Commit | Line | Data |
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434f2f7a DH |
1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004 |
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 | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
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); |
0f572ba7 DH |
99 | |
100 | \f | |
101 | ||
e6729603 DH |
102 | /* {Syntax Errors} |
103 | * | |
104 | * This section defines the message strings for the syntax errors that can be | |
105 | * detected during memoization and the functions and macros that shall be | |
106 | * called by the memoizer code to signal syntax errors. */ | |
107 | ||
108 | ||
109 | /* Syntax errors that can be detected during memoization: */ | |
110 | ||
111 | /* Circular or improper lists do not form valid scheme expressions. If a | |
112 | * circular list or an improper list is detected in a place where a scheme | |
113 | * expression is expected, a 'Bad expression' error is signalled. */ | |
114 | static const char s_bad_expression[] = "Bad expression"; | |
115 | ||
89bff2fc DH |
116 | /* If a form is detected that holds a different number of expressions than are |
117 | * required in that context, a 'Missing or extra expression' error is | |
118 | * signalled. */ | |
119 | static const char s_expression[] = "Missing or extra expression in"; | |
120 | ||
cc56ba80 | 121 | /* If a form is detected that holds less expressions than are required in that |
8ae95199 | 122 | * context, a 'Missing expression' error is signalled. */ |
cc56ba80 DH |
123 | static const char s_missing_expression[] = "Missing expression in"; |
124 | ||
609a8b86 | 125 | /* If a form is detected that holds more expressions than are allowed in that |
8ae95199 | 126 | * context, an 'Extra expression' error is signalled. */ |
609a8b86 DH |
127 | static const char s_extra_expression[] = "Extra expression in"; |
128 | ||
89bff2fc DH |
129 | /* The empty combination '()' is not allowed as an expression in scheme. If |
130 | * it is detected in a place where an expression is expected, an 'Illegal | |
131 | * empty combination' error is signalled. Note: If you encounter this error | |
132 | * message, it is very likely that you intended to denote the empty list. To | |
133 | * do so, you need to quote the empty list like (quote ()) or '(). */ | |
134 | static const char s_empty_combination[] = "Illegal empty combination"; | |
135 | ||
c86c440b DH |
136 | /* A body may hold an arbitrary number of internal defines, followed by a |
137 | * non-empty sequence of expressions. If a body with an empty sequence of | |
138 | * expressions is detected, a 'Missing body expression' error is signalled. | |
139 | */ | |
140 | static const char s_missing_body_expression[] = "Missing body expression in"; | |
141 | ||
142 | /* A body may hold an arbitrary number of internal defines, followed by a | |
143 | * non-empty sequence of expressions. Each the definitions and the | |
144 | * expressions may be grouped arbitraryly with begin, but it is not allowed to | |
145 | * mix definitions and expressions. If a define form in a body mixes | |
146 | * definitions and expressions, a 'Mixed definitions and expressions' error is | |
6bff1368 | 147 | * signalled. */ |
c86c440b | 148 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; |
6bff1368 DH |
149 | /* Definitions are only allowed on the top level and at the start of a body. |
150 | * If a definition is detected anywhere else, a 'Bad define placement' error | |
151 | * is signalled. */ | |
152 | static const char s_bad_define[] = "Bad define placement"; | |
c86c440b | 153 | |
2a6f7afe DH |
154 | /* Case or cond expressions must have at least one clause. If a case or cond |
155 | * expression without any clauses is detected, a 'Missing clauses' error is | |
156 | * signalled. */ | |
157 | static const char s_missing_clauses[] = "Missing clauses"; | |
158 | ||
609a8b86 DH |
159 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
160 | * last clause. If after the 'else' case clause further clauses are detected, | |
161 | * a 'Misplaced else clause' error is signalled. */ | |
162 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
163 | ||
2a6f7afe DH |
164 | /* If a case clause is detected that is not in the format |
165 | * (<label(s)> <expression1> <expression2> ...) | |
166 | * a 'Bad case clause' error is signalled. */ | |
167 | static const char s_bad_case_clause[] = "Bad case clause"; | |
168 | ||
2a6f7afe DH |
169 | /* If a case clause is detected where the <label(s)> element is neither a |
170 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
171 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
172 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
173 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
174 | * local or global environment, it is not considered a syntactic keyword, but | |
175 | * will be treated as any other variable. */ | |
176 | static const char s_bad_case_labels[] = "Bad case labels"; | |
177 | ||
178 | /* In a case statement all labels have to be distinct. If in a case statement | |
179 | * a label occurs more than once, a 'Duplicate case label' error is | |
180 | * signalled. */ | |
181 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
182 | ||
609a8b86 DH |
183 | /* If a cond clause is detected that is not in one of the formats |
184 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
185 | * a 'Bad cond clause' error is signalled. */ | |
186 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
187 | ||
188 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
189 | * not hold a recipient element for the test result, a 'Missing recipient' | |
190 | * error is signalled. */ | |
191 | static const char s_missing_recipient[] = "Missing recipient in"; | |
192 | ||
cc56ba80 DH |
193 | /* If in a position where a variable name is required some other object is |
194 | * detected, a 'Bad variable' error is signalled. */ | |
195 | static const char s_bad_variable[] = "Bad variable"; | |
196 | ||
a954ce1d DH |
197 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
198 | * possibly empty list. If any other object is detected in a place where a | |
199 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
200 | static const char s_bad_bindings[] = "Bad bindings"; | |
201 | ||
202 | /* Depending on the syntactic context, a binding has to be in the format | |
203 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
204 | * If anything else is detected in a place where a binding was expected, a | |
205 | * 'Bad binding' error is signalled. */ | |
206 | static const char s_bad_binding[] = "Bad binding"; | |
207 | ||
4610b011 DH |
208 | /* Some syntactic forms don't allow variable names to appear more than once in |
209 | * a list of bindings. If such a situation is nevertheless detected, a | |
210 | * 'Duplicate binding' error is signalled. */ | |
211 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
212 | ||
a954ce1d DH |
213 | /* If the exit form of a 'do' expression is not in the format |
214 | * (<test> <expression> ...) | |
215 | * a 'Bad exit clause' error is signalled. */ | |
216 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
217 | ||
03a3e941 DH |
218 | /* The formal function arguments of a lambda expression have to be either a |
219 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
220 | * error is signalled. */ | |
221 | static const char s_bad_formals[] = "Bad formals"; | |
222 | ||
223 | /* If in a lambda expression something else than a symbol is detected at a | |
224 | * place where a formal function argument is required, a 'Bad formal' error is | |
225 | * signalled. */ | |
226 | static const char s_bad_formal[] = "Bad formal"; | |
227 | ||
228 | /* If in the arguments list of a lambda expression an argument name occurs | |
229 | * more than once, a 'Duplicate formal' error is signalled. */ | |
230 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
231 | ||
6f81708a DH |
232 | /* If the evaluation of an unquote-splicing expression gives something else |
233 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
234 | * signalled. */ | |
235 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
236 | ||
9a848baf DH |
237 | /* If something else than an exact integer is detected as the argument for |
238 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
239 | static const char s_bad_slot_number[] = "Bad slot number"; | |
240 | ||
e6729603 DH |
241 | |
242 | /* Signal a syntax error. We distinguish between the form that caused the | |
243 | * error and the enclosing expression. The error message will print out as | |
244 | * shown in the following pattern. The file name and line number are only | |
245 | * given when they can be determined from the erroneous form or from the | |
246 | * enclosing expression. | |
247 | * | |
248 | * <filename>: In procedure memoization: | |
249 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
250 | ||
251 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
252 | ||
253 | /* The prototype is needed to indicate that the function does not return. */ | |
254 | static void | |
255 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
256 | ||
257 | static void | |
258 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
259 | { | |
cc95e00a | 260 | SCM msg_string = scm_from_locale_string (msg); |
e6729603 DH |
261 | SCM filename = SCM_BOOL_F; |
262 | SCM linenr = SCM_BOOL_F; | |
263 | const char *format; | |
264 | SCM args; | |
265 | ||
a61f4e0c | 266 | if (scm_is_pair (form)) |
e6729603 DH |
267 | { |
268 | filename = scm_source_property (form, scm_sym_filename); | |
269 | linenr = scm_source_property (form, scm_sym_line); | |
270 | } | |
271 | ||
a61f4e0c | 272 | if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr)) |
e6729603 DH |
273 | { |
274 | filename = scm_source_property (expr, scm_sym_filename); | |
275 | linenr = scm_source_property (expr, scm_sym_line); | |
276 | } | |
277 | ||
278 | if (!SCM_UNBNDP (expr)) | |
279 | { | |
7888309b | 280 | if (scm_is_true (filename)) |
e6729603 DH |
281 | { |
282 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
283 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
284 | } | |
7888309b | 285 | else if (scm_is_true (linenr)) |
e6729603 DH |
286 | { |
287 | format = "In line ~S: ~A ~S in expression ~S."; | |
288 | args = scm_list_4 (linenr, msg_string, form, expr); | |
289 | } | |
290 | else | |
291 | { | |
292 | format = "~A ~S in expression ~S."; | |
293 | args = scm_list_3 (msg_string, form, expr); | |
294 | } | |
295 | } | |
296 | else | |
297 | { | |
7888309b | 298 | if (scm_is_true (filename)) |
e6729603 DH |
299 | { |
300 | format = "In file ~S, line ~S: ~A ~S."; | |
301 | args = scm_list_4 (filename, linenr, msg_string, form); | |
302 | } | |
7888309b | 303 | else if (scm_is_true (linenr)) |
e6729603 DH |
304 | { |
305 | format = "In line ~S: ~A ~S."; | |
306 | args = scm_list_3 (linenr, msg_string, form); | |
307 | } | |
308 | else | |
309 | { | |
310 | format = "~A ~S."; | |
311 | args = scm_list_2 (msg_string, form); | |
312 | } | |
313 | } | |
314 | ||
315 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
316 | } | |
317 | ||
318 | ||
319 | /* Shortcut macros to simplify syntax error handling. */ | |
320 | #define ASSERT_SYNTAX(cond, message, form) \ | |
321 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
322 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
323 | { if (!(cond)) syntax_error (message, form, expr); } | |
324 | ||
325 | \f | |
326 | ||
d0624e39 DH |
327 | /* {Ilocs} |
328 | * | |
329 | * Ilocs are memoized references to variables in local environment frames. | |
330 | * They are represented as three values: The relative offset of the | |
331 | * environment frame, the number of the binding within that frame, and a | |
332 | * boolean value indicating whether the binding is the last binding in the | |
333 | * frame. | |
a55c2b68 MV |
334 | * |
335 | * Frame numbers have 11 bits, relative offsets have 12 bits. | |
d0624e39 | 336 | */ |
7e6e6b37 | 337 | |
d0624e39 | 338 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) |
7e6e6b37 DH |
339 | #define SCM_IFRINC (0x00000100L) |
340 | #define SCM_ICDR (0x00080000L) | |
d0624e39 | 341 | #define SCM_IDINC (0x00100000L) |
7e6e6b37 DH |
342 | #define SCM_IFRAME(n) ((long)((SCM_ICDR-SCM_IFRINC)>>8) \ |
343 | & (SCM_UNPACK (n) >> 8)) | |
344 | #define SCM_IDIST(n) (SCM_UNPACK (n) >> 20) | |
345 | #define SCM_ICDRP(n) (SCM_ICDR & SCM_UNPACK (n)) | |
d0624e39 | 346 | #define SCM_IDSTMSK (-SCM_IDINC) |
a55c2b68 MV |
347 | #define SCM_IFRAMEMAX ((1<<11)-1) |
348 | #define SCM_IDISTMAX ((1<<12)-1) | |
d0624e39 DH |
349 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ |
350 | SCM_PACK ( \ | |
351 | ((frame_nr) << 8) \ | |
352 | + ((binding_nr) << 20) \ | |
353 | + ((last_p) ? SCM_ICDR : 0) \ | |
354 | + scm_tc8_iloc ) | |
355 | ||
7e6e6b37 DH |
356 | void |
357 | scm_i_print_iloc (SCM iloc, SCM port) | |
358 | { | |
359 | scm_puts ("#@", port); | |
360 | scm_intprint ((long) SCM_IFRAME (iloc), 10, port); | |
361 | scm_putc (SCM_ICDRP (iloc) ? '-' : '+', port); | |
362 | scm_intprint ((long) SCM_IDIST (iloc), 10, port); | |
363 | } | |
364 | ||
d0624e39 DH |
365 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) |
366 | ||
367 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
90df793f | 368 | |
d0624e39 DH |
369 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, |
370 | (SCM frame, SCM binding, SCM cdrp), | |
371 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
372 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
373 | #define FUNC_NAME s_scm_dbg_make_iloc | |
374 | { | |
a55c2b68 MV |
375 | return SCM_MAKE_ILOC (scm_to_unsigned_integer (frame, 0, SCM_IFRAME_MAX), |
376 | scm_to_unsigned_integer (binding, 0, SCM_IDIST_MAX), | |
7888309b | 377 | scm_is_true (cdrp)); |
d0624e39 DH |
378 | } |
379 | #undef FUNC_NAME | |
380 | ||
381 | SCM scm_dbg_iloc_p (SCM obj); | |
90df793f | 382 | |
d0624e39 DH |
383 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, |
384 | (SCM obj), | |
385 | "Return @code{#t} if @var{obj} is an iloc.") | |
386 | #define FUNC_NAME s_scm_dbg_iloc_p | |
387 | { | |
7888309b | 388 | return scm_from_bool (SCM_ILOCP (obj)); |
d0624e39 DH |
389 | } |
390 | #undef FUNC_NAME | |
391 | ||
392 | #endif | |
393 | ||
394 | \f | |
395 | ||
7e6e6b37 DH |
396 | /* {Evaluator byte codes (isyms)} |
397 | */ | |
398 | ||
399 | #define ISYMNUM(n) (SCM_ITAG8_DATA (n)) | |
400 | ||
401 | /* This table must agree with the list of SCM_IM_ constants in tags.h */ | |
402 | static const char *const isymnames[] = | |
403 | { | |
404 | "#@and", | |
405 | "#@begin", | |
406 | "#@case", | |
407 | "#@cond", | |
408 | "#@do", | |
409 | "#@if", | |
410 | "#@lambda", | |
411 | "#@let", | |
412 | "#@let*", | |
413 | "#@letrec", | |
414 | "#@or", | |
415 | "#@quote", | |
416 | "#@set!", | |
417 | "#@define", | |
418 | "#@apply", | |
419 | "#@call-with-current-continuation", | |
420 | "#@dispatch", | |
421 | "#@slot-ref", | |
422 | "#@slot-set!", | |
423 | "#@delay", | |
424 | "#@future", | |
425 | "#@call-with-values", | |
426 | "#@else", | |
427 | "#@arrow", | |
428 | "#@nil-cond", | |
429 | "#@bind" | |
430 | }; | |
431 | ||
432 | void | |
433 | scm_i_print_isym (SCM isym, SCM port) | |
434 | { | |
435 | const size_t isymnum = ISYMNUM (isym); | |
436 | if (isymnum < (sizeof isymnames / sizeof (char *))) | |
437 | scm_puts (isymnames[isymnum], port); | |
438 | else | |
439 | scm_ipruk ("isym", isym, port); | |
440 | } | |
441 | ||
442 | \f | |
443 | ||
e5156567 DH |
444 | /* The function lookup_symbol is used during memoization: Lookup the symbol in |
445 | * the environment. If there is no binding for the symbol, SCM_UNDEFINED is | |
57d23e25 DH |
446 | * returned. If the symbol is a global variable, the variable object to which |
447 | * the symbol is bound is returned. Finally, if the symbol is a local | |
448 | * variable the corresponding iloc object is returned. */ | |
6f81708a DH |
449 | |
450 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
451 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
57d23e25 DH |
452 | * is unbound and it returns a variable object if the symbol is a global |
453 | * variable. */ | |
6f81708a DH |
454 | static SCM |
455 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
456 | { | |
457 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
7888309b | 458 | if (scm_is_false (variable)) |
57d23e25 | 459 | return SCM_UNDEFINED; |
6f81708a | 460 | else |
57d23e25 | 461 | return variable; |
6f81708a DH |
462 | } |
463 | ||
464 | static SCM | |
465 | lookup_symbol (const SCM symbol, const SCM env) | |
466 | { | |
467 | SCM frame_idx; | |
468 | unsigned int frame_nr; | |
469 | ||
470 | for (frame_idx = env, frame_nr = 0; | |
a61f4e0c | 471 | !scm_is_null (frame_idx); |
6f81708a DH |
472 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) |
473 | { | |
474 | const SCM frame = SCM_CAR (frame_idx); | |
a61f4e0c | 475 | if (scm_is_pair (frame)) |
6f81708a DH |
476 | { |
477 | /* frame holds a local environment frame */ | |
478 | SCM symbol_idx; | |
479 | unsigned int symbol_nr; | |
480 | ||
481 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
a61f4e0c | 482 | scm_is_pair (symbol_idx); |
6f81708a DH |
483 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) |
484 | { | |
bc36d050 | 485 | if (scm_is_eq (SCM_CAR (symbol_idx), symbol)) |
6f81708a DH |
486 | /* found the symbol, therefore return the iloc */ |
487 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
488 | } | |
bc36d050 | 489 | if (scm_is_eq (symbol_idx, symbol)) |
6f81708a DH |
490 | /* found the symbol as the last element of the current frame */ |
491 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
492 | } | |
493 | else | |
494 | { | |
495 | /* no more local environment frames */ | |
496 | return lookup_global_symbol (symbol, frame); | |
497 | } | |
498 | } | |
499 | ||
500 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
501 | } | |
502 | ||
503 | ||
504 | /* Return true if the symbol is - from the point of view of a macro | |
505 | * transformer - a literal in the sense specified in chapter "pattern | |
506 | * language" of R5RS. In the code below, however, we don't match the | |
507 | * definition of R5RS exactly: It returns true if the identifier has no | |
508 | * binding or if it is a syntactic keyword. */ | |
509 | static int | |
510 | literal_p (const SCM symbol, const SCM env) | |
511 | { | |
57d23e25 DH |
512 | const SCM variable = lookup_symbol (symbol, env); |
513 | if (SCM_UNBNDP (variable)) | |
514 | return 1; | |
515 | if (SCM_VARIABLEP (variable) && SCM_MACROP (SCM_VARIABLE_REF (variable))) | |
6f81708a DH |
516 | return 1; |
517 | else | |
518 | return 0; | |
519 | } | |
17fa3fcf | 520 | |
5fb64383 DH |
521 | |
522 | /* Return true if the expression is self-quoting in the memoized code. Thus, | |
523 | * some other objects (like e. g. vectors) are reported as self-quoting, which | |
524 | * according to R5RS would need to be quoted. */ | |
525 | static int | |
526 | is_self_quoting_p (const SCM expr) | |
527 | { | |
a61f4e0c | 528 | if (scm_is_pair (expr)) |
5fb64383 | 529 | return 0; |
cc95e00a | 530 | else if (scm_is_symbol (expr)) |
5fb64383 | 531 | return 0; |
a61f4e0c | 532 | else if (scm_is_null (expr)) |
5fb64383 DH |
533 | return 0; |
534 | else return 1; | |
535 | } | |
536 | ||
0f2d19dd | 537 | |
212e58ed DH |
538 | SCM_SYMBOL (sym_three_question_marks, "???"); |
539 | ||
540 | static SCM | |
541 | unmemoize_expression (const SCM expr, const SCM env) | |
542 | { | |
543 | if (SCM_ILOCP (expr)) | |
544 | { | |
545 | SCM frame_idx; | |
546 | unsigned long int frame_nr; | |
547 | SCM symbol_idx; | |
548 | unsigned long int symbol_nr; | |
549 | ||
550 | for (frame_idx = env, frame_nr = SCM_IFRAME (expr); | |
551 | frame_nr != 0; | |
552 | frame_idx = SCM_CDR (frame_idx), --frame_nr) | |
553 | ; | |
554 | for (symbol_idx = SCM_CAAR (frame_idx), symbol_nr = SCM_IDIST (expr); | |
555 | symbol_nr != 0; | |
556 | symbol_idx = SCM_CDR (symbol_idx), --symbol_nr) | |
557 | ; | |
558 | return SCM_ICDRP (expr) ? symbol_idx : SCM_CAR (symbol_idx); | |
559 | } | |
560 | else if (SCM_VARIABLEP (expr)) | |
561 | { | |
562 | const SCM sym = scm_module_reverse_lookup (scm_env_module (env), expr); | |
7888309b | 563 | return scm_is_true (sym) ? sym : sym_three_question_marks; |
212e58ed | 564 | } |
4057a3e0 | 565 | else if (scm_is_simple_vector (expr)) |
212e58ed DH |
566 | { |
567 | return scm_list_2 (scm_sym_quote, expr); | |
568 | } | |
a61f4e0c | 569 | else if (!scm_is_pair (expr)) |
212e58ed DH |
570 | { |
571 | return expr; | |
572 | } | |
573 | else if (SCM_ISYMP (SCM_CAR (expr))) | |
574 | { | |
575 | return unmemoize_builtin_macro (expr, env); | |
576 | } | |
577 | else | |
578 | { | |
579 | return unmemoize_exprs (expr, env); | |
580 | } | |
581 | } | |
582 | ||
583 | ||
584 | static SCM | |
585 | unmemoize_exprs (const SCM exprs, const SCM env) | |
586 | { | |
90df793f | 587 | SCM r_result = SCM_EOL; |
9fcf3cbb | 588 | SCM expr_idx = exprs; |
90df793f DH |
589 | SCM um_expr; |
590 | ||
591 | /* Note that due to the current lazy memoizer we may find partially memoized | |
5fa0939c | 592 | * code during execution. In such code we have to expect improper lists of |
90df793f DH |
593 | * expressions: On the one hand, for such code syntax checks have not yet |
594 | * fully been performed, on the other hand, there may be even legal code | |
595 | * like '(a . b) appear as an improper list of expressions as long as the | |
596 | * quote expression is still in its unmemoized form. For this reason, the | |
597 | * following code handles improper lists of expressions until memoization | |
598 | * and execution have been completely separated. */ | |
a61f4e0c | 599 | for (; scm_is_pair (expr_idx); expr_idx = SCM_CDR (expr_idx)) |
212e58ed DH |
600 | { |
601 | const SCM expr = SCM_CAR (expr_idx); | |
5fa0939c DH |
602 | |
603 | /* In partially memoized code, lists of expressions that stem from a | |
604 | * body form may start with an ISYM if the body itself has not yet been | |
605 | * memoized. This isym is just an internal marker to indicate that the | |
606 | * body still needs to be memoized. An isym may occur at the very | |
607 | * beginning of the body or after one or more comment strings. It is | |
608 | * dropped during unmemoization. */ | |
609 | if (!SCM_ISYMP (expr)) | |
610 | { | |
611 | um_expr = unmemoize_expression (expr, env); | |
612 | r_result = scm_cons (um_expr, r_result); | |
613 | } | |
90df793f DH |
614 | } |
615 | um_expr = unmemoize_expression (expr_idx, env); | |
a61f4e0c | 616 | if (!scm_is_null (r_result)) |
90df793f DH |
617 | { |
618 | const SCM result = scm_reverse_x (r_result, SCM_UNDEFINED); | |
619 | SCM_SETCDR (r_result, um_expr); | |
620 | return result; | |
621 | } | |
622 | else | |
623 | { | |
624 | return um_expr; | |
212e58ed | 625 | } |
212e58ed DH |
626 | } |
627 | ||
628 | ||
34adf7ea DH |
629 | /* Rewrite the body (which is given as the list of expressions forming the |
630 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
631 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
632 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
633 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 634 | * SCM_IM_LET, etc. |
34adf7ea DH |
635 | * |
636 | * It is assumed that the calling expression has already made sure that the | |
637 | * body is a proper list. */ | |
26d5b9b4 | 638 | static SCM |
430b8401 | 639 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 640 | { |
26d5b9b4 | 641 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
642 | if (SCM_ISYMP (SCM_CAR (exprs))) |
643 | return exprs; | |
644 | else | |
645 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
646 | } |
647 | ||
1cc91f1b | 648 | |
57d23e25 DH |
649 | /* The function m_expand_body memoizes a proper list of expressions forming a |
650 | * body. This function takes care of dealing with internal defines and | |
651 | * transforming them into an equivalent letrec expression. The list of | |
652 | * expressions is rewritten in place. */ | |
910b5125 | 653 | |
57d23e25 DH |
654 | /* This is a helper function for m_expand_body. If the argument expression is |
655 | * a symbol that denotes a syntactic keyword, the corresponding macro object | |
656 | * is returned, in all other cases the function returns SCM_UNDEFINED. */ | |
910b5125 DH |
657 | static SCM |
658 | try_macro_lookup (const SCM expr, const SCM env) | |
659 | { | |
cc95e00a | 660 | if (scm_is_symbol (expr)) |
910b5125 | 661 | { |
57d23e25 DH |
662 | const SCM variable = lookup_symbol (expr, env); |
663 | if (SCM_VARIABLEP (variable)) | |
664 | { | |
665 | const SCM value = SCM_VARIABLE_REF (variable); | |
666 | if (SCM_MACROP (value)) | |
667 | return value; | |
668 | } | |
910b5125 | 669 | } |
57d23e25 DH |
670 | |
671 | return SCM_UNDEFINED; | |
910b5125 DH |
672 | } |
673 | ||
674 | /* This is a helper function for m_expand_body. It expands user macros, | |
675 | * because for the correct translation of a body we need to know whether they | |
676 | * expand to a definition. */ | |
677 | static SCM | |
678 | expand_user_macros (SCM expr, const SCM env) | |
679 | { | |
a61f4e0c | 680 | while (scm_is_pair (expr)) |
910b5125 DH |
681 | { |
682 | const SCM car_expr = SCM_CAR (expr); | |
683 | const SCM new_car = expand_user_macros (car_expr, env); | |
684 | const SCM value = try_macro_lookup (new_car, env); | |
685 | ||
686 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
687 | { | |
688 | /* User macros transform code into code. */ | |
689 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
690 | /* We need to reiterate on the transformed code. */ | |
691 | } | |
692 | else | |
693 | { | |
694 | /* No user macro: return. */ | |
695 | SCM_SETCAR (expr, new_car); | |
696 | return expr; | |
697 | } | |
698 | } | |
699 | ||
700 | return expr; | |
701 | } | |
702 | ||
703 | /* This is a helper function for m_expand_body. It determines if a given form | |
704 | * represents an application of a given built-in macro. The built-in macro to | |
705 | * check for is identified by its syntactic keyword. The form is an | |
706 | * application of the given macro if looking up the car of the form in the | |
707 | * given environment actually returns the built-in macro. */ | |
708 | static int | |
709 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
710 | { | |
a61f4e0c | 711 | if (scm_is_pair (form)) |
910b5125 DH |
712 | { |
713 | const SCM car_form = SCM_CAR (form); | |
714 | const SCM value = try_macro_lookup (car_form, env); | |
715 | if (SCM_BUILTIN_MACRO_P (value)) | |
716 | { | |
717 | const SCM macro_name = scm_macro_name (value); | |
bc36d050 | 718 | return scm_is_eq (macro_name, syntactic_keyword); |
910b5125 DH |
719 | } |
720 | } | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
9d4bf6d3 | 725 | static void |
910b5125 DH |
726 | m_expand_body (const SCM forms, const SCM env) |
727 | { | |
728 | /* The first body form can be skipped since it is known to be the ISYM that | |
729 | * was prepended to the body by m_body. */ | |
730 | SCM cdr_forms = SCM_CDR (forms); | |
731 | SCM form_idx = cdr_forms; | |
732 | SCM definitions = SCM_EOL; | |
733 | SCM sequence = SCM_EOL; | |
734 | ||
735 | /* According to R5RS, the list of body forms consists of two parts: a number | |
736 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
737 | * expressions. Each the definitions and the expressions may be grouped | |
738 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
739 | * expressions. The task of the following loop therefore is to split the | |
740 | * list of body forms into the list of definitions and the sequence of | |
741 | * expressions. */ | |
a61f4e0c | 742 | while (!scm_is_null (form_idx)) |
910b5125 DH |
743 | { |
744 | const SCM form = SCM_CAR (form_idx); | |
745 | const SCM new_form = expand_user_macros (form, env); | |
746 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
747 | { | |
748 | definitions = scm_cons (new_form, definitions); | |
749 | form_idx = SCM_CDR (form_idx); | |
750 | } | |
751 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
752 | { | |
753 | /* We have encountered a group of forms. This has to be either a | |
754 | * (possibly empty) group of (possibly further grouped) definitions, | |
755 | * or a non-empty group of (possibly further grouped) | |
756 | * expressions. */ | |
757 | const SCM grouped_forms = SCM_CDR (new_form); | |
758 | unsigned int found_definition = 0; | |
759 | unsigned int found_expression = 0; | |
760 | SCM grouped_form_idx = grouped_forms; | |
a61f4e0c | 761 | while (!found_expression && !scm_is_null (grouped_form_idx)) |
910b5125 DH |
762 | { |
763 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
764 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
765 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
766 | { | |
767 | found_definition = 1; | |
768 | definitions = scm_cons (new_inner_form, definitions); | |
769 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
770 | } | |
771 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
772 | { | |
773 | const SCM inner_group = SCM_CDR (new_inner_form); | |
774 | grouped_form_idx | |
775 | = scm_append (scm_list_2 (inner_group, | |
776 | SCM_CDR (grouped_form_idx))); | |
777 | } | |
778 | else | |
779 | { | |
780 | /* The group marks the start of the expressions of the body. | |
781 | * We have to make sure that within the same group we have | |
782 | * not encountered a definition before. */ | |
783 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
784 | found_expression = 1; | |
785 | grouped_form_idx = SCM_EOL; | |
786 | } | |
787 | } | |
788 | ||
789 | /* We have finished processing the group. If we have not yet | |
790 | * encountered an expression we continue processing the forms of the | |
791 | * body to collect further definition forms. Otherwise, the group | |
792 | * marks the start of the sequence of expressions of the body. */ | |
793 | if (!found_expression) | |
794 | { | |
795 | form_idx = SCM_CDR (form_idx); | |
796 | } | |
797 | else | |
798 | { | |
799 | sequence = form_idx; | |
800 | form_idx = SCM_EOL; | |
801 | } | |
802 | } | |
803 | else | |
804 | { | |
805 | /* We have detected a form which is no definition. This marks the | |
806 | * start of the sequence of expressions of the body. */ | |
807 | sequence = form_idx; | |
808 | form_idx = SCM_EOL; | |
809 | } | |
810 | } | |
811 | ||
812 | /* FIXME: forms does not hold information about the file location. */ | |
a61f4e0c | 813 | ASSERT_SYNTAX (scm_is_pair (sequence), s_missing_body_expression, cdr_forms); |
910b5125 | 814 | |
a61f4e0c | 815 | if (!scm_is_null (definitions)) |
910b5125 DH |
816 | { |
817 | SCM definition_idx; | |
818 | SCM letrec_tail; | |
819 | SCM letrec_expression; | |
820 | SCM new_letrec_expression; | |
910b5125 DH |
821 | |
822 | SCM bindings = SCM_EOL; | |
823 | for (definition_idx = definitions; | |
a61f4e0c | 824 | !scm_is_null (definition_idx); |
910b5125 DH |
825 | definition_idx = SCM_CDR (definition_idx)) |
826 | { | |
827 | const SCM definition = SCM_CAR (definition_idx); | |
828 | const SCM canonical_definition = canonicalize_define (definition); | |
829 | const SCM binding = SCM_CDR (canonical_definition); | |
830 | bindings = scm_cons (binding, bindings); | |
831 | }; | |
832 | ||
833 | letrec_tail = scm_cons (bindings, sequence); | |
834 | /* FIXME: forms does not hold information about the file location. */ | |
835 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
836 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
837 | SCM_SETCAR (forms, new_letrec_expression); |
838 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
839 | } |
840 | else | |
841 | { | |
842 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
843 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
844 | } |
845 | } | |
846 | ||
2b189e65 MV |
847 | static SCM |
848 | macroexp (SCM x, SCM env) | |
849 | { | |
850 | SCM res, proc, orig_sym; | |
851 | ||
852 | /* Don't bother to produce error messages here. We get them when we | |
853 | eventually execute the code for real. */ | |
854 | ||
855 | macro_tail: | |
856 | orig_sym = SCM_CAR (x); | |
cc95e00a | 857 | if (!scm_is_symbol (orig_sym)) |
2b189e65 MV |
858 | return x; |
859 | ||
860 | { | |
861 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
862 | if (proc_ptr == NULL) | |
863 | { | |
864 | /* We have lost the race. */ | |
865 | goto macro_tail; | |
866 | } | |
867 | proc = *proc_ptr; | |
868 | } | |
869 | ||
870 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
871 | special forms and should not be evaluated here. */ | |
872 | ||
873 | if (!SCM_MACROP (proc) | |
874 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
875 | return x; | |
876 | ||
877 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ | |
878 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); | |
879 | ||
880 | if (scm_ilength (res) <= 0) | |
881 | res = scm_list_2 (SCM_IM_BEGIN, res); | |
882 | ||
9de87eea | 883 | SCM_CRITICAL_SECTION_START; |
2b189e65 MV |
884 | SCM_SETCAR (x, SCM_CAR (res)); |
885 | SCM_SETCDR (x, SCM_CDR (res)); | |
9de87eea | 886 | SCM_CRITICAL_SECTION_END; |
2b189e65 MV |
887 | |
888 | goto macro_tail; | |
889 | } | |
910b5125 | 890 | |
9fbee57e | 891 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
892 | |
893 | ||
3b88ed2a | 894 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 895 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 896 | |
8ea46249 | 897 | SCM |
e6729603 | 898 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 899 | { |
e6729603 DH |
900 | const SCM cdr_expr = SCM_CDR (expr); |
901 | const long length = scm_ilength (cdr_expr); | |
902 | ||
903 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
904 | ||
905 | if (length == 0) | |
906 | { | |
907 | /* Special case: (and) is replaced by #t. */ | |
908 | return SCM_BOOL_T; | |
909 | } | |
0f2d19dd | 910 | else |
e6729603 DH |
911 | { |
912 | SCM_SETCAR (expr, SCM_IM_AND); | |
913 | return expr; | |
914 | } | |
0f2d19dd JB |
915 | } |
916 | ||
212e58ed DH |
917 | static SCM |
918 | unmemoize_and (const SCM expr, const SCM env) | |
919 | { | |
920 | return scm_cons (scm_sym_and, unmemoize_exprs (SCM_CDR (expr), env)); | |
921 | } | |
922 | ||
1cc91f1b | 923 | |
3b88ed2a | 924 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 925 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
926 | |
927 | SCM | |
2a6f7afe | 928 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 929 | { |
2a6f7afe | 930 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
931 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
932 | * That means, there should be a distinction between uses of begin where an | |
933 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
934 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
935 | ||
936 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
937 | return expr; | |
0f2d19dd JB |
938 | } |
939 | ||
212e58ed DH |
940 | static SCM |
941 | unmemoize_begin (const SCM expr, const SCM env) | |
942 | { | |
943 | return scm_cons (scm_sym_begin, unmemoize_exprs (SCM_CDR (expr), env)); | |
944 | } | |
945 | ||
0f2d19dd | 946 | |
3b88ed2a | 947 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 948 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 949 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 950 | |
8ea46249 | 951 | SCM |
2a6f7afe | 952 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 953 | { |
8ea46249 | 954 | SCM clauses; |
2a6f7afe DH |
955 | SCM all_labels = SCM_EOL; |
956 | ||
957 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
958 | const int else_literal_p = literal_p (scm_sym_else, env); | |
959 | ||
960 | const SCM cdr_expr = SCM_CDR (expr); | |
961 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
962 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
963 | ||
964 | clauses = SCM_CDR (cdr_expr); | |
a61f4e0c | 965 | while (!scm_is_null (clauses)) |
0f2d19dd | 966 | { |
2a6f7afe DH |
967 | SCM labels; |
968 | ||
969 | const SCM clause = SCM_CAR (clauses); | |
970 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
971 | s_bad_case_clause, clause, expr); | |
972 | ||
973 | labels = SCM_CAR (clause); | |
a61f4e0c | 974 | if (scm_is_pair (labels)) |
2a6f7afe DH |
975 | { |
976 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
977 | s_bad_case_labels, labels, expr); | |
26ecfa39 | 978 | all_labels = scm_append (scm_list_2 (labels, all_labels)); |
2a6f7afe | 979 | } |
a61f4e0c | 980 | else if (scm_is_null (labels)) |
58a2510b DH |
981 | { |
982 | /* The list of labels is empty. According to R5RS this is allowed. | |
983 | * It means that the sequence of expressions will never be executed. | |
984 | * Therefore, as an optimization, we could remove the whole | |
985 | * clause. */ | |
986 | } | |
2a6f7afe DH |
987 | else |
988 | { | |
bc36d050 | 989 | ASSERT_SYNTAX_2 (scm_is_eq (labels, scm_sym_else) && else_literal_p, |
2a6f7afe | 990 | s_bad_case_labels, labels, expr); |
a61f4e0c | 991 | ASSERT_SYNTAX_2 (scm_is_null (SCM_CDR (clauses)), |
609a8b86 | 992 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
993 | } |
994 | ||
995 | /* build the new clause */ | |
bc36d050 | 996 | if (scm_is_eq (labels, scm_sym_else)) |
2a6f7afe DH |
997 | SCM_SETCAR (clause, SCM_IM_ELSE); |
998 | ||
8ea46249 | 999 | clauses = SCM_CDR (clauses); |
0f2d19dd | 1000 | } |
2a6f7afe DH |
1001 | |
1002 | /* Check whether all case labels are distinct. */ | |
a61f4e0c | 1003 | for (; !scm_is_null (all_labels); all_labels = SCM_CDR (all_labels)) |
2a6f7afe DH |
1004 | { |
1005 | const SCM label = SCM_CAR (all_labels); | |
7888309b | 1006 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (label, SCM_CDR (all_labels))), |
4610b011 | 1007 | s_duplicate_case_label, label, expr); |
2a6f7afe DH |
1008 | } |
1009 | ||
1010 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1011 | return expr; | |
0f2d19dd JB |
1012 | } |
1013 | ||
212e58ed DH |
1014 | static SCM |
1015 | unmemoize_case (const SCM expr, const SCM env) | |
1016 | { | |
1017 | const SCM um_key_expr = unmemoize_expression (SCM_CADR (expr), env); | |
1018 | SCM um_clauses = SCM_EOL; | |
1019 | SCM clause_idx; | |
1020 | ||
1021 | for (clause_idx = SCM_CDDR (expr); | |
a61f4e0c | 1022 | !scm_is_null (clause_idx); |
212e58ed DH |
1023 | clause_idx = SCM_CDR (clause_idx)) |
1024 | { | |
1025 | const SCM clause = SCM_CAR (clause_idx); | |
1026 | const SCM labels = SCM_CAR (clause); | |
1027 | const SCM exprs = SCM_CDR (clause); | |
1028 | ||
1029 | const SCM um_exprs = unmemoize_exprs (exprs, env); | |
bc36d050 | 1030 | const SCM um_labels = (scm_is_eq (labels, SCM_IM_ELSE)) |
212e58ed DH |
1031 | ? scm_sym_else |
1032 | : scm_i_finite_list_copy (labels); | |
1033 | const SCM um_clause = scm_cons (um_labels, um_exprs); | |
1034 | ||
1035 | um_clauses = scm_cons (um_clause, um_clauses); | |
1036 | } | |
1037 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1038 | ||
1039 | return scm_cons2 (scm_sym_case, um_key_expr, um_clauses); | |
1040 | } | |
1041 | ||
0f2d19dd | 1042 | |
3b88ed2a | 1043 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1044 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1045 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1046 | |
8ea46249 | 1047 | SCM |
609a8b86 | 1048 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1049 | { |
609a8b86 DH |
1050 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1051 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1052 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1053 | ||
1054 | const SCM clauses = SCM_CDR (expr); | |
1055 | SCM clause_idx; | |
1056 | ||
1057 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1058 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1059 | ||
1060 | for (clause_idx = clauses; | |
a61f4e0c | 1061 | !scm_is_null (clause_idx); |
609a8b86 | 1062 | clause_idx = SCM_CDR (clause_idx)) |
0f2d19dd | 1063 | { |
609a8b86 DH |
1064 | SCM test; |
1065 | ||
1066 | const SCM clause = SCM_CAR (clause_idx); | |
1067 | const long length = scm_ilength (clause); | |
1068 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1069 | ||
1070 | test = SCM_CAR (clause); | |
bc36d050 | 1071 | if (scm_is_eq (test, scm_sym_else) && else_literal_p) |
0f2d19dd | 1072 | { |
a61f4e0c | 1073 | const int last_clause_p = scm_is_null (SCM_CDR (clause_idx)); |
609a8b86 DH |
1074 | ASSERT_SYNTAX_2 (length >= 2, |
1075 | s_bad_cond_clause, clause, expr); | |
1076 | ASSERT_SYNTAX_2 (last_clause_p, | |
1077 | s_misplaced_else_clause, clause, expr); | |
1078 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1079 | } |
609a8b86 | 1080 | else if (length >= 2 |
bc36d050 | 1081 | && scm_is_eq (SCM_CADR (clause), scm_sym_arrow) |
609a8b86 DH |
1082 | && arrow_literal_p) |
1083 | { | |
1084 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1085 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1086 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1087 | } |
0f2d19dd | 1088 | } |
609a8b86 DH |
1089 | |
1090 | SCM_SETCAR (expr, SCM_IM_COND); | |
1091 | return expr; | |
0f2d19dd JB |
1092 | } |
1093 | ||
212e58ed DH |
1094 | static SCM |
1095 | unmemoize_cond (const SCM expr, const SCM env) | |
1096 | { | |
1097 | SCM um_clauses = SCM_EOL; | |
1098 | SCM clause_idx; | |
1099 | ||
1100 | for (clause_idx = SCM_CDR (expr); | |
a61f4e0c | 1101 | !scm_is_null (clause_idx); |
212e58ed DH |
1102 | clause_idx = SCM_CDR (clause_idx)) |
1103 | { | |
1104 | const SCM clause = SCM_CAR (clause_idx); | |
1105 | const SCM sequence = SCM_CDR (clause); | |
1106 | const SCM test = SCM_CAR (clause); | |
1107 | SCM um_test; | |
1108 | SCM um_sequence; | |
1109 | SCM um_clause; | |
1110 | ||
bc36d050 | 1111 | if (scm_is_eq (test, SCM_IM_ELSE)) |
212e58ed DH |
1112 | um_test = scm_sym_else; |
1113 | else | |
1114 | um_test = unmemoize_expression (test, env); | |
1115 | ||
a61f4e0c | 1116 | if (!scm_is_null (sequence) && scm_is_eq (SCM_CAR (sequence), |
bc36d050 | 1117 | SCM_IM_ARROW)) |
212e58ed DH |
1118 | { |
1119 | const SCM target = SCM_CADR (sequence); | |
1120 | const SCM um_target = unmemoize_expression (target, env); | |
1121 | um_sequence = scm_list_2 (scm_sym_arrow, um_target); | |
1122 | } | |
1123 | else | |
1124 | { | |
1125 | um_sequence = unmemoize_exprs (sequence, env); | |
1126 | } | |
1127 | ||
1128 | um_clause = scm_cons (um_test, um_sequence); | |
1129 | um_clauses = scm_cons (um_clause, um_clauses); | |
1130 | } | |
1131 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1132 | ||
1133 | return scm_cons (scm_sym_cond, um_clauses); | |
1134 | } | |
1135 | ||
1cc91f1b | 1136 | |
0f572ba7 DH |
1137 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1138 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1139 | |
9fbee57e DH |
1140 | /* Guile provides an extension to R5RS' define syntax to represent function |
1141 | * currying in a compact way. With this extension, it is allowed to write | |
1142 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1143 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1144 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1145 | * should be either a sequence of zero or more variables, or a sequence of one | |
1146 | * or more variables followed by a space-delimited period and another | |
1147 | * variable. Each level of argument nesting wraps the <body> within another | |
1148 | * lambda expression. For example, the following forms are allowed, each one | |
1149 | * followed by an equivalent, more explicit implementation. | |
1150 | * Example 1: | |
1151 | * (define ((a b . c) . d) <body>) is equivalent to | |
1152 | * (define a (lambda (b . c) (lambda d <body>))) | |
1153 | * Example 2: | |
1154 | * (define (((a) b) c . d) <body>) is equivalent to | |
1155 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1156 | */ | |
1157 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1158 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1159 | static SCM |
1160 | canonicalize_define (const SCM expr) | |
5280aaca | 1161 | { |
cc56ba80 DH |
1162 | SCM body; |
1163 | SCM variable; | |
1164 | ||
1165 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1166 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1167 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1168 | ||
1169 | body = SCM_CDR (cdr_expr); | |
1170 | variable = SCM_CAR (cdr_expr); | |
a61f4e0c | 1171 | while (scm_is_pair (variable)) |
5280aaca | 1172 | { |
cc56ba80 DH |
1173 | /* This while loop realizes function currying by variable nesting. |
1174 | * Variable is known to be a nested-variable. In every iteration of the | |
1175 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1176 | * innermost one. Note that we don't check for duplicate formals here: |
1177 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1178 | const SCM formals = SCM_CDR (variable); |
1179 | const SCM tail = scm_cons (formals, body); | |
1180 | ||
1181 | /* Add source properties to each new lambda expression: */ | |
1182 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1183 | ||
1184 | body = scm_list_1 (lambda); | |
1185 | variable = SCM_CAR (variable); | |
5280aaca | 1186 | } |
cc95e00a | 1187 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
cc56ba80 DH |
1188 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); |
1189 | ||
0f572ba7 DH |
1190 | SCM_SETCAR (cdr_expr, variable); |
1191 | SCM_SETCDR (cdr_expr, body); | |
1192 | return expr; | |
1193 | } | |
1194 | ||
36245b66 DH |
1195 | /* According to section 5.2.1 of R5RS we first have to make sure that the |
1196 | * variable is bound, and then perform the (set! variable expression) | |
1197 | * operation. This means, that within the expression we may already assign | |
1198 | * values to variable: (define foo (begin (set! foo 1) (+ foo 1))) */ | |
0f572ba7 DH |
1199 | SCM |
1200 | scm_m_define (SCM expr, SCM env) | |
1201 | { | |
6bff1368 | 1202 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 1203 | |
6bff1368 DH |
1204 | { |
1205 | const SCM canonical_definition = canonicalize_define (expr); | |
1206 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1207 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
36245b66 DH |
1208 | const SCM location |
1209 | = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); | |
1210 | const SCM value = scm_eval_car (SCM_CDR (cdr_canonical_definition), env); | |
6bff1368 | 1211 | |
6bff1368 DH |
1212 | if (SCM_REC_PROCNAMES_P) |
1213 | { | |
1214 | SCM tmp = value; | |
1215 | while (SCM_MACROP (tmp)) | |
1216 | tmp = SCM_MACRO_CODE (tmp); | |
1217 | if (SCM_CLOSUREP (tmp) | |
1218 | /* Only the first definition determines the name. */ | |
7888309b | 1219 | && scm_is_false (scm_procedure_property (tmp, scm_sym_name))) |
6bff1368 DH |
1220 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); |
1221 | } | |
0f572ba7 | 1222 | |
36245b66 | 1223 | SCM_VARIABLE_SET (location, value); |
6bff1368 DH |
1224 | |
1225 | return SCM_UNSPECIFIED; | |
1226 | } | |
0f2d19dd JB |
1227 | } |
1228 | ||
1229 | ||
8ae95199 DH |
1230 | /* This is a helper function for forms (<keyword> <expression>) that are |
1231 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1232 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1233 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1234 | static SCM | |
1235 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1236 | { | |
1237 | const SCM cdr_expr = SCM_CDR (expr); | |
1238 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1239 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1240 | ||
1241 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1242 | ||
1243 | return expr; | |
1244 | } | |
1245 | ||
1246 | ||
3b88ed2a | 1247 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1248 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1249 | |
9fbee57e DH |
1250 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1251 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1252 | * the empty list represents the empty parameter list. This representation | |
1253 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1254 | SCM |
8ae95199 | 1255 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1256 | { |
8ae95199 DH |
1257 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1258 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1259 | return new_expr; | |
0f2d19dd JB |
1260 | } |
1261 | ||
212e58ed DH |
1262 | static SCM |
1263 | unmemoize_delay (const SCM expr, const SCM env) | |
1264 | { | |
1265 | const SCM thunk_expr = SCM_CADDR (expr); | |
1266 | return scm_list_2 (scm_sym_delay, unmemoize_expression (thunk_expr, env)); | |
1267 | } | |
1268 | ||
8ea46249 | 1269 | |
a954ce1d DH |
1270 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1271 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1272 | ||
302c12b4 | 1273 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1274 | * reversed here. During the evaluation this allows for simple consing of the |
1275 | * results of the inits and steps: | |
302c12b4 | 1276 | |
0f2d19dd | 1277 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1278 | (<var2> <init2>) |
1279 | ... ) | |
1280 | (<test> <return>) | |
1281 | <body>) | |
302c12b4 | 1282 | |
0f2d19dd | 1283 | ;; becomes |
302c12b4 | 1284 | |
e681d187 | 1285 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1286 | (varn ... var2 var1) |
1287 | (<test> <return>) | |
1288 | (<body>) | |
1289 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1290 | */ |
0f2d19dd | 1291 | SCM |
a954ce1d | 1292 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1293 | { |
a954ce1d DH |
1294 | SCM variables = SCM_EOL; |
1295 | SCM init_forms = SCM_EOL; | |
1296 | SCM step_forms = SCM_EOL; | |
1297 | SCM binding_idx; | |
1298 | SCM cddr_expr; | |
1299 | SCM exit_clause; | |
1300 | SCM commands; | |
1301 | SCM tail; | |
1302 | ||
1303 | const SCM cdr_expr = SCM_CDR (expr); | |
1304 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1305 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1306 | ||
1307 | /* Collect variables, init and step forms. */ | |
1308 | binding_idx = SCM_CAR (cdr_expr); | |
1309 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1310 | s_bad_bindings, binding_idx, expr); | |
a61f4e0c | 1311 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1312 | { |
a954ce1d DH |
1313 | const SCM binding = SCM_CAR (binding_idx); |
1314 | const long length = scm_ilength (binding); | |
1315 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1316 | s_bad_binding, binding, expr); | |
1317 | ||
302c12b4 | 1318 | { |
a954ce1d DH |
1319 | const SCM name = SCM_CAR (binding); |
1320 | const SCM init = SCM_CADR (binding); | |
1321 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
cc95e00a | 1322 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
7888309b | 1323 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, variables)), |
4610b011 DH |
1324 | s_duplicate_binding, name, expr); |
1325 | ||
a954ce1d DH |
1326 | variables = scm_cons (name, variables); |
1327 | init_forms = scm_cons (init, init_forms); | |
1328 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1329 | } |
0f2d19dd | 1330 | } |
a954ce1d DH |
1331 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1332 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1333 | ||
1334 | /* Memoize the test form and the exit sequence. */ | |
1335 | cddr_expr = SCM_CDR (cdr_expr); | |
1336 | exit_clause = SCM_CAR (cddr_expr); | |
1337 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1338 | s_bad_exit_clause, exit_clause, expr); | |
1339 | ||
1340 | commands = SCM_CDR (cddr_expr); | |
1341 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1342 | tail = scm_cons2 (init_forms, variables, tail); | |
1343 | SCM_SETCAR (expr, SCM_IM_DO); | |
1344 | SCM_SETCDR (expr, tail); | |
1345 | return expr; | |
0f2d19dd JB |
1346 | } |
1347 | ||
212e58ed DH |
1348 | static SCM |
1349 | unmemoize_do (const SCM expr, const SCM env) | |
1350 | { | |
1351 | const SCM cdr_expr = SCM_CDR (expr); | |
1352 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1353 | const SCM rnames = SCM_CAR (cddr_expr); | |
1354 | const SCM extended_env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
1355 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1356 | const SCM exit_sequence = SCM_CAR (cdddr_expr); | |
1357 | const SCM um_exit_sequence = unmemoize_exprs (exit_sequence, extended_env); | |
1358 | const SCM cddddr_expr = SCM_CDR (cdddr_expr); | |
1359 | const SCM um_body = unmemoize_exprs (SCM_CAR (cddddr_expr), extended_env); | |
1360 | ||
1361 | /* build transformed binding list */ | |
1362 | SCM um_names = scm_reverse (rnames); | |
1363 | SCM um_inits = unmemoize_exprs (SCM_CAR (cdr_expr), env); | |
1364 | SCM um_steps = unmemoize_exprs (SCM_CDR (cddddr_expr), extended_env); | |
1365 | SCM um_bindings = SCM_EOL; | |
a61f4e0c | 1366 | while (!scm_is_null (um_names)) |
212e58ed DH |
1367 | { |
1368 | const SCM name = SCM_CAR (um_names); | |
1369 | const SCM init = SCM_CAR (um_inits); | |
1370 | SCM step = SCM_CAR (um_steps); | |
bc36d050 | 1371 | step = scm_is_eq (step, name) ? SCM_EOL : scm_list_1 (step); |
212e58ed DH |
1372 | |
1373 | um_bindings = scm_cons (scm_cons2 (name, init, step), um_bindings); | |
1374 | ||
1375 | um_names = SCM_CDR (um_names); | |
1376 | um_inits = SCM_CDR (um_inits); | |
1377 | um_steps = SCM_CDR (um_steps); | |
1378 | } | |
1379 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); | |
1380 | ||
1381 | return scm_cons (scm_sym_do, | |
1382 | scm_cons2 (um_bindings, um_exit_sequence, um_body)); | |
1383 | } | |
1384 | ||
b8229a3b | 1385 | |
3b88ed2a | 1386 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1387 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1388 | |
9fbee57e | 1389 | SCM |
4610b011 | 1390 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1391 | { |
4610b011 DH |
1392 | const SCM cdr_expr = SCM_CDR (expr); |
1393 | const long length = scm_ilength (cdr_expr); | |
1394 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1395 | SCM_SETCAR (expr, SCM_IM_IF); | |
1396 | return expr; | |
0f2d19dd JB |
1397 | } |
1398 | ||
212e58ed DH |
1399 | static SCM |
1400 | unmemoize_if (const SCM expr, const SCM env) | |
1401 | { | |
1402 | const SCM cdr_expr = SCM_CDR (expr); | |
1403 | const SCM um_condition = unmemoize_expression (SCM_CAR (cdr_expr), env); | |
1404 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1405 | const SCM um_then = unmemoize_expression (SCM_CAR (cddr_expr), env); | |
1406 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1407 | ||
a61f4e0c | 1408 | if (scm_is_null (cdddr_expr)) |
212e58ed DH |
1409 | { |
1410 | return scm_list_3 (scm_sym_if, um_condition, um_then); | |
1411 | } | |
1412 | else | |
1413 | { | |
1414 | const SCM um_else = unmemoize_expression (SCM_CAR (cdddr_expr), env); | |
1415 | return scm_list_4 (scm_sym_if, um_condition, um_then, um_else); | |
1416 | } | |
1417 | } | |
1418 | ||
302c12b4 | 1419 | |
3b88ed2a | 1420 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1421 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1422 | |
4610b011 DH |
1423 | /* A helper function for memoize_lambda to support checking for duplicate |
1424 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1425 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1426 | * forms that a formal argument can have: | |
1427 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1428 | static int |
4610b011 | 1429 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1430 | { |
a61f4e0c | 1431 | for (; scm_is_pair (list); list = SCM_CDR (list)) |
9fbee57e | 1432 | { |
bc36d050 | 1433 | if (scm_is_eq (SCM_CAR (list), obj)) |
4610b011 | 1434 | return 1; |
9fbee57e | 1435 | } |
bc36d050 | 1436 | return scm_is_eq (list, obj); |
5cb22e96 DH |
1437 | } |
1438 | ||
28d52ebb | 1439 | SCM |
03a3e941 | 1440 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1441 | { |
9fbee57e | 1442 | SCM formals; |
03a3e941 | 1443 | SCM formals_idx; |
34adf7ea DH |
1444 | SCM cddr_expr; |
1445 | int documentation; | |
1446 | SCM body; | |
1447 | SCM new_body; | |
03a3e941 DH |
1448 | |
1449 | const SCM cdr_expr = SCM_CDR (expr); | |
1450 | const long length = scm_ilength (cdr_expr); | |
1451 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1452 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1453 | |
03a3e941 DH |
1454 | /* Before iterating the list of formal arguments, make sure the formals |
1455 | * actually are given as either a symbol or a non-cyclic list. */ | |
1456 | formals = SCM_CAR (cdr_expr); | |
a61f4e0c | 1457 | if (scm_is_pair (formals)) |
03a3e941 DH |
1458 | { |
1459 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1460 | * detected, report a 'Bad formals' error. */ | |
1461 | } | |
1462 | else | |
1463 | { | |
a61f4e0c | 1464 | ASSERT_SYNTAX_2 (scm_is_symbol (formals) || scm_is_null (formals), |
03a3e941 DH |
1465 | s_bad_formals, formals, expr); |
1466 | } | |
1cc91f1b | 1467 | |
03a3e941 DH |
1468 | /* Now iterate the list of formal arguments to check if all formals are |
1469 | * symbols, and that there are no duplicates. */ | |
1470 | formals_idx = formals; | |
a61f4e0c | 1471 | while (scm_is_pair (formals_idx)) |
0f2d19dd | 1472 | { |
03a3e941 DH |
1473 | const SCM formal = SCM_CAR (formals_idx); |
1474 | const SCM next_idx = SCM_CDR (formals_idx); | |
cc95e00a | 1475 | ASSERT_SYNTAX_2 (scm_is_symbol (formal), s_bad_formal, formal, expr); |
03a3e941 DH |
1476 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), |
1477 | s_duplicate_formal, formal, expr); | |
1478 | formals_idx = next_idx; | |
0f2d19dd | 1479 | } |
a61f4e0c | 1480 | ASSERT_SYNTAX_2 (scm_is_null (formals_idx) || scm_is_symbol (formals_idx), |
03a3e941 | 1481 | s_bad_formal, formals_idx, expr); |
9fbee57e | 1482 | |
34adf7ea DH |
1483 | /* Memoize the body. Keep a potential documentation string. */ |
1484 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1485 | * some external database. Otherwise it will slow down execution, since | |
1486 | * the documentation string will have to be skipped with every execution | |
1487 | * of the closure. */ | |
1488 | cddr_expr = SCM_CDR (cdr_expr); | |
7f9994d9 | 1489 | documentation = (length >= 3 && scm_is_string (SCM_CAR (cddr_expr))); |
34adf7ea | 1490 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; |
430b8401 | 1491 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1492 | |
1493 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1494 | if (documentation) | |
1495 | SCM_SETCDR (cddr_expr, new_body); | |
1496 | else | |
1497 | SCM_SETCDR (cdr_expr, new_body); | |
1498 | return expr; | |
0f2d19dd | 1499 | } |
6dbd0af5 | 1500 | |
212e58ed DH |
1501 | static SCM |
1502 | unmemoize_lambda (const SCM expr, const SCM env) | |
1503 | { | |
1504 | const SCM formals = SCM_CADR (expr); | |
1505 | const SCM body = SCM_CDDR (expr); | |
1506 | ||
1507 | const SCM new_env = SCM_EXTEND_ENV (formals, SCM_EOL, env); | |
1508 | const SCM um_formals = scm_i_finite_list_copy (formals); | |
1509 | const SCM um_body = unmemoize_exprs (body, new_env); | |
1510 | ||
1511 | return scm_cons2 (scm_sym_lambda, um_formals, um_body); | |
1512 | } | |
1513 | ||
0f2d19dd | 1514 | |
d6754c23 | 1515 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1516 | static void |
d6754c23 | 1517 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1518 | { |
d6754c23 | 1519 | SCM binding_idx; |
302c12b4 | 1520 | |
d6754c23 DH |
1521 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1522 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1523 | |
d6754c23 | 1524 | binding_idx = bindings; |
a61f4e0c | 1525 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1526 | { |
d6754c23 DH |
1527 | SCM name; /* const */ |
1528 | ||
1529 | const SCM binding = SCM_CAR (binding_idx); | |
1530 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1531 | s_bad_binding, binding, expr); | |
1532 | ||
1533 | name = SCM_CAR (binding); | |
cc95e00a | 1534 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
0f2d19dd | 1535 | } |
d6754c23 | 1536 | } |
26d5b9b4 | 1537 | |
d6754c23 DH |
1538 | |
1539 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1540 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1541 | * variables are returned in a list with their order reversed, and the init | |
1542 | * forms are returned in a list in the same order as they are given in the | |
1543 | * bindings. If a duplicate variable name is detected, an error is | |
1544 | * signalled. */ | |
1545 | static void | |
1546 | transform_bindings ( | |
1547 | const SCM bindings, const SCM expr, | |
1548 | SCM *const rvarptr, SCM *const initptr ) | |
1549 | { | |
1550 | SCM rvariables = SCM_EOL; | |
1551 | SCM rinits = SCM_EOL; | |
1552 | SCM binding_idx = bindings; | |
a61f4e0c | 1553 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
d6754c23 DH |
1554 | { |
1555 | const SCM binding = SCM_CAR (binding_idx); | |
1556 | const SCM cdr_binding = SCM_CDR (binding); | |
1557 | const SCM name = SCM_CAR (binding); | |
7888309b | 1558 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rvariables)), |
d6754c23 DH |
1559 | s_duplicate_binding, name, expr); |
1560 | rvariables = scm_cons (name, rvariables); | |
1561 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1562 | } | |
1563 | *rvarptr = rvariables; | |
1564 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1565 | } |
1566 | ||
302c12b4 | 1567 | |
3b88ed2a | 1568 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1569 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1570 | |
d6754c23 DH |
1571 | /* This function is a helper function for memoize_let. It transforms |
1572 | * (let name ((var init) ...) body ...) into | |
1573 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1574 | * and memoizes the expression. It is assumed that the caller has checked | |
1575 | * that name is a symbol and that there are bindings and a body. */ | |
1576 | static SCM | |
1577 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1578 | { | |
1579 | SCM rvariables; | |
1580 | SCM variables; | |
1581 | SCM inits; | |
1582 | ||
1583 | const SCM cdr_expr = SCM_CDR (expr); | |
1584 | const SCM name = SCM_CAR (cdr_expr); | |
1585 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1586 | const SCM bindings = SCM_CAR (cddr_expr); | |
1587 | check_bindings (bindings, expr); | |
1588 | ||
1589 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1590 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1591 | ||
1592 | { | |
1593 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1594 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1595 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1596 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1597 | ||
1598 | const SCM rvar = scm_list_1 (name); | |
1599 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1600 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1601 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1602 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1603 | return scm_cons_source (expr, letrec_form, inits); | |
1604 | } | |
1605 | } | |
1606 | ||
1607 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1608 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1609 | SCM |
d6754c23 | 1610 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1611 | { |
d6754c23 DH |
1612 | SCM bindings; |
1613 | ||
1614 | const SCM cdr_expr = SCM_CDR (expr); | |
1615 | const long length = scm_ilength (cdr_expr); | |
1616 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1617 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1618 | |
d6754c23 | 1619 | bindings = SCM_CAR (cdr_expr); |
cc95e00a | 1620 | if (scm_is_symbol (bindings)) |
26d5b9b4 | 1621 | { |
d6754c23 DH |
1622 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1623 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1624 | } |
d6754c23 DH |
1625 | |
1626 | check_bindings (bindings, expr); | |
a61f4e0c | 1627 | if (scm_is_null (bindings) || scm_is_null (SCM_CDR (bindings))) |
26d5b9b4 | 1628 | { |
d6754c23 | 1629 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1630 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1631 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1632 | } |
302c12b4 DH |
1633 | else |
1634 | { | |
d6754c23 DH |
1635 | /* plain let */ |
1636 | SCM rvariables; | |
1637 | SCM inits; | |
1638 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1639 | |
302c12b4 | 1640 | { |
430b8401 | 1641 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1642 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1643 | SCM_SETCAR (expr, SCM_IM_LET); | |
1644 | SCM_SETCDR (expr, new_tail); | |
1645 | return expr; | |
302c12b4 DH |
1646 | } |
1647 | } | |
0f2d19dd JB |
1648 | } |
1649 | ||
212e58ed DH |
1650 | static SCM |
1651 | build_binding_list (SCM rnames, SCM rinits) | |
1652 | { | |
1653 | SCM bindings = SCM_EOL; | |
a61f4e0c | 1654 | while (!scm_is_null (rnames)) |
212e58ed DH |
1655 | { |
1656 | const SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); | |
1657 | bindings = scm_cons (binding, bindings); | |
1658 | rnames = SCM_CDR (rnames); | |
1659 | rinits = SCM_CDR (rinits); | |
1660 | } | |
1661 | return bindings; | |
1662 | } | |
1663 | ||
1664 | static SCM | |
1665 | unmemoize_let (const SCM expr, const SCM env) | |
1666 | { | |
1667 | const SCM cdr_expr = SCM_CDR (expr); | |
1668 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1669 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1670 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1671 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), env); | |
1672 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1673 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1674 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1675 | ||
1676 | return scm_cons2 (scm_sym_let, um_bindings, um_body); | |
1677 | } | |
1678 | ||
1679 | ||
1680 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); | |
1681 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); | |
1682 | ||
1683 | SCM | |
1684 | scm_m_letrec (SCM expr, SCM env) | |
1685 | { | |
1686 | SCM bindings; | |
1687 | ||
1688 | const SCM cdr_expr = SCM_CDR (expr); | |
1689 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1690 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1691 | ||
1692 | bindings = SCM_CAR (cdr_expr); | |
a61f4e0c | 1693 | if (scm_is_null (bindings)) |
212e58ed DH |
1694 | { |
1695 | /* no bindings, let* is executed faster */ | |
1696 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1697 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); | |
1698 | } | |
1699 | else | |
1700 | { | |
1701 | SCM rvariables; | |
1702 | SCM inits; | |
1703 | SCM new_body; | |
1704 | ||
1705 | check_bindings (bindings, expr); | |
1706 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1707 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1708 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | static SCM | |
1713 | unmemoize_letrec (const SCM expr, const SCM env) | |
1714 | { | |
1715 | const SCM cdr_expr = SCM_CDR (expr); | |
1716 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1717 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1718 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1719 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), extended_env); | |
1720 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1721 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1722 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1723 | ||
1724 | return scm_cons2 (scm_sym_letrec, um_bindings, um_body); | |
1725 | } | |
1726 | ||
1727 | ||
0f2d19dd | 1728 | |
3b88ed2a | 1729 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1730 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1731 | |
d6754c23 DH |
1732 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1733 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1734 | SCM |
d6754c23 | 1735 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1736 | { |
d6754c23 | 1737 | SCM binding_idx; |
d6754c23 | 1738 | SCM new_body; |
0f2d19dd | 1739 | |
d6754c23 DH |
1740 | const SCM cdr_expr = SCM_CDR (expr); |
1741 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1742 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1743 | |
d6754c23 DH |
1744 | binding_idx = SCM_CAR (cdr_expr); |
1745 | check_bindings (binding_idx, expr); | |
1746 | ||
461bffb1 DH |
1747 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1748 | * transformation is done in place. At the beginning of one iteration of | |
1749 | * the loop the variable binding_idx holds the form | |
1750 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1751 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1752 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1753 | * untouched. After the execution of the loop, P1 will hold | |
1754 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1755 | * and binding_idx will hold P3. */ | |
a61f4e0c | 1756 | while (!scm_is_null (binding_idx)) |
9fbee57e | 1757 | { |
461bffb1 | 1758 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1759 | const SCM binding = SCM_CAR (binding_idx); |
1760 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1761 | const SCM cdr_binding = SCM_CDR (binding); |
1762 | ||
1763 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1764 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1765 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1766 | ||
1767 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1768 | } |
1769 | ||
430b8401 | 1770 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1771 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1772 | /* the bindings have been changed in place */ | |
1773 | SCM_SETCDR (cdr_expr, new_body); | |
1774 | return expr; | |
9fbee57e | 1775 | } |
b8229a3b | 1776 | |
212e58ed DH |
1777 | static SCM |
1778 | unmemoize_letstar (const SCM expr, const SCM env) | |
0f2d19dd | 1779 | { |
d6754c23 | 1780 | const SCM cdr_expr = SCM_CDR (expr); |
212e58ed DH |
1781 | const SCM body = SCM_CDR (cdr_expr); |
1782 | SCM bindings = SCM_CAR (cdr_expr); | |
1783 | SCM um_bindings = SCM_EOL; | |
1784 | SCM extended_env = env; | |
1785 | SCM um_body; | |
d6754c23 | 1786 | |
a61f4e0c | 1787 | while (!scm_is_null (bindings)) |
9fbee57e | 1788 | { |
212e58ed DH |
1789 | const SCM variable = SCM_CAR (bindings); |
1790 | const SCM init = SCM_CADR (bindings); | |
1791 | const SCM um_init = unmemoize_expression (init, extended_env); | |
1792 | um_bindings = scm_cons (scm_list_2 (variable, um_init), um_bindings); | |
1793 | extended_env = SCM_EXTEND_ENV (variable, SCM_BOOL_F, extended_env); | |
1794 | bindings = SCM_CDDR (bindings); | |
9fbee57e | 1795 | } |
212e58ed | 1796 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); |
d6754c23 | 1797 | |
212e58ed DH |
1798 | um_body = unmemoize_exprs (body, extended_env); |
1799 | ||
1800 | return scm_cons2 (scm_sym_letstar, um_bindings, um_body); | |
0f2d19dd JB |
1801 | } |
1802 | ||
73b64342 | 1803 | |
3b88ed2a | 1804 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1805 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1806 | |
1807 | SCM | |
21628685 | 1808 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1809 | { |
21628685 DH |
1810 | const SCM cdr_expr = SCM_CDR (expr); |
1811 | const long length = scm_ilength (cdr_expr); | |
1812 | ||
1813 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1814 | ||
1815 | if (length == 0) | |
1816 | { | |
1817 | /* Special case: (or) is replaced by #f. */ | |
1818 | return SCM_BOOL_F; | |
1819 | } | |
9fbee57e | 1820 | else |
21628685 DH |
1821 | { |
1822 | SCM_SETCAR (expr, SCM_IM_OR); | |
1823 | return expr; | |
1824 | } | |
73b64342 MD |
1825 | } |
1826 | ||
212e58ed DH |
1827 | static SCM |
1828 | unmemoize_or (const SCM expr, const SCM env) | |
1829 | { | |
1830 | return scm_cons (scm_sym_or, unmemoize_exprs (SCM_CDR (expr), env)); | |
1831 | } | |
1832 | ||
73b64342 | 1833 | |
9fbee57e DH |
1834 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1835 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1836 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1837 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1838 | |
1839 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1840 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1841 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1842 | * nesting level and is known to be greater than zero. */ | |
1843 | static SCM | |
1844 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1845 | { |
a61f4e0c | 1846 | if (scm_is_pair (form)) |
c96d76b8 | 1847 | { |
21628685 | 1848 | const SCM tmp = SCM_CAR (form); |
bc36d050 | 1849 | if (scm_is_eq (tmp, scm_sym_quasiquote)) |
9fbee57e | 1850 | { |
21628685 DH |
1851 | const SCM args = SCM_CDR (form); |
1852 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1853 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1854 | } | |
bc36d050 | 1855 | else if (scm_is_eq (tmp, scm_sym_unquote)) |
9fbee57e | 1856 | { |
21628685 DH |
1857 | const SCM args = SCM_CDR (form); |
1858 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1859 | if (depth - 1 == 0) |
1860 | return scm_eval_car (args, env); | |
1861 | else | |
1862 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1863 | } | |
a61f4e0c | 1864 | else if (scm_is_pair (tmp) |
bc36d050 | 1865 | && scm_is_eq (SCM_CAR (tmp), scm_sym_uq_splicing)) |
9fbee57e | 1866 | { |
21628685 DH |
1867 | const SCM args = SCM_CDR (tmp); |
1868 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1869 | if (depth - 1 == 0) |
1870 | { | |
21628685 DH |
1871 | const SCM list = scm_eval_car (args, env); |
1872 | const SCM rest = SCM_CDR (form); | |
1873 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1874 | s_splicing, list, form); | |
9fbee57e DH |
1875 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1876 | } | |
1877 | else | |
1878 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1879 | iqq (SCM_CDR (form), env, depth)); | |
1880 | } | |
1881 | else | |
1882 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1883 | iqq (SCM_CDR (form), env, depth)); | |
1884 | } | |
4057a3e0 MV |
1885 | else if (scm_is_vector (form)) |
1886 | return scm_vector (iqq (scm_vector_to_list (form), env, depth)); | |
9fbee57e DH |
1887 | else |
1888 | return form; | |
1889 | } | |
1890 | ||
1891 | SCM | |
21628685 | 1892 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1893 | { |
21628685 DH |
1894 | const SCM cdr_expr = SCM_CDR (expr); |
1895 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1896 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1897 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1898 | } |
1899 | ||
1900 | ||
3b88ed2a | 1901 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1902 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1903 | ||
1904 | SCM | |
21628685 | 1905 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1906 | { |
21628685 DH |
1907 | SCM quotee; |
1908 | ||
1909 | const SCM cdr_expr = SCM_CDR (expr); | |
1910 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1911 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1912 | quotee = SCM_CAR (cdr_expr); | |
5fb64383 | 1913 | if (is_self_quoting_p (quotee)) |
21628685 | 1914 | return quotee; |
e7313a9d | 1915 | |
21628685 | 1916 | SCM_SETCAR (expr, SCM_IM_QUOTE); |
e7313a9d | 1917 | SCM_SETCDR (expr, quotee); |
21628685 | 1918 | return expr; |
9fbee57e DH |
1919 | } |
1920 | ||
e7313a9d DH |
1921 | static SCM |
1922 | unmemoize_quote (const SCM expr, const SCM env SCM_UNUSED) | |
1923 | { | |
1924 | return scm_list_2 (scm_sym_quote, SCM_CDR (expr)); | |
1925 | } | |
1926 | ||
9fbee57e DH |
1927 | |
1928 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1929 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1930 | static const char s_set_x[] = "set!"; |
1931 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1932 | ||
1933 | SCM | |
82b3e2c6 | 1934 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1935 | { |
82b3e2c6 | 1936 | SCM variable; |
36245b66 | 1937 | SCM new_variable; |
82b3e2c6 DH |
1938 | |
1939 | const SCM cdr_expr = SCM_CDR (expr); | |
1940 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1941 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1942 | variable = SCM_CAR (cdr_expr); | |
36245b66 DH |
1943 | |
1944 | /* Memoize the variable form. */ | |
cc95e00a | 1945 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
36245b66 | 1946 | new_variable = lookup_symbol (variable, env); |
36245b66 DH |
1947 | /* Leave the memoization of unbound symbols to lazy memoization: */ |
1948 | if (SCM_UNBNDP (new_variable)) | |
1949 | new_variable = variable; | |
82b3e2c6 DH |
1950 | |
1951 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
36245b66 | 1952 | SCM_SETCAR (cdr_expr, new_variable); |
82b3e2c6 | 1953 | return expr; |
9fbee57e DH |
1954 | } |
1955 | ||
212e58ed DH |
1956 | static SCM |
1957 | unmemoize_set_x (const SCM expr, const SCM env) | |
1958 | { | |
1959 | return scm_cons (scm_sym_set_x, unmemoize_exprs (SCM_CDR (expr), env)); | |
1960 | } | |
1961 | ||
9fbee57e DH |
1962 | |
1963 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1964 | ||
1965 | ||
3b88ed2a | 1966 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1967 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1968 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1969 | ||
1970 | SCM | |
82b3e2c6 | 1971 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1972 | { |
82b3e2c6 DH |
1973 | const SCM cdr_expr = SCM_CDR (expr); |
1974 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1975 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1976 | |
82b3e2c6 DH |
1977 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1978 | return expr; | |
1979 | } | |
2e171178 | 1980 | |
212e58ed DH |
1981 | static SCM |
1982 | unmemoize_apply (const SCM expr, const SCM env) | |
1983 | { | |
1984 | return scm_list_2 (scm_sym_atapply, unmemoize_exprs (SCM_CDR (expr), env)); | |
1985 | } | |
1986 | ||
2e171178 | 1987 | |
3b88ed2a | 1988 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1989 | |
82b3e2c6 DH |
1990 | /* FIXME: The following explanation should go into the documentation: */ |
1991 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1992 | * the global variables named by `var's (symbols, not evaluated), creating | |
1993 | * them if they don't exist, executes body, and then restores the previous | |
1994 | * values of the `var's. Additionally, whenever control leaves body, the | |
1995 | * values of the `var's are saved and restored when control returns. It is an | |
1996 | * error when a symbol appears more than once among the `var's. All `init's | |
1997 | * are evaluated before any `var' is set. | |
1998 | * | |
1999 | * Think of this as `let' for dynamic scope. | |
2000 | */ | |
2001 | ||
2002 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
2003 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
2004 | * | |
2005 | * FIXME - also implement `@bind*'. | |
2006 | */ | |
73b64342 | 2007 | SCM |
82b3e2c6 | 2008 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 2009 | { |
82b3e2c6 DH |
2010 | SCM bindings; |
2011 | SCM rvariables; | |
2012 | SCM inits; | |
2013 | SCM variable_idx; | |
2e171178 | 2014 | |
82b3e2c6 | 2015 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 2016 | |
82b3e2c6 DH |
2017 | const SCM cdr_expr = SCM_CDR (expr); |
2018 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2019 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
2020 | bindings = SCM_CAR (cdr_expr); | |
2021 | check_bindings (bindings, expr); | |
2022 | transform_bindings (bindings, expr, &rvariables, &inits); | |
2023 | ||
2024 | for (variable_idx = rvariables; | |
a61f4e0c | 2025 | !scm_is_null (variable_idx); |
82b3e2c6 | 2026 | variable_idx = SCM_CDR (variable_idx)) |
73b64342 | 2027 | { |
82b3e2c6 DH |
2028 | /* The first call to scm_sym2var will look beyond the current module, |
2029 | * while the second call wont. */ | |
2030 | const SCM variable = SCM_CAR (variable_idx); | |
2031 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
7888309b | 2032 | if (scm_is_false (new_variable)) |
82b3e2c6 DH |
2033 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); |
2034 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 2035 | } |
82b3e2c6 DH |
2036 | |
2037 | SCM_SETCAR (expr, SCM_IM_BIND); | |
2038 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
2039 | return expr; | |
73b64342 | 2040 | } |
73b64342 | 2041 | |
b0c5d67b | 2042 | |
3b88ed2a | 2043 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
2044 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
2045 | ||
9fbee57e | 2046 | SCM |
da48db62 | 2047 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2048 | { |
da48db62 DH |
2049 | const SCM cdr_expr = SCM_CDR (expr); |
2050 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2051 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2052 | ||
2053 | SCM_SETCAR (expr, SCM_IM_CONT); | |
2054 | return expr; | |
b0c5d67b | 2055 | } |
b0c5d67b | 2056 | |
212e58ed DH |
2057 | static SCM |
2058 | unmemoize_atcall_cc (const SCM expr, const SCM env) | |
2059 | { | |
2060 | return scm_list_2 (scm_sym_atcall_cc, unmemoize_exprs (SCM_CDR (expr), env)); | |
2061 | } | |
2062 | ||
b0c5d67b | 2063 | |
3b88ed2a | 2064 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 2065 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
2066 | |
2067 | SCM | |
da48db62 | 2068 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2069 | { |
da48db62 DH |
2070 | const SCM cdr_expr = SCM_CDR (expr); |
2071 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2072 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2073 | ||
2074 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
2075 | return expr; | |
b0c5d67b | 2076 | } |
b0c5d67b | 2077 | |
212e58ed DH |
2078 | static SCM |
2079 | unmemoize_at_call_with_values (const SCM expr, const SCM env) | |
2080 | { | |
2081 | return scm_list_2 (scm_sym_at_call_with_values, | |
2082 | unmemoize_exprs (SCM_CDR (expr), env)); | |
2083 | } | |
2084 | ||
b0c5d67b | 2085 | |
3b88ed2a | 2086 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 2087 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 2088 | |
9fbee57e DH |
2089 | /* Like promises, futures are implemented as closures with an empty |
2090 | * parameter list. Thus, (future <expression>) is transformed into | |
2091 | * (#@future '() <expression>), where the empty list represents the | |
2092 | * empty parameter list. This representation allows for easy creation | |
2093 | * of the closure during evaluation. */ | |
a513ead3 | 2094 | SCM |
8ae95199 | 2095 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 2096 | { |
8ae95199 DH |
2097 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
2098 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
2099 | return new_expr; | |
a513ead3 MV |
2100 | } |
2101 | ||
212e58ed DH |
2102 | static SCM |
2103 | unmemoize_future (const SCM expr, const SCM env) | |
2104 | { | |
2105 | const SCM thunk_expr = SCM_CADDR (expr); | |
2106 | return scm_list_2 (scm_sym_future, unmemoize_expression (thunk_expr, env)); | |
2107 | } | |
2108 | ||
9fbee57e | 2109 | |
3b88ed2a | 2110 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
2111 | SCM_SYMBOL (scm_sym_setter, "setter"); |
2112 | ||
2113 | SCM | |
7893dbbf | 2114 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 2115 | { |
7893dbbf | 2116 | SCM target, exp_target; |
da48db62 DH |
2117 | |
2118 | const SCM cdr_expr = SCM_CDR (expr); | |
2119 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2120 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2121 | ||
2122 | target = SCM_CAR (cdr_expr); | |
a61f4e0c | 2123 | if (!scm_is_pair (target)) |
da48db62 DH |
2124 | { |
2125 | /* R5RS usage */ | |
2126 | return scm_m_set_x (expr, env); | |
2127 | } | |
9fbee57e | 2128 | else |
da48db62 DH |
2129 | { |
2130 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
2131 | /* Macroexpanding the target might return things of the form |
2132 | (begin <atom>). In that case, <atom> must be a symbol or a | |
2133 | variable and we memoize to (set! <atom> ...). | |
2134 | */ | |
2b189e65 | 2135 | exp_target = macroexp (target, env); |
bc36d050 | 2136 | if (scm_is_eq (SCM_CAR (exp_target), SCM_IM_BEGIN) |
a61f4e0c MV |
2137 | && !scm_is_null (SCM_CDR (exp_target)) |
2138 | && scm_is_null (SCM_CDDR (exp_target))) | |
7893dbbf MV |
2139 | { |
2140 | exp_target= SCM_CADR (exp_target); | |
cc95e00a | 2141 | ASSERT_SYNTAX_2 (scm_is_symbol (exp_target) |
6d1a2e9f MV |
2142 | || SCM_VARIABLEP (exp_target), |
2143 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
2144 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
2145 | SCM_CDR (cdr_expr))); | |
2146 | } | |
2147 | else | |
2148 | { | |
2149 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
2150 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
2151 | setter_proc_tail); | |
da48db62 | 2152 | |
7893dbbf MV |
2153 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
2154 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
2155 | cddr_expr)); | |
da48db62 | 2156 | |
7893dbbf MV |
2157 | SCM_SETCAR (expr, setter_proc); |
2158 | SCM_SETCDR (expr, setter_args); | |
2159 | return expr; | |
2160 | } | |
da48db62 | 2161 | } |
9fbee57e DH |
2162 | } |
2163 | ||
2164 | ||
a4aa2134 DH |
2165 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
2166 | * soon as the module system allows us to more freely create bindings in | |
2167 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2168 | * moved here. */ | |
212e58ed DH |
2169 | |
2170 | SCM_SYMBOL (sym_atslot_ref, "@slot-ref"); | |
2171 | ||
9fbee57e | 2172 | SCM |
9a848baf | 2173 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2174 | { |
9a848baf DH |
2175 | SCM slot_nr; |
2176 | ||
2177 | const SCM cdr_expr = SCM_CDR (expr); | |
2178 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2179 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2180 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2181 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9fbee57e | 2182 | |
9a848baf | 2183 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
e7313a9d | 2184 | SCM_SETCDR (cdr_expr, slot_nr); |
9a848baf DH |
2185 | return expr; |
2186 | } | |
9fbee57e | 2187 | |
212e58ed DH |
2188 | static SCM |
2189 | unmemoize_atslot_ref (const SCM expr, const SCM env) | |
2190 | { | |
2191 | const SCM instance = SCM_CADR (expr); | |
2192 | const SCM um_instance = unmemoize_expression (instance, env); | |
2193 | const SCM slot_nr = SCM_CDDR (expr); | |
2194 | return scm_list_3 (sym_atslot_ref, um_instance, slot_nr); | |
2195 | } | |
2196 | ||
9fbee57e | 2197 | |
a4aa2134 DH |
2198 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
2199 | * soon as the module system allows us to more freely create bindings in | |
2200 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2201 | * moved here. */ | |
212e58ed DH |
2202 | |
2203 | SCM_SYMBOL (sym_atslot_set_x, "@slot-set!"); | |
2204 | ||
9fbee57e | 2205 | SCM |
9a848baf | 2206 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2207 | { |
9a848baf DH |
2208 | SCM slot_nr; |
2209 | ||
2210 | const SCM cdr_expr = SCM_CDR (expr); | |
2211 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2212 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
2213 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2214 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9a848baf DH |
2215 | |
2216 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
2217 | return expr; | |
9fbee57e | 2218 | } |
9fbee57e | 2219 | |
212e58ed DH |
2220 | static SCM |
2221 | unmemoize_atslot_set_x (const SCM expr, const SCM env) | |
2222 | { | |
2223 | const SCM cdr_expr = SCM_CDR (expr); | |
2224 | const SCM instance = SCM_CAR (cdr_expr); | |
2225 | const SCM um_instance = unmemoize_expression (instance, env); | |
2226 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
2227 | const SCM slot_nr = SCM_CAR (cddr_expr); | |
2228 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
2229 | const SCM value = SCM_CAR (cdddr_expr); | |
2230 | const SCM um_value = unmemoize_expression (value, env); | |
2231 | return scm_list_4 (sym_atslot_set_x, um_instance, slot_nr, um_value); | |
2232 | } | |
2233 | ||
9fbee57e DH |
2234 | |
2235 | #if SCM_ENABLE_ELISP | |
2236 | ||
70c1c108 DH |
2237 | static const char s_defun[] = "Symbol's function definition is void"; |
2238 | ||
3b88ed2a | 2239 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 2240 | |
70c1c108 DH |
2241 | /* nil-cond expressions have the form |
2242 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 2243 | SCM |
70c1c108 | 2244 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2245 | { |
70c1c108 DH |
2246 | const long length = scm_ilength (SCM_CDR (expr)); |
2247 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
2248 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
2249 | ||
2250 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
2251 | return expr; | |
9fbee57e DH |
2252 | } |
2253 | ||
2254 | ||
3b88ed2a | 2255 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 2256 | |
70c1c108 DH |
2257 | /* The @fop-macro handles procedure and macro applications for elisp. The |
2258 | * input expression must have the form | |
2259 | * (@fop <var> (transformer-macro <expr> ...)) | |
2260 | * where <var> must be a symbol. The expression is transformed into the | |
2261 | * memoized form of either | |
2262 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
2263 | * if the value of var (across all aliasing) is not a macro, or | |
2264 | * (<un-aliased var> <expr> ...) | |
2265 | * if var is a macro. */ | |
9fbee57e | 2266 | SCM |
70c1c108 | 2267 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2268 | { |
70c1c108 DH |
2269 | SCM location; |
2270 | SCM symbol; | |
2271 | ||
2272 | const SCM cdr_expr = SCM_CDR (expr); | |
2273 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2274 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
2275 | ||
2276 | symbol = SCM_CAR (cdr_expr); | |
cc95e00a | 2277 | ASSERT_SYNTAX_2 (scm_is_symbol (symbol), s_bad_variable, symbol, expr); |
70c1c108 DH |
2278 | |
2279 | location = scm_symbol_fref (symbol); | |
2280 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
2281 | ||
2282 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
2283 | * look up such definitions, the chain of symbol definitions has to be | |
2284 | * followed up to the terminal symbol. */ | |
cc95e00a | 2285 | while (scm_is_symbol (SCM_VARIABLE_REF (location))) |
9fbee57e | 2286 | { |
70c1c108 DH |
2287 | const SCM alias = SCM_VARIABLE_REF (location); |
2288 | location = scm_symbol_fref (alias); | |
2289 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 2290 | } |
70c1c108 DH |
2291 | |
2292 | /* Memoize the value location belonging to the terminal symbol. */ | |
2293 | SCM_SETCAR (cdr_expr, location); | |
2294 | ||
2295 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2296 | { |
70c1c108 DH |
2297 | /* Since the location does not contain a macro, the form is a procedure |
2298 | * application. Replace `@fop' by `@apply' and transform the expression | |
2299 | * including the `transformer-macro'. */ | |
2300 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2301 | return expr; | |
2302 | } | |
2303 | else | |
2304 | { | |
2305 | /* Since the location contains a macro, the arguments should not be | |
2306 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2307 | * expression starts with the memoized variable, that is at the cdr of | |
2308 | * the input expression. */ | |
2309 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2310 | return cdr_expr; | |
9fbee57e | 2311 | } |
9fbee57e DH |
2312 | } |
2313 | ||
2314 | #endif /* SCM_ENABLE_ELISP */ | |
2315 | ||
2316 | ||
212e58ed DH |
2317 | static SCM |
2318 | unmemoize_builtin_macro (const SCM expr, const SCM env) | |
2319 | { | |
2320 | switch (ISYMNUM (SCM_CAR (expr))) | |
2321 | { | |
2322 | case (ISYMNUM (SCM_IM_AND)): | |
2323 | return unmemoize_and (expr, env); | |
2324 | ||
2325 | case (ISYMNUM (SCM_IM_BEGIN)): | |
2326 | return unmemoize_begin (expr, env); | |
2327 | ||
2328 | case (ISYMNUM (SCM_IM_CASE)): | |
2329 | return unmemoize_case (expr, env); | |
2330 | ||
2331 | case (ISYMNUM (SCM_IM_COND)): | |
2332 | return unmemoize_cond (expr, env); | |
2333 | ||
2334 | case (ISYMNUM (SCM_IM_DELAY)): | |
2335 | return unmemoize_delay (expr, env); | |
2336 | ||
2337 | case (ISYMNUM (SCM_IM_DO)): | |
2338 | return unmemoize_do (expr, env); | |
2339 | ||
2340 | case (ISYMNUM (SCM_IM_IF)): | |
2341 | return unmemoize_if (expr, env); | |
2342 | ||
2343 | case (ISYMNUM (SCM_IM_LAMBDA)): | |
2344 | return unmemoize_lambda (expr, env); | |
2345 | ||
2346 | case (ISYMNUM (SCM_IM_LET)): | |
2347 | return unmemoize_let (expr, env); | |
2348 | ||
2349 | case (ISYMNUM (SCM_IM_LETREC)): | |
2350 | return unmemoize_letrec (expr, env); | |
2351 | ||
2352 | case (ISYMNUM (SCM_IM_LETSTAR)): | |
2353 | return unmemoize_letstar (expr, env); | |
2354 | ||
2355 | case (ISYMNUM (SCM_IM_OR)): | |
2356 | return unmemoize_or (expr, env); | |
2357 | ||
2358 | case (ISYMNUM (SCM_IM_QUOTE)): | |
2359 | return unmemoize_quote (expr, env); | |
2360 | ||
2361 | case (ISYMNUM (SCM_IM_SET_X)): | |
2362 | return unmemoize_set_x (expr, env); | |
2363 | ||
2364 | case (ISYMNUM (SCM_IM_APPLY)): | |
2365 | return unmemoize_apply (expr, env); | |
2366 | ||
2367 | case (ISYMNUM (SCM_IM_BIND)): | |
2368 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2369 | ||
2370 | case (ISYMNUM (SCM_IM_CONT)): | |
2371 | return unmemoize_atcall_cc (expr, env); | |
2372 | ||
2373 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): | |
2374 | return unmemoize_at_call_with_values (expr, env); | |
2375 | ||
2376 | case (ISYMNUM (SCM_IM_FUTURE)): | |
2377 | return unmemoize_future (expr, env); | |
2378 | ||
2379 | case (ISYMNUM (SCM_IM_SLOT_REF)): | |
2380 | return unmemoize_atslot_ref (expr, env); | |
2381 | ||
2382 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): | |
2383 | return unmemoize_atslot_set_x (expr, env); | |
2384 | ||
2385 | case (ISYMNUM (SCM_IM_NIL_COND)): | |
2386 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2387 | ||
2388 | default: | |
2389 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2390 | } | |
2391 | } | |
2392 | ||
2393 | ||
9fcf3cbb DH |
2394 | /* scm_i_unmemocopy_expr and scm_i_unmemocopy_body take a memoized expression |
2395 | * respectively a memoized body together with its environment and rewrite it | |
2396 | * to its original form. Thus, these functions are the inversion of the | |
2397 | * rewrite rules above. The procedure is not optimized for speed. It's used | |
2398 | * in scm_i_unmemoize_expr, scm_procedure_source, macro_print and scm_iprin1. | |
212e58ed DH |
2399 | * |
2400 | * Unmemoizing is not a reliable process. You cannot in general expect to get | |
2401 | * the original source back. | |
2402 | * | |
2403 | * However, GOOPS currently relies on this for method compilation. This ought | |
2404 | * to change. */ | |
2405 | ||
2406 | SCM | |
9fcf3cbb DH |
2407 | scm_i_unmemocopy_expr (SCM expr, SCM env) |
2408 | { | |
2409 | const SCM source_properties = scm_whash_lookup (scm_source_whash, expr); | |
2410 | const SCM um_expr = unmemoize_expression (expr, env); | |
2411 | ||
7888309b | 2412 | if (scm_is_true (source_properties)) |
9fcf3cbb DH |
2413 | scm_whash_insert (scm_source_whash, um_expr, source_properties); |
2414 | ||
2415 | return um_expr; | |
2416 | } | |
2417 | ||
2418 | SCM | |
2419 | scm_i_unmemocopy_body (SCM forms, SCM env) | |
212e58ed DH |
2420 | { |
2421 | const SCM source_properties = scm_whash_lookup (scm_source_whash, forms); | |
2422 | const SCM um_forms = unmemoize_exprs (forms, env); | |
2423 | ||
7888309b | 2424 | if (scm_is_true (source_properties)) |
212e58ed DH |
2425 | scm_whash_insert (scm_source_whash, um_forms, source_properties); |
2426 | ||
2427 | return um_forms; | |
2428 | } | |
2429 | ||
2430 | ||
434f2f7a | 2431 | #if (SCM_ENABLE_DEPRECATED == 1) |
f58c472a | 2432 | |
434f2f7a DH |
2433 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ |
2434 | SCM | |
2435 | scm_m_expand_body (SCM exprs, SCM env) | |
2436 | { | |
2437 | scm_c_issue_deprecation_warning | |
2438 | ("`scm_m_expand_body' is deprecated."); | |
2439 | m_expand_body (exprs, env); | |
2440 | return exprs; | |
2441 | } | |
f58c472a | 2442 | |
f58c472a DH |
2443 | |
2444 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2445 | ||
2446 | SCM | |
70c1c108 | 2447 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2448 | { |
70c1c108 DH |
2449 | SCM variable; |
2450 | SCM location; | |
2451 | ||
2452 | const SCM cdr_expr = SCM_CDR (expr); | |
2453 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2454 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2455 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2456 | ||
2b189e65 MV |
2457 | scm_c_issue_deprecation_warning |
2458 | ("`undefine' is deprecated.\n"); | |
2459 | ||
70c1c108 | 2460 | variable = SCM_CAR (cdr_expr); |
cc95e00a | 2461 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
70c1c108 | 2462 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); |
7888309b | 2463 | ASSERT_SYNTAX_2 (scm_is_true (location) |
70c1c108 DH |
2464 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), |
2465 | "variable already unbound ", variable, expr); | |
2466 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2467 | return SCM_UNSPECIFIED; |
f58c472a DH |
2468 | } |
2469 | ||
26d5b9b4 MD |
2470 | SCM |
2471 | scm_macroexp (SCM x, SCM env) | |
2472 | { | |
2b189e65 MV |
2473 | scm_c_issue_deprecation_warning |
2474 | ("`scm_macroexp' is deprecated."); | |
2475 | return macroexp (x, env); | |
26d5b9b4 | 2476 | } |
73b64342 | 2477 | |
6f81708a DH |
2478 | #endif |
2479 | ||
60a49842 | 2480 | |
212e58ed | 2481 | #if (SCM_ENABLE_DEPRECATED == 1) |
26d5b9b4 | 2482 | |
212e58ed DH |
2483 | SCM |
2484 | scm_unmemocar (SCM form, SCM env) | |
8ea46249 | 2485 | { |
212e58ed DH |
2486 | scm_c_issue_deprecation_warning |
2487 | ("`scm_unmemocar' is deprecated."); | |
60a49842 | 2488 | |
a61f4e0c | 2489 | if (!scm_is_pair (form)) |
60a49842 DH |
2490 | return form; |
2491 | else | |
2492 | { | |
2493 | SCM c = SCM_CAR (form); | |
2494 | if (SCM_VARIABLEP (c)) | |
2495 | { | |
2496 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
7888309b | 2497 | if (scm_is_false (sym)) |
60a49842 DH |
2498 | sym = sym_three_question_marks; |
2499 | SCM_SETCAR (form, sym); | |
2500 | } | |
2501 | else if (SCM_ILOCP (c)) | |
2502 | { | |
2503 | unsigned long int ir; | |
2504 | ||
2505 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2506 | env = SCM_CDR (env); | |
2507 | env = SCM_CAAR (env); | |
2508 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2509 | env = SCM_CDR (env); | |
f62b9dff | 2510 | |
60a49842 DH |
2511 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2512 | } | |
2513 | return form; | |
2514 | } | |
2515 | } | |
2516 | ||
434f2f7a DH |
2517 | #endif |
2518 | ||
6f81708a DH |
2519 | /*****************************************************************************/ |
2520 | /*****************************************************************************/ | |
2521 | /* The definitions for execution start here. */ | |
2522 | /*****************************************************************************/ | |
2523 | /*****************************************************************************/ | |
2524 | ||
2525 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2526 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2527 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2528 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
2529 | ||
2530 | /* A function object to implement "apply" for non-closure functions. */ | |
2531 | static SCM f_apply; | |
2532 | /* An endless list consisting of #<undefined> objects: */ | |
2533 | static SCM undefineds; | |
2534 | ||
2535 | ||
2536 | int | |
6e8d25a6 | 2537 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2538 | { |
a61f4e0c | 2539 | while (!scm_is_null (formals)) |
0f2d19dd | 2540 | { |
a61f4e0c | 2541 | if (!scm_is_pair (formals)) |
ff467021 | 2542 | return 0; |
a61f4e0c | 2543 | if (scm_is_null (args)) |
ff467021 | 2544 | return 1; |
0f2d19dd JB |
2545 | formals = SCM_CDR (formals); |
2546 | args = SCM_CDR (args); | |
2547 | } | |
a61f4e0c | 2548 | return !scm_is_null (args) ? 1 : 0; |
0f2d19dd | 2549 | } |
a392ee15 | 2550 | |
0f2d19dd | 2551 | \f |
62360b89 | 2552 | |
434f2f7a DH |
2553 | /* The evaluator contains a plethora of EVAL symbols. This is an attempt at |
2554 | * explanation. | |
62360b89 | 2555 | * |
434f2f7a DH |
2556 | * The following macros should be used in code which is read twice (where the |
2557 | * choice of evaluator is hard soldered): | |
62360b89 | 2558 | * |
434f2f7a DH |
2559 | * CEVAL is the symbol used within one evaluator to call itself. |
2560 | * Originally, it is defined to ceval, but is redefined to deval during the | |
2561 | * second pass. | |
62360b89 | 2562 | * |
385609b9 | 2563 | * SCM_I_EVALIM is used when it is known that the expression is an |
62360b89 | 2564 | * immediate. (This macro never calls an evaluator.) |
434f2f7a DH |
2565 | * |
2566 | * EVAL evaluates an expression that is expected to have its symbols already | |
2567 | * memoized. Expressions that are not of the form '(<form> <form> ...)' are | |
2568 | * evaluated inline without calling an evaluator. | |
2569 | * | |
2570 | * EVALCAR evaluates the car of an expression 'X:(Y:<form> <form> ...)', | |
2571 | * potentially replacing a symbol at the position Y:<form> by its memoized | |
2572 | * variable. If Y:<form> is not of the form '(<form> <form> ...)', the | |
2573 | * evaluation is performed inline without calling an evaluator. | |
62360b89 DH |
2574 | * |
2575 | * The following macros should be used in code which is read once | |
2576 | * (where the choice of evaluator is dynamic): | |
2577 | * | |
385609b9 | 2578 | * SCM_I_XEVAL corresponds to EVAL, but uses ceval *or* deval depending on the |
434f2f7a | 2579 | * debugging mode. |
62360b89 | 2580 | * |
385609b9 | 2581 | * SCM_I_XEVALCAR corresponds to EVALCAR, but uses ceval *or* deval depending |
434f2f7a | 2582 | * on the debugging mode. |
62360b89 DH |
2583 | * |
2584 | * The main motivation for keeping this plethora is efficiency | |
2585 | * together with maintainability (=> locality of code). | |
2586 | */ | |
2587 | ||
434f2f7a DH |
2588 | static SCM ceval (SCM x, SCM env); |
2589 | static SCM deval (SCM x, SCM env); | |
2590 | #define CEVAL ceval | |
2591 | ||
62360b89 | 2592 | |
385609b9 | 2593 | #define SCM_I_EVALIM2(x) \ |
bc36d050 | 2594 | ((scm_is_eq ((x), SCM_EOL) \ |
62360b89 DH |
2595 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ |
2596 | : 0), \ | |
2597 | (x)) | |
2598 | ||
385609b9 | 2599 | #define SCM_I_EVALIM(x, env) (SCM_ILOCP (x) \ |
434f2f7a | 2600 | ? *scm_ilookup ((x), (env)) \ |
385609b9 | 2601 | : SCM_I_EVALIM2(x)) |
62360b89 | 2602 | |
385609b9 | 2603 | #define SCM_I_XEVAL(x, env) \ |
434f2f7a | 2604 | (SCM_IMP (x) \ |
385609b9 | 2605 | ? SCM_I_EVALIM2 (x) \ |
434f2f7a DH |
2606 | : (SCM_VARIABLEP (x) \ |
2607 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2608 | : (scm_is_pair (x) \ |
434f2f7a DH |
2609 | ? (scm_debug_mode_p \ |
2610 | ? deval ((x), (env)) \ | |
2611 | : ceval ((x), (env))) \ | |
2612 | : (x)))) | |
2613 | ||
385609b9 | 2614 | #define SCM_I_XEVALCAR(x, env) \ |
434f2f7a | 2615 | (SCM_IMP (SCM_CAR (x)) \ |
385609b9 | 2616 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2617 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2618 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2619 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a DH |
2620 | ? (scm_debug_mode_p \ |
2621 | ? deval (SCM_CAR (x), (env)) \ | |
2622 | : ceval (SCM_CAR (x), (env))) \ | |
cc95e00a | 2623 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2624 | ? SCM_CAR (x) \ |
2625 | : *scm_lookupcar ((x), (env), 1))))) | |
2626 | ||
2627 | #define EVAL(x, env) \ | |
2628 | (SCM_IMP (x) \ | |
385609b9 | 2629 | ? SCM_I_EVALIM ((x), (env)) \ |
434f2f7a DH |
2630 | : (SCM_VARIABLEP (x) \ |
2631 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2632 | : (scm_is_pair (x) \ |
434f2f7a DH |
2633 | ? CEVAL ((x), (env)) \ |
2634 | : (x)))) | |
2635 | ||
2636 | #define EVALCAR(x, env) \ | |
2637 | (SCM_IMP (SCM_CAR (x)) \ | |
385609b9 | 2638 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2639 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2640 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2641 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a | 2642 | ? CEVAL (SCM_CAR (x), (env)) \ |
cc95e00a | 2643 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2644 | ? SCM_CAR (x) \ |
2645 | : *scm_lookupcar ((x), (env), 1))))) | |
62360b89 | 2646 | |
9de87eea | 2647 | scm_i_pthread_mutex_t source_mutex = SCM_I_PTHREAD_RECURSIVE_MUTEX_INITIALIZER; |
62360b89 DH |
2648 | |
2649 | ||
e5156567 DH |
2650 | /* Lookup a given local variable in an environment. The local variable is |
2651 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
2652 | * indicates the relative number of the environment frame (counting upwards | |
2653 | * from the innermost environment frame), binding indicates the number of the | |
2654 | * binding within the frame, and last? (which is extracted from the iloc using | |
2655 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
2656 | * very end of the improper list of bindings. */ | |
2657 | SCM * | |
2658 | scm_ilookup (SCM iloc, SCM env) | |
2659 | { | |
2660 | unsigned int frame_nr = SCM_IFRAME (iloc); | |
2661 | unsigned int binding_nr = SCM_IDIST (iloc); | |
2662 | SCM frames = env; | |
2663 | SCM bindings; | |
2664 | ||
2665 | for (; 0 != frame_nr; --frame_nr) | |
2666 | frames = SCM_CDR (frames); | |
2667 | ||
2668 | bindings = SCM_CAR (frames); | |
2669 | for (; 0 != binding_nr; --binding_nr) | |
2670 | bindings = SCM_CDR (bindings); | |
2671 | ||
2672 | if (SCM_ICDRP (iloc)) | |
2673 | return SCM_CDRLOC (bindings); | |
2674 | return SCM_CARLOC (SCM_CDR (bindings)); | |
2675 | } | |
2676 | ||
2677 | ||
2678 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
2679 | ||
2680 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
2d0c133f MV |
2681 | static void error_defined_variable (SCM symbol) SCM_NORETURN; |
2682 | ||
2683 | /* Call this for variables that are unfound. | |
2684 | */ | |
e5156567 DH |
2685 | static void |
2686 | error_unbound_variable (SCM symbol) | |
2687 | { | |
2688 | scm_error (scm_unbound_variable_key, NULL, | |
2689 | "Unbound variable: ~S", | |
2690 | scm_list_1 (symbol), SCM_BOOL_F); | |
2691 | } | |
2692 | ||
2d0c133f MV |
2693 | /* Call this for variables that are found but contain SCM_UNDEFINED. |
2694 | */ | |
2695 | static void | |
2696 | error_defined_variable (SCM symbol) | |
2697 | { | |
2698 | /* We use the 'unbound-variable' key here as well, since it | |
2699 | basically is the same kind of error, with a slight variation in | |
2700 | the displayed message. | |
2701 | */ | |
2702 | scm_error (scm_unbound_variable_key, NULL, | |
a03bad87 | 2703 | "Variable used before given a value: ~S", |
2d0c133f MV |
2704 | scm_list_1 (symbol), SCM_BOOL_F); |
2705 | } | |
2706 | ||
e5156567 DH |
2707 | |
2708 | /* The Lookup Car Race | |
2709 | - by Eva Luator | |
2710 | ||
2711 | Memoization of variables and special forms is done while executing | |
2712 | the code for the first time. As long as there is only one thread | |
2713 | everything is fine, but as soon as two threads execute the same | |
2714 | code concurrently `for the first time' they can come into conflict. | |
2715 | ||
2716 | This memoization includes rewriting variable references into more | |
2717 | efficient forms and expanding macros. Furthermore, macro expansion | |
2718 | includes `compiling' special forms like `let', `cond', etc. into | |
2719 | tree-code instructions. | |
2720 | ||
2721 | There shouldn't normally be a problem with memoizing local and | |
2722 | global variable references (into ilocs and variables), because all | |
2723 | threads will mutate the code in *exactly* the same way and (if I | |
2724 | read the C code correctly) it is not possible to observe a half-way | |
2725 | mutated cons cell. The lookup procedure can handle this | |
2726 | transparently without any critical sections. | |
2727 | ||
2728 | It is different with macro expansion, because macro expansion | |
2729 | happens outside of the lookup procedure and can't be | |
2730 | undone. Therefore the lookup procedure can't cope with it. It has | |
2731 | to indicate failure when it detects a lost race and hope that the | |
2732 | caller can handle it. Luckily, it turns out that this is the case. | |
2733 | ||
2734 | An example to illustrate this: Suppose that the following form will | |
2735 | be memoized concurrently by two threads | |
2736 | ||
2737 | (let ((x 12)) x) | |
2738 | ||
2739 | Let's first examine the lookup of X in the body. The first thread | |
2740 | decides that it has to find the symbol "x" in the environment and | |
2741 | starts to scan it. Then the other thread takes over and actually | |
2742 | overtakes the first. It looks up "x" and substitutes an | |
2743 | appropriate iloc for it. Now the first thread continues and | |
2744 | completes its lookup. It comes to exactly the same conclusions as | |
2745 | the second one and could - without much ado - just overwrite the | |
2746 | iloc with the same iloc. | |
2747 | ||
2748 | But let's see what will happen when the race occurs while looking | |
2749 | up the symbol "let" at the start of the form. It could happen that | |
2750 | the second thread interrupts the lookup of the first thread and not | |
2751 | only substitutes a variable for it but goes right ahead and | |
2752 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
2753 | the first thread completes its lookup, it would replace the #@let* | |
2754 | with a variable containing the "let" binding, effectively reverting | |
2755 | the form to (let (x 12) x). This is wrong. It has to detect that | |
2756 | it has lost the race and the evaluator has to reconsider the | |
2757 | changed form completely. | |
2758 | ||
2759 | This race condition could be resolved with some kind of traffic | |
2760 | light (like mutexes) around scm_lookupcar, but I think that it is | |
2761 | best to avoid them in this case. They would serialize memoization | |
2762 | completely and because lookup involves calling arbitrary Scheme | |
2763 | code (via the lookup-thunk), threads could be blocked for an | |
2764 | arbitrary amount of time or even deadlock. But with the current | |
2765 | solution a lot of unnecessary work is potentially done. */ | |
2766 | ||
2767 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to | |
2768 | return NULL to indicate a failed lookup due to some race conditions | |
2769 | between threads. This only happens when VLOC is the first cell of | |
2770 | a special form that will eventually be memoized (like `let', etc.) | |
2771 | In that case the whole lookup is bogus and the caller has to | |
2772 | reconsider the complete special form. | |
2773 | ||
2774 | SCM_LOOKUPCAR is still there, of course. It just calls | |
2775 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR | |
2776 | should only be called when it is known that VLOC is not the first | |
2777 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
2778 | for NULL. I think I've found the only places where this | |
2779 | applies. */ | |
2780 | ||
2781 | static SCM * | |
2782 | scm_lookupcar1 (SCM vloc, SCM genv, int check) | |
2783 | { | |
2784 | SCM env = genv; | |
2785 | register SCM *al, fl, var = SCM_CAR (vloc); | |
2786 | register SCM iloc = SCM_ILOC00; | |
2787 | for (; SCM_NIMP (env); env = SCM_CDR (env)) | |
2788 | { | |
a61f4e0c | 2789 | if (!scm_is_pair (SCM_CAR (env))) |
e5156567 DH |
2790 | break; |
2791 | al = SCM_CARLOC (env); | |
2792 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) | |
2793 | { | |
a61f4e0c | 2794 | if (!scm_is_pair (fl)) |
e5156567 | 2795 | { |
bc36d050 | 2796 | if (scm_is_eq (fl, var)) |
e5156567 | 2797 | { |
bc36d050 | 2798 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2799 | goto race; |
2800 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); | |
2801 | return SCM_CDRLOC (*al); | |
2802 | } | |
2803 | else | |
2804 | break; | |
2805 | } | |
2806 | al = SCM_CDRLOC (*al); | |
bc36d050 | 2807 | if (scm_is_eq (SCM_CAR (fl), var)) |
e5156567 DH |
2808 | { |
2809 | if (SCM_UNBNDP (SCM_CAR (*al))) | |
2d0c133f | 2810 | error_defined_variable (var); |
bc36d050 | 2811 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2812 | goto race; |
2813 | SCM_SETCAR (vloc, iloc); | |
2814 | return SCM_CARLOC (*al); | |
2815 | } | |
2816 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); | |
2817 | } | |
2818 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); | |
2819 | } | |
2820 | { | |
2821 | SCM top_thunk, real_var; | |
2822 | if (SCM_NIMP (env)) | |
2823 | { | |
2824 | top_thunk = SCM_CAR (env); /* env now refers to a | |
2825 | top level env thunk */ | |
2826 | env = SCM_CDR (env); | |
2827 | } | |
2828 | else | |
2829 | top_thunk = SCM_BOOL_F; | |
2830 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); | |
7888309b | 2831 | if (scm_is_false (real_var)) |
e5156567 DH |
2832 | goto errout; |
2833 | ||
a61f4e0c | 2834 | if (!scm_is_null (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
e5156567 DH |
2835 | { |
2836 | errout: | |
2837 | if (check) | |
2838 | { | |
a61f4e0c | 2839 | if (scm_is_null (env)) |
e5156567 DH |
2840 | error_unbound_variable (var); |
2841 | else | |
2842 | scm_misc_error (NULL, "Damaged environment: ~S", | |
2843 | scm_list_1 (var)); | |
2844 | } | |
2845 | else | |
2846 | { | |
2847 | /* A variable could not be found, but we shall | |
2848 | not throw an error. */ | |
2849 | static SCM undef_object = SCM_UNDEFINED; | |
2850 | return &undef_object; | |
2851 | } | |
2852 | } | |
2853 | ||
bc36d050 | 2854 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2855 | { |
2856 | /* Some other thread has changed the very cell we are working | |
2857 | on. In effect, it must have done our job or messed it up | |
2858 | completely. */ | |
2859 | race: | |
2860 | var = SCM_CAR (vloc); | |
2861 | if (SCM_VARIABLEP (var)) | |
2862 | return SCM_VARIABLE_LOC (var); | |
2863 | if (SCM_ILOCP (var)) | |
2864 | return scm_ilookup (var, genv); | |
2865 | /* We can't cope with anything else than variables and ilocs. When | |
2866 | a special form has been memoized (i.e. `let' into `#@let') we | |
2867 | return NULL and expect the calling function to do the right | |
2868 | thing. For the evaluator, this means going back and redoing | |
2869 | the dispatch on the car of the form. */ | |
2870 | return NULL; | |
2871 | } | |
2872 | ||
2873 | SCM_SETCAR (vloc, real_var); | |
2874 | return SCM_VARIABLE_LOC (real_var); | |
2875 | } | |
2876 | } | |
2877 | ||
2878 | SCM * | |
2879 | scm_lookupcar (SCM vloc, SCM genv, int check) | |
2880 | { | |
2881 | SCM *loc = scm_lookupcar1 (vloc, genv, check); | |
2882 | if (loc == NULL) | |
2883 | abort (); | |
2884 | return loc; | |
2885 | } | |
2886 | ||
2887 | ||
36245b66 DH |
2888 | /* During execution, look up a symbol in the top level of the given local |
2889 | * environment and return the corresponding variable object. If no binding | |
2890 | * for the symbol can be found, an 'Unbound variable' error is signalled. */ | |
2891 | static SCM | |
2892 | lazy_memoize_variable (const SCM symbol, const SCM environment) | |
2893 | { | |
2894 | const SCM top_level = scm_env_top_level (environment); | |
2895 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
2896 | ||
7888309b | 2897 | if (scm_is_false (variable)) |
36245b66 DH |
2898 | error_unbound_variable (symbol); |
2899 | else | |
2900 | return variable; | |
2901 | } | |
2902 | ||
2903 | ||
62360b89 DH |
2904 | SCM |
2905 | scm_eval_car (SCM pair, SCM env) | |
2906 | { | |
385609b9 | 2907 | return SCM_I_XEVALCAR (pair, env); |
62360b89 DH |
2908 | } |
2909 | ||
2910 | ||
6dbd0af5 | 2911 | SCM |
6e8d25a6 | 2912 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2913 | { |
680ed4a8 | 2914 | SCM results = SCM_EOL, *lloc = &results, res; |
a61f4e0c | 2915 | while (scm_is_pair (l)) |
6dbd0af5 | 2916 | { |
680ed4a8 | 2917 | res = EVALCAR (l, env); |
904a077d | 2918 | |
8ea46249 | 2919 | *lloc = scm_list_1 (res); |
a23afe53 | 2920 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2921 | l = SCM_CDR (l); |
2922 | } | |
a61f4e0c | 2923 | if (!scm_is_null (l)) |
904a077d | 2924 | scm_wrong_num_args (proc); |
680ed4a8 | 2925 | return results; |
6dbd0af5 | 2926 | } |
c4ac4d88 | 2927 | |
d0b07b5d | 2928 | |
9de33deb MD |
2929 | SCM |
2930 | scm_eval_body (SCM code, SCM env) | |
2931 | { | |
2932 | SCM next; | |
434f2f7a | 2933 | |
9de33deb | 2934 | again: |
01f11e02 | 2935 | next = SCM_CDR (code); |
a61f4e0c | 2936 | while (!scm_is_null (next)) |
9de33deb MD |
2937 | { |
2938 | if (SCM_IMP (SCM_CAR (code))) | |
2939 | { | |
2940 | if (SCM_ISYMP (SCM_CAR (code))) | |
2941 | { | |
9de87eea | 2942 | scm_i_scm_pthread_mutex_lock (&source_mutex); |
9bc4701c MD |
2943 | /* check for race condition */ |
2944 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2945 | m_expand_body (code, env); |
9de87eea | 2946 | scm_i_pthread_mutex_unlock (&source_mutex); |
9de33deb MD |
2947 | goto again; |
2948 | } | |
2949 | } | |
2950 | else | |
385609b9 | 2951 | SCM_I_XEVAL (SCM_CAR (code), env); |
9de33deb | 2952 | code = next; |
01f11e02 | 2953 | next = SCM_CDR (code); |
9de33deb | 2954 | } |
385609b9 | 2955 | return SCM_I_XEVALCAR (code, env); |
9de33deb MD |
2956 | } |
2957 | ||
0f2d19dd JB |
2958 | #endif /* !DEVAL */ |
2959 | ||
6dbd0af5 MD |
2960 | |
2961 | /* SECTION: This code is specific for the debugging support. One | |
2962 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2963 | * defined. | |
2964 | */ | |
2965 | ||
2966 | #ifndef DEVAL | |
2967 | ||
2968 | #define SCM_APPLY scm_apply | |
2969 | #define PREP_APPLY(proc, args) | |
2970 | #define ENTER_APPLY | |
ddea3325 | 2971 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2972 | #ifdef STACK_CHECKING |
2973 | #ifndef NO_CEVAL_STACK_CHECKING | |
2974 | #define EVAL_STACK_CHECKING | |
2975 | #endif | |
6dbd0af5 MD |
2976 | #endif |
2977 | ||
2978 | #else /* !DEVAL */ | |
2979 | ||
434f2f7a DH |
2980 | #undef CEVAL |
2981 | #define CEVAL deval /* Substitute all uses of ceval */ | |
2982 | ||
0f2d19dd JB |
2983 | #undef SCM_APPLY |
2984 | #define SCM_APPLY scm_dapply | |
434f2f7a | 2985 | |
6dbd0af5 MD |
2986 | #undef PREP_APPLY |
2987 | #define PREP_APPLY(p, l) \ | |
2988 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
434f2f7a | 2989 | |
6dbd0af5 MD |
2990 | #undef ENTER_APPLY |
2991 | #define ENTER_APPLY \ | |
d3a6bc94 | 2992 | do { \ |
b7ff98dd | 2993 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2994 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2995 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2996 | {\ |
7888309b | 2997 | SCM tmp, tail = scm_from_bool(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2998 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2999 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 3000 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 3001 | {\ |
c0ab1b8d | 3002 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 3003 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 3004 | }\ |
6dbd0af5 MD |
3005 | else\ |
3006 | {\ | |
5f144b10 GH |
3007 | int first;\ |
3008 | tmp = scm_make_continuation (&first);\ | |
3009 | if (first)\ | |
d95c0b76 | 3010 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 3011 | }\ |
d95c0b76 | 3012 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 3013 | }\ |
d3a6bc94 | 3014 | } while (0) |
434f2f7a | 3015 | |
0f2d19dd | 3016 | #undef RETURN |
ddea3325 | 3017 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
434f2f7a | 3018 | |
b7ff98dd MD |
3019 | #ifdef STACK_CHECKING |
3020 | #ifndef EVAL_STACK_CHECKING | |
3021 | #define EVAL_STACK_CHECKING | |
3022 | #endif | |
6dbd0af5 MD |
3023 | #endif |
3024 | ||
0f2d19dd | 3025 | |
434f2f7a DH |
3026 | /* scm_last_debug_frame contains a pointer to the last debugging information |
3027 | * stack frame. It is accessed very often from the debugging evaluator, so it | |
3028 | * should probably not be indirectly addressed. Better to save and restore it | |
3029 | * from the current root at any stack swaps. | |
6dbd0af5 MD |
3030 | */ |
3031 | ||
6dbd0af5 MD |
3032 | /* scm_debug_eframe_size is the number of slots available for pseudo |
3033 | * stack frames at each real stack frame. | |
3034 | */ | |
3035 | ||
c014a02e | 3036 | long scm_debug_eframe_size; |
6dbd0af5 | 3037 | |
434f2f7a DH |
3038 | int scm_debug_mode_p; |
3039 | int scm_check_entry_p; | |
3040 | int scm_check_apply_p; | |
3041 | int scm_check_exit_p; | |
6dbd0af5 | 3042 | |
c014a02e | 3043 | long scm_eval_stack; |
a74145b8 | 3044 | |
92c2555f | 3045 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 3046 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
3047 | }; |
3048 | ||
92c2555f | 3049 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
3050 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
3051 | "*Flyweight representation of the stack at traps." }, | |
3052 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
3053 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
3054 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
3055 | "Record procedure names at definition." }, | |
3056 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
3057 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 3058 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
3059 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
3060 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 3061 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
3062 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
3063 | "Maximal number of stored backtrace frames." }, | |
3064 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
3065 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
3066 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 3067 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
65bc1f7a MV |
3068 | { 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."}, |
3069 | { SCM_OPTION_BOOLEAN, "warn-deprecated", 0, "Warn when deprecated features are used." } | |
6dbd0af5 MD |
3070 | }; |
3071 | ||
92c2555f | 3072 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 3073 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
3074 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
3075 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
3076 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
3077 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
3078 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
3079 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
3080 | }; |
3081 | ||
a1ec6916 | 3082 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 3083 | (SCM setting), |
b3f26b14 MG |
3084 | "Option interface for the evaluation options. Instead of using\n" |
3085 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 3086 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 3087 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
3088 | { |
3089 | SCM ans; | |
9de87eea | 3090 | SCM_CRITICAL_SECTION_START; |
33b97402 MD |
3091 | ans = scm_options (setting, |
3092 | scm_eval_opts, | |
3093 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 3094 | FUNC_NAME); |
a74145b8 | 3095 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
9de87eea | 3096 | SCM_CRITICAL_SECTION_END; |
33b97402 MD |
3097 | return ans; |
3098 | } | |
1bbd0b84 | 3099 | #undef FUNC_NAME |
33b97402 | 3100 | |
d0b07b5d | 3101 | |
a1ec6916 | 3102 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 3103 | (SCM setting), |
b3f26b14 | 3104 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 3105 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
3106 | { |
3107 | SCM ans; | |
9de87eea | 3108 | SCM_CRITICAL_SECTION_START; |
33b97402 MD |
3109 | ans = scm_options (setting, |
3110 | scm_evaluator_trap_table, | |
3111 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 3112 | FUNC_NAME); |
33b97402 | 3113 | SCM_RESET_DEBUG_MODE; |
9de87eea | 3114 | SCM_CRITICAL_SECTION_END; |
33b97402 MD |
3115 | return ans; |
3116 | } | |
1bbd0b84 | 3117 | #undef FUNC_NAME |
33b97402 | 3118 | |
d0b07b5d | 3119 | |
24933780 | 3120 | static SCM |
a392ee15 | 3121 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 3122 | { |
b1cb24ff | 3123 | SCM *results = lloc; |
a61f4e0c | 3124 | while (scm_is_pair (l)) |
0f2d19dd | 3125 | { |
b1cb24ff | 3126 | const SCM res = EVALCAR (l, env); |
904a077d | 3127 | |
8ea46249 | 3128 | *lloc = scm_list_1 (res); |
a23afe53 | 3129 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
3130 | l = SCM_CDR (l); |
3131 | } | |
a61f4e0c | 3132 | if (!scm_is_null (l)) |
904a077d | 3133 | scm_wrong_num_args (proc); |
680ed4a8 | 3134 | return *results; |
0f2d19dd JB |
3135 | } |
3136 | ||
6dbd0af5 MD |
3137 | #endif /* !DEVAL */ |
3138 | ||
3139 | ||
a392ee15 | 3140 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
3141 | */ |
3142 | ||
a392ee15 | 3143 | |
d9d39d76 | 3144 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 3145 | * current module. */ |
d9d39d76 MV |
3146 | #define UPDATE_TOPLEVEL_ENV(env) \ |
3147 | do { \ | |
3148 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 3149 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
3150 | env = scm_top_level_env (p); \ |
3151 | } while (0) | |
3152 | ||
6dbd0af5 | 3153 | |
6f81708a | 3154 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
bc36d050 | 3155 | ASSERT_SYNTAX (!scm_is_eq ((x), SCM_EOL), s_empty_combination, x) |
6f81708a DH |
3156 | |
3157 | ||
a392ee15 DH |
3158 | /* This is the evaluator. Like any real monster, it has three heads: |
3159 | * | |
434f2f7a DH |
3160 | * ceval is the non-debugging evaluator, deval is the debugging version. Both |
3161 | * are implemented using a common code base, using the following mechanism: | |
3162 | * CEVAL is a macro, which is either defined to ceval or deval. Thus, there | |
3163 | * is no function CEVAL, but the code for CEVAL actually compiles to either | |
3164 | * ceval or deval. When CEVAL is defined to ceval, it is known that the macro | |
3165 | * DEVAL is not defined. When CEVAL is defined to deval, then the macro DEVAL | |
3166 | * is known to be defined. Thus, in CEVAL parts for the debugging evaluator | |
a392ee15 DH |
3167 | * are enclosed within #ifdef DEVAL ... #endif. |
3168 | * | |
434f2f7a DH |
3169 | * All three (ceval, deval and their common implementation CEVAL) take two |
3170 | * input parameters, x and env: x is a single expression to be evalutated. | |
3171 | * env is the environment in which bindings are searched. | |
a392ee15 | 3172 | * |
434f2f7a DH |
3173 | * x is known to be a pair. Since x is a single expression, it is necessarily |
3174 | * in a tail position. If x is just a call to another function like in the | |
3175 | * expression (foo exp1 exp2 ...), the realization of that call therefore | |
3176 | * _must_not_ increase stack usage (the evaluation of exp1, exp2 etc., | |
3177 | * however, may do so). This is realized by making extensive use of 'goto' | |
3178 | * statements within the evaluator: The gotos replace recursive calls to | |
3179 | * CEVAL, thus re-using the same stack frame that CEVAL was already using. | |
3180 | * If, however, x represents some form that requires to evaluate a sequence of | |
3181 | * expressions like (begin exp1 exp2 ...), then recursive calls to CEVAL are | |
3182 | * performed for all but the last expression of that sequence. */ | |
6dbd0af5 | 3183 | |
434f2f7a DH |
3184 | static SCM |
3185 | CEVAL (SCM x, SCM env) | |
0f2d19dd | 3186 | { |
42030fb2 | 3187 | SCM proc, arg1; |
6dbd0af5 | 3188 | #ifdef DEVAL |
92c2555f MV |
3189 | scm_t_debug_frame debug; |
3190 | scm_t_debug_info *debug_info_end; | |
9de87eea | 3191 | debug.prev = scm_i_last_debug_frame (); |
020c890c | 3192 | debug.status = 0; |
04b6c081 | 3193 | /* |
92c2555f | 3194 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
3195 | * user has specified with (debug-set! frames <n>). |
3196 | * | |
3197 | * Even frames are eval frames, odd frames are apply frames. | |
3198 | */ | |
92c2555f | 3199 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 3200 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
3201 | debug.info = debug.vect; |
3202 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
9de87eea | 3203 | scm_i_set_last_debug_frame (&debug); |
6dbd0af5 | 3204 | #endif |
b7ff98dd | 3205 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 3206 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 3207 | { |
b7ff98dd | 3208 | #ifdef DEVAL |
6dbd0af5 MD |
3209 | debug.info->e.exp = x; |
3210 | debug.info->e.env = env; | |
b7ff98dd | 3211 | #endif |
6dbd0af5 MD |
3212 | scm_report_stack_overflow (); |
3213 | } | |
3214 | #endif | |
6a0f6ff3 | 3215 | |
6dbd0af5 MD |
3216 | #ifdef DEVAL |
3217 | goto start; | |
3218 | #endif | |
6a0f6ff3 | 3219 | |
6dbd0af5 MD |
3220 | loop: |
3221 | #ifdef DEVAL | |
b7ff98dd MD |
3222 | SCM_CLEAR_ARGSREADY (debug); |
3223 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 3224 | --debug.info; |
04b6c081 MD |
3225 | /* |
3226 | * In theory, this should be the only place where it is necessary to | |
3227 | * check for space in debug.vect since both eval frames and | |
3228 | * available space are even. | |
3229 | * | |
3230 | * For this to be the case, however, it is necessary that primitive | |
3231 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 3232 | * label call PREP_APPLY. |
04b6c081 | 3233 | */ |
c0ab1b8d | 3234 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 3235 | { |
b7ff98dd | 3236 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
3237 | debug.info -= 2; |
3238 | } | |
6a0f6ff3 | 3239 | |
6dbd0af5 MD |
3240 | start: |
3241 | debug.info->e.exp = x; | |
3242 | debug.info->e.env = env; | |
5132eef0 DH |
3243 | if (scm_check_entry_p && SCM_TRAPS_P) |
3244 | { | |
bc76d628 DH |
3245 | if (SCM_ENTER_FRAME_P |
3246 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 3247 | { |
bc76d628 | 3248 | SCM stackrep; |
7888309b | 3249 | SCM tail = scm_from_bool (SCM_TAILRECP (debug)); |
5132eef0 DH |
3250 | SCM_SET_TAILREC (debug); |
3251 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 3252 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
3253 | else |
3254 | { | |
3255 | int first; | |
3256 | SCM val = scm_make_continuation (&first); | |
3257 | ||
3258 | if (first) | |
bc76d628 | 3259 | stackrep = val; |
5132eef0 DH |
3260 | else |
3261 | { | |
3262 | x = val; | |
3263 | if (SCM_IMP (x)) | |
3264 | RETURN (x); | |
3265 | else | |
3266 | /* This gives the possibility for the debugger to | |
3267 | modify the source expression before evaluation. */ | |
3268 | goto dispatch; | |
3269 | } | |
3270 | } | |
3271 | SCM_TRAPS_P = 0; | |
3272 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
3273 | scm_sym_enter_frame, | |
bc76d628 | 3274 | stackrep, |
5132eef0 | 3275 | tail, |
212e58ed | 3276 | unmemoize_expression (x, env)); |
5132eef0 DH |
3277 | SCM_TRAPS_P = 1; |
3278 | } | |
3279 | } | |
6dbd0af5 | 3280 | #endif |
f8769b1d | 3281 | dispatch: |
9cb5124f | 3282 | SCM_TICK; |
dec40cd2 | 3283 | if (SCM_ISYMP (SCM_CAR (x))) |
0f2d19dd | 3284 | { |
7e6e6b37 | 3285 | switch (ISYMNUM (SCM_CAR (x))) |
dec40cd2 | 3286 | { |
7e6e6b37 | 3287 | case (ISYMNUM (SCM_IM_AND)): |
dec40cd2 | 3288 | x = SCM_CDR (x); |
a61f4e0c | 3289 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3290 | { |
3291 | SCM test_result = EVALCAR (x, env); | |
7888309b | 3292 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3293 | RETURN (SCM_BOOL_F); |
3294 | else | |
3295 | x = SCM_CDR (x); | |
3296 | } | |
3297 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3298 | goto carloop; | |
0f2d19dd | 3299 | |
7e6e6b37 | 3300 | case (ISYMNUM (SCM_IM_BEGIN)): |
dec40cd2 | 3301 | x = SCM_CDR (x); |
a61f4e0c | 3302 | if (scm_is_null (x)) |
dec40cd2 | 3303 | RETURN (SCM_UNSPECIFIED); |
b8113bc8 | 3304 | |
dec40cd2 | 3305 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd | 3306 | |
dec40cd2 DH |
3307 | begin: |
3308 | /* If we are on toplevel with a lookup closure, we need to sync | |
3309 | with the current module. */ | |
a61f4e0c | 3310 | if (scm_is_pair (env) && !scm_is_pair (SCM_CAR (env))) |
dec40cd2 DH |
3311 | { |
3312 | UPDATE_TOPLEVEL_ENV (env); | |
a61f4e0c | 3313 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3314 | { |
3315 | EVALCAR (x, env); | |
3316 | UPDATE_TOPLEVEL_ENV (env); | |
3317 | x = SCM_CDR (x); | |
3318 | } | |
3319 | goto carloop; | |
3320 | } | |
3321 | else | |
3322 | goto nontoplevel_begin; | |
5280aaca | 3323 | |
dec40cd2 | 3324 | nontoplevel_begin: |
a61f4e0c | 3325 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 | 3326 | { |
b1cb24ff | 3327 | const SCM form = SCM_CAR (x); |
dec40cd2 DH |
3328 | if (SCM_IMP (form)) |
3329 | { | |
3330 | if (SCM_ISYMP (form)) | |
3331 | { | |
9de87eea | 3332 | scm_i_scm_pthread_mutex_lock (&source_mutex); |
dec40cd2 DH |
3333 | /* check for race condition */ |
3334 | if (SCM_ISYMP (SCM_CAR (x))) | |
3335 | m_expand_body (x, env); | |
9de87eea | 3336 | scm_i_pthread_mutex_unlock (&source_mutex); |
dec40cd2 DH |
3337 | goto nontoplevel_begin; |
3338 | } | |
3339 | else | |
3340 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); | |
3341 | } | |
3342 | else | |
b1cb24ff | 3343 | (void) EVAL (form, env); |
dec40cd2 DH |
3344 | x = SCM_CDR (x); |
3345 | } | |
b1cb24ff | 3346 | |
dec40cd2 DH |
3347 | carloop: |
3348 | { | |
3349 | /* scm_eval last form in list */ | |
b1cb24ff | 3350 | const SCM last_form = SCM_CAR (x); |
0f2d19dd | 3351 | |
a61f4e0c | 3352 | if (scm_is_pair (last_form)) |
dec40cd2 DH |
3353 | { |
3354 | /* This is by far the most frequent case. */ | |
3355 | x = last_form; | |
3356 | goto loop; /* tail recurse */ | |
3357 | } | |
3358 | else if (SCM_IMP (last_form)) | |
385609b9 | 3359 | RETURN (SCM_I_EVALIM (last_form, env)); |
dec40cd2 DH |
3360 | else if (SCM_VARIABLEP (last_form)) |
3361 | RETURN (SCM_VARIABLE_REF (last_form)); | |
cc95e00a | 3362 | else if (scm_is_symbol (last_form)) |
dec40cd2 DH |
3363 | RETURN (*scm_lookupcar (x, env, 1)); |
3364 | else | |
3365 | RETURN (last_form); | |
3366 | } | |
0f2d19dd JB |
3367 | |
3368 | ||
7e6e6b37 | 3369 | case (ISYMNUM (SCM_IM_CASE)): |
dec40cd2 DH |
3370 | x = SCM_CDR (x); |
3371 | { | |
b1cb24ff | 3372 | const SCM key = EVALCAR (x, env); |
dec40cd2 | 3373 | x = SCM_CDR (x); |
a61f4e0c | 3374 | while (!scm_is_null (x)) |
dec40cd2 | 3375 | { |
b1cb24ff | 3376 | const SCM clause = SCM_CAR (x); |
dec40cd2 | 3377 | SCM labels = SCM_CAR (clause); |
bc36d050 | 3378 | if (scm_is_eq (labels, SCM_IM_ELSE)) |
dec40cd2 DH |
3379 | { |
3380 | x = SCM_CDR (clause); | |
3381 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3382 | goto begin; | |
3383 | } | |
a61f4e0c | 3384 | while (!scm_is_null (labels)) |
dec40cd2 | 3385 | { |
b1cb24ff | 3386 | const SCM label = SCM_CAR (labels); |
bc36d050 | 3387 | if (scm_is_eq (label, key) |
7888309b | 3388 | || scm_is_true (scm_eqv_p (label, key))) |
dec40cd2 DH |
3389 | { |
3390 | x = SCM_CDR (clause); | |
3391 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3392 | goto begin; | |
3393 | } | |
3394 | labels = SCM_CDR (labels); | |
3395 | } | |
3396 | x = SCM_CDR (x); | |
3397 | } | |
3398 | } | |
3399 | RETURN (SCM_UNSPECIFIED); | |
0f2d19dd JB |
3400 | |
3401 | ||
7e6e6b37 | 3402 | case (ISYMNUM (SCM_IM_COND)): |
dec40cd2 | 3403 | x = SCM_CDR (x); |
a61f4e0c | 3404 | while (!scm_is_null (x)) |
dec40cd2 | 3405 | { |
b1cb24ff | 3406 | const SCM clause = SCM_CAR (x); |
bc36d050 | 3407 | if (scm_is_eq (SCM_CAR (clause), SCM_IM_ELSE)) |
dec40cd2 DH |
3408 | { |
3409 | x = SCM_CDR (clause); | |
3410 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3411 | goto begin; | |
3412 | } | |
3413 | else | |
3414 | { | |
3415 | arg1 = EVALCAR (clause, env); | |
7888309b | 3416 | if (scm_is_true (arg1) && !SCM_NILP (arg1)) |
dec40cd2 DH |
3417 | { |
3418 | x = SCM_CDR (clause); | |
a61f4e0c | 3419 | if (scm_is_null (x)) |
dec40cd2 | 3420 | RETURN (arg1); |
bc36d050 | 3421 | else if (!scm_is_eq (SCM_CAR (x), SCM_IM_ARROW)) |
dec40cd2 DH |
3422 | { |
3423 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3424 | goto begin; | |
3425 | } | |
3426 | else | |
3427 | { | |
3428 | proc = SCM_CDR (x); | |
3429 | proc = EVALCAR (proc, env); | |
3430 | PREP_APPLY (proc, scm_list_1 (arg1)); | |
3431 | ENTER_APPLY; | |
3432 | goto evap1; | |
3433 | } | |
3434 | } | |
3435 | x = SCM_CDR (x); | |
3436 | } | |
3437 | } | |
3438 | RETURN (SCM_UNSPECIFIED); | |
e5cb71a0 | 3439 | |
e5cb71a0 | 3440 | |
7e6e6b37 | 3441 | case (ISYMNUM (SCM_IM_DO)): |
dec40cd2 DH |
3442 | x = SCM_CDR (x); |
3443 | { | |
3444 | /* Compute the initialization values and the initial environment. */ | |
3445 | SCM init_forms = SCM_CAR (x); | |
3446 | SCM init_values = SCM_EOL; | |
a61f4e0c | 3447 | while (!scm_is_null (init_forms)) |
dec40cd2 DH |
3448 | { |
3449 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3450 | init_forms = SCM_CDR (init_forms); | |
3451 | } | |
3452 | x = SCM_CDR (x); | |
3453 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3454 | } | |
3455 | x = SCM_CDR (x); | |
3456 | { | |
3457 | SCM test_form = SCM_CAR (x); | |
3458 | SCM body_forms = SCM_CADR (x); | |
3459 | SCM step_forms = SCM_CDDR (x); | |
e5cb71a0 | 3460 | |
dec40cd2 | 3461 | SCM test_result = EVALCAR (test_form, env); |
e5cb71a0 | 3462 | |
7888309b | 3463 | while (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3464 | { |
3465 | { | |
3466 | /* Evaluate body forms. */ | |
3467 | SCM temp_forms; | |
3468 | for (temp_forms = body_forms; | |
a61f4e0c | 3469 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3470 | temp_forms = SCM_CDR (temp_forms)) |
3471 | { | |
3472 | SCM form = SCM_CAR (temp_forms); | |
b1cb24ff DH |
3473 | /* Dirk:FIXME: We only need to eval forms that may have |
3474 | * a side effect here. This is only true for forms that | |
3475 | * start with a pair. All others are just constants. | |
3476 | * Since with the current memoizer 'form' may hold a | |
3477 | * constant, we call EVAL here to handle the constant | |
3478 | * cases. In the long run it would make sense to have | |
3479 | * the macro transformer of 'do' eliminate all forms | |
3480 | * that have no sideeffect. Then instead of EVAL we | |
3481 | * could call CEVAL directly here. */ | |
3482 | (void) EVAL (form, env); | |
dec40cd2 DH |
3483 | } |
3484 | } | |
0f2d19dd | 3485 | |
dec40cd2 DH |
3486 | { |
3487 | /* Evaluate the step expressions. */ | |
3488 | SCM temp_forms; | |
3489 | SCM step_values = SCM_EOL; | |
3490 | for (temp_forms = step_forms; | |
a61f4e0c | 3491 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3492 | temp_forms = SCM_CDR (temp_forms)) |
3493 | { | |
b1cb24ff | 3494 | const SCM value = EVALCAR (temp_forms, env); |
dec40cd2 DH |
3495 | step_values = scm_cons (value, step_values); |
3496 | } | |
3497 | env = SCM_EXTEND_ENV (SCM_CAAR (env), | |
3498 | step_values, | |
3499 | SCM_CDR (env)); | |
3500 | } | |
0f2d19dd | 3501 | |
dec40cd2 DH |
3502 | test_result = EVALCAR (test_form, env); |
3503 | } | |
3504 | } | |
3505 | x = SCM_CDAR (x); | |
a61f4e0c | 3506 | if (scm_is_null (x)) |
dec40cd2 DH |
3507 | RETURN (SCM_UNSPECIFIED); |
3508 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3509 | goto nontoplevel_begin; | |
0f2d19dd JB |
3510 | |
3511 | ||
7e6e6b37 | 3512 | case (ISYMNUM (SCM_IM_IF)): |
dec40cd2 DH |
3513 | x = SCM_CDR (x); |
3514 | { | |
3515 | SCM test_result = EVALCAR (x, env); | |
3516 | x = SCM_CDR (x); /* then expression */ | |
7888309b | 3517 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3518 | { |
3519 | x = SCM_CDR (x); /* else expression */ | |
a61f4e0c | 3520 | if (scm_is_null (x)) |
dec40cd2 DH |
3521 | RETURN (SCM_UNSPECIFIED); |
3522 | } | |
3523 | } | |
3524 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3525 | goto carloop; | |
0f2d19dd JB |
3526 | |
3527 | ||
7e6e6b37 | 3528 | case (ISYMNUM (SCM_IM_LET)): |
dec40cd2 DH |
3529 | x = SCM_CDR (x); |
3530 | { | |
3531 | SCM init_forms = SCM_CADR (x); | |
3532 | SCM init_values = SCM_EOL; | |
3533 | do | |
3534 | { | |
3535 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3536 | init_forms = SCM_CDR (init_forms); | |
3537 | } | |
a61f4e0c | 3538 | while (!scm_is_null (init_forms)); |
dec40cd2 DH |
3539 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
3540 | } | |
3541 | x = SCM_CDDR (x); | |
3542 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3543 | goto nontoplevel_begin; | |
0f2d19dd JB |
3544 | |
3545 | ||
7e6e6b37 | 3546 | case (ISYMNUM (SCM_IM_LETREC)): |
dec40cd2 DH |
3547 | x = SCM_CDR (x); |
3548 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); | |
3549 | x = SCM_CDR (x); | |
3550 | { | |
3551 | SCM init_forms = SCM_CAR (x); | |
3552 | SCM init_values = SCM_EOL; | |
3553 | do | |
3554 | { | |
3555 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3556 | init_forms = SCM_CDR (init_forms); | |
3557 | } | |
a61f4e0c | 3558 | while (!scm_is_null (init_forms)); |
dec40cd2 DH |
3559 | SCM_SETCDR (SCM_CAR (env), init_values); |
3560 | } | |
3561 | x = SCM_CDR (x); | |
3562 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3563 | goto nontoplevel_begin; | |
0f2d19dd | 3564 | |
302c12b4 | 3565 | |
7e6e6b37 | 3566 | case (ISYMNUM (SCM_IM_LETSTAR)): |
dec40cd2 DH |
3567 | x = SCM_CDR (x); |
3568 | { | |
3569 | SCM bindings = SCM_CAR (x); | |
a61f4e0c | 3570 | if (!scm_is_null (bindings)) |
dec40cd2 DH |
3571 | { |
3572 | do | |
3573 | { | |
3574 | SCM name = SCM_CAR (bindings); | |
3575 | SCM init = SCM_CDR (bindings); | |
3576 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); | |
3577 | bindings = SCM_CDR (init); | |
3578 | } | |
a61f4e0c | 3579 | while (!scm_is_null (bindings)); |
dec40cd2 DH |
3580 | } |
3581 | } | |
3582 | x = SCM_CDR (x); | |
3583 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3584 | goto nontoplevel_begin; | |
0f2d19dd JB |
3585 | |
3586 | ||
7e6e6b37 | 3587 | case (ISYMNUM (SCM_IM_OR)): |
dec40cd2 | 3588 | x = SCM_CDR (x); |
a61f4e0c | 3589 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3590 | { |
3591 | SCM val = EVALCAR (x, env); | |
7888309b | 3592 | if (scm_is_true (val) && !SCM_NILP (val)) |
dec40cd2 DH |
3593 | RETURN (val); |
3594 | else | |
3595 | x = SCM_CDR (x); | |
3596 | } | |
3597 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3598 | goto carloop; | |
0f2d19dd JB |
3599 | |
3600 | ||
7e6e6b37 | 3601 | case (ISYMNUM (SCM_IM_LAMBDA)): |
dec40cd2 | 3602 | RETURN (scm_closure (SCM_CDR (x), env)); |
0f2d19dd JB |
3603 | |
3604 | ||
7e6e6b37 | 3605 | case (ISYMNUM (SCM_IM_QUOTE)): |
e7313a9d | 3606 | RETURN (SCM_CDR (x)); |
0f2d19dd JB |
3607 | |
3608 | ||
7e6e6b37 | 3609 | case (ISYMNUM (SCM_IM_SET_X)): |
dec40cd2 DH |
3610 | x = SCM_CDR (x); |
3611 | { | |
3612 | SCM *location; | |
3613 | SCM variable = SCM_CAR (x); | |
3614 | if (SCM_ILOCP (variable)) | |
3615 | location = scm_ilookup (variable, env); | |
3616 | else if (SCM_VARIABLEP (variable)) | |
3617 | location = SCM_VARIABLE_LOC (variable); | |
36245b66 DH |
3618 | else |
3619 | { | |
cc95e00a | 3620 | /* (scm_is_symbol (variable)) is known to be true */ |
36245b66 DH |
3621 | variable = lazy_memoize_variable (variable, env); |
3622 | SCM_SETCAR (x, variable); | |
3623 | location = SCM_VARIABLE_LOC (variable); | |
3624 | } | |
dec40cd2 DH |
3625 | x = SCM_CDR (x); |
3626 | *location = EVALCAR (x, env); | |
3627 | } | |
3628 | RETURN (SCM_UNSPECIFIED); | |
3f04400d DH |
3629 | |
3630 | ||
7e6e6b37 | 3631 | case (ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3632 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3633 | x = SCM_CDR (x); |
3634 | proc = EVALCAR (x, env); | |
3635 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3636 | |
3637 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3638 | x = SCM_CDR (x); |
3639 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3640 | |
3641 | apply_proc: | |
3642 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3643 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3644 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3645 | if (SCM_CLOSUREP (proc)) |
3646 | { | |
9a069bdd | 3647 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3648 | #ifdef DEVAL |
9a069bdd | 3649 | debug.info->a.args = arg1; |
6dbd0af5 | 3650 | #endif |
9a069bdd DH |
3651 | if (scm_badargsp (formals, arg1)) |
3652 | scm_wrong_num_args (proc); | |
3653 | ENTER_APPLY; | |
3654 | /* Copy argument list */ | |
3655 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3656 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3657 | else | |
3658 | { | |
3659 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3660 | SCM tail = args; | |
3661 | arg1 = SCM_CDR (arg1); | |
3662 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3663 | { | |
3664 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3665 | SCM_SETCDR (tail, new_tail); | |
3666 | tail = new_tail; | |
3667 | arg1 = SCM_CDR (arg1); | |
3668 | } | |
3669 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3670 | } | |
3671 | ||
3672 | x = SCM_CLOSURE_BODY (proc); | |
3673 | goto nontoplevel_begin; | |
0f2d19dd | 3674 | } |
3f04400d DH |
3675 | else |
3676 | { | |
e910e9d2 DH |
3677 | ENTER_APPLY; |
3678 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3679 | } |
3680 | ||
0f2d19dd | 3681 | |
7e6e6b37 | 3682 | case (ISYMNUM (SCM_IM_CONT)): |
5f144b10 GH |
3683 | { |
3684 | int first; | |
3685 | SCM val = scm_make_continuation (&first); | |
3686 | ||
e050d4f8 | 3687 | if (!first) |
5f144b10 | 3688 | RETURN (val); |
e050d4f8 DH |
3689 | else |
3690 | { | |
3691 | arg1 = val; | |
3692 | proc = SCM_CDR (x); | |
6bff1368 | 3693 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3694 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3695 | ENTER_APPLY; | |
e050d4f8 DH |
3696 | goto evap1; |
3697 | } | |
5f144b10 | 3698 | } |
e050d4f8 | 3699 | |
0f2d19dd | 3700 | |
7e6e6b37 | 3701 | case (ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3702 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3703 | |
e050d4f8 | 3704 | |
7e6e6b37 | 3705 | case (ISYMNUM (SCM_IM_FUTURE)): |
28d52ebb MD |
3706 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); |
3707 | ||
3708 | ||
7e6e6b37 DH |
3709 | /* PLACEHOLDER for case (ISYMNUM (SCM_IM_DISPATCH)): The following |
3710 | code (type_dispatch) is intended to be the tail of the case | |
3711 | clause for the internal macro SCM_IM_DISPATCH. Please don't | |
3712 | remove it from this location without discussing it with Mikael | |
c8e1d354 MD |
3713 | <djurfeldt@nada.kth.se> */ |
3714 | ||
f12745b6 DH |
3715 | /* The type dispatch code is duplicated below |
3716 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3717 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3718 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3719 | /* Type dispatch means to determine from the types of the function |
3720 | * arguments (i. e. the 'signature' of the call), which method from | |
3721 | * a generic function is to be called. This process of selecting | |
3722 | * the right method takes some time. To speed it up, guile uses | |
3723 | * caching: Together with the macro call to dispatch the signatures | |
3724 | * of some previous calls to that generic function from the same | |
3725 | * place are stored (in the code!) in a cache that we call the | |
3726 | * 'method cache'. This is done since it is likely, that | |
3727 | * consecutive calls to dispatch from that position in the code will | |
3728 | * have the same signature. Thus, the type dispatch works as | |
3729 | * follows: First, determine a hash value from the signature of the | |
3730 | * actual arguments. Second, use this hash value as an index to | |
3731 | * find that same signature in the method cache stored at this | |
3732 | * position in the code. If found, you have also found the | |
3733 | * corresponding method that belongs to that signature. If the | |
3734 | * signature is not found in the method cache, you have to perform a | |
3735 | * full search over all signatures stored with the generic | |
3736 | * function. */ | |
3737 | { | |
3738 | unsigned long int specializers; | |
3739 | unsigned long int hash_value; | |
3740 | unsigned long int cache_end_pos; | |
3741 | unsigned long int mask; | |
3742 | SCM method_cache; | |
3743 | ||
3744 | { | |
3745 | SCM z = SCM_CDDR (x); | |
3746 | SCM tmp = SCM_CADR (z); | |
e11e83f3 | 3747 | specializers = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3748 | |
3749 | /* Compute a hash value for searching the method cache. There | |
3750 | * are two variants for computing the hash value, a (rather) | |
3751 | * complicated one, and a simple one. For the complicated one | |
3752 | * explained below, tmp holds a number that is used in the | |
3753 | * computation. */ | |
4057a3e0 | 3754 | if (scm_is_simple_vector (tmp)) |
e11e83f3 MV |
3755 | { |
3756 | /* This method of determining the hash value is much | |
3757 | * simpler: Set the hash value to zero and just perform a | |
3758 | * linear search through the method cache. */ | |
3759 | method_cache = tmp; | |
3760 | mask = (unsigned long int) ((long) -1); | |
3761 | hash_value = 0; | |
4057a3e0 | 3762 | cache_end_pos = SCM_SIMPLE_VECTOR_LENGTH (method_cache); |
e11e83f3 MV |
3763 | } |
3764 | else | |
f12745b6 DH |
3765 | { |
3766 | /* Use the signature of the actual arguments to determine | |
3767 | * the hash value. This is done as follows: Each class has | |
3768 | * an array of random numbers, that are determined when the | |
3769 | * class is created. The integer 'hashset' is an index into | |
3770 | * that array of random numbers. Now, from all classes that | |
3771 | * are part of the signature of the actual arguments, the | |
3772 | * random numbers at index 'hashset' are taken and summed | |
3773 | * up, giving the hash value. The value of 'hashset' is | |
3774 | * stored at the call to dispatch. This allows to have | |
3775 | * different 'formulas' for calculating the hash value at | |
3776 | * different places where dispatch is called. This allows | |
3777 | * to optimize the hash formula at every individual place | |
3778 | * where dispatch is called, such that hopefully the hash | |
3779 | * value that is computed will directly point to the right | |
3780 | * method in the method cache. */ | |
e11e83f3 | 3781 | unsigned long int hashset = scm_to_ulong (tmp); |
f12745b6 | 3782 | unsigned long int counter = specializers + 1; |
dff98306 | 3783 | SCM tmp_arg = arg1; |
f12745b6 | 3784 | hash_value = 0; |
a61f4e0c | 3785 | while (!scm_is_null (tmp_arg) && counter != 0) |
61364ba6 | 3786 | { |
f12745b6 DH |
3787 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3788 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3789 | tmp_arg = SCM_CDR (tmp_arg); | |
3790 | counter--; | |
61364ba6 | 3791 | } |
f12745b6 DH |
3792 | z = SCM_CDDR (z); |
3793 | method_cache = SCM_CADR (z); | |
e11e83f3 | 3794 | mask = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3795 | hash_value &= mask; |
3796 | cache_end_pos = hash_value; | |
3797 | } | |
f12745b6 | 3798 | } |
61364ba6 | 3799 | |
f12745b6 DH |
3800 | { |
3801 | /* Search the method cache for a method with a matching | |
3802 | * signature. Start the search at position 'hash_value'. The | |
3803 | * hashing implementation uses linear probing for conflict | |
3804 | * resolution, that is, if the signature in question is not | |
3805 | * found at the starting index in the hash table, the next table | |
3806 | * entry is tried, and so on, until in the worst case the whole | |
3807 | * cache has been searched, but still the signature has not been | |
3808 | * found. */ | |
3809 | SCM z; | |
3810 | do | |
3811 | { | |
dff98306 | 3812 | SCM args = arg1; /* list of arguments */ |
4057a3e0 | 3813 | z = SCM_SIMPLE_VECTOR_REF (method_cache, hash_value); |
a61f4e0c | 3814 | while (!scm_is_null (args)) |
61364ba6 MD |
3815 | { |
3816 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 | 3817 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
bc36d050 | 3818 | if (!scm_is_eq (class_of_arg, SCM_CAR (z))) |
61364ba6 | 3819 | goto next_method; |
f12745b6 | 3820 | args = SCM_CDR (args); |
61364ba6 MD |
3821 | z = SCM_CDR (z); |
3822 | } | |
f12745b6 | 3823 | /* Fewer arguments than specifiers => CAR != ENV */ |
a61f4e0c | 3824 | if (scm_is_null (SCM_CAR (z)) || scm_is_pair (SCM_CAR (z))) |
f12745b6 DH |
3825 | goto apply_cmethod; |
3826 | next_method: | |
3827 | hash_value = (hash_value + 1) & mask; | |
3828 | } while (hash_value != cache_end_pos); | |
3829 | ||
3830 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3831 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3832 | |
dff98306 | 3833 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3834 | { |
3835 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3836 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3837 | x = SCM_CMETHOD_BODY (z); |
3838 | goto nontoplevel_begin; | |
3839 | } | |
3840 | } | |
61364ba6 | 3841 | } |
73b64342 | 3842 | |
1d15ecd3 | 3843 | |
7e6e6b37 | 3844 | case (ISYMNUM (SCM_IM_SLOT_REF)): |
ca4be6ea | 3845 | x = SCM_CDR (x); |
1d15ecd3 DH |
3846 | { |
3847 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3848 | unsigned long int slot = SCM_I_INUM (SCM_CDR (x)); |
1d15ecd3 DH |
3849 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); |
3850 | } | |
3851 | ||
3852 | ||
7e6e6b37 | 3853 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): |
ca4be6ea | 3854 | x = SCM_CDR (x); |
1d15ecd3 DH |
3855 | { |
3856 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3857 | unsigned long int slot = SCM_I_INUM (SCM_CADR (x)); |
1d15ecd3 DH |
3858 | SCM value = EVALCAR (SCM_CDDR (x), env); |
3859 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3860 | RETURN (SCM_UNSPECIFIED); | |
3861 | } | |
3862 | ||
c96d76b8 | 3863 | |
22721140 | 3864 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3865 | |
7e6e6b37 | 3866 | case (ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3867 | { |
3868 | SCM test_form = SCM_CDR (x); | |
3869 | x = SCM_CDR (test_form); | |
3870 | while (!SCM_NULL_OR_NIL_P (x)) | |
3871 | { | |
3872 | SCM test_result = EVALCAR (test_form, env); | |
7888309b | 3873 | if (!(scm_is_false (test_result) |
1d15ecd3 DH |
3874 | || SCM_NULL_OR_NIL_P (test_result))) |
3875 | { | |
bc36d050 | 3876 | if (scm_is_eq (SCM_CAR (x), SCM_UNSPECIFIED)) |
1d15ecd3 DH |
3877 | RETURN (test_result); |
3878 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3879 | goto carloop; | |
3880 | } | |
3881 | else | |
3882 | { | |
3883 | test_form = SCM_CDR (x); | |
3884 | x = SCM_CDR (test_form); | |
3885 | } | |
3886 | } | |
3887 | x = test_form; | |
3888 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3889 | goto carloop; | |
3890 | } | |
73b64342 | 3891 | |
c96d76b8 | 3892 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 | 3893 | |
7e6e6b37 | 3894 | case (ISYMNUM (SCM_IM_BIND)): |
2e171178 MV |
3895 | { |
3896 | SCM vars, exps, vals; | |
73b64342 | 3897 | |
2e171178 MV |
3898 | x = SCM_CDR (x); |
3899 | vars = SCM_CAAR (x); | |
3900 | exps = SCM_CDAR (x); | |
2e171178 | 3901 | vals = SCM_EOL; |
a61f4e0c | 3902 | while (!scm_is_null (exps)) |
2e171178 MV |
3903 | { |
3904 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3905 | exps = SCM_CDR (exps); | |
3906 | } | |
3907 | ||
3908 | scm_swap_bindings (vars, vals); | |
9de87eea | 3909 | scm_i_set_dynwinds (scm_acons (vars, vals, scm_i_dynwinds ())); |
1d15ecd3 DH |
3910 | |
3911 | /* Ignore all but the last evaluation result. */ | |
a61f4e0c | 3912 | for (x = SCM_CDR (x); !scm_is_null (SCM_CDR (x)); x = SCM_CDR (x)) |
2e171178 | 3913 | { |
a61f4e0c | 3914 | if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 3915 | CEVAL (SCM_CAR (x), env); |
2e171178 MV |
3916 | } |
3917 | proc = EVALCAR (x, env); | |
73b64342 | 3918 | |
9de87eea | 3919 | scm_i_set_dynwinds (SCM_CDR (scm_i_dynwinds ())); |
2e171178 | 3920 | scm_swap_bindings (vars, vals); |
73b64342 | 3921 | |
ddea3325 | 3922 | RETURN (proc); |
2e171178 | 3923 | } |
c96d76b8 | 3924 | |
1d15ecd3 | 3925 | |
7e6e6b37 | 3926 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 3927 | { |
9a069bdd DH |
3928 | SCM producer; |
3929 | ||
3930 | x = SCM_CDR (x); | |
3931 | producer = EVALCAR (x, env); | |
3932 | x = SCM_CDR (x); | |
3933 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3934 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3935 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3936 | { |
3937 | /* The list of arguments is not copied. Rather, it is assumed | |
3938 | * that this has been done by the 'values' procedure. */ | |
3939 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3940 | } | |
a513ead3 | 3941 | else |
82b3e2c6 DH |
3942 | { |
3943 | arg1 = scm_list_1 (arg1); | |
3944 | } | |
9a069bdd DH |
3945 | PREP_APPLY (proc, arg1); |
3946 | goto apply_proc; | |
a513ead3 MV |
3947 | } |
3948 | ||
b7798e10 | 3949 | |
0f2d19dd | 3950 | default: |
dec40cd2 | 3951 | break; |
0f2d19dd | 3952 | } |
dec40cd2 DH |
3953 | } |
3954 | else | |
3955 | { | |
434f2f7a DH |
3956 | if (SCM_VARIABLEP (SCM_CAR (x))) |
3957 | proc = SCM_VARIABLE_REF (SCM_CAR (x)); | |
f9986767 DH |
3958 | else if (SCM_ILOCP (SCM_CAR (x))) |
3959 | proc = *scm_ilookup (SCM_CAR (x), env); | |
a61f4e0c | 3960 | else if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 3961 | proc = CEVAL (SCM_CAR (x), env); |
cc95e00a | 3962 | else if (scm_is_symbol (SCM_CAR (x))) |
0f2d19dd | 3963 | { |
e050d4f8 | 3964 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3965 | { |
3966 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3967 | if (location == NULL) | |
3968 | { | |
3969 | /* we have lost the race, start again. */ | |
3970 | goto dispatch; | |
3971 | } | |
3972 | proc = *location; | |
3973 | } | |
f8769b1d | 3974 | |
22a52da1 | 3975 | if (SCM_MACROP (proc)) |
0f2d19dd | 3976 | { |
86d31dfe MV |
3977 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3978 | lookupcar */ | |
e050d4f8 | 3979 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3980 | #ifdef DEVAL |
7c354052 MD |
3981 | /* Set a flag during macro expansion so that macro |
3982 | application frames can be deleted from the backtrace. */ | |
3983 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3984 | #endif |
dff98306 | 3985 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 3986 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
3987 | #ifdef DEVAL |
3988 | SCM_CLEAR_MACROEXP (debug); | |
3989 | #endif | |
22a52da1 | 3990 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3991 | { |
3b88ed2a | 3992 | case 3: |
0f2d19dd | 3993 | case 2: |
a61f4e0c | 3994 | if (!scm_is_pair (arg1)) |
dff98306 | 3995 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); |
e7313a9d | 3996 | |
bc36d050 MV |
3997 | assert (!scm_is_eq (x, SCM_CAR (arg1)) |
3998 | && !scm_is_eq (x, SCM_CDR (arg1))); | |
e7313a9d | 3999 | |
6dbd0af5 | 4000 | #ifdef DEVAL |
22a52da1 | 4001 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 4002 | { |
9de87eea | 4003 | SCM_CRITICAL_SECTION_START; |
dff98306 DH |
4004 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4005 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
9de87eea | 4006 | SCM_CRITICAL_SECTION_END; |
6dbd0af5 MD |
4007 | goto dispatch; |
4008 | } | |
4009 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
4010 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
4011 | SCM_CAR (x), | |
4012 | SCM_CDR (x)); | |
6dbd0af5 | 4013 | #endif |
9de87eea | 4014 | SCM_CRITICAL_SECTION_START; |
dff98306 DH |
4015 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4016 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
9de87eea | 4017 | SCM_CRITICAL_SECTION_END; |
680516ba DH |
4018 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
4019 | goto loop; | |
3063e30a | 4020 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 4021 | case 1: |
680516ba DH |
4022 | x = arg1; |
4023 | if (SCM_NIMP (x)) | |
4024 | { | |
4025 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
4026 | goto loop; | |
4027 | } | |
4028 | else | |
4029 | RETURN (arg1); | |
3063e30a | 4030 | #endif |
0f2d19dd | 4031 | case 0: |
dff98306 | 4032 | RETURN (arg1); |
0f2d19dd JB |
4033 | } |
4034 | } | |
4035 | } | |
4036 | else | |
434f2f7a | 4037 | proc = SCM_CAR (x); |
bd987b8e | 4038 | |
ddd8f927 | 4039 | if (SCM_MACROP (proc)) |
0f2d19dd | 4040 | goto handle_a_macro; |
0f2d19dd JB |
4041 | } |
4042 | ||
4043 | ||
dec40cd2 DH |
4044 | /* When reaching this part of the code, the following is granted: Variable x |
4045 | * holds the first pair of an expression of the form (<function> arg ...). | |
4046 | * Variable proc holds the object that resulted from the evaluation of | |
4047 | * <function>. In the following, the arguments (if any) will be evaluated, | |
4048 | * and proc will be applied to them. If proc does not really hold a | |
4049 | * function object, this will be signalled as an error on the scheme | |
4050 | * level. If the number of arguments does not match the number of arguments | |
4051 | * that are allowed to be passed to proc, also an error on the scheme level | |
4052 | * will be signalled. */ | |
6dbd0af5 | 4053 | PREP_APPLY (proc, SCM_EOL); |
a61f4e0c | 4054 | if (scm_is_null (SCM_CDR (x))) { |
6dbd0af5 | 4055 | ENTER_APPLY; |
89efbff4 | 4056 | evap0: |
ddd8f927 | 4057 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
4058 | switch (SCM_TYP7 (proc)) |
4059 | { /* no arguments given */ | |
4060 | case scm_tc7_subr_0: | |
4061 | RETURN (SCM_SUBRF (proc) ()); | |
4062 | case scm_tc7_subr_1o: | |
4063 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
4064 | case scm_tc7_lsubr: | |
4065 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
4066 | case scm_tc7_rpsubr: | |
4067 | RETURN (SCM_BOOL_T); | |
4068 | case scm_tc7_asubr: | |
4069 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 4070 | case scm_tc7_smob: |
68b06924 | 4071 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4072 | goto badfun; |
68b06924 | 4073 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 4074 | case scm_tc7_cclo: |
dff98306 | 4075 | arg1 = proc; |
0f2d19dd | 4076 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
4077 | #ifdef DEVAL |
4078 | debug.info->a.proc = proc; | |
dff98306 | 4079 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4080 | #endif |
0f2d19dd | 4081 | goto evap1; |
89efbff4 MD |
4082 | case scm_tc7_pws: |
4083 | proc = SCM_PROCEDURE (proc); | |
4084 | #ifdef DEVAL | |
4085 | debug.info->a.proc = proc; | |
4086 | #endif | |
002f1a5d MD |
4087 | if (!SCM_CLOSUREP (proc)) |
4088 | goto evap0; | |
ddd8f927 | 4089 | /* fallthrough */ |
0f2d19dd | 4090 | case scm_tcs_closures: |
ddd8f927 DH |
4091 | { |
4092 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 4093 | if (scm_is_pair (formals)) |
212e58ed | 4094 | goto wrongnumargs; |
ddd8f927 DH |
4095 | x = SCM_CLOSURE_BODY (proc); |
4096 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
4097 | goto nontoplevel_begin; | |
4098 | } | |
904a077d | 4099 | case scm_tcs_struct: |
195847fa MD |
4100 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4101 | { | |
4102 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 4103 | arg1 = SCM_EOL; |
195847fa MD |
4104 | goto type_dispatch; |
4105 | } | |
2ca0d207 | 4106 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4107 | { |
dff98306 | 4108 | arg1 = proc; |
195847fa MD |
4109 | proc = (SCM_I_ENTITYP (proc) |
4110 | ? SCM_ENTITY_PROCEDURE (proc) | |
4111 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 4112 | #ifdef DEVAL |
195847fa | 4113 | debug.info->a.proc = proc; |
dff98306 | 4114 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 4115 | #endif |
ddd8f927 | 4116 | goto evap1; |
da7f71d7 | 4117 | } |
2ca0d207 DH |
4118 | else |
4119 | goto badfun; | |
0f2d19dd JB |
4120 | case scm_tc7_subr_1: |
4121 | case scm_tc7_subr_2: | |
4122 | case scm_tc7_subr_2o: | |
14b18ed6 | 4123 | case scm_tc7_dsubr: |
0f2d19dd JB |
4124 | case scm_tc7_cxr: |
4125 | case scm_tc7_subr_3: | |
4126 | case scm_tc7_lsubr_2: | |
212e58ed | 4127 | wrongnumargs: |
f5bf2977 | 4128 | scm_wrong_num_args (proc); |
0f2d19dd | 4129 | default: |
ddd8f927 DH |
4130 | badfun: |
4131 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 4132 | } |
6dbd0af5 | 4133 | } |
0f2d19dd JB |
4134 | |
4135 | /* must handle macros by here */ | |
4136 | x = SCM_CDR (x); | |
a61f4e0c | 4137 | if (scm_is_pair (x)) |
dff98306 | 4138 | arg1 = EVALCAR (x, env); |
680ed4a8 | 4139 | else |
ab1f1094 | 4140 | scm_wrong_num_args (proc); |
6dbd0af5 | 4141 | #ifdef DEVAL |
dff98306 | 4142 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4143 | #endif |
0f2d19dd | 4144 | x = SCM_CDR (x); |
42030fb2 DH |
4145 | { |
4146 | SCM arg2; | |
a61f4e0c | 4147 | if (scm_is_null (x)) |
42030fb2 DH |
4148 | { |
4149 | ENTER_APPLY; | |
4150 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 4151 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4152 | switch (SCM_TYP7 (proc)) |
4153 | { /* have one argument in arg1 */ | |
4154 | case scm_tc7_subr_2o: | |
4155 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4156 | case scm_tc7_subr_1: | |
4157 | case scm_tc7_subr_1o: | |
4158 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4159 | case scm_tc7_dsubr: |
e11e83f3 | 4160 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4161 | { |
d9a67fc4 | 4162 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4163 | } |
4164 | else if (SCM_REALP (arg1)) | |
4165 | { | |
d9a67fc4 | 4166 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4167 | } |
4168 | else if (SCM_BIGP (arg1)) | |
4169 | { | |
d9a67fc4 | 4170 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
14b18ed6 | 4171 | } |
f92e85f7 MV |
4172 | else if (SCM_FRACTIONP (arg1)) |
4173 | { | |
d9a67fc4 | 4174 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 MV |
4175 | } |
4176 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
cc95e00a MV |
4177 | SCM_ARG1, |
4178 | scm_i_symbol_chars (SCM_SNAME (proc))); | |
42030fb2 | 4179 | case scm_tc7_cxr: |
a61f4e0c | 4180 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
42030fb2 DH |
4181 | case scm_tc7_rpsubr: |
4182 | RETURN (SCM_BOOL_T); | |
4183 | case scm_tc7_asubr: | |
4184 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4185 | case scm_tc7_lsubr: | |
0f2d19dd | 4186 | #ifdef DEVAL |
42030fb2 | 4187 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 4188 | #else |
42030fb2 | 4189 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 4190 | #endif |
42030fb2 DH |
4191 | case scm_tc7_smob: |
4192 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4193 | goto badfun; | |
4194 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
4195 | case scm_tc7_cclo: | |
4196 | arg2 = arg1; | |
4197 | arg1 = proc; | |
4198 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4199 | #ifdef DEVAL |
42030fb2 DH |
4200 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4201 | debug.info->a.proc = proc; | |
6dbd0af5 | 4202 | #endif |
42030fb2 DH |
4203 | goto evap2; |
4204 | case scm_tc7_pws: | |
4205 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 4206 | #ifdef DEVAL |
42030fb2 | 4207 | debug.info->a.proc = proc; |
89efbff4 | 4208 | #endif |
42030fb2 DH |
4209 | if (!SCM_CLOSUREP (proc)) |
4210 | goto evap1; | |
ddd8f927 | 4211 | /* fallthrough */ |
42030fb2 | 4212 | case scm_tcs_closures: |
ddd8f927 DH |
4213 | { |
4214 | /* clos1: */ | |
4215 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4216 | if (scm_is_null (formals) |
4217 | || (scm_is_pair (formals) && scm_is_pair (SCM_CDR (formals)))) | |
212e58ed | 4218 | goto wrongnumargs; |
ddd8f927 | 4219 | x = SCM_CLOSURE_BODY (proc); |
0f2d19dd | 4220 | #ifdef DEVAL |
ddd8f927 DH |
4221 | env = SCM_EXTEND_ENV (formals, |
4222 | debug.info->a.args, | |
4223 | SCM_ENV (proc)); | |
0f2d19dd | 4224 | #else |
ddd8f927 DH |
4225 | env = SCM_EXTEND_ENV (formals, |
4226 | scm_list_1 (arg1), | |
4227 | SCM_ENV (proc)); | |
0f2d19dd | 4228 | #endif |
ddd8f927 DH |
4229 | goto nontoplevel_begin; |
4230 | } | |
42030fb2 DH |
4231 | case scm_tcs_struct: |
4232 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4233 | { | |
4234 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 4235 | #ifdef DEVAL |
42030fb2 | 4236 | arg1 = debug.info->a.args; |
f3d2630a | 4237 | #else |
42030fb2 | 4238 | arg1 = scm_list_1 (arg1); |
f3d2630a | 4239 | #endif |
42030fb2 DH |
4240 | goto type_dispatch; |
4241 | } | |
2ca0d207 | 4242 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4243 | { |
4244 | arg2 = arg1; | |
4245 | arg1 = proc; | |
4246 | proc = (SCM_I_ENTITYP (proc) | |
4247 | ? SCM_ENTITY_PROCEDURE (proc) | |
4248 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 4249 | #ifdef DEVAL |
42030fb2 DH |
4250 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4251 | debug.info->a.proc = proc; | |
0c32d76c | 4252 | #endif |
ddd8f927 | 4253 | goto evap2; |
42030fb2 | 4254 | } |
2ca0d207 DH |
4255 | else |
4256 | goto badfun; | |
42030fb2 DH |
4257 | case scm_tc7_subr_2: |
4258 | case scm_tc7_subr_0: | |
4259 | case scm_tc7_subr_3: | |
4260 | case scm_tc7_lsubr_2: | |
ab1f1094 | 4261 | scm_wrong_num_args (proc); |
42030fb2 DH |
4262 | default: |
4263 | goto badfun; | |
4264 | } | |
4265 | } | |
a61f4e0c | 4266 | if (scm_is_pair (x)) |
42030fb2 DH |
4267 | arg2 = EVALCAR (x, env); |
4268 | else | |
ab1f1094 | 4269 | scm_wrong_num_args (proc); |
bd987b8e | 4270 | |
42030fb2 | 4271 | { /* have two or more arguments */ |
6dbd0af5 | 4272 | #ifdef DEVAL |
42030fb2 | 4273 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 4274 | #endif |
42030fb2 | 4275 | x = SCM_CDR (x); |
a61f4e0c | 4276 | if (scm_is_null (x)) { |
42030fb2 DH |
4277 | ENTER_APPLY; |
4278 | evap2: | |
ddd8f927 | 4279 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4280 | switch (SCM_TYP7 (proc)) |
4281 | { /* have two arguments */ | |
4282 | case scm_tc7_subr_2: | |
4283 | case scm_tc7_subr_2o: | |
4284 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4285 | case scm_tc7_lsubr: | |
0f2d19dd | 4286 | #ifdef DEVAL |
42030fb2 | 4287 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 4288 | #else |
42030fb2 DH |
4289 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
4290 | #endif | |
4291 | case scm_tc7_lsubr_2: | |
4292 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
4293 | case scm_tc7_rpsubr: | |
4294 | case scm_tc7_asubr: | |
4295 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4296 | case scm_tc7_smob: | |
4297 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4298 | goto badfun; | |
4299 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
4300 | cclon: | |
4301 | case scm_tc7_cclo: | |
0f2d19dd | 4302 | #ifdef DEVAL |
42030fb2 DH |
4303 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4304 | scm_cons (proc, debug.info->a.args), | |
4305 | SCM_EOL)); | |
0f2d19dd | 4306 | #else |
42030fb2 DH |
4307 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4308 | scm_cons2 (proc, arg1, | |
4309 | scm_cons (arg2, | |
4310 | scm_eval_args (x, | |
4311 | env, | |
4312 | proc))), | |
4313 | SCM_EOL)); | |
4314 | #endif | |
4315 | case scm_tcs_struct: | |
4316 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4317 | { | |
4318 | x = SCM_ENTITY_PROCEDURE (proc); | |
4319 | #ifdef DEVAL | |
4320 | arg1 = debug.info->a.args; | |
4321 | #else | |
4322 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 4323 | #endif |
42030fb2 DH |
4324 | goto type_dispatch; |
4325 | } | |
2ca0d207 | 4326 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4327 | { |
4328 | operatorn: | |
f3d2630a | 4329 | #ifdef DEVAL |
42030fb2 DH |
4330 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4331 | ? SCM_ENTITY_PROCEDURE (proc) | |
4332 | : SCM_OPERATOR_PROCEDURE (proc), | |
4333 | scm_cons (proc, debug.info->a.args), | |
4334 | SCM_EOL)); | |
f3d2630a | 4335 | #else |
42030fb2 DH |
4336 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4337 | ? SCM_ENTITY_PROCEDURE (proc) | |
4338 | : SCM_OPERATOR_PROCEDURE (proc), | |
4339 | scm_cons2 (proc, arg1, | |
4340 | scm_cons (arg2, | |
4341 | scm_eval_args (x, | |
4342 | env, | |
4343 | proc))), | |
4344 | SCM_EOL)); | |
f3d2630a | 4345 | #endif |
42030fb2 | 4346 | } |
2ca0d207 DH |
4347 | else |
4348 | goto badfun; | |
42030fb2 | 4349 | case scm_tc7_subr_0: |
14b18ed6 | 4350 | case scm_tc7_dsubr: |
42030fb2 DH |
4351 | case scm_tc7_cxr: |
4352 | case scm_tc7_subr_1o: | |
4353 | case scm_tc7_subr_1: | |
4354 | case scm_tc7_subr_3: | |
ab1f1094 | 4355 | scm_wrong_num_args (proc); |
42030fb2 | 4356 | default: |
9b07e212 | 4357 | goto badfun; |
42030fb2 DH |
4358 | case scm_tc7_pws: |
4359 | proc = SCM_PROCEDURE (proc); | |
4360 | #ifdef DEVAL | |
4361 | debug.info->a.proc = proc; | |
4362 | #endif | |
4363 | if (!SCM_CLOSUREP (proc)) | |
4364 | goto evap2; | |
ddd8f927 | 4365 | /* fallthrough */ |
42030fb2 | 4366 | case scm_tcs_closures: |
ddd8f927 DH |
4367 | { |
4368 | /* clos2: */ | |
4369 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4370 | if (scm_is_null (formals) |
4371 | || (scm_is_pair (formals) | |
4372 | && (scm_is_null (SCM_CDR (formals)) | |
4373 | || (scm_is_pair (SCM_CDR (formals)) | |
4374 | && scm_is_pair (SCM_CDDR (formals)))))) | |
212e58ed | 4375 | goto wrongnumargs; |
0c32d76c | 4376 | #ifdef DEVAL |
ddd8f927 DH |
4377 | env = SCM_EXTEND_ENV (formals, |
4378 | debug.info->a.args, | |
4379 | SCM_ENV (proc)); | |
195847fa | 4380 | #else |
ddd8f927 DH |
4381 | env = SCM_EXTEND_ENV (formals, |
4382 | scm_list_2 (arg1, arg2), | |
4383 | SCM_ENV (proc)); | |
195847fa | 4384 | #endif |
ddd8f927 DH |
4385 | x = SCM_CLOSURE_BODY (proc); |
4386 | goto nontoplevel_begin; | |
4387 | } | |
42030fb2 DH |
4388 | } |
4389 | } | |
a61f4e0c | 4390 | if (!scm_is_pair (x)) |
ab1f1094 | 4391 | scm_wrong_num_args (proc); |
42030fb2 DH |
4392 | #ifdef DEVAL |
4393 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4394 | deval_args (x, env, proc, | |
4395 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4396 | #endif | |
4397 | ENTER_APPLY; | |
4398 | evap3: | |
ddd8f927 | 4399 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4400 | switch (SCM_TYP7 (proc)) |
4401 | { /* have 3 or more arguments */ | |
4402 | #ifdef DEVAL | |
6dbd0af5 | 4403 | case scm_tc7_subr_3: |
a61f4e0c | 4404 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4405 | scm_wrong_num_args (proc); |
4406 | else | |
4407 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4408 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4409 | case scm_tc7_asubr: |
4410 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4411 | arg2 = SCM_CDDR (debug.info->a.args); | |
4412 | do | |
4413 | { | |
4414 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4415 | arg2 = SCM_CDR (arg2); | |
4416 | } | |
4417 | while (SCM_NIMP (arg2)); | |
4418 | RETURN (arg1); | |
4419 | case scm_tc7_rpsubr: | |
7888309b | 4420 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4421 | RETURN (SCM_BOOL_F); |
4422 | arg1 = SCM_CDDR (debug.info->a.args); | |
4423 | do | |
4424 | { | |
7888309b | 4425 | if (scm_is_false (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) |
42030fb2 DH |
4426 | RETURN (SCM_BOOL_F); |
4427 | arg2 = SCM_CAR (arg1); | |
4428 | arg1 = SCM_CDR (arg1); | |
4429 | } | |
4430 | while (SCM_NIMP (arg1)); | |
4431 | RETURN (SCM_BOOL_T); | |
4432 | case scm_tc7_lsubr_2: | |
4433 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4434 | SCM_CDDR (debug.info->a.args))); | |
4435 | case scm_tc7_lsubr: | |
4436 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4437 | case scm_tc7_smob: | |
4438 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4439 | goto badfun; | |
4440 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4441 | SCM_CDDR (debug.info->a.args))); | |
4442 | case scm_tc7_cclo: | |
4443 | goto cclon; | |
002f1a5d MD |
4444 | case scm_tc7_pws: |
4445 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4446 | debug.info->a.proc = proc; |
002f1a5d | 4447 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4448 | goto evap3; |
ddd8f927 | 4449 | /* fallthrough */ |
6dbd0af5 | 4450 | case scm_tcs_closures: |
ddd8f927 DH |
4451 | { |
4452 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4453 | if (scm_is_null (formals) |
4454 | || (scm_is_pair (formals) | |
4455 | && (scm_is_null (SCM_CDR (formals)) | |
4456 | || (scm_is_pair (SCM_CDR (formals)) | |
ddd8f927 | 4457 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4458 | goto wrongnumargs; |
ddd8f927 DH |
4459 | SCM_SET_ARGSREADY (debug); |
4460 | env = SCM_EXTEND_ENV (formals, | |
4461 | debug.info->a.args, | |
4462 | SCM_ENV (proc)); | |
4463 | x = SCM_CLOSURE_BODY (proc); | |
4464 | goto nontoplevel_begin; | |
4465 | } | |
6dbd0af5 | 4466 | #else /* DEVAL */ |
42030fb2 | 4467 | case scm_tc7_subr_3: |
a61f4e0c | 4468 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4469 | scm_wrong_num_args (proc); |
4470 | else | |
4471 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4472 | case scm_tc7_asubr: |
4473 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4474 | do | |
4475 | { | |
4476 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4477 | x = SCM_CDR(x); | |
4478 | } | |
a61f4e0c | 4479 | while (!scm_is_null (x)); |
42030fb2 DH |
4480 | RETURN (arg1); |
4481 | case scm_tc7_rpsubr: | |
7888309b | 4482 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4483 | RETURN (SCM_BOOL_F); |
4484 | do | |
4485 | { | |
4486 | arg1 = EVALCAR (x, env); | |
7888309b | 4487 | if (scm_is_false (SCM_SUBRF (proc) (arg2, arg1))) |
42030fb2 DH |
4488 | RETURN (SCM_BOOL_F); |
4489 | arg2 = arg1; | |
4490 | x = SCM_CDR (x); | |
4491 | } | |
a61f4e0c | 4492 | while (!scm_is_null (x)); |
42030fb2 DH |
4493 | RETURN (SCM_BOOL_T); |
4494 | case scm_tc7_lsubr_2: | |
4495 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4496 | case scm_tc7_lsubr: | |
4497 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4498 | arg2, | |
4499 | scm_eval_args (x, env, proc)))); | |
4500 | case scm_tc7_smob: | |
4501 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4502 | goto badfun; | |
4503 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4504 | scm_eval_args (x, env, proc))); | |
4505 | case scm_tc7_cclo: | |
4506 | goto cclon; | |
4507 | case scm_tc7_pws: | |
4508 | proc = SCM_PROCEDURE (proc); | |
4509 | if (!SCM_CLOSUREP (proc)) | |
4510 | goto evap3; | |
ddd8f927 DH |
4511 | /* fallthrough */ |
4512 | case scm_tcs_closures: | |
da7f71d7 | 4513 | { |
ddd8f927 | 4514 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
a61f4e0c MV |
4515 | if (scm_is_null (formals) |
4516 | || (scm_is_pair (formals) | |
4517 | && (scm_is_null (SCM_CDR (formals)) | |
4518 | || (scm_is_pair (SCM_CDR (formals)) | |
42030fb2 | 4519 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4520 | goto wrongnumargs; |
ddd8f927 DH |
4521 | env = SCM_EXTEND_ENV (formals, |
4522 | scm_cons2 (arg1, | |
4523 | arg2, | |
4524 | scm_eval_args (x, env, proc)), | |
4525 | SCM_ENV (proc)); | |
4526 | x = SCM_CLOSURE_BODY (proc); | |
4527 | goto nontoplevel_begin; | |
da7f71d7 | 4528 | } |
0f2d19dd | 4529 | #endif /* DEVAL */ |
42030fb2 DH |
4530 | case scm_tcs_struct: |
4531 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4532 | { | |
f3d2630a | 4533 | #ifdef DEVAL |
42030fb2 | 4534 | arg1 = debug.info->a.args; |
f3d2630a | 4535 | #else |
42030fb2 | 4536 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4537 | #endif |
42030fb2 DH |
4538 | x = SCM_ENTITY_PROCEDURE (proc); |
4539 | goto type_dispatch; | |
4540 | } | |
2ca0d207 | 4541 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4542 | goto operatorn; |
2ca0d207 DH |
4543 | else |
4544 | goto badfun; | |
42030fb2 DH |
4545 | case scm_tc7_subr_2: |
4546 | case scm_tc7_subr_1o: | |
4547 | case scm_tc7_subr_2o: | |
4548 | case scm_tc7_subr_0: | |
14b18ed6 | 4549 | case scm_tc7_dsubr: |
42030fb2 DH |
4550 | case scm_tc7_cxr: |
4551 | case scm_tc7_subr_1: | |
ab1f1094 | 4552 | scm_wrong_num_args (proc); |
42030fb2 | 4553 | default: |
9b07e212 | 4554 | goto badfun; |
42030fb2 DH |
4555 | } |
4556 | } | |
0f2d19dd JB |
4557 | } |
4558 | #ifdef DEVAL | |
6dbd0af5 | 4559 | exit: |
5132eef0 | 4560 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4561 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4562 | { |
b7ff98dd MD |
4563 | SCM_CLEAR_TRACED_FRAME (debug); |
4564 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4565 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4566 | else |
4567 | { | |
5f144b10 GH |
4568 | int first; |
4569 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4570 | |
5f144b10 | 4571 | if (first) |
dff98306 | 4572 | arg1 = val; |
5f144b10 | 4573 | else |
6dbd0af5 | 4574 | { |
5f144b10 | 4575 | proc = val; |
6dbd0af5 MD |
4576 | goto ret; |
4577 | } | |
4578 | } | |
d95c0b76 | 4579 | SCM_TRAPS_P = 0; |
dff98306 | 4580 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4581 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4582 | } |
4583 | ret: | |
9de87eea | 4584 | scm_i_set_last_debug_frame (debug.prev); |
0f2d19dd JB |
4585 | return proc; |
4586 | #endif | |
4587 | } | |
4588 | ||
6dbd0af5 MD |
4589 | |
4590 | /* SECTION: This code is compiled once. | |
4591 | */ | |
4592 | ||
0f2d19dd JB |
4593 | #ifndef DEVAL |
4594 | ||
fdc28395 | 4595 | \f |
d0b07b5d | 4596 | |
fdc28395 KN |
4597 | /* Simple procedure calls |
4598 | */ | |
4599 | ||
4600 | SCM | |
4601 | scm_call_0 (SCM proc) | |
4602 | { | |
4603 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4604 | } | |
4605 | ||
4606 | SCM | |
4607 | scm_call_1 (SCM proc, SCM arg1) | |
4608 | { | |
4609 | return scm_apply (proc, arg1, scm_listofnull); | |
4610 | } | |
4611 | ||
4612 | SCM | |
4613 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4614 | { | |
4615 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4616 | } | |
4617 | ||
4618 | SCM | |
4619 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4620 | { | |
4621 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4622 | } | |
4623 | ||
d95c0b76 NJ |
4624 | SCM |
4625 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4626 | { | |
4627 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4628 | scm_cons (arg4, scm_listofnull))); | |
4629 | } | |
4630 | ||
fdc28395 KN |
4631 | /* Simple procedure applies |
4632 | */ | |
4633 | ||
4634 | SCM | |
4635 | scm_apply_0 (SCM proc, SCM args) | |
4636 | { | |
4637 | return scm_apply (proc, args, SCM_EOL); | |
4638 | } | |
4639 | ||
4640 | SCM | |
4641 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4642 | { | |
4643 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4644 | } | |
4645 | ||
4646 | SCM | |
4647 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4648 | { | |
4649 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4650 | } | |
4651 | ||
4652 | SCM | |
4653 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4654 | { | |
4655 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4656 | SCM_EOL); | |
4657 | } | |
4658 | ||
82a2622a | 4659 | /* This code processes the arguments to apply: |
b145c172 JB |
4660 | |
4661 | (apply PROC ARG1 ... ARGS) | |
4662 | ||
82a2622a JB |
4663 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4664 | ... arguments onto the front of ARGS, and returns the resulting | |
4665 | list. Note that ARGS is a list; thus, the argument to this | |
4666 | function is a list whose last element is a list. | |
4667 | ||
4668 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4669 | result. apply:nconc2last takes care of building the list of |
4670 | arguments, given (ARG1 ... ARGS). | |
4671 | ||
82a2622a JB |
4672 | Rather than do new consing, apply:nconc2last destroys its argument. |
4673 | On that topic, this code came into my care with the following | |
4674 | beautifully cryptic comment on that topic: "This will only screw | |
4675 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4676 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4677 | |
3b3b36dd | 4678 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4679 | (SCM lst), |
4680 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4681 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4682 | "@var{args}, and returns the resulting list. Note that\n" | |
4683 | "@var{args} is a list; thus, the argument to this function is\n" | |
4684 | "a list whose last element is a list.\n" | |
4685 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4686 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4687 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4688 | { |
4689 | SCM *lloc; | |
34d19ef6 | 4690 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4691 | lloc = &lst; |
a61f4e0c | 4692 | while (!scm_is_null (SCM_CDR (*lloc))) /* Perhaps should be |
c96d76b8 NJ |
4693 | SCM_NULL_OR_NIL_P, but not |
4694 | needed in 99.99% of cases, | |
4695 | and it could seriously hurt | |
4696 | performance. - Neil */ | |
a23afe53 | 4697 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4698 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4699 | *lloc = SCM_CAR (*lloc); |
4700 | return lst; | |
4701 | } | |
1bbd0b84 | 4702 | #undef FUNC_NAME |
0f2d19dd JB |
4703 | |
4704 | #endif /* !DEVAL */ | |
4705 | ||
6dbd0af5 MD |
4706 | |
4707 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4708 | * It is compiled twice. | |
4709 | */ | |
4710 | ||
0f2d19dd | 4711 | #if 0 |
0f2d19dd | 4712 | SCM |
6e8d25a6 | 4713 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4714 | {} |
4715 | #endif | |
4716 | ||
4717 | #if 0 | |
0f2d19dd | 4718 | SCM |
6e8d25a6 | 4719 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4720 | {} |
0f2d19dd JB |
4721 | #endif |
4722 | ||
1cc91f1b | 4723 | |
82a2622a JB |
4724 | /* Apply a function to a list of arguments. |
4725 | ||
4726 | This function is exported to the Scheme level as taking two | |
4727 | required arguments and a tail argument, as if it were: | |
4728 | (lambda (proc arg1 . args) ...) | |
4729 | Thus, if you just have a list of arguments to pass to a procedure, | |
4730 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4731 | args, pass the first as ARG1, then cons any remaining fixed args | |
4732 | onto the front of your argument list, and pass that as ARGS. */ | |
4733 | ||
0f2d19dd | 4734 | SCM |
1bbd0b84 | 4735 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4736 | { |
0f2d19dd | 4737 | #ifdef DEVAL |
92c2555f MV |
4738 | scm_t_debug_frame debug; |
4739 | scm_t_debug_info debug_vect_body; | |
9de87eea | 4740 | debug.prev = scm_i_last_debug_frame (); |
b7ff98dd | 4741 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4742 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4743 | debug.vect[0].a.proc = proc; |
4744 | debug.vect[0].a.args = SCM_EOL; | |
9de87eea | 4745 | scm_i_set_last_debug_frame (&debug); |
0f2d19dd | 4746 | #else |
434f2f7a | 4747 | if (scm_debug_mode_p) |
0f2d19dd | 4748 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4749 | #endif |
4750 | ||
4751 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4752 | |
4753 | /* If ARGS is the empty list, then we're calling apply with only two | |
4754 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4755 | the case, futz with things so that ARG1 is the first argument to | |
4756 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4757 | rest. |
4758 | ||
4759 | Setting the debug apply frame args this way is pretty messy. | |
4760 | Perhaps we should store arg1 and args directly in the frame as | |
4761 | received, and let scm_frame_arguments unpack them, because that's | |
4762 | a relatively rare operation. This works for now; if the Guile | |
4763 | developer archives are still around, see Mikael's post of | |
4764 | 11-Apr-97. */ | |
a61f4e0c | 4765 | if (scm_is_null (args)) |
0f2d19dd | 4766 | { |
a61f4e0c | 4767 | if (scm_is_null (arg1)) |
30000774 JB |
4768 | { |
4769 | arg1 = SCM_UNDEFINED; | |
4770 | #ifdef DEVAL | |
4771 | debug.vect[0].a.args = SCM_EOL; | |
4772 | #endif | |
4773 | } | |
0f2d19dd JB |
4774 | else |
4775 | { | |
30000774 JB |
4776 | #ifdef DEVAL |
4777 | debug.vect[0].a.args = arg1; | |
4778 | #endif | |
0f2d19dd JB |
4779 | args = SCM_CDR (arg1); |
4780 | arg1 = SCM_CAR (arg1); | |
4781 | } | |
4782 | } | |
4783 | else | |
4784 | { | |
0f2d19dd | 4785 | args = scm_nconc2last (args); |
30000774 JB |
4786 | #ifdef DEVAL |
4787 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4788 | #endif | |
0f2d19dd | 4789 | } |
0f2d19dd | 4790 | #ifdef DEVAL |
b6d75948 | 4791 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4792 | { |
4793 | SCM tmp; | |
b7ff98dd | 4794 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4795 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4796 | else |
4797 | { | |
5f144b10 GH |
4798 | int first; |
4799 | ||
4800 | tmp = scm_make_continuation (&first); | |
4801 | if (!first) | |
6dbd0af5 MD |
4802 | goto entap; |
4803 | } | |
d95c0b76 NJ |
4804 | SCM_TRAPS_P = 0; |
4805 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4806 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4807 | } |
4808 | entap: | |
4809 | ENTER_APPLY; | |
4810 | #endif | |
6dbd0af5 | 4811 | tail: |
0f2d19dd JB |
4812 | switch (SCM_TYP7 (proc)) |
4813 | { | |
4814 | case scm_tc7_subr_2o: | |
a61f4e0c | 4815 | args = scm_is_null (args) ? SCM_UNDEFINED : SCM_CAR (args); |
ddea3325 | 4816 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4817 | case scm_tc7_subr_2: |
a61f4e0c | 4818 | if (scm_is_null (args) || !scm_is_null (SCM_CDR (args))) |
ab1f1094 | 4819 | scm_wrong_num_args (proc); |
0f2d19dd | 4820 | args = SCM_CAR (args); |
ddea3325 | 4821 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4822 | case scm_tc7_subr_0: |
ab1f1094 DH |
4823 | if (!SCM_UNBNDP (arg1)) |
4824 | scm_wrong_num_args (proc); | |
4825 | else | |
4826 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4827 | case scm_tc7_subr_1: |
ab1f1094 DH |
4828 | if (SCM_UNBNDP (arg1)) |
4829 | scm_wrong_num_args (proc); | |
0f2d19dd | 4830 | case scm_tc7_subr_1o: |
a61f4e0c | 4831 | if (!scm_is_null (args)) |
ab1f1094 DH |
4832 | scm_wrong_num_args (proc); |
4833 | else | |
4834 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4835 | case scm_tc7_dsubr: |
a61f4e0c | 4836 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
14b18ed6 | 4837 | scm_wrong_num_args (proc); |
e11e83f3 | 4838 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4839 | { |
d9a67fc4 | 4840 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4841 | } |
4842 | else if (SCM_REALP (arg1)) | |
4843 | { | |
d9a67fc4 | 4844 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4845 | } |
4846 | else if (SCM_BIGP (arg1)) | |
f92e85f7 | 4847 | { |
d9a67fc4 | 4848 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
4849 | } |
4850 | else if (SCM_FRACTIONP (arg1)) | |
4851 | { | |
d9a67fc4 | 4852 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 4853 | } |
14b18ed6 | 4854 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 4855 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
0f2d19dd | 4856 | case scm_tc7_cxr: |
a61f4e0c | 4857 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
ab1f1094 | 4858 | scm_wrong_num_args (proc); |
a61f4e0c | 4859 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
0f2d19dd | 4860 | case scm_tc7_subr_3: |
a61f4e0c MV |
4861 | if (scm_is_null (args) |
4862 | || scm_is_null (SCM_CDR (args)) | |
4863 | || !scm_is_null (SCM_CDDR (args))) | |
ab1f1094 DH |
4864 | scm_wrong_num_args (proc); |
4865 | else | |
4866 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4867 | case scm_tc7_lsubr: |
4868 | #ifdef DEVAL | |
ddea3325 | 4869 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4870 | #else |
ddea3325 | 4871 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4872 | #endif |
4873 | case scm_tc7_lsubr_2: | |
a61f4e0c | 4874 | if (!scm_is_pair (args)) |
ab1f1094 DH |
4875 | scm_wrong_num_args (proc); |
4876 | else | |
4877 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd | 4878 | case scm_tc7_asubr: |
a61f4e0c | 4879 | if (scm_is_null (args)) |
ddea3325 | 4880 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4881 | while (SCM_NIMP (args)) |
4882 | { | |
a61f4e0c | 4883 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
0f2d19dd JB |
4884 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); |
4885 | args = SCM_CDR (args); | |
4886 | } | |
4887 | RETURN (arg1); | |
4888 | case scm_tc7_rpsubr: | |
a61f4e0c | 4889 | if (scm_is_null (args)) |
0f2d19dd JB |
4890 | RETURN (SCM_BOOL_T); |
4891 | while (SCM_NIMP (args)) | |
4892 | { | |
a61f4e0c | 4893 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
7888309b | 4894 | if (scm_is_false (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) |
0f2d19dd JB |
4895 | RETURN (SCM_BOOL_F); |
4896 | arg1 = SCM_CAR (args); | |
4897 | args = SCM_CDR (args); | |
4898 | } | |
4899 | RETURN (SCM_BOOL_T); | |
4900 | case scm_tcs_closures: | |
4901 | #ifdef DEVAL | |
6dbd0af5 | 4902 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4903 | #else |
4904 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4905 | #endif | |
726d810a | 4906 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4907 | scm_wrong_num_args (proc); |
1609038c MD |
4908 | |
4909 | /* Copy argument list */ | |
4910 | if (SCM_IMP (arg1)) | |
4911 | args = arg1; | |
4912 | else | |
4913 | { | |
4914 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
a61f4e0c | 4915 | for (arg1 = SCM_CDR (arg1); scm_is_pair (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4916 | { |
05b15362 | 4917 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4918 | tl = SCM_CDR (tl); |
4919 | } | |
4920 | SCM_SETCDR (tl, arg1); | |
4921 | } | |
4922 | ||
821f18a4 DH |
4923 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4924 | args, | |
4925 | SCM_ENV (proc)); | |
f9450cdb | 4926 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4927 | again: |
05b15362 | 4928 | arg1 = SCM_CDR (proc); |
a61f4e0c | 4929 | while (!scm_is_null (arg1)) |
2ddb0920 MD |
4930 | { |
4931 | if (SCM_IMP (SCM_CAR (proc))) | |
4932 | { | |
4933 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4934 | { | |
9de87eea | 4935 | scm_i_scm_pthread_mutex_lock (&source_mutex); |
9bc4701c MD |
4936 | /* check for race condition */ |
4937 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4938 | m_expand_body (proc, args); |
9de87eea | 4939 | scm_i_pthread_mutex_unlock (&source_mutex); |
e791c18f | 4940 | goto again; |
2ddb0920 | 4941 | } |
5280aaca | 4942 | else |
17fa3fcf | 4943 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4944 | } |
4945 | else | |
b1cb24ff | 4946 | (void) EVAL (SCM_CAR (proc), args); |
e791c18f | 4947 | proc = arg1; |
05b15362 | 4948 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4949 | } |
e791c18f | 4950 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4951 | case scm_tc7_smob: |
68b06924 | 4952 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4953 | goto badproc; |
afa38f6e | 4954 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4955 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
a61f4e0c | 4956 | else if (scm_is_null (args)) |
ddea3325 | 4957 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
a61f4e0c | 4958 | else if (scm_is_null (SCM_CDR (args))) |
ddea3325 | 4959 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4960 | else |
68b06924 | 4961 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4962 | case scm_tc7_cclo: |
4963 | #ifdef DEVAL | |
6dbd0af5 MD |
4964 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4965 | arg1 = proc; | |
4966 | proc = SCM_CCLO_SUBR (proc); | |
4967 | debug.vect[0].a.proc = proc; | |
4968 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4969 | #else |
4970 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4971 | arg1 = proc; |
4972 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4973 | #endif |
0f2d19dd | 4974 | goto tail; |
89efbff4 MD |
4975 | case scm_tc7_pws: |
4976 | proc = SCM_PROCEDURE (proc); | |
4977 | #ifdef DEVAL | |
4978 | debug.vect[0].a.proc = proc; | |
4979 | #endif | |
4980 | goto tail; | |
904a077d | 4981 | case scm_tcs_struct: |
f3d2630a MD |
4982 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4983 | { | |
4984 | #ifdef DEVAL | |
4985 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4986 | #else | |
4987 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4988 | #endif | |
195847fa | 4989 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4990 | } |
2ca0d207 | 4991 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4992 | { |
504d99c5 | 4993 | /* operator */ |
da7f71d7 MD |
4994 | #ifdef DEVAL |
4995 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4996 | #else | |
4997 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4998 | #endif | |
4999 | arg1 = proc; | |
195847fa MD |
5000 | proc = (SCM_I_ENTITYP (proc) |
5001 | ? SCM_ENTITY_PROCEDURE (proc) | |
5002 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
5003 | #ifdef DEVAL |
5004 | debug.vect[0].a.proc = proc; | |
5005 | debug.vect[0].a.args = scm_cons (arg1, args); | |
5006 | #endif | |
195847fa MD |
5007 | if (SCM_NIMP (proc)) |
5008 | goto tail; | |
5009 | else | |
5010 | goto badproc; | |
da7f71d7 | 5011 | } |
2ca0d207 DH |
5012 | else |
5013 | goto badproc; | |
0f2d19dd JB |
5014 | default: |
5015 | badproc: | |
db4b4ca6 | 5016 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
5017 | } |
5018 | #ifdef DEVAL | |
6dbd0af5 | 5019 | exit: |
5132eef0 | 5020 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 5021 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 5022 | { |
b7ff98dd MD |
5023 | SCM_CLEAR_TRACED_FRAME (debug); |
5024 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 5025 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
5026 | else |
5027 | { | |
5f144b10 GH |
5028 | int first; |
5029 | SCM val = scm_make_continuation (&first); | |
5030 | ||
5031 | if (first) | |
5032 | arg1 = val; | |
5033 | else | |
6dbd0af5 | 5034 | { |
5f144b10 | 5035 | proc = val; |
6dbd0af5 MD |
5036 | goto ret; |
5037 | } | |
5038 | } | |
d95c0b76 NJ |
5039 | SCM_TRAPS_P = 0; |
5040 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
5041 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
5042 | } |
5043 | ret: | |
9de87eea | 5044 | scm_i_set_last_debug_frame (debug.prev); |
0f2d19dd JB |
5045 | return proc; |
5046 | #endif | |
5047 | } | |
5048 | ||
6dbd0af5 MD |
5049 | |
5050 | /* SECTION: The rest of this file is only read once. | |
5051 | */ | |
5052 | ||
0f2d19dd JB |
5053 | #ifndef DEVAL |
5054 | ||
504d99c5 MD |
5055 | /* Trampolines |
5056 | * | |
5057 | * Trampolines make it possible to move procedure application dispatch | |
5058 | * outside inner loops. The motivation was clean implementation of | |
5059 | * efficient replacements of R5RS primitives in SRFI-1. | |
5060 | * | |
5061 | * The semantics is clear: scm_trampoline_N returns an optimized | |
5062 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
5063 | * on N args). | |
5064 | * | |
5065 | * Applying the optimization to map and for-each increased efficiency | |
5066 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
5067 | * before. | |
5068 | */ | |
5069 | ||
756414cf MD |
5070 | static SCM |
5071 | call_subr0_0 (SCM proc) | |
5072 | { | |
5073 | return SCM_SUBRF (proc) (); | |
5074 | } | |
5075 | ||
5076 | static SCM | |
5077 | call_subr1o_0 (SCM proc) | |
5078 | { | |
5079 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
5080 | } | |
5081 | ||
5082 | static SCM | |
5083 | call_lsubr_0 (SCM proc) | |
5084 | { | |
5085 | return SCM_SUBRF (proc) (SCM_EOL); | |
5086 | } | |
5087 | ||
5088 | SCM | |
5089 | scm_i_call_closure_0 (SCM proc) | |
5090 | { | |
6a3f13f0 DH |
5091 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5092 | SCM_EOL, | |
5093 | SCM_ENV (proc)); | |
5094 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5095 | return result; |
756414cf MD |
5096 | } |
5097 | ||
5098 | scm_t_trampoline_0 | |
5099 | scm_trampoline_0 (SCM proc) | |
5100 | { | |
2510c810 DH |
5101 | scm_t_trampoline_0 trampoline; |
5102 | ||
756414cf | 5103 | if (SCM_IMP (proc)) |
d0b07b5d | 5104 | return NULL; |
2510c810 | 5105 | |
756414cf MD |
5106 | switch (SCM_TYP7 (proc)) |
5107 | { | |
5108 | case scm_tc7_subr_0: | |
2510c810 DH |
5109 | trampoline = call_subr0_0; |
5110 | break; | |
756414cf | 5111 | case scm_tc7_subr_1o: |
2510c810 DH |
5112 | trampoline = call_subr1o_0; |
5113 | break; | |
756414cf | 5114 | case scm_tc7_lsubr: |
2510c810 DH |
5115 | trampoline = call_lsubr_0; |
5116 | break; | |
756414cf MD |
5117 | case scm_tcs_closures: |
5118 | { | |
5119 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 5120 | if (scm_is_null (formals) || !scm_is_pair (formals)) |
2510c810 | 5121 | trampoline = scm_i_call_closure_0; |
756414cf | 5122 | else |
d0b07b5d | 5123 | return NULL; |
2510c810 | 5124 | break; |
756414cf MD |
5125 | } |
5126 | case scm_tcs_struct: | |
5127 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5128 | trampoline = scm_call_generic_0; |
2ca0d207 | 5129 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5130 | trampoline = scm_call_0; |
5131 | else | |
5132 | return NULL; | |
5133 | break; | |
756414cf MD |
5134 | case scm_tc7_smob: |
5135 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5136 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 5137 | else |
d0b07b5d | 5138 | return NULL; |
2510c810 | 5139 | break; |
756414cf MD |
5140 | case scm_tc7_asubr: |
5141 | case scm_tc7_rpsubr: | |
5142 | case scm_tc7_cclo: | |
5143 | case scm_tc7_pws: | |
2510c810 DH |
5144 | trampoline = scm_call_0; |
5145 | break; | |
756414cf | 5146 | default: |
2510c810 | 5147 | return NULL; /* not applicable on zero arguments */ |
756414cf | 5148 | } |
2510c810 DH |
5149 | /* We only reach this point if a valid trampoline was determined. */ |
5150 | ||
5151 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5152 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
434f2f7a | 5153 | if (scm_debug_mode_p) |
2510c810 DH |
5154 | return scm_call_0; |
5155 | else | |
5156 | return trampoline; | |
756414cf MD |
5157 | } |
5158 | ||
504d99c5 MD |
5159 | static SCM |
5160 | call_subr1_1 (SCM proc, SCM arg1) | |
5161 | { | |
5162 | return SCM_SUBRF (proc) (arg1); | |
5163 | } | |
5164 | ||
9ed24633 MD |
5165 | static SCM |
5166 | call_subr2o_1 (SCM proc, SCM arg1) | |
5167 | { | |
5168 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
5169 | } | |
5170 | ||
504d99c5 MD |
5171 | static SCM |
5172 | call_lsubr_1 (SCM proc, SCM arg1) | |
5173 | { | |
5174 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
5175 | } | |
5176 | ||
5177 | static SCM | |
5178 | call_dsubr_1 (SCM proc, SCM arg1) | |
5179 | { | |
e11e83f3 | 5180 | if (SCM_I_INUMP (arg1)) |
504d99c5 | 5181 | { |
d9a67fc4 | 5182 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
504d99c5 MD |
5183 | } |
5184 | else if (SCM_REALP (arg1)) | |
5185 | { | |
d9a67fc4 | 5186 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
504d99c5 | 5187 | } |
504d99c5 | 5188 | else if (SCM_BIGP (arg1)) |
f92e85f7 | 5189 | { |
d9a67fc4 | 5190 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
5191 | } |
5192 | else if (SCM_FRACTIONP (arg1)) | |
5193 | { | |
d9a67fc4 | 5194 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 5195 | } |
504d99c5 | 5196 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 5197 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
504d99c5 MD |
5198 | } |
5199 | ||
5200 | static SCM | |
5201 | call_cxr_1 (SCM proc, SCM arg1) | |
5202 | { | |
a61f4e0c | 5203 | return scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc)); |
504d99c5 MD |
5204 | } |
5205 | ||
5206 | static SCM | |
5207 | call_closure_1 (SCM proc, SCM arg1) | |
5208 | { | |
6a3f13f0 DH |
5209 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5210 | scm_list_1 (arg1), | |
5211 | SCM_ENV (proc)); | |
5212 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5213 | return result; |
504d99c5 MD |
5214 | } |
5215 | ||
5216 | scm_t_trampoline_1 | |
5217 | scm_trampoline_1 (SCM proc) | |
5218 | { | |
2510c810 DH |
5219 | scm_t_trampoline_1 trampoline; |
5220 | ||
504d99c5 | 5221 | if (SCM_IMP (proc)) |
d0b07b5d | 5222 | return NULL; |
2510c810 | 5223 | |
504d99c5 MD |
5224 | switch (SCM_TYP7 (proc)) |
5225 | { | |
5226 | case scm_tc7_subr_1: | |
5227 | case scm_tc7_subr_1o: | |
2510c810 DH |
5228 | trampoline = call_subr1_1; |
5229 | break; | |
9ed24633 | 5230 | case scm_tc7_subr_2o: |
2510c810 DH |
5231 | trampoline = call_subr2o_1; |
5232 | break; | |
504d99c5 | 5233 | case scm_tc7_lsubr: |
2510c810 DH |
5234 | trampoline = call_lsubr_1; |
5235 | break; | |
14b18ed6 | 5236 | case scm_tc7_dsubr: |
2510c810 DH |
5237 | trampoline = call_dsubr_1; |
5238 | break; | |
504d99c5 | 5239 | case scm_tc7_cxr: |
2510c810 DH |
5240 | trampoline = call_cxr_1; |
5241 | break; | |
504d99c5 MD |
5242 | case scm_tcs_closures: |
5243 | { | |
5244 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5245 | if (!scm_is_null (formals) |
5246 | && (!scm_is_pair (formals) || !scm_is_pair (SCM_CDR (formals)))) | |
2510c810 | 5247 | trampoline = call_closure_1; |
504d99c5 | 5248 | else |
d0b07b5d | 5249 | return NULL; |
2510c810 | 5250 | break; |
504d99c5 MD |
5251 | } |
5252 | case scm_tcs_struct: | |
5253 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5254 | trampoline = scm_call_generic_1; |
2ca0d207 | 5255 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5256 | trampoline = scm_call_1; |
5257 | else | |
5258 | return NULL; | |
5259 | break; | |
504d99c5 MD |
5260 | case scm_tc7_smob: |
5261 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5262 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 5263 | else |
d0b07b5d | 5264 | return NULL; |
2510c810 | 5265 | break; |
504d99c5 MD |
5266 | case scm_tc7_asubr: |
5267 | case scm_tc7_rpsubr: | |
5268 | case scm_tc7_cclo: | |
5269 | case scm_tc7_pws: | |
2510c810 DH |
5270 | trampoline = scm_call_1; |
5271 | break; | |
504d99c5 | 5272 | default: |
d0b07b5d | 5273 | return NULL; /* not applicable on one arg */ |
504d99c5 | 5274 | } |
2510c810 DH |
5275 | /* We only reach this point if a valid trampoline was determined. */ |
5276 | ||
5277 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5278 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
434f2f7a | 5279 | if (scm_debug_mode_p) |
2510c810 DH |
5280 | return scm_call_1; |
5281 | else | |
5282 | return trampoline; | |
504d99c5 MD |
5283 | } |
5284 | ||
5285 | static SCM | |
5286 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5287 | { | |
5288 | return SCM_SUBRF (proc) (arg1, arg2); | |
5289 | } | |
5290 | ||
9ed24633 MD |
5291 | static SCM |
5292 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5293 | { | |
5294 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
5295 | } | |
5296 | ||
504d99c5 MD |
5297 | static SCM |
5298 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
5299 | { | |
5300 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
5301 | } | |
5302 | ||
5303 | static SCM | |
5304 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
5305 | { | |
6a3f13f0 DH |
5306 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5307 | scm_list_2 (arg1, arg2), | |
5308 | SCM_ENV (proc)); | |
5309 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5310 | return result; |
504d99c5 MD |
5311 | } |
5312 | ||
5313 | scm_t_trampoline_2 | |
5314 | scm_trampoline_2 (SCM proc) | |
5315 | { | |
2510c810 DH |
5316 | scm_t_trampoline_2 trampoline; |
5317 | ||
504d99c5 | 5318 | if (SCM_IMP (proc)) |
d0b07b5d | 5319 | return NULL; |
2510c810 | 5320 | |
504d99c5 MD |
5321 | switch (SCM_TYP7 (proc)) |
5322 | { | |
5323 | case scm_tc7_subr_2: | |
5324 | case scm_tc7_subr_2o: | |
5325 | case scm_tc7_rpsubr: | |
5326 | case scm_tc7_asubr: | |
2510c810 DH |
5327 | trampoline = call_subr2_2; |
5328 | break; | |
9ed24633 | 5329 | case scm_tc7_lsubr_2: |
2510c810 DH |
5330 | trampoline = call_lsubr2_2; |
5331 | break; | |
504d99c5 | 5332 | case scm_tc7_lsubr: |
2510c810 DH |
5333 | trampoline = call_lsubr_2; |
5334 | break; | |
504d99c5 MD |
5335 | case scm_tcs_closures: |
5336 | { | |
5337 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5338 | if (!scm_is_null (formals) |
5339 | && (!scm_is_pair (formals) | |
5340 | || (!scm_is_null (SCM_CDR (formals)) | |
5341 | && (!scm_is_pair (SCM_CDR (formals)) | |
5342 | || !scm_is_pair (SCM_CDDR (formals)))))) | |
2510c810 | 5343 | trampoline = call_closure_2; |
504d99c5 | 5344 | else |
d0b07b5d | 5345 | return NULL; |
2510c810 | 5346 | break; |
504d99c5 MD |
5347 | } |
5348 | case scm_tcs_struct: | |
5349 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5350 | trampoline = scm_call_generic_2; |
2ca0d207 | 5351 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5352 | trampoline = scm_call_2; |
5353 | else | |
5354 | return NULL; | |
5355 | break; | |
504d99c5 MD |
5356 | case scm_tc7_smob: |
5357 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5358 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5359 | else |
d0b07b5d | 5360 | return NULL; |
2510c810 | 5361 | break; |
504d99c5 MD |
5362 | case scm_tc7_cclo: |
5363 | case scm_tc7_pws: | |
2510c810 DH |
5364 | trampoline = scm_call_2; |
5365 | break; | |
504d99c5 | 5366 | default: |
d0b07b5d | 5367 | return NULL; /* not applicable on two args */ |
504d99c5 | 5368 | } |
2510c810 DH |
5369 | /* We only reach this point if a valid trampoline was determined. */ |
5370 | ||
5371 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5372 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
434f2f7a | 5373 | if (scm_debug_mode_p) |
2510c810 DH |
5374 | return scm_call_2; |
5375 | else | |
5376 | return trampoline; | |
504d99c5 MD |
5377 | } |
5378 | ||
d9c393f5 JB |
5379 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5380 | ||
47c3f06d | 5381 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5382 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5383 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5384 | static inline void |
47c3f06d | 5385 | check_map_args (SCM argv, |
c014a02e | 5386 | long len, |
47c3f06d MD |
5387 | SCM gf, |
5388 | SCM proc, | |
5389 | SCM args, | |
5390 | const char *who) | |
d9c393f5 | 5391 | { |
c014a02e | 5392 | long i; |
d9c393f5 | 5393 | |
4057a3e0 | 5394 | for (i = SCM_SIMPLE_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5395 | { |
4057a3e0 MV |
5396 | SCM elt = SCM_SIMPLE_VECTOR_REF (argv, i); |
5397 | long elt_len = scm_ilength (elt); | |
d9c393f5 JB |
5398 | |
5399 | if (elt_len < 0) | |
47c3f06d MD |
5400 | { |
5401 | if (gf) | |
5402 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5403 | else | |
4057a3e0 | 5404 | scm_wrong_type_arg (who, i + 2, elt); |
47c3f06d | 5405 | } |
d9c393f5 JB |
5406 | |
5407 | if (elt_len != len) | |
4057a3e0 | 5408 | scm_out_of_range_pos (who, elt, scm_from_long (i + 2)); |
d9c393f5 | 5409 | } |
d9c393f5 JB |
5410 | } |
5411 | ||
5412 | ||
47c3f06d | 5413 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5414 | |
368bf056 MD |
5415 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5416 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5417 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5418 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5419 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5420 | */ |
5421 | ||
0f2d19dd | 5422 | SCM |
1bbd0b84 | 5423 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5424 | #define FUNC_NAME s_map |
0f2d19dd | 5425 | { |
c014a02e | 5426 | long i, len; |
0f2d19dd JB |
5427 | SCM res = SCM_EOL; |
5428 | SCM *pres = &res; | |
0f2d19dd | 5429 | |
d9c393f5 | 5430 | len = scm_ilength (arg1); |
47c3f06d MD |
5431 | SCM_GASSERTn (len >= 0, |
5432 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5433 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5434 | if (scm_is_null (args)) |
0f2d19dd | 5435 | { |
504d99c5 MD |
5436 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5437 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5438 | while (SCM_NIMP (arg1)) | |
5439 | { | |
5440 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5441 | pres = SCM_CDRLOC (*pres); | |
5442 | arg1 = SCM_CDR (arg1); | |
5443 | } | |
5444 | return res; | |
5445 | } | |
a61f4e0c | 5446 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5447 | { |
5448 | SCM arg2 = SCM_CAR (args); | |
5449 | int len2 = scm_ilength (arg2); | |
5450 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5451 | SCM_GASSERTn (call, | |
5452 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5453 | SCM_GASSERTn (len2 >= 0, | |
5454 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5455 | if (len2 != len) | |
5456 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5457 | while (SCM_NIMP (arg1)) |
5458 | { | |
504d99c5 | 5459 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5460 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5461 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5462 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5463 | } |
5464 | return res; | |
5465 | } | |
05b15362 DH |
5466 | arg1 = scm_cons (arg1, args); |
5467 | args = scm_vector (arg1); | |
47c3f06d | 5468 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5469 | while (1) |
5470 | { | |
5471 | arg1 = SCM_EOL; | |
4057a3e0 | 5472 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5473 | { |
4057a3e0 MV |
5474 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5475 | if (SCM_IMP (elt)) | |
d9c393f5 | 5476 | return res; |
4057a3e0 MV |
5477 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5478 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd | 5479 | } |
8ea46249 | 5480 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5481 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5482 | } |
5483 | } | |
af45e3b0 | 5484 | #undef FUNC_NAME |
0f2d19dd JB |
5485 | |
5486 | ||
47c3f06d | 5487 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5488 | |
0f2d19dd | 5489 | SCM |
1bbd0b84 | 5490 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5491 | #define FUNC_NAME s_for_each |
0f2d19dd | 5492 | { |
c014a02e | 5493 | long i, len; |
d9c393f5 | 5494 | len = scm_ilength (arg1); |
47c3f06d MD |
5495 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5496 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5497 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5498 | if (scm_is_null (args)) |
0f2d19dd | 5499 | { |
504d99c5 MD |
5500 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5501 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5502 | while (SCM_NIMP (arg1)) | |
5503 | { | |
5504 | call (proc, SCM_CAR (arg1)); | |
5505 | arg1 = SCM_CDR (arg1); | |
5506 | } | |
5507 | return SCM_UNSPECIFIED; | |
5508 | } | |
a61f4e0c | 5509 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5510 | { |
5511 | SCM arg2 = SCM_CAR (args); | |
5512 | int len2 = scm_ilength (arg2); | |
5513 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5514 | SCM_GASSERTn (call, g_for_each, | |
5515 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5516 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5517 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5518 | if (len2 != len) | |
5519 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5520 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5521 | { |
504d99c5 | 5522 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5523 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5524 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5525 | } |
5526 | return SCM_UNSPECIFIED; | |
5527 | } | |
05b15362 DH |
5528 | arg1 = scm_cons (arg1, args); |
5529 | args = scm_vector (arg1); | |
47c3f06d | 5530 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5531 | while (1) |
5532 | { | |
5533 | arg1 = SCM_EOL; | |
4057a3e0 | 5534 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5535 | { |
4057a3e0 MV |
5536 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5537 | if (SCM_IMP (elt)) | |
c96d76b8 | 5538 | return SCM_UNSPECIFIED; |
4057a3e0 MV |
5539 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5540 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd JB |
5541 | } |
5542 | scm_apply (proc, arg1, SCM_EOL); | |
5543 | } | |
5544 | } | |
af45e3b0 | 5545 | #undef FUNC_NAME |
0f2d19dd | 5546 | |
1cc91f1b | 5547 | |
0f2d19dd | 5548 | SCM |
6e8d25a6 | 5549 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5550 | { |
16d4699b MV |
5551 | SCM z; |
5552 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5553 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5554 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5555 | return z; |
5556 | } | |
5557 | ||
5558 | ||
92c2555f | 5559 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5560 | |
0f2d19dd | 5561 | SCM |
6e8d25a6 | 5562 | scm_makprom (SCM code) |
0f2d19dd | 5563 | { |
28d52ebb MD |
5564 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5565 | SCM_UNPACK (code), | |
9de87eea MV |
5566 | scm_make_recursive_mutex ()); |
5567 | } | |
5568 | ||
5569 | static SCM | |
5570 | promise_mark (SCM promise) | |
5571 | { | |
5572 | scm_gc_mark (SCM_PROMISE_MUTEX (promise)); | |
5573 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd JB |
5574 | } |
5575 | ||
28d52ebb MD |
5576 | static size_t |
5577 | promise_free (SCM promise) | |
5578 | { | |
28d52ebb MD |
5579 | return 0; |
5580 | } | |
1cc91f1b | 5581 | |
0f2d19dd | 5582 | static int |
e841c3e0 | 5583 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5584 | { |
19402679 | 5585 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5586 | scm_puts ("#<promise ", port); |
19402679 | 5587 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5588 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5589 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5590 | scm_putc ('>', port); |
0f2d19dd JB |
5591 | return !0; |
5592 | } | |
5593 | ||
3b3b36dd | 5594 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5595 | (SCM promise), |
67e8151b MG |
5596 | "If the promise @var{x} has not been computed yet, compute and\n" |
5597 | "return @var{x}, otherwise just return the previously computed\n" | |
5598 | "value.") | |
1bbd0b84 | 5599 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5600 | { |
28d52ebb | 5601 | SCM_VALIDATE_SMOB (1, promise, promise); |
9de87eea | 5602 | scm_lock_mutex (SCM_PROMISE_MUTEX (promise)); |
28d52ebb | 5603 | if (!SCM_PROMISE_COMPUTED_P (promise)) |
0f2d19dd | 5604 | { |
28d52ebb MD |
5605 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5606 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5607 | { |
28d52ebb MD |
5608 | SCM_SET_PROMISE_DATA (promise, ans); |
5609 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5610 | } |
5611 | } | |
9de87eea | 5612 | scm_unlock_mutex (SCM_PROMISE_MUTEX (promise)); |
28d52ebb | 5613 | return SCM_PROMISE_DATA (promise); |
0f2d19dd | 5614 | } |
1bbd0b84 | 5615 | #undef FUNC_NAME |
0f2d19dd | 5616 | |
445f675c | 5617 | |
a1ec6916 | 5618 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5619 | (SCM obj), |
b380b885 | 5620 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5621 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5622 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5623 | { |
7888309b | 5624 | return scm_from_bool (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5625 | } |
1bbd0b84 | 5626 | #undef FUNC_NAME |
0f2d19dd | 5627 | |
445f675c | 5628 | |
a1ec6916 | 5629 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5630 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5631 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5632 | "Any source properties associated with @var{xorig} are also associated\n" | |
5633 | "with the new pair.") | |
1bbd0b84 | 5634 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5635 | { |
5636 | SCM p, z; | |
16d4699b | 5637 | z = scm_cons (x, y); |
26d5b9b4 MD |
5638 | /* Copy source properties possibly associated with xorig. */ |
5639 | p = scm_whash_lookup (scm_source_whash, xorig); | |
7888309b | 5640 | if (scm_is_true (p)) |
26d5b9b4 MD |
5641 | scm_whash_insert (scm_source_whash, z, p); |
5642 | return z; | |
5643 | } | |
1bbd0b84 | 5644 | #undef FUNC_NAME |
26d5b9b4 | 5645 | |
445f675c | 5646 | |
62360b89 DH |
5647 | /* The function scm_copy_tree is used to copy an expression tree to allow the |
5648 | * memoizer to modify the expression during memoization. scm_copy_tree | |
5649 | * creates deep copies of pairs and vectors, but not of any other data types, | |
5650 | * since only pairs and vectors will be parsed by the memoizer. | |
5651 | * | |
5652 | * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise | |
5653 | * pattern is used to detect cycles. In fact, the pattern is used in two | |
5654 | * dimensions, vertical (indicated in the code by the variable names 'hare' | |
5655 | * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both | |
5656 | * dimensions, the hare/rabbit will take two steps when the tortoise/turtle | |
5657 | * takes one. | |
5658 | * | |
5659 | * The vertical dimension corresponds to recursive calls to function | |
5660 | * copy_tree: This happens when descending into vector elements, into cars of | |
5661 | * lists and into the cdr of an improper list. In this dimension, the | |
5662 | * tortoise follows the hare by using the processor stack: Every stack frame | |
5663 | * will hold an instance of struct t_trace. These instances are connected in | |
5664 | * a way that represents the trace of the hare, which thus can be followed by | |
5665 | * the tortoise. The tortoise will always point to struct t_trace instances | |
5666 | * relating to SCM objects that have already been copied. Thus, a cycle is | |
5667 | * detected if the tortoise and the hare point to the same object, | |
5668 | * | |
5669 | * The horizontal dimension is within one execution of copy_tree, when the | |
5670 | * function cdr's along the pairs of a list. This is the standard | |
5671 | * hare-and-tortoise implementation, found several times in guile. */ | |
5672 | ||
5673 | struct t_trace { | |
5674 | struct t_trace *trace; // These pointers form a trace along the stack. | |
5675 | SCM obj; // The object handled at the respective stack frame. | |
5676 | }; | |
5677 | ||
5678 | static SCM | |
5679 | copy_tree ( | |
5680 | struct t_trace *const hare, | |
5681 | struct t_trace *tortoise, | |
5682 | unsigned int tortoise_delay ) | |
5683 | { | |
4057a3e0 | 5684 | if (!scm_is_pair (hare->obj) && !scm_is_simple_vector (hare->obj)) |
62360b89 DH |
5685 | { |
5686 | return hare->obj; | |
5687 | } | |
5688 | else | |
5689 | { | |
5690 | /* Prepare the trace along the stack. */ | |
5691 | struct t_trace new_hare; | |
5692 | hare->trace = &new_hare; | |
5693 | ||
5694 | /* The tortoise will make its step after the delay has elapsed. Note | |
5695 | * that in contrast to the typical hare-and-tortoise pattern, the step | |
5696 | * of the tortoise happens before the hare takes its steps. This is, in | |
5697 | * principle, no problem, except for the start of the algorithm: Then, | |
5fb64383 | 5698 | * it has to be made sure that the hare actually gets its advantage of |
62360b89 DH |
5699 | * two steps. */ |
5700 | if (tortoise_delay == 0) | |
5701 | { | |
5702 | tortoise_delay = 1; | |
5703 | tortoise = tortoise->trace; | |
bc36d050 | 5704 | ASSERT_SYNTAX (!scm_is_eq (hare->obj, tortoise->obj), |
62360b89 DH |
5705 | s_bad_expression, hare->obj); |
5706 | } | |
5707 | else | |
5708 | { | |
5709 | --tortoise_delay; | |
5710 | } | |
5711 | ||
4057a3e0 | 5712 | if (scm_is_simple_vector (hare->obj)) |
62360b89 | 5713 | { |
4057a3e0 MV |
5714 | size_t length = SCM_SIMPLE_VECTOR_LENGTH (hare->obj); |
5715 | SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED); | |
62360b89 DH |
5716 | |
5717 | /* Each vector element is copied by recursing into copy_tree, having | |
5718 | * the tortoise follow the hare into the depths of the stack. */ | |
5719 | unsigned long int i; | |
5720 | for (i = 0; i < length; ++i) | |
5721 | { | |
5722 | SCM new_element; | |
4057a3e0 | 5723 | new_hare.obj = SCM_SIMPLE_VECTOR_REF (hare->obj, i); |
62360b89 | 5724 | new_element = copy_tree (&new_hare, tortoise, tortoise_delay); |
4057a3e0 | 5725 | SCM_SIMPLE_VECTOR_SET (new_vector, i, new_element); |
62360b89 DH |
5726 | } |
5727 | ||
5728 | return new_vector; | |
5729 | } | |
a61f4e0c | 5730 | else // scm_is_pair (hare->obj) |
62360b89 DH |
5731 | { |
5732 | SCM result; | |
5733 | SCM tail; | |
5734 | ||
5735 | SCM rabbit = hare->obj; | |
5736 | SCM turtle = hare->obj; | |
5737 | ||
5738 | SCM copy; | |
5739 | ||
5740 | /* The first pair of the list is treated specially, in order to | |
5741 | * preserve a potential source code position. */ | |
5742 | result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL); | |
5743 | new_hare.obj = SCM_CAR (rabbit); | |
5744 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5745 | SCM_SETCAR (tail, copy); | |
5746 | ||
5747 | /* The remaining pairs of the list are copied by, horizontally, | |
5748 | * having the turtle follow the rabbit, and, vertically, having the | |
5749 | * tortoise follow the hare into the depths of the stack. */ | |
5750 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5751 | while (scm_is_pair (rabbit)) |
62360b89 DH |
5752 | { |
5753 | new_hare.obj = SCM_CAR (rabbit); | |
5754 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5755 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5756 | tail = SCM_CDR (tail); | |
5757 | ||
5758 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5759 | if (scm_is_pair (rabbit)) |
62360b89 DH |
5760 | { |
5761 | new_hare.obj = SCM_CAR (rabbit); | |
5762 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5763 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5764 | tail = SCM_CDR (tail); | |
5765 | rabbit = SCM_CDR (rabbit); | |
5766 | ||
5767 | turtle = SCM_CDR (turtle); | |
bc36d050 | 5768 | ASSERT_SYNTAX (!scm_is_eq (rabbit, turtle), |
62360b89 DH |
5769 | s_bad_expression, rabbit); |
5770 | } | |
5771 | } | |
5772 | ||
5773 | /* We have to recurse into copy_tree again for the last cdr, in | |
5774 | * order to handle the situation that it holds a vector. */ | |
5775 | new_hare.obj = rabbit; | |
5776 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5777 | SCM_SETCDR (tail, copy); | |
5778 | ||
5779 | return result; | |
5780 | } | |
5781 | } | |
5782 | } | |
5783 | ||
a1ec6916 | 5784 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5785 | (SCM obj), |
b380b885 | 5786 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
bfefbf18 | 5787 | "the new data structure. @code{copy-tree} recurses down the\n" |
b380b885 MD |
5788 | "contents of both pairs and vectors (since both cons cells and vector\n" |
5789 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5790 | "any other object.") | |
1bbd0b84 | 5791 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd | 5792 | { |
62360b89 DH |
5793 | /* Prepare the trace along the stack. */ |
5794 | struct t_trace trace; | |
5795 | trace.obj = obj; | |
5796 | ||
5797 | /* In function copy_tree, if the tortoise makes its step, it will do this | |
5798 | * before the hare has the chance to move. Thus, we have to make sure that | |
5799 | * the very first step of the tortoise will not happen after the hare has | |
5800 | * really made two steps. This is achieved by passing '2' as the initial | |
5801 | * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare | |
5802 | * a bigger advantage may improve performance slightly. */ | |
5803 | return copy_tree (&trace, &trace, 2); | |
0f2d19dd | 5804 | } |
1bbd0b84 | 5805 | #undef FUNC_NAME |
0f2d19dd | 5806 | |
1cc91f1b | 5807 | |
4163eb72 MV |
5808 | /* We have three levels of EVAL here: |
5809 | ||
5810 | - scm_i_eval (exp, env) | |
5811 | ||
5812 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5813 | structure as used by the actual tree code evaluator. When ENV is | |
5814 | a top-level environment, then changes to the current module are | |
a513ead3 | 5815 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5816 | the current module. |
5817 | ||
5818 | - scm_primitive_eval (exp) | |
5819 | ||
5820 | evaluates EXP in the top-level environment as determined by the | |
5821 | current module. This is done by constructing a suitable | |
5822 | environment and calling scm_i_eval. Thus, changes to the | |
5823 | top-level module are tracked normally. | |
5824 | ||
9de87eea | 5825 | - scm_eval (exp, mod_or_state) |
4163eb72 | 5826 | |
9de87eea MV |
5827 | evaluates EXP while MOD_OR_STATE is the current module or current |
5828 | dynamic state (as appropriate). This is done by setting the | |
5829 | current module (or dynamic state) to MOD_OR_STATE, invoking | |
5830 | scm_primitive_eval on EXP, and then restoring the current module | |
5831 | (or dynamic state) to the value it had previously. That is, | |
5832 | while EXP is evaluated, changes to the current module (or dynamic | |
5833 | state) are tracked, but these changes do not persist when | |
4163eb72 MV |
5834 | scm_eval returns. |
5835 | ||
5836 | For each level of evals, there are two variants, distinguished by a | |
5837 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5838 | variant can destructively modify EXP into something completely | |
5839 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5840 | _x variants should not ever be used again for anything. So when in | |
5841 | doubt, use the ordinary variant. | |
5842 | ||
5843 | */ | |
5844 | ||
0f2d19dd | 5845 | SCM |
68d8be66 | 5846 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5847 | { |
cc95e00a | 5848 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5849 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5850 | else | |
385609b9 | 5851 | return SCM_I_XEVAL (exp, env); |
0f2d19dd JB |
5852 | } |
5853 | ||
68d8be66 MD |
5854 | SCM |
5855 | scm_i_eval (SCM exp, SCM env) | |
5856 | { | |
26fb6390 | 5857 | exp = scm_copy_tree (exp); |
cc95e00a | 5858 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5859 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5860 | else | |
385609b9 | 5861 | return SCM_I_XEVAL (exp, env); |
68d8be66 MD |
5862 | } |
5863 | ||
5864 | SCM | |
4163eb72 | 5865 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5866 | { |
a513ead3 | 5867 | SCM env; |
bcdab802 | 5868 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5869 | if (SCM_NIMP (transformer)) |
fdc28395 | 5870 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5871 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5872 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5873 | } |
5874 | ||
4163eb72 MV |
5875 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5876 | (SCM exp), | |
2069af38 | 5877 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5878 | "the current module.") |
5879 | #define FUNC_NAME s_scm_primitive_eval | |
5880 | { | |
a513ead3 | 5881 | SCM env; |
bcdab802 | 5882 | SCM transformer = scm_current_module_transformer (); |
7888309b | 5883 | if (scm_is_true (transformer)) |
fdc28395 | 5884 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5885 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5886 | return scm_i_eval (exp, env); |
5887 | } | |
5888 | #undef FUNC_NAME | |
5889 | ||
6bff1368 | 5890 | |
68d8be66 MD |
5891 | /* Eval does not take the second arg optionally. This is intentional |
5892 | * in order to be R5RS compatible, and to prepare for the new module | |
5893 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5894 | * environment explicit. */ |
549e6ec6 | 5895 | |
4163eb72 | 5896 | SCM |
9de87eea | 5897 | scm_eval_x (SCM exp, SCM module_or_state) |
4163eb72 | 5898 | { |
9de87eea | 5899 | SCM res; |
4163eb72 | 5900 | |
9de87eea MV |
5901 | scm_frame_begin (SCM_F_FRAME_REWINDABLE); |
5902 | if (scm_is_dynamic_state (module_or_state)) | |
5903 | scm_frame_current_dynamic_state (module_or_state); | |
5904 | else | |
5905 | scm_frame_current_module (module_or_state); | |
4163eb72 | 5906 | |
9de87eea MV |
5907 | res = scm_primitive_eval_x (exp); |
5908 | ||
5909 | scm_frame_end (); | |
5910 | return res; | |
4163eb72 | 5911 | } |
09074dbf | 5912 | |
68d8be66 | 5913 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
9de87eea | 5914 | (SCM exp, SCM module_or_state), |
4163eb72 | 5915 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" |
9de87eea MV |
5916 | "in the top-level environment specified by\n" |
5917 | "@var{module_or_state}.\n" | |
8f85c0c6 | 5918 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
9de87eea MV |
5919 | "@var{module_or_state} is made the current module when\n" |
5920 | "it is a module, or the current dynamic state when it is\n" | |
5921 | "a dynamic state." | |
6be1fab9 | 5922 | "Example: (eval '(+ 1 2) (interaction-environment))") |
1bbd0b84 | 5923 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5924 | { |
9de87eea MV |
5925 | SCM res; |
5926 | ||
5927 | scm_frame_begin (SCM_F_FRAME_REWINDABLE); | |
5928 | if (scm_is_dynamic_state (module_or_state)) | |
5929 | scm_frame_current_dynamic_state (module_or_state); | |
5930 | else | |
5931 | scm_frame_current_module (module_or_state); | |
5932 | ||
5933 | res = scm_primitive_eval (exp); | |
09074dbf | 5934 | |
9de87eea MV |
5935 | scm_frame_end (); |
5936 | return res; | |
0f2d19dd | 5937 | } |
1bbd0b84 | 5938 | #undef FUNC_NAME |
0f2d19dd | 5939 | |
6dbd0af5 | 5940 | |
434f2f7a | 5941 | /* At this point, deval and scm_dapply are generated. |
6dbd0af5 MD |
5942 | */ |
5943 | ||
a44a9715 DH |
5944 | #define DEVAL |
5945 | #include "eval.c" | |
0f2d19dd | 5946 | |
1cc91f1b | 5947 | |
434f2f7a DH |
5948 | #if (SCM_ENABLE_DEPRECATED == 1) |
5949 | ||
5950 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5951 | SCM scm_ceval (SCM x, SCM env) | |
5952 | { | |
a61f4e0c | 5953 | if (scm_is_pair (x)) |
434f2f7a | 5954 | return ceval (x, env); |
cc95e00a | 5955 | else if (scm_is_symbol (x)) |
434f2f7a DH |
5956 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
5957 | else | |
385609b9 | 5958 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
5959 | } |
5960 | ||
5961 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5962 | SCM scm_deval (SCM x, SCM env) | |
5963 | { | |
a61f4e0c | 5964 | if (scm_is_pair (x)) |
434f2f7a | 5965 | return deval (x, env); |
cc95e00a | 5966 | else if (scm_is_symbol (x)) |
434f2f7a DH |
5967 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
5968 | else | |
385609b9 | 5969 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
5970 | } |
5971 | ||
5972 | static SCM | |
5973 | dispatching_eval (SCM x, SCM env) | |
5974 | { | |
5975 | if (scm_debug_mode_p) | |
5976 | return scm_deval (x, env); | |
5977 | else | |
5978 | return scm_ceval (x, env); | |
5979 | } | |
5980 | ||
5981 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5982 | SCM (*scm_ceval_ptr) (SCM x, SCM env) = dispatching_eval; | |
5983 | ||
5984 | #endif | |
5985 | ||
5986 | ||
0f2d19dd JB |
5987 | void |
5988 | scm_init_eval () | |
0f2d19dd | 5989 | { |
33b97402 MD |
5990 | scm_init_opts (scm_evaluator_traps, |
5991 | scm_evaluator_trap_table, | |
5992 | SCM_N_EVALUATOR_TRAPS); | |
5993 | scm_init_opts (scm_eval_options_interface, | |
5994 | scm_eval_opts, | |
5995 | SCM_N_EVAL_OPTIONS); | |
5996 | ||
f99c9c28 | 5997 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
9de87eea | 5998 | scm_set_smob_mark (scm_tc16_promise, promise_mark); |
28d52ebb | 5999 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 6000 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 6001 | |
a44a9715 DH |
6002 | undefineds = scm_list_1 (SCM_UNDEFINED); |
6003 | SCM_SETCDR (undefineds, undefineds); | |
6004 | scm_permanent_object (undefineds); | |
7c33806a | 6005 | |
a44a9715 | 6006 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 6007 | |
a44a9715 DH |
6008 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
6009 | scm_permanent_object (f_apply); | |
86d31dfe | 6010 | |
a0599745 | 6011 | #include "libguile/eval.x" |
60a49842 | 6012 | |
25eaf21a | 6013 | scm_add_feature ("delay"); |
0f2d19dd | 6014 | } |
0f2d19dd | 6015 | |
6dbd0af5 | 6016 | #endif /* !DEVAL */ |
89e00824 ML |
6017 | |
6018 | /* | |
6019 | Local Variables: | |
6020 | c-file-style: "gnu" | |
6021 | End: | |
6022 | */ |