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 | ||
a0599745 | 55 | #include "libguile/_scm.h" |
21628685 DH |
56 | #include "libguile/alist.h" |
57 | #include "libguile/async.h" | |
58 | #include "libguile/continuations.h" | |
a0599745 | 59 | #include "libguile/debug.h" |
328dc9a3 | 60 | #include "libguile/deprecation.h" |
09074dbf | 61 | #include "libguile/dynwind.h" |
a0599745 | 62 | #include "libguile/eq.h" |
21628685 DH |
63 | #include "libguile/feature.h" |
64 | #include "libguile/fluids.h" | |
756414cf | 65 | #include "libguile/futures.h" |
21628685 DH |
66 | #include "libguile/goops.h" |
67 | #include "libguile/hash.h" | |
68 | #include "libguile/hashtab.h" | |
69 | #include "libguile/lang.h" | |
4610b011 | 70 | #include "libguile/list.h" |
a0599745 | 71 | #include "libguile/macros.h" |
a0599745 | 72 | #include "libguile/modules.h" |
21628685 | 73 | #include "libguile/objects.h" |
a0599745 | 74 | #include "libguile/ports.h" |
7e6e6b37 | 75 | #include "libguile/print.h" |
21628685 | 76 | #include "libguile/procprop.h" |
a0599745 | 77 | #include "libguile/root.h" |
21628685 DH |
78 | #include "libguile/smob.h" |
79 | #include "libguile/srcprop.h" | |
80 | #include "libguile/stackchk.h" | |
81 | #include "libguile/strings.h" | |
82 | #include "libguile/throw.h" | |
83 | #include "libguile/validate.h" | |
a513ead3 | 84 | #include "libguile/values.h" |
21628685 | 85 | #include "libguile/vectors.h" |
a0599745 | 86 | |
a0599745 | 87 | #include "libguile/eval.h" |
89efbff4 | 88 | |
0f2d19dd JB |
89 | \f |
90 | ||
0f572ba7 | 91 | static SCM canonicalize_define (SCM expr); |
e5156567 | 92 | static SCM *scm_lookupcar1 (SCM vloc, SCM genv, int check); |
0f572ba7 | 93 | |
0a9ea92c KR |
94 | /* prototype in eval.h is not given under --disable-deprecated */ |
95 | SCM_API SCM scm_macroexp (SCM x, SCM env); | |
96 | ||
0f572ba7 DH |
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 | |
36245b66 DH |
151 | /* If a macro keyword is detected in a place where macro keywords are not |
152 | * allowed, a 'Misplaced syntactic keyword' error is signalled. */ | |
153 | static const char s_macro_keyword[] = "Misplaced syntactic keyword"; | |
154 | ||
2a6f7afe DH |
155 | /* Case or cond expressions must have at least one clause. If a case or cond |
156 | * expression without any clauses is detected, a 'Missing clauses' error is | |
157 | * signalled. */ | |
158 | static const char s_missing_clauses[] = "Missing clauses"; | |
159 | ||
609a8b86 DH |
160 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
161 | * last clause. If after the 'else' case clause further clauses are detected, | |
162 | * a 'Misplaced else clause' error is signalled. */ | |
163 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
164 | ||
2a6f7afe DH |
165 | /* If a case clause is detected that is not in the format |
166 | * (<label(s)> <expression1> <expression2> ...) | |
167 | * a 'Bad case clause' error is signalled. */ | |
168 | static const char s_bad_case_clause[] = "Bad case clause"; | |
169 | ||
2a6f7afe DH |
170 | /* If a case clause is detected where the <label(s)> element is neither a |
171 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
172 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
173 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
174 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
175 | * local or global environment, it is not considered a syntactic keyword, but | |
176 | * will be treated as any other variable. */ | |
177 | static const char s_bad_case_labels[] = "Bad case labels"; | |
178 | ||
179 | /* In a case statement all labels have to be distinct. If in a case statement | |
180 | * a label occurs more than once, a 'Duplicate case label' error is | |
181 | * signalled. */ | |
182 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
183 | ||
609a8b86 DH |
184 | /* If a cond clause is detected that is not in one of the formats |
185 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
186 | * a 'Bad cond clause' error is signalled. */ | |
187 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
188 | ||
189 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
190 | * not hold a recipient element for the test result, a 'Missing recipient' | |
191 | * error is signalled. */ | |
192 | static const char s_missing_recipient[] = "Missing recipient in"; | |
193 | ||
cc56ba80 DH |
194 | /* If in a position where a variable name is required some other object is |
195 | * detected, a 'Bad variable' error is signalled. */ | |
196 | static const char s_bad_variable[] = "Bad variable"; | |
197 | ||
a954ce1d DH |
198 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
199 | * possibly empty list. If any other object is detected in a place where a | |
200 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
201 | static const char s_bad_bindings[] = "Bad bindings"; | |
202 | ||
203 | /* Depending on the syntactic context, a binding has to be in the format | |
204 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
205 | * If anything else is detected in a place where a binding was expected, a | |
206 | * 'Bad binding' error is signalled. */ | |
207 | static const char s_bad_binding[] = "Bad binding"; | |
208 | ||
4610b011 DH |
209 | /* Some syntactic forms don't allow variable names to appear more than once in |
210 | * a list of bindings. If such a situation is nevertheless detected, a | |
211 | * 'Duplicate binding' error is signalled. */ | |
212 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
213 | ||
a954ce1d DH |
214 | /* If the exit form of a 'do' expression is not in the format |
215 | * (<test> <expression> ...) | |
216 | * a 'Bad exit clause' error is signalled. */ | |
217 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
218 | ||
03a3e941 DH |
219 | /* The formal function arguments of a lambda expression have to be either a |
220 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
221 | * error is signalled. */ | |
222 | static const char s_bad_formals[] = "Bad formals"; | |
223 | ||
224 | /* If in a lambda expression something else than a symbol is detected at a | |
225 | * place where a formal function argument is required, a 'Bad formal' error is | |
226 | * signalled. */ | |
227 | static const char s_bad_formal[] = "Bad formal"; | |
228 | ||
229 | /* If in the arguments list of a lambda expression an argument name occurs | |
230 | * more than once, a 'Duplicate formal' error is signalled. */ | |
231 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
232 | ||
6f81708a DH |
233 | /* If the evaluation of an unquote-splicing expression gives something else |
234 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
235 | * signalled. */ | |
236 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
237 | ||
9a848baf DH |
238 | /* If something else than an exact integer is detected as the argument for |
239 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
240 | static const char s_bad_slot_number[] = "Bad slot number"; | |
241 | ||
e6729603 DH |
242 | |
243 | /* Signal a syntax error. We distinguish between the form that caused the | |
244 | * error and the enclosing expression. The error message will print out as | |
245 | * shown in the following pattern. The file name and line number are only | |
246 | * given when they can be determined from the erroneous form or from the | |
247 | * enclosing expression. | |
248 | * | |
249 | * <filename>: In procedure memoization: | |
250 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
251 | ||
252 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
253 | ||
254 | /* The prototype is needed to indicate that the function does not return. */ | |
255 | static void | |
256 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
257 | ||
258 | static void | |
259 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
260 | { | |
261 | const SCM msg_string = scm_makfrom0str (msg); | |
262 | SCM filename = SCM_BOOL_F; | |
263 | SCM linenr = SCM_BOOL_F; | |
264 | const char *format; | |
265 | SCM args; | |
266 | ||
267 | if (SCM_CONSP (form)) | |
268 | { | |
269 | filename = scm_source_property (form, scm_sym_filename); | |
270 | linenr = scm_source_property (form, scm_sym_line); | |
271 | } | |
272 | ||
273 | if (SCM_FALSEP (filename) && SCM_FALSEP (linenr) && SCM_CONSP (expr)) | |
274 | { | |
275 | filename = scm_source_property (expr, scm_sym_filename); | |
276 | linenr = scm_source_property (expr, scm_sym_line); | |
277 | } | |
278 | ||
279 | if (!SCM_UNBNDP (expr)) | |
280 | { | |
281 | if (!SCM_FALSEP (filename)) | |
282 | { | |
283 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
284 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
285 | } | |
286 | else if (!SCM_FALSEP (linenr)) | |
287 | { | |
288 | format = "In line ~S: ~A ~S in expression ~S."; | |
289 | args = scm_list_4 (linenr, msg_string, form, expr); | |
290 | } | |
291 | else | |
292 | { | |
293 | format = "~A ~S in expression ~S."; | |
294 | args = scm_list_3 (msg_string, form, expr); | |
295 | } | |
296 | } | |
297 | else | |
298 | { | |
299 | if (!SCM_FALSEP (filename)) | |
300 | { | |
301 | format = "In file ~S, line ~S: ~A ~S."; | |
302 | args = scm_list_4 (filename, linenr, msg_string, form); | |
303 | } | |
304 | else if (!SCM_FALSEP (linenr)) | |
305 | { | |
306 | format = "In line ~S: ~A ~S."; | |
307 | args = scm_list_3 (linenr, msg_string, form); | |
308 | } | |
309 | else | |
310 | { | |
311 | format = "~A ~S."; | |
312 | args = scm_list_2 (msg_string, form); | |
313 | } | |
314 | } | |
315 | ||
316 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
317 | } | |
318 | ||
319 | ||
320 | /* Shortcut macros to simplify syntax error handling. */ | |
321 | #define ASSERT_SYNTAX(cond, message, form) \ | |
322 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
323 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
324 | { if (!(cond)) syntax_error (message, form, expr); } | |
325 | ||
326 | \f | |
327 | ||
d0624e39 DH |
328 | /* {Ilocs} |
329 | * | |
330 | * Ilocs are memoized references to variables in local environment frames. | |
331 | * They are represented as three values: The relative offset of the | |
332 | * environment frame, the number of the binding within that frame, and a | |
333 | * boolean value indicating whether the binding is the last binding in the | |
334 | * frame. | |
335 | */ | |
7e6e6b37 | 336 | |
d0624e39 | 337 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) |
7e6e6b37 DH |
338 | #define SCM_IFRINC (0x00000100L) |
339 | #define SCM_ICDR (0x00080000L) | |
d0624e39 | 340 | #define SCM_IDINC (0x00100000L) |
7e6e6b37 DH |
341 | #define SCM_IFRAME(n) ((long)((SCM_ICDR-SCM_IFRINC)>>8) \ |
342 | & (SCM_UNPACK (n) >> 8)) | |
343 | #define SCM_IDIST(n) (SCM_UNPACK (n) >> 20) | |
344 | #define SCM_ICDRP(n) (SCM_ICDR & SCM_UNPACK (n)) | |
d0624e39 DH |
345 | #define SCM_IDSTMSK (-SCM_IDINC) |
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); | |
365 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, | |
366 | (SCM frame, SCM binding, SCM cdrp), | |
367 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
368 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
369 | #define FUNC_NAME s_scm_dbg_make_iloc | |
370 | { | |
371 | SCM_VALIDATE_INUM (1, frame); | |
372 | SCM_VALIDATE_INUM (2, binding); | |
373 | return SCM_MAKE_ILOC (SCM_INUM (frame), | |
374 | SCM_INUM (binding), | |
375 | !SCM_FALSEP (cdrp)); | |
376 | } | |
377 | #undef FUNC_NAME | |
378 | ||
379 | SCM scm_dbg_iloc_p (SCM obj); | |
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 | { | |
385 | return SCM_BOOL (SCM_ILOCP (obj)); | |
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 | |
443 | * returned. If the symbol is a syntactic keyword, the macro object to which | |
444 | * the symbol is bound is returned. If the symbol is a global variable, the | |
445 | * variable object to which the symbol is bound is returned. Finally, if the | |
446 | * symbol is a local variable the corresponding iloc object is returned. */ | |
6f81708a DH |
447 | |
448 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
449 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
450 | * is unbound, it returns a macro object if the symbol is a syntactic keyword | |
451 | * and it returns a variable object if the symbol is a global variable. */ | |
452 | static SCM | |
453 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
454 | { | |
455 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
456 | if (SCM_FALSEP (variable)) | |
457 | { | |
458 | return SCM_UNDEFINED; | |
459 | } | |
460 | else | |
461 | { | |
462 | const SCM value = SCM_VARIABLE_REF (variable); | |
463 | if (SCM_MACROP (value)) | |
464 | return value; | |
465 | else | |
466 | return variable; | |
467 | } | |
468 | } | |
469 | ||
470 | static SCM | |
471 | lookup_symbol (const SCM symbol, const SCM env) | |
472 | { | |
473 | SCM frame_idx; | |
474 | unsigned int frame_nr; | |
475 | ||
476 | for (frame_idx = env, frame_nr = 0; | |
477 | !SCM_NULLP (frame_idx); | |
478 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) | |
479 | { | |
480 | const SCM frame = SCM_CAR (frame_idx); | |
481 | if (SCM_CONSP (frame)) | |
482 | { | |
483 | /* frame holds a local environment frame */ | |
484 | SCM symbol_idx; | |
485 | unsigned int symbol_nr; | |
486 | ||
487 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
488 | SCM_CONSP (symbol_idx); | |
489 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) | |
490 | { | |
491 | if (SCM_EQ_P (SCM_CAR (symbol_idx), symbol)) | |
492 | /* found the symbol, therefore return the iloc */ | |
493 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
494 | } | |
495 | if (SCM_EQ_P (symbol_idx, symbol)) | |
496 | /* found the symbol as the last element of the current frame */ | |
497 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
498 | } | |
499 | else | |
500 | { | |
501 | /* no more local environment frames */ | |
502 | return lookup_global_symbol (symbol, frame); | |
503 | } | |
504 | } | |
505 | ||
506 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
507 | } | |
508 | ||
509 | ||
510 | /* Return true if the symbol is - from the point of view of a macro | |
511 | * transformer - a literal in the sense specified in chapter "pattern | |
512 | * language" of R5RS. In the code below, however, we don't match the | |
513 | * definition of R5RS exactly: It returns true if the identifier has no | |
514 | * binding or if it is a syntactic keyword. */ | |
515 | static int | |
516 | literal_p (const SCM symbol, const SCM env) | |
517 | { | |
518 | const SCM value = lookup_symbol (symbol, env); | |
519 | if (SCM_UNBNDP (value) || SCM_MACROP (value)) | |
520 | return 1; | |
521 | else | |
522 | return 0; | |
523 | } | |
17fa3fcf | 524 | |
5fb64383 DH |
525 | |
526 | /* Return true if the expression is self-quoting in the memoized code. Thus, | |
527 | * some other objects (like e. g. vectors) are reported as self-quoting, which | |
528 | * according to R5RS would need to be quoted. */ | |
529 | static int | |
530 | is_self_quoting_p (const SCM expr) | |
531 | { | |
532 | if (SCM_CONSP (expr)) | |
533 | return 0; | |
534 | else if (SCM_SYMBOLP (expr)) | |
535 | return 0; | |
536 | else if (SCM_NULLP (expr)) | |
537 | return 0; | |
538 | else return 1; | |
539 | } | |
540 | ||
0f2d19dd | 541 | |
34adf7ea DH |
542 | /* Rewrite the body (which is given as the list of expressions forming the |
543 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
544 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
545 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
546 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 547 | * SCM_IM_LET, etc. |
34adf7ea DH |
548 | * |
549 | * It is assumed that the calling expression has already made sure that the | |
550 | * body is a proper list. */ | |
26d5b9b4 | 551 | static SCM |
430b8401 | 552 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 553 | { |
26d5b9b4 | 554 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
555 | if (SCM_ISYMP (SCM_CAR (exprs))) |
556 | return exprs; | |
557 | else | |
558 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
559 | } |
560 | ||
1cc91f1b | 561 | |
9d4bf6d3 MV |
562 | /* The function m_expand_body memoizes a proper list of expressions |
563 | * forming a body. This function takes care of dealing with internal | |
564 | * defines and transforming them into an equivalent letrec expression. | |
565 | * The list of expressions is rewritten in place. */ | |
910b5125 DH |
566 | |
567 | /* This is a helper function for m_expand_body. It helps to figure out whether | |
568 | * an expression denotes a syntactic keyword. */ | |
569 | static SCM | |
570 | try_macro_lookup (const SCM expr, const SCM env) | |
571 | { | |
572 | if (SCM_SYMBOLP (expr)) | |
573 | { | |
6f81708a | 574 | const SCM value = lookup_symbol (expr, env); |
910b5125 DH |
575 | return value; |
576 | } | |
577 | else | |
578 | { | |
579 | return SCM_UNDEFINED; | |
580 | } | |
581 | } | |
582 | ||
583 | /* This is a helper function for m_expand_body. It expands user macros, | |
584 | * because for the correct translation of a body we need to know whether they | |
585 | * expand to a definition. */ | |
586 | static SCM | |
587 | expand_user_macros (SCM expr, const SCM env) | |
588 | { | |
589 | while (SCM_CONSP (expr)) | |
590 | { | |
591 | const SCM car_expr = SCM_CAR (expr); | |
592 | const SCM new_car = expand_user_macros (car_expr, env); | |
593 | const SCM value = try_macro_lookup (new_car, env); | |
594 | ||
595 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
596 | { | |
597 | /* User macros transform code into code. */ | |
598 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
599 | /* We need to reiterate on the transformed code. */ | |
600 | } | |
601 | else | |
602 | { | |
603 | /* No user macro: return. */ | |
604 | SCM_SETCAR (expr, new_car); | |
605 | return expr; | |
606 | } | |
607 | } | |
608 | ||
609 | return expr; | |
610 | } | |
611 | ||
612 | /* This is a helper function for m_expand_body. It determines if a given form | |
613 | * represents an application of a given built-in macro. The built-in macro to | |
614 | * check for is identified by its syntactic keyword. The form is an | |
615 | * application of the given macro if looking up the car of the form in the | |
616 | * given environment actually returns the built-in macro. */ | |
617 | static int | |
618 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
619 | { | |
620 | if (SCM_CONSP (form)) | |
621 | { | |
622 | const SCM car_form = SCM_CAR (form); | |
623 | const SCM value = try_macro_lookup (car_form, env); | |
624 | if (SCM_BUILTIN_MACRO_P (value)) | |
625 | { | |
626 | const SCM macro_name = scm_macro_name (value); | |
627 | return SCM_EQ_P (macro_name, syntactic_keyword); | |
628 | } | |
629 | } | |
630 | ||
631 | return 0; | |
632 | } | |
633 | ||
9d4bf6d3 | 634 | static void |
910b5125 DH |
635 | m_expand_body (const SCM forms, const SCM env) |
636 | { | |
637 | /* The first body form can be skipped since it is known to be the ISYM that | |
638 | * was prepended to the body by m_body. */ | |
639 | SCM cdr_forms = SCM_CDR (forms); | |
640 | SCM form_idx = cdr_forms; | |
641 | SCM definitions = SCM_EOL; | |
642 | SCM sequence = SCM_EOL; | |
643 | ||
644 | /* According to R5RS, the list of body forms consists of two parts: a number | |
645 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
646 | * expressions. Each the definitions and the expressions may be grouped | |
647 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
648 | * expressions. The task of the following loop therefore is to split the | |
649 | * list of body forms into the list of definitions and the sequence of | |
650 | * expressions. */ | |
651 | while (!SCM_NULLP (form_idx)) | |
652 | { | |
653 | const SCM form = SCM_CAR (form_idx); | |
654 | const SCM new_form = expand_user_macros (form, env); | |
655 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
656 | { | |
657 | definitions = scm_cons (new_form, definitions); | |
658 | form_idx = SCM_CDR (form_idx); | |
659 | } | |
660 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
661 | { | |
662 | /* We have encountered a group of forms. This has to be either a | |
663 | * (possibly empty) group of (possibly further grouped) definitions, | |
664 | * or a non-empty group of (possibly further grouped) | |
665 | * expressions. */ | |
666 | const SCM grouped_forms = SCM_CDR (new_form); | |
667 | unsigned int found_definition = 0; | |
668 | unsigned int found_expression = 0; | |
669 | SCM grouped_form_idx = grouped_forms; | |
670 | while (!found_expression && !SCM_NULLP (grouped_form_idx)) | |
671 | { | |
672 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
673 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
674 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
675 | { | |
676 | found_definition = 1; | |
677 | definitions = scm_cons (new_inner_form, definitions); | |
678 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
679 | } | |
680 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
681 | { | |
682 | const SCM inner_group = SCM_CDR (new_inner_form); | |
683 | grouped_form_idx | |
684 | = scm_append (scm_list_2 (inner_group, | |
685 | SCM_CDR (grouped_form_idx))); | |
686 | } | |
687 | else | |
688 | { | |
689 | /* The group marks the start of the expressions of the body. | |
690 | * We have to make sure that within the same group we have | |
691 | * not encountered a definition before. */ | |
692 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
693 | found_expression = 1; | |
694 | grouped_form_idx = SCM_EOL; | |
695 | } | |
696 | } | |
697 | ||
698 | /* We have finished processing the group. If we have not yet | |
699 | * encountered an expression we continue processing the forms of the | |
700 | * body to collect further definition forms. Otherwise, the group | |
701 | * marks the start of the sequence of expressions of the body. */ | |
702 | if (!found_expression) | |
703 | { | |
704 | form_idx = SCM_CDR (form_idx); | |
705 | } | |
706 | else | |
707 | { | |
708 | sequence = form_idx; | |
709 | form_idx = SCM_EOL; | |
710 | } | |
711 | } | |
712 | else | |
713 | { | |
714 | /* We have detected a form which is no definition. This marks the | |
715 | * start of the sequence of expressions of the body. */ | |
716 | sequence = form_idx; | |
717 | form_idx = SCM_EOL; | |
718 | } | |
719 | } | |
720 | ||
721 | /* FIXME: forms does not hold information about the file location. */ | |
722 | ASSERT_SYNTAX (SCM_CONSP (sequence), s_missing_body_expression, cdr_forms); | |
723 | ||
724 | if (!SCM_NULLP (definitions)) | |
725 | { | |
726 | SCM definition_idx; | |
727 | SCM letrec_tail; | |
728 | SCM letrec_expression; | |
729 | SCM new_letrec_expression; | |
910b5125 DH |
730 | |
731 | SCM bindings = SCM_EOL; | |
732 | for (definition_idx = definitions; | |
733 | !SCM_NULLP (definition_idx); | |
734 | definition_idx = SCM_CDR (definition_idx)) | |
735 | { | |
736 | const SCM definition = SCM_CAR (definition_idx); | |
737 | const SCM canonical_definition = canonicalize_define (definition); | |
738 | const SCM binding = SCM_CDR (canonical_definition); | |
739 | bindings = scm_cons (binding, bindings); | |
740 | }; | |
741 | ||
742 | letrec_tail = scm_cons (bindings, sequence); | |
743 | /* FIXME: forms does not hold information about the file location. */ | |
744 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
745 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
746 | SCM_SETCAR (forms, new_letrec_expression); |
747 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
748 | } |
749 | else | |
750 | { | |
751 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
752 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
753 | } |
754 | } | |
755 | ||
910b5125 | 756 | |
9fbee57e | 757 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
758 | |
759 | ||
3b88ed2a | 760 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 761 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 762 | |
8ea46249 | 763 | SCM |
e6729603 | 764 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 765 | { |
e6729603 DH |
766 | const SCM cdr_expr = SCM_CDR (expr); |
767 | const long length = scm_ilength (cdr_expr); | |
768 | ||
769 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
770 | ||
771 | if (length == 0) | |
772 | { | |
773 | /* Special case: (and) is replaced by #t. */ | |
774 | return SCM_BOOL_T; | |
775 | } | |
0f2d19dd | 776 | else |
e6729603 DH |
777 | { |
778 | SCM_SETCAR (expr, SCM_IM_AND); | |
779 | return expr; | |
780 | } | |
0f2d19dd JB |
781 | } |
782 | ||
1cc91f1b | 783 | |
3b88ed2a | 784 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 785 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
786 | |
787 | SCM | |
2a6f7afe | 788 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 789 | { |
2a6f7afe | 790 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
791 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
792 | * That means, there should be a distinction between uses of begin where an | |
793 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
794 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
795 | ||
796 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
797 | return expr; | |
0f2d19dd JB |
798 | } |
799 | ||
800 | ||
3b88ed2a | 801 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 802 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 803 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 804 | |
8ea46249 | 805 | SCM |
2a6f7afe | 806 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 807 | { |
8ea46249 | 808 | SCM clauses; |
2a6f7afe DH |
809 | SCM all_labels = SCM_EOL; |
810 | ||
811 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
812 | const int else_literal_p = literal_p (scm_sym_else, env); | |
813 | ||
814 | const SCM cdr_expr = SCM_CDR (expr); | |
815 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
816 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
817 | ||
818 | clauses = SCM_CDR (cdr_expr); | |
8ea46249 | 819 | while (!SCM_NULLP (clauses)) |
0f2d19dd | 820 | { |
2a6f7afe DH |
821 | SCM labels; |
822 | ||
823 | const SCM clause = SCM_CAR (clauses); | |
824 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
825 | s_bad_case_clause, clause, expr); | |
826 | ||
827 | labels = SCM_CAR (clause); | |
828 | if (SCM_CONSP (labels)) | |
829 | { | |
830 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
831 | s_bad_case_labels, labels, expr); | |
832 | all_labels = scm_append_x (scm_list_2 (labels, all_labels)); | |
833 | } | |
58a2510b DH |
834 | else if (SCM_NULLP (labels)) |
835 | { | |
836 | /* The list of labels is empty. According to R5RS this is allowed. | |
837 | * It means that the sequence of expressions will never be executed. | |
838 | * Therefore, as an optimization, we could remove the whole | |
839 | * clause. */ | |
840 | } | |
2a6f7afe DH |
841 | else |
842 | { | |
843 | ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p, | |
844 | s_bad_case_labels, labels, expr); | |
845 | ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)), | |
609a8b86 | 846 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
847 | } |
848 | ||
849 | /* build the new clause */ | |
850 | if (SCM_EQ_P (labels, scm_sym_else)) | |
851 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
852 | ||
8ea46249 | 853 | clauses = SCM_CDR (clauses); |
0f2d19dd | 854 | } |
2a6f7afe DH |
855 | |
856 | /* Check whether all case labels are distinct. */ | |
857 | for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels)) | |
858 | { | |
859 | const SCM label = SCM_CAR (all_labels); | |
4610b011 DH |
860 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (label, SCM_CDR (all_labels))), |
861 | s_duplicate_case_label, label, expr); | |
2a6f7afe DH |
862 | } |
863 | ||
864 | SCM_SETCAR (expr, SCM_IM_CASE); | |
865 | return expr; | |
0f2d19dd JB |
866 | } |
867 | ||
868 | ||
3b88ed2a | 869 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 870 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 871 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 872 | |
8ea46249 | 873 | SCM |
609a8b86 | 874 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 875 | { |
609a8b86 DH |
876 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
877 | const int else_literal_p = literal_p (scm_sym_else, env); | |
878 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
879 | ||
880 | const SCM clauses = SCM_CDR (expr); | |
881 | SCM clause_idx; | |
882 | ||
883 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
884 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
885 | ||
886 | for (clause_idx = clauses; | |
887 | !SCM_NULLP (clause_idx); | |
888 | clause_idx = SCM_CDR (clause_idx)) | |
0f2d19dd | 889 | { |
609a8b86 DH |
890 | SCM test; |
891 | ||
892 | const SCM clause = SCM_CAR (clause_idx); | |
893 | const long length = scm_ilength (clause); | |
894 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
895 | ||
896 | test = SCM_CAR (clause); | |
897 | if (SCM_EQ_P (test, scm_sym_else) && else_literal_p) | |
0f2d19dd | 898 | { |
609a8b86 DH |
899 | const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx)); |
900 | ASSERT_SYNTAX_2 (length >= 2, | |
901 | s_bad_cond_clause, clause, expr); | |
902 | ASSERT_SYNTAX_2 (last_clause_p, | |
903 | s_misplaced_else_clause, clause, expr); | |
904 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 905 | } |
609a8b86 DH |
906 | else if (length >= 2 |
907 | && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow) | |
908 | && arrow_literal_p) | |
909 | { | |
910 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
911 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
912 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 913 | } |
0f2d19dd | 914 | } |
609a8b86 DH |
915 | |
916 | SCM_SETCAR (expr, SCM_IM_COND); | |
917 | return expr; | |
0f2d19dd JB |
918 | } |
919 | ||
1cc91f1b | 920 | |
0f572ba7 DH |
921 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
922 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 923 | |
9fbee57e DH |
924 | /* Guile provides an extension to R5RS' define syntax to represent function |
925 | * currying in a compact way. With this extension, it is allowed to write | |
926 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
927 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
928 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
929 | * should be either a sequence of zero or more variables, or a sequence of one | |
930 | * or more variables followed by a space-delimited period and another | |
931 | * variable. Each level of argument nesting wraps the <body> within another | |
932 | * lambda expression. For example, the following forms are allowed, each one | |
933 | * followed by an equivalent, more explicit implementation. | |
934 | * Example 1: | |
935 | * (define ((a b . c) . d) <body>) is equivalent to | |
936 | * (define a (lambda (b . c) (lambda d <body>))) | |
937 | * Example 2: | |
938 | * (define (((a) b) c . d) <body>) is equivalent to | |
939 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
940 | */ | |
941 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
942 | * module that does not implement this extension. */ | |
0f572ba7 DH |
943 | static SCM |
944 | canonicalize_define (const SCM expr) | |
5280aaca | 945 | { |
cc56ba80 DH |
946 | SCM body; |
947 | SCM variable; | |
948 | ||
949 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 950 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
951 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
952 | ||
953 | body = SCM_CDR (cdr_expr); | |
954 | variable = SCM_CAR (cdr_expr); | |
955 | while (SCM_CONSP (variable)) | |
5280aaca | 956 | { |
cc56ba80 DH |
957 | /* This while loop realizes function currying by variable nesting. |
958 | * Variable is known to be a nested-variable. In every iteration of the | |
959 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
960 | * innermost one. Note that we don't check for duplicate formals here: |
961 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
962 | const SCM formals = SCM_CDR (variable); |
963 | const SCM tail = scm_cons (formals, body); | |
964 | ||
965 | /* Add source properties to each new lambda expression: */ | |
966 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
967 | ||
968 | body = scm_list_1 (lambda); | |
969 | variable = SCM_CAR (variable); | |
5280aaca | 970 | } |
cc56ba80 DH |
971 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); |
972 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
973 | ||
0f572ba7 DH |
974 | SCM_SETCAR (cdr_expr, variable); |
975 | SCM_SETCDR (cdr_expr, body); | |
976 | return expr; | |
977 | } | |
978 | ||
36245b66 DH |
979 | /* According to section 5.2.1 of R5RS we first have to make sure that the |
980 | * variable is bound, and then perform the (set! variable expression) | |
981 | * operation. This means, that within the expression we may already assign | |
982 | * values to variable: (define foo (begin (set! foo 1) (+ foo 1))) */ | |
0f572ba7 DH |
983 | SCM |
984 | scm_m_define (SCM expr, SCM env) | |
985 | { | |
6bff1368 | 986 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 987 | |
6bff1368 DH |
988 | { |
989 | const SCM canonical_definition = canonicalize_define (expr); | |
990 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
991 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
36245b66 DH |
992 | const SCM location |
993 | = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); | |
994 | const SCM value = scm_eval_car (SCM_CDR (cdr_canonical_definition), env); | |
6bff1368 | 995 | |
6bff1368 DH |
996 | if (SCM_REC_PROCNAMES_P) |
997 | { | |
998 | SCM tmp = value; | |
999 | while (SCM_MACROP (tmp)) | |
1000 | tmp = SCM_MACRO_CODE (tmp); | |
1001 | if (SCM_CLOSUREP (tmp) | |
1002 | /* Only the first definition determines the name. */ | |
1003 | && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name))) | |
1004 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); | |
1005 | } | |
0f572ba7 | 1006 | |
36245b66 | 1007 | SCM_VARIABLE_SET (location, value); |
6bff1368 DH |
1008 | |
1009 | return SCM_UNSPECIFIED; | |
1010 | } | |
0f2d19dd JB |
1011 | } |
1012 | ||
1013 | ||
8ae95199 DH |
1014 | /* This is a helper function for forms (<keyword> <expression>) that are |
1015 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1016 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1017 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1018 | static SCM | |
1019 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1020 | { | |
1021 | const SCM cdr_expr = SCM_CDR (expr); | |
1022 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1023 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1024 | ||
1025 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1026 | ||
1027 | return expr; | |
1028 | } | |
1029 | ||
1030 | ||
3b88ed2a | 1031 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1032 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1033 | |
9fbee57e DH |
1034 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1035 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1036 | * the empty list represents the empty parameter list. This representation | |
1037 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1038 | SCM |
8ae95199 | 1039 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1040 | { |
8ae95199 DH |
1041 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1042 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1043 | return new_expr; | |
0f2d19dd JB |
1044 | } |
1045 | ||
8ea46249 | 1046 | |
a954ce1d DH |
1047 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1048 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1049 | ||
302c12b4 | 1050 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1051 | * reversed here. During the evaluation this allows for simple consing of the |
1052 | * results of the inits and steps: | |
302c12b4 | 1053 | |
0f2d19dd | 1054 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1055 | (<var2> <init2>) |
1056 | ... ) | |
1057 | (<test> <return>) | |
1058 | <body>) | |
302c12b4 | 1059 | |
0f2d19dd | 1060 | ;; becomes |
302c12b4 | 1061 | |
e681d187 | 1062 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1063 | (varn ... var2 var1) |
1064 | (<test> <return>) | |
1065 | (<body>) | |
1066 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1067 | */ |
0f2d19dd | 1068 | SCM |
a954ce1d | 1069 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1070 | { |
a954ce1d DH |
1071 | SCM variables = SCM_EOL; |
1072 | SCM init_forms = SCM_EOL; | |
1073 | SCM step_forms = SCM_EOL; | |
1074 | SCM binding_idx; | |
1075 | SCM cddr_expr; | |
1076 | SCM exit_clause; | |
1077 | SCM commands; | |
1078 | SCM tail; | |
1079 | ||
1080 | const SCM cdr_expr = SCM_CDR (expr); | |
1081 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1082 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1083 | ||
1084 | /* Collect variables, init and step forms. */ | |
1085 | binding_idx = SCM_CAR (cdr_expr); | |
1086 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1087 | s_bad_bindings, binding_idx, expr); | |
1088 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1089 | { |
a954ce1d DH |
1090 | const SCM binding = SCM_CAR (binding_idx); |
1091 | const long length = scm_ilength (binding); | |
1092 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1093 | s_bad_binding, binding, expr); | |
1094 | ||
302c12b4 | 1095 | { |
a954ce1d DH |
1096 | const SCM name = SCM_CAR (binding); |
1097 | const SCM init = SCM_CADR (binding); | |
1098 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
1099 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
4610b011 DH |
1100 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, variables)), |
1101 | s_duplicate_binding, name, expr); | |
1102 | ||
a954ce1d DH |
1103 | variables = scm_cons (name, variables); |
1104 | init_forms = scm_cons (init, init_forms); | |
1105 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1106 | } |
0f2d19dd | 1107 | } |
a954ce1d DH |
1108 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1109 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1110 | ||
1111 | /* Memoize the test form and the exit sequence. */ | |
1112 | cddr_expr = SCM_CDR (cdr_expr); | |
1113 | exit_clause = SCM_CAR (cddr_expr); | |
1114 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1115 | s_bad_exit_clause, exit_clause, expr); | |
1116 | ||
1117 | commands = SCM_CDR (cddr_expr); | |
1118 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1119 | tail = scm_cons2 (init_forms, variables, tail); | |
1120 | SCM_SETCAR (expr, SCM_IM_DO); | |
1121 | SCM_SETCDR (expr, tail); | |
1122 | return expr; | |
0f2d19dd JB |
1123 | } |
1124 | ||
b8229a3b | 1125 | |
3b88ed2a | 1126 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1127 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1128 | |
9fbee57e | 1129 | SCM |
4610b011 | 1130 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1131 | { |
4610b011 DH |
1132 | const SCM cdr_expr = SCM_CDR (expr); |
1133 | const long length = scm_ilength (cdr_expr); | |
1134 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1135 | SCM_SETCAR (expr, SCM_IM_IF); | |
1136 | return expr; | |
0f2d19dd JB |
1137 | } |
1138 | ||
302c12b4 | 1139 | |
3b88ed2a | 1140 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1141 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1142 | |
4610b011 DH |
1143 | /* A helper function for memoize_lambda to support checking for duplicate |
1144 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1145 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1146 | * forms that a formal argument can have: | |
1147 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1148 | static int |
4610b011 | 1149 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1150 | { |
9fbee57e DH |
1151 | for (; SCM_CONSP (list); list = SCM_CDR (list)) |
1152 | { | |
1153 | if (SCM_EQ_P (SCM_CAR (list), obj)) | |
4610b011 | 1154 | return 1; |
9fbee57e DH |
1155 | } |
1156 | return SCM_EQ_P (list, obj); | |
5cb22e96 DH |
1157 | } |
1158 | ||
28d52ebb | 1159 | SCM |
03a3e941 | 1160 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1161 | { |
9fbee57e | 1162 | SCM formals; |
03a3e941 | 1163 | SCM formals_idx; |
34adf7ea DH |
1164 | SCM cddr_expr; |
1165 | int documentation; | |
1166 | SCM body; | |
1167 | SCM new_body; | |
03a3e941 DH |
1168 | |
1169 | const SCM cdr_expr = SCM_CDR (expr); | |
1170 | const long length = scm_ilength (cdr_expr); | |
1171 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1172 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1173 | |
03a3e941 DH |
1174 | /* Before iterating the list of formal arguments, make sure the formals |
1175 | * actually are given as either a symbol or a non-cyclic list. */ | |
1176 | formals = SCM_CAR (cdr_expr); | |
1177 | if (SCM_CONSP (formals)) | |
1178 | { | |
1179 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1180 | * detected, report a 'Bad formals' error. */ | |
1181 | } | |
1182 | else | |
1183 | { | |
1184 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formals) || SCM_NULLP (formals), | |
1185 | s_bad_formals, formals, expr); | |
1186 | } | |
1cc91f1b | 1187 | |
03a3e941 DH |
1188 | /* Now iterate the list of formal arguments to check if all formals are |
1189 | * symbols, and that there are no duplicates. */ | |
1190 | formals_idx = formals; | |
1191 | while (SCM_CONSP (formals_idx)) | |
0f2d19dd | 1192 | { |
03a3e941 DH |
1193 | const SCM formal = SCM_CAR (formals_idx); |
1194 | const SCM next_idx = SCM_CDR (formals_idx); | |
1195 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formal), s_bad_formal, formal, expr); | |
1196 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), | |
1197 | s_duplicate_formal, formal, expr); | |
1198 | formals_idx = next_idx; | |
0f2d19dd | 1199 | } |
03a3e941 DH |
1200 | ASSERT_SYNTAX_2 (SCM_NULLP (formals_idx) || SCM_SYMBOLP (formals_idx), |
1201 | s_bad_formal, formals_idx, expr); | |
9fbee57e | 1202 | |
34adf7ea DH |
1203 | /* Memoize the body. Keep a potential documentation string. */ |
1204 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1205 | * some external database. Otherwise it will slow down execution, since | |
1206 | * the documentation string will have to be skipped with every execution | |
1207 | * of the closure. */ | |
1208 | cddr_expr = SCM_CDR (cdr_expr); | |
1209 | documentation = (length >= 3 && SCM_STRINGP (SCM_CAR (cddr_expr))); | |
1210 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; | |
430b8401 | 1211 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1212 | |
1213 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1214 | if (documentation) | |
1215 | SCM_SETCDR (cddr_expr, new_body); | |
1216 | else | |
1217 | SCM_SETCDR (cdr_expr, new_body); | |
1218 | return expr; | |
0f2d19dd | 1219 | } |
6dbd0af5 | 1220 | |
0f2d19dd | 1221 | |
d6754c23 | 1222 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1223 | static void |
d6754c23 | 1224 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1225 | { |
d6754c23 | 1226 | SCM binding_idx; |
302c12b4 | 1227 | |
d6754c23 DH |
1228 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1229 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1230 | |
d6754c23 DH |
1231 | binding_idx = bindings; |
1232 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1233 | { |
d6754c23 DH |
1234 | SCM name; /* const */ |
1235 | ||
1236 | const SCM binding = SCM_CAR (binding_idx); | |
1237 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1238 | s_bad_binding, binding, expr); | |
1239 | ||
1240 | name = SCM_CAR (binding); | |
1241 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
0f2d19dd | 1242 | } |
d6754c23 | 1243 | } |
26d5b9b4 | 1244 | |
d6754c23 DH |
1245 | |
1246 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1247 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1248 | * variables are returned in a list with their order reversed, and the init | |
1249 | * forms are returned in a list in the same order as they are given in the | |
1250 | * bindings. If a duplicate variable name is detected, an error is | |
1251 | * signalled. */ | |
1252 | static void | |
1253 | transform_bindings ( | |
1254 | const SCM bindings, const SCM expr, | |
1255 | SCM *const rvarptr, SCM *const initptr ) | |
1256 | { | |
1257 | SCM rvariables = SCM_EOL; | |
1258 | SCM rinits = SCM_EOL; | |
1259 | SCM binding_idx = bindings; | |
1260 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
1261 | { | |
1262 | const SCM binding = SCM_CAR (binding_idx); | |
1263 | const SCM cdr_binding = SCM_CDR (binding); | |
1264 | const SCM name = SCM_CAR (binding); | |
1265 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, rvariables)), | |
1266 | s_duplicate_binding, name, expr); | |
1267 | rvariables = scm_cons (name, rvariables); | |
1268 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1269 | } | |
1270 | *rvarptr = rvariables; | |
1271 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1272 | } |
1273 | ||
302c12b4 | 1274 | |
3b88ed2a | 1275 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1276 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1277 | |
d6754c23 DH |
1278 | /* This function is a helper function for memoize_let. It transforms |
1279 | * (let name ((var init) ...) body ...) into | |
1280 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1281 | * and memoizes the expression. It is assumed that the caller has checked | |
1282 | * that name is a symbol and that there are bindings and a body. */ | |
1283 | static SCM | |
1284 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1285 | { | |
1286 | SCM rvariables; | |
1287 | SCM variables; | |
1288 | SCM inits; | |
1289 | ||
1290 | const SCM cdr_expr = SCM_CDR (expr); | |
1291 | const SCM name = SCM_CAR (cdr_expr); | |
1292 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1293 | const SCM bindings = SCM_CAR (cddr_expr); | |
1294 | check_bindings (bindings, expr); | |
1295 | ||
1296 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1297 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1298 | ||
1299 | { | |
1300 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1301 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1302 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1303 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1304 | ||
1305 | const SCM rvar = scm_list_1 (name); | |
1306 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1307 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1308 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1309 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1310 | return scm_cons_source (expr, letrec_form, inits); | |
1311 | } | |
1312 | } | |
1313 | ||
1314 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1315 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1316 | SCM |
d6754c23 | 1317 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1318 | { |
d6754c23 DH |
1319 | SCM bindings; |
1320 | ||
1321 | const SCM cdr_expr = SCM_CDR (expr); | |
1322 | const long length = scm_ilength (cdr_expr); | |
1323 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1324 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1325 | |
d6754c23 DH |
1326 | bindings = SCM_CAR (cdr_expr); |
1327 | if (SCM_SYMBOLP (bindings)) | |
26d5b9b4 | 1328 | { |
d6754c23 DH |
1329 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1330 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1331 | } |
d6754c23 DH |
1332 | |
1333 | check_bindings (bindings, expr); | |
1334 | if (SCM_NULLP (bindings) || SCM_NULLP (SCM_CDR (bindings))) | |
26d5b9b4 | 1335 | { |
d6754c23 | 1336 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1337 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1338 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1339 | } |
302c12b4 DH |
1340 | else |
1341 | { | |
d6754c23 DH |
1342 | /* plain let */ |
1343 | SCM rvariables; | |
1344 | SCM inits; | |
1345 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1346 | |
302c12b4 | 1347 | { |
430b8401 | 1348 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1349 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1350 | SCM_SETCAR (expr, SCM_IM_LET); | |
1351 | SCM_SETCDR (expr, new_tail); | |
1352 | return expr; | |
302c12b4 DH |
1353 | } |
1354 | } | |
0f2d19dd JB |
1355 | } |
1356 | ||
1357 | ||
3b88ed2a | 1358 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1359 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1360 | |
d6754c23 DH |
1361 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1362 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1363 | SCM |
d6754c23 | 1364 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1365 | { |
d6754c23 | 1366 | SCM binding_idx; |
d6754c23 | 1367 | SCM new_body; |
0f2d19dd | 1368 | |
d6754c23 DH |
1369 | const SCM cdr_expr = SCM_CDR (expr); |
1370 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1371 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1372 | |
d6754c23 DH |
1373 | binding_idx = SCM_CAR (cdr_expr); |
1374 | check_bindings (binding_idx, expr); | |
1375 | ||
461bffb1 DH |
1376 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1377 | * transformation is done in place. At the beginning of one iteration of | |
1378 | * the loop the variable binding_idx holds the form | |
1379 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1380 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1381 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1382 | * untouched. After the execution of the loop, P1 will hold | |
1383 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1384 | * and binding_idx will hold P3. */ | |
1385 | while (!SCM_NULLP (binding_idx)) | |
9fbee57e | 1386 | { |
461bffb1 | 1387 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1388 | const SCM binding = SCM_CAR (binding_idx); |
1389 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1390 | const SCM cdr_binding = SCM_CDR (binding); |
1391 | ||
1392 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1393 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1394 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1395 | ||
1396 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1397 | } |
1398 | ||
430b8401 | 1399 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1400 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1401 | /* the bindings have been changed in place */ | |
1402 | SCM_SETCDR (cdr_expr, new_body); | |
1403 | return expr; | |
9fbee57e | 1404 | } |
b8229a3b | 1405 | |
0f2d19dd | 1406 | |
3b88ed2a | 1407 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); |
9fbee57e | 1408 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); |
1cc91f1b | 1409 | |
0f2d19dd | 1410 | SCM |
d6754c23 | 1411 | scm_m_letrec (SCM expr, SCM env) |
0f2d19dd | 1412 | { |
d6754c23 DH |
1413 | SCM bindings; |
1414 | ||
1415 | const SCM cdr_expr = SCM_CDR (expr); | |
1416 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1417 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1418 | ||
1419 | bindings = SCM_CAR (cdr_expr); | |
1420 | if (SCM_NULLP (bindings)) | |
9fbee57e | 1421 | { |
d6754c23 | 1422 | /* no bindings, let* is executed faster */ |
430b8401 | 1423 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1424 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); |
9fbee57e DH |
1425 | } |
1426 | else | |
1427 | { | |
d6754c23 DH |
1428 | SCM rvariables; |
1429 | SCM inits; | |
1430 | SCM new_body; | |
1431 | ||
1432 | check_bindings (bindings, expr); | |
1433 | transform_bindings (bindings, expr, &rvariables, &inits); | |
430b8401 | 1434 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1435 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); |
9fbee57e | 1436 | } |
0f2d19dd JB |
1437 | } |
1438 | ||
73b64342 | 1439 | |
3b88ed2a | 1440 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1441 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1442 | |
1443 | SCM | |
21628685 | 1444 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1445 | { |
21628685 DH |
1446 | const SCM cdr_expr = SCM_CDR (expr); |
1447 | const long length = scm_ilength (cdr_expr); | |
1448 | ||
1449 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1450 | ||
1451 | if (length == 0) | |
1452 | { | |
1453 | /* Special case: (or) is replaced by #f. */ | |
1454 | return SCM_BOOL_F; | |
1455 | } | |
9fbee57e | 1456 | else |
21628685 DH |
1457 | { |
1458 | SCM_SETCAR (expr, SCM_IM_OR); | |
1459 | return expr; | |
1460 | } | |
73b64342 MD |
1461 | } |
1462 | ||
73b64342 | 1463 | |
9fbee57e DH |
1464 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1465 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1466 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1467 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1468 | |
1469 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1470 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1471 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1472 | * nesting level and is known to be greater than zero. */ | |
1473 | static SCM | |
1474 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1475 | { |
9fbee57e | 1476 | if (SCM_CONSP (form)) |
c96d76b8 | 1477 | { |
21628685 | 1478 | const SCM tmp = SCM_CAR (form); |
9fbee57e DH |
1479 | if (SCM_EQ_P (tmp, scm_sym_quasiquote)) |
1480 | { | |
21628685 DH |
1481 | const SCM args = SCM_CDR (form); |
1482 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1483 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1484 | } | |
1485 | else if (SCM_EQ_P (tmp, scm_sym_unquote)) | |
1486 | { | |
21628685 DH |
1487 | const SCM args = SCM_CDR (form); |
1488 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1489 | if (depth - 1 == 0) |
1490 | return scm_eval_car (args, env); | |
1491 | else | |
1492 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1493 | } | |
1494 | else if (SCM_CONSP (tmp) | |
1495 | && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing)) | |
1496 | { | |
21628685 DH |
1497 | const SCM args = SCM_CDR (tmp); |
1498 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1499 | if (depth - 1 == 0) |
1500 | { | |
21628685 DH |
1501 | const SCM list = scm_eval_car (args, env); |
1502 | const SCM rest = SCM_CDR (form); | |
1503 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1504 | s_splicing, list, form); | |
9fbee57e DH |
1505 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1506 | } | |
1507 | else | |
1508 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1509 | iqq (SCM_CDR (form), env, depth)); | |
1510 | } | |
1511 | else | |
1512 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1513 | iqq (SCM_CDR (form), env, depth)); | |
1514 | } | |
1515 | else if (SCM_VECTORP (form)) | |
c96d76b8 | 1516 | { |
9fbee57e DH |
1517 | size_t i = SCM_VECTOR_LENGTH (form); |
1518 | SCM const *const data = SCM_VELTS (form); | |
1519 | SCM tmp = SCM_EOL; | |
1520 | while (i != 0) | |
1521 | tmp = scm_cons (data[--i], tmp); | |
1522 | scm_remember_upto_here_1 (form); | |
1523 | return scm_vector (iqq (tmp, env, depth)); | |
c96d76b8 | 1524 | } |
9fbee57e DH |
1525 | else |
1526 | return form; | |
1527 | } | |
1528 | ||
1529 | SCM | |
21628685 | 1530 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1531 | { |
21628685 DH |
1532 | const SCM cdr_expr = SCM_CDR (expr); |
1533 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1534 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1535 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1536 | } |
1537 | ||
1538 | ||
3b88ed2a | 1539 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1540 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1541 | ||
1542 | SCM | |
21628685 | 1543 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1544 | { |
21628685 DH |
1545 | SCM quotee; |
1546 | ||
1547 | const SCM cdr_expr = SCM_CDR (expr); | |
1548 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1549 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1550 | quotee = SCM_CAR (cdr_expr); | |
5fb64383 | 1551 | if (is_self_quoting_p (quotee)) |
21628685 | 1552 | return quotee; |
21628685 DH |
1553 | SCM_SETCAR (expr, SCM_IM_QUOTE); |
1554 | return expr; | |
9fbee57e DH |
1555 | } |
1556 | ||
1557 | ||
1558 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1559 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1560 | static const char s_set_x[] = "set!"; |
1561 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1562 | ||
1563 | SCM | |
82b3e2c6 | 1564 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1565 | { |
82b3e2c6 | 1566 | SCM variable; |
36245b66 | 1567 | SCM new_variable; |
82b3e2c6 DH |
1568 | |
1569 | const SCM cdr_expr = SCM_CDR (expr); | |
1570 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1571 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1572 | variable = SCM_CAR (cdr_expr); | |
36245b66 DH |
1573 | |
1574 | /* Memoize the variable form. */ | |
1575 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
1576 | new_variable = lookup_symbol (variable, env); | |
1577 | ASSERT_SYNTAX (!SCM_MACROP (new_variable), s_macro_keyword, variable); | |
1578 | /* Leave the memoization of unbound symbols to lazy memoization: */ | |
1579 | if (SCM_UNBNDP (new_variable)) | |
1580 | new_variable = variable; | |
82b3e2c6 DH |
1581 | |
1582 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
36245b66 | 1583 | SCM_SETCAR (cdr_expr, new_variable); |
82b3e2c6 | 1584 | return expr; |
9fbee57e DH |
1585 | } |
1586 | ||
1587 | ||
1588 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1589 | ||
1590 | ||
3b88ed2a | 1591 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1592 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1593 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1594 | ||
1595 | SCM | |
82b3e2c6 | 1596 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1597 | { |
82b3e2c6 DH |
1598 | const SCM cdr_expr = SCM_CDR (expr); |
1599 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1600 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1601 | |
82b3e2c6 DH |
1602 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1603 | return expr; | |
1604 | } | |
2e171178 | 1605 | |
2e171178 | 1606 | |
3b88ed2a | 1607 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1608 | |
82b3e2c6 DH |
1609 | /* FIXME: The following explanation should go into the documentation: */ |
1610 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1611 | * the global variables named by `var's (symbols, not evaluated), creating | |
1612 | * them if they don't exist, executes body, and then restores the previous | |
1613 | * values of the `var's. Additionally, whenever control leaves body, the | |
1614 | * values of the `var's are saved and restored when control returns. It is an | |
1615 | * error when a symbol appears more than once among the `var's. All `init's | |
1616 | * are evaluated before any `var' is set. | |
1617 | * | |
1618 | * Think of this as `let' for dynamic scope. | |
1619 | */ | |
1620 | ||
1621 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
1622 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
1623 | * | |
1624 | * FIXME - also implement `@bind*'. | |
1625 | */ | |
73b64342 | 1626 | SCM |
82b3e2c6 | 1627 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 1628 | { |
82b3e2c6 DH |
1629 | SCM bindings; |
1630 | SCM rvariables; | |
1631 | SCM inits; | |
1632 | SCM variable_idx; | |
2e171178 | 1633 | |
82b3e2c6 | 1634 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 1635 | |
82b3e2c6 DH |
1636 | const SCM cdr_expr = SCM_CDR (expr); |
1637 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1638 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1639 | bindings = SCM_CAR (cdr_expr); | |
1640 | check_bindings (bindings, expr); | |
1641 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1642 | ||
1643 | for (variable_idx = rvariables; | |
1644 | !SCM_NULLP (variable_idx); | |
1645 | variable_idx = SCM_CDR (variable_idx)) | |
73b64342 | 1646 | { |
82b3e2c6 DH |
1647 | /* The first call to scm_sym2var will look beyond the current module, |
1648 | * while the second call wont. */ | |
1649 | const SCM variable = SCM_CAR (variable_idx); | |
1650 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
1651 | if (SCM_FALSEP (new_variable)) | |
1652 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); | |
1653 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 1654 | } |
82b3e2c6 DH |
1655 | |
1656 | SCM_SETCAR (expr, SCM_IM_BIND); | |
1657 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
1658 | return expr; | |
73b64342 | 1659 | } |
73b64342 | 1660 | |
b0c5d67b | 1661 | |
3b88ed2a | 1662 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
1663 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
1664 | ||
9fbee57e | 1665 | SCM |
da48db62 | 1666 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1667 | { |
da48db62 DH |
1668 | const SCM cdr_expr = SCM_CDR (expr); |
1669 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1670 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1671 | ||
1672 | SCM_SETCAR (expr, SCM_IM_CONT); | |
1673 | return expr; | |
b0c5d67b | 1674 | } |
b0c5d67b DH |
1675 | |
1676 | ||
3b88ed2a | 1677 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 1678 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
1679 | |
1680 | SCM | |
da48db62 | 1681 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1682 | { |
da48db62 DH |
1683 | const SCM cdr_expr = SCM_CDR (expr); |
1684 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1685 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1686 | ||
1687 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
1688 | return expr; | |
b0c5d67b | 1689 | } |
b0c5d67b DH |
1690 | |
1691 | ||
3b88ed2a | 1692 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 1693 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 1694 | |
9fbee57e DH |
1695 | /* Like promises, futures are implemented as closures with an empty |
1696 | * parameter list. Thus, (future <expression>) is transformed into | |
1697 | * (#@future '() <expression>), where the empty list represents the | |
1698 | * empty parameter list. This representation allows for easy creation | |
1699 | * of the closure during evaluation. */ | |
a513ead3 | 1700 | SCM |
8ae95199 | 1701 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 1702 | { |
8ae95199 DH |
1703 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1704 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
1705 | return new_expr; | |
a513ead3 MV |
1706 | } |
1707 | ||
9fbee57e | 1708 | |
3b88ed2a | 1709 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
1710 | SCM_SYMBOL (scm_sym_setter, "setter"); |
1711 | ||
1712 | SCM | |
7893dbbf | 1713 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 1714 | { |
7893dbbf | 1715 | SCM target, exp_target; |
da48db62 DH |
1716 | |
1717 | const SCM cdr_expr = SCM_CDR (expr); | |
1718 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1719 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1720 | ||
1721 | target = SCM_CAR (cdr_expr); | |
1722 | if (!SCM_CONSP (target)) | |
1723 | { | |
1724 | /* R5RS usage */ | |
1725 | return scm_m_set_x (expr, env); | |
1726 | } | |
9fbee57e | 1727 | else |
da48db62 DH |
1728 | { |
1729 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
1730 | /* Macroexpanding the target might return things of the form |
1731 | (begin <atom>). In that case, <atom> must be a symbol or a | |
1732 | variable and we memoize to (set! <atom> ...). | |
1733 | */ | |
1734 | exp_target = scm_macroexp (target, env); | |
1735 | if (SCM_EQ_P (SCM_CAR (exp_target), SCM_IM_BEGIN) | |
1736 | && !SCM_NULLP (SCM_CDR (exp_target)) | |
1737 | && SCM_NULLP (SCM_CDDR (exp_target))) | |
1738 | { | |
1739 | exp_target= SCM_CADR (exp_target); | |
6d1a2e9f MV |
1740 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (exp_target) |
1741 | || SCM_VARIABLEP (exp_target), | |
1742 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
1743 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
1744 | SCM_CDR (cdr_expr))); | |
1745 | } | |
1746 | else | |
1747 | { | |
1748 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
1749 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
1750 | setter_proc_tail); | |
da48db62 | 1751 | |
7893dbbf MV |
1752 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
1753 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
1754 | cddr_expr)); | |
da48db62 | 1755 | |
7893dbbf MV |
1756 | SCM_SETCAR (expr, setter_proc); |
1757 | SCM_SETCDR (expr, setter_args); | |
1758 | return expr; | |
1759 | } | |
da48db62 | 1760 | } |
9fbee57e DH |
1761 | } |
1762 | ||
1763 | ||
a4aa2134 DH |
1764 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
1765 | * soon as the module system allows us to more freely create bindings in | |
1766 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1767 | * moved here. */ | |
9fbee57e | 1768 | SCM |
9a848baf | 1769 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1770 | { |
9a848baf DH |
1771 | SCM slot_nr; |
1772 | ||
1773 | const SCM cdr_expr = SCM_CDR (expr); | |
1774 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1775 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1776 | slot_nr = SCM_CADR (cdr_expr); | |
1777 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
9fbee57e | 1778 | |
9a848baf DH |
1779 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
1780 | return expr; | |
1781 | } | |
9fbee57e | 1782 | |
9fbee57e | 1783 | |
a4aa2134 DH |
1784 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
1785 | * soon as the module system allows us to more freely create bindings in | |
1786 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1787 | * moved here. */ | |
9fbee57e | 1788 | SCM |
9a848baf | 1789 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1790 | { |
9a848baf DH |
1791 | SCM slot_nr; |
1792 | ||
1793 | const SCM cdr_expr = SCM_CDR (expr); | |
1794 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1795 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
1796 | slot_nr = SCM_CADR (cdr_expr); | |
1797 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
1798 | ||
1799 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
1800 | return expr; | |
9fbee57e | 1801 | } |
9fbee57e DH |
1802 | |
1803 | ||
1804 | #if SCM_ENABLE_ELISP | |
1805 | ||
70c1c108 DH |
1806 | static const char s_defun[] = "Symbol's function definition is void"; |
1807 | ||
3b88ed2a | 1808 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 1809 | |
70c1c108 DH |
1810 | /* nil-cond expressions have the form |
1811 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 1812 | SCM |
70c1c108 | 1813 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1814 | { |
70c1c108 DH |
1815 | const long length = scm_ilength (SCM_CDR (expr)); |
1816 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1817 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
1818 | ||
1819 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
1820 | return expr; | |
9fbee57e DH |
1821 | } |
1822 | ||
1823 | ||
3b88ed2a | 1824 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 1825 | |
70c1c108 DH |
1826 | /* The @fop-macro handles procedure and macro applications for elisp. The |
1827 | * input expression must have the form | |
1828 | * (@fop <var> (transformer-macro <expr> ...)) | |
1829 | * where <var> must be a symbol. The expression is transformed into the | |
1830 | * memoized form of either | |
1831 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
1832 | * if the value of var (across all aliasing) is not a macro, or | |
1833 | * (<un-aliased var> <expr> ...) | |
1834 | * if var is a macro. */ | |
9fbee57e | 1835 | SCM |
70c1c108 | 1836 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1837 | { |
70c1c108 DH |
1838 | SCM location; |
1839 | SCM symbol; | |
1840 | ||
1841 | const SCM cdr_expr = SCM_CDR (expr); | |
1842 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1843 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
1844 | ||
1845 | symbol = SCM_CAR (cdr_expr); | |
1846 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (symbol), s_bad_variable, symbol, expr); | |
1847 | ||
1848 | location = scm_symbol_fref (symbol); | |
1849 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
1850 | ||
1851 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
1852 | * look up such definitions, the chain of symbol definitions has to be | |
1853 | * followed up to the terminal symbol. */ | |
1854 | while (SCM_SYMBOLP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 1855 | { |
70c1c108 DH |
1856 | const SCM alias = SCM_VARIABLE_REF (location); |
1857 | location = scm_symbol_fref (alias); | |
1858 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 1859 | } |
70c1c108 DH |
1860 | |
1861 | /* Memoize the value location belonging to the terminal symbol. */ | |
1862 | SCM_SETCAR (cdr_expr, location); | |
1863 | ||
1864 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 1865 | { |
70c1c108 DH |
1866 | /* Since the location does not contain a macro, the form is a procedure |
1867 | * application. Replace `@fop' by `@apply' and transform the expression | |
1868 | * including the `transformer-macro'. */ | |
1869 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
1870 | return expr; | |
1871 | } | |
1872 | else | |
1873 | { | |
1874 | /* Since the location contains a macro, the arguments should not be | |
1875 | * transformed, so the `transformer-macro' is cut out. The resulting | |
1876 | * expression starts with the memoized variable, that is at the cdr of | |
1877 | * the input expression. */ | |
1878 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
1879 | return cdr_expr; | |
9fbee57e | 1880 | } |
9fbee57e DH |
1881 | } |
1882 | ||
1883 | #endif /* SCM_ENABLE_ELISP */ | |
1884 | ||
1885 | ||
434f2f7a | 1886 | #if (SCM_ENABLE_DEPRECATED == 1) |
f58c472a | 1887 | |
434f2f7a DH |
1888 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ |
1889 | SCM | |
1890 | scm_m_expand_body (SCM exprs, SCM env) | |
1891 | { | |
1892 | scm_c_issue_deprecation_warning | |
1893 | ("`scm_m_expand_body' is deprecated."); | |
1894 | m_expand_body (exprs, env); | |
1895 | return exprs; | |
1896 | } | |
f58c472a | 1897 | |
f58c472a DH |
1898 | |
1899 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
1900 | ||
1901 | SCM | |
70c1c108 | 1902 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 1903 | { |
70c1c108 DH |
1904 | SCM variable; |
1905 | SCM location; | |
1906 | ||
1907 | const SCM cdr_expr = SCM_CDR (expr); | |
1908 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
1909 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1910 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1911 | ||
1912 | variable = SCM_CAR (cdr_expr); | |
1913 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
1914 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); | |
1915 | ASSERT_SYNTAX_2 (!SCM_FALSEP (location) | |
1916 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), | |
1917 | "variable already unbound ", variable, expr); | |
1918 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 1919 | return SCM_UNSPECIFIED; |
f58c472a DH |
1920 | } |
1921 | ||
6f81708a | 1922 | |
26d5b9b4 MD |
1923 | SCM |
1924 | scm_macroexp (SCM x, SCM env) | |
1925 | { | |
86d31dfe | 1926 | SCM res, proc, orig_sym; |
26d5b9b4 MD |
1927 | |
1928 | /* Don't bother to produce error messages here. We get them when we | |
1929 | eventually execute the code for real. */ | |
1930 | ||
1931 | macro_tail: | |
86d31dfe MV |
1932 | orig_sym = SCM_CAR (x); |
1933 | if (!SCM_SYMBOLP (orig_sym)) | |
26d5b9b4 MD |
1934 | return x; |
1935 | ||
26d5b9b4 MD |
1936 | { |
1937 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
1938 | if (proc_ptr == NULL) | |
1939 | { | |
1940 | /* We have lost the race. */ | |
1941 | goto macro_tail; | |
1942 | } | |
1943 | proc = *proc_ptr; | |
1944 | } | |
26d5b9b4 MD |
1945 | |
1946 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
1947 | special forms and should not be evaluated here. */ | |
1948 | ||
3b88ed2a DH |
1949 | if (!SCM_MACROP (proc) |
1950 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
26d5b9b4 MD |
1951 | return x; |
1952 | ||
86d31dfe | 1953 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ |
fdc28395 | 1954 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); |
26d5b9b4 MD |
1955 | |
1956 | if (scm_ilength (res) <= 0) | |
8ea46249 | 1957 | res = scm_list_2 (SCM_IM_BEGIN, res); |
26d5b9b4 | 1958 | |
26d5b9b4 MD |
1959 | SCM_DEFER_INTS; |
1960 | SCM_SETCAR (x, SCM_CAR (res)); | |
1961 | SCM_SETCDR (x, SCM_CDR (res)); | |
1962 | SCM_ALLOW_INTS; | |
1963 | ||
1964 | goto macro_tail; | |
1965 | } | |
73b64342 | 1966 | |
6f81708a DH |
1967 | #endif |
1968 | ||
1969 | /*****************************************************************************/ | |
1970 | /*****************************************************************************/ | |
1971 | /* The definitions for unmemoization start here. */ | |
1972 | /*****************************************************************************/ | |
1973 | /*****************************************************************************/ | |
1974 | ||
a44a9715 DH |
1975 | #define SCM_BIT7(x) (127 & SCM_UNPACK (x)) |
1976 | ||
6f81708a | 1977 | SCM_SYMBOL (sym_three_question_marks, "???"); |
a44a9715 | 1978 | |
60a49842 | 1979 | |
6dbd0af5 MD |
1980 | /* scm_unmemocopy takes a memoized expression together with its |
1981 | * environment and rewrites it to its original form. Thus, it is the | |
1982 | * inversion of the rewrite rules above. The procedure is not | |
1983 | * optimized for speed. It's used in scm_iprin1 when printing the | |
220ff1eb MD |
1984 | * code of a closure, in scm_procedure_source, in display_frame when |
1985 | * generating the source for a stackframe in a backtrace, and in | |
1986 | * display_expression. | |
86d31dfe | 1987 | * |
c96d76b8 | 1988 | * Unmemoizing is not a reliable process. You cannot in general |
86d31dfe MV |
1989 | * expect to get the original source back. |
1990 | * | |
1991 | * However, GOOPS currently relies on this for method compilation. | |
1992 | * This ought to change. | |
26d5b9b4 MD |
1993 | */ |
1994 | ||
8ea46249 | 1995 | static SCM |
60a49842 | 1996 | build_binding_list (SCM rnames, SCM rinits) |
8ea46249 DH |
1997 | { |
1998 | SCM bindings = SCM_EOL; | |
60a49842 | 1999 | while (!SCM_NULLP (rnames)) |
8ea46249 | 2000 | { |
60a49842 | 2001 | SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); |
8ea46249 | 2002 | bindings = scm_cons (binding, bindings); |
60a49842 DH |
2003 | rnames = SCM_CDR (rnames); |
2004 | rinits = SCM_CDR (rinits); | |
8ea46249 DH |
2005 | } |
2006 | return bindings; | |
2007 | } | |
2008 | ||
60a49842 | 2009 | |
6f81708a DH |
2010 | static SCM |
2011 | unmemocar (SCM form, SCM env) | |
60a49842 DH |
2012 | { |
2013 | if (!SCM_CONSP (form)) | |
2014 | return form; | |
2015 | else | |
2016 | { | |
2017 | SCM c = SCM_CAR (form); | |
2018 | if (SCM_VARIABLEP (c)) | |
2019 | { | |
2020 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
2021 | if (SCM_FALSEP (sym)) | |
2022 | sym = sym_three_question_marks; | |
2023 | SCM_SETCAR (form, sym); | |
2024 | } | |
2025 | else if (SCM_ILOCP (c)) | |
2026 | { | |
2027 | unsigned long int ir; | |
2028 | ||
2029 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2030 | env = SCM_CDR (env); | |
2031 | env = SCM_CAAR (env); | |
2032 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2033 | env = SCM_CDR (env); | |
f62b9dff | 2034 | |
60a49842 DH |
2035 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2036 | } | |
2037 | return form; | |
2038 | } | |
2039 | } | |
2040 | ||
6f81708a | 2041 | |
6bff1368 DH |
2042 | SCM |
2043 | scm_unmemocopy (SCM x, SCM env) | |
6dbd0af5 MD |
2044 | { |
2045 | SCM ls, z; | |
6dbd0af5 | 2046 | SCM p; |
21628685 DH |
2047 | |
2048 | if (SCM_VECTORP (x)) | |
2049 | { | |
2050 | return scm_list_2 (scm_sym_quote, x); | |
2051 | } | |
2052 | else if (!SCM_CONSP (x)) | |
6dbd0af5 | 2053 | return x; |
21628685 | 2054 | |
6dbd0af5 | 2055 | p = scm_whash_lookup (scm_source_whash, x); |
0e7bb795 | 2056 | if (SCM_ISYMP (SCM_CAR (x))) |
6dbd0af5 | 2057 | { |
7e6e6b37 | 2058 | switch (ISYMNUM (SCM_CAR (x))) |
0e7bb795 | 2059 | { |
7e6e6b37 | 2060 | case (ISYMNUM (SCM_IM_AND)): |
0e7bb795 DH |
2061 | ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED); |
2062 | break; | |
7e6e6b37 | 2063 | case (ISYMNUM (SCM_IM_BEGIN)): |
0e7bb795 DH |
2064 | ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED); |
2065 | break; | |
7e6e6b37 | 2066 | case (ISYMNUM (SCM_IM_CASE)): |
0e7bb795 DH |
2067 | ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED); |
2068 | break; | |
7e6e6b37 | 2069 | case (ISYMNUM (SCM_IM_COND)): |
0e7bb795 DH |
2070 | ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED); |
2071 | break; | |
7e6e6b37 | 2072 | case (ISYMNUM (SCM_IM_DO)): |
0e7bb795 DH |
2073 | { |
2074 | /* format: (#@do (i1 ... ik) (nk ... n1) (test) (body) s1 ... sk), | |
2075 | * where ix is an initializer for a local variable, nx is the name | |
2076 | * of the local variable, test is the test clause of the do loop, | |
2077 | * body is the body of the do loop and sx are the step clauses for | |
2078 | * the local variables. */ | |
2079 | SCM names, inits, test, memoized_body, steps, bindings; | |
2080 | ||
2081 | x = SCM_CDR (x); | |
2082 | inits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); | |
2083 | x = SCM_CDR (x); | |
2084 | names = SCM_CAR (x); | |
2085 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); | |
2086 | x = SCM_CDR (x); | |
2087 | test = scm_unmemocopy (SCM_CAR (x), env); | |
2088 | x = SCM_CDR (x); | |
2089 | memoized_body = SCM_CAR (x); | |
2090 | x = SCM_CDR (x); | |
2091 | steps = scm_reverse (scm_unmemocopy (x, env)); | |
2092 | ||
2093 | /* build transformed binding list */ | |
2094 | bindings = SCM_EOL; | |
2095 | while (!SCM_NULLP (names)) | |
2096 | { | |
2097 | SCM name = SCM_CAR (names); | |
2098 | SCM init = SCM_CAR (inits); | |
2099 | SCM step = SCM_CAR (steps); | |
2100 | step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step); | |
2101 | ||
2102 | bindings = scm_cons (scm_cons2 (name, init, step), bindings); | |
2103 | ||
2104 | names = SCM_CDR (names); | |
2105 | inits = SCM_CDR (inits); | |
2106 | steps = SCM_CDR (steps); | |
2107 | } | |
2108 | z = scm_cons (test, SCM_UNSPECIFIED); | |
2109 | ls = scm_cons2 (scm_sym_do, bindings, z); | |
2110 | ||
2111 | x = scm_cons (SCM_BOOL_F, memoized_body); | |
2112 | break; | |
2113 | } | |
7e6e6b37 | 2114 | case (ISYMNUM (SCM_IM_IF)): |
0e7bb795 DH |
2115 | ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED); |
2116 | break; | |
7e6e6b37 | 2117 | case (ISYMNUM (SCM_IM_LET)): |
0e7bb795 DH |
2118 | { |
2119 | /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...), | |
2120 | * where nx is the name of a local variable, ix is an initializer | |
2121 | * for the local variable and by are the body clauses. */ | |
2122 | SCM rnames, rinits, bindings; | |
2123 | ||
2124 | x = SCM_CDR (x); | |
2125 | rnames = SCM_CAR (x); | |
2126 | x = SCM_CDR (x); | |
2127 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); | |
2128 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
2129 | ||
2130 | bindings = build_binding_list (rnames, rinits); | |
2131 | z = scm_cons (bindings, SCM_UNSPECIFIED); | |
05b15362 | 2132 | ls = scm_cons (scm_sym_let, z); |
0e7bb795 DH |
2133 | break; |
2134 | } | |
7e6e6b37 | 2135 | case (ISYMNUM (SCM_IM_LETREC)): |
0e7bb795 DH |
2136 | { |
2137 | /* format: (#@letrec (vn ... v2 v1) (i1 i2 ... in) b1 ...), | |
2138 | * where vx is the name of a local variable, ix is an initializer | |
2139 | * for the local variable and by are the body clauses. */ | |
2140 | SCM rnames, rinits, bindings; | |
2141 | ||
2142 | x = SCM_CDR (x); | |
2143 | rnames = SCM_CAR (x); | |
2144 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
2145 | x = SCM_CDR (x); | |
2146 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); | |
2147 | ||
2148 | bindings = build_binding_list (rnames, rinits); | |
2149 | z = scm_cons (bindings, SCM_UNSPECIFIED); | |
2150 | ls = scm_cons (scm_sym_letrec, z); | |
2151 | break; | |
2152 | } | |
7e6e6b37 | 2153 | case (ISYMNUM (SCM_IM_LETSTAR)): |
0e7bb795 DH |
2154 | { |
2155 | SCM b, y; | |
2156 | x = SCM_CDR (x); | |
2157 | b = SCM_CAR (x); | |
2158 | y = SCM_EOL; | |
2159 | if (SCM_NULLP (b)) | |
2160 | { | |
2161 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); | |
2162 | } | |
2163 | else | |
2164 | { | |
2165 | SCM copy = scm_unmemocopy (SCM_CADR (b), env); | |
2166 | SCM initializer = unmemocar (scm_list_1 (copy), env); | |
2167 | y = z = scm_acons (SCM_CAR (b), initializer, SCM_UNSPECIFIED); | |
2168 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); | |
2169 | b = SCM_CDDR (b); | |
2170 | if (SCM_NULLP (b)) | |
2171 | { | |
2172 | SCM_SETCDR (y, SCM_EOL); | |
2173 | z = scm_cons (y, SCM_UNSPECIFIED); | |
2174 | ls = scm_cons (scm_sym_let, z); | |
2175 | break; | |
2176 | } | |
2177 | do | |
2178 | { | |
2179 | copy = scm_unmemocopy (SCM_CADR (b), env); | |
2180 | initializer = unmemocar (scm_list_1 (copy), env); | |
2181 | SCM_SETCDR (z, scm_acons (SCM_CAR (b), | |
b1cb24ff | 2182 | initializer, |
0e7bb795 DH |
2183 | SCM_UNSPECIFIED)); |
2184 | z = SCM_CDR (z); | |
2185 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); | |
2186 | b = SCM_CDDR (b); | |
2187 | } | |
2188 | while (!SCM_NULLP (b)); | |
2189 | SCM_SETCDR (z, SCM_EOL); | |
2190 | } | |
2191 | z = scm_cons (y, SCM_UNSPECIFIED); | |
2192 | ls = scm_cons (scm_sym_letstar, z); | |
2193 | break; | |
2194 | } | |
7e6e6b37 | 2195 | case (ISYMNUM (SCM_IM_OR)): |
0e7bb795 DH |
2196 | ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED); |
2197 | break; | |
7e6e6b37 | 2198 | case (ISYMNUM (SCM_IM_LAMBDA)): |
0e7bb795 DH |
2199 | x = SCM_CDR (x); |
2200 | z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED); | |
2201 | ls = scm_cons (scm_sym_lambda, z); | |
2202 | env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env); | |
2203 | break; | |
7e6e6b37 | 2204 | case (ISYMNUM (SCM_IM_QUOTE)): |
0e7bb795 DH |
2205 | ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED); |
2206 | break; | |
7e6e6b37 | 2207 | case (ISYMNUM (SCM_IM_SET_X)): |
0e7bb795 DH |
2208 | ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED); |
2209 | break; | |
7e6e6b37 | 2210 | case (ISYMNUM (SCM_IM_APPLY)): |
2f0d1375 | 2211 | ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED); |
0e7bb795 | 2212 | break; |
7e6e6b37 | 2213 | case (ISYMNUM (SCM_IM_CONT)): |
2f0d1375 | 2214 | ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED); |
0e7bb795 | 2215 | break; |
7e6e6b37 | 2216 | case (ISYMNUM (SCM_IM_DELAY)): |
a570e93a MD |
2217 | ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED); |
2218 | x = SCM_CDR (x); | |
0e7bb795 | 2219 | break; |
7e6e6b37 | 2220 | case (ISYMNUM (SCM_IM_FUTURE)): |
ebf9b47c | 2221 | ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED); |
28d52ebb | 2222 | x = SCM_CDR (x); |
0e7bb795 | 2223 | break; |
7e6e6b37 | 2224 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 2225 | ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED); |
0e7bb795 | 2226 | break; |
7e6e6b37 | 2227 | case (ISYMNUM (SCM_IM_ELSE)): |
2a6f7afe | 2228 | ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED); |
0e7bb795 DH |
2229 | break; |
2230 | default: | |
2231 | ls = z = unmemocar (scm_cons (scm_unmemocopy (SCM_CAR (x), env), | |
2232 | SCM_UNSPECIFIED), | |
2233 | env); | |
2234 | } | |
2235 | } | |
2236 | else | |
2237 | { | |
6bff1368 | 2238 | ls = z = unmemocar (scm_cons (scm_unmemocopy (SCM_CAR (x), env), |
6dbd0af5 MD |
2239 | SCM_UNSPECIFIED), |
2240 | env); | |
2241 | } | |
0e7bb795 | 2242 | |
8c494e99 DH |
2243 | x = SCM_CDR (x); |
2244 | while (SCM_CONSP (x)) | |
a23afe53 | 2245 | { |
8c494e99 DH |
2246 | SCM form = SCM_CAR (x); |
2247 | if (!SCM_ISYMP (form)) | |
2248 | { | |
6bff1368 | 2249 | SCM copy = scm_cons (scm_unmemocopy (form, env), SCM_UNSPECIFIED); |
8c494e99 DH |
2250 | SCM_SETCDR (z, unmemocar (copy, env)); |
2251 | z = SCM_CDR (z); | |
2252 | } | |
609a8b86 DH |
2253 | else if (SCM_EQ_P (form, SCM_IM_ARROW)) |
2254 | { | |
2255 | SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED)); | |
2256 | z = SCM_CDR (z); | |
2257 | } | |
8c494e99 | 2258 | x = SCM_CDR (x); |
a23afe53 MD |
2259 | } |
2260 | SCM_SETCDR (z, x); | |
01f11e02 | 2261 | if (!SCM_FALSEP (p)) |
6dbd0af5 | 2262 | scm_whash_insert (scm_source_whash, ls, p); |
6dbd0af5 MD |
2263 | return ls; |
2264 | } | |
2265 | ||
1cc91f1b | 2266 | |
434f2f7a DH |
2267 | #if (SCM_ENABLE_DEPRECATED == 1) |
2268 | ||
2269 | SCM | |
2270 | scm_unmemocar (SCM form, SCM env) | |
2271 | { | |
2272 | return unmemocar (form, env); | |
2273 | } | |
2274 | ||
2275 | #endif | |
2276 | ||
6f81708a DH |
2277 | /*****************************************************************************/ |
2278 | /*****************************************************************************/ | |
2279 | /* The definitions for execution start here. */ | |
2280 | /*****************************************************************************/ | |
2281 | /*****************************************************************************/ | |
2282 | ||
2283 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2284 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2285 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2286 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
2287 | ||
2288 | /* A function object to implement "apply" for non-closure functions. */ | |
2289 | static SCM f_apply; | |
2290 | /* An endless list consisting of #<undefined> objects: */ | |
2291 | static SCM undefineds; | |
2292 | ||
2293 | ||
2294 | int | |
6e8d25a6 | 2295 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2296 | { |
6a0f6ff3 | 2297 | while (!SCM_NULLP (formals)) |
0f2d19dd | 2298 | { |
01f11e02 | 2299 | if (!SCM_CONSP (formals)) |
ff467021 | 2300 | return 0; |
6a0f6ff3 | 2301 | if (SCM_NULLP (args)) |
ff467021 | 2302 | return 1; |
0f2d19dd JB |
2303 | formals = SCM_CDR (formals); |
2304 | args = SCM_CDR (args); | |
2305 | } | |
01f11e02 | 2306 | return !SCM_NULLP (args) ? 1 : 0; |
0f2d19dd | 2307 | } |
a392ee15 | 2308 | |
0f2d19dd | 2309 | \f |
62360b89 | 2310 | |
434f2f7a DH |
2311 | /* The evaluator contains a plethora of EVAL symbols. This is an attempt at |
2312 | * explanation. | |
62360b89 | 2313 | * |
434f2f7a DH |
2314 | * The following macros should be used in code which is read twice (where the |
2315 | * choice of evaluator is hard soldered): | |
62360b89 | 2316 | * |
434f2f7a DH |
2317 | * CEVAL is the symbol used within one evaluator to call itself. |
2318 | * Originally, it is defined to ceval, but is redefined to deval during the | |
2319 | * second pass. | |
62360b89 DH |
2320 | * |
2321 | * SCM_EVALIM is used when it is known that the expression is an | |
2322 | * immediate. (This macro never calls an evaluator.) | |
434f2f7a DH |
2323 | * |
2324 | * EVAL evaluates an expression that is expected to have its symbols already | |
2325 | * memoized. Expressions that are not of the form '(<form> <form> ...)' are | |
2326 | * evaluated inline without calling an evaluator. | |
2327 | * | |
2328 | * EVALCAR evaluates the car of an expression 'X:(Y:<form> <form> ...)', | |
2329 | * potentially replacing a symbol at the position Y:<form> by its memoized | |
2330 | * variable. If Y:<form> is not of the form '(<form> <form> ...)', the | |
2331 | * evaluation is performed inline without calling an evaluator. | |
62360b89 DH |
2332 | * |
2333 | * The following macros should be used in code which is read once | |
2334 | * (where the choice of evaluator is dynamic): | |
2335 | * | |
434f2f7a DH |
2336 | * SCM_XEVAL corresponds to EVAL, but uses ceval *or* deval depending on the |
2337 | * debugging mode. | |
62360b89 | 2338 | * |
434f2f7a DH |
2339 | * SCM_XEVALCAR corresponds to EVALCAR, but uses ceval *or* deval depending |
2340 | * on the debugging mode. | |
62360b89 DH |
2341 | * |
2342 | * The main motivation for keeping this plethora is efficiency | |
2343 | * together with maintainability (=> locality of code). | |
2344 | */ | |
2345 | ||
434f2f7a DH |
2346 | static SCM ceval (SCM x, SCM env); |
2347 | static SCM deval (SCM x, SCM env); | |
2348 | #define CEVAL ceval | |
2349 | ||
62360b89 DH |
2350 | |
2351 | #define SCM_EVALIM2(x) \ | |
2352 | ((SCM_EQ_P ((x), SCM_EOL) \ | |
2353 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ | |
2354 | : 0), \ | |
2355 | (x)) | |
2356 | ||
2357 | #define SCM_EVALIM(x, env) (SCM_ILOCP (x) \ | |
434f2f7a | 2358 | ? *scm_ilookup ((x), (env)) \ |
62360b89 DH |
2359 | : SCM_EVALIM2(x)) |
2360 | ||
434f2f7a DH |
2361 | #define SCM_XEVAL(x, env) \ |
2362 | (SCM_IMP (x) \ | |
2363 | ? SCM_EVALIM2 (x) \ | |
2364 | : (SCM_VARIABLEP (x) \ | |
2365 | ? SCM_VARIABLE_REF (x) \ | |
2366 | : (SCM_CONSP (x) \ | |
2367 | ? (scm_debug_mode_p \ | |
2368 | ? deval ((x), (env)) \ | |
2369 | : ceval ((x), (env))) \ | |
2370 | : (x)))) | |
2371 | ||
2372 | #define SCM_XEVALCAR(x, env) \ | |
2373 | (SCM_IMP (SCM_CAR (x)) \ | |
2374 | ? SCM_EVALIM (SCM_CAR (x), (env)) \ | |
2375 | : (SCM_VARIABLEP (SCM_CAR (x)) \ | |
2376 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
2377 | : (SCM_CONSP (SCM_CAR (x)) \ | |
2378 | ? (scm_debug_mode_p \ | |
2379 | ? deval (SCM_CAR (x), (env)) \ | |
2380 | : ceval (SCM_CAR (x), (env))) \ | |
2381 | : (!SCM_SYMBOLP (SCM_CAR (x)) \ | |
2382 | ? SCM_CAR (x) \ | |
2383 | : *scm_lookupcar ((x), (env), 1))))) | |
2384 | ||
2385 | #define EVAL(x, env) \ | |
2386 | (SCM_IMP (x) \ | |
2387 | ? SCM_EVALIM ((x), (env)) \ | |
2388 | : (SCM_VARIABLEP (x) \ | |
2389 | ? SCM_VARIABLE_REF (x) \ | |
2390 | : (SCM_CONSP (x) \ | |
2391 | ? CEVAL ((x), (env)) \ | |
2392 | : (x)))) | |
2393 | ||
2394 | #define EVALCAR(x, env) \ | |
2395 | (SCM_IMP (SCM_CAR (x)) \ | |
2396 | ? SCM_EVALIM (SCM_CAR (x), (env)) \ | |
2397 | : (SCM_VARIABLEP (SCM_CAR (x)) \ | |
2398 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
2399 | : (SCM_CONSP (SCM_CAR (x)) \ | |
2400 | ? CEVAL (SCM_CAR (x), (env)) \ | |
2401 | : (!SCM_SYMBOLP (SCM_CAR (x)) \ | |
2402 | ? SCM_CAR (x) \ | |
2403 | : *scm_lookupcar ((x), (env), 1))))) | |
62360b89 DH |
2404 | |
2405 | SCM_REC_MUTEX (source_mutex); | |
2406 | ||
2407 | ||
e5156567 DH |
2408 | /* Lookup a given local variable in an environment. The local variable is |
2409 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
2410 | * indicates the relative number of the environment frame (counting upwards | |
2411 | * from the innermost environment frame), binding indicates the number of the | |
2412 | * binding within the frame, and last? (which is extracted from the iloc using | |
2413 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
2414 | * very end of the improper list of bindings. */ | |
2415 | SCM * | |
2416 | scm_ilookup (SCM iloc, SCM env) | |
2417 | { | |
2418 | unsigned int frame_nr = SCM_IFRAME (iloc); | |
2419 | unsigned int binding_nr = SCM_IDIST (iloc); | |
2420 | SCM frames = env; | |
2421 | SCM bindings; | |
2422 | ||
2423 | for (; 0 != frame_nr; --frame_nr) | |
2424 | frames = SCM_CDR (frames); | |
2425 | ||
2426 | bindings = SCM_CAR (frames); | |
2427 | for (; 0 != binding_nr; --binding_nr) | |
2428 | bindings = SCM_CDR (bindings); | |
2429 | ||
2430 | if (SCM_ICDRP (iloc)) | |
2431 | return SCM_CDRLOC (bindings); | |
2432 | return SCM_CARLOC (SCM_CDR (bindings)); | |
2433 | } | |
2434 | ||
2435 | ||
2436 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
2437 | ||
2438 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
2439 | static void | |
2440 | error_unbound_variable (SCM symbol) | |
2441 | { | |
2442 | scm_error (scm_unbound_variable_key, NULL, | |
2443 | "Unbound variable: ~S", | |
2444 | scm_list_1 (symbol), SCM_BOOL_F); | |
2445 | } | |
2446 | ||
2447 | ||
2448 | /* The Lookup Car Race | |
2449 | - by Eva Luator | |
2450 | ||
2451 | Memoization of variables and special forms is done while executing | |
2452 | the code for the first time. As long as there is only one thread | |
2453 | everything is fine, but as soon as two threads execute the same | |
2454 | code concurrently `for the first time' they can come into conflict. | |
2455 | ||
2456 | This memoization includes rewriting variable references into more | |
2457 | efficient forms and expanding macros. Furthermore, macro expansion | |
2458 | includes `compiling' special forms like `let', `cond', etc. into | |
2459 | tree-code instructions. | |
2460 | ||
2461 | There shouldn't normally be a problem with memoizing local and | |
2462 | global variable references (into ilocs and variables), because all | |
2463 | threads will mutate the code in *exactly* the same way and (if I | |
2464 | read the C code correctly) it is not possible to observe a half-way | |
2465 | mutated cons cell. The lookup procedure can handle this | |
2466 | transparently without any critical sections. | |
2467 | ||
2468 | It is different with macro expansion, because macro expansion | |
2469 | happens outside of the lookup procedure and can't be | |
2470 | undone. Therefore the lookup procedure can't cope with it. It has | |
2471 | to indicate failure when it detects a lost race and hope that the | |
2472 | caller can handle it. Luckily, it turns out that this is the case. | |
2473 | ||
2474 | An example to illustrate this: Suppose that the following form will | |
2475 | be memoized concurrently by two threads | |
2476 | ||
2477 | (let ((x 12)) x) | |
2478 | ||
2479 | Let's first examine the lookup of X in the body. The first thread | |
2480 | decides that it has to find the symbol "x" in the environment and | |
2481 | starts to scan it. Then the other thread takes over and actually | |
2482 | overtakes the first. It looks up "x" and substitutes an | |
2483 | appropriate iloc for it. Now the first thread continues and | |
2484 | completes its lookup. It comes to exactly the same conclusions as | |
2485 | the second one and could - without much ado - just overwrite the | |
2486 | iloc with the same iloc. | |
2487 | ||
2488 | But let's see what will happen when the race occurs while looking | |
2489 | up the symbol "let" at the start of the form. It could happen that | |
2490 | the second thread interrupts the lookup of the first thread and not | |
2491 | only substitutes a variable for it but goes right ahead and | |
2492 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
2493 | the first thread completes its lookup, it would replace the #@let* | |
2494 | with a variable containing the "let" binding, effectively reverting | |
2495 | the form to (let (x 12) x). This is wrong. It has to detect that | |
2496 | it has lost the race and the evaluator has to reconsider the | |
2497 | changed form completely. | |
2498 | ||
2499 | This race condition could be resolved with some kind of traffic | |
2500 | light (like mutexes) around scm_lookupcar, but I think that it is | |
2501 | best to avoid them in this case. They would serialize memoization | |
2502 | completely and because lookup involves calling arbitrary Scheme | |
2503 | code (via the lookup-thunk), threads could be blocked for an | |
2504 | arbitrary amount of time or even deadlock. But with the current | |
2505 | solution a lot of unnecessary work is potentially done. */ | |
2506 | ||
2507 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to | |
2508 | return NULL to indicate a failed lookup due to some race conditions | |
2509 | between threads. This only happens when VLOC is the first cell of | |
2510 | a special form that will eventually be memoized (like `let', etc.) | |
2511 | In that case the whole lookup is bogus and the caller has to | |
2512 | reconsider the complete special form. | |
2513 | ||
2514 | SCM_LOOKUPCAR is still there, of course. It just calls | |
2515 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR | |
2516 | should only be called when it is known that VLOC is not the first | |
2517 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
2518 | for NULL. I think I've found the only places where this | |
2519 | applies. */ | |
2520 | ||
2521 | static SCM * | |
2522 | scm_lookupcar1 (SCM vloc, SCM genv, int check) | |
2523 | { | |
2524 | SCM env = genv; | |
2525 | register SCM *al, fl, var = SCM_CAR (vloc); | |
2526 | register SCM iloc = SCM_ILOC00; | |
2527 | for (; SCM_NIMP (env); env = SCM_CDR (env)) | |
2528 | { | |
2529 | if (!SCM_CONSP (SCM_CAR (env))) | |
2530 | break; | |
2531 | al = SCM_CARLOC (env); | |
2532 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) | |
2533 | { | |
2534 | if (!SCM_CONSP (fl)) | |
2535 | { | |
2536 | if (SCM_EQ_P (fl, var)) | |
2537 | { | |
2538 | if (! SCM_EQ_P (SCM_CAR (vloc), var)) | |
2539 | goto race; | |
2540 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); | |
2541 | return SCM_CDRLOC (*al); | |
2542 | } | |
2543 | else | |
2544 | break; | |
2545 | } | |
2546 | al = SCM_CDRLOC (*al); | |
2547 | if (SCM_EQ_P (SCM_CAR (fl), var)) | |
2548 | { | |
2549 | if (SCM_UNBNDP (SCM_CAR (*al))) | |
2550 | { | |
2551 | env = SCM_EOL; | |
2552 | goto errout; | |
2553 | } | |
2554 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) | |
2555 | goto race; | |
2556 | SCM_SETCAR (vloc, iloc); | |
2557 | return SCM_CARLOC (*al); | |
2558 | } | |
2559 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); | |
2560 | } | |
2561 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); | |
2562 | } | |
2563 | { | |
2564 | SCM top_thunk, real_var; | |
2565 | if (SCM_NIMP (env)) | |
2566 | { | |
2567 | top_thunk = SCM_CAR (env); /* env now refers to a | |
2568 | top level env thunk */ | |
2569 | env = SCM_CDR (env); | |
2570 | } | |
2571 | else | |
2572 | top_thunk = SCM_BOOL_F; | |
2573 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); | |
2574 | if (SCM_FALSEP (real_var)) | |
2575 | goto errout; | |
2576 | ||
2577 | if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) | |
2578 | { | |
2579 | errout: | |
2580 | if (check) | |
2581 | { | |
2582 | if (SCM_NULLP (env)) | |
2583 | error_unbound_variable (var); | |
2584 | else | |
2585 | scm_misc_error (NULL, "Damaged environment: ~S", | |
2586 | scm_list_1 (var)); | |
2587 | } | |
2588 | else | |
2589 | { | |
2590 | /* A variable could not be found, but we shall | |
2591 | not throw an error. */ | |
2592 | static SCM undef_object = SCM_UNDEFINED; | |
2593 | return &undef_object; | |
2594 | } | |
2595 | } | |
2596 | ||
2597 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) | |
2598 | { | |
2599 | /* Some other thread has changed the very cell we are working | |
2600 | on. In effect, it must have done our job or messed it up | |
2601 | completely. */ | |
2602 | race: | |
2603 | var = SCM_CAR (vloc); | |
2604 | if (SCM_VARIABLEP (var)) | |
2605 | return SCM_VARIABLE_LOC (var); | |
2606 | if (SCM_ILOCP (var)) | |
2607 | return scm_ilookup (var, genv); | |
2608 | /* We can't cope with anything else than variables and ilocs. When | |
2609 | a special form has been memoized (i.e. `let' into `#@let') we | |
2610 | return NULL and expect the calling function to do the right | |
2611 | thing. For the evaluator, this means going back and redoing | |
2612 | the dispatch on the car of the form. */ | |
2613 | return NULL; | |
2614 | } | |
2615 | ||
2616 | SCM_SETCAR (vloc, real_var); | |
2617 | return SCM_VARIABLE_LOC (real_var); | |
2618 | } | |
2619 | } | |
2620 | ||
2621 | SCM * | |
2622 | scm_lookupcar (SCM vloc, SCM genv, int check) | |
2623 | { | |
2624 | SCM *loc = scm_lookupcar1 (vloc, genv, check); | |
2625 | if (loc == NULL) | |
2626 | abort (); | |
2627 | return loc; | |
2628 | } | |
2629 | ||
2630 | ||
36245b66 DH |
2631 | /* During execution, look up a symbol in the top level of the given local |
2632 | * environment and return the corresponding variable object. If no binding | |
2633 | * for the symbol can be found, an 'Unbound variable' error is signalled. */ | |
2634 | static SCM | |
2635 | lazy_memoize_variable (const SCM symbol, const SCM environment) | |
2636 | { | |
2637 | const SCM top_level = scm_env_top_level (environment); | |
2638 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
2639 | ||
2640 | if (SCM_FALSEP (variable)) | |
2641 | error_unbound_variable (symbol); | |
2642 | else | |
2643 | return variable; | |
2644 | } | |
2645 | ||
2646 | ||
62360b89 DH |
2647 | SCM |
2648 | scm_eval_car (SCM pair, SCM env) | |
2649 | { | |
2650 | return SCM_XEVALCAR (pair, env); | |
2651 | } | |
2652 | ||
2653 | ||
6dbd0af5 | 2654 | SCM |
6e8d25a6 | 2655 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2656 | { |
680ed4a8 | 2657 | SCM results = SCM_EOL, *lloc = &results, res; |
904a077d | 2658 | while (SCM_CONSP (l)) |
6dbd0af5 | 2659 | { |
680ed4a8 | 2660 | res = EVALCAR (l, env); |
904a077d | 2661 | |
8ea46249 | 2662 | *lloc = scm_list_1 (res); |
a23afe53 | 2663 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2664 | l = SCM_CDR (l); |
2665 | } | |
22a52da1 | 2666 | if (!SCM_NULLP (l)) |
904a077d | 2667 | scm_wrong_num_args (proc); |
680ed4a8 | 2668 | return results; |
6dbd0af5 | 2669 | } |
c4ac4d88 | 2670 | |
d0b07b5d | 2671 | |
9de33deb MD |
2672 | SCM |
2673 | scm_eval_body (SCM code, SCM env) | |
2674 | { | |
2675 | SCM next; | |
434f2f7a | 2676 | |
9de33deb | 2677 | again: |
01f11e02 DH |
2678 | next = SCM_CDR (code); |
2679 | while (!SCM_NULLP (next)) | |
9de33deb MD |
2680 | { |
2681 | if (SCM_IMP (SCM_CAR (code))) | |
2682 | { | |
2683 | if (SCM_ISYMP (SCM_CAR (code))) | |
2684 | { | |
28d52ebb | 2685 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2686 | /* check for race condition */ |
2687 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2688 | m_expand_body (code, env); |
28d52ebb | 2689 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2690 | goto again; |
2691 | } | |
2692 | } | |
2693 | else | |
2694 | SCM_XEVAL (SCM_CAR (code), env); | |
2695 | code = next; | |
01f11e02 | 2696 | next = SCM_CDR (code); |
9de33deb MD |
2697 | } |
2698 | return SCM_XEVALCAR (code, env); | |
2699 | } | |
2700 | ||
0f2d19dd JB |
2701 | #endif /* !DEVAL */ |
2702 | ||
6dbd0af5 MD |
2703 | |
2704 | /* SECTION: This code is specific for the debugging support. One | |
2705 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2706 | * defined. | |
2707 | */ | |
2708 | ||
2709 | #ifndef DEVAL | |
2710 | ||
2711 | #define SCM_APPLY scm_apply | |
2712 | #define PREP_APPLY(proc, args) | |
2713 | #define ENTER_APPLY | |
ddea3325 | 2714 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2715 | #ifdef STACK_CHECKING |
2716 | #ifndef NO_CEVAL_STACK_CHECKING | |
2717 | #define EVAL_STACK_CHECKING | |
2718 | #endif | |
6dbd0af5 MD |
2719 | #endif |
2720 | ||
2721 | #else /* !DEVAL */ | |
2722 | ||
434f2f7a DH |
2723 | #undef CEVAL |
2724 | #define CEVAL deval /* Substitute all uses of ceval */ | |
2725 | ||
0f2d19dd JB |
2726 | #undef SCM_APPLY |
2727 | #define SCM_APPLY scm_dapply | |
434f2f7a | 2728 | |
6dbd0af5 MD |
2729 | #undef PREP_APPLY |
2730 | #define PREP_APPLY(p, l) \ | |
2731 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
434f2f7a | 2732 | |
6dbd0af5 MD |
2733 | #undef ENTER_APPLY |
2734 | #define ENTER_APPLY \ | |
d3a6bc94 | 2735 | do { \ |
b7ff98dd | 2736 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2737 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2738 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2739 | {\ |
156dcb09 | 2740 | SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2741 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2742 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2743 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2744 | {\ |
c0ab1b8d | 2745 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 2746 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 2747 | }\ |
6dbd0af5 MD |
2748 | else\ |
2749 | {\ | |
5f144b10 GH |
2750 | int first;\ |
2751 | tmp = scm_make_continuation (&first);\ | |
2752 | if (first)\ | |
d95c0b76 | 2753 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 2754 | }\ |
d95c0b76 | 2755 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 2756 | }\ |
d3a6bc94 | 2757 | } while (0) |
434f2f7a | 2758 | |
0f2d19dd | 2759 | #undef RETURN |
ddea3325 | 2760 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
434f2f7a | 2761 | |
b7ff98dd MD |
2762 | #ifdef STACK_CHECKING |
2763 | #ifndef EVAL_STACK_CHECKING | |
2764 | #define EVAL_STACK_CHECKING | |
2765 | #endif | |
6dbd0af5 MD |
2766 | #endif |
2767 | ||
0f2d19dd | 2768 | |
434f2f7a DH |
2769 | /* scm_last_debug_frame contains a pointer to the last debugging information |
2770 | * stack frame. It is accessed very often from the debugging evaluator, so it | |
2771 | * should probably not be indirectly addressed. Better to save and restore it | |
2772 | * from the current root at any stack swaps. | |
6dbd0af5 MD |
2773 | */ |
2774 | ||
6dbd0af5 MD |
2775 | /* scm_debug_eframe_size is the number of slots available for pseudo |
2776 | * stack frames at each real stack frame. | |
2777 | */ | |
2778 | ||
c014a02e | 2779 | long scm_debug_eframe_size; |
6dbd0af5 | 2780 | |
434f2f7a DH |
2781 | int scm_debug_mode_p; |
2782 | int scm_check_entry_p; | |
2783 | int scm_check_apply_p; | |
2784 | int scm_check_exit_p; | |
6dbd0af5 | 2785 | |
c014a02e | 2786 | long scm_eval_stack; |
a74145b8 | 2787 | |
92c2555f | 2788 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 2789 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
2790 | }; |
2791 | ||
92c2555f | 2792 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
2793 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
2794 | "*Flyweight representation of the stack at traps." }, | |
2795 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
2796 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
2797 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
2798 | "Record procedure names at definition." }, | |
2799 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
2800 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 2801 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
2802 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
2803 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 2804 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
2805 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
2806 | "Maximal number of stored backtrace frames." }, | |
2807 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
2808 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
2809 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 2810 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 2811 | { 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 |
2812 | }; |
2813 | ||
92c2555f | 2814 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 2815 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
2816 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
2817 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
2818 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
2819 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
2820 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
2821 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
2822 | }; |
2823 | ||
a1ec6916 | 2824 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 2825 | (SCM setting), |
b3f26b14 MG |
2826 | "Option interface for the evaluation options. Instead of using\n" |
2827 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 2828 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 2829 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
2830 | { |
2831 | SCM ans; | |
2832 | SCM_DEFER_INTS; | |
2833 | ans = scm_options (setting, | |
2834 | scm_eval_opts, | |
2835 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 2836 | FUNC_NAME); |
a74145b8 | 2837 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
2838 | SCM_ALLOW_INTS; |
2839 | return ans; | |
2840 | } | |
1bbd0b84 | 2841 | #undef FUNC_NAME |
33b97402 | 2842 | |
d0b07b5d | 2843 | |
a1ec6916 | 2844 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 2845 | (SCM setting), |
b3f26b14 | 2846 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 2847 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
2848 | { |
2849 | SCM ans; | |
2850 | SCM_DEFER_INTS; | |
2851 | ans = scm_options (setting, | |
2852 | scm_evaluator_trap_table, | |
2853 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 2854 | FUNC_NAME); |
33b97402 | 2855 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 2856 | SCM_ALLOW_INTS; |
33b97402 MD |
2857 | return ans; |
2858 | } | |
1bbd0b84 | 2859 | #undef FUNC_NAME |
33b97402 | 2860 | |
d0b07b5d | 2861 | |
24933780 | 2862 | static SCM |
a392ee15 | 2863 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 2864 | { |
b1cb24ff | 2865 | SCM *results = lloc; |
904a077d | 2866 | while (SCM_CONSP (l)) |
0f2d19dd | 2867 | { |
b1cb24ff | 2868 | const SCM res = EVALCAR (l, env); |
904a077d | 2869 | |
8ea46249 | 2870 | *lloc = scm_list_1 (res); |
a23afe53 | 2871 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
2872 | l = SCM_CDR (l); |
2873 | } | |
22a52da1 | 2874 | if (!SCM_NULLP (l)) |
904a077d | 2875 | scm_wrong_num_args (proc); |
680ed4a8 | 2876 | return *results; |
0f2d19dd JB |
2877 | } |
2878 | ||
6dbd0af5 MD |
2879 | #endif /* !DEVAL */ |
2880 | ||
2881 | ||
a392ee15 | 2882 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
2883 | */ |
2884 | ||
a392ee15 | 2885 | |
d9d39d76 | 2886 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 2887 | * current module. */ |
d9d39d76 MV |
2888 | #define UPDATE_TOPLEVEL_ENV(env) \ |
2889 | do { \ | |
2890 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 2891 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
2892 | env = scm_top_level_env (p); \ |
2893 | } while (0) | |
2894 | ||
6dbd0af5 | 2895 | |
6f81708a DH |
2896 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
2897 | ASSERT_SYNTAX (!SCM_EQ_P ((x), SCM_EOL), s_empty_combination, x) | |
2898 | ||
2899 | ||
a392ee15 DH |
2900 | /* This is the evaluator. Like any real monster, it has three heads: |
2901 | * | |
434f2f7a DH |
2902 | * ceval is the non-debugging evaluator, deval is the debugging version. Both |
2903 | * are implemented using a common code base, using the following mechanism: | |
2904 | * CEVAL is a macro, which is either defined to ceval or deval. Thus, there | |
2905 | * is no function CEVAL, but the code for CEVAL actually compiles to either | |
2906 | * ceval or deval. When CEVAL is defined to ceval, it is known that the macro | |
2907 | * DEVAL is not defined. When CEVAL is defined to deval, then the macro DEVAL | |
2908 | * is known to be defined. Thus, in CEVAL parts for the debugging evaluator | |
a392ee15 DH |
2909 | * are enclosed within #ifdef DEVAL ... #endif. |
2910 | * | |
434f2f7a DH |
2911 | * All three (ceval, deval and their common implementation CEVAL) take two |
2912 | * input parameters, x and env: x is a single expression to be evalutated. | |
2913 | * env is the environment in which bindings are searched. | |
a392ee15 | 2914 | * |
434f2f7a DH |
2915 | * x is known to be a pair. Since x is a single expression, it is necessarily |
2916 | * in a tail position. If x is just a call to another function like in the | |
2917 | * expression (foo exp1 exp2 ...), the realization of that call therefore | |
2918 | * _must_not_ increase stack usage (the evaluation of exp1, exp2 etc., | |
2919 | * however, may do so). This is realized by making extensive use of 'goto' | |
2920 | * statements within the evaluator: The gotos replace recursive calls to | |
2921 | * CEVAL, thus re-using the same stack frame that CEVAL was already using. | |
2922 | * If, however, x represents some form that requires to evaluate a sequence of | |
2923 | * expressions like (begin exp1 exp2 ...), then recursive calls to CEVAL are | |
2924 | * performed for all but the last expression of that sequence. */ | |
6dbd0af5 | 2925 | |
434f2f7a DH |
2926 | static SCM |
2927 | CEVAL (SCM x, SCM env) | |
0f2d19dd | 2928 | { |
42030fb2 | 2929 | SCM proc, arg1; |
6dbd0af5 | 2930 | #ifdef DEVAL |
92c2555f MV |
2931 | scm_t_debug_frame debug; |
2932 | scm_t_debug_info *debug_info_end; | |
1646d37b | 2933 | debug.prev = scm_last_debug_frame; |
020c890c | 2934 | debug.status = 0; |
04b6c081 | 2935 | /* |
92c2555f | 2936 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
2937 | * user has specified with (debug-set! frames <n>). |
2938 | * | |
2939 | * Even frames are eval frames, odd frames are apply frames. | |
2940 | */ | |
92c2555f | 2941 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 2942 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
2943 | debug.info = debug.vect; |
2944 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
2945 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 2946 | #endif |
b7ff98dd | 2947 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 2948 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 2949 | { |
b7ff98dd | 2950 | #ifdef DEVAL |
6dbd0af5 MD |
2951 | debug.info->e.exp = x; |
2952 | debug.info->e.env = env; | |
b7ff98dd | 2953 | #endif |
6dbd0af5 MD |
2954 | scm_report_stack_overflow (); |
2955 | } | |
2956 | #endif | |
6a0f6ff3 | 2957 | |
6dbd0af5 MD |
2958 | #ifdef DEVAL |
2959 | goto start; | |
2960 | #endif | |
6a0f6ff3 | 2961 | |
6dbd0af5 MD |
2962 | loop: |
2963 | #ifdef DEVAL | |
b7ff98dd MD |
2964 | SCM_CLEAR_ARGSREADY (debug); |
2965 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 2966 | --debug.info; |
04b6c081 MD |
2967 | /* |
2968 | * In theory, this should be the only place where it is necessary to | |
2969 | * check for space in debug.vect since both eval frames and | |
2970 | * available space are even. | |
2971 | * | |
2972 | * For this to be the case, however, it is necessary that primitive | |
2973 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 2974 | * label call PREP_APPLY. |
04b6c081 | 2975 | */ |
c0ab1b8d | 2976 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 2977 | { |
b7ff98dd | 2978 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
2979 | debug.info -= 2; |
2980 | } | |
6a0f6ff3 | 2981 | |
6dbd0af5 MD |
2982 | start: |
2983 | debug.info->e.exp = x; | |
2984 | debug.info->e.env = env; | |
5132eef0 DH |
2985 | if (scm_check_entry_p && SCM_TRAPS_P) |
2986 | { | |
bc76d628 DH |
2987 | if (SCM_ENTER_FRAME_P |
2988 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 2989 | { |
bc76d628 DH |
2990 | SCM stackrep; |
2991 | SCM tail = SCM_BOOL (SCM_TAILRECP (debug)); | |
5132eef0 DH |
2992 | SCM_SET_TAILREC (debug); |
2993 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 2994 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
2995 | else |
2996 | { | |
2997 | int first; | |
2998 | SCM val = scm_make_continuation (&first); | |
2999 | ||
3000 | if (first) | |
bc76d628 | 3001 | stackrep = val; |
5132eef0 DH |
3002 | else |
3003 | { | |
3004 | x = val; | |
3005 | if (SCM_IMP (x)) | |
3006 | RETURN (x); | |
3007 | else | |
3008 | /* This gives the possibility for the debugger to | |
3009 | modify the source expression before evaluation. */ | |
3010 | goto dispatch; | |
3011 | } | |
3012 | } | |
3013 | SCM_TRAPS_P = 0; | |
3014 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
3015 | scm_sym_enter_frame, | |
bc76d628 | 3016 | stackrep, |
5132eef0 DH |
3017 | tail, |
3018 | scm_unmemocopy (x, env)); | |
3019 | SCM_TRAPS_P = 1; | |
3020 | } | |
3021 | } | |
6dbd0af5 | 3022 | #endif |
f8769b1d | 3023 | dispatch: |
9cb5124f | 3024 | SCM_TICK; |
dec40cd2 | 3025 | if (SCM_ISYMP (SCM_CAR (x))) |
0f2d19dd | 3026 | { |
7e6e6b37 | 3027 | switch (ISYMNUM (SCM_CAR (x))) |
dec40cd2 | 3028 | { |
7e6e6b37 | 3029 | case (ISYMNUM (SCM_IM_AND)): |
dec40cd2 DH |
3030 | x = SCM_CDR (x); |
3031 | while (!SCM_NULLP (SCM_CDR (x))) | |
3032 | { | |
3033 | SCM test_result = EVALCAR (x, env); | |
3034 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
3035 | RETURN (SCM_BOOL_F); | |
3036 | else | |
3037 | x = SCM_CDR (x); | |
3038 | } | |
3039 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3040 | goto carloop; | |
0f2d19dd | 3041 | |
7e6e6b37 | 3042 | case (ISYMNUM (SCM_IM_BEGIN)): |
dec40cd2 DH |
3043 | x = SCM_CDR (x); |
3044 | if (SCM_NULLP (x)) | |
3045 | RETURN (SCM_UNSPECIFIED); | |
b8113bc8 | 3046 | |
dec40cd2 | 3047 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd | 3048 | |
dec40cd2 DH |
3049 | begin: |
3050 | /* If we are on toplevel with a lookup closure, we need to sync | |
3051 | with the current module. */ | |
3052 | if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env))) | |
3053 | { | |
3054 | UPDATE_TOPLEVEL_ENV (env); | |
3055 | while (!SCM_NULLP (SCM_CDR (x))) | |
3056 | { | |
3057 | EVALCAR (x, env); | |
3058 | UPDATE_TOPLEVEL_ENV (env); | |
3059 | x = SCM_CDR (x); | |
3060 | } | |
3061 | goto carloop; | |
3062 | } | |
3063 | else | |
3064 | goto nontoplevel_begin; | |
5280aaca | 3065 | |
dec40cd2 DH |
3066 | nontoplevel_begin: |
3067 | while (!SCM_NULLP (SCM_CDR (x))) | |
3068 | { | |
b1cb24ff | 3069 | const SCM form = SCM_CAR (x); |
dec40cd2 DH |
3070 | if (SCM_IMP (form)) |
3071 | { | |
3072 | if (SCM_ISYMP (form)) | |
3073 | { | |
3074 | scm_rec_mutex_lock (&source_mutex); | |
3075 | /* check for race condition */ | |
3076 | if (SCM_ISYMP (SCM_CAR (x))) | |
3077 | m_expand_body (x, env); | |
3078 | scm_rec_mutex_unlock (&source_mutex); | |
3079 | goto nontoplevel_begin; | |
3080 | } | |
3081 | else | |
3082 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); | |
3083 | } | |
3084 | else | |
b1cb24ff | 3085 | (void) EVAL (form, env); |
dec40cd2 DH |
3086 | x = SCM_CDR (x); |
3087 | } | |
b1cb24ff | 3088 | |
dec40cd2 DH |
3089 | carloop: |
3090 | { | |
3091 | /* scm_eval last form in list */ | |
b1cb24ff | 3092 | const SCM last_form = SCM_CAR (x); |
0f2d19dd | 3093 | |
dec40cd2 DH |
3094 | if (SCM_CONSP (last_form)) |
3095 | { | |
3096 | /* This is by far the most frequent case. */ | |
3097 | x = last_form; | |
3098 | goto loop; /* tail recurse */ | |
3099 | } | |
3100 | else if (SCM_IMP (last_form)) | |
3101 | RETURN (SCM_EVALIM (last_form, env)); | |
3102 | else if (SCM_VARIABLEP (last_form)) | |
3103 | RETURN (SCM_VARIABLE_REF (last_form)); | |
3104 | else if (SCM_SYMBOLP (last_form)) | |
3105 | RETURN (*scm_lookupcar (x, env, 1)); | |
3106 | else | |
3107 | RETURN (last_form); | |
3108 | } | |
0f2d19dd JB |
3109 | |
3110 | ||
7e6e6b37 | 3111 | case (ISYMNUM (SCM_IM_CASE)): |
dec40cd2 DH |
3112 | x = SCM_CDR (x); |
3113 | { | |
b1cb24ff | 3114 | const SCM key = EVALCAR (x, env); |
dec40cd2 DH |
3115 | x = SCM_CDR (x); |
3116 | while (!SCM_NULLP (x)) | |
3117 | { | |
b1cb24ff | 3118 | const SCM clause = SCM_CAR (x); |
dec40cd2 DH |
3119 | SCM labels = SCM_CAR (clause); |
3120 | if (SCM_EQ_P (labels, SCM_IM_ELSE)) | |
3121 | { | |
3122 | x = SCM_CDR (clause); | |
3123 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3124 | goto begin; | |
3125 | } | |
3126 | while (!SCM_NULLP (labels)) | |
3127 | { | |
b1cb24ff | 3128 | const SCM label = SCM_CAR (labels); |
dec40cd2 DH |
3129 | if (SCM_EQ_P (label, key) |
3130 | || !SCM_FALSEP (scm_eqv_p (label, key))) | |
3131 | { | |
3132 | x = SCM_CDR (clause); | |
3133 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3134 | goto begin; | |
3135 | } | |
3136 | labels = SCM_CDR (labels); | |
3137 | } | |
3138 | x = SCM_CDR (x); | |
3139 | } | |
3140 | } | |
3141 | RETURN (SCM_UNSPECIFIED); | |
0f2d19dd JB |
3142 | |
3143 | ||
7e6e6b37 | 3144 | case (ISYMNUM (SCM_IM_COND)): |
dec40cd2 DH |
3145 | x = SCM_CDR (x); |
3146 | while (!SCM_NULLP (x)) | |
3147 | { | |
b1cb24ff | 3148 | const SCM clause = SCM_CAR (x); |
dec40cd2 DH |
3149 | if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE)) |
3150 | { | |
3151 | x = SCM_CDR (clause); | |
3152 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3153 | goto begin; | |
3154 | } | |
3155 | else | |
3156 | { | |
3157 | arg1 = EVALCAR (clause, env); | |
3158 | if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1)) | |
3159 | { | |
3160 | x = SCM_CDR (clause); | |
3161 | if (SCM_NULLP (x)) | |
3162 | RETURN (arg1); | |
3163 | else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW)) | |
3164 | { | |
3165 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3166 | goto begin; | |
3167 | } | |
3168 | else | |
3169 | { | |
3170 | proc = SCM_CDR (x); | |
3171 | proc = EVALCAR (proc, env); | |
3172 | PREP_APPLY (proc, scm_list_1 (arg1)); | |
3173 | ENTER_APPLY; | |
3174 | goto evap1; | |
3175 | } | |
3176 | } | |
3177 | x = SCM_CDR (x); | |
3178 | } | |
3179 | } | |
3180 | RETURN (SCM_UNSPECIFIED); | |
e5cb71a0 | 3181 | |
e5cb71a0 | 3182 | |
7e6e6b37 | 3183 | case (ISYMNUM (SCM_IM_DO)): |
dec40cd2 DH |
3184 | x = SCM_CDR (x); |
3185 | { | |
3186 | /* Compute the initialization values and the initial environment. */ | |
3187 | SCM init_forms = SCM_CAR (x); | |
3188 | SCM init_values = SCM_EOL; | |
3189 | while (!SCM_NULLP (init_forms)) | |
3190 | { | |
3191 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3192 | init_forms = SCM_CDR (init_forms); | |
3193 | } | |
3194 | x = SCM_CDR (x); | |
3195 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3196 | } | |
3197 | x = SCM_CDR (x); | |
3198 | { | |
3199 | SCM test_form = SCM_CAR (x); | |
3200 | SCM body_forms = SCM_CADR (x); | |
3201 | SCM step_forms = SCM_CDDR (x); | |
e5cb71a0 | 3202 | |
dec40cd2 | 3203 | SCM test_result = EVALCAR (test_form, env); |
e5cb71a0 | 3204 | |
dec40cd2 DH |
3205 | while (SCM_FALSEP (test_result) || SCM_NILP (test_result)) |
3206 | { | |
3207 | { | |
3208 | /* Evaluate body forms. */ | |
3209 | SCM temp_forms; | |
3210 | for (temp_forms = body_forms; | |
3211 | !SCM_NULLP (temp_forms); | |
3212 | temp_forms = SCM_CDR (temp_forms)) | |
3213 | { | |
3214 | SCM form = SCM_CAR (temp_forms); | |
b1cb24ff DH |
3215 | /* Dirk:FIXME: We only need to eval forms that may have |
3216 | * a side effect here. This is only true for forms that | |
3217 | * start with a pair. All others are just constants. | |
3218 | * Since with the current memoizer 'form' may hold a | |
3219 | * constant, we call EVAL here to handle the constant | |
3220 | * cases. In the long run it would make sense to have | |
3221 | * the macro transformer of 'do' eliminate all forms | |
3222 | * that have no sideeffect. Then instead of EVAL we | |
3223 | * could call CEVAL directly here. */ | |
3224 | (void) EVAL (form, env); | |
dec40cd2 DH |
3225 | } |
3226 | } | |
0f2d19dd | 3227 | |
dec40cd2 DH |
3228 | { |
3229 | /* Evaluate the step expressions. */ | |
3230 | SCM temp_forms; | |
3231 | SCM step_values = SCM_EOL; | |
3232 | for (temp_forms = step_forms; | |
3233 | !SCM_NULLP (temp_forms); | |
3234 | temp_forms = SCM_CDR (temp_forms)) | |
3235 | { | |
b1cb24ff | 3236 | const SCM value = EVALCAR (temp_forms, env); |
dec40cd2 DH |
3237 | step_values = scm_cons (value, step_values); |
3238 | } | |
3239 | env = SCM_EXTEND_ENV (SCM_CAAR (env), | |
3240 | step_values, | |
3241 | SCM_CDR (env)); | |
3242 | } | |
0f2d19dd | 3243 | |
dec40cd2 DH |
3244 | test_result = EVALCAR (test_form, env); |
3245 | } | |
3246 | } | |
3247 | x = SCM_CDAR (x); | |
3248 | if (SCM_NULLP (x)) | |
3249 | RETURN (SCM_UNSPECIFIED); | |
3250 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3251 | goto nontoplevel_begin; | |
0f2d19dd JB |
3252 | |
3253 | ||
7e6e6b37 | 3254 | case (ISYMNUM (SCM_IM_IF)): |
dec40cd2 DH |
3255 | x = SCM_CDR (x); |
3256 | { | |
3257 | SCM test_result = EVALCAR (x, env); | |
3258 | x = SCM_CDR (x); /* then expression */ | |
3259 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
3260 | { | |
3261 | x = SCM_CDR (x); /* else expression */ | |
3262 | if (SCM_NULLP (x)) | |
3263 | RETURN (SCM_UNSPECIFIED); | |
3264 | } | |
3265 | } | |
3266 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3267 | goto carloop; | |
0f2d19dd JB |
3268 | |
3269 | ||
7e6e6b37 | 3270 | case (ISYMNUM (SCM_IM_LET)): |
dec40cd2 DH |
3271 | x = SCM_CDR (x); |
3272 | { | |
3273 | SCM init_forms = SCM_CADR (x); | |
3274 | SCM init_values = SCM_EOL; | |
3275 | do | |
3276 | { | |
3277 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3278 | init_forms = SCM_CDR (init_forms); | |
3279 | } | |
3280 | while (!SCM_NULLP (init_forms)); | |
3281 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3282 | } | |
3283 | x = SCM_CDDR (x); | |
3284 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3285 | goto nontoplevel_begin; | |
0f2d19dd JB |
3286 | |
3287 | ||
7e6e6b37 | 3288 | case (ISYMNUM (SCM_IM_LETREC)): |
dec40cd2 DH |
3289 | x = SCM_CDR (x); |
3290 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); | |
3291 | x = SCM_CDR (x); | |
3292 | { | |
3293 | SCM init_forms = SCM_CAR (x); | |
3294 | SCM init_values = SCM_EOL; | |
3295 | do | |
3296 | { | |
3297 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3298 | init_forms = SCM_CDR (init_forms); | |
3299 | } | |
3300 | while (!SCM_NULLP (init_forms)); | |
3301 | SCM_SETCDR (SCM_CAR (env), init_values); | |
3302 | } | |
3303 | x = SCM_CDR (x); | |
3304 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3305 | goto nontoplevel_begin; | |
0f2d19dd | 3306 | |
302c12b4 | 3307 | |
7e6e6b37 | 3308 | case (ISYMNUM (SCM_IM_LETSTAR)): |
dec40cd2 DH |
3309 | x = SCM_CDR (x); |
3310 | { | |
3311 | SCM bindings = SCM_CAR (x); | |
3312 | if (SCM_NULLP (bindings)) | |
3313 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); | |
3314 | else | |
3315 | { | |
3316 | do | |
3317 | { | |
3318 | SCM name = SCM_CAR (bindings); | |
3319 | SCM init = SCM_CDR (bindings); | |
3320 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); | |
3321 | bindings = SCM_CDR (init); | |
3322 | } | |
3323 | while (!SCM_NULLP (bindings)); | |
3324 | } | |
3325 | } | |
3326 | x = SCM_CDR (x); | |
3327 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3328 | goto nontoplevel_begin; | |
0f2d19dd JB |
3329 | |
3330 | ||
7e6e6b37 | 3331 | case (ISYMNUM (SCM_IM_OR)): |
dec40cd2 DH |
3332 | x = SCM_CDR (x); |
3333 | while (!SCM_NULLP (SCM_CDR (x))) | |
3334 | { | |
3335 | SCM val = EVALCAR (x, env); | |
3336 | if (!SCM_FALSEP (val) && !SCM_NILP (val)) | |
3337 | RETURN (val); | |
3338 | else | |
3339 | x = SCM_CDR (x); | |
3340 | } | |
3341 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3342 | goto carloop; | |
0f2d19dd JB |
3343 | |
3344 | ||
7e6e6b37 | 3345 | case (ISYMNUM (SCM_IM_LAMBDA)): |
dec40cd2 | 3346 | RETURN (scm_closure (SCM_CDR (x), env)); |
0f2d19dd JB |
3347 | |
3348 | ||
7e6e6b37 | 3349 | case (ISYMNUM (SCM_IM_QUOTE)): |
dec40cd2 | 3350 | RETURN (SCM_CADR (x)); |
0f2d19dd JB |
3351 | |
3352 | ||
7e6e6b37 | 3353 | case (ISYMNUM (SCM_IM_SET_X)): |
dec40cd2 DH |
3354 | x = SCM_CDR (x); |
3355 | { | |
3356 | SCM *location; | |
3357 | SCM variable = SCM_CAR (x); | |
3358 | if (SCM_ILOCP (variable)) | |
3359 | location = scm_ilookup (variable, env); | |
3360 | else if (SCM_VARIABLEP (variable)) | |
3361 | location = SCM_VARIABLE_LOC (variable); | |
36245b66 DH |
3362 | else |
3363 | { | |
3364 | /* (SCM_SYMBOLP (variable)) is known to be true */ | |
3365 | variable = lazy_memoize_variable (variable, env); | |
3366 | SCM_SETCAR (x, variable); | |
3367 | location = SCM_VARIABLE_LOC (variable); | |
3368 | } | |
dec40cd2 DH |
3369 | x = SCM_CDR (x); |
3370 | *location = EVALCAR (x, env); | |
3371 | } | |
3372 | RETURN (SCM_UNSPECIFIED); | |
3f04400d DH |
3373 | |
3374 | ||
7e6e6b37 | 3375 | case (ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3376 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3377 | x = SCM_CDR (x); |
3378 | proc = EVALCAR (x, env); | |
3379 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3380 | |
3381 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3382 | x = SCM_CDR (x); |
3383 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3384 | |
3385 | apply_proc: | |
3386 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3387 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3388 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3389 | if (SCM_CLOSUREP (proc)) |
3390 | { | |
9a069bdd | 3391 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3392 | #ifdef DEVAL |
9a069bdd | 3393 | debug.info->a.args = arg1; |
6dbd0af5 | 3394 | #endif |
9a069bdd DH |
3395 | if (scm_badargsp (formals, arg1)) |
3396 | scm_wrong_num_args (proc); | |
3397 | ENTER_APPLY; | |
3398 | /* Copy argument list */ | |
3399 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3400 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3401 | else | |
3402 | { | |
3403 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3404 | SCM tail = args; | |
3405 | arg1 = SCM_CDR (arg1); | |
3406 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3407 | { | |
3408 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3409 | SCM_SETCDR (tail, new_tail); | |
3410 | tail = new_tail; | |
3411 | arg1 = SCM_CDR (arg1); | |
3412 | } | |
3413 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3414 | } | |
3415 | ||
3416 | x = SCM_CLOSURE_BODY (proc); | |
3417 | goto nontoplevel_begin; | |
0f2d19dd | 3418 | } |
3f04400d DH |
3419 | else |
3420 | { | |
e910e9d2 DH |
3421 | ENTER_APPLY; |
3422 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3423 | } |
3424 | ||
0f2d19dd | 3425 | |
7e6e6b37 | 3426 | case (ISYMNUM (SCM_IM_CONT)): |
5f144b10 GH |
3427 | { |
3428 | int first; | |
3429 | SCM val = scm_make_continuation (&first); | |
3430 | ||
e050d4f8 | 3431 | if (!first) |
5f144b10 | 3432 | RETURN (val); |
e050d4f8 DH |
3433 | else |
3434 | { | |
3435 | arg1 = val; | |
3436 | proc = SCM_CDR (x); | |
6bff1368 | 3437 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3438 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3439 | ENTER_APPLY; | |
e050d4f8 DH |
3440 | goto evap1; |
3441 | } | |
5f144b10 | 3442 | } |
e050d4f8 | 3443 | |
0f2d19dd | 3444 | |
7e6e6b37 | 3445 | case (ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3446 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3447 | |
e050d4f8 | 3448 | |
7e6e6b37 | 3449 | case (ISYMNUM (SCM_IM_FUTURE)): |
28d52ebb MD |
3450 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); |
3451 | ||
3452 | ||
7e6e6b37 DH |
3453 | /* PLACEHOLDER for case (ISYMNUM (SCM_IM_DISPATCH)): The following |
3454 | code (type_dispatch) is intended to be the tail of the case | |
3455 | clause for the internal macro SCM_IM_DISPATCH. Please don't | |
3456 | remove it from this location without discussing it with Mikael | |
c8e1d354 MD |
3457 | <djurfeldt@nada.kth.se> */ |
3458 | ||
f12745b6 DH |
3459 | /* The type dispatch code is duplicated below |
3460 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3461 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3462 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3463 | /* Type dispatch means to determine from the types of the function |
3464 | * arguments (i. e. the 'signature' of the call), which method from | |
3465 | * a generic function is to be called. This process of selecting | |
3466 | * the right method takes some time. To speed it up, guile uses | |
3467 | * caching: Together with the macro call to dispatch the signatures | |
3468 | * of some previous calls to that generic function from the same | |
3469 | * place are stored (in the code!) in a cache that we call the | |
3470 | * 'method cache'. This is done since it is likely, that | |
3471 | * consecutive calls to dispatch from that position in the code will | |
3472 | * have the same signature. Thus, the type dispatch works as | |
3473 | * follows: First, determine a hash value from the signature of the | |
3474 | * actual arguments. Second, use this hash value as an index to | |
3475 | * find that same signature in the method cache stored at this | |
3476 | * position in the code. If found, you have also found the | |
3477 | * corresponding method that belongs to that signature. If the | |
3478 | * signature is not found in the method cache, you have to perform a | |
3479 | * full search over all signatures stored with the generic | |
3480 | * function. */ | |
3481 | { | |
3482 | unsigned long int specializers; | |
3483 | unsigned long int hash_value; | |
3484 | unsigned long int cache_end_pos; | |
3485 | unsigned long int mask; | |
3486 | SCM method_cache; | |
3487 | ||
3488 | { | |
3489 | SCM z = SCM_CDDR (x); | |
3490 | SCM tmp = SCM_CADR (z); | |
3491 | specializers = SCM_INUM (SCM_CAR (z)); | |
3492 | ||
3493 | /* Compute a hash value for searching the method cache. There | |
3494 | * are two variants for computing the hash value, a (rather) | |
3495 | * complicated one, and a simple one. For the complicated one | |
3496 | * explained below, tmp holds a number that is used in the | |
3497 | * computation. */ | |
3498 | if (SCM_INUMP (tmp)) | |
3499 | { | |
3500 | /* Use the signature of the actual arguments to determine | |
3501 | * the hash value. This is done as follows: Each class has | |
3502 | * an array of random numbers, that are determined when the | |
3503 | * class is created. The integer 'hashset' is an index into | |
3504 | * that array of random numbers. Now, from all classes that | |
3505 | * are part of the signature of the actual arguments, the | |
3506 | * random numbers at index 'hashset' are taken and summed | |
3507 | * up, giving the hash value. The value of 'hashset' is | |
3508 | * stored at the call to dispatch. This allows to have | |
3509 | * different 'formulas' for calculating the hash value at | |
3510 | * different places where dispatch is called. This allows | |
3511 | * to optimize the hash formula at every individual place | |
3512 | * where dispatch is called, such that hopefully the hash | |
3513 | * value that is computed will directly point to the right | |
3514 | * method in the method cache. */ | |
3515 | unsigned long int hashset = SCM_INUM (tmp); | |
3516 | unsigned long int counter = specializers + 1; | |
dff98306 | 3517 | SCM tmp_arg = arg1; |
f12745b6 DH |
3518 | hash_value = 0; |
3519 | while (!SCM_NULLP (tmp_arg) && counter != 0) | |
61364ba6 | 3520 | { |
f12745b6 DH |
3521 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3522 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3523 | tmp_arg = SCM_CDR (tmp_arg); | |
3524 | counter--; | |
61364ba6 | 3525 | } |
f12745b6 DH |
3526 | z = SCM_CDDR (z); |
3527 | method_cache = SCM_CADR (z); | |
3528 | mask = SCM_INUM (SCM_CAR (z)); | |
3529 | hash_value &= mask; | |
3530 | cache_end_pos = hash_value; | |
3531 | } | |
3532 | else | |
3533 | { | |
3534 | /* This method of determining the hash value is much | |
3535 | * simpler: Set the hash value to zero and just perform a | |
3536 | * linear search through the method cache. */ | |
3537 | method_cache = tmp; | |
3538 | mask = (unsigned long int) ((long) -1); | |
3539 | hash_value = 0; | |
3540 | cache_end_pos = SCM_VECTOR_LENGTH (method_cache); | |
3541 | } | |
3542 | } | |
61364ba6 | 3543 | |
f12745b6 DH |
3544 | { |
3545 | /* Search the method cache for a method with a matching | |
3546 | * signature. Start the search at position 'hash_value'. The | |
3547 | * hashing implementation uses linear probing for conflict | |
3548 | * resolution, that is, if the signature in question is not | |
3549 | * found at the starting index in the hash table, the next table | |
3550 | * entry is tried, and so on, until in the worst case the whole | |
3551 | * cache has been searched, but still the signature has not been | |
3552 | * found. */ | |
3553 | SCM z; | |
3554 | do | |
3555 | { | |
dff98306 | 3556 | SCM args = arg1; /* list of arguments */ |
f12745b6 DH |
3557 | z = SCM_VELTS (method_cache)[hash_value]; |
3558 | while (!SCM_NULLP (args)) | |
61364ba6 MD |
3559 | { |
3560 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 DH |
3561 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
3562 | if (!SCM_EQ_P (class_of_arg, SCM_CAR (z))) | |
61364ba6 | 3563 | goto next_method; |
f12745b6 | 3564 | args = SCM_CDR (args); |
61364ba6 MD |
3565 | z = SCM_CDR (z); |
3566 | } | |
f12745b6 DH |
3567 | /* Fewer arguments than specifiers => CAR != ENV */ |
3568 | if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))) | |
3569 | goto apply_cmethod; | |
3570 | next_method: | |
3571 | hash_value = (hash_value + 1) & mask; | |
3572 | } while (hash_value != cache_end_pos); | |
3573 | ||
3574 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3575 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3576 | |
dff98306 | 3577 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3578 | { |
3579 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3580 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3581 | x = SCM_CMETHOD_BODY (z); |
3582 | goto nontoplevel_begin; | |
3583 | } | |
3584 | } | |
61364ba6 | 3585 | } |
73b64342 | 3586 | |
1d15ecd3 | 3587 | |
7e6e6b37 | 3588 | case (ISYMNUM (SCM_IM_SLOT_REF)): |
ca4be6ea | 3589 | x = SCM_CDR (x); |
1d15ecd3 DH |
3590 | { |
3591 | SCM instance = EVALCAR (x, env); | |
3592 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3593 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); | |
3594 | } | |
3595 | ||
3596 | ||
7e6e6b37 | 3597 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): |
ca4be6ea | 3598 | x = SCM_CDR (x); |
1d15ecd3 DH |
3599 | { |
3600 | SCM instance = EVALCAR (x, env); | |
3601 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3602 | SCM value = EVALCAR (SCM_CDDR (x), env); | |
3603 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3604 | RETURN (SCM_UNSPECIFIED); | |
3605 | } | |
3606 | ||
c96d76b8 | 3607 | |
22721140 | 3608 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3609 | |
7e6e6b37 | 3610 | case (ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3611 | { |
3612 | SCM test_form = SCM_CDR (x); | |
3613 | x = SCM_CDR (test_form); | |
3614 | while (!SCM_NULL_OR_NIL_P (x)) | |
3615 | { | |
3616 | SCM test_result = EVALCAR (test_form, env); | |
3617 | if (!(SCM_FALSEP (test_result) | |
3618 | || SCM_NULL_OR_NIL_P (test_result))) | |
3619 | { | |
3620 | if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED)) | |
3621 | RETURN (test_result); | |
3622 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3623 | goto carloop; | |
3624 | } | |
3625 | else | |
3626 | { | |
3627 | test_form = SCM_CDR (x); | |
3628 | x = SCM_CDR (test_form); | |
3629 | } | |
3630 | } | |
3631 | x = test_form; | |
3632 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3633 | goto carloop; | |
3634 | } | |
73b64342 | 3635 | |
c96d76b8 | 3636 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 | 3637 | |
7e6e6b37 | 3638 | case (ISYMNUM (SCM_IM_BIND)): |
2e171178 MV |
3639 | { |
3640 | SCM vars, exps, vals; | |
73b64342 | 3641 | |
2e171178 MV |
3642 | x = SCM_CDR (x); |
3643 | vars = SCM_CAAR (x); | |
3644 | exps = SCM_CDAR (x); | |
2e171178 | 3645 | vals = SCM_EOL; |
82b3e2c6 | 3646 | while (!SCM_NULLP (exps)) |
2e171178 MV |
3647 | { |
3648 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3649 | exps = SCM_CDR (exps); | |
3650 | } | |
3651 | ||
3652 | scm_swap_bindings (vars, vals); | |
3653 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3654 | |
3655 | /* Ignore all but the last evaluation result. */ | |
3656 | for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x)) | |
2e171178 | 3657 | { |
1d15ecd3 | 3658 | if (SCM_CONSP (SCM_CAR (x))) |
434f2f7a | 3659 | CEVAL (SCM_CAR (x), env); |
2e171178 MV |
3660 | } |
3661 | proc = EVALCAR (x, env); | |
73b64342 | 3662 | |
2e171178 MV |
3663 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3664 | scm_swap_bindings (vars, vals); | |
73b64342 | 3665 | |
ddea3325 | 3666 | RETURN (proc); |
2e171178 | 3667 | } |
c96d76b8 | 3668 | |
1d15ecd3 | 3669 | |
7e6e6b37 | 3670 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 3671 | { |
9a069bdd DH |
3672 | SCM producer; |
3673 | ||
3674 | x = SCM_CDR (x); | |
3675 | producer = EVALCAR (x, env); | |
3676 | x = SCM_CDR (x); | |
3677 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3678 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3679 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3680 | { |
3681 | /* The list of arguments is not copied. Rather, it is assumed | |
3682 | * that this has been done by the 'values' procedure. */ | |
3683 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3684 | } | |
a513ead3 | 3685 | else |
82b3e2c6 DH |
3686 | { |
3687 | arg1 = scm_list_1 (arg1); | |
3688 | } | |
9a069bdd DH |
3689 | PREP_APPLY (proc, arg1); |
3690 | goto apply_proc; | |
a513ead3 MV |
3691 | } |
3692 | ||
b7798e10 | 3693 | |
0f2d19dd | 3694 | default: |
dec40cd2 | 3695 | break; |
0f2d19dd | 3696 | } |
dec40cd2 DH |
3697 | } |
3698 | else | |
3699 | { | |
434f2f7a DH |
3700 | if (SCM_VARIABLEP (SCM_CAR (x))) |
3701 | proc = SCM_VARIABLE_REF (SCM_CAR (x)); | |
f9986767 DH |
3702 | else if (SCM_ILOCP (SCM_CAR (x))) |
3703 | proc = *scm_ilookup (SCM_CAR (x), env); | |
434f2f7a DH |
3704 | else if (SCM_CONSP (SCM_CAR (x))) |
3705 | proc = CEVAL (SCM_CAR (x), env); | |
3706 | else if (SCM_SYMBOLP (SCM_CAR (x))) | |
0f2d19dd | 3707 | { |
e050d4f8 | 3708 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3709 | { |
3710 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3711 | if (location == NULL) | |
3712 | { | |
3713 | /* we have lost the race, start again. */ | |
3714 | goto dispatch; | |
3715 | } | |
3716 | proc = *location; | |
3717 | } | |
f8769b1d | 3718 | |
22a52da1 | 3719 | if (SCM_MACROP (proc)) |
0f2d19dd | 3720 | { |
86d31dfe MV |
3721 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3722 | lookupcar */ | |
e050d4f8 | 3723 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3724 | #ifdef DEVAL |
7c354052 MD |
3725 | /* Set a flag during macro expansion so that macro |
3726 | application frames can be deleted from the backtrace. */ | |
3727 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3728 | #endif |
dff98306 | 3729 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 3730 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
3731 | #ifdef DEVAL |
3732 | SCM_CLEAR_MACROEXP (debug); | |
3733 | #endif | |
22a52da1 | 3734 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3735 | { |
3b88ed2a | 3736 | case 3: |
0f2d19dd | 3737 | case 2: |
dff98306 DH |
3738 | if (scm_ilength (arg1) <= 0) |
3739 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); | |
6dbd0af5 | 3740 | #ifdef DEVAL |
22a52da1 | 3741 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3742 | { |
6dbd0af5 | 3743 | SCM_DEFER_INTS; |
dff98306 DH |
3744 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3745 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
3746 | SCM_ALLOW_INTS; |
3747 | goto dispatch; | |
3748 | } | |
3749 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
3750 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
3751 | SCM_CAR (x), | |
3752 | SCM_CDR (x)); | |
6dbd0af5 | 3753 | #endif |
0f2d19dd | 3754 | SCM_DEFER_INTS; |
dff98306 DH |
3755 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3756 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 3757 | SCM_ALLOW_INTS; |
680516ba DH |
3758 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3759 | goto loop; | |
3063e30a | 3760 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 3761 | case 1: |
680516ba DH |
3762 | x = arg1; |
3763 | if (SCM_NIMP (x)) | |
3764 | { | |
3765 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3766 | goto loop; | |
3767 | } | |
3768 | else | |
3769 | RETURN (arg1); | |
3063e30a | 3770 | #endif |
0f2d19dd | 3771 | case 0: |
dff98306 | 3772 | RETURN (arg1); |
0f2d19dd JB |
3773 | } |
3774 | } | |
3775 | } | |
3776 | else | |
434f2f7a | 3777 | proc = SCM_CAR (x); |
bd987b8e | 3778 | |
ddd8f927 | 3779 | if (SCM_MACROP (proc)) |
0f2d19dd | 3780 | goto handle_a_macro; |
0f2d19dd JB |
3781 | } |
3782 | ||
3783 | ||
dec40cd2 DH |
3784 | /* When reaching this part of the code, the following is granted: Variable x |
3785 | * holds the first pair of an expression of the form (<function> arg ...). | |
3786 | * Variable proc holds the object that resulted from the evaluation of | |
3787 | * <function>. In the following, the arguments (if any) will be evaluated, | |
3788 | * and proc will be applied to them. If proc does not really hold a | |
3789 | * function object, this will be signalled as an error on the scheme | |
3790 | * level. If the number of arguments does not match the number of arguments | |
3791 | * that are allowed to be passed to proc, also an error on the scheme level | |
3792 | * will be signalled. */ | |
6dbd0af5 MD |
3793 | PREP_APPLY (proc, SCM_EOL); |
3794 | if (SCM_NULLP (SCM_CDR (x))) { | |
3795 | ENTER_APPLY; | |
89efbff4 | 3796 | evap0: |
ddd8f927 | 3797 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
3798 | switch (SCM_TYP7 (proc)) |
3799 | { /* no arguments given */ | |
3800 | case scm_tc7_subr_0: | |
3801 | RETURN (SCM_SUBRF (proc) ()); | |
3802 | case scm_tc7_subr_1o: | |
3803 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
3804 | case scm_tc7_lsubr: | |
3805 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
3806 | case scm_tc7_rpsubr: | |
3807 | RETURN (SCM_BOOL_T); | |
3808 | case scm_tc7_asubr: | |
3809 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 3810 | case scm_tc7_smob: |
68b06924 | 3811 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 3812 | goto badfun; |
68b06924 | 3813 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 3814 | case scm_tc7_cclo: |
dff98306 | 3815 | arg1 = proc; |
0f2d19dd | 3816 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
3817 | #ifdef DEVAL |
3818 | debug.info->a.proc = proc; | |
dff98306 | 3819 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3820 | #endif |
0f2d19dd | 3821 | goto evap1; |
89efbff4 MD |
3822 | case scm_tc7_pws: |
3823 | proc = SCM_PROCEDURE (proc); | |
3824 | #ifdef DEVAL | |
3825 | debug.info->a.proc = proc; | |
3826 | #endif | |
002f1a5d MD |
3827 | if (!SCM_CLOSUREP (proc)) |
3828 | goto evap0; | |
ddd8f927 | 3829 | /* fallthrough */ |
0f2d19dd | 3830 | case scm_tcs_closures: |
ddd8f927 DH |
3831 | { |
3832 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3833 | if (SCM_CONSP (formals)) | |
3834 | goto umwrongnumargs; | |
3835 | x = SCM_CLOSURE_BODY (proc); | |
3836 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3837 | goto nontoplevel_begin; | |
3838 | } | |
904a077d | 3839 | case scm_tcs_struct: |
195847fa MD |
3840 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
3841 | { | |
3842 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 3843 | arg1 = SCM_EOL; |
195847fa MD |
3844 | goto type_dispatch; |
3845 | } | |
2ca0d207 | 3846 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 3847 | { |
dff98306 | 3848 | arg1 = proc; |
195847fa MD |
3849 | proc = (SCM_I_ENTITYP (proc) |
3850 | ? SCM_ENTITY_PROCEDURE (proc) | |
3851 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 3852 | #ifdef DEVAL |
195847fa | 3853 | debug.info->a.proc = proc; |
dff98306 | 3854 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 3855 | #endif |
ddd8f927 | 3856 | goto evap1; |
da7f71d7 | 3857 | } |
2ca0d207 DH |
3858 | else |
3859 | goto badfun; | |
0f2d19dd JB |
3860 | case scm_tc7_subr_1: |
3861 | case scm_tc7_subr_2: | |
3862 | case scm_tc7_subr_2o: | |
14b18ed6 | 3863 | case scm_tc7_dsubr: |
0f2d19dd JB |
3864 | case scm_tc7_cxr: |
3865 | case scm_tc7_subr_3: | |
3866 | case scm_tc7_lsubr_2: | |
3867 | umwrongnumargs: | |
3868 | unmemocar (x, env); | |
f5bf2977 | 3869 | scm_wrong_num_args (proc); |
0f2d19dd | 3870 | default: |
ddd8f927 DH |
3871 | badfun: |
3872 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 3873 | } |
6dbd0af5 | 3874 | } |
0f2d19dd JB |
3875 | |
3876 | /* must handle macros by here */ | |
3877 | x = SCM_CDR (x); | |
dff98306 DH |
3878 | if (SCM_CONSP (x)) |
3879 | arg1 = EVALCAR (x, env); | |
680ed4a8 | 3880 | else |
ab1f1094 | 3881 | scm_wrong_num_args (proc); |
6dbd0af5 | 3882 | #ifdef DEVAL |
dff98306 | 3883 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3884 | #endif |
0f2d19dd | 3885 | x = SCM_CDR (x); |
42030fb2 DH |
3886 | { |
3887 | SCM arg2; | |
3888 | if (SCM_NULLP (x)) | |
3889 | { | |
3890 | ENTER_APPLY; | |
3891 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 3892 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3893 | switch (SCM_TYP7 (proc)) |
3894 | { /* have one argument in arg1 */ | |
3895 | case scm_tc7_subr_2o: | |
3896 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3897 | case scm_tc7_subr_1: | |
3898 | case scm_tc7_subr_1o: | |
3899 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
3900 | case scm_tc7_dsubr: |
3901 | if (SCM_INUMP (arg1)) | |
3902 | { | |
3903 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
3904 | } | |
3905 | else if (SCM_REALP (arg1)) | |
3906 | { | |
3907 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
3908 | } | |
3909 | else if (SCM_BIGP (arg1)) | |
3910 | { | |
3911 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
3912 | } | |
f92e85f7 MV |
3913 | else if (SCM_FRACTIONP (arg1)) |
3914 | { | |
3915 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
3916 | } | |
3917 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
14b18ed6 | 3918 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); |
42030fb2 | 3919 | case scm_tc7_cxr: |
42030fb2 | 3920 | { |
14b18ed6 DH |
3921 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
3922 | do | |
3923 | { | |
3924 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
3925 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
3926 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
3927 | pattern >>= 2; | |
3928 | } while (pattern); | |
42030fb2 | 3929 | RETURN (arg1); |
0f2d19dd | 3930 | } |
42030fb2 DH |
3931 | case scm_tc7_rpsubr: |
3932 | RETURN (SCM_BOOL_T); | |
3933 | case scm_tc7_asubr: | |
3934 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3935 | case scm_tc7_lsubr: | |
0f2d19dd | 3936 | #ifdef DEVAL |
42030fb2 | 3937 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 3938 | #else |
42030fb2 | 3939 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 3940 | #endif |
42030fb2 DH |
3941 | case scm_tc7_smob: |
3942 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3943 | goto badfun; | |
3944 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
3945 | case scm_tc7_cclo: | |
3946 | arg2 = arg1; | |
3947 | arg1 = proc; | |
3948 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 3949 | #ifdef DEVAL |
42030fb2 DH |
3950 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3951 | debug.info->a.proc = proc; | |
6dbd0af5 | 3952 | #endif |
42030fb2 DH |
3953 | goto evap2; |
3954 | case scm_tc7_pws: | |
3955 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 3956 | #ifdef DEVAL |
42030fb2 | 3957 | debug.info->a.proc = proc; |
89efbff4 | 3958 | #endif |
42030fb2 DH |
3959 | if (!SCM_CLOSUREP (proc)) |
3960 | goto evap1; | |
ddd8f927 | 3961 | /* fallthrough */ |
42030fb2 | 3962 | case scm_tcs_closures: |
ddd8f927 DH |
3963 | { |
3964 | /* clos1: */ | |
3965 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3966 | if (SCM_NULLP (formals) | |
3967 | || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals)))) | |
3968 | goto umwrongnumargs; | |
3969 | x = SCM_CLOSURE_BODY (proc); | |
0f2d19dd | 3970 | #ifdef DEVAL |
ddd8f927 DH |
3971 | env = SCM_EXTEND_ENV (formals, |
3972 | debug.info->a.args, | |
3973 | SCM_ENV (proc)); | |
0f2d19dd | 3974 | #else |
ddd8f927 DH |
3975 | env = SCM_EXTEND_ENV (formals, |
3976 | scm_list_1 (arg1), | |
3977 | SCM_ENV (proc)); | |
0f2d19dd | 3978 | #endif |
ddd8f927 DH |
3979 | goto nontoplevel_begin; |
3980 | } | |
42030fb2 DH |
3981 | case scm_tcs_struct: |
3982 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3983 | { | |
3984 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 3985 | #ifdef DEVAL |
42030fb2 | 3986 | arg1 = debug.info->a.args; |
f3d2630a | 3987 | #else |
42030fb2 | 3988 | arg1 = scm_list_1 (arg1); |
f3d2630a | 3989 | #endif |
42030fb2 DH |
3990 | goto type_dispatch; |
3991 | } | |
2ca0d207 | 3992 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3993 | { |
3994 | arg2 = arg1; | |
3995 | arg1 = proc; | |
3996 | proc = (SCM_I_ENTITYP (proc) | |
3997 | ? SCM_ENTITY_PROCEDURE (proc) | |
3998 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 3999 | #ifdef DEVAL |
42030fb2 DH |
4000 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4001 | debug.info->a.proc = proc; | |
0c32d76c | 4002 | #endif |
ddd8f927 | 4003 | goto evap2; |
42030fb2 | 4004 | } |
2ca0d207 DH |
4005 | else |
4006 | goto badfun; | |
42030fb2 DH |
4007 | case scm_tc7_subr_2: |
4008 | case scm_tc7_subr_0: | |
4009 | case scm_tc7_subr_3: | |
4010 | case scm_tc7_lsubr_2: | |
ab1f1094 | 4011 | scm_wrong_num_args (proc); |
42030fb2 DH |
4012 | default: |
4013 | goto badfun; | |
4014 | } | |
4015 | } | |
42030fb2 DH |
4016 | if (SCM_CONSP (x)) |
4017 | arg2 = EVALCAR (x, env); | |
4018 | else | |
ab1f1094 | 4019 | scm_wrong_num_args (proc); |
bd987b8e | 4020 | |
42030fb2 | 4021 | { /* have two or more arguments */ |
6dbd0af5 | 4022 | #ifdef DEVAL |
42030fb2 | 4023 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 4024 | #endif |
42030fb2 DH |
4025 | x = SCM_CDR (x); |
4026 | if (SCM_NULLP (x)) { | |
4027 | ENTER_APPLY; | |
4028 | evap2: | |
ddd8f927 | 4029 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4030 | switch (SCM_TYP7 (proc)) |
4031 | { /* have two arguments */ | |
4032 | case scm_tc7_subr_2: | |
4033 | case scm_tc7_subr_2o: | |
4034 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4035 | case scm_tc7_lsubr: | |
0f2d19dd | 4036 | #ifdef DEVAL |
42030fb2 | 4037 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 4038 | #else |
42030fb2 DH |
4039 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
4040 | #endif | |
4041 | case scm_tc7_lsubr_2: | |
4042 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
4043 | case scm_tc7_rpsubr: | |
4044 | case scm_tc7_asubr: | |
4045 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4046 | case scm_tc7_smob: | |
4047 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4048 | goto badfun; | |
4049 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
4050 | cclon: | |
4051 | case scm_tc7_cclo: | |
0f2d19dd | 4052 | #ifdef DEVAL |
42030fb2 DH |
4053 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4054 | scm_cons (proc, debug.info->a.args), | |
4055 | SCM_EOL)); | |
0f2d19dd | 4056 | #else |
42030fb2 DH |
4057 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4058 | scm_cons2 (proc, arg1, | |
4059 | scm_cons (arg2, | |
4060 | scm_eval_args (x, | |
4061 | env, | |
4062 | proc))), | |
4063 | SCM_EOL)); | |
4064 | #endif | |
4065 | case scm_tcs_struct: | |
4066 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4067 | { | |
4068 | x = SCM_ENTITY_PROCEDURE (proc); | |
4069 | #ifdef DEVAL | |
4070 | arg1 = debug.info->a.args; | |
4071 | #else | |
4072 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 4073 | #endif |
42030fb2 DH |
4074 | goto type_dispatch; |
4075 | } | |
2ca0d207 | 4076 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4077 | { |
4078 | operatorn: | |
f3d2630a | 4079 | #ifdef DEVAL |
42030fb2 DH |
4080 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4081 | ? SCM_ENTITY_PROCEDURE (proc) | |
4082 | : SCM_OPERATOR_PROCEDURE (proc), | |
4083 | scm_cons (proc, debug.info->a.args), | |
4084 | SCM_EOL)); | |
f3d2630a | 4085 | #else |
42030fb2 DH |
4086 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4087 | ? SCM_ENTITY_PROCEDURE (proc) | |
4088 | : SCM_OPERATOR_PROCEDURE (proc), | |
4089 | scm_cons2 (proc, arg1, | |
4090 | scm_cons (arg2, | |
4091 | scm_eval_args (x, | |
4092 | env, | |
4093 | proc))), | |
4094 | SCM_EOL)); | |
f3d2630a | 4095 | #endif |
42030fb2 | 4096 | } |
2ca0d207 DH |
4097 | else |
4098 | goto badfun; | |
42030fb2 | 4099 | case scm_tc7_subr_0: |
14b18ed6 | 4100 | case scm_tc7_dsubr: |
42030fb2 DH |
4101 | case scm_tc7_cxr: |
4102 | case scm_tc7_subr_1o: | |
4103 | case scm_tc7_subr_1: | |
4104 | case scm_tc7_subr_3: | |
ab1f1094 | 4105 | scm_wrong_num_args (proc); |
42030fb2 | 4106 | default: |
9b07e212 | 4107 | goto badfun; |
42030fb2 DH |
4108 | case scm_tc7_pws: |
4109 | proc = SCM_PROCEDURE (proc); | |
4110 | #ifdef DEVAL | |
4111 | debug.info->a.proc = proc; | |
4112 | #endif | |
4113 | if (!SCM_CLOSUREP (proc)) | |
4114 | goto evap2; | |
ddd8f927 | 4115 | /* fallthrough */ |
42030fb2 | 4116 | case scm_tcs_closures: |
ddd8f927 DH |
4117 | { |
4118 | /* clos2: */ | |
4119 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4120 | if (SCM_NULLP (formals) | |
4121 | || (SCM_CONSP (formals) | |
4122 | && (SCM_NULLP (SCM_CDR (formals)) | |
4123 | || (SCM_CONSP (SCM_CDR (formals)) | |
4124 | && SCM_CONSP (SCM_CDDR (formals)))))) | |
4125 | goto umwrongnumargs; | |
0c32d76c | 4126 | #ifdef DEVAL |
ddd8f927 DH |
4127 | env = SCM_EXTEND_ENV (formals, |
4128 | debug.info->a.args, | |
4129 | SCM_ENV (proc)); | |
195847fa | 4130 | #else |
ddd8f927 DH |
4131 | env = SCM_EXTEND_ENV (formals, |
4132 | scm_list_2 (arg1, arg2), | |
4133 | SCM_ENV (proc)); | |
195847fa | 4134 | #endif |
ddd8f927 DH |
4135 | x = SCM_CLOSURE_BODY (proc); |
4136 | goto nontoplevel_begin; | |
4137 | } | |
42030fb2 DH |
4138 | } |
4139 | } | |
42030fb2 | 4140 | if (!SCM_CONSP (x)) |
ab1f1094 | 4141 | scm_wrong_num_args (proc); |
42030fb2 DH |
4142 | #ifdef DEVAL |
4143 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4144 | deval_args (x, env, proc, | |
4145 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4146 | #endif | |
4147 | ENTER_APPLY; | |
4148 | evap3: | |
ddd8f927 | 4149 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4150 | switch (SCM_TYP7 (proc)) |
4151 | { /* have 3 or more arguments */ | |
4152 | #ifdef DEVAL | |
6dbd0af5 | 4153 | case scm_tc7_subr_3: |
ab1f1094 DH |
4154 | if (!SCM_NULLP (SCM_CDR (x))) |
4155 | scm_wrong_num_args (proc); | |
4156 | else | |
4157 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4158 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4159 | case scm_tc7_asubr: |
4160 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4161 | arg2 = SCM_CDDR (debug.info->a.args); | |
4162 | do | |
4163 | { | |
4164 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4165 | arg2 = SCM_CDR (arg2); | |
4166 | } | |
4167 | while (SCM_NIMP (arg2)); | |
4168 | RETURN (arg1); | |
4169 | case scm_tc7_rpsubr: | |
4170 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4171 | RETURN (SCM_BOOL_F); | |
4172 | arg1 = SCM_CDDR (debug.info->a.args); | |
4173 | do | |
4174 | { | |
4175 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) | |
4176 | RETURN (SCM_BOOL_F); | |
4177 | arg2 = SCM_CAR (arg1); | |
4178 | arg1 = SCM_CDR (arg1); | |
4179 | } | |
4180 | while (SCM_NIMP (arg1)); | |
4181 | RETURN (SCM_BOOL_T); | |
4182 | case scm_tc7_lsubr_2: | |
4183 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4184 | SCM_CDDR (debug.info->a.args))); | |
4185 | case scm_tc7_lsubr: | |
4186 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4187 | case scm_tc7_smob: | |
4188 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4189 | goto badfun; | |
4190 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4191 | SCM_CDDR (debug.info->a.args))); | |
4192 | case scm_tc7_cclo: | |
4193 | goto cclon; | |
002f1a5d MD |
4194 | case scm_tc7_pws: |
4195 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4196 | debug.info->a.proc = proc; |
002f1a5d | 4197 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4198 | goto evap3; |
ddd8f927 | 4199 | /* fallthrough */ |
6dbd0af5 | 4200 | case scm_tcs_closures: |
ddd8f927 DH |
4201 | { |
4202 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4203 | if (SCM_NULLP (formals) | |
4204 | || (SCM_CONSP (formals) | |
4205 | && (SCM_NULLP (SCM_CDR (formals)) | |
4206 | || (SCM_CONSP (SCM_CDR (formals)) | |
4207 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4208 | goto umwrongnumargs; | |
4209 | SCM_SET_ARGSREADY (debug); | |
4210 | env = SCM_EXTEND_ENV (formals, | |
4211 | debug.info->a.args, | |
4212 | SCM_ENV (proc)); | |
4213 | x = SCM_CLOSURE_BODY (proc); | |
4214 | goto nontoplevel_begin; | |
4215 | } | |
6dbd0af5 | 4216 | #else /* DEVAL */ |
42030fb2 | 4217 | case scm_tc7_subr_3: |
ab1f1094 DH |
4218 | if (!SCM_NULLP (SCM_CDR (x))) |
4219 | scm_wrong_num_args (proc); | |
4220 | else | |
4221 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4222 | case scm_tc7_asubr: |
4223 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4224 | do | |
4225 | { | |
4226 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4227 | x = SCM_CDR(x); | |
4228 | } | |
6bff1368 | 4229 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4230 | RETURN (arg1); |
4231 | case scm_tc7_rpsubr: | |
4232 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4233 | RETURN (SCM_BOOL_F); | |
4234 | do | |
4235 | { | |
4236 | arg1 = EVALCAR (x, env); | |
4237 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1))) | |
4238 | RETURN (SCM_BOOL_F); | |
4239 | arg2 = arg1; | |
4240 | x = SCM_CDR (x); | |
4241 | } | |
6bff1368 | 4242 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4243 | RETURN (SCM_BOOL_T); |
4244 | case scm_tc7_lsubr_2: | |
4245 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4246 | case scm_tc7_lsubr: | |
4247 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4248 | arg2, | |
4249 | scm_eval_args (x, env, proc)))); | |
4250 | case scm_tc7_smob: | |
4251 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4252 | goto badfun; | |
4253 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4254 | scm_eval_args (x, env, proc))); | |
4255 | case scm_tc7_cclo: | |
4256 | goto cclon; | |
4257 | case scm_tc7_pws: | |
4258 | proc = SCM_PROCEDURE (proc); | |
4259 | if (!SCM_CLOSUREP (proc)) | |
4260 | goto evap3; | |
ddd8f927 DH |
4261 | /* fallthrough */ |
4262 | case scm_tcs_closures: | |
da7f71d7 | 4263 | { |
ddd8f927 | 4264 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
42030fb2 DH |
4265 | if (SCM_NULLP (formals) |
4266 | || (SCM_CONSP (formals) | |
4267 | && (SCM_NULLP (SCM_CDR (formals)) | |
4268 | || (SCM_CONSP (SCM_CDR (formals)) | |
4269 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4270 | goto umwrongnumargs; | |
ddd8f927 DH |
4271 | env = SCM_EXTEND_ENV (formals, |
4272 | scm_cons2 (arg1, | |
4273 | arg2, | |
4274 | scm_eval_args (x, env, proc)), | |
4275 | SCM_ENV (proc)); | |
4276 | x = SCM_CLOSURE_BODY (proc); | |
4277 | goto nontoplevel_begin; | |
da7f71d7 | 4278 | } |
0f2d19dd | 4279 | #endif /* DEVAL */ |
42030fb2 DH |
4280 | case scm_tcs_struct: |
4281 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4282 | { | |
f3d2630a | 4283 | #ifdef DEVAL |
42030fb2 | 4284 | arg1 = debug.info->a.args; |
f3d2630a | 4285 | #else |
42030fb2 | 4286 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4287 | #endif |
42030fb2 DH |
4288 | x = SCM_ENTITY_PROCEDURE (proc); |
4289 | goto type_dispatch; | |
4290 | } | |
2ca0d207 | 4291 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4292 | goto operatorn; |
2ca0d207 DH |
4293 | else |
4294 | goto badfun; | |
42030fb2 DH |
4295 | case scm_tc7_subr_2: |
4296 | case scm_tc7_subr_1o: | |
4297 | case scm_tc7_subr_2o: | |
4298 | case scm_tc7_subr_0: | |
14b18ed6 | 4299 | case scm_tc7_dsubr: |
42030fb2 DH |
4300 | case scm_tc7_cxr: |
4301 | case scm_tc7_subr_1: | |
ab1f1094 | 4302 | scm_wrong_num_args (proc); |
42030fb2 | 4303 | default: |
9b07e212 | 4304 | goto badfun; |
42030fb2 DH |
4305 | } |
4306 | } | |
0f2d19dd JB |
4307 | } |
4308 | #ifdef DEVAL | |
6dbd0af5 | 4309 | exit: |
5132eef0 | 4310 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4311 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4312 | { |
b7ff98dd MD |
4313 | SCM_CLEAR_TRACED_FRAME (debug); |
4314 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4315 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4316 | else |
4317 | { | |
5f144b10 GH |
4318 | int first; |
4319 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4320 | |
5f144b10 | 4321 | if (first) |
dff98306 | 4322 | arg1 = val; |
5f144b10 | 4323 | else |
6dbd0af5 | 4324 | { |
5f144b10 | 4325 | proc = val; |
6dbd0af5 MD |
4326 | goto ret; |
4327 | } | |
4328 | } | |
d95c0b76 | 4329 | SCM_TRAPS_P = 0; |
dff98306 | 4330 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4331 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4332 | } |
4333 | ret: | |
1646d37b | 4334 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4335 | return proc; |
4336 | #endif | |
4337 | } | |
4338 | ||
6dbd0af5 MD |
4339 | |
4340 | /* SECTION: This code is compiled once. | |
4341 | */ | |
4342 | ||
0f2d19dd JB |
4343 | #ifndef DEVAL |
4344 | ||
fdc28395 | 4345 | \f |
d0b07b5d | 4346 | |
fdc28395 KN |
4347 | /* Simple procedure calls |
4348 | */ | |
4349 | ||
4350 | SCM | |
4351 | scm_call_0 (SCM proc) | |
4352 | { | |
4353 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4354 | } | |
4355 | ||
4356 | SCM | |
4357 | scm_call_1 (SCM proc, SCM arg1) | |
4358 | { | |
4359 | return scm_apply (proc, arg1, scm_listofnull); | |
4360 | } | |
4361 | ||
4362 | SCM | |
4363 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4364 | { | |
4365 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4366 | } | |
4367 | ||
4368 | SCM | |
4369 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4370 | { | |
4371 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4372 | } | |
4373 | ||
d95c0b76 NJ |
4374 | SCM |
4375 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4376 | { | |
4377 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4378 | scm_cons (arg4, scm_listofnull))); | |
4379 | } | |
4380 | ||
fdc28395 KN |
4381 | /* Simple procedure applies |
4382 | */ | |
4383 | ||
4384 | SCM | |
4385 | scm_apply_0 (SCM proc, SCM args) | |
4386 | { | |
4387 | return scm_apply (proc, args, SCM_EOL); | |
4388 | } | |
4389 | ||
4390 | SCM | |
4391 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4392 | { | |
4393 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4394 | } | |
4395 | ||
4396 | SCM | |
4397 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4398 | { | |
4399 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4400 | } | |
4401 | ||
4402 | SCM | |
4403 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4404 | { | |
4405 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4406 | SCM_EOL); | |
4407 | } | |
4408 | ||
82a2622a | 4409 | /* This code processes the arguments to apply: |
b145c172 JB |
4410 | |
4411 | (apply PROC ARG1 ... ARGS) | |
4412 | ||
82a2622a JB |
4413 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4414 | ... arguments onto the front of ARGS, and returns the resulting | |
4415 | list. Note that ARGS is a list; thus, the argument to this | |
4416 | function is a list whose last element is a list. | |
4417 | ||
4418 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4419 | result. apply:nconc2last takes care of building the list of |
4420 | arguments, given (ARG1 ... ARGS). | |
4421 | ||
82a2622a JB |
4422 | Rather than do new consing, apply:nconc2last destroys its argument. |
4423 | On that topic, this code came into my care with the following | |
4424 | beautifully cryptic comment on that topic: "This will only screw | |
4425 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4426 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4427 | |
3b3b36dd | 4428 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4429 | (SCM lst), |
4430 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4431 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4432 | "@var{args}, and returns the resulting list. Note that\n" | |
4433 | "@var{args} is a list; thus, the argument to this function is\n" | |
4434 | "a list whose last element is a list.\n" | |
4435 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4436 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4437 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4438 | { |
4439 | SCM *lloc; | |
34d19ef6 | 4440 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4441 | lloc = &lst; |
c96d76b8 NJ |
4442 | while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be |
4443 | SCM_NULL_OR_NIL_P, but not | |
4444 | needed in 99.99% of cases, | |
4445 | and it could seriously hurt | |
4446 | performance. - Neil */ | |
a23afe53 | 4447 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4448 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4449 | *lloc = SCM_CAR (*lloc); |
4450 | return lst; | |
4451 | } | |
1bbd0b84 | 4452 | #undef FUNC_NAME |
0f2d19dd JB |
4453 | |
4454 | #endif /* !DEVAL */ | |
4455 | ||
6dbd0af5 MD |
4456 | |
4457 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4458 | * It is compiled twice. | |
4459 | */ | |
4460 | ||
0f2d19dd | 4461 | #if 0 |
0f2d19dd | 4462 | SCM |
6e8d25a6 | 4463 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4464 | {} |
4465 | #endif | |
4466 | ||
4467 | #if 0 | |
0f2d19dd | 4468 | SCM |
6e8d25a6 | 4469 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4470 | {} |
0f2d19dd JB |
4471 | #endif |
4472 | ||
1cc91f1b | 4473 | |
82a2622a JB |
4474 | /* Apply a function to a list of arguments. |
4475 | ||
4476 | This function is exported to the Scheme level as taking two | |
4477 | required arguments and a tail argument, as if it were: | |
4478 | (lambda (proc arg1 . args) ...) | |
4479 | Thus, if you just have a list of arguments to pass to a procedure, | |
4480 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4481 | args, pass the first as ARG1, then cons any remaining fixed args | |
4482 | onto the front of your argument list, and pass that as ARGS. */ | |
4483 | ||
0f2d19dd | 4484 | SCM |
1bbd0b84 | 4485 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4486 | { |
0f2d19dd | 4487 | #ifdef DEVAL |
92c2555f MV |
4488 | scm_t_debug_frame debug; |
4489 | scm_t_debug_info debug_vect_body; | |
1646d37b | 4490 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 4491 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4492 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4493 | debug.vect[0].a.proc = proc; |
4494 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 4495 | scm_last_debug_frame = &debug; |
0f2d19dd | 4496 | #else |
434f2f7a | 4497 | if (scm_debug_mode_p) |
0f2d19dd | 4498 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4499 | #endif |
4500 | ||
4501 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4502 | |
4503 | /* If ARGS is the empty list, then we're calling apply with only two | |
4504 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4505 | the case, futz with things so that ARG1 is the first argument to | |
4506 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4507 | rest. |
4508 | ||
4509 | Setting the debug apply frame args this way is pretty messy. | |
4510 | Perhaps we should store arg1 and args directly in the frame as | |
4511 | received, and let scm_frame_arguments unpack them, because that's | |
4512 | a relatively rare operation. This works for now; if the Guile | |
4513 | developer archives are still around, see Mikael's post of | |
4514 | 11-Apr-97. */ | |
0f2d19dd JB |
4515 | if (SCM_NULLP (args)) |
4516 | { | |
4517 | if (SCM_NULLP (arg1)) | |
30000774 JB |
4518 | { |
4519 | arg1 = SCM_UNDEFINED; | |
4520 | #ifdef DEVAL | |
4521 | debug.vect[0].a.args = SCM_EOL; | |
4522 | #endif | |
4523 | } | |
0f2d19dd JB |
4524 | else |
4525 | { | |
30000774 JB |
4526 | #ifdef DEVAL |
4527 | debug.vect[0].a.args = arg1; | |
4528 | #endif | |
0f2d19dd JB |
4529 | args = SCM_CDR (arg1); |
4530 | arg1 = SCM_CAR (arg1); | |
4531 | } | |
4532 | } | |
4533 | else | |
4534 | { | |
0f2d19dd | 4535 | args = scm_nconc2last (args); |
30000774 JB |
4536 | #ifdef DEVAL |
4537 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4538 | #endif | |
0f2d19dd | 4539 | } |
0f2d19dd | 4540 | #ifdef DEVAL |
b6d75948 | 4541 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4542 | { |
4543 | SCM tmp; | |
b7ff98dd | 4544 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4545 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4546 | else |
4547 | { | |
5f144b10 GH |
4548 | int first; |
4549 | ||
4550 | tmp = scm_make_continuation (&first); | |
4551 | if (!first) | |
6dbd0af5 MD |
4552 | goto entap; |
4553 | } | |
d95c0b76 NJ |
4554 | SCM_TRAPS_P = 0; |
4555 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4556 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4557 | } |
4558 | entap: | |
4559 | ENTER_APPLY; | |
4560 | #endif | |
6dbd0af5 | 4561 | tail: |
0f2d19dd JB |
4562 | switch (SCM_TYP7 (proc)) |
4563 | { | |
4564 | case scm_tc7_subr_2o: | |
4565 | args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args); | |
ddea3325 | 4566 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4567 | case scm_tc7_subr_2: |
ab1f1094 DH |
4568 | if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args))) |
4569 | scm_wrong_num_args (proc); | |
0f2d19dd | 4570 | args = SCM_CAR (args); |
ddea3325 | 4571 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4572 | case scm_tc7_subr_0: |
ab1f1094 DH |
4573 | if (!SCM_UNBNDP (arg1)) |
4574 | scm_wrong_num_args (proc); | |
4575 | else | |
4576 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4577 | case scm_tc7_subr_1: |
ab1f1094 DH |
4578 | if (SCM_UNBNDP (arg1)) |
4579 | scm_wrong_num_args (proc); | |
0f2d19dd | 4580 | case scm_tc7_subr_1o: |
ab1f1094 DH |
4581 | if (!SCM_NULLP (args)) |
4582 | scm_wrong_num_args (proc); | |
4583 | else | |
4584 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
4585 | case scm_tc7_dsubr: |
4586 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) | |
4587 | scm_wrong_num_args (proc); | |
4588 | if (SCM_INUMP (arg1)) | |
4589 | { | |
4590 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4591 | } | |
4592 | else if (SCM_REALP (arg1)) | |
4593 | { | |
4594 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4595 | } | |
4596 | else if (SCM_BIGP (arg1)) | |
f92e85f7 MV |
4597 | { |
4598 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4599 | } | |
4600 | else if (SCM_FRACTIONP (arg1)) | |
4601 | { | |
4602 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4603 | } | |
14b18ed6 DH |
4604 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4605 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
0f2d19dd | 4606 | case scm_tc7_cxr: |
ab1f1094 DH |
4607 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) |
4608 | scm_wrong_num_args (proc); | |
0f2d19dd | 4609 | { |
14b18ed6 DH |
4610 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4611 | do | |
4612 | { | |
4613 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4614 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4615 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4616 | pattern >>= 2; | |
4617 | } while (pattern); | |
4618 | RETURN (arg1); | |
0f2d19dd JB |
4619 | } |
4620 | case scm_tc7_subr_3: | |
ab1f1094 DH |
4621 | if (SCM_NULLP (args) |
4622 | || SCM_NULLP (SCM_CDR (args)) | |
4623 | || !SCM_NULLP (SCM_CDDR (args))) | |
4624 | scm_wrong_num_args (proc); | |
4625 | else | |
4626 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4627 | case scm_tc7_lsubr: |
4628 | #ifdef DEVAL | |
ddea3325 | 4629 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4630 | #else |
ddea3325 | 4631 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4632 | #endif |
4633 | case scm_tc7_lsubr_2: | |
ab1f1094 DH |
4634 | if (!SCM_CONSP (args)) |
4635 | scm_wrong_num_args (proc); | |
4636 | else | |
4637 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd JB |
4638 | case scm_tc7_asubr: |
4639 | if (SCM_NULLP (args)) | |
ddea3325 | 4640 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4641 | while (SCM_NIMP (args)) |
4642 | { | |
4643 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4644 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); | |
4645 | args = SCM_CDR (args); | |
4646 | } | |
4647 | RETURN (arg1); | |
4648 | case scm_tc7_rpsubr: | |
4649 | if (SCM_NULLP (args)) | |
4650 | RETURN (SCM_BOOL_T); | |
4651 | while (SCM_NIMP (args)) | |
4652 | { | |
4653 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4654 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) | |
4655 | RETURN (SCM_BOOL_F); | |
4656 | arg1 = SCM_CAR (args); | |
4657 | args = SCM_CDR (args); | |
4658 | } | |
4659 | RETURN (SCM_BOOL_T); | |
4660 | case scm_tcs_closures: | |
4661 | #ifdef DEVAL | |
6dbd0af5 | 4662 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4663 | #else |
4664 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4665 | #endif | |
726d810a | 4666 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4667 | scm_wrong_num_args (proc); |
1609038c MD |
4668 | |
4669 | /* Copy argument list */ | |
4670 | if (SCM_IMP (arg1)) | |
4671 | args = arg1; | |
4672 | else | |
4673 | { | |
4674 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
05b15362 | 4675 | for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4676 | { |
05b15362 | 4677 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4678 | tl = SCM_CDR (tl); |
4679 | } | |
4680 | SCM_SETCDR (tl, arg1); | |
4681 | } | |
4682 | ||
821f18a4 DH |
4683 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4684 | args, | |
4685 | SCM_ENV (proc)); | |
f9450cdb | 4686 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4687 | again: |
05b15362 DH |
4688 | arg1 = SCM_CDR (proc); |
4689 | while (!SCM_NULLP (arg1)) | |
2ddb0920 MD |
4690 | { |
4691 | if (SCM_IMP (SCM_CAR (proc))) | |
4692 | { | |
4693 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4694 | { | |
28d52ebb | 4695 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4696 | /* check for race condition */ |
4697 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4698 | m_expand_body (proc, args); |
28d52ebb | 4699 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4700 | goto again; |
2ddb0920 | 4701 | } |
5280aaca | 4702 | else |
17fa3fcf | 4703 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4704 | } |
4705 | else | |
b1cb24ff | 4706 | (void) EVAL (SCM_CAR (proc), args); |
e791c18f | 4707 | proc = arg1; |
05b15362 | 4708 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4709 | } |
e791c18f | 4710 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4711 | case scm_tc7_smob: |
68b06924 | 4712 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4713 | goto badproc; |
afa38f6e | 4714 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4715 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
afa38f6e | 4716 | else if (SCM_NULLP (args)) |
ddea3325 | 4717 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
0717dfd8 | 4718 | else if (SCM_NULLP (SCM_CDR (args))) |
ddea3325 | 4719 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4720 | else |
68b06924 | 4721 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4722 | case scm_tc7_cclo: |
4723 | #ifdef DEVAL | |
6dbd0af5 MD |
4724 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4725 | arg1 = proc; | |
4726 | proc = SCM_CCLO_SUBR (proc); | |
4727 | debug.vect[0].a.proc = proc; | |
4728 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4729 | #else |
4730 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4731 | arg1 = proc; |
4732 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4733 | #endif |
0f2d19dd | 4734 | goto tail; |
89efbff4 MD |
4735 | case scm_tc7_pws: |
4736 | proc = SCM_PROCEDURE (proc); | |
4737 | #ifdef DEVAL | |
4738 | debug.vect[0].a.proc = proc; | |
4739 | #endif | |
4740 | goto tail; | |
904a077d | 4741 | case scm_tcs_struct: |
f3d2630a MD |
4742 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4743 | { | |
4744 | #ifdef DEVAL | |
4745 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4746 | #else | |
4747 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4748 | #endif | |
195847fa | 4749 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4750 | } |
2ca0d207 | 4751 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4752 | { |
504d99c5 | 4753 | /* operator */ |
da7f71d7 MD |
4754 | #ifdef DEVAL |
4755 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4756 | #else | |
4757 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4758 | #endif | |
4759 | arg1 = proc; | |
195847fa MD |
4760 | proc = (SCM_I_ENTITYP (proc) |
4761 | ? SCM_ENTITY_PROCEDURE (proc) | |
4762 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4763 | #ifdef DEVAL |
4764 | debug.vect[0].a.proc = proc; | |
4765 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4766 | #endif | |
195847fa MD |
4767 | if (SCM_NIMP (proc)) |
4768 | goto tail; | |
4769 | else | |
4770 | goto badproc; | |
da7f71d7 | 4771 | } |
2ca0d207 DH |
4772 | else |
4773 | goto badproc; | |
0f2d19dd JB |
4774 | default: |
4775 | badproc: | |
db4b4ca6 | 4776 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
4777 | } |
4778 | #ifdef DEVAL | |
6dbd0af5 | 4779 | exit: |
5132eef0 | 4780 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4781 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4782 | { |
b7ff98dd MD |
4783 | SCM_CLEAR_TRACED_FRAME (debug); |
4784 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 4785 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4786 | else |
4787 | { | |
5f144b10 GH |
4788 | int first; |
4789 | SCM val = scm_make_continuation (&first); | |
4790 | ||
4791 | if (first) | |
4792 | arg1 = val; | |
4793 | else | |
6dbd0af5 | 4794 | { |
5f144b10 | 4795 | proc = val; |
6dbd0af5 MD |
4796 | goto ret; |
4797 | } | |
4798 | } | |
d95c0b76 NJ |
4799 | SCM_TRAPS_P = 0; |
4800 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
4801 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4802 | } |
4803 | ret: | |
1646d37b | 4804 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4805 | return proc; |
4806 | #endif | |
4807 | } | |
4808 | ||
6dbd0af5 MD |
4809 | |
4810 | /* SECTION: The rest of this file is only read once. | |
4811 | */ | |
4812 | ||
0f2d19dd JB |
4813 | #ifndef DEVAL |
4814 | ||
504d99c5 MD |
4815 | /* Trampolines |
4816 | * | |
4817 | * Trampolines make it possible to move procedure application dispatch | |
4818 | * outside inner loops. The motivation was clean implementation of | |
4819 | * efficient replacements of R5RS primitives in SRFI-1. | |
4820 | * | |
4821 | * The semantics is clear: scm_trampoline_N returns an optimized | |
4822 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
4823 | * on N args). | |
4824 | * | |
4825 | * Applying the optimization to map and for-each increased efficiency | |
4826 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
4827 | * before. | |
4828 | */ | |
4829 | ||
756414cf MD |
4830 | static SCM |
4831 | call_subr0_0 (SCM proc) | |
4832 | { | |
4833 | return SCM_SUBRF (proc) (); | |
4834 | } | |
4835 | ||
4836 | static SCM | |
4837 | call_subr1o_0 (SCM proc) | |
4838 | { | |
4839 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
4840 | } | |
4841 | ||
4842 | static SCM | |
4843 | call_lsubr_0 (SCM proc) | |
4844 | { | |
4845 | return SCM_SUBRF (proc) (SCM_EOL); | |
4846 | } | |
4847 | ||
4848 | SCM | |
4849 | scm_i_call_closure_0 (SCM proc) | |
4850 | { | |
6a3f13f0 DH |
4851 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4852 | SCM_EOL, | |
4853 | SCM_ENV (proc)); | |
4854 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4855 | return result; |
756414cf MD |
4856 | } |
4857 | ||
4858 | scm_t_trampoline_0 | |
4859 | scm_trampoline_0 (SCM proc) | |
4860 | { | |
2510c810 DH |
4861 | scm_t_trampoline_0 trampoline; |
4862 | ||
756414cf | 4863 | if (SCM_IMP (proc)) |
d0b07b5d | 4864 | return NULL; |
2510c810 | 4865 | |
756414cf MD |
4866 | switch (SCM_TYP7 (proc)) |
4867 | { | |
4868 | case scm_tc7_subr_0: | |
2510c810 DH |
4869 | trampoline = call_subr0_0; |
4870 | break; | |
756414cf | 4871 | case scm_tc7_subr_1o: |
2510c810 DH |
4872 | trampoline = call_subr1o_0; |
4873 | break; | |
756414cf | 4874 | case scm_tc7_lsubr: |
2510c810 DH |
4875 | trampoline = call_lsubr_0; |
4876 | break; | |
756414cf MD |
4877 | case scm_tcs_closures: |
4878 | { | |
4879 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b | 4880 | if (SCM_NULLP (formals) || !SCM_CONSP (formals)) |
2510c810 | 4881 | trampoline = scm_i_call_closure_0; |
756414cf | 4882 | else |
d0b07b5d | 4883 | return NULL; |
2510c810 | 4884 | break; |
756414cf MD |
4885 | } |
4886 | case scm_tcs_struct: | |
4887 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4888 | trampoline = scm_call_generic_0; |
2ca0d207 | 4889 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4890 | trampoline = scm_call_0; |
4891 | else | |
4892 | return NULL; | |
4893 | break; | |
756414cf MD |
4894 | case scm_tc7_smob: |
4895 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4896 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 4897 | else |
d0b07b5d | 4898 | return NULL; |
2510c810 | 4899 | break; |
756414cf MD |
4900 | case scm_tc7_asubr: |
4901 | case scm_tc7_rpsubr: | |
4902 | case scm_tc7_cclo: | |
4903 | case scm_tc7_pws: | |
2510c810 DH |
4904 | trampoline = scm_call_0; |
4905 | break; | |
756414cf | 4906 | default: |
2510c810 | 4907 | return NULL; /* not applicable on zero arguments */ |
756414cf | 4908 | } |
2510c810 DH |
4909 | /* We only reach this point if a valid trampoline was determined. */ |
4910 | ||
4911 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4912 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
434f2f7a | 4913 | if (scm_debug_mode_p) |
2510c810 DH |
4914 | return scm_call_0; |
4915 | else | |
4916 | return trampoline; | |
756414cf MD |
4917 | } |
4918 | ||
504d99c5 MD |
4919 | static SCM |
4920 | call_subr1_1 (SCM proc, SCM arg1) | |
4921 | { | |
4922 | return SCM_SUBRF (proc) (arg1); | |
4923 | } | |
4924 | ||
9ed24633 MD |
4925 | static SCM |
4926 | call_subr2o_1 (SCM proc, SCM arg1) | |
4927 | { | |
4928 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
4929 | } | |
4930 | ||
504d99c5 MD |
4931 | static SCM |
4932 | call_lsubr_1 (SCM proc, SCM arg1) | |
4933 | { | |
4934 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
4935 | } | |
4936 | ||
4937 | static SCM | |
4938 | call_dsubr_1 (SCM proc, SCM arg1) | |
4939 | { | |
4940 | if (SCM_INUMP (arg1)) | |
4941 | { | |
4942 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4943 | } | |
4944 | else if (SCM_REALP (arg1)) | |
4945 | { | |
4946 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4947 | } | |
504d99c5 | 4948 | else if (SCM_BIGP (arg1)) |
f92e85f7 MV |
4949 | { |
4950 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4951 | } | |
4952 | else if (SCM_FRACTIONP (arg1)) | |
4953 | { | |
4954 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4955 | } | |
504d99c5 MD |
4956 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4957 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4958 | } | |
4959 | ||
4960 | static SCM | |
4961 | call_cxr_1 (SCM proc, SCM arg1) | |
4962 | { | |
14b18ed6 DH |
4963 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4964 | do | |
4965 | { | |
4966 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4967 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4968 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4969 | pattern >>= 2; | |
4970 | } while (pattern); | |
4971 | return arg1; | |
504d99c5 MD |
4972 | } |
4973 | ||
4974 | static SCM | |
4975 | call_closure_1 (SCM proc, SCM arg1) | |
4976 | { | |
6a3f13f0 DH |
4977 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4978 | scm_list_1 (arg1), | |
4979 | SCM_ENV (proc)); | |
4980 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4981 | return result; |
504d99c5 MD |
4982 | } |
4983 | ||
4984 | scm_t_trampoline_1 | |
4985 | scm_trampoline_1 (SCM proc) | |
4986 | { | |
2510c810 DH |
4987 | scm_t_trampoline_1 trampoline; |
4988 | ||
504d99c5 | 4989 | if (SCM_IMP (proc)) |
d0b07b5d | 4990 | return NULL; |
2510c810 | 4991 | |
504d99c5 MD |
4992 | switch (SCM_TYP7 (proc)) |
4993 | { | |
4994 | case scm_tc7_subr_1: | |
4995 | case scm_tc7_subr_1o: | |
2510c810 DH |
4996 | trampoline = call_subr1_1; |
4997 | break; | |
9ed24633 | 4998 | case scm_tc7_subr_2o: |
2510c810 DH |
4999 | trampoline = call_subr2o_1; |
5000 | break; | |
504d99c5 | 5001 | case scm_tc7_lsubr: |
2510c810 DH |
5002 | trampoline = call_lsubr_1; |
5003 | break; | |
14b18ed6 | 5004 | case scm_tc7_dsubr: |
2510c810 DH |
5005 | trampoline = call_dsubr_1; |
5006 | break; | |
504d99c5 | 5007 | case scm_tc7_cxr: |
2510c810 DH |
5008 | trampoline = call_cxr_1; |
5009 | break; | |
504d99c5 MD |
5010 | case scm_tcs_closures: |
5011 | { | |
5012 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
5013 | if (!SCM_NULLP (formals) |
5014 | && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals)))) | |
2510c810 | 5015 | trampoline = call_closure_1; |
504d99c5 | 5016 | else |
d0b07b5d | 5017 | return NULL; |
2510c810 | 5018 | break; |
504d99c5 MD |
5019 | } |
5020 | case scm_tcs_struct: | |
5021 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5022 | trampoline = scm_call_generic_1; |
2ca0d207 | 5023 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5024 | trampoline = scm_call_1; |
5025 | else | |
5026 | return NULL; | |
5027 | break; | |
504d99c5 MD |
5028 | case scm_tc7_smob: |
5029 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5030 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 5031 | else |
d0b07b5d | 5032 | return NULL; |
2510c810 | 5033 | break; |
504d99c5 MD |
5034 | case scm_tc7_asubr: |
5035 | case scm_tc7_rpsubr: | |
5036 | case scm_tc7_cclo: | |
5037 | case scm_tc7_pws: | |
2510c810 DH |
5038 | trampoline = scm_call_1; |
5039 | break; | |
504d99c5 | 5040 | default: |
d0b07b5d | 5041 | return NULL; /* not applicable on one arg */ |
504d99c5 | 5042 | } |
2510c810 DH |
5043 | /* We only reach this point if a valid trampoline was determined. */ |
5044 | ||
5045 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5046 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
434f2f7a | 5047 | if (scm_debug_mode_p) |
2510c810 DH |
5048 | return scm_call_1; |
5049 | else | |
5050 | return trampoline; | |
504d99c5 MD |
5051 | } |
5052 | ||
5053 | static SCM | |
5054 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5055 | { | |
5056 | return SCM_SUBRF (proc) (arg1, arg2); | |
5057 | } | |
5058 | ||
9ed24633 MD |
5059 | static SCM |
5060 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5061 | { | |
5062 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
5063 | } | |
5064 | ||
504d99c5 MD |
5065 | static SCM |
5066 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
5067 | { | |
5068 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
5069 | } | |
5070 | ||
5071 | static SCM | |
5072 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
5073 | { | |
6a3f13f0 DH |
5074 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5075 | scm_list_2 (arg1, arg2), | |
5076 | SCM_ENV (proc)); | |
5077 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5078 | return result; |
504d99c5 MD |
5079 | } |
5080 | ||
5081 | scm_t_trampoline_2 | |
5082 | scm_trampoline_2 (SCM proc) | |
5083 | { | |
2510c810 DH |
5084 | scm_t_trampoline_2 trampoline; |
5085 | ||
504d99c5 | 5086 | if (SCM_IMP (proc)) |
d0b07b5d | 5087 | return NULL; |
2510c810 | 5088 | |
504d99c5 MD |
5089 | switch (SCM_TYP7 (proc)) |
5090 | { | |
5091 | case scm_tc7_subr_2: | |
5092 | case scm_tc7_subr_2o: | |
5093 | case scm_tc7_rpsubr: | |
5094 | case scm_tc7_asubr: | |
2510c810 DH |
5095 | trampoline = call_subr2_2; |
5096 | break; | |
9ed24633 | 5097 | case scm_tc7_lsubr_2: |
2510c810 DH |
5098 | trampoline = call_lsubr2_2; |
5099 | break; | |
504d99c5 | 5100 | case scm_tc7_lsubr: |
2510c810 DH |
5101 | trampoline = call_lsubr_2; |
5102 | break; | |
504d99c5 MD |
5103 | case scm_tcs_closures: |
5104 | { | |
5105 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
5106 | if (!SCM_NULLP (formals) |
5107 | && (!SCM_CONSP (formals) | |
5108 | || (!SCM_NULLP (SCM_CDR (formals)) | |
5109 | && (!SCM_CONSP (SCM_CDR (formals)) | |
5110 | || !SCM_CONSP (SCM_CDDR (formals)))))) | |
2510c810 | 5111 | trampoline = call_closure_2; |
504d99c5 | 5112 | else |
d0b07b5d | 5113 | return NULL; |
2510c810 | 5114 | break; |
504d99c5 MD |
5115 | } |
5116 | case scm_tcs_struct: | |
5117 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5118 | trampoline = scm_call_generic_2; |
2ca0d207 | 5119 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5120 | trampoline = scm_call_2; |
5121 | else | |
5122 | return NULL; | |
5123 | break; | |
504d99c5 MD |
5124 | case scm_tc7_smob: |
5125 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5126 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5127 | else |
d0b07b5d | 5128 | return NULL; |
2510c810 | 5129 | break; |
504d99c5 MD |
5130 | case scm_tc7_cclo: |
5131 | case scm_tc7_pws: | |
2510c810 DH |
5132 | trampoline = scm_call_2; |
5133 | break; | |
504d99c5 | 5134 | default: |
d0b07b5d | 5135 | return NULL; /* not applicable on two args */ |
504d99c5 | 5136 | } |
2510c810 DH |
5137 | /* We only reach this point if a valid trampoline was determined. */ |
5138 | ||
5139 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5140 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
434f2f7a | 5141 | if (scm_debug_mode_p) |
2510c810 DH |
5142 | return scm_call_2; |
5143 | else | |
5144 | return trampoline; | |
504d99c5 MD |
5145 | } |
5146 | ||
d9c393f5 JB |
5147 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5148 | ||
47c3f06d | 5149 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5150 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5151 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5152 | static inline void |
47c3f06d | 5153 | check_map_args (SCM argv, |
c014a02e | 5154 | long len, |
47c3f06d MD |
5155 | SCM gf, |
5156 | SCM proc, | |
5157 | SCM args, | |
5158 | const char *who) | |
d9c393f5 | 5159 | { |
34d19ef6 | 5160 | SCM const *ve = SCM_VELTS (argv); |
c014a02e | 5161 | long i; |
d9c393f5 | 5162 | |
b5c2579a | 5163 | for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5164 | { |
c014a02e | 5165 | long elt_len = scm_ilength (ve[i]); |
d9c393f5 JB |
5166 | |
5167 | if (elt_len < 0) | |
47c3f06d MD |
5168 | { |
5169 | if (gf) | |
5170 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5171 | else | |
5172 | scm_wrong_type_arg (who, i + 2, ve[i]); | |
5173 | } | |
d9c393f5 JB |
5174 | |
5175 | if (elt_len != len) | |
504d99c5 | 5176 | scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2)); |
d9c393f5 JB |
5177 | } |
5178 | ||
5d2b97cd | 5179 | scm_remember_upto_here_1 (argv); |
d9c393f5 JB |
5180 | } |
5181 | ||
5182 | ||
47c3f06d | 5183 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5184 | |
368bf056 MD |
5185 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5186 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5187 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5188 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5189 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5190 | */ |
5191 | ||
0f2d19dd | 5192 | SCM |
1bbd0b84 | 5193 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5194 | #define FUNC_NAME s_map |
0f2d19dd | 5195 | { |
c014a02e | 5196 | long i, len; |
0f2d19dd JB |
5197 | SCM res = SCM_EOL; |
5198 | SCM *pres = &res; | |
34d19ef6 | 5199 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
0f2d19dd | 5200 | |
d9c393f5 | 5201 | len = scm_ilength (arg1); |
47c3f06d MD |
5202 | SCM_GASSERTn (len >= 0, |
5203 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5204 | SCM_VALIDATE_REST_ARGUMENT (args); |
0f2d19dd JB |
5205 | if (SCM_NULLP (args)) |
5206 | { | |
504d99c5 MD |
5207 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5208 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5209 | while (SCM_NIMP (arg1)) | |
5210 | { | |
5211 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5212 | pres = SCM_CDRLOC (*pres); | |
5213 | arg1 = SCM_CDR (arg1); | |
5214 | } | |
5215 | return res; | |
5216 | } | |
5217 | if (SCM_NULLP (SCM_CDR (args))) | |
5218 | { | |
5219 | SCM arg2 = SCM_CAR (args); | |
5220 | int len2 = scm_ilength (arg2); | |
5221 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5222 | SCM_GASSERTn (call, | |
5223 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5224 | SCM_GASSERTn (len2 >= 0, | |
5225 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5226 | if (len2 != len) | |
5227 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5228 | while (SCM_NIMP (arg1)) |
5229 | { | |
504d99c5 | 5230 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5231 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5232 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5233 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5234 | } |
5235 | return res; | |
5236 | } | |
05b15362 DH |
5237 | arg1 = scm_cons (arg1, args); |
5238 | args = scm_vector (arg1); | |
0f2d19dd | 5239 | ve = SCM_VELTS (args); |
47c3f06d | 5240 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5241 | while (1) |
5242 | { | |
5243 | arg1 = SCM_EOL; | |
b5c2579a | 5244 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5245 | { |
d9c393f5 JB |
5246 | if (SCM_IMP (ve[i])) |
5247 | return res; | |
0f2d19dd | 5248 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5249 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd | 5250 | } |
8ea46249 | 5251 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5252 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5253 | } |
5254 | } | |
af45e3b0 | 5255 | #undef FUNC_NAME |
0f2d19dd JB |
5256 | |
5257 | ||
47c3f06d | 5258 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5259 | |
0f2d19dd | 5260 | SCM |
1bbd0b84 | 5261 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5262 | #define FUNC_NAME s_for_each |
0f2d19dd | 5263 | { |
34d19ef6 | 5264 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
c014a02e | 5265 | long i, len; |
d9c393f5 | 5266 | len = scm_ilength (arg1); |
47c3f06d MD |
5267 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5268 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5269 | SCM_VALIDATE_REST_ARGUMENT (args); |
c96d76b8 | 5270 | if (SCM_NULLP (args)) |
0f2d19dd | 5271 | { |
504d99c5 MD |
5272 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5273 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5274 | while (SCM_NIMP (arg1)) | |
5275 | { | |
5276 | call (proc, SCM_CAR (arg1)); | |
5277 | arg1 = SCM_CDR (arg1); | |
5278 | } | |
5279 | return SCM_UNSPECIFIED; | |
5280 | } | |
5281 | if (SCM_NULLP (SCM_CDR (args))) | |
5282 | { | |
5283 | SCM arg2 = SCM_CAR (args); | |
5284 | int len2 = scm_ilength (arg2); | |
5285 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5286 | SCM_GASSERTn (call, g_for_each, | |
5287 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5288 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5289 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5290 | if (len2 != len) | |
5291 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5292 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5293 | { |
504d99c5 | 5294 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5295 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5296 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5297 | } |
5298 | return SCM_UNSPECIFIED; | |
5299 | } | |
05b15362 DH |
5300 | arg1 = scm_cons (arg1, args); |
5301 | args = scm_vector (arg1); | |
0f2d19dd | 5302 | ve = SCM_VELTS (args); |
47c3f06d | 5303 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5304 | while (1) |
5305 | { | |
5306 | arg1 = SCM_EOL; | |
b5c2579a | 5307 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5308 | { |
c96d76b8 NJ |
5309 | if (SCM_IMP (ve[i])) |
5310 | return SCM_UNSPECIFIED; | |
0f2d19dd | 5311 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5312 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd JB |
5313 | } |
5314 | scm_apply (proc, arg1, SCM_EOL); | |
5315 | } | |
5316 | } | |
af45e3b0 | 5317 | #undef FUNC_NAME |
0f2d19dd | 5318 | |
1cc91f1b | 5319 | |
0f2d19dd | 5320 | SCM |
6e8d25a6 | 5321 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5322 | { |
16d4699b MV |
5323 | SCM z; |
5324 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5325 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5326 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5327 | return z; |
5328 | } | |
5329 | ||
5330 | ||
92c2555f | 5331 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5332 | |
0f2d19dd | 5333 | SCM |
6e8d25a6 | 5334 | scm_makprom (SCM code) |
0f2d19dd | 5335 | { |
28d52ebb MD |
5336 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5337 | SCM_UNPACK (code), | |
5338 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
5339 | } |
5340 | ||
28d52ebb MD |
5341 | static size_t |
5342 | promise_free (SCM promise) | |
5343 | { | |
5344 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
5345 | return 0; | |
5346 | } | |
1cc91f1b | 5347 | |
0f2d19dd | 5348 | static int |
e841c3e0 | 5349 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5350 | { |
19402679 | 5351 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5352 | scm_puts ("#<promise ", port); |
19402679 | 5353 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5354 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5355 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5356 | scm_putc ('>', port); |
0f2d19dd JB |
5357 | return !0; |
5358 | } | |
5359 | ||
3b3b36dd | 5360 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5361 | (SCM promise), |
67e8151b MG |
5362 | "If the promise @var{x} has not been computed yet, compute and\n" |
5363 | "return @var{x}, otherwise just return the previously computed\n" | |
5364 | "value.") | |
1bbd0b84 | 5365 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5366 | { |
28d52ebb MD |
5367 | SCM_VALIDATE_SMOB (1, promise, promise); |
5368 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
5369 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5370 | { |
28d52ebb MD |
5371 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5372 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5373 | { |
28d52ebb MD |
5374 | SCM_SET_PROMISE_DATA (promise, ans); |
5375 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5376 | } |
5377 | } | |
28d52ebb MD |
5378 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
5379 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 5380 | } |
1bbd0b84 | 5381 | #undef FUNC_NAME |
0f2d19dd | 5382 | |
445f675c | 5383 | |
a1ec6916 | 5384 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5385 | (SCM obj), |
b380b885 | 5386 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5387 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5388 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5389 | { |
67e8151b | 5390 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5391 | } |
1bbd0b84 | 5392 | #undef FUNC_NAME |
0f2d19dd | 5393 | |
445f675c | 5394 | |
a1ec6916 | 5395 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5396 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5397 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5398 | "Any source properties associated with @var{xorig} are also associated\n" | |
5399 | "with the new pair.") | |
1bbd0b84 | 5400 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5401 | { |
5402 | SCM p, z; | |
16d4699b | 5403 | z = scm_cons (x, y); |
26d5b9b4 MD |
5404 | /* Copy source properties possibly associated with xorig. */ |
5405 | p = scm_whash_lookup (scm_source_whash, xorig); | |
445f675c | 5406 | if (!SCM_IMP (p)) |
26d5b9b4 MD |
5407 | scm_whash_insert (scm_source_whash, z, p); |
5408 | return z; | |
5409 | } | |
1bbd0b84 | 5410 | #undef FUNC_NAME |
26d5b9b4 | 5411 | |
445f675c | 5412 | |
62360b89 DH |
5413 | /* The function scm_copy_tree is used to copy an expression tree to allow the |
5414 | * memoizer to modify the expression during memoization. scm_copy_tree | |
5415 | * creates deep copies of pairs and vectors, but not of any other data types, | |
5416 | * since only pairs and vectors will be parsed by the memoizer. | |
5417 | * | |
5418 | * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise | |
5419 | * pattern is used to detect cycles. In fact, the pattern is used in two | |
5420 | * dimensions, vertical (indicated in the code by the variable names 'hare' | |
5421 | * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both | |
5422 | * dimensions, the hare/rabbit will take two steps when the tortoise/turtle | |
5423 | * takes one. | |
5424 | * | |
5425 | * The vertical dimension corresponds to recursive calls to function | |
5426 | * copy_tree: This happens when descending into vector elements, into cars of | |
5427 | * lists and into the cdr of an improper list. In this dimension, the | |
5428 | * tortoise follows the hare by using the processor stack: Every stack frame | |
5429 | * will hold an instance of struct t_trace. These instances are connected in | |
5430 | * a way that represents the trace of the hare, which thus can be followed by | |
5431 | * the tortoise. The tortoise will always point to struct t_trace instances | |
5432 | * relating to SCM objects that have already been copied. Thus, a cycle is | |
5433 | * detected if the tortoise and the hare point to the same object, | |
5434 | * | |
5435 | * The horizontal dimension is within one execution of copy_tree, when the | |
5436 | * function cdr's along the pairs of a list. This is the standard | |
5437 | * hare-and-tortoise implementation, found several times in guile. */ | |
5438 | ||
5439 | struct t_trace { | |
5440 | struct t_trace *trace; // These pointers form a trace along the stack. | |
5441 | SCM obj; // The object handled at the respective stack frame. | |
5442 | }; | |
5443 | ||
5444 | static SCM | |
5445 | copy_tree ( | |
5446 | struct t_trace *const hare, | |
5447 | struct t_trace *tortoise, | |
5448 | unsigned int tortoise_delay ) | |
5449 | { | |
5450 | if (!SCM_CONSP (hare->obj) && !SCM_VECTORP (hare->obj)) | |
5451 | { | |
5452 | return hare->obj; | |
5453 | } | |
5454 | else | |
5455 | { | |
5456 | /* Prepare the trace along the stack. */ | |
5457 | struct t_trace new_hare; | |
5458 | hare->trace = &new_hare; | |
5459 | ||
5460 | /* The tortoise will make its step after the delay has elapsed. Note | |
5461 | * that in contrast to the typical hare-and-tortoise pattern, the step | |
5462 | * of the tortoise happens before the hare takes its steps. This is, in | |
5463 | * principle, no problem, except for the start of the algorithm: Then, | |
5fb64383 | 5464 | * it has to be made sure that the hare actually gets its advantage of |
62360b89 DH |
5465 | * two steps. */ |
5466 | if (tortoise_delay == 0) | |
5467 | { | |
5468 | tortoise_delay = 1; | |
5469 | tortoise = tortoise->trace; | |
5470 | ASSERT_SYNTAX (!SCM_EQ_P (hare->obj, tortoise->obj), | |
5471 | s_bad_expression, hare->obj); | |
5472 | } | |
5473 | else | |
5474 | { | |
5475 | --tortoise_delay; | |
5476 | } | |
5477 | ||
5478 | if (SCM_VECTORP (hare->obj)) | |
5479 | { | |
5480 | const unsigned long int length = SCM_VECTOR_LENGTH (hare->obj); | |
5481 | const SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED); | |
5482 | ||
5483 | /* Each vector element is copied by recursing into copy_tree, having | |
5484 | * the tortoise follow the hare into the depths of the stack. */ | |
5485 | unsigned long int i; | |
5486 | for (i = 0; i < length; ++i) | |
5487 | { | |
5488 | SCM new_element; | |
5489 | new_hare.obj = SCM_VECTOR_REF (hare->obj, i); | |
5490 | new_element = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5491 | SCM_VECTOR_SET (new_vector, i, new_element); | |
5492 | } | |
5493 | ||
5494 | return new_vector; | |
5495 | } | |
5496 | else // SCM_CONSP (hare->obj) | |
5497 | { | |
5498 | SCM result; | |
5499 | SCM tail; | |
5500 | ||
5501 | SCM rabbit = hare->obj; | |
5502 | SCM turtle = hare->obj; | |
5503 | ||
5504 | SCM copy; | |
5505 | ||
5506 | /* The first pair of the list is treated specially, in order to | |
5507 | * preserve a potential source code position. */ | |
5508 | result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL); | |
5509 | new_hare.obj = SCM_CAR (rabbit); | |
5510 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5511 | SCM_SETCAR (tail, copy); | |
5512 | ||
5513 | /* The remaining pairs of the list are copied by, horizontally, | |
5514 | * having the turtle follow the rabbit, and, vertically, having the | |
5515 | * tortoise follow the hare into the depths of the stack. */ | |
5516 | rabbit = SCM_CDR (rabbit); | |
5517 | while (SCM_CONSP (rabbit)) | |
5518 | { | |
5519 | new_hare.obj = SCM_CAR (rabbit); | |
5520 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5521 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5522 | tail = SCM_CDR (tail); | |
5523 | ||
5524 | rabbit = SCM_CDR (rabbit); | |
5525 | if (SCM_CONSP (rabbit)) | |
5526 | { | |
5527 | new_hare.obj = SCM_CAR (rabbit); | |
5528 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5529 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5530 | tail = SCM_CDR (tail); | |
5531 | rabbit = SCM_CDR (rabbit); | |
5532 | ||
5533 | turtle = SCM_CDR (turtle); | |
5534 | ASSERT_SYNTAX (!SCM_EQ_P (rabbit, turtle), | |
5535 | s_bad_expression, rabbit); | |
5536 | } | |
5537 | } | |
5538 | ||
5539 | /* We have to recurse into copy_tree again for the last cdr, in | |
5540 | * order to handle the situation that it holds a vector. */ | |
5541 | new_hare.obj = rabbit; | |
5542 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5543 | SCM_SETCDR (tail, copy); | |
5544 | ||
5545 | return result; | |
5546 | } | |
5547 | } | |
5548 | } | |
5549 | ||
a1ec6916 | 5550 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5551 | (SCM obj), |
b380b885 | 5552 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
bfefbf18 | 5553 | "the new data structure. @code{copy-tree} recurses down the\n" |
b380b885 MD |
5554 | "contents of both pairs and vectors (since both cons cells and vector\n" |
5555 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5556 | "any other object.") | |
1bbd0b84 | 5557 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd | 5558 | { |
62360b89 DH |
5559 | /* Prepare the trace along the stack. */ |
5560 | struct t_trace trace; | |
5561 | trace.obj = obj; | |
5562 | ||
5563 | /* In function copy_tree, if the tortoise makes its step, it will do this | |
5564 | * before the hare has the chance to move. Thus, we have to make sure that | |
5565 | * the very first step of the tortoise will not happen after the hare has | |
5566 | * really made two steps. This is achieved by passing '2' as the initial | |
5567 | * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare | |
5568 | * a bigger advantage may improve performance slightly. */ | |
5569 | return copy_tree (&trace, &trace, 2); | |
0f2d19dd | 5570 | } |
1bbd0b84 | 5571 | #undef FUNC_NAME |
0f2d19dd | 5572 | |
1cc91f1b | 5573 | |
4163eb72 MV |
5574 | /* We have three levels of EVAL here: |
5575 | ||
5576 | - scm_i_eval (exp, env) | |
5577 | ||
5578 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5579 | structure as used by the actual tree code evaluator. When ENV is | |
5580 | a top-level environment, then changes to the current module are | |
a513ead3 | 5581 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5582 | the current module. |
5583 | ||
5584 | - scm_primitive_eval (exp) | |
5585 | ||
5586 | evaluates EXP in the top-level environment as determined by the | |
5587 | current module. This is done by constructing a suitable | |
5588 | environment and calling scm_i_eval. Thus, changes to the | |
5589 | top-level module are tracked normally. | |
5590 | ||
5591 | - scm_eval (exp, mod) | |
5592 | ||
a513ead3 | 5593 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
5594 | setting the current module to MOD, invoking scm_primitive_eval on |
5595 | EXP, and then restoring the current module to the value it had | |
5596 | previously. That is, while EXP is evaluated, changes to the | |
5597 | current module are tracked, but these changes do not persist when | |
5598 | scm_eval returns. | |
5599 | ||
5600 | For each level of evals, there are two variants, distinguished by a | |
5601 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5602 | variant can destructively modify EXP into something completely | |
5603 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5604 | _x variants should not ever be used again for anything. So when in | |
5605 | doubt, use the ordinary variant. | |
5606 | ||
5607 | */ | |
5608 | ||
0f2d19dd | 5609 | SCM |
68d8be66 | 5610 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5611 | { |
434f2f7a DH |
5612 | if (SCM_SYMBOLP (exp)) |
5613 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); | |
5614 | else | |
5615 | return SCM_XEVAL (exp, env); | |
0f2d19dd JB |
5616 | } |
5617 | ||
68d8be66 MD |
5618 | SCM |
5619 | scm_i_eval (SCM exp, SCM env) | |
5620 | { | |
26fb6390 | 5621 | exp = scm_copy_tree (exp); |
434f2f7a DH |
5622 | if (SCM_SYMBOLP (exp)) |
5623 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); | |
5624 | else | |
5625 | return SCM_XEVAL (exp, env); | |
68d8be66 MD |
5626 | } |
5627 | ||
5628 | SCM | |
4163eb72 | 5629 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5630 | { |
a513ead3 | 5631 | SCM env; |
bcdab802 | 5632 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5633 | if (SCM_NIMP (transformer)) |
fdc28395 | 5634 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5635 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5636 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5637 | } |
5638 | ||
4163eb72 MV |
5639 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5640 | (SCM exp), | |
2069af38 | 5641 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5642 | "the current module.") |
5643 | #define FUNC_NAME s_scm_primitive_eval | |
5644 | { | |
a513ead3 | 5645 | SCM env; |
bcdab802 | 5646 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5647 | if (SCM_NIMP (transformer)) |
fdc28395 | 5648 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5649 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5650 | return scm_i_eval (exp, env); |
5651 | } | |
5652 | #undef FUNC_NAME | |
5653 | ||
6bff1368 | 5654 | |
68d8be66 MD |
5655 | /* Eval does not take the second arg optionally. This is intentional |
5656 | * in order to be R5RS compatible, and to prepare for the new module | |
5657 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5658 | * environment explicit. */ |
549e6ec6 | 5659 | |
09074dbf DH |
5660 | static void |
5661 | change_environment (void *data) | |
5662 | { | |
5663 | SCM pair = SCM_PACK (data); | |
5664 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 5665 | SCM old_module = scm_current_module (); |
09074dbf | 5666 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 5667 | scm_set_current_module (new_module); |
09074dbf DH |
5668 | } |
5669 | ||
09074dbf DH |
5670 | static void |
5671 | restore_environment (void *data) | |
5672 | { | |
5673 | SCM pair = SCM_PACK (data); | |
5674 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 5675 | SCM new_module = scm_current_module (); |
2e9c835d | 5676 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 5677 | scm_set_current_module (old_module); |
09074dbf DH |
5678 | } |
5679 | ||
4163eb72 MV |
5680 | static SCM |
5681 | inner_eval_x (void *data) | |
5682 | { | |
5683 | return scm_primitive_eval_x (SCM_PACK(data)); | |
5684 | } | |
5685 | ||
5686 | SCM | |
5687 | scm_eval_x (SCM exp, SCM module) | |
5688 | #define FUNC_NAME "eval!" | |
5689 | { | |
5690 | SCM_VALIDATE_MODULE (2, module); | |
5691 | ||
5692 | return scm_internal_dynamic_wind | |
5693 | (change_environment, inner_eval_x, restore_environment, | |
5694 | (void *) SCM_UNPACK (exp), | |
5695 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
5696 | } | |
5697 | #undef FUNC_NAME | |
5698 | ||
5699 | static SCM | |
5700 | inner_eval (void *data) | |
5701 | { | |
5702 | return scm_primitive_eval (SCM_PACK(data)); | |
5703 | } | |
09074dbf | 5704 | |
68d8be66 | 5705 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
5706 | (SCM exp, SCM module), |
5707 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
5708 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 5709 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
5710 | "@var{module} is made the current module. The current module\n" |
5711 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 5712 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5713 | { |
4163eb72 | 5714 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
5715 | |
5716 | return scm_internal_dynamic_wind | |
5717 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
5718 | (void *) SCM_UNPACK (exp), |
5719 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 5720 | } |
1bbd0b84 | 5721 | #undef FUNC_NAME |
0f2d19dd | 5722 | |
6dbd0af5 | 5723 | |
434f2f7a | 5724 | /* At this point, deval and scm_dapply are generated. |
6dbd0af5 MD |
5725 | */ |
5726 | ||
a44a9715 DH |
5727 | #define DEVAL |
5728 | #include "eval.c" | |
0f2d19dd | 5729 | |
1cc91f1b | 5730 | |
434f2f7a DH |
5731 | #if (SCM_ENABLE_DEPRECATED == 1) |
5732 | ||
5733 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5734 | SCM scm_ceval (SCM x, SCM env) | |
5735 | { | |
5736 | if (SCM_CONSP (x)) | |
5737 | return ceval (x, env); | |
5738 | else if (SCM_SYMBOLP (x)) | |
5739 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); | |
5740 | else | |
5741 | return SCM_XEVAL (x, env); | |
5742 | } | |
5743 | ||
5744 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5745 | SCM scm_deval (SCM x, SCM env) | |
5746 | { | |
5747 | if (SCM_CONSP (x)) | |
5748 | return deval (x, env); | |
5749 | else if (SCM_SYMBOLP (x)) | |
5750 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); | |
5751 | else | |
5752 | return SCM_XEVAL (x, env); | |
5753 | } | |
5754 | ||
5755 | static SCM | |
5756 | dispatching_eval (SCM x, SCM env) | |
5757 | { | |
5758 | if (scm_debug_mode_p) | |
5759 | return scm_deval (x, env); | |
5760 | else | |
5761 | return scm_ceval (x, env); | |
5762 | } | |
5763 | ||
5764 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5765 | SCM (*scm_ceval_ptr) (SCM x, SCM env) = dispatching_eval; | |
5766 | ||
5767 | #endif | |
5768 | ||
5769 | ||
0f2d19dd JB |
5770 | void |
5771 | scm_init_eval () | |
0f2d19dd | 5772 | { |
33b97402 MD |
5773 | scm_init_opts (scm_evaluator_traps, |
5774 | scm_evaluator_trap_table, | |
5775 | SCM_N_EVALUATOR_TRAPS); | |
5776 | scm_init_opts (scm_eval_options_interface, | |
5777 | scm_eval_opts, | |
5778 | SCM_N_EVAL_OPTIONS); | |
5779 | ||
f99c9c28 MD |
5780 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
5781 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 5782 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 5783 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 5784 | |
a44a9715 DH |
5785 | undefineds = scm_list_1 (SCM_UNDEFINED); |
5786 | SCM_SETCDR (undefineds, undefineds); | |
5787 | scm_permanent_object (undefineds); | |
7c33806a | 5788 | |
a44a9715 | 5789 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 5790 | |
a44a9715 DH |
5791 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
5792 | scm_permanent_object (f_apply); | |
86d31dfe | 5793 | |
a0599745 | 5794 | #include "libguile/eval.x" |
60a49842 | 5795 | |
25eaf21a | 5796 | scm_add_feature ("delay"); |
0f2d19dd | 5797 | } |
0f2d19dd | 5798 | |
6dbd0af5 | 5799 | #endif /* !DEVAL */ |
89e00824 ML |
5800 | |
5801 | /* | |
5802 | Local Variables: | |
5803 | c-file-style: "gnu" | |
5804 | End: | |
5805 | */ |