Commit | Line | Data |
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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 | ||
6dbd0af5 MD |
456 | /* The evaluator contains a plethora of EVAL symbols. |
457 | * This is an attempt at explanation. | |
458 | * | |
459 | * The following macros should be used in code which is read twice | |
460 | * (where the choice of evaluator is hard soldered): | |
461 | * | |
462 | * SCM_CEVAL is the symbol used within one evaluator to call itself. | |
463 | * Originally, it is defined to scm_ceval, but is redefined to | |
464 | * scm_deval during the second pass. | |
465 | * | |
6cb702da | 466 | * SCM_EVALIM is used when it is known that the expression is an |
6dbd0af5 MD |
467 | * immediate. (This macro never calls an evaluator.) |
468 | * | |
469 | * EVALCAR evaluates the car of an expression. | |
470 | * | |
6dbd0af5 MD |
471 | * The following macros should be used in code which is read once |
472 | * (where the choice of evaluator is dynamic): | |
473 | * | |
6cb702da | 474 | * SCM_XEVAL takes care of immediates without calling an evaluator. It |
6dbd0af5 MD |
475 | * then calls scm_ceval *or* scm_deval, depending on the debugging |
476 | * mode. | |
477 | * | |
6cb702da | 478 | * SCM_XEVALCAR corresponds to EVALCAR, but uses scm_ceval *or* scm_deval |
6dbd0af5 MD |
479 | * depending on the debugging mode. |
480 | * | |
481 | * The main motivation for keeping this plethora is efficiency | |
482 | * together with maintainability (=> locality of code). | |
483 | */ | |
484 | ||
6cb702da | 485 | #define SCM_CEVAL scm_ceval |
0f2d19dd | 486 | |
e90c3a89 DH |
487 | #define SCM_EVALIM2(x) \ |
488 | ((SCM_EQ_P ((x), SCM_EOL) \ | |
89bff2fc | 489 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ |
e90c3a89 DH |
490 | : 0), \ |
491 | (x)) | |
492 | ||
493 | #define SCM_EVALIM(x, env) (SCM_ILOCP (x) \ | |
494 | ? *scm_ilookup ((x), env) \ | |
495 | : SCM_EVALIM2(x)) | |
496 | ||
497 | #define SCM_XEVAL(x, env) (SCM_IMP (x) \ | |
498 | ? SCM_EVALIM2(x) \ | |
499 | : (*scm_ceval_ptr) ((x), (env))) | |
500 | ||
501 | #define SCM_XEVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ | |
502 | ? SCM_EVALIM (SCM_CAR (x), env) \ | |
503 | : (SCM_SYMBOLP (SCM_CAR (x)) \ | |
504 | ? *scm_lookupcar (x, env, 1) \ | |
505 | : (*scm_ceval_ptr) (SCM_CAR (x), env))) | |
506 | ||
8c494e99 | 507 | #define EVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ |
904a077d | 508 | ? SCM_EVALIM (SCM_CAR (x), env) \ |
680516ba DH |
509 | : (SCM_SYMBOLP (SCM_CAR (x)) \ |
510 | ? *scm_lookupcar (x, env, 1) \ | |
511 | : SCM_CEVAL (SCM_CAR (x), env))) | |
0f2d19dd | 512 | |
28d52ebb | 513 | SCM_REC_MUTEX (source_mutex); |
9bc4701c | 514 | |
12841895 DH |
515 | |
516 | /* Lookup a given local variable in an environment. The local variable is | |
517 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
518 | * indicates the relative number of the environment frame (counting upwards | |
519 | * from the innermost environment frame), binding indicates the number of the | |
520 | * binding within the frame, and last? (which is extracted from the iloc using | |
521 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
522 | * very end of the improper list of bindings. */ | |
0f2d19dd | 523 | SCM * |
6e8d25a6 | 524 | scm_ilookup (SCM iloc, SCM env) |
0f2d19dd | 525 | { |
12841895 DH |
526 | unsigned int frame_nr = SCM_IFRAME (iloc); |
527 | unsigned int binding_nr = SCM_IDIST (iloc); | |
528 | SCM frames = env; | |
529 | SCM bindings; | |
530 | ||
531 | for (; 0 != frame_nr; --frame_nr) | |
532 | frames = SCM_CDR (frames); | |
533 | ||
534 | bindings = SCM_CAR (frames); | |
535 | for (; 0 != binding_nr; --binding_nr) | |
536 | bindings = SCM_CDR (bindings); | |
537 | ||
0f2d19dd | 538 | if (SCM_ICDRP (iloc)) |
12841895 DH |
539 | return SCM_CDRLOC (bindings); |
540 | return SCM_CARLOC (SCM_CDR (bindings)); | |
0f2d19dd | 541 | } |
0f2d19dd | 542 | |
12841895 | 543 | |
89bff2fc DH |
544 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); |
545 | ||
546 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
547 | static void | |
548 | error_unbound_variable (SCM symbol) | |
549 | { | |
550 | scm_error (scm_unbound_variable_key, NULL, | |
551 | "Unbound variable: ~S", | |
552 | scm_list_1 (symbol), SCM_BOOL_F); | |
553 | } | |
554 | ||
555 | ||
f8769b1d MV |
556 | /* The Lookup Car Race |
557 | - by Eva Luator | |
558 | ||
559 | Memoization of variables and special forms is done while executing | |
560 | the code for the first time. As long as there is only one thread | |
561 | everything is fine, but as soon as two threads execute the same | |
562 | code concurrently `for the first time' they can come into conflict. | |
563 | ||
564 | This memoization includes rewriting variable references into more | |
565 | efficient forms and expanding macros. Furthermore, macro expansion | |
566 | includes `compiling' special forms like `let', `cond', etc. into | |
567 | tree-code instructions. | |
568 | ||
569 | There shouldn't normally be a problem with memoizing local and | |
904a077d | 570 | global variable references (into ilocs and variables), because all |
f8769b1d MV |
571 | threads will mutate the code in *exactly* the same way and (if I |
572 | read the C code correctly) it is not possible to observe a half-way | |
573 | mutated cons cell. The lookup procedure can handle this | |
574 | transparently without any critical sections. | |
575 | ||
576 | It is different with macro expansion, because macro expansion | |
577 | happens outside of the lookup procedure and can't be | |
904a077d MV |
578 | undone. Therefore the lookup procedure can't cope with it. It has |
579 | to indicate failure when it detects a lost race and hope that the | |
580 | caller can handle it. Luckily, it turns out that this is the case. | |
f8769b1d | 581 | |
904a077d | 582 | An example to illustrate this: Suppose that the following form will |
f8769b1d MV |
583 | be memoized concurrently by two threads |
584 | ||
585 | (let ((x 12)) x) | |
586 | ||
587 | Let's first examine the lookup of X in the body. The first thread | |
588 | decides that it has to find the symbol "x" in the environment and | |
589 | starts to scan it. Then the other thread takes over and actually | |
590 | overtakes the first. It looks up "x" and substitutes an | |
591 | appropriate iloc for it. Now the first thread continues and | |
592 | completes its lookup. It comes to exactly the same conclusions as | |
593 | the second one and could - without much ado - just overwrite the | |
594 | iloc with the same iloc. | |
595 | ||
596 | But let's see what will happen when the race occurs while looking | |
597 | up the symbol "let" at the start of the form. It could happen that | |
598 | the second thread interrupts the lookup of the first thread and not | |
904a077d MV |
599 | only substitutes a variable for it but goes right ahead and |
600 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
601 | the first thread completes its lookup, it would replace the #@let* | |
602 | with a variable containing the "let" binding, effectively reverting | |
603 | the form to (let (x 12) x). This is wrong. It has to detect that | |
604 | it has lost the race and the evaluator has to reconsider the | |
605 | changed form completely. | |
f8769b1d MV |
606 | |
607 | This race condition could be resolved with some kind of traffic | |
608 | light (like mutexes) around scm_lookupcar, but I think that it is | |
609 | best to avoid them in this case. They would serialize memoization | |
610 | completely and because lookup involves calling arbitrary Scheme | |
611 | code (via the lookup-thunk), threads could be blocked for an | |
612 | arbitrary amount of time or even deadlock. But with the current | |
613 | solution a lot of unnecessary work is potentially done. */ | |
614 | ||
9aa82b39 | 615 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to |
f8769b1d MV |
616 | return NULL to indicate a failed lookup due to some race conditions |
617 | between threads. This only happens when VLOC is the first cell of | |
618 | a special form that will eventually be memoized (like `let', etc.) | |
619 | In that case the whole lookup is bogus and the caller has to | |
620 | reconsider the complete special form. | |
621 | ||
622 | SCM_LOOKUPCAR is still there, of course. It just calls | |
de513fa0 | 623 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR |
f8769b1d MV |
624 | should only be called when it is known that VLOC is not the first |
625 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
26d5b9b4 MD |
626 | for NULL. I think I've found the only places where this |
627 | applies. */ | |
f8769b1d | 628 | |
8ecf1f13 | 629 | static SCM * |
26d5b9b4 | 630 | scm_lookupcar1 (SCM vloc, SCM genv, int check) |
0f2d19dd JB |
631 | { |
632 | SCM env = genv; | |
e3173f93 | 633 | register SCM *al, fl, var = SCM_CAR (vloc); |
0f2d19dd | 634 | register SCM iloc = SCM_ILOC00; |
0f2d19dd JB |
635 | for (; SCM_NIMP (env); env = SCM_CDR (env)) |
636 | { | |
790071cd | 637 | if (!SCM_CONSP (SCM_CAR (env))) |
0f2d19dd | 638 | break; |
a23afe53 | 639 | al = SCM_CARLOC (env); |
0f2d19dd JB |
640 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) |
641 | { | |
01f11e02 | 642 | if (!SCM_CONSP (fl)) |
33b97402 | 643 | { |
cf498326 | 644 | if (SCM_EQ_P (fl, var)) |
0f2d19dd | 645 | { |
cf498326 | 646 | if (! SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 647 | goto race; |
3201d763 | 648 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); |
a23afe53 | 649 | return SCM_CDRLOC (*al); |
0f2d19dd | 650 | } |
33b97402 MD |
651 | else |
652 | break; | |
653 | } | |
a23afe53 | 654 | al = SCM_CDRLOC (*al); |
cf498326 | 655 | if (SCM_EQ_P (SCM_CAR (fl), var)) |
0f2d19dd | 656 | { |
0f2d19dd JB |
657 | if (SCM_UNBNDP (SCM_CAR (*al))) |
658 | { | |
659 | env = SCM_EOL; | |
660 | goto errout; | |
661 | } | |
c6772927 | 662 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 663 | goto race; |
a23afe53 | 664 | SCM_SETCAR (vloc, iloc); |
a23afe53 | 665 | return SCM_CARLOC (*al); |
0f2d19dd | 666 | } |
3201d763 | 667 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); |
0f2d19dd | 668 | } |
3201d763 | 669 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); |
0f2d19dd JB |
670 | } |
671 | { | |
86d31dfe | 672 | SCM top_thunk, real_var; |
790071cd | 673 | if (SCM_NIMP (env)) |
0f2d19dd | 674 | { |
86d31dfe MV |
675 | top_thunk = SCM_CAR (env); /* env now refers to a |
676 | top level env thunk */ | |
0f2d19dd JB |
677 | env = SCM_CDR (env); |
678 | } | |
679 | else | |
680 | top_thunk = SCM_BOOL_F; | |
86d31dfe MV |
681 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); |
682 | if (SCM_FALSEP (real_var)) | |
0f2d19dd | 683 | goto errout; |
86d31dfe | 684 | |
01f11e02 | 685 | if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
86d31dfe MV |
686 | { |
687 | errout: | |
86d31dfe MV |
688 | if (check) |
689 | { | |
690 | if (SCM_NULLP (env)) | |
89bff2fc | 691 | error_unbound_variable (var); |
86d31dfe MV |
692 | else |
693 | scm_misc_error (NULL, "Damaged environment: ~S", | |
8ea46249 | 694 | scm_list_1 (var)); |
86d31dfe MV |
695 | } |
696 | else | |
697 | { | |
698 | /* A variable could not be found, but we shall | |
699 | not throw an error. */ | |
700 | static SCM undef_object = SCM_UNDEFINED; | |
701 | return &undef_object; | |
702 | } | |
09e4d064 | 703 | } |
86d31dfe | 704 | |
c6772927 | 705 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
86d31dfe MV |
706 | { |
707 | /* Some other thread has changed the very cell we are working | |
708 | on. In effect, it must have done our job or messed it up | |
709 | completely. */ | |
710 | race: | |
711 | var = SCM_CAR (vloc); | |
d22a0ea1 MV |
712 | if (SCM_VARIABLEP (var)) |
713 | return SCM_VARIABLE_LOC (var); | |
86d31dfe MV |
714 | if (SCM_ITAG7 (var) == SCM_ITAG7 (SCM_ILOC00)) |
715 | return scm_ilookup (var, genv); | |
904a077d | 716 | /* We can't cope with anything else than variables and ilocs. When |
86d31dfe MV |
717 | a special form has been memoized (i.e. `let' into `#@let') we |
718 | return NULL and expect the calling function to do the right | |
719 | thing. For the evaluator, this means going back and redoing | |
720 | the dispatch on the car of the form. */ | |
721 | return NULL; | |
722 | } | |
f8769b1d | 723 | |
d22a0ea1 | 724 | SCM_SETCAR (vloc, real_var); |
86d31dfe MV |
725 | return SCM_VARIABLE_LOC (real_var); |
726 | } | |
0f2d19dd JB |
727 | } |
728 | ||
f8769b1d | 729 | SCM * |
6e8d25a6 | 730 | scm_lookupcar (SCM vloc, SCM genv, int check) |
f8769b1d | 731 | { |
26d5b9b4 | 732 | SCM *loc = scm_lookupcar1 (vloc, genv, check); |
f8769b1d MV |
733 | if (loc == NULL) |
734 | abort (); | |
735 | return loc; | |
736 | } | |
f8769b1d | 737 | |
1cc91f1b | 738 | |
0f2d19dd | 739 | SCM |
6e8d25a6 | 740 | scm_eval_car (SCM pair, SCM env) |
0f2d19dd | 741 | { |
6cb702da | 742 | return SCM_XEVALCAR (pair, env); |
0f2d19dd JB |
743 | } |
744 | ||
745 | \f | |
0f2d19dd | 746 | |
34adf7ea DH |
747 | /* Rewrite the body (which is given as the list of expressions forming the |
748 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
749 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
750 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
751 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
6bff1368 | 752 | * SCM_IM_LET, etc. |
34adf7ea DH |
753 | * |
754 | * It is assumed that the calling expression has already made sure that the | |
755 | * body is a proper list. */ | |
26d5b9b4 | 756 | static SCM |
430b8401 | 757 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 758 | { |
26d5b9b4 | 759 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
760 | if (SCM_ISYMP (SCM_CAR (exprs))) |
761 | return exprs; | |
762 | else | |
763 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
764 | } |
765 | ||
1cc91f1b | 766 | |
9d4bf6d3 MV |
767 | /* The function m_expand_body memoizes a proper list of expressions |
768 | * forming a body. This function takes care of dealing with internal | |
769 | * defines and transforming them into an equivalent letrec expression. | |
770 | * The list of expressions is rewritten in place. */ | |
910b5125 DH |
771 | |
772 | /* This is a helper function for m_expand_body. It helps to figure out whether | |
773 | * an expression denotes a syntactic keyword. */ | |
774 | static SCM | |
775 | try_macro_lookup (const SCM expr, const SCM env) | |
776 | { | |
777 | if (SCM_SYMBOLP (expr)) | |
778 | { | |
6f81708a | 779 | const SCM value = lookup_symbol (expr, env); |
910b5125 DH |
780 | return value; |
781 | } | |
782 | else | |
783 | { | |
784 | return SCM_UNDEFINED; | |
785 | } | |
786 | } | |
787 | ||
788 | /* This is a helper function for m_expand_body. It expands user macros, | |
789 | * because for the correct translation of a body we need to know whether they | |
790 | * expand to a definition. */ | |
791 | static SCM | |
792 | expand_user_macros (SCM expr, const SCM env) | |
793 | { | |
794 | while (SCM_CONSP (expr)) | |
795 | { | |
796 | const SCM car_expr = SCM_CAR (expr); | |
797 | const SCM new_car = expand_user_macros (car_expr, env); | |
798 | const SCM value = try_macro_lookup (new_car, env); | |
799 | ||
800 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
801 | { | |
802 | /* User macros transform code into code. */ | |
803 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
804 | /* We need to reiterate on the transformed code. */ | |
805 | } | |
806 | else | |
807 | { | |
808 | /* No user macro: return. */ | |
809 | SCM_SETCAR (expr, new_car); | |
810 | return expr; | |
811 | } | |
812 | } | |
813 | ||
814 | return expr; | |
815 | } | |
816 | ||
817 | /* This is a helper function for m_expand_body. It determines if a given form | |
818 | * represents an application of a given built-in macro. The built-in macro to | |
819 | * check for is identified by its syntactic keyword. The form is an | |
820 | * application of the given macro if looking up the car of the form in the | |
821 | * given environment actually returns the built-in macro. */ | |
822 | static int | |
823 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
824 | { | |
825 | if (SCM_CONSP (form)) | |
826 | { | |
827 | const SCM car_form = SCM_CAR (form); | |
828 | const SCM value = try_macro_lookup (car_form, env); | |
829 | if (SCM_BUILTIN_MACRO_P (value)) | |
830 | { | |
831 | const SCM macro_name = scm_macro_name (value); | |
832 | return SCM_EQ_P (macro_name, syntactic_keyword); | |
833 | } | |
834 | } | |
835 | ||
836 | return 0; | |
837 | } | |
838 | ||
9d4bf6d3 | 839 | static void |
910b5125 DH |
840 | m_expand_body (const SCM forms, const SCM env) |
841 | { | |
842 | /* The first body form can be skipped since it is known to be the ISYM that | |
843 | * was prepended to the body by m_body. */ | |
844 | SCM cdr_forms = SCM_CDR (forms); | |
845 | SCM form_idx = cdr_forms; | |
846 | SCM definitions = SCM_EOL; | |
847 | SCM sequence = SCM_EOL; | |
848 | ||
849 | /* According to R5RS, the list of body forms consists of two parts: a number | |
850 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
851 | * expressions. Each the definitions and the expressions may be grouped | |
852 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
853 | * expressions. The task of the following loop therefore is to split the | |
854 | * list of body forms into the list of definitions and the sequence of | |
855 | * expressions. */ | |
856 | while (!SCM_NULLP (form_idx)) | |
857 | { | |
858 | const SCM form = SCM_CAR (form_idx); | |
859 | const SCM new_form = expand_user_macros (form, env); | |
860 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
861 | { | |
862 | definitions = scm_cons (new_form, definitions); | |
863 | form_idx = SCM_CDR (form_idx); | |
864 | } | |
865 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
866 | { | |
867 | /* We have encountered a group of forms. This has to be either a | |
868 | * (possibly empty) group of (possibly further grouped) definitions, | |
869 | * or a non-empty group of (possibly further grouped) | |
870 | * expressions. */ | |
871 | const SCM grouped_forms = SCM_CDR (new_form); | |
872 | unsigned int found_definition = 0; | |
873 | unsigned int found_expression = 0; | |
874 | SCM grouped_form_idx = grouped_forms; | |
875 | while (!found_expression && !SCM_NULLP (grouped_form_idx)) | |
876 | { | |
877 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
878 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
879 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
880 | { | |
881 | found_definition = 1; | |
882 | definitions = scm_cons (new_inner_form, definitions); | |
883 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
884 | } | |
885 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
886 | { | |
887 | const SCM inner_group = SCM_CDR (new_inner_form); | |
888 | grouped_form_idx | |
889 | = scm_append (scm_list_2 (inner_group, | |
890 | SCM_CDR (grouped_form_idx))); | |
891 | } | |
892 | else | |
893 | { | |
894 | /* The group marks the start of the expressions of the body. | |
895 | * We have to make sure that within the same group we have | |
896 | * not encountered a definition before. */ | |
897 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
898 | found_expression = 1; | |
899 | grouped_form_idx = SCM_EOL; | |
900 | } | |
901 | } | |
902 | ||
903 | /* We have finished processing the group. If we have not yet | |
904 | * encountered an expression we continue processing the forms of the | |
905 | * body to collect further definition forms. Otherwise, the group | |
906 | * marks the start of the sequence of expressions of the body. */ | |
907 | if (!found_expression) | |
908 | { | |
909 | form_idx = SCM_CDR (form_idx); | |
910 | } | |
911 | else | |
912 | { | |
913 | sequence = form_idx; | |
914 | form_idx = SCM_EOL; | |
915 | } | |
916 | } | |
917 | else | |
918 | { | |
919 | /* We have detected a form which is no definition. This marks the | |
920 | * start of the sequence of expressions of the body. */ | |
921 | sequence = form_idx; | |
922 | form_idx = SCM_EOL; | |
923 | } | |
924 | } | |
925 | ||
926 | /* FIXME: forms does not hold information about the file location. */ | |
927 | ASSERT_SYNTAX (SCM_CONSP (sequence), s_missing_body_expression, cdr_forms); | |
928 | ||
929 | if (!SCM_NULLP (definitions)) | |
930 | { | |
931 | SCM definition_idx; | |
932 | SCM letrec_tail; | |
933 | SCM letrec_expression; | |
934 | SCM new_letrec_expression; | |
910b5125 DH |
935 | |
936 | SCM bindings = SCM_EOL; | |
937 | for (definition_idx = definitions; | |
938 | !SCM_NULLP (definition_idx); | |
939 | definition_idx = SCM_CDR (definition_idx)) | |
940 | { | |
941 | const SCM definition = SCM_CAR (definition_idx); | |
942 | const SCM canonical_definition = canonicalize_define (definition); | |
943 | const SCM binding = SCM_CDR (canonical_definition); | |
944 | bindings = scm_cons (binding, bindings); | |
945 | }; | |
946 | ||
947 | letrec_tail = scm_cons (bindings, sequence); | |
948 | /* FIXME: forms does not hold information about the file location. */ | |
949 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
950 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
9d4bf6d3 MV |
951 | SCM_SETCAR (forms, new_letrec_expression); |
952 | SCM_SETCDR (forms, SCM_EOL); | |
910b5125 DH |
953 | } |
954 | else | |
955 | { | |
956 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
957 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
910b5125 DH |
958 | } |
959 | } | |
960 | ||
961 | #if (SCM_ENABLE_DEPRECATED == 1) | |
962 | ||
963 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ | |
964 | SCM | |
965 | scm_m_expand_body (SCM exprs, SCM env) | |
966 | { | |
967 | scm_c_issue_deprecation_warning | |
968 | ("`scm_m_expand_body' is deprecated."); | |
9d4bf6d3 MV |
969 | m_expand_body (exprs, env); |
970 | return exprs; | |
910b5125 DH |
971 | } |
972 | ||
973 | #endif | |
974 | ||
975 | ||
9fbee57e | 976 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
977 | |
978 | ||
3b88ed2a | 979 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 980 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 981 | |
8ea46249 | 982 | SCM |
e6729603 | 983 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 984 | { |
e6729603 DH |
985 | const SCM cdr_expr = SCM_CDR (expr); |
986 | const long length = scm_ilength (cdr_expr); | |
987 | ||
988 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
989 | ||
990 | if (length == 0) | |
991 | { | |
992 | /* Special case: (and) is replaced by #t. */ | |
993 | return SCM_BOOL_T; | |
994 | } | |
0f2d19dd | 995 | else |
e6729603 DH |
996 | { |
997 | SCM_SETCAR (expr, SCM_IM_AND); | |
998 | return expr; | |
999 | } | |
0f2d19dd JB |
1000 | } |
1001 | ||
1cc91f1b | 1002 | |
3b88ed2a | 1003 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 1004 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
1005 | |
1006 | SCM | |
2a6f7afe | 1007 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1008 | { |
2a6f7afe | 1009 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
1010 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
1011 | * That means, there should be a distinction between uses of begin where an | |
1012 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
1013 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
1014 | ||
1015 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
1016 | return expr; | |
0f2d19dd JB |
1017 | } |
1018 | ||
1019 | ||
3b88ed2a | 1020 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 1021 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 1022 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 1023 | |
8ea46249 | 1024 | SCM |
2a6f7afe | 1025 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 1026 | { |
8ea46249 | 1027 | SCM clauses; |
2a6f7afe DH |
1028 | SCM all_labels = SCM_EOL; |
1029 | ||
1030 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
1031 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1032 | ||
1033 | const SCM cdr_expr = SCM_CDR (expr); | |
1034 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1035 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
1036 | ||
1037 | clauses = SCM_CDR (cdr_expr); | |
8ea46249 | 1038 | while (!SCM_NULLP (clauses)) |
0f2d19dd | 1039 | { |
2a6f7afe DH |
1040 | SCM labels; |
1041 | ||
1042 | const SCM clause = SCM_CAR (clauses); | |
1043 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
1044 | s_bad_case_clause, clause, expr); | |
1045 | ||
1046 | labels = SCM_CAR (clause); | |
1047 | if (SCM_CONSP (labels)) | |
1048 | { | |
1049 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
1050 | s_bad_case_labels, labels, expr); | |
1051 | all_labels = scm_append_x (scm_list_2 (labels, all_labels)); | |
1052 | } | |
58a2510b DH |
1053 | else if (SCM_NULLP (labels)) |
1054 | { | |
1055 | /* The list of labels is empty. According to R5RS this is allowed. | |
1056 | * It means that the sequence of expressions will never be executed. | |
1057 | * Therefore, as an optimization, we could remove the whole | |
1058 | * clause. */ | |
1059 | } | |
2a6f7afe DH |
1060 | else |
1061 | { | |
1062 | ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p, | |
1063 | s_bad_case_labels, labels, expr); | |
1064 | ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)), | |
609a8b86 | 1065 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
1066 | } |
1067 | ||
1068 | /* build the new clause */ | |
1069 | if (SCM_EQ_P (labels, scm_sym_else)) | |
1070 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
1071 | ||
8ea46249 | 1072 | clauses = SCM_CDR (clauses); |
0f2d19dd | 1073 | } |
2a6f7afe DH |
1074 | |
1075 | /* Check whether all case labels are distinct. */ | |
1076 | for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels)) | |
1077 | { | |
1078 | const SCM label = SCM_CAR (all_labels); | |
4610b011 DH |
1079 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (label, SCM_CDR (all_labels))), |
1080 | s_duplicate_case_label, label, expr); | |
2a6f7afe DH |
1081 | } |
1082 | ||
1083 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1084 | return expr; | |
0f2d19dd JB |
1085 | } |
1086 | ||
1087 | ||
3b88ed2a | 1088 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1089 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1090 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1091 | |
8ea46249 | 1092 | SCM |
609a8b86 | 1093 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1094 | { |
609a8b86 DH |
1095 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1096 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1097 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1098 | ||
1099 | const SCM clauses = SCM_CDR (expr); | |
1100 | SCM clause_idx; | |
1101 | ||
1102 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1103 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1104 | ||
1105 | for (clause_idx = clauses; | |
1106 | !SCM_NULLP (clause_idx); | |
1107 | clause_idx = SCM_CDR (clause_idx)) | |
0f2d19dd | 1108 | { |
609a8b86 DH |
1109 | SCM test; |
1110 | ||
1111 | const SCM clause = SCM_CAR (clause_idx); | |
1112 | const long length = scm_ilength (clause); | |
1113 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1114 | ||
1115 | test = SCM_CAR (clause); | |
1116 | if (SCM_EQ_P (test, scm_sym_else) && else_literal_p) | |
0f2d19dd | 1117 | { |
609a8b86 DH |
1118 | const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx)); |
1119 | ASSERT_SYNTAX_2 (length >= 2, | |
1120 | s_bad_cond_clause, clause, expr); | |
1121 | ASSERT_SYNTAX_2 (last_clause_p, | |
1122 | s_misplaced_else_clause, clause, expr); | |
1123 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1124 | } |
609a8b86 DH |
1125 | else if (length >= 2 |
1126 | && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow) | |
1127 | && arrow_literal_p) | |
1128 | { | |
1129 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1130 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1131 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1132 | } |
0f2d19dd | 1133 | } |
609a8b86 DH |
1134 | |
1135 | SCM_SETCAR (expr, SCM_IM_COND); | |
1136 | return expr; | |
0f2d19dd JB |
1137 | } |
1138 | ||
1cc91f1b | 1139 | |
0f572ba7 DH |
1140 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1141 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1142 | |
9fbee57e DH |
1143 | /* Guile provides an extension to R5RS' define syntax to represent function |
1144 | * currying in a compact way. With this extension, it is allowed to write | |
1145 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1146 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1147 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1148 | * should be either a sequence of zero or more variables, or a sequence of one | |
1149 | * or more variables followed by a space-delimited period and another | |
1150 | * variable. Each level of argument nesting wraps the <body> within another | |
1151 | * lambda expression. For example, the following forms are allowed, each one | |
1152 | * followed by an equivalent, more explicit implementation. | |
1153 | * Example 1: | |
1154 | * (define ((a b . c) . d) <body>) is equivalent to | |
1155 | * (define a (lambda (b . c) (lambda d <body>))) | |
1156 | * Example 2: | |
1157 | * (define (((a) b) c . d) <body>) is equivalent to | |
1158 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1159 | */ | |
1160 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1161 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1162 | static SCM |
1163 | canonicalize_define (const SCM expr) | |
5280aaca | 1164 | { |
cc56ba80 DH |
1165 | SCM body; |
1166 | SCM variable; | |
1167 | ||
1168 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1169 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1170 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1171 | ||
1172 | body = SCM_CDR (cdr_expr); | |
1173 | variable = SCM_CAR (cdr_expr); | |
1174 | while (SCM_CONSP (variable)) | |
5280aaca | 1175 | { |
cc56ba80 DH |
1176 | /* This while loop realizes function currying by variable nesting. |
1177 | * Variable is known to be a nested-variable. In every iteration of the | |
1178 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1179 | * innermost one. Note that we don't check for duplicate formals here: |
1180 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1181 | const SCM formals = SCM_CDR (variable); |
1182 | const SCM tail = scm_cons (formals, body); | |
1183 | ||
1184 | /* Add source properties to each new lambda expression: */ | |
1185 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1186 | ||
1187 | body = scm_list_1 (lambda); | |
1188 | variable = SCM_CAR (variable); | |
5280aaca | 1189 | } |
cc56ba80 DH |
1190 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); |
1191 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
1192 | ||
0f572ba7 DH |
1193 | SCM_SETCAR (cdr_expr, variable); |
1194 | SCM_SETCDR (cdr_expr, body); | |
1195 | return expr; | |
1196 | } | |
1197 | ||
1198 | SCM | |
1199 | scm_m_define (SCM expr, SCM env) | |
1200 | { | |
6bff1368 | 1201 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr); |
0f572ba7 | 1202 | |
6bff1368 DH |
1203 | { |
1204 | const SCM canonical_definition = canonicalize_define (expr); | |
1205 | const SCM cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1206 | const SCM variable = SCM_CAR (cdr_canonical_definition); | |
1207 | const SCM body = SCM_CDR (cdr_canonical_definition); | |
1208 | const SCM value = scm_eval_car (body, env); | |
1209 | ||
1210 | SCM var; | |
1211 | if (SCM_REC_PROCNAMES_P) | |
1212 | { | |
1213 | SCM tmp = value; | |
1214 | while (SCM_MACROP (tmp)) | |
1215 | tmp = SCM_MACRO_CODE (tmp); | |
1216 | if (SCM_CLOSUREP (tmp) | |
1217 | /* Only the first definition determines the name. */ | |
1218 | && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name))) | |
1219 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); | |
1220 | } | |
0f572ba7 | 1221 | |
6bff1368 DH |
1222 | var = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); |
1223 | SCM_VARIABLE_SET (var, value); | |
1224 | ||
1225 | return SCM_UNSPECIFIED; | |
1226 | } | |
0f2d19dd JB |
1227 | } |
1228 | ||
1229 | ||
8ae95199 DH |
1230 | /* This is a helper function for forms (<keyword> <expression>) that are |
1231 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1232 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1233 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1234 | static SCM | |
1235 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1236 | { | |
1237 | const SCM cdr_expr = SCM_CDR (expr); | |
1238 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1239 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1240 | ||
1241 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1242 | ||
1243 | return expr; | |
1244 | } | |
1245 | ||
1246 | ||
3b88ed2a | 1247 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1248 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1249 | |
9fbee57e DH |
1250 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1251 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1252 | * the empty list represents the empty parameter list. This representation | |
1253 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1254 | SCM |
8ae95199 | 1255 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1256 | { |
8ae95199 DH |
1257 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1258 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1259 | return new_expr; | |
0f2d19dd JB |
1260 | } |
1261 | ||
8ea46249 | 1262 | |
a954ce1d DH |
1263 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1264 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1265 | ||
302c12b4 | 1266 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1267 | * reversed here. During the evaluation this allows for simple consing of the |
1268 | * results of the inits and steps: | |
302c12b4 | 1269 | |
0f2d19dd | 1270 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1271 | (<var2> <init2>) |
1272 | ... ) | |
1273 | (<test> <return>) | |
1274 | <body>) | |
302c12b4 | 1275 | |
0f2d19dd | 1276 | ;; becomes |
302c12b4 | 1277 | |
e681d187 | 1278 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1279 | (varn ... var2 var1) |
1280 | (<test> <return>) | |
1281 | (<body>) | |
1282 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1283 | */ |
0f2d19dd | 1284 | SCM |
a954ce1d | 1285 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1286 | { |
a954ce1d DH |
1287 | SCM variables = SCM_EOL; |
1288 | SCM init_forms = SCM_EOL; | |
1289 | SCM step_forms = SCM_EOL; | |
1290 | SCM binding_idx; | |
1291 | SCM cddr_expr; | |
1292 | SCM exit_clause; | |
1293 | SCM commands; | |
1294 | SCM tail; | |
1295 | ||
1296 | const SCM cdr_expr = SCM_CDR (expr); | |
1297 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1298 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1299 | ||
1300 | /* Collect variables, init and step forms. */ | |
1301 | binding_idx = SCM_CAR (cdr_expr); | |
1302 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1303 | s_bad_bindings, binding_idx, expr); | |
1304 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1305 | { |
a954ce1d DH |
1306 | const SCM binding = SCM_CAR (binding_idx); |
1307 | const long length = scm_ilength (binding); | |
1308 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1309 | s_bad_binding, binding, expr); | |
1310 | ||
302c12b4 | 1311 | { |
a954ce1d DH |
1312 | const SCM name = SCM_CAR (binding); |
1313 | const SCM init = SCM_CADR (binding); | |
1314 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
1315 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
4610b011 DH |
1316 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, variables)), |
1317 | s_duplicate_binding, name, expr); | |
1318 | ||
a954ce1d DH |
1319 | variables = scm_cons (name, variables); |
1320 | init_forms = scm_cons (init, init_forms); | |
1321 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1322 | } |
0f2d19dd | 1323 | } |
a954ce1d DH |
1324 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1325 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1326 | ||
1327 | /* Memoize the test form and the exit sequence. */ | |
1328 | cddr_expr = SCM_CDR (cdr_expr); | |
1329 | exit_clause = SCM_CAR (cddr_expr); | |
1330 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1331 | s_bad_exit_clause, exit_clause, expr); | |
1332 | ||
1333 | commands = SCM_CDR (cddr_expr); | |
1334 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1335 | tail = scm_cons2 (init_forms, variables, tail); | |
1336 | SCM_SETCAR (expr, SCM_IM_DO); | |
1337 | SCM_SETCDR (expr, tail); | |
1338 | return expr; | |
0f2d19dd JB |
1339 | } |
1340 | ||
b8229a3b | 1341 | |
3b88ed2a | 1342 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1343 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1344 | |
9fbee57e | 1345 | SCM |
4610b011 | 1346 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1347 | { |
4610b011 DH |
1348 | const SCM cdr_expr = SCM_CDR (expr); |
1349 | const long length = scm_ilength (cdr_expr); | |
1350 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1351 | SCM_SETCAR (expr, SCM_IM_IF); | |
1352 | return expr; | |
0f2d19dd JB |
1353 | } |
1354 | ||
302c12b4 | 1355 | |
3b88ed2a | 1356 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1357 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1358 | |
4610b011 DH |
1359 | /* A helper function for memoize_lambda to support checking for duplicate |
1360 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1361 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1362 | * forms that a formal argument can have: | |
1363 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1364 | static int |
4610b011 | 1365 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1366 | { |
9fbee57e DH |
1367 | for (; SCM_CONSP (list); list = SCM_CDR (list)) |
1368 | { | |
1369 | if (SCM_EQ_P (SCM_CAR (list), obj)) | |
4610b011 | 1370 | return 1; |
9fbee57e DH |
1371 | } |
1372 | return SCM_EQ_P (list, obj); | |
5cb22e96 DH |
1373 | } |
1374 | ||
28d52ebb | 1375 | SCM |
03a3e941 | 1376 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1377 | { |
9fbee57e | 1378 | SCM formals; |
03a3e941 | 1379 | SCM formals_idx; |
34adf7ea DH |
1380 | SCM cddr_expr; |
1381 | int documentation; | |
1382 | SCM body; | |
1383 | SCM new_body; | |
03a3e941 DH |
1384 | |
1385 | const SCM cdr_expr = SCM_CDR (expr); | |
1386 | const long length = scm_ilength (cdr_expr); | |
1387 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1388 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1389 | |
03a3e941 DH |
1390 | /* Before iterating the list of formal arguments, make sure the formals |
1391 | * actually are given as either a symbol or a non-cyclic list. */ | |
1392 | formals = SCM_CAR (cdr_expr); | |
1393 | if (SCM_CONSP (formals)) | |
1394 | { | |
1395 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1396 | * detected, report a 'Bad formals' error. */ | |
1397 | } | |
1398 | else | |
1399 | { | |
1400 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formals) || SCM_NULLP (formals), | |
1401 | s_bad_formals, formals, expr); | |
1402 | } | |
1cc91f1b | 1403 | |
03a3e941 DH |
1404 | /* Now iterate the list of formal arguments to check if all formals are |
1405 | * symbols, and that there are no duplicates. */ | |
1406 | formals_idx = formals; | |
1407 | while (SCM_CONSP (formals_idx)) | |
0f2d19dd | 1408 | { |
03a3e941 DH |
1409 | const SCM formal = SCM_CAR (formals_idx); |
1410 | const SCM next_idx = SCM_CDR (formals_idx); | |
1411 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formal), s_bad_formal, formal, expr); | |
1412 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), | |
1413 | s_duplicate_formal, formal, expr); | |
1414 | formals_idx = next_idx; | |
0f2d19dd | 1415 | } |
03a3e941 DH |
1416 | ASSERT_SYNTAX_2 (SCM_NULLP (formals_idx) || SCM_SYMBOLP (formals_idx), |
1417 | s_bad_formal, formals_idx, expr); | |
9fbee57e | 1418 | |
34adf7ea DH |
1419 | /* Memoize the body. Keep a potential documentation string. */ |
1420 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1421 | * some external database. Otherwise it will slow down execution, since | |
1422 | * the documentation string will have to be skipped with every execution | |
1423 | * of the closure. */ | |
1424 | cddr_expr = SCM_CDR (cdr_expr); | |
1425 | documentation = (length >= 3 && SCM_STRINGP (SCM_CAR (cddr_expr))); | |
1426 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; | |
430b8401 | 1427 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1428 | |
1429 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1430 | if (documentation) | |
1431 | SCM_SETCDR (cddr_expr, new_body); | |
1432 | else | |
1433 | SCM_SETCDR (cdr_expr, new_body); | |
1434 | return expr; | |
0f2d19dd | 1435 | } |
6dbd0af5 | 1436 | |
0f2d19dd | 1437 | |
d6754c23 | 1438 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1439 | static void |
d6754c23 | 1440 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1441 | { |
d6754c23 | 1442 | SCM binding_idx; |
302c12b4 | 1443 | |
d6754c23 DH |
1444 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1445 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1446 | |
d6754c23 DH |
1447 | binding_idx = bindings; |
1448 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1449 | { |
d6754c23 DH |
1450 | SCM name; /* const */ |
1451 | ||
1452 | const SCM binding = SCM_CAR (binding_idx); | |
1453 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1454 | s_bad_binding, binding, expr); | |
1455 | ||
1456 | name = SCM_CAR (binding); | |
1457 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
0f2d19dd | 1458 | } |
d6754c23 | 1459 | } |
26d5b9b4 | 1460 | |
d6754c23 DH |
1461 | |
1462 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1463 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1464 | * variables are returned in a list with their order reversed, and the init | |
1465 | * forms are returned in a list in the same order as they are given in the | |
1466 | * bindings. If a duplicate variable name is detected, an error is | |
1467 | * signalled. */ | |
1468 | static void | |
1469 | transform_bindings ( | |
1470 | const SCM bindings, const SCM expr, | |
1471 | SCM *const rvarptr, SCM *const initptr ) | |
1472 | { | |
1473 | SCM rvariables = SCM_EOL; | |
1474 | SCM rinits = SCM_EOL; | |
1475 | SCM binding_idx = bindings; | |
1476 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
1477 | { | |
1478 | const SCM binding = SCM_CAR (binding_idx); | |
1479 | const SCM cdr_binding = SCM_CDR (binding); | |
1480 | const SCM name = SCM_CAR (binding); | |
1481 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, rvariables)), | |
1482 | s_duplicate_binding, name, expr); | |
1483 | rvariables = scm_cons (name, rvariables); | |
1484 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1485 | } | |
1486 | *rvarptr = rvariables; | |
1487 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1488 | } |
1489 | ||
302c12b4 | 1490 | |
3b88ed2a | 1491 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1492 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1493 | |
d6754c23 DH |
1494 | /* This function is a helper function for memoize_let. It transforms |
1495 | * (let name ((var init) ...) body ...) into | |
1496 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1497 | * and memoizes the expression. It is assumed that the caller has checked | |
1498 | * that name is a symbol and that there are bindings and a body. */ | |
1499 | static SCM | |
1500 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1501 | { | |
1502 | SCM rvariables; | |
1503 | SCM variables; | |
1504 | SCM inits; | |
1505 | ||
1506 | const SCM cdr_expr = SCM_CDR (expr); | |
1507 | const SCM name = SCM_CAR (cdr_expr); | |
1508 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1509 | const SCM bindings = SCM_CAR (cddr_expr); | |
1510 | check_bindings (bindings, expr); | |
1511 | ||
1512 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1513 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1514 | ||
1515 | { | |
1516 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1517 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1518 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1519 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1520 | ||
1521 | const SCM rvar = scm_list_1 (name); | |
1522 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1523 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1524 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1525 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1526 | return scm_cons_source (expr, letrec_form, inits); | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1531 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1532 | SCM |
d6754c23 | 1533 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1534 | { |
d6754c23 DH |
1535 | SCM bindings; |
1536 | ||
1537 | const SCM cdr_expr = SCM_CDR (expr); | |
1538 | const long length = scm_ilength (cdr_expr); | |
1539 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1540 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1541 | |
d6754c23 DH |
1542 | bindings = SCM_CAR (cdr_expr); |
1543 | if (SCM_SYMBOLP (bindings)) | |
26d5b9b4 | 1544 | { |
d6754c23 DH |
1545 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1546 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1547 | } |
d6754c23 DH |
1548 | |
1549 | check_bindings (bindings, expr); | |
1550 | if (SCM_NULLP (bindings) || SCM_NULLP (SCM_CDR (bindings))) | |
26d5b9b4 | 1551 | { |
d6754c23 | 1552 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1553 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1554 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1555 | } |
302c12b4 DH |
1556 | else |
1557 | { | |
d6754c23 DH |
1558 | /* plain let */ |
1559 | SCM rvariables; | |
1560 | SCM inits; | |
1561 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1562 | |
302c12b4 | 1563 | { |
430b8401 | 1564 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1565 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1566 | SCM_SETCAR (expr, SCM_IM_LET); | |
1567 | SCM_SETCDR (expr, new_tail); | |
1568 | return expr; | |
302c12b4 DH |
1569 | } |
1570 | } | |
0f2d19dd JB |
1571 | } |
1572 | ||
1573 | ||
3b88ed2a | 1574 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1575 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1576 | |
d6754c23 DH |
1577 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1578 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1579 | SCM |
d6754c23 | 1580 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1581 | { |
d6754c23 | 1582 | SCM binding_idx; |
d6754c23 | 1583 | SCM new_body; |
0f2d19dd | 1584 | |
d6754c23 DH |
1585 | const SCM cdr_expr = SCM_CDR (expr); |
1586 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1587 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1588 | |
d6754c23 DH |
1589 | binding_idx = SCM_CAR (cdr_expr); |
1590 | check_bindings (binding_idx, expr); | |
1591 | ||
461bffb1 DH |
1592 | /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The |
1593 | * transformation is done in place. At the beginning of one iteration of | |
1594 | * the loop the variable binding_idx holds the form | |
1595 | * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ), | |
1596 | * where P1, P2 and P3 indicate the pairs, that are relevant for the | |
1597 | * transformation. P1 and P2 are modified in the loop, P3 remains | |
1598 | * untouched. After the execution of the loop, P1 will hold | |
1599 | * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) ) | |
1600 | * and binding_idx will hold P3. */ | |
1601 | while (!SCM_NULLP (binding_idx)) | |
9fbee57e | 1602 | { |
461bffb1 | 1603 | const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */ |
d6754c23 DH |
1604 | const SCM binding = SCM_CAR (binding_idx); |
1605 | const SCM name = SCM_CAR (binding); | |
461bffb1 DH |
1606 | const SCM cdr_binding = SCM_CDR (binding); |
1607 | ||
1608 | SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */ | |
1609 | SCM_SETCAR (binding_idx, name); /* update P1 */ | |
1610 | SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */ | |
1611 | ||
1612 | binding_idx = cdr_binding_idx; /* continue with P3 */ | |
9fbee57e DH |
1613 | } |
1614 | ||
430b8401 | 1615 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
461bffb1 DH |
1616 | SCM_SETCAR (expr, SCM_IM_LETSTAR); |
1617 | /* the bindings have been changed in place */ | |
1618 | SCM_SETCDR (cdr_expr, new_body); | |
1619 | return expr; | |
9fbee57e | 1620 | } |
b8229a3b | 1621 | |
0f2d19dd | 1622 | |
3b88ed2a | 1623 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); |
9fbee57e | 1624 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); |
1cc91f1b | 1625 | |
0f2d19dd | 1626 | SCM |
d6754c23 | 1627 | scm_m_letrec (SCM expr, SCM env) |
0f2d19dd | 1628 | { |
d6754c23 DH |
1629 | SCM bindings; |
1630 | ||
1631 | const SCM cdr_expr = SCM_CDR (expr); | |
1632 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1633 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1634 | ||
1635 | bindings = SCM_CAR (cdr_expr); | |
1636 | if (SCM_NULLP (bindings)) | |
9fbee57e | 1637 | { |
d6754c23 | 1638 | /* no bindings, let* is executed faster */ |
430b8401 | 1639 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1640 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); |
9fbee57e DH |
1641 | } |
1642 | else | |
1643 | { | |
d6754c23 DH |
1644 | SCM rvariables; |
1645 | SCM inits; | |
1646 | SCM new_body; | |
1647 | ||
1648 | check_bindings (bindings, expr); | |
1649 | transform_bindings (bindings, expr, &rvariables, &inits); | |
430b8401 | 1650 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1651 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); |
9fbee57e | 1652 | } |
0f2d19dd JB |
1653 | } |
1654 | ||
73b64342 | 1655 | |
3b88ed2a | 1656 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1657 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1658 | |
1659 | SCM | |
21628685 | 1660 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1661 | { |
21628685 DH |
1662 | const SCM cdr_expr = SCM_CDR (expr); |
1663 | const long length = scm_ilength (cdr_expr); | |
1664 | ||
1665 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1666 | ||
1667 | if (length == 0) | |
1668 | { | |
1669 | /* Special case: (or) is replaced by #f. */ | |
1670 | return SCM_BOOL_F; | |
1671 | } | |
9fbee57e | 1672 | else |
21628685 DH |
1673 | { |
1674 | SCM_SETCAR (expr, SCM_IM_OR); | |
1675 | return expr; | |
1676 | } | |
73b64342 MD |
1677 | } |
1678 | ||
73b64342 | 1679 | |
9fbee57e DH |
1680 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1681 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1682 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1683 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1684 | |
1685 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1686 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1687 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1688 | * nesting level and is known to be greater than zero. */ | |
1689 | static SCM | |
1690 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1691 | { |
9fbee57e | 1692 | if (SCM_CONSP (form)) |
c96d76b8 | 1693 | { |
21628685 | 1694 | const SCM tmp = SCM_CAR (form); |
9fbee57e DH |
1695 | if (SCM_EQ_P (tmp, scm_sym_quasiquote)) |
1696 | { | |
21628685 DH |
1697 | const SCM args = SCM_CDR (form); |
1698 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1699 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1700 | } | |
1701 | else if (SCM_EQ_P (tmp, scm_sym_unquote)) | |
1702 | { | |
21628685 DH |
1703 | const SCM args = SCM_CDR (form); |
1704 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1705 | if (depth - 1 == 0) |
1706 | return scm_eval_car (args, env); | |
1707 | else | |
1708 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1709 | } | |
1710 | else if (SCM_CONSP (tmp) | |
1711 | && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing)) | |
1712 | { | |
21628685 DH |
1713 | const SCM args = SCM_CDR (tmp); |
1714 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1715 | if (depth - 1 == 0) |
1716 | { | |
21628685 DH |
1717 | const SCM list = scm_eval_car (args, env); |
1718 | const SCM rest = SCM_CDR (form); | |
1719 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1720 | s_splicing, list, form); | |
9fbee57e DH |
1721 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1722 | } | |
1723 | else | |
1724 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1725 | iqq (SCM_CDR (form), env, depth)); | |
1726 | } | |
1727 | else | |
1728 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1729 | iqq (SCM_CDR (form), env, depth)); | |
1730 | } | |
1731 | else if (SCM_VECTORP (form)) | |
c96d76b8 | 1732 | { |
9fbee57e DH |
1733 | size_t i = SCM_VECTOR_LENGTH (form); |
1734 | SCM const *const data = SCM_VELTS (form); | |
1735 | SCM tmp = SCM_EOL; | |
1736 | while (i != 0) | |
1737 | tmp = scm_cons (data[--i], tmp); | |
1738 | scm_remember_upto_here_1 (form); | |
1739 | return scm_vector (iqq (tmp, env, depth)); | |
c96d76b8 | 1740 | } |
9fbee57e DH |
1741 | else |
1742 | return form; | |
1743 | } | |
1744 | ||
1745 | SCM | |
21628685 | 1746 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1747 | { |
21628685 DH |
1748 | const SCM cdr_expr = SCM_CDR (expr); |
1749 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1750 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1751 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1752 | } |
1753 | ||
1754 | ||
3b88ed2a | 1755 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1756 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1757 | ||
1758 | SCM | |
21628685 | 1759 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1760 | { |
21628685 DH |
1761 | SCM quotee; |
1762 | ||
1763 | const SCM cdr_expr = SCM_CDR (expr); | |
1764 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1765 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1766 | quotee = SCM_CAR (cdr_expr); | |
1767 | if (SCM_IMP (quotee) && !SCM_NULLP (quotee)) | |
1768 | return quotee; | |
1769 | else if (SCM_VECTORP (quotee)) | |
1770 | return quotee; | |
1771 | #if 0 | |
1772 | /* The following optimization would be possible if all variable references | |
1773 | * were resolved during memoization: */ | |
1774 | else if (SCM_SYMBOLP (quotee)) | |
1775 | return quotee; | |
1776 | #endif | |
1777 | SCM_SETCAR (expr, SCM_IM_QUOTE); | |
1778 | return expr; | |
9fbee57e DH |
1779 | } |
1780 | ||
1781 | ||
1782 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1783 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1784 | static const char s_set_x[] = "set!"; |
1785 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1786 | ||
1787 | SCM | |
82b3e2c6 | 1788 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1789 | { |
82b3e2c6 DH |
1790 | SCM variable; |
1791 | ||
1792 | const SCM cdr_expr = SCM_CDR (expr); | |
1793 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1794 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1795 | variable = SCM_CAR (cdr_expr); | |
7893dbbf MV |
1796 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable) || SCM_VARIABLEP (variable), |
1797 | s_bad_variable, variable, expr); | |
82b3e2c6 DH |
1798 | |
1799 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
1800 | return expr; | |
9fbee57e DH |
1801 | } |
1802 | ||
1803 | ||
1804 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1805 | ||
1806 | ||
3b88ed2a | 1807 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1808 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1809 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1810 | ||
1811 | SCM | |
82b3e2c6 | 1812 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1813 | { |
82b3e2c6 DH |
1814 | const SCM cdr_expr = SCM_CDR (expr); |
1815 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1816 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1817 | |
82b3e2c6 DH |
1818 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1819 | return expr; | |
1820 | } | |
2e171178 | 1821 | |
2e171178 | 1822 | |
3b88ed2a | 1823 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1824 | |
82b3e2c6 DH |
1825 | /* FIXME: The following explanation should go into the documentation: */ |
1826 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1827 | * the global variables named by `var's (symbols, not evaluated), creating | |
1828 | * them if they don't exist, executes body, and then restores the previous | |
1829 | * values of the `var's. Additionally, whenever control leaves body, the | |
1830 | * values of the `var's are saved and restored when control returns. It is an | |
1831 | * error when a symbol appears more than once among the `var's. All `init's | |
1832 | * are evaluated before any `var' is set. | |
1833 | * | |
1834 | * Think of this as `let' for dynamic scope. | |
1835 | */ | |
1836 | ||
1837 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
1838 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
1839 | * | |
1840 | * FIXME - also implement `@bind*'. | |
1841 | */ | |
73b64342 | 1842 | SCM |
82b3e2c6 | 1843 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 1844 | { |
82b3e2c6 DH |
1845 | SCM bindings; |
1846 | SCM rvariables; | |
1847 | SCM inits; | |
1848 | SCM variable_idx; | |
2e171178 | 1849 | |
82b3e2c6 | 1850 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 1851 | |
82b3e2c6 DH |
1852 | const SCM cdr_expr = SCM_CDR (expr); |
1853 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1854 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1855 | bindings = SCM_CAR (cdr_expr); | |
1856 | check_bindings (bindings, expr); | |
1857 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1858 | ||
1859 | for (variable_idx = rvariables; | |
1860 | !SCM_NULLP (variable_idx); | |
1861 | variable_idx = SCM_CDR (variable_idx)) | |
73b64342 | 1862 | { |
82b3e2c6 DH |
1863 | /* The first call to scm_sym2var will look beyond the current module, |
1864 | * while the second call wont. */ | |
1865 | const SCM variable = SCM_CAR (variable_idx); | |
1866 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
1867 | if (SCM_FALSEP (new_variable)) | |
1868 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); | |
1869 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 1870 | } |
82b3e2c6 DH |
1871 | |
1872 | SCM_SETCAR (expr, SCM_IM_BIND); | |
1873 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
1874 | return expr; | |
73b64342 | 1875 | } |
73b64342 | 1876 | |
b0c5d67b | 1877 | |
3b88ed2a | 1878 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
1879 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
1880 | ||
9fbee57e | 1881 | SCM |
da48db62 | 1882 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1883 | { |
da48db62 DH |
1884 | const SCM cdr_expr = SCM_CDR (expr); |
1885 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1886 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1887 | ||
1888 | SCM_SETCAR (expr, SCM_IM_CONT); | |
1889 | return expr; | |
b0c5d67b | 1890 | } |
b0c5d67b DH |
1891 | |
1892 | ||
3b88ed2a | 1893 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 1894 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
1895 | |
1896 | SCM | |
da48db62 | 1897 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1898 | { |
da48db62 DH |
1899 | const SCM cdr_expr = SCM_CDR (expr); |
1900 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1901 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1902 | ||
1903 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
1904 | return expr; | |
b0c5d67b | 1905 | } |
b0c5d67b DH |
1906 | |
1907 | ||
3b88ed2a | 1908 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 1909 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 1910 | |
9fbee57e DH |
1911 | /* Like promises, futures are implemented as closures with an empty |
1912 | * parameter list. Thus, (future <expression>) is transformed into | |
1913 | * (#@future '() <expression>), where the empty list represents the | |
1914 | * empty parameter list. This representation allows for easy creation | |
1915 | * of the closure during evaluation. */ | |
a513ead3 | 1916 | SCM |
8ae95199 | 1917 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 1918 | { |
8ae95199 DH |
1919 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1920 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
1921 | return new_expr; | |
a513ead3 MV |
1922 | } |
1923 | ||
9fbee57e | 1924 | |
3b88ed2a | 1925 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
1926 | SCM_SYMBOL (scm_sym_setter, "setter"); |
1927 | ||
1928 | SCM | |
7893dbbf | 1929 | scm_m_generalized_set_x (SCM expr, SCM env) |
9fbee57e | 1930 | { |
7893dbbf | 1931 | SCM target, exp_target; |
da48db62 DH |
1932 | |
1933 | const SCM cdr_expr = SCM_CDR (expr); | |
1934 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1935 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1936 | ||
1937 | target = SCM_CAR (cdr_expr); | |
1938 | if (!SCM_CONSP (target)) | |
1939 | { | |
1940 | /* R5RS usage */ | |
1941 | return scm_m_set_x (expr, env); | |
1942 | } | |
9fbee57e | 1943 | else |
da48db62 DH |
1944 | { |
1945 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
7893dbbf MV |
1946 | /* Macroexpanding the target might return things of the form |
1947 | (begin <atom>). In that case, <atom> must be a symbol or a | |
1948 | variable and we memoize to (set! <atom> ...). | |
1949 | */ | |
1950 | exp_target = scm_macroexp (target, env); | |
1951 | if (SCM_EQ_P (SCM_CAR (exp_target), SCM_IM_BEGIN) | |
1952 | && !SCM_NULLP (SCM_CDR (exp_target)) | |
1953 | && SCM_NULLP (SCM_CDDR (exp_target))) | |
1954 | { | |
1955 | exp_target= SCM_CADR (exp_target); | |
6d1a2e9f MV |
1956 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (exp_target) |
1957 | || SCM_VARIABLEP (exp_target), | |
1958 | s_bad_variable, exp_target, expr); | |
7893dbbf MV |
1959 | return scm_cons (SCM_IM_SET_X, scm_cons (exp_target, |
1960 | SCM_CDR (cdr_expr))); | |
1961 | } | |
1962 | else | |
1963 | { | |
1964 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
1965 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, | |
1966 | setter_proc_tail); | |
da48db62 | 1967 | |
7893dbbf MV |
1968 | const SCM cddr_expr = SCM_CDR (cdr_expr); |
1969 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), | |
1970 | cddr_expr)); | |
da48db62 | 1971 | |
7893dbbf MV |
1972 | SCM_SETCAR (expr, setter_proc); |
1973 | SCM_SETCDR (expr, setter_args); | |
1974 | return expr; | |
1975 | } | |
da48db62 | 1976 | } |
9fbee57e DH |
1977 | } |
1978 | ||
1979 | ||
a4aa2134 DH |
1980 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
1981 | * soon as the module system allows us to more freely create bindings in | |
1982 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1983 | * moved here. */ | |
9fbee57e | 1984 | SCM |
9a848baf | 1985 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1986 | { |
9a848baf DH |
1987 | SCM slot_nr; |
1988 | ||
1989 | const SCM cdr_expr = SCM_CDR (expr); | |
1990 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1991 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1992 | slot_nr = SCM_CADR (cdr_expr); | |
1993 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
9fbee57e | 1994 | |
9a848baf DH |
1995 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
1996 | return expr; | |
1997 | } | |
9fbee57e | 1998 | |
9fbee57e | 1999 | |
a4aa2134 DH |
2000 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
2001 | * soon as the module system allows us to more freely create bindings in | |
2002 | * arbitrary modules during the startup phase, the code from goops.c should be | |
2003 | * moved here. */ | |
9fbee57e | 2004 | SCM |
9a848baf | 2005 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2006 | { |
9a848baf DH |
2007 | SCM slot_nr; |
2008 | ||
2009 | const SCM cdr_expr = SCM_CDR (expr); | |
2010 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2011 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
2012 | slot_nr = SCM_CADR (cdr_expr); | |
2013 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
2014 | ||
2015 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
2016 | return expr; | |
9fbee57e | 2017 | } |
9fbee57e DH |
2018 | |
2019 | ||
2020 | #if SCM_ENABLE_ELISP | |
2021 | ||
70c1c108 DH |
2022 | static const char s_defun[] = "Symbol's function definition is void"; |
2023 | ||
3b88ed2a | 2024 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 2025 | |
70c1c108 DH |
2026 | /* nil-cond expressions have the form |
2027 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 2028 | SCM |
70c1c108 | 2029 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2030 | { |
70c1c108 DH |
2031 | const long length = scm_ilength (SCM_CDR (expr)); |
2032 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
2033 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
2034 | ||
2035 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
2036 | return expr; | |
9fbee57e DH |
2037 | } |
2038 | ||
2039 | ||
3b88ed2a | 2040 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 2041 | |
70c1c108 DH |
2042 | /* The @fop-macro handles procedure and macro applications for elisp. The |
2043 | * input expression must have the form | |
2044 | * (@fop <var> (transformer-macro <expr> ...)) | |
2045 | * where <var> must be a symbol. The expression is transformed into the | |
2046 | * memoized form of either | |
2047 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
2048 | * if the value of var (across all aliasing) is not a macro, or | |
2049 | * (<un-aliased var> <expr> ...) | |
2050 | * if var is a macro. */ | |
9fbee57e | 2051 | SCM |
70c1c108 | 2052 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2053 | { |
70c1c108 DH |
2054 | SCM location; |
2055 | SCM symbol; | |
2056 | ||
2057 | const SCM cdr_expr = SCM_CDR (expr); | |
2058 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2059 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
2060 | ||
2061 | symbol = SCM_CAR (cdr_expr); | |
2062 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (symbol), s_bad_variable, symbol, expr); | |
2063 | ||
2064 | location = scm_symbol_fref (symbol); | |
2065 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
2066 | ||
2067 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
2068 | * look up such definitions, the chain of symbol definitions has to be | |
2069 | * followed up to the terminal symbol. */ | |
2070 | while (SCM_SYMBOLP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2071 | { |
70c1c108 DH |
2072 | const SCM alias = SCM_VARIABLE_REF (location); |
2073 | location = scm_symbol_fref (alias); | |
2074 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 2075 | } |
70c1c108 DH |
2076 | |
2077 | /* Memoize the value location belonging to the terminal symbol. */ | |
2078 | SCM_SETCAR (cdr_expr, location); | |
2079 | ||
2080 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2081 | { |
70c1c108 DH |
2082 | /* Since the location does not contain a macro, the form is a procedure |
2083 | * application. Replace `@fop' by `@apply' and transform the expression | |
2084 | * including the `transformer-macro'. */ | |
2085 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2086 | return expr; | |
2087 | } | |
2088 | else | |
2089 | { | |
2090 | /* Since the location contains a macro, the arguments should not be | |
2091 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2092 | * expression starts with the memoized variable, that is at the cdr of | |
2093 | * the input expression. */ | |
2094 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2095 | return cdr_expr; | |
9fbee57e | 2096 | } |
9fbee57e DH |
2097 | } |
2098 | ||
2099 | #endif /* SCM_ENABLE_ELISP */ | |
2100 | ||
2101 | ||
f58c472a DH |
2102 | /* Start of the memoizers for deprecated macros. */ |
2103 | ||
2104 | ||
2105 | #if (SCM_ENABLE_DEPRECATED == 1) | |
2106 | ||
2107 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2108 | ||
2109 | SCM | |
70c1c108 | 2110 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2111 | { |
70c1c108 DH |
2112 | SCM variable; |
2113 | SCM location; | |
2114 | ||
2115 | const SCM cdr_expr = SCM_CDR (expr); | |
2116 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2117 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2118 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2119 | ||
2120 | variable = SCM_CAR (cdr_expr); | |
2121 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
2122 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); | |
2123 | ASSERT_SYNTAX_2 (!SCM_FALSEP (location) | |
2124 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), | |
2125 | "variable already unbound ", variable, expr); | |
2126 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2127 | return SCM_UNSPECIFIED; |
f58c472a DH |
2128 | } |
2129 | ||
2130 | #endif | |
2131 | ||
2132 | ||
6f81708a DH |
2133 | #if (SCM_ENABLE_DEPRECATED == 1) |
2134 | ||
26d5b9b4 MD |
2135 | SCM |
2136 | scm_macroexp (SCM x, SCM env) | |
2137 | { | |
86d31dfe | 2138 | SCM res, proc, orig_sym; |
26d5b9b4 MD |
2139 | |
2140 | /* Don't bother to produce error messages here. We get them when we | |
2141 | eventually execute the code for real. */ | |
2142 | ||
2143 | macro_tail: | |
86d31dfe MV |
2144 | orig_sym = SCM_CAR (x); |
2145 | if (!SCM_SYMBOLP (orig_sym)) | |
26d5b9b4 MD |
2146 | return x; |
2147 | ||
26d5b9b4 MD |
2148 | { |
2149 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
2150 | if (proc_ptr == NULL) | |
2151 | { | |
2152 | /* We have lost the race. */ | |
2153 | goto macro_tail; | |
2154 | } | |
2155 | proc = *proc_ptr; | |
2156 | } | |
26d5b9b4 MD |
2157 | |
2158 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
2159 | special forms and should not be evaluated here. */ | |
2160 | ||
3b88ed2a DH |
2161 | if (!SCM_MACROP (proc) |
2162 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
26d5b9b4 MD |
2163 | return x; |
2164 | ||
86d31dfe | 2165 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ |
fdc28395 | 2166 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); |
26d5b9b4 MD |
2167 | |
2168 | if (scm_ilength (res) <= 0) | |
8ea46249 | 2169 | res = scm_list_2 (SCM_IM_BEGIN, res); |
26d5b9b4 | 2170 | |
26d5b9b4 MD |
2171 | SCM_DEFER_INTS; |
2172 | SCM_SETCAR (x, SCM_CAR (res)); | |
2173 | SCM_SETCDR (x, SCM_CDR (res)); | |
2174 | SCM_ALLOW_INTS; | |
2175 | ||
2176 | goto macro_tail; | |
2177 | } | |
73b64342 | 2178 | |
6f81708a DH |
2179 | #endif |
2180 | ||
2181 | /*****************************************************************************/ | |
2182 | /*****************************************************************************/ | |
2183 | /* The definitions for unmemoization start here. */ | |
2184 | /*****************************************************************************/ | |
2185 | /*****************************************************************************/ | |
2186 | ||
a44a9715 DH |
2187 | #define SCM_BIT7(x) (127 & SCM_UNPACK (x)) |
2188 | ||
6f81708a | 2189 | SCM_SYMBOL (sym_three_question_marks, "???"); |
a44a9715 | 2190 | |
60a49842 | 2191 | |
6dbd0af5 MD |
2192 | /* scm_unmemocopy takes a memoized expression together with its |
2193 | * environment and rewrites it to its original form. Thus, it is the | |
2194 | * inversion of the rewrite rules above. The procedure is not | |
2195 | * optimized for speed. It's used in scm_iprin1 when printing the | |
220ff1eb MD |
2196 | * code of a closure, in scm_procedure_source, in display_frame when |
2197 | * generating the source for a stackframe in a backtrace, and in | |
2198 | * display_expression. | |
86d31dfe | 2199 | * |
c96d76b8 | 2200 | * Unmemoizing is not a reliable process. You cannot in general |
86d31dfe MV |
2201 | * expect to get the original source back. |
2202 | * | |
2203 | * However, GOOPS currently relies on this for method compilation. | |
2204 | * This ought to change. | |
26d5b9b4 MD |
2205 | */ |
2206 | ||
8ea46249 | 2207 | static SCM |
60a49842 | 2208 | build_binding_list (SCM rnames, SCM rinits) |
8ea46249 DH |
2209 | { |
2210 | SCM bindings = SCM_EOL; | |
60a49842 | 2211 | while (!SCM_NULLP (rnames)) |
8ea46249 | 2212 | { |
60a49842 | 2213 | SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); |
8ea46249 | 2214 | bindings = scm_cons (binding, bindings); |
60a49842 DH |
2215 | rnames = SCM_CDR (rnames); |
2216 | rinits = SCM_CDR (rinits); | |
8ea46249 DH |
2217 | } |
2218 | return bindings; | |
2219 | } | |
2220 | ||
60a49842 | 2221 | |
6f81708a DH |
2222 | static SCM |
2223 | unmemocar (SCM form, SCM env) | |
60a49842 DH |
2224 | { |
2225 | if (!SCM_CONSP (form)) | |
2226 | return form; | |
2227 | else | |
2228 | { | |
2229 | SCM c = SCM_CAR (form); | |
2230 | if (SCM_VARIABLEP (c)) | |
2231 | { | |
2232 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
2233 | if (SCM_FALSEP (sym)) | |
2234 | sym = sym_three_question_marks; | |
2235 | SCM_SETCAR (form, sym); | |
2236 | } | |
2237 | else if (SCM_ILOCP (c)) | |
2238 | { | |
2239 | unsigned long int ir; | |
2240 | ||
2241 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2242 | env = SCM_CDR (env); | |
2243 | env = SCM_CAAR (env); | |
2244 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2245 | env = SCM_CDR (env); | |
f62b9dff | 2246 | |
60a49842 DH |
2247 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); |
2248 | } | |
2249 | return form; | |
2250 | } | |
2251 | } | |
2252 | ||
6f81708a DH |
2253 | |
2254 | #if (SCM_ENABLE_DEPRECATED == 1) | |
2255 | ||
2256 | SCM | |
2257 | scm_unmemocar (SCM form, SCM env) | |
2258 | { | |
2259 | return unmemocar (form, env); | |
2260 | } | |
2261 | ||
2262 | #endif | |
2263 | ||
2264 | ||
6bff1368 DH |
2265 | SCM |
2266 | scm_unmemocopy (SCM x, SCM env) | |
6dbd0af5 MD |
2267 | { |
2268 | SCM ls, z; | |
6dbd0af5 | 2269 | SCM p; |
21628685 DH |
2270 | |
2271 | if (SCM_VECTORP (x)) | |
2272 | { | |
2273 | return scm_list_2 (scm_sym_quote, x); | |
2274 | } | |
2275 | else if (!SCM_CONSP (x)) | |
6dbd0af5 | 2276 | return x; |
21628685 | 2277 | |
6dbd0af5 | 2278 | p = scm_whash_lookup (scm_source_whash, x); |
8ea46249 | 2279 | switch (SCM_ITAG7 (SCM_CAR (x))) |
6dbd0af5 | 2280 | { |
1b43d24c | 2281 | case SCM_BIT7 (SCM_IM_AND): |
2f0d1375 | 2282 | ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED); |
6dbd0af5 | 2283 | break; |
1b43d24c | 2284 | case SCM_BIT7 (SCM_IM_BEGIN): |
2f0d1375 | 2285 | ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED); |
6dbd0af5 | 2286 | break; |
1b43d24c | 2287 | case SCM_BIT7 (SCM_IM_CASE): |
2f0d1375 | 2288 | ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED); |
6dbd0af5 | 2289 | break; |
1b43d24c | 2290 | case SCM_BIT7 (SCM_IM_COND): |
2f0d1375 | 2291 | ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED); |
6dbd0af5 | 2292 | break; |
1b43d24c | 2293 | case SCM_BIT7 (SCM_IM_DO): |
6dbd0af5 | 2294 | { |
e681d187 DH |
2295 | /* format: (#@do (i1 ... ik) (nk nk-1 ...) (test) (body) s1 ... sk), |
2296 | * where ix is an initializer for a local variable, nx is the name of | |
8ea46249 DH |
2297 | * the local variable, test is the test clause of the do loop, body is |
2298 | * the body of the do loop and sx are the step clauses for the local | |
2299 | * variables. */ | |
2300 | SCM names, inits, test, memoized_body, steps, bindings; | |
2301 | ||
6dbd0af5 | 2302 | x = SCM_CDR (x); |
6bff1368 | 2303 | inits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); |
e681d187 DH |
2304 | x = SCM_CDR (x); |
2305 | names = SCM_CAR (x); | |
821f18a4 | 2306 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); |
6dbd0af5 | 2307 | x = SCM_CDR (x); |
6bff1368 | 2308 | test = scm_unmemocopy (SCM_CAR (x), env); |
8ea46249 DH |
2309 | x = SCM_CDR (x); |
2310 | memoized_body = SCM_CAR (x); | |
2311 | x = SCM_CDR (x); | |
6bff1368 | 2312 | steps = scm_reverse (scm_unmemocopy (x, env)); |
8ea46249 | 2313 | |
26d5b9b4 | 2314 | /* build transformed binding list */ |
8ea46249 DH |
2315 | bindings = SCM_EOL; |
2316 | while (!SCM_NULLP (names)) | |
6dbd0af5 | 2317 | { |
8ea46249 DH |
2318 | SCM name = SCM_CAR (names); |
2319 | SCM init = SCM_CAR (inits); | |
2320 | SCM step = SCM_CAR (steps); | |
2321 | step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step); | |
2322 | ||
2323 | bindings = scm_cons (scm_cons2 (name, init, step), bindings); | |
2324 | ||
2325 | names = SCM_CDR (names); | |
2326 | inits = SCM_CDR (inits); | |
2327 | steps = SCM_CDR (steps); | |
6dbd0af5 | 2328 | } |
8ea46249 DH |
2329 | z = scm_cons (test, SCM_UNSPECIFIED); |
2330 | ls = scm_cons2 (scm_sym_do, bindings, z); | |
2331 | ||
2332 | x = scm_cons (SCM_BOOL_F, memoized_body); | |
2333 | break; | |
2334 | } | |
1b43d24c | 2335 | case SCM_BIT7 (SCM_IM_IF): |
8ea46249 DH |
2336 | ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED); |
2337 | break; | |
1b43d24c | 2338 | case SCM_BIT7 (SCM_IM_LET): |
8ea46249 DH |
2339 | { |
2340 | /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...), | |
2341 | * where nx is the name of a local variable, ix is an initializer for | |
2342 | * the local variable and by are the body clauses. */ | |
60a49842 | 2343 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2344 | |
2345 | x = SCM_CDR (x); | |
60a49842 | 2346 | rnames = SCM_CAR (x); |
8ea46249 | 2347 | x = SCM_CDR (x); |
6bff1368 | 2348 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); |
60a49842 | 2349 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); |
8ea46249 | 2350 | |
60a49842 | 2351 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2352 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2353 | ls = scm_cons (scm_sym_let, z); | |
2354 | break; | |
2355 | } | |
1b43d24c | 2356 | case SCM_BIT7 (SCM_IM_LETREC): |
8ea46249 | 2357 | { |
60a49842 DH |
2358 | /* format: (#@letrec (vn ... v2 v1) (i1 i2 ... in) b1 ...), |
2359 | * where vx is the name of a local variable, ix is an initializer for | |
8ea46249 | 2360 | * the local variable and by are the body clauses. */ |
60a49842 | 2361 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2362 | |
2363 | x = SCM_CDR (x); | |
60a49842 DH |
2364 | rnames = SCM_CAR (x); |
2365 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
8ea46249 | 2366 | x = SCM_CDR (x); |
6bff1368 | 2367 | rinits = scm_reverse (scm_unmemocopy (SCM_CAR (x), env)); |
8ea46249 | 2368 | |
60a49842 | 2369 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2370 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2371 | ls = scm_cons (scm_sym_letrec, z); | |
6dbd0af5 MD |
2372 | break; |
2373 | } | |
1b43d24c | 2374 | case SCM_BIT7 (SCM_IM_LETSTAR): |
6dbd0af5 MD |
2375 | { |
2376 | SCM b, y; | |
2377 | x = SCM_CDR (x); | |
2378 | b = SCM_CAR (x); | |
2379 | y = SCM_EOL; | |
2380 | if SCM_IMP (b) | |
2381 | { | |
821f18a4 | 2382 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
6dbd0af5 MD |
2383 | goto letstar; |
2384 | } | |
2385 | y = z = scm_acons (SCM_CAR (b), | |
2386 | unmemocar ( | |
6bff1368 | 2387 | scm_cons (scm_unmemocopy (SCM_CADR (b), env), SCM_EOL), env), |
6dbd0af5 | 2388 | SCM_UNSPECIFIED); |
821f18a4 | 2389 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2390 | b = SCM_CDDR (b); |
6dbd0af5 MD |
2391 | if (SCM_IMP (b)) |
2392 | { | |
2393 | SCM_SETCDR (y, SCM_EOL); | |
05b15362 DH |
2394 | z = scm_cons (y, SCM_UNSPECIFIED); |
2395 | ls = scm_cons (scm_sym_let, z); | |
6dbd0af5 MD |
2396 | break; |
2397 | } | |
2398 | do | |
2399 | { | |
a23afe53 MD |
2400 | SCM_SETCDR (z, scm_acons (SCM_CAR (b), |
2401 | unmemocar ( | |
6bff1368 | 2402 | scm_list_1 (scm_unmemocopy (SCM_CADR (b), env)), env), |
a23afe53 MD |
2403 | SCM_UNSPECIFIED)); |
2404 | z = SCM_CDR (z); | |
821f18a4 | 2405 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2406 | b = SCM_CDDR (b); |
6dbd0af5 | 2407 | } |
ff467021 | 2408 | while (SCM_NIMP (b)); |
a23afe53 | 2409 | SCM_SETCDR (z, SCM_EOL); |
6dbd0af5 | 2410 | letstar: |
05b15362 DH |
2411 | z = scm_cons (y, SCM_UNSPECIFIED); |
2412 | ls = scm_cons (scm_sym_letstar, z); | |
6dbd0af5 MD |
2413 | break; |
2414 | } | |
1b43d24c | 2415 | case SCM_BIT7 (SCM_IM_OR): |
2f0d1375 | 2416 | ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED); |
6dbd0af5 | 2417 | break; |
1b43d24c | 2418 | case SCM_BIT7 (SCM_IM_LAMBDA): |
6dbd0af5 | 2419 | x = SCM_CDR (x); |
8ea46249 DH |
2420 | z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED); |
2421 | ls = scm_cons (scm_sym_lambda, z); | |
821f18a4 | 2422 | env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env); |
6dbd0af5 | 2423 | break; |
1b43d24c | 2424 | case SCM_BIT7 (SCM_IM_QUOTE): |
2f0d1375 | 2425 | ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED); |
6dbd0af5 | 2426 | break; |
1b43d24c | 2427 | case SCM_BIT7 (SCM_IM_SET_X): |
89efbff4 | 2428 | ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED); |
6dbd0af5 | 2429 | break; |
1b43d24c | 2430 | case SCM_BIT7 (SCM_MAKISYM (0)): |
6dbd0af5 | 2431 | z = SCM_CAR (x); |
ff467021 | 2432 | switch (SCM_ISYMNUM (z)) |
6dbd0af5 MD |
2433 | { |
2434 | case (SCM_ISYMNUM (SCM_IM_APPLY)): | |
2f0d1375 | 2435 | ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED); |
6dbd0af5 MD |
2436 | goto loop; |
2437 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
2f0d1375 | 2438 | ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED); |
6dbd0af5 | 2439 | goto loop; |
a570e93a MD |
2440 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
2441 | ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED); | |
2442 | x = SCM_CDR (x); | |
2443 | goto loop; | |
28d52ebb | 2444 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
ebf9b47c | 2445 | ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED); |
28d52ebb MD |
2446 | x = SCM_CDR (x); |
2447 | goto loop; | |
a513ead3 MV |
2448 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
2449 | ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED); | |
2450 | goto loop; | |
2a6f7afe DH |
2451 | case (SCM_ISYMNUM (SCM_IM_ELSE)): |
2452 | ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED); | |
2453 | goto loop; | |
6dbd0af5 | 2454 | default: |
fa888178 | 2455 | /* appease the Sun compiler god: */ ; |
6dbd0af5 | 2456 | } |
6dbd0af5 | 2457 | default: |
6bff1368 | 2458 | ls = z = unmemocar (scm_cons (scm_unmemocopy (SCM_CAR (x), env), |
6dbd0af5 MD |
2459 | SCM_UNSPECIFIED), |
2460 | env); | |
2461 | } | |
2462 | loop: | |
8c494e99 DH |
2463 | x = SCM_CDR (x); |
2464 | while (SCM_CONSP (x)) | |
a23afe53 | 2465 | { |
8c494e99 DH |
2466 | SCM form = SCM_CAR (x); |
2467 | if (!SCM_ISYMP (form)) | |
2468 | { | |
6bff1368 | 2469 | SCM copy = scm_cons (scm_unmemocopy (form, env), SCM_UNSPECIFIED); |
8c494e99 DH |
2470 | SCM_SETCDR (z, unmemocar (copy, env)); |
2471 | z = SCM_CDR (z); | |
2472 | } | |
609a8b86 DH |
2473 | else if (SCM_EQ_P (form, SCM_IM_ARROW)) |
2474 | { | |
2475 | SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED)); | |
2476 | z = SCM_CDR (z); | |
2477 | } | |
8c494e99 | 2478 | x = SCM_CDR (x); |
a23afe53 MD |
2479 | } |
2480 | SCM_SETCDR (z, x); | |
01f11e02 | 2481 | if (!SCM_FALSEP (p)) |
6dbd0af5 | 2482 | scm_whash_insert (scm_source_whash, ls, p); |
6dbd0af5 MD |
2483 | return ls; |
2484 | } | |
2485 | ||
1cc91f1b | 2486 | |
6f81708a DH |
2487 | /*****************************************************************************/ |
2488 | /*****************************************************************************/ | |
2489 | /* The definitions for execution start here. */ | |
2490 | /*****************************************************************************/ | |
2491 | /*****************************************************************************/ | |
2492 | ||
2493 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2494 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2495 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2496 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
2497 | ||
2498 | /* A function object to implement "apply" for non-closure functions. */ | |
2499 | static SCM f_apply; | |
2500 | /* An endless list consisting of #<undefined> objects: */ | |
2501 | static SCM undefineds; | |
2502 | ||
2503 | ||
2504 | int | |
6e8d25a6 | 2505 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2506 | { |
6a0f6ff3 | 2507 | while (!SCM_NULLP (formals)) |
0f2d19dd | 2508 | { |
01f11e02 | 2509 | if (!SCM_CONSP (formals)) |
ff467021 | 2510 | return 0; |
6a0f6ff3 | 2511 | if (SCM_NULLP (args)) |
ff467021 | 2512 | return 1; |
0f2d19dd JB |
2513 | formals = SCM_CDR (formals); |
2514 | args = SCM_CDR (args); | |
2515 | } | |
01f11e02 | 2516 | return !SCM_NULLP (args) ? 1 : 0; |
0f2d19dd | 2517 | } |
a392ee15 | 2518 | |
0f2d19dd | 2519 | \f |
6dbd0af5 | 2520 | SCM |
6e8d25a6 | 2521 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2522 | { |
680ed4a8 | 2523 | SCM results = SCM_EOL, *lloc = &results, res; |
904a077d | 2524 | while (SCM_CONSP (l)) |
6dbd0af5 | 2525 | { |
680ed4a8 | 2526 | res = EVALCAR (l, env); |
904a077d | 2527 | |
8ea46249 | 2528 | *lloc = scm_list_1 (res); |
a23afe53 | 2529 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2530 | l = SCM_CDR (l); |
2531 | } | |
22a52da1 | 2532 | if (!SCM_NULLP (l)) |
904a077d | 2533 | scm_wrong_num_args (proc); |
680ed4a8 | 2534 | return results; |
6dbd0af5 | 2535 | } |
c4ac4d88 | 2536 | |
d0b07b5d | 2537 | |
9de33deb MD |
2538 | SCM |
2539 | scm_eval_body (SCM code, SCM env) | |
2540 | { | |
2541 | SCM next; | |
2542 | again: | |
01f11e02 DH |
2543 | next = SCM_CDR (code); |
2544 | while (!SCM_NULLP (next)) | |
9de33deb MD |
2545 | { |
2546 | if (SCM_IMP (SCM_CAR (code))) | |
2547 | { | |
2548 | if (SCM_ISYMP (SCM_CAR (code))) | |
2549 | { | |
28d52ebb | 2550 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2551 | /* check for race condition */ |
2552 | if (SCM_ISYMP (SCM_CAR (code))) | |
9d4bf6d3 | 2553 | m_expand_body (code, env); |
28d52ebb | 2554 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2555 | goto again; |
2556 | } | |
2557 | } | |
2558 | else | |
2559 | SCM_XEVAL (SCM_CAR (code), env); | |
2560 | code = next; | |
01f11e02 | 2561 | next = SCM_CDR (code); |
9de33deb MD |
2562 | } |
2563 | return SCM_XEVALCAR (code, env); | |
2564 | } | |
2565 | ||
0f2d19dd JB |
2566 | #endif /* !DEVAL */ |
2567 | ||
6dbd0af5 MD |
2568 | |
2569 | /* SECTION: This code is specific for the debugging support. One | |
2570 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2571 | * defined. | |
2572 | */ | |
2573 | ||
2574 | #ifndef DEVAL | |
2575 | ||
2576 | #define SCM_APPLY scm_apply | |
2577 | #define PREP_APPLY(proc, args) | |
2578 | #define ENTER_APPLY | |
ddea3325 | 2579 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2580 | #ifdef STACK_CHECKING |
2581 | #ifndef NO_CEVAL_STACK_CHECKING | |
2582 | #define EVAL_STACK_CHECKING | |
2583 | #endif | |
6dbd0af5 MD |
2584 | #endif |
2585 | ||
2586 | #else /* !DEVAL */ | |
2587 | ||
0f2d19dd JB |
2588 | #undef SCM_CEVAL |
2589 | #define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */ | |
2590 | #undef SCM_APPLY | |
2591 | #define SCM_APPLY scm_dapply | |
6dbd0af5 MD |
2592 | #undef PREP_APPLY |
2593 | #define PREP_APPLY(p, l) \ | |
2594 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
2595 | #undef ENTER_APPLY | |
2596 | #define ENTER_APPLY \ | |
d3a6bc94 | 2597 | do { \ |
b7ff98dd | 2598 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2599 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2600 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2601 | {\ |
156dcb09 | 2602 | SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2603 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2604 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2605 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2606 | {\ |
c0ab1b8d | 2607 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 2608 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 2609 | }\ |
6dbd0af5 MD |
2610 | else\ |
2611 | {\ | |
5f144b10 GH |
2612 | int first;\ |
2613 | tmp = scm_make_continuation (&first);\ | |
2614 | if (first)\ | |
d95c0b76 | 2615 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 2616 | }\ |
d95c0b76 | 2617 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 2618 | }\ |
d3a6bc94 | 2619 | } while (0) |
0f2d19dd | 2620 | #undef RETURN |
ddea3325 | 2621 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
b7ff98dd MD |
2622 | #ifdef STACK_CHECKING |
2623 | #ifndef EVAL_STACK_CHECKING | |
2624 | #define EVAL_STACK_CHECKING | |
2625 | #endif | |
6dbd0af5 MD |
2626 | #endif |
2627 | ||
2628 | /* scm_ceval_ptr points to the currently selected evaluator. | |
2629 | * *fixme*: Although efficiency is important here, this state variable | |
2630 | * should probably not be a global. It should be related to the | |
2631 | * current repl. | |
2632 | */ | |
2633 | ||
1cc91f1b | 2634 | |
1bbd0b84 | 2635 | SCM (*scm_ceval_ptr) (SCM x, SCM env); |
0f2d19dd | 2636 | |
1646d37b | 2637 | /* scm_last_debug_frame contains a pointer to the last debugging |
6dbd0af5 MD |
2638 | * information stack frame. It is accessed very often from the |
2639 | * debugging evaluator, so it should probably not be indirectly | |
2640 | * addressed. Better to save and restore it from the current root at | |
2641 | * any stack swaps. | |
2642 | */ | |
2643 | ||
6dbd0af5 MD |
2644 | /* scm_debug_eframe_size is the number of slots available for pseudo |
2645 | * stack frames at each real stack frame. | |
2646 | */ | |
2647 | ||
c014a02e | 2648 | long scm_debug_eframe_size; |
6dbd0af5 | 2649 | |
b7ff98dd | 2650 | int scm_debug_mode, scm_check_entry_p, scm_check_apply_p, scm_check_exit_p; |
6dbd0af5 | 2651 | |
c014a02e | 2652 | long scm_eval_stack; |
a74145b8 | 2653 | |
92c2555f | 2654 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 2655 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
2656 | }; |
2657 | ||
92c2555f | 2658 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
2659 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
2660 | "*Flyweight representation of the stack at traps." }, | |
2661 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
2662 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
2663 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
2664 | "Record procedure names at definition." }, | |
2665 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
2666 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 2667 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
2668 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
2669 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 2670 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
2671 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
2672 | "Maximal number of stored backtrace frames." }, | |
2673 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
2674 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
2675 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 2676 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 2677 | { 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 |
2678 | }; |
2679 | ||
92c2555f | 2680 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 2681 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
2682 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
2683 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
2684 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
2685 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
2686 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
2687 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
2688 | }; |
2689 | ||
a1ec6916 | 2690 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 2691 | (SCM setting), |
b3f26b14 MG |
2692 | "Option interface for the evaluation options. Instead of using\n" |
2693 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 2694 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 2695 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
2696 | { |
2697 | SCM ans; | |
2698 | SCM_DEFER_INTS; | |
2699 | ans = scm_options (setting, | |
2700 | scm_eval_opts, | |
2701 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 2702 | FUNC_NAME); |
a74145b8 | 2703 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
2704 | SCM_ALLOW_INTS; |
2705 | return ans; | |
2706 | } | |
1bbd0b84 | 2707 | #undef FUNC_NAME |
33b97402 | 2708 | |
d0b07b5d | 2709 | |
a1ec6916 | 2710 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 2711 | (SCM setting), |
b3f26b14 | 2712 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 2713 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
2714 | { |
2715 | SCM ans; | |
2716 | SCM_DEFER_INTS; | |
2717 | ans = scm_options (setting, | |
2718 | scm_evaluator_trap_table, | |
2719 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 2720 | FUNC_NAME); |
33b97402 | 2721 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 2722 | SCM_ALLOW_INTS; |
33b97402 MD |
2723 | return ans; |
2724 | } | |
1bbd0b84 | 2725 | #undef FUNC_NAME |
33b97402 | 2726 | |
d0b07b5d | 2727 | |
24933780 | 2728 | static SCM |
a392ee15 | 2729 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 2730 | { |
680ed4a8 | 2731 | SCM *results = lloc, res; |
904a077d | 2732 | while (SCM_CONSP (l)) |
0f2d19dd | 2733 | { |
680ed4a8 | 2734 | res = EVALCAR (l, env); |
904a077d | 2735 | |
8ea46249 | 2736 | *lloc = scm_list_1 (res); |
a23afe53 | 2737 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
2738 | l = SCM_CDR (l); |
2739 | } | |
22a52da1 | 2740 | if (!SCM_NULLP (l)) |
904a077d | 2741 | scm_wrong_num_args (proc); |
680ed4a8 | 2742 | return *results; |
0f2d19dd JB |
2743 | } |
2744 | ||
6dbd0af5 MD |
2745 | #endif /* !DEVAL */ |
2746 | ||
2747 | ||
a392ee15 | 2748 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
2749 | */ |
2750 | ||
a392ee15 | 2751 | |
d9d39d76 | 2752 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 2753 | * current module. */ |
d9d39d76 MV |
2754 | #define UPDATE_TOPLEVEL_ENV(env) \ |
2755 | do { \ | |
2756 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 2757 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
2758 | env = scm_top_level_env (p); \ |
2759 | } while (0) | |
2760 | ||
6dbd0af5 | 2761 | |
6f81708a DH |
2762 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
2763 | ASSERT_SYNTAX (!SCM_EQ_P ((x), SCM_EOL), s_empty_combination, x) | |
2764 | ||
2765 | ||
a392ee15 DH |
2766 | /* This is the evaluator. Like any real monster, it has three heads: |
2767 | * | |
2768 | * scm_ceval is the non-debugging evaluator, scm_deval is the debugging | |
2769 | * version. Both are implemented using a common code base, using the | |
2770 | * following mechanism: SCM_CEVAL is a macro, which is either defined to | |
2771 | * scm_ceval or scm_deval. Thus, there is no function SCM_CEVAL, but the code | |
2772 | * for SCM_CEVAL actually compiles to either scm_ceval or scm_deval. When | |
2773 | * SCM_CEVAL is defined to scm_ceval, it is known that the macro DEVAL is not | |
2774 | * defined. When SCM_CEVAL is defined to scm_deval, then the macro DEVAL is | |
2775 | * known to be defined. Thus, in SCM_CEVAL parts for the debugging evaluator | |
2776 | * are enclosed within #ifdef DEVAL ... #endif. | |
2777 | * | |
2778 | * All three (scm_ceval, scm_deval and their common implementation SCM_CEVAL) | |
2779 | * take two input parameters, x and env: x is a single expression to be | |
2780 | * evalutated. env is the environment in which bindings are searched. | |
2781 | * | |
2782 | * x is known to be a cell (i. e. a pair or any other non-immediate). Since x | |
2783 | * is a single expression, it is necessarily in a tail position. If x is just | |
2784 | * a call to another function like in the expression (foo exp1 exp2 ...), the | |
2785 | * realization of that call therefore _must_not_ increase stack usage (the | |
2786 | * evaluation of exp1, exp2 etc., however, may do so). This is realized by | |
2787 | * making extensive use of 'goto' statements within the evaluator: The gotos | |
2788 | * replace recursive calls to SCM_CEVAL, thus re-using the same stack frame | |
2789 | * that SCM_CEVAL was already using. If, however, x represents some form that | |
2790 | * requires to evaluate a sequence of expressions like (begin exp1 exp2 ...), | |
2791 | * then recursive calls to SCM_CEVAL are performed for all but the last | |
2792 | * expression of that sequence. */ | |
6dbd0af5 | 2793 | |
0f2d19dd | 2794 | #if 0 |
0f2d19dd | 2795 | SCM |
1bbd0b84 | 2796 | scm_ceval (SCM x, SCM env) |
0f2d19dd JB |
2797 | {} |
2798 | #endif | |
1cc91f1b | 2799 | |
a392ee15 | 2800 | #if 0 |
0f2d19dd | 2801 | SCM |
1bbd0b84 | 2802 | scm_deval (SCM x, SCM env) |
0f2d19dd JB |
2803 | {} |
2804 | #endif | |
2805 | ||
6dbd0af5 | 2806 | SCM |
1bbd0b84 | 2807 | SCM_CEVAL (SCM x, SCM env) |
0f2d19dd | 2808 | { |
42030fb2 | 2809 | SCM proc, arg1; |
6dbd0af5 | 2810 | #ifdef DEVAL |
92c2555f MV |
2811 | scm_t_debug_frame debug; |
2812 | scm_t_debug_info *debug_info_end; | |
1646d37b | 2813 | debug.prev = scm_last_debug_frame; |
020c890c | 2814 | debug.status = 0; |
04b6c081 | 2815 | /* |
92c2555f | 2816 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
2817 | * user has specified with (debug-set! frames <n>). |
2818 | * | |
2819 | * Even frames are eval frames, odd frames are apply frames. | |
2820 | */ | |
92c2555f | 2821 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 2822 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
2823 | debug.info = debug.vect; |
2824 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
2825 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 2826 | #endif |
b7ff98dd | 2827 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 2828 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 2829 | { |
b7ff98dd | 2830 | #ifdef DEVAL |
6dbd0af5 MD |
2831 | debug.info->e.exp = x; |
2832 | debug.info->e.env = env; | |
b7ff98dd | 2833 | #endif |
6dbd0af5 MD |
2834 | scm_report_stack_overflow (); |
2835 | } | |
2836 | #endif | |
6a0f6ff3 | 2837 | |
6dbd0af5 MD |
2838 | #ifdef DEVAL |
2839 | goto start; | |
2840 | #endif | |
6a0f6ff3 | 2841 | |
6dbd0af5 MD |
2842 | loop: |
2843 | #ifdef DEVAL | |
b7ff98dd MD |
2844 | SCM_CLEAR_ARGSREADY (debug); |
2845 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 2846 | --debug.info; |
04b6c081 MD |
2847 | /* |
2848 | * In theory, this should be the only place where it is necessary to | |
2849 | * check for space in debug.vect since both eval frames and | |
2850 | * available space are even. | |
2851 | * | |
2852 | * For this to be the case, however, it is necessary that primitive | |
2853 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 2854 | * label call PREP_APPLY. |
04b6c081 | 2855 | */ |
c0ab1b8d | 2856 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 2857 | { |
b7ff98dd | 2858 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
2859 | debug.info -= 2; |
2860 | } | |
6a0f6ff3 | 2861 | |
6dbd0af5 MD |
2862 | start: |
2863 | debug.info->e.exp = x; | |
2864 | debug.info->e.env = env; | |
5132eef0 DH |
2865 | if (scm_check_entry_p && SCM_TRAPS_P) |
2866 | { | |
bc76d628 DH |
2867 | if (SCM_ENTER_FRAME_P |
2868 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 2869 | { |
bc76d628 DH |
2870 | SCM stackrep; |
2871 | SCM tail = SCM_BOOL (SCM_TAILRECP (debug)); | |
5132eef0 DH |
2872 | SCM_SET_TAILREC (debug); |
2873 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 2874 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
2875 | else |
2876 | { | |
2877 | int first; | |
2878 | SCM val = scm_make_continuation (&first); | |
2879 | ||
2880 | if (first) | |
bc76d628 | 2881 | stackrep = val; |
5132eef0 DH |
2882 | else |
2883 | { | |
2884 | x = val; | |
2885 | if (SCM_IMP (x)) | |
2886 | RETURN (x); | |
2887 | else | |
2888 | /* This gives the possibility for the debugger to | |
2889 | modify the source expression before evaluation. */ | |
2890 | goto dispatch; | |
2891 | } | |
2892 | } | |
2893 | SCM_TRAPS_P = 0; | |
2894 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
2895 | scm_sym_enter_frame, | |
bc76d628 | 2896 | stackrep, |
5132eef0 DH |
2897 | tail, |
2898 | scm_unmemocopy (x, env)); | |
2899 | SCM_TRAPS_P = 1; | |
2900 | } | |
2901 | } | |
6dbd0af5 | 2902 | #endif |
f8769b1d | 2903 | dispatch: |
9cb5124f | 2904 | SCM_TICK; |
0f2d19dd JB |
2905 | switch (SCM_TYP7 (x)) |
2906 | { | |
1b43d24c | 2907 | case SCM_BIT7 (SCM_IM_AND): |
0f2d19dd | 2908 | x = SCM_CDR (x); |
302c12b4 DH |
2909 | while (!SCM_NULLP (SCM_CDR (x))) |
2910 | { | |
38ace99e DH |
2911 | SCM test_result = EVALCAR (x, env); |
2912 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
0f2d19dd | 2913 | RETURN (SCM_BOOL_F); |
302c12b4 DH |
2914 | else |
2915 | x = SCM_CDR (x); | |
2916 | } | |
6dbd0af5 | 2917 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2918 | goto carloop; |
2919 | ||
1b43d24c | 2920 | case SCM_BIT7 (SCM_IM_BEGIN): |
e050d4f8 DH |
2921 | x = SCM_CDR (x); |
2922 | if (SCM_NULLP (x)) | |
b8113bc8 MV |
2923 | RETURN (SCM_UNSPECIFIED); |
2924 | ||
6dbd0af5 | 2925 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2926 | |
2927 | begin: | |
4163eb72 MV |
2928 | /* If we are on toplevel with a lookup closure, we need to sync |
2929 | with the current module. */ | |
22a52da1 | 2930 | if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env))) |
4163eb72 | 2931 | { |
d9d39d76 | 2932 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2933 | while (!SCM_NULLP (SCM_CDR (x))) |
4163eb72 | 2934 | { |
5280aaca | 2935 | EVALCAR (x, env); |
d9d39d76 | 2936 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2937 | x = SCM_CDR (x); |
4163eb72 | 2938 | } |
5280aaca | 2939 | goto carloop; |
4163eb72 MV |
2940 | } |
2941 | else | |
5280aaca MV |
2942 | goto nontoplevel_begin; |
2943 | ||
5280aaca | 2944 | nontoplevel_begin: |
302c12b4 | 2945 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 2946 | { |
6a0f6ff3 DH |
2947 | SCM form = SCM_CAR (x); |
2948 | if (SCM_IMP (form)) | |
26d5b9b4 | 2949 | { |
6a0f6ff3 | 2950 | if (SCM_ISYMP (form)) |
26d5b9b4 | 2951 | { |
28d52ebb | 2952 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2953 | /* check for race condition */ |
2954 | if (SCM_ISYMP (SCM_CAR (x))) | |
9d4bf6d3 | 2955 | m_expand_body (x, env); |
28d52ebb | 2956 | scm_rec_mutex_unlock (&source_mutex); |
5280aaca | 2957 | goto nontoplevel_begin; |
26d5b9b4 | 2958 | } |
4163eb72 | 2959 | else |
6a0f6ff3 | 2960 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); |
26d5b9b4 | 2961 | } |
5280aaca | 2962 | else |
6a0f6ff3 | 2963 | SCM_CEVAL (form, env); |
302c12b4 | 2964 | x = SCM_CDR (x); |
0f2d19dd | 2965 | } |
5280aaca | 2966 | |
6a0f6ff3 DH |
2967 | carloop: |
2968 | { | |
2969 | /* scm_eval last form in list */ | |
2970 | SCM last_form = SCM_CAR (x); | |
0f2d19dd | 2971 | |
6a0f6ff3 DH |
2972 | if (SCM_CONSP (last_form)) |
2973 | { | |
2974 | /* This is by far the most frequent case. */ | |
2975 | x = last_form; | |
2976 | goto loop; /* tail recurse */ | |
2977 | } | |
2978 | else if (SCM_IMP (last_form)) | |
2979 | RETURN (SCM_EVALIM (last_form, env)); | |
2980 | else if (SCM_VARIABLEP (last_form)) | |
2981 | RETURN (SCM_VARIABLE_REF (last_form)); | |
2982 | else if (SCM_SYMBOLP (last_form)) | |
2983 | RETURN (*scm_lookupcar (x, env, 1)); | |
2984 | else | |
2985 | RETURN (last_form); | |
2986 | } | |
0f2d19dd JB |
2987 | |
2988 | ||
1b43d24c | 2989 | case SCM_BIT7 (SCM_IM_CASE): |
0f2d19dd | 2990 | x = SCM_CDR (x); |
6a0f6ff3 DH |
2991 | { |
2992 | SCM key = EVALCAR (x, env); | |
2993 | x = SCM_CDR (x); | |
2994 | while (!SCM_NULLP (x)) | |
2995 | { | |
2996 | SCM clause = SCM_CAR (x); | |
2997 | SCM labels = SCM_CAR (clause); | |
2a6f7afe | 2998 | if (SCM_EQ_P (labels, SCM_IM_ELSE)) |
6a0f6ff3 DH |
2999 | { |
3000 | x = SCM_CDR (clause); | |
3001 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3002 | goto begin; | |
3003 | } | |
3004 | while (!SCM_NULLP (labels)) | |
3005 | { | |
3006 | SCM label = SCM_CAR (labels); | |
3007 | if (SCM_EQ_P (label, key) || !SCM_FALSEP (scm_eqv_p (label, key))) | |
3008 | { | |
3009 | x = SCM_CDR (clause); | |
3010 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3011 | goto begin; | |
3012 | } | |
3013 | labels = SCM_CDR (labels); | |
3014 | } | |
3015 | x = SCM_CDR (x); | |
3016 | } | |
3017 | } | |
ddea3325 | 3018 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3019 | |
3020 | ||
1b43d24c | 3021 | case SCM_BIT7 (SCM_IM_COND): |
8ea46249 DH |
3022 | x = SCM_CDR (x); |
3023 | while (!SCM_NULLP (x)) | |
0f2d19dd | 3024 | { |
e5cb71a0 | 3025 | SCM clause = SCM_CAR (x); |
609a8b86 | 3026 | if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE)) |
8ea46249 | 3027 | { |
e5cb71a0 | 3028 | x = SCM_CDR (clause); |
8ea46249 DH |
3029 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3030 | goto begin; | |
3031 | } | |
e5cb71a0 | 3032 | else |
0f2d19dd | 3033 | { |
dff98306 DH |
3034 | arg1 = EVALCAR (clause, env); |
3035 | if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1)) | |
6dbd0af5 | 3036 | { |
e5cb71a0 DH |
3037 | x = SCM_CDR (clause); |
3038 | if (SCM_NULLP (x)) | |
dff98306 | 3039 | RETURN (arg1); |
609a8b86 | 3040 | else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW)) |
e5cb71a0 DH |
3041 | { |
3042 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3043 | goto begin; | |
3044 | } | |
3045 | else | |
3046 | { | |
3047 | proc = SCM_CDR (x); | |
3048 | proc = EVALCAR (proc, env); | |
dff98306 | 3049 | PREP_APPLY (proc, scm_list_1 (arg1)); |
e5cb71a0 | 3050 | ENTER_APPLY; |
ddd8f927 | 3051 | goto evap1; |
e5cb71a0 | 3052 | } |
6dbd0af5 | 3053 | } |
e5cb71a0 | 3054 | x = SCM_CDR (x); |
0f2d19dd JB |
3055 | } |
3056 | } | |
ddea3325 | 3057 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3058 | |
3059 | ||
1b43d24c | 3060 | case SCM_BIT7 (SCM_IM_DO): |
0f2d19dd | 3061 | x = SCM_CDR (x); |
e5cb71a0 DH |
3062 | { |
3063 | /* Compute the initialization values and the initial environment. */ | |
e681d187 | 3064 | SCM init_forms = SCM_CAR (x); |
e5cb71a0 DH |
3065 | SCM init_values = SCM_EOL; |
3066 | while (!SCM_NULLP (init_forms)) | |
3067 | { | |
3068 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3069 | init_forms = SCM_CDR (init_forms); | |
3070 | } | |
e681d187 | 3071 | x = SCM_CDR (x); |
821f18a4 | 3072 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
e5cb71a0 | 3073 | } |
e681d187 | 3074 | x = SCM_CDR (x); |
e5cb71a0 DH |
3075 | { |
3076 | SCM test_form = SCM_CAR (x); | |
3077 | SCM body_forms = SCM_CADR (x); | |
3078 | SCM step_forms = SCM_CDDR (x); | |
3079 | ||
3080 | SCM test_result = EVALCAR (test_form, env); | |
3081 | ||
3082 | while (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
3083 | { | |
0f2d19dd | 3084 | { |
e5cb71a0 DH |
3085 | /* Evaluate body forms. */ |
3086 | SCM temp_forms; | |
3087 | for (temp_forms = body_forms; | |
3088 | !SCM_NULLP (temp_forms); | |
3089 | temp_forms = SCM_CDR (temp_forms)) | |
3090 | { | |
3091 | SCM form = SCM_CAR (temp_forms); | |
3092 | /* Dirk:FIXME: We only need to eval forms, that may have a | |
3093 | * side effect here. This is only true for forms that start | |
3094 | * with a pair. All others are just constants. However, | |
3095 | * since in the common case there is no constant expression | |
3096 | * in a body of a do form, we just check for immediates here | |
3097 | * and have SCM_CEVAL take care of other cases. In the long | |
3098 | * run it would make sense to get rid of this test and have | |
3099 | * the macro transformer of 'do' eliminate all forms that | |
3100 | * have no sideeffect. */ | |
3101 | if (!SCM_IMP (form)) | |
3102 | SCM_CEVAL (form, env); | |
3103 | } | |
0f2d19dd | 3104 | } |
e5cb71a0 DH |
3105 | |
3106 | { | |
3107 | /* Evaluate the step expressions. */ | |
3108 | SCM temp_forms; | |
3109 | SCM step_values = SCM_EOL; | |
3110 | for (temp_forms = step_forms; | |
3111 | !SCM_NULLP (temp_forms); | |
3112 | temp_forms = SCM_CDR (temp_forms)) | |
3113 | { | |
3114 | SCM value = EVALCAR (temp_forms, env); | |
3115 | step_values = scm_cons (value, step_values); | |
3116 | } | |
821f18a4 DH |
3117 | env = SCM_EXTEND_ENV (SCM_CAAR (env), |
3118 | step_values, | |
3119 | SCM_CDR (env)); | |
e5cb71a0 DH |
3120 | } |
3121 | ||
3122 | test_result = EVALCAR (test_form, env); | |
3123 | } | |
3124 | } | |
3125 | x = SCM_CDAR (x); | |
0f2d19dd | 3126 | if (SCM_NULLP (x)) |
6dbd0af5 MD |
3127 | RETURN (SCM_UNSPECIFIED); |
3128 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
5280aaca | 3129 | goto nontoplevel_begin; |
0f2d19dd JB |
3130 | |
3131 | ||
1b43d24c | 3132 | case SCM_BIT7 (SCM_IM_IF): |
0f2d19dd | 3133 | x = SCM_CDR (x); |
38ace99e DH |
3134 | { |
3135 | SCM test_result = EVALCAR (x, env); | |
4610b011 DH |
3136 | x = SCM_CDR (x); /* then expression */ |
3137 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
38ace99e | 3138 | { |
4610b011 | 3139 | x = SCM_CDR (x); /* else expression */ |
38ace99e DH |
3140 | if (SCM_NULLP (x)) |
3141 | RETURN (SCM_UNSPECIFIED); | |
3142 | } | |
3143 | } | |
6dbd0af5 | 3144 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3145 | goto carloop; |
3146 | ||
3147 | ||
1b43d24c | 3148 | case SCM_BIT7 (SCM_IM_LET): |
0f2d19dd | 3149 | x = SCM_CDR (x); |
38ace99e DH |
3150 | { |
3151 | SCM init_forms = SCM_CADR (x); | |
3152 | SCM init_values = SCM_EOL; | |
3153 | do | |
3154 | { | |
3155 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3156 | init_forms = SCM_CDR (init_forms); | |
3157 | } | |
3158 | while (!SCM_NULLP (init_forms)); | |
821f18a4 | 3159 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
38ace99e | 3160 | } |
e050d4f8 DH |
3161 | x = SCM_CDDR (x); |
3162 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3163 | goto nontoplevel_begin; | |
0f2d19dd JB |
3164 | |
3165 | ||
1b43d24c | 3166 | case SCM_BIT7 (SCM_IM_LETREC): |
0f2d19dd | 3167 | x = SCM_CDR (x); |
821f18a4 | 3168 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); |
0f2d19dd | 3169 | x = SCM_CDR (x); |
38ace99e DH |
3170 | { |
3171 | SCM init_forms = SCM_CAR (x); | |
3172 | SCM init_values = SCM_EOL; | |
3173 | do | |
3174 | { | |
3175 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3176 | init_forms = SCM_CDR (init_forms); | |
3177 | } | |
3178 | while (!SCM_NULLP (init_forms)); | |
3179 | SCM_SETCDR (SCM_CAR (env), init_values); | |
3180 | } | |
e050d4f8 DH |
3181 | x = SCM_CDR (x); |
3182 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3183 | goto nontoplevel_begin; | |
0f2d19dd JB |
3184 | |
3185 | ||
1b43d24c | 3186 | case SCM_BIT7 (SCM_IM_LETSTAR): |
0f2d19dd | 3187 | x = SCM_CDR (x); |
302c12b4 DH |
3188 | { |
3189 | SCM bindings = SCM_CAR (x); | |
3190 | if (SCM_NULLP (bindings)) | |
821f18a4 | 3191 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
302c12b4 DH |
3192 | else |
3193 | { | |
3194 | do | |
3195 | { | |
3196 | SCM name = SCM_CAR (bindings); | |
3197 | SCM init = SCM_CDR (bindings); | |
821f18a4 | 3198 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); |
302c12b4 DH |
3199 | bindings = SCM_CDR (init); |
3200 | } | |
3201 | while (!SCM_NULLP (bindings)); | |
3202 | } | |
3203 | } | |
e050d4f8 DH |
3204 | x = SCM_CDR (x); |
3205 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3206 | goto nontoplevel_begin; | |
0f2d19dd | 3207 | |
302c12b4 | 3208 | |
1b43d24c | 3209 | case SCM_BIT7 (SCM_IM_OR): |
0f2d19dd | 3210 | x = SCM_CDR (x); |
302c12b4 | 3211 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 3212 | { |
302c12b4 | 3213 | SCM val = EVALCAR (x, env); |
c96d76b8 | 3214 | if (!SCM_FALSEP (val) && !SCM_NILP (val)) |
302c12b4 DH |
3215 | RETURN (val); |
3216 | else | |
3217 | x = SCM_CDR (x); | |
0f2d19dd | 3218 | } |
6dbd0af5 | 3219 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3220 | goto carloop; |
3221 | ||
3222 | ||
1b43d24c | 3223 | case SCM_BIT7 (SCM_IM_LAMBDA): |
0f2d19dd JB |
3224 | RETURN (scm_closure (SCM_CDR (x), env)); |
3225 | ||
3226 | ||
1b43d24c | 3227 | case SCM_BIT7 (SCM_IM_QUOTE): |
8ea46249 | 3228 | RETURN (SCM_CADR (x)); |
0f2d19dd JB |
3229 | |
3230 | ||
1b43d24c | 3231 | case SCM_BIT7 (SCM_IM_SET_X): |
0f2d19dd | 3232 | x = SCM_CDR (x); |
38ace99e DH |
3233 | { |
3234 | SCM *location; | |
3235 | SCM variable = SCM_CAR (x); | |
e050d4f8 | 3236 | if (SCM_ILOCP (variable)) |
38ace99e | 3237 | location = scm_ilookup (variable, env); |
3063e30a | 3238 | else if (SCM_VARIABLEP (variable)) |
e050d4f8 | 3239 | location = SCM_VARIABLE_LOC (variable); |
38ace99e DH |
3240 | else /* (SCM_SYMBOLP (variable)) is known to be true */ |
3241 | location = scm_lookupcar (x, env, 1); | |
3242 | x = SCM_CDR (x); | |
3243 | *location = EVALCAR (x, env); | |
3244 | } | |
0f2d19dd | 3245 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3246 | |
3247 | ||
0f2d19dd | 3248 | /* new syntactic forms go here. */ |
1b43d24c | 3249 | case SCM_BIT7 (SCM_MAKISYM (0)): |
0f2d19dd | 3250 | proc = SCM_CAR (x); |
a392ee15 | 3251 | switch (SCM_ISYMNUM (proc)) |
0f2d19dd | 3252 | { |
3f04400d DH |
3253 | |
3254 | ||
0f2d19dd | 3255 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
6bff1368 | 3256 | /* Evaluate the procedure to be applied. */ |
e910e9d2 DH |
3257 | x = SCM_CDR (x); |
3258 | proc = EVALCAR (x, env); | |
3259 | PREP_APPLY (proc, SCM_EOL); | |
6bff1368 DH |
3260 | |
3261 | /* Evaluate the argument holding the list of arguments */ | |
e910e9d2 DH |
3262 | x = SCM_CDR (x); |
3263 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3264 | |
3265 | apply_proc: | |
3266 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3267 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3268 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3269 | if (SCM_CLOSUREP (proc)) |
3270 | { | |
9a069bdd | 3271 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3272 | #ifdef DEVAL |
9a069bdd | 3273 | debug.info->a.args = arg1; |
6dbd0af5 | 3274 | #endif |
9a069bdd DH |
3275 | if (scm_badargsp (formals, arg1)) |
3276 | scm_wrong_num_args (proc); | |
3277 | ENTER_APPLY; | |
3278 | /* Copy argument list */ | |
3279 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3280 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3281 | else | |
3282 | { | |
3283 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3284 | SCM tail = args; | |
3285 | arg1 = SCM_CDR (arg1); | |
3286 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3287 | { | |
3288 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3289 | SCM_SETCDR (tail, new_tail); | |
3290 | tail = new_tail; | |
3291 | arg1 = SCM_CDR (arg1); | |
3292 | } | |
3293 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3294 | } | |
3295 | ||
3296 | x = SCM_CLOSURE_BODY (proc); | |
3297 | goto nontoplevel_begin; | |
0f2d19dd | 3298 | } |
3f04400d DH |
3299 | else |
3300 | { | |
e910e9d2 DH |
3301 | ENTER_APPLY; |
3302 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3303 | } |
3304 | ||
0f2d19dd JB |
3305 | |
3306 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
5f144b10 GH |
3307 | { |
3308 | int first; | |
3309 | SCM val = scm_make_continuation (&first); | |
3310 | ||
e050d4f8 | 3311 | if (!first) |
5f144b10 | 3312 | RETURN (val); |
e050d4f8 DH |
3313 | else |
3314 | { | |
3315 | arg1 = val; | |
3316 | proc = SCM_CDR (x); | |
6bff1368 | 3317 | proc = EVALCAR (proc, env); |
e050d4f8 DH |
3318 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3319 | ENTER_APPLY; | |
e050d4f8 DH |
3320 | goto evap1; |
3321 | } | |
5f144b10 | 3322 | } |
e050d4f8 | 3323 | |
0f2d19dd | 3324 | |
a570e93a | 3325 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3326 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3327 | |
e050d4f8 | 3328 | |
28d52ebb MD |
3329 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
3330 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); | |
3331 | ||
3332 | ||
c8e1d354 MD |
3333 | /* PLACEHOLDER for case (SCM_ISYMNUM (SCM_IM_DISPATCH)): The |
3334 | following code (type_dispatch) is intended to be the tail | |
3335 | of the case clause for the internal macro | |
3336 | SCM_IM_DISPATCH. Please don't remove it from this | |
3337 | location without discussing it with Mikael | |
3338 | <djurfeldt@nada.kth.se> */ | |
3339 | ||
f12745b6 DH |
3340 | /* The type dispatch code is duplicated below |
3341 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3342 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3343 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3344 | /* Type dispatch means to determine from the types of the function |
3345 | * arguments (i. e. the 'signature' of the call), which method from | |
3346 | * a generic function is to be called. This process of selecting | |
3347 | * the right method takes some time. To speed it up, guile uses | |
3348 | * caching: Together with the macro call to dispatch the signatures | |
3349 | * of some previous calls to that generic function from the same | |
3350 | * place are stored (in the code!) in a cache that we call the | |
3351 | * 'method cache'. This is done since it is likely, that | |
3352 | * consecutive calls to dispatch from that position in the code will | |
3353 | * have the same signature. Thus, the type dispatch works as | |
3354 | * follows: First, determine a hash value from the signature of the | |
3355 | * actual arguments. Second, use this hash value as an index to | |
3356 | * find that same signature in the method cache stored at this | |
3357 | * position in the code. If found, you have also found the | |
3358 | * corresponding method that belongs to that signature. If the | |
3359 | * signature is not found in the method cache, you have to perform a | |
3360 | * full search over all signatures stored with the generic | |
3361 | * function. */ | |
3362 | { | |
3363 | unsigned long int specializers; | |
3364 | unsigned long int hash_value; | |
3365 | unsigned long int cache_end_pos; | |
3366 | unsigned long int mask; | |
3367 | SCM method_cache; | |
3368 | ||
3369 | { | |
3370 | SCM z = SCM_CDDR (x); | |
3371 | SCM tmp = SCM_CADR (z); | |
3372 | specializers = SCM_INUM (SCM_CAR (z)); | |
3373 | ||
3374 | /* Compute a hash value for searching the method cache. There | |
3375 | * are two variants for computing the hash value, a (rather) | |
3376 | * complicated one, and a simple one. For the complicated one | |
3377 | * explained below, tmp holds a number that is used in the | |
3378 | * computation. */ | |
3379 | if (SCM_INUMP (tmp)) | |
3380 | { | |
3381 | /* Use the signature of the actual arguments to determine | |
3382 | * the hash value. This is done as follows: Each class has | |
3383 | * an array of random numbers, that are determined when the | |
3384 | * class is created. The integer 'hashset' is an index into | |
3385 | * that array of random numbers. Now, from all classes that | |
3386 | * are part of the signature of the actual arguments, the | |
3387 | * random numbers at index 'hashset' are taken and summed | |
3388 | * up, giving the hash value. The value of 'hashset' is | |
3389 | * stored at the call to dispatch. This allows to have | |
3390 | * different 'formulas' for calculating the hash value at | |
3391 | * different places where dispatch is called. This allows | |
3392 | * to optimize the hash formula at every individual place | |
3393 | * where dispatch is called, such that hopefully the hash | |
3394 | * value that is computed will directly point to the right | |
3395 | * method in the method cache. */ | |
3396 | unsigned long int hashset = SCM_INUM (tmp); | |
3397 | unsigned long int counter = specializers + 1; | |
dff98306 | 3398 | SCM tmp_arg = arg1; |
f12745b6 DH |
3399 | hash_value = 0; |
3400 | while (!SCM_NULLP (tmp_arg) && counter != 0) | |
61364ba6 | 3401 | { |
f12745b6 DH |
3402 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3403 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3404 | tmp_arg = SCM_CDR (tmp_arg); | |
3405 | counter--; | |
61364ba6 | 3406 | } |
f12745b6 DH |
3407 | z = SCM_CDDR (z); |
3408 | method_cache = SCM_CADR (z); | |
3409 | mask = SCM_INUM (SCM_CAR (z)); | |
3410 | hash_value &= mask; | |
3411 | cache_end_pos = hash_value; | |
3412 | } | |
3413 | else | |
3414 | { | |
3415 | /* This method of determining the hash value is much | |
3416 | * simpler: Set the hash value to zero and just perform a | |
3417 | * linear search through the method cache. */ | |
3418 | method_cache = tmp; | |
3419 | mask = (unsigned long int) ((long) -1); | |
3420 | hash_value = 0; | |
3421 | cache_end_pos = SCM_VECTOR_LENGTH (method_cache); | |
3422 | } | |
3423 | } | |
61364ba6 | 3424 | |
f12745b6 DH |
3425 | { |
3426 | /* Search the method cache for a method with a matching | |
3427 | * signature. Start the search at position 'hash_value'. The | |
3428 | * hashing implementation uses linear probing for conflict | |
3429 | * resolution, that is, if the signature in question is not | |
3430 | * found at the starting index in the hash table, the next table | |
3431 | * entry is tried, and so on, until in the worst case the whole | |
3432 | * cache has been searched, but still the signature has not been | |
3433 | * found. */ | |
3434 | SCM z; | |
3435 | do | |
3436 | { | |
dff98306 | 3437 | SCM args = arg1; /* list of arguments */ |
f12745b6 DH |
3438 | z = SCM_VELTS (method_cache)[hash_value]; |
3439 | while (!SCM_NULLP (args)) | |
61364ba6 MD |
3440 | { |
3441 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 DH |
3442 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
3443 | if (!SCM_EQ_P (class_of_arg, SCM_CAR (z))) | |
61364ba6 | 3444 | goto next_method; |
f12745b6 | 3445 | args = SCM_CDR (args); |
61364ba6 MD |
3446 | z = SCM_CDR (z); |
3447 | } | |
f12745b6 DH |
3448 | /* Fewer arguments than specifiers => CAR != ENV */ |
3449 | if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))) | |
3450 | goto apply_cmethod; | |
3451 | next_method: | |
3452 | hash_value = (hash_value + 1) & mask; | |
3453 | } while (hash_value != cache_end_pos); | |
3454 | ||
3455 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3456 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3457 | |
dff98306 | 3458 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3459 | { |
3460 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3461 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3462 | x = SCM_CMETHOD_BODY (z); |
3463 | goto nontoplevel_begin; | |
3464 | } | |
3465 | } | |
61364ba6 | 3466 | } |
73b64342 | 3467 | |
1d15ecd3 | 3468 | |
ca4be6ea MD |
3469 | case (SCM_ISYMNUM (SCM_IM_SLOT_REF)): |
3470 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3471 | { |
3472 | SCM instance = EVALCAR (x, env); | |
3473 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3474 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); | |
3475 | } | |
3476 | ||
3477 | ||
ca4be6ea MD |
3478 | case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X)): |
3479 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3480 | { |
3481 | SCM instance = EVALCAR (x, env); | |
3482 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3483 | SCM value = EVALCAR (SCM_CDDR (x), env); | |
3484 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3485 | RETURN (SCM_UNSPECIFIED); | |
3486 | } | |
3487 | ||
c96d76b8 | 3488 | |
22721140 | 3489 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3490 | |
73b64342 | 3491 | case (SCM_ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3492 | { |
3493 | SCM test_form = SCM_CDR (x); | |
3494 | x = SCM_CDR (test_form); | |
3495 | while (!SCM_NULL_OR_NIL_P (x)) | |
3496 | { | |
3497 | SCM test_result = EVALCAR (test_form, env); | |
3498 | if (!(SCM_FALSEP (test_result) | |
3499 | || SCM_NULL_OR_NIL_P (test_result))) | |
3500 | { | |
3501 | if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED)) | |
3502 | RETURN (test_result); | |
3503 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3504 | goto carloop; | |
3505 | } | |
3506 | else | |
3507 | { | |
3508 | test_form = SCM_CDR (x); | |
3509 | x = SCM_CDR (test_form); | |
3510 | } | |
3511 | } | |
3512 | x = test_form; | |
3513 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3514 | goto carloop; | |
3515 | } | |
73b64342 | 3516 | |
c96d76b8 | 3517 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 MD |
3518 | |
3519 | case (SCM_ISYMNUM (SCM_IM_BIND)): | |
2e171178 MV |
3520 | { |
3521 | SCM vars, exps, vals; | |
73b64342 | 3522 | |
2e171178 MV |
3523 | x = SCM_CDR (x); |
3524 | vars = SCM_CAAR (x); | |
3525 | exps = SCM_CDAR (x); | |
2e171178 | 3526 | vals = SCM_EOL; |
82b3e2c6 | 3527 | while (!SCM_NULLP (exps)) |
2e171178 MV |
3528 | { |
3529 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3530 | exps = SCM_CDR (exps); | |
3531 | } | |
3532 | ||
3533 | scm_swap_bindings (vars, vals); | |
3534 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3535 | |
3536 | /* Ignore all but the last evaluation result. */ | |
3537 | for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x)) | |
2e171178 | 3538 | { |
1d15ecd3 DH |
3539 | if (SCM_CONSP (SCM_CAR (x))) |
3540 | SCM_CEVAL (SCM_CAR (x), env); | |
2e171178 MV |
3541 | } |
3542 | proc = EVALCAR (x, env); | |
73b64342 | 3543 | |
2e171178 MV |
3544 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3545 | scm_swap_bindings (vars, vals); | |
73b64342 | 3546 | |
ddea3325 | 3547 | RETURN (proc); |
2e171178 | 3548 | } |
c96d76b8 | 3549 | |
1d15ecd3 | 3550 | |
a513ead3 MV |
3551 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
3552 | { | |
9a069bdd DH |
3553 | SCM producer; |
3554 | ||
3555 | x = SCM_CDR (x); | |
3556 | producer = EVALCAR (x, env); | |
3557 | x = SCM_CDR (x); | |
3558 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3559 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3560 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3561 | { |
3562 | /* The list of arguments is not copied. Rather, it is assumed | |
3563 | * that this has been done by the 'values' procedure. */ | |
3564 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3565 | } | |
a513ead3 | 3566 | else |
82b3e2c6 DH |
3567 | { |
3568 | arg1 = scm_list_1 (arg1); | |
3569 | } | |
9a069bdd DH |
3570 | PREP_APPLY (proc, arg1); |
3571 | goto apply_proc; | |
a513ead3 MV |
3572 | } |
3573 | ||
b7798e10 | 3574 | |
0f2d19dd | 3575 | default: |
ddd8f927 | 3576 | goto evapply; |
0f2d19dd JB |
3577 | } |
3578 | ||
89bff2fc | 3579 | |
0f2d19dd JB |
3580 | default: |
3581 | proc = x; | |
ddd8f927 | 3582 | goto evapply; |
82b3e2c6 | 3583 | |
89bff2fc | 3584 | |
0f2d19dd JB |
3585 | case scm_tc7_vector: |
3586 | case scm_tc7_wvect: | |
22721140 | 3587 | #if SCM_HAVE_ARRAYS |
0f2d19dd JB |
3588 | case scm_tc7_bvect: |
3589 | case scm_tc7_byvect: | |
3590 | case scm_tc7_svect: | |
3591 | case scm_tc7_ivect: | |
3592 | case scm_tc7_uvect: | |
3593 | case scm_tc7_fvect: | |
3594 | case scm_tc7_dvect: | |
3595 | case scm_tc7_cvect: | |
3d05f2e0 | 3596 | #if SCM_SIZEOF_LONG_LONG != 0 |
0f2d19dd | 3597 | case scm_tc7_llvect: |
afe5177e | 3598 | #endif |
0f2d19dd | 3599 | #endif |
534c55a9 | 3600 | case scm_tc7_number: |
0f2d19dd | 3601 | case scm_tc7_string: |
0f2d19dd JB |
3602 | case scm_tc7_smob: |
3603 | case scm_tcs_closures: | |
224822be | 3604 | case scm_tc7_cclo: |
89efbff4 | 3605 | case scm_tc7_pws: |
0f2d19dd | 3606 | case scm_tcs_subrs: |
904a077d | 3607 | case scm_tcs_struct: |
fc22b297 | 3608 | case scm_tc7_port: |
0f2d19dd JB |
3609 | RETURN (x); |
3610 | ||
89bff2fc DH |
3611 | case scm_tc7_symbol: |
3612 | /* Only happens when called at top level. */ | |
3613 | x = scm_cons (x, SCM_UNDEFINED); | |
3614 | RETURN (*scm_lookupcar (x, env, 1)); | |
3615 | ||
d22a0ea1 | 3616 | case scm_tc7_variable: |
a130e982 | 3617 | RETURN (SCM_VARIABLE_REF(x)); |
d22a0ea1 | 3618 | |
1b43d24c | 3619 | case SCM_BIT7 (SCM_ILOC00): |
0f2d19dd | 3620 | proc = *scm_ilookup (SCM_CAR (x), env); |
ddd8f927 | 3621 | goto checkmacro; |
b7798e10 | 3622 | |
0f2d19dd | 3623 | case scm_tcs_cons_nimcar: |
e050d4f8 | 3624 | if (SCM_SYMBOLP (SCM_CAR (x))) |
0f2d19dd | 3625 | { |
e050d4f8 | 3626 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3627 | { |
3628 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3629 | if (location == NULL) | |
3630 | { | |
3631 | /* we have lost the race, start again. */ | |
3632 | goto dispatch; | |
3633 | } | |
3634 | proc = *location; | |
3635 | } | |
f8769b1d | 3636 | |
22a52da1 | 3637 | if (SCM_MACROP (proc)) |
0f2d19dd | 3638 | { |
86d31dfe MV |
3639 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3640 | lookupcar */ | |
e050d4f8 | 3641 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3642 | #ifdef DEVAL |
7c354052 MD |
3643 | /* Set a flag during macro expansion so that macro |
3644 | application frames can be deleted from the backtrace. */ | |
3645 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3646 | #endif |
dff98306 | 3647 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
6bff1368 | 3648 | scm_cons (env, scm_listofnull)); |
7c354052 MD |
3649 | #ifdef DEVAL |
3650 | SCM_CLEAR_MACROEXP (debug); | |
3651 | #endif | |
22a52da1 | 3652 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3653 | { |
3b88ed2a | 3654 | case 3: |
0f2d19dd | 3655 | case 2: |
dff98306 DH |
3656 | if (scm_ilength (arg1) <= 0) |
3657 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); | |
6dbd0af5 | 3658 | #ifdef DEVAL |
22a52da1 | 3659 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3660 | { |
6dbd0af5 | 3661 | SCM_DEFER_INTS; |
dff98306 DH |
3662 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3663 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
3664 | SCM_ALLOW_INTS; |
3665 | goto dispatch; | |
3666 | } | |
3667 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
3668 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
3669 | SCM_CAR (x), | |
3670 | SCM_CDR (x)); | |
6dbd0af5 | 3671 | #endif |
0f2d19dd | 3672 | SCM_DEFER_INTS; |
dff98306 DH |
3673 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3674 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 3675 | SCM_ALLOW_INTS; |
680516ba DH |
3676 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3677 | goto loop; | |
3063e30a | 3678 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 3679 | case 1: |
680516ba DH |
3680 | x = arg1; |
3681 | if (SCM_NIMP (x)) | |
3682 | { | |
3683 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3684 | goto loop; | |
3685 | } | |
3686 | else | |
3687 | RETURN (arg1); | |
3063e30a | 3688 | #endif |
0f2d19dd | 3689 | case 0: |
dff98306 | 3690 | RETURN (arg1); |
0f2d19dd JB |
3691 | } |
3692 | } | |
3693 | } | |
3694 | else | |
3695 | proc = SCM_CEVAL (SCM_CAR (x), env); | |
bd987b8e | 3696 | |
ddd8f927 DH |
3697 | checkmacro: |
3698 | if (SCM_MACROP (proc)) | |
0f2d19dd | 3699 | goto handle_a_macro; |
0f2d19dd JB |
3700 | } |
3701 | ||
3702 | ||
e050d4f8 | 3703 | evapply: /* inputs: x, proc */ |
6dbd0af5 MD |
3704 | PREP_APPLY (proc, SCM_EOL); |
3705 | if (SCM_NULLP (SCM_CDR (x))) { | |
3706 | ENTER_APPLY; | |
89efbff4 | 3707 | evap0: |
ddd8f927 | 3708 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
3709 | switch (SCM_TYP7 (proc)) |
3710 | { /* no arguments given */ | |
3711 | case scm_tc7_subr_0: | |
3712 | RETURN (SCM_SUBRF (proc) ()); | |
3713 | case scm_tc7_subr_1o: | |
3714 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
3715 | case scm_tc7_lsubr: | |
3716 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
3717 | case scm_tc7_rpsubr: | |
3718 | RETURN (SCM_BOOL_T); | |
3719 | case scm_tc7_asubr: | |
3720 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 3721 | case scm_tc7_smob: |
68b06924 | 3722 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 3723 | goto badfun; |
68b06924 | 3724 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 3725 | case scm_tc7_cclo: |
dff98306 | 3726 | arg1 = proc; |
0f2d19dd | 3727 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
3728 | #ifdef DEVAL |
3729 | debug.info->a.proc = proc; | |
dff98306 | 3730 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3731 | #endif |
0f2d19dd | 3732 | goto evap1; |
89efbff4 MD |
3733 | case scm_tc7_pws: |
3734 | proc = SCM_PROCEDURE (proc); | |
3735 | #ifdef DEVAL | |
3736 | debug.info->a.proc = proc; | |
3737 | #endif | |
002f1a5d MD |
3738 | if (!SCM_CLOSUREP (proc)) |
3739 | goto evap0; | |
ddd8f927 | 3740 | /* fallthrough */ |
0f2d19dd | 3741 | case scm_tcs_closures: |
ddd8f927 DH |
3742 | { |
3743 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3744 | if (SCM_CONSP (formals)) | |
3745 | goto umwrongnumargs; | |
3746 | x = SCM_CLOSURE_BODY (proc); | |
3747 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3748 | goto nontoplevel_begin; | |
3749 | } | |
904a077d | 3750 | case scm_tcs_struct: |
195847fa MD |
3751 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
3752 | { | |
3753 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 3754 | arg1 = SCM_EOL; |
195847fa MD |
3755 | goto type_dispatch; |
3756 | } | |
2ca0d207 | 3757 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 3758 | { |
dff98306 | 3759 | arg1 = proc; |
195847fa MD |
3760 | proc = (SCM_I_ENTITYP (proc) |
3761 | ? SCM_ENTITY_PROCEDURE (proc) | |
3762 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 3763 | #ifdef DEVAL |
195847fa | 3764 | debug.info->a.proc = proc; |
dff98306 | 3765 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 3766 | #endif |
ddd8f927 | 3767 | goto evap1; |
da7f71d7 | 3768 | } |
2ca0d207 DH |
3769 | else |
3770 | goto badfun; | |
0f2d19dd JB |
3771 | case scm_tc7_subr_1: |
3772 | case scm_tc7_subr_2: | |
3773 | case scm_tc7_subr_2o: | |
14b18ed6 | 3774 | case scm_tc7_dsubr: |
0f2d19dd JB |
3775 | case scm_tc7_cxr: |
3776 | case scm_tc7_subr_3: | |
3777 | case scm_tc7_lsubr_2: | |
3778 | umwrongnumargs: | |
3779 | unmemocar (x, env); | |
f5bf2977 | 3780 | scm_wrong_num_args (proc); |
0f2d19dd | 3781 | default: |
ddd8f927 DH |
3782 | badfun: |
3783 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 3784 | } |
6dbd0af5 | 3785 | } |
0f2d19dd JB |
3786 | |
3787 | /* must handle macros by here */ | |
3788 | x = SCM_CDR (x); | |
dff98306 DH |
3789 | if (SCM_CONSP (x)) |
3790 | arg1 = EVALCAR (x, env); | |
680ed4a8 | 3791 | else |
ab1f1094 | 3792 | scm_wrong_num_args (proc); |
6dbd0af5 | 3793 | #ifdef DEVAL |
dff98306 | 3794 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3795 | #endif |
0f2d19dd | 3796 | x = SCM_CDR (x); |
42030fb2 DH |
3797 | { |
3798 | SCM arg2; | |
3799 | if (SCM_NULLP (x)) | |
3800 | { | |
3801 | ENTER_APPLY; | |
3802 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 3803 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3804 | switch (SCM_TYP7 (proc)) |
3805 | { /* have one argument in arg1 */ | |
3806 | case scm_tc7_subr_2o: | |
3807 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3808 | case scm_tc7_subr_1: | |
3809 | case scm_tc7_subr_1o: | |
3810 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
3811 | case scm_tc7_dsubr: |
3812 | if (SCM_INUMP (arg1)) | |
3813 | { | |
3814 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
3815 | } | |
3816 | else if (SCM_REALP (arg1)) | |
3817 | { | |
3818 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
3819 | } | |
3820 | else if (SCM_BIGP (arg1)) | |
3821 | { | |
3822 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
3823 | } | |
f92e85f7 MV |
3824 | else if (SCM_FRACTIONP (arg1)) |
3825 | { | |
3826 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
3827 | } | |
3828 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
14b18ed6 | 3829 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); |
42030fb2 | 3830 | case scm_tc7_cxr: |
42030fb2 | 3831 | { |
14b18ed6 DH |
3832 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
3833 | do | |
3834 | { | |
3835 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
3836 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
3837 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
3838 | pattern >>= 2; | |
3839 | } while (pattern); | |
42030fb2 | 3840 | RETURN (arg1); |
0f2d19dd | 3841 | } |
42030fb2 DH |
3842 | case scm_tc7_rpsubr: |
3843 | RETURN (SCM_BOOL_T); | |
3844 | case scm_tc7_asubr: | |
3845 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3846 | case scm_tc7_lsubr: | |
0f2d19dd | 3847 | #ifdef DEVAL |
42030fb2 | 3848 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 3849 | #else |
42030fb2 | 3850 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 3851 | #endif |
42030fb2 DH |
3852 | case scm_tc7_smob: |
3853 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3854 | goto badfun; | |
3855 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
3856 | case scm_tc7_cclo: | |
3857 | arg2 = arg1; | |
3858 | arg1 = proc; | |
3859 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 3860 | #ifdef DEVAL |
42030fb2 DH |
3861 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3862 | debug.info->a.proc = proc; | |
6dbd0af5 | 3863 | #endif |
42030fb2 DH |
3864 | goto evap2; |
3865 | case scm_tc7_pws: | |
3866 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 3867 | #ifdef DEVAL |
42030fb2 | 3868 | debug.info->a.proc = proc; |
89efbff4 | 3869 | #endif |
42030fb2 DH |
3870 | if (!SCM_CLOSUREP (proc)) |
3871 | goto evap1; | |
ddd8f927 | 3872 | /* fallthrough */ |
42030fb2 | 3873 | case scm_tcs_closures: |
ddd8f927 DH |
3874 | { |
3875 | /* clos1: */ | |
3876 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3877 | if (SCM_NULLP (formals) | |
3878 | || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals)))) | |
3879 | goto umwrongnumargs; | |
3880 | x = SCM_CLOSURE_BODY (proc); | |
0f2d19dd | 3881 | #ifdef DEVAL |
ddd8f927 DH |
3882 | env = SCM_EXTEND_ENV (formals, |
3883 | debug.info->a.args, | |
3884 | SCM_ENV (proc)); | |
0f2d19dd | 3885 | #else |
ddd8f927 DH |
3886 | env = SCM_EXTEND_ENV (formals, |
3887 | scm_list_1 (arg1), | |
3888 | SCM_ENV (proc)); | |
0f2d19dd | 3889 | #endif |
ddd8f927 DH |
3890 | goto nontoplevel_begin; |
3891 | } | |
42030fb2 DH |
3892 | case scm_tcs_struct: |
3893 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3894 | { | |
3895 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 3896 | #ifdef DEVAL |
42030fb2 | 3897 | arg1 = debug.info->a.args; |
f3d2630a | 3898 | #else |
42030fb2 | 3899 | arg1 = scm_list_1 (arg1); |
f3d2630a | 3900 | #endif |
42030fb2 DH |
3901 | goto type_dispatch; |
3902 | } | |
2ca0d207 | 3903 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3904 | { |
3905 | arg2 = arg1; | |
3906 | arg1 = proc; | |
3907 | proc = (SCM_I_ENTITYP (proc) | |
3908 | ? SCM_ENTITY_PROCEDURE (proc) | |
3909 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 3910 | #ifdef DEVAL |
42030fb2 DH |
3911 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3912 | debug.info->a.proc = proc; | |
0c32d76c | 3913 | #endif |
ddd8f927 | 3914 | goto evap2; |
42030fb2 | 3915 | } |
2ca0d207 DH |
3916 | else |
3917 | goto badfun; | |
42030fb2 DH |
3918 | case scm_tc7_subr_2: |
3919 | case scm_tc7_subr_0: | |
3920 | case scm_tc7_subr_3: | |
3921 | case scm_tc7_lsubr_2: | |
ab1f1094 | 3922 | scm_wrong_num_args (proc); |
42030fb2 DH |
3923 | default: |
3924 | goto badfun; | |
3925 | } | |
3926 | } | |
42030fb2 DH |
3927 | if (SCM_CONSP (x)) |
3928 | arg2 = EVALCAR (x, env); | |
3929 | else | |
ab1f1094 | 3930 | scm_wrong_num_args (proc); |
bd987b8e | 3931 | |
42030fb2 | 3932 | { /* have two or more arguments */ |
6dbd0af5 | 3933 | #ifdef DEVAL |
42030fb2 | 3934 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 3935 | #endif |
42030fb2 DH |
3936 | x = SCM_CDR (x); |
3937 | if (SCM_NULLP (x)) { | |
3938 | ENTER_APPLY; | |
3939 | evap2: | |
ddd8f927 | 3940 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3941 | switch (SCM_TYP7 (proc)) |
3942 | { /* have two arguments */ | |
3943 | case scm_tc7_subr_2: | |
3944 | case scm_tc7_subr_2o: | |
3945 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3946 | case scm_tc7_lsubr: | |
0f2d19dd | 3947 | #ifdef DEVAL |
42030fb2 | 3948 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 3949 | #else |
42030fb2 DH |
3950 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
3951 | #endif | |
3952 | case scm_tc7_lsubr_2: | |
3953 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
3954 | case scm_tc7_rpsubr: | |
3955 | case scm_tc7_asubr: | |
3956 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3957 | case scm_tc7_smob: | |
3958 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3959 | goto badfun; | |
3960 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
3961 | cclon: | |
3962 | case scm_tc7_cclo: | |
0f2d19dd | 3963 | #ifdef DEVAL |
42030fb2 DH |
3964 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3965 | scm_cons (proc, debug.info->a.args), | |
3966 | SCM_EOL)); | |
0f2d19dd | 3967 | #else |
42030fb2 DH |
3968 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3969 | scm_cons2 (proc, arg1, | |
3970 | scm_cons (arg2, | |
3971 | scm_eval_args (x, | |
3972 | env, | |
3973 | proc))), | |
3974 | SCM_EOL)); | |
3975 | #endif | |
3976 | case scm_tcs_struct: | |
3977 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3978 | { | |
3979 | x = SCM_ENTITY_PROCEDURE (proc); | |
3980 | #ifdef DEVAL | |
3981 | arg1 = debug.info->a.args; | |
3982 | #else | |
3983 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 3984 | #endif |
42030fb2 DH |
3985 | goto type_dispatch; |
3986 | } | |
2ca0d207 | 3987 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3988 | { |
3989 | operatorn: | |
f3d2630a | 3990 | #ifdef DEVAL |
42030fb2 DH |
3991 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3992 | ? SCM_ENTITY_PROCEDURE (proc) | |
3993 | : SCM_OPERATOR_PROCEDURE (proc), | |
3994 | scm_cons (proc, debug.info->a.args), | |
3995 | SCM_EOL)); | |
f3d2630a | 3996 | #else |
42030fb2 DH |
3997 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3998 | ? SCM_ENTITY_PROCEDURE (proc) | |
3999 | : SCM_OPERATOR_PROCEDURE (proc), | |
4000 | scm_cons2 (proc, arg1, | |
4001 | scm_cons (arg2, | |
4002 | scm_eval_args (x, | |
4003 | env, | |
4004 | proc))), | |
4005 | SCM_EOL)); | |
f3d2630a | 4006 | #endif |
42030fb2 | 4007 | } |
2ca0d207 DH |
4008 | else |
4009 | goto badfun; | |
42030fb2 | 4010 | case scm_tc7_subr_0: |
14b18ed6 | 4011 | case scm_tc7_dsubr: |
42030fb2 DH |
4012 | case scm_tc7_cxr: |
4013 | case scm_tc7_subr_1o: | |
4014 | case scm_tc7_subr_1: | |
4015 | case scm_tc7_subr_3: | |
ab1f1094 | 4016 | scm_wrong_num_args (proc); |
42030fb2 | 4017 | default: |
9b07e212 | 4018 | goto badfun; |
42030fb2 DH |
4019 | case scm_tc7_pws: |
4020 | proc = SCM_PROCEDURE (proc); | |
4021 | #ifdef DEVAL | |
4022 | debug.info->a.proc = proc; | |
4023 | #endif | |
4024 | if (!SCM_CLOSUREP (proc)) | |
4025 | goto evap2; | |
ddd8f927 | 4026 | /* fallthrough */ |
42030fb2 | 4027 | case scm_tcs_closures: |
ddd8f927 DH |
4028 | { |
4029 | /* clos2: */ | |
4030 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4031 | if (SCM_NULLP (formals) | |
4032 | || (SCM_CONSP (formals) | |
4033 | && (SCM_NULLP (SCM_CDR (formals)) | |
4034 | || (SCM_CONSP (SCM_CDR (formals)) | |
4035 | && SCM_CONSP (SCM_CDDR (formals)))))) | |
4036 | goto umwrongnumargs; | |
0c32d76c | 4037 | #ifdef DEVAL |
ddd8f927 DH |
4038 | env = SCM_EXTEND_ENV (formals, |
4039 | debug.info->a.args, | |
4040 | SCM_ENV (proc)); | |
195847fa | 4041 | #else |
ddd8f927 DH |
4042 | env = SCM_EXTEND_ENV (formals, |
4043 | scm_list_2 (arg1, arg2), | |
4044 | SCM_ENV (proc)); | |
195847fa | 4045 | #endif |
ddd8f927 DH |
4046 | x = SCM_CLOSURE_BODY (proc); |
4047 | goto nontoplevel_begin; | |
4048 | } | |
42030fb2 DH |
4049 | } |
4050 | } | |
42030fb2 | 4051 | if (!SCM_CONSP (x)) |
ab1f1094 | 4052 | scm_wrong_num_args (proc); |
42030fb2 DH |
4053 | #ifdef DEVAL |
4054 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4055 | deval_args (x, env, proc, | |
4056 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4057 | #endif | |
4058 | ENTER_APPLY; | |
4059 | evap3: | |
ddd8f927 | 4060 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4061 | switch (SCM_TYP7 (proc)) |
4062 | { /* have 3 or more arguments */ | |
4063 | #ifdef DEVAL | |
6dbd0af5 | 4064 | case scm_tc7_subr_3: |
ab1f1094 DH |
4065 | if (!SCM_NULLP (SCM_CDR (x))) |
4066 | scm_wrong_num_args (proc); | |
4067 | else | |
4068 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4069 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4070 | case scm_tc7_asubr: |
4071 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4072 | arg2 = SCM_CDDR (debug.info->a.args); | |
4073 | do | |
4074 | { | |
4075 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4076 | arg2 = SCM_CDR (arg2); | |
4077 | } | |
4078 | while (SCM_NIMP (arg2)); | |
4079 | RETURN (arg1); | |
4080 | case scm_tc7_rpsubr: | |
4081 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4082 | RETURN (SCM_BOOL_F); | |
4083 | arg1 = SCM_CDDR (debug.info->a.args); | |
4084 | do | |
4085 | { | |
4086 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) | |
4087 | RETURN (SCM_BOOL_F); | |
4088 | arg2 = SCM_CAR (arg1); | |
4089 | arg1 = SCM_CDR (arg1); | |
4090 | } | |
4091 | while (SCM_NIMP (arg1)); | |
4092 | RETURN (SCM_BOOL_T); | |
4093 | case scm_tc7_lsubr_2: | |
4094 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4095 | SCM_CDDR (debug.info->a.args))); | |
4096 | case scm_tc7_lsubr: | |
4097 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4098 | case scm_tc7_smob: | |
4099 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4100 | goto badfun; | |
4101 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4102 | SCM_CDDR (debug.info->a.args))); | |
4103 | case scm_tc7_cclo: | |
4104 | goto cclon; | |
002f1a5d MD |
4105 | case scm_tc7_pws: |
4106 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4107 | debug.info->a.proc = proc; |
002f1a5d | 4108 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4109 | goto evap3; |
ddd8f927 | 4110 | /* fallthrough */ |
6dbd0af5 | 4111 | case scm_tcs_closures: |
ddd8f927 DH |
4112 | { |
4113 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4114 | if (SCM_NULLP (formals) | |
4115 | || (SCM_CONSP (formals) | |
4116 | && (SCM_NULLP (SCM_CDR (formals)) | |
4117 | || (SCM_CONSP (SCM_CDR (formals)) | |
4118 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4119 | goto umwrongnumargs; | |
4120 | SCM_SET_ARGSREADY (debug); | |
4121 | env = SCM_EXTEND_ENV (formals, | |
4122 | debug.info->a.args, | |
4123 | SCM_ENV (proc)); | |
4124 | x = SCM_CLOSURE_BODY (proc); | |
4125 | goto nontoplevel_begin; | |
4126 | } | |
6dbd0af5 | 4127 | #else /* DEVAL */ |
42030fb2 | 4128 | case scm_tc7_subr_3: |
ab1f1094 DH |
4129 | if (!SCM_NULLP (SCM_CDR (x))) |
4130 | scm_wrong_num_args (proc); | |
4131 | else | |
4132 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4133 | case scm_tc7_asubr: |
4134 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4135 | do | |
4136 | { | |
4137 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4138 | x = SCM_CDR(x); | |
4139 | } | |
6bff1368 | 4140 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4141 | RETURN (arg1); |
4142 | case scm_tc7_rpsubr: | |
4143 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4144 | RETURN (SCM_BOOL_F); | |
4145 | do | |
4146 | { | |
4147 | arg1 = EVALCAR (x, env); | |
4148 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1))) | |
4149 | RETURN (SCM_BOOL_F); | |
4150 | arg2 = arg1; | |
4151 | x = SCM_CDR (x); | |
4152 | } | |
6bff1368 | 4153 | while (!SCM_NULLP (x)); |
42030fb2 DH |
4154 | RETURN (SCM_BOOL_T); |
4155 | case scm_tc7_lsubr_2: | |
4156 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4157 | case scm_tc7_lsubr: | |
4158 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4159 | arg2, | |
4160 | scm_eval_args (x, env, proc)))); | |
4161 | case scm_tc7_smob: | |
4162 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4163 | goto badfun; | |
4164 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4165 | scm_eval_args (x, env, proc))); | |
4166 | case scm_tc7_cclo: | |
4167 | goto cclon; | |
4168 | case scm_tc7_pws: | |
4169 | proc = SCM_PROCEDURE (proc); | |
4170 | if (!SCM_CLOSUREP (proc)) | |
4171 | goto evap3; | |
ddd8f927 DH |
4172 | /* fallthrough */ |
4173 | case scm_tcs_closures: | |
da7f71d7 | 4174 | { |
ddd8f927 | 4175 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
42030fb2 DH |
4176 | if (SCM_NULLP (formals) |
4177 | || (SCM_CONSP (formals) | |
4178 | && (SCM_NULLP (SCM_CDR (formals)) | |
4179 | || (SCM_CONSP (SCM_CDR (formals)) | |
4180 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4181 | goto umwrongnumargs; | |
ddd8f927 DH |
4182 | env = SCM_EXTEND_ENV (formals, |
4183 | scm_cons2 (arg1, | |
4184 | arg2, | |
4185 | scm_eval_args (x, env, proc)), | |
4186 | SCM_ENV (proc)); | |
4187 | x = SCM_CLOSURE_BODY (proc); | |
4188 | goto nontoplevel_begin; | |
da7f71d7 | 4189 | } |
0f2d19dd | 4190 | #endif /* DEVAL */ |
42030fb2 DH |
4191 | case scm_tcs_struct: |
4192 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4193 | { | |
f3d2630a | 4194 | #ifdef DEVAL |
42030fb2 | 4195 | arg1 = debug.info->a.args; |
f3d2630a | 4196 | #else |
42030fb2 | 4197 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4198 | #endif |
42030fb2 DH |
4199 | x = SCM_ENTITY_PROCEDURE (proc); |
4200 | goto type_dispatch; | |
4201 | } | |
2ca0d207 | 4202 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4203 | goto operatorn; |
2ca0d207 DH |
4204 | else |
4205 | goto badfun; | |
42030fb2 DH |
4206 | case scm_tc7_subr_2: |
4207 | case scm_tc7_subr_1o: | |
4208 | case scm_tc7_subr_2o: | |
4209 | case scm_tc7_subr_0: | |
14b18ed6 | 4210 | case scm_tc7_dsubr: |
42030fb2 DH |
4211 | case scm_tc7_cxr: |
4212 | case scm_tc7_subr_1: | |
ab1f1094 | 4213 | scm_wrong_num_args (proc); |
42030fb2 | 4214 | default: |
9b07e212 | 4215 | goto badfun; |
42030fb2 DH |
4216 | } |
4217 | } | |
0f2d19dd JB |
4218 | } |
4219 | #ifdef DEVAL | |
6dbd0af5 | 4220 | exit: |
5132eef0 | 4221 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4222 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4223 | { |
b7ff98dd MD |
4224 | SCM_CLEAR_TRACED_FRAME (debug); |
4225 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4226 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4227 | else |
4228 | { | |
5f144b10 GH |
4229 | int first; |
4230 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4231 | |
5f144b10 | 4232 | if (first) |
dff98306 | 4233 | arg1 = val; |
5f144b10 | 4234 | else |
6dbd0af5 | 4235 | { |
5f144b10 | 4236 | proc = val; |
6dbd0af5 MD |
4237 | goto ret; |
4238 | } | |
4239 | } | |
d95c0b76 | 4240 | SCM_TRAPS_P = 0; |
dff98306 | 4241 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4242 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4243 | } |
4244 | ret: | |
1646d37b | 4245 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4246 | return proc; |
4247 | #endif | |
4248 | } | |
4249 | ||
6dbd0af5 MD |
4250 | |
4251 | /* SECTION: This code is compiled once. | |
4252 | */ | |
4253 | ||
0f2d19dd JB |
4254 | #ifndef DEVAL |
4255 | ||
fdc28395 | 4256 | \f |
d0b07b5d | 4257 | |
fdc28395 KN |
4258 | /* Simple procedure calls |
4259 | */ | |
4260 | ||
4261 | SCM | |
4262 | scm_call_0 (SCM proc) | |
4263 | { | |
4264 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4265 | } | |
4266 | ||
4267 | SCM | |
4268 | scm_call_1 (SCM proc, SCM arg1) | |
4269 | { | |
4270 | return scm_apply (proc, arg1, scm_listofnull); | |
4271 | } | |
4272 | ||
4273 | SCM | |
4274 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4275 | { | |
4276 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4277 | } | |
4278 | ||
4279 | SCM | |
4280 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4281 | { | |
4282 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4283 | } | |
4284 | ||
d95c0b76 NJ |
4285 | SCM |
4286 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4287 | { | |
4288 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4289 | scm_cons (arg4, scm_listofnull))); | |
4290 | } | |
4291 | ||
fdc28395 KN |
4292 | /* Simple procedure applies |
4293 | */ | |
4294 | ||
4295 | SCM | |
4296 | scm_apply_0 (SCM proc, SCM args) | |
4297 | { | |
4298 | return scm_apply (proc, args, SCM_EOL); | |
4299 | } | |
4300 | ||
4301 | SCM | |
4302 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4303 | { | |
4304 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4305 | } | |
4306 | ||
4307 | SCM | |
4308 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4309 | { | |
4310 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4311 | } | |
4312 | ||
4313 | SCM | |
4314 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4315 | { | |
4316 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4317 | SCM_EOL); | |
4318 | } | |
4319 | ||
82a2622a | 4320 | /* This code processes the arguments to apply: |
b145c172 JB |
4321 | |
4322 | (apply PROC ARG1 ... ARGS) | |
4323 | ||
82a2622a JB |
4324 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4325 | ... arguments onto the front of ARGS, and returns the resulting | |
4326 | list. Note that ARGS is a list; thus, the argument to this | |
4327 | function is a list whose last element is a list. | |
4328 | ||
4329 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4330 | result. apply:nconc2last takes care of building the list of |
4331 | arguments, given (ARG1 ... ARGS). | |
4332 | ||
82a2622a JB |
4333 | Rather than do new consing, apply:nconc2last destroys its argument. |
4334 | On that topic, this code came into my care with the following | |
4335 | beautifully cryptic comment on that topic: "This will only screw | |
4336 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4337 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4338 | |
3b3b36dd | 4339 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4340 | (SCM lst), |
4341 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4342 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4343 | "@var{args}, and returns the resulting list. Note that\n" | |
4344 | "@var{args} is a list; thus, the argument to this function is\n" | |
4345 | "a list whose last element is a list.\n" | |
4346 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4347 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4348 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4349 | { |
4350 | SCM *lloc; | |
34d19ef6 | 4351 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4352 | lloc = &lst; |
c96d76b8 NJ |
4353 | while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be |
4354 | SCM_NULL_OR_NIL_P, but not | |
4355 | needed in 99.99% of cases, | |
4356 | and it could seriously hurt | |
4357 | performance. - Neil */ | |
a23afe53 | 4358 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4359 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4360 | *lloc = SCM_CAR (*lloc); |
4361 | return lst; | |
4362 | } | |
1bbd0b84 | 4363 | #undef FUNC_NAME |
0f2d19dd JB |
4364 | |
4365 | #endif /* !DEVAL */ | |
4366 | ||
6dbd0af5 MD |
4367 | |
4368 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4369 | * It is compiled twice. | |
4370 | */ | |
4371 | ||
0f2d19dd | 4372 | #if 0 |
0f2d19dd | 4373 | SCM |
6e8d25a6 | 4374 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4375 | {} |
4376 | #endif | |
4377 | ||
4378 | #if 0 | |
0f2d19dd | 4379 | SCM |
6e8d25a6 | 4380 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4381 | {} |
0f2d19dd JB |
4382 | #endif |
4383 | ||
1cc91f1b | 4384 | |
82a2622a JB |
4385 | /* Apply a function to a list of arguments. |
4386 | ||
4387 | This function is exported to the Scheme level as taking two | |
4388 | required arguments and a tail argument, as if it were: | |
4389 | (lambda (proc arg1 . args) ...) | |
4390 | Thus, if you just have a list of arguments to pass to a procedure, | |
4391 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4392 | args, pass the first as ARG1, then cons any remaining fixed args | |
4393 | onto the front of your argument list, and pass that as ARGS. */ | |
4394 | ||
0f2d19dd | 4395 | SCM |
1bbd0b84 | 4396 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4397 | { |
0f2d19dd | 4398 | #ifdef DEVAL |
92c2555f MV |
4399 | scm_t_debug_frame debug; |
4400 | scm_t_debug_info debug_vect_body; | |
1646d37b | 4401 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 4402 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4403 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4404 | debug.vect[0].a.proc = proc; |
4405 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 4406 | scm_last_debug_frame = &debug; |
0f2d19dd | 4407 | #else |
b7ff98dd | 4408 | if (SCM_DEBUGGINGP) |
0f2d19dd | 4409 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4410 | #endif |
4411 | ||
4412 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4413 | |
4414 | /* If ARGS is the empty list, then we're calling apply with only two | |
4415 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4416 | the case, futz with things so that ARG1 is the first argument to | |
4417 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4418 | rest. |
4419 | ||
4420 | Setting the debug apply frame args this way is pretty messy. | |
4421 | Perhaps we should store arg1 and args directly in the frame as | |
4422 | received, and let scm_frame_arguments unpack them, because that's | |
4423 | a relatively rare operation. This works for now; if the Guile | |
4424 | developer archives are still around, see Mikael's post of | |
4425 | 11-Apr-97. */ | |
0f2d19dd JB |
4426 | if (SCM_NULLP (args)) |
4427 | { | |
4428 | if (SCM_NULLP (arg1)) | |
30000774 JB |
4429 | { |
4430 | arg1 = SCM_UNDEFINED; | |
4431 | #ifdef DEVAL | |
4432 | debug.vect[0].a.args = SCM_EOL; | |
4433 | #endif | |
4434 | } | |
0f2d19dd JB |
4435 | else |
4436 | { | |
30000774 JB |
4437 | #ifdef DEVAL |
4438 | debug.vect[0].a.args = arg1; | |
4439 | #endif | |
0f2d19dd JB |
4440 | args = SCM_CDR (arg1); |
4441 | arg1 = SCM_CAR (arg1); | |
4442 | } | |
4443 | } | |
4444 | else | |
4445 | { | |
0f2d19dd | 4446 | args = scm_nconc2last (args); |
30000774 JB |
4447 | #ifdef DEVAL |
4448 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4449 | #endif | |
0f2d19dd | 4450 | } |
0f2d19dd | 4451 | #ifdef DEVAL |
b6d75948 | 4452 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4453 | { |
4454 | SCM tmp; | |
b7ff98dd | 4455 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4456 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4457 | else |
4458 | { | |
5f144b10 GH |
4459 | int first; |
4460 | ||
4461 | tmp = scm_make_continuation (&first); | |
4462 | if (!first) | |
6dbd0af5 MD |
4463 | goto entap; |
4464 | } | |
d95c0b76 NJ |
4465 | SCM_TRAPS_P = 0; |
4466 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4467 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4468 | } |
4469 | entap: | |
4470 | ENTER_APPLY; | |
4471 | #endif | |
6dbd0af5 | 4472 | tail: |
0f2d19dd JB |
4473 | switch (SCM_TYP7 (proc)) |
4474 | { | |
4475 | case scm_tc7_subr_2o: | |
4476 | args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args); | |
ddea3325 | 4477 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4478 | case scm_tc7_subr_2: |
ab1f1094 DH |
4479 | if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args))) |
4480 | scm_wrong_num_args (proc); | |
0f2d19dd | 4481 | args = SCM_CAR (args); |
ddea3325 | 4482 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4483 | case scm_tc7_subr_0: |
ab1f1094 DH |
4484 | if (!SCM_UNBNDP (arg1)) |
4485 | scm_wrong_num_args (proc); | |
4486 | else | |
4487 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4488 | case scm_tc7_subr_1: |
ab1f1094 DH |
4489 | if (SCM_UNBNDP (arg1)) |
4490 | scm_wrong_num_args (proc); | |
0f2d19dd | 4491 | case scm_tc7_subr_1o: |
ab1f1094 DH |
4492 | if (!SCM_NULLP (args)) |
4493 | scm_wrong_num_args (proc); | |
4494 | else | |
4495 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
4496 | case scm_tc7_dsubr: |
4497 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) | |
4498 | scm_wrong_num_args (proc); | |
4499 | if (SCM_INUMP (arg1)) | |
4500 | { | |
4501 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4502 | } | |
4503 | else if (SCM_REALP (arg1)) | |
4504 | { | |
4505 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4506 | } | |
4507 | else if (SCM_BIGP (arg1)) | |
f92e85f7 MV |
4508 | { |
4509 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4510 | } | |
4511 | else if (SCM_FRACTIONP (arg1)) | |
4512 | { | |
4513 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4514 | } | |
14b18ed6 DH |
4515 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4516 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
0f2d19dd | 4517 | case scm_tc7_cxr: |
ab1f1094 DH |
4518 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) |
4519 | scm_wrong_num_args (proc); | |
0f2d19dd | 4520 | { |
14b18ed6 DH |
4521 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4522 | do | |
4523 | { | |
4524 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4525 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4526 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4527 | pattern >>= 2; | |
4528 | } while (pattern); | |
4529 | RETURN (arg1); | |
0f2d19dd JB |
4530 | } |
4531 | case scm_tc7_subr_3: | |
ab1f1094 DH |
4532 | if (SCM_NULLP (args) |
4533 | || SCM_NULLP (SCM_CDR (args)) | |
4534 | || !SCM_NULLP (SCM_CDDR (args))) | |
4535 | scm_wrong_num_args (proc); | |
4536 | else | |
4537 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4538 | case scm_tc7_lsubr: |
4539 | #ifdef DEVAL | |
ddea3325 | 4540 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4541 | #else |
ddea3325 | 4542 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4543 | #endif |
4544 | case scm_tc7_lsubr_2: | |
ab1f1094 DH |
4545 | if (!SCM_CONSP (args)) |
4546 | scm_wrong_num_args (proc); | |
4547 | else | |
4548 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd JB |
4549 | case scm_tc7_asubr: |
4550 | if (SCM_NULLP (args)) | |
ddea3325 | 4551 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4552 | while (SCM_NIMP (args)) |
4553 | { | |
4554 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4555 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); | |
4556 | args = SCM_CDR (args); | |
4557 | } | |
4558 | RETURN (arg1); | |
4559 | case scm_tc7_rpsubr: | |
4560 | if (SCM_NULLP (args)) | |
4561 | RETURN (SCM_BOOL_T); | |
4562 | while (SCM_NIMP (args)) | |
4563 | { | |
4564 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4565 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) | |
4566 | RETURN (SCM_BOOL_F); | |
4567 | arg1 = SCM_CAR (args); | |
4568 | args = SCM_CDR (args); | |
4569 | } | |
4570 | RETURN (SCM_BOOL_T); | |
4571 | case scm_tcs_closures: | |
4572 | #ifdef DEVAL | |
6dbd0af5 | 4573 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4574 | #else |
4575 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4576 | #endif | |
726d810a | 4577 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4578 | scm_wrong_num_args (proc); |
1609038c MD |
4579 | |
4580 | /* Copy argument list */ | |
4581 | if (SCM_IMP (arg1)) | |
4582 | args = arg1; | |
4583 | else | |
4584 | { | |
4585 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
05b15362 | 4586 | for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4587 | { |
05b15362 | 4588 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4589 | tl = SCM_CDR (tl); |
4590 | } | |
4591 | SCM_SETCDR (tl, arg1); | |
4592 | } | |
4593 | ||
821f18a4 DH |
4594 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4595 | args, | |
4596 | SCM_ENV (proc)); | |
f9450cdb | 4597 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4598 | again: |
05b15362 DH |
4599 | arg1 = SCM_CDR (proc); |
4600 | while (!SCM_NULLP (arg1)) | |
2ddb0920 MD |
4601 | { |
4602 | if (SCM_IMP (SCM_CAR (proc))) | |
4603 | { | |
4604 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4605 | { | |
28d52ebb | 4606 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4607 | /* check for race condition */ |
4608 | if (SCM_ISYMP (SCM_CAR (proc))) | |
9d4bf6d3 | 4609 | m_expand_body (proc, args); |
28d52ebb | 4610 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4611 | goto again; |
2ddb0920 | 4612 | } |
5280aaca | 4613 | else |
17fa3fcf | 4614 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4615 | } |
4616 | else | |
e791c18f MD |
4617 | SCM_CEVAL (SCM_CAR (proc), args); |
4618 | proc = arg1; | |
05b15362 | 4619 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4620 | } |
e791c18f | 4621 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4622 | case scm_tc7_smob: |
68b06924 | 4623 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4624 | goto badproc; |
afa38f6e | 4625 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4626 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
afa38f6e | 4627 | else if (SCM_NULLP (args)) |
ddea3325 | 4628 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
0717dfd8 | 4629 | else if (SCM_NULLP (SCM_CDR (args))) |
ddea3325 | 4630 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4631 | else |
68b06924 | 4632 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4633 | case scm_tc7_cclo: |
4634 | #ifdef DEVAL | |
6dbd0af5 MD |
4635 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4636 | arg1 = proc; | |
4637 | proc = SCM_CCLO_SUBR (proc); | |
4638 | debug.vect[0].a.proc = proc; | |
4639 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4640 | #else |
4641 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4642 | arg1 = proc; |
4643 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4644 | #endif |
0f2d19dd | 4645 | goto tail; |
89efbff4 MD |
4646 | case scm_tc7_pws: |
4647 | proc = SCM_PROCEDURE (proc); | |
4648 | #ifdef DEVAL | |
4649 | debug.vect[0].a.proc = proc; | |
4650 | #endif | |
4651 | goto tail; | |
904a077d | 4652 | case scm_tcs_struct: |
f3d2630a MD |
4653 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4654 | { | |
4655 | #ifdef DEVAL | |
4656 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4657 | #else | |
4658 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4659 | #endif | |
195847fa | 4660 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4661 | } |
2ca0d207 | 4662 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4663 | { |
504d99c5 | 4664 | /* operator */ |
da7f71d7 MD |
4665 | #ifdef DEVAL |
4666 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4667 | #else | |
4668 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4669 | #endif | |
4670 | arg1 = proc; | |
195847fa MD |
4671 | proc = (SCM_I_ENTITYP (proc) |
4672 | ? SCM_ENTITY_PROCEDURE (proc) | |
4673 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4674 | #ifdef DEVAL |
4675 | debug.vect[0].a.proc = proc; | |
4676 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4677 | #endif | |
195847fa MD |
4678 | if (SCM_NIMP (proc)) |
4679 | goto tail; | |
4680 | else | |
4681 | goto badproc; | |
da7f71d7 | 4682 | } |
2ca0d207 DH |
4683 | else |
4684 | goto badproc; | |
0f2d19dd JB |
4685 | default: |
4686 | badproc: | |
db4b4ca6 | 4687 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
4688 | } |
4689 | #ifdef DEVAL | |
6dbd0af5 | 4690 | exit: |
5132eef0 | 4691 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4692 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4693 | { |
b7ff98dd MD |
4694 | SCM_CLEAR_TRACED_FRAME (debug); |
4695 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 4696 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4697 | else |
4698 | { | |
5f144b10 GH |
4699 | int first; |
4700 | SCM val = scm_make_continuation (&first); | |
4701 | ||
4702 | if (first) | |
4703 | arg1 = val; | |
4704 | else | |
6dbd0af5 | 4705 | { |
5f144b10 | 4706 | proc = val; |
6dbd0af5 MD |
4707 | goto ret; |
4708 | } | |
4709 | } | |
d95c0b76 NJ |
4710 | SCM_TRAPS_P = 0; |
4711 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
4712 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4713 | } |
4714 | ret: | |
1646d37b | 4715 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4716 | return proc; |
4717 | #endif | |
4718 | } | |
4719 | ||
6dbd0af5 MD |
4720 | |
4721 | /* SECTION: The rest of this file is only read once. | |
4722 | */ | |
4723 | ||
0f2d19dd JB |
4724 | #ifndef DEVAL |
4725 | ||
504d99c5 MD |
4726 | /* Trampolines |
4727 | * | |
4728 | * Trampolines make it possible to move procedure application dispatch | |
4729 | * outside inner loops. The motivation was clean implementation of | |
4730 | * efficient replacements of R5RS primitives in SRFI-1. | |
4731 | * | |
4732 | * The semantics is clear: scm_trampoline_N returns an optimized | |
4733 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
4734 | * on N args). | |
4735 | * | |
4736 | * Applying the optimization to map and for-each increased efficiency | |
4737 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
4738 | * before. | |
4739 | */ | |
4740 | ||
756414cf MD |
4741 | static SCM |
4742 | call_subr0_0 (SCM proc) | |
4743 | { | |
4744 | return SCM_SUBRF (proc) (); | |
4745 | } | |
4746 | ||
4747 | static SCM | |
4748 | call_subr1o_0 (SCM proc) | |
4749 | { | |
4750 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
4751 | } | |
4752 | ||
4753 | static SCM | |
4754 | call_lsubr_0 (SCM proc) | |
4755 | { | |
4756 | return SCM_SUBRF (proc) (SCM_EOL); | |
4757 | } | |
4758 | ||
4759 | SCM | |
4760 | scm_i_call_closure_0 (SCM proc) | |
4761 | { | |
6a3f13f0 DH |
4762 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4763 | SCM_EOL, | |
4764 | SCM_ENV (proc)); | |
4765 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4766 | return result; |
756414cf MD |
4767 | } |
4768 | ||
4769 | scm_t_trampoline_0 | |
4770 | scm_trampoline_0 (SCM proc) | |
4771 | { | |
2510c810 DH |
4772 | scm_t_trampoline_0 trampoline; |
4773 | ||
756414cf | 4774 | if (SCM_IMP (proc)) |
d0b07b5d | 4775 | return NULL; |
2510c810 | 4776 | |
756414cf MD |
4777 | switch (SCM_TYP7 (proc)) |
4778 | { | |
4779 | case scm_tc7_subr_0: | |
2510c810 DH |
4780 | trampoline = call_subr0_0; |
4781 | break; | |
756414cf | 4782 | case scm_tc7_subr_1o: |
2510c810 DH |
4783 | trampoline = call_subr1o_0; |
4784 | break; | |
756414cf | 4785 | case scm_tc7_lsubr: |
2510c810 DH |
4786 | trampoline = call_lsubr_0; |
4787 | break; | |
756414cf MD |
4788 | case scm_tcs_closures: |
4789 | { | |
4790 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b | 4791 | if (SCM_NULLP (formals) || !SCM_CONSP (formals)) |
2510c810 | 4792 | trampoline = scm_i_call_closure_0; |
756414cf | 4793 | else |
d0b07b5d | 4794 | return NULL; |
2510c810 | 4795 | break; |
756414cf MD |
4796 | } |
4797 | case scm_tcs_struct: | |
4798 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4799 | trampoline = scm_call_generic_0; |
2ca0d207 | 4800 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4801 | trampoline = scm_call_0; |
4802 | else | |
4803 | return NULL; | |
4804 | break; | |
756414cf MD |
4805 | case scm_tc7_smob: |
4806 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4807 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 4808 | else |
d0b07b5d | 4809 | return NULL; |
2510c810 | 4810 | break; |
756414cf MD |
4811 | case scm_tc7_asubr: |
4812 | case scm_tc7_rpsubr: | |
4813 | case scm_tc7_cclo: | |
4814 | case scm_tc7_pws: | |
2510c810 DH |
4815 | trampoline = scm_call_0; |
4816 | break; | |
756414cf | 4817 | default: |
2510c810 | 4818 | return NULL; /* not applicable on zero arguments */ |
756414cf | 4819 | } |
2510c810 DH |
4820 | /* We only reach this point if a valid trampoline was determined. */ |
4821 | ||
4822 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4823 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
4824 | if (SCM_DEBUGGINGP) | |
4825 | return scm_call_0; | |
4826 | else | |
4827 | return trampoline; | |
756414cf MD |
4828 | } |
4829 | ||
504d99c5 MD |
4830 | static SCM |
4831 | call_subr1_1 (SCM proc, SCM arg1) | |
4832 | { | |
4833 | return SCM_SUBRF (proc) (arg1); | |
4834 | } | |
4835 | ||
9ed24633 MD |
4836 | static SCM |
4837 | call_subr2o_1 (SCM proc, SCM arg1) | |
4838 | { | |
4839 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
4840 | } | |
4841 | ||
504d99c5 MD |
4842 | static SCM |
4843 | call_lsubr_1 (SCM proc, SCM arg1) | |
4844 | { | |
4845 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
4846 | } | |
4847 | ||
4848 | static SCM | |
4849 | call_dsubr_1 (SCM proc, SCM arg1) | |
4850 | { | |
4851 | if (SCM_INUMP (arg1)) | |
4852 | { | |
4853 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4854 | } | |
4855 | else if (SCM_REALP (arg1)) | |
4856 | { | |
4857 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4858 | } | |
504d99c5 | 4859 | else if (SCM_BIGP (arg1)) |
f92e85f7 MV |
4860 | { |
4861 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4862 | } | |
4863 | else if (SCM_FRACTIONP (arg1)) | |
4864 | { | |
4865 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1)))); | |
4866 | } | |
504d99c5 MD |
4867 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4868 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4869 | } | |
4870 | ||
4871 | static SCM | |
4872 | call_cxr_1 (SCM proc, SCM arg1) | |
4873 | { | |
14b18ed6 DH |
4874 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4875 | do | |
4876 | { | |
4877 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4878 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4879 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4880 | pattern >>= 2; | |
4881 | } while (pattern); | |
4882 | return arg1; | |
504d99c5 MD |
4883 | } |
4884 | ||
4885 | static SCM | |
4886 | call_closure_1 (SCM proc, SCM arg1) | |
4887 | { | |
6a3f13f0 DH |
4888 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4889 | scm_list_1 (arg1), | |
4890 | SCM_ENV (proc)); | |
4891 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4892 | return result; |
504d99c5 MD |
4893 | } |
4894 | ||
4895 | scm_t_trampoline_1 | |
4896 | scm_trampoline_1 (SCM proc) | |
4897 | { | |
2510c810 DH |
4898 | scm_t_trampoline_1 trampoline; |
4899 | ||
504d99c5 | 4900 | if (SCM_IMP (proc)) |
d0b07b5d | 4901 | return NULL; |
2510c810 | 4902 | |
504d99c5 MD |
4903 | switch (SCM_TYP7 (proc)) |
4904 | { | |
4905 | case scm_tc7_subr_1: | |
4906 | case scm_tc7_subr_1o: | |
2510c810 DH |
4907 | trampoline = call_subr1_1; |
4908 | break; | |
9ed24633 | 4909 | case scm_tc7_subr_2o: |
2510c810 DH |
4910 | trampoline = call_subr2o_1; |
4911 | break; | |
504d99c5 | 4912 | case scm_tc7_lsubr: |
2510c810 DH |
4913 | trampoline = call_lsubr_1; |
4914 | break; | |
14b18ed6 | 4915 | case scm_tc7_dsubr: |
2510c810 DH |
4916 | trampoline = call_dsubr_1; |
4917 | break; | |
504d99c5 | 4918 | case scm_tc7_cxr: |
2510c810 DH |
4919 | trampoline = call_cxr_1; |
4920 | break; | |
504d99c5 MD |
4921 | case scm_tcs_closures: |
4922 | { | |
4923 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4924 | if (!SCM_NULLP (formals) |
4925 | && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals)))) | |
2510c810 | 4926 | trampoline = call_closure_1; |
504d99c5 | 4927 | else |
d0b07b5d | 4928 | return NULL; |
2510c810 | 4929 | break; |
504d99c5 MD |
4930 | } |
4931 | case scm_tcs_struct: | |
4932 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4933 | trampoline = scm_call_generic_1; |
2ca0d207 | 4934 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4935 | trampoline = scm_call_1; |
4936 | else | |
4937 | return NULL; | |
4938 | break; | |
504d99c5 MD |
4939 | case scm_tc7_smob: |
4940 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4941 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 4942 | else |
d0b07b5d | 4943 | return NULL; |
2510c810 | 4944 | break; |
504d99c5 MD |
4945 | case scm_tc7_asubr: |
4946 | case scm_tc7_rpsubr: | |
4947 | case scm_tc7_cclo: | |
4948 | case scm_tc7_pws: | |
2510c810 DH |
4949 | trampoline = scm_call_1; |
4950 | break; | |
504d99c5 | 4951 | default: |
d0b07b5d | 4952 | return NULL; /* not applicable on one arg */ |
504d99c5 | 4953 | } |
2510c810 DH |
4954 | /* We only reach this point if a valid trampoline was determined. */ |
4955 | ||
4956 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4957 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
4958 | if (SCM_DEBUGGINGP) | |
4959 | return scm_call_1; | |
4960 | else | |
4961 | return trampoline; | |
504d99c5 MD |
4962 | } |
4963 | ||
4964 | static SCM | |
4965 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4966 | { | |
4967 | return SCM_SUBRF (proc) (arg1, arg2); | |
4968 | } | |
4969 | ||
9ed24633 MD |
4970 | static SCM |
4971 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4972 | { | |
4973 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
4974 | } | |
4975 | ||
504d99c5 MD |
4976 | static SCM |
4977 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
4978 | { | |
4979 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
4980 | } | |
4981 | ||
4982 | static SCM | |
4983 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
4984 | { | |
6a3f13f0 DH |
4985 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4986 | scm_list_2 (arg1, arg2), | |
4987 | SCM_ENV (proc)); | |
4988 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4989 | return result; |
504d99c5 MD |
4990 | } |
4991 | ||
4992 | scm_t_trampoline_2 | |
4993 | scm_trampoline_2 (SCM proc) | |
4994 | { | |
2510c810 DH |
4995 | scm_t_trampoline_2 trampoline; |
4996 | ||
504d99c5 | 4997 | if (SCM_IMP (proc)) |
d0b07b5d | 4998 | return NULL; |
2510c810 | 4999 | |
504d99c5 MD |
5000 | switch (SCM_TYP7 (proc)) |
5001 | { | |
5002 | case scm_tc7_subr_2: | |
5003 | case scm_tc7_subr_2o: | |
5004 | case scm_tc7_rpsubr: | |
5005 | case scm_tc7_asubr: | |
2510c810 DH |
5006 | trampoline = call_subr2_2; |
5007 | break; | |
9ed24633 | 5008 | case scm_tc7_lsubr_2: |
2510c810 DH |
5009 | trampoline = call_lsubr2_2; |
5010 | break; | |
504d99c5 | 5011 | case scm_tc7_lsubr: |
2510c810 DH |
5012 | trampoline = call_lsubr_2; |
5013 | break; | |
504d99c5 MD |
5014 | case scm_tcs_closures: |
5015 | { | |
5016 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
5017 | if (!SCM_NULLP (formals) |
5018 | && (!SCM_CONSP (formals) | |
5019 | || (!SCM_NULLP (SCM_CDR (formals)) | |
5020 | && (!SCM_CONSP (SCM_CDR (formals)) | |
5021 | || !SCM_CONSP (SCM_CDDR (formals)))))) | |
2510c810 | 5022 | trampoline = call_closure_2; |
504d99c5 | 5023 | else |
d0b07b5d | 5024 | return NULL; |
2510c810 | 5025 | break; |
504d99c5 MD |
5026 | } |
5027 | case scm_tcs_struct: | |
5028 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5029 | trampoline = scm_call_generic_2; |
2ca0d207 | 5030 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5031 | trampoline = scm_call_2; |
5032 | else | |
5033 | return NULL; | |
5034 | break; | |
504d99c5 MD |
5035 | case scm_tc7_smob: |
5036 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5037 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5038 | else |
d0b07b5d | 5039 | return NULL; |
2510c810 | 5040 | break; |
504d99c5 MD |
5041 | case scm_tc7_cclo: |
5042 | case scm_tc7_pws: | |
2510c810 DH |
5043 | trampoline = scm_call_2; |
5044 | break; | |
504d99c5 | 5045 | default: |
d0b07b5d | 5046 | return NULL; /* not applicable on two args */ |
504d99c5 | 5047 | } |
2510c810 DH |
5048 | /* We only reach this point if a valid trampoline was determined. */ |
5049 | ||
5050 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5051 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
5052 | if (SCM_DEBUGGINGP) | |
5053 | return scm_call_2; | |
5054 | else | |
5055 | return trampoline; | |
504d99c5 MD |
5056 | } |
5057 | ||
d9c393f5 JB |
5058 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5059 | ||
47c3f06d | 5060 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5061 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5062 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5063 | static inline void |
47c3f06d | 5064 | check_map_args (SCM argv, |
c014a02e | 5065 | long len, |
47c3f06d MD |
5066 | SCM gf, |
5067 | SCM proc, | |
5068 | SCM args, | |
5069 | const char *who) | |
d9c393f5 | 5070 | { |
34d19ef6 | 5071 | SCM const *ve = SCM_VELTS (argv); |
c014a02e | 5072 | long i; |
d9c393f5 | 5073 | |
b5c2579a | 5074 | for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5075 | { |
c014a02e | 5076 | long elt_len = scm_ilength (ve[i]); |
d9c393f5 JB |
5077 | |
5078 | if (elt_len < 0) | |
47c3f06d MD |
5079 | { |
5080 | if (gf) | |
5081 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5082 | else | |
5083 | scm_wrong_type_arg (who, i + 2, ve[i]); | |
5084 | } | |
d9c393f5 JB |
5085 | |
5086 | if (elt_len != len) | |
504d99c5 | 5087 | scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2)); |
d9c393f5 JB |
5088 | } |
5089 | ||
5d2b97cd | 5090 | scm_remember_upto_here_1 (argv); |
d9c393f5 JB |
5091 | } |
5092 | ||
5093 | ||
47c3f06d | 5094 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5095 | |
368bf056 MD |
5096 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5097 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5098 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5099 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5100 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5101 | */ |
5102 | ||
0f2d19dd | 5103 | SCM |
1bbd0b84 | 5104 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5105 | #define FUNC_NAME s_map |
0f2d19dd | 5106 | { |
c014a02e | 5107 | long i, len; |
0f2d19dd JB |
5108 | SCM res = SCM_EOL; |
5109 | SCM *pres = &res; | |
34d19ef6 | 5110 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
0f2d19dd | 5111 | |
d9c393f5 | 5112 | len = scm_ilength (arg1); |
47c3f06d MD |
5113 | SCM_GASSERTn (len >= 0, |
5114 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5115 | SCM_VALIDATE_REST_ARGUMENT (args); |
0f2d19dd JB |
5116 | if (SCM_NULLP (args)) |
5117 | { | |
504d99c5 MD |
5118 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5119 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5120 | while (SCM_NIMP (arg1)) | |
5121 | { | |
5122 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5123 | pres = SCM_CDRLOC (*pres); | |
5124 | arg1 = SCM_CDR (arg1); | |
5125 | } | |
5126 | return res; | |
5127 | } | |
5128 | if (SCM_NULLP (SCM_CDR (args))) | |
5129 | { | |
5130 | SCM arg2 = SCM_CAR (args); | |
5131 | int len2 = scm_ilength (arg2); | |
5132 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5133 | SCM_GASSERTn (call, | |
5134 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5135 | SCM_GASSERTn (len2 >= 0, | |
5136 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5137 | if (len2 != len) | |
5138 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5139 | while (SCM_NIMP (arg1)) |
5140 | { | |
504d99c5 | 5141 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5142 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5143 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5144 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5145 | } |
5146 | return res; | |
5147 | } | |
05b15362 DH |
5148 | arg1 = scm_cons (arg1, args); |
5149 | args = scm_vector (arg1); | |
0f2d19dd | 5150 | ve = SCM_VELTS (args); |
47c3f06d | 5151 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5152 | while (1) |
5153 | { | |
5154 | arg1 = SCM_EOL; | |
b5c2579a | 5155 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5156 | { |
d9c393f5 JB |
5157 | if (SCM_IMP (ve[i])) |
5158 | return res; | |
0f2d19dd | 5159 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5160 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd | 5161 | } |
8ea46249 | 5162 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5163 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5164 | } |
5165 | } | |
af45e3b0 | 5166 | #undef FUNC_NAME |
0f2d19dd JB |
5167 | |
5168 | ||
47c3f06d | 5169 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5170 | |
0f2d19dd | 5171 | SCM |
1bbd0b84 | 5172 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5173 | #define FUNC_NAME s_for_each |
0f2d19dd | 5174 | { |
34d19ef6 | 5175 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
c014a02e | 5176 | long i, len; |
d9c393f5 | 5177 | len = scm_ilength (arg1); |
47c3f06d MD |
5178 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5179 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5180 | SCM_VALIDATE_REST_ARGUMENT (args); |
c96d76b8 | 5181 | if (SCM_NULLP (args)) |
0f2d19dd | 5182 | { |
504d99c5 MD |
5183 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5184 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5185 | while (SCM_NIMP (arg1)) | |
5186 | { | |
5187 | call (proc, SCM_CAR (arg1)); | |
5188 | arg1 = SCM_CDR (arg1); | |
5189 | } | |
5190 | return SCM_UNSPECIFIED; | |
5191 | } | |
5192 | if (SCM_NULLP (SCM_CDR (args))) | |
5193 | { | |
5194 | SCM arg2 = SCM_CAR (args); | |
5195 | int len2 = scm_ilength (arg2); | |
5196 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5197 | SCM_GASSERTn (call, g_for_each, | |
5198 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5199 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5200 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5201 | if (len2 != len) | |
5202 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5203 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5204 | { |
504d99c5 | 5205 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5206 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5207 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5208 | } |
5209 | return SCM_UNSPECIFIED; | |
5210 | } | |
05b15362 DH |
5211 | arg1 = scm_cons (arg1, args); |
5212 | args = scm_vector (arg1); | |
0f2d19dd | 5213 | ve = SCM_VELTS (args); |
47c3f06d | 5214 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5215 | while (1) |
5216 | { | |
5217 | arg1 = SCM_EOL; | |
b5c2579a | 5218 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5219 | { |
c96d76b8 NJ |
5220 | if (SCM_IMP (ve[i])) |
5221 | return SCM_UNSPECIFIED; | |
0f2d19dd | 5222 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5223 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd JB |
5224 | } |
5225 | scm_apply (proc, arg1, SCM_EOL); | |
5226 | } | |
5227 | } | |
af45e3b0 | 5228 | #undef FUNC_NAME |
0f2d19dd | 5229 | |
1cc91f1b | 5230 | |
0f2d19dd | 5231 | SCM |
6e8d25a6 | 5232 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5233 | { |
16d4699b MV |
5234 | SCM z; |
5235 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5236 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5237 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5238 | return z; |
5239 | } | |
5240 | ||
5241 | ||
92c2555f | 5242 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5243 | |
0f2d19dd | 5244 | SCM |
6e8d25a6 | 5245 | scm_makprom (SCM code) |
0f2d19dd | 5246 | { |
28d52ebb MD |
5247 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5248 | SCM_UNPACK (code), | |
5249 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
5250 | } |
5251 | ||
28d52ebb MD |
5252 | static size_t |
5253 | promise_free (SCM promise) | |
5254 | { | |
5255 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
5256 | return 0; | |
5257 | } | |
1cc91f1b | 5258 | |
0f2d19dd | 5259 | static int |
e841c3e0 | 5260 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5261 | { |
19402679 | 5262 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5263 | scm_puts ("#<promise ", port); |
19402679 | 5264 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5265 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5266 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5267 | scm_putc ('>', port); |
0f2d19dd JB |
5268 | return !0; |
5269 | } | |
5270 | ||
3b3b36dd | 5271 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5272 | (SCM promise), |
67e8151b MG |
5273 | "If the promise @var{x} has not been computed yet, compute and\n" |
5274 | "return @var{x}, otherwise just return the previously computed\n" | |
5275 | "value.") | |
1bbd0b84 | 5276 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5277 | { |
28d52ebb MD |
5278 | SCM_VALIDATE_SMOB (1, promise, promise); |
5279 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
5280 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5281 | { |
28d52ebb MD |
5282 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5283 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5284 | { |
28d52ebb MD |
5285 | SCM_SET_PROMISE_DATA (promise, ans); |
5286 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5287 | } |
5288 | } | |
28d52ebb MD |
5289 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
5290 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 5291 | } |
1bbd0b84 | 5292 | #undef FUNC_NAME |
0f2d19dd | 5293 | |
445f675c | 5294 | |
a1ec6916 | 5295 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5296 | (SCM obj), |
b380b885 | 5297 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5298 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5299 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5300 | { |
67e8151b | 5301 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5302 | } |
1bbd0b84 | 5303 | #undef FUNC_NAME |
0f2d19dd | 5304 | |
445f675c | 5305 | |
a1ec6916 | 5306 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5307 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5308 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5309 | "Any source properties associated with @var{xorig} are also associated\n" | |
5310 | "with the new pair.") | |
1bbd0b84 | 5311 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5312 | { |
5313 | SCM p, z; | |
16d4699b | 5314 | z = scm_cons (x, y); |
26d5b9b4 MD |
5315 | /* Copy source properties possibly associated with xorig. */ |
5316 | p = scm_whash_lookup (scm_source_whash, xorig); | |
445f675c | 5317 | if (!SCM_IMP (p)) |
26d5b9b4 MD |
5318 | scm_whash_insert (scm_source_whash, z, p); |
5319 | return z; | |
5320 | } | |
1bbd0b84 | 5321 | #undef FUNC_NAME |
26d5b9b4 | 5322 | |
445f675c | 5323 | |
a1ec6916 | 5324 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5325 | (SCM obj), |
b380b885 MD |
5326 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
5327 | "pointer to the new data structure. @code{copy-tree} recurses down the\n" | |
5328 | "contents of both pairs and vectors (since both cons cells and vector\n" | |
5329 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5330 | "any other object.") | |
1bbd0b84 | 5331 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd JB |
5332 | { |
5333 | SCM ans, tl; | |
26d5b9b4 | 5334 | if (SCM_IMP (obj)) |
ff467021 | 5335 | return obj; |
3910272e MD |
5336 | if (SCM_VECTORP (obj)) |
5337 | { | |
c014a02e | 5338 | unsigned long i = SCM_VECTOR_LENGTH (obj); |
00ffa0e7 | 5339 | ans = scm_c_make_vector (i, SCM_UNSPECIFIED); |
3910272e | 5340 | while (i--) |
34d19ef6 | 5341 | SCM_VECTOR_SET (ans, i, scm_copy_tree (SCM_VELTS (obj)[i])); |
3910272e MD |
5342 | return ans; |
5343 | } | |
01f11e02 | 5344 | if (!SCM_CONSP (obj)) |
0f2d19dd | 5345 | return obj; |
26d5b9b4 MD |
5346 | ans = tl = scm_cons_source (obj, |
5347 | scm_copy_tree (SCM_CAR (obj)), | |
5348 | SCM_UNSPECIFIED); | |
05b15362 | 5349 | for (obj = SCM_CDR (obj); SCM_CONSP (obj); obj = SCM_CDR (obj)) |
a23afe53 MD |
5350 | { |
5351 | SCM_SETCDR (tl, scm_cons (scm_copy_tree (SCM_CAR (obj)), | |
5352 | SCM_UNSPECIFIED)); | |
5353 | tl = SCM_CDR (tl); | |
5354 | } | |
5355 | SCM_SETCDR (tl, obj); | |
0f2d19dd JB |
5356 | return ans; |
5357 | } | |
1bbd0b84 | 5358 | #undef FUNC_NAME |
0f2d19dd | 5359 | |
1cc91f1b | 5360 | |
4163eb72 MV |
5361 | /* We have three levels of EVAL here: |
5362 | ||
5363 | - scm_i_eval (exp, env) | |
5364 | ||
5365 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5366 | structure as used by the actual tree code evaluator. When ENV is | |
5367 | a top-level environment, then changes to the current module are | |
a513ead3 | 5368 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5369 | the current module. |
5370 | ||
5371 | - scm_primitive_eval (exp) | |
5372 | ||
5373 | evaluates EXP in the top-level environment as determined by the | |
5374 | current module. This is done by constructing a suitable | |
5375 | environment and calling scm_i_eval. Thus, changes to the | |
5376 | top-level module are tracked normally. | |
5377 | ||
5378 | - scm_eval (exp, mod) | |
5379 | ||
a513ead3 | 5380 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
5381 | setting the current module to MOD, invoking scm_primitive_eval on |
5382 | EXP, and then restoring the current module to the value it had | |
5383 | previously. That is, while EXP is evaluated, changes to the | |
5384 | current module are tracked, but these changes do not persist when | |
5385 | scm_eval returns. | |
5386 | ||
5387 | For each level of evals, there are two variants, distinguished by a | |
5388 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5389 | variant can destructively modify EXP into something completely | |
5390 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5391 | _x variants should not ever be used again for anything. So when in | |
5392 | doubt, use the ordinary variant. | |
5393 | ||
5394 | */ | |
5395 | ||
0f2d19dd | 5396 | SCM |
68d8be66 | 5397 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5398 | { |
68d8be66 | 5399 | return SCM_XEVAL (exp, env); |
0f2d19dd JB |
5400 | } |
5401 | ||
68d8be66 MD |
5402 | SCM |
5403 | scm_i_eval (SCM exp, SCM env) | |
5404 | { | |
26fb6390 | 5405 | exp = scm_copy_tree (exp); |
e37a4fba | 5406 | return SCM_XEVAL (exp, env); |
68d8be66 MD |
5407 | } |
5408 | ||
5409 | SCM | |
4163eb72 | 5410 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5411 | { |
a513ead3 | 5412 | SCM env; |
bcdab802 | 5413 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5414 | if (SCM_NIMP (transformer)) |
fdc28395 | 5415 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5416 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5417 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5418 | } |
5419 | ||
4163eb72 MV |
5420 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5421 | (SCM exp), | |
2069af38 | 5422 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5423 | "the current module.") |
5424 | #define FUNC_NAME s_scm_primitive_eval | |
5425 | { | |
a513ead3 | 5426 | SCM env; |
bcdab802 | 5427 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5428 | if (SCM_NIMP (transformer)) |
fdc28395 | 5429 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5430 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5431 | return scm_i_eval (exp, env); |
5432 | } | |
5433 | #undef FUNC_NAME | |
5434 | ||
6bff1368 | 5435 | |
68d8be66 MD |
5436 | /* Eval does not take the second arg optionally. This is intentional |
5437 | * in order to be R5RS compatible, and to prepare for the new module | |
5438 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5439 | * environment explicit. */ |
549e6ec6 | 5440 | |
09074dbf DH |
5441 | static void |
5442 | change_environment (void *data) | |
5443 | { | |
5444 | SCM pair = SCM_PACK (data); | |
5445 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 5446 | SCM old_module = scm_current_module (); |
09074dbf | 5447 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 5448 | scm_set_current_module (new_module); |
09074dbf DH |
5449 | } |
5450 | ||
09074dbf DH |
5451 | static void |
5452 | restore_environment (void *data) | |
5453 | { | |
5454 | SCM pair = SCM_PACK (data); | |
5455 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 5456 | SCM new_module = scm_current_module (); |
2e9c835d | 5457 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 5458 | scm_set_current_module (old_module); |
09074dbf DH |
5459 | } |
5460 | ||
4163eb72 MV |
5461 | static SCM |
5462 | inner_eval_x (void *data) | |
5463 | { | |
5464 | return scm_primitive_eval_x (SCM_PACK(data)); | |
5465 | } | |
5466 | ||
5467 | SCM | |
5468 | scm_eval_x (SCM exp, SCM module) | |
5469 | #define FUNC_NAME "eval!" | |
5470 | { | |
5471 | SCM_VALIDATE_MODULE (2, module); | |
5472 | ||
5473 | return scm_internal_dynamic_wind | |
5474 | (change_environment, inner_eval_x, restore_environment, | |
5475 | (void *) SCM_UNPACK (exp), | |
5476 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
5477 | } | |
5478 | #undef FUNC_NAME | |
5479 | ||
5480 | static SCM | |
5481 | inner_eval (void *data) | |
5482 | { | |
5483 | return scm_primitive_eval (SCM_PACK(data)); | |
5484 | } | |
09074dbf | 5485 | |
68d8be66 | 5486 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
5487 | (SCM exp, SCM module), |
5488 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
5489 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 5490 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
5491 | "@var{module} is made the current module. The current module\n" |
5492 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 5493 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5494 | { |
4163eb72 | 5495 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
5496 | |
5497 | return scm_internal_dynamic_wind | |
5498 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
5499 | (void *) SCM_UNPACK (exp), |
5500 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 5501 | } |
1bbd0b84 | 5502 | #undef FUNC_NAME |
0f2d19dd | 5503 | |
6dbd0af5 MD |
5504 | |
5505 | /* At this point, scm_deval and scm_dapply are generated. | |
5506 | */ | |
5507 | ||
a44a9715 DH |
5508 | #define DEVAL |
5509 | #include "eval.c" | |
0f2d19dd | 5510 | |
1cc91f1b | 5511 | |
0f2d19dd JB |
5512 | void |
5513 | scm_init_eval () | |
0f2d19dd | 5514 | { |
33b97402 MD |
5515 | scm_init_opts (scm_evaluator_traps, |
5516 | scm_evaluator_trap_table, | |
5517 | SCM_N_EVALUATOR_TRAPS); | |
5518 | scm_init_opts (scm_eval_options_interface, | |
5519 | scm_eval_opts, | |
5520 | SCM_N_EVAL_OPTIONS); | |
5521 | ||
f99c9c28 MD |
5522 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
5523 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 5524 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 5525 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 5526 | |
a44a9715 DH |
5527 | undefineds = scm_list_1 (SCM_UNDEFINED); |
5528 | SCM_SETCDR (undefineds, undefineds); | |
5529 | scm_permanent_object (undefineds); | |
7c33806a | 5530 | |
a44a9715 | 5531 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 5532 | |
a44a9715 DH |
5533 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
5534 | scm_permanent_object (f_apply); | |
86d31dfe | 5535 | |
a0599745 | 5536 | #include "libguile/eval.x" |
60a49842 | 5537 | |
25eaf21a | 5538 | scm_add_feature ("delay"); |
0f2d19dd | 5539 | } |
0f2d19dd | 5540 | |
6dbd0af5 | 5541 | #endif /* !DEVAL */ |
89e00824 ML |
5542 | |
5543 | /* | |
5544 | Local Variables: | |
5545 | c-file-style: "gnu" | |
5546 | End: | |
5547 | */ |