| 1 | /* Perform non-arithmetic operations on values, for GDB. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "symtab.h" |
| 22 | #include "gdbtypes.h" |
| 23 | #include "value.h" |
| 24 | #include "frame.h" |
| 25 | #include "inferior.h" |
| 26 | #include "gdbcore.h" |
| 27 | #include "target.h" |
| 28 | #include "demangle.h" |
| 29 | |
| 30 | #include <errno.h> |
| 31 | |
| 32 | /* Local functions. */ |
| 33 | |
| 34 | static int |
| 35 | typecmp PARAMS ((int staticp, struct type *t1[], value t2[])); |
| 36 | |
| 37 | static CORE_ADDR |
| 38 | find_function_addr PARAMS ((value, struct type **)); |
| 39 | |
| 40 | static CORE_ADDR |
| 41 | value_push PARAMS ((CORE_ADDR, value)); |
| 42 | |
| 43 | static CORE_ADDR |
| 44 | value_arg_push PARAMS ((CORE_ADDR, value)); |
| 45 | |
| 46 | static value |
| 47 | search_struct_field PARAMS ((char *, value, int, struct type *, int)); |
| 48 | |
| 49 | static value |
| 50 | search_struct_method PARAMS ((char *, value *, value *, int, int *, |
| 51 | struct type *)); |
| 52 | |
| 53 | static int |
| 54 | check_field_in PARAMS ((struct type *, const char *)); |
| 55 | |
| 56 | static CORE_ADDR |
| 57 | allocate_space_in_inferior PARAMS ((int)); |
| 58 | |
| 59 | \f |
| 60 | /* Allocate NBYTES of space in the inferior using the inferior's malloc |
| 61 | and return a value that is a pointer to the allocated space. */ |
| 62 | |
| 63 | static CORE_ADDR |
| 64 | allocate_space_in_inferior (len) |
| 65 | int len; |
| 66 | { |
| 67 | register value val; |
| 68 | register struct symbol *sym; |
| 69 | struct minimal_symbol *msymbol; |
| 70 | struct type *type; |
| 71 | value blocklen; |
| 72 | LONGEST maddr; |
| 73 | |
| 74 | /* Find the address of malloc in the inferior. */ |
| 75 | |
| 76 | sym = lookup_symbol ("malloc", 0, VAR_NAMESPACE, 0, NULL); |
| 77 | if (sym != NULL) |
| 78 | { |
| 79 | if (SYMBOL_CLASS (sym) != LOC_BLOCK) |
| 80 | { |
| 81 | error ("\"malloc\" exists in this program but is not a function."); |
| 82 | } |
| 83 | val = value_of_variable (sym); |
| 84 | } |
| 85 | else |
| 86 | { |
| 87 | msymbol = lookup_minimal_symbol ("malloc", (struct objfile *) NULL); |
| 88 | if (msymbol != NULL) |
| 89 | { |
| 90 | type = lookup_pointer_type (builtin_type_char); |
| 91 | type = lookup_function_type (type); |
| 92 | type = lookup_pointer_type (type); |
| 93 | maddr = (LONGEST) SYMBOL_VALUE_ADDRESS (msymbol); |
| 94 | val = value_from_longest (type, maddr); |
| 95 | } |
| 96 | else |
| 97 | { |
| 98 | error ("evaluation of this expression requires the program to have a function \"malloc\"."); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | blocklen = value_from_longest (builtin_type_int, (LONGEST) len); |
| 103 | val = call_function_by_hand (val, 1, &blocklen); |
| 104 | if (value_logical_not (val)) |
| 105 | { |
| 106 | error ("No memory available to program."); |
| 107 | } |
| 108 | return (value_as_long (val)); |
| 109 | } |
| 110 | |
| 111 | /* Cast value ARG2 to type TYPE and return as a value. |
| 112 | More general than a C cast: accepts any two types of the same length, |
| 113 | and if ARG2 is an lvalue it can be cast into anything at all. */ |
| 114 | /* In C++, casts may change pointer representations. */ |
| 115 | |
| 116 | value |
| 117 | value_cast (type, arg2) |
| 118 | struct type *type; |
| 119 | register value arg2; |
| 120 | { |
| 121 | register enum type_code code1; |
| 122 | register enum type_code code2; |
| 123 | register int scalar; |
| 124 | |
| 125 | /* Coerce arrays but not enums. Enums will work as-is |
| 126 | and coercing them would cause an infinite recursion. */ |
| 127 | if (TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_ENUM) |
| 128 | COERCE_ARRAY (arg2); |
| 129 | |
| 130 | code1 = TYPE_CODE (type); |
| 131 | code2 = TYPE_CODE (VALUE_TYPE (arg2)); |
| 132 | scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT |
| 133 | || code2 == TYPE_CODE_ENUM); |
| 134 | |
| 135 | if (code1 == TYPE_CODE_FLT && scalar) |
| 136 | return value_from_double (type, value_as_double (arg2)); |
| 137 | else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM) |
| 138 | && (scalar || code2 == TYPE_CODE_PTR)) |
| 139 | return value_from_longest (type, value_as_long (arg2)); |
| 140 | else if (TYPE_LENGTH (type) == TYPE_LENGTH (VALUE_TYPE (arg2))) |
| 141 | { |
| 142 | if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR) |
| 143 | { |
| 144 | /* Look in the type of the source to see if it contains the |
| 145 | type of the target as a superclass. If so, we'll need to |
| 146 | offset the pointer rather than just change its type. */ |
| 147 | struct type *t1 = TYPE_TARGET_TYPE (type); |
| 148 | struct type *t2 = TYPE_TARGET_TYPE (VALUE_TYPE (arg2)); |
| 149 | if ( TYPE_CODE (t1) == TYPE_CODE_STRUCT |
| 150 | && TYPE_CODE (t2) == TYPE_CODE_STRUCT |
| 151 | && TYPE_NAME (t1) != 0) /* if name unknown, can't have supercl */ |
| 152 | { |
| 153 | value v = search_struct_field (type_name_no_tag (t1), |
| 154 | value_ind (arg2), 0, t2, 1); |
| 155 | if (v) |
| 156 | { |
| 157 | v = value_addr (v); |
| 158 | VALUE_TYPE (v) = type; |
| 159 | return v; |
| 160 | } |
| 161 | } |
| 162 | /* No superclass found, just fall through to change ptr type. */ |
| 163 | } |
| 164 | VALUE_TYPE (arg2) = type; |
| 165 | return arg2; |
| 166 | } |
| 167 | else if (VALUE_LVAL (arg2) == lval_memory) |
| 168 | { |
| 169 | return value_at_lazy (type, VALUE_ADDRESS (arg2) + VALUE_OFFSET (arg2)); |
| 170 | } |
| 171 | else if (code1 == TYPE_CODE_VOID) |
| 172 | { |
| 173 | return value_zero (builtin_type_void, not_lval); |
| 174 | } |
| 175 | else |
| 176 | { |
| 177 | error ("Invalid cast."); |
| 178 | return 0; |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | /* Create a value of type TYPE that is zero, and return it. */ |
| 183 | |
| 184 | value |
| 185 | value_zero (type, lv) |
| 186 | struct type *type; |
| 187 | enum lval_type lv; |
| 188 | { |
| 189 | register value val = allocate_value (type); |
| 190 | |
| 191 | memset (VALUE_CONTENTS (val), 0, TYPE_LENGTH (type)); |
| 192 | VALUE_LVAL (val) = lv; |
| 193 | |
| 194 | return val; |
| 195 | } |
| 196 | |
| 197 | /* Return a value with type TYPE located at ADDR. |
| 198 | |
| 199 | Call value_at only if the data needs to be fetched immediately; |
| 200 | if we can be 'lazy' and defer the fetch, perhaps indefinately, call |
| 201 | value_at_lazy instead. value_at_lazy simply records the address of |
| 202 | the data and sets the lazy-evaluation-required flag. The lazy flag |
| 203 | is tested in the VALUE_CONTENTS macro, which is used if and when |
| 204 | the contents are actually required. */ |
| 205 | |
| 206 | value |
| 207 | value_at (type, addr) |
| 208 | struct type *type; |
| 209 | CORE_ADDR addr; |
| 210 | { |
| 211 | register value val = allocate_value (type); |
| 212 | |
| 213 | read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (type)); |
| 214 | |
| 215 | VALUE_LVAL (val) = lval_memory; |
| 216 | VALUE_ADDRESS (val) = addr; |
| 217 | |
| 218 | return val; |
| 219 | } |
| 220 | |
| 221 | /* Return a lazy value with type TYPE located at ADDR (cf. value_at). */ |
| 222 | |
| 223 | value |
| 224 | value_at_lazy (type, addr) |
| 225 | struct type *type; |
| 226 | CORE_ADDR addr; |
| 227 | { |
| 228 | register value val = allocate_value (type); |
| 229 | |
| 230 | VALUE_LVAL (val) = lval_memory; |
| 231 | VALUE_ADDRESS (val) = addr; |
| 232 | VALUE_LAZY (val) = 1; |
| 233 | |
| 234 | return val; |
| 235 | } |
| 236 | |
| 237 | /* Called only from the VALUE_CONTENTS macro, if the current data for |
| 238 | a variable needs to be loaded into VALUE_CONTENTS(VAL). Fetches the |
| 239 | data from the user's process, and clears the lazy flag to indicate |
| 240 | that the data in the buffer is valid. |
| 241 | |
| 242 | If the value is zero-length, we avoid calling read_memory, which would |
| 243 | abort. We mark the value as fetched anyway -- all 0 bytes of it. |
| 244 | |
| 245 | This function returns a value because it is used in the VALUE_CONTENTS |
| 246 | macro as part of an expression, where a void would not work. The |
| 247 | value is ignored. */ |
| 248 | |
| 249 | int |
| 250 | value_fetch_lazy (val) |
| 251 | register value val; |
| 252 | { |
| 253 | CORE_ADDR addr = VALUE_ADDRESS (val) + VALUE_OFFSET (val); |
| 254 | |
| 255 | if (TYPE_LENGTH (VALUE_TYPE (val))) |
| 256 | read_memory (addr, VALUE_CONTENTS_RAW (val), |
| 257 | TYPE_LENGTH (VALUE_TYPE (val))); |
| 258 | VALUE_LAZY (val) = 0; |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | |
| 263 | /* Store the contents of FROMVAL into the location of TOVAL. |
| 264 | Return a new value with the location of TOVAL and contents of FROMVAL. */ |
| 265 | |
| 266 | value |
| 267 | value_assign (toval, fromval) |
| 268 | register value toval, fromval; |
| 269 | { |
| 270 | register struct type *type = VALUE_TYPE (toval); |
| 271 | register value val; |
| 272 | char raw_buffer[MAX_REGISTER_RAW_SIZE]; |
| 273 | char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE]; |
| 274 | int use_buffer = 0; |
| 275 | |
| 276 | COERCE_ARRAY (fromval); |
| 277 | COERCE_REF (toval); |
| 278 | |
| 279 | if (VALUE_LVAL (toval) != lval_internalvar) |
| 280 | fromval = value_cast (type, fromval); |
| 281 | |
| 282 | /* If TOVAL is a special machine register requiring conversion |
| 283 | of program values to a special raw format, |
| 284 | convert FROMVAL's contents now, with result in `raw_buffer', |
| 285 | and set USE_BUFFER to the number of bytes to write. */ |
| 286 | |
| 287 | if (VALUE_REGNO (toval) >= 0 |
| 288 | && REGISTER_CONVERTIBLE (VALUE_REGNO (toval))) |
| 289 | { |
| 290 | int regno = VALUE_REGNO (toval); |
| 291 | if (VALUE_TYPE (fromval) != REGISTER_VIRTUAL_TYPE (regno)) |
| 292 | fromval = value_cast (REGISTER_VIRTUAL_TYPE (regno), fromval); |
| 293 | memcpy (virtual_buffer, VALUE_CONTENTS (fromval), |
| 294 | REGISTER_VIRTUAL_SIZE (regno)); |
| 295 | REGISTER_CONVERT_TO_RAW (regno, virtual_buffer, raw_buffer); |
| 296 | use_buffer = REGISTER_RAW_SIZE (regno); |
| 297 | } |
| 298 | |
| 299 | switch (VALUE_LVAL (toval)) |
| 300 | { |
| 301 | case lval_internalvar: |
| 302 | set_internalvar (VALUE_INTERNALVAR (toval), fromval); |
| 303 | break; |
| 304 | |
| 305 | case lval_internalvar_component: |
| 306 | set_internalvar_component (VALUE_INTERNALVAR (toval), |
| 307 | VALUE_OFFSET (toval), |
| 308 | VALUE_BITPOS (toval), |
| 309 | VALUE_BITSIZE (toval), |
| 310 | fromval); |
| 311 | break; |
| 312 | |
| 313 | case lval_memory: |
| 314 | if (VALUE_BITSIZE (toval)) |
| 315 | { |
| 316 | int v; /* FIXME, this won't work for large bitfields */ |
| 317 | read_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 318 | (char *) &v, sizeof v); |
| 319 | modify_field ((char *) &v, (int) value_as_long (fromval), |
| 320 | VALUE_BITPOS (toval), VALUE_BITSIZE (toval)); |
| 321 | write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 322 | (char *)&v, sizeof v); |
| 323 | } |
| 324 | else if (use_buffer) |
| 325 | write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 326 | raw_buffer, use_buffer); |
| 327 | else |
| 328 | write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 329 | VALUE_CONTENTS (fromval), TYPE_LENGTH (type)); |
| 330 | break; |
| 331 | |
| 332 | case lval_register: |
| 333 | if (VALUE_BITSIZE (toval)) |
| 334 | { |
| 335 | int v; |
| 336 | |
| 337 | read_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 338 | (char *) &v, sizeof v); |
| 339 | modify_field ((char *) &v, (int) value_as_long (fromval), |
| 340 | VALUE_BITPOS (toval), VALUE_BITSIZE (toval)); |
| 341 | write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 342 | (char *) &v, sizeof v); |
| 343 | } |
| 344 | else if (use_buffer) |
| 345 | write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 346 | raw_buffer, use_buffer); |
| 347 | else |
| 348 | write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval), |
| 349 | VALUE_CONTENTS (fromval), TYPE_LENGTH (type)); |
| 350 | break; |
| 351 | |
| 352 | case lval_reg_frame_relative: |
| 353 | { |
| 354 | /* value is stored in a series of registers in the frame |
| 355 | specified by the structure. Copy that value out, modify |
| 356 | it, and copy it back in. */ |
| 357 | int amount_to_copy = (VALUE_BITSIZE (toval) ? 1 : TYPE_LENGTH (type)); |
| 358 | int reg_size = REGISTER_RAW_SIZE (VALUE_FRAME_REGNUM (toval)); |
| 359 | int byte_offset = VALUE_OFFSET (toval) % reg_size; |
| 360 | int reg_offset = VALUE_OFFSET (toval) / reg_size; |
| 361 | int amount_copied; |
| 362 | char *buffer = (char *) alloca (amount_to_copy); |
| 363 | int regno; |
| 364 | FRAME frame; |
| 365 | |
| 366 | /* Figure out which frame this is in currently. */ |
| 367 | for (frame = get_current_frame (); |
| 368 | frame && FRAME_FP (frame) != VALUE_FRAME (toval); |
| 369 | frame = get_prev_frame (frame)) |
| 370 | ; |
| 371 | |
| 372 | if (!frame) |
| 373 | error ("Value being assigned to is no longer active."); |
| 374 | |
| 375 | amount_to_copy += (reg_size - amount_to_copy % reg_size); |
| 376 | |
| 377 | /* Copy it out. */ |
| 378 | for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset, |
| 379 | amount_copied = 0); |
| 380 | amount_copied < amount_to_copy; |
| 381 | amount_copied += reg_size, regno++) |
| 382 | { |
| 383 | get_saved_register (buffer + amount_copied, |
| 384 | (int *)NULL, (CORE_ADDR *)NULL, |
| 385 | frame, regno, (enum lval_type *)NULL); |
| 386 | } |
| 387 | |
| 388 | /* Modify what needs to be modified. */ |
| 389 | if (VALUE_BITSIZE (toval)) |
| 390 | modify_field (buffer + byte_offset, |
| 391 | (int) value_as_long (fromval), |
| 392 | VALUE_BITPOS (toval), VALUE_BITSIZE (toval)); |
| 393 | else if (use_buffer) |
| 394 | memcpy (buffer + byte_offset, raw_buffer, use_buffer); |
| 395 | else |
| 396 | memcpy (buffer + byte_offset, VALUE_CONTENTS (fromval), |
| 397 | TYPE_LENGTH (type)); |
| 398 | |
| 399 | /* Copy it back. */ |
| 400 | for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset, |
| 401 | amount_copied = 0); |
| 402 | amount_copied < amount_to_copy; |
| 403 | amount_copied += reg_size, regno++) |
| 404 | { |
| 405 | enum lval_type lval; |
| 406 | CORE_ADDR addr; |
| 407 | int optim; |
| 408 | |
| 409 | /* Just find out where to put it. */ |
| 410 | get_saved_register ((char *)NULL, |
| 411 | &optim, &addr, frame, regno, &lval); |
| 412 | |
| 413 | if (optim) |
| 414 | error ("Attempt to assign to a value that was optimized out."); |
| 415 | if (lval == lval_memory) |
| 416 | write_memory (addr, buffer + amount_copied, reg_size); |
| 417 | else if (lval == lval_register) |
| 418 | write_register_bytes (addr, buffer + amount_copied, reg_size); |
| 419 | else |
| 420 | error ("Attempt to assign to an unmodifiable value."); |
| 421 | } |
| 422 | } |
| 423 | break; |
| 424 | |
| 425 | |
| 426 | default: |
| 427 | error ("Left side of = operation is not an lvalue."); |
| 428 | } |
| 429 | |
| 430 | /* Return a value just like TOVAL except with the contents of FROMVAL |
| 431 | (except in the case of the type if TOVAL is an internalvar). */ |
| 432 | |
| 433 | if (VALUE_LVAL (toval) == lval_internalvar |
| 434 | || VALUE_LVAL (toval) == lval_internalvar_component) |
| 435 | { |
| 436 | type = VALUE_TYPE (fromval); |
| 437 | } |
| 438 | |
| 439 | val = allocate_value (type); |
| 440 | memcpy (val, toval, VALUE_CONTENTS_RAW (val) - (char *) val); |
| 441 | memcpy (VALUE_CONTENTS_RAW (val), VALUE_CONTENTS (fromval), |
| 442 | TYPE_LENGTH (type)); |
| 443 | VALUE_TYPE (val) = type; |
| 444 | |
| 445 | return val; |
| 446 | } |
| 447 | |
| 448 | /* Extend a value VAL to COUNT repetitions of its type. */ |
| 449 | |
| 450 | value |
| 451 | value_repeat (arg1, count) |
| 452 | value arg1; |
| 453 | int count; |
| 454 | { |
| 455 | register value val; |
| 456 | |
| 457 | if (VALUE_LVAL (arg1) != lval_memory) |
| 458 | error ("Only values in memory can be extended with '@'."); |
| 459 | if (count < 1) |
| 460 | error ("Invalid number %d of repetitions.", count); |
| 461 | |
| 462 | val = allocate_repeat_value (VALUE_TYPE (arg1), count); |
| 463 | |
| 464 | read_memory (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1), |
| 465 | VALUE_CONTENTS_RAW (val), |
| 466 | TYPE_LENGTH (VALUE_TYPE (val)) * count); |
| 467 | VALUE_LVAL (val) = lval_memory; |
| 468 | VALUE_ADDRESS (val) = VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1); |
| 469 | |
| 470 | return val; |
| 471 | } |
| 472 | |
| 473 | value |
| 474 | value_of_variable (var) |
| 475 | struct symbol *var; |
| 476 | { |
| 477 | value val; |
| 478 | |
| 479 | val = read_var_value (var, (FRAME) 0); |
| 480 | if (val == 0) |
| 481 | error ("Address of symbol \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var)); |
| 482 | return val; |
| 483 | } |
| 484 | |
| 485 | /* Given a value which is an array, return a value which is a pointer to its |
| 486 | first element, regardless of whether or not the array has a nonzero lower |
| 487 | bound. |
| 488 | |
| 489 | FIXME: A previous comment here indicated that this routine should be |
| 490 | substracting the array's lower bound. It's not clear to me that this |
| 491 | is correct. Given an array subscripting operation, it would certainly |
| 492 | work to do the adjustment here, essentially computing: |
| 493 | |
| 494 | (&array[0] - (lowerbound * sizeof array[0])) + (index * sizeof array[0]) |
| 495 | |
| 496 | However I believe a more appropriate and logical place to account for |
| 497 | the lower bound is to do so in value_subscript, essentially computing: |
| 498 | |
| 499 | (&array[0] + ((index - lowerbound) * sizeof array[0])) |
| 500 | |
| 501 | As further evidence consider what would happen with operations other |
| 502 | than array subscripting, where the caller would get back a value that |
| 503 | had an address somewhere before the actual first element of the array, |
| 504 | and the information about the lower bound would be lost because of |
| 505 | the coercion to pointer type. |
| 506 | */ |
| 507 | |
| 508 | value |
| 509 | value_coerce_array (arg1) |
| 510 | value arg1; |
| 511 | { |
| 512 | register struct type *type; |
| 513 | |
| 514 | if (VALUE_LVAL (arg1) != lval_memory) |
| 515 | error ("Attempt to take address of value not located in memory."); |
| 516 | |
| 517 | /* Get type of elements. */ |
| 518 | if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_ARRAY) |
| 519 | type = TYPE_TARGET_TYPE (VALUE_TYPE (arg1)); |
| 520 | else |
| 521 | /* A phony array made by value_repeat. |
| 522 | Its type is the type of the elements, not an array type. */ |
| 523 | type = VALUE_TYPE (arg1); |
| 524 | |
| 525 | return value_from_longest (lookup_pointer_type (type), |
| 526 | (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1))); |
| 527 | } |
| 528 | |
| 529 | /* Given a value which is a function, return a value which is a pointer |
| 530 | to it. */ |
| 531 | |
| 532 | value |
| 533 | value_coerce_function (arg1) |
| 534 | value arg1; |
| 535 | { |
| 536 | |
| 537 | if (VALUE_LVAL (arg1) != lval_memory) |
| 538 | error ("Attempt to take address of value not located in memory."); |
| 539 | |
| 540 | return value_from_longest (lookup_pointer_type (VALUE_TYPE (arg1)), |
| 541 | (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1))); |
| 542 | } |
| 543 | |
| 544 | /* Return a pointer value for the object for which ARG1 is the contents. */ |
| 545 | |
| 546 | value |
| 547 | value_addr (arg1) |
| 548 | value arg1; |
| 549 | { |
| 550 | struct type *type = VALUE_TYPE (arg1); |
| 551 | if (TYPE_CODE (type) == TYPE_CODE_REF) |
| 552 | { |
| 553 | /* Copy the value, but change the type from (T&) to (T*). |
| 554 | We keep the same location information, which is efficient, |
| 555 | and allows &(&X) to get the location containing the reference. */ |
| 556 | value arg2 = value_copy (arg1); |
| 557 | VALUE_TYPE (arg2) = lookup_pointer_type (TYPE_TARGET_TYPE (type)); |
| 558 | return arg2; |
| 559 | } |
| 560 | if (VALUE_REPEATED (arg1) |
| 561 | || TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 562 | return value_coerce_array (arg1); |
| 563 | if (TYPE_CODE (type) == TYPE_CODE_FUNC) |
| 564 | return value_coerce_function (arg1); |
| 565 | |
| 566 | if (VALUE_LVAL (arg1) != lval_memory) |
| 567 | error ("Attempt to take address of value not located in memory."); |
| 568 | |
| 569 | return value_from_longest (lookup_pointer_type (type), |
| 570 | (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1))); |
| 571 | } |
| 572 | |
| 573 | /* Given a value of a pointer type, apply the C unary * operator to it. */ |
| 574 | |
| 575 | value |
| 576 | value_ind (arg1) |
| 577 | value arg1; |
| 578 | { |
| 579 | COERCE_ARRAY (arg1); |
| 580 | |
| 581 | if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_MEMBER) |
| 582 | error ("not implemented: member types in value_ind"); |
| 583 | |
| 584 | /* Allow * on an integer so we can cast it to whatever we want. |
| 585 | This returns an int, which seems like the most C-like thing |
| 586 | to do. "long long" variables are rare enough that |
| 587 | BUILTIN_TYPE_LONGEST would seem to be a mistake. */ |
| 588 | if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_INT) |
| 589 | return value_at (builtin_type_int, |
| 590 | (CORE_ADDR) value_as_long (arg1)); |
| 591 | else if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR) |
| 592 | return value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)), |
| 593 | value_as_pointer (arg1)); |
| 594 | error ("Attempt to take contents of a non-pointer value."); |
| 595 | return 0; /* For lint -- never reached */ |
| 596 | } |
| 597 | \f |
| 598 | /* Pushing small parts of stack frames. */ |
| 599 | |
| 600 | /* Push one word (the size of object that a register holds). */ |
| 601 | |
| 602 | CORE_ADDR |
| 603 | push_word (sp, buffer) |
| 604 | CORE_ADDR sp; |
| 605 | REGISTER_TYPE buffer; |
| 606 | { |
| 607 | register int len = sizeof (REGISTER_TYPE); |
| 608 | |
| 609 | SWAP_TARGET_AND_HOST (&buffer, len); |
| 610 | #if 1 INNER_THAN 2 |
| 611 | sp -= len; |
| 612 | write_memory (sp, (char *)&buffer, len); |
| 613 | #else /* stack grows upward */ |
| 614 | write_memory (sp, (char *)&buffer, len); |
| 615 | sp += len; |
| 616 | #endif /* stack grows upward */ |
| 617 | |
| 618 | return sp; |
| 619 | } |
| 620 | |
| 621 | /* Push LEN bytes with data at BUFFER. */ |
| 622 | |
| 623 | CORE_ADDR |
| 624 | push_bytes (sp, buffer, len) |
| 625 | CORE_ADDR sp; |
| 626 | char *buffer; |
| 627 | int len; |
| 628 | { |
| 629 | #if 1 INNER_THAN 2 |
| 630 | sp -= len; |
| 631 | write_memory (sp, buffer, len); |
| 632 | #else /* stack grows upward */ |
| 633 | write_memory (sp, buffer, len); |
| 634 | sp += len; |
| 635 | #endif /* stack grows upward */ |
| 636 | |
| 637 | return sp; |
| 638 | } |
| 639 | |
| 640 | /* Push onto the stack the specified value VALUE. */ |
| 641 | |
| 642 | static CORE_ADDR |
| 643 | value_push (sp, arg) |
| 644 | register CORE_ADDR sp; |
| 645 | value arg; |
| 646 | { |
| 647 | register int len = TYPE_LENGTH (VALUE_TYPE (arg)); |
| 648 | |
| 649 | #if 1 INNER_THAN 2 |
| 650 | sp -= len; |
| 651 | write_memory (sp, VALUE_CONTENTS (arg), len); |
| 652 | #else /* stack grows upward */ |
| 653 | write_memory (sp, VALUE_CONTENTS (arg), len); |
| 654 | sp += len; |
| 655 | #endif /* stack grows upward */ |
| 656 | |
| 657 | return sp; |
| 658 | } |
| 659 | |
| 660 | /* Perform the standard coercions that are specified |
| 661 | for arguments to be passed to C functions. */ |
| 662 | |
| 663 | value |
| 664 | value_arg_coerce (arg) |
| 665 | value arg; |
| 666 | { |
| 667 | register struct type *type; |
| 668 | |
| 669 | COERCE_ENUM (arg); |
| 670 | #if 1 /* FIXME: This is only a temporary patch. -fnf */ |
| 671 | if (VALUE_REPEATED (arg) |
| 672 | || TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_ARRAY) |
| 673 | arg = value_coerce_array (arg); |
| 674 | if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FUNC) |
| 675 | arg = value_coerce_function (arg); |
| 676 | #endif |
| 677 | |
| 678 | type = VALUE_TYPE (arg); |
| 679 | |
| 680 | if (TYPE_CODE (type) == TYPE_CODE_INT |
| 681 | && TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int)) |
| 682 | return value_cast (builtin_type_int, arg); |
| 683 | |
| 684 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 685 | && TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_double)) |
| 686 | return value_cast (builtin_type_double, arg); |
| 687 | |
| 688 | return arg; |
| 689 | } |
| 690 | |
| 691 | /* Push the value ARG, first coercing it as an argument |
| 692 | to a C function. */ |
| 693 | |
| 694 | static CORE_ADDR |
| 695 | value_arg_push (sp, arg) |
| 696 | register CORE_ADDR sp; |
| 697 | value arg; |
| 698 | { |
| 699 | return value_push (sp, value_arg_coerce (arg)); |
| 700 | } |
| 701 | |
| 702 | /* Determine a function's address and its return type from its value. |
| 703 | Calls error() if the function is not valid for calling. */ |
| 704 | |
| 705 | static CORE_ADDR |
| 706 | find_function_addr (function, retval_type) |
| 707 | value function; |
| 708 | struct type **retval_type; |
| 709 | { |
| 710 | register struct type *ftype = VALUE_TYPE (function); |
| 711 | register enum type_code code = TYPE_CODE (ftype); |
| 712 | struct type *value_type; |
| 713 | CORE_ADDR funaddr; |
| 714 | |
| 715 | /* If it's a member function, just look at the function |
| 716 | part of it. */ |
| 717 | |
| 718 | /* Determine address to call. */ |
| 719 | if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD) |
| 720 | { |
| 721 | funaddr = VALUE_ADDRESS (function); |
| 722 | value_type = TYPE_TARGET_TYPE (ftype); |
| 723 | } |
| 724 | else if (code == TYPE_CODE_PTR) |
| 725 | { |
| 726 | funaddr = value_as_pointer (function); |
| 727 | if (TYPE_CODE (TYPE_TARGET_TYPE (ftype)) == TYPE_CODE_FUNC |
| 728 | || TYPE_CODE (TYPE_TARGET_TYPE (ftype)) == TYPE_CODE_METHOD) |
| 729 | value_type = TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (ftype)); |
| 730 | else |
| 731 | value_type = builtin_type_int; |
| 732 | } |
| 733 | else if (code == TYPE_CODE_INT) |
| 734 | { |
| 735 | /* Handle the case of functions lacking debugging info. |
| 736 | Their values are characters since their addresses are char */ |
| 737 | if (TYPE_LENGTH (ftype) == 1) |
| 738 | funaddr = value_as_pointer (value_addr (function)); |
| 739 | else |
| 740 | /* Handle integer used as address of a function. */ |
| 741 | funaddr = (CORE_ADDR) value_as_long (function); |
| 742 | |
| 743 | value_type = builtin_type_int; |
| 744 | } |
| 745 | else |
| 746 | error ("Invalid data type for function to be called."); |
| 747 | |
| 748 | *retval_type = value_type; |
| 749 | return funaddr; |
| 750 | } |
| 751 | |
| 752 | #if defined (CALL_DUMMY) |
| 753 | /* All this stuff with a dummy frame may seem unnecessarily complicated |
| 754 | (why not just save registers in GDB?). The purpose of pushing a dummy |
| 755 | frame which looks just like a real frame is so that if you call a |
| 756 | function and then hit a breakpoint (get a signal, etc), "backtrace" |
| 757 | will look right. Whether the backtrace needs to actually show the |
| 758 | stack at the time the inferior function was called is debatable, but |
| 759 | it certainly needs to not display garbage. So if you are contemplating |
| 760 | making dummy frames be different from normal frames, consider that. */ |
| 761 | |
| 762 | /* Perform a function call in the inferior. |
| 763 | ARGS is a vector of values of arguments (NARGS of them). |
| 764 | FUNCTION is a value, the function to be called. |
| 765 | Returns a value representing what the function returned. |
| 766 | May fail to return, if a breakpoint or signal is hit |
| 767 | during the execution of the function. */ |
| 768 | |
| 769 | value |
| 770 | call_function_by_hand (function, nargs, args) |
| 771 | value function; |
| 772 | int nargs; |
| 773 | value *args; |
| 774 | { |
| 775 | register CORE_ADDR sp; |
| 776 | register int i; |
| 777 | CORE_ADDR start_sp; |
| 778 | /* CALL_DUMMY is an array of words (REGISTER_TYPE), but each word |
| 779 | is in host byte order. It is switched to target byte order before calling |
| 780 | FIX_CALL_DUMMY. */ |
| 781 | static REGISTER_TYPE dummy[] = CALL_DUMMY; |
| 782 | REGISTER_TYPE dummy1[sizeof dummy / sizeof (REGISTER_TYPE)]; |
| 783 | CORE_ADDR old_sp; |
| 784 | struct type *value_type; |
| 785 | unsigned char struct_return; |
| 786 | CORE_ADDR struct_addr; |
| 787 | struct inferior_status inf_status; |
| 788 | struct cleanup *old_chain; |
| 789 | CORE_ADDR funaddr; |
| 790 | int using_gcc; |
| 791 | CORE_ADDR real_pc; |
| 792 | |
| 793 | if (!target_has_execution) |
| 794 | noprocess(); |
| 795 | |
| 796 | save_inferior_status (&inf_status, 1); |
| 797 | old_chain = make_cleanup (restore_inferior_status, &inf_status); |
| 798 | |
| 799 | /* PUSH_DUMMY_FRAME is responsible for saving the inferior registers |
| 800 | (and POP_FRAME for restoring them). (At least on most machines) |
| 801 | they are saved on the stack in the inferior. */ |
| 802 | PUSH_DUMMY_FRAME; |
| 803 | |
| 804 | old_sp = sp = read_register (SP_REGNUM); |
| 805 | |
| 806 | #if 1 INNER_THAN 2 /* Stack grows down */ |
| 807 | sp -= sizeof dummy; |
| 808 | start_sp = sp; |
| 809 | #else /* Stack grows up */ |
| 810 | start_sp = sp; |
| 811 | sp += sizeof dummy; |
| 812 | #endif |
| 813 | |
| 814 | funaddr = find_function_addr (function, &value_type); |
| 815 | |
| 816 | { |
| 817 | struct block *b = block_for_pc (funaddr); |
| 818 | /* If compiled without -g, assume GCC. */ |
| 819 | using_gcc = b == NULL || BLOCK_GCC_COMPILED (b); |
| 820 | } |
| 821 | |
| 822 | /* Are we returning a value using a structure return or a normal |
| 823 | value return? */ |
| 824 | |
| 825 | struct_return = using_struct_return (function, funaddr, value_type, |
| 826 | using_gcc); |
| 827 | |
| 828 | /* Create a call sequence customized for this function |
| 829 | and the number of arguments for it. */ |
| 830 | memcpy (dummy1, dummy, sizeof dummy); |
| 831 | for (i = 0; i < sizeof dummy / sizeof (REGISTER_TYPE); i++) |
| 832 | SWAP_TARGET_AND_HOST (&dummy1[i], sizeof (REGISTER_TYPE)); |
| 833 | |
| 834 | #ifdef GDB_TARGET_IS_HPPA |
| 835 | real_pc = FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args, |
| 836 | value_type, using_gcc); |
| 837 | #else |
| 838 | FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args, |
| 839 | value_type, using_gcc); |
| 840 | real_pc = start_sp; |
| 841 | #endif |
| 842 | |
| 843 | #if CALL_DUMMY_LOCATION == ON_STACK |
| 844 | write_memory (start_sp, (char *)dummy1, sizeof dummy); |
| 845 | |
| 846 | #else /* Not on stack. */ |
| 847 | #if CALL_DUMMY_LOCATION == BEFORE_TEXT_END |
| 848 | /* Convex Unix prohibits executing in the stack segment. */ |
| 849 | /* Hope there is empty room at the top of the text segment. */ |
| 850 | { |
| 851 | extern CORE_ADDR text_end; |
| 852 | static checked = 0; |
| 853 | if (!checked) |
| 854 | for (start_sp = text_end - sizeof dummy; start_sp < text_end; ++start_sp) |
| 855 | if (read_memory_integer (start_sp, 1) != 0) |
| 856 | error ("text segment full -- no place to put call"); |
| 857 | checked = 1; |
| 858 | sp = old_sp; |
| 859 | start_sp = text_end - sizeof dummy; |
| 860 | write_memory (start_sp, (char *)dummy1, sizeof dummy); |
| 861 | } |
| 862 | #else /* After text_end. */ |
| 863 | { |
| 864 | extern CORE_ADDR text_end; |
| 865 | int errcode; |
| 866 | sp = old_sp; |
| 867 | start_sp = text_end; |
| 868 | errcode = target_write_memory (start_sp, (char *)dummy1, sizeof dummy); |
| 869 | if (errcode != 0) |
| 870 | error ("Cannot write text segment -- call_function failed"); |
| 871 | } |
| 872 | #endif /* After text_end. */ |
| 873 | #endif /* Not on stack. */ |
| 874 | |
| 875 | #ifdef lint |
| 876 | sp = old_sp; /* It really is used, for some ifdef's... */ |
| 877 | #endif |
| 878 | |
| 879 | #ifdef STACK_ALIGN |
| 880 | /* If stack grows down, we must leave a hole at the top. */ |
| 881 | { |
| 882 | int len = 0; |
| 883 | |
| 884 | /* Reserve space for the return structure to be written on the |
| 885 | stack, if necessary */ |
| 886 | |
| 887 | if (struct_return) |
| 888 | len += TYPE_LENGTH (value_type); |
| 889 | |
| 890 | for (i = nargs - 1; i >= 0; i--) |
| 891 | len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i]))); |
| 892 | #ifdef CALL_DUMMY_STACK_ADJUST |
| 893 | len += CALL_DUMMY_STACK_ADJUST; |
| 894 | #endif |
| 895 | #if 1 INNER_THAN 2 |
| 896 | sp -= STACK_ALIGN (len) - len; |
| 897 | #else |
| 898 | sp += STACK_ALIGN (len) - len; |
| 899 | #endif |
| 900 | } |
| 901 | #endif /* STACK_ALIGN */ |
| 902 | |
| 903 | /* Reserve space for the return structure to be written on the |
| 904 | stack, if necessary */ |
| 905 | |
| 906 | if (struct_return) |
| 907 | { |
| 908 | #if 1 INNER_THAN 2 |
| 909 | sp -= TYPE_LENGTH (value_type); |
| 910 | struct_addr = sp; |
| 911 | #else |
| 912 | struct_addr = sp; |
| 913 | sp += TYPE_LENGTH (value_type); |
| 914 | #endif |
| 915 | } |
| 916 | |
| 917 | #if defined (REG_STRUCT_HAS_ADDR) |
| 918 | { |
| 919 | /* This is a machine like the sparc, where we need to pass a pointer |
| 920 | to the structure, not the structure itself. */ |
| 921 | if (REG_STRUCT_HAS_ADDR (using_gcc)) |
| 922 | for (i = nargs - 1; i >= 0; i--) |
| 923 | if (TYPE_CODE (VALUE_TYPE (args[i])) == TYPE_CODE_STRUCT) |
| 924 | { |
| 925 | CORE_ADDR addr; |
| 926 | #if !(1 INNER_THAN 2) |
| 927 | /* The stack grows up, so the address of the thing we push |
| 928 | is the stack pointer before we push it. */ |
| 929 | addr = sp; |
| 930 | #endif |
| 931 | /* Push the structure. */ |
| 932 | sp = value_push (sp, args[i]); |
| 933 | #if 1 INNER_THAN 2 |
| 934 | /* The stack grows down, so the address of the thing we push |
| 935 | is the stack pointer after we push it. */ |
| 936 | addr = sp; |
| 937 | #endif |
| 938 | /* The value we're going to pass is the address of the thing |
| 939 | we just pushed. */ |
| 940 | args[i] = value_from_longest (lookup_pointer_type (value_type), |
| 941 | (LONGEST) addr); |
| 942 | } |
| 943 | } |
| 944 | #endif /* REG_STRUCT_HAS_ADDR. */ |
| 945 | |
| 946 | #ifdef PUSH_ARGUMENTS |
| 947 | PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr); |
| 948 | #else /* !PUSH_ARGUMENTS */ |
| 949 | for (i = nargs - 1; i >= 0; i--) |
| 950 | sp = value_arg_push (sp, args[i]); |
| 951 | #endif /* !PUSH_ARGUMENTS */ |
| 952 | |
| 953 | #ifdef CALL_DUMMY_STACK_ADJUST |
| 954 | #if 1 INNER_THAN 2 |
| 955 | sp -= CALL_DUMMY_STACK_ADJUST; |
| 956 | #else |
| 957 | sp += CALL_DUMMY_STACK_ADJUST; |
| 958 | #endif |
| 959 | #endif /* CALL_DUMMY_STACK_ADJUST */ |
| 960 | |
| 961 | /* Store the address at which the structure is supposed to be |
| 962 | written. Note that this (and the code which reserved the space |
| 963 | above) assumes that gcc was used to compile this function. Since |
| 964 | it doesn't cost us anything but space and if the function is pcc |
| 965 | it will ignore this value, we will make that assumption. |
| 966 | |
| 967 | Also note that on some machines (like the sparc) pcc uses a |
| 968 | convention like gcc's. */ |
| 969 | |
| 970 | if (struct_return) |
| 971 | STORE_STRUCT_RETURN (struct_addr, sp); |
| 972 | |
| 973 | /* Write the stack pointer. This is here because the statements above |
| 974 | might fool with it. On SPARC, this write also stores the register |
| 975 | window into the right place in the new stack frame, which otherwise |
| 976 | wouldn't happen. (See write_inferior_registers in sparc-xdep.c.) */ |
| 977 | write_register (SP_REGNUM, sp); |
| 978 | |
| 979 | /* Figure out the value returned by the function. */ |
| 980 | { |
| 981 | char retbuf[REGISTER_BYTES]; |
| 982 | |
| 983 | /* Execute the stack dummy routine, calling FUNCTION. |
| 984 | When it is done, discard the empty frame |
| 985 | after storing the contents of all regs into retbuf. */ |
| 986 | run_stack_dummy (real_pc + CALL_DUMMY_START_OFFSET, retbuf); |
| 987 | |
| 988 | do_cleanups (old_chain); |
| 989 | |
| 990 | return value_being_returned (value_type, retbuf, struct_return); |
| 991 | } |
| 992 | } |
| 993 | #else /* no CALL_DUMMY. */ |
| 994 | value |
| 995 | call_function_by_hand (function, nargs, args) |
| 996 | value function; |
| 997 | int nargs; |
| 998 | value *args; |
| 999 | { |
| 1000 | error ("Cannot invoke functions on this machine."); |
| 1001 | } |
| 1002 | #endif /* no CALL_DUMMY. */ |
| 1003 | |
| 1004 | \f |
| 1005 | /* Create a value for an array by allocating space in the inferior, copying |
| 1006 | the data into that space, and then setting up an array value. |
| 1007 | |
| 1008 | The array bounds are set from LOWBOUND and HIGHBOUND, and the array is |
| 1009 | populated from the values passed in ELEMVEC. |
| 1010 | |
| 1011 | The element type of the array is inherited from the type of the |
| 1012 | first element, and all elements must have the same size (though we |
| 1013 | don't currently enforce any restriction on their types). */ |
| 1014 | |
| 1015 | value |
| 1016 | value_array (lowbound, highbound, elemvec) |
| 1017 | int lowbound; |
| 1018 | int highbound; |
| 1019 | value *elemvec; |
| 1020 | { |
| 1021 | int nelem; |
| 1022 | int idx; |
| 1023 | int typelength; |
| 1024 | value val; |
| 1025 | struct type *rangetype; |
| 1026 | struct type *arraytype; |
| 1027 | CORE_ADDR addr; |
| 1028 | |
| 1029 | /* Validate that the bounds are reasonable and that each of the elements |
| 1030 | have the same size. */ |
| 1031 | |
| 1032 | nelem = highbound - lowbound + 1; |
| 1033 | if (nelem <= 0) |
| 1034 | { |
| 1035 | error ("bad array bounds (%d, %d)", lowbound, highbound); |
| 1036 | } |
| 1037 | typelength = TYPE_LENGTH (VALUE_TYPE (elemvec[0])); |
| 1038 | for (idx = 0; idx < nelem; idx++) |
| 1039 | { |
| 1040 | if (TYPE_LENGTH (VALUE_TYPE (elemvec[idx])) != typelength) |
| 1041 | { |
| 1042 | error ("array elements must all be the same size"); |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | /* Allocate space to store the array in the inferior, and then initialize |
| 1047 | it by copying in each element. FIXME: Is it worth it to create a |
| 1048 | local buffer in which to collect each value and then write all the |
| 1049 | bytes in one operation? */ |
| 1050 | |
| 1051 | addr = allocate_space_in_inferior (nelem * typelength); |
| 1052 | for (idx = 0; idx < nelem; idx++) |
| 1053 | { |
| 1054 | write_memory (addr + (idx * typelength), VALUE_CONTENTS (elemvec[idx]), |
| 1055 | typelength); |
| 1056 | } |
| 1057 | |
| 1058 | /* Create the array type and set up an array value to be evaluated lazily. */ |
| 1059 | |
| 1060 | rangetype = create_range_type ((struct type *) NULL, builtin_type_int, |
| 1061 | lowbound, highbound); |
| 1062 | arraytype = create_array_type ((struct type *) NULL, |
| 1063 | VALUE_TYPE (elemvec[0]), rangetype); |
| 1064 | val = value_at_lazy (arraytype, addr); |
| 1065 | return (val); |
| 1066 | } |
| 1067 | |
| 1068 | /* Create a value for a string constant by allocating space in the inferior, |
| 1069 | copying the data into that space, and returning the address with type |
| 1070 | TYPE_CODE_STRING. PTR points to the string constant data; LEN is number |
| 1071 | of characters. |
| 1072 | Note that string types are like array of char types with a lower bound of |
| 1073 | zero and an upper bound of LEN - 1. Also note that the string may contain |
| 1074 | embedded null bytes. */ |
| 1075 | |
| 1076 | value |
| 1077 | value_string (ptr, len) |
| 1078 | char *ptr; |
| 1079 | int len; |
| 1080 | { |
| 1081 | value val; |
| 1082 | struct type *rangetype; |
| 1083 | struct type *stringtype; |
| 1084 | CORE_ADDR addr; |
| 1085 | |
| 1086 | /* Allocate space to store the string in the inferior, and then |
| 1087 | copy LEN bytes from PTR in gdb to that address in the inferior. */ |
| 1088 | |
| 1089 | addr = allocate_space_in_inferior (len); |
| 1090 | write_memory (addr, ptr, len); |
| 1091 | |
| 1092 | /* Create the string type and set up a string value to be evaluated |
| 1093 | lazily. */ |
| 1094 | |
| 1095 | rangetype = create_range_type ((struct type *) NULL, builtin_type_int, |
| 1096 | 0, len - 1); |
| 1097 | stringtype = create_string_type ((struct type *) NULL, rangetype); |
| 1098 | val = value_at_lazy (stringtype, addr); |
| 1099 | return (val); |
| 1100 | } |
| 1101 | \f |
| 1102 | /* Compare two argument lists and return the position in which they differ, |
| 1103 | or zero if equal. |
| 1104 | |
| 1105 | STATICP is nonzero if the T1 argument list came from a |
| 1106 | static member function. |
| 1107 | |
| 1108 | For non-static member functions, we ignore the first argument, |
| 1109 | which is the type of the instance variable. This is because we want |
| 1110 | to handle calls with objects from derived classes. This is not |
| 1111 | entirely correct: we should actually check to make sure that a |
| 1112 | requested operation is type secure, shouldn't we? FIXME. */ |
| 1113 | |
| 1114 | static int |
| 1115 | typecmp (staticp, t1, t2) |
| 1116 | int staticp; |
| 1117 | struct type *t1[]; |
| 1118 | value t2[]; |
| 1119 | { |
| 1120 | int i; |
| 1121 | |
| 1122 | if (t2 == 0) |
| 1123 | return 1; |
| 1124 | if (staticp && t1 == 0) |
| 1125 | return t2[1] != 0; |
| 1126 | if (t1 == 0) |
| 1127 | return 1; |
| 1128 | if (TYPE_CODE (t1[0]) == TYPE_CODE_VOID) return 0; |
| 1129 | if (t1[!staticp] == 0) return 0; |
| 1130 | for (i = !staticp; t1[i] && TYPE_CODE (t1[i]) != TYPE_CODE_VOID; i++) |
| 1131 | { |
| 1132 | if (! t2[i]) |
| 1133 | return i+1; |
| 1134 | if (TYPE_CODE (t1[i]) == TYPE_CODE_REF |
| 1135 | && TYPE_TARGET_TYPE (t1[i]) == VALUE_TYPE (t2[i])) |
| 1136 | continue; |
| 1137 | if (TYPE_CODE (t1[i]) != TYPE_CODE (VALUE_TYPE (t2[i]))) |
| 1138 | return i+1; |
| 1139 | } |
| 1140 | if (!t1[i]) return 0; |
| 1141 | return t2[i] ? i+1 : 0; |
| 1142 | } |
| 1143 | |
| 1144 | /* Helper function used by value_struct_elt to recurse through baseclasses. |
| 1145 | Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes, |
| 1146 | and search in it assuming it has (class) type TYPE. |
| 1147 | If found, return value, else return NULL. |
| 1148 | |
| 1149 | If LOOKING_FOR_BASECLASS, then instead of looking for struct fields, |
| 1150 | look for a baseclass named NAME. */ |
| 1151 | |
| 1152 | static value |
| 1153 | search_struct_field (name, arg1, offset, type, looking_for_baseclass) |
| 1154 | char *name; |
| 1155 | register value arg1; |
| 1156 | int offset; |
| 1157 | register struct type *type; |
| 1158 | int looking_for_baseclass; |
| 1159 | { |
| 1160 | int i; |
| 1161 | |
| 1162 | check_stub_type (type); |
| 1163 | |
| 1164 | if (! looking_for_baseclass) |
| 1165 | for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--) |
| 1166 | { |
| 1167 | char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 1168 | |
| 1169 | if (t_field_name && STREQ (t_field_name, name)) |
| 1170 | { |
| 1171 | value v; |
| 1172 | if (TYPE_FIELD_STATIC (type, i)) |
| 1173 | { |
| 1174 | char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, i); |
| 1175 | struct symbol *sym = |
| 1176 | lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL); |
| 1177 | if (sym == NULL) |
| 1178 | error ("Internal error: could not find physical static variable named %s", |
| 1179 | phys_name); |
| 1180 | v = value_at (TYPE_FIELD_TYPE (type, i), |
| 1181 | (CORE_ADDR)SYMBOL_BLOCK_VALUE (sym)); |
| 1182 | } |
| 1183 | else |
| 1184 | v = value_primitive_field (arg1, offset, i, type); |
| 1185 | if (v == 0) |
| 1186 | error("there is no field named %s", name); |
| 1187 | return v; |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 1192 | { |
| 1193 | value v; |
| 1194 | /* If we are looking for baseclasses, this is what we get when we |
| 1195 | hit them. */ |
| 1196 | int found_baseclass = (looking_for_baseclass |
| 1197 | && STREQ (name, TYPE_BASECLASS_NAME (type, i))); |
| 1198 | |
| 1199 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 1200 | { |
| 1201 | value v2; |
| 1202 | /* Fix to use baseclass_offset instead. FIXME */ |
| 1203 | baseclass_addr (type, i, VALUE_CONTENTS (arg1) + offset, |
| 1204 | &v2, (int *)NULL); |
| 1205 | if (v2 == 0) |
| 1206 | error ("virtual baseclass botch"); |
| 1207 | if (found_baseclass) |
| 1208 | return v2; |
| 1209 | v = search_struct_field (name, v2, 0, TYPE_BASECLASS (type, i), |
| 1210 | looking_for_baseclass); |
| 1211 | } |
| 1212 | else if (found_baseclass) |
| 1213 | v = value_primitive_field (arg1, offset, i, type); |
| 1214 | else |
| 1215 | v = search_struct_field (name, arg1, |
| 1216 | offset + TYPE_BASECLASS_BITPOS (type, i) / 8, |
| 1217 | TYPE_BASECLASS (type, i), |
| 1218 | looking_for_baseclass); |
| 1219 | if (v) return v; |
| 1220 | } |
| 1221 | return NULL; |
| 1222 | } |
| 1223 | |
| 1224 | /* Helper function used by value_struct_elt to recurse through baseclasses. |
| 1225 | Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes, |
| 1226 | and search in it assuming it has (class) type TYPE. |
| 1227 | If found, return value, else return NULL. */ |
| 1228 | |
| 1229 | static value |
| 1230 | search_struct_method (name, arg1p, args, offset, static_memfuncp, type) |
| 1231 | char *name; |
| 1232 | register value *arg1p, *args; |
| 1233 | int offset, *static_memfuncp; |
| 1234 | register struct type *type; |
| 1235 | { |
| 1236 | int i; |
| 1237 | |
| 1238 | check_stub_type (type); |
| 1239 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--) |
| 1240 | { |
| 1241 | char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i); |
| 1242 | if (t_field_name && STREQ (t_field_name, name)) |
| 1243 | { |
| 1244 | int j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1; |
| 1245 | struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i); |
| 1246 | |
| 1247 | if (j > 0 && args == 0) |
| 1248 | error ("cannot resolve overloaded method `%s'", name); |
| 1249 | while (j >= 0) |
| 1250 | { |
| 1251 | if (TYPE_FN_FIELD_STUB (f, j)) |
| 1252 | check_stub_method (type, i, j); |
| 1253 | if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j), |
| 1254 | TYPE_FN_FIELD_ARGS (f, j), args)) |
| 1255 | { |
| 1256 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) |
| 1257 | return (value)value_virtual_fn_field (arg1p, f, j, type, offset); |
| 1258 | if (TYPE_FN_FIELD_STATIC_P (f, j) && static_memfuncp) |
| 1259 | *static_memfuncp = 1; |
| 1260 | return (value)value_fn_field (arg1p, f, j, type, offset); |
| 1261 | } |
| 1262 | j--; |
| 1263 | } |
| 1264 | } |
| 1265 | } |
| 1266 | |
| 1267 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 1268 | { |
| 1269 | value v; |
| 1270 | int base_offset; |
| 1271 | |
| 1272 | if (BASETYPE_VIA_VIRTUAL (type, i)) |
| 1273 | { |
| 1274 | base_offset = baseclass_offset (type, i, *arg1p, offset); |
| 1275 | if (base_offset == -1) |
| 1276 | error ("virtual baseclass botch"); |
| 1277 | } |
| 1278 | else |
| 1279 | { |
| 1280 | base_offset = TYPE_BASECLASS_BITPOS (type, i) / 8; |
| 1281 | } |
| 1282 | v = search_struct_method (name, arg1p, args, base_offset + offset, |
| 1283 | static_memfuncp, TYPE_BASECLASS (type, i)); |
| 1284 | if (v) |
| 1285 | { |
| 1286 | /* FIXME-bothner: Why is this commented out? Why is it here? */ |
| 1287 | /* *arg1p = arg1_tmp;*/ |
| 1288 | return v; |
| 1289 | } |
| 1290 | } |
| 1291 | return NULL; |
| 1292 | } |
| 1293 | |
| 1294 | /* Given *ARGP, a value of type (pointer to a)* structure/union, |
| 1295 | extract the component named NAME from the ultimate target structure/union |
| 1296 | and return it as a value with its appropriate type. |
| 1297 | ERR is used in the error message if *ARGP's type is wrong. |
| 1298 | |
| 1299 | C++: ARGS is a list of argument types to aid in the selection of |
| 1300 | an appropriate method. Also, handle derived types. |
| 1301 | |
| 1302 | STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location |
| 1303 | where the truthvalue of whether the function that was resolved was |
| 1304 | a static member function or not is stored. |
| 1305 | |
| 1306 | ERR is an error message to be printed in case the field is not found. */ |
| 1307 | |
| 1308 | value |
| 1309 | value_struct_elt (argp, args, name, static_memfuncp, err) |
| 1310 | register value *argp, *args; |
| 1311 | char *name; |
| 1312 | int *static_memfuncp; |
| 1313 | char *err; |
| 1314 | { |
| 1315 | register struct type *t; |
| 1316 | value v; |
| 1317 | |
| 1318 | COERCE_ARRAY (*argp); |
| 1319 | |
| 1320 | t = VALUE_TYPE (*argp); |
| 1321 | |
| 1322 | /* Follow pointers until we get to a non-pointer. */ |
| 1323 | |
| 1324 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF) |
| 1325 | { |
| 1326 | *argp = value_ind (*argp); |
| 1327 | /* Don't coerce fn pointer to fn and then back again! */ |
| 1328 | if (TYPE_CODE (VALUE_TYPE (*argp)) != TYPE_CODE_FUNC) |
| 1329 | COERCE_ARRAY (*argp); |
| 1330 | t = VALUE_TYPE (*argp); |
| 1331 | } |
| 1332 | |
| 1333 | if (TYPE_CODE (t) == TYPE_CODE_MEMBER) |
| 1334 | error ("not implemented: member type in value_struct_elt"); |
| 1335 | |
| 1336 | if ( TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 1337 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 1338 | error ("Attempt to extract a component of a value that is not a %s.", err); |
| 1339 | |
| 1340 | /* Assume it's not, unless we see that it is. */ |
| 1341 | if (static_memfuncp) |
| 1342 | *static_memfuncp =0; |
| 1343 | |
| 1344 | if (!args) |
| 1345 | { |
| 1346 | /* if there are no arguments ...do this... */ |
| 1347 | |
| 1348 | /* Try as a field first, because if we succeed, there |
| 1349 | is less work to be done. */ |
| 1350 | v = search_struct_field (name, *argp, 0, t, 0); |
| 1351 | if (v) |
| 1352 | return v; |
| 1353 | |
| 1354 | /* C++: If it was not found as a data field, then try to |
| 1355 | return it as a pointer to a method. */ |
| 1356 | |
| 1357 | if (destructor_name_p (name, t)) |
| 1358 | error ("Cannot get value of destructor"); |
| 1359 | |
| 1360 | v = search_struct_method (name, argp, args, 0, static_memfuncp, t); |
| 1361 | |
| 1362 | if (v == 0) |
| 1363 | { |
| 1364 | if (TYPE_NFN_FIELDS (t)) |
| 1365 | error ("There is no member or method named %s.", name); |
| 1366 | else |
| 1367 | error ("There is no member named %s.", name); |
| 1368 | } |
| 1369 | return v; |
| 1370 | } |
| 1371 | |
| 1372 | if (destructor_name_p (name, t)) |
| 1373 | { |
| 1374 | if (!args[1]) |
| 1375 | { |
| 1376 | /* destructors are a special case. */ |
| 1377 | return (value)value_fn_field (NULL, TYPE_FN_FIELDLIST1 (t, 0), |
| 1378 | TYPE_FN_FIELDLIST_LENGTH (t, 0), |
| 1379 | 0, 0); |
| 1380 | } |
| 1381 | else |
| 1382 | { |
| 1383 | error ("destructor should not have any argument"); |
| 1384 | } |
| 1385 | } |
| 1386 | else |
| 1387 | v = search_struct_method (name, argp, args, 0, static_memfuncp, t); |
| 1388 | |
| 1389 | if (v == 0) |
| 1390 | { |
| 1391 | /* See if user tried to invoke data as function. If so, |
| 1392 | hand it back. If it's not callable (i.e., a pointer to function), |
| 1393 | gdb should give an error. */ |
| 1394 | v = search_struct_field (name, *argp, 0, t, 0); |
| 1395 | } |
| 1396 | |
| 1397 | if (!v) |
| 1398 | error ("Structure has no component named %s.", name); |
| 1399 | return v; |
| 1400 | } |
| 1401 | |
| 1402 | /* C++: return 1 is NAME is a legitimate name for the destructor |
| 1403 | of type TYPE. If TYPE does not have a destructor, or |
| 1404 | if NAME is inappropriate for TYPE, an error is signaled. */ |
| 1405 | int |
| 1406 | destructor_name_p (name, type) |
| 1407 | const char *name; |
| 1408 | const struct type *type; |
| 1409 | { |
| 1410 | /* destructors are a special case. */ |
| 1411 | |
| 1412 | if (name[0] == '~') |
| 1413 | { |
| 1414 | char *dname = type_name_no_tag (type); |
| 1415 | if (!STREQ (dname, name+1)) |
| 1416 | error ("name of destructor must equal name of class"); |
| 1417 | else |
| 1418 | return 1; |
| 1419 | } |
| 1420 | return 0; |
| 1421 | } |
| 1422 | |
| 1423 | /* Helper function for check_field: Given TYPE, a structure/union, |
| 1424 | return 1 if the component named NAME from the ultimate |
| 1425 | target structure/union is defined, otherwise, return 0. */ |
| 1426 | |
| 1427 | static int |
| 1428 | check_field_in (type, name) |
| 1429 | register struct type *type; |
| 1430 | const char *name; |
| 1431 | { |
| 1432 | register int i; |
| 1433 | |
| 1434 | for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--) |
| 1435 | { |
| 1436 | char *t_field_name = TYPE_FIELD_NAME (type, i); |
| 1437 | if (t_field_name && STREQ (t_field_name, name)) |
| 1438 | return 1; |
| 1439 | } |
| 1440 | |
| 1441 | /* C++: If it was not found as a data field, then try to |
| 1442 | return it as a pointer to a method. */ |
| 1443 | |
| 1444 | /* Destructors are a special case. */ |
| 1445 | if (destructor_name_p (name, type)) |
| 1446 | return 1; |
| 1447 | |
| 1448 | for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i) |
| 1449 | { |
| 1450 | if (STREQ (TYPE_FN_FIELDLIST_NAME (type, i), name)) |
| 1451 | return 1; |
| 1452 | } |
| 1453 | |
| 1454 | for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--) |
| 1455 | if (check_field_in (TYPE_BASECLASS (type, i), name)) |
| 1456 | return 1; |
| 1457 | |
| 1458 | return 0; |
| 1459 | } |
| 1460 | |
| 1461 | |
| 1462 | /* C++: Given ARG1, a value of type (pointer to a)* structure/union, |
| 1463 | return 1 if the component named NAME from the ultimate |
| 1464 | target structure/union is defined, otherwise, return 0. */ |
| 1465 | |
| 1466 | int |
| 1467 | check_field (arg1, name) |
| 1468 | register value arg1; |
| 1469 | const char *name; |
| 1470 | { |
| 1471 | register struct type *t; |
| 1472 | |
| 1473 | COERCE_ARRAY (arg1); |
| 1474 | |
| 1475 | t = VALUE_TYPE (arg1); |
| 1476 | |
| 1477 | /* Follow pointers until we get to a non-pointer. */ |
| 1478 | |
| 1479 | while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF) |
| 1480 | t = TYPE_TARGET_TYPE (t); |
| 1481 | |
| 1482 | if (TYPE_CODE (t) == TYPE_CODE_MEMBER) |
| 1483 | error ("not implemented: member type in check_field"); |
| 1484 | |
| 1485 | if ( TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 1486 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 1487 | error ("Internal error: `this' is not an aggregate"); |
| 1488 | |
| 1489 | return check_field_in (t, name); |
| 1490 | } |
| 1491 | |
| 1492 | /* C++: Given an aggregate type CURTYPE, and a member name NAME, |
| 1493 | return the address of this member as a "pointer to member" |
| 1494 | type. If INTYPE is non-null, then it will be the type |
| 1495 | of the member we are looking for. This will help us resolve |
| 1496 | "pointers to member functions". This function is used |
| 1497 | to resolve user expressions of the form "DOMAIN::NAME". */ |
| 1498 | |
| 1499 | value |
| 1500 | value_struct_elt_for_reference (domain, offset, curtype, name, intype) |
| 1501 | struct type *domain, *curtype, *intype; |
| 1502 | int offset; |
| 1503 | char *name; |
| 1504 | { |
| 1505 | register struct type *t = curtype; |
| 1506 | register int i; |
| 1507 | value v; |
| 1508 | |
| 1509 | if ( TYPE_CODE (t) != TYPE_CODE_STRUCT |
| 1510 | && TYPE_CODE (t) != TYPE_CODE_UNION) |
| 1511 | error ("Internal error: non-aggregate type to value_struct_elt_for_reference"); |
| 1512 | |
| 1513 | for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--) |
| 1514 | { |
| 1515 | char *t_field_name = TYPE_FIELD_NAME (t, i); |
| 1516 | |
| 1517 | if (t_field_name && STREQ (t_field_name, name)) |
| 1518 | { |
| 1519 | if (TYPE_FIELD_STATIC (t, i)) |
| 1520 | { |
| 1521 | char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (t, i); |
| 1522 | struct symbol *sym = |
| 1523 | lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL); |
| 1524 | if (sym == NULL) |
| 1525 | error ("Internal error: could not find physical static variable named %s", |
| 1526 | phys_name); |
| 1527 | return value_at (SYMBOL_TYPE (sym), |
| 1528 | (CORE_ADDR)SYMBOL_BLOCK_VALUE (sym)); |
| 1529 | } |
| 1530 | if (TYPE_FIELD_PACKED (t, i)) |
| 1531 | error ("pointers to bitfield members not allowed"); |
| 1532 | |
| 1533 | return value_from_longest |
| 1534 | (lookup_reference_type (lookup_member_type (TYPE_FIELD_TYPE (t, i), |
| 1535 | domain)), |
| 1536 | offset + (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3)); |
| 1537 | } |
| 1538 | } |
| 1539 | |
| 1540 | /* C++: If it was not found as a data field, then try to |
| 1541 | return it as a pointer to a method. */ |
| 1542 | |
| 1543 | /* Destructors are a special case. */ |
| 1544 | if (destructor_name_p (name, t)) |
| 1545 | { |
| 1546 | error ("member pointers to destructors not implemented yet"); |
| 1547 | } |
| 1548 | |
| 1549 | /* Perform all necessary dereferencing. */ |
| 1550 | while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR) |
| 1551 | intype = TYPE_TARGET_TYPE (intype); |
| 1552 | |
| 1553 | for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i) |
| 1554 | { |
| 1555 | if (STREQ (TYPE_FN_FIELDLIST_NAME (t, i), name)) |
| 1556 | { |
| 1557 | int j = TYPE_FN_FIELDLIST_LENGTH (t, i); |
| 1558 | struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i); |
| 1559 | |
| 1560 | if (intype == 0 && j > 1) |
| 1561 | error ("non-unique member `%s' requires type instantiation", name); |
| 1562 | if (intype) |
| 1563 | { |
| 1564 | while (j--) |
| 1565 | if (TYPE_FN_FIELD_TYPE (f, j) == intype) |
| 1566 | break; |
| 1567 | if (j < 0) |
| 1568 | error ("no member function matches that type instantiation"); |
| 1569 | } |
| 1570 | else |
| 1571 | j = 0; |
| 1572 | |
| 1573 | if (TYPE_FN_FIELD_STUB (f, j)) |
| 1574 | check_stub_method (t, i, j); |
| 1575 | if (TYPE_FN_FIELD_VIRTUAL_P (f, j)) |
| 1576 | { |
| 1577 | return value_from_longest |
| 1578 | (lookup_reference_type |
| 1579 | (lookup_member_type (TYPE_FN_FIELD_TYPE (f, j), |
| 1580 | domain)), |
| 1581 | (LONGEST) METHOD_PTR_FROM_VOFFSET |
| 1582 | (TYPE_FN_FIELD_VOFFSET (f, j))); |
| 1583 | } |
| 1584 | else |
| 1585 | { |
| 1586 | struct symbol *s = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j), |
| 1587 | 0, VAR_NAMESPACE, 0, NULL); |
| 1588 | if (s == NULL) |
| 1589 | { |
| 1590 | v = 0; |
| 1591 | } |
| 1592 | else |
| 1593 | { |
| 1594 | v = read_var_value (s, 0); |
| 1595 | #if 0 |
| 1596 | VALUE_TYPE (v) = lookup_reference_type |
| 1597 | (lookup_member_type (TYPE_FN_FIELD_TYPE (f, j), |
| 1598 | domain)); |
| 1599 | #endif |
| 1600 | } |
| 1601 | return v; |
| 1602 | } |
| 1603 | } |
| 1604 | } |
| 1605 | for (i = TYPE_N_BASECLASSES (t) - 1; i >= 0; i--) |
| 1606 | { |
| 1607 | value v; |
| 1608 | int base_offset; |
| 1609 | |
| 1610 | if (BASETYPE_VIA_VIRTUAL (t, i)) |
| 1611 | base_offset = 0; |
| 1612 | else |
| 1613 | base_offset = TYPE_BASECLASS_BITPOS (t, i) / 8; |
| 1614 | v = value_struct_elt_for_reference (domain, |
| 1615 | offset + base_offset, |
| 1616 | TYPE_BASECLASS (t, i), |
| 1617 | name, |
| 1618 | intype); |
| 1619 | if (v) |
| 1620 | return v; |
| 1621 | } |
| 1622 | return 0; |
| 1623 | } |
| 1624 | |
| 1625 | /* C++: return the value of the class instance variable, if one exists. |
| 1626 | Flag COMPLAIN signals an error if the request is made in an |
| 1627 | inappropriate context. */ |
| 1628 | value |
| 1629 | value_of_this (complain) |
| 1630 | int complain; |
| 1631 | { |
| 1632 | extern FRAME selected_frame; |
| 1633 | struct symbol *func, *sym; |
| 1634 | struct block *b; |
| 1635 | int i; |
| 1636 | static const char funny_this[] = "this"; |
| 1637 | value this; |
| 1638 | |
| 1639 | if (selected_frame == 0) |
| 1640 | if (complain) |
| 1641 | error ("no frame selected"); |
| 1642 | else return 0; |
| 1643 | |
| 1644 | func = get_frame_function (selected_frame); |
| 1645 | if (!func) |
| 1646 | { |
| 1647 | if (complain) |
| 1648 | error ("no `this' in nameless context"); |
| 1649 | else return 0; |
| 1650 | } |
| 1651 | |
| 1652 | b = SYMBOL_BLOCK_VALUE (func); |
| 1653 | i = BLOCK_NSYMS (b); |
| 1654 | if (i <= 0) |
| 1655 | if (complain) |
| 1656 | error ("no args, no `this'"); |
| 1657 | else return 0; |
| 1658 | |
| 1659 | /* Calling lookup_block_symbol is necessary to get the LOC_REGISTER |
| 1660 | symbol instead of the LOC_ARG one (if both exist). */ |
| 1661 | sym = lookup_block_symbol (b, funny_this, VAR_NAMESPACE); |
| 1662 | if (sym == NULL) |
| 1663 | { |
| 1664 | if (complain) |
| 1665 | error ("current stack frame not in method"); |
| 1666 | else |
| 1667 | return NULL; |
| 1668 | } |
| 1669 | |
| 1670 | this = read_var_value (sym, selected_frame); |
| 1671 | if (this == 0 && complain) |
| 1672 | error ("`this' argument at unknown address"); |
| 1673 | return this; |
| 1674 | } |