Commit | Line | Data |
---|---|---|
fc22b297 | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003, 2004 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
73be1d9e MV |
8 | * This library is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
1bbd0b84 | 17 | |
0f2d19dd JB |
18 | \f |
19 | ||
6dbd0af5 MD |
20 | /* This file is read twice in order to produce debugging versions of |
21 | * scm_ceval and scm_apply. These functions, scm_deval and | |
22 | * scm_dapply, are produced when we define the preprocessor macro | |
23 | * DEVAL. The file is divided into sections which are treated | |
24 | * differently with respect to DEVAL. The heads of these sections are | |
25 | * marked with the string "SECTION:". | |
26 | */ | |
27 | ||
6dbd0af5 | 28 | /* SECTION: This code is compiled once. |
0f2d19dd JB |
29 | */ |
30 | ||
3d05f2e0 RB |
31 | #if HAVE_CONFIG_H |
32 | # include <config.h> | |
33 | #endif | |
0f2d19dd | 34 | |
3d05f2e0 RB |
35 | #include "libguile/__scm.h" |
36 | ||
37 | #ifndef DEVAL | |
d16332b3 | 38 | |
48b96f4b JB |
39 | /* AIX requires this to be the first thing in the file. The #pragma |
40 | directive is indented so pre-ANSI compilers will ignore it, rather | |
41 | than choke on it. */ | |
5862b540 | 42 | #ifndef __GNUC__ |
48b96f4b JB |
43 | # if HAVE_ALLOCA_H |
44 | # include <alloca.h> | |
45 | # else | |
46 | # ifdef _AIX | |
ac13d9d2 | 47 | # pragma alloca |
48b96f4b JB |
48 | # else |
49 | # ifndef alloca /* predefined by HP cc +Olibcalls */ | |
50 | char *alloca (); | |
51 | # endif | |
52 | # endif | |
53 | # endif | |
54 | #endif | |
55 | ||
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" |
21628685 | 76 | #include "libguile/procprop.h" |
a0599745 | 77 | #include "libguile/root.h" |
21628685 DH |
78 | #include "libguile/smob.h" |
79 | #include "libguile/srcprop.h" | |
80 | #include "libguile/stackchk.h" | |
81 | #include "libguile/strings.h" | |
82 | #include "libguile/throw.h" | |
83 | #include "libguile/validate.h" | |
a513ead3 | 84 | #include "libguile/values.h" |
21628685 | 85 | #include "libguile/vectors.h" |
a0599745 | 86 | |
a0599745 | 87 | #include "libguile/eval.h" |
89efbff4 | 88 | |
0f2d19dd JB |
89 | \f |
90 | ||
0f572ba7 DH |
91 | static SCM canonicalize_define (SCM expr); |
92 | ||
93 | \f | |
94 | ||
e6729603 DH |
95 | /* {Syntax Errors} |
96 | * | |
97 | * This section defines the message strings for the syntax errors that can be | |
98 | * detected during memoization and the functions and macros that shall be | |
99 | * called by the memoizer code to signal syntax errors. */ | |
100 | ||
101 | ||
102 | /* Syntax errors that can be detected during memoization: */ | |
103 | ||
104 | /* Circular or improper lists do not form valid scheme expressions. If a | |
105 | * circular list or an improper list is detected in a place where a scheme | |
106 | * expression is expected, a 'Bad expression' error is signalled. */ | |
107 | static const char s_bad_expression[] = "Bad expression"; | |
108 | ||
89bff2fc DH |
109 | /* If a form is detected that holds a different number of expressions than are |
110 | * required in that context, a 'Missing or extra expression' error is | |
111 | * signalled. */ | |
112 | static const char s_expression[] = "Missing or extra expression in"; | |
113 | ||
cc56ba80 | 114 | /* If a form is detected that holds less expressions than are required in that |
8ae95199 | 115 | * context, a 'Missing expression' error is signalled. */ |
cc56ba80 DH |
116 | static const char s_missing_expression[] = "Missing expression in"; |
117 | ||
609a8b86 | 118 | /* If a form is detected that holds more expressions than are allowed in that |
8ae95199 | 119 | * context, an 'Extra expression' error is signalled. */ |
609a8b86 DH |
120 | static const char s_extra_expression[] = "Extra expression in"; |
121 | ||
89bff2fc DH |
122 | /* The empty combination '()' is not allowed as an expression in scheme. If |
123 | * it is detected in a place where an expression is expected, an 'Illegal | |
124 | * empty combination' error is signalled. Note: If you encounter this error | |
125 | * message, it is very likely that you intended to denote the empty list. To | |
126 | * do so, you need to quote the empty list like (quote ()) or '(). */ | |
127 | static const char s_empty_combination[] = "Illegal empty combination"; | |
128 | ||
c86c440b DH |
129 | /* A body may hold an arbitrary number of internal defines, followed by a |
130 | * non-empty sequence of expressions. If a body with an empty sequence of | |
131 | * expressions is detected, a 'Missing body expression' error is signalled. | |
132 | */ | |
133 | static const char s_missing_body_expression[] = "Missing body expression in"; | |
134 | ||
135 | /* A body may hold an arbitrary number of internal defines, followed by a | |
136 | * non-empty sequence of expressions. Each the definitions and the | |
137 | * expressions may be grouped arbitraryly with begin, but it is not allowed to | |
138 | * mix definitions and expressions. If a define form in a body mixes | |
139 | * definitions and expressions, a 'Mixed definitions and expressions' error is | |
6bff1368 | 140 | * signalled. */ |
c86c440b | 141 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; |
6bff1368 DH |
142 | /* Definitions are only allowed on the top level and at the start of a body. |
143 | * If a definition is detected anywhere else, a 'Bad define placement' error | |
144 | * is signalled. */ | |
145 | static const char s_bad_define[] = "Bad define placement"; | |
c86c440b | 146 | |
2a6f7afe DH |
147 | /* Case or cond expressions must have at least one clause. If a case or cond |
148 | * expression without any clauses is detected, a 'Missing clauses' error is | |
149 | * signalled. */ | |
150 | static const char s_missing_clauses[] = "Missing clauses"; | |
151 | ||
609a8b86 DH |
152 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
153 | * last clause. If after the 'else' case clause further clauses are detected, | |
154 | * a 'Misplaced else clause' error is signalled. */ | |
155 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
156 | ||
2a6f7afe DH |
157 | /* If a case clause is detected that is not in the format |
158 | * (<label(s)> <expression1> <expression2> ...) | |
159 | * a 'Bad case clause' error is signalled. */ | |
160 | static const char s_bad_case_clause[] = "Bad case clause"; | |
161 | ||
2a6f7afe DH |
162 | /* If a case clause is detected where the <label(s)> element is neither a |
163 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
164 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
165 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
166 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
167 | * local or global environment, it is not considered a syntactic keyword, but | |
168 | * will be treated as any other variable. */ | |
169 | static const char s_bad_case_labels[] = "Bad case labels"; | |
170 | ||
171 | /* In a case statement all labels have to be distinct. If in a case statement | |
172 | * a label occurs more than once, a 'Duplicate case label' error is | |
173 | * signalled. */ | |
174 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
175 | ||
609a8b86 DH |
176 | /* If a cond clause is detected that is not in one of the formats |
177 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
178 | * a 'Bad cond clause' error is signalled. */ | |
179 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
180 | ||
181 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
182 | * not hold a recipient element for the test result, a 'Missing recipient' | |
183 | * error is signalled. */ | |
184 | static const char s_missing_recipient[] = "Missing recipient in"; | |
185 | ||
cc56ba80 DH |
186 | /* If in a position where a variable name is required some other object is |
187 | * detected, a 'Bad variable' error is signalled. */ | |
188 | static const char s_bad_variable[] = "Bad variable"; | |
189 | ||
a954ce1d DH |
190 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
191 | * possibly empty list. If any other object is detected in a place where a | |
192 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
193 | static const char s_bad_bindings[] = "Bad bindings"; | |
194 | ||
195 | /* Depending on the syntactic context, a binding has to be in the format | |
196 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
197 | * If anything else is detected in a place where a binding was expected, a | |
198 | * 'Bad binding' error is signalled. */ | |
199 | static const char s_bad_binding[] = "Bad binding"; | |
200 | ||
4610b011 DH |
201 | /* Some syntactic forms don't allow variable names to appear more than once in |
202 | * a list of bindings. If such a situation is nevertheless detected, a | |
203 | * 'Duplicate binding' error is signalled. */ | |
204 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
205 | ||
a954ce1d DH |
206 | /* If the exit form of a 'do' expression is not in the format |
207 | * (<test> <expression> ...) | |
208 | * a 'Bad exit clause' error is signalled. */ | |
209 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
210 | ||
03a3e941 DH |
211 | /* The formal function arguments of a lambda expression have to be either a |
212 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
213 | * error is signalled. */ | |
214 | static const char s_bad_formals[] = "Bad formals"; | |
215 | ||
216 | /* If in a lambda expression something else than a symbol is detected at a | |
217 | * place where a formal function argument is required, a 'Bad formal' error is | |
218 | * signalled. */ | |
219 | static const char s_bad_formal[] = "Bad formal"; | |
220 | ||
221 | /* If in the arguments list of a lambda expression an argument name occurs | |
222 | * more than once, a 'Duplicate formal' error is signalled. */ | |
223 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
224 | ||
6f81708a DH |
225 | /* If the evaluation of an unquote-splicing expression gives something else |
226 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
227 | * signalled. */ | |
228 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
229 | ||
9a848baf DH |
230 | /* If something else than an exact integer is detected as the argument for |
231 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
232 | static const char s_bad_slot_number[] = "Bad slot number"; | |
233 | ||
e6729603 DH |
234 | |
235 | /* Signal a syntax error. We distinguish between the form that caused the | |
236 | * error and the enclosing expression. The error message will print out as | |
237 | * shown in the following pattern. The file name and line number are only | |
238 | * given when they can be determined from the erroneous form or from the | |
239 | * enclosing expression. | |
240 | * | |
241 | * <filename>: In procedure memoization: | |
242 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
243 | ||
244 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
245 | ||
246 | /* The prototype is needed to indicate that the function does not return. */ | |
247 | static void | |
248 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
249 | ||
250 | static void | |
251 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
252 | { | |
253 | const SCM msg_string = scm_makfrom0str (msg); | |
254 | SCM filename = SCM_BOOL_F; | |
255 | SCM linenr = SCM_BOOL_F; | |
256 | const char *format; | |
257 | SCM args; | |
258 | ||
259 | if (SCM_CONSP (form)) | |
260 | { | |
261 | filename = scm_source_property (form, scm_sym_filename); | |
262 | linenr = scm_source_property (form, scm_sym_line); | |
263 | } | |
264 | ||
265 | if (SCM_FALSEP (filename) && SCM_FALSEP (linenr) && SCM_CONSP (expr)) | |
266 | { | |
267 | filename = scm_source_property (expr, scm_sym_filename); | |
268 | linenr = scm_source_property (expr, scm_sym_line); | |
269 | } | |
270 | ||
271 | if (!SCM_UNBNDP (expr)) | |
272 | { | |
273 | if (!SCM_FALSEP (filename)) | |
274 | { | |
275 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
276 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
277 | } | |
278 | else if (!SCM_FALSEP (linenr)) | |
279 | { | |
280 | format = "In line ~S: ~A ~S in expression ~S."; | |
281 | args = scm_list_4 (linenr, msg_string, form, expr); | |
282 | } | |
283 | else | |
284 | { | |
285 | format = "~A ~S in expression ~S."; | |
286 | args = scm_list_3 (msg_string, form, expr); | |
287 | } | |
288 | } | |
289 | else | |
290 | { | |
291 | if (!SCM_FALSEP (filename)) | |
292 | { | |
293 | format = "In file ~S, line ~S: ~A ~S."; | |
294 | args = scm_list_4 (filename, linenr, msg_string, form); | |
295 | } | |
296 | else if (!SCM_FALSEP (linenr)) | |
297 | { | |
298 | format = "In line ~S: ~A ~S."; | |
299 | args = scm_list_3 (linenr, msg_string, form); | |
300 | } | |
301 | else | |
302 | { | |
303 | format = "~A ~S."; | |
304 | args = scm_list_2 (msg_string, form); | |
305 | } | |
306 | } | |
307 | ||
308 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
309 | } | |
310 | ||
311 | ||
312 | /* Shortcut macros to simplify syntax error handling. */ | |
313 | #define ASSERT_SYNTAX(cond, message, form) \ | |
314 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
315 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
316 | { if (!(cond)) syntax_error (message, form, expr); } | |
317 | ||
318 | \f | |
319 | ||
d0624e39 DH |
320 | /* {Ilocs} |
321 | * | |
322 | * Ilocs are memoized references to variables in local environment frames. | |
323 | * They are represented as three values: The relative offset of the | |
324 | * environment frame, the number of the binding within that frame, and a | |
325 | * boolean value indicating whether the binding is the last binding in the | |
326 | * frame. | |
327 | */ | |
328 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) | |
329 | #define SCM_IDINC (0x00100000L) | |
330 | #define SCM_IDSTMSK (-SCM_IDINC) | |
331 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ | |
332 | SCM_PACK ( \ | |
333 | ((frame_nr) << 8) \ | |
334 | + ((binding_nr) << 20) \ | |
335 | + ((last_p) ? SCM_ICDR : 0) \ | |
336 | + scm_tc8_iloc ) | |
337 | ||
338 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) | |
339 | ||
340 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
341 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, | |
342 | (SCM frame, SCM binding, SCM cdrp), | |
343 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
344 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
345 | #define FUNC_NAME s_scm_dbg_make_iloc | |
346 | { | |
347 | SCM_VALIDATE_INUM (1, frame); | |
348 | SCM_VALIDATE_INUM (2, binding); | |
349 | return SCM_MAKE_ILOC (SCM_INUM (frame), | |
350 | SCM_INUM (binding), | |
351 | !SCM_FALSEP (cdrp)); | |
352 | } | |
353 | #undef FUNC_NAME | |
354 | ||
355 | SCM scm_dbg_iloc_p (SCM obj); | |
356 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, | |
357 | (SCM obj), | |
358 | "Return @code{#t} if @var{obj} is an iloc.") | |
359 | #define FUNC_NAME s_scm_dbg_iloc_p | |
360 | { | |
361 | return SCM_BOOL (SCM_ILOCP (obj)); | |
362 | } | |
363 | #undef FUNC_NAME | |
364 | ||
365 | #endif | |
366 | ||
367 | \f | |
368 | ||
6f81708a DH |
369 | /* The function lookup_symbol is used during memoization: Lookup the symbol |
370 | * in the environment. If there is no binding for the symbol, SCM_UNDEFINED | |
371 | * is returned. If the symbol is a syntactic keyword, the macro object to | |
372 | * which the symbol is bound is returned. If the symbol is a global variable, | |
373 | * the variable object to which the symbol is bound is returned. Finally, if | |
374 | * the symbol is a local variable the corresponding iloc object is returned. | |
375 | */ | |
376 | ||
377 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
378 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
379 | * is unbound, it returns a macro object if the symbol is a syntactic keyword | |
380 | * and it returns a variable object if the symbol is a global variable. */ | |
381 | static SCM | |
382 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
383 | { | |
384 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
385 | if (SCM_FALSEP (variable)) | |
386 | { | |
387 | return SCM_UNDEFINED; | |
388 | } | |
389 | else | |
390 | { | |
391 | const SCM value = SCM_VARIABLE_REF (variable); | |
392 | if (SCM_MACROP (value)) | |
393 | return value; | |
394 | else | |
395 | return variable; | |
396 | } | |
397 | } | |
398 | ||
399 | static SCM | |
400 | lookup_symbol (const SCM symbol, const SCM env) | |
401 | { | |
402 | SCM frame_idx; | |
403 | unsigned int frame_nr; | |
404 | ||
405 | for (frame_idx = env, frame_nr = 0; | |
406 | !SCM_NULLP (frame_idx); | |
407 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) | |
408 | { | |
409 | const SCM frame = SCM_CAR (frame_idx); | |
410 | if (SCM_CONSP (frame)) | |
411 | { | |
412 | /* frame holds a local environment frame */ | |
413 | SCM symbol_idx; | |
414 | unsigned int symbol_nr; | |
415 | ||
416 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
417 | SCM_CONSP (symbol_idx); | |
418 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) | |
419 | { | |
420 | if (SCM_EQ_P (SCM_CAR (symbol_idx), symbol)) | |
421 | /* found the symbol, therefore return the iloc */ | |
422 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
423 | } | |
424 | if (SCM_EQ_P (symbol_idx, symbol)) | |
425 | /* found the symbol as the last element of the current frame */ | |
426 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
427 | } | |
428 | else | |
429 | { | |
430 | /* no more local environment frames */ | |
431 | return lookup_global_symbol (symbol, frame); | |
432 | } | |
433 | } | |
434 | ||
435 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
436 | } | |
437 | ||
438 | ||
439 | /* Return true if the symbol is - from the point of view of a macro | |
440 | * transformer - a literal in the sense specified in chapter "pattern | |
441 | * language" of R5RS. In the code below, however, we don't match the | |
442 | * definition of R5RS exactly: It returns true if the identifier has no | |
443 | * binding or if it is a syntactic keyword. */ | |
444 | static int | |
445 | literal_p (const SCM symbol, const SCM env) | |
446 | { | |
447 | const SCM value = lookup_symbol (symbol, env); | |
448 | if (SCM_UNBNDP (value) || SCM_MACROP (value)) | |
449 | return 1; | |
450 | else | |
451 | return 0; | |
452 | } | |
17fa3fcf DH |
453 | |
454 | \f | |
455 | ||
12841895 DH |
456 | /* Lookup a given local variable in an environment. The local variable is |
457 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
458 | * indicates the relative number of the environment frame (counting upwards | |
459 | * from the innermost environment frame), binding indicates the number of the | |
460 | * binding within the frame, and last? (which is extracted from the iloc using | |
461 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
462 | * very end of the improper list of bindings. */ | |
0f2d19dd | 463 | SCM * |
6e8d25a6 | 464 | scm_ilookup (SCM iloc, SCM env) |
0f2d19dd | 465 | { |
12841895 DH |
466 | unsigned int frame_nr = SCM_IFRAME (iloc); |
467 | unsigned int binding_nr = SCM_IDIST (iloc); | |
468 | SCM frames = env; | |
469 | SCM bindings; | |
470 | ||
471 | for (; 0 != frame_nr; --frame_nr) | |
472 | frames = SCM_CDR (frames); | |
473 | ||
474 | bindings = SCM_CAR (frames); | |
475 | for (; 0 != binding_nr; --binding_nr) | |
476 | bindings = SCM_CDR (bindings); | |
477 | ||
0f2d19dd | 478 | if (SCM_ICDRP (iloc)) |
12841895 DH |
479 | return SCM_CDRLOC (bindings); |
480 | return SCM_CARLOC (SCM_CDR (bindings)); | |
0f2d19dd | 481 | } |
0f2d19dd | 482 | |
12841895 | 483 | |
89bff2fc DH |
484 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); |
485 | ||
486 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
487 | static void | |
488 | error_unbound_variable (SCM symbol) | |
489 | { | |
490 | scm_error (scm_unbound_variable_key, NULL, | |
491 | "Unbound variable: ~S", | |
492 | scm_list_1 (symbol), SCM_BOOL_F); | |
493 | } | |
494 | ||
495 | ||
f8769b1d MV |
496 | /* The Lookup Car Race |
497 | - by Eva Luator | |
498 | ||
499 | Memoization of variables and special forms is done while executing | |
500 | the code for the first time. As long as there is only one thread | |
501 | everything is fine, but as soon as two threads execute the same | |
502 | code concurrently `for the first time' they can come into conflict. | |
503 | ||
504 | This memoization includes rewriting variable references into more | |
505 | efficient forms and expanding macros. Furthermore, macro expansion | |
506 | includes `compiling' special forms like `let', `cond', etc. into | |
507 | tree-code instructions. | |
508 | ||
509 | There shouldn't normally be a problem with memoizing local and | |
904a077d | 510 | global variable references (into ilocs and variables), because all |
f8769b1d MV |
511 | threads will mutate the code in *exactly* the same way and (if I |
512 | read the C code correctly) it is not possible to observe a half-way | |
513 | mutated cons cell. The lookup procedure can handle this | |
514 | transparently without any critical sections. | |
515 | ||
516 | It is different with macro expansion, because macro expansion | |
517 | happens outside of the lookup procedure and can't be | |
904a077d MV |
518 | undone. Therefore the lookup procedure can't cope with it. It has |
519 | to indicate failure when it detects a lost race and hope that the | |
520 | caller can handle it. Luckily, it turns out that this is the case. | |
f8769b1d | 521 | |
904a077d | 522 | An example to illustrate this: Suppose that the following form will |
f8769b1d MV |
523 | be memoized concurrently by two threads |
524 | ||
525 | (let ((x 12)) x) | |
526 | ||
527 | Let's first examine the lookup of X in the body. The first thread | |
528 | decides that it has to find the symbol "x" in the environment and | |
529 | starts to scan it. Then the other thread takes over and actually | |
530 | overtakes the first. It looks up "x" and substitutes an | |
531 | appropriate iloc for it. Now the first thread continues and | |
532 | completes its lookup. It comes to exactly the same conclusions as | |
533 | the second one and could - without much ado - just overwrite the | |
534 | iloc with the same iloc. | |
535 | ||
536 | But let's see what will happen when the race occurs while looking | |
537 | up the symbol "let" at the start of the form. It could happen that | |
538 | the second thread interrupts the lookup of the first thread and not | |
904a077d MV |
539 | only substitutes a variable for it but goes right ahead and |
540 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
541 | the first thread completes its lookup, it would replace the #@let* | |
542 | with a variable containing the "let" binding, effectively reverting | |
543 | the form to (let (x 12) x). This is wrong. It has to detect that | |
544 | it has lost the race and the evaluator has to reconsider the | |
545 | changed form completely. | |
f8769b1d MV |
546 | |
547 | This race condition could be resolved with some kind of traffic | |
548 | light (like mutexes) around scm_lookupcar, but I think that it is | |
549 | best to avoid them in this case. They would serialize memoization | |
550 | completely and because lookup involves calling arbitrary Scheme | |
551 | code (via the lookup-thunk), threads could be blocked for an | |
552 | arbitrary amount of time or even deadlock. But with the current | |
553 | solution a lot of unnecessary work is potentially done. */ | |
554 | ||
9aa82b39 | 555 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to |
f8769b1d MV |
556 | return NULL to indicate a failed lookup due to some race conditions |
557 | between threads. This only happens when VLOC is the first cell of | |
558 | a special form that will eventually be memoized (like `let', etc.) | |
559 | In that case the whole lookup is bogus and the caller has to | |
560 | reconsider the complete special form. | |
561 | ||
562 | SCM_LOOKUPCAR is still there, of course. It just calls | |
de513fa0 | 563 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR |
f8769b1d MV |
564 | should only be called when it is known that VLOC is not the first |
565 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
26d5b9b4 MD |
566 | for NULL. I think I've found the only places where this |
567 | applies. */ | |
f8769b1d | 568 | |
8ecf1f13 | 569 | static SCM * |
26d5b9b4 | 570 | scm_lookupcar1 (SCM vloc, SCM genv, int check) |
0f2d19dd JB |
571 | { |
572 | SCM env = genv; | |
e3173f93 | 573 | register SCM *al, fl, var = SCM_CAR (vloc); |
0f2d19dd | 574 | register SCM iloc = SCM_ILOC00; |
0f2d19dd JB |
575 | for (; SCM_NIMP (env); env = SCM_CDR (env)) |
576 | { | |
790071cd | 577 | if (!SCM_CONSP (SCM_CAR (env))) |
0f2d19dd | 578 | break; |
a23afe53 | 579 | al = SCM_CARLOC (env); |
0f2d19dd JB |
580 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) |
581 | { | |
01f11e02 | 582 | if (!SCM_CONSP (fl)) |
33b97402 | 583 | { |
cf498326 | 584 | if (SCM_EQ_P (fl, var)) |
0f2d19dd | 585 | { |
cf498326 | 586 | if (! SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 587 | goto race; |
3201d763 | 588 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); |
a23afe53 | 589 | return SCM_CDRLOC (*al); |
0f2d19dd | 590 | } |
33b97402 MD |
591 | else |
592 | break; | |
593 | } | |
a23afe53 | 594 | al = SCM_CDRLOC (*al); |
cf498326 | 595 | if (SCM_EQ_P (SCM_CAR (fl), var)) |
0f2d19dd | 596 | { |
0f2d19dd JB |
597 | if (SCM_UNBNDP (SCM_CAR (*al))) |
598 | { | |
599 | env = SCM_EOL; | |
600 | goto errout; | |
601 | } | |
c6772927 | 602 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 603 | goto race; |
a23afe53 | 604 | SCM_SETCAR (vloc, iloc); |
a23afe53 | 605 | return SCM_CARLOC (*al); |
0f2d19dd | 606 | } |
3201d763 | 607 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); |
0f2d19dd | 608 | } |
3201d763 | 609 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); |
0f2d19dd JB |
610 | } |
611 | { | |
86d31dfe | 612 | SCM top_thunk, real_var; |
790071cd | 613 | if (SCM_NIMP (env)) |
0f2d19dd | 614 | { |
86d31dfe MV |
615 | top_thunk = SCM_CAR (env); /* env now refers to a |
616 | top level env thunk */ | |
0f2d19dd JB |
617 | env = SCM_CDR (env); |
618 | } | |
619 | else | |
620 | top_thunk = SCM_BOOL_F; | |
86d31dfe MV |
621 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); |
622 | if (SCM_FALSEP (real_var)) | |
0f2d19dd | 623 | goto errout; |
86d31dfe | 624 | |
01f11e02 | 625 | if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
86d31dfe MV |
626 | { |
627 | errout: | |
86d31dfe MV |
628 | if (check) |
629 | { | |
630 | if (SCM_NULLP (env)) | |
89bff2fc | 631 | error_unbound_variable (var); |
86d31dfe MV |
632 | else |
633 | scm_misc_error (NULL, "Damaged environment: ~S", | |
8ea46249 | 634 | scm_list_1 (var)); |
86d31dfe MV |
635 | } |
636 | else | |
637 | { | |
638 | /* A variable could not be found, but we shall | |
639 | not throw an error. */ | |
640 | static SCM undef_object = SCM_UNDEFINED; | |
641 | return &undef_object; | |
642 | } | |
09e4d064 | 643 | } |
86d31dfe | 644 | |
c6772927 | 645 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
86d31dfe MV |
646 | { |
647 | /* Some other thread has changed the very cell we are working | |
648 | on. In effect, it must have done our job or messed it up | |
649 | completely. */ | |
650 | race: | |
651 | var = SCM_CAR (vloc); | |
d22a0ea1 MV |
652 | if (SCM_VARIABLEP (var)) |
653 | return SCM_VARIABLE_LOC (var); | |
86d31dfe MV |
654 | if (SCM_ITAG7 (var) == SCM_ITAG7 (SCM_ILOC00)) |
655 | return scm_ilookup (var, genv); | |
904a077d | 656 | /* We can't cope with anything else than variables and ilocs. When |
86d31dfe MV |
657 | a special form has been memoized (i.e. `let' into `#@let') we |
658 | return NULL and expect the calling function to do the right | |
659 | thing. For the evaluator, this means going back and redoing | |
660 | the dispatch on the car of the form. */ | |
661 | return NULL; | |
662 | } | |
f8769b1d | 663 | |
d22a0ea1 | 664 | SCM_SETCAR (vloc, real_var); |
86d31dfe MV |
665 | return SCM_VARIABLE_LOC (real_var); |
666 | } | |
0f2d19dd JB |
667 | } |
668 | ||
f8769b1d | 669 | SCM * |
6e8d25a6 | 670 | scm_lookupcar (SCM vloc, SCM genv, int check) |
f8769b1d | 671 | { |
26d5b9b4 | 672 | SCM *loc = scm_lookupcar1 (vloc, genv, check); |
f8769b1d MV |
673 | if (loc == NULL) |
674 | abort (); | |
675 | return loc; | |
676 | } | |
f8769b1d | 677 | |
0f2d19dd | 678 | \f |
0f2d19dd | 679 | |
34adf7ea DH |
680 | /* Rewrite the body (which is given as the list of expressions forming the |
681 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
682 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
683 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
684 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 685 | * SCM_IM_LET, etc. |
34adf7ea DH |
686 | * |
687 | * It is assumed that the calling expression has already made sure that the | |
688 | * body is a proper list. */ | |
26d5b9b4 | 689 | static SCM |
430b8401 | 690 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 691 | { |
26d5b9b4 | 692 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
693 | if (SCM_ISYMP (SCM_CAR (exprs))) |
694 | return exprs; | |
695 | else | |
696 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
697 | } |
698 | ||
1cc91f1b | 699 | |
9d4bf6d3 MV |
700 | /* The function m_expand_body memoizes a proper list of expressions |
701 | * forming a body. This function takes care of dealing with internal | |
702 | * defines and transforming them into an equivalent letrec expression. | |
703 | * The list of expressions is rewritten in place. */ | |
910b5125 DH |
704 | |
705 | /* This is a helper function for m_expand_body. It helps to figure out whether | |
706 | * an expression denotes a syntactic keyword. */ | |
707 | static SCM | |
708 | try_macro_lookup (const SCM expr, const SCM env) | |
709 | { | |
710 | if (SCM_SYMBOLP (expr)) | |
711 | { | |
6f81708a | 712 | const SCM value = lookup_symbol (expr, env); |
910b5125 DH |
713 | return value; |
714 | } | |
715 | else | |
716 | { | |
717 | return SCM_UNDEFINED; | |
718 | } | |
719 | } | |
720 | ||
721 | /* This is a helper function for m_expand_body. It expands user macros, | |
722 | * because for the correct translation of a body we need to know whether they | |
723 | * expand to a definition. */ | |
724 | static SCM | |
725 | expand_user_macros (SCM expr, const SCM env) | |
726 | { | |
727 | while (SCM_CONSP (expr)) | |
728 | { | |
729 | const SCM car_expr = SCM_CAR (expr); | |
730 | const SCM new_car = expand_user_macros (car_expr, env); | |
731 | const SCM value = try_macro_lookup (new_car, env); | |
732 | ||
733 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
734 | { | |
735 | /* User macros transform code into code. */ | |
736 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
737 | /* We need to reiterate on the transformed code. */ | |
738 | } | |
739 | else | |
740 | { | |
741 | /* No user macro: return. */ | |
742 | SCM_SETCAR (expr, new_car); | |
743 | return expr; | |
744 | } | |
745 | } | |
746 | ||
747 | return expr; | |
748 | } | |
749 | ||
750 | /* This is a helper function for m_expand_body. It determines if a given form | |
751 | * represents an application of a given built-in macro. The built-in macro to | |
752 | * check for is identified by its syntactic keyword. The form is an | |
753 | * application of the given macro if looking up the car of the form in the | |
754 | * given environment actually returns the built-in macro. */ | |
755 | static int | |
756 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
757 | { | |
758 | if (SCM_CONSP (form)) | |
759 | { | |
760 | const SCM car_form = SCM_CAR (form); | |
761 | const SCM value = try_macro_lookup (car_form, env); | |
762 | if (SCM_BUILTIN_MACRO_P (value)) | |
763 | { | |
764 | const SCM macro_name = scm_macro_name (value); | |
765 | return SCM_EQ_P (macro_name, syntactic_keyword); | |
766 | } | |
767 | } | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
9d4bf6d3 | 772 | static void |
910b5125 DH |
773 | m_expand_body (const SCM forms, const SCM env) |
774 | { | |
775 | /* The first body form can be skipped since it is known to be the ISYM that | |
776 | * was prepended to the body by m_body. */ | |
777 | SCM cdr_forms = SCM_CDR (forms); | |
778 | SCM form_idx = cdr_forms; | |
779 | SCM definitions = SCM_EOL; | |
780 | SCM sequence = SCM_EOL; | |
781 | ||
782 | /* According to R5RS, the list of body forms consists of two parts: a number | |
783 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
784 | * expressions. Each the definitions and the expressions may be grouped | |
785 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
786 | * expressions. The task of the following loop therefore is to split the | |
787 | * list of body forms into the list of definitions and the sequence of | |
788 | * expressions. */ | |
789 | while (!SCM_NULLP (form_idx)) | |
790 | { | |
791 | const SCM form = SCM_CAR (form_idx); | |
792 | const SCM new_form = expand_user_macros (form, env); | |
793 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
794 | { | |
795 | definitions = scm_cons (new_form, definitions); | |
796 | form_idx = SCM_CDR (form_idx); | |
797 | } | |
798 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
799 | { | |
800 | /* We have encountered a group of forms. This has to be either a | |
801 | * (possibly empty) group of (possibly further grouped) definitions, | |
802 | * or a non-empty group of (possibly further grouped) | |
803 | * expressions. */ | |
804 | const SCM grouped_forms = SCM_CDR (new_form); | |
805 | unsigned int found_definition = 0; | |
806 | unsigned int found_expression = 0; | |
807 | SCM grouped_form_idx = grouped_forms; | |
808 | while (!found_expression && !SCM_NULLP (grouped_form_idx)) | |
809 | { | |
810 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
811 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
812 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
813 | { | |
814 | found_definition = 1; | |
815 | definitions = scm_cons (new_inner_form, definitions); | |
816 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
817 | } | |
818 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
819 | { | |
820 | const SCM inner_group = SCM_CDR (new_inner_form); | |
821 | grouped_form_idx | |
822 | = scm_append (scm_list_2 (inner_group, | |
823 | SCM_CDR (grouped_form_idx))); | |
824 | } | |
825 | else | |
826 | { | |
827 | /* The group marks the start of the expressions of the body. | |
828 | * We have to make sure that within the same group we have | |
829 | * not encountered a definition before. */ | |
830 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
831 | found_expression = 1; | |
832 | grouped_form_idx = SCM_EOL; | |
833 | } | |
834 | } | |
835 | ||
836 | /* We have finished processing the group. If we have not yet | |
837 | * encountered an expression we continue processing the forms of the | |
838 | * body to collect further definition forms. Otherwise, the group | |
839 | * marks the start of the sequence of expressions of the body. */ | |
840 | if (!found_expression) | |
841 | { | |
842 | form_idx = SCM_CDR (form_idx); | |
843 | } | |
844 | else | |
845 | { | |
846 | sequence = form_idx; | |
847 | form_idx = SCM_EOL; | |
848 | } | |
849 | } | |
850 | else | |
851 | { | |
852 | /* We have detected a form which is no definition. This marks the | |
853 | * start of the sequence of expressions of the body. */ | |
854 | sequence = form_idx; | |
855 | form_idx = SCM_EOL; | |
856 | } | |
857 | } | |
858 | ||
859 | /* FIXME: forms does not hold information about the file location. */ | |
860 | ASSERT_SYNTAX (SCM_CONSP (sequence), s_missing_body_expression, cdr_forms); | |
861 | ||
862 | if (!SCM_NULLP (definitions)) | |
863 | { | |
864 | SCM definition_idx; | |
865 | SCM letrec_tail; | |
866 | SCM letrec_expression; | |
867 | SCM new_letrec_expression; | |
910b5125 DH |
868 | |
869 | SCM bindings = SCM_EOL; | |
870 | for (definition_idx = definitions; | |
871 | !SCM_NULLP (definition_idx); | |
872 | definition_idx = SCM_CDR (definition_idx)) | |
873 | { | |
874 | const SCM definition = SCM_CAR (definition_idx); | |
875 | const SCM canonical_definition = canonicalize_define (definition); | |
876 | const SCM binding = SCM_CDR (canonical_definition); | |
877 | bindings = scm_cons (binding, bindings); | |
878 | }; | |
879 | ||
880 | letrec_tail = scm_cons (bindings, sequence); | |
881 | /* FIXME: forms does not hold information about the file location. */ | |
882 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
883 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
884 | SCM_SETCAR (forms, new_letrec_expression); |
885 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
886 | } |
887 | else | |
888 | { | |
889 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
890 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
891 | } |
892 | } | |
893 | ||
894 | #if (SCM_ENABLE_DEPRECATED == 1) | |
895 | ||
896 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ | |
897 | SCM | |
898 | scm_m_expand_body (SCM exprs, SCM env) | |
899 | { | |
900 | scm_c_issue_deprecation_warning | |
901 | ("`scm_m_expand_body' is deprecated."); | |
9d4bf6d3 MV |
902 | m_expand_body (exprs, env); |
903 | return exprs; | |
910b5125 DH |
904 | } |
905 | ||
906 | #endif | |
907 | ||
908 | ||
9fbee57e | 909 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
910 | |
911 | ||
3b88ed2a | 912 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 913 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 914 | |
8ea46249 | 915 | SCM |
e6729603 | 916 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 917 | { |
e6729603 DH |
918 | const SCM cdr_expr = SCM_CDR (expr); |
919 | const long length = scm_ilength (cdr_expr); | |
920 | ||
921 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
922 | ||
923 | if (length == 0) | |
924 | { | |
925 | /* Special case: (and) is replaced by #t. */ | |
926 | return SCM_BOOL_T; | |
927 | } | |
0f2d19dd | 928 | else |
e6729603 DH |
929 | { |
930 | SCM_SETCAR (expr, SCM_IM_AND); | |
931 | return expr; | |
932 | } | |
0f2d19dd JB |
933 | } |
934 | ||
1cc91f1b | 935 | |
3b88ed2a | 936 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 937 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
938 | |
939 | SCM | |
2a6f7afe | 940 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 941 | { |
2a6f7afe | 942 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
943 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
944 | * That means, there should be a distinction between uses of begin where an | |
945 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
946 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
947 | ||
948 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
949 | return expr; | |
0f2d19dd JB |
950 | } |
951 | ||
952 | ||
3b88ed2a | 953 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 954 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 955 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 956 | |
8ea46249 | 957 | SCM |
2a6f7afe | 958 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 959 | { |
8ea46249 | 960 | SCM clauses; |
2a6f7afe DH |
961 | SCM all_labels = SCM_EOL; |
962 | ||
963 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
964 | const int else_literal_p = literal_p (scm_sym_else, env); | |
965 | ||
966 | const SCM cdr_expr = SCM_CDR (expr); | |
967 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
968 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
969 | ||
970 | clauses = SCM_CDR (cdr_expr); | |
8ea46249 | 971 | while (!SCM_NULLP (clauses)) |
0f2d19dd | 972 | { |
2a6f7afe DH |
973 | SCM labels; |
974 | ||
975 | const SCM clause = SCM_CAR (clauses); | |
976 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
977 | s_bad_case_clause, clause, expr); | |
978 | ||
979 | labels = SCM_CAR (clause); | |
980 | if (SCM_CONSP (labels)) | |
981 | { | |
982 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
983 | s_bad_case_labels, labels, expr); | |
984 | all_labels = scm_append_x (scm_list_2 (labels, all_labels)); | |
985 | } | |
58a2510b DH |
986 | else if (SCM_NULLP (labels)) |
987 | { | |
988 | /* The list of labels is empty. According to R5RS this is allowed. | |
989 | * It means that the sequence of expressions will never be executed. | |
990 | * Therefore, as an optimization, we could remove the whole | |
991 | * clause. */ | |
992 | } | |
2a6f7afe DH |
993 | else |
994 | { | |
995 | ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p, | |
996 | s_bad_case_labels, labels, expr); | |
997 | ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)), | |
609a8b86 | 998 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
999 | } |
1000 | ||
1001 | /* build the new clause */ | |
1002 | if (SCM_EQ_P (labels, scm_sym_else)) | |
1003 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
1004 | ||
8ea46249 | 1005 | clauses = SCM_CDR (clauses); |
0f2d19dd | 1006 | } |
2a6f7afe DH |
1007 | |
1008 | /* Check whether all case labels are distinct. */ | |
1009 | for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels)) | |
1010 | { | |
1011 | const SCM label = SCM_CAR (all_labels); | |
4610b011 DH |
1012 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (label, SCM_CDR (all_labels))), |
1013 | s_duplicate_case_label, label, expr); | |
2a6f7afe DH |
1014 | } |
1015 | ||
1016 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1017 | return expr; | |
0f2d19dd JB |
1018 | } |
1019 | ||
1020 | ||
3b88ed2a | 1021 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1022 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1023 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1024 | |
8ea46249 | 1025 | SCM |
609a8b86 | 1026 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1027 | { |
609a8b86 DH |
1028 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1029 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1030 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1031 | ||
1032 | const SCM clauses = SCM_CDR (expr); | |
1033 | SCM clause_idx; | |
1034 | ||
1035 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1036 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1037 | ||
1038 | for (clause_idx = clauses; | |
1039 | !SCM_NULLP (clause_idx); | |
1040 | clause_idx = SCM_CDR (clause_idx)) | |
0f2d19dd | 1041 | { |
609a8b86 DH |
1042 | SCM test; |
1043 | ||
1044 | const SCM clause = SCM_CAR (clause_idx); | |
1045 | const long length = scm_ilength (clause); | |
1046 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1047 | ||
1048 | test = SCM_CAR (clause); | |
1049 | if (SCM_EQ_P (test, scm_sym_else) && else_literal_p) | |
0f2d19dd | 1050 | { |
609a8b86 DH |
1051 | const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx)); |
1052 | ASSERT_SYNTAX_2 (length >= 2, | |
1053 | s_bad_cond_clause, clause, expr); | |
1054 | ASSERT_SYNTAX_2 (last_clause_p, | |
1055 | s_misplaced_else_clause, clause, expr); | |
1056 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1057 | } |
609a8b86 DH |
1058 | else if (length >= 2 |
1059 | && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow) | |
1060 | && arrow_literal_p) | |
1061 | { | |
1062 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1063 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1064 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1065 | } |
0f2d19dd | 1066 | } |
609a8b86 DH |
1067 | |
1068 | SCM_SETCAR (expr, SCM_IM_COND); | |
1069 | return expr; | |
0f2d19dd JB |
1070 | } |
1071 | ||
1cc91f1b | 1072 | |
0f572ba7 DH |
1073 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1074 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1075 | |
9fbee57e DH |
1076 | /* Guile provides an extension to R5RS' define syntax to represent function |
1077 | * currying in a compact way. With this extension, it is allowed to write | |
1078 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1079 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1080 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1081 | * should be either a sequence of zero or more variables, or a sequence of one | |
1082 | * or more variables followed by a space-delimited period and another | |
1083 | * variable. Each level of argument nesting wraps the <body> within another | |
1084 | * lambda expression. For example, the following forms are allowed, each one | |
1085 | * followed by an equivalent, more explicit implementation. | |
1086 | * Example 1: | |
1087 | * (define ((a b . c) . d) <body>) is equivalent to | |
1088 | * (define a (lambda (b . c) (lambda d <body>))) | |
1089 | * Example 2: | |
1090 | * (define (((a) b) c . d) <body>) is equivalent to | |
1091 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1092 | */ | |
1093 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1094 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1095 | static SCM |
1096 | canonicalize_define (const SCM expr) | |
5280aaca | 1097 | { |
cc56ba80 DH |
1098 | SCM body; |
1099 | SCM variable; | |
1100 | ||
1101 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1102 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1103 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1104 | ||
1105 | body = SCM_CDR (cdr_expr); | |
1106 | variable = SCM_CAR (cdr_expr); | |
1107 | while (SCM_CONSP (variable)) | |
5280aaca | 1108 | { |
cc56ba80 DH |
1109 | /* This while loop realizes function currying by variable nesting. |
1110 | * Variable is known to be a nested-variable. In every iteration of the | |
1111 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1112 | * innermost one. Note that we don't check for duplicate formals here: |
1113 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1114 | const SCM formals = SCM_CDR (variable); |
1115 | const SCM tail = scm_cons (formals, body); | |
1116 | ||
1117 | /* Add source properties to each new lambda expression: */ | |
1118 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1119 | ||
1120 | body = scm_list_1 (lambda); | |
1121 | variable = SCM_CAR (variable); | |
5280aaca | 1122 | } |
cc56ba80 DH |
1123 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); |
1124 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
1125 | ||
0f572ba7 DH |
1126 | SCM_SETCAR (cdr_expr, variable); |
1127 | SCM_SETCDR (cdr_expr, body); | |
1128 | return expr; | |
1129 | } | |
1130 | ||
1131 | SCM | |
1132 | scm_m_define (SCM expr, SCM env) | |
1133 | { | |
6bff1368 | 1134 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 1135 | |
6bff1368 DH |
1136 | { |
1137 | const SCM canonical_definition = canonicalize_define (expr); | |
1138 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1139 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
1140 | const SCM body = SCM_CDR (cdr_canonical_definition); | |
1141 | const SCM value = scm_eval_car (body, env); | |
1142 | ||
1143 | SCM var; | |
1144 | if (SCM_REC_PROCNAMES_P) | |
1145 | { | |
1146 | SCM tmp = value; | |
1147 | while (SCM_MACROP (tmp)) | |
1148 | tmp = SCM_MACRO_CODE (tmp); | |
1149 | if (SCM_CLOSUREP (tmp) | |
1150 | /* Only the first definition determines the name. */ | |
1151 | && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name))) | |
1152 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); | |
1153 | } | |
0f572ba7 | 1154 | |
6bff1368 DH |
1155 | var = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); |
1156 | SCM_VARIABLE_SET (var, value); | |
1157 | ||
1158 | return SCM_UNSPECIFIED; | |
1159 | } | |
0f2d19dd JB |
1160 | } |
1161 | ||
1162 | ||
8ae95199 DH |
1163 | /* This is a helper function for forms (<keyword> <expression>) that are |
1164 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1165 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1166 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1167 | static SCM | |
1168 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1169 | { | |
1170 | const SCM cdr_expr = SCM_CDR (expr); | |
1171 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1172 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1173 | ||
1174 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1175 | ||
1176 | return expr; | |
1177 | } | |
1178 | ||
1179 | ||
3b88ed2a | 1180 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1181 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1182 | |
9fbee57e DH |
1183 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1184 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1185 | * the empty list represents the empty parameter list. This representation | |
1186 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1187 | SCM |
8ae95199 | 1188 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1189 | { |
8ae95199 DH |
1190 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1191 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1192 | return new_expr; | |
0f2d19dd JB |
1193 | } |
1194 | ||
8ea46249 | 1195 | |
a954ce1d DH |
1196 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1197 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1198 | ||
302c12b4 | 1199 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1200 | * reversed here. During the evaluation this allows for simple consing of the |
1201 | * results of the inits and steps: | |
302c12b4 | 1202 | |
0f2d19dd | 1203 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1204 | (<var2> <init2>) |
1205 | ... ) | |
1206 | (<test> <return>) | |
1207 | <body>) | |
302c12b4 | 1208 | |
0f2d19dd | 1209 | ;; becomes |
302c12b4 | 1210 | |
e681d187 | 1211 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1212 | (varn ... var2 var1) |
1213 | (<test> <return>) | |
1214 | (<body>) | |
1215 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1216 | */ |
0f2d19dd | 1217 | SCM |
a954ce1d | 1218 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1219 | { |
a954ce1d DH |
1220 | SCM variables = SCM_EOL; |
1221 | SCM init_forms = SCM_EOL; | |
1222 | SCM step_forms = SCM_EOL; | |
1223 | SCM binding_idx; | |
1224 | SCM cddr_expr; | |
1225 | SCM exit_clause; | |
1226 | SCM commands; | |
1227 | SCM tail; | |
1228 | ||
1229 | const SCM cdr_expr = SCM_CDR (expr); | |
1230 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1231 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1232 | ||
1233 | /* Collect variables, init and step forms. */ | |
1234 | binding_idx = SCM_CAR (cdr_expr); | |
1235 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1236 | s_bad_bindings, binding_idx, expr); | |
1237 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1238 | { |
a954ce1d DH |
1239 | const SCM binding = SCM_CAR (binding_idx); |
1240 | const long length = scm_ilength (binding); | |
1241 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1242 | s_bad_binding, binding, expr); | |
1243 | ||
302c12b4 | 1244 | { |
a954ce1d DH |
1245 | const SCM name = SCM_CAR (binding); |
1246 | const SCM init = SCM_CADR (binding); | |
1247 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
1248 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
4610b011 DH |
1249 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, variables)), |
1250 | s_duplicate_binding, name, expr); | |
1251 | ||
a954ce1d DH |
1252 | variables = scm_cons (name, variables); |
1253 | init_forms = scm_cons (init, init_forms); | |
1254 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1255 | } |
0f2d19dd | 1256 | } |
a954ce1d DH |
1257 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1258 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1259 | ||
1260 | /* Memoize the test form and the exit sequence. */ | |
1261 | cddr_expr = SCM_CDR (cdr_expr); | |
1262 | exit_clause = SCM_CAR (cddr_expr); | |
1263 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1264 | s_bad_exit_clause, exit_clause, expr); | |
1265 | ||
1266 | commands = SCM_CDR (cddr_expr); | |
1267 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1268 | tail = scm_cons2 (init_forms, variables, tail); | |
1269 | SCM_SETCAR (expr, SCM_IM_DO); | |
1270 | SCM_SETCDR (expr, tail); | |
1271 | return expr; | |
0f2d19dd JB |
1272 | } |
1273 | ||
b8229a3b | 1274 | |
3b88ed2a | 1275 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1276 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1277 | |
9fbee57e | 1278 | SCM |
4610b011 | 1279 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1280 | { |
4610b011 DH |
1281 | const SCM cdr_expr = SCM_CDR (expr); |
1282 | const long length = scm_ilength (cdr_expr); | |
1283 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1284 | SCM_SETCAR (expr, SCM_IM_IF); | |
1285 | return expr; | |
0f2d19dd JB |
1286 | } |
1287 | ||
302c12b4 | 1288 | |
3b88ed2a | 1289 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1290 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1291 | |
4610b011 DH |
1292 | /* A helper function for memoize_lambda to support checking for duplicate |
1293 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1294 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1295 | * forms that a formal argument can have: | |
1296 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1297 | static int |
4610b011 | 1298 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1299 | { |
9fbee57e DH |
1300 | for (; SCM_CONSP (list); list = SCM_CDR (list)) |
1301 | { | |
1302 | if (SCM_EQ_P (SCM_CAR (list), obj)) | |
4610b011 | 1303 | return 1; |
9fbee57e DH |
1304 | } |
1305 | return SCM_EQ_P (list, obj); | |
5cb22e96 DH |
1306 | } |
1307 | ||
28d52ebb | 1308 | SCM |
03a3e941 | 1309 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1310 | { |
9fbee57e | 1311 | SCM formals; |
03a3e941 | 1312 | SCM formals_idx; |
34adf7ea DH |
1313 | SCM cddr_expr; |
1314 | int documentation; | |
1315 | SCM body; | |
1316 | SCM new_body; | |
03a3e941 DH |
1317 | |
1318 | const SCM cdr_expr = SCM_CDR (expr); | |
1319 | const long length = scm_ilength (cdr_expr); | |
1320 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1321 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1322 | |
03a3e941 DH |
1323 | /* Before iterating the list of formal arguments, make sure the formals |
1324 | * actually are given as either a symbol or a non-cyclic list. */ | |
1325 | formals = SCM_CAR (cdr_expr); | |
1326 | if (SCM_CONSP (formals)) | |
1327 | { | |
1328 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1329 | * detected, report a 'Bad formals' error. */ | |
1330 | } | |
1331 | else | |
1332 | { | |
1333 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formals) || SCM_NULLP (formals), | |
1334 | s_bad_formals, formals, expr); | |
1335 | } | |
1cc91f1b | 1336 | |
03a3e941 DH |
1337 | /* Now iterate the list of formal arguments to check if all formals are |
1338 | * symbols, and that there are no duplicates. */ | |
1339 | formals_idx = formals; | |
1340 | while (SCM_CONSP (formals_idx)) | |
0f2d19dd | 1341 | { |
03a3e941 DH |
1342 | const SCM formal = SCM_CAR (formals_idx); |
1343 | const SCM next_idx = SCM_CDR (formals_idx); | |
1344 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formal), s_bad_formal, formal, expr); | |
1345 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), | |
1346 | s_duplicate_formal, formal, expr); | |
1347 | formals_idx = next_idx; | |
0f2d19dd | 1348 | } |
03a3e941 DH |
1349 | ASSERT_SYNTAX_2 (SCM_NULLP (formals_idx) || SCM_SYMBOLP (formals_idx), |
1350 | s_bad_formal, formals_idx, expr); | |
9fbee57e | 1351 | |
34adf7ea DH |
1352 | /* Memoize the body. Keep a potential documentation string. */ |
1353 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1354 | * some external database. Otherwise it will slow down execution, since | |
1355 | * the documentation string will have to be skipped with every execution | |
1356 | * of the closure. */ | |
1357 | cddr_expr = SCM_CDR (cdr_expr); | |
1358 | documentation = (length >= 3 && SCM_STRINGP (SCM_CAR (cddr_expr))); | |
1359 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; | |
430b8401 | 1360 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1361 | |
1362 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1363 | if (documentation) | |
1364 | SCM_SETCDR (cddr_expr, new_body); | |
1365 | else | |
1366 | SCM_SETCDR (cdr_expr, new_body); | |
1367 | return expr; | |
0f2d19dd | 1368 | } |
6dbd0af5 | 1369 | |
0f2d19dd | 1370 | |
d6754c23 | 1371 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1372 | static void |
d6754c23 | 1373 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1374 | { |
d6754c23 | 1375 | SCM binding_idx; |
302c12b4 | 1376 | |
d6754c23 DH |
1377 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1378 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1379 | |
d6754c23 DH |
1380 | binding_idx = bindings; |
1381 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1382 | { |
d6754c23 DH |
1383 | SCM name; /* const */ |
1384 | ||
1385 | const SCM binding = SCM_CAR (binding_idx); | |
1386 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1387 | s_bad_binding, binding, expr); | |
1388 | ||
1389 | name = SCM_CAR (binding); | |
1390 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
0f2d19dd | 1391 | } |
d6754c23 | 1392 | } |
26d5b9b4 | 1393 | |
d6754c23 DH |
1394 | |
1395 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1396 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1397 | * variables are returned in a list with their order reversed, and the init | |
1398 | * forms are returned in a list in the same order as they are given in the | |
1399 | * bindings. If a duplicate variable name is detected, an error is | |
1400 | * signalled. */ | |
1401 | static void | |
1402 | transform_bindings ( | |
1403 | const SCM bindings, const SCM expr, | |
1404 | SCM *const rvarptr, SCM *const initptr ) | |
1405 | { | |
1406 | SCM rvariables = SCM_EOL; | |
1407 | SCM rinits = SCM_EOL; | |
1408 | SCM binding_idx = bindings; | |
1409 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
1410 | { | |
1411 | const SCM binding = SCM_CAR (binding_idx); | |
1412 | const SCM cdr_binding = SCM_CDR (binding); | |
1413 | const SCM name = SCM_CAR (binding); | |
1414 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, rvariables)), | |
1415 | s_duplicate_binding, name, expr); | |
1416 | rvariables = scm_cons (name, rvariables); | |
1417 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1418 | } | |
1419 | *rvarptr = rvariables; | |
1420 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1421 | } |
1422 | ||
302c12b4 | 1423 | |
3b88ed2a | 1424 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1425 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1426 | |
d6754c23 DH |
1427 | /* This function is a helper function for memoize_let. It transforms |
1428 | * (let name ((var init) ...) body ...) into | |
1429 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1430 | * and memoizes the expression. It is assumed that the caller has checked | |
1431 | * that name is a symbol and that there are bindings and a body. */ | |
1432 | static SCM | |
1433 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1434 | { | |
1435 | SCM rvariables; | |
1436 | SCM variables; | |
1437 | SCM inits; | |
1438 | ||
1439 | const SCM cdr_expr = SCM_CDR (expr); | |
1440 | const SCM name = SCM_CAR (cdr_expr); | |
1441 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1442 | const SCM bindings = SCM_CAR (cddr_expr); | |
1443 | check_bindings (bindings, expr); | |
1444 | ||
1445 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1446 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1447 | ||
1448 | { | |
1449 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1450 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1451 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1452 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1453 | ||
1454 | const SCM rvar = scm_list_1 (name); | |
1455 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1456 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1457 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1458 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1459 | return scm_cons_source (expr, letrec_form, inits); | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1464 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1465 | SCM |
d6754c23 | 1466 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1467 | { |
d6754c23 DH |
1468 | SCM bindings; |
1469 | ||
1470 | const SCM cdr_expr = SCM_CDR (expr); | |
1471 | const long length = scm_ilength (cdr_expr); | |
1472 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1473 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1474 | |
d6754c23 DH |
1475 | bindings = SCM_CAR (cdr_expr); |
1476 | if (SCM_SYMBOLP (bindings)) | |
26d5b9b4 | 1477 | { |
d6754c23 DH |
1478 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1479 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1480 | } |
d6754c23 DH |
1481 | |
1482 | check_bindings (bindings, expr); | |
1483 | if (SCM_NULLP (bindings) || SCM_NULLP (SCM_CDR (bindings))) | |
26d5b9b4 | 1484 | { |
d6754c23 | 1485 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1486 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1487 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1488 | } |
302c12b4 DH |
1489 | else |
1490 | { | |
d6754c23 DH |
1491 | /* plain let */ |
1492 | SCM rvariables; | |
1493 | SCM inits; | |
1494 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1495 | |
302c12b4 | 1496 | { |
430b8401 | 1497 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1498 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1499 | SCM_SETCAR (expr, SCM_IM_LET); | |
1500 | SCM_SETCDR (expr, new_tail); | |
1501 | return expr; | |
302c12b4 DH |
1502 | } |
1503 | } | |
0f2d19dd JB |
1504 | } |
1505 | ||
1506 | ||
3b88ed2a | 1507 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1508 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1509 | |
d6754c23 DH |
1510 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1511 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1512 | SCM |
d6754c23 | 1513 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1514 | { |
d6754c23 | 1515 | SCM binding_idx; |
d6754c23 | 1516 | SCM new_body; |
0f2d19dd | 1517 | |
d6754c23 DH |
1518 | const SCM cdr_expr = SCM_CDR (expr); |
1519 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1520 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1521 | |
d6754c23 DH |
1522 | binding_idx = SCM_CAR (cdr_expr); |
1523 | check_bindings (binding_idx, expr); | |
1524 | ||
461bffb1 DH |
1525 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1526 | * transformation is done in place. At the beginning of one iteration of | |
1527 | * the loop the variable binding_idx holds the form | |
1528 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1529 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1530 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1531 | * untouched. After the execution of the loop, P1 will hold | |
1532 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1533 | * and binding_idx will hold P3. */ | |
1534 | while (!SCM_NULLP (binding_idx)) | |
9fbee57e | 1535 | { |
461bffb1 | 1536 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1537 | const SCM binding = SCM_CAR (binding_idx); |
1538 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1539 | const SCM cdr_binding = SCM_CDR (binding); |
1540 | ||
1541 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1542 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1543 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1544 | ||
1545 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1546 | } |
1547 | ||
430b8401 | 1548 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1549 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1550 | /* the bindings have been changed in place */ | |
1551 | SCM_SETCDR (cdr_expr, new_body); | |
1552 | return expr; | |
9fbee57e | 1553 | } |
b8229a3b | 1554 | |
0f2d19dd | 1555 | |
3b88ed2a | 1556 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); |
9fbee57e | 1557 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); |
1cc91f1b | 1558 | |
0f2d19dd | 1559 | SCM |
d6754c23 | 1560 | scm_m_letrec (SCM expr, SCM env) |
0f2d19dd | 1561 | { |
d6754c23 DH |
1562 | SCM bindings; |
1563 | ||
1564 | const SCM cdr_expr = SCM_CDR (expr); | |
1565 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1566 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1567 | ||
1568 | bindings = SCM_CAR (cdr_expr); | |
1569 | if (SCM_NULLP (bindings)) | |
9fbee57e | 1570 | { |
d6754c23 | 1571 | /* no bindings, let* is executed faster */ |
430b8401 | 1572 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1573 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); |
9fbee57e DH |
1574 | } |
1575 | else | |
1576 | { | |
d6754c23 DH |
1577 | SCM rvariables; |
1578 | SCM inits; | |
1579 | SCM new_body; | |
1580 | ||
1581 | check_bindings (bindings, expr); | |
1582 | transform_bindings (bindings, expr, &rvariables, &inits); | |
430b8401 | 1583 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1584 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); |
9fbee57e | 1585 | } |
0f2d19dd JB |
1586 | } |
1587 | ||
73b64342 | 1588 | |
3b88ed2a | 1589 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1590 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1591 | |
1592 | SCM | |
21628685 | 1593 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1594 | { |
21628685 DH |
1595 | const SCM cdr_expr = SCM_CDR (expr); |
1596 | const long length = scm_ilength (cdr_expr); | |
1597 | ||
1598 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1599 | ||
1600 | if (length == 0) | |
1601 | { | |
1602 | /* Special case: (or) is replaced by #f. */ | |
1603 | return SCM_BOOL_F; | |
1604 | } | |
9fbee57e | 1605 | else |
21628685 DH |
1606 | { |
1607 | SCM_SETCAR (expr, SCM_IM_OR); | |
1608 | return expr; | |
1609 | } | |
73b64342 MD |
1610 | } |
1611 | ||
73b64342 | 1612 | |
9fbee57e DH |
1613 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1614 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1615 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1616 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1617 | |
1618 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1619 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1620 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1621 | * nesting level and is known to be greater than zero. */ | |
1622 | static SCM | |
1623 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1624 | { |
9fbee57e | 1625 | if (SCM_CONSP (form)) |
c96d76b8 | 1626 | { |
21628685 | 1627 | const SCM tmp = SCM_CAR (form); |
9fbee57e DH |
1628 | if (SCM_EQ_P (tmp, scm_sym_quasiquote)) |
1629 | { | |
21628685 DH |
1630 | const SCM args = SCM_CDR (form); |
1631 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1632 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1633 | } | |
1634 | else if (SCM_EQ_P (tmp, scm_sym_unquote)) | |
1635 | { | |
21628685 DH |
1636 | const SCM args = SCM_CDR (form); |
1637 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1638 | if (depth - 1 == 0) |
1639 | return scm_eval_car (args, env); | |
1640 | else | |
1641 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1642 | } | |
1643 | else if (SCM_CONSP (tmp) | |
1644 | && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing)) | |
1645 | { | |
21628685 DH |
1646 | const SCM args = SCM_CDR (tmp); |
1647 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1648 | if (depth - 1 == 0) |
1649 | { | |
21628685 DH |
1650 | const SCM list = scm_eval_car (args, env); |
1651 | const SCM rest = SCM_CDR (form); | |
1652 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1653 | s_splicing, list, form); | |
9fbee57e DH |
1654 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1655 | } | |
1656 | else | |
1657 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1658 | iqq (SCM_CDR (form), env, depth)); | |
1659 | } | |
1660 | else | |
1661 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1662 | iqq (SCM_CDR (form), env, depth)); | |
1663 | } | |
1664 | else if (SCM_VECTORP (form)) | |
c96d76b8 | 1665 | { |
9fbee57e DH |
1666 | size_t i = SCM_VECTOR_LENGTH (form); |
1667 | SCM const *const data = SCM_VELTS (form); | |
1668 | SCM tmp = SCM_EOL; | |
1669 | while (i != 0) | |
1670 | tmp = scm_cons (data[--i], tmp); | |
1671 | scm_remember_upto_here_1 (form); | |
1672 | return scm_vector (iqq (tmp, env, depth)); | |
c96d76b8 | 1673 | } |
9fbee57e DH |
1674 | else |
1675 | return form; | |
1676 | } | |
1677 | ||
1678 | SCM | |
21628685 | 1679 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1680 | { |
21628685 DH |
1681 | const SCM cdr_expr = SCM_CDR (expr); |
1682 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1683 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1684 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1685 | } |
1686 | ||
1687 | ||
3b88ed2a | 1688 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1689 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1690 | ||
1691 | SCM | |
21628685 | 1692 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1693 | { |
21628685 DH |
1694 | SCM quotee; |
1695 | ||
1696 | const SCM cdr_expr = SCM_CDR (expr); | |
1697 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1698 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1699 | quotee = SCM_CAR (cdr_expr); | |
1700 | if (SCM_IMP (quotee) && !SCM_NULLP (quotee)) | |
1701 | return quotee; | |
1702 | else if (SCM_VECTORP (quotee)) | |
1703 | return quotee; | |
1704 | #if 0 | |
1705 | /* The following optimization would be possible if all variable references | |
1706 | * were resolved during memoization: */ | |
1707 | else if (SCM_SYMBOLP (quotee)) | |
1708 | return quotee; | |
1709 | #endif | |
1710 | SCM_SETCAR (expr, SCM_IM_QUOTE); | |
1711 | return expr; | |
9fbee57e DH |
1712 | } |
1713 | ||
1714 | ||
1715 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1716 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1717 | static const char s_set_x[] = "set!"; |
1718 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1719 | ||
1720 | SCM | |
82b3e2c6 | 1721 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1722 | { |
82b3e2c6 DH |
1723 | SCM variable; |
1724 | ||
1725 | const SCM cdr_expr = SCM_CDR (expr); | |
1726 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1727 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1728 | variable = SCM_CAR (cdr_expr); | |
7893dbbf MV |
1729 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable) || SCM_VARIABLEP (variable), |
1730 | s_bad_variable, variable, expr); | |
82b3e2c6 DH |
1731 | |
1732 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
1733 | return expr; | |
9fbee57e DH |
1734 | } |
1735 | ||
1736 | ||
1737 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1738 | ||
1739 | ||
3b88ed2a | 1740 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1741 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1742 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1743 | ||
1744 | SCM | |
82b3e2c6 | 1745 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1746 | { |
82b3e2c6 DH |
1747 | const SCM cdr_expr = SCM_CDR (expr); |
1748 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1749 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1750 | |
82b3e2c6 DH |
1751 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1752 | return expr; | |
1753 | } | |
2e171178 | 1754 | |
2e171178 | 1755 | |
3b88ed2a | 1756 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1757 | |
82b3e2c6 DH |
1758 | /* FIXME: The following explanation should go into the documentation: */ |
1759 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1760 | * the global variables named by `var's (symbols, not evaluated), creating | |
1761 | * them if they don't exist, executes body, and then restores the previous | |
1762 | * values of the `var's. Additionally, whenever control leaves body, the | |
1763 | * values of the `var's are saved and restored when control returns. It is an | |
1764 | * error when a symbol appears more than once among the `var's. All `init's | |
1765 | * are evaluated before any `var' is set. | |
1766 | * | |
1767 | * Think of this as `let' for dynamic scope. | |
1768 | */ | |
1769 | ||
1770 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
1771 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
1772 | * | |
1773 | * FIXME - also implement `@bind*'. | |
1774 | */ | |
73b64342 | 1775 | SCM |
82b3e2c6 | 1776 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 1777 | { |
82b3e2c6 DH |
1778 | SCM bindings; |
1779 | SCM rvariables; | |
1780 | SCM inits; | |
1781 | SCM variable_idx; | |
2e171178 | 1782 | |
82b3e2c6 | 1783 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 1784 | |
82b3e2c6 DH |
1785 | const SCM cdr_expr = SCM_CDR (expr); |
1786 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1787 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1788 | bindings = SCM_CAR (cdr_expr); | |
1789 | check_bindings (bindings, expr); | |
1790 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1791 | ||
1792 | for (variable_idx = rvariables; | |
1793 | !SCM_NULLP (variable_idx); | |
1794 | variable_idx = SCM_CDR (variable_idx)) | |
73b64342 | 1795 | { |
82b3e2c6 DH |
1796 | /* The first call to scm_sym2var will look beyond the current module, |
1797 | * while the second call wont. */ | |
1798 | const SCM variable = SCM_CAR (variable_idx); | |
1799 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
1800 | if (SCM_FALSEP (new_variable)) | |
1801 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); | |
1802 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 1803 | } |
82b3e2c6 DH |
1804 | |
1805 | SCM_SETCAR (expr, SCM_IM_BIND); | |
1806 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
1807 | return expr; | |
73b64342 | 1808 | } |
73b64342 | 1809 | |
b0c5d67b | 1810 | |
3b88ed2a | 1811 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
1812 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
1813 | ||
9fbee57e | 1814 | SCM |
da48db62 | 1815 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1816 | { |
da48db62 DH |
1817 | const SCM cdr_expr = SCM_CDR (expr); |
1818 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1819 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1820 | ||
1821 | SCM_SETCAR (expr, SCM_IM_CONT); | |
1822 | return expr; | |
b0c5d67b | 1823 | } |
b0c5d67b DH |
1824 | |
1825 | ||
3b88ed2a | 1826 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 1827 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
1828 | |
1829 | SCM | |
da48db62 | 1830 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1831 | { |
da48db62 DH |
1832 | const SCM cdr_expr = SCM_CDR (expr); |
1833 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1834 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1835 | ||
1836 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
1837 | return expr; | |
b0c5d67b | 1838 | } |
b0c5d67b DH |
1839 | |
1840 | ||
3b88ed2a | 1841 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 1842 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 1843 | |
9fbee57e DH |
1844 | /* Like promises, futures are implemented as closures with an empty |
1845 | * parameter list. Thus, (future <expression>) is transformed into | |
1846 | * (#@future '() <expression>), where the empty list represents the | |
1847 | * empty parameter list. This representation allows for easy creation | |
1848 | * of the closure during evaluation. */ | |
a513ead3 | 1849 | SCM |
8ae95199 | 1850 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 1851 | { |
8ae95199 DH |
1852 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1853 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
1854 | return new_expr; | |
a513ead3 MV |
1855 | } |
1856 | ||
9fbee57e | 1857 | |
3b88ed2a | 1858 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
1859 | SCM_SYMBOL (scm_sym_setter, "setter"); |
1860 | ||
1861 | SCM | |
7893dbbf | 1862 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 1863 | { |
7893dbbf | 1864 | SCM target, exp_target; |
da48db62 DH |
1865 | |
1866 | const SCM cdr_expr = SCM_CDR (expr); | |
1867 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1868 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1869 | ||
1870 | target = SCM_CAR (cdr_expr); | |
1871 | if (!SCM_CONSP (target)) | |
1872 | { | |
1873 | /* R5RS usage */ | |
1874 | return scm_m_set_x (expr, env); | |
1875 | } | |
9fbee57e | 1876 | else |
da48db62 DH |
1877 | { |
1878 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
1879 | /* Macroexpanding the target might return things of the form |
1880 | (begin <atom>). In that case, <atom> must be a symbol or a | |
1881 | variable and we memoize to (set! <atom> ...). | |
1882 | */ | |
1883 | exp_target = scm_macroexp (target, env); | |
1884 | if (SCM_EQ_P (SCM_CAR (exp_target), SCM_IM_BEGIN) | |
1885 | && !SCM_NULLP (SCM_CDR (exp_target)) | |
1886 | && SCM_NULLP (SCM_CDDR (exp_target))) | |
1887 | { | |
1888 | exp_target= SCM_CADR (exp_target); | |
6d1a2e9f MV |
1889 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (exp_target) |
1890 | || SCM_VARIABLEP (exp_target), | |
1891 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
1892 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
1893 | SCM_CDR (cdr_expr))); | |
1894 | } | |
1895 | else | |
1896 | { | |
1897 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
1898 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
1899 | setter_proc_tail); | |
da48db62 | 1900 | |
7893dbbf MV |
1901 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
1902 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
1903 | cddr_expr)); | |
da48db62 | 1904 | |
7893dbbf MV |
1905 | SCM_SETCAR (expr, setter_proc); |
1906 | SCM_SETCDR (expr, setter_args); | |
1907 | return expr; | |
1908 | } | |
da48db62 | 1909 | } |
9fbee57e DH |
1910 | } |
1911 | ||
1912 | ||
a4aa2134 DH |
1913 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
1914 | * soon as the module system allows us to more freely create bindings in | |
1915 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1916 | * moved here. */ | |
9fbee57e | 1917 | SCM |
9a848baf | 1918 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1919 | { |
9a848baf DH |
1920 | SCM slot_nr; |
1921 | ||
1922 | const SCM cdr_expr = SCM_CDR (expr); | |
1923 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1924 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1925 | slot_nr = SCM_CADR (cdr_expr); | |
1926 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
9fbee57e | 1927 | |
9a848baf DH |
1928 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
1929 | return expr; | |
1930 | } | |
9fbee57e | 1931 | |
9fbee57e | 1932 | |
a4aa2134 DH |
1933 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
1934 | * soon as the module system allows us to more freely create bindings in | |
1935 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1936 | * moved here. */ | |
9fbee57e | 1937 | SCM |
9a848baf | 1938 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1939 | { |
9a848baf DH |
1940 | SCM slot_nr; |
1941 | ||
1942 | const SCM cdr_expr = SCM_CDR (expr); | |
1943 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1944 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
1945 | slot_nr = SCM_CADR (cdr_expr); | |
1946 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
1947 | ||
1948 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
1949 | return expr; | |
9fbee57e | 1950 | } |
9fbee57e DH |
1951 | |
1952 | ||
1953 | #if SCM_ENABLE_ELISP | |
1954 | ||
70c1c108 DH |
1955 | static const char s_defun[] = "Symbol's function definition is void"; |
1956 | ||
3b88ed2a | 1957 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 1958 | |
70c1c108 DH |
1959 | /* nil-cond expressions have the form |
1960 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 1961 | SCM |
70c1c108 | 1962 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1963 | { |
70c1c108 DH |
1964 | const long length = scm_ilength (SCM_CDR (expr)); |
1965 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1966 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
1967 | ||
1968 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
1969 | return expr; | |
9fbee57e DH |
1970 | } |
1971 | ||
1972 | ||
3b88ed2a | 1973 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 1974 | |
70c1c108 DH |
1975 | /* The @fop-macro handles procedure and macro applications for elisp. The |
1976 | * input expression must have the form | |
1977 | * (@fop <var> (transformer-macro <expr> ...)) | |
1978 | * where <var> must be a symbol. The expression is transformed into the | |
1979 | * memoized form of either | |
1980 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
1981 | * if the value of var (across all aliasing) is not a macro, or | |
1982 | * (<un-aliased var> <expr> ...) | |
1983 | * if var is a macro. */ | |
9fbee57e | 1984 | SCM |
70c1c108 | 1985 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1986 | { |
70c1c108 DH |
1987 | SCM location; |
1988 | SCM symbol; | |
1989 | ||
1990 | const SCM cdr_expr = SCM_CDR (expr); | |
1991 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1992 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
1993 | ||
1994 | symbol = SCM_CAR (cdr_expr); | |
1995 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (symbol), s_bad_variable, symbol, expr); | |
1996 | ||
1997 | location = scm_symbol_fref (symbol); | |
1998 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
1999 | ||
2000 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
2001 | * look up such definitions, the chain of symbol definitions has to be | |
2002 | * followed up to the terminal symbol. */ | |
2003 | while (SCM_SYMBOLP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2004 | { |
70c1c108 DH |
2005 | const SCM alias = SCM_VARIABLE_REF (location); |
2006 | location = scm_symbol_fref (alias); | |
2007 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 2008 | } |
70c1c108 DH |
2009 | |
2010 | /* Memoize the value location belonging to the terminal symbol. */ | |
2011 | SCM_SETCAR (cdr_expr, location); | |
2012 | ||
2013 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2014 | { |
70c1c108 DH |
2015 | /* Since the location does not contain a macro, the form is a procedure |
2016 | * application. Replace `@fop' by `@apply' and transform the expression | |
2017 | * including the `transformer-macro'. */ | |
2018 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2019 | return expr; | |
2020 | } | |
2021 | else | |
2022 | { | |
2023 | /* Since the location contains a macro, the arguments should not be | |
2024 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2025 | * expression starts with the memoized variable, that is at the cdr of | |
2026 | * the input expression. */ | |
2027 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2028 | return cdr_expr; | |
9fbee57e | 2029 | } |
9fbee57e DH |
2030 | } |
2031 | ||
2032 | #endif /* SCM_ENABLE_ELISP */ | |
2033 | ||
2034 | ||
f58c472a DH |
2035 | /* Start of the memoizers for deprecated macros. */ |
2036 | ||
2037 | ||
2038 | #if (SCM_ENABLE_DEPRECATED == 1) | |
2039 | ||
2040 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2041 | ||
2042 | SCM | |
70c1c108 | 2043 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2044 | { |
70c1c108 DH |
2045 | SCM variable; |
2046 | SCM location; | |
2047 | ||
2048 | const SCM cdr_expr = SCM_CDR (expr); | |
2049 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2050 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2051 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2052 | ||
2053 | variable = SCM_CAR (cdr_expr); | |
2054 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
2055 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); | |
2056 | ASSERT_SYNTAX_2 (!SCM_FALSEP (location) | |
2057 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), | |
2058 | "variable already unbound ", variable, expr); | |
2059 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2060 | return SCM_UNSPECIFIED; |
f58c472a DH |
2061 | } |
2062 | ||
2063 | #endif | |
2064 | ||
2065 | ||
6f81708a DH |
2066 | #if (SCM_ENABLE_DEPRECATED == 1) |
2067 | ||
26d5b9b4 MD |
2068 | SCM |
2069 | scm_macroexp (SCM x, SCM env) | |
2070 | { | |
86d31dfe | 2071 | SCM res, proc, orig_sym; |
26d5b9b4 MD |
2072 | |
2073 | /* Don't bother to produce error messages here. We get them when we | |
2074 | eventually execute the code for real. */ | |
2075 | ||
2076 | macro_tail: | |
86d31dfe MV |
2077 | orig_sym = SCM_CAR (x); |
2078 | if (!SCM_SYMBOLP (orig_sym)) | |
26d5b9b4 MD |
2079 | return x; |
2080 | ||
26d5b9b4 MD |
2081 | { |
2082 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
2083 | if (proc_ptr == NULL) | |
2084 | { | |
2085 | /* We have lost the race. */ | |
2086 | goto macro_tail; | |
2087 | } | |
2088 | proc = *proc_ptr; | |
2089 | } | |
26d5b9b4 MD |
2090 | |
2091 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
2092 | special forms and should not be evaluated here. */ | |
2093 | ||
3b88ed2a DH |
2094 | if (!SCM_MACROP (proc) |
2095 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
26d5b9b4 MD |
2096 | return x; |
2097 | ||
86d31dfe | 2098 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ |
fdc28395 | 2099 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); |
26d5b9b4 MD |
2100 | |
2101 | if (scm_ilength (res) <= 0) | |
8ea46249 | 2102 | res = scm_list_2 (SCM_IM_BEGIN, res); |
26d5b9b4 | 2103 | |
26d5b9b4 MD |
2104 | SCM_DEFER_INTS; |
2105 | SCM_SETCAR (x, SCM_CAR (res)); | |
2106 | SCM_SETCDR (x, SCM_CDR (res)); | |
2107 | SCM_ALLOW_INTS; | |
2108 | ||
2109 | goto macro_tail; | |
2110 | } | |
73b64342 | 2111 | |
6f81708a DH |
2112 | #endif |
2113 | ||
2114 | /*****************************************************************************/ | |
2115 | /*****************************************************************************/ | |
2116 | /* The definitions for unmemoization start here. */ | |
2117 | /*****************************************************************************/ | |
2118 | /*****************************************************************************/ | |
2119 | ||
a44a9715 DH |
2120 | #define SCM_BIT7(x) (127 & SCM_UNPACK (x)) |
2121 | ||
6f81708a | 2122 | SCM_SYMBOL (sym_three_question_marks, "???"); |
a44a9715 | 2123 | |
60a49842 | 2124 | |
6dbd0af5 MD |
2125 | /* scm_unmemocopy takes a memoized expression together with its |
2126 | * environment and rewrites it to its original form. Thus, it is the | |
2127 | * inversion of the rewrite rules above. The procedure is not | |
2128 | * optimized for speed. It's used in scm_iprin1 when printing the | |
220ff1eb MD |
2129 | * code of a closure, in scm_procedure_source, in display_frame when |
2130 | * generating the source for a stackframe in a backtrace, and in | |
2131 | * display_expression. | |
86d31dfe | 2132 | * |
c96d76b8 | 2133 | * Unmemoizing is not a reliable process. You cannot in general |
86d31dfe MV |
2134 | * expect to get the original source back. |
2135 | * | |
2136 | * However, GOOPS currently relies on this for method compilation. | |
2137 | * This ought to change. | |
26d5b9b4 MD |
2138 | */ |
2139 | ||
8ea46249 | 2140 | static SCM |
60a49842 | 2141 | build_binding_list (SCM rnames, SCM rinits) |
8ea46249 DH |
2142 | { |
2143 | SCM bindings = SCM_EOL; | |
60a49842 | 2144 | while (!SCM_NULLP (rnames)) |
8ea46249 | 2145 | { |
60a49842 | 2146 | SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); |
8ea46249 | 2147 | bindings = scm_cons (binding, bindings); |
60a49842 DH |
2148 | rnames = SCM_CDR (rnames); |
2149 | rinits = SCM_CDR (rinits); | |
8ea46249 DH |
2150 | } |
2151 | return bindings; | |
2152 | } | |
2153 | ||
60a49842 | 2154 | |
6f81708a DH |
2155 | static SCM |
2156 | unmemocar (SCM form, SCM env) | |
60a49842 DH |
2157 | { |
2158 | if (!SCM_CONSP (form)) | |
2159 | return form; | |
2160 | else | |
2161 | { | |
2162 | SCM c = SCM_CAR (form); | |
2163 | if (SCM_VARIABLEP (c)) | |
2164 | { | |
2165 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
2166 | if (SCM_FALSEP (sym)) | |
2167 | sym = sym_three_question_marks; | |
2168 | SCM_SETCAR (form, sym); | |
2169 | } | |
2170 | else if (SCM_ILOCP (c)) | |
2171 | { | |
2172 | unsigned long int ir; | |
2173 | ||
2174 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2175 | env = SCM_CDR (env); | |
2176 | env = SCM_CAAR (env); | |
2177 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2178 | env = SCM_CDR (env); | |
f62b9dff | 2179 | |
60a49842 DH |
2180 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2181 | } | |
2182 | return form; | |
2183 | } | |
2184 | } | |
2185 | ||
6f81708a DH |
2186 | |
2187 | #if (SCM_ENABLE_DEPRECATED == 1) | |
2188 | ||
2189 | SCM | |
2190 | scm_unmemocar (SCM form, SCM env) | |
2191 | { | |
2192 | return unmemocar (form, env); | |
2193 | } | |
2194 | ||
2195 | #endif | |
2196 | ||
2197 | ||
6bff1368 DH |
2198 | SCM |
2199 | scm_unmemocopy (SCM x, SCM env) | |
6dbd0af5 MD |
2200 | { |
2201 | SCM ls, z; | |
6dbd0af5 | 2202 | SCM p; |
21628685 DH |
2203 | |
2204 | if (SCM_VECTORP (x)) | |
2205 | { | |
2206 | return scm_list_2 (scm_sym_quote, x); | |
2207 | } | |
2208 | else if (!SCM_CONSP (x)) | |
6dbd0af5 | 2209 | return x; |
21628685 | 2210 | |
6dbd0af5 | 2211 | p = scm_whash_lookup (scm_source_whash, x); |
8ea46249 | 2212 | switch (SCM_ITAG7 (SCM_CAR (x))) |
6dbd0af5 | 2213 | { |
1b43d24c | 2214 | case SCM_BIT7 (SCM_IM_AND): |
2f0d1375 | 2215 | ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED); |
6dbd0af5 | 2216 | break; |
1b43d24c | 2217 | case SCM_BIT7 (SCM_IM_BEGIN): |
2f0d1375 | 2218 | ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED); |
6dbd0af5 | 2219 | break; |
1b43d24c | 2220 | case SCM_BIT7 (SCM_IM_CASE): |
2f0d1375 | 2221 | ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED); |
6dbd0af5 | 2222 | break; |
1b43d24c | 2223 | case SCM_BIT7 (SCM_IM_COND): |
2f0d1375 | 2224 | ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED); |
6dbd0af5 | 2225 | break; |
1b43d24c | 2226 | case SCM_BIT7 (SCM_IM_DO): |
6dbd0af5 | 2227 | { |
e681d187 DH |
2228 | /* format: (#@do (i1 ... ik) (nk nk-1 ...) (test) (body) s1 ... sk), |
2229 | * where ix is an initializer for a local variable, nx is the name of | |
8ea46249 DH |
2230 | * the local variable, test is the test clause of the do loop, body is |
2231 | * the body of the do loop and sx are the step clauses for the local | |
2232 | * variables. */ | |
2233 | SCM names, inits, test, memoized_body, steps, bindings; | |
2234 | ||
6dbd0af5 | 2235 | x = SCM_CDR (x); |
6bff1368 | 2236 | inits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); |
e681d187 DH |
2237 | x = SCM_CDR (x); |
2238 | names = SCM_CAR (x); | |
821f18a4 | 2239 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); |
6dbd0af5 | 2240 | x = SCM_CDR (x); |
6bff1368 | 2241 | test = scm_unmemocopy (SCM_CAR (x), env); |
8ea46249 DH |
2242 | x = SCM_CDR (x); |
2243 | memoized_body = SCM_CAR (x); | |
2244 | x = SCM_CDR (x); | |
6bff1368 | 2245 | steps = scm_reverse (scm_unmemocopy (x, env)); |
8ea46249 | 2246 | |
26d5b9b4 | 2247 | /* build transformed binding list */ |
8ea46249 DH |
2248 | bindings = SCM_EOL; |
2249 | while (!SCM_NULLP (names)) | |
6dbd0af5 | 2250 | { |
8ea46249 DH |
2251 | SCM name = SCM_CAR (names); |
2252 | SCM init = SCM_CAR (inits); | |
2253 | SCM step = SCM_CAR (steps); | |
2254 | step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step); | |
2255 | ||
2256 | bindings = scm_cons (scm_cons2 (name, init, step), bindings); | |
2257 | ||
2258 | names = SCM_CDR (names); | |
2259 | inits = SCM_CDR (inits); | |
2260 | steps = SCM_CDR (steps); | |
6dbd0af5 | 2261 | } |
8ea46249 DH |
2262 | z = scm_cons (test, SCM_UNSPECIFIED); |
2263 | ls = scm_cons2 (scm_sym_do, bindings, z); | |
2264 | ||
2265 | x = scm_cons (SCM_BOOL_F, memoized_body); | |
2266 | break; | |
2267 | } | |
1b43d24c | 2268 | case SCM_BIT7 (SCM_IM_IF): |
8ea46249 DH |
2269 | ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED); |
2270 | break; | |
1b43d24c | 2271 | case SCM_BIT7 (SCM_IM_LET): |
8ea46249 DH |
2272 | { |
2273 | /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...), | |
2274 | * where nx is the name of a local variable, ix is an initializer for | |
2275 | * the local variable and by are the body clauses. */ | |
60a49842 | 2276 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2277 | |
2278 | x = SCM_CDR (x); | |
60a49842 | 2279 | rnames = SCM_CAR (x); |
8ea46249 | 2280 | x = SCM_CDR (x); |
6bff1368 | 2281 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); |
60a49842 | 2282 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); |
8ea46249 | 2283 | |
60a49842 | 2284 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2285 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2286 | ls = scm_cons (scm_sym_let, z); | |
2287 | break; | |
2288 | } | |
1b43d24c | 2289 | case SCM_BIT7 (SCM_IM_LETREC): |
8ea46249 | 2290 | { |
60a49842 DH |
2291 | /* format: (#@letrec (vn ... v2 v1) (i1 i2 ... in) b1 ...), |
2292 | * where vx is the name of a local variable, ix is an initializer for | |
8ea46249 | 2293 | * the local variable and by are the body clauses. */ |
60a49842 | 2294 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2295 | |
2296 | x = SCM_CDR (x); | |
60a49842 DH |
2297 | rnames = SCM_CAR (x); |
2298 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
8ea46249 | 2299 | x = SCM_CDR (x); |
6bff1368 | 2300 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); |
8ea46249 | 2301 | |
60a49842 | 2302 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2303 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2304 | ls = scm_cons (scm_sym_letrec, z); | |
6dbd0af5 MD |
2305 | break; |
2306 | } | |
1b43d24c | 2307 | case SCM_BIT7 (SCM_IM_LETSTAR): |
6dbd0af5 MD |
2308 | { |
2309 | SCM b, y; | |
2310 | x = SCM_CDR (x); | |
2311 | b = SCM_CAR (x); | |
2312 | y = SCM_EOL; | |
2313 | if SCM_IMP (b) | |
2314 | { | |
821f18a4 | 2315 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
6dbd0af5 MD |
2316 | goto letstar; |
2317 | } | |
2318 | y = z = scm_acons (SCM_CAR (b), | |
2319 | unmemocar ( | |
6bff1368 | 2320 | scm_cons (scm_unmemocopy (SCM_CADR (b), env), SCM_EOL), env), |
6dbd0af5 | 2321 | SCM_UNSPECIFIED); |
821f18a4 | 2322 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2323 | b = SCM_CDDR (b); |
6dbd0af5 MD |
2324 | if (SCM_IMP (b)) |
2325 | { | |
2326 | SCM_SETCDR (y, SCM_EOL); | |
05b15362 DH |
2327 | z = scm_cons (y, SCM_UNSPECIFIED); |
2328 | ls = scm_cons (scm_sym_let, z); | |
6dbd0af5 MD |
2329 | break; |
2330 | } | |
2331 | do | |
2332 | { | |
a23afe53 MD |
2333 | SCM_SETCDR (z, scm_acons (SCM_CAR (b), |
2334 | unmemocar ( | |
6bff1368 | 2335 | scm_list_1 (scm_unmemocopy (SCM_CADR (b), env)), env), |
a23afe53 MD |
2336 | SCM_UNSPECIFIED)); |
2337 | z = SCM_CDR (z); | |
821f18a4 | 2338 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2339 | b = SCM_CDDR (b); |
6dbd0af5 | 2340 | } |
ff467021 | 2341 | while (SCM_NIMP (b)); |
a23afe53 | 2342 | SCM_SETCDR (z, SCM_EOL); |
6dbd0af5 | 2343 | letstar: |
05b15362 DH |
2344 | z = scm_cons (y, SCM_UNSPECIFIED); |
2345 | ls = scm_cons (scm_sym_letstar, z); | |
6dbd0af5 MD |
2346 | break; |
2347 | } | |
1b43d24c | 2348 | case SCM_BIT7 (SCM_IM_OR): |
2f0d1375 | 2349 | ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED); |
6dbd0af5 | 2350 | break; |
1b43d24c | 2351 | case SCM_BIT7 (SCM_IM_LAMBDA): |
6dbd0af5 | 2352 | x = SCM_CDR (x); |
8ea46249 DH |
2353 | z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED); |
2354 | ls = scm_cons (scm_sym_lambda, z); | |
821f18a4 | 2355 | env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env); |
6dbd0af5 | 2356 | break; |
1b43d24c | 2357 | case SCM_BIT7 (SCM_IM_QUOTE): |
2f0d1375 | 2358 | ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED); |
6dbd0af5 | 2359 | break; |
1b43d24c | 2360 | case SCM_BIT7 (SCM_IM_SET_X): |
89efbff4 | 2361 | ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED); |
6dbd0af5 | 2362 | break; |
1b43d24c | 2363 | case SCM_BIT7 (SCM_MAKISYM (0)): |
6dbd0af5 | 2364 | z = SCM_CAR (x); |
ff467021 | 2365 | switch (SCM_ISYMNUM (z)) |
6dbd0af5 MD |
2366 | { |
2367 | case (SCM_ISYMNUM (SCM_IM_APPLY)): | |
2f0d1375 | 2368 | ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED); |
6dbd0af5 MD |
2369 | goto loop; |
2370 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
2f0d1375 | 2371 | ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED); |
6dbd0af5 | 2372 | goto loop; |
a570e93a MD |
2373 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
2374 | ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED); | |
2375 | x = SCM_CDR (x); | |
2376 | goto loop; | |
28d52ebb | 2377 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
ebf9b47c | 2378 | ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED); |
28d52ebb MD |
2379 | x = SCM_CDR (x); |
2380 | goto loop; | |
a513ead3 MV |
2381 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
2382 | ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED); | |
2383 | goto loop; | |
2a6f7afe DH |
2384 | case (SCM_ISYMNUM (SCM_IM_ELSE)): |
2385 | ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED); | |
2386 | goto loop; | |
6dbd0af5 | 2387 | default: |
fa888178 | 2388 | /* appease the Sun compiler god: */ ; |
6dbd0af5 | 2389 | } |
6dbd0af5 | 2390 | default: |
6bff1368 | 2391 | ls = z = unmemocar (scm_cons (scm_unmemocopy (SCM_CAR (x), env), |
6dbd0af5 MD |
2392 | SCM_UNSPECIFIED), |
2393 | env); | |
2394 | } | |
2395 | loop: | |
8c494e99 DH |
2396 | x = SCM_CDR (x); |
2397 | while (SCM_CONSP (x)) | |
a23afe53 | 2398 | { |
8c494e99 DH |
2399 | SCM form = SCM_CAR (x); |
2400 | if (!SCM_ISYMP (form)) | |
2401 | { | |
6bff1368 | 2402 | SCM copy = scm_cons (scm_unmemocopy (form, env), SCM_UNSPECIFIED); |
8c494e99 DH |
2403 | SCM_SETCDR (z, unmemocar (copy, env)); |
2404 | z = SCM_CDR (z); | |
2405 | } | |
609a8b86 DH |
2406 | else if (SCM_EQ_P (form, SCM_IM_ARROW)) |
2407 | { | |
2408 | SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED)); | |
2409 | z = SCM_CDR (z); | |
2410 | } | |
8c494e99 | 2411 | x = SCM_CDR (x); |
a23afe53 MD |
2412 | } |
2413 | SCM_SETCDR (z, x); | |
01f11e02 | 2414 | if (!SCM_FALSEP (p)) |
6dbd0af5 | 2415 | scm_whash_insert (scm_source_whash, ls, p); |
6dbd0af5 MD |
2416 | return ls; |
2417 | } | |
2418 | ||
1cc91f1b | 2419 | |
6f81708a DH |
2420 | /*****************************************************************************/ |
2421 | /*****************************************************************************/ | |
2422 | /* The definitions for execution start here. */ | |
2423 | /*****************************************************************************/ | |
2424 | /*****************************************************************************/ | |
2425 | ||
2426 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2427 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2428 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2429 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
2430 | ||
2431 | /* A function object to implement "apply" for non-closure functions. */ | |
2432 | static SCM f_apply; | |
2433 | /* An endless list consisting of #<undefined> objects: */ | |
2434 | static SCM undefineds; | |
2435 | ||
2436 | ||
2437 | int | |
6e8d25a6 | 2438 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2439 | { |
6a0f6ff3 | 2440 | while (!SCM_NULLP (formals)) |
0f2d19dd | 2441 | { |
01f11e02 | 2442 | if (!SCM_CONSP (formals)) |
ff467021 | 2443 | return 0; |
6a0f6ff3 | 2444 | if (SCM_NULLP (args)) |
ff467021 | 2445 | return 1; |
0f2d19dd JB |
2446 | formals = SCM_CDR (formals); |
2447 | args = SCM_CDR (args); | |
2448 | } | |
01f11e02 | 2449 | return !SCM_NULLP (args) ? 1 : 0; |
0f2d19dd | 2450 | } |
a392ee15 | 2451 | |
0f2d19dd | 2452 | \f |
62360b89 DH |
2453 | |
2454 | /* The evaluator contains a plethora of EVAL symbols. | |
2455 | * This is an attempt at explanation. | |
2456 | * | |
2457 | * The following macros should be used in code which is read twice | |
2458 | * (where the choice of evaluator is hard soldered): | |
2459 | * | |
2460 | * SCM_CEVAL is the symbol used within one evaluator to call itself. | |
2461 | * Originally, it is defined to scm_ceval, but is redefined to | |
2462 | * scm_deval during the second pass. | |
2463 | * | |
2464 | * SCM_EVALIM is used when it is known that the expression is an | |
2465 | * immediate. (This macro never calls an evaluator.) | |
2466 | * | |
2467 | * EVALCAR evaluates the car of an expression. | |
2468 | * | |
2469 | * The following macros should be used in code which is read once | |
2470 | * (where the choice of evaluator is dynamic): | |
2471 | * | |
2472 | * SCM_XEVAL takes care of immediates without calling an evaluator. It | |
2473 | * then calls scm_ceval *or* scm_deval, depending on the debugging | |
2474 | * mode. | |
2475 | * | |
2476 | * SCM_XEVALCAR corresponds to EVALCAR, but uses scm_ceval *or* scm_deval | |
2477 | * depending on the debugging mode. | |
2478 | * | |
2479 | * The main motivation for keeping this plethora is efficiency | |
2480 | * together with maintainability (=> locality of code). | |
2481 | */ | |
2482 | ||
2483 | #define SCM_CEVAL scm_ceval | |
2484 | ||
2485 | #define SCM_EVALIM2(x) \ | |
2486 | ((SCM_EQ_P ((x), SCM_EOL) \ | |
2487 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ | |
2488 | : 0), \ | |
2489 | (x)) | |
2490 | ||
2491 | #define SCM_EVALIM(x, env) (SCM_ILOCP (x) \ | |
2492 | ? *scm_ilookup ((x), env) \ | |
2493 | : SCM_EVALIM2(x)) | |
2494 | ||
2495 | #define SCM_XEVAL(x, env) (SCM_IMP (x) \ | |
2496 | ? SCM_EVALIM2(x) \ | |
2497 | : (*scm_ceval_ptr) ((x), (env))) | |
2498 | ||
2499 | #define SCM_XEVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ | |
2500 | ? SCM_EVALIM (SCM_CAR (x), env) \ | |
2501 | : (SCM_SYMBOLP (SCM_CAR (x)) \ | |
2502 | ? *scm_lookupcar (x, env, 1) \ | |
2503 | : (*scm_ceval_ptr) (SCM_CAR (x), env))) | |
2504 | ||
2505 | #define EVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ | |
2506 | ? SCM_EVALIM (SCM_CAR (x), env) \ | |
2507 | : (SCM_SYMBOLP (SCM_CAR (x)) \ | |
2508 | ? *scm_lookupcar (x, env, 1) \ | |
2509 | : SCM_CEVAL (SCM_CAR (x), env))) | |
2510 | ||
2511 | SCM_REC_MUTEX (source_mutex); | |
2512 | ||
2513 | ||
2514 | SCM | |
2515 | scm_eval_car (SCM pair, SCM env) | |
2516 | { | |
2517 | return SCM_XEVALCAR (pair, env); | |
2518 | } | |
2519 | ||
2520 | ||
6dbd0af5 | 2521 | SCM |
6e8d25a6 | 2522 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2523 | { |
680ed4a8 | 2524 | SCM results = SCM_EOL, *lloc = &results, res; |
904a077d | 2525 | while (SCM_CONSP (l)) |
6dbd0af5 | 2526 | { |
680ed4a8 | 2527 | res = EVALCAR (l, env); |
904a077d | 2528 | |
8ea46249 | 2529 | *lloc = scm_list_1 (res); |
a23afe53 | 2530 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2531 | l = SCM_CDR (l); |
2532 | } | |
22a52da1 | 2533 | if (!SCM_NULLP (l)) |
904a077d | 2534 | scm_wrong_num_args (proc); |
680ed4a8 | 2535 | return results; |
6dbd0af5 | 2536 | } |
c4ac4d88 | 2537 | |
d0b07b5d | 2538 | |
9de33deb MD |
2539 | SCM |
2540 | scm_eval_body (SCM code, SCM env) | |
2541 | { | |
2542 | SCM next; | |
2543 | again: | |
01f11e02 DH |
2544 | next = SCM_CDR (code); |
2545 | while (!SCM_NULLP (next)) | |
9de33deb MD |
2546 | { |
2547 | if (SCM_IMP (SCM_CAR (code))) | |
2548 | { | |
2549 | if (SCM_ISYMP (SCM_CAR (code))) | |
2550 | { | |
28d52ebb | 2551 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2552 | /* check for race condition */ |
2553 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2554 | m_expand_body (code, env); |
28d52ebb | 2555 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2556 | goto again; |
2557 | } | |
2558 | } | |
2559 | else | |
2560 | SCM_XEVAL (SCM_CAR (code), env); | |
2561 | code = next; | |
01f11e02 | 2562 | next = SCM_CDR (code); |
9de33deb MD |
2563 | } |
2564 | return SCM_XEVALCAR (code, env); | |
2565 | } | |
2566 | ||
0f2d19dd JB |
2567 | #endif /* !DEVAL */ |
2568 | ||
6dbd0af5 MD |
2569 | |
2570 | /* SECTION: This code is specific for the debugging support. One | |
2571 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2572 | * defined. | |
2573 | */ | |
2574 | ||
2575 | #ifndef DEVAL | |
2576 | ||
2577 | #define SCM_APPLY scm_apply | |
2578 | #define PREP_APPLY(proc, args) | |
2579 | #define ENTER_APPLY | |
ddea3325 | 2580 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2581 | #ifdef STACK_CHECKING |
2582 | #ifndef NO_CEVAL_STACK_CHECKING | |
2583 | #define EVAL_STACK_CHECKING | |
2584 | #endif | |
6dbd0af5 MD |
2585 | #endif |
2586 | ||
2587 | #else /* !DEVAL */ | |
2588 | ||
0f2d19dd JB |
2589 | #undef SCM_CEVAL |
2590 | #define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */ | |
2591 | #undef SCM_APPLY | |
2592 | #define SCM_APPLY scm_dapply | |
6dbd0af5 MD |
2593 | #undef PREP_APPLY |
2594 | #define PREP_APPLY(p, l) \ | |
2595 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
2596 | #undef ENTER_APPLY | |
2597 | #define ENTER_APPLY \ | |
d3a6bc94 | 2598 | do { \ |
b7ff98dd | 2599 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2600 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2601 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2602 | {\ |
156dcb09 | 2603 | SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2604 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2605 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2606 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2607 | {\ |
c0ab1b8d | 2608 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 2609 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 2610 | }\ |
6dbd0af5 MD |
2611 | else\ |
2612 | {\ | |
5f144b10 GH |
2613 | int first;\ |
2614 | tmp = scm_make_continuation (&first);\ | |
2615 | if (first)\ | |
d95c0b76 | 2616 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 2617 | }\ |
d95c0b76 | 2618 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 2619 | }\ |
d3a6bc94 | 2620 | } while (0) |
0f2d19dd | 2621 | #undef RETURN |
ddea3325 | 2622 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
b7ff98dd MD |
2623 | #ifdef STACK_CHECKING |
2624 | #ifndef EVAL_STACK_CHECKING | |
2625 | #define EVAL_STACK_CHECKING | |
2626 | #endif | |
6dbd0af5 MD |
2627 | #endif |
2628 | ||
2629 | /* scm_ceval_ptr points to the currently selected evaluator. | |
2630 | * *fixme*: Although efficiency is important here, this state variable | |
2631 | * should probably not be a global. It should be related to the | |
2632 | * current repl. | |
2633 | */ | |
2634 | ||
1cc91f1b | 2635 | |
1bbd0b84 | 2636 | SCM (*scm_ceval_ptr) (SCM x, SCM env); |
0f2d19dd | 2637 | |
1646d37b | 2638 | /* scm_last_debug_frame contains a pointer to the last debugging |
6dbd0af5 MD |
2639 | * information stack frame. It is accessed very often from the |
2640 | * debugging evaluator, so it should probably not be indirectly | |
2641 | * addressed. Better to save and restore it from the current root at | |
2642 | * any stack swaps. | |
2643 | */ | |
2644 | ||
6dbd0af5 MD |
2645 | /* scm_debug_eframe_size is the number of slots available for pseudo |
2646 | * stack frames at each real stack frame. | |
2647 | */ | |
2648 | ||
c014a02e | 2649 | long scm_debug_eframe_size; |
6dbd0af5 | 2650 | |
b7ff98dd | 2651 | int scm_debug_mode, scm_check_entry_p, scm_check_apply_p, scm_check_exit_p; |
6dbd0af5 | 2652 | |
c014a02e | 2653 | long scm_eval_stack; |
a74145b8 | 2654 | |
92c2555f | 2655 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 2656 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
2657 | }; |
2658 | ||
92c2555f | 2659 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
2660 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
2661 | "*Flyweight representation of the stack at traps." }, | |
2662 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
2663 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
2664 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
2665 | "Record procedure names at definition." }, | |
2666 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
2667 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 2668 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
2669 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
2670 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 2671 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
2672 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
2673 | "Maximal number of stored backtrace frames." }, | |
2674 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
2675 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
2676 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 2677 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 2678 | { 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 |
2679 | }; |
2680 | ||
92c2555f | 2681 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 2682 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
2683 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
2684 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
2685 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
2686 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
2687 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
2688 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
2689 | }; |
2690 | ||
a1ec6916 | 2691 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 2692 | (SCM setting), |
b3f26b14 MG |
2693 | "Option interface for the evaluation options. Instead of using\n" |
2694 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 2695 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 2696 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
2697 | { |
2698 | SCM ans; | |
2699 | SCM_DEFER_INTS; | |
2700 | ans = scm_options (setting, | |
2701 | scm_eval_opts, | |
2702 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 2703 | FUNC_NAME); |
a74145b8 | 2704 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
2705 | SCM_ALLOW_INTS; |
2706 | return ans; | |
2707 | } | |
1bbd0b84 | 2708 | #undef FUNC_NAME |
33b97402 | 2709 | |
d0b07b5d | 2710 | |
a1ec6916 | 2711 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 2712 | (SCM setting), |
b3f26b14 | 2713 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 2714 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
2715 | { |
2716 | SCM ans; | |
2717 | SCM_DEFER_INTS; | |
2718 | ans = scm_options (setting, | |
2719 | scm_evaluator_trap_table, | |
2720 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 2721 | FUNC_NAME); |
33b97402 | 2722 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 2723 | SCM_ALLOW_INTS; |
33b97402 MD |
2724 | return ans; |
2725 | } | |
1bbd0b84 | 2726 | #undef FUNC_NAME |
33b97402 | 2727 | |
d0b07b5d | 2728 | |
24933780 | 2729 | static SCM |
a392ee15 | 2730 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 2731 | { |
680ed4a8 | 2732 | SCM *results = lloc, res; |
904a077d | 2733 | while (SCM_CONSP (l)) |
0f2d19dd | 2734 | { |
680ed4a8 | 2735 | res = EVALCAR (l, env); |
904a077d | 2736 | |
8ea46249 | 2737 | *lloc = scm_list_1 (res); |
a23afe53 | 2738 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
2739 | l = SCM_CDR (l); |
2740 | } | |
22a52da1 | 2741 | if (!SCM_NULLP (l)) |
904a077d | 2742 | scm_wrong_num_args (proc); |
680ed4a8 | 2743 | return *results; |
0f2d19dd JB |
2744 | } |
2745 | ||
6dbd0af5 MD |
2746 | #endif /* !DEVAL */ |
2747 | ||
2748 | ||
a392ee15 | 2749 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
2750 | */ |
2751 | ||
a392ee15 | 2752 | |
d9d39d76 | 2753 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 2754 | * current module. */ |
d9d39d76 MV |
2755 | #define UPDATE_TOPLEVEL_ENV(env) \ |
2756 | do { \ | |
2757 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 2758 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
2759 | env = scm_top_level_env (p); \ |
2760 | } while (0) | |
2761 | ||
6dbd0af5 | 2762 | |
6f81708a DH |
2763 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
2764 | ASSERT_SYNTAX (!SCM_EQ_P ((x), SCM_EOL), s_empty_combination, x) | |
2765 | ||
2766 | ||
a392ee15 DH |
2767 | /* This is the evaluator. Like any real monster, it has three heads: |
2768 | * | |
2769 | * scm_ceval is the non-debugging evaluator, scm_deval is the debugging | |
2770 | * version. Both are implemented using a common code base, using the | |
2771 | * following mechanism: SCM_CEVAL is a macro, which is either defined to | |
2772 | * scm_ceval or scm_deval. Thus, there is no function SCM_CEVAL, but the code | |
2773 | * for SCM_CEVAL actually compiles to either scm_ceval or scm_deval. When | |
2774 | * SCM_CEVAL is defined to scm_ceval, it is known that the macro DEVAL is not | |
2775 | * defined. When SCM_CEVAL is defined to scm_deval, then the macro DEVAL is | |
2776 | * known to be defined. Thus, in SCM_CEVAL parts for the debugging evaluator | |
2777 | * are enclosed within #ifdef DEVAL ... #endif. | |
2778 | * | |
2779 | * All three (scm_ceval, scm_deval and their common implementation SCM_CEVAL) | |
2780 | * take two input parameters, x and env: x is a single expression to be | |
2781 | * evalutated. env is the environment in which bindings are searched. | |
2782 | * | |
2783 | * x is known to be a cell (i. e. a pair or any other non-immediate). Since x | |
2784 | * is a single expression, it is necessarily in a tail position. If x is just | |
2785 | * a call to another function like in the expression (foo exp1 exp2 ...), the | |
2786 | * realization of that call therefore _must_not_ increase stack usage (the | |
2787 | * evaluation of exp1, exp2 etc., however, may do so). This is realized by | |
2788 | * making extensive use of 'goto' statements within the evaluator: The gotos | |
2789 | * replace recursive calls to SCM_CEVAL, thus re-using the same stack frame | |
2790 | * that SCM_CEVAL was already using. If, however, x represents some form that | |
2791 | * requires to evaluate a sequence of expressions like (begin exp1 exp2 ...), | |
2792 | * then recursive calls to SCM_CEVAL are performed for all but the last | |
2793 | * expression of that sequence. */ | |
6dbd0af5 | 2794 | |
0f2d19dd | 2795 | #if 0 |
0f2d19dd | 2796 | SCM |
1bbd0b84 | 2797 | scm_ceval (SCM x, SCM env) |
0f2d19dd JB |
2798 | {} |
2799 | #endif | |
1cc91f1b | 2800 | |
a392ee15 | 2801 | #if 0 |
0f2d19dd | 2802 | SCM |
1bbd0b84 | 2803 | scm_deval (SCM x, SCM env) |
0f2d19dd JB |
2804 | {} |
2805 | #endif | |
2806 | ||
6dbd0af5 | 2807 | SCM |
1bbd0b84 | 2808 | SCM_CEVAL (SCM x, SCM env) |
0f2d19dd | 2809 | { |
42030fb2 | 2810 | SCM proc, arg1; |
6dbd0af5 | 2811 | #ifdef DEVAL |
92c2555f MV |
2812 | scm_t_debug_frame debug; |
2813 | scm_t_debug_info *debug_info_end; | |
1646d37b | 2814 | debug.prev = scm_last_debug_frame; |
020c890c | 2815 | debug.status = 0; |
04b6c081 | 2816 | /* |
92c2555f | 2817 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
2818 | * user has specified with (debug-set! frames <n>). |
2819 | * | |
2820 | * Even frames are eval frames, odd frames are apply frames. | |
2821 | */ | |
92c2555f | 2822 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 2823 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
2824 | debug.info = debug.vect; |
2825 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
2826 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 2827 | #endif |
b7ff98dd | 2828 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 2829 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 2830 | { |
b7ff98dd | 2831 | #ifdef DEVAL |
6dbd0af5 MD |
2832 | debug.info->e.exp = x; |
2833 | debug.info->e.env = env; | |
b7ff98dd | 2834 | #endif |
6dbd0af5 MD |
2835 | scm_report_stack_overflow (); |
2836 | } | |
2837 | #endif | |
6a0f6ff3 | 2838 | |
6dbd0af5 MD |
2839 | #ifdef DEVAL |
2840 | goto start; | |
2841 | #endif | |
6a0f6ff3 | 2842 | |
6dbd0af5 MD |
2843 | loop: |
2844 | #ifdef DEVAL | |
b7ff98dd MD |
2845 | SCM_CLEAR_ARGSREADY (debug); |
2846 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 2847 | --debug.info; |
04b6c081 MD |
2848 | /* |
2849 | * In theory, this should be the only place where it is necessary to | |
2850 | * check for space in debug.vect since both eval frames and | |
2851 | * available space are even. | |
2852 | * | |
2853 | * For this to be the case, however, it is necessary that primitive | |
2854 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 2855 | * label call PREP_APPLY. |
04b6c081 | 2856 | */ |
c0ab1b8d | 2857 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 2858 | { |
b7ff98dd | 2859 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
2860 | debug.info -= 2; |
2861 | } | |
6a0f6ff3 | 2862 | |
6dbd0af5 MD |
2863 | start: |
2864 | debug.info->e.exp = x; | |
2865 | debug.info->e.env = env; | |
5132eef0 DH |
2866 | if (scm_check_entry_p && SCM_TRAPS_P) |
2867 | { | |
bc76d628 DH |
2868 | if (SCM_ENTER_FRAME_P |
2869 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 2870 | { |
bc76d628 DH |
2871 | SCM stackrep; |
2872 | SCM tail = SCM_BOOL (SCM_TAILRECP (debug)); | |
5132eef0 DH |
2873 | SCM_SET_TAILREC (debug); |
2874 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 2875 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
2876 | else |
2877 | { | |
2878 | int first; | |
2879 | SCM val = scm_make_continuation (&first); | |
2880 | ||
2881 | if (first) | |
bc76d628 | 2882 | stackrep = val; |
5132eef0 DH |
2883 | else |
2884 | { | |
2885 | x = val; | |
2886 | if (SCM_IMP (x)) | |
2887 | RETURN (x); | |
2888 | else | |
2889 | /* This gives the possibility for the debugger to | |
2890 | modify the source expression before evaluation. */ | |
2891 | goto dispatch; | |
2892 | } | |
2893 | } | |
2894 | SCM_TRAPS_P = 0; | |
2895 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
2896 | scm_sym_enter_frame, | |
bc76d628 | 2897 | stackrep, |
5132eef0 DH |
2898 | tail, |
2899 | scm_unmemocopy (x, env)); | |
2900 | SCM_TRAPS_P = 1; | |
2901 | } | |
2902 | } | |
6dbd0af5 | 2903 | #endif |
f8769b1d | 2904 | dispatch: |
9cb5124f | 2905 | SCM_TICK; |
0f2d19dd JB |
2906 | switch (SCM_TYP7 (x)) |
2907 | { | |
1b43d24c | 2908 | case SCM_BIT7 (SCM_IM_AND): |
0f2d19dd | 2909 | x = SCM_CDR (x); |
302c12b4 DH |
2910 | while (!SCM_NULLP (SCM_CDR (x))) |
2911 | { | |
38ace99e DH |
2912 | SCM test_result = EVALCAR (x, env); |
2913 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
0f2d19dd | 2914 | RETURN (SCM_BOOL_F); |
302c12b4 DH |
2915 | else |
2916 | x = SCM_CDR (x); | |
2917 | } | |
6dbd0af5 | 2918 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2919 | goto carloop; |
2920 | ||
1b43d24c | 2921 | case SCM_BIT7 (SCM_IM_BEGIN): |
e050d4f8 DH |
2922 | x = SCM_CDR (x); |
2923 | if (SCM_NULLP (x)) | |
b8113bc8 MV |
2924 | RETURN (SCM_UNSPECIFIED); |
2925 | ||
6dbd0af5 | 2926 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2927 | |
2928 | begin: | |
4163eb72 MV |
2929 | /* If we are on toplevel with a lookup closure, we need to sync |
2930 | with the current module. */ | |
22a52da1 | 2931 | if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env))) |
4163eb72 | 2932 | { |
d9d39d76 | 2933 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2934 | while (!SCM_NULLP (SCM_CDR (x))) |
4163eb72 | 2935 | { |
5280aaca | 2936 | EVALCAR (x, env); |
d9d39d76 | 2937 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2938 | x = SCM_CDR (x); |
4163eb72 | 2939 | } |
5280aaca | 2940 | goto carloop; |
4163eb72 MV |
2941 | } |
2942 | else | |
5280aaca MV |
2943 | goto nontoplevel_begin; |
2944 | ||
5280aaca | 2945 | nontoplevel_begin: |
302c12b4 | 2946 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 2947 | { |
6a0f6ff3 DH |
2948 | SCM form = SCM_CAR (x); |
2949 | if (SCM_IMP (form)) | |
26d5b9b4 | 2950 | { |
6a0f6ff3 | 2951 | if (SCM_ISYMP (form)) |
26d5b9b4 | 2952 | { |
28d52ebb | 2953 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2954 | /* check for race condition */ |
2955 | if (SCM_ISYMP (SCM_CAR (x))) | |
9d4bf6d3 | 2956 | m_expand_body (x, env); |
28d52ebb | 2957 | scm_rec_mutex_unlock (&source_mutex); |
5280aaca | 2958 | goto nontoplevel_begin; |
26d5b9b4 | 2959 | } |
4163eb72 | 2960 | else |
6a0f6ff3 | 2961 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); |
26d5b9b4 | 2962 | } |
5280aaca | 2963 | else |
6a0f6ff3 | 2964 | SCM_CEVAL (form, env); |
302c12b4 | 2965 | x = SCM_CDR (x); |
0f2d19dd | 2966 | } |
5280aaca | 2967 | |
6a0f6ff3 DH |
2968 | carloop: |
2969 | { | |
2970 | /* scm_eval last form in list */ | |
2971 | SCM last_form = SCM_CAR (x); | |
0f2d19dd | 2972 | |
6a0f6ff3 DH |
2973 | if (SCM_CONSP (last_form)) |
2974 | { | |
2975 | /* This is by far the most frequent case. */ | |
2976 | x = last_form; | |
2977 | goto loop; /* tail recurse */ | |
2978 | } | |
2979 | else if (SCM_IMP (last_form)) | |
2980 | RETURN (SCM_EVALIM (last_form, env)); | |
2981 | else if (SCM_VARIABLEP (last_form)) | |
2982 | RETURN (SCM_VARIABLE_REF (last_form)); | |
2983 | else if (SCM_SYMBOLP (last_form)) | |
2984 | RETURN (*scm_lookupcar (x, env, 1)); | |
2985 | else | |
2986 | RETURN (last_form); | |
2987 | } | |
0f2d19dd JB |
2988 | |
2989 | ||
1b43d24c | 2990 | case SCM_BIT7 (SCM_IM_CASE): |
0f2d19dd | 2991 | x = SCM_CDR (x); |
6a0f6ff3 DH |
2992 | { |
2993 | SCM key = EVALCAR (x, env); | |
2994 | x = SCM_CDR (x); | |
2995 | while (!SCM_NULLP (x)) | |
2996 | { | |
2997 | SCM clause = SCM_CAR (x); | |
2998 | SCM labels = SCM_CAR (clause); | |
2a6f7afe | 2999 | if (SCM_EQ_P (labels, SCM_IM_ELSE)) |
6a0f6ff3 DH |
3000 | { |
3001 | x = SCM_CDR (clause); | |
3002 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3003 | goto begin; | |
3004 | } | |
3005 | while (!SCM_NULLP (labels)) | |
3006 | { | |
3007 | SCM label = SCM_CAR (labels); | |
3008 | if (SCM_EQ_P (label, key) || !SCM_FALSEP (scm_eqv_p (label, key))) | |
3009 | { | |
3010 | x = SCM_CDR (clause); | |
3011 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3012 | goto begin; | |
3013 | } | |
3014 | labels = SCM_CDR (labels); | |
3015 | } | |
3016 | x = SCM_CDR (x); | |
3017 | } | |
3018 | } | |
ddea3325 | 3019 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3020 | |
3021 | ||
1b43d24c | 3022 | case SCM_BIT7 (SCM_IM_COND): |
8ea46249 DH |
3023 | x = SCM_CDR (x); |
3024 | while (!SCM_NULLP (x)) | |
0f2d19dd | 3025 | { |
e5cb71a0 | 3026 | SCM clause = SCM_CAR (x); |
609a8b86 | 3027 | if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE)) |
8ea46249 | 3028 | { |
e5cb71a0 | 3029 | x = SCM_CDR (clause); |
8ea46249 DH |
3030 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3031 | goto begin; | |
3032 | } | |
e5cb71a0 | 3033 | else |
0f2d19dd | 3034 | { |
dff98306 DH |
3035 | arg1 = EVALCAR (clause, env); |
3036 | if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1)) | |
6dbd0af5 | 3037 | { |
e5cb71a0 DH |
3038 | x = SCM_CDR (clause); |
3039 | if (SCM_NULLP (x)) | |
dff98306 | 3040 | RETURN (arg1); |
609a8b86 | 3041 | else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW)) |
e5cb71a0 DH |
3042 | { |
3043 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3044 | goto begin; | |
3045 | } | |
3046 | else | |
3047 | { | |
3048 | proc = SCM_CDR (x); | |
3049 | proc = EVALCAR (proc, env); | |
dff98306 | 3050 | PREP_APPLY (proc, scm_list_1 (arg1)); |
e5cb71a0 | 3051 | ENTER_APPLY; |
ddd8f927 | 3052 | goto evap1; |
e5cb71a0 | 3053 | } |
6dbd0af5 | 3054 | } |
e5cb71a0 | 3055 | x = SCM_CDR (x); |
0f2d19dd JB |
3056 | } |
3057 | } | |
ddea3325 | 3058 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3059 | |
3060 | ||
1b43d24c | 3061 | case SCM_BIT7 (SCM_IM_DO): |
0f2d19dd | 3062 | x = SCM_CDR (x); |
e5cb71a0 DH |
3063 | { |
3064 | /* Compute the initialization values and the initial environment. */ | |
e681d187 | 3065 | SCM init_forms = SCM_CAR (x); |
e5cb71a0 DH |
3066 | SCM init_values = SCM_EOL; |
3067 | while (!SCM_NULLP (init_forms)) | |
3068 | { | |
3069 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3070 | init_forms = SCM_CDR (init_forms); | |
3071 | } | |
e681d187 | 3072 | x = SCM_CDR (x); |
821f18a4 | 3073 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
e5cb71a0 | 3074 | } |
e681d187 | 3075 | x = SCM_CDR (x); |
e5cb71a0 DH |
3076 | { |
3077 | SCM test_form = SCM_CAR (x); | |
3078 | SCM body_forms = SCM_CADR (x); | |
3079 | SCM step_forms = SCM_CDDR (x); | |
3080 | ||
3081 | SCM test_result = EVALCAR (test_form, env); | |
3082 | ||
3083 | while (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
3084 | { | |
0f2d19dd | 3085 | { |
e5cb71a0 DH |
3086 | /* Evaluate body forms. */ |
3087 | SCM temp_forms; | |
3088 | for (temp_forms = body_forms; | |
3089 | !SCM_NULLP (temp_forms); | |
3090 | temp_forms = SCM_CDR (temp_forms)) | |
3091 | { | |
3092 | SCM form = SCM_CAR (temp_forms); | |
3093 | /* Dirk:FIXME: We only need to eval forms, that may have a | |
3094 | * side effect here. This is only true for forms that start | |
3095 | * with a pair. All others are just constants. However, | |
3096 | * since in the common case there is no constant expression | |
3097 | * in a body of a do form, we just check for immediates here | |
3098 | * and have SCM_CEVAL take care of other cases. In the long | |
3099 | * run it would make sense to get rid of this test and have | |
3100 | * the macro transformer of 'do' eliminate all forms that | |
3101 | * have no sideeffect. */ | |
3102 | if (!SCM_IMP (form)) | |
3103 | SCM_CEVAL (form, env); | |
3104 | } | |
0f2d19dd | 3105 | } |
e5cb71a0 DH |
3106 | |
3107 | { | |
3108 | /* Evaluate the step expressions. */ | |
3109 | SCM temp_forms; | |
3110 | SCM step_values = SCM_EOL; | |
3111 | for (temp_forms = step_forms; | |
3112 | !SCM_NULLP (temp_forms); | |
3113 | temp_forms = SCM_CDR (temp_forms)) | |
3114 | { | |
3115 | SCM value = EVALCAR (temp_forms, env); | |
3116 | step_values = scm_cons (value, step_values); | |
3117 | } | |
821f18a4 DH |
3118 | env = SCM_EXTEND_ENV (SCM_CAAR (env), |
3119 | step_values, | |
3120 | SCM_CDR (env)); | |
e5cb71a0 DH |
3121 | } |
3122 | ||
3123 | test_result = EVALCAR (test_form, env); | |
3124 | } | |
3125 | } | |
3126 | x = SCM_CDAR (x); | |
0f2d19dd | 3127 | if (SCM_NULLP (x)) |
6dbd0af5 MD |
3128 | RETURN (SCM_UNSPECIFIED); |
3129 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
5280aaca | 3130 | goto nontoplevel_begin; |
0f2d19dd JB |
3131 | |
3132 | ||
1b43d24c | 3133 | case SCM_BIT7 (SCM_IM_IF): |
0f2d19dd | 3134 | x = SCM_CDR (x); |
38ace99e DH |
3135 | { |
3136 | SCM test_result = EVALCAR (x, env); | |
4610b011 DH |
3137 | x = SCM_CDR (x); /* then expression */ |
3138 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
38ace99e | 3139 | { |
4610b011 | 3140 | x = SCM_CDR (x); /* else expression */ |
38ace99e DH |
3141 | if (SCM_NULLP (x)) |
3142 | RETURN (SCM_UNSPECIFIED); | |
3143 | } | |
3144 | } | |
6dbd0af5 | 3145 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3146 | goto carloop; |
3147 | ||
3148 | ||
1b43d24c | 3149 | case SCM_BIT7 (SCM_IM_LET): |
0f2d19dd | 3150 | x = SCM_CDR (x); |
38ace99e DH |
3151 | { |
3152 | SCM init_forms = SCM_CADR (x); | |
3153 | SCM init_values = SCM_EOL; | |
3154 | do | |
3155 | { | |
3156 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3157 | init_forms = SCM_CDR (init_forms); | |
3158 | } | |
3159 | while (!SCM_NULLP (init_forms)); | |
821f18a4 | 3160 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
38ace99e | 3161 | } |
e050d4f8 DH |
3162 | x = SCM_CDDR (x); |
3163 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3164 | goto nontoplevel_begin; | |
0f2d19dd JB |
3165 | |
3166 | ||
1b43d24c | 3167 | case SCM_BIT7 (SCM_IM_LETREC): |
0f2d19dd | 3168 | x = SCM_CDR (x); |
821f18a4 | 3169 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); |
0f2d19dd | 3170 | x = SCM_CDR (x); |
38ace99e DH |
3171 | { |
3172 | SCM init_forms = SCM_CAR (x); | |
3173 | SCM init_values = SCM_EOL; | |
3174 | do | |
3175 | { | |
3176 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3177 | init_forms = SCM_CDR (init_forms); | |
3178 | } | |
3179 | while (!SCM_NULLP (init_forms)); | |
3180 | SCM_SETCDR (SCM_CAR (env), init_values); | |
3181 | } | |
e050d4f8 DH |
3182 | x = SCM_CDR (x); |
3183 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3184 | goto nontoplevel_begin; | |
0f2d19dd JB |
3185 | |
3186 | ||
1b43d24c | 3187 | case SCM_BIT7 (SCM_IM_LETSTAR): |
0f2d19dd | 3188 | x = SCM_CDR (x); |
302c12b4 DH |
3189 | { |
3190 | SCM bindings = SCM_CAR (x); | |
3191 | if (SCM_NULLP (bindings)) | |
821f18a4 | 3192 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
302c12b4 DH |
3193 | else |
3194 | { | |
3195 | do | |
3196 | { | |
3197 | SCM name = SCM_CAR (bindings); | |
3198 | SCM init = SCM_CDR (bindings); | |
821f18a4 | 3199 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); |
302c12b4 DH |
3200 | bindings = SCM_CDR (init); |
3201 | } | |
3202 | while (!SCM_NULLP (bindings)); | |
3203 | } | |
3204 | } | |
e050d4f8 DH |
3205 | x = SCM_CDR (x); |
3206 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3207 | goto nontoplevel_begin; | |
0f2d19dd | 3208 | |
302c12b4 | 3209 | |
1b43d24c | 3210 | case SCM_BIT7 (SCM_IM_OR): |
0f2d19dd | 3211 | x = SCM_CDR (x); |
302c12b4 | 3212 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 3213 | { |
302c12b4 | 3214 | SCM val = EVALCAR (x, env); |
c96d76b8 | 3215 | if (!SCM_FALSEP (val) && !SCM_NILP (val)) |
302c12b4 DH |
3216 | RETURN (val); |
3217 | else | |
3218 | x = SCM_CDR (x); | |
0f2d19dd | 3219 | } |
6dbd0af5 | 3220 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3221 | goto carloop; |
3222 | ||
3223 | ||
1b43d24c | 3224 | case SCM_BIT7 (SCM_IM_LAMBDA): |
0f2d19dd JB |
3225 | RETURN (scm_closure (SCM_CDR (x), env)); |
3226 | ||
3227 | ||
1b43d24c | 3228 | case SCM_BIT7 (SCM_IM_QUOTE): |
8ea46249 | 3229 | RETURN (SCM_CADR (x)); |
0f2d19dd JB |
3230 | |
3231 | ||
1b43d24c | 3232 | case SCM_BIT7 (SCM_IM_SET_X): |
0f2d19dd | 3233 | x = SCM_CDR (x); |
38ace99e DH |
3234 | { |
3235 | SCM *location; | |
3236 | SCM variable = SCM_CAR (x); | |
e050d4f8 | 3237 | if (SCM_ILOCP (variable)) |
38ace99e | 3238 | location = scm_ilookup (variable, env); |
3063e30a | 3239 | else if (SCM_VARIABLEP (variable)) |
e050d4f8 | 3240 | location = SCM_VARIABLE_LOC (variable); |
38ace99e DH |
3241 | else /* (SCM_SYMBOLP (variable)) is known to be true */ |
3242 | location = scm_lookupcar (x, env, 1); | |
3243 | x = SCM_CDR (x); | |
3244 | *location = EVALCAR (x, env); | |
3245 | } | |
0f2d19dd | 3246 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3247 | |
3248 | ||
0f2d19dd | 3249 | /* new syntactic forms go here. */ |
1b43d24c | 3250 | case SCM_BIT7 (SCM_MAKISYM (0)): |
0f2d19dd | 3251 | proc = SCM_CAR (x); |
a392ee15 | 3252 | switch (SCM_ISYMNUM (proc)) |
0f2d19dd | 3253 | { |
3f04400d DH |
3254 | |
3255 | ||
0f2d19dd | 3256 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3257 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3258 | x = SCM_CDR (x); |
3259 | proc = EVALCAR (x, env); | |
3260 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3261 | |
3262 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3263 | x = SCM_CDR (x); |
3264 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3265 | |
3266 | apply_proc: | |
3267 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3268 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3269 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3270 | if (SCM_CLOSUREP (proc)) |
3271 | { | |
9a069bdd | 3272 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3273 | #ifdef DEVAL |
9a069bdd | 3274 | debug.info->a.args = arg1; |
6dbd0af5 | 3275 | #endif |
9a069bdd DH |
3276 | if (scm_badargsp (formals, arg1)) |
3277 | scm_wrong_num_args (proc); | |
3278 | ENTER_APPLY; | |
3279 | /* Copy argument list */ | |
3280 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3281 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3282 | else | |
3283 | { | |
3284 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3285 | SCM tail = args; | |
3286 | arg1 = SCM_CDR (arg1); | |
3287 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3288 | { | |
3289 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3290 | SCM_SETCDR (tail, new_tail); | |
3291 | tail = new_tail; | |
3292 | arg1 = SCM_CDR (arg1); | |
3293 | } | |
3294 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3295 | } | |
3296 | ||
3297 | x = SCM_CLOSURE_BODY (proc); | |
3298 | goto nontoplevel_begin; | |
0f2d19dd | 3299 | } |
3f04400d DH |
3300 | else |
3301 | { | |
e910e9d2 DH |
3302 | ENTER_APPLY; |
3303 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3304 | } |
3305 | ||
0f2d19dd JB |
3306 | |
3307 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
5f144b10 GH |
3308 | { |
3309 | int first; | |
3310 | SCM val = scm_make_continuation (&first); | |
3311 | ||
e050d4f8 | 3312 | if (!first) |
5f144b10 | 3313 | RETURN (val); |
e050d4f8 DH |
3314 | else |
3315 | { | |
3316 | arg1 = val; | |
3317 | proc = SCM_CDR (x); | |
6bff1368 | 3318 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3319 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3320 | ENTER_APPLY; | |
e050d4f8 DH |
3321 | goto evap1; |
3322 | } | |
5f144b10 | 3323 | } |
e050d4f8 | 3324 | |
0f2d19dd | 3325 | |
a570e93a | 3326 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3327 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3328 | |
e050d4f8 | 3329 | |
28d52ebb MD |
3330 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
3331 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); | |
3332 | ||
3333 | ||
c8e1d354 MD |
3334 | /* PLACEHOLDER for case (SCM_ISYMNUM (SCM_IM_DISPATCH)): The |
3335 | following code (type_dispatch) is intended to be the tail | |
3336 | of the case clause for the internal macro | |
3337 | SCM_IM_DISPATCH. Please don't remove it from this | |
3338 | location without discussing it with Mikael | |
3339 | <djurfeldt@nada.kth.se> */ | |
3340 | ||
f12745b6 DH |
3341 | /* The type dispatch code is duplicated below |
3342 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3343 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3344 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3345 | /* Type dispatch means to determine from the types of the function |
3346 | * arguments (i. e. the 'signature' of the call), which method from | |
3347 | * a generic function is to be called. This process of selecting | |
3348 | * the right method takes some time. To speed it up, guile uses | |
3349 | * caching: Together with the macro call to dispatch the signatures | |
3350 | * of some previous calls to that generic function from the same | |
3351 | * place are stored (in the code!) in a cache that we call the | |
3352 | * 'method cache'. This is done since it is likely, that | |
3353 | * consecutive calls to dispatch from that position in the code will | |
3354 | * have the same signature. Thus, the type dispatch works as | |
3355 | * follows: First, determine a hash value from the signature of the | |
3356 | * actual arguments. Second, use this hash value as an index to | |
3357 | * find that same signature in the method cache stored at this | |
3358 | * position in the code. If found, you have also found the | |
3359 | * corresponding method that belongs to that signature. If the | |
3360 | * signature is not found in the method cache, you have to perform a | |
3361 | * full search over all signatures stored with the generic | |
3362 | * function. */ | |
3363 | { | |
3364 | unsigned long int specializers; | |
3365 | unsigned long int hash_value; | |
3366 | unsigned long int cache_end_pos; | |
3367 | unsigned long int mask; | |
3368 | SCM method_cache; | |
3369 | ||
3370 | { | |
3371 | SCM z = SCM_CDDR (x); | |
3372 | SCM tmp = SCM_CADR (z); | |
3373 | specializers = SCM_INUM (SCM_CAR (z)); | |
3374 | ||
3375 | /* Compute a hash value for searching the method cache. There | |
3376 | * are two variants for computing the hash value, a (rather) | |
3377 | * complicated one, and a simple one. For the complicated one | |
3378 | * explained below, tmp holds a number that is used in the | |
3379 | * computation. */ | |
3380 | if (SCM_INUMP (tmp)) | |
3381 | { | |
3382 | /* Use the signature of the actual arguments to determine | |
3383 | * the hash value. This is done as follows: Each class has | |
3384 | * an array of random numbers, that are determined when the | |
3385 | * class is created. The integer 'hashset' is an index into | |
3386 | * that array of random numbers. Now, from all classes that | |
3387 | * are part of the signature of the actual arguments, the | |
3388 | * random numbers at index 'hashset' are taken and summed | |
3389 | * up, giving the hash value. The value of 'hashset' is | |
3390 | * stored at the call to dispatch. This allows to have | |
3391 | * different 'formulas' for calculating the hash value at | |
3392 | * different places where dispatch is called. This allows | |
3393 | * to optimize the hash formula at every individual place | |
3394 | * where dispatch is called, such that hopefully the hash | |
3395 | * value that is computed will directly point to the right | |
3396 | * method in the method cache. */ | |
3397 | unsigned long int hashset = SCM_INUM (tmp); | |
3398 | unsigned long int counter = specializers + 1; | |
dff98306 | 3399 | SCM tmp_arg = arg1; |
f12745b6 DH |
3400 | hash_value = 0; |
3401 | while (!SCM_NULLP (tmp_arg) && counter != 0) | |
61364ba6 | 3402 | { |
f12745b6 DH |
3403 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3404 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3405 | tmp_arg = SCM_CDR (tmp_arg); | |
3406 | counter--; | |
61364ba6 | 3407 | } |
f12745b6 DH |
3408 | z = SCM_CDDR (z); |
3409 | method_cache = SCM_CADR (z); | |
3410 | mask = SCM_INUM (SCM_CAR (z)); | |
3411 | hash_value &= mask; | |
3412 | cache_end_pos = hash_value; | |
3413 | } | |
3414 | else | |
3415 | { | |
3416 | /* This method of determining the hash value is much | |
3417 | * simpler: Set the hash value to zero and just perform a | |
3418 | * linear search through the method cache. */ | |
3419 | method_cache = tmp; | |
3420 | mask = (unsigned long int) ((long) -1); | |
3421 | hash_value = 0; | |
3422 | cache_end_pos = SCM_VECTOR_LENGTH (method_cache); | |
3423 | } | |
3424 | } | |
61364ba6 | 3425 | |
f12745b6 DH |
3426 | { |
3427 | /* Search the method cache for a method with a matching | |
3428 | * signature. Start the search at position 'hash_value'. The | |
3429 | * hashing implementation uses linear probing for conflict | |
3430 | * resolution, that is, if the signature in question is not | |
3431 | * found at the starting index in the hash table, the next table | |
3432 | * entry is tried, and so on, until in the worst case the whole | |
3433 | * cache has been searched, but still the signature has not been | |
3434 | * found. */ | |
3435 | SCM z; | |
3436 | do | |
3437 | { | |
dff98306 | 3438 | SCM args = arg1; /* list of arguments */ |
f12745b6 DH |
3439 | z = SCM_VELTS (method_cache)[hash_value]; |
3440 | while (!SCM_NULLP (args)) | |
61364ba6 MD |
3441 | { |
3442 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 DH |
3443 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
3444 | if (!SCM_EQ_P (class_of_arg, SCM_CAR (z))) | |
61364ba6 | 3445 | goto next_method; |
f12745b6 | 3446 | args = SCM_CDR (args); |
61364ba6 MD |
3447 | z = SCM_CDR (z); |
3448 | } | |
f12745b6 DH |
3449 | /* Fewer arguments than specifiers => CAR != ENV */ |
3450 | if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))) | |
3451 | goto apply_cmethod; | |
3452 | next_method: | |
3453 | hash_value = (hash_value + 1) & mask; | |
3454 | } while (hash_value != cache_end_pos); | |
3455 | ||
3456 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3457 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3458 | |
dff98306 | 3459 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3460 | { |
3461 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3462 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3463 | x = SCM_CMETHOD_BODY (z); |
3464 | goto nontoplevel_begin; | |
3465 | } | |
3466 | } | |
61364ba6 | 3467 | } |
73b64342 | 3468 | |
1d15ecd3 | 3469 | |
ca4be6ea MD |
3470 | case (SCM_ISYMNUM (SCM_IM_SLOT_REF)): |
3471 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3472 | { |
3473 | SCM instance = EVALCAR (x, env); | |
3474 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3475 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); | |
3476 | } | |
3477 | ||
3478 | ||
ca4be6ea MD |
3479 | case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X)): |
3480 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3481 | { |
3482 | SCM instance = EVALCAR (x, env); | |
3483 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3484 | SCM value = EVALCAR (SCM_CDDR (x), env); | |
3485 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3486 | RETURN (SCM_UNSPECIFIED); | |
3487 | } | |
3488 | ||
c96d76b8 | 3489 | |
22721140 | 3490 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3491 | |
73b64342 | 3492 | case (SCM_ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3493 | { |
3494 | SCM test_form = SCM_CDR (x); | |
3495 | x = SCM_CDR (test_form); | |
3496 | while (!SCM_NULL_OR_NIL_P (x)) | |
3497 | { | |
3498 | SCM test_result = EVALCAR (test_form, env); | |
3499 | if (!(SCM_FALSEP (test_result) | |
3500 | || SCM_NULL_OR_NIL_P (test_result))) | |
3501 | { | |
3502 | if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED)) | |
3503 | RETURN (test_result); | |
3504 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3505 | goto carloop; | |
3506 | } | |
3507 | else | |
3508 | { | |
3509 | test_form = SCM_CDR (x); | |
3510 | x = SCM_CDR (test_form); | |
3511 | } | |
3512 | } | |
3513 | x = test_form; | |
3514 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3515 | goto carloop; | |
3516 | } | |
73b64342 | 3517 | |
c96d76b8 | 3518 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 MD |
3519 | |
3520 | case (SCM_ISYMNUM (SCM_IM_BIND)): | |
2e171178 MV |
3521 | { |
3522 | SCM vars, exps, vals; | |
73b64342 | 3523 | |
2e171178 MV |
3524 | x = SCM_CDR (x); |
3525 | vars = SCM_CAAR (x); | |
3526 | exps = SCM_CDAR (x); | |
2e171178 | 3527 | vals = SCM_EOL; |
82b3e2c6 | 3528 | while (!SCM_NULLP (exps)) |
2e171178 MV |
3529 | { |
3530 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3531 | exps = SCM_CDR (exps); | |
3532 | } | |
3533 | ||
3534 | scm_swap_bindings (vars, vals); | |
3535 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3536 | |
3537 | /* Ignore all but the last evaluation result. */ | |
3538 | for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x)) | |
2e171178 | 3539 | { |
1d15ecd3 DH |
3540 | if (SCM_CONSP (SCM_CAR (x))) |
3541 | SCM_CEVAL (SCM_CAR (x), env); | |
2e171178 MV |
3542 | } |
3543 | proc = EVALCAR (x, env); | |
73b64342 | 3544 | |
2e171178 MV |
3545 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3546 | scm_swap_bindings (vars, vals); | |
73b64342 | 3547 | |
ddea3325 | 3548 | RETURN (proc); |
2e171178 | 3549 | } |
c96d76b8 | 3550 | |
1d15ecd3 | 3551 | |
a513ead3 MV |
3552 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
3553 | { | |
9a069bdd DH |
3554 | SCM producer; |
3555 | ||
3556 | x = SCM_CDR (x); | |
3557 | producer = EVALCAR (x, env); | |
3558 | x = SCM_CDR (x); | |
3559 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3560 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3561 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3562 | { |
3563 | /* The list of arguments is not copied. Rather, it is assumed | |
3564 | * that this has been done by the 'values' procedure. */ | |
3565 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3566 | } | |
a513ead3 | 3567 | else |
82b3e2c6 DH |
3568 | { |
3569 | arg1 = scm_list_1 (arg1); | |
3570 | } | |
9a069bdd DH |
3571 | PREP_APPLY (proc, arg1); |
3572 | goto apply_proc; | |
a513ead3 MV |
3573 | } |
3574 | ||
b7798e10 | 3575 | |
0f2d19dd | 3576 | default: |
ddd8f927 | 3577 | goto evapply; |
0f2d19dd JB |
3578 | } |
3579 | ||
89bff2fc | 3580 | |
0f2d19dd JB |
3581 | default: |
3582 | proc = x; | |
ddd8f927 | 3583 | goto evapply; |
82b3e2c6 | 3584 | |
89bff2fc | 3585 | |
0f2d19dd JB |
3586 | case scm_tc7_vector: |
3587 | case scm_tc7_wvect: | |
22721140 | 3588 | #if SCM_HAVE_ARRAYS |
0f2d19dd JB |
3589 | case scm_tc7_bvect: |
3590 | case scm_tc7_byvect: | |
3591 | case scm_tc7_svect: | |
3592 | case scm_tc7_ivect: | |
3593 | case scm_tc7_uvect: | |
3594 | case scm_tc7_fvect: | |
3595 | case scm_tc7_dvect: | |
3596 | case scm_tc7_cvect: | |
3d05f2e0 | 3597 | #if SCM_SIZEOF_LONG_LONG != 0 |
0f2d19dd | 3598 | case scm_tc7_llvect: |
afe5177e | 3599 | #endif |
0f2d19dd | 3600 | #endif |
534c55a9 | 3601 | case scm_tc7_number: |
0f2d19dd | 3602 | case scm_tc7_string: |
0f2d19dd JB |
3603 | case scm_tc7_smob: |
3604 | case scm_tcs_closures: | |
224822be | 3605 | case scm_tc7_cclo: |
89efbff4 | 3606 | case scm_tc7_pws: |
0f2d19dd | 3607 | case scm_tcs_subrs: |
904a077d | 3608 | case scm_tcs_struct: |
fc22b297 | 3609 | case scm_tc7_port: |
0f2d19dd JB |
3610 | RETURN (x); |
3611 | ||
89bff2fc DH |
3612 | case scm_tc7_symbol: |
3613 | /* Only happens when called at top level. */ | |
3614 | x = scm_cons (x, SCM_UNDEFINED); | |
3615 | RETURN (*scm_lookupcar (x, env, 1)); | |
3616 | ||
d22a0ea1 | 3617 | case scm_tc7_variable: |
a130e982 | 3618 | RETURN (SCM_VARIABLE_REF(x)); |
d22a0ea1 | 3619 | |
1b43d24c | 3620 | case SCM_BIT7 (SCM_ILOC00): |
0f2d19dd | 3621 | proc = *scm_ilookup (SCM_CAR (x), env); |
ddd8f927 | 3622 | goto checkmacro; |
b7798e10 | 3623 | |
0f2d19dd | 3624 | case scm_tcs_cons_nimcar: |
e050d4f8 | 3625 | if (SCM_SYMBOLP (SCM_CAR (x))) |
0f2d19dd | 3626 | { |
e050d4f8 | 3627 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3628 | { |
3629 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3630 | if (location == NULL) | |
3631 | { | |
3632 | /* we have lost the race, start again. */ | |
3633 | goto dispatch; | |
3634 | } | |
3635 | proc = *location; | |
3636 | } | |
f8769b1d | 3637 | |
22a52da1 | 3638 | if (SCM_MACROP (proc)) |
0f2d19dd | 3639 | { |
86d31dfe MV |
3640 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3641 | lookupcar */ | |
e050d4f8 | 3642 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3643 | #ifdef DEVAL |
7c354052 MD |
3644 | /* Set a flag during macro expansion so that macro |
3645 | application frames can be deleted from the backtrace. */ | |
3646 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3647 | #endif |
dff98306 | 3648 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 3649 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
3650 | #ifdef DEVAL |
3651 | SCM_CLEAR_MACROEXP (debug); | |
3652 | #endif | |
22a52da1 | 3653 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3654 | { |
3b88ed2a | 3655 | case 3: |
0f2d19dd | 3656 | case 2: |
dff98306 DH |
3657 | if (scm_ilength (arg1) <= 0) |
3658 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); | |
6dbd0af5 | 3659 | #ifdef DEVAL |
22a52da1 | 3660 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3661 | { |
6dbd0af5 | 3662 | SCM_DEFER_INTS; |
dff98306 DH |
3663 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3664 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
3665 | SCM_ALLOW_INTS; |
3666 | goto dispatch; | |
3667 | } | |
3668 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
3669 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
3670 | SCM_CAR (x), | |
3671 | SCM_CDR (x)); | |
6dbd0af5 | 3672 | #endif |
0f2d19dd | 3673 | SCM_DEFER_INTS; |
dff98306 DH |
3674 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3675 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 3676 | SCM_ALLOW_INTS; |
680516ba DH |
3677 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3678 | goto loop; | |
3063e30a | 3679 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 3680 | case 1: |
680516ba DH |
3681 | x = arg1; |
3682 | if (SCM_NIMP (x)) | |
3683 | { | |
3684 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3685 | goto loop; | |
3686 | } | |
3687 | else | |
3688 | RETURN (arg1); | |
3063e30a | 3689 | #endif |
0f2d19dd | 3690 | case 0: |
dff98306 | 3691 | RETURN (arg1); |
0f2d19dd JB |
3692 | } |
3693 | } | |
3694 | } | |
3695 | else | |
3696 | proc = SCM_CEVAL (SCM_CAR (x), env); | |
bd987b8e | 3697 | |
ddd8f927 DH |
3698 | checkmacro: |
3699 | if (SCM_MACROP (proc)) | |
0f2d19dd | 3700 | goto handle_a_macro; |
0f2d19dd JB |
3701 | } |
3702 | ||
3703 | ||
e050d4f8 | 3704 | evapply: /* inputs: x, proc */ |
6dbd0af5 MD |
3705 | PREP_APPLY (proc, SCM_EOL); |
3706 | if (SCM_NULLP (SCM_CDR (x))) { | |
3707 | ENTER_APPLY; | |
89efbff4 | 3708 | evap0: |
ddd8f927 | 3709 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
3710 | switch (SCM_TYP7 (proc)) |
3711 | { /* no arguments given */ | |
3712 | case scm_tc7_subr_0: | |
3713 | RETURN (SCM_SUBRF (proc) ()); | |
3714 | case scm_tc7_subr_1o: | |
3715 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
3716 | case scm_tc7_lsubr: | |
3717 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
3718 | case scm_tc7_rpsubr: | |
3719 | RETURN (SCM_BOOL_T); | |
3720 | case scm_tc7_asubr: | |
3721 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 3722 | case scm_tc7_smob: |
68b06924 | 3723 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 3724 | goto badfun; |
68b06924 | 3725 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 3726 | case scm_tc7_cclo: |
dff98306 | 3727 | arg1 = proc; |
0f2d19dd | 3728 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
3729 | #ifdef DEVAL |
3730 | debug.info->a.proc = proc; | |
dff98306 | 3731 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3732 | #endif |
0f2d19dd | 3733 | goto evap1; |
89efbff4 MD |
3734 | case scm_tc7_pws: |
3735 | proc = SCM_PROCEDURE (proc); | |
3736 | #ifdef DEVAL | |
3737 | debug.info->a.proc = proc; | |
3738 | #endif | |
002f1a5d MD |
3739 | if (!SCM_CLOSUREP (proc)) |
3740 | goto evap0; | |
ddd8f927 | 3741 | /* fallthrough */ |
0f2d19dd | 3742 | case scm_tcs_closures: |
ddd8f927 DH |
3743 | { |
3744 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3745 | if (SCM_CONSP (formals)) | |
3746 | goto umwrongnumargs; | |
3747 | x = SCM_CLOSURE_BODY (proc); | |
3748 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3749 | goto nontoplevel_begin; | |
3750 | } | |
904a077d | 3751 | case scm_tcs_struct: |
195847fa MD |
3752 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
3753 | { | |
3754 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 3755 | arg1 = SCM_EOL; |
195847fa MD |
3756 | goto type_dispatch; |
3757 | } | |
2ca0d207 | 3758 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 3759 | { |
dff98306 | 3760 | arg1 = proc; |
195847fa MD |
3761 | proc = (SCM_I_ENTITYP (proc) |
3762 | ? SCM_ENTITY_PROCEDURE (proc) | |
3763 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 3764 | #ifdef DEVAL |
195847fa | 3765 | debug.info->a.proc = proc; |
dff98306 | 3766 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 3767 | #endif |
ddd8f927 | 3768 | goto evap1; |
da7f71d7 | 3769 | } |
2ca0d207 DH |
3770 | else |
3771 | goto badfun; | |
0f2d19dd JB |
3772 | case scm_tc7_subr_1: |
3773 | case scm_tc7_subr_2: | |
3774 | case scm_tc7_subr_2o: | |
14b18ed6 | 3775 | case scm_tc7_dsubr: |
0f2d19dd JB |
3776 | case scm_tc7_cxr: |
3777 | case scm_tc7_subr_3: | |
3778 | case scm_tc7_lsubr_2: | |
3779 | umwrongnumargs: | |
3780 | unmemocar (x, env); | |
f5bf2977 | 3781 | scm_wrong_num_args (proc); |
0f2d19dd | 3782 | default: |
ddd8f927 DH |
3783 | badfun: |
3784 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 3785 | } |
6dbd0af5 | 3786 | } |
0f2d19dd JB |
3787 | |
3788 | /* must handle macros by here */ | |
3789 | x = SCM_CDR (x); | |
dff98306 DH |
3790 | if (SCM_CONSP (x)) |
3791 | arg1 = EVALCAR (x, env); | |
680ed4a8 | 3792 | else |
ab1f1094 | 3793 | scm_wrong_num_args (proc); |
6dbd0af5 | 3794 | #ifdef DEVAL |
dff98306 | 3795 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3796 | #endif |
0f2d19dd | 3797 | x = SCM_CDR (x); |
42030fb2 DH |
3798 | { |
3799 | SCM arg2; | |
3800 | if (SCM_NULLP (x)) | |
3801 | { | |
3802 | ENTER_APPLY; | |
3803 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 3804 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3805 | switch (SCM_TYP7 (proc)) |
3806 | { /* have one argument in arg1 */ | |
3807 | case scm_tc7_subr_2o: | |
3808 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3809 | case scm_tc7_subr_1: | |
3810 | case scm_tc7_subr_1o: | |
3811 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
3812 | case scm_tc7_dsubr: |
3813 | if (SCM_INUMP (arg1)) | |
3814 | { | |
3815 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
3816 | } | |
3817 | else if (SCM_REALP (arg1)) | |
3818 | { | |
3819 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
3820 | } | |
3821 | else if (SCM_BIGP (arg1)) | |
3822 | { | |
3823 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
3824 | } | |
f92e85f7 MV |
3825 | else if (SCM_FRACTIONP (arg1)) |
3826 | { | |
3827 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
3828 | } | |
3829 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
14b18ed6 | 3830 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); |
42030fb2 | 3831 | case scm_tc7_cxr: |
42030fb2 | 3832 | { |
14b18ed6 DH |
3833 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
3834 | do | |
3835 | { | |
3836 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
3837 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
3838 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
3839 | pattern >>= 2; | |
3840 | } while (pattern); | |
42030fb2 | 3841 | RETURN (arg1); |
0f2d19dd | 3842 | } |
42030fb2 DH |
3843 | case scm_tc7_rpsubr: |
3844 | RETURN (SCM_BOOL_T); | |
3845 | case scm_tc7_asubr: | |
3846 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3847 | case scm_tc7_lsubr: | |
0f2d19dd | 3848 | #ifdef DEVAL |
42030fb2 | 3849 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 3850 | #else |
42030fb2 | 3851 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 3852 | #endif |
42030fb2 DH |
3853 | case scm_tc7_smob: |
3854 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3855 | goto badfun; | |
3856 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
3857 | case scm_tc7_cclo: | |
3858 | arg2 = arg1; | |
3859 | arg1 = proc; | |
3860 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 3861 | #ifdef DEVAL |
42030fb2 DH |
3862 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3863 | debug.info->a.proc = proc; | |
6dbd0af5 | 3864 | #endif |
42030fb2 DH |
3865 | goto evap2; |
3866 | case scm_tc7_pws: | |
3867 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 3868 | #ifdef DEVAL |
42030fb2 | 3869 | debug.info->a.proc = proc; |
89efbff4 | 3870 | #endif |
42030fb2 DH |
3871 | if (!SCM_CLOSUREP (proc)) |
3872 | goto evap1; | |
ddd8f927 | 3873 | /* fallthrough */ |
42030fb2 | 3874 | case scm_tcs_closures: |
ddd8f927 DH |
3875 | { |
3876 | /* clos1: */ | |
3877 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3878 | if (SCM_NULLP (formals) | |
3879 | || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals)))) | |
3880 | goto umwrongnumargs; | |
3881 | x = SCM_CLOSURE_BODY (proc); | |
0f2d19dd | 3882 | #ifdef DEVAL |
ddd8f927 DH |
3883 | env = SCM_EXTEND_ENV (formals, |
3884 | debug.info->a.args, | |
3885 | SCM_ENV (proc)); | |
0f2d19dd | 3886 | #else |
ddd8f927 DH |
3887 | env = SCM_EXTEND_ENV (formals, |
3888 | scm_list_1 (arg1), | |
3889 | SCM_ENV (proc)); | |
0f2d19dd | 3890 | #endif |
ddd8f927 DH |
3891 | goto nontoplevel_begin; |
3892 | } | |
42030fb2 DH |
3893 | case scm_tcs_struct: |
3894 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3895 | { | |
3896 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 3897 | #ifdef DEVAL |
42030fb2 | 3898 | arg1 = debug.info->a.args; |
f3d2630a | 3899 | #else |
42030fb2 | 3900 | arg1 = scm_list_1 (arg1); |
f3d2630a | 3901 | #endif |
42030fb2 DH |
3902 | goto type_dispatch; |
3903 | } | |
2ca0d207 | 3904 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3905 | { |
3906 | arg2 = arg1; | |
3907 | arg1 = proc; | |
3908 | proc = (SCM_I_ENTITYP (proc) | |
3909 | ? SCM_ENTITY_PROCEDURE (proc) | |
3910 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 3911 | #ifdef DEVAL |
42030fb2 DH |
3912 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3913 | debug.info->a.proc = proc; | |
0c32d76c | 3914 | #endif |
ddd8f927 | 3915 | goto evap2; |
42030fb2 | 3916 | } |
2ca0d207 DH |
3917 | else |
3918 | goto badfun; | |
42030fb2 DH |
3919 | case scm_tc7_subr_2: |
3920 | case scm_tc7_subr_0: | |
3921 | case scm_tc7_subr_3: | |
3922 | case scm_tc7_lsubr_2: | |
ab1f1094 | 3923 | scm_wrong_num_args (proc); |
42030fb2 DH |
3924 | default: |
3925 | goto badfun; | |
3926 | } | |
3927 | } | |
42030fb2 DH |
3928 | if (SCM_CONSP (x)) |
3929 | arg2 = EVALCAR (x, env); | |
3930 | else | |
ab1f1094 | 3931 | scm_wrong_num_args (proc); |
bd987b8e | 3932 | |
42030fb2 | 3933 | { /* have two or more arguments */ |
6dbd0af5 | 3934 | #ifdef DEVAL |
42030fb2 | 3935 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 3936 | #endif |
42030fb2 DH |
3937 | x = SCM_CDR (x); |
3938 | if (SCM_NULLP (x)) { | |
3939 | ENTER_APPLY; | |
3940 | evap2: | |
ddd8f927 | 3941 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3942 | switch (SCM_TYP7 (proc)) |
3943 | { /* have two arguments */ | |
3944 | case scm_tc7_subr_2: | |
3945 | case scm_tc7_subr_2o: | |
3946 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3947 | case scm_tc7_lsubr: | |
0f2d19dd | 3948 | #ifdef DEVAL |
42030fb2 | 3949 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 3950 | #else |
42030fb2 DH |
3951 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
3952 | #endif | |
3953 | case scm_tc7_lsubr_2: | |
3954 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
3955 | case scm_tc7_rpsubr: | |
3956 | case scm_tc7_asubr: | |
3957 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3958 | case scm_tc7_smob: | |
3959 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3960 | goto badfun; | |
3961 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
3962 | cclon: | |
3963 | case scm_tc7_cclo: | |
0f2d19dd | 3964 | #ifdef DEVAL |
42030fb2 DH |
3965 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3966 | scm_cons (proc, debug.info->a.args), | |
3967 | SCM_EOL)); | |
0f2d19dd | 3968 | #else |
42030fb2 DH |
3969 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3970 | scm_cons2 (proc, arg1, | |
3971 | scm_cons (arg2, | |
3972 | scm_eval_args (x, | |
3973 | env, | |
3974 | proc))), | |
3975 | SCM_EOL)); | |
3976 | #endif | |
3977 | case scm_tcs_struct: | |
3978 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3979 | { | |
3980 | x = SCM_ENTITY_PROCEDURE (proc); | |
3981 | #ifdef DEVAL | |
3982 | arg1 = debug.info->a.args; | |
3983 | #else | |
3984 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 3985 | #endif |
42030fb2 DH |
3986 | goto type_dispatch; |
3987 | } | |
2ca0d207 | 3988 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3989 | { |
3990 | operatorn: | |
f3d2630a | 3991 | #ifdef DEVAL |
42030fb2 DH |
3992 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3993 | ? SCM_ENTITY_PROCEDURE (proc) | |
3994 | : SCM_OPERATOR_PROCEDURE (proc), | |
3995 | scm_cons (proc, debug.info->a.args), | |
3996 | SCM_EOL)); | |
f3d2630a | 3997 | #else |
42030fb2 DH |
3998 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3999 | ? SCM_ENTITY_PROCEDURE (proc) | |
4000 | : SCM_OPERATOR_PROCEDURE (proc), | |
4001 | scm_cons2 (proc, arg1, | |
4002 | scm_cons (arg2, | |
4003 | scm_eval_args (x, | |
4004 | env, | |
4005 | proc))), | |
4006 | SCM_EOL)); | |
f3d2630a | 4007 | #endif |
42030fb2 | 4008 | } |
2ca0d207 DH |
4009 | else |
4010 | goto badfun; | |
42030fb2 | 4011 | case scm_tc7_subr_0: |
14b18ed6 | 4012 | case scm_tc7_dsubr: |
42030fb2 DH |
4013 | case scm_tc7_cxr: |
4014 | case scm_tc7_subr_1o: | |
4015 | case scm_tc7_subr_1: | |
4016 | case scm_tc7_subr_3: | |
ab1f1094 | 4017 | scm_wrong_num_args (proc); |
42030fb2 | 4018 | default: |
9b07e212 | 4019 | goto badfun; |
42030fb2 DH |
4020 | case scm_tc7_pws: |
4021 | proc = SCM_PROCEDURE (proc); | |
4022 | #ifdef DEVAL | |
4023 | debug.info->a.proc = proc; | |
4024 | #endif | |
4025 | if (!SCM_CLOSUREP (proc)) | |
4026 | goto evap2; | |
ddd8f927 | 4027 | /* fallthrough */ |
42030fb2 | 4028 | case scm_tcs_closures: |
ddd8f927 DH |
4029 | { |
4030 | /* clos2: */ | |
4031 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4032 | if (SCM_NULLP (formals) | |
4033 | || (SCM_CONSP (formals) | |
4034 | && (SCM_NULLP (SCM_CDR (formals)) | |
4035 | || (SCM_CONSP (SCM_CDR (formals)) | |
4036 | && SCM_CONSP (SCM_CDDR (formals)))))) | |
4037 | goto umwrongnumargs; | |
0c32d76c | 4038 | #ifdef DEVAL |
ddd8f927 DH |
4039 | env = SCM_EXTEND_ENV (formals, |
4040 | debug.info->a.args, | |
4041 | SCM_ENV (proc)); | |
195847fa | 4042 | #else |
ddd8f927 DH |
4043 | env = SCM_EXTEND_ENV (formals, |
4044 | scm_list_2 (arg1, arg2), | |
4045 | SCM_ENV (proc)); | |
195847fa | 4046 | #endif |
ddd8f927 DH |
4047 | x = SCM_CLOSURE_BODY (proc); |
4048 | goto nontoplevel_begin; | |
4049 | } | |
42030fb2 DH |
4050 | } |
4051 | } | |
42030fb2 | 4052 | if (!SCM_CONSP (x)) |
ab1f1094 | 4053 | scm_wrong_num_args (proc); |
42030fb2 DH |
4054 | #ifdef DEVAL |
4055 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4056 | deval_args (x, env, proc, | |
4057 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4058 | #endif | |
4059 | ENTER_APPLY; | |
4060 | evap3: | |
ddd8f927 | 4061 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4062 | switch (SCM_TYP7 (proc)) |
4063 | { /* have 3 or more arguments */ | |
4064 | #ifdef DEVAL | |
6dbd0af5 | 4065 | case scm_tc7_subr_3: |
ab1f1094 DH |
4066 | if (!SCM_NULLP (SCM_CDR (x))) |
4067 | scm_wrong_num_args (proc); | |
4068 | else | |
4069 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4070 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4071 | case scm_tc7_asubr: |
4072 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4073 | arg2 = SCM_CDDR (debug.info->a.args); | |
4074 | do | |
4075 | { | |
4076 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4077 | arg2 = SCM_CDR (arg2); | |
4078 | } | |
4079 | while (SCM_NIMP (arg2)); | |
4080 | RETURN (arg1); | |
4081 | case scm_tc7_rpsubr: | |
4082 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4083 | RETURN (SCM_BOOL_F); | |
4084 | arg1 = SCM_CDDR (debug.info->a.args); | |
4085 | do | |
4086 | { | |
4087 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) | |
4088 | RETURN (SCM_BOOL_F); | |
4089 | arg2 = SCM_CAR (arg1); | |
4090 | arg1 = SCM_CDR (arg1); | |
4091 | } | |
4092 | while (SCM_NIMP (arg1)); | |
4093 | RETURN (SCM_BOOL_T); | |
4094 | case scm_tc7_lsubr_2: | |
4095 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4096 | SCM_CDDR (debug.info->a.args))); | |
4097 | case scm_tc7_lsubr: | |
4098 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4099 | case scm_tc7_smob: | |
4100 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4101 | goto badfun; | |
4102 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4103 | SCM_CDDR (debug.info->a.args))); | |
4104 | case scm_tc7_cclo: | |
4105 | goto cclon; | |
002f1a5d MD |
4106 | case scm_tc7_pws: |
4107 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4108 | debug.info->a.proc = proc; |
002f1a5d | 4109 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4110 | goto evap3; |
ddd8f927 | 4111 | /* fallthrough */ |
6dbd0af5 | 4112 | case scm_tcs_closures: |
ddd8f927 DH |
4113 | { |
4114 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4115 | if (SCM_NULLP (formals) | |
4116 | || (SCM_CONSP (formals) | |
4117 | && (SCM_NULLP (SCM_CDR (formals)) | |
4118 | || (SCM_CONSP (SCM_CDR (formals)) | |
4119 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4120 | goto umwrongnumargs; | |
4121 | SCM_SET_ARGSREADY (debug); | |
4122 | env = SCM_EXTEND_ENV (formals, | |
4123 | debug.info->a.args, | |
4124 | SCM_ENV (proc)); | |
4125 | x = SCM_CLOSURE_BODY (proc); | |
4126 | goto nontoplevel_begin; | |
4127 | } | |
6dbd0af5 | 4128 | #else /* DEVAL */ |
42030fb2 | 4129 | case scm_tc7_subr_3: |
ab1f1094 DH |
4130 | if (!SCM_NULLP (SCM_CDR (x))) |
4131 | scm_wrong_num_args (proc); | |
4132 | else | |
4133 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4134 | case scm_tc7_asubr: |
4135 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4136 | do | |
4137 | { | |
4138 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4139 | x = SCM_CDR(x); | |
4140 | } | |
6bff1368 | 4141 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4142 | RETURN (arg1); |
4143 | case scm_tc7_rpsubr: | |
4144 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4145 | RETURN (SCM_BOOL_F); | |
4146 | do | |
4147 | { | |
4148 | arg1 = EVALCAR (x, env); | |
4149 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1))) | |
4150 | RETURN (SCM_BOOL_F); | |
4151 | arg2 = arg1; | |
4152 | x = SCM_CDR (x); | |
4153 | } | |
6bff1368 | 4154 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4155 | RETURN (SCM_BOOL_T); |
4156 | case scm_tc7_lsubr_2: | |
4157 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4158 | case scm_tc7_lsubr: | |
4159 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4160 | arg2, | |
4161 | scm_eval_args (x, env, proc)))); | |
4162 | case scm_tc7_smob: | |
4163 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4164 | goto badfun; | |
4165 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4166 | scm_eval_args (x, env, proc))); | |
4167 | case scm_tc7_cclo: | |
4168 | goto cclon; | |
4169 | case scm_tc7_pws: | |
4170 | proc = SCM_PROCEDURE (proc); | |
4171 | if (!SCM_CLOSUREP (proc)) | |
4172 | goto evap3; | |
ddd8f927 DH |
4173 | /* fallthrough */ |
4174 | case scm_tcs_closures: | |
da7f71d7 | 4175 | { |
ddd8f927 | 4176 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
42030fb2 DH |
4177 | if (SCM_NULLP (formals) |
4178 | || (SCM_CONSP (formals) | |
4179 | && (SCM_NULLP (SCM_CDR (formals)) | |
4180 | || (SCM_CONSP (SCM_CDR (formals)) | |
4181 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4182 | goto umwrongnumargs; | |
ddd8f927 DH |
4183 | env = SCM_EXTEND_ENV (formals, |
4184 | scm_cons2 (arg1, | |
4185 | arg2, | |
4186 | scm_eval_args (x, env, proc)), | |
4187 | SCM_ENV (proc)); | |
4188 | x = SCM_CLOSURE_BODY (proc); | |
4189 | goto nontoplevel_begin; | |
da7f71d7 | 4190 | } |
0f2d19dd | 4191 | #endif /* DEVAL */ |
42030fb2 DH |
4192 | case scm_tcs_struct: |
4193 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4194 | { | |
f3d2630a | 4195 | #ifdef DEVAL |
42030fb2 | 4196 | arg1 = debug.info->a.args; |
f3d2630a | 4197 | #else |
42030fb2 | 4198 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4199 | #endif |
42030fb2 DH |
4200 | x = SCM_ENTITY_PROCEDURE (proc); |
4201 | goto type_dispatch; | |
4202 | } | |
2ca0d207 | 4203 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4204 | goto operatorn; |
2ca0d207 DH |
4205 | else |
4206 | goto badfun; | |
42030fb2 DH |
4207 | case scm_tc7_subr_2: |
4208 | case scm_tc7_subr_1o: | |
4209 | case scm_tc7_subr_2o: | |
4210 | case scm_tc7_subr_0: | |
14b18ed6 | 4211 | case scm_tc7_dsubr: |
42030fb2 DH |
4212 | case scm_tc7_cxr: |
4213 | case scm_tc7_subr_1: | |
ab1f1094 | 4214 | scm_wrong_num_args (proc); |
42030fb2 | 4215 | default: |
9b07e212 | 4216 | goto badfun; |
42030fb2 DH |
4217 | } |
4218 | } | |
0f2d19dd JB |
4219 | } |
4220 | #ifdef DEVAL | |
6dbd0af5 | 4221 | exit: |
5132eef0 | 4222 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4223 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4224 | { |
b7ff98dd MD |
4225 | SCM_CLEAR_TRACED_FRAME (debug); |
4226 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4227 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4228 | else |
4229 | { | |
5f144b10 GH |
4230 | int first; |
4231 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4232 | |
5f144b10 | 4233 | if (first) |
dff98306 | 4234 | arg1 = val; |
5f144b10 | 4235 | else |
6dbd0af5 | 4236 | { |
5f144b10 | 4237 | proc = val; |
6dbd0af5 MD |
4238 | goto ret; |
4239 | } | |
4240 | } | |
d95c0b76 | 4241 | SCM_TRAPS_P = 0; |
dff98306 | 4242 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4243 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4244 | } |
4245 | ret: | |
1646d37b | 4246 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4247 | return proc; |
4248 | #endif | |
4249 | } | |
4250 | ||
6dbd0af5 MD |
4251 | |
4252 | /* SECTION: This code is compiled once. | |
4253 | */ | |
4254 | ||
0f2d19dd JB |
4255 | #ifndef DEVAL |
4256 | ||
fdc28395 | 4257 | \f |
d0b07b5d | 4258 | |
fdc28395 KN |
4259 | /* Simple procedure calls |
4260 | */ | |
4261 | ||
4262 | SCM | |
4263 | scm_call_0 (SCM proc) | |
4264 | { | |
4265 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4266 | } | |
4267 | ||
4268 | SCM | |
4269 | scm_call_1 (SCM proc, SCM arg1) | |
4270 | { | |
4271 | return scm_apply (proc, arg1, scm_listofnull); | |
4272 | } | |
4273 | ||
4274 | SCM | |
4275 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4276 | { | |
4277 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4278 | } | |
4279 | ||
4280 | SCM | |
4281 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4282 | { | |
4283 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4284 | } | |
4285 | ||
d95c0b76 NJ |
4286 | SCM |
4287 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4288 | { | |
4289 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4290 | scm_cons (arg4, scm_listofnull))); | |
4291 | } | |
4292 | ||
fdc28395 KN |
4293 | /* Simple procedure applies |
4294 | */ | |
4295 | ||
4296 | SCM | |
4297 | scm_apply_0 (SCM proc, SCM args) | |
4298 | { | |
4299 | return scm_apply (proc, args, SCM_EOL); | |
4300 | } | |
4301 | ||
4302 | SCM | |
4303 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4304 | { | |
4305 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4306 | } | |
4307 | ||
4308 | SCM | |
4309 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4310 | { | |
4311 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4312 | } | |
4313 | ||
4314 | SCM | |
4315 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4316 | { | |
4317 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4318 | SCM_EOL); | |
4319 | } | |
4320 | ||
82a2622a | 4321 | /* This code processes the arguments to apply: |
b145c172 JB |
4322 | |
4323 | (apply PROC ARG1 ... ARGS) | |
4324 | ||
82a2622a JB |
4325 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4326 | ... arguments onto the front of ARGS, and returns the resulting | |
4327 | list. Note that ARGS is a list; thus, the argument to this | |
4328 | function is a list whose last element is a list. | |
4329 | ||
4330 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4331 | result. apply:nconc2last takes care of building the list of |
4332 | arguments, given (ARG1 ... ARGS). | |
4333 | ||
82a2622a JB |
4334 | Rather than do new consing, apply:nconc2last destroys its argument. |
4335 | On that topic, this code came into my care with the following | |
4336 | beautifully cryptic comment on that topic: "This will only screw | |
4337 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4338 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4339 | |
3b3b36dd | 4340 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4341 | (SCM lst), |
4342 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4343 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4344 | "@var{args}, and returns the resulting list. Note that\n" | |
4345 | "@var{args} is a list; thus, the argument to this function is\n" | |
4346 | "a list whose last element is a list.\n" | |
4347 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4348 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4349 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4350 | { |
4351 | SCM *lloc; | |
34d19ef6 | 4352 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4353 | lloc = &lst; |
c96d76b8 NJ |
4354 | while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be |
4355 | SCM_NULL_OR_NIL_P, but not | |
4356 | needed in 99.99% of cases, | |
4357 | and it could seriously hurt | |
4358 | performance. - Neil */ | |
a23afe53 | 4359 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4360 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4361 | *lloc = SCM_CAR (*lloc); |
4362 | return lst; | |
4363 | } | |
1bbd0b84 | 4364 | #undef FUNC_NAME |
0f2d19dd JB |
4365 | |
4366 | #endif /* !DEVAL */ | |
4367 | ||
6dbd0af5 MD |
4368 | |
4369 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4370 | * It is compiled twice. | |
4371 | */ | |
4372 | ||
0f2d19dd | 4373 | #if 0 |
0f2d19dd | 4374 | SCM |
6e8d25a6 | 4375 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4376 | {} |
4377 | #endif | |
4378 | ||
4379 | #if 0 | |
0f2d19dd | 4380 | SCM |
6e8d25a6 | 4381 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4382 | {} |
0f2d19dd JB |
4383 | #endif |
4384 | ||
1cc91f1b | 4385 | |
82a2622a JB |
4386 | /* Apply a function to a list of arguments. |
4387 | ||
4388 | This function is exported to the Scheme level as taking two | |
4389 | required arguments and a tail argument, as if it were: | |
4390 | (lambda (proc arg1 . args) ...) | |
4391 | Thus, if you just have a list of arguments to pass to a procedure, | |
4392 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4393 | args, pass the first as ARG1, then cons any remaining fixed args | |
4394 | onto the front of your argument list, and pass that as ARGS. */ | |
4395 | ||
0f2d19dd | 4396 | SCM |
1bbd0b84 | 4397 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4398 | { |
0f2d19dd | 4399 | #ifdef DEVAL |
92c2555f MV |
4400 | scm_t_debug_frame debug; |
4401 | scm_t_debug_info debug_vect_body; | |
1646d37b | 4402 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 4403 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4404 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4405 | debug.vect[0].a.proc = proc; |
4406 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 4407 | scm_last_debug_frame = &debug; |
0f2d19dd | 4408 | #else |
b7ff98dd | 4409 | if (SCM_DEBUGGINGP) |
0f2d19dd | 4410 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4411 | #endif |
4412 | ||
4413 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4414 | |
4415 | /* If ARGS is the empty list, then we're calling apply with only two | |
4416 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4417 | the case, futz with things so that ARG1 is the first argument to | |
4418 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4419 | rest. |
4420 | ||
4421 | Setting the debug apply frame args this way is pretty messy. | |
4422 | Perhaps we should store arg1 and args directly in the frame as | |
4423 | received, and let scm_frame_arguments unpack them, because that's | |
4424 | a relatively rare operation. This works for now; if the Guile | |
4425 | developer archives are still around, see Mikael's post of | |
4426 | 11-Apr-97. */ | |
0f2d19dd JB |
4427 | if (SCM_NULLP (args)) |
4428 | { | |
4429 | if (SCM_NULLP (arg1)) | |
30000774 JB |
4430 | { |
4431 | arg1 = SCM_UNDEFINED; | |
4432 | #ifdef DEVAL | |
4433 | debug.vect[0].a.args = SCM_EOL; | |
4434 | #endif | |
4435 | } | |
0f2d19dd JB |
4436 | else |
4437 | { | |
30000774 JB |
4438 | #ifdef DEVAL |
4439 | debug.vect[0].a.args = arg1; | |
4440 | #endif | |
0f2d19dd JB |
4441 | args = SCM_CDR (arg1); |
4442 | arg1 = SCM_CAR (arg1); | |
4443 | } | |
4444 | } | |
4445 | else | |
4446 | { | |
0f2d19dd | 4447 | args = scm_nconc2last (args); |
30000774 JB |
4448 | #ifdef DEVAL |
4449 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4450 | #endif | |
0f2d19dd | 4451 | } |
0f2d19dd | 4452 | #ifdef DEVAL |
b6d75948 | 4453 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4454 | { |
4455 | SCM tmp; | |
b7ff98dd | 4456 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4457 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4458 | else |
4459 | { | |
5f144b10 GH |
4460 | int first; |
4461 | ||
4462 | tmp = scm_make_continuation (&first); | |
4463 | if (!first) | |
6dbd0af5 MD |
4464 | goto entap; |
4465 | } | |
d95c0b76 NJ |
4466 | SCM_TRAPS_P = 0; |
4467 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4468 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4469 | } |
4470 | entap: | |
4471 | ENTER_APPLY; | |
4472 | #endif | |
6dbd0af5 | 4473 | tail: |
0f2d19dd JB |
4474 | switch (SCM_TYP7 (proc)) |
4475 | { | |
4476 | case scm_tc7_subr_2o: | |
4477 | args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args); | |
ddea3325 | 4478 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4479 | case scm_tc7_subr_2: |
ab1f1094 DH |
4480 | if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args))) |
4481 | scm_wrong_num_args (proc); | |
0f2d19dd | 4482 | args = SCM_CAR (args); |
ddea3325 | 4483 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4484 | case scm_tc7_subr_0: |
ab1f1094 DH |
4485 | if (!SCM_UNBNDP (arg1)) |
4486 | scm_wrong_num_args (proc); | |
4487 | else | |
4488 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4489 | case scm_tc7_subr_1: |
ab1f1094 DH |
4490 | if (SCM_UNBNDP (arg1)) |
4491 | scm_wrong_num_args (proc); | |
0f2d19dd | 4492 | case scm_tc7_subr_1o: |
ab1f1094 DH |
4493 | if (!SCM_NULLP (args)) |
4494 | scm_wrong_num_args (proc); | |
4495 | else | |
4496 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
4497 | case scm_tc7_dsubr: |
4498 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) | |
4499 | scm_wrong_num_args (proc); | |
4500 | if (SCM_INUMP (arg1)) | |
4501 | { | |
4502 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4503 | } | |
4504 | else if (SCM_REALP (arg1)) | |
4505 | { | |
4506 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4507 | } | |
4508 | else if (SCM_BIGP (arg1)) | |
f92e85f7 MV |
4509 | { |
4510 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4511 | } | |
4512 | else if (SCM_FRACTIONP (arg1)) | |
4513 | { | |
4514 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4515 | } | |
14b18ed6 DH |
4516 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4517 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
0f2d19dd | 4518 | case scm_tc7_cxr: |
ab1f1094 DH |
4519 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) |
4520 | scm_wrong_num_args (proc); | |
0f2d19dd | 4521 | { |
14b18ed6 DH |
4522 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4523 | do | |
4524 | { | |
4525 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4526 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4527 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4528 | pattern >>= 2; | |
4529 | } while (pattern); | |
4530 | RETURN (arg1); | |
0f2d19dd JB |
4531 | } |
4532 | case scm_tc7_subr_3: | |
ab1f1094 DH |
4533 | if (SCM_NULLP (args) |
4534 | || SCM_NULLP (SCM_CDR (args)) | |
4535 | || !SCM_NULLP (SCM_CDDR (args))) | |
4536 | scm_wrong_num_args (proc); | |
4537 | else | |
4538 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4539 | case scm_tc7_lsubr: |
4540 | #ifdef DEVAL | |
ddea3325 | 4541 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4542 | #else |
ddea3325 | 4543 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4544 | #endif |
4545 | case scm_tc7_lsubr_2: | |
ab1f1094 DH |
4546 | if (!SCM_CONSP (args)) |
4547 | scm_wrong_num_args (proc); | |
4548 | else | |
4549 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd JB |
4550 | case scm_tc7_asubr: |
4551 | if (SCM_NULLP (args)) | |
ddea3325 | 4552 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4553 | while (SCM_NIMP (args)) |
4554 | { | |
4555 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4556 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); | |
4557 | args = SCM_CDR (args); | |
4558 | } | |
4559 | RETURN (arg1); | |
4560 | case scm_tc7_rpsubr: | |
4561 | if (SCM_NULLP (args)) | |
4562 | RETURN (SCM_BOOL_T); | |
4563 | while (SCM_NIMP (args)) | |
4564 | { | |
4565 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4566 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) | |
4567 | RETURN (SCM_BOOL_F); | |
4568 | arg1 = SCM_CAR (args); | |
4569 | args = SCM_CDR (args); | |
4570 | } | |
4571 | RETURN (SCM_BOOL_T); | |
4572 | case scm_tcs_closures: | |
4573 | #ifdef DEVAL | |
6dbd0af5 | 4574 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4575 | #else |
4576 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4577 | #endif | |
726d810a | 4578 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4579 | scm_wrong_num_args (proc); |
1609038c MD |
4580 | |
4581 | /* Copy argument list */ | |
4582 | if (SCM_IMP (arg1)) | |
4583 | args = arg1; | |
4584 | else | |
4585 | { | |
4586 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
05b15362 | 4587 | for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4588 | { |
05b15362 | 4589 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4590 | tl = SCM_CDR (tl); |
4591 | } | |
4592 | SCM_SETCDR (tl, arg1); | |
4593 | } | |
4594 | ||
821f18a4 DH |
4595 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4596 | args, | |
4597 | SCM_ENV (proc)); | |
f9450cdb | 4598 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4599 | again: |
05b15362 DH |
4600 | arg1 = SCM_CDR (proc); |
4601 | while (!SCM_NULLP (arg1)) | |
2ddb0920 MD |
4602 | { |
4603 | if (SCM_IMP (SCM_CAR (proc))) | |
4604 | { | |
4605 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4606 | { | |
28d52ebb | 4607 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4608 | /* check for race condition */ |
4609 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4610 | m_expand_body (proc, args); |
28d52ebb | 4611 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4612 | goto again; |
2ddb0920 | 4613 | } |
5280aaca | 4614 | else |
17fa3fcf | 4615 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4616 | } |
4617 | else | |
e791c18f MD |
4618 | SCM_CEVAL (SCM_CAR (proc), args); |
4619 | proc = arg1; | |
05b15362 | 4620 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4621 | } |
e791c18f | 4622 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4623 | case scm_tc7_smob: |
68b06924 | 4624 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4625 | goto badproc; |
afa38f6e | 4626 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4627 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
afa38f6e | 4628 | else if (SCM_NULLP (args)) |
ddea3325 | 4629 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
0717dfd8 | 4630 | else if (SCM_NULLP (SCM_CDR (args))) |
ddea3325 | 4631 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4632 | else |
68b06924 | 4633 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4634 | case scm_tc7_cclo: |
4635 | #ifdef DEVAL | |
6dbd0af5 MD |
4636 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4637 | arg1 = proc; | |
4638 | proc = SCM_CCLO_SUBR (proc); | |
4639 | debug.vect[0].a.proc = proc; | |
4640 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4641 | #else |
4642 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4643 | arg1 = proc; |
4644 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4645 | #endif |
0f2d19dd | 4646 | goto tail; |
89efbff4 MD |
4647 | case scm_tc7_pws: |
4648 | proc = SCM_PROCEDURE (proc); | |
4649 | #ifdef DEVAL | |
4650 | debug.vect[0].a.proc = proc; | |
4651 | #endif | |
4652 | goto tail; | |
904a077d | 4653 | case scm_tcs_struct: |
f3d2630a MD |
4654 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4655 | { | |
4656 | #ifdef DEVAL | |
4657 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4658 | #else | |
4659 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4660 | #endif | |
195847fa | 4661 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4662 | } |
2ca0d207 | 4663 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4664 | { |
504d99c5 | 4665 | /* operator */ |
da7f71d7 MD |
4666 | #ifdef DEVAL |
4667 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4668 | #else | |
4669 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4670 | #endif | |
4671 | arg1 = proc; | |
195847fa MD |
4672 | proc = (SCM_I_ENTITYP (proc) |
4673 | ? SCM_ENTITY_PROCEDURE (proc) | |
4674 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4675 | #ifdef DEVAL |
4676 | debug.vect[0].a.proc = proc; | |
4677 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4678 | #endif | |
195847fa MD |
4679 | if (SCM_NIMP (proc)) |
4680 | goto tail; | |
4681 | else | |
4682 | goto badproc; | |
da7f71d7 | 4683 | } |
2ca0d207 DH |
4684 | else |
4685 | goto badproc; | |
0f2d19dd JB |
4686 | default: |
4687 | badproc: | |
db4b4ca6 | 4688 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
4689 | } |
4690 | #ifdef DEVAL | |
6dbd0af5 | 4691 | exit: |
5132eef0 | 4692 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4693 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4694 | { |
b7ff98dd MD |
4695 | SCM_CLEAR_TRACED_FRAME (debug); |
4696 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 4697 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4698 | else |
4699 | { | |
5f144b10 GH |
4700 | int first; |
4701 | SCM val = scm_make_continuation (&first); | |
4702 | ||
4703 | if (first) | |
4704 | arg1 = val; | |
4705 | else | |
6dbd0af5 | 4706 | { |
5f144b10 | 4707 | proc = val; |
6dbd0af5 MD |
4708 | goto ret; |
4709 | } | |
4710 | } | |
d95c0b76 NJ |
4711 | SCM_TRAPS_P = 0; |
4712 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
4713 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4714 | } |
4715 | ret: | |
1646d37b | 4716 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4717 | return proc; |
4718 | #endif | |
4719 | } | |
4720 | ||
6dbd0af5 MD |
4721 | |
4722 | /* SECTION: The rest of this file is only read once. | |
4723 | */ | |
4724 | ||
0f2d19dd JB |
4725 | #ifndef DEVAL |
4726 | ||
504d99c5 MD |
4727 | /* Trampolines |
4728 | * | |
4729 | * Trampolines make it possible to move procedure application dispatch | |
4730 | * outside inner loops. The motivation was clean implementation of | |
4731 | * efficient replacements of R5RS primitives in SRFI-1. | |
4732 | * | |
4733 | * The semantics is clear: scm_trampoline_N returns an optimized | |
4734 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
4735 | * on N args). | |
4736 | * | |
4737 | * Applying the optimization to map and for-each increased efficiency | |
4738 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
4739 | * before. | |
4740 | */ | |
4741 | ||
756414cf MD |
4742 | static SCM |
4743 | call_subr0_0 (SCM proc) | |
4744 | { | |
4745 | return SCM_SUBRF (proc) (); | |
4746 | } | |
4747 | ||
4748 | static SCM | |
4749 | call_subr1o_0 (SCM proc) | |
4750 | { | |
4751 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
4752 | } | |
4753 | ||
4754 | static SCM | |
4755 | call_lsubr_0 (SCM proc) | |
4756 | { | |
4757 | return SCM_SUBRF (proc) (SCM_EOL); | |
4758 | } | |
4759 | ||
4760 | SCM | |
4761 | scm_i_call_closure_0 (SCM proc) | |
4762 | { | |
6a3f13f0 DH |
4763 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4764 | SCM_EOL, | |
4765 | SCM_ENV (proc)); | |
4766 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4767 | return result; |
756414cf MD |
4768 | } |
4769 | ||
4770 | scm_t_trampoline_0 | |
4771 | scm_trampoline_0 (SCM proc) | |
4772 | { | |
2510c810 DH |
4773 | scm_t_trampoline_0 trampoline; |
4774 | ||
756414cf | 4775 | if (SCM_IMP (proc)) |
d0b07b5d | 4776 | return NULL; |
2510c810 | 4777 | |
756414cf MD |
4778 | switch (SCM_TYP7 (proc)) |
4779 | { | |
4780 | case scm_tc7_subr_0: | |
2510c810 DH |
4781 | trampoline = call_subr0_0; |
4782 | break; | |
756414cf | 4783 | case scm_tc7_subr_1o: |
2510c810 DH |
4784 | trampoline = call_subr1o_0; |
4785 | break; | |
756414cf | 4786 | case scm_tc7_lsubr: |
2510c810 DH |
4787 | trampoline = call_lsubr_0; |
4788 | break; | |
756414cf MD |
4789 | case scm_tcs_closures: |
4790 | { | |
4791 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b | 4792 | if (SCM_NULLP (formals) || !SCM_CONSP (formals)) |
2510c810 | 4793 | trampoline = scm_i_call_closure_0; |
756414cf | 4794 | else |
d0b07b5d | 4795 | return NULL; |
2510c810 | 4796 | break; |
756414cf MD |
4797 | } |
4798 | case scm_tcs_struct: | |
4799 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4800 | trampoline = scm_call_generic_0; |
2ca0d207 | 4801 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4802 | trampoline = scm_call_0; |
4803 | else | |
4804 | return NULL; | |
4805 | break; | |
756414cf MD |
4806 | case scm_tc7_smob: |
4807 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4808 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 4809 | else |
d0b07b5d | 4810 | return NULL; |
2510c810 | 4811 | break; |
756414cf MD |
4812 | case scm_tc7_asubr: |
4813 | case scm_tc7_rpsubr: | |
4814 | case scm_tc7_cclo: | |
4815 | case scm_tc7_pws: | |
2510c810 DH |
4816 | trampoline = scm_call_0; |
4817 | break; | |
756414cf | 4818 | default: |
2510c810 | 4819 | return NULL; /* not applicable on zero arguments */ |
756414cf | 4820 | } |
2510c810 DH |
4821 | /* We only reach this point if a valid trampoline was determined. */ |
4822 | ||
4823 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4824 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
4825 | if (SCM_DEBUGGINGP) | |
4826 | return scm_call_0; | |
4827 | else | |
4828 | return trampoline; | |
756414cf MD |
4829 | } |
4830 | ||
504d99c5 MD |
4831 | static SCM |
4832 | call_subr1_1 (SCM proc, SCM arg1) | |
4833 | { | |
4834 | return SCM_SUBRF (proc) (arg1); | |
4835 | } | |
4836 | ||
9ed24633 MD |
4837 | static SCM |
4838 | call_subr2o_1 (SCM proc, SCM arg1) | |
4839 | { | |
4840 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
4841 | } | |
4842 | ||
504d99c5 MD |
4843 | static SCM |
4844 | call_lsubr_1 (SCM proc, SCM arg1) | |
4845 | { | |
4846 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
4847 | } | |
4848 | ||
4849 | static SCM | |
4850 | call_dsubr_1 (SCM proc, SCM arg1) | |
4851 | { | |
4852 | if (SCM_INUMP (arg1)) | |
4853 | { | |
4854 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4855 | } | |
4856 | else if (SCM_REALP (arg1)) | |
4857 | { | |
4858 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4859 | } | |
504d99c5 | 4860 | else if (SCM_BIGP (arg1)) |
f92e85f7 MV |
4861 | { |
4862 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4863 | } | |
4864 | else if (SCM_FRACTIONP (arg1)) | |
4865 | { | |
4866 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4867 | } | |
504d99c5 MD |
4868 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4869 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4870 | } | |
4871 | ||
4872 | static SCM | |
4873 | call_cxr_1 (SCM proc, SCM arg1) | |
4874 | { | |
14b18ed6 DH |
4875 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4876 | do | |
4877 | { | |
4878 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4879 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4880 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4881 | pattern >>= 2; | |
4882 | } while (pattern); | |
4883 | return arg1; | |
504d99c5 MD |
4884 | } |
4885 | ||
4886 | static SCM | |
4887 | call_closure_1 (SCM proc, SCM arg1) | |
4888 | { | |
6a3f13f0 DH |
4889 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4890 | scm_list_1 (arg1), | |
4891 | SCM_ENV (proc)); | |
4892 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4893 | return result; |
504d99c5 MD |
4894 | } |
4895 | ||
4896 | scm_t_trampoline_1 | |
4897 | scm_trampoline_1 (SCM proc) | |
4898 | { | |
2510c810 DH |
4899 | scm_t_trampoline_1 trampoline; |
4900 | ||
504d99c5 | 4901 | if (SCM_IMP (proc)) |
d0b07b5d | 4902 | return NULL; |
2510c810 | 4903 | |
504d99c5 MD |
4904 | switch (SCM_TYP7 (proc)) |
4905 | { | |
4906 | case scm_tc7_subr_1: | |
4907 | case scm_tc7_subr_1o: | |
2510c810 DH |
4908 | trampoline = call_subr1_1; |
4909 | break; | |
9ed24633 | 4910 | case scm_tc7_subr_2o: |
2510c810 DH |
4911 | trampoline = call_subr2o_1; |
4912 | break; | |
504d99c5 | 4913 | case scm_tc7_lsubr: |
2510c810 DH |
4914 | trampoline = call_lsubr_1; |
4915 | break; | |
14b18ed6 | 4916 | case scm_tc7_dsubr: |
2510c810 DH |
4917 | trampoline = call_dsubr_1; |
4918 | break; | |
504d99c5 | 4919 | case scm_tc7_cxr: |
2510c810 DH |
4920 | trampoline = call_cxr_1; |
4921 | break; | |
504d99c5 MD |
4922 | case scm_tcs_closures: |
4923 | { | |
4924 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4925 | if (!SCM_NULLP (formals) |
4926 | && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals)))) | |
2510c810 | 4927 | trampoline = call_closure_1; |
504d99c5 | 4928 | else |
d0b07b5d | 4929 | return NULL; |
2510c810 | 4930 | break; |
504d99c5 MD |
4931 | } |
4932 | case scm_tcs_struct: | |
4933 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4934 | trampoline = scm_call_generic_1; |
2ca0d207 | 4935 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4936 | trampoline = scm_call_1; |
4937 | else | |
4938 | return NULL; | |
4939 | break; | |
504d99c5 MD |
4940 | case scm_tc7_smob: |
4941 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4942 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 4943 | else |
d0b07b5d | 4944 | return NULL; |
2510c810 | 4945 | break; |
504d99c5 MD |
4946 | case scm_tc7_asubr: |
4947 | case scm_tc7_rpsubr: | |
4948 | case scm_tc7_cclo: | |
4949 | case scm_tc7_pws: | |
2510c810 DH |
4950 | trampoline = scm_call_1; |
4951 | break; | |
504d99c5 | 4952 | default: |
d0b07b5d | 4953 | return NULL; /* not applicable on one arg */ |
504d99c5 | 4954 | } |
2510c810 DH |
4955 | /* We only reach this point if a valid trampoline was determined. */ |
4956 | ||
4957 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4958 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
4959 | if (SCM_DEBUGGINGP) | |
4960 | return scm_call_1; | |
4961 | else | |
4962 | return trampoline; | |
504d99c5 MD |
4963 | } |
4964 | ||
4965 | static SCM | |
4966 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4967 | { | |
4968 | return SCM_SUBRF (proc) (arg1, arg2); | |
4969 | } | |
4970 | ||
9ed24633 MD |
4971 | static SCM |
4972 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4973 | { | |
4974 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
4975 | } | |
4976 | ||
504d99c5 MD |
4977 | static SCM |
4978 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
4979 | { | |
4980 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
4981 | } | |
4982 | ||
4983 | static SCM | |
4984 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
4985 | { | |
6a3f13f0 DH |
4986 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4987 | scm_list_2 (arg1, arg2), | |
4988 | SCM_ENV (proc)); | |
4989 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4990 | return result; |
504d99c5 MD |
4991 | } |
4992 | ||
4993 | scm_t_trampoline_2 | |
4994 | scm_trampoline_2 (SCM proc) | |
4995 | { | |
2510c810 DH |
4996 | scm_t_trampoline_2 trampoline; |
4997 | ||
504d99c5 | 4998 | if (SCM_IMP (proc)) |
d0b07b5d | 4999 | return NULL; |
2510c810 | 5000 | |
504d99c5 MD |
5001 | switch (SCM_TYP7 (proc)) |
5002 | { | |
5003 | case scm_tc7_subr_2: | |
5004 | case scm_tc7_subr_2o: | |
5005 | case scm_tc7_rpsubr: | |
5006 | case scm_tc7_asubr: | |
2510c810 DH |
5007 | trampoline = call_subr2_2; |
5008 | break; | |
9ed24633 | 5009 | case scm_tc7_lsubr_2: |
2510c810 DH |
5010 | trampoline = call_lsubr2_2; |
5011 | break; | |
504d99c5 | 5012 | case scm_tc7_lsubr: |
2510c810 DH |
5013 | trampoline = call_lsubr_2; |
5014 | break; | |
504d99c5 MD |
5015 | case scm_tcs_closures: |
5016 | { | |
5017 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
5018 | if (!SCM_NULLP (formals) |
5019 | && (!SCM_CONSP (formals) | |
5020 | || (!SCM_NULLP (SCM_CDR (formals)) | |
5021 | && (!SCM_CONSP (SCM_CDR (formals)) | |
5022 | || !SCM_CONSP (SCM_CDDR (formals)))))) | |
2510c810 | 5023 | trampoline = call_closure_2; |
504d99c5 | 5024 | else |
d0b07b5d | 5025 | return NULL; |
2510c810 | 5026 | break; |
504d99c5 MD |
5027 | } |
5028 | case scm_tcs_struct: | |
5029 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5030 | trampoline = scm_call_generic_2; |
2ca0d207 | 5031 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5032 | trampoline = scm_call_2; |
5033 | else | |
5034 | return NULL; | |
5035 | break; | |
504d99c5 MD |
5036 | case scm_tc7_smob: |
5037 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5038 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5039 | else |
d0b07b5d | 5040 | return NULL; |
2510c810 | 5041 | break; |
504d99c5 MD |
5042 | case scm_tc7_cclo: |
5043 | case scm_tc7_pws: | |
2510c810 DH |
5044 | trampoline = scm_call_2; |
5045 | break; | |
504d99c5 | 5046 | default: |
d0b07b5d | 5047 | return NULL; /* not applicable on two args */ |
504d99c5 | 5048 | } |
2510c810 DH |
5049 | /* We only reach this point if a valid trampoline was determined. */ |
5050 | ||
5051 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5052 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
5053 | if (SCM_DEBUGGINGP) | |
5054 | return scm_call_2; | |
5055 | else | |
5056 | return trampoline; | |
504d99c5 MD |
5057 | } |
5058 | ||
d9c393f5 JB |
5059 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5060 | ||
47c3f06d | 5061 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5062 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5063 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5064 | static inline void |
47c3f06d | 5065 | check_map_args (SCM argv, |
c014a02e | 5066 | long len, |
47c3f06d MD |
5067 | SCM gf, |
5068 | SCM proc, | |
5069 | SCM args, | |
5070 | const char *who) | |
d9c393f5 | 5071 | { |
34d19ef6 | 5072 | SCM const *ve = SCM_VELTS (argv); |
c014a02e | 5073 | long i; |
d9c393f5 | 5074 | |
b5c2579a | 5075 | for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5076 | { |
c014a02e | 5077 | long elt_len = scm_ilength (ve[i]); |
d9c393f5 JB |
5078 | |
5079 | if (elt_len < 0) | |
47c3f06d MD |
5080 | { |
5081 | if (gf) | |
5082 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5083 | else | |
5084 | scm_wrong_type_arg (who, i + 2, ve[i]); | |
5085 | } | |
d9c393f5 JB |
5086 | |
5087 | if (elt_len != len) | |
504d99c5 | 5088 | scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2)); |
d9c393f5 JB |
5089 | } |
5090 | ||
5d2b97cd | 5091 | scm_remember_upto_here_1 (argv); |
d9c393f5 JB |
5092 | } |
5093 | ||
5094 | ||
47c3f06d | 5095 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5096 | |
368bf056 MD |
5097 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5098 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5099 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5100 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5101 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5102 | */ |
5103 | ||
0f2d19dd | 5104 | SCM |
1bbd0b84 | 5105 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5106 | #define FUNC_NAME s_map |
0f2d19dd | 5107 | { |
c014a02e | 5108 | long i, len; |
0f2d19dd JB |
5109 | SCM res = SCM_EOL; |
5110 | SCM *pres = &res; | |
34d19ef6 | 5111 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
0f2d19dd | 5112 | |
d9c393f5 | 5113 | len = scm_ilength (arg1); |
47c3f06d MD |
5114 | SCM_GASSERTn (len >= 0, |
5115 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5116 | SCM_VALIDATE_REST_ARGUMENT (args); |
0f2d19dd JB |
5117 | if (SCM_NULLP (args)) |
5118 | { | |
504d99c5 MD |
5119 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5120 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5121 | while (SCM_NIMP (arg1)) | |
5122 | { | |
5123 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5124 | pres = SCM_CDRLOC (*pres); | |
5125 | arg1 = SCM_CDR (arg1); | |
5126 | } | |
5127 | return res; | |
5128 | } | |
5129 | if (SCM_NULLP (SCM_CDR (args))) | |
5130 | { | |
5131 | SCM arg2 = SCM_CAR (args); | |
5132 | int len2 = scm_ilength (arg2); | |
5133 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5134 | SCM_GASSERTn (call, | |
5135 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5136 | SCM_GASSERTn (len2 >= 0, | |
5137 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5138 | if (len2 != len) | |
5139 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5140 | while (SCM_NIMP (arg1)) |
5141 | { | |
504d99c5 | 5142 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5143 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5144 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5145 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5146 | } |
5147 | return res; | |
5148 | } | |
05b15362 DH |
5149 | arg1 = scm_cons (arg1, args); |
5150 | args = scm_vector (arg1); | |
0f2d19dd | 5151 | ve = SCM_VELTS (args); |
47c3f06d | 5152 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5153 | while (1) |
5154 | { | |
5155 | arg1 = SCM_EOL; | |
b5c2579a | 5156 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5157 | { |
d9c393f5 JB |
5158 | if (SCM_IMP (ve[i])) |
5159 | return res; | |
0f2d19dd | 5160 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5161 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd | 5162 | } |
8ea46249 | 5163 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5164 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5165 | } |
5166 | } | |
af45e3b0 | 5167 | #undef FUNC_NAME |
0f2d19dd JB |
5168 | |
5169 | ||
47c3f06d | 5170 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5171 | |
0f2d19dd | 5172 | SCM |
1bbd0b84 | 5173 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5174 | #define FUNC_NAME s_for_each |
0f2d19dd | 5175 | { |
34d19ef6 | 5176 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
c014a02e | 5177 | long i, len; |
d9c393f5 | 5178 | len = scm_ilength (arg1); |
47c3f06d MD |
5179 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5180 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5181 | SCM_VALIDATE_REST_ARGUMENT (args); |
c96d76b8 | 5182 | if (SCM_NULLP (args)) |
0f2d19dd | 5183 | { |
504d99c5 MD |
5184 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5185 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5186 | while (SCM_NIMP (arg1)) | |
5187 | { | |
5188 | call (proc, SCM_CAR (arg1)); | |
5189 | arg1 = SCM_CDR (arg1); | |
5190 | } | |
5191 | return SCM_UNSPECIFIED; | |
5192 | } | |
5193 | if (SCM_NULLP (SCM_CDR (args))) | |
5194 | { | |
5195 | SCM arg2 = SCM_CAR (args); | |
5196 | int len2 = scm_ilength (arg2); | |
5197 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5198 | SCM_GASSERTn (call, g_for_each, | |
5199 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5200 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5201 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5202 | if (len2 != len) | |
5203 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5204 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5205 | { |
504d99c5 | 5206 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5207 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5208 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5209 | } |
5210 | return SCM_UNSPECIFIED; | |
5211 | } | |
05b15362 DH |
5212 | arg1 = scm_cons (arg1, args); |
5213 | args = scm_vector (arg1); | |
0f2d19dd | 5214 | ve = SCM_VELTS (args); |
47c3f06d | 5215 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5216 | while (1) |
5217 | { | |
5218 | arg1 = SCM_EOL; | |
b5c2579a | 5219 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5220 | { |
c96d76b8 NJ |
5221 | if (SCM_IMP (ve[i])) |
5222 | return SCM_UNSPECIFIED; | |
0f2d19dd | 5223 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5224 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd JB |
5225 | } |
5226 | scm_apply (proc, arg1, SCM_EOL); | |
5227 | } | |
5228 | } | |
af45e3b0 | 5229 | #undef FUNC_NAME |
0f2d19dd | 5230 | |
1cc91f1b | 5231 | |
0f2d19dd | 5232 | SCM |
6e8d25a6 | 5233 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5234 | { |
16d4699b MV |
5235 | SCM z; |
5236 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5237 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5238 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5239 | return z; |
5240 | } | |
5241 | ||
5242 | ||
92c2555f | 5243 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5244 | |
0f2d19dd | 5245 | SCM |
6e8d25a6 | 5246 | scm_makprom (SCM code) |
0f2d19dd | 5247 | { |
28d52ebb MD |
5248 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5249 | SCM_UNPACK (code), | |
5250 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
5251 | } |
5252 | ||
28d52ebb MD |
5253 | static size_t |
5254 | promise_free (SCM promise) | |
5255 | { | |
5256 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
5257 | return 0; | |
5258 | } | |
1cc91f1b | 5259 | |
0f2d19dd | 5260 | static int |
e841c3e0 | 5261 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5262 | { |
19402679 | 5263 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5264 | scm_puts ("#<promise ", port); |
19402679 | 5265 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5266 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5267 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5268 | scm_putc ('>', port); |
0f2d19dd JB |
5269 | return !0; |
5270 | } | |
5271 | ||
3b3b36dd | 5272 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5273 | (SCM promise), |
67e8151b MG |
5274 | "If the promise @var{x} has not been computed yet, compute and\n" |
5275 | "return @var{x}, otherwise just return the previously computed\n" | |
5276 | "value.") | |
1bbd0b84 | 5277 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5278 | { |
28d52ebb MD |
5279 | SCM_VALIDATE_SMOB (1, promise, promise); |
5280 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
5281 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5282 | { |
28d52ebb MD |
5283 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5284 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5285 | { |
28d52ebb MD |
5286 | SCM_SET_PROMISE_DATA (promise, ans); |
5287 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5288 | } |
5289 | } | |
28d52ebb MD |
5290 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
5291 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 5292 | } |
1bbd0b84 | 5293 | #undef FUNC_NAME |
0f2d19dd | 5294 | |
445f675c | 5295 | |
a1ec6916 | 5296 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5297 | (SCM obj), |
b380b885 | 5298 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5299 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5300 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5301 | { |
67e8151b | 5302 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5303 | } |
1bbd0b84 | 5304 | #undef FUNC_NAME |
0f2d19dd | 5305 | |
445f675c | 5306 | |
a1ec6916 | 5307 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5308 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5309 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5310 | "Any source properties associated with @var{xorig} are also associated\n" | |
5311 | "with the new pair.") | |
1bbd0b84 | 5312 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5313 | { |
5314 | SCM p, z; | |
16d4699b | 5315 | z = scm_cons (x, y); |
26d5b9b4 MD |
5316 | /* Copy source properties possibly associated with xorig. */ |
5317 | p = scm_whash_lookup (scm_source_whash, xorig); | |
445f675c | 5318 | if (!SCM_IMP (p)) |
26d5b9b4 MD |
5319 | scm_whash_insert (scm_source_whash, z, p); |
5320 | return z; | |
5321 | } | |
1bbd0b84 | 5322 | #undef FUNC_NAME |
26d5b9b4 | 5323 | |
445f675c | 5324 | |
62360b89 DH |
5325 | /* The function scm_copy_tree is used to copy an expression tree to allow the |
5326 | * memoizer to modify the expression during memoization. scm_copy_tree | |
5327 | * creates deep copies of pairs and vectors, but not of any other data types, | |
5328 | * since only pairs and vectors will be parsed by the memoizer. | |
5329 | * | |
5330 | * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise | |
5331 | * pattern is used to detect cycles. In fact, the pattern is used in two | |
5332 | * dimensions, vertical (indicated in the code by the variable names 'hare' | |
5333 | * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both | |
5334 | * dimensions, the hare/rabbit will take two steps when the tortoise/turtle | |
5335 | * takes one. | |
5336 | * | |
5337 | * The vertical dimension corresponds to recursive calls to function | |
5338 | * copy_tree: This happens when descending into vector elements, into cars of | |
5339 | * lists and into the cdr of an improper list. In this dimension, the | |
5340 | * tortoise follows the hare by using the processor stack: Every stack frame | |
5341 | * will hold an instance of struct t_trace. These instances are connected in | |
5342 | * a way that represents the trace of the hare, which thus can be followed by | |
5343 | * the tortoise. The tortoise will always point to struct t_trace instances | |
5344 | * relating to SCM objects that have already been copied. Thus, a cycle is | |
5345 | * detected if the tortoise and the hare point to the same object, | |
5346 | * | |
5347 | * The horizontal dimension is within one execution of copy_tree, when the | |
5348 | * function cdr's along the pairs of a list. This is the standard | |
5349 | * hare-and-tortoise implementation, found several times in guile. */ | |
5350 | ||
5351 | struct t_trace { | |
5352 | struct t_trace *trace; // These pointers form a trace along the stack. | |
5353 | SCM obj; // The object handled at the respective stack frame. | |
5354 | }; | |
5355 | ||
5356 | static SCM | |
5357 | copy_tree ( | |
5358 | struct t_trace *const hare, | |
5359 | struct t_trace *tortoise, | |
5360 | unsigned int tortoise_delay ) | |
5361 | { | |
5362 | if (!SCM_CONSP (hare->obj) && !SCM_VECTORP (hare->obj)) | |
5363 | { | |
5364 | return hare->obj; | |
5365 | } | |
5366 | else | |
5367 | { | |
5368 | /* Prepare the trace along the stack. */ | |
5369 | struct t_trace new_hare; | |
5370 | hare->trace = &new_hare; | |
5371 | ||
5372 | /* The tortoise will make its step after the delay has elapsed. Note | |
5373 | * that in contrast to the typical hare-and-tortoise pattern, the step | |
5374 | * of the tortoise happens before the hare takes its steps. This is, in | |
5375 | * principle, no problem, except for the start of the algorithm: Then, | |
5376 | * it has to be made sure that the hare actually gets its advantage by | |
5377 | * two steps. */ | |
5378 | if (tortoise_delay == 0) | |
5379 | { | |
5380 | tortoise_delay = 1; | |
5381 | tortoise = tortoise->trace; | |
5382 | ASSERT_SYNTAX (!SCM_EQ_P (hare->obj, tortoise->obj), | |
5383 | s_bad_expression, hare->obj); | |
5384 | } | |
5385 | else | |
5386 | { | |
5387 | --tortoise_delay; | |
5388 | } | |
5389 | ||
5390 | if (SCM_VECTORP (hare->obj)) | |
5391 | { | |
5392 | const unsigned long int length = SCM_VECTOR_LENGTH (hare->obj); | |
5393 | const SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED); | |
5394 | ||
5395 | /* Each vector element is copied by recursing into copy_tree, having | |
5396 | * the tortoise follow the hare into the depths of the stack. */ | |
5397 | unsigned long int i; | |
5398 | for (i = 0; i < length; ++i) | |
5399 | { | |
5400 | SCM new_element; | |
5401 | new_hare.obj = SCM_VECTOR_REF (hare->obj, i); | |
5402 | new_element = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5403 | SCM_VECTOR_SET (new_vector, i, new_element); | |
5404 | } | |
5405 | ||
5406 | return new_vector; | |
5407 | } | |
5408 | else // SCM_CONSP (hare->obj) | |
5409 | { | |
5410 | SCM result; | |
5411 | SCM tail; | |
5412 | ||
5413 | SCM rabbit = hare->obj; | |
5414 | SCM turtle = hare->obj; | |
5415 | ||
5416 | SCM copy; | |
5417 | ||
5418 | /* The first pair of the list is treated specially, in order to | |
5419 | * preserve a potential source code position. */ | |
5420 | result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL); | |
5421 | new_hare.obj = SCM_CAR (rabbit); | |
5422 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5423 | SCM_SETCAR (tail, copy); | |
5424 | ||
5425 | /* The remaining pairs of the list are copied by, horizontally, | |
5426 | * having the turtle follow the rabbit, and, vertically, having the | |
5427 | * tortoise follow the hare into the depths of the stack. */ | |
5428 | rabbit = SCM_CDR (rabbit); | |
5429 | while (SCM_CONSP (rabbit)) | |
5430 | { | |
5431 | new_hare.obj = SCM_CAR (rabbit); | |
5432 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5433 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5434 | tail = SCM_CDR (tail); | |
5435 | ||
5436 | rabbit = SCM_CDR (rabbit); | |
5437 | if (SCM_CONSP (rabbit)) | |
5438 | { | |
5439 | new_hare.obj = SCM_CAR (rabbit); | |
5440 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5441 | SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED)); | |
5442 | tail = SCM_CDR (tail); | |
5443 | rabbit = SCM_CDR (rabbit); | |
5444 | ||
5445 | turtle = SCM_CDR (turtle); | |
5446 | ASSERT_SYNTAX (!SCM_EQ_P (rabbit, turtle), | |
5447 | s_bad_expression, rabbit); | |
5448 | } | |
5449 | } | |
5450 | ||
5451 | /* We have to recurse into copy_tree again for the last cdr, in | |
5452 | * order to handle the situation that it holds a vector. */ | |
5453 | new_hare.obj = rabbit; | |
5454 | copy = copy_tree (&new_hare, tortoise, tortoise_delay); | |
5455 | SCM_SETCDR (tail, copy); | |
5456 | ||
5457 | return result; | |
5458 | } | |
5459 | } | |
5460 | } | |
5461 | ||
a1ec6916 | 5462 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5463 | (SCM obj), |
b380b885 | 5464 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
bfefbf18 | 5465 | "the new data structure. @code{copy-tree} recurses down the\n" |
b380b885 MD |
5466 | "contents of both pairs and vectors (since both cons cells and vector\n" |
5467 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5468 | "any other object.") | |
1bbd0b84 | 5469 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd | 5470 | { |
62360b89 DH |
5471 | /* Prepare the trace along the stack. */ |
5472 | struct t_trace trace; | |
5473 | trace.obj = obj; | |
5474 | ||
5475 | /* In function copy_tree, if the tortoise makes its step, it will do this | |
5476 | * before the hare has the chance to move. Thus, we have to make sure that | |
5477 | * the very first step of the tortoise will not happen after the hare has | |
5478 | * really made two steps. This is achieved by passing '2' as the initial | |
5479 | * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare | |
5480 | * a bigger advantage may improve performance slightly. */ | |
5481 | return copy_tree (&trace, &trace, 2); | |
0f2d19dd | 5482 | } |
1bbd0b84 | 5483 | #undef FUNC_NAME |
0f2d19dd | 5484 | |
1cc91f1b | 5485 | |
4163eb72 MV |
5486 | /* We have three levels of EVAL here: |
5487 | ||
5488 | - scm_i_eval (exp, env) | |
5489 | ||
5490 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5491 | structure as used by the actual tree code evaluator. When ENV is | |
5492 | a top-level environment, then changes to the current module are | |
a513ead3 | 5493 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5494 | the current module. |
5495 | ||
5496 | - scm_primitive_eval (exp) | |
5497 | ||
5498 | evaluates EXP in the top-level environment as determined by the | |
5499 | current module. This is done by constructing a suitable | |
5500 | environment and calling scm_i_eval. Thus, changes to the | |
5501 | top-level module are tracked normally. | |
5502 | ||
5503 | - scm_eval (exp, mod) | |
5504 | ||
a513ead3 | 5505 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
5506 | setting the current module to MOD, invoking scm_primitive_eval on |
5507 | EXP, and then restoring the current module to the value it had | |
5508 | previously. That is, while EXP is evaluated, changes to the | |
5509 | current module are tracked, but these changes do not persist when | |
5510 | scm_eval returns. | |
5511 | ||
5512 | For each level of evals, there are two variants, distinguished by a | |
5513 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5514 | variant can destructively modify EXP into something completely | |
5515 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5516 | _x variants should not ever be used again for anything. So when in | |
5517 | doubt, use the ordinary variant. | |
5518 | ||
5519 | */ | |
5520 | ||
0f2d19dd | 5521 | SCM |
68d8be66 | 5522 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5523 | { |
68d8be66 | 5524 | return SCM_XEVAL (exp, env); |
0f2d19dd JB |
5525 | } |
5526 | ||
68d8be66 MD |
5527 | SCM |
5528 | scm_i_eval (SCM exp, SCM env) | |
5529 | { | |
26fb6390 | 5530 | exp = scm_copy_tree (exp); |
e37a4fba | 5531 | return SCM_XEVAL (exp, env); |
68d8be66 MD |
5532 | } |
5533 | ||
5534 | SCM | |
4163eb72 | 5535 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5536 | { |
a513ead3 | 5537 | SCM env; |
bcdab802 | 5538 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5539 | if (SCM_NIMP (transformer)) |
fdc28395 | 5540 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5541 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5542 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5543 | } |
5544 | ||
4163eb72 MV |
5545 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5546 | (SCM exp), | |
2069af38 | 5547 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5548 | "the current module.") |
5549 | #define FUNC_NAME s_scm_primitive_eval | |
5550 | { | |
a513ead3 | 5551 | SCM env; |
bcdab802 | 5552 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5553 | if (SCM_NIMP (transformer)) |
fdc28395 | 5554 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5555 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5556 | return scm_i_eval (exp, env); |
5557 | } | |
5558 | #undef FUNC_NAME | |
5559 | ||
6bff1368 | 5560 | |
68d8be66 MD |
5561 | /* Eval does not take the second arg optionally. This is intentional |
5562 | * in order to be R5RS compatible, and to prepare for the new module | |
5563 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5564 | * environment explicit. */ |
549e6ec6 | 5565 | |
09074dbf DH |
5566 | static void |
5567 | change_environment (void *data) | |
5568 | { | |
5569 | SCM pair = SCM_PACK (data); | |
5570 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 5571 | SCM old_module = scm_current_module (); |
09074dbf | 5572 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 5573 | scm_set_current_module (new_module); |
09074dbf DH |
5574 | } |
5575 | ||
09074dbf DH |
5576 | static void |
5577 | restore_environment (void *data) | |
5578 | { | |
5579 | SCM pair = SCM_PACK (data); | |
5580 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 5581 | SCM new_module = scm_current_module (); |
2e9c835d | 5582 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 5583 | scm_set_current_module (old_module); |
09074dbf DH |
5584 | } |
5585 | ||
4163eb72 MV |
5586 | static SCM |
5587 | inner_eval_x (void *data) | |
5588 | { | |
5589 | return scm_primitive_eval_x (SCM_PACK(data)); | |
5590 | } | |
5591 | ||
5592 | SCM | |
5593 | scm_eval_x (SCM exp, SCM module) | |
5594 | #define FUNC_NAME "eval!" | |
5595 | { | |
5596 | SCM_VALIDATE_MODULE (2, module); | |
5597 | ||
5598 | return scm_internal_dynamic_wind | |
5599 | (change_environment, inner_eval_x, restore_environment, | |
5600 | (void *) SCM_UNPACK (exp), | |
5601 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
5602 | } | |
5603 | #undef FUNC_NAME | |
5604 | ||
5605 | static SCM | |
5606 | inner_eval (void *data) | |
5607 | { | |
5608 | return scm_primitive_eval (SCM_PACK(data)); | |
5609 | } | |
09074dbf | 5610 | |
68d8be66 | 5611 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
5612 | (SCM exp, SCM module), |
5613 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
5614 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 5615 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
5616 | "@var{module} is made the current module. The current module\n" |
5617 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 5618 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5619 | { |
4163eb72 | 5620 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
5621 | |
5622 | return scm_internal_dynamic_wind | |
5623 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
5624 | (void *) SCM_UNPACK (exp), |
5625 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 5626 | } |
1bbd0b84 | 5627 | #undef FUNC_NAME |
0f2d19dd | 5628 | |
6dbd0af5 MD |
5629 | |
5630 | /* At this point, scm_deval and scm_dapply are generated. | |
5631 | */ | |
5632 | ||
a44a9715 DH |
5633 | #define DEVAL |
5634 | #include "eval.c" | |
0f2d19dd | 5635 | |
1cc91f1b | 5636 | |
0f2d19dd JB |
5637 | void |
5638 | scm_init_eval () | |
0f2d19dd | 5639 | { |
33b97402 MD |
5640 | scm_init_opts (scm_evaluator_traps, |
5641 | scm_evaluator_trap_table, | |
5642 | SCM_N_EVALUATOR_TRAPS); | |
5643 | scm_init_opts (scm_eval_options_interface, | |
5644 | scm_eval_opts, | |
5645 | SCM_N_EVAL_OPTIONS); | |
5646 | ||
f99c9c28 MD |
5647 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
5648 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 5649 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 5650 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 5651 | |
a44a9715 DH |
5652 | undefineds = scm_list_1 (SCM_UNDEFINED); |
5653 | SCM_SETCDR (undefineds, undefineds); | |
5654 | scm_permanent_object (undefineds); | |
7c33806a | 5655 | |
a44a9715 | 5656 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 5657 | |
a44a9715 DH |
5658 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
5659 | scm_permanent_object (f_apply); | |
86d31dfe | 5660 | |
a0599745 | 5661 | #include "libguile/eval.x" |
60a49842 | 5662 | |
25eaf21a | 5663 | scm_add_feature ("delay"); |
0f2d19dd | 5664 | } |
0f2d19dd | 5665 | |
6dbd0af5 | 5666 | #endif /* !DEVAL */ |
89e00824 ML |
5667 | |
5668 | /* | |
5669 | Local Variables: | |
5670 | c-file-style: "gnu" | |
5671 | End: | |
5672 | */ |