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