument expression is |
656 | * a symbol that denotes a syntactic keyword, the corresponding macro object | |
657 | * is returned, in all other cases the function returns SCM_UNDEFINED. */ | |
910b5125 DH |
658 | static SCM |
659 | try_macro_lookup (const SCM expr, const SCM env) | |
660 | { | |
cc95e00a | 661 | if (scm_is_symbol (expr)) |
910b5125 | 662 | { |
57d23e25 DH |
663 | const SCM variable = lookup_symbol (expr, env); |
664 | if (SCM_VARIABLEP (variable)) | |
665 | { | |
666 | const SCM value = SCM_VARIABLE_REF (variable); | |
667 | if (SCM_MACROP (value)) | |
668 | return value; | |
669 | } | |
910b5125 | 670 | } |
57d23e25 DH |
671 | |
672 | return SCM_UNDEFINED; | |
910b5125 DH |
673 | } |
674 | ||
675 | /* This is a helper function for m_expand_body. It expands user macros, | |
676 | * because for the correct translation of a body we need to know whether they | |
677 | * expand to a definition. */ | |
678 | static SCM | |
679 | expand_user_macros (SCM expr, const SCM env) | |
680 | { | |
a61f4e0c | 681 | while (scm_is_pair (expr)) |
910b5125 DH |
682 | { |
683 | const SCM car_expr = SCM_CAR (expr); | |
684 | const SCM new_car = expand_user_macros (car_expr, env); | |
685 | const SCM value = try_macro_lookup (new_car, env); | |
686 | ||
687 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
688 | { | |
689 | /* User macros transform code into code. */ | |
690 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
691 | /* We need to reiterate on the transformed code. */ | |
692 | } | |
693 | else | |
694 | { | |
695 | /* No user macro: return. */ | |
696 | SCM_SETCAR (expr, new_car); | |
697 | return expr; | |
698 | } | |
699 | } | |
700 | ||
701 | return expr; | |
702 | } | |
703 | ||
704 | /* This is a helper function for m_expand_body. It determines if a given form | |
705 | * represents an application of a given built-in macro. The built-in macro to | |
706 | * check for is identified by its syntactic keyword. The form is an | |
707 | * application of the given macro if looking up the car of the form in the | |
708 | * given environment actually returns the built-in macro. */ | |
709 | static int | |
710 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
711 | { | |
a61f4e0c | 712 | if (scm_is_pair (form)) |
910b5125 DH |
713 | { |
714 | const SCM car_form = SCM_CAR (form); | |
715 | const SCM value = try_macro_lookup (car_form, env); | |
716 | if (SCM_BUILTIN_MACRO_P (value)) | |
717 | { | |
718 | const SCM macro_name = scm_macro_name (value); | |
bc36d050 | 719 | return scm_is_eq (macro_name, syntactic_keyword); |
910b5125 DH |
720 | } |
721 | } | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
9d4bf6d3 | 726 | static void |
910b5125 DH |
727 | m_expand_body (const SCM forms, const SCM env) |
728 | { | |
729 | /* The first body form can be skipped since it is known to be the ISYM that | |
730 | * was prepended to the body by m_body. */ | |
731 | SCM cdr_forms = SCM_CDR (forms); | |
732 | SCM form_idx = cdr_forms; | |
733 | SCM definitions = SCM_EOL; | |
734 | SCM sequence = SCM_EOL; | |
735 | ||
736 | /* According to R5RS, the list of body forms consists of two parts: a number | |
737 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
738 | * expressions. Each the definitions and the expressions may be grouped | |
739 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
740 | * expressions. The task of the following loop therefore is to split the | |
741 | * list of body forms into the list of definitions and the sequence of | |
742 | * expressions. */ | |
a61f4e0c | 743 | while (!scm_is_null (form_idx)) |
910b5125 DH |
744 | { |
745 | const SCM form = SCM_CAR (form_idx); | |
746 | const SCM new_form = expand_user_macros (form, env); | |
747 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
748 | { | |
749 | definitions = scm_cons (new_form, definitions); | |
750 | form_idx = SCM_CDR (form_idx); | |
751 | } | |
752 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
753 | { | |
754 | /* We have encountered a group of forms. This has to be either a | |
755 | * (possibly empty) group of (possibly further grouped) definitions, | |
756 | * or a non-empty group of (possibly further grouped) | |
757 | * expressions. */ | |
758 | const SCM grouped_forms = SCM_CDR (new_form); | |
759 | unsigned int found_definition = 0; | |
760 | unsigned int found_expression = 0; | |
761 | SCM grouped_form_idx = grouped_forms; | |
a61f4e0c | 762 | while (!found_expression && !scm_is_null (grouped_form_idx)) |
910b5125 DH |
763 | { |
764 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
765 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
766 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
767 | { | |
768 | found_definition = 1; | |
769 | definitions = scm_cons (new_inner_form, definitions); | |
770 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
771 | } | |
772 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
773 | { | |
774 | const SCM inner_group = SCM_CDR (new_inner_form); | |
775 | grouped_form_idx | |
776 | = scm_append (scm_list_2 (inner_group, | |
777 | SCM_CDR (grouped_form_idx))); | |
778 | } | |
779 | else | |
780 | { | |
781 | /* The group marks the start of the expressions of the body. | |
782 | * We have to make sure that within the same group we have | |
783 | * not encountered a definition before. */ | |
784 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
785 | found_expression = 1; | |
786 | grouped_form_idx = SCM_EOL; | |
787 | } | |
788 | } | |
789 | ||
790 | /* We have finished processing the group. If we have not yet | |
791 | * encountered an expression we continue processing the forms of the | |
792 | * body to collect further definition forms. Otherwise, the group | |
793 | * marks the start of the sequence of expressions of the body. */ | |
794 | if (!found_expression) | |
795 | { | |
796 | form_idx = SCM_CDR (form_idx); | |
797 | } | |
798 | else | |
799 | { | |
800 | sequence = form_idx; | |
801 | form_idx = SCM_EOL; | |
802 | } | |
803 | } | |
804 | else | |
805 | { | |
806 | /* We have detected a form which is no definition. This marks the | |
807 | * start of the sequence of expressions of the body. */ | |
808 | sequence = form_idx; | |
809 | form_idx = SCM_EOL; | |
810 | } | |
811 | } | |
812 | ||
813 | /* FIXME: forms does not hold information about the file location. */ | |
a61f4e0c | 814 | ASSERT_SYNTAX (scm_is_pair (sequence), s_missing_body_expression, cdr_forms); |
910b5125 | 815 | |
a61f4e0c | 816 | if (!scm_is_null (definitions)) |
910b5125 DH |
817 | { |
818 | SCM definition_idx; | |
819 | SCM letrec_tail; | |
820 | SCM letrec_expression; | |
821 | SCM new_letrec_expression; | |
910b5125 DH |
822 | |
823 | SCM bindings = SCM_EOL; | |
824 | for (definition_idx = definitions; | |
a61f4e0c | 825 | !scm_is_null (definition_idx); |
910b5125 DH |
826 | definition_idx = SCM_CDR (definition_idx)) |
827 | { | |
828 | const SCM definition = SCM_CAR (definition_idx); | |
829 | const SCM canonical_definition = canonicalize_define (definition); | |
830 | const SCM binding = SCM_CDR (canonical_definition); | |
831 | bindings = scm_cons (binding, bindings); | |
832 | }; | |
833 | ||
834 | letrec_tail = scm_cons (bindings, sequence); | |
835 | /* FIXME: forms does not hold information about the file location. */ | |
836 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
837 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
838 | SCM_SETCAR (forms, new_letrec_expression); |
839 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
840 | } |
841 | else | |
842 | { | |
843 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
844 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
845 | } |
846 | } | |
847 | ||
2b189e65 MV |
848 | static SCM |
849 | macroexp (SCM x, SCM env) | |
850 | { | |
851 | SCM res, proc, orig_sym; | |
852 | ||
853 | /* Don't bother to produce error messages here. We get them when we | |
854 | eventually execute the code for real. */ | |
855 | ||
856 | macro_tail: | |
857 | orig_sym = SCM_CAR (x); | |
cc95e00a | 858 | if (!scm_is_symbol (orig_sym)) |
2b189e65 MV |
859 | return x; |
860 | ||
861 | { | |
862 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
863 | if (proc_ptr == NULL) | |
864 | { | |
865 | /* We have lost the race. */ | |
866 | goto macro_tail; | |
867 | } | |
868 | proc = *proc_ptr; | |
869 | } | |
870 | ||
871 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
872 | special forms and should not be evaluated here. */ | |
873 | ||
874 | if (!SCM_MACROP (proc) | |
875 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
876 | return x; | |
877 | ||
878 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ | |
879 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); | |
880 | ||
881 | if (scm_ilength (res) <= 0) | |
882 | res = scm_list_2 (SCM_IM_BEGIN, res); | |
2b0fb0a5 NJ |
883 | |
884 | /* njrev: Several queries here: (1) I don't see how it can be | |
885 | correct that the SCM_SETCAR 2 lines below this comment needs | |
886 | protection, but the SCM_SETCAR 6 lines above does not, so | |
887 | something here is probably wrong. (2) macroexp() is now only | |
888 | used in one place - scm_m_generalized_set_x - whereas all other | |
889 | macro expansion happens through expand_user_macros. Therefore | |
890 | (2.1) perhaps macroexp() could be eliminated completely now? | |
891 | (2.2) Does expand_user_macros need any critical section | |
892 | protection? */ | |
893 | ||
9de87eea | 894 | SCM_CRITICAL_SECTION_START; |
2b189e65 MV |
895 | SCM_SETCAR (x, SCM_CAR (res)); |
896 | SCM_SETCDR (x, SCM_CDR (res)); | |
9de87eea | 897 | SCM_CRITICAL_SECTION_END; |
2b189e65 MV |
898 | |
899 | goto macro_tail; | |
900 | } | |
910b5125 | 901 | |
9fbee57e | 902 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
903 | |
904 | ||
3b88ed2a | 905 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 906 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 907 | |
8ea46249 | 908 | SCM |
e6729603 | 909 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 910 | { |
e6729603 DH |
911 | const SCM cdr_expr = SCM_CDR (expr); |
912 | const long length = scm_ilength (cdr_expr); | |
913 | ||
914 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
915 | ||
916 | if (length == 0) | |
917 | { | |
918 | /* Special case: (and) is replaced by #t. */ | |
919 | return SCM_BOOL_T; | |
920 | } | |
0f2d19dd | 921 | else |
e6729603 DH |
922 | { |
923 | SCM_SETCAR (expr, SCM_IM_AND); | |
924 | return expr; | |
925 | } | |
0f2d19dd JB |
926 | } |
927 | ||
212e58ed DH |
928 | static SCM |
929 | unmemoize_and (const SCM expr, const SCM env) | |
930 | { | |
931 | return scm_cons (scm_sym_and, unmemoize_exprs (SCM_CDR (expr), env)); | |
932 | } | |
933 | ||
1cc91f1b | 934 | |
3b88ed2a | 935 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 936 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
937 | |
938 | SCM | |
2a6f7afe | 939 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 940 | { |
2a6f7afe | 941 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
942 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
943 | * That means, there should be a distinction between uses of begin where an | |
944 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
945 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
946 | ||
947 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
948 | return expr; | |
0f2d19dd JB |
949 | } |
950 | ||
212e58ed DH |
951 | static SCM |
952 | unmemoize_begin (const SCM expr, const SCM env) | |
953 | { | |
954 | return scm_cons (scm_sym_begin, unmemoize_exprs (SCM_CDR (expr), env)); | |
955 | } | |
956 | ||
0f2d19dd | 957 | |
3b88ed2a | 958 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 959 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 960 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 961 | |
8ea46249 | 962 | SCM |
2a6f7afe | 963 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 964 | { |
8ea46249 | 965 | SCM clauses; |
2a6f7afe DH |
966 | SCM all_labels = SCM_EOL; |
967 | ||
968 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
969 | const int else_literal_p = literal_p (scm_sym_else, env); | |
970 | ||
971 | const SCM cdr_expr = SCM_CDR (expr); | |
972 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
973 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
974 | ||
975 | clauses = SCM_CDR (cdr_expr); | |
a61f4e0c | 976 | while (!scm_is_null (clauses)) |
0f2d19dd | 977 | { |
2a6f7afe DH |
978 | SCM labels; |
979 | ||
980 | const SCM clause = SCM_CAR (clauses); | |
981 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
982 | s_bad_case_clause, clause, expr); | |
983 | ||
984 | labels = SCM_CAR (clause); | |
a61f4e0c | 985 | if (scm_is_pair (labels)) |
2a6f7afe DH |
986 | { |
987 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
988 | s_bad_case_labels, labels, expr); | |
26ecfa39 | 989 | all_labels = scm_append (scm_list_2 (labels, all_labels)); |
2a6f7afe | 990 | } |
a61f4e0c | 991 | else if (scm_is_null (labels)) |
58a2510b DH |
992 | { |
993 | /* The list of labels is empty. According to R5RS this is allowed. | |
994 | * It means that the sequence of expressions will never be executed. | |
995 | * Therefore, as an optimization, we could remove the whole | |
996 | * clause. */ | |
997 | } | |
2a6f7afe DH |
998 | else |
999 | { | |
bc36d050 | 1000 | ASSERT_SYNTAX_2 (scm_is_eq (labels, scm_sym_else) && else_literal_p, |
2a6f7afe | 1001 | s_bad_case_labels, labels, expr); |
a61f4e0c | 1002 | ASSERT_SYNTAX_2 (scm_is_null (SCM_CDR (clauses)), |
609a8b86 | 1003 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
1004 | } |
1005 | ||
1006 | /* build the new clause */ | |
bc36d050 | 1007 | if (scm_is_eq (labels, scm_sym_else)) |
2a6f7afe DH |
1008 | SCM_SETCAR (clause, SCM_IM_ELSE); |
1009 | ||
8ea46249 | 1010 | clauses = SCM_CDR (clauses); |
0f2d19dd | 1011 | } |
2a6f7afe DH |
1012 | |
1013 | /* Check whether all case labels are distinct. */ | |
a61f4e0c | 1014 | for (; !scm_is_null (all_labels); all_labels = SCM_CDR (all_labels)) |
2a6f7afe DH |
1015 | { |
1016 | const SCM label = SCM_CAR (all_labels); | |
7888309b | 1017 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (label, SCM_CDR (all_labels))), |
4610b011 | 1018 | s_duplicate_case_label, label, expr); |
2a6f7afe DH |
1019 | } |
1020 | ||
1021 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1022 | return expr; | |
0f2d19dd JB |
1023 | } |
1024 | ||
212e58ed DH |
1025 | static SCM |
1026 | unmemoize_case (const SCM expr, const SCM env) | |
1027 | { | |
1028 | const SCM um_key_expr = unmemoize_expression (SCM_CADR (expr), env); | |
1029 | SCM um_clauses = SCM_EOL; | |
1030 | SCM clause_idx; | |
1031 | ||
1032 | for (clause_idx = SCM_CDDR (expr); | |
a61f4e0c | 1033 | !scm_is_null (clause_idx); |
212e58ed DH |
1034 | clause_idx = SCM_CDR (clause_idx)) |
1035 | { | |
1036 | const SCM clause = SCM_CAR (clause_idx); | |
1037 | const SCM labels = SCM_CAR (clause); | |
1038 | const SCM exprs = SCM_CDR (clause); | |
1039 | ||
1040 | const SCM um_exprs = unmemoize_exprs (exprs, env); | |
bc36d050 | 1041 | const SCM um_labels = (scm_is_eq (labels, SCM_IM_ELSE)) |
212e58ed DH |
1042 | ? scm_sym_else |
1043 | : scm_i_finite_list_copy (labels); | |
1044 | const SCM um_clause = scm_cons (um_labels, um_exprs); | |
1045 | ||
1046 | um_clauses = scm_cons (um_clause, um_clauses); | |
1047 | } | |
1048 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1049 | ||
1050 | return scm_cons2 (scm_sym_case, um_key_expr, um_clauses); | |
1051 | } | |
1052 | ||
0f2d19dd | 1053 | |
3b88ed2a | 1054 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1055 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1056 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1057 | |
8ea46249 | 1058 | SCM |
609a8b86 | 1059 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1060 | { |
609a8b86 DH |
1061 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1062 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1063 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1064 | ||
1065 | const SCM clauses = SCM_CDR (expr); | |
1066 | SCM clause_idx; | |
1067 | ||
1068 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1069 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1070 | ||
1071 | for (clause_idx = clauses; | |
a61f4e0c | 1072 | !scm_is_null (clause_idx); |
609a8b86 | 1073 | clause_idx = SCM_CDR (clause_idx)) |
0f2d19dd | 1074 | { |
609a8b86 DH |
1075 | SCM test; |
1076 | ||
1077 | const SCM clause = SCM_CAR (clause_idx); | |
1078 | const long length = scm_ilength (clause); | |
1079 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1080 | ||
1081 | test = SCM_CAR (clause); | |
bc36d050 | 1082 | if (scm_is_eq (test, scm_sym_else) && else_literal_p) |
0f2d19dd | 1083 | { |
a61f4e0c | 1084 | const int last_clause_p = scm_is_null (SCM_CDR (clause_idx)); |
609a8b86 DH |
1085 | ASSERT_SYNTAX_2 (length >= 2, |
1086 | s_bad_cond_clause, clause, expr); | |
1087 | ASSERT_SYNTAX_2 (last_clause_p, | |
1088 | s_misplaced_else_clause, clause, expr); | |
1089 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1090 | } |
609a8b86 | 1091 | else if (length >= 2 |
bc36d050 | 1092 | && scm_is_eq (SCM_CADR (clause), scm_sym_arrow) |
609a8b86 DH |
1093 | && arrow_literal_p) |
1094 | { | |
1095 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1096 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1097 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1098 | } |
1fe1fc0a MV |
1099 | /* SRFI 61 extended cond */ |
1100 | else if (length >= 3 | |
1101 | && scm_is_eq (SCM_CADDR (clause), scm_sym_arrow) | |
1102 | && arrow_literal_p) | |
1103 | { | |
1104 | ASSERT_SYNTAX_2 (length > 3, s_missing_recipient, clause, expr); | |
1105 | ASSERT_SYNTAX_2 (length == 4, s_extra_expression, clause, expr); | |
1106 | SCM_SETCAR (SCM_CDDR (clause), SCM_IM_ARROW); | |
1107 | } | |
0f2d19dd | 1108 | } |
609a8b86 DH |
1109 | |
1110 | SCM_SETCAR (expr, SCM_IM_COND); | |
1111 | return expr; | |
0f2d19dd JB |
1112 | } |
1113 | ||
212e58ed DH |
1114 | static SCM |
1115 | unmemoize_cond (const SCM expr, const SCM env) | |
1116 | { | |
1117 | SCM um_clauses = SCM_EOL; | |
1118 | SCM clause_idx; | |
1119 | ||
1120 | for (clause_idx = SCM_CDR (expr); | |
a61f4e0c | 1121 | !scm_is_null (clause_idx); |
212e58ed DH |
1122 | clause_idx = SCM_CDR (clause_idx)) |
1123 | { | |
1124 | const SCM clause = SCM_CAR (clause_idx); | |
1125 | const SCM sequence = SCM_CDR (clause); | |
1126 | const SCM test = SCM_CAR (clause); | |
1127 | SCM um_test; | |
1128 | SCM um_sequence; | |
1129 | SCM um_clause; | |
1130 | ||
bc36d050 | 1131 | if (scm_is_eq (test, SCM_IM_ELSE)) |
212e58ed DH |
1132 | um_test = scm_sym_else; |
1133 | else | |
1134 | um_test = unmemoize_expression (test, env); | |
1135 | ||
a61f4e0c | 1136 | if (!scm_is_null (sequence) && scm_is_eq (SCM_CAR (sequence), |
bc36d050 | 1137 | SCM_IM_ARROW)) |
212e58ed DH |
1138 | { |
1139 | const SCM target = SCM_CADR (sequence); | |
1140 | const SCM um_target = unmemoize_expression (target, env); | |
1141 | um_sequence = scm_list_2 (scm_sym_arrow, um_target); | |
1142 | } | |
1143 | else | |
1144 | { | |
1145 | um_sequence = unmemoize_exprs (sequence, env); | |
1146 | } | |
1147 | ||
1148 | um_clause = scm_cons (um_test, um_sequence); | |
1149 | um_clauses = scm_cons (um_clause, um_clauses); | |
1150 | } | |
1151 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1152 | ||
1153 | return scm_cons (scm_sym_cond, um_clauses); | |
1154 | } | |
1155 | ||
1cc91f1b | 1156 | |
0f572ba7 DH |
1157 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1158 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1159 | |
9fbee57e DH |
1160 | /* Guile provides an extension to R5RS' define syntax to represent function |
1161 | * currying in a compact way. With this extension, it is allowed to write | |
1162 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1163 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1164 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1165 | * should be either a sequence of zero or more variables, or a sequence of one | |
1166 | * or more variables followed by a space-delimited period and another | |
1167 | * variable. Each level of argument nesting wraps the <body> within another | |
1168 | * lambda expression. For example, the following forms are allowed, each one | |
1169 | * followed by an equivalent, more explicit implementation. | |
1170 | * Example 1: | |
1171 | * (define ((a b . c) . d) <body>) is equivalent to | |
1172 | * (define a (lambda (b . c) (lambda d <body>))) | |
1173 | * Example 2: | |
1174 | * (define (((a) b) c . d) <body>) is equivalent to | |
1175 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1176 | */ | |
1177 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1178 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1179 | static SCM |
1180 | canonicalize_define (const SCM expr) | |
5280aaca | 1181 | { |
cc56ba80 DH |
1182 | SCM body; |
1183 | SCM variable; | |
1184 | ||
1185 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1186 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1187 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1188 | ||
1189 | body = SCM_CDR (cdr_expr); | |
1190 | variable = SCM_CAR (cdr_expr); | |
a61f4e0c | 1191 | while (scm_is_pair (variable)) |
5280aaca | 1192 | { |
cc56ba80 DH |
1193 | /* This while loop realizes function currying by variable nesting. |
1194 | * Variable is known to be a nested-variable. In every iteration of the | |
1195 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1196 | * innermost one. Note that we don't check for duplicate formals here: |
1197 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1198 | const SCM formals = SCM_CDR (variable); |
1199 | const SCM tail = scm_cons (formals, body); | |
1200 | ||
1201 | /* Add source properties to each new lambda expression: */ | |
1202 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1203 | ||
1204 | body = scm_list_1 (lambda); | |
1205 | variable = SCM_CAR (variable); | |
5280aaca | 1206 | } |
cc95e00a | 1207 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
cc56ba80 DH |
1208 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); |
1209 | ||
0f572ba7 DH |
1210 | SCM_SETCAR (cdr_expr, variable); |
1211 | SCM_SETCDR (cdr_expr, body); | |
1212 | return expr; | |
1213 | } | |
1214 | ||
36245b66 DH |
1215 | /* According to section 5.2.1 of R5RS we first have to make sure that the |
1216 | * variable is bound, and then perform the (set! variable expression) | |
1217 | * operation. This means, that within the expression we may already assign | |
1218 | * values to variable: (define foo (begin (set! foo 1) (+ foo 1))) */ | |
0f572ba7 DH |
1219 | SCM |
1220 | scm_m_define (SCM expr, SCM env) | |
1221 | { | |
6bff1368 | 1222 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 1223 | |
6bff1368 DH |
1224 | { |
1225 | const SCM canonical_definition = canonicalize_define (expr); | |
1226 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1227 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
36245b66 DH |
1228 | const SCM location |
1229 | = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); | |
1230 | const SCM value = scm_eval_car (SCM_CDR (cdr_canonical_definition), env); | |
6bff1368 | 1231 | |
6bff1368 DH |
1232 | if (SCM_REC_PROCNAMES_P) |
1233 | { | |
1234 | SCM tmp = value; | |
1235 | while (SCM_MACROP (tmp)) | |
1236 | tmp = SCM_MACRO_CODE (tmp); | |
1237 | if (SCM_CLOSUREP (tmp) | |
1238 | /* Only the first definition determines the name. */ | |
7888309b | 1239 | && scm_is_false (scm_procedure_property (tmp, scm_sym_name))) |
6bff1368 DH |
1240 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); |
1241 | } | |
0f572ba7 | 1242 | |
36245b66 | 1243 | SCM_VARIABLE_SET (location, value); |
6bff1368 DH |
1244 | |
1245 | return SCM_UNSPECIFIED; | |
1246 | } | |
0f2d19dd JB |
1247 | } |
1248 | ||
1249 | ||
8ae95199 DH |
1250 | /* This is a helper function for forms (<keyword> <expression>) that are |
1251 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1252 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1253 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1254 | static SCM | |
1255 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1256 | { | |
1257 | const SCM cdr_expr = SCM_CDR (expr); | |
1258 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1259 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1260 | ||
1261 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1262 | ||
1263 | return expr; | |
1264 | } | |
1265 | ||
1266 | ||
3b88ed2a | 1267 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1268 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1269 | |
9fbee57e DH |
1270 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1271 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1272 | * the empty list represents the empty parameter list. This representation | |
1273 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1274 | SCM |
8ae95199 | 1275 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1276 | { |
8ae95199 DH |
1277 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1278 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1279 | return new_expr; | |
0f2d19dd JB |
1280 | } |
1281 | ||
212e58ed DH |
1282 | static SCM |
1283 | unmemoize_delay (const SCM expr, const SCM env) | |
1284 | { | |
1285 | const SCM thunk_expr = SCM_CADDR (expr); | |
1286 | return scm_list_2 (scm_sym_delay, unmemoize_expression (thunk_expr, env)); | |
1287 | } | |
1288 | ||
8ea46249 | 1289 | |
a954ce1d DH |
1290 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1291 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1292 | ||
302c12b4 | 1293 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1294 | * reversed here. During the evaluation this allows for simple consing of the |
1295 | * results of the inits and steps: | |
302c12b4 | 1296 | |
0f2d19dd | 1297 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1298 | (<var2> <init2>) |
1299 | ... ) | |
1300 | (<test> <return>) | |
1301 | <body>) | |
302c12b4 | 1302 | |
0f2d19dd | 1303 | ;; becomes |
302c12b4 | 1304 | |
e681d187 | 1305 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1306 | (varn ... var2 var1) |
1307 | (<test> <return>) | |
1308 | (<body>) | |
1309 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1310 | */ |
0f2d19dd | 1311 | SCM |
a954ce1d | 1312 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1313 | { |
a954ce1d DH |
1314 | SCM variables = SCM_EOL; |
1315 | SCM init_forms = SCM_EOL; | |
1316 | SCM step_forms = SCM_EOL; | |
1317 | SCM binding_idx; | |
1318 | SCM cddr_expr; | |
1319 | SCM exit_clause; | |
1320 | SCM commands; | |
1321 | SCM tail; | |
1322 | ||
1323 | const SCM cdr_expr = SCM_CDR (expr); | |
1324 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1325 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1326 | ||
1327 | /* Collect variables, init and step forms. */ | |
1328 | binding_idx = SCM_CAR (cdr_expr); | |
1329 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1330 | s_bad_bindings, binding_idx, expr); | |
a61f4e0c | 1331 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1332 | { |
a954ce1d DH |
1333 | const SCM binding = SCM_CAR (binding_idx); |
1334 | const long length = scm_ilength (binding); | |
1335 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1336 | s_bad_binding, binding, expr); | |
1337 | ||
302c12b4 | 1338 | { |
a954ce1d DH |
1339 | const SCM name = SCM_CAR (binding); |
1340 | const SCM init = SCM_CADR (binding); | |
1341 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
cc95e00a | 1342 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
7888309b | 1343 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, variables)), |
4610b011 DH |
1344 | s_duplicate_binding, name, expr); |
1345 | ||
a954ce1d DH |
1346 | variables = scm_cons (name, variables); |
1347 | init_forms = scm_cons (init, init_forms); | |
1348 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1349 | } |
0f2d19dd | 1350 | } |
a954ce1d DH |
1351 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1352 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1353 | ||
1354 | /* Memoize the test form and the exit sequence. */ | |
1355 | cddr_expr = SCM_CDR (cdr_expr); | |
1356 | exit_clause = SCM_CAR (cddr_expr); | |
1357 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1358 | s_bad_exit_clause, exit_clause, expr); | |
1359 | ||
1360 | commands = SCM_CDR (cddr_expr); | |
1361 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1362 | tail = scm_cons2 (init_forms, variables, tail); | |
1363 | SCM_SETCAR (expr, SCM_IM_DO); | |
1364 | SCM_SETCDR (expr, tail); | |
1365 | return expr; | |
0f2d19dd JB |
1366 | } |
1367 | ||
212e58ed DH |
1368 | static SCM |
1369 | unmemoize_do (const SCM expr, const SCM env) | |
1370 | { | |
1371 | const SCM cdr_expr = SCM_CDR (expr); | |
1372 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1373 | const SCM rnames = SCM_CAR (cddr_expr); | |
1374 | const SCM extended_env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
1375 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1376 | const SCM exit_sequence = SCM_CAR (cdddr_expr); | |
1377 | const SCM um_exit_sequence = unmemoize_exprs (exit_sequence, extended_env); | |
1378 | const SCM cddddr_expr = SCM_CDR (cdddr_expr); | |
1379 | const SCM um_body = unmemoize_exprs (SCM_CAR (cddddr_expr), extended_env); | |
1380 | ||
1381 | /* build transformed binding list */ | |
1382 | SCM um_names = scm_reverse (rnames); | |
1383 | SCM um_inits = unmemoize_exprs (SCM_CAR (cdr_expr), env); | |
1384 | SCM um_steps = unmemoize_exprs (SCM_CDR (cddddr_expr), extended_env); | |
1385 | SCM um_bindings = SCM_EOL; | |
a61f4e0c | 1386 | while (!scm_is_null (um_names)) |
212e58ed DH |
1387 | { |
1388 | const SCM name = SCM_CAR (um_names); | |
1389 | const SCM init = SCM_CAR (um_inits); | |
1390 | SCM step = SCM_CAR (um_steps); | |
bc36d050 | 1391 | step = scm_is_eq (step, name) ? SCM_EOL : scm_list_1 (step); |
212e58ed DH |
1392 | |
1393 | um_bindings = scm_cons (scm_cons2 (name, init, step), um_bindings); | |
1394 | ||
1395 | um_names = SCM_CDR (um_names); | |
1396 | um_inits = SCM_CDR (um_inits); | |
1397 | um_steps = SCM_CDR (um_steps); | |
1398 | } | |
1399 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); | |
1400 | ||
1401 | return scm_cons (scm_sym_do, | |
1402 | scm_cons2 (um_bindings, um_exit_sequence, um_body)); | |
1403 | } | |
1404 | ||
b8229a3b | 1405 | |
3b88ed2a | 1406 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1407 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1408 | |
9fbee57e | 1409 | SCM |
4610b011 | 1410 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1411 | { |
4610b011 DH |
1412 | const SCM cdr_expr = SCM_CDR (expr); |
1413 | const long length = scm_ilength (cdr_expr); | |
1414 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1415 | SCM_SETCAR (expr, SCM_IM_IF); | |
1416 | return expr; | |
0f2d19dd JB |
1417 | } |
1418 | ||
212e58ed DH |
1419 | static SCM |
1420 | unmemoize_if (const SCM expr, const SCM env) | |
1421 | { | |
1422 | const SCM cdr_expr = SCM_CDR (expr); | |
1423 | const SCM um_condition = unmemoize_expression (SCM_CAR (cdr_expr), env); | |
1424 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1425 | const SCM um_then = unmemoize_expression (SCM_CAR (cddr_expr), env); | |
1426 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1427 | ||
a61f4e0c | 1428 | if (scm_is_null (cdddr_expr)) |
212e58ed DH |
1429 | { |
1430 | return scm_list_3 (scm_sym_if, um_condition, um_then); | |
1431 | } | |
1432 | else | |
1433 | { | |
1434 | const SCM um_else = unmemoize_expression (SCM_CAR (cdddr_expr), env); | |
1435 | return scm_list_4 (scm_sym_if, um_condition, um_then, um_else); | |
1436 | } | |
1437 | } | |
1438 | ||
302c12b4 | 1439 | |
3b88ed2a | 1440 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1441 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1442 | |
4610b011 DH |
1443 | /* A helper function for memoize_lambda to support checking for duplicate |
1444 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1445 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1446 | * forms that a formal argument can have: | |
1447 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1448 | static int |
4610b011 | 1449 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1450 | { |
a61f4e0c | 1451 | for (; scm_is_pair (list); list = SCM_CDR (list)) |
9fbee57e | 1452 | { |
bc36d050 | 1453 | if (scm_is_eq (SCM_CAR (list), obj)) |
4610b011 | 1454 | return 1; |
9fbee57e | 1455 | } |
bc36d050 | 1456 | return scm_is_eq (list, obj); |
5cb22e96 DH |
1457 | } |
1458 | ||
28d52ebb | 1459 | SCM |
03a3e941 | 1460 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1461 | { |
9fbee57e | 1462 | SCM formals; |
03a3e941 | 1463 | SCM formals_idx; |
34adf7ea DH |
1464 | SCM cddr_expr; |
1465 | int documentation; | |
1466 | SCM body; | |
1467 | SCM new_body; | |
03a3e941 DH |
1468 | |
1469 | const SCM cdr_expr = SCM_CDR (expr); | |
1470 | const long length = scm_ilength (cdr_expr); | |
1471 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1472 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1473 | |
03a3e941 DH |
1474 | /* Before iterating the list of formal arguments, make sure the formals |
1475 | * actually are given as either a symbol or a non-cyclic list. */ | |
1476 | formals = SCM_CAR (cdr_expr); | |
a61f4e0c | 1477 | if (scm_is_pair (formals)) |
03a3e941 DH |
1478 | { |
1479 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1480 | * detected, report a 'Bad formals' error. */ | |
1481 | } | |
1482 | else | |
1483 | { | |
a61f4e0c | 1484 | ASSERT_SYNTAX_2 (scm_is_symbol (formals) || scm_is_null (formals), |
03a3e941 DH |
1485 | s_bad_formals, formals, expr); |
1486 | } | |
1cc91f1b | 1487 | |
03a3e941 DH |
1488 | /* Now iterate the list of formal arguments to check if all formals are |
1489 | * symbols, and that there are no duplicates. */ | |
1490 | formals_idx = formals; | |
a61f4e0c | 1491 | while (scm_is_pair (formals_idx)) |
0f2d19dd | 1492 | { |
03a3e941 DH |
1493 | const SCM formal = SCM_CAR (formals_idx); |
1494 | const SCM next_idx = SCM_CDR (formals_idx); | |
cc95e00a | 1495 | ASSERT_SYNTAX_2 (scm_is_symbol (formal), s_bad_formal, formal, expr); |
03a3e941 DH |
1496 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), |
1497 | s_duplicate_formal, formal, expr); | |
1498 | formals_idx = next_idx; | |
0f2d19dd | 1499 | } |
a61f4e0c | 1500 | ASSERT_SYNTAX_2 (scm_is_null (formals_idx) || scm_is_symbol (formals_idx), |
03a3e941 | 1501 | s_bad_formal, formals_idx, expr); |
9fbee57e | 1502 | |
34adf7ea DH |
1503 | /* Memoize the body. Keep a potential documentation string. */ |
1504 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1505 | * some external database. Otherwise it will slow down execution, since | |
1506 | * the documentation string will have to be skipped with every execution | |
1507 | * of the closure. */ | |
1508 | cddr_expr = SCM_CDR (cdr_expr); | |
7f9994d9 | 1509 | documentation = (length >= 3 && scm_is_string (SCM_CAR (cddr_expr))); |
34adf7ea | 1510 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; |
430b8401 | 1511 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1512 | |
1513 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1514 | if (documentation) | |
1515 | SCM_SETCDR (cddr_expr, new_body); | |
1516 | else | |
1517 | SCM_SETCDR (cdr_expr, new_body); | |
1518 | return expr; | |
0f2d19dd | 1519 | } |
6dbd0af5 | 1520 | |
212e58ed DH |
1521 | static SCM |
1522 | unmemoize_lambda (const SCM expr, const SCM env) | |
1523 | { | |
1524 | const SCM formals = SCM_CADR (expr); | |
1525 | const SCM body = SCM_CDDR (expr); | |
1526 | ||
1527 | const SCM new_env = SCM_EXTEND_ENV (formals, SCM_EOL, env); | |
1528 | const SCM um_formals = scm_i_finite_list_copy (formals); | |
1529 | const SCM um_body = unmemoize_exprs (body, new_env); | |
1530 | ||
1531 | return scm_cons2 (scm_sym_lambda, um_formals, um_body); | |
1532 | } | |
1533 | ||
0f2d19dd | 1534 | |
d6754c23 | 1535 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1536 | static void |
d6754c23 | 1537 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1538 | { |
d6754c23 | 1539 | SCM binding_idx; |
302c12b4 | 1540 | |
d6754c23 DH |
1541 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1542 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1543 | |
d6754c23 | 1544 | binding_idx = bindings; |
a61f4e0c | 1545 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1546 | { |
d6754c23 DH |
1547 | SCM name; /* const */ |
1548 | ||
1549 | const SCM binding = SCM_CAR (binding_idx); | |
1550 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1551 | s_bad_binding, binding, expr); | |
1552 | ||
1553 | name = SCM_CAR (binding); | |
cc95e00a | 1554 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
0f2d19dd | 1555 | } |
d6754c23 | 1556 | } |
26d5b9b4 | 1557 | |
d6754c23 DH |
1558 | |
1559 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1560 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1561 | * variables are returned in a list with their order reversed, and the init | |
1562 | * forms are returned in a list in the same order as they are given in the | |
1563 | * bindings. If a duplicate variable name is detected, an error is | |
1564 | * signalled. */ | |
1565 | static void | |
1566 | transform_bindings ( | |
1567 | const SCM bindings, const SCM expr, | |
1568 | SCM *const rvarptr, SCM *const initptr ) | |
1569 | { | |
1570 | SCM rvariables = SCM_EOL; | |
1571 | SCM rinits = SCM_EOL; | |
1572 | SCM binding_idx = bindings; | |
a61f4e0c | 1573 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
d6754c23 DH |
1574 | { |
1575 | const SCM binding = SCM_CAR (binding_idx); | |
1576 | const SCM cdr_binding = SCM_CDR (binding); | |
1577 | const SCM name = SCM_CAR (binding); | |
7888309b | 1578 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rvariables)), |
d6754c23 DH |
1579 | s_duplicate_binding, name, expr); |
1580 | rvariables = scm_cons (name, rvariables); | |
1581 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1582 | } | |
1583 | *rvarptr = rvariables; | |
1584 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1585 | } |
1586 | ||
302c12b4 | 1587 | |
3b88ed2a | 1588 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1589 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1590 | |
d6754c23 DH |
1591 | /* This function is a helper function for memoize_let. It transforms |
1592 | * (let name ((var init) ...) body ...) into | |
1593 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1594 | * and memoizes the expression. It is assumed that the caller has checked | |
1595 | * that name is a symbol and that there are bindings and a body. */ | |
1596 | static SCM | |
1597 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1598 | { | |
1599 | SCM rvariables; | |
1600 | SCM variables; | |
1601 | SCM inits; | |
1602 | ||
1603 | const SCM cdr_expr = SCM_CDR (expr); | |
1604 | const SCM name = SCM_CAR (cdr_expr); | |
1605 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1606 | const SCM bindings = SCM_CAR (cddr_expr); | |
1607 | check_bindings (bindings, expr); | |
1608 | ||
1609 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1610 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1611 | ||
1612 | { | |
1613 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1614 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1615 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1616 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1617 | ||
1618 | const SCM rvar = scm_list_1 (name); | |
1619 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1620 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1621 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1622 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1623 | return scm_cons_source (expr, letrec_form, inits); | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1628 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1629 | SCM |
d6754c23 | 1630 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1631 | { |
d6754c23 DH |
1632 | SCM bindings; |
1633 | ||
1634 | const SCM cdr_expr = SCM_CDR (expr); | |
1635 | const long length = scm_ilength (cdr_expr); | |
1636 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1637 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1638 | |
d6754c23 | 1639 | bindings = SCM_CAR (cdr_expr); |
cc95e00a | 1640 | if (scm_is_symbol (bindings)) |
26d5b9b4 | 1641 | { |
d6754c23 DH |
1642 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1643 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1644 | } |
d6754c23 DH |
1645 | |
1646 | check_bindings (bindings, expr); | |
a61f4e0c | 1647 | if (scm_is_null (bindings) || scm_is_null (SCM_CDR (bindings))) |
26d5b9b4 | 1648 | { |
d6754c23 | 1649 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1650 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1651 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1652 | } |
302c12b4 DH |
1653 | else |
1654 | { | |
d6754c23 DH |
1655 | /* plain let */ |
1656 | SCM rvariables; | |
1657 | SCM inits; | |
1658 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1659 | |
302c12b4 | 1660 | { |
430b8401 | 1661 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1662 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1663 | SCM_SETCAR (expr, SCM_IM_LET); | |
1664 | SCM_SETCDR (expr, new_tail); | |
1665 | return expr; | |
302c12b4 DH |
1666 | } |
1667 | } | |
0f2d19dd JB |
1668 | } |
1669 | ||
212e58ed DH |
1670 | static SCM |
1671 | build_binding_list (SCM rnames, SCM rinits) | |
1672 | { | |
1673 | SCM bindings = SCM_EOL; | |
a61f4e0c | 1674 | while (!scm_is_null (rnames)) |
212e58ed DH |
1675 | { |
1676 | const SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); | |
1677 | bindings = scm_cons (binding, bindings); | |
1678 | rnames = SCM_CDR (rnames); | |
1679 | rinits = SCM_CDR (rinits); | |
1680 | } | |
1681 | return bindings; | |
1682 | } | |
1683 | ||
1684 | static SCM | |
1685 | unmemoize_let (const SCM expr, const SCM env) | |
1686 | { | |
1687 | const SCM cdr_expr = SCM_CDR (expr); | |
1688 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1689 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1690 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1691 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), env); | |
1692 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1693 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1694 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1695 | ||
1696 | return scm_cons2 (scm_sym_let, um_bindings, um_body); | |
1697 | } | |
1698 | ||
1699 | ||
1700 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); | |
1701 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); | |
1702 | ||
1703 | SCM | |
1704 | scm_m_letrec (SCM expr, SCM env) | |
1705 | { | |
1706 | SCM bindings; | |
1707 | ||
1708 | const SCM cdr_expr = SCM_CDR (expr); | |
1709 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1710 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1711 | ||
1712 | bindings = SCM_CAR (cdr_expr); | |
a61f4e0c | 1713 | if (scm_is_null (bindings)) |
212e58ed DH |
1714 | { |
1715 | /* no bindings, let* is executed faster */ | |
1716 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1717 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); | |
1718 | } | |
1719 | else | |
1720 | { | |
1721 | SCM rvariables; | |
1722 | SCM inits; | |
1723 | SCM new_body; | |
1724 | ||
1725 | check_bindings (bindings, expr); | |
1726 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1727 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1728 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); | |
1729 | } | |
1730 | } | |
1731 | ||
1732 | static SCM | |
1733 | unmemoize_letrec (const SCM expr, const SCM env) | |
1734 | { | |
1735 | const SCM cdr_expr = SCM_CDR (expr); | |
1736 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1737 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1738 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1739 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), extended_env); | |
1740 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1741 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1742 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1743 | ||
1744 | return scm_cons2 (scm_sym_letrec, um_bindings, um_body); | |
1745 | } | |
1746 | ||
1747 | ||
0f2d19dd | 1748 | |
3b88ed2a | 1749 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1750 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1751 | |
d6754c23 DH |
1752 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1753 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1754 | SCM |
d6754c23 | 1755 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1756 | { |
d6754c23 | 1757 | SCM binding_idx; |
d6754c23 | 1758 | SCM new_body; |
0f2d19dd | 1759 | |
d6754c23 DH |
1760 | const SCM cdr_expr = SCM_CDR (expr); |
1761 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1762 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1763 | |
d6754c23 DH |
1764 | binding_idx = SCM_CAR (cdr_expr); |
1765 | check_bindings (binding_idx, expr); | |
1766 | ||
461bffb1 DH |
1767 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1768 | * transformation is done in place. At the beginning of one iteration of | |
1769 | * the loop the variable binding_idx holds the form | |
1770 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1771 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1772 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1773 | * untouched. After the execution of the loop, P1 will hold | |
1774 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1775 | * and binding_idx will hold P3. */ | |
a61f4e0c | 1776 | while (!scm_is_null (binding_idx)) |
9fbee57e | 1777 | { |
461bffb1 | 1778 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1779 | const SCM binding = SCM_CAR (binding_idx); |
1780 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1781 | const SCM cdr_binding = SCM_CDR (binding); |
1782 | ||
1783 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1784 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1785 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1786 | ||
1787 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1788 | } |
1789 | ||
430b8401 | 1790 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1791 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1792 | /* the bindings have been changed in place */ | |
1793 | SCM_SETCDR (cdr_expr, new_body); | |
1794 | return expr; | |
9fbee57e | 1795 | } |
b8229a3b | 1796 | |
212e58ed DH |
1797 | static SCM |
1798 | unmemoize_letstar (const SCM expr, const SCM env) | |
0f2d19dd | 1799 | { |
d6754c23 | 1800 | const SCM cdr_expr = SCM_CDR (expr); |
212e58ed DH |
1801 | const SCM body = SCM_CDR (cdr_expr); |
1802 | SCM bindings = SCM_CAR (cdr_expr); | |
1803 | SCM um_bindings = SCM_EOL; | |
1804 | SCM extended_env = env; | |
1805 | SCM um_body; | |
d6754c23 | 1806 | |
a61f4e0c | 1807 | while (!scm_is_null (bindings)) |
9fbee57e | 1808 | { |
212e58ed DH |
1809 | const SCM variable = SCM_CAR (bindings); |
1810 | const SCM init = SCM_CADR (bindings); | |
1811 | const SCM um_init = unmemoize_expression (init, extended_env); | |
1812 | um_bindings = scm_cons (scm_list_2 (variable, um_init), um_bindings); | |
1813 | extended_env = SCM_EXTEND_ENV (variable, SCM_BOOL_F, extended_env); | |
1814 | bindings = SCM_CDDR (bindings); | |
9fbee57e | 1815 | } |
212e58ed | 1816 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); |
d6754c23 | 1817 | |
212e58ed DH |
1818 | um_body = unmemoize_exprs (body, extended_env); |
1819 | ||
1820 | return scm_cons2 (scm_sym_letstar, um_bindings, um_body); | |
0f2d19dd JB |
1821 | } |
1822 | ||
73b64342 | 1823 | |
3b88ed2a | 1824 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1825 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1826 | |
1827 | SCM | |
21628685 | 1828 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1829 | { |
21628685 DH |
1830 | const SCM cdr_expr = SCM_CDR (expr); |
1831 | const long length = scm_ilength (cdr_expr); | |
1832 | ||
1833 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1834 | ||
1835 | if (length == 0) | |
1836 | { | |
1837 | /* Special case: (or) is replaced by #f. */ | |
1838 | return SCM_BOOL_F; | |
1839 | } | |
9fbee57e | 1840 | else |
21628685 DH |
1841 | { |
1842 | SCM_SETCAR (expr, SCM_IM_OR); | |
1843 | return expr; | |
1844 | } | |
73b64342 MD |
1845 | } |
1846 | ||
212e58ed DH |
1847 | static SCM |
1848 | unmemoize_or (const SCM expr, const SCM env) | |
1849 | { | |
1850 | return scm_cons (scm_sym_or, unmemoize_exprs (SCM_CDR (expr), env)); | |
1851 | } | |
1852 | ||
73b64342 | 1853 | |
9fbee57e DH |
1854 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1855 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1856 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1857 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1858 | |
1859 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1860 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1861 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1862 | * nesting level and is known to be greater than zero. */ | |
1863 | static SCM | |
1864 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1865 | { |
a61f4e0c | 1866 | if (scm_is_pair (form)) |
c96d76b8 | 1867 | { |
21628685 | 1868 | const SCM tmp = SCM_CAR (form); |
bc36d050 | 1869 | if (scm_is_eq (tmp, scm_sym_quasiquote)) |
9fbee57e | 1870 | { |
21628685 DH |
1871 | const SCM args = SCM_CDR (form); |
1872 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1873 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1874 | } | |
bc36d050 | 1875 | else if (scm_is_eq (tmp, scm_sym_unquote)) |
9fbee57e | 1876 | { |
21628685 DH |
1877 | const SCM args = SCM_CDR (form); |
1878 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1879 | if (depth - 1 == 0) |
1880 | return scm_eval_car (args, env); | |
1881 | else | |
1882 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1883 | } | |
a61f4e0c | 1884 | else if (scm_is_pair (tmp) |
bc36d050 | 1885 | && scm_is_eq (SCM_CAR (tmp), scm_sym_uq_splicing)) |
9fbee57e | 1886 | { |
21628685 DH |
1887 | const SCM args = SCM_CDR (tmp); |
1888 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1889 | if (depth - 1 == 0) |
1890 | { | |
21628685 DH |
1891 | const SCM list = scm_eval_car (args, env); |
1892 | const SCM rest = SCM_CDR (form); | |
1893 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1894 | s_splicing, list, form); | |
9fbee57e DH |
1895 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1896 | } | |
1897 | else | |
1898 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1899 | iqq (SCM_CDR (form), env, depth)); | |
1900 | } | |
1901 | else | |
1902 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1903 | iqq (SCM_CDR (form), env, depth)); | |
1904 | } | |
4057a3e0 MV |
1905 | else if (scm_is_vector (form)) |
1906 | return scm_vector (iqq (scm_vector_to_list (form), env, depth)); | |
9fbee57e DH |
1907 | else |
1908 | return form; | |
1909 | } | |
1910 | ||
1911 | SCM | |
21628685 | 1912 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1913 | { |
21628685 DH |
1914 | const SCM cdr_expr = SCM_CDR (expr); |
1915 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1916 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1917 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1918 | } |
1919 | ||
1920 | ||
3b88ed2a | 1921 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1922 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1923 | ||
1924 | SCM | |
21628685 | 1925 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1926 | { |
21628685 DH |
1927 | SCM quotee; |
1928 | ||
1929 | const SCM cdr_expr = SCM_CDR (expr); | |
1930 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1931 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1932 | quotee = SCM_CAR (cdr_expr); | |
5fb64383 | 1933 | if (is_self_quoting_p (quotee)) |
21628685 | 1934 | return quotee; |
e7313a9d | 1935 | |
21628685 | 1936 | SCM_SETCAR (expr, SCM_IM_QUOTE); |
e7313a9d | 1937 | SCM_SETCDR (expr, quotee); |
21628685 | 1938 | return expr; |
9fbee57e DH |
1939 | } |
1940 | ||
e7313a9d DH |
1941 | static SCM |
1942 | unmemoize_quote (const SCM expr, const SCM env SCM_UNUSED) | |
1943 | { | |
1944 | return scm_list_2 (scm_sym_quote, SCM_CDR (expr)); | |
1945 | } | |
1946 | ||
9fbee57e DH |
1947 | |
1948 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1949 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1950 | static const char s_set_x[] = "set!"; |
1951 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1952 | ||
1953 | SCM | |
82b3e2c6 | 1954 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1955 | { |
82b3e2c6 | 1956 | SCM variable; |
36245b66 | 1957 | SCM new_variable; |
82b3e2c6 DH |
1958 | |
1959 | const SCM cdr_expr = SCM_CDR (expr); | |
1960 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1961 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1962 | variable = SCM_CAR (cdr_expr); | |
36245b66 DH |
1963 | |
1964 | /* Memoize the variable form. */ | |
cc95e00a | 1965 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
36245b66 | 1966 | new_variable = lookup_symbol (variable, env); |
36245b66 DH |
1967 | /* Leave the memoization of unbound symbols to lazy memoization: */ |
1968 | if (SCM_UNBNDP (new_variable)) | |
1969 | new_variable = variable; | |
82b3e2c6 DH |
1970 | |
1971 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
36245b66 | 1972 | SCM_SETCAR (cdr_expr, new_variable); |
82b3e2c6 | 1973 | return expr; |
9fbee57e DH |
1974 | } |
1975 | ||
212e58ed DH |
1976 | static SCM |
1977 | unmemoize_set_x (const SCM expr, const SCM env) | |
1978 | { | |
1979 | return scm_cons (scm_sym_set_x, unmemoize_exprs (SCM_CDR (expr), env)); | |
1980 | } | |
1981 | ||
9fbee57e DH |
1982 | |
1983 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1984 | ||
1985 | ||
3b88ed2a | 1986 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1987 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1988 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1989 | ||
1990 | SCM | |
82b3e2c6 | 1991 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1992 | { |
82b3e2c6 DH |
1993 | const SCM cdr_expr = SCM_CDR (expr); |
1994 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1995 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1996 | |
82b3e2c6 DH |
1997 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1998 | return expr; | |
1999 | } | |
2e171178 | 2000 | |
212e58ed DH |
2001 | static SCM |
2002 | unmemoize_apply (const SCM expr, const SCM env) | |
2003 | { | |
2004 | return scm_list_2 (scm_sym_atapply, unmemoize_exprs (SCM_CDR (expr), env)); | |
2005 | } | |
2006 | ||
2e171178 | 2007 | |
3b88ed2a | 2008 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 2009 | |
82b3e2c6 DH |
2010 | /* FIXME: The following explanation should go into the documentation: */ |
2011 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
2012 | * the global variables named by `var's (symbols, not evaluated), creating | |
2013 | * them if they don't exist, executes body, and then restores the previous | |
2014 | * values of the `var's. Additionally, whenever control leaves body, the | |
2015 | * values of the `var's are saved and restored when control returns. It is an | |
2016 | * error when a symbol appears more than once among the `var's. All `init's | |
2017 | * are evaluated before any `var' is set. | |
2018 | * | |
2019 | * Think of this as `let' for dynamic scope. | |
2020 | */ | |
2021 | ||
2022 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
2023 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
2024 | * | |
2025 | * FIXME - also implement `@bind*'. | |
2026 | */ | |
73b64342 | 2027 | SCM |
82b3e2c6 | 2028 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 2029 | { |
82b3e2c6 DH |
2030 | SCM bindings; |
2031 | SCM rvariables; | |
2032 | SCM inits; | |
2033 | SCM variable_idx; | |
2e171178 | 2034 | |
82b3e2c6 | 2035 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 2036 | |
82b3e2c6 DH |
2037 | const SCM cdr_expr = SCM_CDR (expr); |
2038 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2039 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
2040 | bindings = SCM_CAR (cdr_expr); | |
2041 | check_bindings (bindings, expr); | |
2042 | transform_bindings (bindings, expr, &rvariables, &inits); | |
2043 | ||
2044 | for (variable_idx = rvariables; | |
a61f4e0c | 2045 | !scm_is_null (variable_idx); |
82b3e2c6 | 2046 | variable_idx = SCM_CDR (variable_idx)) |
73b64342 | 2047 | { |
82b3e2c6 DH |
2048 | /* The first call to scm_sym2var will look beyond the current module, |
2049 | * while the second call wont. */ | |
2050 | const SCM variable = SCM_CAR (variable_idx); | |
2051 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
7888309b | 2052 | if (scm_is_false (new_variable)) |
82b3e2c6 DH |
2053 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); |
2054 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 2055 | } |
82b3e2c6 DH |
2056 | |
2057 | SCM_SETCAR (expr, SCM_IM_BIND); | |
2058 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
2059 | return expr; | |
73b64342 | 2060 | } |
73b64342 | 2061 | |
b0c5d67b | 2062 | |
3b88ed2a | 2063 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
2064 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
2065 | ||
9fbee57e | 2066 | SCM |
da48db62 | 2067 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2068 | { |
da48db62 DH |
2069 | const SCM cdr_expr = SCM_CDR (expr); |
2070 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2071 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2072 | ||
2073 | SCM_SETCAR (expr, SCM_IM_CONT); | |
2074 | return expr; | |
b0c5d67b | 2075 | } |
b0c5d67b | 2076 | |
212e58ed DH |
2077 | static SCM |
2078 | unmemoize_atcall_cc (const SCM expr, const SCM env) | |
2079 | { | |
2080 | return scm_list_2 (scm_sym_atcall_cc, unmemoize_exprs (SCM_CDR (expr), env)); | |
2081 | } | |
2082 | ||
b0c5d67b | 2083 | |
3b88ed2a | 2084 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 2085 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
2086 | |
2087 | SCM | |
da48db62 | 2088 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2089 | { |
da48db62 DH |
2090 | const SCM cdr_expr = SCM_CDR (expr); |
2091 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2092 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2093 | ||
2094 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
2095 | return expr; | |
b0c5d67b | 2096 | } |
b0c5d67b | 2097 | |
212e58ed DH |
2098 | static SCM |
2099 | unmemoize_at_call_with_values (const SCM expr, const SCM env) | |
2100 | { | |
2101 | return scm_list_2 (scm_sym_at_call_with_values, | |
2102 | unmemoize_exprs (SCM_CDR (expr), env)); | |
2103 | } | |
2104 | ||
2f263a6a MV |
2105 | #if 0 |
2106 | ||
2107 | /* See futures.h for a comment why futures are not enabled. | |
2108 | */ | |
b0c5d67b | 2109 | |
3b88ed2a | 2110 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 2111 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 2112 | |
9fbee57e DH |
2113 | /* Like promises, futures are implemented as closures with an empty |
2114 | * parameter list. Thus, (future <expression>) is transformed into | |
2115 | * (#@future '() <expression>), where the empty list represents the | |
2116 | * empty parameter list. This representation allows for easy creation | |
2117 | * of the closure during evaluation. */ | |
a513ead3 | 2118 | SCM |
8ae95199 | 2119 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 2120 | { |
8ae95199 DH |
2121 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
2122 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
2123 | return new_expr; | |
a513ead3 MV |
2124 | } |
2125 | ||
212e58ed DH |
2126 | static SCM |
2127 | unmemoize_future (const SCM expr, const SCM env) | |
2128 | { | |
2129 | const SCM thunk_expr = SCM_CADDR (expr); | |
2130 | return scm_list_2 (scm_sym_future, unmemoize_expression (thunk_expr, env)); | |
2131 | } | |
2132 | ||
2f263a6a | 2133 | #endif |
9fbee57e | 2134 | |
3b88ed2a | 2135 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
2136 | SCM_SYMBOL (scm_sym_setter, "setter"); |
2137 | ||
2138 | SCM | |
7893dbbf | 2139 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 2140 | { |
7893dbbf | 2141 | SCM target, exp_target; |
da48db62 DH |
2142 | |
2143 | const SCM cdr_expr = SCM_CDR (expr); | |
2144 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2145 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2146 | ||
2147 | target = SCM_CAR (cdr_expr); | |
a61f4e0c | 2148 | if (!scm_is_pair (target)) |
da48db62 DH |
2149 | { |
2150 | /* R5RS usage */ | |
2151 | return scm_m_set_x (expr, env); | |
2152 | } | |
9fbee57e | 2153 | else |
da48db62 DH |
2154 | { |
2155 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
2156 | /* Macroexpanding the target might return things of the form |
2157 | (begin <atom>). In that case, <atom> must be a symbol or a | |
2158 | variable and we memoize to (set! <atom> ...). | |
2159 | */ | |
2b189e65 | 2160 | exp_target = macroexp (target, env); |
bc36d050 | 2161 | if (scm_is_eq (SCM_CAR (exp_target), SCM_IM_BEGIN) |
a61f4e0c MV |
2162 | && !scm_is_null (SCM_CDR (exp_target)) |
2163 | && scm_is_null (SCM_CDDR (exp_target))) | |
7893dbbf MV |
2164 | { |
2165 | exp_target= SCM_CADR (exp_target); | |
cc95e00a | 2166 | ASSERT_SYNTAX_2 (scm_is_symbol (exp_target) |
6d1a2e9f MV |
2167 | || SCM_VARIABLEP (exp_target), |
2168 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
2169 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
2170 | SCM_CDR (cdr_expr))); | |
2171 | } | |
2172 | else | |
2173 | { | |
2174 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
2175 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
2176 | setter_proc_tail); | |
da48db62 | 2177 | |
7893dbbf MV |
2178 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
2179 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
2180 | cddr_expr)); | |
da48db62 | 2181 | |
7893dbbf MV |
2182 | SCM_SETCAR (expr, setter_proc); |
2183 | SCM_SETCDR (expr, setter_args); | |
2184 | return expr; | |
2185 | } | |
da48db62 | 2186 | } |
9fbee57e DH |
2187 | } |
2188 | ||
2189 | ||
a4aa2134 DH |
2190 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
2191 | * soon as the module system allows us to more freely create bindings in | |
2192 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2193 | * moved here. */ | |
212e58ed DH |
2194 | |
2195 | SCM_SYMBOL (sym_atslot_ref, "@slot-ref"); | |
2196 | ||
9fbee57e | 2197 | SCM |
9a848baf | 2198 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2199 | { |
9a848baf DH |
2200 | SCM slot_nr; |
2201 | ||
2202 | const SCM cdr_expr = SCM_CDR (expr); | |
2203 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2204 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2205 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2206 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9fbee57e | 2207 | |
9a848baf | 2208 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
e7313a9d | 2209 | SCM_SETCDR (cdr_expr, slot_nr); |
9a848baf DH |
2210 | return expr; |
2211 | } | |
9fbee57e | 2212 | |
212e58ed DH |
2213 | static SCM |
2214 | unmemoize_atslot_ref (const SCM expr, const SCM env) | |
2215 | { | |
2216 | const SCM instance = SCM_CADR (expr); | |
2217 | const SCM um_instance = unmemoize_expression (instance, env); | |
2218 | const SCM slot_nr = SCM_CDDR (expr); | |
2219 | return scm_list_3 (sym_atslot_ref, um_instance, slot_nr); | |
2220 | } | |
2221 | ||
9fbee57e | 2222 | |
a4aa2134 DH |
2223 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
2224 | * soon as the module system allows us to more freely create bindings in | |
2225 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2226 | * moved here. */ | |
212e58ed DH |
2227 | |
2228 | SCM_SYMBOL (sym_atslot_set_x, "@slot-set!"); | |
2229 | ||
9fbee57e | 2230 | SCM |
9a848baf | 2231 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2232 | { |
9a848baf DH |
2233 | SCM slot_nr; |
2234 | ||
2235 | const SCM cdr_expr = SCM_CDR (expr); | |
2236 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2237 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
2238 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2239 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9a848baf DH |
2240 | |
2241 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
2242 | return expr; | |
9fbee57e | 2243 | } |
9fbee57e | 2244 | |
212e58ed DH |
2245 | static SCM |
2246 | unmemoize_atslot_set_x (const SCM expr, const SCM env) | |
2247 | { | |
2248 | const SCM cdr_expr = SCM_CDR (expr); | |
2249 | const SCM instance = SCM_CAR (cdr_expr); | |
2250 | const SCM um_instance = unmemoize_expression (instance, env); | |
2251 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
2252 | const SCM slot_nr = SCM_CAR (cddr_expr); | |
2253 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
2254 | const SCM value = SCM_CAR (cdddr_expr); | |
2255 | const SCM um_value = unmemoize_expression (value, env); | |
2256 | return scm_list_4 (sym_atslot_set_x, um_instance, slot_nr, um_value); | |
2257 | } | |
2258 | ||
9fbee57e DH |
2259 | |
2260 | #if SCM_ENABLE_ELISP | |
2261 | ||
70c1c108 DH |
2262 | static const char s_defun[] = "Symbol's function definition is void"; |
2263 | ||
3b88ed2a | 2264 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 2265 | |
70c1c108 DH |
2266 | /* nil-cond expressions have the form |
2267 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 2268 | SCM |
70c1c108 | 2269 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2270 | { |
70c1c108 DH |
2271 | const long length = scm_ilength (SCM_CDR (expr)); |
2272 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
2273 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
2274 | ||
2275 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
2276 | return expr; | |
9fbee57e DH |
2277 | } |
2278 | ||
2279 | ||
3b88ed2a | 2280 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 2281 | |
70c1c108 DH |
2282 | /* The @fop-macro handles procedure and macro applications for elisp. The |
2283 | * input expression must have the form | |
2284 | * (@fop <var> (transformer-macro <expr> ...)) | |
2285 | * where <var> must be a symbol. The expression is transformed into the | |
2286 | * memoized form of either | |
2287 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
2288 | * if the value of var (across all aliasing) is not a macro, or | |
2289 | * (<un-aliased var> <expr> ...) | |
2290 | * if var is a macro. */ | |
9fbee57e | 2291 | SCM |
70c1c108 | 2292 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2293 | { |
70c1c108 DH |
2294 | SCM location; |
2295 | SCM symbol; | |
2296 | ||
2297 | const SCM cdr_expr = SCM_CDR (expr); | |
2298 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2299 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
2300 | ||
2301 | symbol = SCM_CAR (cdr_expr); | |
cc95e00a | 2302 | ASSERT_SYNTAX_2 (scm_is_symbol (symbol), s_bad_variable, symbol, expr); |
70c1c108 DH |
2303 | |
2304 | location = scm_symbol_fref (symbol); | |
2305 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
2306 | ||
2307 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
2308 | * look up such definitions, the chain of symbol definitions has to be | |
2309 | * followed up to the terminal symbol. */ | |
cc95e00a | 2310 | while (scm_is_symbol (SCM_VARIABLE_REF (location))) |
9fbee57e | 2311 | { |
70c1c108 DH |
2312 | const SCM alias = SCM_VARIABLE_REF (location); |
2313 | location = scm_symbol_fref (alias); | |
2314 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 2315 | } |
70c1c108 DH |
2316 | |
2317 | /* Memoize the value location belonging to the terminal symbol. */ | |
2318 | SCM_SETCAR (cdr_expr, location); | |
2319 | ||
2320 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2321 | { |
70c1c108 DH |
2322 | /* Since the location does not contain a macro, the form is a procedure |
2323 | * application. Replace `@fop' by `@apply' and transform the expression | |
2324 | * including the `transformer-macro'. */ | |
2325 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2326 | return expr; | |
2327 | } | |
2328 | else | |
2329 | { | |
2330 | /* Since the location contains a macro, the arguments should not be | |
2331 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2332 | * expression starts with the memoized variable, that is at the cdr of | |
2333 | * the input expression. */ | |
2334 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2335 | return cdr_expr; | |
9fbee57e | 2336 | } |
9fbee57e DH |
2337 | } |
2338 | ||
2339 | #endif /* SCM_ENABLE_ELISP */ | |
2340 | ||
2341 | ||
212e58ed DH |
2342 | static SCM |
2343 | unmemoize_builtin_macro (const SCM expr, const SCM env) | |
2344 | { | |
2345 | switch (ISYMNUM (SCM_CAR (expr))) | |
2346 | { | |
2347 | case (ISYMNUM (SCM_IM_AND)): | |
2348 | return unmemoize_and (expr, env); | |
2349 | ||
2350 | case (ISYMNUM (SCM_IM_BEGIN)): | |
2351 | return unmemoize_begin (expr, env); | |
2352 | ||
2353 | case (ISYMNUM (SCM_IM_CASE)): | |
2354 | return unmemoize_case (expr, env); | |
2355 | ||
2356 | case (ISYMNUM (SCM_IM_COND)): | |
2357 | return unmemoize_cond (expr, env); | |
2358 | ||
2359 | case (ISYMNUM (SCM_IM_DELAY)): | |
2360 | return unmemoize_delay (expr, env); | |
2361 | ||
2362 | case (ISYMNUM (SCM_IM_DO)): | |
2363 | return unmemoize_do (expr, env); | |
2364 | ||
2365 | case (ISYMNUM (SCM_IM_IF)): | |
2366 | return unmemoize_if (expr, env); | |
2367 | ||
2368 | case (ISYMNUM (SCM_IM_LAMBDA)): | |
2369 | return unmemoize_lambda (expr, env); | |
2370 | ||
2371 | case (ISYMNUM (SCM_IM_LET)): | |
2372 | return unmemoize_let (expr, env); | |
2373 | ||
2374 | case (ISYMNUM (SCM_IM_LETREC)): | |
2375 | return unmemoize_letrec (expr, env); | |
2376 | ||
2377 | case (ISYMNUM (SCM_IM_LETSTAR)): | |
2378 | return unmemoize_letstar (expr, env); | |
2379 | ||
2380 | case (ISYMNUM (SCM_IM_OR)): | |
2381 | return unmemoize_or (expr, env); | |
2382 | ||
2383 | case (ISYMNUM (SCM_IM_QUOTE)): | |
2384 | return unmemoize_quote (expr, env); | |
2385 | ||
2386 | case (ISYMNUM (SCM_IM_SET_X)): | |
2387 | return unmemoize_set_x (expr, env); | |
2388 | ||
2389 | case (ISYMNUM (SCM_IM_APPLY)): | |
2390 | return unmemoize_apply (expr, env); | |
2391 | ||
2392 | case (ISYMNUM (SCM_IM_BIND)): | |
2393 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2394 | ||
2395 | case (ISYMNUM (SCM_IM_CONT)): | |
2396 | return unmemoize_atcall_cc (expr, env); | |
2397 | ||
2398 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): | |
2399 | return unmemoize_at_call_with_values (expr, env); | |
2400 | ||
2f263a6a MV |
2401 | #if 0 |
2402 | /* See futures.h for a comment why futures are not enabled. | |
2403 | */ | |
212e58ed DH |
2404 | case (ISYMNUM (SCM_IM_FUTURE)): |
2405 | return unmemoize_future (expr, env); | |
2f263a6a | 2406 | #endif |
212e58ed DH |
2407 | |
2408 | case (ISYMNUM (SCM_IM_SLOT_REF)): | |
2409 | return unmemoize_atslot_ref (expr, env); | |
2410 | ||
2411 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): | |
2412 | return unmemoize_atslot_set_x (expr, env); | |
2413 | ||
2414 | case (ISYMNUM (SCM_IM_NIL_COND)): | |
2415 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2416 | ||
2417 | default: | |
2418 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2419 | } | |
2420 | } | |
2421 | ||
2422 | ||
9fcf3cbb DH |
2423 | /* scm_i_unmemocopy_expr and scm_i_unmemocopy_body take a memoized expression |
2424 | * respectively a memoized body together with its environment and rewrite it | |
2425 | * to its original form. Thus, these functions are the inversion of the | |
2426 | * rewrite rules above. The procedure is not optimized for speed. It's used | |
2427 | * in scm_i_unmemoize_expr, scm_procedure_source, macro_print and scm_iprin1. | |
212e58ed DH |
2428 | * |
2429 | * Unmemoizing is not a reliable process. You cannot in general expect to get | |
2430 | * the original source back. | |
2431 | * | |
2432 | * However, GOOPS currently relies on this for method compilation. This ought | |
2433 | * to change. */ | |
2434 | ||
2435 | SCM | |
9fcf3cbb DH |
2436 | scm_i_unmemocopy_expr (SCM expr, SCM env) |
2437 | { | |
2438 | const SCM source_properties = scm_whash_lookup (scm_source_whash, expr); | |
2439 | const SCM um_expr = unmemoize_expression (expr, env); | |
2440 | ||
7888309b | 2441 | if (scm_is_true (source_properties)) |
9fcf3cbb DH |
2442 | scm_whash_insert (scm_source_whash, um_expr, source_properties); |
2443 | ||
2444 | return um_expr; | |
2445 | } | |
2446 | ||
2447 | SCM | |
2448 | scm_i_unmemocopy_body (SCM forms, SCM env) | |
212e58ed DH |
2449 | { |
2450 | const SCM source_properties = scm_whash_lookup (scm_source_whash, forms); | |
2451 | const SCM um_forms = unmemoize_exprs (forms, env); | |
2452 | ||
7888309b | 2453 | if (scm_is_true (source_properties)) |
212e58ed DH |
2454 | scm_whash_insert (scm_source_whash, um_forms, source_properties); |
2455 | ||
2456 | return um_forms; | |
2457 | } | |
2458 | ||
2459 | ||
434f2f7a | 2460 | #if (SCM_ENABLE_DEPRECATED == 1) |
f58c472a | 2461 | |
434f2f7a DH |
2462 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ |
2463 | SCM | |
2464 | scm_m_expand_body (SCM exprs, SCM env) | |
2465 | { | |
2466 | scm_c_issue_deprecation_warning | |
2467 | ("`scm_m_expand_body' is deprecated."); | |
2468 | m_expand_body (exprs, env); | |
2469 | return exprs; | |
2470 | } | |
f58c472a | 2471 | |
f58c472a DH |
2472 | |
2473 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2474 | ||
2475 | SCM | |
70c1c108 | 2476 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2477 | { |
70c1c108 DH |
2478 | SCM variable; |
2479 | SCM location; | |
2480 | ||
2481 | const SCM cdr_expr = SCM_CDR (expr); | |
2482 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2483 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2484 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2485 | ||
2b189e65 MV |
2486 | scm_c_issue_deprecation_warning |
2487 | ("`undefine' is deprecated.\n"); | |
2488 | ||
70c1c108 | 2489 | variable = SCM_CAR (cdr_expr); |
cc95e00a | 2490 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
70c1c108 | 2491 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); |
7888309b | 2492 | ASSERT_SYNTAX_2 (scm_is_true (location) |
70c1c108 DH |
2493 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), |
2494 | "variable already unbound ", variable, expr); | |
2495 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2496 | return SCM_UNSPECIFIED; |
f58c472a DH |
2497 | } |
2498 | ||
26d5b9b4 MD |
2499 | SCM |
2500 | scm_macroexp (SCM x, SCM env) | |
2501 | { | |
2b189e65 MV |
2502 | scm_c_issue_deprecation_warning |
2503 | ("`scm_macroexp' is deprecated."); | |
2504 | return macroexp (x, env); | |
26d5b9b4 | 2505 | } |
73b64342 | 2506 | |
6f81708a DH |
2507 | #endif |
2508 | ||
60a49842 | 2509 | |
212e58ed | 2510 | #if (SCM_ENABLE_DEPRECATED == 1) |
26d5b9b4 | 2511 | |
212e58ed DH |
2512 | SCM |
2513 | scm_unmemocar (SCM form, SCM env) | |
8ea46249 | 2514 | { |
212e58ed DH |
2515 | scm_c_issue_deprecation_warning |
2516 | ("`scm_unmemocar' is deprecated."); | |
60a49842 | 2517 | |
a61f4e0c | 2518 | if (!scm_is_pair (form)) |
60a49842 DH |
2519 | return form; |
2520 | else | |
2521 | { | |
2522 | SCM c = SCM_CAR (form); | |
2523 | if (SCM_VARIABLEP (c)) | |
2524 | { | |
2525 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
7888309b | 2526 | if (scm_is_false (sym)) |
60a49842 DH |
2527 | sym = sym_three_question_marks; |
2528 | SCM_SETCAR (form, sym); | |
2529 | } | |
2530 | else if (SCM_ILOCP (c)) | |
2531 | { | |
2532 | unsigned long int ir; | |
2533 | ||
2534 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2535 | env = SCM_CDR (env); | |
2536 | env = SCM_CAAR (env); | |
2537 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2538 | env = SCM_CDR (env); | |
f62b9dff | 2539 | |
60a49842 DH |
2540 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2541 | } | |
2542 | return form; | |
2543 | } | |
2544 | } | |
2545 | ||
434f2f7a DH |
2546 | #endif |
2547 | ||
6f81708a DH |
2548 | /*****************************************************************************/ |
2549 | /*****************************************************************************/ | |
2550 | /* The definitions for execution start here. */ | |
2551 | /*****************************************************************************/ | |
2552 | /*****************************************************************************/ | |
2553 | ||
2554 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2555 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2556 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2557 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
7c9c0169 | 2558 | SCM_SYMBOL (sym_instead, "instead"); |
6f81708a DH |
2559 | |
2560 | /* A function object to implement "apply" for non-closure functions. */ | |
2561 | static SCM f_apply; | |
2562 | /* An endless list consisting of #<undefined> objects: */ | |
2563 | static SCM undefineds; | |
2564 | ||
2565 | ||
2566 | int | |
6e8d25a6 | 2567 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2568 | { |
a61f4e0c | 2569 | while (!scm_is_null (formals)) |
0f2d19dd | 2570 | { |
a61f4e0c | 2571 | if (!scm_is_pair (formals)) |
ff467021 | 2572 | return 0; |
a61f4e0c | 2573 | if (scm_is_null (args)) |
ff467021 | 2574 | return 1; |
0f2d19dd JB |
2575 | formals = SCM_CDR (formals); |
2576 | args = SCM_CDR (args); | |
2577 | } | |
a61f4e0c | 2578 | return !scm_is_null (args) ? 1 : 0; |
0f2d19dd | 2579 | } |
a392ee15 | 2580 | |
0f2d19dd | 2581 | \f |
62360b89 | 2582 | |
434f2f7a DH |
2583 | /* The evaluator contains a plethora of EVAL symbols. This is an attempt at |
2584 | * explanation. | |
62360b89 | 2585 | * |
434f2f7a DH |
2586 | * The following macros should be used in code which is read twice (where the |
2587 | * choice of evaluator is hard soldered): | |
62360b89 | 2588 | * |
434f2f7a DH |
2589 | * CEVAL is the symbol used within one evaluator to call itself. |
2590 | * Originally, it is defined to ceval, but is redefined to deval during the | |
2591 | * second pass. | |
62360b89 | 2592 | * |
385609b9 | 2593 | * SCM_I_EVALIM is used when it is known that the expression is an |
62360b89 | 2594 | * immediate. (This macro never calls an evaluator.) |
434f2f7a DH |
2595 | * |
2596 | * EVAL evaluates an expression that is expected to have its symbols already | |
2597 | * memoized. Expressions that are not of the form '(<form> <form> ...)' are | |
2598 | * evaluated inline without calling an evaluator. | |
2599 | * | |
2600 | * EVALCAR evaluates the car of an expression 'X:(Y:<form> <form> ...)', | |
2601 | * potentially replacing a symbol at the position Y:<form> by its memoized | |
2602 | * variable. If Y:<form> is not of the form '(<form> <form> ...)', the | |
2603 | * evaluation is performed inline without calling an evaluator. | |
62360b89 DH |
2604 | * |
2605 | * The following macros should be used in code which is read once | |
2606 | * (where the choice of evaluator is dynamic): | |
2607 | * | |
385609b9 | 2608 | * SCM_I_XEVAL corresponds to EVAL, but uses ceval *or* deval depending on the |
434f2f7a | 2609 | * debugging mode. |
62360b89 | 2610 | * |
385609b9 | 2611 | * SCM_I_XEVALCAR corresponds to EVALCAR, but uses ceval *or* deval depending |
434f2f7a | 2612 | * on the debugging mode. |
62360b89 DH |
2613 | * |
2614 | * The main motivation for keeping this plethora is efficiency | |
2615 | * together with maintainability (=> locality of code). | |
2616 | */ | |
2617 | ||
434f2f7a DH |
2618 | static SCM ceval (SCM x, SCM env); |
2619 | static SCM deval (SCM x, SCM env); | |
2620 | #define CEVAL ceval | |
2621 | ||
62360b89 | 2622 | |
385609b9 | 2623 | #define SCM_I_EVALIM2(x) \ |
bc36d050 | 2624 | ((scm_is_eq ((x), SCM_EOL) \ |
62360b89 DH |
2625 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ |
2626 | : 0), \ | |
2627 | (x)) | |
2628 | ||
385609b9 | 2629 | #define SCM_I_EVALIM(x, env) (SCM_ILOCP (x) \ |
434f2f7a | 2630 | ? *scm_ilookup ((x), (env)) \ |
385609b9 | 2631 | : SCM_I_EVALIM2(x)) |
62360b89 | 2632 | |
385609b9 | 2633 | #define SCM_I_XEVAL(x, env) \ |
434f2f7a | 2634 | (SCM_IMP (x) \ |
385609b9 | 2635 | ? SCM_I_EVALIM2 (x) \ |
434f2f7a DH |
2636 | : (SCM_VARIABLEP (x) \ |
2637 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2638 | : (scm_is_pair (x) \ |
434f2f7a DH |
2639 | ? (scm_debug_mode_p \ |
2640 | ? deval ((x), (env)) \ | |
2641 | : ceval ((x), (env))) \ | |
2642 | : (x)))) | |
2643 | ||
385609b9 | 2644 | #define SCM_I_XEVALCAR(x, env) \ |
434f2f7a | 2645 | (SCM_IMP (SCM_CAR (x)) \ |
385609b9 | 2646 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2647 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2648 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2649 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a DH |
2650 | ? (scm_debug_mode_p \ |
2651 | ? deval (SCM_CAR (x), (env)) \ | |
2652 | : ceval (SCM_CAR (x), (env))) \ | |
cc95e00a | 2653 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2654 | ? SCM_CAR (x) \ |
2655 | : *scm_lookupcar ((x), (env), 1))))) | |
2656 | ||
2657 | #define EVAL(x, env) \ | |
2658 | (SCM_IMP (x) \ | |
385609b9 | 2659 | ? SCM_I_EVALIM ((x), (env)) \ |
434f2f7a DH |
2660 | : (SCM_VARIABLEP (x) \ |
2661 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2662 | : (scm_is_pair (x) \ |
434f2f7a DH |
2663 | ? CEVAL ((x), (env)) \ |
2664 | : (x)))) | |
2665 | ||
2666 | #define EVALCAR(x, env) \ | |
2667 | (SCM_IMP (SCM_CAR (x)) \ | |
385609b9 | 2668 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2669 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2670 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2671 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a | 2672 | ? CEVAL (SCM_CAR (x), (env)) \ |
cc95e00a | 2673 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2674 | ? SCM_CAR (x) \ |
2675 | : *scm_lookupcar ((x), (env), 1))))) | |
62360b89 | 2676 | |
d1138028 | 2677 | scm_i_pthread_mutex_t source_mutex; |
62360b89 DH |
2678 | |
2679 | ||
e5156567 DH |
2680 | /* Lookup a given local variable in an environment. The local variable is |
2681 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
2682 | * indicates the relative number of the environment frame (counting upwards | |
2683 | * from the innermost environment frame), binding indicates the number of the | |
2684 | * binding within the frame, and last? (which is extracted from the iloc using | |
2685 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
2686 | * very end of the improper list of bindings. */ | |
2687 | SCM * | |
2688 | scm_ilookup (SCM iloc, SCM env) | |
2689 | { | |
2690 | unsigned int frame_nr = SCM_IFRAME (iloc); | |
2691 | unsigned int binding_nr = SCM_IDIST (iloc); | |
2692 | SCM frames = env; | |
2693 | SCM bindings; | |
2694 | ||
2695 | for (; 0 != frame_nr; --frame_nr) | |
2696 | frames = SCM_CDR (frames); | |
2697 | ||
2698 | bindings = SCM_CAR (frames); | |
2699 | for (; 0 != binding_nr; --binding_nr) | |
2700 | bindings = SCM_CDR (bindings); | |
2701 | ||
2702 | if (SCM_ICDRP (iloc)) | |
2703 | return SCM_CDRLOC (bindings); | |
2704 | return SCM_CARLOC (SCM_CDR (bindings)); | |
2705 | } | |
2706 | ||
2707 | ||
2708 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
2709 | ||
2710 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
2d0c133f MV |
2711 | static void error_defined_variable (SCM symbol) SCM_NORETURN; |
2712 | ||
2713 | /* Call this for variables that are unfound. | |
2714 | */ | |
e5156567 DH |
2715 | static void |
2716 | error_unbound_variable (SCM symbol) | |
2717 | { | |
2718 | scm_error (scm_unbound_variable_key, NULL, | |
2719 | "Unbound variable: ~S", | |
2720 | scm_list_1 (symbol), SCM_BOOL_F); | |
2721 | } | |
2722 | ||
2d0c133f MV |
2723 | /* Call this for variables that are found but contain SCM_UNDEFINED. |
2724 | */ | |
2725 | static void | |
2726 | error_defined_variable (SCM symbol) | |
2727 | { | |
2728 | /* We use the 'unbound-variable' key here as well, since it | |
2729 | basically is the same kind of error, with a slight variation in | |
2730 | the displayed message. | |
2731 | */ | |
2732 | scm_error (scm_unbound_variable_key, NULL, | |
a03bad87 | 2733 | "Variable used before given a value: ~S", |
2d0c133f MV |
2734 | scm_list_1 (symbol), SCM_BOOL_F); |
2735 | } | |
2736 | ||
e5156567 DH |
2737 | |
2738 | /* The Lookup Car Race | |
2739 | - by Eva Luator | |
2740 | ||
2741 | Memoization of variables and special forms is done while executing | |
2742 | the code for the first time. As long as there is only one thread | |
2743 | everything is fine, but as soon as two threads execute the same | |
2744 | code concurrently `for the first time' they can come into conflict. | |
2745 | ||
2746 | This memoization includes rewriting variable references into more | |
2747 | efficient forms and expanding macros. Furthermore, macro expansion | |
2748 | includes `compiling' special forms like `let', `cond', etc. into | |
2749 | tree-code instructions. | |
2750 | ||
2751 | There shouldn't normally be a problem with memoizing local and | |
2752 | global variable references (into ilocs and variables), because all | |
2753 | threads will mutate the code in *exactly* the same way and (if I | |
2754 | read the C code correctly) it is not possible to observe a half-way | |
2755 | mutated cons cell. The lookup procedure can handle this | |
2756 | transparently without any critical sections. | |
2757 | ||
2758 | It is different with macro expansion, because macro expansion | |
2759 | happens outside of the lookup procedure and can't be | |
2760 | undone. Therefore the lookup procedure can't cope with it. It has | |
2761 | to indicate failure when it detects a lost race and hope that the | |
2762 | caller can handle it. Luckily, it turns out that this is the case. | |
2763 | ||
2764 | An example to illustrate this: Suppose that the following form will | |
2765 | be memoized concurrently by two threads | |
2766 | ||
2767 | (let ((x 12)) x) | |
2768 | ||
2769 | Let's first examine the lookup of X in the body. The first thread | |
2770 | decides that it has to find the symbol "x" in the environment and | |
2771 | starts to scan it. Then the other thread takes over and actually | |
2772 | overtakes the first. It looks up "x" and substitutes an | |
2773 | appropriate iloc for it. Now the first thread continues and | |
2774 | completes its lookup. It comes to exactly the same conclusions as | |
2775 | the second one and could - without much ado - just overwrite the | |
2776 | iloc with the same iloc. | |
2777 | ||
2778 | But let's see what will happen when the race occurs while looking | |
2779 | up the symbol "let" at the start of the form. It could happen that | |
2780 | the second thread interrupts the lookup of the first thread and not | |
2781 | only substitutes a variable for it but goes right ahead and | |
2782 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
2783 | the first thread completes its lookup, it would replace the #@let* | |
2784 | with a variable containing the "let" binding, effectively reverting | |
2785 | the form to (let (x 12) x). This is wrong. It has to detect that | |
2786 | it has lost the race and the evaluator has to reconsider the | |
2787 | changed form completely. | |
2788 | ||
2789 | This race condition could be resolved with some kind of traffic | |
2790 | light (like mutexes) around scm_lookupcar, but I think that it is | |
2791 | best to avoid them in this case. They would serialize memoization | |
2792 | completely and because lookup involves calling arbitrary Scheme | |
2793 | code (via the lookup-thunk), threads could be blocked for an | |
2794 | arbitrary amount of time or even deadlock. But with the current | |
2795 | solution a lot of unnecessary work is potentially done. */ | |
2796 | ||
2797 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to | |
2798 | return NULL to indicate a failed lookup due to some race conditions | |
2799 | between threads. This only happens when VLOC is the first cell of | |
2800 | a special form that will eventually be memoized (like `let', etc.) | |
2801 | In that case the whole lookup is bogus and the caller has to | |
2802 | reconsider the complete special form. | |
2803 | ||
2804 | SCM_LOOKUPCAR is still there, of course. It just calls | |
2805 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR | |
2806 | should only be called when it is known that VLOC is not the first | |
2807 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
2808 | for NULL. I think I've found the only places where this | |
2809 | applies. */ | |
2810 | ||
2811 | static SCM * | |
2812 | scm_lookupcar1 (SCM vloc, SCM genv, int check) | |
2813 | { | |
2814 | SCM env = genv; | |
2815 | register SCM *al, fl, var = SCM_CAR (vloc); | |
2816 | register SCM iloc = SCM_ILOC00; | |
2817 | for (; SCM_NIMP (env); env = SCM_CDR (env)) | |
2818 | { | |
a61f4e0c | 2819 | if (!scm_is_pair (SCM_CAR (env))) |
e5156567 DH |
2820 | break; |
2821 | al = SCM_CARLOC (env); | |
2822 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) | |
2823 | { | |
a61f4e0c | 2824 | if (!scm_is_pair (fl)) |
e5156567 | 2825 | { |
bc36d050 | 2826 | if (scm_is_eq (fl, var)) |
e5156567 | 2827 | { |
bc36d050 | 2828 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2829 | goto race; |
2830 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); | |
2831 | return SCM_CDRLOC (*al); | |
2832 | } | |
2833 | else | |
2834 | break; | |
2835 | } | |
2836 | al = SCM_CDRLOC (*al); | |
bc36d050 | 2837 | if (scm_is_eq (SCM_CAR (fl), var)) |
e5156567 DH |
2838 | { |
2839 | if (SCM_UNBNDP (SCM_CAR (*al))) | |
2d0c133f | 2840 | error_defined_variable (var); |
bc36d050 | 2841 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2842 | goto race; |
2843 | SCM_SETCAR (vloc, iloc); | |
2844 | return SCM_CARLOC (*al); | |
2845 | } | |
2846 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); | |
2847 | } | |
2848 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); | |
2849 | } | |
2850 | { | |
2851 | SCM top_thunk, real_var; | |
2852 | if (SCM_NIMP (env)) | |
2853 | { | |
2854 | top_thunk = SCM_CAR (env); /* env now refers to a | |
2855 | top level env thunk */ | |
2856 | env = SCM_CDR (env); | |
2857 | } | |
2858 | else | |
2859 | top_thunk = SCM_BOOL_F; | |
2860 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); | |
7888309b | 2861 | if (scm_is_false (real_var)) |
e5156567 DH |
2862 | goto errout; |
2863 | ||
a61f4e0c | 2864 | if (!scm_is_null (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
e5156567 DH |
2865 | { |
2866 | errout: | |
2867 | if (check) | |
2868 | { | |
a61f4e0c | 2869 | if (scm_is_null (env)) |
e5156567 DH |
2870 | error_unbound_variable (var); |
2871 | else | |
2872 | scm_misc_error (NULL, "Damaged environment: ~S", | |
2873 | scm_list_1 (var)); | |
2874 | } | |
2875 | else | |
2876 | { | |
2877 | /* A variable could not be found, but we shall | |
2878 | not throw an error. */ | |
2879 | static SCM undef_object = SCM_UNDEFINED; | |
2880 | return &undef_object; | |
2881 | } | |
2882 | } | |
2883 | ||
bc36d050 | 2884 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2885 | { |
2886 | /* Some other thread has changed the very cell we are working | |
2887 | on. In effect, it must have done our job or messed it up | |
2888 | completely. */ | |
2889 | race: | |
2890 | var = SCM_CAR (vloc); | |
2891 | if (SCM_VARIABLEP (var)) | |
2892 | return SCM_VARIABLE_LOC (var); | |
2893 | if (SCM_ILOCP (var)) | |
2894 | return scm_ilookup (var, genv); | |
2895 | /* We can't cope with anything else than variables and ilocs. When | |
2896 | a special form has been memoized (i.e. `let' into `#@let') we | |
2897 | return NULL and expect the calling function to do the right | |
2898 | thing. For the evaluator, this means going back and redoing | |
2899 | the dispatch on the car of the form. */ | |
2900 | return NULL; | |
2901 | } | |
2902 | ||
2903 | SCM_SETCAR (vloc, real_var); | |
2904 | return SCM_VARIABLE_LOC (real_var); | |
2905 | } | |
2906 | } | |
2907 | ||
2908 | SCM * | |
2909 | scm_lookupcar (SCM vloc, SCM genv, int check) | |
2910 | { | |
2911 | SCM *loc = scm_lookupcar1 (vloc, genv, check); | |
2912 | if (loc == NULL) | |
2913 | abort (); | |
2914 | return loc; | |
2915 | } | |
2916 | ||
2917 | ||
36245b66 DH |
2918 | /* During execution, look up a symbol in the top level of the given local |
2919 | * environment and return the corresponding variable object. If no binding | |
2920 | * for the symbol can be found, an 'Unbound variable' error is signalled. */ | |
2921 | static SCM | |
2922 | lazy_memoize_variable (const SCM symbol, const SCM environment) | |
2923 | { | |
2924 | const SCM top_level = scm_env_top_level (environment); | |
2925 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
2926 | ||
7888309b | 2927 | if (scm_is_false (variable)) |
36245b66 DH |
2928 | error_unbound_variable (symbol); |
2929 | else | |
2930 | return variable; | |
2931 | } | |
2932 | ||
2933 | ||
62360b89 DH |
2934 | SCM |
2935 | scm_eval_car (SCM pair, SCM env) | |
2936 | { | |
385609b9 | 2937 | return SCM_I_XEVALCAR (pair, env); |
62360b89 DH |
2938 | } |
2939 | ||
2940 | ||
6dbd0af5 | 2941 | SCM |
6e8d25a6 | 2942 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2943 | { |
680ed4a8 | 2944 | SCM results = SCM_EOL, *lloc = &results, res; |
a61f4e0c | 2945 | while (scm_is_pair (l)) |
6dbd0af5 | 2946 | { |
680ed4a8 | 2947 | res = EVALCAR (l, env); |
904a077d | 2948 | |
8ea46249 | 2949 | *lloc = scm_list_1 (res); |
a23afe53 | 2950 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2951 | l = SCM_CDR (l); |
2952 | } | |
a61f4e0c | 2953 | if (!scm_is_null (l)) |
904a077d | 2954 | scm_wrong_num_args (proc); |
680ed4a8 | 2955 | return results; |
6dbd0af5 | 2956 | } |
c4ac4d88 | 2957 | |
d0b07b5d | 2958 | |
9de33deb MD |
2959 | SCM |
2960 | scm_eval_body (SCM code, SCM env) | |
2961 | { | |
2962 | SCM next; | |
434f2f7a | 2963 | |
9de33deb | 2964 | again: |
01f11e02 | 2965 | next = SCM_CDR (code); |
a61f4e0c | 2966 | while (!scm_is_null (next)) |
9de33deb MD |
2967 | { |
2968 | if (SCM_IMP (SCM_CAR (code))) | |
2969 | { | |
2970 | if (SCM_ISYMP (SCM_CAR (code))) | |
2971 | { | |
9de87eea | 2972 | scm_i_scm_pthread_mutex_lock (&source_mutex); |
9bc4701c MD |
2973 | /* check for race condition */ |
2974 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2975 | m_expand_body (code, env); |
9de87eea | 2976 | scm_i_pthread_mutex_unlock (&source_mutex); |
9de33deb MD |
2977 | goto again; |
2978 | } | |
2979 | } | |
2980 | else | |
385609b9 | 2981 | SCM_I_XEVAL (SCM_CAR (code), env); |
9de33deb | 2982 | code = next; |
01f11e02 | 2983 | next = SCM_CDR (code); |
9de33deb | 2984 | } |
385609b9 | 2985 | return SCM_I_XEVALCAR (code, env); |
9de33deb MD |
2986 | } |
2987 | ||
0f2d19dd JB |
2988 | #endif /* !DEVAL */ |
2989 | ||
6dbd0af5 MD |
2990 | |
2991 | /* SECTION: This code is specific for the debugging support. One | |
2992 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2993 | * defined. | |
2994 | */ | |
2995 | ||
2996 | #ifndef DEVAL | |
2997 | ||
2998 | #define SCM_APPLY scm_apply | |
2999 | #define PREP_APPLY(proc, args) | |
3000 | #define ENTER_APPLY | |
ddea3325 | 3001 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
3002 | #ifdef STACK_CHECKING |
3003 | #ifndef NO_CEVAL_STACK_CHECKING | |
3004 | #define EVAL_STACK_CHECKING | |
3005 | #endif | |
6dbd0af5 MD |
3006 | #endif |
3007 | ||
3008 | #else /* !DEVAL */ | |
3009 | ||
434f2f7a DH |
3010 | #undef CEVAL |
3011 | #define CEVAL deval /* Substitute all uses of ceval */ | |
3012 | ||
0f2d19dd JB |
3013 | #undef SCM_APPLY |
3014 | #define SCM_APPLY scm_dapply | |
434f2f7a | 3015 | |
6dbd0af5 MD |
3016 | #undef PREP_APPLY |
3017 | #define PREP_APPLY(p, l) \ | |
3018 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
434f2f7a | 3019 | |
6dbd0af5 MD |
3020 | #undef ENTER_APPLY |
3021 | #define ENTER_APPLY \ | |
d3a6bc94 | 3022 | do { \ |
b7ff98dd | 3023 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 3024 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 3025 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 3026 | {\ |
7888309b | 3027 | SCM tmp, tail = scm_from_bool(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 3028 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 3029 | SCM_TRAPS_P = 0;\ |
7c9c0169 NJ |
3030 | tmp = scm_make_debugobj (&debug);\ |
3031 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ | |
d95c0b76 | 3032 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 3033 | }\ |
d3a6bc94 | 3034 | } while (0) |
434f2f7a | 3035 | |
0f2d19dd | 3036 | #undef RETURN |
ddea3325 | 3037 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
434f2f7a | 3038 | |
b7ff98dd MD |
3039 | #ifdef STACK_CHECKING |
3040 | #ifndef EVAL_STACK_CHECKING | |
3041 | #define EVAL_STACK_CHECKING | |
3042 | #endif | |
6dbd0af5 MD |
3043 | #endif |
3044 | ||
0f2d19dd | 3045 | |
434f2f7a DH |
3046 | /* scm_last_debug_frame contains a pointer to the last debugging information |
3047 | * stack frame. It is accessed very often from the debugging evaluator, so it | |
3048 | * should probably not be indirectly addressed. Better to save and restore it | |
3049 | * from the current root at any stack swaps. | |
6dbd0af5 MD |
3050 | */ |
3051 | ||
6dbd0af5 MD |
3052 | /* scm_debug_eframe_size is the number of slots available for pseudo |
3053 | * stack frames at each real stack frame. | |
3054 | */ | |
3055 | ||
c014a02e | 3056 | long scm_debug_eframe_size; |
6dbd0af5 | 3057 | |
434f2f7a DH |
3058 | int scm_debug_mode_p; |
3059 | int scm_check_entry_p; | |
3060 | int scm_check_apply_p; | |
3061 | int scm_check_exit_p; | |
6dbd0af5 | 3062 | |
c014a02e | 3063 | long scm_eval_stack; |
a74145b8 | 3064 | |
92c2555f | 3065 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 3066 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
3067 | }; |
3068 | ||
92c2555f | 3069 | scm_t_option scm_debug_opts[] = { |
b7ff98dd | 3070 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
7c9c0169 | 3071 | "*This option is now obsolete. Setting it has no effect." }, |
b7ff98dd MD |
3072 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, |
3073 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
3074 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
3075 | "Record procedure names at definition." }, | |
3076 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
3077 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 3078 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
3079 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
3080 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 3081 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
3082 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
3083 | "Maximal number of stored backtrace frames." }, | |
3084 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
3085 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
3086 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 3087 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
65bc1f7a MV |
3088 | { 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."}, |
3089 | { SCM_OPTION_BOOLEAN, "warn-deprecated", 0, "Warn when deprecated features are used." } | |
6dbd0af5 MD |
3090 | }; |
3091 | ||
92c2555f | 3092 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 3093 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
3094 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
3095 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
3096 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
3097 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
3098 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
3099 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
3100 | }; |
3101 | ||
a1ec6916 | 3102 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 3103 | (SCM setting), |
b3f26b14 MG |
3104 | "Option interface for the evaluation options. Instead of using\n" |
3105 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 3106 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 3107 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
3108 | { |
3109 | SCM ans; | |
876099d4 | 3110 | |
661ae7ab MV |
3111 | scm_dynwind_begin (0); |
3112 | scm_dynwind_critical_section (SCM_BOOL_F); | |
33b97402 MD |
3113 | ans = scm_options (setting, |
3114 | scm_eval_opts, | |
3115 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 3116 | FUNC_NAME); |
a74145b8 | 3117 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
661ae7ab | 3118 | scm_dynwind_end (); |
876099d4 | 3119 | |
33b97402 MD |
3120 | return ans; |
3121 | } | |
1bbd0b84 | 3122 | #undef FUNC_NAME |
33b97402 | 3123 | |
d0b07b5d | 3124 | |
a1ec6916 | 3125 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 3126 | (SCM setting), |
b3f26b14 | 3127 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 3128 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
3129 | { |
3130 | SCM ans; | |
9de87eea | 3131 | SCM_CRITICAL_SECTION_START; |
33b97402 MD |
3132 | ans = scm_options (setting, |
3133 | scm_evaluator_trap_table, | |
3134 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 3135 | FUNC_NAME); |
2b0fb0a5 | 3136 | /* njrev: same again. */ |
33b97402 | 3137 | SCM_RESET_DEBUG_MODE; |
9de87eea | 3138 | SCM_CRITICAL_SECTION_END; |
33b97402 MD |
3139 | return ans; |
3140 | } | |
1bbd0b84 | 3141 | #undef FUNC_NAME |
33b97402 | 3142 | |
d0b07b5d | 3143 | |
24933780 | 3144 | static SCM |
a392ee15 | 3145 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 3146 | { |
b1cb24ff | 3147 | SCM *results = lloc; |
a61f4e0c | 3148 | while (scm_is_pair (l)) |
0f2d19dd | 3149 | { |
b1cb24ff | 3150 | const SCM res = EVALCAR (l, env); |
904a077d | 3151 | |
8ea46249 | 3152 | *lloc = scm_list_1 (res); |
a23afe53 | 3153 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
3154 | l = SCM_CDR (l); |
3155 | } | |
a61f4e0c | 3156 | if (!scm_is_null (l)) |
904a077d | 3157 | scm_wrong_num_args (proc); |
680ed4a8 | 3158 | return *results; |
0f2d19dd JB |
3159 | } |
3160 | ||
5defc05d NJ |
3161 | static void |
3162 | eval_letrec_inits (SCM env, SCM init_forms, SCM **init_values_eol) | |
3163 | { | |
3164 | SCM argv[10]; | |
3165 | int i = 0, imax = sizeof (argv) / sizeof (SCM); | |
3166 | ||
3167 | while (!scm_is_null (init_forms)) | |
3168 | { | |
3169 | if (imax == i) | |
3170 | { | |
3171 | eval_letrec_inits (env, init_forms, init_values_eol); | |
3172 | break; | |
3173 | } | |
3174 | argv[i++] = EVALCAR (init_forms, env); | |
3175 | init_forms = SCM_CDR (init_forms); | |
3176 | } | |
3177 | ||
3178 | for (i--; i >= 0; i--) | |
3179 | { | |
3180 | **init_values_eol = scm_list_1 (argv[i]); | |
3181 | *init_values_eol = SCM_CDRLOC (**init_values_eol); | |
3182 | } | |
3183 | } | |
3184 | ||
6dbd0af5 MD |
3185 | #endif /* !DEVAL */ |
3186 | ||
3187 | ||
a392ee15 | 3188 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
3189 | */ |
3190 | ||
a392ee15 | 3191 | |
d9d39d76 | 3192 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 3193 | * current module. */ |
d9d39d76 MV |
3194 | #define UPDATE_TOPLEVEL_ENV(env) \ |
3195 | do { \ | |
3196 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 3197 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
3198 | env = scm_top_level_env (p); \ |
3199 | } while (0) | |
3200 | ||
6dbd0af5 | 3201 | |
6f81708a | 3202 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
bc36d050 | 3203 | ASSERT_SYNTAX (!scm_is_eq ((x), SCM_EOL), s_empty_combination, x) |
6f81708a DH |
3204 | |
3205 | ||
a392ee15 DH |
3206 | /* This is the evaluator. Like any real monster, it has three heads: |
3207 | * | |
434f2f7a DH |
3208 | * ceval is the non-debugging evaluator, deval is the debugging version. Both |
3209 | * are implemented using a common code base, using the following mechanism: | |
3210 | * CEVAL is a macro, which is either defined to ceval or deval. Thus, there | |
3211 | * is no function CEVAL, but the code for CEVAL actually compiles to either | |
3212 | * ceval or deval. When CEVAL is defined to ceval, it is known that the macro | |
3213 | * DEVAL is not defined. When CEVAL is defined to deval, then the macro DEVAL | |
3214 | * is known to be defined. Thus, in CEVAL parts for the debugging evaluator | |
a392ee15 DH |
3215 | * are enclosed within #ifdef DEVAL ... #endif. |
3216 | * | |
434f2f7a DH |
3217 | * All three (ceval, deval and their common implementation CEVAL) take two |
3218 | * input parameters, x and env: x is a single expression to be evalutated. | |
3219 | * env is the environment in which bindings are searched. | |
a392ee15 | 3220 | * |
434f2f7a DH |
3221 | * x is known to be a pair. Since x is a single expression, it is necessarily |
3222 | * in a tail position. If x is just a call to another function like in the | |
3223 | * expression (foo exp1 exp2 ...), the realization of that call therefore | |
3224 | * _must_not_ increase stack usage (the evaluation of exp1, exp2 etc., | |
3225 | * however, may do so). This is realized by making extensive use of 'goto' | |
3226 | * statements within the evaluator: The gotos replace recursive calls to | |
3227 | * CEVAL, thus re-using the same stack frame that CEVAL was already using. | |
3228 | * If, however, x represents some form that requires to evaluate a sequence of | |
3229 | * expressions like (begin exp1 exp2 ...), then recursive calls to CEVAL are | |
3230 | * performed for all but the last expression of that sequence. */ | |
6dbd0af5 | 3231 | |
434f2f7a DH |
3232 | static SCM |
3233 | CEVAL (SCM x, SCM env) | |
0f2d19dd | 3234 | { |
42030fb2 | 3235 | SCM proc, arg1; |
6dbd0af5 | 3236 | #ifdef DEVAL |
92c2555f MV |
3237 | scm_t_debug_frame debug; |
3238 | scm_t_debug_info *debug_info_end; | |
9de87eea | 3239 | debug.prev = scm_i_last_debug_frame (); |
020c890c | 3240 | debug.status = 0; |
04b6c081 | 3241 | /* |
92c2555f | 3242 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
3243 | * user has specified with (debug-set! frames <n>). |
3244 | * | |
3245 | * Even frames are eval frames, odd frames are apply frames. | |
3246 | */ | |
92c2555f | 3247 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 3248 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
3249 | debug.info = debug.vect; |
3250 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
9de87eea | 3251 | scm_i_set_last_debug_frame (&debug); |
6dbd0af5 | 3252 | #endif |
b7ff98dd | 3253 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 3254 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 3255 | { |
b7ff98dd | 3256 | #ifdef DEVAL |
6dbd0af5 MD |
3257 | debug.info->e.exp = x; |
3258 | debug.info->e.env = env; | |
b7ff98dd | 3259 | #endif |
6dbd0af5 MD |
3260 | scm_report_stack_overflow (); |
3261 | } | |
3262 | #endif | |
6a0f6ff3 | 3263 | |
6dbd0af5 MD |
3264 | #ifdef DEVAL |
3265 | goto start; | |
3266 | #endif | |
6a0f6ff3 | 3267 | |
6dbd0af5 MD |
3268 | loop: |
3269 | #ifdef DEVAL | |
b7ff98dd MD |
3270 | SCM_CLEAR_ARGSREADY (debug); |
3271 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 3272 | --debug.info; |
04b6c081 MD |
3273 | /* |
3274 | * In theory, this should be the only place where it is necessary to | |
3275 | * check for space in debug.vect since both eval frames and | |
3276 | * available space are even. | |
3277 | * | |
3278 | * For this to be the case, however, it is necessary that primitive | |
3279 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 3280 | * label call PREP_APPLY. |
04b6c081 | 3281 | */ |
c0ab1b8d | 3282 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 3283 | { |
b7ff98dd | 3284 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
3285 | debug.info -= 2; |
3286 | } | |
6a0f6ff3 | 3287 | |
6dbd0af5 MD |
3288 | start: |
3289 | debug.info->e.exp = x; | |
3290 | debug.info->e.env = env; | |
5132eef0 DH |
3291 | if (scm_check_entry_p && SCM_TRAPS_P) |
3292 | { | |
bc76d628 DH |
3293 | if (SCM_ENTER_FRAME_P |
3294 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 3295 | { |
bc76d628 | 3296 | SCM stackrep; |
7888309b | 3297 | SCM tail = scm_from_bool (SCM_TAILRECP (debug)); |
5132eef0 | 3298 | SCM_SET_TAILREC (debug); |
7c9c0169 | 3299 | stackrep = scm_make_debugobj (&debug); |
5132eef0 | 3300 | SCM_TRAPS_P = 0; |
7c9c0169 NJ |
3301 | stackrep = scm_call_4 (SCM_ENTER_FRAME_HDLR, |
3302 | scm_sym_enter_frame, | |
3303 | stackrep, | |
3304 | tail, | |
3305 | unmemoize_expression (x, env)); | |
5132eef0 | 3306 | SCM_TRAPS_P = 1; |
7c9c0169 NJ |
3307 | if (scm_is_pair (stackrep) && |
3308 | scm_is_eq (SCM_CAR (stackrep), sym_instead)) | |
3309 | { | |
3310 | /* This gives the possibility for the debugger to modify | |
3311 | the source expression before evaluation. */ | |
3312 | x = SCM_CDR (stackrep); | |
3313 | if (SCM_IMP (x)) | |
3314 | RETURN (x); | |
3315 | } | |
5132eef0 DH |
3316 | } |
3317 | } | |
6dbd0af5 | 3318 | #endif |
f8769b1d | 3319 | dispatch: |
9cb5124f | 3320 | SCM_TICK; |
dec40cd2 | 3321 | if (SCM_ISYMP (SCM_CAR (x))) |
0f2d19dd | 3322 | { |
7e6e6b37 | 3323 | switch (ISYMNUM (SCM_CAR (x))) |
dec40cd2 | 3324 | { |
7e6e6b37 | 3325 | case (ISYMNUM (SCM_IM_AND)): |
dec40cd2 | 3326 | x = SCM_CDR (x); |
a61f4e0c | 3327 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3328 | { |
3329 | SCM test_result = EVALCAR (x, env); | |
7888309b | 3330 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3331 | RETURN (SCM_BOOL_F); |
3332 | else | |
3333 | x = SCM_CDR (x); | |
3334 | } | |
3335 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3336 | goto carloop; | |
0f2d19dd | 3337 | |
7e6e6b37 | 3338 | case (ISYMNUM (SCM_IM_BEGIN)): |
dec40cd2 | 3339 | x = SCM_CDR (x); |
a61f4e0c | 3340 | if (scm_is_null (x)) |
dec40cd2 | 3341 | RETURN (SCM_UNSPECIFIED); |
b8113bc8 | 3342 | |
dec40cd2 | 3343 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd | 3344 | |
dec40cd2 DH |
3345 | begin: |
3346 | /* If we are on toplevel with a lookup closure, we need to sync | |
3347 | with the current module. */ | |
a61f4e0c | 3348 | if (scm_is_pair (env) && !scm_is_pair (SCM_CAR (env))) |
dec40cd2 DH |
3349 | { |
3350 | UPDATE_TOPLEVEL_ENV (env); | |
a61f4e0c | 3351 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3352 | { |
3353 | EVALCAR (x, env); | |
3354 | UPDATE_TOPLEVEL_ENV (env); | |
3355 | x = SCM_CDR (x); | |
3356 | } | |
3357 | goto carloop; | |
3358 | } | |
3359 | else | |
3360 | goto nontoplevel_begin; | |
5280aaca | 3361 | |
dec40cd2 | 3362 | nontoplevel_begin: |
a61f4e0c | 3363 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 | 3364 | { |
b1cb24ff | 3365 | const SCM form = SCM_CAR (x); |
dec40cd2 DH |
3366 | if (SCM_IMP (form)) |
3367 | { | |
3368 | if (SCM_ISYMP (form)) | |
3369 | { | |
9de87eea | 3370 | scm_i_scm_pthread_mutex_lock (&source_mutex); |
dec40cd2 DH |
3371 | /* check for race condition */ |
3372 | if (SCM_ISYMP (SCM_CAR (x))) | |
3373 | m_expand_body (x, env); | |
9de87eea | 3374 | scm_i_pthread_mutex_unlock (&source_mutex); |
dec40cd2 DH |
3375 | goto nontoplevel_begin; |
3376 | } | |
3377 | else | |
3378 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); | |
3379 | } | |
3380 | else | |
b1cb24ff | 3381 | (void) EVAL (form, env); |
dec40cd2 DH |
3382 | x = SCM_CDR (x); |
3383 | } | |
b1cb24ff | 3384 | |
dec40cd2 DH |
3385 | carloop: |
3386 | { | |
3387 | /* scm_eval last form in list */ | |
b1cb24ff | 3388 | const SCM last_form = SCM_CAR (x); |
0f2d19dd | 3389 | |
a61f4e0c | 3390 | if (scm_is_pair (last_form)) |
dec40cd2 DH |
3391 | { |
3392 | /* This is by far the most frequent case. */ | |
3393 | x = last_form; | |
3394 | goto loop; /* tail recurse */ | |
3395 | } | |
3396 | else if (SCM_IMP (last_form)) | |
385609b9 | 3397 | RETURN (SCM_I_EVALIM (last_form, env)); |
dec40cd2 DH |
3398 | else if (SCM_VARIABLEP (last_form)) |
3399 | RETURN (SCM_VARIABLE_REF (last_form)); | |
cc95e00a | 3400 | else if (scm_is_symbol (last_form)) |
dec40cd2 DH |
3401 | RETURN (*scm_lookupcar (x, env, 1)); |
3402 | else | |
3403 | RETURN (last_form); | |
3404 | } | |
0f2d19dd JB |
3405 | |
3406 | ||
7e6e6b37 | 3407 | case (ISYMNUM (SCM_IM_CASE)): |
dec40cd2 DH |
3408 | x = SCM_CDR (x); |
3409 | { | |
b1cb24ff | 3410 | const SCM key = EVALCAR (x, env); |
dec40cd2 | 3411 | x = SCM_CDR (x); |
a61f4e0c | 3412 | while (!scm_is_null (x)) |
dec40cd2 | 3413 | { |
b1cb24ff | 3414 | const SCM clause = SCM_CAR (x); |
dec40cd2 | 3415 | SCM labels = SCM_CAR (clause); |
bc36d050 | 3416 | if (scm_is_eq (labels, SCM_IM_ELSE)) |
dec40cd2 DH |
3417 | { |
3418 | x = SCM_CDR (clause); | |
3419 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3420 | goto begin; | |
3421 | } | |
a61f4e0c | 3422 | while (!scm_is_null (labels)) |
dec40cd2 | 3423 | { |
b1cb24ff | 3424 | const SCM label = SCM_CAR (labels); |
bc36d050 | 3425 | if (scm_is_eq (label, key) |
7888309b | 3426 | || scm_is_true (scm_eqv_p (label, key))) |
dec40cd2 DH |
3427 | { |
3428 | x = SCM_CDR (clause); | |
3429 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3430 | goto begin; | |
3431 | } | |
3432 | labels = SCM_CDR (labels); | |
3433 | } | |
3434 | x = SCM_CDR (x); | |
3435 | } | |
3436 | } | |
3437 | RETURN (SCM_UNSPECIFIED); | |
0f2d19dd JB |
3438 | |
3439 | ||
7e6e6b37 | 3440 | case (ISYMNUM (SCM_IM_COND)): |
dec40cd2 | 3441 | x = SCM_CDR (x); |
a61f4e0c | 3442 | while (!scm_is_null (x)) |
dec40cd2 | 3443 | { |
b1cb24ff | 3444 | const SCM clause = SCM_CAR (x); |
bc36d050 | 3445 | if (scm_is_eq (SCM_CAR (clause), SCM_IM_ELSE)) |
dec40cd2 DH |
3446 | { |
3447 | x = SCM_CDR (clause); | |
3448 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3449 | goto begin; | |
3450 | } | |
3451 | else | |
3452 | { | |
3453 | arg1 = EVALCAR (clause, env); | |
1fe1fc0a MV |
3454 | /* SRFI 61 extended cond */ |
3455 | if (!scm_is_null (SCM_CDR (clause)) | |
3456 | && !scm_is_null (SCM_CDDR (clause)) | |
3457 | && scm_is_eq (SCM_CADDR (clause), SCM_IM_ARROW)) | |
3458 | { | |
3459 | SCM xx, guard_result; | |
3460 | if (SCM_VALUESP (arg1)) | |
3461 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3462 | else | |
3463 | arg1 = scm_list_1 (arg1); | |
3464 | xx = SCM_CDR (clause); | |
3465 | proc = EVALCAR (xx, env); | |
3466 | guard_result = SCM_APPLY (proc, arg1, SCM_EOL); | |
3467 | if (scm_is_true (guard_result) | |
3468 | && !SCM_NILP (guard_result)) | |
3469 | { | |
3470 | proc = SCM_CDDR (xx); | |
3471 | proc = EVALCAR (proc, env); | |
3472 | PREP_APPLY (proc, arg1); | |
3473 | goto apply_proc; | |
3474 | } | |
3475 | } | |
3476 | else if (scm_is_true (arg1) && !SCM_NILP (arg1)) | |
dec40cd2 DH |
3477 | { |
3478 | x = SCM_CDR (clause); | |
a61f4e0c | 3479 | if (scm_is_null (x)) |
dec40cd2 | 3480 | RETURN (arg1); |
bc36d050 | 3481 | else if (!scm_is_eq (SCM_CAR (x), SCM_IM_ARROW)) |
dec40cd2 DH |
3482 | { |
3483 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3484 | goto begin; | |
3485 | } | |
3486 | else | |
3487 | { | |
3488 | proc = SCM_CDR (x); | |
3489 | proc = EVALCAR (proc, env); | |
3490 | PREP_APPLY (proc, scm_list_1 (arg1)); | |
3491 | ENTER_APPLY; | |
3492 | goto evap1; | |
3493 | } | |
3494 | } | |
3495 | x = SCM_CDR (x); | |
3496 | } | |
3497 | } | |
3498 | RETURN (SCM_UNSPECIFIED); | |
e5cb71a0 | 3499 | |
e5cb71a0 | 3500 | |
7e6e6b37 | 3501 | case (ISYMNUM (SCM_IM_DO)): |
dec40cd2 DH |
3502 | x = SCM_CDR (x); |
3503 | { | |
3504 | /* Compute the initialization values and the initial environment. */ | |
3505 | SCM init_forms = SCM_CAR (x); | |
3506 | SCM init_values = SCM_EOL; | |
a61f4e0c | 3507 | while (!scm_is_null (init_forms)) |
dec40cd2 DH |
3508 | { |
3509 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3510 | init_forms = SCM_CDR (init_forms); | |
3511 | } | |
3512 | x = SCM_CDR (x); | |
3513 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3514 | } | |
3515 | x = SCM_CDR (x); | |
3516 | { | |
3517 | SCM test_form = SCM_CAR (x); | |
3518 | SCM body_forms = SCM_CADR (x); | |
3519 | SCM step_forms = SCM_CDDR (x); | |
e5cb71a0 | 3520 | |
dec40cd2 | 3521 | SCM test_result = EVALCAR (test_form, env); |
e5cb71a0 | 3522 | |
7888309b | 3523 | while (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3524 | { |
3525 | { | |
3526 | /* Evaluate body forms. */ | |
3527 | SCM temp_forms; | |
3528 | for (temp_forms = body_forms; | |
a61f4e0c | 3529 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3530 | temp_forms = SCM_CDR (temp_forms)) |
3531 | { | |
3532 | SCM form = SCM_CAR (temp_forms); | |
b1cb24ff DH |
3533 | /* Dirk:FIXME: We only need to eval forms that may have |
3534 | * a side effect here. This is only true for forms that | |
3535 | * start with a pair. All others are just constants. | |
3536 | * Since with the current memoizer 'form' may hold a | |
3537 | * constant, we call EVAL here to handle the constant | |
3538 | * cases. In the long run it would make sense to have | |
3539 | * the macro transformer of 'do' eliminate all forms | |
3540 | * that have no sideeffect. Then instead of EVAL we | |
3541 | * could call CEVAL directly here. */ | |
3542 | (void) EVAL (form, env); | |
dec40cd2 DH |
3543 | } |
3544 | } | |
0f2d19dd | 3545 | |
dec40cd2 DH |
3546 | { |
3547 | /* Evaluate the step expressions. */ | |
3548 | SCM temp_forms; | |
3549 | SCM step_values = SCM_EOL; | |
3550 | for (temp_forms = step_forms; | |
a61f4e0c | 3551 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3552 | temp_forms = SCM_CDR (temp_forms)) |
3553 | { | |
b1cb24ff | 3554 | const SCM value = EVALCAR (temp_forms, env); |
dec40cd2 DH |
3555 | step_values = scm_cons (value, step_values); |
3556 | } | |
3557 | env = SCM_EXTEND_ENV (SCM_CAAR (env), | |
3558 | step_values, | |
3559 | SCM_CDR (env)); | |
3560 | } | |
0f2d19dd | 3561 | |
dec40cd2 DH |
3562 | test_result = EVALCAR (test_form, env); |
3563 | } | |
3564 | } | |
3565 | x = SCM_CDAR (x); | |
a61f4e0c | 3566 | if (scm_is_null (x)) |
dec40cd2 DH |
3567 | RETURN (SCM_UNSPECIFIED); |
3568 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3569 | goto nontoplevel_begin; | |
0f2d19dd JB |
3570 | |
3571 | ||
7e6e6b37 | 3572 | case (ISYMNUM (SCM_IM_IF)): |
dec40cd2 DH |
3573 | x = SCM_CDR (x); |
3574 | { | |
3575 | SCM test_result = EVALCAR (x, env); | |
3576 | x = SCM_CDR (x); /* then expression */ | |
7888309b | 3577 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3578 | { |
3579 | x = SCM_CDR (x); /* else expression */ | |
a61f4e0c | 3580 | if (scm_is_null (x)) |
dec40cd2 DH |
3581 | RETURN (SCM_UNSPECIFIED); |
3582 | } | |
3583 | } | |
3584 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3585 | goto carloop; | |
0f2d19dd JB |
3586 | |
3587 | ||
7e6e6b37 | 3588 | case (ISYMNUM (SCM_IM_LET)): |
dec40cd2 DH |
3589 | x = SCM_CDR (x); |
3590 | { | |
3591 | SCM init_forms = SCM_CADR (x); | |
3592 | SCM init_values = SCM_EOL; | |
3593 | do | |
3594 | { | |
3595 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3596 | init_forms = SCM_CDR (init_forms); | |
3597 | } | |
a61f4e0c | 3598 | while (!scm_is_null (init_forms)); |
dec40cd2 DH |
3599 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
3600 | } | |
3601 | x = SCM_CDDR (x); | |
3602 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3603 | goto nontoplevel_begin; | |
0f2d19dd JB |
3604 | |
3605 | ||
7e6e6b37 | 3606 | case (ISYMNUM (SCM_IM_LETREC)): |
dec40cd2 DH |
3607 | x = SCM_CDR (x); |
3608 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); | |
3609 | x = SCM_CDR (x); | |
3610 | { | |
3611 | SCM init_forms = SCM_CAR (x); | |
5defc05d NJ |
3612 | SCM init_values = scm_list_1 (SCM_BOOL_T); |
3613 | SCM *init_values_eol = SCM_CDRLOC (init_values); | |
3614 | eval_letrec_inits (env, init_forms, &init_values_eol); | |
3615 | SCM_SETCDR (SCM_CAR (env), SCM_CDR (init_values)); | |
dec40cd2 DH |
3616 | } |
3617 | x = SCM_CDR (x); | |
3618 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3619 | goto nontoplevel_begin; | |
0f2d19dd | 3620 | |
302c12b4 | 3621 | |
7e6e6b37 | 3622 | case (ISYMNUM (SCM_IM_LETSTAR)): |
dec40cd2 DH |
3623 | x = SCM_CDR (x); |
3624 | { | |
3625 | SCM bindings = SCM_CAR (x); | |
a61f4e0c | 3626 | if (!scm_is_null (bindings)) |
dec40cd2 DH |
3627 | { |
3628 | do | |
3629 | { | |
3630 | SCM name = SCM_CAR (bindings); | |
3631 | SCM init = SCM_CDR (bindings); | |
3632 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); | |
3633 | bindings = SCM_CDR (init); | |
3634 | } | |
a61f4e0c | 3635 | while (!scm_is_null (bindings)); |
dec40cd2 DH |
3636 | } |
3637 | } | |
3638 | x = SCM_CDR (x); | |
3639 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3640 | goto nontoplevel_begin; | |
0f2d19dd JB |
3641 | |
3642 | ||
7e6e6b37 | 3643 | case (ISYMNUM (SCM_IM_OR)): |
dec40cd2 | 3644 | x = SCM_CDR (x); |
a61f4e0c | 3645 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3646 | { |
3647 | SCM val = EVALCAR (x, env); | |
7888309b | 3648 | if (scm_is_true (val) && !SCM_NILP (val)) |
dec40cd2 DH |
3649 | RETURN (val); |
3650 | else | |
3651 | x = SCM_CDR (x); | |
3652 | } | |
3653 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3654 | goto carloop; | |
0f2d19dd JB |
3655 | |
3656 | ||
7e6e6b37 | 3657 | case (ISYMNUM (SCM_IM_LAMBDA)): |
dec40cd2 | 3658 | RETURN (scm_closure (SCM_CDR (x), env)); |
0f2d19dd JB |
3659 | |
3660 | ||
7e6e6b37 | 3661 | case (ISYMNUM (SCM_IM_QUOTE)): |
e7313a9d | 3662 | RETURN (SCM_CDR (x)); |
0f2d19dd JB |
3663 | |
3664 | ||
7e6e6b37 | 3665 | case (ISYMNUM (SCM_IM_SET_X)): |
dec40cd2 DH |
3666 | x = SCM_CDR (x); |
3667 | { | |
3668 | SCM *location; | |
3669 | SCM variable = SCM_CAR (x); | |
3670 | if (SCM_ILOCP (variable)) | |
3671 | location = scm_ilookup (variable, env); | |
3672 | else if (SCM_VARIABLEP (variable)) | |
3673 | location = SCM_VARIABLE_LOC (variable); | |
36245b66 DH |
3674 | else |
3675 | { | |
cc95e00a | 3676 | /* (scm_is_symbol (variable)) is known to be true */ |
36245b66 DH |
3677 | variable = lazy_memoize_variable (variable, env); |
3678 | SCM_SETCAR (x, variable); | |
3679 | location = SCM_VARIABLE_LOC (variable); | |
3680 | } | |
dec40cd2 DH |
3681 | x = SCM_CDR (x); |
3682 | *location = EVALCAR (x, env); | |
3683 | } | |
3684 | RETURN (SCM_UNSPECIFIED); | |
3f04400d DH |
3685 | |
3686 | ||
7e6e6b37 | 3687 | case (ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3688 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3689 | x = SCM_CDR (x); |
3690 | proc = EVALCAR (x, env); | |
3691 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3692 | |
3693 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3694 | x = SCM_CDR (x); |
3695 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3696 | |
3697 | apply_proc: | |
3698 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3699 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3700 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3701 | if (SCM_CLOSUREP (proc)) |
3702 | { | |
9a069bdd | 3703 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3704 | #ifdef DEVAL |
9a069bdd | 3705 | debug.info->a.args = arg1; |
6dbd0af5 | 3706 | #endif |
9a069bdd DH |
3707 | if (scm_badargsp (formals, arg1)) |
3708 | scm_wrong_num_args (proc); | |
3709 | ENTER_APPLY; | |
3710 | /* Copy argument list */ | |
3711 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3712 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3713 | else | |
3714 | { | |
3715 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3716 | SCM tail = args; | |
3717 | arg1 = SCM_CDR (arg1); | |
3718 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3719 | { | |
3720 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3721 | SCM_SETCDR (tail, new_tail); | |
3722 | tail = new_tail; | |
3723 | arg1 = SCM_CDR (arg1); | |
3724 | } | |
3725 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3726 | } | |
3727 | ||
3728 | x = SCM_CLOSURE_BODY (proc); | |
3729 | goto nontoplevel_begin; | |
0f2d19dd | 3730 | } |
3f04400d DH |
3731 | else |
3732 | { | |
e910e9d2 DH |
3733 | ENTER_APPLY; |
3734 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3735 | } |
3736 | ||
0f2d19dd | 3737 | |
7e6e6b37 | 3738 | case (ISYMNUM (SCM_IM_CONT)): |
5f144b10 GH |
3739 | { |
3740 | int first; | |
3741 | SCM val = scm_make_continuation (&first); | |
3742 | ||
e050d4f8 | 3743 | if (!first) |
5f144b10 | 3744 | RETURN (val); |
e050d4f8 DH |
3745 | else |
3746 | { | |
3747 | arg1 = val; | |
3748 | proc = SCM_CDR (x); | |
6bff1368 | 3749 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3750 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3751 | ENTER_APPLY; | |
e050d4f8 DH |
3752 | goto evap1; |
3753 | } | |
5f144b10 | 3754 | } |
e050d4f8 | 3755 | |
0f2d19dd | 3756 | |
7e6e6b37 | 3757 | case (ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3758 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3759 | |
2f263a6a MV |
3760 | #if 0 |
3761 | /* See futures.h for a comment why futures are not enabled. | |
3762 | */ | |
7e6e6b37 | 3763 | case (ISYMNUM (SCM_IM_FUTURE)): |
28d52ebb | 3764 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); |
2f263a6a | 3765 | #endif |
28d52ebb | 3766 | |
7e6e6b37 DH |
3767 | /* PLACEHOLDER for case (ISYMNUM (SCM_IM_DISPATCH)): The following |
3768 | code (type_dispatch) is intended to be the tail of the case | |
3769 | clause for the internal macro SCM_IM_DISPATCH. Please don't | |
3770 | remove it from this location without discussing it with Mikael | |
c8e1d354 MD |
3771 | <djurfeldt@nada.kth.se> */ |
3772 | ||
f12745b6 DH |
3773 | /* The type dispatch code is duplicated below |
3774 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3775 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3776 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3777 | /* Type dispatch means to determine from the types of the function |
3778 | * arguments (i. e. the 'signature' of the call), which method from | |
3779 | * a generic function is to be called. This process of selecting | |
3780 | * the right method takes some time. To speed it up, guile uses | |
3781 | * caching: Together with the macro call to dispatch the signatures | |
3782 | * of some previous calls to that generic function from the same | |
3783 | * place are stored (in the code!) in a cache that we call the | |
3784 | * 'method cache'. This is done since it is likely, that | |
3785 | * consecutive calls to dispatch from that position in the code will | |
3786 | * have the same signature. Thus, the type dispatch works as | |
3787 | * follows: First, determine a hash value from the signature of the | |
3788 | * actual arguments. Second, use this hash value as an index to | |
3789 | * find that same signature in the method cache stored at this | |
3790 | * position in the code. If found, you have also found the | |
3791 | * corresponding method that belongs to that signature. If the | |
3792 | * signature is not found in the method cache, you have to perform a | |
3793 | * full search over all signatures stored with the generic | |
3794 | * function. */ | |
3795 | { | |
3796 | unsigned long int specializers; | |
3797 | unsigned long int hash_value; | |
3798 | unsigned long int cache_end_pos; | |
3799 | unsigned long int mask; | |
3800 | SCM method_cache; | |
3801 | ||
3802 | { | |
3803 | SCM z = SCM_CDDR (x); | |
3804 | SCM tmp = SCM_CADR (z); | |
e11e83f3 | 3805 | specializers = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3806 | |
3807 | /* Compute a hash value for searching the method cache. There | |
3808 | * are two variants for computing the hash value, a (rather) | |
3809 | * complicated one, and a simple one. For the complicated one | |
3810 | * explained below, tmp holds a number that is used in the | |
3811 | * computation. */ | |
4057a3e0 | 3812 | if (scm_is_simple_vector (tmp)) |
e11e83f3 MV |
3813 | { |
3814 | /* This method of determining the hash value is much | |
3815 | * simpler: Set the hash value to zero and just perform a | |
3816 | * linear search through the method cache. */ | |
3817 | method_cache = tmp; | |
3818 | mask = (unsigned long int) ((long) -1); | |
3819 | hash_value = 0; | |
4057a3e0 | 3820 | cache_end_pos = SCM_SIMPLE_VECTOR_LENGTH (method_cache); |
e11e83f3 MV |
3821 | } |
3822 | else | |
f12745b6 DH |
3823 | { |
3824 | /* Use the signature of the actual arguments to determine | |
3825 | * the hash value. This is done as follows: Each class has | |
3826 | * an array of random numbers, that are determined when the | |
3827 | * class is created. The integer 'hashset' is an index into | |
3828 | * that array of random numbers. Now, from all classes that | |
3829 | * are part of the signature of the actual arguments, the | |
3830 | * random numbers at index 'hashset' are taken and summed | |
3831 | * up, giving the hash value. The value of 'hashset' is | |
3832 | * stored at the call to dispatch. This allows to have | |
3833 | * different 'formulas' for calculating the hash value at | |
3834 | * different places where dispatch is called. This allows | |
3835 | * to optimize the hash formula at every individual place | |
3836 | * where dispatch is called, such that hopefully the hash | |
3837 | * value that is computed will directly point to the right | |
3838 | * method in the method cache. */ | |
e11e83f3 | 3839 | unsigned long int hashset = scm_to_ulong (tmp); |
f12745b6 | 3840 | unsigned long int counter = specializers + 1; |
dff98306 | 3841 | SCM tmp_arg = arg1; |
f12745b6 | 3842 | hash_value = 0; |
a61f4e0c | 3843 | while (!scm_is_null (tmp_arg) && counter != 0) |
61364ba6 | 3844 | { |
f12745b6 DH |
3845 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3846 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3847 | tmp_arg = SCM_CDR (tmp_arg); | |
3848 | counter--; | |
61364ba6 | 3849 | } |
f12745b6 DH |
3850 | z = SCM_CDDR (z); |
3851 | method_cache = SCM_CADR (z); | |
e11e83f3 | 3852 | mask = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3853 | hash_value &= mask; |
3854 | cache_end_pos = hash_value; | |
3855 | } | |
f12745b6 | 3856 | } |
61364ba6 | 3857 | |
f12745b6 DH |
3858 | { |
3859 | /* Search the method cache for a method with a matching | |
3860 | * signature. Start the search at position 'hash_value'. The | |
3861 | * hashing implementation uses linear probing for conflict | |
3862 | * resolution, that is, if the signature in question is not | |
3863 | * found at the starting index in the hash table, the next table | |
3864 | * entry is tried, and so on, until in the worst case the whole | |
3865 | * cache has been searched, but still the signature has not been | |
3866 | * found. */ | |
3867 | SCM z; | |
3868 | do | |
3869 | { | |
dff98306 | 3870 | SCM args = arg1; /* list of arguments */ |
4057a3e0 | 3871 | z = SCM_SIMPLE_VECTOR_REF (method_cache, hash_value); |
a61f4e0c | 3872 | while (!scm_is_null (args)) |
61364ba6 MD |
3873 | { |
3874 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 | 3875 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
bc36d050 | 3876 | if (!scm_is_eq (class_of_arg, SCM_CAR (z))) |
61364ba6 | 3877 | goto next_method; |
f12745b6 | 3878 | args = SCM_CDR (args); |
61364ba6 MD |
3879 | z = SCM_CDR (z); |
3880 | } | |
f12745b6 | 3881 | /* Fewer arguments than specifiers => CAR != ENV */ |
a61f4e0c | 3882 | if (scm_is_null (SCM_CAR (z)) || scm_is_pair (SCM_CAR (z))) |
f12745b6 DH |
3883 | goto apply_cmethod; |
3884 | next_method: | |
3885 | hash_value = (hash_value + 1) & mask; | |
3886 | } while (hash_value != cache_end_pos); | |
3887 | ||
3888 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3889 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3890 | |
dff98306 | 3891 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3892 | { |
3893 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3894 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3895 | x = SCM_CMETHOD_BODY (z); |
3896 | goto nontoplevel_begin; | |
3897 | } | |
3898 | } | |
61364ba6 | 3899 | } |
73b64342 | 3900 | |
1d15ecd3 | 3901 | |
7e6e6b37 | 3902 | case (ISYMNUM (SCM_IM_SLOT_REF)): |
ca4be6ea | 3903 | x = SCM_CDR (x); |
1d15ecd3 DH |
3904 | { |
3905 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3906 | unsigned long int slot = SCM_I_INUM (SCM_CDR (x)); |
1d15ecd3 DH |
3907 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); |
3908 | } | |
3909 | ||
3910 | ||
7e6e6b37 | 3911 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): |
ca4be6ea | 3912 | x = SCM_CDR (x); |
1d15ecd3 DH |
3913 | { |
3914 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3915 | unsigned long int slot = SCM_I_INUM (SCM_CADR (x)); |
1d15ecd3 DH |
3916 | SCM value = EVALCAR (SCM_CDDR (x), env); |
3917 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3918 | RETURN (SCM_UNSPECIFIED); | |
3919 | } | |
3920 | ||
c96d76b8 | 3921 | |
22721140 | 3922 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3923 | |
7e6e6b37 | 3924 | case (ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3925 | { |
3926 | SCM test_form = SCM_CDR (x); | |
3927 | x = SCM_CDR (test_form); | |
3928 | while (!SCM_NULL_OR_NIL_P (x)) | |
3929 | { | |
3930 | SCM test_result = EVALCAR (test_form, env); | |
7888309b | 3931 | if (!(scm_is_false (test_result) |
1d15ecd3 DH |
3932 | || SCM_NULL_OR_NIL_P (test_result))) |
3933 | { | |
bc36d050 | 3934 | if (scm_is_eq (SCM_CAR (x), SCM_UNSPECIFIED)) |
1d15ecd3 DH |
3935 | RETURN (test_result); |
3936 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3937 | goto carloop; | |
3938 | } | |
3939 | else | |
3940 | { | |
3941 | test_form = SCM_CDR (x); | |
3942 | x = SCM_CDR (test_form); | |
3943 | } | |
3944 | } | |
3945 | x = test_form; | |
3946 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3947 | goto carloop; | |
3948 | } | |
73b64342 | 3949 | |
c96d76b8 | 3950 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 | 3951 | |
7e6e6b37 | 3952 | case (ISYMNUM (SCM_IM_BIND)): |
2e171178 MV |
3953 | { |
3954 | SCM vars, exps, vals; | |
73b64342 | 3955 | |
2e171178 MV |
3956 | x = SCM_CDR (x); |
3957 | vars = SCM_CAAR (x); | |
3958 | exps = SCM_CDAR (x); | |
2e171178 | 3959 | vals = SCM_EOL; |
a61f4e0c | 3960 | while (!scm_is_null (exps)) |
2e171178 MV |
3961 | { |
3962 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3963 | exps = SCM_CDR (exps); | |
3964 | } | |
3965 | ||
3966 | scm_swap_bindings (vars, vals); | |
9de87eea | 3967 | scm_i_set_dynwinds (scm_acons (vars, vals, scm_i_dynwinds ())); |
1d15ecd3 DH |
3968 | |
3969 | /* Ignore all but the last evaluation result. */ | |
a61f4e0c | 3970 | for (x = SCM_CDR (x); !scm_is_null (SCM_CDR (x)); x = SCM_CDR (x)) |
2e171178 | 3971 | { |
a61f4e0c | 3972 | if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 3973 | CEVAL (SCM_CAR (x), env); |
2e171178 MV |
3974 | } |
3975 | proc = EVALCAR (x, env); | |
73b64342 | 3976 | |
9de87eea | 3977 | scm_i_set_dynwinds (SCM_CDR (scm_i_dynwinds ())); |
2e171178 | 3978 | scm_swap_bindings (vars, vals); |
73b64342 | 3979 | |
ddea3325 | 3980 | RETURN (proc); |
2e171178 | 3981 | } |
c96d76b8 | 3982 | |
1d15ecd3 | 3983 | |
7e6e6b37 | 3984 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 3985 | { |
9a069bdd DH |
3986 | SCM producer; |
3987 | ||
3988 | x = SCM_CDR (x); | |
3989 | producer = EVALCAR (x, env); | |
3990 | x = SCM_CDR (x); | |
3991 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3992 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3993 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3994 | { |
3995 | /* The list of arguments is not copied. Rather, it is assumed | |
3996 | * that this has been done by the 'values' procedure. */ | |
3997 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3998 | } | |
a513ead3 | 3999 | else |
82b3e2c6 DH |
4000 | { |
4001 | arg1 = scm_list_1 (arg1); | |
4002 | } | |
9a069bdd DH |
4003 | PREP_APPLY (proc, arg1); |
4004 | goto apply_proc; | |
a513ead3 MV |
4005 | } |
4006 | ||
b7798e10 | 4007 | |
0f2d19dd | 4008 | default: |
dec40cd2 | 4009 | break; |
0f2d19dd | 4010 | } |
dec40cd2 DH |
4011 | } |
4012 | else | |
4013 | { | |
434f2f7a DH |
4014 | if (SCM_VARIABLEP (SCM_CAR (x))) |
4015 | proc = SCM_VARIABLE_REF (SCM_CAR (x)); | |
f9986767 DH |
4016 | else if (SCM_ILOCP (SCM_CAR (x))) |
4017 | proc = *scm_ilookup (SCM_CAR (x), env); | |
a61f4e0c | 4018 | else if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 4019 | proc = CEVAL (SCM_CAR (x), env); |
cc95e00a | 4020 | else if (scm_is_symbol (SCM_CAR (x))) |
0f2d19dd | 4021 | { |
e050d4f8 | 4022 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
4023 | { |
4024 | SCM *location = scm_lookupcar1 (x, env, 1); | |
4025 | if (location == NULL) | |
4026 | { | |
4027 | /* we have lost the race, start again. */ | |
4028 | goto dispatch; | |
4029 | } | |
4030 | proc = *location; | |
4031 | } | |
f8769b1d | 4032 | |
22a52da1 | 4033 | if (SCM_MACROP (proc)) |
0f2d19dd | 4034 | { |
86d31dfe MV |
4035 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
4036 | lookupcar */ | |
e050d4f8 | 4037 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 4038 | #ifdef DEVAL |
7c354052 MD |
4039 | /* Set a flag during macro expansion so that macro |
4040 | application frames can be deleted from the backtrace. */ | |
4041 | SCM_SET_MACROEXP (debug); | |
368bf056 | 4042 | #endif |
dff98306 | 4043 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 4044 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
4045 | #ifdef DEVAL |
4046 | SCM_CLEAR_MACROEXP (debug); | |
4047 | #endif | |
22a52da1 | 4048 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 4049 | { |
3b88ed2a | 4050 | case 3: |
0f2d19dd | 4051 | case 2: |
a61f4e0c | 4052 | if (!scm_is_pair (arg1)) |
dff98306 | 4053 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); |
e7313a9d | 4054 | |
bc36d050 MV |
4055 | assert (!scm_is_eq (x, SCM_CAR (arg1)) |
4056 | && !scm_is_eq (x, SCM_CDR (arg1))); | |
e7313a9d | 4057 | |
6dbd0af5 | 4058 | #ifdef DEVAL |
22a52da1 | 4059 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 4060 | { |
9de87eea | 4061 | SCM_CRITICAL_SECTION_START; |
dff98306 DH |
4062 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4063 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
9de87eea | 4064 | SCM_CRITICAL_SECTION_END; |
6dbd0af5 MD |
4065 | goto dispatch; |
4066 | } | |
4067 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
4068 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
4069 | SCM_CAR (x), | |
4070 | SCM_CDR (x)); | |
6dbd0af5 | 4071 | #endif |
9de87eea | 4072 | SCM_CRITICAL_SECTION_START; |
dff98306 DH |
4073 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4074 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
9de87eea | 4075 | SCM_CRITICAL_SECTION_END; |
680516ba DH |
4076 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
4077 | goto loop; | |
3063e30a | 4078 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 4079 | case 1: |
680516ba DH |
4080 | x = arg1; |
4081 | if (SCM_NIMP (x)) | |
4082 | { | |
4083 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
4084 | goto loop; | |
4085 | } | |
4086 | else | |
4087 | RETURN (arg1); | |
3063e30a | 4088 | #endif |
0f2d19dd | 4089 | case 0: |
dff98306 | 4090 | RETURN (arg1); |
0f2d19dd JB |
4091 | } |
4092 | } | |
4093 | } | |
4094 | else | |
434f2f7a | 4095 | proc = SCM_CAR (x); |
bd987b8e | 4096 | |
ddd8f927 | 4097 | if (SCM_MACROP (proc)) |
0f2d19dd | 4098 | goto handle_a_macro; |
0f2d19dd JB |
4099 | } |
4100 | ||
4101 | ||
dec40cd2 DH |
4102 | /* When reaching this part of the code, the following is granted: Variable x |
4103 | * holds the first pair of an expression of the form (<function> arg ...). | |
4104 | * Variable proc holds the object that resulted from the evaluation of | |
4105 | * <function>. In the following, the arguments (if any) will be evaluated, | |
4106 | * and proc will be applied to them. If proc does not really hold a | |
4107 | * function object, this will be signalled as an error on the scheme | |
4108 | * level. If the number of arguments does not match the number of arguments | |
4109 | * that are allowed to be passed to proc, also an error on the scheme level | |
4110 | * will be signalled. */ | |
6dbd0af5 | 4111 | PREP_APPLY (proc, SCM_EOL); |
a61f4e0c | 4112 | if (scm_is_null (SCM_CDR (x))) { |
6dbd0af5 | 4113 | ENTER_APPLY; |
89efbff4 | 4114 | evap0: |
ddd8f927 | 4115 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
4116 | switch (SCM_TYP7 (proc)) |
4117 | { /* no arguments given */ | |
4118 | case scm_tc7_subr_0: | |
4119 | RETURN (SCM_SUBRF (proc) ()); | |
4120 | case scm_tc7_subr_1o: | |
4121 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
4122 | case scm_tc7_lsubr: | |
4123 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
4124 | case scm_tc7_rpsubr: | |
4125 | RETURN (SCM_BOOL_T); | |
4126 | case scm_tc7_asubr: | |
4127 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 4128 | case scm_tc7_smob: |
68b06924 | 4129 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4130 | goto badfun; |
68b06924 | 4131 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 4132 | case scm_tc7_cclo: |
dff98306 | 4133 | arg1 = proc; |
0f2d19dd | 4134 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
4135 | #ifdef DEVAL |
4136 | debug.info->a.proc = proc; | |
dff98306 | 4137 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4138 | #endif |
0f2d19dd | 4139 | goto evap1; |
89efbff4 MD |
4140 | case scm_tc7_pws: |
4141 | proc = SCM_PROCEDURE (proc); | |
4142 | #ifdef DEVAL | |
4143 | debug.info->a.proc = proc; | |
4144 | #endif | |
002f1a5d MD |
4145 | if (!SCM_CLOSUREP (proc)) |
4146 | goto evap0; | |
ddd8f927 | 4147 | /* fallthrough */ |
0f2d19dd | 4148 | case scm_tcs_closures: |
ddd8f927 DH |
4149 | { |
4150 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 4151 | if (scm_is_pair (formals)) |
212e58ed | 4152 | goto wrongnumargs; |
ddd8f927 DH |
4153 | x = SCM_CLOSURE_BODY (proc); |
4154 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
4155 | goto nontoplevel_begin; | |
4156 | } | |
904a077d | 4157 | case scm_tcs_struct: |
195847fa MD |
4158 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4159 | { | |
4160 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 4161 | arg1 = SCM_EOL; |
195847fa MD |
4162 | goto type_dispatch; |
4163 | } | |
2ca0d207 | 4164 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4165 | { |
dff98306 | 4166 | arg1 = proc; |
195847fa MD |
4167 | proc = (SCM_I_ENTITYP (proc) |
4168 | ? SCM_ENTITY_PROCEDURE (proc) | |
4169 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 4170 | #ifdef DEVAL |
195847fa | 4171 | debug.info->a.proc = proc; |
dff98306 | 4172 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 4173 | #endif |
ddd8f927 | 4174 | goto evap1; |
da7f71d7 | 4175 | } |
2ca0d207 DH |
4176 | else |
4177 | goto badfun; | |
0f2d19dd JB |
4178 | case scm_tc7_subr_1: |
4179 | case scm_tc7_subr_2: | |
4180 | case scm_tc7_subr_2o: | |
14b18ed6 | 4181 | case scm_tc7_dsubr: |
0f2d19dd JB |
4182 | case scm_tc7_cxr: |
4183 | case scm_tc7_subr_3: | |
4184 | case scm_tc7_lsubr_2: | |
212e58ed | 4185 | wrongnumargs: |
f5bf2977 | 4186 | scm_wrong_num_args (proc); |
0f2d19dd | 4187 | default: |
ddd8f927 DH |
4188 | badfun: |
4189 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 4190 | } |
6dbd0af5 | 4191 | } |
0f2d19dd JB |
4192 | |
4193 | /* must handle macros by here */ | |
4194 | x = SCM_CDR (x); | |
a61f4e0c | 4195 | if (scm_is_pair (x)) |
dff98306 | 4196 | arg1 = EVALCAR (x, env); |
680ed4a8 | 4197 | else |
ab1f1094 | 4198 | scm_wrong_num_args (proc); |
6dbd0af5 | 4199 | #ifdef DEVAL |
dff98306 | 4200 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4201 | #endif |
0f2d19dd | 4202 | x = SCM_CDR (x); |
42030fb2 DH |
4203 | { |
4204 | SCM arg2; | |
a61f4e0c | 4205 | if (scm_is_null (x)) |
42030fb2 DH |
4206 | { |
4207 | ENTER_APPLY; | |
4208 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 4209 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4210 | switch (SCM_TYP7 (proc)) |
4211 | { /* have one argument in arg1 */ | |
4212 | case scm_tc7_subr_2o: | |
4213 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4214 | case scm_tc7_subr_1: | |
4215 | case scm_tc7_subr_1o: | |
4216 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4217 | case scm_tc7_dsubr: |
e11e83f3 | 4218 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4219 | { |
d9a67fc4 | 4220 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4221 | } |
4222 | else if (SCM_REALP (arg1)) | |
4223 | { | |
d9a67fc4 | 4224 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4225 | } |
4226 | else if (SCM_BIGP (arg1)) | |
4227 | { | |
d9a67fc4 | 4228 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
14b18ed6 | 4229 | } |
f92e85f7 MV |
4230 | else if (SCM_FRACTIONP (arg1)) |
4231 | { | |
d9a67fc4 | 4232 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 MV |
4233 | } |
4234 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
cc95e00a MV |
4235 | SCM_ARG1, |
4236 | scm_i_symbol_chars (SCM_SNAME (proc))); | |
42030fb2 | 4237 | case scm_tc7_cxr: |
a61f4e0c | 4238 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
42030fb2 DH |
4239 | case scm_tc7_rpsubr: |
4240 | RETURN (SCM_BOOL_T); | |
4241 | case scm_tc7_asubr: | |
4242 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4243 | case scm_tc7_lsubr: | |
0f2d19dd | 4244 | #ifdef DEVAL |
42030fb2 | 4245 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 4246 | #else |
42030fb2 | 4247 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 4248 | #endif |
42030fb2 DH |
4249 | case scm_tc7_smob: |
4250 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4251 | goto badfun; | |
4252 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
4253 | case scm_tc7_cclo: | |
4254 | arg2 = arg1; | |
4255 | arg1 = proc; | |
4256 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4257 | #ifdef DEVAL |
42030fb2 DH |
4258 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4259 | debug.info->a.proc = proc; | |
6dbd0af5 | 4260 | #endif |
42030fb2 DH |
4261 | goto evap2; |
4262 | case scm_tc7_pws: | |
4263 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 4264 | #ifdef DEVAL |
42030fb2 | 4265 | debug.info->a.proc = proc; |
89efbff4 | 4266 | #endif |
42030fb2 DH |
4267 | if (!SCM_CLOSUREP (proc)) |
4268 | goto evap1; | |
ddd8f927 | 4269 | /* fallthrough */ |
42030fb2 | 4270 | case scm_tcs_closures: |
ddd8f927 DH |
4271 | { |
4272 | /* clos1: */ | |
4273 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4274 | if (scm_is_null (formals) |
4275 | || (scm_is_pair (formals) && scm_is_pair (SCM_CDR (formals)))) | |
212e58ed | 4276 | goto wrongnumargs; |
ddd8f927 | 4277 | x = SCM_CLOSURE_BODY (proc); |
0f2d19dd | 4278 | #ifdef DEVAL |
ddd8f927 DH |
4279 | env = SCM_EXTEND_ENV (formals, |
4280 | debug.info->a.args, | |
4281 | SCM_ENV (proc)); | |
0f2d19dd | 4282 | #else |
ddd8f927 DH |
4283 | env = SCM_EXTEND_ENV (formals, |
4284 | scm_list_1 (arg1), | |
4285 | SCM_ENV (proc)); | |
0f2d19dd | 4286 | #endif |
ddd8f927 DH |
4287 | goto nontoplevel_begin; |
4288 | } | |
42030fb2 DH |
4289 | case scm_tcs_struct: |
4290 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4291 | { | |
4292 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 4293 | #ifdef DEVAL |
42030fb2 | 4294 | arg1 = debug.info->a.args; |
f3d2630a | 4295 | #else |
42030fb2 | 4296 | arg1 = scm_list_1 (arg1); |
f3d2630a | 4297 | #endif |
42030fb2 DH |
4298 | goto type_dispatch; |
4299 | } | |
2ca0d207 | 4300 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4301 | { |
4302 | arg2 = arg1; | |
4303 | arg1 = proc; | |
4304 | proc = (SCM_I_ENTITYP (proc) | |
4305 | ? SCM_ENTITY_PROCEDURE (proc) | |
4306 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 4307 | #ifdef DEVAL |
42030fb2 DH |
4308 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4309 | debug.info->a.proc = proc; | |
0c32d76c | 4310 | #endif |
ddd8f927 | 4311 | goto evap2; |
42030fb2 | 4312 | } |
2ca0d207 DH |
4313 | else |
4314 | goto badfun; | |
42030fb2 DH |
4315 | case scm_tc7_subr_2: |
4316 | case scm_tc7_subr_0: | |
4317 | case scm_tc7_subr_3: | |
4318 | case scm_tc7_lsubr_2: | |
ab1f1094 | 4319 | scm_wrong_num_args (proc); |
42030fb2 DH |
4320 | default: |
4321 | goto badfun; | |
4322 | } | |
4323 | } | |
a61f4e0c | 4324 | if (scm_is_pair (x)) |
42030fb2 DH |
4325 | arg2 = EVALCAR (x, env); |
4326 | else | |
ab1f1094 | 4327 | scm_wrong_num_args (proc); |
bd987b8e | 4328 | |
42030fb2 | 4329 | { /* have two or more arguments */ |
6dbd0af5 | 4330 | #ifdef DEVAL |
42030fb2 | 4331 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 4332 | #endif |
42030fb2 | 4333 | x = SCM_CDR (x); |
a61f4e0c | 4334 | if (scm_is_null (x)) { |
42030fb2 DH |
4335 | ENTER_APPLY; |
4336 | evap2: | |
ddd8f927 | 4337 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4338 | switch (SCM_TYP7 (proc)) |
4339 | { /* have two arguments */ | |
4340 | case scm_tc7_subr_2: | |
4341 | case scm_tc7_subr_2o: | |
4342 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4343 | case scm_tc7_lsubr: | |
0f2d19dd | 4344 | #ifdef DEVAL |
42030fb2 | 4345 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 4346 | #else |
42030fb2 DH |
4347 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
4348 | #endif | |
4349 | case scm_tc7_lsubr_2: | |
4350 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
4351 | case scm_tc7_rpsubr: | |
4352 | case scm_tc7_asubr: | |
4353 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4354 | case scm_tc7_smob: | |
4355 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4356 | goto badfun; | |
4357 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
4358 | cclon: | |
4359 | case scm_tc7_cclo: | |
0f2d19dd | 4360 | #ifdef DEVAL |
42030fb2 DH |
4361 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4362 | scm_cons (proc, debug.info->a.args), | |
4363 | SCM_EOL)); | |
0f2d19dd | 4364 | #else |
42030fb2 DH |
4365 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4366 | scm_cons2 (proc, arg1, | |
4367 | scm_cons (arg2, | |
4368 | scm_eval_args (x, | |
4369 | env, | |
4370 | proc))), | |
4371 | SCM_EOL)); | |
4372 | #endif | |
4373 | case scm_tcs_struct: | |
4374 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4375 | { | |
4376 | x = SCM_ENTITY_PROCEDURE (proc); | |
4377 | #ifdef DEVAL | |
4378 | arg1 = debug.info->a.args; | |
4379 | #else | |
4380 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 4381 | #endif |
42030fb2 DH |
4382 | goto type_dispatch; |
4383 | } | |
2ca0d207 | 4384 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4385 | { |
4386 | operatorn: | |
f3d2630a | 4387 | #ifdef DEVAL |
42030fb2 DH |
4388 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4389 | ? SCM_ENTITY_PROCEDURE (proc) | |
4390 | : SCM_OPERATOR_PROCEDURE (proc), | |
4391 | scm_cons (proc, debug.info->a.args), | |
4392 | SCM_EOL)); | |
f3d2630a | 4393 | #else |
42030fb2 DH |
4394 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4395 | ? SCM_ENTITY_PROCEDURE (proc) | |
4396 | : SCM_OPERATOR_PROCEDURE (proc), | |
4397 | scm_cons2 (proc, arg1, | |
4398 | scm_cons (arg2, | |
4399 | scm_eval_args (x, | |
4400 | env, | |
4401 | proc))), | |
4402 | SCM_EOL)); | |
f3d2630a | 4403 | #endif |
42030fb2 | 4404 | } |
2ca0d207 DH |
4405 | else |
4406 | goto badfun; | |
42030fb2 | 4407 | case scm_tc7_subr_0: |
14b18ed6 | 4408 | case scm_tc7_dsubr: |
42030fb2 DH |
4409 | case scm_tc7_cxr: |
4410 | case scm_tc7_subr_1o: | |
4411 | case scm_tc7_subr_1: | |
4412 | case scm_tc7_subr_3: | |
ab1f1094 | 4413 | scm_wrong_num_args (proc); |
42030fb2 | 4414 | default: |
9b07e212 | 4415 | goto badfun; |
42030fb2 DH |
4416 | case scm_tc7_pws: |
4417 | proc = SCM_PROCEDURE (proc); | |
4418 | #ifdef DEVAL | |
4419 | debug.info->a.proc = proc; | |
4420 | #endif | |
4421 | if (!SCM_CLOSUREP (proc)) | |
4422 | goto evap2; | |
ddd8f927 | 4423 | /* fallthrough */ |
42030fb2 | 4424 | case scm_tcs_closures: |
ddd8f927 DH |
4425 | { |
4426 | /* clos2: */ | |
4427 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4428 | if (scm_is_null (formals) |
4429 | || (scm_is_pair (formals) | |
4430 | && (scm_is_null (SCM_CDR (formals)) | |
4431 | || (scm_is_pair (SCM_CDR (formals)) | |
4432 | && scm_is_pair (SCM_CDDR (formals)))))) | |
212e58ed | 4433 | goto wrongnumargs; |
0c32d76c | 4434 | #ifdef DEVAL |
ddd8f927 DH |
4435 | env = SCM_EXTEND_ENV (formals, |
4436 | debug.info->a.args, | |
4437 | SCM_ENV (proc)); | |
195847fa | 4438 | #else |
ddd8f927 DH |
4439 | env = SCM_EXTEND_ENV (formals, |
4440 | scm_list_2 (arg1, arg2), | |
4441 | SCM_ENV (proc)); | |
195847fa | 4442 | #endif |
ddd8f927 DH |
4443 | x = SCM_CLOSURE_BODY (proc); |
4444 | goto nontoplevel_begin; | |
4445 | } | |
42030fb2 DH |
4446 | } |
4447 | } | |
a61f4e0c | 4448 | if (!scm_is_pair (x)) |
ab1f1094 | 4449 | scm_wrong_num_args (proc); |
42030fb2 DH |
4450 | #ifdef DEVAL |
4451 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4452 | deval_args (x, env, proc, | |
4453 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4454 | #endif | |
4455 | ENTER_APPLY; | |
4456 | evap3: | |
ddd8f927 | 4457 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4458 | switch (SCM_TYP7 (proc)) |
4459 | { /* have 3 or more arguments */ | |
4460 | #ifdef DEVAL | |
6dbd0af5 | 4461 | case scm_tc7_subr_3: |
a61f4e0c | 4462 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4463 | scm_wrong_num_args (proc); |
4464 | else | |
4465 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4466 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4467 | case scm_tc7_asubr: |
4468 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4469 | arg2 = SCM_CDDR (debug.info->a.args); | |
4470 | do | |
4471 | { | |
4472 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4473 | arg2 = SCM_CDR (arg2); | |
4474 | } | |
4475 | while (SCM_NIMP (arg2)); | |
4476 | RETURN (arg1); | |
4477 | case scm_tc7_rpsubr: | |
7888309b | 4478 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4479 | RETURN (SCM_BOOL_F); |
4480 | arg1 = SCM_CDDR (debug.info->a.args); | |
4481 | do | |
4482 | { | |
7888309b | 4483 | if (scm_is_false (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) |
42030fb2 DH |
4484 | RETURN (SCM_BOOL_F); |
4485 | arg2 = SCM_CAR (arg1); | |
4486 | arg1 = SCM_CDR (arg1); | |
4487 | } | |
4488 | while (SCM_NIMP (arg1)); | |
4489 | RETURN (SCM_BOOL_T); | |
4490 | case scm_tc7_lsubr_2: | |
4491 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4492 | SCM_CDDR (debug.info->a.args))); | |
4493 | case scm_tc7_lsubr: | |
4494 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4495 | case scm_tc7_smob: | |
4496 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4497 | goto badfun; | |
4498 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4499 | SCM_CDDR (debug.info->a.args))); | |
4500 | case scm_tc7_cclo: | |
4501 | goto cclon; | |
002f1a5d MD |
4502 | case scm_tc7_pws: |
4503 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4504 | debug.info->a.proc = proc; |
002f1a5d | 4505 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4506 | goto evap3; |
ddd8f927 | 4507 | /* fallthrough */ |
6dbd0af5 | 4508 | case scm_tcs_closures: |
ddd8f927 DH |
4509 | { |
4510 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4511 | if (scm_is_null (formals) |
4512 | || (scm_is_pair (formals) | |
4513 | && (scm_is_null (SCM_CDR (formals)) | |
4514 | || (scm_is_pair (SCM_CDR (formals)) | |
ddd8f927 | 4515 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4516 | goto wrongnumargs; |
ddd8f927 DH |
4517 | SCM_SET_ARGSREADY (debug); |
4518 | env = SCM_EXTEND_ENV (formals, | |
4519 | debug.info->a.args, | |
4520 | SCM_ENV (proc)); | |
4521 | x = SCM_CLOSURE_BODY (proc); | |
4522 | goto nontoplevel_begin; | |
4523 | } | |
6dbd0af5 | 4524 | #else /* DEVAL */ |
42030fb2 | 4525 | case scm_tc7_subr_3: |
a61f4e0c | 4526 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4527 | scm_wrong_num_args (proc); |
4528 | else | |
4529 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4530 | case scm_tc7_asubr: |
4531 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4532 | do | |
4533 | { | |
4534 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4535 | x = SCM_CDR(x); | |
4536 | } | |
a61f4e0c | 4537 | while (!scm_is_null (x)); |
42030fb2 DH |
4538 | RETURN (arg1); |
4539 | case scm_tc7_rpsubr: | |
7888309b | 4540 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4541 | RETURN (SCM_BOOL_F); |
4542 | do | |
4543 | { | |
4544 | arg1 = EVALCAR (x, env); | |
7888309b | 4545 | if (scm_is_false (SCM_SUBRF (proc) (arg2, arg1))) |
42030fb2 DH |
4546 | RETURN (SCM_BOOL_F); |
4547 | arg2 = arg1; | |
4548 | x = SCM_CDR (x); | |
4549 | } | |
a61f4e0c | 4550 | while (!scm_is_null (x)); |
42030fb2 DH |
4551 | RETURN (SCM_BOOL_T); |
4552 | case scm_tc7_lsubr_2: | |
4553 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4554 | case scm_tc7_lsubr: | |
4555 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4556 | arg2, | |
4557 | scm_eval_args (x, env, proc)))); | |
4558 | case scm_tc7_smob: | |
4559 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4560 | goto badfun; | |
4561 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4562 | scm_eval_args (x, env, proc))); | |
4563 | case scm_tc7_cclo: | |
4564 | goto cclon; | |
4565 | case scm_tc7_pws: | |
4566 | proc = SCM_PROCEDURE (proc); | |
4567 | if (!SCM_CLOSUREP (proc)) | |
4568 | goto evap3; | |
ddd8f927 DH |
4569 | /* fallthrough */ |
4570 | case scm_tcs_closures: | |
da7f71d7 | 4571 | { |
ddd8f927 | 4572 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
a61f4e0c MV |
4573 | if (scm_is_null (formals) |
4574 | || (scm_is_pair (formals) | |
4575 | && (scm_is_null (SCM_CDR (formals)) | |
4576 | || (scm_is_pair (SCM_CDR (formals)) | |
42030fb2 | 4577 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4578 | goto wrongnumargs; |
ddd8f927 DH |
4579 | env = SCM_EXTEND_ENV (formals, |
4580 | scm_cons2 (arg1, | |
4581 | arg2, | |
4582 | scm_eval_args (x, env, proc)), | |
4583 | SCM_ENV (proc)); | |
4584 | x = SCM_CLOSURE_BODY (proc); | |
4585 | goto nontoplevel_begin; | |
da7f71d7 | 4586 | } |
0f2d19dd | 4587 | #endif /* DEVAL */ |
42030fb2 DH |
4588 | case scm_tcs_struct: |
4589 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4590 | { | |
f3d2630a | 4591 | #ifdef DEVAL |
42030fb2 | 4592 | arg1 = debug.info->a.args; |
f3d2630a | 4593 | #else |
42030fb2 | 4594 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4595 | #endif |
42030fb2 DH |
4596 | x = SCM_ENTITY_PROCEDURE (proc); |
4597 | goto type_dispatch; | |
4598 | } | |
2ca0d207 | 4599 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4600 | goto operatorn; |
2ca0d207 DH |
4601 | else |
4602 | goto badfun; | |
42030fb2 DH |
4603 | case scm_tc7_subr_2: |
4604 | case scm_tc7_subr_1o: | |
4605 | case scm_tc7_subr_2o: | |
4606 | case scm_tc7_subr_0: | |
14b18ed6 | 4607 | case scm_tc7_dsubr: |
42030fb2 DH |
4608 | case scm_tc7_cxr: |
4609 | case scm_tc7_subr_1: | |
ab1f1094 | 4610 | scm_wrong_num_args (proc); |
42030fb2 | 4611 | default: |
9b07e212 | 4612 | goto badfun; |
42030fb2 DH |
4613 | } |
4614 | } | |
0f2d19dd JB |
4615 | } |
4616 | #ifdef DEVAL | |
6dbd0af5 | 4617 | exit: |
5132eef0 | 4618 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4619 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4620 | { |
b7ff98dd | 4621 | SCM_CLEAR_TRACED_FRAME (debug); |
7c9c0169 | 4622 | arg1 = scm_make_debugobj (&debug); |
d95c0b76 | 4623 | SCM_TRAPS_P = 0; |
7c9c0169 | 4624 | arg1 = scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4625 | SCM_TRAPS_P = 1; |
7c9c0169 NJ |
4626 | if (scm_is_pair (arg1) && scm_is_eq (SCM_CAR (arg1), sym_instead)) |
4627 | proc = SCM_CDR (arg1); | |
6dbd0af5 | 4628 | } |
9de87eea | 4629 | scm_i_set_last_debug_frame (debug.prev); |
0f2d19dd JB |
4630 | return proc; |
4631 | #endif | |
4632 | } | |
4633 | ||
6dbd0af5 MD |
4634 | |
4635 | /* SECTION: This code is compiled once. | |
4636 | */ | |
4637 | ||
0f2d19dd JB |
4638 | #ifndef DEVAL |
4639 | ||
fdc28395 | 4640 | \f |
d0b07b5d | 4641 | |
fdc28395 KN |
4642 | /* Simple procedure calls |
4643 | */ | |
4644 | ||
4645 | SCM | |
4646 | scm_call_0 (SCM proc) | |
4647 | { | |
4648 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4649 | } | |
4650 | ||
4651 | SCM | |
4652 | scm_call_1 (SCM proc, SCM arg1) | |
4653 | { | |
4654 | return scm_apply (proc, arg1, scm_listofnull); | |
4655 | } | |
4656 | ||
4657 | SCM | |
4658 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4659 | { | |
4660 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4661 | } | |
4662 | ||
4663 | SCM | |
4664 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4665 | { | |
4666 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4667 | } | |
4668 | ||
d95c0b76 NJ |
4669 | SCM |
4670 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4671 | { | |
4672 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4673 | scm_cons (arg4, scm_listofnull))); | |
4674 | } | |
4675 | ||
fdc28395 KN |
4676 | /* Simple procedure applies |
4677 | */ | |
4678 | ||
4679 | SCM | |
4680 | scm_apply_0 (SCM proc, SCM args) | |
4681 | { | |
4682 | return scm_apply (proc, args, SCM_EOL); | |
4683 | } | |
4684 | ||
4685 | SCM | |
4686 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4687 | { | |
4688 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4689 | } | |
4690 | ||
4691 | SCM | |
4692 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4693 | { | |
4694 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4695 | } | |
4696 | ||
4697 | SCM | |
4698 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4699 | { | |
4700 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4701 | SCM_EOL); | |
4702 | } | |
4703 | ||
82a2622a | 4704 | /* This code processes the arguments to apply: |
b145c172 JB |
4705 | |
4706 | (apply PROC ARG1 ... ARGS) | |
4707 | ||
82a2622a JB |
4708 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4709 | ... arguments onto the front of ARGS, and returns the resulting | |
4710 | list. Note that ARGS is a list; thus, the argument to this | |
4711 | function is a list whose last element is a list. | |
4712 | ||
4713 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4714 | result. apply:nconc2last takes care of building the list of |
4715 | arguments, given (ARG1 ... ARGS). | |
4716 | ||
82a2622a JB |
4717 | Rather than do new consing, apply:nconc2last destroys its argument. |
4718 | On that topic, this code came into my care with the following | |
4719 | beautifully cryptic comment on that topic: "This will only screw | |
4720 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4721 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4722 | |
3b3b36dd | 4723 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4724 | (SCM lst), |
4725 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4726 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4727 | "@var{args}, and returns the resulting list. Note that\n" | |
4728 | "@var{args} is a list; thus, the argument to this function is\n" | |
4729 | "a list whose last element is a list.\n" | |
4730 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4731 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4732 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4733 | { |
4734 | SCM *lloc; | |
34d19ef6 | 4735 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4736 | lloc = &lst; |
a61f4e0c | 4737 | while (!scm_is_null (SCM_CDR (*lloc))) /* Perhaps should be |
c96d76b8 NJ |
4738 | SCM_NULL_OR_NIL_P, but not |
4739 | needed in 99.99% of cases, | |
4740 | and it could seriously hurt | |
4741 | performance. - Neil */ | |
a23afe53 | 4742 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4743 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4744 | *lloc = SCM_CAR (*lloc); |
4745 | return lst; | |
4746 | } | |
1bbd0b84 | 4747 | #undef FUNC_NAME |
0f2d19dd JB |
4748 | |
4749 | #endif /* !DEVAL */ | |
4750 | ||
6dbd0af5 MD |
4751 | |
4752 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4753 | * It is compiled twice. | |
4754 | */ | |
4755 | ||
0f2d19dd | 4756 | #if 0 |
0f2d19dd | 4757 | SCM |
6e8d25a6 | 4758 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4759 | {} |
4760 | #endif | |
4761 | ||
4762 | #if 0 | |
0f2d19dd | 4763 | SCM |
6e8d25a6 | 4764 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4765 | {} |
0f2d19dd JB |
4766 | #endif |
4767 | ||
1cc91f1b | 4768 | |
82a2622a JB |
4769 | /* Apply a function to a list of arguments. |
4770 | ||
4771 | This function is exported to the Scheme level as taking two | |
4772 | required arguments and a tail argument, as if it were: | |
4773 | (lambda (proc arg1 . args) ...) | |
4774 | Thus, if you just have a list of arguments to pass to a procedure, | |
4775 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4776 | args, pass the first as ARG1, then cons any remaining fixed args | |
4777 | onto the front of your argument list, and pass that as ARGS. */ | |
4778 | ||
0f2d19dd | 4779 | SCM |
1bbd0b84 | 4780 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4781 | { |
0f2d19dd | 4782 | #ifdef DEVAL |
92c2555f MV |
4783 | scm_t_debug_frame debug; |
4784 | scm_t_debug_info debug_vect_body; | |
9de87eea | 4785 | debug.prev = scm_i_last_debug_frame (); |
b7ff98dd | 4786 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4787 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4788 | debug.vect[0].a.proc = proc; |
4789 | debug.vect[0].a.args = SCM_EOL; | |
9de87eea | 4790 | scm_i_set_last_debug_frame (&debug); |
0f2d19dd | 4791 | #else |
434f2f7a | 4792 | if (scm_debug_mode_p) |
0f2d19dd | 4793 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4794 | #endif |
4795 | ||
4796 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4797 | |
4798 | /* If ARGS is the empty list, then we're calling apply with only two | |
4799 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4800 | the case, futz with things so that ARG1 is the first argument to | |
4801 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4802 | rest. |
4803 | ||
4804 | Setting the debug apply frame args this way is pretty messy. | |
4805 | Perhaps we should store arg1 and args directly in the frame as | |
4806 | received, and let scm_frame_arguments unpack them, because that's | |
4807 | a relatively rare operation. This works for now; if the Guile | |
4808 | developer archives are still around, see Mikael's post of | |
4809 | 11-Apr-97. */ | |
a61f4e0c | 4810 | if (scm_is_null (args)) |
0f2d19dd | 4811 | { |
a61f4e0c | 4812 | if (scm_is_null (arg1)) |
30000774 JB |
4813 | { |
4814 | arg1 = SCM_UNDEFINED; | |
4815 | #ifdef DEVAL | |
4816 | debug.vect[0].a.args = SCM_EOL; | |
4817 | #endif | |
4818 | } | |
0f2d19dd JB |
4819 | else |
4820 | { | |
30000774 JB |
4821 | #ifdef DEVAL |
4822 | debug.vect[0].a.args = arg1; | |
4823 | #endif | |
0f2d19dd JB |
4824 | args = SCM_CDR (arg1); |
4825 | arg1 = SCM_CAR (arg1); | |
4826 | } | |
4827 | } | |
4828 | else | |
4829 | { | |
0f2d19dd | 4830 | args = scm_nconc2last (args); |
30000774 JB |
4831 | #ifdef DEVAL |
4832 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4833 | #endif | |
0f2d19dd | 4834 | } |
0f2d19dd | 4835 | #ifdef DEVAL |
b6d75948 | 4836 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 | 4837 | { |
7c9c0169 | 4838 | SCM tmp = scm_make_debugobj (&debug); |
d95c0b76 NJ |
4839 | SCM_TRAPS_P = 0; |
4840 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4841 | SCM_TRAPS_P = 1; | |
6dbd0af5 | 4842 | } |
6dbd0af5 MD |
4843 | ENTER_APPLY; |
4844 | #endif | |
6dbd0af5 | 4845 | tail: |
0f2d19dd JB |
4846 | switch (SCM_TYP7 (proc)) |
4847 | { | |
4848 | case scm_tc7_subr_2o: | |
a61f4e0c | 4849 | args = scm_is_null (args) ? SCM_UNDEFINED : SCM_CAR (args); |
ddea3325 | 4850 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4851 | case scm_tc7_subr_2: |
a61f4e0c | 4852 | if (scm_is_null (args) || !scm_is_null (SCM_CDR (args))) |
ab1f1094 | 4853 | scm_wrong_num_args (proc); |
0f2d19dd | 4854 | args = SCM_CAR (args); |
ddea3325 | 4855 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4856 | case scm_tc7_subr_0: |
ab1f1094 DH |
4857 | if (!SCM_UNBNDP (arg1)) |
4858 | scm_wrong_num_args (proc); | |
4859 | else | |
4860 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4861 | case scm_tc7_subr_1: |
ab1f1094 DH |
4862 | if (SCM_UNBNDP (arg1)) |
4863 | scm_wrong_num_args (proc); | |
0f2d19dd | 4864 | case scm_tc7_subr_1o: |
a61f4e0c | 4865 | if (!scm_is_null (args)) |
ab1f1094 DH |
4866 | scm_wrong_num_args (proc); |
4867 | else | |
4868 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4869 | case scm_tc7_dsubr: |
a61f4e0c | 4870 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
14b18ed6 | 4871 | scm_wrong_num_args (proc); |
e11e83f3 | 4872 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4873 | { |
d9a67fc4 | 4874 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4875 | } |
4876 | else if (SCM_REALP (arg1)) | |
4877 | { | |
d9a67fc4 | 4878 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4879 | } |
4880 | else if (SCM_BIGP (arg1)) | |
f92e85f7 | 4881 | { |
d9a67fc4 | 4882 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
4883 | } |
4884 | else if (SCM_FRACTIONP (arg1)) | |
4885 | { | |
d9a67fc4 | 4886 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 4887 | } |
14b18ed6 | 4888 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 4889 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
0f2d19dd | 4890 | case scm_tc7_cxr: |
a61f4e0c | 4891 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
ab1f1094 | 4892 | scm_wrong_num_args (proc); |
a61f4e0c | 4893 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
0f2d19dd | 4894 | case scm_tc7_subr_3: |
a61f4e0c MV |
4895 | if (scm_is_null (args) |
4896 | || scm_is_null (SCM_CDR (args)) | |
4897 | || !scm_is_null (SCM_CDDR (args))) | |
ab1f1094 DH |
4898 | scm_wrong_num_args (proc); |
4899 | else | |
4900 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4901 | case scm_tc7_lsubr: |
4902 | #ifdef DEVAL | |
ddea3325 | 4903 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4904 | #else |
ddea3325 | 4905 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4906 | #endif |
4907 | case scm_tc7_lsubr_2: | |
a61f4e0c | 4908 | if (!scm_is_pair (args)) |
ab1f1094 DH |
4909 | scm_wrong_num_args (proc); |
4910 | else | |
4911 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd | 4912 | case scm_tc7_asubr: |
a61f4e0c | 4913 | if (scm_is_null (args)) |
ddea3325 | 4914 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4915 | while (SCM_NIMP (args)) |
4916 | { | |
a61f4e0c | 4917 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
0f2d19dd JB |
4918 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); |
4919 | args = SCM_CDR (args); | |
4920 | } | |
4921 | RETURN (arg1); | |
4922 | case scm_tc7_rpsubr: | |
a61f4e0c | 4923 | if (scm_is_null (args)) |
0f2d19dd JB |
4924 | RETURN (SCM_BOOL_T); |
4925 | while (SCM_NIMP (args)) | |
4926 | { | |
a61f4e0c | 4927 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
7888309b | 4928 | if (scm_is_false (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) |
0f2d19dd JB |
4929 | RETURN (SCM_BOOL_F); |
4930 | arg1 = SCM_CAR (args); | |
4931 | args = SCM_CDR (args); | |
4932 | } | |
4933 | RETURN (SCM_BOOL_T); | |
4934 | case scm_tcs_closures: | |
4935 | #ifdef DEVAL | |
6dbd0af5 | 4936 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4937 | #else |
4938 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4939 | #endif | |
726d810a | 4940 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4941 | scm_wrong_num_args (proc); |
1609038c MD |
4942 | |
4943 | /* Copy argument list */ | |
4944 | if (SCM_IMP (arg1)) | |
4945 | args = arg1; | |
4946 | else | |
4947 | { | |
4948 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
a61f4e0c | 4949 | for (arg1 = SCM_CDR (arg1); scm_is_pair (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4950 | { |
05b15362 | 4951 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4952 | tl = SCM_CDR (tl); |
4953 | } | |
4954 | SCM_SETCDR (tl, arg1); | |
4955 | } | |
4956 | ||
821f18a4 DH |
4957 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4958 | args, | |
4959 | SCM_ENV (proc)); | |
f9450cdb | 4960 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4961 | again: |
05b15362 | 4962 | arg1 = SCM_CDR (proc); |
a61f4e0c | 4963 | while (!scm_is_null (arg1)) |
2ddb0920 MD |
4964 | { |
4965 | if (SCM_IMP (SCM_CAR (proc))) | |
4966 | { | |
4967 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4968 | { | |
9de87eea | 4969 | scm_i_scm_pthread_mutex_lock (&source_mutex); |
9bc4701c MD |
4970 | /* check for race condition */ |
4971 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4972 | m_expand_body (proc, args); |
9de87eea | 4973 | scm_i_pthread_mutex_unlock (&source_mutex); |
e791c18f | 4974 | goto again; |
2ddb0920 | 4975 | } |
5280aaca | 4976 | else |
17fa3fcf | 4977 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4978 | } |
4979 | else | |
b1cb24ff | 4980 | (void) EVAL (SCM_CAR (proc), args); |
e791c18f | 4981 | proc = arg1; |
05b15362 | 4982 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4983 | } |
e791c18f | 4984 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4985 | case scm_tc7_smob: |
68b06924 | 4986 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4987 | goto badproc; |
afa38f6e | 4988 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4989 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
a61f4e0c | 4990 | else if (scm_is_null (args)) |
ddea3325 | 4991 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
a61f4e0c | 4992 | else if (scm_is_null (SCM_CDR (args))) |
ddea3325 | 4993 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4994 | else |
68b06924 | 4995 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4996 | case scm_tc7_cclo: |
4997 | #ifdef DEVAL | |
6dbd0af5 MD |
4998 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4999 | arg1 = proc; | |
5000 | proc = SCM_CCLO_SUBR (proc); | |
5001 | debug.vect[0].a.proc = proc; | |
5002 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
5003 | #else |
5004 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
5005 | arg1 = proc; |
5006 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 5007 | #endif |
0f2d19dd | 5008 | goto tail; |
89efbff4 MD |
5009 | case scm_tc7_pws: |
5010 | proc = SCM_PROCEDURE (proc); | |
5011 | #ifdef DEVAL | |
5012 | debug.vect[0].a.proc = proc; | |
5013 | #endif | |
5014 | goto tail; | |
904a077d | 5015 | case scm_tcs_struct: |
f3d2630a MD |
5016 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
5017 | { | |
5018 | #ifdef DEVAL | |
5019 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
5020 | #else | |
5021 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
5022 | #endif | |
195847fa | 5023 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 5024 | } |
2ca0d207 | 5025 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 5026 | { |
504d99c5 | 5027 | /* operator */ |
da7f71d7 MD |
5028 | #ifdef DEVAL |
5029 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
5030 | #else | |
5031 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
5032 | #endif | |
5033 | arg1 = proc; | |
195847fa MD |
5034 | proc = (SCM_I_ENTITYP (proc) |
5035 | ? SCM_ENTITY_PROCEDURE (proc) | |
5036 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
5037 | #ifdef DEVAL |
5038 | debug.vect[0].a.proc = proc; | |
5039 | debug.vect[0].a.args = scm_cons (arg1, args); | |
5040 | #endif | |
195847fa MD |
5041 | if (SCM_NIMP (proc)) |
5042 | goto tail; | |
5043 | else | |
5044 | goto badproc; | |
da7f71d7 | 5045 | } |
2ca0d207 DH |
5046 | else |
5047 | goto badproc; | |
0f2d19dd JB |
5048 | default: |
5049 | badproc: | |
db4b4ca6 | 5050 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
5051 | } |
5052 | #ifdef DEVAL | |
6dbd0af5 | 5053 | exit: |
5132eef0 | 5054 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 5055 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 5056 | { |
b7ff98dd | 5057 | SCM_CLEAR_TRACED_FRAME (debug); |
7c9c0169 | 5058 | arg1 = scm_make_debugobj (&debug); |
d95c0b76 | 5059 | SCM_TRAPS_P = 0; |
7c9c0169 | 5060 | arg1 = scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 5061 | SCM_TRAPS_P = 1; |
7c9c0169 NJ |
5062 | if (scm_is_pair (arg1) && scm_is_eq (SCM_CAR (arg1), sym_instead)) |
5063 | proc = SCM_CDR (arg1); | |
6dbd0af5 | 5064 | } |
9de87eea | 5065 | scm_i_set_last_debug_frame (debug.prev); |
0f2d19dd JB |
5066 | return proc; |
5067 | #endif | |
5068 | } | |
5069 | ||
6dbd0af5 MD |
5070 | |
5071 | /* SECTION: The rest of this file is only read once. | |
5072 | */ | |
5073 | ||
0f2d19dd JB |
5074 | #ifndef DEVAL |
5075 | ||
504d99c5 MD |
5076 | /* Trampolines |
5077 | * | |
5078 | * Trampolines make it possible to move procedure application dispatch | |
5079 | * outside inner loops. The motivation was clean implementation of | |
5080 | * efficient replacements of R5RS primitives in SRFI-1. | |
5081 | * | |
5082 | * The semantics is clear: scm_trampoline_N returns an optimized | |
5083 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
5084 | * on N args). | |
5085 | * | |
5086 | * Applying the optimization to map and for-each increased efficiency | |
5087 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
5088 | * before. | |
5089 | */ | |
5090 | ||
756414cf MD |
5091 | static SCM |
5092 | call_subr0_0 (SCM proc) | |
5093 | { | |
5094 | return SCM_SUBRF (proc) (); | |
5095 | } | |
5096 | ||
5097 | static SCM | |
5098 | call_subr1o_0 (SCM proc) | |
5099 | { | |
5100 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
5101 | } | |
5102 | ||
5103 | static SCM | |
5104 | call_lsubr_0 (SCM proc) | |
5105 | { | |
5106 | return SCM_SUBRF (proc) (SCM_EOL); | |
5107 | } | |
5108 | ||
5109 | SCM | |
5110 | scm_i_call_closure_0 (SCM proc) | |
5111 | { | |
6a3f13f0 DH |
5112 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5113 | SCM_EOL, | |
5114 | SCM_ENV (proc)); | |
5115 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5116 | return result; |
756414cf MD |
5117 | } |
5118 | ||
5119 | scm_t_trampoline_0 | |
5120 | scm_trampoline_0 (SCM proc) | |
5121 | { | |
2510c810 DH |
5122 | scm_t_trampoline_0 trampoline; |
5123 | ||
756414cf | 5124 | if (SCM_IMP (proc)) |
d0b07b5d | 5125 | return NULL; |
2510c810 | 5126 | |
756414cf MD |
5127 | switch (SCM_TYP7 (proc)) |
5128 | { | |
5129 | case scm_tc7_subr_0: | |
2510c810 DH |
5130 | trampoline = call_subr0_0; |
5131 | break; | |
756414cf | 5132 | case scm_tc7_subr_1o: |
2510c810 DH |
5133 | trampoline = call_subr1o_0; |
5134 | break; | |
756414cf | 5135 | case scm_tc7_lsubr: |
2510c810 DH |
5136 | trampoline = call_lsubr_0; |
5137 | break; | |
756414cf MD |
5138 | case scm_tcs_closures: |
5139 | { | |
5140 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 5141 | if (scm_is_null (formals) || !scm_is_pair (formals)) |
2510c810 | 5142 | trampoline = scm_i_call_closure_0; |
756414cf | 5143 | else |
d0b07b5d | 5144 | return NULL; |
2510c810 | 5145 | break; |
756414cf MD |
5146 | } |
5147 | case scm_tcs_struct: | |
5148 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5149 | trampoline = scm_call_generic_0; |
2ca0d207 | 5150 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5151 | trampoline = scm_call_0; |
5152 | else | |
5153 | return NULL; | |
5154 | break; | |
756414cf MD |
5155 | case scm_tc7_smob: |
5156 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5157 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 5158 | else |
d0b07b5d | 5159 | return NULL; |
2510c810 | 5160 | break; |
756414cf MD |
5161 | case scm_tc7_asubr: |
5162 | case scm_tc7_rpsubr: | |
5163 | case scm_tc7_cclo: | |
5164 | case scm_tc7_pws: | |
2510c810 DH |
5165 | trampoline = scm_call_0; |
5166 | break; | |
756414cf | 5167 | default: |
2510c810 | 5168 | return NULL; /* not applicable on zero arguments */ |
756414cf | 5169 | } |
2510c810 DH |
5170 | /* We only reach this point if a valid trampoline was determined. */ |
5171 | ||
5172 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5173 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
434f2f7a | 5174 | if (scm_debug_mode_p) |
2510c810 DH |
5175 | return scm_call_0; |
5176 | else | |
5177 | return trampoline; | |
756414cf MD |
5178 | } |
5179 | ||
504d99c5 MD |
5180 | static SCM |
5181 | call_subr1_1 (SCM proc, SCM arg1) | |
5182 | { | |
5183 | return SCM_SUBRF (proc) (arg1); | |
5184 | } | |
5185 | ||
9ed24633 MD |
5186 | static SCM |
5187 | call_subr2o_1 (SCM proc, SCM arg1) | |
5188 | { | |
5189 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
5190 | } | |
5191 | ||
504d99c5 MD |
5192 | static SCM |
5193 | call_lsubr_1 (SCM proc, SCM arg1) | |
5194 | { | |
5195 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
5196 | } | |
5197 | ||
5198 | static SCM | |
5199 | call_dsubr_1 (SCM proc, SCM arg1) | |
5200 | { | |
e11e83f3 | 5201 | if (SCM_I_INUMP (arg1)) |
504d99c5 | 5202 | { |
d9a67fc4 | 5203 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
504d99c5 MD |
5204 | } |
5205 | else if (SCM_REALP (arg1)) | |
5206 | { | |
d9a67fc4 | 5207 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
504d99c5 | 5208 | } |
504d99c5 | 5209 | else if (SCM_BIGP (arg1)) |
f92e85f7 | 5210 | { |
d9a67fc4 | 5211 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
5212 | } |
5213 | else if (SCM_FRACTIONP (arg1)) | |
5214 | { | |
d9a67fc4 | 5215 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 5216 | } |
504d99c5 | 5217 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 5218 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
504d99c5 MD |
5219 | } |
5220 | ||
5221 | static SCM | |
5222 | call_cxr_1 (SCM proc, SCM arg1) | |
5223 | { | |
a61f4e0c | 5224 | return scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc)); |
504d99c5 MD |
5225 | } |
5226 | ||
5227 | static SCM | |
5228 | call_closure_1 (SCM proc, SCM arg1) | |
5229 | { | |
6a3f13f0 DH |
5230 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5231 | scm_list_1 (arg1), | |
5232 | SCM_ENV (proc)); | |
5233 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5234 | return result; |
504d99c5 MD |
5235 | } |
5236 | ||
5237 | scm_t_trampoline_1 | |
5238 | scm_trampoline_1 (SCM proc) | |
5239 | { | |
2510c810 DH |
5240 | scm_t_trampoline_1 trampoline; |
5241 | ||
504d99c5 | 5242 | if (SCM_IMP (proc)) |
d0b07b5d | 5243 | return NULL; |
2510c810 | 5244 | |
504d99c5 MD |
5245 | switch (SCM_TYP7 (proc)) |
5246 | { | |
5247 | case scm_tc7_subr_1: | |
5248 | case scm_tc7_subr_1o: | |
2510c810 DH |
5249 | trampoline = call_subr1_1; |
5250 | break; | |
9ed24633 | 5251 | case scm_tc7_subr_2o: |
2510c810 DH |
5252 | trampoline = call_subr2o_1; |
5253 | break; | |
504d99c5 | 5254 | case scm_tc7_lsubr: |
2510c810 DH |
5255 | trampoline = call_lsubr_1; |
5256 | break; | |
14b18ed6 | 5257 | case scm_tc7_dsubr: |
2510c810 DH |
5258 | trampoline = call_dsubr_1; |
5259 | break; | |
504d99c5 | 5260 | case scm_tc7_cxr: |
2510c810 DH |
5261 | trampoline = call_cxr_1; |
5262 | break; | |
504d99c5 MD |
5263 | case scm_tcs_closures: |
5264 | { | |
5265 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5266 | if (!scm_is_null (formals) |
5267 | && (!scm_is_pair (formals) || !scm_is_pair (SCM_CDR (formals)))) | |
2510c810 | 5268 | trampoline = call_closure_1; |
504d99c5 | 5269 | else |
d0b07b5d | 5270 | return NULL; |
2510c810 | 5271 | break; |
504d99c5 MD |
5272 | } |
5273 | case scm_tcs_struct: | |
5274 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5275 | trampoline = scm_call_generic_1; |
2ca0d207 | 5276 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5277 | trampoline = scm_call_1; |
5278 | else | |
5279 | return NULL; | |
5280 | break; | |
504d99c5 MD |
5281 | case scm_tc7_smob: |
5282 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5283 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 5284 | else |
d0b07b5d | 5285 | return NULL; |
2510c810 | 5286 | break; |
504d99c5 MD |
5287 | case scm_tc7_asubr: |
5288 | case scm_tc7_rpsubr: | |
5289 | case scm_tc7_cclo: | |
5290 | case scm_tc7_pws: | |
2510c810 DH |
5291 | trampoline = scm_call_1; |
5292 | break; | |
504d99c5 | 5293 | default: |
d0b07b5d | 5294 | return NULL; /* not applicable on one arg */ |
504d99c5 | 5295 | } |
2510c810 DH |
5296 | /* We only reach this point if a valid trampoline was determined. */ |
5297 | ||
5298 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5299 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
434f2f7a | 5300 | if (scm_debug_mode_p) |
2510c810 DH |
5301 | return scm_call_1; |
5302 | else | |
5303 | return trampoline; | |
504d99c5 MD |
5304 | } |
5305 | ||
5306 | static SCM | |
5307 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5308 | { | |
5309 | return SCM_SUBRF (proc) (arg1, arg2); | |
5310 | } | |
5311 | ||
9ed24633 MD |
5312 | static SCM |
5313 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5314 | { | |
5315 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
5316 | } | |
5317 | ||
504d99c5 MD |
5318 | static SCM |
5319 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
5320 | { | |
5321 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
5322 | } | |
5323 | ||
5324 | static SCM | |
5325 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
5326 | { | |
6a3f13f0 DH |
5327 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5328 | scm_list_2 (arg1, arg2), | |
5329 | SCM_ENV (proc)); | |
5330 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5331 | return result; |
504d99c5 MD |
5332 | } |
5333 | ||
5334 | scm_t_trampoline_2 | |
5335 | scm_trampoline_2 (SCM proc) | |
5336 | { | |
2510c810 DH |
5337 | scm_t_trampoline_2 trampoline; |
5338 | ||
504d99c5 | 5339 | if (SCM_IMP (proc)) |
d0b07b5d | 5340 | return NULL; |
2510c810 | 5341 | |
504d99c5 MD |
5342 | switch (SCM_TYP7 (proc)) |
5343 | { | |
5344 | case scm_tc7_subr_2: | |
5345 | case scm_tc7_subr_2o: | |
5346 | case scm_tc7_rpsubr: | |
5347 | case scm_tc7_asubr: | |
2510c810 DH |
5348 | trampoline = call_subr2_2; |
5349 | break; | |
9ed24633 | 5350 | case scm_tc7_lsubr_2: |
2510c810 DH |
5351 | trampoline = call_lsubr2_2; |
5352 | break; | |
504d99c5 | 5353 | case scm_tc7_lsubr: |
2510c810 DH |
5354 | trampoline = call_lsubr_2; |
5355 | break; | |
504d99c5 MD |
5356 | case scm_tcs_closures: |
5357 | { | |
5358 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5359 | if (!scm_is_null (formals) |
5360 | && (!scm_is_pair (formals) | |
5361 | || (!scm_is_null (SCM_CDR (formals)) | |
5362 | && (!scm_is_pair (SCM_CDR (formals)) | |
5363 | || !scm_is_pair (SCM_CDDR (formals)))))) | |
2510c810 | 5364 | trampoline = call_closure_2; |
504d99c5 | 5365 | else |
d0b07b5d | 5366 | return NULL; |
2510c810 | 5367 | break; |
504d99c5 MD |
5368 | } |
5369 | case scm_tcs_struct: | |
5370 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5371 | trampoline = scm_call_generic_2; |
2ca0d207 | 5372 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5373 | trampoline = scm_call_2; |
5374 | else | |
5375 | return NULL; | |
5376 | break; | |
504d99c5 MD |
5377 | case scm_tc7_smob: |
5378 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5379 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5380 | else |
d0b07b5d | 5381 | return NULL; |
2510c810 | 5382 | break; |
504d99c5 MD |
5383 | case scm_tc7_cclo: |
5384 | case scm_tc7_pws: | |
2510c810 DH |
5385 | trampoline = scm_call_2; |
5386 | break; | |
504d99c5 | 5387 | default: |
d0b07b5d | 5388 | return NULL; /* not applicable on two args */ |
504d99c5 | 5389 | } |
2510c810 DH |
5390 | /* We only reach this point if a valid trampoline was determined. */ |
5391 | ||
5392 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5393 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
434f2f7a | 5394 | if (scm_debug_mode_p) |
2510c810 DH |
5395 | return scm_call_2; |
5396 | else | |
5397 | return trampoline; | |
504d99c5 MD |
5398 | } |
5399 | ||
d9c393f5 JB |
5400 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5401 | ||
47c3f06d | 5402 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5403 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5404 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5405 | static inline void |
47c3f06d | 5406 | check_map_args (SCM argv, |
c014a02e | 5407 | long len, |
47c3f06d MD |
5408 | SCM gf, |
5409 | SCM proc, | |
5410 | SCM args, | |
5411 | const char *who) | |
d9c393f5 | 5412 | { |
c014a02e | 5413 | long i; |
d9c393f5 | 5414 | |
4057a3e0 | 5415 | for (i = SCM_SIMPLE_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5416 | { |
4057a3e0 MV |
5417 | SCM elt = SCM_SIMPLE_VECTOR_REF (argv, i); |
5418 | long elt_len = scm_ilength (elt); | |
d9c393f5 JB |
5419 | |
5420 | if (elt_len < 0) | |
47c3f06d MD |
5421 | { |
5422 | if (gf) | |
5423 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5424 | else | |
4057a3e0 | 5425 | scm_wrong_type_arg (who, i + 2, elt); |
47c3f06d | 5426 | } |
d9c393f5 JB |
5427 | |
5428 | if (elt_len != len) | |
4057a3e0 | 5429 | scm_out_of_range_pos (who, elt, scm_from_long (i + 2)); |
d9c393f5 | 5430 | } |
d9c393f5 JB |
5431 | } |
5432 | ||
5433 | ||
47c3f06d | 5434 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5435 | |
368bf056 MD |
5436 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5437 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5438 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5439 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5440 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5441 | */ |
5442 | ||
0f2d19dd | 5443 | SCM |
1bbd0b84 | 5444 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5445 | #define FUNC_NAME s_map |
0f2d19dd | 5446 | { |
c014a02e | 5447 | long i, len; |
0f2d19dd JB |
5448 | SCM res = SCM_EOL; |
5449 | SCM *pres = &res; | |
0f2d19dd | 5450 | |
d9c393f5 | 5451 | len = scm_ilength (arg1); |
47c3f06d MD |
5452 | SCM_GASSERTn (len >= 0, |
5453 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5454 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5455 | if (scm_is_null (args)) |
0f2d19dd | 5456 | { |
504d99c5 MD |
5457 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5458 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5459 | while (SCM_NIMP (arg1)) | |
5460 | { | |
5461 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5462 | pres = SCM_CDRLOC (*pres); | |
5463 | arg1 = SCM_CDR (arg1); | |
5464 | } | |
5465 | return res; | |
5466 | } | |
a61f4e0c | 5467 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5468 | { |
5469 | SCM arg2 = SCM_CAR (args); | |
5470 | int len2 = scm_ilength (arg2); | |
5471 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5472 | SCM_GASSERTn (call, | |
5473 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5474 | SCM_GASSERTn (len2 >= 0, | |
5475 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5476 | if (len2 != len) | |
5477 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5478 | while (SCM_NIMP (arg1)) |
5479 | { | |
504d99c5 | 5480 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5481 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5482 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5483 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5484 | } |
5485 | return res; | |
5486 | } | |
05b15362 DH |
5487 | arg1 = scm_cons (arg1, args); |
5488 | args = scm_vector (arg1); | |
47c3f06d | 5489 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5490 | while (1) |
5491 | { | |
5492 | arg1 = SCM_EOL; | |
4057a3e0 | 5493 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5494 | { |
4057a3e0 MV |
5495 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5496 | if (SCM_IMP (elt)) | |
d9c393f5 | 5497 | return res; |
4057a3e0 MV |
5498 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5499 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd | 5500 | } |
8ea46249 | 5501 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5502 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5503 | } |
5504 | } | |
af45e3b0 | 5505 | #undef FUNC_NAME |
0f2d19dd JB |
5506 | |
5507 | ||
47c3f06d | 5508 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5509 | |
0f2d19dd | 5510 | SCM |
1bbd0b84 | 5511 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5512 | #define FUNC_NAME s_for_each |
0f2d19dd | 5513 | { |
c014a02e | 5514 | long i, len; |
d9c393f5 | 5515 | len = scm_ilength (arg1); |
47c3f06d MD |
5516 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5517 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5518 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5519 | if (scm_is_null (args)) |
0f2d19dd | 5520 | { |
504d99c5 MD |
5521 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5522 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5523 | while (SCM_NIMP (arg1)) | |
5524 | { | |
5525 | call (proc, SCM_CAR (arg1)); | |
5526 | arg1 = SCM_CDR (arg1); | |
5527 | } | |
5528 | return SCM_UNSPECIFIED; | |
5529 | } | |
a61f4e0c | 5530 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5531 | { |
5532 | SCM arg2 = SCM_CAR (args); | |
5533 | int len2 = scm_ilength (arg2); | |
5534 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5535 | SCM_GASSERTn (call, g_for_each, | |
5536 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5537 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5538 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5539 | if (len2 != len) | |
5540 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5541 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5542 | { |
504d99c5 | 5543 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5544 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5545 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5546 | } |
5547 | return SCM_UNSPECIFIED; | |
5548 | } | |
05b15362 DH |
5549 | arg1 = scm_cons (arg1, args); |
5550 | args = scm_vector (arg1); | |
47c3f06d | 5551 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5552 | while (1) |
5553 | { | |
5554 | arg1 = SCM_EOL; | |
4057a3e0 | 5555 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5556 | { |
4057a3e0 MV |
5557 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5558 | if (SCM_IMP (elt)) | |
c96d76b8 | 5559 | return SCM_UNSPECIFIED; |
4057a3e0 MV |
5560 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5561 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd JB |
5562 | } |
5563 | scm_apply (proc, arg1, SCM_EOL); | |
5564 | } | |
5565 | } | |
af45e3b0 | 5566 | #undef FUNC_NAME |
0f2d19dd | 5567 | |
1cc91f1b | 5568 | |
0f2d19dd | 5569 | SCM |
6e8d25a6 | 5570 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5571 | { |
16d4699b MV |
5572 | SCM z; |
5573 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5574 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5575 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5576 | return z; |
5577 | } | |
5578 | ||
5579 | ||
92c2555f | 5580 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5581 | |
0f2d19dd | 5582 | SCM |
6e8d25a6 | 5583 | scm_makprom (SCM code) |
0f2d19dd | 5584 | { |
28d52ebb MD |
5585 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5586 | SCM_UNPACK (code), | |
9de87eea MV |
5587 | scm_make_recursive_mutex ()); |
5588 | } | |
5589 | ||
5590 | static SCM | |
5591 | promise_mark (SCM promise) | |
5592 | { | |
5593 | scm_gc_mark (SCM_PROMISE_MUTEX (promise)); | |
5594 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd JB |
5595 | } |
5596 | ||
28d52ebb MD |
5597 | static size_t |
5598 | promise_free (SCM promise) | |
5599 | { | |
28d52ebb MD |
5600 | return 0; |
5601 | } | |
1cc91f1b | 5602 | |
0f2d19dd | 5603 | static int |
e841c3e0 | 5604 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5605 | { |
19402679 | 5606 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5607 | scm_puts ("#<promise ", port); |
19402679 | 5608 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5609 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5610 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5611 | scm_putc ('>', port); |
0f2d19dd JB |
5612 | return !0; |
5613 | } | |
5614 | ||
3b3b36dd | 5615 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5616 | (SCM promise), |
67e8151b MG |
5617 | "If the promise @var{x} has not been computed yet, compute and\n" |
5618 | "return @var{x}, otherwise just return the previously computed\n" | |
5619 | "value.") | |
1bbd0b84 | 5620 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5621 | { |
28d52ebb | 5622 | SCM_VALIDATE_SMOB (1, promise, promise); |
9de87eea | 5623 | scm_lock_mutex (SCM_PROMISE_MUTEX (promise)); |
28d52ebb | 5624 | if (!SCM_PROMISE_COMPUTED_P (promise)) |
0f2d19dd | 5625 | { |
28d52ebb MD |
5626 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5627 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5628 | { |
28d52ebb MD |
5629 | SCM_SET_PROMISE_DATA (promise, ans); |
5630 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5631 | } |
5632 | } | |
9de87eea | 5633 | scm_unlock_mutex (SCM_PROMISE_MUTEX (promise)); |
28d52ebb | 5634 | return SCM_PROMISE_DATA (promise); |
0f2d19dd | 5635 | } |
1bbd0b84 | 5636 | #undef FUNC_NAME |
0f2d19dd | 5637 | |
445f675c | 5638 | |
a1ec6916 | 5639 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5640 | (SCM obj), |
b380b885 | 5641 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5642 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5643 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5644 | { |
7888309b | 5645 | return scm_from_bool (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5646 | } |
1bbd0b84 | 5647 | #undef FUNC_NAME |
0f2d19dd | 5648 | |
445f675c | 5649 | |
a1ec6916 | 5650 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5651 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5652 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5653 | "Any source properties associated with @var{xorig} are also associated\n" | |
5654 | "with the new pair.") | |
1bbd0b84 | 5655 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5656 | { |
5657 | SCM p, z; | |
16d4699b | 5658 | z = scm_cons (x, y); |
26d5b9b4 MD |
5659 | /* Copy source properties possibly associated with xorig. */ |
5660 | p = scm_whash_lookup (scm_source_whash, xorig); | |
7888309b | 5661 | if (scm_is_true (p)) |
26d5b9b4 MD |
5662 | scm_whash_insert (scm_source_whash, z, p); |
5663 | return z; | |
5664 | } | |
1bbd0b84 | 5665 | #undef FUNC_NAME |
26d5b9b4 | 5666 | |
445f675c | 5667 | |
62360b89 DH |
5668 | /* The function scm_copy_tree is used to copy an expression tree to allow the |
5669 | * memoizer to modify the expression during memoization. scm_copy_tree | |
5670 | * creates deep copies of pairs and vectors, but not of any other data types, | |
5671 | * since only pairs and vectors will be parsed by the memoizer. | |
5672 | * | |
5673 | * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise | |
5674 | * pattern is used to detect cycles. In fact, the pattern is used in two | |
5675 | * dimensions, vertical (indicated in the code by the variable names 'hare' | |
5676 | * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both | |
5677 | * dimensions, the hare/rabbit will take two steps when the tortoise/turtle | |
5678 | * takes one. | |
5679 | * | |
5680 | * The vertical dimension corresponds to recursive calls to function | |
5681 | * copy_tree: This happens when descending into vector elements, into cars of | |
5682 | * lists and into the cdr of an improper list. In this dimension, the | |
5683 | * tortoise follows the hare by using the processor stack: Every stack frame | |
5684 | * will hold an instance of struct t_trace. These instances are connected in | |
5685 | * a way that represents the trace of the hare, which thus can be followed by | |
5686 | * the tortoise. The tortoise will always point to struct t_trace instances | |
5687 | * relating to SCM objects that have already been copied. Thus, a cycle is | |
5688 | * detected if the tortoise and the hare point to the same object, | |
5689 | * | |
5690 | * The horizontal dimension is within one execution of copy_tree, when the | |
5691 | * function cdr's along the pairs of a list. This is the standard | |
5692 | * hare-and-tortoise implementation, found several times in guile. */ | |
5693 | ||
5694 | struct t_trace { | |
5695 | struct t_trace *trace; // These pointers form a trace along the stack. | |
5696 | SCM obj; // The object handled at the respective stack frame. | |
5697 | }; | |
5698 | ||
5699 | static SCM | |
5700 | copy_tree ( | |
5701 | struct t_trace *const hare, | |
5702 | struct t_trace *tortoise, | |
5703 | unsigned int tortoise_delay ) | |
5704 | { | |
4057a3e0 | 5705 | if (!scm_is_pair (hare->obj) && !scm_is_simple_vector (hare->obj)) |
62360b89 DH |
5706 | { |
5707 | return hare->obj; | |
5708 | } | |
5709 | else | |
5710 | { | |
5711 | /* Prepare the trace along the stack. */ | |
5712 | struct t_trace new_hare; | |
5713 | hare->trace = &new_hare; | |
5714 | ||
5715 | /* The tortoise will make its step after the delay has elapsed. Note | |
5716 | * that in contrast to the typical hare-and-tortoise pattern, the step | |
5717 | * of the tortoise happens before the hare takes its steps. This is, in | |
5718 | * principle, no problem, except for the start of the algorithm: Then, | |
5fb64383 | 5719 | * it has to be made sure that the hare actually gets its advantage of |
62360b89 DH |
5720 | * two steps. */ |
5721 | if (tortoise_delay == 0) | |
5722 | { | |
5723 | tortoise_delay = 1; | |
5724 | tortoise = tortoise->trace; | |
bc36d050 | 5725 | ASSERT_SYNTAX (!scm_is_eq (hare->obj, tortoise->obj), |
62360b89 DH |
5726 | s_bad_expression, hare->obj); |
5727 | } | |
5728 | else | |
5729 | { | |
5730 | --tortoise_delay; | |
5731 | } | |
5732 | ||
4057a3e0 | 5733 | if (scm_is_simple_vector (hare->obj)) |
62360b89 | 5734 | { |
4057a3e0 MV |
5735 | size_t length = SCM_SIMPLE_VECTOR_LENGTH (hare->obj); |
5736 | SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED); | |
62360b89 DH |
5737 | |
5738 | /* Each vector element is copied by recursing into copy_tree, having | |
5739 | * the tortoise follow the hare into the depths of the stack. */ | |
5740 | unsigned long int i; | |
5741 | for (i = 0; i < length; ++i) | |
5742 | { | |
5743 | SCM new_element; | |
4057a3e0 | 5744 | new_hare.obj = SCM_SIMPLE_VECTOR_REF (hare->obj, i); |
62360b89 | 5745 | new_element = copy_tree (&new_hare, tortoise, tortoise_delay); |
4057a3e0 | 5746 | SCM_SIMPLE_VECTOR_SET (new_vector, i, new_element); |
62360b89 DH |
5747 | } |
5748 | ||
5749 | return new_vector; | |
5750 | } | |
a61f4e0c | 5751 | else // scm_is_pair (hare->obj) |
62360b89 DH |
5752 | { |
5753 | SCM result; | |
5754 | SCM tail; | |
5755 | ||
5756 | SCM rabbit = hare->obj; | |
5757 | SCM turtle = hare->obj; | |
5758 | ||
5759 | SCM copy; | |
5760 | ||
5761 | /* The first pair of the list is treated specially, in order to | |
5762 | * preserve a potential source code position. */ | |
5763 | result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL); | |
5764 | new_hare.obj = SCM_CAR (rabbit); | |
5765 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5766 | SCM_SETCAR (tail, copy); | |
5767 | ||
5768 | /* The remaining pairs of the list are copied by, horizontally, | |
5769 | * having the turtle follow the rabbit, and, vertically, having the | |
5770 | * tortoise follow the hare into the depths of the stack. */ | |
5771 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5772 | while (scm_is_pair (rabbit)) |
62360b89 DH |
5773 | { |
5774 | new_hare.obj = SCM_CAR (rabbit); | |
5775 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5776 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5777 | tail = SCM_CDR (tail); | |
5778 | ||
5779 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5780 | if (scm_is_pair (rabbit)) |
62360b89 DH |
5781 | { |
5782 | new_hare.obj = SCM_CAR (rabbit); | |
5783 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5784 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5785 | tail = SCM_CDR (tail); | |
5786 | rabbit = SCM_CDR (rabbit); | |
5787 | ||
5788 | turtle = SCM_CDR (turtle); | |
bc36d050 | 5789 | ASSERT_SYNTAX (!scm_is_eq (rabbit, turtle), |
62360b89 DH |
5790 | s_bad_expression, rabbit); |
5791 | } | |
5792 | } | |
5793 | ||
5794 | /* We have to recurse into copy_tree again for the last cdr, in | |
5795 | * order to handle the situation that it holds a vector. */ | |
5796 | new_hare.obj = rabbit; | |
5797 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5798 | SCM_SETCDR (tail, copy); | |
5799 | ||
5800 | return result; | |
5801 | } | |
5802 | } | |
5803 | } | |
5804 | ||
a1ec6916 | 5805 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5806 | (SCM obj), |
b380b885 | 5807 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
bfefbf18 | 5808 | "the new data structure. @code{copy-tree} recurses down the\n" |
b380b885 MD |
5809 | "contents of both pairs and vectors (since both cons cells and vector\n" |
5810 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5811 | "any other object.") | |
1bbd0b84 | 5812 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd | 5813 | { |
62360b89 DH |
5814 | /* Prepare the trace along the stack. */ |
5815 | struct t_trace trace; | |
5816 | trace.obj = obj; | |
5817 | ||
5818 | /* In function copy_tree, if the tortoise makes its step, it will do this | |
5819 | * before the hare has the chance to move. Thus, we have to make sure that | |
5820 | * the very first step of the tortoise will not happen after the hare has | |
5821 | * really made two steps. This is achieved by passing '2' as the initial | |
5822 | * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare | |
5823 | * a bigger advantage may improve performance slightly. */ | |
5824 | return copy_tree (&trace, &trace, 2); | |
0f2d19dd | 5825 | } |
1bbd0b84 | 5826 | #undef FUNC_NAME |
0f2d19dd | 5827 | |
1cc91f1b | 5828 | |
4163eb72 MV |
5829 | /* We have three levels of EVAL here: |
5830 | ||
5831 | - scm_i_eval (exp, env) | |
5832 | ||
5833 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5834 | structure as used by the actual tree code evaluator. When ENV is | |
5835 | a top-level environment, then changes to the current module are | |
a513ead3 | 5836 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5837 | the current module. |
5838 | ||
5839 | - scm_primitive_eval (exp) | |
5840 | ||
5841 | evaluates EXP in the top-level environment as determined by the | |
5842 | current module. This is done by constructing a suitable | |
5843 | environment and calling scm_i_eval. Thus, changes to the | |
5844 | top-level module are tracked normally. | |
5845 | ||
9de87eea | 5846 | - scm_eval (exp, mod_or_state) |
4163eb72 | 5847 | |
9de87eea MV |
5848 | evaluates EXP while MOD_OR_STATE is the current module or current |
5849 | dynamic state (as appropriate). This is done by setting the | |
5850 | current module (or dynamic state) to MOD_OR_STATE, invoking | |
5851 | scm_primitive_eval on EXP, and then restoring the current module | |
5852 | (or dynamic state) to the value it had previously. That is, | |
5853 | while EXP is evaluated, changes to the current module (or dynamic | |
5854 | state) are tracked, but these changes do not persist when | |
4163eb72 MV |
5855 | scm_eval returns. |
5856 | ||
5857 | For each level of evals, there are two variants, distinguished by a | |
5858 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5859 | variant can destructively modify EXP into something completely | |
5860 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5861 | _x variants should not ever be used again for anything. So when in | |
5862 | doubt, use the ordinary variant. | |
5863 | ||
5864 | */ | |
5865 | ||
0f2d19dd | 5866 | SCM |
68d8be66 | 5867 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5868 | { |
cc95e00a | 5869 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5870 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5871 | else | |
385609b9 | 5872 | return SCM_I_XEVAL (exp, env); |
0f2d19dd JB |
5873 | } |
5874 | ||
68d8be66 MD |
5875 | SCM |
5876 | scm_i_eval (SCM exp, SCM env) | |
5877 | { | |
26fb6390 | 5878 | exp = scm_copy_tree (exp); |
cc95e00a | 5879 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5880 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5881 | else | |
385609b9 | 5882 | return SCM_I_XEVAL (exp, env); |
68d8be66 MD |
5883 | } |
5884 | ||
5885 | SCM | |
4163eb72 | 5886 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5887 | { |
a513ead3 | 5888 | SCM env; |
bcdab802 | 5889 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5890 | if (SCM_NIMP (transformer)) |
fdc28395 | 5891 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5892 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5893 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5894 | } |
5895 | ||
4163eb72 MV |
5896 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5897 | (SCM exp), | |
2069af38 | 5898 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5899 | "the current module.") |
5900 | #define FUNC_NAME s_scm_primitive_eval | |
5901 | { | |
a513ead3 | 5902 | SCM env; |
bcdab802 | 5903 | SCM transformer = scm_current_module_transformer (); |
7888309b | 5904 | if (scm_is_true (transformer)) |
fdc28395 | 5905 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5906 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5907 | return scm_i_eval (exp, env); |
5908 | } | |
5909 | #undef FUNC_NAME | |
5910 | ||
6bff1368 | 5911 | |
68d8be66 MD |
5912 | /* Eval does not take the second arg optionally. This is intentional |
5913 | * in order to be R5RS compatible, and to prepare for the new module | |
5914 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5915 | * environment explicit. */ |
549e6ec6 | 5916 | |
4163eb72 | 5917 | SCM |
9de87eea | 5918 | scm_eval_x (SCM exp, SCM module_or_state) |
4163eb72 | 5919 | { |
9de87eea | 5920 | SCM res; |
4163eb72 | 5921 | |
661ae7ab | 5922 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
9de87eea | 5923 | if (scm_is_dynamic_state (module_or_state)) |
661ae7ab | 5924 | scm_dynwind_current_dynamic_state (module_or_state); |
9de87eea | 5925 | else |
661ae7ab | 5926 | scm_dynwind_current_module (module_or_state); |
4163eb72 | 5927 | |
9de87eea MV |
5928 | res = scm_primitive_eval_x (exp); |
5929 | ||
661ae7ab | 5930 | scm_dynwind_end (); |
9de87eea | 5931 | return res; |
4163eb72 | 5932 | } |
09074dbf | 5933 | |
68d8be66 | 5934 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
9de87eea | 5935 | (SCM exp, SCM module_or_state), |
4163eb72 | 5936 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" |
9de87eea MV |
5937 | "in the top-level environment specified by\n" |
5938 | "@var{module_or_state}.\n" | |
8f85c0c6 | 5939 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
9de87eea MV |
5940 | "@var{module_or_state} is made the current module when\n" |
5941 | "it is a module, or the current dynamic state when it is\n" | |
5942 | "a dynamic state." | |
6be1fab9 | 5943 | "Example: (eval '(+ 1 2) (interaction-environment))") |
1bbd0b84 | 5944 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5945 | { |
9de87eea MV |
5946 | SCM res; |
5947 | ||
661ae7ab | 5948 | scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE); |
9de87eea | 5949 | if (scm_is_dynamic_state (module_or_state)) |
661ae7ab | 5950 | scm_dynwind_current_dynamic_state (module_or_state); |
9de87eea | 5951 | else |
661ae7ab | 5952 | scm_dynwind_current_module (module_or_state); |
9de87eea MV |
5953 | |
5954 | res = scm_primitive_eval (exp); | |
09074dbf | 5955 | |
661ae7ab | 5956 | scm_dynwind_end (); |
9de87eea | 5957 | return res; |
0f2d19dd | 5958 | } |
1bbd0b84 | 5959 | #undef FUNC_NAME |
0f2d19dd | 5960 | |
6dbd0af5 | 5961 | |
434f2f7a | 5962 | /* At this point, deval and scm_dapply are generated. |
6dbd0af5 MD |
5963 | */ |
5964 | ||
a44a9715 DH |
5965 | #define DEVAL |
5966 | #include "eval.c" | |
0f2d19dd | 5967 | |
1cc91f1b | 5968 | |
434f2f7a DH |
5969 | #if (SCM_ENABLE_DEPRECATED == 1) |
5970 | ||
5971 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5972 | SCM scm_ceval (SCM x, SCM env) | |
5973 | { | |
a61f4e0c | 5974 | if (scm_is_pair (x)) |
434f2f7a | 5975 | return ceval (x, env); |
cc95e00a | 5976 | else if (scm_is_symbol (x)) |
434f2f7a DH |
5977 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
5978 | else | |
385609b9 | 5979 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
5980 | } |
5981 | ||
5982 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5983 | SCM scm_deval (SCM x, SCM env) | |
5984 | { | |
a61f4e0c | 5985 | if (scm_is_pair (x)) |
434f2f7a | 5986 | return deval (x, env); |
cc95e00a | 5987 | else if (scm_is_symbol (x)) |
434f2f7a DH |
5988 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
5989 | else | |
385609b9 | 5990 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
5991 | } |
5992 | ||
5993 | static SCM | |
5994 | dispatching_eval (SCM x, SCM env) | |
5995 | { | |
5996 | if (scm_debug_mode_p) | |
5997 | return scm_deval (x, env); | |
5998 | else | |
5999 | return scm_ceval (x, env); | |
6000 | } | |
6001 | ||
6002 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
6003 | SCM (*scm_ceval_ptr) (SCM x, SCM env) = dispatching_eval; | |
6004 | ||
6005 | #endif | |
6006 | ||
6007 | ||
0f2d19dd JB |
6008 | void |
6009 | scm_init_eval () | |
0f2d19dd | 6010 | { |
d1138028 MV |
6011 | scm_i_pthread_mutex_init (&source_mutex, |
6012 | scm_i_pthread_mutexattr_recursive); | |
6013 | ||
33b97402 MD |
6014 | scm_init_opts (scm_evaluator_traps, |
6015 | scm_evaluator_trap_table, | |
6016 | SCM_N_EVALUATOR_TRAPS); | |
6017 | scm_init_opts (scm_eval_options_interface, | |
6018 | scm_eval_opts, | |
6019 | SCM_N_EVAL_OPTIONS); | |
6020 | ||
f99c9c28 | 6021 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
9de87eea | 6022 | scm_set_smob_mark (scm_tc16_promise, promise_mark); |
28d52ebb | 6023 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 6024 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 6025 | |
a44a9715 DH |
6026 | undefineds = scm_list_1 (SCM_UNDEFINED); |
6027 | SCM_SETCDR (undefineds, undefineds); | |
6028 | scm_permanent_object (undefineds); | |
7c33806a | 6029 | |
a44a9715 | 6030 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 6031 | |
a44a9715 DH |
6032 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
6033 | scm_permanent_object (f_apply); | |
86d31dfe | 6034 | |
a0599745 | 6035 | #include "libguile/eval.x" |
60a49842 | 6036 | |
25eaf21a | 6037 | scm_add_feature ("delay"); |
0f2d19dd | 6038 | } |
0f2d19dd | 6039 | |
6dbd0af5 | 6040 | #endif /* !DEVAL */ |
89e00824 ML |
6041 | |
6042 | /* | |
6043 | Local Variables: | |
6044 | c-file-style: "gnu" | |
6045 | End: | |
6046 | */ |