| 1 | /* Perform non-arithmetic operations on values, for GDB. |
| 2 | |
| 3 | Copyright (C) 1986-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "symtab.h" |
| 22 | #include "gdbtypes.h" |
| 23 | #include "value.h" |
| 24 | #include "frame.h" |
| 25 | #include "inferior.h" |
| 26 | #include "gdbcore.h" |
| 27 | #include "target.h" |
| 28 | #include "demangle.h" |
| 29 | #include "language.h" |
| 30 | #include "gdbcmd.h" |
| 31 | #include "regcache.h" |
| 32 | #include "cp-abi.h" |
| 33 | #include "block.h" |
| 34 | #include "infcall.h" |
| 35 | #include "dictionary.h" |
| 36 | #include "cp-support.h" |
| 37 | #include "target-float.h" |
| 38 | #include "tracepoint.h" |
| 39 | #include "observable.h" |
| 40 | #include "objfiles.h" |
| 41 | #include "extension.h" |
| 42 | #include "byte-vector.h" |
| 43 | |
| 44 | extern unsigned int overload_debug; |
| 45 | /* Local functions. */ |
| 46 | |
| 47 | static int typecmp (int staticp, int varargs, int nargs, |
| 48 | struct field t1[], struct value *t2[]); |
| 49 | |
| 50 | static struct value *search_struct_field (const char *, struct value *, |
| 51 | struct type *, int); |
| 52 | |
| 53 | static struct value *search_struct_method (const char *, struct value **, |
| 54 | struct value **, |
| 55 | LONGEST, int *, struct type *); |
| 56 | |
| 57 | static int find_oload_champ_namespace (struct value **, int, |
| 58 | const char *, const char *, |
| 59 | struct symbol ***, |
| 60 | struct badness_vector **, |
| 61 | const int no_adl); |
| 62 | |
| 63 | static |
| 64 | int find_oload_champ_namespace_loop (struct value **, int, |
| 65 | const char *, const char *, |
| 66 | int, struct symbol ***, |
| 67 | struct badness_vector **, int *, |
| 68 | const int no_adl); |
| 69 | |
| 70 | static int find_oload_champ (struct value **, int, int, |
| 71 | struct fn_field *, |
| 72 | const std::vector<xmethod_worker_up> *, |
| 73 | struct symbol **, struct badness_vector **); |
| 74 | |
| 75 | static int oload_method_static_p (struct fn_field *, int); |
| 76 | |
| 77 | enum oload_classification { STANDARD, NON_STANDARD, INCOMPATIBLE }; |
| 78 | |
| 79 | static enum |
| 80 | oload_classification classify_oload_match (struct badness_vector *, |
| 81 | int, int); |
| 82 | |
| 83 | static struct value *value_struct_elt_for_reference (struct type *, |
| 84 | int, struct type *, |
| 85 | const char *, |
| 86 | struct type *, |
| 87 | int, enum noside); |
| 88 | |
| 89 | static struct value *value_namespace_elt (const struct type *, |
| 90 | const char *, int , enum noside); |
| 91 | |
| 92 | static struct value *value_maybe_namespace_elt (const struct type *, |
| 93 | const char *, int, |
| 94 | enum noside); |
| 95 | |
| 96 | static CORE_ADDR allocate_space_in_inferior (int); |
| 97 | |
| 98 | static struct value *cast_into_complex (struct type *, struct value *); |
| 99 | |
| 100 | static void find_method_list (struct value **, const char *, |
| 101 | LONGEST, struct type *, struct fn_field **, int *, |
| 102 | std::vector<xmethod_worker_up> *, |
| 103 | struct type **, LONGEST *); |
| 104 | |
| 105 | #if 0 |
| 106 | /* Flag for whether we want to abandon failed expression evals by |
| 107 | default. */ |
| 108 | |
| 109 | static int auto_abandon = 0; |
| 110 | #endif |
| 111 | |
| 112 | int overload_resolution = 0; |
| 113 | static void |
| 114 | show_overload_resolution (struct ui_file *file, int from_tty, |
| 115 | struct cmd_list_element *c, |
| 116 | const char *value) |
| 117 | { |
| 118 | fprintf_filtered (file, _("Overload resolution in evaluating " |
| 119 | "C++ functions is %s.\n"), |
| 120 | value); |
| 121 | } |
| 122 | |
| 123 | /* Find the address of function name NAME in the inferior. If OBJF_P |
| 124 | is non-NULL, *OBJF_P will be set to the OBJFILE where the function |
| 125 | is defined. */ |
| 126 | |
| 127 | struct value * |
| 128 | find_function_in_inferior (const char *name, struct objfile **objf_p) |
| 129 | { |
| 130 | struct block_symbol sym; |
| 131 | |
| 132 | sym = lookup_symbol (name, 0, VAR_DOMAIN, 0); |
| 133 | if (sym.symbol != NULL) |
| 134 | { |
| 135 | if (SYMBOL_CLASS (sym.symbol) != LOC_BLOCK) |
| 136 | { |
| 137 | error (_("\"%s\" exists in this program but is not a function."), |
| 138 | name); |
| 139 | } |
| 140 | |
| 141 | if (objf_p) |
| 142 | *objf_p = symbol_objfile (sym.symbol); |
| 143 | |
| 144 | return value_of_variable (sym.symbol, sym.block); |
| 145 | } |
| 146 | else |
| 147 | { |
| 148 | struct bound_minimal_symbol msymbol = |
| 149 | lookup_bound_minimal_symbol (name); |
| 150 | |
| 151 | if (msymbol.minsym != NULL) |
| 152 | { |
| 153 | struct objfile *objfile = msymbol.objfile; |
| 154 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| 155 | |
| 156 | struct type *type; |
| 157 | CORE_ADDR maddr; |
| 158 | type = lookup_pointer_type (builtin_type (gdbarch)->builtin_char); |
| 159 | type = lookup_function_type (type); |
| 160 | type = lookup_pointer_type (type); |
| 161 | maddr = BMSYMBOL_VALUE_ADDRESS (msymbol); |
| 162 | |
| 163 | if (objf_p) |
| 164 | *objf_p = objfile; |
| 165 | |
| 166 | return value_from_pointer (type, maddr); |
| 167 | } |
| 168 | else |
| 169 | { |
| 170 | if (!target_has_execution) |
| 171 | error (_("evaluation of this expression " |
| 172 | "requires the target program to be active")); |
| 173 | else |
| 174 | error (_("evaluation of this expression requires the " |
| 175 | "program to have a function \"%s\"."), |
| 176 | name); |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | /* Allocate NBYTES of space in the inferior using the inferior's |
| 182 | malloc and return a value that is a pointer to the allocated |
| 183 | space. */ |
| 184 | |
| 185 | struct value * |
| 186 | value_allocate_space_in_inferior (int len) |
| 187 | { |
| 188 | struct objfile *objf; |
| 189 | struct value *val = find_function_in_inferior ("malloc", &objf); |
| 190 | struct gdbarch *gdbarch = get_objfile_arch (objf); |
| 191 | struct value *blocklen; |
| 192 | |
| 193 | blocklen = value_from_longest (builtin_type (gdbarch)->builtin_int, len); |
| 194 | val = call_function_by_hand (val, NULL, 1, &blocklen); |
| 195 | if (value_logical_not (val)) |
| 196 | { |
| 197 | if (!target_has_execution) |
| 198 | error (_("No memory available to program now: " |
| 199 | "you need to start the target first")); |
| 200 | else |
| 201 | error (_("No memory available to program: call to malloc failed")); |
| 202 | } |
| 203 | return val; |
| 204 | } |
| 205 | |
| 206 | static CORE_ADDR |
| 207 | allocate_space_in_inferior (int len) |
| 208 | { |
| 209 | return value_as_long (value_allocate_space_in_inferior (len)); |
| 210 | } |
| 211 | |
| 212 | /* Cast struct value VAL to type TYPE and return as a value. |
| 213 | Both type and val must be of TYPE_CODE_STRUCT or TYPE_CODE_UNION |
| 214 | for this to work. Typedef to one of the codes is permitted. |
| 215 | Returns NULL if the cast is neither an upcast nor a downcast. */ |
| 216 | |
| 217 | static struct value * |
| 218 | value_cast_structs (struct type *type, struct value *v2) |
| 219 | { |
| 220 | struct type *t1; |
| 221 | struct type *t2; |
| 222 | struct value *v; |
| 223 | |
| 224 | gdb_assert (type != NULL && v2 != NULL); |
| 225 | |
| 226 | t1 = check_typedef (type); |
| 227 | t2 = check_typedef (value_type (v2)); |
| 228 | |
| 229 | /* Check preconditions. */ |
| 230 | gdb_assert ((TYPE_CODE (t1) == TYPE_CODE_STRUCT |
| 231 | || TYPE_CODE (t1) == TYPE_CODE_UNION) |
| 232 | && !!"Precondition is that type is of STRUCT or UNION kind."); |
| 233 | gdb_assert ((TYPE_CODE (t2) == TYPE_CODE_STRUCT |
| 234 | || TYPE_CODE (t2) == TYPE_CODE_UNION) |
| 235 | && !!"Precondition is that value is of STRUCT or UNION kind"); |
| 236 | |
| 237 | if (TYPE_NAME (t1) != NULL |
| 238 | && TYPE_NAME (t2) != NULL |
| 239 | && !strcmp (TYPE_NAME (t1), TYPE_NAME (t2))) |
| 240 | return NULL; |
| 241 | |
| 242 | /* Upcasting: look in the type of the source to see if it contains the |
| 243 | type of the target as a superclass. If so, we'll need to |
| 244 | offset the pointer rather than just change its type. */ |
| 245 | if (TYPE_NAME (t1) != NULL) |
| 246 | { |
| 247 | v = search_struct_field (type_name_no_tag (t1), |
| 248 | v2, t2, 1); |
| 249 | if (v) |
| 250 | return v; |
| 251 | } |
| 252 | |
| 253 | /* Downcasting: look in the type of the target to see if it contains the |
| 254 | type of the source as a superclass. If so, we'll need to |
| 255 | offset the pointer rather than just change its type. */ |
| 256 | if (TYPE_NAME (t2) != NULL) |
| 257 | { |
| 258 | /* Try downcasting using the run-time type of the value. */ |
| 259 | int full, using_enc; |
| 260 | LONGEST top; |
| 261 | struct type *real_type; |
| 262 | |
| 263 | real_type = value_rtti_type (v2, &full, &top, &using_enc); |
| 264 | if (real_type) |
| 265 | { |
| 266 | v = value_full_object (v2, real_type, full, top, using_enc); |
| 267 | v = value_at_lazy (real_type, value_address (v)); |
| 268 | real_type = value_type (v); |
| 269 | |
| 270 | /* We might be trying to cast to the outermost enclosing |
| 271 | type, in which case search_struct_field won't work. */ |
| 272 | if (TYPE_NAME (real_type) != NULL |
| 273 | && !strcmp (TYPE_NAME (real_type), TYPE_NAME (t1))) |
| 274 | return v; |
| 275 | |
| 276 | v = search_struct_field (type_name_no_tag (t2), v, real_type, 1); |
| 277 | if (v) |
| 278 | return v; |
| 279 | } |
| 280 | |
| 281 | /* Try downcasting using information from the destination type |
| 282 | T2. This wouldn't work properly for classes with virtual |
| 283 | bases, but those were handled above. */ |
| 284 | v = search_struct_field (type_name_no_tag (t2), |
| 285 | value_zero (t1, not_lval), t1, 1); |
| 286 | if (v) |
| 287 | { |
| 288 | /* Downcasting is possible (t1 is superclass of v2). */ |
| 289 | CORE_ADDR addr2 = value_address (v2); |
| 290 | |
| 291 | addr2 -= value_address (v) + value_embedded_offset (v); |
| 292 | return value_at (type, addr2); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | /* Cast one pointer or reference type to another. Both TYPE and |
| 300 | the type of ARG2 should be pointer types, or else both should be |
| 301 | reference types. If SUBCLASS_CHECK is non-zero, this will force a |
| 302 | check to see whether TYPE is a superclass of ARG2's type. If |
| 303 | SUBCLASS_CHECK is zero, then the subclass check is done only when |
| 304 | ARG2 is itself non-zero. Returns the new pointer or reference. */ |
| 305 | |
| 306 | struct value * |
| 307 | value_cast_pointers (struct type *type, struct value *arg2, |
| 308 | int subclass_check) |
| 309 | { |
| 310 | struct type *type1 = check_typedef (type); |
| 311 | struct type *type2 = check_typedef (value_type (arg2)); |
| 312 | struct type *t1 = check_typedef (TYPE_TARGET_TYPE (type1)); |
| 313 | struct type *t2 = check_typedef (TYPE_TARGET_TYPE (type2)); |
| 314 | |
| 315 | if (TYPE_CODE (t1) == TYPE_CODE_STRUCT |
| 316 | && TYPE_CODE (t2) == TYPE_CODE_STRUCT |
| 317 | && (subclass_check || !value_logical_not (arg2))) |
| 318 | { |
| 319 | struct value *v2; |
| 320 | |
| 321 | if (TYPE_IS_REFERENCE (type2)) |
| 322 | v2 = coerce_ref (arg2); |
| 323 | else |
| 324 | v2 = value_ind (arg2); |
| 325 | gdb_assert (TYPE_CODE (check_typedef (value_type (v2))) |
| 326 | == TYPE_CODE_STRUCT && !!"Why did coercion fail?"); |
| 327 | v2 = value_cast_structs (t1, v2); |
| 328 | /* At this point we have what we can have, un-dereference if needed. */ |
| 329 | if (v2) |
| 330 | { |
| 331 | struct value *v = value_addr (v2); |
| 332 | |
| 333 | deprecated_set_value_type (v, type); |
| 334 | return v; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /* No superclass found, just change the pointer type. */ |
| 339 | arg2 = value_copy (arg2); |
| 340 | deprecated_set_value_type (arg2, type); |
| 341 | set_value_enclosing_type (arg2, type); |
| 342 | set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */ |
| 343 | return arg2; |
| 344 | } |
| 345 | |
| 346 | /* Cast value ARG2 to type TYPE and return as a value. |
| 347 | More general than a C cast: accepts any two types of the same length, |
| 348 | and if ARG2 is an lvalue it can be cast into anything at all. */ |
| 349 | /* In C++, casts may change pointer or object representations. */ |
| 350 | |
| 351 | struct value * |
| 352 | value_cast (struct type *type, struct value *arg2) |
| 353 | { |
| 354 | enum type_code code1; |
| 355 | enum type_code code2; |
| 356 | int scalar; |
| 357 | struct type *type2; |
| 358 | |
| 359 | int convert_to_boolean = 0; |
| 360 | |
| 361 | if (value_type (arg2) == type) |
| 362 | return arg2; |
| 363 | |
| 364 | /* Check if we are casting struct reference to struct reference. */ |
| 365 | if (TYPE_IS_REFERENCE (check_typedef (type))) |
| 366 | { |
| 367 | /* We dereference type; then we recurse and finally |
| 368 | we generate value of the given reference. Nothing wrong with |
| 369 | that. */ |
| 370 | struct type *t1 = check_typedef (type); |
| 371 | struct type *dereftype = check_typedef (TYPE_TARGET_TYPE (t1)); |
| 372 | struct value *val = value_cast (dereftype, arg2); |
| 373 | |
| 374 | return value_ref (val, TYPE_CODE (t1)); |
| 375 | } |
| 376 | |
| 377 | if (TYPE_IS_REFERENCE (check_typedef (value_type (arg2)))) |
| 378 | /* We deref the value and then do the cast. */ |
| 379 | return value_cast (type, coerce_ref (arg2)); |
| 380 | |
| 381 | /* Strip typedefs / resolve stubs in order to get at the type's |
| 382 | code/length, but remember the original type, to use as the |
| 383 | resulting type of the cast, in case it was a typedef. */ |
| 384 | struct type *to_type = type; |
| 385 | |
| 386 | type = check_typedef (type); |
| 387 | code1 = TYPE_CODE (type); |
| 388 | arg2 = coerce_ref (arg2); |
| 389 | type2 = check_typedef (value_type (arg2)); |
| 390 | |
| 391 | /* You can't cast to a reference type. See value_cast_pointers |
| 392 | instead. */ |
| 393 | gdb_assert (!TYPE_IS_REFERENCE (type)); |
| 394 | |
| 395 | /* A cast to an undetermined-length array_type, such as |
| 396 | (TYPE [])OBJECT, is treated like a cast to (TYPE [N])OBJECT, |
| 397 | where N is sizeof(OBJECT)/sizeof(TYPE). */ |
| 398 | if (code1 == TYPE_CODE_ARRAY) |
| 399 | { |
| 400 | struct type *element_type = TYPE_TARGET_TYPE (type); |
| 401 | unsigned element_length = TYPE_LENGTH (check_typedef (element_type)); |
| 402 | |
| 403 | if (element_length > 0 && TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type)) |
| 404 | { |
| 405 | struct type *range_type = TYPE_INDEX_TYPE (type); |
| 406 | int val_length = TYPE_LENGTH (type2); |
| 407 | LONGEST low_bound, high_bound, new_length; |
| 408 | |
| 409 | if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0) |
| 410 | low_bound = 0, high_bound = 0; |
| 411 | new_length = val_length / element_length; |
| 412 | if (val_length % element_length != 0) |
| 413 | warning (_("array element type size does not " |
| 414 | "divide object size in cast")); |
| 415 | /* FIXME-type-allocation: need a way to free this type when |
| 416 | we are done with it. */ |
| 417 | range_type = create_static_range_type ((struct type *) NULL, |
| 418 | TYPE_TARGET_TYPE (range_type), |
| 419 | low_bound, |
| 420 | new_length + low_bound - 1); |
| 421 | deprecated_set_value_type (arg2, |
| 422 | create_array_type ((struct type *) NULL, |
| 423 | element_type, |
| 424 | range_type)); |
| 425 | return arg2; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | if (current_language->c_style_arrays |
| 430 | && TYPE_CODE (type2) == TYPE_CODE_ARRAY |
| 431 | && !TYPE_VECTOR (type2)) |
| 432 | arg2 = value_coerce_array (arg2); |
| 433 | |
| 434 | if (TYPE_CODE (type2) == TYPE_CODE_FUNC) |
| 435 | arg2 = value_coerce_function (arg2); |
| 436 | |
| 437 | type2 = check_typedef (value_type (arg2)); |
| 438 | code2 = TYPE_CODE (type2); |
| 439 | |
| 440 | if (code1 == TYPE_CODE_COMPLEX) |
| 441 | return cast_into_complex (to_type, arg2); |
| 442 | if (code1 == TYPE_CODE_BOOL) |
| 443 | { |
| 444 | code1 = TYPE_CODE_INT; |
| 445 | convert_to_boolean = 1; |
| 446 | } |
| 447 | if (code1 == TYPE_CODE_CHAR) |
| 448 | code1 = TYPE_CODE_INT; |
| 449 | if (code2 == TYPE_CODE_BOOL || code2 == TYPE_CODE_CHAR) |
| 450 | code2 = TYPE_CODE_INT; |
| 451 | |
| 452 | scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT |
| 453 | || code2 == TYPE_CODE_DECFLOAT || code2 == TYPE_CODE_ENUM |
| 454 | || code2 == TYPE_CODE_RANGE); |
| 455 | |
| 456 | if ((code1 == TYPE_CODE_STRUCT || code1 == TYPE_CODE_UNION) |
| 457 | && (code2 == TYPE_CODE_STRUCT || code2 == TYPE_CODE_UNION) |
| 458 | && TYPE_NAME (type) != 0) |
| 459 | { |
| 460 | struct value *v = value_cast_structs (to_type, arg2); |
| 461 | |
| 462 | if (v) |
| 463 | return v; |
| 464 | } |
| 465 | |
| 466 | if (is_floating_type (type) && scalar) |
| 467 | { |
| 468 | if (is_floating_value (arg2)) |
| 469 | { |
| 470 | struct value *v = allocate_value (to_type); |
| 471 | target_float_convert (value_contents (arg2), type2, |
| 472 | value_contents_raw (v), type); |
| 473 | return v; |
| 474 | } |
| 475 | |
| 476 | /* The only option left is an integral type. */ |
| 477 | if (TYPE_UNSIGNED (type2)) |
| 478 | return value_from_ulongest (to_type, value_as_long (arg2)); |
| 479 | else |
| 480 | return value_from_longest (to_type, value_as_long (arg2)); |
| 481 | } |
| 482 | else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM |
| 483 | || code1 == TYPE_CODE_RANGE) |
| 484 | && (scalar || code2 == TYPE_CODE_PTR |
| 485 | || code2 == TYPE_CODE_MEMBERPTR)) |
| 486 | { |
| 487 | LONGEST longest; |
| 488 | |
| 489 | /* When we cast pointers to integers, we mustn't use |
| 490 | gdbarch_pointer_to_address to find the address the pointer |
| 491 | represents, as value_as_long would. GDB should evaluate |
| 492 | expressions just as the compiler would --- and the compiler |
| 493 | sees a cast as a simple reinterpretation of the pointer's |
| 494 | bits. */ |
| 495 | if (code2 == TYPE_CODE_PTR) |
| 496 | longest = extract_unsigned_integer |
| 497 | (value_contents (arg2), TYPE_LENGTH (type2), |
| 498 | gdbarch_byte_order (get_type_arch (type2))); |
| 499 | else |
| 500 | longest = value_as_long (arg2); |
| 501 | return value_from_longest (to_type, convert_to_boolean ? |
| 502 | (LONGEST) (longest ? 1 : 0) : longest); |
| 503 | } |
| 504 | else if (code1 == TYPE_CODE_PTR && (code2 == TYPE_CODE_INT |
| 505 | || code2 == TYPE_CODE_ENUM |
| 506 | || code2 == TYPE_CODE_RANGE)) |
| 507 | { |
| 508 | /* TYPE_LENGTH (type) is the length of a pointer, but we really |
| 509 | want the length of an address! -- we are really dealing with |
| 510 | addresses (i.e., gdb representations) not pointers (i.e., |
| 511 | target representations) here. |
| 512 | |
| 513 | This allows things like "print *(int *)0x01000234" to work |
| 514 | without printing a misleading message -- which would |
| 515 | otherwise occur when dealing with a target having two byte |
| 516 | pointers and four byte addresses. */ |
| 517 | |
| 518 | int addr_bit = gdbarch_addr_bit (get_type_arch (type2)); |
| 519 | LONGEST longest = value_as_long (arg2); |
| 520 | |
| 521 | if (addr_bit < sizeof (LONGEST) * HOST_CHAR_BIT) |
| 522 | { |
| 523 | if (longest >= ((LONGEST) 1 << addr_bit) |
| 524 | || longest <= -((LONGEST) 1 << addr_bit)) |
| 525 | warning (_("value truncated")); |
| 526 | } |
| 527 | return value_from_longest (to_type, longest); |
| 528 | } |
| 529 | else if (code1 == TYPE_CODE_METHODPTR && code2 == TYPE_CODE_INT |
| 530 | && value_as_long (arg2) == 0) |
| 531 | { |
| 532 | struct value *result = allocate_value (to_type); |
| 533 | |
| 534 | cplus_make_method_ptr (to_type, value_contents_writeable (result), 0, 0); |
| 535 | return result; |
| 536 | } |
| 537 | else if (code1 == TYPE_CODE_MEMBERPTR && code2 == TYPE_CODE_INT |
| 538 | && value_as_long (arg2) == 0) |
| 539 | { |
| 540 | /* The Itanium C++ ABI represents NULL pointers to members as |
| 541 | minus one, instead of biasing the normal case. */ |
| 542 | return value_from_longest (to_type, -1); |
| 543 | } |
| 544 | else if (code1 == TYPE_CODE_ARRAY && TYPE_VECTOR (type) |
| 545 | && code2 == TYPE_CODE_ARRAY && TYPE_VECTOR (type2) |
| 546 | && TYPE_LENGTH (type) != TYPE_LENGTH (type2)) |
| 547 | error (_("Cannot convert between vector values of different sizes")); |
| 548 | else if (code1 == TYPE_CODE_ARRAY && TYPE_VECTOR (type) && scalar |
| 549 | && TYPE_LENGTH (type) != TYPE_LENGTH (type2)) |
| 550 | error (_("can only cast scalar to vector of same size")); |
| 551 | else if (code1 == TYPE_CODE_VOID) |
| 552 | { |
| 553 | return value_zero (to_type, not_lval); |
| 554 | } |
| 555 | else if (TYPE_LENGTH (type) == TYPE_LENGTH (type2)) |
| 556 | { |
| 557 | if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR) |
| 558 | return value_cast_pointers (to_type, arg2, 0); |
| 559 | |
| 560 | arg2 = value_copy (arg2); |
| 561 | deprecated_set_value_type (arg2, to_type); |
| 562 | set_value_enclosing_type (arg2, to_type); |
| 563 | set_value_pointed_to_offset (arg2, 0); /* pai: chk_val */ |
| 564 | return arg2; |
| 565 | } |
| 566 | else if (VALUE_LVAL (arg2) == lval_memory) |
| 567 | return value_at_lazy (to_type, value_address (arg2)); |
| 568 | else |
| 569 | { |
| 570 | error (_("Invalid cast.")); |
| 571 | return 0; |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | /* The C++ reinterpret_cast operator. */ |
| 576 | |
| 577 | struct value * |
| 578 | value_reinterpret_cast (struct type *type, struct value *arg) |
| 579 | { |
| 580 | struct value *result; |
| 581 | struct type *real_type = check_typedef (type); |
| 582 | struct type *arg_type, *dest_type; |
| 583 | int is_ref = 0; |
| 584 | enum type_code dest_code, arg_code; |
| 585 | |
| 586 | /* Do reference, function, and array conversion. */ |
| 587 | arg = coerce_array (arg); |
| 588 | |
| 589 | /* Attempt to preserve the type the user asked for. */ |
| 590 | dest_type = type; |
| 591 | |
| 592 | /* If we are casting to a reference type, transform |
| 593 | reinterpret_cast<T&[&]>(V) to *reinterpret_cast<T*>(&V). */ |
| 594 | if (TYPE_IS_REFERENCE (real_type)) |
| 595 | { |
| 596 | is_ref = 1; |
| 597 | arg = value_addr (arg); |
| 598 | dest_type = lookup_pointer_type (TYPE_TARGET_TYPE (dest_type)); |
| 599 | real_type = lookup_pointer_type (real_type); |
| 600 | } |
| 601 | |
| 602 | arg_type = value_type (arg); |
| 603 | |
| 604 | dest_code = TYPE_CODE (real_type); |
| 605 | arg_code = TYPE_CODE (arg_type); |
| 606 | |
| 607 | /* We can convert pointer types, or any pointer type to int, or int |
| 608 | type to pointer. */ |
| 609 | if ((dest_code == TYPE_CODE_PTR && arg_code == TYPE_CODE_INT) |
| 610 | || (dest_code == TYPE_CODE_INT && arg_code == TYPE_CODE_PTR) |
| 611 | || (dest_code == TYPE_CODE_METHODPTR && arg_code == TYPE_CODE_INT) |
| 612 | || (dest_code == TYPE_CODE_INT && arg_code == TYPE_CODE_METHODPTR) |
| 613 | || (dest_code == TYPE_CODE_MEMBERPTR && arg_code == TYPE_CODE_INT) |
| 614 | || (dest_code == TYPE_CODE_INT && arg_code == TYPE_CODE_MEMBERPTR) |
| 615 | || (dest_code == arg_code |
| 616 | && (dest_code == TYPE_CODE_PTR |
| 617 | || dest_code == TYPE_CODE_METHODPTR |
| 618 | || dest_code == TYPE_CODE_MEMBERPTR))) |
| 619 | result = value_cast (dest_type, arg); |
| 620 | else |
| 621 | error (_("Invalid reinterpret_cast")); |
| 622 | |
| 623 | if (is_ref) |
| 624 | result = value_cast (type, value_ref (value_ind (result), |
| 625 | TYPE_CODE (type))); |
| 626 | |
| 627 | return result; |
| 628 | } |
| 629 | |
| 630 | /* A helper for value_dynamic_cast. This implements the first of two |
| 631 | runtime checks: we iterate over all the base classes of the value's |
| 632 | class which are equal to the desired class; if only one of these |
| 633 | holds the value, then it is the answer. */ |
| 634 | |
| 635 | static int |
| 636 | dynamic_cast_check_1 (struct type *desired_type, |
| 637 | const gdb_byte *valaddr, |
| 638 | LONGEST embedded_offset, |
| 639 | CORE_ADDR address, |
| 640 | struct value *val, |
| 641 | struct type *search_type, |
| 642 | CORE_ADDR arg_addr, |
| 643 | struct type *arg_type, |
| 644 | struct value **result) |
| 645 | { |
| 646 | int i, result_count = 0; |
| 647 | |
| 648 | for (i = 0; i < TYPE_N_BASECLASSES (search_type) && result_count < 2; ++i) |
| 649 | { |
| 650 | LONGEST offset = baseclass_offset (search_type, i, valaddr, |
| 651 | embedded_offset, |
| 652 | address, val); |
| 653 | |
| 654 | if (class_types_same_p (desired_type, TYPE_BASECLASS (search_type, i))) |
| 655 | { |
| 656 | if (address + embedded_offset + offset >= arg_addr |
| 657 | && address + embedded_offset + offset < arg_addr + TYPE_LENGTH (arg_type)) |
| 658 | { |
| 659 | ++result_count; |
| 660 | if (!*result) |
| 661 | *result = value_at_lazy (TYPE_BASECLASS (search_type, i), |
| 662 | address + embedded_offset + offset); |
| 663 | } |
| 664 | } |
| 665 | else |
| 666 | result_count += dynamic_cast_check_1 (desired_type, |
| 667 | valaddr, |
| 668 | embedded_offset + offset, |
| 669 | address, val, |
| 670 | TYPE_BASECLASS (search_type, i), |
| 671 | arg_addr, |
| 672 | arg_type, |
| 673 | result); |
| 674 | } |
| 675 | |
| 676 | return result_count; |
| 677 | } |
| 678 | |
| 679 | /* A helper for value_dynamic_cast. This implements the second of two |
| 680 | runtime checks: we look for a unique public sibling class of the |
| 681 | argument's declared class. */ |
| 682 | |
| 683 | static int |
| 684 | dynamic_cast_check_2 (struct type *desired_type, |
| 685 | const gdb_byte *valaddr, |
| 686 | LONGEST embedded_offset, |
| 687 | CORE_ADDR address, |
| 688 | struct value *val, |
| 689 | struct type *search_type, |
| 690 | struct value **result) |
| 691 | { |
| 692 | int i, result_count = 0; |
| 693 | |
| 694 | for (i = 0; i < TYPE_N_BASECLASSES (search_type) && result_count < 2; ++i) |
| 695 | { |
| 696 | LONGEST offset; |
| 697 | |
| 698 | if (! BASETYPE_VIA_PUBLIC (search_type, i)) |
| 699 | continue; |
| 700 | |
| 701 | offset = baseclass_offset (search_type, i, valaddr, embedded_offset, |
| 702 | address, val); |
| 703 | if (class_types_same_p (desired_type, TYPE_BASECLASS (search_type, i))) |
| 704 | { |
| 705 | ++result_count; |
| 706 | if (*result == NULL) |
| 707 | *result = value_at_lazy (TYPE_BASECLASS (search_type, i), |
| 708 | address + embedded_offset + offset); |
| 709 | } |
| 710 | else |
| 711 | result_count += dynamic_cast_check_2 (desired_type, |
| 712 | valaddr, |
| 713 | embedded_offset + offset, |
| 714 | address, val, |
| 715 | TYPE_BASECLASS (search_type, i), |
| 716 | result); |
| 717 | } |
| 718 | |
| 719 | return result_count; |
| 720 | } |
| 721 | |
| 722 | /* The C++ dynamic_cast operator. */ |
| 723 | |
| 724 | struct value * |
| 725 | value_dynamic_cast (struct type *type, struct value *arg) |
| 726 | { |
| 727 | int full, using_enc; |
| 728 | LONGEST top; |
| 729 | struct type *resolved_type = check_typedef (type); |
| 730 | struct type *arg_type = check_typedef (value_type (arg)); |
| 731 | struct type *class_type, *rtti_type; |
| 732 | struct value *result, *tem, *original_arg = arg; |
| 733 | CORE_ADDR addr; |
| 734 | int is_ref = TYPE_IS_REFERENCE (resolved_type); |
| 735 | |
| 736 | if (TYPE_CODE (resolved_type) != TYPE_CODE_PTR |
| 737 | && !TYPE_IS_REFERENCE (resolved_type)) |
| 738 | error (_("Argument to dynamic_cast must be a pointer or reference type")); |
| 739 | if (TYPE_CODE (TYPE_TARGET_TYPE (resolved_type)) != TYPE_CODE_VOID |
| 740 | && TYPE_CODE (TYPE_TARGET_TYPE (resolved_type)) != TYPE_CODE_STRUCT) |
| 741 | error (_("Argument to dynamic_cast must be pointer to class or `void *'")); |
| 742 | |
| 743 | class_type = check_typedef (TYPE_TARGET_TYPE (resolved_type)); |
| 744 | if (TYPE_CODE (resolved_type) == TYPE_CODE_PTR) |
| 745 | { |
| 746 | if (TYPE_CODE (arg_type) != TYPE_CODE_PTR |
| 747 | && ! (TYPE_CODE (arg_type) == TYPE_CODE_INT |
| 748 | && value_as_long (arg) == 0)) |
| 749 | error (_("Argument to dynamic_cast does not have pointer type")); |
| 750 | if (TYPE_CODE (arg_type) == TYPE_CODE_PTR) |
| 751 | { |
| 752 | arg_type = check_typedef (TYPE_TARGET_TYPE (arg_type)); |
| 753 | if (TYPE_CODE (arg_type) != TYPE_CODE_STRUCT) |
| 754 | error (_("Argument to dynamic_cast does " |
| 755 | "not have pointer to class type")); |
| 756 | } |
| 757 | |
| 758 | /* Handle NULL pointers. */ |
| 759 | if (value_as_long (arg) == 0) |
| 760 | return value_zero (type, not_lval); |
| 761 | |
| 762 | arg = value_ind (arg); |
| 763 | } |
| 764 | else |
| 765 | { |
| 766 | if (TYPE_CODE (arg_type) != TYPE_CODE_STRUCT) |
| 767 | error (_("Argument to dynamic_cast does not have class type")); |
| 768 | } |
| 769 | |
| 770 | /* If the classes are the same, just return the argument. */ |
| 771 | if (class_types_same_p (class_type, arg_type)) |
| 772 | return value_cast (type, arg); |
| 773 | |
| 774 | /* If the target type is a unique base class of the argument's |
| 775 | declared type, just cast it. */ |
| 776 | if (is_ancestor (class_type, arg_type)) |
| 777 | { |
| 778 | if (is_unique_ancestor (class_type, arg)) |
| 779 | return value_cast (type, original_arg); |
| 780 | error (_("Ambiguous dynamic_cast")); |
| 781 | } |
| 782 | |
| 783 | rtti_type = value_rtti_type (arg, &full, &top, &using_enc); |
| 784 | if (! rtti_type) |
| 785 | error (_("Couldn't determine value's most derived type for dynamic_cast")); |
| 786 | |
| 787 | /* Compute the most derived object's address. */ |
| 788 | addr = value_address (arg); |
| 789 | if (full) |
| 790 | { |
| 791 | /* Done. */ |
| 792 | } |
| 793 | else if (using_enc) |
| 794 | addr += top; |
| 795 | else |
| 796 | addr += top + value_embedded_offset (arg); |
| 797 | |
| 798 | /* dynamic_cast<void *> means to return a pointer to the |
| 799 | most-derived object. */ |
| 800 | if (TYPE_CODE (resolved_type) == TYPE_CODE_PTR |
| 801 | && TYPE_CODE (TYPE_TARGET_TYPE (resolved_type)) == TYPE_CODE_VOID) |
| 802 | return value_at_lazy (type, addr); |
| 803 | |
| 804 | tem = value_at (type, addr); |
| 805 | type = value_type (tem); |
| 806 | |
| 807 | /* The first dynamic check specified in 5.2.7. */ |
| 808 | if (is_public_ancestor (arg_type, TYPE_TARGET_TYPE (resolved_type))) |
| 809 | { |
| 810 | if (class_types_same_p (rtti_type, TYPE_TARGET_TYPE (resolved_type))) |
| 811 | return tem; |
| 812 | result = NULL; |
| 813 | if (dynamic_cast_check_1 (TYPE_TARGET_TYPE (resolved_type), |
| 814 | value_contents_for_printing (tem), |
| 815 | value_embedded_offset (tem), |
| 816 | value_address (tem), tem, |
| 817 | rtti_type, addr, |
| 818 | arg_type, |
| 819 | &result) == 1) |
| 820 | return value_cast (type, |
| 821 | is_ref |
| 822 | ? value_ref (result, TYPE_CODE (resolved_type)) |
| 823 | : value_addr (result)); |
| 824 | } |
| 825 | |
| 826 | /* The second dynamic check specified in 5.2.7. */ |
| 827 | result = NULL; |
| 828 | if (is_public_ancestor (arg_type, rtti_type) |
| 829 | && dynamic_cast_check_2 (TYPE_TARGET_TYPE (resolved_type), |
| 830 | value_contents_for_printing (tem), |
| 831 | value_embedded_offset (tem), |
| 832 | value_address (tem), tem, |
| 833 | rtti_type, &result) == 1) |
| 834 | return value_cast (type, |
| 835 | is_ref |
| 836 | ? value_ref (result, TYPE_CODE (resolved_type)) |
| 837 | : value_addr (result)); |
| 838 | |
| 839 | if (TYPE_CODE (resolved_type) == TYPE_CODE_PTR) |
| 840 | return value_zero (type, not_lval); |
| 841 | |
| 842 | error (_("dynamic_cast failed")); |
| 843 | } |
| 844 | |
| 845 | /* Create a value of type TYPE that is zero, and return it. */ |
| 846 | |
| 847 | struct value * |
| 848 | value_zero (struct type *type, enum lval_type lv) |
| 849 | { |
| 850 | struct value *val = allocate_value (type); |
| 851 | |
| 852 | VALUE_LVAL (val) = (lv == lval_computed ? not_lval : lv); |
| 853 | return val; |
| 854 | } |
| 855 | |
| 856 | /* Create a not_lval value of numeric type TYPE that is one, and return it. */ |
| 857 | |
| 858 | struct value * |
| 859 | value_one (struct type *type) |
| 860 | { |
| 861 | struct type *type1 = check_typedef (type); |
| 862 | struct value *val; |
| 863 | |
| 864 | if (is_integral_type (type1) || is_floating_type (type1)) |
| 865 | { |
| 866 | val = value_from_longest (type, (LONGEST) 1); |
| 867 | } |
| 868 | else if (TYPE_CODE (type1) == TYPE_CODE_ARRAY && TYPE_VECTOR (type1)) |
| 869 | { |
| 870 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type1)); |
| 871 | int i; |
| 872 | LONGEST low_bound, high_bound; |
| 873 | struct value *tmp; |
| 874 | |
| 875 | if (!get_array_bounds (type1, &low_bound, &high_bound)) |
| 876 | error (_("Could not determine the vector bounds")); |
| 877 | |
| 878 | val = allocate_value (type); |
| 879 | for (i = 0; i < high_bound - low_bound + 1; i++) |
| 880 | { |
| 881 | tmp = value_one (eltype); |
| 882 | memcpy (value_contents_writeable (val) + i * TYPE_LENGTH (eltype), |
| 883 | value_contents_all (tmp), TYPE_LENGTH (eltype)); |
| 884 | } |
| 885 | } |
| 886 | else |
| 887 | { |
| 888 | error (_("Not a numeric type.")); |
| 889 | } |
| 890 | |
| 891 | /* value_one result is never used for assignments to. */ |
| 892 | gdb_assert (VALUE_LVAL (val) == not_lval); |
| 893 | |
| 894 | return val; |
| 895 | } |
| 896 | |
| 897 | /* Helper function for value_at, value_at_lazy, and value_at_lazy_stack. |
| 898 | The type of the created value may differ from the passed type TYPE. |
| 899 | Make sure to retrieve the returned values's new type after this call |
| 900 | e.g. in case the type is a variable length array. */ |
| 901 | |
| 902 | static struct value * |
| 903 | get_value_at (struct type *type, CORE_ADDR addr, int lazy) |
| 904 | { |
| 905 | struct value *val; |
| 906 | |
| 907 | if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID) |
| 908 | error (_("Attempt to dereference a generic pointer.")); |
| 909 | |
| 910 | val = value_from_contents_and_address (type, NULL, addr); |
| 911 | |
| 912 | if (!lazy) |
| 913 | value_fetch_lazy (val); |
| 914 | |
| 915 | return val; |
| 916 | } |
| 917 | |
| 918 | /* Return a value with type TYPE located at ADDR. |
| 919 | |
| 920 | Call value_at only if the data needs to be fetched immediately; |
| 921 | if we can be 'lazy' and defer the fetch, perhaps indefinately, call |
| 922 | value_at_lazy instead. value_at_lazy simply records the address of |
| 923 | the data and sets the lazy-evaluation-required flag. The lazy flag |
| 924 | is tested in the value_contents macro, which is used if and when |
| 925 | the contents are actually required. The type of the created value |
| 926 | may differ from the passed type TYPE. Make sure to retrieve the |
| 927 | returned values's new type after this call e.g. in case the type |
| 928 | is a variable length array. |
| 929 | |
| 930 | Note: value_at does *NOT* handle embedded offsets; perform such |
| 931 | adjustments before or after calling it. */ |
| 932 | |
| 933 | struct value * |
| 934 | value_at (struct type *type, CORE_ADDR addr) |
| 935 | { |
| 936 | return get_value_at (type, addr, 0); |
| 937 | } |
| 938 | |
| 939 | /* Return a lazy value with type TYPE located at ADDR (cf. value_at). |
| 940 | The type of the created value may differ from the passed type TYPE. |
| 941 | Make sure to retrieve the returned values's new type after this call |
| 942 | e.g. in case the type is a variable length array. */ |
| 943 | |
| 944 | struct value * |
| 945 | value_at_lazy (struct type *type, CORE_ADDR addr) |
| 946 | { |
| 947 | return get_value_at (type, addr, 1); |
| 948 | } |
| 949 | |
| 950 | void |
| 951 | read_value_memory (struct value *val, LONGEST bit_offset, |
| 952 | int stack, CORE_ADDR memaddr, |
| 953 | gdb_byte *buffer, size_t length) |
| 954 | { |
| 955 | ULONGEST xfered_total = 0; |
| 956 | struct gdbarch *arch = get_value_arch (val); |
| 957 | int unit_size = gdbarch_addressable_memory_unit_size (arch); |
| 958 | enum target_object object; |
| 959 | |
| 960 | object = stack ? TARGET_OBJECT_STACK_MEMORY : TARGET_OBJECT_MEMORY; |
| 961 | |
| 962 | while (xfered_total < length) |
| 963 | { |
| 964 | enum target_xfer_status status; |
| 965 | ULONGEST xfered_partial; |
| 966 | |
| 967 | status = target_xfer_partial (target_stack, |
| 968 | object, NULL, |
| 969 | buffer + xfered_total * unit_size, NULL, |
| 970 | memaddr + xfered_total, |
| 971 | length - xfered_total, |
| 972 | &xfered_partial); |
| 973 | |
| 974 | if (status == TARGET_XFER_OK) |
| 975 | /* nothing */; |
| 976 | else if (status == TARGET_XFER_UNAVAILABLE) |
| 977 | mark_value_bits_unavailable (val, (xfered_total * HOST_CHAR_BIT |
| 978 | + bit_offset), |
| 979 | xfered_partial * HOST_CHAR_BIT); |
| 980 | else if (status == TARGET_XFER_EOF) |
| 981 | memory_error (TARGET_XFER_E_IO, memaddr + xfered_total); |
| 982 | else |
| 983 | memory_error (status, memaddr + xfered_total); |
| 984 | |
| 985 | xfered_total += xfered_partial; |
| 986 | QUIT; |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | /* Store the contents of FROMVAL into the location of TOVAL. |
| 991 | Return a new value with the location of TOVAL and contents of FROMVAL. */ |
| 992 | |
| 993 | struct value * |
| 994 | value_assign (struct value *toval, struct value *fromval) |
| 995 | { |
| 996 | struct type *type; |
| 997 | struct value *val; |
| 998 | struct frame_id old_frame; |
| 999 | |
| 1000 | if (!deprecated_value_modifiable (toval)) |
| 1001 | error (_("Left operand of assignment is not a modifiable lvalue.")); |
| 1002 | |
| 1003 | toval = coerce_ref (toval); |
| 1004 | |
| 1005 | type = value_type (toval); |
| 1006 | if (VALUE_LVAL (toval) != lval_internalvar) |
| 1007 | fromval = value_cast (type, fromval); |
| 1008 | else |
| 1009 | { |
| 1010 | /* Coerce arrays and functions to pointers, except for arrays |
| 1011 | which only live in GDB's storage. */ |
| 1012 | if (!value_must_coerce_to_target (fromval)) |
| 1013 | fromval = coerce_array (fromval); |
| 1014 | } |
| 1015 | |
| 1016 | type = check_typedef (type); |
| 1017 | |
| 1018 | /* Since modifying a register can trash the frame chain, and |
| 1019 | modifying memory can trash the frame cache, we save the old frame |
| 1020 | and then restore the new frame afterwards. */ |
| 1021 | old_frame = get_frame_id (deprecated_safe_get_selected_frame ()); |
| 1022 | |
| 1023 | switch (VALUE_LVAL (toval)) |
| 1024 | { |
| 1025 | case lval_internalvar: |
| 1026 | set_internalvar (VALUE_INTERNALVAR (toval), fromval); |
| 1027 | return value_of_internalvar (get_type_arch (type), |
| 1028 | VALUE_INTERNALVAR (toval)); |
| 1029 | |
| 1030 | case lval_internalvar_component: |
| 1031 | { |
| 1032 | LONGEST offset = value_offset (toval); |
| 1033 | |
| 1034 | /* Are we dealing with a bitfield? |
| 1035 | |
| 1036 | It is important to mention that `value_parent (toval)' is |
| 1037 | non-NULL iff `value_bitsize (toval)' is non-zero. */ |
| 1038 | if (value_bitsize (toval)) |
| 1039 | { |
| 1040 | /* VALUE_INTERNALVAR below refers to the parent value, while |
| 1041 | the offset is relative to this parent value. */ |
| 1042 | gdb_assert (value_parent (value_parent (toval)) == NULL); |
| 1043 | offset += value_offset (value_parent (toval)); |
| 1044 | } |
| 1045 | |
| 1046 | set_internalvar_component (VALUE_INTERNALVAR (toval), |
| 1047 | offset, |
| 1048 | value_bitpos (toval), |
| 1049 | value_bitsize (toval), |
| 1050 | fromval); |
| 1051 | } |
| 1052 | break; |
| 1053 | |
| 1054 | case lval_memory: |
| 1055 | { |
| 1056 | const gdb_byte *dest_buffer; |
| 1057 | CORE_ADDR changed_addr; |
| 1058 | int changed_len; |
| 1059 | gdb_byte buffer[sizeof (LONGEST)]; |
| 1060 | |
| 1061 | if (value_bitsize (toval)) |
| 1062 | { |
| 1063 | struct value *parent = value_parent (toval); |
| 1064 | |
| 1065 | changed_addr = value_address (parent) + value_offset (toval); |
| 1066 | changed_len = (value_bitpos (toval) |
| 1067 | + value_bitsize (toval) |
| 1068 | + HOST_CHAR_BIT - 1) |
| 1069 | / HOST_CHAR_BIT; |
| 1070 | |
| 1071 | /* If we can read-modify-write exactly the size of the |
| 1072 | containing type (e.g. short or int) then do so. This |
| 1073 | is safer for volatile bitfields mapped to hardware |
| 1074 | registers. */ |
| 1075 | if (changed_len < TYPE_LENGTH (type) |
| 1076 | && TYPE_LENGTH (type) <= (int) sizeof (LONGEST) |
| 1077 | && ((LONGEST) changed_addr % TYPE_LENGTH (type)) == 0) |
| 1078 | changed_len = TYPE_LENGTH (type); |
| 1079 | |
| 1080 | if (changed_len > (int) sizeof (LONGEST)) |
| 1081 | error (_("Can't handle bitfields which " |
| 1082 | "don't fit in a %d bit word."), |
| 1083 | (int) sizeof (LONGEST) * HOST_CHAR_BIT); |
| 1084 | |
| 1085 | read_memory (changed_addr, buffer, changed_len); |
| 1086 | modify_field (type, buffer, value_as_long (fromval), |
| 1087 | value_bitpos (toval), value_bitsize (toval)); |
| 1088 | dest_buffer = buffer; |
| 1089 | } |
| 1090 | else |
| 1091 | { |
| 1092 | changed_addr = value_address (toval); |
| 1093 | changed_len = type_length_units (type); |
| 1094 | dest_buffer = value_contents (fromval); |
| 1095 | } |
| 1096 | |
| 1097 | write_memory_with_notification (changed_addr, dest_buffer, changed_len); |
| 1098 | } |
| 1099 | break; |
| 1100 | |
| 1101 | case lval_register: |
| 1102 | { |
| 1103 | struct frame_info *frame; |
| 1104 | struct gdbarch *gdbarch; |
| 1105 | int value_reg; |
| 1106 | |
| 1107 | /* Figure out which frame this is in currently. |
| 1108 | |
| 1109 | We use VALUE_FRAME_ID for obtaining the value's frame id instead of |
| 1110 | VALUE_NEXT_FRAME_ID due to requiring a frame which may be passed to |
| 1111 | put_frame_register_bytes() below. That function will (eventually) |
| 1112 | perform the necessary unwind operation by first obtaining the next |
| 1113 | frame. */ |
| 1114 | frame = frame_find_by_id (VALUE_FRAME_ID (toval)); |
| 1115 | |
| 1116 | value_reg = VALUE_REGNUM (toval); |
| 1117 | |
| 1118 | if (!frame) |
| 1119 | error (_("Value being assigned to is no longer active.")); |
| 1120 | |
| 1121 | gdbarch = get_frame_arch (frame); |
| 1122 | |
| 1123 | if (value_bitsize (toval)) |
| 1124 | { |
| 1125 | struct value *parent = value_parent (toval); |
| 1126 | LONGEST offset = value_offset (parent) + value_offset (toval); |
| 1127 | int changed_len; |
| 1128 | gdb_byte buffer[sizeof (LONGEST)]; |
| 1129 | int optim, unavail; |
| 1130 | |
| 1131 | changed_len = (value_bitpos (toval) |
| 1132 | + value_bitsize (toval) |
| 1133 | + HOST_CHAR_BIT - 1) |
| 1134 | / HOST_CHAR_BIT; |
| 1135 | |
| 1136 | if (changed_len > (int) sizeof (LONGEST)) |
| 1137 | error (_("Can't handle bitfields which " |
| 1138 | "don't fit in a %d bit word."), |
| 1139 | (int) sizeof (LONGEST) * HOST_CHAR_BIT); |
| 1140 | |
| 1141 | if (!get_frame_register_bytes (frame, value_reg, offset, |
| 1142 | changed_len, buffer, |
| 1143 | &optim, &unavail)) |
| 1144 | { |
| 1145 | if (optim) |
| 1146 | throw_error (OPTIMIZED_OUT_ERROR, |
| 1147 | _("value has been optimized out")); |
| 1148 | if (unavail) |
| 1149 | throw_error (NOT_AVAILABLE_ERROR, |
| 1150 | _("value is not available")); |
| 1151 | } |
| 1152 | |
| 1153 | modify_field (type, buffer, value_as_long (fromval), |
| 1154 | value_bitpos (toval), value_bitsize (toval)); |
| 1155 | |
| 1156 | put_frame_register_bytes (frame, value_reg, offset, |
| 1157 | changed_len, buffer); |
| 1158 | } |
| 1159 | else |
| 1160 | { |
| 1161 | if (gdbarch_convert_register_p (gdbarch, VALUE_REGNUM (toval), |
| 1162 | type)) |
| 1163 | { |
| 1164 | /* If TOVAL is a special machine register requiring |
| 1165 | conversion of program values to a special raw |
| 1166 | format. */ |
| 1167 | gdbarch_value_to_register (gdbarch, frame, |
| 1168 | VALUE_REGNUM (toval), type, |
| 1169 | value_contents (fromval)); |
| 1170 | } |
| 1171 | else |
| 1172 | { |
| 1173 | put_frame_register_bytes (frame, value_reg, |
| 1174 | value_offset (toval), |
| 1175 | TYPE_LENGTH (type), |
| 1176 | value_contents (fromval)); |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | gdb::observers::register_changed.notify (frame, value_reg); |
| 1181 | break; |
| 1182 | } |
| 1183 | |
| 1184 | case lval_computed: |
| 1185 | { |
| 1186 | const struct lval_funcs *funcs = value_computed_funcs (toval); |
| 1187 | |
| 1188 | if (funcs->write != NULL) |
| 1189 | { |
| 1190 | funcs->write (toval, fromval); |
| 1191 | break; |
| 1192 | } |
| 1193 | } |
| 1194 | /* Fall through. */ |
| 1195 | |
| 1196 | default: |
| 1197 | error (_("Left operand of assignment is not an lvalue.")); |
| 1198 | } |
| 1199 | |
| 1200 | /* Assigning to the stack pointer, frame pointer, and other |
| 1201 | (architecture and calling convention specific) registers may |
| 1202 | cause the frame cache and regcache to be out of date. Assigning to memory |
| 1203 | also can. We just do this on all assignments to registers or |
| 1204 | memory, for simplicity's sake; I doubt the slowdown matters. */ |
| 1205 | switch (VALUE_LVAL (toval)) |
| 1206 | { |
| 1207 | case lval_memory: |
| 1208 | case lval_register: |
| 1209 | case lval_computed: |
| 1210 | |
| 1211 | gdb::observers::target_changed.notify (target_stack); |
| 1212 | |
| 1213 | /* Having destroyed the frame cache, restore the selected |
| 1214 | frame. */ |
| 1215 | |
| 1216 | /* FIXME: cagney/2002-11-02: There has to be a better way of |
| 1217 | doing this. Instead of constantly saving/restoring the |
| 1218 | frame. Why not create a get_selected_frame() function that, |
| 1219 | having saved the selected frame's ID can automatically |
| 1220 | re-find the previously selected frame automatically. */ |
| 1221 | |
| 1222 | { |
| 1223 | struct frame_info *fi = frame_find_by_id (old_frame); |
| 1224 | |
| 1225 | if (fi != NULL) |
| 1226 | select_frame (fi); |
| 1227 | } |
| 1228 | |
| 1229 | break; |
| 1230 | default: |
| 1231 | break; |
| 1232 | } |
| 1233 | |
| 1234 | /* If the field does not entirely fill a LONGEST, then zero the sign |
| 1235 | bits. If the field is signed, and is negative, then sign |
| 1236 | extend. */ |
| 1237 | if ((value_bitsize (toval) > 0) |
| 1238 | && (value_bitsize (toval) < 8 * (int) sizeof (LONGEST))) |
| 1239 | { |
| 1240 | LONGEST fieldval = value_as_long (fromval); |
| 1241 | LONGEST valmask = (((ULONGEST) 1) << value_bitsize (toval)) - 1; |
| 1242 | |
| 1243 | fieldval &= valmask; |
| 1244 | if (!TYPE_UNSIGNED (type) |
| 1245 | && (fieldval & (valmask ^ (valmask >> 1)))) |
| 1246 | fieldval |= ~valmask; |
| 1247 | |
| 1248 | fromval = value_from_longest (type, fieldval); |
| 1249 | } |
| 1250 | |
| 1251 | /* The return value is a copy of TOVAL so it shares its location |
| 1252 | information, but its contents are updated from FROMVAL. This |
| 1253 | implies the returned value is not lazy, even if TOVAL was. */ |
| 1254 | val = value_copy (toval); |
| 1255 | set_value_lazy (val, 0); |
| 1256 | memcpy (value_contents_raw (val), value_contents (fromval), |
| 1257 | TYPE_LENGTH (type)); |
| 1258 | |
| 1259 | /* We copy over the enclosing type and pointed-to offset from FROMVAL |
| 1260 | in the case of pointer types. For object types, the enclosing type |
| 1261 | and embedded offset must *not* be copied: the target object refered |
| 1262 | to by TOVAL retains its original dynamic type after assignment. */ |
| 1263 | if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 1264 | { |
| 1265 | set_value_enclosing_type (val, value_enclosing_type (fromval)); |
| 1266 | set_value_pointed_to_offset (val, value_pointed_to_offset (fromval)); |
| 1267 | } |
| 1268 | |
| 1269 | return val; |
| 1270 | } |
| 1271 | |
| 1272 | /* Extend a value VAL to COUNT repetitions of its type. */ |
| 1273 | |
| 1274 | struct value * |
| 1275 | value_repeat (struct value *arg1, int count) |
| 1276 | { |
| 1277 | struct value *val; |
| 1278 | |
| 1279 | if (VALUE_LVAL (arg1) != lval_memory) |
| 1280 | error (_("Only values in memory can be extended with '@'.")); |
| 1281 | if (count < 1) |
| 1282 | error (_("Invalid number %d of repetitions."), count); |
| 1283 | |
| 1284 | val = allocate_repeat_value (value_enclosing_type (arg1), count); |
| 1285 | |
| 1286 | VALUE_LVAL (val) = lval_memory; |
| 1287 | set_value_address (val, value_address (arg1)); |
| 1288 | |
| 1289 | read_value_memory (val, 0, value_stack (val), value_address (val), |
| 1290 | value_contents_all_raw (val), |
| 1291 | type_length_units (value_enclosing_type (val))); |
| 1292 | |
| 1293 | return val; |
| 1294 | } |
| 1295 | |
| 1296 | struct value * |
| 1297 | value_of_variable (struct symbol *var, const struct block *b) |
| 1298 | { |
| 1299 | struct frame_info *frame = NULL; |
| 1300 | |
| 1301 | if (symbol_read_needs_frame (var)) |
| 1302 | frame = get_selected_frame (_("No frame selected.")); |
| 1303 | |
| 1304 | return read_var_value (var, b, frame); |
| 1305 | } |
| 1306 | |
| 1307 | struct value * |
| 1308 | address_of_variable (struct symbol *var, const struct block *b) |
| 1309 | { |
| 1310 | struct type *type = SYMBOL_TYPE (var); |
| 1311 | struct value *val; |
| 1312 | |
| 1313 | /* Evaluate it first; if the result is a memory address, we're fine. |
| 1314 | Lazy evaluation pays off here. */ |
| 1315 | |
| 1316 | val = value_of_variable (var, b); |
| 1317 | type = value_type (val); |
| 1318 | |
| 1319 | if ((VALUE_LVAL (val) == lval_memory && value_lazy (val)) |
| 1320 | || TYPE_CODE (type) == TYPE_CODE_FUNC) |
| 1321 | { |
| 1322 | CORE_ADDR addr = value_address (val); |
| 1323 | |
| 1324 | return value_from_pointer (lookup_pointer_type (type), addr); |
| 1325 | } |
| 1326 | |
| 1327 | /* Not a memory address; check what the problem was. */ |
| 1328 | switch (VALUE_LVAL (val)) |
| 1329 | { |
| 1330 | case lval_register: |
| 1331 | { |
| 1332 | struct frame_info *frame; |
| 1333 | const char *regname; |
| 1334 | |
| 1335 | frame = frame_find_by_id (VALUE_NEXT_FRAME_ID (val)); |
| 1336 | gdb_assert (frame); |
| 1337 | |
| 1338 | regname = gdbarch_register_name (get_frame_arch (frame), |
| 1339 | VALUE_REGNUM (val)); |
| 1340 | gdb_assert (regname && *regname); |
| 1341 | |
| 1342 | error (_("Address requested for identifier " |
| 1343 | "\"%s\" which is in register $%s"), |
| 1344 | SYMBOL_PRINT_NAME (var), regname); |
| 1345 | break; |
| 1346 | } |
| 1347 | |
| 1348 | default: |
| 1349 | error (_("Can't take address of \"%s\" which isn't an lvalue."), |
| 1350 | SYMBOL_PRINT_NAME (var)); |
| 1351 | break; |
| 1352 | } |
| 1353 | |
| 1354 | return val; |
| 1355 | } |
| 1356 | |
| 1357 | /* Return one if VAL does not live in target memory, but should in order |
| 1358 | to operate on it. Otherwise return zero. */ |
| 1359 | |
| 1360 | int |
| 1361 | value_must_coerce_to_target (struct value *val) |
| 1362 | { |
| 1363 | struct type *valtype; |
| 1364 | |
| 1365 | /* The only lval kinds which do not live in target memory. */ |
| 1366 | if (VALUE_LVAL (val) != not_lval |
| 1367 | && VALUE_LVAL (val) != lval_internalvar |
| 1368 | && VALUE_LVAL (val) != lval_xcallable) |
| 1369 | return 0; |
| 1370 | |
| 1371 | valtype = check_typedef (value_type (val)); |
| 1372 | |
| 1373 | switch (TYPE_CODE (valtype)) |
| 1374 | { |
| 1375 | case TYPE_CODE_ARRAY: |
| 1376 | return TYPE_VECTOR (valtype) ? 0 : 1; |
| 1377 | case TYPE_CODE_STRING: |
| 1378 | return 1; |
| 1379 | default: |
| 1380 | return 0; |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | /* Make sure that VAL lives in target memory if it's supposed to. For |
| 1385 | instance, strings are constructed as character arrays in GDB's |
| 1386 | storage, and this function copies them to the target. */ |
| 1387 | |
| 1388 | struct value * |
| 1389 | value_coerce_to_target (struct value *val) |
| 1390 | { |
| 1391 | LONGEST length; |
| 1392 | CORE_ADDR addr; |
| 1393 | |
| 1394 | if (!value_must_coerce_to_target (val)) |
| 1395 | return val; |
| 1396 | |
| 1397 | length = TYPE_LENGTH (check_typedef (value_type (val))); |
| 1398 | addr = allocate_space_in_inferior (length); |
| 1399 | write_memory (addr, value_contents (val), length); |
| 1400 | return value_at_lazy (value_type (val), addr); |
| 1401 | } |
| 1402 | |
| 1403 | /* Given a value which is an array, return a value which is a pointer |
| 1404 | to its first element, regardless of whether or not the array has a |
| 1405 | nonzero lower bound. |
| 1406 | |
| 1407 | FIXME: A previous comment here indicated that this routine should |
| 1408 | be substracting the array's lower bound. It's not clear to me that |
| 1409 | this is correct. Given an array subscripting operation, it would |
| 1410 | certainly work to do the adjustment here, essentially computing: |
| 1411 | |
| 1412 | (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0]) |
| 1413 | |
| 1414 | However I believe a more appropriate and logical place to account |
| 1415 | for the lower bound is to do so in value_subscript, essentially |
| 1416 | computing: |
| 1417 | |
| 1418 | (&array[0] + ((index - lowerbound) * sizeof array[0])) |
| 1419 | |
| 1420 | As further evidence consider what would happen with operations |
| 1421 | other than array subscripting, where the caller would get back a |
| 1422 | value that had an address somewhere before the actual first element |
| 1423 | of the array, and the information about the lower bound would be |
| 1424 | lost because of the coercion to pointer type. */ |
| 1425 | |
| 1426 | struct value * |
| 1427 | value_coerce_array (struct value *arg1) |
| 1428 | { |
| 1429 | struct type *type = check_typedef (value_type (arg1)); |
| 1430 | |
| 1431 | /* If the user tries to do something requiring a pointer with an |
| 1432 | array that has not yet been pushed to the target, then this would |
| 1433 | be a good time to do so. */ |
| 1434 | arg1 = value_coerce_to_target (arg1); |
| 1435 | |
| 1436 | if (VALUE_LVAL (arg1) != lval_memory) |
| 1437 | error (_("Attempt to take address of value not located in memory.")); |
| 1438 | |
| 1439 | return value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)), |
| 1440 | value_address (arg1)); |
| 1441 | } |
| 1442 | |
| 1443 | /* Given a value which is a function, return a value which is a pointer |
| 1444 | to it. */ |
| 1445 | |
| 1446 | struct value * |
| 1447 | value_coerce_function (struct value *arg1) |
| 1448 | { |
| 1449 | struct value *retval; |
| 1450 | |
| 1451 | if (VALUE_LVAL (arg1) != lval_memory) |
| 1452 | error (_("Attempt to take address of value not located in memory.")); |
| 1453 | |
| 1454 | retval = value_from_pointer (lookup_pointer_type (value_type (arg1)), |
| 1455 | value_address (arg1)); |
| 1456 | return retval; |
| 1457 | } |
| 1458 | |
| 1459 | /* Return a pointer value for the object for which ARG1 is the |
| 1460 | contents. */ |
| 1461 | |
| 1462 | struct value * |
| 1463 | value_addr (struct value *arg1) |
| 1464 | { |
| 1465 | struct value *arg2; |
| 1466 | struct type *type = check_typedef (value_type (arg1)); |
| 1467 | |
| 1468 | if (TYPE_IS_REFERENCE (type)) |
| 1469 | { |
| 1470 | if (value_bits_synthetic_pointer (arg1, value_embedded_offset (arg1), |
| 1471 | TARGET_CHAR_BIT * TYPE_LENGTH (type))) |
| 1472 | arg1 = coerce_ref (arg1); |
| 1473 | else |
| 1474 | { |
| 1475 | /* Copy the value, but change the type from (T&) to (T*). We |
| 1476 | keep the same location information, which is efficient, and |
| 1477 | allows &(&X) to get the location containing the reference. |
| 1478 | Do the same to its enclosing type for consistency. */ |
| 1479 | struct type *type_ptr |
| 1480 | = lookup_pointer_type (TYPE_TARGET_TYPE (type)); |
| 1481 | struct type *enclosing_type |
| 1482 | = check_typedef (value_enclosing_type (arg1)); |
| 1483 | struct type *enclosing_type_ptr |
| 1484 | = lookup_pointer_type (TYPE_TARGET_TYPE (enclosing_type)); |
| 1485 | |
| 1486 | arg2 = value_copy (arg1); |
| 1487 | deprecated_set_value_type (arg2, type_ptr); |
| 1488 | set_value_enclosing_type (arg2, enclosing_type_ptr); |
| 1489 | |
| 1490 | return arg2; |
| 1491 | } |
| 1492 | } |
| 1493 | if (TYPE_CODE (type) == TYPE_CODE_FUNC) |
| 1494 | return value_coerce_function (arg1); |
| 1495 | |
| 1496 | /* If this is an array that has not yet been pushed to the target, |
| 1497 | then this would be a good time to force it to memory. */ |
| 1498 | arg1 = value_coerce_to_target (arg1); |
| 1499 | |
| 1500 | if (VALUE_LVAL (arg1) != lval_memory) |
| 1501 | error (_("Attempt to take address of value not located in memory.")); |
| 1502 | |
| 1503 | /* Get target memory address. */ |
| 1504 | arg2 = value_from_pointer (lookup_pointer_type (value_type (arg1)), |
| 1505 | (value_address (arg1) |
| 1506 | + value_embedded_offset (arg1))); |
| 1507 | |
| 1508 | /* This may be a pointer to a base subobject; so remember the |
| 1509 | full derived object's type ... */ |
| 1510 | set_value_enclosing_type (arg2, |
| 1511 | lookup_pointer_type (value_enclosing_type (arg1))); |
| 1512 | /* ... and also the relative position of the subobject in the full |
| 1513 | object. */ |
| 1514 | set_value_pointed_to_offset (arg2, value_embedded_offset (arg1)); |
| 1515 | return arg2; |
| 1516 | } |
| 1517 | |
| 1518 | /* Return a reference value for the object for which ARG1 is the |
| 1519 | contents. */ |
| 1520 | |
| 1521 | struct value * |
| 1522 | value_ref (struct value *arg1, enum type_code refcode) |
| 1523 | { |
| 1524 | struct value *arg2; |
| 1525 | struct type *type = check_typedef (value_type (arg1)); |
| 1526 | |
| 1527 | gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF); |
| 1528 | |
| 1529 | if ((TYPE_CODE (type) == TYPE_CODE_REF |
| 1530 | || TYPE_CODE (type) == TYPE_CODE_RVALUE_REF) |
| 1531 | && TYPE_CODE (type) == refcode) |
| 1532 | return arg1; |
| 1533 | |
| 1534 | arg2 = value_addr (arg1); |
| 1535 | deprecated_set_value_type (arg2, lookup_reference_type (type, refcode)); |
| 1536 | return arg2; |
| 1537 | } |
| 1538 | |
| 1539 | /* Given a value of a pointer type, apply the C unary * operator to |
| 1540 | it. */ |
| 1541 | |
| 1542 | struct value * |
| 1543 | value_ind (struct value *arg1) |
| 1544 | { |
| 1545 | struct type *base_type; |
| 1546 | struct value *arg2; |
| 1547 | |
| 1548 | arg1 = coerce_array (arg1); |
| 1549 | |
| 1550 | base_type = check_typedef (value_type (arg1)); |
| 1551 | |
| 1552 | if (VALUE_LVAL (arg1) == lval_computed) |
| 1553 | { |
| 1554 | const struct lval_funcs *funcs = value_computed_funcs (arg1); |
| 1555 | |
| 1556 | if (funcs->indirect) |
| 1557 | { |
| 1558 | struct value *result = funcs->indirect (arg1); |
| 1559 | |
| 1560 | if (result) |
| 1561 | return result; |
| 1562 | } |
| 1563 | } |
| 1564 | |
| 1565 | if (TYPE_CODE (base_type) == TYPE_CODE_PTR) |
| 1566 | { |
| 1567 | struct type *enc_type; |
| 1568 | |
| 1569 | /* We may be pointing to something embedded in a larger object. |
| 1570 | Get the real type of the enclosing object. */ |
| 1571 | enc_type = check_typedef (value_enclosing_type (arg1)); |
| 1572 | enc_type = TYPE_TARGET_TYPE (enc_type); |
| 1573 | |
| 1574 | if (TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_FUNC |
| 1575 | || TYPE_CODE (check_typedef (enc_type)) == TYPE_CODE_METHOD) |
| 1576 | /* For functions, go through find_function_addr, which knows |
| 1577 | how to handle function descriptors. */ |
| 1578 | arg2 = value_at_lazy (enc_type, |
| 1579 | find_function_addr (arg1, NULL)); |
| 1580 | else |
| 1581 | /* Retrieve the enclosing object pointed to. */ |
| 1582 | arg2 = value_at_lazy (enc_type, |
| 1583 | (value_as_address (arg1) |
| 1584 | - value_pointed_to_offset (arg1))); |
| 1585 | |
| 1586 | enc_type = value_type (arg2); |
| 1587 | return readjust_indirect_value_type (arg2, enc_type, base_type, arg1); |
| 1588 | } |
| 1589 | |
| 1590 | error (_("Attempt to take contents of a non-pointer value.")); |
| 1591 | return 0; /* For lint -- never reached. */ |
| 1592 | } |
| 1593 | \f |
| 1594 | /* Create a value for an array by allocating space in GDB, copying the |
| 1595 | data into that space, and then setting up an array value. |
| 1596 | |
| 1597 | The array bounds are set from LOWBOUND and HIGHBOUND, and the array |
| 1598 | is populated from the values passed in ELEMVEC. |
| 1599 | |
| 1600 | The element type of the array is inherited from the type of the |
| 1601 | first element, and all elements must have the same size (though we |
| 1602 | don't currently enforce any restriction on their types). */ |
| 1603 | |
| 1604 | struct value * |
| 1605 | value_array (int lowbound, int highbound, struct value **elemvec) |
| 1606 | { |
| 1607 | int nelem; |
| 1608 | int idx; |
| 1609 | ULONGEST typelength; |
| 1610 | struct value *val; |
| 1611 | struct type *arraytype; |
| 1612 | |
| 1613 | /* Validate that the bounds are reasonable and that each of the |
| 1614 | elements have the same size. */ |
| 1615 | |
| 1616 | nelem = highbound - lowbound + 1; |
| 1617 | if (nelem <= 0) |
| 1618 | { |
| 1619 | error (_("bad array bounds (%d, %d)"), lowbound, highbound); |
| 1620 | } |
| 1621 | typelength = type_length_units (value_enclosing_type (elemvec[0])); |
| 1622 | for (idx = 1; idx < nelem; idx++) |
| 1623 | { |
| 1624 | if (type_length_units (value_enclosing_type (elemvec[idx])) |
| 1625 | != typelength) |
| 1626 | { |
| 1627 | error (_("array elements must all be the same size")); |
| 1628 | } |
| 1629 | } |
| 1630 | |
| 1631 | arraytype = lookup_array_range_type (value_enclosing_type (elemvec[0]), |
| 1632 | lowbound, highbound); |
| 1633 | |
| 1634 | if (!current_language->c_style_arrays) |
| 1635 | { |
| 1636 | val = allocate_value (arraytype); |
| 1637 | for (idx = 0; idx < nelem; idx++) |
| 1638 | value_contents_copy (val, idx * typelength, elemvec[idx], 0, |
| 1639 | typelength); |
| 1640 | return val; |
| 1641 | } |
| 1642 | |
| 1643 | /* Allocate space to store the array, and then initialize it by |
| 1644 | copying in each element. */ |
| 1645 | |
| 1646 | val = allocate_value (arraytype); |
| 1647 | for (idx = 0; idx < nelem; idx++) |
| 1648 | value_contents_copy (val, idx * typelength, elemvec[idx], 0, typelength); |
| 1649 | return val; |
| 1650 | } |
| 1651 | |
| 1652 | struct value * |
| 1653 | value_cstring (const char *ptr, ssize_t len, struct type *char_type) |
| 1654 | { |
| 1655 | struct value *val; |
| 1656 | int lowbound = current_language->string_lower_bound; |
| 1657 | ssize_t highbound = len / TYPE_LENGTH (char_type); |
| 1658 | struct type *stringtype |
| 1659 | = lookup_array_range_type (char_type, lowbound, highbound + lowbound - 1); |
| 1660 | |
| 1661 | val = allocate_value (stringtype); |
| 1662 | memcpy (value_contents_raw (val), ptr, len); |
| 1663 | return val; |
| 1664 | } |
| 1665 | |
| 1666 | /* Create a value for a string constant by allocating space in the |
| 1667 | inferior, copying the data into that space, and returning the |
| 1668 | address with type TYPE_CODE_STRING. PTR points to the string |
| 1669 | constant data; LEN is number of characters. |
| 1670 | |
| 1671 | Note that string types are like array of char types with a lower |
| 1672 | bound of zero and an upper bound of LEN - 1. Also note that the |
| 1673 | string may contain embedded null bytes. */ |
| 1674 | |
| 1675 | struct value * |
| 1676 | value_string (const char *ptr, ssize_t len, struct type *char_type) |
| 1677 | { |
| 1678 | struct value *val; |
| 1679 | int lowbound = current_language->string_lower_bound; |
| 1680 | ssize_t highbound = len / TYPE_LENGTH (char_type); |
| 1681 | struct type *stringtype |
| 1682 | = lookup_string_range_type (char_type, lowbound, highbound + lowbound - 1); |
| 1683 | |
| 1684 | val = allocate_value (stringtype); |
| 1685 | memcpy (value_contents_raw (val), ptr, len); |
| 1686 | return val; |
| 1687 | } |
| 1688 | |
| 1689 | \f |
| 1690 | /* See if we can pass arguments in T2 to a function which takes |
| 1691 | arguments of types T1. T1 is a list of NARGS arguments, and T2 is |
| 1692 | a NULL-terminated vector. If some arguments need coercion of some |
| 1693 | sort, then the coerced values are written into T2. Return value is |
| 1694 | 0 if the arguments could be matched, or the position at which they |
| 1695 | differ if not. |
| 1696 | |
| 1697 | STATICP is nonzero if the T1 argument list came from a static |
| 1698 | member function. T2 will still include the ``this'' pointer, but |
| 1699 | it will be skipped. |
| 1700 | |
| 1701 | For non-static member functions, we ignore the first argument, |
| 1702 | which is the type of the instance variable. This is because we |
| 1703 | want to handle calls with objects from derived classes. This is |
| 1704 | not entirely correct: we should actually check to make sure that a |
| 1705 | requested operation is type secure, shouldn't we? FIXME. */ |
| 1706 | |
| 1707 | static int |
| 1708 | typecmp (int staticp, int varargs, int nargs, |
| 1709 | struct field t1[], struct value *t2[]) |
| 1710 | { |
| 1711 | int i; |
| 1712 | |
| 1713 | if (t2 == 0) |
| 1714 | internal_error (__FILE__, __LINE__, |
| 1715 | _("typecmp: no argument list")); |
| 1716 | |
| 1717 | /* Skip ``this'' argument if applicable. T2 will always include |
| 1718 | THIS. */ |
| 1719 | if (staticp) |
| 1720 | t2 ++; |
| 1721 | |
| 1722 | for (i = 0; |
| 1723 | (i < nargs) && TYPE_CODE (t1[i].type) != TYPE_CODE_VOID; |
| 1724 | i++) |
| 1725 | { |
| 1726 | struct type *tt1, *tt2; |
| 1727 | |
| 1728 | if (!t2[i]) |
| 1729 | return i + 1; |
| 1730 | |
| 1731 | tt1 = check_typedef (t1[i].type); |
| 1732 | tt2 = check_typedef (value_type (t2[i])); |
| 1733 | |
| 1734 | if (TYPE_IS_REFERENCE (tt1) |
| 1735 | /* We should be doing hairy argument matching, as below. */ |
| 1736 | && (TYPE_CODE (check_typedef (TYPE_TARGET_TYPE (tt1))) |
| 1737 | == TYPE_CODE (tt2))) |
| 1738 | { |
| 1739 | if (TYPE_CODE (tt2) == TYPE_CODE_ARRAY) |
| 1740 | t2[i] = value_coerce_array (t2[i]); |
| 1741 | else |
| 1742 | t2[i] = value_ref (t2[i], TYPE_CODE (tt1)); |
| 1743 | continue; |
| 1744 | } |
| 1745 | |
| 1746 | /* djb - 20000715 - Until the new type structure is in the |
| 1747 | place, and we can attempt things like implicit conversions, |
| 1748 | we need to do this so you can take something like a map<const |
| 1749 | char *>, and properly access map["hello"], because the |
| 1750 | argument to [] will be a reference to a pointer to a char, |
| 1751 | and the argument will be a pointer to a char. */ |
| 1752 | while (TYPE_IS_REFERENCE (tt1) || TYPE_CODE (tt1) == TYPE_CODE_PTR) |
| 1753 | { |
| 1754 | tt1 = check_typedef( TYPE_TARGET_TYPE(tt1) ); |
| 1755 | } |
| 1756 | while (TYPE_CODE(tt2) == TYPE_CODE_ARRAY |
| 1757 | || TYPE_CODE(tt2) == TYPE_CODE_PTR |
| 1758 | || TYPE_IS_REFERENCE (tt2)) |
| 1759 | { |
| 1760 | tt2 = check_typedef (TYPE_TARGET_TYPE(tt2)); |
| 1761 | } |
| 1762 | if (TYPE_CODE (tt1) == TYPE_CODE (tt2)) |
| 1763 | continue; |
| 1764 | /* Array to pointer is a `trivial conversion' according to the |
| 1765 | ARM. */ |
| 1766 | |
| 1767 | /* We should be doing much hairier argument matching (see |
| 1768 | section 13.2 of the ARM), but as a quick kludge, just check |
| 1769 | for the same type code. */ |
| 1770 | if (TYPE_CODE (t1[i].type) != TYPE_CODE (value_type (t2[i]))) |
| 1771 | return i + 1; |
| 1772 | } |
| 1773 | if (varargs || t2[i] == NULL) |
| 1774 | return 0; |
| 1775 | return i + 1; |
| 1776 | } |
| 1777 | |
| 1778 | /* Helper class for do_search_struct_field that updates *RESULT_PTR |
| 1779 | and *LAST_BOFFSET, and possibly throws an exception if the field |
| 1780 | search has yielded ambiguous results. */ |
| 1781 | |
| 1782 | static void |
| 1783 | update_search_result (struct value **result_ptr, struct value *v, |
| 1784 | LONGEST *last_boffset, LONGEST boffset, |
| 1785 | const char *name, struct type *type) |
| 1786 | { |
| 1787 | if (v != NULL) |
| 1788 | { |
| 1789 | if (*result_ptr != NULL |
| 1790 | /* The result is not ambiguous if all the classes that are |
| 1791 | found occupy the same space. */ |
| 1792 | && *last_boffset != boffset) |
| 1793 | error (_("base class '%s' is ambiguous in type '%s'"), |
| 1794 | name, TYPE_SAFE_NAME (type)); |
| 1795 | *result_ptr = v; |
| 1796 | *last_boffset = boffset; |
| 1797 | } |
| 1798 | } |
| 1799 | |
| 1800 | /* A helper for search_struct_field. This does all the work; most |
| 1801 | arguments are as passed to search_struct_field. The result is |
| 1802 | stored in *RESULT_PTR, which must be initialized to NULL. |
| 1803 | OUTERMOST_TYPE is the type of the initial type passed to |
| 1804 | search_struct_field; this is used for error reporting when the |
| 1805 | lookup is ambiguous. */ |
| 1806 | |
| 1807 | static void |
| 1808 | do_search_struct_field (const char *name, struct value *arg1, LONGEST offset, |
| 1809 | struct type *type, int looking_for_baseclass, |
| 1810 | struct value **result_ptr, |
| 1811 | LONGEST *last_boffset, |
| 1812 | struct type *outermost_type) |
| 1813 | { |
| 1814 | int i; |
| 1815 | int nbases; |
| 1816 | |
| 1817 | type = check_typedef (type); |
| 1818 | nbases = TYPE_N_BASECLASSES (type); |
| 1819 | |
| 1820 | if (!looking_for_baseclass) |
| 1821 | for (i = TYPE_NFIELDS (type) - 1; i >= nbases; i--) |
| 1822 | { |
| 1823 | const char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 1824 | |
| 1825 | if (t_field_name && (strcmp_iw (t_field_name, name) == 0)) |
| 1826 | { |
| 1827 | struct value *v; |
| 1828 | |
| 1829 | if (field_is_static (&TYPE_FIELD (type, i))) |
| 1830 | v = value_static_field (type, i); |
| 1831 | else |
| 1832 | v = value_primitive_field (arg1, offset, i, type); |
| 1833 | *result_ptr = v; |
| 1834 | return; |
| 1835 | } |
| 1836 | |
| 1837 | if (t_field_name |
| 1838 | && t_field_name[0] == '\0') |
| 1839 | { |
| 1840 | struct type *field_type = TYPE_FIELD_TYPE (type, i); |
| 1841 | |
| 1842 | if (TYPE_CODE (field_type) == TYPE_CODE_UNION |
| 1843 | || TYPE_CODE (field_type) == TYPE_CODE_STRUCT) |
| 1844 | { |
| 1845 | /* Look for a match through the fields of an anonymous |
| 1846 | union, or anonymous struct. C++ provides anonymous |
| 1847 | unions. |
| 1848 | |
| 1849 | In the GNU Chill (now deleted from GDB) |
| 1850 | implementation of variant record types, each |
| 1851 | <alternative field> has an (anonymous) union type, |
| 1852 | each member of the union represents a <variant |
| 1853 | alternative>. Each <variant alternative> is |
| 1854 | represented as a struct, with a member for each |
| 1855 | <variant field>. */ |
| 1856 | |
| 1857 | struct value *v = NULL; |
| 1858 | LONGEST new_offset = offset; |
| 1859 | |
| 1860 | /* This is pretty gross. In G++, the offset in an |
| 1861 | anonymous union is relative to the beginning of the |
| 1862 | enclosing struct. In the GNU Chill (now deleted |
| 1863 | from GDB) implementation of variant records, the |
| 1864 | bitpos is zero in an anonymous union field, so we |
| 1865 | have to add the offset of the union here. */ |
| 1866 | if (TYPE_CODE (field_type) == TYPE_CODE_STRUCT |
| 1867 | || (TYPE_NFIELDS (field_type) > 0 |
| 1868 | && TYPE_FIELD_BITPOS (field_type, 0) == 0)) |
| 1869 | new_offset += TYPE_FIELD_BITPOS (type, i) / 8; |
| 1870 | |
| 1871 | do_search_struct_field (name, arg1, new_offset, |
| 1872 | field_type, |
| 1873 | looking_for_baseclass, &v, |
| 1874 | last_boffset, |
| 1875 | outermost_type); |
| 1876 | if (v) |
| 1877 | { |
| 1878 | *result_ptr = v; |
| 1879 | return; |
| 1880 | } |
| 1881 | } |
| 1882 | } |
| 1883 | } |
| 1884 | |
| 1885 | for (i = 0; i < nbases; i++) |
| 1886 | { |
| 1887 | struct value *v = NULL; |
| 1888 | struct type *basetype = check_typedef (TYPE_BASECLASS (type, i)); |
| 1889 | /* If we are looking for baseclasses, this is what we get when |
| 1890 | we hit them. But it could happen that the base part's member |
| 1891 | name is not yet filled in. */ |
| 1892 | int found_baseclass = (looking_for_baseclass |
| 1893 | && TYPE_BASECLASS_NAME (type, i) != NULL |
| 1894 | && (strcmp_iw (name, |
| 1895 | TYPE_BASECLASS_NAME (type, |
| 1896 | i)) == 0)); |
| 1897 | LONGEST boffset = value_embedded_offset (arg1) + offset; |
| 1898 | |
| 1899 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 1900 | { |
| 1901 | struct value *v2; |
| 1902 | |
| 1903 | boffset = baseclass_offset (type, i, |
| 1904 | value_contents_for_printing (arg1), |
| 1905 | value_embedded_offset (arg1) + offset, |
| 1906 | value_address (arg1), |
| 1907 | arg1); |
| 1908 | |
| 1909 | /* The virtual base class pointer might have been clobbered |
| 1910 | by the user program. Make sure that it still points to a |
| 1911 | valid memory location. */ |
| 1912 | |
| 1913 | boffset += value_embedded_offset (arg1) + offset; |
| 1914 | if (boffset < 0 |
| 1915 | || boffset >= TYPE_LENGTH (value_enclosing_type (arg1))) |
| 1916 | { |
| 1917 | CORE_ADDR base_addr; |
| 1918 | |
| 1919 | base_addr = value_address (arg1) + boffset; |
| 1920 | v2 = value_at_lazy (basetype, base_addr); |
| 1921 | if (target_read_memory (base_addr, |
| 1922 | value_contents_raw (v2), |
| 1923 | TYPE_LENGTH (value_type (v2))) != 0) |
| 1924 | error (_("virtual baseclass botch")); |
| 1925 | } |
| 1926 | else |
| 1927 | { |
| 1928 | v2 = value_copy (arg1); |
| 1929 | deprecated_set_value_type (v2, basetype); |
| 1930 | set_value_embedded_offset (v2, boffset); |
| 1931 | } |
| 1932 | |
| 1933 | if (found_baseclass) |
| 1934 | v = v2; |
| 1935 | else |
| 1936 | { |
| 1937 | do_search_struct_field (name, v2, 0, |
| 1938 | TYPE_BASECLASS (type, i), |
| 1939 | looking_for_baseclass, |
| 1940 | result_ptr, last_boffset, |
| 1941 | outermost_type); |
| 1942 | } |
| 1943 | } |
| 1944 | else if (found_baseclass) |
| 1945 | v = value_primitive_field (arg1, offset, i, type); |
| 1946 | else |
| 1947 | { |
| 1948 | do_search_struct_field (name, arg1, |
| 1949 | offset + TYPE_BASECLASS_BITPOS (type, |
| 1950 | i) / 8, |
| 1951 | basetype, looking_for_baseclass, |
| 1952 | result_ptr, last_boffset, |
| 1953 | outermost_type); |
| 1954 | } |
| 1955 | |
| 1956 | update_search_result (result_ptr, v, last_boffset, |
| 1957 | boffset, name, outermost_type); |
| 1958 | } |
| 1959 | } |
| 1960 | |
| 1961 | /* Helper function used by value_struct_elt to recurse through |
| 1962 | baseclasses. Look for a field NAME in ARG1. Search in it assuming |
| 1963 | it has (class) type TYPE. If found, return value, else return NULL. |
| 1964 | |
| 1965 | If LOOKING_FOR_BASECLASS, then instead of looking for struct |
| 1966 | fields, look for a baseclass named NAME. */ |
| 1967 | |
| 1968 | static struct value * |
| 1969 | search_struct_field (const char *name, struct value *arg1, |
| 1970 | struct type *type, int looking_for_baseclass) |
| 1971 | { |
| 1972 | struct value *result = NULL; |
| 1973 | LONGEST boffset = 0; |
| 1974 | |
| 1975 | do_search_struct_field (name, arg1, 0, type, looking_for_baseclass, |
| 1976 | &result, &boffset, type); |
| 1977 | return result; |
| 1978 | } |
| 1979 | |
| 1980 | /* Helper function used by value_struct_elt to recurse through |
| 1981 | baseclasses. Look for a field NAME in ARG1. Adjust the address of |
| 1982 | ARG1 by OFFSET bytes, and search in it assuming it has (class) type |
| 1983 | TYPE. |
| 1984 | |
| 1985 | If found, return value, else if name matched and args not return |
| 1986 | (value) -1, else return NULL. */ |
| 1987 | |
| 1988 | static struct value * |
| 1989 | search_struct_method (const char *name, struct value **arg1p, |
| 1990 | struct value **args, LONGEST offset, |
| 1991 | int *static_memfuncp, struct type *type) |
| 1992 | { |
| 1993 | int i; |
| 1994 | struct value *v; |
| 1995 | int name_matched = 0; |
| 1996 | char dem_opname[64]; |
| 1997 | |
| 1998 | type = check_typedef (type); |
| 1999 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--) |
| 2000 | { |
| 2001 | const char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i); |
| 2002 | |
| 2003 | /* FIXME! May need to check for ARM demangling here. */ |
| 2004 | if (startswith (t_field_name, "__") || |
| 2005 | startswith (t_field_name, "op") || |
| 2006 | startswith (t_field_name, "type")) |
| 2007 | { |
| 2008 | if (cplus_demangle_opname (t_field_name, dem_opname, DMGL_ANSI)) |
| 2009 | t_field_name = dem_opname; |
| 2010 | else if (cplus_demangle_opname (t_field_name, dem_opname, 0)) |
| 2011 | t_field_name = dem_opname; |
| 2012 | } |
| 2013 | if (t_field_name && (strcmp_iw (t_field_name, name) == 0)) |
| 2014 | { |
| 2015 | int j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1; |
| 2016 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i); |
| 2017 | |
| 2018 | name_matched = 1; |
| 2019 | check_stub_method_group (type, i); |
| 2020 | if (j > 0 && args == 0) |
| 2021 | error (_("cannot resolve overloaded method " |
| 2022 | "`%s': no arguments supplied"), name); |
| 2023 | else if (j == 0 && args == 0) |
| 2024 | { |
| 2025 | v = value_fn_field (arg1p, f, j, type, offset); |
| 2026 | if (v != NULL) |
| 2027 | return v; |
| 2028 | } |
| 2029 | else |
| 2030 | while (j >= 0) |
| 2031 | { |
| 2032 | if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j), |
| 2033 | TYPE_VARARGS (TYPE_FN_FIELD_TYPE (f, j)), |
| 2034 | TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (f, j)), |
| 2035 | TYPE_FN_FIELD_ARGS (f, j), args)) |
| 2036 | { |
| 2037 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) |
| 2038 | return value_virtual_fn_field (arg1p, f, j, |
| 2039 | type, offset); |
| 2040 | if (TYPE_FN_FIELD_STATIC_P (f, j) |
| 2041 | && static_memfuncp) |
| 2042 | *static_memfuncp = 1; |
| 2043 | v = value_fn_field (arg1p, f, j, type, offset); |
| 2044 | if (v != NULL) |
| 2045 | return v; |
| 2046 | } |
| 2047 | j--; |
| 2048 | } |
| 2049 | } |
| 2050 | } |
| 2051 | |
| 2052 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 2053 | { |
| 2054 | LONGEST base_offset; |
| 2055 | LONGEST this_offset; |
| 2056 | |
| 2057 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 2058 | { |
| 2059 | struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i)); |
| 2060 | struct value *base_val; |
| 2061 | const gdb_byte *base_valaddr; |
| 2062 | |
| 2063 | /* The virtual base class pointer might have been |
| 2064 | clobbered by the user program. Make sure that it |
| 2065 | still points to a valid memory location. */ |
| 2066 | |
| 2067 | if (offset < 0 || offset >= TYPE_LENGTH (type)) |
| 2068 | { |
| 2069 | CORE_ADDR address; |
| 2070 | |
| 2071 | gdb::byte_vector tmp (TYPE_LENGTH (baseclass)); |
| 2072 | address = value_address (*arg1p); |
| 2073 | |
| 2074 | if (target_read_memory (address + offset, |
| 2075 | tmp.data (), TYPE_LENGTH (baseclass)) != 0) |
| 2076 | error (_("virtual baseclass botch")); |
| 2077 | |
| 2078 | base_val = value_from_contents_and_address (baseclass, |
| 2079 | tmp.data (), |
| 2080 | address + offset); |
| 2081 | base_valaddr = value_contents_for_printing (base_val); |
| 2082 | this_offset = 0; |
| 2083 | } |
| 2084 | else |
| 2085 | { |
| 2086 | base_val = *arg1p; |
| 2087 | base_valaddr = value_contents_for_printing (*arg1p); |
| 2088 | this_offset = offset; |
| 2089 | } |
| 2090 | |
| 2091 | base_offset = baseclass_offset (type, i, base_valaddr, |
| 2092 | this_offset, value_address (base_val), |
| 2093 | base_val); |
| 2094 | } |
| 2095 | else |
| 2096 | { |
| 2097 | base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8; |
| 2098 | } |
| 2099 | v = search_struct_method (name, arg1p, args, base_offset + offset, |
| 2100 | static_memfuncp, TYPE_BASECLASS (type, i)); |
| 2101 | if (v == (struct value *) - 1) |
| 2102 | { |
| 2103 | name_matched = 1; |
| 2104 | } |
| 2105 | else if (v) |
| 2106 | { |
| 2107 | /* FIXME-bothner: Why is this commented out? Why is it here? */ |
| 2108 | /* *arg1p = arg1_tmp; */ |
| 2109 | return v; |
| 2110 | } |
| 2111 | } |
| 2112 | if (name_matched) |
| 2113 | return (struct value *) - 1; |
| 2114 | else |
| 2115 | return NULL; |
| 2116 | } |
| 2117 | |
| 2118 | /* Given *ARGP, a value of type (pointer to a)* structure/union, |
| 2119 | extract the component named NAME from the ultimate target |
| 2120 | structure/union and return it as a value with its appropriate type. |
| 2121 | ERR is used in the error message if *ARGP's type is wrong. |
| 2122 | |
| 2123 | C++: ARGS is a list of argument types to aid in the selection of |
| 2124 | an appropriate method. Also, handle derived types. |
| 2125 | |
| 2126 | STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location |
| 2127 | where the truthvalue of whether the function that was resolved was |
| 2128 | a static member function or not is stored. |
| 2129 | |
| 2130 | ERR is an error message to be printed in case the field is not |
| 2131 | found. */ |
| 2132 | |
| 2133 | struct value * |
| 2134 | value_struct_elt (struct value **argp, struct value **args, |
| 2135 | const char *name, int *static_memfuncp, const char *err) |
| 2136 | { |
| 2137 | struct type *t; |
| 2138 | struct value *v; |
| 2139 | |
| 2140 | *argp = coerce_array (*argp); |
| 2141 | |
| 2142 | t = check_typedef (value_type (*argp)); |
| 2143 | |
| 2144 | /* Follow pointers until we get to a non-pointer. */ |
| 2145 | |
| 2146 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (t)) |
| 2147 | { |
| 2148 | *argp = value_ind (*argp); |
| 2149 | /* Don't coerce fn pointer to fn and then back again! */ |
| 2150 | if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC) |
| 2151 | *argp = coerce_array (*argp); |
| 2152 | t = check_typedef (value_type (*argp)); |
| 2153 | } |
| 2154 | |
| 2155 | if (TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 2156 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 2157 | error (_("Attempt to extract a component of a value that is not a %s."), |
| 2158 | err); |
| 2159 | |
| 2160 | /* Assume it's not, unless we see that it is. */ |
| 2161 | if (static_memfuncp) |
| 2162 | *static_memfuncp = 0; |
| 2163 | |
| 2164 | if (!args) |
| 2165 | { |
| 2166 | /* if there are no arguments ...do this... */ |
| 2167 | |
| 2168 | /* Try as a field first, because if we succeed, there is less |
| 2169 | work to be done. */ |
| 2170 | v = search_struct_field (name, *argp, t, 0); |
| 2171 | if (v) |
| 2172 | return v; |
| 2173 | |
| 2174 | /* C++: If it was not found as a data field, then try to |
| 2175 | return it as a pointer to a method. */ |
| 2176 | v = search_struct_method (name, argp, args, 0, |
| 2177 | static_memfuncp, t); |
| 2178 | |
| 2179 | if (v == (struct value *) - 1) |
| 2180 | error (_("Cannot take address of method %s."), name); |
| 2181 | else if (v == 0) |
| 2182 | { |
| 2183 | if (TYPE_NFN_FIELDS (t)) |
| 2184 | error (_("There is no member or method named %s."), name); |
| 2185 | else |
| 2186 | error (_("There is no member named %s."), name); |
| 2187 | } |
| 2188 | return v; |
| 2189 | } |
| 2190 | |
| 2191 | v = search_struct_method (name, argp, args, 0, |
| 2192 | static_memfuncp, t); |
| 2193 | |
| 2194 | if (v == (struct value *) - 1) |
| 2195 | { |
| 2196 | error (_("One of the arguments you tried to pass to %s could not " |
| 2197 | "be converted to what the function wants."), name); |
| 2198 | } |
| 2199 | else if (v == 0) |
| 2200 | { |
| 2201 | /* See if user tried to invoke data as function. If so, hand it |
| 2202 | back. If it's not callable (i.e., a pointer to function), |
| 2203 | gdb should give an error. */ |
| 2204 | v = search_struct_field (name, *argp, t, 0); |
| 2205 | /* If we found an ordinary field, then it is not a method call. |
| 2206 | So, treat it as if it were a static member function. */ |
| 2207 | if (v && static_memfuncp) |
| 2208 | *static_memfuncp = 1; |
| 2209 | } |
| 2210 | |
| 2211 | if (!v) |
| 2212 | throw_error (NOT_FOUND_ERROR, |
| 2213 | _("Structure has no component named %s."), name); |
| 2214 | return v; |
| 2215 | } |
| 2216 | |
| 2217 | /* Given *ARGP, a value of type structure or union, or a pointer/reference |
| 2218 | to a structure or union, extract and return its component (field) of |
| 2219 | type FTYPE at the specified BITPOS. |
| 2220 | Throw an exception on error. */ |
| 2221 | |
| 2222 | struct value * |
| 2223 | value_struct_elt_bitpos (struct value **argp, int bitpos, struct type *ftype, |
| 2224 | const char *err) |
| 2225 | { |
| 2226 | struct type *t; |
| 2227 | int i; |
| 2228 | |
| 2229 | *argp = coerce_array (*argp); |
| 2230 | |
| 2231 | t = check_typedef (value_type (*argp)); |
| 2232 | |
| 2233 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (t)) |
| 2234 | { |
| 2235 | *argp = value_ind (*argp); |
| 2236 | if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC) |
| 2237 | *argp = coerce_array (*argp); |
| 2238 | t = check_typedef (value_type (*argp)); |
| 2239 | } |
| 2240 | |
| 2241 | if (TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 2242 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 2243 | error (_("Attempt to extract a component of a value that is not a %s."), |
| 2244 | err); |
| 2245 | |
| 2246 | for (i = TYPE_N_BASECLASSES (t); i < TYPE_NFIELDS (t); i++) |
| 2247 | { |
| 2248 | if (!field_is_static (&TYPE_FIELD (t, i)) |
| 2249 | && bitpos == TYPE_FIELD_BITPOS (t, i) |
| 2250 | && types_equal (ftype, TYPE_FIELD_TYPE (t, i))) |
| 2251 | return value_primitive_field (*argp, 0, i, t); |
| 2252 | } |
| 2253 | |
| 2254 | error (_("No field with matching bitpos and type.")); |
| 2255 | |
| 2256 | /* Never hit. */ |
| 2257 | return NULL; |
| 2258 | } |
| 2259 | |
| 2260 | /* See value.h. */ |
| 2261 | |
| 2262 | int |
| 2263 | value_union_variant (struct type *union_type, const gdb_byte *contents) |
| 2264 | { |
| 2265 | gdb_assert (TYPE_CODE (union_type) == TYPE_CODE_UNION |
| 2266 | && TYPE_FLAG_DISCRIMINATED_UNION (union_type)); |
| 2267 | |
| 2268 | struct dynamic_prop *discriminant_prop |
| 2269 | = get_dyn_prop (DYN_PROP_DISCRIMINATED, union_type); |
| 2270 | gdb_assert (discriminant_prop != nullptr); |
| 2271 | |
| 2272 | struct discriminant_info *info |
| 2273 | = (struct discriminant_info *) discriminant_prop->data.baton; |
| 2274 | gdb_assert (info != nullptr); |
| 2275 | |
| 2276 | /* If this is a univariant union, just return the sole field. */ |
| 2277 | if (TYPE_NFIELDS (union_type) == 1) |
| 2278 | return 0; |
| 2279 | /* This should only happen for univariants, which we already dealt |
| 2280 | with. */ |
| 2281 | gdb_assert (info->discriminant_index != -1); |
| 2282 | |
| 2283 | /* Compute the discriminant. Note that unpack_field_as_long handles |
| 2284 | sign extension when necessary, as does the DWARF reader -- so |
| 2285 | signed discriminants will be handled correctly despite the use of |
| 2286 | an unsigned type here. */ |
| 2287 | ULONGEST discriminant = unpack_field_as_long (union_type, contents, |
| 2288 | info->discriminant_index); |
| 2289 | |
| 2290 | for (int i = 0; i < TYPE_NFIELDS (union_type); ++i) |
| 2291 | { |
| 2292 | if (i != info->default_index |
| 2293 | && i != info->discriminant_index |
| 2294 | && discriminant == info->discriminants[i]) |
| 2295 | return i; |
| 2296 | } |
| 2297 | |
| 2298 | if (info->default_index == -1) |
| 2299 | error (_("Could not find variant corresponding to discriminant %s"), |
| 2300 | pulongest (discriminant)); |
| 2301 | return info->default_index; |
| 2302 | } |
| 2303 | |
| 2304 | /* Search through the methods of an object (and its bases) to find a |
| 2305 | specified method. Return the pointer to the fn_field list FN_LIST of |
| 2306 | overloaded instances defined in the source language. If available |
| 2307 | and matching, a vector of matching xmethods defined in extension |
| 2308 | languages are also returned in XM_WORKER_VEC |
| 2309 | |
| 2310 | Helper function for value_find_oload_list. |
| 2311 | ARGP is a pointer to a pointer to a value (the object). |
| 2312 | METHOD is a string containing the method name. |
| 2313 | OFFSET is the offset within the value. |
| 2314 | TYPE is the assumed type of the object. |
| 2315 | FN_LIST is the pointer to matching overloaded instances defined in |
| 2316 | source language. Since this is a recursive function, *FN_LIST |
| 2317 | should be set to NULL when calling this function. |
| 2318 | NUM_FNS is the number of overloaded instances. *NUM_FNS should be set to |
| 2319 | 0 when calling this function. |
| 2320 | XM_WORKER_VEC is the vector of matching xmethod workers. *XM_WORKER_VEC |
| 2321 | should also be set to NULL when calling this function. |
| 2322 | BASETYPE is set to the actual type of the subobject where the |
| 2323 | method is found. |
| 2324 | BOFFSET is the offset of the base subobject where the method is found. */ |
| 2325 | |
| 2326 | static void |
| 2327 | find_method_list (struct value **argp, const char *method, |
| 2328 | LONGEST offset, struct type *type, |
| 2329 | struct fn_field **fn_list, int *num_fns, |
| 2330 | std::vector<xmethod_worker_up> *xm_worker_vec, |
| 2331 | struct type **basetype, LONGEST *boffset) |
| 2332 | { |
| 2333 | int i; |
| 2334 | struct fn_field *f = NULL; |
| 2335 | |
| 2336 | gdb_assert (fn_list != NULL && xm_worker_vec != NULL); |
| 2337 | type = check_typedef (type); |
| 2338 | |
| 2339 | /* First check in object itself. |
| 2340 | This function is called recursively to search through base classes. |
| 2341 | If there is a source method match found at some stage, then we need not |
| 2342 | look for source methods in consequent recursive calls. */ |
| 2343 | if ((*fn_list) == NULL) |
| 2344 | { |
| 2345 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--) |
| 2346 | { |
| 2347 | /* pai: FIXME What about operators and type conversions? */ |
| 2348 | const char *fn_field_name = TYPE_FN_FIELDLIST_NAME (type, i); |
| 2349 | |
| 2350 | if (fn_field_name && (strcmp_iw (fn_field_name, method) == 0)) |
| 2351 | { |
| 2352 | int len = TYPE_FN_FIELDLIST_LENGTH (type, i); |
| 2353 | f = TYPE_FN_FIELDLIST1 (type, i); |
| 2354 | *fn_list = f; |
| 2355 | |
| 2356 | *num_fns = len; |
| 2357 | *basetype = type; |
| 2358 | *boffset = offset; |
| 2359 | |
| 2360 | /* Resolve any stub methods. */ |
| 2361 | check_stub_method_group (type, i); |
| 2362 | |
| 2363 | break; |
| 2364 | } |
| 2365 | } |
| 2366 | } |
| 2367 | |
| 2368 | /* Unlike source methods, xmethods can be accumulated over successive |
| 2369 | recursive calls. In other words, an xmethod named 'm' in a class |
| 2370 | will not hide an xmethod named 'm' in its base class(es). We want |
| 2371 | it to be this way because xmethods are after all convenience functions |
| 2372 | and hence there is no point restricting them with something like method |
| 2373 | hiding. Moreover, if hiding is done for xmethods as well, then we will |
| 2374 | have to provide a mechanism to un-hide (like the 'using' construct). */ |
| 2375 | get_matching_xmethod_workers (type, method, xm_worker_vec); |
| 2376 | |
| 2377 | /* If source methods are not found in current class, look for them in the |
| 2378 | base classes. We also have to go through the base classes to gather |
| 2379 | extension methods. */ |
| 2380 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 2381 | { |
| 2382 | LONGEST base_offset; |
| 2383 | |
| 2384 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 2385 | { |
| 2386 | base_offset = baseclass_offset (type, i, |
| 2387 | value_contents_for_printing (*argp), |
| 2388 | value_offset (*argp) + offset, |
| 2389 | value_address (*argp), *argp); |
| 2390 | } |
| 2391 | else /* Non-virtual base, simply use bit position from debug |
| 2392 | info. */ |
| 2393 | { |
| 2394 | base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8; |
| 2395 | } |
| 2396 | |
| 2397 | find_method_list (argp, method, base_offset + offset, |
| 2398 | TYPE_BASECLASS (type, i), fn_list, num_fns, |
| 2399 | xm_worker_vec, basetype, boffset); |
| 2400 | } |
| 2401 | } |
| 2402 | |
| 2403 | /* Return the list of overloaded methods of a specified name. The methods |
| 2404 | could be those GDB finds in the binary, or xmethod. Methods found in |
| 2405 | the binary are returned in FN_LIST, and xmethods are returned in |
| 2406 | XM_WORKER_VEC. |
| 2407 | |
| 2408 | ARGP is a pointer to a pointer to a value (the object). |
| 2409 | METHOD is the method name. |
| 2410 | OFFSET is the offset within the value contents. |
| 2411 | FN_LIST is the pointer to matching overloaded instances defined in |
| 2412 | source language. |
| 2413 | NUM_FNS is the number of overloaded instances. |
| 2414 | XM_WORKER_VEC is the vector of matching xmethod workers defined in |
| 2415 | extension languages. |
| 2416 | BASETYPE is set to the type of the base subobject that defines the |
| 2417 | method. |
| 2418 | BOFFSET is the offset of the base subobject which defines the method. */ |
| 2419 | |
| 2420 | static void |
| 2421 | value_find_oload_method_list (struct value **argp, const char *method, |
| 2422 | LONGEST offset, struct fn_field **fn_list, |
| 2423 | int *num_fns, |
| 2424 | std::vector<xmethod_worker_up> *xm_worker_vec, |
| 2425 | struct type **basetype, LONGEST *boffset) |
| 2426 | { |
| 2427 | struct type *t; |
| 2428 | |
| 2429 | t = check_typedef (value_type (*argp)); |
| 2430 | |
| 2431 | /* Code snarfed from value_struct_elt. */ |
| 2432 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (t)) |
| 2433 | { |
| 2434 | *argp = value_ind (*argp); |
| 2435 | /* Don't coerce fn pointer to fn and then back again! */ |
| 2436 | if (TYPE_CODE (check_typedef (value_type (*argp))) != TYPE_CODE_FUNC) |
| 2437 | *argp = coerce_array (*argp); |
| 2438 | t = check_typedef (value_type (*argp)); |
| 2439 | } |
| 2440 | |
| 2441 | if (TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 2442 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 2443 | error (_("Attempt to extract a component of a " |
| 2444 | "value that is not a struct or union")); |
| 2445 | |
| 2446 | gdb_assert (fn_list != NULL && xm_worker_vec != NULL); |
| 2447 | |
| 2448 | /* Clear the lists. */ |
| 2449 | *fn_list = NULL; |
| 2450 | *num_fns = 0; |
| 2451 | xm_worker_vec->clear (); |
| 2452 | |
| 2453 | find_method_list (argp, method, 0, t, fn_list, num_fns, xm_worker_vec, |
| 2454 | basetype, boffset); |
| 2455 | } |
| 2456 | |
| 2457 | /* Given an array of arguments (ARGS) (which includes an |
| 2458 | entry for "this" in the case of C++ methods), the number of |
| 2459 | arguments NARGS, the NAME of a function, and whether it's a method or |
| 2460 | not (METHOD), find the best function that matches on the argument types |
| 2461 | according to the overload resolution rules. |
| 2462 | |
| 2463 | METHOD can be one of three values: |
| 2464 | NON_METHOD for non-member functions. |
| 2465 | METHOD: for member functions. |
| 2466 | BOTH: used for overload resolution of operators where the |
| 2467 | candidates are expected to be either member or non member |
| 2468 | functions. In this case the first argument ARGTYPES |
| 2469 | (representing 'this') is expected to be a reference to the |
| 2470 | target object, and will be dereferenced when attempting the |
| 2471 | non-member search. |
| 2472 | |
| 2473 | In the case of class methods, the parameter OBJ is an object value |
| 2474 | in which to search for overloaded methods. |
| 2475 | |
| 2476 | In the case of non-method functions, the parameter FSYM is a symbol |
| 2477 | corresponding to one of the overloaded functions. |
| 2478 | |
| 2479 | Return value is an integer: 0 -> good match, 10 -> debugger applied |
| 2480 | non-standard coercions, 100 -> incompatible. |
| 2481 | |
| 2482 | If a method is being searched for, VALP will hold the value. |
| 2483 | If a non-method is being searched for, SYMP will hold the symbol |
| 2484 | for it. |
| 2485 | |
| 2486 | If a method is being searched for, and it is a static method, |
| 2487 | then STATICP will point to a non-zero value. |
| 2488 | |
| 2489 | If NO_ADL argument dependent lookup is disabled. This is used to prevent |
| 2490 | ADL overload candidates when performing overload resolution for a fully |
| 2491 | qualified name. |
| 2492 | |
| 2493 | If NOSIDE is EVAL_AVOID_SIDE_EFFECTS, then OBJP's memory cannot be |
| 2494 | read while picking the best overload match (it may be all zeroes and thus |
| 2495 | not have a vtable pointer), in which case skip virtual function lookup. |
| 2496 | This is ok as typically EVAL_AVOID_SIDE_EFFECTS is only used to determine |
| 2497 | the result type. |
| 2498 | |
| 2499 | Note: This function does *not* check the value of |
| 2500 | overload_resolution. Caller must check it to see whether overload |
| 2501 | resolution is permitted. */ |
| 2502 | |
| 2503 | int |
| 2504 | find_overload_match (struct value **args, int nargs, |
| 2505 | const char *name, enum oload_search_type method, |
| 2506 | struct value **objp, struct symbol *fsym, |
| 2507 | struct value **valp, struct symbol **symp, |
| 2508 | int *staticp, const int no_adl, |
| 2509 | const enum noside noside) |
| 2510 | { |
| 2511 | struct value *obj = (objp ? *objp : NULL); |
| 2512 | struct type *obj_type = obj ? value_type (obj) : NULL; |
| 2513 | /* Index of best overloaded function. */ |
| 2514 | int func_oload_champ = -1; |
| 2515 | int method_oload_champ = -1; |
| 2516 | int src_method_oload_champ = -1; |
| 2517 | int ext_method_oload_champ = -1; |
| 2518 | |
| 2519 | /* The measure for the current best match. */ |
| 2520 | struct badness_vector *method_badness = NULL; |
| 2521 | struct badness_vector *func_badness = NULL; |
| 2522 | struct badness_vector *ext_method_badness = NULL; |
| 2523 | struct badness_vector *src_method_badness = NULL; |
| 2524 | |
| 2525 | struct value *temp = obj; |
| 2526 | /* For methods, the list of overloaded methods. */ |
| 2527 | struct fn_field *fns_ptr = NULL; |
| 2528 | /* For non-methods, the list of overloaded function symbols. */ |
| 2529 | struct symbol **oload_syms = NULL; |
| 2530 | /* For xmethods, the vector of xmethod workers. */ |
| 2531 | std::vector<xmethod_worker_up> xm_worker_vec; |
| 2532 | /* Number of overloaded instances being considered. */ |
| 2533 | int num_fns = 0; |
| 2534 | struct type *basetype = NULL; |
| 2535 | LONGEST boffset; |
| 2536 | |
| 2537 | struct cleanup *all_cleanups = make_cleanup (null_cleanup, NULL); |
| 2538 | |
| 2539 | const char *obj_type_name = NULL; |
| 2540 | const char *func_name = NULL; |
| 2541 | enum oload_classification match_quality; |
| 2542 | enum oload_classification method_match_quality = INCOMPATIBLE; |
| 2543 | enum oload_classification src_method_match_quality = INCOMPATIBLE; |
| 2544 | enum oload_classification ext_method_match_quality = INCOMPATIBLE; |
| 2545 | enum oload_classification func_match_quality = INCOMPATIBLE; |
| 2546 | |
| 2547 | /* Get the list of overloaded methods or functions. */ |
| 2548 | if (method == METHOD || method == BOTH) |
| 2549 | { |
| 2550 | gdb_assert (obj); |
| 2551 | |
| 2552 | /* OBJ may be a pointer value rather than the object itself. */ |
| 2553 | obj = coerce_ref (obj); |
| 2554 | while (TYPE_CODE (check_typedef (value_type (obj))) == TYPE_CODE_PTR) |
| 2555 | obj = coerce_ref (value_ind (obj)); |
| 2556 | obj_type_name = TYPE_NAME (value_type (obj)); |
| 2557 | |
| 2558 | /* First check whether this is a data member, e.g. a pointer to |
| 2559 | a function. */ |
| 2560 | if (TYPE_CODE (check_typedef (value_type (obj))) == TYPE_CODE_STRUCT) |
| 2561 | { |
| 2562 | *valp = search_struct_field (name, obj, |
| 2563 | check_typedef (value_type (obj)), 0); |
| 2564 | if (*valp) |
| 2565 | { |
| 2566 | *staticp = 1; |
| 2567 | do_cleanups (all_cleanups); |
| 2568 | return 0; |
| 2569 | } |
| 2570 | } |
| 2571 | |
| 2572 | /* Retrieve the list of methods with the name NAME. */ |
| 2573 | value_find_oload_method_list (&temp, name, 0, &fns_ptr, &num_fns, |
| 2574 | &xm_worker_vec, &basetype, &boffset); |
| 2575 | /* If this is a method only search, and no methods were found |
| 2576 | the search has failed. */ |
| 2577 | if (method == METHOD && (!fns_ptr || !num_fns) && xm_worker_vec.empty ()) |
| 2578 | error (_("Couldn't find method %s%s%s"), |
| 2579 | obj_type_name, |
| 2580 | (obj_type_name && *obj_type_name) ? "::" : "", |
| 2581 | name); |
| 2582 | /* If we are dealing with stub method types, they should have |
| 2583 | been resolved by find_method_list via |
| 2584 | value_find_oload_method_list above. */ |
| 2585 | if (fns_ptr) |
| 2586 | { |
| 2587 | gdb_assert (TYPE_SELF_TYPE (fns_ptr[0].type) != NULL); |
| 2588 | |
| 2589 | src_method_oload_champ = find_oload_champ (args, nargs, |
| 2590 | num_fns, fns_ptr, NULL, |
| 2591 | NULL, &src_method_badness); |
| 2592 | |
| 2593 | src_method_match_quality = classify_oload_match |
| 2594 | (src_method_badness, nargs, |
| 2595 | oload_method_static_p (fns_ptr, src_method_oload_champ)); |
| 2596 | |
| 2597 | make_cleanup (xfree, src_method_badness); |
| 2598 | } |
| 2599 | |
| 2600 | if (!xm_worker_vec.empty ()) |
| 2601 | { |
| 2602 | ext_method_oload_champ = find_oload_champ (args, nargs, |
| 2603 | 0, NULL, &xm_worker_vec, |
| 2604 | NULL, &ext_method_badness); |
| 2605 | ext_method_match_quality = classify_oload_match (ext_method_badness, |
| 2606 | nargs, 0); |
| 2607 | make_cleanup (xfree, ext_method_badness); |
| 2608 | } |
| 2609 | |
| 2610 | if (src_method_oload_champ >= 0 && ext_method_oload_champ >= 0) |
| 2611 | { |
| 2612 | switch (compare_badness (ext_method_badness, src_method_badness)) |
| 2613 | { |
| 2614 | case 0: /* Src method and xmethod are equally good. */ |
| 2615 | /* If src method and xmethod are equally good, then |
| 2616 | xmethod should be the winner. Hence, fall through to the |
| 2617 | case where a xmethod is better than the source |
| 2618 | method, except when the xmethod match quality is |
| 2619 | non-standard. */ |
| 2620 | /* FALLTHROUGH */ |
| 2621 | case 1: /* Src method and ext method are incompatible. */ |
| 2622 | /* If ext method match is not standard, then let source method |
| 2623 | win. Otherwise, fallthrough to let xmethod win. */ |
| 2624 | if (ext_method_match_quality != STANDARD) |
| 2625 | { |
| 2626 | method_oload_champ = src_method_oload_champ; |
| 2627 | method_badness = src_method_badness; |
| 2628 | ext_method_oload_champ = -1; |
| 2629 | method_match_quality = src_method_match_quality; |
| 2630 | break; |
| 2631 | } |
| 2632 | /* FALLTHROUGH */ |
| 2633 | case 2: /* Ext method is champion. */ |
| 2634 | method_oload_champ = ext_method_oload_champ; |
| 2635 | method_badness = ext_method_badness; |
| 2636 | src_method_oload_champ = -1; |
| 2637 | method_match_quality = ext_method_match_quality; |
| 2638 | break; |
| 2639 | case 3: /* Src method is champion. */ |
| 2640 | method_oload_champ = src_method_oload_champ; |
| 2641 | method_badness = src_method_badness; |
| 2642 | ext_method_oload_champ = -1; |
| 2643 | method_match_quality = src_method_match_quality; |
| 2644 | break; |
| 2645 | default: |
| 2646 | gdb_assert_not_reached ("Unexpected overload comparison " |
| 2647 | "result"); |
| 2648 | break; |
| 2649 | } |
| 2650 | } |
| 2651 | else if (src_method_oload_champ >= 0) |
| 2652 | { |
| 2653 | method_oload_champ = src_method_oload_champ; |
| 2654 | method_badness = src_method_badness; |
| 2655 | method_match_quality = src_method_match_quality; |
| 2656 | } |
| 2657 | else if (ext_method_oload_champ >= 0) |
| 2658 | { |
| 2659 | method_oload_champ = ext_method_oload_champ; |
| 2660 | method_badness = ext_method_badness; |
| 2661 | method_match_quality = ext_method_match_quality; |
| 2662 | } |
| 2663 | } |
| 2664 | |
| 2665 | if (method == NON_METHOD || method == BOTH) |
| 2666 | { |
| 2667 | const char *qualified_name = NULL; |
| 2668 | |
| 2669 | /* If the overload match is being search for both as a method |
| 2670 | and non member function, the first argument must now be |
| 2671 | dereferenced. */ |
| 2672 | if (method == BOTH) |
| 2673 | args[0] = value_ind (args[0]); |
| 2674 | |
| 2675 | if (fsym) |
| 2676 | { |
| 2677 | qualified_name = SYMBOL_NATURAL_NAME (fsym); |
| 2678 | |
| 2679 | /* If we have a function with a C++ name, try to extract just |
| 2680 | the function part. Do not try this for non-functions (e.g. |
| 2681 | function pointers). */ |
| 2682 | if (qualified_name |
| 2683 | && TYPE_CODE (check_typedef (SYMBOL_TYPE (fsym))) |
| 2684 | == TYPE_CODE_FUNC) |
| 2685 | { |
| 2686 | char *temp; |
| 2687 | |
| 2688 | temp = cp_func_name (qualified_name); |
| 2689 | |
| 2690 | /* If cp_func_name did not remove anything, the name of the |
| 2691 | symbol did not include scope or argument types - it was |
| 2692 | probably a C-style function. */ |
| 2693 | if (temp) |
| 2694 | { |
| 2695 | make_cleanup (xfree, temp); |
| 2696 | if (strcmp (temp, qualified_name) == 0) |
| 2697 | func_name = NULL; |
| 2698 | else |
| 2699 | func_name = temp; |
| 2700 | } |
| 2701 | } |
| 2702 | } |
| 2703 | else |
| 2704 | { |
| 2705 | func_name = name; |
| 2706 | qualified_name = name; |
| 2707 | } |
| 2708 | |
| 2709 | /* If there was no C++ name, this must be a C-style function or |
| 2710 | not a function at all. Just return the same symbol. Do the |
| 2711 | same if cp_func_name fails for some reason. */ |
| 2712 | if (func_name == NULL) |
| 2713 | { |
| 2714 | *symp = fsym; |
| 2715 | do_cleanups (all_cleanups); |
| 2716 | return 0; |
| 2717 | } |
| 2718 | |
| 2719 | func_oload_champ = find_oload_champ_namespace (args, nargs, |
| 2720 | func_name, |
| 2721 | qualified_name, |
| 2722 | &oload_syms, |
| 2723 | &func_badness, |
| 2724 | no_adl); |
| 2725 | |
| 2726 | if (func_oload_champ >= 0) |
| 2727 | func_match_quality = classify_oload_match (func_badness, nargs, 0); |
| 2728 | |
| 2729 | make_cleanup (xfree, oload_syms); |
| 2730 | make_cleanup (xfree, func_badness); |
| 2731 | } |
| 2732 | |
| 2733 | /* Did we find a match ? */ |
| 2734 | if (method_oload_champ == -1 && func_oload_champ == -1) |
| 2735 | throw_error (NOT_FOUND_ERROR, |
| 2736 | _("No symbol \"%s\" in current context."), |
| 2737 | name); |
| 2738 | |
| 2739 | /* If we have found both a method match and a function |
| 2740 | match, find out which one is better, and calculate match |
| 2741 | quality. */ |
| 2742 | if (method_oload_champ >= 0 && func_oload_champ >= 0) |
| 2743 | { |
| 2744 | switch (compare_badness (func_badness, method_badness)) |
| 2745 | { |
| 2746 | case 0: /* Top two contenders are equally good. */ |
| 2747 | /* FIXME: GDB does not support the general ambiguous case. |
| 2748 | All candidates should be collected and presented the |
| 2749 | user. */ |
| 2750 | error (_("Ambiguous overload resolution")); |
| 2751 | break; |
| 2752 | case 1: /* Incomparable top contenders. */ |
| 2753 | /* This is an error incompatible candidates |
| 2754 | should not have been proposed. */ |
| 2755 | error (_("Internal error: incompatible " |
| 2756 | "overload candidates proposed")); |
| 2757 | break; |
| 2758 | case 2: /* Function champion. */ |
| 2759 | method_oload_champ = -1; |
| 2760 | match_quality = func_match_quality; |
| 2761 | break; |
| 2762 | case 3: /* Method champion. */ |
| 2763 | func_oload_champ = -1; |
| 2764 | match_quality = method_match_quality; |
| 2765 | break; |
| 2766 | default: |
| 2767 | error (_("Internal error: unexpected overload comparison result")); |
| 2768 | break; |
| 2769 | } |
| 2770 | } |
| 2771 | else |
| 2772 | { |
| 2773 | /* We have either a method match or a function match. */ |
| 2774 | if (method_oload_champ >= 0) |
| 2775 | match_quality = method_match_quality; |
| 2776 | else |
| 2777 | match_quality = func_match_quality; |
| 2778 | } |
| 2779 | |
| 2780 | if (match_quality == INCOMPATIBLE) |
| 2781 | { |
| 2782 | if (method == METHOD) |
| 2783 | error (_("Cannot resolve method %s%s%s to any overloaded instance"), |
| 2784 | obj_type_name, |
| 2785 | (obj_type_name && *obj_type_name) ? "::" : "", |
| 2786 | name); |
| 2787 | else |
| 2788 | error (_("Cannot resolve function %s to any overloaded instance"), |
| 2789 | func_name); |
| 2790 | } |
| 2791 | else if (match_quality == NON_STANDARD) |
| 2792 | { |
| 2793 | if (method == METHOD) |
| 2794 | warning (_("Using non-standard conversion to match " |
| 2795 | "method %s%s%s to supplied arguments"), |
| 2796 | obj_type_name, |
| 2797 | (obj_type_name && *obj_type_name) ? "::" : "", |
| 2798 | name); |
| 2799 | else |
| 2800 | warning (_("Using non-standard conversion to match " |
| 2801 | "function %s to supplied arguments"), |
| 2802 | func_name); |
| 2803 | } |
| 2804 | |
| 2805 | if (staticp != NULL) |
| 2806 | *staticp = oload_method_static_p (fns_ptr, method_oload_champ); |
| 2807 | |
| 2808 | if (method_oload_champ >= 0) |
| 2809 | { |
| 2810 | if (src_method_oload_champ >= 0) |
| 2811 | { |
| 2812 | if (TYPE_FN_FIELD_VIRTUAL_P (fns_ptr, method_oload_champ) |
| 2813 | && noside != EVAL_AVOID_SIDE_EFFECTS) |
| 2814 | { |
| 2815 | *valp = value_virtual_fn_field (&temp, fns_ptr, |
| 2816 | method_oload_champ, basetype, |
| 2817 | boffset); |
| 2818 | } |
| 2819 | else |
| 2820 | *valp = value_fn_field (&temp, fns_ptr, method_oload_champ, |
| 2821 | basetype, boffset); |
| 2822 | } |
| 2823 | else |
| 2824 | *valp = value_from_xmethod |
| 2825 | (std::move (xm_worker_vec[ext_method_oload_champ])); |
| 2826 | } |
| 2827 | else |
| 2828 | *symp = oload_syms[func_oload_champ]; |
| 2829 | |
| 2830 | if (objp) |
| 2831 | { |
| 2832 | struct type *temp_type = check_typedef (value_type (temp)); |
| 2833 | struct type *objtype = check_typedef (obj_type); |
| 2834 | |
| 2835 | if (TYPE_CODE (temp_type) != TYPE_CODE_PTR |
| 2836 | && (TYPE_CODE (objtype) == TYPE_CODE_PTR |
| 2837 | || TYPE_IS_REFERENCE (objtype))) |
| 2838 | { |
| 2839 | temp = value_addr (temp); |
| 2840 | } |
| 2841 | *objp = temp; |
| 2842 | } |
| 2843 | |
| 2844 | do_cleanups (all_cleanups); |
| 2845 | |
| 2846 | switch (match_quality) |
| 2847 | { |
| 2848 | case INCOMPATIBLE: |
| 2849 | return 100; |
| 2850 | case NON_STANDARD: |
| 2851 | return 10; |
| 2852 | default: /* STANDARD */ |
| 2853 | return 0; |
| 2854 | } |
| 2855 | } |
| 2856 | |
| 2857 | /* Find the best overload match, searching for FUNC_NAME in namespaces |
| 2858 | contained in QUALIFIED_NAME until it either finds a good match or |
| 2859 | runs out of namespaces. It stores the overloaded functions in |
| 2860 | *OLOAD_SYMS, and the badness vector in *OLOAD_CHAMP_BV. The |
| 2861 | calling function is responsible for freeing *OLOAD_SYMS and |
| 2862 | *OLOAD_CHAMP_BV. If NO_ADL, argument dependent lookup is not |
| 2863 | performned. */ |
| 2864 | |
| 2865 | static int |
| 2866 | find_oload_champ_namespace (struct value **args, int nargs, |
| 2867 | const char *func_name, |
| 2868 | const char *qualified_name, |
| 2869 | struct symbol ***oload_syms, |
| 2870 | struct badness_vector **oload_champ_bv, |
| 2871 | const int no_adl) |
| 2872 | { |
| 2873 | int oload_champ; |
| 2874 | |
| 2875 | find_oload_champ_namespace_loop (args, nargs, |
| 2876 | func_name, |
| 2877 | qualified_name, 0, |
| 2878 | oload_syms, oload_champ_bv, |
| 2879 | &oload_champ, |
| 2880 | no_adl); |
| 2881 | |
| 2882 | return oload_champ; |
| 2883 | } |
| 2884 | |
| 2885 | /* Helper function for find_oload_champ_namespace; NAMESPACE_LEN is |
| 2886 | how deep we've looked for namespaces, and the champ is stored in |
| 2887 | OLOAD_CHAMP. The return value is 1 if the champ is a good one, 0 |
| 2888 | if it isn't. Other arguments are the same as in |
| 2889 | find_oload_champ_namespace |
| 2890 | |
| 2891 | It is the caller's responsibility to free *OLOAD_SYMS and |
| 2892 | *OLOAD_CHAMP_BV. */ |
| 2893 | |
| 2894 | static int |
| 2895 | find_oload_champ_namespace_loop (struct value **args, int nargs, |
| 2896 | const char *func_name, |
| 2897 | const char *qualified_name, |
| 2898 | int namespace_len, |
| 2899 | struct symbol ***oload_syms, |
| 2900 | struct badness_vector **oload_champ_bv, |
| 2901 | int *oload_champ, |
| 2902 | const int no_adl) |
| 2903 | { |
| 2904 | int next_namespace_len = namespace_len; |
| 2905 | int searched_deeper = 0; |
| 2906 | int num_fns = 0; |
| 2907 | struct cleanup *old_cleanups; |
| 2908 | int new_oload_champ; |
| 2909 | struct symbol **new_oload_syms; |
| 2910 | struct badness_vector *new_oload_champ_bv; |
| 2911 | char *new_namespace; |
| 2912 | |
| 2913 | if (next_namespace_len != 0) |
| 2914 | { |
| 2915 | gdb_assert (qualified_name[next_namespace_len] == ':'); |
| 2916 | next_namespace_len += 2; |
| 2917 | } |
| 2918 | next_namespace_len += |
| 2919 | cp_find_first_component (qualified_name + next_namespace_len); |
| 2920 | |
| 2921 | /* Initialize these to values that can safely be xfree'd. */ |
| 2922 | *oload_syms = NULL; |
| 2923 | *oload_champ_bv = NULL; |
| 2924 | |
| 2925 | /* First, see if we have a deeper namespace we can search in. |
| 2926 | If we get a good match there, use it. */ |
| 2927 | |
| 2928 | if (qualified_name[next_namespace_len] == ':') |
| 2929 | { |
| 2930 | searched_deeper = 1; |
| 2931 | |
| 2932 | if (find_oload_champ_namespace_loop (args, nargs, |
| 2933 | func_name, qualified_name, |
| 2934 | next_namespace_len, |
| 2935 | oload_syms, oload_champ_bv, |
| 2936 | oload_champ, no_adl)) |
| 2937 | { |
| 2938 | return 1; |
| 2939 | } |
| 2940 | }; |
| 2941 | |
| 2942 | /* If we reach here, either we're in the deepest namespace or we |
| 2943 | didn't find a good match in a deeper namespace. But, in the |
| 2944 | latter case, we still have a bad match in a deeper namespace; |
| 2945 | note that we might not find any match at all in the current |
| 2946 | namespace. (There's always a match in the deepest namespace, |
| 2947 | because this overload mechanism only gets called if there's a |
| 2948 | function symbol to start off with.) */ |
| 2949 | |
| 2950 | old_cleanups = make_cleanup (xfree, *oload_syms); |
| 2951 | make_cleanup (xfree, *oload_champ_bv); |
| 2952 | new_namespace = (char *) alloca (namespace_len + 1); |
| 2953 | strncpy (new_namespace, qualified_name, namespace_len); |
| 2954 | new_namespace[namespace_len] = '\0'; |
| 2955 | new_oload_syms = make_symbol_overload_list (func_name, |
| 2956 | new_namespace); |
| 2957 | |
| 2958 | /* If we have reached the deepest level perform argument |
| 2959 | determined lookup. */ |
| 2960 | if (!searched_deeper && !no_adl) |
| 2961 | { |
| 2962 | int ix; |
| 2963 | struct type **arg_types; |
| 2964 | |
| 2965 | /* Prepare list of argument types for overload resolution. */ |
| 2966 | arg_types = (struct type **) |
| 2967 | alloca (nargs * (sizeof (struct type *))); |
| 2968 | for (ix = 0; ix < nargs; ix++) |
| 2969 | arg_types[ix] = value_type (args[ix]); |
| 2970 | make_symbol_overload_list_adl (arg_types, nargs, func_name); |
| 2971 | } |
| 2972 | |
| 2973 | while (new_oload_syms[num_fns]) |
| 2974 | ++num_fns; |
| 2975 | |
| 2976 | new_oload_champ = find_oload_champ (args, nargs, num_fns, |
| 2977 | NULL, NULL, new_oload_syms, |
| 2978 | &new_oload_champ_bv); |
| 2979 | |
| 2980 | /* Case 1: We found a good match. Free earlier matches (if any), |
| 2981 | and return it. Case 2: We didn't find a good match, but we're |
| 2982 | not the deepest function. Then go with the bad match that the |
| 2983 | deeper function found. Case 3: We found a bad match, and we're |
| 2984 | the deepest function. Then return what we found, even though |
| 2985 | it's a bad match. */ |
| 2986 | |
| 2987 | if (new_oload_champ != -1 |
| 2988 | && classify_oload_match (new_oload_champ_bv, nargs, 0) == STANDARD) |
| 2989 | { |
| 2990 | *oload_syms = new_oload_syms; |
| 2991 | *oload_champ = new_oload_champ; |
| 2992 | *oload_champ_bv = new_oload_champ_bv; |
| 2993 | do_cleanups (old_cleanups); |
| 2994 | return 1; |
| 2995 | } |
| 2996 | else if (searched_deeper) |
| 2997 | { |
| 2998 | xfree (new_oload_syms); |
| 2999 | xfree (new_oload_champ_bv); |
| 3000 | discard_cleanups (old_cleanups); |
| 3001 | return 0; |
| 3002 | } |
| 3003 | else |
| 3004 | { |
| 3005 | *oload_syms = new_oload_syms; |
| 3006 | *oload_champ = new_oload_champ; |
| 3007 | *oload_champ_bv = new_oload_champ_bv; |
| 3008 | do_cleanups (old_cleanups); |
| 3009 | return 0; |
| 3010 | } |
| 3011 | } |
| 3012 | |
| 3013 | /* Look for a function to take NARGS args of ARGS. Find |
| 3014 | the best match from among the overloaded methods or functions |
| 3015 | given by FNS_PTR or OLOAD_SYMS or XM_WORKER_VEC, respectively. |
| 3016 | One, and only one of FNS_PTR, OLOAD_SYMS and XM_WORKER_VEC can be |
| 3017 | non-NULL. |
| 3018 | |
| 3019 | If XM_WORKER_VEC is NULL, then the length of the arrays FNS_PTR |
| 3020 | or OLOAD_SYMS (whichever is non-NULL) is specified in NUM_FNS. |
| 3021 | |
| 3022 | Return the index of the best match; store an indication of the |
| 3023 | quality of the match in OLOAD_CHAMP_BV. |
| 3024 | |
| 3025 | It is the caller's responsibility to free *OLOAD_CHAMP_BV. */ |
| 3026 | |
| 3027 | static int |
| 3028 | find_oload_champ (struct value **args, int nargs, |
| 3029 | int num_fns, struct fn_field *fns_ptr, |
| 3030 | const std::vector<xmethod_worker_up> *xm_worker_vec, |
| 3031 | struct symbol **oload_syms, |
| 3032 | struct badness_vector **oload_champ_bv) |
| 3033 | { |
| 3034 | int ix; |
| 3035 | /* A measure of how good an overloaded instance is. */ |
| 3036 | struct badness_vector *bv; |
| 3037 | /* Index of best overloaded function. */ |
| 3038 | int oload_champ = -1; |
| 3039 | /* Current ambiguity state for overload resolution. */ |
| 3040 | int oload_ambiguous = 0; |
| 3041 | /* 0 => no ambiguity, 1 => two good funcs, 2 => incomparable funcs. */ |
| 3042 | |
| 3043 | /* A champion can be found among methods alone, or among functions |
| 3044 | alone, or in xmethods alone, but not in more than one of these |
| 3045 | groups. */ |
| 3046 | gdb_assert ((fns_ptr != NULL) + (oload_syms != NULL) + (xm_worker_vec != NULL) |
| 3047 | == 1); |
| 3048 | |
| 3049 | *oload_champ_bv = NULL; |
| 3050 | |
| 3051 | int fn_count = xm_worker_vec != NULL ? xm_worker_vec->size () : num_fns; |
| 3052 | |
| 3053 | /* Consider each candidate in turn. */ |
| 3054 | for (ix = 0; ix < fn_count; ix++) |
| 3055 | { |
| 3056 | int jj; |
| 3057 | int static_offset = 0; |
| 3058 | int nparms; |
| 3059 | struct type **parm_types; |
| 3060 | |
| 3061 | if (xm_worker_vec != NULL) |
| 3062 | { |
| 3063 | xmethod_worker *worker = (*xm_worker_vec)[ix].get (); |
| 3064 | parm_types = worker->get_arg_types (&nparms); |
| 3065 | } |
| 3066 | else |
| 3067 | { |
| 3068 | if (fns_ptr != NULL) |
| 3069 | { |
| 3070 | nparms = TYPE_NFIELDS (TYPE_FN_FIELD_TYPE (fns_ptr, ix)); |
| 3071 | static_offset = oload_method_static_p (fns_ptr, ix); |
| 3072 | } |
| 3073 | else |
| 3074 | nparms = TYPE_NFIELDS (SYMBOL_TYPE (oload_syms[ix])); |
| 3075 | |
| 3076 | parm_types = XNEWVEC (struct type *, nparms); |
| 3077 | for (jj = 0; jj < nparms; jj++) |
| 3078 | parm_types[jj] = (fns_ptr != NULL |
| 3079 | ? (TYPE_FN_FIELD_ARGS (fns_ptr, ix)[jj].type) |
| 3080 | : TYPE_FIELD_TYPE (SYMBOL_TYPE (oload_syms[ix]), |
| 3081 | jj)); |
| 3082 | } |
| 3083 | |
| 3084 | /* Compare parameter types to supplied argument types. Skip |
| 3085 | THIS for static methods. */ |
| 3086 | bv = rank_function (parm_types, nparms, |
| 3087 | args + static_offset, |
| 3088 | nargs - static_offset); |
| 3089 | |
| 3090 | if (!*oload_champ_bv) |
| 3091 | { |
| 3092 | *oload_champ_bv = bv; |
| 3093 | oload_champ = 0; |
| 3094 | } |
| 3095 | else /* See whether current candidate is better or worse than |
| 3096 | previous best. */ |
| 3097 | switch (compare_badness (bv, *oload_champ_bv)) |
| 3098 | { |
| 3099 | case 0: /* Top two contenders are equally good. */ |
| 3100 | oload_ambiguous = 1; |
| 3101 | break; |
| 3102 | case 1: /* Incomparable top contenders. */ |
| 3103 | oload_ambiguous = 2; |
| 3104 | break; |
| 3105 | case 2: /* New champion, record details. */ |
| 3106 | *oload_champ_bv = bv; |
| 3107 | oload_ambiguous = 0; |
| 3108 | oload_champ = ix; |
| 3109 | break; |
| 3110 | case 3: |
| 3111 | default: |
| 3112 | break; |
| 3113 | } |
| 3114 | xfree (parm_types); |
| 3115 | if (overload_debug) |
| 3116 | { |
| 3117 | if (fns_ptr != NULL) |
| 3118 | fprintf_filtered (gdb_stderr, |
| 3119 | "Overloaded method instance %s, # of parms %d\n", |
| 3120 | fns_ptr[ix].physname, nparms); |
| 3121 | else if (xm_worker_vec != NULL) |
| 3122 | fprintf_filtered (gdb_stderr, |
| 3123 | "Xmethod worker, # of parms %d\n", |
| 3124 | nparms); |
| 3125 | else |
| 3126 | fprintf_filtered (gdb_stderr, |
| 3127 | "Overloaded function instance " |
| 3128 | "%s # of parms %d\n", |
| 3129 | SYMBOL_DEMANGLED_NAME (oload_syms[ix]), |
| 3130 | nparms); |
| 3131 | for (jj = 0; jj < nargs - static_offset; jj++) |
| 3132 | fprintf_filtered (gdb_stderr, |
| 3133 | "...Badness @ %d : %d\n", |
| 3134 | jj, bv->rank[jj].rank); |
| 3135 | fprintf_filtered (gdb_stderr, "Overload resolution " |
| 3136 | "champion is %d, ambiguous? %d\n", |
| 3137 | oload_champ, oload_ambiguous); |
| 3138 | } |
| 3139 | } |
| 3140 | |
| 3141 | return oload_champ; |
| 3142 | } |
| 3143 | |
| 3144 | /* Return 1 if we're looking at a static method, 0 if we're looking at |
| 3145 | a non-static method or a function that isn't a method. */ |
| 3146 | |
| 3147 | static int |
| 3148 | oload_method_static_p (struct fn_field *fns_ptr, int index) |
| 3149 | { |
| 3150 | if (fns_ptr && index >= 0 && TYPE_FN_FIELD_STATIC_P (fns_ptr, index)) |
| 3151 | return 1; |
| 3152 | else |
| 3153 | return 0; |
| 3154 | } |
| 3155 | |
| 3156 | /* Check how good an overload match OLOAD_CHAMP_BV represents. */ |
| 3157 | |
| 3158 | static enum oload_classification |
| 3159 | classify_oload_match (struct badness_vector *oload_champ_bv, |
| 3160 | int nargs, |
| 3161 | int static_offset) |
| 3162 | { |
| 3163 | int ix; |
| 3164 | enum oload_classification worst = STANDARD; |
| 3165 | |
| 3166 | for (ix = 1; ix <= nargs - static_offset; ix++) |
| 3167 | { |
| 3168 | /* If this conversion is as bad as INCOMPATIBLE_TYPE_BADNESS |
| 3169 | or worse return INCOMPATIBLE. */ |
| 3170 | if (compare_ranks (oload_champ_bv->rank[ix], |
| 3171 | INCOMPATIBLE_TYPE_BADNESS) <= 0) |
| 3172 | return INCOMPATIBLE; /* Truly mismatched types. */ |
| 3173 | /* Otherwise If this conversion is as bad as |
| 3174 | NS_POINTER_CONVERSION_BADNESS or worse return NON_STANDARD. */ |
| 3175 | else if (compare_ranks (oload_champ_bv->rank[ix], |
| 3176 | NS_POINTER_CONVERSION_BADNESS) <= 0) |
| 3177 | worst = NON_STANDARD; /* Non-standard type conversions |
| 3178 | needed. */ |
| 3179 | } |
| 3180 | |
| 3181 | /* If no INCOMPATIBLE classification was found, return the worst one |
| 3182 | that was found (if any). */ |
| 3183 | return worst; |
| 3184 | } |
| 3185 | |
| 3186 | /* C++: return 1 is NAME is a legitimate name for the destructor of |
| 3187 | type TYPE. If TYPE does not have a destructor, or if NAME is |
| 3188 | inappropriate for TYPE, an error is signaled. Parameter TYPE should not yet |
| 3189 | have CHECK_TYPEDEF applied, this function will apply it itself. */ |
| 3190 | |
| 3191 | int |
| 3192 | destructor_name_p (const char *name, struct type *type) |
| 3193 | { |
| 3194 | if (name[0] == '~') |
| 3195 | { |
| 3196 | const char *dname = type_name_no_tag_or_error (type); |
| 3197 | const char *cp = strchr (dname, '<'); |
| 3198 | unsigned int len; |
| 3199 | |
| 3200 | /* Do not compare the template part for template classes. */ |
| 3201 | if (cp == NULL) |
| 3202 | len = strlen (dname); |
| 3203 | else |
| 3204 | len = cp - dname; |
| 3205 | if (strlen (name + 1) != len || strncmp (dname, name + 1, len) != 0) |
| 3206 | error (_("name of destructor must equal name of class")); |
| 3207 | else |
| 3208 | return 1; |
| 3209 | } |
| 3210 | return 0; |
| 3211 | } |
| 3212 | |
| 3213 | /* Find an enum constant named NAME in TYPE. TYPE must be an "enum |
| 3214 | class". If the name is found, return a value representing it; |
| 3215 | otherwise throw an exception. */ |
| 3216 | |
| 3217 | static struct value * |
| 3218 | enum_constant_from_type (struct type *type, const char *name) |
| 3219 | { |
| 3220 | int i; |
| 3221 | int name_len = strlen (name); |
| 3222 | |
| 3223 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_ENUM |
| 3224 | && TYPE_DECLARED_CLASS (type)); |
| 3225 | |
| 3226 | for (i = TYPE_N_BASECLASSES (type); i < TYPE_NFIELDS (type); ++i) |
| 3227 | { |
| 3228 | const char *fname = TYPE_FIELD_NAME (type, i); |
| 3229 | int len; |
| 3230 | |
| 3231 | if (TYPE_FIELD_LOC_KIND (type, i) != FIELD_LOC_KIND_ENUMVAL |
| 3232 | || fname == NULL) |
| 3233 | continue; |
| 3234 | |
| 3235 | /* Look for the trailing "::NAME", since enum class constant |
| 3236 | names are qualified here. */ |
| 3237 | len = strlen (fname); |
| 3238 | if (len + 2 >= name_len |
| 3239 | && fname[len - name_len - 2] == ':' |
| 3240 | && fname[len - name_len - 1] == ':' |
| 3241 | && strcmp (&fname[len - name_len], name) == 0) |
| 3242 | return value_from_longest (type, TYPE_FIELD_ENUMVAL (type, i)); |
| 3243 | } |
| 3244 | |
| 3245 | error (_("no constant named \"%s\" in enum \"%s\""), |
| 3246 | name, TYPE_TAG_NAME (type)); |
| 3247 | } |
| 3248 | |
| 3249 | /* C++: Given an aggregate type CURTYPE, and a member name NAME, |
| 3250 | return the appropriate member (or the address of the member, if |
| 3251 | WANT_ADDRESS). This function is used to resolve user expressions |
| 3252 | of the form "DOMAIN::NAME". For more details on what happens, see |
| 3253 | the comment before value_struct_elt_for_reference. */ |
| 3254 | |
| 3255 | struct value * |
| 3256 | value_aggregate_elt (struct type *curtype, const char *name, |
| 3257 | struct type *expect_type, int want_address, |
| 3258 | enum noside noside) |
| 3259 | { |
| 3260 | switch (TYPE_CODE (curtype)) |
| 3261 | { |
| 3262 | case TYPE_CODE_STRUCT: |
| 3263 | case TYPE_CODE_UNION: |
| 3264 | return value_struct_elt_for_reference (curtype, 0, curtype, |
| 3265 | name, expect_type, |
| 3266 | want_address, noside); |
| 3267 | case TYPE_CODE_NAMESPACE: |
| 3268 | return value_namespace_elt (curtype, name, |
| 3269 | want_address, noside); |
| 3270 | |
| 3271 | case TYPE_CODE_ENUM: |
| 3272 | return enum_constant_from_type (curtype, name); |
| 3273 | |
| 3274 | default: |
| 3275 | internal_error (__FILE__, __LINE__, |
| 3276 | _("non-aggregate type in value_aggregate_elt")); |
| 3277 | } |
| 3278 | } |
| 3279 | |
| 3280 | /* Compares the two method/function types T1 and T2 for "equality" |
| 3281 | with respect to the methods' parameters. If the types of the |
| 3282 | two parameter lists are the same, returns 1; 0 otherwise. This |
| 3283 | comparison may ignore any artificial parameters in T1 if |
| 3284 | SKIP_ARTIFICIAL is non-zero. This function will ALWAYS skip |
| 3285 | the first artificial parameter in T1, assumed to be a 'this' pointer. |
| 3286 | |
| 3287 | The type T2 is expected to have come from make_params (in eval.c). */ |
| 3288 | |
| 3289 | static int |
| 3290 | compare_parameters (struct type *t1, struct type *t2, int skip_artificial) |
| 3291 | { |
| 3292 | int start = 0; |
| 3293 | |
| 3294 | if (TYPE_NFIELDS (t1) > 0 && TYPE_FIELD_ARTIFICIAL (t1, 0)) |
| 3295 | ++start; |
| 3296 | |
| 3297 | /* If skipping artificial fields, find the first real field |
| 3298 | in T1. */ |
| 3299 | if (skip_artificial) |
| 3300 | { |
| 3301 | while (start < TYPE_NFIELDS (t1) |
| 3302 | && TYPE_FIELD_ARTIFICIAL (t1, start)) |
| 3303 | ++start; |
| 3304 | } |
| 3305 | |
| 3306 | /* Now compare parameters. */ |
| 3307 | |
| 3308 | /* Special case: a method taking void. T1 will contain no |
| 3309 | non-artificial fields, and T2 will contain TYPE_CODE_VOID. */ |
| 3310 | if ((TYPE_NFIELDS (t1) - start) == 0 && TYPE_NFIELDS (t2) == 1 |
| 3311 | && TYPE_CODE (TYPE_FIELD_TYPE (t2, 0)) == TYPE_CODE_VOID) |
| 3312 | return 1; |
| 3313 | |
| 3314 | if ((TYPE_NFIELDS (t1) - start) == TYPE_NFIELDS (t2)) |
| 3315 | { |
| 3316 | int i; |
| 3317 | |
| 3318 | for (i = 0; i < TYPE_NFIELDS (t2); ++i) |
| 3319 | { |
| 3320 | if (compare_ranks (rank_one_type (TYPE_FIELD_TYPE (t1, start + i), |
| 3321 | TYPE_FIELD_TYPE (t2, i), NULL), |
| 3322 | EXACT_MATCH_BADNESS) != 0) |
| 3323 | return 0; |
| 3324 | } |
| 3325 | |
| 3326 | return 1; |
| 3327 | } |
| 3328 | |
| 3329 | return 0; |
| 3330 | } |
| 3331 | |
| 3332 | /* C++: Given an aggregate type CURTYPE, and a member name NAME, |
| 3333 | return the address of this member as a "pointer to member" type. |
| 3334 | If INTYPE is non-null, then it will be the type of the member we |
| 3335 | are looking for. This will help us resolve "pointers to member |
| 3336 | functions". This function is used to resolve user expressions of |
| 3337 | the form "DOMAIN::NAME". */ |
| 3338 | |
| 3339 | static struct value * |
| 3340 | value_struct_elt_for_reference (struct type *domain, int offset, |
| 3341 | struct type *curtype, const char *name, |
| 3342 | struct type *intype, |
| 3343 | int want_address, |
| 3344 | enum noside noside) |
| 3345 | { |
| 3346 | struct type *t = curtype; |
| 3347 | int i; |
| 3348 | struct value *v, *result; |
| 3349 | |
| 3350 | if (TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 3351 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 3352 | error (_("Internal error: non-aggregate type " |
| 3353 | "to value_struct_elt_for_reference")); |
| 3354 | |
| 3355 | for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--) |
| 3356 | { |
| 3357 | const char *t_field_name = TYPE_FIELD_NAME (t, i); |
| 3358 | |
| 3359 | if (t_field_name && strcmp (t_field_name, name) == 0) |
| 3360 | { |
| 3361 | if (field_is_static (&TYPE_FIELD (t, i))) |
| 3362 | { |
| 3363 | v = value_static_field (t, i); |
| 3364 | if (want_address) |
| 3365 | v = value_addr (v); |
| 3366 | return v; |
| 3367 | } |
| 3368 | if (TYPE_FIELD_PACKED (t, i)) |
| 3369 | error (_("pointers to bitfield members not allowed")); |
| 3370 | |
| 3371 | if (want_address) |
| 3372 | return value_from_longest |
| 3373 | (lookup_memberptr_type (TYPE_FIELD_TYPE (t, i), domain), |
| 3374 | offset + (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3)); |
| 3375 | else if (noside != EVAL_NORMAL) |
| 3376 | return allocate_value (TYPE_FIELD_TYPE (t, i)); |
| 3377 | else |
| 3378 | { |
| 3379 | /* Try to evaluate NAME as a qualified name with implicit |
| 3380 | this pointer. In this case, attempt to return the |
| 3381 | equivalent to `this->*(&TYPE::NAME)'. */ |
| 3382 | v = value_of_this_silent (current_language); |
| 3383 | if (v != NULL) |
| 3384 | { |
| 3385 | struct value *ptr; |
| 3386 | long mem_offset; |
| 3387 | struct type *type, *tmp; |
| 3388 | |
| 3389 | ptr = value_aggregate_elt (domain, name, NULL, 1, noside); |
| 3390 | type = check_typedef (value_type (ptr)); |
| 3391 | gdb_assert (type != NULL |
| 3392 | && TYPE_CODE (type) == TYPE_CODE_MEMBERPTR); |
| 3393 | tmp = lookup_pointer_type (TYPE_SELF_TYPE (type)); |
| 3394 | v = value_cast_pointers (tmp, v, 1); |
| 3395 | mem_offset = value_as_long (ptr); |
| 3396 | tmp = lookup_pointer_type (TYPE_TARGET_TYPE (type)); |
| 3397 | result = value_from_pointer (tmp, |
| 3398 | value_as_long (v) + mem_offset); |
| 3399 | return value_ind (result); |
| 3400 | } |
| 3401 | |
| 3402 | error (_("Cannot reference non-static field \"%s\""), name); |
| 3403 | } |
| 3404 | } |
| 3405 | } |
| 3406 | |
| 3407 | /* C++: If it was not found as a data field, then try to return it |
| 3408 | as a pointer to a method. */ |
| 3409 | |
| 3410 | /* Perform all necessary dereferencing. */ |
| 3411 | while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR) |
| 3412 | intype = TYPE_TARGET_TYPE (intype); |
| 3413 | |
| 3414 | for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i) |
| 3415 | { |
| 3416 | const char *t_field_name = TYPE_FN_FIELDLIST_NAME (t, i); |
| 3417 | char dem_opname[64]; |
| 3418 | |
| 3419 | if (startswith (t_field_name, "__") |
| 3420 | || startswith (t_field_name, "op") |
| 3421 | || startswith (t_field_name, "type")) |
| 3422 | { |
| 3423 | if (cplus_demangle_opname (t_field_name, |
| 3424 | dem_opname, DMGL_ANSI)) |
| 3425 | t_field_name = dem_opname; |
| 3426 | else if (cplus_demangle_opname (t_field_name, |
| 3427 | dem_opname, 0)) |
| 3428 | t_field_name = dem_opname; |
| 3429 | } |
| 3430 | if (t_field_name && strcmp (t_field_name, name) == 0) |
| 3431 | { |
| 3432 | int j; |
| 3433 | int len = TYPE_FN_FIELDLIST_LENGTH (t, i); |
| 3434 | struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i); |
| 3435 | |
| 3436 | check_stub_method_group (t, i); |
| 3437 | |
| 3438 | if (intype) |
| 3439 | { |
| 3440 | for (j = 0; j < len; ++j) |
| 3441 | { |
| 3442 | if (TYPE_CONST (intype) != TYPE_FN_FIELD_CONST (f, j)) |
| 3443 | continue; |
| 3444 | if (TYPE_VOLATILE (intype) != TYPE_FN_FIELD_VOLATILE (f, j)) |
| 3445 | continue; |
| 3446 | |
| 3447 | if (compare_parameters (TYPE_FN_FIELD_TYPE (f, j), intype, 0) |
| 3448 | || compare_parameters (TYPE_FN_FIELD_TYPE (f, j), |
| 3449 | intype, 1)) |
| 3450 | break; |
| 3451 | } |
| 3452 | |
| 3453 | if (j == len) |
| 3454 | error (_("no member function matches " |
| 3455 | "that type instantiation")); |
| 3456 | } |
| 3457 | else |
| 3458 | { |
| 3459 | int ii; |
| 3460 | |
| 3461 | j = -1; |
| 3462 | for (ii = 0; ii < len; ++ii) |
| 3463 | { |
| 3464 | /* Skip artificial methods. This is necessary if, |
| 3465 | for example, the user wants to "print |
| 3466 | subclass::subclass" with only one user-defined |
| 3467 | constructor. There is no ambiguity in this case. |
| 3468 | We are careful here to allow artificial methods |
| 3469 | if they are the unique result. */ |
| 3470 | if (TYPE_FN_FIELD_ARTIFICIAL (f, ii)) |
| 3471 | { |
| 3472 | if (j == -1) |
| 3473 | j = ii; |
| 3474 | continue; |
| 3475 | } |
| 3476 | |
| 3477 | /* Desired method is ambiguous if more than one |
| 3478 | method is defined. */ |
| 3479 | if (j != -1 && !TYPE_FN_FIELD_ARTIFICIAL (f, j)) |
| 3480 | error (_("non-unique member `%s' requires " |
| 3481 | "type instantiation"), name); |
| 3482 | |
| 3483 | j = ii; |
| 3484 | } |
| 3485 | |
| 3486 | if (j == -1) |
| 3487 | error (_("no matching member function")); |
| 3488 | } |
| 3489 | |
| 3490 | if (TYPE_FN_FIELD_STATIC_P (f, j)) |
| 3491 | { |
| 3492 | struct symbol *s = |
| 3493 | lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), |
| 3494 | 0, VAR_DOMAIN, 0).symbol; |
| 3495 | |
| 3496 | if (s == NULL) |
| 3497 | return NULL; |
| 3498 | |
| 3499 | if (want_address) |
| 3500 | return value_addr (read_var_value (s, 0, 0)); |
| 3501 | else |
| 3502 | return read_var_value (s, 0, 0); |
| 3503 | } |
| 3504 | |
| 3505 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) |
| 3506 | { |
| 3507 | if (want_address) |
| 3508 | { |
| 3509 | result = allocate_value |
| 3510 | (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j))); |
| 3511 | cplus_make_method_ptr (value_type (result), |
| 3512 | value_contents_writeable (result), |
| 3513 | TYPE_FN_FIELD_VOFFSET (f, j), 1); |
| 3514 | } |
| 3515 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 3516 | return allocate_value (TYPE_FN_FIELD_TYPE (f, j)); |
| 3517 | else |
| 3518 | error (_("Cannot reference virtual member function \"%s\""), |
| 3519 | name); |
| 3520 | } |
| 3521 | else |
| 3522 | { |
| 3523 | struct symbol *s = |
| 3524 | lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), |
| 3525 | 0, VAR_DOMAIN, 0).symbol; |
| 3526 | |
| 3527 | if (s == NULL) |
| 3528 | return NULL; |
| 3529 | |
| 3530 | v = read_var_value (s, 0, 0); |
| 3531 | if (!want_address) |
| 3532 | result = v; |
| 3533 | else |
| 3534 | { |
| 3535 | result = allocate_value (lookup_methodptr_type (TYPE_FN_FIELD_TYPE (f, j))); |
| 3536 | cplus_make_method_ptr (value_type (result), |
| 3537 | value_contents_writeable (result), |
| 3538 | value_address (v), 0); |
| 3539 | } |
| 3540 | } |
| 3541 | return result; |
| 3542 | } |
| 3543 | } |
| 3544 | for (i = TYPE_N_BASECLASSES (t) - 1; i >= 0; i--) |
| 3545 | { |
| 3546 | struct value *v; |
| 3547 | int base_offset; |
| 3548 | |
| 3549 | if (BASETYPE_VIA_VIRTUAL (t, i)) |
| 3550 | base_offset = 0; |
| 3551 | else |
| 3552 | base_offset = TYPE_BASECLASS_BITPOS (t, i) / 8; |
| 3553 | v = value_struct_elt_for_reference (domain, |
| 3554 | offset + base_offset, |
| 3555 | TYPE_BASECLASS (t, i), |
| 3556 | name, intype, |
| 3557 | want_address, noside); |
| 3558 | if (v) |
| 3559 | return v; |
| 3560 | } |
| 3561 | |
| 3562 | /* As a last chance, pretend that CURTYPE is a namespace, and look |
| 3563 | it up that way; this (frequently) works for types nested inside |
| 3564 | classes. */ |
| 3565 | |
| 3566 | return value_maybe_namespace_elt (curtype, name, |
| 3567 | want_address, noside); |
| 3568 | } |
| 3569 | |
| 3570 | /* C++: Return the member NAME of the namespace given by the type |
| 3571 | CURTYPE. */ |
| 3572 | |
| 3573 | static struct value * |
| 3574 | value_namespace_elt (const struct type *curtype, |
| 3575 | const char *name, int want_address, |
| 3576 | enum noside noside) |
| 3577 | { |
| 3578 | struct value *retval = value_maybe_namespace_elt (curtype, name, |
| 3579 | want_address, |
| 3580 | noside); |
| 3581 | |
| 3582 | if (retval == NULL) |
| 3583 | error (_("No symbol \"%s\" in namespace \"%s\"."), |
| 3584 | name, TYPE_TAG_NAME (curtype)); |
| 3585 | |
| 3586 | return retval; |
| 3587 | } |
| 3588 | |
| 3589 | /* A helper function used by value_namespace_elt and |
| 3590 | value_struct_elt_for_reference. It looks up NAME inside the |
| 3591 | context CURTYPE; this works if CURTYPE is a namespace or if CURTYPE |
| 3592 | is a class and NAME refers to a type in CURTYPE itself (as opposed |
| 3593 | to, say, some base class of CURTYPE). */ |
| 3594 | |
| 3595 | static struct value * |
| 3596 | value_maybe_namespace_elt (const struct type *curtype, |
| 3597 | const char *name, int want_address, |
| 3598 | enum noside noside) |
| 3599 | { |
| 3600 | const char *namespace_name = TYPE_TAG_NAME (curtype); |
| 3601 | struct block_symbol sym; |
| 3602 | struct value *result; |
| 3603 | |
| 3604 | sym = cp_lookup_symbol_namespace (namespace_name, name, |
| 3605 | get_selected_block (0), VAR_DOMAIN); |
| 3606 | |
| 3607 | if (sym.symbol == NULL) |
| 3608 | return NULL; |
| 3609 | else if ((noside == EVAL_AVOID_SIDE_EFFECTS) |
| 3610 | && (SYMBOL_CLASS (sym.symbol) == LOC_TYPEDEF)) |
| 3611 | result = allocate_value (SYMBOL_TYPE (sym.symbol)); |
| 3612 | else |
| 3613 | result = value_of_variable (sym.symbol, sym.block); |
| 3614 | |
| 3615 | if (want_address) |
| 3616 | result = value_addr (result); |
| 3617 | |
| 3618 | return result; |
| 3619 | } |
| 3620 | |
| 3621 | /* Given a pointer or a reference value V, find its real (RTTI) type. |
| 3622 | |
| 3623 | Other parameters FULL, TOP, USING_ENC as with value_rtti_type() |
| 3624 | and refer to the values computed for the object pointed to. */ |
| 3625 | |
| 3626 | struct type * |
| 3627 | value_rtti_indirect_type (struct value *v, int *full, |
| 3628 | LONGEST *top, int *using_enc) |
| 3629 | { |
| 3630 | struct value *target = NULL; |
| 3631 | struct type *type, *real_type, *target_type; |
| 3632 | |
| 3633 | type = value_type (v); |
| 3634 | type = check_typedef (type); |
| 3635 | if (TYPE_IS_REFERENCE (type)) |
| 3636 | target = coerce_ref (v); |
| 3637 | else if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 3638 | { |
| 3639 | |
| 3640 | TRY |
| 3641 | { |
| 3642 | target = value_ind (v); |
| 3643 | } |
| 3644 | CATCH (except, RETURN_MASK_ERROR) |
| 3645 | { |
| 3646 | if (except.error == MEMORY_ERROR) |
| 3647 | { |
| 3648 | /* value_ind threw a memory error. The pointer is NULL or |
| 3649 | contains an uninitialized value: we can't determine any |
| 3650 | type. */ |
| 3651 | return NULL; |
| 3652 | } |
| 3653 | throw_exception (except); |
| 3654 | } |
| 3655 | END_CATCH |
| 3656 | } |
| 3657 | else |
| 3658 | return NULL; |
| 3659 | |
| 3660 | real_type = value_rtti_type (target, full, top, using_enc); |
| 3661 | |
| 3662 | if (real_type) |
| 3663 | { |
| 3664 | /* Copy qualifiers to the referenced object. */ |
| 3665 | target_type = value_type (target); |
| 3666 | real_type = make_cv_type (TYPE_CONST (target_type), |
| 3667 | TYPE_VOLATILE (target_type), real_type, NULL); |
| 3668 | if (TYPE_IS_REFERENCE (type)) |
| 3669 | real_type = lookup_reference_type (real_type, TYPE_CODE (type)); |
| 3670 | else if (TYPE_CODE (type) == TYPE_CODE_PTR) |
| 3671 | real_type = lookup_pointer_type (real_type); |
| 3672 | else |
| 3673 | internal_error (__FILE__, __LINE__, _("Unexpected value type.")); |
| 3674 | |
| 3675 | /* Copy qualifiers to the pointer/reference. */ |
| 3676 | real_type = make_cv_type (TYPE_CONST (type), TYPE_VOLATILE (type), |
| 3677 | real_type, NULL); |
| 3678 | } |
| 3679 | |
| 3680 | return real_type; |
| 3681 | } |
| 3682 | |
| 3683 | /* Given a value pointed to by ARGP, check its real run-time type, and |
| 3684 | if that is different from the enclosing type, create a new value |
| 3685 | using the real run-time type as the enclosing type (and of the same |
| 3686 | type as ARGP) and return it, with the embedded offset adjusted to |
| 3687 | be the correct offset to the enclosed object. RTYPE is the type, |
| 3688 | and XFULL, XTOP, and XUSING_ENC are the other parameters, computed |
| 3689 | by value_rtti_type(). If these are available, they can be supplied |
| 3690 | and a second call to value_rtti_type() is avoided. (Pass RTYPE == |
| 3691 | NULL if they're not available. */ |
| 3692 | |
| 3693 | struct value * |
| 3694 | value_full_object (struct value *argp, |
| 3695 | struct type *rtype, |
| 3696 | int xfull, int xtop, |
| 3697 | int xusing_enc) |
| 3698 | { |
| 3699 | struct type *real_type; |
| 3700 | int full = 0; |
| 3701 | LONGEST top = -1; |
| 3702 | int using_enc = 0; |
| 3703 | struct value *new_val; |
| 3704 | |
| 3705 | if (rtype) |
| 3706 | { |
| 3707 | real_type = rtype; |
| 3708 | full = xfull; |
| 3709 | top = xtop; |
| 3710 | using_enc = xusing_enc; |
| 3711 | } |
| 3712 | else |
| 3713 | real_type = value_rtti_type (argp, &full, &top, &using_enc); |
| 3714 | |
| 3715 | /* If no RTTI data, or if object is already complete, do nothing. */ |
| 3716 | if (!real_type || real_type == value_enclosing_type (argp)) |
| 3717 | return argp; |
| 3718 | |
| 3719 | /* In a destructor we might see a real type that is a superclass of |
| 3720 | the object's type. In this case it is better to leave the object |
| 3721 | as-is. */ |
| 3722 | if (full |
| 3723 | && TYPE_LENGTH (real_type) < TYPE_LENGTH (value_enclosing_type (argp))) |
| 3724 | return argp; |
| 3725 | |
| 3726 | /* If we have the full object, but for some reason the enclosing |
| 3727 | type is wrong, set it. */ |
| 3728 | /* pai: FIXME -- sounds iffy */ |
| 3729 | if (full) |
| 3730 | { |
| 3731 | argp = value_copy (argp); |
| 3732 | set_value_enclosing_type (argp, real_type); |
| 3733 | return argp; |
| 3734 | } |
| 3735 | |
| 3736 | /* Check if object is in memory. */ |
| 3737 | if (VALUE_LVAL (argp) != lval_memory) |
| 3738 | { |
| 3739 | warning (_("Couldn't retrieve complete object of RTTI " |
| 3740 | "type %s; object may be in register(s)."), |
| 3741 | TYPE_NAME (real_type)); |
| 3742 | |
| 3743 | return argp; |
| 3744 | } |
| 3745 | |
| 3746 | /* All other cases -- retrieve the complete object. */ |
| 3747 | /* Go back by the computed top_offset from the beginning of the |
| 3748 | object, adjusting for the embedded offset of argp if that's what |
| 3749 | value_rtti_type used for its computation. */ |
| 3750 | new_val = value_at_lazy (real_type, value_address (argp) - top + |
| 3751 | (using_enc ? 0 : value_embedded_offset (argp))); |
| 3752 | deprecated_set_value_type (new_val, value_type (argp)); |
| 3753 | set_value_embedded_offset (new_val, (using_enc |
| 3754 | ? top + value_embedded_offset (argp) |
| 3755 | : top)); |
| 3756 | return new_val; |
| 3757 | } |
| 3758 | |
| 3759 | |
| 3760 | /* Return the value of the local variable, if one exists. Throw error |
| 3761 | otherwise, such as if the request is made in an inappropriate context. */ |
| 3762 | |
| 3763 | struct value * |
| 3764 | value_of_this (const struct language_defn *lang) |
| 3765 | { |
| 3766 | struct block_symbol sym; |
| 3767 | const struct block *b; |
| 3768 | struct frame_info *frame; |
| 3769 | |
| 3770 | if (!lang->la_name_of_this) |
| 3771 | error (_("no `this' in current language")); |
| 3772 | |
| 3773 | frame = get_selected_frame (_("no frame selected")); |
| 3774 | |
| 3775 | b = get_frame_block (frame, NULL); |
| 3776 | |
| 3777 | sym = lookup_language_this (lang, b); |
| 3778 | if (sym.symbol == NULL) |
| 3779 | error (_("current stack frame does not contain a variable named `%s'"), |
| 3780 | lang->la_name_of_this); |
| 3781 | |
| 3782 | return read_var_value (sym.symbol, sym.block, frame); |
| 3783 | } |
| 3784 | |
| 3785 | /* Return the value of the local variable, if one exists. Return NULL |
| 3786 | otherwise. Never throw error. */ |
| 3787 | |
| 3788 | struct value * |
| 3789 | value_of_this_silent (const struct language_defn *lang) |
| 3790 | { |
| 3791 | struct value *ret = NULL; |
| 3792 | |
| 3793 | TRY |
| 3794 | { |
| 3795 | ret = value_of_this (lang); |
| 3796 | } |
| 3797 | CATCH (except, RETURN_MASK_ERROR) |
| 3798 | { |
| 3799 | } |
| 3800 | END_CATCH |
| 3801 | |
| 3802 | return ret; |
| 3803 | } |
| 3804 | |
| 3805 | /* Create a slice (sub-string, sub-array) of ARRAY, that is LENGTH |
| 3806 | elements long, starting at LOWBOUND. The result has the same lower |
| 3807 | bound as the original ARRAY. */ |
| 3808 | |
| 3809 | struct value * |
| 3810 | value_slice (struct value *array, int lowbound, int length) |
| 3811 | { |
| 3812 | struct type *slice_range_type, *slice_type, *range_type; |
| 3813 | LONGEST lowerbound, upperbound; |
| 3814 | struct value *slice; |
| 3815 | struct type *array_type; |
| 3816 | |
| 3817 | array_type = check_typedef (value_type (array)); |
| 3818 | if (TYPE_CODE (array_type) != TYPE_CODE_ARRAY |
| 3819 | && TYPE_CODE (array_type) != TYPE_CODE_STRING) |
| 3820 | error (_("cannot take slice of non-array")); |
| 3821 | |
| 3822 | range_type = TYPE_INDEX_TYPE (array_type); |
| 3823 | if (get_discrete_bounds (range_type, &lowerbound, &upperbound) < 0) |
| 3824 | error (_("slice from bad array or bitstring")); |
| 3825 | |
| 3826 | if (lowbound < lowerbound || length < 0 |
| 3827 | || lowbound + length - 1 > upperbound) |
| 3828 | error (_("slice out of range")); |
| 3829 | |
| 3830 | /* FIXME-type-allocation: need a way to free this type when we are |
| 3831 | done with it. */ |
| 3832 | slice_range_type = create_static_range_type ((struct type *) NULL, |
| 3833 | TYPE_TARGET_TYPE (range_type), |
| 3834 | lowbound, |
| 3835 | lowbound + length - 1); |
| 3836 | |
| 3837 | { |
| 3838 | struct type *element_type = TYPE_TARGET_TYPE (array_type); |
| 3839 | LONGEST offset |
| 3840 | = (lowbound - lowerbound) * TYPE_LENGTH (check_typedef (element_type)); |
| 3841 | |
| 3842 | slice_type = create_array_type ((struct type *) NULL, |
| 3843 | element_type, |
| 3844 | slice_range_type); |
| 3845 | TYPE_CODE (slice_type) = TYPE_CODE (array_type); |
| 3846 | |
| 3847 | if (VALUE_LVAL (array) == lval_memory && value_lazy (array)) |
| 3848 | slice = allocate_value_lazy (slice_type); |
| 3849 | else |
| 3850 | { |
| 3851 | slice = allocate_value (slice_type); |
| 3852 | value_contents_copy (slice, 0, array, offset, |
| 3853 | type_length_units (slice_type)); |
| 3854 | } |
| 3855 | |
| 3856 | set_value_component_location (slice, array); |
| 3857 | set_value_offset (slice, value_offset (array) + offset); |
| 3858 | } |
| 3859 | |
| 3860 | return slice; |
| 3861 | } |
| 3862 | |
| 3863 | /* Create a value for a FORTRAN complex number. Currently most of the |
| 3864 | time values are coerced to COMPLEX*16 (i.e. a complex number |
| 3865 | composed of 2 doubles. This really should be a smarter routine |
| 3866 | that figures out precision inteligently as opposed to assuming |
| 3867 | doubles. FIXME: fmb */ |
| 3868 | |
| 3869 | struct value * |
| 3870 | value_literal_complex (struct value *arg1, |
| 3871 | struct value *arg2, |
| 3872 | struct type *type) |
| 3873 | { |
| 3874 | struct value *val; |
| 3875 | struct type *real_type = TYPE_TARGET_TYPE (type); |
| 3876 | |
| 3877 | val = allocate_value (type); |
| 3878 | arg1 = value_cast (real_type, arg1); |
| 3879 | arg2 = value_cast (real_type, arg2); |
| 3880 | |
| 3881 | memcpy (value_contents_raw (val), |
| 3882 | value_contents (arg1), TYPE_LENGTH (real_type)); |
| 3883 | memcpy (value_contents_raw (val) + TYPE_LENGTH (real_type), |
| 3884 | value_contents (arg2), TYPE_LENGTH (real_type)); |
| 3885 | return val; |
| 3886 | } |
| 3887 | |
| 3888 | /* Cast a value into the appropriate complex data type. */ |
| 3889 | |
| 3890 | static struct value * |
| 3891 | cast_into_complex (struct type *type, struct value *val) |
| 3892 | { |
| 3893 | struct type *real_type = TYPE_TARGET_TYPE (type); |
| 3894 | |
| 3895 | if (TYPE_CODE (value_type (val)) == TYPE_CODE_COMPLEX) |
| 3896 | { |
| 3897 | struct type *val_real_type = TYPE_TARGET_TYPE (value_type (val)); |
| 3898 | struct value *re_val = allocate_value (val_real_type); |
| 3899 | struct value *im_val = allocate_value (val_real_type); |
| 3900 | |
| 3901 | memcpy (value_contents_raw (re_val), |
| 3902 | value_contents (val), TYPE_LENGTH (val_real_type)); |
| 3903 | memcpy (value_contents_raw (im_val), |
| 3904 | value_contents (val) + TYPE_LENGTH (val_real_type), |
| 3905 | TYPE_LENGTH (val_real_type)); |
| 3906 | |
| 3907 | return value_literal_complex (re_val, im_val, type); |
| 3908 | } |
| 3909 | else if (TYPE_CODE (value_type (val)) == TYPE_CODE_FLT |
| 3910 | || TYPE_CODE (value_type (val)) == TYPE_CODE_INT) |
| 3911 | return value_literal_complex (val, |
| 3912 | value_zero (real_type, not_lval), |
| 3913 | type); |
| 3914 | else |
| 3915 | error (_("cannot cast non-number to complex")); |
| 3916 | } |
| 3917 | |
| 3918 | void |
| 3919 | _initialize_valops (void) |
| 3920 | { |
| 3921 | add_setshow_boolean_cmd ("overload-resolution", class_support, |
| 3922 | &overload_resolution, _("\ |
| 3923 | Set overload resolution in evaluating C++ functions."), _("\ |
| 3924 | Show overload resolution in evaluating C++ functions."), |
| 3925 | NULL, NULL, |
| 3926 | show_overload_resolution, |
| 3927 | &setlist, &showlist); |
| 3928 | overload_resolution = 1; |
| 3929 | } |