Commit | Line | Data |
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d0b07b5d | 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003 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 | |
140 | * signalled. | |
141 | */ | |
142 | static const char s_mixed_body_forms[] = "Mixed definitions and expressions in"; | |
143 | ||
2a6f7afe DH |
144 | /* Case or cond expressions must have at least one clause. If a case or cond |
145 | * expression without any clauses is detected, a 'Missing clauses' error is | |
146 | * signalled. */ | |
147 | static const char s_missing_clauses[] = "Missing clauses"; | |
148 | ||
609a8b86 DH |
149 | /* If there is an 'else' clause in a case or a cond statement, it must be the |
150 | * last clause. If after the 'else' case clause further clauses are detected, | |
151 | * a 'Misplaced else clause' error is signalled. */ | |
152 | static const char s_misplaced_else_clause[] = "Misplaced else clause"; | |
153 | ||
2a6f7afe DH |
154 | /* If a case clause is detected that is not in the format |
155 | * (<label(s)> <expression1> <expression2> ...) | |
156 | * a 'Bad case clause' error is signalled. */ | |
157 | static const char s_bad_case_clause[] = "Bad case clause"; | |
158 | ||
2a6f7afe DH |
159 | /* If a case clause is detected where the <label(s)> element is neither a |
160 | * proper list nor (in case of the last clause) the syntactic keyword 'else', | |
161 | * a 'Bad case labels' error is signalled. Note: If you encounter this error | |
162 | * for an else-clause which seems to be syntactically correct, check if 'else' | |
163 | * is really a syntactic keyword in that context. If 'else' is bound in the | |
164 | * local or global environment, it is not considered a syntactic keyword, but | |
165 | * will be treated as any other variable. */ | |
166 | static const char s_bad_case_labels[] = "Bad case labels"; | |
167 | ||
168 | /* In a case statement all labels have to be distinct. If in a case statement | |
169 | * a label occurs more than once, a 'Duplicate case label' error is | |
170 | * signalled. */ | |
171 | static const char s_duplicate_case_label[] = "Duplicate case label"; | |
172 | ||
609a8b86 DH |
173 | /* If a cond clause is detected that is not in one of the formats |
174 | * (<test> <expression1> ...) or (else <expression1> <expression2> ...) | |
175 | * a 'Bad cond clause' error is signalled. */ | |
176 | static const char s_bad_cond_clause[] = "Bad cond clause"; | |
177 | ||
178 | /* If a cond clause is detected that uses the alternate '=>' form, but does | |
179 | * not hold a recipient element for the test result, a 'Missing recipient' | |
180 | * error is signalled. */ | |
181 | static const char s_missing_recipient[] = "Missing recipient in"; | |
182 | ||
cc56ba80 DH |
183 | /* If in a position where a variable name is required some other object is |
184 | * detected, a 'Bad variable' error is signalled. */ | |
185 | static const char s_bad_variable[] = "Bad variable"; | |
186 | ||
a954ce1d DH |
187 | /* Bindings for forms like 'let' and 'do' have to be given in a proper, |
188 | * possibly empty list. If any other object is detected in a place where a | |
189 | * list of bindings was required, a 'Bad bindings' error is signalled. */ | |
190 | static const char s_bad_bindings[] = "Bad bindings"; | |
191 | ||
192 | /* Depending on the syntactic context, a binding has to be in the format | |
193 | * (<variable> <expression>) or (<variable> <expression1> <expression2>). | |
194 | * If anything else is detected in a place where a binding was expected, a | |
195 | * 'Bad binding' error is signalled. */ | |
196 | static const char s_bad_binding[] = "Bad binding"; | |
197 | ||
4610b011 DH |
198 | /* Some syntactic forms don't allow variable names to appear more than once in |
199 | * a list of bindings. If such a situation is nevertheless detected, a | |
200 | * 'Duplicate binding' error is signalled. */ | |
201 | static const char s_duplicate_binding[] = "Duplicate binding"; | |
202 | ||
a954ce1d DH |
203 | /* If the exit form of a 'do' expression is not in the format |
204 | * (<test> <expression> ...) | |
205 | * a 'Bad exit clause' error is signalled. */ | |
206 | static const char s_bad_exit_clause[] = "Bad exit clause"; | |
207 | ||
03a3e941 DH |
208 | /* The formal function arguments of a lambda expression have to be either a |
209 | * single symbol or a non-cyclic list. For anything else a 'Bad formals' | |
210 | * error is signalled. */ | |
211 | static const char s_bad_formals[] = "Bad formals"; | |
212 | ||
213 | /* If in a lambda expression something else than a symbol is detected at a | |
214 | * place where a formal function argument is required, a 'Bad formal' error is | |
215 | * signalled. */ | |
216 | static const char s_bad_formal[] = "Bad formal"; | |
217 | ||
218 | /* If in the arguments list of a lambda expression an argument name occurs | |
219 | * more than once, a 'Duplicate formal' error is signalled. */ | |
220 | static const char s_duplicate_formal[] = "Duplicate formal"; | |
221 | ||
6f81708a DH |
222 | /* If the evaluation of an unquote-splicing expression gives something else |
223 | * than a proper list, a 'Non-list result for unquote-splicing' error is | |
224 | * signalled. */ | |
225 | static const char s_splicing[] = "Non-list result for unquote-splicing"; | |
226 | ||
9a848baf DH |
227 | /* If something else than an exact integer is detected as the argument for |
228 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
229 | static const char s_bad_slot_number[] = "Bad slot number"; | |
230 | ||
e6729603 DH |
231 | |
232 | /* Signal a syntax error. We distinguish between the form that caused the | |
233 | * error and the enclosing expression. The error message will print out as | |
234 | * shown in the following pattern. The file name and line number are only | |
235 | * given when they can be determined from the erroneous form or from the | |
236 | * enclosing expression. | |
237 | * | |
238 | * <filename>: In procedure memoization: | |
239 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
240 | ||
241 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
242 | ||
243 | /* The prototype is needed to indicate that the function does not return. */ | |
244 | static void | |
245 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
246 | ||
247 | static void | |
248 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
249 | { | |
250 | const SCM msg_string = scm_makfrom0str (msg); | |
251 | SCM filename = SCM_BOOL_F; | |
252 | SCM linenr = SCM_BOOL_F; | |
253 | const char *format; | |
254 | SCM args; | |
255 | ||
256 | if (SCM_CONSP (form)) | |
257 | { | |
258 | filename = scm_source_property (form, scm_sym_filename); | |
259 | linenr = scm_source_property (form, scm_sym_line); | |
260 | } | |
261 | ||
262 | if (SCM_FALSEP (filename) && SCM_FALSEP (linenr) && SCM_CONSP (expr)) | |
263 | { | |
264 | filename = scm_source_property (expr, scm_sym_filename); | |
265 | linenr = scm_source_property (expr, scm_sym_line); | |
266 | } | |
267 | ||
268 | if (!SCM_UNBNDP (expr)) | |
269 | { | |
270 | if (!SCM_FALSEP (filename)) | |
271 | { | |
272 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
273 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
274 | } | |
275 | else if (!SCM_FALSEP (linenr)) | |
276 | { | |
277 | format = "In line ~S: ~A ~S in expression ~S."; | |
278 | args = scm_list_4 (linenr, msg_string, form, expr); | |
279 | } | |
280 | else | |
281 | { | |
282 | format = "~A ~S in expression ~S."; | |
283 | args = scm_list_3 (msg_string, form, expr); | |
284 | } | |
285 | } | |
286 | else | |
287 | { | |
288 | if (!SCM_FALSEP (filename)) | |
289 | { | |
290 | format = "In file ~S, line ~S: ~A ~S."; | |
291 | args = scm_list_4 (filename, linenr, msg_string, form); | |
292 | } | |
293 | else if (!SCM_FALSEP (linenr)) | |
294 | { | |
295 | format = "In line ~S: ~A ~S."; | |
296 | args = scm_list_3 (linenr, msg_string, form); | |
297 | } | |
298 | else | |
299 | { | |
300 | format = "~A ~S."; | |
301 | args = scm_list_2 (msg_string, form); | |
302 | } | |
303 | } | |
304 | ||
305 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
306 | } | |
307 | ||
308 | ||
309 | /* Shortcut macros to simplify syntax error handling. */ | |
310 | #define ASSERT_SYNTAX(cond, message, form) \ | |
311 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
312 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
313 | { if (!(cond)) syntax_error (message, form, expr); } | |
314 | ||
315 | \f | |
316 | ||
d0624e39 DH |
317 | /* {Ilocs} |
318 | * | |
319 | * Ilocs are memoized references to variables in local environment frames. | |
320 | * They are represented as three values: The relative offset of the | |
321 | * environment frame, the number of the binding within that frame, and a | |
322 | * boolean value indicating whether the binding is the last binding in the | |
323 | * frame. | |
324 | */ | |
325 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) | |
326 | #define SCM_IDINC (0x00100000L) | |
327 | #define SCM_IDSTMSK (-SCM_IDINC) | |
328 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ | |
329 | SCM_PACK ( \ | |
330 | ((frame_nr) << 8) \ | |
331 | + ((binding_nr) << 20) \ | |
332 | + ((last_p) ? SCM_ICDR : 0) \ | |
333 | + scm_tc8_iloc ) | |
334 | ||
335 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) | |
336 | ||
337 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
338 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, | |
339 | (SCM frame, SCM binding, SCM cdrp), | |
340 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
341 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
342 | #define FUNC_NAME s_scm_dbg_make_iloc | |
343 | { | |
344 | SCM_VALIDATE_INUM (1, frame); | |
345 | SCM_VALIDATE_INUM (2, binding); | |
346 | return SCM_MAKE_ILOC (SCM_INUM (frame), | |
347 | SCM_INUM (binding), | |
348 | !SCM_FALSEP (cdrp)); | |
349 | } | |
350 | #undef FUNC_NAME | |
351 | ||
352 | SCM scm_dbg_iloc_p (SCM obj); | |
353 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, | |
354 | (SCM obj), | |
355 | "Return @code{#t} if @var{obj} is an iloc.") | |
356 | #define FUNC_NAME s_scm_dbg_iloc_p | |
357 | { | |
358 | return SCM_BOOL (SCM_ILOCP (obj)); | |
359 | } | |
360 | #undef FUNC_NAME | |
361 | ||
362 | #endif | |
363 | ||
364 | \f | |
365 | ||
6f81708a DH |
366 | /* The function lookup_symbol is used during memoization: Lookup the symbol |
367 | * in the environment. If there is no binding for the symbol, SCM_UNDEFINED | |
368 | * is returned. If the symbol is a syntactic keyword, the macro object to | |
369 | * which the symbol is bound is returned. If the symbol is a global variable, | |
370 | * the variable object to which the symbol is bound is returned. Finally, if | |
371 | * the symbol is a local variable the corresponding iloc object is returned. | |
372 | */ | |
373 | ||
374 | /* A helper function for lookup_symbol: Try to find the symbol in the top | |
375 | * level environment frame. The function returns SCM_UNDEFINED if the symbol | |
376 | * is unbound, it returns a macro object if the symbol is a syntactic keyword | |
377 | * and it returns a variable object if the symbol is a global variable. */ | |
378 | static SCM | |
379 | lookup_global_symbol (const SCM symbol, const SCM top_level) | |
380 | { | |
381 | const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F); | |
382 | if (SCM_FALSEP (variable)) | |
383 | { | |
384 | return SCM_UNDEFINED; | |
385 | } | |
386 | else | |
387 | { | |
388 | const SCM value = SCM_VARIABLE_REF (variable); | |
389 | if (SCM_MACROP (value)) | |
390 | return value; | |
391 | else | |
392 | return variable; | |
393 | } | |
394 | } | |
395 | ||
396 | static SCM | |
397 | lookup_symbol (const SCM symbol, const SCM env) | |
398 | { | |
399 | SCM frame_idx; | |
400 | unsigned int frame_nr; | |
401 | ||
402 | for (frame_idx = env, frame_nr = 0; | |
403 | !SCM_NULLP (frame_idx); | |
404 | frame_idx = SCM_CDR (frame_idx), ++frame_nr) | |
405 | { | |
406 | const SCM frame = SCM_CAR (frame_idx); | |
407 | if (SCM_CONSP (frame)) | |
408 | { | |
409 | /* frame holds a local environment frame */ | |
410 | SCM symbol_idx; | |
411 | unsigned int symbol_nr; | |
412 | ||
413 | for (symbol_idx = SCM_CAR (frame), symbol_nr = 0; | |
414 | SCM_CONSP (symbol_idx); | |
415 | symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr) | |
416 | { | |
417 | if (SCM_EQ_P (SCM_CAR (symbol_idx), symbol)) | |
418 | /* found the symbol, therefore return the iloc */ | |
419 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0); | |
420 | } | |
421 | if (SCM_EQ_P (symbol_idx, symbol)) | |
422 | /* found the symbol as the last element of the current frame */ | |
423 | return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1); | |
424 | } | |
425 | else | |
426 | { | |
427 | /* no more local environment frames */ | |
428 | return lookup_global_symbol (symbol, frame); | |
429 | } | |
430 | } | |
431 | ||
432 | return lookup_global_symbol (symbol, SCM_BOOL_F); | |
433 | } | |
434 | ||
435 | ||
436 | /* Return true if the symbol is - from the point of view of a macro | |
437 | * transformer - a literal in the sense specified in chapter "pattern | |
438 | * language" of R5RS. In the code below, however, we don't match the | |
439 | * definition of R5RS exactly: It returns true if the identifier has no | |
440 | * binding or if it is a syntactic keyword. */ | |
441 | static int | |
442 | literal_p (const SCM symbol, const SCM env) | |
443 | { | |
444 | const SCM value = lookup_symbol (symbol, env); | |
445 | if (SCM_UNBNDP (value) || SCM_MACROP (value)) | |
446 | return 1; | |
447 | else | |
448 | return 0; | |
449 | } | |
17fa3fcf DH |
450 | |
451 | \f | |
452 | ||
6dbd0af5 MD |
453 | /* The evaluator contains a plethora of EVAL symbols. |
454 | * This is an attempt at explanation. | |
455 | * | |
456 | * The following macros should be used in code which is read twice | |
457 | * (where the choice of evaluator is hard soldered): | |
458 | * | |
459 | * SCM_CEVAL is the symbol used within one evaluator to call itself. | |
460 | * Originally, it is defined to scm_ceval, but is redefined to | |
461 | * scm_deval during the second pass. | |
462 | * | |
6cb702da | 463 | * SCM_EVALIM is used when it is known that the expression is an |
6dbd0af5 MD |
464 | * immediate. (This macro never calls an evaluator.) |
465 | * | |
466 | * EVALCAR evaluates the car of an expression. | |
467 | * | |
6dbd0af5 MD |
468 | * The following macros should be used in code which is read once |
469 | * (where the choice of evaluator is dynamic): | |
470 | * | |
6cb702da | 471 | * SCM_XEVAL takes care of immediates without calling an evaluator. It |
6dbd0af5 MD |
472 | * then calls scm_ceval *or* scm_deval, depending on the debugging |
473 | * mode. | |
474 | * | |
6cb702da | 475 | * SCM_XEVALCAR corresponds to EVALCAR, but uses scm_ceval *or* scm_deval |
6dbd0af5 MD |
476 | * depending on the debugging mode. |
477 | * | |
478 | * The main motivation for keeping this plethora is efficiency | |
479 | * together with maintainability (=> locality of code). | |
480 | */ | |
481 | ||
6cb702da | 482 | #define SCM_CEVAL scm_ceval |
0f2d19dd | 483 | |
e90c3a89 DH |
484 | #define SCM_EVALIM2(x) \ |
485 | ((SCM_EQ_P ((x), SCM_EOL) \ | |
89bff2fc | 486 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ |
e90c3a89 DH |
487 | : 0), \ |
488 | (x)) | |
489 | ||
490 | #define SCM_EVALIM(x, env) (SCM_ILOCP (x) \ | |
491 | ? *scm_ilookup ((x), env) \ | |
492 | : SCM_EVALIM2(x)) | |
493 | ||
494 | #define SCM_XEVAL(x, env) (SCM_IMP (x) \ | |
495 | ? SCM_EVALIM2(x) \ | |
496 | : (*scm_ceval_ptr) ((x), (env))) | |
497 | ||
498 | #define SCM_XEVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ | |
499 | ? SCM_EVALIM (SCM_CAR (x), env) \ | |
500 | : (SCM_SYMBOLP (SCM_CAR (x)) \ | |
501 | ? *scm_lookupcar (x, env, 1) \ | |
502 | : (*scm_ceval_ptr) (SCM_CAR (x), env))) | |
503 | ||
8c494e99 | 504 | #define EVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ |
904a077d | 505 | ? SCM_EVALIM (SCM_CAR (x), env) \ |
680516ba DH |
506 | : (SCM_SYMBOLP (SCM_CAR (x)) \ |
507 | ? *scm_lookupcar (x, env, 1) \ | |
508 | : SCM_CEVAL (SCM_CAR (x), env))) | |
0f2d19dd | 509 | |
28d52ebb | 510 | SCM_REC_MUTEX (source_mutex); |
9bc4701c | 511 | |
12841895 DH |
512 | |
513 | /* Lookup a given local variable in an environment. The local variable is | |
514 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
515 | * indicates the relative number of the environment frame (counting upwards | |
516 | * from the innermost environment frame), binding indicates the number of the | |
517 | * binding within the frame, and last? (which is extracted from the iloc using | |
518 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
519 | * very end of the improper list of bindings. */ | |
0f2d19dd | 520 | SCM * |
6e8d25a6 | 521 | scm_ilookup (SCM iloc, SCM env) |
0f2d19dd | 522 | { |
12841895 DH |
523 | unsigned int frame_nr = SCM_IFRAME (iloc); |
524 | unsigned int binding_nr = SCM_IDIST (iloc); | |
525 | SCM frames = env; | |
526 | SCM bindings; | |
527 | ||
528 | for (; 0 != frame_nr; --frame_nr) | |
529 | frames = SCM_CDR (frames); | |
530 | ||
531 | bindings = SCM_CAR (frames); | |
532 | for (; 0 != binding_nr; --binding_nr) | |
533 | bindings = SCM_CDR (bindings); | |
534 | ||
0f2d19dd | 535 | if (SCM_ICDRP (iloc)) |
12841895 DH |
536 | return SCM_CDRLOC (bindings); |
537 | return SCM_CARLOC (SCM_CDR (bindings)); | |
0f2d19dd | 538 | } |
0f2d19dd | 539 | |
12841895 | 540 | |
89bff2fc DH |
541 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); |
542 | ||
543 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
544 | static void | |
545 | error_unbound_variable (SCM symbol) | |
546 | { | |
547 | scm_error (scm_unbound_variable_key, NULL, | |
548 | "Unbound variable: ~S", | |
549 | scm_list_1 (symbol), SCM_BOOL_F); | |
550 | } | |
551 | ||
552 | ||
f8769b1d MV |
553 | /* The Lookup Car Race |
554 | - by Eva Luator | |
555 | ||
556 | Memoization of variables and special forms is done while executing | |
557 | the code for the first time. As long as there is only one thread | |
558 | everything is fine, but as soon as two threads execute the same | |
559 | code concurrently `for the first time' they can come into conflict. | |
560 | ||
561 | This memoization includes rewriting variable references into more | |
562 | efficient forms and expanding macros. Furthermore, macro expansion | |
563 | includes `compiling' special forms like `let', `cond', etc. into | |
564 | tree-code instructions. | |
565 | ||
566 | There shouldn't normally be a problem with memoizing local and | |
904a077d | 567 | global variable references (into ilocs and variables), because all |
f8769b1d MV |
568 | threads will mutate the code in *exactly* the same way and (if I |
569 | read the C code correctly) it is not possible to observe a half-way | |
570 | mutated cons cell. The lookup procedure can handle this | |
571 | transparently without any critical sections. | |
572 | ||
573 | It is different with macro expansion, because macro expansion | |
574 | happens outside of the lookup procedure and can't be | |
904a077d MV |
575 | undone. Therefore the lookup procedure can't cope with it. It has |
576 | to indicate failure when it detects a lost race and hope that the | |
577 | caller can handle it. Luckily, it turns out that this is the case. | |
f8769b1d | 578 | |
904a077d | 579 | An example to illustrate this: Suppose that the following form will |
f8769b1d MV |
580 | be memoized concurrently by two threads |
581 | ||
582 | (let ((x 12)) x) | |
583 | ||
584 | Let's first examine the lookup of X in the body. The first thread | |
585 | decides that it has to find the symbol "x" in the environment and | |
586 | starts to scan it. Then the other thread takes over and actually | |
587 | overtakes the first. It looks up "x" and substitutes an | |
588 | appropriate iloc for it. Now the first thread continues and | |
589 | completes its lookup. It comes to exactly the same conclusions as | |
590 | the second one and could - without much ado - just overwrite the | |
591 | iloc with the same iloc. | |
592 | ||
593 | But let's see what will happen when the race occurs while looking | |
594 | up the symbol "let" at the start of the form. It could happen that | |
595 | the second thread interrupts the lookup of the first thread and not | |
904a077d MV |
596 | only substitutes a variable for it but goes right ahead and |
597 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
598 | the first thread completes its lookup, it would replace the #@let* | |
599 | with a variable containing the "let" binding, effectively reverting | |
600 | the form to (let (x 12) x). This is wrong. It has to detect that | |
601 | it has lost the race and the evaluator has to reconsider the | |
602 | changed form completely. | |
f8769b1d MV |
603 | |
604 | This race condition could be resolved with some kind of traffic | |
605 | light (like mutexes) around scm_lookupcar, but I think that it is | |
606 | best to avoid them in this case. They would serialize memoization | |
607 | completely and because lookup involves calling arbitrary Scheme | |
608 | code (via the lookup-thunk), threads could be blocked for an | |
609 | arbitrary amount of time or even deadlock. But with the current | |
610 | solution a lot of unnecessary work is potentially done. */ | |
611 | ||
9aa82b39 | 612 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to |
f8769b1d MV |
613 | return NULL to indicate a failed lookup due to some race conditions |
614 | between threads. This only happens when VLOC is the first cell of | |
615 | a special form that will eventually be memoized (like `let', etc.) | |
616 | In that case the whole lookup is bogus and the caller has to | |
617 | reconsider the complete special form. | |
618 | ||
619 | SCM_LOOKUPCAR is still there, of course. It just calls | |
de513fa0 | 620 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR |
f8769b1d MV |
621 | should only be called when it is known that VLOC is not the first |
622 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
26d5b9b4 MD |
623 | for NULL. I think I've found the only places where this |
624 | applies. */ | |
f8769b1d | 625 | |
8ecf1f13 | 626 | static SCM * |
26d5b9b4 | 627 | scm_lookupcar1 (SCM vloc, SCM genv, int check) |
0f2d19dd JB |
628 | { |
629 | SCM env = genv; | |
e3173f93 | 630 | register SCM *al, fl, var = SCM_CAR (vloc); |
0f2d19dd | 631 | register SCM iloc = SCM_ILOC00; |
0f2d19dd JB |
632 | for (; SCM_NIMP (env); env = SCM_CDR (env)) |
633 | { | |
790071cd | 634 | if (!SCM_CONSP (SCM_CAR (env))) |
0f2d19dd | 635 | break; |
a23afe53 | 636 | al = SCM_CARLOC (env); |
0f2d19dd JB |
637 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) |
638 | { | |
01f11e02 | 639 | if (!SCM_CONSP (fl)) |
33b97402 | 640 | { |
cf498326 | 641 | if (SCM_EQ_P (fl, var)) |
0f2d19dd | 642 | { |
cf498326 | 643 | if (! SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 644 | goto race; |
3201d763 | 645 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); |
a23afe53 | 646 | return SCM_CDRLOC (*al); |
0f2d19dd | 647 | } |
33b97402 MD |
648 | else |
649 | break; | |
650 | } | |
a23afe53 | 651 | al = SCM_CDRLOC (*al); |
cf498326 | 652 | if (SCM_EQ_P (SCM_CAR (fl), var)) |
0f2d19dd | 653 | { |
0f2d19dd JB |
654 | if (SCM_UNBNDP (SCM_CAR (*al))) |
655 | { | |
656 | env = SCM_EOL; | |
657 | goto errout; | |
658 | } | |
c6772927 | 659 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 660 | goto race; |
a23afe53 | 661 | SCM_SETCAR (vloc, iloc); |
a23afe53 | 662 | return SCM_CARLOC (*al); |
0f2d19dd | 663 | } |
3201d763 | 664 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); |
0f2d19dd | 665 | } |
3201d763 | 666 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); |
0f2d19dd JB |
667 | } |
668 | { | |
86d31dfe | 669 | SCM top_thunk, real_var; |
790071cd | 670 | if (SCM_NIMP (env)) |
0f2d19dd | 671 | { |
86d31dfe MV |
672 | top_thunk = SCM_CAR (env); /* env now refers to a |
673 | top level env thunk */ | |
0f2d19dd JB |
674 | env = SCM_CDR (env); |
675 | } | |
676 | else | |
677 | top_thunk = SCM_BOOL_F; | |
86d31dfe MV |
678 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); |
679 | if (SCM_FALSEP (real_var)) | |
0f2d19dd | 680 | goto errout; |
86d31dfe | 681 | |
01f11e02 | 682 | if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
86d31dfe MV |
683 | { |
684 | errout: | |
86d31dfe MV |
685 | if (check) |
686 | { | |
687 | if (SCM_NULLP (env)) | |
89bff2fc | 688 | error_unbound_variable (var); |
86d31dfe MV |
689 | else |
690 | scm_misc_error (NULL, "Damaged environment: ~S", | |
8ea46249 | 691 | scm_list_1 (var)); |
86d31dfe MV |
692 | } |
693 | else | |
694 | { | |
695 | /* A variable could not be found, but we shall | |
696 | not throw an error. */ | |
697 | static SCM undef_object = SCM_UNDEFINED; | |
698 | return &undef_object; | |
699 | } | |
09e4d064 | 700 | } |
86d31dfe | 701 | |
c6772927 | 702 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
86d31dfe MV |
703 | { |
704 | /* Some other thread has changed the very cell we are working | |
705 | on. In effect, it must have done our job or messed it up | |
706 | completely. */ | |
707 | race: | |
708 | var = SCM_CAR (vloc); | |
d22a0ea1 MV |
709 | if (SCM_VARIABLEP (var)) |
710 | return SCM_VARIABLE_LOC (var); | |
86d31dfe MV |
711 | if (SCM_ITAG7 (var) == SCM_ITAG7 (SCM_ILOC00)) |
712 | return scm_ilookup (var, genv); | |
904a077d | 713 | /* We can't cope with anything else than variables and ilocs. When |
86d31dfe MV |
714 | a special form has been memoized (i.e. `let' into `#@let') we |
715 | return NULL and expect the calling function to do the right | |
716 | thing. For the evaluator, this means going back and redoing | |
717 | the dispatch on the car of the form. */ | |
718 | return NULL; | |
719 | } | |
f8769b1d | 720 | |
d22a0ea1 | 721 | SCM_SETCAR (vloc, real_var); |
86d31dfe MV |
722 | return SCM_VARIABLE_LOC (real_var); |
723 | } | |
0f2d19dd JB |
724 | } |
725 | ||
f8769b1d | 726 | SCM * |
6e8d25a6 | 727 | scm_lookupcar (SCM vloc, SCM genv, int check) |
f8769b1d | 728 | { |
26d5b9b4 | 729 | SCM *loc = scm_lookupcar1 (vloc, genv, check); |
f8769b1d MV |
730 | if (loc == NULL) |
731 | abort (); | |
732 | return loc; | |
733 | } | |
f8769b1d | 734 | |
1cc91f1b | 735 | |
0f2d19dd | 736 | SCM |
6e8d25a6 | 737 | scm_eval_car (SCM pair, SCM env) |
0f2d19dd | 738 | { |
6cb702da | 739 | return SCM_XEVALCAR (pair, env); |
0f2d19dd JB |
740 | } |
741 | ||
742 | \f | |
0f2d19dd | 743 | |
34adf7ea DH |
744 | /* Rewrite the body (which is given as the list of expressions forming the |
745 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
746 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
747 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
748 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
749 | * SCM_IM_LET, etc. The one exception is a body that belongs to a letrec that | |
750 | * has been formed by rewriting internal defines: It starts with SCM_IM_DEFINE | |
751 | * (instead of SCM_IM_LETREC). | |
752 | * | |
753 | * It is assumed that the calling expression has already made sure that the | |
754 | * body is a proper list. */ | |
26d5b9b4 | 755 | static SCM |
430b8401 | 756 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 757 | { |
26d5b9b4 | 758 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
759 | if (SCM_ISYMP (SCM_CAR (exprs))) |
760 | return exprs; | |
761 | else | |
762 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
763 | } |
764 | ||
1cc91f1b | 765 | |
910b5125 DH |
766 | /* The function m_expand_body memoizes a proper list of expressions forming a |
767 | * body. This function takes care of dealing with internal defines and | |
768 | * transforming them into an equivalent letrec expression. */ | |
769 | ||
770 | /* This is a helper function for m_expand_body. It helps to figure out whether | |
771 | * an expression denotes a syntactic keyword. */ | |
772 | static SCM | |
773 | try_macro_lookup (const SCM expr, const SCM env) | |
774 | { | |
775 | if (SCM_SYMBOLP (expr)) | |
776 | { | |
6f81708a | 777 | const SCM value = lookup_symbol (expr, env); |
910b5125 DH |
778 | return value; |
779 | } | |
780 | else | |
781 | { | |
782 | return SCM_UNDEFINED; | |
783 | } | |
784 | } | |
785 | ||
786 | /* This is a helper function for m_expand_body. It expands user macros, | |
787 | * because for the correct translation of a body we need to know whether they | |
788 | * expand to a definition. */ | |
789 | static SCM | |
790 | expand_user_macros (SCM expr, const SCM env) | |
791 | { | |
792 | while (SCM_CONSP (expr)) | |
793 | { | |
794 | const SCM car_expr = SCM_CAR (expr); | |
795 | const SCM new_car = expand_user_macros (car_expr, env); | |
796 | const SCM value = try_macro_lookup (new_car, env); | |
797 | ||
798 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
799 | { | |
800 | /* User macros transform code into code. */ | |
801 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
802 | /* We need to reiterate on the transformed code. */ | |
803 | } | |
804 | else | |
805 | { | |
806 | /* No user macro: return. */ | |
807 | SCM_SETCAR (expr, new_car); | |
808 | return expr; | |
809 | } | |
810 | } | |
811 | ||
812 | return expr; | |
813 | } | |
814 | ||
815 | /* This is a helper function for m_expand_body. It determines if a given form | |
816 | * represents an application of a given built-in macro. The built-in macro to | |
817 | * check for is identified by its syntactic keyword. The form is an | |
818 | * application of the given macro if looking up the car of the form in the | |
819 | * given environment actually returns the built-in macro. */ | |
820 | static int | |
821 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
822 | { | |
823 | if (SCM_CONSP (form)) | |
824 | { | |
825 | const SCM car_form = SCM_CAR (form); | |
826 | const SCM value = try_macro_lookup (car_form, env); | |
827 | if (SCM_BUILTIN_MACRO_P (value)) | |
828 | { | |
829 | const SCM macro_name = scm_macro_name (value); | |
830 | return SCM_EQ_P (macro_name, syntactic_keyword); | |
831 | } | |
832 | } | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
837 | static SCM | |
838 | m_expand_body (const SCM forms, const SCM env) | |
839 | { | |
840 | /* The first body form can be skipped since it is known to be the ISYM that | |
841 | * was prepended to the body by m_body. */ | |
842 | SCM cdr_forms = SCM_CDR (forms); | |
843 | SCM form_idx = cdr_forms; | |
844 | SCM definitions = SCM_EOL; | |
845 | SCM sequence = SCM_EOL; | |
846 | ||
847 | /* According to R5RS, the list of body forms consists of two parts: a number | |
848 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
849 | * expressions. Each the definitions and the expressions may be grouped | |
850 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
851 | * expressions. The task of the following loop therefore is to split the | |
852 | * list of body forms into the list of definitions and the sequence of | |
853 | * expressions. */ | |
854 | while (!SCM_NULLP (form_idx)) | |
855 | { | |
856 | const SCM form = SCM_CAR (form_idx); | |
857 | const SCM new_form = expand_user_macros (form, env); | |
858 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
859 | { | |
860 | definitions = scm_cons (new_form, definitions); | |
861 | form_idx = SCM_CDR (form_idx); | |
862 | } | |
863 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
864 | { | |
865 | /* We have encountered a group of forms. This has to be either a | |
866 | * (possibly empty) group of (possibly further grouped) definitions, | |
867 | * or a non-empty group of (possibly further grouped) | |
868 | * expressions. */ | |
869 | const SCM grouped_forms = SCM_CDR (new_form); | |
870 | unsigned int found_definition = 0; | |
871 | unsigned int found_expression = 0; | |
872 | SCM grouped_form_idx = grouped_forms; | |
873 | while (!found_expression && !SCM_NULLP (grouped_form_idx)) | |
874 | { | |
875 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
876 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
877 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
878 | { | |
879 | found_definition = 1; | |
880 | definitions = scm_cons (new_inner_form, definitions); | |
881 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
882 | } | |
883 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
884 | { | |
885 | const SCM inner_group = SCM_CDR (new_inner_form); | |
886 | grouped_form_idx | |
887 | = scm_append (scm_list_2 (inner_group, | |
888 | SCM_CDR (grouped_form_idx))); | |
889 | } | |
890 | else | |
891 | { | |
892 | /* The group marks the start of the expressions of the body. | |
893 | * We have to make sure that within the same group we have | |
894 | * not encountered a definition before. */ | |
895 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
896 | found_expression = 1; | |
897 | grouped_form_idx = SCM_EOL; | |
898 | } | |
899 | } | |
900 | ||
901 | /* We have finished processing the group. If we have not yet | |
902 | * encountered an expression we continue processing the forms of the | |
903 | * body to collect further definition forms. Otherwise, the group | |
904 | * marks the start of the sequence of expressions of the body. */ | |
905 | if (!found_expression) | |
906 | { | |
907 | form_idx = SCM_CDR (form_idx); | |
908 | } | |
909 | else | |
910 | { | |
911 | sequence = form_idx; | |
912 | form_idx = SCM_EOL; | |
913 | } | |
914 | } | |
915 | else | |
916 | { | |
917 | /* We have detected a form which is no definition. This marks the | |
918 | * start of the sequence of expressions of the body. */ | |
919 | sequence = form_idx; | |
920 | form_idx = SCM_EOL; | |
921 | } | |
922 | } | |
923 | ||
924 | /* FIXME: forms does not hold information about the file location. */ | |
925 | ASSERT_SYNTAX (SCM_CONSP (sequence), s_missing_body_expression, cdr_forms); | |
926 | ||
927 | if (!SCM_NULLP (definitions)) | |
928 | { | |
929 | SCM definition_idx; | |
930 | SCM letrec_tail; | |
931 | SCM letrec_expression; | |
932 | SCM new_letrec_expression; | |
933 | SCM new_body; | |
934 | ||
935 | SCM bindings = SCM_EOL; | |
936 | for (definition_idx = definitions; | |
937 | !SCM_NULLP (definition_idx); | |
938 | definition_idx = SCM_CDR (definition_idx)) | |
939 | { | |
940 | const SCM definition = SCM_CAR (definition_idx); | |
941 | const SCM canonical_definition = canonicalize_define (definition); | |
942 | const SCM binding = SCM_CDR (canonical_definition); | |
943 | bindings = scm_cons (binding, bindings); | |
944 | }; | |
945 | ||
946 | letrec_tail = scm_cons (bindings, sequence); | |
947 | /* FIXME: forms does not hold information about the file location. */ | |
948 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
949 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
950 | new_body = scm_list_1 (new_letrec_expression); | |
951 | return new_body; | |
952 | } | |
953 | else | |
954 | { | |
955 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
956 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
957 | return forms; | |
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."); | |
969 | return m_expand_body (exprs, env); | |
970 | } | |
971 | ||
972 | #endif | |
973 | ||
974 | ||
9fbee57e | 975 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
976 | |
977 | ||
3b88ed2a | 978 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 979 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 980 | |
8ea46249 | 981 | SCM |
e6729603 | 982 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 983 | { |
e6729603 DH |
984 | const SCM cdr_expr = SCM_CDR (expr); |
985 | const long length = scm_ilength (cdr_expr); | |
986 | ||
987 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
988 | ||
989 | if (length == 0) | |
990 | { | |
991 | /* Special case: (and) is replaced by #t. */ | |
992 | return SCM_BOOL_T; | |
993 | } | |
0f2d19dd | 994 | else |
e6729603 DH |
995 | { |
996 | SCM_SETCAR (expr, SCM_IM_AND); | |
997 | return expr; | |
998 | } | |
0f2d19dd JB |
999 | } |
1000 | ||
1cc91f1b | 1001 | |
3b88ed2a | 1002 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 1003 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
1004 | |
1005 | SCM | |
2a6f7afe | 1006 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1007 | { |
2a6f7afe | 1008 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
1009 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
1010 | * That means, there should be a distinction between uses of begin where an | |
1011 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
1012 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
1013 | ||
1014 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
1015 | return expr; | |
0f2d19dd JB |
1016 | } |
1017 | ||
1018 | ||
3b88ed2a | 1019 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 1020 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
6f81708a | 1021 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
1cc91f1b | 1022 | |
8ea46249 | 1023 | SCM |
2a6f7afe | 1024 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 1025 | { |
8ea46249 | 1026 | SCM clauses; |
2a6f7afe DH |
1027 | SCM all_labels = SCM_EOL; |
1028 | ||
1029 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
1030 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1031 | ||
1032 | const SCM cdr_expr = SCM_CDR (expr); | |
1033 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1034 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
1035 | ||
1036 | clauses = SCM_CDR (cdr_expr); | |
8ea46249 | 1037 | while (!SCM_NULLP (clauses)) |
0f2d19dd | 1038 | { |
2a6f7afe DH |
1039 | SCM labels; |
1040 | ||
1041 | const SCM clause = SCM_CAR (clauses); | |
1042 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
1043 | s_bad_case_clause, clause, expr); | |
1044 | ||
1045 | labels = SCM_CAR (clause); | |
1046 | if (SCM_CONSP (labels)) | |
1047 | { | |
1048 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
1049 | s_bad_case_labels, labels, expr); | |
1050 | all_labels = scm_append_x (scm_list_2 (labels, all_labels)); | |
1051 | } | |
58a2510b DH |
1052 | else if (SCM_NULLP (labels)) |
1053 | { | |
1054 | /* The list of labels is empty. According to R5RS this is allowed. | |
1055 | * It means that the sequence of expressions will never be executed. | |
1056 | * Therefore, as an optimization, we could remove the whole | |
1057 | * clause. */ | |
1058 | } | |
2a6f7afe DH |
1059 | else |
1060 | { | |
1061 | ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p, | |
1062 | s_bad_case_labels, labels, expr); | |
1063 | ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)), | |
609a8b86 | 1064 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
1065 | } |
1066 | ||
1067 | /* build the new clause */ | |
1068 | if (SCM_EQ_P (labels, scm_sym_else)) | |
1069 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
1070 | ||
8ea46249 | 1071 | clauses = SCM_CDR (clauses); |
0f2d19dd | 1072 | } |
2a6f7afe DH |
1073 | |
1074 | /* Check whether all case labels are distinct. */ | |
1075 | for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels)) | |
1076 | { | |
1077 | const SCM label = SCM_CAR (all_labels); | |
4610b011 DH |
1078 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (label, SCM_CDR (all_labels))), |
1079 | s_duplicate_case_label, label, expr); | |
2a6f7afe DH |
1080 | } |
1081 | ||
1082 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1083 | return expr; | |
0f2d19dd JB |
1084 | } |
1085 | ||
1086 | ||
3b88ed2a | 1087 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1088 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1089 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1090 | |
8ea46249 | 1091 | SCM |
609a8b86 | 1092 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1093 | { |
609a8b86 DH |
1094 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1095 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1096 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1097 | ||
1098 | const SCM clauses = SCM_CDR (expr); | |
1099 | SCM clause_idx; | |
1100 | ||
1101 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1102 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1103 | ||
1104 | for (clause_idx = clauses; | |
1105 | !SCM_NULLP (clause_idx); | |
1106 | clause_idx = SCM_CDR (clause_idx)) | |
0f2d19dd | 1107 | { |
609a8b86 DH |
1108 | SCM test; |
1109 | ||
1110 | const SCM clause = SCM_CAR (clause_idx); | |
1111 | const long length = scm_ilength (clause); | |
1112 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1113 | ||
1114 | test = SCM_CAR (clause); | |
1115 | if (SCM_EQ_P (test, scm_sym_else) && else_literal_p) | |
0f2d19dd | 1116 | { |
609a8b86 DH |
1117 | const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx)); |
1118 | ASSERT_SYNTAX_2 (length >= 2, | |
1119 | s_bad_cond_clause, clause, expr); | |
1120 | ASSERT_SYNTAX_2 (last_clause_p, | |
1121 | s_misplaced_else_clause, clause, expr); | |
1122 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1123 | } |
609a8b86 DH |
1124 | else if (length >= 2 |
1125 | && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow) | |
1126 | && arrow_literal_p) | |
1127 | { | |
1128 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1129 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1130 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1131 | } |
0f2d19dd | 1132 | } |
609a8b86 DH |
1133 | |
1134 | SCM_SETCAR (expr, SCM_IM_COND); | |
1135 | return expr; | |
0f2d19dd JB |
1136 | } |
1137 | ||
1cc91f1b | 1138 | |
0f572ba7 DH |
1139 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1140 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1141 | |
9fbee57e DH |
1142 | /* Guile provides an extension to R5RS' define syntax to represent function |
1143 | * currying in a compact way. With this extension, it is allowed to write | |
1144 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1145 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1146 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1147 | * should be either a sequence of zero or more variables, or a sequence of one | |
1148 | * or more variables followed by a space-delimited period and another | |
1149 | * variable. Each level of argument nesting wraps the <body> within another | |
1150 | * lambda expression. For example, the following forms are allowed, each one | |
1151 | * followed by an equivalent, more explicit implementation. | |
1152 | * Example 1: | |
1153 | * (define ((a b . c) . d) <body>) is equivalent to | |
1154 | * (define a (lambda (b . c) (lambda d <body>))) | |
1155 | * Example 2: | |
1156 | * (define (((a) b) c . d) <body>) is equivalent to | |
1157 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1158 | */ | |
1159 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1160 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1161 | static SCM |
1162 | canonicalize_define (const SCM expr) | |
5280aaca | 1163 | { |
cc56ba80 DH |
1164 | SCM body; |
1165 | SCM variable; | |
1166 | ||
1167 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1168 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1169 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1170 | ||
1171 | body = SCM_CDR (cdr_expr); | |
1172 | variable = SCM_CAR (cdr_expr); | |
1173 | while (SCM_CONSP (variable)) | |
5280aaca | 1174 | { |
cc56ba80 DH |
1175 | /* This while loop realizes function currying by variable nesting. |
1176 | * Variable is known to be a nested-variable. In every iteration of the | |
1177 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1178 | * innermost one. Note that we don't check for duplicate formals here: |
1179 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1180 | const SCM formals = SCM_CDR (variable); |
1181 | const SCM tail = scm_cons (formals, body); | |
1182 | ||
1183 | /* Add source properties to each new lambda expression: */ | |
1184 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1185 | ||
1186 | body = scm_list_1 (lambda); | |
1187 | variable = SCM_CAR (variable); | |
5280aaca | 1188 | } |
cc56ba80 DH |
1189 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); |
1190 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
1191 | ||
0f572ba7 DH |
1192 | SCM_SETCAR (cdr_expr, variable); |
1193 | SCM_SETCDR (cdr_expr, body); | |
1194 | return expr; | |
1195 | } | |
1196 | ||
1197 | SCM | |
1198 | scm_m_define (SCM expr, SCM env) | |
1199 | { | |
1200 | SCM canonical_definition; | |
1201 | SCM cdr_canonical_definition; | |
1202 | SCM body; | |
1203 | ||
0f572ba7 DH |
1204 | canonical_definition = canonicalize_define (expr); |
1205 | cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1206 | body = SCM_CDR (cdr_canonical_definition); | |
1207 | ||
9fbee57e | 1208 | if (SCM_TOP_LEVEL (env)) |
0f2d19dd | 1209 | { |
9fbee57e | 1210 | SCM var; |
0f572ba7 | 1211 | const SCM variable = SCM_CAR (cdr_canonical_definition); |
cc56ba80 | 1212 | const SCM value = scm_eval_car (body, env); |
9fbee57e DH |
1213 | if (SCM_REC_PROCNAMES_P) |
1214 | { | |
cc56ba80 | 1215 | SCM tmp = value; |
9fbee57e DH |
1216 | while (SCM_MACROP (tmp)) |
1217 | tmp = SCM_MACRO_CODE (tmp); | |
1218 | if (SCM_CLOSUREP (tmp) | |
1219 | /* Only the first definition determines the name. */ | |
1220 | && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name))) | |
cc56ba80 | 1221 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); |
9fbee57e | 1222 | } |
cc56ba80 DH |
1223 | var = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); |
1224 | SCM_VARIABLE_SET (var, value); | |
9fbee57e | 1225 | return SCM_UNSPECIFIED; |
26d5b9b4 | 1226 | } |
9fbee57e | 1227 | else |
cc56ba80 | 1228 | { |
0f572ba7 DH |
1229 | SCM_SETCAR (canonical_definition, SCM_IM_DEFINE); |
1230 | return canonical_definition; | |
cc56ba80 | 1231 | } |
0f2d19dd JB |
1232 | } |
1233 | ||
1234 | ||
8ae95199 DH |
1235 | /* This is a helper function for forms (<keyword> <expression>) that are |
1236 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1237 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1238 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1239 | static SCM | |
1240 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1241 | { | |
1242 | const SCM cdr_expr = SCM_CDR (expr); | |
1243 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1244 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1245 | ||
1246 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1247 | ||
1248 | return expr; | |
1249 | } | |
1250 | ||
1251 | ||
3b88ed2a | 1252 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1253 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1254 | |
9fbee57e DH |
1255 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1256 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1257 | * the empty list represents the empty parameter list. This representation | |
1258 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1259 | SCM |
8ae95199 | 1260 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1261 | { |
8ae95199 DH |
1262 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1263 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1264 | return new_expr; | |
0f2d19dd JB |
1265 | } |
1266 | ||
8ea46249 | 1267 | |
a954ce1d DH |
1268 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1269 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1270 | ||
302c12b4 | 1271 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1272 | * reversed here. During the evaluation this allows for simple consing of the |
1273 | * results of the inits and steps: | |
302c12b4 | 1274 | |
0f2d19dd | 1275 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1276 | (<var2> <init2>) |
1277 | ... ) | |
1278 | (<test> <return>) | |
1279 | <body>) | |
302c12b4 | 1280 | |
0f2d19dd | 1281 | ;; becomes |
302c12b4 | 1282 | |
e681d187 | 1283 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1284 | (varn ... var2 var1) |
1285 | (<test> <return>) | |
1286 | (<body>) | |
1287 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1288 | */ |
0f2d19dd | 1289 | SCM |
a954ce1d | 1290 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1291 | { |
a954ce1d DH |
1292 | SCM variables = SCM_EOL; |
1293 | SCM init_forms = SCM_EOL; | |
1294 | SCM step_forms = SCM_EOL; | |
1295 | SCM binding_idx; | |
1296 | SCM cddr_expr; | |
1297 | SCM exit_clause; | |
1298 | SCM commands; | |
1299 | SCM tail; | |
1300 | ||
1301 | const SCM cdr_expr = SCM_CDR (expr); | |
1302 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1303 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1304 | ||
1305 | /* Collect variables, init and step forms. */ | |
1306 | binding_idx = SCM_CAR (cdr_expr); | |
1307 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1308 | s_bad_bindings, binding_idx, expr); | |
1309 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1310 | { |
a954ce1d DH |
1311 | const SCM binding = SCM_CAR (binding_idx); |
1312 | const long length = scm_ilength (binding); | |
1313 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1314 | s_bad_binding, binding, expr); | |
1315 | ||
302c12b4 | 1316 | { |
a954ce1d DH |
1317 | const SCM name = SCM_CAR (binding); |
1318 | const SCM init = SCM_CADR (binding); | |
1319 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
1320 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
4610b011 DH |
1321 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, variables)), |
1322 | s_duplicate_binding, name, expr); | |
1323 | ||
a954ce1d DH |
1324 | variables = scm_cons (name, variables); |
1325 | init_forms = scm_cons (init, init_forms); | |
1326 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1327 | } |
0f2d19dd | 1328 | } |
a954ce1d DH |
1329 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1330 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1331 | ||
1332 | /* Memoize the test form and the exit sequence. */ | |
1333 | cddr_expr = SCM_CDR (cdr_expr); | |
1334 | exit_clause = SCM_CAR (cddr_expr); | |
1335 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1336 | s_bad_exit_clause, exit_clause, expr); | |
1337 | ||
1338 | commands = SCM_CDR (cddr_expr); | |
1339 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1340 | tail = scm_cons2 (init_forms, variables, tail); | |
1341 | SCM_SETCAR (expr, SCM_IM_DO); | |
1342 | SCM_SETCDR (expr, tail); | |
1343 | return expr; | |
0f2d19dd JB |
1344 | } |
1345 | ||
b8229a3b | 1346 | |
3b88ed2a | 1347 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1348 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1349 | |
9fbee57e | 1350 | SCM |
4610b011 | 1351 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1352 | { |
4610b011 DH |
1353 | const SCM cdr_expr = SCM_CDR (expr); |
1354 | const long length = scm_ilength (cdr_expr); | |
1355 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1356 | SCM_SETCAR (expr, SCM_IM_IF); | |
1357 | return expr; | |
0f2d19dd JB |
1358 | } |
1359 | ||
302c12b4 | 1360 | |
3b88ed2a | 1361 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1362 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1363 | |
4610b011 DH |
1364 | /* A helper function for memoize_lambda to support checking for duplicate |
1365 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1366 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1367 | * forms that a formal argument can have: | |
1368 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1369 | static int |
4610b011 | 1370 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1371 | { |
9fbee57e DH |
1372 | for (; SCM_CONSP (list); list = SCM_CDR (list)) |
1373 | { | |
1374 | if (SCM_EQ_P (SCM_CAR (list), obj)) | |
4610b011 | 1375 | return 1; |
9fbee57e DH |
1376 | } |
1377 | return SCM_EQ_P (list, obj); | |
5cb22e96 DH |
1378 | } |
1379 | ||
28d52ebb | 1380 | SCM |
03a3e941 | 1381 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1382 | { |
9fbee57e | 1383 | SCM formals; |
03a3e941 | 1384 | SCM formals_idx; |
34adf7ea DH |
1385 | SCM cddr_expr; |
1386 | int documentation; | |
1387 | SCM body; | |
1388 | SCM new_body; | |
03a3e941 DH |
1389 | |
1390 | const SCM cdr_expr = SCM_CDR (expr); | |
1391 | const long length = scm_ilength (cdr_expr); | |
1392 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1393 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1394 | |
03a3e941 DH |
1395 | /* Before iterating the list of formal arguments, make sure the formals |
1396 | * actually are given as either a symbol or a non-cyclic list. */ | |
1397 | formals = SCM_CAR (cdr_expr); | |
1398 | if (SCM_CONSP (formals)) | |
1399 | { | |
1400 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1401 | * detected, report a 'Bad formals' error. */ | |
1402 | } | |
1403 | else | |
1404 | { | |
1405 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formals) || SCM_NULLP (formals), | |
1406 | s_bad_formals, formals, expr); | |
1407 | } | |
1cc91f1b | 1408 | |
03a3e941 DH |
1409 | /* Now iterate the list of formal arguments to check if all formals are |
1410 | * symbols, and that there are no duplicates. */ | |
1411 | formals_idx = formals; | |
1412 | while (SCM_CONSP (formals_idx)) | |
0f2d19dd | 1413 | { |
03a3e941 DH |
1414 | const SCM formal = SCM_CAR (formals_idx); |
1415 | const SCM next_idx = SCM_CDR (formals_idx); | |
1416 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formal), s_bad_formal, formal, expr); | |
1417 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), | |
1418 | s_duplicate_formal, formal, expr); | |
1419 | formals_idx = next_idx; | |
0f2d19dd | 1420 | } |
03a3e941 DH |
1421 | ASSERT_SYNTAX_2 (SCM_NULLP (formals_idx) || SCM_SYMBOLP (formals_idx), |
1422 | s_bad_formal, formals_idx, expr); | |
9fbee57e | 1423 | |
34adf7ea DH |
1424 | /* Memoize the body. Keep a potential documentation string. */ |
1425 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1426 | * some external database. Otherwise it will slow down execution, since | |
1427 | * the documentation string will have to be skipped with every execution | |
1428 | * of the closure. */ | |
1429 | cddr_expr = SCM_CDR (cdr_expr); | |
1430 | documentation = (length >= 3 && SCM_STRINGP (SCM_CAR (cddr_expr))); | |
1431 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; | |
430b8401 | 1432 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1433 | |
1434 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1435 | if (documentation) | |
1436 | SCM_SETCDR (cddr_expr, new_body); | |
1437 | else | |
1438 | SCM_SETCDR (cdr_expr, new_body); | |
1439 | return expr; | |
0f2d19dd | 1440 | } |
6dbd0af5 | 1441 | |
0f2d19dd | 1442 | |
d6754c23 | 1443 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1444 | static void |
d6754c23 | 1445 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1446 | { |
d6754c23 | 1447 | SCM binding_idx; |
302c12b4 | 1448 | |
d6754c23 DH |
1449 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1450 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1451 | |
d6754c23 DH |
1452 | binding_idx = bindings; |
1453 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1454 | { |
d6754c23 DH |
1455 | SCM name; /* const */ |
1456 | ||
1457 | const SCM binding = SCM_CAR (binding_idx); | |
1458 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1459 | s_bad_binding, binding, expr); | |
1460 | ||
1461 | name = SCM_CAR (binding); | |
1462 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
0f2d19dd | 1463 | } |
d6754c23 | 1464 | } |
26d5b9b4 | 1465 | |
d6754c23 DH |
1466 | |
1467 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1468 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1469 | * variables are returned in a list with their order reversed, and the init | |
1470 | * forms are returned in a list in the same order as they are given in the | |
1471 | * bindings. If a duplicate variable name is detected, an error is | |
1472 | * signalled. */ | |
1473 | static void | |
1474 | transform_bindings ( | |
1475 | const SCM bindings, const SCM expr, | |
1476 | SCM *const rvarptr, SCM *const initptr ) | |
1477 | { | |
1478 | SCM rvariables = SCM_EOL; | |
1479 | SCM rinits = SCM_EOL; | |
1480 | SCM binding_idx = bindings; | |
1481 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
1482 | { | |
1483 | const SCM binding = SCM_CAR (binding_idx); | |
1484 | const SCM cdr_binding = SCM_CDR (binding); | |
1485 | const SCM name = SCM_CAR (binding); | |
1486 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, rvariables)), | |
1487 | s_duplicate_binding, name, expr); | |
1488 | rvariables = scm_cons (name, rvariables); | |
1489 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1490 | } | |
1491 | *rvarptr = rvariables; | |
1492 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1493 | } |
1494 | ||
302c12b4 | 1495 | |
3b88ed2a | 1496 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1497 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1498 | |
d6754c23 DH |
1499 | /* This function is a helper function for memoize_let. It transforms |
1500 | * (let name ((var init) ...) body ...) into | |
1501 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1502 | * and memoizes the expression. It is assumed that the caller has checked | |
1503 | * that name is a symbol and that there are bindings and a body. */ | |
1504 | static SCM | |
1505 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1506 | { | |
1507 | SCM rvariables; | |
1508 | SCM variables; | |
1509 | SCM inits; | |
1510 | ||
1511 | const SCM cdr_expr = SCM_CDR (expr); | |
1512 | const SCM name = SCM_CAR (cdr_expr); | |
1513 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1514 | const SCM bindings = SCM_CAR (cddr_expr); | |
1515 | check_bindings (bindings, expr); | |
1516 | ||
1517 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1518 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1519 | ||
1520 | { | |
1521 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1522 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1523 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1524 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1525 | ||
1526 | const SCM rvar = scm_list_1 (name); | |
1527 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1528 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1529 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1530 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1531 | return scm_cons_source (expr, letrec_form, inits); | |
1532 | } | |
1533 | } | |
1534 | ||
1535 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1536 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1537 | SCM |
d6754c23 | 1538 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1539 | { |
d6754c23 DH |
1540 | SCM bindings; |
1541 | ||
1542 | const SCM cdr_expr = SCM_CDR (expr); | |
1543 | const long length = scm_ilength (cdr_expr); | |
1544 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1545 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1546 | |
d6754c23 DH |
1547 | bindings = SCM_CAR (cdr_expr); |
1548 | if (SCM_SYMBOLP (bindings)) | |
26d5b9b4 | 1549 | { |
d6754c23 DH |
1550 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1551 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1552 | } |
d6754c23 DH |
1553 | |
1554 | check_bindings (bindings, expr); | |
1555 | if (SCM_NULLP (bindings) || SCM_NULLP (SCM_CDR (bindings))) | |
26d5b9b4 | 1556 | { |
d6754c23 | 1557 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1558 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1559 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1560 | } |
302c12b4 DH |
1561 | else |
1562 | { | |
d6754c23 DH |
1563 | /* plain let */ |
1564 | SCM rvariables; | |
1565 | SCM inits; | |
1566 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1567 | |
302c12b4 | 1568 | { |
430b8401 | 1569 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1570 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1571 | SCM_SETCAR (expr, SCM_IM_LET); | |
1572 | SCM_SETCDR (expr, new_tail); | |
1573 | return expr; | |
302c12b4 DH |
1574 | } |
1575 | } | |
0f2d19dd JB |
1576 | } |
1577 | ||
1578 | ||
3b88ed2a | 1579 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1580 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1581 | |
d6754c23 DH |
1582 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1583 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1584 | SCM |
d6754c23 | 1585 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1586 | { |
d6754c23 DH |
1587 | SCM binding_idx; |
1588 | SCM new_bindings = SCM_EOL; | |
1589 | SCM new_body; | |
0f2d19dd | 1590 | |
d6754c23 DH |
1591 | const SCM cdr_expr = SCM_CDR (expr); |
1592 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1593 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1594 | |
d6754c23 DH |
1595 | binding_idx = SCM_CAR (cdr_expr); |
1596 | check_bindings (binding_idx, expr); | |
1597 | ||
1598 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
9fbee57e | 1599 | { |
d6754c23 DH |
1600 | const SCM binding = SCM_CAR (binding_idx); |
1601 | const SCM name = SCM_CAR (binding); | |
1602 | const SCM init = SCM_CADR (binding); | |
1603 | new_bindings = scm_cons2 (init, name, new_bindings); | |
9fbee57e | 1604 | } |
d6754c23 | 1605 | new_bindings = scm_reverse_x (new_bindings, SCM_UNDEFINED); |
9fbee57e | 1606 | |
430b8401 | 1607 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
d6754c23 | 1608 | return scm_cons2 (SCM_IM_LETSTAR, new_bindings, new_body); |
9fbee57e | 1609 | } |
b8229a3b | 1610 | |
0f2d19dd | 1611 | |
3b88ed2a | 1612 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); |
9fbee57e | 1613 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); |
1cc91f1b | 1614 | |
0f2d19dd | 1615 | SCM |
d6754c23 | 1616 | scm_m_letrec (SCM expr, SCM env) |
0f2d19dd | 1617 | { |
d6754c23 DH |
1618 | SCM bindings; |
1619 | ||
1620 | const SCM cdr_expr = SCM_CDR (expr); | |
1621 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1622 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1623 | ||
1624 | bindings = SCM_CAR (cdr_expr); | |
1625 | if (SCM_NULLP (bindings)) | |
9fbee57e | 1626 | { |
d6754c23 | 1627 | /* no bindings, let* is executed faster */ |
430b8401 | 1628 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1629 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); |
9fbee57e DH |
1630 | } |
1631 | else | |
1632 | { | |
d6754c23 DH |
1633 | SCM rvariables; |
1634 | SCM inits; | |
1635 | SCM new_body; | |
1636 | ||
1637 | check_bindings (bindings, expr); | |
1638 | transform_bindings (bindings, expr, &rvariables, &inits); | |
430b8401 | 1639 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1640 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); |
9fbee57e | 1641 | } |
0f2d19dd JB |
1642 | } |
1643 | ||
73b64342 | 1644 | |
3b88ed2a | 1645 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1646 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1647 | |
1648 | SCM | |
21628685 | 1649 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1650 | { |
21628685 DH |
1651 | const SCM cdr_expr = SCM_CDR (expr); |
1652 | const long length = scm_ilength (cdr_expr); | |
1653 | ||
1654 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1655 | ||
1656 | if (length == 0) | |
1657 | { | |
1658 | /* Special case: (or) is replaced by #f. */ | |
1659 | return SCM_BOOL_F; | |
1660 | } | |
9fbee57e | 1661 | else |
21628685 DH |
1662 | { |
1663 | SCM_SETCAR (expr, SCM_IM_OR); | |
1664 | return expr; | |
1665 | } | |
73b64342 MD |
1666 | } |
1667 | ||
73b64342 | 1668 | |
9fbee57e DH |
1669 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1670 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
6f81708a DH |
1671 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); |
1672 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
9fbee57e DH |
1673 | |
1674 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1675 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1676 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1677 | * nesting level and is known to be greater than zero. */ | |
1678 | static SCM | |
1679 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1680 | { |
9fbee57e | 1681 | if (SCM_CONSP (form)) |
c96d76b8 | 1682 | { |
21628685 | 1683 | const SCM tmp = SCM_CAR (form); |
9fbee57e DH |
1684 | if (SCM_EQ_P (tmp, scm_sym_quasiquote)) |
1685 | { | |
21628685 DH |
1686 | const SCM args = SCM_CDR (form); |
1687 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1688 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1689 | } | |
1690 | else if (SCM_EQ_P (tmp, scm_sym_unquote)) | |
1691 | { | |
21628685 DH |
1692 | const SCM args = SCM_CDR (form); |
1693 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1694 | if (depth - 1 == 0) |
1695 | return scm_eval_car (args, env); | |
1696 | else | |
1697 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1698 | } | |
1699 | else if (SCM_CONSP (tmp) | |
1700 | && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing)) | |
1701 | { | |
21628685 DH |
1702 | const SCM args = SCM_CDR (tmp); |
1703 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1704 | if (depth - 1 == 0) |
1705 | { | |
21628685 DH |
1706 | const SCM list = scm_eval_car (args, env); |
1707 | const SCM rest = SCM_CDR (form); | |
1708 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1709 | s_splicing, list, form); | |
9fbee57e DH |
1710 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1711 | } | |
1712 | else | |
1713 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1714 | iqq (SCM_CDR (form), env, depth)); | |
1715 | } | |
1716 | else | |
1717 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1718 | iqq (SCM_CDR (form), env, depth)); | |
1719 | } | |
1720 | else if (SCM_VECTORP (form)) | |
c96d76b8 | 1721 | { |
9fbee57e DH |
1722 | size_t i = SCM_VECTOR_LENGTH (form); |
1723 | SCM const *const data = SCM_VELTS (form); | |
1724 | SCM tmp = SCM_EOL; | |
1725 | while (i != 0) | |
1726 | tmp = scm_cons (data[--i], tmp); | |
1727 | scm_remember_upto_here_1 (form); | |
1728 | return scm_vector (iqq (tmp, env, depth)); | |
c96d76b8 | 1729 | } |
9fbee57e DH |
1730 | else |
1731 | return form; | |
1732 | } | |
1733 | ||
1734 | SCM | |
21628685 | 1735 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1736 | { |
21628685 DH |
1737 | const SCM cdr_expr = SCM_CDR (expr); |
1738 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1739 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1740 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1741 | } |
1742 | ||
1743 | ||
3b88ed2a | 1744 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1745 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1746 | ||
1747 | SCM | |
21628685 | 1748 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1749 | { |
21628685 DH |
1750 | SCM quotee; |
1751 | ||
1752 | const SCM cdr_expr = SCM_CDR (expr); | |
1753 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1754 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1755 | quotee = SCM_CAR (cdr_expr); | |
1756 | if (SCM_IMP (quotee) && !SCM_NULLP (quotee)) | |
1757 | return quotee; | |
1758 | else if (SCM_VECTORP (quotee)) | |
1759 | return quotee; | |
1760 | #if 0 | |
1761 | /* The following optimization would be possible if all variable references | |
1762 | * were resolved during memoization: */ | |
1763 | else if (SCM_SYMBOLP (quotee)) | |
1764 | return quotee; | |
1765 | #endif | |
1766 | SCM_SETCAR (expr, SCM_IM_QUOTE); | |
1767 | return expr; | |
9fbee57e DH |
1768 | } |
1769 | ||
1770 | ||
1771 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1772 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1773 | static const char s_set_x[] = "set!"; |
1774 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1775 | ||
1776 | SCM | |
82b3e2c6 | 1777 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1778 | { |
82b3e2c6 DH |
1779 | SCM variable; |
1780 | ||
1781 | const SCM cdr_expr = SCM_CDR (expr); | |
1782 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1783 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1784 | variable = SCM_CAR (cdr_expr); | |
1785 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
1786 | ||
1787 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
1788 | return expr; | |
9fbee57e DH |
1789 | } |
1790 | ||
1791 | ||
1792 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1793 | ||
1794 | ||
3b88ed2a | 1795 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1796 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1797 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1798 | ||
1799 | SCM | |
82b3e2c6 | 1800 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1801 | { |
82b3e2c6 DH |
1802 | const SCM cdr_expr = SCM_CDR (expr); |
1803 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1804 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1805 | |
82b3e2c6 DH |
1806 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1807 | return expr; | |
1808 | } | |
2e171178 | 1809 | |
2e171178 | 1810 | |
3b88ed2a | 1811 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1812 | |
82b3e2c6 DH |
1813 | /* FIXME: The following explanation should go into the documentation: */ |
1814 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1815 | * the global variables named by `var's (symbols, not evaluated), creating | |
1816 | * them if they don't exist, executes body, and then restores the previous | |
1817 | * values of the `var's. Additionally, whenever control leaves body, the | |
1818 | * values of the `var's are saved and restored when control returns. It is an | |
1819 | * error when a symbol appears more than once among the `var's. All `init's | |
1820 | * are evaluated before any `var' is set. | |
1821 | * | |
1822 | * Think of this as `let' for dynamic scope. | |
1823 | */ | |
1824 | ||
1825 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
1826 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
1827 | * | |
1828 | * FIXME - also implement `@bind*'. | |
1829 | */ | |
73b64342 | 1830 | SCM |
82b3e2c6 | 1831 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 1832 | { |
82b3e2c6 DH |
1833 | SCM bindings; |
1834 | SCM rvariables; | |
1835 | SCM inits; | |
1836 | SCM variable_idx; | |
2e171178 | 1837 | |
82b3e2c6 | 1838 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 1839 | |
82b3e2c6 DH |
1840 | const SCM cdr_expr = SCM_CDR (expr); |
1841 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1842 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1843 | bindings = SCM_CAR (cdr_expr); | |
1844 | check_bindings (bindings, expr); | |
1845 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1846 | ||
1847 | for (variable_idx = rvariables; | |
1848 | !SCM_NULLP (variable_idx); | |
1849 | variable_idx = SCM_CDR (variable_idx)) | |
73b64342 | 1850 | { |
82b3e2c6 DH |
1851 | /* The first call to scm_sym2var will look beyond the current module, |
1852 | * while the second call wont. */ | |
1853 | const SCM variable = SCM_CAR (variable_idx); | |
1854 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
1855 | if (SCM_FALSEP (new_variable)) | |
1856 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); | |
1857 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 1858 | } |
82b3e2c6 DH |
1859 | |
1860 | SCM_SETCAR (expr, SCM_IM_BIND); | |
1861 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
1862 | return expr; | |
73b64342 | 1863 | } |
73b64342 | 1864 | |
b0c5d67b | 1865 | |
3b88ed2a | 1866 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
1867 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
1868 | ||
9fbee57e | 1869 | SCM |
da48db62 | 1870 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1871 | { |
da48db62 DH |
1872 | const SCM cdr_expr = SCM_CDR (expr); |
1873 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1874 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1875 | ||
1876 | SCM_SETCAR (expr, SCM_IM_CONT); | |
1877 | return expr; | |
b0c5d67b | 1878 | } |
b0c5d67b DH |
1879 | |
1880 | ||
3b88ed2a | 1881 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 1882 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
1883 | |
1884 | SCM | |
da48db62 | 1885 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1886 | { |
da48db62 DH |
1887 | const SCM cdr_expr = SCM_CDR (expr); |
1888 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1889 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1890 | ||
1891 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
1892 | return expr; | |
b0c5d67b | 1893 | } |
b0c5d67b DH |
1894 | |
1895 | ||
3b88ed2a | 1896 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 1897 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 1898 | |
9fbee57e DH |
1899 | /* Like promises, futures are implemented as closures with an empty |
1900 | * parameter list. Thus, (future <expression>) is transformed into | |
1901 | * (#@future '() <expression>), where the empty list represents the | |
1902 | * empty parameter list. This representation allows for easy creation | |
1903 | * of the closure during evaluation. */ | |
a513ead3 | 1904 | SCM |
8ae95199 | 1905 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 1906 | { |
8ae95199 DH |
1907 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1908 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
1909 | return new_expr; | |
a513ead3 MV |
1910 | } |
1911 | ||
9fbee57e | 1912 | |
3b88ed2a | 1913 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
1914 | SCM_SYMBOL (scm_sym_setter, "setter"); |
1915 | ||
1916 | SCM | |
da48db62 | 1917 | scm_m_generalized_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1918 | { |
da48db62 DH |
1919 | SCM target; |
1920 | ||
1921 | const SCM cdr_expr = SCM_CDR (expr); | |
1922 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1923 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1924 | ||
1925 | target = SCM_CAR (cdr_expr); | |
1926 | if (!SCM_CONSP (target)) | |
1927 | { | |
1928 | /* R5RS usage */ | |
1929 | return scm_m_set_x (expr, env); | |
1930 | } | |
9fbee57e | 1931 | else |
da48db62 DH |
1932 | { |
1933 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
1934 | ||
1935 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
1936 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, setter_proc_tail); | |
1937 | ||
1938 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1939 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), cddr_expr)); | |
1940 | ||
1941 | SCM_SETCAR (expr, setter_proc); | |
1942 | SCM_SETCDR (expr, setter_args); | |
1943 | return expr; | |
1944 | } | |
9fbee57e DH |
1945 | } |
1946 | ||
1947 | ||
a4aa2134 DH |
1948 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
1949 | * soon as the module system allows us to more freely create bindings in | |
1950 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1951 | * moved here. */ | |
9fbee57e | 1952 | SCM |
9a848baf | 1953 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1954 | { |
9a848baf DH |
1955 | SCM slot_nr; |
1956 | ||
1957 | const SCM cdr_expr = SCM_CDR (expr); | |
1958 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1959 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1960 | slot_nr = SCM_CADR (cdr_expr); | |
1961 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
9fbee57e | 1962 | |
9a848baf DH |
1963 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
1964 | return expr; | |
1965 | } | |
9fbee57e | 1966 | |
9fbee57e | 1967 | |
a4aa2134 DH |
1968 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
1969 | * soon as the module system allows us to more freely create bindings in | |
1970 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1971 | * moved here. */ | |
9fbee57e | 1972 | SCM |
9a848baf | 1973 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1974 | { |
9a848baf DH |
1975 | SCM slot_nr; |
1976 | ||
1977 | const SCM cdr_expr = SCM_CDR (expr); | |
1978 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1979 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
1980 | slot_nr = SCM_CADR (cdr_expr); | |
1981 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
1982 | ||
1983 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
1984 | return expr; | |
9fbee57e | 1985 | } |
9fbee57e DH |
1986 | |
1987 | ||
1988 | #if SCM_ENABLE_ELISP | |
1989 | ||
70c1c108 DH |
1990 | static const char s_defun[] = "Symbol's function definition is void"; |
1991 | ||
3b88ed2a | 1992 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 1993 | |
70c1c108 DH |
1994 | /* nil-cond expressions have the form |
1995 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 1996 | SCM |
70c1c108 | 1997 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1998 | { |
70c1c108 DH |
1999 | const long length = scm_ilength (SCM_CDR (expr)); |
2000 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
2001 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
2002 | ||
2003 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
2004 | return expr; | |
9fbee57e DH |
2005 | } |
2006 | ||
2007 | ||
3b88ed2a | 2008 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 2009 | |
70c1c108 DH |
2010 | /* The @fop-macro handles procedure and macro applications for elisp. The |
2011 | * input expression must have the form | |
2012 | * (@fop <var> (transformer-macro <expr> ...)) | |
2013 | * where <var> must be a symbol. The expression is transformed into the | |
2014 | * memoized form of either | |
2015 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
2016 | * if the value of var (across all aliasing) is not a macro, or | |
2017 | * (<un-aliased var> <expr> ...) | |
2018 | * if var is a macro. */ | |
9fbee57e | 2019 | SCM |
70c1c108 | 2020 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 2021 | { |
70c1c108 DH |
2022 | SCM location; |
2023 | SCM symbol; | |
2024 | ||
2025 | const SCM cdr_expr = SCM_CDR (expr); | |
2026 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2027 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
2028 | ||
2029 | symbol = SCM_CAR (cdr_expr); | |
2030 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (symbol), s_bad_variable, symbol, expr); | |
2031 | ||
2032 | location = scm_symbol_fref (symbol); | |
2033 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
2034 | ||
2035 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
2036 | * look up such definitions, the chain of symbol definitions has to be | |
2037 | * followed up to the terminal symbol. */ | |
2038 | while (SCM_SYMBOLP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2039 | { |
70c1c108 DH |
2040 | const SCM alias = SCM_VARIABLE_REF (location); |
2041 | location = scm_symbol_fref (alias); | |
2042 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 2043 | } |
70c1c108 DH |
2044 | |
2045 | /* Memoize the value location belonging to the terminal symbol. */ | |
2046 | SCM_SETCAR (cdr_expr, location); | |
2047 | ||
2048 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 2049 | { |
70c1c108 DH |
2050 | /* Since the location does not contain a macro, the form is a procedure |
2051 | * application. Replace `@fop' by `@apply' and transform the expression | |
2052 | * including the `transformer-macro'. */ | |
2053 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2054 | return expr; | |
2055 | } | |
2056 | else | |
2057 | { | |
2058 | /* Since the location contains a macro, the arguments should not be | |
2059 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2060 | * expression starts with the memoized variable, that is at the cdr of | |
2061 | * the input expression. */ | |
2062 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2063 | return cdr_expr; | |
9fbee57e | 2064 | } |
9fbee57e DH |
2065 | } |
2066 | ||
2067 | #endif /* SCM_ENABLE_ELISP */ | |
2068 | ||
2069 | ||
f58c472a DH |
2070 | /* Start of the memoizers for deprecated macros. */ |
2071 | ||
2072 | ||
2073 | #if (SCM_ENABLE_DEPRECATED == 1) | |
2074 | ||
2075 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2076 | ||
2077 | SCM | |
70c1c108 | 2078 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2079 | { |
70c1c108 DH |
2080 | SCM variable; |
2081 | SCM location; | |
2082 | ||
2083 | const SCM cdr_expr = SCM_CDR (expr); | |
2084 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2085 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2086 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2087 | ||
2088 | variable = SCM_CAR (cdr_expr); | |
2089 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
2090 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); | |
2091 | ASSERT_SYNTAX_2 (!SCM_FALSEP (location) | |
2092 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), | |
2093 | "variable already unbound ", variable, expr); | |
2094 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2095 | return SCM_UNSPECIFIED; |
f58c472a DH |
2096 | } |
2097 | ||
2098 | #endif | |
2099 | ||
2100 | ||
6f81708a DH |
2101 | #if (SCM_ENABLE_DEPRECATED == 1) |
2102 | ||
26d5b9b4 MD |
2103 | SCM |
2104 | scm_macroexp (SCM x, SCM env) | |
2105 | { | |
86d31dfe | 2106 | SCM res, proc, orig_sym; |
26d5b9b4 MD |
2107 | |
2108 | /* Don't bother to produce error messages here. We get them when we | |
2109 | eventually execute the code for real. */ | |
2110 | ||
2111 | macro_tail: | |
86d31dfe MV |
2112 | orig_sym = SCM_CAR (x); |
2113 | if (!SCM_SYMBOLP (orig_sym)) | |
26d5b9b4 MD |
2114 | return x; |
2115 | ||
26d5b9b4 MD |
2116 | { |
2117 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
2118 | if (proc_ptr == NULL) | |
2119 | { | |
2120 | /* We have lost the race. */ | |
2121 | goto macro_tail; | |
2122 | } | |
2123 | proc = *proc_ptr; | |
2124 | } | |
26d5b9b4 MD |
2125 | |
2126 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
2127 | special forms and should not be evaluated here. */ | |
2128 | ||
3b88ed2a DH |
2129 | if (!SCM_MACROP (proc) |
2130 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
26d5b9b4 MD |
2131 | return x; |
2132 | ||
86d31dfe | 2133 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ |
fdc28395 | 2134 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); |
26d5b9b4 MD |
2135 | |
2136 | if (scm_ilength (res) <= 0) | |
8ea46249 | 2137 | res = scm_list_2 (SCM_IM_BEGIN, res); |
26d5b9b4 | 2138 | |
26d5b9b4 MD |
2139 | SCM_DEFER_INTS; |
2140 | SCM_SETCAR (x, SCM_CAR (res)); | |
2141 | SCM_SETCDR (x, SCM_CDR (res)); | |
2142 | SCM_ALLOW_INTS; | |
2143 | ||
2144 | goto macro_tail; | |
2145 | } | |
73b64342 | 2146 | |
6f81708a DH |
2147 | #endif |
2148 | ||
2149 | /*****************************************************************************/ | |
2150 | /*****************************************************************************/ | |
2151 | /* The definitions for unmemoization start here. */ | |
2152 | /*****************************************************************************/ | |
2153 | /*****************************************************************************/ | |
2154 | ||
a44a9715 DH |
2155 | #define SCM_BIT7(x) (127 & SCM_UNPACK (x)) |
2156 | ||
6f81708a | 2157 | SCM_SYMBOL (sym_three_question_marks, "???"); |
a44a9715 | 2158 | |
60a49842 | 2159 | |
6dbd0af5 MD |
2160 | /* scm_unmemocopy takes a memoized expression together with its |
2161 | * environment and rewrites it to its original form. Thus, it is the | |
2162 | * inversion of the rewrite rules above. The procedure is not | |
2163 | * optimized for speed. It's used in scm_iprin1 when printing the | |
220ff1eb MD |
2164 | * code of a closure, in scm_procedure_source, in display_frame when |
2165 | * generating the source for a stackframe in a backtrace, and in | |
2166 | * display_expression. | |
86d31dfe | 2167 | * |
c96d76b8 | 2168 | * Unmemoizing is not a reliable process. You cannot in general |
86d31dfe MV |
2169 | * expect to get the original source back. |
2170 | * | |
2171 | * However, GOOPS currently relies on this for method compilation. | |
2172 | * This ought to change. | |
26d5b9b4 MD |
2173 | */ |
2174 | ||
8ea46249 | 2175 | static SCM |
60a49842 | 2176 | build_binding_list (SCM rnames, SCM rinits) |
8ea46249 DH |
2177 | { |
2178 | SCM bindings = SCM_EOL; | |
60a49842 | 2179 | while (!SCM_NULLP (rnames)) |
8ea46249 | 2180 | { |
60a49842 | 2181 | SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); |
8ea46249 | 2182 | bindings = scm_cons (binding, bindings); |
60a49842 DH |
2183 | rnames = SCM_CDR (rnames); |
2184 | rinits = SCM_CDR (rinits); | |
8ea46249 DH |
2185 | } |
2186 | return bindings; | |
2187 | } | |
2188 | ||
60a49842 | 2189 | |
6f81708a DH |
2190 | static SCM |
2191 | unmemocar (SCM form, SCM env) | |
60a49842 DH |
2192 | { |
2193 | if (!SCM_CONSP (form)) | |
2194 | return form; | |
2195 | else | |
2196 | { | |
2197 | SCM c = SCM_CAR (form); | |
2198 | if (SCM_VARIABLEP (c)) | |
2199 | { | |
2200 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
2201 | if (SCM_FALSEP (sym)) | |
2202 | sym = sym_three_question_marks; | |
2203 | SCM_SETCAR (form, sym); | |
2204 | } | |
2205 | else if (SCM_ILOCP (c)) | |
2206 | { | |
2207 | unsigned long int ir; | |
2208 | ||
2209 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2210 | env = SCM_CDR (env); | |
2211 | env = SCM_CAAR (env); | |
2212 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2213 | env = SCM_CDR (env); | |
2214 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); | |
2215 | } | |
2216 | return form; | |
2217 | } | |
2218 | } | |
2219 | ||
6f81708a DH |
2220 | |
2221 | #if (SCM_ENABLE_DEPRECATED == 1) | |
2222 | ||
2223 | SCM | |
2224 | scm_unmemocar (SCM form, SCM env) | |
2225 | { | |
2226 | return unmemocar (form, env); | |
2227 | } | |
2228 | ||
2229 | #endif | |
2230 | ||
2231 | ||
6dbd0af5 | 2232 | static SCM |
1bbd0b84 | 2233 | unmemocopy (SCM x, SCM env) |
6dbd0af5 MD |
2234 | { |
2235 | SCM ls, z; | |
6dbd0af5 | 2236 | SCM p; |
21628685 DH |
2237 | |
2238 | if (SCM_VECTORP (x)) | |
2239 | { | |
2240 | return scm_list_2 (scm_sym_quote, x); | |
2241 | } | |
2242 | else if (!SCM_CONSP (x)) | |
6dbd0af5 | 2243 | return x; |
21628685 | 2244 | |
6dbd0af5 | 2245 | p = scm_whash_lookup (scm_source_whash, x); |
8ea46249 | 2246 | switch (SCM_ITAG7 (SCM_CAR (x))) |
6dbd0af5 | 2247 | { |
1b43d24c | 2248 | case SCM_BIT7 (SCM_IM_AND): |
2f0d1375 | 2249 | ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED); |
6dbd0af5 | 2250 | break; |
1b43d24c | 2251 | case SCM_BIT7 (SCM_IM_BEGIN): |
2f0d1375 | 2252 | ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED); |
6dbd0af5 | 2253 | break; |
1b43d24c | 2254 | case SCM_BIT7 (SCM_IM_CASE): |
2f0d1375 | 2255 | ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED); |
6dbd0af5 | 2256 | break; |
1b43d24c | 2257 | case SCM_BIT7 (SCM_IM_COND): |
2f0d1375 | 2258 | ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED); |
6dbd0af5 | 2259 | break; |
1b43d24c | 2260 | case SCM_BIT7 (SCM_IM_DO): |
6dbd0af5 | 2261 | { |
e681d187 DH |
2262 | /* format: (#@do (i1 ... ik) (nk nk-1 ...) (test) (body) s1 ... sk), |
2263 | * where ix is an initializer for a local variable, nx is the name of | |
8ea46249 DH |
2264 | * the local variable, test is the test clause of the do loop, body is |
2265 | * the body of the do loop and sx are the step clauses for the local | |
2266 | * variables. */ | |
2267 | SCM names, inits, test, memoized_body, steps, bindings; | |
2268 | ||
6dbd0af5 | 2269 | x = SCM_CDR (x); |
8ea46249 | 2270 | inits = scm_reverse (unmemocopy (SCM_CAR (x), env)); |
e681d187 DH |
2271 | x = SCM_CDR (x); |
2272 | names = SCM_CAR (x); | |
821f18a4 | 2273 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); |
6dbd0af5 | 2274 | x = SCM_CDR (x); |
8ea46249 DH |
2275 | test = unmemocopy (SCM_CAR (x), env); |
2276 | x = SCM_CDR (x); | |
2277 | memoized_body = SCM_CAR (x); | |
2278 | x = SCM_CDR (x); | |
2279 | steps = scm_reverse (unmemocopy (x, env)); | |
2280 | ||
26d5b9b4 | 2281 | /* build transformed binding list */ |
8ea46249 DH |
2282 | bindings = SCM_EOL; |
2283 | while (!SCM_NULLP (names)) | |
6dbd0af5 | 2284 | { |
8ea46249 DH |
2285 | SCM name = SCM_CAR (names); |
2286 | SCM init = SCM_CAR (inits); | |
2287 | SCM step = SCM_CAR (steps); | |
2288 | step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step); | |
2289 | ||
2290 | bindings = scm_cons (scm_cons2 (name, init, step), bindings); | |
2291 | ||
2292 | names = SCM_CDR (names); | |
2293 | inits = SCM_CDR (inits); | |
2294 | steps = SCM_CDR (steps); | |
6dbd0af5 | 2295 | } |
8ea46249 DH |
2296 | z = scm_cons (test, SCM_UNSPECIFIED); |
2297 | ls = scm_cons2 (scm_sym_do, bindings, z); | |
2298 | ||
2299 | x = scm_cons (SCM_BOOL_F, memoized_body); | |
2300 | break; | |
2301 | } | |
1b43d24c | 2302 | case SCM_BIT7 (SCM_IM_IF): |
8ea46249 DH |
2303 | ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED); |
2304 | break; | |
1b43d24c | 2305 | case SCM_BIT7 (SCM_IM_LET): |
8ea46249 DH |
2306 | { |
2307 | /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...), | |
2308 | * where nx is the name of a local variable, ix is an initializer for | |
2309 | * the local variable and by are the body clauses. */ | |
60a49842 | 2310 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2311 | |
2312 | x = SCM_CDR (x); | |
60a49842 | 2313 | rnames = SCM_CAR (x); |
8ea46249 | 2314 | x = SCM_CDR (x); |
60a49842 DH |
2315 | rinits = scm_reverse (unmemocopy (SCM_CAR (x), env)); |
2316 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
8ea46249 | 2317 | |
60a49842 | 2318 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2319 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2320 | ls = scm_cons (scm_sym_let, z); | |
2321 | break; | |
2322 | } | |
1b43d24c | 2323 | case SCM_BIT7 (SCM_IM_LETREC): |
8ea46249 | 2324 | { |
60a49842 DH |
2325 | /* format: (#@letrec (vn ... v2 v1) (i1 i2 ... in) b1 ...), |
2326 | * where vx is the name of a local variable, ix is an initializer for | |
8ea46249 | 2327 | * the local variable and by are the body clauses. */ |
60a49842 | 2328 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2329 | |
2330 | x = SCM_CDR (x); | |
60a49842 DH |
2331 | rnames = SCM_CAR (x); |
2332 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
8ea46249 | 2333 | x = SCM_CDR (x); |
60a49842 | 2334 | rinits = scm_reverse (unmemocopy (SCM_CAR (x), env)); |
8ea46249 | 2335 | |
60a49842 | 2336 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2337 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2338 | ls = scm_cons (scm_sym_letrec, z); | |
6dbd0af5 MD |
2339 | break; |
2340 | } | |
1b43d24c | 2341 | case SCM_BIT7 (SCM_IM_LETSTAR): |
6dbd0af5 MD |
2342 | { |
2343 | SCM b, y; | |
2344 | x = SCM_CDR (x); | |
2345 | b = SCM_CAR (x); | |
2346 | y = SCM_EOL; | |
2347 | if SCM_IMP (b) | |
2348 | { | |
821f18a4 | 2349 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
6dbd0af5 MD |
2350 | goto letstar; |
2351 | } | |
2352 | y = z = scm_acons (SCM_CAR (b), | |
2353 | unmemocar ( | |
8ea46249 | 2354 | scm_cons (unmemocopy (SCM_CADR (b), env), SCM_EOL), env), |
6dbd0af5 | 2355 | SCM_UNSPECIFIED); |
821f18a4 | 2356 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2357 | b = SCM_CDDR (b); |
6dbd0af5 MD |
2358 | if (SCM_IMP (b)) |
2359 | { | |
2360 | SCM_SETCDR (y, SCM_EOL); | |
05b15362 DH |
2361 | z = scm_cons (y, SCM_UNSPECIFIED); |
2362 | ls = scm_cons (scm_sym_let, z); | |
6dbd0af5 MD |
2363 | break; |
2364 | } | |
2365 | do | |
2366 | { | |
a23afe53 MD |
2367 | SCM_SETCDR (z, scm_acons (SCM_CAR (b), |
2368 | unmemocar ( | |
8ea46249 | 2369 | scm_list_1 (unmemocopy (SCM_CADR (b), env)), env), |
a23afe53 MD |
2370 | SCM_UNSPECIFIED)); |
2371 | z = SCM_CDR (z); | |
821f18a4 | 2372 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2373 | b = SCM_CDDR (b); |
6dbd0af5 | 2374 | } |
ff467021 | 2375 | while (SCM_NIMP (b)); |
a23afe53 | 2376 | SCM_SETCDR (z, SCM_EOL); |
6dbd0af5 | 2377 | letstar: |
05b15362 DH |
2378 | z = scm_cons (y, SCM_UNSPECIFIED); |
2379 | ls = scm_cons (scm_sym_letstar, z); | |
6dbd0af5 MD |
2380 | break; |
2381 | } | |
1b43d24c | 2382 | case SCM_BIT7 (SCM_IM_OR): |
2f0d1375 | 2383 | ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED); |
6dbd0af5 | 2384 | break; |
1b43d24c | 2385 | case SCM_BIT7 (SCM_IM_LAMBDA): |
6dbd0af5 | 2386 | x = SCM_CDR (x); |
8ea46249 DH |
2387 | z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED); |
2388 | ls = scm_cons (scm_sym_lambda, z); | |
821f18a4 | 2389 | env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env); |
6dbd0af5 | 2390 | break; |
1b43d24c | 2391 | case SCM_BIT7 (SCM_IM_QUOTE): |
2f0d1375 | 2392 | ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED); |
6dbd0af5 | 2393 | break; |
1b43d24c | 2394 | case SCM_BIT7 (SCM_IM_SET_X): |
89efbff4 | 2395 | ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED); |
6dbd0af5 | 2396 | break; |
1b43d24c | 2397 | case SCM_BIT7 (SCM_MAKISYM (0)): |
6dbd0af5 | 2398 | z = SCM_CAR (x); |
ff467021 | 2399 | switch (SCM_ISYMNUM (z)) |
6dbd0af5 | 2400 | { |
22f2cf2d DH |
2401 | case (SCM_ISYMNUM (SCM_IM_DEFINE)): |
2402 | { | |
2403 | SCM n; | |
2404 | x = SCM_CDR (x); | |
2405 | n = SCM_CAR (x); | |
2406 | z = scm_cons (n, SCM_UNSPECIFIED); | |
2407 | ls = scm_cons (scm_sym_define, z); | |
2408 | if (!SCM_NULLP (env)) | |
2409 | env = scm_cons (scm_cons (scm_cons (n, SCM_CAAR (env)), | |
2410 | SCM_CDAR (env)), | |
2411 | SCM_CDR (env)); | |
2412 | break; | |
2413 | } | |
6dbd0af5 | 2414 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
2f0d1375 | 2415 | ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED); |
6dbd0af5 MD |
2416 | goto loop; |
2417 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
2f0d1375 | 2418 | ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED); |
6dbd0af5 | 2419 | goto loop; |
a570e93a MD |
2420 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
2421 | ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED); | |
2422 | x = SCM_CDR (x); | |
2423 | goto loop; | |
28d52ebb | 2424 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
ebf9b47c | 2425 | ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED); |
28d52ebb MD |
2426 | x = SCM_CDR (x); |
2427 | goto loop; | |
a513ead3 MV |
2428 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
2429 | ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED); | |
2430 | goto loop; | |
2a6f7afe DH |
2431 | case (SCM_ISYMNUM (SCM_IM_ELSE)): |
2432 | ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED); | |
2433 | goto loop; | |
6dbd0af5 | 2434 | default: |
fa888178 | 2435 | /* appease the Sun compiler god: */ ; |
6dbd0af5 | 2436 | } |
6dbd0af5 MD |
2437 | default: |
2438 | ls = z = unmemocar (scm_cons (unmemocopy (SCM_CAR (x), env), | |
2439 | SCM_UNSPECIFIED), | |
2440 | env); | |
2441 | } | |
2442 | loop: | |
8c494e99 DH |
2443 | x = SCM_CDR (x); |
2444 | while (SCM_CONSP (x)) | |
a23afe53 | 2445 | { |
8c494e99 DH |
2446 | SCM form = SCM_CAR (x); |
2447 | if (!SCM_ISYMP (form)) | |
2448 | { | |
2449 | SCM copy = scm_cons (unmemocopy (form, env), SCM_UNSPECIFIED); | |
2450 | SCM_SETCDR (z, unmemocar (copy, env)); | |
2451 | z = SCM_CDR (z); | |
2452 | } | |
609a8b86 DH |
2453 | else if (SCM_EQ_P (form, SCM_IM_ARROW)) |
2454 | { | |
2455 | SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED)); | |
2456 | z = SCM_CDR (z); | |
2457 | } | |
8c494e99 | 2458 | x = SCM_CDR (x); |
a23afe53 MD |
2459 | } |
2460 | SCM_SETCDR (z, x); | |
01f11e02 | 2461 | if (!SCM_FALSEP (p)) |
6dbd0af5 | 2462 | scm_whash_insert (scm_source_whash, ls, p); |
6dbd0af5 MD |
2463 | return ls; |
2464 | } | |
2465 | ||
6dbd0af5 | 2466 | SCM |
6e8d25a6 | 2467 | scm_unmemocopy (SCM x, SCM env) |
6dbd0af5 | 2468 | { |
01f11e02 | 2469 | if (!SCM_NULLP (env)) |
6dbd0af5 MD |
2470 | /* Make a copy of the lowest frame to protect it from |
2471 | modifications by SCM_IM_DEFINE */ | |
2472 | return unmemocopy (x, scm_cons (SCM_CAR (env), SCM_CDR (env))); | |
2473 | else | |
2474 | return unmemocopy (x, env); | |
2475 | } | |
2476 | ||
1cc91f1b | 2477 | |
6f81708a DH |
2478 | /*****************************************************************************/ |
2479 | /*****************************************************************************/ | |
2480 | /* The definitions for execution start here. */ | |
2481 | /*****************************************************************************/ | |
2482 | /*****************************************************************************/ | |
2483 | ||
2484 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); | |
2485 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
2486 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
2487 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
2488 | ||
2489 | /* A function object to implement "apply" for non-closure functions. */ | |
2490 | static SCM f_apply; | |
2491 | /* An endless list consisting of #<undefined> objects: */ | |
2492 | static SCM undefineds; | |
2493 | ||
2494 | ||
2495 | int | |
6e8d25a6 | 2496 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2497 | { |
6a0f6ff3 | 2498 | while (!SCM_NULLP (formals)) |
0f2d19dd | 2499 | { |
01f11e02 | 2500 | if (!SCM_CONSP (formals)) |
ff467021 | 2501 | return 0; |
6a0f6ff3 | 2502 | if (SCM_NULLP (args)) |
ff467021 | 2503 | return 1; |
0f2d19dd JB |
2504 | formals = SCM_CDR (formals); |
2505 | args = SCM_CDR (args); | |
2506 | } | |
01f11e02 | 2507 | return !SCM_NULLP (args) ? 1 : 0; |
0f2d19dd | 2508 | } |
a392ee15 | 2509 | |
0f2d19dd | 2510 | \f |
6dbd0af5 | 2511 | SCM |
6e8d25a6 | 2512 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2513 | { |
680ed4a8 | 2514 | SCM results = SCM_EOL, *lloc = &results, res; |
904a077d | 2515 | while (SCM_CONSP (l)) |
6dbd0af5 | 2516 | { |
680ed4a8 | 2517 | res = EVALCAR (l, env); |
904a077d | 2518 | |
8ea46249 | 2519 | *lloc = scm_list_1 (res); |
a23afe53 | 2520 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2521 | l = SCM_CDR (l); |
2522 | } | |
22a52da1 | 2523 | if (!SCM_NULLP (l)) |
904a077d | 2524 | scm_wrong_num_args (proc); |
680ed4a8 | 2525 | return results; |
6dbd0af5 | 2526 | } |
c4ac4d88 | 2527 | |
d0b07b5d | 2528 | |
9de33deb MD |
2529 | SCM |
2530 | scm_eval_body (SCM code, SCM env) | |
2531 | { | |
2532 | SCM next; | |
2533 | again: | |
01f11e02 DH |
2534 | next = SCM_CDR (code); |
2535 | while (!SCM_NULLP (next)) | |
9de33deb MD |
2536 | { |
2537 | if (SCM_IMP (SCM_CAR (code))) | |
2538 | { | |
2539 | if (SCM_ISYMP (SCM_CAR (code))) | |
2540 | { | |
28d52ebb | 2541 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2542 | /* check for race condition */ |
2543 | if (SCM_ISYMP (SCM_CAR (code))) | |
328dc9a3 | 2544 | code = m_expand_body (code, env); |
28d52ebb | 2545 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2546 | goto again; |
2547 | } | |
2548 | } | |
2549 | else | |
2550 | SCM_XEVAL (SCM_CAR (code), env); | |
2551 | code = next; | |
01f11e02 | 2552 | next = SCM_CDR (code); |
9de33deb MD |
2553 | } |
2554 | return SCM_XEVALCAR (code, env); | |
2555 | } | |
2556 | ||
0f2d19dd JB |
2557 | #endif /* !DEVAL */ |
2558 | ||
6dbd0af5 MD |
2559 | |
2560 | /* SECTION: This code is specific for the debugging support. One | |
2561 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2562 | * defined. | |
2563 | */ | |
2564 | ||
2565 | #ifndef DEVAL | |
2566 | ||
2567 | #define SCM_APPLY scm_apply | |
2568 | #define PREP_APPLY(proc, args) | |
2569 | #define ENTER_APPLY | |
ddea3325 | 2570 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2571 | #ifdef STACK_CHECKING |
2572 | #ifndef NO_CEVAL_STACK_CHECKING | |
2573 | #define EVAL_STACK_CHECKING | |
2574 | #endif | |
6dbd0af5 MD |
2575 | #endif |
2576 | ||
2577 | #else /* !DEVAL */ | |
2578 | ||
0f2d19dd JB |
2579 | #undef SCM_CEVAL |
2580 | #define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */ | |
2581 | #undef SCM_APPLY | |
2582 | #define SCM_APPLY scm_dapply | |
6dbd0af5 MD |
2583 | #undef PREP_APPLY |
2584 | #define PREP_APPLY(p, l) \ | |
2585 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
2586 | #undef ENTER_APPLY | |
2587 | #define ENTER_APPLY \ | |
d3a6bc94 | 2588 | do { \ |
b7ff98dd | 2589 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2590 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2591 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2592 | {\ |
156dcb09 | 2593 | SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2594 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2595 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2596 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2597 | {\ |
c0ab1b8d | 2598 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 2599 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 2600 | }\ |
6dbd0af5 MD |
2601 | else\ |
2602 | {\ | |
5f144b10 GH |
2603 | int first;\ |
2604 | tmp = scm_make_continuation (&first);\ | |
2605 | if (first)\ | |
d95c0b76 | 2606 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 2607 | }\ |
d95c0b76 | 2608 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 2609 | }\ |
d3a6bc94 | 2610 | } while (0) |
0f2d19dd | 2611 | #undef RETURN |
ddea3325 | 2612 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
b7ff98dd MD |
2613 | #ifdef STACK_CHECKING |
2614 | #ifndef EVAL_STACK_CHECKING | |
2615 | #define EVAL_STACK_CHECKING | |
2616 | #endif | |
6dbd0af5 MD |
2617 | #endif |
2618 | ||
2619 | /* scm_ceval_ptr points to the currently selected evaluator. | |
2620 | * *fixme*: Although efficiency is important here, this state variable | |
2621 | * should probably not be a global. It should be related to the | |
2622 | * current repl. | |
2623 | */ | |
2624 | ||
1cc91f1b | 2625 | |
1bbd0b84 | 2626 | SCM (*scm_ceval_ptr) (SCM x, SCM env); |
0f2d19dd | 2627 | |
1646d37b | 2628 | /* scm_last_debug_frame contains a pointer to the last debugging |
6dbd0af5 MD |
2629 | * information stack frame. It is accessed very often from the |
2630 | * debugging evaluator, so it should probably not be indirectly | |
2631 | * addressed. Better to save and restore it from the current root at | |
2632 | * any stack swaps. | |
2633 | */ | |
2634 | ||
6dbd0af5 MD |
2635 | /* scm_debug_eframe_size is the number of slots available for pseudo |
2636 | * stack frames at each real stack frame. | |
2637 | */ | |
2638 | ||
c014a02e | 2639 | long scm_debug_eframe_size; |
6dbd0af5 | 2640 | |
b7ff98dd | 2641 | int scm_debug_mode, scm_check_entry_p, scm_check_apply_p, scm_check_exit_p; |
6dbd0af5 | 2642 | |
c014a02e | 2643 | long scm_eval_stack; |
a74145b8 | 2644 | |
92c2555f | 2645 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 2646 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
2647 | }; |
2648 | ||
92c2555f | 2649 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
2650 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
2651 | "*Flyweight representation of the stack at traps." }, | |
2652 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
2653 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
2654 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
2655 | "Record procedure names at definition." }, | |
2656 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
2657 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 2658 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
2659 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
2660 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 2661 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
2662 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
2663 | "Maximal number of stored backtrace frames." }, | |
2664 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
2665 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
2666 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 2667 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 2668 | { 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 |
2669 | }; |
2670 | ||
92c2555f | 2671 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 2672 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
2673 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
2674 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
2675 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
2676 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
2677 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
2678 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
2679 | }; |
2680 | ||
a1ec6916 | 2681 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 2682 | (SCM setting), |
b3f26b14 MG |
2683 | "Option interface for the evaluation options. Instead of using\n" |
2684 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 2685 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 2686 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
2687 | { |
2688 | SCM ans; | |
2689 | SCM_DEFER_INTS; | |
2690 | ans = scm_options (setting, | |
2691 | scm_eval_opts, | |
2692 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 2693 | FUNC_NAME); |
a74145b8 | 2694 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
2695 | SCM_ALLOW_INTS; |
2696 | return ans; | |
2697 | } | |
1bbd0b84 | 2698 | #undef FUNC_NAME |
33b97402 | 2699 | |
d0b07b5d | 2700 | |
a1ec6916 | 2701 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 2702 | (SCM setting), |
b3f26b14 | 2703 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 2704 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
2705 | { |
2706 | SCM ans; | |
2707 | SCM_DEFER_INTS; | |
2708 | ans = scm_options (setting, | |
2709 | scm_evaluator_trap_table, | |
2710 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 2711 | FUNC_NAME); |
33b97402 | 2712 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 2713 | SCM_ALLOW_INTS; |
33b97402 MD |
2714 | return ans; |
2715 | } | |
1bbd0b84 | 2716 | #undef FUNC_NAME |
33b97402 | 2717 | |
d0b07b5d | 2718 | |
24933780 | 2719 | static SCM |
a392ee15 | 2720 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 2721 | { |
680ed4a8 | 2722 | SCM *results = lloc, res; |
904a077d | 2723 | while (SCM_CONSP (l)) |
0f2d19dd | 2724 | { |
680ed4a8 | 2725 | res = EVALCAR (l, env); |
904a077d | 2726 | |
8ea46249 | 2727 | *lloc = scm_list_1 (res); |
a23afe53 | 2728 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
2729 | l = SCM_CDR (l); |
2730 | } | |
22a52da1 | 2731 | if (!SCM_NULLP (l)) |
904a077d | 2732 | scm_wrong_num_args (proc); |
680ed4a8 | 2733 | return *results; |
0f2d19dd JB |
2734 | } |
2735 | ||
6dbd0af5 MD |
2736 | #endif /* !DEVAL */ |
2737 | ||
2738 | ||
a392ee15 | 2739 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
2740 | */ |
2741 | ||
a392ee15 | 2742 | |
d9d39d76 | 2743 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 2744 | * current module. */ |
d9d39d76 MV |
2745 | #define UPDATE_TOPLEVEL_ENV(env) \ |
2746 | do { \ | |
2747 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 2748 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
2749 | env = scm_top_level_env (p); \ |
2750 | } while (0) | |
2751 | ||
6dbd0af5 | 2752 | |
6f81708a DH |
2753 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
2754 | ASSERT_SYNTAX (!SCM_EQ_P ((x), SCM_EOL), s_empty_combination, x) | |
2755 | ||
2756 | ||
a392ee15 DH |
2757 | /* This is the evaluator. Like any real monster, it has three heads: |
2758 | * | |
2759 | * scm_ceval is the non-debugging evaluator, scm_deval is the debugging | |
2760 | * version. Both are implemented using a common code base, using the | |
2761 | * following mechanism: SCM_CEVAL is a macro, which is either defined to | |
2762 | * scm_ceval or scm_deval. Thus, there is no function SCM_CEVAL, but the code | |
2763 | * for SCM_CEVAL actually compiles to either scm_ceval or scm_deval. When | |
2764 | * SCM_CEVAL is defined to scm_ceval, it is known that the macro DEVAL is not | |
2765 | * defined. When SCM_CEVAL is defined to scm_deval, then the macro DEVAL is | |
2766 | * known to be defined. Thus, in SCM_CEVAL parts for the debugging evaluator | |
2767 | * are enclosed within #ifdef DEVAL ... #endif. | |
2768 | * | |
2769 | * All three (scm_ceval, scm_deval and their common implementation SCM_CEVAL) | |
2770 | * take two input parameters, x and env: x is a single expression to be | |
2771 | * evalutated. env is the environment in which bindings are searched. | |
2772 | * | |
2773 | * x is known to be a cell (i. e. a pair or any other non-immediate). Since x | |
2774 | * is a single expression, it is necessarily in a tail position. If x is just | |
2775 | * a call to another function like in the expression (foo exp1 exp2 ...), the | |
2776 | * realization of that call therefore _must_not_ increase stack usage (the | |
2777 | * evaluation of exp1, exp2 etc., however, may do so). This is realized by | |
2778 | * making extensive use of 'goto' statements within the evaluator: The gotos | |
2779 | * replace recursive calls to SCM_CEVAL, thus re-using the same stack frame | |
2780 | * that SCM_CEVAL was already using. If, however, x represents some form that | |
2781 | * requires to evaluate a sequence of expressions like (begin exp1 exp2 ...), | |
2782 | * then recursive calls to SCM_CEVAL are performed for all but the last | |
2783 | * expression of that sequence. */ | |
6dbd0af5 | 2784 | |
0f2d19dd | 2785 | #if 0 |
0f2d19dd | 2786 | SCM |
1bbd0b84 | 2787 | scm_ceval (SCM x, SCM env) |
0f2d19dd JB |
2788 | {} |
2789 | #endif | |
1cc91f1b | 2790 | |
a392ee15 | 2791 | #if 0 |
0f2d19dd | 2792 | SCM |
1bbd0b84 | 2793 | scm_deval (SCM x, SCM env) |
0f2d19dd JB |
2794 | {} |
2795 | #endif | |
2796 | ||
6dbd0af5 | 2797 | SCM |
1bbd0b84 | 2798 | SCM_CEVAL (SCM x, SCM env) |
0f2d19dd | 2799 | { |
42030fb2 | 2800 | SCM proc, arg1; |
6dbd0af5 | 2801 | #ifdef DEVAL |
92c2555f MV |
2802 | scm_t_debug_frame debug; |
2803 | scm_t_debug_info *debug_info_end; | |
1646d37b | 2804 | debug.prev = scm_last_debug_frame; |
020c890c | 2805 | debug.status = 0; |
04b6c081 | 2806 | /* |
92c2555f | 2807 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
2808 | * user has specified with (debug-set! frames <n>). |
2809 | * | |
2810 | * Even frames are eval frames, odd frames are apply frames. | |
2811 | */ | |
92c2555f | 2812 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 2813 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
2814 | debug.info = debug.vect; |
2815 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
2816 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 2817 | #endif |
b7ff98dd | 2818 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 2819 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 2820 | { |
b7ff98dd | 2821 | #ifdef DEVAL |
6dbd0af5 MD |
2822 | debug.info->e.exp = x; |
2823 | debug.info->e.env = env; | |
b7ff98dd | 2824 | #endif |
6dbd0af5 MD |
2825 | scm_report_stack_overflow (); |
2826 | } | |
2827 | #endif | |
6a0f6ff3 | 2828 | |
6dbd0af5 MD |
2829 | #ifdef DEVAL |
2830 | goto start; | |
2831 | #endif | |
6a0f6ff3 | 2832 | |
6dbd0af5 MD |
2833 | loop: |
2834 | #ifdef DEVAL | |
b7ff98dd MD |
2835 | SCM_CLEAR_ARGSREADY (debug); |
2836 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 2837 | --debug.info; |
04b6c081 MD |
2838 | /* |
2839 | * In theory, this should be the only place where it is necessary to | |
2840 | * check for space in debug.vect since both eval frames and | |
2841 | * available space are even. | |
2842 | * | |
2843 | * For this to be the case, however, it is necessary that primitive | |
2844 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 2845 | * label call PREP_APPLY. |
04b6c081 | 2846 | */ |
c0ab1b8d | 2847 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 2848 | { |
b7ff98dd | 2849 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
2850 | debug.info -= 2; |
2851 | } | |
6a0f6ff3 | 2852 | |
6dbd0af5 MD |
2853 | start: |
2854 | debug.info->e.exp = x; | |
2855 | debug.info->e.env = env; | |
5132eef0 DH |
2856 | if (scm_check_entry_p && SCM_TRAPS_P) |
2857 | { | |
bc76d628 DH |
2858 | if (SCM_ENTER_FRAME_P |
2859 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 2860 | { |
bc76d628 DH |
2861 | SCM stackrep; |
2862 | SCM tail = SCM_BOOL (SCM_TAILRECP (debug)); | |
5132eef0 DH |
2863 | SCM_SET_TAILREC (debug); |
2864 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 2865 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
2866 | else |
2867 | { | |
2868 | int first; | |
2869 | SCM val = scm_make_continuation (&first); | |
2870 | ||
2871 | if (first) | |
bc76d628 | 2872 | stackrep = val; |
5132eef0 DH |
2873 | else |
2874 | { | |
2875 | x = val; | |
2876 | if (SCM_IMP (x)) | |
2877 | RETURN (x); | |
2878 | else | |
2879 | /* This gives the possibility for the debugger to | |
2880 | modify the source expression before evaluation. */ | |
2881 | goto dispatch; | |
2882 | } | |
2883 | } | |
2884 | SCM_TRAPS_P = 0; | |
2885 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
2886 | scm_sym_enter_frame, | |
bc76d628 | 2887 | stackrep, |
5132eef0 DH |
2888 | tail, |
2889 | scm_unmemocopy (x, env)); | |
2890 | SCM_TRAPS_P = 1; | |
2891 | } | |
2892 | } | |
6dbd0af5 | 2893 | #endif |
f8769b1d | 2894 | dispatch: |
9cb5124f | 2895 | SCM_TICK; |
0f2d19dd JB |
2896 | switch (SCM_TYP7 (x)) |
2897 | { | |
1b43d24c | 2898 | case SCM_BIT7 (SCM_IM_AND): |
0f2d19dd | 2899 | x = SCM_CDR (x); |
302c12b4 DH |
2900 | while (!SCM_NULLP (SCM_CDR (x))) |
2901 | { | |
38ace99e DH |
2902 | SCM test_result = EVALCAR (x, env); |
2903 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
0f2d19dd | 2904 | RETURN (SCM_BOOL_F); |
302c12b4 DH |
2905 | else |
2906 | x = SCM_CDR (x); | |
2907 | } | |
6dbd0af5 | 2908 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2909 | goto carloop; |
2910 | ||
1b43d24c | 2911 | case SCM_BIT7 (SCM_IM_BEGIN): |
e050d4f8 DH |
2912 | x = SCM_CDR (x); |
2913 | if (SCM_NULLP (x)) | |
b8113bc8 MV |
2914 | RETURN (SCM_UNSPECIFIED); |
2915 | ||
6dbd0af5 | 2916 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2917 | |
2918 | begin: | |
4163eb72 MV |
2919 | /* If we are on toplevel with a lookup closure, we need to sync |
2920 | with the current module. */ | |
22a52da1 | 2921 | if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env))) |
4163eb72 | 2922 | { |
d9d39d76 | 2923 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2924 | while (!SCM_NULLP (SCM_CDR (x))) |
4163eb72 | 2925 | { |
5280aaca | 2926 | EVALCAR (x, env); |
d9d39d76 | 2927 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2928 | x = SCM_CDR (x); |
4163eb72 | 2929 | } |
5280aaca | 2930 | goto carloop; |
4163eb72 MV |
2931 | } |
2932 | else | |
5280aaca MV |
2933 | goto nontoplevel_begin; |
2934 | ||
5280aaca | 2935 | nontoplevel_begin: |
302c12b4 | 2936 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 2937 | { |
6a0f6ff3 DH |
2938 | SCM form = SCM_CAR (x); |
2939 | if (SCM_IMP (form)) | |
26d5b9b4 | 2940 | { |
6a0f6ff3 | 2941 | if (SCM_ISYMP (form)) |
26d5b9b4 | 2942 | { |
28d52ebb | 2943 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2944 | /* check for race condition */ |
2945 | if (SCM_ISYMP (SCM_CAR (x))) | |
328dc9a3 | 2946 | x = m_expand_body (x, env); |
28d52ebb | 2947 | scm_rec_mutex_unlock (&source_mutex); |
5280aaca | 2948 | goto nontoplevel_begin; |
26d5b9b4 | 2949 | } |
4163eb72 | 2950 | else |
6a0f6ff3 | 2951 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); |
26d5b9b4 | 2952 | } |
5280aaca | 2953 | else |
6a0f6ff3 | 2954 | SCM_CEVAL (form, env); |
302c12b4 | 2955 | x = SCM_CDR (x); |
0f2d19dd | 2956 | } |
5280aaca | 2957 | |
6a0f6ff3 DH |
2958 | carloop: |
2959 | { | |
2960 | /* scm_eval last form in list */ | |
2961 | SCM last_form = SCM_CAR (x); | |
0f2d19dd | 2962 | |
6a0f6ff3 DH |
2963 | if (SCM_CONSP (last_form)) |
2964 | { | |
2965 | /* This is by far the most frequent case. */ | |
2966 | x = last_form; | |
2967 | goto loop; /* tail recurse */ | |
2968 | } | |
2969 | else if (SCM_IMP (last_form)) | |
2970 | RETURN (SCM_EVALIM (last_form, env)); | |
2971 | else if (SCM_VARIABLEP (last_form)) | |
2972 | RETURN (SCM_VARIABLE_REF (last_form)); | |
2973 | else if (SCM_SYMBOLP (last_form)) | |
2974 | RETURN (*scm_lookupcar (x, env, 1)); | |
2975 | else | |
2976 | RETURN (last_form); | |
2977 | } | |
0f2d19dd JB |
2978 | |
2979 | ||
1b43d24c | 2980 | case SCM_BIT7 (SCM_IM_CASE): |
0f2d19dd | 2981 | x = SCM_CDR (x); |
6a0f6ff3 DH |
2982 | { |
2983 | SCM key = EVALCAR (x, env); | |
2984 | x = SCM_CDR (x); | |
2985 | while (!SCM_NULLP (x)) | |
2986 | { | |
2987 | SCM clause = SCM_CAR (x); | |
2988 | SCM labels = SCM_CAR (clause); | |
2a6f7afe | 2989 | if (SCM_EQ_P (labels, SCM_IM_ELSE)) |
6a0f6ff3 DH |
2990 | { |
2991 | x = SCM_CDR (clause); | |
2992 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2993 | goto begin; | |
2994 | } | |
2995 | while (!SCM_NULLP (labels)) | |
2996 | { | |
2997 | SCM label = SCM_CAR (labels); | |
2998 | if (SCM_EQ_P (label, key) || !SCM_FALSEP (scm_eqv_p (label, key))) | |
2999 | { | |
3000 | x = SCM_CDR (clause); | |
3001 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3002 | goto begin; | |
3003 | } | |
3004 | labels = SCM_CDR (labels); | |
3005 | } | |
3006 | x = SCM_CDR (x); | |
3007 | } | |
3008 | } | |
ddea3325 | 3009 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3010 | |
3011 | ||
1b43d24c | 3012 | case SCM_BIT7 (SCM_IM_COND): |
8ea46249 DH |
3013 | x = SCM_CDR (x); |
3014 | while (!SCM_NULLP (x)) | |
0f2d19dd | 3015 | { |
e5cb71a0 | 3016 | SCM clause = SCM_CAR (x); |
609a8b86 | 3017 | if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE)) |
8ea46249 | 3018 | { |
e5cb71a0 | 3019 | x = SCM_CDR (clause); |
8ea46249 DH |
3020 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3021 | goto begin; | |
3022 | } | |
e5cb71a0 | 3023 | else |
0f2d19dd | 3024 | { |
dff98306 DH |
3025 | arg1 = EVALCAR (clause, env); |
3026 | if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1)) | |
6dbd0af5 | 3027 | { |
e5cb71a0 DH |
3028 | x = SCM_CDR (clause); |
3029 | if (SCM_NULLP (x)) | |
dff98306 | 3030 | RETURN (arg1); |
609a8b86 | 3031 | else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW)) |
e5cb71a0 DH |
3032 | { |
3033 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3034 | goto begin; | |
3035 | } | |
3036 | else | |
3037 | { | |
3038 | proc = SCM_CDR (x); | |
3039 | proc = EVALCAR (proc, env); | |
dff98306 | 3040 | PREP_APPLY (proc, scm_list_1 (arg1)); |
e5cb71a0 | 3041 | ENTER_APPLY; |
ddd8f927 | 3042 | goto evap1; |
e5cb71a0 | 3043 | } |
6dbd0af5 | 3044 | } |
e5cb71a0 | 3045 | x = SCM_CDR (x); |
0f2d19dd JB |
3046 | } |
3047 | } | |
ddea3325 | 3048 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3049 | |
3050 | ||
1b43d24c | 3051 | case SCM_BIT7 (SCM_IM_DO): |
0f2d19dd | 3052 | x = SCM_CDR (x); |
e5cb71a0 DH |
3053 | { |
3054 | /* Compute the initialization values and the initial environment. */ | |
e681d187 | 3055 | SCM init_forms = SCM_CAR (x); |
e5cb71a0 DH |
3056 | SCM init_values = SCM_EOL; |
3057 | while (!SCM_NULLP (init_forms)) | |
3058 | { | |
3059 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3060 | init_forms = SCM_CDR (init_forms); | |
3061 | } | |
e681d187 | 3062 | x = SCM_CDR (x); |
821f18a4 | 3063 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
e5cb71a0 | 3064 | } |
e681d187 | 3065 | x = SCM_CDR (x); |
e5cb71a0 DH |
3066 | { |
3067 | SCM test_form = SCM_CAR (x); | |
3068 | SCM body_forms = SCM_CADR (x); | |
3069 | SCM step_forms = SCM_CDDR (x); | |
3070 | ||
3071 | SCM test_result = EVALCAR (test_form, env); | |
3072 | ||
3073 | while (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
3074 | { | |
0f2d19dd | 3075 | { |
e5cb71a0 DH |
3076 | /* Evaluate body forms. */ |
3077 | SCM temp_forms; | |
3078 | for (temp_forms = body_forms; | |
3079 | !SCM_NULLP (temp_forms); | |
3080 | temp_forms = SCM_CDR (temp_forms)) | |
3081 | { | |
3082 | SCM form = SCM_CAR (temp_forms); | |
3083 | /* Dirk:FIXME: We only need to eval forms, that may have a | |
3084 | * side effect here. This is only true for forms that start | |
3085 | * with a pair. All others are just constants. However, | |
3086 | * since in the common case there is no constant expression | |
3087 | * in a body of a do form, we just check for immediates here | |
3088 | * and have SCM_CEVAL take care of other cases. In the long | |
3089 | * run it would make sense to get rid of this test and have | |
3090 | * the macro transformer of 'do' eliminate all forms that | |
3091 | * have no sideeffect. */ | |
3092 | if (!SCM_IMP (form)) | |
3093 | SCM_CEVAL (form, env); | |
3094 | } | |
0f2d19dd | 3095 | } |
e5cb71a0 DH |
3096 | |
3097 | { | |
3098 | /* Evaluate the step expressions. */ | |
3099 | SCM temp_forms; | |
3100 | SCM step_values = SCM_EOL; | |
3101 | for (temp_forms = step_forms; | |
3102 | !SCM_NULLP (temp_forms); | |
3103 | temp_forms = SCM_CDR (temp_forms)) | |
3104 | { | |
3105 | SCM value = EVALCAR (temp_forms, env); | |
3106 | step_values = scm_cons (value, step_values); | |
3107 | } | |
821f18a4 DH |
3108 | env = SCM_EXTEND_ENV (SCM_CAAR (env), |
3109 | step_values, | |
3110 | SCM_CDR (env)); | |
e5cb71a0 DH |
3111 | } |
3112 | ||
3113 | test_result = EVALCAR (test_form, env); | |
3114 | } | |
3115 | } | |
3116 | x = SCM_CDAR (x); | |
0f2d19dd | 3117 | if (SCM_NULLP (x)) |
6dbd0af5 MD |
3118 | RETURN (SCM_UNSPECIFIED); |
3119 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
5280aaca | 3120 | goto nontoplevel_begin; |
0f2d19dd JB |
3121 | |
3122 | ||
1b43d24c | 3123 | case SCM_BIT7 (SCM_IM_IF): |
0f2d19dd | 3124 | x = SCM_CDR (x); |
38ace99e DH |
3125 | { |
3126 | SCM test_result = EVALCAR (x, env); | |
4610b011 DH |
3127 | x = SCM_CDR (x); /* then expression */ |
3128 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
38ace99e | 3129 | { |
4610b011 | 3130 | x = SCM_CDR (x); /* else expression */ |
38ace99e DH |
3131 | if (SCM_NULLP (x)) |
3132 | RETURN (SCM_UNSPECIFIED); | |
3133 | } | |
3134 | } | |
6dbd0af5 | 3135 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3136 | goto carloop; |
3137 | ||
3138 | ||
1b43d24c | 3139 | case SCM_BIT7 (SCM_IM_LET): |
0f2d19dd | 3140 | x = SCM_CDR (x); |
38ace99e DH |
3141 | { |
3142 | SCM init_forms = SCM_CADR (x); | |
3143 | SCM init_values = SCM_EOL; | |
3144 | do | |
3145 | { | |
3146 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3147 | init_forms = SCM_CDR (init_forms); | |
3148 | } | |
3149 | while (!SCM_NULLP (init_forms)); | |
821f18a4 | 3150 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
38ace99e | 3151 | } |
e050d4f8 DH |
3152 | x = SCM_CDDR (x); |
3153 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3154 | goto nontoplevel_begin; | |
0f2d19dd JB |
3155 | |
3156 | ||
1b43d24c | 3157 | case SCM_BIT7 (SCM_IM_LETREC): |
0f2d19dd | 3158 | x = SCM_CDR (x); |
821f18a4 | 3159 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); |
0f2d19dd | 3160 | x = SCM_CDR (x); |
38ace99e DH |
3161 | { |
3162 | SCM init_forms = SCM_CAR (x); | |
3163 | SCM init_values = SCM_EOL; | |
3164 | do | |
3165 | { | |
3166 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3167 | init_forms = SCM_CDR (init_forms); | |
3168 | } | |
3169 | while (!SCM_NULLP (init_forms)); | |
3170 | SCM_SETCDR (SCM_CAR (env), init_values); | |
3171 | } | |
e050d4f8 DH |
3172 | x = SCM_CDR (x); |
3173 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3174 | goto nontoplevel_begin; | |
0f2d19dd JB |
3175 | |
3176 | ||
1b43d24c | 3177 | case SCM_BIT7 (SCM_IM_LETSTAR): |
0f2d19dd | 3178 | x = SCM_CDR (x); |
302c12b4 DH |
3179 | { |
3180 | SCM bindings = SCM_CAR (x); | |
3181 | if (SCM_NULLP (bindings)) | |
821f18a4 | 3182 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
302c12b4 DH |
3183 | else |
3184 | { | |
3185 | do | |
3186 | { | |
3187 | SCM name = SCM_CAR (bindings); | |
3188 | SCM init = SCM_CDR (bindings); | |
821f18a4 | 3189 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); |
302c12b4 DH |
3190 | bindings = SCM_CDR (init); |
3191 | } | |
3192 | while (!SCM_NULLP (bindings)); | |
3193 | } | |
3194 | } | |
e050d4f8 DH |
3195 | x = SCM_CDR (x); |
3196 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3197 | goto nontoplevel_begin; | |
0f2d19dd | 3198 | |
302c12b4 | 3199 | |
1b43d24c | 3200 | case SCM_BIT7 (SCM_IM_OR): |
0f2d19dd | 3201 | x = SCM_CDR (x); |
302c12b4 | 3202 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 3203 | { |
302c12b4 | 3204 | SCM val = EVALCAR (x, env); |
c96d76b8 | 3205 | if (!SCM_FALSEP (val) && !SCM_NILP (val)) |
302c12b4 DH |
3206 | RETURN (val); |
3207 | else | |
3208 | x = SCM_CDR (x); | |
0f2d19dd | 3209 | } |
6dbd0af5 | 3210 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3211 | goto carloop; |
3212 | ||
3213 | ||
1b43d24c | 3214 | case SCM_BIT7 (SCM_IM_LAMBDA): |
0f2d19dd JB |
3215 | RETURN (scm_closure (SCM_CDR (x), env)); |
3216 | ||
3217 | ||
1b43d24c | 3218 | case SCM_BIT7 (SCM_IM_QUOTE): |
8ea46249 | 3219 | RETURN (SCM_CADR (x)); |
0f2d19dd JB |
3220 | |
3221 | ||
1b43d24c | 3222 | case SCM_BIT7 (SCM_IM_SET_X): |
0f2d19dd | 3223 | x = SCM_CDR (x); |
38ace99e DH |
3224 | { |
3225 | SCM *location; | |
3226 | SCM variable = SCM_CAR (x); | |
e050d4f8 | 3227 | if (SCM_ILOCP (variable)) |
38ace99e | 3228 | location = scm_ilookup (variable, env); |
3063e30a | 3229 | else if (SCM_VARIABLEP (variable)) |
e050d4f8 | 3230 | location = SCM_VARIABLE_LOC (variable); |
38ace99e DH |
3231 | else /* (SCM_SYMBOLP (variable)) is known to be true */ |
3232 | location = scm_lookupcar (x, env, 1); | |
3233 | x = SCM_CDR (x); | |
3234 | *location = EVALCAR (x, env); | |
3235 | } | |
0f2d19dd | 3236 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3237 | |
3238 | ||
0f2d19dd | 3239 | /* new syntactic forms go here. */ |
1b43d24c | 3240 | case SCM_BIT7 (SCM_MAKISYM (0)): |
0f2d19dd | 3241 | proc = SCM_CAR (x); |
a392ee15 | 3242 | switch (SCM_ISYMNUM (proc)) |
0f2d19dd | 3243 | { |
3f04400d DH |
3244 | |
3245 | ||
22f2cf2d DH |
3246 | case (SCM_ISYMNUM (SCM_IM_DEFINE)): |
3247 | /* Top level defines are handled directly by the memoizer and thus | |
3248 | * will never generate memoized code with SCM_IM_DEFINE. Internal | |
3249 | * defines which occur at valid positions will be transformed into | |
3250 | * letrec expressions. Thus, whenever the executor detects | |
3251 | * SCM_IM_DEFINE, this must come from an internal definition at an | |
3252 | * illegal position. */ | |
3253 | scm_misc_error (NULL, "Bad define placement", SCM_EOL); | |
3254 | ||
3255 | ||
0f2d19dd | 3256 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
e910e9d2 DH |
3257 | x = SCM_CDR (x); |
3258 | proc = EVALCAR (x, env); | |
3259 | PREP_APPLY (proc, SCM_EOL); | |
3260 | x = SCM_CDR (x); | |
3261 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3262 | |
3263 | apply_proc: | |
3264 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3265 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3266 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3267 | if (SCM_CLOSUREP (proc)) |
3268 | { | |
9a069bdd | 3269 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3270 | #ifdef DEVAL |
9a069bdd | 3271 | debug.info->a.args = arg1; |
6dbd0af5 | 3272 | #endif |
9a069bdd DH |
3273 | if (scm_badargsp (formals, arg1)) |
3274 | scm_wrong_num_args (proc); | |
3275 | ENTER_APPLY; | |
3276 | /* Copy argument list */ | |
3277 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3278 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3279 | else | |
3280 | { | |
3281 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3282 | SCM tail = args; | |
3283 | arg1 = SCM_CDR (arg1); | |
3284 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3285 | { | |
3286 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3287 | SCM_SETCDR (tail, new_tail); | |
3288 | tail = new_tail; | |
3289 | arg1 = SCM_CDR (arg1); | |
3290 | } | |
3291 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3292 | } | |
3293 | ||
3294 | x = SCM_CLOSURE_BODY (proc); | |
3295 | goto nontoplevel_begin; | |
0f2d19dd | 3296 | } |
3f04400d DH |
3297 | else |
3298 | { | |
e910e9d2 DH |
3299 | ENTER_APPLY; |
3300 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3301 | } |
3302 | ||
0f2d19dd JB |
3303 | |
3304 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
5f144b10 GH |
3305 | { |
3306 | int first; | |
3307 | SCM val = scm_make_continuation (&first); | |
3308 | ||
e050d4f8 | 3309 | if (!first) |
5f144b10 | 3310 | RETURN (val); |
e050d4f8 DH |
3311 | else |
3312 | { | |
3313 | arg1 = val; | |
3314 | proc = SCM_CDR (x); | |
3315 | proc = scm_eval_car (proc, env); | |
e050d4f8 DH |
3316 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3317 | ENTER_APPLY; | |
e050d4f8 DH |
3318 | goto evap1; |
3319 | } | |
5f144b10 | 3320 | } |
e050d4f8 | 3321 | |
0f2d19dd | 3322 | |
a570e93a | 3323 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3324 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3325 | |
e050d4f8 | 3326 | |
28d52ebb MD |
3327 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
3328 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); | |
3329 | ||
3330 | ||
c8e1d354 MD |
3331 | /* PLACEHOLDER for case (SCM_ISYMNUM (SCM_IM_DISPATCH)): The |
3332 | following code (type_dispatch) is intended to be the tail | |
3333 | of the case clause for the internal macro | |
3334 | SCM_IM_DISPATCH. Please don't remove it from this | |
3335 | location without discussing it with Mikael | |
3336 | <djurfeldt@nada.kth.se> */ | |
3337 | ||
f12745b6 DH |
3338 | /* The type dispatch code is duplicated below |
3339 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3340 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3341 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3342 | /* Type dispatch means to determine from the types of the function |
3343 | * arguments (i. e. the 'signature' of the call), which method from | |
3344 | * a generic function is to be called. This process of selecting | |
3345 | * the right method takes some time. To speed it up, guile uses | |
3346 | * caching: Together with the macro call to dispatch the signatures | |
3347 | * of some previous calls to that generic function from the same | |
3348 | * place are stored (in the code!) in a cache that we call the | |
3349 | * 'method cache'. This is done since it is likely, that | |
3350 | * consecutive calls to dispatch from that position in the code will | |
3351 | * have the same signature. Thus, the type dispatch works as | |
3352 | * follows: First, determine a hash value from the signature of the | |
3353 | * actual arguments. Second, use this hash value as an index to | |
3354 | * find that same signature in the method cache stored at this | |
3355 | * position in the code. If found, you have also found the | |
3356 | * corresponding method that belongs to that signature. If the | |
3357 | * signature is not found in the method cache, you have to perform a | |
3358 | * full search over all signatures stored with the generic | |
3359 | * function. */ | |
3360 | { | |
3361 | unsigned long int specializers; | |
3362 | unsigned long int hash_value; | |
3363 | unsigned long int cache_end_pos; | |
3364 | unsigned long int mask; | |
3365 | SCM method_cache; | |
3366 | ||
3367 | { | |
3368 | SCM z = SCM_CDDR (x); | |
3369 | SCM tmp = SCM_CADR (z); | |
3370 | specializers = SCM_INUM (SCM_CAR (z)); | |
3371 | ||
3372 | /* Compute a hash value for searching the method cache. There | |
3373 | * are two variants for computing the hash value, a (rather) | |
3374 | * complicated one, and a simple one. For the complicated one | |
3375 | * explained below, tmp holds a number that is used in the | |
3376 | * computation. */ | |
3377 | if (SCM_INUMP (tmp)) | |
3378 | { | |
3379 | /* Use the signature of the actual arguments to determine | |
3380 | * the hash value. This is done as follows: Each class has | |
3381 | * an array of random numbers, that are determined when the | |
3382 | * class is created. The integer 'hashset' is an index into | |
3383 | * that array of random numbers. Now, from all classes that | |
3384 | * are part of the signature of the actual arguments, the | |
3385 | * random numbers at index 'hashset' are taken and summed | |
3386 | * up, giving the hash value. The value of 'hashset' is | |
3387 | * stored at the call to dispatch. This allows to have | |
3388 | * different 'formulas' for calculating the hash value at | |
3389 | * different places where dispatch is called. This allows | |
3390 | * to optimize the hash formula at every individual place | |
3391 | * where dispatch is called, such that hopefully the hash | |
3392 | * value that is computed will directly point to the right | |
3393 | * method in the method cache. */ | |
3394 | unsigned long int hashset = SCM_INUM (tmp); | |
3395 | unsigned long int counter = specializers + 1; | |
dff98306 | 3396 | SCM tmp_arg = arg1; |
f12745b6 DH |
3397 | hash_value = 0; |
3398 | while (!SCM_NULLP (tmp_arg) && counter != 0) | |
61364ba6 | 3399 | { |
f12745b6 DH |
3400 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3401 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3402 | tmp_arg = SCM_CDR (tmp_arg); | |
3403 | counter--; | |
61364ba6 | 3404 | } |
f12745b6 DH |
3405 | z = SCM_CDDR (z); |
3406 | method_cache = SCM_CADR (z); | |
3407 | mask = SCM_INUM (SCM_CAR (z)); | |
3408 | hash_value &= mask; | |
3409 | cache_end_pos = hash_value; | |
3410 | } | |
3411 | else | |
3412 | { | |
3413 | /* This method of determining the hash value is much | |
3414 | * simpler: Set the hash value to zero and just perform a | |
3415 | * linear search through the method cache. */ | |
3416 | method_cache = tmp; | |
3417 | mask = (unsigned long int) ((long) -1); | |
3418 | hash_value = 0; | |
3419 | cache_end_pos = SCM_VECTOR_LENGTH (method_cache); | |
3420 | } | |
3421 | } | |
61364ba6 | 3422 | |
f12745b6 DH |
3423 | { |
3424 | /* Search the method cache for a method with a matching | |
3425 | * signature. Start the search at position 'hash_value'. The | |
3426 | * hashing implementation uses linear probing for conflict | |
3427 | * resolution, that is, if the signature in question is not | |
3428 | * found at the starting index in the hash table, the next table | |
3429 | * entry is tried, and so on, until in the worst case the whole | |
3430 | * cache has been searched, but still the signature has not been | |
3431 | * found. */ | |
3432 | SCM z; | |
3433 | do | |
3434 | { | |
dff98306 | 3435 | SCM args = arg1; /* list of arguments */ |
f12745b6 DH |
3436 | z = SCM_VELTS (method_cache)[hash_value]; |
3437 | while (!SCM_NULLP (args)) | |
61364ba6 MD |
3438 | { |
3439 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 DH |
3440 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
3441 | if (!SCM_EQ_P (class_of_arg, SCM_CAR (z))) | |
61364ba6 | 3442 | goto next_method; |
f12745b6 | 3443 | args = SCM_CDR (args); |
61364ba6 MD |
3444 | z = SCM_CDR (z); |
3445 | } | |
f12745b6 DH |
3446 | /* Fewer arguments than specifiers => CAR != ENV */ |
3447 | if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))) | |
3448 | goto apply_cmethod; | |
3449 | next_method: | |
3450 | hash_value = (hash_value + 1) & mask; | |
3451 | } while (hash_value != cache_end_pos); | |
3452 | ||
3453 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3454 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3455 | |
dff98306 | 3456 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3457 | { |
3458 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3459 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3460 | x = SCM_CMETHOD_BODY (z); |
3461 | goto nontoplevel_begin; | |
3462 | } | |
3463 | } | |
61364ba6 | 3464 | } |
73b64342 | 3465 | |
1d15ecd3 | 3466 | |
ca4be6ea MD |
3467 | case (SCM_ISYMNUM (SCM_IM_SLOT_REF)): |
3468 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3469 | { |
3470 | SCM instance = EVALCAR (x, env); | |
3471 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3472 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); | |
3473 | } | |
3474 | ||
3475 | ||
ca4be6ea MD |
3476 | case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X)): |
3477 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3478 | { |
3479 | SCM instance = EVALCAR (x, env); | |
3480 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3481 | SCM value = EVALCAR (SCM_CDDR (x), env); | |
3482 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3483 | RETURN (SCM_UNSPECIFIED); | |
3484 | } | |
3485 | ||
c96d76b8 | 3486 | |
22721140 | 3487 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3488 | |
73b64342 | 3489 | case (SCM_ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3490 | { |
3491 | SCM test_form = SCM_CDR (x); | |
3492 | x = SCM_CDR (test_form); | |
3493 | while (!SCM_NULL_OR_NIL_P (x)) | |
3494 | { | |
3495 | SCM test_result = EVALCAR (test_form, env); | |
3496 | if (!(SCM_FALSEP (test_result) | |
3497 | || SCM_NULL_OR_NIL_P (test_result))) | |
3498 | { | |
3499 | if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED)) | |
3500 | RETURN (test_result); | |
3501 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3502 | goto carloop; | |
3503 | } | |
3504 | else | |
3505 | { | |
3506 | test_form = SCM_CDR (x); | |
3507 | x = SCM_CDR (test_form); | |
3508 | } | |
3509 | } | |
3510 | x = test_form; | |
3511 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3512 | goto carloop; | |
3513 | } | |
73b64342 | 3514 | |
c96d76b8 | 3515 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 MD |
3516 | |
3517 | case (SCM_ISYMNUM (SCM_IM_BIND)): | |
2e171178 MV |
3518 | { |
3519 | SCM vars, exps, vals; | |
73b64342 | 3520 | |
2e171178 MV |
3521 | x = SCM_CDR (x); |
3522 | vars = SCM_CAAR (x); | |
3523 | exps = SCM_CDAR (x); | |
2e171178 | 3524 | vals = SCM_EOL; |
82b3e2c6 | 3525 | while (!SCM_NULLP (exps)) |
2e171178 MV |
3526 | { |
3527 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3528 | exps = SCM_CDR (exps); | |
3529 | } | |
3530 | ||
3531 | scm_swap_bindings (vars, vals); | |
3532 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3533 | |
3534 | /* Ignore all but the last evaluation result. */ | |
3535 | for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x)) | |
2e171178 | 3536 | { |
1d15ecd3 DH |
3537 | if (SCM_CONSP (SCM_CAR (x))) |
3538 | SCM_CEVAL (SCM_CAR (x), env); | |
2e171178 MV |
3539 | } |
3540 | proc = EVALCAR (x, env); | |
73b64342 | 3541 | |
2e171178 MV |
3542 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3543 | scm_swap_bindings (vars, vals); | |
73b64342 | 3544 | |
ddea3325 | 3545 | RETURN (proc); |
2e171178 | 3546 | } |
c96d76b8 | 3547 | |
1d15ecd3 | 3548 | |
a513ead3 MV |
3549 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
3550 | { | |
9a069bdd DH |
3551 | SCM producer; |
3552 | ||
3553 | x = SCM_CDR (x); | |
3554 | producer = EVALCAR (x, env); | |
3555 | x = SCM_CDR (x); | |
3556 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3557 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3558 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3559 | { |
3560 | /* The list of arguments is not copied. Rather, it is assumed | |
3561 | * that this has been done by the 'values' procedure. */ | |
3562 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3563 | } | |
a513ead3 | 3564 | else |
82b3e2c6 DH |
3565 | { |
3566 | arg1 = scm_list_1 (arg1); | |
3567 | } | |
9a069bdd DH |
3568 | PREP_APPLY (proc, arg1); |
3569 | goto apply_proc; | |
a513ead3 MV |
3570 | } |
3571 | ||
b7798e10 | 3572 | |
0f2d19dd | 3573 | default: |
ddd8f927 | 3574 | goto evapply; |
0f2d19dd JB |
3575 | } |
3576 | ||
89bff2fc | 3577 | |
0f2d19dd JB |
3578 | default: |
3579 | proc = x; | |
ddd8f927 | 3580 | goto evapply; |
82b3e2c6 | 3581 | |
89bff2fc | 3582 | |
0f2d19dd JB |
3583 | case scm_tc7_vector: |
3584 | case scm_tc7_wvect: | |
22721140 | 3585 | #if SCM_HAVE_ARRAYS |
0f2d19dd JB |
3586 | case scm_tc7_bvect: |
3587 | case scm_tc7_byvect: | |
3588 | case scm_tc7_svect: | |
3589 | case scm_tc7_ivect: | |
3590 | case scm_tc7_uvect: | |
3591 | case scm_tc7_fvect: | |
3592 | case scm_tc7_dvect: | |
3593 | case scm_tc7_cvect: | |
3d05f2e0 | 3594 | #if SCM_SIZEOF_LONG_LONG != 0 |
0f2d19dd | 3595 | case scm_tc7_llvect: |
afe5177e | 3596 | #endif |
0f2d19dd | 3597 | #endif |
534c55a9 | 3598 | case scm_tc7_number: |
0f2d19dd | 3599 | case scm_tc7_string: |
0f2d19dd JB |
3600 | case scm_tc7_smob: |
3601 | case scm_tcs_closures: | |
224822be | 3602 | case scm_tc7_cclo: |
89efbff4 | 3603 | case scm_tc7_pws: |
0f2d19dd | 3604 | case scm_tcs_subrs: |
904a077d | 3605 | case scm_tcs_struct: |
0f2d19dd JB |
3606 | RETURN (x); |
3607 | ||
89bff2fc DH |
3608 | case scm_tc7_symbol: |
3609 | /* Only happens when called at top level. */ | |
3610 | x = scm_cons (x, SCM_UNDEFINED); | |
3611 | RETURN (*scm_lookupcar (x, env, 1)); | |
3612 | ||
d22a0ea1 | 3613 | case scm_tc7_variable: |
a130e982 | 3614 | RETURN (SCM_VARIABLE_REF(x)); |
d22a0ea1 | 3615 | |
1b43d24c | 3616 | case SCM_BIT7 (SCM_ILOC00): |
0f2d19dd | 3617 | proc = *scm_ilookup (SCM_CAR (x), env); |
ddd8f927 | 3618 | goto checkmacro; |
b7798e10 | 3619 | |
0f2d19dd | 3620 | case scm_tcs_cons_nimcar: |
e050d4f8 | 3621 | if (SCM_SYMBOLP (SCM_CAR (x))) |
0f2d19dd | 3622 | { |
e050d4f8 | 3623 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3624 | { |
3625 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3626 | if (location == NULL) | |
3627 | { | |
3628 | /* we have lost the race, start again. */ | |
3629 | goto dispatch; | |
3630 | } | |
3631 | proc = *location; | |
3632 | } | |
f8769b1d | 3633 | |
22a52da1 | 3634 | if (SCM_MACROP (proc)) |
0f2d19dd | 3635 | { |
86d31dfe MV |
3636 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3637 | lookupcar */ | |
e050d4f8 | 3638 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3639 | #ifdef DEVAL |
7c354052 MD |
3640 | /* Set a flag during macro expansion so that macro |
3641 | application frames can be deleted from the backtrace. */ | |
3642 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3643 | #endif |
dff98306 | 3644 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
f8769b1d MV |
3645 | scm_cons (env, scm_listofnull)); |
3646 | ||
7c354052 MD |
3647 | #ifdef DEVAL |
3648 | SCM_CLEAR_MACROEXP (debug); | |
3649 | #endif | |
22a52da1 | 3650 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3651 | { |
3b88ed2a | 3652 | case 3: |
0f2d19dd | 3653 | case 2: |
dff98306 DH |
3654 | if (scm_ilength (arg1) <= 0) |
3655 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); | |
6dbd0af5 | 3656 | #ifdef DEVAL |
22a52da1 | 3657 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3658 | { |
6dbd0af5 | 3659 | SCM_DEFER_INTS; |
dff98306 DH |
3660 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3661 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
3662 | SCM_ALLOW_INTS; |
3663 | goto dispatch; | |
3664 | } | |
3665 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
3666 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
3667 | SCM_CAR (x), | |
3668 | SCM_CDR (x)); | |
6dbd0af5 | 3669 | #endif |
0f2d19dd | 3670 | SCM_DEFER_INTS; |
dff98306 DH |
3671 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3672 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 3673 | SCM_ALLOW_INTS; |
680516ba DH |
3674 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3675 | goto loop; | |
3063e30a | 3676 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 3677 | case 1: |
680516ba DH |
3678 | x = arg1; |
3679 | if (SCM_NIMP (x)) | |
3680 | { | |
3681 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3682 | goto loop; | |
3683 | } | |
3684 | else | |
3685 | RETURN (arg1); | |
3063e30a | 3686 | #endif |
0f2d19dd | 3687 | case 0: |
dff98306 | 3688 | RETURN (arg1); |
0f2d19dd JB |
3689 | } |
3690 | } | |
3691 | } | |
3692 | else | |
3693 | proc = SCM_CEVAL (SCM_CAR (x), env); | |
bd987b8e | 3694 | |
ddd8f927 DH |
3695 | checkmacro: |
3696 | if (SCM_MACROP (proc)) | |
0f2d19dd | 3697 | goto handle_a_macro; |
0f2d19dd JB |
3698 | } |
3699 | ||
3700 | ||
e050d4f8 | 3701 | evapply: /* inputs: x, proc */ |
6dbd0af5 MD |
3702 | PREP_APPLY (proc, SCM_EOL); |
3703 | if (SCM_NULLP (SCM_CDR (x))) { | |
3704 | ENTER_APPLY; | |
89efbff4 | 3705 | evap0: |
ddd8f927 | 3706 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
3707 | switch (SCM_TYP7 (proc)) |
3708 | { /* no arguments given */ | |
3709 | case scm_tc7_subr_0: | |
3710 | RETURN (SCM_SUBRF (proc) ()); | |
3711 | case scm_tc7_subr_1o: | |
3712 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
3713 | case scm_tc7_lsubr: | |
3714 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
3715 | case scm_tc7_rpsubr: | |
3716 | RETURN (SCM_BOOL_T); | |
3717 | case scm_tc7_asubr: | |
3718 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 3719 | case scm_tc7_smob: |
68b06924 | 3720 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 3721 | goto badfun; |
68b06924 | 3722 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 3723 | case scm_tc7_cclo: |
dff98306 | 3724 | arg1 = proc; |
0f2d19dd | 3725 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
3726 | #ifdef DEVAL |
3727 | debug.info->a.proc = proc; | |
dff98306 | 3728 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3729 | #endif |
0f2d19dd | 3730 | goto evap1; |
89efbff4 MD |
3731 | case scm_tc7_pws: |
3732 | proc = SCM_PROCEDURE (proc); | |
3733 | #ifdef DEVAL | |
3734 | debug.info->a.proc = proc; | |
3735 | #endif | |
002f1a5d MD |
3736 | if (!SCM_CLOSUREP (proc)) |
3737 | goto evap0; | |
ddd8f927 | 3738 | /* fallthrough */ |
0f2d19dd | 3739 | case scm_tcs_closures: |
ddd8f927 DH |
3740 | { |
3741 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3742 | if (SCM_CONSP (formals)) | |
3743 | goto umwrongnumargs; | |
3744 | x = SCM_CLOSURE_BODY (proc); | |
3745 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3746 | goto nontoplevel_begin; | |
3747 | } | |
904a077d | 3748 | case scm_tcs_struct: |
195847fa MD |
3749 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
3750 | { | |
3751 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 3752 | arg1 = SCM_EOL; |
195847fa MD |
3753 | goto type_dispatch; |
3754 | } | |
2ca0d207 | 3755 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 3756 | { |
dff98306 | 3757 | arg1 = proc; |
195847fa MD |
3758 | proc = (SCM_I_ENTITYP (proc) |
3759 | ? SCM_ENTITY_PROCEDURE (proc) | |
3760 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 3761 | #ifdef DEVAL |
195847fa | 3762 | debug.info->a.proc = proc; |
dff98306 | 3763 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 3764 | #endif |
ddd8f927 | 3765 | goto evap1; |
da7f71d7 | 3766 | } |
2ca0d207 DH |
3767 | else |
3768 | goto badfun; | |
0f2d19dd JB |
3769 | case scm_tc7_subr_1: |
3770 | case scm_tc7_subr_2: | |
3771 | case scm_tc7_subr_2o: | |
14b18ed6 | 3772 | case scm_tc7_dsubr: |
0f2d19dd JB |
3773 | case scm_tc7_cxr: |
3774 | case scm_tc7_subr_3: | |
3775 | case scm_tc7_lsubr_2: | |
3776 | umwrongnumargs: | |
3777 | unmemocar (x, env); | |
f5bf2977 | 3778 | scm_wrong_num_args (proc); |
0f2d19dd | 3779 | default: |
ddd8f927 DH |
3780 | badfun: |
3781 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 3782 | } |
6dbd0af5 | 3783 | } |
0f2d19dd JB |
3784 | |
3785 | /* must handle macros by here */ | |
3786 | x = SCM_CDR (x); | |
dff98306 DH |
3787 | if (SCM_CONSP (x)) |
3788 | arg1 = EVALCAR (x, env); | |
680ed4a8 | 3789 | else |
ab1f1094 | 3790 | scm_wrong_num_args (proc); |
6dbd0af5 | 3791 | #ifdef DEVAL |
dff98306 | 3792 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3793 | #endif |
0f2d19dd | 3794 | x = SCM_CDR (x); |
42030fb2 DH |
3795 | { |
3796 | SCM arg2; | |
3797 | if (SCM_NULLP (x)) | |
3798 | { | |
3799 | ENTER_APPLY; | |
3800 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 3801 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3802 | switch (SCM_TYP7 (proc)) |
3803 | { /* have one argument in arg1 */ | |
3804 | case scm_tc7_subr_2o: | |
3805 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3806 | case scm_tc7_subr_1: | |
3807 | case scm_tc7_subr_1o: | |
3808 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
3809 | case scm_tc7_dsubr: |
3810 | if (SCM_INUMP (arg1)) | |
3811 | { | |
3812 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
3813 | } | |
3814 | else if (SCM_REALP (arg1)) | |
3815 | { | |
3816 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
3817 | } | |
3818 | else if (SCM_BIGP (arg1)) | |
3819 | { | |
3820 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
3821 | } | |
3822 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
3823 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
42030fb2 | 3824 | case scm_tc7_cxr: |
42030fb2 | 3825 | { |
14b18ed6 DH |
3826 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
3827 | do | |
3828 | { | |
3829 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
3830 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
3831 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
3832 | pattern >>= 2; | |
3833 | } while (pattern); | |
42030fb2 | 3834 | RETURN (arg1); |
0f2d19dd | 3835 | } |
42030fb2 DH |
3836 | case scm_tc7_rpsubr: |
3837 | RETURN (SCM_BOOL_T); | |
3838 | case scm_tc7_asubr: | |
3839 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3840 | case scm_tc7_lsubr: | |
0f2d19dd | 3841 | #ifdef DEVAL |
42030fb2 | 3842 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 3843 | #else |
42030fb2 | 3844 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 3845 | #endif |
42030fb2 DH |
3846 | case scm_tc7_smob: |
3847 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3848 | goto badfun; | |
3849 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
3850 | case scm_tc7_cclo: | |
3851 | arg2 = arg1; | |
3852 | arg1 = proc; | |
3853 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 3854 | #ifdef DEVAL |
42030fb2 DH |
3855 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3856 | debug.info->a.proc = proc; | |
6dbd0af5 | 3857 | #endif |
42030fb2 DH |
3858 | goto evap2; |
3859 | case scm_tc7_pws: | |
3860 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 3861 | #ifdef DEVAL |
42030fb2 | 3862 | debug.info->a.proc = proc; |
89efbff4 | 3863 | #endif |
42030fb2 DH |
3864 | if (!SCM_CLOSUREP (proc)) |
3865 | goto evap1; | |
ddd8f927 | 3866 | /* fallthrough */ |
42030fb2 | 3867 | case scm_tcs_closures: |
ddd8f927 DH |
3868 | { |
3869 | /* clos1: */ | |
3870 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3871 | if (SCM_NULLP (formals) | |
3872 | || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals)))) | |
3873 | goto umwrongnumargs; | |
3874 | x = SCM_CLOSURE_BODY (proc); | |
0f2d19dd | 3875 | #ifdef DEVAL |
ddd8f927 DH |
3876 | env = SCM_EXTEND_ENV (formals, |
3877 | debug.info->a.args, | |
3878 | SCM_ENV (proc)); | |
0f2d19dd | 3879 | #else |
ddd8f927 DH |
3880 | env = SCM_EXTEND_ENV (formals, |
3881 | scm_list_1 (arg1), | |
3882 | SCM_ENV (proc)); | |
0f2d19dd | 3883 | #endif |
ddd8f927 DH |
3884 | goto nontoplevel_begin; |
3885 | } | |
42030fb2 DH |
3886 | case scm_tcs_struct: |
3887 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3888 | { | |
3889 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 3890 | #ifdef DEVAL |
42030fb2 | 3891 | arg1 = debug.info->a.args; |
f3d2630a | 3892 | #else |
42030fb2 | 3893 | arg1 = scm_list_1 (arg1); |
f3d2630a | 3894 | #endif |
42030fb2 DH |
3895 | goto type_dispatch; |
3896 | } | |
2ca0d207 | 3897 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3898 | { |
3899 | arg2 = arg1; | |
3900 | arg1 = proc; | |
3901 | proc = (SCM_I_ENTITYP (proc) | |
3902 | ? SCM_ENTITY_PROCEDURE (proc) | |
3903 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 3904 | #ifdef DEVAL |
42030fb2 DH |
3905 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3906 | debug.info->a.proc = proc; | |
0c32d76c | 3907 | #endif |
ddd8f927 | 3908 | goto evap2; |
42030fb2 | 3909 | } |
2ca0d207 DH |
3910 | else |
3911 | goto badfun; | |
42030fb2 DH |
3912 | case scm_tc7_subr_2: |
3913 | case scm_tc7_subr_0: | |
3914 | case scm_tc7_subr_3: | |
3915 | case scm_tc7_lsubr_2: | |
ab1f1094 | 3916 | scm_wrong_num_args (proc); |
42030fb2 DH |
3917 | default: |
3918 | goto badfun; | |
3919 | } | |
3920 | } | |
42030fb2 DH |
3921 | if (SCM_CONSP (x)) |
3922 | arg2 = EVALCAR (x, env); | |
3923 | else | |
ab1f1094 | 3924 | scm_wrong_num_args (proc); |
bd987b8e | 3925 | |
42030fb2 | 3926 | { /* have two or more arguments */ |
6dbd0af5 | 3927 | #ifdef DEVAL |
42030fb2 | 3928 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 3929 | #endif |
42030fb2 DH |
3930 | x = SCM_CDR (x); |
3931 | if (SCM_NULLP (x)) { | |
3932 | ENTER_APPLY; | |
3933 | evap2: | |
ddd8f927 | 3934 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3935 | switch (SCM_TYP7 (proc)) |
3936 | { /* have two arguments */ | |
3937 | case scm_tc7_subr_2: | |
3938 | case scm_tc7_subr_2o: | |
3939 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3940 | case scm_tc7_lsubr: | |
0f2d19dd | 3941 | #ifdef DEVAL |
42030fb2 | 3942 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 3943 | #else |
42030fb2 DH |
3944 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
3945 | #endif | |
3946 | case scm_tc7_lsubr_2: | |
3947 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
3948 | case scm_tc7_rpsubr: | |
3949 | case scm_tc7_asubr: | |
3950 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3951 | case scm_tc7_smob: | |
3952 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3953 | goto badfun; | |
3954 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
3955 | cclon: | |
3956 | case scm_tc7_cclo: | |
0f2d19dd | 3957 | #ifdef DEVAL |
42030fb2 DH |
3958 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3959 | scm_cons (proc, debug.info->a.args), | |
3960 | SCM_EOL)); | |
0f2d19dd | 3961 | #else |
42030fb2 DH |
3962 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3963 | scm_cons2 (proc, arg1, | |
3964 | scm_cons (arg2, | |
3965 | scm_eval_args (x, | |
3966 | env, | |
3967 | proc))), | |
3968 | SCM_EOL)); | |
3969 | #endif | |
3970 | case scm_tcs_struct: | |
3971 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3972 | { | |
3973 | x = SCM_ENTITY_PROCEDURE (proc); | |
3974 | #ifdef DEVAL | |
3975 | arg1 = debug.info->a.args; | |
3976 | #else | |
3977 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 3978 | #endif |
42030fb2 DH |
3979 | goto type_dispatch; |
3980 | } | |
2ca0d207 | 3981 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3982 | { |
3983 | operatorn: | |
f3d2630a | 3984 | #ifdef DEVAL |
42030fb2 DH |
3985 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3986 | ? SCM_ENTITY_PROCEDURE (proc) | |
3987 | : SCM_OPERATOR_PROCEDURE (proc), | |
3988 | scm_cons (proc, debug.info->a.args), | |
3989 | SCM_EOL)); | |
f3d2630a | 3990 | #else |
42030fb2 DH |
3991 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3992 | ? SCM_ENTITY_PROCEDURE (proc) | |
3993 | : SCM_OPERATOR_PROCEDURE (proc), | |
3994 | scm_cons2 (proc, arg1, | |
3995 | scm_cons (arg2, | |
3996 | scm_eval_args (x, | |
3997 | env, | |
3998 | proc))), | |
3999 | SCM_EOL)); | |
f3d2630a | 4000 | #endif |
42030fb2 | 4001 | } |
2ca0d207 DH |
4002 | else |
4003 | goto badfun; | |
42030fb2 | 4004 | case scm_tc7_subr_0: |
14b18ed6 | 4005 | case scm_tc7_dsubr: |
42030fb2 DH |
4006 | case scm_tc7_cxr: |
4007 | case scm_tc7_subr_1o: | |
4008 | case scm_tc7_subr_1: | |
4009 | case scm_tc7_subr_3: | |
ab1f1094 | 4010 | scm_wrong_num_args (proc); |
42030fb2 | 4011 | default: |
9b07e212 | 4012 | goto badfun; |
42030fb2 DH |
4013 | case scm_tc7_pws: |
4014 | proc = SCM_PROCEDURE (proc); | |
4015 | #ifdef DEVAL | |
4016 | debug.info->a.proc = proc; | |
4017 | #endif | |
4018 | if (!SCM_CLOSUREP (proc)) | |
4019 | goto evap2; | |
ddd8f927 | 4020 | /* fallthrough */ |
42030fb2 | 4021 | case scm_tcs_closures: |
ddd8f927 DH |
4022 | { |
4023 | /* clos2: */ | |
4024 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4025 | if (SCM_NULLP (formals) | |
4026 | || (SCM_CONSP (formals) | |
4027 | && (SCM_NULLP (SCM_CDR (formals)) | |
4028 | || (SCM_CONSP (SCM_CDR (formals)) | |
4029 | && SCM_CONSP (SCM_CDDR (formals)))))) | |
4030 | goto umwrongnumargs; | |
0c32d76c | 4031 | #ifdef DEVAL |
ddd8f927 DH |
4032 | env = SCM_EXTEND_ENV (formals, |
4033 | debug.info->a.args, | |
4034 | SCM_ENV (proc)); | |
195847fa | 4035 | #else |
ddd8f927 DH |
4036 | env = SCM_EXTEND_ENV (formals, |
4037 | scm_list_2 (arg1, arg2), | |
4038 | SCM_ENV (proc)); | |
195847fa | 4039 | #endif |
ddd8f927 DH |
4040 | x = SCM_CLOSURE_BODY (proc); |
4041 | goto nontoplevel_begin; | |
4042 | } | |
42030fb2 DH |
4043 | } |
4044 | } | |
42030fb2 | 4045 | if (!SCM_CONSP (x)) |
ab1f1094 | 4046 | scm_wrong_num_args (proc); |
42030fb2 DH |
4047 | #ifdef DEVAL |
4048 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
4049 | deval_args (x, env, proc, | |
4050 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
4051 | #endif | |
4052 | ENTER_APPLY; | |
4053 | evap3: | |
ddd8f927 | 4054 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
4055 | switch (SCM_TYP7 (proc)) |
4056 | { /* have 3 or more arguments */ | |
4057 | #ifdef DEVAL | |
6dbd0af5 | 4058 | case scm_tc7_subr_3: |
ab1f1094 DH |
4059 | if (!SCM_NULLP (SCM_CDR (x))) |
4060 | scm_wrong_num_args (proc); | |
4061 | else | |
4062 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4063 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
4064 | case scm_tc7_asubr: |
4065 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
4066 | arg2 = SCM_CDDR (debug.info->a.args); | |
4067 | do | |
4068 | { | |
4069 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
4070 | arg2 = SCM_CDR (arg2); | |
4071 | } | |
4072 | while (SCM_NIMP (arg2)); | |
4073 | RETURN (arg1); | |
4074 | case scm_tc7_rpsubr: | |
4075 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4076 | RETURN (SCM_BOOL_F); | |
4077 | arg1 = SCM_CDDR (debug.info->a.args); | |
4078 | do | |
4079 | { | |
4080 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) | |
4081 | RETURN (SCM_BOOL_F); | |
4082 | arg2 = SCM_CAR (arg1); | |
4083 | arg1 = SCM_CDR (arg1); | |
4084 | } | |
4085 | while (SCM_NIMP (arg1)); | |
4086 | RETURN (SCM_BOOL_T); | |
4087 | case scm_tc7_lsubr_2: | |
4088 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4089 | SCM_CDDR (debug.info->a.args))); | |
4090 | case scm_tc7_lsubr: | |
4091 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4092 | case scm_tc7_smob: | |
4093 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4094 | goto badfun; | |
4095 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4096 | SCM_CDDR (debug.info->a.args))); | |
4097 | case scm_tc7_cclo: | |
4098 | goto cclon; | |
002f1a5d MD |
4099 | case scm_tc7_pws: |
4100 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4101 | debug.info->a.proc = proc; |
002f1a5d | 4102 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4103 | goto evap3; |
ddd8f927 | 4104 | /* fallthrough */ |
6dbd0af5 | 4105 | case scm_tcs_closures: |
ddd8f927 DH |
4106 | { |
4107 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4108 | if (SCM_NULLP (formals) | |
4109 | || (SCM_CONSP (formals) | |
4110 | && (SCM_NULLP (SCM_CDR (formals)) | |
4111 | || (SCM_CONSP (SCM_CDR (formals)) | |
4112 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4113 | goto umwrongnumargs; | |
4114 | SCM_SET_ARGSREADY (debug); | |
4115 | env = SCM_EXTEND_ENV (formals, | |
4116 | debug.info->a.args, | |
4117 | SCM_ENV (proc)); | |
4118 | x = SCM_CLOSURE_BODY (proc); | |
4119 | goto nontoplevel_begin; | |
4120 | } | |
6dbd0af5 | 4121 | #else /* DEVAL */ |
42030fb2 | 4122 | case scm_tc7_subr_3: |
ab1f1094 DH |
4123 | if (!SCM_NULLP (SCM_CDR (x))) |
4124 | scm_wrong_num_args (proc); | |
4125 | else | |
4126 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4127 | case scm_tc7_asubr: |
4128 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4129 | do | |
4130 | { | |
4131 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4132 | x = SCM_CDR(x); | |
4133 | } | |
4134 | while (SCM_NIMP (x)); | |
4135 | RETURN (arg1); | |
4136 | case scm_tc7_rpsubr: | |
4137 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4138 | RETURN (SCM_BOOL_F); | |
4139 | do | |
4140 | { | |
4141 | arg1 = EVALCAR (x, env); | |
4142 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1))) | |
4143 | RETURN (SCM_BOOL_F); | |
4144 | arg2 = arg1; | |
4145 | x = SCM_CDR (x); | |
4146 | } | |
4147 | while (SCM_NIMP (x)); | |
4148 | RETURN (SCM_BOOL_T); | |
4149 | case scm_tc7_lsubr_2: | |
4150 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4151 | case scm_tc7_lsubr: | |
4152 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4153 | arg2, | |
4154 | scm_eval_args (x, env, proc)))); | |
4155 | case scm_tc7_smob: | |
4156 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4157 | goto badfun; | |
4158 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4159 | scm_eval_args (x, env, proc))); | |
4160 | case scm_tc7_cclo: | |
4161 | goto cclon; | |
4162 | case scm_tc7_pws: | |
4163 | proc = SCM_PROCEDURE (proc); | |
4164 | if (!SCM_CLOSUREP (proc)) | |
4165 | goto evap3; | |
ddd8f927 DH |
4166 | /* fallthrough */ |
4167 | case scm_tcs_closures: | |
da7f71d7 | 4168 | { |
ddd8f927 | 4169 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
42030fb2 DH |
4170 | if (SCM_NULLP (formals) |
4171 | || (SCM_CONSP (formals) | |
4172 | && (SCM_NULLP (SCM_CDR (formals)) | |
4173 | || (SCM_CONSP (SCM_CDR (formals)) | |
4174 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4175 | goto umwrongnumargs; | |
ddd8f927 DH |
4176 | env = SCM_EXTEND_ENV (formals, |
4177 | scm_cons2 (arg1, | |
4178 | arg2, | |
4179 | scm_eval_args (x, env, proc)), | |
4180 | SCM_ENV (proc)); | |
4181 | x = SCM_CLOSURE_BODY (proc); | |
4182 | goto nontoplevel_begin; | |
da7f71d7 | 4183 | } |
0f2d19dd | 4184 | #endif /* DEVAL */ |
42030fb2 DH |
4185 | case scm_tcs_struct: |
4186 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4187 | { | |
f3d2630a | 4188 | #ifdef DEVAL |
42030fb2 | 4189 | arg1 = debug.info->a.args; |
f3d2630a | 4190 | #else |
42030fb2 | 4191 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4192 | #endif |
42030fb2 DH |
4193 | x = SCM_ENTITY_PROCEDURE (proc); |
4194 | goto type_dispatch; | |
4195 | } | |
2ca0d207 | 4196 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4197 | goto operatorn; |
2ca0d207 DH |
4198 | else |
4199 | goto badfun; | |
42030fb2 DH |
4200 | case scm_tc7_subr_2: |
4201 | case scm_tc7_subr_1o: | |
4202 | case scm_tc7_subr_2o: | |
4203 | case scm_tc7_subr_0: | |
14b18ed6 | 4204 | case scm_tc7_dsubr: |
42030fb2 DH |
4205 | case scm_tc7_cxr: |
4206 | case scm_tc7_subr_1: | |
ab1f1094 | 4207 | scm_wrong_num_args (proc); |
42030fb2 | 4208 | default: |
9b07e212 | 4209 | goto badfun; |
42030fb2 DH |
4210 | } |
4211 | } | |
0f2d19dd JB |
4212 | } |
4213 | #ifdef DEVAL | |
6dbd0af5 | 4214 | exit: |
5132eef0 | 4215 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4216 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4217 | { |
b7ff98dd MD |
4218 | SCM_CLEAR_TRACED_FRAME (debug); |
4219 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4220 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4221 | else |
4222 | { | |
5f144b10 GH |
4223 | int first; |
4224 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4225 | |
5f144b10 | 4226 | if (first) |
dff98306 | 4227 | arg1 = val; |
5f144b10 | 4228 | else |
6dbd0af5 | 4229 | { |
5f144b10 | 4230 | proc = val; |
6dbd0af5 MD |
4231 | goto ret; |
4232 | } | |
4233 | } | |
d95c0b76 | 4234 | SCM_TRAPS_P = 0; |
dff98306 | 4235 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4236 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4237 | } |
4238 | ret: | |
1646d37b | 4239 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4240 | return proc; |
4241 | #endif | |
4242 | } | |
4243 | ||
6dbd0af5 MD |
4244 | |
4245 | /* SECTION: This code is compiled once. | |
4246 | */ | |
4247 | ||
0f2d19dd JB |
4248 | #ifndef DEVAL |
4249 | ||
fdc28395 | 4250 | \f |
d0b07b5d | 4251 | |
fdc28395 KN |
4252 | /* Simple procedure calls |
4253 | */ | |
4254 | ||
4255 | SCM | |
4256 | scm_call_0 (SCM proc) | |
4257 | { | |
4258 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4259 | } | |
4260 | ||
4261 | SCM | |
4262 | scm_call_1 (SCM proc, SCM arg1) | |
4263 | { | |
4264 | return scm_apply (proc, arg1, scm_listofnull); | |
4265 | } | |
4266 | ||
4267 | SCM | |
4268 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4269 | { | |
4270 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4271 | } | |
4272 | ||
4273 | SCM | |
4274 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4275 | { | |
4276 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4277 | } | |
4278 | ||
d95c0b76 NJ |
4279 | SCM |
4280 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4281 | { | |
4282 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4283 | scm_cons (arg4, scm_listofnull))); | |
4284 | } | |
4285 | ||
fdc28395 KN |
4286 | /* Simple procedure applies |
4287 | */ | |
4288 | ||
4289 | SCM | |
4290 | scm_apply_0 (SCM proc, SCM args) | |
4291 | { | |
4292 | return scm_apply (proc, args, SCM_EOL); | |
4293 | } | |
4294 | ||
4295 | SCM | |
4296 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4297 | { | |
4298 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4299 | } | |
4300 | ||
4301 | SCM | |
4302 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4303 | { | |
4304 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4305 | } | |
4306 | ||
4307 | SCM | |
4308 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4309 | { | |
4310 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4311 | SCM_EOL); | |
4312 | } | |
4313 | ||
82a2622a | 4314 | /* This code processes the arguments to apply: |
b145c172 JB |
4315 | |
4316 | (apply PROC ARG1 ... ARGS) | |
4317 | ||
82a2622a JB |
4318 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4319 | ... arguments onto the front of ARGS, and returns the resulting | |
4320 | list. Note that ARGS is a list; thus, the argument to this | |
4321 | function is a list whose last element is a list. | |
4322 | ||
4323 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4324 | result. apply:nconc2last takes care of building the list of |
4325 | arguments, given (ARG1 ... ARGS). | |
4326 | ||
82a2622a JB |
4327 | Rather than do new consing, apply:nconc2last destroys its argument. |
4328 | On that topic, this code came into my care with the following | |
4329 | beautifully cryptic comment on that topic: "This will only screw | |
4330 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4331 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4332 | |
3b3b36dd | 4333 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4334 | (SCM lst), |
4335 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4336 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4337 | "@var{args}, and returns the resulting list. Note that\n" | |
4338 | "@var{args} is a list; thus, the argument to this function is\n" | |
4339 | "a list whose last element is a list.\n" | |
4340 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4341 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4342 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4343 | { |
4344 | SCM *lloc; | |
34d19ef6 | 4345 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4346 | lloc = &lst; |
c96d76b8 NJ |
4347 | while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be |
4348 | SCM_NULL_OR_NIL_P, but not | |
4349 | needed in 99.99% of cases, | |
4350 | and it could seriously hurt | |
4351 | performance. - Neil */ | |
a23afe53 | 4352 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4353 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4354 | *lloc = SCM_CAR (*lloc); |
4355 | return lst; | |
4356 | } | |
1bbd0b84 | 4357 | #undef FUNC_NAME |
0f2d19dd JB |
4358 | |
4359 | #endif /* !DEVAL */ | |
4360 | ||
6dbd0af5 MD |
4361 | |
4362 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4363 | * It is compiled twice. | |
4364 | */ | |
4365 | ||
0f2d19dd | 4366 | #if 0 |
0f2d19dd | 4367 | SCM |
6e8d25a6 | 4368 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4369 | {} |
4370 | #endif | |
4371 | ||
4372 | #if 0 | |
0f2d19dd | 4373 | SCM |
6e8d25a6 | 4374 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4375 | {} |
0f2d19dd JB |
4376 | #endif |
4377 | ||
1cc91f1b | 4378 | |
82a2622a JB |
4379 | /* Apply a function to a list of arguments. |
4380 | ||
4381 | This function is exported to the Scheme level as taking two | |
4382 | required arguments and a tail argument, as if it were: | |
4383 | (lambda (proc arg1 . args) ...) | |
4384 | Thus, if you just have a list of arguments to pass to a procedure, | |
4385 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4386 | args, pass the first as ARG1, then cons any remaining fixed args | |
4387 | onto the front of your argument list, and pass that as ARGS. */ | |
4388 | ||
0f2d19dd | 4389 | SCM |
1bbd0b84 | 4390 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4391 | { |
0f2d19dd | 4392 | #ifdef DEVAL |
92c2555f MV |
4393 | scm_t_debug_frame debug; |
4394 | scm_t_debug_info debug_vect_body; | |
1646d37b | 4395 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 4396 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4397 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4398 | debug.vect[0].a.proc = proc; |
4399 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 4400 | scm_last_debug_frame = &debug; |
0f2d19dd | 4401 | #else |
b7ff98dd | 4402 | if (SCM_DEBUGGINGP) |
0f2d19dd | 4403 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4404 | #endif |
4405 | ||
4406 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4407 | |
4408 | /* If ARGS is the empty list, then we're calling apply with only two | |
4409 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4410 | the case, futz with things so that ARG1 is the first argument to | |
4411 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4412 | rest. |
4413 | ||
4414 | Setting the debug apply frame args this way is pretty messy. | |
4415 | Perhaps we should store arg1 and args directly in the frame as | |
4416 | received, and let scm_frame_arguments unpack them, because that's | |
4417 | a relatively rare operation. This works for now; if the Guile | |
4418 | developer archives are still around, see Mikael's post of | |
4419 | 11-Apr-97. */ | |
0f2d19dd JB |
4420 | if (SCM_NULLP (args)) |
4421 | { | |
4422 | if (SCM_NULLP (arg1)) | |
30000774 JB |
4423 | { |
4424 | arg1 = SCM_UNDEFINED; | |
4425 | #ifdef DEVAL | |
4426 | debug.vect[0].a.args = SCM_EOL; | |
4427 | #endif | |
4428 | } | |
0f2d19dd JB |
4429 | else |
4430 | { | |
30000774 JB |
4431 | #ifdef DEVAL |
4432 | debug.vect[0].a.args = arg1; | |
4433 | #endif | |
0f2d19dd JB |
4434 | args = SCM_CDR (arg1); |
4435 | arg1 = SCM_CAR (arg1); | |
4436 | } | |
4437 | } | |
4438 | else | |
4439 | { | |
0f2d19dd | 4440 | args = scm_nconc2last (args); |
30000774 JB |
4441 | #ifdef DEVAL |
4442 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4443 | #endif | |
0f2d19dd | 4444 | } |
0f2d19dd | 4445 | #ifdef DEVAL |
b6d75948 | 4446 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4447 | { |
4448 | SCM tmp; | |
b7ff98dd | 4449 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4450 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4451 | else |
4452 | { | |
5f144b10 GH |
4453 | int first; |
4454 | ||
4455 | tmp = scm_make_continuation (&first); | |
4456 | if (!first) | |
6dbd0af5 MD |
4457 | goto entap; |
4458 | } | |
d95c0b76 NJ |
4459 | SCM_TRAPS_P = 0; |
4460 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4461 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4462 | } |
4463 | entap: | |
4464 | ENTER_APPLY; | |
4465 | #endif | |
6dbd0af5 | 4466 | tail: |
0f2d19dd JB |
4467 | switch (SCM_TYP7 (proc)) |
4468 | { | |
4469 | case scm_tc7_subr_2o: | |
4470 | args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args); | |
ddea3325 | 4471 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4472 | case scm_tc7_subr_2: |
ab1f1094 DH |
4473 | if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args))) |
4474 | scm_wrong_num_args (proc); | |
0f2d19dd | 4475 | args = SCM_CAR (args); |
ddea3325 | 4476 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4477 | case scm_tc7_subr_0: |
ab1f1094 DH |
4478 | if (!SCM_UNBNDP (arg1)) |
4479 | scm_wrong_num_args (proc); | |
4480 | else | |
4481 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4482 | case scm_tc7_subr_1: |
ab1f1094 DH |
4483 | if (SCM_UNBNDP (arg1)) |
4484 | scm_wrong_num_args (proc); | |
0f2d19dd | 4485 | case scm_tc7_subr_1o: |
ab1f1094 DH |
4486 | if (!SCM_NULLP (args)) |
4487 | scm_wrong_num_args (proc); | |
4488 | else | |
4489 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
4490 | case scm_tc7_dsubr: |
4491 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) | |
4492 | scm_wrong_num_args (proc); | |
4493 | if (SCM_INUMP (arg1)) | |
4494 | { | |
4495 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4496 | } | |
4497 | else if (SCM_REALP (arg1)) | |
4498 | { | |
4499 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4500 | } | |
4501 | else if (SCM_BIGP (arg1)) | |
4502 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4503 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
4504 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
0f2d19dd | 4505 | case scm_tc7_cxr: |
ab1f1094 DH |
4506 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) |
4507 | scm_wrong_num_args (proc); | |
0f2d19dd | 4508 | { |
14b18ed6 DH |
4509 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4510 | do | |
4511 | { | |
4512 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4513 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4514 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4515 | pattern >>= 2; | |
4516 | } while (pattern); | |
4517 | RETURN (arg1); | |
0f2d19dd JB |
4518 | } |
4519 | case scm_tc7_subr_3: | |
ab1f1094 DH |
4520 | if (SCM_NULLP (args) |
4521 | || SCM_NULLP (SCM_CDR (args)) | |
4522 | || !SCM_NULLP (SCM_CDDR (args))) | |
4523 | scm_wrong_num_args (proc); | |
4524 | else | |
4525 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4526 | case scm_tc7_lsubr: |
4527 | #ifdef DEVAL | |
ddea3325 | 4528 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4529 | #else |
ddea3325 | 4530 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4531 | #endif |
4532 | case scm_tc7_lsubr_2: | |
ab1f1094 DH |
4533 | if (!SCM_CONSP (args)) |
4534 | scm_wrong_num_args (proc); | |
4535 | else | |
4536 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd JB |
4537 | case scm_tc7_asubr: |
4538 | if (SCM_NULLP (args)) | |
ddea3325 | 4539 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4540 | while (SCM_NIMP (args)) |
4541 | { | |
4542 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4543 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); | |
4544 | args = SCM_CDR (args); | |
4545 | } | |
4546 | RETURN (arg1); | |
4547 | case scm_tc7_rpsubr: | |
4548 | if (SCM_NULLP (args)) | |
4549 | RETURN (SCM_BOOL_T); | |
4550 | while (SCM_NIMP (args)) | |
4551 | { | |
4552 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4553 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) | |
4554 | RETURN (SCM_BOOL_F); | |
4555 | arg1 = SCM_CAR (args); | |
4556 | args = SCM_CDR (args); | |
4557 | } | |
4558 | RETURN (SCM_BOOL_T); | |
4559 | case scm_tcs_closures: | |
4560 | #ifdef DEVAL | |
6dbd0af5 | 4561 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4562 | #else |
4563 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4564 | #endif | |
726d810a | 4565 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4566 | scm_wrong_num_args (proc); |
1609038c MD |
4567 | |
4568 | /* Copy argument list */ | |
4569 | if (SCM_IMP (arg1)) | |
4570 | args = arg1; | |
4571 | else | |
4572 | { | |
4573 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
05b15362 | 4574 | for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4575 | { |
05b15362 | 4576 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4577 | tl = SCM_CDR (tl); |
4578 | } | |
4579 | SCM_SETCDR (tl, arg1); | |
4580 | } | |
4581 | ||
821f18a4 DH |
4582 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4583 | args, | |
4584 | SCM_ENV (proc)); | |
f9450cdb | 4585 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4586 | again: |
05b15362 DH |
4587 | arg1 = SCM_CDR (proc); |
4588 | while (!SCM_NULLP (arg1)) | |
2ddb0920 MD |
4589 | { |
4590 | if (SCM_IMP (SCM_CAR (proc))) | |
4591 | { | |
4592 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4593 | { | |
28d52ebb | 4594 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4595 | /* check for race condition */ |
4596 | if (SCM_ISYMP (SCM_CAR (proc))) | |
328dc9a3 | 4597 | proc = m_expand_body (proc, args); |
28d52ebb | 4598 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4599 | goto again; |
2ddb0920 | 4600 | } |
5280aaca | 4601 | else |
17fa3fcf | 4602 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4603 | } |
4604 | else | |
e791c18f MD |
4605 | SCM_CEVAL (SCM_CAR (proc), args); |
4606 | proc = arg1; | |
05b15362 | 4607 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4608 | } |
e791c18f | 4609 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4610 | case scm_tc7_smob: |
68b06924 | 4611 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4612 | goto badproc; |
afa38f6e | 4613 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4614 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
afa38f6e | 4615 | else if (SCM_NULLP (args)) |
ddea3325 | 4616 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
0717dfd8 | 4617 | else if (SCM_NULLP (SCM_CDR (args))) |
ddea3325 | 4618 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4619 | else |
68b06924 | 4620 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4621 | case scm_tc7_cclo: |
4622 | #ifdef DEVAL | |
6dbd0af5 MD |
4623 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4624 | arg1 = proc; | |
4625 | proc = SCM_CCLO_SUBR (proc); | |
4626 | debug.vect[0].a.proc = proc; | |
4627 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4628 | #else |
4629 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4630 | arg1 = proc; |
4631 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4632 | #endif |
0f2d19dd | 4633 | goto tail; |
89efbff4 MD |
4634 | case scm_tc7_pws: |
4635 | proc = SCM_PROCEDURE (proc); | |
4636 | #ifdef DEVAL | |
4637 | debug.vect[0].a.proc = proc; | |
4638 | #endif | |
4639 | goto tail; | |
904a077d | 4640 | case scm_tcs_struct: |
f3d2630a MD |
4641 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4642 | { | |
4643 | #ifdef DEVAL | |
4644 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4645 | #else | |
4646 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4647 | #endif | |
195847fa | 4648 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4649 | } |
2ca0d207 | 4650 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4651 | { |
504d99c5 | 4652 | /* operator */ |
da7f71d7 MD |
4653 | #ifdef DEVAL |
4654 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4655 | #else | |
4656 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4657 | #endif | |
4658 | arg1 = proc; | |
195847fa MD |
4659 | proc = (SCM_I_ENTITYP (proc) |
4660 | ? SCM_ENTITY_PROCEDURE (proc) | |
4661 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4662 | #ifdef DEVAL |
4663 | debug.vect[0].a.proc = proc; | |
4664 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4665 | #endif | |
195847fa MD |
4666 | if (SCM_NIMP (proc)) |
4667 | goto tail; | |
4668 | else | |
4669 | goto badproc; | |
da7f71d7 | 4670 | } |
2ca0d207 DH |
4671 | else |
4672 | goto badproc; | |
0f2d19dd JB |
4673 | default: |
4674 | badproc: | |
db4b4ca6 | 4675 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
4676 | } |
4677 | #ifdef DEVAL | |
6dbd0af5 | 4678 | exit: |
5132eef0 | 4679 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4680 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4681 | { |
b7ff98dd MD |
4682 | SCM_CLEAR_TRACED_FRAME (debug); |
4683 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 4684 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4685 | else |
4686 | { | |
5f144b10 GH |
4687 | int first; |
4688 | SCM val = scm_make_continuation (&first); | |
4689 | ||
4690 | if (first) | |
4691 | arg1 = val; | |
4692 | else | |
6dbd0af5 | 4693 | { |
5f144b10 | 4694 | proc = val; |
6dbd0af5 MD |
4695 | goto ret; |
4696 | } | |
4697 | } | |
d95c0b76 NJ |
4698 | SCM_TRAPS_P = 0; |
4699 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
4700 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4701 | } |
4702 | ret: | |
1646d37b | 4703 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4704 | return proc; |
4705 | #endif | |
4706 | } | |
4707 | ||
6dbd0af5 MD |
4708 | |
4709 | /* SECTION: The rest of this file is only read once. | |
4710 | */ | |
4711 | ||
0f2d19dd JB |
4712 | #ifndef DEVAL |
4713 | ||
504d99c5 MD |
4714 | /* Trampolines |
4715 | * | |
4716 | * Trampolines make it possible to move procedure application dispatch | |
4717 | * outside inner loops. The motivation was clean implementation of | |
4718 | * efficient replacements of R5RS primitives in SRFI-1. | |
4719 | * | |
4720 | * The semantics is clear: scm_trampoline_N returns an optimized | |
4721 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
4722 | * on N args). | |
4723 | * | |
4724 | * Applying the optimization to map and for-each increased efficiency | |
4725 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
4726 | * before. | |
4727 | */ | |
4728 | ||
756414cf MD |
4729 | static SCM |
4730 | call_subr0_0 (SCM proc) | |
4731 | { | |
4732 | return SCM_SUBRF (proc) (); | |
4733 | } | |
4734 | ||
4735 | static SCM | |
4736 | call_subr1o_0 (SCM proc) | |
4737 | { | |
4738 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
4739 | } | |
4740 | ||
4741 | static SCM | |
4742 | call_lsubr_0 (SCM proc) | |
4743 | { | |
4744 | return SCM_SUBRF (proc) (SCM_EOL); | |
4745 | } | |
4746 | ||
4747 | SCM | |
4748 | scm_i_call_closure_0 (SCM proc) | |
4749 | { | |
6a3f13f0 DH |
4750 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4751 | SCM_EOL, | |
4752 | SCM_ENV (proc)); | |
4753 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4754 | return result; |
756414cf MD |
4755 | } |
4756 | ||
4757 | scm_t_trampoline_0 | |
4758 | scm_trampoline_0 (SCM proc) | |
4759 | { | |
2510c810 DH |
4760 | scm_t_trampoline_0 trampoline; |
4761 | ||
756414cf | 4762 | if (SCM_IMP (proc)) |
d0b07b5d | 4763 | return NULL; |
2510c810 | 4764 | |
756414cf MD |
4765 | switch (SCM_TYP7 (proc)) |
4766 | { | |
4767 | case scm_tc7_subr_0: | |
2510c810 DH |
4768 | trampoline = call_subr0_0; |
4769 | break; | |
756414cf | 4770 | case scm_tc7_subr_1o: |
2510c810 DH |
4771 | trampoline = call_subr1o_0; |
4772 | break; | |
756414cf | 4773 | case scm_tc7_lsubr: |
2510c810 DH |
4774 | trampoline = call_lsubr_0; |
4775 | break; | |
756414cf MD |
4776 | case scm_tcs_closures: |
4777 | { | |
4778 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b | 4779 | if (SCM_NULLP (formals) || !SCM_CONSP (formals)) |
2510c810 | 4780 | trampoline = scm_i_call_closure_0; |
756414cf | 4781 | else |
d0b07b5d | 4782 | return NULL; |
2510c810 | 4783 | break; |
756414cf MD |
4784 | } |
4785 | case scm_tcs_struct: | |
4786 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4787 | trampoline = scm_call_generic_0; |
2ca0d207 | 4788 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4789 | trampoline = scm_call_0; |
4790 | else | |
4791 | return NULL; | |
4792 | break; | |
756414cf MD |
4793 | case scm_tc7_smob: |
4794 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4795 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 4796 | else |
d0b07b5d | 4797 | return NULL; |
2510c810 | 4798 | break; |
756414cf MD |
4799 | case scm_tc7_asubr: |
4800 | case scm_tc7_rpsubr: | |
4801 | case scm_tc7_cclo: | |
4802 | case scm_tc7_pws: | |
2510c810 DH |
4803 | trampoline = scm_call_0; |
4804 | break; | |
756414cf | 4805 | default: |
2510c810 | 4806 | return NULL; /* not applicable on zero arguments */ |
756414cf | 4807 | } |
2510c810 DH |
4808 | /* We only reach this point if a valid trampoline was determined. */ |
4809 | ||
4810 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4811 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
4812 | if (SCM_DEBUGGINGP) | |
4813 | return scm_call_0; | |
4814 | else | |
4815 | return trampoline; | |
756414cf MD |
4816 | } |
4817 | ||
504d99c5 MD |
4818 | static SCM |
4819 | call_subr1_1 (SCM proc, SCM arg1) | |
4820 | { | |
4821 | return SCM_SUBRF (proc) (arg1); | |
4822 | } | |
4823 | ||
9ed24633 MD |
4824 | static SCM |
4825 | call_subr2o_1 (SCM proc, SCM arg1) | |
4826 | { | |
4827 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
4828 | } | |
4829 | ||
504d99c5 MD |
4830 | static SCM |
4831 | call_lsubr_1 (SCM proc, SCM arg1) | |
4832 | { | |
4833 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
4834 | } | |
4835 | ||
4836 | static SCM | |
4837 | call_dsubr_1 (SCM proc, SCM arg1) | |
4838 | { | |
4839 | if (SCM_INUMP (arg1)) | |
4840 | { | |
4841 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4842 | } | |
4843 | else if (SCM_REALP (arg1)) | |
4844 | { | |
4845 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4846 | } | |
504d99c5 MD |
4847 | else if (SCM_BIGP (arg1)) |
4848 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
504d99c5 MD |
4849 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4850 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4851 | } | |
4852 | ||
4853 | static SCM | |
4854 | call_cxr_1 (SCM proc, SCM arg1) | |
4855 | { | |
14b18ed6 DH |
4856 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4857 | do | |
4858 | { | |
4859 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4860 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4861 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4862 | pattern >>= 2; | |
4863 | } while (pattern); | |
4864 | return arg1; | |
504d99c5 MD |
4865 | } |
4866 | ||
4867 | static SCM | |
4868 | call_closure_1 (SCM proc, SCM arg1) | |
4869 | { | |
6a3f13f0 DH |
4870 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4871 | scm_list_1 (arg1), | |
4872 | SCM_ENV (proc)); | |
4873 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4874 | return result; |
504d99c5 MD |
4875 | } |
4876 | ||
4877 | scm_t_trampoline_1 | |
4878 | scm_trampoline_1 (SCM proc) | |
4879 | { | |
2510c810 DH |
4880 | scm_t_trampoline_1 trampoline; |
4881 | ||
504d99c5 | 4882 | if (SCM_IMP (proc)) |
d0b07b5d | 4883 | return NULL; |
2510c810 | 4884 | |
504d99c5 MD |
4885 | switch (SCM_TYP7 (proc)) |
4886 | { | |
4887 | case scm_tc7_subr_1: | |
4888 | case scm_tc7_subr_1o: | |
2510c810 DH |
4889 | trampoline = call_subr1_1; |
4890 | break; | |
9ed24633 | 4891 | case scm_tc7_subr_2o: |
2510c810 DH |
4892 | trampoline = call_subr2o_1; |
4893 | break; | |
504d99c5 | 4894 | case scm_tc7_lsubr: |
2510c810 DH |
4895 | trampoline = call_lsubr_1; |
4896 | break; | |
14b18ed6 | 4897 | case scm_tc7_dsubr: |
2510c810 DH |
4898 | trampoline = call_dsubr_1; |
4899 | break; | |
504d99c5 | 4900 | case scm_tc7_cxr: |
2510c810 DH |
4901 | trampoline = call_cxr_1; |
4902 | break; | |
504d99c5 MD |
4903 | case scm_tcs_closures: |
4904 | { | |
4905 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4906 | if (!SCM_NULLP (formals) |
4907 | && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals)))) | |
2510c810 | 4908 | trampoline = call_closure_1; |
504d99c5 | 4909 | else |
d0b07b5d | 4910 | return NULL; |
2510c810 | 4911 | break; |
504d99c5 MD |
4912 | } |
4913 | case scm_tcs_struct: | |
4914 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4915 | trampoline = scm_call_generic_1; |
2ca0d207 | 4916 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4917 | trampoline = scm_call_1; |
4918 | else | |
4919 | return NULL; | |
4920 | break; | |
504d99c5 MD |
4921 | case scm_tc7_smob: |
4922 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4923 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 4924 | else |
d0b07b5d | 4925 | return NULL; |
2510c810 | 4926 | break; |
504d99c5 MD |
4927 | case scm_tc7_asubr: |
4928 | case scm_tc7_rpsubr: | |
4929 | case scm_tc7_cclo: | |
4930 | case scm_tc7_pws: | |
2510c810 DH |
4931 | trampoline = scm_call_1; |
4932 | break; | |
504d99c5 | 4933 | default: |
d0b07b5d | 4934 | return NULL; /* not applicable on one arg */ |
504d99c5 | 4935 | } |
2510c810 DH |
4936 | /* We only reach this point if a valid trampoline was determined. */ |
4937 | ||
4938 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4939 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
4940 | if (SCM_DEBUGGINGP) | |
4941 | return scm_call_1; | |
4942 | else | |
4943 | return trampoline; | |
504d99c5 MD |
4944 | } |
4945 | ||
4946 | static SCM | |
4947 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4948 | { | |
4949 | return SCM_SUBRF (proc) (arg1, arg2); | |
4950 | } | |
4951 | ||
9ed24633 MD |
4952 | static SCM |
4953 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4954 | { | |
4955 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
4956 | } | |
4957 | ||
504d99c5 MD |
4958 | static SCM |
4959 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
4960 | { | |
4961 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
4962 | } | |
4963 | ||
4964 | static SCM | |
4965 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
4966 | { | |
6a3f13f0 DH |
4967 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4968 | scm_list_2 (arg1, arg2), | |
4969 | SCM_ENV (proc)); | |
4970 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4971 | return result; |
504d99c5 MD |
4972 | } |
4973 | ||
4974 | scm_t_trampoline_2 | |
4975 | scm_trampoline_2 (SCM proc) | |
4976 | { | |
2510c810 DH |
4977 | scm_t_trampoline_2 trampoline; |
4978 | ||
504d99c5 | 4979 | if (SCM_IMP (proc)) |
d0b07b5d | 4980 | return NULL; |
2510c810 | 4981 | |
504d99c5 MD |
4982 | switch (SCM_TYP7 (proc)) |
4983 | { | |
4984 | case scm_tc7_subr_2: | |
4985 | case scm_tc7_subr_2o: | |
4986 | case scm_tc7_rpsubr: | |
4987 | case scm_tc7_asubr: | |
2510c810 DH |
4988 | trampoline = call_subr2_2; |
4989 | break; | |
9ed24633 | 4990 | case scm_tc7_lsubr_2: |
2510c810 DH |
4991 | trampoline = call_lsubr2_2; |
4992 | break; | |
504d99c5 | 4993 | case scm_tc7_lsubr: |
2510c810 DH |
4994 | trampoline = call_lsubr_2; |
4995 | break; | |
504d99c5 MD |
4996 | case scm_tcs_closures: |
4997 | { | |
4998 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4999 | if (!SCM_NULLP (formals) |
5000 | && (!SCM_CONSP (formals) | |
5001 | || (!SCM_NULLP (SCM_CDR (formals)) | |
5002 | && (!SCM_CONSP (SCM_CDR (formals)) | |
5003 | || !SCM_CONSP (SCM_CDDR (formals)))))) | |
2510c810 | 5004 | trampoline = call_closure_2; |
504d99c5 | 5005 | else |
d0b07b5d | 5006 | return NULL; |
2510c810 | 5007 | break; |
504d99c5 MD |
5008 | } |
5009 | case scm_tcs_struct: | |
5010 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 5011 | trampoline = scm_call_generic_2; |
2ca0d207 | 5012 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
5013 | trampoline = scm_call_2; |
5014 | else | |
5015 | return NULL; | |
5016 | break; | |
504d99c5 MD |
5017 | case scm_tc7_smob: |
5018 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 5019 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 5020 | else |
d0b07b5d | 5021 | return NULL; |
2510c810 | 5022 | break; |
504d99c5 MD |
5023 | case scm_tc7_cclo: |
5024 | case scm_tc7_pws: | |
2510c810 DH |
5025 | trampoline = scm_call_2; |
5026 | break; | |
504d99c5 | 5027 | default: |
d0b07b5d | 5028 | return NULL; /* not applicable on two args */ |
504d99c5 | 5029 | } |
2510c810 DH |
5030 | /* We only reach this point if a valid trampoline was determined. */ |
5031 | ||
5032 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
5033 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
5034 | if (SCM_DEBUGGINGP) | |
5035 | return scm_call_2; | |
5036 | else | |
5037 | return trampoline; | |
504d99c5 MD |
5038 | } |
5039 | ||
d9c393f5 JB |
5040 | /* Typechecking for multi-argument MAP and FOR-EACH. |
5041 | ||
47c3f06d | 5042 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 5043 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 5044 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 5045 | static inline void |
47c3f06d | 5046 | check_map_args (SCM argv, |
c014a02e | 5047 | long len, |
47c3f06d MD |
5048 | SCM gf, |
5049 | SCM proc, | |
5050 | SCM args, | |
5051 | const char *who) | |
d9c393f5 | 5052 | { |
34d19ef6 | 5053 | SCM const *ve = SCM_VELTS (argv); |
c014a02e | 5054 | long i; |
d9c393f5 | 5055 | |
b5c2579a | 5056 | for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 5057 | { |
c014a02e | 5058 | long elt_len = scm_ilength (ve[i]); |
d9c393f5 JB |
5059 | |
5060 | if (elt_len < 0) | |
47c3f06d MD |
5061 | { |
5062 | if (gf) | |
5063 | scm_apply_generic (gf, scm_cons (proc, args)); | |
5064 | else | |
5065 | scm_wrong_type_arg (who, i + 2, ve[i]); | |
5066 | } | |
d9c393f5 JB |
5067 | |
5068 | if (elt_len != len) | |
504d99c5 | 5069 | scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2)); |
d9c393f5 JB |
5070 | } |
5071 | ||
5d2b97cd | 5072 | scm_remember_upto_here_1 (argv); |
d9c393f5 JB |
5073 | } |
5074 | ||
5075 | ||
47c3f06d | 5076 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 5077 | |
368bf056 MD |
5078 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
5079 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 5080 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 5081 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 5082 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
5083 | */ |
5084 | ||
0f2d19dd | 5085 | SCM |
1bbd0b84 | 5086 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5087 | #define FUNC_NAME s_map |
0f2d19dd | 5088 | { |
c014a02e | 5089 | long i, len; |
0f2d19dd JB |
5090 | SCM res = SCM_EOL; |
5091 | SCM *pres = &res; | |
34d19ef6 | 5092 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
0f2d19dd | 5093 | |
d9c393f5 | 5094 | len = scm_ilength (arg1); |
47c3f06d MD |
5095 | SCM_GASSERTn (len >= 0, |
5096 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5097 | SCM_VALIDATE_REST_ARGUMENT (args); |
0f2d19dd JB |
5098 | if (SCM_NULLP (args)) |
5099 | { | |
504d99c5 MD |
5100 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5101 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5102 | while (SCM_NIMP (arg1)) | |
5103 | { | |
5104 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5105 | pres = SCM_CDRLOC (*pres); | |
5106 | arg1 = SCM_CDR (arg1); | |
5107 | } | |
5108 | return res; | |
5109 | } | |
5110 | if (SCM_NULLP (SCM_CDR (args))) | |
5111 | { | |
5112 | SCM arg2 = SCM_CAR (args); | |
5113 | int len2 = scm_ilength (arg2); | |
5114 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5115 | SCM_GASSERTn (call, | |
5116 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5117 | SCM_GASSERTn (len2 >= 0, | |
5118 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5119 | if (len2 != len) | |
5120 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5121 | while (SCM_NIMP (arg1)) |
5122 | { | |
504d99c5 | 5123 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5124 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5125 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5126 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5127 | } |
5128 | return res; | |
5129 | } | |
05b15362 DH |
5130 | arg1 = scm_cons (arg1, args); |
5131 | args = scm_vector (arg1); | |
0f2d19dd | 5132 | ve = SCM_VELTS (args); |
47c3f06d | 5133 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5134 | while (1) |
5135 | { | |
5136 | arg1 = SCM_EOL; | |
b5c2579a | 5137 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5138 | { |
d9c393f5 JB |
5139 | if (SCM_IMP (ve[i])) |
5140 | return res; | |
0f2d19dd | 5141 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5142 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd | 5143 | } |
8ea46249 | 5144 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5145 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5146 | } |
5147 | } | |
af45e3b0 | 5148 | #undef FUNC_NAME |
0f2d19dd JB |
5149 | |
5150 | ||
47c3f06d | 5151 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5152 | |
0f2d19dd | 5153 | SCM |
1bbd0b84 | 5154 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5155 | #define FUNC_NAME s_for_each |
0f2d19dd | 5156 | { |
34d19ef6 | 5157 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
c014a02e | 5158 | long i, len; |
d9c393f5 | 5159 | len = scm_ilength (arg1); |
47c3f06d MD |
5160 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5161 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5162 | SCM_VALIDATE_REST_ARGUMENT (args); |
c96d76b8 | 5163 | if (SCM_NULLP (args)) |
0f2d19dd | 5164 | { |
504d99c5 MD |
5165 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5166 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5167 | while (SCM_NIMP (arg1)) | |
5168 | { | |
5169 | call (proc, SCM_CAR (arg1)); | |
5170 | arg1 = SCM_CDR (arg1); | |
5171 | } | |
5172 | return SCM_UNSPECIFIED; | |
5173 | } | |
5174 | if (SCM_NULLP (SCM_CDR (args))) | |
5175 | { | |
5176 | SCM arg2 = SCM_CAR (args); | |
5177 | int len2 = scm_ilength (arg2); | |
5178 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5179 | SCM_GASSERTn (call, g_for_each, | |
5180 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5181 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5182 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5183 | if (len2 != len) | |
5184 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5185 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5186 | { |
504d99c5 | 5187 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5188 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5189 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5190 | } |
5191 | return SCM_UNSPECIFIED; | |
5192 | } | |
05b15362 DH |
5193 | arg1 = scm_cons (arg1, args); |
5194 | args = scm_vector (arg1); | |
0f2d19dd | 5195 | ve = SCM_VELTS (args); |
47c3f06d | 5196 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5197 | while (1) |
5198 | { | |
5199 | arg1 = SCM_EOL; | |
b5c2579a | 5200 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5201 | { |
c96d76b8 NJ |
5202 | if (SCM_IMP (ve[i])) |
5203 | return SCM_UNSPECIFIED; | |
0f2d19dd | 5204 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5205 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd JB |
5206 | } |
5207 | scm_apply (proc, arg1, SCM_EOL); | |
5208 | } | |
5209 | } | |
af45e3b0 | 5210 | #undef FUNC_NAME |
0f2d19dd | 5211 | |
1cc91f1b | 5212 | |
0f2d19dd | 5213 | SCM |
6e8d25a6 | 5214 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5215 | { |
16d4699b MV |
5216 | SCM z; |
5217 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5218 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5219 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5220 | return z; |
5221 | } | |
5222 | ||
5223 | ||
92c2555f | 5224 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5225 | |
0f2d19dd | 5226 | SCM |
6e8d25a6 | 5227 | scm_makprom (SCM code) |
0f2d19dd | 5228 | { |
28d52ebb MD |
5229 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5230 | SCM_UNPACK (code), | |
5231 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
5232 | } |
5233 | ||
28d52ebb MD |
5234 | static size_t |
5235 | promise_free (SCM promise) | |
5236 | { | |
5237 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
5238 | return 0; | |
5239 | } | |
1cc91f1b | 5240 | |
0f2d19dd | 5241 | static int |
e841c3e0 | 5242 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5243 | { |
19402679 | 5244 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5245 | scm_puts ("#<promise ", port); |
19402679 | 5246 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5247 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5248 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5249 | scm_putc ('>', port); |
0f2d19dd JB |
5250 | return !0; |
5251 | } | |
5252 | ||
3b3b36dd | 5253 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5254 | (SCM promise), |
67e8151b MG |
5255 | "If the promise @var{x} has not been computed yet, compute and\n" |
5256 | "return @var{x}, otherwise just return the previously computed\n" | |
5257 | "value.") | |
1bbd0b84 | 5258 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5259 | { |
28d52ebb MD |
5260 | SCM_VALIDATE_SMOB (1, promise, promise); |
5261 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
5262 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5263 | { |
28d52ebb MD |
5264 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5265 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5266 | { |
28d52ebb MD |
5267 | SCM_SET_PROMISE_DATA (promise, ans); |
5268 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5269 | } |
5270 | } | |
28d52ebb MD |
5271 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
5272 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 5273 | } |
1bbd0b84 | 5274 | #undef FUNC_NAME |
0f2d19dd | 5275 | |
445f675c | 5276 | |
a1ec6916 | 5277 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5278 | (SCM obj), |
b380b885 | 5279 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5280 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5281 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5282 | { |
67e8151b | 5283 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5284 | } |
1bbd0b84 | 5285 | #undef FUNC_NAME |
0f2d19dd | 5286 | |
445f675c | 5287 | |
a1ec6916 | 5288 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5289 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5290 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5291 | "Any source properties associated with @var{xorig} are also associated\n" | |
5292 | "with the new pair.") | |
1bbd0b84 | 5293 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5294 | { |
5295 | SCM p, z; | |
16d4699b | 5296 | z = scm_cons (x, y); |
26d5b9b4 MD |
5297 | /* Copy source properties possibly associated with xorig. */ |
5298 | p = scm_whash_lookup (scm_source_whash, xorig); | |
445f675c | 5299 | if (!SCM_IMP (p)) |
26d5b9b4 MD |
5300 | scm_whash_insert (scm_source_whash, z, p); |
5301 | return z; | |
5302 | } | |
1bbd0b84 | 5303 | #undef FUNC_NAME |
26d5b9b4 | 5304 | |
445f675c | 5305 | |
a1ec6916 | 5306 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5307 | (SCM obj), |
b380b885 MD |
5308 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
5309 | "pointer to the new data structure. @code{copy-tree} recurses down the\n" | |
5310 | "contents of both pairs and vectors (since both cons cells and vector\n" | |
5311 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5312 | "any other object.") | |
1bbd0b84 | 5313 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd JB |
5314 | { |
5315 | SCM ans, tl; | |
26d5b9b4 | 5316 | if (SCM_IMP (obj)) |
ff467021 | 5317 | return obj; |
3910272e MD |
5318 | if (SCM_VECTORP (obj)) |
5319 | { | |
c014a02e | 5320 | unsigned long i = SCM_VECTOR_LENGTH (obj); |
00ffa0e7 | 5321 | ans = scm_c_make_vector (i, SCM_UNSPECIFIED); |
3910272e | 5322 | while (i--) |
34d19ef6 | 5323 | SCM_VECTOR_SET (ans, i, scm_copy_tree (SCM_VELTS (obj)[i])); |
3910272e MD |
5324 | return ans; |
5325 | } | |
01f11e02 | 5326 | if (!SCM_CONSP (obj)) |
0f2d19dd | 5327 | return obj; |
26d5b9b4 MD |
5328 | ans = tl = scm_cons_source (obj, |
5329 | scm_copy_tree (SCM_CAR (obj)), | |
5330 | SCM_UNSPECIFIED); | |
05b15362 | 5331 | for (obj = SCM_CDR (obj); SCM_CONSP (obj); obj = SCM_CDR (obj)) |
a23afe53 MD |
5332 | { |
5333 | SCM_SETCDR (tl, scm_cons (scm_copy_tree (SCM_CAR (obj)), | |
5334 | SCM_UNSPECIFIED)); | |
5335 | tl = SCM_CDR (tl); | |
5336 | } | |
5337 | SCM_SETCDR (tl, obj); | |
0f2d19dd JB |
5338 | return ans; |
5339 | } | |
1bbd0b84 | 5340 | #undef FUNC_NAME |
0f2d19dd | 5341 | |
1cc91f1b | 5342 | |
4163eb72 MV |
5343 | /* We have three levels of EVAL here: |
5344 | ||
5345 | - scm_i_eval (exp, env) | |
5346 | ||
5347 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5348 | structure as used by the actual tree code evaluator. When ENV is | |
5349 | a top-level environment, then changes to the current module are | |
a513ead3 | 5350 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5351 | the current module. |
5352 | ||
5353 | - scm_primitive_eval (exp) | |
5354 | ||
5355 | evaluates EXP in the top-level environment as determined by the | |
5356 | current module. This is done by constructing a suitable | |
5357 | environment and calling scm_i_eval. Thus, changes to the | |
5358 | top-level module are tracked normally. | |
5359 | ||
5360 | - scm_eval (exp, mod) | |
5361 | ||
a513ead3 | 5362 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
5363 | setting the current module to MOD, invoking scm_primitive_eval on |
5364 | EXP, and then restoring the current module to the value it had | |
5365 | previously. That is, while EXP is evaluated, changes to the | |
5366 | current module are tracked, but these changes do not persist when | |
5367 | scm_eval returns. | |
5368 | ||
5369 | For each level of evals, there are two variants, distinguished by a | |
5370 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5371 | variant can destructively modify EXP into something completely | |
5372 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5373 | _x variants should not ever be used again for anything. So when in | |
5374 | doubt, use the ordinary variant. | |
5375 | ||
5376 | */ | |
5377 | ||
0f2d19dd | 5378 | SCM |
68d8be66 | 5379 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5380 | { |
68d8be66 | 5381 | return SCM_XEVAL (exp, env); |
0f2d19dd JB |
5382 | } |
5383 | ||
68d8be66 MD |
5384 | SCM |
5385 | scm_i_eval (SCM exp, SCM env) | |
5386 | { | |
26fb6390 | 5387 | exp = scm_copy_tree (exp); |
e37a4fba | 5388 | return SCM_XEVAL (exp, env); |
68d8be66 MD |
5389 | } |
5390 | ||
5391 | SCM | |
4163eb72 | 5392 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5393 | { |
a513ead3 | 5394 | SCM env; |
bcdab802 | 5395 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5396 | if (SCM_NIMP (transformer)) |
fdc28395 | 5397 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5398 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5399 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5400 | } |
5401 | ||
4163eb72 MV |
5402 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5403 | (SCM exp), | |
2069af38 | 5404 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5405 | "the current module.") |
5406 | #define FUNC_NAME s_scm_primitive_eval | |
5407 | { | |
a513ead3 | 5408 | SCM env; |
bcdab802 | 5409 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5410 | if (SCM_NIMP (transformer)) |
fdc28395 | 5411 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5412 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5413 | return scm_i_eval (exp, env); |
5414 | } | |
5415 | #undef FUNC_NAME | |
5416 | ||
68d8be66 MD |
5417 | /* Eval does not take the second arg optionally. This is intentional |
5418 | * in order to be R5RS compatible, and to prepare for the new module | |
5419 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5420 | * environment explicit. */ |
549e6ec6 | 5421 | |
09074dbf DH |
5422 | static void |
5423 | change_environment (void *data) | |
5424 | { | |
5425 | SCM pair = SCM_PACK (data); | |
5426 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 5427 | SCM old_module = scm_current_module (); |
09074dbf | 5428 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 5429 | scm_set_current_module (new_module); |
09074dbf DH |
5430 | } |
5431 | ||
5432 | ||
09074dbf DH |
5433 | static void |
5434 | restore_environment (void *data) | |
5435 | { | |
5436 | SCM pair = SCM_PACK (data); | |
5437 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 5438 | SCM new_module = scm_current_module (); |
2e9c835d | 5439 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 5440 | scm_set_current_module (old_module); |
09074dbf DH |
5441 | } |
5442 | ||
4163eb72 MV |
5443 | static SCM |
5444 | inner_eval_x (void *data) | |
5445 | { | |
5446 | return scm_primitive_eval_x (SCM_PACK(data)); | |
5447 | } | |
5448 | ||
5449 | SCM | |
5450 | scm_eval_x (SCM exp, SCM module) | |
5451 | #define FUNC_NAME "eval!" | |
5452 | { | |
5453 | SCM_VALIDATE_MODULE (2, module); | |
5454 | ||
5455 | return scm_internal_dynamic_wind | |
5456 | (change_environment, inner_eval_x, restore_environment, | |
5457 | (void *) SCM_UNPACK (exp), | |
5458 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
5459 | } | |
5460 | #undef FUNC_NAME | |
5461 | ||
5462 | static SCM | |
5463 | inner_eval (void *data) | |
5464 | { | |
5465 | return scm_primitive_eval (SCM_PACK(data)); | |
5466 | } | |
09074dbf | 5467 | |
68d8be66 | 5468 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
5469 | (SCM exp, SCM module), |
5470 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
5471 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 5472 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
5473 | "@var{module} is made the current module. The current module\n" |
5474 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 5475 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5476 | { |
4163eb72 | 5477 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
5478 | |
5479 | return scm_internal_dynamic_wind | |
5480 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
5481 | (void *) SCM_UNPACK (exp), |
5482 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 5483 | } |
1bbd0b84 | 5484 | #undef FUNC_NAME |
0f2d19dd | 5485 | |
6dbd0af5 MD |
5486 | |
5487 | /* At this point, scm_deval and scm_dapply are generated. | |
5488 | */ | |
5489 | ||
a44a9715 DH |
5490 | #define DEVAL |
5491 | #include "eval.c" | |
0f2d19dd | 5492 | |
1cc91f1b | 5493 | |
0f2d19dd JB |
5494 | void |
5495 | scm_init_eval () | |
0f2d19dd | 5496 | { |
33b97402 MD |
5497 | scm_init_opts (scm_evaluator_traps, |
5498 | scm_evaluator_trap_table, | |
5499 | SCM_N_EVALUATOR_TRAPS); | |
5500 | scm_init_opts (scm_eval_options_interface, | |
5501 | scm_eval_opts, | |
5502 | SCM_N_EVAL_OPTIONS); | |
5503 | ||
f99c9c28 MD |
5504 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
5505 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 5506 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 5507 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 5508 | |
a44a9715 DH |
5509 | undefineds = scm_list_1 (SCM_UNDEFINED); |
5510 | SCM_SETCDR (undefineds, undefineds); | |
5511 | scm_permanent_object (undefineds); | |
7c33806a | 5512 | |
a44a9715 | 5513 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 5514 | |
a44a9715 DH |
5515 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
5516 | scm_permanent_object (f_apply); | |
86d31dfe | 5517 | |
a0599745 | 5518 | #include "libguile/eval.x" |
60a49842 | 5519 | |
25eaf21a | 5520 | scm_add_feature ("delay"); |
0f2d19dd | 5521 | } |
0f2d19dd | 5522 | |
6dbd0af5 | 5523 | #endif /* !DEVAL */ |
89e00824 ML |
5524 | |
5525 | /* | |
5526 | Local Variables: | |
5527 | c-file-style: "gnu" | |
5528 | End: | |
5529 | */ |