| 1 | /* Evaluate expressions for GDB. |
| 2 | |
| 3 | Copyright (C) 1986-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "symtab.h" |
| 22 | #include "gdbtypes.h" |
| 23 | #include "value.h" |
| 24 | #include "expression.h" |
| 25 | #include "target.h" |
| 26 | #include "frame.h" |
| 27 | #include "gdbthread.h" |
| 28 | #include "language.h" /* For CAST_IS_CONVERSION. */ |
| 29 | #include "f-lang.h" /* For array bound stuff. */ |
| 30 | #include "cp-abi.h" |
| 31 | #include "infcall.h" |
| 32 | #include "objc-lang.h" |
| 33 | #include "block.h" |
| 34 | #include "parser-defs.h" |
| 35 | #include "cp-support.h" |
| 36 | #include "ui-out.h" |
| 37 | #include "regcache.h" |
| 38 | #include "user-regs.h" |
| 39 | #include "valprint.h" |
| 40 | #include "gdb_obstack.h" |
| 41 | #include "objfiles.h" |
| 42 | #include "typeprint.h" |
| 43 | #include <ctype.h> |
| 44 | |
| 45 | /* This is defined in valops.c */ |
| 46 | extern int overload_resolution; |
| 47 | |
| 48 | /* Prototypes for local functions. */ |
| 49 | |
| 50 | static struct value *evaluate_subexp_for_sizeof (struct expression *, int *, |
| 51 | enum noside); |
| 52 | |
| 53 | static struct value *evaluate_subexp_for_address (struct expression *, |
| 54 | int *, enum noside); |
| 55 | |
| 56 | static value *evaluate_subexp_for_cast (expression *exp, int *pos, |
| 57 | enum noside noside, |
| 58 | struct type *type); |
| 59 | |
| 60 | static struct value *evaluate_struct_tuple (struct value *, |
| 61 | struct expression *, int *, |
| 62 | enum noside, int); |
| 63 | |
| 64 | static LONGEST init_array_element (struct value *, struct value *, |
| 65 | struct expression *, int *, enum noside, |
| 66 | LONGEST, LONGEST); |
| 67 | |
| 68 | struct value * |
| 69 | evaluate_subexp (struct type *expect_type, struct expression *exp, |
| 70 | int *pos, enum noside noside) |
| 71 | { |
| 72 | struct value *retval; |
| 73 | |
| 74 | gdb::optional<enable_thread_stack_temporaries> stack_temporaries; |
| 75 | if (*pos == 0 && target_has_execution |
| 76 | && exp->language_defn->la_language == language_cplus |
| 77 | && !thread_stack_temporaries_enabled_p (inferior_ptid)) |
| 78 | stack_temporaries.emplace (inferior_ptid); |
| 79 | |
| 80 | retval = (*exp->language_defn->la_exp_desc->evaluate_exp) |
| 81 | (expect_type, exp, pos, noside); |
| 82 | |
| 83 | if (stack_temporaries.has_value () |
| 84 | && value_in_thread_stack_temporaries (retval, inferior_ptid)) |
| 85 | retval = value_non_lval (retval); |
| 86 | |
| 87 | return retval; |
| 88 | } |
| 89 | \f |
| 90 | /* Parse the string EXP as a C expression, evaluate it, |
| 91 | and return the result as a number. */ |
| 92 | |
| 93 | CORE_ADDR |
| 94 | parse_and_eval_address (const char *exp) |
| 95 | { |
| 96 | expression_up expr = parse_expression (exp); |
| 97 | |
| 98 | return value_as_address (evaluate_expression (expr.get ())); |
| 99 | } |
| 100 | |
| 101 | /* Like parse_and_eval_address, but treats the value of the expression |
| 102 | as an integer, not an address, returns a LONGEST, not a CORE_ADDR. */ |
| 103 | LONGEST |
| 104 | parse_and_eval_long (const char *exp) |
| 105 | { |
| 106 | expression_up expr = parse_expression (exp); |
| 107 | |
| 108 | return value_as_long (evaluate_expression (expr.get ())); |
| 109 | } |
| 110 | |
| 111 | struct value * |
| 112 | parse_and_eval (const char *exp) |
| 113 | { |
| 114 | expression_up expr = parse_expression (exp); |
| 115 | |
| 116 | return evaluate_expression (expr.get ()); |
| 117 | } |
| 118 | |
| 119 | /* Parse up to a comma (or to a closeparen) |
| 120 | in the string EXPP as an expression, evaluate it, and return the value. |
| 121 | EXPP is advanced to point to the comma. */ |
| 122 | |
| 123 | struct value * |
| 124 | parse_to_comma_and_eval (const char **expp) |
| 125 | { |
| 126 | expression_up expr = parse_exp_1 (expp, 0, (struct block *) 0, 1); |
| 127 | |
| 128 | return evaluate_expression (expr.get ()); |
| 129 | } |
| 130 | \f |
| 131 | /* Evaluate an expression in internal prefix form |
| 132 | such as is constructed by parse.y. |
| 133 | |
| 134 | See expression.h for info on the format of an expression. */ |
| 135 | |
| 136 | struct value * |
| 137 | evaluate_expression (struct expression *exp) |
| 138 | { |
| 139 | int pc = 0; |
| 140 | |
| 141 | return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_NORMAL); |
| 142 | } |
| 143 | |
| 144 | /* Evaluate an expression, avoiding all memory references |
| 145 | and getting a value whose type alone is correct. */ |
| 146 | |
| 147 | struct value * |
| 148 | evaluate_type (struct expression *exp) |
| 149 | { |
| 150 | int pc = 0; |
| 151 | |
| 152 | return evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS); |
| 153 | } |
| 154 | |
| 155 | /* Evaluate a subexpression, avoiding all memory references and |
| 156 | getting a value whose type alone is correct. */ |
| 157 | |
| 158 | struct value * |
| 159 | evaluate_subexpression_type (struct expression *exp, int subexp) |
| 160 | { |
| 161 | return evaluate_subexp (NULL_TYPE, exp, &subexp, EVAL_AVOID_SIDE_EFFECTS); |
| 162 | } |
| 163 | |
| 164 | /* Find the current value of a watchpoint on EXP. Return the value in |
| 165 | *VALP and *RESULTP and the chain of intermediate and final values |
| 166 | in *VAL_CHAIN. RESULTP and VAL_CHAIN may be NULL if the caller does |
| 167 | not need them. |
| 168 | |
| 169 | If PRESERVE_ERRORS is true, then exceptions are passed through. |
| 170 | Otherwise, if PRESERVE_ERRORS is false, then if a memory error |
| 171 | occurs while evaluating the expression, *RESULTP will be set to |
| 172 | NULL. *RESULTP may be a lazy value, if the result could not be |
| 173 | read from memory. It is used to determine whether a value is |
| 174 | user-specified (we should watch the whole value) or intermediate |
| 175 | (we should watch only the bit used to locate the final value). |
| 176 | |
| 177 | If the final value, or any intermediate value, could not be read |
| 178 | from memory, *VALP will be set to NULL. *VAL_CHAIN will still be |
| 179 | set to any referenced values. *VALP will never be a lazy value. |
| 180 | This is the value which we store in struct breakpoint. |
| 181 | |
| 182 | If VAL_CHAIN is non-NULL, the values put into *VAL_CHAIN will be |
| 183 | released from the value chain. If VAL_CHAIN is NULL, all generated |
| 184 | values will be left on the value chain. */ |
| 185 | |
| 186 | void |
| 187 | fetch_subexp_value (struct expression *exp, int *pc, struct value **valp, |
| 188 | struct value **resultp, |
| 189 | std::vector<value_ref_ptr> *val_chain, |
| 190 | int preserve_errors) |
| 191 | { |
| 192 | struct value *mark, *new_mark, *result; |
| 193 | |
| 194 | *valp = NULL; |
| 195 | if (resultp) |
| 196 | *resultp = NULL; |
| 197 | if (val_chain) |
| 198 | val_chain->clear (); |
| 199 | |
| 200 | /* Evaluate the expression. */ |
| 201 | mark = value_mark (); |
| 202 | result = NULL; |
| 203 | |
| 204 | TRY |
| 205 | { |
| 206 | result = evaluate_subexp (NULL_TYPE, exp, pc, EVAL_NORMAL); |
| 207 | } |
| 208 | CATCH (ex, RETURN_MASK_ALL) |
| 209 | { |
| 210 | /* Ignore memory errors if we want watchpoints pointing at |
| 211 | inaccessible memory to still be created; otherwise, throw the |
| 212 | error to some higher catcher. */ |
| 213 | switch (ex.error) |
| 214 | { |
| 215 | case MEMORY_ERROR: |
| 216 | if (!preserve_errors) |
| 217 | break; |
| 218 | /* Fall through. */ |
| 219 | default: |
| 220 | throw_exception (ex); |
| 221 | break; |
| 222 | } |
| 223 | } |
| 224 | END_CATCH |
| 225 | |
| 226 | new_mark = value_mark (); |
| 227 | if (mark == new_mark) |
| 228 | return; |
| 229 | if (resultp) |
| 230 | *resultp = result; |
| 231 | |
| 232 | /* Make sure it's not lazy, so that after the target stops again we |
| 233 | have a non-lazy previous value to compare with. */ |
| 234 | if (result != NULL) |
| 235 | { |
| 236 | if (!value_lazy (result)) |
| 237 | *valp = result; |
| 238 | else |
| 239 | { |
| 240 | |
| 241 | TRY |
| 242 | { |
| 243 | value_fetch_lazy (result); |
| 244 | *valp = result; |
| 245 | } |
| 246 | CATCH (except, RETURN_MASK_ERROR) |
| 247 | { |
| 248 | } |
| 249 | END_CATCH |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | if (val_chain) |
| 254 | { |
| 255 | /* Return the chain of intermediate values. We use this to |
| 256 | decide which addresses to watch. */ |
| 257 | *val_chain = value_release_to_mark (mark); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | /* Extract a field operation from an expression. If the subexpression |
| 262 | of EXP starting at *SUBEXP is not a structure dereference |
| 263 | operation, return NULL. Otherwise, return the name of the |
| 264 | dereferenced field, and advance *SUBEXP to point to the |
| 265 | subexpression of the left-hand-side of the dereference. This is |
| 266 | used when completing field names. */ |
| 267 | |
| 268 | const char * |
| 269 | extract_field_op (struct expression *exp, int *subexp) |
| 270 | { |
| 271 | int tem; |
| 272 | char *result; |
| 273 | |
| 274 | if (exp->elts[*subexp].opcode != STRUCTOP_STRUCT |
| 275 | && exp->elts[*subexp].opcode != STRUCTOP_PTR) |
| 276 | return NULL; |
| 277 | tem = longest_to_int (exp->elts[*subexp + 1].longconst); |
| 278 | result = &exp->elts[*subexp + 2].string; |
| 279 | (*subexp) += 1 + 3 + BYTES_TO_EXP_ELEM (tem + 1); |
| 280 | return result; |
| 281 | } |
| 282 | |
| 283 | /* This function evaluates brace-initializers (in C/C++) for |
| 284 | structure types. */ |
| 285 | |
| 286 | static struct value * |
| 287 | evaluate_struct_tuple (struct value *struct_val, |
| 288 | struct expression *exp, |
| 289 | int *pos, enum noside noside, int nargs) |
| 290 | { |
| 291 | struct type *struct_type = check_typedef (value_type (struct_val)); |
| 292 | struct type *field_type; |
| 293 | int fieldno = -1; |
| 294 | |
| 295 | while (--nargs >= 0) |
| 296 | { |
| 297 | struct value *val = NULL; |
| 298 | int bitpos, bitsize; |
| 299 | bfd_byte *addr; |
| 300 | |
| 301 | fieldno++; |
| 302 | /* Skip static fields. */ |
| 303 | while (fieldno < TYPE_NFIELDS (struct_type) |
| 304 | && field_is_static (&TYPE_FIELD (struct_type, |
| 305 | fieldno))) |
| 306 | fieldno++; |
| 307 | if (fieldno >= TYPE_NFIELDS (struct_type)) |
| 308 | error (_("too many initializers")); |
| 309 | field_type = TYPE_FIELD_TYPE (struct_type, fieldno); |
| 310 | if (TYPE_CODE (field_type) == TYPE_CODE_UNION |
| 311 | && TYPE_FIELD_NAME (struct_type, fieldno)[0] == '0') |
| 312 | error (_("don't know which variant you want to set")); |
| 313 | |
| 314 | /* Here, struct_type is the type of the inner struct, |
| 315 | while substruct_type is the type of the inner struct. |
| 316 | These are the same for normal structures, but a variant struct |
| 317 | contains anonymous union fields that contain substruct fields. |
| 318 | The value fieldno is the index of the top-level (normal or |
| 319 | anonymous union) field in struct_field, while the value |
| 320 | subfieldno is the index of the actual real (named inner) field |
| 321 | in substruct_type. */ |
| 322 | |
| 323 | field_type = TYPE_FIELD_TYPE (struct_type, fieldno); |
| 324 | if (val == 0) |
| 325 | val = evaluate_subexp (field_type, exp, pos, noside); |
| 326 | |
| 327 | /* Now actually set the field in struct_val. */ |
| 328 | |
| 329 | /* Assign val to field fieldno. */ |
| 330 | if (value_type (val) != field_type) |
| 331 | val = value_cast (field_type, val); |
| 332 | |
| 333 | bitsize = TYPE_FIELD_BITSIZE (struct_type, fieldno); |
| 334 | bitpos = TYPE_FIELD_BITPOS (struct_type, fieldno); |
| 335 | addr = value_contents_writeable (struct_val) + bitpos / 8; |
| 336 | if (bitsize) |
| 337 | modify_field (struct_type, addr, |
| 338 | value_as_long (val), bitpos % 8, bitsize); |
| 339 | else |
| 340 | memcpy (addr, value_contents (val), |
| 341 | TYPE_LENGTH (value_type (val))); |
| 342 | |
| 343 | } |
| 344 | return struct_val; |
| 345 | } |
| 346 | |
| 347 | /* Recursive helper function for setting elements of array tuples. |
| 348 | The target is ARRAY (which has bounds LOW_BOUND to HIGH_BOUND); the |
| 349 | element value is ELEMENT; EXP, POS and NOSIDE are as usual. |
| 350 | Evaluates index expresions and sets the specified element(s) of |
| 351 | ARRAY to ELEMENT. Returns last index value. */ |
| 352 | |
| 353 | static LONGEST |
| 354 | init_array_element (struct value *array, struct value *element, |
| 355 | struct expression *exp, int *pos, |
| 356 | enum noside noside, LONGEST low_bound, LONGEST high_bound) |
| 357 | { |
| 358 | LONGEST index; |
| 359 | int element_size = TYPE_LENGTH (value_type (element)); |
| 360 | |
| 361 | if (exp->elts[*pos].opcode == BINOP_COMMA) |
| 362 | { |
| 363 | (*pos)++; |
| 364 | init_array_element (array, element, exp, pos, noside, |
| 365 | low_bound, high_bound); |
| 366 | return init_array_element (array, element, |
| 367 | exp, pos, noside, low_bound, high_bound); |
| 368 | } |
| 369 | else |
| 370 | { |
| 371 | index = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); |
| 372 | if (index < low_bound || index > high_bound) |
| 373 | error (_("tuple index out of range")); |
| 374 | memcpy (value_contents_raw (array) + (index - low_bound) * element_size, |
| 375 | value_contents (element), element_size); |
| 376 | } |
| 377 | return index; |
| 378 | } |
| 379 | |
| 380 | static struct value * |
| 381 | value_f90_subarray (struct value *array, |
| 382 | struct expression *exp, int *pos, enum noside noside) |
| 383 | { |
| 384 | int pc = (*pos) + 1; |
| 385 | LONGEST low_bound, high_bound; |
| 386 | struct type *range = check_typedef (TYPE_INDEX_TYPE (value_type (array))); |
| 387 | enum range_type range_type |
| 388 | = (enum range_type) longest_to_int (exp->elts[pc].longconst); |
| 389 | |
| 390 | *pos += 3; |
| 391 | |
| 392 | if (range_type == LOW_BOUND_DEFAULT || range_type == BOTH_BOUND_DEFAULT) |
| 393 | low_bound = TYPE_LOW_BOUND (range); |
| 394 | else |
| 395 | low_bound = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); |
| 396 | |
| 397 | if (range_type == HIGH_BOUND_DEFAULT || range_type == BOTH_BOUND_DEFAULT) |
| 398 | high_bound = TYPE_HIGH_BOUND (range); |
| 399 | else |
| 400 | high_bound = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); |
| 401 | |
| 402 | return value_slice (array, low_bound, high_bound - low_bound + 1); |
| 403 | } |
| 404 | |
| 405 | |
| 406 | /* Promote value ARG1 as appropriate before performing a unary operation |
| 407 | on this argument. |
| 408 | If the result is not appropriate for any particular language then it |
| 409 | needs to patch this function. */ |
| 410 | |
| 411 | void |
| 412 | unop_promote (const struct language_defn *language, struct gdbarch *gdbarch, |
| 413 | struct value **arg1) |
| 414 | { |
| 415 | struct type *type1; |
| 416 | |
| 417 | *arg1 = coerce_ref (*arg1); |
| 418 | type1 = check_typedef (value_type (*arg1)); |
| 419 | |
| 420 | if (is_integral_type (type1)) |
| 421 | { |
| 422 | switch (language->la_language) |
| 423 | { |
| 424 | default: |
| 425 | /* Perform integral promotion for ANSI C/C++. |
| 426 | If not appropropriate for any particular language |
| 427 | it needs to modify this function. */ |
| 428 | { |
| 429 | struct type *builtin_int = builtin_type (gdbarch)->builtin_int; |
| 430 | |
| 431 | if (TYPE_LENGTH (type1) < TYPE_LENGTH (builtin_int)) |
| 432 | *arg1 = value_cast (builtin_int, *arg1); |
| 433 | } |
| 434 | break; |
| 435 | } |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | /* Promote values ARG1 and ARG2 as appropriate before performing a binary |
| 440 | operation on those two operands. |
| 441 | If the result is not appropriate for any particular language then it |
| 442 | needs to patch this function. */ |
| 443 | |
| 444 | void |
| 445 | binop_promote (const struct language_defn *language, struct gdbarch *gdbarch, |
| 446 | struct value **arg1, struct value **arg2) |
| 447 | { |
| 448 | struct type *promoted_type = NULL; |
| 449 | struct type *type1; |
| 450 | struct type *type2; |
| 451 | |
| 452 | *arg1 = coerce_ref (*arg1); |
| 453 | *arg2 = coerce_ref (*arg2); |
| 454 | |
| 455 | type1 = check_typedef (value_type (*arg1)); |
| 456 | type2 = check_typedef (value_type (*arg2)); |
| 457 | |
| 458 | if ((TYPE_CODE (type1) != TYPE_CODE_FLT |
| 459 | && TYPE_CODE (type1) != TYPE_CODE_DECFLOAT |
| 460 | && !is_integral_type (type1)) |
| 461 | || (TYPE_CODE (type2) != TYPE_CODE_FLT |
| 462 | && TYPE_CODE (type2) != TYPE_CODE_DECFLOAT |
| 463 | && !is_integral_type (type2))) |
| 464 | return; |
| 465 | |
| 466 | if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT |
| 467 | || TYPE_CODE (type2) == TYPE_CODE_DECFLOAT) |
| 468 | { |
| 469 | /* No promotion required. */ |
| 470 | } |
| 471 | else if (TYPE_CODE (type1) == TYPE_CODE_FLT |
| 472 | || TYPE_CODE (type2) == TYPE_CODE_FLT) |
| 473 | { |
| 474 | switch (language->la_language) |
| 475 | { |
| 476 | case language_c: |
| 477 | case language_cplus: |
| 478 | case language_asm: |
| 479 | case language_objc: |
| 480 | case language_opencl: |
| 481 | /* No promotion required. */ |
| 482 | break; |
| 483 | |
| 484 | default: |
| 485 | /* For other languages the result type is unchanged from gdb |
| 486 | version 6.7 for backward compatibility. |
| 487 | If either arg was long double, make sure that value is also long |
| 488 | double. Otherwise use double. */ |
| 489 | if (TYPE_LENGTH (type1) * 8 > gdbarch_double_bit (gdbarch) |
| 490 | || TYPE_LENGTH (type2) * 8 > gdbarch_double_bit (gdbarch)) |
| 491 | promoted_type = builtin_type (gdbarch)->builtin_long_double; |
| 492 | else |
| 493 | promoted_type = builtin_type (gdbarch)->builtin_double; |
| 494 | break; |
| 495 | } |
| 496 | } |
| 497 | else if (TYPE_CODE (type1) == TYPE_CODE_BOOL |
| 498 | && TYPE_CODE (type2) == TYPE_CODE_BOOL) |
| 499 | { |
| 500 | /* No promotion required. */ |
| 501 | } |
| 502 | else |
| 503 | /* Integral operations here. */ |
| 504 | /* FIXME: Also mixed integral/booleans, with result an integer. */ |
| 505 | { |
| 506 | const struct builtin_type *builtin = builtin_type (gdbarch); |
| 507 | unsigned int promoted_len1 = TYPE_LENGTH (type1); |
| 508 | unsigned int promoted_len2 = TYPE_LENGTH (type2); |
| 509 | int is_unsigned1 = TYPE_UNSIGNED (type1); |
| 510 | int is_unsigned2 = TYPE_UNSIGNED (type2); |
| 511 | unsigned int result_len; |
| 512 | int unsigned_operation; |
| 513 | |
| 514 | /* Determine type length and signedness after promotion for |
| 515 | both operands. */ |
| 516 | if (promoted_len1 < TYPE_LENGTH (builtin->builtin_int)) |
| 517 | { |
| 518 | is_unsigned1 = 0; |
| 519 | promoted_len1 = TYPE_LENGTH (builtin->builtin_int); |
| 520 | } |
| 521 | if (promoted_len2 < TYPE_LENGTH (builtin->builtin_int)) |
| 522 | { |
| 523 | is_unsigned2 = 0; |
| 524 | promoted_len2 = TYPE_LENGTH (builtin->builtin_int); |
| 525 | } |
| 526 | |
| 527 | if (promoted_len1 > promoted_len2) |
| 528 | { |
| 529 | unsigned_operation = is_unsigned1; |
| 530 | result_len = promoted_len1; |
| 531 | } |
| 532 | else if (promoted_len2 > promoted_len1) |
| 533 | { |
| 534 | unsigned_operation = is_unsigned2; |
| 535 | result_len = promoted_len2; |
| 536 | } |
| 537 | else |
| 538 | { |
| 539 | unsigned_operation = is_unsigned1 || is_unsigned2; |
| 540 | result_len = promoted_len1; |
| 541 | } |
| 542 | |
| 543 | switch (language->la_language) |
| 544 | { |
| 545 | case language_c: |
| 546 | case language_cplus: |
| 547 | case language_asm: |
| 548 | case language_objc: |
| 549 | if (result_len <= TYPE_LENGTH (builtin->builtin_int)) |
| 550 | { |
| 551 | promoted_type = (unsigned_operation |
| 552 | ? builtin->builtin_unsigned_int |
| 553 | : builtin->builtin_int); |
| 554 | } |
| 555 | else if (result_len <= TYPE_LENGTH (builtin->builtin_long)) |
| 556 | { |
| 557 | promoted_type = (unsigned_operation |
| 558 | ? builtin->builtin_unsigned_long |
| 559 | : builtin->builtin_long); |
| 560 | } |
| 561 | else |
| 562 | { |
| 563 | promoted_type = (unsigned_operation |
| 564 | ? builtin->builtin_unsigned_long_long |
| 565 | : builtin->builtin_long_long); |
| 566 | } |
| 567 | break; |
| 568 | case language_opencl: |
| 569 | if (result_len <= TYPE_LENGTH (lookup_signed_typename |
| 570 | (language, gdbarch, "int"))) |
| 571 | { |
| 572 | promoted_type = |
| 573 | (unsigned_operation |
| 574 | ? lookup_unsigned_typename (language, gdbarch, "int") |
| 575 | : lookup_signed_typename (language, gdbarch, "int")); |
| 576 | } |
| 577 | else if (result_len <= TYPE_LENGTH (lookup_signed_typename |
| 578 | (language, gdbarch, "long"))) |
| 579 | { |
| 580 | promoted_type = |
| 581 | (unsigned_operation |
| 582 | ? lookup_unsigned_typename (language, gdbarch, "long") |
| 583 | : lookup_signed_typename (language, gdbarch,"long")); |
| 584 | } |
| 585 | break; |
| 586 | default: |
| 587 | /* For other languages the result type is unchanged from gdb |
| 588 | version 6.7 for backward compatibility. |
| 589 | If either arg was long long, make sure that value is also long |
| 590 | long. Otherwise use long. */ |
| 591 | if (unsigned_operation) |
| 592 | { |
| 593 | if (result_len > gdbarch_long_bit (gdbarch) / HOST_CHAR_BIT) |
| 594 | promoted_type = builtin->builtin_unsigned_long_long; |
| 595 | else |
| 596 | promoted_type = builtin->builtin_unsigned_long; |
| 597 | } |
| 598 | else |
| 599 | { |
| 600 | if (result_len > gdbarch_long_bit (gdbarch) / HOST_CHAR_BIT) |
| 601 | promoted_type = builtin->builtin_long_long; |
| 602 | else |
| 603 | promoted_type = builtin->builtin_long; |
| 604 | } |
| 605 | break; |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | if (promoted_type) |
| 610 | { |
| 611 | /* Promote both operands to common type. */ |
| 612 | *arg1 = value_cast (promoted_type, *arg1); |
| 613 | *arg2 = value_cast (promoted_type, *arg2); |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | static int |
| 618 | ptrmath_type_p (const struct language_defn *lang, struct type *type) |
| 619 | { |
| 620 | type = check_typedef (type); |
| 621 | if (TYPE_IS_REFERENCE (type)) |
| 622 | type = TYPE_TARGET_TYPE (type); |
| 623 | |
| 624 | switch (TYPE_CODE (type)) |
| 625 | { |
| 626 | case TYPE_CODE_PTR: |
| 627 | case TYPE_CODE_FUNC: |
| 628 | return 1; |
| 629 | |
| 630 | case TYPE_CODE_ARRAY: |
| 631 | return TYPE_VECTOR (type) ? 0 : lang->c_style_arrays; |
| 632 | |
| 633 | default: |
| 634 | return 0; |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | /* Represents a fake method with the given parameter types. This is |
| 639 | used by the parser to construct a temporary "expected" type for |
| 640 | method overload resolution. FLAGS is used as instance flags of the |
| 641 | new type, in order to be able to make the new type represent a |
| 642 | const/volatile overload. */ |
| 643 | |
| 644 | class fake_method |
| 645 | { |
| 646 | public: |
| 647 | fake_method (type_instance_flags flags, |
| 648 | int num_types, struct type **param_types); |
| 649 | ~fake_method (); |
| 650 | |
| 651 | /* The constructed type. */ |
| 652 | struct type *type () { return &m_type; } |
| 653 | |
| 654 | private: |
| 655 | struct type m_type {}; |
| 656 | main_type m_main_type {}; |
| 657 | }; |
| 658 | |
| 659 | fake_method::fake_method (type_instance_flags flags, |
| 660 | int num_types, struct type **param_types) |
| 661 | { |
| 662 | struct type *type = &m_type; |
| 663 | |
| 664 | TYPE_MAIN_TYPE (type) = &m_main_type; |
| 665 | TYPE_LENGTH (type) = 1; |
| 666 | TYPE_CODE (type) = TYPE_CODE_METHOD; |
| 667 | TYPE_CHAIN (type) = type; |
| 668 | TYPE_INSTANCE_FLAGS (type) = flags; |
| 669 | if (num_types > 0) |
| 670 | { |
| 671 | if (param_types[num_types - 1] == NULL) |
| 672 | { |
| 673 | --num_types; |
| 674 | TYPE_VARARGS (type) = 1; |
| 675 | } |
| 676 | else if (TYPE_CODE (check_typedef (param_types[num_types - 1])) |
| 677 | == TYPE_CODE_VOID) |
| 678 | { |
| 679 | --num_types; |
| 680 | /* Caller should have ensured this. */ |
| 681 | gdb_assert (num_types == 0); |
| 682 | TYPE_PROTOTYPED (type) = 1; |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | TYPE_NFIELDS (type) = num_types; |
| 687 | TYPE_FIELDS (type) = (struct field *) |
| 688 | TYPE_ZALLOC (type, sizeof (struct field) * num_types); |
| 689 | |
| 690 | while (num_types-- > 0) |
| 691 | TYPE_FIELD_TYPE (type, num_types) = param_types[num_types]; |
| 692 | } |
| 693 | |
| 694 | fake_method::~fake_method () |
| 695 | { |
| 696 | xfree (TYPE_FIELDS (&m_type)); |
| 697 | } |
| 698 | |
| 699 | /* Helper for evaluating an OP_VAR_VALUE. */ |
| 700 | |
| 701 | value * |
| 702 | evaluate_var_value (enum noside noside, const block *blk, symbol *var) |
| 703 | { |
| 704 | /* JYG: We used to just return value_zero of the symbol type if |
| 705 | we're asked to avoid side effects. Otherwise we return |
| 706 | value_of_variable (...). However I'm not sure if |
| 707 | value_of_variable () has any side effect. We need a full value |
| 708 | object returned here for whatis_exp () to call evaluate_type () |
| 709 | and then pass the full value to value_rtti_target_type () if we |
| 710 | are dealing with a pointer or reference to a base class and print |
| 711 | object is on. */ |
| 712 | |
| 713 | struct value *ret = NULL; |
| 714 | |
| 715 | TRY |
| 716 | { |
| 717 | ret = value_of_variable (var, blk); |
| 718 | } |
| 719 | |
| 720 | CATCH (except, RETURN_MASK_ERROR) |
| 721 | { |
| 722 | if (noside != EVAL_AVOID_SIDE_EFFECTS) |
| 723 | throw_exception (except); |
| 724 | |
| 725 | ret = value_zero (SYMBOL_TYPE (var), not_lval); |
| 726 | } |
| 727 | END_CATCH |
| 728 | |
| 729 | return ret; |
| 730 | } |
| 731 | |
| 732 | /* Helper for evaluating an OP_VAR_MSYM_VALUE. */ |
| 733 | |
| 734 | value * |
| 735 | evaluate_var_msym_value (enum noside noside, |
| 736 | struct objfile *objfile, minimal_symbol *msymbol) |
| 737 | { |
| 738 | CORE_ADDR address; |
| 739 | type *the_type = find_minsym_type_and_address (msymbol, objfile, &address); |
| 740 | |
| 741 | if (noside == EVAL_AVOID_SIDE_EFFECTS && !TYPE_GNU_IFUNC (the_type)) |
| 742 | return value_zero (the_type, not_lval); |
| 743 | else |
| 744 | return value_at_lazy (the_type, address); |
| 745 | } |
| 746 | |
| 747 | /* Helper for returning a value when handling EVAL_SKIP. */ |
| 748 | |
| 749 | value * |
| 750 | eval_skip_value (expression *exp) |
| 751 | { |
| 752 | return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1); |
| 753 | } |
| 754 | |
| 755 | /* Evaluate a function call. The function to be called is in |
| 756 | ARGVEC[0] and the arguments passed to the function are in |
| 757 | ARGVEC[1..NARGS]. FUNCTION_NAME is the name of the function, if |
| 758 | known. DEFAULT_RETURN_TYPE is used as the function's return type |
| 759 | if the return type is unknown. */ |
| 760 | |
| 761 | static value * |
| 762 | eval_call (expression *exp, enum noside noside, |
| 763 | int nargs, value **argvec, |
| 764 | const char *function_name, |
| 765 | type *default_return_type) |
| 766 | { |
| 767 | if (argvec[0] == NULL) |
| 768 | error (_("Cannot evaluate function -- may be inlined")); |
| 769 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 770 | { |
| 771 | /* If the return type doesn't look like a function type, |
| 772 | call an error. This can happen if somebody tries to turn |
| 773 | a variable into a function call. */ |
| 774 | |
| 775 | type *ftype = value_type (argvec[0]); |
| 776 | |
| 777 | if (TYPE_CODE (ftype) == TYPE_CODE_INTERNAL_FUNCTION) |
| 778 | { |
| 779 | /* We don't know anything about what the internal |
| 780 | function might return, but we have to return |
| 781 | something. */ |
| 782 | return value_zero (builtin_type (exp->gdbarch)->builtin_int, |
| 783 | not_lval); |
| 784 | } |
| 785 | else if (TYPE_CODE (ftype) == TYPE_CODE_XMETHOD) |
| 786 | { |
| 787 | type *return_type |
| 788 | = result_type_of_xmethod (argvec[0], nargs, argvec + 1); |
| 789 | |
| 790 | if (return_type == NULL) |
| 791 | error (_("Xmethod is missing return type.")); |
| 792 | return value_zero (return_type, not_lval); |
| 793 | } |
| 794 | else if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 795 | || TYPE_CODE (ftype) == TYPE_CODE_METHOD) |
| 796 | { |
| 797 | if (TYPE_GNU_IFUNC (ftype)) |
| 798 | { |
| 799 | CORE_ADDR address = value_address (argvec[0]); |
| 800 | type *resolved_type = find_gnu_ifunc_target_type (address); |
| 801 | |
| 802 | if (resolved_type != NULL) |
| 803 | ftype = resolved_type; |
| 804 | } |
| 805 | |
| 806 | type *return_type = TYPE_TARGET_TYPE (ftype); |
| 807 | |
| 808 | if (return_type == NULL) |
| 809 | return_type = default_return_type; |
| 810 | |
| 811 | if (return_type == NULL) |
| 812 | error_call_unknown_return_type (function_name); |
| 813 | |
| 814 | return allocate_value (return_type); |
| 815 | } |
| 816 | else |
| 817 | error (_("Expression of type other than " |
| 818 | "\"Function returning ...\" used as function")); |
| 819 | } |
| 820 | switch (TYPE_CODE (value_type (argvec[0]))) |
| 821 | { |
| 822 | case TYPE_CODE_INTERNAL_FUNCTION: |
| 823 | return call_internal_function (exp->gdbarch, exp->language_defn, |
| 824 | argvec[0], nargs, argvec + 1); |
| 825 | case TYPE_CODE_XMETHOD: |
| 826 | return call_xmethod (argvec[0], nargs, argvec + 1); |
| 827 | default: |
| 828 | return call_function_by_hand (argvec[0], default_return_type, |
| 829 | nargs, argvec + 1); |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | /* Helper for evaluating an OP_FUNCALL. */ |
| 834 | |
| 835 | static value * |
| 836 | evaluate_funcall (type *expect_type, expression *exp, int *pos, |
| 837 | enum noside noside) |
| 838 | { |
| 839 | int tem; |
| 840 | int pc2 = 0; |
| 841 | value *arg1 = NULL; |
| 842 | value *arg2 = NULL; |
| 843 | int save_pos1; |
| 844 | symbol *function = NULL; |
| 845 | char *function_name = NULL; |
| 846 | const char *var_func_name = NULL; |
| 847 | |
| 848 | int pc = (*pos); |
| 849 | (*pos) += 2; |
| 850 | |
| 851 | exp_opcode op = exp->elts[*pos].opcode; |
| 852 | int nargs = longest_to_int (exp->elts[pc].longconst); |
| 853 | /* Allocate arg vector, including space for the function to be |
| 854 | called in argvec[0], a potential `this', and a terminating |
| 855 | NULL. */ |
| 856 | value **argvec = (value **) alloca (sizeof (value *) * (nargs + 3)); |
| 857 | if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR) |
| 858 | { |
| 859 | /* First, evaluate the structure into arg2. */ |
| 860 | pc2 = (*pos)++; |
| 861 | |
| 862 | if (op == STRUCTOP_MEMBER) |
| 863 | { |
| 864 | arg2 = evaluate_subexp_for_address (exp, pos, noside); |
| 865 | } |
| 866 | else |
| 867 | { |
| 868 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 869 | } |
| 870 | |
| 871 | /* If the function is a virtual function, then the aggregate |
| 872 | value (providing the structure) plays its part by providing |
| 873 | the vtable. Otherwise, it is just along for the ride: call |
| 874 | the function directly. */ |
| 875 | |
| 876 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 877 | |
| 878 | type *a1_type = check_typedef (value_type (arg1)); |
| 879 | if (noside == EVAL_SKIP) |
| 880 | tem = 1; /* Set it to the right arg index so that all |
| 881 | arguments can also be skipped. */ |
| 882 | else if (TYPE_CODE (a1_type) == TYPE_CODE_METHODPTR) |
| 883 | { |
| 884 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 885 | arg1 = value_zero (TYPE_TARGET_TYPE (a1_type), not_lval); |
| 886 | else |
| 887 | arg1 = cplus_method_ptr_to_value (&arg2, arg1); |
| 888 | |
| 889 | /* Now, say which argument to start evaluating from. */ |
| 890 | nargs++; |
| 891 | tem = 2; |
| 892 | argvec[1] = arg2; |
| 893 | } |
| 894 | else if (TYPE_CODE (a1_type) == TYPE_CODE_MEMBERPTR) |
| 895 | { |
| 896 | struct type *type_ptr |
| 897 | = lookup_pointer_type (TYPE_SELF_TYPE (a1_type)); |
| 898 | struct type *target_type_ptr |
| 899 | = lookup_pointer_type (TYPE_TARGET_TYPE (a1_type)); |
| 900 | |
| 901 | /* Now, convert these values to an address. */ |
| 902 | arg2 = value_cast (type_ptr, arg2); |
| 903 | |
| 904 | long mem_offset = value_as_long (arg1); |
| 905 | |
| 906 | arg1 = value_from_pointer (target_type_ptr, |
| 907 | value_as_long (arg2) + mem_offset); |
| 908 | arg1 = value_ind (arg1); |
| 909 | tem = 1; |
| 910 | } |
| 911 | else |
| 912 | error (_("Non-pointer-to-member value used in pointer-to-member " |
| 913 | "construct")); |
| 914 | } |
| 915 | else if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR) |
| 916 | { |
| 917 | /* Hair for method invocations. */ |
| 918 | int tem2; |
| 919 | |
| 920 | nargs++; |
| 921 | /* First, evaluate the structure into arg2. */ |
| 922 | pc2 = (*pos)++; |
| 923 | tem2 = longest_to_int (exp->elts[pc2 + 1].longconst); |
| 924 | *pos += 3 + BYTES_TO_EXP_ELEM (tem2 + 1); |
| 925 | |
| 926 | if (op == STRUCTOP_STRUCT) |
| 927 | { |
| 928 | /* If v is a variable in a register, and the user types |
| 929 | v.method (), this will produce an error, because v has no |
| 930 | address. |
| 931 | |
| 932 | A possible way around this would be to allocate a copy of |
| 933 | the variable on the stack, copy in the contents, call the |
| 934 | function, and copy out the contents. I.e. convert this |
| 935 | from call by reference to call by copy-return (or |
| 936 | whatever it's called). However, this does not work |
| 937 | because it is not the same: the method being called could |
| 938 | stash a copy of the address, and then future uses through |
| 939 | that address (after the method returns) would be expected |
| 940 | to use the variable itself, not some copy of it. */ |
| 941 | arg2 = evaluate_subexp_for_address (exp, pos, noside); |
| 942 | } |
| 943 | else |
| 944 | { |
| 945 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 946 | |
| 947 | /* Check to see if the operator '->' has been overloaded. |
| 948 | If the operator has been overloaded replace arg2 with the |
| 949 | value returned by the custom operator and continue |
| 950 | evaluation. */ |
| 951 | while (unop_user_defined_p (op, arg2)) |
| 952 | { |
| 953 | struct value *value = NULL; |
| 954 | TRY |
| 955 | { |
| 956 | value = value_x_unop (arg2, op, noside); |
| 957 | } |
| 958 | |
| 959 | CATCH (except, RETURN_MASK_ERROR) |
| 960 | { |
| 961 | if (except.error == NOT_FOUND_ERROR) |
| 962 | break; |
| 963 | else |
| 964 | throw_exception (except); |
| 965 | } |
| 966 | END_CATCH |
| 967 | |
| 968 | arg2 = value; |
| 969 | } |
| 970 | } |
| 971 | /* Now, say which argument to start evaluating from. */ |
| 972 | tem = 2; |
| 973 | } |
| 974 | else if (op == OP_SCOPE |
| 975 | && overload_resolution |
| 976 | && (exp->language_defn->la_language == language_cplus)) |
| 977 | { |
| 978 | /* Unpack it locally so we can properly handle overload |
| 979 | resolution. */ |
| 980 | char *name; |
| 981 | int local_tem; |
| 982 | |
| 983 | pc2 = (*pos)++; |
| 984 | local_tem = longest_to_int (exp->elts[pc2 + 2].longconst); |
| 985 | (*pos) += 4 + BYTES_TO_EXP_ELEM (local_tem + 1); |
| 986 | struct type *type = exp->elts[pc2 + 1].type; |
| 987 | name = &exp->elts[pc2 + 3].string; |
| 988 | |
| 989 | function = NULL; |
| 990 | function_name = NULL; |
| 991 | if (TYPE_CODE (type) == TYPE_CODE_NAMESPACE) |
| 992 | { |
| 993 | function = cp_lookup_symbol_namespace (TYPE_TAG_NAME (type), |
| 994 | name, |
| 995 | get_selected_block (0), |
| 996 | VAR_DOMAIN).symbol; |
| 997 | if (function == NULL) |
| 998 | error (_("No symbol \"%s\" in namespace \"%s\"."), |
| 999 | name, TYPE_TAG_NAME (type)); |
| 1000 | |
| 1001 | tem = 1; |
| 1002 | /* arg2 is left as NULL on purpose. */ |
| 1003 | } |
| 1004 | else |
| 1005 | { |
| 1006 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1007 | || TYPE_CODE (type) == TYPE_CODE_UNION); |
| 1008 | function_name = name; |
| 1009 | |
| 1010 | /* We need a properly typed value for method lookup. For |
| 1011 | static methods arg2 is otherwise unused. */ |
| 1012 | arg2 = value_zero (type, lval_memory); |
| 1013 | ++nargs; |
| 1014 | tem = 2; |
| 1015 | } |
| 1016 | } |
| 1017 | else if (op == OP_ADL_FUNC) |
| 1018 | { |
| 1019 | /* Save the function position and move pos so that the arguments |
| 1020 | can be evaluated. */ |
| 1021 | int func_name_len; |
| 1022 | |
| 1023 | save_pos1 = *pos; |
| 1024 | tem = 1; |
| 1025 | |
| 1026 | func_name_len = longest_to_int (exp->elts[save_pos1 + 3].longconst); |
| 1027 | (*pos) += 6 + BYTES_TO_EXP_ELEM (func_name_len + 1); |
| 1028 | } |
| 1029 | else |
| 1030 | { |
| 1031 | /* Non-method function call. */ |
| 1032 | save_pos1 = *pos; |
| 1033 | tem = 1; |
| 1034 | |
| 1035 | /* If this is a C++ function wait until overload resolution. */ |
| 1036 | if (op == OP_VAR_VALUE |
| 1037 | && overload_resolution |
| 1038 | && (exp->language_defn->la_language == language_cplus)) |
| 1039 | { |
| 1040 | (*pos) += 4; /* Skip the evaluation of the symbol. */ |
| 1041 | argvec[0] = NULL; |
| 1042 | } |
| 1043 | else |
| 1044 | { |
| 1045 | if (op == OP_VAR_MSYM_VALUE) |
| 1046 | { |
| 1047 | minimal_symbol *msym = exp->elts[*pos + 2].msymbol; |
| 1048 | var_func_name = MSYMBOL_PRINT_NAME (msym); |
| 1049 | } |
| 1050 | else if (op == OP_VAR_VALUE) |
| 1051 | { |
| 1052 | symbol *sym = exp->elts[*pos + 2].symbol; |
| 1053 | var_func_name = SYMBOL_PRINT_NAME (sym); |
| 1054 | } |
| 1055 | |
| 1056 | argvec[0] = evaluate_subexp_with_coercion (exp, pos, noside); |
| 1057 | type *type = value_type (argvec[0]); |
| 1058 | if (type && TYPE_CODE (type) == TYPE_CODE_PTR) |
| 1059 | type = TYPE_TARGET_TYPE (type); |
| 1060 | if (type && TYPE_CODE (type) == TYPE_CODE_FUNC) |
| 1061 | { |
| 1062 | for (; tem <= nargs && tem <= TYPE_NFIELDS (type); tem++) |
| 1063 | { |
| 1064 | argvec[tem] = evaluate_subexp (TYPE_FIELD_TYPE (type, |
| 1065 | tem - 1), |
| 1066 | exp, pos, noside); |
| 1067 | } |
| 1068 | } |
| 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | /* Evaluate arguments (if not already done, e.g., namespace::func() |
| 1073 | and overload-resolution is off). */ |
| 1074 | for (; tem <= nargs; tem++) |
| 1075 | { |
| 1076 | /* Ensure that array expressions are coerced into pointer |
| 1077 | objects. */ |
| 1078 | argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside); |
| 1079 | } |
| 1080 | |
| 1081 | /* Signal end of arglist. */ |
| 1082 | argvec[tem] = 0; |
| 1083 | |
| 1084 | if (noside == EVAL_SKIP) |
| 1085 | return eval_skip_value (exp); |
| 1086 | |
| 1087 | if (op == OP_ADL_FUNC) |
| 1088 | { |
| 1089 | struct symbol *symp; |
| 1090 | char *func_name; |
| 1091 | int name_len; |
| 1092 | int string_pc = save_pos1 + 3; |
| 1093 | |
| 1094 | /* Extract the function name. */ |
| 1095 | name_len = longest_to_int (exp->elts[string_pc].longconst); |
| 1096 | func_name = (char *) alloca (name_len + 1); |
| 1097 | strcpy (func_name, &exp->elts[string_pc + 1].string); |
| 1098 | |
| 1099 | find_overload_match (&argvec[1], nargs, func_name, |
| 1100 | NON_METHOD, /* not method */ |
| 1101 | NULL, NULL, /* pass NULL symbol since |
| 1102 | symbol is unknown */ |
| 1103 | NULL, &symp, NULL, 0, noside); |
| 1104 | |
| 1105 | /* Now fix the expression being evaluated. */ |
| 1106 | exp->elts[save_pos1 + 2].symbol = symp; |
| 1107 | argvec[0] = evaluate_subexp_with_coercion (exp, &save_pos1, noside); |
| 1108 | } |
| 1109 | |
| 1110 | if (op == STRUCTOP_STRUCT || op == STRUCTOP_PTR |
| 1111 | || (op == OP_SCOPE && function_name != NULL)) |
| 1112 | { |
| 1113 | int static_memfuncp; |
| 1114 | char *tstr; |
| 1115 | |
| 1116 | /* Method invocation: stuff "this" as first parameter. If the |
| 1117 | method turns out to be static we undo this below. */ |
| 1118 | argvec[1] = arg2; |
| 1119 | |
| 1120 | if (op != OP_SCOPE) |
| 1121 | { |
| 1122 | /* Name of method from expression. */ |
| 1123 | tstr = &exp->elts[pc2 + 2].string; |
| 1124 | } |
| 1125 | else |
| 1126 | tstr = function_name; |
| 1127 | |
| 1128 | if (overload_resolution && (exp->language_defn->la_language |
| 1129 | == language_cplus)) |
| 1130 | { |
| 1131 | /* Language is C++, do some overload resolution before |
| 1132 | evaluation. */ |
| 1133 | struct value *valp = NULL; |
| 1134 | |
| 1135 | (void) find_overload_match (&argvec[1], nargs, tstr, |
| 1136 | METHOD, /* method */ |
| 1137 | &arg2, /* the object */ |
| 1138 | NULL, &valp, NULL, |
| 1139 | &static_memfuncp, 0, noside); |
| 1140 | |
| 1141 | if (op == OP_SCOPE && !static_memfuncp) |
| 1142 | { |
| 1143 | /* For the time being, we don't handle this. */ |
| 1144 | error (_("Call to overloaded function %s requires " |
| 1145 | "`this' pointer"), |
| 1146 | function_name); |
| 1147 | } |
| 1148 | argvec[1] = arg2; /* the ``this'' pointer */ |
| 1149 | argvec[0] = valp; /* Use the method found after overload |
| 1150 | resolution. */ |
| 1151 | } |
| 1152 | else |
| 1153 | /* Non-C++ case -- or no overload resolution. */ |
| 1154 | { |
| 1155 | struct value *temp = arg2; |
| 1156 | |
| 1157 | argvec[0] = value_struct_elt (&temp, argvec + 1, tstr, |
| 1158 | &static_memfuncp, |
| 1159 | op == STRUCTOP_STRUCT |
| 1160 | ? "structure" : "structure pointer"); |
| 1161 | /* value_struct_elt updates temp with the correct value of |
| 1162 | the ``this'' pointer if necessary, so modify argvec[1] to |
| 1163 | reflect any ``this'' changes. */ |
| 1164 | arg2 |
| 1165 | = value_from_longest (lookup_pointer_type(value_type (temp)), |
| 1166 | value_address (temp) |
| 1167 | + value_embedded_offset (temp)); |
| 1168 | argvec[1] = arg2; /* the ``this'' pointer */ |
| 1169 | } |
| 1170 | |
| 1171 | /* Take out `this' if needed. */ |
| 1172 | if (static_memfuncp) |
| 1173 | { |
| 1174 | argvec[1] = argvec[0]; |
| 1175 | nargs--; |
| 1176 | argvec++; |
| 1177 | } |
| 1178 | } |
| 1179 | else if (op == STRUCTOP_MEMBER || op == STRUCTOP_MPTR) |
| 1180 | { |
| 1181 | /* Pointer to member. argvec[1] is already set up. */ |
| 1182 | argvec[0] = arg1; |
| 1183 | } |
| 1184 | else if (op == OP_VAR_VALUE || (op == OP_SCOPE && function != NULL)) |
| 1185 | { |
| 1186 | /* Non-member function being called. */ |
| 1187 | /* fn: This can only be done for C++ functions. A C-style |
| 1188 | function in a C++ program, for instance, does not have the |
| 1189 | fields that are expected here. */ |
| 1190 | |
| 1191 | if (overload_resolution && (exp->language_defn->la_language |
| 1192 | == language_cplus)) |
| 1193 | { |
| 1194 | /* Language is C++, do some overload resolution before |
| 1195 | evaluation. */ |
| 1196 | struct symbol *symp; |
| 1197 | int no_adl = 0; |
| 1198 | |
| 1199 | /* If a scope has been specified disable ADL. */ |
| 1200 | if (op == OP_SCOPE) |
| 1201 | no_adl = 1; |
| 1202 | |
| 1203 | if (op == OP_VAR_VALUE) |
| 1204 | function = exp->elts[save_pos1+2].symbol; |
| 1205 | |
| 1206 | (void) find_overload_match (&argvec[1], nargs, |
| 1207 | NULL, /* no need for name */ |
| 1208 | NON_METHOD, /* not method */ |
| 1209 | NULL, function, /* the function */ |
| 1210 | NULL, &symp, NULL, no_adl, noside); |
| 1211 | |
| 1212 | if (op == OP_VAR_VALUE) |
| 1213 | { |
| 1214 | /* Now fix the expression being evaluated. */ |
| 1215 | exp->elts[save_pos1+2].symbol = symp; |
| 1216 | argvec[0] = evaluate_subexp_with_coercion (exp, &save_pos1, |
| 1217 | noside); |
| 1218 | } |
| 1219 | else |
| 1220 | argvec[0] = value_of_variable (symp, get_selected_block (0)); |
| 1221 | } |
| 1222 | else |
| 1223 | { |
| 1224 | /* Not C++, or no overload resolution allowed. */ |
| 1225 | /* Nothing to be done; argvec already correctly set up. */ |
| 1226 | } |
| 1227 | } |
| 1228 | else |
| 1229 | { |
| 1230 | /* It is probably a C-style function. */ |
| 1231 | /* Nothing to be done; argvec already correctly set up. */ |
| 1232 | } |
| 1233 | |
| 1234 | return eval_call (exp, noside, nargs, argvec, var_func_name, expect_type); |
| 1235 | } |
| 1236 | |
| 1237 | struct value * |
| 1238 | evaluate_subexp_standard (struct type *expect_type, |
| 1239 | struct expression *exp, int *pos, |
| 1240 | enum noside noside) |
| 1241 | { |
| 1242 | enum exp_opcode op; |
| 1243 | int tem, tem2, tem3; |
| 1244 | int pc, oldpos; |
| 1245 | struct value *arg1 = NULL; |
| 1246 | struct value *arg2 = NULL; |
| 1247 | struct value *arg3; |
| 1248 | struct type *type; |
| 1249 | int nargs; |
| 1250 | struct value **argvec; |
| 1251 | int code; |
| 1252 | int ix; |
| 1253 | long mem_offset; |
| 1254 | struct type **arg_types; |
| 1255 | |
| 1256 | pc = (*pos)++; |
| 1257 | op = exp->elts[pc].opcode; |
| 1258 | |
| 1259 | switch (op) |
| 1260 | { |
| 1261 | case OP_SCOPE: |
| 1262 | tem = longest_to_int (exp->elts[pc + 2].longconst); |
| 1263 | (*pos) += 4 + BYTES_TO_EXP_ELEM (tem + 1); |
| 1264 | if (noside == EVAL_SKIP) |
| 1265 | return eval_skip_value (exp); |
| 1266 | arg1 = value_aggregate_elt (exp->elts[pc + 1].type, |
| 1267 | &exp->elts[pc + 3].string, |
| 1268 | expect_type, 0, noside); |
| 1269 | if (arg1 == NULL) |
| 1270 | error (_("There is no field named %s"), &exp->elts[pc + 3].string); |
| 1271 | return arg1; |
| 1272 | |
| 1273 | case OP_LONG: |
| 1274 | (*pos) += 3; |
| 1275 | return value_from_longest (exp->elts[pc + 1].type, |
| 1276 | exp->elts[pc + 2].longconst); |
| 1277 | |
| 1278 | case OP_FLOAT: |
| 1279 | (*pos) += 3; |
| 1280 | return value_from_contents (exp->elts[pc + 1].type, |
| 1281 | exp->elts[pc + 2].floatconst); |
| 1282 | |
| 1283 | case OP_ADL_FUNC: |
| 1284 | case OP_VAR_VALUE: |
| 1285 | (*pos) += 3; |
| 1286 | if (noside == EVAL_SKIP) |
| 1287 | return eval_skip_value (exp); |
| 1288 | |
| 1289 | { |
| 1290 | symbol *var = exp->elts[pc + 2].symbol; |
| 1291 | if (TYPE_CODE (SYMBOL_TYPE (var)) == TYPE_CODE_ERROR) |
| 1292 | error_unknown_type (SYMBOL_PRINT_NAME (var)); |
| 1293 | |
| 1294 | return evaluate_var_value (noside, exp->elts[pc + 1].block, var); |
| 1295 | } |
| 1296 | |
| 1297 | case OP_VAR_MSYM_VALUE: |
| 1298 | { |
| 1299 | (*pos) += 3; |
| 1300 | |
| 1301 | minimal_symbol *msymbol = exp->elts[pc + 2].msymbol; |
| 1302 | value *val = evaluate_var_msym_value (noside, |
| 1303 | exp->elts[pc + 1].objfile, |
| 1304 | msymbol); |
| 1305 | |
| 1306 | type = value_type (val); |
| 1307 | if (TYPE_CODE (type) == TYPE_CODE_ERROR |
| 1308 | && (noside != EVAL_AVOID_SIDE_EFFECTS || pc != 0)) |
| 1309 | error_unknown_type (MSYMBOL_PRINT_NAME (msymbol)); |
| 1310 | return val; |
| 1311 | } |
| 1312 | |
| 1313 | case OP_VAR_ENTRY_VALUE: |
| 1314 | (*pos) += 2; |
| 1315 | if (noside == EVAL_SKIP) |
| 1316 | return eval_skip_value (exp); |
| 1317 | |
| 1318 | { |
| 1319 | struct symbol *sym = exp->elts[pc + 1].symbol; |
| 1320 | struct frame_info *frame; |
| 1321 | |
| 1322 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 1323 | return value_zero (SYMBOL_TYPE (sym), not_lval); |
| 1324 | |
| 1325 | if (SYMBOL_COMPUTED_OPS (sym) == NULL |
| 1326 | || SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry == NULL) |
| 1327 | error (_("Symbol \"%s\" does not have any specific entry value"), |
| 1328 | SYMBOL_PRINT_NAME (sym)); |
| 1329 | |
| 1330 | frame = get_selected_frame (NULL); |
| 1331 | return SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry (sym, frame); |
| 1332 | } |
| 1333 | |
| 1334 | case OP_FUNC_STATIC_VAR: |
| 1335 | tem = longest_to_int (exp->elts[pc + 1].longconst); |
| 1336 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); |
| 1337 | if (noside == EVAL_SKIP) |
| 1338 | return eval_skip_value (exp); |
| 1339 | |
| 1340 | { |
| 1341 | value *func = evaluate_subexp_standard (NULL, exp, pos, noside); |
| 1342 | CORE_ADDR addr = value_address (func); |
| 1343 | |
| 1344 | const block *blk = block_for_pc (addr); |
| 1345 | const char *var = &exp->elts[pc + 2].string; |
| 1346 | |
| 1347 | struct block_symbol sym = lookup_symbol (var, blk, VAR_DOMAIN, NULL); |
| 1348 | |
| 1349 | if (sym.symbol == NULL) |
| 1350 | error (_("No symbol \"%s\" in specified context."), var); |
| 1351 | |
| 1352 | return evaluate_var_value (noside, sym.block, sym.symbol); |
| 1353 | } |
| 1354 | |
| 1355 | case OP_LAST: |
| 1356 | (*pos) += 2; |
| 1357 | return |
| 1358 | access_value_history (longest_to_int (exp->elts[pc + 1].longconst)); |
| 1359 | |
| 1360 | case OP_REGISTER: |
| 1361 | { |
| 1362 | const char *name = &exp->elts[pc + 2].string; |
| 1363 | int regno; |
| 1364 | struct value *val; |
| 1365 | |
| 1366 | (*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1); |
| 1367 | regno = user_reg_map_name_to_regnum (exp->gdbarch, |
| 1368 | name, strlen (name)); |
| 1369 | if (regno == -1) |
| 1370 | error (_("Register $%s not available."), name); |
| 1371 | |
| 1372 | /* In EVAL_AVOID_SIDE_EFFECTS mode, we only need to return |
| 1373 | a value with the appropriate register type. Unfortunately, |
| 1374 | we don't have easy access to the type of user registers. |
| 1375 | So for these registers, we fetch the register value regardless |
| 1376 | of the evaluation mode. */ |
| 1377 | if (noside == EVAL_AVOID_SIDE_EFFECTS |
| 1378 | && regno < gdbarch_num_regs (exp->gdbarch) |
| 1379 | + gdbarch_num_pseudo_regs (exp->gdbarch)) |
| 1380 | val = value_zero (register_type (exp->gdbarch, regno), not_lval); |
| 1381 | else |
| 1382 | val = value_of_register (regno, get_selected_frame (NULL)); |
| 1383 | if (val == NULL) |
| 1384 | error (_("Value of register %s not available."), name); |
| 1385 | else |
| 1386 | return val; |
| 1387 | } |
| 1388 | case OP_BOOL: |
| 1389 | (*pos) += 2; |
| 1390 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 1391 | return value_from_longest (type, exp->elts[pc + 1].longconst); |
| 1392 | |
| 1393 | case OP_INTERNALVAR: |
| 1394 | (*pos) += 2; |
| 1395 | return value_of_internalvar (exp->gdbarch, |
| 1396 | exp->elts[pc + 1].internalvar); |
| 1397 | |
| 1398 | case OP_STRING: |
| 1399 | tem = longest_to_int (exp->elts[pc + 1].longconst); |
| 1400 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); |
| 1401 | if (noside == EVAL_SKIP) |
| 1402 | return eval_skip_value (exp); |
| 1403 | type = language_string_char_type (exp->language_defn, exp->gdbarch); |
| 1404 | return value_string (&exp->elts[pc + 2].string, tem, type); |
| 1405 | |
| 1406 | case OP_OBJC_NSSTRING: /* Objective C Foundation Class |
| 1407 | NSString constant. */ |
| 1408 | tem = longest_to_int (exp->elts[pc + 1].longconst); |
| 1409 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); |
| 1410 | if (noside == EVAL_SKIP) |
| 1411 | return eval_skip_value (exp); |
| 1412 | return value_nsstring (exp->gdbarch, &exp->elts[pc + 2].string, tem + 1); |
| 1413 | |
| 1414 | case OP_ARRAY: |
| 1415 | (*pos) += 3; |
| 1416 | tem2 = longest_to_int (exp->elts[pc + 1].longconst); |
| 1417 | tem3 = longest_to_int (exp->elts[pc + 2].longconst); |
| 1418 | nargs = tem3 - tem2 + 1; |
| 1419 | type = expect_type ? check_typedef (expect_type) : NULL_TYPE; |
| 1420 | |
| 1421 | if (expect_type != NULL_TYPE && noside != EVAL_SKIP |
| 1422 | && TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 1423 | { |
| 1424 | struct value *rec = allocate_value (expect_type); |
| 1425 | |
| 1426 | memset (value_contents_raw (rec), '\0', TYPE_LENGTH (type)); |
| 1427 | return evaluate_struct_tuple (rec, exp, pos, noside, nargs); |
| 1428 | } |
| 1429 | |
| 1430 | if (expect_type != NULL_TYPE && noside != EVAL_SKIP |
| 1431 | && TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 1432 | { |
| 1433 | struct type *range_type = TYPE_INDEX_TYPE (type); |
| 1434 | struct type *element_type = TYPE_TARGET_TYPE (type); |
| 1435 | struct value *array = allocate_value (expect_type); |
| 1436 | int element_size = TYPE_LENGTH (check_typedef (element_type)); |
| 1437 | LONGEST low_bound, high_bound, index; |
| 1438 | |
| 1439 | if (get_discrete_bounds (range_type, &low_bound, &high_bound) < 0) |
| 1440 | { |
| 1441 | low_bound = 0; |
| 1442 | high_bound = (TYPE_LENGTH (type) / element_size) - 1; |
| 1443 | } |
| 1444 | index = low_bound; |
| 1445 | memset (value_contents_raw (array), 0, TYPE_LENGTH (expect_type)); |
| 1446 | for (tem = nargs; --nargs >= 0;) |
| 1447 | { |
| 1448 | struct value *element; |
| 1449 | int index_pc = 0; |
| 1450 | |
| 1451 | element = evaluate_subexp (element_type, exp, pos, noside); |
| 1452 | if (value_type (element) != element_type) |
| 1453 | element = value_cast (element_type, element); |
| 1454 | if (index_pc) |
| 1455 | { |
| 1456 | int continue_pc = *pos; |
| 1457 | |
| 1458 | *pos = index_pc; |
| 1459 | index = init_array_element (array, element, exp, pos, noside, |
| 1460 | low_bound, high_bound); |
| 1461 | *pos = continue_pc; |
| 1462 | } |
| 1463 | else |
| 1464 | { |
| 1465 | if (index > high_bound) |
| 1466 | /* To avoid memory corruption. */ |
| 1467 | error (_("Too many array elements")); |
| 1468 | memcpy (value_contents_raw (array) |
| 1469 | + (index - low_bound) * element_size, |
| 1470 | value_contents (element), |
| 1471 | element_size); |
| 1472 | } |
| 1473 | index++; |
| 1474 | } |
| 1475 | return array; |
| 1476 | } |
| 1477 | |
| 1478 | if (expect_type != NULL_TYPE && noside != EVAL_SKIP |
| 1479 | && TYPE_CODE (type) == TYPE_CODE_SET) |
| 1480 | { |
| 1481 | struct value *set = allocate_value (expect_type); |
| 1482 | gdb_byte *valaddr = value_contents_raw (set); |
| 1483 | struct type *element_type = TYPE_INDEX_TYPE (type); |
| 1484 | struct type *check_type = element_type; |
| 1485 | LONGEST low_bound, high_bound; |
| 1486 | |
| 1487 | /* Get targettype of elementtype. */ |
| 1488 | while (TYPE_CODE (check_type) == TYPE_CODE_RANGE |
| 1489 | || TYPE_CODE (check_type) == TYPE_CODE_TYPEDEF) |
| 1490 | check_type = TYPE_TARGET_TYPE (check_type); |
| 1491 | |
| 1492 | if (get_discrete_bounds (element_type, &low_bound, &high_bound) < 0) |
| 1493 | error (_("(power)set type with unknown size")); |
| 1494 | memset (valaddr, '\0', TYPE_LENGTH (type)); |
| 1495 | for (tem = 0; tem < nargs; tem++) |
| 1496 | { |
| 1497 | LONGEST range_low, range_high; |
| 1498 | struct type *range_low_type, *range_high_type; |
| 1499 | struct value *elem_val; |
| 1500 | |
| 1501 | elem_val = evaluate_subexp (element_type, exp, pos, noside); |
| 1502 | range_low_type = range_high_type = value_type (elem_val); |
| 1503 | range_low = range_high = value_as_long (elem_val); |
| 1504 | |
| 1505 | /* Check types of elements to avoid mixture of elements from |
| 1506 | different types. Also check if type of element is "compatible" |
| 1507 | with element type of powerset. */ |
| 1508 | if (TYPE_CODE (range_low_type) == TYPE_CODE_RANGE) |
| 1509 | range_low_type = TYPE_TARGET_TYPE (range_low_type); |
| 1510 | if (TYPE_CODE (range_high_type) == TYPE_CODE_RANGE) |
| 1511 | range_high_type = TYPE_TARGET_TYPE (range_high_type); |
| 1512 | if ((TYPE_CODE (range_low_type) != TYPE_CODE (range_high_type)) |
| 1513 | || (TYPE_CODE (range_low_type) == TYPE_CODE_ENUM |
| 1514 | && (range_low_type != range_high_type))) |
| 1515 | /* different element modes. */ |
| 1516 | error (_("POWERSET tuple elements of different mode")); |
| 1517 | if ((TYPE_CODE (check_type) != TYPE_CODE (range_low_type)) |
| 1518 | || (TYPE_CODE (check_type) == TYPE_CODE_ENUM |
| 1519 | && range_low_type != check_type)) |
| 1520 | error (_("incompatible POWERSET tuple elements")); |
| 1521 | if (range_low > range_high) |
| 1522 | { |
| 1523 | warning (_("empty POWERSET tuple range")); |
| 1524 | continue; |
| 1525 | } |
| 1526 | if (range_low < low_bound || range_high > high_bound) |
| 1527 | error (_("POWERSET tuple element out of range")); |
| 1528 | range_low -= low_bound; |
| 1529 | range_high -= low_bound; |
| 1530 | for (; range_low <= range_high; range_low++) |
| 1531 | { |
| 1532 | int bit_index = (unsigned) range_low % TARGET_CHAR_BIT; |
| 1533 | |
| 1534 | if (gdbarch_bits_big_endian (exp->gdbarch)) |
| 1535 | bit_index = TARGET_CHAR_BIT - 1 - bit_index; |
| 1536 | valaddr[(unsigned) range_low / TARGET_CHAR_BIT] |
| 1537 | |= 1 << bit_index; |
| 1538 | } |
| 1539 | } |
| 1540 | return set; |
| 1541 | } |
| 1542 | |
| 1543 | argvec = XALLOCAVEC (struct value *, nargs); |
| 1544 | for (tem = 0; tem < nargs; tem++) |
| 1545 | { |
| 1546 | /* Ensure that array expressions are coerced into pointer |
| 1547 | objects. */ |
| 1548 | argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside); |
| 1549 | } |
| 1550 | if (noside == EVAL_SKIP) |
| 1551 | return eval_skip_value (exp); |
| 1552 | return value_array (tem2, tem3, argvec); |
| 1553 | |
| 1554 | case TERNOP_SLICE: |
| 1555 | { |
| 1556 | struct value *array = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1557 | int lowbound |
| 1558 | = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); |
| 1559 | int upper |
| 1560 | = value_as_long (evaluate_subexp (NULL_TYPE, exp, pos, noside)); |
| 1561 | |
| 1562 | if (noside == EVAL_SKIP) |
| 1563 | return eval_skip_value (exp); |
| 1564 | return value_slice (array, lowbound, upper - lowbound + 1); |
| 1565 | } |
| 1566 | |
| 1567 | case TERNOP_COND: |
| 1568 | /* Skip third and second args to evaluate the first one. */ |
| 1569 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1570 | if (value_logical_not (arg1)) |
| 1571 | { |
| 1572 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 1573 | return evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1574 | } |
| 1575 | else |
| 1576 | { |
| 1577 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1578 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 1579 | return arg2; |
| 1580 | } |
| 1581 | |
| 1582 | case OP_OBJC_SELECTOR: |
| 1583 | { /* Objective C @selector operator. */ |
| 1584 | char *sel = &exp->elts[pc + 2].string; |
| 1585 | int len = longest_to_int (exp->elts[pc + 1].longconst); |
| 1586 | struct type *selector_type; |
| 1587 | |
| 1588 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); |
| 1589 | if (noside == EVAL_SKIP) |
| 1590 | return eval_skip_value (exp); |
| 1591 | |
| 1592 | if (sel[len] != 0) |
| 1593 | sel[len] = 0; /* Make sure it's terminated. */ |
| 1594 | |
| 1595 | selector_type = builtin_type (exp->gdbarch)->builtin_data_ptr; |
| 1596 | return value_from_longest (selector_type, |
| 1597 | lookup_child_selector (exp->gdbarch, sel)); |
| 1598 | } |
| 1599 | |
| 1600 | case OP_OBJC_MSGCALL: |
| 1601 | { /* Objective C message (method) call. */ |
| 1602 | |
| 1603 | CORE_ADDR responds_selector = 0; |
| 1604 | CORE_ADDR method_selector = 0; |
| 1605 | |
| 1606 | CORE_ADDR selector = 0; |
| 1607 | |
| 1608 | int struct_return = 0; |
| 1609 | enum noside sub_no_side = EVAL_NORMAL; |
| 1610 | |
| 1611 | struct value *msg_send = NULL; |
| 1612 | struct value *msg_send_stret = NULL; |
| 1613 | int gnu_runtime = 0; |
| 1614 | |
| 1615 | struct value *target = NULL; |
| 1616 | struct value *method = NULL; |
| 1617 | struct value *called_method = NULL; |
| 1618 | |
| 1619 | struct type *selector_type = NULL; |
| 1620 | struct type *long_type; |
| 1621 | |
| 1622 | struct value *ret = NULL; |
| 1623 | CORE_ADDR addr = 0; |
| 1624 | |
| 1625 | selector = exp->elts[pc + 1].longconst; |
| 1626 | nargs = exp->elts[pc + 2].longconst; |
| 1627 | argvec = XALLOCAVEC (struct value *, nargs + 5); |
| 1628 | |
| 1629 | (*pos) += 3; |
| 1630 | |
| 1631 | long_type = builtin_type (exp->gdbarch)->builtin_long; |
| 1632 | selector_type = builtin_type (exp->gdbarch)->builtin_data_ptr; |
| 1633 | |
| 1634 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 1635 | sub_no_side = EVAL_NORMAL; |
| 1636 | else |
| 1637 | sub_no_side = noside; |
| 1638 | |
| 1639 | target = evaluate_subexp (selector_type, exp, pos, sub_no_side); |
| 1640 | |
| 1641 | if (value_as_long (target) == 0) |
| 1642 | return value_from_longest (long_type, 0); |
| 1643 | |
| 1644 | if (lookup_minimal_symbol ("objc_msg_lookup", 0, 0).minsym) |
| 1645 | gnu_runtime = 1; |
| 1646 | |
| 1647 | /* Find the method dispatch (Apple runtime) or method lookup |
| 1648 | (GNU runtime) function for Objective-C. These will be used |
| 1649 | to lookup the symbol information for the method. If we |
| 1650 | can't find any symbol information, then we'll use these to |
| 1651 | call the method, otherwise we can call the method |
| 1652 | directly. The msg_send_stret function is used in the special |
| 1653 | case of a method that returns a structure (Apple runtime |
| 1654 | only). */ |
| 1655 | if (gnu_runtime) |
| 1656 | { |
| 1657 | struct type *type = selector_type; |
| 1658 | |
| 1659 | type = lookup_function_type (type); |
| 1660 | type = lookup_pointer_type (type); |
| 1661 | type = lookup_function_type (type); |
| 1662 | type = lookup_pointer_type (type); |
| 1663 | |
| 1664 | msg_send = find_function_in_inferior ("objc_msg_lookup", NULL); |
| 1665 | msg_send_stret |
| 1666 | = find_function_in_inferior ("objc_msg_lookup", NULL); |
| 1667 | |
| 1668 | msg_send = value_from_pointer (type, value_as_address (msg_send)); |
| 1669 | msg_send_stret = value_from_pointer (type, |
| 1670 | value_as_address (msg_send_stret)); |
| 1671 | } |
| 1672 | else |
| 1673 | { |
| 1674 | msg_send = find_function_in_inferior ("objc_msgSend", NULL); |
| 1675 | /* Special dispatcher for methods returning structs. */ |
| 1676 | msg_send_stret |
| 1677 | = find_function_in_inferior ("objc_msgSend_stret", NULL); |
| 1678 | } |
| 1679 | |
| 1680 | /* Verify the target object responds to this method. The |
| 1681 | standard top-level 'Object' class uses a different name for |
| 1682 | the verification method than the non-standard, but more |
| 1683 | often used, 'NSObject' class. Make sure we check for both. */ |
| 1684 | |
| 1685 | responds_selector |
| 1686 | = lookup_child_selector (exp->gdbarch, "respondsToSelector:"); |
| 1687 | if (responds_selector == 0) |
| 1688 | responds_selector |
| 1689 | = lookup_child_selector (exp->gdbarch, "respondsTo:"); |
| 1690 | |
| 1691 | if (responds_selector == 0) |
| 1692 | error (_("no 'respondsTo:' or 'respondsToSelector:' method")); |
| 1693 | |
| 1694 | method_selector |
| 1695 | = lookup_child_selector (exp->gdbarch, "methodForSelector:"); |
| 1696 | if (method_selector == 0) |
| 1697 | method_selector |
| 1698 | = lookup_child_selector (exp->gdbarch, "methodFor:"); |
| 1699 | |
| 1700 | if (method_selector == 0) |
| 1701 | error (_("no 'methodFor:' or 'methodForSelector:' method")); |
| 1702 | |
| 1703 | /* Call the verification method, to make sure that the target |
| 1704 | class implements the desired method. */ |
| 1705 | |
| 1706 | argvec[0] = msg_send; |
| 1707 | argvec[1] = target; |
| 1708 | argvec[2] = value_from_longest (long_type, responds_selector); |
| 1709 | argvec[3] = value_from_longest (long_type, selector); |
| 1710 | argvec[4] = 0; |
| 1711 | |
| 1712 | ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1); |
| 1713 | if (gnu_runtime) |
| 1714 | { |
| 1715 | /* Function objc_msg_lookup returns a pointer. */ |
| 1716 | argvec[0] = ret; |
| 1717 | ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1); |
| 1718 | } |
| 1719 | if (value_as_long (ret) == 0) |
| 1720 | error (_("Target does not respond to this message selector.")); |
| 1721 | |
| 1722 | /* Call "methodForSelector:" method, to get the address of a |
| 1723 | function method that implements this selector for this |
| 1724 | class. If we can find a symbol at that address, then we |
| 1725 | know the return type, parameter types etc. (that's a good |
| 1726 | thing). */ |
| 1727 | |
| 1728 | argvec[0] = msg_send; |
| 1729 | argvec[1] = target; |
| 1730 | argvec[2] = value_from_longest (long_type, method_selector); |
| 1731 | argvec[3] = value_from_longest (long_type, selector); |
| 1732 | argvec[4] = 0; |
| 1733 | |
| 1734 | ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1); |
| 1735 | if (gnu_runtime) |
| 1736 | { |
| 1737 | argvec[0] = ret; |
| 1738 | ret = call_function_by_hand (argvec[0], NULL, 3, argvec + 1); |
| 1739 | } |
| 1740 | |
| 1741 | /* ret should now be the selector. */ |
| 1742 | |
| 1743 | addr = value_as_long (ret); |
| 1744 | if (addr) |
| 1745 | { |
| 1746 | struct symbol *sym = NULL; |
| 1747 | |
| 1748 | /* The address might point to a function descriptor; |
| 1749 | resolve it to the actual code address instead. */ |
| 1750 | addr = gdbarch_convert_from_func_ptr_addr (exp->gdbarch, addr, |
| 1751 | target_stack); |
| 1752 | |
| 1753 | /* Is it a high_level symbol? */ |
| 1754 | sym = find_pc_function (addr); |
| 1755 | if (sym != NULL) |
| 1756 | method = value_of_variable (sym, 0); |
| 1757 | } |
| 1758 | |
| 1759 | /* If we found a method with symbol information, check to see |
| 1760 | if it returns a struct. Otherwise assume it doesn't. */ |
| 1761 | |
| 1762 | if (method) |
| 1763 | { |
| 1764 | CORE_ADDR funaddr; |
| 1765 | struct type *val_type; |
| 1766 | |
| 1767 | funaddr = find_function_addr (method, &val_type); |
| 1768 | |
| 1769 | block_for_pc (funaddr); |
| 1770 | |
| 1771 | val_type = check_typedef (val_type); |
| 1772 | |
| 1773 | if ((val_type == NULL) |
| 1774 | || (TYPE_CODE(val_type) == TYPE_CODE_ERROR)) |
| 1775 | { |
| 1776 | if (expect_type != NULL) |
| 1777 | val_type = expect_type; |
| 1778 | } |
| 1779 | |
| 1780 | struct_return = using_struct_return (exp->gdbarch, method, |
| 1781 | val_type); |
| 1782 | } |
| 1783 | else if (expect_type != NULL) |
| 1784 | { |
| 1785 | struct_return = using_struct_return (exp->gdbarch, NULL, |
| 1786 | check_typedef (expect_type)); |
| 1787 | } |
| 1788 | |
| 1789 | /* Found a function symbol. Now we will substitute its |
| 1790 | value in place of the message dispatcher (obj_msgSend), |
| 1791 | so that we call the method directly instead of thru |
| 1792 | the dispatcher. The main reason for doing this is that |
| 1793 | we can now evaluate the return value and parameter values |
| 1794 | according to their known data types, in case we need to |
| 1795 | do things like promotion, dereferencing, special handling |
| 1796 | of structs and doubles, etc. |
| 1797 | |
| 1798 | We want to use the type signature of 'method', but still |
| 1799 | jump to objc_msgSend() or objc_msgSend_stret() to better |
| 1800 | mimic the behavior of the runtime. */ |
| 1801 | |
| 1802 | if (method) |
| 1803 | { |
| 1804 | if (TYPE_CODE (value_type (method)) != TYPE_CODE_FUNC) |
| 1805 | error (_("method address has symbol information " |
| 1806 | "with non-function type; skipping")); |
| 1807 | |
| 1808 | /* Create a function pointer of the appropriate type, and |
| 1809 | replace its value with the value of msg_send or |
| 1810 | msg_send_stret. We must use a pointer here, as |
| 1811 | msg_send and msg_send_stret are of pointer type, and |
| 1812 | the representation may be different on systems that use |
| 1813 | function descriptors. */ |
| 1814 | if (struct_return) |
| 1815 | called_method |
| 1816 | = value_from_pointer (lookup_pointer_type (value_type (method)), |
| 1817 | value_as_address (msg_send_stret)); |
| 1818 | else |
| 1819 | called_method |
| 1820 | = value_from_pointer (lookup_pointer_type (value_type (method)), |
| 1821 | value_as_address (msg_send)); |
| 1822 | } |
| 1823 | else |
| 1824 | { |
| 1825 | if (struct_return) |
| 1826 | called_method = msg_send_stret; |
| 1827 | else |
| 1828 | called_method = msg_send; |
| 1829 | } |
| 1830 | |
| 1831 | if (noside == EVAL_SKIP) |
| 1832 | return eval_skip_value (exp); |
| 1833 | |
| 1834 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 1835 | { |
| 1836 | /* If the return type doesn't look like a function type, |
| 1837 | call an error. This can happen if somebody tries to |
| 1838 | turn a variable into a function call. This is here |
| 1839 | because people often want to call, eg, strcmp, which |
| 1840 | gdb doesn't know is a function. If gdb isn't asked for |
| 1841 | it's opinion (ie. through "whatis"), it won't offer |
| 1842 | it. */ |
| 1843 | |
| 1844 | struct type *type = value_type (called_method); |
| 1845 | |
| 1846 | if (type && TYPE_CODE (type) == TYPE_CODE_PTR) |
| 1847 | type = TYPE_TARGET_TYPE (type); |
| 1848 | type = TYPE_TARGET_TYPE (type); |
| 1849 | |
| 1850 | if (type) |
| 1851 | { |
| 1852 | if ((TYPE_CODE (type) == TYPE_CODE_ERROR) && expect_type) |
| 1853 | return allocate_value (expect_type); |
| 1854 | else |
| 1855 | return allocate_value (type); |
| 1856 | } |
| 1857 | else |
| 1858 | error (_("Expression of type other than " |
| 1859 | "\"method returning ...\" used as a method")); |
| 1860 | } |
| 1861 | |
| 1862 | /* Now depending on whether we found a symbol for the method, |
| 1863 | we will either call the runtime dispatcher or the method |
| 1864 | directly. */ |
| 1865 | |
| 1866 | argvec[0] = called_method; |
| 1867 | argvec[1] = target; |
| 1868 | argvec[2] = value_from_longest (long_type, selector); |
| 1869 | /* User-supplied arguments. */ |
| 1870 | for (tem = 0; tem < nargs; tem++) |
| 1871 | argvec[tem + 3] = evaluate_subexp_with_coercion (exp, pos, noside); |
| 1872 | argvec[tem + 3] = 0; |
| 1873 | |
| 1874 | if (gnu_runtime && (method != NULL)) |
| 1875 | { |
| 1876 | /* Function objc_msg_lookup returns a pointer. */ |
| 1877 | deprecated_set_value_type (argvec[0], |
| 1878 | lookup_pointer_type (lookup_function_type (value_type (argvec[0])))); |
| 1879 | argvec[0] |
| 1880 | = call_function_by_hand (argvec[0], NULL, nargs + 2, argvec + 1); |
| 1881 | } |
| 1882 | |
| 1883 | ret = call_function_by_hand (argvec[0], NULL, nargs + 2, argvec + 1); |
| 1884 | return ret; |
| 1885 | } |
| 1886 | break; |
| 1887 | |
| 1888 | case OP_FUNCALL: |
| 1889 | return evaluate_funcall (expect_type, exp, pos, noside); |
| 1890 | |
| 1891 | case OP_F77_UNDETERMINED_ARGLIST: |
| 1892 | |
| 1893 | /* Remember that in F77, functions, substring ops and |
| 1894 | array subscript operations cannot be disambiguated |
| 1895 | at parse time. We have made all array subscript operations, |
| 1896 | substring operations as well as function calls come here |
| 1897 | and we now have to discover what the heck this thing actually was. |
| 1898 | If it is a function, we process just as if we got an OP_FUNCALL. */ |
| 1899 | |
| 1900 | nargs = longest_to_int (exp->elts[pc + 1].longconst); |
| 1901 | (*pos) += 2; |
| 1902 | |
| 1903 | /* First determine the type code we are dealing with. */ |
| 1904 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1905 | type = check_typedef (value_type (arg1)); |
| 1906 | code = TYPE_CODE (type); |
| 1907 | |
| 1908 | if (code == TYPE_CODE_PTR) |
| 1909 | { |
| 1910 | /* Fortran always passes variable to subroutines as pointer. |
| 1911 | So we need to look into its target type to see if it is |
| 1912 | array, string or function. If it is, we need to switch |
| 1913 | to the target value the original one points to. */ |
| 1914 | struct type *target_type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 1915 | |
| 1916 | if (TYPE_CODE (target_type) == TYPE_CODE_ARRAY |
| 1917 | || TYPE_CODE (target_type) == TYPE_CODE_STRING |
| 1918 | || TYPE_CODE (target_type) == TYPE_CODE_FUNC) |
| 1919 | { |
| 1920 | arg1 = value_ind (arg1); |
| 1921 | type = check_typedef (value_type (arg1)); |
| 1922 | code = TYPE_CODE (type); |
| 1923 | } |
| 1924 | } |
| 1925 | |
| 1926 | switch (code) |
| 1927 | { |
| 1928 | case TYPE_CODE_ARRAY: |
| 1929 | if (exp->elts[*pos].opcode == OP_RANGE) |
| 1930 | return value_f90_subarray (arg1, exp, pos, noside); |
| 1931 | else |
| 1932 | goto multi_f77_subscript; |
| 1933 | |
| 1934 | case TYPE_CODE_STRING: |
| 1935 | if (exp->elts[*pos].opcode == OP_RANGE) |
| 1936 | return value_f90_subarray (arg1, exp, pos, noside); |
| 1937 | else |
| 1938 | { |
| 1939 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 1940 | return value_subscript (arg1, value_as_long (arg2)); |
| 1941 | } |
| 1942 | |
| 1943 | case TYPE_CODE_PTR: |
| 1944 | case TYPE_CODE_FUNC: |
| 1945 | /* It's a function call. */ |
| 1946 | /* Allocate arg vector, including space for the function to be |
| 1947 | called in argvec[0] and a terminating NULL. */ |
| 1948 | argvec = (struct value **) |
| 1949 | alloca (sizeof (struct value *) * (nargs + 2)); |
| 1950 | argvec[0] = arg1; |
| 1951 | tem = 1; |
| 1952 | for (; tem <= nargs; tem++) |
| 1953 | argvec[tem] = evaluate_subexp_with_coercion (exp, pos, noside); |
| 1954 | argvec[tem] = 0; /* signal end of arglist */ |
| 1955 | if (noside == EVAL_SKIP) |
| 1956 | return eval_skip_value (exp); |
| 1957 | return eval_call (exp, noside, nargs, argvec, NULL, expect_type); |
| 1958 | |
| 1959 | default: |
| 1960 | error (_("Cannot perform substring on this type")); |
| 1961 | } |
| 1962 | |
| 1963 | case OP_COMPLEX: |
| 1964 | /* We have a complex number, There should be 2 floating |
| 1965 | point numbers that compose it. */ |
| 1966 | (*pos) += 2; |
| 1967 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1968 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1969 | |
| 1970 | return value_literal_complex (arg1, arg2, exp->elts[pc + 1].type); |
| 1971 | |
| 1972 | case STRUCTOP_STRUCT: |
| 1973 | tem = longest_to_int (exp->elts[pc + 1].longconst); |
| 1974 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); |
| 1975 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1976 | if (noside == EVAL_SKIP) |
| 1977 | return eval_skip_value (exp); |
| 1978 | arg3 = value_struct_elt (&arg1, NULL, &exp->elts[pc + 2].string, |
| 1979 | NULL, "structure"); |
| 1980 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 1981 | arg3 = value_zero (value_type (arg3), VALUE_LVAL (arg3)); |
| 1982 | return arg3; |
| 1983 | |
| 1984 | case STRUCTOP_PTR: |
| 1985 | tem = longest_to_int (exp->elts[pc + 1].longconst); |
| 1986 | (*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1); |
| 1987 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 1988 | if (noside == EVAL_SKIP) |
| 1989 | return eval_skip_value (exp); |
| 1990 | |
| 1991 | /* Check to see if operator '->' has been overloaded. If so replace |
| 1992 | arg1 with the value returned by evaluating operator->(). */ |
| 1993 | while (unop_user_defined_p (op, arg1)) |
| 1994 | { |
| 1995 | struct value *value = NULL; |
| 1996 | TRY |
| 1997 | { |
| 1998 | value = value_x_unop (arg1, op, noside); |
| 1999 | } |
| 2000 | |
| 2001 | CATCH (except, RETURN_MASK_ERROR) |
| 2002 | { |
| 2003 | if (except.error == NOT_FOUND_ERROR) |
| 2004 | break; |
| 2005 | else |
| 2006 | throw_exception (except); |
| 2007 | } |
| 2008 | END_CATCH |
| 2009 | |
| 2010 | arg1 = value; |
| 2011 | } |
| 2012 | |
| 2013 | /* JYG: if print object is on we need to replace the base type |
| 2014 | with rtti type in order to continue on with successful |
| 2015 | lookup of member / method only available in the rtti type. */ |
| 2016 | { |
| 2017 | struct type *type = value_type (arg1); |
| 2018 | struct type *real_type; |
| 2019 | int full, using_enc; |
| 2020 | LONGEST top; |
| 2021 | struct value_print_options opts; |
| 2022 | |
| 2023 | get_user_print_options (&opts); |
| 2024 | if (opts.objectprint && TYPE_TARGET_TYPE(type) |
| 2025 | && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT)) |
| 2026 | { |
| 2027 | real_type = value_rtti_indirect_type (arg1, &full, &top, |
| 2028 | &using_enc); |
| 2029 | if (real_type) |
| 2030 | arg1 = value_cast (real_type, arg1); |
| 2031 | } |
| 2032 | } |
| 2033 | |
| 2034 | arg3 = value_struct_elt (&arg1, NULL, &exp->elts[pc + 2].string, |
| 2035 | NULL, "structure pointer"); |
| 2036 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2037 | arg3 = value_zero (value_type (arg3), VALUE_LVAL (arg3)); |
| 2038 | return arg3; |
| 2039 | |
| 2040 | case STRUCTOP_MEMBER: |
| 2041 | case STRUCTOP_MPTR: |
| 2042 | if (op == STRUCTOP_MEMBER) |
| 2043 | arg1 = evaluate_subexp_for_address (exp, pos, noside); |
| 2044 | else |
| 2045 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2046 | |
| 2047 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2048 | |
| 2049 | if (noside == EVAL_SKIP) |
| 2050 | return eval_skip_value (exp); |
| 2051 | |
| 2052 | type = check_typedef (value_type (arg2)); |
| 2053 | switch (TYPE_CODE (type)) |
| 2054 | { |
| 2055 | case TYPE_CODE_METHODPTR: |
| 2056 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2057 | return value_zero (TYPE_TARGET_TYPE (type), not_lval); |
| 2058 | else |
| 2059 | { |
| 2060 | arg2 = cplus_method_ptr_to_value (&arg1, arg2); |
| 2061 | gdb_assert (TYPE_CODE (value_type (arg2)) == TYPE_CODE_PTR); |
| 2062 | return value_ind (arg2); |
| 2063 | } |
| 2064 | |
| 2065 | case TYPE_CODE_MEMBERPTR: |
| 2066 | /* Now, convert these values to an address. */ |
| 2067 | arg1 = value_cast_pointers (lookup_pointer_type (TYPE_SELF_TYPE (type)), |
| 2068 | arg1, 1); |
| 2069 | |
| 2070 | mem_offset = value_as_long (arg2); |
| 2071 | |
| 2072 | arg3 = value_from_pointer (lookup_pointer_type (TYPE_TARGET_TYPE (type)), |
| 2073 | value_as_long (arg1) + mem_offset); |
| 2074 | return value_ind (arg3); |
| 2075 | |
| 2076 | default: |
| 2077 | error (_("non-pointer-to-member value used " |
| 2078 | "in pointer-to-member construct")); |
| 2079 | } |
| 2080 | |
| 2081 | case TYPE_INSTANCE: |
| 2082 | { |
| 2083 | type_instance_flags flags |
| 2084 | = (type_instance_flag_value) longest_to_int (exp->elts[pc + 1].longconst); |
| 2085 | nargs = longest_to_int (exp->elts[pc + 2].longconst); |
| 2086 | arg_types = (struct type **) alloca (nargs * sizeof (struct type *)); |
| 2087 | for (ix = 0; ix < nargs; ++ix) |
| 2088 | arg_types[ix] = exp->elts[pc + 2 + ix + 1].type; |
| 2089 | |
| 2090 | fake_method expect_type (flags, nargs, arg_types); |
| 2091 | *(pos) += 4 + nargs; |
| 2092 | return evaluate_subexp_standard (expect_type.type (), exp, pos, noside); |
| 2093 | } |
| 2094 | |
| 2095 | case BINOP_CONCAT: |
| 2096 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2097 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2098 | if (noside == EVAL_SKIP) |
| 2099 | return eval_skip_value (exp); |
| 2100 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2101 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2102 | else |
| 2103 | return value_concat (arg1, arg2); |
| 2104 | |
| 2105 | case BINOP_ASSIGN: |
| 2106 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2107 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2108 | |
| 2109 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2110 | return arg1; |
| 2111 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2112 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2113 | else |
| 2114 | return value_assign (arg1, arg2); |
| 2115 | |
| 2116 | case BINOP_ASSIGN_MODIFY: |
| 2117 | (*pos) += 2; |
| 2118 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2119 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2120 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2121 | return arg1; |
| 2122 | op = exp->elts[pc + 1].opcode; |
| 2123 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2124 | return value_x_binop (arg1, arg2, BINOP_ASSIGN_MODIFY, op, noside); |
| 2125 | else if (op == BINOP_ADD && ptrmath_type_p (exp->language_defn, |
| 2126 | value_type (arg1)) |
| 2127 | && is_integral_type (value_type (arg2))) |
| 2128 | arg2 = value_ptradd (arg1, value_as_long (arg2)); |
| 2129 | else if (op == BINOP_SUB && ptrmath_type_p (exp->language_defn, |
| 2130 | value_type (arg1)) |
| 2131 | && is_integral_type (value_type (arg2))) |
| 2132 | arg2 = value_ptradd (arg1, - value_as_long (arg2)); |
| 2133 | else |
| 2134 | { |
| 2135 | struct value *tmp = arg1; |
| 2136 | |
| 2137 | /* For shift and integer exponentiation operations, |
| 2138 | only promote the first argument. */ |
| 2139 | if ((op == BINOP_LSH || op == BINOP_RSH || op == BINOP_EXP) |
| 2140 | && is_integral_type (value_type (arg2))) |
| 2141 | unop_promote (exp->language_defn, exp->gdbarch, &tmp); |
| 2142 | else |
| 2143 | binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2); |
| 2144 | |
| 2145 | arg2 = value_binop (tmp, arg2, op); |
| 2146 | } |
| 2147 | return value_assign (arg1, arg2); |
| 2148 | |
| 2149 | case BINOP_ADD: |
| 2150 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2151 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2152 | if (noside == EVAL_SKIP) |
| 2153 | return eval_skip_value (exp); |
| 2154 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2155 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2156 | else if (ptrmath_type_p (exp->language_defn, value_type (arg1)) |
| 2157 | && is_integral_type (value_type (arg2))) |
| 2158 | return value_ptradd (arg1, value_as_long (arg2)); |
| 2159 | else if (ptrmath_type_p (exp->language_defn, value_type (arg2)) |
| 2160 | && is_integral_type (value_type (arg1))) |
| 2161 | return value_ptradd (arg2, value_as_long (arg1)); |
| 2162 | else |
| 2163 | { |
| 2164 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2165 | return value_binop (arg1, arg2, BINOP_ADD); |
| 2166 | } |
| 2167 | |
| 2168 | case BINOP_SUB: |
| 2169 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2170 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2171 | if (noside == EVAL_SKIP) |
| 2172 | return eval_skip_value (exp); |
| 2173 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2174 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2175 | else if (ptrmath_type_p (exp->language_defn, value_type (arg1)) |
| 2176 | && ptrmath_type_p (exp->language_defn, value_type (arg2))) |
| 2177 | { |
| 2178 | /* FIXME -- should be ptrdiff_t */ |
| 2179 | type = builtin_type (exp->gdbarch)->builtin_long; |
| 2180 | return value_from_longest (type, value_ptrdiff (arg1, arg2)); |
| 2181 | } |
| 2182 | else if (ptrmath_type_p (exp->language_defn, value_type (arg1)) |
| 2183 | && is_integral_type (value_type (arg2))) |
| 2184 | return value_ptradd (arg1, - value_as_long (arg2)); |
| 2185 | else |
| 2186 | { |
| 2187 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2188 | return value_binop (arg1, arg2, BINOP_SUB); |
| 2189 | } |
| 2190 | |
| 2191 | case BINOP_EXP: |
| 2192 | case BINOP_MUL: |
| 2193 | case BINOP_DIV: |
| 2194 | case BINOP_INTDIV: |
| 2195 | case BINOP_REM: |
| 2196 | case BINOP_MOD: |
| 2197 | case BINOP_LSH: |
| 2198 | case BINOP_RSH: |
| 2199 | case BINOP_BITWISE_AND: |
| 2200 | case BINOP_BITWISE_IOR: |
| 2201 | case BINOP_BITWISE_XOR: |
| 2202 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2203 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2204 | if (noside == EVAL_SKIP) |
| 2205 | return eval_skip_value (exp); |
| 2206 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2207 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2208 | else |
| 2209 | { |
| 2210 | /* If EVAL_AVOID_SIDE_EFFECTS and we're dividing by zero, |
| 2211 | fudge arg2 to avoid division-by-zero, the caller is |
| 2212 | (theoretically) only looking for the type of the result. */ |
| 2213 | if (noside == EVAL_AVOID_SIDE_EFFECTS |
| 2214 | /* ??? Do we really want to test for BINOP_MOD here? |
| 2215 | The implementation of value_binop gives it a well-defined |
| 2216 | value. */ |
| 2217 | && (op == BINOP_DIV |
| 2218 | || op == BINOP_INTDIV |
| 2219 | || op == BINOP_REM |
| 2220 | || op == BINOP_MOD) |
| 2221 | && value_logical_not (arg2)) |
| 2222 | { |
| 2223 | struct value *v_one, *retval; |
| 2224 | |
| 2225 | v_one = value_one (value_type (arg2)); |
| 2226 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &v_one); |
| 2227 | retval = value_binop (arg1, v_one, op); |
| 2228 | return retval; |
| 2229 | } |
| 2230 | else |
| 2231 | { |
| 2232 | /* For shift and integer exponentiation operations, |
| 2233 | only promote the first argument. */ |
| 2234 | if ((op == BINOP_LSH || op == BINOP_RSH || op == BINOP_EXP) |
| 2235 | && is_integral_type (value_type (arg2))) |
| 2236 | unop_promote (exp->language_defn, exp->gdbarch, &arg1); |
| 2237 | else |
| 2238 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2239 | |
| 2240 | return value_binop (arg1, arg2, op); |
| 2241 | } |
| 2242 | } |
| 2243 | |
| 2244 | case BINOP_SUBSCRIPT: |
| 2245 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2246 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2247 | if (noside == EVAL_SKIP) |
| 2248 | return eval_skip_value (exp); |
| 2249 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2250 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2251 | else |
| 2252 | { |
| 2253 | /* If the user attempts to subscript something that is not an |
| 2254 | array or pointer type (like a plain int variable for example), |
| 2255 | then report this as an error. */ |
| 2256 | |
| 2257 | arg1 = coerce_ref (arg1); |
| 2258 | type = check_typedef (value_type (arg1)); |
| 2259 | if (TYPE_CODE (type) != TYPE_CODE_ARRAY |
| 2260 | && TYPE_CODE (type) != TYPE_CODE_PTR) |
| 2261 | { |
| 2262 | if (TYPE_NAME (type)) |
| 2263 | error (_("cannot subscript something of type `%s'"), |
| 2264 | TYPE_NAME (type)); |
| 2265 | else |
| 2266 | error (_("cannot subscript requested type")); |
| 2267 | } |
| 2268 | |
| 2269 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2270 | return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1)); |
| 2271 | else |
| 2272 | return value_subscript (arg1, value_as_long (arg2)); |
| 2273 | } |
| 2274 | case MULTI_SUBSCRIPT: |
| 2275 | (*pos) += 2; |
| 2276 | nargs = longest_to_int (exp->elts[pc + 1].longconst); |
| 2277 | arg1 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2278 | while (nargs-- > 0) |
| 2279 | { |
| 2280 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2281 | /* FIXME: EVAL_SKIP handling may not be correct. */ |
| 2282 | if (noside == EVAL_SKIP) |
| 2283 | { |
| 2284 | if (nargs > 0) |
| 2285 | continue; |
| 2286 | return eval_skip_value (exp); |
| 2287 | } |
| 2288 | /* FIXME: EVAL_AVOID_SIDE_EFFECTS handling may not be correct. */ |
| 2289 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2290 | { |
| 2291 | /* If the user attempts to subscript something that has no target |
| 2292 | type (like a plain int variable for example), then report this |
| 2293 | as an error. */ |
| 2294 | |
| 2295 | type = TYPE_TARGET_TYPE (check_typedef (value_type (arg1))); |
| 2296 | if (type != NULL) |
| 2297 | { |
| 2298 | arg1 = value_zero (type, VALUE_LVAL (arg1)); |
| 2299 | noside = EVAL_SKIP; |
| 2300 | continue; |
| 2301 | } |
| 2302 | else |
| 2303 | { |
| 2304 | error (_("cannot subscript something of type `%s'"), |
| 2305 | TYPE_NAME (value_type (arg1))); |
| 2306 | } |
| 2307 | } |
| 2308 | |
| 2309 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2310 | { |
| 2311 | arg1 = value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2312 | } |
| 2313 | else |
| 2314 | { |
| 2315 | arg1 = coerce_ref (arg1); |
| 2316 | type = check_typedef (value_type (arg1)); |
| 2317 | |
| 2318 | switch (TYPE_CODE (type)) |
| 2319 | { |
| 2320 | case TYPE_CODE_PTR: |
| 2321 | case TYPE_CODE_ARRAY: |
| 2322 | case TYPE_CODE_STRING: |
| 2323 | arg1 = value_subscript (arg1, value_as_long (arg2)); |
| 2324 | break; |
| 2325 | |
| 2326 | default: |
| 2327 | if (TYPE_NAME (type)) |
| 2328 | error (_("cannot subscript something of type `%s'"), |
| 2329 | TYPE_NAME (type)); |
| 2330 | else |
| 2331 | error (_("cannot subscript requested type")); |
| 2332 | } |
| 2333 | } |
| 2334 | } |
| 2335 | return (arg1); |
| 2336 | |
| 2337 | multi_f77_subscript: |
| 2338 | { |
| 2339 | LONGEST subscript_array[MAX_FORTRAN_DIMS]; |
| 2340 | int ndimensions = 1, i; |
| 2341 | struct value *array = arg1; |
| 2342 | |
| 2343 | if (nargs > MAX_FORTRAN_DIMS) |
| 2344 | error (_("Too many subscripts for F77 (%d Max)"), MAX_FORTRAN_DIMS); |
| 2345 | |
| 2346 | ndimensions = calc_f77_array_dims (type); |
| 2347 | |
| 2348 | if (nargs != ndimensions) |
| 2349 | error (_("Wrong number of subscripts")); |
| 2350 | |
| 2351 | gdb_assert (nargs > 0); |
| 2352 | |
| 2353 | /* Now that we know we have a legal array subscript expression |
| 2354 | let us actually find out where this element exists in the array. */ |
| 2355 | |
| 2356 | /* Take array indices left to right. */ |
| 2357 | for (i = 0; i < nargs; i++) |
| 2358 | { |
| 2359 | /* Evaluate each subscript; it must be a legal integer in F77. */ |
| 2360 | arg2 = evaluate_subexp_with_coercion (exp, pos, noside); |
| 2361 | |
| 2362 | /* Fill in the subscript array. */ |
| 2363 | |
| 2364 | subscript_array[i] = value_as_long (arg2); |
| 2365 | } |
| 2366 | |
| 2367 | /* Internal type of array is arranged right to left. */ |
| 2368 | for (i = nargs; i > 0; i--) |
| 2369 | { |
| 2370 | struct type *array_type = check_typedef (value_type (array)); |
| 2371 | LONGEST index = subscript_array[i - 1]; |
| 2372 | |
| 2373 | array = value_subscripted_rvalue (array, index, |
| 2374 | f77_get_lowerbound (array_type)); |
| 2375 | } |
| 2376 | |
| 2377 | return array; |
| 2378 | } |
| 2379 | |
| 2380 | case BINOP_LOGICAL_AND: |
| 2381 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2382 | if (noside == EVAL_SKIP) |
| 2383 | { |
| 2384 | evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2385 | return eval_skip_value (exp); |
| 2386 | } |
| 2387 | |
| 2388 | oldpos = *pos; |
| 2389 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 2390 | *pos = oldpos; |
| 2391 | |
| 2392 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2393 | { |
| 2394 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2395 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2396 | } |
| 2397 | else |
| 2398 | { |
| 2399 | tem = value_logical_not (arg1); |
| 2400 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, |
| 2401 | (tem ? EVAL_SKIP : noside)); |
| 2402 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2403 | return value_from_longest (type, |
| 2404 | (LONGEST) (!tem && !value_logical_not (arg2))); |
| 2405 | } |
| 2406 | |
| 2407 | case BINOP_LOGICAL_OR: |
| 2408 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2409 | if (noside == EVAL_SKIP) |
| 2410 | { |
| 2411 | evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2412 | return eval_skip_value (exp); |
| 2413 | } |
| 2414 | |
| 2415 | oldpos = *pos; |
| 2416 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 2417 | *pos = oldpos; |
| 2418 | |
| 2419 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2420 | { |
| 2421 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2422 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2423 | } |
| 2424 | else |
| 2425 | { |
| 2426 | tem = value_logical_not (arg1); |
| 2427 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, |
| 2428 | (!tem ? EVAL_SKIP : noside)); |
| 2429 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2430 | return value_from_longest (type, |
| 2431 | (LONGEST) (!tem || !value_logical_not (arg2))); |
| 2432 | } |
| 2433 | |
| 2434 | case BINOP_EQUAL: |
| 2435 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2436 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2437 | if (noside == EVAL_SKIP) |
| 2438 | return eval_skip_value (exp); |
| 2439 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2440 | { |
| 2441 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2442 | } |
| 2443 | else |
| 2444 | { |
| 2445 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2446 | tem = value_equal (arg1, arg2); |
| 2447 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2448 | return value_from_longest (type, (LONGEST) tem); |
| 2449 | } |
| 2450 | |
| 2451 | case BINOP_NOTEQUAL: |
| 2452 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2453 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2454 | if (noside == EVAL_SKIP) |
| 2455 | return eval_skip_value (exp); |
| 2456 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2457 | { |
| 2458 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2459 | } |
| 2460 | else |
| 2461 | { |
| 2462 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2463 | tem = value_equal (arg1, arg2); |
| 2464 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2465 | return value_from_longest (type, (LONGEST) ! tem); |
| 2466 | } |
| 2467 | |
| 2468 | case BINOP_LESS: |
| 2469 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2470 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2471 | if (noside == EVAL_SKIP) |
| 2472 | return eval_skip_value (exp); |
| 2473 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2474 | { |
| 2475 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2476 | } |
| 2477 | else |
| 2478 | { |
| 2479 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2480 | tem = value_less (arg1, arg2); |
| 2481 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2482 | return value_from_longest (type, (LONGEST) tem); |
| 2483 | } |
| 2484 | |
| 2485 | case BINOP_GTR: |
| 2486 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2487 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2488 | if (noside == EVAL_SKIP) |
| 2489 | return eval_skip_value (exp); |
| 2490 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2491 | { |
| 2492 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2493 | } |
| 2494 | else |
| 2495 | { |
| 2496 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2497 | tem = value_less (arg2, arg1); |
| 2498 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2499 | return value_from_longest (type, (LONGEST) tem); |
| 2500 | } |
| 2501 | |
| 2502 | case BINOP_GEQ: |
| 2503 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2504 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2505 | if (noside == EVAL_SKIP) |
| 2506 | return eval_skip_value (exp); |
| 2507 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2508 | { |
| 2509 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2510 | } |
| 2511 | else |
| 2512 | { |
| 2513 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2514 | tem = value_less (arg2, arg1) || value_equal (arg1, arg2); |
| 2515 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2516 | return value_from_longest (type, (LONGEST) tem); |
| 2517 | } |
| 2518 | |
| 2519 | case BINOP_LEQ: |
| 2520 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2521 | arg2 = evaluate_subexp (value_type (arg1), exp, pos, noside); |
| 2522 | if (noside == EVAL_SKIP) |
| 2523 | return eval_skip_value (exp); |
| 2524 | if (binop_user_defined_p (op, arg1, arg2)) |
| 2525 | { |
| 2526 | return value_x_binop (arg1, arg2, op, OP_NULL, noside); |
| 2527 | } |
| 2528 | else |
| 2529 | { |
| 2530 | binop_promote (exp->language_defn, exp->gdbarch, &arg1, &arg2); |
| 2531 | tem = value_less (arg1, arg2) || value_equal (arg1, arg2); |
| 2532 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2533 | return value_from_longest (type, (LONGEST) tem); |
| 2534 | } |
| 2535 | |
| 2536 | case BINOP_REPEAT: |
| 2537 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2538 | arg2 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2539 | if (noside == EVAL_SKIP) |
| 2540 | return eval_skip_value (exp); |
| 2541 | type = check_typedef (value_type (arg2)); |
| 2542 | if (TYPE_CODE (type) != TYPE_CODE_INT |
| 2543 | && TYPE_CODE (type) != TYPE_CODE_ENUM) |
| 2544 | error (_("Non-integral right operand for \"@\" operator.")); |
| 2545 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2546 | { |
| 2547 | return allocate_repeat_value (value_type (arg1), |
| 2548 | longest_to_int (value_as_long (arg2))); |
| 2549 | } |
| 2550 | else |
| 2551 | return value_repeat (arg1, longest_to_int (value_as_long (arg2))); |
| 2552 | |
| 2553 | case BINOP_COMMA: |
| 2554 | evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2555 | return evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2556 | |
| 2557 | case UNOP_PLUS: |
| 2558 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2559 | if (noside == EVAL_SKIP) |
| 2560 | return eval_skip_value (exp); |
| 2561 | if (unop_user_defined_p (op, arg1)) |
| 2562 | return value_x_unop (arg1, op, noside); |
| 2563 | else |
| 2564 | { |
| 2565 | unop_promote (exp->language_defn, exp->gdbarch, &arg1); |
| 2566 | return value_pos (arg1); |
| 2567 | } |
| 2568 | |
| 2569 | case UNOP_NEG: |
| 2570 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2571 | if (noside == EVAL_SKIP) |
| 2572 | return eval_skip_value (exp); |
| 2573 | if (unop_user_defined_p (op, arg1)) |
| 2574 | return value_x_unop (arg1, op, noside); |
| 2575 | else |
| 2576 | { |
| 2577 | unop_promote (exp->language_defn, exp->gdbarch, &arg1); |
| 2578 | return value_neg (arg1); |
| 2579 | } |
| 2580 | |
| 2581 | case UNOP_COMPLEMENT: |
| 2582 | /* C++: check for and handle destructor names. */ |
| 2583 | |
| 2584 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2585 | if (noside == EVAL_SKIP) |
| 2586 | return eval_skip_value (exp); |
| 2587 | if (unop_user_defined_p (UNOP_COMPLEMENT, arg1)) |
| 2588 | return value_x_unop (arg1, UNOP_COMPLEMENT, noside); |
| 2589 | else |
| 2590 | { |
| 2591 | unop_promote (exp->language_defn, exp->gdbarch, &arg1); |
| 2592 | return value_complement (arg1); |
| 2593 | } |
| 2594 | |
| 2595 | case UNOP_LOGICAL_NOT: |
| 2596 | arg1 = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2597 | if (noside == EVAL_SKIP) |
| 2598 | return eval_skip_value (exp); |
| 2599 | if (unop_user_defined_p (op, arg1)) |
| 2600 | return value_x_unop (arg1, op, noside); |
| 2601 | else |
| 2602 | { |
| 2603 | type = language_bool_type (exp->language_defn, exp->gdbarch); |
| 2604 | return value_from_longest (type, (LONGEST) value_logical_not (arg1)); |
| 2605 | } |
| 2606 | |
| 2607 | case UNOP_IND: |
| 2608 | if (expect_type && TYPE_CODE (expect_type) == TYPE_CODE_PTR) |
| 2609 | expect_type = TYPE_TARGET_TYPE (check_typedef (expect_type)); |
| 2610 | arg1 = evaluate_subexp (expect_type, exp, pos, noside); |
| 2611 | type = check_typedef (value_type (arg1)); |
| 2612 | if (TYPE_CODE (type) == TYPE_CODE_METHODPTR |
| 2613 | || TYPE_CODE (type) == TYPE_CODE_MEMBERPTR) |
| 2614 | error (_("Attempt to dereference pointer " |
| 2615 | "to member without an object")); |
| 2616 | if (noside == EVAL_SKIP) |
| 2617 | return eval_skip_value (exp); |
| 2618 | if (unop_user_defined_p (op, arg1)) |
| 2619 | return value_x_unop (arg1, op, noside); |
| 2620 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2621 | { |
| 2622 | type = check_typedef (value_type (arg1)); |
| 2623 | if (TYPE_CODE (type) == TYPE_CODE_PTR |
| 2624 | || TYPE_IS_REFERENCE (type) |
| 2625 | /* In C you can dereference an array to get the 1st elt. */ |
| 2626 | || TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 2627 | ) |
| 2628 | return value_zero (TYPE_TARGET_TYPE (type), |
| 2629 | lval_memory); |
| 2630 | else if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 2631 | /* GDB allows dereferencing an int. */ |
| 2632 | return value_zero (builtin_type (exp->gdbarch)->builtin_int, |
| 2633 | lval_memory); |
| 2634 | else |
| 2635 | error (_("Attempt to take contents of a non-pointer value.")); |
| 2636 | } |
| 2637 | |
| 2638 | /* Allow * on an integer so we can cast it to whatever we want. |
| 2639 | This returns an int, which seems like the most C-like thing to |
| 2640 | do. "long long" variables are rare enough that |
| 2641 | BUILTIN_TYPE_LONGEST would seem to be a mistake. */ |
| 2642 | if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 2643 | return value_at_lazy (builtin_type (exp->gdbarch)->builtin_int, |
| 2644 | (CORE_ADDR) value_as_address (arg1)); |
| 2645 | return value_ind (arg1); |
| 2646 | |
| 2647 | case UNOP_ADDR: |
| 2648 | /* C++: check for and handle pointer to members. */ |
| 2649 | |
| 2650 | if (noside == EVAL_SKIP) |
| 2651 | { |
| 2652 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 2653 | return eval_skip_value (exp); |
| 2654 | } |
| 2655 | else |
| 2656 | { |
| 2657 | struct value *retvalp = evaluate_subexp_for_address (exp, pos, |
| 2658 | noside); |
| 2659 | |
| 2660 | return retvalp; |
| 2661 | } |
| 2662 | |
| 2663 | case UNOP_SIZEOF: |
| 2664 | if (noside == EVAL_SKIP) |
| 2665 | { |
| 2666 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 2667 | return eval_skip_value (exp); |
| 2668 | } |
| 2669 | return evaluate_subexp_for_sizeof (exp, pos, noside); |
| 2670 | |
| 2671 | case UNOP_ALIGNOF: |
| 2672 | { |
| 2673 | struct type *type |
| 2674 | = value_type (evaluate_subexp (NULL_TYPE, exp, pos, |
| 2675 | EVAL_AVOID_SIDE_EFFECTS)); |
| 2676 | /* FIXME: This should be size_t. */ |
| 2677 | struct type *size_type = builtin_type (exp->gdbarch)->builtin_int; |
| 2678 | ULONGEST align = type_align (type); |
| 2679 | if (align == 0) |
| 2680 | error (_("could not determine alignment of type")); |
| 2681 | return value_from_longest (size_type, align); |
| 2682 | } |
| 2683 | |
| 2684 | case UNOP_CAST: |
| 2685 | (*pos) += 2; |
| 2686 | type = exp->elts[pc + 1].type; |
| 2687 | return evaluate_subexp_for_cast (exp, pos, noside, type); |
| 2688 | |
| 2689 | case UNOP_CAST_TYPE: |
| 2690 | arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 2691 | type = value_type (arg1); |
| 2692 | return evaluate_subexp_for_cast (exp, pos, noside, type); |
| 2693 | |
| 2694 | case UNOP_DYNAMIC_CAST: |
| 2695 | arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 2696 | type = value_type (arg1); |
| 2697 | arg1 = evaluate_subexp (type, exp, pos, noside); |
| 2698 | if (noside == EVAL_SKIP) |
| 2699 | return eval_skip_value (exp); |
| 2700 | return value_dynamic_cast (type, arg1); |
| 2701 | |
| 2702 | case UNOP_REINTERPRET_CAST: |
| 2703 | arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 2704 | type = value_type (arg1); |
| 2705 | arg1 = evaluate_subexp (type, exp, pos, noside); |
| 2706 | if (noside == EVAL_SKIP) |
| 2707 | return eval_skip_value (exp); |
| 2708 | return value_reinterpret_cast (type, arg1); |
| 2709 | |
| 2710 | case UNOP_MEMVAL: |
| 2711 | (*pos) += 2; |
| 2712 | arg1 = evaluate_subexp (expect_type, exp, pos, noside); |
| 2713 | if (noside == EVAL_SKIP) |
| 2714 | return eval_skip_value (exp); |
| 2715 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2716 | return value_zero (exp->elts[pc + 1].type, lval_memory); |
| 2717 | else |
| 2718 | return value_at_lazy (exp->elts[pc + 1].type, |
| 2719 | value_as_address (arg1)); |
| 2720 | |
| 2721 | case UNOP_MEMVAL_TYPE: |
| 2722 | arg1 = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 2723 | type = value_type (arg1); |
| 2724 | arg1 = evaluate_subexp (expect_type, exp, pos, noside); |
| 2725 | if (noside == EVAL_SKIP) |
| 2726 | return eval_skip_value (exp); |
| 2727 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2728 | return value_zero (type, lval_memory); |
| 2729 | else |
| 2730 | return value_at_lazy (type, value_as_address (arg1)); |
| 2731 | |
| 2732 | case UNOP_PREINCREMENT: |
| 2733 | arg1 = evaluate_subexp (expect_type, exp, pos, noside); |
| 2734 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2735 | return arg1; |
| 2736 | else if (unop_user_defined_p (op, arg1)) |
| 2737 | { |
| 2738 | return value_x_unop (arg1, op, noside); |
| 2739 | } |
| 2740 | else |
| 2741 | { |
| 2742 | if (ptrmath_type_p (exp->language_defn, value_type (arg1))) |
| 2743 | arg2 = value_ptradd (arg1, 1); |
| 2744 | else |
| 2745 | { |
| 2746 | struct value *tmp = arg1; |
| 2747 | |
| 2748 | arg2 = value_one (value_type (arg1)); |
| 2749 | binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2); |
| 2750 | arg2 = value_binop (tmp, arg2, BINOP_ADD); |
| 2751 | } |
| 2752 | |
| 2753 | return value_assign (arg1, arg2); |
| 2754 | } |
| 2755 | |
| 2756 | case UNOP_PREDECREMENT: |
| 2757 | arg1 = evaluate_subexp (expect_type, exp, pos, noside); |
| 2758 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2759 | return arg1; |
| 2760 | else if (unop_user_defined_p (op, arg1)) |
| 2761 | { |
| 2762 | return value_x_unop (arg1, op, noside); |
| 2763 | } |
| 2764 | else |
| 2765 | { |
| 2766 | if (ptrmath_type_p (exp->language_defn, value_type (arg1))) |
| 2767 | arg2 = value_ptradd (arg1, -1); |
| 2768 | else |
| 2769 | { |
| 2770 | struct value *tmp = arg1; |
| 2771 | |
| 2772 | arg2 = value_one (value_type (arg1)); |
| 2773 | binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2); |
| 2774 | arg2 = value_binop (tmp, arg2, BINOP_SUB); |
| 2775 | } |
| 2776 | |
| 2777 | return value_assign (arg1, arg2); |
| 2778 | } |
| 2779 | |
| 2780 | case UNOP_POSTINCREMENT: |
| 2781 | arg1 = evaluate_subexp (expect_type, exp, pos, noside); |
| 2782 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2783 | return arg1; |
| 2784 | else if (unop_user_defined_p (op, arg1)) |
| 2785 | { |
| 2786 | return value_x_unop (arg1, op, noside); |
| 2787 | } |
| 2788 | else |
| 2789 | { |
| 2790 | arg3 = value_non_lval (arg1); |
| 2791 | |
| 2792 | if (ptrmath_type_p (exp->language_defn, value_type (arg1))) |
| 2793 | arg2 = value_ptradd (arg1, 1); |
| 2794 | else |
| 2795 | { |
| 2796 | struct value *tmp = arg1; |
| 2797 | |
| 2798 | arg2 = value_one (value_type (arg1)); |
| 2799 | binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2); |
| 2800 | arg2 = value_binop (tmp, arg2, BINOP_ADD); |
| 2801 | } |
| 2802 | |
| 2803 | value_assign (arg1, arg2); |
| 2804 | return arg3; |
| 2805 | } |
| 2806 | |
| 2807 | case UNOP_POSTDECREMENT: |
| 2808 | arg1 = evaluate_subexp (expect_type, exp, pos, noside); |
| 2809 | if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2810 | return arg1; |
| 2811 | else if (unop_user_defined_p (op, arg1)) |
| 2812 | { |
| 2813 | return value_x_unop (arg1, op, noside); |
| 2814 | } |
| 2815 | else |
| 2816 | { |
| 2817 | arg3 = value_non_lval (arg1); |
| 2818 | |
| 2819 | if (ptrmath_type_p (exp->language_defn, value_type (arg1))) |
| 2820 | arg2 = value_ptradd (arg1, -1); |
| 2821 | else |
| 2822 | { |
| 2823 | struct value *tmp = arg1; |
| 2824 | |
| 2825 | arg2 = value_one (value_type (arg1)); |
| 2826 | binop_promote (exp->language_defn, exp->gdbarch, &tmp, &arg2); |
| 2827 | arg2 = value_binop (tmp, arg2, BINOP_SUB); |
| 2828 | } |
| 2829 | |
| 2830 | value_assign (arg1, arg2); |
| 2831 | return arg3; |
| 2832 | } |
| 2833 | |
| 2834 | case OP_THIS: |
| 2835 | (*pos) += 1; |
| 2836 | return value_of_this (exp->language_defn); |
| 2837 | |
| 2838 | case OP_TYPE: |
| 2839 | /* The value is not supposed to be used. This is here to make it |
| 2840 | easier to accommodate expressions that contain types. */ |
| 2841 | (*pos) += 2; |
| 2842 | if (noside == EVAL_SKIP) |
| 2843 | return eval_skip_value (exp); |
| 2844 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2845 | return allocate_value (exp->elts[pc + 1].type); |
| 2846 | else |
| 2847 | error (_("Attempt to use a type name as an expression")); |
| 2848 | |
| 2849 | case OP_TYPEOF: |
| 2850 | case OP_DECLTYPE: |
| 2851 | if (noside == EVAL_SKIP) |
| 2852 | { |
| 2853 | evaluate_subexp (NULL_TYPE, exp, pos, EVAL_SKIP); |
| 2854 | return eval_skip_value (exp); |
| 2855 | } |
| 2856 | else if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2857 | { |
| 2858 | enum exp_opcode sub_op = exp->elts[*pos].opcode; |
| 2859 | struct value *result; |
| 2860 | |
| 2861 | result = evaluate_subexp (NULL_TYPE, exp, pos, |
| 2862 | EVAL_AVOID_SIDE_EFFECTS); |
| 2863 | |
| 2864 | /* 'decltype' has special semantics for lvalues. */ |
| 2865 | if (op == OP_DECLTYPE |
| 2866 | && (sub_op == BINOP_SUBSCRIPT |
| 2867 | || sub_op == STRUCTOP_MEMBER |
| 2868 | || sub_op == STRUCTOP_MPTR |
| 2869 | || sub_op == UNOP_IND |
| 2870 | || sub_op == STRUCTOP_STRUCT |
| 2871 | || sub_op == STRUCTOP_PTR |
| 2872 | || sub_op == OP_SCOPE)) |
| 2873 | { |
| 2874 | struct type *type = value_type (result); |
| 2875 | |
| 2876 | if (!TYPE_IS_REFERENCE (type)) |
| 2877 | { |
| 2878 | type = lookup_lvalue_reference_type (type); |
| 2879 | result = allocate_value (type); |
| 2880 | } |
| 2881 | } |
| 2882 | |
| 2883 | return result; |
| 2884 | } |
| 2885 | else |
| 2886 | error (_("Attempt to use a type as an expression")); |
| 2887 | |
| 2888 | case OP_TYPEID: |
| 2889 | { |
| 2890 | struct value *result; |
| 2891 | enum exp_opcode sub_op = exp->elts[*pos].opcode; |
| 2892 | |
| 2893 | if (sub_op == OP_TYPE || sub_op == OP_DECLTYPE || sub_op == OP_TYPEOF) |
| 2894 | result = evaluate_subexp (NULL_TYPE, exp, pos, |
| 2895 | EVAL_AVOID_SIDE_EFFECTS); |
| 2896 | else |
| 2897 | result = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2898 | |
| 2899 | if (noside != EVAL_NORMAL) |
| 2900 | return allocate_value (cplus_typeid_type (exp->gdbarch)); |
| 2901 | |
| 2902 | return cplus_typeid (result); |
| 2903 | } |
| 2904 | |
| 2905 | default: |
| 2906 | /* Removing this case and compiling with gcc -Wall reveals that |
| 2907 | a lot of cases are hitting this case. Some of these should |
| 2908 | probably be removed from expression.h; others are legitimate |
| 2909 | expressions which are (apparently) not fully implemented. |
| 2910 | |
| 2911 | If there are any cases landing here which mean a user error, |
| 2912 | then they should be separate cases, with more descriptive |
| 2913 | error messages. */ |
| 2914 | |
| 2915 | error (_("GDB does not (yet) know how to " |
| 2916 | "evaluate that kind of expression")); |
| 2917 | } |
| 2918 | |
| 2919 | gdb_assert_not_reached ("missed return?"); |
| 2920 | } |
| 2921 | \f |
| 2922 | /* Evaluate a subexpression of EXP, at index *POS, |
| 2923 | and return the address of that subexpression. |
| 2924 | Advance *POS over the subexpression. |
| 2925 | If the subexpression isn't an lvalue, get an error. |
| 2926 | NOSIDE may be EVAL_AVOID_SIDE_EFFECTS; |
| 2927 | then only the type of the result need be correct. */ |
| 2928 | |
| 2929 | static struct value * |
| 2930 | evaluate_subexp_for_address (struct expression *exp, int *pos, |
| 2931 | enum noside noside) |
| 2932 | { |
| 2933 | enum exp_opcode op; |
| 2934 | int pc; |
| 2935 | struct symbol *var; |
| 2936 | struct value *x; |
| 2937 | int tem; |
| 2938 | |
| 2939 | pc = (*pos); |
| 2940 | op = exp->elts[pc].opcode; |
| 2941 | |
| 2942 | switch (op) |
| 2943 | { |
| 2944 | case UNOP_IND: |
| 2945 | (*pos)++; |
| 2946 | x = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 2947 | |
| 2948 | /* We can't optimize out "&*" if there's a user-defined operator*. */ |
| 2949 | if (unop_user_defined_p (op, x)) |
| 2950 | { |
| 2951 | x = value_x_unop (x, op, noside); |
| 2952 | goto default_case_after_eval; |
| 2953 | } |
| 2954 | |
| 2955 | return coerce_array (x); |
| 2956 | |
| 2957 | case UNOP_MEMVAL: |
| 2958 | (*pos) += 3; |
| 2959 | return value_cast (lookup_pointer_type (exp->elts[pc + 1].type), |
| 2960 | evaluate_subexp (NULL_TYPE, exp, pos, noside)); |
| 2961 | |
| 2962 | case UNOP_MEMVAL_TYPE: |
| 2963 | { |
| 2964 | struct type *type; |
| 2965 | |
| 2966 | (*pos) += 1; |
| 2967 | x = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 2968 | type = value_type (x); |
| 2969 | return value_cast (lookup_pointer_type (type), |
| 2970 | evaluate_subexp (NULL_TYPE, exp, pos, noside)); |
| 2971 | } |
| 2972 | |
| 2973 | case OP_VAR_VALUE: |
| 2974 | var = exp->elts[pc + 2].symbol; |
| 2975 | |
| 2976 | /* C++: The "address" of a reference should yield the address |
| 2977 | * of the object pointed to. Let value_addr() deal with it. */ |
| 2978 | if (TYPE_IS_REFERENCE (SYMBOL_TYPE (var))) |
| 2979 | goto default_case; |
| 2980 | |
| 2981 | (*pos) += 4; |
| 2982 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 2983 | { |
| 2984 | struct type *type = |
| 2985 | lookup_pointer_type (SYMBOL_TYPE (var)); |
| 2986 | enum address_class sym_class = SYMBOL_CLASS (var); |
| 2987 | |
| 2988 | if (sym_class == LOC_CONST |
| 2989 | || sym_class == LOC_CONST_BYTES |
| 2990 | || sym_class == LOC_REGISTER) |
| 2991 | error (_("Attempt to take address of register or constant.")); |
| 2992 | |
| 2993 | return |
| 2994 | value_zero (type, not_lval); |
| 2995 | } |
| 2996 | else |
| 2997 | return address_of_variable (var, exp->elts[pc + 1].block); |
| 2998 | |
| 2999 | case OP_VAR_MSYM_VALUE: |
| 3000 | { |
| 3001 | (*pos) += 4; |
| 3002 | |
| 3003 | value *val = evaluate_var_msym_value (noside, |
| 3004 | exp->elts[pc + 1].objfile, |
| 3005 | exp->elts[pc + 2].msymbol); |
| 3006 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 3007 | { |
| 3008 | struct type *type = lookup_pointer_type (value_type (val)); |
| 3009 | return value_zero (type, not_lval); |
| 3010 | } |
| 3011 | else |
| 3012 | return value_addr (val); |
| 3013 | } |
| 3014 | |
| 3015 | case OP_SCOPE: |
| 3016 | tem = longest_to_int (exp->elts[pc + 2].longconst); |
| 3017 | (*pos) += 5 + BYTES_TO_EXP_ELEM (tem + 1); |
| 3018 | x = value_aggregate_elt (exp->elts[pc + 1].type, |
| 3019 | &exp->elts[pc + 3].string, |
| 3020 | NULL, 1, noside); |
| 3021 | if (x == NULL) |
| 3022 | error (_("There is no field named %s"), &exp->elts[pc + 3].string); |
| 3023 | return x; |
| 3024 | |
| 3025 | default: |
| 3026 | default_case: |
| 3027 | x = evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 3028 | default_case_after_eval: |
| 3029 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 3030 | { |
| 3031 | struct type *type = check_typedef (value_type (x)); |
| 3032 | |
| 3033 | if (TYPE_IS_REFERENCE (type)) |
| 3034 | return value_zero (lookup_pointer_type (TYPE_TARGET_TYPE (type)), |
| 3035 | not_lval); |
| 3036 | else if (VALUE_LVAL (x) == lval_memory || value_must_coerce_to_target (x)) |
| 3037 | return value_zero (lookup_pointer_type (value_type (x)), |
| 3038 | not_lval); |
| 3039 | else |
| 3040 | error (_("Attempt to take address of " |
| 3041 | "value not located in memory.")); |
| 3042 | } |
| 3043 | return value_addr (x); |
| 3044 | } |
| 3045 | } |
| 3046 | |
| 3047 | /* Evaluate like `evaluate_subexp' except coercing arrays to pointers. |
| 3048 | When used in contexts where arrays will be coerced anyway, this is |
| 3049 | equivalent to `evaluate_subexp' but much faster because it avoids |
| 3050 | actually fetching array contents (perhaps obsolete now that we have |
| 3051 | value_lazy()). |
| 3052 | |
| 3053 | Note that we currently only do the coercion for C expressions, where |
| 3054 | arrays are zero based and the coercion is correct. For other languages, |
| 3055 | with nonzero based arrays, coercion loses. Use CAST_IS_CONVERSION |
| 3056 | to decide if coercion is appropriate. */ |
| 3057 | |
| 3058 | struct value * |
| 3059 | evaluate_subexp_with_coercion (struct expression *exp, |
| 3060 | int *pos, enum noside noside) |
| 3061 | { |
| 3062 | enum exp_opcode op; |
| 3063 | int pc; |
| 3064 | struct value *val; |
| 3065 | struct symbol *var; |
| 3066 | struct type *type; |
| 3067 | |
| 3068 | pc = (*pos); |
| 3069 | op = exp->elts[pc].opcode; |
| 3070 | |
| 3071 | switch (op) |
| 3072 | { |
| 3073 | case OP_VAR_VALUE: |
| 3074 | var = exp->elts[pc + 2].symbol; |
| 3075 | type = check_typedef (SYMBOL_TYPE (var)); |
| 3076 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 3077 | && !TYPE_VECTOR (type) |
| 3078 | && CAST_IS_CONVERSION (exp->language_defn)) |
| 3079 | { |
| 3080 | (*pos) += 4; |
| 3081 | val = address_of_variable (var, exp->elts[pc + 1].block); |
| 3082 | return value_cast (lookup_pointer_type (TYPE_TARGET_TYPE (type)), |
| 3083 | val); |
| 3084 | } |
| 3085 | /* FALLTHROUGH */ |
| 3086 | |
| 3087 | default: |
| 3088 | return evaluate_subexp (NULL_TYPE, exp, pos, noside); |
| 3089 | } |
| 3090 | } |
| 3091 | |
| 3092 | /* Evaluate a subexpression of EXP, at index *POS, |
| 3093 | and return a value for the size of that subexpression. |
| 3094 | Advance *POS over the subexpression. If NOSIDE is EVAL_NORMAL |
| 3095 | we allow side-effects on the operand if its type is a variable |
| 3096 | length array. */ |
| 3097 | |
| 3098 | static struct value * |
| 3099 | evaluate_subexp_for_sizeof (struct expression *exp, int *pos, |
| 3100 | enum noside noside) |
| 3101 | { |
| 3102 | /* FIXME: This should be size_t. */ |
| 3103 | struct type *size_type = builtin_type (exp->gdbarch)->builtin_int; |
| 3104 | enum exp_opcode op; |
| 3105 | int pc; |
| 3106 | struct type *type; |
| 3107 | struct value *val; |
| 3108 | |
| 3109 | pc = (*pos); |
| 3110 | op = exp->elts[pc].opcode; |
| 3111 | |
| 3112 | switch (op) |
| 3113 | { |
| 3114 | /* This case is handled specially |
| 3115 | so that we avoid creating a value for the result type. |
| 3116 | If the result type is very big, it's desirable not to |
| 3117 | create a value unnecessarily. */ |
| 3118 | case UNOP_IND: |
| 3119 | (*pos)++; |
| 3120 | val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 3121 | type = check_typedef (value_type (val)); |
| 3122 | if (TYPE_CODE (type) != TYPE_CODE_PTR |
| 3123 | && !TYPE_IS_REFERENCE (type) |
| 3124 | && TYPE_CODE (type) != TYPE_CODE_ARRAY) |
| 3125 | error (_("Attempt to take contents of a non-pointer value.")); |
| 3126 | type = TYPE_TARGET_TYPE (type); |
| 3127 | if (is_dynamic_type (type)) |
| 3128 | type = value_type (value_ind (val)); |
| 3129 | return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type)); |
| 3130 | |
| 3131 | case UNOP_MEMVAL: |
| 3132 | (*pos) += 3; |
| 3133 | type = exp->elts[pc + 1].type; |
| 3134 | break; |
| 3135 | |
| 3136 | case UNOP_MEMVAL_TYPE: |
| 3137 | (*pos) += 1; |
| 3138 | val = evaluate_subexp (NULL, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 3139 | type = value_type (val); |
| 3140 | break; |
| 3141 | |
| 3142 | case OP_VAR_VALUE: |
| 3143 | type = SYMBOL_TYPE (exp->elts[pc + 2].symbol); |
| 3144 | if (is_dynamic_type (type)) |
| 3145 | { |
| 3146 | val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL); |
| 3147 | type = value_type (val); |
| 3148 | } |
| 3149 | else |
| 3150 | (*pos) += 4; |
| 3151 | break; |
| 3152 | |
| 3153 | case OP_VAR_MSYM_VALUE: |
| 3154 | { |
| 3155 | (*pos) += 4; |
| 3156 | |
| 3157 | minimal_symbol *msymbol = exp->elts[pc + 2].msymbol; |
| 3158 | value *val = evaluate_var_msym_value (noside, |
| 3159 | exp->elts[pc + 1].objfile, |
| 3160 | msymbol); |
| 3161 | |
| 3162 | type = value_type (val); |
| 3163 | if (TYPE_CODE (type) == TYPE_CODE_ERROR) |
| 3164 | error_unknown_type (MSYMBOL_PRINT_NAME (msymbol)); |
| 3165 | |
| 3166 | return value_from_longest (size_type, TYPE_LENGTH (type)); |
| 3167 | } |
| 3168 | break; |
| 3169 | |
| 3170 | /* Deal with the special case if NOSIDE is EVAL_NORMAL and the resulting |
| 3171 | type of the subscript is a variable length array type. In this case we |
| 3172 | must re-evaluate the right hand side of the subcription to allow |
| 3173 | side-effects. */ |
| 3174 | case BINOP_SUBSCRIPT: |
| 3175 | if (noside == EVAL_NORMAL) |
| 3176 | { |
| 3177 | int pc = (*pos) + 1; |
| 3178 | |
| 3179 | val = evaluate_subexp (NULL_TYPE, exp, &pc, EVAL_AVOID_SIDE_EFFECTS); |
| 3180 | type = check_typedef (value_type (val)); |
| 3181 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 3182 | { |
| 3183 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 3184 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 3185 | { |
| 3186 | type = TYPE_INDEX_TYPE (type); |
| 3187 | /* Only re-evaluate the right hand side if the resulting type |
| 3188 | is a variable length type. */ |
| 3189 | if (TYPE_RANGE_DATA (type)->flag_bound_evaluated) |
| 3190 | { |
| 3191 | val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_NORMAL); |
| 3192 | return value_from_longest |
| 3193 | (size_type, (LONGEST) TYPE_LENGTH (value_type (val))); |
| 3194 | } |
| 3195 | } |
| 3196 | } |
| 3197 | } |
| 3198 | |
| 3199 | /* Fall through. */ |
| 3200 | |
| 3201 | default: |
| 3202 | val = evaluate_subexp (NULL_TYPE, exp, pos, EVAL_AVOID_SIDE_EFFECTS); |
| 3203 | type = value_type (val); |
| 3204 | break; |
| 3205 | } |
| 3206 | |
| 3207 | /* $5.3.3/2 of the C++ Standard (n3290 draft) says of sizeof: |
| 3208 | "When applied to a reference or a reference type, the result is |
| 3209 | the size of the referenced type." */ |
| 3210 | type = check_typedef (type); |
| 3211 | if (exp->language_defn->la_language == language_cplus |
| 3212 | && (TYPE_IS_REFERENCE (type))) |
| 3213 | type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 3214 | return value_from_longest (size_type, (LONGEST) TYPE_LENGTH (type)); |
| 3215 | } |
| 3216 | |
| 3217 | /* Evaluate a subexpression of EXP, at index *POS, and return a value |
| 3218 | for that subexpression cast to TO_TYPE. Advance *POS over the |
| 3219 | subexpression. */ |
| 3220 | |
| 3221 | static value * |
| 3222 | evaluate_subexp_for_cast (expression *exp, int *pos, |
| 3223 | enum noside noside, |
| 3224 | struct type *to_type) |
| 3225 | { |
| 3226 | int pc = *pos; |
| 3227 | |
| 3228 | /* Don't let symbols be evaluated with evaluate_subexp because that |
| 3229 | throws an "unknown type" error for no-debug data symbols. |
| 3230 | Instead, we want the cast to reinterpret the symbol. */ |
| 3231 | if (exp->elts[pc].opcode == OP_VAR_MSYM_VALUE |
| 3232 | || exp->elts[pc].opcode == OP_VAR_VALUE) |
| 3233 | { |
| 3234 | (*pos) += 4; |
| 3235 | |
| 3236 | value *val; |
| 3237 | if (exp->elts[pc].opcode == OP_VAR_MSYM_VALUE) |
| 3238 | { |
| 3239 | if (noside == EVAL_AVOID_SIDE_EFFECTS) |
| 3240 | return value_zero (to_type, not_lval); |
| 3241 | |
| 3242 | val = evaluate_var_msym_value (noside, |
| 3243 | exp->elts[pc + 1].objfile, |
| 3244 | exp->elts[pc + 2].msymbol); |
| 3245 | } |
| 3246 | else |
| 3247 | val = evaluate_var_value (noside, |
| 3248 | exp->elts[pc + 1].block, |
| 3249 | exp->elts[pc + 2].symbol); |
| 3250 | |
| 3251 | if (noside == EVAL_SKIP) |
| 3252 | return eval_skip_value (exp); |
| 3253 | |
| 3254 | val = value_cast (to_type, val); |
| 3255 | |
| 3256 | /* Don't allow e.g. '&(int)var_with_no_debug_info'. */ |
| 3257 | if (VALUE_LVAL (val) == lval_memory) |
| 3258 | { |
| 3259 | if (value_lazy (val)) |
| 3260 | value_fetch_lazy (val); |
| 3261 | VALUE_LVAL (val) = not_lval; |
| 3262 | } |
| 3263 | return val; |
| 3264 | } |
| 3265 | |
| 3266 | value *val = evaluate_subexp (to_type, exp, pos, noside); |
| 3267 | if (noside == EVAL_SKIP) |
| 3268 | return eval_skip_value (exp); |
| 3269 | return value_cast (to_type, val); |
| 3270 | } |
| 3271 | |
| 3272 | /* Parse a type expression in the string [P..P+LENGTH). */ |
| 3273 | |
| 3274 | struct type * |
| 3275 | parse_and_eval_type (char *p, int length) |
| 3276 | { |
| 3277 | char *tmp = (char *) alloca (length + 4); |
| 3278 | |
| 3279 | tmp[0] = '('; |
| 3280 | memcpy (tmp + 1, p, length); |
| 3281 | tmp[length + 1] = ')'; |
| 3282 | tmp[length + 2] = '0'; |
| 3283 | tmp[length + 3] = '\0'; |
| 3284 | expression_up expr = parse_expression (tmp); |
| 3285 | if (expr->elts[0].opcode != UNOP_CAST) |
| 3286 | error (_("Internal error in eval_type.")); |
| 3287 | return expr->elts[1].type; |
| 3288 | } |
| 3289 | |
| 3290 | int |
| 3291 | calc_f77_array_dims (struct type *array_type) |
| 3292 | { |
| 3293 | int ndimen = 1; |
| 3294 | struct type *tmp_type; |
| 3295 | |
| 3296 | if ((TYPE_CODE (array_type) != TYPE_CODE_ARRAY)) |
| 3297 | error (_("Can't get dimensions for a non-array type")); |
| 3298 | |
| 3299 | tmp_type = array_type; |
| 3300 | |
| 3301 | while ((tmp_type = TYPE_TARGET_TYPE (tmp_type))) |
| 3302 | { |
| 3303 | if (TYPE_CODE (tmp_type) == TYPE_CODE_ARRAY) |
| 3304 | ++ndimen; |
| 3305 | } |
| 3306 | return ndimen; |
| 3307 | } |