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ed3ef339 DE |
1 | /* GDB/Scheme support for math operations on values. |
2 | ||
3 | Copyright (C) 2008-2014 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | /* See README file in this directory for implementation notes, coding | |
21 | conventions, et.al. */ | |
22 | ||
23 | #include "defs.h" | |
24 | #include "arch-utils.h" | |
25 | #include "charset.h" | |
26 | #include "cp-abi.h" | |
27 | #include "doublest.h" /* Needed by dfp.h. */ | |
28 | #include "expression.h" /* Needed by dfp.h. */ | |
29 | #include "dfp.h" | |
30 | #include "gdb_assert.h" | |
31 | #include "symtab.h" /* Needed by language.h. */ | |
32 | #include "language.h" | |
33 | #include "valprint.h" | |
34 | #include "value.h" | |
35 | #include "guile-internal.h" | |
36 | ||
37 | /* Note: Use target types here to remain consistent with the values system in | |
38 | GDB (which uses target arithmetic). */ | |
39 | ||
40 | enum valscm_unary_opcode | |
41 | { | |
42 | VALSCM_NOT, | |
43 | VALSCM_NEG, | |
44 | VALSCM_NOP, | |
45 | VALSCM_ABS, | |
46 | /* Note: This is Scheme's "logical not", not GDB's. | |
47 | GDB calls this UNOP_COMPLEMENT. */ | |
48 | VALSCM_LOGNOT | |
49 | }; | |
50 | ||
51 | enum valscm_binary_opcode | |
52 | { | |
53 | VALSCM_ADD, | |
54 | VALSCM_SUB, | |
55 | VALSCM_MUL, | |
56 | VALSCM_DIV, | |
57 | VALSCM_REM, | |
58 | VALSCM_MOD, | |
59 | VALSCM_POW, | |
60 | VALSCM_LSH, | |
61 | VALSCM_RSH, | |
62 | VALSCM_MIN, | |
63 | VALSCM_MAX, | |
64 | VALSCM_BITAND, | |
65 | VALSCM_BITOR, | |
66 | VALSCM_BITXOR | |
67 | }; | |
68 | ||
69 | /* If TYPE is a reference, return the target; otherwise return TYPE. */ | |
70 | #define STRIP_REFERENCE(TYPE) \ | |
71 | ((TYPE_CODE (TYPE) == TYPE_CODE_REF) ? (TYPE_TARGET_TYPE (TYPE)) : (TYPE)) | |
72 | ||
73 | /* Returns a value object which is the result of applying the operation | |
74 | specified by OPCODE to the given argument. | |
75 | If there's an error a Scheme exception is thrown. */ | |
76 | ||
77 | static SCM | |
78 | vlscm_unop (enum valscm_unary_opcode opcode, SCM x, const char *func_name) | |
79 | { | |
80 | struct gdbarch *gdbarch = get_current_arch (); | |
81 | const struct language_defn *language = current_language; | |
82 | struct value *arg1; | |
83 | SCM result = SCM_BOOL_F; | |
84 | struct value *res_val = NULL; | |
85 | SCM except_scm; | |
86 | struct cleanup *cleanups; | |
87 | volatile struct gdb_exception except; | |
88 | ||
89 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
90 | ||
91 | arg1 = vlscm_convert_value_from_scheme (func_name, SCM_ARG1, x, | |
92 | &except_scm, gdbarch, language); | |
93 | if (arg1 == NULL) | |
94 | { | |
95 | do_cleanups (cleanups); | |
96 | gdbscm_throw (except_scm); | |
97 | } | |
98 | ||
99 | TRY_CATCH (except, RETURN_MASK_ALL) | |
100 | { | |
101 | switch (opcode) | |
102 | { | |
103 | case VALSCM_NOT: | |
104 | /* Alas gdb and guile use the opposite meaning for "logical not". */ | |
105 | { | |
106 | struct type *type = language_bool_type (language, gdbarch); | |
107 | res_val | |
108 | = value_from_longest (type, (LONGEST) value_logical_not (arg1)); | |
109 | } | |
110 | break; | |
111 | case VALSCM_NEG: | |
112 | res_val = value_neg (arg1); | |
113 | break; | |
114 | case VALSCM_NOP: | |
115 | /* Seemingly a no-op, but if X was a Scheme value it is now | |
116 | a <gdb:value> object. */ | |
117 | res_val = arg1; | |
118 | break; | |
119 | case VALSCM_ABS: | |
120 | if (value_less (arg1, value_zero (value_type (arg1), not_lval))) | |
121 | res_val = value_neg (arg1); | |
122 | else | |
123 | res_val = arg1; | |
124 | break; | |
125 | case VALSCM_LOGNOT: | |
126 | res_val = value_complement (arg1); | |
127 | break; | |
128 | default: | |
129 | gdb_assert_not_reached ("unsupported operation"); | |
130 | } | |
131 | } | |
132 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
133 | ||
134 | gdb_assert (res_val != NULL); | |
135 | result = vlscm_scm_from_value (res_val); | |
136 | ||
137 | do_cleanups (cleanups); | |
138 | ||
139 | if (gdbscm_is_exception (result)) | |
140 | gdbscm_throw (result); | |
141 | ||
142 | return result; | |
143 | } | |
144 | ||
145 | /* Returns a value object which is the result of applying the operation | |
146 | specified by OPCODE to the given arguments. | |
147 | If there's an error a Scheme exception is thrown. */ | |
148 | ||
149 | static SCM | |
150 | vlscm_binop (enum valscm_binary_opcode opcode, SCM x, SCM y, | |
151 | const char *func_name) | |
152 | { | |
153 | struct gdbarch *gdbarch = get_current_arch (); | |
154 | const struct language_defn *language = current_language; | |
155 | struct value *arg1, *arg2; | |
156 | SCM result = SCM_BOOL_F; | |
157 | struct value *res_val = NULL; | |
158 | SCM except_scm; | |
159 | struct cleanup *cleanups; | |
160 | volatile struct gdb_exception except; | |
161 | ||
162 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
163 | ||
164 | arg1 = vlscm_convert_value_from_scheme (func_name, SCM_ARG1, x, | |
165 | &except_scm, gdbarch, language); | |
166 | if (arg1 == NULL) | |
167 | { | |
168 | do_cleanups (cleanups); | |
169 | gdbscm_throw (except_scm); | |
170 | } | |
171 | arg2 = vlscm_convert_value_from_scheme (func_name, SCM_ARG2, y, | |
172 | &except_scm, gdbarch, language); | |
173 | if (arg2 == NULL) | |
174 | { | |
175 | do_cleanups (cleanups); | |
176 | gdbscm_throw (except_scm); | |
177 | } | |
178 | ||
179 | TRY_CATCH (except, RETURN_MASK_ALL) | |
180 | { | |
181 | switch (opcode) | |
182 | { | |
183 | case VALSCM_ADD: | |
184 | { | |
185 | struct type *ltype = value_type (arg1); | |
186 | struct type *rtype = value_type (arg2); | |
187 | ||
188 | CHECK_TYPEDEF (ltype); | |
189 | ltype = STRIP_REFERENCE (ltype); | |
190 | CHECK_TYPEDEF (rtype); | |
191 | rtype = STRIP_REFERENCE (rtype); | |
192 | ||
193 | if (TYPE_CODE (ltype) == TYPE_CODE_PTR | |
194 | && is_integral_type (rtype)) | |
195 | res_val = value_ptradd (arg1, value_as_long (arg2)); | |
196 | else if (TYPE_CODE (rtype) == TYPE_CODE_PTR | |
197 | && is_integral_type (ltype)) | |
198 | res_val = value_ptradd (arg2, value_as_long (arg1)); | |
199 | else | |
200 | res_val = value_binop (arg1, arg2, BINOP_ADD); | |
201 | } | |
202 | break; | |
203 | case VALSCM_SUB: | |
204 | { | |
205 | struct type *ltype = value_type (arg1); | |
206 | struct type *rtype = value_type (arg2); | |
207 | ||
208 | CHECK_TYPEDEF (ltype); | |
209 | ltype = STRIP_REFERENCE (ltype); | |
210 | CHECK_TYPEDEF (rtype); | |
211 | rtype = STRIP_REFERENCE (rtype); | |
212 | ||
213 | if (TYPE_CODE (ltype) == TYPE_CODE_PTR | |
214 | && TYPE_CODE (rtype) == TYPE_CODE_PTR) | |
215 | { | |
216 | /* A ptrdiff_t for the target would be preferable here. */ | |
217 | res_val | |
218 | = value_from_longest (builtin_type (gdbarch)->builtin_long, | |
219 | value_ptrdiff (arg1, arg2)); | |
220 | } | |
221 | else if (TYPE_CODE (ltype) == TYPE_CODE_PTR | |
222 | && is_integral_type (rtype)) | |
223 | res_val = value_ptradd (arg1, - value_as_long (arg2)); | |
224 | else | |
225 | res_val = value_binop (arg1, arg2, BINOP_SUB); | |
226 | } | |
227 | break; | |
228 | case VALSCM_MUL: | |
229 | res_val = value_binop (arg1, arg2, BINOP_MUL); | |
230 | break; | |
231 | case VALSCM_DIV: | |
232 | res_val = value_binop (arg1, arg2, BINOP_DIV); | |
233 | break; | |
234 | case VALSCM_REM: | |
235 | res_val = value_binop (arg1, arg2, BINOP_REM); | |
236 | break; | |
237 | case VALSCM_MOD: | |
238 | res_val = value_binop (arg1, arg2, BINOP_MOD); | |
239 | break; | |
240 | case VALSCM_POW: | |
241 | res_val = value_binop (arg1, arg2, BINOP_EXP); | |
242 | break; | |
243 | case VALSCM_LSH: | |
244 | res_val = value_binop (arg1, arg2, BINOP_LSH); | |
245 | break; | |
246 | case VALSCM_RSH: | |
247 | res_val = value_binop (arg1, arg2, BINOP_RSH); | |
248 | break; | |
249 | case VALSCM_MIN: | |
250 | res_val = value_binop (arg1, arg2, BINOP_MIN); | |
251 | break; | |
252 | case VALSCM_MAX: | |
253 | res_val = value_binop (arg1, arg2, BINOP_MAX); | |
254 | break; | |
255 | case VALSCM_BITAND: | |
256 | res_val = value_binop (arg1, arg2, BINOP_BITWISE_AND); | |
257 | break; | |
258 | case VALSCM_BITOR: | |
259 | res_val = value_binop (arg1, arg2, BINOP_BITWISE_IOR); | |
260 | break; | |
261 | case VALSCM_BITXOR: | |
262 | res_val = value_binop (arg1, arg2, BINOP_BITWISE_XOR); | |
263 | break; | |
264 | default: | |
265 | gdb_assert_not_reached ("unsupported operation"); | |
266 | } | |
267 | } | |
268 | GDBSCM_HANDLE_GDB_EXCEPTION_WITH_CLEANUPS (except, cleanups); | |
269 | ||
270 | gdb_assert (res_val != NULL); | |
271 | result = vlscm_scm_from_value (res_val); | |
272 | ||
273 | do_cleanups (cleanups); | |
274 | ||
275 | if (gdbscm_is_exception (result)) | |
276 | gdbscm_throw (result); | |
277 | ||
278 | return result; | |
279 | } | |
280 | ||
281 | /* (value-add x y) -> <gdb:value> */ | |
282 | ||
283 | static SCM | |
284 | gdbscm_value_add (SCM x, SCM y) | |
285 | { | |
286 | return vlscm_binop (VALSCM_ADD, x, y, FUNC_NAME); | |
287 | } | |
288 | ||
289 | /* (value-sub x y) -> <gdb:value> */ | |
290 | ||
291 | static SCM | |
292 | gdbscm_value_sub (SCM x, SCM y) | |
293 | { | |
294 | return vlscm_binop (VALSCM_SUB, x, y, FUNC_NAME); | |
295 | } | |
296 | ||
297 | /* (value-mul x y) -> <gdb:value> */ | |
298 | ||
299 | static SCM | |
300 | gdbscm_value_mul (SCM x, SCM y) | |
301 | { | |
302 | return vlscm_binop (VALSCM_MUL, x, y, FUNC_NAME); | |
303 | } | |
304 | ||
305 | /* (value-div x y) -> <gdb:value> */ | |
306 | ||
307 | static SCM | |
308 | gdbscm_value_div (SCM x, SCM y) | |
309 | { | |
310 | return vlscm_binop (VALSCM_DIV, x, y, FUNC_NAME); | |
311 | } | |
312 | ||
313 | /* (value-rem x y) -> <gdb:value> */ | |
314 | ||
315 | static SCM | |
316 | gdbscm_value_rem (SCM x, SCM y) | |
317 | { | |
318 | return vlscm_binop (VALSCM_REM, x, y, FUNC_NAME); | |
319 | } | |
320 | ||
321 | /* (value-mod x y) -> <gdb:value> */ | |
322 | ||
323 | static SCM | |
324 | gdbscm_value_mod (SCM x, SCM y) | |
325 | { | |
326 | return vlscm_binop (VALSCM_MOD, x, y, FUNC_NAME); | |
327 | } | |
328 | ||
329 | /* (value-pow x y) -> <gdb:value> */ | |
330 | ||
331 | static SCM | |
332 | gdbscm_value_pow (SCM x, SCM y) | |
333 | { | |
334 | return vlscm_binop (VALSCM_POW, x, y, FUNC_NAME); | |
335 | } | |
336 | ||
337 | /* (value-neg x) -> <gdb:value> */ | |
338 | ||
339 | static SCM | |
340 | gdbscm_value_neg (SCM x) | |
341 | { | |
342 | return vlscm_unop (VALSCM_NEG, x, FUNC_NAME); | |
343 | } | |
344 | ||
345 | /* (value-pos x) -> <gdb:value> */ | |
346 | ||
347 | static SCM | |
348 | gdbscm_value_pos (SCM x) | |
349 | { | |
350 | return vlscm_unop (VALSCM_NOP, x, FUNC_NAME); | |
351 | } | |
352 | ||
353 | /* (value-abs x) -> <gdb:value> */ | |
354 | ||
355 | static SCM | |
356 | gdbscm_value_abs (SCM x) | |
357 | { | |
358 | return vlscm_unop (VALSCM_ABS, x, FUNC_NAME); | |
359 | } | |
360 | ||
361 | /* (value-lsh x y) -> <gdb:value> */ | |
362 | ||
363 | static SCM | |
364 | gdbscm_value_lsh (SCM x, SCM y) | |
365 | { | |
366 | return vlscm_binop (VALSCM_LSH, x, y, FUNC_NAME); | |
367 | } | |
368 | ||
369 | /* (value-rsh x y) -> <gdb:value> */ | |
370 | ||
371 | static SCM | |
372 | gdbscm_value_rsh (SCM x, SCM y) | |
373 | { | |
374 | return vlscm_binop (VALSCM_RSH, x, y, FUNC_NAME); | |
375 | } | |
376 | ||
377 | /* (value-min x y) -> <gdb:value> */ | |
378 | ||
379 | static SCM | |
380 | gdbscm_value_min (SCM x, SCM y) | |
381 | { | |
382 | return vlscm_binop (VALSCM_MIN, x, y, FUNC_NAME); | |
383 | } | |
384 | ||
385 | /* (value-max x y) -> <gdb:value> */ | |
386 | ||
387 | static SCM | |
388 | gdbscm_value_max (SCM x, SCM y) | |
389 | { | |
390 | return vlscm_binop (VALSCM_MAX, x, y, FUNC_NAME); | |
391 | } | |
392 | ||
393 | /* (value-not x) -> <gdb:value> */ | |
394 | ||
395 | static SCM | |
396 | gdbscm_value_not (SCM x) | |
397 | { | |
398 | return vlscm_unop (VALSCM_NOT, x, FUNC_NAME); | |
399 | } | |
400 | ||
401 | /* (value-lognot x) -> <gdb:value> */ | |
402 | ||
403 | static SCM | |
404 | gdbscm_value_lognot (SCM x) | |
405 | { | |
406 | return vlscm_unop (VALSCM_LOGNOT, x, FUNC_NAME); | |
407 | } | |
408 | ||
409 | /* (value-logand x y) -> <gdb:value> */ | |
410 | ||
411 | static SCM | |
412 | gdbscm_value_logand (SCM x, SCM y) | |
413 | { | |
414 | return vlscm_binop (VALSCM_BITAND, x, y, FUNC_NAME); | |
415 | } | |
416 | ||
417 | /* (value-logior x y) -> <gdb:value> */ | |
418 | ||
419 | static SCM | |
420 | gdbscm_value_logior (SCM x, SCM y) | |
421 | { | |
422 | return vlscm_binop (VALSCM_BITOR, x, y, FUNC_NAME); | |
423 | } | |
424 | ||
425 | /* (value-logxor x y) -> <gdb:value> */ | |
426 | ||
427 | static SCM | |
428 | gdbscm_value_logxor (SCM x, SCM y) | |
429 | { | |
430 | return vlscm_binop (VALSCM_BITXOR, x, y, FUNC_NAME); | |
431 | } | |
432 | ||
433 | /* Utility to perform all value comparisons. | |
434 | If there's an error a Scheme exception is thrown. */ | |
435 | ||
436 | static SCM | |
437 | vlscm_rich_compare (int op, SCM x, SCM y, const char *func_name) | |
438 | { | |
439 | struct gdbarch *gdbarch = get_current_arch (); | |
440 | const struct language_defn *language = current_language; | |
441 | struct value *v1, *v2; | |
442 | int result = 0; | |
443 | SCM except_scm; | |
444 | struct cleanup *cleanups; | |
445 | volatile struct gdb_exception except; | |
446 | ||
447 | cleanups = make_cleanup_value_free_to_mark (value_mark ()); | |
448 | ||
449 | v1 = vlscm_convert_value_from_scheme (func_name, SCM_ARG1, x, | |
450 | &except_scm, gdbarch, language); | |
451 | if (v1 == NULL) | |
452 | { | |
453 | do_cleanups (cleanups); | |
454 | gdbscm_throw (except_scm); | |
455 | } | |
456 | v2 = vlscm_convert_value_from_scheme (func_name, SCM_ARG2, y, | |
457 | &except_scm, gdbarch, language); | |
458 | if (v2 == NULL) | |
459 | { | |
460 | do_cleanups (cleanups); | |
461 | gdbscm_throw (except_scm); | |
462 | } | |
463 | ||
464 | TRY_CATCH (except, RETURN_MASK_ALL) | |
465 | { | |
466 | switch (op) | |
467 | { | |
468 | case BINOP_LESS: | |
469 | result = value_less (v1, v2); | |
470 | break; | |
471 | case BINOP_LEQ: | |
472 | result = (value_less (v1, v2) | |
473 | || value_equal (v1, v2)); | |
474 | break; | |
475 | case BINOP_EQUAL: | |
476 | result = value_equal (v1, v2); | |
477 | break; | |
478 | case BINOP_NOTEQUAL: | |
479 | gdb_assert_not_reached ("not-equal not implemented"); | |
480 | case BINOP_GTR: | |
481 | result = value_less (v2, v1); | |
482 | break; | |
483 | case BINOP_GEQ: | |
484 | result = (value_less (v2, v1) | |
485 | || value_equal (v1, v2)); | |
486 | break; | |
487 | default: | |
488 | gdb_assert_not_reached ("invalid <gdb:value> comparison"); | |
489 | } | |
490 | } | |
491 | do_cleanups (cleanups); | |
492 | GDBSCM_HANDLE_GDB_EXCEPTION (except); | |
493 | ||
494 | return scm_from_bool (result); | |
495 | } | |
496 | ||
497 | /* (value=? x y) -> boolean | |
498 | There is no "not-equal?" function (value!= ?) on purpose. | |
499 | We're following string=?, etc. as our Guide here. */ | |
500 | ||
501 | static SCM | |
502 | gdbscm_value_eq_p (SCM x, SCM y) | |
503 | { | |
504 | return vlscm_rich_compare (BINOP_EQUAL, x, y, FUNC_NAME); | |
505 | } | |
506 | ||
507 | /* (value<? x y) -> boolean */ | |
508 | ||
509 | static SCM | |
510 | gdbscm_value_lt_p (SCM x, SCM y) | |
511 | { | |
512 | return vlscm_rich_compare (BINOP_LESS, x, y, FUNC_NAME); | |
513 | } | |
514 | ||
515 | /* (value<=? x y) -> boolean */ | |
516 | ||
517 | static SCM | |
518 | gdbscm_value_le_p (SCM x, SCM y) | |
519 | { | |
520 | return vlscm_rich_compare (BINOP_LEQ, x, y, FUNC_NAME); | |
521 | } | |
522 | ||
523 | /* (value>? x y) -> boolean */ | |
524 | ||
525 | static SCM | |
526 | gdbscm_value_gt_p (SCM x, SCM y) | |
527 | { | |
528 | return vlscm_rich_compare (BINOP_GTR, x, y, FUNC_NAME); | |
529 | } | |
530 | ||
531 | /* (value>=? x y) -> boolean */ | |
532 | ||
533 | static SCM | |
534 | gdbscm_value_ge_p (SCM x, SCM y) | |
535 | { | |
536 | return vlscm_rich_compare (BINOP_GEQ, x, y, FUNC_NAME); | |
537 | } | |
538 | \f | |
539 | /* Subroutine of vlscm_convert_typed_value_from_scheme to simplify it. | |
540 | Convert OBJ, a Scheme number, to a <gdb:value> object. | |
541 | OBJ_ARG_POS is its position in the argument list, used in exception text. | |
542 | ||
543 | TYPE is the result type. TYPE_ARG_POS is its position in | |
544 | the argument list, used in exception text. | |
545 | TYPE_SCM is Scheme object wrapping TYPE, used in exception text. | |
546 | ||
547 | If the number isn't representable, e.g. it's too big, a <gdb:exception> | |
548 | object is stored in *EXCEPT_SCMP and NULL is returned. | |
549 | The conversion may throw a gdb error, e.g., if TYPE is invalid. */ | |
550 | ||
551 | static struct value * | |
552 | vlscm_convert_typed_number (const char *func_name, int obj_arg_pos, SCM obj, | |
553 | int type_arg_pos, SCM type_scm, struct type *type, | |
554 | struct gdbarch *gdbarch, SCM *except_scmp) | |
555 | { | |
556 | if (is_integral_type (type) | |
557 | || TYPE_CODE (type) == TYPE_CODE_PTR) | |
558 | { | |
559 | if (TYPE_UNSIGNED (type)) | |
560 | { | |
561 | ULONGEST max; | |
562 | ||
563 | get_unsigned_type_max (type, &max); | |
564 | if (!scm_is_unsigned_integer (obj, 0, max)) | |
565 | { | |
566 | *except_scmp | |
567 | = gdbscm_make_out_of_range_error (func_name, | |
568 | obj_arg_pos, obj, | |
569 | _("value out of range for type")); | |
570 | return NULL; | |
571 | } | |
572 | return value_from_longest (type, gdbscm_scm_to_ulongest (obj)); | |
573 | } | |
574 | else | |
575 | { | |
576 | LONGEST min, max; | |
577 | ||
578 | get_signed_type_minmax (type, &min, &max); | |
579 | if (!scm_is_signed_integer (obj, min, max)) | |
580 | { | |
581 | *except_scmp | |
582 | = gdbscm_make_out_of_range_error (func_name, | |
583 | obj_arg_pos, obj, | |
584 | _("value out of range for type")); | |
585 | return NULL; | |
586 | } | |
587 | return value_from_longest (type, gdbscm_scm_to_longest (obj)); | |
588 | } | |
589 | } | |
590 | else if (TYPE_CODE (type) == TYPE_CODE_FLT) | |
591 | return value_from_double (type, scm_to_double (obj)); | |
592 | else | |
593 | { | |
594 | *except_scmp = gdbscm_make_type_error (func_name, obj_arg_pos, obj, | |
595 | NULL); | |
596 | return NULL; | |
597 | } | |
598 | } | |
599 | ||
600 | /* Return non-zero if OBJ, an integer, fits in TYPE. */ | |
601 | ||
602 | static int | |
603 | vlscm_integer_fits_p (SCM obj, struct type *type) | |
604 | { | |
605 | if (TYPE_UNSIGNED (type)) | |
606 | { | |
607 | ULONGEST max; | |
608 | ||
609 | /* If scm_is_unsigned_integer can't work with this type, just punt. */ | |
610 | if (TYPE_LENGTH (type) > sizeof (scm_t_uintmax)) | |
611 | return 0; | |
612 | get_unsigned_type_max (type, &max); | |
613 | return scm_is_unsigned_integer (obj, 0, max); | |
614 | } | |
615 | else | |
616 | { | |
617 | LONGEST min, max; | |
618 | ||
619 | /* If scm_is_signed_integer can't work with this type, just punt. */ | |
620 | if (TYPE_LENGTH (type) > sizeof (scm_t_intmax)) | |
621 | return 0; | |
622 | get_signed_type_minmax (type, &min, &max); | |
623 | return scm_is_signed_integer (obj, min, max); | |
624 | } | |
625 | } | |
626 | ||
627 | /* Subroutine of vlscm_convert_typed_value_from_scheme to simplify it. | |
628 | Convert OBJ, a Scheme number, to a <gdb:value> object. | |
629 | OBJ_ARG_POS is its position in the argument list, used in exception text. | |
630 | ||
631 | If OBJ is an integer, then the smallest int that will hold the value in | |
632 | the following progression is chosen: | |
633 | int, unsigned int, long, unsigned long, long long, unsigned long long. | |
634 | Otherwise, if OBJ is a real number, then it is converted to a double. | |
635 | Otherwise an exception is thrown. | |
636 | ||
637 | If the number isn't representable, e.g. it's too big, a <gdb:exception> | |
638 | object is stored in *EXCEPT_SCMP and NULL is returned. */ | |
639 | ||
640 | static struct value * | |
641 | vlscm_convert_number (const char *func_name, int obj_arg_pos, SCM obj, | |
642 | struct gdbarch *gdbarch, SCM *except_scmp) | |
643 | { | |
644 | const struct builtin_type *bt = builtin_type (gdbarch); | |
645 | ||
646 | /* One thing to keep in mind here is that we are interested in the | |
647 | target's representation of OBJ, not the host's. */ | |
648 | ||
649 | if (scm_is_exact (obj) && scm_is_integer (obj)) | |
650 | { | |
651 | if (vlscm_integer_fits_p (obj, bt->builtin_int)) | |
652 | return value_from_longest (bt->builtin_int, | |
653 | gdbscm_scm_to_longest (obj)); | |
654 | if (vlscm_integer_fits_p (obj, bt->builtin_unsigned_int)) | |
655 | return value_from_longest (bt->builtin_unsigned_int, | |
656 | gdbscm_scm_to_ulongest (obj)); | |
657 | if (vlscm_integer_fits_p (obj, bt->builtin_long)) | |
658 | return value_from_longest (bt->builtin_long, | |
659 | gdbscm_scm_to_longest (obj)); | |
660 | if (vlscm_integer_fits_p (obj, bt->builtin_unsigned_long)) | |
661 | return value_from_longest (bt->builtin_unsigned_long, | |
662 | gdbscm_scm_to_ulongest (obj)); | |
663 | if (vlscm_integer_fits_p (obj, bt->builtin_long_long)) | |
664 | return value_from_longest (bt->builtin_long_long, | |
665 | gdbscm_scm_to_longest (obj)); | |
666 | if (vlscm_integer_fits_p (obj, bt->builtin_unsigned_long_long)) | |
667 | return value_from_longest (bt->builtin_unsigned_long_long, | |
668 | gdbscm_scm_to_ulongest (obj)); | |
669 | } | |
670 | else if (scm_is_real (obj)) | |
671 | return value_from_double (bt->builtin_double, scm_to_double (obj)); | |
672 | ||
673 | *except_scmp = gdbscm_make_out_of_range_error (func_name, obj_arg_pos, obj, | |
674 | _("value not a number representable on the target")); | |
675 | return NULL; | |
676 | } | |
677 | ||
678 | /* Subroutine of vlscm_convert_typed_value_from_scheme to simplify it. | |
679 | Convert BV, a Scheme bytevector, to a <gdb:value> object. | |
680 | ||
681 | TYPE, if non-NULL, is the result type. Otherwise, a vector of type | |
682 | uint8_t is used. | |
683 | TYPE_SCM is Scheme object wrapping TYPE, used in exception text, | |
684 | or #f if TYPE is NULL. | |
685 | ||
686 | If the bytevector isn't the same size as the type, then a <gdb:exception> | |
687 | object is stored in *EXCEPT_SCMP, and NULL is returned. */ | |
688 | ||
689 | static struct value * | |
690 | vlscm_convert_bytevector (SCM bv, struct type *type, SCM type_scm, | |
691 | int arg_pos, const char *func_name, | |
692 | SCM *except_scmp, struct gdbarch *gdbarch) | |
693 | { | |
694 | LONGEST length = SCM_BYTEVECTOR_LENGTH (bv); | |
695 | struct value *value; | |
696 | ||
697 | if (type == NULL) | |
698 | { | |
699 | type = builtin_type (gdbarch)->builtin_uint8; | |
700 | type = lookup_array_range_type (type, 0, length); | |
701 | make_vector_type (type); | |
702 | } | |
703 | type = check_typedef (type); | |
704 | if (TYPE_LENGTH (type) != length) | |
705 | { | |
706 | *except_scmp = gdbscm_make_out_of_range_error (func_name, arg_pos, | |
707 | type_scm, | |
708 | _("size of type does not match size of bytevector")); | |
709 | return NULL; | |
710 | } | |
711 | ||
712 | value = value_from_contents (type, | |
713 | (gdb_byte *) SCM_BYTEVECTOR_CONTENTS (bv)); | |
714 | return value; | |
715 | } | |
716 | ||
717 | /* Convert OBJ, a Scheme value, to a <gdb:value> object. | |
718 | OBJ_ARG_POS is its position in the argument list, used in exception text. | |
719 | ||
720 | TYPE, if non-NULL, is the result type which must be compatible with | |
721 | the value being converted. | |
722 | If TYPE is NULL then a suitable default type is chosen. | |
723 | TYPE_SCM is Scheme object wrapping TYPE, used in exception text, | |
724 | or SCM_UNDEFINED if TYPE is NULL. | |
725 | TYPE_ARG_POS is its position in the argument list, used in exception text, | |
726 | or -1 if TYPE is NULL. | |
727 | ||
728 | OBJ may also be a <gdb:value> object, in which case a copy is returned | |
729 | and TYPE must be NULL. | |
730 | ||
731 | If the value cannot be converted, NULL is returned and a gdb:exception | |
732 | object is stored in *EXCEPT_SCMP. | |
733 | Otherwise the new value is returned, added to the all_values chain. */ | |
734 | ||
735 | struct value * | |
736 | vlscm_convert_typed_value_from_scheme (const char *func_name, | |
737 | int obj_arg_pos, SCM obj, | |
738 | int type_arg_pos, SCM type_scm, | |
739 | struct type *type, | |
740 | SCM *except_scmp, | |
741 | struct gdbarch *gdbarch, | |
742 | const struct language_defn *language) | |
743 | { | |
744 | struct value *value = NULL; | |
745 | SCM except_scm = SCM_BOOL_F; | |
746 | volatile struct gdb_exception except; | |
747 | ||
748 | if (type == NULL) | |
749 | { | |
750 | gdb_assert (type_arg_pos == -1); | |
751 | gdb_assert (SCM_UNBNDP (type_scm)); | |
752 | } | |
753 | ||
754 | *except_scmp = SCM_BOOL_F; | |
755 | ||
756 | TRY_CATCH (except, RETURN_MASK_ALL) | |
757 | { | |
758 | if (vlscm_is_value (obj)) | |
759 | { | |
760 | if (type != NULL) | |
761 | { | |
762 | except_scm = gdbscm_make_misc_error (func_name, type_arg_pos, | |
763 | type_scm, | |
764 | _("No type allowed")); | |
765 | value = NULL; | |
766 | } | |
767 | else | |
768 | value = value_copy (vlscm_scm_to_value (obj)); | |
769 | } | |
770 | else if (gdbscm_is_true (scm_bytevector_p (obj))) | |
771 | { | |
772 | value = vlscm_convert_bytevector (obj, type, type_scm, | |
773 | obj_arg_pos, func_name, | |
774 | &except_scm, gdbarch); | |
775 | } | |
776 | else if (gdbscm_is_bool (obj)) | |
777 | { | |
778 | if (type != NULL | |
779 | && !is_integral_type (type)) | |
780 | { | |
781 | except_scm = gdbscm_make_type_error (func_name, type_arg_pos, | |
782 | type_scm, NULL); | |
783 | } | |
784 | else | |
785 | { | |
786 | value = value_from_longest (type | |
787 | ? type | |
788 | : language_bool_type (language, | |
789 | gdbarch), | |
790 | gdbscm_is_true (obj)); | |
791 | } | |
792 | } | |
793 | else if (scm_is_number (obj)) | |
794 | { | |
795 | if (type != NULL) | |
796 | { | |
797 | value = vlscm_convert_typed_number (func_name, obj_arg_pos, obj, | |
798 | type_arg_pos, type_scm, type, | |
799 | gdbarch, &except_scm); | |
800 | } | |
801 | else | |
802 | { | |
803 | value = vlscm_convert_number (func_name, obj_arg_pos, obj, | |
804 | gdbarch, &except_scm); | |
805 | } | |
806 | } | |
807 | else if (scm_is_string (obj)) | |
808 | { | |
809 | char *s; | |
810 | size_t len; | |
811 | struct cleanup *cleanup; | |
812 | ||
813 | if (type != NULL) | |
814 | { | |
815 | except_scm = gdbscm_make_misc_error (func_name, type_arg_pos, | |
816 | type_scm, | |
817 | _("No type allowed")); | |
818 | value = NULL; | |
819 | } | |
820 | else | |
821 | { | |
822 | /* TODO: Provide option to specify conversion strategy. */ | |
823 | s = gdbscm_scm_to_string (obj, &len, | |
824 | target_charset (gdbarch), | |
825 | 0 /*non-strict*/, | |
826 | &except_scm); | |
827 | if (s != NULL) | |
828 | { | |
829 | cleanup = make_cleanup (xfree, s); | |
830 | value | |
831 | = value_cstring (s, len, | |
832 | language_string_char_type (language, | |
833 | gdbarch)); | |
834 | do_cleanups (cleanup); | |
835 | } | |
836 | else | |
837 | value = NULL; | |
838 | } | |
839 | } | |
840 | else if (lsscm_is_lazy_string (obj)) | |
841 | { | |
842 | if (type != NULL) | |
843 | { | |
844 | except_scm = gdbscm_make_misc_error (func_name, type_arg_pos, | |
845 | type_scm, | |
846 | _("No type allowed")); | |
847 | value = NULL; | |
848 | } | |
849 | else | |
850 | { | |
851 | value = lsscm_safe_lazy_string_to_value (obj, obj_arg_pos, | |
852 | func_name, | |
853 | &except_scm); | |
854 | } | |
855 | } | |
856 | else /* OBJ isn't anything we support. */ | |
857 | { | |
858 | except_scm = gdbscm_make_type_error (func_name, obj_arg_pos, obj, | |
859 | NULL); | |
860 | value = NULL; | |
861 | } | |
862 | } | |
863 | if (except.reason < 0) | |
864 | except_scm = gdbscm_scm_from_gdb_exception (except); | |
865 | ||
866 | if (gdbscm_is_true (except_scm)) | |
867 | { | |
868 | gdb_assert (value == NULL); | |
869 | *except_scmp = except_scm; | |
870 | } | |
871 | ||
872 | return value; | |
873 | } | |
874 | ||
875 | /* Wrapper around vlscm_convert_typed_value_from_scheme for cases where there | |
876 | is no supplied type. See vlscm_convert_typed_value_from_scheme for | |
877 | details. */ | |
878 | ||
879 | struct value * | |
880 | vlscm_convert_value_from_scheme (const char *func_name, | |
881 | int obj_arg_pos, SCM obj, | |
882 | SCM *except_scmp, struct gdbarch *gdbarch, | |
883 | const struct language_defn *language) | |
884 | { | |
885 | return vlscm_convert_typed_value_from_scheme (func_name, obj_arg_pos, obj, | |
886 | -1, SCM_UNDEFINED, NULL, | |
887 | except_scmp, | |
888 | gdbarch, language); | |
889 | } | |
890 | \f | |
891 | /* Initialize value math support. */ | |
892 | ||
893 | static const scheme_function math_functions[] = | |
894 | { | |
895 | { "value-add", 2, 0, 0, gdbscm_value_add, | |
896 | "\ | |
897 | Return a + b." }, | |
898 | ||
899 | { "value-sub", 2, 0, 0, gdbscm_value_sub, | |
900 | "\ | |
901 | Return a - b." }, | |
902 | ||
903 | { "value-mul", 2, 0, 0, gdbscm_value_mul, | |
904 | "\ | |
905 | Return a * b." }, | |
906 | ||
907 | { "value-div", 2, 0, 0, gdbscm_value_div, | |
908 | "\ | |
909 | Return a / b." }, | |
910 | ||
911 | { "value-rem", 2, 0, 0, gdbscm_value_rem, | |
912 | "\ | |
913 | Return a % b." }, | |
914 | ||
915 | { "value-mod", 2, 0, 0, gdbscm_value_mod, | |
916 | "\ | |
917 | Return a mod b. See Knuth 1.2.4." }, | |
918 | ||
919 | { "value-pow", 2, 0, 0, gdbscm_value_pow, | |
920 | "\ | |
921 | Return pow (x, y)." }, | |
922 | ||
923 | { "value-not", 1, 0, 0, gdbscm_value_not, | |
924 | "\ | |
925 | Return !a." }, | |
926 | ||
927 | { "value-neg", 1, 0, 0, gdbscm_value_neg, | |
928 | "\ | |
929 | Return -a." }, | |
930 | ||
931 | { "value-pos", 1, 0, 0, gdbscm_value_pos, | |
932 | "\ | |
933 | Return a." }, | |
934 | ||
935 | { "value-abs", 1, 0, 0, gdbscm_value_abs, | |
936 | "\ | |
937 | Return abs (a)." }, | |
938 | ||
939 | { "value-lsh", 2, 0, 0, gdbscm_value_lsh, | |
940 | "\ | |
941 | Return a << b." }, | |
942 | ||
943 | { "value-rsh", 2, 0, 0, gdbscm_value_rsh, | |
944 | "\ | |
945 | Return a >> b." }, | |
946 | ||
947 | { "value-min", 2, 0, 0, gdbscm_value_min, | |
948 | "\ | |
949 | Return min (a, b)." }, | |
950 | ||
951 | { "value-max", 2, 0, 0, gdbscm_value_max, | |
952 | "\ | |
953 | Return max (a, b)." }, | |
954 | ||
955 | { "value-lognot", 1, 0, 0, gdbscm_value_lognot, | |
956 | "\ | |
957 | Return ~a." }, | |
958 | ||
959 | { "value-logand", 2, 0, 0, gdbscm_value_logand, | |
960 | "\ | |
961 | Return a & b." }, | |
962 | ||
963 | { "value-logior", 2, 0, 0, gdbscm_value_logior, | |
964 | "\ | |
965 | Return a | b." }, | |
966 | ||
967 | { "value-logxor", 2, 0, 0, gdbscm_value_logxor, | |
968 | "\ | |
969 | Return a ^ b." }, | |
970 | ||
971 | { "value=?", 2, 0, 0, gdbscm_value_eq_p, | |
972 | "\ | |
973 | Return a == b." }, | |
974 | ||
975 | { "value<?", 2, 0, 0, gdbscm_value_lt_p, | |
976 | "\ | |
977 | Return a < b." }, | |
978 | ||
979 | { "value<=?", 2, 0, 0, gdbscm_value_le_p, | |
980 | "\ | |
981 | Return a <= b." }, | |
982 | ||
983 | { "value>?", 2, 0, 0, gdbscm_value_gt_p, | |
984 | "\ | |
985 | Return a > b." }, | |
986 | ||
987 | { "value>=?", 2, 0, 0, gdbscm_value_ge_p, | |
988 | "\ | |
989 | Return a >= b." }, | |
990 | ||
991 | END_FUNCTIONS | |
992 | }; | |
993 | ||
994 | void | |
995 | gdbscm_initialize_math (void) | |
996 | { | |
997 | gdbscm_define_functions (math_functions, 1); | |
998 | } |