| 1 | /* Perform non-arithmetic operations on values, for GDB. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "symtab.h" |
| 23 | #include "gdbtypes.h" |
| 24 | #include "value.h" |
| 25 | #include "frame.h" |
| 26 | #include "inferior.h" |
| 27 | #include "gdbcore.h" |
| 28 | #include "target.h" |
| 29 | #include "demangle.h" |
| 30 | #include "language.h" |
| 31 | |
| 32 | #include <errno.h> |
| 33 | #include "gdb_string.h" |
| 34 | |
| 35 | /* Default to coercing float to double in function calls only when there is |
| 36 | no prototype. Otherwise on targets where the debug information is incorrect |
| 37 | for either the prototype or non-prototype case, we can force it by defining |
| 38 | COERCE_FLOAT_TO_DOUBLE in the target configuration file. */ |
| 39 | |
| 40 | #ifndef COERCE_FLOAT_TO_DOUBLE |
| 41 | #define COERCE_FLOAT_TO_DOUBLE (param_type == NULL) |
| 42 | #endif |
| 43 | |
| 44 | /* Local functions. */ |
| 45 | |
| 46 | static int typecmp PARAMS ((int staticp, struct type *t1[], value_ptr t2[])); |
| 47 | |
| 48 | #ifdef CALL_DUMMY |
| 49 | static CORE_ADDR find_function_addr PARAMS ((value_ptr, struct type **)); |
| 50 | static value_ptr value_arg_coerce PARAMS ((value_ptr, struct type *)); |
| 51 | #endif |
| 52 | |
| 53 | |
| 54 | #ifndef PUSH_ARGUMENTS |
| 55 | static CORE_ADDR value_push PARAMS ((CORE_ADDR, value_ptr)); |
| 56 | #endif |
| 57 | |
| 58 | static value_ptr search_struct_field PARAMS ((char *, value_ptr, int, |
| 59 | struct type *, int)); |
| 60 | |
| 61 | static value_ptr search_struct_method PARAMS ((char *, value_ptr *, |
| 62 | value_ptr *, |
| 63 | int, int *, struct type *)); |
| 64 | |
| 65 | static int check_field_in PARAMS ((struct type *, const char *)); |
| 66 | |
| 67 | static CORE_ADDR allocate_space_in_inferior PARAMS ((int)); |
| 68 | |
| 69 | static value_ptr cast_into_complex PARAMS ((struct type *, value_ptr)); |
| 70 | |
| 71 | #define VALUE_SUBSTRING_START(VAL) VALUE_FRAME(VAL) |
| 72 | |
| 73 | /* Flag for whether we want to abandon failed expression evals by default. */ |
| 74 | |
| 75 | #if 0 |
| 76 | static int auto_abandon = 0; |
| 77 | #endif |
| 78 | |
| 79 | \f |
| 80 | /* Find the address of function name NAME in the inferior. */ |
| 81 | |
| 82 | value_ptr |
| 83 | find_function_in_inferior (name) |
| 84 | char *name; |
| 85 | { |
| 86 | register struct symbol *sym; |
| 87 | sym = lookup_symbol (name, 0, VAR_NAMESPACE, 0, NULL); |
| 88 | if (sym != NULL) |
| 89 | { |
| 90 | if (SYMBOL_CLASS (sym) != LOC_BLOCK) |
| 91 | { |
| 92 | error ("\"%s\" exists in this program but is not a function.", |
| 93 | name); |
| 94 | } |
| 95 | return value_of_variable (sym, NULL); |
| 96 | } |
| 97 | else |
| 98 | { |
| 99 | struct minimal_symbol *msymbol = lookup_minimal_symbol(name, NULL, NULL); |
| 100 | if (msymbol != NULL) |
| 101 | { |
| 102 | struct type *type; |
| 103 | LONGEST maddr; |
| 104 | type = lookup_pointer_type (builtin_type_char); |
| 105 | type = lookup_function_type (type); |
| 106 | type = lookup_pointer_type (type); |
| 107 | maddr = (LONGEST) SYMBOL_VALUE_ADDRESS (msymbol); |
| 108 | return value_from_longest (type, maddr); |
| 109 | } |
| 110 | else |
| 111 | { |
| 112 | error ("evaluation of this expression requires the program to have a function \"%s\".", name); |
| 113 | } |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | /* Allocate NBYTES of space in the inferior using the inferior's malloc |
| 118 | and return a value that is a pointer to the allocated space. */ |
| 119 | |
| 120 | value_ptr |
| 121 | value_allocate_space_in_inferior (len) |
| 122 | int len; |
| 123 | { |
| 124 | value_ptr blocklen; |
| 125 | register value_ptr val = find_function_in_inferior ("malloc"); |
| 126 | |
| 127 | blocklen = value_from_longest (builtin_type_int, (LONGEST) len); |
| 128 | val = call_function_by_hand (val, 1, &blocklen); |
| 129 | if (value_logical_not (val)) |
| 130 | { |
| 131 | error ("No memory available to program."); |
| 132 | } |
| 133 | return val; |
| 134 | } |
| 135 | |
| 136 | static CORE_ADDR |
| 137 | allocate_space_in_inferior (len) |
| 138 | int len; |
| 139 | { |
| 140 | return value_as_long (value_allocate_space_in_inferior (len)); |
| 141 | } |
| 142 | |
| 143 | /* Cast value ARG2 to type TYPE and return as a value. |
| 144 | More general than a C cast: accepts any two types of the same length, |
| 145 | and if ARG2 is an lvalue it can be cast into anything at all. */ |
| 146 | /* In C++, casts may change pointer or object representations. */ |
| 147 | |
| 148 | value_ptr |
| 149 | value_cast (type, arg2) |
| 150 | struct type *type; |
| 151 | register value_ptr arg2; |
| 152 | { |
| 153 | register enum type_code code1; |
| 154 | register enum type_code code2; |
| 155 | register int scalar; |
| 156 | struct type *type2; |
| 157 | |
| 158 | if (VALUE_TYPE (arg2) == type) |
| 159 | return arg2; |
| 160 | |
| 161 | CHECK_TYPEDEF (type); |
| 162 | code1 = TYPE_CODE (type); |
| 163 | COERCE_REF(arg2); |
| 164 | type2 = check_typedef (VALUE_TYPE (arg2)); |
| 165 | |
| 166 | /* A cast to an undetermined-length array_type, such as (TYPE [])OBJECT, |
| 167 | is treated like a cast to (TYPE [N])OBJECT, |
| 168 | where N is sizeof(OBJECT)/sizeof(TYPE). */ |
| 169 | if (code1 == TYPE_CODE_ARRAY) |
| 170 | { |
| 171 | struct type *element_type = TYPE_TARGET_TYPE (type); |
| 172 | unsigned element_length = TYPE_LENGTH (check_typedef (element_type)); |
| 173 | if (element_length > 0 |
| 174 | && TYPE_ARRAY_UPPER_BOUND_TYPE (type) == BOUND_CANNOT_BE_DETERMINED) |
| 175 | { |
| 176 | struct type *range_type = TYPE_INDEX_TYPE (type); |
| 177 | int val_length = TYPE_LENGTH (type2); |
| 178 | LONGEST low_bound, high_bound, new_length; |
| 179 | if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0) |
| 180 | low_bound = 0, high_bound = 0; |
| 181 | new_length = val_length / element_length; |
| 182 | if (val_length % element_length != 0) |
| 183 | warning("array element type size does not divide object size in cast"); |
| 184 | /* FIXME-type-allocation: need a way to free this type when we are |
| 185 | done with it. */ |
| 186 | range_type = create_range_type ((struct type *) NULL, |
| 187 | TYPE_TARGET_TYPE (range_type), |
| 188 | low_bound, |
| 189 | new_length + low_bound - 1); |
| 190 | VALUE_TYPE (arg2) = create_array_type ((struct type *) NULL, |
| 191 | element_type, range_type); |
| 192 | return arg2; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | if (current_language->c_style_arrays |
| 197 | && TYPE_CODE (type2) == TYPE_CODE_ARRAY) |
| 198 | arg2 = value_coerce_array (arg2); |
| 199 | |
| 200 | if (TYPE_CODE (type2) == TYPE_CODE_FUNC) |
| 201 | arg2 = value_coerce_function (arg2); |
| 202 | |
| 203 | type2 = check_typedef (VALUE_TYPE (arg2)); |
| 204 | COERCE_VARYING_ARRAY (arg2, type2); |
| 205 | code2 = TYPE_CODE (type2); |
| 206 | |
| 207 | if (code1 == TYPE_CODE_COMPLEX) |
| 208 | return cast_into_complex (type, arg2); |
| 209 | if (code1 == TYPE_CODE_BOOL || code1 == TYPE_CODE_CHAR) |
| 210 | code1 = TYPE_CODE_INT; |
| 211 | if (code2 == TYPE_CODE_BOOL || code2 == TYPE_CODE_CHAR) |
| 212 | code2 = TYPE_CODE_INT; |
| 213 | |
| 214 | scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT |
| 215 | || code2 == TYPE_CODE_ENUM || code2 == TYPE_CODE_RANGE); |
| 216 | |
| 217 | if ( code1 == TYPE_CODE_STRUCT |
| 218 | && code2 == TYPE_CODE_STRUCT |
| 219 | && TYPE_NAME (type) != 0) |
| 220 | { |
| 221 | /* Look in the type of the source to see if it contains the |
| 222 | type of the target as a superclass. If so, we'll need to |
| 223 | offset the object in addition to changing its type. */ |
| 224 | value_ptr v = search_struct_field (type_name_no_tag (type), |
| 225 | arg2, 0, type2, 1); |
| 226 | if (v) |
| 227 | { |
| 228 | VALUE_TYPE (v) = type; |
| 229 | return v; |
| 230 | } |
| 231 | } |
| 232 | if (code1 == TYPE_CODE_FLT && scalar) |
| 233 | return value_from_double (type, value_as_double (arg2)); |
| 234 | else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM |
| 235 | || code1 == TYPE_CODE_RANGE) |
| 236 | && (scalar || code2 == TYPE_CODE_PTR)) |
| 237 | return value_from_longest (type, value_as_long (arg2)); |
| 238 | else if (TYPE_LENGTH (type) == TYPE_LENGTH (type2)) |
| 239 | { |
| 240 | if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR) |
| 241 | { |
| 242 | /* Look in the type of the source to see if it contains the |
| 243 | type of the target as a superclass. If so, we'll need to |
| 244 | offset the pointer rather than just change its type. */ |
| 245 | struct type *t1 = check_typedef (TYPE_TARGET_TYPE (type)); |
| 246 | struct type *t2 = check_typedef (TYPE_TARGET_TYPE (type2)); |
| 247 | if ( TYPE_CODE (t1) == TYPE_CODE_STRUCT |
| 248 | && TYPE_CODE (t2) == TYPE_CODE_STRUCT |
| 249 | && TYPE_NAME (t1) != 0) /* if name unknown, can't have supercl */ |
| 250 | { |
| 251 | value_ptr v = search_struct_field (type_name_no_tag (t1), |
| 252 | value_ind (arg2), 0, t2, 1); |
| 253 | if (v) |
| 254 | { |
| 255 | v = value_addr (v); |
| 256 | VALUE_TYPE (v) = type; |
| 257 | return v; |
| 258 | } |
| 259 | } |
| 260 | /* No superclass found, just fall through to change ptr type. */ |
| 261 | } |
| 262 | VALUE_TYPE (arg2) = type; |
| 263 | return arg2; |
| 264 | } |
| 265 | else if (chill_varying_type (type)) |
| 266 | { |
| 267 | struct type *range1, *range2, *eltype1, *eltype2; |
| 268 | value_ptr val; |
| 269 | int count1, count2; |
| 270 | LONGEST low_bound, high_bound; |
| 271 | char *valaddr, *valaddr_data; |
| 272 | if (code2 == TYPE_CODE_BITSTRING) |
| 273 | error ("not implemented: converting bitstring to varying type"); |
| 274 | if ((code2 != TYPE_CODE_ARRAY && code2 != TYPE_CODE_STRING) |
| 275 | || (eltype1 = check_typedef (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 1))), |
| 276 | eltype2 = check_typedef (TYPE_TARGET_TYPE (type2)), |
| 277 | (TYPE_LENGTH (eltype1) != TYPE_LENGTH (eltype2) |
| 278 | /* || TYPE_CODE (eltype1) != TYPE_CODE (eltype2) */ ))) |
| 279 | error ("Invalid conversion to varying type"); |
| 280 | range1 = TYPE_FIELD_TYPE (TYPE_FIELD_TYPE (type, 1), 0); |
| 281 | range2 = TYPE_FIELD_TYPE (type2, 0); |
| 282 | if (get_discrete_bounds (range1, &low_bound, &high_bound) < 0) |
| 283 | count1 = -1; |
| 284 | else |
| 285 | count1 = high_bound - low_bound + 1; |
| 286 | if (get_discrete_bounds (range2, &low_bound, &high_bound) < 0) |
| 287 | count1 = -1, count2 = 0; /* To force error before */ |
| 288 | else |
| 289 | count2 = high_bound - low_bound + 1; |
| 290 | if (count2 > count1) |
| 291 | error ("target varying type is too small"); |
| 292 | val = allocate_value (type); |
| 293 | valaddr = VALUE_CONTENTS_RAW (val); |
| 294 | valaddr_data = valaddr + TYPE_FIELD_BITPOS (type, 1) / 8; |
| 295 | /* Set val's __var_length field to count2. */ |
| 296 | store_signed_integer (valaddr, TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)), |
| 297 | count2); |
| 298 | /* Set the __var_data field to count2 elements copied from arg2. */ |
| 299 | memcpy (valaddr_data, VALUE_CONTENTS (arg2), |
| 300 | count2 * TYPE_LENGTH (eltype2)); |
| 301 | /* Zero the rest of the __var_data field of val. */ |
| 302 | memset (valaddr_data + count2 * TYPE_LENGTH (eltype2), '\0', |
| 303 | (count1 - count2) * TYPE_LENGTH (eltype2)); |
| 304 | return val; |
| 305 | } |
| 306 | else if (VALUE_LVAL (arg2) == lval_memory) |
| 307 | { |
| 308 | return value_at_lazy (type, VALUE_ADDRESS (arg2) + VALUE_OFFSET (arg2), |
| 309 | VALUE_BFD_SECTION (arg2)); |
| 310 | } |
| 311 | else if (code1 == TYPE_CODE_VOID) |
| 312 | { |
| 313 | return value_zero (builtin_type_void, not_lval); |
| 314 | } |
| 315 | else |
| 316 | { |
| 317 | error ("Invalid cast."); |
| 318 | return 0; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | /* Create a value of type TYPE that is zero, and return it. */ |
| 323 | |
| 324 | value_ptr |
| 325 | value_zero (type, lv) |
| 326 | struct type *type; |
| 327 | enum lval_type lv; |
| 328 | { |
| 329 | register value_ptr val = allocate_value (type); |
| 330 | |
| 331 | memset (VALUE_CONTENTS (val), 0, TYPE_LENGTH (check_typedef (type))); |
| 332 | VALUE_LVAL (val) = lv; |
| 333 | |
| 334 | return val; |
| 335 | } |
| 336 | |
| 337 | /* Return a value with type TYPE located at ADDR. |
| 338 | |
| 339 | Call value_at only if the data needs to be fetched immediately; |
| 340 | if we can be 'lazy' and defer the fetch, perhaps indefinately, call |
| 341 | value_at_lazy instead. value_at_lazy simply records the address of |
| 342 | the data and sets the lazy-evaluation-required flag. The lazy flag |
| 343 | is tested in the VALUE_CONTENTS macro, which is used if and when |
| 344 | the contents are actually required. */ |
| 345 | |
| 346 | value_ptr |
| 347 | value_at (type, addr, sect) |
| 348 | struct type *type; |
| 349 | CORE_ADDR addr; |
| 350 | asection *sect; |
| 351 | { |
| 352 | register value_ptr val; |
| 353 | |
| 354 | if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID) |
| 355 | error ("Attempt to dereference a generic pointer."); |
| 356 | |
| 357 | val = allocate_value (type); |
| 358 | |
| 359 | #ifdef GDB_TARGET_IS_D10V |
| 360 | if (TYPE_TARGET_TYPE(type) && TYPE_CODE(TYPE_TARGET_TYPE(type)) == TYPE_CODE_FUNC) |
| 361 | { |
| 362 | int num; |
| 363 | short snum; |
| 364 | read_memory (addr, (char *)&snum, 2); |
| 365 | num = D10V_MAKE_IADDR(snum); |
| 366 | memcpy( VALUE_CONTENTS_RAW (val), &num, 4); |
| 367 | } |
| 368 | else |
| 369 | #endif |
| 370 | |
| 371 | read_memory_section (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (type), sect); |
| 372 | |
| 373 | VALUE_LVAL (val) = lval_memory; |
| 374 | VALUE_ADDRESS (val) = addr; |
| 375 | VALUE_BFD_SECTION (val) = sect; |
| 376 | |
| 377 | return val; |
| 378 | } |
| 379 | |
| 380 | /* Return a lazy value with type TYPE located at ADDR (cf. value_at). */ |
| 381 | |
| 382 | value_ptr |
| 383 | value_at_lazy (type, addr, sect) |
| 384 | struct type *type; |
| 385 | CORE_ADDR addr; |
| 386 | asection *sect; |
| 387 | { |
| 388 | register value_ptr val; |
| 389 | |
| 390 | if (TYPE_CODE (check_typedef (type)) == TYPE_CODE_VOID) |
| 391 | error ("Attempt to dereference a generic pointer."); |
| 392 | |
| 393 | val = allocate_value (type); |
| 394 | |
| 395 | VALUE_LVAL (val) = lval_memory; |
| 396 | VALUE_ADDRESS (val) = addr; |
| 397 | VALUE_LAZY (val) = 1; |
| 398 | VALUE_BFD_SECTION (val) = sect; |
| 399 | |
| 400 | return val; |
| 401 | } |
| 402 | |
| 403 | /* Called only from the VALUE_CONTENTS macro, if the current data for |
| 404 | a variable needs to be loaded into VALUE_CONTENTS(VAL). Fetches the |
| 405 | data from the user's process, and clears the lazy flag to indicate |
| 406 | that the data in the buffer is valid. |
| 407 | |
| 408 | If the value is zero-length, we avoid calling read_memory, which would |
| 409 | abort. We mark the value as fetched anyway -- all 0 bytes of it. |
| 410 | |
| 411 | This function returns a value because it is used in the VALUE_CONTENTS |
| 412 | macro as part of an expression, where a void would not work. The |
| 413 | value is ignored. */ |
| 414 | |
| 415 | int |
| 416 | value_fetch_lazy (val) |
| 417 | register value_ptr val; |
| 418 | { |
| 419 | CORE_ADDR addr = VALUE_ADDRESS (val) + VALUE_OFFSET (val); |
| 420 | int length = TYPE_LENGTH (VALUE_TYPE (val)); |
| 421 | |
| 422 | #ifdef GDB_TARGET_IS_D10V |
| 423 | struct type *type = VALUE_TYPE(val); |
| 424 | if (TYPE_TARGET_TYPE(type) && TYPE_CODE(TYPE_TARGET_TYPE(type)) == TYPE_CODE_FUNC) |
| 425 | { |
| 426 | int num; |
| 427 | short snum; |
| 428 | read_memory (addr, (char *)&snum, 2); |
| 429 | num = D10V_MAKE_IADDR(snum); |
| 430 | memcpy( VALUE_CONTENTS_RAW (val), &num, 4); |
| 431 | } |
| 432 | else |
| 433 | #endif |
| 434 | |
| 435 | if (length) |
| 436 | read_memory_section (addr, VALUE_CONTENTS_RAW (val), length, |
| 437 | VALUE_BFD_SECTION (val)); |
| 438 | VALUE_LAZY (val) = 0; |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | |
| 443 | /* Store the contents of FROMVAL into the location of TOVAL. |
| 444 | Return a new value with the location of TOVAL and contents of FROMVAL. */ |
| 445 | |
| 446 | value_ptr |
| 447 | value_assign (toval, fromval) |
| 448 | register value_ptr toval, fromval; |
| 449 | { |
| 450 | register struct type *type; |
| 451 | register value_ptr val; |
| 452 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; |
| 453 | int use_buffer = 0; |
| 454 | |
| 455 | if (!toval->modifiable) |
| 456 | error ("Left operand of assignment is not a modifiable lvalue."); |
| 457 | |
| 458 | COERCE_REF (toval); |
| 459 | |
| 460 | type = VALUE_TYPE (toval); |
| 461 | if (VALUE_LVAL (toval) != lval_internalvar) |
| 462 | fromval = value_cast (type, fromval); |
| 463 | else |
| 464 | COERCE_ARRAY (fromval); |
| 465 | CHECK_TYPEDEF (type); |
| 466 | |
| 467 | /* If TOVAL is a special machine register requiring conversion |
| 468 | of program values to a special raw format, |
| 469 | convert FROMVAL's contents now, with result in `raw_buffer', |
| 470 | and set USE_BUFFER to the number of bytes to write. */ |
| 471 | |
| 472 | #ifdef REGISTER_CONVERTIBLE |
| 473 | if (VALUE_REGNO (toval) >= 0 |
| 474 | && REGISTER_CONVERTIBLE (VALUE_REGNO (toval))) |
| 475 | { |
| 476 | int regno = VALUE_REGNO (toval); |
| 477 | if (REGISTER_CONVERTIBLE (regno)) |
| 478 | { |
| 479 | struct type *fromtype = check_typedef (VALUE_TYPE (fromval)); |
| 480 | REGISTER_CONVERT_TO_RAW (fromtype, regno, |
| 481 | VALUE_CONTENTS (fromval), raw_buffer); |
| 482 | use_buffer = REGISTER_RAW_SIZE (regno); |
| 483 | } |
| 484 | } |
| 485 | #endif |
| 486 | |
| 487 | switch (VALUE_LVAL (toval)) |
| 488 | { |
| 489 | case lval_internalvar: |
| 490 | set_internalvar (VALUE_INTERNALVAR (toval), fromval); |
| 491 | return value_copy (VALUE_INTERNALVAR (toval)->value); |
| 492 | |
| 493 | case lval_internalvar_component: |
| 494 | set_internalvar_component (VALUE_INTERNALVAR (toval), |
| 495 | VALUE_OFFSET (toval), |
| 496 | VALUE_BITPOS (toval), |
| 497 | VALUE_BITSIZE (toval), |
| 498 | fromval); |
| 499 | break; |
| 500 | |
| 501 | case lval_memory: |
| 502 | if (VALUE_BITSIZE (toval)) |
| 503 | { |
| 504 | char buffer[sizeof (LONGEST)]; |
| 505 | /* We assume that the argument to read_memory is in units of |
| 506 | host chars. FIXME: Is that correct? */ |
| 507 | int len = (VALUE_BITPOS (toval) |
| 508 | + VALUE_BITSIZE (toval) |
| 509 | + HOST_CHAR_BIT - 1) |
| 510 | / HOST_CHAR_BIT; |
| 511 | |
| 512 | if (len > (int) sizeof (LONGEST)) |
| 513 | error ("Can't handle bitfields which don't fit in a %d bit word.", |
| 514 | sizeof (LONGEST) * HOST_CHAR_BIT); |
| 515 | |
| 516 | read_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 517 | buffer, len); |
| 518 | modify_field (buffer, value_as_long (fromval), |
| 519 | VALUE_BITPOS (toval), VALUE_BITSIZE (toval)); |
| 520 | write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 521 | buffer, len); |
| 522 | } |
| 523 | else if (use_buffer) |
| 524 | write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 525 | raw_buffer, use_buffer); |
| 526 | else |
| 527 | write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 528 | VALUE_CONTENTS (fromval), TYPE_LENGTH (type)); |
| 529 | break; |
| 530 | |
| 531 | case lval_register: |
| 532 | if (VALUE_BITSIZE (toval)) |
| 533 | { |
| 534 | char buffer[sizeof (LONGEST)]; |
| 535 | int len = REGISTER_RAW_SIZE (VALUE_REGNO (toval)); |
| 536 | |
| 537 | if (len > (int) sizeof (LONGEST)) |
| 538 | error ("Can't handle bitfields in registers larger than %d bits.", |
| 539 | sizeof (LONGEST) * HOST_CHAR_BIT); |
| 540 | |
| 541 | if (VALUE_BITPOS (toval) + VALUE_BITSIZE (toval) |
| 542 | > len * HOST_CHAR_BIT) |
| 543 | /* Getting this right would involve being very careful about |
| 544 | byte order. */ |
| 545 | error ("\ |
| 546 | Can't handle bitfield which doesn't fit in a single register."); |
| 547 | |
| 548 | read_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 549 | buffer, len); |
| 550 | modify_field (buffer, value_as_long (fromval), |
| 551 | VALUE_BITPOS (toval), VALUE_BITSIZE (toval)); |
| 552 | write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 553 | buffer, len); |
| 554 | } |
| 555 | else if (use_buffer) |
| 556 | write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 557 | raw_buffer, use_buffer); |
| 558 | else |
| 559 | { |
| 560 | /* Do any conversion necessary when storing this type to more |
| 561 | than one register. */ |
| 562 | #ifdef REGISTER_CONVERT_FROM_TYPE |
| 563 | memcpy (raw_buffer, VALUE_CONTENTS (fromval), TYPE_LENGTH (type)); |
| 564 | REGISTER_CONVERT_FROM_TYPE(VALUE_REGNO (toval), type, raw_buffer); |
| 565 | write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 566 | raw_buffer, TYPE_LENGTH (type)); |
| 567 | #else |
| 568 | write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 569 | VALUE_CONTENTS (fromval), TYPE_LENGTH (type)); |
| 570 | #endif |
| 571 | } |
| 572 | /* Assigning to the stack pointer, frame pointer, and other |
| 573 | (architecture and calling convention specific) registers may |
| 574 | cause the frame cache to be out of date. We just do this |
| 575 | on all assignments to registers for simplicity; I doubt the slowdown |
| 576 | matters. */ |
| 577 | reinit_frame_cache (); |
| 578 | break; |
| 579 | |
| 580 | case lval_reg_frame_relative: |
| 581 | { |
| 582 | /* value is stored in a series of registers in the frame |
| 583 | specified by the structure. Copy that value out, modify |
| 584 | it, and copy it back in. */ |
| 585 | int amount_to_copy = (VALUE_BITSIZE (toval) ? 1 : TYPE_LENGTH (type)); |
| 586 | int reg_size = REGISTER_RAW_SIZE (VALUE_FRAME_REGNUM (toval)); |
| 587 | int byte_offset = VALUE_OFFSET (toval) % reg_size; |
| 588 | int reg_offset = VALUE_OFFSET (toval) / reg_size; |
| 589 | int amount_copied; |
| 590 | |
| 591 | /* Make the buffer large enough in all cases. */ |
| 592 | char *buffer = (char *) alloca (amount_to_copy |
| 593 | + sizeof (LONGEST) |
| 594 | + MAX_REGISTER_RAW_SIZE); |
| 595 | |
| 596 | int regno; |
| 597 | struct frame_info *frame; |
| 598 | |
| 599 | /* Figure out which frame this is in currently. */ |
| 600 | for (frame = get_current_frame (); |
| 601 | frame && FRAME_FP (frame) != VALUE_FRAME (toval); |
| 602 | frame = get_prev_frame (frame)) |
| 603 | ; |
| 604 | |
| 605 | if (!frame) |
| 606 | error ("Value being assigned to is no longer active."); |
| 607 | |
| 608 | amount_to_copy += (reg_size - amount_to_copy % reg_size); |
| 609 | |
| 610 | /* Copy it out. */ |
| 611 | for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset, |
| 612 | amount_copied = 0); |
| 613 | amount_copied < amount_to_copy; |
| 614 | amount_copied += reg_size, regno++) |
| 615 | { |
| 616 | get_saved_register (buffer + amount_copied, |
| 617 | (int *)NULL, (CORE_ADDR *)NULL, |
| 618 | frame, regno, (enum lval_type *)NULL); |
| 619 | } |
| 620 | |
| 621 | /* Modify what needs to be modified. */ |
| 622 | if (VALUE_BITSIZE (toval)) |
| 623 | modify_field (buffer + byte_offset, |
| 624 | value_as_long (fromval), |
| 625 | VALUE_BITPOS (toval), VALUE_BITSIZE (toval)); |
| 626 | else if (use_buffer) |
| 627 | memcpy (buffer + byte_offset, raw_buffer, use_buffer); |
| 628 | else |
| 629 | memcpy (buffer + byte_offset, VALUE_CONTENTS (fromval), |
| 630 | TYPE_LENGTH (type)); |
| 631 | |
| 632 | /* Copy it back. */ |
| 633 | for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset, |
| 634 | amount_copied = 0); |
| 635 | amount_copied < amount_to_copy; |
| 636 | amount_copied += reg_size, regno++) |
| 637 | { |
| 638 | enum lval_type lval; |
| 639 | CORE_ADDR addr; |
| 640 | int optim; |
| 641 | |
| 642 | /* Just find out where to put it. */ |
| 643 | get_saved_register ((char *)NULL, |
| 644 | &optim, &addr, frame, regno, &lval); |
| 645 | |
| 646 | if (optim) |
| 647 | error ("Attempt to assign to a value that was optimized out."); |
| 648 | if (lval == lval_memory) |
| 649 | write_memory (addr, buffer + amount_copied, reg_size); |
| 650 | else if (lval == lval_register) |
| 651 | write_register_bytes (addr, buffer + amount_copied, reg_size); |
| 652 | else |
| 653 | error ("Attempt to assign to an unmodifiable value."); |
| 654 | } |
| 655 | } |
| 656 | break; |
| 657 | |
| 658 | |
| 659 | default: |
| 660 | error ("Left operand of assignment is not an lvalue."); |
| 661 | } |
| 662 | |
| 663 | /* If the field does not entirely fill a LONGEST, then zero the sign bits. |
| 664 | If the field is signed, and is negative, then sign extend. */ |
| 665 | if ((VALUE_BITSIZE (toval) > 0) |
| 666 | && (VALUE_BITSIZE (toval) < 8 * (int) sizeof (LONGEST))) |
| 667 | { |
| 668 | LONGEST fieldval = value_as_long (fromval); |
| 669 | LONGEST valmask = (((ULONGEST) 1) << VALUE_BITSIZE (toval)) - 1; |
| 670 | |
| 671 | fieldval &= valmask; |
| 672 | if (!TYPE_UNSIGNED (type) && (fieldval & (valmask ^ (valmask >> 1)))) |
| 673 | fieldval |= ~valmask; |
| 674 | |
| 675 | fromval = value_from_longest (type, fieldval); |
| 676 | } |
| 677 | |
| 678 | val = value_copy (toval); |
| 679 | memcpy (VALUE_CONTENTS_RAW (val), VALUE_CONTENTS (fromval), |
| 680 | TYPE_LENGTH (type)); |
| 681 | VALUE_TYPE (val) = type; |
| 682 | |
| 683 | return val; |
| 684 | } |
| 685 | |
| 686 | /* Extend a value VAL to COUNT repetitions of its type. */ |
| 687 | |
| 688 | value_ptr |
| 689 | value_repeat (arg1, count) |
| 690 | value_ptr arg1; |
| 691 | int count; |
| 692 | { |
| 693 | register value_ptr val; |
| 694 | |
| 695 | if (VALUE_LVAL (arg1) != lval_memory) |
| 696 | error ("Only values in memory can be extended with '@'."); |
| 697 | if (count < 1) |
| 698 | error ("Invalid number %d of repetitions.", count); |
| 699 | |
| 700 | val = allocate_repeat_value (VALUE_TYPE (arg1), count); |
| 701 | |
| 702 | read_memory (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1), |
| 703 | VALUE_CONTENTS_RAW (val), |
| 704 | TYPE_LENGTH (VALUE_TYPE (val))); |
| 705 | VALUE_LVAL (val) = lval_memory; |
| 706 | VALUE_ADDRESS (val) = VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1); |
| 707 | |
| 708 | return val; |
| 709 | } |
| 710 | |
| 711 | value_ptr |
| 712 | value_of_variable (var, b) |
| 713 | struct symbol *var; |
| 714 | struct block *b; |
| 715 | { |
| 716 | value_ptr val; |
| 717 | struct frame_info *frame = NULL; |
| 718 | |
| 719 | if (!b) |
| 720 | frame = NULL; /* Use selected frame. */ |
| 721 | else if (symbol_read_needs_frame (var)) |
| 722 | { |
| 723 | frame = block_innermost_frame (b); |
| 724 | if (!frame) |
| 725 | if (BLOCK_FUNCTION (b) |
| 726 | && SYMBOL_NAME (BLOCK_FUNCTION (b))) |
| 727 | error ("No frame is currently executing in block %s.", |
| 728 | SYMBOL_NAME (BLOCK_FUNCTION (b))); |
| 729 | else |
| 730 | error ("No frame is currently executing in specified block"); |
| 731 | } |
| 732 | |
| 733 | val = read_var_value (var, frame); |
| 734 | if (!val) |
| 735 | error ("Address of symbol \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var)); |
| 736 | |
| 737 | return val; |
| 738 | } |
| 739 | |
| 740 | /* Given a value which is an array, return a value which is a pointer to its |
| 741 | first element, regardless of whether or not the array has a nonzero lower |
| 742 | bound. |
| 743 | |
| 744 | FIXME: A previous comment here indicated that this routine should be |
| 745 | substracting the array's lower bound. It's not clear to me that this |
| 746 | is correct. Given an array subscripting operation, it would certainly |
| 747 | work to do the adjustment here, essentially computing: |
| 748 | |
| 749 | (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0]) |
| 750 | |
| 751 | However I believe a more appropriate and logical place to account for |
| 752 | the lower bound is to do so in value_subscript, essentially computing: |
| 753 | |
| 754 | (&array[0] + ((index - lowerbound) * sizeof array[0])) |
| 755 | |
| 756 | As further evidence consider what would happen with operations other |
| 757 | than array subscripting, where the caller would get back a value that |
| 758 | had an address somewhere before the actual first element of the array, |
| 759 | and the information about the lower bound would be lost because of |
| 760 | the coercion to pointer type. |
| 761 | */ |
| 762 | |
| 763 | value_ptr |
| 764 | value_coerce_array (arg1) |
| 765 | value_ptr arg1; |
| 766 | { |
| 767 | register struct type *type = check_typedef (VALUE_TYPE (arg1)); |
| 768 | |
| 769 | if (VALUE_LVAL (arg1) != lval_memory) |
| 770 | error ("Attempt to take address of value not located in memory."); |
| 771 | |
| 772 | return value_from_longest (lookup_pointer_type (TYPE_TARGET_TYPE (type)), |
| 773 | (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1))); |
| 774 | } |
| 775 | |
| 776 | /* Given a value which is a function, return a value which is a pointer |
| 777 | to it. */ |
| 778 | |
| 779 | value_ptr |
| 780 | value_coerce_function (arg1) |
| 781 | value_ptr arg1; |
| 782 | { |
| 783 | value_ptr retval; |
| 784 | |
| 785 | if (VALUE_LVAL (arg1) != lval_memory) |
| 786 | error ("Attempt to take address of value not located in memory."); |
| 787 | |
| 788 | retval = value_from_longest (lookup_pointer_type (VALUE_TYPE (arg1)), |
| 789 | (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1))); |
| 790 | VALUE_BFD_SECTION (retval) = VALUE_BFD_SECTION (arg1); |
| 791 | return retval; |
| 792 | } |
| 793 | |
| 794 | /* Return a pointer value for the object for which ARG1 is the contents. */ |
| 795 | |
| 796 | value_ptr |
| 797 | value_addr (arg1) |
| 798 | value_ptr arg1; |
| 799 | { |
| 800 | value_ptr retval; |
| 801 | |
| 802 | struct type *type = check_typedef (VALUE_TYPE (arg1)); |
| 803 | if (TYPE_CODE (type) == TYPE_CODE_REF) |
| 804 | { |
| 805 | /* Copy the value, but change the type from (T&) to (T*). |
| 806 | We keep the same location information, which is efficient, |
| 807 | and allows &(&X) to get the location containing the reference. */ |
| 808 | value_ptr arg2 = value_copy (arg1); |
| 809 | VALUE_TYPE (arg2) = lookup_pointer_type (TYPE_TARGET_TYPE (type)); |
| 810 | return arg2; |
| 811 | } |
| 812 | if (TYPE_CODE (type) == TYPE_CODE_FUNC) |
| 813 | return value_coerce_function (arg1); |
| 814 | |
| 815 | if (VALUE_LVAL (arg1) != lval_memory) |
| 816 | error ("Attempt to take address of value not located in memory."); |
| 817 | |
| 818 | retval = value_from_longest (lookup_pointer_type (VALUE_TYPE (arg1)), |
| 819 | (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1))); |
| 820 | VALUE_BFD_SECTION (retval) = VALUE_BFD_SECTION (arg1); |
| 821 | return retval; |
| 822 | } |
| 823 | |
| 824 | /* Given a value of a pointer type, apply the C unary * operator to it. */ |
| 825 | |
| 826 | value_ptr |
| 827 | value_ind (arg1) |
| 828 | value_ptr arg1; |
| 829 | { |
| 830 | struct type *type1; |
| 831 | COERCE_ARRAY (arg1); |
| 832 | type1 = check_typedef (VALUE_TYPE (arg1)); |
| 833 | |
| 834 | if (TYPE_CODE (type1) == TYPE_CODE_MEMBER) |
| 835 | error ("not implemented: member types in value_ind"); |
| 836 | |
| 837 | /* Allow * on an integer so we can cast it to whatever we want. |
| 838 | This returns an int, which seems like the most C-like thing |
| 839 | to do. "long long" variables are rare enough that |
| 840 | BUILTIN_TYPE_LONGEST would seem to be a mistake. */ |
| 841 | if (TYPE_CODE (type1) == TYPE_CODE_INT) |
| 842 | return value_at (builtin_type_int, |
| 843 | (CORE_ADDR) value_as_long (arg1), |
| 844 | VALUE_BFD_SECTION (arg1)); |
| 845 | else if (TYPE_CODE (type1) == TYPE_CODE_PTR) |
| 846 | return value_at_lazy (TYPE_TARGET_TYPE (type1), value_as_pointer (arg1), |
| 847 | VALUE_BFD_SECTION (arg1)); |
| 848 | error ("Attempt to take contents of a non-pointer value."); |
| 849 | return 0; /* For lint -- never reached */ |
| 850 | } |
| 851 | \f |
| 852 | /* Pushing small parts of stack frames. */ |
| 853 | |
| 854 | /* Push one word (the size of object that a register holds). */ |
| 855 | |
| 856 | CORE_ADDR |
| 857 | push_word (sp, word) |
| 858 | CORE_ADDR sp; |
| 859 | ULONGEST word; |
| 860 | { |
| 861 | register int len = REGISTER_SIZE; |
| 862 | char buffer[MAX_REGISTER_RAW_SIZE]; |
| 863 | |
| 864 | store_unsigned_integer (buffer, len, word); |
| 865 | #if 1 INNER_THAN 2 |
| 866 | sp -= len; |
| 867 | write_memory (sp, buffer, len); |
| 868 | #else /* stack grows upward */ |
| 869 | write_memory (sp, buffer, len); |
| 870 | sp += len; |
| 871 | #endif /* stack grows upward */ |
| 872 | |
| 873 | return sp; |
| 874 | } |
| 875 | |
| 876 | /* Push LEN bytes with data at BUFFER. */ |
| 877 | |
| 878 | CORE_ADDR |
| 879 | push_bytes (sp, buffer, len) |
| 880 | CORE_ADDR sp; |
| 881 | char *buffer; |
| 882 | int len; |
| 883 | { |
| 884 | #if 1 INNER_THAN 2 |
| 885 | sp -= len; |
| 886 | write_memory (sp, buffer, len); |
| 887 | #else /* stack grows upward */ |
| 888 | write_memory (sp, buffer, len); |
| 889 | sp += len; |
| 890 | #endif /* stack grows upward */ |
| 891 | |
| 892 | return sp; |
| 893 | } |
| 894 | |
| 895 | /* Push onto the stack the specified value VALUE. */ |
| 896 | |
| 897 | #ifndef PUSH_ARGUMENTS |
| 898 | |
| 899 | static CORE_ADDR |
| 900 | value_push (sp, arg) |
| 901 | register CORE_ADDR sp; |
| 902 | value_ptr arg; |
| 903 | { |
| 904 | register int len = TYPE_LENGTH (VALUE_TYPE (arg)); |
| 905 | |
| 906 | #if 1 INNER_THAN 2 |
| 907 | sp -= len; |
| 908 | write_memory (sp, VALUE_CONTENTS (arg), len); |
| 909 | #else /* stack grows upward */ |
| 910 | write_memory (sp, VALUE_CONTENTS (arg), len); |
| 911 | sp += len; |
| 912 | #endif /* stack grows upward */ |
| 913 | |
| 914 | return sp; |
| 915 | } |
| 916 | |
| 917 | #endif /* !PUSH_ARGUMENTS */ |
| 918 | |
| 919 | #ifdef CALL_DUMMY |
| 920 | /* Perform the standard coercions that are specified |
| 921 | for arguments to be passed to C functions. |
| 922 | |
| 923 | If PARAM_TYPE is non-NULL, it is the expected parameter type. */ |
| 924 | |
| 925 | static value_ptr |
| 926 | value_arg_coerce (arg, param_type) |
| 927 | value_ptr arg; |
| 928 | struct type *param_type; |
| 929 | { |
| 930 | register struct type *arg_type = check_typedef (VALUE_TYPE (arg)); |
| 931 | register struct type *type |
| 932 | = param_type ? check_typedef (param_type) : arg_type; |
| 933 | |
| 934 | switch (TYPE_CODE (type)) |
| 935 | { |
| 936 | case TYPE_CODE_REF: |
| 937 | if (TYPE_CODE (arg_type) != TYPE_CODE_REF) |
| 938 | { |
| 939 | arg = value_addr (arg); |
| 940 | VALUE_TYPE (arg) = param_type; |
| 941 | return arg; |
| 942 | } |
| 943 | break; |
| 944 | case TYPE_CODE_INT: |
| 945 | case TYPE_CODE_CHAR: |
| 946 | case TYPE_CODE_BOOL: |
| 947 | case TYPE_CODE_ENUM: |
| 948 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) |
| 949 | type = builtin_type_int; |
| 950 | break; |
| 951 | case TYPE_CODE_FLT: |
| 952 | /* coerce float to double, unless the function prototype specifies float */ |
| 953 | if (COERCE_FLOAT_TO_DOUBLE) |
| 954 | { |
| 955 | if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double)) |
| 956 | type = builtin_type_double; |
| 957 | else if (TYPE_LENGTH (type) > TYPE_LENGTH (builtin_type_double)) |
| 958 | type = builtin_type_long_double; |
| 959 | } |
| 960 | break; |
| 961 | case TYPE_CODE_FUNC: |
| 962 | type = lookup_pointer_type (type); |
| 963 | break; |
| 964 | case TYPE_CODE_ARRAY: |
| 965 | if (current_language->c_style_arrays) |
| 966 | type = lookup_pointer_type (TYPE_TARGET_TYPE (type)); |
| 967 | break; |
| 968 | case TYPE_CODE_UNDEF: |
| 969 | case TYPE_CODE_PTR: |
| 970 | case TYPE_CODE_STRUCT: |
| 971 | case TYPE_CODE_UNION: |
| 972 | case TYPE_CODE_VOID: |
| 973 | case TYPE_CODE_SET: |
| 974 | case TYPE_CODE_RANGE: |
| 975 | case TYPE_CODE_STRING: |
| 976 | case TYPE_CODE_BITSTRING: |
| 977 | case TYPE_CODE_ERROR: |
| 978 | case TYPE_CODE_MEMBER: |
| 979 | case TYPE_CODE_METHOD: |
| 980 | case TYPE_CODE_COMPLEX: |
| 981 | default: |
| 982 | break; |
| 983 | } |
| 984 | |
| 985 | return value_cast (type, arg); |
| 986 | } |
| 987 | |
| 988 | /* Determine a function's address and its return type from its value. |
| 989 | Calls error() if the function is not valid for calling. */ |
| 990 | |
| 991 | static CORE_ADDR |
| 992 | find_function_addr (function, retval_type) |
| 993 | value_ptr function; |
| 994 | struct type **retval_type; |
| 995 | { |
| 996 | register struct type *ftype = check_typedef (VALUE_TYPE (function)); |
| 997 | register enum type_code code = TYPE_CODE (ftype); |
| 998 | struct type *value_type; |
| 999 | CORE_ADDR funaddr; |
| 1000 | |
| 1001 | /* If it's a member function, just look at the function |
| 1002 | part of it. */ |
| 1003 | |
| 1004 | /* Determine address to call. */ |
| 1005 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) |
| 1006 | { |
| 1007 | funaddr = VALUE_ADDRESS (function); |
| 1008 | value_type = TYPE_TARGET_TYPE (ftype); |
| 1009 | } |
| 1010 | else if (code == TYPE_CODE_PTR) |
| 1011 | { |
| 1012 | funaddr = value_as_pointer (function); |
| 1013 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
| 1014 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 1015 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) |
| 1016 | { |
| 1017 | #ifdef CONVERT_FROM_FUNC_PTR_ADDR |
| 1018 | /* FIXME: This is a workaround for the unusual function |
| 1019 | pointer representation on the RS/6000, see comment |
| 1020 | in config/rs6000/tm-rs6000.h */ |
| 1021 | funaddr = CONVERT_FROM_FUNC_PTR_ADDR (funaddr); |
| 1022 | #endif |
| 1023 | value_type = TYPE_TARGET_TYPE (ftype); |
| 1024 | } |
| 1025 | else |
| 1026 | value_type = builtin_type_int; |
| 1027 | } |
| 1028 | else if (code == TYPE_CODE_INT) |
| 1029 | { |
| 1030 | /* Handle the case of functions lacking debugging info. |
| 1031 | Their values are characters since their addresses are char */ |
| 1032 | if (TYPE_LENGTH (ftype) == 1) |
| 1033 | funaddr = value_as_pointer (value_addr (function)); |
| 1034 | else |
| 1035 | /* Handle integer used as address of a function. */ |
| 1036 | funaddr = (CORE_ADDR) value_as_long (function); |
| 1037 | |
| 1038 | value_type = builtin_type_int; |
| 1039 | } |
| 1040 | else |
| 1041 | error ("Invalid data type for function to be called."); |
| 1042 | |
| 1043 | *retval_type = value_type; |
| 1044 | return funaddr; |
| 1045 | } |
| 1046 | |
| 1047 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
| 1048 | (why not just save registers in GDB?). The purpose of pushing a dummy |
| 1049 | frame which looks just like a real frame is so that if you call a |
| 1050 | function and then hit a breakpoint (get a signal, etc), "backtrace" |
| 1051 | will look right. Whether the backtrace needs to actually show the |
| 1052 | stack at the time the inferior function was called is debatable, but |
| 1053 | it certainly needs to not display garbage. So if you are contemplating |
| 1054 | making dummy frames be different from normal frames, consider that. */ |
| 1055 | |
| 1056 | /* Perform a function call in the inferior. |
| 1057 | ARGS is a vector of values of arguments (NARGS of them). |
| 1058 | FUNCTION is a value, the function to be called. |
| 1059 | Returns a value representing what the function returned. |
| 1060 | May fail to return, if a breakpoint or signal is hit |
| 1061 | during the execution of the function. |
| 1062 | |
| 1063 | ARGS is modified to contain coerced values. */ |
| 1064 | |
| 1065 | value_ptr |
| 1066 | call_function_by_hand (function, nargs, args) |
| 1067 | value_ptr function; |
| 1068 | int nargs; |
| 1069 | value_ptr *args; |
| 1070 | { |
| 1071 | register CORE_ADDR sp; |
| 1072 | register int i; |
| 1073 | CORE_ADDR start_sp; |
| 1074 | /* CALL_DUMMY is an array of words (REGISTER_SIZE), but each word |
| 1075 | is in host byte order. Before calling FIX_CALL_DUMMY, we byteswap it |
| 1076 | and remove any extra bytes which might exist because ULONGEST is |
| 1077 | bigger than REGISTER_SIZE. */ |
| 1078 | static ULONGEST dummy[] = CALL_DUMMY; |
| 1079 | char dummy1[REGISTER_SIZE * sizeof dummy / sizeof (ULONGEST)]; |
| 1080 | CORE_ADDR old_sp; |
| 1081 | struct type *value_type; |
| 1082 | unsigned char struct_return; |
| 1083 | CORE_ADDR struct_addr = 0; |
| 1084 | struct inferior_status inf_status; |
| 1085 | struct cleanup *old_chain; |
| 1086 | CORE_ADDR funaddr; |
| 1087 | int using_gcc; /* Set to version of gcc in use, or zero if not gcc */ |
| 1088 | CORE_ADDR real_pc; |
| 1089 | struct type *ftype = check_typedef (SYMBOL_TYPE (function)); |
| 1090 | |
| 1091 | if (!target_has_execution) |
| 1092 | noprocess(); |
| 1093 | |
| 1094 | save_inferior_status (&inf_status, 1); |
| 1095 | old_chain = make_cleanup (restore_inferior_status, &inf_status); |
| 1096 | |
| 1097 | /* PUSH_DUMMY_FRAME is responsible for saving the inferior registers |
| 1098 | (and POP_FRAME for restoring them). (At least on most machines) |
| 1099 | they are saved on the stack in the inferior. */ |
| 1100 | PUSH_DUMMY_FRAME; |
| 1101 | |
| 1102 | old_sp = sp = read_sp (); |
| 1103 | |
| 1104 | #if 1 INNER_THAN 2 /* Stack grows down */ |
| 1105 | sp -= sizeof dummy1; |
| 1106 | start_sp = sp; |
| 1107 | #else /* Stack grows up */ |
| 1108 | start_sp = sp; |
| 1109 | sp += sizeof dummy1; |
| 1110 | #endif |
| 1111 | |
| 1112 | funaddr = find_function_addr (function, &value_type); |
| 1113 | CHECK_TYPEDEF (value_type); |
| 1114 | |
| 1115 | { |
| 1116 | struct block *b = block_for_pc (funaddr); |
| 1117 | /* If compiled without -g, assume GCC 2. */ |
| 1118 | using_gcc = (b == NULL ? 2 : BLOCK_GCC_COMPILED (b)); |
| 1119 | } |
| 1120 | |
| 1121 | /* Are we returning a value using a structure return or a normal |
| 1122 | value return? */ |
| 1123 | |
| 1124 | struct_return = using_struct_return (function, funaddr, value_type, |
| 1125 | using_gcc); |
| 1126 | |
| 1127 | /* Create a call sequence customized for this function |
| 1128 | and the number of arguments for it. */ |
| 1129 | for (i = 0; i < (int) (sizeof (dummy) / sizeof (dummy[0])); i++) |
| 1130 | store_unsigned_integer (&dummy1[i * REGISTER_SIZE], |
| 1131 | REGISTER_SIZE, |
| 1132 | (ULONGEST)dummy[i]); |
| 1133 | |
| 1134 | #ifdef GDB_TARGET_IS_HPPA |
| 1135 | real_pc = FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args, |
| 1136 | value_type, using_gcc); |
| 1137 | #else |
| 1138 | FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args, |
| 1139 | value_type, using_gcc); |
| 1140 | real_pc = start_sp; |
| 1141 | #endif |
| 1142 | |
| 1143 | #if CALL_DUMMY_LOCATION == ON_STACK |
| 1144 | write_memory (start_sp, (char *)dummy1, sizeof dummy1); |
| 1145 | #endif /* On stack. */ |
| 1146 | |
| 1147 | #if CALL_DUMMY_LOCATION == BEFORE_TEXT_END |
| 1148 | /* Convex Unix prohibits executing in the stack segment. */ |
| 1149 | /* Hope there is empty room at the top of the text segment. */ |
| 1150 | { |
| 1151 | extern CORE_ADDR text_end; |
| 1152 | static checked = 0; |
| 1153 | if (!checked) |
| 1154 | for (start_sp = text_end - sizeof dummy1; start_sp < text_end; ++start_sp) |
| 1155 | if (read_memory_integer (start_sp, 1) != 0) |
| 1156 | error ("text segment full -- no place to put call"); |
| 1157 | checked = 1; |
| 1158 | sp = old_sp; |
| 1159 | real_pc = text_end - sizeof dummy1; |
| 1160 | write_memory (real_pc, (char *)dummy1, sizeof dummy1); |
| 1161 | } |
| 1162 | #endif /* Before text_end. */ |
| 1163 | |
| 1164 | #if CALL_DUMMY_LOCATION == AFTER_TEXT_END |
| 1165 | { |
| 1166 | extern CORE_ADDR text_end; |
| 1167 | int errcode; |
| 1168 | sp = old_sp; |
| 1169 | real_pc = text_end; |
| 1170 | errcode = target_write_memory (real_pc, (char *)dummy1, sizeof dummy1); |
| 1171 | if (errcode != 0) |
| 1172 | error ("Cannot write text segment -- call_function failed"); |
| 1173 | } |
| 1174 | #endif /* After text_end. */ |
| 1175 | |
| 1176 | #if CALL_DUMMY_LOCATION == AT_ENTRY_POINT |
| 1177 | real_pc = funaddr; |
| 1178 | #endif /* At entry point. */ |
| 1179 | |
| 1180 | #ifdef lint |
| 1181 | sp = old_sp; /* It really is used, for some ifdef's... */ |
| 1182 | #endif |
| 1183 | |
| 1184 | if (nargs < TYPE_NFIELDS (ftype)) |
| 1185 | error ("too few arguments in function call"); |
| 1186 | |
| 1187 | for (i = nargs - 1; i >= 0; i--) |
| 1188 | { |
| 1189 | struct type *param_type; |
| 1190 | if (TYPE_NFIELDS (ftype) > i) |
| 1191 | param_type = TYPE_FIELD_TYPE (ftype, i); |
| 1192 | else |
| 1193 | param_type = 0; |
| 1194 | args[i] = value_arg_coerce (args[i], param_type); |
| 1195 | } |
| 1196 | |
| 1197 | #if defined (REG_STRUCT_HAS_ADDR) |
| 1198 | { |
| 1199 | /* This is a machine like the sparc, where we may need to pass a pointer |
| 1200 | to the structure, not the structure itself. */ |
| 1201 | for (i = nargs - 1; i >= 0; i--) |
| 1202 | { |
| 1203 | struct type *arg_type = check_typedef (VALUE_TYPE (args[i])); |
| 1204 | if ((TYPE_CODE (arg_type) == TYPE_CODE_STRUCT |
| 1205 | || TYPE_CODE (arg_type) == TYPE_CODE_UNION |
| 1206 | || TYPE_CODE (arg_type) == TYPE_CODE_ARRAY |
| 1207 | || TYPE_CODE (arg_type) == TYPE_CODE_STRING |
| 1208 | || TYPE_CODE (arg_type) == TYPE_CODE_BITSTRING |
| 1209 | || TYPE_CODE (arg_type) == TYPE_CODE_SET |
| 1210 | || (TYPE_CODE (arg_type) == TYPE_CODE_FLT |
| 1211 | && TYPE_LENGTH (arg_type) > 8) |
| 1212 | ) |
| 1213 | && REG_STRUCT_HAS_ADDR (using_gcc, arg_type)) |
| 1214 | { |
| 1215 | CORE_ADDR addr; |
| 1216 | int len = TYPE_LENGTH (arg_type); |
| 1217 | #ifdef STACK_ALIGN |
| 1218 | /* MVS 11/22/96: I think at least some of this stack_align code is |
| 1219 | really broken. Better to let PUSH_ARGUMENTS adjust the stack in |
| 1220 | a target-defined manner. */ |
| 1221 | int aligned_len = STACK_ALIGN (len); |
| 1222 | #else |
| 1223 | int aligned_len = len; |
| 1224 | #endif |
| 1225 | #if !(1 INNER_THAN 2) |
| 1226 | /* The stack grows up, so the address of the thing we push |
| 1227 | is the stack pointer before we push it. */ |
| 1228 | addr = sp; |
| 1229 | #else |
| 1230 | sp -= aligned_len; |
| 1231 | #endif |
| 1232 | /* Push the structure. */ |
| 1233 | write_memory (sp, VALUE_CONTENTS (args[i]), len); |
| 1234 | #if 1 INNER_THAN 2 |
| 1235 | /* The stack grows down, so the address of the thing we push |
| 1236 | is the stack pointer after we push it. */ |
| 1237 | addr = sp; |
| 1238 | #else |
| 1239 | sp += aligned_len; |
| 1240 | #endif |
| 1241 | /* The value we're going to pass is the address of the thing |
| 1242 | we just pushed. */ |
| 1243 | args[i] = value_from_longest (lookup_pointer_type (value_type), |
| 1244 | (LONGEST) addr); |
| 1245 | } |
| 1246 | } |
| 1247 | } |
| 1248 | #endif /* REG_STRUCT_HAS_ADDR. */ |
| 1249 | |
| 1250 | /* Reserve space for the return structure to be written on the |
| 1251 | stack, if necessary */ |
| 1252 | |
| 1253 | if (struct_return) |
| 1254 | { |
| 1255 | int len = TYPE_LENGTH (value_type); |
| 1256 | #ifdef STACK_ALIGN |
| 1257 | /* MVS 11/22/96: I think at least some of this stack_align code is |
| 1258 | really broken. Better to let PUSH_ARGUMENTS adjust the stack in |
| 1259 | a target-defined manner. */ |
| 1260 | len = STACK_ALIGN (len); |
| 1261 | #endif |
| 1262 | #if 1 INNER_THAN 2 |
| 1263 | sp -= len; |
| 1264 | struct_addr = sp; |
| 1265 | #else |
| 1266 | struct_addr = sp; |
| 1267 | sp += len; |
| 1268 | #endif |
| 1269 | } |
| 1270 | |
| 1271 | #if defined(STACK_ALIGN) && (1 INNER_THAN 2) |
| 1272 | /* MVS 11/22/96: I think at least some of this stack_align code is |
| 1273 | really broken. Better to let PUSH_ARGUMENTS adjust the stack in |
| 1274 | a target-defined manner. */ |
| 1275 | { |
| 1276 | /* If stack grows down, we must leave a hole at the top. */ |
| 1277 | int len = 0; |
| 1278 | |
| 1279 | for (i = nargs - 1; i >= 0; i--) |
| 1280 | len += TYPE_LENGTH (VALUE_TYPE (args[i])); |
| 1281 | #ifdef CALL_DUMMY_STACK_ADJUST |
| 1282 | len += CALL_DUMMY_STACK_ADJUST; |
| 1283 | #endif |
| 1284 | sp -= STACK_ALIGN (len) - len; |
| 1285 | } |
| 1286 | #endif /* STACK_ALIGN */ |
| 1287 | |
| 1288 | #ifdef PUSH_ARGUMENTS |
| 1289 | PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr); |
| 1290 | #else /* !PUSH_ARGUMENTS */ |
| 1291 | for (i = nargs - 1; i >= 0; i--) |
| 1292 | sp = value_push (sp, args[i]); |
| 1293 | #endif /* !PUSH_ARGUMENTS */ |
| 1294 | |
| 1295 | #ifdef PUSH_RETURN_ADDRESS /* for targets that use no CALL_DUMMY */ |
| 1296 | /* There are a number of targets now which actually don't write any |
| 1297 | CALL_DUMMY instructions into the target, but instead just save the |
| 1298 | machine state, push the arguments, and jump directly to the callee |
| 1299 | function. Since this doesn't actually involve executing a JSR/BSR |
| 1300 | instruction, the return address must be set up by hand, either by |
| 1301 | pushing onto the stack or copying into a return-address register |
| 1302 | as appropriate. Formerly this has been done in PUSH_ARGUMENTS, |
| 1303 | but that's overloading its functionality a bit, so I'm making it |
| 1304 | explicit to do it here. */ |
| 1305 | sp = PUSH_RETURN_ADDRESS(real_pc, sp); |
| 1306 | #endif /* PUSH_RETURN_ADDRESS */ |
| 1307 | |
| 1308 | #if defined(STACK_ALIGN) && !(1 INNER_THAN 2) |
| 1309 | { |
| 1310 | /* If stack grows up, we must leave a hole at the bottom, note |
| 1311 | that sp already has been advanced for the arguments! */ |
| 1312 | #ifdef CALL_DUMMY_STACK_ADJUST |
| 1313 | sp += CALL_DUMMY_STACK_ADJUST; |
| 1314 | #endif |
| 1315 | sp = STACK_ALIGN (sp); |
| 1316 | } |
| 1317 | #endif /* STACK_ALIGN */ |
| 1318 | |
| 1319 | /* XXX This seems wrong. For stacks that grow down we shouldn't do |
| 1320 | anything here! */ |
| 1321 | /* MVS 11/22/96: I think at least some of this stack_align code is |
| 1322 | really broken. Better to let PUSH_ARGUMENTS adjust the stack in |
| 1323 | a target-defined manner. */ |
| 1324 | #ifdef CALL_DUMMY_STACK_ADJUST |
| 1325 | #if 1 INNER_THAN 2 |
| 1326 | sp -= CALL_DUMMY_STACK_ADJUST; |
| 1327 | #endif |
| 1328 | #endif /* CALL_DUMMY_STACK_ADJUST */ |
| 1329 | |
| 1330 | /* Store the address at which the structure is supposed to be |
| 1331 | written. Note that this (and the code which reserved the space |
| 1332 | above) assumes that gcc was used to compile this function. Since |
| 1333 | it doesn't cost us anything but space and if the function is pcc |
| 1334 | it will ignore this value, we will make that assumption. |
| 1335 | |
| 1336 | Also note that on some machines (like the sparc) pcc uses a |
| 1337 | convention like gcc's. */ |
| 1338 | |
| 1339 | if (struct_return) |
| 1340 | STORE_STRUCT_RETURN (struct_addr, sp); |
| 1341 | |
| 1342 | /* Write the stack pointer. This is here because the statements above |
| 1343 | might fool with it. On SPARC, this write also stores the register |
| 1344 | window into the right place in the new stack frame, which otherwise |
| 1345 | wouldn't happen. (See store_inferior_registers in sparc-nat.c.) */ |
| 1346 | write_sp (sp); |
| 1347 | |
| 1348 | { |
| 1349 | char retbuf[REGISTER_BYTES]; |
| 1350 | char *name; |
| 1351 | struct symbol *symbol; |
| 1352 | |
| 1353 | name = NULL; |
| 1354 | symbol = find_pc_function (funaddr); |
| 1355 | if (symbol) |
| 1356 | { |
| 1357 | name = SYMBOL_SOURCE_NAME (symbol); |
| 1358 | } |
| 1359 | else |
| 1360 | { |
| 1361 | /* Try the minimal symbols. */ |
| 1362 | struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (funaddr); |
| 1363 | |
| 1364 | if (msymbol) |
| 1365 | { |
| 1366 | name = SYMBOL_SOURCE_NAME (msymbol); |
| 1367 | } |
| 1368 | } |
| 1369 | if (name == NULL) |
| 1370 | { |
| 1371 | char format[80]; |
| 1372 | sprintf (format, "at %s", local_hex_format ()); |
| 1373 | name = alloca (80); |
| 1374 | /* FIXME-32x64: assumes funaddr fits in a long. */ |
| 1375 | sprintf (name, format, (unsigned long) funaddr); |
| 1376 | } |
| 1377 | |
| 1378 | /* Execute the stack dummy routine, calling FUNCTION. |
| 1379 | When it is done, discard the empty frame |
| 1380 | after storing the contents of all regs into retbuf. */ |
| 1381 | if (run_stack_dummy (real_pc + CALL_DUMMY_START_OFFSET, retbuf)) |
| 1382 | { |
| 1383 | /* We stopped somewhere besides the call dummy. */ |
| 1384 | |
| 1385 | /* If we did the cleanups, we would print a spurious error message |
| 1386 | (Unable to restore previously selected frame), would write the |
| 1387 | registers from the inf_status (which is wrong), and would do other |
| 1388 | wrong things (like set stop_bpstat to the wrong thing). */ |
| 1389 | discard_cleanups (old_chain); |
| 1390 | /* Prevent memory leak. */ |
| 1391 | bpstat_clear (&inf_status.stop_bpstat); |
| 1392 | |
| 1393 | /* The following error message used to say "The expression |
| 1394 | which contained the function call has been discarded." It |
| 1395 | is a hard concept to explain in a few words. Ideally, GDB |
| 1396 | would be able to resume evaluation of the expression when |
| 1397 | the function finally is done executing. Perhaps someday |
| 1398 | this will be implemented (it would not be easy). */ |
| 1399 | |
| 1400 | /* FIXME: Insert a bunch of wrap_here; name can be very long if it's |
| 1401 | a C++ name with arguments and stuff. */ |
| 1402 | error ("\ |
| 1403 | The program being debugged stopped while in a function called from GDB.\n\ |
| 1404 | When the function (%s) is done executing, GDB will silently\n\ |
| 1405 | stop (instead of continuing to evaluate the expression containing\n\ |
| 1406 | the function call).", name); |
| 1407 | } |
| 1408 | |
| 1409 | do_cleanups (old_chain); |
| 1410 | |
| 1411 | /* Figure out the value returned by the function. */ |
| 1412 | return value_being_returned (value_type, retbuf, struct_return); |
| 1413 | } |
| 1414 | } |
| 1415 | #else /* no CALL_DUMMY. */ |
| 1416 | value_ptr |
| 1417 | call_function_by_hand (function, nargs, args) |
| 1418 | value_ptr function; |
| 1419 | int nargs; |
| 1420 | value_ptr *args; |
| 1421 | { |
| 1422 | error ("Cannot invoke functions on this machine."); |
| 1423 | } |
| 1424 | #endif /* no CALL_DUMMY. */ |
| 1425 | |
| 1426 | \f |
| 1427 | /* Create a value for an array by allocating space in the inferior, copying |
| 1428 | the data into that space, and then setting up an array value. |
| 1429 | |
| 1430 | The array bounds are set from LOWBOUND and HIGHBOUND, and the array is |
| 1431 | populated from the values passed in ELEMVEC. |
| 1432 | |
| 1433 | The element type of the array is inherited from the type of the |
| 1434 | first element, and all elements must have the same size (though we |
| 1435 | don't currently enforce any restriction on their types). */ |
| 1436 | |
| 1437 | value_ptr |
| 1438 | value_array (lowbound, highbound, elemvec) |
| 1439 | int lowbound; |
| 1440 | int highbound; |
| 1441 | value_ptr *elemvec; |
| 1442 | { |
| 1443 | int nelem; |
| 1444 | int idx; |
| 1445 | unsigned int typelength; |
| 1446 | value_ptr val; |
| 1447 | struct type *rangetype; |
| 1448 | struct type *arraytype; |
| 1449 | CORE_ADDR addr; |
| 1450 | |
| 1451 | /* Validate that the bounds are reasonable and that each of the elements |
| 1452 | have the same size. */ |
| 1453 | |
| 1454 | nelem = highbound - lowbound + 1; |
| 1455 | if (nelem <= 0) |
| 1456 | { |
| 1457 | error ("bad array bounds (%d, %d)", lowbound, highbound); |
| 1458 | } |
| 1459 | typelength = TYPE_LENGTH (VALUE_TYPE (elemvec[0])); |
| 1460 | for (idx = 1; idx < nelem; idx++) |
| 1461 | { |
| 1462 | if (TYPE_LENGTH (VALUE_TYPE (elemvec[idx])) != typelength) |
| 1463 | { |
| 1464 | error ("array elements must all be the same size"); |
| 1465 | } |
| 1466 | } |
| 1467 | |
| 1468 | rangetype = create_range_type ((struct type *) NULL, builtin_type_int, |
| 1469 | lowbound, highbound); |
| 1470 | arraytype = create_array_type ((struct type *) NULL, |
| 1471 | VALUE_TYPE (elemvec[0]), rangetype); |
| 1472 | |
| 1473 | if (!current_language->c_style_arrays) |
| 1474 | { |
| 1475 | val = allocate_value (arraytype); |
| 1476 | for (idx = 0; idx < nelem; idx++) |
| 1477 | { |
| 1478 | memcpy (VALUE_CONTENTS_RAW (val) + (idx * typelength), |
| 1479 | VALUE_CONTENTS (elemvec[idx]), |
| 1480 | typelength); |
| 1481 | } |
| 1482 | VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (elemvec[0]); |
| 1483 | return val; |
| 1484 | } |
| 1485 | |
| 1486 | /* Allocate space to store the array in the inferior, and then initialize |
| 1487 | it by copying in each element. FIXME: Is it worth it to create a |
| 1488 | local buffer in which to collect each value and then write all the |
| 1489 | bytes in one operation? */ |
| 1490 | |
| 1491 | addr = allocate_space_in_inferior (nelem * typelength); |
| 1492 | for (idx = 0; idx < nelem; idx++) |
| 1493 | { |
| 1494 | write_memory (addr + (idx * typelength), VALUE_CONTENTS (elemvec[idx]), |
| 1495 | typelength); |
| 1496 | } |
| 1497 | |
| 1498 | /* Create the array type and set up an array value to be evaluated lazily. */ |
| 1499 | |
| 1500 | val = value_at_lazy (arraytype, addr, VALUE_BFD_SECTION (elemvec[0])); |
| 1501 | return (val); |
| 1502 | } |
| 1503 | |
| 1504 | /* Create a value for a string constant by allocating space in the inferior, |
| 1505 | copying the data into that space, and returning the address with type |
| 1506 | TYPE_CODE_STRING. PTR points to the string constant data; LEN is number |
| 1507 | of characters. |
| 1508 | Note that string types are like array of char types with a lower bound of |
| 1509 | zero and an upper bound of LEN - 1. Also note that the string may contain |
| 1510 | embedded null bytes. */ |
| 1511 | |
| 1512 | value_ptr |
| 1513 | value_string (ptr, len) |
| 1514 | char *ptr; |
| 1515 | int len; |
| 1516 | { |
| 1517 | value_ptr val; |
| 1518 | int lowbound = current_language->string_lower_bound; |
| 1519 | struct type *rangetype = create_range_type ((struct type *) NULL, |
| 1520 | builtin_type_int, |
| 1521 | lowbound, len + lowbound - 1); |
| 1522 | struct type *stringtype |
| 1523 | = create_string_type ((struct type *) NULL, rangetype); |
| 1524 | CORE_ADDR addr; |
| 1525 | |
| 1526 | if (current_language->c_style_arrays == 0) |
| 1527 | { |
| 1528 | val = allocate_value (stringtype); |
| 1529 | memcpy (VALUE_CONTENTS_RAW (val), ptr, len); |
| 1530 | return val; |
| 1531 | } |
| 1532 | |
| 1533 | |
| 1534 | /* Allocate space to store the string in the inferior, and then |
| 1535 | copy LEN bytes from PTR in gdb to that address in the inferior. */ |
| 1536 | |
| 1537 | addr = allocate_space_in_inferior (len); |
| 1538 | write_memory (addr, ptr, len); |
| 1539 | |
| 1540 | val = value_at_lazy (stringtype, addr, NULL); |
| 1541 | return (val); |
| 1542 | } |
| 1543 | |
| 1544 | value_ptr |
| 1545 | value_bitstring (ptr, len) |
| 1546 | char *ptr; |
| 1547 | int len; |
| 1548 | { |
| 1549 | value_ptr val; |
| 1550 | struct type *domain_type = create_range_type (NULL, builtin_type_int, |
| 1551 | 0, len - 1); |
| 1552 | struct type *type = create_set_type ((struct type*) NULL, domain_type); |
| 1553 | TYPE_CODE (type) = TYPE_CODE_BITSTRING; |
| 1554 | val = allocate_value (type); |
| 1555 | memcpy (VALUE_CONTENTS_RAW (val), ptr, TYPE_LENGTH (type)); |
| 1556 | return val; |
| 1557 | } |
| 1558 | \f |
| 1559 | /* See if we can pass arguments in T2 to a function which takes arguments |
| 1560 | of types T1. Both t1 and t2 are NULL-terminated vectors. If some |
| 1561 | arguments need coercion of some sort, then the coerced values are written |
| 1562 | into T2. Return value is 0 if the arguments could be matched, or the |
| 1563 | position at which they differ if not. |
| 1564 | |
| 1565 | STATICP is nonzero if the T1 argument list came from a |
| 1566 | static member function. |
| 1567 | |
| 1568 | For non-static member functions, we ignore the first argument, |
| 1569 | which is the type of the instance variable. This is because we want |
| 1570 | to handle calls with objects from derived classes. This is not |
| 1571 | entirely correct: we should actually check to make sure that a |
| 1572 | requested operation is type secure, shouldn't we? FIXME. */ |
| 1573 | |
| 1574 | static int |
| 1575 | typecmp (staticp, t1, t2) |
| 1576 | int staticp; |
| 1577 | struct type *t1[]; |
| 1578 | value_ptr t2[]; |
| 1579 | { |
| 1580 | int i; |
| 1581 | |
| 1582 | if (t2 == 0) |
| 1583 | return 1; |
| 1584 | if (staticp && t1 == 0) |
| 1585 | return t2[1] != 0; |
| 1586 | if (t1 == 0) |
| 1587 | return 1; |
| 1588 | if (TYPE_CODE (t1[0]) == TYPE_CODE_VOID) return 0; |
| 1589 | if (t1[!staticp] == 0) return 0; |
| 1590 | for (i = !staticp; t1[i] && TYPE_CODE (t1[i]) != TYPE_CODE_VOID; i++) |
| 1591 | { |
| 1592 | struct type *tt1, *tt2; |
| 1593 | if (! t2[i]) |
| 1594 | return i+1; |
| 1595 | tt1 = check_typedef (t1[i]); |
| 1596 | tt2 = check_typedef (VALUE_TYPE(t2[i])); |
| 1597 | if (TYPE_CODE (tt1) == TYPE_CODE_REF |
| 1598 | /* We should be doing hairy argument matching, as below. */ |
| 1599 | && (TYPE_CODE (check_typedef (TYPE_TARGET_TYPE (tt1))) == TYPE_CODE (tt2))) |
| 1600 | { |
| 1601 | if (TYPE_CODE (tt2) == TYPE_CODE_ARRAY) |
| 1602 | t2[i] = value_coerce_array (t2[i]); |
| 1603 | else |
| 1604 | t2[i] = value_addr (t2[i]); |
| 1605 | continue; |
| 1606 | } |
| 1607 | |
| 1608 | while (TYPE_CODE (tt1) == TYPE_CODE_PTR |
| 1609 | && ( TYPE_CODE (tt2) == TYPE_CODE_ARRAY |
| 1610 | || TYPE_CODE (tt2) == TYPE_CODE_PTR)) |
| 1611 | { |
| 1612 | tt1 = check_typedef (TYPE_TARGET_TYPE(tt1)); |
| 1613 | tt2 = check_typedef (TYPE_TARGET_TYPE(tt2)); |
| 1614 | } |
| 1615 | if (TYPE_CODE(tt1) == TYPE_CODE(tt2)) continue; |
| 1616 | /* Array to pointer is a `trivial conversion' according to the ARM. */ |
| 1617 | |
| 1618 | /* We should be doing much hairier argument matching (see section 13.2 |
| 1619 | of the ARM), but as a quick kludge, just check for the same type |
| 1620 | code. */ |
| 1621 | if (TYPE_CODE (t1[i]) != TYPE_CODE (VALUE_TYPE (t2[i]))) |
| 1622 | return i+1; |
| 1623 | } |
| 1624 | if (!t1[i]) return 0; |
| 1625 | return t2[i] ? i+1 : 0; |
| 1626 | } |
| 1627 | |
| 1628 | /* Helper function used by value_struct_elt to recurse through baseclasses. |
| 1629 | Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes, |
| 1630 | and search in it assuming it has (class) type TYPE. |
| 1631 | If found, return value, else return NULL. |
| 1632 | |
| 1633 | If LOOKING_FOR_BASECLASS, then instead of looking for struct fields, |
| 1634 | look for a baseclass named NAME. */ |
| 1635 | |
| 1636 | static value_ptr |
| 1637 | search_struct_field (name, arg1, offset, type, looking_for_baseclass) |
| 1638 | char *name; |
| 1639 | register value_ptr arg1; |
| 1640 | int offset; |
| 1641 | register struct type *type; |
| 1642 | int looking_for_baseclass; |
| 1643 | { |
| 1644 | int i; |
| 1645 | |
| 1646 | CHECK_TYPEDEF (type); |
| 1647 | |
| 1648 | if (! looking_for_baseclass) |
| 1649 | for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--) |
| 1650 | { |
| 1651 | char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 1652 | |
| 1653 | if (t_field_name && STREQ (t_field_name, name)) |
| 1654 | { |
| 1655 | value_ptr v; |
| 1656 | if (TYPE_FIELD_STATIC (type, i)) |
| 1657 | { |
| 1658 | char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, i); |
| 1659 | struct symbol *sym = |
| 1660 | lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL); |
| 1661 | if (sym == NULL) |
| 1662 | error ("Internal error: could not find physical static variable named %s", |
| 1663 | phys_name); |
| 1664 | v = value_at (TYPE_FIELD_TYPE (type, i), |
| 1665 | SYMBOL_VALUE_ADDRESS (sym), SYMBOL_BFD_SECTION (sym)); |
| 1666 | } |
| 1667 | else |
| 1668 | v = value_primitive_field (arg1, offset, i, type); |
| 1669 | if (v == 0) |
| 1670 | error("there is no field named %s", name); |
| 1671 | return v; |
| 1672 | } |
| 1673 | |
| 1674 | if (t_field_name |
| 1675 | && (t_field_name[0] == '\0' |
| 1676 | || (TYPE_CODE (type) == TYPE_CODE_UNION |
| 1677 | && STREQ (t_field_name, "else")))) |
| 1678 | { |
| 1679 | struct type *field_type = TYPE_FIELD_TYPE (type, i); |
| 1680 | if (TYPE_CODE (field_type) == TYPE_CODE_UNION |
| 1681 | || TYPE_CODE (field_type) == TYPE_CODE_STRUCT) |
| 1682 | { |
| 1683 | /* Look for a match through the fields of an anonymous union, |
| 1684 | or anonymous struct. C++ provides anonymous unions. |
| 1685 | |
| 1686 | In the GNU Chill implementation of variant record types, |
| 1687 | each <alternative field> has an (anonymous) union type, |
| 1688 | each member of the union represents a <variant alternative>. |
| 1689 | Each <variant alternative> is represented as a struct, |
| 1690 | with a member for each <variant field>. */ |
| 1691 | |
| 1692 | value_ptr v; |
| 1693 | int new_offset = offset; |
| 1694 | |
| 1695 | /* This is pretty gross. In G++, the offset in an anonymous |
| 1696 | union is relative to the beginning of the enclosing struct. |
| 1697 | In the GNU Chill implementation of variant records, |
| 1698 | the bitpos is zero in an anonymous union field, so we |
| 1699 | have to add the offset of the union here. */ |
| 1700 | if (TYPE_CODE (field_type) == TYPE_CODE_STRUCT |
| 1701 | || (TYPE_NFIELDS (field_type) > 0 |
| 1702 | && TYPE_FIELD_BITPOS (field_type, 0) == 0)) |
| 1703 | new_offset += TYPE_FIELD_BITPOS (type, i) / 8; |
| 1704 | |
| 1705 | v = search_struct_field (name, arg1, new_offset, field_type, |
| 1706 | looking_for_baseclass); |
| 1707 | if (v) |
| 1708 | return v; |
| 1709 | } |
| 1710 | } |
| 1711 | } |
| 1712 | |
| 1713 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 1714 | { |
| 1715 | value_ptr v; |
| 1716 | struct type *basetype = check_typedef (TYPE_BASECLASS (type, i)); |
| 1717 | /* If we are looking for baseclasses, this is what we get when we |
| 1718 | hit them. But it could happen that the base part's member name |
| 1719 | is not yet filled in. */ |
| 1720 | int found_baseclass = (looking_for_baseclass |
| 1721 | && TYPE_BASECLASS_NAME (type, i) != NULL |
| 1722 | && STREQ (name, TYPE_BASECLASS_NAME (type, i))); |
| 1723 | |
| 1724 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 1725 | { |
| 1726 | int boffset = VALUE_OFFSET (arg1) + offset; |
| 1727 | boffset = baseclass_offset (type, i, |
| 1728 | VALUE_CONTENTS (arg1) + boffset, |
| 1729 | VALUE_ADDRESS (arg1) + boffset); |
| 1730 | if (boffset == -1) |
| 1731 | error ("virtual baseclass botch"); |
| 1732 | if (found_baseclass) |
| 1733 | { |
| 1734 | value_ptr v2 = allocate_value (basetype); |
| 1735 | VALUE_LVAL (v2) = VALUE_LVAL (arg1); |
| 1736 | VALUE_ADDRESS (v2) = VALUE_ADDRESS (arg1); |
| 1737 | VALUE_OFFSET (v2) = VALUE_OFFSET (arg1) + offset + boffset; |
| 1738 | if (VALUE_LAZY (arg1)) |
| 1739 | VALUE_LAZY (v2) = 1; |
| 1740 | else |
| 1741 | memcpy (VALUE_CONTENTS_RAW (v2), |
| 1742 | VALUE_CONTENTS_RAW (arg1) + offset + boffset, |
| 1743 | TYPE_LENGTH (basetype)); |
| 1744 | return v2; |
| 1745 | } |
| 1746 | v = search_struct_field (name, arg1, offset + boffset, |
| 1747 | TYPE_BASECLASS (type, i), |
| 1748 | looking_for_baseclass); |
| 1749 | } |
| 1750 | else if (found_baseclass) |
| 1751 | v = value_primitive_field (arg1, offset, i, type); |
| 1752 | else |
| 1753 | v = search_struct_field (name, arg1, |
| 1754 | offset + TYPE_BASECLASS_BITPOS (type, i) / 8, |
| 1755 | basetype, looking_for_baseclass); |
| 1756 | if (v) return v; |
| 1757 | } |
| 1758 | return NULL; |
| 1759 | } |
| 1760 | |
| 1761 | /* Helper function used by value_struct_elt to recurse through baseclasses. |
| 1762 | Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes, |
| 1763 | and search in it assuming it has (class) type TYPE. |
| 1764 | If found, return value, else if name matched and args not return (value)-1, |
| 1765 | else return NULL. */ |
| 1766 | |
| 1767 | static value_ptr |
| 1768 | search_struct_method (name, arg1p, args, offset, static_memfuncp, type) |
| 1769 | char *name; |
| 1770 | register value_ptr *arg1p, *args; |
| 1771 | int offset, *static_memfuncp; |
| 1772 | register struct type *type; |
| 1773 | { |
| 1774 | int i; |
| 1775 | value_ptr v; |
| 1776 | int name_matched = 0; |
| 1777 | char dem_opname[64]; |
| 1778 | |
| 1779 | CHECK_TYPEDEF (type); |
| 1780 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--) |
| 1781 | { |
| 1782 | char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i); |
| 1783 | /* FIXME! May need to check for ARM demangling here */ |
| 1784 | if (strncmp(t_field_name, "__", 2)==0 || |
| 1785 | strncmp(t_field_name, "op", 2)==0 || |
| 1786 | strncmp(t_field_name, "type", 4)==0 ) |
| 1787 | { |
| 1788 | if (cplus_demangle_opname(t_field_name, dem_opname, DMGL_ANSI)) |
| 1789 | t_field_name = dem_opname; |
| 1790 | else if (cplus_demangle_opname(t_field_name, dem_opname, 0)) |
| 1791 | t_field_name = dem_opname; |
| 1792 | } |
| 1793 | if (t_field_name && STREQ (t_field_name, name)) |
| 1794 | { |
| 1795 | int j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1; |
| 1796 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i); |
| 1797 | name_matched = 1; |
| 1798 | |
| 1799 | if (j > 0 && args == 0) |
| 1800 | error ("cannot resolve overloaded method `%s'", name); |
| 1801 | while (j >= 0) |
| 1802 | { |
| 1803 | if (TYPE_FN_FIELD_STUB (f, j)) |
| 1804 | check_stub_method (type, i, j); |
| 1805 | if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j), |
| 1806 | TYPE_FN_FIELD_ARGS (f, j), args)) |
| 1807 | { |
| 1808 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) |
| 1809 | return value_virtual_fn_field (arg1p, f, j, type, offset); |
| 1810 | if (TYPE_FN_FIELD_STATIC_P (f, j) && static_memfuncp) |
| 1811 | *static_memfuncp = 1; |
| 1812 | v = value_fn_field (arg1p, f, j, type, offset); |
| 1813 | if (v != NULL) return v; |
| 1814 | } |
| 1815 | j--; |
| 1816 | } |
| 1817 | } |
| 1818 | } |
| 1819 | |
| 1820 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 1821 | { |
| 1822 | int base_offset; |
| 1823 | |
| 1824 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 1825 | { |
| 1826 | base_offset = VALUE_OFFSET (*arg1p) + offset; |
| 1827 | base_offset = |
| 1828 | baseclass_offset (type, i, |
| 1829 | VALUE_CONTENTS (*arg1p) + base_offset, |
| 1830 | VALUE_ADDRESS (*arg1p) + base_offset); |
| 1831 | if (base_offset == -1) |
| 1832 | error ("virtual baseclass botch"); |
| 1833 | } |
| 1834 | else |
| 1835 | { |
| 1836 | base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8; |
| 1837 | } |
| 1838 | v = search_struct_method (name, arg1p, args, base_offset + offset, |
| 1839 | static_memfuncp, TYPE_BASECLASS (type, i)); |
| 1840 | if (v == (value_ptr) -1) |
| 1841 | { |
| 1842 | name_matched = 1; |
| 1843 | } |
| 1844 | else if (v) |
| 1845 | { |
| 1846 | /* FIXME-bothner: Why is this commented out? Why is it here? */ |
| 1847 | /* *arg1p = arg1_tmp;*/ |
| 1848 | return v; |
| 1849 | } |
| 1850 | } |
| 1851 | if (name_matched) return (value_ptr) -1; |
| 1852 | else return NULL; |
| 1853 | } |
| 1854 | |
| 1855 | /* Given *ARGP, a value of type (pointer to a)* structure/union, |
| 1856 | extract the component named NAME from the ultimate target structure/union |
| 1857 | and return it as a value with its appropriate type. |
| 1858 | ERR is used in the error message if *ARGP's type is wrong. |
| 1859 | |
| 1860 | C++: ARGS is a list of argument types to aid in the selection of |
| 1861 | an appropriate method. Also, handle derived types. |
| 1862 | |
| 1863 | STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location |
| 1864 | where the truthvalue of whether the function that was resolved was |
| 1865 | a static member function or not is stored. |
| 1866 | |
| 1867 | ERR is an error message to be printed in case the field is not found. */ |
| 1868 | |
| 1869 | value_ptr |
| 1870 | value_struct_elt (argp, args, name, static_memfuncp, err) |
| 1871 | register value_ptr *argp, *args; |
| 1872 | char *name; |
| 1873 | int *static_memfuncp; |
| 1874 | char *err; |
| 1875 | { |
| 1876 | register struct type *t; |
| 1877 | value_ptr v; |
| 1878 | |
| 1879 | COERCE_ARRAY (*argp); |
| 1880 | |
| 1881 | t = check_typedef (VALUE_TYPE (*argp)); |
| 1882 | |
| 1883 | /* Follow pointers until we get to a non-pointer. */ |
| 1884 | |
| 1885 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF) |
| 1886 | { |
| 1887 | *argp = value_ind (*argp); |
| 1888 | /* Don't coerce fn pointer to fn and then back again! */ |
| 1889 | if (TYPE_CODE (VALUE_TYPE (*argp)) != TYPE_CODE_FUNC) |
| 1890 | COERCE_ARRAY (*argp); |
| 1891 | t = check_typedef (VALUE_TYPE (*argp)); |
| 1892 | } |
| 1893 | |
| 1894 | if (TYPE_CODE (t) == TYPE_CODE_MEMBER) |
| 1895 | error ("not implemented: member type in value_struct_elt"); |
| 1896 | |
| 1897 | if ( TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 1898 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 1899 | error ("Attempt to extract a component of a value that is not a %s.", err); |
| 1900 | |
| 1901 | /* Assume it's not, unless we see that it is. */ |
| 1902 | if (static_memfuncp) |
| 1903 | *static_memfuncp =0; |
| 1904 | |
| 1905 | if (!args) |
| 1906 | { |
| 1907 | /* if there are no arguments ...do this... */ |
| 1908 | |
| 1909 | /* Try as a field first, because if we succeed, there |
| 1910 | is less work to be done. */ |
| 1911 | v = search_struct_field (name, *argp, 0, t, 0); |
| 1912 | if (v) |
| 1913 | return v; |
| 1914 | |
| 1915 | /* C++: If it was not found as a data field, then try to |
| 1916 | return it as a pointer to a method. */ |
| 1917 | |
| 1918 | if (destructor_name_p (name, t)) |
| 1919 | error ("Cannot get value of destructor"); |
| 1920 | |
| 1921 | v = search_struct_method (name, argp, args, 0, static_memfuncp, t); |
| 1922 | |
| 1923 | if (v == (value_ptr) -1) |
| 1924 | error ("Cannot take address of a method"); |
| 1925 | else if (v == 0) |
| 1926 | { |
| 1927 | if (TYPE_NFN_FIELDS (t)) |
| 1928 | error ("There is no member or method named %s.", name); |
| 1929 | else |
| 1930 | error ("There is no member named %s.", name); |
| 1931 | } |
| 1932 | return v; |
| 1933 | } |
| 1934 | |
| 1935 | if (destructor_name_p (name, t)) |
| 1936 | { |
| 1937 | if (!args[1]) |
| 1938 | { |
| 1939 | /* Destructors are a special case. */ |
| 1940 | int m_index, f_index; |
| 1941 | |
| 1942 | v = NULL; |
| 1943 | if (get_destructor_fn_field (t, &m_index, &f_index)) |
| 1944 | { |
| 1945 | v = value_fn_field (NULL, TYPE_FN_FIELDLIST1 (t, m_index), |
| 1946 | f_index, NULL, 0); |
| 1947 | } |
| 1948 | if (v == NULL) |
| 1949 | error ("could not find destructor function named %s.", name); |
| 1950 | else |
| 1951 | return v; |
| 1952 | } |
| 1953 | else |
| 1954 | { |
| 1955 | error ("destructor should not have any argument"); |
| 1956 | } |
| 1957 | } |
| 1958 | else |
| 1959 | v = search_struct_method (name, argp, args, 0, static_memfuncp, t); |
| 1960 | |
| 1961 | if (v == (value_ptr) -1) |
| 1962 | { |
| 1963 | error("Argument list of %s mismatch with component in the structure.", name); |
| 1964 | } |
| 1965 | else if (v == 0) |
| 1966 | { |
| 1967 | /* See if user tried to invoke data as function. If so, |
| 1968 | hand it back. If it's not callable (i.e., a pointer to function), |
| 1969 | gdb should give an error. */ |
| 1970 | v = search_struct_field (name, *argp, 0, t, 0); |
| 1971 | } |
| 1972 | |
| 1973 | if (!v) |
| 1974 | error ("Structure has no component named %s.", name); |
| 1975 | return v; |
| 1976 | } |
| 1977 | |
| 1978 | /* C++: return 1 is NAME is a legitimate name for the destructor |
| 1979 | of type TYPE. If TYPE does not have a destructor, or |
| 1980 | if NAME is inappropriate for TYPE, an error is signaled. */ |
| 1981 | int |
| 1982 | destructor_name_p (name, type) |
| 1983 | const char *name; |
| 1984 | const struct type *type; |
| 1985 | { |
| 1986 | /* destructors are a special case. */ |
| 1987 | |
| 1988 | if (name[0] == '~') |
| 1989 | { |
| 1990 | char *dname = type_name_no_tag (type); |
| 1991 | char *cp = strchr (dname, '<'); |
| 1992 | unsigned int len; |
| 1993 | |
| 1994 | /* Do not compare the template part for template classes. */ |
| 1995 | if (cp == NULL) |
| 1996 | len = strlen (dname); |
| 1997 | else |
| 1998 | len = cp - dname; |
| 1999 | if (strlen (name + 1) != len || !STREQN (dname, name + 1, len)) |
| 2000 | error ("name of destructor must equal name of class"); |
| 2001 | else |
| 2002 | return 1; |
| 2003 | } |
| 2004 | return 0; |
| 2005 | } |
| 2006 | |
| 2007 | /* Helper function for check_field: Given TYPE, a structure/union, |
| 2008 | return 1 if the component named NAME from the ultimate |
| 2009 | target structure/union is defined, otherwise, return 0. */ |
| 2010 | |
| 2011 | static int |
| 2012 | check_field_in (type, name) |
| 2013 | register struct type *type; |
| 2014 | const char *name; |
| 2015 | { |
| 2016 | register int i; |
| 2017 | |
| 2018 | for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--) |
| 2019 | { |
| 2020 | char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 2021 | if (t_field_name && STREQ (t_field_name, name)) |
| 2022 | return 1; |
| 2023 | } |
| 2024 | |
| 2025 | /* C++: If it was not found as a data field, then try to |
| 2026 | return it as a pointer to a method. */ |
| 2027 | |
| 2028 | /* Destructors are a special case. */ |
| 2029 | if (destructor_name_p (name, type)) |
| 2030 | { |
| 2031 | int m_index, f_index; |
| 2032 | |
| 2033 | return get_destructor_fn_field (type, &m_index, &f_index); |
| 2034 | } |
| 2035 | |
| 2036 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i) |
| 2037 | { |
| 2038 | if (STREQ (TYPE_FN_FIELDLIST_NAME (type, i), name)) |
| 2039 | return 1; |
| 2040 | } |
| 2041 | |
| 2042 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 2043 | if (check_field_in (TYPE_BASECLASS (type, i), name)) |
| 2044 | return 1; |
| 2045 | |
| 2046 | return 0; |
| 2047 | } |
| 2048 | |
| 2049 | |
| 2050 | /* C++: Given ARG1, a value of type (pointer to a)* structure/union, |
| 2051 | return 1 if the component named NAME from the ultimate |
| 2052 | target structure/union is defined, otherwise, return 0. */ |
| 2053 | |
| 2054 | int |
| 2055 | check_field (arg1, name) |
| 2056 | register value_ptr arg1; |
| 2057 | const char *name; |
| 2058 | { |
| 2059 | register struct type *t; |
| 2060 | |
| 2061 | COERCE_ARRAY (arg1); |
| 2062 | |
| 2063 | t = VALUE_TYPE (arg1); |
| 2064 | |
| 2065 | /* Follow pointers until we get to a non-pointer. */ |
| 2066 | |
| 2067 | for (;;) |
| 2068 | { |
| 2069 | CHECK_TYPEDEF (t); |
| 2070 | if (TYPE_CODE (t) != TYPE_CODE_PTR && TYPE_CODE (t) != TYPE_CODE_REF) |
| 2071 | break; |
| 2072 | t = TYPE_TARGET_TYPE (t); |
| 2073 | } |
| 2074 | |
| 2075 | if (TYPE_CODE (t) == TYPE_CODE_MEMBER) |
| 2076 | error ("not implemented: member type in check_field"); |
| 2077 | |
| 2078 | if ( TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 2079 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 2080 | error ("Internal error: `this' is not an aggregate"); |
| 2081 | |
| 2082 | return check_field_in (t, name); |
| 2083 | } |
| 2084 | |
| 2085 | /* C++: Given an aggregate type CURTYPE, and a member name NAME, |
| 2086 | return the address of this member as a "pointer to member" |
| 2087 | type. If INTYPE is non-null, then it will be the type |
| 2088 | of the member we are looking for. This will help us resolve |
| 2089 | "pointers to member functions". This function is used |
| 2090 | to resolve user expressions of the form "DOMAIN::NAME". */ |
| 2091 | |
| 2092 | value_ptr |
| 2093 | value_struct_elt_for_reference (domain, offset, curtype, name, intype) |
| 2094 | struct type *domain, *curtype, *intype; |
| 2095 | int offset; |
| 2096 | char *name; |
| 2097 | { |
| 2098 | register struct type *t = curtype; |
| 2099 | register int i; |
| 2100 | value_ptr v; |
| 2101 | |
| 2102 | if ( TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 2103 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 2104 | error ("Internal error: non-aggregate type to value_struct_elt_for_reference"); |
| 2105 | |
| 2106 | for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--) |
| 2107 | { |
| 2108 | char *t_field_name = TYPE_FIELD_NAME (t, i); |
| 2109 | |
| 2110 | if (t_field_name && STREQ (t_field_name, name)) |
| 2111 | { |
| 2112 | if (TYPE_FIELD_STATIC (t, i)) |
| 2113 | { |
| 2114 | char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (t, i); |
| 2115 | struct symbol *sym = |
| 2116 | lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL); |
| 2117 | if (sym == NULL) |
| 2118 | error ("Internal error: could not find physical static variable named %s", |
| 2119 | phys_name); |
| 2120 | return value_at (SYMBOL_TYPE (sym), |
| 2121 | SYMBOL_VALUE_ADDRESS (sym), |
| 2122 | SYMBOL_BFD_SECTION (sym)); |
| 2123 | } |
| 2124 | if (TYPE_FIELD_PACKED (t, i)) |
| 2125 | error ("pointers to bitfield members not allowed"); |
| 2126 | |
| 2127 | return value_from_longest |
| 2128 | (lookup_reference_type (lookup_member_type (TYPE_FIELD_TYPE (t, i), |
| 2129 | domain)), |
| 2130 | offset + (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3)); |
| 2131 | } |
| 2132 | } |
| 2133 | |
| 2134 | /* C++: If it was not found as a data field, then try to |
| 2135 | return it as a pointer to a method. */ |
| 2136 | |
| 2137 | /* Destructors are a special case. */ |
| 2138 | if (destructor_name_p (name, t)) |
| 2139 | { |
| 2140 | error ("member pointers to destructors not implemented yet"); |
| 2141 | } |
| 2142 | |
| 2143 | /* Perform all necessary dereferencing. */ |
| 2144 | while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR) |
| 2145 | intype = TYPE_TARGET_TYPE (intype); |
| 2146 | |
| 2147 | for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i) |
| 2148 | { |
| 2149 | char *t_field_name = TYPE_FN_FIELDLIST_NAME (t, i); |
| 2150 | char dem_opname[64]; |
| 2151 | |
| 2152 | if (strncmp(t_field_name, "__", 2)==0 || |
| 2153 | strncmp(t_field_name, "op", 2)==0 || |
| 2154 | strncmp(t_field_name, "type", 4)==0 ) |
| 2155 | { |
| 2156 | if (cplus_demangle_opname(t_field_name, dem_opname, DMGL_ANSI)) |
| 2157 | t_field_name = dem_opname; |
| 2158 | else if (cplus_demangle_opname(t_field_name, dem_opname, 0)) |
| 2159 | t_field_name = dem_opname; |
| 2160 | } |
| 2161 | if (t_field_name && STREQ (t_field_name, name)) |
| 2162 | { |
| 2163 | int j = TYPE_FN_FIELDLIST_LENGTH (t, i); |
| 2164 | struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i); |
| 2165 | |
| 2166 | if (intype == 0 && j > 1) |
| 2167 | error ("non-unique member `%s' requires type instantiation", name); |
| 2168 | if (intype) |
| 2169 | { |
| 2170 | while (j--) |
| 2171 | if (TYPE_FN_FIELD_TYPE (f, j) == intype) |
| 2172 | break; |
| 2173 | if (j < 0) |
| 2174 | error ("no member function matches that type instantiation"); |
| 2175 | } |
| 2176 | else |
| 2177 | j = 0; |
| 2178 | |
| 2179 | if (TYPE_FN_FIELD_STUB (f, j)) |
| 2180 | check_stub_method (t, i, j); |
| 2181 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) |
| 2182 | { |
| 2183 | return value_from_longest |
| 2184 | (lookup_reference_type |
| 2185 | (lookup_member_type (TYPE_FN_FIELD_TYPE (f, j), |
| 2186 | domain)), |
| 2187 | (LONGEST) METHOD_PTR_FROM_VOFFSET (TYPE_FN_FIELD_VOFFSET (f, j))); |
| 2188 | } |
| 2189 | else |
| 2190 | { |
| 2191 | struct symbol *s = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), |
| 2192 | 0, VAR_NAMESPACE, 0, NULL); |
| 2193 | if (s == NULL) |
| 2194 | { |
| 2195 | v = 0; |
| 2196 | } |
| 2197 | else |
| 2198 | { |
| 2199 | v = read_var_value (s, 0); |
| 2200 | #if 0 |
| 2201 | VALUE_TYPE (v) = lookup_reference_type |
| 2202 | (lookup_member_type (TYPE_FN_FIELD_TYPE (f, j), |
| 2203 | domain)); |
| 2204 | #endif |
| 2205 | } |
| 2206 | return v; |
| 2207 | } |
| 2208 | } |
| 2209 | } |
| 2210 | for (i = TYPE_N_BASECLASSES (t) - 1; i >= 0; i--) |
| 2211 | { |
| 2212 | value_ptr v; |
| 2213 | int base_offset; |
| 2214 | |
| 2215 | if (BASETYPE_VIA_VIRTUAL (t, i)) |
| 2216 | base_offset = 0; |
| 2217 | else |
| 2218 | base_offset = TYPE_BASECLASS_BITPOS (t, i) / 8; |
| 2219 | v = value_struct_elt_for_reference (domain, |
| 2220 | offset + base_offset, |
| 2221 | TYPE_BASECLASS (t, i), |
| 2222 | name, |
| 2223 | intype); |
| 2224 | if (v) |
| 2225 | return v; |
| 2226 | } |
| 2227 | return 0; |
| 2228 | } |
| 2229 | |
| 2230 | /* C++: return the value of the class instance variable, if one exists. |
| 2231 | Flag COMPLAIN signals an error if the request is made in an |
| 2232 | inappropriate context. */ |
| 2233 | |
| 2234 | value_ptr |
| 2235 | value_of_this (complain) |
| 2236 | int complain; |
| 2237 | { |
| 2238 | struct symbol *func, *sym; |
| 2239 | struct block *b; |
| 2240 | int i; |
| 2241 | static const char funny_this[] = "this"; |
| 2242 | value_ptr this; |
| 2243 | |
| 2244 | if (selected_frame == 0) |
| 2245 | if (complain) |
| 2246 | error ("no frame selected"); |
| 2247 | else return 0; |
| 2248 | |
| 2249 | func = get_frame_function (selected_frame); |
| 2250 | if (!func) |
| 2251 | { |
| 2252 | if (complain) |
| 2253 | error ("no `this' in nameless context"); |
| 2254 | else return 0; |
| 2255 | } |
| 2256 | |
| 2257 | b = SYMBOL_BLOCK_VALUE (func); |
| 2258 | i = BLOCK_NSYMS (b); |
| 2259 | if (i <= 0) |
| 2260 | if (complain) |
| 2261 | error ("no args, no `this'"); |
| 2262 | else return 0; |
| 2263 | |
| 2264 | /* Calling lookup_block_symbol is necessary to get the LOC_REGISTER |
| 2265 | symbol instead of the LOC_ARG one (if both exist). */ |
| 2266 | sym = lookup_block_symbol (b, funny_this, VAR_NAMESPACE); |
| 2267 | if (sym == NULL) |
| 2268 | { |
| 2269 | if (complain) |
| 2270 | error ("current stack frame not in method"); |
| 2271 | else |
| 2272 | return NULL; |
| 2273 | } |
| 2274 | |
| 2275 | this = read_var_value (sym, selected_frame); |
| 2276 | if (this == 0 && complain) |
| 2277 | error ("`this' argument at unknown address"); |
| 2278 | return this; |
| 2279 | } |
| 2280 | |
| 2281 | /* Create a slice (sub-string, sub-array) of ARRAY, that is LENGTH elements |
| 2282 | long, starting at LOWBOUND. The result has the same lower bound as |
| 2283 | the original ARRAY. */ |
| 2284 | |
| 2285 | value_ptr |
| 2286 | value_slice (array, lowbound, length) |
| 2287 | value_ptr array; |
| 2288 | int lowbound, length; |
| 2289 | { |
| 2290 | struct type *slice_range_type, *slice_type, *range_type; |
| 2291 | LONGEST lowerbound, upperbound, offset; |
| 2292 | value_ptr slice; |
| 2293 | struct type *array_type; |
| 2294 | array_type = check_typedef (VALUE_TYPE (array)); |
| 2295 | COERCE_VARYING_ARRAY (array, array_type); |
| 2296 | if (TYPE_CODE (array_type) != TYPE_CODE_ARRAY |
| 2297 | && TYPE_CODE (array_type) != TYPE_CODE_STRING |
| 2298 | && TYPE_CODE (array_type) != TYPE_CODE_BITSTRING) |
| 2299 | error ("cannot take slice of non-array"); |
| 2300 | range_type = TYPE_INDEX_TYPE (array_type); |
| 2301 | if (get_discrete_bounds (range_type, &lowerbound, &upperbound) < 0) |
| 2302 | error ("slice from bad array or bitstring"); |
| 2303 | if (lowbound < lowerbound || length < 0 |
| 2304 | || lowbound + length - 1 > upperbound |
| 2305 | /* Chill allows zero-length strings but not arrays. */ |
| 2306 | || (current_language->la_language == language_chill |
| 2307 | && length == 0 && TYPE_CODE (array_type) == TYPE_CODE_ARRAY)) |
| 2308 | error ("slice out of range"); |
| 2309 | /* FIXME-type-allocation: need a way to free this type when we are |
| 2310 | done with it. */ |
| 2311 | slice_range_type = create_range_type ((struct type*) NULL, |
| 2312 | TYPE_TARGET_TYPE (range_type), |
| 2313 | lowbound, lowbound + length - 1); |
| 2314 | if (TYPE_CODE (array_type) == TYPE_CODE_BITSTRING) |
| 2315 | { |
| 2316 | int i; |
| 2317 | slice_type = create_set_type ((struct type*) NULL, slice_range_type); |
| 2318 | TYPE_CODE (slice_type) = TYPE_CODE_BITSTRING; |
| 2319 | slice = value_zero (slice_type, not_lval); |
| 2320 | for (i = 0; i < length; i++) |
| 2321 | { |
| 2322 | int element = value_bit_index (array_type, |
| 2323 | VALUE_CONTENTS (array), |
| 2324 | lowbound + i); |
| 2325 | if (element < 0) |
| 2326 | error ("internal error accessing bitstring"); |
| 2327 | else if (element > 0) |
| 2328 | { |
| 2329 | int j = i % TARGET_CHAR_BIT; |
| 2330 | if (BITS_BIG_ENDIAN) |
| 2331 | j = TARGET_CHAR_BIT - 1 - j; |
| 2332 | VALUE_CONTENTS_RAW (slice)[i / TARGET_CHAR_BIT] |= (1 << j); |
| 2333 | } |
| 2334 | } |
| 2335 | /* We should set the address, bitssize, and bitspos, so the clice |
| 2336 | can be used on the LHS, but that may require extensions to |
| 2337 | value_assign. For now, just leave as a non_lval. FIXME. */ |
| 2338 | } |
| 2339 | else |
| 2340 | { |
| 2341 | struct type *element_type = TYPE_TARGET_TYPE (array_type); |
| 2342 | offset |
| 2343 | = (lowbound - lowerbound) * TYPE_LENGTH (check_typedef (element_type)); |
| 2344 | slice_type = create_array_type ((struct type*) NULL, element_type, |
| 2345 | slice_range_type); |
| 2346 | TYPE_CODE (slice_type) = TYPE_CODE (array_type); |
| 2347 | slice = allocate_value (slice_type); |
| 2348 | if (VALUE_LAZY (array)) |
| 2349 | VALUE_LAZY (slice) = 1; |
| 2350 | else |
| 2351 | memcpy (VALUE_CONTENTS (slice), VALUE_CONTENTS (array) + offset, |
| 2352 | TYPE_LENGTH (slice_type)); |
| 2353 | if (VALUE_LVAL (array) == lval_internalvar) |
| 2354 | VALUE_LVAL (slice) = lval_internalvar_component; |
| 2355 | else |
| 2356 | VALUE_LVAL (slice) = VALUE_LVAL (array); |
| 2357 | VALUE_ADDRESS (slice) = VALUE_ADDRESS (array); |
| 2358 | VALUE_OFFSET (slice) = VALUE_OFFSET (array) + offset; |
| 2359 | } |
| 2360 | return slice; |
| 2361 | } |
| 2362 | |
| 2363 | /* Assuming chill_varying_type (VARRAY) is true, return an equivalent |
| 2364 | value as a fixed-length array. */ |
| 2365 | |
| 2366 | value_ptr |
| 2367 | varying_to_slice (varray) |
| 2368 | value_ptr varray; |
| 2369 | { |
| 2370 | struct type *vtype = check_typedef (VALUE_TYPE (varray)); |
| 2371 | LONGEST length = unpack_long (TYPE_FIELD_TYPE (vtype, 0), |
| 2372 | VALUE_CONTENTS (varray) |
| 2373 | + TYPE_FIELD_BITPOS (vtype, 0) / 8); |
| 2374 | return value_slice (value_primitive_field (varray, 0, 1, vtype), 0, length); |
| 2375 | } |
| 2376 | |
| 2377 | /* Create a value for a FORTRAN complex number. Currently most of |
| 2378 | the time values are coerced to COMPLEX*16 (i.e. a complex number |
| 2379 | composed of 2 doubles. This really should be a smarter routine |
| 2380 | that figures out precision inteligently as opposed to assuming |
| 2381 | doubles. FIXME: fmb */ |
| 2382 | |
| 2383 | value_ptr |
| 2384 | value_literal_complex (arg1, arg2, type) |
| 2385 | value_ptr arg1; |
| 2386 | value_ptr arg2; |
| 2387 | struct type *type; |
| 2388 | { |
| 2389 | register value_ptr val; |
| 2390 | struct type *real_type = TYPE_TARGET_TYPE (type); |
| 2391 | |
| 2392 | val = allocate_value (type); |
| 2393 | arg1 = value_cast (real_type, arg1); |
| 2394 | arg2 = value_cast (real_type, arg2); |
| 2395 | |
| 2396 | memcpy (VALUE_CONTENTS_RAW (val), |
| 2397 | VALUE_CONTENTS (arg1), TYPE_LENGTH (real_type)); |
| 2398 | memcpy (VALUE_CONTENTS_RAW (val) + TYPE_LENGTH (real_type), |
| 2399 | VALUE_CONTENTS (arg2), TYPE_LENGTH (real_type)); |
| 2400 | return val; |
| 2401 | } |
| 2402 | |
| 2403 | /* Cast a value into the appropriate complex data type. */ |
| 2404 | |
| 2405 | static value_ptr |
| 2406 | cast_into_complex (type, val) |
| 2407 | struct type *type; |
| 2408 | register value_ptr val; |
| 2409 | { |
| 2410 | struct type *real_type = TYPE_TARGET_TYPE (type); |
| 2411 | if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_COMPLEX) |
| 2412 | { |
| 2413 | struct type *val_real_type = TYPE_TARGET_TYPE (VALUE_TYPE (val)); |
| 2414 | value_ptr re_val = allocate_value (val_real_type); |
| 2415 | value_ptr im_val = allocate_value (val_real_type); |
| 2416 | |
| 2417 | memcpy (VALUE_CONTENTS_RAW (re_val), |
| 2418 | VALUE_CONTENTS (val), TYPE_LENGTH (val_real_type)); |
| 2419 | memcpy (VALUE_CONTENTS_RAW (im_val), |
| 2420 | VALUE_CONTENTS (val) + TYPE_LENGTH (val_real_type), |
| 2421 | TYPE_LENGTH (val_real_type)); |
| 2422 | |
| 2423 | return value_literal_complex (re_val, im_val, type); |
| 2424 | } |
| 2425 | else if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FLT |
| 2426 | || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_INT) |
| 2427 | return value_literal_complex (val, value_zero (real_type, not_lval), type); |
| 2428 | else |
| 2429 | error ("cannot cast non-number to complex"); |
| 2430 | } |
| 2431 | |
| 2432 | void |
| 2433 | _initialize_valops () |
| 2434 | { |
| 2435 | #if 0 |
| 2436 | add_show_from_set |
| 2437 | (add_set_cmd ("abandon", class_support, var_boolean, (char *)&auto_abandon, |
| 2438 | "Set automatic abandonment of expressions upon failure.", |
| 2439 | &setlist), |
| 2440 | &showlist); |
| 2441 | #endif |
| 2442 | } |