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 | ||
434f2f7a DH |
21 | /* This file is read twice in order to produce debugging versions of ceval and |
22 | * scm_apply. These functions, deval and scm_dapply, are produced when we | |
23 | * define the preprocessor macro DEVAL. The file is divided into sections | |
24 | * which are treated differently with respect to DEVAL. The heads of these | |
25 | * sections are marked with the string "SECTION:". */ | |
6dbd0af5 | 26 | |
6dbd0af5 | 27 | /* SECTION: This code is compiled once. |
0f2d19dd JB |
28 | */ |
29 | ||
3d05f2e0 RB |
30 | #if HAVE_CONFIG_H |
31 | # include <config.h> | |
32 | #endif | |
0f2d19dd | 33 | |
3d05f2e0 RB |
34 | #include "libguile/__scm.h" |
35 | ||
36 | #ifndef DEVAL | |
d16332b3 | 37 | |
48b96f4b JB |
38 | /* AIX requires this to be the first thing in the file. The #pragma |
39 | directive is indented so pre-ANSI compilers will ignore it, rather | |
40 | than choke on it. */ | |
5862b540 | 41 | #ifndef __GNUC__ |
48b96f4b JB |
42 | # if HAVE_ALLOCA_H |
43 | # include <alloca.h> | |
44 | # else | |
45 | # ifdef _AIX | |
ac13d9d2 | 46 | # pragma alloca |
48b96f4b JB |
47 | # else |
48 | # ifndef alloca /* predefined by HP cc +Olibcalls */ | |
49 | char *alloca (); | |
50 | # endif | |
51 | # endif | |
52 | # endif | |
53 | #endif | |
54 | ||
e7313a9d | 55 | #include <assert.h> |
a0599745 | 56 | #include "libguile/_scm.h" |
21628685 DH |
57 | #include "libguile/alist.h" |
58 | #include "libguile/async.h" | |
59 | #include "libguile/continuations.h" | |
a0599745 | 60 | #include "libguile/debug.h" |
328dc9a3 | 61 | #include "libguile/deprecation.h" |
09074dbf | 62 | #include "libguile/dynwind.h" |
a0599745 | 63 | #include "libguile/eq.h" |
21628685 DH |
64 | #include "libguile/feature.h" |
65 | #include "libguile/fluids.h" | |
756414cf | 66 | #include "libguile/futures.h" |
21628685 DH |
67 | #include "libguile/goops.h" |
68 | #include "libguile/hash.h" | |
69 | #include "libguile/hashtab.h" | |
70 | #include "libguile/lang.h" | |
4610b011 | 71 | #include "libguile/list.h" |
a0599745 | 72 | #include "libguile/macros.h" |
a0599745 | 73 | #include "libguile/modules.h" |
21628685 | 74 | #include "libguile/objects.h" |
a0599745 | 75 | #include "libguile/ports.h" |
7e6e6b37 | 76 | #include "libguile/print.h" |
21628685 | 77 | #include "libguile/procprop.h" |
a0599745 | 78 | #include "libguile/root.h" |
21628685 DH |
79 | #include "libguile/smob.h" |
80 | #include "libguile/srcprop.h" | |
81 | #include "libguile/stackchk.h" | |
82 | #include "libguile/strings.h" | |
83 | #include "libguile/throw.h" | |
84 | #include "libguile/validate.h" | |
a513ead3 | 85 | #include "libguile/values.h" |
21628685 | 86 | #include "libguile/vectors.h" |
a0599745 | 87 | |
a0599745 | 88 | #include "libguile/eval.h" |
89efbff4 | 89 | |
0f2d19dd JB |
90 | \f |
91 | ||
212e58ed | 92 | static SCM unmemoize_exprs (SCM expr, SCM env); |
0f572ba7 | 93 | static SCM canonicalize_define (SCM expr); |
e5156567 | 94 | static SCM *scm_lookupcar1 (SCM vloc, SCM genv, int check); |
212e58ed | 95 | static SCM unmemoize_builtin_macro (SCM expr, SCM env); |
0f572ba7 DH |
96 | |
97 | \f | |
98 | ||
e6729603 DH |
99 | /* {Syntax Errors} |
100 | * | |
101 | * This section defines the message strings for the syntax errors that can be | |
102 | * detected during memoization and the functions and macros that shall be | |
103 | * called by the memoizer code to signal syntax errors. */ | |
104 | ||
105 | ||
106 | /* Syntax errors that can be detected during memoization: */ | |
107 | ||
108 | /* Circular or improper lists do not form valid scheme expressions. If a | |
109 | * circular list or an improper list is detected in a place where a scheme | |
110 | * expression is expected, a 'Bad expression' error is signalled. */ | |
111 | static const char s_bad_expression[] = "Bad expression"; | |
112 | ||
89bff2fc DH |
113 | /* If a form is detected that holds a different number of expressions than are |
114 | * required in that context, a 'Missing or extra expression' error is | |
115 | * signalled. */ | |
116 | static const char s_expression[] = "Missing or extra expression in"; | |
117 | ||
cc56ba80 | 118 | /* If a form is detected that holds less expressions than are required in that |
8ae95199 | 119 | * context, a 'Missing expression' error is signalled. */ |
cc56ba80 DH |
120 | static const char s_missing_expression[] = "Missing expression in"; |
121 | ||
609a8b86 | 122 | /* If a form is detected that holds more expressions than are allowed in that |
8ae95199 | 123 | * context, an 'Extra expression' error is signalled. */ |
609a8b86 DH |
124 | static const char s_extra_expression[] = "Extra expression in"; |
125 | ||
89bff2fc DH |
126 | /* The empty combination '()' is not allowed as an expression in scheme. If |
127 | * it is detected in a place where an expression is expected, an 'Illegal | |
128 | * empty combination' error is signalled. Note: If you encounter this error | |
129 | * message, it is very likely that you intended to denote the empty list. To | |
130 | * do so, you need to quote the empty list like (quote ()) or '(). */ | |
131 | static const char s_empty_combination[] = "Illegal empty combination"; | |
132 | ||
c86c440b DH |
133 | /* A body may hold an arbitrary number of internal defines, followed by a |
134 | * non-empty sequence of expressions. If a body with an empty sequence of | |
135 | * expressions is detected, a 'Missing body expression' error is signalled. | |
136 | */ | |
137 | static const char s_missing_body_expression[] = "Missing body expression in"; | |
138 | ||
139 | /* A body may hold an arbitrary number of internal defines, followed by a | |
140 | * non-empty sequence of expressions. Each the definitions and the | |
141 | * expressions may be grouped arbitraryly with begin, but it is not allowed to | |
142 | * mix definitions and expressions. If a define form in a body mixes | |
143 | * definitions and expressions, a 'Mixed definitions and expressions' error is | |
6bff1368 | 144 | * signalled. */ |
c86c440b | 145 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; |
6bff1368 DH |
146 | /* Definitions are only allowed on the top level and at the start of a body. |
147 | * If a definition is detected anywhere else, a 'Bad define placement' error | |
148 | * is signalled. */ | |
149 | static const char s_bad_define[] = "Bad define placement"; | |
c86c440b | 150 | |
2a6f7afe DH |
151 | /* Case or cond expressions must have at least one clause. If a case or cond |
152 | * expression without any clauses is detected, a 'Missing clauses' error is | |
153 | * signalled. */ | |
154 | static const char s_missing_clauses[] = "Missing clauses"; | |
155 | ||
609a8b86 DH |
156 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
157 | * last clause. If after the 'else' case clause further clauses are detected, | |
158 | * a 'Misplaced else clause' error is signalled. */ | |
159 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
160 | ||
2a6f7afe DH |
161 | /* If a case clause is detected that is not in the format |
162 | * (<label(s)> <expression1> <expression2> ...) | |
163 | * a 'Bad case clause' error is signalled. */ | |
164 | static const char s_bad_case_clause[] = "Bad case clause"; | |
165 | ||
2a6f7afe DH |
166 | /* If a case clause is detected where the <label(s)> element is neither a |
167 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
168 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
169 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
170 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
171 | * local or global environment, it is not considered a syntactic keyword, but | |
172 | * will be treated as any other variable. */ | |
173 | static const char s_bad_case_labels[] = "Bad case labels"; | |
174 | ||
175 | /* In a case statement all labels have to be distinct. If in a case statement | |
176 | * a label occurs more than once, a 'Duplicate case label' error is | |
177 | * signalled. */ | |
178 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
179 | ||
609a8b86 DH |
180 | /* If a cond clause is detected that is not in one of the formats |
181 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
182 | * a 'Bad cond clause' error is signalled. */ | |
183 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
184 | ||
185 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
186 | * not hold a recipient element for the test result, a 'Missing recipient' | |
187 | * error is signalled. */ | |
188 | static const char s_missing_recipient[] = "Missing recipient in"; | |
189 | ||
cc56ba80 DH |
190 | /* If in a position where a variable name is required some other object is |
191 | * detected, a 'Bad variable' error is signalled. */ | |
192 | static const char s_bad_variable[] = "Bad variable"; | |
193 | ||
a954ce1d DH |
194 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
195 | * possibly empty list. If any other object is detected in a place where a | |
196 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
197 | static const char s_bad_bindings[] = "Bad bindings"; | |
198 | ||
199 | /* Depending on the syntactic context, a binding has to be in the format | |
200 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
201 | * If anything else is detected in a place where a binding was expected, a | |
202 | * 'Bad binding' error is signalled. */ | |
203 | static const char s_bad_binding[] = "Bad binding"; | |
204 | ||
4610b011 DH |
205 | /* Some syntactic forms don't allow variable names to appear more than once in |
206 | * a list of bindings. If such a situation is nevertheless detected, a | |
207 | * 'Duplicate binding' error is signalled. */ | |
208 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
209 | ||
a954ce1d DH |
210 | /* If the exit form of a 'do' expression is not in the format |
211 | * (<test> <expression> ...) | |
212 | * a 'Bad exit clause' error is signalled. */ | |
213 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
214 | ||
03a3e941 DH |
215 | /* The formal function arguments of a lambda expression have to be either a |
216 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
217 | * error is signalled. */ | |
218 | static const char s_bad_formals[] = "Bad formals"; | |
219 | ||
220 | /* If in a lambda expression something else than a symbol is detected at a | |
221 | * place where a formal function argument is required, a 'Bad formal' error is | |
222 | * signalled. */ | |
223 | static const char s_bad_formal[] = "Bad formal"; | |
224 | ||
225 | /* If in the arguments list of a lambda expression an argument name occurs | |
226 | * more than once, a 'Duplicate formal' error is signalled. */ | |
227 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
228 | ||
6f81708a DH |
229 | /* If the evaluation of an unquote-splicing expression gives something else |
230 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
231 | * signalled. */ | |
232 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
233 | ||
9a848baf DH |
234 | /* If something else than an exact integer is detected as the argument for |
235 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
236 | static const char s_bad_slot_number[] = "Bad slot number"; | |
237 | ||
e6729603 DH |
238 | |
239 | /* Signal a syntax error. We distinguish between the form that caused the | |
240 | * error and the enclosing expression. The error message will print out as | |
241 | * shown in the following pattern. The file name and line number are only | |
242 | * given when they can be determined from the erroneous form or from the | |
243 | * enclosing expression. | |
244 | * | |
245 | * <filename>: In procedure memoization: | |
246 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
247 | ||
248 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
249 | ||
250 | /* The prototype is needed to indicate that the function does not return. */ | |
251 | static void | |
252 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
253 | ||
254 | static void | |
255 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
256 | { | |
cc95e00a | 257 | SCM msg_string = scm_from_locale_string (msg); |
e6729603 DH |
258 | SCM filename = SCM_BOOL_F; |
259 | SCM linenr = SCM_BOOL_F; | |
260 | const char *format; | |
261 | SCM args; | |
262 | ||
a61f4e0c | 263 | if (scm_is_pair (form)) |
e6729603 DH |
264 | { |
265 | filename = scm_source_property (form, scm_sym_filename); | |
266 | linenr = scm_source_property (form, scm_sym_line); | |
267 | } | |
268 | ||
a61f4e0c | 269 | if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr)) |
e6729603 DH |
270 | { |
271 | filename = scm_source_property (expr, scm_sym_filename); | |
272 | linenr = scm_source_property (expr, scm_sym_line); | |
273 | } | |
274 | ||
275 | if (!SCM_UNBNDP (expr)) | |
276 | { | |
7888309b | 277 | if (scm_is_true (filename)) |
e6729603 DH |
278 | { |
279 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
280 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
281 | } | |
7888309b | 282 | else if (scm_is_true (linenr)) |
e6729603 DH |
283 | { |
284 | format = "In line ~S: ~A ~S in expression ~S."; | |
285 | args = scm_list_4 (linenr, msg_string, form, expr); | |
286 | } | |
287 | else | |
288 | { | |
289 | format = "~A ~S in expression ~S."; | |
290 | args = scm_list_3 (msg_string, form, expr); | |
291 | } | |
292 | } | |
293 | else | |
294 | { | |
7888309b | 295 | if (scm_is_true (filename)) |
e6729603 DH |
296 | { |
297 | format = "In file ~S, line ~S: ~A ~S."; | |
298 | args = scm_list_4 (filename, linenr, msg_string, form); | |
299 | } | |
7888309b | 300 | else if (scm_is_true (linenr)) |
e6729603 DH |
301 | { |
302 | format = "In line ~S: ~A ~S."; | |
303 | args = scm_list_3 (linenr, msg_string, form); | |
304 | } | |
305 | else | |
306 | { | |
307 | format = "~A ~S."; | |
308 | args = scm_list_2 (msg_string, form); | |
309 | } | |
310 | } | |
311 | ||
312 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
313 | } | |
314 | ||
315 | ||
316 | /* Shortcut macros to simplify syntax error handling. */ | |
317 | #define ASSERT_SYNTAX(cond, message, form) \ | |
318 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
319 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
320 | { if (!(cond)) syntax_error (message, form, expr); } | |
321 | ||
322 | \f | |
323 | ||
d0624e39 DH |
324 | /* {Ilocs} |
325 | * | |
326 | * Ilocs are memoized references to variables in local environment frames. | |
327 | * They are represented as three values: The relative offset of the | |
328 | * environment frame, the number of the binding within that frame, and a | |
329 | * boolean value indicating whether the binding is the last binding in the | |
330 | * frame. | |
a55c2b68 MV |
331 | * |
332 | * Frame numbers have 11 bits, relative offsets have 12 bits. | |
d0624e39 | 333 | */ |
7e6e6b37 | 334 | |
d0624e39 | 335 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) |
7e6e6b37 DH |
336 | #define SCM_IFRINC (0x00000100L) |
337 | #define SCM_ICDR (0x00080000L) | |
d0624e39 | 338 | #define SCM_IDINC (0x00100000L) |
7e6e6b37 DH |
339 | #define SCM_IFRAME(n) ((long)((SCM_ICDR-SCM_IFRINC)>>8) \ |
340 | & (SCM_UNPACK (n) >> 8)) | |
341 | #define SCM_IDIST(n) (SCM_UNPACK (n) >> 20) | |
342 | #define SCM_ICDRP(n) (SCM_ICDR & SCM_UNPACK (n)) | |
d0624e39 | 343 | #define SCM_IDSTMSK (-SCM_IDINC) |
a55c2b68 MV |
344 | #define SCM_IFRAMEMAX ((1<<11)-1) |
345 | #define SCM_IDISTMAX ((1<<12)-1) | |
d0624e39 DH |
346 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ |
347 | SCM_PACK ( \ | |
348 | ((frame_nr) << 8) \ | |
349 | + ((binding_nr) << 20) \ | |
350 | + ((last_p) ? SCM_ICDR : 0) \ | |
351 | + scm_tc8_iloc ) | |
352 | ||
7e6e6b37 DH |
353 | void |
354 | scm_i_print_iloc (SCM iloc, SCM port) | |
355 | { | |
356 | scm_puts ("#@", port); | |
357 | scm_intprint ((long) SCM_IFRAME (iloc), 10, port); | |
358 | scm_putc (SCM_ICDRP (iloc) ? '-' : '+', port); | |
359 | scm_intprint ((long) SCM_IDIST (iloc), 10, port); | |
360 | } | |
361 | ||
d0624e39 DH |
362 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) |
363 | ||
364 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
90df793f | 365 | |
d0624e39 DH |
366 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, |
367 | (SCM frame, SCM binding, SCM cdrp), | |
368 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
369 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
370 | #define FUNC_NAME s_scm_dbg_make_iloc | |
371 | { | |
a55c2b68 MV |
372 | return SCM_MAKE_ILOC (scm_to_unsigned_integer (frame, 0, SCM_IFRAME_MAX), |
373 | scm_to_unsigned_integer (binding, 0, SCM_IDIST_MAX), | |
7888309b | 374 | scm_is_true (cdrp)); |
d0624e39 DH |
375 | } |
376 | #undef FUNC_NAME | |
377 | ||
378 | SCM scm_dbg_iloc_p (SCM obj); | |
90df793f | 379 | |
d0624e39 DH |
380 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, |
381 | (SCM obj), | |
382 | "Return @code{#t} if @var{obj} is an iloc.") | |
383 | #define FUNC_NAME s_scm_dbg_iloc_p | |
384 | { | |
7888309b | 385 | return scm_from_bool (SCM_ILOCP (obj)); |
d0624e39 DH |
386 | } |
387 | #undef FUNC_NAME | |
388 | ||
389 | #endif | |
390 | ||
391 | \f | |
392 | ||
7e6e6b37 DH |
393 | /* {Evaluator byte codes (isyms)} |
394 | */ | |
395 | ||
396 | #define ISYMNUM(n) (SCM_ITAG8_DATA (n)) | |
397 | ||
398 | /* This table must agree with the list of SCM_IM_ constants in tags.h */ | |
399 | static const char *const isymnames[] = | |
400 | { | |
401 | "#@and", | |
402 | "#@begin", | |
403 | "#@case", | |
404 | "#@cond", | |
405 | "#@do", | |
406 | "#@if", | |
407 | "#@lambda", | |
408 | "#@let", | |
409 | "#@let*", | |
410 | "#@letrec", | |
411 | "#@or", | |
412 | "#@quote", | |
413 | "#@set!", | |
414 | "#@define", | |
415 | "#@apply", | |
416 | "#@call-with-current-continuation", | |
417 | "#@dispatch", | |
418 | "#@slot-ref", | |
419 | "#@slot-set!", | |
420 | "#@delay", | |
421 | "#@future", | |
422 | "#@call-with-values", | |
423 | "#@else", | |
424 | "#@arrow", | |
425 | "#@nil-cond", | |
426 | "#@bind" | |
427 | }; | |
428 | ||
429 | void | |
430 | scm_i_print_isym (SCM isym, SCM port) | |
431 | { | |
432 | const size_t isymnum = ISYMNUM (isym); | |
433 | if (isymnum < (sizeof isymnames / sizeof (char *))) | |
434 | scm_puts (isymnames[isymnum], port); | |
435 | else | |
436 | scm_ipruk ("isym", isym, port); | |
437 | } | |
438 | ||
439 | \f | |
440 | ||
e5156567 DH |
441 | /* The function lookup_symbol is used during memoization: Lookup the symbol in |
442 | * the environment. If there is no binding for the symbol, SCM_UNDEFINED is | |
57d23e25 DH |
443 | * returned. If the symbol is a global variable, the variable object to which |
444 | * the symbol is bound is returned. Finally, if the symbol is a local | |
445 | * variable the corresponding iloc object is returned. */ | |
6f81708a DH |
446 | |
447 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
448 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
57d23e25 DH |
449 | * is unbound and it returns a variable object if the symbol is a global |
450 | * variable. */ | |
6f81708a DH |
451 | static SCM |
452 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
453 | { | |
454 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
7888309b | 455 | if (scm_is_false (variable)) |
57d23e25 | 456 | return SCM_UNDEFINED; |
6f81708a | 457 | else |
57d23e25 | 458 | return variable; |
6f81708a DH |
459 | } |
460 | ||
461 | static SCM | |
462 | lookup_symbol (const SCM symbol, const SCM env) | |
463 | { | |
464 | SCM frame_idx; | |
465 | unsigned int frame_nr; | |
466 | ||
467 | for (frame_idx = env, frame_nr = 0; | |
a61f4e0c | 468 | !scm_is_null (frame_idx); |
6f81708a DH |
469 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) |
470 | { | |
471 | const SCM frame = SCM_CAR (frame_idx); | |
a61f4e0c | 472 | if (scm_is_pair (frame)) |
6f81708a DH |
473 | { |
474 | /* frame holds a local environment frame */ | |
475 | SCM symbol_idx; | |
476 | unsigned int symbol_nr; | |
477 | ||
478 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
a61f4e0c | 479 | scm_is_pair (symbol_idx); |
6f81708a DH |
480 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) |
481 | { | |
bc36d050 | 482 | if (scm_is_eq (SCM_CAR (symbol_idx), symbol)) |
6f81708a DH |
483 | /* found the symbol, therefore return the iloc */ |
484 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
485 | } | |
bc36d050 | 486 | if (scm_is_eq (symbol_idx, symbol)) |
6f81708a DH |
487 | /* found the symbol as the last element of the current frame */ |
488 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
489 | } | |
490 | else | |
491 | { | |
492 | /* no more local environment frames */ | |
493 | return lookup_global_symbol (symbol, frame); | |
494 | } | |
495 | } | |
496 | ||
497 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
498 | } | |
499 | ||
500 | ||
501 | /* Return true if the symbol is - from the point of view of a macro | |
502 | * transformer - a literal in the sense specified in chapter "pattern | |
503 | * language" of R5RS. In the code below, however, we don't match the | |
504 | * definition of R5RS exactly: It returns true if the identifier has no | |
505 | * binding or if it is a syntactic keyword. */ | |
506 | static int | |
507 | literal_p (const SCM symbol, const SCM env) | |
508 | { | |
57d23e25 DH |
509 | const SCM variable = lookup_symbol (symbol, env); |
510 | if (SCM_UNBNDP (variable)) | |
511 | return 1; | |
512 | if (SCM_VARIABLEP (variable) && SCM_MACROP (SCM_VARIABLE_REF (variable))) | |
6f81708a DH |
513 | return 1; |
514 | else | |
515 | return 0; | |
516 | } | |
17fa3fcf | 517 | |
5fb64383 DH |
518 | |
519 | /* Return true if the expression is self-quoting in the memoized code. Thus, | |
520 | * some other objects (like e. g. vectors) are reported as self-quoting, which | |
521 | * according to R5RS would need to be quoted. */ | |
522 | static int | |
523 | is_self_quoting_p (const SCM expr) | |
524 | { | |
a61f4e0c | 525 | if (scm_is_pair (expr)) |
5fb64383 | 526 | return 0; |
cc95e00a | 527 | else if (scm_is_symbol (expr)) |
5fb64383 | 528 | return 0; |
a61f4e0c | 529 | else if (scm_is_null (expr)) |
5fb64383 DH |
530 | return 0; |
531 | else return 1; | |
532 | } | |
533 | ||
0f2d19dd | 534 | |
212e58ed DH |
535 | SCM_SYMBOL (sym_three_question_marks, "???"); |
536 | ||
537 | static SCM | |
538 | unmemoize_expression (const SCM expr, const SCM env) | |
539 | { | |
540 | if (SCM_ILOCP (expr)) | |
541 | { | |
542 | SCM frame_idx; | |
543 | unsigned long int frame_nr; | |
544 | SCM symbol_idx; | |
545 | unsigned long int symbol_nr; | |
546 | ||
547 | for (frame_idx = env, frame_nr = SCM_IFRAME (expr); | |
548 | frame_nr != 0; | |
549 | frame_idx = SCM_CDR (frame_idx), --frame_nr) | |
550 | ; | |
551 | for (symbol_idx = SCM_CAAR (frame_idx), symbol_nr = SCM_IDIST (expr); | |
552 | symbol_nr != 0; | |
553 | symbol_idx = SCM_CDR (symbol_idx), --symbol_nr) | |
554 | ; | |
555 | return SCM_ICDRP (expr) ? symbol_idx : SCM_CAR (symbol_idx); | |
556 | } | |
557 | else if (SCM_VARIABLEP (expr)) | |
558 | { | |
559 | const SCM sym = scm_module_reverse_lookup (scm_env_module (env), expr); | |
7888309b | 560 | return scm_is_true (sym) ? sym : sym_three_question_marks; |
212e58ed | 561 | } |
4057a3e0 | 562 | else if (scm_is_simple_vector (expr)) |
212e58ed DH |
563 | { |
564 | return scm_list_2 (scm_sym_quote, expr); | |
565 | } | |
a61f4e0c | 566 | else if (!scm_is_pair (expr)) |
212e58ed DH |
567 | { |
568 | return expr; | |
569 | } | |
570 | else if (SCM_ISYMP (SCM_CAR (expr))) | |
571 | { | |
572 | return unmemoize_builtin_macro (expr, env); | |
573 | } | |
574 | else | |
575 | { | |
576 | return unmemoize_exprs (expr, env); | |
577 | } | |
578 | } | |
579 | ||
580 | ||
581 | static SCM | |
582 | unmemoize_exprs (const SCM exprs, const SCM env) | |
583 | { | |
90df793f | 584 | SCM r_result = SCM_EOL; |
9fcf3cbb | 585 | SCM expr_idx = exprs; |
90df793f DH |
586 | SCM um_expr; |
587 | ||
588 | /* Note that due to the current lazy memoizer we may find partially memoized | |
5fa0939c | 589 | * code during execution. In such code we have to expect improper lists of |
90df793f DH |
590 | * expressions: On the one hand, for such code syntax checks have not yet |
591 | * fully been performed, on the other hand, there may be even legal code | |
592 | * like '(a . b) appear as an improper list of expressions as long as the | |
593 | * quote expression is still in its unmemoized form. For this reason, the | |
594 | * following code handles improper lists of expressions until memoization | |
595 | * and execution have been completely separated. */ | |
a61f4e0c | 596 | for (; scm_is_pair (expr_idx); expr_idx = SCM_CDR (expr_idx)) |
212e58ed DH |
597 | { |
598 | const SCM expr = SCM_CAR (expr_idx); | |
5fa0939c DH |
599 | |
600 | /* In partially memoized code, lists of expressions that stem from a | |
601 | * body form may start with an ISYM if the body itself has not yet been | |
602 | * memoized. This isym is just an internal marker to indicate that the | |
603 | * body still needs to be memoized. An isym may occur at the very | |
604 | * beginning of the body or after one or more comment strings. It is | |
605 | * dropped during unmemoization. */ | |
606 | if (!SCM_ISYMP (expr)) | |
607 | { | |
608 | um_expr = unmemoize_expression (expr, env); | |
609 | r_result = scm_cons (um_expr, r_result); | |
610 | } | |
90df793f DH |
611 | } |
612 | um_expr = unmemoize_expression (expr_idx, env); | |
a61f4e0c | 613 | if (!scm_is_null (r_result)) |
90df793f DH |
614 | { |
615 | const SCM result = scm_reverse_x (r_result, SCM_UNDEFINED); | |
616 | SCM_SETCDR (r_result, um_expr); | |
617 | return result; | |
618 | } | |
619 | else | |
620 | { | |
621 | return um_expr; | |
212e58ed | 622 | } |
212e58ed DH |
623 | } |
624 | ||
625 | ||
34adf7ea DH |
626 | /* Rewrite the body (which is given as the list of expressions forming the |
627 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
628 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
629 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
630 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 631 | * SCM_IM_LET, etc. |
34adf7ea DH |
632 | * |
633 | * It is assumed that the calling expression has already made sure that the | |
634 | * body is a proper list. */ | |
26d5b9b4 | 635 | static SCM |
430b8401 | 636 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 637 | { |
26d5b9b4 | 638 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
639 | if (SCM_ISYMP (SCM_CAR (exprs))) |
640 | return exprs; | |
641 | else | |
642 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
643 | } |
644 | ||
1cc91f1b | 645 | |
57d23e25 DH |
646 | /* The function m_expand_body memoizes a proper list of expressions forming a |
647 | * body. This function takes care of dealing with internal defines and | |
648 | * transforming them into an equivalent letrec expression. The list of | |
649 | * expressions is rewritten in place. */ | |
910b5125 | 650 | |
57d23e25 DH |
651 | /* This is a helper function for m_expand_body. If the argument expression is |
652 | * a symbol that denotes a syntactic keyword, the corresponding macro object | |
653 | * is returned, in all other cases the function returns SCM_UNDEFINED. */ | |
910b5125 DH |
654 | static SCM |
655 | try_macro_lookup (const SCM expr, const SCM env) | |
656 | { | |
cc95e00a | 657 | if (scm_is_symbol (expr)) |
910b5125 | 658 | { |
57d23e25 DH |
659 | const SCM variable = lookup_symbol (expr, env); |
660 | if (SCM_VARIABLEP (variable)) | |
661 | { | |
662 | const SCM value = SCM_VARIABLE_REF (variable); | |
663 | if (SCM_MACROP (value)) | |
664 | return value; | |
665 | } | |
910b5125 | 666 | } |
57d23e25 DH |
667 | |
668 | return SCM_UNDEFINED; | |
910b5125 DH |
669 | } |
670 | ||
671 | /* This is a helper function for m_expand_body. It expands user macros, | |
672 | * because for the correct translation of a body we need to know whether they | |
673 | * expand to a definition. */ | |
674 | static SCM | |
675 | expand_user_macros (SCM expr, const SCM env) | |
676 | { | |
a61f4e0c | 677 | while (scm_is_pair (expr)) |
910b5125 DH |
678 | { |
679 | const SCM car_expr = SCM_CAR (expr); | |
680 | const SCM new_car = expand_user_macros (car_expr, env); | |
681 | const SCM value = try_macro_lookup (new_car, env); | |
682 | ||
683 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
684 | { | |
685 | /* User macros transform code into code. */ | |
686 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
687 | /* We need to reiterate on the transformed code. */ | |
688 | } | |
689 | else | |
690 | { | |
691 | /* No user macro: return. */ | |
692 | SCM_SETCAR (expr, new_car); | |
693 | return expr; | |
694 | } | |
695 | } | |
696 | ||
697 | return expr; | |
698 | } | |
699 | ||
700 | /* This is a helper function for m_expand_body. It determines if a given form | |
701 | * represents an application of a given built-in macro. The built-in macro to | |
702 | * check for is identified by its syntactic keyword. The form is an | |
703 | * application of the given macro if looking up the car of the form in the | |
704 | * given environment actually returns the built-in macro. */ | |
705 | static int | |
706 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
707 | { | |
a61f4e0c | 708 | if (scm_is_pair (form)) |
910b5125 DH |
709 | { |
710 | const SCM car_form = SCM_CAR (form); | |
711 | const SCM value = try_macro_lookup (car_form, env); | |
712 | if (SCM_BUILTIN_MACRO_P (value)) | |
713 | { | |
714 | const SCM macro_name = scm_macro_name (value); | |
bc36d050 | 715 | return scm_is_eq (macro_name, syntactic_keyword); |
910b5125 DH |
716 | } |
717 | } | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
9d4bf6d3 | 722 | static void |
910b5125 DH |
723 | m_expand_body (const SCM forms, const SCM env) |
724 | { | |
725 | /* The first body form can be skipped since it is known to be the ISYM that | |
726 | * was prepended to the body by m_body. */ | |
727 | SCM cdr_forms = SCM_CDR (forms); | |
728 | SCM form_idx = cdr_forms; | |
729 | SCM definitions = SCM_EOL; | |
730 | SCM sequence = SCM_EOL; | |
731 | ||
732 | /* According to R5RS, the list of body forms consists of two parts: a number | |
733 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
734 | * expressions. Each the definitions and the expressions may be grouped | |
735 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
736 | * expressions. The task of the following loop therefore is to split the | |
737 | * list of body forms into the list of definitions and the sequence of | |
738 | * expressions. */ | |
a61f4e0c | 739 | while (!scm_is_null (form_idx)) |
910b5125 DH |
740 | { |
741 | const SCM form = SCM_CAR (form_idx); | |
742 | const SCM new_form = expand_user_macros (form, env); | |
743 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
744 | { | |
745 | definitions = scm_cons (new_form, definitions); | |
746 | form_idx = SCM_CDR (form_idx); | |
747 | } | |
748 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
749 | { | |
750 | /* We have encountered a group of forms. This has to be either a | |
751 | * (possibly empty) group of (possibly further grouped) definitions, | |
752 | * or a non-empty group of (possibly further grouped) | |
753 | * expressions. */ | |
754 | const SCM grouped_forms = SCM_CDR (new_form); | |
755 | unsigned int found_definition = 0; | |
756 | unsigned int found_expression = 0; | |
757 | SCM grouped_form_idx = grouped_forms; | |
a61f4e0c | 758 | while (!found_expression && !scm_is_null (grouped_form_idx)) |
910b5125 DH |
759 | { |
760 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
761 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
762 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
763 | { | |
764 | found_definition = 1; | |
765 | definitions = scm_cons (new_inner_form, definitions); | |
766 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
767 | } | |
768 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
769 | { | |
770 | const SCM inner_group = SCM_CDR (new_inner_form); | |
771 | grouped_form_idx | |
772 | = scm_append (scm_list_2 (inner_group, | |
773 | SCM_CDR (grouped_form_idx))); | |
774 | } | |
775 | else | |
776 | { | |
777 | /* The group marks the start of the expressions of the body. | |
778 | * We have to make sure that within the same group we have | |
779 | * not encountered a definition before. */ | |
780 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
781 | found_expression = 1; | |
782 | grouped_form_idx = SCM_EOL; | |
783 | } | |
784 | } | |
785 | ||
786 | /* We have finished processing the group. If we have not yet | |
787 | * encountered an expression we continue processing the forms of the | |
788 | * body to collect further definition forms. Otherwise, the group | |
789 | * marks the start of the sequence of expressions of the body. */ | |
790 | if (!found_expression) | |
791 | { | |
792 | form_idx = SCM_CDR (form_idx); | |
793 | } | |
794 | else | |
795 | { | |
796 | sequence = form_idx; | |
797 | form_idx = SCM_EOL; | |
798 | } | |
799 | } | |
800 | else | |
801 | { | |
802 | /* We have detected a form which is no definition. This marks the | |
803 | * start of the sequence of expressions of the body. */ | |
804 | sequence = form_idx; | |
805 | form_idx = SCM_EOL; | |
806 | } | |
807 | } | |
808 | ||
809 | /* FIXME: forms does not hold information about the file location. */ | |
a61f4e0c | 810 | ASSERT_SYNTAX (scm_is_pair (sequence), s_missing_body_expression, cdr_forms); |
910b5125 | 811 | |
a61f4e0c | 812 | if (!scm_is_null (definitions)) |
910b5125 DH |
813 | { |
814 | SCM definition_idx; | |
815 | SCM letrec_tail; | |
816 | SCM letrec_expression; | |
817 | SCM new_letrec_expression; | |
910b5125 DH |
818 | |
819 | SCM bindings = SCM_EOL; | |
820 | for (definition_idx = definitions; | |
a61f4e0c | 821 | !scm_is_null (definition_idx); |
910b5125 DH |
822 | definition_idx = SCM_CDR (definition_idx)) |
823 | { | |
824 | const SCM definition = SCM_CAR (definition_idx); | |
825 | const SCM canonical_definition = canonicalize_define (definition); | |
826 | const SCM binding = SCM_CDR (canonical_definition); | |
827 | bindings = scm_cons (binding, bindings); | |
828 | }; | |
829 | ||
830 | letrec_tail = scm_cons (bindings, sequence); | |
831 | /* FIXME: forms does not hold information about the file location. */ | |
832 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
833 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
834 | SCM_SETCAR (forms, new_letrec_expression); |
835 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
836 | } |
837 | else | |
838 | { | |
839 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
840 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
841 | } |
842 | } | |
843 | ||
2b189e65 MV |
844 | static SCM |
845 | macroexp (SCM x, SCM env) | |
846 | { | |
847 | SCM res, proc, orig_sym; | |
848 | ||
849 | /* Don't bother to produce error messages here. We get them when we | |
850 | eventually execute the code for real. */ | |
851 | ||
852 | macro_tail: | |
853 | orig_sym = SCM_CAR (x); | |
cc95e00a | 854 | if (!scm_is_symbol (orig_sym)) |
2b189e65 MV |
855 | return x; |
856 | ||
857 | { | |
858 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
859 | if (proc_ptr == NULL) | |
860 | { | |
861 | /* We have lost the race. */ | |
862 | goto macro_tail; | |
863 | } | |
864 | proc = *proc_ptr; | |
865 | } | |
866 | ||
867 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
868 | special forms and should not be evaluated here. */ | |
869 | ||
870 | if (!SCM_MACROP (proc) | |
871 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
872 | return x; | |
873 | ||
874 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ | |
875 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); | |
876 | ||
877 | if (scm_ilength (res) <= 0) | |
878 | res = scm_list_2 (SCM_IM_BEGIN, res); | |
879 | ||
880 | SCM_DEFER_INTS; | |
881 | SCM_SETCAR (x, SCM_CAR (res)); | |
882 | SCM_SETCDR (x, SCM_CDR (res)); | |
883 | SCM_ALLOW_INTS; | |
884 | ||
885 | goto macro_tail; | |
886 | } | |
910b5125 | 887 | |
9fbee57e | 888 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
889 | |
890 | ||
3b88ed2a | 891 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 892 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 893 | |
8ea46249 | 894 | SCM |
e6729603 | 895 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 896 | { |
e6729603 DH |
897 | const SCM cdr_expr = SCM_CDR (expr); |
898 | const long length = scm_ilength (cdr_expr); | |
899 | ||
900 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
901 | ||
902 | if (length == 0) | |
903 | { | |
904 | /* Special case: (and) is replaced by #t. */ | |
905 | return SCM_BOOL_T; | |
906 | } | |
0f2d19dd | 907 | else |
e6729603 DH |
908 | { |
909 | SCM_SETCAR (expr, SCM_IM_AND); | |
910 | return expr; | |
911 | } | |
0f2d19dd JB |
912 | } |
913 | ||
212e58ed DH |
914 | static SCM |
915 | unmemoize_and (const SCM expr, const SCM env) | |
916 | { | |
917 | return scm_cons (scm_sym_and, unmemoize_exprs (SCM_CDR (expr), env)); | |
918 | } | |
919 | ||
1cc91f1b | 920 | |
3b88ed2a | 921 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 922 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
923 | |
924 | SCM | |
2a6f7afe | 925 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 926 | { |
2a6f7afe | 927 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
928 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
929 | * That means, there should be a distinction between uses of begin where an | |
930 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
931 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
932 | ||
933 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
934 | return expr; | |
0f2d19dd JB |
935 | } |
936 | ||
212e58ed DH |
937 | static SCM |
938 | unmemoize_begin (const SCM expr, const SCM env) | |
939 | { | |
940 | return scm_cons (scm_sym_begin, unmemoize_exprs (SCM_CDR (expr), env)); | |
941 | } | |
942 | ||
0f2d19dd | 943 | |
3b88ed2a | 944 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 945 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 946 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 947 | |
8ea46249 | 948 | SCM |
2a6f7afe | 949 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 950 | { |
8ea46249 | 951 | SCM clauses; |
2a6f7afe DH |
952 | SCM all_labels = SCM_EOL; |
953 | ||
954 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
955 | const int else_literal_p = literal_p (scm_sym_else, env); | |
956 | ||
957 | const SCM cdr_expr = SCM_CDR (expr); | |
958 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
959 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
960 | ||
961 | clauses = SCM_CDR (cdr_expr); | |
a61f4e0c | 962 | while (!scm_is_null (clauses)) |
0f2d19dd | 963 | { |
2a6f7afe DH |
964 | SCM labels; |
965 | ||
966 | const SCM clause = SCM_CAR (clauses); | |
967 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
968 | s_bad_case_clause, clause, expr); | |
969 | ||
970 | labels = SCM_CAR (clause); | |
a61f4e0c | 971 | if (scm_is_pair (labels)) |
2a6f7afe DH |
972 | { |
973 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
974 | s_bad_case_labels, labels, expr); | |
26ecfa39 | 975 | all_labels = scm_append (scm_list_2 (labels, all_labels)); |
2a6f7afe | 976 | } |
a61f4e0c | 977 | else if (scm_is_null (labels)) |
58a2510b DH |
978 | { |
979 | /* The list of labels is empty. According to R5RS this is allowed. | |
980 | * It means that the sequence of expressions will never be executed. | |
981 | * Therefore, as an optimization, we could remove the whole | |
982 | * clause. */ | |
983 | } | |
2a6f7afe DH |
984 | else |
985 | { | |
bc36d050 | 986 | ASSERT_SYNTAX_2 (scm_is_eq (labels, scm_sym_else) && else_literal_p, |
2a6f7afe | 987 | s_bad_case_labels, labels, expr); |
a61f4e0c | 988 | ASSERT_SYNTAX_2 (scm_is_null (SCM_CDR (clauses)), |
609a8b86 | 989 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
990 | } |
991 | ||
992 | /* build the new clause */ | |
bc36d050 | 993 | if (scm_is_eq (labels, scm_sym_else)) |
2a6f7afe DH |
994 | SCM_SETCAR (clause, SCM_IM_ELSE); |
995 | ||
8ea46249 | 996 | clauses = SCM_CDR (clauses); |
0f2d19dd | 997 | } |
2a6f7afe DH |
998 | |
999 | /* Check whether all case labels are distinct. */ | |
a61f4e0c | 1000 | for (; !scm_is_null (all_labels); all_labels = SCM_CDR (all_labels)) |
2a6f7afe DH |
1001 | { |
1002 | const SCM label = SCM_CAR (all_labels); | |
7888309b | 1003 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (label, SCM_CDR (all_labels))), |
4610b011 | 1004 | s_duplicate_case_label, label, expr); |
2a6f7afe DH |
1005 | } |
1006 | ||
1007 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1008 | return expr; | |
0f2d19dd JB |
1009 | } |
1010 | ||
212e58ed DH |
1011 | static SCM |
1012 | unmemoize_case (const SCM expr, const SCM env) | |
1013 | { | |
1014 | const SCM um_key_expr = unmemoize_expression (SCM_CADR (expr), env); | |
1015 | SCM um_clauses = SCM_EOL; | |
1016 | SCM clause_idx; | |
1017 | ||
1018 | for (clause_idx = SCM_CDDR (expr); | |
a61f4e0c | 1019 | !scm_is_null (clause_idx); |
212e58ed DH |
1020 | clause_idx = SCM_CDR (clause_idx)) |
1021 | { | |
1022 | const SCM clause = SCM_CAR (clause_idx); | |
1023 | const SCM labels = SCM_CAR (clause); | |
1024 | const SCM exprs = SCM_CDR (clause); | |
1025 | ||
1026 | const SCM um_exprs = unmemoize_exprs (exprs, env); | |
bc36d050 | 1027 | const SCM um_labels = (scm_is_eq (labels, SCM_IM_ELSE)) |
212e58ed DH |
1028 | ? scm_sym_else |
1029 | : scm_i_finite_list_copy (labels); | |
1030 | const SCM um_clause = scm_cons (um_labels, um_exprs); | |
1031 | ||
1032 | um_clauses = scm_cons (um_clause, um_clauses); | |
1033 | } | |
1034 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1035 | ||
1036 | return scm_cons2 (scm_sym_case, um_key_expr, um_clauses); | |
1037 | } | |
1038 | ||
0f2d19dd | 1039 | |
3b88ed2a | 1040 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1041 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1042 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1043 | |
8ea46249 | 1044 | SCM |
609a8b86 | 1045 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1046 | { |
609a8b86 DH |
1047 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1048 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1049 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1050 | ||
1051 | const SCM clauses = SCM_CDR (expr); | |
1052 | SCM clause_idx; | |
1053 | ||
1054 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1055 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1056 | ||
1057 | for (clause_idx = clauses; | |
a61f4e0c | 1058 | !scm_is_null (clause_idx); |
609a8b86 | 1059 | clause_idx = SCM_CDR (clause_idx)) |
0f2d19dd | 1060 | { |
609a8b86 DH |
1061 | SCM test; |
1062 | ||
1063 | const SCM clause = SCM_CAR (clause_idx); | |
1064 | const long length = scm_ilength (clause); | |
1065 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1066 | ||
1067 | test = SCM_CAR (clause); | |
bc36d050 | 1068 | if (scm_is_eq (test, scm_sym_else) && else_literal_p) |
0f2d19dd | 1069 | { |
a61f4e0c | 1070 | const int last_clause_p = scm_is_null (SCM_CDR (clause_idx)); |
609a8b86 DH |
1071 | ASSERT_SYNTAX_2 (length >= 2, |
1072 | s_bad_cond_clause, clause, expr); | |
1073 | ASSERT_SYNTAX_2 (last_clause_p, | |
1074 | s_misplaced_else_clause, clause, expr); | |
1075 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1076 | } |
609a8b86 | 1077 | else if (length >= 2 |
bc36d050 | 1078 | && scm_is_eq (SCM_CADR (clause), scm_sym_arrow) |
609a8b86 DH |
1079 | && arrow_literal_p) |
1080 | { | |
1081 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1082 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1083 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1084 | } |
0f2d19dd | 1085 | } |
609a8b86 DH |
1086 | |
1087 | SCM_SETCAR (expr, SCM_IM_COND); | |
1088 | return expr; | |
0f2d19dd JB |
1089 | } |
1090 | ||
212e58ed DH |
1091 | static SCM |
1092 | unmemoize_cond (const SCM expr, const SCM env) | |
1093 | { | |
1094 | SCM um_clauses = SCM_EOL; | |
1095 | SCM clause_idx; | |
1096 | ||
1097 | for (clause_idx = SCM_CDR (expr); | |
a61f4e0c | 1098 | !scm_is_null (clause_idx); |
212e58ed DH |
1099 | clause_idx = SCM_CDR (clause_idx)) |
1100 | { | |
1101 | const SCM clause = SCM_CAR (clause_idx); | |
1102 | const SCM sequence = SCM_CDR (clause); | |
1103 | const SCM test = SCM_CAR (clause); | |
1104 | SCM um_test; | |
1105 | SCM um_sequence; | |
1106 | SCM um_clause; | |
1107 | ||
bc36d050 | 1108 | if (scm_is_eq (test, SCM_IM_ELSE)) |
212e58ed DH |
1109 | um_test = scm_sym_else; |
1110 | else | |
1111 | um_test = unmemoize_expression (test, env); | |
1112 | ||
a61f4e0c | 1113 | if (!scm_is_null (sequence) && scm_is_eq (SCM_CAR (sequence), |
bc36d050 | 1114 | SCM_IM_ARROW)) |
212e58ed DH |
1115 | { |
1116 | const SCM target = SCM_CADR (sequence); | |
1117 | const SCM um_target = unmemoize_expression (target, env); | |
1118 | um_sequence = scm_list_2 (scm_sym_arrow, um_target); | |
1119 | } | |
1120 | else | |
1121 | { | |
1122 | um_sequence = unmemoize_exprs (sequence, env); | |
1123 | } | |
1124 | ||
1125 | um_clause = scm_cons (um_test, um_sequence); | |
1126 | um_clauses = scm_cons (um_clause, um_clauses); | |
1127 | } | |
1128 | um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED); | |
1129 | ||
1130 | return scm_cons (scm_sym_cond, um_clauses); | |
1131 | } | |
1132 | ||
1cc91f1b | 1133 | |
0f572ba7 DH |
1134 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1135 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1136 | |
9fbee57e DH |
1137 | /* Guile provides an extension to R5RS' define syntax to represent function |
1138 | * currying in a compact way. With this extension, it is allowed to write | |
1139 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1140 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1141 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1142 | * should be either a sequence of zero or more variables, or a sequence of one | |
1143 | * or more variables followed by a space-delimited period and another | |
1144 | * variable. Each level of argument nesting wraps the <body> within another | |
1145 | * lambda expression. For example, the following forms are allowed, each one | |
1146 | * followed by an equivalent, more explicit implementation. | |
1147 | * Example 1: | |
1148 | * (define ((a b . c) . d) <body>) is equivalent to | |
1149 | * (define a (lambda (b . c) (lambda d <body>))) | |
1150 | * Example 2: | |
1151 | * (define (((a) b) c . d) <body>) is equivalent to | |
1152 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1153 | */ | |
1154 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1155 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1156 | static SCM |
1157 | canonicalize_define (const SCM expr) | |
5280aaca | 1158 | { |
cc56ba80 DH |
1159 | SCM body; |
1160 | SCM variable; | |
1161 | ||
1162 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1163 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1164 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1165 | ||
1166 | body = SCM_CDR (cdr_expr); | |
1167 | variable = SCM_CAR (cdr_expr); | |
a61f4e0c | 1168 | while (scm_is_pair (variable)) |
5280aaca | 1169 | { |
cc56ba80 DH |
1170 | /* This while loop realizes function currying by variable nesting. |
1171 | * Variable is known to be a nested-variable. In every iteration of the | |
1172 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1173 | * innermost one. Note that we don't check for duplicate formals here: |
1174 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1175 | const SCM formals = SCM_CDR (variable); |
1176 | const SCM tail = scm_cons (formals, body); | |
1177 | ||
1178 | /* Add source properties to each new lambda expression: */ | |
1179 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1180 | ||
1181 | body = scm_list_1 (lambda); | |
1182 | variable = SCM_CAR (variable); | |
5280aaca | 1183 | } |
cc95e00a | 1184 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
cc56ba80 DH |
1185 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); |
1186 | ||
0f572ba7 DH |
1187 | SCM_SETCAR (cdr_expr, variable); |
1188 | SCM_SETCDR (cdr_expr, body); | |
1189 | return expr; | |
1190 | } | |
1191 | ||
36245b66 DH |
1192 | /* According to section 5.2.1 of R5RS we first have to make sure that the |
1193 | * variable is bound, and then perform the (set! variable expression) | |
1194 | * operation. This means, that within the expression we may already assign | |
1195 | * values to variable: (define foo (begin (set! foo 1) (+ foo 1))) */ | |
0f572ba7 DH |
1196 | SCM |
1197 | scm_m_define (SCM expr, SCM env) | |
1198 | { | |
6bff1368 | 1199 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 1200 | |
6bff1368 DH |
1201 | { |
1202 | const SCM canonical_definition = canonicalize_define (expr); | |
1203 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1204 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
36245b66 DH |
1205 | const SCM location |
1206 | = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); | |
1207 | const SCM value = scm_eval_car (SCM_CDR (cdr_canonical_definition), env); | |
6bff1368 | 1208 | |
6bff1368 DH |
1209 | if (SCM_REC_PROCNAMES_P) |
1210 | { | |
1211 | SCM tmp = value; | |
1212 | while (SCM_MACROP (tmp)) | |
1213 | tmp = SCM_MACRO_CODE (tmp); | |
1214 | if (SCM_CLOSUREP (tmp) | |
1215 | /* Only the first definition determines the name. */ | |
7888309b | 1216 | && scm_is_false (scm_procedure_property (tmp, scm_sym_name))) |
6bff1368 DH |
1217 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); |
1218 | } | |
0f572ba7 | 1219 | |
36245b66 | 1220 | SCM_VARIABLE_SET (location, value); |
6bff1368 DH |
1221 | |
1222 | return SCM_UNSPECIFIED; | |
1223 | } | |
0f2d19dd JB |
1224 | } |
1225 | ||
1226 | ||
8ae95199 DH |
1227 | /* This is a helper function for forms (<keyword> <expression>) that are |
1228 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1229 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1230 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1231 | static SCM | |
1232 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1233 | { | |
1234 | const SCM cdr_expr = SCM_CDR (expr); | |
1235 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1236 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1237 | ||
1238 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1239 | ||
1240 | return expr; | |
1241 | } | |
1242 | ||
1243 | ||
3b88ed2a | 1244 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1245 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1246 | |
9fbee57e DH |
1247 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1248 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1249 | * the empty list represents the empty parameter list. This representation | |
1250 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1251 | SCM |
8ae95199 | 1252 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1253 | { |
8ae95199 DH |
1254 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1255 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1256 | return new_expr; | |
0f2d19dd JB |
1257 | } |
1258 | ||
212e58ed DH |
1259 | static SCM |
1260 | unmemoize_delay (const SCM expr, const SCM env) | |
1261 | { | |
1262 | const SCM thunk_expr = SCM_CADDR (expr); | |
1263 | return scm_list_2 (scm_sym_delay, unmemoize_expression (thunk_expr, env)); | |
1264 | } | |
1265 | ||
8ea46249 | 1266 | |
a954ce1d DH |
1267 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1268 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1269 | ||
302c12b4 | 1270 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1271 | * reversed here. During the evaluation this allows for simple consing of the |
1272 | * results of the inits and steps: | |
302c12b4 | 1273 | |
0f2d19dd | 1274 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1275 | (<var2> <init2>) |
1276 | ... ) | |
1277 | (<test> <return>) | |
1278 | <body>) | |
302c12b4 | 1279 | |
0f2d19dd | 1280 | ;; becomes |
302c12b4 | 1281 | |
e681d187 | 1282 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1283 | (varn ... var2 var1) |
1284 | (<test> <return>) | |
1285 | (<body>) | |
1286 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1287 | */ |
0f2d19dd | 1288 | SCM |
a954ce1d | 1289 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1290 | { |
a954ce1d DH |
1291 | SCM variables = SCM_EOL; |
1292 | SCM init_forms = SCM_EOL; | |
1293 | SCM step_forms = SCM_EOL; | |
1294 | SCM binding_idx; | |
1295 | SCM cddr_expr; | |
1296 | SCM exit_clause; | |
1297 | SCM commands; | |
1298 | SCM tail; | |
1299 | ||
1300 | const SCM cdr_expr = SCM_CDR (expr); | |
1301 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1302 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1303 | ||
1304 | /* Collect variables, init and step forms. */ | |
1305 | binding_idx = SCM_CAR (cdr_expr); | |
1306 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1307 | s_bad_bindings, binding_idx, expr); | |
a61f4e0c | 1308 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1309 | { |
a954ce1d DH |
1310 | const SCM binding = SCM_CAR (binding_idx); |
1311 | const long length = scm_ilength (binding); | |
1312 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1313 | s_bad_binding, binding, expr); | |
1314 | ||
302c12b4 | 1315 | { |
a954ce1d DH |
1316 | const SCM name = SCM_CAR (binding); |
1317 | const SCM init = SCM_CADR (binding); | |
1318 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
cc95e00a | 1319 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
7888309b | 1320 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, variables)), |
4610b011 DH |
1321 | s_duplicate_binding, name, expr); |
1322 | ||
a954ce1d DH |
1323 | variables = scm_cons (name, variables); |
1324 | init_forms = scm_cons (init, init_forms); | |
1325 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1326 | } |
0f2d19dd | 1327 | } |
a954ce1d DH |
1328 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1329 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1330 | ||
1331 | /* Memoize the test form and the exit sequence. */ | |
1332 | cddr_expr = SCM_CDR (cdr_expr); | |
1333 | exit_clause = SCM_CAR (cddr_expr); | |
1334 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1335 | s_bad_exit_clause, exit_clause, expr); | |
1336 | ||
1337 | commands = SCM_CDR (cddr_expr); | |
1338 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1339 | tail = scm_cons2 (init_forms, variables, tail); | |
1340 | SCM_SETCAR (expr, SCM_IM_DO); | |
1341 | SCM_SETCDR (expr, tail); | |
1342 | return expr; | |
0f2d19dd JB |
1343 | } |
1344 | ||
212e58ed DH |
1345 | static SCM |
1346 | unmemoize_do (const SCM expr, const SCM env) | |
1347 | { | |
1348 | const SCM cdr_expr = SCM_CDR (expr); | |
1349 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1350 | const SCM rnames = SCM_CAR (cddr_expr); | |
1351 | const SCM extended_env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
1352 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1353 | const SCM exit_sequence = SCM_CAR (cdddr_expr); | |
1354 | const SCM um_exit_sequence = unmemoize_exprs (exit_sequence, extended_env); | |
1355 | const SCM cddddr_expr = SCM_CDR (cdddr_expr); | |
1356 | const SCM um_body = unmemoize_exprs (SCM_CAR (cddddr_expr), extended_env); | |
1357 | ||
1358 | /* build transformed binding list */ | |
1359 | SCM um_names = scm_reverse (rnames); | |
1360 | SCM um_inits = unmemoize_exprs (SCM_CAR (cdr_expr), env); | |
1361 | SCM um_steps = unmemoize_exprs (SCM_CDR (cddddr_expr), extended_env); | |
1362 | SCM um_bindings = SCM_EOL; | |
a61f4e0c | 1363 | while (!scm_is_null (um_names)) |
212e58ed DH |
1364 | { |
1365 | const SCM name = SCM_CAR (um_names); | |
1366 | const SCM init = SCM_CAR (um_inits); | |
1367 | SCM step = SCM_CAR (um_steps); | |
bc36d050 | 1368 | step = scm_is_eq (step, name) ? SCM_EOL : scm_list_1 (step); |
212e58ed DH |
1369 | |
1370 | um_bindings = scm_cons (scm_cons2 (name, init, step), um_bindings); | |
1371 | ||
1372 | um_names = SCM_CDR (um_names); | |
1373 | um_inits = SCM_CDR (um_inits); | |
1374 | um_steps = SCM_CDR (um_steps); | |
1375 | } | |
1376 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); | |
1377 | ||
1378 | return scm_cons (scm_sym_do, | |
1379 | scm_cons2 (um_bindings, um_exit_sequence, um_body)); | |
1380 | } | |
1381 | ||
b8229a3b | 1382 | |
3b88ed2a | 1383 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1384 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1385 | |
9fbee57e | 1386 | SCM |
4610b011 | 1387 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1388 | { |
4610b011 DH |
1389 | const SCM cdr_expr = SCM_CDR (expr); |
1390 | const long length = scm_ilength (cdr_expr); | |
1391 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1392 | SCM_SETCAR (expr, SCM_IM_IF); | |
1393 | return expr; | |
0f2d19dd JB |
1394 | } |
1395 | ||
212e58ed DH |
1396 | static SCM |
1397 | unmemoize_if (const SCM expr, const SCM env) | |
1398 | { | |
1399 | const SCM cdr_expr = SCM_CDR (expr); | |
1400 | const SCM um_condition = unmemoize_expression (SCM_CAR (cdr_expr), env); | |
1401 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1402 | const SCM um_then = unmemoize_expression (SCM_CAR (cddr_expr), env); | |
1403 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
1404 | ||
a61f4e0c | 1405 | if (scm_is_null (cdddr_expr)) |
212e58ed DH |
1406 | { |
1407 | return scm_list_3 (scm_sym_if, um_condition, um_then); | |
1408 | } | |
1409 | else | |
1410 | { | |
1411 | const SCM um_else = unmemoize_expression (SCM_CAR (cdddr_expr), env); | |
1412 | return scm_list_4 (scm_sym_if, um_condition, um_then, um_else); | |
1413 | } | |
1414 | } | |
1415 | ||
302c12b4 | 1416 | |
3b88ed2a | 1417 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1418 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1419 | |
4610b011 DH |
1420 | /* A helper function for memoize_lambda to support checking for duplicate |
1421 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1422 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1423 | * forms that a formal argument can have: | |
1424 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1425 | static int |
4610b011 | 1426 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1427 | { |
a61f4e0c | 1428 | for (; scm_is_pair (list); list = SCM_CDR (list)) |
9fbee57e | 1429 | { |
bc36d050 | 1430 | if (scm_is_eq (SCM_CAR (list), obj)) |
4610b011 | 1431 | return 1; |
9fbee57e | 1432 | } |
bc36d050 | 1433 | return scm_is_eq (list, obj); |
5cb22e96 DH |
1434 | } |
1435 | ||
28d52ebb | 1436 | SCM |
03a3e941 | 1437 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1438 | { |
9fbee57e | 1439 | SCM formals; |
03a3e941 | 1440 | SCM formals_idx; |
34adf7ea DH |
1441 | SCM cddr_expr; |
1442 | int documentation; | |
1443 | SCM body; | |
1444 | SCM new_body; | |
03a3e941 DH |
1445 | |
1446 | const SCM cdr_expr = SCM_CDR (expr); | |
1447 | const long length = scm_ilength (cdr_expr); | |
1448 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1449 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1450 | |
03a3e941 DH |
1451 | /* Before iterating the list of formal arguments, make sure the formals |
1452 | * actually are given as either a symbol or a non-cyclic list. */ | |
1453 | formals = SCM_CAR (cdr_expr); | |
a61f4e0c | 1454 | if (scm_is_pair (formals)) |
03a3e941 DH |
1455 | { |
1456 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1457 | * detected, report a 'Bad formals' error. */ | |
1458 | } | |
1459 | else | |
1460 | { | |
a61f4e0c | 1461 | ASSERT_SYNTAX_2 (scm_is_symbol (formals) || scm_is_null (formals), |
03a3e941 DH |
1462 | s_bad_formals, formals, expr); |
1463 | } | |
1cc91f1b | 1464 | |
03a3e941 DH |
1465 | /* Now iterate the list of formal arguments to check if all formals are |
1466 | * symbols, and that there are no duplicates. */ | |
1467 | formals_idx = formals; | |
a61f4e0c | 1468 | while (scm_is_pair (formals_idx)) |
0f2d19dd | 1469 | { |
03a3e941 DH |
1470 | const SCM formal = SCM_CAR (formals_idx); |
1471 | const SCM next_idx = SCM_CDR (formals_idx); | |
cc95e00a | 1472 | ASSERT_SYNTAX_2 (scm_is_symbol (formal), s_bad_formal, formal, expr); |
03a3e941 DH |
1473 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), |
1474 | s_duplicate_formal, formal, expr); | |
1475 | formals_idx = next_idx; | |
0f2d19dd | 1476 | } |
a61f4e0c | 1477 | ASSERT_SYNTAX_2 (scm_is_null (formals_idx) || scm_is_symbol (formals_idx), |
03a3e941 | 1478 | s_bad_formal, formals_idx, expr); |
9fbee57e | 1479 | |
34adf7ea DH |
1480 | /* Memoize the body. Keep a potential documentation string. */ |
1481 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1482 | * some external database. Otherwise it will slow down execution, since | |
1483 | * the documentation string will have to be skipped with every execution | |
1484 | * of the closure. */ | |
1485 | cddr_expr = SCM_CDR (cdr_expr); | |
7f9994d9 | 1486 | documentation = (length >= 3 && scm_is_string (SCM_CAR (cddr_expr))); |
34adf7ea | 1487 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; |
430b8401 | 1488 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1489 | |
1490 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1491 | if (documentation) | |
1492 | SCM_SETCDR (cddr_expr, new_body); | |
1493 | else | |
1494 | SCM_SETCDR (cdr_expr, new_body); | |
1495 | return expr; | |
0f2d19dd | 1496 | } |
6dbd0af5 | 1497 | |
212e58ed DH |
1498 | static SCM |
1499 | unmemoize_lambda (const SCM expr, const SCM env) | |
1500 | { | |
1501 | const SCM formals = SCM_CADR (expr); | |
1502 | const SCM body = SCM_CDDR (expr); | |
1503 | ||
1504 | const SCM new_env = SCM_EXTEND_ENV (formals, SCM_EOL, env); | |
1505 | const SCM um_formals = scm_i_finite_list_copy (formals); | |
1506 | const SCM um_body = unmemoize_exprs (body, new_env); | |
1507 | ||
1508 | return scm_cons2 (scm_sym_lambda, um_formals, um_body); | |
1509 | } | |
1510 | ||
0f2d19dd | 1511 | |
d6754c23 | 1512 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1513 | static void |
d6754c23 | 1514 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1515 | { |
d6754c23 | 1516 | SCM binding_idx; |
302c12b4 | 1517 | |
d6754c23 DH |
1518 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1519 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1520 | |
d6754c23 | 1521 | binding_idx = bindings; |
a61f4e0c | 1522 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
0f2d19dd | 1523 | { |
d6754c23 DH |
1524 | SCM name; /* const */ |
1525 | ||
1526 | const SCM binding = SCM_CAR (binding_idx); | |
1527 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1528 | s_bad_binding, binding, expr); | |
1529 | ||
1530 | name = SCM_CAR (binding); | |
cc95e00a | 1531 | ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr); |
0f2d19dd | 1532 | } |
d6754c23 | 1533 | } |
26d5b9b4 | 1534 | |
d6754c23 DH |
1535 | |
1536 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1537 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1538 | * variables are returned in a list with their order reversed, and the init | |
1539 | * forms are returned in a list in the same order as they are given in the | |
1540 | * bindings. If a duplicate variable name is detected, an error is | |
1541 | * signalled. */ | |
1542 | static void | |
1543 | transform_bindings ( | |
1544 | const SCM bindings, const SCM expr, | |
1545 | SCM *const rvarptr, SCM *const initptr ) | |
1546 | { | |
1547 | SCM rvariables = SCM_EOL; | |
1548 | SCM rinits = SCM_EOL; | |
1549 | SCM binding_idx = bindings; | |
a61f4e0c | 1550 | for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx)) |
d6754c23 DH |
1551 | { |
1552 | const SCM binding = SCM_CAR (binding_idx); | |
1553 | const SCM cdr_binding = SCM_CDR (binding); | |
1554 | const SCM name = SCM_CAR (binding); | |
7888309b | 1555 | ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rvariables)), |
d6754c23 DH |
1556 | s_duplicate_binding, name, expr); |
1557 | rvariables = scm_cons (name, rvariables); | |
1558 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1559 | } | |
1560 | *rvarptr = rvariables; | |
1561 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1562 | } |
1563 | ||
302c12b4 | 1564 | |
3b88ed2a | 1565 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1566 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1567 | |
d6754c23 DH |
1568 | /* This function is a helper function for memoize_let. It transforms |
1569 | * (let name ((var init) ...) body ...) into | |
1570 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1571 | * and memoizes the expression. It is assumed that the caller has checked | |
1572 | * that name is a symbol and that there are bindings and a body. */ | |
1573 | static SCM | |
1574 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1575 | { | |
1576 | SCM rvariables; | |
1577 | SCM variables; | |
1578 | SCM inits; | |
1579 | ||
1580 | const SCM cdr_expr = SCM_CDR (expr); | |
1581 | const SCM name = SCM_CAR (cdr_expr); | |
1582 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1583 | const SCM bindings = SCM_CAR (cddr_expr); | |
1584 | check_bindings (bindings, expr); | |
1585 | ||
1586 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1587 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1588 | ||
1589 | { | |
1590 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1591 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1592 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1593 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1594 | ||
1595 | const SCM rvar = scm_list_1 (name); | |
1596 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1597 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1598 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1599 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1600 | return scm_cons_source (expr, letrec_form, inits); | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1605 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1606 | SCM |
d6754c23 | 1607 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1608 | { |
d6754c23 DH |
1609 | SCM bindings; |
1610 | ||
1611 | const SCM cdr_expr = SCM_CDR (expr); | |
1612 | const long length = scm_ilength (cdr_expr); | |
1613 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1614 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1615 | |
d6754c23 | 1616 | bindings = SCM_CAR (cdr_expr); |
cc95e00a | 1617 | if (scm_is_symbol (bindings)) |
26d5b9b4 | 1618 | { |
d6754c23 DH |
1619 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1620 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1621 | } |
d6754c23 DH |
1622 | |
1623 | check_bindings (bindings, expr); | |
a61f4e0c | 1624 | if (scm_is_null (bindings) || scm_is_null (SCM_CDR (bindings))) |
26d5b9b4 | 1625 | { |
d6754c23 | 1626 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1627 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1628 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1629 | } |
302c12b4 DH |
1630 | else |
1631 | { | |
d6754c23 DH |
1632 | /* plain let */ |
1633 | SCM rvariables; | |
1634 | SCM inits; | |
1635 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1636 | |
302c12b4 | 1637 | { |
430b8401 | 1638 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1639 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1640 | SCM_SETCAR (expr, SCM_IM_LET); | |
1641 | SCM_SETCDR (expr, new_tail); | |
1642 | return expr; | |
302c12b4 DH |
1643 | } |
1644 | } | |
0f2d19dd JB |
1645 | } |
1646 | ||
212e58ed DH |
1647 | static SCM |
1648 | build_binding_list (SCM rnames, SCM rinits) | |
1649 | { | |
1650 | SCM bindings = SCM_EOL; | |
a61f4e0c | 1651 | while (!scm_is_null (rnames)) |
212e58ed DH |
1652 | { |
1653 | const SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); | |
1654 | bindings = scm_cons (binding, bindings); | |
1655 | rnames = SCM_CDR (rnames); | |
1656 | rinits = SCM_CDR (rinits); | |
1657 | } | |
1658 | return bindings; | |
1659 | } | |
1660 | ||
1661 | static SCM | |
1662 | unmemoize_let (const SCM expr, const SCM env) | |
1663 | { | |
1664 | const SCM cdr_expr = SCM_CDR (expr); | |
1665 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1666 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1667 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1668 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), env); | |
1669 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1670 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1671 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1672 | ||
1673 | return scm_cons2 (scm_sym_let, um_bindings, um_body); | |
1674 | } | |
1675 | ||
1676 | ||
1677 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); | |
1678 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); | |
1679 | ||
1680 | SCM | |
1681 | scm_m_letrec (SCM expr, SCM env) | |
1682 | { | |
1683 | SCM bindings; | |
1684 | ||
1685 | const SCM cdr_expr = SCM_CDR (expr); | |
1686 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1687 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1688 | ||
1689 | bindings = SCM_CAR (cdr_expr); | |
a61f4e0c | 1690 | if (scm_is_null (bindings)) |
212e58ed DH |
1691 | { |
1692 | /* no bindings, let* is executed faster */ | |
1693 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1694 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); | |
1695 | } | |
1696 | else | |
1697 | { | |
1698 | SCM rvariables; | |
1699 | SCM inits; | |
1700 | SCM new_body; | |
1701 | ||
1702 | check_bindings (bindings, expr); | |
1703 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1704 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); | |
1705 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | static SCM | |
1710 | unmemoize_letrec (const SCM expr, const SCM env) | |
1711 | { | |
1712 | const SCM cdr_expr = SCM_CDR (expr); | |
1713 | const SCM um_rnames = SCM_CAR (cdr_expr); | |
1714 | const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env); | |
1715 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1716 | const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), extended_env); | |
1717 | const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED); | |
1718 | const SCM um_bindings = build_binding_list (um_rnames, um_rinits); | |
1719 | const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env); | |
1720 | ||
1721 | return scm_cons2 (scm_sym_letrec, um_bindings, um_body); | |
1722 | } | |
1723 | ||
1724 | ||
0f2d19dd | 1725 | |
3b88ed2a | 1726 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1727 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1728 | |
d6754c23 DH |
1729 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1730 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1731 | SCM |
d6754c23 | 1732 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1733 | { |
d6754c23 | 1734 | SCM binding_idx; |
d6754c23 | 1735 | SCM new_body; |
0f2d19dd | 1736 | |
d6754c23 DH |
1737 | const SCM cdr_expr = SCM_CDR (expr); |
1738 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1739 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1740 | |
d6754c23 DH |
1741 | binding_idx = SCM_CAR (cdr_expr); |
1742 | check_bindings (binding_idx, expr); | |
1743 | ||
461bffb1 DH |
1744 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1745 | * transformation is done in place. At the beginning of one iteration of | |
1746 | * the loop the variable binding_idx holds the form | |
1747 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1748 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1749 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1750 | * untouched. After the execution of the loop, P1 will hold | |
1751 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1752 | * and binding_idx will hold P3. */ | |
a61f4e0c | 1753 | while (!scm_is_null (binding_idx)) |
9fbee57e | 1754 | { |
461bffb1 | 1755 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1756 | const SCM binding = SCM_CAR (binding_idx); |
1757 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1758 | const SCM cdr_binding = SCM_CDR (binding); |
1759 | ||
1760 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1761 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1762 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1763 | ||
1764 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1765 | } |
1766 | ||
430b8401 | 1767 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1768 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1769 | /* the bindings have been changed in place */ | |
1770 | SCM_SETCDR (cdr_expr, new_body); | |
1771 | return expr; | |
9fbee57e | 1772 | } |
b8229a3b | 1773 | |
212e58ed DH |
1774 | static SCM |
1775 | unmemoize_letstar (const SCM expr, const SCM env) | |
0f2d19dd | 1776 | { |
d6754c23 | 1777 | const SCM cdr_expr = SCM_CDR (expr); |
212e58ed DH |
1778 | const SCM body = SCM_CDR (cdr_expr); |
1779 | SCM bindings = SCM_CAR (cdr_expr); | |
1780 | SCM um_bindings = SCM_EOL; | |
1781 | SCM extended_env = env; | |
1782 | SCM um_body; | |
d6754c23 | 1783 | |
a61f4e0c | 1784 | while (!scm_is_null (bindings)) |
9fbee57e | 1785 | { |
212e58ed DH |
1786 | const SCM variable = SCM_CAR (bindings); |
1787 | const SCM init = SCM_CADR (bindings); | |
1788 | const SCM um_init = unmemoize_expression (init, extended_env); | |
1789 | um_bindings = scm_cons (scm_list_2 (variable, um_init), um_bindings); | |
1790 | extended_env = SCM_EXTEND_ENV (variable, SCM_BOOL_F, extended_env); | |
1791 | bindings = SCM_CDDR (bindings); | |
9fbee57e | 1792 | } |
212e58ed | 1793 | um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED); |
d6754c23 | 1794 | |
212e58ed DH |
1795 | um_body = unmemoize_exprs (body, extended_env); |
1796 | ||
1797 | return scm_cons2 (scm_sym_letstar, um_bindings, um_body); | |
0f2d19dd JB |
1798 | } |
1799 | ||
73b64342 | 1800 | |
3b88ed2a | 1801 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1802 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1803 | |
1804 | SCM | |
21628685 | 1805 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1806 | { |
21628685 DH |
1807 | const SCM cdr_expr = SCM_CDR (expr); |
1808 | const long length = scm_ilength (cdr_expr); | |
1809 | ||
1810 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1811 | ||
1812 | if (length == 0) | |
1813 | { | |
1814 | /* Special case: (or) is replaced by #f. */ | |
1815 | return SCM_BOOL_F; | |
1816 | } | |
9fbee57e | 1817 | else |
21628685 DH |
1818 | { |
1819 | SCM_SETCAR (expr, SCM_IM_OR); | |
1820 | return expr; | |
1821 | } | |
73b64342 MD |
1822 | } |
1823 | ||
212e58ed DH |
1824 | static SCM |
1825 | unmemoize_or (const SCM expr, const SCM env) | |
1826 | { | |
1827 | return scm_cons (scm_sym_or, unmemoize_exprs (SCM_CDR (expr), env)); | |
1828 | } | |
1829 | ||
73b64342 | 1830 | |
9fbee57e DH |
1831 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1832 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1833 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1834 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1835 | |
1836 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1837 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1838 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1839 | * nesting level and is known to be greater than zero. */ | |
1840 | static SCM | |
1841 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1842 | { |
a61f4e0c | 1843 | if (scm_is_pair (form)) |
c96d76b8 | 1844 | { |
21628685 | 1845 | const SCM tmp = SCM_CAR (form); |
bc36d050 | 1846 | if (scm_is_eq (tmp, scm_sym_quasiquote)) |
9fbee57e | 1847 | { |
21628685 DH |
1848 | const SCM args = SCM_CDR (form); |
1849 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1850 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1851 | } | |
bc36d050 | 1852 | else if (scm_is_eq (tmp, scm_sym_unquote)) |
9fbee57e | 1853 | { |
21628685 DH |
1854 | const SCM args = SCM_CDR (form); |
1855 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1856 | if (depth - 1 == 0) |
1857 | return scm_eval_car (args, env); | |
1858 | else | |
1859 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1860 | } | |
a61f4e0c | 1861 | else if (scm_is_pair (tmp) |
bc36d050 | 1862 | && scm_is_eq (SCM_CAR (tmp), scm_sym_uq_splicing)) |
9fbee57e | 1863 | { |
21628685 DH |
1864 | const SCM args = SCM_CDR (tmp); |
1865 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1866 | if (depth - 1 == 0) |
1867 | { | |
21628685 DH |
1868 | const SCM list = scm_eval_car (args, env); |
1869 | const SCM rest = SCM_CDR (form); | |
1870 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1871 | s_splicing, list, form); | |
9fbee57e DH |
1872 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1873 | } | |
1874 | else | |
1875 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1876 | iqq (SCM_CDR (form), env, depth)); | |
1877 | } | |
1878 | else | |
1879 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1880 | iqq (SCM_CDR (form), env, depth)); | |
1881 | } | |
4057a3e0 MV |
1882 | else if (scm_is_vector (form)) |
1883 | return scm_vector (iqq (scm_vector_to_list (form), env, depth)); | |
9fbee57e DH |
1884 | else |
1885 | return form; | |
1886 | } | |
1887 | ||
1888 | SCM | |
21628685 | 1889 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1890 | { |
21628685 DH |
1891 | const SCM cdr_expr = SCM_CDR (expr); |
1892 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1893 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1894 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1895 | } |
1896 | ||
1897 | ||
3b88ed2a | 1898 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1899 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1900 | ||
1901 | SCM | |
21628685 | 1902 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1903 | { |
21628685 DH |
1904 | SCM quotee; |
1905 | ||
1906 | const SCM cdr_expr = SCM_CDR (expr); | |
1907 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1908 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1909 | quotee = SCM_CAR (cdr_expr); | |
5fb64383 | 1910 | if (is_self_quoting_p (quotee)) |
21628685 | 1911 | return quotee; |
e7313a9d | 1912 | |
21628685 | 1913 | SCM_SETCAR (expr, SCM_IM_QUOTE); |
e7313a9d | 1914 | SCM_SETCDR (expr, quotee); |
21628685 | 1915 | return expr; |
9fbee57e DH |
1916 | } |
1917 | ||
e7313a9d DH |
1918 | static SCM |
1919 | unmemoize_quote (const SCM expr, const SCM env SCM_UNUSED) | |
1920 | { | |
1921 | return scm_list_2 (scm_sym_quote, SCM_CDR (expr)); | |
1922 | } | |
1923 | ||
9fbee57e DH |
1924 | |
1925 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1926 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1927 | static const char s_set_x[] = "set!"; |
1928 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1929 | ||
1930 | SCM | |
82b3e2c6 | 1931 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1932 | { |
82b3e2c6 | 1933 | SCM variable; |
36245b66 | 1934 | SCM new_variable; |
82b3e2c6 DH |
1935 | |
1936 | const SCM cdr_expr = SCM_CDR (expr); | |
1937 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1938 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1939 | variable = SCM_CAR (cdr_expr); | |
36245b66 DH |
1940 | |
1941 | /* Memoize the variable form. */ | |
cc95e00a | 1942 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
36245b66 | 1943 | new_variable = lookup_symbol (variable, env); |
36245b66 DH |
1944 | /* Leave the memoization of unbound symbols to lazy memoization: */ |
1945 | if (SCM_UNBNDP (new_variable)) | |
1946 | new_variable = variable; | |
82b3e2c6 DH |
1947 | |
1948 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
36245b66 | 1949 | SCM_SETCAR (cdr_expr, new_variable); |
82b3e2c6 | 1950 | return expr; |
9fbee57e DH |
1951 | } |
1952 | ||
212e58ed DH |
1953 | static SCM |
1954 | unmemoize_set_x (const SCM expr, const SCM env) | |
1955 | { | |
1956 | return scm_cons (scm_sym_set_x, unmemoize_exprs (SCM_CDR (expr), env)); | |
1957 | } | |
1958 | ||
9fbee57e DH |
1959 | |
1960 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1961 | ||
1962 | ||
3b88ed2a | 1963 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1964 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1965 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1966 | ||
1967 | SCM | |
82b3e2c6 | 1968 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1969 | { |
82b3e2c6 DH |
1970 | const SCM cdr_expr = SCM_CDR (expr); |
1971 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1972 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1973 | |
82b3e2c6 DH |
1974 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1975 | return expr; | |
1976 | } | |
2e171178 | 1977 | |
212e58ed DH |
1978 | static SCM |
1979 | unmemoize_apply (const SCM expr, const SCM env) | |
1980 | { | |
1981 | return scm_list_2 (scm_sym_atapply, unmemoize_exprs (SCM_CDR (expr), env)); | |
1982 | } | |
1983 | ||
2e171178 | 1984 | |
3b88ed2a | 1985 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1986 | |
82b3e2c6 DH |
1987 | /* FIXME: The following explanation should go into the documentation: */ |
1988 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1989 | * the global variables named by `var's (symbols, not evaluated), creating | |
1990 | * them if they don't exist, executes body, and then restores the previous | |
1991 | * values of the `var's. Additionally, whenever control leaves body, the | |
1992 | * values of the `var's are saved and restored when control returns. It is an | |
1993 | * error when a symbol appears more than once among the `var's. All `init's | |
1994 | * are evaluated before any `var' is set. | |
1995 | * | |
1996 | * Think of this as `let' for dynamic scope. | |
1997 | */ | |
1998 | ||
1999 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
2000 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
2001 | * | |
2002 | * FIXME - also implement `@bind*'. | |
2003 | */ | |
73b64342 | 2004 | SCM |
82b3e2c6 | 2005 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 2006 | { |
82b3e2c6 DH |
2007 | SCM bindings; |
2008 | SCM rvariables; | |
2009 | SCM inits; | |
2010 | SCM variable_idx; | |
2e171178 | 2011 | |
82b3e2c6 | 2012 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 2013 | |
82b3e2c6 DH |
2014 | const SCM cdr_expr = SCM_CDR (expr); |
2015 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2016 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
2017 | bindings = SCM_CAR (cdr_expr); | |
2018 | check_bindings (bindings, expr); | |
2019 | transform_bindings (bindings, expr, &rvariables, &inits); | |
2020 | ||
2021 | for (variable_idx = rvariables; | |
a61f4e0c | 2022 | !scm_is_null (variable_idx); |
82b3e2c6 | 2023 | variable_idx = SCM_CDR (variable_idx)) |
73b64342 | 2024 | { |
82b3e2c6 DH |
2025 | /* The first call to scm_sym2var will look beyond the current module, |
2026 | * while the second call wont. */ | |
2027 | const SCM variable = SCM_CAR (variable_idx); | |
2028 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
7888309b | 2029 | if (scm_is_false (new_variable)) |
82b3e2c6 DH |
2030 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); |
2031 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 2032 | } |
82b3e2c6 DH |
2033 | |
2034 | SCM_SETCAR (expr, SCM_IM_BIND); | |
2035 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
2036 | return expr; | |
73b64342 | 2037 | } |
73b64342 | 2038 | |
b0c5d67b | 2039 | |
3b88ed2a | 2040 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
2041 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
2042 | ||
9fbee57e | 2043 | SCM |
da48db62 | 2044 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2045 | { |
da48db62 DH |
2046 | const SCM cdr_expr = SCM_CDR (expr); |
2047 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2048 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2049 | ||
2050 | SCM_SETCAR (expr, SCM_IM_CONT); | |
2051 | return expr; | |
b0c5d67b | 2052 | } |
b0c5d67b | 2053 | |
212e58ed DH |
2054 | static SCM |
2055 | unmemoize_atcall_cc (const SCM expr, const SCM env) | |
2056 | { | |
2057 | return scm_list_2 (scm_sym_atcall_cc, unmemoize_exprs (SCM_CDR (expr), env)); | |
2058 | } | |
2059 | ||
b0c5d67b | 2060 | |
3b88ed2a | 2061 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 2062 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
2063 | |
2064 | SCM | |
da48db62 | 2065 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 2066 | { |
da48db62 DH |
2067 | const SCM cdr_expr = SCM_CDR (expr); |
2068 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2069 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2070 | ||
2071 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
2072 | return expr; | |
b0c5d67b | 2073 | } |
b0c5d67b | 2074 | |
212e58ed DH |
2075 | static SCM |
2076 | unmemoize_at_call_with_values (const SCM expr, const SCM env) | |
2077 | { | |
2078 | return scm_list_2 (scm_sym_at_call_with_values, | |
2079 | unmemoize_exprs (SCM_CDR (expr), env)); | |
2080 | } | |
2081 | ||
b0c5d67b | 2082 | |
3b88ed2a | 2083 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 2084 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 2085 | |
9fbee57e DH |
2086 | /* Like promises, futures are implemented as closures with an empty |
2087 | * parameter list. Thus, (future <expression>) is transformed into | |
2088 | * (#@future '() <expression>), where the empty list represents the | |
2089 | * empty parameter list. This representation allows for easy creation | |
2090 | * of the closure during evaluation. */ | |
a513ead3 | 2091 | SCM |
8ae95199 | 2092 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 2093 | { |
8ae95199 DH |
2094 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
2095 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
2096 | return new_expr; | |
a513ead3 MV |
2097 | } |
2098 | ||
212e58ed DH |
2099 | static SCM |
2100 | unmemoize_future (const SCM expr, const SCM env) | |
2101 | { | |
2102 | const SCM thunk_expr = SCM_CADDR (expr); | |
2103 | return scm_list_2 (scm_sym_future, unmemoize_expression (thunk_expr, env)); | |
2104 | } | |
2105 | ||
9fbee57e | 2106 | |
3b88ed2a | 2107 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
2108 | SCM_SYMBOL (scm_sym_setter, "setter"); |
2109 | ||
2110 | SCM | |
7893dbbf | 2111 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 2112 | { |
7893dbbf | 2113 | SCM target, exp_target; |
da48db62 DH |
2114 | |
2115 | const SCM cdr_expr = SCM_CDR (expr); | |
2116 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2117 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2118 | ||
2119 | target = SCM_CAR (cdr_expr); | |
a61f4e0c | 2120 | if (!scm_is_pair (target)) |
da48db62 DH |
2121 | { |
2122 | /* R5RS usage */ | |
2123 | return scm_m_set_x (expr, env); | |
2124 | } | |
9fbee57e | 2125 | else |
da48db62 DH |
2126 | { |
2127 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
2128 | /* Macroexpanding the target might return things of the form |
2129 | (begin <atom>). In that case, <atom> must be a symbol or a | |
2130 | variable and we memoize to (set! <atom> ...). | |
2131 | */ | |
2b189e65 | 2132 | exp_target = macroexp (target, env); |
bc36d050 | 2133 | if (scm_is_eq (SCM_CAR (exp_target), SCM_IM_BEGIN) |
a61f4e0c MV |
2134 | && !scm_is_null (SCM_CDR (exp_target)) |
2135 | && scm_is_null (SCM_CDDR (exp_target))) | |
7893dbbf MV |
2136 | { |
2137 | exp_target= SCM_CADR (exp_target); | |
cc95e00a | 2138 | ASSERT_SYNTAX_2 (scm_is_symbol (exp_target) |
6d1a2e9f MV |
2139 | || SCM_VARIABLEP (exp_target), |
2140 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
2141 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
2142 | SCM_CDR (cdr_expr))); | |
2143 | } | |
2144 | else | |
2145 | { | |
2146 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
2147 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
2148 | setter_proc_tail); | |
da48db62 | 2149 | |
7893dbbf MV |
2150 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
2151 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
2152 | cddr_expr)); | |
da48db62 | 2153 | |
7893dbbf MV |
2154 | SCM_SETCAR (expr, setter_proc); |
2155 | SCM_SETCDR (expr, setter_args); | |
2156 | return expr; | |
2157 | } | |
da48db62 | 2158 | } |
9fbee57e DH |
2159 | } |
2160 | ||
2161 | ||
a4aa2134 DH |
2162 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
2163 | * soon as the module system allows us to more freely create bindings in | |
2164 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2165 | * moved here. */ | |
212e58ed DH |
2166 | |
2167 | SCM_SYMBOL (sym_atslot_ref, "@slot-ref"); | |
2168 | ||
9fbee57e | 2169 | SCM |
9a848baf | 2170 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2171 | { |
9a848baf DH |
2172 | SCM slot_nr; |
2173 | ||
2174 | const SCM cdr_expr = SCM_CDR (expr); | |
2175 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2176 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
2177 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2178 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9fbee57e | 2179 | |
9a848baf | 2180 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
e7313a9d | 2181 | SCM_SETCDR (cdr_expr, slot_nr); |
9a848baf DH |
2182 | return expr; |
2183 | } | |
9fbee57e | 2184 | |
212e58ed DH |
2185 | static SCM |
2186 | unmemoize_atslot_ref (const SCM expr, const SCM env) | |
2187 | { | |
2188 | const SCM instance = SCM_CADR (expr); | |
2189 | const SCM um_instance = unmemoize_expression (instance, env); | |
2190 | const SCM slot_nr = SCM_CDDR (expr); | |
2191 | return scm_list_3 (sym_atslot_ref, um_instance, slot_nr); | |
2192 | } | |
2193 | ||
9fbee57e | 2194 | |
a4aa2134 DH |
2195 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
2196 | * soon as the module system allows us to more freely create bindings in | |
2197 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2198 | * moved here. */ | |
212e58ed DH |
2199 | |
2200 | SCM_SYMBOL (sym_atslot_set_x, "@slot-set!"); | |
2201 | ||
9fbee57e | 2202 | SCM |
9a848baf | 2203 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2204 | { |
9a848baf DH |
2205 | SCM slot_nr; |
2206 | ||
2207 | const SCM cdr_expr = SCM_CDR (expr); | |
2208 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2209 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
2210 | slot_nr = SCM_CADR (cdr_expr); | |
e11e83f3 | 2211 | ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); |
9a848baf DH |
2212 | |
2213 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
2214 | return expr; | |
9fbee57e | 2215 | } |
9fbee57e | 2216 | |
212e58ed DH |
2217 | static SCM |
2218 | unmemoize_atslot_set_x (const SCM expr, const SCM env) | |
2219 | { | |
2220 | const SCM cdr_expr = SCM_CDR (expr); | |
2221 | const SCM instance = SCM_CAR (cdr_expr); | |
2222 | const SCM um_instance = unmemoize_expression (instance, env); | |
2223 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
2224 | const SCM slot_nr = SCM_CAR (cddr_expr); | |
2225 | const SCM cdddr_expr = SCM_CDR (cddr_expr); | |
2226 | const SCM value = SCM_CAR (cdddr_expr); | |
2227 | const SCM um_value = unmemoize_expression (value, env); | |
2228 | return scm_list_4 (sym_atslot_set_x, um_instance, slot_nr, um_value); | |
2229 | } | |
2230 | ||
9fbee57e DH |
2231 | |
2232 | #if SCM_ENABLE_ELISP | |
2233 | ||
70c1c108 DH |
2234 | static const char s_defun[] = "Symbol's function definition is void"; |
2235 | ||
3b88ed2a | 2236 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 2237 | |
70c1c108 DH |
2238 | /* nil-cond expressions have the form |
2239 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 2240 | SCM |
70c1c108 | 2241 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2242 | { |
70c1c108 DH |
2243 | const long length = scm_ilength (SCM_CDR (expr)); |
2244 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
2245 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
2246 | ||
2247 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
2248 | return expr; | |
9fbee57e DH |
2249 | } |
2250 | ||
2251 | ||
3b88ed2a | 2252 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 2253 | |
70c1c108 DH |
2254 | /* The @fop-macro handles procedure and macro applications for elisp. The |
2255 | * input expression must have the form | |
2256 | * (@fop <var> (transformer-macro <expr> ...)) | |
2257 | * where <var> must be a symbol. The expression is transformed into the | |
2258 | * memoized form of either | |
2259 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
2260 | * if the value of var (across all aliasing) is not a macro, or | |
2261 | * (<un-aliased var> <expr> ...) | |
2262 | * if var is a macro. */ | |
9fbee57e | 2263 | SCM |
70c1c108 | 2264 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2265 | { |
70c1c108 DH |
2266 | SCM location; |
2267 | SCM symbol; | |
2268 | ||
2269 | const SCM cdr_expr = SCM_CDR (expr); | |
2270 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2271 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
2272 | ||
2273 | symbol = SCM_CAR (cdr_expr); | |
cc95e00a | 2274 | ASSERT_SYNTAX_2 (scm_is_symbol (symbol), s_bad_variable, symbol, expr); |
70c1c108 DH |
2275 | |
2276 | location = scm_symbol_fref (symbol); | |
2277 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
2278 | ||
2279 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
2280 | * look up such definitions, the chain of symbol definitions has to be | |
2281 | * followed up to the terminal symbol. */ | |
cc95e00a | 2282 | while (scm_is_symbol (SCM_VARIABLE_REF (location))) |
9fbee57e | 2283 | { |
70c1c108 DH |
2284 | const SCM alias = SCM_VARIABLE_REF (location); |
2285 | location = scm_symbol_fref (alias); | |
2286 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 2287 | } |
70c1c108 DH |
2288 | |
2289 | /* Memoize the value location belonging to the terminal symbol. */ | |
2290 | SCM_SETCAR (cdr_expr, location); | |
2291 | ||
2292 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2293 | { |
70c1c108 DH |
2294 | /* Since the location does not contain a macro, the form is a procedure |
2295 | * application. Replace `@fop' by `@apply' and transform the expression | |
2296 | * including the `transformer-macro'. */ | |
2297 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2298 | return expr; | |
2299 | } | |
2300 | else | |
2301 | { | |
2302 | /* Since the location contains a macro, the arguments should not be | |
2303 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2304 | * expression starts with the memoized variable, that is at the cdr of | |
2305 | * the input expression. */ | |
2306 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2307 | return cdr_expr; | |
9fbee57e | 2308 | } |
9fbee57e DH |
2309 | } |
2310 | ||
2311 | #endif /* SCM_ENABLE_ELISP */ | |
2312 | ||
2313 | ||
212e58ed DH |
2314 | static SCM |
2315 | unmemoize_builtin_macro (const SCM expr, const SCM env) | |
2316 | { | |
2317 | switch (ISYMNUM (SCM_CAR (expr))) | |
2318 | { | |
2319 | case (ISYMNUM (SCM_IM_AND)): | |
2320 | return unmemoize_and (expr, env); | |
2321 | ||
2322 | case (ISYMNUM (SCM_IM_BEGIN)): | |
2323 | return unmemoize_begin (expr, env); | |
2324 | ||
2325 | case (ISYMNUM (SCM_IM_CASE)): | |
2326 | return unmemoize_case (expr, env); | |
2327 | ||
2328 | case (ISYMNUM (SCM_IM_COND)): | |
2329 | return unmemoize_cond (expr, env); | |
2330 | ||
2331 | case (ISYMNUM (SCM_IM_DELAY)): | |
2332 | return unmemoize_delay (expr, env); | |
2333 | ||
2334 | case (ISYMNUM (SCM_IM_DO)): | |
2335 | return unmemoize_do (expr, env); | |
2336 | ||
2337 | case (ISYMNUM (SCM_IM_IF)): | |
2338 | return unmemoize_if (expr, env); | |
2339 | ||
2340 | case (ISYMNUM (SCM_IM_LAMBDA)): | |
2341 | return unmemoize_lambda (expr, env); | |
2342 | ||
2343 | case (ISYMNUM (SCM_IM_LET)): | |
2344 | return unmemoize_let (expr, env); | |
2345 | ||
2346 | case (ISYMNUM (SCM_IM_LETREC)): | |
2347 | return unmemoize_letrec (expr, env); | |
2348 | ||
2349 | case (ISYMNUM (SCM_IM_LETSTAR)): | |
2350 | return unmemoize_letstar (expr, env); | |
2351 | ||
2352 | case (ISYMNUM (SCM_IM_OR)): | |
2353 | return unmemoize_or (expr, env); | |
2354 | ||
2355 | case (ISYMNUM (SCM_IM_QUOTE)): | |
2356 | return unmemoize_quote (expr, env); | |
2357 | ||
2358 | case (ISYMNUM (SCM_IM_SET_X)): | |
2359 | return unmemoize_set_x (expr, env); | |
2360 | ||
2361 | case (ISYMNUM (SCM_IM_APPLY)): | |
2362 | return unmemoize_apply (expr, env); | |
2363 | ||
2364 | case (ISYMNUM (SCM_IM_BIND)): | |
2365 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2366 | ||
2367 | case (ISYMNUM (SCM_IM_CONT)): | |
2368 | return unmemoize_atcall_cc (expr, env); | |
2369 | ||
2370 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): | |
2371 | return unmemoize_at_call_with_values (expr, env); | |
2372 | ||
2373 | case (ISYMNUM (SCM_IM_FUTURE)): | |
2374 | return unmemoize_future (expr, env); | |
2375 | ||
2376 | case (ISYMNUM (SCM_IM_SLOT_REF)): | |
2377 | return unmemoize_atslot_ref (expr, env); | |
2378 | ||
2379 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): | |
2380 | return unmemoize_atslot_set_x (expr, env); | |
2381 | ||
2382 | case (ISYMNUM (SCM_IM_NIL_COND)): | |
2383 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2384 | ||
2385 | default: | |
2386 | return unmemoize_exprs (expr, env); /* FIXME */ | |
2387 | } | |
2388 | } | |
2389 | ||
2390 | ||
9fcf3cbb DH |
2391 | /* scm_i_unmemocopy_expr and scm_i_unmemocopy_body take a memoized expression |
2392 | * respectively a memoized body together with its environment and rewrite it | |
2393 | * to its original form. Thus, these functions are the inversion of the | |
2394 | * rewrite rules above. The procedure is not optimized for speed. It's used | |
2395 | * in scm_i_unmemoize_expr, scm_procedure_source, macro_print and scm_iprin1. | |
212e58ed DH |
2396 | * |
2397 | * Unmemoizing is not a reliable process. You cannot in general expect to get | |
2398 | * the original source back. | |
2399 | * | |
2400 | * However, GOOPS currently relies on this for method compilation. This ought | |
2401 | * to change. */ | |
2402 | ||
2403 | SCM | |
9fcf3cbb DH |
2404 | scm_i_unmemocopy_expr (SCM expr, SCM env) |
2405 | { | |
2406 | const SCM source_properties = scm_whash_lookup (scm_source_whash, expr); | |
2407 | const SCM um_expr = unmemoize_expression (expr, env); | |
2408 | ||
7888309b | 2409 | if (scm_is_true (source_properties)) |
9fcf3cbb DH |
2410 | scm_whash_insert (scm_source_whash, um_expr, source_properties); |
2411 | ||
2412 | return um_expr; | |
2413 | } | |
2414 | ||
2415 | SCM | |
2416 | scm_i_unmemocopy_body (SCM forms, SCM env) | |
212e58ed DH |
2417 | { |
2418 | const SCM source_properties = scm_whash_lookup (scm_source_whash, forms); | |
2419 | const SCM um_forms = unmemoize_exprs (forms, env); | |
2420 | ||
7888309b | 2421 | if (scm_is_true (source_properties)) |
212e58ed DH |
2422 | scm_whash_insert (scm_source_whash, um_forms, source_properties); |
2423 | ||
2424 | return um_forms; | |
2425 | } | |
2426 | ||
2427 | ||
434f2f7a | 2428 | #if (SCM_ENABLE_DEPRECATED == 1) |
f58c472a | 2429 | |
434f2f7a DH |
2430 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ |
2431 | SCM | |
2432 | scm_m_expand_body (SCM exprs, SCM env) | |
2433 | { | |
2434 | scm_c_issue_deprecation_warning | |
2435 | ("`scm_m_expand_body' is deprecated."); | |
2436 | m_expand_body (exprs, env); | |
2437 | return exprs; | |
2438 | } | |
f58c472a | 2439 | |
f58c472a DH |
2440 | |
2441 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2442 | ||
2443 | SCM | |
70c1c108 | 2444 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2445 | { |
70c1c108 DH |
2446 | SCM variable; |
2447 | SCM location; | |
2448 | ||
2449 | const SCM cdr_expr = SCM_CDR (expr); | |
2450 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2451 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2452 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2453 | ||
2b189e65 MV |
2454 | scm_c_issue_deprecation_warning |
2455 | ("`undefine' is deprecated.\n"); | |
2456 | ||
70c1c108 | 2457 | variable = SCM_CAR (cdr_expr); |
cc95e00a | 2458 | ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr); |
70c1c108 | 2459 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); |
7888309b | 2460 | ASSERT_SYNTAX_2 (scm_is_true (location) |
70c1c108 DH |
2461 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), |
2462 | "variable already unbound ", variable, expr); | |
2463 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2464 | return SCM_UNSPECIFIED; |
f58c472a DH |
2465 | } |
2466 | ||
26d5b9b4 MD |
2467 | SCM |
2468 | scm_macroexp (SCM x, SCM env) | |
2469 | { | |
2b189e65 MV |
2470 | scm_c_issue_deprecation_warning |
2471 | ("`scm_macroexp' is deprecated."); | |
2472 | return macroexp (x, env); | |
26d5b9b4 | 2473 | } |
73b64342 | 2474 | |
6f81708a DH |
2475 | #endif |
2476 | ||
60a49842 | 2477 | |
212e58ed | 2478 | #if (SCM_ENABLE_DEPRECATED == 1) |
26d5b9b4 | 2479 | |
212e58ed DH |
2480 | SCM |
2481 | scm_unmemocar (SCM form, SCM env) | |
8ea46249 | 2482 | { |
212e58ed DH |
2483 | scm_c_issue_deprecation_warning |
2484 | ("`scm_unmemocar' is deprecated."); | |
60a49842 | 2485 | |
a61f4e0c | 2486 | if (!scm_is_pair (form)) |
60a49842 DH |
2487 | return form; |
2488 | else | |
2489 | { | |
2490 | SCM c = SCM_CAR (form); | |
2491 | if (SCM_VARIABLEP (c)) | |
2492 | { | |
2493 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
7888309b | 2494 | if (scm_is_false (sym)) |
60a49842 DH |
2495 | sym = sym_three_question_marks; |
2496 | SCM_SETCAR (form, sym); | |
2497 | } | |
2498 | else if (SCM_ILOCP (c)) | |
2499 | { | |
2500 | unsigned long int ir; | |
2501 | ||
2502 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2503 | env = SCM_CDR (env); | |
2504 | env = SCM_CAAR (env); | |
2505 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2506 | env = SCM_CDR (env); | |
f62b9dff | 2507 | |
60a49842 DH |
2508 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2509 | } | |
2510 | return form; | |
2511 | } | |
2512 | } | |
2513 | ||
434f2f7a DH |
2514 | #endif |
2515 | ||
6f81708a DH |
2516 | /*****************************************************************************/ |
2517 | /*****************************************************************************/ | |
2518 | /* The definitions for execution start here. */ | |
2519 | /*****************************************************************************/ | |
2520 | /*****************************************************************************/ | |
2521 | ||
2522 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2523 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2524 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2525 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
2526 | ||
2527 | /* A function object to implement "apply" for non-closure functions. */ | |
2528 | static SCM f_apply; | |
2529 | /* An endless list consisting of #<undefined> objects: */ | |
2530 | static SCM undefineds; | |
2531 | ||
2532 | ||
2533 | int | |
6e8d25a6 | 2534 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2535 | { |
a61f4e0c | 2536 | while (!scm_is_null (formals)) |
0f2d19dd | 2537 | { |
a61f4e0c | 2538 | if (!scm_is_pair (formals)) |
ff467021 | 2539 | return 0; |
a61f4e0c | 2540 | if (scm_is_null (args)) |
ff467021 | 2541 | return 1; |
0f2d19dd JB |
2542 | formals = SCM_CDR (formals); |
2543 | args = SCM_CDR (args); | |
2544 | } | |
a61f4e0c | 2545 | return !scm_is_null (args) ? 1 : 0; |
0f2d19dd | 2546 | } |
a392ee15 | 2547 | |
0f2d19dd | 2548 | \f |
62360b89 | 2549 | |
434f2f7a DH |
2550 | /* The evaluator contains a plethora of EVAL symbols. This is an attempt at |
2551 | * explanation. | |
62360b89 | 2552 | * |
434f2f7a DH |
2553 | * The following macros should be used in code which is read twice (where the |
2554 | * choice of evaluator is hard soldered): | |
62360b89 | 2555 | * |
434f2f7a DH |
2556 | * CEVAL is the symbol used within one evaluator to call itself. |
2557 | * Originally, it is defined to ceval, but is redefined to deval during the | |
2558 | * second pass. | |
62360b89 | 2559 | * |
385609b9 | 2560 | * SCM_I_EVALIM is used when it is known that the expression is an |
62360b89 | 2561 | * immediate. (This macro never calls an evaluator.) |
434f2f7a DH |
2562 | * |
2563 | * EVAL evaluates an expression that is expected to have its symbols already | |
2564 | * memoized. Expressions that are not of the form '(<form> <form> ...)' are | |
2565 | * evaluated inline without calling an evaluator. | |
2566 | * | |
2567 | * EVALCAR evaluates the car of an expression 'X:(Y:<form> <form> ...)', | |
2568 | * potentially replacing a symbol at the position Y:<form> by its memoized | |
2569 | * variable. If Y:<form> is not of the form '(<form> <form> ...)', the | |
2570 | * evaluation is performed inline without calling an evaluator. | |
62360b89 DH |
2571 | * |
2572 | * The following macros should be used in code which is read once | |
2573 | * (where the choice of evaluator is dynamic): | |
2574 | * | |
385609b9 | 2575 | * SCM_I_XEVAL corresponds to EVAL, but uses ceval *or* deval depending on the |
434f2f7a | 2576 | * debugging mode. |
62360b89 | 2577 | * |
385609b9 | 2578 | * SCM_I_XEVALCAR corresponds to EVALCAR, but uses ceval *or* deval depending |
434f2f7a | 2579 | * on the debugging mode. |
62360b89 DH |
2580 | * |
2581 | * The main motivation for keeping this plethora is efficiency | |
2582 | * together with maintainability (=> locality of code). | |
2583 | */ | |
2584 | ||
434f2f7a DH |
2585 | static SCM ceval (SCM x, SCM env); |
2586 | static SCM deval (SCM x, SCM env); | |
2587 | #define CEVAL ceval | |
2588 | ||
62360b89 | 2589 | |
385609b9 | 2590 | #define SCM_I_EVALIM2(x) \ |
bc36d050 | 2591 | ((scm_is_eq ((x), SCM_EOL) \ |
62360b89 DH |
2592 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ |
2593 | : 0), \ | |
2594 | (x)) | |
2595 | ||
385609b9 | 2596 | #define SCM_I_EVALIM(x, env) (SCM_ILOCP (x) \ |
434f2f7a | 2597 | ? *scm_ilookup ((x), (env)) \ |
385609b9 | 2598 | : SCM_I_EVALIM2(x)) |
62360b89 | 2599 | |
385609b9 | 2600 | #define SCM_I_XEVAL(x, env) \ |
434f2f7a | 2601 | (SCM_IMP (x) \ |
385609b9 | 2602 | ? SCM_I_EVALIM2 (x) \ |
434f2f7a DH |
2603 | : (SCM_VARIABLEP (x) \ |
2604 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2605 | : (scm_is_pair (x) \ |
434f2f7a DH |
2606 | ? (scm_debug_mode_p \ |
2607 | ? deval ((x), (env)) \ | |
2608 | : ceval ((x), (env))) \ | |
2609 | : (x)))) | |
2610 | ||
385609b9 | 2611 | #define SCM_I_XEVALCAR(x, env) \ |
434f2f7a | 2612 | (SCM_IMP (SCM_CAR (x)) \ |
385609b9 | 2613 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2614 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2615 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2616 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a DH |
2617 | ? (scm_debug_mode_p \ |
2618 | ? deval (SCM_CAR (x), (env)) \ | |
2619 | : ceval (SCM_CAR (x), (env))) \ | |
cc95e00a | 2620 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2621 | ? SCM_CAR (x) \ |
2622 | : *scm_lookupcar ((x), (env), 1))))) | |
2623 | ||
2624 | #define EVAL(x, env) \ | |
2625 | (SCM_IMP (x) \ | |
385609b9 | 2626 | ? SCM_I_EVALIM ((x), (env)) \ |
434f2f7a DH |
2627 | : (SCM_VARIABLEP (x) \ |
2628 | ? SCM_VARIABLE_REF (x) \ | |
a61f4e0c | 2629 | : (scm_is_pair (x) \ |
434f2f7a DH |
2630 | ? CEVAL ((x), (env)) \ |
2631 | : (x)))) | |
2632 | ||
2633 | #define EVALCAR(x, env) \ | |
2634 | (SCM_IMP (SCM_CAR (x)) \ | |
385609b9 | 2635 | ? SCM_I_EVALIM (SCM_CAR (x), (env)) \ |
434f2f7a DH |
2636 | : (SCM_VARIABLEP (SCM_CAR (x)) \ |
2637 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
a61f4e0c | 2638 | : (scm_is_pair (SCM_CAR (x)) \ |
434f2f7a | 2639 | ? CEVAL (SCM_CAR (x), (env)) \ |
cc95e00a | 2640 | : (!scm_is_symbol (SCM_CAR (x)) \ |
434f2f7a DH |
2641 | ? SCM_CAR (x) \ |
2642 | : *scm_lookupcar ((x), (env), 1))))) | |
62360b89 DH |
2643 | |
2644 | SCM_REC_MUTEX (source_mutex); | |
2645 | ||
2646 | ||
e5156567 DH |
2647 | /* Lookup a given local variable in an environment. The local variable is |
2648 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
2649 | * indicates the relative number of the environment frame (counting upwards | |
2650 | * from the innermost environment frame), binding indicates the number of the | |
2651 | * binding within the frame, and last? (which is extracted from the iloc using | |
2652 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
2653 | * very end of the improper list of bindings. */ | |
2654 | SCM * | |
2655 | scm_ilookup (SCM iloc, SCM env) | |
2656 | { | |
2657 | unsigned int frame_nr = SCM_IFRAME (iloc); | |
2658 | unsigned int binding_nr = SCM_IDIST (iloc); | |
2659 | SCM frames = env; | |
2660 | SCM bindings; | |
2661 | ||
2662 | for (; 0 != frame_nr; --frame_nr) | |
2663 | frames = SCM_CDR (frames); | |
2664 | ||
2665 | bindings = SCM_CAR (frames); | |
2666 | for (; 0 != binding_nr; --binding_nr) | |
2667 | bindings = SCM_CDR (bindings); | |
2668 | ||
2669 | if (SCM_ICDRP (iloc)) | |
2670 | return SCM_CDRLOC (bindings); | |
2671 | return SCM_CARLOC (SCM_CDR (bindings)); | |
2672 | } | |
2673 | ||
2674 | ||
2675 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
2676 | ||
2677 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
2d0c133f MV |
2678 | static void error_defined_variable (SCM symbol) SCM_NORETURN; |
2679 | ||
2680 | /* Call this for variables that are unfound. | |
2681 | */ | |
e5156567 DH |
2682 | static void |
2683 | error_unbound_variable (SCM symbol) | |
2684 | { | |
2685 | scm_error (scm_unbound_variable_key, NULL, | |
2686 | "Unbound variable: ~S", | |
2687 | scm_list_1 (symbol), SCM_BOOL_F); | |
2688 | } | |
2689 | ||
2d0c133f MV |
2690 | /* Call this for variables that are found but contain SCM_UNDEFINED. |
2691 | */ | |
2692 | static void | |
2693 | error_defined_variable (SCM symbol) | |
2694 | { | |
2695 | /* We use the 'unbound-variable' key here as well, since it | |
2696 | basically is the same kind of error, with a slight variation in | |
2697 | the displayed message. | |
2698 | */ | |
2699 | scm_error (scm_unbound_variable_key, NULL, | |
a03bad87 | 2700 | "Variable used before given a value: ~S", |
2d0c133f MV |
2701 | scm_list_1 (symbol), SCM_BOOL_F); |
2702 | } | |
2703 | ||
e5156567 DH |
2704 | |
2705 | /* The Lookup Car Race | |
2706 | - by Eva Luator | |
2707 | ||
2708 | Memoization of variables and special forms is done while executing | |
2709 | the code for the first time. As long as there is only one thread | |
2710 | everything is fine, but as soon as two threads execute the same | |
2711 | code concurrently `for the first time' they can come into conflict. | |
2712 | ||
2713 | This memoization includes rewriting variable references into more | |
2714 | efficient forms and expanding macros. Furthermore, macro expansion | |
2715 | includes `compiling' special forms like `let', `cond', etc. into | |
2716 | tree-code instructions. | |
2717 | ||
2718 | There shouldn't normally be a problem with memoizing local and | |
2719 | global variable references (into ilocs and variables), because all | |
2720 | threads will mutate the code in *exactly* the same way and (if I | |
2721 | read the C code correctly) it is not possible to observe a half-way | |
2722 | mutated cons cell. The lookup procedure can handle this | |
2723 | transparently without any critical sections. | |
2724 | ||
2725 | It is different with macro expansion, because macro expansion | |
2726 | happens outside of the lookup procedure and can't be | |
2727 | undone. Therefore the lookup procedure can't cope with it. It has | |
2728 | to indicate failure when it detects a lost race and hope that the | |
2729 | caller can handle it. Luckily, it turns out that this is the case. | |
2730 | ||
2731 | An example to illustrate this: Suppose that the following form will | |
2732 | be memoized concurrently by two threads | |
2733 | ||
2734 | (let ((x 12)) x) | |
2735 | ||
2736 | Let's first examine the lookup of X in the body. The first thread | |
2737 | decides that it has to find the symbol "x" in the environment and | |
2738 | starts to scan it. Then the other thread takes over and actually | |
2739 | overtakes the first. It looks up "x" and substitutes an | |
2740 | appropriate iloc for it. Now the first thread continues and | |
2741 | completes its lookup. It comes to exactly the same conclusions as | |
2742 | the second one and could - without much ado - just overwrite the | |
2743 | iloc with the same iloc. | |
2744 | ||
2745 | But let's see what will happen when the race occurs while looking | |
2746 | up the symbol "let" at the start of the form. It could happen that | |
2747 | the second thread interrupts the lookup of the first thread and not | |
2748 | only substitutes a variable for it but goes right ahead and | |
2749 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
2750 | the first thread completes its lookup, it would replace the #@let* | |
2751 | with a variable containing the "let" binding, effectively reverting | |
2752 | the form to (let (x 12) x). This is wrong. It has to detect that | |
2753 | it has lost the race and the evaluator has to reconsider the | |
2754 | changed form completely. | |
2755 | ||
2756 | This race condition could be resolved with some kind of traffic | |
2757 | light (like mutexes) around scm_lookupcar, but I think that it is | |
2758 | best to avoid them in this case. They would serialize memoization | |
2759 | completely and because lookup involves calling arbitrary Scheme | |
2760 | code (via the lookup-thunk), threads could be blocked for an | |
2761 | arbitrary amount of time or even deadlock. But with the current | |
2762 | solution a lot of unnecessary work is potentially done. */ | |
2763 | ||
2764 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to | |
2765 | return NULL to indicate a failed lookup due to some race conditions | |
2766 | between threads. This only happens when VLOC is the first cell of | |
2767 | a special form that will eventually be memoized (like `let', etc.) | |
2768 | In that case the whole lookup is bogus and the caller has to | |
2769 | reconsider the complete special form. | |
2770 | ||
2771 | SCM_LOOKUPCAR is still there, of course. It just calls | |
2772 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR | |
2773 | should only be called when it is known that VLOC is not the first | |
2774 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
2775 | for NULL. I think I've found the only places where this | |
2776 | applies. */ | |
2777 | ||
2778 | static SCM * | |
2779 | scm_lookupcar1 (SCM vloc, SCM genv, int check) | |
2780 | { | |
2781 | SCM env = genv; | |
2782 | register SCM *al, fl, var = SCM_CAR (vloc); | |
2783 | register SCM iloc = SCM_ILOC00; | |
2784 | for (; SCM_NIMP (env); env = SCM_CDR (env)) | |
2785 | { | |
a61f4e0c | 2786 | if (!scm_is_pair (SCM_CAR (env))) |
e5156567 DH |
2787 | break; |
2788 | al = SCM_CARLOC (env); | |
2789 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) | |
2790 | { | |
a61f4e0c | 2791 | if (!scm_is_pair (fl)) |
e5156567 | 2792 | { |
bc36d050 | 2793 | if (scm_is_eq (fl, var)) |
e5156567 | 2794 | { |
bc36d050 | 2795 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2796 | goto race; |
2797 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); | |
2798 | return SCM_CDRLOC (*al); | |
2799 | } | |
2800 | else | |
2801 | break; | |
2802 | } | |
2803 | al = SCM_CDRLOC (*al); | |
bc36d050 | 2804 | if (scm_is_eq (SCM_CAR (fl), var)) |
e5156567 DH |
2805 | { |
2806 | if (SCM_UNBNDP (SCM_CAR (*al))) | |
2d0c133f | 2807 | error_defined_variable (var); |
bc36d050 | 2808 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2809 | goto race; |
2810 | SCM_SETCAR (vloc, iloc); | |
2811 | return SCM_CARLOC (*al); | |
2812 | } | |
2813 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); | |
2814 | } | |
2815 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); | |
2816 | } | |
2817 | { | |
2818 | SCM top_thunk, real_var; | |
2819 | if (SCM_NIMP (env)) | |
2820 | { | |
2821 | top_thunk = SCM_CAR (env); /* env now refers to a | |
2822 | top level env thunk */ | |
2823 | env = SCM_CDR (env); | |
2824 | } | |
2825 | else | |
2826 | top_thunk = SCM_BOOL_F; | |
2827 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); | |
7888309b | 2828 | if (scm_is_false (real_var)) |
e5156567 DH |
2829 | goto errout; |
2830 | ||
a61f4e0c | 2831 | if (!scm_is_null (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
e5156567 DH |
2832 | { |
2833 | errout: | |
2834 | if (check) | |
2835 | { | |
a61f4e0c | 2836 | if (scm_is_null (env)) |
e5156567 DH |
2837 | error_unbound_variable (var); |
2838 | else | |
2839 | scm_misc_error (NULL, "Damaged environment: ~S", | |
2840 | scm_list_1 (var)); | |
2841 | } | |
2842 | else | |
2843 | { | |
2844 | /* A variable could not be found, but we shall | |
2845 | not throw an error. */ | |
2846 | static SCM undef_object = SCM_UNDEFINED; | |
2847 | return &undef_object; | |
2848 | } | |
2849 | } | |
2850 | ||
bc36d050 | 2851 | if (!scm_is_eq (SCM_CAR (vloc), var)) |
e5156567 DH |
2852 | { |
2853 | /* Some other thread has changed the very cell we are working | |
2854 | on. In effect, it must have done our job or messed it up | |
2855 | completely. */ | |
2856 | race: | |
2857 | var = SCM_CAR (vloc); | |
2858 | if (SCM_VARIABLEP (var)) | |
2859 | return SCM_VARIABLE_LOC (var); | |
2860 | if (SCM_ILOCP (var)) | |
2861 | return scm_ilookup (var, genv); | |
2862 | /* We can't cope with anything else than variables and ilocs. When | |
2863 | a special form has been memoized (i.e. `let' into `#@let') we | |
2864 | return NULL and expect the calling function to do the right | |
2865 | thing. For the evaluator, this means going back and redoing | |
2866 | the dispatch on the car of the form. */ | |
2867 | return NULL; | |
2868 | } | |
2869 | ||
2870 | SCM_SETCAR (vloc, real_var); | |
2871 | return SCM_VARIABLE_LOC (real_var); | |
2872 | } | |
2873 | } | |
2874 | ||
2875 | SCM * | |
2876 | scm_lookupcar (SCM vloc, SCM genv, int check) | |
2877 | { | |
2878 | SCM *loc = scm_lookupcar1 (vloc, genv, check); | |
2879 | if (loc == NULL) | |
2880 | abort (); | |
2881 | return loc; | |
2882 | } | |
2883 | ||
2884 | ||
36245b66 DH |
2885 | /* During execution, look up a symbol in the top level of the given local |
2886 | * environment and return the corresponding variable object. If no binding | |
2887 | * for the symbol can be found, an 'Unbound variable' error is signalled. */ | |
2888 | static SCM | |
2889 | lazy_memoize_variable (const SCM symbol, const SCM environment) | |
2890 | { | |
2891 | const SCM top_level = scm_env_top_level (environment); | |
2892 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
2893 | ||
7888309b | 2894 | if (scm_is_false (variable)) |
36245b66 DH |
2895 | error_unbound_variable (symbol); |
2896 | else | |
2897 | return variable; | |
2898 | } | |
2899 | ||
2900 | ||
62360b89 DH |
2901 | SCM |
2902 | scm_eval_car (SCM pair, SCM env) | |
2903 | { | |
385609b9 | 2904 | return SCM_I_XEVALCAR (pair, env); |
62360b89 DH |
2905 | } |
2906 | ||
2907 | ||
6dbd0af5 | 2908 | SCM |
6e8d25a6 | 2909 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2910 | { |
680ed4a8 | 2911 | SCM results = SCM_EOL, *lloc = &results, res; |
a61f4e0c | 2912 | while (scm_is_pair (l)) |
6dbd0af5 | 2913 | { |
680ed4a8 | 2914 | res = EVALCAR (l, env); |
904a077d | 2915 | |
8ea46249 | 2916 | *lloc = scm_list_1 (res); |
a23afe53 | 2917 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2918 | l = SCM_CDR (l); |
2919 | } | |
a61f4e0c | 2920 | if (!scm_is_null (l)) |
904a077d | 2921 | scm_wrong_num_args (proc); |
680ed4a8 | 2922 | return results; |
6dbd0af5 | 2923 | } |
c4ac4d88 | 2924 | |
d0b07b5d | 2925 | |
9de33deb MD |
2926 | SCM |
2927 | scm_eval_body (SCM code, SCM env) | |
2928 | { | |
2929 | SCM next; | |
434f2f7a | 2930 | |
9de33deb | 2931 | again: |
01f11e02 | 2932 | next = SCM_CDR (code); |
a61f4e0c | 2933 | while (!scm_is_null (next)) |
9de33deb MD |
2934 | { |
2935 | if (SCM_IMP (SCM_CAR (code))) | |
2936 | { | |
2937 | if (SCM_ISYMP (SCM_CAR (code))) | |
2938 | { | |
28d52ebb | 2939 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2940 | /* check for race condition */ |
2941 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2942 | m_expand_body (code, env); |
28d52ebb | 2943 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2944 | goto again; |
2945 | } | |
2946 | } | |
2947 | else | |
385609b9 | 2948 | SCM_I_XEVAL (SCM_CAR (code), env); |
9de33deb | 2949 | code = next; |
01f11e02 | 2950 | next = SCM_CDR (code); |
9de33deb | 2951 | } |
385609b9 | 2952 | return SCM_I_XEVALCAR (code, env); |
9de33deb MD |
2953 | } |
2954 | ||
0f2d19dd JB |
2955 | #endif /* !DEVAL */ |
2956 | ||
6dbd0af5 MD |
2957 | |
2958 | /* SECTION: This code is specific for the debugging support. One | |
2959 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2960 | * defined. | |
2961 | */ | |
2962 | ||
2963 | #ifndef DEVAL | |
2964 | ||
2965 | #define SCM_APPLY scm_apply | |
2966 | #define PREP_APPLY(proc, args) | |
2967 | #define ENTER_APPLY | |
ddea3325 | 2968 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2969 | #ifdef STACK_CHECKING |
2970 | #ifndef NO_CEVAL_STACK_CHECKING | |
2971 | #define EVAL_STACK_CHECKING | |
2972 | #endif | |
6dbd0af5 MD |
2973 | #endif |
2974 | ||
2975 | #else /* !DEVAL */ | |
2976 | ||
434f2f7a DH |
2977 | #undef CEVAL |
2978 | #define CEVAL deval /* Substitute all uses of ceval */ | |
2979 | ||
0f2d19dd JB |
2980 | #undef SCM_APPLY |
2981 | #define SCM_APPLY scm_dapply | |
434f2f7a | 2982 | |
6dbd0af5 MD |
2983 | #undef PREP_APPLY |
2984 | #define PREP_APPLY(p, l) \ | |
2985 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
434f2f7a | 2986 | |
6dbd0af5 MD |
2987 | #undef ENTER_APPLY |
2988 | #define ENTER_APPLY \ | |
d3a6bc94 | 2989 | do { \ |
b7ff98dd | 2990 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2991 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2992 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2993 | {\ |
7888309b | 2994 | SCM tmp, tail = scm_from_bool(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2995 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2996 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2997 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2998 | {\ |
c0ab1b8d | 2999 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 3000 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 3001 | }\ |
6dbd0af5 MD |
3002 | else\ |
3003 | {\ | |
5f144b10 GH |
3004 | int first;\ |
3005 | tmp = scm_make_continuation (&first);\ | |
3006 | if (first)\ | |
d95c0b76 | 3007 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 3008 | }\ |
d95c0b76 | 3009 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 3010 | }\ |
d3a6bc94 | 3011 | } while (0) |
434f2f7a | 3012 | |
0f2d19dd | 3013 | #undef RETURN |
ddea3325 | 3014 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
434f2f7a | 3015 | |
b7ff98dd MD |
3016 | #ifdef STACK_CHECKING |
3017 | #ifndef EVAL_STACK_CHECKING | |
3018 | #define EVAL_STACK_CHECKING | |
3019 | #endif | |
6dbd0af5 MD |
3020 | #endif |
3021 | ||
0f2d19dd | 3022 | |
434f2f7a DH |
3023 | /* scm_last_debug_frame contains a pointer to the last debugging information |
3024 | * stack frame. It is accessed very often from the debugging evaluator, so it | |
3025 | * should probably not be indirectly addressed. Better to save and restore it | |
3026 | * from the current root at any stack swaps. | |
6dbd0af5 MD |
3027 | */ |
3028 | ||
6dbd0af5 MD |
3029 | /* scm_debug_eframe_size is the number of slots available for pseudo |
3030 | * stack frames at each real stack frame. | |
3031 | */ | |
3032 | ||
c014a02e | 3033 | long scm_debug_eframe_size; |
6dbd0af5 | 3034 | |
434f2f7a DH |
3035 | int scm_debug_mode_p; |
3036 | int scm_check_entry_p; | |
3037 | int scm_check_apply_p; | |
3038 | int scm_check_exit_p; | |
6dbd0af5 | 3039 | |
c014a02e | 3040 | long scm_eval_stack; |
a74145b8 | 3041 | |
92c2555f | 3042 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 3043 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
3044 | }; |
3045 | ||
92c2555f | 3046 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
3047 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
3048 | "*Flyweight representation of the stack at traps." }, | |
3049 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
3050 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
3051 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
3052 | "Record procedure names at definition." }, | |
3053 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
3054 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 3055 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
3056 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
3057 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 3058 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
3059 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
3060 | "Maximal number of stored backtrace frames." }, | |
3061 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
3062 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
3063 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 3064 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 3065 | { SCM_OPTION_SCM, "show-file-name", (unsigned long)SCM_BOOL_T, "Show file names and line numbers in backtraces when not `#f'. A value of `base' displays only base names, while `#t' displays full names."} |
6dbd0af5 MD |
3066 | }; |
3067 | ||
92c2555f | 3068 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 3069 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
3070 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
3071 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
3072 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
3073 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
3074 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
3075 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
3076 | }; |
3077 | ||
a1ec6916 | 3078 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 3079 | (SCM setting), |
b3f26b14 MG |
3080 | "Option interface for the evaluation options. Instead of using\n" |
3081 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 3082 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 3083 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
3084 | { |
3085 | SCM ans; | |
3086 | SCM_DEFER_INTS; | |
3087 | ans = scm_options (setting, | |
3088 | scm_eval_opts, | |
3089 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 3090 | FUNC_NAME); |
a74145b8 | 3091 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
3092 | SCM_ALLOW_INTS; |
3093 | return ans; | |
3094 | } | |
1bbd0b84 | 3095 | #undef FUNC_NAME |
33b97402 | 3096 | |
d0b07b5d | 3097 | |
a1ec6916 | 3098 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 3099 | (SCM setting), |
b3f26b14 | 3100 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 3101 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
3102 | { |
3103 | SCM ans; | |
3104 | SCM_DEFER_INTS; | |
3105 | ans = scm_options (setting, | |
3106 | scm_evaluator_trap_table, | |
3107 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 3108 | FUNC_NAME); |
33b97402 | 3109 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 3110 | SCM_ALLOW_INTS; |
33b97402 MD |
3111 | return ans; |
3112 | } | |
1bbd0b84 | 3113 | #undef FUNC_NAME |
33b97402 | 3114 | |
d0b07b5d | 3115 | |
24933780 | 3116 | static SCM |
a392ee15 | 3117 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 3118 | { |
b1cb24ff | 3119 | SCM *results = lloc; |
a61f4e0c | 3120 | while (scm_is_pair (l)) |
0f2d19dd | 3121 | { |
b1cb24ff | 3122 | const SCM res = EVALCAR (l, env); |
904a077d | 3123 | |
8ea46249 | 3124 | *lloc = scm_list_1 (res); |
a23afe53 | 3125 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
3126 | l = SCM_CDR (l); |
3127 | } | |
a61f4e0c | 3128 | if (!scm_is_null (l)) |
904a077d | 3129 | scm_wrong_num_args (proc); |
680ed4a8 | 3130 | return *results; |
0f2d19dd JB |
3131 | } |
3132 | ||
6dbd0af5 MD |
3133 | #endif /* !DEVAL */ |
3134 | ||
3135 | ||
a392ee15 | 3136 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
3137 | */ |
3138 | ||
a392ee15 | 3139 | |
d9d39d76 | 3140 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 3141 | * current module. */ |
d9d39d76 MV |
3142 | #define UPDATE_TOPLEVEL_ENV(env) \ |
3143 | do { \ | |
3144 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 3145 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
3146 | env = scm_top_level_env (p); \ |
3147 | } while (0) | |
3148 | ||
6dbd0af5 | 3149 | |
6f81708a | 3150 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
bc36d050 | 3151 | ASSERT_SYNTAX (!scm_is_eq ((x), SCM_EOL), s_empty_combination, x) |
6f81708a DH |
3152 | |
3153 | ||
a392ee15 DH |
3154 | /* This is the evaluator. Like any real monster, it has three heads: |
3155 | * | |
434f2f7a DH |
3156 | * ceval is the non-debugging evaluator, deval is the debugging version. Both |
3157 | * are implemented using a common code base, using the following mechanism: | |
3158 | * CEVAL is a macro, which is either defined to ceval or deval. Thus, there | |
3159 | * is no function CEVAL, but the code for CEVAL actually compiles to either | |
3160 | * ceval or deval. When CEVAL is defined to ceval, it is known that the macro | |
3161 | * DEVAL is not defined. When CEVAL is defined to deval, then the macro DEVAL | |
3162 | * is known to be defined. Thus, in CEVAL parts for the debugging evaluator | |
a392ee15 DH |
3163 | * are enclosed within #ifdef DEVAL ... #endif. |
3164 | * | |
434f2f7a DH |
3165 | * All three (ceval, deval and their common implementation CEVAL) take two |
3166 | * input parameters, x and env: x is a single expression to be evalutated. | |
3167 | * env is the environment in which bindings are searched. | |
a392ee15 | 3168 | * |
434f2f7a DH |
3169 | * x is known to be a pair. Since x is a single expression, it is necessarily |
3170 | * in a tail position. If x is just a call to another function like in the | |
3171 | * expression (foo exp1 exp2 ...), the realization of that call therefore | |
3172 | * _must_not_ increase stack usage (the evaluation of exp1, exp2 etc., | |
3173 | * however, may do so). This is realized by making extensive use of 'goto' | |
3174 | * statements within the evaluator: The gotos replace recursive calls to | |
3175 | * CEVAL, thus re-using the same stack frame that CEVAL was already using. | |
3176 | * If, however, x represents some form that requires to evaluate a sequence of | |
3177 | * expressions like (begin exp1 exp2 ...), then recursive calls to CEVAL are | |
3178 | * performed for all but the last expression of that sequence. */ | |
6dbd0af5 | 3179 | |
434f2f7a DH |
3180 | static SCM |
3181 | CEVAL (SCM x, SCM env) | |
0f2d19dd | 3182 | { |
42030fb2 | 3183 | SCM proc, arg1; |
6dbd0af5 | 3184 | #ifdef DEVAL |
92c2555f MV |
3185 | scm_t_debug_frame debug; |
3186 | scm_t_debug_info *debug_info_end; | |
1646d37b | 3187 | debug.prev = scm_last_debug_frame; |
020c890c | 3188 | debug.status = 0; |
04b6c081 | 3189 | /* |
92c2555f | 3190 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
3191 | * user has specified with (debug-set! frames <n>). |
3192 | * | |
3193 | * Even frames are eval frames, odd frames are apply frames. | |
3194 | */ | |
92c2555f | 3195 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 3196 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
3197 | debug.info = debug.vect; |
3198 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
3199 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 3200 | #endif |
b7ff98dd | 3201 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 3202 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 3203 | { |
b7ff98dd | 3204 | #ifdef DEVAL |
6dbd0af5 MD |
3205 | debug.info->e.exp = x; |
3206 | debug.info->e.env = env; | |
b7ff98dd | 3207 | #endif |
6dbd0af5 MD |
3208 | scm_report_stack_overflow (); |
3209 | } | |
3210 | #endif | |
6a0f6ff3 | 3211 | |
6dbd0af5 MD |
3212 | #ifdef DEVAL |
3213 | goto start; | |
3214 | #endif | |
6a0f6ff3 | 3215 | |
6dbd0af5 MD |
3216 | loop: |
3217 | #ifdef DEVAL | |
b7ff98dd MD |
3218 | SCM_CLEAR_ARGSREADY (debug); |
3219 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 3220 | --debug.info; |
04b6c081 MD |
3221 | /* |
3222 | * In theory, this should be the only place where it is necessary to | |
3223 | * check for space in debug.vect since both eval frames and | |
3224 | * available space are even. | |
3225 | * | |
3226 | * For this to be the case, however, it is necessary that primitive | |
3227 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 3228 | * label call PREP_APPLY. |
04b6c081 | 3229 | */ |
c0ab1b8d | 3230 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 3231 | { |
b7ff98dd | 3232 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
3233 | debug.info -= 2; |
3234 | } | |
6a0f6ff3 | 3235 | |
6dbd0af5 MD |
3236 | start: |
3237 | debug.info->e.exp = x; | |
3238 | debug.info->e.env = env; | |
5132eef0 DH |
3239 | if (scm_check_entry_p && SCM_TRAPS_P) |
3240 | { | |
bc76d628 DH |
3241 | if (SCM_ENTER_FRAME_P |
3242 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 3243 | { |
bc76d628 | 3244 | SCM stackrep; |
7888309b | 3245 | SCM tail = scm_from_bool (SCM_TAILRECP (debug)); |
5132eef0 DH |
3246 | SCM_SET_TAILREC (debug); |
3247 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 3248 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
3249 | else |
3250 | { | |
3251 | int first; | |
3252 | SCM val = scm_make_continuation (&first); | |
3253 | ||
3254 | if (first) | |
bc76d628 | 3255 | stackrep = val; |
5132eef0 DH |
3256 | else |
3257 | { | |
3258 | x = val; | |
3259 | if (SCM_IMP (x)) | |
3260 | RETURN (x); | |
3261 | else | |
3262 | /* This gives the possibility for the debugger to | |
3263 | modify the source expression before evaluation. */ | |
3264 | goto dispatch; | |
3265 | } | |
3266 | } | |
3267 | SCM_TRAPS_P = 0; | |
3268 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
3269 | scm_sym_enter_frame, | |
bc76d628 | 3270 | stackrep, |
5132eef0 | 3271 | tail, |
212e58ed | 3272 | unmemoize_expression (x, env)); |
5132eef0 DH |
3273 | SCM_TRAPS_P = 1; |
3274 | } | |
3275 | } | |
6dbd0af5 | 3276 | #endif |
f8769b1d | 3277 | dispatch: |
9cb5124f | 3278 | SCM_TICK; |
dec40cd2 | 3279 | if (SCM_ISYMP (SCM_CAR (x))) |
0f2d19dd | 3280 | { |
7e6e6b37 | 3281 | switch (ISYMNUM (SCM_CAR (x))) |
dec40cd2 | 3282 | { |
7e6e6b37 | 3283 | case (ISYMNUM (SCM_IM_AND)): |
dec40cd2 | 3284 | x = SCM_CDR (x); |
a61f4e0c | 3285 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3286 | { |
3287 | SCM test_result = EVALCAR (x, env); | |
7888309b | 3288 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3289 | RETURN (SCM_BOOL_F); |
3290 | else | |
3291 | x = SCM_CDR (x); | |
3292 | } | |
3293 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3294 | goto carloop; | |
0f2d19dd | 3295 | |
7e6e6b37 | 3296 | case (ISYMNUM (SCM_IM_BEGIN)): |
dec40cd2 | 3297 | x = SCM_CDR (x); |
a61f4e0c | 3298 | if (scm_is_null (x)) |
dec40cd2 | 3299 | RETURN (SCM_UNSPECIFIED); |
b8113bc8 | 3300 | |
dec40cd2 | 3301 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd | 3302 | |
dec40cd2 DH |
3303 | begin: |
3304 | /* If we are on toplevel with a lookup closure, we need to sync | |
3305 | with the current module. */ | |
a61f4e0c | 3306 | if (scm_is_pair (env) && !scm_is_pair (SCM_CAR (env))) |
dec40cd2 DH |
3307 | { |
3308 | UPDATE_TOPLEVEL_ENV (env); | |
a61f4e0c | 3309 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3310 | { |
3311 | EVALCAR (x, env); | |
3312 | UPDATE_TOPLEVEL_ENV (env); | |
3313 | x = SCM_CDR (x); | |
3314 | } | |
3315 | goto carloop; | |
3316 | } | |
3317 | else | |
3318 | goto nontoplevel_begin; | |
5280aaca | 3319 | |
dec40cd2 | 3320 | nontoplevel_begin: |
a61f4e0c | 3321 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 | 3322 | { |
b1cb24ff | 3323 | const SCM form = SCM_CAR (x); |
dec40cd2 DH |
3324 | if (SCM_IMP (form)) |
3325 | { | |
3326 | if (SCM_ISYMP (form)) | |
3327 | { | |
3328 | scm_rec_mutex_lock (&source_mutex); | |
3329 | /* check for race condition */ | |
3330 | if (SCM_ISYMP (SCM_CAR (x))) | |
3331 | m_expand_body (x, env); | |
3332 | scm_rec_mutex_unlock (&source_mutex); | |
3333 | goto nontoplevel_begin; | |
3334 | } | |
3335 | else | |
3336 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); | |
3337 | } | |
3338 | else | |
b1cb24ff | 3339 | (void) EVAL (form, env); |
dec40cd2 DH |
3340 | x = SCM_CDR (x); |
3341 | } | |
b1cb24ff | 3342 | |
dec40cd2 DH |
3343 | carloop: |
3344 | { | |
3345 | /* scm_eval last form in list */ | |
b1cb24ff | 3346 | const SCM last_form = SCM_CAR (x); |
0f2d19dd | 3347 | |
a61f4e0c | 3348 | if (scm_is_pair (last_form)) |
dec40cd2 DH |
3349 | { |
3350 | /* This is by far the most frequent case. */ | |
3351 | x = last_form; | |
3352 | goto loop; /* tail recurse */ | |
3353 | } | |
3354 | else if (SCM_IMP (last_form)) | |
385609b9 | 3355 | RETURN (SCM_I_EVALIM (last_form, env)); |
dec40cd2 DH |
3356 | else if (SCM_VARIABLEP (last_form)) |
3357 | RETURN (SCM_VARIABLE_REF (last_form)); | |
cc95e00a | 3358 | else if (scm_is_symbol (last_form)) |
dec40cd2 DH |
3359 | RETURN (*scm_lookupcar (x, env, 1)); |
3360 | else | |
3361 | RETURN (last_form); | |
3362 | } | |
0f2d19dd JB |
3363 | |
3364 | ||
7e6e6b37 | 3365 | case (ISYMNUM (SCM_IM_CASE)): |
dec40cd2 DH |
3366 | x = SCM_CDR (x); |
3367 | { | |
b1cb24ff | 3368 | const SCM key = EVALCAR (x, env); |
dec40cd2 | 3369 | x = SCM_CDR (x); |
a61f4e0c | 3370 | while (!scm_is_null (x)) |
dec40cd2 | 3371 | { |
b1cb24ff | 3372 | const SCM clause = SCM_CAR (x); |
dec40cd2 | 3373 | SCM labels = SCM_CAR (clause); |
bc36d050 | 3374 | if (scm_is_eq (labels, SCM_IM_ELSE)) |
dec40cd2 DH |
3375 | { |
3376 | x = SCM_CDR (clause); | |
3377 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3378 | goto begin; | |
3379 | } | |
a61f4e0c | 3380 | while (!scm_is_null (labels)) |
dec40cd2 | 3381 | { |
b1cb24ff | 3382 | const SCM label = SCM_CAR (labels); |
bc36d050 | 3383 | if (scm_is_eq (label, key) |
7888309b | 3384 | || scm_is_true (scm_eqv_p (label, key))) |
dec40cd2 DH |
3385 | { |
3386 | x = SCM_CDR (clause); | |
3387 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3388 | goto begin; | |
3389 | } | |
3390 | labels = SCM_CDR (labels); | |
3391 | } | |
3392 | x = SCM_CDR (x); | |
3393 | } | |
3394 | } | |
3395 | RETURN (SCM_UNSPECIFIED); | |
0f2d19dd JB |
3396 | |
3397 | ||
7e6e6b37 | 3398 | case (ISYMNUM (SCM_IM_COND)): |
dec40cd2 | 3399 | x = SCM_CDR (x); |
a61f4e0c | 3400 | while (!scm_is_null (x)) |
dec40cd2 | 3401 | { |
b1cb24ff | 3402 | const SCM clause = SCM_CAR (x); |
bc36d050 | 3403 | if (scm_is_eq (SCM_CAR (clause), SCM_IM_ELSE)) |
dec40cd2 DH |
3404 | { |
3405 | x = SCM_CDR (clause); | |
3406 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3407 | goto begin; | |
3408 | } | |
3409 | else | |
3410 | { | |
3411 | arg1 = EVALCAR (clause, env); | |
7888309b | 3412 | if (scm_is_true (arg1) && !SCM_NILP (arg1)) |
dec40cd2 DH |
3413 | { |
3414 | x = SCM_CDR (clause); | |
a61f4e0c | 3415 | if (scm_is_null (x)) |
dec40cd2 | 3416 | RETURN (arg1); |
bc36d050 | 3417 | else if (!scm_is_eq (SCM_CAR (x), SCM_IM_ARROW)) |
dec40cd2 DH |
3418 | { |
3419 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3420 | goto begin; | |
3421 | } | |
3422 | else | |
3423 | { | |
3424 | proc = SCM_CDR (x); | |
3425 | proc = EVALCAR (proc, env); | |
3426 | PREP_APPLY (proc, scm_list_1 (arg1)); | |
3427 | ENTER_APPLY; | |
3428 | goto evap1; | |
3429 | } | |
3430 | } | |
3431 | x = SCM_CDR (x); | |
3432 | } | |
3433 | } | |
3434 | RETURN (SCM_UNSPECIFIED); | |
e5cb71a0 | 3435 | |
e5cb71a0 | 3436 | |
7e6e6b37 | 3437 | case (ISYMNUM (SCM_IM_DO)): |
dec40cd2 DH |
3438 | x = SCM_CDR (x); |
3439 | { | |
3440 | /* Compute the initialization values and the initial environment. */ | |
3441 | SCM init_forms = SCM_CAR (x); | |
3442 | SCM init_values = SCM_EOL; | |
a61f4e0c | 3443 | while (!scm_is_null (init_forms)) |
dec40cd2 DH |
3444 | { |
3445 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3446 | init_forms = SCM_CDR (init_forms); | |
3447 | } | |
3448 | x = SCM_CDR (x); | |
3449 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3450 | } | |
3451 | x = SCM_CDR (x); | |
3452 | { | |
3453 | SCM test_form = SCM_CAR (x); | |
3454 | SCM body_forms = SCM_CADR (x); | |
3455 | SCM step_forms = SCM_CDDR (x); | |
e5cb71a0 | 3456 | |
dec40cd2 | 3457 | SCM test_result = EVALCAR (test_form, env); |
e5cb71a0 | 3458 | |
7888309b | 3459 | while (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3460 | { |
3461 | { | |
3462 | /* Evaluate body forms. */ | |
3463 | SCM temp_forms; | |
3464 | for (temp_forms = body_forms; | |
a61f4e0c | 3465 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3466 | temp_forms = SCM_CDR (temp_forms)) |
3467 | { | |
3468 | SCM form = SCM_CAR (temp_forms); | |
b1cb24ff DH |
3469 | /* Dirk:FIXME: We only need to eval forms that may have |
3470 | * a side effect here. This is only true for forms that | |
3471 | * start with a pair. All others are just constants. | |
3472 | * Since with the current memoizer 'form' may hold a | |
3473 | * constant, we call EVAL here to handle the constant | |
3474 | * cases. In the long run it would make sense to have | |
3475 | * the macro transformer of 'do' eliminate all forms | |
3476 | * that have no sideeffect. Then instead of EVAL we | |
3477 | * could call CEVAL directly here. */ | |
3478 | (void) EVAL (form, env); | |
dec40cd2 DH |
3479 | } |
3480 | } | |
0f2d19dd | 3481 | |
dec40cd2 DH |
3482 | { |
3483 | /* Evaluate the step expressions. */ | |
3484 | SCM temp_forms; | |
3485 | SCM step_values = SCM_EOL; | |
3486 | for (temp_forms = step_forms; | |
a61f4e0c | 3487 | !scm_is_null (temp_forms); |
dec40cd2 DH |
3488 | temp_forms = SCM_CDR (temp_forms)) |
3489 | { | |
b1cb24ff | 3490 | const SCM value = EVALCAR (temp_forms, env); |
dec40cd2 DH |
3491 | step_values = scm_cons (value, step_values); |
3492 | } | |
3493 | env = SCM_EXTEND_ENV (SCM_CAAR (env), | |
3494 | step_values, | |
3495 | SCM_CDR (env)); | |
3496 | } | |
0f2d19dd | 3497 | |
dec40cd2 DH |
3498 | test_result = EVALCAR (test_form, env); |
3499 | } | |
3500 | } | |
3501 | x = SCM_CDAR (x); | |
a61f4e0c | 3502 | if (scm_is_null (x)) |
dec40cd2 DH |
3503 | RETURN (SCM_UNSPECIFIED); |
3504 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3505 | goto nontoplevel_begin; | |
0f2d19dd JB |
3506 | |
3507 | ||
7e6e6b37 | 3508 | case (ISYMNUM (SCM_IM_IF)): |
dec40cd2 DH |
3509 | x = SCM_CDR (x); |
3510 | { | |
3511 | SCM test_result = EVALCAR (x, env); | |
3512 | x = SCM_CDR (x); /* then expression */ | |
7888309b | 3513 | if (scm_is_false (test_result) || SCM_NILP (test_result)) |
dec40cd2 DH |
3514 | { |
3515 | x = SCM_CDR (x); /* else expression */ | |
a61f4e0c | 3516 | if (scm_is_null (x)) |
dec40cd2 DH |
3517 | RETURN (SCM_UNSPECIFIED); |
3518 | } | |
3519 | } | |
3520 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3521 | goto carloop; | |
0f2d19dd JB |
3522 | |
3523 | ||
7e6e6b37 | 3524 | case (ISYMNUM (SCM_IM_LET)): |
dec40cd2 DH |
3525 | x = SCM_CDR (x); |
3526 | { | |
3527 | SCM init_forms = SCM_CADR (x); | |
3528 | SCM init_values = SCM_EOL; | |
3529 | do | |
3530 | { | |
3531 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3532 | init_forms = SCM_CDR (init_forms); | |
3533 | } | |
a61f4e0c | 3534 | while (!scm_is_null (init_forms)); |
dec40cd2 DH |
3535 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
3536 | } | |
3537 | x = SCM_CDDR (x); | |
3538 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3539 | goto nontoplevel_begin; | |
0f2d19dd JB |
3540 | |
3541 | ||
7e6e6b37 | 3542 | case (ISYMNUM (SCM_IM_LETREC)): |
dec40cd2 DH |
3543 | x = SCM_CDR (x); |
3544 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); | |
3545 | x = SCM_CDR (x); | |
3546 | { | |
3547 | SCM init_forms = SCM_CAR (x); | |
3548 | SCM init_values = SCM_EOL; | |
3549 | do | |
3550 | { | |
3551 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3552 | init_forms = SCM_CDR (init_forms); | |
3553 | } | |
a61f4e0c | 3554 | while (!scm_is_null (init_forms)); |
dec40cd2 DH |
3555 | SCM_SETCDR (SCM_CAR (env), init_values); |
3556 | } | |
3557 | x = SCM_CDR (x); | |
3558 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3559 | goto nontoplevel_begin; | |
0f2d19dd | 3560 | |
302c12b4 | 3561 | |
7e6e6b37 | 3562 | case (ISYMNUM (SCM_IM_LETSTAR)): |
dec40cd2 DH |
3563 | x = SCM_CDR (x); |
3564 | { | |
3565 | SCM bindings = SCM_CAR (x); | |
a61f4e0c | 3566 | if (!scm_is_null (bindings)) |
dec40cd2 DH |
3567 | { |
3568 | do | |
3569 | { | |
3570 | SCM name = SCM_CAR (bindings); | |
3571 | SCM init = SCM_CDR (bindings); | |
3572 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); | |
3573 | bindings = SCM_CDR (init); | |
3574 | } | |
a61f4e0c | 3575 | while (!scm_is_null (bindings)); |
dec40cd2 DH |
3576 | } |
3577 | } | |
3578 | x = SCM_CDR (x); | |
3579 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3580 | goto nontoplevel_begin; | |
0f2d19dd JB |
3581 | |
3582 | ||
7e6e6b37 | 3583 | case (ISYMNUM (SCM_IM_OR)): |
dec40cd2 | 3584 | x = SCM_CDR (x); |
a61f4e0c | 3585 | while (!scm_is_null (SCM_CDR (x))) |
dec40cd2 DH |
3586 | { |
3587 | SCM val = EVALCAR (x, env); | |
7888309b | 3588 | if (scm_is_true (val) && !SCM_NILP (val)) |
dec40cd2 DH |
3589 | RETURN (val); |
3590 | else | |
3591 | x = SCM_CDR (x); | |
3592 | } | |
3593 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3594 | goto carloop; | |
0f2d19dd JB |
3595 | |
3596 | ||
7e6e6b37 | 3597 | case (ISYMNUM (SCM_IM_LAMBDA)): |
dec40cd2 | 3598 | RETURN (scm_closure (SCM_CDR (x), env)); |
0f2d19dd JB |
3599 | |
3600 | ||
7e6e6b37 | 3601 | case (ISYMNUM (SCM_IM_QUOTE)): |
e7313a9d | 3602 | RETURN (SCM_CDR (x)); |
0f2d19dd JB |
3603 | |
3604 | ||
7e6e6b37 | 3605 | case (ISYMNUM (SCM_IM_SET_X)): |
dec40cd2 DH |
3606 | x = SCM_CDR (x); |
3607 | { | |
3608 | SCM *location; | |
3609 | SCM variable = SCM_CAR (x); | |
3610 | if (SCM_ILOCP (variable)) | |
3611 | location = scm_ilookup (variable, env); | |
3612 | else if (SCM_VARIABLEP (variable)) | |
3613 | location = SCM_VARIABLE_LOC (variable); | |
36245b66 DH |
3614 | else |
3615 | { | |
cc95e00a | 3616 | /* (scm_is_symbol (variable)) is known to be true */ |
36245b66 DH |
3617 | variable = lazy_memoize_variable (variable, env); |
3618 | SCM_SETCAR (x, variable); | |
3619 | location = SCM_VARIABLE_LOC (variable); | |
3620 | } | |
dec40cd2 DH |
3621 | x = SCM_CDR (x); |
3622 | *location = EVALCAR (x, env); | |
3623 | } | |
3624 | RETURN (SCM_UNSPECIFIED); | |
3f04400d DH |
3625 | |
3626 | ||
7e6e6b37 | 3627 | case (ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3628 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3629 | x = SCM_CDR (x); |
3630 | proc = EVALCAR (x, env); | |
3631 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3632 | |
3633 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3634 | x = SCM_CDR (x); |
3635 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3636 | |
3637 | apply_proc: | |
3638 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3639 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3640 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3641 | if (SCM_CLOSUREP (proc)) |
3642 | { | |
9a069bdd | 3643 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3644 | #ifdef DEVAL |
9a069bdd | 3645 | debug.info->a.args = arg1; |
6dbd0af5 | 3646 | #endif |
9a069bdd DH |
3647 | if (scm_badargsp (formals, arg1)) |
3648 | scm_wrong_num_args (proc); | |
3649 | ENTER_APPLY; | |
3650 | /* Copy argument list */ | |
3651 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3652 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3653 | else | |
3654 | { | |
3655 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3656 | SCM tail = args; | |
3657 | arg1 = SCM_CDR (arg1); | |
3658 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3659 | { | |
3660 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3661 | SCM_SETCDR (tail, new_tail); | |
3662 | tail = new_tail; | |
3663 | arg1 = SCM_CDR (arg1); | |
3664 | } | |
3665 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3666 | } | |
3667 | ||
3668 | x = SCM_CLOSURE_BODY (proc); | |
3669 | goto nontoplevel_begin; | |
0f2d19dd | 3670 | } |
3f04400d DH |
3671 | else |
3672 | { | |
e910e9d2 DH |
3673 | ENTER_APPLY; |
3674 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3675 | } |
3676 | ||
0f2d19dd | 3677 | |
7e6e6b37 | 3678 | case (ISYMNUM (SCM_IM_CONT)): |
5f144b10 GH |
3679 | { |
3680 | int first; | |
3681 | SCM val = scm_make_continuation (&first); | |
3682 | ||
e050d4f8 | 3683 | if (!first) |
5f144b10 | 3684 | RETURN (val); |
e050d4f8 DH |
3685 | else |
3686 | { | |
3687 | arg1 = val; | |
3688 | proc = SCM_CDR (x); | |
6bff1368 | 3689 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3690 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3691 | ENTER_APPLY; | |
e050d4f8 DH |
3692 | goto evap1; |
3693 | } | |
5f144b10 | 3694 | } |
e050d4f8 | 3695 | |
0f2d19dd | 3696 | |
7e6e6b37 | 3697 | case (ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3698 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3699 | |
e050d4f8 | 3700 | |
7e6e6b37 | 3701 | case (ISYMNUM (SCM_IM_FUTURE)): |
28d52ebb MD |
3702 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); |
3703 | ||
3704 | ||
7e6e6b37 DH |
3705 | /* PLACEHOLDER for case (ISYMNUM (SCM_IM_DISPATCH)): The following |
3706 | code (type_dispatch) is intended to be the tail of the case | |
3707 | clause for the internal macro SCM_IM_DISPATCH. Please don't | |
3708 | remove it from this location without discussing it with Mikael | |
c8e1d354 MD |
3709 | <djurfeldt@nada.kth.se> */ |
3710 | ||
f12745b6 DH |
3711 | /* The type dispatch code is duplicated below |
3712 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3713 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3714 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3715 | /* Type dispatch means to determine from the types of the function |
3716 | * arguments (i. e. the 'signature' of the call), which method from | |
3717 | * a generic function is to be called. This process of selecting | |
3718 | * the right method takes some time. To speed it up, guile uses | |
3719 | * caching: Together with the macro call to dispatch the signatures | |
3720 | * of some previous calls to that generic function from the same | |
3721 | * place are stored (in the code!) in a cache that we call the | |
3722 | * 'method cache'. This is done since it is likely, that | |
3723 | * consecutive calls to dispatch from that position in the code will | |
3724 | * have the same signature. Thus, the type dispatch works as | |
3725 | * follows: First, determine a hash value from the signature of the | |
3726 | * actual arguments. Second, use this hash value as an index to | |
3727 | * find that same signature in the method cache stored at this | |
3728 | * position in the code. If found, you have also found the | |
3729 | * corresponding method that belongs to that signature. If the | |
3730 | * signature is not found in the method cache, you have to perform a | |
3731 | * full search over all signatures stored with the generic | |
3732 | * function. */ | |
3733 | { | |
3734 | unsigned long int specializers; | |
3735 | unsigned long int hash_value; | |
3736 | unsigned long int cache_end_pos; | |
3737 | unsigned long int mask; | |
3738 | SCM method_cache; | |
3739 | ||
3740 | { | |
3741 | SCM z = SCM_CDDR (x); | |
3742 | SCM tmp = SCM_CADR (z); | |
e11e83f3 | 3743 | specializers = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3744 | |
3745 | /* Compute a hash value for searching the method cache. There | |
3746 | * are two variants for computing the hash value, a (rather) | |
3747 | * complicated one, and a simple one. For the complicated one | |
3748 | * explained below, tmp holds a number that is used in the | |
3749 | * computation. */ | |
4057a3e0 | 3750 | if (scm_is_simple_vector (tmp)) |
e11e83f3 MV |
3751 | { |
3752 | /* This method of determining the hash value is much | |
3753 | * simpler: Set the hash value to zero and just perform a | |
3754 | * linear search through the method cache. */ | |
3755 | method_cache = tmp; | |
3756 | mask = (unsigned long int) ((long) -1); | |
3757 | hash_value = 0; | |
4057a3e0 | 3758 | cache_end_pos = SCM_SIMPLE_VECTOR_LENGTH (method_cache); |
e11e83f3 MV |
3759 | } |
3760 | else | |
f12745b6 DH |
3761 | { |
3762 | /* Use the signature of the actual arguments to determine | |
3763 | * the hash value. This is done as follows: Each class has | |
3764 | * an array of random numbers, that are determined when the | |
3765 | * class is created. The integer 'hashset' is an index into | |
3766 | * that array of random numbers. Now, from all classes that | |
3767 | * are part of the signature of the actual arguments, the | |
3768 | * random numbers at index 'hashset' are taken and summed | |
3769 | * up, giving the hash value. The value of 'hashset' is | |
3770 | * stored at the call to dispatch. This allows to have | |
3771 | * different 'formulas' for calculating the hash value at | |
3772 | * different places where dispatch is called. This allows | |
3773 | * to optimize the hash formula at every individual place | |
3774 | * where dispatch is called, such that hopefully the hash | |
3775 | * value that is computed will directly point to the right | |
3776 | * method in the method cache. */ | |
e11e83f3 | 3777 | unsigned long int hashset = scm_to_ulong (tmp); |
f12745b6 | 3778 | unsigned long int counter = specializers + 1; |
dff98306 | 3779 | SCM tmp_arg = arg1; |
f12745b6 | 3780 | hash_value = 0; |
a61f4e0c | 3781 | while (!scm_is_null (tmp_arg) && counter != 0) |
61364ba6 | 3782 | { |
f12745b6 DH |
3783 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3784 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3785 | tmp_arg = SCM_CDR (tmp_arg); | |
3786 | counter--; | |
61364ba6 | 3787 | } |
f12745b6 DH |
3788 | z = SCM_CDDR (z); |
3789 | method_cache = SCM_CADR (z); | |
e11e83f3 | 3790 | mask = scm_to_ulong (SCM_CAR (z)); |
f12745b6 DH |
3791 | hash_value &= mask; |
3792 | cache_end_pos = hash_value; | |
3793 | } | |
f12745b6 | 3794 | } |
61364ba6 | 3795 | |
f12745b6 DH |
3796 | { |
3797 | /* Search the method cache for a method with a matching | |
3798 | * signature. Start the search at position 'hash_value'. The | |
3799 | * hashing implementation uses linear probing for conflict | |
3800 | * resolution, that is, if the signature in question is not | |
3801 | * found at the starting index in the hash table, the next table | |
3802 | * entry is tried, and so on, until in the worst case the whole | |
3803 | * cache has been searched, but still the signature has not been | |
3804 | * found. */ | |
3805 | SCM z; | |
3806 | do | |
3807 | { | |
dff98306 | 3808 | SCM args = arg1; /* list of arguments */ |
4057a3e0 | 3809 | z = SCM_SIMPLE_VECTOR_REF (method_cache, hash_value); |
a61f4e0c | 3810 | while (!scm_is_null (args)) |
61364ba6 MD |
3811 | { |
3812 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 | 3813 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
bc36d050 | 3814 | if (!scm_is_eq (class_of_arg, SCM_CAR (z))) |
61364ba6 | 3815 | goto next_method; |
f12745b6 | 3816 | args = SCM_CDR (args); |
61364ba6 MD |
3817 | z = SCM_CDR (z); |
3818 | } | |
f12745b6 | 3819 | /* Fewer arguments than specifiers => CAR != ENV */ |
a61f4e0c | 3820 | if (scm_is_null (SCM_CAR (z)) || scm_is_pair (SCM_CAR (z))) |
f12745b6 DH |
3821 | goto apply_cmethod; |
3822 | next_method: | |
3823 | hash_value = (hash_value + 1) & mask; | |
3824 | } while (hash_value != cache_end_pos); | |
3825 | ||
3826 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3827 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3828 | |
dff98306 | 3829 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3830 | { |
3831 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3832 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3833 | x = SCM_CMETHOD_BODY (z); |
3834 | goto nontoplevel_begin; | |
3835 | } | |
3836 | } | |
61364ba6 | 3837 | } |
73b64342 | 3838 | |
1d15ecd3 | 3839 | |
7e6e6b37 | 3840 | case (ISYMNUM (SCM_IM_SLOT_REF)): |
ca4be6ea | 3841 | x = SCM_CDR (x); |
1d15ecd3 DH |
3842 | { |
3843 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3844 | unsigned long int slot = SCM_I_INUM (SCM_CDR (x)); |
1d15ecd3 DH |
3845 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); |
3846 | } | |
3847 | ||
3848 | ||
7e6e6b37 | 3849 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): |
ca4be6ea | 3850 | x = SCM_CDR (x); |
1d15ecd3 DH |
3851 | { |
3852 | SCM instance = EVALCAR (x, env); | |
e11e83f3 | 3853 | unsigned long int slot = SCM_I_INUM (SCM_CADR (x)); |
1d15ecd3 DH |
3854 | SCM value = EVALCAR (SCM_CDDR (x), env); |
3855 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3856 | RETURN (SCM_UNSPECIFIED); | |
3857 | } | |
3858 | ||
c96d76b8 | 3859 | |
22721140 | 3860 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3861 | |
7e6e6b37 | 3862 | case (ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3863 | { |
3864 | SCM test_form = SCM_CDR (x); | |
3865 | x = SCM_CDR (test_form); | |
3866 | while (!SCM_NULL_OR_NIL_P (x)) | |
3867 | { | |
3868 | SCM test_result = EVALCAR (test_form, env); | |
7888309b | 3869 | if (!(scm_is_false (test_result) |
1d15ecd3 DH |
3870 | || SCM_NULL_OR_NIL_P (test_result))) |
3871 | { | |
bc36d050 | 3872 | if (scm_is_eq (SCM_CAR (x), SCM_UNSPECIFIED)) |
1d15ecd3 DH |
3873 | RETURN (test_result); |
3874 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3875 | goto carloop; | |
3876 | } | |
3877 | else | |
3878 | { | |
3879 | test_form = SCM_CDR (x); | |
3880 | x = SCM_CDR (test_form); | |
3881 | } | |
3882 | } | |
3883 | x = test_form; | |
3884 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3885 | goto carloop; | |
3886 | } | |
73b64342 | 3887 | |
c96d76b8 | 3888 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 | 3889 | |
7e6e6b37 | 3890 | case (ISYMNUM (SCM_IM_BIND)): |
2e171178 MV |
3891 | { |
3892 | SCM vars, exps, vals; | |
73b64342 | 3893 | |
2e171178 MV |
3894 | x = SCM_CDR (x); |
3895 | vars = SCM_CAAR (x); | |
3896 | exps = SCM_CDAR (x); | |
2e171178 | 3897 | vals = SCM_EOL; |
a61f4e0c | 3898 | while (!scm_is_null (exps)) |
2e171178 MV |
3899 | { |
3900 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3901 | exps = SCM_CDR (exps); | |
3902 | } | |
3903 | ||
3904 | scm_swap_bindings (vars, vals); | |
3905 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3906 | |
3907 | /* Ignore all but the last evaluation result. */ | |
a61f4e0c | 3908 | for (x = SCM_CDR (x); !scm_is_null (SCM_CDR (x)); x = SCM_CDR (x)) |
2e171178 | 3909 | { |
a61f4e0c | 3910 | if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 3911 | CEVAL (SCM_CAR (x), env); |
2e171178 MV |
3912 | } |
3913 | proc = EVALCAR (x, env); | |
73b64342 | 3914 | |
2e171178 MV |
3915 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3916 | scm_swap_bindings (vars, vals); | |
73b64342 | 3917 | |
ddea3325 | 3918 | RETURN (proc); |
2e171178 | 3919 | } |
c96d76b8 | 3920 | |
1d15ecd3 | 3921 | |
7e6e6b37 | 3922 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 3923 | { |
9a069bdd DH |
3924 | SCM producer; |
3925 | ||
3926 | x = SCM_CDR (x); | |
3927 | producer = EVALCAR (x, env); | |
3928 | x = SCM_CDR (x); | |
3929 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3930 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3931 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3932 | { |
3933 | /* The list of arguments is not copied. Rather, it is assumed | |
3934 | * that this has been done by the 'values' procedure. */ | |
3935 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3936 | } | |
a513ead3 | 3937 | else |
82b3e2c6 DH |
3938 | { |
3939 | arg1 = scm_list_1 (arg1); | |
3940 | } | |
9a069bdd DH |
3941 | PREP_APPLY (proc, arg1); |
3942 | goto apply_proc; | |
a513ead3 MV |
3943 | } |
3944 | ||
b7798e10 | 3945 | |
0f2d19dd | 3946 | default: |
dec40cd2 | 3947 | break; |
0f2d19dd | 3948 | } |
dec40cd2 DH |
3949 | } |
3950 | else | |
3951 | { | |
434f2f7a DH |
3952 | if (SCM_VARIABLEP (SCM_CAR (x))) |
3953 | proc = SCM_VARIABLE_REF (SCM_CAR (x)); | |
f9986767 DH |
3954 | else if (SCM_ILOCP (SCM_CAR (x))) |
3955 | proc = *scm_ilookup (SCM_CAR (x), env); | |
a61f4e0c | 3956 | else if (scm_is_pair (SCM_CAR (x))) |
434f2f7a | 3957 | proc = CEVAL (SCM_CAR (x), env); |
cc95e00a | 3958 | else if (scm_is_symbol (SCM_CAR (x))) |
0f2d19dd | 3959 | { |
e050d4f8 | 3960 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3961 | { |
3962 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3963 | if (location == NULL) | |
3964 | { | |
3965 | /* we have lost the race, start again. */ | |
3966 | goto dispatch; | |
3967 | } | |
3968 | proc = *location; | |
3969 | } | |
f8769b1d | 3970 | |
22a52da1 | 3971 | if (SCM_MACROP (proc)) |
0f2d19dd | 3972 | { |
86d31dfe MV |
3973 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3974 | lookupcar */ | |
e050d4f8 | 3975 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3976 | #ifdef DEVAL |
7c354052 MD |
3977 | /* Set a flag during macro expansion so that macro |
3978 | application frames can be deleted from the backtrace. */ | |
3979 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3980 | #endif |
dff98306 | 3981 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 3982 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
3983 | #ifdef DEVAL |
3984 | SCM_CLEAR_MACROEXP (debug); | |
3985 | #endif | |
22a52da1 | 3986 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3987 | { |
3b88ed2a | 3988 | case 3: |
0f2d19dd | 3989 | case 2: |
a61f4e0c | 3990 | if (!scm_is_pair (arg1)) |
dff98306 | 3991 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); |
e7313a9d | 3992 | |
bc36d050 MV |
3993 | assert (!scm_is_eq (x, SCM_CAR (arg1)) |
3994 | && !scm_is_eq (x, SCM_CDR (arg1))); | |
e7313a9d | 3995 | |
6dbd0af5 | 3996 | #ifdef DEVAL |
22a52da1 | 3997 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3998 | { |
6dbd0af5 | 3999 | SCM_DEFER_INTS; |
dff98306 DH |
4000 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4001 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
4002 | SCM_ALLOW_INTS; |
4003 | goto dispatch; | |
4004 | } | |
4005 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
4006 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
4007 | SCM_CAR (x), | |
4008 | SCM_CDR (x)); | |
6dbd0af5 | 4009 | #endif |
0f2d19dd | 4010 | SCM_DEFER_INTS; |
dff98306 DH |
4011 | SCM_SETCAR (x, SCM_CAR (arg1)); |
4012 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 4013 | SCM_ALLOW_INTS; |
680516ba DH |
4014 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
4015 | goto loop; | |
3063e30a | 4016 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 4017 | case 1: |
680516ba DH |
4018 | x = arg1; |
4019 | if (SCM_NIMP (x)) | |
4020 | { | |
4021 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
4022 | goto loop; | |
4023 | } | |
4024 | else | |
4025 | RETURN (arg1); | |
3063e30a | 4026 | #endif |
0f2d19dd | 4027 | case 0: |
dff98306 | 4028 | RETURN (arg1); |
0f2d19dd JB |
4029 | } |
4030 | } | |
4031 | } | |
4032 | else | |
434f2f7a | 4033 | proc = SCM_CAR (x); |
bd987b8e | 4034 | |
ddd8f927 | 4035 | if (SCM_MACROP (proc)) |
0f2d19dd | 4036 | goto handle_a_macro; |
0f2d19dd JB |
4037 | } |
4038 | ||
4039 | ||
dec40cd2 DH |
4040 | /* When reaching this part of the code, the following is granted: Variable x |
4041 | * holds the first pair of an expression of the form (<function> arg ...). | |
4042 | * Variable proc holds the object that resulted from the evaluation of | |
4043 | * <function>. In the following, the arguments (if any) will be evaluated, | |
4044 | * and proc will be applied to them. If proc does not really hold a | |
4045 | * function object, this will be signalled as an error on the scheme | |
4046 | * level. If the number of arguments does not match the number of arguments | |
4047 | * that are allowed to be passed to proc, also an error on the scheme level | |
4048 | * will be signalled. */ | |
6dbd0af5 | 4049 | PREP_APPLY (proc, SCM_EOL); |
a61f4e0c | 4050 | if (scm_is_null (SCM_CDR (x))) { |
6dbd0af5 | 4051 | ENTER_APPLY; |
89efbff4 | 4052 | evap0: |
ddd8f927 | 4053 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
4054 | switch (SCM_TYP7 (proc)) |
4055 | { /* no arguments given */ | |
4056 | case scm_tc7_subr_0: | |
4057 | RETURN (SCM_SUBRF (proc) ()); | |
4058 | case scm_tc7_subr_1o: | |
4059 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
4060 | case scm_tc7_lsubr: | |
4061 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
4062 | case scm_tc7_rpsubr: | |
4063 | RETURN (SCM_BOOL_T); | |
4064 | case scm_tc7_asubr: | |
4065 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 4066 | case scm_tc7_smob: |
68b06924 | 4067 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4068 | goto badfun; |
68b06924 | 4069 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 4070 | case scm_tc7_cclo: |
dff98306 | 4071 | arg1 = proc; |
0f2d19dd | 4072 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
4073 | #ifdef DEVAL |
4074 | debug.info->a.proc = proc; | |
dff98306 | 4075 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4076 | #endif |
0f2d19dd | 4077 | goto evap1; |
89efbff4 MD |
4078 | case scm_tc7_pws: |
4079 | proc = SCM_PROCEDURE (proc); | |
4080 | #ifdef DEVAL | |
4081 | debug.info->a.proc = proc; | |
4082 | #endif | |
002f1a5d MD |
4083 | if (!SCM_CLOSUREP (proc)) |
4084 | goto evap0; | |
ddd8f927 | 4085 | /* fallthrough */ |
0f2d19dd | 4086 | case scm_tcs_closures: |
ddd8f927 DH |
4087 | { |
4088 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 4089 | if (scm_is_pair (formals)) |
212e58ed | 4090 | goto wrongnumargs; |
ddd8f927 DH |
4091 | x = SCM_CLOSURE_BODY (proc); |
4092 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
4093 | goto nontoplevel_begin; | |
4094 | } | |
904a077d | 4095 | case scm_tcs_struct: |
195847fa MD |
4096 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4097 | { | |
4098 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 4099 | arg1 = SCM_EOL; |
195847fa MD |
4100 | goto type_dispatch; |
4101 | } | |
2ca0d207 | 4102 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4103 | { |
dff98306 | 4104 | arg1 = proc; |
195847fa MD |
4105 | proc = (SCM_I_ENTITYP (proc) |
4106 | ? SCM_ENTITY_PROCEDURE (proc) | |
4107 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 4108 | #ifdef DEVAL |
195847fa | 4109 | debug.info->a.proc = proc; |
dff98306 | 4110 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 4111 | #endif |
ddd8f927 | 4112 | goto evap1; |
da7f71d7 | 4113 | } |
2ca0d207 DH |
4114 | else |
4115 | goto badfun; | |
0f2d19dd JB |
4116 | case scm_tc7_subr_1: |
4117 | case scm_tc7_subr_2: | |
4118 | case scm_tc7_subr_2o: | |
14b18ed6 | 4119 | case scm_tc7_dsubr: |
0f2d19dd JB |
4120 | case scm_tc7_cxr: |
4121 | case scm_tc7_subr_3: | |
4122 | case scm_tc7_lsubr_2: | |
212e58ed | 4123 | wrongnumargs: |
f5bf2977 | 4124 | scm_wrong_num_args (proc); |
0f2d19dd | 4125 | default: |
ddd8f927 DH |
4126 | badfun: |
4127 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 4128 | } |
6dbd0af5 | 4129 | } |
0f2d19dd JB |
4130 | |
4131 | /* must handle macros by here */ | |
4132 | x = SCM_CDR (x); | |
a61f4e0c | 4133 | if (scm_is_pair (x)) |
dff98306 | 4134 | arg1 = EVALCAR (x, env); |
680ed4a8 | 4135 | else |
ab1f1094 | 4136 | scm_wrong_num_args (proc); |
6dbd0af5 | 4137 | #ifdef DEVAL |
dff98306 | 4138 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 4139 | #endif |
0f2d19dd | 4140 | x = SCM_CDR (x); |
42030fb2 DH |
4141 | { |
4142 | SCM arg2; | |
a61f4e0c | 4143 | if (scm_is_null (x)) |
42030fb2 DH |
4144 | { |
4145 | ENTER_APPLY; | |
4146 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 4147 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4148 | switch (SCM_TYP7 (proc)) |
4149 | { /* have one argument in arg1 */ | |
4150 | case scm_tc7_subr_2o: | |
4151 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4152 | case scm_tc7_subr_1: | |
4153 | case scm_tc7_subr_1o: | |
4154 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4155 | case scm_tc7_dsubr: |
e11e83f3 | 4156 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4157 | { |
d9a67fc4 | 4158 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4159 | } |
4160 | else if (SCM_REALP (arg1)) | |
4161 | { | |
d9a67fc4 | 4162 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4163 | } |
4164 | else if (SCM_BIGP (arg1)) | |
4165 | { | |
d9a67fc4 | 4166 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
14b18ed6 | 4167 | } |
f92e85f7 MV |
4168 | else if (SCM_FRACTIONP (arg1)) |
4169 | { | |
d9a67fc4 | 4170 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 MV |
4171 | } |
4172 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
cc95e00a MV |
4173 | SCM_ARG1, |
4174 | scm_i_symbol_chars (SCM_SNAME (proc))); | |
42030fb2 | 4175 | case scm_tc7_cxr: |
a61f4e0c | 4176 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
42030fb2 DH |
4177 | case scm_tc7_rpsubr: |
4178 | RETURN (SCM_BOOL_T); | |
4179 | case scm_tc7_asubr: | |
4180 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
4181 | case scm_tc7_lsubr: | |
0f2d19dd | 4182 | #ifdef DEVAL |
42030fb2 | 4183 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 4184 | #else |
42030fb2 | 4185 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 4186 | #endif |
42030fb2 DH |
4187 | case scm_tc7_smob: |
4188 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4189 | goto badfun; | |
4190 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
4191 | case scm_tc7_cclo: | |
4192 | arg2 = arg1; | |
4193 | arg1 = proc; | |
4194 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4195 | #ifdef DEVAL |
42030fb2 DH |
4196 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4197 | debug.info->a.proc = proc; | |
6dbd0af5 | 4198 | #endif |
42030fb2 DH |
4199 | goto evap2; |
4200 | case scm_tc7_pws: | |
4201 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 4202 | #ifdef DEVAL |
42030fb2 | 4203 | debug.info->a.proc = proc; |
89efbff4 | 4204 | #endif |
42030fb2 DH |
4205 | if (!SCM_CLOSUREP (proc)) |
4206 | goto evap1; | |
ddd8f927 | 4207 | /* fallthrough */ |
42030fb2 | 4208 | case scm_tcs_closures: |
ddd8f927 DH |
4209 | { |
4210 | /* clos1: */ | |
4211 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4212 | if (scm_is_null (formals) |
4213 | || (scm_is_pair (formals) && scm_is_pair (SCM_CDR (formals)))) | |
212e58ed | 4214 | goto wrongnumargs; |
ddd8f927 | 4215 | x = SCM_CLOSURE_BODY (proc); |
0f2d19dd | 4216 | #ifdef DEVAL |
ddd8f927 DH |
4217 | env = SCM_EXTEND_ENV (formals, |
4218 | debug.info->a.args, | |
4219 | SCM_ENV (proc)); | |
0f2d19dd | 4220 | #else |
ddd8f927 DH |
4221 | env = SCM_EXTEND_ENV (formals, |
4222 | scm_list_1 (arg1), | |
4223 | SCM_ENV (proc)); | |
0f2d19dd | 4224 | #endif |
ddd8f927 DH |
4225 | goto nontoplevel_begin; |
4226 | } | |
42030fb2 DH |
4227 | case scm_tcs_struct: |
4228 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4229 | { | |
4230 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 4231 | #ifdef DEVAL |
42030fb2 | 4232 | arg1 = debug.info->a.args; |
f3d2630a | 4233 | #else |
42030fb2 | 4234 | arg1 = scm_list_1 (arg1); |
f3d2630a | 4235 | #endif |
42030fb2 DH |
4236 | goto type_dispatch; |
4237 | } | |
2ca0d207 | 4238 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4239 | { |
4240 | arg2 = arg1; | |
4241 | arg1 = proc; | |
4242 | proc = (SCM_I_ENTITYP (proc) | |
4243 | ? SCM_ENTITY_PROCEDURE (proc) | |
4244 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 4245 | #ifdef DEVAL |
42030fb2 DH |
4246 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4247 | debug.info->a.proc = proc; | |
0c32d76c | 4248 | #endif |
ddd8f927 | 4249 | goto evap2; |
42030fb2 | 4250 | } |
2ca0d207 DH |
4251 | else |
4252 | goto badfun; | |
42030fb2 DH |
4253 | case scm_tc7_subr_2: |
4254 | case scm_tc7_subr_0: | |
4255 | case scm_tc7_subr_3: | |
4256 | case scm_tc7_lsubr_2: | |
ab1f1094 | 4257 | scm_wrong_num_args (proc); |
42030fb2 DH |
4258 | default: |
4259 | goto badfun; | |
4260 | } | |
4261 | } | |
a61f4e0c | 4262 | if (scm_is_pair (x)) |
42030fb2 DH |
4263 | arg2 = EVALCAR (x, env); |
4264 | else | |
ab1f1094 | 4265 | scm_wrong_num_args (proc); |
bd987b8e | 4266 | |
42030fb2 | 4267 | { /* have two or more arguments */ |
6dbd0af5 | 4268 | #ifdef DEVAL |
42030fb2 | 4269 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 4270 | #endif |
42030fb2 | 4271 | x = SCM_CDR (x); |
a61f4e0c | 4272 | if (scm_is_null (x)) { |
42030fb2 DH |
4273 | ENTER_APPLY; |
4274 | evap2: | |
ddd8f927 | 4275 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4276 | switch (SCM_TYP7 (proc)) |
4277 | { /* have two arguments */ | |
4278 | case scm_tc7_subr_2: | |
4279 | case scm_tc7_subr_2o: | |
4280 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4281 | case scm_tc7_lsubr: | |
0f2d19dd | 4282 | #ifdef DEVAL |
42030fb2 | 4283 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 4284 | #else |
42030fb2 DH |
4285 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
4286 | #endif | |
4287 | case scm_tc7_lsubr_2: | |
4288 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
4289 | case scm_tc7_rpsubr: | |
4290 | case scm_tc7_asubr: | |
4291 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4292 | case scm_tc7_smob: | |
4293 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4294 | goto badfun; | |
4295 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
4296 | cclon: | |
4297 | case scm_tc7_cclo: | |
0f2d19dd | 4298 | #ifdef DEVAL |
42030fb2 DH |
4299 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4300 | scm_cons (proc, debug.info->a.args), | |
4301 | SCM_EOL)); | |
0f2d19dd | 4302 | #else |
42030fb2 DH |
4303 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4304 | scm_cons2 (proc, arg1, | |
4305 | scm_cons (arg2, | |
4306 | scm_eval_args (x, | |
4307 | env, | |
4308 | proc))), | |
4309 | SCM_EOL)); | |
4310 | #endif | |
4311 | case scm_tcs_struct: | |
4312 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4313 | { | |
4314 | x = SCM_ENTITY_PROCEDURE (proc); | |
4315 | #ifdef DEVAL | |
4316 | arg1 = debug.info->a.args; | |
4317 | #else | |
4318 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 4319 | #endif |
42030fb2 DH |
4320 | goto type_dispatch; |
4321 | } | |
2ca0d207 | 4322 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4323 | { |
4324 | operatorn: | |
f3d2630a | 4325 | #ifdef DEVAL |
42030fb2 DH |
4326 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4327 | ? SCM_ENTITY_PROCEDURE (proc) | |
4328 | : SCM_OPERATOR_PROCEDURE (proc), | |
4329 | scm_cons (proc, debug.info->a.args), | |
4330 | SCM_EOL)); | |
f3d2630a | 4331 | #else |
42030fb2 DH |
4332 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4333 | ? SCM_ENTITY_PROCEDURE (proc) | |
4334 | : SCM_OPERATOR_PROCEDURE (proc), | |
4335 | scm_cons2 (proc, arg1, | |
4336 | scm_cons (arg2, | |
4337 | scm_eval_args (x, | |
4338 | env, | |
4339 | proc))), | |
4340 | SCM_EOL)); | |
f3d2630a | 4341 | #endif |
42030fb2 | 4342 | } |
2ca0d207 DH |
4343 | else |
4344 | goto badfun; | |
42030fb2 | 4345 | case scm_tc7_subr_0: |
14b18ed6 | 4346 | case scm_tc7_dsubr: |
42030fb2 DH |
4347 | case scm_tc7_cxr: |
4348 | case scm_tc7_subr_1o: | |
4349 | case scm_tc7_subr_1: | |
4350 | case scm_tc7_subr_3: | |
ab1f1094 | 4351 | scm_wrong_num_args (proc); |
42030fb2 | 4352 | default: |
9b07e212 | 4353 | goto badfun; |
42030fb2 DH |
4354 | case scm_tc7_pws: |
4355 | proc = SCM_PROCEDURE (proc); | |
4356 | #ifdef DEVAL | |
4357 | debug.info->a.proc = proc; | |
4358 | #endif | |
4359 | if (!SCM_CLOSUREP (proc)) | |
4360 | goto evap2; | |
ddd8f927 | 4361 | /* fallthrough */ |
42030fb2 | 4362 | case scm_tcs_closures: |
ddd8f927 DH |
4363 | { |
4364 | /* clos2: */ | |
4365 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4366 | if (scm_is_null (formals) |
4367 | || (scm_is_pair (formals) | |
4368 | && (scm_is_null (SCM_CDR (formals)) | |
4369 | || (scm_is_pair (SCM_CDR (formals)) | |
4370 | && scm_is_pair (SCM_CDDR (formals)))))) | |
212e58ed | 4371 | goto wrongnumargs; |
0c32d76c | 4372 | #ifdef DEVAL |
ddd8f927 DH |
4373 | env = SCM_EXTEND_ENV (formals, |
4374 | debug.info->a.args, | |
4375 | SCM_ENV (proc)); | |
195847fa | 4376 | #else |
ddd8f927 DH |
4377 | env = SCM_EXTEND_ENV (formals, |
4378 | scm_list_2 (arg1, arg2), | |
4379 | SCM_ENV (proc)); | |
195847fa | 4380 | #endif |
ddd8f927 DH |
4381 | x = SCM_CLOSURE_BODY (proc); |
4382 | goto nontoplevel_begin; | |
4383 | } | |
42030fb2 DH |
4384 | } |
4385 | } | |
a61f4e0c | 4386 | if (!scm_is_pair (x)) |
ab1f1094 | 4387 | scm_wrong_num_args (proc); |
42030fb2 DH |
4388 | #ifdef DEVAL |
4389 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4390 | deval_args (x, env, proc, | |
4391 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4392 | #endif | |
4393 | ENTER_APPLY; | |
4394 | evap3: | |
ddd8f927 | 4395 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4396 | switch (SCM_TYP7 (proc)) |
4397 | { /* have 3 or more arguments */ | |
4398 | #ifdef DEVAL | |
6dbd0af5 | 4399 | case scm_tc7_subr_3: |
a61f4e0c | 4400 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4401 | scm_wrong_num_args (proc); |
4402 | else | |
4403 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4404 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4405 | case scm_tc7_asubr: |
4406 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4407 | arg2 = SCM_CDDR (debug.info->a.args); | |
4408 | do | |
4409 | { | |
4410 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4411 | arg2 = SCM_CDR (arg2); | |
4412 | } | |
4413 | while (SCM_NIMP (arg2)); | |
4414 | RETURN (arg1); | |
4415 | case scm_tc7_rpsubr: | |
7888309b | 4416 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4417 | RETURN (SCM_BOOL_F); |
4418 | arg1 = SCM_CDDR (debug.info->a.args); | |
4419 | do | |
4420 | { | |
7888309b | 4421 | if (scm_is_false (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) |
42030fb2 DH |
4422 | RETURN (SCM_BOOL_F); |
4423 | arg2 = SCM_CAR (arg1); | |
4424 | arg1 = SCM_CDR (arg1); | |
4425 | } | |
4426 | while (SCM_NIMP (arg1)); | |
4427 | RETURN (SCM_BOOL_T); | |
4428 | case scm_tc7_lsubr_2: | |
4429 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4430 | SCM_CDDR (debug.info->a.args))); | |
4431 | case scm_tc7_lsubr: | |
4432 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4433 | case scm_tc7_smob: | |
4434 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4435 | goto badfun; | |
4436 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4437 | SCM_CDDR (debug.info->a.args))); | |
4438 | case scm_tc7_cclo: | |
4439 | goto cclon; | |
002f1a5d MD |
4440 | case scm_tc7_pws: |
4441 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4442 | debug.info->a.proc = proc; |
002f1a5d | 4443 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4444 | goto evap3; |
ddd8f927 | 4445 | /* fallthrough */ |
6dbd0af5 | 4446 | case scm_tcs_closures: |
ddd8f927 DH |
4447 | { |
4448 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
4449 | if (scm_is_null (formals) |
4450 | || (scm_is_pair (formals) | |
4451 | && (scm_is_null (SCM_CDR (formals)) | |
4452 | || (scm_is_pair (SCM_CDR (formals)) | |
ddd8f927 | 4453 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4454 | goto wrongnumargs; |
ddd8f927 DH |
4455 | SCM_SET_ARGSREADY (debug); |
4456 | env = SCM_EXTEND_ENV (formals, | |
4457 | debug.info->a.args, | |
4458 | SCM_ENV (proc)); | |
4459 | x = SCM_CLOSURE_BODY (proc); | |
4460 | goto nontoplevel_begin; | |
4461 | } | |
6dbd0af5 | 4462 | #else /* DEVAL */ |
42030fb2 | 4463 | case scm_tc7_subr_3: |
a61f4e0c | 4464 | if (!scm_is_null (SCM_CDR (x))) |
ab1f1094 DH |
4465 | scm_wrong_num_args (proc); |
4466 | else | |
4467 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4468 | case scm_tc7_asubr: |
4469 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4470 | do | |
4471 | { | |
4472 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4473 | x = SCM_CDR(x); | |
4474 | } | |
a61f4e0c | 4475 | while (!scm_is_null (x)); |
42030fb2 DH |
4476 | RETURN (arg1); |
4477 | case scm_tc7_rpsubr: | |
7888309b | 4478 | if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2))) |
42030fb2 DH |
4479 | RETURN (SCM_BOOL_F); |
4480 | do | |
4481 | { | |
4482 | arg1 = EVALCAR (x, env); | |
7888309b | 4483 | if (scm_is_false (SCM_SUBRF (proc) (arg2, arg1))) |
42030fb2 DH |
4484 | RETURN (SCM_BOOL_F); |
4485 | arg2 = arg1; | |
4486 | x = SCM_CDR (x); | |
4487 | } | |
a61f4e0c | 4488 | while (!scm_is_null (x)); |
42030fb2 DH |
4489 | RETURN (SCM_BOOL_T); |
4490 | case scm_tc7_lsubr_2: | |
4491 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4492 | case scm_tc7_lsubr: | |
4493 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4494 | arg2, | |
4495 | scm_eval_args (x, env, proc)))); | |
4496 | case scm_tc7_smob: | |
4497 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4498 | goto badfun; | |
4499 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4500 | scm_eval_args (x, env, proc))); | |
4501 | case scm_tc7_cclo: | |
4502 | goto cclon; | |
4503 | case scm_tc7_pws: | |
4504 | proc = SCM_PROCEDURE (proc); | |
4505 | if (!SCM_CLOSUREP (proc)) | |
4506 | goto evap3; | |
ddd8f927 DH |
4507 | /* fallthrough */ |
4508 | case scm_tcs_closures: | |
da7f71d7 | 4509 | { |
ddd8f927 | 4510 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
a61f4e0c MV |
4511 | if (scm_is_null (formals) |
4512 | || (scm_is_pair (formals) | |
4513 | && (scm_is_null (SCM_CDR (formals)) | |
4514 | || (scm_is_pair (SCM_CDR (formals)) | |
42030fb2 | 4515 | && scm_badargsp (SCM_CDDR (formals), x))))) |
212e58ed | 4516 | goto wrongnumargs; |
ddd8f927 DH |
4517 | env = SCM_EXTEND_ENV (formals, |
4518 | scm_cons2 (arg1, | |
4519 | arg2, | |
4520 | scm_eval_args (x, env, proc)), | |
4521 | SCM_ENV (proc)); | |
4522 | x = SCM_CLOSURE_BODY (proc); | |
4523 | goto nontoplevel_begin; | |
da7f71d7 | 4524 | } |
0f2d19dd | 4525 | #endif /* DEVAL */ |
42030fb2 DH |
4526 | case scm_tcs_struct: |
4527 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4528 | { | |
f3d2630a | 4529 | #ifdef DEVAL |
42030fb2 | 4530 | arg1 = debug.info->a.args; |
f3d2630a | 4531 | #else |
42030fb2 | 4532 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4533 | #endif |
42030fb2 DH |
4534 | x = SCM_ENTITY_PROCEDURE (proc); |
4535 | goto type_dispatch; | |
4536 | } | |
2ca0d207 | 4537 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4538 | goto operatorn; |
2ca0d207 DH |
4539 | else |
4540 | goto badfun; | |
42030fb2 DH |
4541 | case scm_tc7_subr_2: |
4542 | case scm_tc7_subr_1o: | |
4543 | case scm_tc7_subr_2o: | |
4544 | case scm_tc7_subr_0: | |
14b18ed6 | 4545 | case scm_tc7_dsubr: |
42030fb2 DH |
4546 | case scm_tc7_cxr: |
4547 | case scm_tc7_subr_1: | |
ab1f1094 | 4548 | scm_wrong_num_args (proc); |
42030fb2 | 4549 | default: |
9b07e212 | 4550 | goto badfun; |
42030fb2 DH |
4551 | } |
4552 | } | |
0f2d19dd JB |
4553 | } |
4554 | #ifdef DEVAL | |
6dbd0af5 | 4555 | exit: |
5132eef0 | 4556 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4557 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4558 | { |
b7ff98dd MD |
4559 | SCM_CLEAR_TRACED_FRAME (debug); |
4560 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4561 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4562 | else |
4563 | { | |
5f144b10 GH |
4564 | int first; |
4565 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4566 | |
5f144b10 | 4567 | if (first) |
dff98306 | 4568 | arg1 = val; |
5f144b10 | 4569 | else |
6dbd0af5 | 4570 | { |
5f144b10 | 4571 | proc = val; |
6dbd0af5 MD |
4572 | goto ret; |
4573 | } | |
4574 | } | |
d95c0b76 | 4575 | SCM_TRAPS_P = 0; |
dff98306 | 4576 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4577 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4578 | } |
4579 | ret: | |
1646d37b | 4580 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4581 | return proc; |
4582 | #endif | |
4583 | } | |
4584 | ||
6dbd0af5 MD |
4585 | |
4586 | /* SECTION: This code is compiled once. | |
4587 | */ | |
4588 | ||
0f2d19dd JB |
4589 | #ifndef DEVAL |
4590 | ||
fdc28395 | 4591 | \f |
d0b07b5d | 4592 | |
fdc28395 KN |
4593 | /* Simple procedure calls |
4594 | */ | |
4595 | ||
4596 | SCM | |
4597 | scm_call_0 (SCM proc) | |
4598 | { | |
4599 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4600 | } | |
4601 | ||
4602 | SCM | |
4603 | scm_call_1 (SCM proc, SCM arg1) | |
4604 | { | |
4605 | return scm_apply (proc, arg1, scm_listofnull); | |
4606 | } | |
4607 | ||
4608 | SCM | |
4609 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4610 | { | |
4611 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4612 | } | |
4613 | ||
4614 | SCM | |
4615 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4616 | { | |
4617 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4618 | } | |
4619 | ||
d95c0b76 NJ |
4620 | SCM |
4621 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4622 | { | |
4623 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4624 | scm_cons (arg4, scm_listofnull))); | |
4625 | } | |
4626 | ||
fdc28395 KN |
4627 | /* Simple procedure applies |
4628 | */ | |
4629 | ||
4630 | SCM | |
4631 | scm_apply_0 (SCM proc, SCM args) | |
4632 | { | |
4633 | return scm_apply (proc, args, SCM_EOL); | |
4634 | } | |
4635 | ||
4636 | SCM | |
4637 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4638 | { | |
4639 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4640 | } | |
4641 | ||
4642 | SCM | |
4643 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4644 | { | |
4645 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4646 | } | |
4647 | ||
4648 | SCM | |
4649 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4650 | { | |
4651 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4652 | SCM_EOL); | |
4653 | } | |
4654 | ||
82a2622a | 4655 | /* This code processes the arguments to apply: |
b145c172 JB |
4656 | |
4657 | (apply PROC ARG1 ... ARGS) | |
4658 | ||
82a2622a JB |
4659 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4660 | ... arguments onto the front of ARGS, and returns the resulting | |
4661 | list. Note that ARGS is a list; thus, the argument to this | |
4662 | function is a list whose last element is a list. | |
4663 | ||
4664 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4665 | result. apply:nconc2last takes care of building the list of |
4666 | arguments, given (ARG1 ... ARGS). | |
4667 | ||
82a2622a JB |
4668 | Rather than do new consing, apply:nconc2last destroys its argument. |
4669 | On that topic, this code came into my care with the following | |
4670 | beautifully cryptic comment on that topic: "This will only screw | |
4671 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4672 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4673 | |
3b3b36dd | 4674 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4675 | (SCM lst), |
4676 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4677 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4678 | "@var{args}, and returns the resulting list. Note that\n" | |
4679 | "@var{args} is a list; thus, the argument to this function is\n" | |
4680 | "a list whose last element is a list.\n" | |
4681 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4682 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4683 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4684 | { |
4685 | SCM *lloc; | |
34d19ef6 | 4686 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4687 | lloc = &lst; |
a61f4e0c | 4688 | while (!scm_is_null (SCM_CDR (*lloc))) /* Perhaps should be |
c96d76b8 NJ |
4689 | SCM_NULL_OR_NIL_P, but not |
4690 | needed in 99.99% of cases, | |
4691 | and it could seriously hurt | |
4692 | performance. - Neil */ | |
a23afe53 | 4693 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4694 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4695 | *lloc = SCM_CAR (*lloc); |
4696 | return lst; | |
4697 | } | |
1bbd0b84 | 4698 | #undef FUNC_NAME |
0f2d19dd JB |
4699 | |
4700 | #endif /* !DEVAL */ | |
4701 | ||
6dbd0af5 MD |
4702 | |
4703 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4704 | * It is compiled twice. | |
4705 | */ | |
4706 | ||
0f2d19dd | 4707 | #if 0 |
0f2d19dd | 4708 | SCM |
6e8d25a6 | 4709 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4710 | {} |
4711 | #endif | |
4712 | ||
4713 | #if 0 | |
0f2d19dd | 4714 | SCM |
6e8d25a6 | 4715 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4716 | {} |
0f2d19dd JB |
4717 | #endif |
4718 | ||
1cc91f1b | 4719 | |
82a2622a JB |
4720 | /* Apply a function to a list of arguments. |
4721 | ||
4722 | This function is exported to the Scheme level as taking two | |
4723 | required arguments and a tail argument, as if it were: | |
4724 | (lambda (proc arg1 . args) ...) | |
4725 | Thus, if you just have a list of arguments to pass to a procedure, | |
4726 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4727 | args, pass the first as ARG1, then cons any remaining fixed args | |
4728 | onto the front of your argument list, and pass that as ARGS. */ | |
4729 | ||
0f2d19dd | 4730 | SCM |
1bbd0b84 | 4731 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4732 | { |
0f2d19dd | 4733 | #ifdef DEVAL |
92c2555f MV |
4734 | scm_t_debug_frame debug; |
4735 | scm_t_debug_info debug_vect_body; | |
1646d37b | 4736 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 4737 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4738 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4739 | debug.vect[0].a.proc = proc; |
4740 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 4741 | scm_last_debug_frame = &debug; |
0f2d19dd | 4742 | #else |
434f2f7a | 4743 | if (scm_debug_mode_p) |
0f2d19dd | 4744 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4745 | #endif |
4746 | ||
4747 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4748 | |
4749 | /* If ARGS is the empty list, then we're calling apply with only two | |
4750 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4751 | the case, futz with things so that ARG1 is the first argument to | |
4752 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4753 | rest. |
4754 | ||
4755 | Setting the debug apply frame args this way is pretty messy. | |
4756 | Perhaps we should store arg1 and args directly in the frame as | |
4757 | received, and let scm_frame_arguments unpack them, because that's | |
4758 | a relatively rare operation. This works for now; if the Guile | |
4759 | developer archives are still around, see Mikael's post of | |
4760 | 11-Apr-97. */ | |
a61f4e0c | 4761 | if (scm_is_null (args)) |
0f2d19dd | 4762 | { |
a61f4e0c | 4763 | if (scm_is_null (arg1)) |
30000774 JB |
4764 | { |
4765 | arg1 = SCM_UNDEFINED; | |
4766 | #ifdef DEVAL | |
4767 | debug.vect[0].a.args = SCM_EOL; | |
4768 | #endif | |
4769 | } | |
0f2d19dd JB |
4770 | else |
4771 | { | |
30000774 JB |
4772 | #ifdef DEVAL |
4773 | debug.vect[0].a.args = arg1; | |
4774 | #endif | |
0f2d19dd JB |
4775 | args = SCM_CDR (arg1); |
4776 | arg1 = SCM_CAR (arg1); | |
4777 | } | |
4778 | } | |
4779 | else | |
4780 | { | |
0f2d19dd | 4781 | args = scm_nconc2last (args); |
30000774 JB |
4782 | #ifdef DEVAL |
4783 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4784 | #endif | |
0f2d19dd | 4785 | } |
0f2d19dd | 4786 | #ifdef DEVAL |
b6d75948 | 4787 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4788 | { |
4789 | SCM tmp; | |
b7ff98dd | 4790 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4791 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4792 | else |
4793 | { | |
5f144b10 GH |
4794 | int first; |
4795 | ||
4796 | tmp = scm_make_continuation (&first); | |
4797 | if (!first) | |
6dbd0af5 MD |
4798 | goto entap; |
4799 | } | |
d95c0b76 NJ |
4800 | SCM_TRAPS_P = 0; |
4801 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4802 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4803 | } |
4804 | entap: | |
4805 | ENTER_APPLY; | |
4806 | #endif | |
6dbd0af5 | 4807 | tail: |
0f2d19dd JB |
4808 | switch (SCM_TYP7 (proc)) |
4809 | { | |
4810 | case scm_tc7_subr_2o: | |
a61f4e0c | 4811 | args = scm_is_null (args) ? SCM_UNDEFINED : SCM_CAR (args); |
ddea3325 | 4812 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4813 | case scm_tc7_subr_2: |
a61f4e0c | 4814 | if (scm_is_null (args) || !scm_is_null (SCM_CDR (args))) |
ab1f1094 | 4815 | scm_wrong_num_args (proc); |
0f2d19dd | 4816 | args = SCM_CAR (args); |
ddea3325 | 4817 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4818 | case scm_tc7_subr_0: |
ab1f1094 DH |
4819 | if (!SCM_UNBNDP (arg1)) |
4820 | scm_wrong_num_args (proc); | |
4821 | else | |
4822 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4823 | case scm_tc7_subr_1: |
ab1f1094 DH |
4824 | if (SCM_UNBNDP (arg1)) |
4825 | scm_wrong_num_args (proc); | |
0f2d19dd | 4826 | case scm_tc7_subr_1o: |
a61f4e0c | 4827 | if (!scm_is_null (args)) |
ab1f1094 DH |
4828 | scm_wrong_num_args (proc); |
4829 | else | |
4830 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 | 4831 | case scm_tc7_dsubr: |
a61f4e0c | 4832 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
14b18ed6 | 4833 | scm_wrong_num_args (proc); |
e11e83f3 | 4834 | if (SCM_I_INUMP (arg1)) |
14b18ed6 | 4835 | { |
d9a67fc4 | 4836 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
14b18ed6 DH |
4837 | } |
4838 | else if (SCM_REALP (arg1)) | |
4839 | { | |
d9a67fc4 | 4840 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
14b18ed6 DH |
4841 | } |
4842 | else if (SCM_BIGP (arg1)) | |
f92e85f7 | 4843 | { |
d9a67fc4 | 4844 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
4845 | } |
4846 | else if (SCM_FRACTIONP (arg1)) | |
4847 | { | |
d9a67fc4 | 4848 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 4849 | } |
14b18ed6 | 4850 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 4851 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
0f2d19dd | 4852 | case scm_tc7_cxr: |
a61f4e0c | 4853 | if (SCM_UNBNDP (arg1) || !scm_is_null (args)) |
ab1f1094 | 4854 | scm_wrong_num_args (proc); |
a61f4e0c | 4855 | RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc))); |
0f2d19dd | 4856 | case scm_tc7_subr_3: |
a61f4e0c MV |
4857 | if (scm_is_null (args) |
4858 | || scm_is_null (SCM_CDR (args)) | |
4859 | || !scm_is_null (SCM_CDDR (args))) | |
ab1f1094 DH |
4860 | scm_wrong_num_args (proc); |
4861 | else | |
4862 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4863 | case scm_tc7_lsubr: |
4864 | #ifdef DEVAL | |
ddea3325 | 4865 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4866 | #else |
ddea3325 | 4867 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4868 | #endif |
4869 | case scm_tc7_lsubr_2: | |
a61f4e0c | 4870 | if (!scm_is_pair (args)) |
ab1f1094 DH |
4871 | scm_wrong_num_args (proc); |
4872 | else | |
4873 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd | 4874 | case scm_tc7_asubr: |
a61f4e0c | 4875 | if (scm_is_null (args)) |
ddea3325 | 4876 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4877 | while (SCM_NIMP (args)) |
4878 | { | |
a61f4e0c | 4879 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
0f2d19dd JB |
4880 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); |
4881 | args = SCM_CDR (args); | |
4882 | } | |
4883 | RETURN (arg1); | |
4884 | case scm_tc7_rpsubr: | |
a61f4e0c | 4885 | if (scm_is_null (args)) |
0f2d19dd JB |
4886 | RETURN (SCM_BOOL_T); |
4887 | while (SCM_NIMP (args)) | |
4888 | { | |
a61f4e0c | 4889 | SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply"); |
7888309b | 4890 | if (scm_is_false (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) |
0f2d19dd JB |
4891 | RETURN (SCM_BOOL_F); |
4892 | arg1 = SCM_CAR (args); | |
4893 | args = SCM_CDR (args); | |
4894 | } | |
4895 | RETURN (SCM_BOOL_T); | |
4896 | case scm_tcs_closures: | |
4897 | #ifdef DEVAL | |
6dbd0af5 | 4898 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4899 | #else |
4900 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4901 | #endif | |
726d810a | 4902 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4903 | scm_wrong_num_args (proc); |
1609038c MD |
4904 | |
4905 | /* Copy argument list */ | |
4906 | if (SCM_IMP (arg1)) | |
4907 | args = arg1; | |
4908 | else | |
4909 | { | |
4910 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
a61f4e0c | 4911 | for (arg1 = SCM_CDR (arg1); scm_is_pair (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4912 | { |
05b15362 | 4913 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4914 | tl = SCM_CDR (tl); |
4915 | } | |
4916 | SCM_SETCDR (tl, arg1); | |
4917 | } | |
4918 | ||
821f18a4 DH |
4919 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4920 | args, | |
4921 | SCM_ENV (proc)); | |
f9450cdb | 4922 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4923 | again: |
05b15362 | 4924 | arg1 = SCM_CDR (proc); |
a61f4e0c | 4925 | while (!scm_is_null (arg1)) |
2ddb0920 MD |
4926 | { |
4927 | if (SCM_IMP (SCM_CAR (proc))) | |
4928 | { | |
4929 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4930 | { | |
28d52ebb | 4931 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4932 | /* check for race condition */ |
4933 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4934 | m_expand_body (proc, args); |
28d52ebb | 4935 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4936 | goto again; |
2ddb0920 | 4937 | } |
5280aaca | 4938 | else |
17fa3fcf | 4939 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4940 | } |
4941 | else | |
b1cb24ff | 4942 | (void) EVAL (SCM_CAR (proc), args); |
e791c18f | 4943 | proc = arg1; |
05b15362 | 4944 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4945 | } |
e791c18f | 4946 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4947 | case scm_tc7_smob: |
68b06924 | 4948 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4949 | goto badproc; |
afa38f6e | 4950 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4951 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
a61f4e0c | 4952 | else if (scm_is_null (args)) |
ddea3325 | 4953 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
a61f4e0c | 4954 | else if (scm_is_null (SCM_CDR (args))) |
ddea3325 | 4955 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4956 | else |
68b06924 | 4957 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4958 | case scm_tc7_cclo: |
4959 | #ifdef DEVAL | |
6dbd0af5 MD |
4960 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4961 | arg1 = proc; | |
4962 | proc = SCM_CCLO_SUBR (proc); | |
4963 | debug.vect[0].a.proc = proc; | |
4964 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4965 | #else |
4966 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4967 | arg1 = proc; |
4968 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4969 | #endif |
0f2d19dd | 4970 | goto tail; |
89efbff4 MD |
4971 | case scm_tc7_pws: |
4972 | proc = SCM_PROCEDURE (proc); | |
4973 | #ifdef DEVAL | |
4974 | debug.vect[0].a.proc = proc; | |
4975 | #endif | |
4976 | goto tail; | |
904a077d | 4977 | case scm_tcs_struct: |
f3d2630a MD |
4978 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4979 | { | |
4980 | #ifdef DEVAL | |
4981 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4982 | #else | |
4983 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4984 | #endif | |
195847fa | 4985 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4986 | } |
2ca0d207 | 4987 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4988 | { |
504d99c5 | 4989 | /* operator */ |
da7f71d7 MD |
4990 | #ifdef DEVAL |
4991 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4992 | #else | |
4993 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4994 | #endif | |
4995 | arg1 = proc; | |
195847fa MD |
4996 | proc = (SCM_I_ENTITYP (proc) |
4997 | ? SCM_ENTITY_PROCEDURE (proc) | |
4998 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4999 | #ifdef DEVAL |
5000 | debug.vect[0].a.proc = proc; | |
5001 | debug.vect[0].a.args = scm_cons (arg1, args); | |
5002 | #endif | |
195847fa MD |
5003 | if (SCM_NIMP (proc)) |
5004 | goto tail; | |
5005 | else | |
5006 | goto badproc; | |
da7f71d7 | 5007 | } |
2ca0d207 DH |
5008 | else |
5009 | goto badproc; | |
0f2d19dd JB |
5010 | default: |
5011 | badproc: | |
db4b4ca6 | 5012 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
5013 | } |
5014 | #ifdef DEVAL | |
6dbd0af5 | 5015 | exit: |
5132eef0 | 5016 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 5017 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 5018 | { |
b7ff98dd MD |
5019 | SCM_CLEAR_TRACED_FRAME (debug); |
5020 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 5021 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
5022 | else |
5023 | { | |
5f144b10 GH |
5024 | int first; |
5025 | SCM val = scm_make_continuation (&first); | |
5026 | ||
5027 | if (first) | |
5028 | arg1 = val; | |
5029 | else | |
6dbd0af5 | 5030 | { |
5f144b10 | 5031 | proc = val; |
6dbd0af5 MD |
5032 | goto ret; |
5033 | } | |
5034 | } | |
d95c0b76 NJ |
5035 | SCM_TRAPS_P = 0; |
5036 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
5037 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
5038 | } |
5039 | ret: | |
1646d37b | 5040 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
5041 | return proc; |
5042 | #endif | |
5043 | } | |
5044 | ||
6dbd0af5 MD |
5045 | |
5046 | /* SECTION: The rest of this file is only read once. | |
5047 | */ | |
5048 | ||
0f2d19dd JB |
5049 | #ifndef DEVAL |
5050 | ||
504d99c5 MD |
5051 | /* Trampolines |
5052 | * | |
5053 | * Trampolines make it possible to move procedure application dispatch | |
5054 | * outside inner loops. The motivation was clean implementation of | |
5055 | * efficient replacements of R5RS primitives in SRFI-1. | |
5056 | * | |
5057 | * The semantics is clear: scm_trampoline_N returns an optimized | |
5058 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
5059 | * on N args). | |
5060 | * | |
5061 | * Applying the optimization to map and for-each increased efficiency | |
5062 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
5063 | * before. | |
5064 | */ | |
5065 | ||
756414cf MD |
5066 | static SCM |
5067 | call_subr0_0 (SCM proc) | |
5068 | { | |
5069 | return SCM_SUBRF (proc) (); | |
5070 | } | |
5071 | ||
5072 | static SCM | |
5073 | call_subr1o_0 (SCM proc) | |
5074 | { | |
5075 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
5076 | } | |
5077 | ||
5078 | static SCM | |
5079 | call_lsubr_0 (SCM proc) | |
5080 | { | |
5081 | return SCM_SUBRF (proc) (SCM_EOL); | |
5082 | } | |
5083 | ||
5084 | SCM | |
5085 | scm_i_call_closure_0 (SCM proc) | |
5086 | { | |
6a3f13f0 DH |
5087 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5088 | SCM_EOL, | |
5089 | SCM_ENV (proc)); | |
5090 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5091 | return result; |
756414cf MD |
5092 | } |
5093 | ||
5094 | scm_t_trampoline_0 | |
5095 | scm_trampoline_0 (SCM proc) | |
5096 | { | |
2510c810 DH |
5097 | scm_t_trampoline_0 trampoline; |
5098 | ||
756414cf | 5099 | if (SCM_IMP (proc)) |
d0b07b5d | 5100 | return NULL; |
2510c810 | 5101 | |
756414cf MD |
5102 | switch (SCM_TYP7 (proc)) |
5103 | { | |
5104 | case scm_tc7_subr_0: | |
2510c810 DH |
5105 | trampoline = call_subr0_0; |
5106 | break; | |
756414cf | 5107 | case scm_tc7_subr_1o: |
2510c810 DH |
5108 | trampoline = call_subr1o_0; |
5109 | break; | |
756414cf | 5110 | case scm_tc7_lsubr: |
2510c810 DH |
5111 | trampoline = call_lsubr_0; |
5112 | break; | |
756414cf MD |
5113 | case scm_tcs_closures: |
5114 | { | |
5115 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c | 5116 | if (scm_is_null (formals) || !scm_is_pair (formals)) |
2510c810 | 5117 | trampoline = scm_i_call_closure_0; |
756414cf | 5118 | else |
d0b07b5d | 5119 | return NULL; |
2510c810 | 5120 | break; |
756414cf MD |
5121 | } |
5122 | case scm_tcs_struct: | |
5123 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5124 | trampoline = scm_call_generic_0; |
2ca0d207 | 5125 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5126 | trampoline = scm_call_0; |
5127 | else | |
5128 | return NULL; | |
5129 | break; | |
756414cf MD |
5130 | case scm_tc7_smob: |
5131 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5132 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 5133 | else |
d0b07b5d | 5134 | return NULL; |
2510c810 | 5135 | break; |
756414cf MD |
5136 | case scm_tc7_asubr: |
5137 | case scm_tc7_rpsubr: | |
5138 | case scm_tc7_cclo: | |
5139 | case scm_tc7_pws: | |
2510c810 DH |
5140 | trampoline = scm_call_0; |
5141 | break; | |
756414cf | 5142 | default: |
2510c810 | 5143 | return NULL; /* not applicable on zero arguments */ |
756414cf | 5144 | } |
2510c810 DH |
5145 | /* We only reach this point if a valid trampoline was determined. */ |
5146 | ||
5147 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5148 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
434f2f7a | 5149 | if (scm_debug_mode_p) |
2510c810 DH |
5150 | return scm_call_0; |
5151 | else | |
5152 | return trampoline; | |
756414cf MD |
5153 | } |
5154 | ||
504d99c5 MD |
5155 | static SCM |
5156 | call_subr1_1 (SCM proc, SCM arg1) | |
5157 | { | |
5158 | return SCM_SUBRF (proc) (arg1); | |
5159 | } | |
5160 | ||
9ed24633 MD |
5161 | static SCM |
5162 | call_subr2o_1 (SCM proc, SCM arg1) | |
5163 | { | |
5164 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
5165 | } | |
5166 | ||
504d99c5 MD |
5167 | static SCM |
5168 | call_lsubr_1 (SCM proc, SCM arg1) | |
5169 | { | |
5170 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
5171 | } | |
5172 | ||
5173 | static SCM | |
5174 | call_dsubr_1 (SCM proc, SCM arg1) | |
5175 | { | |
e11e83f3 | 5176 | if (SCM_I_INUMP (arg1)) |
504d99c5 | 5177 | { |
d9a67fc4 | 5178 | RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1)))); |
504d99c5 MD |
5179 | } |
5180 | else if (SCM_REALP (arg1)) | |
5181 | { | |
d9a67fc4 | 5182 | RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); |
504d99c5 | 5183 | } |
504d99c5 | 5184 | else if (SCM_BIGP (arg1)) |
f92e85f7 | 5185 | { |
d9a67fc4 | 5186 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); |
f92e85f7 MV |
5187 | } |
5188 | else if (SCM_FRACTIONP (arg1)) | |
5189 | { | |
d9a67fc4 | 5190 | RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); |
f92e85f7 | 5191 | } |
504d99c5 | 5192 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
cc95e00a | 5193 | SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc))); |
504d99c5 MD |
5194 | } |
5195 | ||
5196 | static SCM | |
5197 | call_cxr_1 (SCM proc, SCM arg1) | |
5198 | { | |
a61f4e0c | 5199 | return scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc)); |
504d99c5 MD |
5200 | } |
5201 | ||
5202 | static SCM | |
5203 | call_closure_1 (SCM proc, SCM arg1) | |
5204 | { | |
6a3f13f0 DH |
5205 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5206 | scm_list_1 (arg1), | |
5207 | SCM_ENV (proc)); | |
5208 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5209 | return result; |
504d99c5 MD |
5210 | } |
5211 | ||
5212 | scm_t_trampoline_1 | |
5213 | scm_trampoline_1 (SCM proc) | |
5214 | { | |
2510c810 DH |
5215 | scm_t_trampoline_1 trampoline; |
5216 | ||
504d99c5 | 5217 | if (SCM_IMP (proc)) |
d0b07b5d | 5218 | return NULL; |
2510c810 | 5219 | |
504d99c5 MD |
5220 | switch (SCM_TYP7 (proc)) |
5221 | { | |
5222 | case scm_tc7_subr_1: | |
5223 | case scm_tc7_subr_1o: | |
2510c810 DH |
5224 | trampoline = call_subr1_1; |
5225 | break; | |
9ed24633 | 5226 | case scm_tc7_subr_2o: |
2510c810 DH |
5227 | trampoline = call_subr2o_1; |
5228 | break; | |
504d99c5 | 5229 | case scm_tc7_lsubr: |
2510c810 DH |
5230 | trampoline = call_lsubr_1; |
5231 | break; | |
14b18ed6 | 5232 | case scm_tc7_dsubr: |
2510c810 DH |
5233 | trampoline = call_dsubr_1; |
5234 | break; | |
504d99c5 | 5235 | case scm_tc7_cxr: |
2510c810 DH |
5236 | trampoline = call_cxr_1; |
5237 | break; | |
504d99c5 MD |
5238 | case scm_tcs_closures: |
5239 | { | |
5240 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5241 | if (!scm_is_null (formals) |
5242 | && (!scm_is_pair (formals) || !scm_is_pair (SCM_CDR (formals)))) | |
2510c810 | 5243 | trampoline = call_closure_1; |
504d99c5 | 5244 | else |
d0b07b5d | 5245 | return NULL; |
2510c810 | 5246 | break; |
504d99c5 MD |
5247 | } |
5248 | case scm_tcs_struct: | |
5249 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5250 | trampoline = scm_call_generic_1; |
2ca0d207 | 5251 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5252 | trampoline = scm_call_1; |
5253 | else | |
5254 | return NULL; | |
5255 | break; | |
504d99c5 MD |
5256 | case scm_tc7_smob: |
5257 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5258 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 5259 | else |
d0b07b5d | 5260 | return NULL; |
2510c810 | 5261 | break; |
504d99c5 MD |
5262 | case scm_tc7_asubr: |
5263 | case scm_tc7_rpsubr: | |
5264 | case scm_tc7_cclo: | |
5265 | case scm_tc7_pws: | |
2510c810 DH |
5266 | trampoline = scm_call_1; |
5267 | break; | |
504d99c5 | 5268 | default: |
d0b07b5d | 5269 | return NULL; /* not applicable on one arg */ |
504d99c5 | 5270 | } |
2510c810 DH |
5271 | /* We only reach this point if a valid trampoline was determined. */ |
5272 | ||
5273 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5274 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
434f2f7a | 5275 | if (scm_debug_mode_p) |
2510c810 DH |
5276 | return scm_call_1; |
5277 | else | |
5278 | return trampoline; | |
504d99c5 MD |
5279 | } |
5280 | ||
5281 | static SCM | |
5282 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5283 | { | |
5284 | return SCM_SUBRF (proc) (arg1, arg2); | |
5285 | } | |
5286 | ||
9ed24633 MD |
5287 | static SCM |
5288 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5289 | { | |
5290 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
5291 | } | |
5292 | ||
504d99c5 MD |
5293 | static SCM |
5294 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
5295 | { | |
5296 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
5297 | } | |
5298 | ||
5299 | static SCM | |
5300 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
5301 | { | |
6a3f13f0 DH |
5302 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5303 | scm_list_2 (arg1, arg2), | |
5304 | SCM_ENV (proc)); | |
5305 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5306 | return result; |
504d99c5 MD |
5307 | } |
5308 | ||
5309 | scm_t_trampoline_2 | |
5310 | scm_trampoline_2 (SCM proc) | |
5311 | { | |
2510c810 DH |
5312 | scm_t_trampoline_2 trampoline; |
5313 | ||
504d99c5 | 5314 | if (SCM_IMP (proc)) |
d0b07b5d | 5315 | return NULL; |
2510c810 | 5316 | |
504d99c5 MD |
5317 | switch (SCM_TYP7 (proc)) |
5318 | { | |
5319 | case scm_tc7_subr_2: | |
5320 | case scm_tc7_subr_2o: | |
5321 | case scm_tc7_rpsubr: | |
5322 | case scm_tc7_asubr: | |
2510c810 DH |
5323 | trampoline = call_subr2_2; |
5324 | break; | |
9ed24633 | 5325 | case scm_tc7_lsubr_2: |
2510c810 DH |
5326 | trampoline = call_lsubr2_2; |
5327 | break; | |
504d99c5 | 5328 | case scm_tc7_lsubr: |
2510c810 DH |
5329 | trampoline = call_lsubr_2; |
5330 | break; | |
504d99c5 MD |
5331 | case scm_tcs_closures: |
5332 | { | |
5333 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
a61f4e0c MV |
5334 | if (!scm_is_null (formals) |
5335 | && (!scm_is_pair (formals) | |
5336 | || (!scm_is_null (SCM_CDR (formals)) | |
5337 | && (!scm_is_pair (SCM_CDR (formals)) | |
5338 | || !scm_is_pair (SCM_CDDR (formals)))))) | |
2510c810 | 5339 | trampoline = call_closure_2; |
504d99c5 | 5340 | else |
d0b07b5d | 5341 | return NULL; |
2510c810 | 5342 | break; |
504d99c5 MD |
5343 | } |
5344 | case scm_tcs_struct: | |
5345 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5346 | trampoline = scm_call_generic_2; |
2ca0d207 | 5347 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5348 | trampoline = scm_call_2; |
5349 | else | |
5350 | return NULL; | |
5351 | break; | |
504d99c5 MD |
5352 | case scm_tc7_smob: |
5353 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5354 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5355 | else |
d0b07b5d | 5356 | return NULL; |
2510c810 | 5357 | break; |
504d99c5 MD |
5358 | case scm_tc7_cclo: |
5359 | case scm_tc7_pws: | |
2510c810 DH |
5360 | trampoline = scm_call_2; |
5361 | break; | |
504d99c5 | 5362 | default: |
d0b07b5d | 5363 | return NULL; /* not applicable on two args */ |
504d99c5 | 5364 | } |
2510c810 DH |
5365 | /* We only reach this point if a valid trampoline was determined. */ |
5366 | ||
5367 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5368 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
434f2f7a | 5369 | if (scm_debug_mode_p) |
2510c810 DH |
5370 | return scm_call_2; |
5371 | else | |
5372 | return trampoline; | |
504d99c5 MD |
5373 | } |
5374 | ||
d9c393f5 JB |
5375 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5376 | ||
47c3f06d | 5377 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5378 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5379 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5380 | static inline void |
47c3f06d | 5381 | check_map_args (SCM argv, |
c014a02e | 5382 | long len, |
47c3f06d MD |
5383 | SCM gf, |
5384 | SCM proc, | |
5385 | SCM args, | |
5386 | const char *who) | |
d9c393f5 | 5387 | { |
c014a02e | 5388 | long i; |
d9c393f5 | 5389 | |
4057a3e0 | 5390 | for (i = SCM_SIMPLE_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5391 | { |
4057a3e0 MV |
5392 | SCM elt = SCM_SIMPLE_VECTOR_REF (argv, i); |
5393 | long elt_len = scm_ilength (elt); | |
d9c393f5 JB |
5394 | |
5395 | if (elt_len < 0) | |
47c3f06d MD |
5396 | { |
5397 | if (gf) | |
5398 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5399 | else | |
4057a3e0 | 5400 | scm_wrong_type_arg (who, i + 2, elt); |
47c3f06d | 5401 | } |
d9c393f5 JB |
5402 | |
5403 | if (elt_len != len) | |
4057a3e0 | 5404 | scm_out_of_range_pos (who, elt, scm_from_long (i + 2)); |
d9c393f5 | 5405 | } |
d9c393f5 JB |
5406 | } |
5407 | ||
5408 | ||
47c3f06d | 5409 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5410 | |
368bf056 MD |
5411 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5412 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5413 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5414 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5415 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5416 | */ |
5417 | ||
0f2d19dd | 5418 | SCM |
1bbd0b84 | 5419 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5420 | #define FUNC_NAME s_map |
0f2d19dd | 5421 | { |
c014a02e | 5422 | long i, len; |
0f2d19dd JB |
5423 | SCM res = SCM_EOL; |
5424 | SCM *pres = &res; | |
0f2d19dd | 5425 | |
d9c393f5 | 5426 | len = scm_ilength (arg1); |
47c3f06d MD |
5427 | SCM_GASSERTn (len >= 0, |
5428 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5429 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5430 | if (scm_is_null (args)) |
0f2d19dd | 5431 | { |
504d99c5 MD |
5432 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5433 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5434 | while (SCM_NIMP (arg1)) | |
5435 | { | |
5436 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5437 | pres = SCM_CDRLOC (*pres); | |
5438 | arg1 = SCM_CDR (arg1); | |
5439 | } | |
5440 | return res; | |
5441 | } | |
a61f4e0c | 5442 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5443 | { |
5444 | SCM arg2 = SCM_CAR (args); | |
5445 | int len2 = scm_ilength (arg2); | |
5446 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5447 | SCM_GASSERTn (call, | |
5448 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5449 | SCM_GASSERTn (len2 >= 0, | |
5450 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5451 | if (len2 != len) | |
5452 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5453 | while (SCM_NIMP (arg1)) |
5454 | { | |
504d99c5 | 5455 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5456 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5457 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5458 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5459 | } |
5460 | return res; | |
5461 | } | |
05b15362 DH |
5462 | arg1 = scm_cons (arg1, args); |
5463 | args = scm_vector (arg1); | |
47c3f06d | 5464 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5465 | while (1) |
5466 | { | |
5467 | arg1 = SCM_EOL; | |
4057a3e0 | 5468 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5469 | { |
4057a3e0 MV |
5470 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5471 | if (SCM_IMP (elt)) | |
d9c393f5 | 5472 | return res; |
4057a3e0 MV |
5473 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5474 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd | 5475 | } |
8ea46249 | 5476 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5477 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5478 | } |
5479 | } | |
af45e3b0 | 5480 | #undef FUNC_NAME |
0f2d19dd JB |
5481 | |
5482 | ||
47c3f06d | 5483 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5484 | |
0f2d19dd | 5485 | SCM |
1bbd0b84 | 5486 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5487 | #define FUNC_NAME s_for_each |
0f2d19dd | 5488 | { |
c014a02e | 5489 | long i, len; |
d9c393f5 | 5490 | len = scm_ilength (arg1); |
47c3f06d MD |
5491 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5492 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5493 | SCM_VALIDATE_REST_ARGUMENT (args); |
a61f4e0c | 5494 | if (scm_is_null (args)) |
0f2d19dd | 5495 | { |
504d99c5 MD |
5496 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5497 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5498 | while (SCM_NIMP (arg1)) | |
5499 | { | |
5500 | call (proc, SCM_CAR (arg1)); | |
5501 | arg1 = SCM_CDR (arg1); | |
5502 | } | |
5503 | return SCM_UNSPECIFIED; | |
5504 | } | |
a61f4e0c | 5505 | if (scm_is_null (SCM_CDR (args))) |
504d99c5 MD |
5506 | { |
5507 | SCM arg2 = SCM_CAR (args); | |
5508 | int len2 = scm_ilength (arg2); | |
5509 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5510 | SCM_GASSERTn (call, g_for_each, | |
5511 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5512 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5513 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5514 | if (len2 != len) | |
5515 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5516 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5517 | { |
504d99c5 | 5518 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5519 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5520 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5521 | } |
5522 | return SCM_UNSPECIFIED; | |
5523 | } | |
05b15362 DH |
5524 | arg1 = scm_cons (arg1, args); |
5525 | args = scm_vector (arg1); | |
47c3f06d | 5526 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5527 | while (1) |
5528 | { | |
5529 | arg1 = SCM_EOL; | |
4057a3e0 | 5530 | for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5531 | { |
4057a3e0 MV |
5532 | SCM elt = SCM_SIMPLE_VECTOR_REF (args, i); |
5533 | if (SCM_IMP (elt)) | |
c96d76b8 | 5534 | return SCM_UNSPECIFIED; |
4057a3e0 MV |
5535 | arg1 = scm_cons (SCM_CAR (elt), arg1); |
5536 | SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt)); | |
0f2d19dd JB |
5537 | } |
5538 | scm_apply (proc, arg1, SCM_EOL); | |
5539 | } | |
5540 | } | |
af45e3b0 | 5541 | #undef FUNC_NAME |
0f2d19dd | 5542 | |
1cc91f1b | 5543 | |
0f2d19dd | 5544 | SCM |
6e8d25a6 | 5545 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5546 | { |
16d4699b MV |
5547 | SCM z; |
5548 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5549 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5550 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5551 | return z; |
5552 | } | |
5553 | ||
5554 | ||
92c2555f | 5555 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5556 | |
0f2d19dd | 5557 | SCM |
6e8d25a6 | 5558 | scm_makprom (SCM code) |
0f2d19dd | 5559 | { |
28d52ebb MD |
5560 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5561 | SCM_UNPACK (code), | |
5562 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
5563 | } |
5564 | ||
28d52ebb MD |
5565 | static size_t |
5566 | promise_free (SCM promise) | |
5567 | { | |
5568 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
5569 | return 0; | |
5570 | } | |
1cc91f1b | 5571 | |
0f2d19dd | 5572 | static int |
e841c3e0 | 5573 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5574 | { |
19402679 | 5575 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5576 | scm_puts ("#<promise ", port); |
19402679 | 5577 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5578 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5579 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5580 | scm_putc ('>', port); |
0f2d19dd JB |
5581 | return !0; |
5582 | } | |
5583 | ||
3b3b36dd | 5584 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5585 | (SCM promise), |
67e8151b MG |
5586 | "If the promise @var{x} has not been computed yet, compute and\n" |
5587 | "return @var{x}, otherwise just return the previously computed\n" | |
5588 | "value.") | |
1bbd0b84 | 5589 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5590 | { |
28d52ebb MD |
5591 | SCM_VALIDATE_SMOB (1, promise, promise); |
5592 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
5593 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5594 | { |
28d52ebb MD |
5595 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5596 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5597 | { |
28d52ebb MD |
5598 | SCM_SET_PROMISE_DATA (promise, ans); |
5599 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5600 | } |
5601 | } | |
28d52ebb MD |
5602 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
5603 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 5604 | } |
1bbd0b84 | 5605 | #undef FUNC_NAME |
0f2d19dd | 5606 | |
445f675c | 5607 | |
a1ec6916 | 5608 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5609 | (SCM obj), |
b380b885 | 5610 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5611 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5612 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5613 | { |
7888309b | 5614 | return scm_from_bool (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5615 | } |
1bbd0b84 | 5616 | #undef FUNC_NAME |
0f2d19dd | 5617 | |
445f675c | 5618 | |
a1ec6916 | 5619 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5620 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5621 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5622 | "Any source properties associated with @var{xorig} are also associated\n" | |
5623 | "with the new pair.") | |
1bbd0b84 | 5624 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5625 | { |
5626 | SCM p, z; | |
16d4699b | 5627 | z = scm_cons (x, y); |
26d5b9b4 MD |
5628 | /* Copy source properties possibly associated with xorig. */ |
5629 | p = scm_whash_lookup (scm_source_whash, xorig); | |
7888309b | 5630 | if (scm_is_true (p)) |
26d5b9b4 MD |
5631 | scm_whash_insert (scm_source_whash, z, p); |
5632 | return z; | |
5633 | } | |
1bbd0b84 | 5634 | #undef FUNC_NAME |
26d5b9b4 | 5635 | |
445f675c | 5636 | |
62360b89 DH |
5637 | /* The function scm_copy_tree is used to copy an expression tree to allow the |
5638 | * memoizer to modify the expression during memoization. scm_copy_tree | |
5639 | * creates deep copies of pairs and vectors, but not of any other data types, | |
5640 | * since only pairs and vectors will be parsed by the memoizer. | |
5641 | * | |
5642 | * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise | |
5643 | * pattern is used to detect cycles. In fact, the pattern is used in two | |
5644 | * dimensions, vertical (indicated in the code by the variable names 'hare' | |
5645 | * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both | |
5646 | * dimensions, the hare/rabbit will take two steps when the tortoise/turtle | |
5647 | * takes one. | |
5648 | * | |
5649 | * The vertical dimension corresponds to recursive calls to function | |
5650 | * copy_tree: This happens when descending into vector elements, into cars of | |
5651 | * lists and into the cdr of an improper list. In this dimension, the | |
5652 | * tortoise follows the hare by using the processor stack: Every stack frame | |
5653 | * will hold an instance of struct t_trace. These instances are connected in | |
5654 | * a way that represents the trace of the hare, which thus can be followed by | |
5655 | * the tortoise. The tortoise will always point to struct t_trace instances | |
5656 | * relating to SCM objects that have already been copied. Thus, a cycle is | |
5657 | * detected if the tortoise and the hare point to the same object, | |
5658 | * | |
5659 | * The horizontal dimension is within one execution of copy_tree, when the | |
5660 | * function cdr's along the pairs of a list. This is the standard | |
5661 | * hare-and-tortoise implementation, found several times in guile. */ | |
5662 | ||
5663 | struct t_trace { | |
5664 | struct t_trace *trace; // These pointers form a trace along the stack. | |
5665 | SCM obj; // The object handled at the respective stack frame. | |
5666 | }; | |
5667 | ||
5668 | static SCM | |
5669 | copy_tree ( | |
5670 | struct t_trace *const hare, | |
5671 | struct t_trace *tortoise, | |
5672 | unsigned int tortoise_delay ) | |
5673 | { | |
4057a3e0 | 5674 | if (!scm_is_pair (hare->obj) && !scm_is_simple_vector (hare->obj)) |
62360b89 DH |
5675 | { |
5676 | return hare->obj; | |
5677 | } | |
5678 | else | |
5679 | { | |
5680 | /* Prepare the trace along the stack. */ | |
5681 | struct t_trace new_hare; | |
5682 | hare->trace = &new_hare; | |
5683 | ||
5684 | /* The tortoise will make its step after the delay has elapsed. Note | |
5685 | * that in contrast to the typical hare-and-tortoise pattern, the step | |
5686 | * of the tortoise happens before the hare takes its steps. This is, in | |
5687 | * principle, no problem, except for the start of the algorithm: Then, | |
5fb64383 | 5688 | * it has to be made sure that the hare actually gets its advantage of |
62360b89 DH |
5689 | * two steps. */ |
5690 | if (tortoise_delay == 0) | |
5691 | { | |
5692 | tortoise_delay = 1; | |
5693 | tortoise = tortoise->trace; | |
bc36d050 | 5694 | ASSERT_SYNTAX (!scm_is_eq (hare->obj, tortoise->obj), |
62360b89 DH |
5695 | s_bad_expression, hare->obj); |
5696 | } | |
5697 | else | |
5698 | { | |
5699 | --tortoise_delay; | |
5700 | } | |
5701 | ||
4057a3e0 | 5702 | if (scm_is_simple_vector (hare->obj)) |
62360b89 | 5703 | { |
4057a3e0 MV |
5704 | size_t length = SCM_SIMPLE_VECTOR_LENGTH (hare->obj); |
5705 | SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED); | |
62360b89 DH |
5706 | |
5707 | /* Each vector element is copied by recursing into copy_tree, having | |
5708 | * the tortoise follow the hare into the depths of the stack. */ | |
5709 | unsigned long int i; | |
5710 | for (i = 0; i < length; ++i) | |
5711 | { | |
5712 | SCM new_element; | |
4057a3e0 | 5713 | new_hare.obj = SCM_SIMPLE_VECTOR_REF (hare->obj, i); |
62360b89 | 5714 | new_element = copy_tree (&new_hare, tortoise, tortoise_delay); |
4057a3e0 | 5715 | SCM_SIMPLE_VECTOR_SET (new_vector, i, new_element); |
62360b89 DH |
5716 | } |
5717 | ||
5718 | return new_vector; | |
5719 | } | |
a61f4e0c | 5720 | else // scm_is_pair (hare->obj) |
62360b89 DH |
5721 | { |
5722 | SCM result; | |
5723 | SCM tail; | |
5724 | ||
5725 | SCM rabbit = hare->obj; | |
5726 | SCM turtle = hare->obj; | |
5727 | ||
5728 | SCM copy; | |
5729 | ||
5730 | /* The first pair of the list is treated specially, in order to | |
5731 | * preserve a potential source code position. */ | |
5732 | result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL); | |
5733 | new_hare.obj = SCM_CAR (rabbit); | |
5734 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5735 | SCM_SETCAR (tail, copy); | |
5736 | ||
5737 | /* The remaining pairs of the list are copied by, horizontally, | |
5738 | * having the turtle follow the rabbit, and, vertically, having the | |
5739 | * tortoise follow the hare into the depths of the stack. */ | |
5740 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5741 | while (scm_is_pair (rabbit)) |
62360b89 DH |
5742 | { |
5743 | new_hare.obj = SCM_CAR (rabbit); | |
5744 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5745 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5746 | tail = SCM_CDR (tail); | |
5747 | ||
5748 | rabbit = SCM_CDR (rabbit); | |
a61f4e0c | 5749 | if (scm_is_pair (rabbit)) |
62360b89 DH |
5750 | { |
5751 | new_hare.obj = SCM_CAR (rabbit); | |
5752 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5753 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5754 | tail = SCM_CDR (tail); | |
5755 | rabbit = SCM_CDR (rabbit); | |
5756 | ||
5757 | turtle = SCM_CDR (turtle); | |
bc36d050 | 5758 | ASSERT_SYNTAX (!scm_is_eq (rabbit, turtle), |
62360b89 DH |
5759 | s_bad_expression, rabbit); |
5760 | } | |
5761 | } | |
5762 | ||
5763 | /* We have to recurse into copy_tree again for the last cdr, in | |
5764 | * order to handle the situation that it holds a vector. */ | |
5765 | new_hare.obj = rabbit; | |
5766 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5767 | SCM_SETCDR (tail, copy); | |
5768 | ||
5769 | return result; | |
5770 | } | |
5771 | } | |
5772 | } | |
5773 | ||
a1ec6916 | 5774 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5775 | (SCM obj), |
b380b885 | 5776 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
bfefbf18 | 5777 | "the new data structure. @code{copy-tree} recurses down the\n" |
b380b885 MD |
5778 | "contents of both pairs and vectors (since both cons cells and vector\n" |
5779 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5780 | "any other object.") | |
1bbd0b84 | 5781 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd | 5782 | { |
62360b89 DH |
5783 | /* Prepare the trace along the stack. */ |
5784 | struct t_trace trace; | |
5785 | trace.obj = obj; | |
5786 | ||
5787 | /* In function copy_tree, if the tortoise makes its step, it will do this | |
5788 | * before the hare has the chance to move. Thus, we have to make sure that | |
5789 | * the very first step of the tortoise will not happen after the hare has | |
5790 | * really made two steps. This is achieved by passing '2' as the initial | |
5791 | * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare | |
5792 | * a bigger advantage may improve performance slightly. */ | |
5793 | return copy_tree (&trace, &trace, 2); | |
0f2d19dd | 5794 | } |
1bbd0b84 | 5795 | #undef FUNC_NAME |
0f2d19dd | 5796 | |
1cc91f1b | 5797 | |
4163eb72 MV |
5798 | /* We have three levels of EVAL here: |
5799 | ||
5800 | - scm_i_eval (exp, env) | |
5801 | ||
5802 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5803 | structure as used by the actual tree code evaluator. When ENV is | |
5804 | a top-level environment, then changes to the current module are | |
a513ead3 | 5805 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5806 | the current module. |
5807 | ||
5808 | - scm_primitive_eval (exp) | |
5809 | ||
5810 | evaluates EXP in the top-level environment as determined by the | |
5811 | current module. This is done by constructing a suitable | |
5812 | environment and calling scm_i_eval. Thus, changes to the | |
5813 | top-level module are tracked normally. | |
5814 | ||
5815 | - scm_eval (exp, mod) | |
5816 | ||
a513ead3 | 5817 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
5818 | setting the current module to MOD, invoking scm_primitive_eval on |
5819 | EXP, and then restoring the current module to the value it had | |
5820 | previously. That is, while EXP is evaluated, changes to the | |
5821 | current module are tracked, but these changes do not persist when | |
5822 | scm_eval returns. | |
5823 | ||
5824 | For each level of evals, there are two variants, distinguished by a | |
5825 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5826 | variant can destructively modify EXP into something completely | |
5827 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5828 | _x variants should not ever be used again for anything. So when in | |
5829 | doubt, use the ordinary variant. | |
5830 | ||
5831 | */ | |
5832 | ||
0f2d19dd | 5833 | SCM |
68d8be66 | 5834 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5835 | { |
cc95e00a | 5836 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5837 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5838 | else | |
385609b9 | 5839 | return SCM_I_XEVAL (exp, env); |
0f2d19dd JB |
5840 | } |
5841 | ||
68d8be66 MD |
5842 | SCM |
5843 | scm_i_eval (SCM exp, SCM env) | |
5844 | { | |
26fb6390 | 5845 | exp = scm_copy_tree (exp); |
cc95e00a | 5846 | if (scm_is_symbol (exp)) |
434f2f7a DH |
5847 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); |
5848 | else | |
385609b9 | 5849 | return SCM_I_XEVAL (exp, env); |
68d8be66 MD |
5850 | } |
5851 | ||
5852 | SCM | |
4163eb72 | 5853 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5854 | { |
a513ead3 | 5855 | SCM env; |
bcdab802 | 5856 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5857 | if (SCM_NIMP (transformer)) |
fdc28395 | 5858 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5859 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5860 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5861 | } |
5862 | ||
4163eb72 MV |
5863 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5864 | (SCM exp), | |
2069af38 | 5865 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5866 | "the current module.") |
5867 | #define FUNC_NAME s_scm_primitive_eval | |
5868 | { | |
a513ead3 | 5869 | SCM env; |
bcdab802 | 5870 | SCM transformer = scm_current_module_transformer (); |
7888309b | 5871 | if (scm_is_true (transformer)) |
fdc28395 | 5872 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5873 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5874 | return scm_i_eval (exp, env); |
5875 | } | |
5876 | #undef FUNC_NAME | |
5877 | ||
6bff1368 | 5878 | |
68d8be66 MD |
5879 | /* Eval does not take the second arg optionally. This is intentional |
5880 | * in order to be R5RS compatible, and to prepare for the new module | |
5881 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5882 | * environment explicit. */ |
549e6ec6 | 5883 | |
09074dbf DH |
5884 | static void |
5885 | change_environment (void *data) | |
5886 | { | |
5887 | SCM pair = SCM_PACK (data); | |
5888 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 5889 | SCM old_module = scm_current_module (); |
09074dbf | 5890 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 5891 | scm_set_current_module (new_module); |
09074dbf DH |
5892 | } |
5893 | ||
09074dbf DH |
5894 | static void |
5895 | restore_environment (void *data) | |
5896 | { | |
5897 | SCM pair = SCM_PACK (data); | |
5898 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 5899 | SCM new_module = scm_current_module (); |
2e9c835d | 5900 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 5901 | scm_set_current_module (old_module); |
09074dbf DH |
5902 | } |
5903 | ||
4163eb72 MV |
5904 | static SCM |
5905 | inner_eval_x (void *data) | |
5906 | { | |
5907 | return scm_primitive_eval_x (SCM_PACK(data)); | |
5908 | } | |
5909 | ||
5910 | SCM | |
5911 | scm_eval_x (SCM exp, SCM module) | |
5912 | #define FUNC_NAME "eval!" | |
5913 | { | |
5914 | SCM_VALIDATE_MODULE (2, module); | |
5915 | ||
5916 | return scm_internal_dynamic_wind | |
5917 | (change_environment, inner_eval_x, restore_environment, | |
5918 | (void *) SCM_UNPACK (exp), | |
5919 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
5920 | } | |
5921 | #undef FUNC_NAME | |
5922 | ||
5923 | static SCM | |
5924 | inner_eval (void *data) | |
5925 | { | |
5926 | return scm_primitive_eval (SCM_PACK(data)); | |
5927 | } | |
09074dbf | 5928 | |
68d8be66 | 5929 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
5930 | (SCM exp, SCM module), |
5931 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
5932 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 5933 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
5934 | "@var{module} is made the current module. The current module\n" |
5935 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 5936 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5937 | { |
4163eb72 | 5938 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
5939 | |
5940 | return scm_internal_dynamic_wind | |
5941 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
5942 | (void *) SCM_UNPACK (exp), |
5943 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 5944 | } |
1bbd0b84 | 5945 | #undef FUNC_NAME |
0f2d19dd | 5946 | |
6dbd0af5 | 5947 | |
434f2f7a | 5948 | /* At this point, deval and scm_dapply are generated. |
6dbd0af5 MD |
5949 | */ |
5950 | ||
a44a9715 DH |
5951 | #define DEVAL |
5952 | #include "eval.c" | |
0f2d19dd | 5953 | |
1cc91f1b | 5954 | |
434f2f7a DH |
5955 | #if (SCM_ENABLE_DEPRECATED == 1) |
5956 | ||
5957 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5958 | SCM scm_ceval (SCM x, SCM env) | |
5959 | { | |
a61f4e0c | 5960 | if (scm_is_pair (x)) |
434f2f7a | 5961 | return ceval (x, env); |
cc95e00a | 5962 | else if (scm_is_symbol (x)) |
434f2f7a DH |
5963 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
5964 | else | |
385609b9 | 5965 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
5966 | } |
5967 | ||
5968 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5969 | SCM scm_deval (SCM x, SCM env) | |
5970 | { | |
a61f4e0c | 5971 | if (scm_is_pair (x)) |
434f2f7a | 5972 | return deval (x, env); |
cc95e00a | 5973 | else if (scm_is_symbol (x)) |
434f2f7a DH |
5974 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); |
5975 | else | |
385609b9 | 5976 | return SCM_I_XEVAL (x, env); |
434f2f7a DH |
5977 | } |
5978 | ||
5979 | static SCM | |
5980 | dispatching_eval (SCM x, SCM env) | |
5981 | { | |
5982 | if (scm_debug_mode_p) | |
5983 | return scm_deval (x, env); | |
5984 | else | |
5985 | return scm_ceval (x, env); | |
5986 | } | |
5987 | ||
5988 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5989 | SCM (*scm_ceval_ptr) (SCM x, SCM env) = dispatching_eval; | |
5990 | ||
5991 | #endif | |
5992 | ||
5993 | ||
0f2d19dd JB |
5994 | void |
5995 | scm_init_eval () | |
0f2d19dd | 5996 | { |
33b97402 MD |
5997 | scm_init_opts (scm_evaluator_traps, |
5998 | scm_evaluator_trap_table, | |
5999 | SCM_N_EVALUATOR_TRAPS); | |
6000 | scm_init_opts (scm_eval_options_interface, | |
6001 | scm_eval_opts, | |
6002 | SCM_N_EVAL_OPTIONS); | |
6003 | ||
f99c9c28 MD |
6004 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
6005 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 6006 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 6007 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 6008 | |
a44a9715 DH |
6009 | undefineds = scm_list_1 (SCM_UNDEFINED); |
6010 | SCM_SETCDR (undefineds, undefineds); | |
6011 | scm_permanent_object (undefineds); | |
7c33806a | 6012 | |
a44a9715 | 6013 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 6014 | |
a44a9715 DH |
6015 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
6016 | scm_permanent_object (f_apply); | |
86d31dfe | 6017 | |
a0599745 | 6018 | #include "libguile/eval.x" |
60a49842 | 6019 | |
25eaf21a | 6020 | scm_add_feature ("delay"); |
0f2d19dd | 6021 | } |
0f2d19dd | 6022 | |
6dbd0af5 | 6023 | #endif /* !DEVAL */ |
89e00824 ML |
6024 | |
6025 | /* | |
6026 | Local Variables: | |
6027 | c-file-style: "gnu" | |
6028 | End: | |
6029 | */ |