Commit | Line | Data |
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434f2f7a DH |
1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004 |
2 | * Free Software Foundation, Inc. | |
0f2d19dd | 3 | * |
73be1d9e MV |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License as published by the Free Software Foundation; either | |
7 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 8 | * |
73be1d9e MV |
9 | * This library is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * Lesser General Public License for more details. | |
0f2d19dd | 13 | * |
73be1d9e MV |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
1bbd0b84 | 18 | |
0f2d19dd JB |
19 | \f |
20 | ||
434f2f7a DH |
21 | /* This file is read twice in order to produce debugging versions of ceval and |
22 | * scm_apply. These functions, deval and scm_dapply, are produced when we | |
23 | * define the preprocessor macro DEVAL. The file is divided into sections | |
24 | * which are treated differently with respect to DEVAL. The heads of these | |
25 | * sections are marked with the string "SECTION:". */ | |
6dbd0af5 | 26 | |
6dbd0af5 | 27 | /* SECTION: This code is compiled once. |
0f2d19dd JB |
28 | */ |
29 | ||
3d05f2e0 RB |
30 | #if HAVE_CONFIG_H |
31 | # include <config.h> | |
32 | #endif | |
0f2d19dd | 33 | |
3d05f2e0 RB |
34 | #include "libguile/__scm.h" |
35 | ||
36 | #ifndef DEVAL | |
d16332b3 | 37 | |
48b96f4b JB |
38 | /* AIX requires this to be the first thing in the file. The #pragma |
39 | directive is indented so pre-ANSI compilers will ignore it, rather | |
40 | than choke on it. */ | |
5862b540 | 41 | #ifndef __GNUC__ |
48b96f4b JB |
42 | # if HAVE_ALLOCA_H |
43 | # include <alloca.h> | |
44 | # else | |
45 | # ifdef _AIX | |
ac13d9d2 | 46 | # pragma alloca |
48b96f4b JB |
47 | # else |
48 | # ifndef alloca /* predefined by HP cc +Olibcalls */ | |
49 | char *alloca (); | |
50 | # endif | |
51 | # endif | |
52 | # endif | |
53 | #endif | |
54 | ||
e7313a9d | 55 | #include <assert.h> |
a0599745 | 56 | #include "libguile/_scm.h" |
21628685 DH |
57 | #include "libguile/alist.h" |
58 | #include "libguile/async.h" | |
59 | #include "libguile/continuations.h" | |
a0599745 | 60 | #include "libguile/debug.h" |
328dc9a3 | 61 | #include "libguile/deprecation.h" |
09074dbf | 62 | #include "libguile/dynwind.h" |
a0599745 | 63 | #include "libguile/eq.h" |
21628685 DH |
64 | #include "libguile/feature.h" |
65 | #include "libguile/fluids.h" | |
756414cf | 66 | #include "libguile/futures.h" |
21628685 DH |
67 | #include "libguile/goops.h" |
68 | #include "libguile/hash.h" | |
69 | #include "libguile/hashtab.h" | |
70 | #include "libguile/lang.h" | |
4610b011 | 71 | #include "libguile/list.h" |
a0599745 | 72 | #include "libguile/macros.h" |
a0599745 | 73 | #include "libguile/modules.h" |
21628685 | 74 | #include "libguile/objects.h" |
a0599745 | 75 | #include "libguile/ports.h" |
7e6e6b37 | 76 | #include "libguile/print.h" |
21628685 | 77 | #include "libguile/procprop.h" |
a0599745 | 78 | #include "libguile/root.h" |
21628685 DH |
79 | #include "libguile/smob.h" |
80 | #include "libguile/srcprop.h" | |
81 | #include "libguile/stackchk.h" | |
82 | #include "libguile/strings.h" | |
83 | #include "libguile/throw.h" | |
84 | #include "libguile/validate.h" | |
a513ead3 | 85 | #include "libguile/values.h" |
21628685 | 86 | #include "libguile/vectors.h" |
a0599745 | 87 | |
a0599745 | 88 | #include "libguile/eval.h" |
89efbff4 | 89 | |
0f2d19dd JB |
90 | \f |
91 | ||
0f572ba7 | 92 | static SCM canonicalize_define (SCM expr); |
e5156567 | 93 | static SCM *scm_lookupcar1 (SCM vloc, SCM genv, int check); |
0f572ba7 | 94 | |
0a9ea92c KR |
95 | /* prototype in eval.h is not given under --disable-deprecated */ |
96 | SCM_API SCM scm_macroexp (SCM x, SCM env); | |
97 | ||
0f572ba7 DH |
98 | \f |
99 | ||
e6729603 DH |
100 | /* {Syntax Errors} |
101 | * | |
102 | * This section defines the message strings for the syntax errors that can be | |
103 | * detected during memoization and the functions and macros that shall be | |
104 | * called by the memoizer code to signal syntax errors. */ | |
105 | ||
106 | ||
107 | /* Syntax errors that can be detected during memoization: */ | |
108 | ||
109 | /* Circular or improper lists do not form valid scheme expressions. If a | |
110 | * circular list or an improper list is detected in a place where a scheme | |
111 | * expression is expected, a 'Bad expression' error is signalled. */ | |
112 | static const char s_bad_expression[] = "Bad expression"; | |
113 | ||
89bff2fc DH |
114 | /* If a form is detected that holds a different number of expressions than are |
115 | * required in that context, a 'Missing or extra expression' error is | |
116 | * signalled. */ | |
117 | static const char s_expression[] = "Missing or extra expression in"; | |
118 | ||
cc56ba80 | 119 | /* If a form is detected that holds less expressions than are required in that |
8ae95199 | 120 | * context, a 'Missing expression' error is signalled. */ |
cc56ba80 DH |
121 | static const char s_missing_expression[] = "Missing expression in"; |
122 | ||
609a8b86 | 123 | /* If a form is detected that holds more expressions than are allowed in that |
8ae95199 | 124 | * context, an 'Extra expression' error is signalled. */ |
609a8b86 DH |
125 | static const char s_extra_expression[] = "Extra expression in"; |
126 | ||
89bff2fc DH |
127 | /* The empty combination '()' is not allowed as an expression in scheme. If |
128 | * it is detected in a place where an expression is expected, an 'Illegal | |
129 | * empty combination' error is signalled. Note: If you encounter this error | |
130 | * message, it is very likely that you intended to denote the empty list. To | |
131 | * do so, you need to quote the empty list like (quote ()) or '(). */ | |
132 | static const char s_empty_combination[] = "Illegal empty combination"; | |
133 | ||
c86c440b DH |
134 | /* A body may hold an arbitrary number of internal defines, followed by a |
135 | * non-empty sequence of expressions. If a body with an empty sequence of | |
136 | * expressions is detected, a 'Missing body expression' error is signalled. | |
137 | */ | |
138 | static const char s_missing_body_expression[] = "Missing body expression in"; | |
139 | ||
140 | /* A body may hold an arbitrary number of internal defines, followed by a | |
141 | * non-empty sequence of expressions. Each the definitions and the | |
142 | * expressions may be grouped arbitraryly with begin, but it is not allowed to | |
143 | * mix definitions and expressions. If a define form in a body mixes | |
144 | * definitions and expressions, a 'Mixed definitions and expressions' error is | |
6bff1368 | 145 | * signalled. */ |
c86c440b | 146 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; |
6bff1368 DH |
147 | /* Definitions are only allowed on the top level and at the start of a body. |
148 | * If a definition is detected anywhere else, a 'Bad define placement' error | |
149 | * is signalled. */ | |
150 | static const char s_bad_define[] = "Bad define placement"; | |
c86c440b | 151 | |
2a6f7afe DH |
152 | /* Case or cond expressions must have at least one clause. If a case or cond |
153 | * expression without any clauses is detected, a 'Missing clauses' error is | |
154 | * signalled. */ | |
155 | static const char s_missing_clauses[] = "Missing clauses"; | |
156 | ||
609a8b86 DH |
157 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
158 | * last clause. If after the 'else' case clause further clauses are detected, | |
159 | * a 'Misplaced else clause' error is signalled. */ | |
160 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
161 | ||
2a6f7afe DH |
162 | /* If a case clause is detected that is not in the format |
163 | * (<label(s)> <expression1> <expression2> ...) | |
164 | * a 'Bad case clause' error is signalled. */ | |
165 | static const char s_bad_case_clause[] = "Bad case clause"; | |
166 | ||
2a6f7afe DH |
167 | /* If a case clause is detected where the <label(s)> element is neither a |
168 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
169 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
170 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
171 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
172 | * local or global environment, it is not considered a syntactic keyword, but | |
173 | * will be treated as any other variable. */ | |
174 | static const char s_bad_case_labels[] = "Bad case labels"; | |
175 | ||
176 | /* In a case statement all labels have to be distinct. If in a case statement | |
177 | * a label occurs more than once, a 'Duplicate case label' error is | |
178 | * signalled. */ | |
179 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
180 | ||
609a8b86 DH |
181 | /* If a cond clause is detected that is not in one of the formats |
182 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
183 | * a 'Bad cond clause' error is signalled. */ | |
184 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
185 | ||
186 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
187 | * not hold a recipient element for the test result, a 'Missing recipient' | |
188 | * error is signalled. */ | |
189 | static const char s_missing_recipient[] = "Missing recipient in"; | |
190 | ||
cc56ba80 DH |
191 | /* If in a position where a variable name is required some other object is |
192 | * detected, a 'Bad variable' error is signalled. */ | |
193 | static const char s_bad_variable[] = "Bad variable"; | |
194 | ||
a954ce1d DH |
195 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
196 | * possibly empty list. If any other object is detected in a place where a | |
197 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
198 | static const char s_bad_bindings[] = "Bad bindings"; | |
199 | ||
200 | /* Depending on the syntactic context, a binding has to be in the format | |
201 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
202 | * If anything else is detected in a place where a binding was expected, a | |
203 | * 'Bad binding' error is signalled. */ | |
204 | static const char s_bad_binding[] = "Bad binding"; | |
205 | ||
4610b011 DH |
206 | /* Some syntactic forms don't allow variable names to appear more than once in |
207 | * a list of bindings. If such a situation is nevertheless detected, a | |
208 | * 'Duplicate binding' error is signalled. */ | |
209 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
210 | ||
a954ce1d DH |
211 | /* If the exit form of a 'do' expression is not in the format |
212 | * (<test> <expression> ...) | |
213 | * a 'Bad exit clause' error is signalled. */ | |
214 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
215 | ||
03a3e941 DH |
216 | /* The formal function arguments of a lambda expression have to be either a |
217 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
218 | * error is signalled. */ | |
219 | static const char s_bad_formals[] = "Bad formals"; | |
220 | ||
221 | /* If in a lambda expression something else than a symbol is detected at a | |
222 | * place where a formal function argument is required, a 'Bad formal' error is | |
223 | * signalled. */ | |
224 | static const char s_bad_formal[] = "Bad formal"; | |
225 | ||
226 | /* If in the arguments list of a lambda expression an argument name occurs | |
227 | * more than once, a 'Duplicate formal' error is signalled. */ | |
228 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
229 | ||
6f81708a DH |
230 | /* If the evaluation of an unquote-splicing expression gives something else |
231 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
232 | * signalled. */ | |
233 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
234 | ||
9a848baf DH |
235 | /* If something else than an exact integer is detected as the argument for |
236 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
237 | static const char s_bad_slot_number[] = "Bad slot number"; | |
238 | ||
e6729603 DH |
239 | |
240 | /* Signal a syntax error. We distinguish between the form that caused the | |
241 | * error and the enclosing expression. The error message will print out as | |
242 | * shown in the following pattern. The file name and line number are only | |
243 | * given when they can be determined from the erroneous form or from the | |
244 | * enclosing expression. | |
245 | * | |
246 | * <filename>: In procedure memoization: | |
247 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
248 | ||
249 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
250 | ||
251 | /* The prototype is needed to indicate that the function does not return. */ | |
252 | static void | |
253 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
254 | ||
255 | static void | |
256 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
257 | { | |
258 | const SCM msg_string = scm_makfrom0str (msg); | |
259 | SCM filename = SCM_BOOL_F; | |
260 | SCM linenr = SCM_BOOL_F; | |
261 | const char *format; | |
262 | SCM args; | |
263 | ||
264 | if (SCM_CONSP (form)) | |
265 | { | |
266 | filename = scm_source_property (form, scm_sym_filename); | |
267 | linenr = scm_source_property (form, scm_sym_line); | |
268 | } | |
269 | ||
270 | if (SCM_FALSEP (filename) && SCM_FALSEP (linenr) && SCM_CONSP (expr)) | |
271 | { | |
272 | filename = scm_source_property (expr, scm_sym_filename); | |
273 | linenr = scm_source_property (expr, scm_sym_line); | |
274 | } | |
275 | ||
276 | if (!SCM_UNBNDP (expr)) | |
277 | { | |
278 | if (!SCM_FALSEP (filename)) | |
279 | { | |
280 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
281 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
282 | } | |
283 | else if (!SCM_FALSEP (linenr)) | |
284 | { | |
285 | format = "In line ~S: ~A ~S in expression ~S."; | |
286 | args = scm_list_4 (linenr, msg_string, form, expr); | |
287 | } | |
288 | else | |
289 | { | |
290 | format = "~A ~S in expression ~S."; | |
291 | args = scm_list_3 (msg_string, form, expr); | |
292 | } | |
293 | } | |
294 | else | |
295 | { | |
296 | if (!SCM_FALSEP (filename)) | |
297 | { | |
298 | format = "In file ~S, line ~S: ~A ~S."; | |
299 | args = scm_list_4 (filename, linenr, msg_string, form); | |
300 | } | |
301 | else if (!SCM_FALSEP (linenr)) | |
302 | { | |
303 | format = "In line ~S: ~A ~S."; | |
304 | args = scm_list_3 (linenr, msg_string, form); | |
305 | } | |
306 | else | |
307 | { | |
308 | format = "~A ~S."; | |
309 | args = scm_list_2 (msg_string, form); | |
310 | } | |
311 | } | |
312 | ||
313 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
314 | } | |
315 | ||
316 | ||
317 | /* Shortcut macros to simplify syntax error handling. */ | |
318 | #define ASSERT_SYNTAX(cond, message, form) \ | |
319 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
320 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
321 | { if (!(cond)) syntax_error (message, form, expr); } | |
322 | ||
323 | \f | |
324 | ||
d0624e39 DH |
325 | /* {Ilocs} |
326 | * | |
327 | * Ilocs are memoized references to variables in local environment frames. | |
328 | * They are represented as three values: The relative offset of the | |
329 | * environment frame, the number of the binding within that frame, and a | |
330 | * boolean value indicating whether the binding is the last binding in the | |
331 | * frame. | |
332 | */ | |
7e6e6b37 | 333 | |
d0624e39 | 334 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) |
7e6e6b37 DH |
335 | #define SCM_IFRINC (0x00000100L) |
336 | #define SCM_ICDR (0x00080000L) | |
d0624e39 | 337 | #define SCM_IDINC (0x00100000L) |
7e6e6b37 DH |
338 | #define SCM_IFRAME(n) ((long)((SCM_ICDR-SCM_IFRINC)>>8) \ |
339 | & (SCM_UNPACK (n) >> 8)) | |
340 | #define SCM_IDIST(n) (SCM_UNPACK (n) >> 20) | |
341 | #define SCM_ICDRP(n) (SCM_ICDR & SCM_UNPACK (n)) | |
d0624e39 DH |
342 | #define SCM_IDSTMSK (-SCM_IDINC) |
343 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ | |
344 | SCM_PACK ( \ | |
345 | ((frame_nr) << 8) \ | |
346 | + ((binding_nr) << 20) \ | |
347 | + ((last_p) ? SCM_ICDR : 0) \ | |
348 | + scm_tc8_iloc ) | |
349 | ||
7e6e6b37 DH |
350 | void |
351 | scm_i_print_iloc (SCM iloc, SCM port) | |
352 | { | |
353 | scm_puts ("#@", port); | |
354 | scm_intprint ((long) SCM_IFRAME (iloc), 10, port); | |
355 | scm_putc (SCM_ICDRP (iloc) ? '-' : '+', port); | |
356 | scm_intprint ((long) SCM_IDIST (iloc), 10, port); | |
357 | } | |
358 | ||
d0624e39 DH |
359 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) |
360 | ||
361 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
362 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, | |
363 | (SCM frame, SCM binding, SCM cdrp), | |
364 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
365 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
366 | #define FUNC_NAME s_scm_dbg_make_iloc | |
367 | { | |
368 | SCM_VALIDATE_INUM (1, frame); | |
369 | SCM_VALIDATE_INUM (2, binding); | |
370 | return SCM_MAKE_ILOC (SCM_INUM (frame), | |
371 | SCM_INUM (binding), | |
372 | !SCM_FALSEP (cdrp)); | |
373 | } | |
374 | #undef FUNC_NAME | |
375 | ||
376 | SCM scm_dbg_iloc_p (SCM obj); | |
377 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, | |
378 | (SCM obj), | |
379 | "Return @code{#t} if @var{obj} is an iloc.") | |
380 | #define FUNC_NAME s_scm_dbg_iloc_p | |
381 | { | |
382 | return SCM_BOOL (SCM_ILOCP (obj)); | |
383 | } | |
384 | #undef FUNC_NAME | |
385 | ||
386 | #endif | |
387 | ||
388 | \f | |
389 | ||
7e6e6b37 DH |
390 | /* {Evaluator byte codes (isyms)} |
391 | */ | |
392 | ||
393 | #define ISYMNUM(n) (SCM_ITAG8_DATA (n)) | |
394 | ||
395 | /* This table must agree with the list of SCM_IM_ constants in tags.h */ | |
396 | static const char *const isymnames[] = | |
397 | { | |
398 | "#@and", | |
399 | "#@begin", | |
400 | "#@case", | |
401 | "#@cond", | |
402 | "#@do", | |
403 | "#@if", | |
404 | "#@lambda", | |
405 | "#@let", | |
406 | "#@let*", | |
407 | "#@letrec", | |
408 | "#@or", | |
409 | "#@quote", | |
410 | "#@set!", | |
411 | "#@define", | |
412 | "#@apply", | |
413 | "#@call-with-current-continuation", | |
414 | "#@dispatch", | |
415 | "#@slot-ref", | |
416 | "#@slot-set!", | |
417 | "#@delay", | |
418 | "#@future", | |
419 | "#@call-with-values", | |
420 | "#@else", | |
421 | "#@arrow", | |
422 | "#@nil-cond", | |
423 | "#@bind" | |
424 | }; | |
425 | ||
426 | void | |
427 | scm_i_print_isym (SCM isym, SCM port) | |
428 | { | |
429 | const size_t isymnum = ISYMNUM (isym); | |
430 | if (isymnum < (sizeof isymnames / sizeof (char *))) | |
431 | scm_puts (isymnames[isymnum], port); | |
432 | else | |
433 | scm_ipruk ("isym", isym, port); | |
434 | } | |
435 | ||
436 | \f | |
437 | ||
e5156567 DH |
438 | /* The function lookup_symbol is used during memoization: Lookup the symbol in |
439 | * the environment. If there is no binding for the symbol, SCM_UNDEFINED is | |
57d23e25 DH |
440 | * returned. If the symbol is a global variable, the variable object to which |
441 | * the symbol is bound is returned. Finally, if the symbol is a local | |
442 | * variable the corresponding iloc object is returned. */ | |
6f81708a DH |
443 | |
444 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
445 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
57d23e25 DH |
446 | * is unbound and it returns a variable object if the symbol is a global |
447 | * variable. */ | |
6f81708a DH |
448 | static SCM |
449 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
450 | { | |
451 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
452 | if (SCM_FALSEP (variable)) | |
57d23e25 | 453 | return SCM_UNDEFINED; |
6f81708a | 454 | else |
57d23e25 | 455 | return variable; |
6f81708a DH |
456 | } |
457 | ||
458 | static SCM | |
459 | lookup_symbol (const SCM symbol, const SCM env) | |
460 | { | |
461 | SCM frame_idx; | |
462 | unsigned int frame_nr; | |
463 | ||
464 | for (frame_idx = env, frame_nr = 0; | |
465 | !SCM_NULLP (frame_idx); | |
466 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) | |
467 | { | |
468 | const SCM frame = SCM_CAR (frame_idx); | |
469 | if (SCM_CONSP (frame)) | |
470 | { | |
471 | /* frame holds a local environment frame */ | |
472 | SCM symbol_idx; | |
473 | unsigned int symbol_nr; | |
474 | ||
475 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
476 | SCM_CONSP (symbol_idx); | |
477 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) | |
478 | { | |
479 | if (SCM_EQ_P (SCM_CAR (symbol_idx), symbol)) | |
480 | /* found the symbol, therefore return the iloc */ | |
481 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
482 | } | |
483 | if (SCM_EQ_P (symbol_idx, symbol)) | |
484 | /* found the symbol as the last element of the current frame */ | |
485 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
486 | } | |
487 | else | |
488 | { | |
489 | /* no more local environment frames */ | |
490 | return lookup_global_symbol (symbol, frame); | |
491 | } | |
492 | } | |
493 | ||
494 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
495 | } | |
496 | ||
497 | ||
498 | /* Return true if the symbol is - from the point of view of a macro | |
499 | * transformer - a literal in the sense specified in chapter "pattern | |
500 | * language" of R5RS. In the code below, however, we don't match the | |
501 | * definition of R5RS exactly: It returns true if the identifier has no | |
502 | * binding or if it is a syntactic keyword. */ | |
503 | static int | |
504 | literal_p (const SCM symbol, const SCM env) | |
505 | { | |
57d23e25 DH |
506 | const SCM variable = lookup_symbol (symbol, env); |
507 | if (SCM_UNBNDP (variable)) | |
508 | return 1; | |
509 | if (SCM_VARIABLEP (variable) && SCM_MACROP (SCM_VARIABLE_REF (variable))) | |
6f81708a DH |
510 | return 1; |
511 | else | |
512 | return 0; | |
513 | } | |
17fa3fcf | 514 | |
5fb64383 DH |
515 | |
516 | /* Return true if the expression is self-quoting in the memoized code. Thus, | |
517 | * some other objects (like e. g. vectors) are reported as self-quoting, which | |
518 | * according to R5RS would need to be quoted. */ | |
519 | static int | |
520 | is_self_quoting_p (const SCM expr) | |
521 | { | |
522 | if (SCM_CONSP (expr)) | |
523 | return 0; | |
524 | else if (SCM_SYMBOLP (expr)) | |
525 | return 0; | |
526 | else if (SCM_NULLP (expr)) | |
527 | return 0; | |
528 | else return 1; | |
529 | } | |
530 | ||
0f2d19dd | 531 | |
34adf7ea DH |
532 | /* Rewrite the body (which is given as the list of expressions forming the |
533 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
534 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
535 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
536 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 537 | * SCM_IM_LET, etc. |
34adf7ea DH |
538 | * |
539 | * It is assumed that the calling expression has already made sure that the | |
540 | * body is a proper list. */ | |
26d5b9b4 | 541 | static SCM |
430b8401 | 542 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 543 | { |
26d5b9b4 | 544 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
545 | if (SCM_ISYMP (SCM_CAR (exprs))) |
546 | return exprs; | |
547 | else | |
548 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
549 | } |
550 | ||
1cc91f1b | 551 | |
57d23e25 DH |
552 | /* The function m_expand_body memoizes a proper list of expressions forming a |
553 | * body. This function takes care of dealing with internal defines and | |
554 | * transforming them into an equivalent letrec expression. The list of | |
555 | * expressions is rewritten in place. */ | |
910b5125 | 556 | |
57d23e25 DH |
557 | /* This is a helper function for m_expand_body. If the argument expression is |
558 | * a symbol that denotes a syntactic keyword, the corresponding macro object | |
559 | * is returned, in all other cases the function returns SCM_UNDEFINED. */ | |
910b5125 DH |
560 | static SCM |
561 | try_macro_lookup (const SCM expr, const SCM env) | |
562 | { | |
563 | if (SCM_SYMBOLP (expr)) | |
564 | { | |
57d23e25 DH |
565 | const SCM variable = lookup_symbol (expr, env); |
566 | if (SCM_VARIABLEP (variable)) | |
567 | { | |
568 | const SCM value = SCM_VARIABLE_REF (variable); | |
569 | if (SCM_MACROP (value)) | |
570 | return value; | |
571 | } | |
910b5125 | 572 | } |
57d23e25 DH |
573 | |
574 | return SCM_UNDEFINED; | |
910b5125 DH |
575 | } |
576 | ||
577 | /* This is a helper function for m_expand_body. It expands user macros, | |
578 | * because for the correct translation of a body we need to know whether they | |
579 | * expand to a definition. */ | |
580 | static SCM | |
581 | expand_user_macros (SCM expr, const SCM env) | |
582 | { | |
583 | while (SCM_CONSP (expr)) | |
584 | { | |
585 | const SCM car_expr = SCM_CAR (expr); | |
586 | const SCM new_car = expand_user_macros (car_expr, env); | |
587 | const SCM value = try_macro_lookup (new_car, env); | |
588 | ||
589 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
590 | { | |
591 | /* User macros transform code into code. */ | |
592 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
593 | /* We need to reiterate on the transformed code. */ | |
594 | } | |
595 | else | |
596 | { | |
597 | /* No user macro: return. */ | |
598 | SCM_SETCAR (expr, new_car); | |
599 | return expr; | |
600 | } | |
601 | } | |
602 | ||
603 | return expr; | |
604 | } | |
605 | ||
606 | /* This is a helper function for m_expand_body. It determines if a given form | |
607 | * represents an application of a given built-in macro. The built-in macro to | |
608 | * check for is identified by its syntactic keyword. The form is an | |
609 | * application of the given macro if looking up the car of the form in the | |
610 | * given environment actually returns the built-in macro. */ | |
611 | static int | |
612 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
613 | { | |
614 | if (SCM_CONSP (form)) | |
615 | { | |
616 | const SCM car_form = SCM_CAR (form); | |
617 | const SCM value = try_macro_lookup (car_form, env); | |
618 | if (SCM_BUILTIN_MACRO_P (value)) | |
619 | { | |
620 | const SCM macro_name = scm_macro_name (value); | |
621 | return SCM_EQ_P (macro_name, syntactic_keyword); | |
622 | } | |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
9d4bf6d3 | 628 | static void |
910b5125 DH |
629 | m_expand_body (const SCM forms, const SCM env) |
630 | { | |
631 | /* The first body form can be skipped since it is known to be the ISYM that | |
632 | * was prepended to the body by m_body. */ | |
633 | SCM cdr_forms = SCM_CDR (forms); | |
634 | SCM form_idx = cdr_forms; | |
635 | SCM definitions = SCM_EOL; | |
636 | SCM sequence = SCM_EOL; | |
637 | ||
638 | /* According to R5RS, the list of body forms consists of two parts: a number | |
639 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
640 | * expressions. Each the definitions and the expressions may be grouped | |
641 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
642 | * expressions. The task of the following loop therefore is to split the | |
643 | * list of body forms into the list of definitions and the sequence of | |
644 | * expressions. */ | |
645 | while (!SCM_NULLP (form_idx)) | |
646 | { | |
647 | const SCM form = SCM_CAR (form_idx); | |
648 | const SCM new_form = expand_user_macros (form, env); | |
649 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
650 | { | |
651 | definitions = scm_cons (new_form, definitions); | |
652 | form_idx = SCM_CDR (form_idx); | |
653 | } | |
654 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
655 | { | |
656 | /* We have encountered a group of forms. This has to be either a | |
657 | * (possibly empty) group of (possibly further grouped) definitions, | |
658 | * or a non-empty group of (possibly further grouped) | |
659 | * expressions. */ | |
660 | const SCM grouped_forms = SCM_CDR (new_form); | |
661 | unsigned int found_definition = 0; | |
662 | unsigned int found_expression = 0; | |
663 | SCM grouped_form_idx = grouped_forms; | |
664 | while (!found_expression && !SCM_NULLP (grouped_form_idx)) | |
665 | { | |
666 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
667 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
668 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
669 | { | |
670 | found_definition = 1; | |
671 | definitions = scm_cons (new_inner_form, definitions); | |
672 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
673 | } | |
674 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
675 | { | |
676 | const SCM inner_group = SCM_CDR (new_inner_form); | |
677 | grouped_form_idx | |
678 | = scm_append (scm_list_2 (inner_group, | |
679 | SCM_CDR (grouped_form_idx))); | |
680 | } | |
681 | else | |
682 | { | |
683 | /* The group marks the start of the expressions of the body. | |
684 | * We have to make sure that within the same group we have | |
685 | * not encountered a definition before. */ | |
686 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
687 | found_expression = 1; | |
688 | grouped_form_idx = SCM_EOL; | |
689 | } | |
690 | } | |
691 | ||
692 | /* We have finished processing the group. If we have not yet | |
693 | * encountered an expression we continue processing the forms of the | |
694 | * body to collect further definition forms. Otherwise, the group | |
695 | * marks the start of the sequence of expressions of the body. */ | |
696 | if (!found_expression) | |
697 | { | |
698 | form_idx = SCM_CDR (form_idx); | |
699 | } | |
700 | else | |
701 | { | |
702 | sequence = form_idx; | |
703 | form_idx = SCM_EOL; | |
704 | } | |
705 | } | |
706 | else | |
707 | { | |
708 | /* We have detected a form which is no definition. This marks the | |
709 | * start of the sequence of expressions of the body. */ | |
710 | sequence = form_idx; | |
711 | form_idx = SCM_EOL; | |
712 | } | |
713 | } | |
714 | ||
715 | /* FIXME: forms does not hold information about the file location. */ | |
716 | ASSERT_SYNTAX (SCM_CONSP (sequence), s_missing_body_expression, cdr_forms); | |
717 | ||
718 | if (!SCM_NULLP (definitions)) | |
719 | { | |
720 | SCM definition_idx; | |
721 | SCM letrec_tail; | |
722 | SCM letrec_expression; | |
723 | SCM new_letrec_expression; | |
910b5125 DH |
724 | |
725 | SCM bindings = SCM_EOL; | |
726 | for (definition_idx = definitions; | |
727 | !SCM_NULLP (definition_idx); | |
728 | definition_idx = SCM_CDR (definition_idx)) | |
729 | { | |
730 | const SCM definition = SCM_CAR (definition_idx); | |
731 | const SCM canonical_definition = canonicalize_define (definition); | |
732 | const SCM binding = SCM_CDR (canonical_definition); | |
733 | bindings = scm_cons (binding, bindings); | |
734 | }; | |
735 | ||
736 | letrec_tail = scm_cons (bindings, sequence); | |
737 | /* FIXME: forms does not hold information about the file location. */ | |
738 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
739 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
740 | SCM_SETCAR (forms, new_letrec_expression); |
741 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
742 | } |
743 | else | |
744 | { | |
745 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
746 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
747 | } |
748 | } | |
749 | ||
910b5125 | 750 | |
9fbee57e | 751 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
752 | |
753 | ||
3b88ed2a | 754 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 755 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 756 | |
8ea46249 | 757 | SCM |
e6729603 | 758 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 759 | { |
e6729603 DH |
760 | const SCM cdr_expr = SCM_CDR (expr); |
761 | const long length = scm_ilength (cdr_expr); | |
762 | ||
763 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
764 | ||
765 | if (length == 0) | |
766 | { | |
767 | /* Special case: (and) is replaced by #t. */ | |
768 | return SCM_BOOL_T; | |
769 | } | |
0f2d19dd | 770 | else |
e6729603 DH |
771 | { |
772 | SCM_SETCAR (expr, SCM_IM_AND); | |
773 | return expr; | |
774 | } | |
0f2d19dd JB |
775 | } |
776 | ||
1cc91f1b | 777 | |
3b88ed2a | 778 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 779 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
780 | |
781 | SCM | |
2a6f7afe | 782 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 783 | { |
2a6f7afe | 784 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
785 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
786 | * That means, there should be a distinction between uses of begin where an | |
787 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
788 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
789 | ||
790 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
791 | return expr; | |
0f2d19dd JB |
792 | } |
793 | ||
794 | ||
3b88ed2a | 795 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 796 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 797 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 798 | |
8ea46249 | 799 | SCM |
2a6f7afe | 800 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 801 | { |
8ea46249 | 802 | SCM clauses; |
2a6f7afe DH |
803 | SCM all_labels = SCM_EOL; |
804 | ||
805 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
806 | const int else_literal_p = literal_p (scm_sym_else, env); | |
807 | ||
808 | const SCM cdr_expr = SCM_CDR (expr); | |
809 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
810 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
811 | ||
812 | clauses = SCM_CDR (cdr_expr); | |
8ea46249 | 813 | while (!SCM_NULLP (clauses)) |
0f2d19dd | 814 | { |
2a6f7afe DH |
815 | SCM labels; |
816 | ||
817 | const SCM clause = SCM_CAR (clauses); | |
818 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
819 | s_bad_case_clause, clause, expr); | |
820 | ||
821 | labels = SCM_CAR (clause); | |
822 | if (SCM_CONSP (labels)) | |
823 | { | |
824 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
825 | s_bad_case_labels, labels, expr); | |
26ecfa39 | 826 | all_labels = scm_append (scm_list_2 (labels, all_labels)); |
2a6f7afe | 827 | } |
58a2510b DH |
828 | else if (SCM_NULLP (labels)) |
829 | { | |
830 | /* The list of labels is empty. According to R5RS this is allowed. | |
831 | * It means that the sequence of expressions will never be executed. | |
832 | * Therefore, as an optimization, we could remove the whole | |
833 | * clause. */ | |
834 | } | |
2a6f7afe DH |
835 | else |
836 | { | |
837 | ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p, | |
838 | s_bad_case_labels, labels, expr); | |
839 | ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)), | |
609a8b86 | 840 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
841 | } |
842 | ||
843 | /* build the new clause */ | |
844 | if (SCM_EQ_P (labels, scm_sym_else)) | |
845 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
846 | ||
8ea46249 | 847 | clauses = SCM_CDR (clauses); |
0f2d19dd | 848 | } |
2a6f7afe DH |
849 | |
850 | /* Check whether all case labels are distinct. */ | |
851 | for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels)) | |
852 | { | |
853 | const SCM label = SCM_CAR (all_labels); | |
4610b011 DH |
854 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (label, SCM_CDR (all_labels))), |
855 | s_duplicate_case_label, label, expr); | |
2a6f7afe DH |
856 | } |
857 | ||
858 | SCM_SETCAR (expr, SCM_IM_CASE); | |
859 | return expr; | |
0f2d19dd JB |
860 | } |
861 | ||
862 | ||
3b88ed2a | 863 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 864 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 865 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 866 | |
8ea46249 | 867 | SCM |
609a8b86 | 868 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 869 | { |
609a8b86 DH |
870 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
871 | const int else_literal_p = literal_p (scm_sym_else, env); | |
872 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
873 | ||
874 | const SCM clauses = SCM_CDR (expr); | |
875 | SCM clause_idx; | |
876 | ||
877 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
878 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
879 | ||
880 | for (clause_idx = clauses; | |
881 | !SCM_NULLP (clause_idx); | |
882 | clause_idx = SCM_CDR (clause_idx)) | |
0f2d19dd | 883 | { |
609a8b86 DH |
884 | SCM test; |
885 | ||
886 | const SCM clause = SCM_CAR (clause_idx); | |
887 | const long length = scm_ilength (clause); | |
888 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
889 | ||
890 | test = SCM_CAR (clause); | |
891 | if (SCM_EQ_P (test, scm_sym_else) && else_literal_p) | |
0f2d19dd | 892 | { |
609a8b86 DH |
893 | const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx)); |
894 | ASSERT_SYNTAX_2 (length >= 2, | |
895 | s_bad_cond_clause, clause, expr); | |
896 | ASSERT_SYNTAX_2 (last_clause_p, | |
897 | s_misplaced_else_clause, clause, expr); | |
898 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 899 | } |
609a8b86 DH |
900 | else if (length >= 2 |
901 | && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow) | |
902 | && arrow_literal_p) | |
903 | { | |
904 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
905 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
906 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 907 | } |
0f2d19dd | 908 | } |
609a8b86 DH |
909 | |
910 | SCM_SETCAR (expr, SCM_IM_COND); | |
911 | return expr; | |
0f2d19dd JB |
912 | } |
913 | ||
1cc91f1b | 914 | |
0f572ba7 DH |
915 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
916 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 917 | |
9fbee57e DH |
918 | /* Guile provides an extension to R5RS' define syntax to represent function |
919 | * currying in a compact way. With this extension, it is allowed to write | |
920 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
921 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
922 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
923 | * should be either a sequence of zero or more variables, or a sequence of one | |
924 | * or more variables followed by a space-delimited period and another | |
925 | * variable. Each level of argument nesting wraps the <body> within another | |
926 | * lambda expression. For example, the following forms are allowed, each one | |
927 | * followed by an equivalent, more explicit implementation. | |
928 | * Example 1: | |
929 | * (define ((a b . c) . d) <body>) is equivalent to | |
930 | * (define a (lambda (b . c) (lambda d <body>))) | |
931 | * Example 2: | |
932 | * (define (((a) b) c . d) <body>) is equivalent to | |
933 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
934 | */ | |
935 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
936 | * module that does not implement this extension. */ | |
0f572ba7 DH |
937 | static SCM |
938 | canonicalize_define (const SCM expr) | |
5280aaca | 939 | { |
cc56ba80 DH |
940 | SCM body; |
941 | SCM variable; | |
942 | ||
943 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 944 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
945 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
946 | ||
947 | body = SCM_CDR (cdr_expr); | |
948 | variable = SCM_CAR (cdr_expr); | |
949 | while (SCM_CONSP (variable)) | |
5280aaca | 950 | { |
cc56ba80 DH |
951 | /* This while loop realizes function currying by variable nesting. |
952 | * Variable is known to be a nested-variable. In every iteration of the | |
953 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
954 | * innermost one. Note that we don't check for duplicate formals here: |
955 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
956 | const SCM formals = SCM_CDR (variable); |
957 | const SCM tail = scm_cons (formals, body); | |
958 | ||
959 | /* Add source properties to each new lambda expression: */ | |
960 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
961 | ||
962 | body = scm_list_1 (lambda); | |
963 | variable = SCM_CAR (variable); | |
5280aaca | 964 | } |
cc56ba80 DH |
965 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); |
966 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
967 | ||
0f572ba7 DH |
968 | SCM_SETCAR (cdr_expr, variable); |
969 | SCM_SETCDR (cdr_expr, body); | |
970 | return expr; | |
971 | } | |
972 | ||
36245b66 DH |
973 | /* According to section 5.2.1 of R5RS we first have to make sure that the |
974 | * variable is bound, and then perform the (set! variable expression) | |
975 | * operation. This means, that within the expression we may already assign | |
976 | * values to variable: (define foo (begin (set! foo 1) (+ foo 1))) */ | |
0f572ba7 DH |
977 | SCM |
978 | scm_m_define (SCM expr, SCM env) | |
979 | { | |
6bff1368 | 980 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 981 | |
6bff1368 DH |
982 | { |
983 | const SCM canonical_definition = canonicalize_define (expr); | |
984 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
985 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
36245b66 DH |
986 | const SCM location |
987 | = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); | |
988 | const SCM value = scm_eval_car (SCM_CDR (cdr_canonical_definition), env); | |
6bff1368 | 989 | |
6bff1368 DH |
990 | if (SCM_REC_PROCNAMES_P) |
991 | { | |
992 | SCM tmp = value; | |
993 | while (SCM_MACROP (tmp)) | |
994 | tmp = SCM_MACRO_CODE (tmp); | |
995 | if (SCM_CLOSUREP (tmp) | |
996 | /* Only the first definition determines the name. */ | |
997 | && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name))) | |
998 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); | |
999 | } | |
0f572ba7 | 1000 | |
36245b66 | 1001 | SCM_VARIABLE_SET (location, value); |
6bff1368 DH |
1002 | |
1003 | return SCM_UNSPECIFIED; | |
1004 | } | |
0f2d19dd JB |
1005 | } |
1006 | ||
1007 | ||
8ae95199 DH |
1008 | /* This is a helper function for forms (<keyword> <expression>) that are |
1009 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1010 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1011 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1012 | static SCM | |
1013 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1014 | { | |
1015 | const SCM cdr_expr = SCM_CDR (expr); | |
1016 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1017 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1018 | ||
1019 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1020 | ||
1021 | return expr; | |
1022 | } | |
1023 | ||
1024 | ||
3b88ed2a | 1025 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1026 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1027 | |
9fbee57e DH |
1028 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1029 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1030 | * the empty list represents the empty parameter list. This representation | |
1031 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1032 | SCM |
8ae95199 | 1033 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1034 | { |
8ae95199 DH |
1035 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1036 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1037 | return new_expr; | |
0f2d19dd JB |
1038 | } |
1039 | ||
8ea46249 | 1040 | |
a954ce1d DH |
1041 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1042 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1043 | ||
302c12b4 | 1044 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1045 | * reversed here. During the evaluation this allows for simple consing of the |
1046 | * results of the inits and steps: | |
302c12b4 | 1047 | |
0f2d19dd | 1048 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1049 | (<var2> <init2>) |
1050 | ... ) | |
1051 | (<test> <return>) | |
1052 | <body>) | |
302c12b4 | 1053 | |
0f2d19dd | 1054 | ;; becomes |
302c12b4 | 1055 | |
e681d187 | 1056 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1057 | (varn ... var2 var1) |
1058 | (<test> <return>) | |
1059 | (<body>) | |
1060 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1061 | */ |
0f2d19dd | 1062 | SCM |
a954ce1d | 1063 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1064 | { |
a954ce1d DH |
1065 | SCM variables = SCM_EOL; |
1066 | SCM init_forms = SCM_EOL; | |
1067 | SCM step_forms = SCM_EOL; | |
1068 | SCM binding_idx; | |
1069 | SCM cddr_expr; | |
1070 | SCM exit_clause; | |
1071 | SCM commands; | |
1072 | SCM tail; | |
1073 | ||
1074 | const SCM cdr_expr = SCM_CDR (expr); | |
1075 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1076 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1077 | ||
1078 | /* Collect variables, init and step forms. */ | |
1079 | binding_idx = SCM_CAR (cdr_expr); | |
1080 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1081 | s_bad_bindings, binding_idx, expr); | |
1082 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1083 | { |
a954ce1d DH |
1084 | const SCM binding = SCM_CAR (binding_idx); |
1085 | const long length = scm_ilength (binding); | |
1086 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1087 | s_bad_binding, binding, expr); | |
1088 | ||
302c12b4 | 1089 | { |
a954ce1d DH |
1090 | const SCM name = SCM_CAR (binding); |
1091 | const SCM init = SCM_CADR (binding); | |
1092 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
1093 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
4610b011 DH |
1094 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, variables)), |
1095 | s_duplicate_binding, name, expr); | |
1096 | ||
a954ce1d DH |
1097 | variables = scm_cons (name, variables); |
1098 | init_forms = scm_cons (init, init_forms); | |
1099 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1100 | } |
0f2d19dd | 1101 | } |
a954ce1d DH |
1102 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1103 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1104 | ||
1105 | /* Memoize the test form and the exit sequence. */ | |
1106 | cddr_expr = SCM_CDR (cdr_expr); | |
1107 | exit_clause = SCM_CAR (cddr_expr); | |
1108 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1109 | s_bad_exit_clause, exit_clause, expr); | |
1110 | ||
1111 | commands = SCM_CDR (cddr_expr); | |
1112 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1113 | tail = scm_cons2 (init_forms, variables, tail); | |
1114 | SCM_SETCAR (expr, SCM_IM_DO); | |
1115 | SCM_SETCDR (expr, tail); | |
1116 | return expr; | |
0f2d19dd JB |
1117 | } |
1118 | ||
b8229a3b | 1119 | |
3b88ed2a | 1120 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1121 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1122 | |
9fbee57e | 1123 | SCM |
4610b011 | 1124 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1125 | { |
4610b011 DH |
1126 | const SCM cdr_expr = SCM_CDR (expr); |
1127 | const long length = scm_ilength (cdr_expr); | |
1128 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1129 | SCM_SETCAR (expr, SCM_IM_IF); | |
1130 | return expr; | |
0f2d19dd JB |
1131 | } |
1132 | ||
302c12b4 | 1133 | |
3b88ed2a | 1134 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1135 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1136 | |
4610b011 DH |
1137 | /* A helper function for memoize_lambda to support checking for duplicate |
1138 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1139 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1140 | * forms that a formal argument can have: | |
1141 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1142 | static int |
4610b011 | 1143 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1144 | { |
9fbee57e DH |
1145 | for (; SCM_CONSP (list); list = SCM_CDR (list)) |
1146 | { | |
1147 | if (SCM_EQ_P (SCM_CAR (list), obj)) | |
4610b011 | 1148 | return 1; |
9fbee57e DH |
1149 | } |
1150 | return SCM_EQ_P (list, obj); | |
5cb22e96 DH |
1151 | } |
1152 | ||
28d52ebb | 1153 | SCM |
03a3e941 | 1154 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1155 | { |
9fbee57e | 1156 | SCM formals; |
03a3e941 | 1157 | SCM formals_idx; |
34adf7ea DH |
1158 | SCM cddr_expr; |
1159 | int documentation; | |
1160 | SCM body; | |
1161 | SCM new_body; | |
03a3e941 DH |
1162 | |
1163 | const SCM cdr_expr = SCM_CDR (expr); | |
1164 | const long length = scm_ilength (cdr_expr); | |
1165 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1166 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1167 | |
03a3e941 DH |
1168 | /* Before iterating the list of formal arguments, make sure the formals |
1169 | * actually are given as either a symbol or a non-cyclic list. */ | |
1170 | formals = SCM_CAR (cdr_expr); | |
1171 | if (SCM_CONSP (formals)) | |
1172 | { | |
1173 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1174 | * detected, report a 'Bad formals' error. */ | |
1175 | } | |
1176 | else | |
1177 | { | |
1178 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formals) || SCM_NULLP (formals), | |
1179 | s_bad_formals, formals, expr); | |
1180 | } | |
1cc91f1b | 1181 | |
03a3e941 DH |
1182 | /* Now iterate the list of formal arguments to check if all formals are |
1183 | * symbols, and that there are no duplicates. */ | |
1184 | formals_idx = formals; | |
1185 | while (SCM_CONSP (formals_idx)) | |
0f2d19dd | 1186 | { |
03a3e941 DH |
1187 | const SCM formal = SCM_CAR (formals_idx); |
1188 | const SCM next_idx = SCM_CDR (formals_idx); | |
1189 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formal), s_bad_formal, formal, expr); | |
1190 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), | |
1191 | s_duplicate_formal, formal, expr); | |
1192 | formals_idx = next_idx; | |
0f2d19dd | 1193 | } |
03a3e941 DH |
1194 | ASSERT_SYNTAX_2 (SCM_NULLP (formals_idx) || SCM_SYMBOLP (formals_idx), |
1195 | s_bad_formal, formals_idx, expr); | |
9fbee57e | 1196 | |
34adf7ea DH |
1197 | /* Memoize the body. Keep a potential documentation string. */ |
1198 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1199 | * some external database. Otherwise it will slow down execution, since | |
1200 | * the documentation string will have to be skipped with every execution | |
1201 | * of the closure. */ | |
1202 | cddr_expr = SCM_CDR (cdr_expr); | |
1203 | documentation = (length >= 3 && SCM_STRINGP (SCM_CAR (cddr_expr))); | |
1204 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; | |
430b8401 | 1205 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1206 | |
1207 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1208 | if (documentation) | |
1209 | SCM_SETCDR (cddr_expr, new_body); | |
1210 | else | |
1211 | SCM_SETCDR (cdr_expr, new_body); | |
1212 | return expr; | |
0f2d19dd | 1213 | } |
6dbd0af5 | 1214 | |
0f2d19dd | 1215 | |
d6754c23 | 1216 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1217 | static void |
d6754c23 | 1218 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1219 | { |
d6754c23 | 1220 | SCM binding_idx; |
302c12b4 | 1221 | |
d6754c23 DH |
1222 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1223 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1224 | |
d6754c23 DH |
1225 | binding_idx = bindings; |
1226 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1227 | { |
d6754c23 DH |
1228 | SCM name; /* const */ |
1229 | ||
1230 | const SCM binding = SCM_CAR (binding_idx); | |
1231 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1232 | s_bad_binding, binding, expr); | |
1233 | ||
1234 | name = SCM_CAR (binding); | |
1235 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
0f2d19dd | 1236 | } |
d6754c23 | 1237 | } |
26d5b9b4 | 1238 | |
d6754c23 DH |
1239 | |
1240 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1241 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1242 | * variables are returned in a list with their order reversed, and the init | |
1243 | * forms are returned in a list in the same order as they are given in the | |
1244 | * bindings. If a duplicate variable name is detected, an error is | |
1245 | * signalled. */ | |
1246 | static void | |
1247 | transform_bindings ( | |
1248 | const SCM bindings, const SCM expr, | |
1249 | SCM *const rvarptr, SCM *const initptr ) | |
1250 | { | |
1251 | SCM rvariables = SCM_EOL; | |
1252 | SCM rinits = SCM_EOL; | |
1253 | SCM binding_idx = bindings; | |
1254 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
1255 | { | |
1256 | const SCM binding = SCM_CAR (binding_idx); | |
1257 | const SCM cdr_binding = SCM_CDR (binding); | |
1258 | const SCM name = SCM_CAR (binding); | |
1259 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, rvariables)), | |
1260 | s_duplicate_binding, name, expr); | |
1261 | rvariables = scm_cons (name, rvariables); | |
1262 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1263 | } | |
1264 | *rvarptr = rvariables; | |
1265 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1266 | } |
1267 | ||
302c12b4 | 1268 | |
3b88ed2a | 1269 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1270 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1271 | |
d6754c23 DH |
1272 | /* This function is a helper function for memoize_let. It transforms |
1273 | * (let name ((var init) ...) body ...) into | |
1274 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1275 | * and memoizes the expression. It is assumed that the caller has checked | |
1276 | * that name is a symbol and that there are bindings and a body. */ | |
1277 | static SCM | |
1278 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1279 | { | |
1280 | SCM rvariables; | |
1281 | SCM variables; | |
1282 | SCM inits; | |
1283 | ||
1284 | const SCM cdr_expr = SCM_CDR (expr); | |
1285 | const SCM name = SCM_CAR (cdr_expr); | |
1286 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1287 | const SCM bindings = SCM_CAR (cddr_expr); | |
1288 | check_bindings (bindings, expr); | |
1289 | ||
1290 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1291 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1292 | ||
1293 | { | |
1294 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1295 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1296 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1297 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1298 | ||
1299 | const SCM rvar = scm_list_1 (name); | |
1300 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1301 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1302 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1303 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1304 | return scm_cons_source (expr, letrec_form, inits); | |
1305 | } | |
1306 | } | |
1307 | ||
1308 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1309 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1310 | SCM |
d6754c23 | 1311 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1312 | { |
d6754c23 DH |
1313 | SCM bindings; |
1314 | ||
1315 | const SCM cdr_expr = SCM_CDR (expr); | |
1316 | const long length = scm_ilength (cdr_expr); | |
1317 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1318 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1319 | |
d6754c23 DH |
1320 | bindings = SCM_CAR (cdr_expr); |
1321 | if (SCM_SYMBOLP (bindings)) | |
26d5b9b4 | 1322 | { |
d6754c23 DH |
1323 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1324 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1325 | } |
d6754c23 DH |
1326 | |
1327 | check_bindings (bindings, expr); | |
1328 | if (SCM_NULLP (bindings) || SCM_NULLP (SCM_CDR (bindings))) | |
26d5b9b4 | 1329 | { |
d6754c23 | 1330 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1331 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1332 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1333 | } |
302c12b4 DH |
1334 | else |
1335 | { | |
d6754c23 DH |
1336 | /* plain let */ |
1337 | SCM rvariables; | |
1338 | SCM inits; | |
1339 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1340 | |
302c12b4 | 1341 | { |
430b8401 | 1342 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1343 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1344 | SCM_SETCAR (expr, SCM_IM_LET); | |
1345 | SCM_SETCDR (expr, new_tail); | |
1346 | return expr; | |
302c12b4 DH |
1347 | } |
1348 | } | |
0f2d19dd JB |
1349 | } |
1350 | ||
1351 | ||
3b88ed2a | 1352 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1353 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1354 | |
d6754c23 DH |
1355 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1356 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1357 | SCM |
d6754c23 | 1358 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1359 | { |
d6754c23 | 1360 | SCM binding_idx; |
d6754c23 | 1361 | SCM new_body; |
0f2d19dd | 1362 | |
d6754c23 DH |
1363 | const SCM cdr_expr = SCM_CDR (expr); |
1364 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1365 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1366 | |
d6754c23 DH |
1367 | binding_idx = SCM_CAR (cdr_expr); |
1368 | check_bindings (binding_idx, expr); | |
1369 | ||
461bffb1 DH |
1370 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1371 | * transformation is done in place. At the beginning of one iteration of | |
1372 | * the loop the variable binding_idx holds the form | |
1373 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1374 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1375 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1376 | * untouched. After the execution of the loop, P1 will hold | |
1377 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1378 | * and binding_idx will hold P3. */ | |
1379 | while (!SCM_NULLP (binding_idx)) | |
9fbee57e | 1380 | { |
461bffb1 | 1381 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1382 | const SCM binding = SCM_CAR (binding_idx); |
1383 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1384 | const SCM cdr_binding = SCM_CDR (binding); |
1385 | ||
1386 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1387 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1388 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1389 | ||
1390 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1391 | } |
1392 | ||
430b8401 | 1393 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1394 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1395 | /* the bindings have been changed in place */ | |
1396 | SCM_SETCDR (cdr_expr, new_body); | |
1397 | return expr; | |
9fbee57e | 1398 | } |
b8229a3b | 1399 | |
0f2d19dd | 1400 | |
3b88ed2a | 1401 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); |
9fbee57e | 1402 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); |
1cc91f1b | 1403 | |
0f2d19dd | 1404 | SCM |
d6754c23 | 1405 | scm_m_letrec (SCM expr, SCM env) |
0f2d19dd | 1406 | { |
d6754c23 DH |
1407 | SCM bindings; |
1408 | ||
1409 | const SCM cdr_expr = SCM_CDR (expr); | |
1410 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1411 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1412 | ||
1413 | bindings = SCM_CAR (cdr_expr); | |
1414 | if (SCM_NULLP (bindings)) | |
9fbee57e | 1415 | { |
d6754c23 | 1416 | /* no bindings, let* is executed faster */ |
430b8401 | 1417 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1418 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); |
9fbee57e DH |
1419 | } |
1420 | else | |
1421 | { | |
d6754c23 DH |
1422 | SCM rvariables; |
1423 | SCM inits; | |
1424 | SCM new_body; | |
1425 | ||
1426 | check_bindings (bindings, expr); | |
1427 | transform_bindings (bindings, expr, &rvariables, &inits); | |
430b8401 | 1428 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1429 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); |
9fbee57e | 1430 | } |
0f2d19dd JB |
1431 | } |
1432 | ||
73b64342 | 1433 | |
3b88ed2a | 1434 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1435 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1436 | |
1437 | SCM | |
21628685 | 1438 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1439 | { |
21628685 DH |
1440 | const SCM cdr_expr = SCM_CDR (expr); |
1441 | const long length = scm_ilength (cdr_expr); | |
1442 | ||
1443 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1444 | ||
1445 | if (length == 0) | |
1446 | { | |
1447 | /* Special case: (or) is replaced by #f. */ | |
1448 | return SCM_BOOL_F; | |
1449 | } | |
9fbee57e | 1450 | else |
21628685 DH |
1451 | { |
1452 | SCM_SETCAR (expr, SCM_IM_OR); | |
1453 | return expr; | |
1454 | } | |
73b64342 MD |
1455 | } |
1456 | ||
73b64342 | 1457 | |
9fbee57e DH |
1458 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1459 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1460 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1461 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1462 | |
1463 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1464 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1465 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1466 | * nesting level and is known to be greater than zero. */ | |
1467 | static SCM | |
1468 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1469 | { |
9fbee57e | 1470 | if (SCM_CONSP (form)) |
c96d76b8 | 1471 | { |
21628685 | 1472 | const SCM tmp = SCM_CAR (form); |
9fbee57e DH |
1473 | if (SCM_EQ_P (tmp, scm_sym_quasiquote)) |
1474 | { | |
21628685 DH |
1475 | const SCM args = SCM_CDR (form); |
1476 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1477 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1478 | } | |
1479 | else if (SCM_EQ_P (tmp, scm_sym_unquote)) | |
1480 | { | |
21628685 DH |
1481 | const SCM args = SCM_CDR (form); |
1482 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1483 | if (depth - 1 == 0) |
1484 | return scm_eval_car (args, env); | |
1485 | else | |
1486 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1487 | } | |
1488 | else if (SCM_CONSP (tmp) | |
1489 | && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing)) | |
1490 | { | |
21628685 DH |
1491 | const SCM args = SCM_CDR (tmp); |
1492 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1493 | if (depth - 1 == 0) |
1494 | { | |
21628685 DH |
1495 | const SCM list = scm_eval_car (args, env); |
1496 | const SCM rest = SCM_CDR (form); | |
1497 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1498 | s_splicing, list, form); | |
9fbee57e DH |
1499 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1500 | } | |
1501 | else | |
1502 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1503 | iqq (SCM_CDR (form), env, depth)); | |
1504 | } | |
1505 | else | |
1506 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1507 | iqq (SCM_CDR (form), env, depth)); | |
1508 | } | |
1509 | else if (SCM_VECTORP (form)) | |
c96d76b8 | 1510 | { |
9fbee57e DH |
1511 | size_t i = SCM_VECTOR_LENGTH (form); |
1512 | SCM const *const data = SCM_VELTS (form); | |
1513 | SCM tmp = SCM_EOL; | |
1514 | while (i != 0) | |
1515 | tmp = scm_cons (data[--i], tmp); | |
1516 | scm_remember_upto_here_1 (form); | |
1517 | return scm_vector (iqq (tmp, env, depth)); | |
c96d76b8 | 1518 | } |
9fbee57e DH |
1519 | else |
1520 | return form; | |
1521 | } | |
1522 | ||
1523 | SCM | |
21628685 | 1524 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1525 | { |
21628685 DH |
1526 | const SCM cdr_expr = SCM_CDR (expr); |
1527 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1528 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1529 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1530 | } |
1531 | ||
1532 | ||
3b88ed2a | 1533 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1534 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1535 | ||
1536 | SCM | |
21628685 | 1537 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1538 | { |
21628685 DH |
1539 | SCM quotee; |
1540 | ||
1541 | const SCM cdr_expr = SCM_CDR (expr); | |
1542 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1543 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1544 | quotee = SCM_CAR (cdr_expr); | |
5fb64383 | 1545 | if (is_self_quoting_p (quotee)) |
21628685 | 1546 | return quotee; |
e7313a9d | 1547 | |
21628685 | 1548 | SCM_SETCAR (expr, SCM_IM_QUOTE); |
e7313a9d | 1549 | SCM_SETCDR (expr, quotee); |
21628685 | 1550 | return expr; |
9fbee57e DH |
1551 | } |
1552 | ||
e7313a9d DH |
1553 | static SCM |
1554 | unmemoize_quote (const SCM expr, const SCM env SCM_UNUSED) | |
1555 | { | |
1556 | return scm_list_2 (scm_sym_quote, SCM_CDR (expr)); | |
1557 | } | |
1558 | ||
9fbee57e DH |
1559 | |
1560 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1561 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1562 | static const char s_set_x[] = "set!"; |
1563 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1564 | ||
1565 | SCM | |
82b3e2c6 | 1566 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1567 | { |
82b3e2c6 | 1568 | SCM variable; |
36245b66 | 1569 | SCM new_variable; |
82b3e2c6 DH |
1570 | |
1571 | const SCM cdr_expr = SCM_CDR (expr); | |
1572 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1573 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1574 | variable = SCM_CAR (cdr_expr); | |
36245b66 DH |
1575 | |
1576 | /* Memoize the variable form. */ | |
1577 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
1578 | new_variable = lookup_symbol (variable, env); | |
36245b66 DH |
1579 | /* Leave the memoization of unbound symbols to lazy memoization: */ |
1580 | if (SCM_UNBNDP (new_variable)) | |
1581 | new_variable = variable; | |
82b3e2c6 DH |
1582 | |
1583 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
36245b66 | 1584 | SCM_SETCAR (cdr_expr, new_variable); |
82b3e2c6 | 1585 | return expr; |
9fbee57e DH |
1586 | } |
1587 | ||
1588 | ||
1589 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1590 | ||
1591 | ||
3b88ed2a | 1592 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1593 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1594 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1595 | ||
1596 | SCM | |
82b3e2c6 | 1597 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1598 | { |
82b3e2c6 DH |
1599 | const SCM cdr_expr = SCM_CDR (expr); |
1600 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1601 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1602 | |
82b3e2c6 DH |
1603 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1604 | return expr; | |
1605 | } | |
2e171178 | 1606 | |
2e171178 | 1607 | |
3b88ed2a | 1608 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1609 | |
82b3e2c6 DH |
1610 | /* FIXME: The following explanation should go into the documentation: */ |
1611 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1612 | * the global variables named by `var's (symbols, not evaluated), creating | |
1613 | * them if they don't exist, executes body, and then restores the previous | |
1614 | * values of the `var's. Additionally, whenever control leaves body, the | |
1615 | * values of the `var's are saved and restored when control returns. It is an | |
1616 | * error when a symbol appears more than once among the `var's. All `init's | |
1617 | * are evaluated before any `var' is set. | |
1618 | * | |
1619 | * Think of this as `let' for dynamic scope. | |
1620 | */ | |
1621 | ||
1622 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
1623 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
1624 | * | |
1625 | * FIXME - also implement `@bind*'. | |
1626 | */ | |
73b64342 | 1627 | SCM |
82b3e2c6 | 1628 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 1629 | { |
82b3e2c6 DH |
1630 | SCM bindings; |
1631 | SCM rvariables; | |
1632 | SCM inits; | |
1633 | SCM variable_idx; | |
2e171178 | 1634 | |
82b3e2c6 | 1635 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 1636 | |
82b3e2c6 DH |
1637 | const SCM cdr_expr = SCM_CDR (expr); |
1638 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1639 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1640 | bindings = SCM_CAR (cdr_expr); | |
1641 | check_bindings (bindings, expr); | |
1642 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1643 | ||
1644 | for (variable_idx = rvariables; | |
1645 | !SCM_NULLP (variable_idx); | |
1646 | variable_idx = SCM_CDR (variable_idx)) | |
73b64342 | 1647 | { |
82b3e2c6 DH |
1648 | /* The first call to scm_sym2var will look beyond the current module, |
1649 | * while the second call wont. */ | |
1650 | const SCM variable = SCM_CAR (variable_idx); | |
1651 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
1652 | if (SCM_FALSEP (new_variable)) | |
1653 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); | |
1654 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 1655 | } |
82b3e2c6 DH |
1656 | |
1657 | SCM_SETCAR (expr, SCM_IM_BIND); | |
1658 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
1659 | return expr; | |
73b64342 | 1660 | } |
73b64342 | 1661 | |
b0c5d67b | 1662 | |
3b88ed2a | 1663 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
1664 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
1665 | ||
9fbee57e | 1666 | SCM |
da48db62 | 1667 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1668 | { |
da48db62 DH |
1669 | const SCM cdr_expr = SCM_CDR (expr); |
1670 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1671 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1672 | ||
1673 | SCM_SETCAR (expr, SCM_IM_CONT); | |
1674 | return expr; | |
b0c5d67b | 1675 | } |
b0c5d67b DH |
1676 | |
1677 | ||
3b88ed2a | 1678 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 1679 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
1680 | |
1681 | SCM | |
da48db62 | 1682 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1683 | { |
da48db62 DH |
1684 | const SCM cdr_expr = SCM_CDR (expr); |
1685 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1686 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1687 | ||
1688 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
1689 | return expr; | |
b0c5d67b | 1690 | } |
b0c5d67b DH |
1691 | |
1692 | ||
3b88ed2a | 1693 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 1694 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 1695 | |
9fbee57e DH |
1696 | /* Like promises, futures are implemented as closures with an empty |
1697 | * parameter list. Thus, (future <expression>) is transformed into | |
1698 | * (#@future '() <expression>), where the empty list represents the | |
1699 | * empty parameter list. This representation allows for easy creation | |
1700 | * of the closure during evaluation. */ | |
a513ead3 | 1701 | SCM |
8ae95199 | 1702 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 1703 | { |
8ae95199 DH |
1704 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1705 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
1706 | return new_expr; | |
a513ead3 MV |
1707 | } |
1708 | ||
9fbee57e | 1709 | |
3b88ed2a | 1710 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
1711 | SCM_SYMBOL (scm_sym_setter, "setter"); |
1712 | ||
1713 | SCM | |
7893dbbf | 1714 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 1715 | { |
7893dbbf | 1716 | SCM target, exp_target; |
da48db62 DH |
1717 | |
1718 | const SCM cdr_expr = SCM_CDR (expr); | |
1719 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1720 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1721 | ||
1722 | target = SCM_CAR (cdr_expr); | |
1723 | if (!SCM_CONSP (target)) | |
1724 | { | |
1725 | /* R5RS usage */ | |
1726 | return scm_m_set_x (expr, env); | |
1727 | } | |
9fbee57e | 1728 | else |
da48db62 DH |
1729 | { |
1730 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
1731 | /* Macroexpanding the target might return things of the form |
1732 | (begin <atom>). In that case, <atom> must be a symbol or a | |
1733 | variable and we memoize to (set! <atom> ...). | |
1734 | */ | |
1735 | exp_target = scm_macroexp (target, env); | |
1736 | if (SCM_EQ_P (SCM_CAR (exp_target), SCM_IM_BEGIN) | |
1737 | && !SCM_NULLP (SCM_CDR (exp_target)) | |
1738 | && SCM_NULLP (SCM_CDDR (exp_target))) | |
1739 | { | |
1740 | exp_target= SCM_CADR (exp_target); | |
6d1a2e9f MV |
1741 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (exp_target) |
1742 | || SCM_VARIABLEP (exp_target), | |
1743 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
1744 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
1745 | SCM_CDR (cdr_expr))); | |
1746 | } | |
1747 | else | |
1748 | { | |
1749 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
1750 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
1751 | setter_proc_tail); | |
da48db62 | 1752 | |
7893dbbf MV |
1753 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
1754 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
1755 | cddr_expr)); | |
da48db62 | 1756 | |
7893dbbf MV |
1757 | SCM_SETCAR (expr, setter_proc); |
1758 | SCM_SETCDR (expr, setter_args); | |
1759 | return expr; | |
1760 | } | |
da48db62 | 1761 | } |
9fbee57e DH |
1762 | } |
1763 | ||
1764 | ||
a4aa2134 DH |
1765 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
1766 | * soon as the module system allows us to more freely create bindings in | |
1767 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1768 | * moved here. */ | |
9fbee57e | 1769 | SCM |
9a848baf | 1770 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1771 | { |
9a848baf DH |
1772 | SCM slot_nr; |
1773 | ||
1774 | const SCM cdr_expr = SCM_CDR (expr); | |
1775 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1776 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1777 | slot_nr = SCM_CADR (cdr_expr); | |
1778 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
9fbee57e | 1779 | |
9a848baf | 1780 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
e7313a9d | 1781 | SCM_SETCDR (cdr_expr, slot_nr); |
9a848baf DH |
1782 | return expr; |
1783 | } | |
9fbee57e | 1784 | |
9fbee57e | 1785 | |
a4aa2134 DH |
1786 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
1787 | * soon as the module system allows us to more freely create bindings in | |
1788 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1789 | * moved here. */ | |
9fbee57e | 1790 | SCM |
9a848baf | 1791 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1792 | { |
9a848baf DH |
1793 | SCM slot_nr; |
1794 | ||
1795 | const SCM cdr_expr = SCM_CDR (expr); | |
1796 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1797 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
1798 | slot_nr = SCM_CADR (cdr_expr); | |
1799 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
1800 | ||
1801 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
1802 | return expr; | |
9fbee57e | 1803 | } |
9fbee57e DH |
1804 | |
1805 | ||
1806 | #if SCM_ENABLE_ELISP | |
1807 | ||
70c1c108 DH |
1808 | static const char s_defun[] = "Symbol's function definition is void"; |
1809 | ||
3b88ed2a | 1810 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 1811 | |
70c1c108 DH |
1812 | /* nil-cond expressions have the form |
1813 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 1814 | SCM |
70c1c108 | 1815 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1816 | { |
70c1c108 DH |
1817 | const long length = scm_ilength (SCM_CDR (expr)); |
1818 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1819 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
1820 | ||
1821 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
1822 | return expr; | |
9fbee57e DH |
1823 | } |
1824 | ||
1825 | ||
3b88ed2a | 1826 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 1827 | |
70c1c108 DH |
1828 | /* The @fop-macro handles procedure and macro applications for elisp. The |
1829 | * input expression must have the form | |
1830 | * (@fop <var> (transformer-macro <expr> ...)) | |
1831 | * where <var> must be a symbol. The expression is transformed into the | |
1832 | * memoized form of either | |
1833 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
1834 | * if the value of var (across all aliasing) is not a macro, or | |
1835 | * (<un-aliased var> <expr> ...) | |
1836 | * if var is a macro. */ | |
9fbee57e | 1837 | SCM |
70c1c108 | 1838 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1839 | { |
70c1c108 DH |
1840 | SCM location; |
1841 | SCM symbol; | |
1842 | ||
1843 | const SCM cdr_expr = SCM_CDR (expr); | |
1844 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1845 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
1846 | ||
1847 | symbol = SCM_CAR (cdr_expr); | |
1848 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (symbol), s_bad_variable, symbol, expr); | |
1849 | ||
1850 | location = scm_symbol_fref (symbol); | |
1851 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
1852 | ||
1853 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
1854 | * look up such definitions, the chain of symbol definitions has to be | |
1855 | * followed up to the terminal symbol. */ | |
1856 | while (SCM_SYMBOLP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 1857 | { |
70c1c108 DH |
1858 | const SCM alias = SCM_VARIABLE_REF (location); |
1859 | location = scm_symbol_fref (alias); | |
1860 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 1861 | } |
70c1c108 DH |
1862 | |
1863 | /* Memoize the value location belonging to the terminal symbol. */ | |
1864 | SCM_SETCAR (cdr_expr, location); | |
1865 | ||
1866 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 1867 | { |
70c1c108 DH |
1868 | /* Since the location does not contain a macro, the form is a procedure |
1869 | * application. Replace `@fop' by `@apply' and transform the expression | |
1870 | * including the `transformer-macro'. */ | |
1871 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
1872 | return expr; | |
1873 | } | |
1874 | else | |
1875 | { | |
1876 | /* Since the location contains a macro, the arguments should not be | |
1877 | * transformed, so the `transformer-macro' is cut out. The resulting | |
1878 | * expression starts with the memoized variable, that is at the cdr of | |
1879 | * the input expression. */ | |
1880 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
1881 | return cdr_expr; | |
9fbee57e | 1882 | } |
9fbee57e DH |
1883 | } |
1884 | ||
1885 | #endif /* SCM_ENABLE_ELISP */ | |
1886 | ||
1887 | ||
434f2f7a | 1888 | #if (SCM_ENABLE_DEPRECATED == 1) |
f58c472a | 1889 | |
434f2f7a DH |
1890 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ |
1891 | SCM | |
1892 | scm_m_expand_body (SCM exprs, SCM env) | |
1893 | { | |
1894 | scm_c_issue_deprecation_warning | |
1895 | ("`scm_m_expand_body' is deprecated."); | |
1896 | m_expand_body (exprs, env); | |
1897 | return exprs; | |
1898 | } | |
f58c472a | 1899 | |
f58c472a DH |
1900 | |
1901 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
1902 | ||
1903 | SCM | |
70c1c108 | 1904 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 1905 | { |
70c1c108 DH |
1906 | SCM variable; |
1907 | SCM location; | |
1908 | ||
1909 | const SCM cdr_expr = SCM_CDR (expr); | |
1910 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
1911 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1912 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1913 | ||
1914 | variable = SCM_CAR (cdr_expr); | |
1915 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
1916 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); | |
1917 | ASSERT_SYNTAX_2 (!SCM_FALSEP (location) | |
1918 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), | |
1919 | "variable already unbound ", variable, expr); | |
1920 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 1921 | return SCM_UNSPECIFIED; |
f58c472a DH |
1922 | } |
1923 | ||
6f81708a | 1924 | |
26d5b9b4 MD |
1925 | SCM |
1926 | scm_macroexp (SCM x, SCM env) | |
1927 | { | |
86d31dfe | 1928 | SCM res, proc, orig_sym; |
26d5b9b4 MD |
1929 | |
1930 | /* Don't bother to produce error messages here. We get them when we | |
1931 | eventually execute the code for real. */ | |
1932 | ||
1933 | macro_tail: | |
86d31dfe MV |
1934 | orig_sym = SCM_CAR (x); |
1935 | if (!SCM_SYMBOLP (orig_sym)) | |
26d5b9b4 MD |
1936 | return x; |
1937 | ||
26d5b9b4 MD |
1938 | { |
1939 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
1940 | if (proc_ptr == NULL) | |
1941 | { | |
1942 | /* We have lost the race. */ | |
1943 | goto macro_tail; | |
1944 | } | |
1945 | proc = *proc_ptr; | |
1946 | } | |
26d5b9b4 MD |
1947 | |
1948 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
1949 | special forms and should not be evaluated here. */ | |
1950 | ||
3b88ed2a DH |
1951 | if (!SCM_MACROP (proc) |
1952 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
26d5b9b4 MD |
1953 | return x; |
1954 | ||
86d31dfe | 1955 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ |
fdc28395 | 1956 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); |
26d5b9b4 MD |
1957 | |
1958 | if (scm_ilength (res) <= 0) | |
8ea46249 | 1959 | res = scm_list_2 (SCM_IM_BEGIN, res); |
26d5b9b4 | 1960 | |
26d5b9b4 MD |
1961 | SCM_DEFER_INTS; |
1962 | SCM_SETCAR (x, SCM_CAR (res)); | |
1963 | SCM_SETCDR (x, SCM_CDR (res)); | |
1964 | SCM_ALLOW_INTS; | |
1965 | ||
1966 | goto macro_tail; | |
1967 | } | |
73b64342 | 1968 | |
6f81708a DH |
1969 | #endif |
1970 | ||
1971 | /*****************************************************************************/ | |
1972 | /*****************************************************************************/ | |
1973 | /* The definitions for unmemoization start here. */ | |
1974 | /*****************************************************************************/ | |
1975 | /*****************************************************************************/ | |
1976 | ||
a44a9715 DH |
1977 | #define SCM_BIT7(x) (127 & SCM_UNPACK (x)) |
1978 | ||
6f81708a | 1979 | SCM_SYMBOL (sym_three_question_marks, "???"); |
a44a9715 | 1980 | |
60a49842 | 1981 | |
6dbd0af5 MD |
1982 | /* scm_unmemocopy takes a memoized expression together with its |
1983 | * environment and rewrites it to its original form. Thus, it is the | |
1984 | * inversion of the rewrite rules above. The procedure is not | |
1985 | * optimized for speed. It's used in scm_iprin1 when printing the | |
220ff1eb MD |
1986 | * code of a closure, in scm_procedure_source, in display_frame when |
1987 | * generating the source for a stackframe in a backtrace, and in | |
1988 | * display_expression. | |
86d31dfe | 1989 | * |
c96d76b8 | 1990 | * Unmemoizing is not a reliable process. You cannot in general |
86d31dfe MV |
1991 | * expect to get the original source back. |
1992 | * | |
1993 | * However, GOOPS currently relies on this for method compilation. | |
1994 | * This ought to change. | |
26d5b9b4 MD |
1995 | */ |
1996 | ||
8ea46249 | 1997 | static SCM |
60a49842 | 1998 | build_binding_list (SCM rnames, SCM rinits) |
8ea46249 DH |
1999 | { |
2000 | SCM bindings = SCM_EOL; | |
60a49842 | 2001 | while (!SCM_NULLP (rnames)) |
8ea46249 | 2002 | { |
60a49842 | 2003 | SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); |
8ea46249 | 2004 | bindings = scm_cons (binding, bindings); |
60a49842 DH |
2005 | rnames = SCM_CDR (rnames); |
2006 | rinits = SCM_CDR (rinits); | |
8ea46249 DH |
2007 | } |
2008 | return bindings; | |
2009 | } | |
2010 | ||
60a49842 | 2011 | |
6f81708a DH |
2012 | static SCM |
2013 | unmemocar (SCM form, SCM env) | |
60a49842 DH |
2014 | { |
2015 | if (!SCM_CONSP (form)) | |
2016 | return form; | |
2017 | else | |
2018 | { | |
2019 | SCM c = SCM_CAR (form); | |
2020 | if (SCM_VARIABLEP (c)) | |
2021 | { | |
2022 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
2023 | if (SCM_FALSEP (sym)) | |
2024 | sym = sym_three_question_marks; | |
2025 | SCM_SETCAR (form, sym); | |
2026 | } | |
2027 | else if (SCM_ILOCP (c)) | |
2028 | { | |
2029 | unsigned long int ir; | |
2030 | ||
2031 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2032 | env = SCM_CDR (env); | |
2033 | env = SCM_CAAR (env); | |
2034 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2035 | env = SCM_CDR (env); | |
f62b9dff | 2036 | |
60a49842 DH |
2037 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2038 | } | |
2039 | return form; | |
2040 | } | |
2041 | } | |
2042 | ||
6f81708a | 2043 | |
6bff1368 DH |
2044 | SCM |
2045 | scm_unmemocopy (SCM x, SCM env) | |
6dbd0af5 MD |
2046 | { |
2047 | SCM ls, z; | |
6dbd0af5 | 2048 | SCM p; |
21628685 DH |
2049 | |
2050 | if (SCM_VECTORP (x)) | |
2051 | { | |
2052 | return scm_list_2 (scm_sym_quote, x); | |
2053 | } | |
2054 | else if (!SCM_CONSP (x)) | |
6dbd0af5 | 2055 | return x; |
21628685 | 2056 | |
6dbd0af5 | 2057 | p = scm_whash_lookup (scm_source_whash, x); |
0e7bb795 | 2058 | if (SCM_ISYMP (SCM_CAR (x))) |
6dbd0af5 | 2059 | { |
7e6e6b37 | 2060 | switch (ISYMNUM (SCM_CAR (x))) |
0e7bb795 | 2061 | { |
7e6e6b37 | 2062 | case (ISYMNUM (SCM_IM_AND)): |
0e7bb795 DH |
2063 | ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED); |
2064 | break; | |
7e6e6b37 | 2065 | case (ISYMNUM (SCM_IM_BEGIN)): |
0e7bb795 DH |
2066 | ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED); |
2067 | break; | |
7e6e6b37 | 2068 | case (ISYMNUM (SCM_IM_CASE)): |
0e7bb795 DH |
2069 | ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED); |
2070 | break; | |
7e6e6b37 | 2071 | case (ISYMNUM (SCM_IM_COND)): |
0e7bb795 DH |
2072 | ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED); |
2073 | break; | |
7e6e6b37 | 2074 | case (ISYMNUM (SCM_IM_DO)): |
0e7bb795 DH |
2075 | { |
2076 | /* format: (#@do (i1 ... ik) (nk ... n1) (test) (body) s1 ... sk), | |
2077 | * where ix is an initializer for a local variable, nx is the name | |
2078 | * of the local variable, test is the test clause of the do loop, | |
2079 | * body is the body of the do loop and sx are the step clauses for | |
2080 | * the local variables. */ | |
2081 | SCM names, inits, test, memoized_body, steps, bindings; | |
2082 | ||
2083 | x = SCM_CDR (x); | |
2084 | inits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); | |
2085 | x = SCM_CDR (x); | |
2086 | names = SCM_CAR (x); | |
2087 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); | |
2088 | x = SCM_CDR (x); | |
2089 | test = scm_unmemocopy (SCM_CAR (x), env); | |
2090 | x = SCM_CDR (x); | |
2091 | memoized_body = SCM_CAR (x); | |
2092 | x = SCM_CDR (x); | |
2093 | steps = scm_reverse (scm_unmemocopy (x, env)); | |
2094 | ||
2095 | /* build transformed binding list */ | |
2096 | bindings = SCM_EOL; | |
2097 | while (!SCM_NULLP (names)) | |
2098 | { | |
2099 | SCM name = SCM_CAR (names); | |
2100 | SCM init = SCM_CAR (inits); | |
2101 | SCM step = SCM_CAR (steps); | |
2102 | step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step); | |
2103 | ||
2104 | bindings = scm_cons (scm_cons2 (name, init, step), bindings); | |
2105 | ||
2106 | names = SCM_CDR (names); | |
2107 | inits = SCM_CDR (inits); | |
2108 | steps = SCM_CDR (steps); | |
2109 | } | |
2110 | z = scm_cons (test, SCM_UNSPECIFIED); | |
2111 | ls = scm_cons2 (scm_sym_do, bindings, z); | |
2112 | ||
2113 | x = scm_cons (SCM_BOOL_F, memoized_body); | |
2114 | break; | |
2115 | } | |
7e6e6b37 | 2116 | case (ISYMNUM (SCM_IM_IF)): |
0e7bb795 DH |
2117 | ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED); |
2118 | break; | |
7e6e6b37 | 2119 | case (ISYMNUM (SCM_IM_LET)): |
0e7bb795 DH |
2120 | { |
2121 | /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...), | |
2122 | * where nx is the name of a local variable, ix is an initializer | |
2123 | * for the local variable and by are the body clauses. */ | |
2124 | SCM rnames, rinits, bindings; | |
2125 | ||
2126 | x = SCM_CDR (x); | |
2127 | rnames = SCM_CAR (x); | |
2128 | x = SCM_CDR (x); | |
2129 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); | |
2130 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
2131 | ||
2132 | bindings = build_binding_list (rnames, rinits); | |
2133 | z = scm_cons (bindings, SCM_UNSPECIFIED); | |
05b15362 | 2134 | ls = scm_cons (scm_sym_let, z); |
0e7bb795 DH |
2135 | break; |
2136 | } | |
7e6e6b37 | 2137 | case (ISYMNUM (SCM_IM_LETREC)): |
0e7bb795 DH |
2138 | { |
2139 | /* format: (#@letrec (vn ... v2 v1) (i1 i2 ... in) b1 ...), | |
2140 | * where vx is the name of a local variable, ix is an initializer | |
2141 | * for the local variable and by are the body clauses. */ | |
2142 | SCM rnames, rinits, bindings; | |
2143 | ||
2144 | x = SCM_CDR (x); | |
2145 | rnames = SCM_CAR (x); | |
2146 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
2147 | x = SCM_CDR (x); | |
2148 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); | |
2149 | ||
2150 | bindings = build_binding_list (rnames, rinits); | |
2151 | z = scm_cons (bindings, SCM_UNSPECIFIED); | |
2152 | ls = scm_cons (scm_sym_letrec, z); | |
2153 | break; | |
2154 | } | |
7e6e6b37 | 2155 | case (ISYMNUM (SCM_IM_LETSTAR)): |
0e7bb795 DH |
2156 | { |
2157 | SCM b, y; | |
2158 | x = SCM_CDR (x); | |
2159 | b = SCM_CAR (x); | |
2160 | y = SCM_EOL; | |
2161 | if (SCM_NULLP (b)) | |
2162 | { | |
2163 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); | |
2164 | } | |
2165 | else | |
2166 | { | |
2167 | SCM copy = scm_unmemocopy (SCM_CADR (b), env); | |
2168 | SCM initializer = unmemocar (scm_list_1 (copy), env); | |
2169 | y = z = scm_acons (SCM_CAR (b), initializer, SCM_UNSPECIFIED); | |
2170 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); | |
2171 | b = SCM_CDDR (b); | |
2172 | if (SCM_NULLP (b)) | |
2173 | { | |
2174 | SCM_SETCDR (y, SCM_EOL); | |
2175 | z = scm_cons (y, SCM_UNSPECIFIED); | |
2176 | ls = scm_cons (scm_sym_let, z); | |
2177 | break; | |
2178 | } | |
2179 | do | |
2180 | { | |
2181 | copy = scm_unmemocopy (SCM_CADR (b), env); | |
2182 | initializer = unmemocar (scm_list_1 (copy), env); | |
2183 | SCM_SETCDR (z, scm_acons (SCM_CAR (b), | |
b1cb24ff | 2184 | initializer, |
0e7bb795 DH |
2185 | SCM_UNSPECIFIED)); |
2186 | z = SCM_CDR (z); | |
2187 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); | |
2188 | b = SCM_CDDR (b); | |
2189 | } | |
2190 | while (!SCM_NULLP (b)); | |
2191 | SCM_SETCDR (z, SCM_EOL); | |
2192 | } | |
2193 | z = scm_cons (y, SCM_UNSPECIFIED); | |
2194 | ls = scm_cons (scm_sym_letstar, z); | |
2195 | break; | |
2196 | } | |
7e6e6b37 | 2197 | case (ISYMNUM (SCM_IM_OR)): |
0e7bb795 DH |
2198 | ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED); |
2199 | break; | |
7e6e6b37 | 2200 | case (ISYMNUM (SCM_IM_LAMBDA)): |
0e7bb795 DH |
2201 | x = SCM_CDR (x); |
2202 | z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED); | |
2203 | ls = scm_cons (scm_sym_lambda, z); | |
2204 | env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env); | |
2205 | break; | |
e7313a9d | 2206 | |
7e6e6b37 | 2207 | case (ISYMNUM (SCM_IM_QUOTE)): |
e7313a9d DH |
2208 | return unmemoize_quote (x, env); |
2209 | ||
7e6e6b37 | 2210 | case (ISYMNUM (SCM_IM_SET_X)): |
0e7bb795 DH |
2211 | ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED); |
2212 | break; | |
7e6e6b37 | 2213 | case (ISYMNUM (SCM_IM_APPLY)): |
2f0d1375 | 2214 | ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED); |
0e7bb795 | 2215 | break; |
7e6e6b37 | 2216 | case (ISYMNUM (SCM_IM_CONT)): |
2f0d1375 | 2217 | ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED); |
0e7bb795 | 2218 | break; |
7e6e6b37 | 2219 | case (ISYMNUM (SCM_IM_DELAY)): |
a570e93a MD |
2220 | ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED); |
2221 | x = SCM_CDR (x); | |
0e7bb795 | 2222 | break; |
7e6e6b37 | 2223 | case (ISYMNUM (SCM_IM_FUTURE)): |
ebf9b47c | 2224 | ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED); |
28d52ebb | 2225 | x = SCM_CDR (x); |
0e7bb795 | 2226 | break; |
7e6e6b37 | 2227 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 2228 | ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED); |
0e7bb795 | 2229 | break; |
7e6e6b37 | 2230 | case (ISYMNUM (SCM_IM_ELSE)): |
2a6f7afe | 2231 | ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED); |
0e7bb795 DH |
2232 | break; |
2233 | default: | |
2234 | ls = z = unmemocar (scm_cons (scm_unmemocopy (SCM_CAR (x), env), | |
2235 | SCM_UNSPECIFIED), | |
2236 | env); | |
2237 | } | |
2238 | } | |
2239 | else | |
2240 | { | |
6bff1368 | 2241 | ls = z = unmemocar (scm_cons (scm_unmemocopy (SCM_CAR (x), env), |
6dbd0af5 MD |
2242 | SCM_UNSPECIFIED), |
2243 | env); | |
2244 | } | |
0e7bb795 | 2245 | |
8c494e99 DH |
2246 | x = SCM_CDR (x); |
2247 | while (SCM_CONSP (x)) | |
a23afe53 | 2248 | { |
8c494e99 DH |
2249 | SCM form = SCM_CAR (x); |
2250 | if (!SCM_ISYMP (form)) | |
2251 | { | |
6bff1368 | 2252 | SCM copy = scm_cons (scm_unmemocopy (form, env), SCM_UNSPECIFIED); |
8c494e99 DH |
2253 | SCM_SETCDR (z, unmemocar (copy, env)); |
2254 | z = SCM_CDR (z); | |
2255 | } | |
609a8b86 DH |
2256 | else if (SCM_EQ_P (form, SCM_IM_ARROW)) |
2257 | { | |
2258 | SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED)); | |
2259 | z = SCM_CDR (z); | |
2260 | } | |
8c494e99 | 2261 | x = SCM_CDR (x); |
a23afe53 MD |
2262 | } |
2263 | SCM_SETCDR (z, x); | |
01f11e02 | 2264 | if (!SCM_FALSEP (p)) |
6dbd0af5 | 2265 | scm_whash_insert (scm_source_whash, ls, p); |
6dbd0af5 MD |
2266 | return ls; |
2267 | } | |
2268 | ||
1cc91f1b | 2269 | |
434f2f7a DH |
2270 | #if (SCM_ENABLE_DEPRECATED == 1) |
2271 | ||
2272 | SCM | |
2273 | scm_unmemocar (SCM form, SCM env) | |
2274 | { | |
2275 | return unmemocar (form, env); | |
2276 | } | |
2277 | ||
2278 | #endif | |
2279 | ||
6f81708a DH |
2280 | /*****************************************************************************/ |
2281 | /*****************************************************************************/ | |
2282 | /* The definitions for execution start here. */ | |
2283 | /*****************************************************************************/ | |
2284 | /*****************************************************************************/ | |
2285 | ||
2286 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2287 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2288 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2289 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
2290 | ||
2291 | /* A function object to implement "apply" for non-closure functions. */ | |
2292 | static SCM f_apply; | |
2293 | /* An endless list consisting of #<undefined> objects: */ | |
2294 | static SCM undefineds; | |
2295 | ||
2296 | ||
2297 | int | |
6e8d25a6 | 2298 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2299 | { |
6a0f6ff3 | 2300 | while (!SCM_NULLP (formals)) |
0f2d19dd | 2301 | { |
01f11e02 | 2302 | if (!SCM_CONSP (formals)) |
ff467021 | 2303 | return 0; |
6a0f6ff3 | 2304 | if (SCM_NULLP (args)) |
ff467021 | 2305 | return 1; |
0f2d19dd JB |
2306 | formals = SCM_CDR (formals); |
2307 | args = SCM_CDR (args); | |
2308 | } | |
01f11e02 | 2309 | return !SCM_NULLP (args) ? 1 : 0; |
0f2d19dd | 2310 | } |
a392ee15 | 2311 | |
0f2d19dd | 2312 | \f |
62360b89 | 2313 | |
434f2f7a DH |
2314 | /* The evaluator contains a plethora of EVAL symbols. This is an attempt at |
2315 | * explanation. | |
62360b89 | 2316 | * |
434f2f7a DH |
2317 | * The following macros should be used in code which is read twice (where the |
2318 | * choice of evaluator is hard soldered): | |
62360b89 | 2319 | * |
434f2f7a DH |
2320 | * CEVAL is the symbol used within one evaluator to call itself. |
2321 | * Originally, it is defined to ceval, but is redefined to deval during the | |
2322 | * second pass. | |
62360b89 DH |
2323 | * |
2324 | * SCM_EVALIM is used when it is known that the expression is an | |
2325 | * immediate. (This macro never calls an evaluator.) | |
434f2f7a DH |
2326 | * |
2327 | * EVAL evaluates an expression that is expected to have its symbols already | |
2328 | * memoized. Expressions that are not of the form '(<form> <form> ...)' are | |
2329 | * evaluated inline without calling an evaluator. | |
2330 | * | |
2331 | * EVALCAR evaluates the car of an expression 'X:(Y:<form> <form> ...)', | |
2332 | * potentially replacing a symbol at the position Y:<form> by its memoized | |
2333 | * variable. If Y:<form> is not of the form '(<form> <form> ...)', the | |
2334 | * evaluation is performed inline without calling an evaluator. | |
62360b89 DH |
2335 | * |
2336 | * The following macros should be used in code which is read once | |
2337 | * (where the choice of evaluator is dynamic): | |
2338 | * | |
434f2f7a DH |
2339 | * SCM_XEVAL corresponds to EVAL, but uses ceval *or* deval depending on the |
2340 | * debugging mode. | |
62360b89 | 2341 | * |
434f2f7a DH |
2342 | * SCM_XEVALCAR corresponds to EVALCAR, but uses ceval *or* deval depending |
2343 | * on the debugging mode. | |
62360b89 DH |
2344 | * |
2345 | * The main motivation for keeping this plethora is efficiency | |
2346 | * together with maintainability (=> locality of code). | |
2347 | */ | |
2348 | ||
434f2f7a DH |
2349 | static SCM ceval (SCM x, SCM env); |
2350 | static SCM deval (SCM x, SCM env); | |
2351 | #define CEVAL ceval | |
2352 | ||
62360b89 DH |
2353 | |
2354 | #define SCM_EVALIM2(x) \ | |
2355 | ((SCM_EQ_P ((x), SCM_EOL) \ | |
2356 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ | |
2357 | : 0), \ | |
2358 | (x)) | |
2359 | ||
2360 | #define SCM_EVALIM(x, env) (SCM_ILOCP (x) \ | |
434f2f7a | 2361 | ? *scm_ilookup ((x), (env)) \ |
62360b89 DH |
2362 | : SCM_EVALIM2(x)) |
2363 | ||
434f2f7a DH |
2364 | #define SCM_XEVAL(x, env) \ |
2365 | (SCM_IMP (x) \ | |
2366 | ? SCM_EVALIM2 (x) \ | |
2367 | : (SCM_VARIABLEP (x) \ | |
2368 | ? SCM_VARIABLE_REF (x) \ | |
2369 | : (SCM_CONSP (x) \ | |
2370 | ? (scm_debug_mode_p \ | |
2371 | ? deval ((x), (env)) \ | |
2372 | : ceval ((x), (env))) \ | |
2373 | : (x)))) | |
2374 | ||
2375 | #define SCM_XEVALCAR(x, env) \ | |
2376 | (SCM_IMP (SCM_CAR (x)) \ | |
2377 | ? SCM_EVALIM (SCM_CAR (x), (env)) \ | |
2378 | : (SCM_VARIABLEP (SCM_CAR (x)) \ | |
2379 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
2380 | : (SCM_CONSP (SCM_CAR (x)) \ | |
2381 | ? (scm_debug_mode_p \ | |
2382 | ? deval (SCM_CAR (x), (env)) \ | |
2383 | : ceval (SCM_CAR (x), (env))) \ | |
2384 | : (!SCM_SYMBOLP (SCM_CAR (x)) \ | |
2385 | ? SCM_CAR (x) \ | |
2386 | : *scm_lookupcar ((x), (env), 1))))) | |
2387 | ||
2388 | #define EVAL(x, env) \ | |
2389 | (SCM_IMP (x) \ | |
2390 | ? SCM_EVALIM ((x), (env)) \ | |
2391 | : (SCM_VARIABLEP (x) \ | |
2392 | ? SCM_VARIABLE_REF (x) \ | |
2393 | : (SCM_CONSP (x) \ | |
2394 | ? CEVAL ((x), (env)) \ | |
2395 | : (x)))) | |
2396 | ||
2397 | #define EVALCAR(x, env) \ | |
2398 | (SCM_IMP (SCM_CAR (x)) \ | |
2399 | ? SCM_EVALIM (SCM_CAR (x), (env)) \ | |
2400 | : (SCM_VARIABLEP (SCM_CAR (x)) \ | |
2401 | ? SCM_VARIABLE_REF (SCM_CAR (x)) \ | |
2402 | : (SCM_CONSP (SCM_CAR (x)) \ | |
2403 | ? CEVAL (SCM_CAR (x), (env)) \ | |
2404 | : (!SCM_SYMBOLP (SCM_CAR (x)) \ | |
2405 | ? SCM_CAR (x) \ | |
2406 | : *scm_lookupcar ((x), (env), 1))))) | |
62360b89 DH |
2407 | |
2408 | SCM_REC_MUTEX (source_mutex); | |
2409 | ||
2410 | ||
e5156567 DH |
2411 | /* Lookup a given local variable in an environment. The local variable is |
2412 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
2413 | * indicates the relative number of the environment frame (counting upwards | |
2414 | * from the innermost environment frame), binding indicates the number of the | |
2415 | * binding within the frame, and last? (which is extracted from the iloc using | |
2416 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
2417 | * very end of the improper list of bindings. */ | |
2418 | SCM * | |
2419 | scm_ilookup (SCM iloc, SCM env) | |
2420 | { | |
2421 | unsigned int frame_nr = SCM_IFRAME (iloc); | |
2422 | unsigned int binding_nr = SCM_IDIST (iloc); | |
2423 | SCM frames = env; | |
2424 | SCM bindings; | |
2425 | ||
2426 | for (; 0 != frame_nr; --frame_nr) | |
2427 | frames = SCM_CDR (frames); | |
2428 | ||
2429 | bindings = SCM_CAR (frames); | |
2430 | for (; 0 != binding_nr; --binding_nr) | |
2431 | bindings = SCM_CDR (bindings); | |
2432 | ||
2433 | if (SCM_ICDRP (iloc)) | |
2434 | return SCM_CDRLOC (bindings); | |
2435 | return SCM_CARLOC (SCM_CDR (bindings)); | |
2436 | } | |
2437 | ||
2438 | ||
2439 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); | |
2440 | ||
2441 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
2442 | static void | |
2443 | error_unbound_variable (SCM symbol) | |
2444 | { | |
2445 | scm_error (scm_unbound_variable_key, NULL, | |
2446 | "Unbound variable: ~S", | |
2447 | scm_list_1 (symbol), SCM_BOOL_F); | |
2448 | } | |
2449 | ||
2450 | ||
2451 | /* The Lookup Car Race | |
2452 | - by Eva Luator | |
2453 | ||
2454 | Memoization of variables and special forms is done while executing | |
2455 | the code for the first time. As long as there is only one thread | |
2456 | everything is fine, but as soon as two threads execute the same | |
2457 | code concurrently `for the first time' they can come into conflict. | |
2458 | ||
2459 | This memoization includes rewriting variable references into more | |
2460 | efficient forms and expanding macros. Furthermore, macro expansion | |
2461 | includes `compiling' special forms like `let', `cond', etc. into | |
2462 | tree-code instructions. | |
2463 | ||
2464 | There shouldn't normally be a problem with memoizing local and | |
2465 | global variable references (into ilocs and variables), because all | |
2466 | threads will mutate the code in *exactly* the same way and (if I | |
2467 | read the C code correctly) it is not possible to observe a half-way | |
2468 | mutated cons cell. The lookup procedure can handle this | |
2469 | transparently without any critical sections. | |
2470 | ||
2471 | It is different with macro expansion, because macro expansion | |
2472 | happens outside of the lookup procedure and can't be | |
2473 | undone. Therefore the lookup procedure can't cope with it. It has | |
2474 | to indicate failure when it detects a lost race and hope that the | |
2475 | caller can handle it. Luckily, it turns out that this is the case. | |
2476 | ||
2477 | An example to illustrate this: Suppose that the following form will | |
2478 | be memoized concurrently by two threads | |
2479 | ||
2480 | (let ((x 12)) x) | |
2481 | ||
2482 | Let's first examine the lookup of X in the body. The first thread | |
2483 | decides that it has to find the symbol "x" in the environment and | |
2484 | starts to scan it. Then the other thread takes over and actually | |
2485 | overtakes the first. It looks up "x" and substitutes an | |
2486 | appropriate iloc for it. Now the first thread continues and | |
2487 | completes its lookup. It comes to exactly the same conclusions as | |
2488 | the second one and could - without much ado - just overwrite the | |
2489 | iloc with the same iloc. | |
2490 | ||
2491 | But let's see what will happen when the race occurs while looking | |
2492 | up the symbol "let" at the start of the form. It could happen that | |
2493 | the second thread interrupts the lookup of the first thread and not | |
2494 | only substitutes a variable for it but goes right ahead and | |
2495 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
2496 | the first thread completes its lookup, it would replace the #@let* | |
2497 | with a variable containing the "let" binding, effectively reverting | |
2498 | the form to (let (x 12) x). This is wrong. It has to detect that | |
2499 | it has lost the race and the evaluator has to reconsider the | |
2500 | changed form completely. | |
2501 | ||
2502 | This race condition could be resolved with some kind of traffic | |
2503 | light (like mutexes) around scm_lookupcar, but I think that it is | |
2504 | best to avoid them in this case. They would serialize memoization | |
2505 | completely and because lookup involves calling arbitrary Scheme | |
2506 | code (via the lookup-thunk), threads could be blocked for an | |
2507 | arbitrary amount of time or even deadlock. But with the current | |
2508 | solution a lot of unnecessary work is potentially done. */ | |
2509 | ||
2510 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to | |
2511 | return NULL to indicate a failed lookup due to some race conditions | |
2512 | between threads. This only happens when VLOC is the first cell of | |
2513 | a special form that will eventually be memoized (like `let', etc.) | |
2514 | In that case the whole lookup is bogus and the caller has to | |
2515 | reconsider the complete special form. | |
2516 | ||
2517 | SCM_LOOKUPCAR is still there, of course. It just calls | |
2518 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR | |
2519 | should only be called when it is known that VLOC is not the first | |
2520 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
2521 | for NULL. I think I've found the only places where this | |
2522 | applies. */ | |
2523 | ||
2524 | static SCM * | |
2525 | scm_lookupcar1 (SCM vloc, SCM genv, int check) | |
2526 | { | |
2527 | SCM env = genv; | |
2528 | register SCM *al, fl, var = SCM_CAR (vloc); | |
2529 | register SCM iloc = SCM_ILOC00; | |
2530 | for (; SCM_NIMP (env); env = SCM_CDR (env)) | |
2531 | { | |
2532 | if (!SCM_CONSP (SCM_CAR (env))) | |
2533 | break; | |
2534 | al = SCM_CARLOC (env); | |
2535 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) | |
2536 | { | |
2537 | if (!SCM_CONSP (fl)) | |
2538 | { | |
2539 | if (SCM_EQ_P (fl, var)) | |
2540 | { | |
2541 | if (! SCM_EQ_P (SCM_CAR (vloc), var)) | |
2542 | goto race; | |
2543 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); | |
2544 | return SCM_CDRLOC (*al); | |
2545 | } | |
2546 | else | |
2547 | break; | |
2548 | } | |
2549 | al = SCM_CDRLOC (*al); | |
2550 | if (SCM_EQ_P (SCM_CAR (fl), var)) | |
2551 | { | |
2552 | if (SCM_UNBNDP (SCM_CAR (*al))) | |
2553 | { | |
2554 | env = SCM_EOL; | |
2555 | goto errout; | |
2556 | } | |
2557 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) | |
2558 | goto race; | |
2559 | SCM_SETCAR (vloc, iloc); | |
2560 | return SCM_CARLOC (*al); | |
2561 | } | |
2562 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); | |
2563 | } | |
2564 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); | |
2565 | } | |
2566 | { | |
2567 | SCM top_thunk, real_var; | |
2568 | if (SCM_NIMP (env)) | |
2569 | { | |
2570 | top_thunk = SCM_CAR (env); /* env now refers to a | |
2571 | top level env thunk */ | |
2572 | env = SCM_CDR (env); | |
2573 | } | |
2574 | else | |
2575 | top_thunk = SCM_BOOL_F; | |
2576 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); | |
2577 | if (SCM_FALSEP (real_var)) | |
2578 | goto errout; | |
2579 | ||
2580 | if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) | |
2581 | { | |
2582 | errout: | |
2583 | if (check) | |
2584 | { | |
2585 | if (SCM_NULLP (env)) | |
2586 | error_unbound_variable (var); | |
2587 | else | |
2588 | scm_misc_error (NULL, "Damaged environment: ~S", | |
2589 | scm_list_1 (var)); | |
2590 | } | |
2591 | else | |
2592 | { | |
2593 | /* A variable could not be found, but we shall | |
2594 | not throw an error. */ | |
2595 | static SCM undef_object = SCM_UNDEFINED; | |
2596 | return &undef_object; | |
2597 | } | |
2598 | } | |
2599 | ||
2600 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) | |
2601 | { | |
2602 | /* Some other thread has changed the very cell we are working | |
2603 | on. In effect, it must have done our job or messed it up | |
2604 | completely. */ | |
2605 | race: | |
2606 | var = SCM_CAR (vloc); | |
2607 | if (SCM_VARIABLEP (var)) | |
2608 | return SCM_VARIABLE_LOC (var); | |
2609 | if (SCM_ILOCP (var)) | |
2610 | return scm_ilookup (var, genv); | |
2611 | /* We can't cope with anything else than variables and ilocs. When | |
2612 | a special form has been memoized (i.e. `let' into `#@let') we | |
2613 | return NULL and expect the calling function to do the right | |
2614 | thing. For the evaluator, this means going back and redoing | |
2615 | the dispatch on the car of the form. */ | |
2616 | return NULL; | |
2617 | } | |
2618 | ||
2619 | SCM_SETCAR (vloc, real_var); | |
2620 | return SCM_VARIABLE_LOC (real_var); | |
2621 | } | |
2622 | } | |
2623 | ||
2624 | SCM * | |
2625 | scm_lookupcar (SCM vloc, SCM genv, int check) | |
2626 | { | |
2627 | SCM *loc = scm_lookupcar1 (vloc, genv, check); | |
2628 | if (loc == NULL) | |
2629 | abort (); | |
2630 | return loc; | |
2631 | } | |
2632 | ||
2633 | ||
36245b66 DH |
2634 | /* During execution, look up a symbol in the top level of the given local |
2635 | * environment and return the corresponding variable object. If no binding | |
2636 | * for the symbol can be found, an 'Unbound variable' error is signalled. */ | |
2637 | static SCM | |
2638 | lazy_memoize_variable (const SCM symbol, const SCM environment) | |
2639 | { | |
2640 | const SCM top_level = scm_env_top_level (environment); | |
2641 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
2642 | ||
2643 | if (SCM_FALSEP (variable)) | |
2644 | error_unbound_variable (symbol); | |
2645 | else | |
2646 | return variable; | |
2647 | } | |
2648 | ||
2649 | ||
62360b89 DH |
2650 | SCM |
2651 | scm_eval_car (SCM pair, SCM env) | |
2652 | { | |
2653 | return SCM_XEVALCAR (pair, env); | |
2654 | } | |
2655 | ||
2656 | ||
6dbd0af5 | 2657 | SCM |
6e8d25a6 | 2658 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2659 | { |
680ed4a8 | 2660 | SCM results = SCM_EOL, *lloc = &results, res; |
904a077d | 2661 | while (SCM_CONSP (l)) |
6dbd0af5 | 2662 | { |
680ed4a8 | 2663 | res = EVALCAR (l, env); |
904a077d | 2664 | |
8ea46249 | 2665 | *lloc = scm_list_1 (res); |
a23afe53 | 2666 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2667 | l = SCM_CDR (l); |
2668 | } | |
22a52da1 | 2669 | if (!SCM_NULLP (l)) |
904a077d | 2670 | scm_wrong_num_args (proc); |
680ed4a8 | 2671 | return results; |
6dbd0af5 | 2672 | } |
c4ac4d88 | 2673 | |
d0b07b5d | 2674 | |
9de33deb MD |
2675 | SCM |
2676 | scm_eval_body (SCM code, SCM env) | |
2677 | { | |
2678 | SCM next; | |
434f2f7a | 2679 | |
9de33deb | 2680 | again: |
01f11e02 DH |
2681 | next = SCM_CDR (code); |
2682 | while (!SCM_NULLP (next)) | |
9de33deb MD |
2683 | { |
2684 | if (SCM_IMP (SCM_CAR (code))) | |
2685 | { | |
2686 | if (SCM_ISYMP (SCM_CAR (code))) | |
2687 | { | |
28d52ebb | 2688 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2689 | /* check for race condition */ |
2690 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2691 | m_expand_body (code, env); |
28d52ebb | 2692 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2693 | goto again; |
2694 | } | |
2695 | } | |
2696 | else | |
2697 | SCM_XEVAL (SCM_CAR (code), env); | |
2698 | code = next; | |
01f11e02 | 2699 | next = SCM_CDR (code); |
9de33deb MD |
2700 | } |
2701 | return SCM_XEVALCAR (code, env); | |
2702 | } | |
2703 | ||
0f2d19dd JB |
2704 | #endif /* !DEVAL */ |
2705 | ||
6dbd0af5 MD |
2706 | |
2707 | /* SECTION: This code is specific for the debugging support. One | |
2708 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2709 | * defined. | |
2710 | */ | |
2711 | ||
2712 | #ifndef DEVAL | |
2713 | ||
2714 | #define SCM_APPLY scm_apply | |
2715 | #define PREP_APPLY(proc, args) | |
2716 | #define ENTER_APPLY | |
ddea3325 | 2717 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2718 | #ifdef STACK_CHECKING |
2719 | #ifndef NO_CEVAL_STACK_CHECKING | |
2720 | #define EVAL_STACK_CHECKING | |
2721 | #endif | |
6dbd0af5 MD |
2722 | #endif |
2723 | ||
2724 | #else /* !DEVAL */ | |
2725 | ||
434f2f7a DH |
2726 | #undef CEVAL |
2727 | #define CEVAL deval /* Substitute all uses of ceval */ | |
2728 | ||
0f2d19dd JB |
2729 | #undef SCM_APPLY |
2730 | #define SCM_APPLY scm_dapply | |
434f2f7a | 2731 | |
6dbd0af5 MD |
2732 | #undef PREP_APPLY |
2733 | #define PREP_APPLY(p, l) \ | |
2734 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
434f2f7a | 2735 | |
6dbd0af5 MD |
2736 | #undef ENTER_APPLY |
2737 | #define ENTER_APPLY \ | |
d3a6bc94 | 2738 | do { \ |
b7ff98dd | 2739 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2740 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2741 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2742 | {\ |
156dcb09 | 2743 | SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2744 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2745 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2746 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2747 | {\ |
c0ab1b8d | 2748 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 2749 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 2750 | }\ |
6dbd0af5 MD |
2751 | else\ |
2752 | {\ | |
5f144b10 GH |
2753 | int first;\ |
2754 | tmp = scm_make_continuation (&first);\ | |
2755 | if (first)\ | |
d95c0b76 | 2756 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 2757 | }\ |
d95c0b76 | 2758 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 2759 | }\ |
d3a6bc94 | 2760 | } while (0) |
434f2f7a | 2761 | |
0f2d19dd | 2762 | #undef RETURN |
ddea3325 | 2763 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
434f2f7a | 2764 | |
b7ff98dd MD |
2765 | #ifdef STACK_CHECKING |
2766 | #ifndef EVAL_STACK_CHECKING | |
2767 | #define EVAL_STACK_CHECKING | |
2768 | #endif | |
6dbd0af5 MD |
2769 | #endif |
2770 | ||
0f2d19dd | 2771 | |
434f2f7a DH |
2772 | /* scm_last_debug_frame contains a pointer to the last debugging information |
2773 | * stack frame. It is accessed very often from the debugging evaluator, so it | |
2774 | * should probably not be indirectly addressed. Better to save and restore it | |
2775 | * from the current root at any stack swaps. | |
6dbd0af5 MD |
2776 | */ |
2777 | ||
6dbd0af5 MD |
2778 | /* scm_debug_eframe_size is the number of slots available for pseudo |
2779 | * stack frames at each real stack frame. | |
2780 | */ | |
2781 | ||
c014a02e | 2782 | long scm_debug_eframe_size; |
6dbd0af5 | 2783 | |
434f2f7a DH |
2784 | int scm_debug_mode_p; |
2785 | int scm_check_entry_p; | |
2786 | int scm_check_apply_p; | |
2787 | int scm_check_exit_p; | |
6dbd0af5 | 2788 | |
c014a02e | 2789 | long scm_eval_stack; |
a74145b8 | 2790 | |
92c2555f | 2791 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 2792 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
2793 | }; |
2794 | ||
92c2555f | 2795 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
2796 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
2797 | "*Flyweight representation of the stack at traps." }, | |
2798 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
2799 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
2800 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
2801 | "Record procedure names at definition." }, | |
2802 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
2803 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 2804 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
2805 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
2806 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 2807 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
2808 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
2809 | "Maximal number of stored backtrace frames." }, | |
2810 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
2811 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
2812 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 2813 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 2814 | { 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 |
2815 | }; |
2816 | ||
92c2555f | 2817 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 2818 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
2819 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
2820 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
2821 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
2822 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
2823 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
2824 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
2825 | }; |
2826 | ||
a1ec6916 | 2827 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 2828 | (SCM setting), |
b3f26b14 MG |
2829 | "Option interface for the evaluation options. Instead of using\n" |
2830 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 2831 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 2832 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
2833 | { |
2834 | SCM ans; | |
2835 | SCM_DEFER_INTS; | |
2836 | ans = scm_options (setting, | |
2837 | scm_eval_opts, | |
2838 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 2839 | FUNC_NAME); |
a74145b8 | 2840 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
2841 | SCM_ALLOW_INTS; |
2842 | return ans; | |
2843 | } | |
1bbd0b84 | 2844 | #undef FUNC_NAME |
33b97402 | 2845 | |
d0b07b5d | 2846 | |
a1ec6916 | 2847 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 2848 | (SCM setting), |
b3f26b14 | 2849 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 2850 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
2851 | { |
2852 | SCM ans; | |
2853 | SCM_DEFER_INTS; | |
2854 | ans = scm_options (setting, | |
2855 | scm_evaluator_trap_table, | |
2856 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 2857 | FUNC_NAME); |
33b97402 | 2858 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 2859 | SCM_ALLOW_INTS; |
33b97402 MD |
2860 | return ans; |
2861 | } | |
1bbd0b84 | 2862 | #undef FUNC_NAME |
33b97402 | 2863 | |
d0b07b5d | 2864 | |
24933780 | 2865 | static SCM |
a392ee15 | 2866 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 2867 | { |
b1cb24ff | 2868 | SCM *results = lloc; |
904a077d | 2869 | while (SCM_CONSP (l)) |
0f2d19dd | 2870 | { |
b1cb24ff | 2871 | const SCM res = EVALCAR (l, env); |
904a077d | 2872 | |
8ea46249 | 2873 | *lloc = scm_list_1 (res); |
a23afe53 | 2874 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
2875 | l = SCM_CDR (l); |
2876 | } | |
22a52da1 | 2877 | if (!SCM_NULLP (l)) |
904a077d | 2878 | scm_wrong_num_args (proc); |
680ed4a8 | 2879 | return *results; |
0f2d19dd JB |
2880 | } |
2881 | ||
6dbd0af5 MD |
2882 | #endif /* !DEVAL */ |
2883 | ||
2884 | ||
a392ee15 | 2885 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
2886 | */ |
2887 | ||
a392ee15 | 2888 | |
d9d39d76 | 2889 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 2890 | * current module. */ |
d9d39d76 MV |
2891 | #define UPDATE_TOPLEVEL_ENV(env) \ |
2892 | do { \ | |
2893 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 2894 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
2895 | env = scm_top_level_env (p); \ |
2896 | } while (0) | |
2897 | ||
6dbd0af5 | 2898 | |
6f81708a DH |
2899 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
2900 | ASSERT_SYNTAX (!SCM_EQ_P ((x), SCM_EOL), s_empty_combination, x) | |
2901 | ||
2902 | ||
a392ee15 DH |
2903 | /* This is the evaluator. Like any real monster, it has three heads: |
2904 | * | |
434f2f7a DH |
2905 | * ceval is the non-debugging evaluator, deval is the debugging version. Both |
2906 | * are implemented using a common code base, using the following mechanism: | |
2907 | * CEVAL is a macro, which is either defined to ceval or deval. Thus, there | |
2908 | * is no function CEVAL, but the code for CEVAL actually compiles to either | |
2909 | * ceval or deval. When CEVAL is defined to ceval, it is known that the macro | |
2910 | * DEVAL is not defined. When CEVAL is defined to deval, then the macro DEVAL | |
2911 | * is known to be defined. Thus, in CEVAL parts for the debugging evaluator | |
a392ee15 DH |
2912 | * are enclosed within #ifdef DEVAL ... #endif. |
2913 | * | |
434f2f7a DH |
2914 | * All three (ceval, deval and their common implementation CEVAL) take two |
2915 | * input parameters, x and env: x is a single expression to be evalutated. | |
2916 | * env is the environment in which bindings are searched. | |
a392ee15 | 2917 | * |
434f2f7a DH |
2918 | * x is known to be a pair. Since x is a single expression, it is necessarily |
2919 | * in a tail position. If x is just a call to another function like in the | |
2920 | * expression (foo exp1 exp2 ...), the realization of that call therefore | |
2921 | * _must_not_ increase stack usage (the evaluation of exp1, exp2 etc., | |
2922 | * however, may do so). This is realized by making extensive use of 'goto' | |
2923 | * statements within the evaluator: The gotos replace recursive calls to | |
2924 | * CEVAL, thus re-using the same stack frame that CEVAL was already using. | |
2925 | * If, however, x represents some form that requires to evaluate a sequence of | |
2926 | * expressions like (begin exp1 exp2 ...), then recursive calls to CEVAL are | |
2927 | * performed for all but the last expression of that sequence. */ | |
6dbd0af5 | 2928 | |
434f2f7a DH |
2929 | static SCM |
2930 | CEVAL (SCM x, SCM env) | |
0f2d19dd | 2931 | { |
42030fb2 | 2932 | SCM proc, arg1; |
6dbd0af5 | 2933 | #ifdef DEVAL |
92c2555f MV |
2934 | scm_t_debug_frame debug; |
2935 | scm_t_debug_info *debug_info_end; | |
1646d37b | 2936 | debug.prev = scm_last_debug_frame; |
020c890c | 2937 | debug.status = 0; |
04b6c081 | 2938 | /* |
92c2555f | 2939 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
2940 | * user has specified with (debug-set! frames <n>). |
2941 | * | |
2942 | * Even frames are eval frames, odd frames are apply frames. | |
2943 | */ | |
92c2555f | 2944 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 2945 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
2946 | debug.info = debug.vect; |
2947 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
2948 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 2949 | #endif |
b7ff98dd | 2950 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 2951 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 2952 | { |
b7ff98dd | 2953 | #ifdef DEVAL |
6dbd0af5 MD |
2954 | debug.info->e.exp = x; |
2955 | debug.info->e.env = env; | |
b7ff98dd | 2956 | #endif |
6dbd0af5 MD |
2957 | scm_report_stack_overflow (); |
2958 | } | |
2959 | #endif | |
6a0f6ff3 | 2960 | |
6dbd0af5 MD |
2961 | #ifdef DEVAL |
2962 | goto start; | |
2963 | #endif | |
6a0f6ff3 | 2964 | |
6dbd0af5 MD |
2965 | loop: |
2966 | #ifdef DEVAL | |
b7ff98dd MD |
2967 | SCM_CLEAR_ARGSREADY (debug); |
2968 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 2969 | --debug.info; |
04b6c081 MD |
2970 | /* |
2971 | * In theory, this should be the only place where it is necessary to | |
2972 | * check for space in debug.vect since both eval frames and | |
2973 | * available space are even. | |
2974 | * | |
2975 | * For this to be the case, however, it is necessary that primitive | |
2976 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 2977 | * label call PREP_APPLY. |
04b6c081 | 2978 | */ |
c0ab1b8d | 2979 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 2980 | { |
b7ff98dd | 2981 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
2982 | debug.info -= 2; |
2983 | } | |
6a0f6ff3 | 2984 | |
6dbd0af5 MD |
2985 | start: |
2986 | debug.info->e.exp = x; | |
2987 | debug.info->e.env = env; | |
5132eef0 DH |
2988 | if (scm_check_entry_p && SCM_TRAPS_P) |
2989 | { | |
bc76d628 DH |
2990 | if (SCM_ENTER_FRAME_P |
2991 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 2992 | { |
bc76d628 DH |
2993 | SCM stackrep; |
2994 | SCM tail = SCM_BOOL (SCM_TAILRECP (debug)); | |
5132eef0 DH |
2995 | SCM_SET_TAILREC (debug); |
2996 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 2997 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
2998 | else |
2999 | { | |
3000 | int first; | |
3001 | SCM val = scm_make_continuation (&first); | |
3002 | ||
3003 | if (first) | |
bc76d628 | 3004 | stackrep = val; |
5132eef0 DH |
3005 | else |
3006 | { | |
3007 | x = val; | |
3008 | if (SCM_IMP (x)) | |
3009 | RETURN (x); | |
3010 | else | |
3011 | /* This gives the possibility for the debugger to | |
3012 | modify the source expression before evaluation. */ | |
3013 | goto dispatch; | |
3014 | } | |
3015 | } | |
3016 | SCM_TRAPS_P = 0; | |
3017 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
3018 | scm_sym_enter_frame, | |
bc76d628 | 3019 | stackrep, |
5132eef0 DH |
3020 | tail, |
3021 | scm_unmemocopy (x, env)); | |
3022 | SCM_TRAPS_P = 1; | |
3023 | } | |
3024 | } | |
6dbd0af5 | 3025 | #endif |
f8769b1d | 3026 | dispatch: |
9cb5124f | 3027 | SCM_TICK; |
dec40cd2 | 3028 | if (SCM_ISYMP (SCM_CAR (x))) |
0f2d19dd | 3029 | { |
7e6e6b37 | 3030 | switch (ISYMNUM (SCM_CAR (x))) |
dec40cd2 | 3031 | { |
7e6e6b37 | 3032 | case (ISYMNUM (SCM_IM_AND)): |
dec40cd2 DH |
3033 | x = SCM_CDR (x); |
3034 | while (!SCM_NULLP (SCM_CDR (x))) | |
3035 | { | |
3036 | SCM test_result = EVALCAR (x, env); | |
3037 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
3038 | RETURN (SCM_BOOL_F); | |
3039 | else | |
3040 | x = SCM_CDR (x); | |
3041 | } | |
3042 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3043 | goto carloop; | |
0f2d19dd | 3044 | |
7e6e6b37 | 3045 | case (ISYMNUM (SCM_IM_BEGIN)): |
dec40cd2 DH |
3046 | x = SCM_CDR (x); |
3047 | if (SCM_NULLP (x)) | |
3048 | RETURN (SCM_UNSPECIFIED); | |
b8113bc8 | 3049 | |
dec40cd2 | 3050 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd | 3051 | |
dec40cd2 DH |
3052 | begin: |
3053 | /* If we are on toplevel with a lookup closure, we need to sync | |
3054 | with the current module. */ | |
3055 | if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env))) | |
3056 | { | |
3057 | UPDATE_TOPLEVEL_ENV (env); | |
3058 | while (!SCM_NULLP (SCM_CDR (x))) | |
3059 | { | |
3060 | EVALCAR (x, env); | |
3061 | UPDATE_TOPLEVEL_ENV (env); | |
3062 | x = SCM_CDR (x); | |
3063 | } | |
3064 | goto carloop; | |
3065 | } | |
3066 | else | |
3067 | goto nontoplevel_begin; | |
5280aaca | 3068 | |
dec40cd2 DH |
3069 | nontoplevel_begin: |
3070 | while (!SCM_NULLP (SCM_CDR (x))) | |
3071 | { | |
b1cb24ff | 3072 | const SCM form = SCM_CAR (x); |
dec40cd2 DH |
3073 | if (SCM_IMP (form)) |
3074 | { | |
3075 | if (SCM_ISYMP (form)) | |
3076 | { | |
3077 | scm_rec_mutex_lock (&source_mutex); | |
3078 | /* check for race condition */ | |
3079 | if (SCM_ISYMP (SCM_CAR (x))) | |
3080 | m_expand_body (x, env); | |
3081 | scm_rec_mutex_unlock (&source_mutex); | |
3082 | goto nontoplevel_begin; | |
3083 | } | |
3084 | else | |
3085 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); | |
3086 | } | |
3087 | else | |
b1cb24ff | 3088 | (void) EVAL (form, env); |
dec40cd2 DH |
3089 | x = SCM_CDR (x); |
3090 | } | |
b1cb24ff | 3091 | |
dec40cd2 DH |
3092 | carloop: |
3093 | { | |
3094 | /* scm_eval last form in list */ | |
b1cb24ff | 3095 | const SCM last_form = SCM_CAR (x); |
0f2d19dd | 3096 | |
dec40cd2 DH |
3097 | if (SCM_CONSP (last_form)) |
3098 | { | |
3099 | /* This is by far the most frequent case. */ | |
3100 | x = last_form; | |
3101 | goto loop; /* tail recurse */ | |
3102 | } | |
3103 | else if (SCM_IMP (last_form)) | |
3104 | RETURN (SCM_EVALIM (last_form, env)); | |
3105 | else if (SCM_VARIABLEP (last_form)) | |
3106 | RETURN (SCM_VARIABLE_REF (last_form)); | |
3107 | else if (SCM_SYMBOLP (last_form)) | |
3108 | RETURN (*scm_lookupcar (x, env, 1)); | |
3109 | else | |
3110 | RETURN (last_form); | |
3111 | } | |
0f2d19dd JB |
3112 | |
3113 | ||
7e6e6b37 | 3114 | case (ISYMNUM (SCM_IM_CASE)): |
dec40cd2 DH |
3115 | x = SCM_CDR (x); |
3116 | { | |
b1cb24ff | 3117 | const SCM key = EVALCAR (x, env); |
dec40cd2 DH |
3118 | x = SCM_CDR (x); |
3119 | while (!SCM_NULLP (x)) | |
3120 | { | |
b1cb24ff | 3121 | const SCM clause = SCM_CAR (x); |
dec40cd2 DH |
3122 | SCM labels = SCM_CAR (clause); |
3123 | if (SCM_EQ_P (labels, SCM_IM_ELSE)) | |
3124 | { | |
3125 | x = SCM_CDR (clause); | |
3126 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3127 | goto begin; | |
3128 | } | |
3129 | while (!SCM_NULLP (labels)) | |
3130 | { | |
b1cb24ff | 3131 | const SCM label = SCM_CAR (labels); |
dec40cd2 DH |
3132 | if (SCM_EQ_P (label, key) |
3133 | || !SCM_FALSEP (scm_eqv_p (label, key))) | |
3134 | { | |
3135 | x = SCM_CDR (clause); | |
3136 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3137 | goto begin; | |
3138 | } | |
3139 | labels = SCM_CDR (labels); | |
3140 | } | |
3141 | x = SCM_CDR (x); | |
3142 | } | |
3143 | } | |
3144 | RETURN (SCM_UNSPECIFIED); | |
0f2d19dd JB |
3145 | |
3146 | ||
7e6e6b37 | 3147 | case (ISYMNUM (SCM_IM_COND)): |
dec40cd2 DH |
3148 | x = SCM_CDR (x); |
3149 | while (!SCM_NULLP (x)) | |
3150 | { | |
b1cb24ff | 3151 | const SCM clause = SCM_CAR (x); |
dec40cd2 DH |
3152 | if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE)) |
3153 | { | |
3154 | x = SCM_CDR (clause); | |
3155 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3156 | goto begin; | |
3157 | } | |
3158 | else | |
3159 | { | |
3160 | arg1 = EVALCAR (clause, env); | |
3161 | if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1)) | |
3162 | { | |
3163 | x = SCM_CDR (clause); | |
3164 | if (SCM_NULLP (x)) | |
3165 | RETURN (arg1); | |
3166 | else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW)) | |
3167 | { | |
3168 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3169 | goto begin; | |
3170 | } | |
3171 | else | |
3172 | { | |
3173 | proc = SCM_CDR (x); | |
3174 | proc = EVALCAR (proc, env); | |
3175 | PREP_APPLY (proc, scm_list_1 (arg1)); | |
3176 | ENTER_APPLY; | |
3177 | goto evap1; | |
3178 | } | |
3179 | } | |
3180 | x = SCM_CDR (x); | |
3181 | } | |
3182 | } | |
3183 | RETURN (SCM_UNSPECIFIED); | |
e5cb71a0 | 3184 | |
e5cb71a0 | 3185 | |
7e6e6b37 | 3186 | case (ISYMNUM (SCM_IM_DO)): |
dec40cd2 DH |
3187 | x = SCM_CDR (x); |
3188 | { | |
3189 | /* Compute the initialization values and the initial environment. */ | |
3190 | SCM init_forms = SCM_CAR (x); | |
3191 | SCM init_values = SCM_EOL; | |
3192 | while (!SCM_NULLP (init_forms)) | |
3193 | { | |
3194 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3195 | init_forms = SCM_CDR (init_forms); | |
3196 | } | |
3197 | x = SCM_CDR (x); | |
3198 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3199 | } | |
3200 | x = SCM_CDR (x); | |
3201 | { | |
3202 | SCM test_form = SCM_CAR (x); | |
3203 | SCM body_forms = SCM_CADR (x); | |
3204 | SCM step_forms = SCM_CDDR (x); | |
e5cb71a0 | 3205 | |
dec40cd2 | 3206 | SCM test_result = EVALCAR (test_form, env); |
e5cb71a0 | 3207 | |
dec40cd2 DH |
3208 | while (SCM_FALSEP (test_result) || SCM_NILP (test_result)) |
3209 | { | |
3210 | { | |
3211 | /* Evaluate body forms. */ | |
3212 | SCM temp_forms; | |
3213 | for (temp_forms = body_forms; | |
3214 | !SCM_NULLP (temp_forms); | |
3215 | temp_forms = SCM_CDR (temp_forms)) | |
3216 | { | |
3217 | SCM form = SCM_CAR (temp_forms); | |
b1cb24ff DH |
3218 | /* Dirk:FIXME: We only need to eval forms that may have |
3219 | * a side effect here. This is only true for forms that | |
3220 | * start with a pair. All others are just constants. | |
3221 | * Since with the current memoizer 'form' may hold a | |
3222 | * constant, we call EVAL here to handle the constant | |
3223 | * cases. In the long run it would make sense to have | |
3224 | * the macro transformer of 'do' eliminate all forms | |
3225 | * that have no sideeffect. Then instead of EVAL we | |
3226 | * could call CEVAL directly here. */ | |
3227 | (void) EVAL (form, env); | |
dec40cd2 DH |
3228 | } |
3229 | } | |
0f2d19dd | 3230 | |
dec40cd2 DH |
3231 | { |
3232 | /* Evaluate the step expressions. */ | |
3233 | SCM temp_forms; | |
3234 | SCM step_values = SCM_EOL; | |
3235 | for (temp_forms = step_forms; | |
3236 | !SCM_NULLP (temp_forms); | |
3237 | temp_forms = SCM_CDR (temp_forms)) | |
3238 | { | |
b1cb24ff | 3239 | const SCM value = EVALCAR (temp_forms, env); |
dec40cd2 DH |
3240 | step_values = scm_cons (value, step_values); |
3241 | } | |
3242 | env = SCM_EXTEND_ENV (SCM_CAAR (env), | |
3243 | step_values, | |
3244 | SCM_CDR (env)); | |
3245 | } | |
0f2d19dd | 3246 | |
dec40cd2 DH |
3247 | test_result = EVALCAR (test_form, env); |
3248 | } | |
3249 | } | |
3250 | x = SCM_CDAR (x); | |
3251 | if (SCM_NULLP (x)) | |
3252 | RETURN (SCM_UNSPECIFIED); | |
3253 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3254 | goto nontoplevel_begin; | |
0f2d19dd JB |
3255 | |
3256 | ||
7e6e6b37 | 3257 | case (ISYMNUM (SCM_IM_IF)): |
dec40cd2 DH |
3258 | x = SCM_CDR (x); |
3259 | { | |
3260 | SCM test_result = EVALCAR (x, env); | |
3261 | x = SCM_CDR (x); /* then expression */ | |
3262 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
3263 | { | |
3264 | x = SCM_CDR (x); /* else expression */ | |
3265 | if (SCM_NULLP (x)) | |
3266 | RETURN (SCM_UNSPECIFIED); | |
3267 | } | |
3268 | } | |
3269 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3270 | goto carloop; | |
0f2d19dd JB |
3271 | |
3272 | ||
7e6e6b37 | 3273 | case (ISYMNUM (SCM_IM_LET)): |
dec40cd2 DH |
3274 | x = SCM_CDR (x); |
3275 | { | |
3276 | SCM init_forms = SCM_CADR (x); | |
3277 | SCM init_values = SCM_EOL; | |
3278 | do | |
3279 | { | |
3280 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3281 | init_forms = SCM_CDR (init_forms); | |
3282 | } | |
3283 | while (!SCM_NULLP (init_forms)); | |
3284 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); | |
3285 | } | |
3286 | x = SCM_CDDR (x); | |
3287 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3288 | goto nontoplevel_begin; | |
0f2d19dd JB |
3289 | |
3290 | ||
7e6e6b37 | 3291 | case (ISYMNUM (SCM_IM_LETREC)): |
dec40cd2 DH |
3292 | x = SCM_CDR (x); |
3293 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); | |
3294 | x = SCM_CDR (x); | |
3295 | { | |
3296 | SCM init_forms = SCM_CAR (x); | |
3297 | SCM init_values = SCM_EOL; | |
3298 | do | |
3299 | { | |
3300 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3301 | init_forms = SCM_CDR (init_forms); | |
3302 | } | |
3303 | while (!SCM_NULLP (init_forms)); | |
3304 | SCM_SETCDR (SCM_CAR (env), init_values); | |
3305 | } | |
3306 | x = SCM_CDR (x); | |
3307 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3308 | goto nontoplevel_begin; | |
0f2d19dd | 3309 | |
302c12b4 | 3310 | |
7e6e6b37 | 3311 | case (ISYMNUM (SCM_IM_LETSTAR)): |
dec40cd2 DH |
3312 | x = SCM_CDR (x); |
3313 | { | |
3314 | SCM bindings = SCM_CAR (x); | |
3315 | if (SCM_NULLP (bindings)) | |
3316 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); | |
3317 | else | |
3318 | { | |
3319 | do | |
3320 | { | |
3321 | SCM name = SCM_CAR (bindings); | |
3322 | SCM init = SCM_CDR (bindings); | |
3323 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); | |
3324 | bindings = SCM_CDR (init); | |
3325 | } | |
3326 | while (!SCM_NULLP (bindings)); | |
3327 | } | |
3328 | } | |
3329 | x = SCM_CDR (x); | |
3330 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3331 | goto nontoplevel_begin; | |
0f2d19dd JB |
3332 | |
3333 | ||
7e6e6b37 | 3334 | case (ISYMNUM (SCM_IM_OR)): |
dec40cd2 DH |
3335 | x = SCM_CDR (x); |
3336 | while (!SCM_NULLP (SCM_CDR (x))) | |
3337 | { | |
3338 | SCM val = EVALCAR (x, env); | |
3339 | if (!SCM_FALSEP (val) && !SCM_NILP (val)) | |
3340 | RETURN (val); | |
3341 | else | |
3342 | x = SCM_CDR (x); | |
3343 | } | |
3344 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3345 | goto carloop; | |
0f2d19dd JB |
3346 | |
3347 | ||
7e6e6b37 | 3348 | case (ISYMNUM (SCM_IM_LAMBDA)): |
dec40cd2 | 3349 | RETURN (scm_closure (SCM_CDR (x), env)); |
0f2d19dd JB |
3350 | |
3351 | ||
7e6e6b37 | 3352 | case (ISYMNUM (SCM_IM_QUOTE)): |
e7313a9d | 3353 | RETURN (SCM_CDR (x)); |
0f2d19dd JB |
3354 | |
3355 | ||
7e6e6b37 | 3356 | case (ISYMNUM (SCM_IM_SET_X)): |
dec40cd2 DH |
3357 | x = SCM_CDR (x); |
3358 | { | |
3359 | SCM *location; | |
3360 | SCM variable = SCM_CAR (x); | |
3361 | if (SCM_ILOCP (variable)) | |
3362 | location = scm_ilookup (variable, env); | |
3363 | else if (SCM_VARIABLEP (variable)) | |
3364 | location = SCM_VARIABLE_LOC (variable); | |
36245b66 DH |
3365 | else |
3366 | { | |
3367 | /* (SCM_SYMBOLP (variable)) is known to be true */ | |
3368 | variable = lazy_memoize_variable (variable, env); | |
3369 | SCM_SETCAR (x, variable); | |
3370 | location = SCM_VARIABLE_LOC (variable); | |
3371 | } | |
dec40cd2 DH |
3372 | x = SCM_CDR (x); |
3373 | *location = EVALCAR (x, env); | |
3374 | } | |
3375 | RETURN (SCM_UNSPECIFIED); | |
3f04400d DH |
3376 | |
3377 | ||
7e6e6b37 | 3378 | case (ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3379 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3380 | x = SCM_CDR (x); |
3381 | proc = EVALCAR (x, env); | |
3382 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3383 | |
3384 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3385 | x = SCM_CDR (x); |
3386 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3387 | |
3388 | apply_proc: | |
3389 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3390 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3391 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3392 | if (SCM_CLOSUREP (proc)) |
3393 | { | |
9a069bdd | 3394 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3395 | #ifdef DEVAL |
9a069bdd | 3396 | debug.info->a.args = arg1; |
6dbd0af5 | 3397 | #endif |
9a069bdd DH |
3398 | if (scm_badargsp (formals, arg1)) |
3399 | scm_wrong_num_args (proc); | |
3400 | ENTER_APPLY; | |
3401 | /* Copy argument list */ | |
3402 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3403 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3404 | else | |
3405 | { | |
3406 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3407 | SCM tail = args; | |
3408 | arg1 = SCM_CDR (arg1); | |
3409 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3410 | { | |
3411 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3412 | SCM_SETCDR (tail, new_tail); | |
3413 | tail = new_tail; | |
3414 | arg1 = SCM_CDR (arg1); | |
3415 | } | |
3416 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3417 | } | |
3418 | ||
3419 | x = SCM_CLOSURE_BODY (proc); | |
3420 | goto nontoplevel_begin; | |
0f2d19dd | 3421 | } |
3f04400d DH |
3422 | else |
3423 | { | |
e910e9d2 DH |
3424 | ENTER_APPLY; |
3425 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3426 | } |
3427 | ||
0f2d19dd | 3428 | |
7e6e6b37 | 3429 | case (ISYMNUM (SCM_IM_CONT)): |
5f144b10 GH |
3430 | { |
3431 | int first; | |
3432 | SCM val = scm_make_continuation (&first); | |
3433 | ||
e050d4f8 | 3434 | if (!first) |
5f144b10 | 3435 | RETURN (val); |
e050d4f8 DH |
3436 | else |
3437 | { | |
3438 | arg1 = val; | |
3439 | proc = SCM_CDR (x); | |
6bff1368 | 3440 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3441 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3442 | ENTER_APPLY; | |
e050d4f8 DH |
3443 | goto evap1; |
3444 | } | |
5f144b10 | 3445 | } |
e050d4f8 | 3446 | |
0f2d19dd | 3447 | |
7e6e6b37 | 3448 | case (ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3449 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3450 | |
e050d4f8 | 3451 | |
7e6e6b37 | 3452 | case (ISYMNUM (SCM_IM_FUTURE)): |
28d52ebb MD |
3453 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); |
3454 | ||
3455 | ||
7e6e6b37 DH |
3456 | /* PLACEHOLDER for case (ISYMNUM (SCM_IM_DISPATCH)): The following |
3457 | code (type_dispatch) is intended to be the tail of the case | |
3458 | clause for the internal macro SCM_IM_DISPATCH. Please don't | |
3459 | remove it from this location without discussing it with Mikael | |
c8e1d354 MD |
3460 | <djurfeldt@nada.kth.se> */ |
3461 | ||
f12745b6 DH |
3462 | /* The type dispatch code is duplicated below |
3463 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3464 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3465 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3466 | /* Type dispatch means to determine from the types of the function |
3467 | * arguments (i. e. the 'signature' of the call), which method from | |
3468 | * a generic function is to be called. This process of selecting | |
3469 | * the right method takes some time. To speed it up, guile uses | |
3470 | * caching: Together with the macro call to dispatch the signatures | |
3471 | * of some previous calls to that generic function from the same | |
3472 | * place are stored (in the code!) in a cache that we call the | |
3473 | * 'method cache'. This is done since it is likely, that | |
3474 | * consecutive calls to dispatch from that position in the code will | |
3475 | * have the same signature. Thus, the type dispatch works as | |
3476 | * follows: First, determine a hash value from the signature of the | |
3477 | * actual arguments. Second, use this hash value as an index to | |
3478 | * find that same signature in the method cache stored at this | |
3479 | * position in the code. If found, you have also found the | |
3480 | * corresponding method that belongs to that signature. If the | |
3481 | * signature is not found in the method cache, you have to perform a | |
3482 | * full search over all signatures stored with the generic | |
3483 | * function. */ | |
3484 | { | |
3485 | unsigned long int specializers; | |
3486 | unsigned long int hash_value; | |
3487 | unsigned long int cache_end_pos; | |
3488 | unsigned long int mask; | |
3489 | SCM method_cache; | |
3490 | ||
3491 | { | |
3492 | SCM z = SCM_CDDR (x); | |
3493 | SCM tmp = SCM_CADR (z); | |
3494 | specializers = SCM_INUM (SCM_CAR (z)); | |
3495 | ||
3496 | /* Compute a hash value for searching the method cache. There | |
3497 | * are two variants for computing the hash value, a (rather) | |
3498 | * complicated one, and a simple one. For the complicated one | |
3499 | * explained below, tmp holds a number that is used in the | |
3500 | * computation. */ | |
3501 | if (SCM_INUMP (tmp)) | |
3502 | { | |
3503 | /* Use the signature of the actual arguments to determine | |
3504 | * the hash value. This is done as follows: Each class has | |
3505 | * an array of random numbers, that are determined when the | |
3506 | * class is created. The integer 'hashset' is an index into | |
3507 | * that array of random numbers. Now, from all classes that | |
3508 | * are part of the signature of the actual arguments, the | |
3509 | * random numbers at index 'hashset' are taken and summed | |
3510 | * up, giving the hash value. The value of 'hashset' is | |
3511 | * stored at the call to dispatch. This allows to have | |
3512 | * different 'formulas' for calculating the hash value at | |
3513 | * different places where dispatch is called. This allows | |
3514 | * to optimize the hash formula at every individual place | |
3515 | * where dispatch is called, such that hopefully the hash | |
3516 | * value that is computed will directly point to the right | |
3517 | * method in the method cache. */ | |
3518 | unsigned long int hashset = SCM_INUM (tmp); | |
3519 | unsigned long int counter = specializers + 1; | |
dff98306 | 3520 | SCM tmp_arg = arg1; |
f12745b6 DH |
3521 | hash_value = 0; |
3522 | while (!SCM_NULLP (tmp_arg) && counter != 0) | |
61364ba6 | 3523 | { |
f12745b6 DH |
3524 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3525 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3526 | tmp_arg = SCM_CDR (tmp_arg); | |
3527 | counter--; | |
61364ba6 | 3528 | } |
f12745b6 DH |
3529 | z = SCM_CDDR (z); |
3530 | method_cache = SCM_CADR (z); | |
3531 | mask = SCM_INUM (SCM_CAR (z)); | |
3532 | hash_value &= mask; | |
3533 | cache_end_pos = hash_value; | |
3534 | } | |
3535 | else | |
3536 | { | |
3537 | /* This method of determining the hash value is much | |
3538 | * simpler: Set the hash value to zero and just perform a | |
3539 | * linear search through the method cache. */ | |
3540 | method_cache = tmp; | |
3541 | mask = (unsigned long int) ((long) -1); | |
3542 | hash_value = 0; | |
3543 | cache_end_pos = SCM_VECTOR_LENGTH (method_cache); | |
3544 | } | |
3545 | } | |
61364ba6 | 3546 | |
f12745b6 DH |
3547 | { |
3548 | /* Search the method cache for a method with a matching | |
3549 | * signature. Start the search at position 'hash_value'. The | |
3550 | * hashing implementation uses linear probing for conflict | |
3551 | * resolution, that is, if the signature in question is not | |
3552 | * found at the starting index in the hash table, the next table | |
3553 | * entry is tried, and so on, until in the worst case the whole | |
3554 | * cache has been searched, but still the signature has not been | |
3555 | * found. */ | |
3556 | SCM z; | |
3557 | do | |
3558 | { | |
dff98306 | 3559 | SCM args = arg1; /* list of arguments */ |
f12745b6 DH |
3560 | z = SCM_VELTS (method_cache)[hash_value]; |
3561 | while (!SCM_NULLP (args)) | |
61364ba6 MD |
3562 | { |
3563 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 DH |
3564 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
3565 | if (!SCM_EQ_P (class_of_arg, SCM_CAR (z))) | |
61364ba6 | 3566 | goto next_method; |
f12745b6 | 3567 | args = SCM_CDR (args); |
61364ba6 MD |
3568 | z = SCM_CDR (z); |
3569 | } | |
f12745b6 DH |
3570 | /* Fewer arguments than specifiers => CAR != ENV */ |
3571 | if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))) | |
3572 | goto apply_cmethod; | |
3573 | next_method: | |
3574 | hash_value = (hash_value + 1) & mask; | |
3575 | } while (hash_value != cache_end_pos); | |
3576 | ||
3577 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3578 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3579 | |
dff98306 | 3580 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3581 | { |
3582 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3583 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3584 | x = SCM_CMETHOD_BODY (z); |
3585 | goto nontoplevel_begin; | |
3586 | } | |
3587 | } | |
61364ba6 | 3588 | } |
73b64342 | 3589 | |
1d15ecd3 | 3590 | |
7e6e6b37 | 3591 | case (ISYMNUM (SCM_IM_SLOT_REF)): |
ca4be6ea | 3592 | x = SCM_CDR (x); |
1d15ecd3 DH |
3593 | { |
3594 | SCM instance = EVALCAR (x, env); | |
e7313a9d | 3595 | unsigned long int slot = SCM_INUM (SCM_CDR (x)); |
1d15ecd3 DH |
3596 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); |
3597 | } | |
3598 | ||
3599 | ||
7e6e6b37 | 3600 | case (ISYMNUM (SCM_IM_SLOT_SET_X)): |
ca4be6ea | 3601 | x = SCM_CDR (x); |
1d15ecd3 DH |
3602 | { |
3603 | SCM instance = EVALCAR (x, env); | |
3604 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3605 | SCM value = EVALCAR (SCM_CDDR (x), env); | |
3606 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3607 | RETURN (SCM_UNSPECIFIED); | |
3608 | } | |
3609 | ||
c96d76b8 | 3610 | |
22721140 | 3611 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3612 | |
7e6e6b37 | 3613 | case (ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3614 | { |
3615 | SCM test_form = SCM_CDR (x); | |
3616 | x = SCM_CDR (test_form); | |
3617 | while (!SCM_NULL_OR_NIL_P (x)) | |
3618 | { | |
3619 | SCM test_result = EVALCAR (test_form, env); | |
3620 | if (!(SCM_FALSEP (test_result) | |
3621 | || SCM_NULL_OR_NIL_P (test_result))) | |
3622 | { | |
3623 | if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED)) | |
3624 | RETURN (test_result); | |
3625 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3626 | goto carloop; | |
3627 | } | |
3628 | else | |
3629 | { | |
3630 | test_form = SCM_CDR (x); | |
3631 | x = SCM_CDR (test_form); | |
3632 | } | |
3633 | } | |
3634 | x = test_form; | |
3635 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3636 | goto carloop; | |
3637 | } | |
73b64342 | 3638 | |
c96d76b8 | 3639 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 | 3640 | |
7e6e6b37 | 3641 | case (ISYMNUM (SCM_IM_BIND)): |
2e171178 MV |
3642 | { |
3643 | SCM vars, exps, vals; | |
73b64342 | 3644 | |
2e171178 MV |
3645 | x = SCM_CDR (x); |
3646 | vars = SCM_CAAR (x); | |
3647 | exps = SCM_CDAR (x); | |
2e171178 | 3648 | vals = SCM_EOL; |
82b3e2c6 | 3649 | while (!SCM_NULLP (exps)) |
2e171178 MV |
3650 | { |
3651 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3652 | exps = SCM_CDR (exps); | |
3653 | } | |
3654 | ||
3655 | scm_swap_bindings (vars, vals); | |
3656 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3657 | |
3658 | /* Ignore all but the last evaluation result. */ | |
3659 | for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x)) | |
2e171178 | 3660 | { |
1d15ecd3 | 3661 | if (SCM_CONSP (SCM_CAR (x))) |
434f2f7a | 3662 | CEVAL (SCM_CAR (x), env); |
2e171178 MV |
3663 | } |
3664 | proc = EVALCAR (x, env); | |
73b64342 | 3665 | |
2e171178 MV |
3666 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3667 | scm_swap_bindings (vars, vals); | |
73b64342 | 3668 | |
ddea3325 | 3669 | RETURN (proc); |
2e171178 | 3670 | } |
c96d76b8 | 3671 | |
1d15ecd3 | 3672 | |
7e6e6b37 | 3673 | case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
a513ead3 | 3674 | { |
9a069bdd DH |
3675 | SCM producer; |
3676 | ||
3677 | x = SCM_CDR (x); | |
3678 | producer = EVALCAR (x, env); | |
3679 | x = SCM_CDR (x); | |
3680 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3681 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3682 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3683 | { |
3684 | /* The list of arguments is not copied. Rather, it is assumed | |
3685 | * that this has been done by the 'values' procedure. */ | |
3686 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3687 | } | |
a513ead3 | 3688 | else |
82b3e2c6 DH |
3689 | { |
3690 | arg1 = scm_list_1 (arg1); | |
3691 | } | |
9a069bdd DH |
3692 | PREP_APPLY (proc, arg1); |
3693 | goto apply_proc; | |
a513ead3 MV |
3694 | } |
3695 | ||
b7798e10 | 3696 | |
0f2d19dd | 3697 | default: |
dec40cd2 | 3698 | break; |
0f2d19dd | 3699 | } |
dec40cd2 DH |
3700 | } |
3701 | else | |
3702 | { | |
434f2f7a DH |
3703 | if (SCM_VARIABLEP (SCM_CAR (x))) |
3704 | proc = SCM_VARIABLE_REF (SCM_CAR (x)); | |
f9986767 DH |
3705 | else if (SCM_ILOCP (SCM_CAR (x))) |
3706 | proc = *scm_ilookup (SCM_CAR (x), env); | |
434f2f7a DH |
3707 | else if (SCM_CONSP (SCM_CAR (x))) |
3708 | proc = CEVAL (SCM_CAR (x), env); | |
3709 | else if (SCM_SYMBOLP (SCM_CAR (x))) | |
0f2d19dd | 3710 | { |
e050d4f8 | 3711 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3712 | { |
3713 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3714 | if (location == NULL) | |
3715 | { | |
3716 | /* we have lost the race, start again. */ | |
3717 | goto dispatch; | |
3718 | } | |
3719 | proc = *location; | |
3720 | } | |
f8769b1d | 3721 | |
22a52da1 | 3722 | if (SCM_MACROP (proc)) |
0f2d19dd | 3723 | { |
86d31dfe MV |
3724 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3725 | lookupcar */ | |
e050d4f8 | 3726 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3727 | #ifdef DEVAL |
7c354052 MD |
3728 | /* Set a flag during macro expansion so that macro |
3729 | application frames can be deleted from the backtrace. */ | |
3730 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3731 | #endif |
dff98306 | 3732 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 3733 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
3734 | #ifdef DEVAL |
3735 | SCM_CLEAR_MACROEXP (debug); | |
3736 | #endif | |
22a52da1 | 3737 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3738 | { |
3b88ed2a | 3739 | case 3: |
0f2d19dd | 3740 | case 2: |
e7313a9d | 3741 | if (!SCM_CONSP (arg1)) |
dff98306 | 3742 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); |
e7313a9d DH |
3743 | |
3744 | assert (!SCM_EQ_P (x, SCM_CAR (arg1)) | |
3745 | && !SCM_EQ_P (x, SCM_CDR (arg1))); | |
3746 | ||
6dbd0af5 | 3747 | #ifdef DEVAL |
22a52da1 | 3748 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3749 | { |
6dbd0af5 | 3750 | SCM_DEFER_INTS; |
dff98306 DH |
3751 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3752 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
3753 | SCM_ALLOW_INTS; |
3754 | goto dispatch; | |
3755 | } | |
3756 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
3757 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
3758 | SCM_CAR (x), | |
3759 | SCM_CDR (x)); | |
6dbd0af5 | 3760 | #endif |
0f2d19dd | 3761 | SCM_DEFER_INTS; |
dff98306 DH |
3762 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3763 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 3764 | SCM_ALLOW_INTS; |
680516ba DH |
3765 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3766 | goto loop; | |
3063e30a | 3767 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 3768 | case 1: |
680516ba DH |
3769 | x = arg1; |
3770 | if (SCM_NIMP (x)) | |
3771 | { | |
3772 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3773 | goto loop; | |
3774 | } | |
3775 | else | |
3776 | RETURN (arg1); | |
3063e30a | 3777 | #endif |
0f2d19dd | 3778 | case 0: |
dff98306 | 3779 | RETURN (arg1); |
0f2d19dd JB |
3780 | } |
3781 | } | |
3782 | } | |
3783 | else | |
434f2f7a | 3784 | proc = SCM_CAR (x); |
bd987b8e | 3785 | |
ddd8f927 | 3786 | if (SCM_MACROP (proc)) |
0f2d19dd | 3787 | goto handle_a_macro; |
0f2d19dd JB |
3788 | } |
3789 | ||
3790 | ||
dec40cd2 DH |
3791 | /* When reaching this part of the code, the following is granted: Variable x |
3792 | * holds the first pair of an expression of the form (<function> arg ...). | |
3793 | * Variable proc holds the object that resulted from the evaluation of | |
3794 | * <function>. In the following, the arguments (if any) will be evaluated, | |
3795 | * and proc will be applied to them. If proc does not really hold a | |
3796 | * function object, this will be signalled as an error on the scheme | |
3797 | * level. If the number of arguments does not match the number of arguments | |
3798 | * that are allowed to be passed to proc, also an error on the scheme level | |
3799 | * will be signalled. */ | |
6dbd0af5 MD |
3800 | PREP_APPLY (proc, SCM_EOL); |
3801 | if (SCM_NULLP (SCM_CDR (x))) { | |
3802 | ENTER_APPLY; | |
89efbff4 | 3803 | evap0: |
ddd8f927 | 3804 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
3805 | switch (SCM_TYP7 (proc)) |
3806 | { /* no arguments given */ | |
3807 | case scm_tc7_subr_0: | |
3808 | RETURN (SCM_SUBRF (proc) ()); | |
3809 | case scm_tc7_subr_1o: | |
3810 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
3811 | case scm_tc7_lsubr: | |
3812 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
3813 | case scm_tc7_rpsubr: | |
3814 | RETURN (SCM_BOOL_T); | |
3815 | case scm_tc7_asubr: | |
3816 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 3817 | case scm_tc7_smob: |
68b06924 | 3818 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 3819 | goto badfun; |
68b06924 | 3820 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 3821 | case scm_tc7_cclo: |
dff98306 | 3822 | arg1 = proc; |
0f2d19dd | 3823 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
3824 | #ifdef DEVAL |
3825 | debug.info->a.proc = proc; | |
dff98306 | 3826 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3827 | #endif |
0f2d19dd | 3828 | goto evap1; |
89efbff4 MD |
3829 | case scm_tc7_pws: |
3830 | proc = SCM_PROCEDURE (proc); | |
3831 | #ifdef DEVAL | |
3832 | debug.info->a.proc = proc; | |
3833 | #endif | |
002f1a5d MD |
3834 | if (!SCM_CLOSUREP (proc)) |
3835 | goto evap0; | |
ddd8f927 | 3836 | /* fallthrough */ |
0f2d19dd | 3837 | case scm_tcs_closures: |
ddd8f927 DH |
3838 | { |
3839 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3840 | if (SCM_CONSP (formals)) | |
3841 | goto umwrongnumargs; | |
3842 | x = SCM_CLOSURE_BODY (proc); | |
3843 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3844 | goto nontoplevel_begin; | |
3845 | } | |
904a077d | 3846 | case scm_tcs_struct: |
195847fa MD |
3847 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
3848 | { | |
3849 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 3850 | arg1 = SCM_EOL; |
195847fa MD |
3851 | goto type_dispatch; |
3852 | } | |
2ca0d207 | 3853 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 3854 | { |
dff98306 | 3855 | arg1 = proc; |
195847fa MD |
3856 | proc = (SCM_I_ENTITYP (proc) |
3857 | ? SCM_ENTITY_PROCEDURE (proc) | |
3858 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 3859 | #ifdef DEVAL |
195847fa | 3860 | debug.info->a.proc = proc; |
dff98306 | 3861 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 3862 | #endif |
ddd8f927 | 3863 | goto evap1; |
da7f71d7 | 3864 | } |
2ca0d207 DH |
3865 | else |
3866 | goto badfun; | |
0f2d19dd JB |
3867 | case scm_tc7_subr_1: |
3868 | case scm_tc7_subr_2: | |
3869 | case scm_tc7_subr_2o: | |
14b18ed6 | 3870 | case scm_tc7_dsubr: |
0f2d19dd JB |
3871 | case scm_tc7_cxr: |
3872 | case scm_tc7_subr_3: | |
3873 | case scm_tc7_lsubr_2: | |
3874 | umwrongnumargs: | |
3875 | unmemocar (x, env); | |
f5bf2977 | 3876 | scm_wrong_num_args (proc); |
0f2d19dd | 3877 | default: |
ddd8f927 DH |
3878 | badfun: |
3879 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 3880 | } |
6dbd0af5 | 3881 | } |
0f2d19dd JB |
3882 | |
3883 | /* must handle macros by here */ | |
3884 | x = SCM_CDR (x); | |
dff98306 DH |
3885 | if (SCM_CONSP (x)) |
3886 | arg1 = EVALCAR (x, env); | |
680ed4a8 | 3887 | else |
ab1f1094 | 3888 | scm_wrong_num_args (proc); |
6dbd0af5 | 3889 | #ifdef DEVAL |
dff98306 | 3890 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3891 | #endif |
0f2d19dd | 3892 | x = SCM_CDR (x); |
42030fb2 DH |
3893 | { |
3894 | SCM arg2; | |
3895 | if (SCM_NULLP (x)) | |
3896 | { | |
3897 | ENTER_APPLY; | |
3898 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 3899 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3900 | switch (SCM_TYP7 (proc)) |
3901 | { /* have one argument in arg1 */ | |
3902 | case scm_tc7_subr_2o: | |
3903 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3904 | case scm_tc7_subr_1: | |
3905 | case scm_tc7_subr_1o: | |
3906 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
3907 | case scm_tc7_dsubr: |
3908 | if (SCM_INUMP (arg1)) | |
3909 | { | |
3910 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
3911 | } | |
3912 | else if (SCM_REALP (arg1)) | |
3913 | { | |
3914 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
3915 | } | |
3916 | else if (SCM_BIGP (arg1)) | |
3917 | { | |
3918 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
3919 | } | |
f92e85f7 MV |
3920 | else if (SCM_FRACTIONP (arg1)) |
3921 | { | |
3922 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
3923 | } | |
3924 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
14b18ed6 | 3925 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); |
42030fb2 | 3926 | case scm_tc7_cxr: |
42030fb2 | 3927 | { |
14b18ed6 DH |
3928 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
3929 | do | |
3930 | { | |
3931 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
3932 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
3933 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
3934 | pattern >>= 2; | |
3935 | } while (pattern); | |
42030fb2 | 3936 | RETURN (arg1); |
0f2d19dd | 3937 | } |
42030fb2 DH |
3938 | case scm_tc7_rpsubr: |
3939 | RETURN (SCM_BOOL_T); | |
3940 | case scm_tc7_asubr: | |
3941 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3942 | case scm_tc7_lsubr: | |
0f2d19dd | 3943 | #ifdef DEVAL |
42030fb2 | 3944 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 3945 | #else |
42030fb2 | 3946 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 3947 | #endif |
42030fb2 DH |
3948 | case scm_tc7_smob: |
3949 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3950 | goto badfun; | |
3951 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
3952 | case scm_tc7_cclo: | |
3953 | arg2 = arg1; | |
3954 | arg1 = proc; | |
3955 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 3956 | #ifdef DEVAL |
42030fb2 DH |
3957 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3958 | debug.info->a.proc = proc; | |
6dbd0af5 | 3959 | #endif |
42030fb2 DH |
3960 | goto evap2; |
3961 | case scm_tc7_pws: | |
3962 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 3963 | #ifdef DEVAL |
42030fb2 | 3964 | debug.info->a.proc = proc; |
89efbff4 | 3965 | #endif |
42030fb2 DH |
3966 | if (!SCM_CLOSUREP (proc)) |
3967 | goto evap1; | |
ddd8f927 | 3968 | /* fallthrough */ |
42030fb2 | 3969 | case scm_tcs_closures: |
ddd8f927 DH |
3970 | { |
3971 | /* clos1: */ | |
3972 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3973 | if (SCM_NULLP (formals) | |
3974 | || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals)))) | |
3975 | goto umwrongnumargs; | |
3976 | x = SCM_CLOSURE_BODY (proc); | |
0f2d19dd | 3977 | #ifdef DEVAL |
ddd8f927 DH |
3978 | env = SCM_EXTEND_ENV (formals, |
3979 | debug.info->a.args, | |
3980 | SCM_ENV (proc)); | |
0f2d19dd | 3981 | #else |
ddd8f927 DH |
3982 | env = SCM_EXTEND_ENV (formals, |
3983 | scm_list_1 (arg1), | |
3984 | SCM_ENV (proc)); | |
0f2d19dd | 3985 | #endif |
ddd8f927 DH |
3986 | goto nontoplevel_begin; |
3987 | } | |
42030fb2 DH |
3988 | case scm_tcs_struct: |
3989 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3990 | { | |
3991 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 3992 | #ifdef DEVAL |
42030fb2 | 3993 | arg1 = debug.info->a.args; |
f3d2630a | 3994 | #else |
42030fb2 | 3995 | arg1 = scm_list_1 (arg1); |
f3d2630a | 3996 | #endif |
42030fb2 DH |
3997 | goto type_dispatch; |
3998 | } | |
2ca0d207 | 3999 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4000 | { |
4001 | arg2 = arg1; | |
4002 | arg1 = proc; | |
4003 | proc = (SCM_I_ENTITYP (proc) | |
4004 | ? SCM_ENTITY_PROCEDURE (proc) | |
4005 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 4006 | #ifdef DEVAL |
42030fb2 DH |
4007 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
4008 | debug.info->a.proc = proc; | |
0c32d76c | 4009 | #endif |
ddd8f927 | 4010 | goto evap2; |
42030fb2 | 4011 | } |
2ca0d207 DH |
4012 | else |
4013 | goto badfun; | |
42030fb2 DH |
4014 | case scm_tc7_subr_2: |
4015 | case scm_tc7_subr_0: | |
4016 | case scm_tc7_subr_3: | |
4017 | case scm_tc7_lsubr_2: | |
ab1f1094 | 4018 | scm_wrong_num_args (proc); |
42030fb2 DH |
4019 | default: |
4020 | goto badfun; | |
4021 | } | |
4022 | } | |
42030fb2 DH |
4023 | if (SCM_CONSP (x)) |
4024 | arg2 = EVALCAR (x, env); | |
4025 | else | |
ab1f1094 | 4026 | scm_wrong_num_args (proc); |
bd987b8e | 4027 | |
42030fb2 | 4028 | { /* have two or more arguments */ |
6dbd0af5 | 4029 | #ifdef DEVAL |
42030fb2 | 4030 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 4031 | #endif |
42030fb2 DH |
4032 | x = SCM_CDR (x); |
4033 | if (SCM_NULLP (x)) { | |
4034 | ENTER_APPLY; | |
4035 | evap2: | |
ddd8f927 | 4036 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4037 | switch (SCM_TYP7 (proc)) |
4038 | { /* have two arguments */ | |
4039 | case scm_tc7_subr_2: | |
4040 | case scm_tc7_subr_2o: | |
4041 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4042 | case scm_tc7_lsubr: | |
0f2d19dd | 4043 | #ifdef DEVAL |
42030fb2 | 4044 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 4045 | #else |
42030fb2 DH |
4046 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
4047 | #endif | |
4048 | case scm_tc7_lsubr_2: | |
4049 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
4050 | case scm_tc7_rpsubr: | |
4051 | case scm_tc7_asubr: | |
4052 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
4053 | case scm_tc7_smob: | |
4054 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4055 | goto badfun; | |
4056 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
4057 | cclon: | |
4058 | case scm_tc7_cclo: | |
0f2d19dd | 4059 | #ifdef DEVAL |
42030fb2 DH |
4060 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4061 | scm_cons (proc, debug.info->a.args), | |
4062 | SCM_EOL)); | |
0f2d19dd | 4063 | #else |
42030fb2 DH |
4064 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
4065 | scm_cons2 (proc, arg1, | |
4066 | scm_cons (arg2, | |
4067 | scm_eval_args (x, | |
4068 | env, | |
4069 | proc))), | |
4070 | SCM_EOL)); | |
4071 | #endif | |
4072 | case scm_tcs_struct: | |
4073 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4074 | { | |
4075 | x = SCM_ENTITY_PROCEDURE (proc); | |
4076 | #ifdef DEVAL | |
4077 | arg1 = debug.info->a.args; | |
4078 | #else | |
4079 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 4080 | #endif |
42030fb2 DH |
4081 | goto type_dispatch; |
4082 | } | |
2ca0d207 | 4083 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
4084 | { |
4085 | operatorn: | |
f3d2630a | 4086 | #ifdef DEVAL |
42030fb2 DH |
4087 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4088 | ? SCM_ENTITY_PROCEDURE (proc) | |
4089 | : SCM_OPERATOR_PROCEDURE (proc), | |
4090 | scm_cons (proc, debug.info->a.args), | |
4091 | SCM_EOL)); | |
f3d2630a | 4092 | #else |
42030fb2 DH |
4093 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
4094 | ? SCM_ENTITY_PROCEDURE (proc) | |
4095 | : SCM_OPERATOR_PROCEDURE (proc), | |
4096 | scm_cons2 (proc, arg1, | |
4097 | scm_cons (arg2, | |
4098 | scm_eval_args (x, | |
4099 | env, | |
4100 | proc))), | |
4101 | SCM_EOL)); | |
f3d2630a | 4102 | #endif |
42030fb2 | 4103 | } |
2ca0d207 DH |
4104 | else |
4105 | goto badfun; | |
42030fb2 | 4106 | case scm_tc7_subr_0: |
14b18ed6 | 4107 | case scm_tc7_dsubr: |
42030fb2 DH |
4108 | case scm_tc7_cxr: |
4109 | case scm_tc7_subr_1o: | |
4110 | case scm_tc7_subr_1: | |
4111 | case scm_tc7_subr_3: | |
ab1f1094 | 4112 | scm_wrong_num_args (proc); |
42030fb2 | 4113 | default: |
9b07e212 | 4114 | goto badfun; |
42030fb2 DH |
4115 | case scm_tc7_pws: |
4116 | proc = SCM_PROCEDURE (proc); | |
4117 | #ifdef DEVAL | |
4118 | debug.info->a.proc = proc; | |
4119 | #endif | |
4120 | if (!SCM_CLOSUREP (proc)) | |
4121 | goto evap2; | |
ddd8f927 | 4122 | /* fallthrough */ |
42030fb2 | 4123 | case scm_tcs_closures: |
ddd8f927 DH |
4124 | { |
4125 | /* clos2: */ | |
4126 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4127 | if (SCM_NULLP (formals) | |
4128 | || (SCM_CONSP (formals) | |
4129 | && (SCM_NULLP (SCM_CDR (formals)) | |
4130 | || (SCM_CONSP (SCM_CDR (formals)) | |
4131 | && SCM_CONSP (SCM_CDDR (formals)))))) | |
4132 | goto umwrongnumargs; | |
0c32d76c | 4133 | #ifdef DEVAL |
ddd8f927 DH |
4134 | env = SCM_EXTEND_ENV (formals, |
4135 | debug.info->a.args, | |
4136 | SCM_ENV (proc)); | |
195847fa | 4137 | #else |
ddd8f927 DH |
4138 | env = SCM_EXTEND_ENV (formals, |
4139 | scm_list_2 (arg1, arg2), | |
4140 | SCM_ENV (proc)); | |
195847fa | 4141 | #endif |
ddd8f927 DH |
4142 | x = SCM_CLOSURE_BODY (proc); |
4143 | goto nontoplevel_begin; | |
4144 | } | |
42030fb2 DH |
4145 | } |
4146 | } | |
42030fb2 | 4147 | if (!SCM_CONSP (x)) |
ab1f1094 | 4148 | scm_wrong_num_args (proc); |
42030fb2 DH |
4149 | #ifdef DEVAL |
4150 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4151 | deval_args (x, env, proc, | |
4152 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4153 | #endif | |
4154 | ENTER_APPLY; | |
4155 | evap3: | |
ddd8f927 | 4156 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4157 | switch (SCM_TYP7 (proc)) |
4158 | { /* have 3 or more arguments */ | |
4159 | #ifdef DEVAL | |
6dbd0af5 | 4160 | case scm_tc7_subr_3: |
ab1f1094 DH |
4161 | if (!SCM_NULLP (SCM_CDR (x))) |
4162 | scm_wrong_num_args (proc); | |
4163 | else | |
4164 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4165 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4166 | case scm_tc7_asubr: |
4167 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4168 | arg2 = SCM_CDDR (debug.info->a.args); | |
4169 | do | |
4170 | { | |
4171 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4172 | arg2 = SCM_CDR (arg2); | |
4173 | } | |
4174 | while (SCM_NIMP (arg2)); | |
4175 | RETURN (arg1); | |
4176 | case scm_tc7_rpsubr: | |
4177 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4178 | RETURN (SCM_BOOL_F); | |
4179 | arg1 = SCM_CDDR (debug.info->a.args); | |
4180 | do | |
4181 | { | |
4182 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) | |
4183 | RETURN (SCM_BOOL_F); | |
4184 | arg2 = SCM_CAR (arg1); | |
4185 | arg1 = SCM_CDR (arg1); | |
4186 | } | |
4187 | while (SCM_NIMP (arg1)); | |
4188 | RETURN (SCM_BOOL_T); | |
4189 | case scm_tc7_lsubr_2: | |
4190 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4191 | SCM_CDDR (debug.info->a.args))); | |
4192 | case scm_tc7_lsubr: | |
4193 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4194 | case scm_tc7_smob: | |
4195 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4196 | goto badfun; | |
4197 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4198 | SCM_CDDR (debug.info->a.args))); | |
4199 | case scm_tc7_cclo: | |
4200 | goto cclon; | |
002f1a5d MD |
4201 | case scm_tc7_pws: |
4202 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4203 | debug.info->a.proc = proc; |
002f1a5d | 4204 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4205 | goto evap3; |
ddd8f927 | 4206 | /* fallthrough */ |
6dbd0af5 | 4207 | case scm_tcs_closures: |
ddd8f927 DH |
4208 | { |
4209 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4210 | if (SCM_NULLP (formals) | |
4211 | || (SCM_CONSP (formals) | |
4212 | && (SCM_NULLP (SCM_CDR (formals)) | |
4213 | || (SCM_CONSP (SCM_CDR (formals)) | |
4214 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4215 | goto umwrongnumargs; | |
4216 | SCM_SET_ARGSREADY (debug); | |
4217 | env = SCM_EXTEND_ENV (formals, | |
4218 | debug.info->a.args, | |
4219 | SCM_ENV (proc)); | |
4220 | x = SCM_CLOSURE_BODY (proc); | |
4221 | goto nontoplevel_begin; | |
4222 | } | |
6dbd0af5 | 4223 | #else /* DEVAL */ |
42030fb2 | 4224 | case scm_tc7_subr_3: |
ab1f1094 DH |
4225 | if (!SCM_NULLP (SCM_CDR (x))) |
4226 | scm_wrong_num_args (proc); | |
4227 | else | |
4228 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4229 | case scm_tc7_asubr: |
4230 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4231 | do | |
4232 | { | |
4233 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4234 | x = SCM_CDR(x); | |
4235 | } | |
6bff1368 | 4236 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4237 | RETURN (arg1); |
4238 | case scm_tc7_rpsubr: | |
4239 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4240 | RETURN (SCM_BOOL_F); | |
4241 | do | |
4242 | { | |
4243 | arg1 = EVALCAR (x, env); | |
4244 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1))) | |
4245 | RETURN (SCM_BOOL_F); | |
4246 | arg2 = arg1; | |
4247 | x = SCM_CDR (x); | |
4248 | } | |
6bff1368 | 4249 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4250 | RETURN (SCM_BOOL_T); |
4251 | case scm_tc7_lsubr_2: | |
4252 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4253 | case scm_tc7_lsubr: | |
4254 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4255 | arg2, | |
4256 | scm_eval_args (x, env, proc)))); | |
4257 | case scm_tc7_smob: | |
4258 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4259 | goto badfun; | |
4260 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4261 | scm_eval_args (x, env, proc))); | |
4262 | case scm_tc7_cclo: | |
4263 | goto cclon; | |
4264 | case scm_tc7_pws: | |
4265 | proc = SCM_PROCEDURE (proc); | |
4266 | if (!SCM_CLOSUREP (proc)) | |
4267 | goto evap3; | |
ddd8f927 DH |
4268 | /* fallthrough */ |
4269 | case scm_tcs_closures: | |
da7f71d7 | 4270 | { |
ddd8f927 | 4271 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
42030fb2 DH |
4272 | if (SCM_NULLP (formals) |
4273 | || (SCM_CONSP (formals) | |
4274 | && (SCM_NULLP (SCM_CDR (formals)) | |
4275 | || (SCM_CONSP (SCM_CDR (formals)) | |
4276 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4277 | goto umwrongnumargs; | |
ddd8f927 DH |
4278 | env = SCM_EXTEND_ENV (formals, |
4279 | scm_cons2 (arg1, | |
4280 | arg2, | |
4281 | scm_eval_args (x, env, proc)), | |
4282 | SCM_ENV (proc)); | |
4283 | x = SCM_CLOSURE_BODY (proc); | |
4284 | goto nontoplevel_begin; | |
da7f71d7 | 4285 | } |
0f2d19dd | 4286 | #endif /* DEVAL */ |
42030fb2 DH |
4287 | case scm_tcs_struct: |
4288 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4289 | { | |
f3d2630a | 4290 | #ifdef DEVAL |
42030fb2 | 4291 | arg1 = debug.info->a.args; |
f3d2630a | 4292 | #else |
42030fb2 | 4293 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4294 | #endif |
42030fb2 DH |
4295 | x = SCM_ENTITY_PROCEDURE (proc); |
4296 | goto type_dispatch; | |
4297 | } | |
2ca0d207 | 4298 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4299 | goto operatorn; |
2ca0d207 DH |
4300 | else |
4301 | goto badfun; | |
42030fb2 DH |
4302 | case scm_tc7_subr_2: |
4303 | case scm_tc7_subr_1o: | |
4304 | case scm_tc7_subr_2o: | |
4305 | case scm_tc7_subr_0: | |
14b18ed6 | 4306 | case scm_tc7_dsubr: |
42030fb2 DH |
4307 | case scm_tc7_cxr: |
4308 | case scm_tc7_subr_1: | |
ab1f1094 | 4309 | scm_wrong_num_args (proc); |
42030fb2 | 4310 | default: |
9b07e212 | 4311 | goto badfun; |
42030fb2 DH |
4312 | } |
4313 | } | |
0f2d19dd JB |
4314 | } |
4315 | #ifdef DEVAL | |
6dbd0af5 | 4316 | exit: |
5132eef0 | 4317 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4318 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4319 | { |
b7ff98dd MD |
4320 | SCM_CLEAR_TRACED_FRAME (debug); |
4321 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4322 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4323 | else |
4324 | { | |
5f144b10 GH |
4325 | int first; |
4326 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4327 | |
5f144b10 | 4328 | if (first) |
dff98306 | 4329 | arg1 = val; |
5f144b10 | 4330 | else |
6dbd0af5 | 4331 | { |
5f144b10 | 4332 | proc = val; |
6dbd0af5 MD |
4333 | goto ret; |
4334 | } | |
4335 | } | |
d95c0b76 | 4336 | SCM_TRAPS_P = 0; |
dff98306 | 4337 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4338 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4339 | } |
4340 | ret: | |
1646d37b | 4341 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4342 | return proc; |
4343 | #endif | |
4344 | } | |
4345 | ||
6dbd0af5 MD |
4346 | |
4347 | /* SECTION: This code is compiled once. | |
4348 | */ | |
4349 | ||
0f2d19dd JB |
4350 | #ifndef DEVAL |
4351 | ||
fdc28395 | 4352 | \f |
d0b07b5d | 4353 | |
fdc28395 KN |
4354 | /* Simple procedure calls |
4355 | */ | |
4356 | ||
4357 | SCM | |
4358 | scm_call_0 (SCM proc) | |
4359 | { | |
4360 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4361 | } | |
4362 | ||
4363 | SCM | |
4364 | scm_call_1 (SCM proc, SCM arg1) | |
4365 | { | |
4366 | return scm_apply (proc, arg1, scm_listofnull); | |
4367 | } | |
4368 | ||
4369 | SCM | |
4370 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4371 | { | |
4372 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4373 | } | |
4374 | ||
4375 | SCM | |
4376 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4377 | { | |
4378 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4379 | } | |
4380 | ||
d95c0b76 NJ |
4381 | SCM |
4382 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4383 | { | |
4384 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4385 | scm_cons (arg4, scm_listofnull))); | |
4386 | } | |
4387 | ||
fdc28395 KN |
4388 | /* Simple procedure applies |
4389 | */ | |
4390 | ||
4391 | SCM | |
4392 | scm_apply_0 (SCM proc, SCM args) | |
4393 | { | |
4394 | return scm_apply (proc, args, SCM_EOL); | |
4395 | } | |
4396 | ||
4397 | SCM | |
4398 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4399 | { | |
4400 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4401 | } | |
4402 | ||
4403 | SCM | |
4404 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4405 | { | |
4406 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4407 | } | |
4408 | ||
4409 | SCM | |
4410 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4411 | { | |
4412 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4413 | SCM_EOL); | |
4414 | } | |
4415 | ||
82a2622a | 4416 | /* This code processes the arguments to apply: |
b145c172 JB |
4417 | |
4418 | (apply PROC ARG1 ... ARGS) | |
4419 | ||
82a2622a JB |
4420 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4421 | ... arguments onto the front of ARGS, and returns the resulting | |
4422 | list. Note that ARGS is a list; thus, the argument to this | |
4423 | function is a list whose last element is a list. | |
4424 | ||
4425 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4426 | result. apply:nconc2last takes care of building the list of |
4427 | arguments, given (ARG1 ... ARGS). | |
4428 | ||
82a2622a JB |
4429 | Rather than do new consing, apply:nconc2last destroys its argument. |
4430 | On that topic, this code came into my care with the following | |
4431 | beautifully cryptic comment on that topic: "This will only screw | |
4432 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4433 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4434 | |
3b3b36dd | 4435 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4436 | (SCM lst), |
4437 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4438 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4439 | "@var{args}, and returns the resulting list. Note that\n" | |
4440 | "@var{args} is a list; thus, the argument to this function is\n" | |
4441 | "a list whose last element is a list.\n" | |
4442 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4443 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4444 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4445 | { |
4446 | SCM *lloc; | |
34d19ef6 | 4447 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4448 | lloc = &lst; |
c96d76b8 NJ |
4449 | while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be |
4450 | SCM_NULL_OR_NIL_P, but not | |
4451 | needed in 99.99% of cases, | |
4452 | and it could seriously hurt | |
4453 | performance. - Neil */ | |
a23afe53 | 4454 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4455 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4456 | *lloc = SCM_CAR (*lloc); |
4457 | return lst; | |
4458 | } | |
1bbd0b84 | 4459 | #undef FUNC_NAME |
0f2d19dd JB |
4460 | |
4461 | #endif /* !DEVAL */ | |
4462 | ||
6dbd0af5 MD |
4463 | |
4464 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4465 | * It is compiled twice. | |
4466 | */ | |
4467 | ||
0f2d19dd | 4468 | #if 0 |
0f2d19dd | 4469 | SCM |
6e8d25a6 | 4470 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4471 | {} |
4472 | #endif | |
4473 | ||
4474 | #if 0 | |
0f2d19dd | 4475 | SCM |
6e8d25a6 | 4476 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4477 | {} |
0f2d19dd JB |
4478 | #endif |
4479 | ||
1cc91f1b | 4480 | |
82a2622a JB |
4481 | /* Apply a function to a list of arguments. |
4482 | ||
4483 | This function is exported to the Scheme level as taking two | |
4484 | required arguments and a tail argument, as if it were: | |
4485 | (lambda (proc arg1 . args) ...) | |
4486 | Thus, if you just have a list of arguments to pass to a procedure, | |
4487 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4488 | args, pass the first as ARG1, then cons any remaining fixed args | |
4489 | onto the front of your argument list, and pass that as ARGS. */ | |
4490 | ||
0f2d19dd | 4491 | SCM |
1bbd0b84 | 4492 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4493 | { |
0f2d19dd | 4494 | #ifdef DEVAL |
92c2555f MV |
4495 | scm_t_debug_frame debug; |
4496 | scm_t_debug_info debug_vect_body; | |
1646d37b | 4497 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 4498 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4499 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4500 | debug.vect[0].a.proc = proc; |
4501 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 4502 | scm_last_debug_frame = &debug; |
0f2d19dd | 4503 | #else |
434f2f7a | 4504 | if (scm_debug_mode_p) |
0f2d19dd | 4505 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4506 | #endif |
4507 | ||
4508 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4509 | |
4510 | /* If ARGS is the empty list, then we're calling apply with only two | |
4511 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4512 | the case, futz with things so that ARG1 is the first argument to | |
4513 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4514 | rest. |
4515 | ||
4516 | Setting the debug apply frame args this way is pretty messy. | |
4517 | Perhaps we should store arg1 and args directly in the frame as | |
4518 | received, and let scm_frame_arguments unpack them, because that's | |
4519 | a relatively rare operation. This works for now; if the Guile | |
4520 | developer archives are still around, see Mikael's post of | |
4521 | 11-Apr-97. */ | |
0f2d19dd JB |
4522 | if (SCM_NULLP (args)) |
4523 | { | |
4524 | if (SCM_NULLP (arg1)) | |
30000774 JB |
4525 | { |
4526 | arg1 = SCM_UNDEFINED; | |
4527 | #ifdef DEVAL | |
4528 | debug.vect[0].a.args = SCM_EOL; | |
4529 | #endif | |
4530 | } | |
0f2d19dd JB |
4531 | else |
4532 | { | |
30000774 JB |
4533 | #ifdef DEVAL |
4534 | debug.vect[0].a.args = arg1; | |
4535 | #endif | |
0f2d19dd JB |
4536 | args = SCM_CDR (arg1); |
4537 | arg1 = SCM_CAR (arg1); | |
4538 | } | |
4539 | } | |
4540 | else | |
4541 | { | |
0f2d19dd | 4542 | args = scm_nconc2last (args); |
30000774 JB |
4543 | #ifdef DEVAL |
4544 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4545 | #endif | |
0f2d19dd | 4546 | } |
0f2d19dd | 4547 | #ifdef DEVAL |
b6d75948 | 4548 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4549 | { |
4550 | SCM tmp; | |
b7ff98dd | 4551 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4552 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4553 | else |
4554 | { | |
5f144b10 GH |
4555 | int first; |
4556 | ||
4557 | tmp = scm_make_continuation (&first); | |
4558 | if (!first) | |
6dbd0af5 MD |
4559 | goto entap; |
4560 | } | |
d95c0b76 NJ |
4561 | SCM_TRAPS_P = 0; |
4562 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4563 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4564 | } |
4565 | entap: | |
4566 | ENTER_APPLY; | |
4567 | #endif | |
6dbd0af5 | 4568 | tail: |
0f2d19dd JB |
4569 | switch (SCM_TYP7 (proc)) |
4570 | { | |
4571 | case scm_tc7_subr_2o: | |
4572 | args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args); | |
ddea3325 | 4573 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4574 | case scm_tc7_subr_2: |
ab1f1094 DH |
4575 | if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args))) |
4576 | scm_wrong_num_args (proc); | |
0f2d19dd | 4577 | args = SCM_CAR (args); |
ddea3325 | 4578 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4579 | case scm_tc7_subr_0: |
ab1f1094 DH |
4580 | if (!SCM_UNBNDP (arg1)) |
4581 | scm_wrong_num_args (proc); | |
4582 | else | |
4583 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4584 | case scm_tc7_subr_1: |
ab1f1094 DH |
4585 | if (SCM_UNBNDP (arg1)) |
4586 | scm_wrong_num_args (proc); | |
0f2d19dd | 4587 | case scm_tc7_subr_1o: |
ab1f1094 DH |
4588 | if (!SCM_NULLP (args)) |
4589 | scm_wrong_num_args (proc); | |
4590 | else | |
4591 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
4592 | case scm_tc7_dsubr: |
4593 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) | |
4594 | scm_wrong_num_args (proc); | |
4595 | if (SCM_INUMP (arg1)) | |
4596 | { | |
4597 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4598 | } | |
4599 | else if (SCM_REALP (arg1)) | |
4600 | { | |
4601 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4602 | } | |
4603 | else if (SCM_BIGP (arg1)) | |
f92e85f7 MV |
4604 | { |
4605 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4606 | } | |
4607 | else if (SCM_FRACTIONP (arg1)) | |
4608 | { | |
4609 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4610 | } | |
14b18ed6 DH |
4611 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4612 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
0f2d19dd | 4613 | case scm_tc7_cxr: |
ab1f1094 DH |
4614 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) |
4615 | scm_wrong_num_args (proc); | |
0f2d19dd | 4616 | { |
14b18ed6 DH |
4617 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4618 | do | |
4619 | { | |
4620 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4621 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4622 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4623 | pattern >>= 2; | |
4624 | } while (pattern); | |
4625 | RETURN (arg1); | |
0f2d19dd JB |
4626 | } |
4627 | case scm_tc7_subr_3: | |
ab1f1094 DH |
4628 | if (SCM_NULLP (args) |
4629 | || SCM_NULLP (SCM_CDR (args)) | |
4630 | || !SCM_NULLP (SCM_CDDR (args))) | |
4631 | scm_wrong_num_args (proc); | |
4632 | else | |
4633 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4634 | case scm_tc7_lsubr: |
4635 | #ifdef DEVAL | |
ddea3325 | 4636 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4637 | #else |
ddea3325 | 4638 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4639 | #endif |
4640 | case scm_tc7_lsubr_2: | |
ab1f1094 DH |
4641 | if (!SCM_CONSP (args)) |
4642 | scm_wrong_num_args (proc); | |
4643 | else | |
4644 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd JB |
4645 | case scm_tc7_asubr: |
4646 | if (SCM_NULLP (args)) | |
ddea3325 | 4647 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4648 | while (SCM_NIMP (args)) |
4649 | { | |
4650 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4651 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); | |
4652 | args = SCM_CDR (args); | |
4653 | } | |
4654 | RETURN (arg1); | |
4655 | case scm_tc7_rpsubr: | |
4656 | if (SCM_NULLP (args)) | |
4657 | RETURN (SCM_BOOL_T); | |
4658 | while (SCM_NIMP (args)) | |
4659 | { | |
4660 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4661 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) | |
4662 | RETURN (SCM_BOOL_F); | |
4663 | arg1 = SCM_CAR (args); | |
4664 | args = SCM_CDR (args); | |
4665 | } | |
4666 | RETURN (SCM_BOOL_T); | |
4667 | case scm_tcs_closures: | |
4668 | #ifdef DEVAL | |
6dbd0af5 | 4669 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4670 | #else |
4671 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4672 | #endif | |
726d810a | 4673 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4674 | scm_wrong_num_args (proc); |
1609038c MD |
4675 | |
4676 | /* Copy argument list */ | |
4677 | if (SCM_IMP (arg1)) | |
4678 | args = arg1; | |
4679 | else | |
4680 | { | |
4681 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
05b15362 | 4682 | for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4683 | { |
05b15362 | 4684 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4685 | tl = SCM_CDR (tl); |
4686 | } | |
4687 | SCM_SETCDR (tl, arg1); | |
4688 | } | |
4689 | ||
821f18a4 DH |
4690 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4691 | args, | |
4692 | SCM_ENV (proc)); | |
f9450cdb | 4693 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4694 | again: |
05b15362 DH |
4695 | arg1 = SCM_CDR (proc); |
4696 | while (!SCM_NULLP (arg1)) | |
2ddb0920 MD |
4697 | { |
4698 | if (SCM_IMP (SCM_CAR (proc))) | |
4699 | { | |
4700 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4701 | { | |
28d52ebb | 4702 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4703 | /* check for race condition */ |
4704 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4705 | m_expand_body (proc, args); |
28d52ebb | 4706 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4707 | goto again; |
2ddb0920 | 4708 | } |
5280aaca | 4709 | else |
17fa3fcf | 4710 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4711 | } |
4712 | else | |
b1cb24ff | 4713 | (void) EVAL (SCM_CAR (proc), args); |
e791c18f | 4714 | proc = arg1; |
05b15362 | 4715 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4716 | } |
e791c18f | 4717 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4718 | case scm_tc7_smob: |
68b06924 | 4719 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4720 | goto badproc; |
afa38f6e | 4721 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4722 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
afa38f6e | 4723 | else if (SCM_NULLP (args)) |
ddea3325 | 4724 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
0717dfd8 | 4725 | else if (SCM_NULLP (SCM_CDR (args))) |
ddea3325 | 4726 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4727 | else |
68b06924 | 4728 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4729 | case scm_tc7_cclo: |
4730 | #ifdef DEVAL | |
6dbd0af5 MD |
4731 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4732 | arg1 = proc; | |
4733 | proc = SCM_CCLO_SUBR (proc); | |
4734 | debug.vect[0].a.proc = proc; | |
4735 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4736 | #else |
4737 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4738 | arg1 = proc; |
4739 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4740 | #endif |
0f2d19dd | 4741 | goto tail; |
89efbff4 MD |
4742 | case scm_tc7_pws: |
4743 | proc = SCM_PROCEDURE (proc); | |
4744 | #ifdef DEVAL | |
4745 | debug.vect[0].a.proc = proc; | |
4746 | #endif | |
4747 | goto tail; | |
904a077d | 4748 | case scm_tcs_struct: |
f3d2630a MD |
4749 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4750 | { | |
4751 | #ifdef DEVAL | |
4752 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4753 | #else | |
4754 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4755 | #endif | |
195847fa | 4756 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4757 | } |
2ca0d207 | 4758 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4759 | { |
504d99c5 | 4760 | /* operator */ |
da7f71d7 MD |
4761 | #ifdef DEVAL |
4762 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4763 | #else | |
4764 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4765 | #endif | |
4766 | arg1 = proc; | |
195847fa MD |
4767 | proc = (SCM_I_ENTITYP (proc) |
4768 | ? SCM_ENTITY_PROCEDURE (proc) | |
4769 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4770 | #ifdef DEVAL |
4771 | debug.vect[0].a.proc = proc; | |
4772 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4773 | #endif | |
195847fa MD |
4774 | if (SCM_NIMP (proc)) |
4775 | goto tail; | |
4776 | else | |
4777 | goto badproc; | |
da7f71d7 | 4778 | } |
2ca0d207 DH |
4779 | else |
4780 | goto badproc; | |
0f2d19dd JB |
4781 | default: |
4782 | badproc: | |
db4b4ca6 | 4783 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
4784 | } |
4785 | #ifdef DEVAL | |
6dbd0af5 | 4786 | exit: |
5132eef0 | 4787 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4788 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4789 | { |
b7ff98dd MD |
4790 | SCM_CLEAR_TRACED_FRAME (debug); |
4791 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 4792 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4793 | else |
4794 | { | |
5f144b10 GH |
4795 | int first; |
4796 | SCM val = scm_make_continuation (&first); | |
4797 | ||
4798 | if (first) | |
4799 | arg1 = val; | |
4800 | else | |
6dbd0af5 | 4801 | { |
5f144b10 | 4802 | proc = val; |
6dbd0af5 MD |
4803 | goto ret; |
4804 | } | |
4805 | } | |
d95c0b76 NJ |
4806 | SCM_TRAPS_P = 0; |
4807 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
4808 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4809 | } |
4810 | ret: | |
1646d37b | 4811 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4812 | return proc; |
4813 | #endif | |
4814 | } | |
4815 | ||
6dbd0af5 MD |
4816 | |
4817 | /* SECTION: The rest of this file is only read once. | |
4818 | */ | |
4819 | ||
0f2d19dd JB |
4820 | #ifndef DEVAL |
4821 | ||
504d99c5 MD |
4822 | /* Trampolines |
4823 | * | |
4824 | * Trampolines make it possible to move procedure application dispatch | |
4825 | * outside inner loops. The motivation was clean implementation of | |
4826 | * efficient replacements of R5RS primitives in SRFI-1. | |
4827 | * | |
4828 | * The semantics is clear: scm_trampoline_N returns an optimized | |
4829 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
4830 | * on N args). | |
4831 | * | |
4832 | * Applying the optimization to map and for-each increased efficiency | |
4833 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
4834 | * before. | |
4835 | */ | |
4836 | ||
756414cf MD |
4837 | static SCM |
4838 | call_subr0_0 (SCM proc) | |
4839 | { | |
4840 | return SCM_SUBRF (proc) (); | |
4841 | } | |
4842 | ||
4843 | static SCM | |
4844 | call_subr1o_0 (SCM proc) | |
4845 | { | |
4846 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
4847 | } | |
4848 | ||
4849 | static SCM | |
4850 | call_lsubr_0 (SCM proc) | |
4851 | { | |
4852 | return SCM_SUBRF (proc) (SCM_EOL); | |
4853 | } | |
4854 | ||
4855 | SCM | |
4856 | scm_i_call_closure_0 (SCM proc) | |
4857 | { | |
6a3f13f0 DH |
4858 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4859 | SCM_EOL, | |
4860 | SCM_ENV (proc)); | |
4861 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4862 | return result; |
756414cf MD |
4863 | } |
4864 | ||
4865 | scm_t_trampoline_0 | |
4866 | scm_trampoline_0 (SCM proc) | |
4867 | { | |
2510c810 DH |
4868 | scm_t_trampoline_0 trampoline; |
4869 | ||
756414cf | 4870 | if (SCM_IMP (proc)) |
d0b07b5d | 4871 | return NULL; |
2510c810 | 4872 | |
756414cf MD |
4873 | switch (SCM_TYP7 (proc)) |
4874 | { | |
4875 | case scm_tc7_subr_0: | |
2510c810 DH |
4876 | trampoline = call_subr0_0; |
4877 | break; | |
756414cf | 4878 | case scm_tc7_subr_1o: |
2510c810 DH |
4879 | trampoline = call_subr1o_0; |
4880 | break; | |
756414cf | 4881 | case scm_tc7_lsubr: |
2510c810 DH |
4882 | trampoline = call_lsubr_0; |
4883 | break; | |
756414cf MD |
4884 | case scm_tcs_closures: |
4885 | { | |
4886 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b | 4887 | if (SCM_NULLP (formals) || !SCM_CONSP (formals)) |
2510c810 | 4888 | trampoline = scm_i_call_closure_0; |
756414cf | 4889 | else |
d0b07b5d | 4890 | return NULL; |
2510c810 | 4891 | break; |
756414cf MD |
4892 | } |
4893 | case scm_tcs_struct: | |
4894 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4895 | trampoline = scm_call_generic_0; |
2ca0d207 | 4896 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4897 | trampoline = scm_call_0; |
4898 | else | |
4899 | return NULL; | |
4900 | break; | |
756414cf MD |
4901 | case scm_tc7_smob: |
4902 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4903 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 4904 | else |
d0b07b5d | 4905 | return NULL; |
2510c810 | 4906 | break; |
756414cf MD |
4907 | case scm_tc7_asubr: |
4908 | case scm_tc7_rpsubr: | |
4909 | case scm_tc7_cclo: | |
4910 | case scm_tc7_pws: | |
2510c810 DH |
4911 | trampoline = scm_call_0; |
4912 | break; | |
756414cf | 4913 | default: |
2510c810 | 4914 | return NULL; /* not applicable on zero arguments */ |
756414cf | 4915 | } |
2510c810 DH |
4916 | /* We only reach this point if a valid trampoline was determined. */ |
4917 | ||
4918 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4919 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
434f2f7a | 4920 | if (scm_debug_mode_p) |
2510c810 DH |
4921 | return scm_call_0; |
4922 | else | |
4923 | return trampoline; | |
756414cf MD |
4924 | } |
4925 | ||
504d99c5 MD |
4926 | static SCM |
4927 | call_subr1_1 (SCM proc, SCM arg1) | |
4928 | { | |
4929 | return SCM_SUBRF (proc) (arg1); | |
4930 | } | |
4931 | ||
9ed24633 MD |
4932 | static SCM |
4933 | call_subr2o_1 (SCM proc, SCM arg1) | |
4934 | { | |
4935 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
4936 | } | |
4937 | ||
504d99c5 MD |
4938 | static SCM |
4939 | call_lsubr_1 (SCM proc, SCM arg1) | |
4940 | { | |
4941 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
4942 | } | |
4943 | ||
4944 | static SCM | |
4945 | call_dsubr_1 (SCM proc, SCM arg1) | |
4946 | { | |
4947 | if (SCM_INUMP (arg1)) | |
4948 | { | |
4949 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4950 | } | |
4951 | else if (SCM_REALP (arg1)) | |
4952 | { | |
4953 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4954 | } | |
504d99c5 | 4955 | else if (SCM_BIGP (arg1)) |
f92e85f7 MV |
4956 | { |
4957 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4958 | } | |
4959 | else if (SCM_FRACTIONP (arg1)) | |
4960 | { | |
4961 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4962 | } | |
504d99c5 MD |
4963 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4964 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4965 | } | |
4966 | ||
4967 | static SCM | |
4968 | call_cxr_1 (SCM proc, SCM arg1) | |
4969 | { | |
14b18ed6 DH |
4970 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4971 | do | |
4972 | { | |
4973 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4974 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4975 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4976 | pattern >>= 2; | |
4977 | } while (pattern); | |
4978 | return arg1; | |
504d99c5 MD |
4979 | } |
4980 | ||
4981 | static SCM | |
4982 | call_closure_1 (SCM proc, SCM arg1) | |
4983 | { | |
6a3f13f0 DH |
4984 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4985 | scm_list_1 (arg1), | |
4986 | SCM_ENV (proc)); | |
4987 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4988 | return result; |
504d99c5 MD |
4989 | } |
4990 | ||
4991 | scm_t_trampoline_1 | |
4992 | scm_trampoline_1 (SCM proc) | |
4993 | { | |
2510c810 DH |
4994 | scm_t_trampoline_1 trampoline; |
4995 | ||
504d99c5 | 4996 | if (SCM_IMP (proc)) |
d0b07b5d | 4997 | return NULL; |
2510c810 | 4998 | |
504d99c5 MD |
4999 | switch (SCM_TYP7 (proc)) |
5000 | { | |
5001 | case scm_tc7_subr_1: | |
5002 | case scm_tc7_subr_1o: | |
2510c810 DH |
5003 | trampoline = call_subr1_1; |
5004 | break; | |
9ed24633 | 5005 | case scm_tc7_subr_2o: |
2510c810 DH |
5006 | trampoline = call_subr2o_1; |
5007 | break; | |
504d99c5 | 5008 | case scm_tc7_lsubr: |
2510c810 DH |
5009 | trampoline = call_lsubr_1; |
5010 | break; | |
14b18ed6 | 5011 | case scm_tc7_dsubr: |
2510c810 DH |
5012 | trampoline = call_dsubr_1; |
5013 | break; | |
504d99c5 | 5014 | case scm_tc7_cxr: |
2510c810 DH |
5015 | trampoline = call_cxr_1; |
5016 | break; | |
504d99c5 MD |
5017 | case scm_tcs_closures: |
5018 | { | |
5019 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
5020 | if (!SCM_NULLP (formals) |
5021 | && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals)))) | |
2510c810 | 5022 | trampoline = call_closure_1; |
504d99c5 | 5023 | else |
d0b07b5d | 5024 | return NULL; |
2510c810 | 5025 | break; |
504d99c5 MD |
5026 | } |
5027 | case scm_tcs_struct: | |
5028 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5029 | trampoline = scm_call_generic_1; |
2ca0d207 | 5030 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5031 | trampoline = scm_call_1; |
5032 | else | |
5033 | return NULL; | |
5034 | break; | |
504d99c5 MD |
5035 | case scm_tc7_smob: |
5036 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5037 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 5038 | else |
d0b07b5d | 5039 | return NULL; |
2510c810 | 5040 | break; |
504d99c5 MD |
5041 | case scm_tc7_asubr: |
5042 | case scm_tc7_rpsubr: | |
5043 | case scm_tc7_cclo: | |
5044 | case scm_tc7_pws: | |
2510c810 DH |
5045 | trampoline = scm_call_1; |
5046 | break; | |
504d99c5 | 5047 | default: |
d0b07b5d | 5048 | return NULL; /* not applicable on one arg */ |
504d99c5 | 5049 | } |
2510c810 DH |
5050 | /* We only reach this point if a valid trampoline was determined. */ |
5051 | ||
5052 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5053 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
434f2f7a | 5054 | if (scm_debug_mode_p) |
2510c810 DH |
5055 | return scm_call_1; |
5056 | else | |
5057 | return trampoline; | |
504d99c5 MD |
5058 | } |
5059 | ||
5060 | static SCM | |
5061 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5062 | { | |
5063 | return SCM_SUBRF (proc) (arg1, arg2); | |
5064 | } | |
5065 | ||
9ed24633 MD |
5066 | static SCM |
5067 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
5068 | { | |
5069 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
5070 | } | |
5071 | ||
504d99c5 MD |
5072 | static SCM |
5073 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
5074 | { | |
5075 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
5076 | } | |
5077 | ||
5078 | static SCM | |
5079 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
5080 | { | |
6a3f13f0 DH |
5081 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
5082 | scm_list_2 (arg1, arg2), | |
5083 | SCM_ENV (proc)); | |
5084 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 5085 | return result; |
504d99c5 MD |
5086 | } |
5087 | ||
5088 | scm_t_trampoline_2 | |
5089 | scm_trampoline_2 (SCM proc) | |
5090 | { | |
2510c810 DH |
5091 | scm_t_trampoline_2 trampoline; |
5092 | ||
504d99c5 | 5093 | if (SCM_IMP (proc)) |
d0b07b5d | 5094 | return NULL; |
2510c810 | 5095 | |
504d99c5 MD |
5096 | switch (SCM_TYP7 (proc)) |
5097 | { | |
5098 | case scm_tc7_subr_2: | |
5099 | case scm_tc7_subr_2o: | |
5100 | case scm_tc7_rpsubr: | |
5101 | case scm_tc7_asubr: | |
2510c810 DH |
5102 | trampoline = call_subr2_2; |
5103 | break; | |
9ed24633 | 5104 | case scm_tc7_lsubr_2: |
2510c810 DH |
5105 | trampoline = call_lsubr2_2; |
5106 | break; | |
504d99c5 | 5107 | case scm_tc7_lsubr: |
2510c810 DH |
5108 | trampoline = call_lsubr_2; |
5109 | break; | |
504d99c5 MD |
5110 | case scm_tcs_closures: |
5111 | { | |
5112 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
5113 | if (!SCM_NULLP (formals) |
5114 | && (!SCM_CONSP (formals) | |
5115 | || (!SCM_NULLP (SCM_CDR (formals)) | |
5116 | && (!SCM_CONSP (SCM_CDR (formals)) | |
5117 | || !SCM_CONSP (SCM_CDDR (formals)))))) | |
2510c810 | 5118 | trampoline = call_closure_2; |
504d99c5 | 5119 | else |
d0b07b5d | 5120 | return NULL; |
2510c810 | 5121 | break; |
504d99c5 MD |
5122 | } |
5123 | case scm_tcs_struct: | |
5124 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5125 | trampoline = scm_call_generic_2; |
2ca0d207 | 5126 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5127 | trampoline = scm_call_2; |
5128 | else | |
5129 | return NULL; | |
5130 | break; | |
504d99c5 MD |
5131 | case scm_tc7_smob: |
5132 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5133 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5134 | else |
d0b07b5d | 5135 | return NULL; |
2510c810 | 5136 | break; |
504d99c5 MD |
5137 | case scm_tc7_cclo: |
5138 | case scm_tc7_pws: | |
2510c810 DH |
5139 | trampoline = scm_call_2; |
5140 | break; | |
504d99c5 | 5141 | default: |
d0b07b5d | 5142 | return NULL; /* not applicable on two args */ |
504d99c5 | 5143 | } |
2510c810 DH |
5144 | /* We only reach this point if a valid trampoline was determined. */ |
5145 | ||
5146 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5147 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
434f2f7a | 5148 | if (scm_debug_mode_p) |
2510c810 DH |
5149 | return scm_call_2; |
5150 | else | |
5151 | return trampoline; | |
504d99c5 MD |
5152 | } |
5153 | ||
d9c393f5 JB |
5154 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5155 | ||
47c3f06d | 5156 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5157 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5158 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5159 | static inline void |
47c3f06d | 5160 | check_map_args (SCM argv, |
c014a02e | 5161 | long len, |
47c3f06d MD |
5162 | SCM gf, |
5163 | SCM proc, | |
5164 | SCM args, | |
5165 | const char *who) | |
d9c393f5 | 5166 | { |
34d19ef6 | 5167 | SCM const *ve = SCM_VELTS (argv); |
c014a02e | 5168 | long i; |
d9c393f5 | 5169 | |
b5c2579a | 5170 | for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5171 | { |
c014a02e | 5172 | long elt_len = scm_ilength (ve[i]); |
d9c393f5 JB |
5173 | |
5174 | if (elt_len < 0) | |
47c3f06d MD |
5175 | { |
5176 | if (gf) | |
5177 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5178 | else | |
5179 | scm_wrong_type_arg (who, i + 2, ve[i]); | |
5180 | } | |
d9c393f5 JB |
5181 | |
5182 | if (elt_len != len) | |
504d99c5 | 5183 | scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2)); |
d9c393f5 JB |
5184 | } |
5185 | ||
5d2b97cd | 5186 | scm_remember_upto_here_1 (argv); |
d9c393f5 JB |
5187 | } |
5188 | ||
5189 | ||
47c3f06d | 5190 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5191 | |
368bf056 MD |
5192 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5193 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5194 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5195 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5196 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5197 | */ |
5198 | ||
0f2d19dd | 5199 | SCM |
1bbd0b84 | 5200 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5201 | #define FUNC_NAME s_map |
0f2d19dd | 5202 | { |
c014a02e | 5203 | long i, len; |
0f2d19dd JB |
5204 | SCM res = SCM_EOL; |
5205 | SCM *pres = &res; | |
34d19ef6 | 5206 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
0f2d19dd | 5207 | |
d9c393f5 | 5208 | len = scm_ilength (arg1); |
47c3f06d MD |
5209 | SCM_GASSERTn (len >= 0, |
5210 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5211 | SCM_VALIDATE_REST_ARGUMENT (args); |
0f2d19dd JB |
5212 | if (SCM_NULLP (args)) |
5213 | { | |
504d99c5 MD |
5214 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5215 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5216 | while (SCM_NIMP (arg1)) | |
5217 | { | |
5218 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5219 | pres = SCM_CDRLOC (*pres); | |
5220 | arg1 = SCM_CDR (arg1); | |
5221 | } | |
5222 | return res; | |
5223 | } | |
5224 | if (SCM_NULLP (SCM_CDR (args))) | |
5225 | { | |
5226 | SCM arg2 = SCM_CAR (args); | |
5227 | int len2 = scm_ilength (arg2); | |
5228 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5229 | SCM_GASSERTn (call, | |
5230 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5231 | SCM_GASSERTn (len2 >= 0, | |
5232 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5233 | if (len2 != len) | |
5234 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5235 | while (SCM_NIMP (arg1)) |
5236 | { | |
504d99c5 | 5237 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5238 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5239 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5240 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5241 | } |
5242 | return res; | |
5243 | } | |
05b15362 DH |
5244 | arg1 = scm_cons (arg1, args); |
5245 | args = scm_vector (arg1); | |
0f2d19dd | 5246 | ve = SCM_VELTS (args); |
47c3f06d | 5247 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5248 | while (1) |
5249 | { | |
5250 | arg1 = SCM_EOL; | |
b5c2579a | 5251 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5252 | { |
d9c393f5 JB |
5253 | if (SCM_IMP (ve[i])) |
5254 | return res; | |
0f2d19dd | 5255 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5256 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd | 5257 | } |
8ea46249 | 5258 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5259 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5260 | } |
5261 | } | |
af45e3b0 | 5262 | #undef FUNC_NAME |
0f2d19dd JB |
5263 | |
5264 | ||
47c3f06d | 5265 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5266 | |
0f2d19dd | 5267 | SCM |
1bbd0b84 | 5268 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5269 | #define FUNC_NAME s_for_each |
0f2d19dd | 5270 | { |
34d19ef6 | 5271 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
c014a02e | 5272 | long i, len; |
d9c393f5 | 5273 | len = scm_ilength (arg1); |
47c3f06d MD |
5274 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5275 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5276 | SCM_VALIDATE_REST_ARGUMENT (args); |
c96d76b8 | 5277 | if (SCM_NULLP (args)) |
0f2d19dd | 5278 | { |
504d99c5 MD |
5279 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5280 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5281 | while (SCM_NIMP (arg1)) | |
5282 | { | |
5283 | call (proc, SCM_CAR (arg1)); | |
5284 | arg1 = SCM_CDR (arg1); | |
5285 | } | |
5286 | return SCM_UNSPECIFIED; | |
5287 | } | |
5288 | if (SCM_NULLP (SCM_CDR (args))) | |
5289 | { | |
5290 | SCM arg2 = SCM_CAR (args); | |
5291 | int len2 = scm_ilength (arg2); | |
5292 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5293 | SCM_GASSERTn (call, g_for_each, | |
5294 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5295 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5296 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5297 | if (len2 != len) | |
5298 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5299 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5300 | { |
504d99c5 | 5301 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5302 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5303 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5304 | } |
5305 | return SCM_UNSPECIFIED; | |
5306 | } | |
05b15362 DH |
5307 | arg1 = scm_cons (arg1, args); |
5308 | args = scm_vector (arg1); | |
0f2d19dd | 5309 | ve = SCM_VELTS (args); |
47c3f06d | 5310 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5311 | while (1) |
5312 | { | |
5313 | arg1 = SCM_EOL; | |
b5c2579a | 5314 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5315 | { |
c96d76b8 NJ |
5316 | if (SCM_IMP (ve[i])) |
5317 | return SCM_UNSPECIFIED; | |
0f2d19dd | 5318 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5319 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd JB |
5320 | } |
5321 | scm_apply (proc, arg1, SCM_EOL); | |
5322 | } | |
5323 | } | |
af45e3b0 | 5324 | #undef FUNC_NAME |
0f2d19dd | 5325 | |
1cc91f1b | 5326 | |
0f2d19dd | 5327 | SCM |
6e8d25a6 | 5328 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5329 | { |
16d4699b MV |
5330 | SCM z; |
5331 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5332 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5333 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5334 | return z; |
5335 | } | |
5336 | ||
5337 | ||
92c2555f | 5338 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5339 | |
0f2d19dd | 5340 | SCM |
6e8d25a6 | 5341 | scm_makprom (SCM code) |
0f2d19dd | 5342 | { |
28d52ebb MD |
5343 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5344 | SCM_UNPACK (code), | |
5345 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
5346 | } |
5347 | ||
28d52ebb MD |
5348 | static size_t |
5349 | promise_free (SCM promise) | |
5350 | { | |
5351 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
5352 | return 0; | |
5353 | } | |
1cc91f1b | 5354 | |
0f2d19dd | 5355 | static int |
e841c3e0 | 5356 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5357 | { |
19402679 | 5358 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5359 | scm_puts ("#<promise ", port); |
19402679 | 5360 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5361 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5362 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5363 | scm_putc ('>', port); |
0f2d19dd JB |
5364 | return !0; |
5365 | } | |
5366 | ||
3b3b36dd | 5367 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5368 | (SCM promise), |
67e8151b MG |
5369 | "If the promise @var{x} has not been computed yet, compute and\n" |
5370 | "return @var{x}, otherwise just return the previously computed\n" | |
5371 | "value.") | |
1bbd0b84 | 5372 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5373 | { |
28d52ebb MD |
5374 | SCM_VALIDATE_SMOB (1, promise, promise); |
5375 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
5376 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5377 | { |
28d52ebb MD |
5378 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5379 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5380 | { |
28d52ebb MD |
5381 | SCM_SET_PROMISE_DATA (promise, ans); |
5382 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5383 | } |
5384 | } | |
28d52ebb MD |
5385 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
5386 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 5387 | } |
1bbd0b84 | 5388 | #undef FUNC_NAME |
0f2d19dd | 5389 | |
445f675c | 5390 | |
a1ec6916 | 5391 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5392 | (SCM obj), |
b380b885 | 5393 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5394 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5395 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5396 | { |
67e8151b | 5397 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5398 | } |
1bbd0b84 | 5399 | #undef FUNC_NAME |
0f2d19dd | 5400 | |
445f675c | 5401 | |
a1ec6916 | 5402 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5403 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5404 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5405 | "Any source properties associated with @var{xorig} are also associated\n" | |
5406 | "with the new pair.") | |
1bbd0b84 | 5407 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5408 | { |
5409 | SCM p, z; | |
16d4699b | 5410 | z = scm_cons (x, y); |
26d5b9b4 MD |
5411 | /* Copy source properties possibly associated with xorig. */ |
5412 | p = scm_whash_lookup (scm_source_whash, xorig); | |
445f675c | 5413 | if (!SCM_IMP (p)) |
26d5b9b4 MD |
5414 | scm_whash_insert (scm_source_whash, z, p); |
5415 | return z; | |
5416 | } | |
1bbd0b84 | 5417 | #undef FUNC_NAME |
26d5b9b4 | 5418 | |
445f675c | 5419 | |
62360b89 DH |
5420 | /* The function scm_copy_tree is used to copy an expression tree to allow the |
5421 | * memoizer to modify the expression during memoization. scm_copy_tree | |
5422 | * creates deep copies of pairs and vectors, but not of any other data types, | |
5423 | * since only pairs and vectors will be parsed by the memoizer. | |
5424 | * | |
5425 | * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise | |
5426 | * pattern is used to detect cycles. In fact, the pattern is used in two | |
5427 | * dimensions, vertical (indicated in the code by the variable names 'hare' | |
5428 | * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both | |
5429 | * dimensions, the hare/rabbit will take two steps when the tortoise/turtle | |
5430 | * takes one. | |
5431 | * | |
5432 | * The vertical dimension corresponds to recursive calls to function | |
5433 | * copy_tree: This happens when descending into vector elements, into cars of | |
5434 | * lists and into the cdr of an improper list. In this dimension, the | |
5435 | * tortoise follows the hare by using the processor stack: Every stack frame | |
5436 | * will hold an instance of struct t_trace. These instances are connected in | |
5437 | * a way that represents the trace of the hare, which thus can be followed by | |
5438 | * the tortoise. The tortoise will always point to struct t_trace instances | |
5439 | * relating to SCM objects that have already been copied. Thus, a cycle is | |
5440 | * detected if the tortoise and the hare point to the same object, | |
5441 | * | |
5442 | * The horizontal dimension is within one execution of copy_tree, when the | |
5443 | * function cdr's along the pairs of a list. This is the standard | |
5444 | * hare-and-tortoise implementation, found several times in guile. */ | |
5445 | ||
5446 | struct t_trace { | |
5447 | struct t_trace *trace; // These pointers form a trace along the stack. | |
5448 | SCM obj; // The object handled at the respective stack frame. | |
5449 | }; | |
5450 | ||
5451 | static SCM | |
5452 | copy_tree ( | |
5453 | struct t_trace *const hare, | |
5454 | struct t_trace *tortoise, | |
5455 | unsigned int tortoise_delay ) | |
5456 | { | |
5457 | if (!SCM_CONSP (hare->obj) && !SCM_VECTORP (hare->obj)) | |
5458 | { | |
5459 | return hare->obj; | |
5460 | } | |
5461 | else | |
5462 | { | |
5463 | /* Prepare the trace along the stack. */ | |
5464 | struct t_trace new_hare; | |
5465 | hare->trace = &new_hare; | |
5466 | ||
5467 | /* The tortoise will make its step after the delay has elapsed. Note | |
5468 | * that in contrast to the typical hare-and-tortoise pattern, the step | |
5469 | * of the tortoise happens before the hare takes its steps. This is, in | |
5470 | * principle, no problem, except for the start of the algorithm: Then, | |
5fb64383 | 5471 | * it has to be made sure that the hare actually gets its advantage of |
62360b89 DH |
5472 | * two steps. */ |
5473 | if (tortoise_delay == 0) | |
5474 | { | |
5475 | tortoise_delay = 1; | |
5476 | tortoise = tortoise->trace; | |
5477 | ASSERT_SYNTAX (!SCM_EQ_P (hare->obj, tortoise->obj), | |
5478 | s_bad_expression, hare->obj); | |
5479 | } | |
5480 | else | |
5481 | { | |
5482 | --tortoise_delay; | |
5483 | } | |
5484 | ||
5485 | if (SCM_VECTORP (hare->obj)) | |
5486 | { | |
5487 | const unsigned long int length = SCM_VECTOR_LENGTH (hare->obj); | |
5488 | const SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED); | |
5489 | ||
5490 | /* Each vector element is copied by recursing into copy_tree, having | |
5491 | * the tortoise follow the hare into the depths of the stack. */ | |
5492 | unsigned long int i; | |
5493 | for (i = 0; i < length; ++i) | |
5494 | { | |
5495 | SCM new_element; | |
5496 | new_hare.obj = SCM_VECTOR_REF (hare->obj, i); | |
5497 | new_element = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5498 | SCM_VECTOR_SET (new_vector, i, new_element); | |
5499 | } | |
5500 | ||
5501 | return new_vector; | |
5502 | } | |
5503 | else // SCM_CONSP (hare->obj) | |
5504 | { | |
5505 | SCM result; | |
5506 | SCM tail; | |
5507 | ||
5508 | SCM rabbit = hare->obj; | |
5509 | SCM turtle = hare->obj; | |
5510 | ||
5511 | SCM copy; | |
5512 | ||
5513 | /* The first pair of the list is treated specially, in order to | |
5514 | * preserve a potential source code position. */ | |
5515 | result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL); | |
5516 | new_hare.obj = SCM_CAR (rabbit); | |
5517 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5518 | SCM_SETCAR (tail, copy); | |
5519 | ||
5520 | /* The remaining pairs of the list are copied by, horizontally, | |
5521 | * having the turtle follow the rabbit, and, vertically, having the | |
5522 | * tortoise follow the hare into the depths of the stack. */ | |
5523 | rabbit = SCM_CDR (rabbit); | |
5524 | while (SCM_CONSP (rabbit)) | |
5525 | { | |
5526 | new_hare.obj = SCM_CAR (rabbit); | |
5527 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5528 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5529 | tail = SCM_CDR (tail); | |
5530 | ||
5531 | rabbit = SCM_CDR (rabbit); | |
5532 | if (SCM_CONSP (rabbit)) | |
5533 | { | |
5534 | new_hare.obj = SCM_CAR (rabbit); | |
5535 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5536 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5537 | tail = SCM_CDR (tail); | |
5538 | rabbit = SCM_CDR (rabbit); | |
5539 | ||
5540 | turtle = SCM_CDR (turtle); | |
5541 | ASSERT_SYNTAX (!SCM_EQ_P (rabbit, turtle), | |
5542 | s_bad_expression, rabbit); | |
5543 | } | |
5544 | } | |
5545 | ||
5546 | /* We have to recurse into copy_tree again for the last cdr, in | |
5547 | * order to handle the situation that it holds a vector. */ | |
5548 | new_hare.obj = rabbit; | |
5549 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5550 | SCM_SETCDR (tail, copy); | |
5551 | ||
5552 | return result; | |
5553 | } | |
5554 | } | |
5555 | } | |
5556 | ||
a1ec6916 | 5557 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5558 | (SCM obj), |
b380b885 | 5559 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
bfefbf18 | 5560 | "the new data structure. @code{copy-tree} recurses down the\n" |
b380b885 MD |
5561 | "contents of both pairs and vectors (since both cons cells and vector\n" |
5562 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5563 | "any other object.") | |
1bbd0b84 | 5564 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd | 5565 | { |
62360b89 DH |
5566 | /* Prepare the trace along the stack. */ |
5567 | struct t_trace trace; | |
5568 | trace.obj = obj; | |
5569 | ||
5570 | /* In function copy_tree, if the tortoise makes its step, it will do this | |
5571 | * before the hare has the chance to move. Thus, we have to make sure that | |
5572 | * the very first step of the tortoise will not happen after the hare has | |
5573 | * really made two steps. This is achieved by passing '2' as the initial | |
5574 | * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare | |
5575 | * a bigger advantage may improve performance slightly. */ | |
5576 | return copy_tree (&trace, &trace, 2); | |
0f2d19dd | 5577 | } |
1bbd0b84 | 5578 | #undef FUNC_NAME |
0f2d19dd | 5579 | |
1cc91f1b | 5580 | |
4163eb72 MV |
5581 | /* We have three levels of EVAL here: |
5582 | ||
5583 | - scm_i_eval (exp, env) | |
5584 | ||
5585 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5586 | structure as used by the actual tree code evaluator. When ENV is | |
5587 | a top-level environment, then changes to the current module are | |
a513ead3 | 5588 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5589 | the current module. |
5590 | ||
5591 | - scm_primitive_eval (exp) | |
5592 | ||
5593 | evaluates EXP in the top-level environment as determined by the | |
5594 | current module. This is done by constructing a suitable | |
5595 | environment and calling scm_i_eval. Thus, changes to the | |
5596 | top-level module are tracked normally. | |
5597 | ||
5598 | - scm_eval (exp, mod) | |
5599 | ||
a513ead3 | 5600 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
5601 | setting the current module to MOD, invoking scm_primitive_eval on |
5602 | EXP, and then restoring the current module to the value it had | |
5603 | previously. That is, while EXP is evaluated, changes to the | |
5604 | current module are tracked, but these changes do not persist when | |
5605 | scm_eval returns. | |
5606 | ||
5607 | For each level of evals, there are two variants, distinguished by a | |
5608 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5609 | variant can destructively modify EXP into something completely | |
5610 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5611 | _x variants should not ever be used again for anything. So when in | |
5612 | doubt, use the ordinary variant. | |
5613 | ||
5614 | */ | |
5615 | ||
0f2d19dd | 5616 | SCM |
68d8be66 | 5617 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5618 | { |
434f2f7a DH |
5619 | if (SCM_SYMBOLP (exp)) |
5620 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); | |
5621 | else | |
5622 | return SCM_XEVAL (exp, env); | |
0f2d19dd JB |
5623 | } |
5624 | ||
68d8be66 MD |
5625 | SCM |
5626 | scm_i_eval (SCM exp, SCM env) | |
5627 | { | |
26fb6390 | 5628 | exp = scm_copy_tree (exp); |
434f2f7a DH |
5629 | if (SCM_SYMBOLP (exp)) |
5630 | return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1); | |
5631 | else | |
5632 | return SCM_XEVAL (exp, env); | |
68d8be66 MD |
5633 | } |
5634 | ||
5635 | SCM | |
4163eb72 | 5636 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5637 | { |
a513ead3 | 5638 | SCM env; |
bcdab802 | 5639 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5640 | if (SCM_NIMP (transformer)) |
fdc28395 | 5641 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5642 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5643 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5644 | } |
5645 | ||
4163eb72 MV |
5646 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5647 | (SCM exp), | |
2069af38 | 5648 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5649 | "the current module.") |
5650 | #define FUNC_NAME s_scm_primitive_eval | |
5651 | { | |
a513ead3 | 5652 | SCM env; |
bcdab802 | 5653 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5654 | if (SCM_NIMP (transformer)) |
fdc28395 | 5655 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5656 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5657 | return scm_i_eval (exp, env); |
5658 | } | |
5659 | #undef FUNC_NAME | |
5660 | ||
6bff1368 | 5661 | |
68d8be66 MD |
5662 | /* Eval does not take the second arg optionally. This is intentional |
5663 | * in order to be R5RS compatible, and to prepare for the new module | |
5664 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5665 | * environment explicit. */ |
549e6ec6 | 5666 | |
09074dbf DH |
5667 | static void |
5668 | change_environment (void *data) | |
5669 | { | |
5670 | SCM pair = SCM_PACK (data); | |
5671 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 5672 | SCM old_module = scm_current_module (); |
09074dbf | 5673 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 5674 | scm_set_current_module (new_module); |
09074dbf DH |
5675 | } |
5676 | ||
09074dbf DH |
5677 | static void |
5678 | restore_environment (void *data) | |
5679 | { | |
5680 | SCM pair = SCM_PACK (data); | |
5681 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 5682 | SCM new_module = scm_current_module (); |
2e9c835d | 5683 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 5684 | scm_set_current_module (old_module); |
09074dbf DH |
5685 | } |
5686 | ||
4163eb72 MV |
5687 | static SCM |
5688 | inner_eval_x (void *data) | |
5689 | { | |
5690 | return scm_primitive_eval_x (SCM_PACK(data)); | |
5691 | } | |
5692 | ||
5693 | SCM | |
5694 | scm_eval_x (SCM exp, SCM module) | |
5695 | #define FUNC_NAME "eval!" | |
5696 | { | |
5697 | SCM_VALIDATE_MODULE (2, module); | |
5698 | ||
5699 | return scm_internal_dynamic_wind | |
5700 | (change_environment, inner_eval_x, restore_environment, | |
5701 | (void *) SCM_UNPACK (exp), | |
5702 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
5703 | } | |
5704 | #undef FUNC_NAME | |
5705 | ||
5706 | static SCM | |
5707 | inner_eval (void *data) | |
5708 | { | |
5709 | return scm_primitive_eval (SCM_PACK(data)); | |
5710 | } | |
09074dbf | 5711 | |
68d8be66 | 5712 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
5713 | (SCM exp, SCM module), |
5714 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
5715 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 5716 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
5717 | "@var{module} is made the current module. The current module\n" |
5718 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 5719 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5720 | { |
4163eb72 | 5721 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
5722 | |
5723 | return scm_internal_dynamic_wind | |
5724 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
5725 | (void *) SCM_UNPACK (exp), |
5726 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 5727 | } |
1bbd0b84 | 5728 | #undef FUNC_NAME |
0f2d19dd | 5729 | |
6dbd0af5 | 5730 | |
434f2f7a | 5731 | /* At this point, deval and scm_dapply are generated. |
6dbd0af5 MD |
5732 | */ |
5733 | ||
a44a9715 DH |
5734 | #define DEVAL |
5735 | #include "eval.c" | |
0f2d19dd | 5736 | |
1cc91f1b | 5737 | |
434f2f7a DH |
5738 | #if (SCM_ENABLE_DEPRECATED == 1) |
5739 | ||
5740 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5741 | SCM scm_ceval (SCM x, SCM env) | |
5742 | { | |
5743 | if (SCM_CONSP (x)) | |
5744 | return ceval (x, env); | |
5745 | else if (SCM_SYMBOLP (x)) | |
5746 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); | |
5747 | else | |
5748 | return SCM_XEVAL (x, env); | |
5749 | } | |
5750 | ||
5751 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5752 | SCM scm_deval (SCM x, SCM env) | |
5753 | { | |
5754 | if (SCM_CONSP (x)) | |
5755 | return deval (x, env); | |
5756 | else if (SCM_SYMBOLP (x)) | |
5757 | return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1); | |
5758 | else | |
5759 | return SCM_XEVAL (x, env); | |
5760 | } | |
5761 | ||
5762 | static SCM | |
5763 | dispatching_eval (SCM x, SCM env) | |
5764 | { | |
5765 | if (scm_debug_mode_p) | |
5766 | return scm_deval (x, env); | |
5767 | else | |
5768 | return scm_ceval (x, env); | |
5769 | } | |
5770 | ||
5771 | /* Deprecated in guile 1.7.0 on 2004-03-29. */ | |
5772 | SCM (*scm_ceval_ptr) (SCM x, SCM env) = dispatching_eval; | |
5773 | ||
5774 | #endif | |
5775 | ||
5776 | ||
0f2d19dd JB |
5777 | void |
5778 | scm_init_eval () | |
0f2d19dd | 5779 | { |
33b97402 MD |
5780 | scm_init_opts (scm_evaluator_traps, |
5781 | scm_evaluator_trap_table, | |
5782 | SCM_N_EVALUATOR_TRAPS); | |
5783 | scm_init_opts (scm_eval_options_interface, | |
5784 | scm_eval_opts, | |
5785 | SCM_N_EVAL_OPTIONS); | |
5786 | ||
f99c9c28 MD |
5787 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
5788 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 5789 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 5790 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 5791 | |
a44a9715 DH |
5792 | undefineds = scm_list_1 (SCM_UNDEFINED); |
5793 | SCM_SETCDR (undefineds, undefineds); | |
5794 | scm_permanent_object (undefineds); | |
7c33806a | 5795 | |
a44a9715 | 5796 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 5797 | |
a44a9715 DH |
5798 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
5799 | scm_permanent_object (f_apply); | |
86d31dfe | 5800 | |
a0599745 | 5801 | #include "libguile/eval.x" |
60a49842 | 5802 | |
25eaf21a | 5803 | scm_add_feature ("delay"); |
0f2d19dd | 5804 | } |
0f2d19dd | 5805 | |
6dbd0af5 | 5806 | #endif /* !DEVAL */ |
89e00824 ML |
5807 | |
5808 | /* | |
5809 | Local Variables: | |
5810 | c-file-style: "gnu" | |
5811 | End: | |
5812 | */ |