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 | ||
9a848baf DH |
222 | /* If something else than an exact integer is detected as the argument for |
223 | * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */ | |
224 | static const char s_bad_slot_number[] = "Bad slot number"; | |
225 | ||
e6729603 DH |
226 | |
227 | /* Signal a syntax error. We distinguish between the form that caused the | |
228 | * error and the enclosing expression. The error message will print out as | |
229 | * shown in the following pattern. The file name and line number are only | |
230 | * given when they can be determined from the erroneous form or from the | |
231 | * enclosing expression. | |
232 | * | |
233 | * <filename>: In procedure memoization: | |
234 | * <filename>: In file <name>, line <nr>: <error-message> in <expression>. */ | |
235 | ||
236 | SCM_SYMBOL (syntax_error_key, "syntax-error"); | |
237 | ||
238 | /* The prototype is needed to indicate that the function does not return. */ | |
239 | static void | |
240 | syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN; | |
241 | ||
242 | static void | |
243 | syntax_error (const char* const msg, const SCM form, const SCM expr) | |
244 | { | |
245 | const SCM msg_string = scm_makfrom0str (msg); | |
246 | SCM filename = SCM_BOOL_F; | |
247 | SCM linenr = SCM_BOOL_F; | |
248 | const char *format; | |
249 | SCM args; | |
250 | ||
251 | if (SCM_CONSP (form)) | |
252 | { | |
253 | filename = scm_source_property (form, scm_sym_filename); | |
254 | linenr = scm_source_property (form, scm_sym_line); | |
255 | } | |
256 | ||
257 | if (SCM_FALSEP (filename) && SCM_FALSEP (linenr) && SCM_CONSP (expr)) | |
258 | { | |
259 | filename = scm_source_property (expr, scm_sym_filename); | |
260 | linenr = scm_source_property (expr, scm_sym_line); | |
261 | } | |
262 | ||
263 | if (!SCM_UNBNDP (expr)) | |
264 | { | |
265 | if (!SCM_FALSEP (filename)) | |
266 | { | |
267 | format = "In file ~S, line ~S: ~A ~S in expression ~S."; | |
268 | args = scm_list_5 (filename, linenr, msg_string, form, expr); | |
269 | } | |
270 | else if (!SCM_FALSEP (linenr)) | |
271 | { | |
272 | format = "In line ~S: ~A ~S in expression ~S."; | |
273 | args = scm_list_4 (linenr, msg_string, form, expr); | |
274 | } | |
275 | else | |
276 | { | |
277 | format = "~A ~S in expression ~S."; | |
278 | args = scm_list_3 (msg_string, form, expr); | |
279 | } | |
280 | } | |
281 | else | |
282 | { | |
283 | if (!SCM_FALSEP (filename)) | |
284 | { | |
285 | format = "In file ~S, line ~S: ~A ~S."; | |
286 | args = scm_list_4 (filename, linenr, msg_string, form); | |
287 | } | |
288 | else if (!SCM_FALSEP (linenr)) | |
289 | { | |
290 | format = "In line ~S: ~A ~S."; | |
291 | args = scm_list_3 (linenr, msg_string, form); | |
292 | } | |
293 | else | |
294 | { | |
295 | format = "~A ~S."; | |
296 | args = scm_list_2 (msg_string, form); | |
297 | } | |
298 | } | |
299 | ||
300 | scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F); | |
301 | } | |
302 | ||
303 | ||
304 | /* Shortcut macros to simplify syntax error handling. */ | |
305 | #define ASSERT_SYNTAX(cond, message, form) \ | |
306 | { if (!(cond)) syntax_error (message, form, SCM_UNDEFINED); } | |
307 | #define ASSERT_SYNTAX_2(cond, message, form, expr) \ | |
308 | { if (!(cond)) syntax_error (message, form, expr); } | |
309 | ||
310 | \f | |
311 | ||
d0624e39 DH |
312 | /* {Ilocs} |
313 | * | |
314 | * Ilocs are memoized references to variables in local environment frames. | |
315 | * They are represented as three values: The relative offset of the | |
316 | * environment frame, the number of the binding within that frame, and a | |
317 | * boolean value indicating whether the binding is the last binding in the | |
318 | * frame. | |
319 | */ | |
320 | #define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc) | |
321 | #define SCM_IDINC (0x00100000L) | |
322 | #define SCM_IDSTMSK (-SCM_IDINC) | |
323 | #define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \ | |
324 | SCM_PACK ( \ | |
325 | ((frame_nr) << 8) \ | |
326 | + ((binding_nr) << 20) \ | |
327 | + ((last_p) ? SCM_ICDR : 0) \ | |
328 | + scm_tc8_iloc ) | |
329 | ||
330 | #if (SCM_DEBUG_DEBUGGING_SUPPORT == 1) | |
331 | ||
332 | SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp); | |
333 | SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0, | |
334 | (SCM frame, SCM binding, SCM cdrp), | |
335 | "Return a new iloc with frame offset @var{frame}, binding\n" | |
336 | "offset @var{binding} and the cdr flag @var{cdrp}.") | |
337 | #define FUNC_NAME s_scm_dbg_make_iloc | |
338 | { | |
339 | SCM_VALIDATE_INUM (1, frame); | |
340 | SCM_VALIDATE_INUM (2, binding); | |
341 | return SCM_MAKE_ILOC (SCM_INUM (frame), | |
342 | SCM_INUM (binding), | |
343 | !SCM_FALSEP (cdrp)); | |
344 | } | |
345 | #undef FUNC_NAME | |
346 | ||
347 | SCM scm_dbg_iloc_p (SCM obj); | |
348 | SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0, | |
349 | (SCM obj), | |
350 | "Return @code{#t} if @var{obj} is an iloc.") | |
351 | #define FUNC_NAME s_scm_dbg_iloc_p | |
352 | { | |
353 | return SCM_BOOL (SCM_ILOCP (obj)); | |
354 | } | |
355 | #undef FUNC_NAME | |
356 | ||
357 | #endif | |
358 | ||
359 | \f | |
360 | ||
17fa3fcf | 361 | #define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \ |
89bff2fc | 362 | ASSERT_SYNTAX (!SCM_EQ_P ((x), SCM_EOL), s_empty_combination, x) |
17fa3fcf DH |
363 | |
364 | \f | |
365 | ||
6dbd0af5 MD |
366 | /* The evaluator contains a plethora of EVAL symbols. |
367 | * This is an attempt at explanation. | |
368 | * | |
369 | * The following macros should be used in code which is read twice | |
370 | * (where the choice of evaluator is hard soldered): | |
371 | * | |
372 | * SCM_CEVAL is the symbol used within one evaluator to call itself. | |
373 | * Originally, it is defined to scm_ceval, but is redefined to | |
374 | * scm_deval during the second pass. | |
375 | * | |
6cb702da | 376 | * SCM_EVALIM is used when it is known that the expression is an |
6dbd0af5 MD |
377 | * immediate. (This macro never calls an evaluator.) |
378 | * | |
379 | * EVALCAR evaluates the car of an expression. | |
380 | * | |
6dbd0af5 MD |
381 | * The following macros should be used in code which is read once |
382 | * (where the choice of evaluator is dynamic): | |
383 | * | |
6cb702da | 384 | * SCM_XEVAL takes care of immediates without calling an evaluator. It |
6dbd0af5 MD |
385 | * then calls scm_ceval *or* scm_deval, depending on the debugging |
386 | * mode. | |
387 | * | |
6cb702da | 388 | * SCM_XEVALCAR corresponds to EVALCAR, but uses scm_ceval *or* scm_deval |
6dbd0af5 MD |
389 | * depending on the debugging mode. |
390 | * | |
391 | * The main motivation for keeping this plethora is efficiency | |
392 | * together with maintainability (=> locality of code). | |
393 | */ | |
394 | ||
6cb702da | 395 | #define SCM_CEVAL scm_ceval |
0f2d19dd | 396 | |
e90c3a89 DH |
397 | #define SCM_EVALIM2(x) \ |
398 | ((SCM_EQ_P ((x), SCM_EOL) \ | |
89bff2fc | 399 | ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \ |
e90c3a89 DH |
400 | : 0), \ |
401 | (x)) | |
402 | ||
403 | #define SCM_EVALIM(x, env) (SCM_ILOCP (x) \ | |
404 | ? *scm_ilookup ((x), env) \ | |
405 | : SCM_EVALIM2(x)) | |
406 | ||
407 | #define SCM_XEVAL(x, env) (SCM_IMP (x) \ | |
408 | ? SCM_EVALIM2(x) \ | |
409 | : (*scm_ceval_ptr) ((x), (env))) | |
410 | ||
411 | #define SCM_XEVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ | |
412 | ? SCM_EVALIM (SCM_CAR (x), env) \ | |
413 | : (SCM_SYMBOLP (SCM_CAR (x)) \ | |
414 | ? *scm_lookupcar (x, env, 1) \ | |
415 | : (*scm_ceval_ptr) (SCM_CAR (x), env))) | |
416 | ||
8c494e99 | 417 | #define EVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \ |
904a077d | 418 | ? SCM_EVALIM (SCM_CAR (x), env) \ |
680516ba DH |
419 | : (SCM_SYMBOLP (SCM_CAR (x)) \ |
420 | ? *scm_lookupcar (x, env, 1) \ | |
421 | : SCM_CEVAL (SCM_CAR (x), env))) | |
0f2d19dd | 422 | |
28d52ebb | 423 | SCM_REC_MUTEX (source_mutex); |
9bc4701c | 424 | |
12841895 | 425 | |
e90c3a89 | 426 | static const char s_test[] = "bad test"; |
e90c3a89 DH |
427 | static const char s_bindings[] = "bad bindings"; |
428 | static const char s_duplicate_bindings[] = "duplicate bindings"; | |
429 | static const char s_variable[] = "bad variable"; | |
e90c3a89 DH |
430 | static const char s_splicing[] = "bad (non-list) result for unquote-splicing"; |
431 | ||
432 | ||
12841895 DH |
433 | /* Lookup a given local variable in an environment. The local variable is |
434 | * given as an iloc, that is a triple <frame, binding, last?>, where frame | |
435 | * indicates the relative number of the environment frame (counting upwards | |
436 | * from the innermost environment frame), binding indicates the number of the | |
437 | * binding within the frame, and last? (which is extracted from the iloc using | |
438 | * the macro SCM_ICDRP) indicates whether the binding forms the binding at the | |
439 | * very end of the improper list of bindings. */ | |
0f2d19dd | 440 | SCM * |
6e8d25a6 | 441 | scm_ilookup (SCM iloc, SCM env) |
0f2d19dd | 442 | { |
12841895 DH |
443 | unsigned int frame_nr = SCM_IFRAME (iloc); |
444 | unsigned int binding_nr = SCM_IDIST (iloc); | |
445 | SCM frames = env; | |
446 | SCM bindings; | |
447 | ||
448 | for (; 0 != frame_nr; --frame_nr) | |
449 | frames = SCM_CDR (frames); | |
450 | ||
451 | bindings = SCM_CAR (frames); | |
452 | for (; 0 != binding_nr; --binding_nr) | |
453 | bindings = SCM_CDR (bindings); | |
454 | ||
0f2d19dd | 455 | if (SCM_ICDRP (iloc)) |
12841895 DH |
456 | return SCM_CDRLOC (bindings); |
457 | return SCM_CARLOC (SCM_CDR (bindings)); | |
0f2d19dd | 458 | } |
0f2d19dd | 459 | |
12841895 | 460 | |
89bff2fc DH |
461 | SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable"); |
462 | ||
463 | static void error_unbound_variable (SCM symbol) SCM_NORETURN; | |
464 | static void | |
465 | error_unbound_variable (SCM symbol) | |
466 | { | |
467 | scm_error (scm_unbound_variable_key, NULL, | |
468 | "Unbound variable: ~S", | |
469 | scm_list_1 (symbol), SCM_BOOL_F); | |
470 | } | |
471 | ||
472 | ||
f8769b1d MV |
473 | /* The Lookup Car Race |
474 | - by Eva Luator | |
475 | ||
476 | Memoization of variables and special forms is done while executing | |
477 | the code for the first time. As long as there is only one thread | |
478 | everything is fine, but as soon as two threads execute the same | |
479 | code concurrently `for the first time' they can come into conflict. | |
480 | ||
481 | This memoization includes rewriting variable references into more | |
482 | efficient forms and expanding macros. Furthermore, macro expansion | |
483 | includes `compiling' special forms like `let', `cond', etc. into | |
484 | tree-code instructions. | |
485 | ||
486 | There shouldn't normally be a problem with memoizing local and | |
904a077d | 487 | global variable references (into ilocs and variables), because all |
f8769b1d MV |
488 | threads will mutate the code in *exactly* the same way and (if I |
489 | read the C code correctly) it is not possible to observe a half-way | |
490 | mutated cons cell. The lookup procedure can handle this | |
491 | transparently without any critical sections. | |
492 | ||
493 | It is different with macro expansion, because macro expansion | |
494 | happens outside of the lookup procedure and can't be | |
904a077d MV |
495 | undone. Therefore the lookup procedure can't cope with it. It has |
496 | to indicate failure when it detects a lost race and hope that the | |
497 | caller can handle it. Luckily, it turns out that this is the case. | |
f8769b1d | 498 | |
904a077d | 499 | An example to illustrate this: Suppose that the following form will |
f8769b1d MV |
500 | be memoized concurrently by two threads |
501 | ||
502 | (let ((x 12)) x) | |
503 | ||
504 | Let's first examine the lookup of X in the body. The first thread | |
505 | decides that it has to find the symbol "x" in the environment and | |
506 | starts to scan it. Then the other thread takes over and actually | |
507 | overtakes the first. It looks up "x" and substitutes an | |
508 | appropriate iloc for it. Now the first thread continues and | |
509 | completes its lookup. It comes to exactly the same conclusions as | |
510 | the second one and could - without much ado - just overwrite the | |
511 | iloc with the same iloc. | |
512 | ||
513 | But let's see what will happen when the race occurs while looking | |
514 | up the symbol "let" at the start of the form. It could happen that | |
515 | the second thread interrupts the lookup of the first thread and not | |
904a077d MV |
516 | only substitutes a variable for it but goes right ahead and |
517 | replaces it with the compiled form (#@let* (x 12) x). Now, when | |
518 | the first thread completes its lookup, it would replace the #@let* | |
519 | with a variable containing the "let" binding, effectively reverting | |
520 | the form to (let (x 12) x). This is wrong. It has to detect that | |
521 | it has lost the race and the evaluator has to reconsider the | |
522 | changed form completely. | |
f8769b1d MV |
523 | |
524 | This race condition could be resolved with some kind of traffic | |
525 | light (like mutexes) around scm_lookupcar, but I think that it is | |
526 | best to avoid them in this case. They would serialize memoization | |
527 | completely and because lookup involves calling arbitrary Scheme | |
528 | code (via the lookup-thunk), threads could be blocked for an | |
529 | arbitrary amount of time or even deadlock. But with the current | |
530 | solution a lot of unnecessary work is potentially done. */ | |
531 | ||
9aa82b39 | 532 | /* SCM_LOOKUPCAR1 is what SCM_LOOKUPCAR used to be but is allowed to |
f8769b1d MV |
533 | return NULL to indicate a failed lookup due to some race conditions |
534 | between threads. This only happens when VLOC is the first cell of | |
535 | a special form that will eventually be memoized (like `let', etc.) | |
536 | In that case the whole lookup is bogus and the caller has to | |
537 | reconsider the complete special form. | |
538 | ||
539 | SCM_LOOKUPCAR is still there, of course. It just calls | |
de513fa0 | 540 | SCM_LOOKUPCAR1 and aborts on receiving NULL. So SCM_LOOKUPCAR |
f8769b1d MV |
541 | should only be called when it is known that VLOC is not the first |
542 | pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check | |
26d5b9b4 MD |
543 | for NULL. I think I've found the only places where this |
544 | applies. */ | |
f8769b1d | 545 | |
8ecf1f13 | 546 | static SCM * |
26d5b9b4 | 547 | scm_lookupcar1 (SCM vloc, SCM genv, int check) |
0f2d19dd JB |
548 | { |
549 | SCM env = genv; | |
e3173f93 | 550 | register SCM *al, fl, var = SCM_CAR (vloc); |
0f2d19dd | 551 | register SCM iloc = SCM_ILOC00; |
0f2d19dd JB |
552 | for (; SCM_NIMP (env); env = SCM_CDR (env)) |
553 | { | |
790071cd | 554 | if (!SCM_CONSP (SCM_CAR (env))) |
0f2d19dd | 555 | break; |
a23afe53 | 556 | al = SCM_CARLOC (env); |
0f2d19dd JB |
557 | for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl)) |
558 | { | |
01f11e02 | 559 | if (!SCM_CONSP (fl)) |
33b97402 | 560 | { |
cf498326 | 561 | if (SCM_EQ_P (fl, var)) |
0f2d19dd | 562 | { |
cf498326 | 563 | if (! SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 564 | goto race; |
3201d763 | 565 | SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR); |
a23afe53 | 566 | return SCM_CDRLOC (*al); |
0f2d19dd | 567 | } |
33b97402 MD |
568 | else |
569 | break; | |
570 | } | |
a23afe53 | 571 | al = SCM_CDRLOC (*al); |
cf498326 | 572 | if (SCM_EQ_P (SCM_CAR (fl), var)) |
0f2d19dd | 573 | { |
0f2d19dd JB |
574 | if (SCM_UNBNDP (SCM_CAR (*al))) |
575 | { | |
576 | env = SCM_EOL; | |
577 | goto errout; | |
578 | } | |
c6772927 | 579 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
f8769b1d | 580 | goto race; |
a23afe53 | 581 | SCM_SETCAR (vloc, iloc); |
a23afe53 | 582 | return SCM_CARLOC (*al); |
0f2d19dd | 583 | } |
3201d763 | 584 | iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC); |
0f2d19dd | 585 | } |
3201d763 | 586 | iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC)); |
0f2d19dd JB |
587 | } |
588 | { | |
86d31dfe | 589 | SCM top_thunk, real_var; |
790071cd | 590 | if (SCM_NIMP (env)) |
0f2d19dd | 591 | { |
86d31dfe MV |
592 | top_thunk = SCM_CAR (env); /* env now refers to a |
593 | top level env thunk */ | |
0f2d19dd JB |
594 | env = SCM_CDR (env); |
595 | } | |
596 | else | |
597 | top_thunk = SCM_BOOL_F; | |
86d31dfe MV |
598 | real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F); |
599 | if (SCM_FALSEP (real_var)) | |
0f2d19dd | 600 | goto errout; |
86d31dfe | 601 | |
01f11e02 | 602 | if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var))) |
86d31dfe MV |
603 | { |
604 | errout: | |
86d31dfe MV |
605 | if (check) |
606 | { | |
607 | if (SCM_NULLP (env)) | |
89bff2fc | 608 | error_unbound_variable (var); |
86d31dfe MV |
609 | else |
610 | scm_misc_error (NULL, "Damaged environment: ~S", | |
8ea46249 | 611 | scm_list_1 (var)); |
86d31dfe MV |
612 | } |
613 | else | |
614 | { | |
615 | /* A variable could not be found, but we shall | |
616 | not throw an error. */ | |
617 | static SCM undef_object = SCM_UNDEFINED; | |
618 | return &undef_object; | |
619 | } | |
09e4d064 | 620 | } |
86d31dfe | 621 | |
c6772927 | 622 | if (!SCM_EQ_P (SCM_CAR (vloc), var)) |
86d31dfe MV |
623 | { |
624 | /* Some other thread has changed the very cell we are working | |
625 | on. In effect, it must have done our job or messed it up | |
626 | completely. */ | |
627 | race: | |
628 | var = SCM_CAR (vloc); | |
d22a0ea1 MV |
629 | if (SCM_VARIABLEP (var)) |
630 | return SCM_VARIABLE_LOC (var); | |
86d31dfe MV |
631 | if (SCM_ITAG7 (var) == SCM_ITAG7 (SCM_ILOC00)) |
632 | return scm_ilookup (var, genv); | |
904a077d | 633 | /* We can't cope with anything else than variables and ilocs. When |
86d31dfe MV |
634 | a special form has been memoized (i.e. `let' into `#@let') we |
635 | return NULL and expect the calling function to do the right | |
636 | thing. For the evaluator, this means going back and redoing | |
637 | the dispatch on the car of the form. */ | |
638 | return NULL; | |
639 | } | |
f8769b1d | 640 | |
d22a0ea1 | 641 | SCM_SETCAR (vloc, real_var); |
86d31dfe MV |
642 | return SCM_VARIABLE_LOC (real_var); |
643 | } | |
0f2d19dd JB |
644 | } |
645 | ||
f8769b1d | 646 | SCM * |
6e8d25a6 | 647 | scm_lookupcar (SCM vloc, SCM genv, int check) |
f8769b1d | 648 | { |
26d5b9b4 | 649 | SCM *loc = scm_lookupcar1 (vloc, genv, check); |
f8769b1d MV |
650 | if (loc == NULL) |
651 | abort (); | |
652 | return loc; | |
653 | } | |
f8769b1d | 654 | |
2a6f7afe DH |
655 | /* Return true if the symbol is - from the point of view of a macro |
656 | * transformer - a literal in the sense specified in chapter "pattern | |
657 | * language" of R5RS. In the code below, however, we don't match the | |
658 | * definition of R5RS exactly: It returns true if the identifier has no | |
659 | * binding or if it is a syntactic keyword. */ | |
660 | static int | |
661 | literal_p (const SCM symbol, const SCM env) | |
662 | { | |
663 | const SCM x = scm_cons (symbol, SCM_UNDEFINED); | |
664 | const SCM value = *scm_lookupcar (x, env, 0); | |
665 | if (SCM_UNBNDP (value) || SCM_MACROP (value)) | |
666 | return 1; | |
667 | else | |
668 | return 0; | |
669 | } | |
670 | ||
1cc91f1b | 671 | |
0f2d19dd | 672 | SCM |
6e8d25a6 | 673 | scm_eval_car (SCM pair, SCM env) |
0f2d19dd | 674 | { |
6cb702da | 675 | return SCM_XEVALCAR (pair, env); |
0f2d19dd JB |
676 | } |
677 | ||
678 | \f | |
679 | /* | |
680 | * The following rewrite expressions and | |
681 | * some memoized forms have different syntax | |
682 | */ | |
683 | ||
85db4a2c DH |
684 | SCM_GLOBAL_SYMBOL (scm_sym_else, "else"); |
685 | SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote"); | |
686 | SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing"); | |
81123e6d | 687 | |
85db4a2c DH |
688 | SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame"); |
689 | SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame"); | |
690 | SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame"); | |
691 | SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace"); | |
0f2d19dd | 692 | |
0f2d19dd | 693 | |
34adf7ea DH |
694 | /* Rewrite the body (which is given as the list of expressions forming the |
695 | * body) into its internal form. The internal form of a body (<expr> ...) is | |
696 | * just the body itself, but prefixed with an ISYM that denotes to what kind | |
697 | * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body | |
698 | * starts with SCM_IM_LAMBDA, for example, a body of a let starts with | |
699 | * SCM_IM_LET, etc. The one exception is a body that belongs to a letrec that | |
700 | * has been formed by rewriting internal defines: It starts with SCM_IM_DEFINE | |
701 | * (instead of SCM_IM_LETREC). | |
702 | * | |
703 | * It is assumed that the calling expression has already made sure that the | |
704 | * body is a proper list. */ | |
26d5b9b4 | 705 | static SCM |
430b8401 | 706 | m_body (SCM op, SCM exprs) |
26d5b9b4 | 707 | { |
26d5b9b4 | 708 | /* Don't add another ISYM if one is present already. */ |
34adf7ea DH |
709 | if (SCM_ISYMP (SCM_CAR (exprs))) |
710 | return exprs; | |
711 | else | |
712 | return scm_cons (op, exprs); | |
26d5b9b4 MD |
713 | } |
714 | ||
1cc91f1b | 715 | |
910b5125 DH |
716 | /* The function m_expand_body memoizes a proper list of expressions forming a |
717 | * body. This function takes care of dealing with internal defines and | |
718 | * transforming them into an equivalent letrec expression. */ | |
719 | ||
720 | /* This is a helper function for m_expand_body. It helps to figure out whether | |
721 | * an expression denotes a syntactic keyword. */ | |
722 | static SCM | |
723 | try_macro_lookup (const SCM expr, const SCM env) | |
724 | { | |
725 | if (SCM_SYMBOLP (expr)) | |
726 | { | |
727 | const SCM tmp_pair = scm_list_1 (expr); | |
728 | const SCM value = *scm_lookupcar1 (tmp_pair, env, 0); | |
729 | return value; | |
730 | } | |
731 | else | |
732 | { | |
733 | return SCM_UNDEFINED; | |
734 | } | |
735 | } | |
736 | ||
737 | /* This is a helper function for m_expand_body. It expands user macros, | |
738 | * because for the correct translation of a body we need to know whether they | |
739 | * expand to a definition. */ | |
740 | static SCM | |
741 | expand_user_macros (SCM expr, const SCM env) | |
742 | { | |
743 | while (SCM_CONSP (expr)) | |
744 | { | |
745 | const SCM car_expr = SCM_CAR (expr); | |
746 | const SCM new_car = expand_user_macros (car_expr, env); | |
747 | const SCM value = try_macro_lookup (new_car, env); | |
748 | ||
749 | if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2) | |
750 | { | |
751 | /* User macros transform code into code. */ | |
752 | expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env); | |
753 | /* We need to reiterate on the transformed code. */ | |
754 | } | |
755 | else | |
756 | { | |
757 | /* No user macro: return. */ | |
758 | SCM_SETCAR (expr, new_car); | |
759 | return expr; | |
760 | } | |
761 | } | |
762 | ||
763 | return expr; | |
764 | } | |
765 | ||
766 | /* This is a helper function for m_expand_body. It determines if a given form | |
767 | * represents an application of a given built-in macro. The built-in macro to | |
768 | * check for is identified by its syntactic keyword. The form is an | |
769 | * application of the given macro if looking up the car of the form in the | |
770 | * given environment actually returns the built-in macro. */ | |
771 | static int | |
772 | is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env) | |
773 | { | |
774 | if (SCM_CONSP (form)) | |
775 | { | |
776 | const SCM car_form = SCM_CAR (form); | |
777 | const SCM value = try_macro_lookup (car_form, env); | |
778 | if (SCM_BUILTIN_MACRO_P (value)) | |
779 | { | |
780 | const SCM macro_name = scm_macro_name (value); | |
781 | return SCM_EQ_P (macro_name, syntactic_keyword); | |
782 | } | |
783 | } | |
784 | ||
785 | return 0; | |
786 | } | |
787 | ||
788 | static SCM | |
789 | m_expand_body (const SCM forms, const SCM env) | |
790 | { | |
791 | /* The first body form can be skipped since it is known to be the ISYM that | |
792 | * was prepended to the body by m_body. */ | |
793 | SCM cdr_forms = SCM_CDR (forms); | |
794 | SCM form_idx = cdr_forms; | |
795 | SCM definitions = SCM_EOL; | |
796 | SCM sequence = SCM_EOL; | |
797 | ||
798 | /* According to R5RS, the list of body forms consists of two parts: a number | |
799 | * (maybe zero) of definitions, followed by a non-empty sequence of | |
800 | * expressions. Each the definitions and the expressions may be grouped | |
801 | * arbitrarily with begin, but it is not allowed to mix definitions and | |
802 | * expressions. The task of the following loop therefore is to split the | |
803 | * list of body forms into the list of definitions and the sequence of | |
804 | * expressions. */ | |
805 | while (!SCM_NULLP (form_idx)) | |
806 | { | |
807 | const SCM form = SCM_CAR (form_idx); | |
808 | const SCM new_form = expand_user_macros (form, env); | |
809 | if (is_system_macro_p (scm_sym_define, new_form, env)) | |
810 | { | |
811 | definitions = scm_cons (new_form, definitions); | |
812 | form_idx = SCM_CDR (form_idx); | |
813 | } | |
814 | else if (is_system_macro_p (scm_sym_begin, new_form, env)) | |
815 | { | |
816 | /* We have encountered a group of forms. This has to be either a | |
817 | * (possibly empty) group of (possibly further grouped) definitions, | |
818 | * or a non-empty group of (possibly further grouped) | |
819 | * expressions. */ | |
820 | const SCM grouped_forms = SCM_CDR (new_form); | |
821 | unsigned int found_definition = 0; | |
822 | unsigned int found_expression = 0; | |
823 | SCM grouped_form_idx = grouped_forms; | |
824 | while (!found_expression && !SCM_NULLP (grouped_form_idx)) | |
825 | { | |
826 | const SCM inner_form = SCM_CAR (grouped_form_idx); | |
827 | const SCM new_inner_form = expand_user_macros (inner_form, env); | |
828 | if (is_system_macro_p (scm_sym_define, new_inner_form, env)) | |
829 | { | |
830 | found_definition = 1; | |
831 | definitions = scm_cons (new_inner_form, definitions); | |
832 | grouped_form_idx = SCM_CDR (grouped_form_idx); | |
833 | } | |
834 | else if (is_system_macro_p (scm_sym_begin, new_inner_form, env)) | |
835 | { | |
836 | const SCM inner_group = SCM_CDR (new_inner_form); | |
837 | grouped_form_idx | |
838 | = scm_append (scm_list_2 (inner_group, | |
839 | SCM_CDR (grouped_form_idx))); | |
840 | } | |
841 | else | |
842 | { | |
843 | /* The group marks the start of the expressions of the body. | |
844 | * We have to make sure that within the same group we have | |
845 | * not encountered a definition before. */ | |
846 | ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form); | |
847 | found_expression = 1; | |
848 | grouped_form_idx = SCM_EOL; | |
849 | } | |
850 | } | |
851 | ||
852 | /* We have finished processing the group. If we have not yet | |
853 | * encountered an expression we continue processing the forms of the | |
854 | * body to collect further definition forms. Otherwise, the group | |
855 | * marks the start of the sequence of expressions of the body. */ | |
856 | if (!found_expression) | |
857 | { | |
858 | form_idx = SCM_CDR (form_idx); | |
859 | } | |
860 | else | |
861 | { | |
862 | sequence = form_idx; | |
863 | form_idx = SCM_EOL; | |
864 | } | |
865 | } | |
866 | else | |
867 | { | |
868 | /* We have detected a form which is no definition. This marks the | |
869 | * start of the sequence of expressions of the body. */ | |
870 | sequence = form_idx; | |
871 | form_idx = SCM_EOL; | |
872 | } | |
873 | } | |
874 | ||
875 | /* FIXME: forms does not hold information about the file location. */ | |
876 | ASSERT_SYNTAX (SCM_CONSP (sequence), s_missing_body_expression, cdr_forms); | |
877 | ||
878 | if (!SCM_NULLP (definitions)) | |
879 | { | |
880 | SCM definition_idx; | |
881 | SCM letrec_tail; | |
882 | SCM letrec_expression; | |
883 | SCM new_letrec_expression; | |
884 | SCM new_body; | |
885 | ||
886 | SCM bindings = SCM_EOL; | |
887 | for (definition_idx = definitions; | |
888 | !SCM_NULLP (definition_idx); | |
889 | definition_idx = SCM_CDR (definition_idx)) | |
890 | { | |
891 | const SCM definition = SCM_CAR (definition_idx); | |
892 | const SCM canonical_definition = canonicalize_define (definition); | |
893 | const SCM binding = SCM_CDR (canonical_definition); | |
894 | bindings = scm_cons (binding, bindings); | |
895 | }; | |
896 | ||
897 | letrec_tail = scm_cons (bindings, sequence); | |
898 | /* FIXME: forms does not hold information about the file location. */ | |
899 | letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail); | |
900 | new_letrec_expression = scm_m_letrec (letrec_expression, env); | |
901 | new_body = scm_list_1 (new_letrec_expression); | |
902 | return new_body; | |
903 | } | |
904 | else | |
905 | { | |
906 | SCM_SETCAR (forms, SCM_CAR (sequence)); | |
907 | SCM_SETCDR (forms, SCM_CDR (sequence)); | |
908 | return forms; | |
909 | } | |
910 | } | |
911 | ||
912 | #if (SCM_ENABLE_DEPRECATED == 1) | |
913 | ||
914 | /* Deprecated in guile 1.7.0 on 2003-11-09. */ | |
915 | SCM | |
916 | scm_m_expand_body (SCM exprs, SCM env) | |
917 | { | |
918 | scm_c_issue_deprecation_warning | |
919 | ("`scm_m_expand_body' is deprecated."); | |
920 | return m_expand_body (exprs, env); | |
921 | } | |
922 | ||
923 | #endif | |
924 | ||
925 | ||
9fbee57e | 926 | /* Start of the memoizers for the standard R5RS builtin macros. */ |
0f2d19dd JB |
927 | |
928 | ||
3b88ed2a | 929 | SCM_SYNTAX (s_and, "and", scm_i_makbimacro, scm_m_and); |
8ea46249 | 930 | SCM_GLOBAL_SYMBOL (scm_sym_and, s_and); |
1cc91f1b | 931 | |
8ea46249 | 932 | SCM |
e6729603 | 933 | scm_m_and (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 934 | { |
e6729603 DH |
935 | const SCM cdr_expr = SCM_CDR (expr); |
936 | const long length = scm_ilength (cdr_expr); | |
937 | ||
938 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
939 | ||
940 | if (length == 0) | |
941 | { | |
942 | /* Special case: (and) is replaced by #t. */ | |
943 | return SCM_BOOL_T; | |
944 | } | |
0f2d19dd | 945 | else |
e6729603 DH |
946 | { |
947 | SCM_SETCAR (expr, SCM_IM_AND); | |
948 | return expr; | |
949 | } | |
0f2d19dd JB |
950 | } |
951 | ||
1cc91f1b | 952 | |
3b88ed2a | 953 | SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin); |
9fbee57e | 954 | SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin); |
8ea46249 DH |
955 | |
956 | SCM | |
2a6f7afe | 957 | scm_m_begin (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 958 | { |
2a6f7afe | 959 | const SCM cdr_expr = SCM_CDR (expr); |
21628685 DH |
960 | /* Dirk:FIXME:: An empty begin clause is not generally allowed by R5RS. |
961 | * That means, there should be a distinction between uses of begin where an | |
962 | * empty clause is OK and where it is not. */ | |
2a6f7afe DH |
963 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
964 | ||
965 | SCM_SETCAR (expr, SCM_IM_BEGIN); | |
966 | return expr; | |
0f2d19dd JB |
967 | } |
968 | ||
969 | ||
3b88ed2a | 970 | SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case); |
8ea46249 | 971 | SCM_GLOBAL_SYMBOL (scm_sym_case, s_case); |
1cc91f1b | 972 | |
8ea46249 | 973 | SCM |
2a6f7afe | 974 | scm_m_case (SCM expr, SCM env) |
0f2d19dd | 975 | { |
8ea46249 | 976 | SCM clauses; |
2a6f7afe DH |
977 | SCM all_labels = SCM_EOL; |
978 | ||
979 | /* Check, whether 'else is a literal, i. e. not bound to a value. */ | |
980 | const int else_literal_p = literal_p (scm_sym_else, env); | |
981 | ||
982 | const SCM cdr_expr = SCM_CDR (expr); | |
983 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
984 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr); | |
985 | ||
986 | clauses = SCM_CDR (cdr_expr); | |
8ea46249 | 987 | while (!SCM_NULLP (clauses)) |
0f2d19dd | 988 | { |
2a6f7afe DH |
989 | SCM labels; |
990 | ||
991 | const SCM clause = SCM_CAR (clauses); | |
992 | ASSERT_SYNTAX_2 (scm_ilength (clause) >= 2, | |
993 | s_bad_case_clause, clause, expr); | |
994 | ||
995 | labels = SCM_CAR (clause); | |
996 | if (SCM_CONSP (labels)) | |
997 | { | |
998 | ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0, | |
999 | s_bad_case_labels, labels, expr); | |
1000 | all_labels = scm_append_x (scm_list_2 (labels, all_labels)); | |
1001 | } | |
58a2510b DH |
1002 | else if (SCM_NULLP (labels)) |
1003 | { | |
1004 | /* The list of labels is empty. According to R5RS this is allowed. | |
1005 | * It means that the sequence of expressions will never be executed. | |
1006 | * Therefore, as an optimization, we could remove the whole | |
1007 | * clause. */ | |
1008 | } | |
2a6f7afe DH |
1009 | else |
1010 | { | |
1011 | ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p, | |
1012 | s_bad_case_labels, labels, expr); | |
1013 | ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)), | |
609a8b86 | 1014 | s_misplaced_else_clause, clause, expr); |
2a6f7afe DH |
1015 | } |
1016 | ||
1017 | /* build the new clause */ | |
1018 | if (SCM_EQ_P (labels, scm_sym_else)) | |
1019 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
1020 | ||
8ea46249 | 1021 | clauses = SCM_CDR (clauses); |
0f2d19dd | 1022 | } |
2a6f7afe DH |
1023 | |
1024 | /* Check whether all case labels are distinct. */ | |
1025 | for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels)) | |
1026 | { | |
1027 | const SCM label = SCM_CAR (all_labels); | |
4610b011 DH |
1028 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (label, SCM_CDR (all_labels))), |
1029 | s_duplicate_case_label, label, expr); | |
2a6f7afe DH |
1030 | } |
1031 | ||
1032 | SCM_SETCAR (expr, SCM_IM_CASE); | |
1033 | return expr; | |
0f2d19dd JB |
1034 | } |
1035 | ||
1036 | ||
3b88ed2a | 1037 | SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond); |
8ea46249 | 1038 | SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond); |
609a8b86 | 1039 | SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>"); |
1cc91f1b | 1040 | |
8ea46249 | 1041 | SCM |
609a8b86 | 1042 | scm_m_cond (SCM expr, SCM env) |
0f2d19dd | 1043 | { |
609a8b86 DH |
1044 | /* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */ |
1045 | const int else_literal_p = literal_p (scm_sym_else, env); | |
1046 | const int arrow_literal_p = literal_p (scm_sym_arrow, env); | |
1047 | ||
1048 | const SCM clauses = SCM_CDR (expr); | |
1049 | SCM clause_idx; | |
1050 | ||
1051 | ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr); | |
1052 | ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr); | |
1053 | ||
1054 | for (clause_idx = clauses; | |
1055 | !SCM_NULLP (clause_idx); | |
1056 | clause_idx = SCM_CDR (clause_idx)) | |
0f2d19dd | 1057 | { |
609a8b86 DH |
1058 | SCM test; |
1059 | ||
1060 | const SCM clause = SCM_CAR (clause_idx); | |
1061 | const long length = scm_ilength (clause); | |
1062 | ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr); | |
1063 | ||
1064 | test = SCM_CAR (clause); | |
1065 | if (SCM_EQ_P (test, scm_sym_else) && else_literal_p) | |
0f2d19dd | 1066 | { |
609a8b86 DH |
1067 | const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx)); |
1068 | ASSERT_SYNTAX_2 (length >= 2, | |
1069 | s_bad_cond_clause, clause, expr); | |
1070 | ASSERT_SYNTAX_2 (last_clause_p, | |
1071 | s_misplaced_else_clause, clause, expr); | |
1072 | SCM_SETCAR (clause, SCM_IM_ELSE); | |
0f2d19dd | 1073 | } |
609a8b86 DH |
1074 | else if (length >= 2 |
1075 | && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow) | |
1076 | && arrow_literal_p) | |
1077 | { | |
1078 | ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr); | |
1079 | ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr); | |
1080 | SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW); | |
8ea46249 | 1081 | } |
0f2d19dd | 1082 | } |
609a8b86 DH |
1083 | |
1084 | SCM_SETCAR (expr, SCM_IM_COND); | |
1085 | return expr; | |
0f2d19dd JB |
1086 | } |
1087 | ||
1cc91f1b | 1088 | |
0f572ba7 DH |
1089 | SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define); |
1090 | SCM_GLOBAL_SYMBOL (scm_sym_define, s_define); | |
5280aaca | 1091 | |
9fbee57e DH |
1092 | /* Guile provides an extension to R5RS' define syntax to represent function |
1093 | * currying in a compact way. With this extension, it is allowed to write | |
1094 | * (define <nested-variable> <body>), where <nested-variable> has of one of | |
1095 | * the forms (<nested-variable> <formals>), (<nested-variable> . <formal>), | |
1096 | * (<variable> <formals>) or (<variable> . <formal>). As in R5RS, <formals> | |
1097 | * should be either a sequence of zero or more variables, or a sequence of one | |
1098 | * or more variables followed by a space-delimited period and another | |
1099 | * variable. Each level of argument nesting wraps the <body> within another | |
1100 | * lambda expression. For example, the following forms are allowed, each one | |
1101 | * followed by an equivalent, more explicit implementation. | |
1102 | * Example 1: | |
1103 | * (define ((a b . c) . d) <body>) is equivalent to | |
1104 | * (define a (lambda (b . c) (lambda d <body>))) | |
1105 | * Example 2: | |
1106 | * (define (((a) b) c . d) <body>) is equivalent to | |
1107 | * (define a (lambda () (lambda (b) (lambda (c . d) <body>)))) | |
1108 | */ | |
1109 | /* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS | |
1110 | * module that does not implement this extension. */ | |
0f572ba7 DH |
1111 | static SCM |
1112 | canonicalize_define (const SCM expr) | |
5280aaca | 1113 | { |
cc56ba80 DH |
1114 | SCM body; |
1115 | SCM variable; | |
1116 | ||
1117 | const SCM cdr_expr = SCM_CDR (expr); | |
c86c440b | 1118 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); |
cc56ba80 DH |
1119 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); |
1120 | ||
1121 | body = SCM_CDR (cdr_expr); | |
1122 | variable = SCM_CAR (cdr_expr); | |
1123 | while (SCM_CONSP (variable)) | |
5280aaca | 1124 | { |
cc56ba80 DH |
1125 | /* This while loop realizes function currying by variable nesting. |
1126 | * Variable is known to be a nested-variable. In every iteration of the | |
1127 | * loop another level of lambda expression is created, starting with the | |
4610b011 DH |
1128 | * innermost one. Note that we don't check for duplicate formals here: |
1129 | * This will be done by the memoizer of the lambda expression. */ | |
cc56ba80 DH |
1130 | const SCM formals = SCM_CDR (variable); |
1131 | const SCM tail = scm_cons (formals, body); | |
1132 | ||
1133 | /* Add source properties to each new lambda expression: */ | |
1134 | const SCM lambda = scm_cons_source (variable, scm_sym_lambda, tail); | |
1135 | ||
1136 | body = scm_list_1 (lambda); | |
1137 | variable = SCM_CAR (variable); | |
5280aaca | 1138 | } |
cc56ba80 DH |
1139 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); |
1140 | ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr); | |
1141 | ||
0f572ba7 DH |
1142 | SCM_SETCAR (cdr_expr, variable); |
1143 | SCM_SETCDR (cdr_expr, body); | |
1144 | return expr; | |
1145 | } | |
1146 | ||
1147 | SCM | |
1148 | scm_m_define (SCM expr, SCM env) | |
1149 | { | |
1150 | SCM canonical_definition; | |
1151 | SCM cdr_canonical_definition; | |
1152 | SCM body; | |
1153 | ||
0f572ba7 DH |
1154 | canonical_definition = canonicalize_define (expr); |
1155 | cdr_canonical_definition = SCM_CDR (canonical_definition); | |
1156 | body = SCM_CDR (cdr_canonical_definition); | |
1157 | ||
9fbee57e | 1158 | if (SCM_TOP_LEVEL (env)) |
0f2d19dd | 1159 | { |
9fbee57e | 1160 | SCM var; |
0f572ba7 | 1161 | const SCM variable = SCM_CAR (cdr_canonical_definition); |
cc56ba80 | 1162 | const SCM value = scm_eval_car (body, env); |
9fbee57e DH |
1163 | if (SCM_REC_PROCNAMES_P) |
1164 | { | |
cc56ba80 | 1165 | SCM tmp = value; |
9fbee57e DH |
1166 | while (SCM_MACROP (tmp)) |
1167 | tmp = SCM_MACRO_CODE (tmp); | |
1168 | if (SCM_CLOSUREP (tmp) | |
1169 | /* Only the first definition determines the name. */ | |
1170 | && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name))) | |
cc56ba80 | 1171 | scm_set_procedure_property_x (tmp, scm_sym_name, variable); |
9fbee57e | 1172 | } |
cc56ba80 DH |
1173 | var = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T); |
1174 | SCM_VARIABLE_SET (var, value); | |
9fbee57e | 1175 | return SCM_UNSPECIFIED; |
26d5b9b4 | 1176 | } |
9fbee57e | 1177 | else |
cc56ba80 | 1178 | { |
0f572ba7 DH |
1179 | SCM_SETCAR (canonical_definition, SCM_IM_DEFINE); |
1180 | return canonical_definition; | |
cc56ba80 | 1181 | } |
0f2d19dd JB |
1182 | } |
1183 | ||
1184 | ||
8ae95199 DH |
1185 | /* This is a helper function for forms (<keyword> <expression>) that are |
1186 | * transformed into (#@<keyword> '() <memoized_expression>) in order to allow | |
1187 | * for easy creation of a thunk (i. e. a closure without arguments) using the | |
1188 | * ('() <memoized_expression>) tail of the memoized form. */ | |
1189 | static SCM | |
1190 | memoize_as_thunk_prototype (const SCM expr, const SCM env SCM_UNUSED) | |
1191 | { | |
1192 | const SCM cdr_expr = SCM_CDR (expr); | |
1193 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1194 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1195 | ||
1196 | SCM_SETCDR (expr, scm_cons (SCM_EOL, cdr_expr)); | |
1197 | ||
1198 | return expr; | |
1199 | } | |
1200 | ||
1201 | ||
3b88ed2a | 1202 | SCM_SYNTAX (s_delay, "delay", scm_i_makbimacro, scm_m_delay); |
9fbee57e | 1203 | SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay); |
1cc91f1b | 1204 | |
9fbee57e DH |
1205 | /* Promises are implemented as closures with an empty parameter list. Thus, |
1206 | * (delay <expression>) is transformed into (#@delay '() <expression>), where | |
1207 | * the empty list represents the empty parameter list. This representation | |
1208 | * allows for easy creation of the closure during evaluation. */ | |
8ea46249 | 1209 | SCM |
8ae95199 | 1210 | scm_m_delay (SCM expr, SCM env) |
0f2d19dd | 1211 | { |
8ae95199 DH |
1212 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1213 | SCM_SETCAR (new_expr, SCM_IM_DELAY); | |
1214 | return new_expr; | |
0f2d19dd JB |
1215 | } |
1216 | ||
8ea46249 | 1217 | |
a954ce1d DH |
1218 | SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do); |
1219 | SCM_GLOBAL_SYMBOL(scm_sym_do, s_do); | |
1220 | ||
302c12b4 | 1221 | /* DO gets the most radically altered syntax. The order of the vars is |
4610b011 DH |
1222 | * reversed here. During the evaluation this allows for simple consing of the |
1223 | * results of the inits and steps: | |
302c12b4 | 1224 | |
0f2d19dd | 1225 | (do ((<var1> <init1> <step1>) |
a954ce1d DH |
1226 | (<var2> <init2>) |
1227 | ... ) | |
1228 | (<test> <return>) | |
1229 | <body>) | |
302c12b4 | 1230 | |
0f2d19dd | 1231 | ;; becomes |
302c12b4 | 1232 | |
e681d187 | 1233 | (#@do (<init1> <init2> ... <initn>) |
a954ce1d DH |
1234 | (varn ... var2 var1) |
1235 | (<test> <return>) | |
1236 | (<body>) | |
1237 | <step1> <step2> ... <stepn>) ;; missing steps replaced by var | |
302c12b4 | 1238 | */ |
0f2d19dd | 1239 | SCM |
a954ce1d | 1240 | scm_m_do (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1241 | { |
a954ce1d DH |
1242 | SCM variables = SCM_EOL; |
1243 | SCM init_forms = SCM_EOL; | |
1244 | SCM step_forms = SCM_EOL; | |
1245 | SCM binding_idx; | |
1246 | SCM cddr_expr; | |
1247 | SCM exit_clause; | |
1248 | SCM commands; | |
1249 | SCM tail; | |
1250 | ||
1251 | const SCM cdr_expr = SCM_CDR (expr); | |
1252 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1253 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1254 | ||
1255 | /* Collect variables, init and step forms. */ | |
1256 | binding_idx = SCM_CAR (cdr_expr); | |
1257 | ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0, | |
1258 | s_bad_bindings, binding_idx, expr); | |
1259 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1260 | { |
a954ce1d DH |
1261 | const SCM binding = SCM_CAR (binding_idx); |
1262 | const long length = scm_ilength (binding); | |
1263 | ASSERT_SYNTAX_2 (length == 2 || length == 3, | |
1264 | s_bad_binding, binding, expr); | |
1265 | ||
302c12b4 | 1266 | { |
a954ce1d DH |
1267 | const SCM name = SCM_CAR (binding); |
1268 | const SCM init = SCM_CADR (binding); | |
1269 | const SCM step = (length == 2) ? name : SCM_CADDR (binding); | |
1270 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
4610b011 DH |
1271 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, variables)), |
1272 | s_duplicate_binding, name, expr); | |
1273 | ||
a954ce1d DH |
1274 | variables = scm_cons (name, variables); |
1275 | init_forms = scm_cons (init, init_forms); | |
1276 | step_forms = scm_cons (step, step_forms); | |
302c12b4 | 1277 | } |
0f2d19dd | 1278 | } |
a954ce1d DH |
1279 | init_forms = scm_reverse_x (init_forms, SCM_UNDEFINED); |
1280 | step_forms = scm_reverse_x (step_forms, SCM_UNDEFINED); | |
1281 | ||
1282 | /* Memoize the test form and the exit sequence. */ | |
1283 | cddr_expr = SCM_CDR (cdr_expr); | |
1284 | exit_clause = SCM_CAR (cddr_expr); | |
1285 | ASSERT_SYNTAX_2 (scm_ilength (exit_clause) >= 1, | |
1286 | s_bad_exit_clause, exit_clause, expr); | |
1287 | ||
1288 | commands = SCM_CDR (cddr_expr); | |
1289 | tail = scm_cons2 (exit_clause, commands, step_forms); | |
1290 | tail = scm_cons2 (init_forms, variables, tail); | |
1291 | SCM_SETCAR (expr, SCM_IM_DO); | |
1292 | SCM_SETCDR (expr, tail); | |
1293 | return expr; | |
0f2d19dd JB |
1294 | } |
1295 | ||
b8229a3b | 1296 | |
3b88ed2a | 1297 | SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if); |
9fbee57e | 1298 | SCM_GLOBAL_SYMBOL (scm_sym_if, s_if); |
b8229a3b | 1299 | |
9fbee57e | 1300 | SCM |
4610b011 | 1301 | scm_m_if (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1302 | { |
4610b011 DH |
1303 | const SCM cdr_expr = SCM_CDR (expr); |
1304 | const long length = scm_ilength (cdr_expr); | |
1305 | ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr); | |
1306 | SCM_SETCAR (expr, SCM_IM_IF); | |
1307 | return expr; | |
0f2d19dd JB |
1308 | } |
1309 | ||
302c12b4 | 1310 | |
3b88ed2a | 1311 | SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda); |
9fbee57e | 1312 | SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda); |
0f2d19dd | 1313 | |
4610b011 DH |
1314 | /* A helper function for memoize_lambda to support checking for duplicate |
1315 | * formal arguments: Return true if OBJ is `eq?' to one of the elements of | |
1316 | * LIST or to the cdr of the last cons. Therefore, LIST may have any of the | |
1317 | * forms that a formal argument can have: | |
1318 | * <rest>, (<arg1> ...), (<arg1> ... . <rest>) */ | |
9fbee57e | 1319 | static int |
4610b011 | 1320 | c_improper_memq (SCM obj, SCM list) |
5cb22e96 | 1321 | { |
9fbee57e DH |
1322 | for (; SCM_CONSP (list); list = SCM_CDR (list)) |
1323 | { | |
1324 | if (SCM_EQ_P (SCM_CAR (list), obj)) | |
4610b011 | 1325 | return 1; |
9fbee57e DH |
1326 | } |
1327 | return SCM_EQ_P (list, obj); | |
5cb22e96 DH |
1328 | } |
1329 | ||
28d52ebb | 1330 | SCM |
03a3e941 | 1331 | scm_m_lambda (SCM expr, SCM env SCM_UNUSED) |
28d52ebb | 1332 | { |
9fbee57e | 1333 | SCM formals; |
03a3e941 | 1334 | SCM formals_idx; |
34adf7ea DH |
1335 | SCM cddr_expr; |
1336 | int documentation; | |
1337 | SCM body; | |
1338 | SCM new_body; | |
03a3e941 DH |
1339 | |
1340 | const SCM cdr_expr = SCM_CDR (expr); | |
1341 | const long length = scm_ilength (cdr_expr); | |
1342 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1343 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
28d52ebb | 1344 | |
03a3e941 DH |
1345 | /* Before iterating the list of formal arguments, make sure the formals |
1346 | * actually are given as either a symbol or a non-cyclic list. */ | |
1347 | formals = SCM_CAR (cdr_expr); | |
1348 | if (SCM_CONSP (formals)) | |
1349 | { | |
1350 | /* Dirk:FIXME:: We should check for a cyclic list of formals, and if | |
1351 | * detected, report a 'Bad formals' error. */ | |
1352 | } | |
1353 | else | |
1354 | { | |
1355 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formals) || SCM_NULLP (formals), | |
1356 | s_bad_formals, formals, expr); | |
1357 | } | |
1cc91f1b | 1358 | |
03a3e941 DH |
1359 | /* Now iterate the list of formal arguments to check if all formals are |
1360 | * symbols, and that there are no duplicates. */ | |
1361 | formals_idx = formals; | |
1362 | while (SCM_CONSP (formals_idx)) | |
0f2d19dd | 1363 | { |
03a3e941 DH |
1364 | const SCM formal = SCM_CAR (formals_idx); |
1365 | const SCM next_idx = SCM_CDR (formals_idx); | |
1366 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (formal), s_bad_formal, formal, expr); | |
1367 | ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx), | |
1368 | s_duplicate_formal, formal, expr); | |
1369 | formals_idx = next_idx; | |
0f2d19dd | 1370 | } |
03a3e941 DH |
1371 | ASSERT_SYNTAX_2 (SCM_NULLP (formals_idx) || SCM_SYMBOLP (formals_idx), |
1372 | s_bad_formal, formals_idx, expr); | |
9fbee57e | 1373 | |
34adf7ea DH |
1374 | /* Memoize the body. Keep a potential documentation string. */ |
1375 | /* Dirk:FIXME:: We should probably extract the documentation string to | |
1376 | * some external database. Otherwise it will slow down execution, since | |
1377 | * the documentation string will have to be skipped with every execution | |
1378 | * of the closure. */ | |
1379 | cddr_expr = SCM_CDR (cdr_expr); | |
1380 | documentation = (length >= 3 && SCM_STRINGP (SCM_CAR (cddr_expr))); | |
1381 | body = documentation ? SCM_CDR (cddr_expr) : cddr_expr; | |
430b8401 | 1382 | new_body = m_body (SCM_IM_LAMBDA, body); |
34adf7ea DH |
1383 | |
1384 | SCM_SETCAR (expr, SCM_IM_LAMBDA); | |
1385 | if (documentation) | |
1386 | SCM_SETCDR (cddr_expr, new_body); | |
1387 | else | |
1388 | SCM_SETCDR (cdr_expr, new_body); | |
1389 | return expr; | |
0f2d19dd | 1390 | } |
6dbd0af5 | 1391 | |
0f2d19dd | 1392 | |
d6754c23 | 1393 | /* Check if the format of the bindings is ((<symbol> <init-form>) ...). */ |
302c12b4 | 1394 | static void |
d6754c23 | 1395 | check_bindings (const SCM bindings, const SCM expr) |
0f2d19dd | 1396 | { |
d6754c23 | 1397 | SCM binding_idx; |
302c12b4 | 1398 | |
d6754c23 DH |
1399 | ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0, |
1400 | s_bad_bindings, bindings, expr); | |
0f2d19dd | 1401 | |
d6754c23 DH |
1402 | binding_idx = bindings; |
1403 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
0f2d19dd | 1404 | { |
d6754c23 DH |
1405 | SCM name; /* const */ |
1406 | ||
1407 | const SCM binding = SCM_CAR (binding_idx); | |
1408 | ASSERT_SYNTAX_2 (scm_ilength (binding) == 2, | |
1409 | s_bad_binding, binding, expr); | |
1410 | ||
1411 | name = SCM_CAR (binding); | |
1412 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr); | |
0f2d19dd | 1413 | } |
d6754c23 | 1414 | } |
26d5b9b4 | 1415 | |
d6754c23 DH |
1416 | |
1417 | /* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are | |
1418 | * transformed to the lists (vn ... v2 v1) and (i1 i2 ... in). That is, the | |
1419 | * variables are returned in a list with their order reversed, and the init | |
1420 | * forms are returned in a list in the same order as they are given in the | |
1421 | * bindings. If a duplicate variable name is detected, an error is | |
1422 | * signalled. */ | |
1423 | static void | |
1424 | transform_bindings ( | |
1425 | const SCM bindings, const SCM expr, | |
1426 | SCM *const rvarptr, SCM *const initptr ) | |
1427 | { | |
1428 | SCM rvariables = SCM_EOL; | |
1429 | SCM rinits = SCM_EOL; | |
1430 | SCM binding_idx = bindings; | |
1431 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
1432 | { | |
1433 | const SCM binding = SCM_CAR (binding_idx); | |
1434 | const SCM cdr_binding = SCM_CDR (binding); | |
1435 | const SCM name = SCM_CAR (binding); | |
1436 | ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, rvariables)), | |
1437 | s_duplicate_binding, name, expr); | |
1438 | rvariables = scm_cons (name, rvariables); | |
1439 | rinits = scm_cons (SCM_CAR (cdr_binding), rinits); | |
1440 | } | |
1441 | *rvarptr = rvariables; | |
1442 | *initptr = scm_reverse_x (rinits, SCM_UNDEFINED); | |
0f2d19dd JB |
1443 | } |
1444 | ||
302c12b4 | 1445 | |
3b88ed2a | 1446 | SCM_SYNTAX(s_let, "let", scm_i_makbimacro, scm_m_let); |
2f0d1375 | 1447 | SCM_GLOBAL_SYMBOL(scm_sym_let, s_let); |
b8229a3b | 1448 | |
d6754c23 DH |
1449 | /* This function is a helper function for memoize_let. It transforms |
1450 | * (let name ((var init) ...) body ...) into | |
1451 | * ((letrec ((name (lambda (var ...) body ...))) name) init ...) | |
1452 | * and memoizes the expression. It is assumed that the caller has checked | |
1453 | * that name is a symbol and that there are bindings and a body. */ | |
1454 | static SCM | |
1455 | memoize_named_let (const SCM expr, const SCM env SCM_UNUSED) | |
1456 | { | |
1457 | SCM rvariables; | |
1458 | SCM variables; | |
1459 | SCM inits; | |
1460 | ||
1461 | const SCM cdr_expr = SCM_CDR (expr); | |
1462 | const SCM name = SCM_CAR (cdr_expr); | |
1463 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1464 | const SCM bindings = SCM_CAR (cddr_expr); | |
1465 | check_bindings (bindings, expr); | |
1466 | ||
1467 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1468 | variables = scm_reverse_x (rvariables, SCM_UNDEFINED); | |
1469 | ||
1470 | { | |
1471 | const SCM let_body = SCM_CDR (cddr_expr); | |
430b8401 | 1472 | const SCM lambda_body = m_body (SCM_IM_LET, let_body); |
d6754c23 DH |
1473 | const SCM lambda_tail = scm_cons (variables, lambda_body); |
1474 | const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail); | |
1475 | ||
1476 | const SCM rvar = scm_list_1 (name); | |
1477 | const SCM init = scm_list_1 (lambda_form); | |
430b8401 | 1478 | const SCM body = m_body (SCM_IM_LET, scm_list_1 (name)); |
d6754c23 DH |
1479 | const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body)); |
1480 | const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail); | |
1481 | return scm_cons_source (expr, letrec_form, inits); | |
1482 | } | |
1483 | } | |
1484 | ||
1485 | /* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers | |
1486 | * i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */ | |
302c12b4 | 1487 | SCM |
d6754c23 | 1488 | scm_m_let (SCM expr, SCM env) |
0f2d19dd | 1489 | { |
d6754c23 DH |
1490 | SCM bindings; |
1491 | ||
1492 | const SCM cdr_expr = SCM_CDR (expr); | |
1493 | const long length = scm_ilength (cdr_expr); | |
1494 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1495 | ASSERT_SYNTAX (length >= 2, s_missing_expression, expr); | |
302c12b4 | 1496 | |
d6754c23 DH |
1497 | bindings = SCM_CAR (cdr_expr); |
1498 | if (SCM_SYMBOLP (bindings)) | |
26d5b9b4 | 1499 | { |
d6754c23 DH |
1500 | ASSERT_SYNTAX (length >= 3, s_missing_expression, expr); |
1501 | return memoize_named_let (expr, env); | |
26d5b9b4 | 1502 | } |
d6754c23 DH |
1503 | |
1504 | check_bindings (bindings, expr); | |
1505 | if (SCM_NULLP (bindings) || SCM_NULLP (SCM_CDR (bindings))) | |
26d5b9b4 | 1506 | { |
d6754c23 | 1507 | /* Special case: no bindings or single binding => let* is faster. */ |
430b8401 | 1508 | const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 | 1509 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env); |
26d5b9b4 | 1510 | } |
302c12b4 DH |
1511 | else |
1512 | { | |
d6754c23 DH |
1513 | /* plain let */ |
1514 | SCM rvariables; | |
1515 | SCM inits; | |
1516 | transform_bindings (bindings, expr, &rvariables, &inits); | |
26d5b9b4 | 1517 | |
302c12b4 | 1518 | { |
430b8401 | 1519 | const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr)); |
d6754c23 DH |
1520 | const SCM new_tail = scm_cons2 (rvariables, inits, new_body); |
1521 | SCM_SETCAR (expr, SCM_IM_LET); | |
1522 | SCM_SETCDR (expr, new_tail); | |
1523 | return expr; | |
302c12b4 DH |
1524 | } |
1525 | } | |
0f2d19dd JB |
1526 | } |
1527 | ||
1528 | ||
3b88ed2a | 1529 | SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar); |
9fbee57e | 1530 | SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar); |
1cc91f1b | 1531 | |
d6754c23 DH |
1532 | /* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers |
1533 | * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */ | |
9fbee57e | 1534 | SCM |
d6754c23 | 1535 | scm_m_letstar (SCM expr, SCM env SCM_UNUSED) |
0f2d19dd | 1536 | { |
d6754c23 DH |
1537 | SCM binding_idx; |
1538 | SCM new_bindings = SCM_EOL; | |
1539 | SCM new_body; | |
0f2d19dd | 1540 | |
d6754c23 DH |
1541 | const SCM cdr_expr = SCM_CDR (expr); |
1542 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1543 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
9fbee57e | 1544 | |
d6754c23 DH |
1545 | binding_idx = SCM_CAR (cdr_expr); |
1546 | check_bindings (binding_idx, expr); | |
1547 | ||
1548 | for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx)) | |
9fbee57e | 1549 | { |
d6754c23 DH |
1550 | const SCM binding = SCM_CAR (binding_idx); |
1551 | const SCM name = SCM_CAR (binding); | |
1552 | const SCM init = SCM_CADR (binding); | |
1553 | new_bindings = scm_cons2 (init, name, new_bindings); | |
9fbee57e | 1554 | } |
d6754c23 | 1555 | new_bindings = scm_reverse_x (new_bindings, SCM_UNDEFINED); |
9fbee57e | 1556 | |
430b8401 | 1557 | new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr)); |
d6754c23 | 1558 | return scm_cons2 (SCM_IM_LETSTAR, new_bindings, new_body); |
9fbee57e | 1559 | } |
b8229a3b | 1560 | |
0f2d19dd | 1561 | |
3b88ed2a | 1562 | SCM_SYNTAX(s_letrec, "letrec", scm_i_makbimacro, scm_m_letrec); |
9fbee57e | 1563 | SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec); |
1cc91f1b | 1564 | |
0f2d19dd | 1565 | SCM |
d6754c23 | 1566 | scm_m_letrec (SCM expr, SCM env) |
0f2d19dd | 1567 | { |
d6754c23 DH |
1568 | SCM bindings; |
1569 | ||
1570 | const SCM cdr_expr = SCM_CDR (expr); | |
1571 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1572 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1573 | ||
1574 | bindings = SCM_CAR (cdr_expr); | |
1575 | if (SCM_NULLP (bindings)) | |
9fbee57e | 1576 | { |
d6754c23 | 1577 | /* no bindings, let* is executed faster */ |
430b8401 | 1578 | SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1579 | return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env); |
9fbee57e DH |
1580 | } |
1581 | else | |
1582 | { | |
d6754c23 DH |
1583 | SCM rvariables; |
1584 | SCM inits; | |
1585 | SCM new_body; | |
1586 | ||
1587 | check_bindings (bindings, expr); | |
1588 | transform_bindings (bindings, expr, &rvariables, &inits); | |
430b8401 | 1589 | new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr)); |
d6754c23 | 1590 | return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body)); |
9fbee57e | 1591 | } |
0f2d19dd JB |
1592 | } |
1593 | ||
73b64342 | 1594 | |
3b88ed2a | 1595 | SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or); |
9fbee57e | 1596 | SCM_GLOBAL_SYMBOL (scm_sym_or, s_or); |
73b64342 MD |
1597 | |
1598 | SCM | |
21628685 | 1599 | scm_m_or (SCM expr, SCM env SCM_UNUSED) |
73b64342 | 1600 | { |
21628685 DH |
1601 | const SCM cdr_expr = SCM_CDR (expr); |
1602 | const long length = scm_ilength (cdr_expr); | |
1603 | ||
1604 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1605 | ||
1606 | if (length == 0) | |
1607 | { | |
1608 | /* Special case: (or) is replaced by #f. */ | |
1609 | return SCM_BOOL_F; | |
1610 | } | |
9fbee57e | 1611 | else |
21628685 DH |
1612 | { |
1613 | SCM_SETCAR (expr, SCM_IM_OR); | |
1614 | return expr; | |
1615 | } | |
73b64342 MD |
1616 | } |
1617 | ||
73b64342 | 1618 | |
9fbee57e DH |
1619 | SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote); |
1620 | SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote); | |
1621 | ||
1622 | /* Internal function to handle a quasiquotation: 'form' is the parameter in | |
1623 | * the call (quasiquotation form), 'env' is the environment where unquoted | |
1624 | * expressions will be evaluated, and 'depth' is the current quasiquotation | |
1625 | * nesting level and is known to be greater than zero. */ | |
1626 | static SCM | |
1627 | iqq (SCM form, SCM env, unsigned long int depth) | |
73b64342 | 1628 | { |
9fbee57e | 1629 | if (SCM_CONSP (form)) |
c96d76b8 | 1630 | { |
21628685 | 1631 | const SCM tmp = SCM_CAR (form); |
9fbee57e DH |
1632 | if (SCM_EQ_P (tmp, scm_sym_quasiquote)) |
1633 | { | |
21628685 DH |
1634 | const SCM args = SCM_CDR (form); |
1635 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1636 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1)); |
1637 | } | |
1638 | else if (SCM_EQ_P (tmp, scm_sym_unquote)) | |
1639 | { | |
21628685 DH |
1640 | const SCM args = SCM_CDR (form); |
1641 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1642 | if (depth - 1 == 0) |
1643 | return scm_eval_car (args, env); | |
1644 | else | |
1645 | return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1)); | |
1646 | } | |
1647 | else if (SCM_CONSP (tmp) | |
1648 | && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing)) | |
1649 | { | |
21628685 DH |
1650 | const SCM args = SCM_CDR (tmp); |
1651 | ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form); | |
9fbee57e DH |
1652 | if (depth - 1 == 0) |
1653 | { | |
21628685 DH |
1654 | const SCM list = scm_eval_car (args, env); |
1655 | const SCM rest = SCM_CDR (form); | |
1656 | ASSERT_SYNTAX_2 (scm_ilength (list) >= 0, | |
1657 | s_splicing, list, form); | |
9fbee57e DH |
1658 | return scm_append (scm_list_2 (list, iqq (rest, env, depth))); |
1659 | } | |
1660 | else | |
1661 | return scm_cons (iqq (SCM_CAR (form), env, depth - 1), | |
1662 | iqq (SCM_CDR (form), env, depth)); | |
1663 | } | |
1664 | else | |
1665 | return scm_cons (iqq (SCM_CAR (form), env, depth), | |
1666 | iqq (SCM_CDR (form), env, depth)); | |
1667 | } | |
1668 | else if (SCM_VECTORP (form)) | |
c96d76b8 | 1669 | { |
9fbee57e DH |
1670 | size_t i = SCM_VECTOR_LENGTH (form); |
1671 | SCM const *const data = SCM_VELTS (form); | |
1672 | SCM tmp = SCM_EOL; | |
1673 | while (i != 0) | |
1674 | tmp = scm_cons (data[--i], tmp); | |
1675 | scm_remember_upto_here_1 (form); | |
1676 | return scm_vector (iqq (tmp, env, depth)); | |
c96d76b8 | 1677 | } |
9fbee57e DH |
1678 | else |
1679 | return form; | |
1680 | } | |
1681 | ||
1682 | SCM | |
21628685 | 1683 | scm_m_quasiquote (SCM expr, SCM env) |
9fbee57e | 1684 | { |
21628685 DH |
1685 | const SCM cdr_expr = SCM_CDR (expr); |
1686 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1687 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1688 | return iqq (SCM_CAR (cdr_expr), env, 1); | |
9fbee57e DH |
1689 | } |
1690 | ||
1691 | ||
3b88ed2a | 1692 | SCM_SYNTAX (s_quote, "quote", scm_i_makbimacro, scm_m_quote); |
9fbee57e DH |
1693 | SCM_GLOBAL_SYMBOL (scm_sym_quote, s_quote); |
1694 | ||
1695 | SCM | |
21628685 | 1696 | scm_m_quote (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1697 | { |
21628685 DH |
1698 | SCM quotee; |
1699 | ||
1700 | const SCM cdr_expr = SCM_CDR (expr); | |
1701 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1702 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1703 | quotee = SCM_CAR (cdr_expr); | |
1704 | if (SCM_IMP (quotee) && !SCM_NULLP (quotee)) | |
1705 | return quotee; | |
1706 | else if (SCM_VECTORP (quotee)) | |
1707 | return quotee; | |
1708 | #if 0 | |
1709 | /* The following optimization would be possible if all variable references | |
1710 | * were resolved during memoization: */ | |
1711 | else if (SCM_SYMBOLP (quotee)) | |
1712 | return quotee; | |
1713 | #endif | |
1714 | SCM_SETCAR (expr, SCM_IM_QUOTE); | |
1715 | return expr; | |
9fbee57e DH |
1716 | } |
1717 | ||
1718 | ||
1719 | /* Will go into the RnRS module when Guile is factorized. | |
3b88ed2a | 1720 | SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */ |
9fbee57e DH |
1721 | static const char s_set_x[] = "set!"; |
1722 | SCM_GLOBAL_SYMBOL (scm_sym_set_x, s_set_x); | |
1723 | ||
1724 | SCM | |
82b3e2c6 | 1725 | scm_m_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1726 | { |
82b3e2c6 DH |
1727 | SCM variable; |
1728 | ||
1729 | const SCM cdr_expr = SCM_CDR (expr); | |
1730 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1731 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1732 | variable = SCM_CAR (cdr_expr); | |
1733 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
1734 | ||
1735 | SCM_SETCAR (expr, SCM_IM_SET_X); | |
1736 | return expr; | |
9fbee57e DH |
1737 | } |
1738 | ||
1739 | ||
1740 | /* Start of the memoizers for non-R5RS builtin macros. */ | |
1741 | ||
1742 | ||
3b88ed2a | 1743 | SCM_SYNTAX (s_atapply, "@apply", scm_i_makbimacro, scm_m_apply); |
9fbee57e DH |
1744 | SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply); |
1745 | SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1); | |
1746 | ||
1747 | SCM | |
82b3e2c6 | 1748 | scm_m_apply (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1749 | { |
82b3e2c6 DH |
1750 | const SCM cdr_expr = SCM_CDR (expr); |
1751 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1752 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_missing_expression, expr); | |
2e171178 | 1753 | |
82b3e2c6 DH |
1754 | SCM_SETCAR (expr, SCM_IM_APPLY); |
1755 | return expr; | |
1756 | } | |
2e171178 | 1757 | |
2e171178 | 1758 | |
3b88ed2a | 1759 | SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind); |
73b64342 | 1760 | |
82b3e2c6 DH |
1761 | /* FIXME: The following explanation should go into the documentation: */ |
1762 | /* (@bind ((var init) ...) body ...) will assign the values of the `init's to | |
1763 | * the global variables named by `var's (symbols, not evaluated), creating | |
1764 | * them if they don't exist, executes body, and then restores the previous | |
1765 | * values of the `var's. Additionally, whenever control leaves body, the | |
1766 | * values of the `var's are saved and restored when control returns. It is an | |
1767 | * error when a symbol appears more than once among the `var's. All `init's | |
1768 | * are evaluated before any `var' is set. | |
1769 | * | |
1770 | * Think of this as `let' for dynamic scope. | |
1771 | */ | |
1772 | ||
1773 | /* (@bind ((var1 exp1) ... (varn expn)) body ...) is memoized into | |
1774 | * (#@bind ((varn ... var1) . (exp1 ... expn)) body ...). | |
1775 | * | |
1776 | * FIXME - also implement `@bind*'. | |
1777 | */ | |
73b64342 | 1778 | SCM |
82b3e2c6 | 1779 | scm_m_atbind (SCM expr, SCM env) |
73b64342 | 1780 | { |
82b3e2c6 DH |
1781 | SCM bindings; |
1782 | SCM rvariables; | |
1783 | SCM inits; | |
1784 | SCM variable_idx; | |
2e171178 | 1785 | |
82b3e2c6 | 1786 | const SCM top_level = scm_env_top_level (env); |
73b64342 | 1787 | |
82b3e2c6 DH |
1788 | const SCM cdr_expr = SCM_CDR (expr); |
1789 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1790 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr); | |
1791 | bindings = SCM_CAR (cdr_expr); | |
1792 | check_bindings (bindings, expr); | |
1793 | transform_bindings (bindings, expr, &rvariables, &inits); | |
1794 | ||
1795 | for (variable_idx = rvariables; | |
1796 | !SCM_NULLP (variable_idx); | |
1797 | variable_idx = SCM_CDR (variable_idx)) | |
73b64342 | 1798 | { |
82b3e2c6 DH |
1799 | /* The first call to scm_sym2var will look beyond the current module, |
1800 | * while the second call wont. */ | |
1801 | const SCM variable = SCM_CAR (variable_idx); | |
1802 | SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F); | |
1803 | if (SCM_FALSEP (new_variable)) | |
1804 | new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T); | |
1805 | SCM_SETCAR (variable_idx, new_variable); | |
73b64342 | 1806 | } |
82b3e2c6 DH |
1807 | |
1808 | SCM_SETCAR (expr, SCM_IM_BIND); | |
1809 | SCM_SETCAR (cdr_expr, scm_cons (rvariables, inits)); | |
1810 | return expr; | |
73b64342 | 1811 | } |
73b64342 | 1812 | |
b0c5d67b | 1813 | |
3b88ed2a | 1814 | SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont); |
9fbee57e DH |
1815 | SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc); |
1816 | ||
9fbee57e | 1817 | SCM |
da48db62 | 1818 | scm_m_cont (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1819 | { |
da48db62 DH |
1820 | const SCM cdr_expr = SCM_CDR (expr); |
1821 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1822 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
1823 | ||
1824 | SCM_SETCAR (expr, SCM_IM_CONT); | |
1825 | return expr; | |
b0c5d67b | 1826 | } |
b0c5d67b DH |
1827 | |
1828 | ||
3b88ed2a | 1829 | SCM_SYNTAX (s_at_call_with_values, "@call-with-values", scm_i_makbimacro, scm_m_at_call_with_values); |
9fbee57e | 1830 | SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values); |
b0c5d67b DH |
1831 | |
1832 | SCM | |
da48db62 | 1833 | scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED) |
b0c5d67b | 1834 | { |
da48db62 DH |
1835 | const SCM cdr_expr = SCM_CDR (expr); |
1836 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1837 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1838 | ||
1839 | SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES); | |
1840 | return expr; | |
b0c5d67b | 1841 | } |
b0c5d67b DH |
1842 | |
1843 | ||
3b88ed2a | 1844 | SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future); |
9fbee57e | 1845 | SCM_GLOBAL_SYMBOL (scm_sym_future, s_future); |
a513ead3 | 1846 | |
9fbee57e DH |
1847 | /* Like promises, futures are implemented as closures with an empty |
1848 | * parameter list. Thus, (future <expression>) is transformed into | |
1849 | * (#@future '() <expression>), where the empty list represents the | |
1850 | * empty parameter list. This representation allows for easy creation | |
1851 | * of the closure during evaluation. */ | |
a513ead3 | 1852 | SCM |
8ae95199 | 1853 | scm_m_future (SCM expr, SCM env) |
a513ead3 | 1854 | { |
8ae95199 DH |
1855 | const SCM new_expr = memoize_as_thunk_prototype (expr, env); |
1856 | SCM_SETCAR (new_expr, SCM_IM_FUTURE); | |
1857 | return new_expr; | |
a513ead3 MV |
1858 | } |
1859 | ||
9fbee57e | 1860 | |
3b88ed2a | 1861 | SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x); |
9fbee57e DH |
1862 | SCM_SYMBOL (scm_sym_setter, "setter"); |
1863 | ||
1864 | SCM | |
da48db62 | 1865 | scm_m_generalized_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1866 | { |
da48db62 DH |
1867 | SCM target; |
1868 | ||
1869 | const SCM cdr_expr = SCM_CDR (expr); | |
1870 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1871 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1872 | ||
1873 | target = SCM_CAR (cdr_expr); | |
1874 | if (!SCM_CONSP (target)) | |
1875 | { | |
1876 | /* R5RS usage */ | |
1877 | return scm_m_set_x (expr, env); | |
1878 | } | |
9fbee57e | 1879 | else |
da48db62 DH |
1880 | { |
1881 | /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */ | |
1882 | ||
1883 | const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target)); | |
1884 | const SCM setter_proc = scm_cons_source (expr, scm_sym_setter, setter_proc_tail); | |
1885 | ||
1886 | const SCM cddr_expr = SCM_CDR (cdr_expr); | |
1887 | const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target), cddr_expr)); | |
1888 | ||
1889 | SCM_SETCAR (expr, setter_proc); | |
1890 | SCM_SETCDR (expr, setter_args); | |
1891 | return expr; | |
1892 | } | |
9fbee57e DH |
1893 | } |
1894 | ||
1895 | ||
a4aa2134 DH |
1896 | /* @slot-ref is bound privately in the (oop goops) module from goops.c. As |
1897 | * soon as the module system allows us to more freely create bindings in | |
1898 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1899 | * moved here. */ | |
9fbee57e | 1900 | SCM |
9a848baf | 1901 | scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1902 | { |
9a848baf DH |
1903 | SCM slot_nr; |
1904 | ||
1905 | const SCM cdr_expr = SCM_CDR (expr); | |
1906 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1907 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr); | |
1908 | slot_nr = SCM_CADR (cdr_expr); | |
1909 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
9fbee57e | 1910 | |
9a848baf DH |
1911 | SCM_SETCAR (expr, SCM_IM_SLOT_REF); |
1912 | return expr; | |
1913 | } | |
9fbee57e | 1914 | |
9fbee57e | 1915 | |
a4aa2134 DH |
1916 | /* @slot-set! is bound privately in the (oop goops) module from goops.c. As |
1917 | * soon as the module system allows us to more freely create bindings in | |
1918 | * arbitrary modules during the startup phase, the code from goops.c should be | |
1919 | * moved here. */ | |
9fbee57e | 1920 | SCM |
9a848baf | 1921 | scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1922 | { |
9a848baf DH |
1923 | SCM slot_nr; |
1924 | ||
1925 | const SCM cdr_expr = SCM_CDR (expr); | |
1926 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1927 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr); | |
1928 | slot_nr = SCM_CADR (cdr_expr); | |
1929 | ASSERT_SYNTAX_2 (SCM_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr); | |
1930 | ||
1931 | SCM_SETCAR (expr, SCM_IM_SLOT_SET_X); | |
1932 | return expr; | |
9fbee57e | 1933 | } |
9fbee57e DH |
1934 | |
1935 | ||
1936 | #if SCM_ENABLE_ELISP | |
1937 | ||
70c1c108 DH |
1938 | static const char s_defun[] = "Symbol's function definition is void"; |
1939 | ||
3b88ed2a | 1940 | SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond); |
9fbee57e | 1941 | |
70c1c108 DH |
1942 | /* nil-cond expressions have the form |
1943 | * (nil-cond COND VAL COND VAL ... ELSEVAL) */ | |
9fbee57e | 1944 | SCM |
70c1c108 | 1945 | scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1946 | { |
70c1c108 DH |
1947 | const long length = scm_ilength (SCM_CDR (expr)); |
1948 | ASSERT_SYNTAX (length >= 0, s_bad_expression, expr); | |
1949 | ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr); | |
1950 | ||
1951 | SCM_SETCAR (expr, SCM_IM_NIL_COND); | |
1952 | return expr; | |
9fbee57e DH |
1953 | } |
1954 | ||
1955 | ||
3b88ed2a | 1956 | SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop); |
9fbee57e | 1957 | |
70c1c108 DH |
1958 | /* The @fop-macro handles procedure and macro applications for elisp. The |
1959 | * input expression must have the form | |
1960 | * (@fop <var> (transformer-macro <expr> ...)) | |
1961 | * where <var> must be a symbol. The expression is transformed into the | |
1962 | * memoized form of either | |
1963 | * (apply <un-aliased var> (transformer-macro <expr> ...)) | |
1964 | * if the value of var (across all aliasing) is not a macro, or | |
1965 | * (<un-aliased var> <expr> ...) | |
1966 | * if var is a macro. */ | |
9fbee57e | 1967 | SCM |
70c1c108 | 1968 | scm_m_atfop (SCM expr, SCM env SCM_UNUSED) |
9fbee57e | 1969 | { |
70c1c108 DH |
1970 | SCM location; |
1971 | SCM symbol; | |
1972 | ||
1973 | const SCM cdr_expr = SCM_CDR (expr); | |
1974 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
1975 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr); | |
1976 | ||
1977 | symbol = SCM_CAR (cdr_expr); | |
1978 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (symbol), s_bad_variable, symbol, expr); | |
1979 | ||
1980 | location = scm_symbol_fref (symbol); | |
1981 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
1982 | ||
1983 | /* The elisp function `defalias' allows to define aliases for symbols. To | |
1984 | * look up such definitions, the chain of symbol definitions has to be | |
1985 | * followed up to the terminal symbol. */ | |
1986 | while (SCM_SYMBOLP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 1987 | { |
70c1c108 DH |
1988 | const SCM alias = SCM_VARIABLE_REF (location); |
1989 | location = scm_symbol_fref (alias); | |
1990 | ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr); | |
9fbee57e | 1991 | } |
70c1c108 DH |
1992 | |
1993 | /* Memoize the value location belonging to the terminal symbol. */ | |
1994 | SCM_SETCAR (cdr_expr, location); | |
1995 | ||
1996 | if (!SCM_MACROP (SCM_VARIABLE_REF (location))) | |
9fbee57e | 1997 | { |
70c1c108 DH |
1998 | /* Since the location does not contain a macro, the form is a procedure |
1999 | * application. Replace `@fop' by `@apply' and transform the expression | |
2000 | * including the `transformer-macro'. */ | |
2001 | SCM_SETCAR (expr, SCM_IM_APPLY); | |
2002 | return expr; | |
2003 | } | |
2004 | else | |
2005 | { | |
2006 | /* Since the location contains a macro, the arguments should not be | |
2007 | * transformed, so the `transformer-macro' is cut out. The resulting | |
2008 | * expression starts with the memoized variable, that is at the cdr of | |
2009 | * the input expression. */ | |
2010 | SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr)); | |
2011 | return cdr_expr; | |
9fbee57e | 2012 | } |
9fbee57e DH |
2013 | } |
2014 | ||
2015 | #endif /* SCM_ENABLE_ELISP */ | |
2016 | ||
2017 | ||
f58c472a DH |
2018 | /* Start of the memoizers for deprecated macros. */ |
2019 | ||
2020 | ||
2021 | #if (SCM_ENABLE_DEPRECATED == 1) | |
2022 | ||
2023 | SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine); | |
2024 | ||
2025 | SCM | |
70c1c108 | 2026 | scm_m_undefine (SCM expr, SCM env) |
f58c472a | 2027 | { |
70c1c108 DH |
2028 | SCM variable; |
2029 | SCM location; | |
2030 | ||
2031 | const SCM cdr_expr = SCM_CDR (expr); | |
2032 | ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr); | |
2033 | ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr); | |
2034 | ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr); | |
2035 | ||
2036 | variable = SCM_CAR (cdr_expr); | |
2037 | ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr); | |
2038 | location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F); | |
2039 | ASSERT_SYNTAX_2 (!SCM_FALSEP (location) | |
2040 | && !SCM_UNBNDP (SCM_VARIABLE_REF (location)), | |
2041 | "variable already unbound ", variable, expr); | |
2042 | SCM_VARIABLE_SET (location, SCM_UNDEFINED); | |
f58c472a | 2043 | return SCM_UNSPECIFIED; |
f58c472a DH |
2044 | } |
2045 | ||
2046 | #endif | |
2047 | ||
2048 | ||
26d5b9b4 MD |
2049 | SCM |
2050 | scm_macroexp (SCM x, SCM env) | |
2051 | { | |
86d31dfe | 2052 | SCM res, proc, orig_sym; |
26d5b9b4 MD |
2053 | |
2054 | /* Don't bother to produce error messages here. We get them when we | |
2055 | eventually execute the code for real. */ | |
2056 | ||
2057 | macro_tail: | |
86d31dfe MV |
2058 | orig_sym = SCM_CAR (x); |
2059 | if (!SCM_SYMBOLP (orig_sym)) | |
26d5b9b4 MD |
2060 | return x; |
2061 | ||
26d5b9b4 MD |
2062 | { |
2063 | SCM *proc_ptr = scm_lookupcar1 (x, env, 0); | |
2064 | if (proc_ptr == NULL) | |
2065 | { | |
2066 | /* We have lost the race. */ | |
2067 | goto macro_tail; | |
2068 | } | |
2069 | proc = *proc_ptr; | |
2070 | } | |
26d5b9b4 MD |
2071 | |
2072 | /* Only handle memoizing macros. `Acros' and `macros' are really | |
2073 | special forms and should not be evaluated here. */ | |
2074 | ||
3b88ed2a DH |
2075 | if (!SCM_MACROP (proc) |
2076 | || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc))) | |
26d5b9b4 MD |
2077 | return x; |
2078 | ||
86d31dfe | 2079 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */ |
fdc28395 | 2080 | res = scm_call_2 (SCM_MACRO_CODE (proc), x, env); |
26d5b9b4 MD |
2081 | |
2082 | if (scm_ilength (res) <= 0) | |
8ea46249 | 2083 | res = scm_list_2 (SCM_IM_BEGIN, res); |
26d5b9b4 | 2084 | |
26d5b9b4 MD |
2085 | SCM_DEFER_INTS; |
2086 | SCM_SETCAR (x, SCM_CAR (res)); | |
2087 | SCM_SETCDR (x, SCM_CDR (res)); | |
2088 | SCM_ALLOW_INTS; | |
2089 | ||
2090 | goto macro_tail; | |
2091 | } | |
73b64342 | 2092 | |
a44a9715 DH |
2093 | #define SCM_BIT7(x) (127 & SCM_UNPACK (x)) |
2094 | ||
2095 | /* A function object to implement "apply" for non-closure functions. */ | |
2096 | static SCM f_apply; | |
2097 | /* An endless list consisting of #<undefined> objects: */ | |
2098 | static SCM undefineds; | |
2099 | ||
60a49842 | 2100 | |
6dbd0af5 MD |
2101 | /* scm_unmemocopy takes a memoized expression together with its |
2102 | * environment and rewrites it to its original form. Thus, it is the | |
2103 | * inversion of the rewrite rules above. The procedure is not | |
2104 | * optimized for speed. It's used in scm_iprin1 when printing the | |
220ff1eb MD |
2105 | * code of a closure, in scm_procedure_source, in display_frame when |
2106 | * generating the source for a stackframe in a backtrace, and in | |
2107 | * display_expression. | |
86d31dfe | 2108 | * |
c96d76b8 | 2109 | * Unmemoizing is not a reliable process. You cannot in general |
86d31dfe MV |
2110 | * expect to get the original source back. |
2111 | * | |
2112 | * However, GOOPS currently relies on this for method compilation. | |
2113 | * This ought to change. | |
26d5b9b4 MD |
2114 | */ |
2115 | ||
8ea46249 | 2116 | static SCM |
60a49842 | 2117 | build_binding_list (SCM rnames, SCM rinits) |
8ea46249 DH |
2118 | { |
2119 | SCM bindings = SCM_EOL; | |
60a49842 | 2120 | while (!SCM_NULLP (rnames)) |
8ea46249 | 2121 | { |
60a49842 | 2122 | SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits)); |
8ea46249 | 2123 | bindings = scm_cons (binding, bindings); |
60a49842 DH |
2124 | rnames = SCM_CDR (rnames); |
2125 | rinits = SCM_CDR (rinits); | |
8ea46249 DH |
2126 | } |
2127 | return bindings; | |
2128 | } | |
2129 | ||
60a49842 DH |
2130 | |
2131 | SCM_SYMBOL (sym_three_question_marks, "???"); | |
2132 | ||
2133 | #define unmemocar scm_unmemocar | |
2134 | ||
2135 | SCM | |
2136 | scm_unmemocar (SCM form, SCM env) | |
2137 | { | |
2138 | if (!SCM_CONSP (form)) | |
2139 | return form; | |
2140 | else | |
2141 | { | |
2142 | SCM c = SCM_CAR (form); | |
2143 | if (SCM_VARIABLEP (c)) | |
2144 | { | |
2145 | SCM sym = scm_module_reverse_lookup (scm_env_module (env), c); | |
2146 | if (SCM_FALSEP (sym)) | |
2147 | sym = sym_three_question_marks; | |
2148 | SCM_SETCAR (form, sym); | |
2149 | } | |
2150 | else if (SCM_ILOCP (c)) | |
2151 | { | |
2152 | unsigned long int ir; | |
2153 | ||
2154 | for (ir = SCM_IFRAME (c); ir != 0; --ir) | |
2155 | env = SCM_CDR (env); | |
2156 | env = SCM_CAAR (env); | |
2157 | for (ir = SCM_IDIST (c); ir != 0; --ir) | |
2158 | env = SCM_CDR (env); | |
2159 | SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env)); | |
2160 | } | |
2161 | return form; | |
2162 | } | |
2163 | } | |
2164 | ||
6dbd0af5 | 2165 | static SCM |
1bbd0b84 | 2166 | unmemocopy (SCM x, SCM env) |
6dbd0af5 MD |
2167 | { |
2168 | SCM ls, z; | |
6dbd0af5 | 2169 | SCM p; |
21628685 DH |
2170 | |
2171 | if (SCM_VECTORP (x)) | |
2172 | { | |
2173 | return scm_list_2 (scm_sym_quote, x); | |
2174 | } | |
2175 | else if (!SCM_CONSP (x)) | |
6dbd0af5 | 2176 | return x; |
21628685 | 2177 | |
6dbd0af5 | 2178 | p = scm_whash_lookup (scm_source_whash, x); |
8ea46249 | 2179 | switch (SCM_ITAG7 (SCM_CAR (x))) |
6dbd0af5 | 2180 | { |
1b43d24c | 2181 | case SCM_BIT7 (SCM_IM_AND): |
2f0d1375 | 2182 | ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED); |
6dbd0af5 | 2183 | break; |
1b43d24c | 2184 | case SCM_BIT7 (SCM_IM_BEGIN): |
2f0d1375 | 2185 | ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED); |
6dbd0af5 | 2186 | break; |
1b43d24c | 2187 | case SCM_BIT7 (SCM_IM_CASE): |
2f0d1375 | 2188 | ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED); |
6dbd0af5 | 2189 | break; |
1b43d24c | 2190 | case SCM_BIT7 (SCM_IM_COND): |
2f0d1375 | 2191 | ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED); |
6dbd0af5 | 2192 | break; |
1b43d24c | 2193 | case SCM_BIT7 (SCM_IM_DO): |
6dbd0af5 | 2194 | { |
e681d187 DH |
2195 | /* format: (#@do (i1 ... ik) (nk nk-1 ...) (test) (body) s1 ... sk), |
2196 | * where ix is an initializer for a local variable, nx is the name of | |
8ea46249 DH |
2197 | * the local variable, test is the test clause of the do loop, body is |
2198 | * the body of the do loop and sx are the step clauses for the local | |
2199 | * variables. */ | |
2200 | SCM names, inits, test, memoized_body, steps, bindings; | |
2201 | ||
6dbd0af5 | 2202 | x = SCM_CDR (x); |
8ea46249 | 2203 | inits = scm_reverse (unmemocopy (SCM_CAR (x), env)); |
e681d187 DH |
2204 | x = SCM_CDR (x); |
2205 | names = SCM_CAR (x); | |
821f18a4 | 2206 | env = SCM_EXTEND_ENV (names, SCM_EOL, env); |
6dbd0af5 | 2207 | x = SCM_CDR (x); |
8ea46249 DH |
2208 | test = unmemocopy (SCM_CAR (x), env); |
2209 | x = SCM_CDR (x); | |
2210 | memoized_body = SCM_CAR (x); | |
2211 | x = SCM_CDR (x); | |
2212 | steps = scm_reverse (unmemocopy (x, env)); | |
2213 | ||
26d5b9b4 | 2214 | /* build transformed binding list */ |
8ea46249 DH |
2215 | bindings = SCM_EOL; |
2216 | while (!SCM_NULLP (names)) | |
6dbd0af5 | 2217 | { |
8ea46249 DH |
2218 | SCM name = SCM_CAR (names); |
2219 | SCM init = SCM_CAR (inits); | |
2220 | SCM step = SCM_CAR (steps); | |
2221 | step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step); | |
2222 | ||
2223 | bindings = scm_cons (scm_cons2 (name, init, step), bindings); | |
2224 | ||
2225 | names = SCM_CDR (names); | |
2226 | inits = SCM_CDR (inits); | |
2227 | steps = SCM_CDR (steps); | |
6dbd0af5 | 2228 | } |
8ea46249 DH |
2229 | z = scm_cons (test, SCM_UNSPECIFIED); |
2230 | ls = scm_cons2 (scm_sym_do, bindings, z); | |
2231 | ||
2232 | x = scm_cons (SCM_BOOL_F, memoized_body); | |
2233 | break; | |
2234 | } | |
1b43d24c | 2235 | case SCM_BIT7 (SCM_IM_IF): |
8ea46249 DH |
2236 | ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED); |
2237 | break; | |
1b43d24c | 2238 | case SCM_BIT7 (SCM_IM_LET): |
8ea46249 DH |
2239 | { |
2240 | /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...), | |
2241 | * where nx is the name of a local variable, ix is an initializer for | |
2242 | * the local variable and by are the body clauses. */ | |
60a49842 | 2243 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2244 | |
2245 | x = SCM_CDR (x); | |
60a49842 | 2246 | rnames = SCM_CAR (x); |
8ea46249 | 2247 | x = SCM_CDR (x); |
60a49842 DH |
2248 | rinits = scm_reverse (unmemocopy (SCM_CAR (x), env)); |
2249 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
8ea46249 | 2250 | |
60a49842 | 2251 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2252 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2253 | ls = scm_cons (scm_sym_let, z); | |
2254 | break; | |
2255 | } | |
1b43d24c | 2256 | case SCM_BIT7 (SCM_IM_LETREC): |
8ea46249 | 2257 | { |
60a49842 DH |
2258 | /* format: (#@letrec (vn ... v2 v1) (i1 i2 ... in) b1 ...), |
2259 | * where vx is the name of a local variable, ix is an initializer for | |
8ea46249 | 2260 | * the local variable and by are the body clauses. */ |
60a49842 | 2261 | SCM rnames, rinits, bindings; |
8ea46249 DH |
2262 | |
2263 | x = SCM_CDR (x); | |
60a49842 DH |
2264 | rnames = SCM_CAR (x); |
2265 | env = SCM_EXTEND_ENV (rnames, SCM_EOL, env); | |
8ea46249 | 2266 | x = SCM_CDR (x); |
60a49842 | 2267 | rinits = scm_reverse (unmemocopy (SCM_CAR (x), env)); |
8ea46249 | 2268 | |
60a49842 | 2269 | bindings = build_binding_list (rnames, rinits); |
8ea46249 DH |
2270 | z = scm_cons (bindings, SCM_UNSPECIFIED); |
2271 | ls = scm_cons (scm_sym_letrec, z); | |
6dbd0af5 MD |
2272 | break; |
2273 | } | |
1b43d24c | 2274 | case SCM_BIT7 (SCM_IM_LETSTAR): |
6dbd0af5 MD |
2275 | { |
2276 | SCM b, y; | |
2277 | x = SCM_CDR (x); | |
2278 | b = SCM_CAR (x); | |
2279 | y = SCM_EOL; | |
2280 | if SCM_IMP (b) | |
2281 | { | |
821f18a4 | 2282 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
6dbd0af5 MD |
2283 | goto letstar; |
2284 | } | |
2285 | y = z = scm_acons (SCM_CAR (b), | |
2286 | unmemocar ( | |
8ea46249 | 2287 | scm_cons (unmemocopy (SCM_CADR (b), env), SCM_EOL), env), |
6dbd0af5 | 2288 | SCM_UNSPECIFIED); |
821f18a4 | 2289 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2290 | b = SCM_CDDR (b); |
6dbd0af5 MD |
2291 | if (SCM_IMP (b)) |
2292 | { | |
2293 | SCM_SETCDR (y, SCM_EOL); | |
05b15362 DH |
2294 | z = scm_cons (y, SCM_UNSPECIFIED); |
2295 | ls = scm_cons (scm_sym_let, z); | |
6dbd0af5 MD |
2296 | break; |
2297 | } | |
2298 | do | |
2299 | { | |
a23afe53 MD |
2300 | SCM_SETCDR (z, scm_acons (SCM_CAR (b), |
2301 | unmemocar ( | |
8ea46249 | 2302 | scm_list_1 (unmemocopy (SCM_CADR (b), env)), env), |
a23afe53 MD |
2303 | SCM_UNSPECIFIED)); |
2304 | z = SCM_CDR (z); | |
821f18a4 | 2305 | env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env); |
8ea46249 | 2306 | b = SCM_CDDR (b); |
6dbd0af5 | 2307 | } |
ff467021 | 2308 | while (SCM_NIMP (b)); |
a23afe53 | 2309 | SCM_SETCDR (z, SCM_EOL); |
6dbd0af5 | 2310 | letstar: |
05b15362 DH |
2311 | z = scm_cons (y, SCM_UNSPECIFIED); |
2312 | ls = scm_cons (scm_sym_letstar, z); | |
6dbd0af5 MD |
2313 | break; |
2314 | } | |
1b43d24c | 2315 | case SCM_BIT7 (SCM_IM_OR): |
2f0d1375 | 2316 | ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED); |
6dbd0af5 | 2317 | break; |
1b43d24c | 2318 | case SCM_BIT7 (SCM_IM_LAMBDA): |
6dbd0af5 | 2319 | x = SCM_CDR (x); |
8ea46249 DH |
2320 | z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED); |
2321 | ls = scm_cons (scm_sym_lambda, z); | |
821f18a4 | 2322 | env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env); |
6dbd0af5 | 2323 | break; |
1b43d24c | 2324 | case SCM_BIT7 (SCM_IM_QUOTE): |
2f0d1375 | 2325 | ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED); |
6dbd0af5 | 2326 | break; |
1b43d24c | 2327 | case SCM_BIT7 (SCM_IM_SET_X): |
89efbff4 | 2328 | ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED); |
6dbd0af5 | 2329 | break; |
1b43d24c | 2330 | case SCM_BIT7 (SCM_MAKISYM (0)): |
6dbd0af5 | 2331 | z = SCM_CAR (x); |
ff467021 | 2332 | switch (SCM_ISYMNUM (z)) |
6dbd0af5 | 2333 | { |
22f2cf2d DH |
2334 | case (SCM_ISYMNUM (SCM_IM_DEFINE)): |
2335 | { | |
2336 | SCM n; | |
2337 | x = SCM_CDR (x); | |
2338 | n = SCM_CAR (x); | |
2339 | z = scm_cons (n, SCM_UNSPECIFIED); | |
2340 | ls = scm_cons (scm_sym_define, z); | |
2341 | if (!SCM_NULLP (env)) | |
2342 | env = scm_cons (scm_cons (scm_cons (n, SCM_CAAR (env)), | |
2343 | SCM_CDAR (env)), | |
2344 | SCM_CDR (env)); | |
2345 | break; | |
2346 | } | |
6dbd0af5 | 2347 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
2f0d1375 | 2348 | ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED); |
6dbd0af5 MD |
2349 | goto loop; |
2350 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
2f0d1375 | 2351 | ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED); |
6dbd0af5 | 2352 | goto loop; |
a570e93a MD |
2353 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
2354 | ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED); | |
2355 | x = SCM_CDR (x); | |
2356 | goto loop; | |
28d52ebb | 2357 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
ebf9b47c | 2358 | ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED); |
28d52ebb MD |
2359 | x = SCM_CDR (x); |
2360 | goto loop; | |
a513ead3 MV |
2361 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
2362 | ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED); | |
2363 | goto loop; | |
2a6f7afe DH |
2364 | case (SCM_ISYMNUM (SCM_IM_ELSE)): |
2365 | ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED); | |
2366 | goto loop; | |
6dbd0af5 | 2367 | default: |
fa888178 | 2368 | /* appease the Sun compiler god: */ ; |
6dbd0af5 | 2369 | } |
6dbd0af5 MD |
2370 | default: |
2371 | ls = z = unmemocar (scm_cons (unmemocopy (SCM_CAR (x), env), | |
2372 | SCM_UNSPECIFIED), | |
2373 | env); | |
2374 | } | |
2375 | loop: | |
8c494e99 DH |
2376 | x = SCM_CDR (x); |
2377 | while (SCM_CONSP (x)) | |
a23afe53 | 2378 | { |
8c494e99 DH |
2379 | SCM form = SCM_CAR (x); |
2380 | if (!SCM_ISYMP (form)) | |
2381 | { | |
2382 | SCM copy = scm_cons (unmemocopy (form, env), SCM_UNSPECIFIED); | |
2383 | SCM_SETCDR (z, unmemocar (copy, env)); | |
2384 | z = SCM_CDR (z); | |
2385 | } | |
609a8b86 DH |
2386 | else if (SCM_EQ_P (form, SCM_IM_ARROW)) |
2387 | { | |
2388 | SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED)); | |
2389 | z = SCM_CDR (z); | |
2390 | } | |
8c494e99 | 2391 | x = SCM_CDR (x); |
a23afe53 MD |
2392 | } |
2393 | SCM_SETCDR (z, x); | |
01f11e02 | 2394 | if (!SCM_FALSEP (p)) |
6dbd0af5 | 2395 | scm_whash_insert (scm_source_whash, ls, p); |
6dbd0af5 MD |
2396 | return ls; |
2397 | } | |
2398 | ||
1cc91f1b | 2399 | |
6dbd0af5 | 2400 | SCM |
6e8d25a6 | 2401 | scm_unmemocopy (SCM x, SCM env) |
6dbd0af5 | 2402 | { |
01f11e02 | 2403 | if (!SCM_NULLP (env)) |
6dbd0af5 MD |
2404 | /* Make a copy of the lowest frame to protect it from |
2405 | modifications by SCM_IM_DEFINE */ | |
2406 | return unmemocopy (x, scm_cons (SCM_CAR (env), SCM_CDR (env))); | |
2407 | else | |
2408 | return unmemocopy (x, env); | |
2409 | } | |
2410 | ||
1cc91f1b | 2411 | |
0f2d19dd | 2412 | int |
6e8d25a6 | 2413 | scm_badargsp (SCM formals, SCM args) |
0f2d19dd | 2414 | { |
6a0f6ff3 | 2415 | while (!SCM_NULLP (formals)) |
0f2d19dd | 2416 | { |
01f11e02 | 2417 | if (!SCM_CONSP (formals)) |
ff467021 | 2418 | return 0; |
6a0f6ff3 | 2419 | if (SCM_NULLP (args)) |
ff467021 | 2420 | return 1; |
0f2d19dd JB |
2421 | formals = SCM_CDR (formals); |
2422 | args = SCM_CDR (args); | |
2423 | } | |
01f11e02 | 2424 | return !SCM_NULLP (args) ? 1 : 0; |
0f2d19dd | 2425 | } |
a392ee15 | 2426 | |
0f2d19dd | 2427 | \f |
6dbd0af5 | 2428 | SCM |
6e8d25a6 | 2429 | scm_eval_args (SCM l, SCM env, SCM proc) |
6dbd0af5 | 2430 | { |
680ed4a8 | 2431 | SCM results = SCM_EOL, *lloc = &results, res; |
904a077d | 2432 | while (SCM_CONSP (l)) |
6dbd0af5 | 2433 | { |
680ed4a8 | 2434 | res = EVALCAR (l, env); |
904a077d | 2435 | |
8ea46249 | 2436 | *lloc = scm_list_1 (res); |
a23afe53 | 2437 | lloc = SCM_CDRLOC (*lloc); |
6dbd0af5 MD |
2438 | l = SCM_CDR (l); |
2439 | } | |
22a52da1 | 2440 | if (!SCM_NULLP (l)) |
904a077d | 2441 | scm_wrong_num_args (proc); |
680ed4a8 | 2442 | return results; |
6dbd0af5 | 2443 | } |
c4ac4d88 | 2444 | |
d0b07b5d | 2445 | |
9de33deb MD |
2446 | SCM |
2447 | scm_eval_body (SCM code, SCM env) | |
2448 | { | |
2449 | SCM next; | |
2450 | again: | |
01f11e02 DH |
2451 | next = SCM_CDR (code); |
2452 | while (!SCM_NULLP (next)) | |
9de33deb MD |
2453 | { |
2454 | if (SCM_IMP (SCM_CAR (code))) | |
2455 | { | |
2456 | if (SCM_ISYMP (SCM_CAR (code))) | |
2457 | { | |
28d52ebb | 2458 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2459 | /* check for race condition */ |
2460 | if (SCM_ISYMP (SCM_CAR (code))) | |
328dc9a3 | 2461 | code = m_expand_body (code, env); |
28d52ebb | 2462 | scm_rec_mutex_unlock (&source_mutex); |
9de33deb MD |
2463 | goto again; |
2464 | } | |
2465 | } | |
2466 | else | |
2467 | SCM_XEVAL (SCM_CAR (code), env); | |
2468 | code = next; | |
01f11e02 | 2469 | next = SCM_CDR (code); |
9de33deb MD |
2470 | } |
2471 | return SCM_XEVALCAR (code, env); | |
2472 | } | |
2473 | ||
0f2d19dd JB |
2474 | #endif /* !DEVAL */ |
2475 | ||
6dbd0af5 MD |
2476 | |
2477 | /* SECTION: This code is specific for the debugging support. One | |
2478 | * branch is read when DEVAL isn't defined, the other when DEVAL is | |
2479 | * defined. | |
2480 | */ | |
2481 | ||
2482 | #ifndef DEVAL | |
2483 | ||
2484 | #define SCM_APPLY scm_apply | |
2485 | #define PREP_APPLY(proc, args) | |
2486 | #define ENTER_APPLY | |
ddea3325 | 2487 | #define RETURN(x) do { return x; } while (0) |
b7ff98dd MD |
2488 | #ifdef STACK_CHECKING |
2489 | #ifndef NO_CEVAL_STACK_CHECKING | |
2490 | #define EVAL_STACK_CHECKING | |
2491 | #endif | |
6dbd0af5 MD |
2492 | #endif |
2493 | ||
2494 | #else /* !DEVAL */ | |
2495 | ||
0f2d19dd JB |
2496 | #undef SCM_CEVAL |
2497 | #define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */ | |
2498 | #undef SCM_APPLY | |
2499 | #define SCM_APPLY scm_dapply | |
6dbd0af5 MD |
2500 | #undef PREP_APPLY |
2501 | #define PREP_APPLY(p, l) \ | |
2502 | { ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; } | |
2503 | #undef ENTER_APPLY | |
2504 | #define ENTER_APPLY \ | |
d3a6bc94 | 2505 | do { \ |
b7ff98dd | 2506 | SCM_SET_ARGSREADY (debug);\ |
5132eef0 | 2507 | if (scm_check_apply_p && SCM_TRAPS_P)\ |
b7ff98dd | 2508 | if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\ |
6dbd0af5 | 2509 | {\ |
156dcb09 | 2510 | SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \ |
c6a4fbce | 2511 | SCM_SET_TRACED_FRAME (debug); \ |
d95c0b76 | 2512 | SCM_TRAPS_P = 0;\ |
b7ff98dd | 2513 | if (SCM_CHEAPTRAPS_P)\ |
6dbd0af5 | 2514 | {\ |
c0ab1b8d | 2515 | tmp = scm_make_debugobj (&debug);\ |
d95c0b76 | 2516 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
b6d75948 | 2517 | }\ |
6dbd0af5 MD |
2518 | else\ |
2519 | {\ | |
5f144b10 GH |
2520 | int first;\ |
2521 | tmp = scm_make_continuation (&first);\ | |
2522 | if (first)\ | |
d95c0b76 | 2523 | scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\ |
6dbd0af5 | 2524 | }\ |
d95c0b76 | 2525 | SCM_TRAPS_P = 1;\ |
6dbd0af5 | 2526 | }\ |
d3a6bc94 | 2527 | } while (0) |
0f2d19dd | 2528 | #undef RETURN |
ddea3325 | 2529 | #define RETURN(e) do { proc = (e); goto exit; } while (0) |
b7ff98dd MD |
2530 | #ifdef STACK_CHECKING |
2531 | #ifndef EVAL_STACK_CHECKING | |
2532 | #define EVAL_STACK_CHECKING | |
2533 | #endif | |
6dbd0af5 MD |
2534 | #endif |
2535 | ||
2536 | /* scm_ceval_ptr points to the currently selected evaluator. | |
2537 | * *fixme*: Although efficiency is important here, this state variable | |
2538 | * should probably not be a global. It should be related to the | |
2539 | * current repl. | |
2540 | */ | |
2541 | ||
1cc91f1b | 2542 | |
1bbd0b84 | 2543 | SCM (*scm_ceval_ptr) (SCM x, SCM env); |
0f2d19dd | 2544 | |
1646d37b | 2545 | /* scm_last_debug_frame contains a pointer to the last debugging |
6dbd0af5 MD |
2546 | * information stack frame. It is accessed very often from the |
2547 | * debugging evaluator, so it should probably not be indirectly | |
2548 | * addressed. Better to save and restore it from the current root at | |
2549 | * any stack swaps. | |
2550 | */ | |
2551 | ||
6dbd0af5 MD |
2552 | /* scm_debug_eframe_size is the number of slots available for pseudo |
2553 | * stack frames at each real stack frame. | |
2554 | */ | |
2555 | ||
c014a02e | 2556 | long scm_debug_eframe_size; |
6dbd0af5 | 2557 | |
b7ff98dd | 2558 | int scm_debug_mode, scm_check_entry_p, scm_check_apply_p, scm_check_exit_p; |
6dbd0af5 | 2559 | |
c014a02e | 2560 | long scm_eval_stack; |
a74145b8 | 2561 | |
92c2555f | 2562 | scm_t_option scm_eval_opts[] = { |
a74145b8 | 2563 | { SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." } |
33b97402 MD |
2564 | }; |
2565 | ||
92c2555f | 2566 | scm_t_option scm_debug_opts[] = { |
b7ff98dd MD |
2567 | { SCM_OPTION_BOOLEAN, "cheap", 1, |
2568 | "*Flyweight representation of the stack at traps." }, | |
2569 | { SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." }, | |
2570 | { SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." }, | |
2571 | { SCM_OPTION_BOOLEAN, "procnames", 1, | |
2572 | "Record procedure names at definition." }, | |
2573 | { SCM_OPTION_BOOLEAN, "backwards", 0, | |
2574 | "Display backtrace in anti-chronological order." }, | |
274dc5fd | 2575 | { SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." }, |
4e646a03 MD |
2576 | { SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." }, |
2577 | { SCM_OPTION_INTEGER, "frames", 3, | |
b7ff98dd | 2578 | "Maximum number of tail-recursive frames in backtrace." }, |
4e646a03 MD |
2579 | { SCM_OPTION_INTEGER, "maxdepth", 1000, |
2580 | "Maximal number of stored backtrace frames." }, | |
2581 | { SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." }, | |
11f77bfc MD |
2582 | { SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." }, |
2583 | { SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." }, | |
863e833b | 2584 | { SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }, |
d95c0b76 | 2585 | { 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 |
2586 | }; |
2587 | ||
92c2555f | 2588 | scm_t_option scm_evaluator_trap_table[] = { |
b6d75948 | 2589 | { SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." }, |
b7ff98dd MD |
2590 | { SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." }, |
2591 | { SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." }, | |
d95c0b76 NJ |
2592 | { SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }, |
2593 | { SCM_OPTION_SCM, "enter-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for enter-frame traps." }, | |
2594 | { SCM_OPTION_SCM, "apply-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for apply-frame traps." }, | |
2595 | { SCM_OPTION_SCM, "exit-frame-handler", (unsigned long)SCM_BOOL_F, "Handler for exit-frame traps." } | |
6dbd0af5 MD |
2596 | }; |
2597 | ||
a1ec6916 | 2598 | SCM_DEFINE (scm_eval_options_interface, "eval-options-interface", 0, 1, 0, |
1bbd0b84 | 2599 | (SCM setting), |
b3f26b14 MG |
2600 | "Option interface for the evaluation options. Instead of using\n" |
2601 | "this procedure directly, use the procedures @code{eval-enable},\n" | |
3939e9df | 2602 | "@code{eval-disable}, @code{eval-set!} and @code{eval-options}.") |
1bbd0b84 | 2603 | #define FUNC_NAME s_scm_eval_options_interface |
33b97402 MD |
2604 | { |
2605 | SCM ans; | |
2606 | SCM_DEFER_INTS; | |
2607 | ans = scm_options (setting, | |
2608 | scm_eval_opts, | |
2609 | SCM_N_EVAL_OPTIONS, | |
1bbd0b84 | 2610 | FUNC_NAME); |
a74145b8 | 2611 | scm_eval_stack = SCM_EVAL_STACK * sizeof (void *); |
33b97402 MD |
2612 | SCM_ALLOW_INTS; |
2613 | return ans; | |
2614 | } | |
1bbd0b84 | 2615 | #undef FUNC_NAME |
33b97402 | 2616 | |
d0b07b5d | 2617 | |
a1ec6916 | 2618 | SCM_DEFINE (scm_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, |
1bbd0b84 | 2619 | (SCM setting), |
b3f26b14 | 2620 | "Option interface for the evaluator trap options.") |
1bbd0b84 | 2621 | #define FUNC_NAME s_scm_evaluator_traps |
33b97402 MD |
2622 | { |
2623 | SCM ans; | |
2624 | SCM_DEFER_INTS; | |
2625 | ans = scm_options (setting, | |
2626 | scm_evaluator_trap_table, | |
2627 | SCM_N_EVALUATOR_TRAPS, | |
1bbd0b84 | 2628 | FUNC_NAME); |
33b97402 | 2629 | SCM_RESET_DEBUG_MODE; |
bfc69694 | 2630 | SCM_ALLOW_INTS; |
33b97402 MD |
2631 | return ans; |
2632 | } | |
1bbd0b84 | 2633 | #undef FUNC_NAME |
33b97402 | 2634 | |
d0b07b5d | 2635 | |
24933780 | 2636 | static SCM |
a392ee15 | 2637 | deval_args (SCM l, SCM env, SCM proc, SCM *lloc) |
0f2d19dd | 2638 | { |
680ed4a8 | 2639 | SCM *results = lloc, res; |
904a077d | 2640 | while (SCM_CONSP (l)) |
0f2d19dd | 2641 | { |
680ed4a8 | 2642 | res = EVALCAR (l, env); |
904a077d | 2643 | |
8ea46249 | 2644 | *lloc = scm_list_1 (res); |
a23afe53 | 2645 | lloc = SCM_CDRLOC (*lloc); |
0f2d19dd JB |
2646 | l = SCM_CDR (l); |
2647 | } | |
22a52da1 | 2648 | if (!SCM_NULLP (l)) |
904a077d | 2649 | scm_wrong_num_args (proc); |
680ed4a8 | 2650 | return *results; |
0f2d19dd JB |
2651 | } |
2652 | ||
6dbd0af5 MD |
2653 | #endif /* !DEVAL */ |
2654 | ||
2655 | ||
a392ee15 | 2656 | /* SECTION: This code is compiled twice. |
6dbd0af5 MD |
2657 | */ |
2658 | ||
a392ee15 | 2659 | |
d9d39d76 | 2660 | /* Update the toplevel environment frame ENV so that it refers to the |
a392ee15 | 2661 | * current module. */ |
d9d39d76 MV |
2662 | #define UPDATE_TOPLEVEL_ENV(env) \ |
2663 | do { \ | |
2664 | SCM p = scm_current_module_lookup_closure (); \ | |
d0b07b5d | 2665 | if (p != SCM_CAR (env)) \ |
d9d39d76 MV |
2666 | env = scm_top_level_env (p); \ |
2667 | } while (0) | |
2668 | ||
6dbd0af5 | 2669 | |
a392ee15 DH |
2670 | /* This is the evaluator. Like any real monster, it has three heads: |
2671 | * | |
2672 | * scm_ceval is the non-debugging evaluator, scm_deval is the debugging | |
2673 | * version. Both are implemented using a common code base, using the | |
2674 | * following mechanism: SCM_CEVAL is a macro, which is either defined to | |
2675 | * scm_ceval or scm_deval. Thus, there is no function SCM_CEVAL, but the code | |
2676 | * for SCM_CEVAL actually compiles to either scm_ceval or scm_deval. When | |
2677 | * SCM_CEVAL is defined to scm_ceval, it is known that the macro DEVAL is not | |
2678 | * defined. When SCM_CEVAL is defined to scm_deval, then the macro DEVAL is | |
2679 | * known to be defined. Thus, in SCM_CEVAL parts for the debugging evaluator | |
2680 | * are enclosed within #ifdef DEVAL ... #endif. | |
2681 | * | |
2682 | * All three (scm_ceval, scm_deval and their common implementation SCM_CEVAL) | |
2683 | * take two input parameters, x and env: x is a single expression to be | |
2684 | * evalutated. env is the environment in which bindings are searched. | |
2685 | * | |
2686 | * x is known to be a cell (i. e. a pair or any other non-immediate). Since x | |
2687 | * is a single expression, it is necessarily in a tail position. If x is just | |
2688 | * a call to another function like in the expression (foo exp1 exp2 ...), the | |
2689 | * realization of that call therefore _must_not_ increase stack usage (the | |
2690 | * evaluation of exp1, exp2 etc., however, may do so). This is realized by | |
2691 | * making extensive use of 'goto' statements within the evaluator: The gotos | |
2692 | * replace recursive calls to SCM_CEVAL, thus re-using the same stack frame | |
2693 | * that SCM_CEVAL was already using. If, however, x represents some form that | |
2694 | * requires to evaluate a sequence of expressions like (begin exp1 exp2 ...), | |
2695 | * then recursive calls to SCM_CEVAL are performed for all but the last | |
2696 | * expression of that sequence. */ | |
6dbd0af5 | 2697 | |
0f2d19dd | 2698 | #if 0 |
0f2d19dd | 2699 | SCM |
1bbd0b84 | 2700 | scm_ceval (SCM x, SCM env) |
0f2d19dd JB |
2701 | {} |
2702 | #endif | |
1cc91f1b | 2703 | |
a392ee15 | 2704 | #if 0 |
0f2d19dd | 2705 | SCM |
1bbd0b84 | 2706 | scm_deval (SCM x, SCM env) |
0f2d19dd JB |
2707 | {} |
2708 | #endif | |
2709 | ||
6dbd0af5 | 2710 | SCM |
1bbd0b84 | 2711 | SCM_CEVAL (SCM x, SCM env) |
0f2d19dd | 2712 | { |
42030fb2 | 2713 | SCM proc, arg1; |
6dbd0af5 | 2714 | #ifdef DEVAL |
92c2555f MV |
2715 | scm_t_debug_frame debug; |
2716 | scm_t_debug_info *debug_info_end; | |
1646d37b | 2717 | debug.prev = scm_last_debug_frame; |
020c890c | 2718 | debug.status = 0; |
04b6c081 | 2719 | /* |
92c2555f | 2720 | * The debug.vect contains twice as much scm_t_debug_info frames as the |
04b6c081 MD |
2721 | * user has specified with (debug-set! frames <n>). |
2722 | * | |
2723 | * Even frames are eval frames, odd frames are apply frames. | |
2724 | */ | |
92c2555f | 2725 | debug.vect = (scm_t_debug_info *) alloca (scm_debug_eframe_size |
a392ee15 | 2726 | * sizeof (scm_t_debug_info)); |
c0ab1b8d JB |
2727 | debug.info = debug.vect; |
2728 | debug_info_end = debug.vect + scm_debug_eframe_size; | |
2729 | scm_last_debug_frame = &debug; | |
6dbd0af5 | 2730 | #endif |
b7ff98dd | 2731 | #ifdef EVAL_STACK_CHECKING |
79f55b7c | 2732 | if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc)) |
6dbd0af5 | 2733 | { |
b7ff98dd | 2734 | #ifdef DEVAL |
6dbd0af5 MD |
2735 | debug.info->e.exp = x; |
2736 | debug.info->e.env = env; | |
b7ff98dd | 2737 | #endif |
6dbd0af5 MD |
2738 | scm_report_stack_overflow (); |
2739 | } | |
2740 | #endif | |
6a0f6ff3 | 2741 | |
6dbd0af5 MD |
2742 | #ifdef DEVAL |
2743 | goto start; | |
2744 | #endif | |
6a0f6ff3 | 2745 | |
6dbd0af5 MD |
2746 | loop: |
2747 | #ifdef DEVAL | |
b7ff98dd MD |
2748 | SCM_CLEAR_ARGSREADY (debug); |
2749 | if (SCM_OVERFLOWP (debug)) | |
6dbd0af5 | 2750 | --debug.info; |
04b6c081 MD |
2751 | /* |
2752 | * In theory, this should be the only place where it is necessary to | |
2753 | * check for space in debug.vect since both eval frames and | |
2754 | * available space are even. | |
2755 | * | |
2756 | * For this to be the case, however, it is necessary that primitive | |
2757 | * special forms which jump back to `loop', `begin' or some similar | |
680516ba | 2758 | * label call PREP_APPLY. |
04b6c081 | 2759 | */ |
c0ab1b8d | 2760 | else if (++debug.info >= debug_info_end) |
6dbd0af5 | 2761 | { |
b7ff98dd | 2762 | SCM_SET_OVERFLOW (debug); |
6dbd0af5 MD |
2763 | debug.info -= 2; |
2764 | } | |
6a0f6ff3 | 2765 | |
6dbd0af5 MD |
2766 | start: |
2767 | debug.info->e.exp = x; | |
2768 | debug.info->e.env = env; | |
5132eef0 DH |
2769 | if (scm_check_entry_p && SCM_TRAPS_P) |
2770 | { | |
bc76d628 DH |
2771 | if (SCM_ENTER_FRAME_P |
2772 | || (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x))) | |
5132eef0 | 2773 | { |
bc76d628 DH |
2774 | SCM stackrep; |
2775 | SCM tail = SCM_BOOL (SCM_TAILRECP (debug)); | |
5132eef0 DH |
2776 | SCM_SET_TAILREC (debug); |
2777 | if (SCM_CHEAPTRAPS_P) | |
bc76d628 | 2778 | stackrep = scm_make_debugobj (&debug); |
5132eef0 DH |
2779 | else |
2780 | { | |
2781 | int first; | |
2782 | SCM val = scm_make_continuation (&first); | |
2783 | ||
2784 | if (first) | |
bc76d628 | 2785 | stackrep = val; |
5132eef0 DH |
2786 | else |
2787 | { | |
2788 | x = val; | |
2789 | if (SCM_IMP (x)) | |
2790 | RETURN (x); | |
2791 | else | |
2792 | /* This gives the possibility for the debugger to | |
2793 | modify the source expression before evaluation. */ | |
2794 | goto dispatch; | |
2795 | } | |
2796 | } | |
2797 | SCM_TRAPS_P = 0; | |
2798 | scm_call_4 (SCM_ENTER_FRAME_HDLR, | |
2799 | scm_sym_enter_frame, | |
bc76d628 | 2800 | stackrep, |
5132eef0 DH |
2801 | tail, |
2802 | scm_unmemocopy (x, env)); | |
2803 | SCM_TRAPS_P = 1; | |
2804 | } | |
2805 | } | |
6dbd0af5 | 2806 | #endif |
f8769b1d | 2807 | dispatch: |
9cb5124f | 2808 | SCM_TICK; |
0f2d19dd JB |
2809 | switch (SCM_TYP7 (x)) |
2810 | { | |
1b43d24c | 2811 | case SCM_BIT7 (SCM_IM_AND): |
0f2d19dd | 2812 | x = SCM_CDR (x); |
302c12b4 DH |
2813 | while (!SCM_NULLP (SCM_CDR (x))) |
2814 | { | |
38ace99e DH |
2815 | SCM test_result = EVALCAR (x, env); |
2816 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
0f2d19dd | 2817 | RETURN (SCM_BOOL_F); |
302c12b4 DH |
2818 | else |
2819 | x = SCM_CDR (x); | |
2820 | } | |
6dbd0af5 | 2821 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2822 | goto carloop; |
2823 | ||
1b43d24c | 2824 | case SCM_BIT7 (SCM_IM_BEGIN): |
e050d4f8 DH |
2825 | x = SCM_CDR (x); |
2826 | if (SCM_NULLP (x)) | |
b8113bc8 MV |
2827 | RETURN (SCM_UNSPECIFIED); |
2828 | ||
6dbd0af5 | 2829 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
2830 | |
2831 | begin: | |
4163eb72 MV |
2832 | /* If we are on toplevel with a lookup closure, we need to sync |
2833 | with the current module. */ | |
22a52da1 | 2834 | if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env))) |
4163eb72 | 2835 | { |
d9d39d76 | 2836 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2837 | while (!SCM_NULLP (SCM_CDR (x))) |
4163eb72 | 2838 | { |
5280aaca | 2839 | EVALCAR (x, env); |
d9d39d76 | 2840 | UPDATE_TOPLEVEL_ENV (env); |
302c12b4 | 2841 | x = SCM_CDR (x); |
4163eb72 | 2842 | } |
5280aaca | 2843 | goto carloop; |
4163eb72 MV |
2844 | } |
2845 | else | |
5280aaca MV |
2846 | goto nontoplevel_begin; |
2847 | ||
5280aaca | 2848 | nontoplevel_begin: |
302c12b4 | 2849 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 2850 | { |
6a0f6ff3 DH |
2851 | SCM form = SCM_CAR (x); |
2852 | if (SCM_IMP (form)) | |
26d5b9b4 | 2853 | { |
6a0f6ff3 | 2854 | if (SCM_ISYMP (form)) |
26d5b9b4 | 2855 | { |
28d52ebb | 2856 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
2857 | /* check for race condition */ |
2858 | if (SCM_ISYMP (SCM_CAR (x))) | |
328dc9a3 | 2859 | x = m_expand_body (x, env); |
28d52ebb | 2860 | scm_rec_mutex_unlock (&source_mutex); |
5280aaca | 2861 | goto nontoplevel_begin; |
26d5b9b4 | 2862 | } |
4163eb72 | 2863 | else |
6a0f6ff3 | 2864 | SCM_VALIDATE_NON_EMPTY_COMBINATION (form); |
26d5b9b4 | 2865 | } |
5280aaca | 2866 | else |
6a0f6ff3 | 2867 | SCM_CEVAL (form, env); |
302c12b4 | 2868 | x = SCM_CDR (x); |
0f2d19dd | 2869 | } |
5280aaca | 2870 | |
6a0f6ff3 DH |
2871 | carloop: |
2872 | { | |
2873 | /* scm_eval last form in list */ | |
2874 | SCM last_form = SCM_CAR (x); | |
0f2d19dd | 2875 | |
6a0f6ff3 DH |
2876 | if (SCM_CONSP (last_form)) |
2877 | { | |
2878 | /* This is by far the most frequent case. */ | |
2879 | x = last_form; | |
2880 | goto loop; /* tail recurse */ | |
2881 | } | |
2882 | else if (SCM_IMP (last_form)) | |
2883 | RETURN (SCM_EVALIM (last_form, env)); | |
2884 | else if (SCM_VARIABLEP (last_form)) | |
2885 | RETURN (SCM_VARIABLE_REF (last_form)); | |
2886 | else if (SCM_SYMBOLP (last_form)) | |
2887 | RETURN (*scm_lookupcar (x, env, 1)); | |
2888 | else | |
2889 | RETURN (last_form); | |
2890 | } | |
0f2d19dd JB |
2891 | |
2892 | ||
1b43d24c | 2893 | case SCM_BIT7 (SCM_IM_CASE): |
0f2d19dd | 2894 | x = SCM_CDR (x); |
6a0f6ff3 DH |
2895 | { |
2896 | SCM key = EVALCAR (x, env); | |
2897 | x = SCM_CDR (x); | |
2898 | while (!SCM_NULLP (x)) | |
2899 | { | |
2900 | SCM clause = SCM_CAR (x); | |
2901 | SCM labels = SCM_CAR (clause); | |
2a6f7afe | 2902 | if (SCM_EQ_P (labels, SCM_IM_ELSE)) |
6a0f6ff3 DH |
2903 | { |
2904 | x = SCM_CDR (clause); | |
2905 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2906 | goto begin; | |
2907 | } | |
2908 | while (!SCM_NULLP (labels)) | |
2909 | { | |
2910 | SCM label = SCM_CAR (labels); | |
2911 | if (SCM_EQ_P (label, key) || !SCM_FALSEP (scm_eqv_p (label, key))) | |
2912 | { | |
2913 | x = SCM_CDR (clause); | |
2914 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2915 | goto begin; | |
2916 | } | |
2917 | labels = SCM_CDR (labels); | |
2918 | } | |
2919 | x = SCM_CDR (x); | |
2920 | } | |
2921 | } | |
ddea3325 | 2922 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
2923 | |
2924 | ||
1b43d24c | 2925 | case SCM_BIT7 (SCM_IM_COND): |
8ea46249 DH |
2926 | x = SCM_CDR (x); |
2927 | while (!SCM_NULLP (x)) | |
0f2d19dd | 2928 | { |
e5cb71a0 | 2929 | SCM clause = SCM_CAR (x); |
609a8b86 | 2930 | if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE)) |
8ea46249 | 2931 | { |
e5cb71a0 | 2932 | x = SCM_CDR (clause); |
8ea46249 DH |
2933 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
2934 | goto begin; | |
2935 | } | |
e5cb71a0 | 2936 | else |
0f2d19dd | 2937 | { |
dff98306 DH |
2938 | arg1 = EVALCAR (clause, env); |
2939 | if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1)) | |
6dbd0af5 | 2940 | { |
e5cb71a0 DH |
2941 | x = SCM_CDR (clause); |
2942 | if (SCM_NULLP (x)) | |
dff98306 | 2943 | RETURN (arg1); |
609a8b86 | 2944 | else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW)) |
e5cb71a0 DH |
2945 | { |
2946 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
2947 | goto begin; | |
2948 | } | |
2949 | else | |
2950 | { | |
2951 | proc = SCM_CDR (x); | |
2952 | proc = EVALCAR (proc, env); | |
dff98306 | 2953 | PREP_APPLY (proc, scm_list_1 (arg1)); |
e5cb71a0 | 2954 | ENTER_APPLY; |
ddd8f927 | 2955 | goto evap1; |
e5cb71a0 | 2956 | } |
6dbd0af5 | 2957 | } |
e5cb71a0 | 2958 | x = SCM_CDR (x); |
0f2d19dd JB |
2959 | } |
2960 | } | |
ddea3325 | 2961 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
2962 | |
2963 | ||
1b43d24c | 2964 | case SCM_BIT7 (SCM_IM_DO): |
0f2d19dd | 2965 | x = SCM_CDR (x); |
e5cb71a0 DH |
2966 | { |
2967 | /* Compute the initialization values and the initial environment. */ | |
e681d187 | 2968 | SCM init_forms = SCM_CAR (x); |
e5cb71a0 DH |
2969 | SCM init_values = SCM_EOL; |
2970 | while (!SCM_NULLP (init_forms)) | |
2971 | { | |
2972 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
2973 | init_forms = SCM_CDR (init_forms); | |
2974 | } | |
e681d187 | 2975 | x = SCM_CDR (x); |
821f18a4 | 2976 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
e5cb71a0 | 2977 | } |
e681d187 | 2978 | x = SCM_CDR (x); |
e5cb71a0 DH |
2979 | { |
2980 | SCM test_form = SCM_CAR (x); | |
2981 | SCM body_forms = SCM_CADR (x); | |
2982 | SCM step_forms = SCM_CDDR (x); | |
2983 | ||
2984 | SCM test_result = EVALCAR (test_form, env); | |
2985 | ||
2986 | while (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
2987 | { | |
0f2d19dd | 2988 | { |
e5cb71a0 DH |
2989 | /* Evaluate body forms. */ |
2990 | SCM temp_forms; | |
2991 | for (temp_forms = body_forms; | |
2992 | !SCM_NULLP (temp_forms); | |
2993 | temp_forms = SCM_CDR (temp_forms)) | |
2994 | { | |
2995 | SCM form = SCM_CAR (temp_forms); | |
2996 | /* Dirk:FIXME: We only need to eval forms, that may have a | |
2997 | * side effect here. This is only true for forms that start | |
2998 | * with a pair. All others are just constants. However, | |
2999 | * since in the common case there is no constant expression | |
3000 | * in a body of a do form, we just check for immediates here | |
3001 | * and have SCM_CEVAL take care of other cases. In the long | |
3002 | * run it would make sense to get rid of this test and have | |
3003 | * the macro transformer of 'do' eliminate all forms that | |
3004 | * have no sideeffect. */ | |
3005 | if (!SCM_IMP (form)) | |
3006 | SCM_CEVAL (form, env); | |
3007 | } | |
0f2d19dd | 3008 | } |
e5cb71a0 DH |
3009 | |
3010 | { | |
3011 | /* Evaluate the step expressions. */ | |
3012 | SCM temp_forms; | |
3013 | SCM step_values = SCM_EOL; | |
3014 | for (temp_forms = step_forms; | |
3015 | !SCM_NULLP (temp_forms); | |
3016 | temp_forms = SCM_CDR (temp_forms)) | |
3017 | { | |
3018 | SCM value = EVALCAR (temp_forms, env); | |
3019 | step_values = scm_cons (value, step_values); | |
3020 | } | |
821f18a4 DH |
3021 | env = SCM_EXTEND_ENV (SCM_CAAR (env), |
3022 | step_values, | |
3023 | SCM_CDR (env)); | |
e5cb71a0 DH |
3024 | } |
3025 | ||
3026 | test_result = EVALCAR (test_form, env); | |
3027 | } | |
3028 | } | |
3029 | x = SCM_CDAR (x); | |
0f2d19dd | 3030 | if (SCM_NULLP (x)) |
6dbd0af5 MD |
3031 | RETURN (SCM_UNSPECIFIED); |
3032 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
5280aaca | 3033 | goto nontoplevel_begin; |
0f2d19dd JB |
3034 | |
3035 | ||
1b43d24c | 3036 | case SCM_BIT7 (SCM_IM_IF): |
0f2d19dd | 3037 | x = SCM_CDR (x); |
38ace99e DH |
3038 | { |
3039 | SCM test_result = EVALCAR (x, env); | |
4610b011 DH |
3040 | x = SCM_CDR (x); /* then expression */ |
3041 | if (SCM_FALSEP (test_result) || SCM_NILP (test_result)) | |
38ace99e | 3042 | { |
4610b011 | 3043 | x = SCM_CDR (x); /* else expression */ |
38ace99e DH |
3044 | if (SCM_NULLP (x)) |
3045 | RETURN (SCM_UNSPECIFIED); | |
3046 | } | |
3047 | } | |
6dbd0af5 | 3048 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3049 | goto carloop; |
3050 | ||
3051 | ||
1b43d24c | 3052 | case SCM_BIT7 (SCM_IM_LET): |
0f2d19dd | 3053 | x = SCM_CDR (x); |
38ace99e DH |
3054 | { |
3055 | SCM init_forms = SCM_CADR (x); | |
3056 | SCM init_values = SCM_EOL; | |
3057 | do | |
3058 | { | |
3059 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3060 | init_forms = SCM_CDR (init_forms); | |
3061 | } | |
3062 | while (!SCM_NULLP (init_forms)); | |
821f18a4 | 3063 | env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env); |
38ace99e | 3064 | } |
e050d4f8 DH |
3065 | x = SCM_CDDR (x); |
3066 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3067 | goto nontoplevel_begin; | |
0f2d19dd JB |
3068 | |
3069 | ||
1b43d24c | 3070 | case SCM_BIT7 (SCM_IM_LETREC): |
0f2d19dd | 3071 | x = SCM_CDR (x); |
821f18a4 | 3072 | env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env); |
0f2d19dd | 3073 | x = SCM_CDR (x); |
38ace99e DH |
3074 | { |
3075 | SCM init_forms = SCM_CAR (x); | |
3076 | SCM init_values = SCM_EOL; | |
3077 | do | |
3078 | { | |
3079 | init_values = scm_cons (EVALCAR (init_forms, env), init_values); | |
3080 | init_forms = SCM_CDR (init_forms); | |
3081 | } | |
3082 | while (!SCM_NULLP (init_forms)); | |
3083 | SCM_SETCDR (SCM_CAR (env), init_values); | |
3084 | } | |
e050d4f8 DH |
3085 | x = SCM_CDR (x); |
3086 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3087 | goto nontoplevel_begin; | |
0f2d19dd JB |
3088 | |
3089 | ||
1b43d24c | 3090 | case SCM_BIT7 (SCM_IM_LETSTAR): |
0f2d19dd | 3091 | x = SCM_CDR (x); |
302c12b4 DH |
3092 | { |
3093 | SCM bindings = SCM_CAR (x); | |
3094 | if (SCM_NULLP (bindings)) | |
821f18a4 | 3095 | env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env); |
302c12b4 DH |
3096 | else |
3097 | { | |
3098 | do | |
3099 | { | |
3100 | SCM name = SCM_CAR (bindings); | |
3101 | SCM init = SCM_CDR (bindings); | |
821f18a4 | 3102 | env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env); |
302c12b4 DH |
3103 | bindings = SCM_CDR (init); |
3104 | } | |
3105 | while (!SCM_NULLP (bindings)); | |
3106 | } | |
3107 | } | |
e050d4f8 DH |
3108 | x = SCM_CDR (x); |
3109 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3110 | goto nontoplevel_begin; | |
0f2d19dd | 3111 | |
302c12b4 | 3112 | |
1b43d24c | 3113 | case SCM_BIT7 (SCM_IM_OR): |
0f2d19dd | 3114 | x = SCM_CDR (x); |
302c12b4 | 3115 | while (!SCM_NULLP (SCM_CDR (x))) |
0f2d19dd | 3116 | { |
302c12b4 | 3117 | SCM val = EVALCAR (x, env); |
c96d76b8 | 3118 | if (!SCM_FALSEP (val) && !SCM_NILP (val)) |
302c12b4 DH |
3119 | RETURN (val); |
3120 | else | |
3121 | x = SCM_CDR (x); | |
0f2d19dd | 3122 | } |
6dbd0af5 | 3123 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
0f2d19dd JB |
3124 | goto carloop; |
3125 | ||
3126 | ||
1b43d24c | 3127 | case SCM_BIT7 (SCM_IM_LAMBDA): |
0f2d19dd JB |
3128 | RETURN (scm_closure (SCM_CDR (x), env)); |
3129 | ||
3130 | ||
1b43d24c | 3131 | case SCM_BIT7 (SCM_IM_QUOTE): |
8ea46249 | 3132 | RETURN (SCM_CADR (x)); |
0f2d19dd JB |
3133 | |
3134 | ||
1b43d24c | 3135 | case SCM_BIT7 (SCM_IM_SET_X): |
0f2d19dd | 3136 | x = SCM_CDR (x); |
38ace99e DH |
3137 | { |
3138 | SCM *location; | |
3139 | SCM variable = SCM_CAR (x); | |
e050d4f8 | 3140 | if (SCM_ILOCP (variable)) |
38ace99e | 3141 | location = scm_ilookup (variable, env); |
3063e30a | 3142 | else if (SCM_VARIABLEP (variable)) |
e050d4f8 | 3143 | location = SCM_VARIABLE_LOC (variable); |
38ace99e DH |
3144 | else /* (SCM_SYMBOLP (variable)) is known to be true */ |
3145 | location = scm_lookupcar (x, env, 1); | |
3146 | x = SCM_CDR (x); | |
3147 | *location = EVALCAR (x, env); | |
3148 | } | |
0f2d19dd | 3149 | RETURN (SCM_UNSPECIFIED); |
0f2d19dd JB |
3150 | |
3151 | ||
0f2d19dd | 3152 | /* new syntactic forms go here. */ |
1b43d24c | 3153 | case SCM_BIT7 (SCM_MAKISYM (0)): |
0f2d19dd | 3154 | proc = SCM_CAR (x); |
a392ee15 | 3155 | switch (SCM_ISYMNUM (proc)) |
0f2d19dd | 3156 | { |
3f04400d DH |
3157 | |
3158 | ||
22f2cf2d DH |
3159 | case (SCM_ISYMNUM (SCM_IM_DEFINE)): |
3160 | /* Top level defines are handled directly by the memoizer and thus | |
3161 | * will never generate memoized code with SCM_IM_DEFINE. Internal | |
3162 | * defines which occur at valid positions will be transformed into | |
3163 | * letrec expressions. Thus, whenever the executor detects | |
3164 | * SCM_IM_DEFINE, this must come from an internal definition at an | |
3165 | * illegal position. */ | |
3166 | scm_misc_error (NULL, "Bad define placement", SCM_EOL); | |
3167 | ||
3168 | ||
0f2d19dd | 3169 | case (SCM_ISYMNUM (SCM_IM_APPLY)): |
e910e9d2 DH |
3170 | x = SCM_CDR (x); |
3171 | proc = EVALCAR (x, env); | |
3172 | PREP_APPLY (proc, SCM_EOL); | |
3173 | x = SCM_CDR (x); | |
3174 | arg1 = EVALCAR (x, env); | |
9a069bdd DH |
3175 | |
3176 | apply_proc: | |
3177 | /* Go here to tail-apply a procedure. PROC is the procedure and | |
3178 | * ARG1 is the list of arguments. PREP_APPLY must have been called | |
3179 | * before jumping to apply_proc. */ | |
0f2d19dd JB |
3180 | if (SCM_CLOSUREP (proc)) |
3181 | { | |
9a069bdd | 3182 | SCM formals = SCM_CLOSURE_FORMALS (proc); |
6dbd0af5 | 3183 | #ifdef DEVAL |
9a069bdd | 3184 | debug.info->a.args = arg1; |
6dbd0af5 | 3185 | #endif |
9a069bdd DH |
3186 | if (scm_badargsp (formals, arg1)) |
3187 | scm_wrong_num_args (proc); | |
3188 | ENTER_APPLY; | |
3189 | /* Copy argument list */ | |
3190 | if (SCM_NULL_OR_NIL_P (arg1)) | |
3191 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3192 | else | |
3193 | { | |
3194 | SCM args = scm_list_1 (SCM_CAR (arg1)); | |
3195 | SCM tail = args; | |
3196 | arg1 = SCM_CDR (arg1); | |
3197 | while (!SCM_NULL_OR_NIL_P (arg1)) | |
3198 | { | |
3199 | SCM new_tail = scm_list_1 (SCM_CAR (arg1)); | |
3200 | SCM_SETCDR (tail, new_tail); | |
3201 | tail = new_tail; | |
3202 | arg1 = SCM_CDR (arg1); | |
3203 | } | |
3204 | env = SCM_EXTEND_ENV (formals, args, SCM_ENV (proc)); | |
3205 | } | |
3206 | ||
3207 | x = SCM_CLOSURE_BODY (proc); | |
3208 | goto nontoplevel_begin; | |
0f2d19dd | 3209 | } |
3f04400d DH |
3210 | else |
3211 | { | |
e910e9d2 DH |
3212 | ENTER_APPLY; |
3213 | RETURN (SCM_APPLY (proc, arg1, SCM_EOL)); | |
3f04400d DH |
3214 | } |
3215 | ||
0f2d19dd JB |
3216 | |
3217 | case (SCM_ISYMNUM (SCM_IM_CONT)): | |
5f144b10 GH |
3218 | { |
3219 | int first; | |
3220 | SCM val = scm_make_continuation (&first); | |
3221 | ||
e050d4f8 | 3222 | if (!first) |
5f144b10 | 3223 | RETURN (val); |
e050d4f8 DH |
3224 | else |
3225 | { | |
3226 | arg1 = val; | |
3227 | proc = SCM_CDR (x); | |
3228 | proc = scm_eval_car (proc, env); | |
e050d4f8 DH |
3229 | PREP_APPLY (proc, scm_list_1 (arg1)); |
3230 | ENTER_APPLY; | |
e050d4f8 DH |
3231 | goto evap1; |
3232 | } | |
5f144b10 | 3233 | } |
e050d4f8 | 3234 | |
0f2d19dd | 3235 | |
a570e93a | 3236 | case (SCM_ISYMNUM (SCM_IM_DELAY)): |
ddea3325 | 3237 | RETURN (scm_makprom (scm_closure (SCM_CDR (x), env))); |
a570e93a | 3238 | |
e050d4f8 | 3239 | |
28d52ebb MD |
3240 | case (SCM_ISYMNUM (SCM_IM_FUTURE)): |
3241 | RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env))); | |
3242 | ||
3243 | ||
c8e1d354 MD |
3244 | /* PLACEHOLDER for case (SCM_ISYMNUM (SCM_IM_DISPATCH)): The |
3245 | following code (type_dispatch) is intended to be the tail | |
3246 | of the case clause for the internal macro | |
3247 | SCM_IM_DISPATCH. Please don't remove it from this | |
3248 | location without discussing it with Mikael | |
3249 | <djurfeldt@nada.kth.se> */ | |
3250 | ||
f12745b6 DH |
3251 | /* The type dispatch code is duplicated below |
3252 | * (c.f. objects.c:scm_mcache_compute_cmethod) since that | |
3253 | * cuts down execution time for type dispatch to 50%. */ | |
dff98306 | 3254 | type_dispatch: /* inputs: x, arg1 */ |
f12745b6 DH |
3255 | /* Type dispatch means to determine from the types of the function |
3256 | * arguments (i. e. the 'signature' of the call), which method from | |
3257 | * a generic function is to be called. This process of selecting | |
3258 | * the right method takes some time. To speed it up, guile uses | |
3259 | * caching: Together with the macro call to dispatch the signatures | |
3260 | * of some previous calls to that generic function from the same | |
3261 | * place are stored (in the code!) in a cache that we call the | |
3262 | * 'method cache'. This is done since it is likely, that | |
3263 | * consecutive calls to dispatch from that position in the code will | |
3264 | * have the same signature. Thus, the type dispatch works as | |
3265 | * follows: First, determine a hash value from the signature of the | |
3266 | * actual arguments. Second, use this hash value as an index to | |
3267 | * find that same signature in the method cache stored at this | |
3268 | * position in the code. If found, you have also found the | |
3269 | * corresponding method that belongs to that signature. If the | |
3270 | * signature is not found in the method cache, you have to perform a | |
3271 | * full search over all signatures stored with the generic | |
3272 | * function. */ | |
3273 | { | |
3274 | unsigned long int specializers; | |
3275 | unsigned long int hash_value; | |
3276 | unsigned long int cache_end_pos; | |
3277 | unsigned long int mask; | |
3278 | SCM method_cache; | |
3279 | ||
3280 | { | |
3281 | SCM z = SCM_CDDR (x); | |
3282 | SCM tmp = SCM_CADR (z); | |
3283 | specializers = SCM_INUM (SCM_CAR (z)); | |
3284 | ||
3285 | /* Compute a hash value for searching the method cache. There | |
3286 | * are two variants for computing the hash value, a (rather) | |
3287 | * complicated one, and a simple one. For the complicated one | |
3288 | * explained below, tmp holds a number that is used in the | |
3289 | * computation. */ | |
3290 | if (SCM_INUMP (tmp)) | |
3291 | { | |
3292 | /* Use the signature of the actual arguments to determine | |
3293 | * the hash value. This is done as follows: Each class has | |
3294 | * an array of random numbers, that are determined when the | |
3295 | * class is created. The integer 'hashset' is an index into | |
3296 | * that array of random numbers. Now, from all classes that | |
3297 | * are part of the signature of the actual arguments, the | |
3298 | * random numbers at index 'hashset' are taken and summed | |
3299 | * up, giving the hash value. The value of 'hashset' is | |
3300 | * stored at the call to dispatch. This allows to have | |
3301 | * different 'formulas' for calculating the hash value at | |
3302 | * different places where dispatch is called. This allows | |
3303 | * to optimize the hash formula at every individual place | |
3304 | * where dispatch is called, such that hopefully the hash | |
3305 | * value that is computed will directly point to the right | |
3306 | * method in the method cache. */ | |
3307 | unsigned long int hashset = SCM_INUM (tmp); | |
3308 | unsigned long int counter = specializers + 1; | |
dff98306 | 3309 | SCM tmp_arg = arg1; |
f12745b6 DH |
3310 | hash_value = 0; |
3311 | while (!SCM_NULLP (tmp_arg) && counter != 0) | |
61364ba6 | 3312 | { |
f12745b6 DH |
3313 | SCM class = scm_class_of (SCM_CAR (tmp_arg)); |
3314 | hash_value += SCM_INSTANCE_HASH (class, hashset); | |
3315 | tmp_arg = SCM_CDR (tmp_arg); | |
3316 | counter--; | |
61364ba6 | 3317 | } |
f12745b6 DH |
3318 | z = SCM_CDDR (z); |
3319 | method_cache = SCM_CADR (z); | |
3320 | mask = SCM_INUM (SCM_CAR (z)); | |
3321 | hash_value &= mask; | |
3322 | cache_end_pos = hash_value; | |
3323 | } | |
3324 | else | |
3325 | { | |
3326 | /* This method of determining the hash value is much | |
3327 | * simpler: Set the hash value to zero and just perform a | |
3328 | * linear search through the method cache. */ | |
3329 | method_cache = tmp; | |
3330 | mask = (unsigned long int) ((long) -1); | |
3331 | hash_value = 0; | |
3332 | cache_end_pos = SCM_VECTOR_LENGTH (method_cache); | |
3333 | } | |
3334 | } | |
61364ba6 | 3335 | |
f12745b6 DH |
3336 | { |
3337 | /* Search the method cache for a method with a matching | |
3338 | * signature. Start the search at position 'hash_value'. The | |
3339 | * hashing implementation uses linear probing for conflict | |
3340 | * resolution, that is, if the signature in question is not | |
3341 | * found at the starting index in the hash table, the next table | |
3342 | * entry is tried, and so on, until in the worst case the whole | |
3343 | * cache has been searched, but still the signature has not been | |
3344 | * found. */ | |
3345 | SCM z; | |
3346 | do | |
3347 | { | |
dff98306 | 3348 | SCM args = arg1; /* list of arguments */ |
f12745b6 DH |
3349 | z = SCM_VELTS (method_cache)[hash_value]; |
3350 | while (!SCM_NULLP (args)) | |
61364ba6 MD |
3351 | { |
3352 | /* More arguments than specifiers => CLASS != ENV */ | |
f12745b6 DH |
3353 | SCM class_of_arg = scm_class_of (SCM_CAR (args)); |
3354 | if (!SCM_EQ_P (class_of_arg, SCM_CAR (z))) | |
61364ba6 | 3355 | goto next_method; |
f12745b6 | 3356 | args = SCM_CDR (args); |
61364ba6 MD |
3357 | z = SCM_CDR (z); |
3358 | } | |
f12745b6 DH |
3359 | /* Fewer arguments than specifiers => CAR != ENV */ |
3360 | if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))) | |
3361 | goto apply_cmethod; | |
3362 | next_method: | |
3363 | hash_value = (hash_value + 1) & mask; | |
3364 | } while (hash_value != cache_end_pos); | |
3365 | ||
3366 | /* No appropriate method was found in the cache. */ | |
dff98306 | 3367 | z = scm_memoize_method (x, arg1); |
f12745b6 | 3368 | |
dff98306 | 3369 | apply_cmethod: /* inputs: z, arg1 */ |
f12745b6 DH |
3370 | { |
3371 | SCM formals = SCM_CMETHOD_FORMALS (z); | |
821f18a4 | 3372 | env = SCM_EXTEND_ENV (formals, arg1, SCM_CMETHOD_ENV (z)); |
f12745b6 DH |
3373 | x = SCM_CMETHOD_BODY (z); |
3374 | goto nontoplevel_begin; | |
3375 | } | |
3376 | } | |
61364ba6 | 3377 | } |
73b64342 | 3378 | |
1d15ecd3 | 3379 | |
ca4be6ea MD |
3380 | case (SCM_ISYMNUM (SCM_IM_SLOT_REF)): |
3381 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3382 | { |
3383 | SCM instance = EVALCAR (x, env); | |
3384 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3385 | RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot])); | |
3386 | } | |
3387 | ||
3388 | ||
ca4be6ea MD |
3389 | case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X)): |
3390 | x = SCM_CDR (x); | |
1d15ecd3 DH |
3391 | { |
3392 | SCM instance = EVALCAR (x, env); | |
3393 | unsigned long int slot = SCM_INUM (SCM_CADR (x)); | |
3394 | SCM value = EVALCAR (SCM_CDDR (x), env); | |
3395 | SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value); | |
3396 | RETURN (SCM_UNSPECIFIED); | |
3397 | } | |
3398 | ||
c96d76b8 | 3399 | |
22721140 | 3400 | #if SCM_ENABLE_ELISP |
ca4be6ea | 3401 | |
73b64342 | 3402 | case (SCM_ISYMNUM (SCM_IM_NIL_COND)): |
1d15ecd3 DH |
3403 | { |
3404 | SCM test_form = SCM_CDR (x); | |
3405 | x = SCM_CDR (test_form); | |
3406 | while (!SCM_NULL_OR_NIL_P (x)) | |
3407 | { | |
3408 | SCM test_result = EVALCAR (test_form, env); | |
3409 | if (!(SCM_FALSEP (test_result) | |
3410 | || SCM_NULL_OR_NIL_P (test_result))) | |
3411 | { | |
3412 | if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED)) | |
3413 | RETURN (test_result); | |
3414 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3415 | goto carloop; | |
3416 | } | |
3417 | else | |
3418 | { | |
3419 | test_form = SCM_CDR (x); | |
3420 | x = SCM_CDR (test_form); | |
3421 | } | |
3422 | } | |
3423 | x = test_form; | |
3424 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3425 | goto carloop; | |
3426 | } | |
73b64342 | 3427 | |
c96d76b8 | 3428 | #endif /* SCM_ENABLE_ELISP */ |
73b64342 MD |
3429 | |
3430 | case (SCM_ISYMNUM (SCM_IM_BIND)): | |
2e171178 MV |
3431 | { |
3432 | SCM vars, exps, vals; | |
73b64342 | 3433 | |
2e171178 MV |
3434 | x = SCM_CDR (x); |
3435 | vars = SCM_CAAR (x); | |
3436 | exps = SCM_CDAR (x); | |
2e171178 | 3437 | vals = SCM_EOL; |
82b3e2c6 | 3438 | while (!SCM_NULLP (exps)) |
2e171178 MV |
3439 | { |
3440 | vals = scm_cons (EVALCAR (exps, env), vals); | |
3441 | exps = SCM_CDR (exps); | |
3442 | } | |
3443 | ||
3444 | scm_swap_bindings (vars, vals); | |
3445 | scm_dynwinds = scm_acons (vars, vals, scm_dynwinds); | |
1d15ecd3 DH |
3446 | |
3447 | /* Ignore all but the last evaluation result. */ | |
3448 | for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x)) | |
2e171178 | 3449 | { |
1d15ecd3 DH |
3450 | if (SCM_CONSP (SCM_CAR (x))) |
3451 | SCM_CEVAL (SCM_CAR (x), env); | |
2e171178 MV |
3452 | } |
3453 | proc = EVALCAR (x, env); | |
73b64342 | 3454 | |
2e171178 MV |
3455 | scm_dynwinds = SCM_CDR (scm_dynwinds); |
3456 | scm_swap_bindings (vars, vals); | |
73b64342 | 3457 | |
ddea3325 | 3458 | RETURN (proc); |
2e171178 | 3459 | } |
c96d76b8 | 3460 | |
1d15ecd3 | 3461 | |
a513ead3 MV |
3462 | case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)): |
3463 | { | |
9a069bdd DH |
3464 | SCM producer; |
3465 | ||
3466 | x = SCM_CDR (x); | |
3467 | producer = EVALCAR (x, env); | |
3468 | x = SCM_CDR (x); | |
3469 | proc = EVALCAR (x, env); /* proc is the consumer. */ | |
3470 | arg1 = SCM_APPLY (producer, SCM_EOL, SCM_EOL); | |
dff98306 | 3471 | if (SCM_VALUESP (arg1)) |
82b3e2c6 DH |
3472 | { |
3473 | /* The list of arguments is not copied. Rather, it is assumed | |
3474 | * that this has been done by the 'values' procedure. */ | |
3475 | arg1 = scm_struct_ref (arg1, SCM_INUM0); | |
3476 | } | |
a513ead3 | 3477 | else |
82b3e2c6 DH |
3478 | { |
3479 | arg1 = scm_list_1 (arg1); | |
3480 | } | |
9a069bdd DH |
3481 | PREP_APPLY (proc, arg1); |
3482 | goto apply_proc; | |
a513ead3 MV |
3483 | } |
3484 | ||
b7798e10 | 3485 | |
0f2d19dd | 3486 | default: |
ddd8f927 | 3487 | goto evapply; |
0f2d19dd JB |
3488 | } |
3489 | ||
89bff2fc | 3490 | |
0f2d19dd JB |
3491 | default: |
3492 | proc = x; | |
ddd8f927 | 3493 | goto evapply; |
82b3e2c6 | 3494 | |
89bff2fc | 3495 | |
0f2d19dd JB |
3496 | case scm_tc7_vector: |
3497 | case scm_tc7_wvect: | |
22721140 | 3498 | #if SCM_HAVE_ARRAYS |
0f2d19dd JB |
3499 | case scm_tc7_bvect: |
3500 | case scm_tc7_byvect: | |
3501 | case scm_tc7_svect: | |
3502 | case scm_tc7_ivect: | |
3503 | case scm_tc7_uvect: | |
3504 | case scm_tc7_fvect: | |
3505 | case scm_tc7_dvect: | |
3506 | case scm_tc7_cvect: | |
3d05f2e0 | 3507 | #if SCM_SIZEOF_LONG_LONG != 0 |
0f2d19dd | 3508 | case scm_tc7_llvect: |
afe5177e | 3509 | #endif |
0f2d19dd | 3510 | #endif |
534c55a9 | 3511 | case scm_tc7_number: |
0f2d19dd | 3512 | case scm_tc7_string: |
0f2d19dd JB |
3513 | case scm_tc7_smob: |
3514 | case scm_tcs_closures: | |
224822be | 3515 | case scm_tc7_cclo: |
89efbff4 | 3516 | case scm_tc7_pws: |
0f2d19dd | 3517 | case scm_tcs_subrs: |
904a077d | 3518 | case scm_tcs_struct: |
0f2d19dd JB |
3519 | RETURN (x); |
3520 | ||
89bff2fc DH |
3521 | case scm_tc7_symbol: |
3522 | /* Only happens when called at top level. */ | |
3523 | x = scm_cons (x, SCM_UNDEFINED); | |
3524 | RETURN (*scm_lookupcar (x, env, 1)); | |
3525 | ||
d22a0ea1 | 3526 | case scm_tc7_variable: |
a130e982 | 3527 | RETURN (SCM_VARIABLE_REF(x)); |
d22a0ea1 | 3528 | |
1b43d24c | 3529 | case SCM_BIT7 (SCM_ILOC00): |
0f2d19dd | 3530 | proc = *scm_ilookup (SCM_CAR (x), env); |
ddd8f927 | 3531 | goto checkmacro; |
b7798e10 | 3532 | |
0f2d19dd | 3533 | case scm_tcs_cons_nimcar: |
e050d4f8 | 3534 | if (SCM_SYMBOLP (SCM_CAR (x))) |
0f2d19dd | 3535 | { |
e050d4f8 | 3536 | SCM orig_sym = SCM_CAR (x); |
b7798e10 DH |
3537 | { |
3538 | SCM *location = scm_lookupcar1 (x, env, 1); | |
3539 | if (location == NULL) | |
3540 | { | |
3541 | /* we have lost the race, start again. */ | |
3542 | goto dispatch; | |
3543 | } | |
3544 | proc = *location; | |
3545 | } | |
f8769b1d | 3546 | |
22a52da1 | 3547 | if (SCM_MACROP (proc)) |
0f2d19dd | 3548 | { |
86d31dfe MV |
3549 | SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of |
3550 | lookupcar */ | |
e050d4f8 | 3551 | handle_a_macro: /* inputs: x, env, proc */ |
368bf056 | 3552 | #ifdef DEVAL |
7c354052 MD |
3553 | /* Set a flag during macro expansion so that macro |
3554 | application frames can be deleted from the backtrace. */ | |
3555 | SCM_SET_MACROEXP (debug); | |
368bf056 | 3556 | #endif |
dff98306 | 3557 | arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x, |
f8769b1d MV |
3558 | scm_cons (env, scm_listofnull)); |
3559 | ||
7c354052 MD |
3560 | #ifdef DEVAL |
3561 | SCM_CLEAR_MACROEXP (debug); | |
3562 | #endif | |
22a52da1 | 3563 | switch (SCM_MACRO_TYPE (proc)) |
0f2d19dd | 3564 | { |
3b88ed2a | 3565 | case 3: |
0f2d19dd | 3566 | case 2: |
dff98306 DH |
3567 | if (scm_ilength (arg1) <= 0) |
3568 | arg1 = scm_list_2 (SCM_IM_BEGIN, arg1); | |
6dbd0af5 | 3569 | #ifdef DEVAL |
22a52da1 | 3570 | if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc))) |
6dbd0af5 | 3571 | { |
6dbd0af5 | 3572 | SCM_DEFER_INTS; |
dff98306 DH |
3573 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3574 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
6dbd0af5 MD |
3575 | SCM_ALLOW_INTS; |
3576 | goto dispatch; | |
3577 | } | |
3578 | /* Prevent memoizing of debug info expression. */ | |
6203706f MD |
3579 | debug.info->e.exp = scm_cons_source (debug.info->e.exp, |
3580 | SCM_CAR (x), | |
3581 | SCM_CDR (x)); | |
6dbd0af5 | 3582 | #endif |
0f2d19dd | 3583 | SCM_DEFER_INTS; |
dff98306 DH |
3584 | SCM_SETCAR (x, SCM_CAR (arg1)); |
3585 | SCM_SETCDR (x, SCM_CDR (arg1)); | |
0f2d19dd | 3586 | SCM_ALLOW_INTS; |
680516ba DH |
3587 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); |
3588 | goto loop; | |
3063e30a | 3589 | #if SCM_ENABLE_DEPRECATED == 1 |
0f2d19dd | 3590 | case 1: |
680516ba DH |
3591 | x = arg1; |
3592 | if (SCM_NIMP (x)) | |
3593 | { | |
3594 | PREP_APPLY (SCM_UNDEFINED, SCM_EOL); | |
3595 | goto loop; | |
3596 | } | |
3597 | else | |
3598 | RETURN (arg1); | |
3063e30a | 3599 | #endif |
0f2d19dd | 3600 | case 0: |
dff98306 | 3601 | RETURN (arg1); |
0f2d19dd JB |
3602 | } |
3603 | } | |
3604 | } | |
3605 | else | |
3606 | proc = SCM_CEVAL (SCM_CAR (x), env); | |
bd987b8e | 3607 | |
ddd8f927 DH |
3608 | checkmacro: |
3609 | if (SCM_MACROP (proc)) | |
0f2d19dd | 3610 | goto handle_a_macro; |
0f2d19dd JB |
3611 | } |
3612 | ||
3613 | ||
e050d4f8 | 3614 | evapply: /* inputs: x, proc */ |
6dbd0af5 MD |
3615 | PREP_APPLY (proc, SCM_EOL); |
3616 | if (SCM_NULLP (SCM_CDR (x))) { | |
3617 | ENTER_APPLY; | |
89efbff4 | 3618 | evap0: |
ddd8f927 | 3619 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
0f2d19dd JB |
3620 | switch (SCM_TYP7 (proc)) |
3621 | { /* no arguments given */ | |
3622 | case scm_tc7_subr_0: | |
3623 | RETURN (SCM_SUBRF (proc) ()); | |
3624 | case scm_tc7_subr_1o: | |
3625 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED)); | |
3626 | case scm_tc7_lsubr: | |
3627 | RETURN (SCM_SUBRF (proc) (SCM_EOL)); | |
3628 | case scm_tc7_rpsubr: | |
3629 | RETURN (SCM_BOOL_T); | |
3630 | case scm_tc7_asubr: | |
3631 | RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED)); | |
0717dfd8 | 3632 | case scm_tc7_smob: |
68b06924 | 3633 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 3634 | goto badfun; |
68b06924 | 3635 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
0f2d19dd | 3636 | case scm_tc7_cclo: |
dff98306 | 3637 | arg1 = proc; |
0f2d19dd | 3638 | proc = SCM_CCLO_SUBR (proc); |
6dbd0af5 MD |
3639 | #ifdef DEVAL |
3640 | debug.info->a.proc = proc; | |
dff98306 | 3641 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3642 | #endif |
0f2d19dd | 3643 | goto evap1; |
89efbff4 MD |
3644 | case scm_tc7_pws: |
3645 | proc = SCM_PROCEDURE (proc); | |
3646 | #ifdef DEVAL | |
3647 | debug.info->a.proc = proc; | |
3648 | #endif | |
002f1a5d MD |
3649 | if (!SCM_CLOSUREP (proc)) |
3650 | goto evap0; | |
ddd8f927 | 3651 | /* fallthrough */ |
0f2d19dd | 3652 | case scm_tcs_closures: |
ddd8f927 DH |
3653 | { |
3654 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3655 | if (SCM_CONSP (formals)) | |
3656 | goto umwrongnumargs; | |
3657 | x = SCM_CLOSURE_BODY (proc); | |
3658 | env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc)); | |
3659 | goto nontoplevel_begin; | |
3660 | } | |
904a077d | 3661 | case scm_tcs_struct: |
195847fa MD |
3662 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
3663 | { | |
3664 | x = SCM_ENTITY_PROCEDURE (proc); | |
dff98306 | 3665 | arg1 = SCM_EOL; |
195847fa MD |
3666 | goto type_dispatch; |
3667 | } | |
2ca0d207 | 3668 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 3669 | { |
dff98306 | 3670 | arg1 = proc; |
195847fa MD |
3671 | proc = (SCM_I_ENTITYP (proc) |
3672 | ? SCM_ENTITY_PROCEDURE (proc) | |
3673 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 | 3674 | #ifdef DEVAL |
195847fa | 3675 | debug.info->a.proc = proc; |
dff98306 | 3676 | debug.info->a.args = scm_list_1 (arg1); |
da7f71d7 | 3677 | #endif |
ddd8f927 | 3678 | goto evap1; |
da7f71d7 | 3679 | } |
2ca0d207 DH |
3680 | else |
3681 | goto badfun; | |
0f2d19dd JB |
3682 | case scm_tc7_subr_1: |
3683 | case scm_tc7_subr_2: | |
3684 | case scm_tc7_subr_2o: | |
14b18ed6 | 3685 | case scm_tc7_dsubr: |
0f2d19dd JB |
3686 | case scm_tc7_cxr: |
3687 | case scm_tc7_subr_3: | |
3688 | case scm_tc7_lsubr_2: | |
3689 | umwrongnumargs: | |
3690 | unmemocar (x, env); | |
f5bf2977 | 3691 | scm_wrong_num_args (proc); |
0f2d19dd | 3692 | default: |
ddd8f927 DH |
3693 | badfun: |
3694 | scm_misc_error (NULL, "Wrong type to apply: ~S", scm_list_1 (proc)); | |
0f2d19dd | 3695 | } |
6dbd0af5 | 3696 | } |
0f2d19dd JB |
3697 | |
3698 | /* must handle macros by here */ | |
3699 | x = SCM_CDR (x); | |
dff98306 DH |
3700 | if (SCM_CONSP (x)) |
3701 | arg1 = EVALCAR (x, env); | |
680ed4a8 | 3702 | else |
ab1f1094 | 3703 | scm_wrong_num_args (proc); |
6dbd0af5 | 3704 | #ifdef DEVAL |
dff98306 | 3705 | debug.info->a.args = scm_list_1 (arg1); |
6dbd0af5 | 3706 | #endif |
0f2d19dd | 3707 | x = SCM_CDR (x); |
42030fb2 DH |
3708 | { |
3709 | SCM arg2; | |
3710 | if (SCM_NULLP (x)) | |
3711 | { | |
3712 | ENTER_APPLY; | |
3713 | evap1: /* inputs: proc, arg1 */ | |
ddd8f927 | 3714 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3715 | switch (SCM_TYP7 (proc)) |
3716 | { /* have one argument in arg1 */ | |
3717 | case scm_tc7_subr_2o: | |
3718 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3719 | case scm_tc7_subr_1: | |
3720 | case scm_tc7_subr_1o: | |
3721 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
3722 | case scm_tc7_dsubr: |
3723 | if (SCM_INUMP (arg1)) | |
3724 | { | |
3725 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
3726 | } | |
3727 | else if (SCM_REALP (arg1)) | |
3728 | { | |
3729 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
3730 | } | |
3731 | else if (SCM_BIGP (arg1)) | |
3732 | { | |
3733 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
3734 | } | |
3735 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
3736 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
42030fb2 | 3737 | case scm_tc7_cxr: |
42030fb2 | 3738 | { |
14b18ed6 DH |
3739 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
3740 | do | |
3741 | { | |
3742 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
3743 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
3744 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
3745 | pattern >>= 2; | |
3746 | } while (pattern); | |
42030fb2 | 3747 | RETURN (arg1); |
0f2d19dd | 3748 | } |
42030fb2 DH |
3749 | case scm_tc7_rpsubr: |
3750 | RETURN (SCM_BOOL_T); | |
3751 | case scm_tc7_asubr: | |
3752 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); | |
3753 | case scm_tc7_lsubr: | |
0f2d19dd | 3754 | #ifdef DEVAL |
42030fb2 | 3755 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
0f2d19dd | 3756 | #else |
42030fb2 | 3757 | RETURN (SCM_SUBRF (proc) (scm_list_1 (arg1))); |
0f2d19dd | 3758 | #endif |
42030fb2 DH |
3759 | case scm_tc7_smob: |
3760 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3761 | goto badfun; | |
3762 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); | |
3763 | case scm_tc7_cclo: | |
3764 | arg2 = arg1; | |
3765 | arg1 = proc; | |
3766 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 3767 | #ifdef DEVAL |
42030fb2 DH |
3768 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3769 | debug.info->a.proc = proc; | |
6dbd0af5 | 3770 | #endif |
42030fb2 DH |
3771 | goto evap2; |
3772 | case scm_tc7_pws: | |
3773 | proc = SCM_PROCEDURE (proc); | |
89efbff4 | 3774 | #ifdef DEVAL |
42030fb2 | 3775 | debug.info->a.proc = proc; |
89efbff4 | 3776 | #endif |
42030fb2 DH |
3777 | if (!SCM_CLOSUREP (proc)) |
3778 | goto evap1; | |
ddd8f927 | 3779 | /* fallthrough */ |
42030fb2 | 3780 | case scm_tcs_closures: |
ddd8f927 DH |
3781 | { |
3782 | /* clos1: */ | |
3783 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3784 | if (SCM_NULLP (formals) | |
3785 | || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals)))) | |
3786 | goto umwrongnumargs; | |
3787 | x = SCM_CLOSURE_BODY (proc); | |
0f2d19dd | 3788 | #ifdef DEVAL |
ddd8f927 DH |
3789 | env = SCM_EXTEND_ENV (formals, |
3790 | debug.info->a.args, | |
3791 | SCM_ENV (proc)); | |
0f2d19dd | 3792 | #else |
ddd8f927 DH |
3793 | env = SCM_EXTEND_ENV (formals, |
3794 | scm_list_1 (arg1), | |
3795 | SCM_ENV (proc)); | |
0f2d19dd | 3796 | #endif |
ddd8f927 DH |
3797 | goto nontoplevel_begin; |
3798 | } | |
42030fb2 DH |
3799 | case scm_tcs_struct: |
3800 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3801 | { | |
3802 | x = SCM_ENTITY_PROCEDURE (proc); | |
f3d2630a | 3803 | #ifdef DEVAL |
42030fb2 | 3804 | arg1 = debug.info->a.args; |
f3d2630a | 3805 | #else |
42030fb2 | 3806 | arg1 = scm_list_1 (arg1); |
f3d2630a | 3807 | #endif |
42030fb2 DH |
3808 | goto type_dispatch; |
3809 | } | |
2ca0d207 | 3810 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3811 | { |
3812 | arg2 = arg1; | |
3813 | arg1 = proc; | |
3814 | proc = (SCM_I_ENTITYP (proc) | |
3815 | ? SCM_ENTITY_PROCEDURE (proc) | |
3816 | : SCM_OPERATOR_PROCEDURE (proc)); | |
0c32d76c | 3817 | #ifdef DEVAL |
42030fb2 DH |
3818 | debug.info->a.args = scm_cons (arg1, debug.info->a.args); |
3819 | debug.info->a.proc = proc; | |
0c32d76c | 3820 | #endif |
ddd8f927 | 3821 | goto evap2; |
42030fb2 | 3822 | } |
2ca0d207 DH |
3823 | else |
3824 | goto badfun; | |
42030fb2 DH |
3825 | case scm_tc7_subr_2: |
3826 | case scm_tc7_subr_0: | |
3827 | case scm_tc7_subr_3: | |
3828 | case scm_tc7_lsubr_2: | |
ab1f1094 | 3829 | scm_wrong_num_args (proc); |
42030fb2 DH |
3830 | default: |
3831 | goto badfun; | |
3832 | } | |
3833 | } | |
42030fb2 DH |
3834 | if (SCM_CONSP (x)) |
3835 | arg2 = EVALCAR (x, env); | |
3836 | else | |
ab1f1094 | 3837 | scm_wrong_num_args (proc); |
bd987b8e | 3838 | |
42030fb2 | 3839 | { /* have two or more arguments */ |
6dbd0af5 | 3840 | #ifdef DEVAL |
42030fb2 | 3841 | debug.info->a.args = scm_list_2 (arg1, arg2); |
6dbd0af5 | 3842 | #endif |
42030fb2 DH |
3843 | x = SCM_CDR (x); |
3844 | if (SCM_NULLP (x)) { | |
3845 | ENTER_APPLY; | |
3846 | evap2: | |
ddd8f927 | 3847 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3848 | switch (SCM_TYP7 (proc)) |
3849 | { /* have two arguments */ | |
3850 | case scm_tc7_subr_2: | |
3851 | case scm_tc7_subr_2o: | |
3852 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3853 | case scm_tc7_lsubr: | |
0f2d19dd | 3854 | #ifdef DEVAL |
42030fb2 | 3855 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); |
6dbd0af5 | 3856 | #else |
42030fb2 DH |
3857 | RETURN (SCM_SUBRF (proc) (scm_list_2 (arg1, arg2))); |
3858 | #endif | |
3859 | case scm_tc7_lsubr_2: | |
3860 | RETURN (SCM_SUBRF (proc) (arg1, arg2, SCM_EOL)); | |
3861 | case scm_tc7_rpsubr: | |
3862 | case scm_tc7_asubr: | |
3863 | RETURN (SCM_SUBRF (proc) (arg1, arg2)); | |
3864 | case scm_tc7_smob: | |
3865 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
3866 | goto badfun; | |
3867 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, arg2)); | |
3868 | cclon: | |
3869 | case scm_tc7_cclo: | |
0f2d19dd | 3870 | #ifdef DEVAL |
42030fb2 DH |
3871 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3872 | scm_cons (proc, debug.info->a.args), | |
3873 | SCM_EOL)); | |
0f2d19dd | 3874 | #else |
42030fb2 DH |
3875 | RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc), |
3876 | scm_cons2 (proc, arg1, | |
3877 | scm_cons (arg2, | |
3878 | scm_eval_args (x, | |
3879 | env, | |
3880 | proc))), | |
3881 | SCM_EOL)); | |
3882 | #endif | |
3883 | case scm_tcs_struct: | |
3884 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
3885 | { | |
3886 | x = SCM_ENTITY_PROCEDURE (proc); | |
3887 | #ifdef DEVAL | |
3888 | arg1 = debug.info->a.args; | |
3889 | #else | |
3890 | arg1 = scm_list_2 (arg1, arg2); | |
6dbd0af5 | 3891 | #endif |
42030fb2 DH |
3892 | goto type_dispatch; |
3893 | } | |
2ca0d207 | 3894 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 DH |
3895 | { |
3896 | operatorn: | |
f3d2630a | 3897 | #ifdef DEVAL |
42030fb2 DH |
3898 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3899 | ? SCM_ENTITY_PROCEDURE (proc) | |
3900 | : SCM_OPERATOR_PROCEDURE (proc), | |
3901 | scm_cons (proc, debug.info->a.args), | |
3902 | SCM_EOL)); | |
f3d2630a | 3903 | #else |
42030fb2 DH |
3904 | RETURN (SCM_APPLY (SCM_I_ENTITYP (proc) |
3905 | ? SCM_ENTITY_PROCEDURE (proc) | |
3906 | : SCM_OPERATOR_PROCEDURE (proc), | |
3907 | scm_cons2 (proc, arg1, | |
3908 | scm_cons (arg2, | |
3909 | scm_eval_args (x, | |
3910 | env, | |
3911 | proc))), | |
3912 | SCM_EOL)); | |
f3d2630a | 3913 | #endif |
42030fb2 | 3914 | } |
2ca0d207 DH |
3915 | else |
3916 | goto badfun; | |
42030fb2 | 3917 | case scm_tc7_subr_0: |
14b18ed6 | 3918 | case scm_tc7_dsubr: |
42030fb2 DH |
3919 | case scm_tc7_cxr: |
3920 | case scm_tc7_subr_1o: | |
3921 | case scm_tc7_subr_1: | |
3922 | case scm_tc7_subr_3: | |
ab1f1094 | 3923 | scm_wrong_num_args (proc); |
42030fb2 | 3924 | default: |
9b07e212 | 3925 | goto badfun; |
42030fb2 DH |
3926 | case scm_tc7_pws: |
3927 | proc = SCM_PROCEDURE (proc); | |
3928 | #ifdef DEVAL | |
3929 | debug.info->a.proc = proc; | |
3930 | #endif | |
3931 | if (!SCM_CLOSUREP (proc)) | |
3932 | goto evap2; | |
ddd8f927 | 3933 | /* fallthrough */ |
42030fb2 | 3934 | case scm_tcs_closures: |
ddd8f927 DH |
3935 | { |
3936 | /* clos2: */ | |
3937 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
3938 | if (SCM_NULLP (formals) | |
3939 | || (SCM_CONSP (formals) | |
3940 | && (SCM_NULLP (SCM_CDR (formals)) | |
3941 | || (SCM_CONSP (SCM_CDR (formals)) | |
3942 | && SCM_CONSP (SCM_CDDR (formals)))))) | |
3943 | goto umwrongnumargs; | |
0c32d76c | 3944 | #ifdef DEVAL |
ddd8f927 DH |
3945 | env = SCM_EXTEND_ENV (formals, |
3946 | debug.info->a.args, | |
3947 | SCM_ENV (proc)); | |
195847fa | 3948 | #else |
ddd8f927 DH |
3949 | env = SCM_EXTEND_ENV (formals, |
3950 | scm_list_2 (arg1, arg2), | |
3951 | SCM_ENV (proc)); | |
195847fa | 3952 | #endif |
ddd8f927 DH |
3953 | x = SCM_CLOSURE_BODY (proc); |
3954 | goto nontoplevel_begin; | |
3955 | } | |
42030fb2 DH |
3956 | } |
3957 | } | |
42030fb2 | 3958 | if (!SCM_CONSP (x)) |
ab1f1094 | 3959 | scm_wrong_num_args (proc); |
42030fb2 DH |
3960 | #ifdef DEVAL |
3961 | debug.info->a.args = scm_cons2 (arg1, arg2, | |
3962 | deval_args (x, env, proc, | |
3963 | SCM_CDRLOC (SCM_CDR (debug.info->a.args)))); | |
3964 | #endif | |
3965 | ENTER_APPLY; | |
3966 | evap3: | |
ddd8f927 | 3967 | SCM_ASRTGO (!SCM_IMP (proc), badfun); |
42030fb2 DH |
3968 | switch (SCM_TYP7 (proc)) |
3969 | { /* have 3 or more arguments */ | |
3970 | #ifdef DEVAL | |
6dbd0af5 | 3971 | case scm_tc7_subr_3: |
ab1f1094 DH |
3972 | if (!SCM_NULLP (SCM_CDR (x))) |
3973 | scm_wrong_num_args (proc); | |
3974 | else | |
3975 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
3976 | SCM_CADDR (debug.info->a.args))); | |
42030fb2 DH |
3977 | case scm_tc7_asubr: |
3978 | arg1 = SCM_SUBRF(proc)(arg1, arg2); | |
3979 | arg2 = SCM_CDDR (debug.info->a.args); | |
3980 | do | |
3981 | { | |
3982 | arg1 = SCM_SUBRF(proc)(arg1, SCM_CAR (arg2)); | |
3983 | arg2 = SCM_CDR (arg2); | |
3984 | } | |
3985 | while (SCM_NIMP (arg2)); | |
3986 | RETURN (arg1); | |
3987 | case scm_tc7_rpsubr: | |
3988 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
3989 | RETURN (SCM_BOOL_F); | |
3990 | arg1 = SCM_CDDR (debug.info->a.args); | |
3991 | do | |
3992 | { | |
3993 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1)))) | |
3994 | RETURN (SCM_BOOL_F); | |
3995 | arg2 = SCM_CAR (arg1); | |
3996 | arg1 = SCM_CDR (arg1); | |
3997 | } | |
3998 | while (SCM_NIMP (arg1)); | |
3999 | RETURN (SCM_BOOL_T); | |
4000 | case scm_tc7_lsubr_2: | |
4001 | RETURN (SCM_SUBRF (proc) (arg1, arg2, | |
4002 | SCM_CDDR (debug.info->a.args))); | |
4003 | case scm_tc7_lsubr: | |
4004 | RETURN (SCM_SUBRF (proc) (debug.info->a.args)); | |
4005 | case scm_tc7_smob: | |
4006 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4007 | goto badfun; | |
4008 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4009 | SCM_CDDR (debug.info->a.args))); | |
4010 | case scm_tc7_cclo: | |
4011 | goto cclon; | |
002f1a5d MD |
4012 | case scm_tc7_pws: |
4013 | proc = SCM_PROCEDURE (proc); | |
002f1a5d | 4014 | debug.info->a.proc = proc; |
002f1a5d | 4015 | if (!SCM_CLOSUREP (proc)) |
42030fb2 | 4016 | goto evap3; |
ddd8f927 | 4017 | /* fallthrough */ |
6dbd0af5 | 4018 | case scm_tcs_closures: |
ddd8f927 DH |
4019 | { |
4020 | const SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4021 | if (SCM_NULLP (formals) | |
4022 | || (SCM_CONSP (formals) | |
4023 | && (SCM_NULLP (SCM_CDR (formals)) | |
4024 | || (SCM_CONSP (SCM_CDR (formals)) | |
4025 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4026 | goto umwrongnumargs; | |
4027 | SCM_SET_ARGSREADY (debug); | |
4028 | env = SCM_EXTEND_ENV (formals, | |
4029 | debug.info->a.args, | |
4030 | SCM_ENV (proc)); | |
4031 | x = SCM_CLOSURE_BODY (proc); | |
4032 | goto nontoplevel_begin; | |
4033 | } | |
6dbd0af5 | 4034 | #else /* DEVAL */ |
42030fb2 | 4035 | case scm_tc7_subr_3: |
ab1f1094 DH |
4036 | if (!SCM_NULLP (SCM_CDR (x))) |
4037 | scm_wrong_num_args (proc); | |
4038 | else | |
4039 | RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env))); | |
42030fb2 DH |
4040 | case scm_tc7_asubr: |
4041 | arg1 = SCM_SUBRF (proc) (arg1, arg2); | |
4042 | do | |
4043 | { | |
4044 | arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env)); | |
4045 | x = SCM_CDR(x); | |
4046 | } | |
4047 | while (SCM_NIMP (x)); | |
4048 | RETURN (arg1); | |
4049 | case scm_tc7_rpsubr: | |
4050 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2))) | |
4051 | RETURN (SCM_BOOL_F); | |
4052 | do | |
4053 | { | |
4054 | arg1 = EVALCAR (x, env); | |
4055 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1))) | |
4056 | RETURN (SCM_BOOL_F); | |
4057 | arg2 = arg1; | |
4058 | x = SCM_CDR (x); | |
4059 | } | |
4060 | while (SCM_NIMP (x)); | |
4061 | RETURN (SCM_BOOL_T); | |
4062 | case scm_tc7_lsubr_2: | |
4063 | RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc))); | |
4064 | case scm_tc7_lsubr: | |
4065 | RETURN (SCM_SUBRF (proc) (scm_cons2 (arg1, | |
4066 | arg2, | |
4067 | scm_eval_args (x, env, proc)))); | |
4068 | case scm_tc7_smob: | |
4069 | if (!SCM_SMOB_APPLICABLE_P (proc)) | |
4070 | goto badfun; | |
4071 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, arg2, | |
4072 | scm_eval_args (x, env, proc))); | |
4073 | case scm_tc7_cclo: | |
4074 | goto cclon; | |
4075 | case scm_tc7_pws: | |
4076 | proc = SCM_PROCEDURE (proc); | |
4077 | if (!SCM_CLOSUREP (proc)) | |
4078 | goto evap3; | |
ddd8f927 DH |
4079 | /* fallthrough */ |
4080 | case scm_tcs_closures: | |
da7f71d7 | 4081 | { |
ddd8f927 | 4082 | const SCM formals = SCM_CLOSURE_FORMALS (proc); |
42030fb2 DH |
4083 | if (SCM_NULLP (formals) |
4084 | || (SCM_CONSP (formals) | |
4085 | && (SCM_NULLP (SCM_CDR (formals)) | |
4086 | || (SCM_CONSP (SCM_CDR (formals)) | |
4087 | && scm_badargsp (SCM_CDDR (formals), x))))) | |
4088 | goto umwrongnumargs; | |
ddd8f927 DH |
4089 | env = SCM_EXTEND_ENV (formals, |
4090 | scm_cons2 (arg1, | |
4091 | arg2, | |
4092 | scm_eval_args (x, env, proc)), | |
4093 | SCM_ENV (proc)); | |
4094 | x = SCM_CLOSURE_BODY (proc); | |
4095 | goto nontoplevel_begin; | |
da7f71d7 | 4096 | } |
0f2d19dd | 4097 | #endif /* DEVAL */ |
42030fb2 DH |
4098 | case scm_tcs_struct: |
4099 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
4100 | { | |
f3d2630a | 4101 | #ifdef DEVAL |
42030fb2 | 4102 | arg1 = debug.info->a.args; |
f3d2630a | 4103 | #else |
42030fb2 | 4104 | arg1 = scm_cons2 (arg1, arg2, scm_eval_args (x, env, proc)); |
f3d2630a | 4105 | #endif |
42030fb2 DH |
4106 | x = SCM_ENTITY_PROCEDURE (proc); |
4107 | goto type_dispatch; | |
4108 | } | |
2ca0d207 | 4109 | else if (SCM_I_OPERATORP (proc)) |
42030fb2 | 4110 | goto operatorn; |
2ca0d207 DH |
4111 | else |
4112 | goto badfun; | |
42030fb2 DH |
4113 | case scm_tc7_subr_2: |
4114 | case scm_tc7_subr_1o: | |
4115 | case scm_tc7_subr_2o: | |
4116 | case scm_tc7_subr_0: | |
14b18ed6 | 4117 | case scm_tc7_dsubr: |
42030fb2 DH |
4118 | case scm_tc7_cxr: |
4119 | case scm_tc7_subr_1: | |
ab1f1094 | 4120 | scm_wrong_num_args (proc); |
42030fb2 | 4121 | default: |
9b07e212 | 4122 | goto badfun; |
42030fb2 DH |
4123 | } |
4124 | } | |
0f2d19dd JB |
4125 | } |
4126 | #ifdef DEVAL | |
6dbd0af5 | 4127 | exit: |
5132eef0 | 4128 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4129 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4130 | { |
b7ff98dd MD |
4131 | SCM_CLEAR_TRACED_FRAME (debug); |
4132 | if (SCM_CHEAPTRAPS_P) | |
dff98306 | 4133 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4134 | else |
4135 | { | |
5f144b10 GH |
4136 | int first; |
4137 | SCM val = scm_make_continuation (&first); | |
e050d4f8 | 4138 | |
5f144b10 | 4139 | if (first) |
dff98306 | 4140 | arg1 = val; |
5f144b10 | 4141 | else |
6dbd0af5 | 4142 | { |
5f144b10 | 4143 | proc = val; |
6dbd0af5 MD |
4144 | goto ret; |
4145 | } | |
4146 | } | |
d95c0b76 | 4147 | SCM_TRAPS_P = 0; |
dff98306 | 4148 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); |
d95c0b76 | 4149 | SCM_TRAPS_P = 1; |
6dbd0af5 MD |
4150 | } |
4151 | ret: | |
1646d37b | 4152 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4153 | return proc; |
4154 | #endif | |
4155 | } | |
4156 | ||
6dbd0af5 MD |
4157 | |
4158 | /* SECTION: This code is compiled once. | |
4159 | */ | |
4160 | ||
0f2d19dd JB |
4161 | #ifndef DEVAL |
4162 | ||
fdc28395 | 4163 | \f |
d0b07b5d | 4164 | |
fdc28395 KN |
4165 | /* Simple procedure calls |
4166 | */ | |
4167 | ||
4168 | SCM | |
4169 | scm_call_0 (SCM proc) | |
4170 | { | |
4171 | return scm_apply (proc, SCM_EOL, SCM_EOL); | |
4172 | } | |
4173 | ||
4174 | SCM | |
4175 | scm_call_1 (SCM proc, SCM arg1) | |
4176 | { | |
4177 | return scm_apply (proc, arg1, scm_listofnull); | |
4178 | } | |
4179 | ||
4180 | SCM | |
4181 | scm_call_2 (SCM proc, SCM arg1, SCM arg2) | |
4182 | { | |
4183 | return scm_apply (proc, arg1, scm_cons (arg2, scm_listofnull)); | |
4184 | } | |
4185 | ||
4186 | SCM | |
4187 | scm_call_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3) | |
4188 | { | |
4189 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, scm_listofnull)); | |
4190 | } | |
4191 | ||
d95c0b76 NJ |
4192 | SCM |
4193 | scm_call_4 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM arg4) | |
4194 | { | |
4195 | return scm_apply (proc, arg1, scm_cons2 (arg2, arg3, | |
4196 | scm_cons (arg4, scm_listofnull))); | |
4197 | } | |
4198 | ||
fdc28395 KN |
4199 | /* Simple procedure applies |
4200 | */ | |
4201 | ||
4202 | SCM | |
4203 | scm_apply_0 (SCM proc, SCM args) | |
4204 | { | |
4205 | return scm_apply (proc, args, SCM_EOL); | |
4206 | } | |
4207 | ||
4208 | SCM | |
4209 | scm_apply_1 (SCM proc, SCM arg1, SCM args) | |
4210 | { | |
4211 | return scm_apply (proc, scm_cons (arg1, args), SCM_EOL); | |
4212 | } | |
4213 | ||
4214 | SCM | |
4215 | scm_apply_2 (SCM proc, SCM arg1, SCM arg2, SCM args) | |
4216 | { | |
4217 | return scm_apply (proc, scm_cons2 (arg1, arg2, args), SCM_EOL); | |
4218 | } | |
4219 | ||
4220 | SCM | |
4221 | scm_apply_3 (SCM proc, SCM arg1, SCM arg2, SCM arg3, SCM args) | |
4222 | { | |
4223 | return scm_apply (proc, scm_cons (arg1, scm_cons2 (arg2, arg3, args)), | |
4224 | SCM_EOL); | |
4225 | } | |
4226 | ||
82a2622a | 4227 | /* This code processes the arguments to apply: |
b145c172 JB |
4228 | |
4229 | (apply PROC ARG1 ... ARGS) | |
4230 | ||
82a2622a JB |
4231 | Given a list (ARG1 ... ARGS), this function conses the ARG1 |
4232 | ... arguments onto the front of ARGS, and returns the resulting | |
4233 | list. Note that ARGS is a list; thus, the argument to this | |
4234 | function is a list whose last element is a list. | |
4235 | ||
4236 | Apply calls this function, and applies PROC to the elements of the | |
b145c172 JB |
4237 | result. apply:nconc2last takes care of building the list of |
4238 | arguments, given (ARG1 ... ARGS). | |
4239 | ||
82a2622a JB |
4240 | Rather than do new consing, apply:nconc2last destroys its argument. |
4241 | On that topic, this code came into my care with the following | |
4242 | beautifully cryptic comment on that topic: "This will only screw | |
4243 | you if you do (scm_apply scm_apply '( ... ))" If you know what | |
4244 | they're referring to, send me a patch to this comment. */ | |
b145c172 | 4245 | |
3b3b36dd | 4246 | SCM_DEFINE (scm_nconc2last, "apply:nconc2last", 1, 0, 0, |
b3f26b14 MG |
4247 | (SCM lst), |
4248 | "Given a list (@var{arg1} @dots{} @var{args}), this function\n" | |
4249 | "conses the @var{arg1} @dots{} arguments onto the front of\n" | |
4250 | "@var{args}, and returns the resulting list. Note that\n" | |
4251 | "@var{args} is a list; thus, the argument to this function is\n" | |
4252 | "a list whose last element is a list.\n" | |
4253 | "Note: Rather than do new consing, @code{apply:nconc2last}\n" | |
4254 | "destroys its argument, so use with care.") | |
1bbd0b84 | 4255 | #define FUNC_NAME s_scm_nconc2last |
0f2d19dd JB |
4256 | { |
4257 | SCM *lloc; | |
34d19ef6 | 4258 | SCM_VALIDATE_NONEMPTYLIST (1, lst); |
0f2d19dd | 4259 | lloc = &lst; |
c96d76b8 NJ |
4260 | while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be |
4261 | SCM_NULL_OR_NIL_P, but not | |
4262 | needed in 99.99% of cases, | |
4263 | and it could seriously hurt | |
4264 | performance. - Neil */ | |
a23afe53 | 4265 | lloc = SCM_CDRLOC (*lloc); |
1bbd0b84 | 4266 | SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, FUNC_NAME); |
0f2d19dd JB |
4267 | *lloc = SCM_CAR (*lloc); |
4268 | return lst; | |
4269 | } | |
1bbd0b84 | 4270 | #undef FUNC_NAME |
0f2d19dd JB |
4271 | |
4272 | #endif /* !DEVAL */ | |
4273 | ||
6dbd0af5 MD |
4274 | |
4275 | /* SECTION: When DEVAL is defined this code yields scm_dapply. | |
4276 | * It is compiled twice. | |
4277 | */ | |
4278 | ||
0f2d19dd | 4279 | #if 0 |
0f2d19dd | 4280 | SCM |
6e8d25a6 | 4281 | scm_apply (SCM proc, SCM arg1, SCM args) |
0f2d19dd JB |
4282 | {} |
4283 | #endif | |
4284 | ||
4285 | #if 0 | |
0f2d19dd | 4286 | SCM |
6e8d25a6 | 4287 | scm_dapply (SCM proc, SCM arg1, SCM args) |
d0b07b5d | 4288 | {} |
0f2d19dd JB |
4289 | #endif |
4290 | ||
1cc91f1b | 4291 | |
82a2622a JB |
4292 | /* Apply a function to a list of arguments. |
4293 | ||
4294 | This function is exported to the Scheme level as taking two | |
4295 | required arguments and a tail argument, as if it were: | |
4296 | (lambda (proc arg1 . args) ...) | |
4297 | Thus, if you just have a list of arguments to pass to a procedure, | |
4298 | pass the list as ARG1, and '() for ARGS. If you have some fixed | |
4299 | args, pass the first as ARG1, then cons any remaining fixed args | |
4300 | onto the front of your argument list, and pass that as ARGS. */ | |
4301 | ||
0f2d19dd | 4302 | SCM |
1bbd0b84 | 4303 | SCM_APPLY (SCM proc, SCM arg1, SCM args) |
0f2d19dd | 4304 | { |
0f2d19dd | 4305 | #ifdef DEVAL |
92c2555f MV |
4306 | scm_t_debug_frame debug; |
4307 | scm_t_debug_info debug_vect_body; | |
1646d37b | 4308 | debug.prev = scm_last_debug_frame; |
b7ff98dd | 4309 | debug.status = SCM_APPLYFRAME; |
c0ab1b8d | 4310 | debug.vect = &debug_vect_body; |
6dbd0af5 MD |
4311 | debug.vect[0].a.proc = proc; |
4312 | debug.vect[0].a.args = SCM_EOL; | |
1646d37b | 4313 | scm_last_debug_frame = &debug; |
0f2d19dd | 4314 | #else |
b7ff98dd | 4315 | if (SCM_DEBUGGINGP) |
0f2d19dd | 4316 | return scm_dapply (proc, arg1, args); |
0f2d19dd JB |
4317 | #endif |
4318 | ||
4319 | SCM_ASRTGO (SCM_NIMP (proc), badproc); | |
82a2622a JB |
4320 | |
4321 | /* If ARGS is the empty list, then we're calling apply with only two | |
4322 | arguments --- ARG1 is the list of arguments for PROC. Whatever | |
4323 | the case, futz with things so that ARG1 is the first argument to | |
4324 | give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the | |
30000774 JB |
4325 | rest. |
4326 | ||
4327 | Setting the debug apply frame args this way is pretty messy. | |
4328 | Perhaps we should store arg1 and args directly in the frame as | |
4329 | received, and let scm_frame_arguments unpack them, because that's | |
4330 | a relatively rare operation. This works for now; if the Guile | |
4331 | developer archives are still around, see Mikael's post of | |
4332 | 11-Apr-97. */ | |
0f2d19dd JB |
4333 | if (SCM_NULLP (args)) |
4334 | { | |
4335 | if (SCM_NULLP (arg1)) | |
30000774 JB |
4336 | { |
4337 | arg1 = SCM_UNDEFINED; | |
4338 | #ifdef DEVAL | |
4339 | debug.vect[0].a.args = SCM_EOL; | |
4340 | #endif | |
4341 | } | |
0f2d19dd JB |
4342 | else |
4343 | { | |
30000774 JB |
4344 | #ifdef DEVAL |
4345 | debug.vect[0].a.args = arg1; | |
4346 | #endif | |
0f2d19dd JB |
4347 | args = SCM_CDR (arg1); |
4348 | arg1 = SCM_CAR (arg1); | |
4349 | } | |
4350 | } | |
4351 | else | |
4352 | { | |
0f2d19dd | 4353 | args = scm_nconc2last (args); |
30000774 JB |
4354 | #ifdef DEVAL |
4355 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4356 | #endif | |
0f2d19dd | 4357 | } |
0f2d19dd | 4358 | #ifdef DEVAL |
b6d75948 | 4359 | if (SCM_ENTER_FRAME_P && SCM_TRAPS_P) |
6dbd0af5 MD |
4360 | { |
4361 | SCM tmp; | |
b7ff98dd | 4362 | if (SCM_CHEAPTRAPS_P) |
c0ab1b8d | 4363 | tmp = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4364 | else |
4365 | { | |
5f144b10 GH |
4366 | int first; |
4367 | ||
4368 | tmp = scm_make_continuation (&first); | |
4369 | if (!first) | |
6dbd0af5 MD |
4370 | goto entap; |
4371 | } | |
d95c0b76 NJ |
4372 | SCM_TRAPS_P = 0; |
4373 | scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp); | |
4374 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4375 | } |
4376 | entap: | |
4377 | ENTER_APPLY; | |
4378 | #endif | |
6dbd0af5 | 4379 | tail: |
0f2d19dd JB |
4380 | switch (SCM_TYP7 (proc)) |
4381 | { | |
4382 | case scm_tc7_subr_2o: | |
4383 | args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args); | |
ddea3325 | 4384 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4385 | case scm_tc7_subr_2: |
ab1f1094 DH |
4386 | if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args))) |
4387 | scm_wrong_num_args (proc); | |
0f2d19dd | 4388 | args = SCM_CAR (args); |
ddea3325 | 4389 | RETURN (SCM_SUBRF (proc) (arg1, args)); |
0f2d19dd | 4390 | case scm_tc7_subr_0: |
ab1f1094 DH |
4391 | if (!SCM_UNBNDP (arg1)) |
4392 | scm_wrong_num_args (proc); | |
4393 | else | |
4394 | RETURN (SCM_SUBRF (proc) ()); | |
0f2d19dd | 4395 | case scm_tc7_subr_1: |
ab1f1094 DH |
4396 | if (SCM_UNBNDP (arg1)) |
4397 | scm_wrong_num_args (proc); | |
0f2d19dd | 4398 | case scm_tc7_subr_1o: |
ab1f1094 DH |
4399 | if (!SCM_NULLP (args)) |
4400 | scm_wrong_num_args (proc); | |
4401 | else | |
4402 | RETURN (SCM_SUBRF (proc) (arg1)); | |
14b18ed6 DH |
4403 | case scm_tc7_dsubr: |
4404 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) | |
4405 | scm_wrong_num_args (proc); | |
4406 | if (SCM_INUMP (arg1)) | |
4407 | { | |
4408 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4409 | } | |
4410 | else if (SCM_REALP (arg1)) | |
4411 | { | |
4412 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4413 | } | |
4414 | else if (SCM_BIGP (arg1)) | |
4415 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
4416 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, | |
4417 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
0f2d19dd | 4418 | case scm_tc7_cxr: |
ab1f1094 DH |
4419 | if (SCM_UNBNDP (arg1) || !SCM_NULLP (args)) |
4420 | scm_wrong_num_args (proc); | |
0f2d19dd | 4421 | { |
14b18ed6 DH |
4422 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4423 | do | |
4424 | { | |
4425 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4426 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4427 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4428 | pattern >>= 2; | |
4429 | } while (pattern); | |
4430 | RETURN (arg1); | |
0f2d19dd JB |
4431 | } |
4432 | case scm_tc7_subr_3: | |
ab1f1094 DH |
4433 | if (SCM_NULLP (args) |
4434 | || SCM_NULLP (SCM_CDR (args)) | |
4435 | || !SCM_NULLP (SCM_CDDR (args))) | |
4436 | scm_wrong_num_args (proc); | |
4437 | else | |
4438 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args))); | |
0f2d19dd JB |
4439 | case scm_tc7_lsubr: |
4440 | #ifdef DEVAL | |
ddea3325 | 4441 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args)); |
0f2d19dd | 4442 | #else |
ddea3325 | 4443 | RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args))); |
0f2d19dd JB |
4444 | #endif |
4445 | case scm_tc7_lsubr_2: | |
ab1f1094 DH |
4446 | if (!SCM_CONSP (args)) |
4447 | scm_wrong_num_args (proc); | |
4448 | else | |
4449 | RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args))); | |
0f2d19dd JB |
4450 | case scm_tc7_asubr: |
4451 | if (SCM_NULLP (args)) | |
ddea3325 | 4452 | RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED)); |
0f2d19dd JB |
4453 | while (SCM_NIMP (args)) |
4454 | { | |
4455 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4456 | arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args)); | |
4457 | args = SCM_CDR (args); | |
4458 | } | |
4459 | RETURN (arg1); | |
4460 | case scm_tc7_rpsubr: | |
4461 | if (SCM_NULLP (args)) | |
4462 | RETURN (SCM_BOOL_T); | |
4463 | while (SCM_NIMP (args)) | |
4464 | { | |
4465 | SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply"); | |
4466 | if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args)))) | |
4467 | RETURN (SCM_BOOL_F); | |
4468 | arg1 = SCM_CAR (args); | |
4469 | args = SCM_CDR (args); | |
4470 | } | |
4471 | RETURN (SCM_BOOL_T); | |
4472 | case scm_tcs_closures: | |
4473 | #ifdef DEVAL | |
6dbd0af5 | 4474 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args); |
0f2d19dd JB |
4475 | #else |
4476 | arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4477 | #endif | |
726d810a | 4478 | if (scm_badargsp (SCM_CLOSURE_FORMALS (proc), arg1)) |
ab1f1094 | 4479 | scm_wrong_num_args (proc); |
1609038c MD |
4480 | |
4481 | /* Copy argument list */ | |
4482 | if (SCM_IMP (arg1)) | |
4483 | args = arg1; | |
4484 | else | |
4485 | { | |
4486 | SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED); | |
05b15362 | 4487 | for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1)) |
1609038c | 4488 | { |
05b15362 | 4489 | SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED)); |
1609038c MD |
4490 | tl = SCM_CDR (tl); |
4491 | } | |
4492 | SCM_SETCDR (tl, arg1); | |
4493 | } | |
4494 | ||
821f18a4 DH |
4495 | args = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4496 | args, | |
4497 | SCM_ENV (proc)); | |
f9450cdb | 4498 | proc = SCM_CLOSURE_BODY (proc); |
e791c18f | 4499 | again: |
05b15362 DH |
4500 | arg1 = SCM_CDR (proc); |
4501 | while (!SCM_NULLP (arg1)) | |
2ddb0920 MD |
4502 | { |
4503 | if (SCM_IMP (SCM_CAR (proc))) | |
4504 | { | |
4505 | if (SCM_ISYMP (SCM_CAR (proc))) | |
4506 | { | |
28d52ebb | 4507 | scm_rec_mutex_lock (&source_mutex); |
9bc4701c MD |
4508 | /* check for race condition */ |
4509 | if (SCM_ISYMP (SCM_CAR (proc))) | |
328dc9a3 | 4510 | proc = m_expand_body (proc, args); |
28d52ebb | 4511 | scm_rec_mutex_unlock (&source_mutex); |
e791c18f | 4512 | goto again; |
2ddb0920 | 4513 | } |
5280aaca | 4514 | else |
17fa3fcf | 4515 | SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc)); |
2ddb0920 MD |
4516 | } |
4517 | else | |
e791c18f MD |
4518 | SCM_CEVAL (SCM_CAR (proc), args); |
4519 | proc = arg1; | |
05b15362 | 4520 | arg1 = SCM_CDR (proc); |
2ddb0920 | 4521 | } |
e791c18f | 4522 | RETURN (EVALCAR (proc, args)); |
0717dfd8 | 4523 | case scm_tc7_smob: |
68b06924 | 4524 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
0717dfd8 | 4525 | goto badproc; |
afa38f6e | 4526 | if (SCM_UNBNDP (arg1)) |
ddea3325 | 4527 | RETURN (SCM_SMOB_APPLY_0 (proc)); |
afa38f6e | 4528 | else if (SCM_NULLP (args)) |
ddea3325 | 4529 | RETURN (SCM_SMOB_APPLY_1 (proc, arg1)); |
0717dfd8 | 4530 | else if (SCM_NULLP (SCM_CDR (args))) |
ddea3325 | 4531 | RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args))); |
0717dfd8 | 4532 | else |
68b06924 | 4533 | RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args))); |
0f2d19dd JB |
4534 | case scm_tc7_cclo: |
4535 | #ifdef DEVAL | |
6dbd0af5 MD |
4536 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); |
4537 | arg1 = proc; | |
4538 | proc = SCM_CCLO_SUBR (proc); | |
4539 | debug.vect[0].a.proc = proc; | |
4540 | debug.vect[0].a.args = scm_cons (arg1, args); | |
0f2d19dd JB |
4541 | #else |
4542 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
0f2d19dd JB |
4543 | arg1 = proc; |
4544 | proc = SCM_CCLO_SUBR (proc); | |
6dbd0af5 | 4545 | #endif |
0f2d19dd | 4546 | goto tail; |
89efbff4 MD |
4547 | case scm_tc7_pws: |
4548 | proc = SCM_PROCEDURE (proc); | |
4549 | #ifdef DEVAL | |
4550 | debug.vect[0].a.proc = proc; | |
4551 | #endif | |
4552 | goto tail; | |
904a077d | 4553 | case scm_tcs_struct: |
f3d2630a MD |
4554 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) |
4555 | { | |
4556 | #ifdef DEVAL | |
4557 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4558 | #else | |
4559 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4560 | #endif | |
195847fa | 4561 | RETURN (scm_apply_generic (proc, args)); |
f3d2630a | 4562 | } |
2ca0d207 | 4563 | else if (SCM_I_OPERATORP (proc)) |
da7f71d7 | 4564 | { |
504d99c5 | 4565 | /* operator */ |
da7f71d7 MD |
4566 | #ifdef DEVAL |
4567 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args); | |
4568 | #else | |
4569 | args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args)); | |
4570 | #endif | |
4571 | arg1 = proc; | |
195847fa MD |
4572 | proc = (SCM_I_ENTITYP (proc) |
4573 | ? SCM_ENTITY_PROCEDURE (proc) | |
4574 | : SCM_OPERATOR_PROCEDURE (proc)); | |
da7f71d7 MD |
4575 | #ifdef DEVAL |
4576 | debug.vect[0].a.proc = proc; | |
4577 | debug.vect[0].a.args = scm_cons (arg1, args); | |
4578 | #endif | |
195847fa MD |
4579 | if (SCM_NIMP (proc)) |
4580 | goto tail; | |
4581 | else | |
4582 | goto badproc; | |
da7f71d7 | 4583 | } |
2ca0d207 DH |
4584 | else |
4585 | goto badproc; | |
0f2d19dd JB |
4586 | default: |
4587 | badproc: | |
db4b4ca6 | 4588 | scm_wrong_type_arg ("apply", SCM_ARG1, proc); |
0f2d19dd JB |
4589 | } |
4590 | #ifdef DEVAL | |
6dbd0af5 | 4591 | exit: |
5132eef0 | 4592 | if (scm_check_exit_p && SCM_TRAPS_P) |
b7ff98dd | 4593 | if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug))) |
6dbd0af5 | 4594 | { |
b7ff98dd MD |
4595 | SCM_CLEAR_TRACED_FRAME (debug); |
4596 | if (SCM_CHEAPTRAPS_P) | |
c0ab1b8d | 4597 | arg1 = scm_make_debugobj (&debug); |
6dbd0af5 MD |
4598 | else |
4599 | { | |
5f144b10 GH |
4600 | int first; |
4601 | SCM val = scm_make_continuation (&first); | |
4602 | ||
4603 | if (first) | |
4604 | arg1 = val; | |
4605 | else | |
6dbd0af5 | 4606 | { |
5f144b10 | 4607 | proc = val; |
6dbd0af5 MD |
4608 | goto ret; |
4609 | } | |
4610 | } | |
d95c0b76 NJ |
4611 | SCM_TRAPS_P = 0; |
4612 | scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc); | |
4613 | SCM_TRAPS_P = 1; | |
6dbd0af5 MD |
4614 | } |
4615 | ret: | |
1646d37b | 4616 | scm_last_debug_frame = debug.prev; |
0f2d19dd JB |
4617 | return proc; |
4618 | #endif | |
4619 | } | |
4620 | ||
6dbd0af5 MD |
4621 | |
4622 | /* SECTION: The rest of this file is only read once. | |
4623 | */ | |
4624 | ||
0f2d19dd JB |
4625 | #ifndef DEVAL |
4626 | ||
504d99c5 MD |
4627 | /* Trampolines |
4628 | * | |
4629 | * Trampolines make it possible to move procedure application dispatch | |
4630 | * outside inner loops. The motivation was clean implementation of | |
4631 | * efficient replacements of R5RS primitives in SRFI-1. | |
4632 | * | |
4633 | * The semantics is clear: scm_trampoline_N returns an optimized | |
4634 | * version of scm_call_N (or NULL if the procedure isn't applicable | |
4635 | * on N args). | |
4636 | * | |
4637 | * Applying the optimization to map and for-each increased efficiency | |
4638 | * noticeably. For example, (map abs ls) is now 8 times faster than | |
4639 | * before. | |
4640 | */ | |
4641 | ||
756414cf MD |
4642 | static SCM |
4643 | call_subr0_0 (SCM proc) | |
4644 | { | |
4645 | return SCM_SUBRF (proc) (); | |
4646 | } | |
4647 | ||
4648 | static SCM | |
4649 | call_subr1o_0 (SCM proc) | |
4650 | { | |
4651 | return SCM_SUBRF (proc) (SCM_UNDEFINED); | |
4652 | } | |
4653 | ||
4654 | static SCM | |
4655 | call_lsubr_0 (SCM proc) | |
4656 | { | |
4657 | return SCM_SUBRF (proc) (SCM_EOL); | |
4658 | } | |
4659 | ||
4660 | SCM | |
4661 | scm_i_call_closure_0 (SCM proc) | |
4662 | { | |
6a3f13f0 DH |
4663 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4664 | SCM_EOL, | |
4665 | SCM_ENV (proc)); | |
4666 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4667 | return result; |
756414cf MD |
4668 | } |
4669 | ||
4670 | scm_t_trampoline_0 | |
4671 | scm_trampoline_0 (SCM proc) | |
4672 | { | |
2510c810 DH |
4673 | scm_t_trampoline_0 trampoline; |
4674 | ||
756414cf | 4675 | if (SCM_IMP (proc)) |
d0b07b5d | 4676 | return NULL; |
2510c810 | 4677 | |
756414cf MD |
4678 | switch (SCM_TYP7 (proc)) |
4679 | { | |
4680 | case scm_tc7_subr_0: | |
2510c810 DH |
4681 | trampoline = call_subr0_0; |
4682 | break; | |
756414cf | 4683 | case scm_tc7_subr_1o: |
2510c810 DH |
4684 | trampoline = call_subr1o_0; |
4685 | break; | |
756414cf | 4686 | case scm_tc7_lsubr: |
2510c810 DH |
4687 | trampoline = call_lsubr_0; |
4688 | break; | |
756414cf MD |
4689 | case scm_tcs_closures: |
4690 | { | |
4691 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b | 4692 | if (SCM_NULLP (formals) || !SCM_CONSP (formals)) |
2510c810 | 4693 | trampoline = scm_i_call_closure_0; |
756414cf | 4694 | else |
d0b07b5d | 4695 | return NULL; |
2510c810 | 4696 | break; |
756414cf MD |
4697 | } |
4698 | case scm_tcs_struct: | |
4699 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4700 | trampoline = scm_call_generic_0; |
2ca0d207 | 4701 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4702 | trampoline = scm_call_0; |
4703 | else | |
4704 | return NULL; | |
4705 | break; | |
756414cf MD |
4706 | case scm_tc7_smob: |
4707 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4708 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0; |
756414cf | 4709 | else |
d0b07b5d | 4710 | return NULL; |
2510c810 | 4711 | break; |
756414cf MD |
4712 | case scm_tc7_asubr: |
4713 | case scm_tc7_rpsubr: | |
4714 | case scm_tc7_cclo: | |
4715 | case scm_tc7_pws: | |
2510c810 DH |
4716 | trampoline = scm_call_0; |
4717 | break; | |
756414cf | 4718 | default: |
2510c810 | 4719 | return NULL; /* not applicable on zero arguments */ |
756414cf | 4720 | } |
2510c810 DH |
4721 | /* We only reach this point if a valid trampoline was determined. */ |
4722 | ||
4723 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4724 | * Thus, we replace the trampoline shortcut with scm_call_0. */ | |
4725 | if (SCM_DEBUGGINGP) | |
4726 | return scm_call_0; | |
4727 | else | |
4728 | return trampoline; | |
756414cf MD |
4729 | } |
4730 | ||
504d99c5 MD |
4731 | static SCM |
4732 | call_subr1_1 (SCM proc, SCM arg1) | |
4733 | { | |
4734 | return SCM_SUBRF (proc) (arg1); | |
4735 | } | |
4736 | ||
9ed24633 MD |
4737 | static SCM |
4738 | call_subr2o_1 (SCM proc, SCM arg1) | |
4739 | { | |
4740 | return SCM_SUBRF (proc) (arg1, SCM_UNDEFINED); | |
4741 | } | |
4742 | ||
504d99c5 MD |
4743 | static SCM |
4744 | call_lsubr_1 (SCM proc, SCM arg1) | |
4745 | { | |
4746 | return SCM_SUBRF (proc) (scm_list_1 (arg1)); | |
4747 | } | |
4748 | ||
4749 | static SCM | |
4750 | call_dsubr_1 (SCM proc, SCM arg1) | |
4751 | { | |
4752 | if (SCM_INUMP (arg1)) | |
4753 | { | |
4754 | RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)))); | |
4755 | } | |
4756 | else if (SCM_REALP (arg1)) | |
4757 | { | |
4758 | RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1)))); | |
4759 | } | |
504d99c5 MD |
4760 | else if (SCM_BIGP (arg1)) |
4761 | RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1)))); | |
504d99c5 MD |
4762 | SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1, |
4763 | SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4764 | } | |
4765 | ||
4766 | static SCM | |
4767 | call_cxr_1 (SCM proc, SCM arg1) | |
4768 | { | |
14b18ed6 DH |
4769 | unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc); |
4770 | do | |
4771 | { | |
4772 | SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1, | |
4773 | SCM_SYMBOL_CHARS (SCM_SNAME (proc))); | |
4774 | arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1); | |
4775 | pattern >>= 2; | |
4776 | } while (pattern); | |
4777 | return arg1; | |
504d99c5 MD |
4778 | } |
4779 | ||
4780 | static SCM | |
4781 | call_closure_1 (SCM proc, SCM arg1) | |
4782 | { | |
6a3f13f0 DH |
4783 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4784 | scm_list_1 (arg1), | |
4785 | SCM_ENV (proc)); | |
4786 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4787 | return result; |
504d99c5 MD |
4788 | } |
4789 | ||
4790 | scm_t_trampoline_1 | |
4791 | scm_trampoline_1 (SCM proc) | |
4792 | { | |
2510c810 DH |
4793 | scm_t_trampoline_1 trampoline; |
4794 | ||
504d99c5 | 4795 | if (SCM_IMP (proc)) |
d0b07b5d | 4796 | return NULL; |
2510c810 | 4797 | |
504d99c5 MD |
4798 | switch (SCM_TYP7 (proc)) |
4799 | { | |
4800 | case scm_tc7_subr_1: | |
4801 | case scm_tc7_subr_1o: | |
2510c810 DH |
4802 | trampoline = call_subr1_1; |
4803 | break; | |
9ed24633 | 4804 | case scm_tc7_subr_2o: |
2510c810 DH |
4805 | trampoline = call_subr2o_1; |
4806 | break; | |
504d99c5 | 4807 | case scm_tc7_lsubr: |
2510c810 DH |
4808 | trampoline = call_lsubr_1; |
4809 | break; | |
14b18ed6 | 4810 | case scm_tc7_dsubr: |
2510c810 DH |
4811 | trampoline = call_dsubr_1; |
4812 | break; | |
504d99c5 | 4813 | case scm_tc7_cxr: |
2510c810 DH |
4814 | trampoline = call_cxr_1; |
4815 | break; | |
504d99c5 MD |
4816 | case scm_tcs_closures: |
4817 | { | |
4818 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4819 | if (!SCM_NULLP (formals) |
4820 | && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals)))) | |
2510c810 | 4821 | trampoline = call_closure_1; |
504d99c5 | 4822 | else |
d0b07b5d | 4823 | return NULL; |
2510c810 | 4824 | break; |
504d99c5 MD |
4825 | } |
4826 | case scm_tcs_struct: | |
4827 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4828 | trampoline = scm_call_generic_1; |
2ca0d207 | 4829 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4830 | trampoline = scm_call_1; |
4831 | else | |
4832 | return NULL; | |
4833 | break; | |
504d99c5 MD |
4834 | case scm_tc7_smob: |
4835 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4836 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1; |
504d99c5 | 4837 | else |
d0b07b5d | 4838 | return NULL; |
2510c810 | 4839 | break; |
504d99c5 MD |
4840 | case scm_tc7_asubr: |
4841 | case scm_tc7_rpsubr: | |
4842 | case scm_tc7_cclo: | |
4843 | case scm_tc7_pws: | |
2510c810 DH |
4844 | trampoline = scm_call_1; |
4845 | break; | |
504d99c5 | 4846 | default: |
d0b07b5d | 4847 | return NULL; /* not applicable on one arg */ |
504d99c5 | 4848 | } |
2510c810 DH |
4849 | /* We only reach this point if a valid trampoline was determined. */ |
4850 | ||
4851 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4852 | * Thus, we replace the trampoline shortcut with scm_call_1. */ | |
4853 | if (SCM_DEBUGGINGP) | |
4854 | return scm_call_1; | |
4855 | else | |
4856 | return trampoline; | |
504d99c5 MD |
4857 | } |
4858 | ||
4859 | static SCM | |
4860 | call_subr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4861 | { | |
4862 | return SCM_SUBRF (proc) (arg1, arg2); | |
4863 | } | |
4864 | ||
9ed24633 MD |
4865 | static SCM |
4866 | call_lsubr2_2 (SCM proc, SCM arg1, SCM arg2) | |
4867 | { | |
4868 | return SCM_SUBRF (proc) (arg1, arg2, SCM_EOL); | |
4869 | } | |
4870 | ||
504d99c5 MD |
4871 | static SCM |
4872 | call_lsubr_2 (SCM proc, SCM arg1, SCM arg2) | |
4873 | { | |
4874 | return SCM_SUBRF (proc) (scm_list_2 (arg1, arg2)); | |
4875 | } | |
4876 | ||
4877 | static SCM | |
4878 | call_closure_2 (SCM proc, SCM arg1, SCM arg2) | |
4879 | { | |
6a3f13f0 DH |
4880 | const SCM env = SCM_EXTEND_ENV (SCM_CLOSURE_FORMALS (proc), |
4881 | scm_list_2 (arg1, arg2), | |
4882 | SCM_ENV (proc)); | |
4883 | const SCM result = scm_eval_body (SCM_CLOSURE_BODY (proc), env); | |
d0b07b5d | 4884 | return result; |
504d99c5 MD |
4885 | } |
4886 | ||
4887 | scm_t_trampoline_2 | |
4888 | scm_trampoline_2 (SCM proc) | |
4889 | { | |
2510c810 DH |
4890 | scm_t_trampoline_2 trampoline; |
4891 | ||
504d99c5 | 4892 | if (SCM_IMP (proc)) |
d0b07b5d | 4893 | return NULL; |
2510c810 | 4894 | |
504d99c5 MD |
4895 | switch (SCM_TYP7 (proc)) |
4896 | { | |
4897 | case scm_tc7_subr_2: | |
4898 | case scm_tc7_subr_2o: | |
4899 | case scm_tc7_rpsubr: | |
4900 | case scm_tc7_asubr: | |
2510c810 DH |
4901 | trampoline = call_subr2_2; |
4902 | break; | |
9ed24633 | 4903 | case scm_tc7_lsubr_2: |
2510c810 DH |
4904 | trampoline = call_lsubr2_2; |
4905 | break; | |
504d99c5 | 4906 | case scm_tc7_lsubr: |
2510c810 DH |
4907 | trampoline = call_lsubr_2; |
4908 | break; | |
504d99c5 MD |
4909 | case scm_tcs_closures: |
4910 | { | |
4911 | SCM formals = SCM_CLOSURE_FORMALS (proc); | |
4b612c5b MD |
4912 | if (!SCM_NULLP (formals) |
4913 | && (!SCM_CONSP (formals) | |
4914 | || (!SCM_NULLP (SCM_CDR (formals)) | |
4915 | && (!SCM_CONSP (SCM_CDR (formals)) | |
4916 | || !SCM_CONSP (SCM_CDDR (formals)))))) | |
2510c810 | 4917 | trampoline = call_closure_2; |
504d99c5 | 4918 | else |
d0b07b5d | 4919 | return NULL; |
2510c810 | 4920 | break; |
504d99c5 MD |
4921 | } |
4922 | case scm_tcs_struct: | |
4923 | if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC) | |
2510c810 | 4924 | trampoline = scm_call_generic_2; |
2ca0d207 | 4925 | else if (SCM_I_OPERATORP (proc)) |
2510c810 DH |
4926 | trampoline = scm_call_2; |
4927 | else | |
4928 | return NULL; | |
4929 | break; | |
504d99c5 MD |
4930 | case scm_tc7_smob: |
4931 | if (SCM_SMOB_APPLICABLE_P (proc)) | |
2510c810 | 4932 | trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2; |
504d99c5 | 4933 | else |
d0b07b5d | 4934 | return NULL; |
2510c810 | 4935 | break; |
504d99c5 MD |
4936 | case scm_tc7_cclo: |
4937 | case scm_tc7_pws: | |
2510c810 DH |
4938 | trampoline = scm_call_2; |
4939 | break; | |
504d99c5 | 4940 | default: |
d0b07b5d | 4941 | return NULL; /* not applicable on two args */ |
504d99c5 | 4942 | } |
2510c810 DH |
4943 | /* We only reach this point if a valid trampoline was determined. */ |
4944 | ||
4945 | /* If debugging is enabled, we want to see all calls to proc on the stack. | |
4946 | * Thus, we replace the trampoline shortcut with scm_call_2. */ | |
4947 | if (SCM_DEBUGGINGP) | |
4948 | return scm_call_2; | |
4949 | else | |
4950 | return trampoline; | |
504d99c5 MD |
4951 | } |
4952 | ||
d9c393f5 JB |
4953 | /* Typechecking for multi-argument MAP and FOR-EACH. |
4954 | ||
47c3f06d | 4955 | Verify that each element of the vector ARGV, except for the first, |
d9c393f5 | 4956 | is a proper list whose length is LEN. Attribute errors to WHO, |
47c3f06d | 4957 | and claim that the i'th element of ARGV is WHO's i+2'th argument. */ |
d9c393f5 | 4958 | static inline void |
47c3f06d | 4959 | check_map_args (SCM argv, |
c014a02e | 4960 | long len, |
47c3f06d MD |
4961 | SCM gf, |
4962 | SCM proc, | |
4963 | SCM args, | |
4964 | const char *who) | |
d9c393f5 | 4965 | { |
34d19ef6 | 4966 | SCM const *ve = SCM_VELTS (argv); |
c014a02e | 4967 | long i; |
d9c393f5 | 4968 | |
b5c2579a | 4969 | for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--) |
d9c393f5 | 4970 | { |
c014a02e | 4971 | long elt_len = scm_ilength (ve[i]); |
d9c393f5 JB |
4972 | |
4973 | if (elt_len < 0) | |
47c3f06d MD |
4974 | { |
4975 | if (gf) | |
4976 | scm_apply_generic (gf, scm_cons (proc, args)); | |
4977 | else | |
4978 | scm_wrong_type_arg (who, i + 2, ve[i]); | |
4979 | } | |
d9c393f5 JB |
4980 | |
4981 | if (elt_len != len) | |
504d99c5 | 4982 | scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2)); |
d9c393f5 JB |
4983 | } |
4984 | ||
5d2b97cd | 4985 | scm_remember_upto_here_1 (argv); |
d9c393f5 JB |
4986 | } |
4987 | ||
4988 | ||
47c3f06d | 4989 | SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map); |
1cc91f1b | 4990 | |
368bf056 MD |
4991 | /* Note: Currently, scm_map applies PROC to the argument list(s) |
4992 | sequentially, starting with the first element(s). This is used in | |
8878f040 | 4993 | evalext.c where the Scheme procedure `map-in-order', which guarantees |
368bf056 | 4994 | sequential behaviour, is implemented using scm_map. If the |
8878f040 | 4995 | behaviour changes, we need to update `map-in-order'. |
368bf056 MD |
4996 | */ |
4997 | ||
0f2d19dd | 4998 | SCM |
1bbd0b84 | 4999 | scm_map (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5000 | #define FUNC_NAME s_map |
0f2d19dd | 5001 | { |
c014a02e | 5002 | long i, len; |
0f2d19dd JB |
5003 | SCM res = SCM_EOL; |
5004 | SCM *pres = &res; | |
34d19ef6 | 5005 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
0f2d19dd | 5006 | |
d9c393f5 | 5007 | len = scm_ilength (arg1); |
47c3f06d MD |
5008 | SCM_GASSERTn (len >= 0, |
5009 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map); | |
af45e3b0 | 5010 | SCM_VALIDATE_REST_ARGUMENT (args); |
0f2d19dd JB |
5011 | if (SCM_NULLP (args)) |
5012 | { | |
504d99c5 MD |
5013 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5014 | SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map); | |
5015 | while (SCM_NIMP (arg1)) | |
5016 | { | |
5017 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1))); | |
5018 | pres = SCM_CDRLOC (*pres); | |
5019 | arg1 = SCM_CDR (arg1); | |
5020 | } | |
5021 | return res; | |
5022 | } | |
5023 | if (SCM_NULLP (SCM_CDR (args))) | |
5024 | { | |
5025 | SCM arg2 = SCM_CAR (args); | |
5026 | int len2 = scm_ilength (arg2); | |
5027 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5028 | SCM_GASSERTn (call, | |
5029 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG1, s_map); | |
5030 | SCM_GASSERTn (len2 >= 0, | |
5031 | g_map, scm_cons2 (proc, arg1, args), SCM_ARG3, s_map); | |
5032 | if (len2 != len) | |
5033 | SCM_OUT_OF_RANGE (3, arg2); | |
0f2d19dd JB |
5034 | while (SCM_NIMP (arg1)) |
5035 | { | |
504d99c5 | 5036 | *pres = scm_list_1 (call (proc, SCM_CAR (arg1), SCM_CAR (arg2))); |
a23afe53 | 5037 | pres = SCM_CDRLOC (*pres); |
0f2d19dd | 5038 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5039 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5040 | } |
5041 | return res; | |
5042 | } | |
05b15362 DH |
5043 | arg1 = scm_cons (arg1, args); |
5044 | args = scm_vector (arg1); | |
0f2d19dd | 5045 | ve = SCM_VELTS (args); |
47c3f06d | 5046 | check_map_args (args, len, g_map, proc, arg1, s_map); |
0f2d19dd JB |
5047 | while (1) |
5048 | { | |
5049 | arg1 = SCM_EOL; | |
b5c2579a | 5050 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5051 | { |
d9c393f5 JB |
5052 | if (SCM_IMP (ve[i])) |
5053 | return res; | |
0f2d19dd | 5054 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5055 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd | 5056 | } |
8ea46249 | 5057 | *pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL)); |
a23afe53 | 5058 | pres = SCM_CDRLOC (*pres); |
0f2d19dd JB |
5059 | } |
5060 | } | |
af45e3b0 | 5061 | #undef FUNC_NAME |
0f2d19dd JB |
5062 | |
5063 | ||
47c3f06d | 5064 | SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each); |
1cc91f1b | 5065 | |
0f2d19dd | 5066 | SCM |
1bbd0b84 | 5067 | scm_for_each (SCM proc, SCM arg1, SCM args) |
af45e3b0 | 5068 | #define FUNC_NAME s_for_each |
0f2d19dd | 5069 | { |
34d19ef6 | 5070 | SCM const *ve = &args; /* Keep args from being optimized away. */ |
c014a02e | 5071 | long i, len; |
d9c393f5 | 5072 | len = scm_ilength (arg1); |
47c3f06d MD |
5073 | SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args), |
5074 | SCM_ARG2, s_for_each); | |
af45e3b0 | 5075 | SCM_VALIDATE_REST_ARGUMENT (args); |
c96d76b8 | 5076 | if (SCM_NULLP (args)) |
0f2d19dd | 5077 | { |
504d99c5 MD |
5078 | scm_t_trampoline_1 call = scm_trampoline_1 (proc); |
5079 | SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each); | |
5080 | while (SCM_NIMP (arg1)) | |
5081 | { | |
5082 | call (proc, SCM_CAR (arg1)); | |
5083 | arg1 = SCM_CDR (arg1); | |
5084 | } | |
5085 | return SCM_UNSPECIFIED; | |
5086 | } | |
5087 | if (SCM_NULLP (SCM_CDR (args))) | |
5088 | { | |
5089 | SCM arg2 = SCM_CAR (args); | |
5090 | int len2 = scm_ilength (arg2); | |
5091 | scm_t_trampoline_2 call = scm_trampoline_2 (proc); | |
5092 | SCM_GASSERTn (call, g_for_each, | |
5093 | scm_cons2 (proc, arg1, args), SCM_ARG1, s_for_each); | |
5094 | SCM_GASSERTn (len2 >= 0, g_for_each, | |
5095 | scm_cons2 (proc, arg1, args), SCM_ARG3, s_for_each); | |
5096 | if (len2 != len) | |
5097 | SCM_OUT_OF_RANGE (3, arg2); | |
c96d76b8 | 5098 | while (SCM_NIMP (arg1)) |
0f2d19dd | 5099 | { |
504d99c5 | 5100 | call (proc, SCM_CAR (arg1), SCM_CAR (arg2)); |
0f2d19dd | 5101 | arg1 = SCM_CDR (arg1); |
504d99c5 | 5102 | arg2 = SCM_CDR (arg2); |
0f2d19dd JB |
5103 | } |
5104 | return SCM_UNSPECIFIED; | |
5105 | } | |
05b15362 DH |
5106 | arg1 = scm_cons (arg1, args); |
5107 | args = scm_vector (arg1); | |
0f2d19dd | 5108 | ve = SCM_VELTS (args); |
47c3f06d | 5109 | check_map_args (args, len, g_for_each, proc, arg1, s_for_each); |
0f2d19dd JB |
5110 | while (1) |
5111 | { | |
5112 | arg1 = SCM_EOL; | |
b5c2579a | 5113 | for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--) |
0f2d19dd | 5114 | { |
c96d76b8 NJ |
5115 | if (SCM_IMP (ve[i])) |
5116 | return SCM_UNSPECIFIED; | |
0f2d19dd | 5117 | arg1 = scm_cons (SCM_CAR (ve[i]), arg1); |
34d19ef6 | 5118 | SCM_VECTOR_SET (args, i, SCM_CDR (ve[i])); |
0f2d19dd JB |
5119 | } |
5120 | scm_apply (proc, arg1, SCM_EOL); | |
5121 | } | |
5122 | } | |
af45e3b0 | 5123 | #undef FUNC_NAME |
0f2d19dd | 5124 | |
1cc91f1b | 5125 | |
0f2d19dd | 5126 | SCM |
6e8d25a6 | 5127 | scm_closure (SCM code, SCM env) |
0f2d19dd | 5128 | { |
16d4699b MV |
5129 | SCM z; |
5130 | SCM closcar = scm_cons (code, SCM_EOL); | |
228a24ef | 5131 | z = scm_cell (SCM_UNPACK (closcar) + scm_tc3_closure, (scm_t_bits) env); |
16d4699b | 5132 | scm_remember_upto_here (closcar); |
0f2d19dd JB |
5133 | return z; |
5134 | } | |
5135 | ||
5136 | ||
92c2555f | 5137 | scm_t_bits scm_tc16_promise; |
1cc91f1b | 5138 | |
0f2d19dd | 5139 | SCM |
6e8d25a6 | 5140 | scm_makprom (SCM code) |
0f2d19dd | 5141 | { |
28d52ebb MD |
5142 | SCM_RETURN_NEWSMOB2 (scm_tc16_promise, |
5143 | SCM_UNPACK (code), | |
5144 | scm_make_rec_mutex ()); | |
0f2d19dd JB |
5145 | } |
5146 | ||
28d52ebb MD |
5147 | static size_t |
5148 | promise_free (SCM promise) | |
5149 | { | |
5150 | scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise)); | |
5151 | return 0; | |
5152 | } | |
1cc91f1b | 5153 | |
0f2d19dd | 5154 | static int |
e841c3e0 | 5155 | promise_print (SCM exp, SCM port, scm_print_state *pstate) |
0f2d19dd | 5156 | { |
19402679 | 5157 | int writingp = SCM_WRITINGP (pstate); |
b7f3516f | 5158 | scm_puts ("#<promise ", port); |
19402679 | 5159 | SCM_SET_WRITINGP (pstate, 1); |
28d52ebb | 5160 | scm_iprin1 (SCM_PROMISE_DATA (exp), port, pstate); |
19402679 | 5161 | SCM_SET_WRITINGP (pstate, writingp); |
b7f3516f | 5162 | scm_putc ('>', port); |
0f2d19dd JB |
5163 | return !0; |
5164 | } | |
5165 | ||
3b3b36dd | 5166 | SCM_DEFINE (scm_force, "force", 1, 0, 0, |
28d52ebb | 5167 | (SCM promise), |
67e8151b MG |
5168 | "If the promise @var{x} has not been computed yet, compute and\n" |
5169 | "return @var{x}, otherwise just return the previously computed\n" | |
5170 | "value.") | |
1bbd0b84 | 5171 | #define FUNC_NAME s_scm_force |
0f2d19dd | 5172 | { |
28d52ebb MD |
5173 | SCM_VALIDATE_SMOB (1, promise, promise); |
5174 | scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise)); | |
5175 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5176 | { |
28d52ebb MD |
5177 | SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise)); |
5178 | if (!SCM_PROMISE_COMPUTED_P (promise)) | |
0f2d19dd | 5179 | { |
28d52ebb MD |
5180 | SCM_SET_PROMISE_DATA (promise, ans); |
5181 | SCM_SET_PROMISE_COMPUTED (promise); | |
0f2d19dd JB |
5182 | } |
5183 | } | |
28d52ebb MD |
5184 | scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise)); |
5185 | return SCM_PROMISE_DATA (promise); | |
0f2d19dd | 5186 | } |
1bbd0b84 | 5187 | #undef FUNC_NAME |
0f2d19dd | 5188 | |
445f675c | 5189 | |
a1ec6916 | 5190 | SCM_DEFINE (scm_promise_p, "promise?", 1, 0, 0, |
67e8151b | 5191 | (SCM obj), |
b380b885 | 5192 | "Return true if @var{obj} is a promise, i.e. a delayed computation\n" |
7a095584 | 5193 | "(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).") |
1bbd0b84 | 5194 | #define FUNC_NAME s_scm_promise_p |
0f2d19dd | 5195 | { |
67e8151b | 5196 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj)); |
0f2d19dd | 5197 | } |
1bbd0b84 | 5198 | #undef FUNC_NAME |
0f2d19dd | 5199 | |
445f675c | 5200 | |
a1ec6916 | 5201 | SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, |
1bbd0b84 | 5202 | (SCM xorig, SCM x, SCM y), |
11768c04 NJ |
5203 | "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" |
5204 | "Any source properties associated with @var{xorig} are also associated\n" | |
5205 | "with the new pair.") | |
1bbd0b84 | 5206 | #define FUNC_NAME s_scm_cons_source |
26d5b9b4 MD |
5207 | { |
5208 | SCM p, z; | |
16d4699b | 5209 | z = scm_cons (x, y); |
26d5b9b4 MD |
5210 | /* Copy source properties possibly associated with xorig. */ |
5211 | p = scm_whash_lookup (scm_source_whash, xorig); | |
445f675c | 5212 | if (!SCM_IMP (p)) |
26d5b9b4 MD |
5213 | scm_whash_insert (scm_source_whash, z, p); |
5214 | return z; | |
5215 | } | |
1bbd0b84 | 5216 | #undef FUNC_NAME |
26d5b9b4 | 5217 | |
445f675c | 5218 | |
a1ec6916 | 5219 | SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0, |
1bbd0b84 | 5220 | (SCM obj), |
b380b885 MD |
5221 | "Recursively copy the data tree that is bound to @var{obj}, and return a\n" |
5222 | "pointer to the new data structure. @code{copy-tree} recurses down the\n" | |
5223 | "contents of both pairs and vectors (since both cons cells and vector\n" | |
5224 | "cells may point to arbitrary objects), and stops recursing when it hits\n" | |
5225 | "any other object.") | |
1bbd0b84 | 5226 | #define FUNC_NAME s_scm_copy_tree |
0f2d19dd JB |
5227 | { |
5228 | SCM ans, tl; | |
26d5b9b4 | 5229 | if (SCM_IMP (obj)) |
ff467021 | 5230 | return obj; |
3910272e MD |
5231 | if (SCM_VECTORP (obj)) |
5232 | { | |
c014a02e | 5233 | unsigned long i = SCM_VECTOR_LENGTH (obj); |
00ffa0e7 | 5234 | ans = scm_c_make_vector (i, SCM_UNSPECIFIED); |
3910272e | 5235 | while (i--) |
34d19ef6 | 5236 | SCM_VECTOR_SET (ans, i, scm_copy_tree (SCM_VELTS (obj)[i])); |
3910272e MD |
5237 | return ans; |
5238 | } | |
01f11e02 | 5239 | if (!SCM_CONSP (obj)) |
0f2d19dd | 5240 | return obj; |
26d5b9b4 MD |
5241 | ans = tl = scm_cons_source (obj, |
5242 | scm_copy_tree (SCM_CAR (obj)), | |
5243 | SCM_UNSPECIFIED); | |
05b15362 | 5244 | for (obj = SCM_CDR (obj); SCM_CONSP (obj); obj = SCM_CDR (obj)) |
a23afe53 MD |
5245 | { |
5246 | SCM_SETCDR (tl, scm_cons (scm_copy_tree (SCM_CAR (obj)), | |
5247 | SCM_UNSPECIFIED)); | |
5248 | tl = SCM_CDR (tl); | |
5249 | } | |
5250 | SCM_SETCDR (tl, obj); | |
0f2d19dd JB |
5251 | return ans; |
5252 | } | |
1bbd0b84 | 5253 | #undef FUNC_NAME |
0f2d19dd | 5254 | |
1cc91f1b | 5255 | |
4163eb72 MV |
5256 | /* We have three levels of EVAL here: |
5257 | ||
5258 | - scm_i_eval (exp, env) | |
5259 | ||
5260 | evaluates EXP in environment ENV. ENV is a lexical environment | |
5261 | structure as used by the actual tree code evaluator. When ENV is | |
5262 | a top-level environment, then changes to the current module are | |
a513ead3 | 5263 | tracked by updating ENV so that it continues to be in sync with |
4163eb72 MV |
5264 | the current module. |
5265 | ||
5266 | - scm_primitive_eval (exp) | |
5267 | ||
5268 | evaluates EXP in the top-level environment as determined by the | |
5269 | current module. This is done by constructing a suitable | |
5270 | environment and calling scm_i_eval. Thus, changes to the | |
5271 | top-level module are tracked normally. | |
5272 | ||
5273 | - scm_eval (exp, mod) | |
5274 | ||
a513ead3 | 5275 | evaluates EXP while MOD is the current module. This is done by |
4163eb72 MV |
5276 | setting the current module to MOD, invoking scm_primitive_eval on |
5277 | EXP, and then restoring the current module to the value it had | |
5278 | previously. That is, while EXP is evaluated, changes to the | |
5279 | current module are tracked, but these changes do not persist when | |
5280 | scm_eval returns. | |
5281 | ||
5282 | For each level of evals, there are two variants, distinguished by a | |
5283 | _x suffix: the ordinary variant does not modify EXP while the _x | |
5284 | variant can destructively modify EXP into something completely | |
5285 | unintelligible. A Scheme data structure passed as EXP to one of the | |
5286 | _x variants should not ever be used again for anything. So when in | |
5287 | doubt, use the ordinary variant. | |
5288 | ||
5289 | */ | |
5290 | ||
0f2d19dd | 5291 | SCM |
68d8be66 | 5292 | scm_i_eval_x (SCM exp, SCM env) |
0f2d19dd | 5293 | { |
68d8be66 | 5294 | return SCM_XEVAL (exp, env); |
0f2d19dd JB |
5295 | } |
5296 | ||
68d8be66 MD |
5297 | SCM |
5298 | scm_i_eval (SCM exp, SCM env) | |
5299 | { | |
26fb6390 | 5300 | exp = scm_copy_tree (exp); |
e37a4fba | 5301 | return SCM_XEVAL (exp, env); |
68d8be66 MD |
5302 | } |
5303 | ||
5304 | SCM | |
4163eb72 | 5305 | scm_primitive_eval_x (SCM exp) |
0f2d19dd | 5306 | { |
a513ead3 | 5307 | SCM env; |
bcdab802 | 5308 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5309 | if (SCM_NIMP (transformer)) |
fdc28395 | 5310 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5311 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 | 5312 | return scm_i_eval_x (exp, env); |
0f2d19dd JB |
5313 | } |
5314 | ||
4163eb72 MV |
5315 | SCM_DEFINE (scm_primitive_eval, "primitive-eval", 1, 0, 0, |
5316 | (SCM exp), | |
2069af38 | 5317 | "Evaluate @var{exp} in the top-level environment specified by\n" |
4163eb72 MV |
5318 | "the current module.") |
5319 | #define FUNC_NAME s_scm_primitive_eval | |
5320 | { | |
a513ead3 | 5321 | SCM env; |
bcdab802 | 5322 | SCM transformer = scm_current_module_transformer (); |
a513ead3 | 5323 | if (SCM_NIMP (transformer)) |
fdc28395 | 5324 | exp = scm_call_1 (transformer, exp); |
a513ead3 | 5325 | env = scm_top_level_env (scm_current_module_lookup_closure ()); |
4163eb72 MV |
5326 | return scm_i_eval (exp, env); |
5327 | } | |
5328 | #undef FUNC_NAME | |
5329 | ||
68d8be66 MD |
5330 | /* Eval does not take the second arg optionally. This is intentional |
5331 | * in order to be R5RS compatible, and to prepare for the new module | |
5332 | * system, where we would like to make the choice of evaluation | |
4163eb72 | 5333 | * environment explicit. */ |
549e6ec6 | 5334 | |
09074dbf DH |
5335 | static void |
5336 | change_environment (void *data) | |
5337 | { | |
5338 | SCM pair = SCM_PACK (data); | |
5339 | SCM new_module = SCM_CAR (pair); | |
aa767bc5 | 5340 | SCM old_module = scm_current_module (); |
09074dbf | 5341 | SCM_SETCDR (pair, old_module); |
aa767bc5 | 5342 | scm_set_current_module (new_module); |
09074dbf DH |
5343 | } |
5344 | ||
5345 | ||
09074dbf DH |
5346 | static void |
5347 | restore_environment (void *data) | |
5348 | { | |
5349 | SCM pair = SCM_PACK (data); | |
5350 | SCM old_module = SCM_CDR (pair); | |
aa767bc5 | 5351 | SCM new_module = scm_current_module (); |
2e9c835d | 5352 | SCM_SETCAR (pair, new_module); |
aa767bc5 | 5353 | scm_set_current_module (old_module); |
09074dbf DH |
5354 | } |
5355 | ||
4163eb72 MV |
5356 | static SCM |
5357 | inner_eval_x (void *data) | |
5358 | { | |
5359 | return scm_primitive_eval_x (SCM_PACK(data)); | |
5360 | } | |
5361 | ||
5362 | SCM | |
5363 | scm_eval_x (SCM exp, SCM module) | |
5364 | #define FUNC_NAME "eval!" | |
5365 | { | |
5366 | SCM_VALIDATE_MODULE (2, module); | |
5367 | ||
5368 | return scm_internal_dynamic_wind | |
5369 | (change_environment, inner_eval_x, restore_environment, | |
5370 | (void *) SCM_UNPACK (exp), | |
5371 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
5372 | } | |
5373 | #undef FUNC_NAME | |
5374 | ||
5375 | static SCM | |
5376 | inner_eval (void *data) | |
5377 | { | |
5378 | return scm_primitive_eval (SCM_PACK(data)); | |
5379 | } | |
09074dbf | 5380 | |
68d8be66 | 5381 | SCM_DEFINE (scm_eval, "eval", 2, 0, 0, |
4163eb72 MV |
5382 | (SCM exp, SCM module), |
5383 | "Evaluate @var{exp}, a list representing a Scheme expression,\n" | |
5384 | "in the top-level environment specified by @var{module}.\n" | |
8f85c0c6 | 5385 | "While @var{exp} is evaluated (using @code{primitive-eval}),\n" |
4163eb72 MV |
5386 | "@var{module} is made the current module. The current module\n" |
5387 | "is reset to its previous value when @var{eval} returns.") | |
1bbd0b84 | 5388 | #define FUNC_NAME s_scm_eval |
0f2d19dd | 5389 | { |
4163eb72 | 5390 | SCM_VALIDATE_MODULE (2, module); |
09074dbf DH |
5391 | |
5392 | return scm_internal_dynamic_wind | |
5393 | (change_environment, inner_eval, restore_environment, | |
4163eb72 MV |
5394 | (void *) SCM_UNPACK (exp), |
5395 | (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F))); | |
0f2d19dd | 5396 | } |
1bbd0b84 | 5397 | #undef FUNC_NAME |
0f2d19dd | 5398 | |
6dbd0af5 MD |
5399 | |
5400 | /* At this point, scm_deval and scm_dapply are generated. | |
5401 | */ | |
5402 | ||
a44a9715 DH |
5403 | #define DEVAL |
5404 | #include "eval.c" | |
0f2d19dd | 5405 | |
1cc91f1b | 5406 | |
0f2d19dd JB |
5407 | void |
5408 | scm_init_eval () | |
0f2d19dd | 5409 | { |
33b97402 MD |
5410 | scm_init_opts (scm_evaluator_traps, |
5411 | scm_evaluator_trap_table, | |
5412 | SCM_N_EVALUATOR_TRAPS); | |
5413 | scm_init_opts (scm_eval_options_interface, | |
5414 | scm_eval_opts, | |
5415 | SCM_N_EVAL_OPTIONS); | |
5416 | ||
f99c9c28 MD |
5417 | scm_tc16_promise = scm_make_smob_type ("promise", 0); |
5418 | scm_set_smob_mark (scm_tc16_promise, scm_markcdr); | |
28d52ebb | 5419 | scm_set_smob_free (scm_tc16_promise, promise_free); |
e841c3e0 | 5420 | scm_set_smob_print (scm_tc16_promise, promise_print); |
b8229a3b | 5421 | |
a44a9715 DH |
5422 | undefineds = scm_list_1 (SCM_UNDEFINED); |
5423 | SCM_SETCDR (undefineds, undefineds); | |
5424 | scm_permanent_object (undefineds); | |
7c33806a | 5425 | |
a44a9715 | 5426 | scm_listofnull = scm_list_1 (SCM_EOL); |
0f2d19dd | 5427 | |
a44a9715 DH |
5428 | f_apply = scm_c_define_subr ("apply", scm_tc7_lsubr_2, scm_apply); |
5429 | scm_permanent_object (f_apply); | |
86d31dfe | 5430 | |
a0599745 | 5431 | #include "libguile/eval.x" |
60a49842 | 5432 | |
25eaf21a | 5433 | scm_add_feature ("delay"); |
0f2d19dd | 5434 | } |
0f2d19dd | 5435 | |
6dbd0af5 | 5436 | #endif /* !DEVAL */ |
89e00824 ML |
5437 | |
5438 | /* | |
5439 | Local Variables: | |
5440 | c-file-style: "gnu" | |
5441 | End: | |
5442 | */ |