Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Perform non-arithmetic operations on values, for GDB. |
990a07ab | 2 | |
9b254dd1 DJ |
3 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
4 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, | |
0fb0cc75 | 5 | 2008, 2009 Free Software Foundation, Inc. |
c906108c | 6 | |
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "symtab.h" | |
24 | #include "gdbtypes.h" | |
25 | #include "value.h" | |
26 | #include "frame.h" | |
27 | #include "inferior.h" | |
28 | #include "gdbcore.h" | |
29 | #include "target.h" | |
30 | #include "demangle.h" | |
31 | #include "language.h" | |
32 | #include "gdbcmd.h" | |
4e052eda | 33 | #include "regcache.h" |
015a42b4 | 34 | #include "cp-abi.h" |
fe898f56 | 35 | #include "block.h" |
04714b91 | 36 | #include "infcall.h" |
de4f826b | 37 | #include "dictionary.h" |
b6429628 | 38 | #include "cp-support.h" |
4ef30785 | 39 | #include "dfp.h" |
029a67e4 | 40 | #include "user-regs.h" |
c906108c SS |
41 | |
42 | #include <errno.h> | |
43 | #include "gdb_string.h" | |
4a1970e4 | 44 | #include "gdb_assert.h" |
79c2c32d | 45 | #include "cp-support.h" |
f4c5303c | 46 | #include "observer.h" |
3e3b026f UW |
47 | #include "objfiles.h" |
48 | #include "symtab.h" | |
c906108c | 49 | |
070ad9f0 | 50 | extern int overload_debug; |
c906108c SS |
51 | /* Local functions. */ |
52 | ||
ad2f7632 DJ |
53 | static int typecmp (int staticp, int varargs, int nargs, |
54 | struct field t1[], struct value *t2[]); | |
c906108c | 55 | |
ac3eeb49 MS |
56 | static struct value *search_struct_field (char *, struct value *, |
57 | int, struct type *, int); | |
c906108c | 58 | |
f23631e4 AC |
59 | static struct value *search_struct_method (char *, struct value **, |
60 | struct value **, | |
a14ed312 | 61 | int, int *, struct type *); |
c906108c | 62 | |
ac3eeb49 MS |
63 | static int find_oload_champ_namespace (struct type **, int, |
64 | const char *, const char *, | |
65 | struct symbol ***, | |
66 | struct badness_vector **); | |
8d577d32 DC |
67 | |
68 | static | |
ac3eeb49 MS |
69 | int find_oload_champ_namespace_loop (struct type **, int, |
70 | const char *, const char *, | |
71 | int, struct symbol ***, | |
72 | struct badness_vector **, int *); | |
73 | ||
74 | static int find_oload_champ (struct type **, int, int, int, | |
75 | struct fn_field *, struct symbol **, | |
76 | struct badness_vector **); | |
77 | ||
78 | static int oload_method_static (int, struct fn_field *, int); | |
8d577d32 DC |
79 | |
80 | enum oload_classification { STANDARD, NON_STANDARD, INCOMPATIBLE }; | |
81 | ||
82 | static enum | |
ac3eeb49 MS |
83 | oload_classification classify_oload_match (struct badness_vector *, |
84 | int, int); | |
8d577d32 | 85 | |
ac3eeb49 MS |
86 | static struct value *value_struct_elt_for_reference (struct type *, |
87 | int, struct type *, | |
88 | char *, | |
89 | struct type *, | |
90 | int, enum noside); | |
79c2c32d | 91 | |
ac3eeb49 MS |
92 | static struct value *value_namespace_elt (const struct type *, |
93 | char *, int , enum noside); | |
79c2c32d | 94 | |
ac3eeb49 MS |
95 | static struct value *value_maybe_namespace_elt (const struct type *, |
96 | char *, int, | |
97 | enum noside); | |
63d06c5c | 98 | |
a14ed312 | 99 | static CORE_ADDR allocate_space_in_inferior (int); |
c906108c | 100 | |
f23631e4 | 101 | static struct value *cast_into_complex (struct type *, struct value *); |
c906108c | 102 | |
ac3eeb49 MS |
103 | static struct fn_field *find_method_list (struct value **, char *, |
104 | int, struct type *, int *, | |
105 | struct type **, int *); | |
7a292a7a | 106 | |
a14ed312 | 107 | void _initialize_valops (void); |
c906108c | 108 | |
c906108c | 109 | #if 0 |
ac3eeb49 MS |
110 | /* Flag for whether we want to abandon failed expression evals by |
111 | default. */ | |
112 | ||
c906108c SS |
113 | static int auto_abandon = 0; |
114 | #endif | |
115 | ||
116 | int overload_resolution = 0; | |
920d2a44 AC |
117 | static void |
118 | show_overload_resolution (struct ui_file *file, int from_tty, | |
ac3eeb49 MS |
119 | struct cmd_list_element *c, |
120 | const char *value) | |
920d2a44 AC |
121 | { |
122 | fprintf_filtered (file, _("\ | |
123 | Overload resolution in evaluating C++ functions is %s.\n"), | |
124 | value); | |
125 | } | |
242bfc55 | 126 | |
3e3b026f UW |
127 | /* Find the address of function name NAME in the inferior. If OBJF_P |
128 | is non-NULL, *OBJF_P will be set to the OBJFILE where the function | |
129 | is defined. */ | |
c906108c | 130 | |
f23631e4 | 131 | struct value * |
3e3b026f | 132 | find_function_in_inferior (const char *name, struct objfile **objf_p) |
c906108c | 133 | { |
52f0bd74 | 134 | struct symbol *sym; |
2570f2b7 | 135 | sym = lookup_symbol (name, 0, VAR_DOMAIN, 0); |
c906108c SS |
136 | if (sym != NULL) |
137 | { | |
138 | if (SYMBOL_CLASS (sym) != LOC_BLOCK) | |
139 | { | |
8a3fe4f8 | 140 | error (_("\"%s\" exists in this program but is not a function."), |
c906108c SS |
141 | name); |
142 | } | |
3e3b026f UW |
143 | |
144 | if (objf_p) | |
145 | *objf_p = SYMBOL_SYMTAB (sym)->objfile; | |
146 | ||
c906108c SS |
147 | return value_of_variable (sym, NULL); |
148 | } | |
149 | else | |
150 | { | |
ac3eeb49 MS |
151 | struct minimal_symbol *msymbol = |
152 | lookup_minimal_symbol (name, NULL, NULL); | |
c906108c SS |
153 | if (msymbol != NULL) |
154 | { | |
3e3b026f UW |
155 | struct objfile *objfile = msymbol_objfile (msymbol); |
156 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
157 | ||
c906108c | 158 | struct type *type; |
4478b372 | 159 | CORE_ADDR maddr; |
3e3b026f | 160 | type = lookup_pointer_type (builtin_type (gdbarch)->builtin_char); |
c906108c SS |
161 | type = lookup_function_type (type); |
162 | type = lookup_pointer_type (type); | |
4478b372 | 163 | maddr = SYMBOL_VALUE_ADDRESS (msymbol); |
3e3b026f UW |
164 | |
165 | if (objf_p) | |
166 | *objf_p = objfile; | |
167 | ||
4478b372 | 168 | return value_from_pointer (type, maddr); |
c906108c SS |
169 | } |
170 | else | |
171 | { | |
c5aa993b | 172 | if (!target_has_execution) |
8a3fe4f8 | 173 | error (_("evaluation of this expression requires the target program to be active")); |
c5aa993b | 174 | else |
8a3fe4f8 | 175 | error (_("evaluation of this expression requires the program to have a function \"%s\"."), name); |
c906108c SS |
176 | } |
177 | } | |
178 | } | |
179 | ||
ac3eeb49 MS |
180 | /* Allocate NBYTES of space in the inferior using the inferior's |
181 | malloc and return a value that is a pointer to the allocated | |
182 | space. */ | |
c906108c | 183 | |
f23631e4 | 184 | struct value * |
fba45db2 | 185 | value_allocate_space_in_inferior (int len) |
c906108c | 186 | { |
3e3b026f UW |
187 | struct objfile *objf; |
188 | struct value *val = find_function_in_inferior ("malloc", &objf); | |
189 | struct gdbarch *gdbarch = get_objfile_arch (objf); | |
f23631e4 | 190 | struct value *blocklen; |
c906108c | 191 | |
3e3b026f | 192 | blocklen = value_from_longest (builtin_type (gdbarch)->builtin_int, len); |
c906108c SS |
193 | val = call_function_by_hand (val, 1, &blocklen); |
194 | if (value_logical_not (val)) | |
195 | { | |
196 | if (!target_has_execution) | |
8a3fe4f8 | 197 | error (_("No memory available to program now: you need to start the target first")); |
c5aa993b | 198 | else |
8a3fe4f8 | 199 | error (_("No memory available to program: call to malloc failed")); |
c906108c SS |
200 | } |
201 | return val; | |
202 | } | |
203 | ||
204 | static CORE_ADDR | |
fba45db2 | 205 | allocate_space_in_inferior (int len) |
c906108c SS |
206 | { |
207 | return value_as_long (value_allocate_space_in_inferior (len)); | |
208 | } | |
209 | ||
6af87b03 AR |
210 | /* Cast struct value VAL to type TYPE and return as a value. |
211 | Both type and val must be of TYPE_CODE_STRUCT or TYPE_CODE_UNION | |
694182d2 DJ |
212 | for this to work. Typedef to one of the codes is permitted. |
213 | Returns NULL if the cast is neither an upcast nor a downcast. */ | |
6af87b03 AR |
214 | |
215 | static struct value * | |
216 | value_cast_structs (struct type *type, struct value *v2) | |
217 | { | |
218 | struct type *t1; | |
219 | struct type *t2; | |
220 | struct value *v; | |
221 | ||
222 | gdb_assert (type != NULL && v2 != NULL); | |
223 | ||
224 | t1 = check_typedef (type); | |
225 | t2 = check_typedef (value_type (v2)); | |
226 | ||
227 | /* Check preconditions. */ | |
228 | gdb_assert ((TYPE_CODE (t1) == TYPE_CODE_STRUCT | |
229 | || TYPE_CODE (t1) == TYPE_CODE_UNION) | |
230 | && !!"Precondition is that type is of STRUCT or UNION kind."); | |
231 | gdb_assert ((TYPE_CODE (t2) == TYPE_CODE_STRUCT | |
232 | || TYPE_CODE (t2) == TYPE_CODE_UNION) | |
233 | && !!"Precondition is that value is of STRUCT or UNION kind"); | |
234 | ||
235 | /* Upcasting: look in the type of the source to see if it contains the | |
236 | type of the target as a superclass. If so, we'll need to | |
237 | offset the pointer rather than just change its type. */ | |
238 | if (TYPE_NAME (t1) != NULL) | |
239 | { | |
240 | v = search_struct_field (type_name_no_tag (t1), | |
241 | v2, 0, t2, 1); | |
242 | if (v) | |
243 | return v; | |
244 | } | |
245 | ||
246 | /* Downcasting: look in the type of the target to see if it contains the | |
247 | type of the source as a superclass. If so, we'll need to | |
248 | offset the pointer rather than just change its type. | |
249 | FIXME: This fails silently with virtual inheritance. */ | |
250 | if (TYPE_NAME (t2) != NULL) | |
251 | { | |
252 | v = search_struct_field (type_name_no_tag (t2), | |
253 | value_zero (t1, not_lval), 0, t1, 1); | |
254 | if (v) | |
255 | { | |
256 | /* Downcasting is possible (t1 is superclass of v2). */ | |
257 | CORE_ADDR addr2 = VALUE_ADDRESS (v2); | |
258 | addr2 -= (VALUE_ADDRESS (v) | |
259 | + value_offset (v) | |
260 | + value_embedded_offset (v)); | |
261 | return value_at (type, addr2); | |
262 | } | |
263 | } | |
694182d2 DJ |
264 | |
265 | return NULL; | |
6af87b03 AR |
266 | } |
267 | ||
fb933624 DJ |
268 | /* Cast one pointer or reference type to another. Both TYPE and |
269 | the type of ARG2 should be pointer types, or else both should be | |
270 | reference types. Returns the new pointer or reference. */ | |
271 | ||
272 | struct value * | |
273 | value_cast_pointers (struct type *type, struct value *arg2) | |
274 | { | |
6af87b03 | 275 | struct type *type1 = check_typedef (type); |
fb933624 DJ |
276 | struct type *type2 = check_typedef (value_type (arg2)); |
277 | struct type *t1 = check_typedef (TYPE_TARGET_TYPE (type)); | |
278 | struct type *t2 = check_typedef (TYPE_TARGET_TYPE (type2)); | |
279 | ||
280 | if (TYPE_CODE (t1) == TYPE_CODE_STRUCT | |
281 | && TYPE_CODE (t2) == TYPE_CODE_STRUCT | |
282 | && !value_logical_not (arg2)) | |
283 | { | |
6af87b03 | 284 | struct value *v2; |
fb933624 | 285 | |
6af87b03 AR |
286 | if (TYPE_CODE (type2) == TYPE_CODE_REF) |
287 | v2 = coerce_ref (arg2); | |
288 | else | |
289 | v2 = value_ind (arg2); | |
680b56ce | 290 | gdb_assert (TYPE_CODE (check_typedef (value_type (v2))) == TYPE_CODE_STRUCT |
6af87b03 AR |
291 | && !!"Why did coercion fail?"); |
292 | v2 = value_cast_structs (t1, v2); | |
293 | /* At this point we have what we can have, un-dereference if needed. */ | |
294 | if (v2) | |
fb933624 | 295 | { |
6af87b03 AR |
296 | struct value *v = value_addr (v2); |
297 | deprecated_set_value_type (v, type); | |
298 | return v; | |
fb933624 | 299 | } |
6af87b03 | 300 | } |
fb933624 DJ |
301 | |
302 | /* No superclass found, just change the pointer type. */ | |
0d5de010 | 303 | arg2 = value_copy (arg2); |
fb933624 DJ |
304 | deprecated_set_value_type (arg2, type); |
305 | arg2 = value_change_enclosing_type (arg2, type); | |
306 | set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */ | |
307 | return arg2; | |
308 | } | |
309 | ||
c906108c SS |
310 | /* Cast value ARG2 to type TYPE and return as a value. |
311 | More general than a C cast: accepts any two types of the same length, | |
312 | and if ARG2 is an lvalue it can be cast into anything at all. */ | |
313 | /* In C++, casts may change pointer or object representations. */ | |
314 | ||
f23631e4 AC |
315 | struct value * |
316 | value_cast (struct type *type, struct value *arg2) | |
c906108c | 317 | { |
52f0bd74 AC |
318 | enum type_code code1; |
319 | enum type_code code2; | |
320 | int scalar; | |
c906108c SS |
321 | struct type *type2; |
322 | ||
323 | int convert_to_boolean = 0; | |
c5aa993b | 324 | |
df407dfe | 325 | if (value_type (arg2) == type) |
c906108c SS |
326 | return arg2; |
327 | ||
6af87b03 AR |
328 | code1 = TYPE_CODE (check_typedef (type)); |
329 | ||
330 | /* Check if we are casting struct reference to struct reference. */ | |
331 | if (code1 == TYPE_CODE_REF) | |
332 | { | |
333 | /* We dereference type; then we recurse and finally | |
334 | we generate value of the given reference. Nothing wrong with | |
335 | that. */ | |
336 | struct type *t1 = check_typedef (type); | |
337 | struct type *dereftype = check_typedef (TYPE_TARGET_TYPE (t1)); | |
338 | struct value *val = value_cast (dereftype, arg2); | |
339 | return value_ref (val); | |
340 | } | |
341 | ||
342 | code2 = TYPE_CODE (check_typedef (value_type (arg2))); | |
343 | ||
344 | if (code2 == TYPE_CODE_REF) | |
345 | /* We deref the value and then do the cast. */ | |
346 | return value_cast (type, coerce_ref (arg2)); | |
347 | ||
c906108c SS |
348 | CHECK_TYPEDEF (type); |
349 | code1 = TYPE_CODE (type); | |
994b9211 | 350 | arg2 = coerce_ref (arg2); |
df407dfe | 351 | type2 = check_typedef (value_type (arg2)); |
c906108c | 352 | |
fb933624 DJ |
353 | /* You can't cast to a reference type. See value_cast_pointers |
354 | instead. */ | |
355 | gdb_assert (code1 != TYPE_CODE_REF); | |
356 | ||
ac3eeb49 MS |
357 | /* A cast to an undetermined-length array_type, such as |
358 | (TYPE [])OBJECT, is treated like a cast to (TYPE [N])OBJECT, | |
359 | where N is sizeof(OBJECT)/sizeof(TYPE). */ | |
c906108c SS |
360 | if (code1 == TYPE_CODE_ARRAY) |
361 | { | |
362 | struct type *element_type = TYPE_TARGET_TYPE (type); | |
363 | unsigned element_length = TYPE_LENGTH (check_typedef (element_type)); | |
d78df370 | 364 | if (element_length > 0 && TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type)) |
c906108c SS |
365 | { |
366 | struct type *range_type = TYPE_INDEX_TYPE (type); | |
367 | int val_length = TYPE_LENGTH (type2); | |
368 | LONGEST low_bound, high_bound, new_length; | |
369 | if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0) | |
370 | low_bound = 0, high_bound = 0; | |
371 | new_length = val_length / element_length; | |
372 | if (val_length % element_length != 0) | |
8a3fe4f8 | 373 | warning (_("array element type size does not divide object size in cast")); |
ac3eeb49 MS |
374 | /* FIXME-type-allocation: need a way to free this type when |
375 | we are done with it. */ | |
c906108c SS |
376 | range_type = create_range_type ((struct type *) NULL, |
377 | TYPE_TARGET_TYPE (range_type), | |
378 | low_bound, | |
379 | new_length + low_bound - 1); | |
ac3eeb49 MS |
380 | deprecated_set_value_type (arg2, |
381 | create_array_type ((struct type *) NULL, | |
382 | element_type, | |
383 | range_type)); | |
c906108c SS |
384 | return arg2; |
385 | } | |
386 | } | |
387 | ||
388 | if (current_language->c_style_arrays | |
389 | && TYPE_CODE (type2) == TYPE_CODE_ARRAY) | |
390 | arg2 = value_coerce_array (arg2); | |
391 | ||
392 | if (TYPE_CODE (type2) == TYPE_CODE_FUNC) | |
393 | arg2 = value_coerce_function (arg2); | |
394 | ||
df407dfe | 395 | type2 = check_typedef (value_type (arg2)); |
c906108c SS |
396 | code2 = TYPE_CODE (type2); |
397 | ||
398 | if (code1 == TYPE_CODE_COMPLEX) | |
399 | return cast_into_complex (type, arg2); | |
400 | if (code1 == TYPE_CODE_BOOL) | |
401 | { | |
402 | code1 = TYPE_CODE_INT; | |
403 | convert_to_boolean = 1; | |
404 | } | |
405 | if (code1 == TYPE_CODE_CHAR) | |
406 | code1 = TYPE_CODE_INT; | |
407 | if (code2 == TYPE_CODE_BOOL || code2 == TYPE_CODE_CHAR) | |
408 | code2 = TYPE_CODE_INT; | |
409 | ||
410 | scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT | |
4ef30785 TJB |
411 | || code2 == TYPE_CODE_DECFLOAT || code2 == TYPE_CODE_ENUM |
412 | || code2 == TYPE_CODE_RANGE); | |
c906108c | 413 | |
6af87b03 AR |
414 | if ((code1 == TYPE_CODE_STRUCT || code1 == TYPE_CODE_UNION) |
415 | && (code2 == TYPE_CODE_STRUCT || code2 == TYPE_CODE_UNION) | |
c906108c | 416 | && TYPE_NAME (type) != 0) |
694182d2 DJ |
417 | { |
418 | struct value *v = value_cast_structs (type, arg2); | |
419 | if (v) | |
420 | return v; | |
421 | } | |
422 | ||
c906108c SS |
423 | if (code1 == TYPE_CODE_FLT && scalar) |
424 | return value_from_double (type, value_as_double (arg2)); | |
4ef30785 TJB |
425 | else if (code1 == TYPE_CODE_DECFLOAT && scalar) |
426 | { | |
427 | int dec_len = TYPE_LENGTH (type); | |
428 | gdb_byte dec[16]; | |
429 | ||
430 | if (code2 == TYPE_CODE_FLT) | |
431 | decimal_from_floating (arg2, dec, dec_len); | |
432 | else if (code2 == TYPE_CODE_DECFLOAT) | |
433 | decimal_convert (value_contents (arg2), TYPE_LENGTH (type2), | |
434 | dec, dec_len); | |
435 | else | |
436 | /* The only option left is an integral type. */ | |
437 | decimal_from_integral (arg2, dec, dec_len); | |
438 | ||
439 | return value_from_decfloat (type, dec); | |
440 | } | |
c906108c SS |
441 | else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM |
442 | || code1 == TYPE_CODE_RANGE) | |
0d5de010 DJ |
443 | && (scalar || code2 == TYPE_CODE_PTR |
444 | || code2 == TYPE_CODE_MEMBERPTR)) | |
c906108c SS |
445 | { |
446 | LONGEST longest; | |
c5aa993b | 447 | |
2bf1f4a1 | 448 | /* When we cast pointers to integers, we mustn't use |
76e71323 | 449 | gdbarch_pointer_to_address to find the address the pointer |
2bf1f4a1 JB |
450 | represents, as value_as_long would. GDB should evaluate |
451 | expressions just as the compiler would --- and the compiler | |
452 | sees a cast as a simple reinterpretation of the pointer's | |
453 | bits. */ | |
454 | if (code2 == TYPE_CODE_PTR) | |
0fd88904 | 455 | longest = extract_unsigned_integer (value_contents (arg2), |
2bf1f4a1 JB |
456 | TYPE_LENGTH (type2)); |
457 | else | |
458 | longest = value_as_long (arg2); | |
802db21b | 459 | return value_from_longest (type, convert_to_boolean ? |
716c501e | 460 | (LONGEST) (longest ? 1 : 0) : longest); |
c906108c | 461 | } |
ac3eeb49 MS |
462 | else if (code1 == TYPE_CODE_PTR && (code2 == TYPE_CODE_INT |
463 | || code2 == TYPE_CODE_ENUM | |
464 | || code2 == TYPE_CODE_RANGE)) | |
634acd5f | 465 | { |
4603e466 DT |
466 | /* TYPE_LENGTH (type) is the length of a pointer, but we really |
467 | want the length of an address! -- we are really dealing with | |
468 | addresses (i.e., gdb representations) not pointers (i.e., | |
469 | target representations) here. | |
470 | ||
471 | This allows things like "print *(int *)0x01000234" to work | |
472 | without printing a misleading message -- which would | |
473 | otherwise occur when dealing with a target having two byte | |
474 | pointers and four byte addresses. */ | |
475 | ||
17a912b6 | 476 | int addr_bit = gdbarch_addr_bit (current_gdbarch); |
4603e466 | 477 | |
634acd5f | 478 | LONGEST longest = value_as_long (arg2); |
4603e466 | 479 | if (addr_bit < sizeof (LONGEST) * HOST_CHAR_BIT) |
634acd5f | 480 | { |
4603e466 DT |
481 | if (longest >= ((LONGEST) 1 << addr_bit) |
482 | || longest <= -((LONGEST) 1 << addr_bit)) | |
8a3fe4f8 | 483 | warning (_("value truncated")); |
634acd5f AC |
484 | } |
485 | return value_from_longest (type, longest); | |
486 | } | |
0d5de010 DJ |
487 | else if (code1 == TYPE_CODE_METHODPTR && code2 == TYPE_CODE_INT |
488 | && value_as_long (arg2) == 0) | |
489 | { | |
490 | struct value *result = allocate_value (type); | |
ad4820ab | 491 | cplus_make_method_ptr (type, value_contents_writeable (result), 0, 0); |
0d5de010 DJ |
492 | return result; |
493 | } | |
494 | else if (code1 == TYPE_CODE_MEMBERPTR && code2 == TYPE_CODE_INT | |
495 | && value_as_long (arg2) == 0) | |
496 | { | |
497 | /* The Itanium C++ ABI represents NULL pointers to members as | |
498 | minus one, instead of biasing the normal case. */ | |
499 | return value_from_longest (type, -1); | |
500 | } | |
c906108c SS |
501 | else if (TYPE_LENGTH (type) == TYPE_LENGTH (type2)) |
502 | { | |
503 | if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR) | |
fb933624 DJ |
504 | return value_cast_pointers (type, arg2); |
505 | ||
0d5de010 | 506 | arg2 = value_copy (arg2); |
04624583 | 507 | deprecated_set_value_type (arg2, type); |
2b127877 | 508 | arg2 = value_change_enclosing_type (arg2, type); |
b44d461b | 509 | set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */ |
c906108c SS |
510 | return arg2; |
511 | } | |
c906108c | 512 | else if (VALUE_LVAL (arg2) == lval_memory) |
ac3eeb49 MS |
513 | return value_at_lazy (type, |
514 | VALUE_ADDRESS (arg2) + value_offset (arg2)); | |
c906108c SS |
515 | else if (code1 == TYPE_CODE_VOID) |
516 | { | |
517 | return value_zero (builtin_type_void, not_lval); | |
518 | } | |
519 | else | |
520 | { | |
8a3fe4f8 | 521 | error (_("Invalid cast.")); |
c906108c SS |
522 | return 0; |
523 | } | |
524 | } | |
525 | ||
526 | /* Create a value of type TYPE that is zero, and return it. */ | |
527 | ||
f23631e4 | 528 | struct value * |
fba45db2 | 529 | value_zero (struct type *type, enum lval_type lv) |
c906108c | 530 | { |
f23631e4 | 531 | struct value *val = allocate_value (type); |
c906108c SS |
532 | VALUE_LVAL (val) = lv; |
533 | ||
534 | return val; | |
535 | } | |
536 | ||
301f0ecf DE |
537 | /* Create a value of numeric type TYPE that is one, and return it. */ |
538 | ||
539 | struct value * | |
540 | value_one (struct type *type, enum lval_type lv) | |
541 | { | |
542 | struct type *type1 = check_typedef (type); | |
543 | struct value *val = NULL; /* avoid -Wall warning */ | |
544 | ||
545 | if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT) | |
546 | { | |
6d84d3d8 | 547 | struct value *int_one = value_from_longest (builtin_type_int32, 1); |
301f0ecf DE |
548 | struct value *val; |
549 | gdb_byte v[16]; | |
550 | ||
6d84d3d8 | 551 | decimal_from_integral (int_one, v, TYPE_LENGTH (builtin_type_int32)); |
301f0ecf DE |
552 | val = value_from_decfloat (type, v); |
553 | } | |
554 | else if (TYPE_CODE (type1) == TYPE_CODE_FLT) | |
555 | { | |
556 | val = value_from_double (type, (DOUBLEST) 1); | |
557 | } | |
558 | else if (is_integral_type (type1)) | |
559 | { | |
560 | val = value_from_longest (type, (LONGEST) 1); | |
561 | } | |
562 | else | |
563 | { | |
564 | error (_("Not a numeric type.")); | |
565 | } | |
566 | ||
567 | VALUE_LVAL (val) = lv; | |
568 | return val; | |
569 | } | |
570 | ||
070ad9f0 | 571 | /* Return a value with type TYPE located at ADDR. |
c906108c SS |
572 | |
573 | Call value_at only if the data needs to be fetched immediately; | |
574 | if we can be 'lazy' and defer the fetch, perhaps indefinately, call | |
575 | value_at_lazy instead. value_at_lazy simply records the address of | |
070ad9f0 | 576 | the data and sets the lazy-evaluation-required flag. The lazy flag |
0fd88904 | 577 | is tested in the value_contents macro, which is used if and when |
070ad9f0 | 578 | the contents are actually required. |
c906108c SS |
579 | |
580 | Note: value_at does *NOT* handle embedded offsets; perform such | |
ac3eeb49 | 581 | adjustments before or after calling it. */ |
c906108c | 582 | |
f23631e4 | 583 | struct value * |
00a4c844 | 584 | value_at (struct type *type, CORE_ADDR addr) |
c906108c | 585 | { |
f23631e4 | 586 | struct value *val; |
c906108c SS |
587 | |
588 | if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID) | |
8a3fe4f8 | 589 | error (_("Attempt to dereference a generic pointer.")); |
c906108c SS |
590 | |
591 | val = allocate_value (type); | |
592 | ||
990a07ab | 593 | read_memory (addr, value_contents_all_raw (val), TYPE_LENGTH (type)); |
c906108c SS |
594 | |
595 | VALUE_LVAL (val) = lval_memory; | |
596 | VALUE_ADDRESS (val) = addr; | |
c906108c SS |
597 | |
598 | return val; | |
599 | } | |
600 | ||
601 | /* Return a lazy value with type TYPE located at ADDR (cf. value_at). */ | |
602 | ||
f23631e4 | 603 | struct value * |
00a4c844 | 604 | value_at_lazy (struct type *type, CORE_ADDR addr) |
c906108c | 605 | { |
f23631e4 | 606 | struct value *val; |
c906108c SS |
607 | |
608 | if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID) | |
8a3fe4f8 | 609 | error (_("Attempt to dereference a generic pointer.")); |
c906108c | 610 | |
3e3d7139 | 611 | val = allocate_value_lazy (type); |
c906108c SS |
612 | |
613 | VALUE_LVAL (val) = lval_memory; | |
614 | VALUE_ADDRESS (val) = addr; | |
c906108c SS |
615 | |
616 | return val; | |
617 | } | |
618 | ||
0fd88904 | 619 | /* Called only from the value_contents and value_contents_all() |
46615f07 | 620 | macros, if the current data for a variable needs to be loaded into |
0fd88904 | 621 | value_contents(VAL). Fetches the data from the user's process, and |
46615f07 AC |
622 | clears the lazy flag to indicate that the data in the buffer is |
623 | valid. | |
c906108c | 624 | |
ac3eeb49 MS |
625 | If the value is zero-length, we avoid calling read_memory, which |
626 | would abort. We mark the value as fetched anyway -- all 0 bytes of | |
627 | it. | |
c906108c | 628 | |
ac3eeb49 MS |
629 | This function returns a value because it is used in the |
630 | value_contents macro as part of an expression, where a void would | |
631 | not work. The value is ignored. */ | |
c906108c SS |
632 | |
633 | int | |
f23631e4 | 634 | value_fetch_lazy (struct value *val) |
c906108c | 635 | { |
3e3d7139 JG |
636 | gdb_assert (value_lazy (val)); |
637 | allocate_value_contents (val); | |
9214ee5f DJ |
638 | if (VALUE_LVAL (val) == lval_memory) |
639 | { | |
640 | CORE_ADDR addr = VALUE_ADDRESS (val) + value_offset (val); | |
694182d2 | 641 | int length = TYPE_LENGTH (check_typedef (value_enclosing_type (val))); |
9214ee5f | 642 | |
9214ee5f DJ |
643 | if (length) |
644 | read_memory (addr, value_contents_all_raw (val), length); | |
645 | } | |
646 | else if (VALUE_LVAL (val) == lval_register) | |
647 | { | |
669fac23 DJ |
648 | struct frame_info *frame; |
649 | int regnum; | |
9214ee5f | 650 | struct type *type = check_typedef (value_type (val)); |
669fac23 | 651 | struct value *new_val = val, *mark = value_mark (); |
c906108c | 652 | |
669fac23 DJ |
653 | /* Offsets are not supported here; lazy register values must |
654 | refer to the entire register. */ | |
655 | gdb_assert (value_offset (val) == 0); | |
9214ee5f | 656 | |
669fac23 DJ |
657 | while (VALUE_LVAL (new_val) == lval_register && value_lazy (new_val)) |
658 | { | |
659 | frame = frame_find_by_id (VALUE_FRAME_ID (new_val)); | |
660 | regnum = VALUE_REGNUM (new_val); | |
661 | ||
662 | gdb_assert (frame != NULL); | |
9214ee5f | 663 | |
669fac23 DJ |
664 | /* Convertible register routines are used for multi-register |
665 | values and for interpretation in different types | |
666 | (e.g. float or int from a double register). Lazy | |
667 | register values should have the register's natural type, | |
668 | so they do not apply. */ | |
669 | gdb_assert (!gdbarch_convert_register_p (get_frame_arch (frame), | |
670 | regnum, type)); | |
671 | ||
672 | new_val = get_frame_register_value (frame, regnum); | |
673 | } | |
674 | ||
675 | /* If it's still lazy (for instance, a saved register on the | |
676 | stack), fetch it. */ | |
677 | if (value_lazy (new_val)) | |
678 | value_fetch_lazy (new_val); | |
679 | ||
680 | /* If the register was not saved, mark it unavailable. */ | |
681 | if (value_optimized_out (new_val)) | |
9214ee5f | 682 | set_value_optimized_out (val, 1); |
669fac23 DJ |
683 | else |
684 | memcpy (value_contents_raw (val), value_contents (new_val), | |
685 | TYPE_LENGTH (type)); | |
686 | ||
687 | if (frame_debug) | |
688 | { | |
029a67e4 | 689 | struct gdbarch *gdbarch; |
669fac23 DJ |
690 | frame = frame_find_by_id (VALUE_FRAME_ID (val)); |
691 | regnum = VALUE_REGNUM (val); | |
029a67e4 | 692 | gdbarch = get_frame_arch (frame); |
669fac23 DJ |
693 | |
694 | fprintf_unfiltered (gdb_stdlog, "\ | |
695 | { value_fetch_lazy (frame=%d,regnum=%d(%s),...) ", | |
696 | frame_relative_level (frame), regnum, | |
029a67e4 | 697 | user_reg_map_regnum_to_name (gdbarch, regnum)); |
669fac23 DJ |
698 | |
699 | fprintf_unfiltered (gdb_stdlog, "->"); | |
700 | if (value_optimized_out (new_val)) | |
701 | fprintf_unfiltered (gdb_stdlog, " optimized out"); | |
702 | else | |
703 | { | |
704 | int i; | |
705 | const gdb_byte *buf = value_contents (new_val); | |
706 | ||
707 | if (VALUE_LVAL (new_val) == lval_register) | |
708 | fprintf_unfiltered (gdb_stdlog, " register=%d", | |
709 | VALUE_REGNUM (new_val)); | |
710 | else if (VALUE_LVAL (new_val) == lval_memory) | |
711 | fprintf_unfiltered (gdb_stdlog, " address=0x%s", | |
712 | paddr_nz (VALUE_ADDRESS (new_val))); | |
713 | else | |
714 | fprintf_unfiltered (gdb_stdlog, " computed"); | |
715 | ||
716 | fprintf_unfiltered (gdb_stdlog, " bytes="); | |
717 | fprintf_unfiltered (gdb_stdlog, "["); | |
029a67e4 | 718 | for (i = 0; i < register_size (gdbarch, regnum); i++) |
669fac23 DJ |
719 | fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]); |
720 | fprintf_unfiltered (gdb_stdlog, "]"); | |
721 | } | |
722 | ||
723 | fprintf_unfiltered (gdb_stdlog, " }\n"); | |
724 | } | |
725 | ||
726 | /* Dispose of the intermediate values. This prevents | |
727 | watchpoints from trying to watch the saved frame pointer. */ | |
728 | value_free_to_mark (mark); | |
9214ee5f DJ |
729 | } |
730 | else | |
731 | internal_error (__FILE__, __LINE__, "Unexpected lazy value type."); | |
802db21b | 732 | |
dfa52d88 | 733 | set_value_lazy (val, 0); |
c906108c SS |
734 | return 0; |
735 | } | |
736 | ||
737 | ||
738 | /* Store the contents of FROMVAL into the location of TOVAL. | |
739 | Return a new value with the location of TOVAL and contents of FROMVAL. */ | |
740 | ||
f23631e4 AC |
741 | struct value * |
742 | value_assign (struct value *toval, struct value *fromval) | |
c906108c | 743 | { |
52f0bd74 | 744 | struct type *type; |
f23631e4 | 745 | struct value *val; |
cb741690 | 746 | struct frame_id old_frame; |
c906108c | 747 | |
88e3b34b | 748 | if (!deprecated_value_modifiable (toval)) |
8a3fe4f8 | 749 | error (_("Left operand of assignment is not a modifiable lvalue.")); |
c906108c | 750 | |
994b9211 | 751 | toval = coerce_ref (toval); |
c906108c | 752 | |
df407dfe | 753 | type = value_type (toval); |
c906108c | 754 | if (VALUE_LVAL (toval) != lval_internalvar) |
63092375 DJ |
755 | { |
756 | toval = value_coerce_to_target (toval); | |
757 | fromval = value_cast (type, fromval); | |
758 | } | |
c906108c | 759 | else |
63092375 DJ |
760 | { |
761 | /* Coerce arrays and functions to pointers, except for arrays | |
762 | which only live in GDB's storage. */ | |
763 | if (!value_must_coerce_to_target (fromval)) | |
764 | fromval = coerce_array (fromval); | |
765 | } | |
766 | ||
c906108c SS |
767 | CHECK_TYPEDEF (type); |
768 | ||
ac3eeb49 MS |
769 | /* Since modifying a register can trash the frame chain, and |
770 | modifying memory can trash the frame cache, we save the old frame | |
771 | and then restore the new frame afterwards. */ | |
206415a3 | 772 | old_frame = get_frame_id (deprecated_safe_get_selected_frame ()); |
cb741690 | 773 | |
c906108c SS |
774 | switch (VALUE_LVAL (toval)) |
775 | { | |
776 | case lval_internalvar: | |
777 | set_internalvar (VALUE_INTERNALVAR (toval), fromval); | |
778 | val = value_copy (VALUE_INTERNALVAR (toval)->value); | |
ac3eeb49 MS |
779 | val = value_change_enclosing_type (val, |
780 | value_enclosing_type (fromval)); | |
13c3b5f5 | 781 | set_value_embedded_offset (val, value_embedded_offset (fromval)); |
ac3eeb49 MS |
782 | set_value_pointed_to_offset (val, |
783 | value_pointed_to_offset (fromval)); | |
c906108c SS |
784 | return val; |
785 | ||
786 | case lval_internalvar_component: | |
787 | set_internalvar_component (VALUE_INTERNALVAR (toval), | |
df407dfe AC |
788 | value_offset (toval), |
789 | value_bitpos (toval), | |
790 | value_bitsize (toval), | |
c906108c SS |
791 | fromval); |
792 | break; | |
793 | ||
794 | case lval_memory: | |
795 | { | |
fc1a4b47 | 796 | const gdb_byte *dest_buffer; |
c5aa993b JM |
797 | CORE_ADDR changed_addr; |
798 | int changed_len; | |
10c42a71 | 799 | gdb_byte buffer[sizeof (LONGEST)]; |
c906108c | 800 | |
df407dfe | 801 | if (value_bitsize (toval)) |
c5aa993b | 802 | { |
ac3eeb49 MS |
803 | /* We assume that the argument to read_memory is in units |
804 | of host chars. FIXME: Is that correct? */ | |
df407dfe AC |
805 | changed_len = (value_bitpos (toval) |
806 | + value_bitsize (toval) | |
c5aa993b JM |
807 | + HOST_CHAR_BIT - 1) |
808 | / HOST_CHAR_BIT; | |
c906108c SS |
809 | |
810 | if (changed_len > (int) sizeof (LONGEST)) | |
8a3fe4f8 | 811 | error (_("Can't handle bitfields which don't fit in a %d bit word."), |
baa6f10b | 812 | (int) sizeof (LONGEST) * HOST_CHAR_BIT); |
c906108c | 813 | |
df407dfe | 814 | read_memory (VALUE_ADDRESS (toval) + value_offset (toval), |
c906108c SS |
815 | buffer, changed_len); |
816 | modify_field (buffer, value_as_long (fromval), | |
df407dfe AC |
817 | value_bitpos (toval), value_bitsize (toval)); |
818 | changed_addr = VALUE_ADDRESS (toval) + value_offset (toval); | |
c906108c SS |
819 | dest_buffer = buffer; |
820 | } | |
c906108c SS |
821 | else |
822 | { | |
df407dfe | 823 | changed_addr = VALUE_ADDRESS (toval) + value_offset (toval); |
c906108c | 824 | changed_len = TYPE_LENGTH (type); |
0fd88904 | 825 | dest_buffer = value_contents (fromval); |
c906108c SS |
826 | } |
827 | ||
828 | write_memory (changed_addr, dest_buffer, changed_len); | |
9a4105ab AC |
829 | if (deprecated_memory_changed_hook) |
830 | deprecated_memory_changed_hook (changed_addr, changed_len); | |
c906108c SS |
831 | } |
832 | break; | |
833 | ||
492254e9 | 834 | case lval_register: |
c906108c | 835 | { |
c906108c | 836 | struct frame_info *frame; |
ff2e87ac | 837 | int value_reg; |
c906108c SS |
838 | |
839 | /* Figure out which frame this is in currently. */ | |
0c16dd26 AC |
840 | frame = frame_find_by_id (VALUE_FRAME_ID (toval)); |
841 | value_reg = VALUE_REGNUM (toval); | |
c906108c SS |
842 | |
843 | if (!frame) | |
8a3fe4f8 | 844 | error (_("Value being assigned to is no longer active.")); |
492254e9 | 845 | |
c1afe53d UW |
846 | if (gdbarch_convert_register_p |
847 | (current_gdbarch, VALUE_REGNUM (toval), type)) | |
492254e9 | 848 | { |
ff2e87ac | 849 | /* If TOVAL is a special machine register requiring |
ac3eeb49 MS |
850 | conversion of program values to a special raw |
851 | format. */ | |
852 | gdbarch_value_to_register (current_gdbarch, frame, | |
853 | VALUE_REGNUM (toval), type, | |
854 | value_contents (fromval)); | |
492254e9 | 855 | } |
c906108c | 856 | else |
492254e9 | 857 | { |
df407dfe | 858 | if (value_bitsize (toval)) |
00fa51f6 UW |
859 | { |
860 | int changed_len; | |
861 | gdb_byte buffer[sizeof (LONGEST)]; | |
862 | ||
863 | changed_len = (value_bitpos (toval) | |
864 | + value_bitsize (toval) | |
865 | + HOST_CHAR_BIT - 1) | |
866 | / HOST_CHAR_BIT; | |
867 | ||
868 | if (changed_len > (int) sizeof (LONGEST)) | |
869 | error (_("Can't handle bitfields which don't fit in a %d bit word."), | |
870 | (int) sizeof (LONGEST) * HOST_CHAR_BIT); | |
871 | ||
872 | get_frame_register_bytes (frame, value_reg, | |
873 | value_offset (toval), | |
874 | changed_len, buffer); | |
875 | ||
876 | modify_field (buffer, value_as_long (fromval), | |
ac3eeb49 MS |
877 | value_bitpos (toval), |
878 | value_bitsize (toval)); | |
00fa51f6 UW |
879 | |
880 | put_frame_register_bytes (frame, value_reg, | |
881 | value_offset (toval), | |
882 | changed_len, buffer); | |
883 | } | |
c906108c | 884 | else |
00fa51f6 UW |
885 | { |
886 | put_frame_register_bytes (frame, value_reg, | |
887 | value_offset (toval), | |
888 | TYPE_LENGTH (type), | |
889 | value_contents (fromval)); | |
890 | } | |
ff2e87ac | 891 | } |
00fa51f6 | 892 | |
9a4105ab AC |
893 | if (deprecated_register_changed_hook) |
894 | deprecated_register_changed_hook (-1); | |
f4c5303c | 895 | observer_notify_target_changed (¤t_target); |
ff2e87ac | 896 | break; |
c906108c | 897 | } |
492254e9 | 898 | |
c906108c | 899 | default: |
8a3fe4f8 | 900 | error (_("Left operand of assignment is not an lvalue.")); |
c906108c SS |
901 | } |
902 | ||
cb741690 DJ |
903 | /* Assigning to the stack pointer, frame pointer, and other |
904 | (architecture and calling convention specific) registers may | |
905 | cause the frame cache to be out of date. Assigning to memory | |
906 | also can. We just do this on all assignments to registers or | |
907 | memory, for simplicity's sake; I doubt the slowdown matters. */ | |
908 | switch (VALUE_LVAL (toval)) | |
909 | { | |
910 | case lval_memory: | |
911 | case lval_register: | |
cb741690 DJ |
912 | |
913 | reinit_frame_cache (); | |
914 | ||
ac3eeb49 MS |
915 | /* Having destroyed the frame cache, restore the selected |
916 | frame. */ | |
cb741690 DJ |
917 | |
918 | /* FIXME: cagney/2002-11-02: There has to be a better way of | |
919 | doing this. Instead of constantly saving/restoring the | |
920 | frame. Why not create a get_selected_frame() function that, | |
921 | having saved the selected frame's ID can automatically | |
922 | re-find the previously selected frame automatically. */ | |
923 | ||
924 | { | |
925 | struct frame_info *fi = frame_find_by_id (old_frame); | |
926 | if (fi != NULL) | |
927 | select_frame (fi); | |
928 | } | |
929 | ||
930 | break; | |
931 | default: | |
932 | break; | |
933 | } | |
934 | ||
ac3eeb49 MS |
935 | /* If the field does not entirely fill a LONGEST, then zero the sign |
936 | bits. If the field is signed, and is negative, then sign | |
937 | extend. */ | |
df407dfe AC |
938 | if ((value_bitsize (toval) > 0) |
939 | && (value_bitsize (toval) < 8 * (int) sizeof (LONGEST))) | |
c906108c SS |
940 | { |
941 | LONGEST fieldval = value_as_long (fromval); | |
df407dfe | 942 | LONGEST valmask = (((ULONGEST) 1) << value_bitsize (toval)) - 1; |
c906108c SS |
943 | |
944 | fieldval &= valmask; | |
ac3eeb49 MS |
945 | if (!TYPE_UNSIGNED (type) |
946 | && (fieldval & (valmask ^ (valmask >> 1)))) | |
c906108c SS |
947 | fieldval |= ~valmask; |
948 | ||
949 | fromval = value_from_longest (type, fieldval); | |
950 | } | |
951 | ||
952 | val = value_copy (toval); | |
0fd88904 | 953 | memcpy (value_contents_raw (val), value_contents (fromval), |
c906108c | 954 | TYPE_LENGTH (type)); |
04624583 | 955 | deprecated_set_value_type (val, type); |
ac3eeb49 MS |
956 | val = value_change_enclosing_type (val, |
957 | value_enclosing_type (fromval)); | |
13c3b5f5 | 958 | set_value_embedded_offset (val, value_embedded_offset (fromval)); |
b44d461b | 959 | set_value_pointed_to_offset (val, value_pointed_to_offset (fromval)); |
c5aa993b | 960 | |
c906108c SS |
961 | return val; |
962 | } | |
963 | ||
964 | /* Extend a value VAL to COUNT repetitions of its type. */ | |
965 | ||
f23631e4 AC |
966 | struct value * |
967 | value_repeat (struct value *arg1, int count) | |
c906108c | 968 | { |
f23631e4 | 969 | struct value *val; |
c906108c SS |
970 | |
971 | if (VALUE_LVAL (arg1) != lval_memory) | |
8a3fe4f8 | 972 | error (_("Only values in memory can be extended with '@'.")); |
c906108c | 973 | if (count < 1) |
8a3fe4f8 | 974 | error (_("Invalid number %d of repetitions."), count); |
c906108c | 975 | |
4754a64e | 976 | val = allocate_repeat_value (value_enclosing_type (arg1), count); |
c906108c | 977 | |
df407dfe | 978 | read_memory (VALUE_ADDRESS (arg1) + value_offset (arg1), |
990a07ab | 979 | value_contents_all_raw (val), |
4754a64e | 980 | TYPE_LENGTH (value_enclosing_type (val))); |
c906108c | 981 | VALUE_LVAL (val) = lval_memory; |
df407dfe | 982 | VALUE_ADDRESS (val) = VALUE_ADDRESS (arg1) + value_offset (arg1); |
c906108c SS |
983 | |
984 | return val; | |
985 | } | |
986 | ||
f23631e4 | 987 | struct value * |
fba45db2 | 988 | value_of_variable (struct symbol *var, struct block *b) |
c906108c | 989 | { |
f23631e4 | 990 | struct value *val; |
c906108c SS |
991 | struct frame_info *frame = NULL; |
992 | ||
993 | if (!b) | |
994 | frame = NULL; /* Use selected frame. */ | |
995 | else if (symbol_read_needs_frame (var)) | |
996 | { | |
997 | frame = block_innermost_frame (b); | |
998 | if (!frame) | |
c5aa993b | 999 | { |
c906108c | 1000 | if (BLOCK_FUNCTION (b) |
de5ad195 | 1001 | && SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b))) |
8a3fe4f8 | 1002 | error (_("No frame is currently executing in block %s."), |
de5ad195 | 1003 | SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b))); |
c906108c | 1004 | else |
8a3fe4f8 | 1005 | error (_("No frame is currently executing in specified block")); |
c5aa993b | 1006 | } |
c906108c SS |
1007 | } |
1008 | ||
1009 | val = read_var_value (var, frame); | |
1010 | if (!val) | |
8a3fe4f8 | 1011 | error (_("Address of symbol \"%s\" is unknown."), SYMBOL_PRINT_NAME (var)); |
c906108c SS |
1012 | |
1013 | return val; | |
1014 | } | |
1015 | ||
63092375 DJ |
1016 | /* Return one if VAL does not live in target memory, but should in order |
1017 | to operate on it. Otherwise return zero. */ | |
1018 | ||
1019 | int | |
1020 | value_must_coerce_to_target (struct value *val) | |
1021 | { | |
1022 | struct type *valtype; | |
1023 | ||
1024 | /* The only lval kinds which do not live in target memory. */ | |
1025 | if (VALUE_LVAL (val) != not_lval | |
1026 | && VALUE_LVAL (val) != lval_internalvar) | |
1027 | return 0; | |
1028 | ||
1029 | valtype = check_typedef (value_type (val)); | |
1030 | ||
1031 | switch (TYPE_CODE (valtype)) | |
1032 | { | |
1033 | case TYPE_CODE_ARRAY: | |
1034 | case TYPE_CODE_STRING: | |
1035 | return 1; | |
1036 | default: | |
1037 | return 0; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | /* Make sure that VAL lives in target memory if it's supposed to. For instance, | |
1042 | strings are constructed as character arrays in GDB's storage, and this | |
1043 | function copies them to the target. */ | |
1044 | ||
1045 | struct value * | |
1046 | value_coerce_to_target (struct value *val) | |
1047 | { | |
1048 | LONGEST length; | |
1049 | CORE_ADDR addr; | |
1050 | ||
1051 | if (!value_must_coerce_to_target (val)) | |
1052 | return val; | |
1053 | ||
1054 | length = TYPE_LENGTH (check_typedef (value_type (val))); | |
1055 | addr = allocate_space_in_inferior (length); | |
1056 | write_memory (addr, value_contents (val), length); | |
1057 | return value_at_lazy (value_type (val), addr); | |
1058 | } | |
1059 | ||
ac3eeb49 MS |
1060 | /* Given a value which is an array, return a value which is a pointer |
1061 | to its first element, regardless of whether or not the array has a | |
1062 | nonzero lower bound. | |
c906108c | 1063 | |
ac3eeb49 MS |
1064 | FIXME: A previous comment here indicated that this routine should |
1065 | be substracting the array's lower bound. It's not clear to me that | |
1066 | this is correct. Given an array subscripting operation, it would | |
1067 | certainly work to do the adjustment here, essentially computing: | |
c906108c SS |
1068 | |
1069 | (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0]) | |
1070 | ||
ac3eeb49 MS |
1071 | However I believe a more appropriate and logical place to account |
1072 | for the lower bound is to do so in value_subscript, essentially | |
1073 | computing: | |
c906108c SS |
1074 | |
1075 | (&array[0] + ((index - lowerbound) * sizeof array[0])) | |
1076 | ||
ac3eeb49 MS |
1077 | As further evidence consider what would happen with operations |
1078 | other than array subscripting, where the caller would get back a | |
1079 | value that had an address somewhere before the actual first element | |
1080 | of the array, and the information about the lower bound would be | |
1081 | lost because of the coercion to pointer type. | |
c5aa993b | 1082 | */ |
c906108c | 1083 | |
f23631e4 AC |
1084 | struct value * |
1085 | value_coerce_array (struct value *arg1) | |
c906108c | 1086 | { |
df407dfe | 1087 | struct type *type = check_typedef (value_type (arg1)); |
c906108c | 1088 | |
63092375 DJ |
1089 | /* If the user tries to do something requiring a pointer with an |
1090 | array that has not yet been pushed to the target, then this would | |
1091 | be a good time to do so. */ | |
1092 | arg1 = value_coerce_to_target (arg1); | |
1093 | ||
c906108c | 1094 | if (VALUE_LVAL (arg1) != lval_memory) |
8a3fe4f8 | 1095 | error (_("Attempt to take address of value not located in memory.")); |
c906108c | 1096 | |
4478b372 | 1097 | return value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)), |
df407dfe | 1098 | (VALUE_ADDRESS (arg1) + value_offset (arg1))); |
c906108c SS |
1099 | } |
1100 | ||
1101 | /* Given a value which is a function, return a value which is a pointer | |
1102 | to it. */ | |
1103 | ||
f23631e4 AC |
1104 | struct value * |
1105 | value_coerce_function (struct value *arg1) | |
c906108c | 1106 | { |
f23631e4 | 1107 | struct value *retval; |
c906108c SS |
1108 | |
1109 | if (VALUE_LVAL (arg1) != lval_memory) | |
8a3fe4f8 | 1110 | error (_("Attempt to take address of value not located in memory.")); |
c906108c | 1111 | |
df407dfe AC |
1112 | retval = value_from_pointer (lookup_pointer_type (value_type (arg1)), |
1113 | (VALUE_ADDRESS (arg1) + value_offset (arg1))); | |
c906108c | 1114 | return retval; |
c5aa993b | 1115 | } |
c906108c | 1116 | |
ac3eeb49 MS |
1117 | /* Return a pointer value for the object for which ARG1 is the |
1118 | contents. */ | |
c906108c | 1119 | |
f23631e4 AC |
1120 | struct value * |
1121 | value_addr (struct value *arg1) | |
c906108c | 1122 | { |
f23631e4 | 1123 | struct value *arg2; |
c906108c | 1124 | |
df407dfe | 1125 | struct type *type = check_typedef (value_type (arg1)); |
c906108c SS |
1126 | if (TYPE_CODE (type) == TYPE_CODE_REF) |
1127 | { | |
ac3eeb49 MS |
1128 | /* Copy the value, but change the type from (T&) to (T*). We |
1129 | keep the same location information, which is efficient, and | |
1130 | allows &(&X) to get the location containing the reference. */ | |
c906108c | 1131 | arg2 = value_copy (arg1); |
ac3eeb49 MS |
1132 | deprecated_set_value_type (arg2, |
1133 | lookup_pointer_type (TYPE_TARGET_TYPE (type))); | |
c906108c SS |
1134 | return arg2; |
1135 | } | |
1136 | if (TYPE_CODE (type) == TYPE_CODE_FUNC) | |
1137 | return value_coerce_function (arg1); | |
1138 | ||
63092375 DJ |
1139 | /* If this is an array that has not yet been pushed to the target, |
1140 | then this would be a good time to force it to memory. */ | |
1141 | arg1 = value_coerce_to_target (arg1); | |
1142 | ||
c906108c | 1143 | if (VALUE_LVAL (arg1) != lval_memory) |
8a3fe4f8 | 1144 | error (_("Attempt to take address of value not located in memory.")); |
c906108c | 1145 | |
c5aa993b | 1146 | /* Get target memory address */ |
df407dfe | 1147 | arg2 = value_from_pointer (lookup_pointer_type (value_type (arg1)), |
4478b372 | 1148 | (VALUE_ADDRESS (arg1) |
df407dfe | 1149 | + value_offset (arg1) |
13c3b5f5 | 1150 | + value_embedded_offset (arg1))); |
c906108c SS |
1151 | |
1152 | /* This may be a pointer to a base subobject; so remember the | |
ac3eeb49 | 1153 | full derived object's type ... */ |
4754a64e | 1154 | arg2 = value_change_enclosing_type (arg2, lookup_pointer_type (value_enclosing_type (arg1))); |
ac3eeb49 MS |
1155 | /* ... and also the relative position of the subobject in the full |
1156 | object. */ | |
b44d461b | 1157 | set_value_pointed_to_offset (arg2, value_embedded_offset (arg1)); |
c906108c SS |
1158 | return arg2; |
1159 | } | |
1160 | ||
ac3eeb49 MS |
1161 | /* Return a reference value for the object for which ARG1 is the |
1162 | contents. */ | |
fb933624 DJ |
1163 | |
1164 | struct value * | |
1165 | value_ref (struct value *arg1) | |
1166 | { | |
1167 | struct value *arg2; | |
1168 | ||
1169 | struct type *type = check_typedef (value_type (arg1)); | |
1170 | if (TYPE_CODE (type) == TYPE_CODE_REF) | |
1171 | return arg1; | |
1172 | ||
1173 | arg2 = value_addr (arg1); | |
1174 | deprecated_set_value_type (arg2, lookup_reference_type (type)); | |
1175 | return arg2; | |
1176 | } | |
1177 | ||
ac3eeb49 MS |
1178 | /* Given a value of a pointer type, apply the C unary * operator to |
1179 | it. */ | |
c906108c | 1180 | |
f23631e4 AC |
1181 | struct value * |
1182 | value_ind (struct value *arg1) | |
c906108c SS |
1183 | { |
1184 | struct type *base_type; | |
f23631e4 | 1185 | struct value *arg2; |
c906108c | 1186 | |
994b9211 | 1187 | arg1 = coerce_array (arg1); |
c906108c | 1188 | |
df407dfe | 1189 | base_type = check_typedef (value_type (arg1)); |
c906108c | 1190 | |
22fe0fbb | 1191 | if (TYPE_CODE (base_type) == TYPE_CODE_PTR) |
c906108c SS |
1192 | { |
1193 | struct type *enc_type; | |
ac3eeb49 MS |
1194 | /* We may be pointing to something embedded in a larger object. |
1195 | Get the real type of the enclosing object. */ | |
4754a64e | 1196 | enc_type = check_typedef (value_enclosing_type (arg1)); |
c906108c | 1197 | enc_type = TYPE_TARGET_TYPE (enc_type); |
0d5de010 DJ |
1198 | |
1199 | if (TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_FUNC | |
1200 | || TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_METHOD) | |
1201 | /* For functions, go through find_function_addr, which knows | |
1202 | how to handle function descriptors. */ | |
ac3eeb49 MS |
1203 | arg2 = value_at_lazy (enc_type, |
1204 | find_function_addr (arg1, NULL)); | |
0d5de010 DJ |
1205 | else |
1206 | /* Retrieve the enclosing object pointed to */ | |
ac3eeb49 MS |
1207 | arg2 = value_at_lazy (enc_type, |
1208 | (value_as_address (arg1) | |
1209 | - value_pointed_to_offset (arg1))); | |
0d5de010 | 1210 | |
ac3eeb49 | 1211 | /* Re-adjust type. */ |
04624583 | 1212 | deprecated_set_value_type (arg2, TYPE_TARGET_TYPE (base_type)); |
ac3eeb49 | 1213 | /* Add embedding info. */ |
2b127877 | 1214 | arg2 = value_change_enclosing_type (arg2, enc_type); |
b44d461b | 1215 | set_value_embedded_offset (arg2, value_pointed_to_offset (arg1)); |
c906108c | 1216 | |
ac3eeb49 | 1217 | /* We may be pointing to an object of some derived type. */ |
c906108c SS |
1218 | arg2 = value_full_object (arg2, NULL, 0, 0, 0); |
1219 | return arg2; | |
1220 | } | |
1221 | ||
8a3fe4f8 | 1222 | error (_("Attempt to take contents of a non-pointer value.")); |
ac3eeb49 | 1223 | return 0; /* For lint -- never reached. */ |
c906108c SS |
1224 | } |
1225 | \f | |
63092375 | 1226 | /* Create a value for an array by allocating space in GDB, copying |
ac3eeb49 MS |
1227 | copying the data into that space, and then setting up an array |
1228 | value. | |
c906108c | 1229 | |
ac3eeb49 MS |
1230 | The array bounds are set from LOWBOUND and HIGHBOUND, and the array |
1231 | is populated from the values passed in ELEMVEC. | |
c906108c SS |
1232 | |
1233 | The element type of the array is inherited from the type of the | |
1234 | first element, and all elements must have the same size (though we | |
ac3eeb49 | 1235 | don't currently enforce any restriction on their types). */ |
c906108c | 1236 | |
f23631e4 AC |
1237 | struct value * |
1238 | value_array (int lowbound, int highbound, struct value **elemvec) | |
c906108c SS |
1239 | { |
1240 | int nelem; | |
1241 | int idx; | |
1242 | unsigned int typelength; | |
f23631e4 | 1243 | struct value *val; |
c906108c SS |
1244 | struct type *rangetype; |
1245 | struct type *arraytype; | |
1246 | CORE_ADDR addr; | |
1247 | ||
ac3eeb49 MS |
1248 | /* Validate that the bounds are reasonable and that each of the |
1249 | elements have the same size. */ | |
c906108c SS |
1250 | |
1251 | nelem = highbound - lowbound + 1; | |
1252 | if (nelem <= 0) | |
1253 | { | |
8a3fe4f8 | 1254 | error (_("bad array bounds (%d, %d)"), lowbound, highbound); |
c906108c | 1255 | } |
4754a64e | 1256 | typelength = TYPE_LENGTH (value_enclosing_type (elemvec[0])); |
c906108c SS |
1257 | for (idx = 1; idx < nelem; idx++) |
1258 | { | |
4754a64e | 1259 | if (TYPE_LENGTH (value_enclosing_type (elemvec[idx])) != typelength) |
c906108c | 1260 | { |
8a3fe4f8 | 1261 | error (_("array elements must all be the same size")); |
c906108c SS |
1262 | } |
1263 | } | |
1264 | ||
ac3eeb49 | 1265 | rangetype = create_range_type ((struct type *) NULL, |
6d84d3d8 | 1266 | builtin_type_int32, |
c906108c | 1267 | lowbound, highbound); |
c5aa993b | 1268 | arraytype = create_array_type ((struct type *) NULL, |
ac3eeb49 MS |
1269 | value_enclosing_type (elemvec[0]), |
1270 | rangetype); | |
c906108c SS |
1271 | |
1272 | if (!current_language->c_style_arrays) | |
1273 | { | |
1274 | val = allocate_value (arraytype); | |
1275 | for (idx = 0; idx < nelem; idx++) | |
1276 | { | |
990a07ab | 1277 | memcpy (value_contents_all_raw (val) + (idx * typelength), |
46615f07 | 1278 | value_contents_all (elemvec[idx]), |
c906108c SS |
1279 | typelength); |
1280 | } | |
c906108c SS |
1281 | return val; |
1282 | } | |
1283 | ||
63092375 DJ |
1284 | /* Allocate space to store the array, and then initialize it by |
1285 | copying in each element. */ | |
c906108c | 1286 | |
63092375 | 1287 | val = allocate_value (arraytype); |
c906108c | 1288 | for (idx = 0; idx < nelem; idx++) |
63092375 DJ |
1289 | memcpy (value_contents_writeable (val) + (idx * typelength), |
1290 | value_contents_all (elemvec[idx]), | |
1291 | typelength); | |
1292 | return val; | |
c906108c SS |
1293 | } |
1294 | ||
ac3eeb49 MS |
1295 | /* Create a value for a string constant by allocating space in the |
1296 | inferior, copying the data into that space, and returning the | |
1297 | address with type TYPE_CODE_STRING. PTR points to the string | |
1298 | constant data; LEN is number of characters. | |
1299 | ||
1300 | Note that string types are like array of char types with a lower | |
1301 | bound of zero and an upper bound of LEN - 1. Also note that the | |
1302 | string may contain embedded null bytes. */ | |
c906108c | 1303 | |
f23631e4 | 1304 | struct value * |
fba45db2 | 1305 | value_string (char *ptr, int len) |
c906108c | 1306 | { |
f23631e4 | 1307 | struct value *val; |
c906108c SS |
1308 | int lowbound = current_language->string_lower_bound; |
1309 | struct type *rangetype = create_range_type ((struct type *) NULL, | |
6d84d3d8 | 1310 | builtin_type_int32, |
ac3eeb49 MS |
1311 | lowbound, |
1312 | len + lowbound - 1); | |
c906108c | 1313 | struct type *stringtype |
ac3eeb49 | 1314 | = create_string_type ((struct type *) NULL, rangetype); |
c906108c SS |
1315 | CORE_ADDR addr; |
1316 | ||
1317 | if (current_language->c_style_arrays == 0) | |
1318 | { | |
1319 | val = allocate_value (stringtype); | |
990a07ab | 1320 | memcpy (value_contents_raw (val), ptr, len); |
c906108c SS |
1321 | return val; |
1322 | } | |
1323 | ||
1324 | ||
ac3eeb49 MS |
1325 | /* Allocate space to store the string in the inferior, and then copy |
1326 | LEN bytes from PTR in gdb to that address in the inferior. */ | |
c906108c SS |
1327 | |
1328 | addr = allocate_space_in_inferior (len); | |
47b667de | 1329 | write_memory (addr, (gdb_byte *) ptr, len); |
c906108c | 1330 | |
00a4c844 | 1331 | val = value_at_lazy (stringtype, addr); |
c906108c SS |
1332 | return (val); |
1333 | } | |
1334 | ||
f23631e4 | 1335 | struct value * |
fba45db2 | 1336 | value_bitstring (char *ptr, int len) |
c906108c | 1337 | { |
f23631e4 | 1338 | struct value *val; |
ac3eeb49 | 1339 | struct type *domain_type = create_range_type (NULL, |
6d84d3d8 | 1340 | builtin_type_int32, |
c906108c | 1341 | 0, len - 1); |
ac3eeb49 MS |
1342 | struct type *type = create_set_type ((struct type *) NULL, |
1343 | domain_type); | |
c906108c SS |
1344 | TYPE_CODE (type) = TYPE_CODE_BITSTRING; |
1345 | val = allocate_value (type); | |
990a07ab | 1346 | memcpy (value_contents_raw (val), ptr, TYPE_LENGTH (type)); |
c906108c SS |
1347 | return val; |
1348 | } | |
1349 | \f | |
ac3eeb49 MS |
1350 | /* See if we can pass arguments in T2 to a function which takes |
1351 | arguments of types T1. T1 is a list of NARGS arguments, and T2 is | |
1352 | a NULL-terminated vector. If some arguments need coercion of some | |
1353 | sort, then the coerced values are written into T2. Return value is | |
1354 | 0 if the arguments could be matched, or the position at which they | |
1355 | differ if not. | |
c906108c | 1356 | |
ac3eeb49 MS |
1357 | STATICP is nonzero if the T1 argument list came from a static |
1358 | member function. T2 will still include the ``this'' pointer, but | |
1359 | it will be skipped. | |
c906108c SS |
1360 | |
1361 | For non-static member functions, we ignore the first argument, | |
ac3eeb49 MS |
1362 | which is the type of the instance variable. This is because we |
1363 | want to handle calls with objects from derived classes. This is | |
1364 | not entirely correct: we should actually check to make sure that a | |
c906108c SS |
1365 | requested operation is type secure, shouldn't we? FIXME. */ |
1366 | ||
1367 | static int | |
ad2f7632 DJ |
1368 | typecmp (int staticp, int varargs, int nargs, |
1369 | struct field t1[], struct value *t2[]) | |
c906108c SS |
1370 | { |
1371 | int i; | |
1372 | ||
1373 | if (t2 == 0) | |
ac3eeb49 MS |
1374 | internal_error (__FILE__, __LINE__, |
1375 | _("typecmp: no argument list")); | |
ad2f7632 | 1376 | |
ac3eeb49 MS |
1377 | /* Skip ``this'' argument if applicable. T2 will always include |
1378 | THIS. */ | |
4a1970e4 | 1379 | if (staticp) |
ad2f7632 DJ |
1380 | t2 ++; |
1381 | ||
1382 | for (i = 0; | |
1383 | (i < nargs) && TYPE_CODE (t1[i].type) != TYPE_CODE_VOID; | |
1384 | i++) | |
c906108c | 1385 | { |
c5aa993b | 1386 | struct type *tt1, *tt2; |
ad2f7632 | 1387 | |
c5aa993b JM |
1388 | if (!t2[i]) |
1389 | return i + 1; | |
ad2f7632 DJ |
1390 | |
1391 | tt1 = check_typedef (t1[i].type); | |
df407dfe | 1392 | tt2 = check_typedef (value_type (t2[i])); |
ad2f7632 | 1393 | |
c906108c | 1394 | if (TYPE_CODE (tt1) == TYPE_CODE_REF |
c5aa993b | 1395 | /* We should be doing hairy argument matching, as below. */ |
c906108c SS |
1396 | && (TYPE_CODE (check_typedef (TYPE_TARGET_TYPE (tt1))) == TYPE_CODE (tt2))) |
1397 | { | |
1398 | if (TYPE_CODE (tt2) == TYPE_CODE_ARRAY) | |
1399 | t2[i] = value_coerce_array (t2[i]); | |
1400 | else | |
fb933624 | 1401 | t2[i] = value_ref (t2[i]); |
c906108c SS |
1402 | continue; |
1403 | } | |
1404 | ||
802db21b DB |
1405 | /* djb - 20000715 - Until the new type structure is in the |
1406 | place, and we can attempt things like implicit conversions, | |
1407 | we need to do this so you can take something like a map<const | |
1408 | char *>, and properly access map["hello"], because the | |
1409 | argument to [] will be a reference to a pointer to a char, | |
ac3eeb49 MS |
1410 | and the argument will be a pointer to a char. */ |
1411 | while (TYPE_CODE(tt1) == TYPE_CODE_REF | |
1412 | || TYPE_CODE (tt1) == TYPE_CODE_PTR) | |
802db21b DB |
1413 | { |
1414 | tt1 = check_typedef( TYPE_TARGET_TYPE(tt1) ); | |
1415 | } | |
ac3eeb49 MS |
1416 | while (TYPE_CODE(tt2) == TYPE_CODE_ARRAY |
1417 | || TYPE_CODE(tt2) == TYPE_CODE_PTR | |
1418 | || TYPE_CODE(tt2) == TYPE_CODE_REF) | |
c906108c | 1419 | { |
ac3eeb49 | 1420 | tt2 = check_typedef (TYPE_TARGET_TYPE(tt2)); |
c906108c | 1421 | } |
c5aa993b JM |
1422 | if (TYPE_CODE (tt1) == TYPE_CODE (tt2)) |
1423 | continue; | |
ac3eeb49 MS |
1424 | /* Array to pointer is a `trivial conversion' according to the |
1425 | ARM. */ | |
c906108c | 1426 | |
ac3eeb49 MS |
1427 | /* We should be doing much hairier argument matching (see |
1428 | section 13.2 of the ARM), but as a quick kludge, just check | |
1429 | for the same type code. */ | |
df407dfe | 1430 | if (TYPE_CODE (t1[i].type) != TYPE_CODE (value_type (t2[i]))) |
c5aa993b | 1431 | return i + 1; |
c906108c | 1432 | } |
ad2f7632 | 1433 | if (varargs || t2[i] == NULL) |
c5aa993b | 1434 | return 0; |
ad2f7632 | 1435 | return i + 1; |
c906108c SS |
1436 | } |
1437 | ||
ac3eeb49 MS |
1438 | /* Helper function used by value_struct_elt to recurse through |
1439 | baseclasses. Look for a field NAME in ARG1. Adjust the address of | |
1440 | ARG1 by OFFSET bytes, and search in it assuming it has (class) type | |
1441 | TYPE. If found, return value, else return NULL. | |
c906108c | 1442 | |
ac3eeb49 MS |
1443 | If LOOKING_FOR_BASECLASS, then instead of looking for struct |
1444 | fields, look for a baseclass named NAME. */ | |
c906108c | 1445 | |
f23631e4 AC |
1446 | static struct value * |
1447 | search_struct_field (char *name, struct value *arg1, int offset, | |
aa1ee363 | 1448 | struct type *type, int looking_for_baseclass) |
c906108c SS |
1449 | { |
1450 | int i; | |
1451 | int nbases = TYPE_N_BASECLASSES (type); | |
1452 | ||
1453 | CHECK_TYPEDEF (type); | |
1454 | ||
c5aa993b | 1455 | if (!looking_for_baseclass) |
c906108c SS |
1456 | for (i = TYPE_NFIELDS (type) - 1; i >= nbases; i--) |
1457 | { | |
1458 | char *t_field_name = TYPE_FIELD_NAME (type, i); | |
1459 | ||
db577aea | 1460 | if (t_field_name && (strcmp_iw (t_field_name, name) == 0)) |
c906108c | 1461 | { |
f23631e4 | 1462 | struct value *v; |
d6a843b5 | 1463 | if (field_is_static (&TYPE_FIELD (type, i))) |
2c2738a0 DC |
1464 | { |
1465 | v = value_static_field (type, i); | |
1466 | if (v == 0) | |
8a3fe4f8 | 1467 | error (_("field %s is nonexistent or has been optimised out"), |
2c2738a0 DC |
1468 | name); |
1469 | } | |
c906108c | 1470 | else |
2c2738a0 DC |
1471 | { |
1472 | v = value_primitive_field (arg1, offset, i, type); | |
1473 | if (v == 0) | |
8a3fe4f8 | 1474 | error (_("there is no field named %s"), name); |
2c2738a0 | 1475 | } |
c906108c SS |
1476 | return v; |
1477 | } | |
1478 | ||
1479 | if (t_field_name | |
1480 | && (t_field_name[0] == '\0' | |
1481 | || (TYPE_CODE (type) == TYPE_CODE_UNION | |
db577aea | 1482 | && (strcmp_iw (t_field_name, "else") == 0)))) |
c906108c SS |
1483 | { |
1484 | struct type *field_type = TYPE_FIELD_TYPE (type, i); | |
1485 | if (TYPE_CODE (field_type) == TYPE_CODE_UNION | |
1486 | || TYPE_CODE (field_type) == TYPE_CODE_STRUCT) | |
1487 | { | |
ac3eeb49 MS |
1488 | /* Look for a match through the fields of an anonymous |
1489 | union, or anonymous struct. C++ provides anonymous | |
1490 | unions. | |
c906108c | 1491 | |
1b831c93 AC |
1492 | In the GNU Chill (now deleted from GDB) |
1493 | implementation of variant record types, each | |
1494 | <alternative field> has an (anonymous) union type, | |
1495 | each member of the union represents a <variant | |
1496 | alternative>. Each <variant alternative> is | |
1497 | represented as a struct, with a member for each | |
1498 | <variant field>. */ | |
c5aa993b | 1499 | |
f23631e4 | 1500 | struct value *v; |
c906108c SS |
1501 | int new_offset = offset; |
1502 | ||
db034ac5 AC |
1503 | /* This is pretty gross. In G++, the offset in an |
1504 | anonymous union is relative to the beginning of the | |
1b831c93 AC |
1505 | enclosing struct. In the GNU Chill (now deleted |
1506 | from GDB) implementation of variant records, the | |
1507 | bitpos is zero in an anonymous union field, so we | |
ac3eeb49 | 1508 | have to add the offset of the union here. */ |
c906108c SS |
1509 | if (TYPE_CODE (field_type) == TYPE_CODE_STRUCT |
1510 | || (TYPE_NFIELDS (field_type) > 0 | |
1511 | && TYPE_FIELD_BITPOS (field_type, 0) == 0)) | |
1512 | new_offset += TYPE_FIELD_BITPOS (type, i) / 8; | |
1513 | ||
ac3eeb49 MS |
1514 | v = search_struct_field (name, arg1, new_offset, |
1515 | field_type, | |
c906108c SS |
1516 | looking_for_baseclass); |
1517 | if (v) | |
1518 | return v; | |
1519 | } | |
1520 | } | |
1521 | } | |
1522 | ||
c5aa993b | 1523 | for (i = 0; i < nbases; i++) |
c906108c | 1524 | { |
f23631e4 | 1525 | struct value *v; |
c906108c | 1526 | struct type *basetype = check_typedef (TYPE_BASECLASS (type, i)); |
ac3eeb49 MS |
1527 | /* If we are looking for baseclasses, this is what we get when |
1528 | we hit them. But it could happen that the base part's member | |
1529 | name is not yet filled in. */ | |
c906108c SS |
1530 | int found_baseclass = (looking_for_baseclass |
1531 | && TYPE_BASECLASS_NAME (type, i) != NULL | |
ac3eeb49 MS |
1532 | && (strcmp_iw (name, |
1533 | TYPE_BASECLASS_NAME (type, | |
1534 | i)) == 0)); | |
c906108c SS |
1535 | |
1536 | if (BASETYPE_VIA_VIRTUAL (type, i)) | |
1537 | { | |
1538 | int boffset; | |
3e3d7139 | 1539 | struct value *v2; |
c906108c SS |
1540 | |
1541 | boffset = baseclass_offset (type, i, | |
0fd88904 | 1542 | value_contents (arg1) + offset, |
c906108c | 1543 | VALUE_ADDRESS (arg1) |
df407dfe | 1544 | + value_offset (arg1) + offset); |
c906108c | 1545 | if (boffset == -1) |
8a3fe4f8 | 1546 | error (_("virtual baseclass botch")); |
c906108c | 1547 | |
ac3eeb49 MS |
1548 | /* The virtual base class pointer might have been clobbered |
1549 | by the user program. Make sure that it still points to a | |
1550 | valid memory location. */ | |
c906108c SS |
1551 | |
1552 | boffset += offset; | |
1553 | if (boffset < 0 || boffset >= TYPE_LENGTH (type)) | |
1554 | { | |
1555 | CORE_ADDR base_addr; | |
c5aa993b | 1556 | |
3e3d7139 | 1557 | v2 = allocate_value (basetype); |
ac3eeb49 MS |
1558 | base_addr = |
1559 | VALUE_ADDRESS (arg1) + value_offset (arg1) + boffset; | |
1560 | if (target_read_memory (base_addr, | |
1561 | value_contents_raw (v2), | |
c906108c | 1562 | TYPE_LENGTH (basetype)) != 0) |
8a3fe4f8 | 1563 | error (_("virtual baseclass botch")); |
c906108c SS |
1564 | VALUE_LVAL (v2) = lval_memory; |
1565 | VALUE_ADDRESS (v2) = base_addr; | |
1566 | } | |
1567 | else | |
1568 | { | |
3e3d7139 JG |
1569 | if (VALUE_LVAL (arg1) == lval_memory && value_lazy (arg1)) |
1570 | v2 = allocate_value_lazy (basetype); | |
1571 | else | |
1572 | { | |
1573 | v2 = allocate_value (basetype); | |
1574 | memcpy (value_contents_raw (v2), | |
1575 | value_contents_raw (arg1) + boffset, | |
1576 | TYPE_LENGTH (basetype)); | |
1577 | } | |
c906108c SS |
1578 | VALUE_LVAL (v2) = VALUE_LVAL (arg1); |
1579 | VALUE_ADDRESS (v2) = VALUE_ADDRESS (arg1); | |
65d3800a | 1580 | VALUE_FRAME_ID (v2) = VALUE_FRAME_ID (arg1); |
f5cf64a7 | 1581 | set_value_offset (v2, value_offset (arg1) + boffset); |
c906108c SS |
1582 | } |
1583 | ||
1584 | if (found_baseclass) | |
1585 | return v2; | |
ac3eeb49 MS |
1586 | v = search_struct_field (name, v2, 0, |
1587 | TYPE_BASECLASS (type, i), | |
c906108c SS |
1588 | looking_for_baseclass); |
1589 | } | |
1590 | else if (found_baseclass) | |
1591 | v = value_primitive_field (arg1, offset, i, type); | |
1592 | else | |
1593 | v = search_struct_field (name, arg1, | |
ac3eeb49 MS |
1594 | offset + TYPE_BASECLASS_BITPOS (type, |
1595 | i) / 8, | |
c906108c | 1596 | basetype, looking_for_baseclass); |
c5aa993b JM |
1597 | if (v) |
1598 | return v; | |
c906108c SS |
1599 | } |
1600 | return NULL; | |
1601 | } | |
1602 | ||
ac3eeb49 MS |
1603 | /* Helper function used by value_struct_elt to recurse through |
1604 | baseclasses. Look for a field NAME in ARG1. Adjust the address of | |
1605 | ARG1 by OFFSET bytes, and search in it assuming it has (class) type | |
1606 | TYPE. | |
1607 | ||
1608 | If found, return value, else if name matched and args not return | |
1609 | (value) -1, else return NULL. */ | |
c906108c | 1610 | |
f23631e4 AC |
1611 | static struct value * |
1612 | search_struct_method (char *name, struct value **arg1p, | |
1613 | struct value **args, int offset, | |
aa1ee363 | 1614 | int *static_memfuncp, struct type *type) |
c906108c SS |
1615 | { |
1616 | int i; | |
f23631e4 | 1617 | struct value *v; |
c906108c SS |
1618 | int name_matched = 0; |
1619 | char dem_opname[64]; | |
1620 | ||
1621 | CHECK_TYPEDEF (type); | |
1622 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--) | |
1623 | { | |
1624 | char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i); | |
1625 | /* FIXME! May need to check for ARM demangling here */ | |
c5aa993b JM |
1626 | if (strncmp (t_field_name, "__", 2) == 0 || |
1627 | strncmp (t_field_name, "op", 2) == 0 || | |
1628 | strncmp (t_field_name, "type", 4) == 0) | |
c906108c | 1629 | { |
c5aa993b JM |
1630 | if (cplus_demangle_opname (t_field_name, dem_opname, DMGL_ANSI)) |
1631 | t_field_name = dem_opname; | |
1632 | else if (cplus_demangle_opname (t_field_name, dem_opname, 0)) | |
c906108c | 1633 | t_field_name = dem_opname; |
c906108c | 1634 | } |
db577aea | 1635 | if (t_field_name && (strcmp_iw (t_field_name, name) == 0)) |
c906108c SS |
1636 | { |
1637 | int j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1; | |
1638 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i); | |
c5aa993b | 1639 | name_matched = 1; |
c906108c | 1640 | |
de17c821 | 1641 | check_stub_method_group (type, i); |
c906108c | 1642 | if (j > 0 && args == 0) |
8a3fe4f8 | 1643 | error (_("cannot resolve overloaded method `%s': no arguments supplied"), name); |
acf5ed49 | 1644 | else if (j == 0 && args == 0) |
c906108c | 1645 | { |
acf5ed49 DJ |
1646 | v = value_fn_field (arg1p, f, j, type, offset); |
1647 | if (v != NULL) | |
1648 | return v; | |
c906108c | 1649 | } |
acf5ed49 DJ |
1650 | else |
1651 | while (j >= 0) | |
1652 | { | |
acf5ed49 | 1653 | if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j), |
ad2f7632 DJ |
1654 | TYPE_VARARGS (TYPE_FN_FIELD_TYPE (f, j)), |
1655 | TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (f, j)), | |
acf5ed49 DJ |
1656 | TYPE_FN_FIELD_ARGS (f, j), args)) |
1657 | { | |
1658 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) | |
ac3eeb49 MS |
1659 | return value_virtual_fn_field (arg1p, f, j, |
1660 | type, offset); | |
1661 | if (TYPE_FN_FIELD_STATIC_P (f, j) | |
1662 | && static_memfuncp) | |
acf5ed49 DJ |
1663 | *static_memfuncp = 1; |
1664 | v = value_fn_field (arg1p, f, j, type, offset); | |
1665 | if (v != NULL) | |
1666 | return v; | |
1667 | } | |
1668 | j--; | |
1669 | } | |
c906108c SS |
1670 | } |
1671 | } | |
1672 | ||
1673 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) | |
1674 | { | |
1675 | int base_offset; | |
1676 | ||
1677 | if (BASETYPE_VIA_VIRTUAL (type, i)) | |
1678 | { | |
086280be UW |
1679 | struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i)); |
1680 | const gdb_byte *base_valaddr; | |
1681 | ||
1682 | /* The virtual base class pointer might have been | |
1683 | clobbered by the user program. Make sure that it | |
1684 | still points to a valid memory location. */ | |
1685 | ||
1686 | if (offset < 0 || offset >= TYPE_LENGTH (type)) | |
c5aa993b | 1687 | { |
086280be UW |
1688 | gdb_byte *tmp = alloca (TYPE_LENGTH (baseclass)); |
1689 | if (target_read_memory (VALUE_ADDRESS (*arg1p) | |
1690 | + value_offset (*arg1p) + offset, | |
1691 | tmp, TYPE_LENGTH (baseclass)) != 0) | |
1692 | error (_("virtual baseclass botch")); | |
1693 | base_valaddr = tmp; | |
c5aa993b JM |
1694 | } |
1695 | else | |
086280be | 1696 | base_valaddr = value_contents (*arg1p) + offset; |
c5aa993b | 1697 | |
086280be UW |
1698 | base_offset = baseclass_offset (type, i, base_valaddr, |
1699 | VALUE_ADDRESS (*arg1p) | |
1700 | + value_offset (*arg1p) + offset); | |
1701 | if (base_offset == -1) | |
1702 | error (_("virtual baseclass botch")); | |
c5aa993b | 1703 | } |
c906108c SS |
1704 | else |
1705 | { | |
1706 | base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8; | |
c5aa993b | 1707 | } |
c906108c SS |
1708 | v = search_struct_method (name, arg1p, args, base_offset + offset, |
1709 | static_memfuncp, TYPE_BASECLASS (type, i)); | |
f23631e4 | 1710 | if (v == (struct value *) - 1) |
c906108c SS |
1711 | { |
1712 | name_matched = 1; | |
1713 | } | |
1714 | else if (v) | |
1715 | { | |
ac3eeb49 MS |
1716 | /* FIXME-bothner: Why is this commented out? Why is it here? */ |
1717 | /* *arg1p = arg1_tmp; */ | |
c906108c | 1718 | return v; |
c5aa993b | 1719 | } |
c906108c | 1720 | } |
c5aa993b | 1721 | if (name_matched) |
f23631e4 | 1722 | return (struct value *) - 1; |
c5aa993b JM |
1723 | else |
1724 | return NULL; | |
c906108c SS |
1725 | } |
1726 | ||
1727 | /* Given *ARGP, a value of type (pointer to a)* structure/union, | |
ac3eeb49 MS |
1728 | extract the component named NAME from the ultimate target |
1729 | structure/union and return it as a value with its appropriate type. | |
c906108c SS |
1730 | ERR is used in the error message if *ARGP's type is wrong. |
1731 | ||
1732 | C++: ARGS is a list of argument types to aid in the selection of | |
1733 | an appropriate method. Also, handle derived types. | |
1734 | ||
1735 | STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location | |
1736 | where the truthvalue of whether the function that was resolved was | |
1737 | a static member function or not is stored. | |
1738 | ||
ac3eeb49 MS |
1739 | ERR is an error message to be printed in case the field is not |
1740 | found. */ | |
c906108c | 1741 | |
f23631e4 AC |
1742 | struct value * |
1743 | value_struct_elt (struct value **argp, struct value **args, | |
fba45db2 | 1744 | char *name, int *static_memfuncp, char *err) |
c906108c | 1745 | { |
52f0bd74 | 1746 | struct type *t; |
f23631e4 | 1747 | struct value *v; |
c906108c | 1748 | |
994b9211 | 1749 | *argp = coerce_array (*argp); |
c906108c | 1750 | |
df407dfe | 1751 | t = check_typedef (value_type (*argp)); |
c906108c SS |
1752 | |
1753 | /* Follow pointers until we get to a non-pointer. */ | |
1754 | ||
1755 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF) | |
1756 | { | |
1757 | *argp = value_ind (*argp); | |
1758 | /* Don't coerce fn pointer to fn and then back again! */ | |
df407dfe | 1759 | if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC) |
994b9211 | 1760 | *argp = coerce_array (*argp); |
df407dfe | 1761 | t = check_typedef (value_type (*argp)); |
c906108c SS |
1762 | } |
1763 | ||
c5aa993b | 1764 | if (TYPE_CODE (t) != TYPE_CODE_STRUCT |
c906108c | 1765 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
8a3fe4f8 | 1766 | error (_("Attempt to extract a component of a value that is not a %s."), err); |
c906108c SS |
1767 | |
1768 | /* Assume it's not, unless we see that it is. */ | |
1769 | if (static_memfuncp) | |
c5aa993b | 1770 | *static_memfuncp = 0; |
c906108c SS |
1771 | |
1772 | if (!args) | |
1773 | { | |
1774 | /* if there are no arguments ...do this... */ | |
1775 | ||
ac3eeb49 MS |
1776 | /* Try as a field first, because if we succeed, there is less |
1777 | work to be done. */ | |
c906108c SS |
1778 | v = search_struct_field (name, *argp, 0, t, 0); |
1779 | if (v) | |
1780 | return v; | |
1781 | ||
1782 | /* C++: If it was not found as a data field, then try to | |
7b83ea04 | 1783 | return it as a pointer to a method. */ |
c906108c SS |
1784 | |
1785 | if (destructor_name_p (name, t)) | |
8a3fe4f8 | 1786 | error (_("Cannot get value of destructor")); |
c906108c | 1787 | |
ac3eeb49 MS |
1788 | v = search_struct_method (name, argp, args, 0, |
1789 | static_memfuncp, t); | |
c906108c | 1790 | |
f23631e4 | 1791 | if (v == (struct value *) - 1) |
55b39184 | 1792 | error (_("Cannot take address of method %s."), name); |
c906108c SS |
1793 | else if (v == 0) |
1794 | { | |
1795 | if (TYPE_NFN_FIELDS (t)) | |
8a3fe4f8 | 1796 | error (_("There is no member or method named %s."), name); |
c906108c | 1797 | else |
8a3fe4f8 | 1798 | error (_("There is no member named %s."), name); |
c906108c SS |
1799 | } |
1800 | return v; | |
1801 | } | |
1802 | ||
1803 | if (destructor_name_p (name, t)) | |
1804 | { | |
1805 | if (!args[1]) | |
1806 | { | |
1807 | /* Destructors are a special case. */ | |
1808 | int m_index, f_index; | |
1809 | ||
1810 | v = NULL; | |
1811 | if (get_destructor_fn_field (t, &m_index, &f_index)) | |
1812 | { | |
ac3eeb49 MS |
1813 | v = value_fn_field (NULL, |
1814 | TYPE_FN_FIELDLIST1 (t, m_index), | |
c906108c SS |
1815 | f_index, NULL, 0); |
1816 | } | |
1817 | if (v == NULL) | |
ac3eeb49 MS |
1818 | error (_("could not find destructor function named %s."), |
1819 | name); | |
c906108c SS |
1820 | else |
1821 | return v; | |
1822 | } | |
1823 | else | |
1824 | { | |
8a3fe4f8 | 1825 | error (_("destructor should not have any argument")); |
c906108c SS |
1826 | } |
1827 | } | |
1828 | else | |
ac3eeb49 MS |
1829 | v = search_struct_method (name, argp, args, 0, |
1830 | static_memfuncp, t); | |
7168a814 | 1831 | |
f23631e4 | 1832 | if (v == (struct value *) - 1) |
c906108c | 1833 | { |
8a3fe4f8 | 1834 | error (_("One of the arguments you tried to pass to %s could not be converted to what the function wants."), name); |
c906108c SS |
1835 | } |
1836 | else if (v == 0) | |
1837 | { | |
ac3eeb49 MS |
1838 | /* See if user tried to invoke data as function. If so, hand it |
1839 | back. If it's not callable (i.e., a pointer to function), | |
7b83ea04 | 1840 | gdb should give an error. */ |
c906108c | 1841 | v = search_struct_field (name, *argp, 0, t, 0); |
fa8de41e TT |
1842 | /* If we found an ordinary field, then it is not a method call. |
1843 | So, treat it as if it were a static member function. */ | |
1844 | if (v && static_memfuncp) | |
1845 | *static_memfuncp = 1; | |
c906108c SS |
1846 | } |
1847 | ||
1848 | if (!v) | |
8a3fe4f8 | 1849 | error (_("Structure has no component named %s."), name); |
c906108c SS |
1850 | return v; |
1851 | } | |
1852 | ||
ac3eeb49 | 1853 | /* Search through the methods of an object (and its bases) to find a |
cfe9eade | 1854 | specified method. Return the pointer to the fn_field list of |
ac3eeb49 MS |
1855 | overloaded instances. |
1856 | ||
1857 | Helper function for value_find_oload_list. | |
1858 | ARGP is a pointer to a pointer to a value (the object). | |
1859 | METHOD is a string containing the method name. | |
1860 | OFFSET is the offset within the value. | |
1861 | TYPE is the assumed type of the object. | |
1862 | NUM_FNS is the number of overloaded instances. | |
1863 | BASETYPE is set to the actual type of the subobject where the | |
1864 | method is found. | |
1865 | BOFFSET is the offset of the base subobject where the method is found. | |
1866 | */ | |
c906108c | 1867 | |
7a292a7a | 1868 | static struct fn_field * |
ac3eeb49 MS |
1869 | find_method_list (struct value **argp, char *method, |
1870 | int offset, struct type *type, int *num_fns, | |
fba45db2 | 1871 | struct type **basetype, int *boffset) |
c906108c SS |
1872 | { |
1873 | int i; | |
c5aa993b | 1874 | struct fn_field *f; |
c906108c SS |
1875 | CHECK_TYPEDEF (type); |
1876 | ||
1877 | *num_fns = 0; | |
1878 | ||
ac3eeb49 | 1879 | /* First check in object itself. */ |
c5aa993b | 1880 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--) |
c906108c | 1881 | { |
ac3eeb49 | 1882 | /* pai: FIXME What about operators and type conversions? */ |
c5aa993b | 1883 | char *fn_field_name = TYPE_FN_FIELDLIST_NAME (type, i); |
db577aea | 1884 | if (fn_field_name && (strcmp_iw (fn_field_name, method) == 0)) |
c5aa993b | 1885 | { |
4a1970e4 DJ |
1886 | int len = TYPE_FN_FIELDLIST_LENGTH (type, i); |
1887 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i); | |
4a1970e4 DJ |
1888 | |
1889 | *num_fns = len; | |
c5aa993b JM |
1890 | *basetype = type; |
1891 | *boffset = offset; | |
4a1970e4 | 1892 | |
de17c821 DJ |
1893 | /* Resolve any stub methods. */ |
1894 | check_stub_method_group (type, i); | |
4a1970e4 DJ |
1895 | |
1896 | return f; | |
c5aa993b JM |
1897 | } |
1898 | } | |
1899 | ||
ac3eeb49 | 1900 | /* Not found in object, check in base subobjects. */ |
c906108c SS |
1901 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
1902 | { | |
1903 | int base_offset; | |
1904 | if (BASETYPE_VIA_VIRTUAL (type, i)) | |
1905 | { | |
086280be UW |
1906 | base_offset = value_offset (*argp) + offset; |
1907 | base_offset = baseclass_offset (type, i, | |
1908 | value_contents (*argp) + base_offset, | |
1909 | VALUE_ADDRESS (*argp) + base_offset); | |
1910 | if (base_offset == -1) | |
1911 | error (_("virtual baseclass botch")); | |
c5aa993b | 1912 | } |
ac3eeb49 MS |
1913 | else /* Non-virtual base, simply use bit position from debug |
1914 | info. */ | |
c906108c SS |
1915 | { |
1916 | base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8; | |
c5aa993b | 1917 | } |
c906108c | 1918 | f = find_method_list (argp, method, base_offset + offset, |
ac3eeb49 MS |
1919 | TYPE_BASECLASS (type, i), num_fns, |
1920 | basetype, boffset); | |
c906108c | 1921 | if (f) |
c5aa993b | 1922 | return f; |
c906108c | 1923 | } |
c5aa993b | 1924 | return NULL; |
c906108c SS |
1925 | } |
1926 | ||
1927 | /* Return the list of overloaded methods of a specified name. | |
ac3eeb49 MS |
1928 | |
1929 | ARGP is a pointer to a pointer to a value (the object). | |
1930 | METHOD is the method name. | |
1931 | OFFSET is the offset within the value contents. | |
1932 | NUM_FNS is the number of overloaded instances. | |
1933 | BASETYPE is set to the type of the base subobject that defines the | |
1934 | method. | |
1935 | BOFFSET is the offset of the base subobject which defines the method. | |
1936 | */ | |
c906108c SS |
1937 | |
1938 | struct fn_field * | |
ac3eeb49 MS |
1939 | value_find_oload_method_list (struct value **argp, char *method, |
1940 | int offset, int *num_fns, | |
1941 | struct type **basetype, int *boffset) | |
c906108c | 1942 | { |
c5aa993b | 1943 | struct type *t; |
c906108c | 1944 | |
df407dfe | 1945 | t = check_typedef (value_type (*argp)); |
c906108c | 1946 | |
ac3eeb49 | 1947 | /* Code snarfed from value_struct_elt. */ |
c906108c SS |
1948 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF) |
1949 | { | |
1950 | *argp = value_ind (*argp); | |
1951 | /* Don't coerce fn pointer to fn and then back again! */ | |
df407dfe | 1952 | if (TYPE_CODE (value_type (*argp)) != TYPE_CODE_FUNC) |
994b9211 | 1953 | *argp = coerce_array (*argp); |
df407dfe | 1954 | t = check_typedef (value_type (*argp)); |
c906108c | 1955 | } |
c5aa993b | 1956 | |
c5aa993b JM |
1957 | if (TYPE_CODE (t) != TYPE_CODE_STRUCT |
1958 | && TYPE_CODE (t) != TYPE_CODE_UNION) | |
8a3fe4f8 | 1959 | error (_("Attempt to extract a component of a value that is not a struct or union")); |
c5aa993b | 1960 | |
ac3eeb49 MS |
1961 | return find_method_list (argp, method, 0, t, num_fns, |
1962 | basetype, boffset); | |
c906108c SS |
1963 | } |
1964 | ||
1965 | /* Given an array of argument types (ARGTYPES) (which includes an | |
1966 | entry for "this" in the case of C++ methods), the number of | |
1967 | arguments NARGS, the NAME of a function whether it's a method or | |
1968 | not (METHOD), and the degree of laxness (LAX) in conforming to | |
1969 | overload resolution rules in ANSI C++, find the best function that | |
1970 | matches on the argument types according to the overload resolution | |
1971 | rules. | |
1972 | ||
1973 | In the case of class methods, the parameter OBJ is an object value | |
1974 | in which to search for overloaded methods. | |
1975 | ||
1976 | In the case of non-method functions, the parameter FSYM is a symbol | |
1977 | corresponding to one of the overloaded functions. | |
1978 | ||
1979 | Return value is an integer: 0 -> good match, 10 -> debugger applied | |
1980 | non-standard coercions, 100 -> incompatible. | |
1981 | ||
1982 | If a method is being searched for, VALP will hold the value. | |
ac3eeb49 MS |
1983 | If a non-method is being searched for, SYMP will hold the symbol |
1984 | for it. | |
c906108c SS |
1985 | |
1986 | If a method is being searched for, and it is a static method, | |
1987 | then STATICP will point to a non-zero value. | |
1988 | ||
1989 | Note: This function does *not* check the value of | |
1990 | overload_resolution. Caller must check it to see whether overload | |
1991 | resolution is permitted. | |
ac3eeb49 | 1992 | */ |
c906108c SS |
1993 | |
1994 | int | |
ac3eeb49 MS |
1995 | find_overload_match (struct type **arg_types, int nargs, |
1996 | char *name, int method, int lax, | |
1997 | struct value **objp, struct symbol *fsym, | |
1998 | struct value **valp, struct symbol **symp, | |
1999 | int *staticp) | |
c906108c | 2000 | { |
7f8c9282 | 2001 | struct value *obj = (objp ? *objp : NULL); |
ac3eeb49 MS |
2002 | /* Index of best overloaded function. */ |
2003 | int oload_champ; | |
2004 | /* The measure for the current best match. */ | |
2005 | struct badness_vector *oload_champ_bv = NULL; | |
f23631e4 | 2006 | struct value *temp = obj; |
ac3eeb49 MS |
2007 | /* For methods, the list of overloaded methods. */ |
2008 | struct fn_field *fns_ptr = NULL; | |
2009 | /* For non-methods, the list of overloaded function symbols. */ | |
2010 | struct symbol **oload_syms = NULL; | |
2011 | /* Number of overloaded instances being considered. */ | |
2012 | int num_fns = 0; | |
c5aa993b | 2013 | struct type *basetype = NULL; |
c906108c | 2014 | int boffset; |
52f0bd74 | 2015 | int ix; |
4a1970e4 | 2016 | int static_offset; |
8d577d32 | 2017 | struct cleanup *old_cleanups = NULL; |
c906108c | 2018 | |
8d577d32 | 2019 | const char *obj_type_name = NULL; |
c5aa993b | 2020 | char *func_name = NULL; |
8d577d32 | 2021 | enum oload_classification match_quality; |
c906108c | 2022 | |
ac3eeb49 | 2023 | /* Get the list of overloaded methods or functions. */ |
c906108c SS |
2024 | if (method) |
2025 | { | |
a2ca50ae | 2026 | gdb_assert (obj); |
df407dfe | 2027 | obj_type_name = TYPE_NAME (value_type (obj)); |
c906108c | 2028 | /* Hack: evaluate_subexp_standard often passes in a pointer |
ac3eeb49 MS |
2029 | value rather than the object itself, so try again. */ |
2030 | if ((!obj_type_name || !*obj_type_name) | |
2031 | && (TYPE_CODE (value_type (obj)) == TYPE_CODE_PTR)) | |
df407dfe | 2032 | obj_type_name = TYPE_NAME (TYPE_TARGET_TYPE (value_type (obj))); |
c906108c | 2033 | |
ac3eeb49 MS |
2034 | fns_ptr = value_find_oload_method_list (&temp, name, |
2035 | 0, &num_fns, | |
c5aa993b | 2036 | &basetype, &boffset); |
c906108c | 2037 | if (!fns_ptr || !num_fns) |
8a3fe4f8 | 2038 | error (_("Couldn't find method %s%s%s"), |
c5aa993b JM |
2039 | obj_type_name, |
2040 | (obj_type_name && *obj_type_name) ? "::" : "", | |
2041 | name); | |
4a1970e4 | 2042 | /* If we are dealing with stub method types, they should have |
ac3eeb49 MS |
2043 | been resolved by find_method_list via |
2044 | value_find_oload_method_list above. */ | |
4a1970e4 | 2045 | gdb_assert (TYPE_DOMAIN_TYPE (fns_ptr[0].type) != NULL); |
ac3eeb49 MS |
2046 | oload_champ = find_oload_champ (arg_types, nargs, method, |
2047 | num_fns, fns_ptr, | |
2048 | oload_syms, &oload_champ_bv); | |
c906108c SS |
2049 | } |
2050 | else | |
2051 | { | |
8d577d32 | 2052 | const char *qualified_name = SYMBOL_CPLUS_DEMANGLED_NAME (fsym); |
c906108c | 2053 | |
d9639e13 DJ |
2054 | /* If we have a C++ name, try to extract just the function |
2055 | part. */ | |
2056 | if (qualified_name) | |
2057 | func_name = cp_func_name (qualified_name); | |
2058 | ||
2059 | /* If there was no C++ name, this must be a C-style function. | |
2060 | Just return the same symbol. Do the same if cp_func_name | |
2061 | fails for some reason. */ | |
8d577d32 | 2062 | if (func_name == NULL) |
7b83ea04 | 2063 | { |
917317f4 | 2064 | *symp = fsym; |
7b83ea04 AC |
2065 | return 0; |
2066 | } | |
917317f4 | 2067 | |
8d577d32 DC |
2068 | old_cleanups = make_cleanup (xfree, func_name); |
2069 | make_cleanup (xfree, oload_syms); | |
2070 | make_cleanup (xfree, oload_champ_bv); | |
2071 | ||
2072 | oload_champ = find_oload_champ_namespace (arg_types, nargs, | |
2073 | func_name, | |
2074 | qualified_name, | |
2075 | &oload_syms, | |
2076 | &oload_champ_bv); | |
2077 | } | |
2078 | ||
2079 | /* Check how bad the best match is. */ | |
2080 | ||
ac3eeb49 MS |
2081 | match_quality = |
2082 | classify_oload_match (oload_champ_bv, nargs, | |
2083 | oload_method_static (method, fns_ptr, | |
2084 | oload_champ)); | |
8d577d32 DC |
2085 | |
2086 | if (match_quality == INCOMPATIBLE) | |
2087 | { | |
2088 | if (method) | |
8a3fe4f8 | 2089 | error (_("Cannot resolve method %s%s%s to any overloaded instance"), |
8d577d32 DC |
2090 | obj_type_name, |
2091 | (obj_type_name && *obj_type_name) ? "::" : "", | |
2092 | name); | |
2093 | else | |
8a3fe4f8 | 2094 | error (_("Cannot resolve function %s to any overloaded instance"), |
8d577d32 DC |
2095 | func_name); |
2096 | } | |
2097 | else if (match_quality == NON_STANDARD) | |
2098 | { | |
2099 | if (method) | |
8a3fe4f8 | 2100 | warning (_("Using non-standard conversion to match method %s%s%s to supplied arguments"), |
8d577d32 DC |
2101 | obj_type_name, |
2102 | (obj_type_name && *obj_type_name) ? "::" : "", | |
2103 | name); | |
2104 | else | |
8a3fe4f8 | 2105 | warning (_("Using non-standard conversion to match function %s to supplied arguments"), |
8d577d32 DC |
2106 | func_name); |
2107 | } | |
2108 | ||
2109 | if (method) | |
2110 | { | |
2111 | if (staticp != NULL) | |
2112 | *staticp = oload_method_static (method, fns_ptr, oload_champ); | |
2113 | if (TYPE_FN_FIELD_VIRTUAL_P (fns_ptr, oload_champ)) | |
ac3eeb49 MS |
2114 | *valp = value_virtual_fn_field (&temp, fns_ptr, oload_champ, |
2115 | basetype, boffset); | |
8d577d32 | 2116 | else |
ac3eeb49 MS |
2117 | *valp = value_fn_field (&temp, fns_ptr, oload_champ, |
2118 | basetype, boffset); | |
8d577d32 DC |
2119 | } |
2120 | else | |
2121 | { | |
2122 | *symp = oload_syms[oload_champ]; | |
2123 | } | |
2124 | ||
2125 | if (objp) | |
2126 | { | |
df407dfe | 2127 | if (TYPE_CODE (value_type (temp)) != TYPE_CODE_PTR |
fed27633 PP |
2128 | && (TYPE_CODE (value_type (*objp)) == TYPE_CODE_PTR |
2129 | || TYPE_CODE (value_type (*objp)) == TYPE_CODE_REF)) | |
8d577d32 DC |
2130 | { |
2131 | temp = value_addr (temp); | |
2132 | } | |
2133 | *objp = temp; | |
2134 | } | |
2135 | if (old_cleanups != NULL) | |
2136 | do_cleanups (old_cleanups); | |
2137 | ||
2138 | switch (match_quality) | |
2139 | { | |
2140 | case INCOMPATIBLE: | |
2141 | return 100; | |
2142 | case NON_STANDARD: | |
2143 | return 10; | |
2144 | default: /* STANDARD */ | |
2145 | return 0; | |
2146 | } | |
2147 | } | |
2148 | ||
2149 | /* Find the best overload match, searching for FUNC_NAME in namespaces | |
2150 | contained in QUALIFIED_NAME until it either finds a good match or | |
2151 | runs out of namespaces. It stores the overloaded functions in | |
2152 | *OLOAD_SYMS, and the badness vector in *OLOAD_CHAMP_BV. The | |
2153 | calling function is responsible for freeing *OLOAD_SYMS and | |
2154 | *OLOAD_CHAMP_BV. */ | |
2155 | ||
2156 | static int | |
2157 | find_oload_champ_namespace (struct type **arg_types, int nargs, | |
2158 | const char *func_name, | |
2159 | const char *qualified_name, | |
2160 | struct symbol ***oload_syms, | |
2161 | struct badness_vector **oload_champ_bv) | |
2162 | { | |
2163 | int oload_champ; | |
2164 | ||
2165 | find_oload_champ_namespace_loop (arg_types, nargs, | |
2166 | func_name, | |
2167 | qualified_name, 0, | |
2168 | oload_syms, oload_champ_bv, | |
2169 | &oload_champ); | |
2170 | ||
2171 | return oload_champ; | |
2172 | } | |
2173 | ||
2174 | /* Helper function for find_oload_champ_namespace; NAMESPACE_LEN is | |
2175 | how deep we've looked for namespaces, and the champ is stored in | |
2176 | OLOAD_CHAMP. The return value is 1 if the champ is a good one, 0 | |
2177 | if it isn't. | |
2178 | ||
2179 | It is the caller's responsibility to free *OLOAD_SYMS and | |
2180 | *OLOAD_CHAMP_BV. */ | |
2181 | ||
2182 | static int | |
2183 | find_oload_champ_namespace_loop (struct type **arg_types, int nargs, | |
2184 | const char *func_name, | |
2185 | const char *qualified_name, | |
2186 | int namespace_len, | |
2187 | struct symbol ***oload_syms, | |
2188 | struct badness_vector **oload_champ_bv, | |
2189 | int *oload_champ) | |
2190 | { | |
2191 | int next_namespace_len = namespace_len; | |
2192 | int searched_deeper = 0; | |
2193 | int num_fns = 0; | |
2194 | struct cleanup *old_cleanups; | |
2195 | int new_oload_champ; | |
2196 | struct symbol **new_oload_syms; | |
2197 | struct badness_vector *new_oload_champ_bv; | |
2198 | char *new_namespace; | |
2199 | ||
2200 | if (next_namespace_len != 0) | |
2201 | { | |
2202 | gdb_assert (qualified_name[next_namespace_len] == ':'); | |
2203 | next_namespace_len += 2; | |
c906108c | 2204 | } |
ac3eeb49 MS |
2205 | next_namespace_len += |
2206 | cp_find_first_component (qualified_name + next_namespace_len); | |
8d577d32 DC |
2207 | |
2208 | /* Initialize these to values that can safely be xfree'd. */ | |
2209 | *oload_syms = NULL; | |
2210 | *oload_champ_bv = NULL; | |
c5aa993b | 2211 | |
ac3eeb49 MS |
2212 | /* First, see if we have a deeper namespace we can search in. |
2213 | If we get a good match there, use it. */ | |
8d577d32 DC |
2214 | |
2215 | if (qualified_name[next_namespace_len] == ':') | |
2216 | { | |
2217 | searched_deeper = 1; | |
2218 | ||
2219 | if (find_oload_champ_namespace_loop (arg_types, nargs, | |
2220 | func_name, qualified_name, | |
2221 | next_namespace_len, | |
2222 | oload_syms, oload_champ_bv, | |
2223 | oload_champ)) | |
2224 | { | |
2225 | return 1; | |
2226 | } | |
2227 | }; | |
2228 | ||
2229 | /* If we reach here, either we're in the deepest namespace or we | |
2230 | didn't find a good match in a deeper namespace. But, in the | |
2231 | latter case, we still have a bad match in a deeper namespace; | |
2232 | note that we might not find any match at all in the current | |
2233 | namespace. (There's always a match in the deepest namespace, | |
2234 | because this overload mechanism only gets called if there's a | |
2235 | function symbol to start off with.) */ | |
2236 | ||
2237 | old_cleanups = make_cleanup (xfree, *oload_syms); | |
2238 | old_cleanups = make_cleanup (xfree, *oload_champ_bv); | |
2239 | new_namespace = alloca (namespace_len + 1); | |
2240 | strncpy (new_namespace, qualified_name, namespace_len); | |
2241 | new_namespace[namespace_len] = '\0'; | |
2242 | new_oload_syms = make_symbol_overload_list (func_name, | |
2243 | new_namespace); | |
2244 | while (new_oload_syms[num_fns]) | |
2245 | ++num_fns; | |
2246 | ||
2247 | new_oload_champ = find_oload_champ (arg_types, nargs, 0, num_fns, | |
2248 | NULL, new_oload_syms, | |
2249 | &new_oload_champ_bv); | |
2250 | ||
2251 | /* Case 1: We found a good match. Free earlier matches (if any), | |
2252 | and return it. Case 2: We didn't find a good match, but we're | |
2253 | not the deepest function. Then go with the bad match that the | |
2254 | deeper function found. Case 3: We found a bad match, and we're | |
2255 | the deepest function. Then return what we found, even though | |
2256 | it's a bad match. */ | |
2257 | ||
2258 | if (new_oload_champ != -1 | |
2259 | && classify_oload_match (new_oload_champ_bv, nargs, 0) == STANDARD) | |
2260 | { | |
2261 | *oload_syms = new_oload_syms; | |
2262 | *oload_champ = new_oload_champ; | |
2263 | *oload_champ_bv = new_oload_champ_bv; | |
2264 | do_cleanups (old_cleanups); | |
2265 | return 1; | |
2266 | } | |
2267 | else if (searched_deeper) | |
2268 | { | |
2269 | xfree (new_oload_syms); | |
2270 | xfree (new_oload_champ_bv); | |
2271 | discard_cleanups (old_cleanups); | |
2272 | return 0; | |
2273 | } | |
2274 | else | |
2275 | { | |
2276 | gdb_assert (new_oload_champ != -1); | |
2277 | *oload_syms = new_oload_syms; | |
2278 | *oload_champ = new_oload_champ; | |
2279 | *oload_champ_bv = new_oload_champ_bv; | |
2280 | discard_cleanups (old_cleanups); | |
2281 | return 0; | |
2282 | } | |
2283 | } | |
2284 | ||
2285 | /* Look for a function to take NARGS args of types ARG_TYPES. Find | |
2286 | the best match from among the overloaded methods or functions | |
2287 | (depending on METHOD) given by FNS_PTR or OLOAD_SYMS, respectively. | |
2288 | The number of methods/functions in the list is given by NUM_FNS. | |
2289 | Return the index of the best match; store an indication of the | |
2290 | quality of the match in OLOAD_CHAMP_BV. | |
2291 | ||
2292 | It is the caller's responsibility to free *OLOAD_CHAMP_BV. */ | |
2293 | ||
2294 | static int | |
2295 | find_oload_champ (struct type **arg_types, int nargs, int method, | |
2296 | int num_fns, struct fn_field *fns_ptr, | |
2297 | struct symbol **oload_syms, | |
2298 | struct badness_vector **oload_champ_bv) | |
2299 | { | |
2300 | int ix; | |
ac3eeb49 MS |
2301 | /* A measure of how good an overloaded instance is. */ |
2302 | struct badness_vector *bv; | |
2303 | /* Index of best overloaded function. */ | |
2304 | int oload_champ = -1; | |
2305 | /* Current ambiguity state for overload resolution. */ | |
2306 | int oload_ambiguous = 0; | |
2307 | /* 0 => no ambiguity, 1 => two good funcs, 2 => incomparable funcs. */ | |
8d577d32 DC |
2308 | |
2309 | *oload_champ_bv = NULL; | |
c906108c | 2310 | |
ac3eeb49 | 2311 | /* Consider each candidate in turn. */ |
c906108c SS |
2312 | for (ix = 0; ix < num_fns; ix++) |
2313 | { | |
8d577d32 DC |
2314 | int jj; |
2315 | int static_offset = oload_method_static (method, fns_ptr, ix); | |
2316 | int nparms; | |
2317 | struct type **parm_types; | |
2318 | ||
db577aea AC |
2319 | if (method) |
2320 | { | |
ad2f7632 | 2321 | nparms = TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (fns_ptr, ix)); |
db577aea AC |
2322 | } |
2323 | else | |
2324 | { | |
ac3eeb49 MS |
2325 | /* If it's not a method, this is the proper place. */ |
2326 | nparms = TYPE_NFIELDS (SYMBOL_TYPE (oload_syms[ix])); | |
db577aea | 2327 | } |
c906108c | 2328 | |
ac3eeb49 MS |
2329 | /* Prepare array of parameter types. */ |
2330 | parm_types = (struct type **) | |
2331 | xmalloc (nparms * (sizeof (struct type *))); | |
c906108c | 2332 | for (jj = 0; jj < nparms; jj++) |
db577aea | 2333 | parm_types[jj] = (method |
ad2f7632 | 2334 | ? (TYPE_FN_FIELD_ARGS (fns_ptr, ix)[jj].type) |
ac3eeb49 MS |
2335 | : TYPE_FIELD_TYPE (SYMBOL_TYPE (oload_syms[ix]), |
2336 | jj)); | |
c906108c | 2337 | |
ac3eeb49 MS |
2338 | /* Compare parameter types to supplied argument types. Skip |
2339 | THIS for static methods. */ | |
2340 | bv = rank_function (parm_types, nparms, | |
2341 | arg_types + static_offset, | |
4a1970e4 | 2342 | nargs - static_offset); |
c5aa993b | 2343 | |
8d577d32 | 2344 | if (!*oload_champ_bv) |
c5aa993b | 2345 | { |
8d577d32 | 2346 | *oload_champ_bv = bv; |
c5aa993b | 2347 | oload_champ = 0; |
c5aa993b | 2348 | } |
ac3eeb49 MS |
2349 | else /* See whether current candidate is better or worse than |
2350 | previous best. */ | |
8d577d32 | 2351 | switch (compare_badness (bv, *oload_champ_bv)) |
c5aa993b | 2352 | { |
ac3eeb49 MS |
2353 | case 0: /* Top two contenders are equally good. */ |
2354 | oload_ambiguous = 1; | |
c5aa993b | 2355 | break; |
ac3eeb49 MS |
2356 | case 1: /* Incomparable top contenders. */ |
2357 | oload_ambiguous = 2; | |
c5aa993b | 2358 | break; |
ac3eeb49 MS |
2359 | case 2: /* New champion, record details. */ |
2360 | *oload_champ_bv = bv; | |
c5aa993b JM |
2361 | oload_ambiguous = 0; |
2362 | oload_champ = ix; | |
c5aa993b JM |
2363 | break; |
2364 | case 3: | |
2365 | default: | |
2366 | break; | |
2367 | } | |
b8c9b27d | 2368 | xfree (parm_types); |
6b1ba9a0 ND |
2369 | if (overload_debug) |
2370 | { | |
2371 | if (method) | |
ac3eeb49 MS |
2372 | fprintf_filtered (gdb_stderr, |
2373 | "Overloaded method instance %s, # of parms %d\n", | |
2374 | fns_ptr[ix].physname, nparms); | |
6b1ba9a0 | 2375 | else |
ac3eeb49 MS |
2376 | fprintf_filtered (gdb_stderr, |
2377 | "Overloaded function instance %s # of parms %d\n", | |
2378 | SYMBOL_DEMANGLED_NAME (oload_syms[ix]), | |
2379 | nparms); | |
4a1970e4 | 2380 | for (jj = 0; jj < nargs - static_offset; jj++) |
ac3eeb49 MS |
2381 | fprintf_filtered (gdb_stderr, |
2382 | "...Badness @ %d : %d\n", | |
2383 | jj, bv->rank[jj]); | |
2384 | fprintf_filtered (gdb_stderr, | |
2385 | "Overload resolution champion is %d, ambiguous? %d\n", | |
2386 | oload_champ, oload_ambiguous); | |
6b1ba9a0 | 2387 | } |
c906108c SS |
2388 | } |
2389 | ||
8d577d32 DC |
2390 | return oload_champ; |
2391 | } | |
6b1ba9a0 | 2392 | |
8d577d32 DC |
2393 | /* Return 1 if we're looking at a static method, 0 if we're looking at |
2394 | a non-static method or a function that isn't a method. */ | |
c906108c | 2395 | |
8d577d32 DC |
2396 | static int |
2397 | oload_method_static (int method, struct fn_field *fns_ptr, int index) | |
2398 | { | |
2399 | if (method && TYPE_FN_FIELD_STATIC_P (fns_ptr, index)) | |
2400 | return 1; | |
c906108c | 2401 | else |
8d577d32 DC |
2402 | return 0; |
2403 | } | |
c906108c | 2404 | |
8d577d32 DC |
2405 | /* Check how good an overload match OLOAD_CHAMP_BV represents. */ |
2406 | ||
2407 | static enum oload_classification | |
2408 | classify_oload_match (struct badness_vector *oload_champ_bv, | |
2409 | int nargs, | |
2410 | int static_offset) | |
2411 | { | |
2412 | int ix; | |
2413 | ||
2414 | for (ix = 1; ix <= nargs - static_offset; ix++) | |
7f8c9282 | 2415 | { |
8d577d32 | 2416 | if (oload_champ_bv->rank[ix] >= 100) |
ac3eeb49 | 2417 | return INCOMPATIBLE; /* Truly mismatched types. */ |
8d577d32 | 2418 | else if (oload_champ_bv->rank[ix] >= 10) |
ac3eeb49 MS |
2419 | return NON_STANDARD; /* Non-standard type conversions |
2420 | needed. */ | |
7f8c9282 | 2421 | } |
02f0d45d | 2422 | |
8d577d32 | 2423 | return STANDARD; /* Only standard conversions needed. */ |
c906108c SS |
2424 | } |
2425 | ||
ac3eeb49 MS |
2426 | /* C++: return 1 is NAME is a legitimate name for the destructor of |
2427 | type TYPE. If TYPE does not have a destructor, or if NAME is | |
2428 | inappropriate for TYPE, an error is signaled. */ | |
c906108c | 2429 | int |
fba45db2 | 2430 | destructor_name_p (const char *name, const struct type *type) |
c906108c | 2431 | { |
ac3eeb49 | 2432 | /* Destructors are a special case. */ |
c906108c SS |
2433 | |
2434 | if (name[0] == '~') | |
2435 | { | |
2436 | char *dname = type_name_no_tag (type); | |
2437 | char *cp = strchr (dname, '<'); | |
2438 | unsigned int len; | |
2439 | ||
2440 | /* Do not compare the template part for template classes. */ | |
2441 | if (cp == NULL) | |
2442 | len = strlen (dname); | |
2443 | else | |
2444 | len = cp - dname; | |
bf896cb0 | 2445 | if (strlen (name + 1) != len || strncmp (dname, name + 1, len) != 0) |
8a3fe4f8 | 2446 | error (_("name of destructor must equal name of class")); |
c906108c SS |
2447 | else |
2448 | return 1; | |
2449 | } | |
2450 | return 0; | |
2451 | } | |
2452 | ||
2b2d9e11 | 2453 | /* Given TYPE, a structure/union, |
ac3eeb49 MS |
2454 | return 1 if the component named NAME from the ultimate target |
2455 | structure/union is defined, otherwise, return 0. */ | |
c906108c | 2456 | |
2b2d9e11 VP |
2457 | int |
2458 | check_field (struct type *type, const char *name) | |
c906108c | 2459 | { |
52f0bd74 | 2460 | int i; |
c906108c SS |
2461 | |
2462 | for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--) | |
2463 | { | |
2464 | char *t_field_name = TYPE_FIELD_NAME (type, i); | |
db577aea | 2465 | if (t_field_name && (strcmp_iw (t_field_name, name) == 0)) |
c906108c SS |
2466 | return 1; |
2467 | } | |
2468 | ||
ac3eeb49 MS |
2469 | /* C++: If it was not found as a data field, then try to return it |
2470 | as a pointer to a method. */ | |
c906108c SS |
2471 | |
2472 | /* Destructors are a special case. */ | |
2473 | if (destructor_name_p (name, type)) | |
2474 | { | |
2475 | int m_index, f_index; | |
2476 | ||
2477 | return get_destructor_fn_field (type, &m_index, &f_index); | |
2478 | } | |
2479 | ||
2480 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i) | |
2481 | { | |
db577aea | 2482 | if (strcmp_iw (TYPE_FN_FIELDLIST_NAME (type, i), name) == 0) |
c906108c SS |
2483 | return 1; |
2484 | } | |
2485 | ||
2486 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) | |
2b2d9e11 | 2487 | if (check_field (TYPE_BASECLASS (type, i), name)) |
c906108c | 2488 | return 1; |
c5aa993b | 2489 | |
c906108c SS |
2490 | return 0; |
2491 | } | |
2492 | ||
79c2c32d | 2493 | /* C++: Given an aggregate type CURTYPE, and a member name NAME, |
0d5de010 DJ |
2494 | return the appropriate member (or the address of the member, if |
2495 | WANT_ADDRESS). This function is used to resolve user expressions | |
2496 | of the form "DOMAIN::NAME". For more details on what happens, see | |
2497 | the comment before value_struct_elt_for_reference. */ | |
79c2c32d DC |
2498 | |
2499 | struct value * | |
2500 | value_aggregate_elt (struct type *curtype, | |
0d5de010 | 2501 | char *name, int want_address, |
79c2c32d DC |
2502 | enum noside noside) |
2503 | { | |
2504 | switch (TYPE_CODE (curtype)) | |
2505 | { | |
2506 | case TYPE_CODE_STRUCT: | |
2507 | case TYPE_CODE_UNION: | |
ac3eeb49 MS |
2508 | return value_struct_elt_for_reference (curtype, 0, curtype, |
2509 | name, NULL, | |
0d5de010 | 2510 | want_address, noside); |
79c2c32d | 2511 | case TYPE_CODE_NAMESPACE: |
ac3eeb49 MS |
2512 | return value_namespace_elt (curtype, name, |
2513 | want_address, noside); | |
79c2c32d DC |
2514 | default: |
2515 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 2516 | _("non-aggregate type in value_aggregate_elt")); |
79c2c32d DC |
2517 | } |
2518 | } | |
2519 | ||
c906108c | 2520 | /* C++: Given an aggregate type CURTYPE, and a member name NAME, |
ac3eeb49 MS |
2521 | return the address of this member as a "pointer to member" type. |
2522 | If INTYPE is non-null, then it will be the type of the member we | |
2523 | are looking for. This will help us resolve "pointers to member | |
2524 | functions". This function is used to resolve user expressions of | |
2525 | the form "DOMAIN::NAME". */ | |
c906108c | 2526 | |
63d06c5c | 2527 | static struct value * |
fba45db2 KB |
2528 | value_struct_elt_for_reference (struct type *domain, int offset, |
2529 | struct type *curtype, char *name, | |
ac3eeb49 MS |
2530 | struct type *intype, |
2531 | int want_address, | |
63d06c5c | 2532 | enum noside noside) |
c906108c | 2533 | { |
52f0bd74 AC |
2534 | struct type *t = curtype; |
2535 | int i; | |
0d5de010 | 2536 | struct value *v, *result; |
c906108c | 2537 | |
c5aa993b | 2538 | if (TYPE_CODE (t) != TYPE_CODE_STRUCT |
c906108c | 2539 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
8a3fe4f8 | 2540 | error (_("Internal error: non-aggregate type to value_struct_elt_for_reference")); |
c906108c SS |
2541 | |
2542 | for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--) | |
2543 | { | |
2544 | char *t_field_name = TYPE_FIELD_NAME (t, i); | |
c5aa993b | 2545 | |
6314a349 | 2546 | if (t_field_name && strcmp (t_field_name, name) == 0) |
c906108c | 2547 | { |
d6a843b5 | 2548 | if (field_is_static (&TYPE_FIELD (t, i))) |
c906108c SS |
2549 | { |
2550 | v = value_static_field (t, i); | |
2551 | if (v == NULL) | |
8a3fe4f8 | 2552 | error (_("static field %s has been optimized out"), |
c906108c | 2553 | name); |
0d5de010 DJ |
2554 | if (want_address) |
2555 | v = value_addr (v); | |
c906108c SS |
2556 | return v; |
2557 | } | |
2558 | if (TYPE_FIELD_PACKED (t, i)) | |
8a3fe4f8 | 2559 | error (_("pointers to bitfield members not allowed")); |
c5aa993b | 2560 | |
0d5de010 DJ |
2561 | if (want_address) |
2562 | return value_from_longest | |
2563 | (lookup_memberptr_type (TYPE_FIELD_TYPE (t, i), domain), | |
2564 | offset + (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3)); | |
2565 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
2566 | return allocate_value (TYPE_FIELD_TYPE (t, i)); | |
2567 | else | |
2568 | error (_("Cannot reference non-static field \"%s\""), name); | |
c906108c SS |
2569 | } |
2570 | } | |
2571 | ||
ac3eeb49 MS |
2572 | /* C++: If it was not found as a data field, then try to return it |
2573 | as a pointer to a method. */ | |
c906108c SS |
2574 | |
2575 | /* Destructors are a special case. */ | |
2576 | if (destructor_name_p (name, t)) | |
2577 | { | |
8a3fe4f8 | 2578 | error (_("member pointers to destructors not implemented yet")); |
c906108c SS |
2579 | } |
2580 | ||
2581 | /* Perform all necessary dereferencing. */ | |
2582 | while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR) | |
2583 | intype = TYPE_TARGET_TYPE (intype); | |
2584 | ||
2585 | for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i) | |
2586 | { | |
2587 | char *t_field_name = TYPE_FN_FIELDLIST_NAME (t, i); | |
2588 | char dem_opname[64]; | |
2589 | ||
ac3eeb49 MS |
2590 | if (strncmp (t_field_name, "__", 2) == 0 |
2591 | || strncmp (t_field_name, "op", 2) == 0 | |
2592 | || strncmp (t_field_name, "type", 4) == 0) | |
c906108c | 2593 | { |
ac3eeb49 MS |
2594 | if (cplus_demangle_opname (t_field_name, |
2595 | dem_opname, DMGL_ANSI)) | |
c5aa993b | 2596 | t_field_name = dem_opname; |
ac3eeb49 MS |
2597 | else if (cplus_demangle_opname (t_field_name, |
2598 | dem_opname, 0)) | |
c906108c | 2599 | t_field_name = dem_opname; |
c906108c | 2600 | } |
6314a349 | 2601 | if (t_field_name && strcmp (t_field_name, name) == 0) |
c906108c SS |
2602 | { |
2603 | int j = TYPE_FN_FIELDLIST_LENGTH (t, i); | |
2604 | struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i); | |
c5aa993b | 2605 | |
de17c821 DJ |
2606 | check_stub_method_group (t, i); |
2607 | ||
c906108c | 2608 | if (intype == 0 && j > 1) |
8a3fe4f8 | 2609 | error (_("non-unique member `%s' requires type instantiation"), name); |
c906108c SS |
2610 | if (intype) |
2611 | { | |
2612 | while (j--) | |
2613 | if (TYPE_FN_FIELD_TYPE (f, j) == intype) | |
2614 | break; | |
2615 | if (j < 0) | |
8a3fe4f8 | 2616 | error (_("no member function matches that type instantiation")); |
c906108c SS |
2617 | } |
2618 | else | |
2619 | j = 0; | |
c5aa993b | 2620 | |
0d5de010 DJ |
2621 | if (TYPE_FN_FIELD_STATIC_P (f, j)) |
2622 | { | |
ac3eeb49 MS |
2623 | struct symbol *s = |
2624 | lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), | |
2570f2b7 | 2625 | 0, VAR_DOMAIN, 0); |
0d5de010 DJ |
2626 | if (s == NULL) |
2627 | return NULL; | |
2628 | ||
2629 | if (want_address) | |
2630 | return value_addr (read_var_value (s, 0)); | |
2631 | else | |
2632 | return read_var_value (s, 0); | |
2633 | } | |
2634 | ||
c906108c SS |
2635 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) |
2636 | { | |
0d5de010 DJ |
2637 | if (want_address) |
2638 | { | |
2639 | result = allocate_value | |
2640 | (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j))); | |
ad4820ab UW |
2641 | cplus_make_method_ptr (value_type (result), |
2642 | value_contents_writeable (result), | |
0d5de010 DJ |
2643 | TYPE_FN_FIELD_VOFFSET (f, j), 1); |
2644 | } | |
2645 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) | |
2646 | return allocate_value (TYPE_FN_FIELD_TYPE (f, j)); | |
2647 | else | |
2648 | error (_("Cannot reference virtual member function \"%s\""), | |
2649 | name); | |
c906108c SS |
2650 | } |
2651 | else | |
2652 | { | |
ac3eeb49 MS |
2653 | struct symbol *s = |
2654 | lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), | |
2570f2b7 | 2655 | 0, VAR_DOMAIN, 0); |
c906108c | 2656 | if (s == NULL) |
0d5de010 DJ |
2657 | return NULL; |
2658 | ||
2659 | v = read_var_value (s, 0); | |
2660 | if (!want_address) | |
2661 | result = v; | |
c906108c SS |
2662 | else |
2663 | { | |
0d5de010 | 2664 | result = allocate_value (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j))); |
ad4820ab UW |
2665 | cplus_make_method_ptr (value_type (result), |
2666 | value_contents_writeable (result), | |
0d5de010 | 2667 | VALUE_ADDRESS (v), 0); |
c906108c | 2668 | } |
c906108c | 2669 | } |
0d5de010 | 2670 | return result; |
c906108c SS |
2671 | } |
2672 | } | |
2673 | for (i = TYPE_N_BASECLASSES (t) - 1; i >= 0; i--) | |
2674 | { | |
f23631e4 | 2675 | struct value *v; |
c906108c SS |
2676 | int base_offset; |
2677 | ||
2678 | if (BASETYPE_VIA_VIRTUAL (t, i)) | |
2679 | base_offset = 0; | |
2680 | else | |
2681 | base_offset = TYPE_BASECLASS_BITPOS (t, i) / 8; | |
2682 | v = value_struct_elt_for_reference (domain, | |
2683 | offset + base_offset, | |
2684 | TYPE_BASECLASS (t, i), | |
ac3eeb49 MS |
2685 | name, intype, |
2686 | want_address, noside); | |
c906108c SS |
2687 | if (v) |
2688 | return v; | |
2689 | } | |
63d06c5c DC |
2690 | |
2691 | /* As a last chance, pretend that CURTYPE is a namespace, and look | |
2692 | it up that way; this (frequently) works for types nested inside | |
2693 | classes. */ | |
2694 | ||
ac3eeb49 MS |
2695 | return value_maybe_namespace_elt (curtype, name, |
2696 | want_address, noside); | |
c906108c SS |
2697 | } |
2698 | ||
79c2c32d DC |
2699 | /* C++: Return the member NAME of the namespace given by the type |
2700 | CURTYPE. */ | |
2701 | ||
2702 | static struct value * | |
2703 | value_namespace_elt (const struct type *curtype, | |
0d5de010 | 2704 | char *name, int want_address, |
79c2c32d | 2705 | enum noside noside) |
63d06c5c DC |
2706 | { |
2707 | struct value *retval = value_maybe_namespace_elt (curtype, name, | |
ac3eeb49 MS |
2708 | want_address, |
2709 | noside); | |
63d06c5c DC |
2710 | |
2711 | if (retval == NULL) | |
ac3eeb49 MS |
2712 | error (_("No symbol \"%s\" in namespace \"%s\"."), |
2713 | name, TYPE_TAG_NAME (curtype)); | |
63d06c5c DC |
2714 | |
2715 | return retval; | |
2716 | } | |
2717 | ||
2718 | /* A helper function used by value_namespace_elt and | |
2719 | value_struct_elt_for_reference. It looks up NAME inside the | |
2720 | context CURTYPE; this works if CURTYPE is a namespace or if CURTYPE | |
2721 | is a class and NAME refers to a type in CURTYPE itself (as opposed | |
2722 | to, say, some base class of CURTYPE). */ | |
2723 | ||
2724 | static struct value * | |
2725 | value_maybe_namespace_elt (const struct type *curtype, | |
0d5de010 | 2726 | char *name, int want_address, |
63d06c5c | 2727 | enum noside noside) |
79c2c32d DC |
2728 | { |
2729 | const char *namespace_name = TYPE_TAG_NAME (curtype); | |
2730 | struct symbol *sym; | |
0d5de010 | 2731 | struct value *result; |
79c2c32d DC |
2732 | |
2733 | sym = cp_lookup_symbol_namespace (namespace_name, name, NULL, | |
ac3eeb49 | 2734 | get_selected_block (0), |
21b556f4 | 2735 | VAR_DOMAIN); |
79c2c32d DC |
2736 | |
2737 | if (sym == NULL) | |
63d06c5c | 2738 | return NULL; |
79c2c32d DC |
2739 | else if ((noside == EVAL_AVOID_SIDE_EFFECTS) |
2740 | && (SYMBOL_CLASS (sym) == LOC_TYPEDEF)) | |
0d5de010 | 2741 | result = allocate_value (SYMBOL_TYPE (sym)); |
79c2c32d | 2742 | else |
0d5de010 DJ |
2743 | result = value_of_variable (sym, get_selected_block (0)); |
2744 | ||
2745 | if (result && want_address) | |
2746 | result = value_addr (result); | |
2747 | ||
2748 | return result; | |
79c2c32d DC |
2749 | } |
2750 | ||
ac3eeb49 MS |
2751 | /* Given a pointer value V, find the real (RTTI) type of the object it |
2752 | points to. | |
2753 | ||
c906108c | 2754 | Other parameters FULL, TOP, USING_ENC as with value_rtti_type() |
ac3eeb49 | 2755 | and refer to the values computed for the object pointed to. */ |
c906108c SS |
2756 | |
2757 | struct type * | |
ac3eeb49 MS |
2758 | value_rtti_target_type (struct value *v, int *full, |
2759 | int *top, int *using_enc) | |
c906108c | 2760 | { |
f23631e4 | 2761 | struct value *target; |
c906108c SS |
2762 | |
2763 | target = value_ind (v); | |
2764 | ||
2765 | return value_rtti_type (target, full, top, using_enc); | |
2766 | } | |
2767 | ||
2768 | /* Given a value pointed to by ARGP, check its real run-time type, and | |
2769 | if that is different from the enclosing type, create a new value | |
2770 | using the real run-time type as the enclosing type (and of the same | |
2771 | type as ARGP) and return it, with the embedded offset adjusted to | |
ac3eeb49 MS |
2772 | be the correct offset to the enclosed object. RTYPE is the type, |
2773 | and XFULL, XTOP, and XUSING_ENC are the other parameters, computed | |
2774 | by value_rtti_type(). If these are available, they can be supplied | |
2775 | and a second call to value_rtti_type() is avoided. (Pass RTYPE == | |
2776 | NULL if they're not available. */ | |
c906108c | 2777 | |
f23631e4 | 2778 | struct value * |
ac3eeb49 MS |
2779 | value_full_object (struct value *argp, |
2780 | struct type *rtype, | |
2781 | int xfull, int xtop, | |
fba45db2 | 2782 | int xusing_enc) |
c906108c | 2783 | { |
c5aa993b | 2784 | struct type *real_type; |
c906108c SS |
2785 | int full = 0; |
2786 | int top = -1; | |
2787 | int using_enc = 0; | |
f23631e4 | 2788 | struct value *new_val; |
c906108c SS |
2789 | |
2790 | if (rtype) | |
2791 | { | |
2792 | real_type = rtype; | |
2793 | full = xfull; | |
2794 | top = xtop; | |
2795 | using_enc = xusing_enc; | |
2796 | } | |
2797 | else | |
2798 | real_type = value_rtti_type (argp, &full, &top, &using_enc); | |
2799 | ||
ac3eeb49 | 2800 | /* If no RTTI data, or if object is already complete, do nothing. */ |
4754a64e | 2801 | if (!real_type || real_type == value_enclosing_type (argp)) |
c906108c SS |
2802 | return argp; |
2803 | ||
2804 | /* If we have the full object, but for some reason the enclosing | |
ac3eeb49 MS |
2805 | type is wrong, set it. */ |
2806 | /* pai: FIXME -- sounds iffy */ | |
c906108c SS |
2807 | if (full) |
2808 | { | |
2b127877 | 2809 | argp = value_change_enclosing_type (argp, real_type); |
c906108c SS |
2810 | return argp; |
2811 | } | |
2812 | ||
2813 | /* Check if object is in memory */ | |
2814 | if (VALUE_LVAL (argp) != lval_memory) | |
2815 | { | |
ac3eeb49 MS |
2816 | warning (_("Couldn't retrieve complete object of RTTI type %s; object may be in register(s)."), |
2817 | TYPE_NAME (real_type)); | |
c5aa993b | 2818 | |
c906108c SS |
2819 | return argp; |
2820 | } | |
c5aa993b | 2821 | |
ac3eeb49 MS |
2822 | /* All other cases -- retrieve the complete object. */ |
2823 | /* Go back by the computed top_offset from the beginning of the | |
2824 | object, adjusting for the embedded offset of argp if that's what | |
2825 | value_rtti_type used for its computation. */ | |
c906108c | 2826 | new_val = value_at_lazy (real_type, VALUE_ADDRESS (argp) - top + |
13c3b5f5 | 2827 | (using_enc ? 0 : value_embedded_offset (argp))); |
04624583 | 2828 | deprecated_set_value_type (new_val, value_type (argp)); |
13c3b5f5 AC |
2829 | set_value_embedded_offset (new_val, (using_enc |
2830 | ? top + value_embedded_offset (argp) | |
2831 | : top)); | |
c906108c SS |
2832 | return new_val; |
2833 | } | |
2834 | ||
389e51db | 2835 | |
d069f99d | 2836 | /* Return the value of the local variable, if one exists. |
c906108c SS |
2837 | Flag COMPLAIN signals an error if the request is made in an |
2838 | inappropriate context. */ | |
2839 | ||
f23631e4 | 2840 | struct value * |
d069f99d | 2841 | value_of_local (const char *name, int complain) |
c906108c SS |
2842 | { |
2843 | struct symbol *func, *sym; | |
2844 | struct block *b; | |
d069f99d | 2845 | struct value * ret; |
206415a3 | 2846 | struct frame_info *frame; |
c906108c | 2847 | |
206415a3 DJ |
2848 | if (complain) |
2849 | frame = get_selected_frame (_("no frame selected")); | |
2850 | else | |
c906108c | 2851 | { |
206415a3 DJ |
2852 | frame = deprecated_safe_get_selected_frame (); |
2853 | if (frame == 0) | |
c5aa993b | 2854 | return 0; |
c906108c SS |
2855 | } |
2856 | ||
206415a3 | 2857 | func = get_frame_function (frame); |
c906108c SS |
2858 | if (!func) |
2859 | { | |
2860 | if (complain) | |
8a3fe4f8 | 2861 | error (_("no `%s' in nameless context"), name); |
c5aa993b JM |
2862 | else |
2863 | return 0; | |
c906108c SS |
2864 | } |
2865 | ||
2866 | b = SYMBOL_BLOCK_VALUE (func); | |
de4f826b | 2867 | if (dict_empty (BLOCK_DICT (b))) |
c906108c SS |
2868 | { |
2869 | if (complain) | |
8a3fe4f8 | 2870 | error (_("no args, no `%s'"), name); |
c5aa993b JM |
2871 | else |
2872 | return 0; | |
c906108c SS |
2873 | } |
2874 | ||
2875 | /* Calling lookup_block_symbol is necessary to get the LOC_REGISTER | |
2876 | symbol instead of the LOC_ARG one (if both exist). */ | |
176620f1 | 2877 | sym = lookup_block_symbol (b, name, NULL, VAR_DOMAIN); |
c906108c SS |
2878 | if (sym == NULL) |
2879 | { | |
2880 | if (complain) | |
ac3eeb49 MS |
2881 | error (_("current stack frame does not contain a variable named `%s'"), |
2882 | name); | |
c906108c SS |
2883 | else |
2884 | return NULL; | |
2885 | } | |
2886 | ||
206415a3 | 2887 | ret = read_var_value (sym, frame); |
d069f99d | 2888 | if (ret == 0 && complain) |
8a3fe4f8 | 2889 | error (_("`%s' argument unreadable"), name); |
d069f99d AF |
2890 | return ret; |
2891 | } | |
2892 | ||
2893 | /* C++/Objective-C: return the value of the class instance variable, | |
2894 | if one exists. Flag COMPLAIN signals an error if the request is | |
2895 | made in an inappropriate context. */ | |
2896 | ||
2897 | struct value * | |
2898 | value_of_this (int complain) | |
2899 | { | |
2b2d9e11 VP |
2900 | if (!current_language->la_name_of_this) |
2901 | return 0; | |
2902 | return value_of_local (current_language->la_name_of_this, complain); | |
c906108c SS |
2903 | } |
2904 | ||
ac3eeb49 MS |
2905 | /* Create a slice (sub-string, sub-array) of ARRAY, that is LENGTH |
2906 | elements long, starting at LOWBOUND. The result has the same lower | |
2907 | bound as the original ARRAY. */ | |
c906108c | 2908 | |
f23631e4 AC |
2909 | struct value * |
2910 | value_slice (struct value *array, int lowbound, int length) | |
c906108c SS |
2911 | { |
2912 | struct type *slice_range_type, *slice_type, *range_type; | |
7a67d0fe | 2913 | LONGEST lowerbound, upperbound; |
f23631e4 | 2914 | struct value *slice; |
c906108c | 2915 | struct type *array_type; |
ac3eeb49 | 2916 | |
df407dfe | 2917 | array_type = check_typedef (value_type (array)); |
c906108c SS |
2918 | if (TYPE_CODE (array_type) != TYPE_CODE_ARRAY |
2919 | && TYPE_CODE (array_type) != TYPE_CODE_STRING | |
2920 | && TYPE_CODE (array_type) != TYPE_CODE_BITSTRING) | |
8a3fe4f8 | 2921 | error (_("cannot take slice of non-array")); |
ac3eeb49 | 2922 | |
c906108c SS |
2923 | range_type = TYPE_INDEX_TYPE (array_type); |
2924 | if (get_discrete_bounds (range_type, &lowerbound, &upperbound) < 0) | |
8a3fe4f8 | 2925 | error (_("slice from bad array or bitstring")); |
ac3eeb49 | 2926 | |
c906108c | 2927 | if (lowbound < lowerbound || length < 0 |
db034ac5 | 2928 | || lowbound + length - 1 > upperbound) |
8a3fe4f8 | 2929 | error (_("slice out of range")); |
ac3eeb49 | 2930 | |
c906108c SS |
2931 | /* FIXME-type-allocation: need a way to free this type when we are |
2932 | done with it. */ | |
c5aa993b | 2933 | slice_range_type = create_range_type ((struct type *) NULL, |
c906108c | 2934 | TYPE_TARGET_TYPE (range_type), |
ac3eeb49 MS |
2935 | lowbound, |
2936 | lowbound + length - 1); | |
c906108c SS |
2937 | if (TYPE_CODE (array_type) == TYPE_CODE_BITSTRING) |
2938 | { | |
2939 | int i; | |
ac3eeb49 MS |
2940 | |
2941 | slice_type = create_set_type ((struct type *) NULL, | |
2942 | slice_range_type); | |
c906108c SS |
2943 | TYPE_CODE (slice_type) = TYPE_CODE_BITSTRING; |
2944 | slice = value_zero (slice_type, not_lval); | |
ac3eeb49 | 2945 | |
c906108c SS |
2946 | for (i = 0; i < length; i++) |
2947 | { | |
2948 | int element = value_bit_index (array_type, | |
0fd88904 | 2949 | value_contents (array), |
c906108c SS |
2950 | lowbound + i); |
2951 | if (element < 0) | |
8a3fe4f8 | 2952 | error (_("internal error accessing bitstring")); |
c906108c SS |
2953 | else if (element > 0) |
2954 | { | |
2955 | int j = i % TARGET_CHAR_BIT; | |
32c9a795 | 2956 | if (gdbarch_bits_big_endian (current_gdbarch)) |
c906108c | 2957 | j = TARGET_CHAR_BIT - 1 - j; |
990a07ab | 2958 | value_contents_raw (slice)[i / TARGET_CHAR_BIT] |= (1 << j); |
c906108c SS |
2959 | } |
2960 | } | |
ac3eeb49 MS |
2961 | /* We should set the address, bitssize, and bitspos, so the |
2962 | slice can be used on the LHS, but that may require extensions | |
2963 | to value_assign. For now, just leave as a non_lval. | |
2964 | FIXME. */ | |
c906108c SS |
2965 | } |
2966 | else | |
2967 | { | |
2968 | struct type *element_type = TYPE_TARGET_TYPE (array_type); | |
ac3eeb49 MS |
2969 | LONGEST offset = |
2970 | (lowbound - lowerbound) * TYPE_LENGTH (check_typedef (element_type)); | |
2971 | ||
2972 | slice_type = create_array_type ((struct type *) NULL, | |
2973 | element_type, | |
c906108c SS |
2974 | slice_range_type); |
2975 | TYPE_CODE (slice_type) = TYPE_CODE (array_type); | |
ac3eeb49 | 2976 | |
9214ee5f | 2977 | if (VALUE_LVAL (array) == lval_memory && value_lazy (array)) |
3e3d7139 | 2978 | slice = allocate_value_lazy (slice_type); |
c906108c | 2979 | else |
3e3d7139 JG |
2980 | { |
2981 | slice = allocate_value (slice_type); | |
2982 | memcpy (value_contents_writeable (slice), | |
2983 | value_contents (array) + offset, | |
2984 | TYPE_LENGTH (slice_type)); | |
2985 | } | |
ac3eeb49 | 2986 | |
c906108c SS |
2987 | if (VALUE_LVAL (array) == lval_internalvar) |
2988 | VALUE_LVAL (slice) = lval_internalvar_component; | |
2989 | else | |
2990 | VALUE_LVAL (slice) = VALUE_LVAL (array); | |
ac3eeb49 | 2991 | |
c906108c | 2992 | VALUE_ADDRESS (slice) = VALUE_ADDRESS (array); |
65d3800a | 2993 | VALUE_FRAME_ID (slice) = VALUE_FRAME_ID (array); |
f5cf64a7 | 2994 | set_value_offset (slice, value_offset (array) + offset); |
c906108c SS |
2995 | } |
2996 | return slice; | |
2997 | } | |
2998 | ||
ac3eeb49 MS |
2999 | /* Create a value for a FORTRAN complex number. Currently most of the |
3000 | time values are coerced to COMPLEX*16 (i.e. a complex number | |
070ad9f0 DB |
3001 | composed of 2 doubles. This really should be a smarter routine |
3002 | that figures out precision inteligently as opposed to assuming | |
ac3eeb49 | 3003 | doubles. FIXME: fmb */ |
c906108c | 3004 | |
f23631e4 | 3005 | struct value * |
ac3eeb49 MS |
3006 | value_literal_complex (struct value *arg1, |
3007 | struct value *arg2, | |
3008 | struct type *type) | |
c906108c | 3009 | { |
f23631e4 | 3010 | struct value *val; |
c906108c SS |
3011 | struct type *real_type = TYPE_TARGET_TYPE (type); |
3012 | ||
3013 | val = allocate_value (type); | |
3014 | arg1 = value_cast (real_type, arg1); | |
3015 | arg2 = value_cast (real_type, arg2); | |
3016 | ||
990a07ab | 3017 | memcpy (value_contents_raw (val), |
0fd88904 | 3018 | value_contents (arg1), TYPE_LENGTH (real_type)); |
990a07ab | 3019 | memcpy (value_contents_raw (val) + TYPE_LENGTH (real_type), |
0fd88904 | 3020 | value_contents (arg2), TYPE_LENGTH (real_type)); |
c906108c SS |
3021 | return val; |
3022 | } | |
3023 | ||
ac3eeb49 | 3024 | /* Cast a value into the appropriate complex data type. */ |
c906108c | 3025 | |
f23631e4 AC |
3026 | static struct value * |
3027 | cast_into_complex (struct type *type, struct value *val) | |
c906108c SS |
3028 | { |
3029 | struct type *real_type = TYPE_TARGET_TYPE (type); | |
ac3eeb49 | 3030 | |
df407dfe | 3031 | if (TYPE_CODE (value_type (val)) == TYPE_CODE_COMPLEX) |
c906108c | 3032 | { |
df407dfe | 3033 | struct type *val_real_type = TYPE_TARGET_TYPE (value_type (val)); |
f23631e4 AC |
3034 | struct value *re_val = allocate_value (val_real_type); |
3035 | struct value *im_val = allocate_value (val_real_type); | |
c906108c | 3036 | |
990a07ab | 3037 | memcpy (value_contents_raw (re_val), |
0fd88904 | 3038 | value_contents (val), TYPE_LENGTH (val_real_type)); |
990a07ab | 3039 | memcpy (value_contents_raw (im_val), |
0fd88904 | 3040 | value_contents (val) + TYPE_LENGTH (val_real_type), |
c5aa993b | 3041 | TYPE_LENGTH (val_real_type)); |
c906108c SS |
3042 | |
3043 | return value_literal_complex (re_val, im_val, type); | |
3044 | } | |
df407dfe AC |
3045 | else if (TYPE_CODE (value_type (val)) == TYPE_CODE_FLT |
3046 | || TYPE_CODE (value_type (val)) == TYPE_CODE_INT) | |
ac3eeb49 MS |
3047 | return value_literal_complex (val, |
3048 | value_zero (real_type, not_lval), | |
3049 | type); | |
c906108c | 3050 | else |
8a3fe4f8 | 3051 | error (_("cannot cast non-number to complex")); |
c906108c SS |
3052 | } |
3053 | ||
3054 | void | |
fba45db2 | 3055 | _initialize_valops (void) |
c906108c | 3056 | { |
5bf193a2 AC |
3057 | add_setshow_boolean_cmd ("overload-resolution", class_support, |
3058 | &overload_resolution, _("\ | |
3059 | Set overload resolution in evaluating C++ functions."), _("\ | |
ac3eeb49 MS |
3060 | Show overload resolution in evaluating C++ functions."), |
3061 | NULL, NULL, | |
920d2a44 | 3062 | show_overload_resolution, |
5bf193a2 | 3063 | &setlist, &showlist); |
c906108c | 3064 | overload_resolution = 1; |
c906108c | 3065 | } |